A non-metal inner container for a water heater, a non-metal inner container assembly structure and a water heater

Abstract

A kind of non-metal inner container for water heater, including inner container matrix and fiber layer, the inner container matrix is opened with container mouth, the edge of the container mouth extends outward and forms container mouth flange protruding from the inner container matrix, the fiber layer is wrapped in the outer surface of the inner container matrix, the outer edge of the cross section of the container mouth flange at any position away from the container mouth does not exceed the outer edge of the cross section of the container mouth flange at the location of the container mouth.The technical scheme provided by the utility model has the following advantages compared with prior art:low cost, simple and ingenious structure, simple process steps and low process difficulty, easy and fast assembly, strong stress resistance, strong ability to adapt to repeated expansion and contraction of inner container, long service life.

Description

Technical Field

[0001] This utility model relates to the field of water heaters, and in particular to a non-metallic inner tank for a water heater and a non-metallic inner tank assembly structure, and a water heater. Background Technology

[0002] Water heaters, as essential household appliances in people's daily lives, boast a series of advantages such as high safety performance, wide applicability, and convenient and fast hot water supply. Especially popular are small kitchen water heaters, which can be installed in confined spaces and provide rapid and convenient hot water supply. With the continuous development of materials science, the water heater industry has also seen comprehensive technological innovations. For example, to reduce material costs, simplify manufacturing processes, and ensure clean and safe hot water quality, metal or enamel-lined tanks have been replaced with plastic tanks wrapped with fiber layers. This innovation inevitably raises new requirements for the plastic tanks and their associated assembly parts. For instance, how to simplify assembly steps, improve the stress resistance of the plastic tanks, and extend the product's lifespan through structural design of the plastic tanks and assembly parts.

[0003] For example, Chinese utility model patent CN223036616, entitled "A Non-metallic Inner Tank for a Water Heater," discloses: a non-metallic inner tank for a water heater, including an inner tank body (1), wherein an annular flange (20) extending outward and surrounding the inlet of the inner tank body (1) is provided on the inner side of the inlet, and an inlet flange (30) is provided on the outer side of the inlet of the inner tank body (1), and a flange reinforcing member (40) is sandwiched between the inlet flange (30) and the annular flange (20). The outer surface of the plastic layer (10) is provided with a flange that holds the plastic layer (10) and the inlet flange (30) together. The bottom is entirely wrapped with a fiber reinforcement layer (11) to improve sealing reliability. The flange reinforcement (40) has several connecting portions (41) around its periphery to increase the contact area with the top of the inner flange (30). Each connecting portion (41) has several second connecting holes (42) for connection and fixation with the inner flange (30). The top of the inner flange (30) has several first connecting holes (31) for connection and fixation with the flange reinforcement (40). The top of the inner flange (30) also has several through holes (32) for enhancing connection stability with the flange reinforcement (40). This utility model... The aforementioned technical solution requires the annular flange (20) to have a flanged structure, thereby clamping the flange reinforcement (40) between the inner flange (30) and the annular flange (20), which increases the difficulty of the process and makes the process steps more complicated. The second connecting hole (42) on the connecting part (41) of the flange reinforcement (40) is used to cooperate with the first connecting hole (42) to realize the connection between the flange reinforcement (40) and the inner flange (30), but it cannot limit the bolts passing through the through hole (32). Moreover, the flange reinforcement (40) cannot play any guiding role. Therefore, it makes the assembly difficult and time-consuming for workers.

