Oven steaming and baking system and steaming and drying baking method thereof

Abstract

The present invention discloses an oven steaming and baking system and a steaming and baking and dry baking method thereof, which are used to solve the technical problem that a marine cooking oven can simultaneously take into account steaming and baking and dry baking; the system comprises an oven steaming and baking body, a controller, and also includes: an electric hot air system and a steam generator system; the present invention provides an oven steaming and baking system, which can perform various types of automatic processing such as baking, frying, roasting, steaming, stewing, scalding, and boiling on poultry, fish, meat, vegetables, rice, and noodle foods; wherein, by respectively adjusting the working rhythm and output power of the electric hot air system and the steam generator system, at least five working modes of dry baking, steaming, high-temperature steaming, low-temperature steaming, and rewarming can be realized; heat energy is transferred by generating hot air convection and steam convection by the electric hot air system and the steam generator system.

Description

Technical Field

[0001] The present invention relates to the technical field of automatic steaming and baking, and in particular to an oven steaming and baking system and a steaming and baking and dry baking method thereof. Background Art

[0002] The ovens and steamers in the prior art usually have a single function and can only meet the needs of baking or steaming. Authorization announcement number CN209733430U discloses a steam-bake combination machine, which uses a heat insulation device to separate the cooking space into a steamer cavity and an oven cavity, and simply combines steaming and baking together, which cannot meet the cooking needs of combining steaming and baking. The electromagnetic steam oven disclosed in publication number CN110799074A also has the same usage problem. With the further improvement of existing cooking technology, some ingredients will lose a lot of water if they are simply baked during the production process, and thus lose their original soft and tender taste; further, if baking is abandoned and steamed instead, although the soft and tender taste can be retained, the crispness that baking can bring is missing. In addition, studies have shown that when ingredients are baked in different humidity environments, the fragrance produced after the denaturation of the ingredients will form obvious differences, resulting in different taste experiences for food obtained under different cooking parameters. If the above cooking methods can be applied to various types of automated processing such as baking, frying, roasting, steaming, braising, blanching and boiling of poultry, fish, meat, vegetables, rice and noodles, the taste and texture of the food can be further improved.

[0003] Therefore, providing an oven steaming and baking system and a method for steaming and baking and dry baking, so that the same set of hardware facilities can simultaneously meet the use requirements of five different working modes: dry baking, steaming, high-temperature steaming, low-temperature steaming and reheating, has become an urgent problem to be solved by technical personnel in this field. Summary of the Invention

[0004] The main purpose of the present invention is to provide an oven steaming and baking system and its steaming and baking and dry baking methods, which are used to solve the technical problem that a marine cooking oven can simultaneously take into account steaming and baking.

[0005] In order to achieve the above-mentioned objectives, on the one hand, the present invention provides an oven steaming and baking system, comprising a steaming and baking oven body, a controller, and also comprising: an electric hot air system and a steam generator system; the electric hot air system comprises: a fan, an air duct and a heat exchanger; the steam generator system comprises: a spray nozzle and a water supply pipeline provided with a pipe valve; the water supply pipeline is connected to the spray nozzle; the spray nozzle of the steam generator system is arranged facing the air inlet side and / or air outlet side of the fan blade of the fan; the air inlet side and / or air outlet side of the fan blade is provided with a heat exchanger; the air outlet side of the fan blade is connected to the inner cavity of the steaming and baking oven body through the air duct; when the heat exchanger is located on the air outlet side, the heat exchanger is located in the air duct; a steam recovery device is provided at the bottom of the steaming and baking oven body, and the steam recovery device causes an opening portion to be connected to the steaming and baking oven body; the input ends of the control circuits of the electric hot air system and the steam generator system are respectively electrically connected to the controller.

[0006] Preferably, the heat exchanger is an electric heater; the structure of the electric hot air system includes: a fan provided with the fan blades and the electric heater and a first temperature sensor; the first temperature sensor is used to collect the temperature of the air outlet of the fan; the fan, the electric heater and the first temperature sensor are electrically connected to the controller respectively; the components used for heating by the electric heater are evenly arranged around the fan blades.

