A plastic liner port flange structure, a plastic liner and an electric water heater

Abstract

The flange structure of the plastic liner mouth comprises a plastic liner with a liner mouth, and the circumferential edge of the liner mouth extends outward to form a joint part; and a flange seat is arranged on the outer periphery of the joint part and is attached to the outer wall of the plastic liner, and the longitudinal section of the flange seat is in the shape of a "corpse", a "R" or a "J". The technical scheme provided by the utility model has the following advantages compared with the prior art: the flange structure is not embedded in the plastic liner by injection molding, so it is not easy to be damaged or to leak water, the structure is simple and firm, the processing difficulty is low, the production is easy to be standardized quickly, and the material cost is low.

Description

Technical Field

[0001] This utility model relates to the field of flange structure for inner tank of electric water heater, and particularly to a flange structure for inner tank of plastic, plastic inner tank and electric water heater. Background Technology

[0002] Nowadays, electric water heaters are an indispensable household appliance. As manufacturers continuously raise new requirements for the materials used in electric water heater inner tanks in terms of scale prevention, rust prevention, and cost reduction, new plastic materials are gradually replacing the metal materials covered with enamel coatings. This has led to a series of problems between the plastic inner tank and the flange structure at the tank opening (the original flange structure was connected to the metal inner tank wall by welding, while with a plastic inner tank, the flange structure is generally injection-molded into the flange of the inner tank opening). For example, when the water in the plastic inner tank is heated to a high pressure, it can cause deformation. Because the flange structure is generally injection-molded into the flange, this deformation can cause the flange structure to separate from the plastic inner tank, leading to damage and leakage.

[0003] For example, Chinese utility model patent CN220582768U, entitled "An Injection Molded Crystal Insulator," discloses: an upper and lower insulator welded together, with the upper insulator having an opening opposite to the lower insulator that forms a cap; a flange, injection molded and embedded within the cap, the flange having an inner extending edge on its inner circumferential wall, the inner extending edge being embedded within the cap; and multiple main top holes for mounting bolts on the flange's end face opposite to the interior of the upper insulator. The flange's end facing the interior of the upper insulator has a circumferentially outward extending side, the outer circumferential side of which extends beyond the outer circumferential side of the flange, the inner circumferential side of which is fixedly hooked to the inner extending edge, and the circumferentially outward extending side being embedded within the cap; the outer wall of the upper insulator is covered with a peripheral fiber layer extending to the outer circumferential wall of the flange. The technical solution described in this utility model involves using a conventional injection molding method to fit the inner extension edge of the flange inner circumferential wall and the circumferentially outward extension side that hooks onto the inner liner end cap. Therefore, it is easy for the inner liner to deform, leading to leakage or damage. In addition, the structure in which the inner extension edge of the flange inner circumferential wall hooks onto the circumferentially outward extension side is also very complex, increasing the processing difficulty and hindering the improvement of production efficiency.

