A steam cooking device and its control method

Abstract

The present invention provides a steam cooking device and a control method thereof. The steam cooking device includes: a steam generator adapted to generate steam, a steam pipe connected to the steam generator, and one end of the steam pipe acting in the cooking cavity; an air intake pipe, one end of which acts in the inner container; and an exhaust pump acting on the air intake pipe and adapted to form a negative pressure inside the air intake pipe. In the present invention, by providing the exhaust pump and the air intake pipe, the high-temperature steam in the inner container can be discharged in time, thereby helping to reduce the temperature in the inner container and avoiding the steam from rushing out when the inner container is opened, causing thermal burns to the user's hands or face.

Description

Technical Field

[0001] The present invention relates to the technical field of cooking equipment, and particularly relates to a steam cooking device and a control method thereof. Background Art

[0002] As a traditional food cooking medium, steam has been widely applied in steam cooking devices such as steam ovens and steam convection ovens.

[0003] Since the principle of cooking food with steam is to use high-temperature steam to heat the food, but after cooking is completed, the temperature inside the oven cavity will remain high for a period of time. At this time, it is difficult to quickly eliminate the high-temperature steam. For some impatient users, they will open the cabinet door immediately after the steam cooking device finishes cooking. At this time, the high-temperature steam remaining in the oven cavity will directly rush out and may act on areas such as the user's hands and face, posing a risk of scalding to the user. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the high-temperature steam inside the oven cavity of the existing steam cooking device cannot be eliminated in time after cooking is completed, which may cause scalding to the user.

[0005] To this end, the present invention provides a steam cooking device, including: an inner container, with a cooking cavity adapted to place food provided therein; a steam generator adapted to generate steam, a steam pipe connected to the steam generator, and one end of the steam pipe acting in the cooking cavity; an air suction pipe, one end of which acts in the inner container; an exhaust pump acting on the air suction pipe and adapted to form a negative pressure inside the air suction pipe.

[0006] For the steam cooking device provided by the present invention, the air suction pipe includes: a first air suction pipe, one end of which is connected to the inner container and the other end is connected to the exhaust pump; an exhaust gas discharge pipe, one end of which is connected to the exhaust pump and the other end extends out of the outside of the inner container.

[0007] The steam cooking device provided by the present invention further includes: a waste water pipe, one end of which is connected to the steam generator; a waste water pump connected to the other end of the waste water pipe; a waste water discharge pipe provided on the waste water pump for discharging waste water to the outside.

[0008] For the steam cooking device provided by the present invention, the waste water pipe includes a first waste water pipe and a second waste water pipe, one end of the second waste water pipe is connected to the waste water pump, the first air suction pipe includes a second air suction pipe and a third air suction pipe, and one end of the third air suction pipe is connected to the exhaust pump; the steam cooking device further includes: a two-position four-way solenoid valve, two inlet ends of the two-position four-way solenoid valve are connected to the first waste water pipe and the second air suction pipe, and two outlet ends of the two-position four-way solenoid valve are respectively connected to the second waste water pipe and the third air suction pipe.

[0009] The steam cooking device provided by the present invention further includes: a drain valve assembly, which is provided with a water inlet, and the water inlet is arranged at the bottom wall position of the inner container. The condensed water flowing through the bottom wall of the inner container is adapted to enter the inside of the drain valve assembly through the water inlet, and the air guide pipe is communicated with the drain valve assembly.

[0010] For the steam cooking device provided by the present invention, the drain valve assembly includes: a base, which is internally provided with a receiving cavity; an elastic member, one end of which abuts against the receiving cavity; a sliding cover, which is arranged at the other end of the elastic member and can move in the receiving cavity under the drive of the elastic member; and a top cover, which is pressed on the sliding cover and connected to the base.

[0011] The steam cooking device provided by the present invention further includes: a spring seat, which is arranged in the receiving cavity, and the spring seat is provided with a water permeable part, and the elastic member is installed on the spring seat.

[0012] For the steam cooking device provided by the present invention, a hollow part is arranged in the middle of the top cover, a filter screen cover is arranged in the hollow part, and a filter screen is arranged on the filter screen cover.

[0013] For the steam cooking device provided by the present invention, the filter screen cover includes a support frame, the filter screen is arranged on the support frame, and a handle is arranged on the top surface of the support frame.

