Steam generator and steam cooking equipment

Abstract

The present invention relates to the technical field of devices with a steam generation function, and particularly to a steam generator and a steam cooking device. The steam generator includes a descaling assembly and a heating cavity for containing water; wherein, the descaling assembly includes a driving member and a descaling shaft, the descaling shaft is installed in the heating cavity, spiral grooves are formed on the side wall of the descaling shaft, the spiral grooves are opposite to the heat-conducting side wall of the heating cavity, and the driving member is used to drive the descaling shaft to rotate in the heating cavity. The steam generator and the steam cooking device provided by the present invention have less heat loss and high steam generation efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of devices with a steam generation function, and particularly to a steam generator and a steam cooking device. Background Art

[0002] A steam generator is a device that can heat water to generate steam and can be applied to steam cooking devices.

[0003] During the heating process of the heating cavity in the existing steam generator, the heat-conducting side wall of the heating cavity can transfer heat to the water in the cavity. During the heating process of the water, scale will be generated on the heat-conducting side wall. Moreover, as the working time of the steam generator increases, the scale accumulated on the heat-conducting side wall will become thicker and thicker. Because the heat-conducting ability of the scale is very poor, the heat conduction efficiency between the heat-conducting side wall with scale attached and the water will be reduced, affecting the steam generation efficiency of the steam generator.

[0004] In summary, how to overcome the above defects of the existing steam generator is a technical problem that those skilled in the art urgently need to solve. Summary of the Invention

[0005] The purpose of the present invention is to provide a steam generator and a steam cooking device to alleviate the technical problem that the existing steam generator has low steam generation efficiency due to easy accumulation of scale on the heat-conducting side wall.

[0006] The steam generator provided by the present invention includes a descaling assembly and a heating cavity for containing water.

[0007] Wherein, the descaling assembly includes a driving member and a descaling shaft. The descaling shaft is installed in the heating cavity. A spiral groove is formed on the side wall of the descaling shaft, and the spiral groove faces the heat-conducting side wall of the heating cavity. The driving member is used to drive the descaling shaft to rotate in the heating cavity.

[0008] Preferably, as an implementable manner, the driving member includes an impeller. The impeller is coaxially fixed with the descaling shaft. The impeller faces the water pump outlet of the steam generator, and the water flow ejected from the outlet of the water pump can impact the impeller to make the impeller rotate.

[0009] Preferably, as an implementable manner, the driving member includes a motor, and the output shaft of the motor is coaxially fixed with the descaling shaft.

[0010] Preferably, as an implementable manner, the heat-conducting side wall is a cylindrical structure, the descaling shaft is a cylinder with the spiral groove, and the heat-conducting side wall and the descaling shaft are coaxially matched. The radius difference between the outer circle of the descaling shaft and the heat-conducting side wall is between 0.05 - 0.5 mm.

[0011] Preferably, as an implementable manner, the cross-sectional area of the spiral groove gradually decreases from top to bottom.

[0012] Preferably, as an implementable manner, the spiral direction of the spiral groove from bottom to top is the same as the rotation direction of the descaling shaft.

[0013] Preferably, as an implementable manner, a water scale deposition cavity is arranged below the heating cavity, and the water scale deposition cavity is communicated with the bottom of the heating cavity.

[0014] Preferably, as an implementable manner, the steam generator further includes a drainage assembly, and the drainage assembly is communicated with the bottom of the water scale deposition cavity for discharging the water scale in the water scale deposition cavity.

[0015] Preferably, as an implementable manner, a coating is attached to the inner surface of the heat-conducting side wall of the heating cavity, and the surface energy of the coating is lower than the surface energy of the heat-conducting side wall.

[0016] Correspondingly, the present invention also provides a steam cooking device including the above steam generator.

[0017] Compared with the prior art, the advantages of the present invention are as follows:

[0018] The steam generator provided by the present invention includes a heating cavity and a descaling assembly. The descaling assembly specifically includes a driving member and a descaling shaft. Among them, the descaling shaft is installed in the heating cavity, and spiral grooves are formed on the side wall of the descaling shaft. The spiral grooves face the heat-conducting side wall of the heating cavity, and the driving member can drive the descaling shaft to rotate in the heating cavity.

