A pressure cooker and pressure release device thereof

Abstract

The invention discloses a pressure cooker and a pressure release device thereof. The pressure release device comprises a centrifugal impeller and an upper cover. The centrifugal impeller can rotate around a preset axis. The centrifugal impeller comprises a bottom plate, blades arranged on a main surface of one side of the bottom plate, and a first guide ring arranged on a side of the blade away from the bottom plate. The upper cover is arranged on a side of the blade away from the bottom plate. The upper cover comprises a second guide ring. The second guide ring is located on the inner side of the first guide ring along the radial direction of the axis, and the projections of the second guide ring and the first guide ring on the axis overlap, so that the gas-liquid mixture flows to the blades through the first guide ring and the second guide ring, thereby achieving gas-liquid separation through the centrifugal force generated by the rotating blades. The invention enables the centrifugal impeller and the upper cover to achieve gas-liquid separation in the process of rotating to release pressure, so that the pressure release device can continuously exhaust gas to release pressure, effectively shortening the opening time of the pressure cooker, and having high safety.

Description

Technical Field

[0001] The invention relates to the technical field of kitchen appliances, and in particular to a pressure cooker and a pressure release device thereof. Background Art

[0002] The pressure cooker uses the principle that liquids have a higher boiling point under higher pressure to apply pressure to the water in the pressure cooker, so that the water can reach a higher temperature without boiling, which can speed up the cooking of ingredients and save cooking time. After cooking, it is usually necessary to release the pressure inside the pressure cooker so that the pressure inside the pressure cooker is the same as the external atmospheric pressure to avoid the risk of scalding caused by food overflowing.

[0003] The inventor of the present application has found in the long-term research and development that during the process of releasing the pressure of the pressure release device of the pressure cooker, the pressure in the pressure cooker is rapidly reduced, which will cause the temperature of the liquid in the pressure cooker to be higher than its boiling point, and part of the liquid will be vaporized. When the liquid has a certain viscosity, the gas formed by the vaporization expands from the inside of the liquid, and bubbles will be generated. The liquid or solid particles on the bubbles will be ejected with the gas, affecting the safety and cleanliness of the pressure cooker. At present, the pressure in the pressure cooker is mainly reduced by intermittent exhaust or cooling the temperature in the pressure cooker, which takes a long time to open the lid. Summary of the invention

[0004] The present invention provides a pressure cooker and a pressure release device thereof, so as to solve the technical problem in the prior art that liquid and / or solid are prone to gaseous spraying during the pressure release process of the pressure cooker, causing potential safety hazards and inconvenience in cleaning.

[0005] In order to solve the above technical problems, a technical solution adopted by the present invention is to provide a pressure release device, comprising:

[0006] A centrifugal impeller, the centrifugal impeller can rotate around a preset axis, the centrifugal impeller comprises a bottom plate, blades arranged on a main surface of one side of the bottom plate, and a first guide ring arranged on a side of the blade away from the bottom plate;

[0007] An upper cover is arranged on a side of the blade away from the bottom plate, and the upper cover includes a second guide ring, which is located on the inner side of the first guide ring along the radial direction of the axis, and the second guide ring and the first guide ring have partially overlapped projections on the axis, so that the gas-liquid mixture flows between the first guide ring and the second guide ring to the blade, thereby achieving gas-liquid separation through the centrifugal force generated by the rotating blades.

[0008] In a specific embodiment, the gas-liquid mixture further flows directly toward the blades in a radial direction of the axis.

[0009] In a specific embodiment, the upper cover further includes a main body plate and an air outlet arranged on the main body plate, the second guide ring is arranged on the main surface of the main body plate on one side facing the centrifugal impeller, the gas of the gas-liquid mixture after gas-liquid separation is discharged from the air outlet, and the liquid after gas-liquid separation is discharged along the circumference of the centrifugal impeller.

[0010] In a specific embodiment, the upper cover further includes a third guide ring arranged on the main surface of the main plate, the third guide ring is located on the outside of the first guide ring along the radial direction of the axis, and the projections of the third guide ring and the first guide ring on the axis overlap, so that the gas-liquid mixture first passes between the third guide ring and the second guide ring, and then flows between the first guide ring and the second guide ring to the blades.

[0011] In a specific embodiment, an overlapping length of projections of the third guide ring and the first guide ring on the axis is greater than an overlapping length of projections of the second guide ring and the first guide ring on the axis.

