A pressure cooker and its pressure release device

Abstract

The invention discloses a pressure cooker and a pressure release device thereof. The pressure release device comprises a centrifugal impeller and a cover shell. The centrifugal impeller can rotate around a preset axis. The cover shell is arranged on the periphery of the centrifugal impeller to form an isolation chamber. The cover shell is provided with a guide portion corresponding to the centrifugal impeller. One end of the guide portion is connected to the isolation chamber, and the other end is connected to the outside of the cover shell. Under the action of the internal and external pressure difference of the cover shell, the gas-liquid mixture flows into the isolation chamber through the guide portion and acts on the centrifugal impeller, thereby driving the centrifugal impeller to rotate to achieve gas-liquid separation of the gas-liquid mixture. The invention enables the pressure release device to continuously exhaust gas to release pressure, effectively shortens the opening time of the pressure cooker, has high safety, can omit the driving mechanism, has a simple structure and is easy to implement, and can save a lot of costs.

Description

Technical Field

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

[0002] A pressure cooker utilizes the principle that the boiling point of a liquid is higher at a higher air pressure. It applies pressure to the water contained in the pressure cooker, enabling the water to reach a higher temperature without boiling, thus achieving the purpose of accelerating the cooking speed of the stewed ingredients and saving cooking time. After cooking is completed, 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, avoiding the risk of scalding caused by food overflow.

[0003] The inventors of the present application found in long-term research and development that during the process of releasing pressure by the pressure release device of the pressure cooker, due to the rapid decrease in the pressure inside the pressure cooker, the temperature of the liquid inside the pressure cooker is higher than its boiling point temperature, resulting in partial vaporization of the liquid. When the liquid has a certain viscosity, the gas formed by vaporization expands from the inside of the liquid, generating bubbles, and the liquid or solid particles on the bubbles will be ejected with the gas, affecting the safety and cleanliness of the pressure cooker. Currently, mainly by the methods of intermittent exhaust or cooling the temperature inside the pressure cooker to reduce the pressure inside the pressure cooker, it takes a long time to open the lid, and generally, the exhaust needs to be driven by a motor, with a relatively high cost. Summary of the Invention

[0004] The present invention provides a pressure cooker and a pressure release device thereof to solve the technical problems in the prior art that during the process of releasing pressure by the pressure cooker, liquids and / or solids are easily ejected by gas, causing potential safety hazards and inconvenience in cleaning, and the cost of driving exhaust by a motor is relatively high.

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

[0006] A centrifugal impeller that can rotate around a preset axis;

[0007] A housing that covers the periphery of the centrifugal impeller and is used to form an isolation chamber. A guiding portion corresponding to the centrifugal impeller is provided on the housing. One end of the guiding portion is communicated with the isolation chamber, and the other end is communicated with the outside of the housing. The gas-liquid mixture flows into the isolation chamber through the guiding portion under the action of the pressure difference inside and outside the housing and acts on the centrifugal impeller, thereby driving the centrifugal impeller to rotate to achieve gas-liquid separation of the gas-liquid mixture.

[0008] In a specific embodiment, the centrifugal impeller includes:

[0009] A bottom plate;

[0010] The first blade is disposed on one main surface of the bottom plate and is used to generate a centrifugal force during the rotation of the centrifugal impeller, so as to separate the gas and liquid of the gas-liquid mixture.

[0011] The second blade protrudes radially from the outer periphery of the bottom plate along the axis. The gas-liquid mixture acts on the second blade to cause the centrifugal impeller to rotate.

[0012] In a specific embodiment, the number of the second blades is less than the number of the first blades, and the second blades are connected to some of the first blades.

[0013] In a specific embodiment, each of the second blades is respectively connected to at least two of the first blades that are adjacent to each other in the circumferential direction along the axis.

[0014] In a specific embodiment, the pressure release device further includes an upper cover. The upper cover is disposed on the side of the first blade away from the bottom plate. The housing is connected to the upper cover so that the centrifugal impeller is accommodated in the isolation cavity. The centrifugal impeller further includes a first guide ring disposed on the side of the first blade away from the bottom plate. The upper cover includes a second guide ring. The second guide ring is located radially inside the first guide ring along the axis, so that the gas-liquid mixture flows to the first blade between the first guide ring and the second guide ring, and thus gas-liquid separation is achieved through the centrifugal force generated by the rotating first blade.