[0019] When the driving member drives the descaling shaft to rotate, the spiral grooves on the descaling shaft can rotate synchronously with the descaling shaft. The water in the heating cavity will form a high-speed rotating eddy under the action of the rotating spiral grooves. In this way, the water flow will impact the heat-conducting side wall of the heating cavity at a relatively high speed, so that the water scale on the heat-conducting side wall of the heating cavity can be washed down, which can reduce the influence of the water scale on the heat conduction ability of the heat-conducting side wall. Thus, the heat loss is reduced, and the steam generation efficiency of the steam generator is improved.

[0020] The steam cooking device provided by the present invention includes the above steam generator. Therefore, it has all the advantages of the above steam generator, with less heat loss and high steam generation efficiency. Description of the Drawings

[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a partial cross-sectional structural schematic diagram of the first steam generator provided by an embodiment of the present invention to show the relative position relationship between the water outlet of the water pump and the impeller. The arrow in the figure indicates the flow direction of water or steam.

[0023] Figure 2 It is a cross-sectional structural schematic diagram of the first steam generator provided by an embodiment of the present invention to show the connection relationship and position relationship among the heating cavity, the descaling component, the water scale deposition cavity, and the drainage component. The arrow in the figure indicates the flow direction of water or steam.

[0024] Figure 3 It is a three-dimensional structural schematic diagram of the descaling component in the first steam generator provided by an embodiment of the present invention.

[0025] Figure 4 It is a cross-sectional structural schematic diagram of the second steam generator provided by an embodiment of the present invention.

[0026] Reference numerals: 100 - heating cavity; 200 - descaling component; 300 - water pump; 400 - water scale deposition cavity; 500 - drainage component;

[0027] 110 - heat conduction side wall; 120 - heating film;

[0028] 210 - descaling shaft; 220 - impeller; 230 - motor;

[0029] 211 - spiral groove. Specific Embodiments

[0030] The following will clearly and completely describe the technical solutions of the present invention with reference to the drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0032] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The present invention will be further described in detail below through specific embodiments in conjunction with the drawings.

[0034] See Figure 1 - Figure 4 The steam generator provided in this embodiment includes a heating cavity 100 and a descaling assembly 200. The descaling assembly 200 specifically includes a driving member and a descaling shaft 210. Among them, the descaling shaft 210 is installed in the heating cavity 100. A spiral groove 211 is formed on the side wall of the descaling shaft 210, and the spiral groove 211 faces the heat-conducting side wall 110 of the heating cavity 100. The driving member can drive the descaling shaft 210 to rotate in the heating cavity 100.

[0035] When the driving member drives the descaling shaft 210 to rotate, the spiral groove 211 on the descaling shaft 210 can rotate synchronously with the descaling shaft 210. The water in the heating cavity 100 will form a high-speed rotating eddy under the action of the rotating spiral groove 211. In this way, the water flow will impact the heat-conducting side wall 110 of the heating cavity 100 at a relatively high speed, so that the scale on the heat-conducting side wall 110 of the heating cavity 100 can be washed down, which can reduce the influence of the scale on the heat conduction ability of the heat-conducting side wall 110. Thus, the heat loss is reduced, and the steam generation efficiency of the steam generator is improved.

[0036] As an implementable manner, see Figure 1 - Figure 3 In the specific structure of the driving member, it includes an impeller 220. The impeller 220 is coaxially fixed with the descaling shaft 210, and the impeller 220 faces the water outlet of the water pump 300 of the steam generator. Thus, the water flow with a certain speed ejected from the water outlet of the water pump 300 can impact the impeller 220 to make the impeller 220 rotate, and the rotation of the impeller 220 will drive the descaling shaft 210 coaxially fixed with it to rotate synchronously.

[0037] It should be noted that by using the impeller 220 as the driving part, the impact force of the water flow can be directly utilized to drive the descaling shaft 210 to rotate, without the need to add other power sources, which is convenient for saving energy.

[0038] As another implementable way, refer to Figure 4 , a motor 230 can be set in the specific structure of the driving part, and the output shaft of the motor 230 is coaxially fixed with the descaling shaft 210. Thus, the motor 230 can be used as a power source to drive the descaling shaft 210 to rotate.