[0014] For the steam cooking device provided by the present invention, a sealing ring is arranged at a position on the inner wall of the top cover corresponding to the sliding cover, and the sliding cover is adapted to move relative to the sealing ring under the action of a waste water pump and the elastic member.

[0015] For the steam cooking device provided by the present invention, a water level probe is arranged on the sliding cover, and the water level probe is communicatively connected with the waste water pump.

[0016] For the steam cooking device provided by the present invention, a door body is arranged on the inner container, and a door lock is arranged on the door body. The steam cooking device further includes: a temperature sensor, which is adapted to detect the temperature inside the inner container, and the temperature sensor is communicatively connected with the exhaust pump and the door lock.

[0017] The steam cooking device provided by the present invention is a steam oven.

[0018] The present invention provides a control method for a steam cooking device. The steam cooking device includes an inner container, and a door body is arranged on the inner container. The inner container is communicated with an exhaust pump. The method includes the following steps:

[0019] Obtain a cooking completion signal of the food to be cooked;

[0020] Obtain an opening signal of the door body;

[0021] Obtain the temperature of the inner container;

[0022] When the temperature of the inner container is higher than a preset temperature value, control the exhaust pump to start.

[0023] For the steam cooking device control method provided by the present invention, a door lock is provided on the door body of the inner container. In the step of controlling the exhaust pump to start when the temperature of the inner container is higher than the preset temperature value, it further includes: controlling the door lock to lock.

[0024] The technical solution of the present invention has the following advantages:

[0025] 1. The steam cooking device provided by the present invention includes: a steam generator adapted to generate steam, a steam pipe connected to the steam generator, and one end of the steam pipe acting in the cooking cavity; an air inlet pipe with one end acting in the inner container; an exhaust pump acting on the air inlet pipe and adapted to form a negative pressure inside the air inlet pipe.

[0026] In the present invention, by providing an exhaust pump and an air inlet pipe, the high-temperature steam in the inner container can be discharged in time, which helps to reduce the temperature in the inner container and can avoid the steam rushing out when the inner container is opened, causing thermal burns to the user's hands or face.

[0027] 2. For the steam cooking device provided by the present invention, the waste water pipe includes a first waste water pipe and a second waste water pipe. One end of the second waste water pipe is connected to the waste water pump. The first air inlet pipe includes a second air inlet pipe and a third air inlet pipe. One end of the third air inlet pipe is connected to the exhaust pump; two inlet ends of the two-position four-way solenoid valve are connected to the first waste water pipe and the second air inlet pipe, and two outlet ends of the two-position four-way solenoid valve are respectively connected to the second waste water pipe and the third air inlet pipe.

[0028] In the prior art, high-temperature steam will exchange heat with the inner cavity, food, cabinet door, etc. with lower temperature, thereby generating condensed water, which will collect at the bottom of the inner cavity. Tiny water droplets will also slowly drop under the influence of gravity to form water beads. As time goes by, there will be more and more waste water at the bottom of the inner cavity. And part of the food residues and oil stains will flow to the bottom of the inner cavity along with the condensed water to form an oil-water mixture. The condensed water and the oil-water mixture accumulate inside the steam cooking device, which will cause food spoilage and thus affect the health of users.

[0029] In the present invention, by providing a two-position four-way solenoid valve, a second air intake pipe, a second waste water pipe, and a waste water pump, the condensed water in the inner tank can be drained. After the waste water pump is started, the condensed water in the inner tank will sequentially enter the second air intake pipe, the two-position four-way solenoid valve, and the second waste water pipe, and enter the waste water outlet pipe under the drive of the waste water pump, so as to realize the drainage operation of the condensed water in the inner tank, and avoid problems such as food spoilage and peculiar smell caused by the residue of condensed water in the inner tank.

[0030] Through the above setting method, the drainage operations of the waste water in the steam generator and the condensed water in the inner tank can be realized by one waste water pump, which can effectively save the space occupied by the steam cooking device, thereby improving the structural compactness of the entire steam cooking device.

[0031] At the same time, when the third air intake pipe, the fourth air intake pipe, and the two-position four-way solenoid valve are conducted, the discharge operation of the high-temperature steam in the inner tank can be realized.

[0032] Through the above setting method, the drainage of the condensed water in the inner tank, the high-temperature steam in the inner tank, and the waste water in the steam generator are independent of each other, and interference with each other is avoided.

