Steam generator and cooking apparatus

Abstract

The present application relates to a kind of steam generator and cooking equipment, including water tank and steam channel, heating assembly is equipped in water tank, water is heated into water vapor, water vapor flows from water tank to steam channel, flow guide cover is equipped in steam channel, the first flow channel for water vapor is formed between the inner wall of steam channel and the outer wall of flow guide cover, the radial width of flow guide cover gradually increases along the flow direction of water vapor;The present application is equipped with flow guide cover in steam channel, to block water vapor, make the moisture in water vapor adhere to the outer wall of flow guide cover, and under the action of gravity, drop to water tank, while the gas in water vapor bypasses flow guide cover, continues to flow in steam channel by the first flow channel, so as to realize water vapor separation to steam, while the radial width of flow guide cover gradually increases along the flow direction of water vapor, so as to reduce the obstruction to gas flow, so as to ensure the fluidity of gas, improve the working efficiency of the present steam generator.

Description

Technical Field

[0001] This invention relates to the field of cooking equipment technology, specifically to a steam generator and cooking equipment. Background Technology

[0002] A steam generator, also called a steam heat source machine, is a mechanical device that uses the heat energy of fuel or other energy sources to heat water into steam. Steam generators are not only an important component of steam power units, but are also widely used in household appliances such as steam ovens and those with steam cooking functions.

[0003] When steam generators are used in household appliances such as steam ovens, they typically heat water in a tank to produce steam, which then flows into the cooking chamber based on its material properties. During the steam's flow, the high moisture content not only affects its fluidity and increases its delivery time, but also negatively impacts cooking results due to the large amount of moisture entering the cooking chamber. Existing steam generators usually include a water-vapor separator to remove moisture from the steam before it enters the cooking chamber. However, this separator can also obstruct steam flow. Therefore, ensuring the steam's fluidity while simultaneously separating moisture has become a critical problem that steam generators urgently need to solve. Summary of the Invention

[0004] The present invention aims to overcome the defects in the prior art and provide a steam generator and cooking equipment that can separate water vapor from steam while ensuring the fluidity of steam.

[0005] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: a steam generator, comprising a water tank and a steam channel, wherein the water tank is provided with a heating component for heating water into steam, the steam flows from the water tank to the steam channel, the steam channel is provided with a flow guide shroud, a first flow channel for steam to pass through is formed between the inner wall of the steam channel and the outer wall of the flow guide shroud, and the radial width of the flow guide shroud gradually increases along the flow direction of the steam.

[0006] As a preferred embodiment of the present invention, the steam channel includes a conduit and a flow guide, the flow guide connecting the water tank and the conduit to guide the water vapor in the water tank into the conduit, the water vapor flowing along the conduit to the cooking chamber, and the diameter of the flow guide gradually decreasing along the direction of water vapor flow.

[0007] In a preferred embodiment of the present invention, the flow guide is located within the flow diversion shroud, and the first flow channel is formed between the inner wall of the flow diversion shroud and the outer wall of the flow guide shroud.

[0008] As a preferred embodiment of the present invention, the steam generator further includes a pressure booster disposed in the steam channel and a motor assembly for driving the pressure booster to rotate, wherein the radial width of the pressure booster decreases along the direction of water vapor flow.

[0009] In a preferred embodiment of the present invention, the steam passage forms a receiving chamber at the location of the pressurizing member, and the diameter of the receiving chamber gradually decreases along the direction of water vapor flow.

[0010] In a preferred embodiment of the present invention, the pressurizing component includes a multi-stage impeller, which is arranged along the direction of water vapor flow and has a decreasing radial width in sequence, and the motor assembly drives the multi-stage impeller to rotate synchronously.

[0011] As a preferred embodiment of the present invention, the steam channel is provided with a guide fluid, and a second flow channel for water vapor to pass through is formed between the inner wall of the steam channel and the outer wall of the guide fluid. The water vapor flows from the second flow channel to the multi-stage impeller, and the radial width of the guide fluid gradually increases along the flow direction of the water vapor.

[0012] In a preferred embodiment of the present invention, the booster includes a turbine, the radial width of which gradually decreases along the direction of water vapor flow, and the motor assembly drives the turbine to rotate.

