Pipeline structure and steam heating device

Abstract

The present application discloses a pipeline structure and a steam heating device, the pipeline structure includes a pipe body and a steam channel arranged in the pipe body, and also includes: a mixing part, the mixing part is arranged on the pipe body, the steam channel includes a first airflow channel formed in the mixing part, the first airflow channel is used to transport steam; a second airflow channel, the second airflow channel is arranged on the mixing part, the second airflow channel is used to self-inhale a second gas; after the steam and the second gas are mixed, they are transported to the liquid or solid-liquid mixture in the cooking cavity for heating. The pipeline structure used in the present application has a mixing part, which can mix steam and the second gas, has a simple structure, low cost, good application value, obvious noise reduction effect, and good user experience.

Description

Technical Field

[0001] The present invention relates to but is not limited to the field of kitchen appliances, and in particular to a pipeline structure and a steam heating appliance. Background Art

[0002] Some existing steam cooking devices heat water into steam through a steam generating device, and the steam enters a cooking chamber through a gas pipeline. The cooking chamber is filled with water or a mixture of water and solid food (such as a rice-water mixture), and the steam is input into the water or the mixture of water and solid food for heating.

[0003] When the high-temperature steam is introduced into water or a mixture of water and solid food, a harsh noise will be emitted. Especially in the early cooking stage, the noise is particularly obvious, affecting the user experience. Summary of the invention

[0004] In order to solve the above technical problems, the embodiments of the present application provide a pipeline structure and a steam heating device, which can effectively eliminate the noise generated by the passage of high-temperature steam into water or a mixture of water and solid food, thereby improving the user experience.

[0005] In order to achieve the purpose of the application, an embodiment of the present application provides a pipeline structure, including a tube body and a steam channel arranged in the tube body, and also includes: a mixing part, the mixing part is arranged on the tube body, the steam channel includes a first air flow channel formed in the mixing part, the first air flow channel is used to transport steam; a second air flow channel, the second air flow channel is arranged on the mixing part, and the second air flow channel is used to self-inhale a second gas; after the steam is mixed with the second gas, it is transported to the liquid or solid-liquid mixture in the cooking cavity for heating.

[0006] In a possible design, the first air flow channel includes a throat section and a gradually expanding section, the throat section is connected to the gradually expanding section, and the diameter of the gradually expanding section gradually increases from one side of the throat section to a side away from the throat section.

[0007] In a possible design, the second air flow channel includes an air inlet located outside the mixing section, and an air outlet located inside the mixing section and connected to the first air flow channel, and the air outlet is located on the throat section or the gradually expanding section.

[0008] In a possible design, the pipeline structure further includes a drainage pipe, one end of which is connected to the mixing part, and the other end of which is provided with a steam outlet.

[0009] In a possible design, the first air flow channel also includes a tapered section, wherein the tapered section, the throat section and the gradually expanding section are connected in sequence, and the diameter of the tapered section gradually decreases from the side away from the throat section to the side close to the throat section.

[0010] In a possible design, the second gas forms a second airflow in the second airflow channel, and an angle between an outlet direction of the second airflow at the air outlet and a flow direction of the steam airflow in the first airflow channel forms an acute angle.

[0011] In a possible design, the cooking cavity includes a lower space below the liquid level or solid-liquid mixture level and an upper space above the liquid level, the air inlet is connected to the upper space, and the second gas is the gas in the upper space.

[0012] In a possible design, a contraction section is provided outside the mixing section, and the air inlet is arranged on the contraction section.

[0013] The present application also proposes a steam heating appliance, comprising a cooking cavity and a steam generator, including a pipeline structure as described in any one of the above items, wherein the steam generator is connected to the cooking cavity through the pipeline structure.

[0014] A possible design includes a pot cover and a pot body, and the mixing portion of the pipeline structure is arranged in the pot cover, the pot body or the cooking cavity.

