An electric water heater

Abstract

The application discloses an electric water heater and belongs to the technical field of household appliances. The electric water heater comprises a shell, an inner container interlayer, a back plate and a drainage groove cover, a heat preservation layer cavity is formed between the inner container interlayer and the shell, the back plate is arranged at a mounting port of the shell, the back plate is provided with a pouring port, foaming material is poured into the heat preservation layer cavity through the pouring port, the drainage groove cover is buckled at the pouring port and located in the heat preservation layer cavity, the drainage groove cover comprises a blocking plate which is arranged opposite to the pouring port to change the flow direction of the foaming material and a shunt plate which is located at the side of the pouring port, a plurality of overflow holes which allow the foaming material to enter the heat preservation layer cavity are arranged on the shunt plate, and the foaming material entering the heat preservation layer cavity can be foamed to form a polyurethane heat preservation layer. The electric water heater is provided with the drainage groove cover at the pouring port, the foaming material can be effectively dispersed, the polyurethane heat preservation layer formed has good wrapping on the inner container interlayer, and thus the heat preservation performance of the electric water heater is improved.

Description

Technical Field

[0001] This invention relates to the field of household appliance technology, and more particularly to an electric water heater. Background Technology

[0002] Electric water heaters typically have an insulation layer to improve their heat retention performance and avoid energy waste caused by repeated heating. Polyurethane is commonly used as the insulation layer, and it is mostly formed using a single-stage foaming process. However, in existing electric water heaters, the polyurethane insulation layer is often injected in a concentrated manner during foaming, which easily leads to insufficient mixing of the foaming material and unidirectional expansion. This results in uneven foam density, low closed-cell rate, and consequently, poor heat retention performance of the polyurethane insulation layer.

[0003] Therefore, how to develop an electric water heater that can overcome the above-mentioned defects is a technical problem that urgently needs to be solved. Summary of the Invention

[0004] The purpose of this invention is to provide an electric water heater with a polyurethane insulation layer having uniform foam density and high closed-cell rate, resulting in good heat preservation performance.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] An electric water heater includes: an outer shell and an inner tank sandwiched inside the outer shell, the inner tank sandwiched inside the outer shell forming a heat insulation cavity between the inner tank sandwiched inside the outer shell and the outer shell, the outer shell having an installation port; a back plate disposed at the installation port, the back plate having an injection port communicating with the heat insulation cavity and used to inject foaming material into the heat insulation cavity; and a flow channel cover fastened to the injection port and located inside the heat insulation cavity, the flow channel cover including a baffle plate disposed opposite to the injection port to change the flow direction of the foaming material and a flow divider plate located to the side of the injection port, the flow divider plate having a plurality of overflow holes allowing the foaming material to enter the heat insulation cavity, the foaming material entering the heat insulation cavity being able to foam to form a polyurethane heat insulation layer.

[0007] Preferably, the diversion channel cover is U-shaped, and the diversion plate includes a first diversion plate and a second diversion plate connected to both sides of the baffle plate. Both the first diversion plate and the second diversion plate are provided with a plurality of overflow holes.

[0008] Preferably, a first retaining plate is provided on the outer side of the first diverter plate, and a first positioning groove is formed between the first diverter plate and the first retaining plate; a second retaining plate is provided on the outer side of the second diverter plate, and a second positioning groove is formed between the second diverter plate and the second retaining plate; a first positioning rail and a second positioning rail are provided on the back plate, and the first positioning rail and the second positioning rail are provided on both sides of the injection port, the first positioning rail can be engaged in the first positioning groove, and the second positioning rail can be engaged in the second positioning groove.

[0009] Preferably, one of the first card plate and the first positioning rail is provided with a first positioning hole, and the other is provided with a first positioning guide post, the first positioning guide post being able to be inserted into the first positioning hole; and / or one of the second card plate and the second positioning rail is provided with a second positioning hole, and the other is provided with a second positioning guide post, the second positioning guide post being able to be inserted into the second positioning hole.

[0010] Preferably, the first positioning hole is disposed on the first card plate, and the lengths of the first card plate on both sides of the first positioning hole are different. The first positioning guide post is disposed on the first positioning rail, and the lengths of the first positioning rail on both sides of the first positioning guide post are different.

[0011] Preferably, the second positioning hole is disposed on the second card plate, and the lengths of the second card plate on both sides of the second positioning hole are different. The second positioning guide post is disposed on the second positioning rail, and the lengths of the second positioning rail on both sides of the second positioning guide post are different.