[0004] Therefore, there is a need to further develop a flange structure for the inner tank that is not affected by the deformation of the plastic inner tank and is simple and easy to process. For example, Chinese utility model patent with authorization announcement number CN220169661U, entitled "Inner Tank Assembly for Electric Water Heater and Electric Water Heater", discloses: a tank body 1, with an installation part 12 provided on the edge of the inner tank opening 11, the installation part extending outward toward the outer side of the inner tank opening 11, and an outward flange 13 provided on the edge of the free end of the installation part; a first connecting part 14 provided on the outer surface of the tank body; a flange 2, with an annular overlapping part 21 provided on the inner ring of the flange 2, and a second connecting part 22 provided on the flange 2; and a reinforcing layer 3; wherein the flange 2 is fitted onto the installation part, the outward flange 13 overlaps the annular overlapping part 21, the first connecting part 14 is connected to the second connecting part 22, and the reinforcing layer 3 is wrapped around the outside of the inner tank body 1. Correspondingly, the inner circumference of flange 2 is provided with an annular overlap portion 21. Flange 2 is fitted entirely onto the mounting portion, and the outer flange 13 overlaps the outer side of the annular overlap portion 21, so that flange 2 is fixedly installed on the tank body 1. Since flange 2 is installed entirely on the outside of tank body 1, and the outer flange 13 cooperates with flange 2 to achieve a fixed assembly, there are no embedded parts inside the tank body 1 during water filling. That is, there is no connection between flange 2 and tank body 1 inside tank body 1. In this way, when the water inside tank body 1 is heated to form a high pressure, cracks will not occur and leaks will not occur due to the existence of connection parts inside tank body 1, thus improving the reliability of use. In addition, the reinforcing layer 3 outside tank body 1 is usually made by winding fibers. Although the technical solution described in this utility model solves the problem of the flange structure being embedded in the inner tank flange (by overlapping the outer flange 13 of the inner tank with the annular overlap portion 21 of the flange 2 rather than embedding it in the outer flange 13 of the inner tank), it still requires machining the annular overlap portion 21 on the inner ring of the flange 2, which is complex, inefficient, and difficult to produce standard parts quickly. For example, Chinese invention application CN106369828A, entitled "A Flange for Heating Wire of Plastic Inner Tank of Water Heater," discloses a flange comprising a connected cylindrical portion and a conical portion. The cylindrical portion has a cylindrical inner hole that mates with the outer circle of a cylindrical sleeve protruding outward from the end of the spherical end cap of the water heater inner tank. The inner surface of the conical portion contacts the connecting surface of the water heater inner tank. The outer end face of the cylindrical portion has a flange connection hole near its edge, and the flange is connected to the external heating structure through the flange connection hole and bolts. The inner surface is spherical, and the spherical surface mates with the spherical outer surface of the end cap of the water heater's inner tank. The inner curved surface is welded to the spherical outer surface of the water heater's inner tank, and the cylindrical inner hole is welded to the outer circle of the cylindrical sleeve that protrudes outward from the end of the spherical end cap of the water heater's inner tank.The technical solution described in this invention application is, on the one hand, not applicable to a plastic inner liner (the inner curved surface of the conical part is welded to the spherical outer surface of the water heater inner liner, and the cylindrical inner hole of the cylindrical part is welded to the outer circle of the cylindrical sleeve protruding outward from the end of the spherical head of the water heater inner liner. Among them, the welding method is adopted and is applicable to the connection with the plastic inner liner); on the other hand, the overall structure of the flange has a high material cost (there is no groove cavity in the cylindrical part, resulting in a high material cost) and cannot adapt to the repeated deformation of the plastic inner liner. Summary of the Utility Model

[0005] In view of the deficiencies of the prior art, the present utility model provides a flange structure for the mouth of a plastic inner liner, a plastic inner liner, and an electric water heater that are not injection-molded and fitted with the plastic inner liner, are not easily damaged or leaky, have a simple and firm structure, low processing difficulty, are easy to produce rapidly and standardize, and have a low material cost.

[0006] The present utility model mainly adopts the following technical solutions:

[0007] A flange structure for the mouth of a plastic inner liner includes a plastic inner liner with a mouth, a joint part extends outward from the circumferential edge of the mouth, and further includes a flange seat located outside the joint part and fitting with the outer wall of the plastic inner liner. The longitudinal section of the flange seat is in the shape of an inverted "尸", "卩", or "ㄐ".

[0008] Among them, it further includes a fiber layer, and the fiber layer wraps around the outer wall of the plastic inner liner and covers part of the flange seat.

[0009] Among them, through holes are provided on the flange seat, and the through holes are connected to the cavity of the plastic inner liner.

[0010] Among them, sleeves extending outward are further provided at the through holes.

[0011] Among them, the flange seat includes a fixing part, and the fixing part is in the shape of an arc-shaped circular ring and fits with the outer wall of the plastic inner liner near the mouth, or the longitudinal section of the fixing part is in the shape of "几" or "乙" and the fixing part partially fits with the outer wall of the plastic inner liner.

[0012] Among them, the flange seat further includes a connecting part, and the inner peripheral wall and / or the top wall of the connecting part abuts against the joint part. The longitudinal section of the connecting part is in the shape of "ㄇ", "ワ", or "𠃍", or the connecting part is in the shape of an arc-shaped circular ring and fits with the outer wall of the plastic inner liner near the mouth.