[0013] As a preferred embodiment of the present invention, the motor assembly includes a motor and a motor cover disposed in the steam channel, the motor cover isolating the motor from the water vapor in the steam channel, and the radial width of the motor cover gradually increases along the flow direction of the water vapor.

[0014] The present invention also provides a cooking apparatus, including the steam generator described above.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: by providing a guide shroud in the steam channel to block the water vapor, the water in the water vapor adheres to the outer wall of the guide shroud and falls into the water tank under the action of gravity, while the gas in the water vapor bypasses the guide shroud and continues to flow in the steam channel through the first flow channel, thereby achieving water vapor separation of the steam. At the same time, the radial width of the guide shroud gradually increases along the flow direction of the water vapor, thereby reducing the obstruction to the gas flow, thus ensuring the flowability of the gas and improving the working efficiency of the steam generator. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a steam generator and cooking equipment according to the present invention;

[0017] Figure 2 This is a schematic diagram of another embodiment of the steam generator and cooking equipment of the present invention;

[0018] Figure 3 This is a schematic diagram of the internal structure of the steam channel of a steam generator and cooking equipment according to the present invention;

[0019] Figure 4 yes Figure 1 Enlarged view of point A in the middle;

[0020] Figure 5 yes Figure 1 Enlarged view of point B in the middle;

[0021] Reference numerals: 1. Water tank; 101. Water chamber; 2. Heating component; 3. Flow guide; 4. Water vapor separation drum; 5. Conduit; 6. Flow guide hood; 7. Multi-stage impeller; 701. First impeller; 702. Second impeller; 703. Impeller chamber; 8. Flow guide; 9. Turbine; 901. Turbine chamber; 10. Motor; 11. Shaft; 12. Motor cover. Detailed Implementation

[0022] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0023] like Figures 1-5 As shown, a steam generator includes a water tank 1 and a steam channel. The water tank 1 is provided with a heating component 2 for heating water into steam. The steam flows from the water tank 1 to the steam channel. A guide shroud 3 is provided in the steam channel. A first flow channel for steam to pass through is formed between the inner wall of the steam channel and the outer wall of the guide shroud 3. The radial width of the guide shroud 3 gradually increases along the flow direction of the steam.

[0024] In this application, the water tank 1 has a water cavity 101 for loading water. A heating component 2 is located at the bottom of the water cavity 101, heating the water in the water cavity 101 into steam. The top of the water cavity 101 is open. Due to the upward flow of hot air, the steam flows from the opening at the top of the water cavity 101 to the steam channel and then into the cooking chamber. A guide shroud 3 is provided in the steam channel, blocking the steam as it flows. Because of the density difference between gas and liquid, the moisture in the steam adheres to the outer wall of the guide shroud 3 and falls back into the water cavity 101 of the water tank 1 under gravity. Meanwhile, the gas in the steam bypasses the guide shroud 3 and continues to flow in the steam channel through the first flow channel, thus achieving water vapor separation.

[0025] Since the guide shroud 3 is located in the steam channel, it occupies part of the space for water vapor flow. Therefore, the guide shroud 3 will obstruct the flow of water vapor, increase the water vapor delivery time, and thus affect the working efficiency of the steam generator. Therefore, in this application, the radial width of the guide shroud 3 gradually increases along the direction of water vapor flow. On the one hand, it can allow the water adhering to the outer wall of the guide shroud 3 to quickly drip from the bottom of the guide shroud 3 into the water cavity 101 of the water tank 1; on the other hand, it can reduce the obstruction to the gas flow when the gas in the water vapor bypasses the guide shroud 3 and continues to flow in the steam channel through the first flow channel, thereby ensuring the flowability of the gas and improving the working efficiency of the steam generator.

