CN217952696U - Electric water heater capable of quickly heating - Google Patents

Abstract

The utility model provides a rapid heating electric water heater, which comprises an inner container; a flow guide pipe; the two ends of the circulating water pipe are communicated with the inner container; the first pump body is arranged on the circulating water pipe and used for driving the medium in the inner container to circularly flow through the circulating water pipe; the heat exchange piece is respectively communicated to the flow guide pipe and the circulating water pipe and is used for heat exchange of media in the flow guide pipe and the circulating water pipe; the inner heating element is arranged in the inner container; and an external heating member disposed in the circulating water pipe and upstream of the heat exchange member. The utility model discloses the interior heating member that sets up makes the heat-conducting medium that gets into circulating pipe have the uniform temperature, has this part heat-conducting medium further heating of uniform temperature through outer heating member afterwards for the temperature of the heat-conducting medium that flows to heat transfer spare is promoted by a wide margin, is favorable to carrying out the rapid heating at heat transfer spare department to the water in the honeycomb duct, can realize electric water heater's rapid heating effect.

Description

Electric water heater capable of quickly heating

Technical Field

The utility model relates to a water heater technical field especially relates to an electric water heater of rapid heating.

Background

The electric water heater, the gas water heater and the solar water heater are three common water heaters in the prior art, an electric heating pipe of a common electric water heater is arranged in the inner container, but the heat-conducting medium (usually water) in the inner container is large in volume, so that quick heating is difficult to carry out; the heating speed is increased by increasing the electric heating power and the number, which increases the cost, so how to realize the quick heating of the electric water heater is a problem to be solved at present.

SUMMERY OF THE UTILITY MODEL

In view of the deficiencies of the prior art, an object of the present invention is to provide a fast heating electric water heater, which can achieve the purpose of instant heating.

The embodiment of the utility model discloses a realize through following technical scheme:

a rapid heating electric water heater comprising:

an inner container;

a flow guide pipe;

the two ends of the circulating water pipe are communicated to the inner container;

the first pump body is arranged on the circulating water pipe and used for driving the medium in the inner container to circularly flow through the circulating water pipe;

the heat exchange piece is respectively communicated to the flow guide pipe and the circulating water pipe and is used for heat exchange of media in the flow guide pipe and the circulating water pipe;

the inner heating element is arranged in the inner container; and

and the external heating element is arranged on the circulating water pipe and is positioned at the upstream of the heat exchange element.

According to a preferred embodiment, a water outlet pipe and a water return pipe are arranged on the side wall of the inner container, the water inlet end of the circulating water pipe is communicated to the water outlet pipe, and the water outlet end of the circulating water pipe is communicated to the water return pipe; the height of the free end of the water outlet pipe is lower than that of the free end of the water return pipe; the outlet pipe is close to interior heating member one side sets up.

According to a preferred embodiment, the water outlet pipe is sleeved with a water outlet electricity-proof wall, and the water return pipe is sleeved with a water inlet electricity-proof wall; the water outlet electricity-proof wall and the water inlet electricity-proof wall penetrate through the side wall of the inner container.

According to a preferred embodiment, the water outlet pipe comprises a pipe core, and the water inlet end of the circulating water pipe is communicated to the pipe core; the free end of the tube core is provided with a first water gap; the free end of the tube core is sleeved with a buffer cap, and a plurality of water diversion grooves are uniformly distributed on the circumference of the inner wall of the buffer cap.

According to a preferred embodiment, the water dividing channel is trapezoidal in shape, with the large end of the water dividing channel facing the first nozzle.

According to a preferred embodiment, the tube core is sleeved with a buffer tube, the upper end of the buffer tube extends to the buffer cap, and the inner wall of the buffer tube is attached to the outer wall of the buffer cap; the lower end of the buffer tube extends to the water-outlet electricity-proof wall; a second water gap is arranged on the side wall of the buffer tube in a penetrating manner; a third water gap is arranged on the side wall of the tube core in a penetrating manner, and the third water gap is close to the buffer cap; the third water gap is communicated with the second water gap.

