Steam generating device, garment steamer

Abstract

This invention relates to the fields of fluid thermal engineering and household appliances, and discloses a steam generating device and a steam garment steamer. The steam generating device includes: a heating body and a top cover with a sealing cap; the top cover has a water inlet and a steam outlet; the heating body has a heating tube embedded in its bottom and a vaporization channel integrally formed on its top, which is divided into an initiation section, a retention section, and a termination section, with the heating tube correspondingly arranged in the area below the vaporization channel; the initiation section corresponds to the water inlet and has an inclined slope for fluid acceleration; the retention section adopts a smooth circular arc structure and has a Tesla valve microstructure with no moving parts for unidirectional fluid flow on part of its sidewalls; the termination section corresponds to the steam outlet and has a funnel-shaped micro cyclone separation chamber. This invention has a reasonable structural layout, high heat exchange efficiency, and stable steam output, effectively avoiding water spraying problems.

Description

Technical Field

[0001] This invention relates to the fields of fluid thermal engineering and household appliances, specifically to a steam generating device and a steam garment steamer. Background Technology

[0002] In existing technologies, the heating element of garment steamers typically employs a conventional labyrinthine flow channel of equal width, coupled with a bottom heating element for heating. However, this traditional structure still suffers from numerous shortcomings in terms of fluid dynamics and thermodynamics during practical use. First, there is no initial acceleration structure when the fluid enters the flow channel, and cold water is prone to accumulate and stagnate at the inlet, resulting in localized sudden cooling, which causes water vaporization to be delayed and the steam output response speed to be slow.

[0003] Secondly, traditional flow channels often adopt a right-angle reversal layout, resulting in a rigid flow path that easily generates dead zones and local eddy resistance. Incompletely vaporized droplets in the flow field cannot effectively adhere to the high-temperature wall surface for sufficient heat exchange, leading to low thermal energy utilization and poor heat exchange matching.

[0004] Furthermore, during the high-temperature flash evaporation process, steam is prone to generating high-pressure shock waves, which can easily backflow towards the water inlet, causing the steam output to fluctuate greatly and resulting in severe steam pulsation.

[0005] In addition, conventional flow channels rely solely on natural convection heat transfer from the planar wall surface, resulting in a limited heat transfer coefficient and a long delay in the heating of liquid water. Furthermore, the flow channel lacks a dedicated vapor-water separation structure at its end, making it easy for high-speed steam to carry large, incompletely vaporized droplets directly out. This not only easily wets clothing but also poses a safety hazard of burns from high-temperature droplets.

[0006] Therefore, developing a new type of steam generator that can achieve autonomous fluid acceleration, prevent backflow of steam, enhance heat exchange efficiency, and has its own steam-water separation is a technical problem that the industry urgently needs to solve. Summary of the Invention

[0007] To address the aforementioned problems, embodiments of the present invention provide a steam generating device and a steam garment steamer. By optimizing the vaporization flow channel into starting, stagnant, and ending sections, and integrating proprietary structures such as a Tesla valve microstructure, a hemispherical micro-dimple structure, a micro-cyclone separation chamber, an energy-concentrating flash evaporation cavity, a micro-needle fin array, and a heat-insulating buffer chamber, the device achieves active control of fluid motion, efficient heat exchange, and precise gas-liquid separation, preventing steam pulsation and backflow, and significantly improving steam vaporization efficiency and steam output stability.

[0008] The embodiments of the present invention adopt the following technical solutions: In a first aspect, the present invention provides a steam generating device, comprising: a heating body and a top cover that is sealed to the top of the heating body; The top cover has a water inlet and a steam outlet; A heating tube is embedded and fixed in the bottom solid of the heating body, and the two connecting ends of the heating tube are led out from the side of the heating body; The top of the heating body is integrally formed with a vaporization channel, which includes a starting section, a retention section and a termination section. The heating tubes are arranged in the area below the vaporization channel. The starting section corresponds to the inlet and has an inclined slope to accelerate the fluid. The retention section adopts a smooth, circumferential arc structure. Part of the sidewall of the retention section has a Tesla valve microstructure with no moving parts and unidirectional fluid flow. The Tesla valve microstructure includes multiple branch loops arranged sequentially along the flow direction. The terminating section corresponds to the steam outlet and includes a funnel-shaped micro cyclone separator.