[0004] For example, Chinese utility model patent CN221881798U, entitled "A Water Heater Inner Tank," discloses: a water heater inner tank, comprising: an inner tank body (1), one end of which is provided with a vent (101), and a first limiting annular groove (102) surrounding the vent (101) on the outside; a reinforcing layer (2), which covers the outer periphery of the inner tank body (1); a vent flange (3), which is disposed on the inner tank body (1), a portion of which is limited at the first limiting annular groove (102), and a portion of which is sandwiched between the inner tank body (1) and the reinforcing layer (2); the vent flange (3) The device includes a base (31) and a flange (32). The base (31) is disposed on the inner liner body (1). A portion of the base (31) is limited at the first limiting annular groove (102). A portion of the base (31) is sandwiched between the inner liner body (1) and the reinforcing layer (2). The flange (32) is fixedly connected to the base (31). The base (31) has a through hole (301) in the middle. A second limiting annular groove (302) is provided around the first through hole (301) on the outside. The flange (32) has a second through hole (303) in the middle. The flange (32) is sleeved on the base (31) and is limited at the second limiting annular groove (302). The inner liner body includes a liner body (11) and a liner opening everted structure (12). The liner opening everted structure (12) is disposed at one end of the liner body (11). The first limiting annular groove (102) is formed at the connection between the liner body (11) and the liner opening everted structure (12). The liner opening flange (3) is adapted to the first limiting annular groove (102). In the technical solution of this utility model, the inner liner body still needs to be everted to form the liner opening everted structure (12), which does not simplify the process steps or reduce the process difficulty. Moreover, the structural design of the flange (32) being limited at the second limiting annular groove (302) also increases the number of parts of the liner opening flange (3), complicates the structure, and increases the assembly difficulty.

[0005] For example, Chinese invention application CN114992860A, entitled "A Non-metallic Inner Liner," discloses: a non-metallic inner liner comprising: an inner liner body (10), one end of which has an opening (11), and a limiting annular portion (12) surrounding the opening (11); a reinforcing layer (20) covering the outer periphery of the inner liner body (10); and an inner liner flange (30), the inner end of which is limited and fixed by the limiting annular portion (12), and the outer end of which is fixed between the inner liner body (10) and the reinforcing layer (20). The technical solution described in this invention application also requires the formation of a limiting annular portion (12) to limit and fix the inner end of the inner liner flange (30), thus failing to reduce the manufacturing difficulty.

[0006] Finally, Chinese utility model patent CN220582768U, entitled "An Injection Molded Crystal Insulator," discloses: an injection molded crystal insulator comprising: an upper insulator and a lower insulator welded together, wherein the upper insulator has an opening opposite to the lower insulator and forms a cap; a flange, injection molded and embedded in the cap, wherein the inner peripheral wall of the flange has an inner extending edge, the inner extending edge being embedded in the cap, and the end face of the flange opposite to the interior of the upper insulator having multiple main top holes for mounting bolts. The end of the flange facing the interior of the upper insulator has a circumferentially outward extending side, the outer peripheral side of the circumferentially outward extending side extending beyond the outer peripheral side of the flange, the inner peripheral side of the circumferentially outward extending side being fixedly hooked to the inner extending edge, and the circumferentially outward extending side being embedded in the cap; the outer wall of the upper insulator is covered with a peripheral fiber layer, the peripheral fiber layer extending to the outer peripheral wall of the flange; the outer peripheral wall of the flange has a flange for clamping the flange in a mold, the flange being located outside the upper insulator. The technical solution described in this utility model embeds the flange into the end cap through injection molding. However, it still requires setting a flange on the upper liner, so it cannot reduce the difficulty of the process. Furthermore, when the crystal liner expands or contracts due to pressure changes, the flange injected into the end cap cannot adapt to these repeated changes, which can easily lead to structural breakage near the liner opening, resulting in crystal liner leakage and reduced service life. Utility Model Content

[0007] To address the shortcomings of existing technologies, this utility model provides a non-metallic inner tank for water heaters, as well as a non-metallic inner tank assembly structure and water heater, which features low cost, simple and ingenious structure, simple and easy process steps, convenient and quick assembly, strong stress resistance, strong ability to adapt to repeated expansion and contraction of the inner tank, and long service life.

[0008] The main technical solution adopted by this utility model is as follows: A non-metallic inner tank for a water heater includes an inner tank base and a fiber layer. The inner tank base has an opening, and the edge of the opening extends outward to form an opening flange protruding from the inner tank base. The fiber layer wraps around the outer surface of the inner tank base. The outer edge of the cross-section of the opening flange at any position away from the opening does not exceed the outer edge of the cross-section of the opening flange located at the opening.