[0012] In a specific embodiment, the distance between the second guide ring and the third guide ring is 1 mm to 5 mm, and the distance between the first guide ring and the main plate is 1 mm to 5 mm.

[0013] In a specific embodiment, the blades are in plural number and are arranged at circumferential intervals around the axis in an annular region centered on the axis.

[0014] In a specific embodiment, the upper cover further includes a fourth guide ring arranged on the main surface of the main plate, the fourth guide ring is located on the inner side of the blade along the radial direction of the axis, and the fourth guide ring and the projection portion of the blade on the axis overlap, and the fourth guide ring is used to block the gas-liquid mixture flowing between the first guide ring and the second guide ring from being directly output from the gas outlet.

[0015] In a specific embodiment, the number of the blades is 3 to 60, and the outer edges of the blades are located outside the base plate. The pressure release device further includes a driving mechanism, which is used to drive the centrifugal impeller to rotate around the axis.

[0016] To solve the above technical problems, another technical solution adopted by the present invention is to provide a pressure cooker, comprising a cooker body, a cooker cover and the above pressure release device, wherein the cooker cover is arranged on the cooker body, and the pressure release device is arranged on the cooker cover.

[0017] The present invention provides a pressure release device including a centrifugal impeller and an upper cover. The centrifugal impeller and the upper cover can cooperate with each other in structure so that gas-liquid separation is achieved during the process of the centrifugal impeller and the upper cover rotating to release pressure, so that the pressure release device can continuously exhaust gas to release pressure, effectively shortening the opening time of the pressure cooker and having higher safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0019] Figure 1 It is a three-dimensional structural schematic diagram of a pressure release device and a pot cover in an embodiment of a pressure release device of the present invention;

[0020] Figure 2 is a schematic cross-sectional structural diagram of a pressure release device and a pot cover in an embodiment of a pressure release device of the present invention;

[0021] Figure 3 is a schematic cross-sectional view of an embodiment of a pressure release device of the present invention;

[0022] Figure 4 It is a schematic diagram of the three-dimensional structure of a centrifugal impeller in an embodiment of a pressure release device of the present invention;

[0023] Figure 5 is a schematic diagram of the main structure of a centrifugal impeller in an embodiment of a pressure release device of the present invention;

[0024] Figure 6 is a schematic diagram of a top view of a centrifugal impeller in an embodiment of a pressure release device of the present invention;

[0025] Figure 7 It is a schematic diagram of the partial structure of a centrifugal impeller in an embodiment of a pressure release device of the present invention;

[0026] Figure 8 It is a schematic diagram of the three-dimensional structure of the upper cover in one embodiment of the pressure release device of the present invention;

[0027] Fig. 9 is a schematic diagram of the three-dimensional structure of a pressure release device and a pot cover in another embodiment of the pressure release device of the present invention;

[0028] Fig.10 is a schematic diagram of the main structure of a pressure release device and a pot cover in another embodiment of the pressure release device of the present invention;

[0029] Fig.11is a schematic cross-sectional view of another embodiment of the pressure release device of the present invention;

[0030] Fig.12 is a schematic cross-sectional view of another embodiment of the pressure release device of the present invention;

[0031] Fig.13 is a schematic diagram of the three-dimensional structure of a centrifugal impeller in another embodiment of the pressure release device of the present invention;

[0032] Fig.14 is a schematic diagram of the main structure of a centrifugal impeller in another embodiment of the pressure release device of the present invention;

[0033] Fig.15 is a schematic diagram of a top view of a centrifugal impeller in another embodiment of the pressure release device of the present invention;

[0034] Fig.16 is a schematic diagram of the three-dimensional structure of a cover shell in another embodiment of the pressure release device of the present invention;

[0035] Fig.17 is a schematic cross-sectional structural diagram of a cover shell in another embodiment of the pressure release device of the present invention;

[0036] Fig.18 is a schematic diagram of the main structure of the upper cover in another embodiment of the pressure release device of the present invention;

[0037] Fig.19 is a schematic cross-sectional structural diagram of an upper cover in another embodiment of the pressure release device of the present invention;

[0038] Fig. 20 is a schematic diagram of the three-dimensional structure of an upper cover in another embodiment of the pressure release device of the present invention;