[0007] Preferably, there are two electric heaters, namely a first electric heater and a second electric heater; the heating components of the first electric heater are evenly arranged around the fan blades; the heating components of the second electric heater are arranged on the air outlet side of the fan blades.

[0008] Preferably, the steam generator system is provided with a water mist distributor; the steam nozzle is a direct spray nozzle; and the output end of the direct spray nozzle is connected to the water mist distributor.

[0009] Preferably, the structure of the steam recovery device includes: a steam recovery chamber and a condensed water recovery chamber; the upper end surface of the steam recovery chamber is provided with a first grid communication port connected to the chamber for setting the electric hot air system and the steam generator system, and a second grid communication port for communicating with the lower end surface of the steam oven body; the steam recovery chamber is provided with a nozzle interface, and the nozzle interface is connected to the condensed water pump and the exhaust pump respectively through a two-position three-way valve, and the two-position three-way valve is used to switch the condensed water pump or the exhaust pump to be connected to the nozzle interface separately; ... The lower end surface of the collecting chamber is connected with the condensate recovery chamber through a pipe; the lower end of the condensate recovery chamber is provided with a liquid discharge port; the upper end of the condensate recovery chamber is provided with an overflow channel; a condenser nozzle is provided in the condensate recovery chamber; the condenser nozzle is connected with the condenser water supply pipe through a pipe and a valve; the condensate recovery chamber is provided with a bypass pipe connected to the steam outlet part of the steam generating system, and a second temperature sensor is provided at one end of the bypass pipe located in the condensate recovery chamber; the second temperature sensor is electrically connected to the controller.

[0010] Preferably, a liquid level sensor is provided in the condensed water recovery chamber; the liquid level sensor is electrically connected to the controller.

[0011] Preferably, a third temperature sensor is provided in the condensed water recovery chamber; the third temperature sensor is electrically connected to the controller.

[0012] On the other hand, in order to better apply the above oven steaming and baking system, the present invention also provides a steaming and baking method of the oven steaming and baking system, the method comprising the following steps:

[0013] Step 1: Using a first temperature sensor to collect the temperature inside the steam oven, determine whether to turn on the electric heater; when the temperature inside the steam oven is lower than the set temperature, the controller controls the electric heater to start working;

[0014] Step 2: heating the electric hot air system by the electric heater until the outer surface temperature of the electric heater satisfies the requirement that the surface water can be completely evaporated within 1 second when sprayed with pure water;

[0015] Step 3: spraying pure water through a spray nozzle toward the fan blades of the electric hot air system, so that the pure water is evenly sprinkled onto the outer surface of the electric heater under the action of the fan blades;

[0016] Step 4: The second temperature sensor continuously collects the temperature of the steam output port of the steam generator system to determine whether the steam output is saturated; when the collected temperature is lower than the set temperature, the controller controls the electric hot air system and the steam generator system to cooperate to continue to output high-temperature steam until the second temperature sensor reaches the set temperature and stops working;

[0017] Step 5: The steam recovery device simultaneously recovers the water vapor located in the steam oven body.

[0018] Preferably, when a high-temperature steaming operation is required, the set temperature of the second temperature sensor is 100 degrees Celsius; when a temperature recovery operation is required, the electric hot air system and the steam generator system operate alternately.

[0019] In addition, the present invention further provides a dry baking method of an oven steaming and baking system, the method comprising the following steps:

[0020] Step 1: Using a first temperature sensor to collect the temperature inside the steam oven, determine whether to turn on the electric heater; when the temperature inside the steam oven is lower than the set temperature, the controller controls the electric heater to start working;

[0021] Step 2: heating the electric hot air system by an electric heater until the outer surface temperature of the electric heater meets the heating set temperature required for dry baking; the heating set temperature is the temperature at the air outlet of the fan collected by the first temperature sensor;

[0022] Step 3: Adjust the dry baking mode by adjusting the intermittent operation time of the fan;

[0023] Step 4: If the temperature information fed back by the second temperature sensor set at one end of the bypass pipe in the condensate recovery chamber is higher than the set temperature, the controller controls the nozzle interface set in the steam recovery chamber to connect with the vacuum pump through the two-position three-way valve to perform the vacuum operation and adjust the temperature inside the steam oven body.

