CN215571206U - Foaming water tank for electric water heater and electric water heater - Google Patents

Abstract

The utility model discloses a foaming water tank for an electric water heater and the electric water heater. Foaming water tank for electric water heater includes: the shell comprises two shells, wherein a first notch is formed in the edge of one shell; the inner container is internally provided with a water storage cavity, and a water pipe is arranged on the inner container; the edge of the shielding plate is provided with a second notch; the inner container is located between the two shells, the two shells are connected together, the shielding plate is arranged in the first notch, and a penetrating space for accommodating the water pipe to penetrate is formed between the first notch and the second notch. The overflow in the foaming process of the water tank is reduced, the foaming quality is improved, and the heat insulation performance of the water heater is improved.

Description

Foaming water tank for electric water heater and electric water heater

Technical Field

The utility model belongs to the technical field of household appliances, and particularly relates to a foaming water tank for an electric water heater and the 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, heat pump water heaters, solar water heaters and the like. Electric water heaters are widely used because of their convenient use. The electric water heater can be divided into a water storage type electric water heater and an instant heating type electric water heater according to the heating power, and the water storage type electric water heater has the characteristics of large water yield, stable water temperature and the like due to the arrangement of a water tank, and is purchased and used by more families.

For a conventional water storage type electric water heater, the conventional water storage type electric water heater generally comprises a water tank, an electric heating component and an electric control board, wherein the water tank comprises a shell and an inner container, the inner container is arranged in the shell, and an insulating layer is formed between the shell and the inner container to improve the insulating performance of the water tank. The inner container is connected with a water inlet and outlet pipe, and the water inlet and outlet pipe extends out of the water tank shell. With the design of the flat electric water heater, the shell is not a cylinder structure any more, but a front shell and a rear shell are assembled to place the liner, and meanwhile, gaps are arranged on the front shell and the rear shell to place a water inlet pipe and a water outlet pipe of the liner.

In the foaming process, the water inlet pipe and the water outlet pipe are arranged by splicing the notches on the front shell and the rear shell, so that foaming material overflow is easy to occur due to poor sealing, and the foaming quality of the product is influenced. In view of this, how to design a technology for reducing foaming flash to improve foaming quality and improve heat preservation performance of a water heater is a technical problem to be solved by the utility model.

SUMMERY OF THE UTILITY MODEL

The utility model provides a foaming water tank for an electric water heater and the electric water heater, which can reduce the occurrence of flash in the foaming process of the water tank, improve the foaming quality and improve the heat-insulating property of the water heater.

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

in one aspect, the present invention provides a foaming water tank for an electric water heater, comprising:

the shell comprises two shells, wherein a first notch is formed in the edge of one shell;

the inner container is internally provided with a water storage cavity, and a water pipe is arranged on the inner container;

the edge of the shielding plate is provided with a second notch;

the inner container is located between the two shells, the two shells are connected together, the shielding plate is arranged in the first notch, and a penetrating space for accommodating the water pipe to penetrate is formed between the first notch and the second notch.

In an embodiment of the application, the casing divide into preceding shell and backshell, be provided with on the backshell first breach, shielding plate detachable connects on the backshell.

In an embodiment of the application, the inner wall of backshell disposes joint portion, be provided with joint cooperation portion on the shielding plate, joint cooperation portion clamps on the joint portion.

In an embodiment of the application, the joint portion is including distributing the slot of first breach both sides, joint cooperation portion is including distributing the cutting of second breach both sides, be provided with first jack catch on the cutting, the cutting is inserted and is being corresponded the side in the slot, first jack catch card is in the tip of slot.

In an embodiment of the present application, a boss protruding toward the inside of the rear case is disposed on the rear case, and the first notch is formed on one side of the boss; according to the principle of the shielding plate, a bending plate is further arranged at the end part of the second notch, and the bending plate shields the side part of the first notch.

In an embodiment of the present application, the both sides of bending plate are provided with the second jack catch respectively, the second jack catch card is in the edge of first breach.

In an embodiment of the present application, a lining plate is further disposed between the front shell and the rear shell, and the front shell is disposed on the rear shell through the lining plate; the lining plate is attached to the bending plate.

In an embodiment of the present application, a cover plate is disposed on the lining plate, and the cover plate covers the outside of the shielding plate.

In an embodiment of the application, the both sides of apron still are provided with the extension board, the apron with two the extension board forms U type groove structure, the boss is located in the U type groove structure.

In an embodiment of the present application, a first arc rib is disposed at an edge of the first notch, and a second arc rib is disposed at an edge of the second notch; the first arc-shaped rib abuts against the end part of the second arc-shaped rib.

In an embodiment of the application, be provided with the connecting pipe on the inner bag, the water pipe passes the connecting pipe stretches into in the inner bag, the winding has the sealing member on the connecting pipe, the sealing member is located the connecting pipe with the edge of first breach with between the edge of second breach.

In another aspect, the utility model also provides an electric water heater, which comprises the foaming water tank for the electric water heater.

Compared with the prior art, the utility model has the advantages and positive effects that: through being provided with first breach on the casing to dispose the shielding plate simultaneously and shelter from the water pipe, the cooperation of second breach and first breach on the shielding plate can surround the periphery circle at the water pipe, the at utmost reduce around the water pipe and the gap that forms between the shell, like this, at the foaming in-process, can effectually reduce the foaming material from overflow around the water pipe, and then realize reducing the flash of appearing in the water tank foaming in-process, improve foaming quality and improve water heater thermal insulation performance.