[0009] Optionally, the bottom of the top cover is provided with an omnidirectional nozzle with an array of atomizing holes corresponding to the water inlet.

[0010] Optionally, the heating element has a multi-bend curved structure.

[0011] Optionally, the bottom array of the starting segment and the retention segment is arranged with hemispherical micro-pit structures.

[0012] Optionally, the termination section also includes a focused flash evaporation chamber, the top of which is connected to the bottom of the micro cyclone separation chamber.

[0013] Optionally, the bottom of the energy-concentrating flash evaporation cavity has a high-density microneedle fin array.

[0014] Optionally, the starting segment and the ending segment are arranged adjacent to each other, and a heat insulation buffer cavity is provided between the heating body of the starting segment and the ending segment.

[0015] Optionally, the heat insulation buffer cavity can be a closed air cavity or a semi-closed air cavity.

[0016] Optionally, a sealing ring is provided between the mating surfaces of the top cover and the heating body, and the top cover and the heating body are fastened together by bolts.

[0017] Secondly, the present invention also provides a steam garment steamer, including the aforementioned steam generating device.

[0018] This invention provides a steam generating device that can achieve the following beneficial effects: The present invention sets an inclined slope structure at the beginning section of the vaporization channel, which can use gravitational potential energy to give the inflowing fluid initial kinetic energy, accelerate the fluid flow rate, avoid fluid accumulation and stagnation at the inlet, eliminate local rapid cooling phenomenon, and improve the steam output response speed.

[0019] The retention section adopts a smooth, circular arc structure to replace the traditional right-angle reversing flow channel, eliminating dead zones and local eddy current resistance, and extending the fluid heat exchange trajectory. At the same time, a Tesla valve microstructure with no moving parts and unidirectional fluid flow is set on the side wall of the retention section. It achieves unidirectional flow by relying on pure geometric fluid dynamics characteristics, effectively blocking the backflow of high-pressure airflow generated by steam flashing and eliminating steam pulsation problems.

[0020] An array of hemispherical micro-pit structures is set at the bottom of the initial and stagnant sections. This can induce internal secondary vortices when the fluid flows through, effectively stripping the thermal boundary layer near the wall. Without significantly increasing the flow channel resistance, this greatly enhances the gas-liquid two-way convective heat transfer, shortens the liquid water heating delay time, and improves thermal energy utilization.

[0021] The terminal section integrates a funnel-shaped micro cyclone separation chamber and a energy-concentrating flash evaporation cavity, combined with a high-density micro needle fin array at the bottom, which can achieve efficient gas-liquid centrifugal separation. The unvaporized droplets gather and then undergo secondary heat absorption and boiling, which greatly improves the dryness of the steam and avoids problems such as steam carrying water and spraying water, wetting clothes, and high-temperature burns.

[0022] A thermal insulation buffer chamber is set between the starting section and the ending section. The low thermal conductivity of air forms a thermal resistance barrier, which effectively blocks the heat conduction between the low temperature water inlet and the high temperature steam end, avoids thermal short circuit, and ensures stable outlet steam temperature.

[0023] The entire assembly uses a top cover and heating body bolted together with a sealing ring for sealing. It has a compact structure and strong sealing performance. The heating tube is embedded and hidden, which has high thermal conductivity and a stable structure. It is easy to assemble and maintain, and is suitable for mass production and long-term use. Attached Figure Description

