CN215909452U

CN215909452U - Electric heating device and electric water heater

Info

Publication number: CN215909452U
Application number: CN202121132910.7U
Authority: CN
Inventors: 李勇; 王军; 赵小勇; 苏进; 马腾; 赵龙; 杜方林
Original assignee: Wuhan Haier Water Heater Co Ltd; Haier Smart Home Co Ltd; Qingdao Economic and Technological Development Zone Haier Water Heater Co Ltd
Current assignee: Wuhan Haier Water Heater Co Ltd; Haier Smart Home Co Ltd; Qingdao Economic and Technological Development Zone Haier Water Heater Co Ltd
Priority date: 2021-05-25
Filing date: 2021-05-25
Publication date: 2022-02-25
Anticipated expiration: 2031-05-25

Abstract

The utility model discloses an electric heating device and an electric water heater, wherein the electric heating device comprises: the flange plate is provided with a first mounting hole and two second mounting holes; the electric heating pipe is inserted into the first mounting hole in a sealing manner; the water outlet pipe is hermetically inserted into one of the second mounting holes; the water inlet pipe is inserted into the other second mounting hole in a sealing manner, and a plurality of water outlet holes are formed in the pipe wall of the water inlet pipe along the length direction; and the water return cover is arranged above the water inlet pipe and covers the water outlet hole. The hot water output rate of the electric water heater is improved.

Description

Electric heating device and electric water heater

Technical Field

The utility model belongs to the technical field of household appliances, and particularly relates to an electric heating device and an electric water heater.

Background

At present, water heaters are household appliances commonly used in daily life of people, and the water heaters are divided into electric water heaters and gas water heaters according to different heating sources. The electric water heater is widely used due to the convenient installation. The electric water heater generally includes an inner container and an electric heater, the electric heater is disposed in the inner container to heat water in the inner container through the electric heater, and meanwhile, the inner container is additionally connected with a water inlet pipe and a water outlet pipe.

Chinese patent publication No. CN 207610411U discloses an electric water heater, in which a water pipe and an electric heating pipe are both mounted on a flange plate for fixing. Because water pipe and electric heating pipe transversely arrange in the inner bag, the length of inner bag is greater than the height of inner bag, and the cold water that the water pipe entered into in the inner bag can influence the hot water on inner bag upper strata great, and then leads to hot water output rate lower.

In view of this, how to design an electric water heater for increasing the output rate of hot water is a technical problem to be solved by the present invention.

SUMMERY OF THE UTILITY MODEL

The utility model provides an electric heating device and an electric water heater, which can improve the hot water output rate of the electric water heater.

In order to achieve the technical purpose, the utility model adopts the following technical scheme:

in one aspect, the present invention provides an electrical heating apparatus comprising:

the flange plate is provided with a first mounting hole and two second mounting holes;

the electric heating pipe is inserted into the first mounting hole in a sealing manner;

the water outlet pipe is hermetically inserted into one of the second mounting holes;

the water inlet pipe is inserted into the other second mounting hole in a sealing manner, and a plurality of water outlet holes are formed in the pipe wall of the water inlet pipe along the length direction;

and the water return cover is arranged above the water inlet pipe and covers the water outlet hole.

Furthermore, the longitudinal section of the water return cover is of an inverted U-shaped structure, a semicircular structure or an inverted V-shaped structure.

Furthermore, the water return cover is characterized by further comprising a limiting block, and the water inlet pipe is clamped between the limiting block and the water return cover.

Furthermore, the upper surface of stopper is provided with positioning groove, the inlet tube card is in positioning groove.

Furthermore, the limiting block is clamped on the water return cover.

Further, the method also comprises the following steps: and the connecting positioning piece is connected between the electric heating pipe and the water inlet pipe and between the water outlet pipes.

Furthermore, the connecting and positioning part comprises a first connecting piece and a second connecting piece, a first clamping groove is formed in the first connecting piece, and a second clamping groove and a third clamping groove are formed in the second connecting piece;

the first connecting piece is arranged on the water return cover, the first clamping groove is clamped on the water outlet pipe, the second clamping groove is clamped on the water outlet pipe, and the third clamping groove is clamped on the electric heating pipe.

