A heating assembly

Abstract

The application belongs to the technical field of heating equipment and discloses a heating assembly. The heating assembly comprises a heating mechanism, a water inlet structure and a water outlet structure. The heating mechanism comprises a heating outer assembly and a heating inner assembly sleeved in the heating outer assembly, and a heating cavity is formed between the heating outer assembly and the heating inner assembly. The water inlet structure is arranged at the end of the heating outer assembly and communicates with the heating cavity. The water outlet structure is arranged at the other end and is provided with a water outlet channel. A transition channel is arranged on the water outlet structure and / or the heating inner assembly, and the transition channel communicates the heating cavity with the water outlet channel. A piston is sealingly and slidingly connected in the heating inner assembly and is arranged opposite to the water outlet channel. The extension limit position of the piston in the heating inner assembly is axially staggered with the transition channel. An elastic member is arranged between the heating inner assembly and the piston. When the water outlet channel stops water outlet, the water pressure in the water outlet channel rises, and the water flow extrudes the piston, so that the piston is retracted in the heating inner assembly to form a temporary water storage space. The application can effectively avoid scale caused by residual heat and prevent users from being scalded when the water outlet is turned on again.

Description

Technical Field

[0001] This invention relates to a heating component, belonging to the technical field of heating equipment. Background Technology

[0002] The heating element, especially the heating element used in instant water heaters, is the core component of the water heater. The process of heating water is generally as follows: the user turns on the water heater, at which point the heating element starts to operate. Tap water, that is, room temperature water or cold water, first enters the heating mechanism of the heating element through the inlet pipe and is heated. The heated water then flows out through the outlet pipe.

[0003] Existing heating components have the following drawbacks during use: When the user turns off the machine, that is, when the heating element stops running, the heating mechanism still retains the heat from the previous heating operation. This residual heat will cause the tap water remaining in the heating mechanism to continue to heat up. This continuous heating will cause the water temperature to eventually exceed the temperature at which scale forms, resulting in a problem of easy scaling. On the other hand, when the user turns the machine back on and the water comes out, the hot water will rush out from the water outlet pipe, which may cause scalding. Summary of the Invention

[0004] The present invention aims to provide a heating component that solves the problem that existing heating components, when shut down, cause residual heat to continuously heat the tap water remaining inside, resulting in easy scaling and the risk of scalding when the water is turned on again.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A heating assembly, comprising: A heating mechanism includes an outer heating component, an inner heating component is sleeved inside the outer heating component, and a heating cavity is formed between the inner wall of the outer heating component and the outer wall of the inner heating component; A water inlet structure is located at the end of the heating outer component and communicates with the heating cavity; The water outlet structure and the water inlet structure are respectively located at both ends of the heating outer component. The water outlet structure is sealed to the end of the heating outer component, and the water outlet structure is provided with a water outlet channel. A transition channel is provided on the water outlet structure and / or the heating internal component. The transition channel intersects with the water outlet channel. The water inlet structure, heating chamber, transition channel and water outlet channel are connected in sequence. A piston is sealed and slidably connected within the heating inner assembly. The piston is capable of extending and retracting within the heating inner assembly. The piston's extension limit position within the heating inner assembly is axially offset from the position of the transition channel. The piston is positioned directly opposite the water outlet channel. An elastic element, disposed within the heating inner assembly and between the heating inner assembly and the piston, is used to provide a spring force to reset the piston after it is compressed back.

[0006] When the external faucet is closed and the water flow stops, the static water pressure in the pipes instantly increases and acts on the piston end face. This pressure overcomes the elastic force of the elastic element, pushing the piston to retract away from the water flow channel. This dynamically creates a "temporary water storage space" inside the heating element. This space effectively accommodates hot water that continues to heat up due to the residual heat of the heating mechanism, preventing this water from being heated to the scaling temperature (usually above 60°C) in the sealed cavity. This significantly reduces the risk of scale formation and extends the service life of the heating element. Simultaneously, when the user turns on the faucet again, the warm water stored in this space mixes with the newly entered cold water and the subsequent hot water flow, effectively preventing the instantaneous spraying of high-temperature steam or excessively hot water upon startup. This improves user safety and avoids scalding accidents.

