Instant electric water heater with dry burning prevention function

Abstract

The instant electric water heater comprises an electric heating component and a heating container, the heating container is provided with an inner cavity with an opening in the upper end, and the heating end of the electric heating component is inserted into the inner cavity from top to bottom; the instant electric water heater further comprises a water level monitoring unit and a switch assembly, the water level monitoring unit and the switch assembly are both located at the upper end of the heating container, the switch assembly is fixed to the outer wall of the heating container, and the water level monitoring unit is arranged between the heating container and the switch assembly. The switch assembly is electrically connected between the electric heating component and a controller in the instant electric water heater in series. The water level monitoring unit is used for monitoring the water level in the heating container, when the water level in the heating container is in a normal state, the water level monitoring unit is used for triggering the switch assembly so that the switch assembly can be switched on, and when the water level in the heating container is lower than the normal state, the water level monitoring unit stops triggering the switch assembly so that the switch assembly can be switched off; according to the utility model, the electric heating component can be prevented from being in a dry burning state.

Description

Technical Field

[0001] The utility model relates to the technical field of instant electric water heaters, and in particular to an instant electric water heater with an anti-dry-burning function. Background Art

[0002] An instant electric water heater is a device for heating water. The instant electric water heaters currently on the market include an electric heating component and a heating tank. The heating tank has an inner cavity with an open upper end. The heating end of the electric heating component is inserted into the inner cavity from top to bottom. The upper end of the electric heating component is fixed to the upper end of the heating tank and is circumferentially sealed. A water inlet interface and a water outlet interface connected to the inner cavity are provided on the side wall of the heating tank. When water enters the heating tank through the water inlet interface, the electric heating component can heat the water entering the heating tank. After the water in the heating tank is heated by the electric heating component, it can be discharged through the water outlet interface. However, during the use of the existing instant electric water heater, when there is a water outage and the heating tank is short of water, the electric heating component will be in a dry-burning state, which can easily cause damage to the electric heating component. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide an instant electric water heater with an anti-dry-burning function. When the heating tank is short of water during use, the power supply of the electric heating component can be immediately disconnected, thereby preventing the electric heating component from being in a dry-burning state, that is, effectively avoiding damage to the electric heating component.

[0004] The utility model provides an instant electric water heater with an anti-dry-burning function, comprising an electric heating component and a heating tank, the heating tank having an inner cavity with an upper end opening, the heating end of the electric heating component being inserted into the inner cavity from top to bottom, the upper end of the electric heating component being fixed to the upper end of the heating tank and being circumferentially sealed; a water inlet interface and a water outlet interface communicating with the inner cavity are arranged on the side wall of the heating tank; the instant electric water heater also comprises a water level monitoring unit and a switch assembly, the water level monitoring unit and the switch assembly are both located at the upper end of the heating tank, the switch assembly is fixed on the outer wall of the heating tank, and the water level monitoring unit is arranged between the heating tank and the switch assembly; the switch assembly is electrically connected in series between the electric heating component and a controller in the instant electric water heater; the water level monitoring unit is used for monitoring the water level in the heating tank, when the water level in the heating tank is in a normal state, the water level monitoring unit is used for triggering the switch assembly to turn on the switch assembly, when the water level in the heating tank is lower than the normal state, the water level monitoring unit stops triggering the switch assembly to turn off the switch assembly.

[0005] After the utility model adopts the above structure, when the utility model is used, the water level monitoring unit can monitor the water level in the heating tank in real time. When the water level in the heating tank is in a normal state, the water level monitoring unit can trigger the switch component to turn on the switch component. When the water level in the heating tank is lower than the normal state, the water level monitoring unit can stop triggering the switch component to turn off the switch component. That is, when there is a lack of water in the heating tank, the power supply of the electric heating component can be immediately disconnected, thereby preventing the electric heating component from being in a dry-burning state, that is, effectively preventing the damage of the electric heating component.