[0024] The present invention provides an oven steaming and baking system, which can perform various types of automatic processing such as baking, frying, roasting, steaming, stewing, blanching, and boiling on poultry, fish, meat, vegetables, rice, and pasta; wherein, by respectively adjusting the working rhythm and output power of the electric hot air system and the steam generator system, at least five working modes of dry baking, steaming, high-temperature steaming, low-temperature steaming, and rewarming can be realized; heat energy is transferred by generating hot air convection and steam convection through the electric hot air system and the steam generator system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of the oven steaming and baking system in Example 1 of the present invention;

[0026] Figure 2 Schematic diagram of the structure of the heat exchanger in Example 1 of the present invention;

[0027] Figure 3 Schematic diagram of the structure of the steam recovery device in Example 2 of the present invention;

[0028] Figure 4 for Figure 3 Schematic diagram of the pipe connection structure of the middle nozzle interface;

[0029] Figure 5 This is a schematic diagram of the control principle in Example 4 of the present invention. Specific embodiments

[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention. Since the elderly-assisting robot targeted by the following control method of the present invention is a home care robot with a control chip and a robotic arm in the prior art, the specific structural information related to the elderly-assisting robot will not be further illustrated or described herein.

[0031] Example 1:

[0032] like Figure 1 As shown, the present application provides an oven steaming and baking system, comprising an oven steaming and baking body 100, a controller 200, and further comprising: an electric hot air system 300 and a steam generator system 400;

[0033] The electric hot air system 300 includes: a fan 310, an air duct 320 and a heat exchanger 330;

[0034] The steam generator system 400 includes: a spray nozzle 410 and a water supply pipeline 420 provided with a pipe valve; the water supply pipeline 420 is connected to the spray nozzle 410;

[0035] The spray nozzles of the steam generator system are arranged facing the air inlet side and / or the air outlet side of the fan blades of the fan 310; a heat exchanger 330 is arranged on the air inlet side and / or the air outlet side of the fan blades; the air outlet side of the fan blades is connected to the inner cavity of the steam oven body 100 through the air duct 320; when the heat exchanger 330 is located on the air outlet side, the heat exchanger 330 is located in the air duct;

[0036] The bottom of the steam oven 100 is provided with a steam recovery device 500, and the steam recovery device 500 enables an opening 510 to communicate with the steam oven body;

[0037] The input ends of the control circuits of the electric hot air system 300 and the steam generator system 400 are electrically connected to the controller 200 respectively.

[0038] In one preferred technical solution of this embodiment, a fourth temperature sensor is installed within the cavity of the steam oven body 100. This fourth temperature sensor is electrically connected to the controller and is used to detect the cooking temperature within the steam oven body. It should be noted that since this temperature sensing structure is installed in the cabinet of existing ovens, the related technology is prior art and a conventional structural arrangement in the field. Therefore, the relevant technical details are not further elaborated here.

[0039] like Figure 1 As shown, in one of the preferred technical solutions of this embodiment, the heat exchanger 330 is an electric heater; the structure of the electric hot air system includes: a fan 310 provided with the fan blades and the electric heater 330 and a first temperature sensor 340; the first temperature sensor 340 is used to collect the temperature of the air outlet of the fan 310; the fan 310, the electric heater 330 and the first temperature sensor 340 are electrically connected to the controller 200 respectively; the components used for heating by the electric heater 330 are evenly arranged around the fan blades.

[0040] It should be noted that due to Figure 1 The structural diagram in the figure cannot fully illustrate the detailed structure of the relevant air duct under the cross-sectional structure. Figure 1 The setting position of the first temperature sensor 340 is only for illustration, not its actual setting position; in addition, the structural design of the relevant air duct is based on the air duct structure in the prior art, so the relevant structural details are not further illustrated in this application.

[0041] like Figure 2 As shown, in one preferred technical solution of this embodiment, two electric heaters 330 are provided: a first electric heater and a second electric heater. The heating components of the first electric heater are evenly arranged around the fan blades, while the heating components of the second electric heater are arranged on the air outlet side of the fan blades. This structural arrangement can improve heat exchange efficiency.