According to a preferred embodiment, the buffer tube is sleeved with a shunt tube, one end of the shunt tube extends to the water outlet electricity-proof wall, and the other end of the shunt tube extends to the second water gap; and a fourth water port is arranged on the flow dividing pipe and communicated to the second water port.

According to a preferable embodiment, the guide pipe is provided with a three-way pipe, and one passage of the three-way pipe is communicated to the inner container through a first water pipe.

According to a preferred embodiment, a float valve is communicated with the first water pipe, the control end of the float valve is communicated with the inner container through a second water pipe, and the passage end of the float valve is communicated with the inner container through a third water pipe; the free end of the third water pipe is higher than the free end of the second water pipe.

According to a preferred embodiment, a water outlet pipe and a water return pipe are arranged on the side wall of the inner container, the water outlet end of the circulating water pipe is communicated to the water outlet pipe, and the water inlet end of the circulating water pipe is communicated to the water return pipe; the height of the free end of the water outlet pipe is lower than that of the free end of the water return pipe; the outlet pipe is close to interior heating member one side sets up.

The utility model discloses technical scheme has following advantage and beneficial effect at least:

the utility model discloses the interior heating member that sets up makes the heat-conducting medium who gets into circulating pipe have the uniform temperature, has this part through outer heating member the heat-conducting medium further heating of uniform temperature afterwards for the temperature of the heat-conducting medium that flows to heat transfer spare is promoted by a wide margin, is favorable to carrying out the rapid heating at heat transfer spare department to the water in the honeycomb duct, can realize electric water heater's rapid heating effect.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on these drawings without inventive efforts.

Fig. 1 is a schematic perspective view of a rapid-heating electric water heater according to an embodiment of the present invention;

fig. 2 is a schematic cross-sectional structural diagram of a rapid heating electric water heater provided in an embodiment of the present invention;

fig. 3 is a schematic view of a first three-dimensional structure of the rapid heating electric water heater provided by the embodiment of the present invention after the housing is removed;

fig. 4 is a schematic view of a second three-dimensional structure of the rapid heating electric water heater provided by the embodiment of the present invention after the housing is removed;

fig. 5 is a schematic front view of a water outlet pipe according to an embodiment of the present invention;

FIG. 6 isbase:Sub>A schematic cross-sectional view of section A-A of FIG. 5;

FIG. 7 is an enlarged view of a portion of the structure at B in FIG. 6;

fig. 8 is a schematic cross-sectional structural diagram of another rapid heating electric water heater provided in the embodiment of the present invention;

fig. 9 is a schematic perspective view of another rapid heating electric water heater according to an embodiment of the present invention with a housing removed;

fig. 10 is a schematic view of a first three-dimensional structure of a buffer cover according to an embodiment of the present invention;

fig. 11 is a schematic diagram of a second three-dimensional structure of the buffering cover according to an embodiment of the present invention.

Icon: 11-upper shell, 111-end cover, 112-heat preservation block, 12-bottom shell, 21-inner container, 211-water outlet pipe, 2111-water outlet electricity-proof wall, 2112-buffer cap, 21121-water diversion tank, 2113-buffer pipe, 21131-second water gap, 2114-pipe core, 21141-third water gap, 21142-first water gap, 2115-shunt pipe, 21151-fourth water gap, 21152-neck, 2116-buffer cover, 21161-mounting hole, 21162-clamping flange, 212-water return pipe, 2121-water inlet electricity-proof wall, 22-heat exchange element, 23-external heating element, 24-first pump body, 25-circulating water pipe, 261-three-way pipe, 2611-first water pipe, 262-cold water outlet end, 27-overflow valve, 28-ball float valve, 281-second water pipe, 282-third water pipe, and 29-internal heating element.

