A water storage type electric water heater

Abstract

A water storage type electric water heater comprises an inner container, a heating tube, a water inlet pipe assembly and a water outlet pipe assembly, the inner container is provided with a mounting port, the mounting port is provided with a flange plate, the flange plate is formed with a recess structure facing the mounting port direction, the heating tube is inserted and mounted on the flange plate and extends into the inner container cavity through the mounting port, the water inlet pipe assembly and the water outlet pipe assembly are also inserted and mounted on the flange plate, the water inlet pipe assembly comprises a water inlet pipe and a slow flow sleeve, the slow flow sleeve is provided with a slow flow hole, and the slow flow sleeve is at least partially sleeved on the water inlet pipe so that the water inlet pipe injects water into the inner container cavity through the slow flow hole. The technical scheme provided by the present application has the following advantages compared with the prior art: fewer components, uniform cold water inlet and no disturbance to the hot water layer, high hot water utilization rate and strong hot water endurance, reasonable and ingenious structure design, and convenient and simple installation operation.

Description

Technical Field

[0001] This invention relates to a storage-type electric water heater. Background Technology

[0002] Currently, most storage-type electric water heaters on the market use enamel-lined tanks. These tanks are generally made of welded carbon steel plates, with an enamel glaze applied to the inner surface. After high-temperature firing, the enamel glaze forms an enamel layer on the inner surface. Because space needs to be reserved for the installation of other components, the entire tank has many welds, making it prone to defects such as poor welding, uneven or missing enamel glaze coating at the welds. This leads to rapid corrosion and leakage, further accelerating the wear and tear of the tank. Once the tank is damaged, it is not only difficult to repair but also poses a safety hazard. Furthermore, with continuous technological advancements, new materials and processes are being applied to storage-type electric water heaters. For example, plastic tanks, due to their strong corrosion resistance, resistance to scaling, and ease of blow molding, have become a major competitor to enamel-lined tanks. However, because plastic tanks have thinner walls, it is not suitable to drill holes to reserve installation space for other components. Therefore, there is a need to provide an electric water heater product that minimizes the number of openings in the inner tank to adapt to both traditional and emerging inner tank manufacturing processes. One approach to this problem is to adjust the installation methods and assembly steps of the various components of the electric water heater as much as possible.

[0003] For example, Chinese utility model patent CN210374044U, entitled "A Storage-Type Electric Water Heater," discloses: an inner tank (1), an electric heating element (2), an inlet pipe assembly (3), an outlet pipe assembly (4), a first elastic support wire (5), a second elastic support wire (6), and an outer shell (7) covering the inner tank (1); an installation port (11) is provided on one side of the inner tank (1), and a flange (8) is installed in the installation port (11), with the electric heating element (2) installed on the flange; the inlet pipe assembly (3) includes an inlet sleeve (31) and an inlet insulating hose (32), and the outlet pipe assembly (4) includes an outlet sleeve (41) and an outlet insulating hose (42), the inlet sleeve... (31) and the outlet sleeve (41) are both installed through the flange (8). The first end of the inlet insulating hose (32) is located inside the inner tank (1), and the second end of the inlet insulating hose (32) is inserted into the inlet sleeve (31). The first end of the outlet insulating hose (42) is located inside the inner tank (1), and the second end of the outlet insulating hose (42) is inserted into the outlet sleeve (41). The first end of the first elastic support wire (5) is connected to the flange (8), and the second end of the first elastic support wire (5) is connected to the first end of the inlet insulating hose (32). The first end of the second elastic support wire (6) is connected to the flange (8), and the second end of the second elastic support wire (6) is connected to the first end of the outlet insulating hose (42). The inlet insulating hose also includes an extended extension section, which is located inside the inner tank (1) and has several water distribution holes (322). Although the technical solution described in this utility model solves the problem of a large number of openings in the inner tank by setting multiple components on the flange, it does not have an advantage in terms of the number of components inserted on the flange (such as the use of elastic support wires). Moreover, it cannot ensure that cold water enters the inner tank evenly without disturbing the upper hot water layer.