[0039] Fig.21 is a schematic diagram of the three-dimensional structure of a pressure release device and a pot cover in another embodiment of the pressure release device of the present invention;

[0040] Fig. 22 is a schematic diagram of the main structure of a pressure release device and a pot cover in another embodiment of the pressure release device of the present invention;

[0041] Fig.23 is a schematic cross-sectional view of another embodiment of the pressure release device of the present invention;

[0042] Fig.24 is a schematic cross-sectional view of another embodiment of the pressure release device of the present invention;

[0043] Fig.25 is a schematic diagram of the three-dimensional structure of a pressure release device and a pot cover in another embodiment of the pressure release device of the present invention;

[0044] Fig.26 is a schematic cross-sectional view of another embodiment of the pressure release device of the present invention;

[0045] Fig. 27 is a schematic diagram of the main structure of an anti-blocking cover in another embodiment of the pressure release device of the present invention;

[0046] Fig.28 is a schematic cross-sectional structural diagram of an anti-blocking cover in another embodiment of the pressure release device of the present invention;

[0047] Fig.29 is a schematic diagram of a top view of an anti-blocking cover in another embodiment of the pressure release device of the present invention;

[0048] Fig.30 It is a three-dimensional structural schematic diagram of a pressure cooker embodiment of the present invention. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] The terms "first" and "second" in this application are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically limited. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices. The term "and / or" is only a kind of association relationship describing associated objects, indicating that three relationships can exist, for example, A and / or B can be represented: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are a kind of "or" relationship.

[0051] See also Figures 1 to 6An embodiment of the pressure release device 10 of the present invention includes a centrifugal impeller 100 and an upper cover 200. The centrifugal impeller 100 can rotate around a preset axis. The centrifugal impeller 100 includes a bottom plate 110, blades 120 arranged on a main surface of one side of the bottom plate 110, and a first guide ring 130 arranged on a side of the blade 120 away from the bottom plate 110; the upper cover 200 is arranged on a side of the blade 120 away from the bottom plate 110, and the upper cover 200 includes a second guide ring 220. The second guide ring 220 is located on the inner side of the first guide ring 130 along the radial direction of the axis, and the projections of the second guide ring 220 and the first guide ring 130 on the axis partially overlap, so that the gas-liquid mixture flows to the blades through the first guide ring 130 and the second guide ring 220, thereby realizing gas-liquid separation through the centrifugal force generated by the rotating blades 120.

[0052] The present invention provides a pressure release device 10 including a centrifugal impeller 100 and an upper cover 200. The centrifugal impeller 100 and the upper cover 200 can achieve gas-liquid separation during the rotation of the centrifugal impeller 100 and the upper cover 200 for pressure release, thereby enabling the pressure release device to continuously exhaust air to release pressure, effectively shortening the opening time of the pressure cooker and achieving higher safety.

[0053] In this embodiment, the pressure release device 10 may further include a rotating shaft 140, on which the centrifugal impeller 100 and the upper cover 200 are sleeved, and the centrifugal impeller 100 can rotate with the rotating shaft 140. In other embodiments, the centrifugal impeller 100 may also rotate relative to the rotating shaft 140, which is not limited here.

[0054] In this embodiment, the main surface of the bottom plate 110 is a plane, and the blades 120 are further arranged perpendicular to the main surface. There are multiple blades 120, and the blades 120 are arranged at circumferential intervals around the axis in an annular region centered on the axis.

[0055] In this embodiment, the blades 120 are arranged in an arc shape along the radial direction of the axis. Figure 7 , the liquid droplets 30 in the gas-liquid mixture are not only subjected to the tangential force of the blade 120, but also to the radial force of the blade 120, as follows:

[0056] The mass of droplet 30:

[0057]

[0058] Wherein, ρ is the density of the droplet 30, b is the thickness of the droplet 30, r is the distance from the droplet 30 to the axis, is the differential angle corresponding to the droplet 30 , and dr is the differential radius of the droplet 30 .

[0059] The centrifugal force on the droplet 30 is:

[0060]

[0061] Here, ω is the angular velocity of the centrifugal impeller 100 .

[0062] The area of ​​force acting on the droplet 30 is:

[0063]

[0064] Then the centrifugal force per unit area of ​​the droplet 30, that is, the radial pressure difference of the blade 120 on the droplet 30 along the axis is:

[0065] dp=dF / dA=ρ*r*ω 2 *dr (4).