Detailed Description

For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Example 1

Referring to fig. 1 to 7, a fast heating electric water heater at least includes an inner container 21, a fluid guide pipe (not shown), a circulating water pipe 25, a first pump body 24, a heat exchange member 22, an internal heating member 29 and an external heating member 23, wherein: the inner container 21 is used for containing a heat-conducting medium, and the heat-conducting medium used here is water; both ends of the circulating water pipe 25 are communicated to the liner 21, and a first pump body 24 is arranged on the circulating water pipe 25, wherein the first pump body 24 is used for driving the heat-conducting medium in the liner 21 to circularly flow through the circulating water pipe 25; the guide pipe is used for externally connecting a water source and guiding tap water or water to be heated by the quick-heating water heater when in use; the heat exchange pieces 22 are distributed in the flow guide pipe and communicated with the circulating water pipe 25 and are used for heat exchange of media in the flow guide pipe and the circulating water pipe 25; the internal heating element 29 is arranged in the inner container 21 and close to one side of the water inlet end of the circulating water pipe 25; the external heating member 23 is provided in the circulating water pipe 25 upstream of the heat exchanging member 22. Specifically, the internal heating element 29 heats the heat-conducting medium filled in the inner container 21 near the water inlet end of the circulating water pipe 25, the heated heat-conducting medium enters the circulating water pipe 25 from the water inlet end of the circulating water pipe 25 under the action of negative pressure of the first pump body 24 and circularly flows, at this time, the external heating element 23 arranged on the circulating water pipe 25 further heats the heat-conducting medium flowing through the circulating water pipe 25, the heated heat-conducting medium flows to the heat exchange element 22 and exchanges heat with water in the diversion pipe through the heat exchange element 22, specifically, the heated heat-conducting medium in the circulating water pipe 25 transfers heat to the water in the diversion pipe, and therefore the purpose of heating the water in the diversion pipe is achieved.

The inner heating element 29 is arranged close to the water inlet end of the circulating water pipe 25, so that the heat-conducting medium heated by the inner heating element 29 in the inner container 21 can preferentially participate in heat exchange circulation through the circulating water pipe 25, the heat-conducting medium entering the circulating water pipe 25 has a certain temperature, and then the heat-conducting medium with the certain temperature is further heated through the outer heating element 23, so that the temperature of the heat-conducting medium flowing to the heat exchange element 22 is greatly increased, the water in the flow guide pipe is rapidly heated at the heat exchange element 22, and even the instant heating (the heat-conducting medium in the inner container 21 is large in volume, and the heat-conducting medium in the circulating water pipe 25 is small in volume) can be realized, so that the duration for directly heating the heat-conducting medium in the inner container 21 is far longer than the duration for heating the heat-conducting medium in the pipe at the circulating water pipe 25 when the heat-conducting medium in the circulating water pipe 25 reaches the same temperature at the heat exchange element 22, and the waiting time of a user is greatly reduced; meanwhile, the outer heating element 23 is arranged on the outer side of the inner container 21, so that the outer heating element 23 is convenient to overhaul, the working efficiency is improved, and the electric water heater is higher in reliability (the electric water heater can still be used when the electric water heater is damaged by the inner heating element 29 and the outer heating element 23 in a matched mode); and through using heat transfer spare 22 to transfer the heat, the heat-conducting medium in the inner bag 21 is nearly lossless, consequently can fill deionized water in the inner bag 21 in practice, and the incrustation scale can be avoided in the inner bag 21 to the deionized water, and is simultaneously insulating, in case also can prevent the electric leakage when interior heating element 29 and outer heating element 23 appear damaging, and the security is high.

In this embodiment, the heat exchange member 22 is preferably a flat plate heat exchanger.

In this embodiment, the internal heating element 29 may be a submersible nichrome resistance wire heating tube. The external heating member 23 is a water heater.

