Pressure relief cooling structure and electric pressure cooker with same

Abstract

The invention provides a pressure relief cooling structure and an electric pressure cooker with the same, relates to the technical field of kitchen appliances, and solves the technical problem that the electric pressure cooker needs to be naturally cooled for a long time due to high temperature and high pressure after cooking is finished. The pressure relief cooling structure comprises an inner pot, a supporting ring, a wire spool, a water storage box, a water pump and a guide pipe. After cooking is finished, the water pump conveys water in the cold water cavity of the water storage box to the water inlet of the supporting ring through the guide pipe and sprays the water on the outer wall of the inner pot to achieve rapid cooling. Cooling water flows back to the hot water cavity of the water storage box through the water outlet of the wire spool and then enters the cold water cavity for recycling through the exchange hole. The water storage box is provided with a water storage box water inlet and a water storage box water outlet, the layout is reasonable, and water supplementing and water discharging are convenient. The invention further provides the electric pressure cooker integrated with the structure, the cooling and pressure relief process can be automatically controlled through the temperature sensor and the pressure sensor, the waiting time after cooking is remarkably shortened, and the user experience and the use safety are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of kitchen appliances, in particular to a quick pressure relief cooling structure of an electric pressure cooker and an electric pressure cooker with the same, for shortening the cooling waiting time after cooking and improving user experience. BACKGROUND

[0002] In daily use, compared with ordinary cooking utensils, the electric pressure cooker can increase the pressure in the pot during cooking, thereby increasing the boiling point of water in the pot and making the food in the pot more easily cooked. After cooking, the existing electric pressure cooker needs to be naturally cooled for a period of time due to the high temperature and high pressure in the pot. Only when the temperature in the pot decreases and the pressure decreases to normal pressure, the pot cover can be opened. The waiting time for this cooling process is long, which brings great inconvenience to the daily use of users.

[0003] In order to solve the above problems, the patent CN207627039U proposes a quick cooling scheme, but uses an indirect cooling method, which has limited effect. SUMMARY

[0004] The purpose of the present application is to provide a quick pressure relief cooling structure of an electric pressure cooker and an electric pressure cooker with the same, to realize quick cooling and pressure relief, and to significantly shorten the waiting time, so as to solve the technical problem that the electric pressure cooker needs to be naturally cooled for a long time after cooking due to high temperature and high pressure in the prior art.

[0005] To achieve the above purpose, the present application provides the following technical solutions: The pressure relief cooling structure of the electric pressure cooker provided by the present application comprises: an inner pot, a support ring water inlet, a wire reel, a water storage box, a water pump and a conduit; The inner pot is a cylindrical structure for containing food; The support ring water inlet is arranged on the outer side of the inner pot, the water storage box is located below the inner pot, one end of the conduit is in communication with the water storage box, and the other end is in communication with the support ring water inlet, the water pump is arranged on the conduit, and the wire reel is provided with a wire reel water outlet for returning the cooled water to the water storage box water inlet.

[0006] The water pump is used to deliver the water in the water storage box to the support ring water inlet.

[0007] The pressure relief cooling structure of the electric pressure cooker of the present application directly sprays and cools the outer wall of the inner pot, which significantly improves the cooling speed.

[0008] On the basis of the above technical solutions, the present application can also be improved as follows.

[0009] As a further improvement of the present application, the support ring water inlet is provided in multiple, and is arranged in a circumferential interval along the inner pot, so as to improve the cooling speed of the cooling water to the outer wall of the inner pot.

[0010] The multi-water inlet design improves the cooling uniformity and avoids local overheating to cause uneven pressure drop.

[0011] As a further improvement of the present application, a partition plate is arranged in the water storage box to divide the inner cavity into a cold water cavity and a hot water cavity, and the cold water cavity and the hot water cavity are communicated through an exchange hole; the bottom of the cold water cavity is provided with a water outlet of the water storage box, which is located at the lowest position of the water storage surface, so as to facilitate complete emptying or supplement of the cooling water.