[0026] In this embodiment, the steam passage includes a conduit 5 and a guide hood 6. The guide hood 6 connects the water tank 1 and the conduit 5, guiding the steam in the water tank 1 into the conduit 5. The steam flows along the conduit 5 towards the cooking chamber. The diameter of the guide hood 6 gradually decreases along the direction of steam flow. The steam passage includes the conduit 5 and the guide hood 6. The guide hood 6 is located between the water tank 1 and the conduit 5, connecting the water tank 1 and the conduit 5, allowing the steam in the water chamber 101 of the water tank 1 to flow into the conduit 5 through the guide hood 6, and then into the cooking chamber through the conduit 5. It is foreseeable that in this application, the inner diameter of the conduit 5 is smaller than the diameter of the water chamber 101 of the water tank 1. Since the guide hood 6 is used to guide the water vapor in the water chamber 101 of the water tank 1 to the conduit 5, the diameter of the guide hood 6 is set to gradually decrease along the direction of water vapor flow, so that the diameter of the guide hood 6 gradually shrinks from the end connected to the water tank 1 to the end connected to the conduit 5, thereby making the guide hood 6 better at guiding water vapor and accelerating the flow of water vapor in the steam channel.

[0027] In this embodiment, the guide shroud 3 is located within the guide shroud 6, and a first flow channel is formed between the inner wall of the guide shroud 6 and the outer wall of the guide shroud 3. As mentioned earlier, the inner diameter of the conduit 5 is smaller than the diameter of the water chamber 101 of the water tank 1. The diameter of the guide shroud 6 gradually narrows from the end connected to the water tank 1 to the end connected to the conduit 5, therefore, the diameter of part of the guide shroud 6 is larger than the inner diameter of the conduit 5. In this application, the guide shroud 3 is placed within the guide shroud 6, and a first flow channel is formed between the inner wall of the guide shroud 6 and the outer wall of the guide shroud 3. This serves two purposes: firstly, to ensure that the radial width of the guide shroud 3 is not limited by the inner diameter of the conduit 5, thereby ensuring the water-vapor separation effect; secondly, to ensure the diameter of the first flow channel, thereby ensuring the gas flowability and improving the working efficiency of this steam generator.

[0028] In this embodiment, the steam generator further includes a pressure booster disposed in the steam channel and a motor assembly for driving the pressure booster to rotate. The radial width of the pressure booster decreases along the direction of water vapor flow. The steam generator also includes a motor assembly and a pressure booster. The pressure booster is disposed in the steam channel, and the motor assembly drives the pressure booster to rotate. Because the radial width of the pressure booster decreases along the direction of water vapor flow, when the motor assembly drives the pressure booster to rotate, the pressure upstream of the pressure booster is greater, and the pressure downstream is smaller. This pressure difference between the upstream and downstream of the pressure booster creates pressure boosting, accelerating the flow of water vapor in the steam channel, further enhancing the fluidity of water vapor in the steam channel, and improving the working efficiency of the steam generator.

[0029] In this embodiment, the pressurizing component includes multi-stage impellers 7, which are arranged along the steam flow direction and have progressively decreasing radial widths. A motor assembly drives the multi-stage impellers 7 to rotate synchronously. The pressurizing component includes multi-stage impellers 7, which are disposed within the conduit 5. Steam passes through a first flow channel between the inner wall of the guide shroud 6 and the outer wall of the guide shroud 3, and then reaches the location of the multi-stage impellers 7. The multi-stage impellers 7 include at least a first impeller 701 and a second impeller 702. The motor assembly drives the first impeller 701 and the second impeller 702 to rotate synchronously. The first impeller 701 and the second impeller 702 are arranged along the steam flow direction and have progressively decreasing radial widths; that is, in the steam flow direction, the second impeller 702 is located downstream of the first impeller 701, and the diameter of the first impeller 701 is larger than the diameter of the second impeller 702.

[0030] It is foreseeable that the air delivery direction of the first impeller 701 is oriented towards the second impeller 702, forming a double impeller structure. Since the radial width of the first impeller 701 is greater than that of the second impeller 702, when the rotational speeds of the first impeller 701 and the second impeller 702 are the same, the edge linear velocity of the first impeller 701 during rotation is greater than that of the second impeller 702. This results in a greater pressure generated by the first impeller 701 than by the second impeller 702, thus creating a pressure boost through the pressure difference between the two impellers, propelling water vapor sequentially through the first impeller 701 and the second impeller 702.

