Liquid heater without base

Abstract

The present invention discloses a baseless liquid heater, comprising a cup body, a heating plate, a temperature control switch, a heating tube, a bottom shell and an electric connector are arranged at the lower part of the cup body, the temperature control switch and the heating tube are fixed at the lower end of the heating plate, the temperature control switch is arranged at the center of the heating plate, the heating tube is arc-shaped and arranged around the temperature control switch, the temperature control switch comprises an on-off assembly, the on-off assembly comprises a thermal spring connected to the heating plate and a moving contact piece and a static contact piece that cooperate with the thermal spring piece for on-off, the electric connector is connected and fixed with the shell and is located on one side of the temperature control switch. The present invention is a baseless liquid heater with simple structure, convenient assembly and compact size.

Description

Technical Field

[0001] The invention relates to a liquid heater without a base. Background Art

[0002] At present, liquid heaters on the market, such as electric kettles and some household small appliances with liquid heating functions, such as wall-breaking machines, soybean milk machines, juicers, etc., generally include a cup body and a base. The lower part of the cup body is provided with a heating plate, a heating tube, a sudden jump thermostat, a fusible fuse, an upper coupler and other components, and the base is provided with a lower coupler. When the upper coupler and the lower coupler between the cup body and the base are coupled, the current and signal transmission between the cup body and the base can be realized. However, in recent years, with the improvement of people's quality of life, people are increasingly favoring white small appliances that are smaller and more convenient to carry. Some liquid heaters in the prior art cancel the setting of the base and directly use the power cord to connect with the cup body socket to connect, which greatly reduces the size of such appliances. However, as mentioned above, the conventional cup body has many components arranged at its lower part, such as the sudden jump thermostat, the fusible fuse, the heating tube and other components, which must be connected by wire wiring during installation. Not only is the wiring complicated and inconvenient, but also the spatial layout requirements are high, occupying a lot of space, limiting the miniaturization and portability of these appliances. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a baseless liquid heater which has a simple structure, is easy to assemble and has a compact size.

[0004] To achieve the above-mentioned purpose, the present invention provides a baseless liquid heater, including a cup body, a heating plate, a temperature control switch, a heating tube, a bottom shell and an electrical connector are arranged at the lower part of the cup body, the temperature control switch and the heating tube are fixed at the lower end of the heating plate, the temperature control switch is arranged at the center of the heating plate, the heating tube is arc-shaped and is arranged around the temperature control switch, the temperature control switch includes an on-off assembly, the on-off assembly includes a thermistor spring thermally connected to the heating plate and a moving contact piece and a static contact piece that cooperate with the thermistor spring for switching, and the electrical connector is connected and fixed to the shell and is located on one side of the temperature control switch.

[0005] The beneficial effects of the present invention are: the use of a temperature control switch to replace the traditional liquid heater's sudden jump thermostat, fusible fuse and other heating protection elements, fewer parts, wiring and assembly are more convenient, and based on the characteristics of the thermal spring that deforms when overheated and resets when cooled, the liquid heater can be reused, which is more practical than using a one-time disconnected fuse. In terms of the overall structure, the heating tube is arc-shaped, the temperature control switch is set in the middle of the heating tube, and the electrical connector is set on one side of the temperature control switch, so that the overall structure of the lower part of the cup body is more compact, making the liquid heater more compact and improving portability.

[0006] Furthermore, the temperature control switch includes a base and a tray, a recess is provided at the upper end of the base, the tray cover is provided at the recess, a receiving cavity is formed between the base and the tray, one end of the moving contact piece and the static contact piece for switching on and off are both provided in the receiving cavity, the other ends of the moving contact piece and the static contact piece extend out of the receiving cavity and are provided with a first connecting terminal for electrically connecting to the heating tube and a second connecting terminal for electrically connecting to the electrical connector, the thermistor spring is provided on the tray and is driven to cooperate with one end of the moving contact piece through a transmission member movably provided on the base.