[0015] In a specific embodiment, the upper cover further includes a main body plate and an air outlet disposed on the main body plate. The second guide ring is disposed on the main surface of the main body plate facing the centrifugal impeller. The gas after gas-liquid separation of the gas-liquid mixture is discharged from the air outlet, and the liquid after gas-liquid separation is discharged along the circumferential direction of the centrifugal impeller.

[0016] In a specific embodiment, the upper cover further includes a third guide ring disposed on the main surface of the main body plate. The third guide ring is located radially outside the first guide ring along the axis, and the projections of the third guide ring and the first guide ring on the axis partially overlap, so that the gas-liquid mixture first flows 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 first blade and the second blade.

[0017] 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 body plate is 1 mm to 5 mm.

[0018] In a specific embodiment, the bottom of the housing is conically arranged so that the liquid on the bottom of the housing gathers towards the outer edge of the bottom of the housing. The housing is also provided with a one-way valve, and the one-way valve is used to open when the liquid volume in the housing reaches a threshold value so that the liquid flows out.

[0019] To solve the above technical problems, another technical solution adopted by the present invention is to provide a pressure cooker, including a pot body, a pot lid, and the above pressure release device. The pot lid is covered on the pot body, and the pressure release device is arranged on one side of the pot lid close to the pot body.

[0020] The present invention is provided with a centrifugal impeller, which can achieve gas-liquid separation during the pressure release process by the rotation of the centrifugal impeller, 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. By arranging a housing to cover the centrifugal impeller in a closed space and driving the centrifugal impeller through the guiding part and the pressure difference inside and outside the housing, the driving mechanism can be omitted, the structure is simple and easy to implement, and a large amount of cost can be saved. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings, where:

[0022] Figure 1 is a three-dimensional structural schematic diagram of the pressure release device and the pot lid in an embodiment of the pressure release device of the present invention;

[0023] Figure 2 is a sectional structural schematic diagram of the pressure release device and the pot lid in an embodiment of the pressure release device of the present invention;

[0024] Figure 3 is a sectional structural schematic diagram of an embodiment of the pressure release device of the present invention;

[0025] Figure 4 is a three-dimensional structural schematic diagram of the centrifugal impeller in an embodiment of the pressure release device of the present invention;

[0026] Figure 5 is a front view structural schematic diagram of the centrifugal impeller in an embodiment of the pressure release device of the present invention;

[0027] Figure 6 is a top view structural schematic diagram of the centrifugal impeller in an embodiment of the pressure release device of the present invention;

[0028] Figure 7It is a partial structural schematic diagram of a centrifugal impeller in an embodiment of the pressure release device of the present invention;

[0029] Figure 8 It is a three-dimensional structural schematic diagram of the upper cover in an embodiment of the pressure release device of the present invention;

[0030] Figure 9 It is a three-dimensional structural schematic diagram of the pressure release device and the pot lid in another embodiment of the pressure release device of the present invention;

[0031] Figure 10 It is a front view structural schematic diagram of the pressure release device and the pot lid in another embodiment of the pressure release device of the present invention;

[0032] Figure 11 It is a sectional structural schematic diagram of the pressure release device in another embodiment of the pressure release device of the present invention;

[0033] Figure 12 It is a sectional structural schematic diagram of the pressure release device in another embodiment of the pressure release device of the present invention;

[0034] Figure 13 It is a three-dimensional structural schematic diagram of a centrifugal impeller in another embodiment of the pressure release device of the present invention;

[0035] Figure 14 It is a front view structural schematic diagram of a centrifugal impeller in another embodiment of the pressure release device of the present invention;

[0036] Figure 15 It is a top view structural schematic diagram of a centrifugal impeller in another embodiment of the pressure release device of the present invention;

[0037] Figure 16 It is a three-dimensional structural schematic diagram of a housing in another embodiment of the pressure release device of the present invention;

[0038] Figure 17 It is a sectional structural schematic diagram of a housing in another embodiment of the pressure release device of the present invention;

[0039] Figure 18 It is a front view structural schematic diagram of the upper cover in another embodiment of the pressure release device of the present invention;

[0040] Figure 19 It is a sectional structural schematic diagram of the upper cover in another embodiment of the pressure release device of the present invention;

[0041] Figure 20 It is a three-dimensional structural schematic diagram of the upper cover in another embodiment of the pressure release device of the present invention;

[0042] Figure 21 It is a three-dimensional structural schematic diagram of the pressure release device and the pot lid in another embodiment of the pressure release device of the present invention;

[0043] Figure 22 It is a front view structural schematic diagram of the pressure release device and the pot lid in another embodiment of the pressure release device of the present invention;

