Novel steam generator

Abstract

The utility model discloses a novel steam generator, including heater, and the flow channel of setting in the coil, the coil is installed in the heater one side through any one of following modes: the coil is brazed in the heater one side through aluminum foil, the coil is installed in the heater one side through aluminum block, and the heat conduction disc is installed in the heater one side, and the coil is installed in the heat conduction disc. The aluminum foil, aluminum plate are pressed between the heater and the coil, then carry out brazing or installation, can improve the interface structure and performance of the welding surface, improve stability, through the mode of heat conduction disc indirect installation, still can improve the contact area of coil, reduce the contact area of coil and air, improve the brazing area of heat conduction disc and heater simultaneously, improve the heat transfer efficiency.

Description

Technical Field

[0001] This utility model relates to the field of heater technology, specifically to a novel steam generator. Background Technology

[0002] A steam generator is a device that uses thermal energy to heat water into hot water or steam. Existing technology uses large equipment such as boilers and heating coils to generate steam by heating with electricity. These devices are large and difficult to apply to lightweight usage scenarios, such as steam mops.

[0003] Patent CN217441597U discloses a micro steam generator in which a thick film heater is tightly integrated into one side of a steam generating chamber. The heat emitted by the thick film heater can be quickly and effectively transferred to the steam generating chamber. The upper end of the steam generating chamber is tightly welded to a metal substrate.

[0004] Patent CN217636221U discloses a novel liquid heating device in which the temperature sensing probe of a snap-action temperature controller is attached to the middle of the stainless steel substrate 22, and the flat surface of the stainless steel flat tube is directly brazed onto the stainless steel substrate of the thick film heating plate.

[0005] Direct brazing easily forms weld slag, which has a significant impact on the strength and stability of the connection. Utility Model Content

[0006] In view of the above-mentioned technical problems existing in the prior art, this utility model provides a new type of steam generator that improves connection strength and stability.

[0007] This utility model discloses a novel steam generator, including a heater and a flow channel disposed in a coil, wherein the coil is installed on one side of the heater in any of the following ways: the coil is brazed to one side of the heater by aluminum foil; the coil is installed on one side of the heater by an aluminum block; and a heat-conducting plate is installed on one side of the heater, and the coil is installed in the heat-conducting plate.

[0008] Preferably, the coil is a flat tube; the coil is serpentine or spiral.

[0009] Preferably, the coil has a first port and a second port at both ends; A central through-hole is provided in the middle of the steam generator.

[0010] Preferably, it also includes a temperature control component disposed on one side of the coil or heat transfer plate, wherein the temperature control component is selected from: a temperature controller, a fuse, and a temperature sensor.

[0011] Preferably, a base plate is provided on one side of the flow channel, and the temperature control component is disposed on the base plate.

[0012] Preferably, the detection ends of the thermostat, fuse, and temperature sensor are spaced apart on the base plate; The thermostat, fuse, and temperature sensor are fixed on the bracket; The bracket is mounted on the base plate; A first heat shrink tubing is provided on the outside of the fuse.

[0013] Preferably, the bracket is provided with a slot, and the temperature sensor is installed in the slot; The temperature measuring end of the temperature sensor is attached to the base plate. A spring is provided on one side of the temperature measuring end, and a gasket is provided on the outside of the spring. The gasket is engaged in the slot.

[0014] Preferably, the heat-conducting plate and the heater are respectively provided with matching bosses and grooves.

[0015] Preferably, the heater includes a substrate and a resistor group disposed on the substrate, wherein the resistor group is covered with an insulating medium on the outside and has an intermediate dielectric layer disposed on the inside; A connector is provided on one side of the substrate, and the connector is provided with a first connection end and a second connection end, which are respectively connected to the two ends of the resistor group.

[0016] Preferably, a mounting position is provided on the outer peripheral side of the substrate; The substrate is made of stainless steel.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows: sandwiching aluminum foil or aluminum plate between the heater and the coil before brazing or installation can improve the interface structure and performance of the welding surface and enhance stability; indirect installation via a heat-conducting plate can also increase the contact area of ​​the coil, reduce the contact area between the coil and the air, and improve the heat transfer efficiency while increasing the brazing area between the heat-conducting plate and the heater. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the steam generator structure in Example 1; Figure 2 This is a schematic diagram of the heater's structure; Figure 3 This is a schematic diagram of the grounding terminal installation in Example 2; Figure 4 This is a schematic diagram of the steam generator structure in Example 3; Figure 5 This is a cross-sectional view of the steam generator in Example 3; Figure 6 This is a schematic diagram showing the distribution of the connecting components; Figure 7 This is a schematic diagram of the substrate structure; Figure 8 This is an exploded view of a direct-welded coil. Figure 9 This is an exploded view of an aluminum foil-welded coil. Figure 10 This is an exploded view of an embedded coil.