[0007] The beneficial effect of the further arrangement is that the moving contact piece and one end of the stationary contact piece are matched for on-off in the accommodating cavity formed between the base and the tray, which can play a certain role in isolation and protection, improve the stability of the temperature control switch, and the thermistor spring can drive one end of the moving contact piece to move through the transmission coordination of the transmission component.

[0008] Furthermore, the end of the arc-shaped heating tube has a conductive contact portion, and the first connecting terminal includes a first extension section and a second extension section extending from the outside of the base, and the first extension section and the second extension section form an angle of at least 90 degrees, and the second extension section is pressed tightly in contact with the conductive contact portion and forms a conductive connection therewith.

[0009] The effect of the further arrangement is that the first connecting terminal is directly electrically connected to the conductive contact portion of the heating tube based on its own elastic compression contact, without the need for connection through wiring or welding. An angle of at least 90 degrees is adopted between the first extension section and the second extension section to give the first connecting terminal a certain elastic compression force, so that it can better contact and electrically connect with the conductive contact portion.

[0010] Furthermore, the temperature control switch includes an anti-power-off reset mechanism, which includes a laterally movable gear lever, the end of which has a limiting portion, and the limiting portion of the gear lever can be driven to extend into the movement path of the moving contact piece based on the force generated when the cup body is placed on a plane and limit the moving contact piece to move only in a direction away from the static contact piece.

[0011] The effect of the further arrangement is that the force generated when the cup body is placed on a plane can drive the limiting part of the gear lever to extend into the movement path of the moving contact piece and limit the moving contact piece to move only in the direction away from the stationary contact piece, which enables the moving contact piece and the stationary contact piece to separate normally when overheated and cannot reset themselves, so that the circuit will not be reconnected, the liquid heater will not repeatedly heat the liquid, and the safety during use is improved.

[0012] Furthermore, a transmission rod is provided at the lower part of the cup body, the upper end of the transmission rod is inserted into the cavity and cooperates with the gear lever drive, the lower end of the transmission rod extends downward from the lower end of the bottom shell and is used to cooperate and interfere with the plane on which the cup body is placed, and an elastic part is provided on the transmission rod for resetting the transmission rod downward.

[0013] The effect of the further arrangement is that when the cup body is placed on a plane, the cup body's own gravity can push the transmission rod to move upward, and the transmission rod drives the push rod to move so that it can form a matching relationship with the moving contact piece. The transmission structure is simple and direct, and the elastic part can drive the lower end of the transmission rod to extend again after the cup body is picked up from the plane, which is more convenient to use.

[0014] Furthermore, a gear rod mounting seat for assembling the gear rod is provided at the center position of the recess, the number of the on-off components is two and they are respectively arranged at the two side positions of the gear rod mounting seat, the gear rod mounting seat includes a laterally arranged mounting hole, the two ends of the mounting hole are respectively arranged toward the moving contact pieces of the two on-off components, the number of the gear rods is two and they are arranged side by side in the mounting hole, the limiting parts of the two gear rods are respectively arranged toward the two moving contact pieces, a notch is provided on the side where the two gear rods are close to each other, the notches of the two gear rods are respectively sleeved on the two side positions of the upper end of the transmission rod, and a transmission structure is provided between the inner wall of the gear rod notch and the upper end of the transmission rod, which can drive the gear rod to move toward the moving contact piece when the transmission rod moves upward.

[0015] The effect of the further arrangement is that the on-off component and the push rod are both two components that can improve the fault tolerance rate of disconnecting the circuit when overheating and preventing reconnection after cooling down, and the two gear levers are arranged side by side on the gear lever mounting base located at the center of the recess, and the notches arranged on the side close to the two gear levers can be respectively arranged on the two side positions of the upper end of the transmission rod, and one transmission rod can drive the two blocks to move at the same time. The overall structural layout is more compact and reasonable, and the volume of the temperature control switch can be reduced. The transmission rod can achieve the transmission structure through which it can drive the gear lever to move toward the moving contact piece while moving upward.