[0009] The inner liner substrate also has outwardly extending inlet and outlet pipes.

[0010] The outer wall of the flange is one of the following shapes: cylindrical, conical, waisted, bottle-mouth, or dome-shaped with an open top.

[0011] The outer wall surface of the flange also has a concave-convex structure.

[0012] The inner wall of the flange is open and funnel-shaped.

[0013] In particular, an installation groove is formed around the outer surface of the inner liner substrate surrounding the liner flange.

[0014] A positioning protrusion is formed on the outer surface of the inner liner substrate opposite to the location of the liner opening, and a positioning groove is formed around the positioning protrusion.

[0015] A non-metallic inner tank assembly structure for a water heater, using the aforementioned non-metallic inner tank for water heaters.

[0016] A non-metallic inner tank assembly structure for a water heater, using the aforementioned non-metallic inner tank for water heaters.

[0017] It also includes an annular mounting flange fitted on the duct flange, the annular mounting flange including a fixing part including a reinforcing cylinder, the reinforcing cylinder being fitted around the duct flange.

[0018] The fixing part further includes a curved ring seat, which is at least partially embedded in the mounting groove, and the fiber layer presses against the edge of the curved ring seat.

[0019] It also includes a buffer layer, which is located at the intersection of the outer surface of the inner liner substrate and the edge of the curved ring seat, and the fiber layer presses down on the buffer layer.

[0020] The annular mounting flange further includes a mounting portion, which is provided on the curved annular seat at intervals along the circumferential direction of the reinforcing cylinder. The mounting portion also has a mounting cavity, and one end of the fastener is located in the mounting cavity.

[0021] The mounting cavity has a mounting hole on its top wall. The diameter of one end of the mounting hole is larger than the diameter of the other end of the mounting hole. One end of the fastener is inserted into the mounting cavity through one end of the mounting hole and is secured to the other end of the mounting hole.

[0022] It also includes a fixing ring, the inner peripheral wall of which abuts against the outer wall surface of the reinforcing cylinder, and the fixing ring has a fixing protrusion on the side facing the curved ring seat, the fixing protrusion being inserted into the gap between the mounting parts.

[0023] The fixing ring also has a fixing hole, and the other end of the fastener passes through the fixing hole to limit the position of the fastener.

[0024] It also includes a support base, a positioning hole is provided at the center of the support base, the positioning protrusion is inserted into the positioning hole, the support base is at least partially embedded in the positioning groove, and the fiber layer presses against the edge of the support base.

[0025] It also includes an inner bracket, one end of which is mounted on the support base, and the other end of which is connected to the outer bracket. The inner bracket has an overall T-shaped structure.

[0026] A water heater that uses the aforementioned non-metallic inner tank for water heaters.

[0027] A water heater employs the aforementioned non-metallic inner tank assembly structure for water heaters.

[0028] According to the technical solution described in this utility model, the following beneficial effects are achieved: The outer edge of the cross-section of the flange at any position away from the flange opening does not exceed the outer edge of the cross-section of the flange opening at the flange opening. Therefore, the flange opening no longer needs to form a flanged structure, simplifying the process steps and reducing the process difficulty. The subsequent annular mounting flange can be directly fitted onto the flange opening and pressed in place by the fiber layer without needing to rest against the flange. Therefore, the process steps do not necessarily need to follow the order of assembling the annular mounting flange first and then flanged, providing greater freedom in processing operations and improving the coordination efficiency between various processes. This provides favorable conditions; the inner liner substrate also forms outwardly extending inlet and outlet pipes, which extend from the inner liner substrate, thus eliminating the need for separate inlet and outlet pipe parts, reducing the number of parts and facilitating subsequent assembly; the reinforcing sleeve of the fixing part is located around the outer edge of the liner flange, and the curved ring seat of the fixing part is at least partially embedded in the mounting groove and its edges are pressed by the fiber layer. Through structural superposition, the mechanical strength near the liner flange can be further strengthened, and a foundation is provided for the installation of other components; the buffer layer can prevent damage to the fiber layer when the inner liner substrate expands and contracts. Direct impact is avoided, preventing fiber layer deformation. The spaced installation sections of the annular mounting flange further reduce material consumption. The alternating undulating structure of the spaced installation sections further increases the mechanical strength and stress resistance of the annular mounting flange, making it less prone to deformation and thus more stable, reducing the likelihood of leakage from the non-metallic inner liner. One end of the fastener moves within the mounting hole using the different diameters at both ends, facilitating fastener assembly and easy removal, enhancing operational flexibility. The fixing protrusion of the fixing ring inserts into the gap of the mounting section, guiding assembly and positioning through the fit between the fixing protrusion and the gap, preventing component rotation and displacement during assembly, improving efficiency and saving time and effort. The other end of the fastener passes through the fixing hole on the fixing ring, limiting its position and preventing detachment during assembly, further facilitating assembly and improving efficiency. The support seat is inserted into the positioning protrusion through the positioning hole, with the fiber layer pressing down on the edge of the support seat. This allows for quick and robust installation, providing a foundation for subsequent installation of the inner bracket. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the water heater structure in this application.

