Liquid Heater

Abstract

The present invention relates to the field of heaters, and discloses a liquid heater, which includes a housing, a resistance wire winding disposed within the housing, and a water inlet and a water outlet respectively provided at both ends of the housing. An energization protection device is connected to the water outlet. For the liquid heater of the present invention, when the liquid heater is used for the first time, if water is not passed through first, the drive plate is in a closed state, and the drive rod is located at a position away from the trigger mechanism, so that the trigger mechanism cannot act, thereby making the microswitch in a normally open state to cut off the power supply circuit of the resistance wire winding, thus playing a protective role. After water is passed through, the water flow enters the closed inner cavity through the water inlet and impacts the drive plate. The drive plate flips upward under the impact of the water flow to drive the movable end of the drive rod to move towards the trigger mechanism and actuate the trigger mechanism to press against the normally open microswitch, causing the microswitch to close, thereby connecting the power supply circuit of the resistance wire winding so that the resistance wire winding can be started.

Description

Technical Field

[0001] The present invention relates to the field of heaters, and particularly to liquid heaters. Background Art

[0002] A liquid heater disclosed in the invention patent with the publication number CN111278179A includes: a ceramic tube, a resistance wire winding wound around the ceramic tube, and a turbulator disposed inside the ceramic tube. When the resistance wire winding is energized to generate heat and water enters the inside of the ceramic tube, the heat exchange area is increased through the turbulator. This application solves the technical problem of low heating efficiency caused by slow heating speed.

[0003] When the above liquid heater is used for the first time, it is necessary to first pass water and then energize for heating. Otherwise, it is easy to occur the phenomenon of dry burning or even damaging the machine. Therefore, it still needs to be improved. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the present invention provides a liquid heater that must pass water first before the first use, otherwise it cannot be energized for heating, thereby ensuring the use safety.

[0005] In order to solve the above technical problems, the present invention is solved by the following technical solutions:

[0006] A liquid heater includes a housing, a resistance wire winding disposed inside the housing, and a water inlet and a water outlet respectively disposed at both ends of the housing. An energization protection device is connected to the water outlet. The energization protection device includes a housing and a closed inner cavity disposed inside the housing. An inlet is disposed on one side of the housing close to the housing and communicates with the closed inner cavity. A water outlet pipe is connected between the inlet and the water outlet. An outlet is disposed on the side of the housing away from the housing and communicates with the closed inner cavity. A driving plate with a plate surface facing the inlet is disposed inside the closed inner cavity. The upper edge of the driving plate is pivotally connected to two opposite side walls of the closed inner cavity and the rotation plane is parallel to the water inlet direction of the inlet. A driving rod is disposed at the middle position on the plate surface of the driving plate away from the inlet. The driving rod is in a bent state and the bending trajectory is consistent with the flipping trajectory of the driving plate. A through hole communicating with the closed inner cavity penetrates through the upper side wall of the housing for the movable end of the driving rod to pass through; the upper side wall of the housing is concave on the side close to the housing to form a groove. A normally open microswitch is disposed at the bottom of the groove. The microswitch is connected in series to the power supply circuit of the resistance wire winding. A trigger mechanism fixed to the side wall of the groove is disposed above the microswitch;

[0007] The energization protection device has two states:

[0008] The first state, when the plate surface of the driving plate faces the inlet, the movable end of the driving rod is away from the trigger mechanism, and the trigger mechanism is not triggered, so that the microswitch is always in an open state, thereby always cutting off the power supply circuit of the resistance wire winding;

[0009] Second state: After water flows into the water inlet, the board surface of the driving board flips towards the upper side wall of the closed inner cavity, driving the driving rod to pass through the perforation, so that the movable end of the driving rod is transferred to the triggering mechanism, causing the triggering mechanism to act and press against the microswitch, so that the microswitch is always in a closed state, thereby keeping the power supply circuit of the resistance wire winding always in a conductive state.

