Steaming oven

Abstract

The utility model provides a steaming oven. The steaming oven comprises a cooking chamber, a heating source, a driving device, two vertical lifting devices and a baking tray, the heating source is fixedly mounted on the top wall of the cooking chamber; the two vertical lifting devices each comprise a static sliding rail and a movable sliding rail, the two static sliding rails are fixedly installed on the two oppositely-arranged side walls in the cooking cavity respectively, the upper ends of the static sliding rails extend out of the top of the cooking cavity, and the movable sliding rails are slidably connected with the static sliding rails; the baking tray is located between the two movable sliding rails and detachably connected with the two movable sliding rails, the movable sliding rails are connected with the driving device, and the driving device is used for driving the two movable sliding rails to slide up and down along the corresponding static sliding rails so as to drive the baking tray to move up and down in the vertical direction, so that food placed in the baking tray is close to or away from the heating source. According to the scheme, the distance between food and a heat source can be adjusted by adjusting the vertical position of the baking tray, and therefore the requirement for higher cooking temperature exceeding the preset temperature range is met.

Description

Technical Field

[0001] This utility model relates to the field of steam oven technology, and in particular to a steam oven. Background Technology

[0002] Steam ovens, as common kitchen appliances, typically have a baking temperature range of 35-250℃ (this temperature is generally measured at the geometric center of the oven), which is sufficient for most cooking situations. Furthermore, for safety reasons, higher temperatures are not considered. However, some cooking methods require temperatures above 250℃, such as 280℃ or even exceeding 300℃ for the baking function, to achieve a crispy and well-colored crust. To achieve higher cooking temperatures, the common practice is to increase the number or power of the heating elements. However, this method has the following drawbacks: First, increasing the number or power of the heating elements can cause the overall power consumption of the appliance to exceed the power limits of household appliances. Second, achieving high-temperature cooking by increasing the number or power of the heating elements can lead to severe temperature rise in the steam oven, causing the outer surface temperature to exceed the standard and posing a risk of burns. Utility Model Content

[0003] This utility model provides a steam oven that uses a sliding rail to move a baking tray freely up and down, moving it closer to and away from the heating element to obtain the corresponding temperature, thereby achieving the need for higher cooking temperatures beyond the preset temperature range.

[0004] In a first aspect, this utility model provides a steam oven, which includes: a cooking chamber, a heating source, a driving device, two vertical lifting devices, and a baking tray; wherein, the heating source is fixedly installed on the top wall of the cooking chamber; each of the two vertical lifting devices includes a static slide rail and a movable slide rail, the two static slide rails are respectively fixedly installed on two opposite side walls inside the cooking chamber, the upper end of the static slide rail extends out of the top of the cooking chamber, and the movable slide rail is slidably connected to the static slide rail;

[0005] The baking tray is located between two movable slide rails and is detachably connected to the two slide rails, which are connected to the drive unit;

[0006] The drive unit is used to drive two moving slide rails to slide up and down along the corresponding stationary slide rails, thereby moving the baking pan up and down in the vertical direction, so that the food placed on the baking pan is closer to or further away from the heat source.

[0007] Furthermore, the drive device includes a power motor, a first transmission structure, and two second transmission structures connected in sequence. The power motor, the first transmission structure, and the second transmission structures are located on the outer side of the top wall of the cooking chamber, and the two second transmission structures are respectively connected to the corresponding moving slide rails.

[0008] Furthermore, the first transmission structure includes a first transmission shaft, a first bearing, and two third gears;

[0009] The first bearing is sleeved on the first drive shaft, and the first drive shaft is rotatably fixed to the outer side of the top wall of the cooking chamber via the first bearing.

[0010] Two third gears are fixed at both ends of the first transmission shaft and are connected to the corresponding second transmission structure.

[0011] The power motor is connected to the first drive shaft via a transmission gear to drive the first drive shaft to rotate.

[0012] Furthermore, each of the second transmission structures includes a fourth gear, a second transmission shaft, a second bearing, and a fifth gear;

[0013] The second bearing is sleeved on the second drive shaft, and the second drive shaft is rotatably fixed to the outer side surface of the side wall near the top wall via the second bearing.

[0014] Both the fourth and fifth gears are fixed on the second drive shaft. The fourth gear is connected to the corresponding third gear, and the fifth gear is connected to the corresponding moving slide rail.

[0015] Furthermore, the steam oven also includes shelves located inside the cooking chamber, which are fixedly connected to each movable slide rail and are also detachably fixedly connected to the baking tray.