[0042] like Figure 1 As shown, in one preferred technical solution of this embodiment, the steam generator system 400 is equipped with a water mist distributor 430; the steam nozzle 410 is a direct-spray nozzle; the output end of the direct-spray nozzle is connected to the water mist distributor 430. The water mist distributor is configured to form a water mist that can be evenly sprayed onto the blades, allowing the ejected water droplets to evenly fall on the heat exchanger to quickly generate high-temperature steam, thereby helping to improve steam generation efficiency. It should be noted that the structure of the water mist distributor is based on existing technology and can preferably refer to the structural design of existing shower heads. Therefore, its detailed structure is not further illustrated or described here.

[0043] Example 2:

[0044] like Figure 3 As shown, this embodiment further provides a steam recovery device 500 on the basis of embodiment 1, and the structure of the steam recovery device 500 includes: a steam recovery chamber 510 and a condensate recovery chamber 520; the upper end surface of the steam recovery chamber 510 is provided with a first grid communication port 511 connected to the chamber for setting the electric hot air system and the steam generator system, and a second grid communication port 512 for communicating with the lower end surface of the steam oven body; the steam recovery chamber 510 is provided with a nozzle interface 513, and the nozzle interface 513 is connected to the condensate pump L and the air extraction pump C respectively through a two-position three-way valve F, and the two-position three-way valve is used to switch the condensate pump L or the air extraction pump C to be separately connected to the nozzle interface (for specific pipeline connections, see Figure 4 as shown); the lower end face of the steam recovery chamber 510 is connected with the condensate recovery chamber 520 through a pipe; the lower end of the condensate recovery chamber 520 is provided with a liquid discharge port 521; the upper end of the condensate recovery chamber 520 is provided with an overflow channel 522; a condenser nozzle 523 is provided in the condensate recovery chamber 520; the condenser nozzle 523 is connected with the condenser water supply pipe Y1 through a pipe and a valve; the condensate recovery chamber 520 is provided with a bypass pipe 524 connected to the steam outlet part K1 of the steam generating system, and the bypass pipe 524 is provided with a second temperature sensor 530 at one end located in the condensate recovery chamber; the second temperature sensor 530 is electrically connected to the controller.

[0045] It should be noted that the structures of the above-mentioned first grid communication opening 511 and the second grid communication opening 512 are both realized by setting a metal mesh at the opening connection part, and their structural settings are similar to the appearance of the metal filter mesh, so the relevant structural details will not be further described or illustrated here.

[0046] like Figure 3 As shown, in one preferred technical solution of this embodiment, a liquid level sensor 540 is provided in the condensate recovery chamber 520; the liquid level sensor 540 is electrically connected to the controller. The provision of the liquid level sensor can promptly detect whether drainage blockage occurs in the condensate recovery chamber 520.

[0047] like Figure 3 As shown, in one of the preferred technical solutions of this embodiment, a third temperature sensor 550 is provided in the condensed water recovery chamber 520; the third temperature sensor 550 is electrically connected to the controller.

[0048] like Figure 3As shown, in one of the preferred technical solutions of this embodiment, the steam recovery chamber 510 is provided with a water retaining and drainage plate DS at the second grid communication port 512; the condensed water recovery chamber 520 is provided with a water retaining plate DB at the water inlet.

[0049] Example 2:

[0050] The present invention further provides a steaming and baking method of an oven steaming and baking system based on Example 1, characterized in that the method comprises the following steps:

[0051] Step 1: Using a first temperature sensor to collect the temperature inside the steam oven, determine whether to turn on the electric heater; when the temperature inside the steam oven is lower than the set temperature, the controller controls the electric heater to start working;

[0052] Step 2: heating the electric hot air system by an electric heater until the outer surface temperature of the electric heater satisfies the requirement that the surface water can be completely evaporated within 1 second when sprayed with pure water;

[0053] Step 3: spraying pure water through a spray nozzle toward the fan blades of the electric hot air system, so that the pure water is evenly sprinkled onto the outer surface of the electric heater under the action of the fan blades;

[0054] Step 4: The second temperature sensor continuously collects the temperature of the steam output port of the steam generator system to determine whether the steam output is saturated; when the collected temperature is lower than the set temperature, the controller controls the electric hot air system and the steam generator system to cooperate to continue to output high-temperature steam until the second temperature sensor reaches the set temperature and stops working;

[0055] Step 5: The steam recovery device simultaneously recovers the water vapor located in the steam oven body.