[0013] Among them, the fixing part and the connecting part are fixedly connected or integrally formed. When the fixing part and the connecting part are fixedly connected, the inner edge of the bottom end of the inner peripheral wall of the connecting part is connected to the inner peripheral edge of the fixing part.

[0014] The connector also has a mounting hole on its top wall, and a fastener is installed in the mounting hole.

[0015] The joint is trumpet-shaped.

[0016] A plastic inner liner, employing the flange structure of the aforementioned plastic inner liner.

[0017] An electric water heater adopts the above-mentioned flange structure for the inner plastic tank.

[0018] According to the technical solution described in this utility model, the following beneficial effects are achieved: the flange seat is located on the outer periphery of the joint and fits against the outer wall of the plastic inner liner, avoiding injection molding and embedding with the plastic inner liner, thus preventing deformation of the plastic inner liner under high temperature and pressure, which could lead to damage or leakage; the longitudinal section of the flange seat indicates its simple structure, eliminating the need for complex "extended edges" or "bent edges," which helps reduce production difficulty, improve production efficiency, and facilitates the production of standard flange seats; the fiber layer wrapping the plastic inner liner improves its compressive strength and, on the other hand, [further benefits are provided]. After covering part of the flange seat, it also serves to fix the flange seat, and provides elastic space for loosening between the plastic inner liner and the flange seat; the sleeve at the through hole of the flange seat facilitates the subsequent assembly of the water inlet pipe and the water outlet pipe, making the structure more integrated; when the fastener and the connector are fixedly connected, the bottom inner edge of the inner peripheral wall of the connector is connected to the inner peripheral edge of the fastener. This structural design allows the inner peripheral wall of the connector to abut against the joint, preventing the connection gap between the inner peripheral wall of the connector and the inner peripheral edge of the fastener from being exposed, so as to avoid material spreading into the gap during the injection molding of the plastic inner liner. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of an electric water heater.

[0020] Figure 2 A schematic diagram of a plastic inner liner structure that is covered with a fiber layer and fitted with flange seats, etc.

[0021] Figure 3 for Figure 2 The cross-sectional structure shown in AA is a schematic diagram.

[0022] Figure 4 for Figure 3 A schematic diagram of the structure after the plastic inner liner has been removed.

[0023] Figure 5 for Figure 2 A schematic diagram of the partial decomposition structure.

[0024] Figure 6 This is a schematic diagram of the side structure of the flange seat with sleeve and fasteners.

[0025] Figure 7 As Figure 6 shown in an embodiment of [the figure], it is a schematic structural diagram of the B-B cross-section structure.

[0026] Figure 8 As Figure 7 the enlarged view of part C in [the figure].

[0027] Figure 9 As Figure 6 shown in another embodiment of [the figure], it is a schematic structural diagram of the B-B cross-section structure.

[0028] Figure 10 As Figure 9 the enlarged view of part D in [the figure].

[0029] Figure 11 As Figure 6 shown in another embodiment of the back side structure of the flange seat in [the figure].

[0030] 1 Plastic inner container, 10 Inner container opening, 11 Joint part, 2 Flange seat, 20 Through hole, 21 Fixing part, 22 Connecting part, 3 Fiber layer, 4 Sleeve, 5 Fastening part. Specific embodiments

[0031] The following further elaborates on the technical solution of the present utility model in conjunction with the accompanying drawings:

[0032] Referring to Figure 1-11 as shown, a flange structure for the inner container opening of a plastic inner container includes a plastic inner container 1 provided with an inner container opening 10, the circumferential edge of the inner container opening 10 extends outward to form a joint part 11, and further includes a flange seat 2 located on the outer periphery of the joint part 11 and fitting on the outer wall of the plastic inner container. The longitudinal section of the flange seat 2 is in the shape of an inverted "尸", "卩" or "ㄐ". In this application, "outward" in "the circumferential edge of the inner container opening extends outward" refers to the direction away from the cavity of the plastic inner container. In this application, the flange seat is located on the outer periphery of the joint part and fits on the outer wall of the plastic inner container, avoiding being injection-molded and embedded with the plastic inner container together, thereby preventing the plastic inner container from deforming under high temperature and high pressure and causing damage or water leakage of the inner container. In this application, the shape presented by the longitudinal section of the flange seat indicates that its structure is simple, without the need to process complex "extended edges", "bent edges" and other structures on the inner peripheral side of the flange seat, which is beneficial to reducing the production difficulty, improving the production efficiency, and facilitating the standardized production of the flange seat.