Furthermore, the electric heating device comprises a plurality of electric heating pipes, a plurality of third clamping grooves are arranged on the second connecting piece, and the third clamping grooves are clamped on the corresponding electric heating pipes.

Furthermore, a first connecting pipe orifice is formed in the water inlet end part of the water inlet pipe, which extends out of the outer surface of the flange plate; and a second connecting pipe orifice is arranged at the water outlet end part of the water outlet pipe extending out of the outer surface of the flange plate.

The utility model also provides an electric water heater, which comprises a shell and an inner container, wherein the inner container is arranged in the shell, and the electric water heater also comprises the electric heating device, and the electric heating device is arranged on the inner container.

Compared with the prior art, the utility model has the advantages and positive effects that: the water pipe and the electric heating pipe are both arranged on a flange plate, so that the water pipe and the electric heating pipe are simultaneously assembled on the inner container through the flange plate, the water inlet pipe is transversely arranged in the inner container, and the water returning cover is arranged on the water inlet pipe to block the water input into the inner container by the water inlet pipe; after water is output from the water outlet hole formed in the pipe wall of the water inlet pipe, the water flows towards the bottom of the inner container under the action of the water return cover, so that the influence of cold water on a hot water layer above the inner container is reduced, and the hot water output rate of the electric water heater is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an embodiment of an electric heating apparatus according to the present invention;

FIG. 2 is a second schematic structural diagram of an embodiment of an electric heating apparatus according to the present invention;

FIG. 3 is a cross-sectional view of one embodiment of an electric heating apparatus of the present invention;

FIG. 4 is a schematic partial structure view of an electric heating apparatus according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a second connecting member in an embodiment of the electric heating apparatus of the present invention;

FIG. 6 is a schematic structural view of an embodiment of a liner assembly according to the present invention;

FIG. 7 is a partial exploded view of one embodiment of the liner assembly of the present invention;

FIG. 8 is a partial cross-sectional view of one embodiment of the liner assembly of the present invention;

FIG. 9 is a schematic structural view of a first flange in an embodiment of a liner assembly of the present invention;

FIG. 10 is a schematic structural view of a second flange in an embodiment of the liner assembly of the present invention;

fig. 11 is a schematic structural diagram of an electric water heater according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In a first embodiment, as shown in fig. 1 to 5, the present embodiment provides an electric heating apparatus, including:

the flange plate 100, the flange plate 100 is provided with a first mounting hole (not marked) and a second mounting hole (not marked);

the electric heating pipe 200, the electric heating pipe 200 is sealed and inserted in the first mounting hole;

the water pipe 300, the water pipe 300 includes the inlet pipe 301 and outlet pipe 302, the inlet pipe 301 and outlet pipe 302 are sealed and inserted in the corresponding second mounting hole respectively, there are a plurality of apopores 3011 on the pipe wall of the inlet pipe 301 along the length direction;

the water return cover 500 is arranged above the water inlet pipe 301, and the water return cover 500 covers the water outlet hole 3011.

Specifically, the electric heating device is mounted on the inner container through the flange plate in the using process, and the water pipe 300 and the electric heating pipe 200 are both positioned in the inner container. The water inlet pipe 301 is to be arranged laterally along the bottom of the inner container, and the water inlet pipe 301 can deliver cold water to the bottom area of the inner container through the plurality of water outlet holes 3011, so that the hot water at the top area of the inner container is output from the water outlet pipe 302.

In the process of inputting cold water into the inner container through the water outlet hole 3011, the cold water output from the water outlet hole 3011 is limited and blocked by the water returning cover 500 and cannot directly flow upwards, and under the action of the water returning cover 500, the cold water output from the water outlet hole 3011 is blocked by the water returning cover 500 and flows towards the lower part of the inner container, so that the influence of the cold water input by the water inlet pipe 301 on a hot water layer on the upper part of the inner container is reduced, and the hot water output rate is improved.

In one embodiment, the water returning cover 500 is configured to cover the water outlet holes 3011 disposed on the water inlet pipe 301, and for this purpose, the longitudinal section of the water returning cover 500 is an inverted U-shaped structure, a semicircular structure, or an inverted V-shaped structure.