[0015] Compared with the prior art, the pipeline structure of the embodiment of the present application has the following beneficial effects:

[0016] 1. The pipeline structure of the present application can transport steam for heating by transporting steam in the first air flow channel of the mixing part, and self-inhale the second gas in the second air flow channel. After the second gas is mixed with the steam, it is transported to the liquid or solid-liquid mixture in the cooking chamber for heating. The mixed air flow composed of the second gas and the steam enters the liquid or solid-liquid mixture to form countless bubbles. The outside of the bubble is liquid or solid-liquid mixture, and the gas inside is composed of high-temperature steam and the second gas. The outside of the bubble is under the pressure of the liquid or solid-liquid mixture, and the temperature difference between the inside and the outside causes the high-temperature steam in the bubble to liquefy. The volume of the bubble is reduced under the action of the external pressure and the temperature difference between the inside and the outside. Due to the presence of the second gas, the inside of the bubble can resist the external pressure and avoid the complete liquefaction of the internal gas, and can reduce the heat transfer coefficient of the bubble, thereby reducing the speed of the bubble volume reduction. When it becomes difficult to shrink the bubble, it will be more difficult for the bubble to collapse in the liquid or solid-liquid mixture, which slows down the impact released by the bubble collapse when the steam enters the liquid or solid-liquid mixture, thereby reducing the noise.

[0017] The use of this pipeline structure has the advantages of simple structure, low cost, good application value, obvious noise reduction effect and good user experience.

[0018] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained through the structures particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide further understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0020] Figure 1 A schematic diagram of a steam heating device according to a specific embodiment of the present application;

[0021] Figure 2 A schematic diagram of another steam heating device according to a specific embodiment of the present application;

[0022] Figure 3 A schematic diagram of a steam heating device in which steam is transported from bottom to top in a specific embodiment of the present application;

[0023] Figure 4 A schematic diagram of a pipe structure in a cooking cavity provided with a mixing portion in a specific embodiment of the present application;

[0024] Figure 5 A schematic diagram of a pipe structure in a pot cover having a mixing portion in a specific embodiment of the present application;

[0025] Figure 6a For this application Figure 5 Schematic diagram of the three-dimensional structure of the middle mixing section;

[0026] Figure 6b For this application Figure 5 Schematic diagram of the full cross-section structure of the middle mixing section;

[0027] Figure 7 The relationship between the radius of a single bubble and the sound pressure level in the prior art is shown in FIG.

[0028] Figure 8 This is a curve showing the relationship between the radius of a single bubble and the sound pressure level after the second gas is introduced into the specific embodiment of the present application;

[0029] Reference numerals:

[0030] 1 pot body; 11 cooking cavity; 12 pot taking and placing area; 13 machine head;

[0031] 2 Steam generator;

[0032] 3 drainage pipe; 31 steam outlet; 32 steam nozzle;

[0033] 4 mixing section; 41 first air flow channel; 42 second air flow channel; 43 mounting section; 44 contraction section; 45 upper sealing section; 46 lower sealing section; 411 gradually contracting section; 412 throat section; 413 gradually expanding section; 421 air inlet; 422 air outlet;

[0034] 5 pipeline structure; 51 pipe body, 52 steam channel; 521 lower steam channel; 522 upper steam channel; 523 butt joint;

[0035] 6 installation cavity; 61 air intake gap;

[0036] 7 liner;

[0037] 8. Pot cover. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present application more clear, the embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other arbitrarily without conflict.

[0039] This embodiment proposes a steam heating appliance, specifically a steam rice cooker, which is an application of the steam heating appliance, and other appliances may also include electric steamers, coffee machines, soy milk machines, etc., including a cooking cavity 11 and a steam generator 2, a pipe structure 5 is provided between the steam generator 2 and the cooking cavity 11, and the steam generator 2 is connected to the cooking cavity 11 through the pipe structure 5. The pipe structure 5 proposed in this application can reduce the noise during steam heating; the details are as follows.