[0012] Preferably, the first card plate and the second card plate are arranged in parallel; the angle between the line connecting the first positioning hole and the second positioning hole and the length direction of the first card plate is an acute angle.

[0013] Preferably, the first diverter plate has a first claw at its end and a first slot on the back plate, and the first claw engages with the first slot; the second diverter plate has a second claw at its end and a second slot on the back plate, and the second claw engages with the second slot.

[0014] Preferably, there are two first claws, which are respectively disposed at both ends of the first diverter plate; there are two first slots, and the two first claws are engaged in the two first slots in a one-to-one correspondence; there are two second claws, which are respectively disposed at both ends of the second diverter plate; there are two second slots, and the two second claws are engaged in the two second slots in a one-to-one correspondence.

[0015] Preferably, the baffle plate is an arc-shaped plate, and the middle part of the arc-shaped plate protrudes to the side opposite to the back plate.

[0016] The beneficial effects of this invention are:

[0017] This invention provides an electric water heater comprising an outer shell, an inner tank interlayer, a back plate, and a drain channel cover. The inner tank interlayer is located inside the outer shell, forming an insulation cavity between the inner tank interlayer and the outer shell. The outer shell has an installation port, and the back plate is located at the installation port. The back plate has an injection port that communicates with the insulation cavity and is used to inject foaming material into the insulation cavity. The drain channel cover is fastened to the injection port and located inside the insulation cavity. The drain channel cover includes a baffle plate positioned opposite the injection port to change the flow direction of the foaming material and a diversion plate located to the side of the injection port. The diversion plate has multiple overflow holes that allow the foaming material to enter the insulation cavity. The foaming material entering the insulation cavity can foam to form a polyurethane insulation layer. This electric water heater, by setting a diversion groove cover at the filling port, can effectively disperse the foaming material during filling, allowing the foaming material to undergo multi-point reaction when foaming in the insulation layer cavity. This greatly improves the foam density and closed-cell rate after foaming, so that the formed polyurethane insulation layer has better adhesion to the inner tank interlayer, thereby improving the insulation performance of the electric water heater. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the back panel of the electric water heater provided in an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of the drain channel cover of the electric water heater provided in an embodiment of the present invention at a certain angle;

[0020] Figure 3 This is a schematic diagram of the structure of the drain channel cover of the electric water heater provided in an embodiment of the present invention from another angle.

[0021] In the picture:

[0022] 1. Back plate; 101. Injection port; 102. First positioning rail; 103. Second positioning rail; 104. First positioning guide post; 105. Second positioning guide post; 106. First slot; 107. Second slot;

[0023] 2. Drainage channel cover; 201. Baffle plate; 202. First diversion plate; 203. Second diversion plate; 204. Overflow hole; 205. First clamping plate; 206. Second clamping plate; 207. First positioning hole; 208. Second positioning hole; 209. First clamping claw; 210. Second clamping claw. Detailed Implementation

[0024] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0027] This embodiment provides an electric water heater, such as... Figures 1 to 3 As shown, the electric water heater includes an outer shell (not shown), an inner tank (not shown), a back plate 1, and a drain channel cover 2. The inner tank is located inside the outer shell, forming an insulation cavity between the inner tank and the outer shell. In this embodiment, the insulation cavity is an annular chamber used to house the insulation structure, thereby effectively improving the insulation performance of the inner tank. The outer shell has a mounting opening that communicates with the insulation cavity. Optionally, the mounting opening can be circular, square, or oblong; in this embodiment, it is oblong. The back plate 1 is located at the mounting opening and can be fixed to the outer shell by snap-fit ​​or screw connection.

[0028] The shape of the back plate 1 is adapted to the shape of the mounting opening. In this embodiment, the back plate 1 is an oblong plate. An injection port 101 is provided on the back plate 1, which communicates with the insulation layer cavity. Foaming material can be injected into the insulation layer cavity through the injection port 101. After one foaming process within the insulation layer cavity, the foaming material forms a polyurethane insulation layer. In this embodiment, the foaming material is polyurethane foaming material. Of course, in other embodiments, other foaming materials can be used as needed, and the specific type of foaming material is not limited here. Optionally, the injection port 101 can be a round hole, a square hole, or an oblong hole. In this embodiment, a round hole is selected. Further optionally, to facilitate injection, an injection pipe is connected to the injection port 101. The injection pipe can be a round pipe or a funnel-shaped pipe. The funnel-shaped pipe has a larger opening, making it less likely for the foaming material to overflow during the injection process.