[0012] The cold and hot partitioning of the water storage box and the exchange hole realize the recycling of the cooling water, save water, and have compact structure and are easy to integrate into the existing electric pressure cooker. The bottom water outlet ensures full utilization of the cooling water and reduces residue.

[0013] As a further improvement of the present application, the number of the exchange holes is at least one, and all the exchange holes are the same or different in size, which are used to control the water flow rate from the hot water cavity to the cold water cavity, so as to adjust the cooling efficiency.

[0014] The number and size of the exchange holes in the present application are adjustable, and the adjustable exchange holes optimize the heat exchange balance and adapt to different cooking power and environmental temperature.

[0015] As a further improvement of the present application, the exchange hole is located at the bottom of the partition plate.

[0016] As a further improvement of the present application, the conduit includes a first conduit and a second conduit, the first conduit connects the water pump and the support ring water inlet, and the second conduit connects the water pump and the water outlet of the water storage box.

[0017] The present application provides an electric pressure cooker, which comprises the pressure relief and cooling structure, and a pot cover, a heating device and a control circuit, and the control circuit is configured to start the water pump to perform the cooling and pressure relief operation after cooking is completed.

[0018] The cooling structure is integrated into the electric pressure cooker to form a complete product, and the user's pain points are solved.

[0019] As a further improvement of the present application, the heating device and the pressure relief and cooling structure are linked and controlled, and the heating is stopped and the water pump is started to perform forced water cooling in the cooling stage.

[0020] The heating and cooling are linked, which avoids energy waste and improves efficiency.

[0021] As a further improvement of the present application, the pot cover is provided with a safety lock mechanism, and can be unlocked and opened only when the pressure drops to normal pressure.

[0022] The safety lock ensures that the cover can only be opened when the pressure is normal, thus guaranteeing safety.

[0023] As a further improvement of the present invention, the water pump is an adjustable speed micro centrifugal pump, which can dynamically adjust the cooling water flow rate according to the inner pot temperature.

[0024] Adjustable speed water pumps are suitable for different working conditions, saving energy and extending service life.

[0025] As a further improvement of the present invention, the control circuit includes a temperature sensor and a pressure sensor for detecting the temperature and pressure of the inner pot, and automatically starting a cooling and pressure relief program when a preset threshold is reached.

[0026] Sensor-linked control enables fully automatic cooling and pressure relief without manual intervention. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. 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 effort.

[0028] Figure 1 This is a schematic diagram of one embodiment of the cooling and pressure relief structure of the present invention; Figure 2 This is a schematic diagram of another embodiment of the cooling and pressure relief structure of the present invention; Figure 3 This is a schematic diagram of the third embodiment of the cooling and pressure relief structure of the present invention; Figure 4 This is a perspective cross-sectional view of one embodiment of the water storage box in the cooling and depressurization structure of the present invention; Figure 5 This is a perspective cross-sectional view of another embodiment of the water storage box in the cooling and pressure relief structure of the present invention.

[0029] In the picture: 1. Inner pot; 2. Support ring inlet; 3. Winding reel; 31. Water outlet of the winding reel; 4. Water storage box; 41. Cold water chamber; 42. Hot water chamber; 43. Exchange port; 44. Partition; 45. Water inlet of the water storage box; 46. ​​Water outlet of the water storage box; 5. Water pump; 6, conduit; 61, first conduit; 62, second conduit. DETAILED DESCRIPTION

[0030] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described in detail below. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present application.

[0031] Embodiment 1 As shown in Figure 1 and Figure 5 The present application provides a pressure relief and cooling structure which can quickly cool and release pressure in the pot after cooking is completed. The pressure relief and cooling structure mainly comprises an inner pot, a support ring water inlet, a winding disc, a water storage box, a water pump and a conduit. After cooking is completed, the temperature in the pot is high and the pressure is large. At this time, the water pump delivers the water in the water storage box to the support ring water inlet through the conduit, and sprays the outer wall of the high-temperature inner pot, so that the temperature in the pot is reduced, and the pressure is reduced to the same atmospheric pressure. At this time, the pot can be quickly opened, and the problem of long waiting time is avoided. At the same time, the cooling water is returned to the inner cavity of the water storage box through the winding disc water outlet, and is recycled.

