Water heating assembly of instant electric water heater

Abstract

The utility model provides a water heating assembly of an instant electric water heater, which comprises an electric heating component and a heating liner, the heating liner is provided with an inner cavity with an opening at the upper end, the heating end of the electric heating component is inserted into the inner cavity from top to bottom, and the upper end of the electric heating component and the upper end of the heating liner are fixed and peripherally sealed; a water inlet connector and a water outlet connector which are communicated with the inner cavity are formed in the side wall of the heating container; a pressure relief valve seat is arranged on the outer wall of the heating container, a pressure relief channel is formed in the inner side of the pressure relief valve seat, a through hole communicated with the inner cavity and the pressure relief channel is formed in the side wall of the heating container, and a pressure relief hole communicated with the pressure relief channel is formed in the pressure relief valve seat; a valve element assembly is arranged in the pressure relief channel. When the water pressure in the inner cavity exceeds the opening pressure of the valve element assembly, the valve element assembly is opened, and water located in the inner cavity is discharged through the through hole, the pressure relief channel and the pressure relief hole in sequence for pressure relief. According to the utility model, the heating liner can be effectively prevented from bursting, and the potential safety hazard is eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of instant electric water heaters, and in particular to a water heating component of an instant electric water heater. Background Art

[0002] An instant electric water heater is a device for heating water. The instant electric water heaters currently on the market include an electric heating component and a heating tank. The heating tank has an inner cavity with an upper end opening. The heating end of the electric heating component is inserted into the inner cavity from top to bottom. The upper end of the electric heating component is fixed to the upper end of the heating tank and is circumferentially sealed. A water inlet interface and a water outlet interface connected to the inner cavity are provided on the side wall of the heating tank. When water enters the heating tank through the water inlet interface, the electric heating component can heat the water entering the heating tank. After the water in the heating tank is heated by the electric heating component, it can be discharged through the water outlet interface. However, in the existing instant electric water heaters, since the heating tank is a closed structure, the electric heating component will increase its volume during the process of heating the water in the heating tank because the water in the heating tank is heated, thereby increasing the water pressure in the heating tank. When the water pressure in the heating tank exceeds the pressure that the heating tank can withstand, the heating tank will burst, thereby posing a greater safety hazard. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a water heating component of an instant electric water heater. When in use, when the water pressure in the heating vessel exceeds the opening pressure of the valve core component, the valve core component can be opened, so that the water in the heating vessel can be depressurized, that is, the explosion of the heating vessel can be effectively avoided, eliminating the safety hazard.

[0004] The utility model provides a water heating component of an instant electric water heater, comprising an electric heating component and a heating vessel, the heating vessel having an inner cavity with an upper end opening, the heating end of the electric heating component being inserted into the inner cavity from top to bottom, the upper end of the electric heating component being fixed to the upper end of the heating vessel and being circumferentially sealed; a water inlet interface and a water outlet interface communicating with the inner cavity are arranged on the side wall of the heating vessel; a pressure relief valve seat is arranged on the outer wall of the heating vessel, a pressure relief channel is formed on the inner side of the pressure relief valve seat, a through hole communicating with both the inner cavity and the pressure relief channel is arranged on the side wall of the heating vessel, and a pressure relief hole communicating with the pressure relief channel is arranged on the pressure relief valve seat; a valve core assembly is arranged in the pressure relief channel, the valve core assembly is used for cutting off the passage between the through hole and the pressure relief channel; when the water pressure in the inner cavity exceeds the opening pressure of the valve core assembly, the valve core assembly is opened and the water in the inner cavity is discharged in sequence through the through hole, the pressure relief channel and the pressure relief hole for pressure relief.

[0005] After the utility model adopts the above structure, when the water pressure in the heating vessel exceeds the opening pressure of the valve core assembly, the valve core assembly can be opened, and the water in the inner cavity is discharged through the through hole, the pressure relief channel and the pressure relief hole in sequence to relieve the pressure, which can effectively avoid the heating vessel from bursting and eliminate safety hazards.