[0066] Therefore, the liquid droplets 30 can overcome the radial pressure difference along the axis and be thrown out of the centrifugal impeller 100, thereby achieving better gas-liquid separation.

[0067] In this embodiment, the curvature β of the blade 120 is 15° to 65°, for example, 15°, 30° or 65°.

[0068] In this embodiment, the ratio of the radial length of the blade 120 along the axis to the maximum spacing between two adjacent blades 120 is greater than 0.2, such as 0.4, 0.5 or 1.

[0069] In this embodiment, the gas-liquid mixture can further flow directly toward the blades 120 along the radial direction of the axis, so as to achieve gas-liquid separation by the centrifugal force generated by the rotating blades 120 .

[0070] See also Figure 8 In this embodiment, the upper cover 200 further includes a main body plate 210 and an air outlet 211 arranged on the main body plate 210. The second guide ring 220 is arranged on the main surface of the main body plate 210 on one side facing the centrifugal impeller 100. The gas of the gas-liquid mixture after gas-liquid separation enters the space surrounded by the blades 120 from between the first guide ring 130 and the second guide ring 220 and between the multiple blades 120, and is discharged from the air outlet 211. Under the action of the centrifugal force generated by the blades 120, the liquid after gas-liquid separation is discharged along the circumference of the centrifugal impeller 100, thereby realizing gas-liquid separation.

[0071] In this embodiment, the upper cover 200 further includes a third guide ring 230 arranged on the main surface of the main plate 210, and the third guide ring 230 is located on the outside of the first guide ring 130 along the radial direction of the axis, and the projections of the third guide ring 230 and the first guide ring 130 on the axis partially overlap, so that the gas-liquid mixture first passes between the third guide ring 230 and the second guide ring 220, and then flows between the first guide ring 130 and the second guide ring 220 to the blade 120.

[0072] In this embodiment, the overlapping length of the projections of the third guide ring 230 and the first guide ring 130 on the axis is greater than the overlapping length of the projections of the second guide ring 220 and the first guide ring 130 on the axis.

[0073] In this embodiment, the distance between the second guide ring 220 and the third guide ring 230 may be 1 mm to 5 mm, such as 1 mm, 3 mm or 5 mm. The distance between the first guide ring 130 and the main plate 210 may be 1 mm to 5 mm, such as 1 mm, 2 mm or 5 mm.

[0074] In this embodiment, the upper cover 200 further includes a fourth guide ring 240 arranged on the main surface of the main plate 210, the fourth guide ring 240 is located on the inner side of the blade 120 along the radial direction of the axis, and the projections of the fourth guide ring 240 and the blade 120 on the axis partially overlap, and the fourth guide ring 240 is used to block the gas-liquid mixture flowing between the first guide ring 130 and the second guide ring 220 from being directly output from the outlet 211.

[0075] In this embodiment, the number of blades 120 can be 3 to 60, for example 3, 10 or 60, and the outer edge of the blade 120 is located on the outside of the base plate 110. The pressure release device 10 further includes a driving mechanism (not shown in the figure), which is used to drive the centrifugal impeller 100 to rotate around the axis.

[0076] In this embodiment, the ratio of the radial length of the blade 120 along the axis to the radial distance between the inner ring of the annular region and the axis along the axis is 0.1 to 0.5, such as 0.1, 0.2 or 0.5.

[0077] In this embodiment, the radial distance between the inner ring of the annular area and the axis can be greater than or equal to 7.5 mm, such as 7.5 mm, 10 mm or 15 mm, which can generate a larger centrifugal force at a constant rotation speed.

[0078] In this embodiment, the pressure release device 10 may further include a sealing ring 150 , which is disposed at the connection between the centrifugal impeller 100 and the upper cover 200 .

[0079] See also Figure 3Specifically, when the pressure cooker needs to release the pressure, the driving mechanism drives the centrifugal impeller 100 to rotate around the axis. At this time, a part of the gas-liquid mixture in the pressure cooker directly flows to the blade 120 along the radial direction of the axis, and the other part flows between the third guide ring 230 and the first guide ring 130, and then flows to the blade 120 between the first guide ring 130 and the second guide ring 220. Under the action of the centrifugal force generated by the rotation of the blade 120, the gas-liquid mixture flowing to 120 through the two paths is separated into gas and liquid, wherein the gas continues to flow into the inside of the centrifugal impeller 100 and is discharged through the gas outlet 211; the liquid is directly discharged back into the pressure cooker along the circumferential direction of the centrifugal impeller 100.