[0056] Preferably, in one of the preferred technical solutions of this embodiment, when high-temperature steaming operation is required, the set temperature of the second temperature sensor is 100 degrees Celsius; when reheating operation is required, the electric hot air system and the steam generator system operate alternately.

[0057] In addition, this embodiment further provides a dry baking method of an oven steaming and baking system, characterized in that the method comprises the following steps:

[0058] Step 1: Using a first temperature sensor to collect the temperature inside the steam oven, determine whether to turn on the electric heater; when the temperature inside the steam oven is lower than the set temperature, the controller controls the electric heater to start working;

[0059] Step 2: Heating the electric hot air system with an electric heater until the outer surface temperature of the convection oven heater and / or the convection oven heat exchanger meets the set heating temperature required for dry baking; the set heating temperature is the temperature at the air outlet of the fan measured by the first temperature sensor;

[0060] Step 3: Adjust the dry baking mode by adjusting the intermittent operation time of the fan;

[0061] Step 4: If the temperature information fed back by the second temperature sensor set at one end of the bypass pipe in the condensate recovery chamber is higher than the set temperature, the controller controls the nozzle interface set in the steam recovery chamber to connect with the vacuum pump through the two-position three-way valve to perform the vacuum operation and adjust the temperature inside the steam oven body.

[0062] Example 3:

[0063] This embodiment further provides the following food cooking modes based on embodiment 2:

[0064] 1. Steam fumigation: temperature range 100 degrees Celsius.

[0065] During steaming, the oven body is heated by an electric heater. Water is sprayed directly onto the blower impeller through a spray nozzle and a water mist distributor. The water is then thrown onto the hot heater by the centrifugal force of the fan impeller and evaporated. The electric heater's heating is controlled by a first temperature sensor. When the temperature inside the oven body drops below a set temperature, the heater / heat exchanger begins heating. Steam generation is controlled by a second temperature sensor. Water is sprayed onto the blower impeller through a direct water inlet solenoid valve until the second temperature sensor reaches the set temperature (steam saturation). Later in operation, when the temperature at the end of the bypass pipe (preferably using the second temperature sensor to sense the steam temperature) drops below the set temperature, the water injection (solenoid valve) is reopened. The blower motor is powered on in reverse, blowing out steam. The program automatically terminates after a set time or when the core temperature (fourth temperature sensor) reaches the set value.

[0066] 2. Low temperature steaming: temperature range is below 100 degrees Celsius.

[0067] When the steaming temperature is below 100℃, the steam oven body is heated by an electric heater. Water is sprayed directly onto the blower impeller through the direct spray nozzle and water mist distributor, and then thrown onto the hot heater by the centrifugal force of the blower impeller to evaporate.

[0068] The electric heater's activation is controlled by the first temperature sensor. When the oven's temperature drops below the set point, the heater / heat exchanger begins heating, and water begins to spray directly onto the blower impeller through the nozzle and water mist distributor. The water is then flung onto the hot heater by the centrifugal force of the blower impeller, where it evaporates. A solenoid valve controls the continued water spray until the temperature detected by the second temperature sensor reaches the set point. The blower motor reverses via a contactor, generating steam below 100°C. The program automatically stops when the set time or the core temperature (from the fourth temperature sensor) reaches the set point.

[0069] 3. High temperature steaming: temperature range is higher than 100 degrees Celsius.

[0070] High-temperature steaming is a hybrid cooking process. While the steam oven is heated by the electric heater, water is also injected to generate steam. When the steam reaches saturation, it is overheated by the electric heater. After selecting a high-temperature steaming cooking process, the convection oven heater is activated via a contactor electrically connected to the controller. To control the steam injection, a second temperature sensor is attached to the bypass pipe. The direct water inlet solenoid valve remains open until the temperature information obtained by the second temperature sensor reaches the set value. During this process, the blower motor operates via the contactor (in reverse direction).