[0040] like Figure 1-3 A steam heating device shown in the figure comprises a pot body 1 having a cooking cavity 11, a steam generator 2, a pipe structure 5 is provided between the steam generator 2 and the cooking cavity 11, the pipe structure 5 comprises a pipe body 51 and a steam channel 52 arranged in the pipe body 51, and the high-temperature steam generated by the steam generator 2 is transported to the cooking cavity 11 through the steam channel 52 in the pipe body 51. The cooking cavity 11 is used for cooking food and can contain liquid or solid-liquid mixture, and the high-temperature steam is transported to the liquid or solid-liquid mixture for heating; the liquid or solid-liquid mixture can be water, rice water mixed food, soy milk, porridge, braised pork, coffee, soup, tea, etc.; Figure 1 and Figure 4 As shown, the pipeline structure 5 of this embodiment includes a drainage pipe 3 arranged in the cooking cavity 11, the drainage pipe 3 extends from top to bottom into the cooking cavity 11, the drainage pipe 3 is provided with a steam outlet 31, the steam outlet 31 is located below the liquid level in the cooking cavity 11, and the steam is transported from top to bottom into the cooking cavity 11, so as to heat the solid or solid-liquid mixture by the high-temperature steam; Figure 1As shown, a mixing portion 4 is provided on the drainage tube 3, and the steam channel 52 includes a first air flow channel 41 formed in the mixing portion 4, and the first air flow channel 41 is used to transport steam; a second air flow channel 42 is provided on the mixing portion 4, and the second air flow channel 42 is used to self-inhale a second gas; after the steam is mixed with the second gas, it is transported to the liquid or solid-liquid mixture of the cooking cavity 11 through the drainage tube 3 for heating.

[0041] It should be noted that the present application does not specifically limit the structure of the steam heating device. The present application is a steam rice cooker, and it can also be an electric steamer, a coffee machine, an electric rice cooker, etc. In a specific embodiment, Figure 1 As shown, the steam heating device has an inner pot 7, and the cooking cavity 11 is formed in the inner pot 7. The steam heating device also includes a pot cover 8 covering the pot body 1 to close the cooking cavity 11. The drainage pipe 3 is arranged on the pot cover 8. At this time, the pipeline structure 5 includes the drainage pipe 3, a lower steam channel 521 on one side of the pot body 1 and an upper steam channel 522 on the pot cover 8, and a docking joint 523 for connecting the lower steam channel 521 and the upper steam channel 522. When the pot cover 8 is covered on the pot body 1, the upper and lower steam channels 521 are docked. When the pot cover 8 is separated from the pot body 1, the upper and lower steam channels 521 are separated. At this time, the mixing part 4 can be set at any position of the pipeline structure 5, such as in the pot body 1, in the pot cover 8, or on the drainage pipe 3. In another specific embodiment, as Figure 2 As shown, the pot body 1 is provided with a pot taking and placing area 12, the pot taking and placing area 12, the steam heating device has an inner pot 7, the inner pot 7 is placed in the pot taking and placing area 12, the pot body 1 also includes a head 13 located above the pot taking and placing area 12, the inner pot 7 is provided with a pot cover 8, the drainage pipe 3 is provided on the pot cover 8, and extends from top to bottom into the cooking cavity 11, the head 13 is connected with the pot cover 8 of the inner pot 7, the pipeline structure 5 includes channels arranged in the pot body 1, the head, and the pot cover 8, and the drainage pipe 3 in the inner pot 7, the steam sequentially passes through the above-mentioned channels and the drainage pipe 3 to send the high-temperature steam of the head 13 to below the liquid level of the food in the inner pot 7 for heating, at this time, the mixing part 4 can be arranged at any position of the pipeline structure 5, such as on the head, in the pot body 1, in the pot cover 8 or on the drainage pipe 3; of course, the steam heating device can also be other structures.

[0042] At the same time, if Figure 3As shown, the steam heating device can also be an electric steamer with bottom air intake. In a specific embodiment, it includes a cooking cavity 11 and a pipeline structure 5 arranged in the pot body 1. The upper cover of the cooking cavity 11 is provided with a pot cover 8. The pipeline structure 5 includes a channel in the pot body 1 and a steam nozzle 32 arranged on the bottom side of the cooking cavity 11. The steam nozzle 32 is provided with at least one steam outlet 31. In this case, the mixing part 4 can be arranged on the pipeline structure on the bottom side. When the steam passes through the mixing part 4 of the pipeline structure 5, the steam is mixed with the second gas and transported from bottom to top through the steam nozzle 32 into the cooking cavity to heat the liquid or solid-liquid mixture. Of course, the steam can also be transported at other positions of the cooking cavity 11, such as on the side wall, etc. The present application does not limit the structural form of how the pipeline structure 5 transports steam to the liquid or solid-liquid mixture.

[0043] In addition, the second gas transported by the mixing unit 4 may be air, or a gas that is less likely to change phase, condense or dissolve in a liquid or solid-liquid mixture than high-temperature water vapor, such as nitrogen. In actual use, the gas transported by the second gas should also be a gas that will not affect the cooking effect, taste, human health, etc. of the food. In this embodiment, air is preferred. The second gas is formed by using air, and no additional preparation is required, so the acquisition cost is low, and it will not affect the cooking effect, taste, and human health of the food. At the same time, it is not easy to change phase or condense at normal temperature and pressure.

