Steam generating device

Abstract

The utility model discloses a steam generation device which comprises a fluid channel, the fluid channel comprises a pressure storage channel, a pressure release channel and a flow limiting hole, the steam generation device comprises a heating pipe, the pressure storage channel and the pressure release channel are located in the heating pipe, and the flow limiting hole communicates with the pressure storage channel and the pressure release channel. The flow area corresponding to the flow limiting holes (21) is S, and S is smaller than or equal to pi 3.52 mm < 2 >. Gas-liquid mixed fluid in the pressure storage channel flows through the flow limiting hole and enters the pressure release channel, and the flow area S of the flow limiting hole is smaller than or equal to pi 3.52 mm < 2 >, so that liquid which flows through the flow limiting hole and is not vaporized easily forms liquid drops with small sizes, the liquid drops are heated and vaporized more easily in the pressure release channel, the vaporization amount of the fluid is increased, and the pressure release effect is improved. The mixing amount of liquid in steam discharged by the steam generation device is reduced, and the use quality of the steam generation device is improved.

Description

Technical Field

[0001] This utility model relates to the field of household appliance technology, and in particular to a steam generating device. Background Technology

[0002] Some everyday household appliances often require steam to be generated during use. For example, floor scrubbers have steam or hot water outlets at their contact surfaces with the floor to effectively clean the floor. Irons, on the other hand, have steam outlets at their contact surfaces with clothing to soften the clothes and achieve better ironing results.

[0003] In related technologies, the efficiency of fluid vaporization when flowing through the heating tubes in steam generating devices is low, resulting in the steam being mixed with a large amount of liquid, which affects the normal operation of the steam generating device. Utility Model Content

[0004] The purpose of this invention is to at least solve the problems in the background art by providing a steam generating device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A steam generating device includes a fluid channel comprising a pressure accumulating channel, a pressure releasing channel, and a flow restricting orifice. The steam generating device includes a heating tube. At least a portion of the pressure accumulating channel and the pressure releasing channel is located within the heating tube. The flow restricting orifice connects the pressure accumulating channel and the pressure releasing channel. The flow area corresponding to the flow restricting orifice is S, where S ≤ π / 3.5. 2 mm 2 .

[0007] In the steam generator of the above technical solution, the fluid in the pressure accumulator channel flows through the flow-limiting orifice into the pressure relief channel, and the flow area S of the flow-limiting orifice satisfies: S≤π3.5 2 mm 2 This allows the pressure accumulating channel to store a certain pressure, and the fluid, under the action of pressure, is ejected from the flow restrictor. This makes it easier for the unvaporized liquid flowing through the flow restrictor to form smaller droplets, which are then more easily heated and vaporized in the pressure relief channel. This increases the amount of fluid vaporization, reduces the amount of liquid mixed in the steam discharged from the steam generator, and improves the performance of the steam generator.

[0008] The features and advantages of this utility model will be disclosed in detail in the following specific embodiments and accompanying drawings. Attached Figure Description

[0009] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0010] Figure 1 This is a schematic diagram of the exploded structure of a steam generator according to one embodiment;

[0011] Figure 2 This is an exploded structural diagram of the connection portion in one embodiment;

[0012] Figure 3 This is a schematic diagram illustrating the structure of the cover plate and the sealing ring in one embodiment;

[0013] Figure 4 This is a schematic diagram illustrating the cover plate structure in one embodiment;

[0014] Figure 5 This is a schematic cross-sectional view of a steam generator according to one embodiment;

[0015] Figure 6 This is a cross-sectional structural schematic diagram of a steam generator according to another embodiment;

[0016] Figure 7 This is a cross-sectional structural schematic diagram of a steam generator according to another embodiment;

[0017] Figure 8 This is a cross-sectional structural schematic diagram of a steam generator according to another embodiment;

[0018] Figure 9 This is a schematic diagram of a steam generator according to one embodiment;

[0019] Figure 10 This is a schematic diagram of a steam generator according to one embodiment.