[0032] Specifically, the inner pot 1 is located at the top of the electric pressure cooker and is in a cylindrical shape, and is used for containing food materials. The support ring water inlet 2 is arranged on the outer side of the inner pot, and the support ring water inlet 2 is connected with the water pump 5 through the first conduit 61. The water inlet end of the water pump 5 is connected with the water storage box water outlet 46 through the second conduit 62, and the water outlet end of the water pump 5 is connected with the support ring water inlet 2 through the first conduit 61.

[0033] The water storage box 4 is in a rectangular box structure and is located at the bottom of the electric pressure cooker. The water storage box 4 is provided with a water storage box water inlet 45 and a water storage box water outlet 46, which are respectively used for receiving the returned cooling water and supplying water to the water pump 5. The winding disc 3 is arranged on the lower part of the outer side of the inner pot 1, and the winding disc water outlet 31 of the winding disc 3 guides the cooled water to the water storage box water inlet 45.

[0034] After cooking is completed, the control circuit starts the water pump 5, and the cold water in the water storage box 4 is sprayed out through the second conduit 62→the first conduit 61→the support ring water inlet 2, and directly sprays the outer wall of the inner pot. The surface of the high-temperature inner pot is rapidly cooled, the steam in the pot is condensed, and the pressure is reduced. After the cooling water flows down, it is collected by the winding disc 3, flows into the water storage box water inlet 45 from the winding disc water outlet 31, and enters the water storage box 4 to form a closed circulation. This process can continue until the pressure sensor detects that the pressure is normal, and the pot cover safety lock is released.

[0035] This structure realizes direct cooling + circulating water, avoids long waiting of traditional natural cooling, and reduces water consumption.

[0036] When the electric pressure cooker finishes cooking and the cooling and pressure relief function is started, the water pump sucks the water in the water storage box into the first conduit through the second conduit, and then sprays the cooling water to the outer wall of the high-temperature inner pot through the support ring water inlet, so that the temperature in the pot decreases and the pressure decreases, achieving the purpose of cooling and pressure relief.

[0037] After the cooling water cools the outer wall of the inner pot, the water flows back into the water storage box through the water outlet of the winding disc along the water inlet of the water storage box, which can achieve the effect of circulating cooling.

[0038] Embodiment 2: Further, if multiple support ring water inlets 2 are designed around the inner pot, the cooling speed can be further improved.

[0039] As shown in Figure 2 , the difference between this embodiment and embodiment 1 is only that the number of support ring water inlets 2 is multiple, and they are uniformly spaced along the circumferential direction of the inner pot 1. Of course, non-uniform setting structure can also be used, as long as multiple support ring water inlets 2 are set for cooling different positions of the inner pot 1. For example, there are 4 support ring water inlets 2, and each support ring water inlet 2 is supplied with water by an independent conduit branch. In this way, the cooling water can cover the entire circumference of the inner pot, avoiding the situation of uneven temperature and unbalanced pressure drop caused by one-sided cooling, and is particularly suitable for large-capacity electric pressure cookers or situations with multiple layers of steaming racks.

[0040] It should be noted that, for the convenience of observation, only the support ring water inlet 2 on the other side is shown in Figure 2 , but the conduit connected thereto is not shown. The conduit connected thereto can be directly connected with the outlet end of the water pump on the right side, or another set of water pump can be independently set and connected thereto, which is not limited here.

[0041] Embodiment 3: As shown in Figure 3 and Figure 4 , the difference between this embodiment and embodiment 1 or embodiment 2 is only that a partition plate 44 is vertically arranged in the water storage box, the partition plate 44 is provided with exchange holes 43, the inner cavity of the water storage box 4 is divided into a hot water cavity 42 and a cold water cavity 41 by the partition plate 44, the hot water cavity 42 and the cold water cavity 41 are communicated through the exchange holes 43, the water outlet 46 of the water storage box is arranged on one side of the cold water cavity 41 and located at the lowest position of the water storage surface, facilitating complete emptying or replenishing of cooling water; and the water inlet 45 of the water storage box is arranged on one side of the hot water cavity 42.