[0039] It should be noted that since the rotation speed of the motor 230 is adjustable, the rotation speed of the descaling shaft 210 can be adjusted by adjusting the rotation speed of the motor 230 to change the water flow speed in the heating cavity 100 and change the scouring force, which can not only alleviate the problem that the water scale cannot be removed due to too small scouring force, but also alleviate the problem of large wear on the heating cavity 100 and the descaling shaft 210 caused by too large scouring force.

[0040] Specifically, the heat-conducting side wall 110 can be set to have a cylindrical structure, and the descaling shaft 210 can be set to be a cylinder with spiral grooves 211. On this basis, the cylindrical heat-conducting side wall 110 and the cylindrical descaling shaft 210 can be coaxially fitted, and the radius difference between the outer circle of the descaling shaft 210 and the heat-conducting side wall 110 is set between 0.05 - 0.5 mm, such as 0.05 mm, 0.08 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, etc. Thus, not only can the water flow speed in contact with the heat-conducting side wall 110 be increased when the rotation speed of the descaling shaft 210 is determined, thereby improving the descaling effect, but also the friction force generated when the descaling shaft 210 and the heat-conducting side wall 110 rotate relative to each other can be reduced. On the one hand, the wear on the descaling shaft 210 and the heat-conducting side wall 110 during the descaling process can be reduced, and the service life of the heating cavity 100 and the descaling shaft 210 can be extended. On the other hand, the energy (such as electric energy and kinetic energy) for driving the descaling shaft 210 to rotate can be more fully utilized; usually 0.15 - 0.3 mm is selected, which can reduce the manufacturing and assembly difficulty, and not only form a water scouring force in the spiral direction, but also the water flow forms a scouring force on the heat-conducting side wall in the descaling axial direction, reducing the ability to form water scale.

[0041] Since the water scale will deposit downward under the action of its own gravity, the water scale attached to the lower part of the heat-conducting side wall 110 will be thicker. In addition, during the heating process of the heating cavity 100, there may be a situation where the water surface is lower than the top of the heating cavity 100. At this time, the thickness of the water scale formed on the part of the heat-conducting side wall 110 above the water surface will be smaller than the thickness of the water scale formed on the part of the heat-conducting side wall 110 below the water surface. Thus, during the descaling process, it is possible that the upper part of the heat-conducting side wall 110 is severely worn, while there is more residual water scale attached to the lower part of the heat-conducting side wall 110.

[0042] In this embodiment, the spiral groove 211 is set to have a structure with a gradually decreasing cross-sectional area from top to bottom to address the above problems. In this structure of the spiral groove 211, the water flow velocity in the heating cavity 100 will gradually increase from top to bottom. Thus, it can not only reduce the wear of the upper part of the heat-conducting side wall 110, but also reduce the residual water scale attached to the lower part of the heat-conducting side wall 110.

[0043] Specifically, the spiral groove 211 can change the cross-sectional area by changing the depth, or by changing the width, or by changing both the depth and the width simultaneously.

[0044] Specifically, the spiral direction of the spiral groove 211 from bottom to top is the same as the rotation direction of the descaling shaft 210. Thus, when the descaling shaft 210 rotates, the water flow in the heating cavity 100 can flow downward along the spiral groove 211, flushing the washed-off water scale to the bottom of the heating cavity 100, rather than bringing the water scale deposited at the bottom of the heating cavity 100 upward, which can reduce the wear of the heating cavity 100 and the descaling shaft 210 caused by the water scale.

[0045] Preferably, a water scale deposition cavity 400 can be added below the heating cavity 100 and the water scale deposition cavity 400 is communicated with the bottom of the heating cavity 100, so that the washed-off water scale can deposit into the water scale deposition cavity 400 under the action of its own gravity. Thus, the water scale mixed in the water in the heating cavity 100 can be reduced, and further, the wear of the heating cavity 100 and the descaling shaft 210 caused by the water scale during the high-speed flow of the water flow can be reduced.