Further, as shown in fig. 2 and fig. 3, a water outlet pipe 211 and a water return pipe 212 are arranged on the side wall of the inner container 21, a water inlet end of the circulating water pipe 25 is communicated to the water outlet pipe 211, and a water outlet end of the circulating water pipe 25 is communicated to the water return pipe 212; the free end of the outlet pipe 211 has a height lower than that of the return pipe 212. In this embodiment, the free end of the water outlet pipe 211 is set to be lower in height, so that the heat-conducting medium stored in the inner container 21 can enter the circulating water pipe 25 through the water outlet pipe 211. When in use, the heat-conducting medium enters the circulating water pipe 25 from the water inlet end of the circulating water pipe 25 through the water outlet pipe 211, flows through the external heating element 23 to be heated, enters the heat exchange element 22 through the circulating water pipe 25 to be subjected to heat transfer, then enters the water return pipe 212 from the water outlet end of the circulating water pipe 25 through the circulating water pipe 25, and flows back to the inner container 21. In this embodiment, the water outlet end of the water return pipe 212 is disposed at the free end thereof, and the water return pipe 212 extends to the top of the inner wall of the inner container 21, so that when the heat-conducting medium flows back to the inner container 21, the impact on the scale deposited at the bottom of the inner container 21 is reduced, the probability of the scale participating in circulation through the water outlet pipe 211 can be reduced, the probability of water path blockage can be effectively reduced, and the service life of the first pump body 24, the outer heating element 23 and the heat exchange element 22 can be prolonged.

As shown in fig. 3, the water outlet pipe 211 is sleeved with a water outlet electricity-proof wall 2111, and the water return pipe 212 is sleeved with a water inlet electricity-proof wall 2121; the water outlet electricity-proof wall 2111 and the water inlet electricity-proof wall 2121 penetrate through the side wall of the liner 21. The water inlet electricity-proof wall 2121 and the water outlet electricity-proof wall 2111 are both made of insulating materials, and the water outlet electricity-proof wall 2111 is used for sealing the side wall of the water outlet pipe 211 and the inner container 21 so as to prevent water seepage and electricity leakage; the water inlet electricity-proof wall 2121 is used for sealing the water return pipe 212 and the side wall of the liner 21 to prevent water seepage and electricity leakage. Preferably, the water outlet electricity-proof wall 2111 and the water inlet electricity-proof wall 2121 are both made of rubber.

In this embodiment, as shown in fig. 5 to 7, the water outlet pipe 211 includes a pipe core 2114, and a water inlet end of the circulating water pipe 25 is communicated to the pipe core 2114; the free end of the core 2114 is provided with a first water gap 21142; a buffer cap 2112 is sleeved outside the free end of the tube core 2114, and a plurality of water diversion grooves 21121 are uniformly distributed on the circumference of the inner wall of the buffer cap 2112. In this embodiment, the heat-conducting medium in the inner container 21 enters the tube core 2114 through the first water gap 21142, and the water diversion groove 21121 provided on the buffer cap 2112 is used for partitioning the heat-conducting medium, so that the heat-conducting medium can enter the tube core 2114 in a stable and mild state, and the safety is high. Further, the diversion trench 21121 has a trapezoidal shape, and a large end of the diversion trench 21121 faces the first nozzle 21142. When in use, when the heat-conducting medium flows through the diversion trench 21121, the flow passage area is small and the flow velocity is large when the heat-conducting medium passes through the small end of the diversion trench 21121; when the flow reaches the first water gap 21142 and is close to the large end of the water diversion groove 21121, the flow passage area is large, the flow speed is low, and the flow speed of the heat-conducting medium can be effectively reduced. Meanwhile, the heat-conducting medium enters the buffer cap 2112 from the water distribution tank 21121 from bottom to top, is buffered under the action of the inner wall of the buffer cap 2112, changes the flow direction, and enters the tube core 2114 from the first water gap 21142 from top to bottom, so that the heat-conducting medium entering the tube core 2114 can be further buffered, the flow state of the heat-conducting medium entering the tube core 2114 is stable and stable, and the heat-conducting medium can be fully and uniformly heated by the outer heating element 23.