[0020] Figure label:

[0021] 1. Heating tube; 11. First tube; 12. Second tube; 111. Pressure accumulator channel; 121. Pressure release channel; 13. Electrode; 2. Pressure accumulator section; 21. Flow limiting orifice; 200. Pressure accumulator component; 3. Connecting part; 31. Base; 311. Annular enclosure part; 32. Cover plate; 321. Annular protrusion part; 3211. Annular groove; 322. First connector; 323. Second connector; 33. Sealing ring; 34. Transition cavity; 41. First sealing sleeve; 42. Second sealing sleeve; 5. Outer shell; 51. Mounting cavity; 52. Mounting hole; 6. Thermostat. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. In the description of this application, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "lateral", "longitudinal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0023] like Figures 1-10 As shown, a steam generating device according to this embodiment includes a fluid channel, which includes a pressure accumulating channel 111, a pressure releasing channel 121, and a flow limiting orifice 21. The steam generating device includes a heating tube 1. The pressure accumulating channel 111 and the pressure releasing channel 121 are located on the heating tube 1. The flow limiting orifice 21 connects the pressure accumulating channel 111 and the pressure releasing channel 121, and the corresponding flow area is S, where S ≤ π3.5. 2 mm 2 .

[0024] During the operation of the steam generator, liquid fluid enters the pressure storage channel 111 from the inlet of the heating pipe 1. The liquid fluid is initially heated in the pressure storage channel 111, and part of the liquid fluid is vaporized to form a gas-liquid mixture. This gas-liquid mixture flows through the flow-limiting orifice 21 and enters the pressure relief channel 121. The flow area of ​​the flow-limiting orifice 21 is smaller than the flow areas of both the pressure storage channel 111 and the pressure relief channel 121. Because the flow area of ​​the flow-limiting orifice 21 is small, less than or equal to π3.5... 2 mm 2 The flow path of the liquid fluid is narrowed, which prevents a large amount of unvaporized liquid fluid from entering the pressure relief channel 121 in a clustered manner and making it difficult to form small droplets. This makes it easier for unvaporized liquid fluid to form small droplets. The pressure relief channel 111 further heats the droplets, increasing the vaporization rate of the liquid fluid. On the other hand, the pressure of the pressure storage channel 111 increases under the action of the flow restriction orifice 21, which allows unvaporized liquid fluid to be ejected through the flow restriction orifice 21 to the pressure relief channel 121, making it easier to form small droplets.

[0025] Furthermore, when the pressure in the accumulator channel 111 is high, the boiling point of the liquid in the accumulator channel 111 increases. For example, under normal circumstances, when the liquid water in the accumulator channel 111 reaches 100 degrees Celsius, it vaporizes. However, when the pressure is high, the liquid water can be heated to a higher temperature. For example, the liquid water in the accumulator channel 111 may reach 105 degrees Celsius but still not vaporize. When this part of the liquid water with a temperature exceeding 100 degrees Celsius and not vaporized enters the pressure relief channel 121, the pressure is instantly reduced. Therefore, this part of the liquid water will vaporize without additional heating. Moreover, due to the presence of liquid water with a boiling point higher than normal, it fills the temperature drop when steam or steam mixed with liquid is discharged from the steam generator, further increasing the vaporization efficiency of the steam generator, reducing the amount of liquid mixed in the steam discharged from the steam generator, and improving the quality of use of the steam generator.

[0026] The flow-limiting hole 21 can be circular, in which case the inner diameter of the hole 21 is less than or equal to 3.5 mm. Of course, in other embodiments, the shape of the flow-limiting hole 21 can also be rectangular or other irregular shapes.

[0027] In one embodiment, such as Figures 1-7 As shown, the steam generator includes a connecting part 3, the heating tube 1 includes a first tube 11 and a second tube 12, the connecting part 3 connects the first tube 11 and the second tube 12, at least a portion of the pressure accumulating channel 111 is located in the first tube 11, at least a portion of the pressure relief channel 121 is located in the second tube 12, and the flow limiting hole 21 is provided in the connecting part 3.

