Water heater and inner container thereof

Abstract

The utility model discloses a water heater applying an enamel spraying process and an inner container of the water heater, the inner container comprises a cylinder body, a first end cover and a second end cover, the first end cover and the second end cover are arranged at the two ends of the cylinder body, the first end cover and the second end cover are respectively connected with the cylinder body, and the first end cover and the second end cover protrude towards the direction far away from the cylinder body; the first end cover is provided with at least one mounting hole for assembling a functional part; an open hole is formed in the second end cover, and the open hole is used for allowing enamel spraying equipment to stretch into the inner container in the inner container manufacturing process so as to conduct enamel spraying treatment on the inner surface of the inner container; a plugging piece fixedly connected with the open hole is arranged at the open hole; the inner surface of the inner container is provided with an enamel coating, and the enamel coating is formed through enamel spraying treatment. The material utilization rate of the inner container can be effectively increased, the cost is reduced, and for the inner container with the preset length and section size, the volume of the inner container can be increased; or for the inner container with the preset volume and section size, the length of the inner container can be shortened, and the use reliability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of water heaters, in particular to a water heater and an inner tank thereof. Background Art

[0002] Existing water heaters mainly include: gas water heaters, solar water heaters, electric water heaters and heat pump water heaters. Among them, electric water heaters are water heaters that use electricity as energy for heating. Among the existing electric water heaters, enamel inner tanks have been widely promoted and used due to their excellent corrosion resistance, long service life and low production cost.

[0003] Currently, if Figure 1 and Figure 2 As shown, the enamel inner tank 1 of the electric water heater usually adopts an end cover 19 with a convex and a concave structure. Overall, the enamel inner tank 1 is long, which leads to a longer size of the entire machine, which in turn leads to problems such as low material utilization and easy installation restrictions.

[0004] Therefore, it is necessary to provide a water heater and an inner tank thereof to solve at least one of the above problems. Utility Model Content

[0005] In view of the defects existing in the prior art, the embodiments of the utility model provide a water heater and an inner tank thereof using the spraying process, which can effectively improve the material utilization rate of the inner tank and reduce the cost. For an inner tank with a predetermined length and cross-sectional size, it can increase the volume of the inner tank; or for an inner tank with a predetermined volume and cross-sectional size, it can shorten the length of the inner tank and has high reliability during use.

[0006] The specific technical solution of the implementation mode of the utility model is:

[0007] A water heater inner tank, the water heater inner tank comprising: a cylinder, and a first end cover and a second end cover arranged at both ends of the cylinder, the first end cover and the second end cover are respectively connected to the cylinder, and the first end cover and the second end cover protrude in a direction away from the cylinder; the first end cover is provided with at least one mounting hole for assembling functional components; the second end cover is provided with an opening, the opening is used for allowing an enameling device to extend into the inner tank during the manufacturing process of the inner tank to perform enameling treatment on the inner surface of the inner tank; a blocking piece fixedly connected to the opening is provided at the opening; the inner surface of the inner tank has an enamel coating, and the enamel coating is formed by the enameling treatment.

[0008] In a preferred embodiment, the functional component includes an electric heating element, and the electric heating element is installed at the installation hole.

[0009] In a preferred embodiment, the electric heating element comprises a first electric heating element and a second electric heating element, and the first electric heating element and the second electric heating element are staggered.

[0010] In a preferred embodiment, the functional component further includes at least one of the following: an electronic anode, a physical anode, a temperature detection element, and a high temperature protection element.

[0011] In a preferred embodiment, the opening has a flange bent toward the outside of the inner container; the blocking member is sealed and fixed to the opening via the flange.

[0012] In a preferred embodiment, the blocking member is a cover body protruding toward the interior of the water heater tank, the surface of the cover body facing the interior of the tank has an enamel coating, and the outer edge of the cover body is higher than the flange.

[0013] In a preferred embodiment, a first welding portion is formed between an outer edge portion of the cover body that is higher than the flange and the flange.

[0014] In a preferred embodiment, the blocking member is a cover body protruding toward the interior of the water heater tank, the surface of the cover body facing the interior of the tank has an enamel coating, and the outer edge of the cover body is flush with the flange.

[0015] In a preferred embodiment, a first welding portion is formed on the outer edge of the cover body and the flange on the flush end surfaces.

[0016] In a preferred embodiment, the distance between the first welding portion and the enamel coating on the inner surface of the liner near the opening is greater than the radiation radius of the welding heat affected zone; the distance between the first welding portion and the enamel coating on the surface of the cover body near the outer edge of the cover body is greater than the radiation radius of the welding heat affected zone.

[0017] In a preferred embodiment, the cylinder body and the first end cover and / or the second end cover are integrally formed.

[0018] In a preferred embodiment, the cylinder is fixedly connected to the first end cover and / or the second end cover.

[0019] In a preferred embodiment, a second welding portion is formed between the cylinder and the first end cover and / or between the cylinder and the second end cover.

[0020] In a preferred embodiment, the position where the first end cover and / or the second end cover is welded to the cylinder has an overlapping structure with partial structural overlap, and the second welding portion is located at the overlapping structure.