[0024] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings: Figure 1 A three-dimensional structural diagram of the overall assembly of a steam generator according to an embodiment of the present invention is shown; Figure 2 A top perspective view of the overall assembly of a steam generator according to an embodiment of the present invention is shown; Figure 3 A schematic diagram of the structure of the bottom of the top cover according to an embodiment of the present invention is shown; Figure 4 A three-dimensional structural schematic diagram of a heating tube according to an embodiment of the present invention is shown; Figure 5 A three-dimensional structural schematic diagram of the heating body according to an embodiment of the present invention is shown; Figure 6A top view schematic diagram of a heating body according to an embodiment of the present invention is shown; Figure 7 A schematic lateral cross-sectional view of the termination segment according to an embodiment of the present invention is shown; Figure 8 A three-dimensional structural schematic diagram of a microneedle fin array according to an embodiment of the present invention is shown; Among them, 1-top cover, 11-water inlet, 12-omnidirectional nozzle, 13-steam outlet, 2-heating body, 21-heating tube mounting groove, 22-vaporization channel, 221-starting section, 222-retention section, 223-terminating section, 23-Tesla valve microstructure, 24-micro-dimple structure, 25-micro cyclone separation chamber, 26-energy-concentrating flash evaporation cavity, 27-micro needle fin array, 28-heat insulation buffer chamber, 3-heating tube. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0026] This invention provides a steam generating device. Figure 1 This diagram shows the overall three-dimensional assembly structure of the steam generator. Figure 2 A top-view perspective diagram of the overall assembly of the steam generator is shown. (Refer to...) Figure 1 and Figure 2 As shown, the steam generating device includes: a heating body 2 and a top cover 1 that is sealed to the top of the heating body 2; The top cover 1 is provided with a water inlet 11 and a steam outlet 13; A heating tube 3 is embedded and fixed in the bottom solid of the heating body 2, and the two connecting ends of the heating tube 3 are led out from the side of the heating body 2; The top of the heating body 2 is integrally formed with a vaporization channel 22, which includes a starting section 221, a retention section 222 and a termination section 223. The heating tube 3 is correspondingly arranged in the area below the vaporization channel 22. The starting section 221 corresponds to the inlet 11, and the starting section 221 has an inclined slope to accelerate the fluid; The stagnation section 222 adopts a smooth structure with a circumferential arc. Part of the sidewall of the stagnation section 222 has a Tesla valve microstructure 23 with no moving parts and unidirectional fluid flow. The Tesla valve microstructure 23 includes multiple branch loops arranged sequentially along the flow direction. Termination section 223 corresponds to steam outlet 13 and includes a funnel-shaped micro cyclone separator 25.

[0027] Figure 3 A schematic diagram of the bottom structure of the top cover 1 is shown. (Refer to...) Figure 1 and Figure 3 As shown, the top cover 1 has a water inlet 11 for connecting to an external water source. Simultaneously, the top cover 1 also has a steam outlet 13 for delivering high-temperature steam. In some optional embodiments, an omnidirectional nozzle 12 with an array of atomizing holes is provided at the bottom of the top cover 1 corresponding to the water inlet 11.

[0028] An omnidirectional nozzle 12 is provided at the bottom of the top cover 1, and the omnidirectional nozzle 12 is connected to the water inlet 11. The omnidirectional nozzle 12 adopts an array of atomizing holes to disperse the water flow into a fine mist, thereby significantly increasing the spreading area of ​​the water in the initial section 221 of the vaporization channel 22. The atomizing holes of the omnidirectional nozzle 12 spray towards the inclined slope surface of the initial section 221.

[0029] The heating body 2, as the core cavity for steam generation, can be made of a metal material that is resistant to high temperatures and has good thermal conductivity. In this way, the heating body 2 can conduct heat quickly and withstand the high-temperature environment during the steam generation process.

[0030] A heating tube 3 is solidly embedded in the bottom of the heating body 2 as a heat source to provide energy for the heating and vaporization of the fluid. The two connecting ends of the heating tube 3 are led outward from the side of the heating body 2 to connect to an external power supply.

[0031] Figure 4 A three-dimensional structural schematic diagram of heating element 3 is shown. (Refer to...) Figure 4 In some optional embodiments, the heating tube 3 has a multi-bend curved structure and is arranged in the area below the vaporization channel 22.

[0032] The heating tube 3 can have an "M"-shaped bend structure. This multi-bend structure significantly increases the contact area between the heating tube 3 and the bottom solid of the heating body 2, creating a highly efficient and continuous heat conduction path. This allows the heat generated by the heating tube 3 to be quickly and evenly conducted to the heating body 2 and the vaporization channel 22, significantly improving heat conduction efficiency and the uniformity of the heat field distribution. Within the limited space of the heating body 2, the multi-bend structure can reasonably increase the effective heating length of the heating tube 3, increasing the heating power density and ensuring that the vaporization channel 22 receives sufficient heat, providing a stable heat source for the full vaporization of the fluid.