[0004] For example, Chinese invention application CN110160256A, entitled "A Storage-Type Electric Water Heater," discloses: an inner tank (1), an electric heating element (2), an inlet pipe assembly (3), an outlet pipe assembly (4), and a shell (5) fitted over the inner tank (1); an installation port (11) is provided on one side of the inner tank, and a flange (6) is installed in the installation port (11), with the electric heating element (2) installed on the flange (6); the inlet pipe assembly (3) includes an inlet sleeve (31) and an inlet insulating hose (32), with the first end of the inlet insulating hose (32) located inside the inner tank (1) and the second end of the inlet insulating hose (32) inserted into the inlet sleeve (31); the outlet pipe assembly (4) includes an outlet sleeve (41) and an outlet... An insulating hose (42) is provided at its first end inside the inner tank (1) and at its second end inserted into the outlet sleeve (41). The inlet sleeve (31) includes an inlet sleeve front section (311) and an inlet sleeve rear section (312) connected to each other. The inlet sleeve front section (311) is mounted on the flange (6) and the inlet sleeve rear section (312) can be switched between a first installation position and a first use position. The outlet sleeve (41) includes an outlet sleeve front section (411) and an outlet sleeve rear section (412) connected to each other. The outlet sleeve front section (411) is mounted on the flange (6) and the outlet sleeve rear section (412) can be switched between a second installation position and a second use position. The rear section (312) of the inlet sleeve is rotatably inserted into the front section (311) of the inlet sleeve; the rear section (412) of the outlet sleeve is rotatably inserted into the front section (411) of the outlet sleeve. Although the technical solution described in this invention application solves the problem of a large number of openings in the inner tank by setting multiple components on the flange, and minimizes disturbance to the hot water layer by switching the installation position and the usage position, it cannot guarantee the uniformity of cold water entering the inner tank. Moreover, there are many difficulties in switching positions during actual operation, which increases the difficulty of operation. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a storage-type electric water heater with fewer components, uniform cold water intake without disturbing the hot water layer, high hot water utilization rate and strong hot water supply capacity, reasonable and ingenious structural design, and convenient and simple installation and operation.

[0006] The present invention mainly adopts the following technical solution:

[0007] A storage-type electric water heater includes an inner tank, a heating element, an inlet pipe assembly, and an outlet pipe assembly. The inner tank has an installation port with a flange at the installation port. The flange has a recessed structure facing the installation port. The heating element is inserted into the flange and extends into the inner tank cavity through the installation port. The inlet pipe assembly and the outlet pipe assembly are also inserted into the flange. The inlet pipe assembly includes an inlet pipe and a flow-slowing sleeve. The flow-slowing sleeve has a flow-slowing hole and is at least partially fitted onto the inlet pipe so that the inlet pipe injects water into the inner tank cavity through the flow-slowing hole.

[0008] The slow-flow sleeve is horizontally positioned at the bottom of the inner liner cavity.

[0009] The slow-flow sleeve has one end face closed, and the other end face of the slow-flow sleeve has a through hole for the end of the water inlet pipe to pass into the slow-flow sleeve.

[0010] The water inlet pipe includes an open section, which is located near the end of the water inlet pipe and is fitted into the slow-flow sleeve.

[0011] The opening section is formed with circular holes distributed circumferentially along the wall of the water inlet pipe or with elongated holes distributed axially along the wall of the water inlet pipe.

[0012] The end of the water inlet pipe may be open or closed.

[0013] The slow-flow sleeve includes an end cap, a sleeve, and a plunger connected in sequence, and the plunger has the through hole.

[0014] The slow-flow sleeve also includes a cylindrical filter screen fitted inside the sleeve.

[0015] The slow-flow sleeve has through holes on both ends for the end of the water inlet pipe to pass through. The end of the water inlet pipe is closed. The water inlet pipe includes an open section, which is fitted into the slow-flow sleeve.

[0016] The opening section is formed with circular holes distributed circumferentially along the wall of the water inlet pipe or with elongated holes distributed axially along the wall of the water inlet pipe.

[0017] The slow-flow sleeve includes an end cap, a sleeve, and a plunger connected in sequence, and the end cap and the plunger are both provided with the through hole.

[0018] The slow-flow sleeve also includes a cylindrical filter screen disposed inside the sleeve.

[0019] The slow-flow sleeve uses a cylindrical filter screen.

[0020] The water inlet pipe assembly further includes a water inlet pipe connector, which is connected to the water inlet pipe through a water inlet hole opened on the flange, and the outer wall of the water inlet pipe connector is provided with external threads.

[0021] The water outlet assembly includes a water outlet pipe, and the water inlet of the water outlet pipe is located at the upper part of the inner liner cavity.

