Pressure relief system of cooking equipment and cooking equipment

Abstract

The present invention relates to the technical field of kitchen appliances, and particularly relates to a pressure relief system for a cooking device and a cooking device. The pressure relief system includes: a pressure relief pipe having a pressure relief inlet and a pressure relief outlet, the pressure relief inlet being in communication with a cooking cavity, and the pressure relief outlet being in communication with the outside atmosphere; a compressor provided on the pressure relief pipe and adapted to compress a medium to be pressure relieved in the cooking cavity into a liquid medium; and a control device connected to the compressor and adapted to control the compressor to be turned on when cooking is completed, so that the medium to be pressure relieved in the cooking cavity enters the compressor from the pressure relief inlet. By providing the control device and the compressor on the pressure relief pipe, when cooking is completed, the steam in the cooking cavity can enter the compressor, and the compressor pressurizes the gaseous medium to compress it into a liquid medium. When the gaseous medium changes to a liquid medium, a large amount of heat is dissipated through the phase change, which can greatly improve the heat dissipation effect, make the pressure relief process more rapid, enable the user to enjoy the food faster, and improve the user experience.

Description

Technical Field

[0001] The present invention relates to the technical field of kitchen appliances, and particularly to a pressure relief system for a cooking device and a cooking device. Background Art

[0002] In existing cooking devices, especially for those with high-pressure requirements, enabling users to quickly enjoy delicious food has become an extreme demand in this fast-paced society. In the prior art, there have been many ways to relieve the high pressure that appears in the cooking cavity when cooking is completed, such as water-cooled pressure relief methods, air-cooled pressure relief methods, etc. The water-cooled pressure relief method is to set a water storage tank and a water pipe on the cover structure of the cooking device. When it is necessary to relieve the high pressure in the cooking cavity after cooking is completed, cold water is input into the water pipe through the water storage tank to cool down the high-pressure steam and reduce the pressure in the cooking cavity; the air-cooled pressure relief method is to set a cooling fan and cooling fins on the cover structure of the cooking device. When it is necessary to relieve the high pressure in the cooking cavity after cooking is completed, the cooling fan is turned on to cool down the high-pressure steam in the cooking cavity and reduce the pressure in the cooking cavity. However, whether it is the water-cooled pressure relief method or the air-cooled pressure relief method, they both indirectly exchange heat between another heat exchange medium and the high-pressure medium in the cooking cavity to reduce the pressure in the cooking cavity, with relatively low heat dissipation effect and slow pressure relief. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the existing pressure relief methods, which have low heat dissipation effect and slow pressure relief, so as to provide a pressure relief system for a cooking device and a cooking device with high heat dissipation effect and fast pressure relief.

[0004] The first aspect of the present invention provides a pressure relief system for a cooking device, including:

[0005] A pressure relief pipe having a pressure relief inlet and a pressure relief outlet, the pressure relief inlet being communicated with the cooking cavity of the cooking device, and the pressure relief outlet being communicated with the outside atmosphere;

[0006] At least one compressor provided on the pressure relief pipe and adapted to compress the medium to be pressure relieved in the cooking cavity into a liquid medium;

[0007] A control device connected to the compressor and adapted to control the compressor to start when cooking is completed, so that the medium to be pressure relieved in the cooking cavity enters the compressor from the pressure relief inlet.

[0008] The pressure relief pipe includes:

[0009] A pressure relief main pipe provided with the pressure relief inlet and the pressure relief outlet thereon;

[0010] At least one pressure relief branch pipe, connected to the pressure relief main pipe, and the compressor is provided on the pressure relief branch pipe.

[0011] The pressure relief system further includes:

[0012] A first valve, connected to the control device, provided on the pressure relief branch pipe, between the outlet of the compressor and the pressure relief main pipe;

[0013] And / or,

[0014] A second valve, provided on the pressure relief main pipe, between the two ends where the pressure relief branch pipe is connected to the pressure relief main pipe.