[0006] In a possible embodiment, the water level monitoring unit includes a deformable driving member made of a flexible material, a concave cavity with an opening is formed inside the driving member, the open end of the concave cavity faces the heating tank, the driving member located at the open end of the concave cavity is fixed to the outer wall of the heating tank and circumferentially sealed, and a channel for connecting the inner cavity and the concave cavity is provided on the side wall of the heating tank; when the water level in the heating tank changes, the driving member changes with the water level and deforms, so that the driving member triggers or stops triggering the switch component; after adopting this water level monitoring unit, when the water level in the heating tank changes, the driving member changes with the water level and deforms, so that the driving member triggers or stops triggering the switch component; that is, when the water level in the heating tank is in a normal state (the water level in the heating tank is higher than the position of the driving member), the driving member can trigger the switch component to turn on the switch component, and when the water level in the heating tank is lower than the normal state (the water level in the heating tank is lower than the position of the driving member), the driving member can release the triggering of the switch component to turn off the switch component, thereby realizing the on-off control of the electric heating component.

[0007] In a possible embodiment, the driving member includes a disc-shaped base and a ring-shaped connecting portion, one end of the connecting portion is integrally connected to the outer edge of the base, the other end of the connecting portion is fixed on the outer wall of the heating vessel and circumferentially sealed with the outer wall of the heating vessel, the base and the connecting portion form a concave cavity, the base is used to sense water level changes and float relative to the heating vessel in a direction away from or close to the heating vessel, when the base floats relative to the heating vessel in a direction away from or close to the heating vessel, the base is used to trigger or stop triggering the switch assembly; by adopting such a driving member, the base can sense water level changes and float relative to the heating vessel in a direction away from or close to the heating vessel, when the base floats relative to the heating vessel in a direction away from or close to the heating vessel, the base can trigger or stop triggering the switch assembly; that is, when the water level in the heating vessel is in a normal state, the base can trigger the switch assembly to turn on the switch assembly, and when the water level in the heating vessel is lower than the normal state, the base can release the triggering of the switch assembly to turn off the switch assembly, thereby realizing the on-off power control of the electric heating component.

[0008] In a possible embodiment, an annular fold is formed at the connection between one end of the connecting portion and the outer edge of the base, and an annular deformation groove is formed on the inner side of the annular fold. By adopting this structure, when the water level in the heating tank changes, under the action of the annular deformation groove, the base can more smoothly sense the water level change and float relative to the heating tank in a direction away from or close to the heating tank, that is, the response accuracy and speed of the base and the driving member can be improved, so that the base can more smoothly trigger or stop triggering the switch assembly.

[0009] In a possible embodiment, a top rod is provided in the middle of a side of the base away from the heating bulb, and the top rod extends along the side away from the heating bulb. When the base floats relative to the heating bulb in a direction away from or close to the heating bulb, the top rod is used to trigger or stop triggering the switch assembly. By providing a top rod in the middle of a side of the base away from the heating bulb, and the top rod extends along the side away from the heating bulb, when the base floats relative to the heating bulb in a direction away from or close to the heating bulb, under the action of the top rod, the base can more reliably and smoothly trigger or stop triggering the switch assembly.

[0010] In a possible embodiment, the switch assembly includes a moving contact piece, a stationary contact piece and a support; the support is fixed on the outer wall of the heating tank, one end of the moving contact piece and one end of the stationary contact piece are fixed to the support, one end of the moving contact piece is electrically connected to one of the terminals of the electric heating component, one end of the stationary contact piece is electrically connected to one of the output terminals of the controller, the other terminal of the electric heating component is electrically connected to the other output terminal of the controller, the other end of the moving contact piece forms a moving contact, the other end of the stationary contact piece forms a stationary contact, and the moving contact and the stationary contact are clearance-matched; a through hole is provided on the support, and the end of the push rod away from the base moves through the through hole and then abuts against the side of the moving contact away from the stationary contact. ; When the base floats relative to the heating tank in a direction away from or close to the heating tank, the push rod is used to push or stop pushing the contact to make the moving contact contact or disengage from the static contact; by adopting this switch assembly, when the base floats relative to the heating tank in a direction away from the heating tank, the push rod can push the contact to make the moving contact contact with the static contact, at this time, the power of the electric heating component can be turned on, and when the base floats relative to the heating tank in a direction close to the heating tank, the push rod can release the pushing of the moving contact to make the moving contact disengage from the static contact, at this time, the power of the electric heating component can be disconnected, so that the power on and off of the electric heating component can be controlled by the change of the water level in the heating tank.