[0016] Furthermore, the steam oven also includes: a first sensor, a first transparent window is provided on the top of the cooking chamber, the first sensor is fixedly installed directly above the first transparent window, and the first sensor is used to measure the first distance between the baking tray and the heating source in real time.

[0017] Furthermore, the steam oven also includes a temperature sensor, which is installed on the inner wall of the cooking chamber and is used to measure the temperature information inside the cooking chamber.

[0018] Furthermore, the steam oven also includes a control panel, which is installed on the top outer wall of the cooking chamber; the control panel is able to send a first signal command to the power motor based on the pre-acquired cooking temperature and the first distance between the heat source and the baking tray, so that the power motor drives the first transmission structure and each of the second transmission structures.

[0019] Furthermore, the steam oven also includes a sensor installed on the top inner wall of the cooking chamber, which is used to detect whether a human hand is present between the top of the cooking chamber and the baking tray.

[0020] Furthermore, the steam oven also includes a second sensor and a lead screw. A rectangular second transparent window is provided on the side wall of the cooking chamber. The lead screw is horizontally fixed on one side of the second transparent window. The second sensor is sleeved on the lead screw and can move horizontally along the lead screw. The second sensor is used to measure a second distance between the upper and lower surfaces of the food placed in the baking tray.

[0021] The present invention provides the following beneficial effects:

[0022] This utility model provides a steam oven, including a cooking chamber, a heating source, a drive device, two vertical lifting devices, and a baking tray. The heating source is fixedly installed on the top wall of the cooking chamber. Each of the two vertical lifting devices includes a stationary slide rail and a movable slide rail. The two stationary slide rails are respectively fixedly installed on two opposite side walls inside the cooking chamber, with the upper end of the stationary slide rail extending out of the top of the cooking chamber. The movable slide rail is slidably connected to the stationary slide rail. The baking tray is located between the two movable slide rails and is detachably connected to them. The movable slide rails are connected to the drive device, which drives the two movable slide rails to slide up and down along the corresponding stationary slide rails, thereby moving the baking tray vertically up and down, thus bringing the food placed on the baking tray closer to or away from the heating source. This solution allows adjustment of the distance between the food and the heat source by adjusting the vertical position of the baking tray, thereby achieving higher cooking temperatures beyond the preset temperature range.

[0023] Other features and advantages disclosed herein will be set forth in the following description, or some features and advantages may be inferred from the description or determined without doubt, or may be learned by practicing the above-described techniques of this disclosure.

[0024] To make the above-mentioned objects, features and advantages of this disclosure more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of a steam oven provided in an embodiment of the present utility model;

[0027] Figure 2 This is a schematic diagram of the structure of another steam oven provided in an embodiment of the present utility model;

[0028] Figure 3This is a schematic diagram of the structure of another steam oven provided in an embodiment of the present utility model;

[0029] Figure 4 This is a schematic diagram of the structure of another steam oven provided in an embodiment of the present utility model;

[0030] Figure 5 This is a schematic diagram of the structure of another steam oven provided in an embodiment of the present utility model;

[0031] Figure 6 This is a schematic diagram of the structure of another steam oven provided in an embodiment of the present utility model;

[0032] Figure 7 This is a schematic diagram of the structure of another steam oven provided in an embodiment of the present utility model;

[0033] Figure 8 This is a schematic diagram of the structure of another steam oven provided in an embodiment of the present utility model;

[0034] Figure 9 This is a schematic diagram of a food height testing process provided for an embodiment of the present invention.

[0035] icon:

[0036] 1-Cooking chamber; 2-Heating source; 3-Drive device; 31-Power motor; 311-Transmission gear; 32-First transmission structure; 321-First transmission shaft; 322-First bearing; 323-Third gear; 33-Second transmission structure; 331-Fourth gear; 332-Second transmission shaft; 333-Second bearing; 334-Fifth gear; 4-Vertical lifting device; 41-Static slide rail; 42-Moving slide rail; 5-Baking tray; 6-Shelf; 7-First sensor; 8-Control panel; 9-Temperature sensor; 10-Induction sensor; 11-Second sensor; 12-Lead screw. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0038] Steam ovens, as common kitchen appliances, typically have a baking temperature range of 35-250℃ (this temperature is generally measured at the geometric center of the oven), which is sufficient for most cooking situations. Furthermore, for safety reasons, higher temperatures are not considered. However, some cooking methods require temperatures above 250℃, such as 280℃ or even exceeding 300℃ for the baking function, to achieve a crispy and well-colored crust. To achieve these high-temperature cooking effects, the following methods can be used: increasing the number or power of the heating elements to obtain a more efficient heating effect, thus meeting the high-temperature cooking requirements of the steam oven. However, this method has the following drawbacks: First, increasing the number or power of the heating elements can cause the overall power consumption of the appliance to exceed the power limit of household appliances. Second, achieving high-temperature cooking by increasing the number or power of the heating elements may lead to severe temperature rise in the steam oven, causing the outer surface temperature to exceed the standard, resulting in a risk of burns.