[0033] The independent different branches can effectively reduce the interference with the cooking process. For example, when draining the waste water in the steam generator, the two branches of the condensed water and the high-temperature steam are controlled to be disconnected, so as to avoid the high-temperature steam in the inner tank being sucked out to the outside under the negative pressure, resulting in a decrease in the temperature in the inner tank and ultimately having an adverse effect on the food cooking effect.

[0034] 3. The steam cooking device provided by the present invention, a hollow part is provided in the middle of the top cover, a filter screen cover is provided on the hollow part, and a filter screen is provided on the filter screen cover.

[0035] By providing a filter screen, blocky sundries in the condensed water, such as food residues, etc., will not enter the inside of the drain valve assembly, thereby further causing the connecting pipe to be blocked.

[0036] By providing a filter screen, it helps to ensure the smoothness of the connecting pipe, thereby further ensuring the smoothness and stability during the pumping operation of the drain valve assembly.

[0037] 4. The steam cooking device provided by the present invention, a water level probe is provided on the sliding cover, and the water level probe is communicatively connected with the waste water pump.

[0038] By setting a water level probe, when the water level monitored by the water level probe exceeds the preset water level, it will send a signal to the wastewater pump. The wastewater pump starts and drives the drain valve assembly to open. At this time, the condensate water inside the drain valve assembly will be discharged through the drain valve assembly, thereby effectively improving the discharge efficiency of the condensate water.

[0039] 5. The cooking device control method provided by the present invention, the steam cooking device includes an inner container, a door body is arranged on the inner container, and the inner container is communicated with an exhaust pump, and includes the following steps: obtaining a cooking completion signal of the food to be cooked; obtaining an opening signal of the door body; obtaining the temperature of the inner container;

[0040] When the temperature of the inner container is higher than the preset temperature value, control the exhaust pump to start.

[0041] When the opening signal of the door body is detected, control the exhaust pump to start. At this time, the high-temperature steam in the inner container will be discharged. As the high-temperature steam is discharged, the temperature of the inner container gradually decreases. When the temperature drops to the preset temperature value, control the door lock to unlock. After the user opens the door, due to the negative pressure in the inner container, the low-temperature wind outside will quickly enter the inner container to cool the inner container. At the same time, due to the existence of the negative pressure, the high-temperature steam will not rush towards the user, thereby avoiding thermal burns to the user.

[0042] 6. The cooking device control method provided by the present invention, a door lock is arranged on the door body of the inner container. In the step of controlling the exhaust pump to start when the temperature of the inner container is higher than the preset temperature value, it further includes: controlling the door lock to lock. When the temperature of the inner container is higher than the preset temperature value, the door lock is locked, thereby avoiding the high-temperature steam in the inner container from rushing out and causing adverse effects on the hands and face of the user. 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 to be used in the description of the specific embodiments or the prior art. Obviously, the following drawings 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 It is a schematic structural diagram of the steam cooking device provided by the present invention;

[0045] Figure 2 is Figure 1 an assembly schematic diagram of structures such as a steam generator in the shown steam cooking device;

[0046] Figure 3 is Figure 1Schematic structural diagram of the drainage valve assembly provided therein;

[0047] Figure 4 Schematic structural diagram of the drainage valve assembly provided by the present invention in a non-draining state;

[0048] Figure 5 Schematic structural diagram of the drainage valve assembly provided by the present invention in a draining state.

[0049] Description of reference numerals:

[0050] 1. Inner tank; 2. Steam generator; 3. Steam pipe; 4. Drainage valve assembly; 41. Base; 411. Thread; 42. Spring; 43. Slide cover; 44. Top cover; 45. Spring seat; 451. Snap; 46. Filter screen cover; 47. Filter screen; 48. Handle; 49. Sealing ring;

[0051] 5. First air intake pipe; 51 - Second air intake pipe; 52 - Third air intake pipe; 6. Exhaust gas discharge pipe; 7. Waste water pump; 8. Exhaust pump; 9. Waste water pipe; 91. First waste water pipe; 92. Second waste water pipe; 10. Two-position four-way solenoid valve; 11. Pure water pump; 12. Pure water pipe, 13. Waste water lead-out pipe; 14. Gasket. Detailed implementation manners

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

[0053] 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 accompanying drawings, and 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 cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0054] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" 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 a direct connection or an indirect connection 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 circumstances.

[0055] 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.