[0044] The pipeline structure 5 of the present application can transport steam for heating by transporting steam in the first air flow channel 41 of the mixing part 4, and self-inhale the second gas in the second air flow channel 42. After the second gas is mixed with the steam, it is transported to the liquid or solid-liquid mixture in the cooking chamber 11 for heating. The mixed air flow composed of the second gas and the steam enters the liquid or solid-liquid mixture to form countless bubbles. The outside of the bubble is liquid or solid-liquid mixture, and the gas inside is composed of high-temperature steam and the second gas. The outside of the bubble is under the pressure of the liquid or solid-liquid mixture, and the temperature difference between the inside and the outside causes the high-temperature steam in the bubble to liquefy. The volume of the bubble is reduced under the action of the external pressure and the temperature difference between the inside and the outside. Due to the presence of the second gas, the inside of the bubble can resist the external pressure and avoid the complete liquefaction of the internal gas, and can reduce the heat transfer coefficient of the bubble, thereby reducing the speed of the bubble volume reduction. When it becomes difficult to shrink the bubble, it will be more difficult for the bubble to collapse in the liquid or solid-liquid mixture, which slows down the impact released by the bubble collapse when the steam enters the liquid or solid-liquid mixture, thereby reducing the noise.

[0045] The use of the pipeline structure 5 will not reduce the heating efficiency of steam cooking, will not cause heat loss, has a simple structure, low cost, good application value, obvious noise reduction effect, and good user experience.

[0046] The following is a detailed description of the noise reduction process with the accompanying drawings:

[0047] Figure 7 The relationship between the radius of a single bubble and the sound pressure level is shown in the figure, where the horizontal axis is the radius of the bubble (mm) and the vertical axis is the sound pressure level (db). Figure 7 It can be seen that as the bubble radius gradually decreases, the noise generated also gradually increases. When the bubble radius is less than 0.1 mm, that is, when the bubble is about to collapse and disappear, the noise increases sharply.

[0048] In the prior art, taking the inner tank 7 filled with room temperature water (about 23°C) as an example, when water vapor enters the room temperature water in the inner tank 7, bubbles formed by water vapor are formed in the water, and the number and size of the bubbles are related to the amount of steam input, the steam temperature, the size, number, arrangement of the steam outlet 31, and the bubble pressure. The heat of the bubbles in the water is quickly transferred to the surrounding water, the water vapor in the bubbles turns into water, and the bubbles collapse. The bubble collapse process is constantly occurring in the inner tank 7, and noise is generated when the bubbles collapse. For example, 0.1g of water vapor is input into the inner tank 7 filled with room temperature water per second, the initial diameter of each bubble is 3mm, the initial air pressure is 1 standard atmosphere, the temperature is 100°C, and all the bubbles collapse in the room temperature water. The volume of water vapor introduced per second is 0.0001675m 3 , the volume of each bubble is 0.0000000141372m 3 , the number of bubbles that collapse per second is about 11848 in steady state. Figure 7 The change curve of , because there are a large number of bubble collapses in the inner tank 7, just produces obvious noise. In fact, the bubble collapse noise in the inner tank 7 is the most obvious noise in the steam heating working process.

[0049] The steam heating device of the present application is provided with a pipe structure 5 with a mixing part 4, so that a second gas other than high-temperature steam exists inside the bubbles passed into the liquid or solid-liquid mixture, and the second gas is not easy to condense, change phase or dissolve in the liquid or solid-liquid mixture compared with the high-temperature steam. Therefore, when the steam in the bubbles is completely condensed into liquid water and only the second gas remains in the bubbles, this part of the gas will prevent the volume of the bubbles from continuing to decrease, so that the volume of the bubbles will not approach 0, thereby reducing noise and the bubble bursting sound caused by the collapse of the bubbles, thereby greatly reducing the noise emitted from the pot body 1 and improving the user experience.