In this embodiment, a buffer tube 2113 is sleeved outside the tube core 2114, the upper end of the buffer tube 2113 extends to the buffer cap 2112, and the inner wall of the buffer tube 2113 is attached to the outer wall of the buffer cap 2112; the lower end of the buffer tube 2113 extends to the effluent electricity-proof wall 2111; a second water gap 21131 is formed through a side wall of the buffer tube 2113; a third water gap 21141 is arranged on the side wall of the tube core 2114 in a penetrating mode, and the third water gap 21141 is close to the buffer cap 2112; the third port 21141 communicates with the second port 21131. The second water gaps 21131 are provided with a plurality of water gaps, and are uniformly distributed on the peripheral side of the buffer tube 2113, so that on one hand, the heat-conducting medium can be guided to the third water gaps 21141 and the water diversion grooves 21121; on the other hand, the heat-conducting medium can be shunted so that the flowing state of the heat-conducting medium is smooth; furthermore, the second plurality of nozzles 21131 may provide a filtering function, preventing large volumes of scale or contaminants from entering the tube core 2114.

In this embodiment, the diameter of the second nozzle 21131 is 1-3mm. Preferably, the second nozzle 21131 has a diameter of 2mm.

In this embodiment, a shunt tube 2115 is sleeved outside the buffer tube 2113, one end of the shunt tube 2115 extends to the water outlet electricity-proof wall 2111, and the other end extends to the second water gap 21131; the dividing pipe 2115 is provided with a fourth nozzle 21151, and the fourth nozzle 21151 communicates with the second nozzle 21131. In this embodiment, when in use, the heat-conducting medium in the inner container 21 sequentially passes through the fourth water gap 21151, the second water gap 21131, the third water gap 21141 and the tube core 2114; or the heat-conducting medium sequentially passes through the fourth water gap 21151, the second water gap 21131, the water diversion groove 21121 and the first water gap 21142 to the tube core 2114; through the reposition of redundant personnel and the buffering of a plurality of mouths of a river, can make the heat-conducting medium velocity of flow that gets into tube core 2114 mild to can be abundant and the thermally equivalent when making heat-conducting medium reach outer heating element 23 position department, the security is high.

In this embodiment, the flow guiding tube is provided with a three-way pipe 261, and one of the passages of the three-way pipe 261 is communicated to the liner 21 through a first water pipe 2611. As shown in fig. 3, a three-way pipe 261 is disposed at the cold water inlet end of the heat exchange member 22, the three-way pipe 261 is used for communicating the draft tube with the cold water inlet end of the heat exchange member 22, a cold water outlet end 262 is further disposed on the heat exchange member 22, and the cold water outlet end 262 is connected to a terminal such as a shower head or a water faucet for a user to use. And one of the passages of the three-way pipe 261 is used for guiding the external water source to the inner container 21 through the first water pipe 2611. In this scheme, the heat-conducting medium in the inner container 21 is tap water, and is in the same source as the water entering the heat exchange member 22 and heated. Further, a float valve 28 is communicated with the first water pipe 2611, a control end of the float valve 28 is communicated with the inner container 21 through a second water pipe 281, and a passage end of the float valve 28 is communicated with the inner container 21 through a third water pipe 282; the free end of the third water pipe 282 is higher than the free end of the second water pipe 281. When the water heater is used, the heat-conducting medium in the liner 21 is continuously consumed after being heated, when the amount of the heat-conducting medium in the liner 21 is less than a set value, the water level entering the ball float valve 28 through the second water pipe 281 is reduced, the ball float valve 28 is opened, one part of water passing through the guide pipe enters the heat exchange piece 22 through the three-way pipe 261, the other part of water passes through the three-way pipe 261 and enters the first water pipe 2611, and then enters the liner 21 through the third water pipe 282 to supplement the heat-conducting medium. When the heat transfer medium in the inner container 21 is replenished to a certain amount, the water level entering the float valve 28 through the second water pipe 281 rises, and the float valve 28 is closed. Here, the float valve 28 is fixedly mounted on the inner container 21 by bolts.

In this embodiment, the float valve 28 is a mechanical float valve 28.