[0030] Figure 2 for Figure 1 A schematic diagram of the structure shown in the AA cross section.

[0031] Figure 3 for Figure 1 A schematic diagram of the structure of a medium-sized water heater after opening the front and rear covers of the casing.

[0032] Figure 4 for Figure 3 A schematic diagram of the BB cross-section after the shell has been removed.

[0033] Figure 5 for Figure 4 Enlarged view of section C.

[0034] Figure 6 for Figure 4 Enlarged view of section D in the middle.

[0035] Figure 7 A schematic diagram showing the separation of the water heater shell from the fiber layer.

[0036] Figure 8 for Figure 7 Rear view of the middle side.

[0037] Figure 9 A schematic diagram showing the further disassembly of the water heater after the casing has been removed.

[0038] Figure 10 for Figure 9 Rear view of the middle side.

[0039] Figure 11 for Figure 9 A schematic diagram of the water heater after the casing has been removed, showing its further disassembly.

[0040] Figure 12 for Figure 11 Rear view of the middle side.

[0041] 1 Non-metallic inner liner, 11 Inner liner base, 110 Inner liner port, 111 Inner liner port flange, 1110 Mounting groove, 112 Positioning protrusion, 1120 Positioning groove, 12 Fiber layer, M Inlet pipe, N Outlet pipe, F Flange, L Heating pipe, T Inner cavity, K Reinforcing boss, 2 Annular mounting flange, 21 Fixing part, 211 Reinforcing cylinder, 212 Curved ring seat, 22 Mounting part, X Mounting cavity, 220 Mounting hole, 3 Buffer layer, 4 Fastener, 5 Fixing ring, 50 Fixing hole, 51 Fixing protrusion, P Limiting ring, 6 Support seat, 60 Positioning hole, 7 Inner bracket, 8 Outer bracket, Y Embedded cavity. Detailed Implementation

[0042] The technical solution of this utility model will be further described below with reference to the accompanying drawings: See Figure 1-12As shown, a non-metallic inner tank 1 for a water heater includes an inner tank base 11 and a fiber layer 12. An opening 110 is formed on the inner tank base 11, and the edge of the opening 110 extends outward to form an opening flange 111 protruding from the inner tank base 11. The fiber layer 12 wraps around the outer surface of the inner tank base 11. The outer edge of the cross-section of the opening flange 111 at any position away from the opening 110 does not exceed the outer edge of the cross-section of the opening flange 111 at the opening 110. Specifically, in the radial direction along the opening, the outer edge of the cross-section of the opening flange at any position away from the opening does not exceed the outer edge of the cross-section of the opening flange at the opening. That is, the opening flange protruding from the inner tank base does not form a flanged structure. Therefore, processing the inner tank base is simpler and more convenient, reducing the technological difficulty, simplifying the process steps, and lowering the mold opening difficulty. Moreover, the non-metallic inner liner using this solution not only reduces the cost of the inner liner by about 20%, but also reduces the amount of manual labor during assembly by about 20%. Subsequently, the annular mounting flange can be directly fitted onto the inner liner flange and held in place by the fiber layer, without needing to press the annular mounting flange against the flange's flange edge. Therefore, the process steps do not necessarily need to follow the sequence of assembling the annular mounting flange first and then flange-flanging the inner liner flange, providing greater flexibility in processing operations and creating favorable conditions for improving the coordination efficiency between various processes. Preferably, the inner liner substrate 11 is made of plastic. Preferably, the fiber layer 12 is wrapped around the outer surface of the inner liner substrate 11 in a winding manner.