Specifically, taking the water returning cover 500 as an example of a U-shaped structure, two side walls of the water returning cover 500 are disposed on two sides of the water inlet pipe 301, and the top wall of the water returning cover 500 covers the water inlet pipe 301, so that the water output from the water outlet hole 3011 of the water inlet pipe 301 is restricted from flowing downward by the top wall and the two side walls of the water returning cover 500.

In another embodiment, in order to install and fix the water return cover 500 on the water inlet pipe 301, the electric heating apparatus further includes a stopper 600, and the water inlet pipe 301 is sandwiched between the stopper 600 and the water return cover 500.

Specifically, in the actual assembly process, place inlet tube 301 between stopper 600 and return water cover 500, then, be connected stopper 600 and return water cover 500 to the realization will return water cover 500 installation to be fixed on inlet tube 301.

Wherein, in order to improve the assembly efficiency, the stopper 600 is clamped on the water return cover 500. The mode that the limiting block 600 and the water returning cover 500 are clamped can adopt various structural forms, for example: the limiting block 600 is provided with a clamping groove, the inner wall of the water returning cover 500 is provided with a clamping jaw, and the clamping jaw is clamped in the clamping groove.

In addition, a positioning groove (not shown) is provided on an upper surface of the stopper 600, and the water inlet pipe 301 is caught in the positioning groove. Specifically, during assembly, the water inlet pipe 301 is placed in the positioning groove of the limiting block 600 to be positioned, and then the water return cover 500 is covered on the water inlet pipe 301 and is clamped and matched with the limiting block 600 below.

In the second embodiment, since the electric heating tube 200 and the water tube 300 are suspended in the inner container, in order to improve the overall structural strength, the electric heating apparatus further includes a connecting and positioning member 400, and the connecting and positioning member 400 is connected between the electric heating tube 200, the water inlet tube 301 and the water outlet tube 302.

Specifically, in the actual assembly process, the electric heating pipe 200 and the water pipe 300 are both suspended and fixedly mounted on the flange plate 100, and the connection portions of the electric heating pipe 200, the water pipe 300 and the flange plate 100 are both in a sealing connection manner. Like this for electric heating pipe 200 and water pipe 300 are integrated to be installed on same ring flange 100, and when needs and inner bag equipment, only need with ring flange 100 seal fixed mounting on the inner bag, alright with the equipment in order to accomplish electric heating pipe 200 and water pipe 300, greatly reduced on-the-spot assembly process.

Wherein, electric heating pipe 200, inlet tube 301 and outlet pipe 302 in the electric heating device package are connected through connecting locating piece 400, like this, alright in order to make water pipe 300 and electric heating pipe 200 interconnect. And then many unsettled body are connected structure as an organic whole to effectual improvement holistic structural strength, and then reduce in the transportation, because of external factors influence such as vibration leads to body bending deformation.

In some embodiments, the connection positioning element includes a first connection element 401 and a second connection element 402, a first card slot 4011 is disposed on the first connection element 401, and a second card slot 4021 and a third card slot 4022 are disposed on the second connection element 402; the first connector 401 is arranged on the water returning cover 500, the first clamping groove 4011 is clamped on the water outlet pipe 302, the second clamping groove 4021 is clamped on the water outlet pipe 302, and the third clamping groove 4022 is clamped on the electric heating pipe 200.

Specifically, the first connector 401 is fixedly mounted on the water returning cover 500, and the first connector 401 is connected to the water outlet pipe 302 through the first clamping groove 4011, so that the water inlet pipe 301 and the water outlet pipe 302 are connected to each other. The second connector 402 is clamped on the water inlet pipe 301 through the second clamping groove 4021, and the second connector 402 is also clamped on the electric heating pipe 200 through the third clamping groove 4022, so that the electric heating pipe 200, the water inlet pipe 301 and the water outlet pipe 302 are connected together.