[0016] Furthermore, the transmission structure includes a slide groove arranged on the inner wall of the notch and a slider arranged on the upper end of the transmission rod, the extension direction of the slide groove is inclined relative to the movement direction of the transmission rod and the movement direction of the push rod, and the slider can move along the slide groove.

[0017] The effect of the further arrangement is: since the extension direction of the slide groove is inclined relative to the movement direction of the transmission rod and the movement direction of the push rod, based on the guiding and coordinated sliding between the slide groove and the slider, the upper end of the transmission rod can respectively drive the gear lever limiting part to extend into the movement path of the moving contact piece or escape from the movement path of the moving contact piece when moving up and down. In conjunction with the elastic part, the limiting part of the block can automatically escape from the movement path when the cup body is picked up from the plane, so that the moving contact piece and the static contact piece can be re-established in contact.

[0018] Furthermore, the upper end of the transmission rod has an insertion portion that cooperates with the gear lever drive, and a first annular stopper is arranged at the lower end of the insertion portion. The elastic member is a spring sleeved on the insertion portion, and the upper end of the spring is in abutment with the lower end of the base, and the lower end of the spring is in abutment with the first annular stopper. The lower end of the transmission rod has an extension portion extending from the lower end of the bottom shell, and a second annular stopper is arranged at the upper end of the extension portion. The second annular stopper and the bottom shell form a limiting fit to prevent the transmission rod from falling out toward the bottom of the bottom shell.

[0019] The effect of the further arrangement is that the spring is sleeved on the insertion portion and abutted between the base and the first annular stopper, which can improve the stability of the direction of the spring elastic force, and the second annular stopper can prevent the transmission rod from falling out toward the bottom of the bottom shell, thereby improving stability during operation.

[0020] Furthermore, a through groove is provided at the lower end of the base, through which one end of the movable contact piece can pass when moving downward.

[0021] The effect of the further setting is that the setting of the through groove can increase the activity space of one end of the moving contact piece, so that the moving contact piece and the static contact piece can be separated by a certain distance after separation, increasing the creepage distance, thereby improving safety. The setting of the through groove makes the volume of the temperature control switch smaller and more compact.

[0022] Furthermore, a guide member for the transmission member to slide through is arranged above the through groove, and the guide member is spliced ​​and fixed to the base through a guide member mounting seat integrally formed on the base, and one end of the guide member has a guide portion that cooperates with the transmission member for movably sleeved, and the other end of the guide member is a plug-in portion, and the guide portion and the plug-in portion are connected by an extension arm.

[0023] The effect of the further setting is that the guide member can guide the movement of the transmission component. Since the guide member is arranged above the through groove, it is not conducive to the demolding of the base during injection molding. Therefore, the guide member and the base are separated into two parts, and are installed and fixed through a guide member mounting seat integrally formed on the base, which is convenient for processing and molding. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The structure of the embodiment of the present invention Figure 1 ;

[0025] Figure 2 The structure of the embodiment of the present invention Figure 2 ;

[0026] Figure 3 It is a schematic diagram of the assembly of the temperature control switch in the embodiment of the present invention;

[0027] Figure 4 A partial cross-sectional view of an embodiment of the present invention;

[0028] Figure 5 The structure of the temperature control switch in the embodiment of the present invention is Figure 1 ;

[0029] Figure 6 An exploded view of a temperature control switch in an embodiment of the present invention;

[0030] Figure 7 The structure of the temperature control switch in the embodiment of the present invention is Figure 2 ;

[0031] Figure 8 It is a structural diagram of the anti-power-off reset mechanism in an embodiment of the present invention;

[0032] Fig. 9 Schematic diagram of the coordination between the stopper and the moving contact piece in an embodiment of the present invention;

[0033] Fig.10 It is a schematic diagram of the assembly of the transmission structure in the embodiment of the present invention;

[0034] Fig.11 It is a schematic diagram of assembling the gear lever mounting seat in an embodiment of the present invention;

[0035] Fig.12 Schematic diagram of the assembly of the guide member in the embodiment of the present invention. DETAILED DESCRIPTION