[0043] See Figure 1-4 As shown in Figures 7-12, the inner liner substrate 11 also has an outwardly extending water inlet pipe M and a water outlet pipe N. In this application, the water inlet pipe and the water outlet pipe extend from the inner liner substrate, thus eliminating the need for separate water inlet pipe and water outlet pipe parts. This reduces the number of parts and facilitates subsequent assembly. Preferably, the water inlet pipe M and the water outlet pipe N are integrally formed on the inner liner substrate 11.

[0044] See Figure 2 , 4 As shown in Figures 6, 9, and 11, the outer wall of the flange 111 is one of the following shapes: cylindrical, conical, waisted, bottle-neck, or domed with an open top. Preferably, the outer wall of the flange 111 is cylindrical, which makes processing more convenient and faster.

[0045] Furthermore, the outer wall surface of the flange 111 also has a raised and recessed structure. In this application, forming a raised and recessed structure on the outer wall surface of the flange can increase the friction between the outer wall surface of the flange and the components in contact with it (such as the subsequently fitted annular mounting flange), improve the stability during installation, prevent component displacement or rotation, facilitate assembly operations, and improve assembly efficiency.

[0046] See Figure 2 , 4As shown in Figures 6, 9, and 11, the inner wall of the flange 111 is open and funnel-shaped. This structural design facilitates the installation of flanges such as those with heating pipes L, resulting in a better seal between the flange 111 and flange F, and also enhances the pressure-bearing capacity of flange F.

[0047] See Figure 2 , 4 As shown in -6 and 11, an installation groove 1110 is also formed around the outer surface of the inner liner base 11 surrounding the liner flange 111.

[0048] See Figure 2 , 4 As shown in Figures 8, 10, and 12, a positioning protrusion 112 is formed on the outer surface of the inner liner base 11 opposite to the position of the liner opening 110, and a positioning groove 1120 is formed around the positioning protrusion 112. Preferably, in this application, an inner cavity T is formed on the inner surface of the inner liner base 11 corresponding to the position of the positioning protrusion 112. The setting of the inner cavity T can further reduce material usage and lower product costs. More preferably, a reinforcing boss K is formed on the inner surface of the inner liner base 11 corresponding to the position of the positioning groove 1120. The setting of the reinforcing boss K can enhance mechanical strength. Moreover, the staggered arrangement of the aforementioned inner cavity T and reinforcing boss K can form an undulating structure on the inner surface of the inner liner base 11, further enhancing structural strength. See Figure 4 , 7 As shown in Figure -12, a non-metallic inner tank assembly structure for a water heater is provided, which adopts the aforementioned non-metallic inner tank for a water heater.

[0049] See Figure 5 , 6 As shown in Figures 9, 11, and 12, the device also includes an annular mounting flange 2 fitted onto the flange 111. The annular mounting flange 2 includes a fixing part 21, which includes a reinforcing cylinder 211. The reinforcing cylinder 211 is fitted around the periphery of the flange 111. In this application, preferably, when the outer wall surface of the flange 111 has a relatively regular shape, the inner wall surface of the reinforcing cylinder 211 is in contact with the outer wall surface of the flange 111. The uneven structure provided on the outer wall surface of the flange 111 can increase the friction between it and the inner wall surface of the reinforcing cylinder 211.