In some embodiments, the electric heating apparatus includes a plurality of electric heating pipes 200, and a plurality of third latching grooves 4022 are disposed on the second connector 402, and the third latching grooves 4022 latch on the corresponding electric heating pipes 200. Specifically, in order to improve the heating efficiency, a plurality of electric heating pipes 200 may be provided, and the plurality of electric heating pipes 200 are connected to the second connecting member 402, so as to realize the connection between the plurality of electric heating pipes 200 and also connect the water inlet pipe 301 and the water outlet pipe 302 to each other.

The number of the first connector 401 and the second connector 402 can be set as required to ensure that the water inlet pipe 301 and the water outlet pipe 302 are connected with the electric heating pipe 200.

For the arrangement of the pipeline, the electric heating pipes 200 adopt a circuitous pipe structure, two ends of the electric heating pipe 200 are fixed on the flange plate 100, and meanwhile, the water inlet pipe 301 and the water outlet pipe 302 can be arranged between two adjacent electric heating pipes 200, so that the first connecting piece 401 and the second connecting piece 402 are arranged in a crossed manner.

In another embodiment, the water inlet end of the water inlet pipe 301 extending to the outer surface of the flange plate 100 is provided with a first connecting pipe port 303; the water outlet end of the water outlet pipe 302 extending out of the outer surface of the flange plate 100 is provided with a second connecting pipe orifice 304.

Specifically, for inlet tube 301 and outlet pipe 302, for the convenience later stage be connected with the pipeline in the user's family, then can set up first connection mouth of pipe 303 and second connection mouth of pipe 304 at the surface of ring flange 100, first connection mouth of pipe 303 and second connection mouth of pipe 304 can be connected the needs according to later stage pipeline and dispose the screw hole or dispose the external screw thread.

In one embodiment, to increase the hot water output rate, the water inlet end of the water outlet pipe 302 is bent and extended upward.

Specifically, after the water in the inner container is heated, the hot water rises to the upper area of the inner container due to the small specific gravity, and the water inlet end of the water outlet pipe 302 is bent upwards and extends to the top area of the inner container, so that the hot water output rate can be effectively improved.

In a third embodiment, as shown in fig. 6 to 10, the present embodiment further provides a liner assembly, including:

the liner comprises a liner body 1, a liner body and a liner body, wherein the liner body is made of a plastic material and is provided with a mounting opening 11;

an electric heating device 2, which adopts the electric heating device in the first embodiment;

an intermediate connector 3 formed with an insertion portion and a mounting portion;

wherein, the embedding part is embedded in the mounting opening 11, the flange plate of the electric heating device 2 is arranged on the mounting part, and the water pipe and the electric heating pipe of the electric heating device 2 extend into the liner body 1.

Specifically, the liner body 1 adopted in the electric heating device of the present embodiment is made of a plastic material, and regarding the specific processing manner of the liner body 1, reference may be made to the processing manner of a conventional electric heating device, which is not limited and described herein.

During the process of the liner body 1, the embedded part of the middle connecting piece 3 is integrally formed in the mounting opening 11 on the liner body 1, so that the middle connecting piece 3 is connected to the liner body 1. In this way, the electric heating device 2 can be installed and fixed through the installation part on the intermediate connecting piece 3, so as to realize the installation and fixation of the electric heating device 2 on the liner body 1.

Compare the mode that adopts the panel beating head among the prior art to realize electric heater's installation, electric heater unit in this embodiment only need imbed intermediate junction spare 3 alright in the installing port 11 of the courage body 1 with the installation requirement that satisfies electric heater unit 2 for the whole plastics material that adopts of courage body 1 is made, and the blowing of the courage body 1 is formed on intermediate junction spare 3, in order to reduce the use amount of sheet metal component, and then effectual reduction weight, and simultaneously, also can reduce manufacturing cost.

For the representation entity of the electric heating device 2, an electric heater in a conventional electric water heater may be used, for example, an electric heating tube is used to realize the energization heating, and the electric heating tube is fixedly connected to the mounting portion of the intermediate connecting member 3 through a mounting plate. Here, the specific structural form and assembly manner of the electric heating device 2 are not limited or described in detail.