[0044] Figure 23 It is a sectional view structural schematic diagram of another embodiment of the pressure release device of the present invention;

[0045] Figure 24 It is a sectional view structural schematic diagram of another embodiment of the pressure release device of the present invention;

[0046] Figure 25 It is a three - dimensional structural schematic diagram of the pressure release device and the pot lid in another embodiment of the pressure release device of the present invention;

[0047] Figure 26 It is a sectional view structural schematic diagram of another embodiment of the pressure release device of the present invention;

[0048] Figure 27 It is a front view structural schematic diagram of the anti - clogging cover in another embodiment of the pressure release device of the present invention;

[0049] Figure 28 It is a sectional view structural schematic diagram of the anti - clogging cover in another embodiment of the pressure release device of the present invention;

[0050] Figure 29 It is a top view structural schematic diagram of the anti - clogging cover in another embodiment of the pressure release device of the present invention;

[0051] Figure 30 It is a three - dimensional structural schematic diagram of the pressure cooker embodiment of the present invention. Detailed implementation manners

[0052] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0053] The terms "first" and "second" in this application are only for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. In the description of this application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. 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 further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products, or devices. The term "and / or" merely describes the association relationship of associated objects and indicates that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0054] See Figures 1 to 6 , in an embodiment of the pressure relief device 10 of the present invention, it 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 disposed on one main surface of the bottom plate 110, and a first guide ring 130 disposed on the side of the blades 120 away from the bottom plate 110; the upper cover 200 is covered on the side of the blades 120 away from the bottom plate 110. The upper cover 200 includes a second guide ring 220. The second guide ring 220 is located radially inside the first guide ring 130 along 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 space between 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.

[0055] By providing the pressure relief device 10 including the centrifugal impeller 100 and the upper cover 200, the present invention can, through the structural cooperation of the centrifugal impeller 100 and the upper cover 200, realize gas-liquid separation during the rotation of the centrifugal impeller 100 and the upper cover 200 for pressure relief, so that the pressure relief device can continuously exhaust gas to release pressure, effectively shortening the opening time of the pressure cooker and having relatively high safety.

[0056] In this embodiment, the pressure relief device 10 may further include a rotating shaft 140. Both the centrifugal impeller 100 and the upper cover 200 are sleeved on the rotating shaft 140, 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 herein.

[0057] In this embodiment, the main surface of the bottom plate 110 is a plane, the blades 120 are further arranged perpendicular to the main surface, the number of the blades 120 is multiple, and they are circumferentially spaced around the axis within an annular region centered on the axis.

[0058] In this embodiment, the blades 120 are arranged in an arc shape along the radial direction of the axis. Referring also to Figure 7 , the droplets 30 in the gas-liquid mixture are not only subjected to the tangential force of the blades 120, but also subjected to the radial force of the blades 120, specifically as follows:

[0059] Mass of the droplet 30:

[0060]

[0061] where 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.

[0062] Centrifugal force received by the droplet 30:

[0063]

[0064] where ω is the angular velocity of the rotation of the centrifugal impeller 100.

[0065] Force acting area of the droplet 30:

[0066]

[0067] Then, the centrifugal force received by the droplet 30 per unit area, that is, the pressure difference acting on the droplet 30 by the blades 120 along the radial direction of the axis is:

[0068]

[0069] Therefore, the droplet 30 can overcome the pressure difference along the radial direction of the axis and be thrown out of the centrifugal impeller 100, thereby better realizing gas-liquid separation.

[0070] In this embodiment, the radian β of the blades 120 is 15° to 65°, such as 15°, 30° or 65°.

[0071] In this embodiment, the ratio of the length of the blades 120 along the radial direction of the axis to the maximum distance between two adjacent blades 120 is greater than 0.2, such as 0.4, 0.5 or 1, etc.

[0072] In this embodiment, the gas-liquid mixture can further flow directly along the radial direction of the axis to the blades 120, and gas-liquid separation is achieved by the centrifugal force generated by the rotating blades 120.

[0073] See also Figure 8 In this embodiment, the upper cover 200 further includes a main body plate 210 and an air outlet 211 provided on the main body plate 210. The second guide ring 220 is disposed on one main surface of the main body plate 210 facing the centrifugal impeller 100. The gas after gas-liquid separation of the gas-liquid mixture enters the space surrounded by the blades 120 from between the first guide ring 130 and the second guide ring 220 and between the plurality of 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 circumferential direction of the centrifugal impeller 100, thereby realizing gas-liquid separation.