[0080] See also Figures 9 to 12 Another embodiment of the pressure release device 10 of the present invention includes a centrifugal impeller 300 and a cover 400. The centrifugal impeller 300 can rotate around a preset axis. The cover 400 is arranged on the periphery of the centrifugal impeller 300 to form an isolation chamber 410. The cover 400 is provided with a guide portion 420 corresponding to the centrifugal impeller 300. One end of the guide portion 420 is connected to the isolation chamber 410, and the other end is connected to the outside of the cover 400. Under the action of the internal and external pressure difference of the cover 400, the gas-liquid mixture flows into the isolation chamber 410 through the guide portion 420 and acts on the centrifugal impeller 300, thereby driving the centrifugal impeller 300 to rotate to achieve gas-liquid separation of the gas-liquid mixture.

[0081] The embodiment of the present invention is provided with a centrifugal impeller 300, which can realize gas-liquid separation during the pressure release process through the rotation of the centrifugal impeller 300, so that the pressure release device 10 can continuously exhaust gas to release pressure, effectively shortening the opening time of the pressure cooker, and having high safety. By providing a cover 400 to cover the centrifugal impeller 300 in a closed space, and driving the centrifugal impeller 300 through the pressure difference between the guide part 420 and the inside and outside of the cover 400, the driving mechanism can be omitted, the structure is simple and easy to implement, and a large amount of cost can be saved.

[0082] See also Figures 13 to 15 In this embodiment, the centrifugal impeller 300 includes a base plate 310, a first blade 320 and a second blade 330. The first blade 320 is arranged on a main surface of one side of the base plate 310, and is used to generate centrifugal force during the rotation of the centrifugal impeller 300 to separate the gas and liquid of the gas-liquid mixture; the second blade 330 protrudes from the outer periphery of the base plate 310 along the radial direction of the axis, and the gas-liquid mixture acts on the second blade 330 to rotate the centrifugal impeller 300.

[0083] In this embodiment, the guide portion 420 may be a tubular nozzle, the outlet of the nozzle is directly opposite to the groove of the second blade 330 , and the extending direction of the nozzle is tangent to the outer circumference of the bottom plate 310 .

[0084] In other embodiments, the guide portion 420 may also be one or more through holes (not shown in the figure) with a smaller cross-sectional area arranged on the cover shell 400, the through holes facing the groove of the second blade 330, and the gas-liquid mixture can flow quickly to the second blade 330 through the through holes; or the guide portion 420 may also be a column or cantilever arranged in the cover shell 400, the interior of the column or cantilever is a cavity, and one or more through holes are arranged on the surface, the through holes facing the groove of the second blade 330, and the gas-liquid mixture can flow quickly to the second blade 330 through the through holes.

[0085] In this embodiment, the number of the second blades 330 is less than the number of the first blades 320, and the second blades 330 are connected to some of the first blades 320. The number of the first blades 320 can be 3 to 60, and the number of the second blades 330 can be 3 to 20, such as 3, 10 or 20.

[0086] In this embodiment, each second blade 330 is respectively connected to at least two first blades 320 that are adjacently arranged along the circumferential direction of the axis.

[0087] See also Figures 16 to 20 In this embodiment, the centrifugal impeller 300 may further include a first guide ring 340 arranged on the side of the first blade 320 away from the bottom plate 310, the pressure release device 10 further includes an upper cover 500, the upper cover 500 is arranged on the side of the first blade 320 away from the bottom plate 310, the cover shell 400 is connected to the upper cover 500 so that the centrifugal impeller 300 is accommodated in the isolation chamber 410, the upper cover 500 includes a main plate 510 and a second guide ring 520 arranged on the main surface of the main plate 510, the second guide ring 520 is located on the inner side of the first guide ring 340 along the radial direction of the axis, so that the gas-liquid mixture flows to the first blade 320 through the first guide ring 340 and the second guide ring 520, thereby realizing gas-liquid separation through the centrifugal force generated by the rotating first blade 320.

[0088] The structures of the first guide ring 340 and the upper cover 500 refer to the first guide ring 130 and the upper cover 200 in the above-mentioned pressure release device 10, and will not be described in detail here.