[0007] Furthermore, the piston is located at its extension limit position within the heating inner assembly, and the elastic force of the elastic element is preset such that when the water pressure in the water outlet channel is lower than a first preset pressure value, the piston can be pushed by the elastic force and held at the extension limit position.

[0008] Furthermore, the heating assembly also includes a blocking structure disposed between the inner heating assembly and the water outlet structure, which is used to prevent the piston from extending out of the inner heating assembly and into the water outlet channel, while the piston's extension limit position is axially offset from the position of the transition channel.

[0009] Furthermore, the heating inner assembly is provided with a limiting structure, which is disposed on the path of the piston retracting within the heating inner assembly, and is used to limit the retraction limit position of the piston within the heating inner assembly.

[0010] Furthermore, the blocking structure is a plate-shaped structure, which is fixed inside the water outlet channel and abuts against the end of the piston at the extended limit position.

[0011] Furthermore, the limiting structure is a limiting sleeve, the piston includes a piston head and a piston rod fixed to each other, the piston rod is sleeved inside the limiting sleeve, the piston head is located outside the limiting sleeve and its outer diameter is greater than or equal to the inner diameter of the limiting sleeve; the elastic element is sleeved on the piston rod, one end of the elastic element extends into the limiting sleeve and is connected thereto, and the other end is connected to the piston head.

[0012] Furthermore, the piston is provided with a Y-shaped sealing ring for sealing connection with the heating inner component, and the lip of the Y-shaped sealing ring faces the side where the water outlet channel is located.

[0013] Furthermore, the heating chamber is provided with a spiral structure so that the water flows in a spiral pattern after entering the heating chamber.

[0014] Furthermore, the heating assembly also includes a housing and a water-cooling pipe disposed within the housing. The heating mechanism is installed inside the housing, and the water inlet structure and the water outlet structure are respectively fixed at both ends of the housing. The water-cooling pipe is connected to the water inlet structure.

[0015] Furthermore, the heating outer assembly includes a heating outer tube and a heating wire wound on the heating outer tube, the heating inner assembly includes a heating inner tube sleeved inside the heating outer tube, the water inlet structure and the water outlet structure are respectively sealed to both ends of the heating outer tube, the end of the limiting structure is respectively connected to the heating outer tube and the heating inner tube to close the end of the heating cavity and the end of the heating inner tube, the end of the limiting structure is provided with a gap channel, and the water inlet structure communicates with the heating cavity through the gap channel.

[0016] Compared with the prior art, the present invention has the following advantages: 1. This invention utilizes a piston that is sealed and slidably installed within the heating internal assembly, and is reset with an elastic element. When water flow stops, the sudden increase in water pressure in the outlet channel pushes the piston to overcome the elastic force of the elastic element and retract, thereby forming a temporary water storage space within the heating internal assembly. This allows residual hot water that was originally present in the outlet channel and near the heating chamber outlet to enter and be stored in this temporary water storage space. This avoids the residual heat of the heating mechanism continuously heating the stagnant water to the scaling temperature during the water shut-off period, solving the problem of easy scaling after the existing heating components stop operating. At the same time, when hot water is released again upon restarting, the warm water accumulated in the temporary water storage space mixes with the water flowing out of the subsequent heating chamber, avoiding the instantaneous spraying of extremely high-temperature hot water and solving the safety hazard of being scalded by boiling water. It also speeds up the hot water output during restarting, shortens the time users wait for the hot water to heat up, and improves the smoothness of the adaptive adjustment of the outlet water temperature.