In an embodiment, the intermediate connector 3 comprises a first flange 31 and a second flange 32, the first flange 31 being embedded in the mounting opening 11 and forming said embedding, the second flange 32 being screwed onto the first flange 31, the second flange 32 forming said mounting.

Specifically, the intermediate connecting member 3 is formed by two flanges, wherein the first flange 31 is integrally embedded in the mounting opening 11 of the container body 1 during the processing of the container body 1, so that the first flange 31 and the container body 1 form an integral structure. The second flange 32 is mounted on the first flange 31 by means of screw connection, the second flange 32 is used for mounting and fixing a flange of the electric heating device 2, and the flange can also be matched and connected with the second flange 32 by means of flange.

Adopt two flanges to constitute intermediate junction spare 3, on the one hand conveniently with the independent embedding of first flange 31 in installing port 11 when the plastify shaping of the courage body 1 to the machine-shaping of the face courage body 1, on the other hand, second flange 32 threaded connection is on first flange 31, and the installation terminal surface of second flange 32 is located the outside of the courage body 1, and then makes things convenient for operating personnel to be with electric heater unit 2 fixed mounting on second flange 32.

In some embodiments, in order to facilitate the threaded connection between the first flange 31 and the second flange 32, for the first flange 31, a threaded hole 311 is provided on the first flange 31, an external threaded portion 321 is provided on the exterior of the second flange 32, and the external threaded portion 321 of the second flange 32 is in threaded connection with the threaded hole 311 of the first flange 31.

Specifically, during assembly, the external thread portion 321 of the second flange 32 is aligned with the threaded hole 311, and the external thread portion 321 is screwed into the threaded hole 311 by rotating the second flange 32, so that the two flanges are firmly and reliably fixedly connected together.

In one embodiment, in order to firmly and reliably insert the first flange 31 into the mounting opening 11 of the container body 1, one end of the first flange 31 is provided with a first flanging 312, and the first flanging 312 is positioned in the container body 1 and abuts against the inner wall of the container body 1. Specifically, in the process of processing the liner body 1, the first flange 31 is directly inserted into the mounting opening 11 of the liner body 1, the liner body 1 is blow-molded on the outside of the first flange 31, and the first outward flange 312 of the first flange 31 abuts against the inner wall of the liner body 1, so that the first flange 31 is not pulled out of the liner body 1.

In another embodiment, the other end of the first flange 31 is provided with a second flanging 313, and the second flanging 313 is embedded into the container body 1 from the inner wall of the mounting opening 11.

Specifically, in the process of processing the liner body 1, the second flanging 313 is embedded into the inner wall of the mounting opening 11, so that the first flange 31 is prevented from falling off and falling into the liner body 1 by the second flanging 313.

Meanwhile, during blow molding, the container body 1 is filled with plastic between the first flanging 312 and the second flanging 313 to improve the connection strength between the first flange 31 and the mounting opening 11.

Wherein, still be provided with a plurality of fenders 314 between first flanging 312 and the second flanging 313, fender muscle 314 is embedded into the inside of courage body 1 along the thickness of courage body 1 to can be to through fender muscle 314 first flange 31 carries out spacing fixed around its axis direction, in order to avoid when screwing up second flange 32, first flange 31 takes place to rotate.

In some embodiments, the first flange 31 is embedded in the container body 1, and the second flange 32 is connected to the first flange 31 by a threaded connection. In order to avoid the damage of the first flange 31 to the liner body 1 caused by the over-tightening of the second flange 32, a support plate 322 is further arranged on the outer periphery of the second flange 32, a plurality of limit stops 323 are arranged on the support plate 322, a positioning rib 12 is arranged on the outer side of the liner body 1 located at the mounting opening 11, and the positioning rib 12 is used for being matched with the limit stops to limit the position of the second flange 32.

Specifically, during the assembly process, the operator connects the second flange 32 to the first flange 31 by screw threads, during the process of rotating the second flange 32, the limit stop will gradually approach the positioning rib 12, and after the second flange 32 is screwed to the set number of turns, the limit stop 32 will abut against the positioning rib 12 to limit the second flange 32 to continue to rotate. Like this, mutually support through spacing stopper 323 and location muscle 12, can restrict the number of turns of second flange 32 on threaded connection to first flange 31 to satisfy under the circumstances that second flange 32 is firmly connected, reduce the axial torsion that first flange 31 bore, and then avoid receiving torsion too big because of first flange 31, and cause the connection position of first flange 31 and courage body 1 to take place to damage.