[0050] like Figure 8 The curve of the relationship between the radius of a single bubble and the sound pressure level when there is 2% air in the bubble is shown. For a bubble with a diameter of 3 mm and the remaining 2% of the second gas, its volume at one atmosphere is 0.000000000282744m 3The diameter is 0.40716264mm. At this time, the remaining 2% prevents the bubble from decreasing. The diameter of the bubble is not close to 0, which reduces the noise. In general, when the bubble contains a second gas, the actual collapse of the bubble is more complicated. First, the condensation heat transfer coefficient of the bubble will decrease with the increase of the content of the second gas. Second, the bubble diameter has a repeated process of decrease-rebound-decrease during the collapse of the bubble. Experiments show that when a small amount of air is introduced into the water vapor, the noise can be significantly reduced. When the volume fraction of the introduced air reaches 2% of the water vapor, the noise is significantly reduced and is basically imperceptible to the human ear during cooking.

[0051] In addition, at the beginning of cooking, the temperature of the liquid in the cooking cavity 11 is low, the temperature difference between the steam and the liquid is large, the condensation speed is fast, and the speed of the bubbles generated by the steam entering the liquid collapsing is also fast, and the noise generated at this time is relatively large. In the prior art, in order to reduce the noise at the beginning of cooking, some steam heating appliances usually control the steam generator 2 to operate at a lower power at the beginning of cooking to reduce the condensation effect of the steam. When the temperature of the liquid in the pot rises, high-power cooking is adopted. Therefore, the amount of steam input into the cooking cavity 11 at the beginning of cooking is small, and the heating efficiency is low. However, the present application reduces the noise of the liquid collision and bubble collapse in the cooking cavity 11 by mixing gas into the steam. Therefore, the steam heating appliance of the present application reduces the limitation of power on the cooking program design, allowing the steam heating appliance to perform high-power steam heating when the temperature in the cooking cavity 11 is low at the beginning of cooking, simplifying the overall operation program and improving the heating efficiency.

[0052] As a preferred embodiment of the present application, the second airflow formed by the second gas is sucked into the first airflow channel 41 by the negative pressure generated by the steam airflow formed by the steam, such as Figure 1 , Figure 4The diagram shows a structure of the first air flow channel 41 inside the mixing section 4. Specifically, the first air flow channel 41 includes a tapered section 411, a throat section 412 and a gradually expanding section 413. The tapered section 411, the throat section 412 and the gradually expanding section 413 are connected in sequence. The diameter of the gradually expanding section 413 gradually increases from the side of the throat section 412 to the side away from the throat section 412, and the diameter of the tapered section 411 gradually decreases from the side away from the throat section 412 to the side close to the throat section 412. When the steam enters the first air flow channel 41 and passes through the throat section 412, the steam will accelerate when it flows to the throat section 412 because the diameter of the throat section 412 is smaller than the diameter of the inlet side of the first air flow channel 41. According to Bernoulli's principle, the speed of the air flow increases and the pressure decreases. At this time, a negative pressure environment is formed near the throat section 412 and the gradually expanding section 413, so that the air outside the mixing section 4 flows from the second air flow channel 42 to the first air flow channel 41 under the action of the air pressure difference, completing natural inhalation without the need to set up an additional air pumping device, thereby simplifying the internal structure of the steam heating device and contributing to miniaturization.

[0053] In addition, the steam ejected from the steam outlet 31 is subjected to water pressure, and the local pressure loss coefficient is greater than 1. Therefore, preferably, a gradually expanding section 413 is provided on the steam outlet side of the throat section 412, and the size of the gradually expanding section 413 gradually increases from the side of the throat section 412 to the side away from the throat section 412. In this way, the fluid can be gradually decelerated, the turbulence is reduced, and the pressure head loss is small. In some embodiments, the gradually contracting section 411 may not be provided, and a sudden contraction section may be provided, and the present application does not impose any restrictions on this.

[0054] The mixing portion 4 is at a preset distance from the steam outlet 31 of the drainage tube 3, which can facilitate the full mixing of the gas and the steam, and ensure that the mixed fluid is passed into the cooking cavity 11 when the second gas and the steam are completely mixed, so as to ensure that the gas and the steam are evenly mixed in the bubbles formed by the contact between the mixed fluid and the liquid, thereby avoiding stratification of the gas and the steam, affecting the quality of the mixed fluid, and further affecting the noise reduction effect.