[0028] In one embodiment, the connecting part 3 includes a pressure storage part 2, and a flow limiting hole 21 is provided in the pressure storage part 2. The pressure storage part 2 is part of the connecting part 3. The pressure storage part 2 can extend into the interior of the first tube 11 or be located outside the first tube 11. When the pressure accumulator 2 is located inside the first tube 11, the pressure accumulator channel 111 includes the channel between the pressure accumulator 2 inside the first tube 11 and the inlet of the first tube 11, and the pressure release channel 121 includes the channel between the pressure accumulator 2 inside the first tube 11 and the outlet of the first tube 11, as well as the inner channel of the second tube 12; when the pressure accumulator 2 is located outside the first tube 11 and not inside the second tube 12, the pressure accumulator channel 111 includes the inner channel of the first tube 11, and the pressure release channel 121 includes the inner channel of the second tube 12; when the pressure accumulator 2 extends into the second tube 12, the pressure accumulator channel 111 includes the inner channel of the first tube 11, and the channel between the pressure accumulator 2 inside the second tube 12 and the inlet of the second tube 12, and the pressure release channel 121 includes the channel between the pressure accumulator 2 inside the second tube 12 and the outlet of the second tube 12.

[0029] Understandably, during normal operation of the steam generator, the pressure in the accumulator channel 111 is greater than the pressure in the depressurization channel 121. During normal operation, fluid continuously enters the accumulator channel 111 and is blocked by the accumulator 2 (part of the fluid and steam are discharged to the depressurization channel 121 through the flow-limiting orifice 21, thus increasing the pressure in the accumulator channel 111). When the pressure in the accumulator channel 111 reaches a certain value, the flow rate of fluid and steam discharged to the depressurization channel 121 through the flow-limiting orifice 21 reaches a dynamic balance with the flow rate of fluid flowing into the accumulator channel 111, thereby achieving a dynamic balance in the output flow rate of the steam generator.

[0030] The connecting part 3 facilitates the connection between the first pipe 11 and the second pipe 12, and can change the flow path of the fluid, improving the space occupied by the steam generator. In one embodiment, the first pipe 11 and the second pipe 12 are arranged side by side, saving space occupied by the steam generator; of course, the first pipe 11 and the second pipe 12 can also be concentric, perpendicular, or have other connection shapes.

[0031] In one embodiment, such as Figures 2-4 As shown, the connecting part 3 includes a cover plate 32, a first connector 322 that is sealed to the first pipe 11, and a second connector 323 that is sealed to the second pipe 12. The first connector 322 and the second connector 323 are connected to the cover plate 32.

[0032] In one embodiment, the pressure accumulator 2 is part of the first connector 322, which includes a first connector body and the pressure accumulator 2. A flow-limiting orifice 21 is disposed in the pressure accumulator 2. The pressure accumulator 2 is integrally formed with the first connector body or fixed by welding or screwing. At least a portion of the pressure accumulator 2 is located within the channel corresponding to the first connector body. Figures 6-7 As shown. The main body of the first connector includes a first annular connecting part 3, which is sleeved on the outlet end of the first pipe 11. Further, a first sealing sleeve 41 is sleeved on the outlet end of the first pipe 11, and the first annular connecting part 3 is sleeved on the first sealing sleeve 41. The first sealing sleeve 41 is in contact with the pressure accumulator 2 or there is a gap between them.

[0033] In another embodiment, the pressure accumulator is part of the second connector 323, which includes a second connector body and a pressure accumulator 2. A flow-limiting orifice 21 is provided in the pressure accumulator 2, and at least a portion of the pressure accumulator 2 is located in the channel corresponding to the second connector body. The pressure accumulator 2 is integrally formed with the second connector body or fixed by welding or screwing. The second connector body includes a second annular connecting portion 3, which is sleeved on the inlet end of the second tube 12. Further, a second sealing sleeve 42 is sleeved on the inlet end of the second tube 12, and the second annular connecting portion 3 is sleeved on the second sealing sleeve 42. The second sealing sleeve 42 is either in contact with the pressure accumulator 2 or has a gap.

[0034] In another embodiment, such as Figure 4 , Figure 5 As shown, a flow-limiting orifice 21 is provided on the cover plate 32, and the flow-limiting orifice 21 is opposite to the outlet end of the first pipe 11 or the inlet end of the second pipe 12. It can be understood that at least a portion of the cover plate 32 serves as a pressure accumulator 2, and the flow-limiting orifice 21 is provided in the pressure accumulator 2.