[0089] In this embodiment, an outer circumference of the main body plate 510 of the upper cover 500 is provided with an external thread 530 , and an inner circumference of the top of the cover shell 400 is provided with an internal thread 440 . The external thread 530 cooperates with the internal thread 440 to achieve the connection between the upper cover 500 and the cover shell 400 .

[0090] In this embodiment, the bottom 430 of the housing 400 is configured in a conical shape, so that the liquid on the bottom 430 of the housing 400 gathers toward the outer edge of the bottom 430 of the housing 400 .

[0091] See also Figure 21 to Figure 24 Another embodiment of the pressure release device 10 of the present invention includes a centrifugal impeller 300, an upper cover 500 and a cover shell 600, wherein the structures of the centrifugal impeller 300 and the upper cover 500 refer to the centrifugal impeller 300 and the upper cover 500 in the above-mentioned embodiment of the pressure release device 10, and are not repeated here. The difference between the cover shell 600 and the cover shell 400 in the above-mentioned embodiment of the pressure release device 10 is that the cover shell 600 can also be provided with a one-way valve 610, and the one-way valve 610 is used to open when the amount of liquid in the cover shell 600 reaches a threshold value to allow the liquid to flow out.

[0092] In this embodiment, the one-way valve 610 is disposed at the bottom edge of the housing 600 to cooperate with the conical bottom of the housing 600 so that the liquid in the housing 600 can flow out smoothly and is not easily accumulated in the housing 600.

[0093] See also Figure 25 to Figure 27 Another embodiment of the pressure release device 10 of the present invention includes a centrifugal impeller 700 and an anti-blocking cover 800. The centrifugal impeller 700 can rotate around a preset axis; the anti-blocking cover 800 is arranged on the centrifugal impeller 700, and the anti-blocking cover 800 includes a first bottom plate 810 and an annular side plate 820. The annular side plate 820 is connected to the first bottom plate 810 and extends laterally to the first bottom plate 810 to form a accommodating cavity for accommodating the centrifugal impeller 700. A plurality of through holes 821 are arranged on the annular side plate 820. The through holes 821 are used to block particulate matter in the gas-liquid mixture and allow the liquid separated from the gas-liquid mixture by the centrifugal impeller 700 to flow out through the through holes 821.

[0094] The embodiment of the present invention is provided with a centrifugal impeller 700 and an anti-blocking cover 800 covered on the centrifugal impeller 700, so that gas-liquid separation can be achieved during the pressure release process through the rotation of the centrifugal impeller 700, so that the pressure release device 10 can continuously exhaust gas to release pressure, effectively shortening the opening time of the pressure cooker, and having high safety. In addition, the anti-blocking cover 800 can be used to block particulate matter in the gas-liquid mixture and can also play a bubble-breaking role, so that the bubbles burst at a position far away from the air outlet of the pressure release device, thereby reducing the overflow phenomenon, and can prevent part of the liquid from reaching the air outlet, which is beneficial to gas-liquid separation.

[0095] The structure of the centrifugal impeller 700 refers to the centrifugal impeller 100 in the above-mentioned embodiment of the pressure release device 10, and will not be described in detail here.

[0096] See also Fig.28 and Fig.29 In this embodiment, the through hole 821 is a strip-shaped hole whose length direction is parallel to the axis.

[0097] In this embodiment, there are multiple strip-shaped holes, which are arranged at intervals along the circumference of the annular side plate 820 .

[0098] In this embodiment, the width of the strip-shaped holes along the circumference of the annular side plate 820 is 0.8 mm to 3 mm, for example, 0.8 mm, 2 mm or 3 mm.

[0099] In this embodiment, the first bottom plate 810 is configured in a conical shape so that the liquid on the first bottom plate 810 gathers toward the outer edge of the first bottom plate 810 .

[0100] In this embodiment, the angle between the generatrix direction of the first bottom plate 810 and the reference plane perpendicular to the axis is 3° to 45°, for example, 3°, 20° or 45°.

[0101] In this embodiment, the centrifugal impeller 700 includes a second bottom plate 710 and blades 720. The blades 720 are disposed on a main surface of one side of the second bottom plate 710 to generate centrifugal force during the rotation of the centrifugal impeller 700 to separate the gas and liquid of the gas-liquid mixture.