[0056] Embodiment

[0057] This embodiment provides a steam cooking device. As Figures 1-5 shown, in this embodiment, the steam cooking device can be a steam box, a steam oven, or a steamer. As long as it can realize the cooking device that performs cooking operations through steam, it is the steam cooking device in this embodiment.

[0058] The steam cooking device will generate high-temperature steam through the steam generator 2, and the high-temperature steam will exchange heat with the relatively lower-temperature inner cavity, food, cabinet door, etc.

[0059] In this embodiment, the steam cooking device includes:

[0060] The inner container 1 is made of a metal material itself, such as stainless steel, etc. The ingredients to be cooked are placed in the inner container 1. Specifically, a steaming rack can also be provided in the inner container 1, and the inner container 1 is divided in the height direction through the steaming rack, so as to form different cooking spaces.

[0061] A door body is provided on the inner container 1, a door lock is provided on the door body, a temperature sensor is provided on the door body or the inner container, and is adapted to detect the temperature inside the inner container. The temperature sensor is communicatively connected to the exhaust pump and the door lock.

[0062] Specifically, the door lock itself is an electromagnetic lock, which can be controlled by the temperature sensor and perform locking or unlocking operations on the door body.

[0063] A steam generator 2, which is adapted to generate steam. A steam pipe 3 is connected to the steam generator 2, and one end of the steam pipe 3 acts in the cooking cavity;

[0064] In this embodiment, the structure of the steam generator 2 is not limited as long as it can generate steam. The steam generator 2 can be arranged outside the inner container 1 or inside the inner container 1. Preferably, the steam generator 2 is arranged on the outer wall of the inner container 1, and the steam generated by the steam generator 2 is introduced into the inner container 1 through the steam pipe 3, so as to realize steaming the food materials in the inner container 1.

[0065] In this embodiment, in order to realize the water supply operation to the steam generator 2, a purified water pump 11 is arranged on the steam generator 2, a purified water pipe 12 is connected to the purified water pump 11, and the purified water pipe 12 is connected to the external purified water by itself. The external water is introduced into the steam generator 2 through the purified water pump 11 and then vaporized in the steam generator 2.

[0066] An air inlet pipe, one end of which acts in the inner container;

[0067] An exhaust pump 8 acts on the air inlet pipe and is adapted to form a negative pressure inside the air inlet pipe.

[0068] By arranging the exhaust pump and the air inlet pipe, the high-temperature steam in the inner container can be discharged in time, which helps to reduce the temperature in the inner container and can avoid the steam gushing out when the inner container is opened, causing thermal burns to the user's hands or face.

[0069] Specifically, the air inlet pipe itself is made of a flexible pipe, and the installation position of the exhaust pump is not limited. It can be arranged inside the inner container or outside the inner container. Preferably, the exhaust pump is arranged on the outer side wall of the inner container and can be fixed by means of screws or the like.

[0070] In this embodiment, in order to realize the sealed connection between the exhaust pump and the air inlet pipe, the air inlet pipe includes: a first air inlet pipe 5, one end of which is connected to the inner container and the other end is connected to the exhaust pump; an exhaust gas discharge pipe 6, one end of which is connected to the exhaust pump and the other end extends outside the inner container.

[0071] Specifically, as Figure 2 shown, the lower end of the first air inlet pipe extends into the inner container, and the upper end of the exhaust gas discharge pipe extends outside the inner container. It can be directly connected to the external atmosphere or introduced into a storage box, and the high-temperature steam is cooled inside the storage box, so as to realize the recovery of the high-temperature steam.

[0072] Furthermore, in this embodiment, it further includes:

[0073] A waste water pipe 9, one end of which is connected to the steam generator;

[0074] Before or after the steam generator is used, there is usually wastewater residue inside it. The wastewater staying inside the steam generator will cause corrosion of the inner wall of the steam generator. Therefore, it is necessary to drain out the wastewater;

[0075] A wastewater pump is connected to the other end of the wastewater pipe;

[0076] Specifically, the wastewater pump is arranged on the outer wall of the inner tank to provide suction for the wastewater.

[0077] A wastewater outlet pipe 13 is arranged on the wastewater pump 7 to lead the wastewater to the outside.