[0029] The flow channel cover 2 is fastened to the injection port 101 and located inside the insulation layer cavity, allowing the foaming material entering from the injection port 101 to reach the flow channel cover 2. The flow channel cover 2 includes a baffle plate 201 directly opposite the injection port 101 and a diversion plate located to the side of the injection port 101. The foaming material entering the flow channel cover 2 first flows directly to the baffle plate 201, which changes the flow direction of the foaming material, causing it to flow to the diversion plate. The diversion plate is provided with multiple overflow holes 204. The foaming material flowing to the diversion plate is diverted by the multiple overflow holes 204 and enters the insulation layer cavity through the overflow holes 204. The foaming material entering the insulation layer cavity forms a polyurethane insulation layer after one foaming process.

[0030] This electric water heater features a flow channel cover 2 at the inlet 101. This cover disperses the foaming material during injection, allowing it to react at multiple points within the insulation layer cavity. This significantly increases the foam density and closed-cell rate after foaming, resulting in a polyurethane insulation layer with uniform foam density and fine pores. This, in turn, ensures better adhesion of the polyurethane insulation layer to the inner tank layer, thus improving the water heater's insulation performance.

[0031] Optionally, in this embodiment, the diversion channel cover 2 is U-shaped, and the diversion plate includes a first diversion plate 202 and a second diversion plate 203 connected to both sides of the baffle plate 201. Both the first diversion plate 202 and the second diversion plate 203 are provided with multiple overflow holes 204. This arrangement allows the diversion channel cover 2 to fully divert and disperse the foaming material, thereby further improving the heat preservation performance of the electric water heater.

[0032] Optionally, the baffle plate 201 is an arc-shaped plate, with its center protruding away from the back plate 1. By setting the baffle plate 201 as an arc-shaped plate, it has an arc-shaped blocking surface, allowing the foaming material blocked by the baffle plate 201 to flow smoothly to the first diverter plate 202 and the second diverter plate 203, preventing wall adhesion. Optionally, both the first diverter plate 202 and the second diverter plate 203 are straight plates, which can be vertically arranged or inclined to the vertical direction. The overflow holes 204 on the first diverter plate 202 and the second diverter plate 203 can be round holes, square holes, or oblong holes. In this embodiment, round holes are chosen. Multiple round holes can be arranged regularly or irregularly on the first diverter plate 202 and the second diverter plate 203. The number and arrangement are not limited here and can be flexibly set according to requirements.

[0033] Furthermore, in order to achieve relative fixation between the drainage channel cover 2 and the back plate 1, continue to refer to... Figure 2 and Figure 3 As shown, a first retaining plate 205 is provided on the outer side of the first diverter plate 202, and a first positioning groove is formed between the first diverter plate 202 and the first retaining plate 205. A second retaining plate 206 is provided on the outer side of the second diverter plate 203, and a second positioning groove is formed between the second diverter plate 203 and the second retaining plate 206. (Continuing to refer to...) Figure 1 As shown, a first positioning rail 102 and a second positioning rail 103 are provided on the back plate 1. The first positioning rail 102 and the second positioning rail 103 are located on both sides of the inlet 101. The first positioning rail 102 can be engaged into the first positioning groove, and the second positioning rail 103 can be engaged into the second positioning groove. By utilizing the engagement of the positioning rails and positioning grooves, the flow channel cover 2 and the back plate 1 can be quickly connected. The connection method is simple, the connection is stable, and it is easy to assemble and disassemble.

[0034] Of course, in other embodiments, two first limiting plates can be provided on the back plate 1, thereby forming a first limiting groove between the two first limiting plates, and the end of the first diverting plate 202 can be inserted into the first limiting groove; similarly, two second limiting plates can be provided on the back plate 1, thereby forming a second limiting groove between the two second limiting plates, and the end of the second diverting plate 203 can be inserted into the second limiting groove. In this way, the relative fixation of the diversion channel cover 2 and the back plate 1 can also be achieved.

[0035] Continue to refer to Figures 1 to 3As shown, to achieve positioning between the drainage channel cover 2 and the back plate 1, a first positioning hole 207 is provided on the first clamping plate 205, and a first positioning guide post 104 is provided on the first positioning rail 102. The first positioning guide post 104 can be inserted into the first positioning hole 207. The cooperation between the first positioning guide post 104 and the first positioning hole 207 can achieve one-time positioning of the drainage channel cover 2 and the back plate 1, thereby improving the connection accuracy between the drainage channel cover 2 and the back plate 1. Optionally, the first positioning guide post 104 can be a stepped post, and the stepped surface of the stepped post can support the drainage channel cover 2 to a preset height.