[0010] With the above solution, when the liquid heater is used for the first time, if water is not passed through first, the driving board is in a closed state, and the driving rod is located at a position far from the triggering mechanism, so that the triggering mechanism cannot act, thereby making the microswitch in an open state to cut off the power supply circuit of the resistance wire winding, thus playing a protective role. After water is passed through, the water flows into the closed inner cavity through the water inlet and impacts the driving board. The driving board flips upward under the impact of the water flow, driving the movable end of the driving rod to move towards the triggering mechanism and causing the triggering mechanism to act, pressing against the normally open microswitch, closing the microswitch, thereby connecting the power supply circuit of the resistance wire winding and enabling the resistance wire winding to be started.

[0011] Preferably, the triggering mechanism includes a top rod vertically arranged above the microswitch and a sleeve for the top rod to slide through and fixed to the side wall of the groove. An upper sealing plate for the upper end of the top rod to slide through is fixed to the upper port of the sleeve, and a lower sealing plate for the lower end of the top rod to slide through is fixed to the lower port of the sleeve. A sliding interval is maintained between the outer side wall of the top rod and the inner side wall of the sleeve. A convex ring slidably connected within the sliding interval is annularly arranged on the outer peripheral surface of the top rod. An elastic member is provided between the convex ring and the upper sealing plate to make the top rod tend to approach the microswitch. A sliding cavity extends from the inner cavity of the sleeve towards the side of the driving rod. The sliding cavity is arranged along the axial direction of the sleeve. A strip-shaped elastic piece is vertically arranged on the upper end surface of the convex ring on the side close to the sliding cavity. A clamping member is arranged on the end of the elastic piece far from the convex ring and on the side far from the top rod. A clamping groove for the clamping member to be clamped is provided on the side wall of the sliding cavity far from the top rod and at an upper position.

[0012] The triggering mechanism has two states:

[0013] First state: When the clamping member is clamped in the clamping groove, the convex ring and the top rod can overcome the elastic force of the elastic member and be in a state away from the microswitch, so that the microswitch is in an open state.

[0014] Second state: When the clamping member is separated from the clamping groove under the extrusion of the driving rod, the convex ring and the top rod can approach the microswitch under the elastic force of the elastic member and the end of the top rod always presses against the microswitch, so that the microswitch is always in a closed state.

[0015] With the above solution, when the clamping part is clamped in the clamping groove, the convex ring and the ejector rod can overcome the elastic force of the elastic part and be in a state away from the micro switch, so that the normally open micro switch cuts off the power supply circuit of the resistance wire winding, thus ensuring safety. When the movable end of the driving rod pushes the clamping part inward, the clamping part can be disengaged from the clamping groove, so that the convex ring and the ejector rod can approach the normally open micro switch under the elastic force of the elastic part and abut against the normally open micro switch, causing the micro switch to close and connect the power supply circuit of the resistance wire winding, so that the resistance wire winding can be started normally.

[0016] Preferably, the elastic part is a compression spring sleeved on the ejector rod. One end of the compression spring abuts against the upper sealing plate, and the other end of the compression spring abuts against the convex ring.

[0017] With the above solution, the compression spring has a simple structure, is convenient to install, and has a low maintenance cost. It can provide an effective and strong and lasting elastic supporting force for the convex ring and the ejector rod, making the action of the triggering mechanism more rapid, and at the same time, the state after the action can be maintained for a longer time.

[0018] Preferably, a sealing box communicating with the through hole for the driving rod to slide through is provided on the upper side wall of the housing. A through hole for the driving rod to slide through is opened on the upper side wall of the sealing box, and an injection pipe is provided on one side of the sealing box to inject heat-curing agent into the inner cavity of the sealing box.