[0021] In a preferred embodiment, the outer diameter of the end of the first end cover and / or the second end cover is smaller than the inner diameter at the corresponding end of the cylinder, and the first end cover and / or the second end cover are partially inserted into the corresponding end of the cylinder to form the overlap structure.

[0022] In a preferred embodiment, the second welding portion is formed on the outer surface of the inner liner at the overlapping structure.

[0023] In a preferred embodiment, the second welding portion is formed at the end of the cylinder to weld the end of the cylinder to the outer surface of the first end cover and / or the second end cover adjacent to the end.

[0024] In a preferred embodiment, the cylinder is provided with a step portion near the end portion so that the inner diameter at both ends of the cylinder is larger than the inner diameter in the middle portion of the cylinder.

[0025] In a preferred embodiment, the opening is located at the center of the second end cover.

[0026] In a preferred embodiment, a matching groove for matching with an inner liner assembly tool is provided at the center of the blocking member.

[0027] In a preferred embodiment, the aperture of the opening is between 60 mm and 90 mm.

[0028] A water heater comprises any of the above-mentioned water heater inner tanks.

[0029] The technical solution of the utility model has the following significant beneficial effects:

[0030] The water heater tank provided in the embodiment of the present application is a tank with an enamel coating made by a spray pond process, and the tank includes a cylinder and a first end cover and a second end cover located at both ends of the cylinder. The first end cover is convexly arranged in a direction away from the cylinder; the second end cover is also convexly arranged in a direction away from the cylinder. When both end covers of the tank are convexly arranged downwardly away from the cylinder, the material utilization rate of the tank can be effectively improved, and the cost can be reduced. For a tank with a predetermined length and cross-sectional size, it can increase the volume of the tank; or for a tank with a predetermined volume and cross-sectional size, it can shorten the length of the tank, and the reliability is high during use.

[0031] An opening for enamelling is provided on the second end cover of the inner liner where no functional components are provided, and a plugging piece with a partial enamel layer is provided on the opening. The inner liner structure thus formed has an ingenious structural design, so that the manufacturing process and cost can be controlled within a relatively low range, while at the same time ensuring the high reliability of the inner liner.

[0032] With reference to the following description and drawings, specific embodiments of the present invention are disclosed in detail, indicating the manner in which the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope. Within the spirit and scope of the appended claims, the embodiments of the present invention include many changes, modifications and equivalents. Features described and / or shown for one embodiment can be used in one or more other embodiments in the same or similar manner, combined with features in other embodiments, or replace features in other embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. Under the guidance of the present invention, those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to specific circumstances.

[0034] Figure 1 It is a structural schematic diagram of a water heater inner tank provided in the prior art;

[0035] Figure 2 for Figure 1 Sectional view at AA;

[0036] Figure 3 A schematic diagram of the structure of a water heater tank provided in an embodiment of the present application;

[0037] Figure 4 for Figure 3 Sectional view at the middle BB;

[0038] Figure 5 A schematic diagram of the structure of another water heater tank provided in an embodiment of the present application;

[0039] Figure 6 for Figure 5 Sectional view at CC;

[0040] Figure 7 for Figure 6 A partial enlarged view of point D in the middle;

[0041] Figure 8 for Figure 6 A partial enlarged view of point F in the middle;

[0042] Fig. 9 A schematic diagram of the structure of a water heater provided in an embodiment of the present application;

[0043] Fig.10 for Fig. 9 A partial enlarged view of the EE in the middle;

[0044] Fig.11 for Fig. 9 Right view in.

[0045] Description of the accompanying drawings in the prior art:

[0046] 1. Enamel liner;

[0047] 19. End cap;

[0048] Description of the accompanying drawings in this application:

[0049] 10. Cylinder;

[0050] 11. First end cover;

[0051] 12. Second end cover;

[0052] 110. Mounting hole;

[0053] 120, opening;

[0054] 121, Flanging;

[0055] 1211, first flange portion;

[0056] 1212, second flange portion;

[0057] 13. Blocking parts;

[0058] 130, matching groove;

[0059] 131. Central blocking part;

[0060] 132, the outer edge of the cover;

[0061] 14. The first welding part;

[0062] 141. Welding heat affected zone;

[0063] 15. Second welding part;

[0064] 101, step part;

[0065] 21. a first electric heating element;

[0066] 22. a second electric heating element;

[0067] 23. Electronic anode;

[0068] 24. Physical anode;

[0069] 25. Temperature detection parts;

[0070] 26. High temperature protection element;

[0071] 27. Water inlet assembly;

[0072] 28. Water outlet assembly. DETAILED DESCRIPTION

[0073] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art fall within the scope defined by the claims attached to this application.

[0074] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0075] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0076] The utility model provides a water heater and an inner tank thereof using the spraying process, which can effectively improve the material utilization rate of the inner tank and reduce the cost. For an inner tank with a predetermined length and cross-sectional size, it can increase the volume of the inner tank; or for an inner tank with a predetermined volume and cross-sectional size, it can shorten the length of the inner tank and has high reliability during use.