[0022] The water outlet pipe extends along the water inlet pipe and has a bent structure.

[0023] The water outlet pipe extends upward at an angle in a straight line within the inner liner, and the angle between the water outlet pipe and the horizontal direction is less than 60 degrees.

[0024] The water outlet pipe assembly further includes a water outlet pipe connector, which is connected to the water outlet pipe through a water outlet hole formed on the flange. The outer wall of the water outlet pipe connector is provided with an external thread, and the inner wall of the water outlet pipe connector is provided with an internal thread.

[0025] The water outlet pipe has a beveled end near the flange, and a flange is formed on the edge of the water outlet pipe at the beveled end. A limiting notch is formed on the edge of the water outlet hole. The water outlet pipe assembly also includes a hollow limiting screw. The water outlet pipe passes through the water outlet hole and abuts against the limiting notch through the flange. The hollow limiting screw is screwed into the internal thread of the inner wall of the water outlet pipe connector and abuts against the flange.

[0026] The water outlet pipe assembly further includes a limiting ring. One side of the limiting ring has a limiting boss that mates with the limiting notch, and the other side of the limiting ring has a limiting countersunk that mates with the flange. The water outlet pipe first passes through the limiting ring and then through the water outlet hole, and is held against the flange and / or the limiting ring by the hollow limiting screw.

[0027] The center hole of the limiting ring is elliptical on the side of the limiting platform, matching the oblique cut, and circular on the side of the limiting boss, matching the water outlet pipe.

[0028] The limiting boss is in the shape of a semi-concealed arc surface.

[0029] The heating element is positioned above the water inlet pipe and has a bent structure.

[0030] The flange is also equipped with a temperature probe, one end of which extends into the inner liner cavity and is closed. A temperature sensor is installed inside the temperature probe.

[0031] According to the technical solution described in this invention, the following beneficial effects are achieved: the inlet pipe assembly and the outlet pipe assembly are also inserted into the flange, which can effectively avoid the problem of too many openings in the inner tank; the slow-flow sleeve is at least partially sleeved on the inlet pipe and injects water into the inner tank cavity through the slow-flow hole, which can make cold water enter the inner tank cavity evenly and improve the hot water utilization rate; the slow-flow sleeve is set horizontally at the bottom of the inner tank cavity, which effectively reduces the disturbance to the upper hot water layer, extends the hot water supply capacity and is more energy-efficient; the inlet of the outlet pipe is located at the upper part of the inner tank cavity, and the outlet pipe extends along the inlet pipe. The outlet pipe has a bent structure, which makes it easy for workers to install various components through the installation port without affecting the hot water supply effect of cold water entering the bottom of the inner tank and hot water being discharged from the top of the inner tank; by setting the inlet pipe joint and the outlet pipe joint, ordinary PPR pipes can be used to replace the anti-electric wall, which is low in cost and has a high safety factor. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a storage-type electric water heater where the outlet pipe extends along the inlet pipe.

[0033] Figure 2 for Figure 1 A schematic diagram of the components mounted on the flange.

[0034] Figure 3 for Figure 2 The diagram shows the exploded structure of the inlet pipe and the flow-retardant sleeve in the embodiment shown.

[0035] Figure 4 This is a schematic diagram of the components mounted on the flange in another embodiment.

[0036] Figure 5 for Figure 4 The diagram shows the exploded structure of the inlet pipe and the flow-retardant sleeve in the embodiment shown.

[0037] Figure 6 This is a schematic diagram of the components mounted on the flange in another embodiment.

[0038] Figure 7 for Figure 6 The diagram shows the exploded structure of the inlet pipe and the flow-retardant sleeve in the embodiment shown.

[0039] Figure 8 This is a front view structural diagram of the flange.

[0040] Figure 9 This is a side view of the flange structure.

[0041] Figure 10 This is a schematic diagram of a storage-type water heater with a straight water outlet pipe.

[0042] Figure 11 for Figure 10 Schematic diagram of the disassembled structure of the central water outlet pipe installation.

[0043] Figure 12 for Figure 10 The illustrated embodiment shows an exploded view of the components mounted on the flange.

[0044] Figure 13 for Figure 12 Schematic diagram of the sectional structure of the side section.

[0045] Figure 14 for Figure 13 Enlarged view of section A.

[0046] Figure 15 This is a schematic diagram of one side of the limiting ring structure.