[0078] In this embodiment, the wastewater pipe includes a first wastewater pipe 91 and a second wastewater pipe 92. One end of the second wastewater pipe is connected to the wastewater pump. The first air outlet pipe includes a second air outlet pipe and a third air outlet pipe. One end of the third air outlet pipe is connected to the exhaust pump. Two inlet ends of the two-position four-way solenoid valve 10 are connected to the first wastewater pipe and the second air outlet pipe. Two outlet ends of the two-position four-way solenoid valve 10 are respectively connected to the second wastewater pipe and the third air outlet pipe.

[0079] The high-temperature steam will exchange heat with the relatively low-temperature inner cavity, food, cabinet door, etc., thus generating condensate. This condensate will collect at the bottom of the inner cavity. Tiny water droplets will also slowly descend under the influence of gravity to form water beads. Over time, there will be more and more wastewater at the bottom of the inner cavity. And part of the food residue and oil stains will flow to the bottom of the inner cavity along with the condensate, forming an oil-water mixture. The condensate and the oil-water mixture accumulating inside the steam cooking device will cause food spoilage, which will further affect the health of users.

[0080] In this embodiment, by setting the two-position four-way solenoid valve, the second air outlet pipe, the second wastewater pipe and the wastewater pump, the condensate in the inner tank can be drained out. After the wastewater pump is started, the condensate in the inner tank will sequentially enter the second air outlet pipe, the two-position four-way solenoid valve and the second wastewater pipe, and be led into the wastewater outlet pipe under the drive of the wastewater pump, so as to realize the drainage operation of the condensate in the inner tank and avoid problems such as food spoilage and peculiar smell caused by the residue of condensate in the inner tank.

[0081] Through the above setting method, the waste water in the steam generator and the condensed water in the inner tank can be discharged by one waste water pump, which can effectively save the space occupied by the steam cooking device, thereby improving the structural compactness of the entire steam cooking device. At the same time, when the third air guide pipe, the fourth air guide pipe and the two-position four-way solenoid valve are conducted, the discharge operation of the high-temperature steam in the inner tank can be realized. Through the above setting method, the discharge of the condensed water in the inner tank, the high-temperature steam in the inner tank and the waste water in the steam generator are independent of each other, and interference between them is avoided. The independent different branches can effectively reduce the interference to the cooking process. For example, when discharging the waste water in the steam generator, the two branches of the condensed water and the high-temperature steam are controlled to be disconnected, so as to avoid the high-temperature steam in the inner tank being sucked out to the outside under the negative pressure, resulting in a decrease in the temperature in the inner tank and ultimately having an adverse effect on the food cooking effect.

[0082] Specifically, the two-position four-way solenoid valve itself is a solenoid valve, mainly composed of a valve body and a driving mechanism, and is a self-holding valve. After receiving the open (close) valve signal, the driving mechanism is powered to drive the ball valve core to rotate. After the core rotates in place, the electric actuator internally cuts off the power, the valve position mechanical indication points to the corresponding valve position, and the valve position switch outputs a passive valve position signal. Each time the core rotates 90°, the valve function switches once.

[0083] Further, in this embodiment, it further includes:

[0084] A drain valve assembly 4, which is provided with a water inlet, and the water inlet is arranged at the bottom wall position of the inner tank 1, and the condensed water flowing through the bottom wall of the inner tank 1 is adapted to enter the inside of the drain valve assembly 4 through the water inlet;

[0085] Such as Figure 1 and Figure 2 shown, the water inlet of the drain valve assembly 4 is arranged on the upper side of the drain valve assembly 4, and the water inlet itself is communicated with the bottom wall of the inner tank 1. Specifically, the bottom wall of the inner tank 1 itself has a certain slope, and the water inlet is arranged at the lowest position of the bottom wall of the inner tank 1, so as to ensure that all the condensed water on the bottom wall of the inner tank 1 can flow into the water inlet position.

[0086] In this embodiment, the structure of the drain valve assembly 4 itself is not limited, as long as it can form a conduction when drawing a negative pressure to allow the condensed water to pass through. As an implementation manner, the drain valve assembly 4 is set as a check valve. Preferably, as Figure 4 shown, the drain valve assembly 4 includes:

[0087] A base 41, which is internally provided with a receiving cavity, and the upper part of the top cover 44 is arranged in a hexagonal joint shape, so as to facilitate the disassembly work;

[0088] An elastic member, one end of which is disposed in the base 41;

[0089] A sliding cover 43, disposed at the other end of the elastic member and movable in the receiving cavity under the drive of the elastic member;

[0090] The setting manner of the elastic member is not limited, as long as it can improve the elastic support force of the sliding cover 43. Preferably, the elastic member is set as a spring 42.