[0050] See Figure 5 , 6As shown in Figures 9, 11, and 12, the fixing part 21 also includes a curved ring seat 212, which is at least partially embedded in the mounting groove 1110, with the fiber layer 12 pressing down on the edge of the curved ring seat 212. In this application, this structural design provides a relatively flat surface for the subsequently wound fiber layer, facilitating a tighter laying of the fiber layer at the interface between the curved ring seat and the outer surface of the inner liner substrate. In this application, the reinforcing sleeve of the annular mounting flange fixing part is located around the outer edge of the liner flange, and the curved ring seat of the annular mounting flange fixing part is at least partially embedded in the mounting groove and its edge is pressed down by the fiber layer. Through the structural superposition of the annular mounting flanges, the mechanical strength near the liner flange can be further strengthened, and the stress resistance performance can be improved. The annular mounting flange also provides a foundation for the installation of other components. Preferably, the longitudinal section of the fixing part is generally "U" shaped.

[0051] See Figure 5 , 6 As shown in Figures 7, 9, 11, and 12, a buffer layer 3 is also included. The buffer layer 3 is located at the intersection of the outer surface of the inner liner substrate 11 and the edge of the curved ring seat 212, with the fiber layer 12 pressing against the buffer layer 3. In this application, to avoid the expansion and contraction of the inner liner substrate during high and low pressure changes within its cavity, which could cause deformation of the fiber layer and reduce the possibility of fiber layer breakage, a buffer layer is laid around the intersection of the outer surface of the inner liner substrate and the edge of the curved ring seat, between the buffer layer and the fiber layer. With this structural design, the stress resistance and overall strength of the non-metallic inner liner are increased by about 30%, and its service life is extended by about 30%.

[0052] See Figure 5 , 9 As shown in Figures 11 and 12, the annular mounting flange 2 also includes mounting portions 22. These mounting portions 22 are spaced apart and protrude from the curved ring seat 212 along the circumferential direction of the reinforcing cylinder 211. Each mounting portion 22 also has a mounting cavity X, with one end of the fastener 4 located within the mounting cavity X. In this application, the spaced mounting portions of the annular mounting flange further reduce material consumption. Furthermore, the alternating undulating structure of the spaced mounting portions further increases the mechanical strength of the annular mounting flange and improves its stress resistance. Therefore, the annular mounting flange is less prone to deformation, resulting in stronger structural stability and reducing the likelihood of leakage from the non-metallic inner liner. Preferably, the mounting portions 22 can be a raised structure with a concave cavity, welded or integrally formed on the upper surface of the curved ring seat 212, or a raised structure formed by stamping on the lower surface of the curved ring seat 212. In this application, preferably, the mounting portions 22 can abut against the outer peripheral wall of the reinforcing cylinder 211, or there can be a certain gap between them.

[0053] See Figure 9 ,11 As shown in Figure 12, the top wall of the mounting cavity X has a mounting hole 220. The diameter of one end of the mounting hole 220 is larger than the diameter of the other end. One end of the fastener 4 is inserted into the mounting cavity X through one end of the mounting hole 220 and is engaged with the other end of the mounting hole 220. Preferably, the mounting hole 220 is a convex hole. In this application, one end of the fastener moves within the mounting hole by utilizing the difference in diameter at both ends of the mounting hole, which facilitates the assembly operation of the fastener and makes it easy to remove the fastener at any time, thus increasing operational flexibility. In some embodiments of this application, one end of the fastener 4 can move within the range defined by the mounting hole 220, or in other embodiments, one end of the fastener 4 is engaged with the mounting hole 220 and cannot move within its defined range; both are within the scope of this application.

[0054] See Figure 2 , 4 As shown in Figures 6 and 9-12, the assembly also includes a retaining ring 5. The inner circumferential wall of the retaining ring 5 abuts against the outer wall of the reinforcing cylinder 211. A retaining protrusion 51 is formed on the side of the retaining ring 5 facing the curved ring seat 212. The retaining protrusion 51 is inserted into the gap between the mounting portions 22. In this application, the inner circumferential wall of the retaining ring abuts against the outer wall of the reinforcing cylinder, and the mechanical strength is further enhanced through structural superposition. Moreover, the retaining protrusion of the retaining ring inserted into the gap of the mounting portion not only plays a guiding role during assembly, but also plays a positioning role through the cooperation between the retaining protrusion and the gap of the mounting portion. This prevents the parts from rotating or shifting during assembly by the worker, improving assembly efficiency and saving time and effort.