[0047] Figure 16 This is a schematic diagram of the structure on the other side of the limiting ring.

[0048] 1. Flange, X Flange front, Y Flange water-immersed surface, 10. Through hole, 11. Water inlet hole, 12. Water outlet hole, 2. Water inlet pipe assembly, 21. Water inlet pipe, 210. Round hole, 210'. Long strip hole, 211. Opening section, 22. Slow flow sleeve, 220. Slow flow hole, 221. End cap, 222. Piston, 2220. Through hole, 223. Sleeve, 224. Cylindrical filter screen, 23. Water inlet pipe connector, 3. Heating element, 31. Wiring terminal, 4. Temperature probe tube, 5. Water outlet pipe assembly, 51. Water outlet pipe, 510. Water inlet, 510'. Beveled cut, 511. Flanged edge, 52. Water outlet pipe connector, 53. Hollow limit screw, 54. Limit ring, 540. Center hole, 541. Limit boss, 542. Limit countersunk platform, 6. Inner liner, 61. Mounting port. Detailed Implementation

[0049] See Figure 1 , 2As shown in Figures 4, 6, and 10-14, a storage-type electric water heater includes an inner tank 6, a heating element 3, an inlet pipe assembly 2, and an outlet pipe assembly 5. The inner tank 6 has an installation port 61, and a flange 1 is provided at the installation port 61. The flange 1 has a recessed structure facing the installation port 61. The heating element 3 is inserted into the flange 1 and extends into the cavity of the inner tank 6 through the installation port 61. The inlet pipe assembly 2 and the outlet pipe assembly 5 are also inserted into the flange 1. The inlet pipe assembly 2 includes an inlet pipe 21 and a flow-slowing sleeve 22. The flow-slowing sleeve 22 has a flow-slowing hole 220. The flow-slowing sleeve 22 is at least partially fitted onto the inlet pipe 21 so that the inlet pipe 21 injects water into the cavity of the inner tank 6 through the flow-slowing hole 220. In this application, the flange 1 has a recessed structure facing the installation port 61, which facilitates assembly operations and also facilitates a sealing connection between the flange 1 and the installation port 61. Preferably, the metal outer tube of the heating element 3 is welded to the water-immersed surface Y side of the flange 1. The terminal 31 passes through the wire hole 10 on the flange 1 to connect the lead-out rod of the heating element 3 to an external power supply. More preferably, the terminal 31 is welded to the lead-out rod. Preferably, there is at least one heating element 3. To achieve rapid heating, more preferably, there are at least two heating elements 3. Preferably, the flow-retarding holes 220 are distributed circumferentially along the wall of the flow-retarding sleeve 22 or axially along the wall of the flow-retarding sleeve 22. More preferably, to avoid disturbing the upper hot water layer in the inner tank cavity, the flow-retarding holes distributed axially along the wall of the flow-retarding sleeve 22 are opened towards the bottom of the inner tank 6. Preferably, the flow-retarding holes 220 can be circular holes or elongated holes.

[0050] See Figure 1 , 10 As shown in Figure 11, the slow-flow sleeve 22 is horizontally positioned at the bottom of the inner tank 6 cavity. In this application, depending on the actual placement of the inner tank during use, for example, a side-lying inner tank 6 can use a submersible water inlet pipe 21, so that the slow-flow sleeve 22 sleeved on the water inlet pipe 21 can be horizontally positioned at the bottom of the inner tank 6 cavity, thus minimizing disturbance to the upper hot water layer of the inner tank 6 cavity; for a vertical inner tank, the specific shape of the water inlet pipe can be adjusted according to whether it is convenient to smoothly extend into the inner tank through the installation port, so that the slow-flow sleeve sleeved on the water inlet pipe can be horizontally positioned at the bottom of the inner tank cavity, thereby avoiding disturbance to the upper hot water layer of the inner tank cavity.

[0051] See Figure 1-5 As shown in Figures 10-13, one end face of the slow-flow sleeve 22 is closed, and the other end face of the slow-flow sleeve 22 is provided with a through hole 2220 for the end of the water inlet pipe 21 to pass into the slow-flow sleeve 22.

[0052] See Figure 3 , 5As shown in Figures 7 and 12, the water inlet pipe 21 includes an opening section 211, which is located near the end of the water inlet pipe 21 and is fitted inside the slow-flow sleeve 22.