[0091] In this embodiment, in order to improve the connection stability between the elastic member and the base 41, a spring seat 45 is further included, which is disposed in the receiving cavity, and a water-permeable part is provided on the spring seat 45;

[0092] By providing the water-permeable part, the condensed water entering the drainage valve assembly 4 can smoothly pass through the spring seat 45 and then further flow out of the base 41.

[0093] Specifically, the spring seat 45 itself can be fixed inside the base 41 or detachably disposed in the base 41. Further, a plurality of buckles 451 are provided on the spring seat 45, and the buckles 451 themselves can be used for assembling with the spring 42, thereby improving the assembly stability of the bottom of the spring 42.

[0094] A top cover 44, pressed on the sliding cover 43 and connected to the base 41.

[0095] Specifically, the top end of the spring 42 abuts against the inner wall of the sliding cover 43, and the top surface of the sliding cover 43 is a closed structure. Only when a certain gap appears between the sliding cover 43 and the inner wall of the top cover 44, the condensed water will enter the base 41 through this gap.

[0096] Such as Figure 4 As shown, by providing the spring 42, an upward pressure can be given to the sliding cover 43, and this pressure can further abut against the sliding cover 43, so that the sliding cover 43 is in sealed contact with the top cover 44. In this embodiment, a fillet is provided on the top surface of the sliding cover 43, which helps to improve the sealing performance between the sliding cover 43 and the inner wall of the top cover 44.

[0097] Further, a sealing ring 49 is provided at a position on the inner wall of the top cover 44 corresponding to the sliding cover 43, and the sliding cover 43 is adapted to move relative to the sealing ring 49 under the action of the waste water pump 7 and the elastic member. Specifically, the sealing ring 49 itself is annularly arranged, a groove is provided on the inner wall of the top cover 44, and the sealing ring 49 itself is arranged in the groove. By providing the sealing ring 49, the sealing effect between the sliding cover 43 and the top cover 44 can be improved.

[0098] A hollowed-out part is provided in the middle of the top cover 44. A filter screen cover 46 is provided in the hollowed-out part, and a filter screen 47 is provided on the filter screen cover 46. By providing the filter screen, blocky sundries in the condensed water, such as food residues, etc., will not enter the drain valve assembly 4, thereby further preventing the connecting pipe from being blocked. At the same time, the filter screen helps to ensure the smoothness of the connecting pipe, thereby further ensuring the smoothness and stability during the pumping operation of the drain valve assembly 4.

[0099] Further, the filter screen cover 46 includes a support frame. The filter screen is provided on the support frame, and a handle 48 is provided on the top surface of the support frame. By providing the handle 48, it is convenient to remove the filter screen cover 46 to achieve rapid cleaning of food residues, etc.

[0100] In this embodiment, when the waste water pump 7 is started, a negative pressure is generated in the connecting pipe, and the negative pressure gradually increases, causing the spring 42 to compress and the sliding cover 43 to move downward, creating a gap with the sealing ring 49. The waste water or condensed water flows out through this gap, then further flows into the connecting pipe, and flows out through the connecting pipe to the waste water tank or directly into the sewer.

[0101] In this embodiment, the top cover 44 is provided with an external thread, and the inner wall of the base 41 is correspondingly provided with a thread 411. Threads are correspondingly provided between the filter screen cover 46 and the inner wall of the top cover 44 to achieve stable connection. At the same time, a flange is provided on the top cover 44, and a sealing gasket 14 is provided at the bottom of the flange. The sealing gasket 14 itself contacts the top of the base 41, thereby improving the sealing effect between the top cover 44 and the base 41.

[0102] Further, a water level probe is provided on the sliding cover 43, and the water level probe is communicatively connected to the waste water pump 7. During the cooking process, the formed condensed water or the oil-water mixture will gradually gather at the top of the sliding cover 43 for storage. When the water level exceeds a certain level, the water level probe will send a signal to the waste water pump 7 at this time, and the waste water pump 7 will start and perform a vacuum pumping operation on the drain valve assembly 4 to achieve automatic drainage.