[0017] 2. This invention applies a "bidirectional limit" to the reciprocating movement path of the piston by setting a blocking structure in the water outlet channel and a limiting structure in the heating inner tube. On the one hand, it prevents the piston from extending too far and sliding into the transition channel, causing local sealing failure or blockage of the flow channel. On the other hand, it prevents the elastic element from being over-compressed and damaged, ensuring that the stroke of the piston in the internal reciprocating movement is accurately controllable and extending the service life of the transmission structure.

[0018] 3. By setting a spiral structure, such as a spiral spring, inside the heating chamber, the water flow changes from axial laminar flow to spiral swirling flow after entering the heating chamber. This extends the heat exchange path of tap water in the heating chamber, not only increasing the effective heat exchange area, but also breaking the laminar boundary layer to enhance convective heat transfer, thereby significantly improving the heat exchange efficiency and instantaneous heating performance of the heating mechanism.

[0019] 4. This invention, by attaching a water-cooling pipe connected to the water inlet structure to the inner wall of the housing, allows the cold water to be heated to flow through the inner wall of the housing before entering the heating mechanism. On the one hand, this absorbs the waste heat radiated outward from the heating mechanism through the housing, achieving a good preheating effect and reducing heating energy consumption; on the other hand, it absorbs the heat from the housing, achieving a cooling and anti-scalding effect, and improving the safety of the entire machine operation.

[0020] 5. This invention, by configuring a Y-shaped sealing ring on the piston and setting its lip towards the water outlet channel, ensures that when the water pressure in the water outlet channel increases and squeezes the piston, the high-pressure water flow will spontaneously squeeze the lip of the Y-shaped sealing ring, causing the lip to expand to both sides and fit more tightly against the inner wall of the heating inner tube. This achieves a self-tightening sealing effect of "the greater the water pressure, the tighter the seal," ensuring long-term sealing reliability under high-frequency piston expansion and contraction. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of the present invention; Figure 2 This is a perspective view of a partial structure of one embodiment of the present invention; Figure 3 This is a three-dimensional sectional view of an embodiment of the present invention; Figure 4 This is a cross-sectional view of a partial structure according to an embodiment of the present invention; Figure 5 This is an exploded view of a partial structure of an embodiment of the present invention from a first perspective; Figure 6 This is an exploded view from a second perspective of a partial structure of an embodiment of the present invention.

[0022] The serial numbers in the diagram are as follows: 1. Shell; 2 ~ Water cooling pipes; 3 – Heating mechanism; 31 – Outer heating tube; 32 – Heating wire; 33 – Connector; 34 – Inner heating tube; 35 – Heating chamber; 4 – Water inlet structure; 41 – Water flow channel; 5 – Water outlet structure; 51 – Tubular protrusion; 52 – Transition channel; 53 – Water outlet channel; 54 – Barrier structure; 6 – Limiting structure; 61 – Closed end; 62 – Gap channel; 63 – Circular protrusion; 64 – Notch; 7 – Piston; 71 – Piston head; 72 – Piston rod; 8 - Elastic element; 9 - Y-type sealing ring; 10 - Helical spring; 11 - Water inlet pipe; 12 - Water outlet pipe; 13 - Sealing ring. Detailed Implementation

[0023] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings to further illustrate the technical solutions of the present invention. However, the present invention is not limited to these embodiments.