[0011] In a possible embodiment, an annular limiting sleeve is provided on the outer wall of the heating chamber, the driving member is provided on the inner side of the limiting sleeve, an annular convex edge extending outward is provided on the other end of the connecting portion, an annular plug plate is provided on the side of the support facing the heating chamber, the annular plug plate is inserted into the limiting sleeve, and the annular convex edge is pressed against the outer wall of the heating chamber through the annular plug plate and is tightly sealed with the outer wall of the heating chamber; after adopting this structure, under the action of the limiting sleeve, the driving member can be reliably limited to the inner side of the limiting sleeve, and through the setting of the annular convex edge, under the action of the annular plug plate, the annular plug plate can reliably press the annular convex edge against the outer wall of the heating chamber, so that the driving member located at the opening end of the concave cavity and the outer wall of the heating chamber can be reliably fixed and circumferentially sealed.

[0012] In a possible embodiment, an annular groove is provided on the outer wall of the heating vessel, and the other end of the connecting portion and the annular convex edge are embedded in the annular groove; after the annular groove is provided on the outer wall of the heating vessel, the other end of the connecting portion and the annular convex edge can be embedded in the annular groove, thereby further limiting the driving member to avoid circumferential displacement of the driving member.

[0013] In a possible embodiment, a plurality of support columns distributed at circumferential intervals are provided on the outer wall of the heating chamber, and the support columns are fixed to the outer wall of the heating chamber by screws that pass through the support and are threadedly connected to the plurality of support columns one by one; by adopting this structure, the support can be reliably fixed to the outer wall of the heating chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0015] Figure 2 It is a schematic diagram of the exploded three-dimensional structure of the first part of the utility model;

[0016] Figure 3 It is a schematic diagram of the exploded three-dimensional structure of the second part of the utility model;

[0017] Figure 4 It is a cross-sectional structural schematic diagram of the utility model;

[0018] Figure 5 for Figure 4 Schematic diagram of the structure after enlarging point A in the middle. DETAILED DESCRIPTION

[0019] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0020] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0021] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0022] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] See also Figure 1-5 As shown, the embodiment of the present application discloses an instant electric water heater with an anti-dry-burning function, comprising an electric heating component 1 and a heating tank 2, the heating tank 2 having an inner cavity 21 with an upper end opening, the heating end 11 of the electric heating component 1 being inserted into the inner cavity 21 from top to bottom, the upper end of the electric heating component 1 being fixed to the upper end of the heating tank 2 and being circumferentially sealed; a water inlet interface 22 and a water outlet interface 23 communicating with the inner cavity 21 are provided on the side wall of the heating tank 2; the instant electric water heater also comprises a water level monitoring unit and a switch assembly, both of which are Located at the upper end of the heating tank 2, the switch assembly is fixed on the outer wall of the heating tank 2, and the water level monitoring unit is arranged between the heating tank 2 and the switch assembly; the switch assembly is electrically connected in series between the electric heating component 1 and the controller in the instant electric water heater; the water level monitoring unit is used to monitor the water level in the heating tank 2, when the water level in the heating tank 2 is in a normal state, the water level monitoring unit is used to trigger the switch assembly to turn on the switch assembly, when the water level in the heating tank 2 is lower than the normal state, the water level monitoring unit stops triggering the switch assembly to turn off the switch assembly.

[0024] The water level monitoring unit comprises a deformable driving member 3 made of a flexible material, a concave cavity 31 with an opening is formed inside the driving member 3, the open end of the concave cavity 31 faces the heating container 2, the driving member 3 located at the open end of the concave cavity 31 is fixed to the outer wall of the heating container 2 and is circumferentially sealed, and a channel 24 for connecting the inner cavity 21 and the concave cavity 31 is provided on the side wall of the heating container 2; when the water level in the heating container 2 changes, the driving member 3 changes with the water level and produces a deformation, so that the driving member 3 triggers or stops triggering the switch assembly; by adopting this water level monitoring unit Afterwards, when the water level in the heating tank changes, the driving member changes with the water level and deforms, so that the driving member triggers or stops triggering the switch component; that is, when the water level in the heating tank is in a normal state (the water level in the heating tank is higher than the position of the driving member), the driving member can trigger the switch component to turn on the switch component, and when the water level in the heating tank is lower than the normal state (the water level in the heating tank is lower than the position of the driving member), the driving member can release the triggering of the switch component to turn off the switch component, thereby realizing the on and off power control of the electric heating component.