[0036] Alternatively, the first positioning hole 207 and the first positioning guide post 104 are not centrally located, meaning that the lengths of the first clamping plates 205 on both sides of the first positioning hole 207 are different, and the lengths of the first positioning rails 102 on both sides of the first positioning guide post 104 are different. This non-centralized arrangement of the first positioning hole 207 and the first positioning guide post 104 has a foolproof effect, effectively preventing incorrect assembly direction of the drainage channel cover 2 and the back plate 1.

[0037] Of course, the electric water heater can also have a second positioning hole 208 on the second mounting plate 206 and a second positioning guide post 105 on the second positioning rail 103, the second positioning guide post 105 being able to be inserted into the second positioning hole 208. The cooperation of the second positioning guide post 105 and the second positioning hole 208 can achieve secondary positioning of the drainage channel cover 2 and the back plate 1, thereby helping to further improve the positioning accuracy of the drainage channel cover 2 and the back plate 1. Optionally, the second positioning guide post 105 can be a stepped post, the stepped surface of the stepped post being able to support the drainage channel cover 2 to a preset height.

[0038] Furthermore, the cooperation of the two sets of positioning holes and positioning guide posts can also achieve a foolproof effect, so as to avoid incorrect assembly direction of the drainage channel cover 2 and the back plate 1. In some specific embodiments, only the first positioning hole 207 and the first positioning guide post 104 can be provided, or only the second positioning guide post 105 and the second positioning hole 208 can be provided; of course, in some other specific embodiments, the first positioning hole 207 and the first positioning guide post 104, as well as the second positioning guide post 105 and the second positioning hole 208 can be provided simultaneously.

[0039] Furthermore, the second positioning hole 208 and the second positioning guide post 105 can also be non-centered, that is, the lengths of the second clamping plates 206 on both sides of the second positioning hole 208 are different, and the lengths of the second positioning rails 103 on both sides of the second positioning guide post 105 are different. The non-centered setting of the second positioning hole 208 and the second positioning guide post 105 also has a foolproof effect, which can effectively prevent the assembly direction of the drainage channel cover 2 and the back plate 1 from being incorrect.

[0040] Furthermore, the first clamping plate 205 and the second clamping plate 206 are arranged in parallel. That is, the length direction of the first clamping plate 205 and the length direction of the second clamping plate 206 are in the same direction. The angle between the line connecting the first positioning hole 207 and the second positioning hole 208 and the length direction of the first clamping plate 205 is an acute angle. That is, the first positioning hole 207 and the second positioning hole 208 are not directly opposite each other. This arrangement also has a foolproof effect, which can effectively prevent incorrect assembly direction of the drainage channel cover 2 and the back plate 1. Of course, as shown in Figure 1, the angle between the line connecting the first positioning hole 207 and the second positioning hole 208 and the length direction of the first clamping plate 205 can also be a right angle. That is, the first positioning hole 207 and the second positioning hole 208 are directly opposite each other, which can reduce manufacturing difficulty.

[0041] Furthermore, continue to refer to Figures 1 to 3 As shown, to achieve a fixed connection between the diversion channel cover 2 and the back plate 1, a first claw 209 is provided at the end of the first diversion plate 202, and a first slot 106 is provided on the back plate 1, with the first claw 209 engaging with the first slot 106. Similarly, a second claw 210 is provided at the end of the second diversion plate 203, and a second slot 107 is provided on the back plate 1, with the second claw 210 engaging with the second slot 107. This snap-fit ​​connection method not only provides high connection strength but also facilitates assembly and disassembly.

[0042] Optionally, there are two first claws 209, each located at one end of the first diverter plate 202. There are also two first slots 106, with the two first claws 209 correspondingly engaged within each slot. Similarly, there are two second claws 210, each located at one end of the second diverter plate 203. There are also two second slots 107, with the two second claws 210 correspondingly engaged within each slot. This arrangement further enhances the bonding strength between the diversion channel cover 2 and the back plate 1. Further, optionally, the two first slots 106 and two second slots 107 are arranged in a rectangular pattern, as are the two first claws 209 and two second claws 210.