[0055] See Figure 9-12 As shown, the fixing ring 5 also has a fixing hole 50, through which the other end of the fastener 4 passes to limit its position. In this application, the other end of the fastener passes through the fixing hole on the fixing ring to limit the fastener, preventing it from coming loose during assembly, facilitating assembly operations, and improving assembly efficiency. In this application, the non-metallic inner liner assembly structure also includes a limiting ring P press-fitted onto the fixing ring 5. The limiting ring P can also limit the position of, for example, the flange F with the heating tube L after it is installed. The limiting ring P has a through hole, through which the other end of the fastener 4 passes for fixation.

[0056] See Figure 2-4As shown in Figures 8-12, the system also includes a support base 6. A positioning hole 60 is provided at the center of the support base 6, and a positioning protrusion 112 is inserted into the positioning hole 60. The support base 6 is at least partially embedded in the positioning groove 1120, and the fiber layer 12 presses against the edge of the support base 6. In this application, the positioning protrusion inserted into the positioning hole serves as a guide during assembly, making assembly faster, the structure more robust, and improving assembly efficiency. The installation of the support base also provides conditions for subsequent installation of internal hangers, etc. In this application, the support base is at least partially embedded in the positioning groove, which can provide a relatively flat surface for the subsequently wound fiber layer, facilitating a tighter laying of the fiber layer at the junction between the edge of the support base and the outer surface of the inner liner substrate. In this application, preferably, to avoid the expansion and contraction of the inner liner substrate 11 due to high and low pressure changes in its cavity, which could cause deformation of the fiber layer 12 and reduce the possibility of fiber layer 12 breakage, a buffer layer 3 can also be laid around the junction between the outer surface of the inner liner substrate 11 and the edge of the support base 6.

[0057] See Figure 3 , 4 As shown in Figures 8-12, the device also includes an inner bracket 7. One end of the inner bracket 7 is mounted on the support base 6, and the other end of the inner bracket 7 is connected to the outer bracket 8. The inner bracket 7 has an overall T-shaped structure. In this application, the support base has a connecting hole, and the inner bracket is mounted on the support base by fasteners installed in the connecting hole. In this application, preferably, to save space inside the water heater casing, the support base 6 is also provided with an embedding groove Y for one end of the inner bracket 7 to be inserted. In this application, preferably, to further improve the mechanical strength of the inner bracket 7 and ensure that the inner bracket 7 makes way for other components, the middle section of the inner bracket 7 is connected with a bending reinforcement structure, and the other end of the inner bracket 7 connected to the bending reinforcement structure is connected to the outer bracket 8. In this application, preferably, the inner bracket 7 is also connected to the casing, and the outer bracket 8 is also connected to the casing. More preferably, the other end of the inner bracket 7 can be directly or indirectly connected to the outer bracket 8.

[0058] See Figure 1-12 As shown, a water heater uses the aforementioned non-metallic inner tank 1 for water heaters.

[0059] See Figure 1-12 As shown, a water heater adopts the above-mentioned non-metallic inner tank assembly structure for water heaters.

[0060] Although the specific embodiments of this utility model have been described above, those skilled in the art can make changes to it without departing from the spirit and principle of this utility model. The scope of protection of this utility model is defined by its claims and their equivalents.

Claims

1. A non-metallic inner tank for a water heater, comprising an inner tank substrate and a fiber layer, wherein the inner tank substrate has an opening, the edge of the opening extends outward to form an opening flange protruding from the inner tank substrate, and the fiber layer wraps around the outer surface of the inner tank substrate, characterized in that: The outer edge of the cross-section of the flange at any position away from the flange does not extend beyond the outer edge of the cross-section of the flange at the flange.

2. The non-metallic inner tank for a water heater according to claim 1, characterized in that: The inner liner substrate also has outwardly extending inlet and outlet pipes.