[0015] The first valve is a one-way valve, and / or the second valve is a two-way valve.

[0016] The pressure relief system further includes:

[0017] A gas-liquid separation device, provided on the pressure relief branch pipe, in front of the inlet of the compressor, adapted to separate the medium to be pressure-relieved into gas and liquid, so that the gaseous medium enters the compressor.

[0018] The pressure relief system further includes:

[0019] A pressure relief pump, provided on the pressure relief main pipe, between the connection end of the pressure relief branch pipe near the inlet of the compressor and the pressure relief outlet, adapted to pump the liquid medium at the outlet of the compressor and / or the liquid medium in the medium to be pressure-relieved into the cooking cavity.

[0020] The pressure relief system further includes a plurality of heat dissipation fins, provided on the outer shell of the compressor.

[0021] The pressure relief system further includes a heat dissipation fan, provided near the pressure relief outlet.

[0022] Four compressors are provided, arranged at intervals along the circumferential direction of the cooking cavity on the cover structure of the cooking device.

[0023] The pressure relief system further includes a detection device, connected to the control device, provided above the cooking cavity, and the detection device includes a pressure detection device, adapted to detect the pressure of the cooking cavity.

[0024] The detection device further includes a gas detector, and the gas detector is adapted to detect the content of the gaseous medium in the cooking cavity.

[0025] When the detection value of the pressure detection device is greater than 0 and the detection value of the gas detector is 1, the control device controls the compressor to shut down, the heat dissipation fan to start, and the medium to be pressure-relieved in the cooking cavity is discharged through the pressure relief main pipe;

[0026] And / or, when the detected value of the pressure detection device is greater than 0 and the detected value of the gas detector is 0, the control device controls the compressor to close, the pressure relief pump to start, and the cooling fan to start, and the medium to be depressurized in the cooking cavity is pumped into the cooking cavity by the pressure relief pump;

[0027] And / or, when the detected value of the pressure detection device is greater than 0 and the detected value of the gas detector is greater than 0 and less than 1, the control device controls the gas-liquid separation device to start, the compressor to start, the cooling fan to start, and the pressure relief pump to start. The liquid medium of the medium to be depressurized in the cooking cavity is pumped into the cooking cavity by the pressure relief pump, and the gaseous medium is compressed by the compressor and then becomes a liquid medium and is pumped into the cooking cavity by the pressure relief pump.

[0028] The second aspect of the present invention provides a cooking device, including the pressure relief system as described above.

[0029] The cooking device includes:

[0030] A cover body structure, on which the pressure relief pipe, the compressor and the control device are provided;

[0031] A pot body, connected below the cover body structure. The pot body has a cooking cavity, and a detection device is provided above the cooking cavity.

[0032] The cooking device is a pressure cooker.

[0033] The technical solution of the present invention has the following advantages:

[0034] 1. For the pressure relief system of the cooking device provided by the present invention, by setting a control device and a compressor on the pressure relief pipe, when cooking is completed, the steam in the cooking cavity can enter the compressor. The compressor pressurizes the gaseous medium to compress it into a liquid medium. When the gaseous medium changes to a liquid medium, a large amount of heat will be dissipated through phase change, which can greatly improve the heat dissipation effect, make the pressure relief process faster, enable users to enjoy delicious food faster, and improve the user experience.

[0035] 2. For the pressure relief system of the cooking device provided by the present invention, by setting the pressure relief pipe to include a pressure relief main pipe, a pressure relief branch pipe, and valves are respectively provided on the pressure relief main pipe and the pressure relief branch pipe. When depressurizing, the control device can control the opening and closing of the pressure relief main pipe and the pressure relief branch pipe by controlling the opening and closing of the valves according to the actual situation, which is convenient and fast.

[0036] 3. For the pressure relief system of the cooking device provided by the present invention, by setting a gas-liquid separation device in front of the inlet of the compressor, it is ensured that all the media entering the compressor are gaseous media, ensuring the normal use of the compressor and improving the service life of the compressor.