In this embodiment, the inner container 21 is sleeved with a housing, and the first pump body 24, the heat exchange member 22 and the external heating member 23 are all disposed between the inner container 21 and the housing. The housing herein includes an upper case 11 and a lower case, and the lower case is fixedly mounted to the upper case 11 by screws or bolts. End caps 111 are fastened to both ends of the upper case 11 to form a closed space.

In this embodiment, a heat insulation block 112 is disposed between the end cover 111 and the inner container 21. The thermal insulating block 112 is made of foam. Which is filled in the space between the end cap 111 and the inner container 21.

In this embodiment, a relief valve 27 is disposed at the top of the inner container 21, and the relief valve 27 is communicated with the inside of the inner container 21.

Example 2

This embodiment is an improvement of embodiment 1, and repeated contents are not described again.

Referring to fig. 5, 8, 9, 10 and 11, in the present embodiment, a water outlet pipe 211 and a water return pipe 212 are disposed on a side wall of the inner container 21, a water outlet end of the circulating water pipe 25 is communicated to the water outlet pipe 211, and a water inlet end of the circulating water pipe 25 is communicated to the water return pipe 212; the height of the free end of the water outlet pipe 211 is lower than that of the free end of the water return pipe 212; the water outlet pipe 211 is arranged close to one side of the internal heating element 29.

In this embodiment, the circulation flow path of the heat transfer medium is: under the action of the first pump body 24, the heat-conducting medium enters the water return pipe 212 from the free end of the water return pipe 212, flows to the water inlet end of the circulating water pipe 25 and enters the circulating water pipe 25, then the part of the heat-conducting medium flows through the external heating element 23 and heats the external heating element, then the part of the heated heat-conducting medium flows to the heat exchange element 22, heat is transferred to water in the flow guide pipe, then the heat-conducting medium continuously flows through the first pump body 24 to the water outlet end of the circulating water pipe 25 through the circulating water pipe 25 and enters the water outlet pipe 211 from the water outlet end of the circulating water pipe 25 to flow back to the inner container 21, and a heat exchange cycle is completed. In this embodiment, after the heat-conducting medium is heated by the inner heating element 29 in the inner container 21, the heated part of the heat-conducting medium rises to the upper side of the liquid level in the inner container 21, and the height of the free end (water inlet end) of the set water return pipe 212 is higher than that of the free end (water outlet end) of the water outlet pipe 211, so that the high-temperature heat-conducting medium on the upper layer of the liquid level preferentially enters the water return pipe 212 to participate in heat exchange circulation, thereby ensuring that the heat-conducting medium flowing to the outer heating element 23 has a certain amount of heat transferred by the inner heating element 29, and being capable of rapidly raising the temperature under the action of the outer heating element 23. Meanwhile, the water outlet pipe 211 and the inner heating element 29 are close to each other, and part of the heat-conducting medium which flows back to the inner container 21 through the circulating water pipe 25 and the water outlet pipe 211 impacts the heat-conducting medium at the position, so that the heat-conducting medium in the whole inner container 21 can be quickly and uniformly mixed, the temperature difference at each position is small, and the heat-conducting medium in the inner container 21 is favorably and uniformly heated.

Further, a buffering cover 2116 is sleeved outside the shunt tube 2115. In this embodiment, a mounting hole 21161 is opened at the closed end of the buffer cover 2116, and a snap-fit flange 21162 is provided at the edge of the mounting hole 21161. In use, as shown in fig. 5 and 8, the shunt tube 2115 is nested in the buffer cover 2116 through the mounting hole 21161, the outer wall of the shunt tube 2115 is provided with a clamping groove 21152, and the clamping flange 21162 is clamped in the clamping groove 21152, so that the buffer cover 2116 is fixedly mounted. Specifically, the heat-conducting medium enters the tube core 2114 through the water outlet end of the circulating water pipe 25, then enters the gap between the tube core 2114 and the buffer tube 2113 through the third water port 21141, and then flows back to the region in the buffer cover 2116 in the liner 21 through the second water port 21131 and the fourth water port 21151, and the buffer cover 2116 can effectively reduce the flow rate of the heat-conducting medium, so that the liquid level in the water tank is in a substantially stable state.