[0033] Referring to Figure 2-5As shown, it also includes a fiber layer 3, which wraps around the outer wall of the plastic inner liner and covers part of the flange seat. In this application, wrapping the plastic inner liner with a fiber layer can improve the pressure resistance of the plastic inner liner, and the fiber layer also helps to fix the flange seat after covering part of it. In this application, the fiber layer fixes the flange seat to the plastic inner liner, avoiding injection molding and embedding together. Moreover, even if the plastic inner liner deforms, it can provide elastic space for loosening between the plastic inner liner and the flange seat. Preferably, a recess is formed on the plastic inner liner 1 for the flange seat to be inserted, so as to prevent a large position between the flange seat and the plastic inner liner that would make it difficult to wrap the fiber layer.

[0034] See Figure 3-11 As shown, a through hole 20 is provided on the flange seat 2, which is connected to the cavity of the plastic inner liner 1. This application also includes an inlet pipe, an outlet pipe, or other components or fittings that need to extend into the cavity of the plastic inner liner through the through hole, which are connected to the cavity of the plastic inner liner. The inlet pipe, outlet pipe, and other components or fittings can each extend into the cavity of the plastic inner liner through the through hole. To ensure the sealing performance of the cavity of the plastic inner liner, a probe extending from the through hole can also be formed on the plastic inner liner during the injection molding process. Please note that the setting of the probe in this application is not an obstacle to the connection between the through hole and the cavity of the plastic inner liner.

[0035] See Figure 2-11 As shown, an outwardly extending sleeve 4 is also provided at the through hole 20. In this application, the sleeve at the through hole of the flange seat facilitates the subsequent assembly of the inlet and outlet pipes, making the flange seat structure more integrated. In this application, "outwardly" in "an outwardly extending sleeve is also provided at the through hole" refers to a direction opposite to the cavity of the plastic inner liner.

[0036] See Figure 6-11 As shown, the flange seat 2 includes a fastener 21, which is an arc-shaped ring that fits against the outer wall of the plastic inner liner 1 near the inlet 10. Alternatively, the longitudinal section of the fastener 21 is shaped like a "U" or a "Z" and the fastener 21 is partially fitted against the outer wall of the plastic inner liner 1. Preferably, the fiber layer 3 wraps around the outer wall of the plastic inner liner and covers part of the fastener 21.

[0037] See Figure 6-11As shown, the flange seat 2 also includes a connector 22, the inner peripheral wall and / or top wall of which abut against the joint 11. The longitudinal section of the connector 22 is U-shaped, WA-shaped, or 𠃍-shaped, or the connector 22 is an arc-shaped ring that fits against the outer wall of the plastic inner liner 1 near the liner opening 10. In this application, using a connector with a longitudinal section of U-shaped, WA-shaped, or 𠃍-shaped can save material costs, and the bending shape of the connector further improves the stability and mechanical strength of the connector. In one embodiment of this application, preferably, the through hole only passes through the fixing member and communicates with the cavity of the plastic inner liner through the through hole on the plastic inner liner. In another embodiment of this application, preferably, the through hole passes through the connector and the fixing member respectively and communicates with the cavity of the plastic inner liner through the through hole on the plastic inner liner. Correspondingly, the sleeve extending outward at the through hole can also be: extending outward only from the fixing member, passing through the cavity of the plastic inner liner and extending outward; or it can be: extending outward only from the outer periphery of the connector, extending outward from any point in the depth of the through hole between the fixing member and the connector, extending through the cavity of the plastic inner liner, passing through the fixing member and the connector, and continuing to extend outward. Here, "outer periphery" and "outward" both refer to directions opposite to the cavity of the plastic inner liner. Preferably, the fiber layer covers part of the fixing member and extends until it reaches the outer peripheral wall of the connector.