[0019] With the above solution, after the triggering mechanism acts, the resistance wire winding can be started, so that the water introduced into the closed inner cavity becomes hot, and the heat can be conducted to the inner cavity of the sealing box through the housing. At this time, by injecting heat-curing agent into the sealing box through the injection pipe, the sealing box can be filled to play a preliminary sealing role for the through hole. With the continuous heat conduction, the heat-curing agent gradually solidifies to completely seal the through hole, so that the water in the closed inner cavity cannot seep out through the through hole, improving the use stability of the power-on protection device. At the same time, the solidified liquid agent can fix the driving rod, making the driving plate unable to return to its original state.

[0020] Preferably, a sealing gasket is attached to the plate surface of the driving plate away from the housing.

[0021] With the above solution, the sealing gasket can make the driving plate perform preliminary waterproof sealing on the through hole after the action, which is more user-friendly.

[0022] Preferably, a first stainless steel sheet is provided on the plate surface of the driving plate away from the housing, and a first magnetic part for magnetically adsorbing the first stainless steel sheet is provided on the upper side wall of the housing.

[0023] With the above solution, after the driving plate acts for the first time, under the magnetic attraction of the first magnetic part and the first stainless steel sheet, the plate surface of the driving plate can be kept in a state of fitting against the upper side wall of the closed inner cavity to improve the sealing performance at the through hole.

[0024] Preferably, a second stainless steel sheet is provided on the board surface of the driving board close to the outer shell and at its lower end position, and a limiting member is provided on the lower side wall of the closed inner cavity and below the driving board to abut against the board surface of the driving board close to the outer shell. A second magnetic member is provided on the side wall of the limiting member close to the driving board to magnetically adsorb the second stainless steel sheet.

[0025] With the above solution, by virtue of the magnetic adsorption between the second magnetic member and the second stainless steel sheet, the driving board can always be kept in a vertical state before being triggered, avoiding mis-triggering of the power-on protection device.

[0026] Preferably, pivot shafts extend outward from both ends of the upper edge of the driving board, pivot holes for the two pivot shafts to rotatably pass through are respectively formed in two opposite side walls of the closed inner cavity, and a sealing shaft sleeve for the pivot shafts to rotatably engage is provided outside the pivot holes.

[0027] With the above solution, both stable flipping of the driving board and sealing performance at the pivot connection of the driving board can be achieved.

[0028] Due to the adoption of the above technical solutions, the present invention has remarkable technical effects: when the liquid heater is used for the first time, if water is not passed through first, the driving board is in a closed state, and the driving rod is located at a position far from the triggering mechanism, so that the triggering mechanism cannot act, and thus the microswitch is in an open state to cut off the power supply circuit of the resistance wire winding, thereby playing a protective role. When water is passed through, the water flows into the closed inner cavity through the water inlet and impacts the driving board. The driving board flips upward under the impact of the water flow to drive the movable end of the driving rod to move towards the direction close to the triggering mechanism and make the triggering mechanism act to press the normally open microswitch, so that the microswitch closes, thereby connecting the power supply circuit of the resistance wire winding to enable the resistance wire winding to be started. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic structural diagram of the first embodiment;

[0030] Figure 2 is an exploded view of the first embodiment Figure 1 ;

[0031] Figure 3 is a schematic structural diagram of the power-on protection device in the first embodiment Figure 1 ;

[0032] Figure 4 is an exploded view of the power-on protection device in the first embodiment Figure 1 ;

[0033] Figure 5 is a schematic circuit diagram of the first embodiment;

[0034] Figure 6 is a schematic structural diagram of the power-on protection device in the first embodimentFigure 1 ;

[0035] Figure 7 is Figure 4 the enlarged schematic view of part A shown;

[0036] Figure 8 is Figure 4 the enlarged schematic view of part B shown;

[0037] Figure 9 is Figure 3 the enlarged schematic view of part C shown;

[0038] Figure 10 is Figure 6 the enlarged schematic view of part D shown;

[0039] Figure 11 is Figure 4 the enlarged schematic view of part E shown;

[0040] Figure 12 is the explosion of the first embodiment Figure 2 ;

[0041] Figure 13 is the structural schematic of the power-on protection device in the first embodiment Figure 2 ;

[0042] Figure 14 is Figure 13 the enlarged schematic view of part F shown;

[0043] Figure 15 is the explosion diagram of the second embodiment;

[0044] Figure 16 is the sectional view of the second embodiment.