[0077] Please refer to Figures 3 to 11In an embodiment of the specification of the present application, a water heater inner tank is provided, which may include: a cylinder 10, and a first end cover 11 and a second end cover 12 arranged at both ends of the cylinder 10, the first end cover 11 and the second end cover 12 are respectively connected to the cylinder 10, and the first end cover 11 and the second end cover 12 are protruded in a direction away from the cylinder 10; the first end cover 11 is provided with at least one mounting hole 110 for assembling functional components; the second end cover 12 is provided with an opening 120, and the opening 120 is used for allowing an enameling device to extend into the inner tank during the manufacturing process of the inner tank to perform enameling treatment on the inner surface of the inner tank; a blocking member 13 fixedly connected to the opening 120 is provided at the opening 120; the inner surface of the inner tank has an enamel coating, and the enamel coating is formed by the enameling treatment.

[0078] In the embodiment of the present application, the tank body of the water heater tank can be made of low-cost low-carbon steel or other materials. An enamel coating is provided on the inner surface of the tank, and the enamel coating can be formed by the spraying treatment. The enamel coating can protect the tank and prevent the low-carbon steel from directly contacting the water in the tank and corroding.

[0079] The inner tank of the water heater may be a horizontal inner tank with its axis approximately parallel to the horizontal plane, or a vertical inner tank with its axis approximately parallel to the gravity direction. In the embodiments of the present application, the description is mainly based on the horizontal inner tank.

[0080] The inner liner comprises a cylinder 10 and a first end cap 11 and a second end cap 12 located at both ends of the cylinder 10. The first end cap 11 is convexly arranged in a direction away from the cylinder 10; the second end cap 12 is also convexly arranged in a direction away from the cylinder 10. When both end caps of the inner liner are convexly arranged in a direction away from the cylinder 10, the material utilization rate of the inner liner can be effectively improved, the cost can be reduced, and for an inner liner with a predetermined length and cross-sectional size, the inner liner volume can be increased; or for an inner liner with a predetermined volume and cross-sectional size, the inner liner length can be shortened, and the reliability during use is high.

[0081] Please refer to Fig. 9 , Fig.10 and Fig.11 , wherein the first end cover 11 is used to install the functional components of the water heater. The first end cover 11 is provided with at least one installation hole 110 for assembling the functional components. The specific form, size and number of the installation hole 110 may vary according to the different functional components installed.

[0082] Specifically, the functional component may include an electric heating element, and the electric heating element is installed at the installation hole 110 .

[0083] The electric heating element is a component that converts electrical energy into thermal energy. The electric heating element contacts the water in the inner pot, and after the heat energy generated by the electric heating element is transferred to the water in the inner pot, the water in the inner pot can be heated. One end of the electric heating element is fixed to the first end cover 11 through the mounting hole 110, and the other end extends into the water in the inner pot.

[0084] The water heater is provided with a controller. Specifically, the controller can be in the form of a main control board, which can be integrated on the box of the water heater. Of course, the specific form and setting position of the controller are not limited to the above examples, and those skilled in the art can make adaptive adjustments according to actual design requirements. The electric heating element is electrically connected to the controller. When an unexpected situation occurs, the controller can control the electric heating element to stop working after receiving an electrical signal to prevent it from dry burning.

[0085] The electric heating element can be divided into a metal electric heating element and a non-metal electric heating element according to its material. The material of the metal electric heating element may be: nickel-chromium wire (Ni-Cr), iron-chromium-aluminum wire (Fe-Cr-Al), nickel-iron wire (Ni-Fe), nickel-copper wire (Ni-Cu), etc. The non-metal electric heating element may be: silicon carbide, silicon-molybdenum rod, PTC electric heating element, electric heating paint, etc. The specific material of the electric heating element is not limited in this application. For example, the electric heating element may be a metal heating rod or a tubular electric heating tube. The metal electric heating tube is a sealed electric heating element that is widely used, simple in structure, reliable in performance, and has a long service life among all current electric heating elements.

[0086] In addition, the number of the electric heating elements may be one or more.

[0087] In one embodiment, the electric heating element comprises: a first electric heating element 21 and a second electric heating element 22 , and the first electric heating element 21 and the second electric heating element 22 are staggered.

[0088] When there are multiple electric heating elements, the present application takes two as an example for illustration.

[0089] like Fig.11As shown, when the inner tank is a horizontal inner tank, the two electric heating elements can be staggered and distributed along the direction of gravity, and multiple electric heating elements are electrically connected to the controller. The controller can control the positions and numbers of the electric heating elements to be turned on, so as to meet the different water outlet requirements of the water heater. For example, when the first electric heating element 21 and the second electric heating element 22 are turned on at the same time, the rapid heating requirement can be met; when the water temperature in the inner tank is close to the preset water outlet temperature set by the user, only one of the electric heating elements can be controlled to work; when the water temperature in the inner tank has reached the preset water outlet temperature set by the user, but the user currently has no water demand, one of the electric heating elements can be controlled to heat intermittently to maintain the water temperature in the inner tank above a certain temperature.

[0090] When the electric heating element includes a first electric heating element 21 and a second electric heating element 22, the mounting hole 110 includes a first mounting hole for mounting the first electric heating element 21 and a second mounting hole for mounting the second electric heating element 22. The specific positions of the first mounting hole and the second mounting hole can be comprehensively determined according to the spacing distance that the electric heating elements need to meet in space, etc., and the present application does not make specific limitations here.