[0033] The bottom of the heating body 2 may have a heating tube mounting groove 21, into which the heating tube 3 is embedded. The heating tube mounting groove 21, except for two lead-out holes on the side of the heating body 2 for leading out the two connection ends of the heating tube 3, is otherwise a groove hidden within the bottom of the heating body 2. The heating tube 3 is tightly fixed in the heating tube mounting groove 21.

[0034] In order to ensure that the heating tube 3 is securely fixed in the heating tube mounting groove 21, it can be assembled in the following way.

[0035] Cutting: A base plate is cut from the bottom side of the heating body 2 (i.e., the side opposite to the vaporization channel 22) by machining. Alternatively, a base plate that matches the shape of the heating body 2 can be selected independently.

[0036] Grooving: An open groove is machined into the bottom side of the heating body 2 after the base plate is cut. The shape of the open groove matches the shape of the heating tube 3, and it is a multi-bend structure. Two outlet holes are made on the side of the heating body 2, connecting to the open groove. The open groove can completely accommodate the heating tube 3.

[0037] Embedding: The two connecting ends of the heating tube 3 are passed through the two lead-out holes, and the other part of the heating tube 3 is embedded in the open groove.

[0038] Sealing: The open groove is covered with a base plate and aligned with the heating body 2. The groove is fixed and sealed by welding or other means to form a relatively closed heating tube mounting groove 21, and the heating tube 3 is fixedly encapsulated in the heating tube mounting groove 21.

[0039] The advantage of this assembly method is that: Concealed encapsulation. The heating element 3 and the heating element mounting groove 21 are both enclosed within the bottom solid of the heating body 2 through the sealing of the base plate. Viewed from a bottom perspective of the heating body 2, the heating element 3 and the heating element mounting groove 21 are not directly visible, creating a flat and continuous solid surface at the bottom of the heating body 2. This improves the overall aesthetics of the device and avoids exposing the heating element 3, thus extending its service life.

[0040] Enhanced stability. Because the heating tube mounting groove 21 is a relatively closed cavity that constrains the heating tube 3, the stability of the heating tube 3 can be guaranteed even if it is not otherwise limited to the heating body 2. This ensures the stability and reliability of heat conduction.

[0041] Figure 5 A three-dimensional structural schematic diagram of the heating body 2 is shown. Figure 6 A top view of the heating element 2 is shown. (Refer to...) Figure 5 and Figure 6As shown, the top solid of the heating body 2 is integrally formed with a vaporization channel 22, which includes a starting section 221, a retention section 222 and a termination section 223.

[0042] The vaporization channel 22 is a continuous path that starts from the starting section 221, passes through the retention section 222, and ends at the ending section 223. The starting section 221 is used to receive water sprayed from the water inlet 11 of the top cover 1 at the corresponding position, the retention section 222 is used to vaporize the water into high-temperature steam, and the ending section 223 is used to send the high-temperature steam out through the steam outlet 13 of the top cover 1 at the corresponding position.

[0043] The starting section 221 corresponds to the inlet 11 (which may include an omnidirectional nozzle 12) and has an inclined slope to accelerate the fluid.

[0044] By using the inclined slope design, the gravitational potential energy can be used to give the newly injected water initial kinetic energy, so that it can quickly enter the path of the vaporization channel 22 and avoid accumulating in the initial section 221.

[0045] The retention section 222 adopts a smooth structure with a circumferential arc. Part of the sidewall of the retention section 222 has a Tesla valve microstructure 23 with unidirectional fluid flow without moving parts. The Tesla valve microstructure 23 includes multiple branch loops arranged sequentially along the flow direction.

[0046] The stagnation section 222 adopts a smooth, circular arc structure design, abandoning the traditional right-angle reversal structure. The flow channel transition is smooth and without abrupt corners. Compared with the traditional right-angle reversal labyrinth flow channel, the arc-shaped flow channel utilizes the centrifugal force generated by the fluid deflection motion to cause large, incompletely vaporized droplets to adhere to the outer high-temperature wall. At the same time, the smooth curve extends the continuous heat exchange trajectory, effectively eliminating the flow dead zone and local eddy resistance at right-angle turns, and achieving uniform matching between the flow field and the thermal field.