[0039] Based on this, the steam oven provided in this embodiment of the utility model can effectively alleviate the above-mentioned problems.

[0040] To facilitate understanding of this embodiment, a steam oven disclosed in this utility model embodiment will first be described in detail.

[0041] In one possible implementation, this invention provides a steam oven. Figure 1 A schematic diagram of the structure of a steam oven is shown, such as... Figure 1 As shown, it includes a cooking chamber 1, a heating source 2, a driving device 3, two vertical lifting devices 4, and a baking pan 5; wherein, the heating source 2 is fixedly installed on the top wall of the cooking chamber 1; each of the two vertical lifting devices 4 includes a static slide rail 41 and a movable slide rail 42, the two static slide rails 41 are respectively fixedly installed on two opposite side walls inside the cooking chamber 1, the upper end of the static slide rail 41 extends out of the top of the cooking chamber 1, and the movable slide rail 42 is slidably connected to the static slide rail 41.

[0042] The baking tray 5 is located between two movable slide rails 42 and is detachably connected to the two movable slide rails 42. The movable slide rails 42 are connected to the drive device 3. The drive device 3 is used to drive the two movable slide rails 42 to slide up and down along the corresponding stationary slide rails 41, so as to drive the baking tray 5 to move up and down in the vertical direction, thereby making the food placed in the baking tray 5 closer to or away from the heat source 2.

[0043] In practical applications, the cooking chamber can be located inside the oven body; the heating source can be a heating element (the position of the heating element is fixed, usually located on the top inner wall of the cooking chamber of the oven).

[0044] The two opposing side walls inside the cooking chamber 1 can be understood as the left side wall and the right side wall (taking the door of the steam oven facing the user as a reference, the two side walls near the left and right ends of the door are the left side wall and the right side wall, respectively).

[0045] The aforementioned drive device can be installed on the outer side of the top wall of the cooking chamber and connected to the movable slide rails of the two vertical lifting devices.

[0046] The baking tray can generally be detachably connected to two sliding rails. For example, a shelf can be fixed between the two sliding rails to hold the baking tray, or rollers fixed on the two sliding rails can be connected to both ends of the baking tray respectively.

[0047] In the actual implementation process, when cooking food, the food is placed in the steam oven through a baking tray or other container. According to the cooking temperature, time, heating method and other working parameters set by the user, the power of the heating element can be automatically adjusted. When the food is not placed at the specified height corresponding to the cooking temperature set by the user, the automatic control drive device drives the two moving slide rails to slide up and down along the corresponding stationary slide rails to adjust the position of the baking tray and move it to the specified height. Then, the cooking is completed according to the cooking temperature set by the user to obtain the best cooking effect.

[0048] It should be noted that, initially, the upper ends of both movable slide rails extend beyond the top of the cooking chamber and connect to the drive unit. Since there is a certain height difference between the top and bottom of the cooking chamber, sufficient height is needed between the top of the oven body and the top of the cooking chamber to accommodate the portion of the movable slide rail extending upwards. Furthermore, to save space, the portion of the movable slide rail extending upwards can retract into the top of the oven body (similar to the design of retractable roller shutters in existing technology). This eliminates the need for sufficient height between the top of the oven body and the top of the cooking chamber, allowing for a reduction in the oven's overall size.

[0049] In existing technology, the heating element position of an oven is fixed, the distance between the food and the heat source is fixed, and the center temperature is 250 degrees Celsius. If the required cooking temperature of the food exceeds the upper limit of 250 degrees Celsius, it cannot be achieved, resulting in poor heating effect (in oven heating scenarios). In order to obtain higher cooking temperatures, the common practice is to increase the number of heating elements or the power of the heating elements; however, this causes the power of the whole machine to exceed the power limit of household appliances, and the surface temperature of the whole machine exceeds the standard, causing a risk of burns.