[0006] In a possible implementation, the pressure relief valve seat is a tubular structure, one end of the pressure relief valve seat is connected to the outer wall of the heating tank, a first annular step is formed on the inner side of the connection between the pressure relief valve seat and the heating tank, and the pressure relief hole is arranged on the side wall of the pressure relief valve seat; the valve core assembly includes a sealing ring, a valve ball, a spring and a stop cover, the sealing ring, the valve ball and the spring are arranged in the pressure relief valve seat from the inside to the outside in sequence, the sealing ring abuts against the first annular step, the stop cover is connected to the other end of the pressure relief valve seat, the two ends of the spring abut against the valve ball and the stop cover respectively, and the spring is used to push the valve ball so that the valve ball and the sealing ring are tightly sealed to cut off the passage between the through hole and the pressure relief channel; after adopting this structure, when the water in the inner cavity When the water pressure in the inner cavity exceeds the opening pressure of the valve core assembly, the water in the inner cavity can push the valve ball so that the valve ball compresses the spring. At this time, a gap can be generated between the valve ball and the sealing ring, that is, the water in the inner cavity can be depressurized through the through hole, the gap between the valve ball and the sealing ring, the pressure relief channel and the pressure relief hole, so as to avoid the situation where the water pressure in the heating tank is too high and causes the heating tank to burst; when the water pressure in the inner cavity is reduced to the opening pressure of the valve core assembly, the spring can push the valve ball to reset it. At this time, the valve ball can be tightly sealed with the sealing ring again, that is, the valve core assembly can cut off the passage between the through hole and the pressure relief channel, that is, when the water pressure in the inner cavity returns to normal, the valve core assembly will automatically close.

[0007] In one possible embodiment, the baffle cover is movable and adjustably connected to the other end of the pressure relief valve seat along the axial direction of the spring. When the baffle cover is adjusted to move along the axial direction of the spring, the baffle cover is used to control the degree of compression of the spring to change the opening pressure of the valve core assembly. By adopting this structure, when the baffle cover is adjusted to move along the axial direction of the spring, the baffle cover can control the degree of compression of the spring, that is, it can change the thrust of the spring on the valve ball, thereby changing the opening pressure of the valve core assembly, that is, it can adjust the opening pressure of the valve core assembly to a desired state.

[0008] In a possible implementation, the baffle cover is arranged on the inner side of the other end of the pressure relief valve seat and is threadedly connected to the inner wall of the pressure relief valve seat; after adopting this structure, since the baffle cover is arranged on the inner side of the other end of the pressure relief valve seat and is threadedly connected to the inner wall of the pressure relief valve seat, when the baffle cover is twisted, the baffle cover can move along the axial direction of the spring, and when the baffle cover moves along the axial direction of the spring, the baffle cover can control the degree of compression of the spring, that is, it can change the thrust of the spring on the valve ball, thereby changing the opening pressure of the valve core assembly, that is, it can adjust the opening pressure of the valve core assembly to a desired state.

[0009] In a possible embodiment, a second annular step for abutting against the inner end of the baffle cover is provided on the inner side of the other end of the pressure relief valve seat, and when the baffle cover is adjusted to move the baffle cover along the axial direction of the spring, the second annular step is used to control the inward movement stroke of the baffle cover and control the degree of compression of the spring by the baffle cover to control the maximum opening pressure of the valve core assembly; after the second annular step is provided on the inner side of the other end of the pressure relief valve, when the baffle cover is adjusted to move the baffle cover along the axial direction of the spring, the second annular step can control the inward movement stroke of the baffle cover, that is, the second annular step can control the maximum compression degree of the spring by the baffle cover to control the maximum opening pressure of the valve core assembly, and the maximum opening pressure of the valve core assembly is less than the bursting pressure that the heating tank can withstand; in addition, under the action of the second annular step, when the position of the baffle cover is adjusted, the spring can be prevented from being in a fully compressed state, that is, the valve core assembly can be prevented from being adjusted to a state where it cannot be opened, thereby avoiding the safety hazard of the heating tank bursting due to the inability to reliably open the valve core assembly.