[0035] In one embodiment, the connecting part 3 has a transition cavity 34, which is connected to the flow limiting hole 21. The transition cavity 34 is connected to the pressure storage channel 111 and the pressure relief channel 121. After the fluid flows through the pressure storage channel 111, the transition cavity 34 and the flow limiting hole 21 (the transition cavity 34 and the flow limiting hole 21 are not sequential), and the pressure relief channel 121, it is discharged from the steam generator.

[0036] In one embodiment, the connecting portion 3 includes a base 31 and a cover plate 32 that are sealed together. At least a portion of the transition cavity 34 is located on the base 31 or the cover plate 32. A first connector 322 and a second connector 323 are disposed on the cover plate 32. Further, the base 31 has an annular enclosure portion 311, and the transition cavity 34 is located within the space enclosed by the annular enclosure portion 311. The cover plate 32 covers the annular enclosure portion 311, at which time the transition cavity 34 is located on the base 31.

[0037] In one embodiment, the cover plate 32 has an annular protrusion 321 on the side facing the base 31. The annular protrusion 321 is sealed to the annular enclosure portion 311, forming a transition cavity 34. In this case, part of the transition cavity 34 is located on the base 31, and part of the transition cavity 34 is located on the cover plate 32. In another embodiment, the base 31 and the cover plate 32 are fixedly connected by screws. The side wall of the annular protrusion 321 of the cover plate 32 has an annular groove 3211, and the annular groove 3211 has a sealing ring 33 to ensure the sealing between the annular protrusion 321 and the annular enclosure portion 311. Figure 3 As shown. Specifically, the annular enclosure portion 311 covers at least a portion of the annular protrusion portion 321, the annular groove 3211 is located on the outside of the annular protrusion portion 321, and the sealing ring 33 is respectively attached to the groove wall of the annular groove 3211 and the inner wall of the annular enclosure portion 311.

[0038] In one embodiment, the plate-shaped base 31 covers the cover plate 32 having an annular protrusion 321, at which time the transition cavity 34 is located in the space enclosed by the annular protrusion 321, that is, the transition cavity 34 is located in the cover plate 32.

[0039] It is understandable that when the flow-limiting orifice 21 is provided on the cover plate 32, the flow-limiting orifice 21 can be provided at the outlet end of the cover plate 32 and the first pipe, or at the inlet end of the cover plate 32 and the second pipe. Providing the flow-limiting orifice 21 on the cover plate 32 effectively utilizes the structure of the cover plate 32, reduces additional parts, and facilitates its production and processing, thereby simplifying the structure of the steam generator and saving production and processing costs.

[0040] In one embodiment, the first connector 322 and the second connector 323 are integrally formed on the cover plate 32, which facilitates their production and processing, and also facilitates the installation and disassembly of the first pipe 11, the second pipe 12 and the cover plate 32.

[0041] In one embodiment, such as Figure 8 As shown, the steam generating device includes a pressure accumulator 200, a flow restrictor 21 disposed within the pressure accumulator 200, which is located within the inner cavity of the heating tube 1. A pressure accumulator channel 111 and a pressure release channel 121 are located on opposite sides of the pressure accumulator 200. The heating tube 1 can be a single heating tube 1. The pressure accumulator 200 is integrally formed or welded to the heating tube 1. In this case, the pressure accumulator channel 111 includes a channel between the pressure accumulator 200 and the inlet of the heating tube 1, and the pressure release channel 121 includes a channel between the pressure accumulator 200 and the outlet of the heating tube 1. Of course, the number of heating tubes 1 can also be multiple, and these multiple heating tubes 1 can be connected by the aforementioned connecting part 3, silicone sleeve, or welding.

[0042] In one embodiment, the heating tube 1 has a heating film and a tube body. The heating film is located on at least a portion of the outer surface of the tube body. Electrodes 13 are located at both ends of the heating tube 1 and are electrically connected to the heating film. The heating film comprises a film material with distributed heating resistance wires and thermally conductive material, and the heating film has the effect of being lightweight and providing efficient heating. Alternatively, a film material capable of heating using existing conventional technology can also be selected.