[0050] When the required cooking temperature for food exceeds the upper limit of 250 degrees, this application can adjust the position of the baking pan by using a movable vertical lifting device to bring the food closer to the heat source to obtain a temperature exceeding the upper limit. This allows for higher cooking temperature requirements without increasing the number of heating elements or power, achieving high-temperature cooking beyond the preset temperature range. At the same time, it can also achieve a baking effect, thus diversifying the cooking methods.

[0051] Specifically, moving food away from the heating element lowers the temperature, achieving a baking effect; moving food closer to the heating element raises the temperature, achieving a braising effect. Therefore, depending on the type of food and cooking needs, multiple cooking method combinations can be preset, such as baking and braising, and users can choose the corresponding cooking combination according to their preferences.

[0052] This utility model provides a steam oven, including a cooking chamber, a heating source, a drive device, two vertical lifting devices, and a baking tray. The heating source is fixedly installed on the top wall of the cooking chamber. Each of the two vertical lifting devices includes a stationary slide rail and a movable slide rail. The two stationary slide rails are respectively fixedly installed on two opposite side walls inside the cooking chamber, with the upper end of the stationary slide rail extending out of the top of the cooking chamber. The movable slide rail is slidably connected to the stationary slide rail. The baking tray is located between the two movable slide rails and is detachably connected to them. The movable slide rails are connected to the drive device, which drives the two movable slide rails to slide up and down along the corresponding stationary slide rails, thereby moving the baking tray vertically up and down, thus bringing the food placed on the baking tray closer to or away from the heating source. This solution allows adjustment of the distance between the food and the heat source by adjusting the vertical position of the baking tray, thereby achieving higher cooking temperatures beyond the preset temperature range.

[0053] Furthermore, in order to enable the steam oven to achieve better cooking results, in this embodiment of the invention, the aforementioned driving device is used to drive the movable slide rail to meet the requirements of the cooking temperature on the height of the baking pan.

[0054] For ease of understanding, Figure 1 On this basis, Figure 2 A schematic diagram of another type of steam oven is shown, and the driving method of the moving slide rail is described in detail.

[0055] Specifically, if Figure 2 As shown in the embodiment of this utility model, the driving device 3 includes a power motor 31, a first transmission structure 32 and two second transmission structures 33 connected in sequence. The power motor 31, the first transmission structure 32 and the second transmission structure 33 are located on the outer side of the top wall of the cooking chamber 1. The two second transmission structures 33 are respectively connected to the corresponding moving slide rail 42.

[0056] In actual use, the two second transmission structures are connected one-to-one with the two moving slide rails; after the power motor is powered on, it can drive the first transmission structure to drive, and then drive the two second transmission structures connected to the first transmission structure to drive. The two second transmission structures can drive the two moving slide rails to slide up and down along the corresponding stationary slide rails.

[0057] To facilitate understanding the structure of the drive unit, in Figure 2 On this basis, Figure 3 A schematic diagram of another type of steam oven is also shown, such as... Figure 3 As shown, the first transmission structure 32 includes a first transmission shaft 321, a first bearing 322, and two third gears 323. The first bearing 322 is sleeved on the first transmission shaft 321, and the first transmission shaft 321 is rotatably fixed to the outer side of the top wall of the cooking chamber 1 through the first bearing 322. The two third gears 323 are respectively fixed at both ends of the first transmission shaft 321 and are connected to the corresponding second transmission structure 33. The power motor 31 is connected to the first transmission shaft 321 through the transmission gear 311 to drive the first transmission shaft 321 to rotate.

[0058] Further, such as Figure 3 As shown, both second transmission structures 33 include a fourth gear 331, a second transmission shaft 332, a second bearing 333, and a fifth gear 334. The second bearing 333 is sleeved on the second transmission shaft 332, and the second transmission shaft 332 is rotatably fixed to the outer side surface of the side wall near the top wall via the second bearing 333. The fourth gear 331 and the fifth gear 334 are both fixed on the second transmission shaft 332. The fourth gear 331 is connected to the corresponding third gear 323 in a transmission connection. The fifth gear 334 is connected to the corresponding movable slide rail 42 in a transmission connection.

[0059] In practical use, a power motor generally consists of a motor and gears connected in sequence. The first transmission structure generally consists of a main gear (equivalent to the aforementioned transmission gear), two bevel gears (equivalent to the aforementioned third gear), a transmission shaft (equivalent to the aforementioned first transmission shaft), and a first bearing. The two bevel gears are respectively fixed at both ends of the first transmission shaft, and the main gear is located between the two bevel gears and fixed on the first transmission shaft. The first bearing is sleeved on the first transmission shaft and fixed to the outer side of the top wall of the cooking chamber. In actual implementation, the gear of the power motor is connected to the main gear of the first transmission structure, and the first transmission shaft is rotatably connected to the first bearing. Thus, the rotation of the gear of the power motor can drive the transmission gear, which in turn drives the first transmission shaft to rotate, thereby driving the two third gears.