[0045] The names of the parts referred to by the respective numerical labels in the above drawings are as follows: 1. Outer shell; 2. Resistance wire winding; 3. Water inlet nozzle; 4. Water outlet nozzle; 5. Power-on protection device; 6. Housing; 7. Closed inner cavity; 8. Water inlet; 9. Outlet pipe; 10. Water outlet; 11. Driving plate; 12. Driving rod; 13. Perforation; 14. Groove; 15. Microswitch; 16. Trigger mechanism; 17. Thumb rod; 18. Sleeve; 19. Upper sealing plate; 20. Lower sealing plate; 21. Sliding interval; 22. Convex ring; 23. Elastic member; 24. Sliding cavity; 25. Spring piece; 26. Clamping member; 27. Clamping groove; 28. Sealing box; 29. Penetrating hole; 30. Injection pipe; 31. Sealing gasket; 32. First stainless steel sheet; 33. First magnetic member; 34. Second stainless steel sheet; 35. Limiting member; 36. Second magnetic member; 37. Pivoting shaft; 38. Pivoting hole; 39. Sealing shaft sleeve; 40. Cover shell; 41. Lead hole; 42. Lead wire; 43. Threading hole; 44. Ceramic tube; 46. Electrode plate; 47. Turbulence member; 48. NTC sensor; 49. Snap fastener; 50. Ground wire. Specific embodiments

[0046] The present invention will be further described in detail below in conjunction with the drawings and embodiments.

[0047] Embodiment 1

[0048] As Figures 1 to 8As shown in the figure, a liquid heater disclosed in this embodiment includes a housing 1, a resistance wire winding 2 disposed inside the housing 1, and a water inlet 3 and a water outlet 4 respectively provided at both ends of the housing 1. An energization protection device 5 is connected to the water outlet 4. The energization protection device 5 includes a housing 6 and a closed inner cavity 7 disposed inside the housing 6. On one side of the housing 6 close to the housing 1, there is a water inlet 8 communicating with the closed inner cavity 7. A water outlet pipe 9 is connected between the water inlet 8 and the water outlet 4. On the side of the housing 6 far from the housing 1, there is a water outlet 10 communicating with the closed inner cavity 7. Inside the closed inner cavity 7, there is a driving plate 11 with its plate surface facing the water inlet 8. The upper edge of the driving plate 11 is pivotally connected to two opposite side walls of the closed inner cavity 7, and the rotation plane is parallel to the water inlet direction of the water inlet 8. In this embodiment, both ends of the upper edge of the driving plate 11 extend outward with pivot shafts 37. Two pivot holes 38 for the two pivot shafts 37 to rotatably pass through are respectively opened on two opposite side walls of the closed inner cavity 7. A sealing shaft sleeve 39 for the pivot shafts 37 to rotatably engage is provided outside the pivot holes 38. This can not only improve the stability of the driving plate 11 during flipping but also ensure the sealing performance at the connection between the pivot shafts 37 and the pivot holes 38 to improve the waterproof performance. On the plate surface of the driving plate 11 far from the water inlet 8 and at the middle position, there is a driving rod 12. The driving rod 12 is in a bent state and the bending trajectory is the same as the flipping trajectory of the driving plate 11. A through hole 13 communicating with the closed inner cavity 7 is penetrated through the upper side wall of the housing 6 for the movable end of the driving rod 12 to pass through. The shape and size of the through hole 13 are the same as the cross-section of the driving rod 12. The upper side wall of the housing 1 is in a concave state on the side close to the housing 1 to form a groove 14. A normally open microswitch 15 is provided at the bottom of the groove 14. The microswitch 15 is connected in series to the power supply circuit of the resistance wire winding 2. Above the microswitch 15, there is a triggering mechanism 16 fixed to the side wall of the groove 14.