[0024] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0025] See Figures 1 to 6 This embodiment provides a heating assembly applicable to instantaneous water heaters. The heating assembly includes a housing 1, a water-cooled pipe 2, a heating mechanism 3, a water inlet structure 4, a water outlet structure 5, a limiting structure 6, a piston 7, and an elastic element 8. The water-cooled pipe 2 and the heating mechanism 3 are both installed inside the housing 1. The water inlet structure 4 and the water outlet structure 5 are respectively fixed to both ends of the housing 1 by bolts. One end of the water-cooled pipe 2 is connected to the water inlet structure 4, and the other end is used to receive tap water, i.e., room temperature water or cold water. The heating mechanism 3 includes an outer heating assembly and an inner heating assembly fitted inside the outer heating assembly. The outer heating assembly includes an outer heating tube 31 and a heating wire 32 wound around the outer heating tube 31. The inner heating assembly includes an inner heating tube 34 coaxially fitted inside the outer heating tube 31. Both the outer heating tube 31 and the inner heating tube 34 are circular tubes, forming a heating cavity 35 between them. The heating cavity 35 is an annular cavity. The water inlet structure 4 and the water outlet structure 5 are respectively sealed to both ends of the outer heating tube 31 by sealing rings 13. The water outlet structure 5 is provided with a transition channel 52 and a water outlet channel 53 that intersect each other. The transition channel 52 is a radially arranged hole, and the water outlet channel 53 is an axially arranged cylindrical cavity. The water outlet channel 53 is perpendicularly connected to the transition channel 52. The water outlet channel 53 is directly opposite to the piston 7. The water inlet structure 4, the heating chamber 35, the transition channel 52 and the water outlet channel 53 are connected in sequence.

[0026] See Figures 3 to 6The limiting structure 6 is coaxially installed inside the heating inner tube 34. The end of the limiting structure 6 is sealed to the heating inner tube 34 and abuts against the inner wall of the heating outer tube 31. Specifically, the limiting structure 6 has a closed end 61, which is sealed to the end of the heating inner tube 34 by a sealing ring 13 to close the end of the heating inner tube 34. At the same time, the closed end 61 also abuts against the inner wall of the heating outer tube 31 circumferentially to close the end of the heating cavity 35. The closed end 61 has a plurality of slit channels 62 evenly distributed circumferentially, communicating with the annular heating cavity 35. The water inlet structure 4 communicates with the heating cavity 35 through the slit channels 62. In this embodiment, the limiting structure 6 is a cylindrical limiting sleeve, which includes a cylindrical body and a closed end 61. In order to ensure structural strength and facilitate manufacturing, the two are integrally formed. The cylindrical body is cylindrical and is coaxially disposed inside the heating inner tube 34. The closed end 61 is located at one end of the cylinder body. The diameter of the closed end 61 is larger than the diameter of the cylinder body. The closed end 61 is a circular plate or cylindrical block structure that abuts against the end of the heating inner tube 34 axially. The gap channel 62 is an arc-shaped, circular, or U-shaped hole opened at the circumferential edge of the circular plate or cylindrical block structure. A circular protrusion 63 extends from the middle of the circular plate or cylindrical block structure. The circular protrusion 63 is used to snap and fix with the water inlet structure 4. The middle of the circular protrusion 63 is a cavity to communicate with the water inlet structure 4. Several arc-shaped, circular, or U-shaped notches 64 are evenly distributed around the circumference of the circular protrusion 63. The notches 64 are used to connect the cavity, i.e., the water inlet structure 4, with the gap channel 62.

[0027] The piston 7 is sealed and slidably connected within the heating inner tube 34. The piston 7 can extend and retract within the heating inner tube 34, and its retraction limit within the heating inner tube 34 is determined by the limiting structure 6. The piston 7 can only extend and retract within the heating inner tube 34; it cannot extend beyond the heating inner tube 34 to avoid passing through the transition channel 52 or entering the water outlet channel 53, thereby preventing water flow from damaging the seal between the piston 7 and the heating inner tube 34. The piston 7 and the water outlet channel 53 are positioned opposite each other. In this embodiment, the piston 7 consists of a coaxial and integrally formed piston head 71 and piston rod 72, both being cylindrical structures with different diameters and lengths. The piston rod 72 is sleeved within the limiting sleeve. The piston head 71 is located outside the limiting sleeve, and its outer diameter is greater than or equal to the inner diameter of the limiting sleeve, so that the piston 7 can be limited by the end of the limiting sleeve. The piston head 71 is provided with a Y-shaped sealing ring 9 to seal and connect with the heating inner tube 34. The lip of the Y-shaped sealing ring 9 faces the side where the water outlet channel 53 is located. In this way, the characteristics of the Y-shaped sealing ring 9 can be utilized. When the water pressure in the water outlet channel 53 is greater, the sealing effect between the piston head 71 and the heating inner tube 34 is better.