[0053] See Figure 3 , 5 As shown in Figures 7 and 12, the opening section 211 is formed with circular holes 210 distributed circumferentially along the wall of the water inlet pipe 21 or with elongated holes 210' distributed axially along the wall of the water inlet pipe 21. Preferably, when the opening section 211 is formed with elongated holes 210' distributed axially along the wall of the water inlet pipe 21, the orientation of the elongated holes 210' is not too restricted. This is because, in order to avoid disturbing the upper hot water layer of the inner tank, the slow-flow hole 220 is generally set to face the bottom of the inner tank cavity. For example, the elongated hole 210' can be set to face the top of the inner tank cavity or the bottom of the inner tank cavity. When the orientation of the slow-flow hole 220 changes, the orientation of the elongated hole 210' also changes accordingly.

[0054] See Figure 3 , 5 As shown in Figures 7 and 12, the end of the water inlet pipe 21 can be open or closed.

[0055] See Figure 3 , 5 As shown in Figure 12, the slow-flow sleeve 22 includes an end cap 221, a sleeve 223 and a plunger 222 connected in sequence, and a through hole 2220 is provided on the plunger 222.

[0056] See Figure 5 As shown, the flow-slowing sleeve 22 also includes a cylindrical filter screen 224 sleeved inside the sleeve 223. Preferably, when the flow-slowing sleeve 22 includes the cylindrical filter screen 224, it generally corresponds to the case where elongated flow-slowing holes 220 are provided along the axial direction of the sleeve wall of the flow-slowing sleeve 22.

[0057] Furthermore, both ends of the slow-flow sleeve 22 are provided with through holes 2220 for the end of the water inlet pipe 21 to pass through. The end of the water inlet pipe 21 is closed. The water inlet pipe 21 includes an opening section 211, which is fitted into the slow-flow sleeve 22.

[0058] See Figure 3 , 5As shown in Figures 7 and 12, the opening section 211 is formed with circular holes 210 distributed circumferentially along the wall of the water inlet pipe 21 or with elongated holes 210' distributed axially along the wall of the water inlet pipe 21. Preferably, when the opening section 211 is formed with elongated holes 210' distributed axially along the wall of the water inlet pipe 21, the orientation of the elongated holes 210' is not too restricted. This is because, in order to avoid disturbing the upper hot water layer of the inner tank, the slow-flow hole 220 is generally set to face the bottom of the inner tank cavity. For example, the elongated hole 210' can be set to face the top of the inner tank cavity or the bottom of the inner tank cavity. When the orientation of the slow-flow hole 220 changes, the orientation of the elongated hole 210' also changes accordingly.

[0059] Furthermore, the slow-flow sleeve 22 includes an end cap 221, a sleeve 223 and a plunger 222 connected in sequence, and both the end cap 221 and the plunger 222 are provided with through holes 2220.

[0060] See Figure 5 As shown, the slow-flow sleeve 22 also includes a cylindrical filter screen 224 disposed inside the sleeve 223.

[0061] See Figure 7 As shown, the slow-flow sleeve 22 uses a cylindrical filter screen 224.

[0062] See Figure 1 , 2 As shown in Figures 4, 6, 8-14, the water inlet pipe assembly 2 also includes a water inlet pipe connector 23. The water inlet pipe connector 23 is connected to the water inlet pipe 21 through a water inlet hole 11 opened on the flange 1, and the outer wall of the water inlet pipe connector 23 is provided with external threads. Preferably, the water inlet pipe connector 23 is fixedly connected to the front X of the flange by welding. In this application, the water inlet pipe connector is connected to the external water source pipeline through external threads. With this structural design, the use of expensive anti-electric shock walls can be avoided, and the same effect can be achieved by simply replacing it with ordinary PPR pipes.

[0063] See Figure 1 , 2 As shown in Figures 4, 6, 10-13, the water outlet assembly 5 includes a water outlet pipe 51, and the water inlet 510 of the water outlet pipe 51 is located at the upper part of the inner liner 6 cavity.

[0064] See Figure 1 , 2 As shown in Figures 4 and 6, the water outlet pipe 51 extends along the water inlet pipe 21, and the water outlet pipe 51 has a bent structure. In this application, the water inlet pipe 21 may or may not have a bend. Preferably, in order to facilitate installation through the installation port 61, the water outlet pipe 51 extends along the extension direction of the water inlet pipe 21, and after reaching a position flush with the end of the water inlet pipe 21, it bends and extends towards the top of the inner liner 6 cavity.