[0010] In a possible embodiment, a regular hexagonal countersunk hole is provided in the middle of the outer end of the baffle cover, and the countersunk hole is used to cooperate with and be plugged into the end of an external hexagonal wrench to facilitate the external hexagonal wrench to twist the baffle cover; by adopting this structure, when the baffle cover needs to be twisted to adjust the opening pressure of the valve core assembly, the countersunk hole can cooperate with and be plugged into the end of the external hexagonal wrench to facilitate the external hexagonal wrench to twist the baffle cover, thereby facilitating the adjustment of the opening pressure of the valve core assembly.

[0011] In a possible embodiment, the electric heating component includes an end cover and at least one "U"-shaped electric heating tube, the electric heating tube is inserted into the inner cavity from top to bottom, and the two conductive ends of the electric heating tube pass through the end cover from bottom to top and then extend out of the end cover, each conductive end of the electric heating tube is welded and fixed to the end cover and circumferentially sealed, and the end cover is fixed and circumferentially sealed to the upper end of the heating tank; by adopting this electric heating component, the "U"-shaped electric heating tube can increase the contact area with the water in the inner cavity, thereby improving the heat conduction efficiency between the electric heating tube and the water, that is, it can improve the heating efficiency of the water in the inner cavity. In addition, since the heat conduction efficiency between the electric heating tube and the water can be improved, the electric heating tube can dissipate heat faster to avoid overheating and damage to the electric heating tube. In other words, under the same structure, the heating power of the electric heating tube can be made larger to improve the heating efficiency of the electric heating tube to the water in the inner tank.

[0012] In a possible embodiment, a third annular step is provided on the inner side of the upper end of the heating tank, the outer edge of the end cover is supported on the third annular step, a sealing gasket is embedded between the outer edge of the end cover and the third annular step, and the water heating assembly also includes a pressure ring, which is provided above the end cover, fixed to the upper end of the heating tank and used to press the end cover and the sealing gasket onto the third annular step; by adopting the above structure, the end cover can be reliably fixed to the upper end of the heating tank and circumferentially sealed to avoid water leakage, and in addition, the pressure ring can be fixed to the upper end of the heating tank by a plurality of bolts distributed at circumferential intervals.

[0013] In a possible embodiment, two electric heating tubes are provided, and the two electric heating tubes are inserted into the inner cavity at an interval, one of the conductive ends of each electric heating tube is electrically connected to one of the conductive ends of the other electric heating tube through the first conductive sheet, and the other conductive end of each electric heating tube is electrically connected to the other conductive end of the other electric heating tube through the second conductive sheet, and the two electric heating tubes are connected in parallel through the first conductive sheet and the second conductive sheet; by adopting two electric heating tubes, the heating efficiency of the water in the inner tank can be further improved, that is, faster heating of the water in the inner tank can be achieved; in addition, the two electric heating tubes can be reliably connected in parallel through the first conductive sheet and the second conductive sheet, that is, it can facilitate the wiring of the two electric heating tubes.

[0014] In a possible implementation, the heating vessel is made of plastic material. By using plastic material to make the heating vessel, not only is the manufacturing cost of the heating vessel low, but the heating vessel made of plastic material also has the advantage of good heat insulation effect, that is, it can better prevent the heat loss of water in the inner cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a first three-dimensional structural schematic diagram of the utility model;

[0016] Figure 2 This is a second three-dimensional structural schematic diagram of the utility model;

[0017] Figure 3 This is a schematic cross-sectional view of the utility model after removing the water inlet pipe and the water outlet pipe;

[0018] Figure 4 for Figure 1 The schematic diagram of the structure after the enlargement of A in the middle;