[0091] In some embodiments, the functional component further includes at least one of the following: an electronic anode 23 , a physical anode 24 , a temperature detection element 25 , and a high temperature protection element 26 .

[0092] The functional component may further include an electronic anode 23. When the functional component includes the electronic anode 23, the mounting hole 110 further includes a third mounting hole for mounting the electronic anode 23, and the electronic anode 23 is mounted on the first end cover 11 through the third mounting hole and extends into the inner tank of the water heater. Taking the inner tank as a horizontal inner tank as an example, the position of the electronic anode 23 in the inner tank of the water heater is higher than the electric heating element along the gravity direction.

[0093] The electronic anode 23 can be in the shape of a tube or other shapes as a whole, with one end fixed on the first end cover 11 and the other end extending into the water in the inner tank. The end of the electronic anode 23 fixed to the inner tank is electrically connected to the controller. The position of the electronic anode 23 in the inner tank is higher than the position of the electric heating element in the vertical direction. This helps to ensure that when the electronic anode 23 is exposed to the water surface, the electric heating element is at least not completely exposed to the water surface. Furthermore, the electronic anode 23 extends in the same direction or towards the electric heating element. When the electronic anode 23 extends in the same direction or towards the electric heating element, it is helpful to control the height difference between the electronic anode 23 and the electric heating element, thereby ensuring the reliability of the installation process and the working process of the electric water heater.

[0094] The electronic anode 23 can be used to prevent the inner tank from corrosion. Based on existing experiments and theories, the electronic anode 23 has a longer service life than the existing physical anode 24, such as a magnesium rod, and has a better anti-corrosion effect.

[0095] The electronic anode 23 can not only be used to prevent the inner pot from corrosion, but also be used to detect the change of the water level in the inner pot, which is equivalent to the function of a liquid level sensor. The specific principle of the electronic anode 23 being able to detect the change of the water level in the inner pot is as follows:

[0096] The controller is electrically connected to the electronic anode 23. When the electronic anode 23 is working, if the electronic anode 23 contacts the water in the inner tank, it will continue to undergo electrochemical reactions to form a current loop, and a certain voltage will be formed on the electronic anode 23 accordingly, so that it can be detected by the controller; if the electronic anode 23 is separated from the water surface, the voltage immediately fed back to the controller by the electronic anode 23 will have a sudden change from high to low or even from existence to non-existence, or in other words, the current fed back to the controller by the electronic anode 23 will also have a sudden change from large to small or even from existence to non-existence. When the controller receives the voltage / current change signal when the electronic anode 23 is separated from the water surface, it sends an electrical signal to the electric heating element, which can control the electric heating element to stop working, thereby having anti-dry burning and anti-explosion functions, and high safety performance.

[0097] A liquid level sensor may also be provided in the inner tank to detect water level changes, but the liquid level sensor is prone to scale on the surface during use and is prone to failure after a period of use. When the electronic anode 23 is used in the utility model to detect water level changes, since its surface is acidic and not easy to scale, it is not easy to fail due to scaling during use. In addition, the electronic anode 23 can simultaneously realize the functions of anti-corrosion and detecting water level changes, which can simplify the structure and save costs.

[0098] In some embodiments, the functional component may further include: a physical anode 24 .

[0099] The material of the physical anode 24 can be a low-potential metal material, specifically magnesium, magnesium alloy, pure zinc, zinc alloy, aluminum alloy, etc. When the electric water heater is powered off, the physical anode 24 in the water can continue to undergo electrochemical reactions, thereby preventing the inner tank from being corroded.

[0100] When the functional component includes a physical anode 24, the mounting hole 110 may further include a fourth mounting hole for mounting the physical anode 24. The physical anode 24 is mounted on the first end cover 11 through the fourth mounting hole and extends into the inner tank of the water heater.

[0101] In some embodiments, the functional component may further include: a high temperature protection element 26. The high temperature protection element 26 may be used to control the on-off relationship of the circuit between the power line and the controller. When the temperature in the inner tank exceeds the preset safety temperature, the high temperature protection element 26 may cut off the circuit between the power line and the main control board, which is equivalent to stopping the power supply to the water heater. The specific value of the preset safety temperature may vary depending on the detection position, detection principle, etc. inside the water heater, and the present application does not make any specific limitation here.

[0102] In the embodiment of the present application, the second end cover 12 is provided with an opening 120 with a predetermined aperture, and the opening 120 is used for allowing the spraying equipment to extend into the inner liner during the manufacturing process of the inner liner to spray the inner surface of the inner liner. Among them, the opening 120 can be located at the center of the second end cover 12, and of course it can also be located at a non-central position of the second end cover 12. When the opening 120 is located at the center of the second end cover 12, after the spraying equipment extends through the center position, the spraying equipment and the inner liner rotate circumferentially relative to each other, for example, the inner liner does not move, and the spraying equipment rotates circumferentially, that is, the inside of the inner liner can be sprayed uniformly. In addition, when the opening 120 is located at the center of the second end cover 12, the blocking member 13 fixedly connected to the opening 120 is also located at the center of the second end cover 12. Among them, the fixed connection method can be welding, or other connection methods. In the embodiment of the present application, the fixed connection method is mainly illustrated by welding.