[0042] In this embodiment, in order to further improve the applicability, the number of exchange holes 43 is at least one, all the exchange holes 43 are the same size or different, for controlling the water flow rate of the hot water cavity 42 to the cold water cavity 41, so as to adjust the cooling efficiency. The exchange hole 43 is located at the bottom of the partition plate 44.

[0043] Further, the exchange hole 43 on the partition plate 44 of the water storage box 4 is designed as a replaceable aperture or a structure equipped with an adjusting valve piece, which can increase the aperture after high-temperature environment or heavy cooking, accelerate the flow of the hot water cavity 42 to the cold water cavity 41, and improve the circulation speed; when the ambient temperature is lower, the aperture is reduced, the cold water heat preservation time is prolonged, and the water pump energy consumption and noise are reduced.

[0044] It should be noted here that the replaceable aperture structure of the exchange hole 43 can be designed as a detachable cover plate structure at the position of the exchange hole 43. The cover plate has a hole with different diameters (such as Φ3mm, Φ5mm, Φ8mm) reserved in the center, and the user or the maintenance personnel can replace the cover plate with a corresponding aperture according to the use environment.

[0045] Installation method: the cover plate is fixed on the outside of the partition plate by screw fastening or buckle, which is convenient to disassemble.

[0046] The structure equipped with an adjusting valve piece of the exchange hole 43 is that a rotatable fan-shaped or butterfly-shaped adjusting valve piece (material is food-grade PP or stainless steel) is added at the exchange hole 43, and the valve piece rotating shaft is perpendicular to the water flow direction. The valve piece rotating angle is adjustable from 0° to 90°, 0° is completely closed to the exchange hole, and 90° is fully opened.

[0047] Driving method: Manual adjustment: a knob or lever is arranged outside the water storage box, and the user can adjust as needed (suitable for household models).

[0048] Electric adjustment: a small step motor is integrated, and the valve piece angle is automatically adjusted by a microprocessor according to the feedback of a temperature sensor (suitable for high-end intelligent models).

[0049] Control logic: Initial cooling stage (temperature in the pot > 90℃, high pressure): instruct the motor to adjust the valve piece to a large angle (close to full opening), and accelerate the cold water supplement.

[0050] Middle and late cooling stage (temperature drops to about 70℃): gradually reduce the valve piece opening, keep the cold water cavity water temperature stable, and prolong the effective cooling time.

[0051] Advantages: compared with replacing the aperture, the adjusting valve piece can realize continuous adjustment, has fast response speed, and is more suitable for automatic control.

[0052] After cooking, the water pump transports the water in the cold water cavity of the water storage box to the water inlet of the support ring through the conduit, and sprays it to the outer wall of the inner pot for cooling; the cooling water flows out of the water outlet of the winding disc, returns to the hot water cavity of the water storage box, and then enters the cold water cavity through the exchange hole for recycling.

[0053] Embodiment 4: The difference between this embodiment and the previous three embodiments is that a valve can be added to the conduit 6, for example, an electromagnetic valve is installed near the water pump inlet of the second conduit 62, which is powered on to open at the end of cooking, and is powered off to close when cooling is completed or an abnormality such as low water level occurs, preventing idling or reverse flow. A one-way check valve can be added inside the water storage box to ensure that hot water only flows one-way to the cold water cavity, preventing cold water from flowing back. This design improves system reliability and avoids water leakage or cooling failure caused by misoperation.

[0054] Embodiment 5: This embodiment provides an electric pressure cooker, which includes a pressure relief and cooling structure, a pot cover, a heating device, and a control circuit; the control circuit is configured to start the water pump for cooling and pressure relief operation after cooking is completed.

[0055] After cooking, the temperature and pressure in the pot are high, and at this time the water pump sprays the water in the water storage tank to the outer wall of the high-temperature inner pot, causing the temperature in the pot to drop, and the pressure to drop to the same atmospheric pressure, so that the pot can be quickly opened, avoiding the problem of long waiting time.