[0038] See Figure 6-11 As shown, the fastener 21 and the connector 22 are fixedly connected or integrally formed. When the fastener 21 and the connector 22 are fixedly connected, the inner edge of the bottom end of the inner peripheral wall of the connector 22 is connected to the inner peripheral edge of the fastener 21. Preferably, the fastener 21 and the connector 22 are fixedly connected by welding. More preferably, the inner edge of the bottom end of the inner peripheral wall of the connector 22 is connected to the inner peripheral edge of the fastener 21. This connection method avoids exposing the weld seam near the joint, that is, avoids the weld seam facing the joint, thereby preventing the material at the joint from intruding into the space defined between the connector and the fastener from the gap between the bottom end of the inner peripheral wall of the connector and the upper wall surface of the fastener near the inner peripheral edge during injection molding.

[0039] See Figure 2-10 As shown, a mounting hole is also provided on the top wall of the connector 22, and a fastener 5 is installed in the mounting hole. Preferably, the fastener 5 is a screw, with the screw shank extending out of the mounting hole from the space defined by the connector 22 and the fixing member 21, and the screw nut being locked within the space defined by the connector 22 and the fixing member 21.

[0040] See Figure 2-5As shown, the joint 11 is trumpet-shaped. In this application, the joint abuts against the inner peripheral wall and / or top wall of the connector, including but not limited to, the joint abuts against the inner peripheral wall, top wall, inner peripheral wall and top wall of the connector respectively when the longitudinal section of the flange seat has different shapes.

[0041] See Figure 2-5 As shown, a plastic inner liner adopts the flange structure of the aforementioned plastic inner liner.

[0042] See Figure 1 As shown, an electric water heater adopts the above-mentioned plastic inner tank flange structure.

[0043] 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 flange structure for a plastic inner liner, comprising a plastic inner liner with an opening, wherein the circumferential edge of the opening extends outward to form a joint, characterized in that: It further includes a flange base located on the outer periphery of the joint and fitting against the outer wall of the plastic inner container, and the longitudinal section of the flange base is in an inverted "尸" shape, "卩" shape or "ㄐ" shape.

2. The flange structure of the plastic inner liner according to claim 1, characterized in that: It further includes a fiber layer, and the fiber layer wraps around the outer wall of the plastic inner container and covers part of the flange base.

3. The flange structure of the plastic inner liner according to claim 1, characterized in that: A through hole is provided on the flange base, and the through hole is communicated with the cavity of the plastic inner container.

4. The flange structure of the plastic inner liner according to claim 3, characterized in that: A sleeve extending outward is further provided at the through hole.

5. The flange structure of the plastic inner liner according to any one of claims 1 to 4, characterized in that: The flange base includes a fixing member, and the fixing member is in an arc-shaped circular ring shape and fits against the outer wall of the plastic inner container near the mouth of the container, or the longitudinal section of the fixing member is in a "几" shape or "乙" shape and the fixing member partially fits against the outer wall of the plastic inner container.

6. The flange structure of the plastic inner liner according to claim 5, characterized in that: The flange base further includes a connecting member, and the inner peripheral wall and / or the top wall of the connecting member abuts against the joint, and the longitudinal section of the connecting member is in a "ㄇ" shape, "ワ" shape or "𠃍" shape, or the connecting member is in an arc-shaped circular ring shape and fits against the outer wall of the plastic inner container near the mouth of the container.

7. The flange structure of the plastic inner liner according to claim 6, characterized in that: The fixing member and the connecting member are fixedly connected or integrally formed. When the fixing member and the connecting member are fixedly connected, the bottom inner edge of the inner peripheral wall of the connecting member is connected to the inner peripheral edge of the fixing member.

8. The flange structure of the plastic inner liner according to claim 6, characterized in that: An installation hole is further provided on the top wall of the connecting member, and a fastener is installed in the installation hole.

9. The flange structure of the plastic inner liner according to any one of claims 1 to 4, 6 to 8, characterized in that: The joint is in a flared shape.

10. A plastic inner liner, characterized in that: Adopt the mouth flange structure of the plastic inner container according to any one of claims 1 to 9.

11. An electric water heater, characterized in that: Adopt the mouth flange structure of the plastic inner container according to any one of claims 1 to 9.

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