[0049] In this embodiment, the energization protection device 5 has two states:

[0050] In the first state, when the plate surface of the driving plate 11 faces the water inlet 8, the movable end of the driving rod 12 is far from the triggering mechanism 16, and the triggering mechanism 16 is not triggered, so that the microswitch 15 is always in an open state, thus always cutting off the power supply circuit of the resistance wire winding 2, and further playing a protective role.

[0051] In the second state, after water passes through the water inlet 8, the plate surface of the driving plate 11 flips towards the upper side wall of the closed inner cavity 7, driving the driving rod 12 to pass through the through hole 13, so that the movable end of the driving rod 12 moves to the triggering mechanism 16, causing the triggering mechanism 16 to act and press the microswitch 15, so that the microswitch 15 is always in a closed state, and thus the power supply circuit of the resistance wire winding 2 is always kept in a conductive state.

[0052] Such as Figure 9 and Figure 10As shown in the figure, to achieve the trigger locking function of the trigger mechanism 16, the trigger mechanism 16 includes a push rod 17 vertically arranged above the microswitch 15 and a sleeve 18 through which the push rod 17 slides and is fixed to the side wall of the groove 14. An upper sealing plate 19 through which the upper end of the push rod 17 slides is fixed to the upper port of the sleeve 18, and a lower sealing plate 20 through which the lower end of the push rod 17 slides is fixed to the lower port of the sleeve 18. A sliding interval 21 is maintained between the outer side wall of the push rod 17 and the inner side wall of the sleeve 18. A convex ring 22 slidably connected within the sliding interval 21 is provided around the outer peripheral surface of the push rod 17. An elastic member 23 is provided between the convex ring 22 and the upper sealing plate 19 to make the push rod 17 tend to approach the microswitch 15. The elastic member 23 is a compression spring sleeved on the push rod 17. One end of the compression spring abuts against the upper sealing plate 19, and the other end abuts against the convex ring 22. A sliding cavity 24 extends from one side of the inner cavity of the sleeve 18 close to the driving rod 12. The sliding cavity 24 is arranged along the axial direction of the sleeve 18. A long strip-shaped stainless steel elastic sheet 25 is vertically arranged on the upper end surface of the convex ring 22 on the side close to the sliding cavity 24. A clamping member 26 is arranged on the side of the elastic sheet 25 away from the convex ring 22 and away from the push rod 17. A clamping groove 27 for the clamping member 26 to be clamped is opened on the side wall of the sliding cavity 24 away from the push rod 17 at the upper position.

[0053] In this embodiment, the trigger mechanism 16 has two states:

[0054] The first state is that when the clamping member 26 is clamped in the clamping groove 27, the convex ring 22 and the push rod 17 can overcome the elastic force of the elastic member 23 and be in a state away from the microswitch 15, so that the microswitch 15 is in an open state.

[0055] The second state is that when the clamping member 26 is disengaged from the clamping groove 27 under the extrusion of the driving rod 12, the convex ring 22 and the push rod 17 can approach the microswitch 15 under the elastic force of the elastic member 23 and the end of the push rod 17 always abuts against the microswitch 15, so that the microswitch 15 is always in a closed state.

[0056] As Figure 11 shown, to achieve the sealing of the perforation 13 and the position fixation of the driving rod 12, a sealing box 28 communicating with the perforation 13 for the driving rod 12 to slide through is provided on the upper side wall of the housing 6. A through hole 29 for the driving rod 12 to slide through is opened on the upper side wall of the sealing box 28. An injection pipe 30 is provided on one side of the sealing box 28 to inject heat-curing agent into the inner cavity of the sealing box 28.

[0057] As Figure 12 shown, to make the driving plate 11 form a seal for the perforation 13 after the initial flip, a sealing gasket 31 is attached to the plate surface of the driving plate 11 away from the housing 1. The sealing gasket 31 is preferably made of rubber and thus has better elasticity and sealing performance.