[0074] In this embodiment, the upper cover 200 further includes a third guide ring 230 provided on the main surface of the main body plate 210. The third guide ring 230 is located radially outside the first guide ring 130 along the axis, and a part of the projections of the third guide ring 230 and the first guide ring 130 on the axis overlap, so that the gas-liquid mixture first passes between the third guide ring 230 and the second guide ring 220, and then flows to the blades 120 between the first guide ring 130 and the second guide ring 220.

[0075] 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.

[0076] 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 body plate 210 may be 1 mm to 5 mm, such as 1 mm, 2 mm or 5 mm.

[0077] In this embodiment, the upper cover 200 further includes a fourth guide ring 240 provided on the main surface of the main body plate 210. The fourth guide ring 240 is located radially inside the blades 120 along the axis, and a part of the projections of the fourth guide ring 240 and the blades 120 on the axis overlap. The fourth guide ring 240 is used to prevent the gas-liquid mixture flowing between the first guide ring 130 and the second guide ring 220 from being directly output from the air outlet 211.

[0078] In this embodiment, the number of the blades 120 may be 3 to 60, such as 3, 10 or 60, and the outer edge of the blades 120 is located outside the bottom plate 110. The pressure release device 10 further includes a driving mechanism (not shown in the figure), and the driving mechanism is used to drive the centrifugal impeller 100 to rotate around the axis.

[0079] In this embodiment, the ratio of the length of the blade 120 in the radial direction along the axis to the distance between the inner ring of the annular region and the axis in the radial direction along the axis is 0.1 to 0.5, such as 0.1, 0.2, or 0.5.

[0080] In this embodiment, the distance between the inner ring of the annular region and the axis in the radial direction along 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 large centrifugal force at a certain rotational speed.

[0081] In this embodiment, the pressure release device 10 may further include a sealing ring 150, and the sealing ring 150 is disposed at the connection between the centrifugal impeller 100 and the upper cover 200.

[0082] Refer back to Figure 3 , specifically, when the pressure cooker needs to release 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 flows directly in the radial direction along the axis to the blade 120, 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 the 120 through the two paths is separated into gas and liquid. The gas continues to flow into the interior of the centrifugal impeller 100 and is discharged through the air outlet 211; the liquid is directly discharged back into the pressure cooker along the circumferential direction of the centrifugal impeller 100.

[0083] Refer to Figures 9 to 12 , another embodiment of the pressure release device 10 of the present invention includes a centrifugal impeller 300 and a housing 400. The centrifugal impeller 300 can rotate around a preset axis; the housing 400 covers the periphery of the centrifugal impeller 300 to form an isolation chamber 410. A guide portion 420 corresponding to the centrifugal impeller 300 is provided on the housing 400. One end of the guide portion 420 communicates with the isolation chamber 410, and the other end communicates with the outside of the housing 400. The gas-liquid mixture flows into the isolation chamber 410 through the guide portion 420 under the action of the pressure difference inside and outside the housing 400 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.

[0084] In the embodiment of the present invention, the centrifugal impeller 300 is provided, and gas-liquid separation can be achieved during the pressure release process by 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 the housing 400 to cover the centrifugal impeller 300 in a closed space and driving the centrifugal impeller 300 through the guide portion 420 and the pressure difference inside and outside the housing 400, the driving mechanism can be omitted, the structure is simple and easy to implement, and a large amount of cost can be saved.

[0085] See also Figures 13 to 15 In this embodiment, the centrifugal impeller 300 includes a bottom plate 310, a first blade 320, and a second blade 330. The first blade 320 is disposed on one main surface of the bottom plate 310 and is configured to generate a 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 radially from the outer periphery of the bottom plate 310 along the axis, and the gas-liquid mixture acts on the second blade 330 to cause the centrifugal impeller 300 to rotate.

[0086] In this embodiment, the guiding portion 420 can be a tubular nozzle. The outlet of the nozzle faces the groove of the second blade 330, and the extending direction of the nozzle is tangent to the outer periphery of the bottom plate 310.

[0087] In other embodiments, the guiding portion 420 can also be one or more through holes (not shown in the figure) having a smaller cross-sectional area and disposed on the housing 400. The through holes face the grooves of the second blade 330, and the gas-liquid mixture can flow quickly to the second blade 330 through the through holes. Alternatively, the guiding portion 420 can also be a column or a cantilever disposed in the housing 400. The interior of the column or the cantilever is a cavity, and one or more through holes are provided on the surface. The through holes face the grooves of the second blade 330, and the gas-liquid mixture can flow quickly to the second blade 330 through the through holes.