[0031] During the rotation of the first impeller 701 and the second impeller 702, the rotation of the fan blades forces the water vapor to rotate, doing work on the water vapor and increasing its momentum. Under the action of the pressure difference between the first impeller 701 and the second impeller 702, the water vapor is drawn into the second impeller 702, thus allowing water vapor to continuously pass through the first impeller 701 and the second impeller 702, accelerating the flow of water vapor and achieving a speed increase of water vapor. In this application, the multi-stage impeller 7 is not limited to a double impeller structure composed of the first impeller 701 and the second impeller 702. It can also be composed of two double impeller structures consisting of the first impeller 701, the second impeller 702, a third impeller, and a fourth impeller. The specific number of impellers included in the multi-stage impeller 7 can be determined according to the actual production situation.

[0032] In this embodiment, the steam passage forms a receiving chamber at the location of the pressurizing component. When the multi-stage impeller 7 is used for pressurization, the receiving chamber is the impeller chamber 703 formed by the conduit 5 at the location of the multi-stage impeller 7. The impeller chamber 703 is located around the multi-stage impeller 7, and the diameter of the impeller chamber 703 gradually decreases along the flow direction of water vapor in the conduit 5. On the one hand, it guides the water vapor in the conduit 5 to the location of the multi-stage impeller 7 more quickly, thereby accelerating the flow of water vapor in the conduit 5; on the other hand, the impeller chamber 703, together with the multi-stage impeller 7, forms a pressurization, better promoting the flow of water vapor in the conduit 5, thereby further ensuring the flowability of the gas and improving the working efficiency of this steam generator.

[0033] In this embodiment, a guide fluid 8 is provided in the steam channel. A second flow channel for water vapor to pass through is formed between the inner wall of the steam channel and the outer wall of the guide fluid 8. The water vapor flows from the second flow channel to the multi-stage impeller 7. The radial width of the guide fluid 8 gradually increases along the flow direction of the water vapor. Multiple flow channels are provided in the steam channel along the flow direction of the water vapor. The first flow channel is formed between the inner wall of the guide shroud 6 and the outer wall of the guide shroud 3. The water vapor in the water tank 1 is blocked by the guide shroud 3. The water vapor in the water vapor adheres to the outer wall of the guide shroud 3 and falls into the water cavity 101 of the water tank 1 under the action of gravity. The gas in the water vapor bypasses the guide shroud 3 and continues to flow in the steam channel through the first flow channel, performing the first water vapor separation.

[0034] The second flow channel is formed between the inner wall of the conduit 5 and the outer wall of the guide fluid 8. Water vapor continuing to flow through the steam channel via the first flow channel is blocked by the guide fluid 8, causing residual moisture in the water vapor to adhere to the outer wall of the guide fluid 8 and fall into the water chamber 101 of the water tank 1 under gravity. Meanwhile, the gas in the water vapor bypasses the guide fluid 8 and flows through the second flow channel to the multi-stage impeller 7 for a second water vapor separation, further ensuring the effectiveness of water vapor separation. The water vapor flowing towards the multi-stage impeller 7 is pressurized by the impeller 7, accelerating its flow in the steam channel, thereby enhancing gas flowability and improving the working efficiency of the steam generator.

[0035] In this application, a water vapor separation drum 4 is also provided in the steam passage. The water vapor separation drum 4 has an internal cavity with an open top. Multiple through holes are provided on the outer wall of the water vapor separation drum 4 to connect the cavity to the outside. The motor assembly drives the water vapor separation drum 4 to rotate. It is foreseeable that a third flow channel is also provided between the inner wall of the duct 5 and the outer wall of the water vapor separation drum 4. When the water vapor in the steam passage is pressurized by the multi-stage impeller 7, it flows to the third flow channel and then enters the cavity of the water vapor separation drum 4 through the through holes on the outer wall of the water vapor separation drum 4.

[0036] When the motor assembly drives the water vapor separation drum 4 to rotate, the centrifugal force generated by the water vapor separation drum 4 throws the water vapor entering the water vapor separation drum 4 away from the axis of the water vapor separation drum 4. Due to the difference in density between gas and liquid, the centrifugal force on the liquid is greater than that on the gas. Therefore, the water in the water vapor will be thrown towards the inner wall of the water vapor separation drum 4 and adhere to the inner wall of the water vapor separation drum 4. Under the action of gravity, it drips into the water cavity 101 of the water tank 1, while the gas in the water vapor continues to flow in the steam channel through the opening at the top of the cavity of the water vapor separation drum 4, thereby further ensuring the water vapor separation effect.