[0019] Marked in the diagram: 1. Steam generator; 11. Central through-hole; 12. Temperature control component; 2. Heater; 21. Substrate; 211. Mounting position; 213. Aluminum foil; 22. Resistor group; 221. Conductor; 222. Resistor element; 23. Insulating medium; 231. Intermediate dielectric layer; 25. First connection terminal; 26. Second connection terminal; 28. Connecting seat; 29. ​​Groove; 3. Flow channel; 31. Coil; 32. First port; 33. Second port; 35. Base plate; 37. Heat transfer plate; 38. Boss; 4. Thermostat; 5. Fuse; 6. Grounding terminal; 7. Temperature sensor; 71. Temperature measuring end; 72. Spring; 73. Gasket; 8. Bracket; 81. Slot; 85. First heat shrink tubing; 9. Connecting component; 91. First connecting wire; 92. Second connecting wire; 93. Third connecting wire; 94. Ground wire; 95. Fifth connecting wire. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] The present invention will now be described in further detail with reference to the accompanying drawings: The first embodiment provides a novel steam generator 1, such as... Figures 1-10 As shown, it includes a flow channel 3, and heaters 2 and temperature control components 12 respectively disposed on both sides of the flow channel 3. The temperature control components 12 are selected from: a temperature controller 4, a fuse 5 and a temperature sensor 7.

[0022] Heater 2 heats flow channel 3 and the fluid in flow channel 3. Flow channel 3 is detected or controlled by temperature control component 12 to improve the accuracy of detection or control and reduce or avoid interference from the heat of heater 2 to temperature control component 12.

[0023] like Figure 1 and Figure 3A coil 31 is provided on one side of the heater 2, and the flow channel 3 is disposed within the coil 31. The main body of the coil 31 is spiral-shaped, and a first port 32 and a second port 33 are respectively provided at both ends of the coil 31 for water inlet or outlet. The first port 32 can be set as the water inlet and the second port 33 as the water outlet, or the first port 32 can be set as the water outlet and the second port 33 as the water inlet. Figure 1 The first port 32 extends outward from the coil 31, and the second port 33 extends downward, that is, away from the heater 2.

[0024] like Figure 8 As shown, the coil 31 is brazed onto the substrate 21. This structure is also called a direct-welded type. Depending on the material of the coil 31, it can be divided into aluminum tube direct-welded type and steel tube direct-welded type. In a specific embodiment, the coil 31 is a flat tube.

[0025] The coil 31 can be brazed to one side of the heater 2 to achieve a metallurgical bond, forming a seamless, tightly fitted interface with extremely low thermal resistance. The coil 31 can be coiled into a serpentine, spiral, or other geometric shape to cover the main heat-generating area of ​​the heater 2.

[0026] A base plate 35 is provided on one side of the flow channel 3, and the temperature control component 12 is disposed on the base plate 35. Figure 3 The bracket 8 was removed, from Figure 3 As can be seen, the detection ends of the thermostat 4, fuse 5, and temperature sensor 7 are spaced apart on the base plate 35. The bracket 8 is mounted on the base plate 35, and the thermostat 4, fuse 5, and temperature sensor 7 are fixed on the bracket 8.

[0027] like Figure 6 The bracket 8 is provided with a slot 81, and the temperature sensor 7 is installed in the slot 81. More specifically, the temperature measuring end 71 of the temperature sensor 7 is close to the base plate 35, a spring 72 is provided on one side of the temperature measuring end 71, and a gasket 73 is provided on the outside of the spring 72. The gasket 73 is engaged in the slot 81.

[0028] A first heat shrink tubing 85 is provided on the outside of the fuse 5.

[0029] In the second embodiment, unlike the first embodiment, a grounding terminal 6 is provided on the base plate 35 or the coil 31, and the grounding terminal 6 is connected to the external ground through the ground wire 94.

[0030] The third embodiment, such as Figure 4 and Figure 5 Unlike the first embodiment, a heat-conducting plate 37 is also provided, and the flow channel 3 and / or coil 31 are disposed within the heat-conducting plate 37. Figure 10 Also known as embedded coil 31, depending on the material of the coil 31, it is divided into steel pipe embedded type and aluminum pipe embedded type.

[0031] The heat-conducting plate 37 can be made of metal, with aluminum being preferred and 3003 aluminum alloy being even more preferred. The coil 31 can be made of metal, with aluminum and stainless steel being preferred and 3003 aluminum alloy being even more preferred.