[0058] AsFigure 4 As shown, to improve the tightness between the driving plate 11 and the upper side wall of the closed inner cavity 7 after the first flip, a first stainless steel sheet 32 is provided on the plate surface of the driving plate 11 away from the housing 1, and a first magnetic member 33 for magnetically adsorbing the first stainless steel sheet 32 is provided on the upper side wall of the housing 6. The first magnetic member 33 is preferably a permanent magnet.

[0059] As Figure 13 and Figure 14 shown, to keep the plate surface of the driving plate 11 in a closed state when there is no water flow, a second stainless steel sheet 34 is provided on the plate surface of the driving plate 11 close to the housing 1 and at its lower end position, and a limiting member 35 is provided on the lower side wall of the closed inner cavity 7 and below the driving plate 11 to abut against the plate surface of the driving plate 11 close to the housing 1. A second magnetic member 36 for magnetically adsorbing the second stainless steel sheet 34 is provided on the side wall of the limiting member 35 close to the driving plate 11. The second magnetic member 36 is preferably a permanent magnet.

[0060] To ensure the safety and aesthetics of the structure of the power-on protection device 5, a cover shell 40 is buckled on the upper part of the housing 6. A lead hole 41 for the injection tube 30 to pass through and a wire passing hole 43 for the lead wire 42 of the microswitch 15 to pass through are provided through the side wall of the cover shell 40.

[0061] The specific use process is as follows:

[0062] When the liquid heater is used for the first time, if water is not supplied first, the drive plate 11 in the closed space is always in a closed state under the magnetic attraction of the second magnetic member 36 and the second stainless steel sheet 34, so that the movable end of the drive rod 12 is in a state away from the trigger mechanism 16. At this time, the engaging member 26 in the trigger mechanism 16 is engaged in the card slot 27, so that the convex ring 22 and the ejector rod 17 are in a position away from the normally open microswitch 15, thereby cutting off the power supply circuit of the resistance wire winding 2 by the microswitch 15 and ensuring safety. If it is necessary to activate the liquid heater, first water enters through the water inlet nozzle 3 of the housing 1, and then water flows out through the water outlet nozzle 4. The water outlet nozzle 4 conveys water to the water inlet 8 of the power-on protection device 5 through the water outlet pipe 9. When the water flow enters the housing 6 of the power-on protection device 5 through the water inlet 8, the water flow impacts the drive plate 11 in the closed inner cavity 7, so that the drive plate 11 overcomes the magnetic adsorption force between the second magnetic member 36 and the second stainless steel sheet 34 and flips upward. At the same time, the drive rod 12 on the drive plate 11 slides upward along the through hole 13 and the through hole 29 on the sealing box 28 until the movable end of the drive rod 12 moves along an arc trajectory to the position where the trigger mechanism 16 is located and presses the engaging member 26 against the elastic force of the elastic piece 25, so that the engaging member 26 disengages from the card slot 27, so that the convex ring 22 and the ejector rod 17 can approach the normally open microswitch 15 under the elastic force of the elastic member 23 and always press against the microswitch 15, so that the microswitch 15 is always in a closed state, and the resistance wire winding 2 of the liquid heater is always in a state where it can be started. At this time, the engaging member 26 can retract into the sliding cavity 24 under the pulling force of the elastic piece 25.

[0063] At the same time, the user can start the resistance wire winding 2 to heat the water flow passing through the liquid heater, so that the temperature of the water flow in the closed inner cavity 7 rises rapidly, and the heat can be conducted to the inner cavity of the sealing box 28 through the drive plate 11. At the same time, the user can inject a heat-curing agent (such as heat-curing epoxy resin) into the sealing box 28 through the injection tube 30 to fill the sealing box 28. As the temperature in the sealing box 28 continues to rise, the heat-curing agent gradually solidifies to seal the through hole 13 and fix the current positions of the drive rod 12 and the drive plate 11 to prevent them from detaching from the first magnetic member 33 during use.