[0102] In this embodiment, the distance between the outer edge of the blade 720 and the inner wall of the annular side plate 820 in the radial direction of the axis is 5 mm-50 mm, such as 5 mm, 20 mm or 50 mm.

[0103] See also Fig.30 and Figure 1 , Fig. 9 , Fig.21 or Fig.25 The pressure cooker embodiment of the present invention includes a cooker body 30, a cooker cover 20 and a pressure release device 10. The cooker cover 20 is disposed on the cooker body 30, and the pressure release device 10 is disposed on a side of the cooker cover 20 close to the cooker body 30.

[0104] The specific structure of the pressure release device 10 can be found in the above-mentioned pressure release device embodiment, which will not be described in detail here.

[0105] The present invention provides a pressure release device 10 including a centrifugal impeller and an upper cover. The centrifugal impeller and the upper cover can cooperate with each other in structure so that gas-liquid separation can be achieved during the process of rotating the centrifugal impeller and the upper cover for pressure release. Thus, the pressure release device can continuously exhaust air to release pressure, effectively shortening the opening time of the pressure cooker and having higher safety.

[0106] The above description is only an implementation mode of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A pressure release device, characterized in that: include: A centrifugal impeller, the centrifugal impeller can rotate around a preset axis, the centrifugal impeller comprises a bottom plate, blades arranged on a main surface of one side of the bottom plate, and a first guide ring arranged on a side of the blade away from the bottom plate; an upper cover, which is arranged on a side of the blade away from the bottom plate, and comprises a second guide ring, which is located on the inner side of the first guide ring along the radial direction of the axis, and the projections of the second guide ring and the first guide ring on the axis overlap, so that the gas-liquid mixture flows to the blade through the first guide ring and the second guide ring, thereby achieving gas-liquid separation through the centrifugal force generated by the rotating blades; wherein the gas-liquid mixture further flows directly toward the blades along the radial direction of the axis; The pressure release device further comprises a rotating shaft, the centrifugal impeller and the upper cover are both sleeved on the rotating shaft, and the centrifugal impeller can rotate along with the rotating shaft.

2. The pressure release device according to claim 1, characterized in that: The upper cover further includes a main body plate and an air outlet arranged on the main body plate. The second guide ring is arranged on a main surface of the main body plate on one side facing the centrifugal impeller. The gas of the gas-liquid mixture after gas-liquid separation is discharged from the air outlet, and the liquid after gas-liquid separation is discharged along the circumference of the centrifugal impeller.

3. The pressure release device according to claim 2, characterized in that: The upper cover further includes a third guide ring arranged on the main surface of the main body plate, the third guide ring is located outside the first guide ring along the radial direction of the axis, and the projections of the third guide ring and the first guide ring on the axis overlap, so that the gas-liquid mixture first passes between the third guide ring and the second guide ring, and then flows between the first guide ring and the second guide ring to the blades.

4. The pressure release device according to claim 3, characterized in that: An overlapping length of projections of the third guide ring and the first guide ring on the axis is greater than an overlapping length of projections of the second guide ring and the first guide ring on the axis.

5. The pressure release device according to claim 4, characterized in that: The distance between the second guide ring and the third guide ring is 1 mm to 5 mm, and the distance between the first guide ring and the main plate is 1 mm to 5 mm.

6. The pressure release device according to claim 2, characterized in that: The number of the blades is plural and the blades are arranged at circumferential intervals around the axis in an annular region centered on the axis.

7. The pressure release device according to claim 6, characterized in that: The upper cover further includes a fourth guide ring arranged on the main surface of the main body plate, the fourth guide ring is located on the inner side of the blade along the radial direction of the axis, and the fourth guide ring and the projection part of the blade on the axis overlap, and the fourth guide ring is used to prevent the gas-liquid mixture flowing between the first guide ring and the second guide ring from being directly output from the gas outlet.

8. The pressure release device according to claim 2, characterized in that: The number of the blades is 3 to 60, and the outer edges of the blades are located outside the bottom plate. The pressure release device further includes a driving mechanism, which is used to drive the centrifugal impeller to rotate around the axis.

9. A pressure cooker, characterized in that: It comprises a pot body, a pot cover and the pressure release device according to any one of claims 1 to 8, wherein the pot cover is arranged on the pot body, and the pressure release device is arranged on the pot cover.

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