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 water heater according to the present invention;

FIG. 2 is a cross-sectional view of an embodiment of the electric water heater of the present invention;

FIG. 3 is an enlarged view of a portion of area A of FIG. 2;

FIG. 4 is an enlarged partial view of the area B in FIG. 2;

FIG. 5 is an enlarged view of a portion of the area C of FIG. 2;

FIG. 6 is an exploded view of an embodiment of the electric water heater of the present invention;

FIG. 7 is an enlarged partial view of region D of FIG. 6;

FIG. 8 is a schematic view of a partial structure of an electric water heater according to an embodiment of the present invention;

FIG. 9 is an enlarged partial view of area E of FIG. 8;

FIG. 10 is a schematic structural view of a liner plate in an embodiment of an electric water heater according to the present invention;

FIG. 11 is a schematic structural view of a shielding plate in an embodiment of an electric water heater according to the present invention;

fig. 12 is a schematic structural diagram of a front panel in another embodiment of the electric water heater of the present invention.

FIG. 13 is a schematic view of another embodiment of a flat inner container of an electric water heater according to the present invention;

FIG. 14 is a second schematic structural view of a flat inner container in another embodiment of the electric water heater of the present invention;

FIG. 15 is a cross-sectional view taken along line M-M of FIG. 14;

FIG. 16 is an enlarged view of a portion of the area N in FIG. 15;

FIG. 17 is a schematic view of a connection pipe structure in another embodiment of an electric water heater according to the present invention.

Description of reference numerals:

a housing 1;

the rear shell 11, the first screw hole 111, the mounting table 112, the second positioning groove 113, the step surface 114, the blocking rib 115, the first notch 116, the clamping portion 117, the boss 118 and the first arc-shaped rib 1161;

the lining plate 12, a first through hole 121, a first clamping portion 122, a second screw hole 123, a first guide sliding groove 124, a second guide sliding groove 125, a positioning rib 126, an extending edge 127, a cover plate 128 and an extending plate 129;

a card slot 1221, a first positioning slot 1222;

the front shell 13, the second clamping part 130, the front panel 131, the shell 132, the second through hole 133, the groove 134, the slot 135, the second tongue 136 and the extension part 137;

a pawl 1301, a first insertion tongue 1302;

a decorative cover 14;

the shielding plate 15, the second notch 151, the clamping matching part 152, the second arc-shaped rib 1511, the bending plate 153, the first claw 1521, the second claw 1531 and the sliding groove 154;

a mounting opening 101, an annular shield 102;

an inner container 2;

a liner shell 21, a connecting pipe 22, a water inlet pipe 23 and a water outlet pipe 24;

the concave structure 211, the linear extending part 212, the end surface 221 and the inserting part 222;

a flange connecting port 201, a connecting frame 202 and a fixing hole 203;

an electric heating part 3;

a first line segment a, a second line segment b, a third line segment c and a fourth line segment d;

a hanger 100.

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 the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the utility model. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.

The electric water heater adopts electric energy as a main energy material, and high-temperature heat generated after electrification directly heats water stored in the electric water heater so as to achieve the purpose of preparing hot water.

The electric water heater generally includes a water tank, an electric heating component, an electric control board and other components, wherein a water storage cavity is formed in the water tank to store water to be heated, the electric heating component is inserted into the water storage cavity formed in the water tank, and the electric control board is used for controlling the electric heating component to be powered on and powered off to operate, so that the water in the water tank is heated to a set temperature.

For a water tank of an electric water heater, the water tank generally comprises an outer shell and an inner container, and an insulating layer is formed between the outer shell and the inner container. Wherein, the shell is generally made of plastic materials to meet the design requirements of beautiful and diversified shapes; the inner container can be a metal container body or a plastic container body according to requirements.

In addition, the heat preservation layer formed between shell and the inner bag, commonly used heat preservation material have: asbestos, sponge, foamed plastic, polyurethane foam, etc., in the conventional technology, in order to obtain a good heat preservation effect, a heat preservation layer is usually formed in a foaming manner.

Wherein, for the inner bag that adopts the metal courage body, because influenced by water quality, the inside of inner bag corrodes easily, for this reason, still dispose the magnesium stick on the water tank, the magnesium stick inserts in the inside water storage cavity of water tank.

Magnesium is the lowest potential metal in the electrochemical series and is physiologically nontoxic. Therefore, the magnesium rod protective liner is very ideal. The size of the magnesium rod is directly related to the length of the time for protecting the inner container and the size of the protection effect, and the larger the magnesium rod is, the better the protection effect is and the longer the protection time is.

The water tank is also provided with a water inlet pipe and a water outlet pipe, the water inlet pipe is used for conveying cold water to a water storage cavity formed in the water tank, and hot water in the water storage cavity is output from the water outlet pipe.

For the electric heating part, an electric heating mode such as an electric heating wire, magnetic energy or silicon tube heating can be adopted to heat the water stored in the water storage cavity.

The electric control board is used for receiving detection signals sent by related sensors (such as a water temperature sensor and a flow sensor) and controlling the electric heating component to be powered on and powered off.

When the electric water heater works, the electric control board controls the electric heating part to be electrified and heated, and when the water temperature of water in the water tank reaches a set value, the electric control board controls the electric heating part to be powered off.

The water tank for the electric water heater according to the embodiment of the utility model. It should be noted that the water tank according to the embodiment of the present invention may be installed on a wall extending in a vertical direction, or may be installed on a wall extending in a horizontal direction.

For convenience of description, the structure of the water tank will be described below by taking the case where the water tank is mounted on a vertical wall as an example.

In the first embodiment, as shown in fig. 1 to 10, the present invention further provides an electric water heater, wherein a heat preservation water tank is used, a flat design is adopted to reduce an effective indoor space occupied by the electric water heater, and the heat preservation water tank comprises a housing 1, an inner container 2 and an electric heating part 3 which are assembled together. The outer shell 1 and the inner container 2 are both of flat structures, and the outer shell 1, the inner container 2 and the electric heating part 3 are correspondingly improved in structure as follows.

In order to meet the requirement of water inlet and outlet for the inner container 2, a water inlet pipe 23 and a water outlet pipe 24 are connected to the inner container 2. For the housing, it comprises two shells, wherein the edge of one of the shells is provided with a first notch 116.