[0046] Further, a drainage assembly 500 may be added to the steam generator provided in this embodiment. A valve is provided on the drainage assembly 500, and the drainage assembly 500 is communicated with the bottom of the scale deposition cavity 400. When the valve is opened, the scale in the scale deposition cavity 400 is discharged by using a drain pipe, so as to prevent the scale deposition cavity 400 from being filled with scale, resulting in the inability to continue receiving the scale from the heating cavity 100, so as to ensure the function of the scale deposition cavity 400, reduce the wear of the scale in the heating cavity 100 on the heating cavity 100 and the descaling shaft 210, and ensure the normal operation of the steam generator.

[0047] In addition, a coating may be attached to the inner surface of the heat-conducting side wall 110 of the heating cavity 100, and a material with a surface energy lower than that of the heat-conducting side wall 110 is selected as the material of the above coating, so that the scale is not easily adsorbed on the heat-conducting side wall 110, and the scale that has been adsorbed on the heat-conducting side wall 110 can be easily washed down.

[0048] Specifically, the above coating may be made of silicone polymer, fluorosilicone resin, fluorocarbon resin or fluororesin.

[0049] In the specific structure of the above heating cavity 100, it includes a heat-conducting cylinder body with upper and lower covers and a heating film 120. The heating film 120 is wrapped on the outer wall of the heat-conducting cylinder body for heating the heat-conducting cylinder body, and the inner wall of the heat-conducting cylinder body is the above heat-conducting side wall 110.

[0050] This embodiment also provides a steam cooking device, which includes the above steam generator. Therefore, it has all the advantages of the above steam generator, with less heat loss and high steam generation efficiency.

[0051] In summary, the present invention discloses a steam generator and a steam cooking device, which overcome many technical defects of the traditional steam generator. The steam generator and the steam cooking device provided in this embodiment have technical advantages such as less heat loss and high steam generation efficiency.

[0052] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A steam generator, characterized in that, It includes a descaling component (200) and a heating cavity (100) for containing water; Among them, the descaling component (200) includes a driving member and a descaling shaft (210). The descaling shaft (210) is installed in the heating cavity (100). A spiral groove (211) is formed on the side wall of the descaling shaft (210). The spiral groove (211) is arranged opposite to the heat-conducting side wall (110) of the heating cavity (100). The driving member is used to drive the descaling shaft (210) to rotate in the heating cavity (100); The heat-conducting side wall (110) is of a cylindrical structure. The descaling shaft (210) is a cylinder with the spiral groove (211). The heat-conducting side wall (110) and the descaling shaft (210) are coaxially fitted. The range of the radius difference between the outer circle of the descaling shaft (210) and the heat-conducting side wall (110) is 0.05 - 0.5 mm; The cross-sectional area of the spiral groove (211) gradually decreases from top to bottom.

2. The steam generator according to claim 1, wherein The driving member includes an impeller (220). The impeller (220) is coaxially fixed to the descaling shaft (210). The impeller (220) is arranged opposite to the water outlet of the water pump (300) of the steam generator. The water flow ejected from the water outlet of the water pump (300) can impact the impeller (220) to make the impeller (220) rotate.

3. The steam generator according to claim 1, characterized in that, The driving member includes a motor (230), and the output shaft of the motor (230) is coaxially fixed to the descaling shaft (210).

4. The steam generator according to any one of claims 1 to 3, characterized in that, The spiral direction of the spiral groove (211) from bottom to top is the same as the rotation direction of the descaling shaft (210).

5. The steam generator according to claim 1, characterized in that, A water scale deposition cavity (400) is arranged below the heating cavity (100). The water scale deposition cavity (400) is communicated with the bottom of the heating cavity (100).

6. The steam generator according to claim 5, characterized in that, It further includes a drainage component (500). The drainage component (500) includes a valve and a drainage pipe. The drainage pipe is communicated with the bottom of the water scale deposition cavity (400) and is used to drain the water scale in the water scale deposition cavity (400) when the valve is opened.

7. The steam generator according to any one of claims 1 to 3, characterized in that, A coating is attached to the inner surface of the heat-conducting side wall (110) of the heating cavity (100). The surface energy of the coating is lower than the surface energy of the heat-conducting side wall (110).

8. A steam cooking device, characterized in that, It includes the steam generator according to any one of claims 1 - 7.

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