[0028] The elastic element 8 is a spring, which is sleeved on the piston 7. One end of the elastic element 8 is connected to the limiting structure 6, and the other end is connected to the piston 7. Specifically, the elastic element 8 is sleeved on the piston rod 72. One end of the elastic element 8 extends into the limiting sleeve and is engaged, welded, or abutted thereto, while the other end is engaged, welded, or abutted to the piston head 71. The elastic element 8 can cause the piston 7 to retract and return to its original position. The elastic element 8 can control the piston 7's extension limit position within the heating inner assembly. That is, the maximum return force of the elastic element 8 is the force that drives the piston 7 to slide to the extension limit position inside the heating inner tube 34, or the elastic force of the elastic element 8 is preset so that when the water pressure in the water outlet channel 53 is lower than a first preset pressure value, the piston 7 can be pushed by the elastic force and held in the extension limit position.

[0029] See Figure 1 and Figure 2 The housing 1 is made of stainless steel to facilitate heat dissipation. Several connectors 33 are axially mounted on the housing 1, electrically connected to the heating wire 32, facilitating the energization of the heating wire 32 to heat the water in the heating chamber 35. The water-cooling pipe 2 is made of metal to facilitate heat dissipation; its outer wall is also fitted against the inner wall of the housing 1 to further enhance heat dissipation capacity, facilitating the absorption of heat generated by the heating mechanism 3 and thus cooling the housing 1. See also... Figures 3 to 6 The water outlet structure 5 is a single plate-like structure with a tubular protrusion 51 in the middle. A ring-shaped groove surrounds the protrusion 51 for installing a sealing ring 13 to seal the connection with the end of the heating outer tube 31. The water outlet channel 53 is located inside the tubular protrusion 51, and a transition channel 52 is radially formed on the protrusion 51. The water-cooling pipe 2 connects to the inlet pipe 11, and the water outlet channel 53 connects to the outlet pipe 12, which in turn connects to the faucet outside the water heater. Both the inlet pipe 11 and the outlet pipe 12 are integrated into the water outlet structure 5 for structural simplification and ease of manufacturing. The water inlet structure 4 is also a single plate-like structure with a ring-shaped groove inside for installing a sealing ring 13 to seal the connection with the other end of the heating outer tube 31. The water inlet structure 4 has a water flow channel 41 for connecting to the water-cooling pipe 2 and the slit channel 62, respectively.

[0030] See Figures 3 to 6A blocking structure 54 is integrally fixed within the water outlet chamber of the water outlet structure 5. This blocking structure prevents the piston 7 from extending out of the heating inner tube 34 and into the water outlet channel 53. It limits the extension limit position of the piston 7 and ensures that the extension limit position of the piston 7 is axially offset from the position of the transition channel 52 to guarantee structural sealing. The blocking structure 54 is a plate-like structure, circumferentially equidistantly distributed within the water outlet channel 53. The plate-like structure abuts against the end of the piston 7 at its extension limit position (i.e., under normal water outlet conditions). The piston 7 only extends and retracts within the heating inner tube 34, or ensures that the extension limit position of the piston 7 is axially offset from the position of the transition channel 52. This is achieved by the elastic element 8 (with specifications such as elasticity or length) and / or the blocking structure 54.