[0036] The embodiment of the baseless liquid heater of the present invention is as follows: Figure 1-12As shown: it includes a cup body 1, a heating plate 2, a temperature control switch 3, a heating tube 4, a bottom shell 5 and an electric connector 6 are arranged at the lower part of the cup body 1, the heating plate 2, the temperature control switch 3, and the heating tube 4 are covered together in the bottom shell 5, and the electric connector 6 is penetrated at the inner and outer sides of the bottom shell 5, the temperature control switch 3 and the heating tube 4 are fixed at the lower end of the heating plate 2, the temperature control switch 3 is arranged at the center of the bottom of the heating plate 2, the heating tube 4 is arc-shaped and is arranged around the temperature control switch 3, the temperature control switch 3 includes a switch assembly, the switch assembly includes a thermal spring 31 thermally connected to the heating plate 2 and a moving contact piece 32 and a static contact piece 33 that cooperate with the thermal spring 31 for switching, the electric connector 6 is connected and fixed with the shell 5 and is located at one side of the temperature control switch 3, the cup body 1 has a handle, the electric connector 6 is located below the handle, the electric connector 6 is used to be plugged and electrically connected to the power cord a sideways, and the electric connector 6 is shielded and hidden by the handle, which can improve the overall aesthetics.

[0037] The temperature control switch 3 includes a base 34 and a tray 35. A notch 341 is provided at the upper end of the base 34. The tray 35 is covered at the notch 341. A receiving cavity (not shown in the figure) is formed between the base 34 and the tray 35. One end of the moving contact piece 32 and the static contact piece 33 for switching on and off are both arranged in the receiving cavity. The other ends of the moving contact piece 32 and the static contact piece 33 extend out of the receiving cavity and are formed with a first connecting terminal 321 for electrically connecting to the heating tube 4 and a second connecting terminal 331 for electrically connecting to the electrical connector 6. In this embodiment, the first connecting terminal 321 and the second connecting terminal 331 are respectively formed on the moving contact piece 32 and the static contact piece 33, but in other examples, the first connecting terminal 32 1 and the second connecting terminal 331 can also be formed on the static contact piece 33 and the movable contact piece 32 respectively. The thermal spring piece 31 is arranged on the tray 35 and is pressed and contacted with the lower end of the heating plate 2 by the tray 35. The thermal spring piece 31 is driven and matched with one end of the movable contact piece 32 through a transmission member 36 movably arranged on the base 34. The movable contact piece 32 is pressed on the static contact piece 33 based on its own elasticity in normal state and connects the circuit between the first connecting terminal 321 and the second connecting terminal 331. The thermal spring piece 31 described in the present invention can be deformed when the temperature reaches a threshold value and reset after the temperature drops. At the same time, it can drive one end of the movable contact piece 32 to move away from the static contact piece 33 through the transmission member 36. Thereby, the circuit between the first connecting terminal 321 and the second connecting terminal 331 can be disconnected. By selecting the types of thermistors 31 with different temperature thresholds, the circuit can be disconnected when the liquid heater heats the liquid to a boiling or dry-burning state. A thermistor 38 thermally connected to the heating plate 2 is also provided on the tray 35. The thermistor 38 is also pressed and contacted on the heating plate 2 through the tray 35. The thermistor 38 can output a current signal, which can be displayed on the liquid screen (not shown in the figure) on the outside of the bottom shell 5 through the integrated control circuit, and fine control of the temperature can also be achieved.

[0038] The end of the arc-shaped heating tube 4 has a conductive contact portion 41. The first connecting terminal 321 includes a first extension section 3211 and a second extension section 3212 extending from the outside of the base 34. The first extension section 3211 and the second extension section 3212 form at least a 90-degree angle. The bending angle between the first extension section 3211 and the second extension section 3212 can be based on a certain elasticity of the second extension section 3212, so that the second extension section 3212 can be pressed and contacted on the conductive contact portion 41 and form a conductive connection therewith. No wiring is required between the conductive contact portion 41 and the first connecting terminal 321, which is convenient for assembly.