[0088] 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, etc.

[0089] In this embodiment, each second blade 330 is respectively connected to at least two first blades 320 that are circumferentially adjacent to each other along the axis.

[0090] See also Figures 16 to 20 In this embodiment, the centrifugal impeller 300 can further include a first guiding ring 340 disposed 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 covered on the side of the first blade 320 away from the bottom plate 310. The housing 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 body plate 510 and a second guiding ring 520 disposed on the main surface of the main body plate 510. The second guiding ring 520 is radially located inside the first guiding ring 340 along the axis so that the gas-liquid mixture flows to the first blade 320 between the first guiding ring 340 and the second guiding ring 520, thereby realizing gas-liquid separation through the centrifugal force generated by the rotating first blade 320.

[0091] Among them, for the structures of the first diversion ring 340 and the upper cover 500, refer to the first diversion ring 130 and the upper cover 200 in the above-mentioned pressure relief device 10, which will not be elaborated here.

[0092] In this embodiment, an external thread 530 is provided on the outer periphery of the main body plate 510 of the upper cover 500, and an internal thread 440 is provided on the inner periphery of the top of the housing 400. The external thread 530 cooperates with the internal thread 440 to realize the connection between the upper cover 500 and the housing 400.

[0093] In this embodiment, the bottom 430 of the housing 400 is tapered so that the liquid on the bottom 430 of the housing 400 gathers towards the outer edge of the bottom 430 of the housing 400.

[0094] Refer to Figures 21 to 24 , another embodiment of the pressure relief device 10 of the present invention includes a centrifugal impeller 300, an upper cover 500 and a housing 600. Among them, for 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 relief device 10, which will not be elaborated here. The difference between the housing 600 and the housing 400 in the above-mentioned embodiment of the pressure relief device 10 is that the housing 600 may further be provided with a check valve 610, and the check valve 610 is used to open when the liquid volume in the housing 600 reaches a threshold value so that the liquid flows out.

[0095] In this embodiment, the check valve 610 is arranged at the bottom edge of the housing 600 to cooperate with the tapered bottom of the housing 600, so that the liquid in the housing 600 can flow out smoothly and is not likely to accumulate in the housing 600.

[0096] Refer to Figures 25 to 27 , another embodiment of the pressure relief 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 covers the centrifugal impeller 700. 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 towards the first bottom plate 810 to form an accommodation cavity for accommodating the centrifugal impeller 700. A plurality of through holes 821 are provided on the annular side plate 820. The through holes 821 are used to block the 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.

[0097] In an embodiment of the present invention, by providing a centrifugal impeller 700 and an anti-blocking cover 800 covering the centrifugal impeller 700, gas-liquid separation can be achieved during the pressure release process by the rotation of the centrifugal impeller 700, so that the pressure release device 10 can continuously exhaust gas to release pressure, effectively shortening the time for opening the lid of the pressure cooker, and having relatively high safety. Moreover, the anti-blocking cover 800 can block particulate matter in the gas-liquid mixture, and at the same time can play a role in defoaming, causing the bubbles to burst at a position farther away from the air outlet hole of the pressure release device, reducing the phenomenon of liquid overflow, and enabling some liquid to not reach the air outlet hole, which is beneficial to gas-liquid separation.

[0098] Among them, for the structure of the centrifugal impeller 700, refer to the centrifugal impeller 100 in the embodiment of the pressure release device 10 above, and details will not be elaborated here.

[0099] Refer to together Figure 28 and Figure 29 , in this embodiment, the through hole 821 is a strip-shaped hole with its length direction parallel to the axis.

[0100] In this embodiment, the number of strip-shaped holes is multiple, and they are arranged at intervals along the circumferential direction of the annular side plate 820.

[0101] In this embodiment, the width of the strip-shaped hole along the circumferential direction of the annular side plate 820 is 0.8 mm to 3 mm, such as 0.8 mm, 2 mm or 3 mm.

[0102] In this embodiment, the first bottom plate 810 is arranged in a conical shape so that the liquid on the first bottom plate 810 gathers towards the outer edge of the first bottom plate 810.

[0103] 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°, such as 3°, 20° or 45°.

[0104] In this embodiment, the centrifugal impeller 700 includes a second bottom plate 710 and blades 720. The blades 720 are arranged on one main surface of the second bottom plate 710 and are used to generate centrifugal force during the rotation of the centrifugal impeller 700 to separate the gas and liquid in the gas-liquid mixture.