[0019] Figure 5 It is a schematic diagram of the partially exploded three-dimensional structure of the utility model after removing the water inlet pipe and the water outlet pipe. DETAILED DESCRIPTION

[0020] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0021] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0022] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0023] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] See also Figure 1-5 As shown, the embodiment of the present application discloses a water heating component of an instant electric water heater, comprising an electric heating component 1 and a heating tank 2, the heating tank 2 having an inner cavity 21 with an upper end opening, the heating end of the electric heating component 1 being inserted into the inner cavity 21 from top to bottom, the upper end of the electric heating component 1 being fixed to the upper end of the heating tank 2 and being circumferentially sealed; a water inlet interface 22 and a water outlet interface 23 communicating with the inner cavity 21 are arranged on the side wall of the heating tank 2; a pressure relief valve seat 24 is arranged on the outer wall of the heating tank 2, and a pressure relief valve seat 24 is formed on the inner side of the pressure relief valve seat 24. A through hole 26 communicating with the inner cavity 21 and the pressure relief channel 25 is arranged on the side wall of the heating tank 2, and a pressure relief hole 27 communicating with the pressure relief channel 25 is arranged on the pressure relief valve seat 24; a valve core assembly is arranged in the pressure relief channel 25, and the valve core assembly is used to cut off the passage between the through hole 26 and the pressure relief channel 25; when the water pressure in the inner cavity 21 exceeds the opening pressure of the valve core assembly, the valve core assembly opens and the water in the inner cavity 21 is discharged through the through hole 26, the pressure relief channel 25 and the pressure relief hole 27 in sequence for pressure relief.

[0025] The pressure relief valve seat 24 is a tubular structure, one end of the pressure relief valve seat 24 is connected to the outer wall of the heating tank 2, a first annular step 28 is formed on the inner side of the connection between the pressure relief valve seat 24 and the heating tank 2, and the pressure relief hole 27 is arranged on the side wall of the pressure relief valve seat 24; the valve core assembly includes a sealing ring 31, a valve ball 32, a spring 33 and a stop cover 34, the sealing ring 31, the valve ball 32 and the spring 33 are arranged in the pressure relief valve seat 24 from the inside to the outside, the sealing ring 31 is against the first annular step 28, the stop cover 34 is connected to the other end of the pressure relief valve seat 24, and the two ends of the spring 33 are respectively against the valve ball 32 and the stop cover 34, and the spring 33 is used to push the valve ball 32 so that the valve ball 32 and the sealing ring 31 are tightly sealed to separate the through hole 26 from the pressure relief channel 25. passage between; by adopting this structure, when the water pressure in the inner cavity exceeds the opening pressure of the valve core assembly, the water in the inner cavity can push the valve ball so that the valve ball compresses the spring. At this time, a gap can be generated between the valve ball and the sealing ring, that is, the water in the inner cavity can be depressurized through the through hole, the gap between the valve ball and the sealing ring, the pressure relief passage and the pressure relief hole, so as to avoid the situation that the water pressure in the heating tank is too large and causes the heating tank to burst; when the water pressure in the inner cavity is reduced to the opening pressure of the valve core assembly, the spring can push the valve ball to reset, at this time, the valve ball can be tightly sealed with the sealing ring again, that is, the valve core assembly can cut off the passage between the through hole and the pressure relief passage, that is, when the water pressure in the inner cavity returns to normal, the valve core assembly is automatically closed.

[0026] The stop cover 34 is movable and adjustably connected to the other end of the pressure relief valve seat 24 along the axial direction of the spring 33. When the stop cover 34 is adjusted to move along the axial direction of the spring 33, the stop cover 34 is used to control the degree of compression of the spring 33 to change the opening pressure of the valve core assembly. By adopting this structure, when the stop cover is adjusted to move along the axial direction of the spring, the stop cover can control the degree of compression of the spring, that is, it can change the thrust of the spring on the valve ball, thereby changing the opening pressure of the valve core assembly, that is, it can adjust the opening pressure of the valve core assembly to a desired state.