[0055] The second airflow channel 42 includes an air inlet 421 located outside the mixing section 4, and an air outlet 422 located inside the mixing section 4 and connected to the first airflow channel 41. The external second gas is sucked in through the air inlet 421 and enters the first airflow channel 41 from the air outlet 422. The air outlet 422 is located on the throat section 412 or the gradually expanding section 413, so that the pressure of the air outlet 422 is lower than the pressure of the air inlet 421, forming a negative pressure difference, so that the second airflow is formed in the second airflow channel 42, mixed with the steam in the first airflow channel 41, and the steam is prevented from flowing out of the second airflow channel 42.

[0056] like Figure 4As shown, the angle between the outlet direction of the second airflow at the outlet 422 and the flow direction of the steam airflow in the first airflow channel 41 is an acute angle. In this embodiment, the angle between the airflow direction of the outlet 422 and the flow direction of the steam airflow is 65°. In some embodiments, the second airflow channel 42 can be tilted or bent, which is not limited. Since the angle between the outlet direction and the steam airflow is an acute angle, the flow direction of the steam airflow and the airflow direction of the second airflow do not interfere with each other, and the second airflow can enter the first airflow channel 41 more smoothly under the inertia of the steam airflow, thereby increasing the air intake and mixing effect.

[0057] like Figure 1 As shown, in this embodiment, the mixing part 4 is arranged in the pipeline structure 5 in the cooking cavity 11. Specifically, the pipeline structure 5 is a drainage pipe 3, which is detachably arranged in the pot cover 8. The mixing part 4 is located in the upper section of the drainage pipe 3 to inhale the second gas in advance. The drainage pipe 3 can be arranged integrally with the mixing part 4 or separately. The mixing part 4 has a mounting section 43 detachably connected to the pot cover 8, and is connected to the pot cover 8 through the mounting section 43. The cooking cavity 11 includes a lower space below the liquid level or solid-liquid mixture and an upper space above the liquid level. The air inlet 421 of the second air flow channel 42 is connected to the upper space, and the second gas is the gas in the upper space. During the cooking process, the upper space of the cooking cavity 11 is filled with air and steam, and the lower space is liquid or solid-liquid mixture. The upper space is located on the inner side of the cooking utensil and in the cooking cavity 11. Therefore, the temperature of the gas is higher than that of the atmosphere outside the heating utensil. Therefore, the mixing part 4 located in the cooking cavity 11 inhales the second gas from the upper space, which can reduce energy loss and improve cooking efficiency. Therefore, in this embodiment, the mixing part 4 is preferably arranged on the drainage pipe 3.

[0058] In some alternative embodiments, such as Figure 5 , 6aAs shown in 6b, the mixing part 4 is arranged on the pipeline structure 5 of the pot cover 8. In this case, the mixing part 4 can be formed separately, and the structure is simpler. Being arranged on the pipeline structure 5 of the pot cover 8 can make the mixing part 4 farther away from the steam outlet 31, so that the inhaled second gas can have sufficient time and path to mix with the steam to ensure uniform mixing and improve the noise reduction effect. At this time, in order to facilitate installation, the pot cover 8 is provided with a mounting cavity 6, and the mixing part 4 is nested in the mounting cavity 6 and docked on the pipeline structure 5 up and down. It is preferably made of flexible silicone material to facilitate the sealing between the mixing part 4 and the pipeline structure 5 or the pot cover 8 to avoid steam leakage. In order to facilitate the second gas flow channel 42 to inhale the second gas, a contraction section 44, an upper sealing section 45 and a lower sealing section 46 are provided on the outside of the mixing part 4, and the air inlet 421 is arranged on the contraction section 44. The outer diameter of the contraction section 44 is smaller than the outer diameters of the upper sealing section 45 and the lower sealing section 46 at both ends of the mixing section 4. In this way, the sealing with the mounting cavity 6 can be achieved through the upper sealing section 45 and the lower sealing section 46 at both ends of the mixing section. Through the contraction section 44 in the middle, an air intake gap 61 can be formed between the outer side of the mixing section 4 and the mounting cavity 6. There is air in the air intake gap 61, and the air inlet 421 is arranged on the air intake gap 61 to facilitate air intake.