[0071] When the steam oven program running time or the product center temperature (detected by the fourth temperature sensor) reaches the set value, the program will automatically stop running.

[0072] 4. Dry baking: temperature range 30-250 degrees Celsius.

[0073] In dry-baking mode, the oven body is heated solely by the electric heater. The heater / convection heat exchanger (a burner may also be used) is activated and deactivated by the first temperature sensor; the heater activates whenever the temperature drops below the set temperature. In this program, the blower motor operates intermittently within a set temperature range of 30-99°C, controlled by a contactor. The blower typically operates for 2 seconds, and the intermittent time can be adjusted from a default of 60 seconds to 240 seconds depending on the oven temperature. The program automatically stops when the set time or core temperature (fourth temperature sensor) reaches the set value. In dry-baking mode, the nozzle interface 513 can also be connected to the air pump and used.

[0074] Furthermore, the oven steaming and baking system of the present invention utilizes PWM pulse width modulation technology to maintain a relatively constant output power of the heating element under varying input operating voltage conditions. Furthermore, the temperature near the heating element is detected by the equipment's temperature sensor, and the CPU then controls the on / off switching of the IGBT high-power switching transistor to achieve temperature control of the heating element.

[0075] Example 4:

[0076] This embodiment further provides a method for controlling a control circuit of a steaming and baking system of an oven based on the third embodiment, the method comprising the following steps:

[0077] Step 1: Perform analog-to-digital conversion and sampling on the input voltage;

[0078] Step 2: Determine the PWM duty cycle according to different input voltages;

[0079] Step 3: Use a DC amplitude-voltage power supply to supply power. The three outputs of the DC amplitude-voltage power supply are controlled to be turned on in time-sharing mode to supply power to the electric heater in time-sharing mode.

[0080] Step 4: sampling the input signals of the three temperature sensors; the three temperature sensors are the first temperature sensor, the second temperature sensor and the fourth temperature sensor in the above embodiment.

[0081] Step 5: Detect external control switch signal;

[0082] Step 6: Enable the CPU WATCH DOG function.

[0083] Its related control principles are as follows Figure 5 shown.

[0084] Preferred:

[0085] (1) In order to improve the design parameter margin of the main power switching device, the GT40T101 type IGBT tube is used. The tube has a withstand voltage of up to 1500V, a maximum current of 40A, and a switching time of less than 10us (the actual operating voltage is less than 650V and the operating current is less than 15A).

[0086] (2) In order to reduce the current fluctuation of the DC input line, the power output is divided into three groups working alternately (with a phase difference of 120°).

[0087] (3) In order to improve the insulation safety of electrical appliances, high isolation voltage, optocouplers and DC / DC isolation converters are used. The optocoupler isolation voltage is 7500V and the DC / DC isolation voltage is 3750V.

[0088] (4) In order to improve the temperature tolerance of the temperature sensor, a thermocouple is used as the temperature sensor, and its maximum operating temperature is 800°C (the actual operating temperature is less than 400°C).

[0089] (5) In order to improve electromagnetic compatibility, an LC matching network is used at the power input to filter out broadband interference.

[0090] (6) In order to achieve good heat dissipation, the entire device is made of aluminum alloy material as a heat sink for the power tube.

[0091] (7) In order to adapt to the humid environment of the kitchen, the equipment casing and socket are watertight.

[0092] It should be noted that the control mode used to meet the working needs of this application is not limited to the control method disclosed in this embodiment. The control methods implemented based on the oven steaming and baking system of this application are all required to be protected by this application and fall within the scope of protection of this application.

[0093] The above embodiments are only preferred implementations of the present invention. Within the technical field of the present invention, any changes and improvements based on the technical solutions of the present invention should not be excluded from the protection scope of the present invention.