[0027] The baffle cover 34 is arranged on the inner side of the other end of the pressure relief valve seat 24 and is threadedly connected to the inner wall of the pressure relief valve seat 24; after adopting this structure, since the baffle cover is arranged on the inner side of the other end of the pressure relief valve seat and is threadedly connected to the inner wall of the pressure relief valve seat, when the baffle cover is twisted, the baffle cover can move along the axial direction of the spring. When the baffle cover moves along the axial direction of the spring, the baffle cover can control the compression degree of the spring, that is, it can change the thrust of the spring on the valve ball, thereby changing the opening pressure of the valve core assembly, that is, it can adjust the opening pressure of the valve core assembly to the desired state.

[0028] A second annular step 29 for abutting against the inner end of the stop cover 34 is provided on the inner side of the other end of the pressure relief valve seat 24. When the stop cover 34 is adjusted to move the stop cover 34 along the axial direction of the spring 33, the second annular step 29 is used to control the inward movement of the stop cover 34 and control the compression degree of the stop cover 34 on the spring 33 to control the maximum opening pressure of the valve core assembly; after the second annular step is provided on the inner side of the other end of the pressure relief valve, when the stop cover is adjusted to move the stop cover along the axial direction of the spring, the second annular step can control the inward movement of the stop cover, that is, the second annular step can control the maximum compression degree of the stop cover on the spring to control the maximum opening pressure of the valve core assembly, and the maximum opening pressure of the valve core assembly is less than the bursting pressure that the heating tank can withstand; in addition, under the action of the second annular step, when the position of the stop cover is adjusted, the spring can be prevented from being in a fully compressed state, that is, the valve core assembly can be prevented from being adjusted to a state where it cannot be opened, thereby avoiding the safety hazard of the heating tank bursting due to the inability to reliably open the valve core assembly.

[0029] A regular hexagonal countersunk hole 341 is provided in the middle of the outer end of the baffle cover 34, and the countersunk hole 341 is used to cooperate with the end of an external hexagonal wrench to facilitate the external hexagonal wrench to twist the baffle cover 34; by adopting this structure, when the baffle cover needs to be twisted to adjust the opening pressure of the valve core assembly, the countersunk hole can cooperate with the end of the external hexagonal wrench to facilitate the external hexagonal wrench to twist the baffle cover, thereby facilitating the adjustment of the opening pressure of the valve core assembly.

[0030] The electric heating component 1 includes an end cover 11 and at least one "U"-shaped electric heating tube 12, the electric heating tube 12 is inserted into the inner cavity 21 from top to bottom, and the two conductive ends of the electric heating tube 12 penetrate the end cover 11 from bottom to top and then extend out of the end cover 11, each conductive end of the electric heating tube 12 is welded and fixed to the end cover 11 and circumferentially sealed, and the end cover 11 is fixed and circumferentially sealed to the upper end of the heating tank 2; by adopting this electric heating component, the "U"-shaped electric heating tube can increase the contact area with the water in the inner cavity, thereby improving the heat conduction efficiency between the electric heating tube and the water, that is, it can improve the heating efficiency of the water in the inner cavity. In addition, since the heat conduction efficiency between the electric heating tube and the water can be improved, the electric heating tube can dissipate heat faster to avoid overheating and damage to the electric heating tube, or in other words, under the same structure, the heating power of the electric heating tube can be made larger to improve the heating efficiency of the electric heating tube to the water in the inner tank.