[0056] The control circuit includes a temperature sensor and a pressure sensor for detecting the temperature and pressure of the inner pot, and automatically starting the cooling and pressure relief program when the preset threshold is reached.

[0057] The heating device is linked with the pressure relief and cooling structure for linkage control, and the heating is stopped and the water pump is started for forced water cooling in the cooling stage.

[0058] The pot cover is provided with a safety lock mechanism, which can only be unlocked and opened when the pressure drops to normal pressure. Specifically, the pot cover is provided with an electromagnetically driven safety lock, which is driven by the solenoid of the pressure sensor. Only when the pressure sensor detects that the pressure is ≤ normal pressure and the temperature is ≤ safety threshold such as 50℃, the lock is released. At the same time, the display screen or indicator light prompts the "cover open" state, preventing misoperation from causing danger.

[0059] The control circuit integrates the temperature sensor and the pressure sensor, which can be installed on the top or side wall of the inner pot and the microprocessor, for real-time monitoring of the temperature and pressure.

[0060] The water pump is a variable-speed micro centrifugal pump, which can dynamically adjust the cooling water flow according to the temperature of the inner pot.

[0061] Specifically, the water pump 5 adopts a direct-current brushless adjustable-speed micro centrifugal pump, and the rotation speed is controlled by a PWM signal. Users can select "rapid cooling" high-speed gear, "standard cooling" medium-speed gear or "energy-saving cooling" low-speed gear on the operation panel to meet different scene requirements. The high-speed gear is suitable for situations requiring immediate opening of the cover, is used for initial rapid cooling, and the medium and low-speed gears are used for maintaining circulation. The energy-saving gear is suitable for situations not requiring immediate opening of the cover.

[0062] When the pressure is higher than the normal pressure and the temperature is higher than a set value, such as 90℃, the water pump is started in the medium-speed gear; when the temperature drops to about 70℃, the low-speed gear is switched, until the pressure sensor detects the normal pressure, and the safety lock of the pot cover is unlocked. This strategy takes into account the cooling speed and energy consumption.

[0063] The electric pressure cooker of the present application adopts a direct spraying cooling mode for the pressure relief and cooling structure, greatly improves the heat conduction efficiency, and shortens the cooling time by 3-5 times compared with the traditional air cooling. After the cooling water completes the cooling of the inner pot, it is collected at the winding disc and flows back to the water storage box to realize closed water circulation, water saving and environmental protection, and only a small amount of water needs to be supplemented for a single operation. The present application is modularized, and the water storage box, water pump and conduit can be independently manufactured and assembled, which is convenient for upgrading the existing electric pressure cooker. The sensor + control circuit realizes automatic cooling and pressure relief without manual monitoring, and realizes intelligent linkage; safe and reliable: safety lock + multiple waterway protection, which eliminates the risk of opening the cover under high temperature and high pressure. Expandability: can be combined with a waste heat recovery system to use the water in the hot water cavity to preheat the water for the next cooking, improving energy efficiency.

[0064] Under laboratory conditions, a 5L capacity electric pressure cooker was tested for comparison: Traditional natural cooling: it takes about 18 minutes to drop from 120℃, 80kPa to normal temperature and pressure.

[0065] Spraying and circulating cooling of the present application: it only takes about 4 minutes to drop to normal temperature and pressure, and the cooling efficiency is improved by about 350%.

[0066] The water consumption is about 150ml per time, which is much lower than the several liters of water consumption of the traditional water cooling method.

[0067] This structure can directly replace the cooling module of the existing electric pressure cooker without changing the main body of the machine, and can be upgraded. Since closed water circulation is adopted, the water consumption is very low, about 100-300ml per cycle, which is suitable for long-term use at home. The spraying cooling efficiency is improved by 3-5 times compared with air natural cooling, and the cooling time can be shortened from 15-20 minutes to 3-5 minutes in actual measurement, greatly improving the experience.

[0068] In addition, the circulating water system can be combined with a waste heat recovery system: the water in the hot water cavity can be used to preheat the water for the next cooking, further improving energy efficiency. In terms of safety, all waterway components are made of food-grade materials, which are resistant to high temperature and corrosion, and ensure hygiene.