[0032] The high thermal conductivity (approximately 200 W / m·K) of the aluminum tube (3003 aluminum alloy) allows the heat generated by the electric heating film to be instantly conducted from the heating point to the entire aluminum tube wall, realizing the transformation from "point heat source" to "surface heat dissipation". This fundamentally eliminates local overheating and solves the problem of plate bursting.

[0033] like Figure 4 A boss 38 and a groove 29 are respectively provided between the heat conduction plate 37 and the heater 2. Specifically, a groove 29 is provided on the outer side of the base plate 21 of the heater 2, and a boss 38 is provided on the outer side of the heat conduction plate 37. The boss 38 and the groove 29 cooperate to achieve positioning and installation.

[0034] In the fourth embodiment, unlike the direct soldering type of Embodiment 1, the aluminum foil 213 on one side of the substrate 21 is mounted on the coil 31, as shown below. Figure 9 As shown, this is also known as aluminum foil soldering.

[0035] Among them, such as Figure 7 The outer periphery of the substrate 21 may be provided with a mounting position 211 for easy installation in an external structure.

[0036] In the fifth embodiment, unlike the fourth embodiment, the aluminum foil 213 is replaced with an aluminum plate, that is, an aluminum plate is provided on one side of the substrate 21, and the coil 31 is mounted on the aluminum plate, which is called the aluminum plate welding type. Depending on the material of the coil 31, it can be divided into steel pipe aluminum plate welding type and aluminum pipe aluminum plate welding type.

[0037] By sandwiching aluminum foil or aluminum plate between the heater and the coil and then brazing or installing them, the interface structure and performance of the welded surface can be improved, thus increasing stability. Indirect installation via a heat-conducting plate can also increase the contact area of ​​the coil, reduce the contact area between the coil and the air, increase the brazing area between the heat-conducting plate and the heater, and improve heat transfer efficiency.

[0038] Figure 2 The structure of heater 2 is shown, specifically a heating plate, as follows: Figure 8The system includes a substrate 21 and a resistor group 22 disposed on the substrate 21. The resistor group 22 is covered with an insulating dielectric 23, and an intermediate dielectric layer 231 is disposed between the resistor group 22 and the substrate 21. The resistor group 22 includes a plurality of spaced resistor pieces 222 and a conductor 221 connecting two adjacent resistor pieces. The specific connection method is prior art and will not be described in detail here. A connector 28 is provided on one side of the substrate 21. The connector 28 is provided with a first connector 25 and a second connector 26, which are respectively connected to the two ends of the resistor group 22. The substrate 21 may be made of stainless steel.

[0039] Figure 2 The central through-hole 11 located in the middle of the steam generator 1 is also shown for reducing material, weight, and positioning.

[0040] Figure 6 The connecting assembly 9 is shown. The first connecting end 25 is provided with a fifth connecting line 95, which is connected to a fuse 5. The fuse 5 is connected to one end of a thermostat 4, and the other end of the thermostat 4 is provided with a second connecting line 92. The second connecting end 26 is provided with a first connecting line 91. The temperature sensor 7 is provided with a third connecting line 93.

[0041] This invention improves the safety of the steam generator 1 by rationally arranging the temperature control component 12: on the one hand, the heater 2 and the temperature control component 12 are respectively arranged on opposite sides of the flow channel 3; on the other hand, the temperature controller 4 and the fuse 5 are arranged in the electrode wire of the heater 2 for overheat protection; and the temperature of the flow channel 3 is measured individually by the temperature sensor 7. It features high efficiency, high reliability, and a suitable heating structure for liquid heating.

[0042] Heater 2 utilizes a rare-earth thick-film electric heating film, which offers advantages such as fast thermal response and high heating efficiency. Traditional electric heating film heaters face significant technical bottlenecks when directly heating liquids (especially water): due to the small heat capacity and high power density of the heating film itself, coupled with the uneven cooling rate of the liquid, heat on the heating film surface is easily unable to dissipate in a timely and uniform manner, forming localized overheating spots. This localized overheating leads to thermal stress concentration, ultimately causing the heating film to crack and peel off, a phenomenon known as "film bursting," resulting in product failure. Existing technologies typically limit the working load and operating temperature of the electric heating film, but this severely restricts its power density and application range.

[0043] Heater 2 serves as a planar heat source. The aluminum tube or heat-conducting plate 37 instantly conducts the heat generated by heater 2 from the heating point to the entire wall of the aluminum tube. The brazing process creates a strong metallurgical bond between the aluminum tube and the stainless steel substrate 21, resulting in extremely low interfacial thermal resistance and ensuring unimpeded and rapid heat transfer to the aluminum tube and the fluid. This robust connection also enhances the mechanical strength of the overall structure. Heat is efficiently and rapidly transferred to the liquid being heated, reducing heat loss during the transfer process and thus improving the overall thermal efficiency.