3. The non-metallic inner tank for a water heater according to claim 1, characterized in that: The outer wall of the flange is one of the following shapes: cylindrical, conical, waisted, bottle-mouth, or dome-shaped with an open top.

4. The non-metallic inner tank for a water heater according to claim 1, characterized in that: The outer wall surface of the flange also has a concave-convex structure.

5. The non-metallic inner tank for a water heater according to claim 1, characterized in that: The inner wall of the flange is open and funnel-shaped.

6. The non-metallic inner tank for a water heater according to claim 1, characterized in that: An installation groove is also formed around the outer surface of the inner liner substrate, surrounding the flange at the liner opening.

7. The non-metallic inner tank for a water heater according to any one of claims 1 to 6, characterized in that: A positioning protrusion is formed on the outer surface of the inner liner substrate opposite to the location of the liner opening, and a positioning groove is formed around the positioning protrusion.

8. A non-metallic inner tank assembly structure for a water heater, characterized in that: The non-metallic inner tank for water heaters as described in any one of claims 1 to 5 is used.

9. A non-metallic inner tank assembly structure for a water heater, characterized in that: The non-metallic inner tank for water heaters as described in claim 6 is used.

10. A non-metallic inner tank assembly structure for a water heater, characterized in that: The non-metallic inner tank for water heaters as described in claim 7 is used.

11. The non-metallic inner tank assembly structure for a water heater according to claim 9, characterized in that: It also includes an annular mounting flange fitted on the inlet flange, the annular mounting flange including a fixing part including a reinforcing cylinder, the reinforcing cylinder being fitted around the inlet flange.

12. The non-metallic inner tank assembly structure for a water heater according to claim 11, characterized in that: The fixing part further includes a curved ring seat, which is at least partially embedded in the mounting groove, and the fiber layer presses against the edge of the curved ring seat.

13. The non-metallic inner tank assembly structure for a water heater according to claim 12, characterized in that: It also includes a buffer layer located at the intersection of the outer surface of the inner liner substrate and the edge of the curved ring seat, with the fiber layer pressing against the buffer layer.

14. The non-metallic inner tank assembly structure for a water heater according to claim 12, characterized in that: The annular mounting flange also includes a mounting portion, which is provided on the curved annular seat at intervals along the circumferential direction of the reinforcing cylinder. The mounting portion also has a mounting cavity, and one end of the fastener is located in the mounting cavity.

15. The non-metallic inner tank assembly structure for a water heater according to claim 14, characterized in that: The top wall of the mounting cavity is provided with a mounting hole. The diameter of one end of the mounting hole is larger than the diameter of the other end of the mounting hole. One end of the fastener is inserted into the mounting cavity through one end of the mounting hole and is locked onto the other end of the mounting hole.

16. The non-metallic inner tank assembly structure for a water heater according to claim 14 or 15, characterized in that: It also includes a retaining ring, the inner peripheral wall of which abuts against the outer wall surface of the reinforcing cylinder, and the retaining ring having a retaining protrusion on the side facing the curved ring seat, the retaining protrusion being inserted into the gap between the mounting parts.

17. The non-metallic inner tank assembly structure for a water heater according to claim 16, characterized in that: The fixing ring is also provided with a fixing hole, and the other end of the fastener passes through the fixing hole to limit the position of the fastener.

18. The non-metallic inner tank assembly structure for a water heater according to claim 10, characterized in that: It also includes a support base, a positioning hole is provided at the center of the support base, the positioning protrusion is inserted into the positioning hole, the support base is at least partially embedded in the positioning groove, and the fiber layer presses against the edge of the support base.

19. The non-metallic inner tank assembly structure for a water heater according to claim 18, characterized in that: It also includes an inner bracket, one end of which is mounted on the support base, and the other end of which is connected to the outer bracket. The inner bracket has an overall T-shaped structure.

20. A water heater, characterized in that: The non-metallic inner tank for water heaters as described in any one of claims 1 to 7 is used.

21. A water heater, characterized in that: The non-metallic inner tank assembly structure for water heaters as described in any one of claims 8 to 19 is adopted.

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