[0065] See Figure 10-14 As shown, the water outlet pipe 51 extends upward at an angle in a straight line within the inner liner 6, and the angle between the water outlet pipe 51 and the horizontal direction is less than 60 degrees. Preferably, for ease of assembly, the angle between the water outlet pipe 51 and the horizontal direction is less than 30 degrees.

[0066] See Figure 1 , 2 As shown in Figures 4, 6, 8-14, the water outlet pipe assembly 5 also includes a water outlet pipe connector 52. The water outlet pipe connector 52 is connected to the water outlet pipe 51 through a water outlet hole 12 formed on the flange 1. The outer wall of the water outlet pipe connector 52 is provided with external threads, and the inner wall of the water outlet pipe connector 52 is provided with internal threads. Preferably, the water outlet pipe connector 52 is fixedly connected to the front X of the flange by welding. In this application, the water outlet pipe connector is connected to the external water supply pipeline through external threads. With this structural design, the use of expensive anti-electric shock walls can be avoided, and the same effect can be achieved by simply replacing it with ordinary PPR pipes.

[0067] See Figure 10-14 As shown, the water outlet pipe 51 has a beveled cut 510' at one end near the flange 1. The edge of the water outlet pipe 51 at the beveled cut 510' also has a flange 511. The edge of the water outlet hole 12 has a limiting notch. The water outlet pipe assembly 5 also includes a hollow limiting screw 53. The water outlet pipe 51 passes through the water outlet hole 12 and abuts against the limiting notch through the flange 511. The hollow limiting screw 53 is screwed into the internal thread of the inner wall of the water outlet pipe connector 52 and abuts against the flange 511.

[0068] See Figure 11-16 As shown, the water outlet pipe assembly 5 also includes a limiting ring 54. One side of the limiting ring 54 has a limiting boss 541 that matches the limiting notch, and the other side of the limiting ring 54 has a limiting countersunk 542 that matches the flange 511. The water outlet pipe 51 first passes through the limiting ring 54 and then through the water outlet hole 12, and is held against the flange 511 and / or the limiting ring 54 by the hollow limiting screw 53.

[0069] See Figure 15 , 16 As shown, the center hole 540 of the limiting ring 54 is elliptical on the side of the limiting platform 542 that matches the oblique cut 510', and circular on the side of the limiting boss 541 that matches the water outlet pipe 51.

[0070] See Figure 15 As shown, the limiting boss 541 is in the shape of a semi-concealed arc surface. Preferably, in order to better position the limiting ring 54 at the edge of the water outlet 12 and prevent the limiting ring 54 from rotating and slipping, the limiting ring 54 is also provided with a positioning boss, and the edge of the water outlet 12 is also formed with a positioning notch that cooperates with the positioning boss.

[0071] See Figure 1 , 2 As shown in Figures 4, 6, 10-13, the heating element 3 is positioned above the water inlet pipe 21, and the heating element 3 has a bent structure. In this application, in order to heat the water in the inner liner cavity more quickly and evenly, the heating element can be bent at least once to increase the contact area with the water and improve the heating speed.

[0072] See Figure 1 , 10 As shown in Figure -13, a temperature probe tube 4 is also installed on the flange 1. The end of the temperature probe tube 4 that extends into the cavity of the inner liner 6 is closed, and a temperature sensor is installed inside the temperature probe tube 4.

[0073] Although specific embodiments of the present invention have been described above, those skilled in the art can make modifications to them without departing from the spirit and principles of the present invention. The scope of protection of the present invention is defined by its claims and their equivalents.