In some embodiments, in order to form the limit stop conveniently, a flange structure 324 may be provided at the outer edge of the supporting plate 322, the limit stop is provided on the flange structure 324, and the free end of the limit stop protrudes to the outside of the flange structure 324 toward the positioning rib 12. Specifically, the limit stopper is formed on the folding edge knot so that the limit stopper extends in the extending direction of the threaded portion. During assembly, the screw thread part is gradually screwed into the threaded hole 311, so that the limit stop is gradually close to the positioning rib 12 around the outer side of the mounting hole 11, and finally the limit stop abuts against the positioning rib 12, thereby completing the assembly.

In a preferred embodiment, in order to improve the sealing performance of the intermediate connector 3, it is necessary to seal the connection portion formed between the intermediate connector 3 and the container body 1, specifically: a sealing ring 33 is arranged between the second flange 32 and the liner body 1, and the sealing ring 33 surrounds the periphery of the mounting opening 11. Specifically, since the first flange 31 is directly inserted into the mounting opening 11, the first flange 31 and the container body 1 have a good sealing connection therebetween. During the process of tightening the second flange 32, the second flange 32 will gradually approach the liner body 1, and the sealing ring 33 will be squeezed between the liner body 1 and the second flange 32. Wherein, an end of the container body 1 is provided with a boss 10, a mounting port 11 is formed on the boss 10, and a sealing ring 33 is clamped between the boss 10 and the second flange 32. Specifically, the boss 10 protrudes from the end of the liner body 1, the mounting port 11 is formed on the boss 10, and after the second flange 32 is screwed, the seal ring 33 is pressed between the top surface of the boss 10 and the second flange 32, so that the sealing treatment of the connection region between the second flange 32 and the liner body 1 is performed.

In a third embodiment, as shown in fig. 11, the utility model further provides an electric water heater, which includes a housing 1000 and the liner assembly 2000, wherein the liner assembly 2000 is disposed on the housing 1000.

Specifically, the electric water heater provided by the present invention configures the inner container assembly of the second embodiment in the housing 1000, and two inner container assemblies 2000 can be configured in the housing 1000 to increase the water storage capacity according to the design requirement.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.

Claims

1. An electric heating device, comprising:

2. The electric heating device of claim 1, wherein the longitudinal section of the water return cover is an inverted U-shaped structure, a semicircular structure or an inverted V-shaped structure.

3. The electric heating apparatus according to claim 1, further comprising a stopper, wherein the water inlet pipe is sandwiched between the stopper and the water return cover.

4. The electric heating device according to claim 3, wherein a positioning groove is formed on the upper surface of the limiting block, and the water inlet pipe is clamped in the positioning groove.

5. The electric heating device of claim 3, wherein the limiting block is clamped on the water return cover.

6. An electric heating apparatus according to any one of claims 1 to 5, further comprising:

and the connecting positioning piece is connected between the electric heating pipe and the water inlet pipe and between the water outlet pipes.

7. The electric heating device according to claim 6, wherein the connecting and positioning member comprises a first connecting member and a second connecting member, the first connecting member is provided with a first clamping groove, and the second connecting member is provided with a second clamping groove and a third clamping groove;

8. The electric heating device of claim 7, wherein the electric heating device comprises a plurality of electric heating tubes, and a plurality of third locking grooves are provided on the second connecting member, and the third locking grooves are locked on the corresponding electric heating tubes.

9. The electric heating device as claimed in claim 6, wherein the water inlet end of the water inlet pipe extending to the outer surface of the flange is provided with a first connecting pipe orifice; and a second connecting pipe orifice is arranged at the water outlet end part of the water outlet pipe extending out of the outer surface of the flange plate.

10. An electric water heater comprising a housing and a liner, the liner being disposed in the housing, characterized by further comprising an electric heating device according to any one of claims 1-9, the electric heating device being disposed on the liner.