[0103] The working process of the steam cooking device provided in this embodiment is generally as follows:

[0104] The steam generator 2 is started, and the generated steam is injected into the inner pot 1 through the steam pipe 3. When the steam cooking device itself completes the cooking operation, the door lock on the door body will be locked first to prevent the user from opening the door hurriedly, causing thermal burns to the user by the high-temperature steam. It is not until the inner pot cools naturally to the preset temperature that the door lock opens by itself.

[0105] When an opening action is detected on the door body while the inner container temperature is higher than the preset temperature, the exhaust pump is controlled to start. At this time, the high-temperature steam will sequentially pass through the exhaust valve assembly and the air guide pipe and be discharged to the outside, thereby achieving the purpose of quickly cooling the inner container.

[0106] Meanwhile, during the cooking process, the high-temperature steam forms condensed water after heat exchange with the inner container 1. The condensed water continuously gathers on the bottom wall of the inner container 1 and flows into the upper part of the sliding cover 43 through the water inlet of the drain valve assembly 4 and continuously accumulates on the sliding cover 43.

[0107] The water level probe monitors the water level of the condensed water on the sliding cover 43 in real time. When the preset time has passed or the water level exceeds a certain height, the water level probe sends a signal to the waste water pump 7, and the waste water pump 7 starts. As Figure 5 shown, the negative pressure generated by the waste water pump 7 will drive the sliding cover 43 in the drain valve assembly 4 to move downward. At this time, a gap will be formed between the sliding cover 43 and the top cover 44, and the condensed water will enter the base 41 through the gap and, under the action of the waste water pump 7, pass through the exhaust pipe and the waste water pipe and be discharged to the outside.

[0108] Embodiment 2

[0109] This embodiment provides a control method for a steam cooking device, including an inner container. The inner container is connected to an exhaust pump, and a door lock is provided on the door body of the inner container. The method includes the following steps:

[0110] S1. Obtain the cooking completion signal of the food to be cooked;

[0111] In this embodiment, the cooking completion signal can be determined by setting the cooking duration. For example, starting from the start of the steam cooking device, after 20 minutes, it is defaulted that the food has been cooked, and at this time, the cooking completion signal is sent.

[0112] S2. Obtain the opening signal of the door body;

[0113] There is no limitation on the method of obtaining the opening signal of the door body. As an implementation method, a pressure sensor can be set on the doorknob of the door body, and the opening action of the user can be judged through the pressure sensor. As another implementation method, an infrared sensor can also be set on the doorknob. When it detects that a person is approaching, the signal is recognized as the opening signal.

[0114] S3. Obtain the temperature of the inner container;

[0115] After the cooking action is completed, since the inner container is filled with high-temperature steam, the temperature of the inner container will inevitably increase. At this time, if the door body is opened rashly, it may cause thermal burns to the user by the high-temperature steam.

[0116] S4. When the temperature of the inner container is higher than the preset temperature value, control the exhaust pump to start;

[0117] Since the user directly opening the door body at this time will cause thermal burns to themselves, the controller will directly control the exhaust pump to start. By starting the exhaust pump, the high-temperature steam in the inner container can be discharged, thus playing a role in cooling. At the same time, the waste water pump can also be controlled to start. At this time, the condensed water in the inner container can be discharged, which helps to reduce the density of the high-temperature steam in the inner container, and further plays a role in cooling.

[0118] Furthermore, when the door body is opened, since the inner container is in a negative pressure state, the low-temperature air outside will quickly replenish into the inner container to cool the inner container. At the same time, due to the existence of negative pressure, the high-temperature steam will not rush towards the user, thereby avoiding thermal burns to the user.

[0119] In this embodiment, the preset temperature value is set to 80 °C, and the user or producer can adjust the set temperature value according to the actual situation.

[0120] In this step, it also includes: controlling the door lock to lock; when the temperature is higher than the set temperature value, the door lock locks, and at this time the door body will no longer open. At the same time, it cooperates with the start of the exhaust pump, so as to ensure that the high-temperature steam will not scald the user while quickly cooling the inner container.

[0121] In this embodiment, it also includes the following steps: when the temperature of the inner container is lower than the preset temperature value, control the exhaust pump to stop and at the same time control the door lock to unlock. At this time, the user can freely open the door body. Since the temperature of the inner container has decreased, the high-temperature steam will not cause thermal burns to the user.