In order to reduce the phenomenon that the foaming material overflows to the outside of the shell through the water inlet pipe 23 or the water outlet pipe 24 in the foaming process, the foaming device also comprises a shielding plate 15, and a second notch 151 is arranged on the edge of the shielding plate 15; the inner container is located between the two shells, the two shells are connected together, the shielding plate 15 is arranged in the first notch 116, and a penetrating space for accommodating the water pipe to penetrate is formed between the first notch 116 and the second notch 151.

In the actual assembling process, the inner container is arranged between the two shells, the water inlet pipe 23 and the water outlet pipe 24 on the inner container are respectively inserted into the corresponding first notches 116, and each first notch 116 is provided with the shielding plate 15 for shielding protection, so that the matching gap between the water pipe and the shell is reduced, and the occurrence of foaming material overflow is reduced.

Taking the water inlet pipe 23 as an example, after the inner container is placed in the casing with the first notch 116, the water inlet pipe 23 is placed in the first notch 116; then, the shielding plate 15 is installed in the first notch 116, and the first notch 116 and the second notch 151 are matched with each other, so that a connection gap formed between the water inlet pipe 23 and the housing is smaller, leakage of the foaming material is reduced more effectively, and foaming quality is improved.

The housing is divided into a front shell 13 and a rear shell 11 which are spliced together, a first notch 116 is arranged on the rear shell 11, and the shielding plate 15 is detachably connected to the rear shell 11.

In order to facilitate the fixing of the shielding plate 15 on the rear housing 11, the inner wall of the rear housing 11 is provided with a clamping portion 117, the shielding plate 15 is provided with a clamping matching portion 152, and the clamping matching portion 152 is clamped on the clamping portion 117.

Specifically, in the actual assembly process, after the inner container is mounted on the rear shell 11, the shielding plate 15 is mutually matched with the clamping portion 117 through the clamping matching portion 152, so that the shielding plate 15 can be conveniently clamped on the rear shell 11 without being additionally assembled by means of other tools.

There are many ways to embody the entities of the snap-fit portion 152 and the snap portion 117.

For example: joint portion 117 is including the slot that distributes in first breach 116 both sides, and joint cooperation portion 152 is including the cutting that distributes in second breach 151 both sides, be provided with first jack catch 1521 on the cutting, the cutting is inserted and is corresponded the side in the slot, first jack catch 1521 card is in the tip of slot.

Specifically, during the assembly process, the shielding plate 15 is inserted into the slots on both sides of the first notch 116 through the insertion strips on both sides, and after the shielding plate 15 is assembled in place, the first clamping jaw 1521 is clamped at the end of the slot to achieve positioning.

In order to improve the installation smoothness and stability, the two sides of the shielding plate 15 are respectively provided with a sliding groove 154, and the edge of the first notch 116 can be inserted into the sliding groove 154 to realize the sliding insertion.

In some embodiments, in order to improve the strength of the mounting structure, the rear case 11 is provided with a boss 118 protruding toward the inside of the rear case 11, and a first notch 116 is formed at one side of the boss 118; the shielding plate 15 is further provided with a bending plate 153 at an end of the second notch 151, and the bending plate 153 shields a side portion of the first notch 116.

Specifically, the boss 118 protrudes towards the inside of the rear shell 11, and a first notch 116 is formed on one side of the boss 118, so that the overall structure of the boss 118 is strong, and the water pipe can be effectively positioned and supported by the boss 118 in the foaming process. Meanwhile, the water pipe is placed in the notch formed in the end face of the boss 118 by the first notch 116, and the requirement for firm installation of the shielding plate 15 can be better met by the boss 118. The notch formed in the first notch 116 at the side of the boss 118 is blocked by the bent plate 153, and the connection strength between the blocking plate 15 and the rear case 11 is enhanced.

In another embodiment, two sides of bending plate 153 are respectively provided with a second jaw 1531, and second jaw 1531 is clamped at the edge of first notch 116.

Specifically, after the shielding plate 15 is mounted in place, the second claw 1531 is clamped at the edge of the notch at the side of the boss 118, so that the bending plate 153 is also firmly fixed on the boss 118.

In some embodiments, a liner plate 12 is further disposed between the front shell 13 and the rear shell 11, and the front shell 13 is disposed on the rear shell 11 through the liner plate 12; the backing plate 12 rests against the bending plate 153.

Specifically, the backing plate 12 is fixed to the rear case 11 by screws, and the front case 13 can be clamped on the backing plate 12 to cover the screws on the backing plate 12 by the front case 13. The backing plate 12 can also rest against the bent plate 153, and the surface of the bent plate 153 is flush with the side surface of the boss 118, so as to better improve the tightness of the connection between the rear housing 11 and the backing plate 12.

In one embodiment, a cover plate 128 is provided on the backing plate 12, and the cover plate 128 covers the exterior of the shutter 15.

Specifically, the cover plate 128 covers the outer sides of the boss 118 and the shielding plate 15, so that the foaming material is further shielded by the cover plate 128 in the foaming process, and leakage of the foaming material is further prevented. Preferably, the cover plate 128 is further provided with extension plates 129 at both sides, the cover plate 128 and the two extension plates 129 form a U-shaped groove structure, and the boss 118 is located in the U-shaped groove structure. After the backing plate 12 is assembled on the rear shell 11, the cover plate 128 and the extension plates 129 on both sides can partially wrap the shielding plate 15 and the boss 118, so that on one hand, the connection reliability between the components is improved, and on the other hand, the foaming material is more favorably prevented from overflowing from the connection gap.

In some embodiments, a first arc rib 1161 is disposed at an edge of the first notch 116, and a second arc rib 1511 is disposed at an edge of the second notch 151; the ends of the first arc-shaped rib 1161 and the second arc-shaped rib 1511 abut against each other.

Specifically, the first arc-shaped rib 1161 and the second arc-shaped rib 1511 are matched with each other to wrap the outside of the water pipe of the inner container, and a wider contact area is formed between the first arc-shaped rib 1161 and the water pipe and between the second arc-shaped rib 1511 and the water pipe, so that the overflow path of the foaming material is prolonged, and further the overflow of the foaming material is prevented.