[0037] 4. The pressure relief system of the cooking device provided by the present invention is provided with a pressure relief pump on the main pressure relief pipe, so that the liquid medium can return to the cooking cavity, preventing liquid from overflowing and improving the user experience.

[0038] 5. The pressure relief system of the cooking device provided by the present invention is provided with heat dissipation fins on the outer shell of the compressor, which can greatly improve the heat dissipation effect when the compressor compresses the gaseous medium into a liquid medium.

[0039] 6. The pressure relief system of the cooking device provided by the present invention is provided with a heat dissipation fan, which can further provide heat dissipation power through the heat dissipation fan to quickly take away the heat dissipated during the operation of the compressor. The heat dissipation method is reliable and rapid.

[0040] 7. The pressure relief system of the cooking device provided by the present invention has four compressors spacedly arranged on the cover structure of the cooking device, so that the compressors are arranged circumferentially around the cooking cavity. During pressure relief, the medium to be pressure relieved on the cooking cavity can be quickly sucked into the compressor for pressure relief, ensuring the pressure relief effect.

[0041] 8. The pressure relief system of the cooking device provided by the present invention is provided with a pressure detection device and a gas detector connected to the control device, which can accurately control the opening or closing of the compressor, heat dissipation fan, pressure relief pump, etc. according to the pressure in the cooking cavity and the content of the gaseous medium, so as to select different pressure relief methods for different situations, making the pressure relief faster and safer.

[0042] 9. In the pressure relief system of the cooking device provided by the present invention, when the detection value of the pressure detection device is greater than 0 and the detection value of the gas detector is 1, that is, the medium to be pressure relieved is all gaseous medium. At this time, the control device controls the heat dissipation fan to start, and only the heat dissipation fan is used to dissipate the heat of the medium to be pressure relieved. There will be no problem of liquid leakage, and there is no need to start the compressor, making the energy efficiency of the pressure relief system higher; when the detection value of the pressure detection device is greater than 0 and the detection value of the gas detector is 0, that is, the medium to be pressure relieved is all liquid medium. At this time, the control device controls the pressure relief pump to start, dissipate the heat of the medium to be pressure relieved through the heat dissipation fan, and pump the liquid medium back into the cooking cavity through the pressure relief pump to prevent liquid leakage; when the detection value of the pressure detection device is greater than 0 and the detection value of the gas detector is greater than 0 and less than 1, that is, the medium to be pressure relieved is a gas-liquid mixed medium. At this time, the control device controls the gas-liquid separation device, compressor, heat dissipation fan and pressure relief pump to start, so that the gas-liquid separation device can separate the gas-liquid mixed medium, and only the gaseous medium enters the compressor. Cooperating with the heat dissipation fan and the heat dissipation fins outside the compressor, the heat dissipation effect is greatly improved. By pumping the liquid medium back into the cooking cavity, the leakage of liquid is prevented and the user experience is improved. Description of the Drawings

[0043] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0044] Figure 1 A cross-sectional view of the cooking device of the present invention;

[0045] Figure 2 is Figure 1 a partial enlarged view of;

[0046] Figure 3 A schematic structural view of the compressor and heat dissipation fins of the cooking device of the present invention;

[0047] Figure 4 A schematic partial structural view of the cooking device of the present invention;

[0048] Figure 5 A schematic structural view of the cooking device of the present invention equipped with a heat dissipation fan.