[0103] When the sealing piece 13 is welded at the position of the opening 120 after the spraying is completed, a supporting force can be applied to the inner liner at the center of the two end covers of the inner liner along the axial direction of the inner liner, and the inner liner can be rotated circumferentially around the axis as the rotation axis, thereby achieving circumferentially uniform welding of the sealing piece 13 and the inner liner.

[0104] In some embodiments, the aperture of the opening 120 is between 60 mm and 90 mm.

[0105] In order to smoothly extend the enameling equipment into the inner tank through the opening 120, the aperture of the opening 120 needs to be set to at least 60 mm; when the aperture of the opening 120 is appropriately enlarged on the basis of 60 mm, the aperture of the opening 120 can be appropriately increased without affecting the strength of the entire second end cover 12, the welding reliability and increasing the welding workload too much, so that after the enameling equipment is extended into the inner tank through the opening 120, there is still a certain adjustment margin.

[0106] The blocking member 13 may be a cover body structure matching the opening 120. Specifically, the blocking member 13 is a cover body protruding toward the inner tank of the water heater, and the surface of the cover body facing the inner tank has an enamel coating. Since the inner tank is a pressure-bearing structure, the blocking member 13 arranged on the inner tank opening 120 is also a pressure-bearing structure, and the thickness of the blocking member 13 needs to meet certain strength requirements. Specifically, the thickness of the blocking member 13 may be at least 2 mm.

[0107] Theoretically, the thickness of the plugging piece 13 is proportional to the volume of the inner liner, and the thickness of the plugging piece 13 is proportional to the diameter of the plugging piece 13. The larger the volume of the inner liner (mainly the larger the diameter of the inner liner), the greater the deformation near the plugging piece 13 will be, the higher the strength requirement for the plugging piece 13, and the thicker the wall of the plugging piece 13 will be; the larger the diameter of the plugging piece 13, the weaker the strength, and the thicker the wall required.

[0108] Please refer to Figure 6 The center of the plugging piece 13 is provided with a matching groove 130 for matching with the inner liner assembly tool. The center of the plugging piece 13 is formed with a conical groove protruding toward the inner liner, and the conical groove can match with the top of the inner liner assembly tool, so as to facilitate the subsequent welding of the plugging piece 13 and the liner wall at the opening 120 of the liner.

[0109] The embodiment of the present application provides a water heater inner tank using a spraying process, wherein the first end cover 11 and the second end cover 12 of the inner tank protrude in a direction away from the cylinder 10; wherein the first end cover 11 is used to install functional components, and the second end cover 12 is provided with an opening 120 for allowing a spraying device to extend into the inner tank to spray the inner surface of the inner tank, and a plugging member 13 is fixedly connected to the opening 120. Overall, the water heater inner tank using the above structure can effectively improve the material utilization rate of the inner tank and reduce the cost. For an inner tank with a predetermined length and cross-sectional size, it can increase the volume of the inner tank; or for an inner tank with a predetermined volume and cross-sectional size, it can shorten the length of the inner tank and has high reliability during use.

[0110] In some embodiments, the opening 120 has a flange 121 bent toward the outside of the inner container; the blocking member 13 is sealed and fixed to the opening 120 via the flange 121 .

[0111] In this embodiment, the second end cover 12 may be provided with a flange 121 at the opening 120, and the flange 121 is used for sealing and fixing with the plugging member 13. Specifically, when the sealing and fixing method is welding, the flange 121 cooperates with the plugging member 13, and welding can be performed without affecting the enamel coating on the inner surface.

[0112] like Figure 7 As shown, an annular cavity structure is formed at the flange 121, and the cross section of the annular cavity structure can be a variable cross section structure with a smaller cross section in the middle and larger cross sections at both ends. The variable cross section structure can be used to form a matching structure that is conducive to limiting and sealing between the plugging member 13. Specifically, the flange 121 can be a bending structure formed outwardly by the gallbladder wall of the second end cover 12 at the opening 120, and the bending structure includes a first flange portion 1211 connected to the arc surface of the second end cover 12 and a second flange portion 1212 connected to the first flange portion 1211.

[0113] The second flange portion 1212 is used to cooperate with the blocking member 13, and the second flange portion 1212 can be used to limit the travel of the blocking member 13. Specifically, part of the inner wall of the second flange portion 1212 can be used to abut against part of the outer wall of the blocking member 13. For example, when the blocking member 13 is mounted on the inner liner through the flange 121, when part of the outer wall of the blocking member 13 contacts part of the inner wall of the second flange portion 1212, it indicates that the two are assembled in place. Among them, the inner wall against which the second flange portion 1212 abuts against the blocking member 13 can be the part where the second flange portion 1212 and the first flange portion 1211 intersect.

[0114] In a specific embodiment, the second flange portion 1212 may have a certain inclination angle; accordingly, the outer edge 132 of the cover body of the blocking member 13 also has a certain inclination angle, and the inclination angle of the second flange portion 1212 matches (is the same as) the inclination angle of the outer edge 132 of the cover body. When the blocking member 13 is assembled with the flange 121, since the two are set with matching inclination angles, the blocking member 13 can be automatically installed in place when inserted into the flange 121.