[0039] The temperature control switch 3 includes an anti-power-off reset mechanism, which includes a laterally movable gear lever 37, and a limiting portion 371 at the end of the gear lever 37. The limiting portion 371 of the gear lever can be driven to extend into the movement path of the moving contact piece 32 based on the force generated when the cup body 1 is placed on a plane, and limit the moving contact piece 32 to move only in the direction away from the static contact piece 33. In the present embodiment, the limiting portion 371 is a wedge-shaped structure, and its side facing the static contact piece 33 is relatively inclined to the wide surface of the dynamic contact piece 32, and its other side away from the static contact piece 33 is relatively parallel to the wide surface of the dynamic contact piece 32. When it is inserted into the movement path of the dynamic contact piece 32, it can form a one-way limiting cooperation with the dynamic contact piece 32. This is mainly based on the fact that when the dynamic contact piece 32 moves in the direction away from the static contact piece 33 and collides with one side of the limiting portion 371, it can be driven by the force to deform and continue to move beyond the limiting portion 371. On the contrary, when it moves in the direction of the static contact piece 33 and collides with the other side of the limiting portion 371, it will not be deformed and cannot continue to move beyond the limiting portion 371. Therefore, when the dynamic contact piece 32 and the static contact piece 33 are separated and disconnected, the dynamic contact piece 32 will not re-contact and connect with the static contact piece 33 due to the deformation and reset of the thermal spring piece 31, thereby realizing the function of preventing the heater from repeatedly heating the liquid.

[0040] A transmission rod 7 is provided at the lower part of the cup body 1, and the upper end of the transmission rod 7 is inserted into the cavity and driven by the shift rod 37. The lower end of the transmission rod 7 extends downward from the lower end of the bottom shell 5 and is used to cooperate with the plane on which the cup body 1 is placed. An elastic member is provided on the transmission rod 7 for resetting the transmission rod 7 downward. When the cup body 1 is placed on a plane, the lower end of the transmission rod 7 cooperates with the plane. Based on the gravity of the cup body 1 itself, the transmission rod 7 can be driven to move upward, and then the shift rod 37 can be driven to move. Through the elastic member, the transmission rod 7 can also be reset downward when the cup body 1 is lifted from the plane, which is convenient for use.

[0041] A lever mounting seat 342 for mounting a lever 37 is provided at the center position of the recess 341. The number of switch components is two and they are respectively arranged at the two sides of the lever mounting seat 342. The lever mounting seat 342 includes a laterally arranged mounting hole 3421. The two ends of the mounting hole 3421 are respectively arranged toward the moving contact pieces 32 of the two switch components. The number of levers 37 is two and they are arranged side by side in the mounting hole 3421. The two levers 37 can slide along the directions at the two ends of the mounting hole 3421. The limiting parts 371 of the two levers 37 are respectively arranged toward the two moving contact pieces 32. A notch 372 is provided on the side where the two levers 37 are close to each other. The notches 372 of the two gear levers are respectively sleeved on both sides of the upper end of the transmission rod 7. The lateral width of the notch 372 is greater than the width of the transmission rod 7, so that the transmission rod 7 has a certain lateral activity space in the notch 372. A transmission structure is arranged between the inner wall of the notch 372 of the gear lever and the upper end of the transmission rod 7, which can drive the gear lever 37 to move toward the moving contact piece 32 when the transmission rod 7 moves upward. The upper end of the gear lever mounting seat 342 is provided with an opening 3422 for the upper end of the transmission rod 7 to extend. The setting of the opening 3422 can increase the upper and lower activity space of the transmission rod 7, thereby increasing the activity range of the gear lever 37, and to a certain extent, can also make the volume of the temperature control switch smaller. The power to drive the limit portion 371 of the gear lever 37 to escape from the movement path of the moving contact piece 32 can be realized by an elastic member arranged between the gear lever 37 and the gear lever mounting seat 342, such as a spring or a tension spring, or can be realized by the transmission structure, and the limit portion 371 of the gear lever 37 is driven to reset by the downward reset of the transmission rod 7.