[0037] In this embodiment, the pressurizing component includes a turbine 9, the radial width of which gradually decreases along the flow direction of water vapor, and the motor assembly drives the turbine 9 to rotate. In this application, the pressurizing component can also be a turbine 9 disposed in the conduit 5, the radial width of which gradually decreases along the flow direction of water vapor, thus forming a structure that is wider at the bottom and narrower at the top. When the turbine 9 is used for pressurization, the receiving chamber formed in the steam passage at the location of the pressurizing component is the turbine chamber 901 formed in the conduit 5 at the location of the turbine 9. The turbine chamber 901 is located around the turbine 9, and the diameter of the turbine chamber 901 gradually decreases along the flow direction of water vapor in the conduit 5. Therefore, when the motor assembly drives the turbine 9 to rotate, the cooperation between the turbine chamber 901 and the turbine 9 results in a higher upstream pressure and a lower downstream pressure for the turbine 9, thereby creating pressurization to achieve water vapor injection and accelerate the flow of water vapor in the conduit 5.

[0038] In this application, the number of turbines 9 is set according to actual needs. Multi-stage turbines are arranged in the duct 5 along the steam flow direction. Under the action of the multi-stage turbines, multi-stage pressurization of the steam can be achieved. It is foreseeable that the pressurization method using multi-stage impellers 7 and turbines 9 in this application can be used individually or in combination. When multi-stage impellers 7 and turbines 9 are used in combination, the guide vane 8, multi-stage impellers 7, steam-water separation drum 4, and turbines 9 can be arranged sequentially in the duct 5 along the steam flow direction. The steam entering the duct 5 first flows through the second flow channel between the inner wall of the duct 5 and the outer wall of the guide vane 8, towards the multi-stage impeller 7. After acceleration by the multi-stage impeller 7, the steam enters the steam-water separation drum 4 through the third flow channel. After steam-water separation by the steam-water separation drum 4, the steam flows through the steam-water separation drum 4 towards the turbine 9, where the turbine 9 further accelerates the steam, thereby ensuring the fluidity of the steam and improving the working efficiency of this steam generator.

[0039] Example 1:

[0040] The motor assembly includes a motor 10, a rotating shaft 11, and a motor housing 12. The motor 10 is located inside the duct 5. The multi-stage impeller 7, the water vapor separation drum 4, the turbine 9, and the motor 10 are arranged sequentially along the flow direction of the water vapor in the duct 5, and the motor 10, turbine 9, water vapor separation drum 4, and multi-stage impeller 7 are located on the same vertical line. The rotating shaft 11 simultaneously connects the motor 10 with the turbine 9, water vapor separation drum 4, and multi-stage impeller 7, so that when the motor 10 rotates, the rotating shaft 11 simultaneously drives the turbine 9, water vapor separation drum 4, and multi-stage impeller 7 to rotate. When the water vapor flows in the duct 5, the multi-stage impeller 7 initially pressurizes the water vapor, thereby accelerating the flow of the water vapor in the duct 5 and causing the water vapor to quickly enter the water vapor separation drum 4. After passing through the water vapor separation drum 4, the water vapor, under the action of the turbine 9, converts the kinetic energy of the turbine 9 into the pressure energy of the water vapor, thereby accelerating the ejection of the water vapor.

[0041] The motor cover 12 surrounds the motor 10 to isolate the motor 10 from the water vapor in the conduit 5, preventing the water vapor in the conduit 5 from contacting the motor 10, thereby protecting the motor 10 and reducing the corrosion caused by water vapor. At the same time, the water vapor is separated by the water vapor separation roller 4, the guide shroud 3, and the guide fluid 8, ensuring that the water vapor reaching the motor 10 contains less moisture, thus providing better protection for the motor 10.