Preferably, a connecting pipe 22 is arranged on the inner container, the water pipe passes through the connecting pipe 22 and extends into the inner container, and a sealing member (not marked) is wound on the connecting pipe 22 and is positioned between the connecting pipe 22 and the edge of the first notch 116 and the edge of the second notch 151.

Specifically, the inner container is added with the connecting pipe 22 with a larger outer diameter for installing the water inlet pipe 23 and the water outlet pipe 24, and the connecting pipe 22 can be matched with the first notch 116 and the second notch 151 more closely. In the foaming process, the sealing member (such as foam or double-sided adhesive tape) wound on the connecting tube 22 is used to seal the connecting gap between the connecting tube 22 and the gap, so as to effectively prevent the foaming material from overflowing.

And for the outside of the rear shell 11, a decoration cover 14 can be configured, the decoration cover 14 can shield the groove structure formed by the boss and the outer wall of the rear shell 11, and a hole is configured on the decoration cover 14 for inserting the water inlet pipe 23 and the water outlet pipe 24.

Second embodiment, as shown in fig. 1 to 11, based on the first embodiment, in order to meet the requirement of foaming and flash prevention and simultaneously meet the requirement of later maintenance and replacement of the electric heating component, the front part of the housing 1 is provided with a mounting opening 101, the inner wall of the housing 1 is further provided with an annular shielding part 102, and the annular shielding part 102 is arranged around the mounting opening 101.

The front part of the inner container 2 is provided with a flange connecting port 201.

The inner container 2 is located in the housing 1, the annular shielding portion 102 surrounds the outer side of the flange connection port 201, an insulating layer (not shown) is arranged between the housing 1 and the inner container 2, and the electric heating element 3 is arranged on the flange connection port 201 and extends into the inner container 2.

Specifically, the whole water tank adopts the flattening design, and its thickness dimension is less than height and length dimension, in order to satisfy the installation requirement of electric heating element 3, simultaneously, also to satisfy later stage electric heating element 3 maintenance requirement, then dispose installing port 101 in the front portion of shell 1, corresponding, the front portion of inner bag 2 disposes flange connection mouth 201.

When the electric heating part 3 needs to be assembled, the electric heating part 3 can be inserted from the mounting opening 101 and extend into the inner container 2 through the flange connecting opening 201 to complete the assembly. Similarly, when the electric heating element 3 is replaced in later maintenance, the electric heating element 3 can be detached from the inner container 2 through the attachment opening 101 and can be easily taken out.

Meanwhile, for the water tank of a flat structure, the electric heating part 3 is installed at the front of the inner container 2 to firmly and reliably install the electric heating part 3 by sufficiently using the area of the front surface of the inner container 2.

More importantly, in order to reduce or avoid the foaming material from overflowing around the flange connecting port 201 of the inner container 2 during foaming, an annular shielding part 102 extending towards the flange connecting port 201 is formed on the inner wall of the housing 1, and the annular shielding part 102 is of a cylindrical structure and surrounds the periphery of the mounting port 101. When the inner container 2 is installed in the housing 1, the annular shielding portion 102 surrounds the flange connection port 201, and an area for blocking the leakage of the foaming material is formed between the annular shielding portion 102 and the flange connection port 201.

A foaming cavity is formed between the outer shell 1 and the inner container 2, after foaming materials are injected into the foaming cavity, when the foaming materials flow to the flange connecting port 201, the foaming materials can be blocked by the annular blocking portion 102, and then leakage of the foaming materials from the flange connecting port 201 is reduced.

In some embodiments, to improve the anti-flash effect, the edge of the annular shield 102 rests against the outer wall of the liner 2.

Specifically, after the inner container 2 is installed in the housing 1, the edge of the annular shielding portion 102 will be attached to the outer wall of the inner container 2, so that the annular shielding portion 102 can better prevent the foaming material from leaking from the flange connection port 201 during the foaming process.

In the preferred embodiment, for ease of assembly, a gap is formed between the edge of the annular curtain portion 102 and the outer wall of the inner container 2. Further, in order to reduce leakage of the foaming material from the gap, a first flexible sealing portion (not shown) may be provided outside the annular shielding portion 102, and the first flexible sealing portion may shield the gap.

Specifically, during the assembly process, the first flexible sealing portion is wound around the exterior of the annular shielding portion 102 and extends out to the edge of the annular shielding portion 102. After the inner container 2 is installed in the housing 1, since the first flexible sealing portion is elastically deformable, the first flexible sealing portion will tightly abut against the outer wall of the inner container 2, so as to effectively seal the gap formed between the annular shielding portion 102 and the inner container 2 by the first flexible sealing portion.

Similarly, a second flexible sealing portion that covers the gap may be provided outside the flange connection port 201.

Specifically, in the assembling process, a second flexible sealing portion is firstly wound around the flange connection port 201 on the liner 2. After the inner container 2 is installed in the housing 1, since the second flexible sealing portion is elastically deformable, the annular shielding portion 102 presses on the second flexible sealing portion to effectively seal the gap formed between the annular shielding portion 102 and the inner container 2 by the second flexible sealing portion.

In the actual use process, for the concrete representation entity of the flexible sealing portion, collodion or a sealing gasket and other components can be adopted, which are not limited and described herein.

In another embodiment, in order to better block the foaming material flowing to the flange connection port 201 through the annular shielding portion 102, the outer diameter of the annular shielding portion 102 is gradually reduced along the direction from the mounting port 101 to the flange connection port 201.

Specifically, the cross section of the annular shielding portion 102 is of a bell mouth structure, the size of a port of the annular shielding portion 102 opposite to the liner 2 is small, and the outer wall of the annular shielding portion 102 forms an inclined surface, so that on one hand, the small port is used for preventing the foaming material from overflowing, and on the other hand, the inclined outer wall is used for ensuring that the foaming material can flow along the inclined port so as to be uniformly distributed outside the liner 2.