[0115] In order to prevent the enamel coating at the flange 121 from being damaged when the blocking member 13 cooperates with the flange 121, the inner container may be provided with a partial enamel coating at the flange 121. The surface of the cover of the blocking member 13 facing the inner container may also be partially provided with an enamel coating.

[0116] Specifically, the first flange portion 1211 may be a hollow annular structure as a whole, and the single-side cross-sectional structure of the first flange portion 1211 may include at least one arc. The second flange portion 1212 may also be a hollow annular structure as a whole, and the single-side cross-sectional structure of the second flange portion 1212 may be a straight inclined extension structure, or a structure formed by connecting multiple arcs of different diameters, or a structure formed by combining a straight inclined extension structure with an arc connection structure, etc.

[0117] Since the plugging piece 13 and the flange 121 have abutting portion after being assembled, a boundary position between the inner and outer boundaries is formed at the abutting portion. In order to ensure that the enamel coating within the boundary position is not damaged when the plugging piece 13 and the flange 121 are matched, the enamel coating can be provided only on the plugging piece 13 and the flange 121 within the boundary position.

[0118] Specifically, when the sealing member 13 and the flange 121 are assembled in place, the outer edge 132 of the cover body of the sealing member 13 abuts against the flange 121 (for example, the second flange portion 1212). At this time, the boundary position of the enamel coating on the flange 121 is exactly in contact with the boundary position of the enamel coating on the sealing member 13 or there is a small gap, that is, the enamel coating on the sealing member 13 can be in contact with or nearly in contact with the enamel coating at the flange 121, thereby avoiding contact between the sealing member 13 and the enamel coating of the flange 121 and damaging the enamel coating; in addition, the inner surface of the liner can be completely covered or nearly completely covered with the enamel coating, thereby improving the corrosion resistance of the liner.

[0119] Please refer to Figure 3 to Figure 4 In one embodiment, the blocking member 13 is a cover body protruding toward the inner tank of the water heater, the surface of the cover body facing the inner tank has an enamel coating, and the outer edge 132 of the cover body is flush with the flange 121.

[0120] In this embodiment, the outer edge 132 of the cover body can be flush or nearly flush with the flange 121. When welding the sealing member 13 to the flange 121 of the inner pot, the welding gun can be directly facing the junction of the outer edge 132 of the cover body and the flange 121. A first welding portion 14 is formed on the end surface where the outer edge 132 of the cover body is flush with the flange 121. Since the position where the first welding portion 14 is formed is far away from the enamel coating position of the cover body and the inner pot, the influence on the enamel coating of the cover body and the inner pot can be greatly reduced in the process of forming the first welding portion 14.

[0121] Please refer to Figures 5 and 6 In one embodiment, the blocking member 13 is a cover body protruding toward the inner tank of the water heater, the surface of the cover body facing the inner tank has an enamel coating, and the outer edge 132 of the cover body is higher than the flange 121.

[0122] For the structure in which the outer edge 132 of the cover is higher than the flange 121, as shown in FIG. Figure 7 As shown, a first welding portion 14 is formed between the outer edge portion of the cover body that is higher than the flange 121 and the flange 121 .

[0123] In this embodiment, the enamel coatings provided on the plugging member 13 and the flange 121 are respectively located within the abutting junction of the two. The outer edge of the flange 121 is welded to the outer edge of the plugging member 13 higher than the flange 121. The welding position is at a certain distance from the flange 121 and the enamel coating on the plugging member 13, which can ensure that less heat generated during welding is radiated to the enamel coating.

[0124] In a specific embodiment, the distance between the first welding portion 14 and the enamel coating on the inner surface of the liner near the opening 120 is greater than the radiation radius of the welding heat affected zone 141, and the distance between the first welding portion 14 and the enamel coating on the surface of the cover body near the second end cover 12 is greater than the radiation radius of the welding heat affected zone 141.

[0125] During welding, a welding heat affected zone 141 will be formed outwardly with the welding position as the center. For a specific welding device, the welding heat affected zone 141 generated during welding has a predetermined radiation radius. In order to ensure that the enamel coating is not affected when the first welding portion 14 is formed, the distance between the first welding portion 14 and the enamel coating on the inner surface of the liner near the opening 120 is greater than the radiation radius of the welding heat affected zone 141, and the distance between the first welding portion 14 and the enamel coating on the surface of the cover body near the second end cover 12 is greater than the radiation radius of the welding heat affected zone 141.

[0126] In some embodiments, the barrel 10 is integrally formed with the first end cap 11 and / or the second end cap 12. The barrel 10 may be integrally formed with at least one of the first end cap 11 and the second end cap 12. For example, the barrel 10 may be integrally formed with the first end cap 11 and fixedly connected with the second end cap 12; or, the barrel 10 may be integrally formed with the second end cap 12 and fixedly connected with the first end cap 11, or, the barrel 10 may be integrally formed with both the first end cap 11 and the second end cap 12.