[0047] Steam garment steamers often experience fluctuating steam output during operation. This is due to the "flash steaming" that occurs when cold water contacts the high-temperature base plate. The resulting rapid expansion generates a localized high-pressure shock wave that not only pushes the outlet but also backflows towards the inlet, interfering with the continuous water intake at the inlet 11. To address this issue, a Tesla valve microstructure 23 with no moving parts and unidirectional fluid flow is integrally die-cast on part of the sidewall of the retention section 222. The Tesla valve microstructure 23 consists of multiple branch loops arranged sequentially along the flow direction, with the openings of the branch loops facing the liquid flow direction. When water is injected in the forward flow direction, the fluid flows smoothly through the vaporization channel 22. When a violent phase change occurs, generating a high-pressure reverse impact, the reverse airflow is forcibly guided into the lateral loop cavity and deflected 180 degrees, violently colliding with the subsequent reverse fluid to dissipate kinetic energy and creating significant reverse flow resistance. By relying purely on geometric fluid dynamics, the problems of water inlet pulsation and steam backflow are eliminated, preventing the potential failure of mechanical one-way valves due to scaling and jamming. When the ratio of the width of the branch loop to the width of the 222 flow channel in the retention section is optimized to around 0.5, the critical heat flux density can be increased by 48%, and the heat transfer efficiency is 9 times higher than that of ordinary flow channels.

[0048] In some alternative embodiments, the bottom of the starting segment 221 and the retention segment 222 are arranged with hemispherical micro-pit structures 24.

[0049] The micro-pit structure 24 is recessed towards the bottom. When the fluid flows through the micro-pit structure 24, it will undergo flow separation at the leading edge of the micro-pit, forming a secondary vortex inside the micro-pit and re-attaching at the trailing edge of the micro-pit. The surface of the micro-pit can increase the convective heat transfer coefficient by 1.5 times or even 2.5 times, thereby enhancing the heat transfer effect near the wall and improving the vaporization efficiency.

[0050] Figure 7 A schematic lateral cross-sectional view of the termination segment 223 is shown. Figure 8 A three-dimensional structural schematic diagram of the microneedle fin array 27 is shown. (Refer to...) Figure 7 and Figure 8 As shown, the termination section 223 corresponds to the steam outlet 13, and includes a funnel-shaped micro-cyclone separation chamber 25. In some alternative embodiments, the termination section 223 further includes a focusing flash evaporation cavity 26, the top of which is connected to the bottom of the micro-cyclone separation chamber 25. The bottom of the focusing flash evaporation cavity 26 has a high-density micro-needle fin array 27.

[0051] One of the core pain points of steam garment steamers is the "water spraying" problem. When the steam output increases dramatically, unvaporized, high-temperature water droplets are carried out by the high-speed steam, not only wetting clothes but also potentially causing burns. To ensure that the final output is high-quality dry steam, a funnel-shaped centrifugal micro-cyclone separator chamber 25 is designed.

[0052] The termination section 223 is designed as a funnel-shaped deep cavity, and the retention section 222 is connected to the tangential position on the side of the funnel-shaped deep cavity. The steam outlet 13 is located on the top cover 1 at the position corresponding to the funnel-shaped deep cavity. With this design, the generated hot steam can be smoothly ejected from the steam outlet 13.

[0053] When the liquid-carrying two-phase steam is injected tangentially at high speed into the micro cyclone separation chamber 25, it forms a strong centrifugal vortex field, achieving efficient physical separation by utilizing the density difference of approximately 1600 times between the gas and liquid. Large-mass droplets are thrown against the inner wall of the micro cyclone separation chamber 25 and slide down along gravity, while high-purity dry steam gathers towards the axis and is output through the steam outlet 13, fundamentally blocking the ejection path of unvaporized droplets.

[0054] The bottom of the micro cyclone separation chamber 25 is connected to the energy-concentrating flash evaporation cavity 26. A high-density micro needle fin array 27 is arranged at the bottom of the energy-concentrating flash evaporation cavity 26. The droplets that slide down the inner wall of the micro cyclone separation chamber 25 fall into the energy-concentrating flash evaporation cavity 26. After being enhanced by heat absorption by the micro needle fin array 27, they are completely vaporized again, so that pure dry steam is stably discharged from the steam outlet 13.