In some embodiments, the position of the inner container 2 in the outer casing 1 is effectively positioned before foaming, so as to avoid the inner container 2 from shifting in the outer casing 1 during foaming. A connection bracket 202 is provided at the back of the inner container 2, and a screw hole (not labeled) is provided at the connection bracket 202. Correspondingly, the back of the shell 1 is provided with a hanging rack 100, and the hanging rack 100 is provided with a mounting hole (not marked); the bolts pass through the mounting holes and extend into the housing 1 to be screwed therein, and the connecting frame 202 abuts against the inner wall of the housing 1.

Specifically, after the inner container 2 is installed in the housing 1, the inner container 2 is fixed to the housing 1 by the connecting frame 202, and at the same time, the connecting frame 202 is connected to the hanger 100 by bolts, and plays a role of installing the hanger 100.

In another embodiment, the mounting opening 101 is formed in the front of the housing 1, and may be shielded by a front panel 131 disposed in the front of the housing 1 for the purpose of optimizing the appearance. The front panel 131 is fixed to the front of the housing 1 to shield the mounting opening 101 during normal use, and the front panel 131 is removed when the electric heating part 3 needs to be repaired.

Through the anterior configuration installing port at the shell in order to satisfy the installation of electrical heating part and the requirement of later stage maintenance, simultaneously, the inside of shell still is formed with the annular shielding part that extends towards the inboard around the installing port, annular shielding part surrounds the flange connection mouth periphery at the inner bag, because the front surface of annular shielding part and inner bag is mutually supported, can play better anti-overflow material to the periphery of flange connection mouth and handle, thus, in the foaming process, the foaming material flows into between shell and the inner bag after, the foaming material flows the flange connection mouth department of inner bag and can be blockked by annular shielding part, with reduce the foaming material excessive, and then improve the foaming quality, with improvement product quality.

In the third embodiment, as shown in fig. 13-17, the utility model further provides an inner container 2 with a flat structure for an electric water heater, wherein the inner container 2 is integrally of a flat structure; the liner 2 comprises two liner shells 21 and a plurality of connecting pipes 22, the liner shells 21 are integrally of an arc-shaped structure, at least one liner shell 21 is provided with a fixing hole 203 penetrating through the arc-shaped structure, the edges of the two liner shells 21 are mutually welded together, and a water storage cavity is formed between the two liner shells 21; the connecting pipe 22 is arranged on the fixing hole 203 and communicated with the water storage cavity.

Specifically, for the inner container, the whole inner container is of a flat structure, namely, the thickness dimension is smaller than the length dimension and the height dimension of the inner container. In order to meet the design requirement of the pressure container, the liner shell 21 is integrally of an arc-shaped structure, so that the liner has high pressure resistance.

And for the connecting pipe 22, the function is used for connecting the water inlet pipe or the water outlet pipe of the electric water heater, the connecting pipe 22 is directly welded and installed in the external cambered surface area of the liner shell 21, and further is far away from the welding seam formed at the edge of the liner shell 21, so that a straight line section does not need to be formed at the edge of the liner shell 21 or the length of the straight line section at the edge of the liner shell 21 is reduced, and the integral thickness of the liner is effectively reduced.

In the actual use process, the overall appearance of the inner container 2 is designed according to the needs, for example: the inner container 2 may be circular, oval, etc., without limitation. In some embodiments, one end surface 221 of the connection pipe 22 is provided with a protruding insertion part 222 arranged around the nozzle of the connection pipe 22, the insertion part being inserted into the fixing hole 203, the connection pipe 22 being welded on the fixing hole 203.

Specifically, in order to improve the installation reliability of the connection pipe 22, so that the connection pipe 22 can be quickly and accurately installed and fixed on the arc surface, during actual assembly, the connection pipe 22 can be inserted into the corresponding fixing hole 203 through the insertion portion. After the insertion part is inserted into the fixing hole 203, the connecting pipe 22 is preassembled in the fixing hole 203, and the positional relationship between the connecting pipe 22 and the bladder shell 21 is accurately positioned.

In preassembling the connecting tube 22 into the fixing hole 203, the connecting tube 22 can be welded to the bladder shell 21, and in the welding process, a weld is formed on the outer circumference of the connecting tube 22, and the specific welding mode can adopt a conventional welding mode, which is not limited or described herein.

Preferably, the end surface 221 of the connection pipe 22 having the insertion part has a shape matching the outer peripheral shape of the fixing hole 203.

Specifically, since the connection tube 22 needs to be welded to the arc structure of the bladder 21, the accuracy of the welding position of the connection tube 22 determines the yield of the product. And through designing the shape of the end surface 221 into a shape form matched with the shape of the outer peripheral surface of the fixing hole 203, when the connecting pipe 22 is preassembled through the inserting part, the connecting pipe 22 can be accurately installed in a preset position by means of the matching of the end surface 221 and the cambered surface of the liner shell 21.

Meanwhile, in the welding process, the end surface 221 is matched with the cambered surface of the container shell 21, so that the position of the connecting pipe 22 is not easy to rotate or skew, the welding quality is improved, the requirement of welding the connecting pipe 22 on the cambered surface of the container shell 21 is met,

in other embodiments, the fixing holes 203 are punched on the container shell 21, and the concave structures 211 are formed on the container shell 21 around the fixing holes 203.

Specifically, in the punching process, the fixing hole 203 is formed on the bladder shell 21, and at the same time, the concave structure 211 is formed on the outer circumference of the fixing hole 203. And in the process of assembling the connecting pipe 22, the end surface 221 is pre-positioned on the surface of the concave structure 211, and in the welding process, the solder fills the area of the concave structure 211, so that the welding seam is more uniform, the welding reliability and the sealing performance between the connecting pipe 22 and the container shell 21 are improved, and water leakage is reduced or avoided.

In other embodiments, for the bladder shell 21, the edge of the arc structure formed by the bladder shell is provided with linear extensions 212, and the two linear extensions are welded to each other.