Claims

1. An oven steaming and baking system, comprising an oven steaming and baking body and a controller, characterized in that: Also includes: electric hot air system and steam generator system; The electric hot air system includes: a fan, an air duct and a heat exchanger; The steam generator system includes: a spray nozzle and a water supply pipeline provided with a pipe valve; the water supply pipeline is connected to the spray nozzle; The spray nozzle of the steam generator system is arranged facing the air inlet side and / or the air outlet side of the fan blade of the fan; the air inlet side and / or the air outlet side of the fan blade is provided with a heat exchanger; the air outlet side of the fan blade is connected to the inner cavity of the steam oven body through an air duct; when the heat exchanger is located on the air outlet side, the heat exchanger is located in the air duct; A steam recovery device is provided at the bottom of the steam oven body, and an opening of the steam recovery device is connected to the steam oven body; The input ends of the control circuits of the electric hot air system and the steam generator system are electrically connected to the controller respectively; The structure of the steam recovery device includes: and a tube connecting the discharging opening of the gas heating unit and the pump with a check valve in it at the pump end, and said tube having a check valve in it at the pump end, and said former tube which connects the gas heating unit to the gas heating unit; and said former tube which connects the gas heating unit to the gas heating unit. The steam generator system is provided with a water mist distributor.

2. The oven steaming and baking system according to claim 1, characterized in that: The heat exchanger is an electric heater; the structure of the electric hot air system includes: a blower provided with the fan blades and the electric heater and a first temperature sensor; The first temperature sensor is used to collect the temperature of the air outlet of the fan; the fan, the electric heater and the first temperature sensor are electrically connected to the controller respectively; the components used for heating by the electric heater are evenly arranged around the fan blades.

3. The oven steaming and baking system according to claim 2, characterized in that: There are two electric heaters, namely a first electric heater and a second electric heater; the heating components of the first electric heater are evenly arranged around the fan blades; the heating components of the second electric heater are arranged on the air outlet side of the fan blades.

4. The oven steaming and baking system according to claim 1, characterized in that: The spray nozzle is a direct spray nozzle; the output end of the direct spray nozzle is connected to the water mist distributor.

5. The oven steaming and baking system according to claim 1, characterized in that: A liquid level sensor is provided in the condensed water recovery chamber; the liquid level sensor is electrically connected to the controller.

6. The oven steaming and baking system according to claim 1, characterized in that: A third temperature sensor is provided in the condensed water recovery chamber; the third temperature sensor is electrically connected to the controller.

7. A steaming and baking method of the oven steaming and baking system according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: Step 1: Using a first temperature sensor to collect the temperature inside the steam oven, determine whether to turn on the electric heater; when the temperature inside the steam oven is lower than the set temperature, the controller controls the electric heater to start working; Step 2: heating the electric hot air system by the electric heater until the outer surface temperature of the electric heater satisfies the requirement that the surface water can be completely evaporated within 1 second when sprayed with pure water; Step 3: spraying pure water through a spray nozzle toward the fan blades of the electric hot air system, so that the pure water is evenly sprinkled onto the outer surface of the electric heater under the action of the fan blades; Step 4: The second temperature sensor continuously collects the temperature of the steam output port of the steam generator system to determine whether the steam output is saturated; when the collected temperature is lower than the set temperature, the controller controls the electric hot air system and the steam generator system to cooperate to continue to output high-temperature steam until the second temperature sensor reaches the set temperature and stops working; Step 5: The steam recovery device simultaneously recovers the water vapor located in the steam oven body.

8. The method according to claim 7, characterized in that When high-temperature steaming operation is required, the set temperature of the second temperature sensor is 100 degrees Celsius; when reheating operation is required, the electric hot air system and the steam generator system operate alternately.

9. A dry baking method of the oven steaming and baking system according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: Step 1: Using a first temperature sensor to collect the temperature inside the steam oven, determine whether to turn on the electric heater; when the temperature inside the steam oven is lower than the set temperature, the controller controls the electric heater to start working; Step 2: heating the electric hot air system by an electric heater until the outer surface temperature of the electric heater meets the heating setting temperature required for dry baking; Step 3: Adjust the dry baking mode by adjusting the intermittent operation time of the fan; Step 4: If the temperature information fed back by the second temperature sensor set at one end of the bypass pipe in the condensate recovery chamber is higher than the set temperature, the controller controls the nozzle interface set in the steam recovery chamber to connect with the vacuum pump through the two-position three-way valve to perform the vacuum operation and adjust the temperature inside the steam oven body.

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