[0055] The dead corner at the root where the micro-needle array 27 meets the bottom surface becomes a perfect breeding ground for bubble generation. As bubbles grow and detach between the micro-needle array 27, the strong capillary force formed between the micro-needle array 27 rapidly draws surrounding liquid water to replenish the heated surface. This greatly delays localized drying and significantly increases the critical heat flux density (up to over 79% of that on smooth surfaces, or even several times). In two-phase flow, the micro-needle array 27 can pulverize large bubbles, causing them to break up and detach rapidly, thus improving the continuity of steam generation.

[0056] In some alternative embodiments, the starting segment 221 and the ending segment 223 are arranged adjacent to each other, and the heating body 2 between the starting segment 221 and the ending segment 223 is provided with a heat insulation buffer cavity 28.

[0057] Between the starting section 221 (i.e., the low-temperature cold water injection zone) and the ending section 223 (i.e., the high-temperature steam discharge zone), the heating body 2 has a heat-insulating buffer cavity 28 to reduce heat conduction. The heat-insulating buffer cavity 28 is an independent cavity structure from the starting section 221 and the ending section 223 and is not directly connected.

[0058] The heat-insulating buffer chamber 28 is an air-medium chamber. Utilizing the fact that air's thermal conductivity is much lower than that of metal, it physically cuts off or weakens the direct heat conduction path between the low-temperature cold water injection zone and the high-temperature steam discharge zone. This not only ensures that the steam remains at a high temperature but also prevents the water from absorbing heat too early and vaporizing prematurely, thus affecting its flow.

[0059] In some alternative embodiments, the heat insulation buffer cavity 28 is a closed air cavity or a semi-closed air cavity.

[0060] exist Figure 5 and Figure 6 In the case shown, the heat insulation buffer cavity 28 is a semi-enclosed air cavity, that is, the heat insulation buffer cavity 28 can be seen from the top view of the heating body 2.

[0061] The heat insulation buffer cavity 28 can also be a closed air cavity, that is, the heat insulation buffer cavity 28 cannot be directly seen from the top view of the heating body 2, and the heat insulation buffer cavity 28 is completely enclosed in the heating body 2.

[0062] The semi-enclosed air cavity and the closed air cavity here refer to being semi-enclosed or closed relative to the heating body 2. The heat insulation buffer cavity 28 is always sealed relative to the steam generating device after the top cover 1 is closed.

[0063] The assembly of the heat insulation buffer cavity 28 of the closed air cavity can also adopt a similar processing method as the heating tube mounting groove 21, that is, the closed air cavity is formed through steps such as grooving and sealing, which will not be described in detail here.

[0064] The top cover 1 can be made of the same or similar metal material as the heating body 2. The size of the top cover 1 is precisely matched with the size of the heating body 2 to ensure that there are no gaps after the cover is closed.

[0065] After the top cover 1 is closed onto the heating body 2, the steam generator forms a relatively sealed cavity structure, which can accommodate the fluid and provide space for the flow and heat exchange of the fluid.

[0066] In some alternative embodiments, a sealing ring is provided between the mating surfaces of the top cover 1 and the heating body 2, and the top cover 1 and the heating body 2 are fastened together by bolts.

[0067] The sealing ring enhances the seal between the top cover 1 and the heating body 2, preventing steam leakage and ensuring the normal operating pressure of the device. The bolt fastening method ensures the firmness and stability of the connection between the top cover 1 and the heating body 2, while also facilitating disassembly and maintenance.

[0068] The working process of the steam generator is described below.

[0069] After the heating element 3 is connected to the power supply, it generates heat, which is quickly conducted to the entire heating body 2 and evenly radiated to the vaporization channel 22 area. External water flows in through the inlet 11 at the top of the top cover 1, and is then dispersed into a fine mist by the omnidirectional nozzle 12 with arrayed atomizing holes at the bottom of the top cover 1, and evenly sprayed into the starting section 221 of the vaporization channel 22. After the fluid enters the starting section 221, it is accelerated by gravity due to the inclined slope set in the starting section 221, and flows quickly and smoothly into the retention section 222, avoiding water accumulation at the inlet and localized sudden cooling.