[0127] In other embodiments, the barrel 10 is fixedly connected to the first end cap 11 and / or the second end cap 12. The barrel 10 may be fixedly connected to at least one of the first end cap 11 and the second end cap 12. For example, the barrel 10 may be fixedly connected to the first end cap 11, or the barrel 10 may be fixedly connected to the second end cap 12, or the barrel 10 may be fixedly connected to both the first end cap 11 and the second end cap 12.

[0128] The fixed connection method may be welding. Of course, the specific method of the fixed connection may be other methods, not limited to the above description, and technicians in the relevant field may make other changes inspired by the technical essence of this application, but as long as the functions and effects achieved are the same or similar to those of this application, they should be included in the protection scope of this application.

[0129] like Figure 8 As shown, in one embodiment, a second welding portion 15 is formed between the cylinder 10 and the first end cover 11 and / or between the cylinder 10 and the second end cover 12 .

[0130] When the cylinder 10 is welded to the first end cover 11, a second welding portion 15 is formed at the welding position of the cylinder 10 and the first end cover 11; similarly, when the cylinder 10 is welded to the second end cover 12, a second welding portion 15 is formed at the welding position of the cylinder 10 and the second end cover 12. When the second welding portion 15 is formed between the cylinder 10 and the first end cover 11 and / or the cylinder 10 and the second end cover 12, the position where the first end cover 11 and / or the second end cover 12 are welded to the cylinder 10 has a lap joint structure with partial structural overlap, and the second welding portion 15 is located at the lap joint structure.

[0131] Among them, the specific methods of welding the cylinder 10 to the first end cover 11 and the second end cover 12 can refer to each other. In the implementation mode of the present application, the welding of the cylinder 10 and the first end cover 11 is mainly used as an example for explanation. The implementation method of welding the cylinder 10 and the second end cover 12 can refer to the implementation method of welding the cylinder 10 and the first end cover 11.

[0132] In one embodiment, the outer diameter of the end of the first end cover 11 and / or the second end cover 12 is smaller than the inner diameter at the corresponding end of the cylinder 10, and the first end cover 11 and / or the second end cover 12 are partially inserted into the corresponding end of the cylinder 10 to form the overlap structure.

[0133] In this embodiment, taking the first end cover 11 as an example, the outer diameter of the end of the first end cover 11 is smaller than the inner diameter of the end of the cylinder 10 where it cooperates with the first end cover 11, so that part of the first end cover 11 can be inserted into the end of the cylinder 10, thereby forming a lap joint structure.

[0134] Taking the second end cover 12 as an example, the outer diameter of the end of the second end cover 12 is smaller than the inner diameter of the end of the cylinder 10 where it cooperates with the second end cover 12, so that part of the second end cover 12 can be inserted into the end of the cylinder 10, thereby forming a lap joint structure.

[0135] Specifically, the second welding part 15 is formed on the outer surface of the inner container at the overlap structure. The second welding part 15 is formed at the overlap structure and is located on the outer surface of the inner container. Such a configuration can facilitate welding between the inner container and the first end cover 11 and the second end cover 12; in addition, since the surface shape of the welding structure is usually difficult to control, when the welding structure is arranged on the outer surface of the inner container, it can facilitate the subsequent formation of a stable enamel coating structure on the inner surface of the inner container, facilitate welding operations, and prevent water in the inner container from directly contacting the second welding part to corrode the second welding part.

[0136] Specifically, Figure 8 As shown, the second welding portion 15 is formed at the end of the cylinder 10 to weld the end of the cylinder 10 to the outer surface of the first end cover 11 and / or the second end cover 12 adjacent to the end.

[0137] When the second welding portion 15 is formed at the end of the cylinder 10, welding can be performed between the end of the cylinder 10 and the outer surface of the end cover to be welded, thereby improving the reliability of the welding position and reducing the difficulty of the welding operation.

[0138] In a specific embodiment, the cylinder 10 is provided with a step portion 101 near the end thereof, so that the inner diameters at both ends of the cylinder 10 are larger than the inner diameter of the middle portion of the cylinder 10 .

[0139] In this embodiment, a step portion 101 may be provided near the end of the cylinder 10, and the inner diameter of the step portion 101 is larger than the inner diameter of the middle of the cylinder 10. By providing the step portion 101 near the end of the cylinder 10, the inner diameter of the cylinder 10 near the end may be enlarged, so that the end cap may be inserted into the end of the cylinder 10. In addition, by providing the step portion 101, a pre-tightening force may be applied to the end cap, so that when the end cap is inserted into the cylinder 10 for welding, the matching position of the two is relatively stable and not prone to displacement, thereby ensuring the welding accuracy.

[0140] like Fig. 9 , Fig.10 and Fig.11 In the embodiment of the present application, a water heater is also provided, and the water heater mainly includes the above-mentioned water heater inner tank. The water heater can achieve the technical effect achieved by the water heater inner tank embodiment by setting the water heater inner tank. For details, please refer to the specific description of the above-mentioned embodiment, and the present application will not repeat it here. In addition, for the water heater, a water inlet component 27 for supplying water from an external source into the inner tank, and a water outlet component 28 for outputting the heated water in the inner tank and other components are also installed on the cylinder 10.