[0064] Embodiment 2

[0065] As Figure 15 and Figure 16 shown, on the basis of Embodiment 1, a ceramic tube 44 is arranged in the housing 1. The two ends of the ceramic tube 44 are respectively communicated with the water inlet nozzle 3 and the water outlet nozzle 4. A resistance wire winding 2 is sleeved on the outer side wall of the ceramic tube 44, and electrode plates 46 are arranged at both ends of the resistance wire winding 2 to connect to an external power supply. A flow disturbing member 47 is arranged inside the ceramic tube 44. The flow disturbing member 47 can prevent the generation of air vortices and dry burning, ensure that the water can fill the chamber, and at the same time limit the flow rate and flow direction of the water.

[0066] NTC sensors 48 are provided at both the water inlet nozzle 3 and the water outlet nozzle 4. The NTC sensors 48 are fixed by snap fasteners 49, making disassembly and assembly more convenient. The NTC sensor 48 at the water inlet nozzle 3 can detect the water temperature of the incoming water. When the water temperature is below 0 °C, no water enters. The NTC sensor 48 at the water outlet nozzle 4 can detect the water temperature of the outgoing water. When the water temperature is higher than 100 °C, to avoid high fever, the resistance wire winding 2 can be controlled to stop heating, which is safer.

[0067] To improve the anti-electric leakage effect of the liquid heater, a grounding wire 50 is installed on the outer shell 1.

Claims

1. A liquid heater, comprising a housing (1), a resistance wire winding (2) disposed within the housing (1), and a water inlet nozzle (3) and a water outlet nozzle (4) respectively provided at two ends of the housing (1), characterized in that: A power-on protection device (5) is connected to the water outlet nozzle (4). The power-on protection device (5) includes a housing (6) and a closed inner cavity (7) arranged inside the housing (6). On one side of the housing (6) close to the outer shell (1), there is a water inlet (8) communicating with the closed inner cavity (7). A water outlet pipe (9) is connected between the water inlet (8) and the water outlet nozzle (4). On the side of the housing (6) away from the outer shell (1), there is a water outlet (10) communicating with the closed inner cavity (7). Inside the closed inner cavity (7), there is a driving plate (11) with its plate surface facing the water inlet (8). The upper edge of the driving plate (11) is pivotally connected to two opposite side walls of the closed inner cavity (7), and the rotation plane is parallel to the water inlet direction of the water inlet (8). On the plate surface of the driving plate (11) away from the water inlet (8) and at the middle position, there is a driving rod (12). The driving rod (12) is in a bent state, and the bending trajectory is the same as the flipping trajectory of the driving plate (11). A through hole (13) communicating with the closed inner cavity (7) penetrates through the upper side wall of the housing (6) for the movable end of the driving rod (12) to pass through; on the upper side wall of the outer shell (1) and on the side close to the outer shell (1), it is in a concave state to form a groove (14). At the bottom of the groove (14), there is a normally open microswitch (15). The microswitch (15) is connected in series to the power supply circuit of the resistance wire winding (2). Above the microswitch (15), there is a triggering mechanism (16) fixed to the side wall of the groove (14); The power-on protection device (5) has two states: The first state is that when the plate surface of the driving plate (11) faces the water inlet (8), the movable end of the driving rod (12) is away from the triggering mechanism (16), and the triggering mechanism (16) is not triggered, so that the microswitch (15) is always in an open state, thus always cutting off the power supply circuit of the resistance wire winding (2); The second state is that when water flows through the water inlet (8), the plate surface of the driving plate (11) flips towards the upper side wall of the closed inner cavity (7), driving the driving rod (12) to pass through the through hole (13), so that the movable end of the driving rod (12) moves to the triggering mechanism (16), causing the triggering mechanism (16) to act and press the microswitch (15), so that the microswitch (15) is always in a closed state, thus keeping the power supply circuit of the resistance wire winding (2) always in a conductive state.