[0059] In addition, the present application proposes a pipeline structure 5 for conveying steam, including a tube body 51 and a steam channel 52 and a mixing part 4 arranged in the tube body 51, wherein the mixing part 4 is arranged on the tube body 51, and the steam channel 52 includes a first air flow channel 41 formed in the mixing part 4, and the first air flow channel 41 is used to convey steam; a second air flow channel 42, and the second air flow channel 42 is arranged on the mixing part 4, and the second air flow channel 42 is used to convey a second gas; after the steam is mixed with the second gas, it is conveyed to the liquid or solid-liquid mixture of the cooking cavity 11 for heating.

[0060] The mixing part 4 of the pipeline structure 5 can be used to mix the second gas and the steam, and the mixed gas flow is then passed into the liquid or solid-liquid mixture for cooking, thereby achieving a noise reduction effect. In the present application, the mixing part 4 can be arranged at any position of the pipeline structure 5, and can be integrally formed with the pipe body 51 of the pipeline structure 5, or can be separately formed, such as Figure 4 As shown, the mixing part 4 is arranged on the drainage tube 3, and the drainage tube 3 is connected to the mixing part 4 by a connection method such as a thread. Figure 5 , 6a As shown in 6b, the mixing part 4 is arranged on the pipeline structure 5 in the pot cover 8, and the mixing part 4 is arranged separately; Figure 3 As shown, the mixing part 4 is disposed on the pot body 1; in some embodiments, the mixing part 4 can be a metal structure, a silicone structure or an injection molded part.

[0061] The pipe body 51 of the pipeline structure 5 can be a hose made of silicone or a hard pipe. The pipeline structure 5 can be arranged in multiple sections and connected by multiple structures. The mixer can be a butt joint of the pipeline structure 5 pieces in different sections.

[0062] In the description of this application, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0063] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0064] Although the implementation methods disclosed in this application are as above, the contents are only implementation methods adopted to facilitate understanding of this application, and are not intended to limit this application. Any technician in the field to which this application belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in this application, but the scope of patent protection of this application shall still be based on the scope defined by the attached claims.

Claims

1. A pipeline structure, comprising a pipe body and a steam channel arranged in the pipe body, characterized in that: Also includes: a mixing portion, the mixing portion being disposed on the tube body, the steam channel comprising a first air flow channel formed in the mixing portion, the first air flow channel being used for conveying steam; a second air flow channel, the second air flow channel being disposed on the mixing portion, the second air flow channel being used for self-inhalation of a second gas; After the steam is mixed with the second gas, it is transported to the liquid or solid-liquid mixture in the cooking cavity for heating.

2. The pipeline structure according to claim 1, characterized in that: The first air flow channel includes a throat neck section and a gradually expanding section, the throat neck section is connected to the gradually expanding section, and the diameter of the gradually expanding section gradually increases from one side of the throat neck section to a side away from the throat neck section.

3. The pipeline structure according to claim 2, characterized in that: The second air flow channel includes an air inlet located outside the mixing section, and an air outlet located inside the mixing section and connected to the first air flow channel, wherein the air outlet is located on the throat section or the gradually expanding section.

4. The pipeline structure according to claim 1, characterized in that: The pipeline structure also includes a drainage pipe, one end of which is connected to the mixing part, and the other end of which is provided with a steam outlet.

5. The pipeline structure according to claim 2, characterized in that: The first air flow channel also includes a tapered section, wherein the tapered section, the throat section and the gradually expanding section are connected in sequence, and the diameter of the tapered section gradually decreases from a side away from the throat section to a side close to the throat section.

6. The pipeline structure according to claim 3, characterized in that: The second gas forms a second airflow in the second airflow channel, and an angle between an outlet direction of the second airflow at the air outlet and a flow direction of the steam airflow in the first airflow channel forms an acute angle.

7. The pipeline structure according to claim 3, characterized in that: The cooking cavity comprises a lower space below the liquid level or solid-liquid mixture level and an upper space above the liquid level, the air inlet is connected to the upper space, and the second gas is the gas in the upper space.

8. The pipeline structure according to claim 3, characterized in that: A contraction section is provided outside the mixing portion, and the air inlet is arranged on the contraction section.

9. A steam heating device, characterized in that: The invention comprises a cooking cavity and a steam generator, and comprises the pipeline structure according to any one of claims 1 to 8, wherein the steam generator is connected to the cooking cavity through the pipeline structure.

10. The steam heating device according to claim 9, characterized in that: The invention comprises a pot cover and a pot body, wherein the mixing part of the pipeline structure is arranged in the pot cover, the pot body or the cooking cavity.

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