[0031] A third annular step 20 is arranged on the inner side of the upper end of the heating tank 2, the outer edge of the end cover 11 is supported on the third annular step 20, a sealing gasket is embedded between the outer edge of the end cover 11 and the third annular step 20, and the water heating assembly also includes a pressing ring 4, which is arranged above the end cover 11, fixed to the upper end of the heating tank 2 and used to press the end cover 11 and the sealing gasket onto the third annular step 20; by adopting the above structure, the end cover can be reliably fixed to the upper end of the heating tank and circumferentially sealed to avoid water leakage, and in addition, the pressing ring can be fixed to the upper end of the heating tank by a plurality of bolts distributed at circumferential intervals.

[0032] Two electric heating tubes 12 are provided, and the two electric heating tubes 12 are inserted into the inner cavity 21 at intervals. One of the conductive ends of each electric heating tube 12 is electrically connected to one of the conductive ends of the other electric heating tube 12 through the first conductive sheet 13, and the other conductive end of each electric heating tube 12 is electrically connected to the other conductive end of the other electric heating tube 12 through the second conductive sheet 14. The two electric heating tubes 12 are connected in parallel through the first conductive sheet 13 and the second conductive sheet 14; by adopting two electric heating tubes, the heating efficiency of the water in the inner tank can be further improved, that is, faster heating of the water in the inner tank can be achieved; in addition, the two electric heating tubes can be reliably connected in parallel through the first conductive sheet and the second conductive sheet, that is, it can facilitate the wiring of the two electric heating tubes.

[0033] The heating vessel 2 is made of plastic material; by using plastic material to make the heating vessel, not only the manufacturing cost of the heating vessel is low, but also the heating vessel made of plastic material has the advantage of good heat insulation effect, that is, it can better avoid the heat loss of water in the inner cavity.

[0034] In addition, the water heating component adopts a heating tube made of plastic material and is combined with a "U"-shaped electric heating tube (straight electric heating tube). The heating power of the water heating component can easily reach 5000-10000W.

[0035] The water heating assembly also includes a water inlet pipe 5 and a water outlet pipe 6, one end of the water inlet pipe 5 and one end of the water outlet pipe 6 are respectively connected to the water inlet interface 22 and the water outlet interface 23; by adopting this structure, the water inlet pipe can reliably deliver the water to be heated into the heating tank, and the water in the heating tank can be discharged from the water outlet pipe after being heated by the electric heating component.

[0036] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A water heating assembly of an instant electric water heater, comprising an electric heating component (1) and a heating vessel (2), the heating vessel (2) having an inner cavity (21) with an upper end open, the heating end of the electric heating component (1) being inserted into the inner cavity (21) from top to bottom, the upper end of the electric heating component (1) being fixed to the upper end of the heating vessel (2) and circumferentially sealed; a water inlet interface (22) and a water outlet interface (23) communicating with the inner cavity (21) are provided on the side wall of the heating vessel (2); the characteristics are as follows: A pressure relief valve seat (24) is arranged on the outer wall of the heating chamber (2), a pressure relief channel (25) is formed on the inner side of the pressure relief valve seat (24), a through hole (26) connected to both the inner cavity (21) and the pressure relief channel (25) is arranged on the side wall of the heating chamber (2), and a pressure relief hole (27) connected to the pressure relief channel (25) is arranged on the pressure relief valve seat (24); a valve core assembly is arranged in the pressure relief channel (25), and the valve core assembly is used to block the passage between the through hole (26) and the pressure relief channel (25); when the water pressure in the inner cavity (21) exceeds the opening pressure of the valve core assembly, the valve core assembly is opened and the water in the inner cavity (21) is discharged in sequence through the through hole (26), the pressure relief channel (25) and the pressure relief hole (27) to relieve pressure.