[0043] In one embodiment, such as Figures 9-10 As shown, the steam generator includes a housing 5, the housing 5 having a mounting cavity 51, at least a portion of the heating tube 1 being located in the mounting cavity 51, the housing 5 having a mounting hole 52, the steam generator having a thermostat 6, at least a portion of the thermostat 6 being located in the mounting hole 52, and the thermostat 6 being assembled, fixed, or limited to the housing 5.

[0044] On the one hand, the outer casing 5 protects the heating tube 1, reducing the probability of the heating tube 1 being damaged by impact; on the other hand, the outer casing 5 allows the steam generator to be easily installed at the desired location. The heating tube 1 may be partially located in the mounting cavity 51 of the outer casing 5, or the entire heating tube 1 may be located in the mounting cavity 51 of the outer casing 5.

[0045] Furthermore, the outer casing 5 is provided with a threaded hole, and the connecting part 3 is provided with a countersunk hole. By passing a screw through the countersunk hole and engaging with the threaded hole, the outer casing 5 and the connecting part 3 are fixedly installed.

[0046] The thermostat 6 is used to detect the temperature of the heating tube 1 and can adjust the heating power of the heating film in a timely manner so that the steam generator can provide the required heating power according to the different flow rates of the fluid. The mounting hole 52 is used to install the thermostat 6 on the one hand, and to reduce the isolation between the thermostat 6 and the heating tube 1 on the other hand, so that the thermostat 6 can detect the temperature of the heating tube 1 more accurately and adjust the heating temperature more precisely.

[0047] In one embodiment, the flow area S corresponding to the flow-limiting orifice 21 satisfies: πmm 2 ≤S≤π2.5 2 mm 2 If the flow area of ​​the flow-limiting orifice 21 is too large, the diameter of the droplets flowing from the pressure storage channel 111 to the pressure relief channel 121 will be too large, affecting its vaporization efficiency; if the inner diameter of the flow-limiting orifice 21 is too small, it will affect the flow rate of the fluid and the steam discharge flow rate of the steam generator.

[0048] Furthermore, the number of flow-limiting orifices 21 is two or more, and the flow area S corresponding to any one of the flow-limiting orifices 21 satisfies: S≤π2.5 2 mm 2 Two or more flow-limiting orifices 21 divide the fluid into multiple parallel branches. Compared to a single flow-limiting orifice 21, although this reduces the pressure within the pressure storage channel 111 to some extent and decreases the splashing effect, the flow area S corresponding to any one flow-limiting orifice 21 is still relatively small, resulting in a smaller fluid mass per unit heated area. Therefore, the flowing liquid still maintains good heating and vaporization efficiency, increasing the fluid flow rate while ensuring a certain level of heating and vaporization efficiency. The flow area S corresponding to the flow-limiting orifice 21 satisfies: S ≤ π².5 2 mm 2 At the same time, the size of the flow-limiting orifice 21 is further reduced, making the liquid fluid flowing through the flow-limiting orifice 21 finer, thereby reducing the fluid mass per unit heated area and improving the vaporization efficiency of the liquid fluid.

[0049] Of course, there can also be one flow restrictor 21. In this case, the pressure in the pressure storage channel 111 can accumulate to a relatively large level, which allows the liquid fluid to splash out from the flow restrictor 21. It can then enter the pressure relief channel 121 and spread outwards more easily to form small droplets, thereby improving the vaporization efficiency of the liquid fluid in the pressure relief channel 121.

[0050] In another embodiment, the number of flow-limiting orifices 21 is one, two, or more, and the total flow area A corresponding to all the flow-limiting orifices 21 satisfies: A ≤ π3.52 mm 2 That is, the total flow area of ​​multiple flow-limiting orifices 21 is reduced, thereby enabling the pressure storage channel 111 to maintain a certain pressure, allowing the liquid fluid to flow through the flow-limiting orifices 21 and be ejected, thus making it easier to form small droplets and achieving better vaporization efficiency in the pressure relief channel 121.