[0049] Explanation of reference numerals:

[0050] 1 - Pressure relief inlet; 2 - Pressure relief outlet; 3 - Cooking cavity; 4 - Compressor; 5 - Main pressure relief pipe; 6 - Pressure relief branch pipe; 7 - First valve; 8 - Second valve; 9 - Pressure relief pump; 10 - Heat dissipation fins; 11 - Heat dissipation fan; 12 - Cover structure; 13 - Pot body. Specific embodiments

[0051] The following will clearly and completely describe the technical solutions of the present invention with reference to the drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0052] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0053] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0054] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0055] As Figure 1 - Figure 5 As shown, in this embodiment, a pressure relief system for a cooking device is provided, including: a pressure relief pipe having a pressure relief inlet 1 and a pressure relief outlet 2, the pressure relief inlet 1 being in communication with the cooking cavity 3 of the cooking device, and the pressure relief outlet 2 being in communication with the outside atmosphere; at least one compressor 4 provided on the pressure relief pipe and adapted to compress the medium to be pressure-relieved in the cooking cavity 3 into a liquid medium; and a control device connected to the compressor 4 and adapted to control the compressor 4 to start when cooking is completed, so that the medium to be pressure-relieved in the cooking cavity 3 enters the compressor 4 from the pressure relief inlet 1.

[0056] By providing a control device and a compressor 4 on the pressure relief pipe, when cooking is completed, the steam in the cooking cavity 3 can enter the compressor 4. The compressor 4 pressurizes the gaseous medium and compresses it into a liquid medium. When the gaseous medium changes to a liquid medium, a large amount of heat is dissipated through phase change, which can greatly improve the heat dissipation effect, make the pressure relief process faster, enable the user to enjoy the food faster, and improve the user experience.

[0057] Specifically, as Figure 2 shown, the pressure relief pipe in this embodiment includes: a pressure relief main pipe 5 provided with a pressure relief inlet 1 and a pressure relief outlet 2 thereon; four pressure relief branch pipes 6 connected to the pressure relief main pipe 5, and each pressure relief branch pipe 6 is provided with a compressor 4. The four pressure relief branch pipes 6 and the four compressors 4 are evenly spaced along the circumferential direction of the cooking cavity 3 on the cover structure 12 of the cooking device. By setting the compressor 4 and the pressure relief branch pipes 6 to four and evenly spacing them on the cover structure 12 of the cooking device, the compressors 4 are arranged in the circumferential direction of the cooking cavity 3. During pressure relief, the medium to be pressure-relieved on the cooking cavity 3 can be quickly sucked into the compressor 4 for pressure relief, ensuring the pressure relief effect. As an alternative embodiment, it can also be that the pressure relief branch pipes 6 and the compressors 4 are set to 1, 2, 3 or more, and can be specifically set according to the space on the cover structure 12 of the cooking device. As an alternative embodiment, it can also be that the pressure relief branch pipes 6 and the compressors 4 are unevenly spaced along the circumferential direction of the cooking cavity 3.

[0058] To facilitate the control of the opening or closing of the pressure relief main pipe 5 and the pressure relief branch pipe 6, the pressure relief system in this embodiment further includes: a first valve 7, connected to the control device, the first valve 7 is arranged on the pressure relief branch pipe 6, between the outlet of the compressor 4 and the pressure relief main pipe 5; a second valve 8, arranged on the pressure relief main pipe 5, between the two ends where the pressure relief branch pipe 6 is connected to the pressure relief main pipe 5. Specifically, the first valve 7 is an electromagnetic check valve, so that the medium compressed by the compressor 4 can only flow from the compressor 4 to the pressure relief main pipe 5, and will not flow back to the compressor 4. The second valve 8 is an electromagnetic two-way valve. By setting the pressure relief pipe to include the pressure relief main pipe 5, the pressure relief branch pipe 6 and valves respectively arranged on the pressure relief main pipe 5 and the pressure relief branch pipe 6, when relieving pressure, the control device can control the opening and closing of the pressure relief main pipe 5 and the pressure relief branch pipe 6 by controlling the opening and closing of the valves according to the actual situation, which is convenient and fast. As an alternative implementation, it can also be that the first valve 7 and the second valve 8 are other forms of valves.