[0042] In order to realize bidirectional transmission of the gear rod 37, the transmission structure includes a slide groove 3721 arranged on the inner wall of the notch 372 and a slider 71 arranged on the upper end of the transmission rod 7. The extension direction of the slide groove 3721 is inclined relative to the movement direction of the transmission rod 7 and the movement direction of the push rod 37. The slider 71 can move along the slide groove 3721. Based on the lateral component force when the slider 71 moves up and down along the slide groove 3721, the gear rod 37 can slide in both directions along the two ends of the mounting hole 3421.

[0043] The upper end of the transmission rod 7 has an insertion portion 72 that cooperates with the driving of the gear lever 37. The sliding block 71 is arranged on the insertion portion 72. The lower end of the insertion portion 72 is provided with a first annular stopper 73. The elastic member is a spring 8 sleeved on the insertion portion 72. The upper end of the spring 8 abuts and cooperates with the lower end of the base 34, and the lower end of the spring 8 abuts and cooperates with the first annular stopper 73. Of course, the same effect can be achieved by arranging the elastic member between the transmission rod 7 and the bottom shell 5 or between the transmission rod 7 and other components fixed in the bottom shell 5. The lower end of the transmission rod 7 has an extension portion 74 extending from the lower end of the bottom shell 5. The width of the extension portion 74 is slightly larger than that of the insertion portion 72 to prevent the extension portion 74 from being bent and broken when it contacts the plane in a non-vertical direction. A second annular stopper 75 is provided at the upper end of the extension portion 74. The second annular stopper 75 and the bottom shell 5 form a limit fit to prevent the transmission rod 7 from falling out toward the bottom of the bottom shell 5. The base 34 has a through slot 343 at its lower end through which one end of the moving contact piece 32 can pass when it moves downward. When one end of the moving contact piece 32 is driven downward by the transmission member 36, it can pass through the through slot 343. Therefore, the through slot 343 has at least a larger lateral dimension than one end of the moving contact piece 32. This allows one end of the moving contact piece 32 to maintain a safe distance from the static contact piece 33 when it is driven downward to the farthest position, thereby preventing the generation of creepage, improving safety, and further making the volume of the temperature control switch 3 more compact and small.

[0044] A guide member 9 is provided above the through groove 343 for the transmission member 36 to slide through. In the present embodiment, the transmission member 36 is a ceramic rod, and may also be a columnar member supported by other high temperature resistant materials. The guide member 9 is spliced ​​and fixed to the base 34 through a guide member mounting seat 344 integrally formed on the base 34. One end of the guide member 9 has a guide portion 91 that cooperates with the transmission member 36 for movability, and the other end of the guide member 9 is a plug-in portion 92. The guide portion 91 and the plug-in portion 92 are connected by an extension arm 93. The guide member mounting seat 344 is provided with an insertion port 3441 on the side facing the tray 35. The plug-in portion 92 is inserted downward into the insertion port 3441 for fixation. On the one hand, the plug-in portion 92 and the insertion port 3441 are plug-in fixed by interference fit, and on the other hand, the tray 35 can also form a limit for the plug-in portion 92 to prevent it from slipping out along the outer side of the insertion port 3441, thereby ensuring the stable position of the guide member 9.

[0045] The above embodiment is only one of the preferred specific embodiments of the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention are all included in the protection scope of the present invention.