Specifically, the purpose of further forming the linear extension 212 on the edge of the container shell 21 is to more easily and reliably weld the two container shells 21 together. Therefore, in the actual product design process, the width of the linear extension 212 only needs to meet the requirement of welding, so that the width of the linear extension 212 is narrow, and the width of the linear extension 212 can be designed to be less than 10 mm.

In other embodiments, in order to avoid welding stress deformation of the shape of the fixing hole 203 due to heat generated by welding during welding of the container shell 21, the closest distance L of the fixing hole 203 from the edge of the linear extension is not less than 7 mm.

In one embodiment, in order to meet the installation requirement of the electric heating component, a flange connection port 201 is provided on one of the container shells 21. The electric heating component can extend into the water storage cavity through the flange connection port 201 and is connected and fixed to the flange connection port 201.

In some embodiments, in order to meet the requirement of hanging and installing the water tank, a connection frame 202 may be further disposed on the other container shell 21, and the connection frame 202 may be fixedly installed on the container shell 21 by welding, and when in use, the inner container 2 is fixedly hung and installed on the wall through the connection frame 202.

In order to effectively improve the space utilization, the connecting frame 202 is disposed at the middle upper portion of the bladder shell 21, where the thickness of the middle portion of the bladder 2 is the largest. Specifically, after the liner 2 is vertically installed on the wall, the distance between the middle of the liner 2 and the wall is the smallest, and along the arc surface of the liner shell 21, the distance between the liner 2 and the wall is gradually increased in the direction toward the edge of the liner 2. The connection frame 202 is connected to the middle upper portion of the tank case 21, so that the space between the upper portion of the tank 2 and the wall can be sufficiently utilized to achieve suspension installation.

The embodiment of the utility model is directed to a flat inner container 2, and a flat shell 1 is specially designed and also has the following structural design.

Based on the above first, second and third embodiments, the embodiment of the present invention also has the following structural design with respect to the housing 1.

In the fourth embodiment, as shown in fig. 1 to fig. 11, for the second and third embodiments of the outer shell 1, a flat design is adopted, and an arc-shaped design is adopted as a whole to achieve a good appearance design effect.

In order to achieve a front-view screwless design, the following design is used for the housing 1.

The housing 1 includes:

the rear shell 11, the edge of the rear shell 11 is provided with a first screw hole 111, and the back of the rear shell 11 forms a mounting surface;

the edge of the lining plate 12 is provided with a first through hole 121, the outer surface of the lining plate 12 is also provided with a first clamping part 122, the lining plate 12 is provided with a mounting hole 101, and the inner wall of the lining plate 12 is provided with an annular shielding part 102;

a second clamping part 130 is arranged on the inner surface of the front shell 13;

wherein, the lining plate 12 is connected with the rear shell 11, the screw passes through the first through hole 121 and is screwed in the corresponding first screw hole 111, the lining plate 12 is covered by the front shell 13, and the first clamping portion 122 is connected with the corresponding second clamping portion 130.

The rear shell 11 and the lining plate 12 in the shell 1 are connected through screws, and a mounting cavity is formed between the rear shell 11 and the lining plate 12 so as to mount the liner through the mounting cavity. Connect fixedly through the screw between backshell 11 and the welt 12 for both directly have sufficient structural connection intensity, form the requirement of heat preservation to structural strength with the foaming between satisfying the later stage shell 1 and the inner bag.

For the connection process between the rear shell 11 and the liner plate 12, specifically: after the rear case 11 and the liner plate 12 are butted together such that the first through holes 121 are aligned with the corresponding first screw holes 111, screws are then inserted through the first through holes 121 and screwed into the first screw holes 111. Thus, the rear shell 11 and the lining plate 12 are firmly and reliably fastened and connected together through the screws.

In order to achieve the appearance effect without exposed screws, the front shell 13 is mounted on the liner 12 in a clamping manner. Specifically, after the rear case 11 and the lining plate 12 are fixedly connected together, since the first through hole 121 on the lining plate 12 can be seen from the front surface of the housing 1, in order to prevent the first through hole 121 and the screw from being exposed to the whole appearance, the first through hole 121 is shielded by the front case 13.

For the connection process between the front shell 13 and the liner plate 12, specifically: the second clamping portion 130 on the front shell 13 is clamped with the first clamping portion 122 at the corresponding position on the lining plate 12, so as to clamp the front shell 13 on the lining plate 12. Meanwhile, the first through hole 121 is shielded and processed through the front shell 13, so that the first through hole 121 cannot be seen outside the shell assembly, and the overall appearance effect that no screw is exposed is achieved. Moreover, due to the adoption of the clamping mode, the clamping connection part is shielded by the front shell 13, so that the appearance effect is optimized.

In some embodiments, the concrete entities for the first card portion 122 and the second card portion 130 may take various structural forms, which are illustrated below.

The second catching portion 130 includes a claw 1301, the first catching portion 122 includes a catching groove 1221, and the claw 1301 is caught in the catching groove 1221.

Specifically, when the front shell 13 is connected with the lining plate 12 in a clamping manner, the clamping claws 1301 are clamped into the clamping grooves 1221, and the clamping claws 1301 are matched with the clamping grooves 1221, so that the front shell 13 is connected with the lining plate 12.

In order to improve the connection strength, the second clamping portion 130 further includes a first insertion tongue 1302, the first clamping portion 122 further includes a first positioning groove 1222, and the first insertion tongue 1302 is inserted into the first positioning groove 1222.

Specifically, when assembling, the first tongue 1302 is inserted into the first positioning groove 1222 to pre-position the front shell 13 and the lining plate 12, and then the claw 1301 is clamped in the clamping groove 1221 to complete the assembly between the front shell 13 and the lining plate 12.