[0105] 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, etc.

[0106] Refer to Figure 30 and Figure 1 , Figure 9 , Figure 21 or Figure 25, an embodiment of the pressure cooker of the present invention includes a pot body 30, a pot lid 20, and a pressure release device 10. The pot lid 20 is covered on the pot body 30, and the pressure release device 10 is arranged on one side of the pot lid 20 close to the pot body 30.

[0107] Among them, for the specific structure of the pressure release device 10, refer to the above-mentioned embodiment of the pressure release device, which will not be elaborated here.

[0108] By setting the pressure release device 10 including a centrifugal impeller and an upper cover, the present invention can achieve gas-liquid separation during the rotation of the centrifugal impeller and the upper cover for pressure release through the structural cooperation between the centrifugal impeller and the upper cover, so that the pressure release device can continuously exhaust gas to release pressure, effectively shortening the opening time of the pressure cooker and having relatively high safety.

[0109] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. A pressure relief device, characterized in that, it includes: a centrifugal impeller that can rotate around a preset axis; a housing covering the periphery of the centrifugal impeller for forming an isolation chamber. A guiding portion corresponding to the centrifugal impeller is provided on the housing. One end of the guiding portion communicates with the isolation chamber, and the other end communicates with the outside of the housing. The gas-liquid mixture flows into the isolation chamber through the guiding portion under the action of the pressure difference inside and outside the housing and acts on the centrifugal impeller, thereby driving the centrifugal impeller to rotate to achieve gas-liquid separation of the gas-liquid mixture; wherein, the centrifugal impeller includes: a bottom plate; a first blade provided on one main surface of the bottom plate for generating centrifugal force during the rotation of the centrifugal impeller to separate the gas and liquid of the gas-liquid mixture; a second blade protruding radially from the outer periphery of the bottom plate along the axis. The gas-liquid mixture acts on the second blade to make the centrifugal impeller rotate; wherein, the outlet of the guiding portion faces the groove of the second blade.

2. The pressure relief device according to claim 1, characterized in that, the number of the second blades is less than the number of the first blades, and the second blades are connected to some of the first blades.

3. The pressure relief device according to claim 2, characterized in that, each of the second blades is respectively connected to at least two of the first blades adjacent to each other in the circumferential direction along the axis.

4. The pressure relief device according to claim 1, characterized in that, the pressure relief device further includes an upper cover covering the side of the first blade away from the bottom plate. The housing is connected to the upper cover so that the centrifugal impeller is accommodated in the isolation chamber. The centrifugal impeller further includes a first guiding ring provided on the side of the first blade away from the bottom plate. The upper cover includes a second guiding ring. The second guiding ring is located radially inside the first guiding ring along the axis so that the gas-liquid mixture flows to the first blade between the first guiding ring and the second guiding ring, thereby achieving gas-liquid separation through the centrifugal force generated by the rotating first blade.

5. The pressure relief device according to claim 4, characterized in that, the upper cover further includes a main body plate and an air outlet provided on the main body plate. The second guiding ring is provided on the main surface of the main body plate facing the centrifugal impeller. The gas after gas-liquid separation of the gas-liquid mixture is discharged from the air outlet, and the liquid after gas-liquid separation is discharged along the circumferential direction of the centrifugal impeller.

6. The pressure relief device according to claim 5, characterized in that, The upper cover further includes a third flow guiding ring disposed on the main surface of the main body plate. The third flow guiding ring is located outside the first flow guiding ring along the radial direction of the axis, and the projections of the third flow guiding ring and the first flow guiding ring on the axis partially overlap, so that the gas-liquid mixture first flows between the third flow guiding ring and the second flow guiding ring, and then flows between the first flow guiding ring and the second flow guiding ring to the first blade and the second blade.

7. The pressure relief device according to claim 6, wherein, the distance between the second flow guiding ring and the third flow guiding ring is 1 mm to 5 mm, and the distance between the first flow guiding ring and the main body plate is 1 mm to 5 mm.

8. The pressure relief device according to claim 1, wherein, the bottom of the housing is tapered so that the liquid on the bottom of the housing gathers towards the outer edge of the bottom of the housing. The housing is further provided with a one-way valve, and the one-way valve is configured to open when the liquid volume in the housing reaches a threshold value so that the liquid flows out.

9. A pressure cooker, wherein, comprising a pot body, a pot lid, and the pressure relief device according to any one of claims 1 to 8. The pot lid is covered on the pot body, and the pressure relief device is disposed on one side of the pot lid close to the pot body.

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