[0059] The pressure relief system in this embodiment further includes: a gas-liquid separation device, arranged on the pressure relief branch pipe 6, in front of the inlet of the compressor 4, suitable for separating the medium to be pressure relieved into gas and liquid, so that the gaseous medium enters the compressor 4. Specifically, the gas-liquid separation device is a gas-liquid separator. By arranging the gas-liquid separation device in front of the inlet of the compressor 4, it is ensured that the medium entering the compressor 4 is all gaseous medium, ensuring the normal use of the compressor 4 and improving the service life of the compressor 4.

[0060] As Figure 2 shown, the pressure relief system in this embodiment further includes: a pressure relief pump 9, arranged on the pressure relief main pipe 5, between the connection end of the pressure relief branch pipe 6 near the inlet of the compressor 4 and the pressure relief main pipe 5 and the pressure relief outlet 2, suitable for pumping the liquid medium at the outlet of the compressor 4 and / or the liquid medium in the medium to be pressure relieved into the cooking cavity 3. Specifically, the pressure relief pump 9 is arranged between the connection end of the pressure relief branch pipe 6 near the outlet of the compressor 4 and the pressure relief main pipe 5 and the pressure relief outlet 2. By arranging the pressure relief pump 9 on the pressure relief main pipe 5, the liquid medium can return to the cooking cavity 3, preventing liquid overflow and improving the user experience. The pressure relief pump 9 can be set to pump the medium inwards or outwards according to the actual situation. As an alternative implementation, it can also be that the pressure relief pump 9 is arranged between the two ends where the pressure relief branch pipe 6 is connected to the pressure relief main pipe 5.

[0061] To improve the heat dissipation effect when the compressor 4 compresses, as Figure 3 shown, the pressure relief system in this embodiment further includes a multi-layer heat dissipation fin 10, arranged on the outer shell of the compressor 4. Specifically, the multi-layer heat dissipation fin 10 is integrally formed on the outer shell of the compressor 4. As an alternative implementation, it can also be that one layer of heat dissipation fin 10 is arranged.

[0062] As Figure 2 andFigure 5 As shown in the figure, the pressure relief system in this embodiment further includes a cooling fan 11, which is arranged near the pressure relief outlet 2. Specifically, a central hole for the main pressure relief pipe 5 to pass through is provided at the hub center of the cooling fan 11, so that the setting of the cooling fan 11 and the main pressure relief pipe 5 will not interfere with each other. By setting the cooling fan 11, the cooling fan 11 can further provide cooling power to quickly take away the heat dissipated during the operation of the compressor 4, and the cooling method is reliable and fast. As a changeable implementation manner, it can also be that the cooling fan 11 is arranged at other positions of the cover structure 12 of the cooking device, as long as it does not interfere with the pressure relief pipe.

[0063] The pressure relief system in this embodiment further includes a detection device, which is connected to the control device and is arranged above the cooking cavity 3. The detection device includes a pressure detection device and a gas detector. The pressure detection device is suitable for detecting the pressure in the cooking cavity 3, and the gas detector is suitable for detecting the content of the gaseous medium in the cooking cavity 3. Specifically, the pressure detection device can be a pressure sensor. As a changeable implementation manner, it can also be that only the pressure detection device or the gas detector is set for the detection device. As a changeable implementation manner, it can also be that the gas detector is replaced by a gas-liquid ratio detector, which can directly detect the ratio of the gaseous medium to the liquid medium. As a changeable implementation manner, it can also be that instead of setting a detection device, a timing device is set to cooperate with the control device to realize the control of the pressure relief method.