The opening directions of the first positioning groove 1222 and the card slot 1221 are arranged back to back. In this way, the connection portion formed by the latch and the latch slot 1221 and the connection portion formed by the first insertion tongue 1302 and the first positioning slot 1222 are matched with each other, so that the front shell 13 can be more firmly and reliably fixed on the outer wall of the lining board 12.

In another embodiment, since the pawl 1301 and the first insertion tongue 1302 are both located on the inner wall of the front shell 13, when assembled, the inner wall of the front shell 13 and the outer wall of the lining plate 12 are matched with each other, so that it is difficult for an operator to accurately insert the first insertion tongue 1302 into the positioning groove.

For this, a first guide sliding groove 124 and a second guide sliding groove 125 may be provided on an outer surface of the liner 12, the first guide sliding groove 124 extending to the catching groove 1221, and the second guide sliding groove 125 extending to the catching groove.

Specifically, during assembly, the operator may first place the pawl 1301 in the first guide chute 124, and simultaneously place the first insertion tongue 1302 in the second guide chute 125.

Then, the operator slides the front housing 13 along the first and second guide sliding grooves 124 and 125 to accurately insert the first insertion tongue 1302 into the first positioning groove 1222 and finally to clamp the pawl 1301 in the clamping groove 1221.

Under the guiding action of the first guide sliding groove 124 and the second guide sliding groove 125, the guide sliding grooves can cooperate with the first insertion tongue 1302 and the claw 1301 to guide the front shell 13 to slide.

Furthermore, at the initial stage of installation, the distance between the front shell 13 and the lining plate 12 can be relatively long, so that an operator can conveniently observe the positions of the claw 1301 and the first insertion tongue 1302, and further the claw 1301 and the first insertion tongue 1302 are accurately placed in the corresponding guide sliding grooves.

Then, during the sliding process along the guiding sliding groove, the distance between the front shell 13 and the lining plate 12 gradually decreases, and the operator relies on the guiding function of the guiding sliding groove to ensure that the first inserting tongue 1302 is inserted into the first positioning groove 1222 first.

Finally, the claws 1301 are caught in the catching grooves 1221 to firmly couple the front case 13 and the liner 12 together.

In other embodiments, in order to further improve the connection strength between the front shell 13 and the liner plate 12, the following structural improvement is made for the front shell 13.

The front case 13 includes:

a front panel 131;

a housing 132, wherein the housing 132 is provided with a second clamping portion 130, and the housing 132 is further provided with a second through hole 133;

the lining plate 12 is further provided with second screw holes 123, screws pass through the second through holes 133 and are screwed into the corresponding second screw holes 123, and the front panel 131 covers the second through holes 133 and is arranged on the front panel 131.

Specifically, for the front shell 13, which adopts a split design, the shell 132 is installed on the lining plate 12 as a main body through the second clamping portion 130 and the first clamping portion 122 in a matching manner. At the same time, the housing 132 and the backing plate 12 are further firmly connected together by screws. For the screws connecting the shell 132 and the lining plate 12, the front panel 131 shields the screws to meet the design requirement of the front surface of the shell 1 without the exposed screws.

In one embodiment, the housing 132 is provided with a groove 134, the second through hole 133 is located in the groove 134, and the front panel 131 is disposed in the groove 134.

Specifically, by providing the groove 134 on the front surface of the housing 132, the front panel 131 is placed by the groove 134, so that the front surface of the housing 1 is more flat. Meanwhile, as for the second through hole 133, the second through hole 133 is located in the groove 134, so that the second through hole 133 can be shielded by the front panel 131 after the front panel 131 is fitted into the groove 134.

In another embodiment, in order to achieve convenient and secure mounting of the front panel 131 on the housing 132, a slot 135 is further provided in the groove 134, and a second insertion tongue 136 is provided on the front panel 131, and is disposed in the corresponding slot 135.

Specifically, after the housing 132 is mounted on the liner 12, the front panel 131 is inserted into the corresponding slot 135 through the tongue configured thereon to complete the mounting. The tongue and the slot 135 are mutually matched, so that the front surface of the shell 1 realizes the appearance effect without exposed screws.

In order to further improve the connection reliability of the front panel 131, an extension portion 137 extending toward the liner 12 is provided on the front panel 131, a third screw hole (not shown) is provided on the extension portion 137, and a counter bore (not shown) is provided on the housing 132, through which a screw is screwed.

Specifically, in order to meet the requirement of the design, the extension 137 may be disposed at an upper or lower portion of the front panel 131 depending on the installation position of the housing 1. So as to form an extension 137 at the bottom of the front panel 131, correspondingly, a counter bore is provided at the bottom of the housing 132, and after the front panel 131 is matched with the slot 135 through the tongue to complete the clamping connection, the front panel is further connected and fixed from the bottom through a screw.

Preferably, a detachable plug (not shown) may be further disposed on the counter bore, and after the front panel 131 is fixed to the casing 132 by screws, the screw located in the counter bore is covered by the plug, so as to further satisfy the design that no screw is exposed from the front surface of the housing 1.

In some embodiments, in order to facilitate the operator to assemble the lining plate 12 and the rear shell 11 quickly on site, the inner wall of the rear shell 11 is provided with a mounting table 112, and the mounting table 112 is provided with the first threaded hole.

Specifically, during the assembly process, the mounting table 112 can support and position the lining plate 12, so as to facilitate the operator to quickly connect and assemble the lining plate 12 with the rear shell 11.

In another embodiment, in order to facilitate positioning of the assembled rear case 11 and the liner plate 12, a second positioning groove 113 may be provided on the mounting table 112, and an edge of the liner plate 12 is caught in the second positioning groove 113.

Specifically, during the process of assembling the rear shell 11 and the liner plate 12, the rear shell 11 and the liner plate 12 may be pre-assembled by inserting the edge of the liner plate 12 into the second positioning groove 113.

Then, the relative position between the rear case 11 and the liner plate 12 is adjusted so that the first through holes 121 are aligned with the first screw holes 111.

Finally, a screw is passed through the first through hole 121 and screwed into the first screw hole 111, so that the rear case 11 and the backing plate 12 are securely and reliably assembled together.