2. The water heating assembly of the instant electric water heater according to claim 1, characterized in that: The pressure relief valve seat (24) is a tubular structure, one end of the pressure relief valve seat (24) is connected to the outer wall of the heating chamber (2), a first annular step (28) is formed on the inner side of the connection between the pressure relief valve seat (24) and the heating chamber (2), and the pressure relief hole (27) is arranged on the side wall of the pressure relief valve seat (24); the valve core assembly comprises a sealing ring (31), a valve ball (32), a spring (33) and a stop cover (34), wherein the sealing ring (31), the valve ball (32) and the spring (33) are The pressure relief valve seat (24) is sequentially arranged from the inside to the outside, the sealing ring (31) abuts against the first annular step (28), the blocking cover (34) is connected to the other end of the pressure relief valve seat (24), and the two ends of the spring (33) abut against the valve ball (32) and the blocking cover (34) respectively. The spring (33) is used to push the valve ball (32) so that the valve ball (32) and the sealing ring (31) are tightly sealed to block the passage between the through hole (26) and the pressure relief channel (25).

3. The water heating assembly of the instant electric water heater according to claim 2, characterized in that: The stop cover (34) is connected to the other end of the pressure relief valve seat (24) in a manner that allows it to move and adjust along the axial direction of the spring (33). When the stop cover (34) is adjusted to move along the axial direction of the spring (33), the stop cover (34) is used to control the degree of compression of the spring (33) to change the opening pressure of the valve core assembly.

4. The water heating assembly of the instant electric water heater according to claim 3, characterized in that: The blocking cover (34) is arranged on the inner side of the other end of the pressure relief valve seat (24) and is threadedly connected to the inner wall of the pressure relief valve seat (24).

5. The water heating assembly of the instant electric water heater according to claim 4, characterized in that: A second annular step (29) is provided on the inner side of the other end of the pressure relief valve seat (24) for abutting against the inner end of the stop cover (34). When the stop cover (34) is adjusted to move the stop cover (34) along the axial direction of the spring (33), the second annular step (29) is used to control the inward movement stroke of the stop cover (34) and to control the degree of compression of the spring (33) by the stop cover (34) to control the maximum opening pressure of the valve core assembly.

6. The water heating assembly of the instant electric water heater according to claim 5, characterized in that: A regular hexagonal countersunk hole (341) is provided in the middle of the outer end of the blocking cover (34), and the countersunk hole (341) is used to cooperate with the end of an external hexagonal wrench to facilitate the external hexagonal wrench to screw the blocking cover (34).

7. The water heating assembly of the instant electric water heater according to any one of claims 1 to 6, characterized in that: The electric heating component (1) comprises an end cover (11) and at least one U-shaped electric heating tube (12); the electric heating tube (12) is inserted into the inner cavity (21) from top to bottom; both conductive ends of the electric heating tube (12) penetrate the end cover (11) from bottom to top and then extend out of the end cover (11); each conductive end of the electric heating tube (12) is fixed to the end cover (11) by welding and circumferentially sealed; the end cover (11) is fixed to the upper end of the heating chamber (2) and circumferentially sealed.

8. The water heating assembly of the instant electric water heater according to claim 7, characterized in that: A third annular step (20) is arranged on the inner side of the upper end of the heating tank (2), the outer edge of the end cover (11) is supported on the third annular step (20), a sealing gasket is embedded between the outer edge of the end cover (11) and the third annular step (20), and the water heating component also includes a pressing ring (4), the pressing ring (4) is arranged above the end cover (11), the pressing ring (4) is fixed to the upper end of the heating tank (2) and is used to press the end cover (11) and the sealing gasket onto the third annular step (20).

9. The water heating assembly of the instant electric water heater according to claim 7, characterized in that: Two electric heating tubes (12) are provided, and the two electric heating tubes (12) are inserted into the inner cavity (21) at an interval, one conductive end of each electric heating tube (12) is electrically connected to one conductive end of another electric heating tube (12) through a first conductive sheet (13), and the other conductive end of each electric heating tube (12) is electrically connected to the other conductive end of another electric heating tube (12) through a second conductive sheet (14), and the two electric heating tubes (12) are connected in parallel through the first conductive sheet (13) and the second conductive sheet (14).

10. The water heating assembly of the instant electric water heater according to claim 1, characterized in that: The heating vessel (2) is made of plastic material.

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