2. The liquid heater according to claim 1, characterized in that: The trigger mechanism (16) includes a push rod (17) vertically arranged above the microswitch (15) and a sleeve (18) through which the push rod (17) slides and is fixed to the side wall of the groove (14). An upper sealing plate (19) through which the upper end of the push rod (17) slides is fixed to the upper port of the sleeve (18), and a lower sealing plate (20) through which the lower end of the push rod (17) slides is fixed to the lower port of the sleeve (18). A sliding interval (21) is maintained between the outer side wall of the push rod (17) and the inner side wall of the sleeve (18). A convex ring (22) slidably connected within the sliding interval (21) is annularly arranged on the outer peripheral surface of the push rod (17). An elastic member (23) is arranged between the convex ring (22) and the upper sealing plate (19) to make the push rod (17) tend to approach the microswitch (15). A sliding cavity (24) extends on one side of the inner cavity of the sleeve (18) close to the driving rod (12). The sliding cavity (24) is arranged along the axial direction of the sleeve (18). A strip-shaped elastic piece (25) is vertically arranged on the upper end surface of the convex ring (22) on the side close to the sliding cavity (24). A clamping member (26) is arranged at one end of the elastic piece (25) away from the convex ring (22) and on the side away from the push rod (17). A clamping groove (27) for clamping the clamping member (26) is formed in the side wall of the sliding cavity (24) away from the push rod (17) at an upper position. The trigger mechanism (16) has two states: The first state is that when the clamping member (26) is clamped in the clamping groove (27), the convex ring (22) and the push rod (17) can overcome the elastic force of the elastic member (23) and be in a state away from the microswitch (15), so that the microswitch (15) is in an off state. The second state is that when the clamping member (26) is separated from the clamping groove (27) under the extrusion of the driving rod (12), the convex ring (22) and the push rod (17) can approach the microswitch (15) under the elastic force of the elastic member (23), and the end of the push rod (17) always presses against the microswitch (15), so that the microswitch (15) is always in a closed state.

3. The liquid heater according to claim 2, wherein: The elastic member (23) is a compression spring sleeved on the push rod (17). One end of the compression spring presses against the upper sealing plate (19), and the other end of the compression spring presses against the convex ring (22).

4. The liquid heater according to claim 1, wherein: A sealing box (28) communicating with the through hole (13) for the driving rod (12) to slide through is arranged on the upper side wall of the housing (6). A through hole (29) for the driving rod (12) to slide through is formed in the upper side wall of the sealing box (28). An injection pipe (30) is arranged on one side of the sealing box (28) to inject thermosetting agent into the inner cavity of the sealing box (28).

5. The liquid heater according to claim 1, characterized in that: A sealing gasket (31) is attached to the plate surface of the driving plate (11) away from the outer shell (1).

6. The liquid heater according to claim 1, wherein: A first stainless steel sheet (32) is arranged on the plate surface of the driving plate (11) away from the outer shell (1), and a first magnetic member (33) for magnetically adsorbing the first stainless steel sheet (32) is arranged on the upper side wall of the housing (6).

7. The liquid heater according to claim 1, wherein: The board surface of the driving board (11) close to the housing (1) is provided with a second stainless steel sheet (34) at its lower end position, and a limiting member (35) is provided on the lower side wall of the closed inner cavity (7) and below the driving board (11) to abut against the board surface of the driving board (11) close to the housing (1). A second magnetic member (36) is provided on the side wall of the limiting member (35) close to the driving board (11) to magnetically adsorb the second stainless steel sheet (34).

8. The liquid heater according to claim 1, wherein: Pivoting shafts (37) extend outward from both ends of the upper edge of the driving board (11). Pivoting holes (38) for the two pivoting shafts (37) to rotatably pass through are respectively formed in two opposite side walls of the closed inner cavity (7). A sealing shaft sleeve (39) for the pivoting shafts (37) to rotatably engage with is provided outside the pivoting holes (38).

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