[0025] The driving member 3 includes a disc-shaped base 32 and a ring-shaped connecting portion 33. One end of the connecting portion 33 is connected to the outer edge of the base 32 as a whole. The other end of the connecting portion 33 is fixed to the outer wall of the heating tank 2 and is circumferentially sealed with the outer wall of the heating tank 2. The base 32 and the connecting portion 33 form a concave cavity 31. The base 32 is used to sense the change of the water level and float relative to the heating tank 2 in a direction away from or close to the heating tank 2. When the base 32 floats relative to the heating tank 2 in a direction away from or close to the heating tank 2, the base 32 is used to trigger or stop triggering the switch group. By adopting such a driving member, the base can sense the change of water level and float relative to the heating tank in a direction away from or close to the heating tank. When the base floats relative to the heating tank in a direction away from or close to the heating tank, the base can trigger or stop triggering the switch component; that is, when the water level in the heating tank is in a normal state, the base can trigger the switch component to turn on the switch component, and when the water level in the heating tank is lower than the normal state, the base can release the triggering of the switch component to turn off the switch component, thereby realizing the on-off control of the electric heating component.

[0026] An annular fold 34 is formed at the connection between one end of the connecting portion 33 and the outer edge of the base 32, and an annular deformation groove 35 is formed on the inner side of the annular fold 34. By adopting this structure, when the water level in the heating tank changes, under the action of the annular deformation groove, the base can more smoothly sense the water level change and float relative to the heating tank in a direction away from or close to the heating tank, that is, the response accuracy and speed of the base and the driving member can be improved, so that the base can more smoothly trigger or stop triggering the switch assembly.

[0027] A top rod 36 is provided in the middle of the side of the base 32 away from the heating bulb 2, and the top rod 36 extends along the side away from the heating bulb 2. When the base 32 floats relative to the heating bulb 2 in a direction away from or close to the heating bulb 2, the top rod 36 is used to trigger or stop triggering the switch assembly. After the top rod is provided in the middle of the side of the base away from the heating bulb, and the top rod extends along the side away from the heating bulb, when the base floats relative to the heating bulb in a direction away from or close to the heating bulb, under the action of the top rod, the base can more reliably and smoothly trigger or stop triggering the switch assembly.

[0028] The switch assembly includes a moving contact piece 4, a stationary contact piece 5 and a support 6; the support 6 is fixed on the outer wall of the heating tank 2, one end of the moving contact piece 4 and one end of the stationary contact piece 5 are fixed to the support 6, one end of the moving contact piece 4 is electrically connected to one of the terminals of the electric heating component 1, one end of the stationary contact piece 5 is electrically connected to one of the output terminals of the controller, the other terminal of the electric heating component 1 is electrically connected to the other output terminal of the controller, the other end of the moving contact piece 4 forms a moving contact 41, the other end of the stationary contact piece 5 forms a stationary contact 51, and the moving contact 41 and the stationary contact 51 are clearance-matched; a through hole 61 is provided on the support 6, and the end of the top rod 36 away from the base 32 moves through the through hole 61 and then contacts the moving contact 41 away from the stationary contact 51 One side abuts against each other; when the base 32 floats relative to the heating tank 2 in a direction away from or close to the heating tank 2, the push rod 36 is used to push or stop pushing the contact 41 to make the moving contact 41 contact or disengage with the static contact 51; after adopting this switch assembly, when the base floats relative to the heating tank in a direction away from the heating tank, the push rod can push the contact to make the moving contact contact with the static contact, at this time, the power of the electric heating component can be turned on, and when the base floats relative to the heating tank in a direction close to the heating tank, the push rod can release the pushing of the moving contact to make the moving contact disengage with the static contact, at this time, the power of the electric heating component can be disconnected, so that the power on and off of the electric heating component can be controlled by the change of the water level in the heating tank.