Claims

1. A baseless liquid heater, comprising a cup body, a heating plate, a temperature control switch, a heating tube, a bottom shell and an electrical connector are arranged at the lower part of the cup body, the temperature control switch and the heating tube are fixed at the lower end of the heating plate, characterized in that: The temperature control switch is arranged at the center of the heating disk, the heating tube is arc-shaped and arranged around the temperature control switch, the temperature control switch includes an on-off assembly, the on-off assembly includes a thermal spring connected to the heating disk and a moving contact piece and a static contact piece that cooperate with the thermal spring piece for on-off, the electrical connector is connected and fixed with the shell and is located on one side of the temperature control switch; the temperature control switch includes a base and a tray, a notch is provided at the upper end of the base, the tray cover is arranged at the notch, a receiving cavity is formed between the base and the tray, one end of the moving contact piece and the static contact piece that cooperate for on-off are both arranged in the receiving cavity, and the moving contact piece and the static contact piece are provided with a notch. The other end of the heating element extends out of the accommodating cavity and is formed with a first connecting terminal for electrically connecting to the heating tube and a second connecting terminal for electrically connecting to the electrical connector. The thermal spring is arranged on the tray and forms a driving match with one end of the moving contact piece through a transmission member movably arranged on the base; the end of the arc-shaped heating tube has a conductive contact portion, the first connecting terminal includes a first extension section and a second extension section extending from the outside of the base, and at least a 90-degree angle is formed between the first extension section and the second extension section, and the second extension section is pressed and contacted on the conductive contact portion and forms a conductive connection therewith; the temperature control switch includes a power-off prevention reset mechanism The anti-power-off reset mechanism includes a gear lever that moves laterally, and a limiting portion is provided at the end of the gear lever. The limiting portion of the gear lever can be driven to extend into the movement path of the moving contact piece based on the force generated when the cup body is placed on a plane and limit the moving contact piece to move only in the direction away from the static contact piece; a transmission rod is provided at the lower part of the cup body, the upper end of the transmission rod is inserted into the cavity and cooperates with the gear lever drive, the lower end of the transmission rod extends downward from the lower end of the bottom shell and is used to cooperate and contact with the plane where the cup body is placed, and an elastic part for the transmission rod to reset downward is provided on the transmission rod; a gear rod mounting for the gear rod to be assembled is provided at the center position of the recess Mounting seat, the number of the on-off components is two and they are respectively arranged on both sides of the gear lever mounting seat, the gear lever mounting seat includes a laterally arranged mounting hole, both ends of the mounting hole are respectively arranged toward the moving contact pieces of the two on-off components, the number of the gear levers is two and they are arranged side by side in the mounting holes, the limiting parts of the two gear levers are respectively arranged toward the two moving contact pieces, a notch is provided on the side where the two gear levers are close to each other, the notches of the two gear levers are respectively sleeved on both sides of the upper end of the transmission rod, and a transmission structure is provided between the inner wall of the gear lever notch and the upper end of the transmission rod, which can drive the gear lever to move toward the moving contact piece when the transmission rod moves upward.

2. The baseless liquid heater according to claim 1, characterized in that: The transmission structure includes a slide groove arranged on the inner wall of the notch and a slider arranged on the upper end of the transmission rod. The extension direction of the slide groove is inclined relative to the movement direction of the transmission rod and the movement direction of the push rod, and the slider can move along the slide groove.

3. The baseless liquid heater according to claim 1 or 2, characterized in that: The upper end of the transmission rod has an insertion portion that cooperates with the gear lever drive, and a first annular stopper is arranged at the lower end of the insertion portion. The elastic member is a spring sleeved on the insertion portion, and the upper end of the spring is in abutment with the lower end of the base, and the lower end of the spring is in abutment with the first annular stopper. The lower end of the transmission rod has an extension portion extending from the lower end of the bottom shell, and a second annular stopper is arranged at the upper end of the extension portion. The second annular stopper and the bottom shell form a limiting fit to prevent the transmission rod from slipping out toward the bottom of the bottom shell.

4. The baseless liquid heater according to claim 1 or 2, characterized in that: The lower end of the base is provided with a through slot through which one end of the movable contact piece can pass when moving downward.

5. The baseless liquid heater according to claim 4, characterized in that: A guide piece for the transmission component to slide through is arranged above the through groove. The guide piece is spliced ​​and fixed to the base through a guide piece mounting seat integrally formed on the base. One end of the guide piece has a guide part that is movably sleeved with the transmission component, and the other end of the guide piece is a plug-in part. The guide part and the plug-in part are connected by an extension arm.

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