[0042] Example 2:

[0043] Compared to Embodiment 1, in Embodiment 2, the motor 10 is positioned below the water chamber 101 of the water tank 1. The multi-stage impeller 7, water vapor separation drum 4, and turbine 9 are arranged sequentially along the steam flow direction in the duct 5, with the motor 10, turbine 9, water vapor separation drum 4, and multi-stage impeller 7 on the same vertical line. The rotating shaft 11 connects the motor 10 to the turbine 9, water vapor separation drum 4, and multi-stage impeller 7 simultaneously, so that when the motor 10 rotates, the rotating shaft 11 simultaneously drives the turbine 9, water vapor separation drum 4, and multi-stage impeller 7 to rotate. When the steam flows in the duct 5, the multi-stage impeller 7 initially pressurizes the steam, accelerating its flow and allowing it to quickly enter the water vapor separation drum 4. After passing through the water vapor separation drum 4, the steam, under the action of the turbine 9, converts the kinetic energy of the turbine 9 into the pressure energy of the steam, thus accelerating the steam ejection.

[0044] Since the motor 10 is located below the water chamber 101 of the water tank 1, there is no possibility of it coming into contact with water vapor. Therefore, there is no need to install a motor cover 12 on the outside of the motor 10. The motor 10 has better anti-interference performance in actual use. However, in this way, there may be gaps between the guide cover 3, the guide fluid 8 and the rotating shaft 11. Water vapor can easily flow through these gaps to the water vapor separation drum 4, affecting the overall water vapor separation effect.

[0045] This embodiment also provides a cooking device, including the steam generator described above.

[0046] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention; therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0047] Although this document frequently uses reference numerals from the accompanying drawings, such as water tank 1, water chamber 101, heating assembly 2, guide shroud 3, water-vapor separation drum 4, duct 5, guide shroud 6, multi-stage impeller 7, first impeller 701, second impeller 702, impeller chamber 703, guide fluid 8, turbine 9, turbine chamber 901, motor 10, shaft 11, and motor cover 12, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

Claims

1. A steam generator, characterized by: The steam generator comprises a water tank (1) and a steam passage, the water tank (1) is provided with a heating assembly (2) for heating water into steam, the steam flows from the water tank (1) to the steam passage, the steam passage is provided with a flow guide cover (3), a first flow channel for the steam is formed between the inner wall of the steam passage and the outer wall of the flow guide cover (3), the radial width of the flow guide cover (3) gradually increases along the flow direction of the steam. The steam passage comprises a guide pipe (5) and a flow guide cover (6), the flow guide cover (6) connects the water tank (1) and the guide pipe (5) to guide the steam in the water tank (1) to the guide pipe (5), the steam flows along the guide pipe (5) to a cooking cavity, the caliber of the flow guide cover (6) gradually decreases along the flow direction of the steam.

2. A steam generator as claimed in claim 1, wherein: The flow guide cover (3) is located in the flow guide cover (6), a first flow channel is formed between the inner wall of the flow guide cover (6) and the outer wall of the flow guide cover (3).

3. A steam generator as claimed in claim 1, wherein: The steam generator further comprises a booster in the steam passage and a motor assembly for driving the booster to rotate, the radial width of the booster gradually decreases along the flow direction of the steam.

4. A steam generator as claimed in claim 3, wherein: The steam passage forms an accommodation cavity at the position of the booster, the caliber of the accommodation cavity gradually decreases along the flow direction of the steam.

5. A steam generator as claimed in claim 3, wherein: The booster comprises a multi-stage impeller (7), the multi-stage impeller (7) is arranged along the flow direction of the steam and the radial width gradually decreases, the motor assembly drives the multi-stage impeller (7) to rotate synchronously.

6. A steam generator as claimed in claim 5, wherein: The steam passage is provided with a flow guide body (8), a second flow channel for the steam is formed between the inner wall of the steam passage and the outer wall of the flow guide body (8), the steam flows from the second flow channel to the multi-stage impeller (7), the radial width of the flow guide body (8) gradually increases along the flow direction of the steam.

7. A steam generator as claimed in claim 3, wherein: The booster comprises a turbine (9), the radial width of the turbine (9) gradually decreases along the flow direction of the steam, the motor assembly drives the turbine (9) to rotate.

8. A steam generator as claimed in claim 3, wherein: The motor assembly comprises a motor (10) and a motor cover (12) in the steam passage, the motor cover (12) isolates the motor (10) from the steam in the steam passage, the radial width of the motor cover (12) gradually increases along the flow direction of the steam.

9. A cooking apparatus, characterized by, The steam generator according to any one of claims 1-8.

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