[0064] When cooking is completed and pressure relief is required, the medium to be pressure relieved in the cooking cavity 3 of the cooking device may be a gaseous medium, a liquid medium or a gas-liquid mixed medium. By setting a pressure detection device and a gas detector connected to the control device, it is possible to accurately control the opening or closing of the compressor 4, the cooling fan 11, the pressure relief pump 9, etc. according to the pressure and gas-liquid ratio in the cooking cavity 3, so as to select different pressure relief methods for different situations, making the pressure relief faster and safer. The specific pressure relief methods are as follows:

[0065] When the detection value of the pressure detection device is greater than 0 and the detection value of the gas detector is 1, the control device controls the compressor 4 to close, the cooling fan 11 to turn on, the first valve 7 to close, and the second valve 8 to open. The medium to be pressure relieved in the cooking cavity 3 is discharged through the main pressure relief pipe 5. At this time, the medium to be pressure relieved is all gaseous medium. The control device controls the cooling fan 11 to turn on, and only the cooling fan 11 is used to cool the medium to be pressure relieved, so there will be no problem of liquid leakage, and there is no need to turn on the compressor 4, making the energy efficiency of the pressure relief system higher.

[0066] When the detected value of the pressure detection device is greater than 0 and the detected value of the gas detector is 0, the control device controls the compressor 4 to close, the pressure relief pump 9 to start, the cooling fan 11 to start, both the first valve 7 and the second valve 8 to close, and the medium to be pressure-relieved in the cooking cavity 3 is pumped into the cooking cavity 3 by the pressure relief pump 9. At this time, the medium to be pressure-relieved is all liquid medium. The control device controls the pressure relief pump 9 to start, dissipates the heat of the liquid medium to be pressure-relieved through the cooling fan 11, and pumps the liquid medium back into the cooking cavity 3 through the pressure relief pump 9, preventing liquid leakage.

[0067] When the detected value of the pressure detection device is greater than 0 and the detected value of the gas detector is greater than 0 and less than 1, the control device controls the gas-liquid separation device to start, the compressor 4 to start, the cooling fan 11 to start, the pressure relief pump 9 to start, both the first valve 7 and the second valve 8 to start. The liquid medium of the medium to be pressure-relieved in the cooking cavity 3 is pumped into the cooking cavity 3 by the pressure relief pump 9, and the gaseous medium is compressed by the compressor 4 and then becomes a liquid medium and is pumped into the cooking cavity 3 by the pressure relief pump 9. At this time, that is, the medium to be pressure-relieved is a gas-liquid mixed medium. The control device controls the gas-liquid separation device, the compressor 4, the cooling fan 11 and the pressure relief pump 9 to start, so that the gas-liquid separation device can perform gas-liquid separation on the gas-liquid mixed medium, only allowing the gaseous medium to enter the compressor 4, and cooperating with the cooling fan 11 and the cooling fins 10 outside the compressor 4, greatly improving the heat dissipation effect. By pumping the liquid medium back into the cooking cavity 3, liquid leakage is prevented, improving the user experience.

[0068] When the detected value of the pressure detection device is 0, the control device controls the entire pressure relief system to close, and the pressure relief ends.

[0069] As Figure 4 and Figure 5 shown, the second aspect of the present invention provides a cooking device, including the pressure relief system as described above.

[0070] Among them, the cooking device includes: a cover body structure 12, which is provided with a pressure relief pipe, a compressor 4 and a control device; a pot body 13, connected below the cover body structure 12, the pot body 13 has a cooking cavity 3, and a detection device is provided above the cooking cavity 3.

[0071] Specifically, the cooking device is a pressure cooker. As an alternative embodiment, it can also be that the cooking device is a rice cooker.