[0122] Obviously, the above embodiments are only examples clearly described and 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 list 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 steam cooking device, characterized in that, Comprising: Inner liner (1) with a cooking cavity adapted for placing food provided therein; Steam generator (2) adapted to generate steam, a steam pipe (3) being connected to the steam generator (2), and one end of the steam pipe (3) acting in the cooking cavity; Air intake pipe, one end of which acts in the inner liner; Exhaust pump acting on the air intake pipe and adapted to form a negative pressure inside the air intake pipe; The air intake pipe includes: a first air intake pipe, one end of which is connected to the inner liner and the other end of which is connected to the exhaust pump; It further includes: Waste water pipe (9), one end of which is connected to the steam generator (2); Waste water pump (7) connected to the other end of the waste water pipe (9); The waste water pipe includes a first waste water pipe and a second waste water pipe, one end of the second waste water pipe being connected to the waste water pump, the first air intake pipe includes a second air intake pipe and a third air intake pipe, and one end of the third air intake pipe is connected to the exhaust pump; The steam cooking device further includes: Two-position four-way solenoid valve (10), two inlet ends of the two-position four-way solenoid valve (10) being connected to the first waste water pipe and the second air intake pipe, and two outlet ends of the two-position four-way solenoid valve (10) being respectively connected to the second waste water pipe and the third air intake pipe; Drain valve assembly (4) having a water inlet provided at the bottom wall position of the inner liner (1), and the condensed water flowing through the bottom wall of the inner liner (1) is adapted to enter the inside of the drain valve assembly (4) through the water inlet, and the first air intake pipe is communicated with the drain valve assembly (4).

2. The steam cooking device according to claim 1, characterized in that, The air intake pipe further includes: Exhaust gas discharge pipe, one end of which is connected to the exhaust pump and the other end of which extends out of the outside of the inner liner.

3. The steam cooking device according to claim 2, characterized in that, It further includes: Waste water outlet pipe provided on the waste water pump for leading the waste water to the outside.

4. The steam cooking device according to claim 1, wherein The drain valve assembly (4) includes: Base (41) with a receiving cavity provided therein; Elastic member, one end of which abuts against the receiving cavity; Sliding cover (43) provided at the other end of the elastic member and movable in the receiving cavity under the drive of the elastic member; Top cover (44) pressed on the sliding cover (43) and connected to the base (41).

5. The steam cooking device according to claim 4, characterized in that, It further includes: Spring seat (45) provided in the receiving cavity, the spring seat (45) being provided with a water permeable portion, and the elastic member is mounted on the spring seat (45).

6. The steam cooking device according to claim 5, wherein, A hollow portion is provided in the middle of the top cover (44), a filter screen cover (46) is provided in the hollow portion, and a filter screen is provided on the filter screen cover (46).

7. The steam cooking device according to claim 6, characterized in that, The filter screen cover (46) includes a support frame, the filter screen is provided on the support frame, and a handle (48) is provided on the top surface of the support frame.

8. The steam cooking device according to claim 4, wherein, A sealing ring (49) is provided at a position on the inner wall of the top cover (44) corresponding to the sliding cover (43), and the sliding cover (43) is adapted to move relative to the sealing ring (49) under the action of the waste water pump (7) and the elastic member.

9. The steam cooking device according to claim 4, characterized in that, A water level probe is provided on the sliding cover (43), and the water level probe is in communication connection with the waste water pump (7).

10. The steam cooking device according to claim 1, characterized in that, A door body is provided on the inner liner (1), a door lock is provided on the door body, and it further includes: A temperature sensor, adapted to detect the temperature inside the inner container, and the temperature sensor is communicatively connected to the exhaust pump and the door lock.

11. The steam cooking device according to claim 1, characterized in that, The steam cooking device is a steam oven.

12. A control method for a steam cooking device, used to control the steam cooking device as described in claim 1, the steam cooking device comprising an inner container, a door body provided on the inner container, and an exhaust pump communicated with the inner container, characterized in that, It includes the following steps: Obtain a cooking completion signal of the food to be cooked; Obtain an opening signal of the door body; Obtain the temperature of the inner container; When the temperature of the inner container is higher than a preset temperature value, control the exhaust pump to start.

13. The control method of the steam cooking device according to claim 12, wherein a door lock is provided on the door body of the inner container, and characterized in that, In the step of controlling the exhaust pump to start when the temperature of the inner container is higher than the preset temperature value, it further includes: controlling the door lock to lock.

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