[0070] After entering the stagnant section 222, which has a smooth, circular arc shape, the fluid slowly flows along the arc-shaped flow channel and absorbs heat. The hemispherical micro-pit structures 24 arranged in an array at the bottom of the initiation section 221 and the stagnant section 222 induce secondary vortices in the fluid, effectively disrupting the near-wall thermal boundary layer and significantly enhancing convective heat transfer efficiency. At the same time, the Tesla valve microstructures 23 on the sidewall of the stagnant section 222 maintain the forward smooth flow of water. When water vapor flashes and generates a high-pressure reverse shock wave, the reverse airflow energy can be dissipated by the geometric flow channel structure, forming high reverse flow resistance and preventing steam backflow and steam pulsation.

[0071] The gas-liquid two-phase fluid, formed by sufficient heat absorption and phase change, continues to flow into the terminal section 223 and enters the funnel-shaped micro cyclone separation chamber 25, where steam and water are separated under centrifugal force. The dry steam is ejected upward through the steam outlet 13 of the top cover 1, while the incompletely vaporized droplets thrown off by centrifugation fall along the chamber wall and converge into the energy-concentrating flash evaporation cavity 26, which is connected to the micro cyclone separation chamber 25. The high-density micro-needle fin array 27 at the bottom of the energy-concentrating flash evaporation cavity 26 has a large specific surface area and capillary heat transfer effect, which performs secondary energy-concentrating heating and explosive vaporization on the converged droplets, further improving the dryness of the steam.

[0072] Meanwhile, the heat-insulating buffer chamber 28 set between the starting section 221 and the ending section 223 utilizes the heat insulation properties of air to block heat conduction between the low-temperature water inlet zone and the high-temperature steam zone, avoiding thermal short circuits and ensuring stable outlet steam temperature. The top cover 1 and the heating body 2 are sealed with a sealing ring and fastened with bolts, maintaining the chamber's sealed pressure throughout the process, ensuring that the whole machine continuously, stably, and with high quality produces dry steam, meeting the normal ironing operation requirements of the steam garment steamer.

[0073] The present invention also proposes a steam garment steamer, which includes the steam generating device described above.

[0074] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A steam generating device, characterized in that, include: The heating body and the sealing cover are fitted onto the top cover of the heating body; The top cover is provided with a water inlet and a steam outlet; A heating tube is embedded and fixed in the bottom solid of the heating body, and the two connecting ends of the heating tube are led outward from the side of the heating body; The top of the heating body is integrally formed with a vaporization channel, which includes a starting section, a retention section and a termination section connected in sequence, and the heating tube is correspondingly arranged in the area below the vaporization channel. The starting section corresponds to the inlet, and the starting section has an inclined slope to accelerate the fluid. The retention section adopts a smooth structure with a circumferential arc shape. Part of the sidewall of the retention section has a Tesla valve microstructure with unidirectional fluid flow without moving parts. The Tesla valve microstructure includes multiple branch loops arranged sequentially along the flow direction. The terminating section corresponds to the steam outlet, and the terminating section includes a funnel-shaped micro cyclone separator.

2. The steam generating device according to claim 1, characterized in that, The bottom of the top cover is provided with an omnidirectional nozzle with an array of atomizing holes corresponding to the water inlet.

3. The steam generating device according to claim 1, characterized in that, The heating element has a multi-bend curved structure.

4. The steam generating device according to claim 1, characterized in that, The bottom array of the starting segment and the retention segment is arranged with hemispherical micro-pit structures.

5. The steam generating apparatus according to claim 1, characterized in that, The termination section also includes a focusing flash evaporation cavity, the top of which is connected to the bottom of the micro cyclone separation chamber.

6. The steam generating apparatus according to claim 5, characterized in that, The bottom of the energy-concentrating flash evaporation cavity has a high-density micro-needle fin array.

7. The steam generating apparatus according to claim 1, characterized in that, The starting segment and the ending segment are arranged adjacent to each other, and the heating body between the starting segment and the ending segment is provided with a heat insulation buffer cavity.

8. The steam generating apparatus according to claim 7, characterized in that, The heat insulation buffer cavity is a closed air cavity or a semi-closed air cavity.

9. The steam generating apparatus according to claim 1, characterized in that, A sealing ring is provided between the mating surfaces of the top cover and the heating body, and the top cover and the heating body are fastened together by bolts.

10. A steam garment steamer, characterized in that, The steam garment steamer includes the steam generating device as described in any one of claims 1 to 9.

Images