[0051] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any technical solutions, concepts, and designs obtained by those skilled in the art by making equivalent substitutions or changes based on the technical solutions and inventive concepts of this utility model within the scope of the technology disclosed in this utility model should be covered within the scope of protection of this utility model.

Claims

1. A steam generating device, characterized in that, The device includes a fluid channel comprising a pressure-accumulating channel (111), a pressure-relieving channel (121), and a flow-limiting orifice (21). The steam generator includes a heating tube (1). At least a portion of the pressure-accumulating channel (111) and the pressure-relieving channel (121) is located within the heating tube (1). The flow-limiting orifice (21) connects the pressure-accumulating channel (111) and the pressure-relieving channel (121). The flow area corresponding to the flow-limiting orifice (21) is S, where S ≤ π / 3.

5. 2 mm 2 .

2. The steam generating device according to claim 1, characterized in that, The steam generator includes a connecting part (3), the heating tube (1) includes a first tube (11) and a second tube (12), the connecting part (3) connects the first tube (11) and the second tube (12), at least a portion of the pressure accumulating channel (111) is located in the first tube (11), at least a portion of the pressure releasing channel (121) is located in the second tube (12), and the flow limiting hole (21) is provided in the connecting part (3).

3. The steam generating device according to claim 2, characterized in that, The connecting part (3) includes a cover plate (32), a first connector (322) that is sealed to the first tube (11), and a second connector (323) that is sealed to the second tube (12). The first connector (322) and the second connector (323) are connected to the cover plate (32). The flow limiting hole (21) is provided on the cover plate, or the flow limiting hole (21) is provided on the first connector (322) or the second connector (323).

4. The steam generating apparatus according to claim 2 or 3, characterized in that, The connecting part (3) has a transition cavity (34), which is connected to the flow limiting hole (21). The transition cavity (34) is connected to the flow limiting hole (21) and the pressure storage channel (111) and the pressure release channel (121).

5. The steam generating apparatus according to claim 4, characterized in that, The connecting part (3) includes a base (31) which is sealed to a cover plate (32). At least a portion of the transition cavity (34) is located on the base (31) or the cover plate (32). The cover plate (32) has an annular protrusion (321) on the side facing the base (31). At least a portion of the transition cavity (34) is located inside the annular protrusion (321). The base (31) has an annular enclosure (311) which is sealed to the annular protrusion (321).

6. The steam generating apparatus according to claim 3, characterized in that, The connecting part (3) includes a base (31) and a cover plate (32) that are sealed together, and the first connector (322) and the second connector (323) are integrally formed on the cover plate (32).

7. The steam generating apparatus according to claim 2, characterized in that, The steam generating device includes a pressure accumulator (200), the connecting part (3) includes a pressure accumulator (2), the flow limiting hole (21) is provided in the pressure accumulator (2), the pressure accumulator (200) is located in the inner cavity of the heating tube (1), and the pressure accumulator channel (111) and the pressure release channel (121) are respectively located on both sides of the pressure accumulator (200).

8. The steam generating apparatus according to claim 1, 2, 3, 5, 6, or 7, characterized in that, The heating tube (1) has a heating film and a tube body, the heating film being located on at least a portion of the outer surface of the tube body, and electrodes (13) being provided at both ends of the heating tube (1), the electrodes (13) being electrically connected to the heating film.

9. The steam generating apparatus according to claim 8, characterized in that, The steam generator includes a housing (5) having a mounting cavity (51), at least a portion of the heating tube (1) being located in the mounting cavity (51), the housing (5) having a mounting hole (52), the steam generator having a thermostat (6) having at least a portion of the thermostat (6) being located in the mounting hole (52), the thermostat (6) being assembled, fixed, or limited to the housing (5).

10. The steam generating apparatus according to claim 1, 2, 3, 5, 6, 7, or 9, characterized in that, The number of flow-limiting orifices (21) is one, two, or more, and the flow area S corresponding to any one of the flow-limiting orifices (21) satisfies: S≤π2.5 2 mm 2 ; or, The number of flow-limiting orifices (21) is one, two, or more, and the total flow area A corresponding to all the flow-limiting orifices (21) satisfies: A ≤ π3.5 2 mm 2 .

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