[0031] In this embodiment, the heating chamber 35 is provided with a spiral structure so that water flows in a spiral pattern after entering the heating chamber 35. See also Figures 3 to 6 The spiral structure uses a spiral spring 10. The radial ends of the spiral spring 10 are tightly fitted to the inner wall of the heating chamber 35. That is, the radial ends of the spiral spring 10 are tightly fitted to the inner wall of the outer heating tube 31 and the outer wall of the inner heating tube 34, respectively. In this way, when water enters the heating chamber 35, it can flow in a spiral manner, avoiding laminar flow. This is equivalent to extending the heat exchange path or area of ​​the water and improving the heat exchange efficiency.

[0032] In some embodiments, the transition channel 52 may not be provided on the water outlet structure 5, but rather on the heating inner tube 34. In this case, the transition channel 52 is a radial hole in the heating inner tube 34, equidistantly distributed around the circumference of the heating inner tube 34, and the hole may be a circular hole. Alternatively, the transition channel 52 may be provided on both the water outlet structure 5 and the heating inner tube 34. In this case, the transition channel 52 is formed by combining one half of the hole located radially at the end of the water outlet structure 5 and the other half of the hole located radially at the end of the heating inner tube 34, and the combined hole may be a circular hole.

[0033] The principle of this invention is as follows: During normal water flow, tap water enters the water-cooling pipe 2 from the inlet pipe 11, then enters the water inlet structure 4 from the water-cooling pipe 2, and enters the heating chamber 35 of the heating mechanism 3 through the slit channel 62. After flowing and being heated in the heating chamber 35, the hot water enters the outlet channel 53 from the transition channel 52, and then flows out through the outlet pipe 12. At this time, there is almost no pressure at the outlet channel 53, so the piston 7 will not be squeezed. When the water is turned off, that is, when the outlet pipe 12 stops flowing water, the water pressure in the outlet channel 53 will rise to the inlet pressure of the tap water, thereby squeezing the piston 7. This causes the piston 7 to retract inside the heating inner tube 34 and form a temporary water storage space. The high-temperature hot water that was originally located in the outlet channel 53 will enter this temporary water storage space for temporary storage.

[0034] Because the water in the outlet channel 53 needs to overcome the elastic force of the elastic element 8 and squeeze the piston 7, while tap water (cold water or room temperature water) is still entering, and the heating mechanism 3 cannot heat the tap water to above 55 degrees Celsius due to the residual heat after being turned off, even if there is residual heat, it can only heat the tap water to more than 40 degrees Celsius (which will not exceed the scale-forming threshold). Therefore, when the water is drained for the second time (the tap is turned on again), the high-temperature hot water in the temporary water storage space mixes with the cold or room temperature water flowing from the heating chamber 35 into the outlet channel 53, so that the water flushed out of the outlet pipe 12 will not scald people. At the same time, when the heating mechanism 3 reheats the tap water, it can reach the set temperature more quickly, saving the waiting time for hot water to be heated.

[0035] At the moment of shutdown (water shut-off), the pipes of the casing 1 and heating mechanism 3 are heated. If there is no piston 7, the water in the original water outlet channel 53 will continue to heat up, exceeding 60 degrees Celsius, which is above the temperature for scaling. This will cause scaling problems. Furthermore, when the machine is turned on again, there is a risk that hot water will rush out from the water outlet pipe 12 and scald people.

[0036] The embodiments of the present invention have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention is not limited to the specific embodiments described above; these embodiments are merely illustrative and not limiting. Those skilled in the art, under the guidance of the present invention, can make many modifications without departing from the spirit and scope of the claims, and all such modifications fall within the scope of protection of the present invention.