[0069] Example 6: The embodiment differs from embodiment 5 only in that, as shown in Figure 4 The bottom of the water storage box is provided with a detachable drain for periodic discharge of deposited impurities; a fine mesh filter is installed at the exchange hole 43 between the hot water cavity 42 and the cold water cavity 41 to block food residue or scale from entering the cold water cavity, thereby extending the service life of the system and reducing the frequency of maintenance.

[0070] First of all, it should be noted that "inward" is the direction towards the center of the accommodation space, and "outward" is the direction away from the center of the accommodation space.

[0071] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. Figure 1

[0072] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0073] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0074] ​In the present disclosure, unless specifically stated and limited otherwise, a first feature "on" or "under" a second feature can be directly in contact with the second feature, or indirectly in contact with the second feature through an intermediate medium. Also, a first feature "over", "above" and "on top of" a second feature can be directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. A first feature "under", "below" and "underneath" a second feature can be directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0075] In the description of the present disclosure, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In the present disclosure, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, different embodiments or examples described in the present disclosure and the features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0076] The above description is merely specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present disclosure, which should be covered by the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A pressure relief cooling structure of an electric pressure cooker, characterized by, It comprises: Inner pot (1), support ring water inlet (2), winding disc (3), water storage box (4), water pump (5), conduit (6), the support ring water inlet (2) is arranged on the outer side of the inner pot (1); the water storage box (4) is located below the inner pot (1), one end of the conduit (6) is communicated with the water storage box (4), and the other end is communicated with the support ring water inlet (2); the water pump (5) is arranged on the conduit (6); the winding disc (3) is provided with a winding disc water outlet (31), which is used for returning the cooled water to the water storage box water inlet (45); The water pump (5) is used for conveying the water in the water storage box (4) to the support ring water inlet (21).

2. The pressure relief cooling structure of claim 1, wherein The support ring water inlet (2) is arranged as multiple, which is arranged along the circumference of the inner pot (1) and is spaced to improve the cooling speed of the cooling water on the outer wall of the inner pot.

3. The pressure relief cooling structure of claim 1, wherein The water storage box (4) is provided with a partition plate, so as to divide the inner cavity into a cold water cavity (41) and a hot water cavity (42), and is communicated through an exchange hole (43); the bottom of the cold water cavity is provided with a water storage box water outlet (46), which is located at the lowest position of the water storage surface, so as to facilitate complete emptying or supplement of cooling water.

4. The pressure relief cooling structure of claim 3, wherein The number of the exchange hole (43) is at least one, all the exchange holes (43) are the same or different in size, which is used for controlling the water flow rate of the hot water cavity (42) to the cold water cavity (41), so as to adjust the cooling efficiency.

5. The pressure relief cooling structure of claim 4, wherein The exchange hole (43) is located at the bottom of the partition plate.

6. The pressure relief cooling structure of claim 1, wherein The conduit (6) comprises a first conduit (61) and a second conduit (62), the first conduit (61) connects the water pump (5) and the support ring water inlet (21), and the second conduit (62) connects the water pump (5) and the water storage box water outlet (46).

7. An electric pressure cooker characterized by comprising: It comprises the pressure relief cooling structure according to any one of claims 1-6, and a pot cover, a heating device and a control circuit, the control circuit is configured to start the water pump (5) to perform cooling and pressure relief operation after cooking is finished.

8. The electric pressure cooker according to claim 7, characterized in that, The heating device is linked with the pressure relief cooling structure to control, and the heating is stopped and the water pump (5) is started to perform forced water cooling in the cooling stage.

9. The electric pressure cooker according to claim 7, characterized in that, The pot cover is provided with a safety lock mechanism, and can only be unlocked and opened when the pressure is reduced to normal pressure.

10. The electric pressure cooker according to claim 7, characterized in that, The water pump (5) is a variable-speed micro centrifugal pump, which can dynamically adjust the cooling water flow according to the temperature of the inner pot.

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