[0029] An annular limiting sleeve 25 is provided on the outer wall of the heating chamber 2, the driving member 3 is provided on the inner side of the limiting sleeve 25, an annular convex edge 37 extending outward is provided on the other end of the connecting portion 33, and an annular plug plate 62 is provided on the side of the support 6 facing the heating chamber 2, the annular plug plate 62 is inserted into the limiting sleeve 25, and the annular convex edge 37 is pressed against the outer wall of the heating chamber 2 through the annular plug plate 62 and is tightly sealed with the outer wall of the heating chamber 2; after adopting this structure, under the action of the limiting sleeve, the driving member can be reliably limited to the inner side of the limiting sleeve, and through the setting of the annular convex edge, under the action of the annular plug plate, the annular plug plate can reliably press the annular convex edge against the outer wall of the heating chamber, so that the driving member located at the opening end of the concave cavity and the outer wall of the heating chamber can be reliably fixed and circumferentially sealed.

[0030] An annular groove 26 is provided on the outer wall of the heating vessel 2, and the other end of the connecting portion 33 and the annular convex edge 37 are embedded in the annular groove 26; after the annular groove is provided on the outer wall of the heating vessel, the other end of the connecting portion and the annular convex edge can be embedded in the annular groove, thereby further limiting the driving member to avoid circumferential displacement of the driving member.

[0031] A plurality of support columns 27 are arranged on the outer wall of the heating tank 2 at circumferential intervals. The support columns 27 are fixed to the outer wall of the heating tank 2 by screws that penetrate the support 6 and are threadedly connected to the plurality of support columns 27 one by one. By adopting this structure, the support can be reliably fixed to the outer wall of the heating tank.

[0032] The instant electric water heater also includes a water inlet pipe 7 and a water outlet pipe 8, one end of the water inlet pipe 7 is connected to the water inlet interface 22, and one end of the water outlet pipe 8 is connected to the water outlet interface 23; by adopting this structure, the water to be heated can reliably enter the heating tank through the water inlet pipe, and the water heated by the electric heating component can be reliably discharged from the heating tank through the water outlet pipe.

[0033] A plurality of connecting pieces 28 are provided on the outer walls on both sides of the left and right sides of the heating tank 2 and are spaced apart from top to bottom. The heating tank 2 is fixed to the housing of the instant electric water heater by screws which are passed through each connecting piece 28 and threadedly connected to the housing of the instant electric water heater. By adopting this structure, the heating tank can be reliably fixed to the housing of the instant electric water heater.

[0034] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. An instant electric water heater with an anti-dry-burning function, comprising an electric heating component (1) and a heating tank (2), the heating tank (2) having an inner cavity (21) with an upper end open, the heating end (11) of the electric heating component (1) being inserted into the inner cavity (21) from top to bottom, the upper end of the electric heating component (1) being fixed to the upper end of the heating tank (2) and circumferentially sealed; a water inlet interface (22) and a water outlet interface (23) communicating with the inner cavity (21) are arranged on the side wall of the heating tank (2); the characteristics are as follows: The instant electric water heater further comprises a water level monitoring unit and a switch assembly, both of which are located at the upper end of the heating vessel (2), the switch assembly is fixed on the outer wall of the heating vessel (2), and the water level monitoring unit is arranged between the heating vessel (2) and the switch assembly; the switch assembly is electrically connected in series between the electric heating component (1) and a controller in the instant electric water heater; the water level monitoring unit is used to monitor the water level in the heating vessel (2); when the water level in the heating vessel (2) is in a normal state, the water level monitoring unit is used to trigger the switch assembly to turn on the switch assembly; when the water level in the heating vessel (2) is lower than the normal state, the water level monitoring unit stops triggering the switch assembly to turn off the switch assembly.

2. The instant electric water heater with anti-dry-burning function according to claim 1, characterized in that: The water level monitoring unit comprises a deformable driving member (3) made of a flexible material, a concave cavity (31) with an opening is formed inside the driving member (3), the open end of the concave cavity (31) faces the heating vessel (2), the driving member (3) located at the open end of the concave cavity (31) is fixed to the outer wall of the heating vessel (2) and is circumferentially sealed, and a channel (24) for connecting the inner cavity (21) and the concave cavity (31) is provided on the side wall of the heating vessel (2); when the water level in the heating vessel (2) changes, the driving member (3) changes with the water level and is deformed, so that the driving member (3) triggers or stops triggering the switch assembly.