In this embodiment, the inner wall of the buffering cap 2112 may not be provided with the water diversion groove 21121.

The technical means disclosed by the scheme of the present invention is not limited to the technical means disclosed by the above embodiments, but also includes the technical scheme formed by combining the above technical features at will. It should be noted that modifications and embellishments may be made by those skilled in the art without departing from the principles of the present invention and are considered within the scope of the invention.

Claims (10)

1. An electric water heater for rapid heating, comprising:

an inner container;

a flow guide pipe;

the two ends of the circulating water pipe are communicated to the inner container;

the first pump body is arranged on the circulating water pipe and used for driving the medium in the inner container to circularly flow through the circulating water pipe;

the heat exchange piece is respectively communicated to the flow guide pipe and the circulating water pipe and is used for heat exchange of media in the flow guide pipe and the circulating water pipe;

the inner heating element is arranged in the inner container; and

and the external heating element is arranged on the circulating water pipe and is positioned at the upstream of the heat exchange element.

2. The rapid-heating electric water heater according to claim 1, wherein a water outlet pipe and a water return pipe are arranged on the side wall of the inner container, the water inlet end of the circulating water pipe is communicated to the water outlet pipe, and the water outlet end of the circulating water pipe is communicated to the water return pipe;

the height of the free end of the water outlet pipe is lower than that of the free end of the water return pipe;

the outlet pipe is close to interior heating member one side sets up.

3. The rapid-heating electric water heater according to claim 2, wherein the water outlet pipe is sleeved with a water outlet electricity-proof wall, and the water return pipe is sleeved with a water inlet electricity-proof wall;

the water outlet electricity-proof wall and the water inlet electricity-proof wall both penetrate through the side wall of the inner container.

4. The rapid-heating electric water heater according to claim 3, wherein the water outlet pipe comprises a pipe core, and the water inlet end of the circulating water pipe is communicated to the pipe core;

the free end of the tube core is provided with a first water gap;

the free end of the tube core is sleeved with a buffer cap, and a plurality of water diversion grooves are uniformly distributed on the circumference of the inner wall of the buffer cap.

5. The rapid heating electric water heater according to claim 4, wherein the water diversion trench is trapezoidal in shape with a large end facing the first water gap.

6. The rapid-heating electric water heater according to claim 5, wherein the tube core is externally sleeved with a buffer tube, the upper end of the buffer tube extends to the buffer cap, and the inner wall of the buffer tube is attached to the outer wall of the buffer cap; the lower end of the buffer tube extends to the water-outlet electricity-proof wall;

a second water gap is arranged on the side wall of the buffer tube in a penetrating manner;

a third water gap is arranged on the side wall of the tube core in a penetrating manner, and the third water gap is close to the buffer cap; the third port is in communication with the second port.

7. The rapid-heating electric water heater according to claim 6, wherein the buffer tube is sleeved with a shunt tube, one end of the shunt tube extends to the water outlet electricity-proof wall, and the other end of the shunt tube extends to the second water gap;

and a fourth water port is arranged on the flow dividing pipe and communicated to the second water port.

8. The rapid heating electric water heater according to claim 1, wherein the flow guiding tube is provided with a three-way pipe, and one passage of the three-way pipe is communicated to the inner container through a first water pipe.

9. The rapid heating electric water heater according to claim 8, wherein a ball float valve is connected to the first water pipe, a control end of the ball float valve is connected to the inner container through a second water pipe, and a passage end of the ball float valve is connected to the inner container through a third water pipe;

the free end of the third water pipe is higher than the free end of the second water pipe.

10. The rapid-heating electric water heater according to claim 1, wherein a water outlet pipe and a water return pipe are arranged on the side wall of the inner container, the water outlet end of the circulating water pipe is communicated to the water outlet pipe, and the water inlet end of the circulating water pipe is communicated to the water return pipe;

the height of the free end of the water outlet pipe is lower than that of the free end of the water return pipe;

the outlet pipe is close to interior heating member one side sets up.

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