[0044] During operation, current flows through heater 2, causing it to heat up rapidly. The heat is then quickly conducted to the flow channel 3 inside the aluminum tube through the brazed interface, which has near-zero thermal resistance. The liquid flows through the flow channel 3, efficiently exchanging heat with the high-temperature inner wall of the aluminum tube, thus being heated.

[0045] In specific tests, the surface load of the electrothermal film can reach 80-100 W / cm². 2 The surface load of the comparison heater, model MK2-2019, is 40-50 W / cm². 2 The load is increased by more than 50%, the operating temperature of the heater surface is 170℃, and the temperature resistance reaches 400℃. At a power of 1500W, it can produce 60mL / min of high-temperature steam, while the comparison heater can only provide 45mL / min of steam.

[0046] Aluminum or steel pipes, as water containers, have a greater pressure-bearing capacity than other square containers, and can withstand pressures of over 40 Bar, which fully meets the requirements of coffee machine heaters. Square containers, on the other hand, become bulky and have a low cost-performance ratio if they exceed 20 Bar.

[0047] Due to rapid heat transfer, the heater itself generates little heat and has excellent temperature control. In specific tests, the outlet water temperature can be controlled at 98-99℃, and the flow rate stability can also be controlled within ±3g. In contrast, the outlet water temperature of the heater is below 95℃, and the flow rate stability is ±5g.

[0048] This invention has the advantages of reliable structure, high thermal efficiency, and long service life. It is applicable to a wide range of product categories, such as coffee machines. This invention also has market value in instant water heaters (rapid water dispensers, water dispensers, etc.).

[0049] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A novel steam generator, characterized in that, Includes a heater (2) and a flow channel (3) disposed within the coil (31), The coil (31) is mounted on one side of the heater (2) in any of the following ways: The coil (31) is brazed to one side of the heater (2) by aluminum foil (213); The coil (31) is mounted on one side of the heater (2) via an aluminum block; A heat-conducting plate (37) is installed on one side of the heater (2), and a coil (31) is installed inside the heat-conducting plate (37).

2. The novel steam generator according to claim 1, characterized in that, The coil (31) is a flat tube; The coil (31) is serpentine or spiral.

3. The novel steam generator according to claim 1, characterized in that, The coil (31) is provided with a first port (32) and a second port (33) at both ends; A central through hole (11) is provided in the middle of the steam generator (1).

4. The novel steam generator according to claim 1, characterized in that, It also includes a temperature control component (12) disposed on one side of the coil (31) or the heat transfer plate (37), wherein the temperature control component (12) is selected from: a temperature controller (4), a fuse (5) and a temperature sensor (7).

5. The novel steam generator according to claim 4, characterized in that, A base plate (35) is provided on one side of the flow channel (3), and the temperature control component (12) is provided on the base plate (35).

6. The novel steam generator according to claim 5, characterized in that, The detection ends of the thermostat (4), fuse (5) and temperature sensor (7) are spaced apart on the base plate (35); The thermostat (4), fuse (5) and temperature sensor (7) are fixed on the bracket (8); The bracket (8) is mounted on the base plate (35); A first heat shrink tubing (85) is provided on the outside of the fuse (5).

7. The novel steam generator according to claim 6, characterized in that, The bracket (8) is provided with a slot (81), and the temperature sensor (7) is installed in the slot (81); The temperature measuring end (71) of the temperature sensor (7) is attached to the base plate (35). A spring (72) is provided on one side of the temperature measuring end (71). A gasket (73) is provided on the outside of the spring (72). The gasket (73) is engaged in the slot (81).

8. The novel steam generator according to claim 1, characterized in that, The heat-conducting plate (37) and the heater (2) are respectively provided with matching bosses (38) and grooves (29).

9. The novel steam generator according to claim 1, characterized in that, The heater (2) includes a substrate (21) and a resistor group (22) disposed on the substrate (21). The resistor group (22) is covered with an insulating medium (23) on the outside and has an intermediate dielectric layer (231) on the inside. A connector (28) is provided on one side of the substrate (21). The connector (28) is provided with a first connector (25) and a second connector (26). The first connector (25) and the second connector (26) are respectively connected to the two ends of the resistor group (22).

10. The novel steam generator according to claim 9, characterized in that, A mounting position (211) is provided on the outer periphery of the substrate; The substrate (21) is made of stainless steel.

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