[0141] It should be noted that, in the description of this application, the terms "first", "second", etc. are only used for descriptive purposes and to distinguish similar objects. There is no order of precedence between the two, and they cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0142] The above-mentioned various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0143] The above are only a few embodiments of the present invention. Although the embodiments disclosed by the present invention are as above, the contents are only embodiments adopted for facilitating the understanding of the present invention and are not used to limit the present invention. Any technician in the technical field to which the present invention belongs can make any modification and change in the form and details of the implementation without departing from the spirit and scope disclosed by the present invention, but the scope of patent protection of the present invention shall still be subject to the scope defined by the attached claims.

Claims

1. A water heater tank, characterized in that: The inner container comprises: a cylinder, and a first end cover and a second end cover arranged at both ends of the cylinder, the first end cover and the second end cover are respectively connected to the cylinder, and the first end cover and the second end cover are protruding in a direction away from the cylinder; The first end cover is provided with at least one mounting hole for assembling a functional component; The second end cover is provided with an opening, and the opening is used for allowing an enameling device to extend into the inner liner to perform enameling treatment on the inner surface of the inner liner during the manufacturing process of the inner liner; a sealing member fixedly connected to the opening is provided at the opening; the inner surface of the inner liner has an enamel coating, and the enamel coating is formed by the enameling treatment.

2. The water heater inner tank as claimed in claim 1, characterized in that: The functional component comprises an electric heating element, and the electric heating element is installed at the installation hole.

3. The water heater inner tank as claimed in claim 2, characterized in that: The electric heating element comprises a first electric heating element and a second electric heating element, and the first electric heating element and the second electric heating element are staggered.

4. The water heater inner tank as claimed in claim 2, characterized in that: The functional component further includes at least one of the following: an electronic anode, a physical anode, a temperature detection component, and a high temperature protection element.

5. The water heater inner tank as claimed in claim 1, characterized in that: The opening has a flange bent toward the outside of the inner container; the blocking member is sealed and fixed to the opening through the flange.

6. The water heater inner tank as claimed in claim 5, characterized in that: The blocking member is a cover body protruding toward the inner tank of the water heater as a whole, the surface of the cover body facing the inner tank has an enamel coating, and the outer edge of the cover body is higher than the flange.

7. The water heater inner tank as claimed in claim 6, characterized in that: A first welding portion is formed between the outer edge portion of the cover body that is higher than the flange and the flange.

8. The water heater inner tank as claimed in claim 5, characterized in that: The blocking member is a cover body protruding toward the inner tank of the water heater as a whole, the surface of the cover body facing the inner tank has an enamel coating, and the outer edge of the cover body is flush with the flange.

9. The water heater inner tank as claimed in claim 8, characterized in that: The outer edge of the cover body and the flange form a first welding portion on the flush end surface.

10. The water heater inner tank according to claim 7 or 9, characterized in that: The distance between the first welding portion and the enamel coating on the inner surface of the liner near the opening is greater than the radiation radius of the welding heat affected zone; the distance between the first welding portion and the enamel coating on the surface of the cover body near the outer edge of the cover body is greater than the radiation radius of the welding heat affected zone.

11. The water heater inner tank according to claim 1, characterized in that: The cylinder body is integrally formed with the first end cover and / or the second end cover.

12. The water heater inner tank as claimed in claim 1, characterized in that: The cylinder is fixedly connected to the first end cover and / or the second end cover.

13. The water heater inner tank as claimed in claim 12, characterized in that: A second welding portion is formed between the cylinder and the first end cover and / or between the cylinder and the second end cover.

14. The water heater inner tank as claimed in claim 13, characterized in that: The position where the first end cover and / or the second end cover is welded to the cylinder has an overlapping structure with partial structural overlap, and the second welding portion is located at the overlapping structure.

15. The water heater inner tank as claimed in claim 14, characterized in that: The outer diameter of the end of the first end cover and / or the second end cover is smaller than the inner diameter at the corresponding end of the cylinder, and the first end cover and / or the second end cover are partially inserted into the corresponding end of the cylinder to form the overlapping structure.

16. The water heater inner tank as claimed in claim 14, characterized in that: The second welding portion is formed on the outer surface of the inner container at the overlapping structure.

17. The water heater inner tank as claimed in claim 14, characterized in that: The second welding portion is formed at an end of the cylinder to weld the end of the cylinder to an outer surface of the first end cover and / or the second end cover adjacent to the end.

18. The water heater inner tank as claimed in claim 15, characterized in that: The cylinder is provided with a step portion at a position adjacent to the end portion so that the inner diameters at both ends of the cylinder are larger than the inner diameter of the middle portion of the cylinder.

19. The water heater inner tank as claimed in claim 1, characterized in that: The opening is located at the center of the second end cover.

20. The water heater inner tank as claimed in claim 19, characterized in that: The center of the blocking piece is provided with a matching groove for matching with the inner liner assembly tooling.

21. The water heater inner tank as claimed in claim 19, characterized in that: The aperture of the opening is between 60 mm and 90 mm.

22. A water heater, characterized in that: It comprises the water heater inner tank as described in any one of claims 1 to 21.

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