[0072] Obviously, the above embodiments are only examples given for clear illustration, and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A pressure relief system for a cooking device, characterized in that, Comprising: A pressure relief pipe, having a pressure relief inlet (1) and a pressure relief outlet (2), wherein the pressure relief inlet (1) is in communication with the cooking cavity (3) of the cooking device, and the pressure relief outlet (2) is in communication with the outside atmosphere; At least one compressor (4), provided on the pressure relief pipe, adapted to compress the medium to be pressure-relieved in the cooking cavity (3) into a liquid medium; A control device, connected to the compressor (4), adapted to control the compressor (4) to start when cooking is completed, so that the medium to be pressure-relieved in the cooking cavity (3) enters the compressor (4) from the pressure relief inlet (1); The pressure relief pipe includes: A main pressure relief pipe (5), on which the pressure relief inlet (1) and the pressure relief outlet (2) are provided; At least one pressure relief branch pipe (6), connected to the main pressure relief pipe (5), and the compressor (4) is provided on the pressure relief branch pipe (6); The pressure relief system further includes: A pressure relief pump (9), provided on the main pressure relief pipe (5), between the connection end of the pressure relief branch pipe (6) near the inlet of the compressor (4) and the pressure relief outlet (2), adapted to pump the liquid medium at the outlet of the compressor (4) and / or the liquid medium in the medium to be pressure-relieved into the cooking cavity (3); A detection device, connected to the control device, provided above the cooking cavity (3), the detection device includes a pressure detection device, adapted to detect the pressure of the cooking cavity (3); The detection device further includes a gas detector, the gas detector is adapted to detect the content of the gaseous medium in the cooking cavity (3); when the detection value of the pressure detection device is greater than 0 and the detection value of the gas detector is 1, the control device controls the compressor (4) to close and the cooling fan (11) to start, and the medium to be pressure-relieved in the cooking cavity (3) is discharged from the main pressure relief pipe (5); And / or, when the detection value of the pressure detection device is greater than 0 and the detection value of the gas detector is 0, the control device controls the compressor (4) to close, the pressure relief pump (9) to start, and the cooling fan (11) to start, and the medium to be pressure-relieved in the cooking cavity (3) is pumped into the cooking cavity (3) by the pressure relief pump (9); And / or, when the detection value of the pressure detection device is greater than 0 and the detection value of the gas detector is greater than 0 and less than 1, the control device controls the gas-liquid separation device to start, the compressor (4) to start, the cooling fan (11) to start, and the pressure relief pump (9) to start, and the liquid medium of the medium to be pressure-relieved in the cooking cavity (3) is pumped into the cooking cavity (3) by the pressure relief pump (9), and the gaseous medium is compressed by the compressor (4) and then becomes a liquid medium and is pumped into the cooking cavity (3) by the pressure relief pump (9).

2. The pressure relief system of the cooking device according to claim 1, wherein, Further comprising: A first valve (7), connected to the control device, the first valve (7) is provided on the pressure relief branch pipe (6), between the outlet of the compressor (4) and the main pressure relief pipe (5); And / or, The second valve (8) is provided on the pressure relief main pipe (5) and is located between the two ends where the pressure relief branch pipe (6) is connected to the pressure relief main pipe (5).

3. The pressure relief system of the cooking device according to claim 2, characterized in that, The first valve (7) is a one-way valve, and / or the second valve (8) is a two-way valve.

4. The pressure relief system of the cooking device according to claim 1, characterized in that, It further includes: A gas-liquid separation device is provided on the pressure relief branch pipe (6) and is located in front of the inlet of the compressor (4). It is adapted to separate the medium to be pressure-relieved into gas and liquid so that the gaseous medium enters the compressor (4).

5. The pressure relief system of the cooking device according to any one of claims 1-4, characterized in that, It further includes a plurality of heat dissipation fins (10) provided on the outer shell of the compressor (4).

6. The pressure relief system of the cooking device according to any one of claims 1-4, characterized in that, It further includes a heat dissipation fan (11) provided near the pressure relief outlet (2).

7. The pressure relief system of the cooking device according to any one of claims 1-4, characterized in that, Four compressors (4) are provided and are arranged at intervals along the circumferential direction of the cooking cavity (3) on the cover structure (12) of the cooking device.

8. A cooking device, characterized in that, It includes the pressure relief system according to any one of claims 1-7.

9. The cooking device according to claim 8, wherein , The cooking device includes: A cover structure (12) on which the pressure relief pipe, the compressor (4) and the control device are provided; A pot body (13) is connected below the cover structure (12). The pot body (13) has a cooking cavity (3), and a detection device is provided above the cooking cavity (3).

10. The cooking device according to claim 8 or 9, characterized in that , The cooking device is a pressure cooker.

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