Claims

1. A storage-type electric water heater, comprising an inner tank, a heating element, an inlet pipe assembly, and an outlet pipe assembly, wherein the inner tank has an installation port, a flange is provided at the installation port, the flange has a recessed structure facing the installation port, the heating element is inserted into the flange and extends into the inner tank cavity through the installation port, characterized in that: The inlet pipe assembly and the outlet pipe assembly are also inserted into the flange. The inlet pipe assembly includes an inlet pipe and a flow-slowing sleeve. The flow-slowing sleeve has a flow-slowing hole and is at least partially fitted onto the inlet pipe so that the inlet pipe injects water into the inner liner cavity through the flow-slowing hole. The outlet pipe assembly also includes an outlet pipe connector, which is connected to the outlet pipe through an outlet hole on the flange. The outer wall of the outlet pipe connector has an external thread, and the inner wall of the outlet pipe connector has an internal thread. The outlet pipe has a beveled end near the flange, and the edge of the outlet pipe at the beveled end also has a flange. The edge of the outlet hole has a limiting notch. The outlet pipe assembly also includes a hollow limiting screw, through which the outlet pipe passes and... The flange abuts against the limiting notch, and the hollow limiting screw is screwed into the internal thread of the water outlet pipe connector and abuts against the flange; the water outlet pipe extends upward in a straight line within the inner liner at an angle of less than 60 degrees to the horizontal direction; the water outlet pipe assembly also includes a limiting ring, one side of which has a limiting boss that mates with the limiting notch, and the other side of which has a limiting countersunk that mates with the flange; the water outlet pipe passes through the limiting ring and then through the water outlet hole, and abuts against the flange and / or the limiting ring through the hollow limiting screw; the center hole of the limiting ring is elliptical on the side of the limiting countersunk that matches the oblique cut, and circular on the side of the limiting boss that matches the water outlet pipe; the limiting boss is a semi-concealed arc surface.

2. The storage-type electric water heater according to claim 1, characterized in that: The slow-flow sleeve is horizontally positioned at the bottom of the inner liner cavity.

3. The storage-type electric water heater according to claim 1 or 2, characterized in that: One end face of the slow-flow sleeve is closed, and the other end face of the slow-flow sleeve has a through hole for the end of the water inlet pipe to pass into the slow-flow sleeve.

4. The storage-type electric water heater according to claim 3, characterized in that: The water inlet pipe includes an open section, which is located near the end of the water inlet pipe and is fitted into the slow-flow sleeve.

5. The storage-type electric water heater according to claim 4, characterized in that: The opening section has circular holes distributed circumferentially along the wall of the water inlet pipe or elongated holes distributed axially along the wall of the water inlet pipe.

6. The storage-type electric water heater according to claim 4 or 5, characterized in that: The end of the water inlet pipe can be open or closed.

7. The storage-type electric water heater according to claim 3, characterized in that: The slow-flow sleeve includes an end cap, a sleeve, and a plunger connected in sequence, and the plunger has the through hole.

8. The storage-type electric water heater according to claim 7, characterized in that: The slow-flow sleeve also includes a cylindrical filter screen fitted inside the sleeve.

9. The storage-type electric water heater according to claim 1 or 2, characterized in that: Both ends of the slow-flow sleeve are provided with through holes for the end of the water inlet pipe to pass through. The end of the water inlet pipe is closed. The water inlet pipe includes an open section, which is fitted into the slow-flow sleeve.

10. The storage-type electric water heater according to claim 9, characterized in that: The opening section has circular holes distributed circumferentially along the wall of the water inlet pipe or elongated holes distributed axially along the wall of the water inlet pipe.

11. The storage-type electric water heater according to claim 9, characterized in that: The slow-flow sleeve includes an end cap, a sleeve, and a plunger connected in sequence, and the end cap and the plunger are both provided with the through hole.

12. The storage-type electric water heater according to claim 11, characterized in that: The slow-flow sleeve also includes a cylindrical filter screen disposed inside the sleeve.

13. The storage-type electric water heater according to claim 9, characterized in that: The slow-flow sleeve uses a cylindrical filter screen.

14. The storage-type electric water heater according to any one of claims 1 to 2, 4 to 5, 7 to 8, and 10 to 13, characterized in that: The water inlet pipe assembly also includes a water inlet pipe connector, which is connected to the water inlet pipe through a water inlet hole provided on the flange, and the outer wall of the water inlet pipe connector is provided with external threads.

15. The storage-type electric water heater according to claim 14, characterized in that: The water outlet assembly includes a water outlet pipe, and the water inlet of the water outlet pipe is located at the upper part of the inner liner cavity.

16. The storage-type electric water heater according to any one of claims 1 to 2, 4 to 5, 7 to 8, 10 to 13, and 15, characterized in that: The heating element is positioned above the water inlet pipe, and the heating element has a bent structure.

17. The storage-type electric water heater according to any one of claims 1 to 2, 4 to 5, 7 to 8, 10 to 13, and 15, characterized in that: The flange is also equipped with a temperature probe, one end of which extends into the inner liner cavity and is closed, and a temperature sensor is installed inside the temperature probe.

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