3. The instant electric water heater with anti-dry-burning function according to claim 2, characterized in that: The driving member (3) comprises a disc-shaped base (32) and a ring-shaped connecting portion (33); one end of the connecting portion (33) is integrally connected to the outer edge of the base (32); the other end of the connecting portion (33) is fixed to the outer wall of the heating vessel (2) and is circumferentially sealed with the outer wall of the heating vessel (2); the base (32) and the connecting portion (33) enclose the concave cavity (31); the base (32) is used to sense water level changes and float relative to the heating vessel (2) in a direction away from or close to the heating vessel (2); when the base (32) floats relative to the heating vessel (2) in a direction away from or close to the heating vessel (2), the base (32) is used to trigger or stop triggering the switch assembly.

4. The instant electric water heater with anti-dry-burning function according to claim 3, characterized in that: An annular folded edge (34) is formed at the connection point between one end of the connecting portion (33) and the outer edge of the base portion (32), and an annular deformation groove (35) is formed inside the annular folded edge (34).

5. The instant electric water heater with anti-dry-burning function according to claim 3 or 4, characterized in that: A top rod (36) is provided in the middle of the side of the base (32) away from the heating vessel (2), and the top rod (36) extends along the side away from the heating vessel (2). When the base (32) floats relative to the heating vessel (2) in a direction away from or close to the heating vessel (2), the top rod (36) is used to trigger or stop triggering the switch assembly.

6. The instant electric water heater with anti-dry-burning function according to claim 5, characterized in that: The switch assembly comprises a moving contact piece (4), a stationary contact piece (5) and a support (6); the support (6) is fixed on the outer wall of the heating chamber (2); one end of the moving contact piece (4) and one end of the stationary contact piece (5) are both fixed to the support (6); one end of the moving contact piece (4) is electrically connected to one of the wiring terminals of the electric heating component (1); one end of the stationary contact piece (5) is electrically connected to one of the output terminals of the controller; the other wiring terminal of the electric heating component (1) is electrically connected to the other output terminal of the controller; the other end of the moving contact piece (4) forms a moving contact point (41); the stationary contact piece (5) is electrically connected to the other output terminal of the controller; The other end of the contact piece (5) forms a static contact (51), and the movable contact (41) and the static contact (51) are clearance-matched; the support (6) is provided with a through hole (61), and the end of the push rod (36) away from the base (32) movably passes through the through hole (61) and abuts against the side of the movable contact (41) away from the static contact (51); when the base (32) floats relative to the heating bulb (2) in a direction away from or close to the heating bulb (2), the push rod (36) is used to push or stop pushing the contact (41) so that the movable contact (41) and the static contact (51) are in contact or disengaged.

7. The instant electric water heater with anti-dry-burning function according to claim 6, characterized in that: An annular limiting sleeve (25) is arranged on the outer wall of the heating chamber (2), the driving member (3) is arranged on the inner side of the limiting sleeve (25), an annular convex edge (37) extending outward is arranged on the other end of the connecting portion (33), an annular plug plate (62) is arranged on the side of the support (6) facing the heating chamber (2), the annular plug plate (62) is inserted into the limiting sleeve (25), and the annular convex edge (37) is pressed against the outer wall of the heating chamber (2) through the annular plug plate (62) and is tightly sealed with the outer wall of the heating chamber (2).

8. The instant electric water heater with anti-dry-burning function according to claim 7, characterized in that: An annular embedding groove (26) is provided on the outer wall of the heating tank (2), and the other end of the connecting portion (33) and the annular convex edge (37) are embedded in the annular embedding groove (26).

9. The instant electric water heater with anti-dry-burning function according to any one of claims 6 to 8, characterized in that: The outer wall of the heating chamber (2) is provided with a plurality of support columns (27) distributed at circumferential intervals, and the support columns (27) are fixed to the outer wall of the heating chamber (2) by means of screws which penetrate through the support (6) and are threadedly connected to the plurality of support columns (27) one by one.

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