In order to accurately position the positional relationship between the rear case 11 and the liner 12, the assembly accuracy is improved. A step surface 114 may be provided on the inner wall of the rear case 11, and a positioning rib 126 may be provided on the outer wall of the liner 12, the positioning rib 126 abutting against the step surface 114.

Specifically, in the process of assembling the rear shell 11 and the liner plate 12, reference is made to the above-mentioned process of performing pre-positioning through the positioning groove, so that the rear shell 11 and the liner plate 12 are pre-assembled together. Meanwhile, after the edge of the lining plate 12 is inserted into the positioning groove, the positioning rib 126 on the lining plate 12 abuts against the step surface 114, so that the rear shell 11 and the lining plate 12 are accurately positioned, and the overall assembly quality of the shell assembly is improved.

In one embodiment, the edge of the rear shell 11 is further provided with a rib 115, the rib 115 is located outside the step surface 114, and the edge of the front shell 13 is provided with an extending edge 127, and the extending edge 127 surrounds the rib 115.

Specifically, the front shell 13 can cover the whole outer surface of the lining plate 12, and the front shell 13 can cover the whole lining plate 12 outside the lining plate 12, so that the visual effect of the appearance is optimized. Meanwhile, for the blocking rib 115 formed on the edge of the rear shell 11, on one hand, when the rear shell is assembled, the blocking rib 115 can be matched with the extension edge 127 for pre-positioning, so that the assembling efficiency and the assembling accuracy are improved; on the other hand, the rib 115 is shielded by the extending edge 127 formed on the edge of the front shell 13, which is more beneficial to improving the overall appearance effect.

In a preferred embodiment, for the butt-joint region between the front shell 13 and the rear shell 11, the edge of the front shell 13 is designed to be aligned with the edge of the rear shell 11, so as to reduce the size of the joint gap generated between the front shell 13 and the rear shell 11 at the butt-joint region.

In addition, the number of the connecting portions between the rear case 11 and the backing plate 12 and the number of the connecting portions between the front case 13 and the backing plate 12 are designed to correspond to the overall size of the housing assembly.

For example: a plurality of mounting platforms 112 may be provided at the edge of the rear case 11, and the plurality of mounting platforms 112 are distributed along the edge of the rear case 11.

Correspondingly, the backing plate 12 is provided with a number of first through holes 121 corresponding to the number of the mounting bases 112, so that the rear case 11 and the backing plate 12 are fixedly connected by a plurality of screws.

Similarly, the number of the clamping connection between the front shell 13 and the lining plate 12 is also plural, and is not limited herein.

Through adopting the welt with will preceding shell and backshell indirect linking together, through the inseparable linking together of screw between welt and the backshell to satisfy the overall structure intensity requirement of shell, and preceding shell passes through the mode and the welt of joint and is connected, preceding shell will cover the welt and then shelter from the screw, makes the whole effect of shell realize no exposed outward appearance of screw, has optimized the whole outward appearance of shell, in order to improve user experience nature.

In the description of the present specification, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

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 (12)

1. A foaming water tank for an electric water heater is characterized by comprising:

the shell comprises two shells, wherein a first notch is formed in the edge of one shell;

the inner container is internally provided with a water storage cavity, and a water pipe is arranged on the inner container;

the edge of the shielding plate is provided with a second notch;

the inner container is located between the two shells, the two shells are connected together, the shielding plate is arranged in the first notch, and a penetrating space for accommodating the water pipe to penetrate is formed between the first notch and the second notch.

2. The foam water tank for the electric water heater according to claim 1, wherein the housing is divided into a front housing and a rear housing, the rear housing is provided with the first notch, and the shielding plate is detachably connected to the rear housing.

3. The foam water tank for the electric water heater according to claim 2, wherein a clamping portion is disposed on an inner wall of the rear case, and a clamping engagement portion is disposed on the shielding plate and clamped on the clamping portion.

4. The foam water tank for the electric water heater according to claim 3, wherein the clamping portion comprises slots distributed on both sides of the first notch, the clamping engagement portion comprises a slip distributed on both sides of the second notch, the slip is provided with a first claw, the slip is inserted into the slot on the corresponding side, and the first claw is clamped at the end of the slot.

5. The foam water tank for the electric water heater according to claim 2, wherein the rear case is provided with a boss protruding toward the inside of the rear case, and one side of the boss forms the first notch; according to the principle of the shielding plate, a bending plate is further arranged at the end part of the second notch, and the bending plate shields the side part of the first notch.

6. The foam water tank for the electric water heater according to claim 5, wherein the two sides of the bent plate are respectively provided with a second jaw, and the second jaws are clamped on the edge of the first notch.

7. The foam water tank for the electric water heater according to claim 5, wherein a lining plate is further disposed between the front shell and the rear shell, and the front shell is disposed on the rear shell through the lining plate; the lining plate is attached to the bending plate.

8. The foam water tank for the electric water heater according to claim 7, wherein a cover plate is disposed on the lining plate, and the cover plate covers the outside of the shielding plate.

9. The foam water tank for the electric water heater according to claim 8, wherein the cover plate is further provided with extension plates at both sides thereof, the cover plate and the two extension plates form a U-shaped groove structure, and the boss is located in the U-shaped groove structure.

10. The foam water tank for the electric water heater according to claim 1, wherein the edge of the first notch is provided with a first arc-shaped rib, and the edge of the second notch is provided with a second arc-shaped rib; the first arc-shaped rib abuts against the end part of the second arc-shaped rib.

11. The foam water tank for the electric water heater according to any one of claims 1-10, wherein a connecting pipe is arranged on the inner container, the water pipe extends into the inner container through the connecting pipe, and a sealing member is wound on the connecting pipe and positioned between the connecting pipe and the edge of the first notch and the edge of the second notch.

12. An electric water heater comprising the foam tank for an electric water heater according to any one of claims 1 to 11.

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