Claims

1. A heating assembly, characterized in that, include: Heating mechanism (3) includes an outer heating component, an inner heating component is sleeved inside the outer heating component, and a heating cavity (35) is formed between the inner wall of the outer heating component and the outer wall of the inner heating component. A water inlet structure (4) is located at the end of the heating outer component and communicates with the heating cavity (35); The water outlet structure (5) and the water inlet structure (4) are respectively located at both ends of the heating external component. The water outlet structure (5) is sealed to the end of the heating external component. The water outlet structure (5) is provided with a water outlet channel (53). A transition channel (52) is provided on the water outlet structure (5) and / or the heating internal component. The transition channel (52) intersects with the water outlet channel (53). The water inlet structure (4), heating chamber (35), transition channel (52) and water outlet channel (53) are connected in sequence. The piston (7) is sealed and slidably connected within the heating inner assembly. The piston (7) is able to extend and retract within the heating inner assembly. The piston (7) at its extension limit position within the heating inner assembly is axially offset from the position of the transition channel (52). The piston (7) is directly opposite to the water outlet channel (53). An elastic element (8), which is disposed within the heating inner assembly and between the heating inner assembly and the piston (7), is used to provide an elastic force to reset the piston (7) after it is compressed back.

2. The heating assembly according to claim 1, characterized in that, The piston (7) is located in the heating inner assembly at its extension limit position. The elastic force of the elastic member (8) is preset so that when the water pressure in the water outlet channel (53) is lower than the first preset pressure value, the piston (7) can be pushed by the elastic force and kept in the extension limit position.

3. The heating assembly according to claim 1, characterized in that, It also includes a blocking structure (54), which is located between the heating inner component and the water outlet structure (5) to prevent the piston (7) from extending out of the heating inner component and into the water outlet channel (53), while making the extension limit position of the piston (7) axially offset from the position of the transition channel (52).

4. The heating assembly according to claim 1, characterized in that, The heating inner assembly is provided with a limiting structure (6), which is disposed on the path of the piston (7) retracting within the heating inner assembly, and is used to limit the retraction limit position of the piston (7) within the heating inner assembly.

5. The heating assembly according to claim 3, characterized in that, The blocking structure (54) is a plate-shaped structure, which is fixed inside the water outlet channel (53) and abuts against the end of the piston (7) at the extended limit position.

6. The heating assembly according to claim 4, characterized in that, The limiting structure (6) is a limiting sleeve. The piston (7) includes a piston head (71) and a piston rod (72) fixed to each other. The piston rod (72) is sleeved inside the limiting sleeve. The piston head (71) is located outside the limiting sleeve and its outer diameter is greater than or equal to the inner diameter of the limiting sleeve. The elastic element (8) is sleeved on the piston rod (72). One end of the elastic element (8) extends into the limiting sleeve and is connected to it, and the other end is connected to the piston head (71).

7. The heating assembly according to claim 1, characterized in that, The piston (7) is provided with a Y-shaped sealing ring (9) to seal and connect with the heating inner component, and the lip of the Y-shaped sealing ring (9) faces the side where the water outlet channel (53) is located.

8. The heating assembly according to claim 1, characterized in that, The heating chamber (35) is provided with a spiral structure so that water flows in a spiral after entering the heating chamber (35).

9. The heating assembly according to any one of claims 1 to 8, characterized in that, It also includes a housing (1) and a water-cooling pipe (2) disposed in the housing (1). The heating mechanism (3) is installed in the housing (1). The water inlet structure (4) and the water outlet structure (5) are respectively fixed at both ends of the housing (1). The water-cooling pipe (2) is connected to the water inlet structure (4).

10. The heating assembly according to claim 4, characterized in that, The heating outer component includes a heating outer tube (31) and a heating wire (32) wound on the heating outer tube (31). The heating inner component includes a heating inner tube (34) sleeved inside the heating outer tube (31). The water inlet structure (4) and the water outlet structure (5) are respectively sealed to both ends of the heating outer tube (31). The end of the limiting structure (6) is respectively connected to the heating outer tube (31) and the heating inner tube (34) to close the end of the heating cavity (35) and the end of the heating inner tube (34). The end of the limiting structure (6) is provided with a gap channel (62). The water inlet structure (4) communicates with the heating cavity (35) through the gap channel (62).

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