[0043] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An electric water heater, characterised in that, The electric water heater comprises: an outer shell and an inner shell interlayer, the inner shell interlayer is arranged inside the outer shell, and a thermal insulation layer cavity is formed between the inner shell interlayer and the outer shell, and the outer shell is provided with a mounting port; a back plate (1) arranged at the mounting port, the back plate (1) is provided with a pouring port (101), the pouring port (101) is communicated with the thermal insulation layer cavity, and the pouring port (101) is used for injecting foaming material into the thermal insulation layer cavity; a drainage groove cover (2) buckled at the pouring port (101) and located in the thermal insulation layer cavity, the drainage groove cover (2) comprises a blocking plate (201) arranged opposite to the pouring port (101) to change the flow direction of the foaming material and a flow distribution plate located on the side of the pouring port (101), a plurality of overflow holes (204) allowing the foaming material to enter the thermal insulation layer cavity are arranged on the flow distribution plate, and the foaming material entering the thermal insulation layer cavity can be foamed to form a polyurethane thermal insulation layer; the blocking plate (201) is an arc-shaped plate, the middle part of the arc-shaped plate protrudes to the side away from the back plate (1); the drainage groove cover (2) is in a U shape, and the flow distribution plate comprises a first flow distribution plate (202) and a second flow distribution plate (203) connected on both sides of the blocking plate (201).

2. The electric water heater according to claim 1, characterized in that: a plurality of overflow holes (204) are arranged on the first flow distribution plate (202) and the second flow distribution plate (203).

3. The electric water heater according to claim 2, characterized in that: a first clamping plate (205) is arranged on the outer side of the first flow distribution plate (202), a first positioning groove is formed between the first flow distribution plate (202) and the first clamping plate (205), a second clamping plate (206) is arranged on the outer side of the second flow distribution plate (203), and a second positioning groove is formed between the second flow distribution plate (203) and the second clamping plate (206); a first positioning rail (102) and a second positioning rail (103) are arranged on the back plate (1), the first positioning rail (102) and the second positioning rail (103) are arranged on both sides of the pouring port (101), the first positioning rail (102) can be clamped into the first positioning groove, and the second positioning rail (103) can be clamped into the second positioning groove.

4. The electric water heater according to claim 3, characterized in that: one of the first clamping plate (205) and the first positioning rail (102) is provided with a first positioning hole (207), and the other is provided with a first positioning guide column (104), and the first positioning guide column (104) can be inserted into the first positioning hole (207); and / or one of the second clamping plate (206) and the second positioning rail (103) is provided with a second positioning hole (208), and the other is provided with a second positioning guide column (105), and the second positioning guide column (105) can be inserted into the second positioning hole (208).

5. The electric water heater according to claim 4, characterized in that: The first positioning hole (207) is arranged on the first clamping plate (205), the length of the first clamping plate (205) on both sides of the first positioning hole (207) is different, the first positioning guide column (104) is arranged on the first positioning rail (102), and the length of the first positioning rail (102) on both sides of the first positioning guide column (104) is different.

6. The electric water heater according to claim 4, characterized in that, The second positioning hole (208) is arranged on the second clamping plate (206), the length of the second clamping plate (206) on both sides of the second positioning hole (208) is different, the second positioning guide column (105) is arranged on the second positioning rail (103), and the length of the second positioning rail (103) on both sides of the second positioning guide column (105) is different.

7. The electric water heater according to claim 5, characterized in that, The first clamping plate (205) and the second clamping plate (206) are arranged in parallel; The included angle between the line connecting the first positioning hole (207) and the second positioning hole (208) and the length direction of the first clamping plate (205) is an acute angle.

8. The electric water heater according to claim 2, characterized in that, The end of the first shunt plate (202) is provided with a first clamping jaw (209), the back plate (1) is provided with a first clamping groove (106), and the first clamping jaw (209) is clamped with the first clamping groove (106); The end of the second shunt plate (203) is provided with a second clamping jaw (210), the back plate (1) is provided with a second clamping groove (107), and the second clamping jaw (210) is clamped with the second clamping groove (107).

9. The electric water heater according to claim 8, characterized in that, The number of the first clamping jaw (209) is two, the two first clamping jaws (209) are arranged at the two ends of the first shunt plate (202) respectively, the number of the first clamping groove (106) is two, and the two first clamping jaws (209) are clamped in the two first clamping grooves (106) one by one in a corresponding manner; The number of the second clamping jaw (210) is two, the two second clamping jaws (210) are arranged at the two ends of the second shunt plate (203) respectively, the number of the second clamping groove (107) is two, and the two second clamping jaws (210) are clamped in the two second clamping grooves (107) one by one in a corresponding manner.

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