[0060] In actual use, each second transmission structure generally consists of a main gear (equivalent to the fifth gear mentioned above), a bevel gear (equivalent to the fourth gear mentioned above), a transmission shaft (equivalent to the second transmission shaft mentioned above), and a second bearing. The main gear and the bevel gear are fixed on the corresponding second transmission shaft.

[0061] The second bearing is sleeved on the corresponding second transmission shaft and fixed to the outer surface of the side wall near the top wall (specifically, the second bearing of one of the second transmission structures can be fixed to the outer surface of the left side wall near the top wall, and the second bearing of the other second transmission structure can be fixed to the outer surface of the right side wall near the top wall). In actual implementation, the bevel gear of the first transmission structure is connected to the bevel gear of the corresponding second transmission structure, the second transmission shaft of the second transmission structure is rotatably connected to the corresponding second bearing, and the main gear of the second transmission structure is then connected to the corresponding moving slide rail. Thus, the two third gear transmissions can drive the fourth gear transmission, which in turn drives the second transmission shaft to rotate, thereby driving the fifth gear transmission. The fifth gear transmission can then drive the moving slide rail to slide up and down along the corresponding stationary slide rail.

[0062] Figure 3 The first bearing has two bearings and the second bearing has four bearings. In practice, the number of the first bearings and the number of the second bearings can be set according to the actual use. This embodiment of the utility model does not limit this.

[0063] For ease of understanding, Figure 2 On this basis, Figure 4 A schematic diagram of another steam oven is also shown, with a detailed description of how the baking tray is connected.

[0064] Specifically, if Figure 4 As shown in the embodiment of this utility model, the steam oven also includes a shelf 6, which is located inside the cooking chamber 1. The shelf 6 is fixedly connected to each movable slide rail 42, and the shelf 6 is also detachably fixedly connected to the baking tray 5.

[0065] In practical applications, the shelf can also be located between the two movable slide rails. Specifically, it can be fixed to the lower end of the two movable slide rails with multiple screws. The shelf is also detachably fixed to the baking pan. During cooking, the baking pan can be placed on the shelf, and after cooking, the baking pan can be removed from the shelf.

[0066] The heating element converts electrical energy into heat to cook food placed in the baking pan. Based on the principle that the closer to the heating element, the higher the temperature, the food can automatically move closer to the heating element during cooking to achieve the desired temperature. For example, during cooking, a rack mounted on a sliding rail moves the baking pan freely up and down, moving it closer to or away from the heating element to obtain the appropriate temperature. The advantage of this method is that it can achieve high-temperature cooking without changing the number and power of the original heating elements. Furthermore, it can be combined with automatic recipes to change different cooking methods during the cooking process, enabling more complex cooking processes, such as baking followed by braising.

[0067] For ease of understanding, Figure 2 On this basis, Figure 5 A schematic diagram of another steam oven is also shown, with a detailed description of the control method of the drive device.

[0068] Specifically, if Figure 5 As shown, the steam oven also includes: a first sensor 7, with a first transparent window provided on the top of the cooking chamber 1, the first sensor 7 being fixedly installed directly above the first transparent window, the first sensor 7 being used to measure the first distance between the baking tray 5 and the heat source 2 in real time; the steam oven also includes a control panel 8, the control panel 8 being installed on the top outer wall of the cooking chamber 1; the control panel 8 being able to send a first signal command to the power motor 31 according to the pre-acquired cooking temperature and the first distance between the heat source 2 and the baking tray 5, so that the power motor 31 drives the first transmission structure 32 and each of the second transmission structures 33 to drive.

[0069] In actual use, the control panel can control the distance between the baking tray and the heating source. The control panel is usually the central controller of the entire steam oven, or it can be a separate controller used to control the drive of the drive device and communicate with the central controller of the steam oven. The distance between the baking tray and the heating source can be set according to the actual use situation. This utility model embodiment does not limit this.

[0070] The aforementioned first sensor, also known as a position detection sensor, is used to detect the vertical distance between the food tray (i.e., the baking pan) and the heat source. The testing principle of this first sensor can be infrared ranging, laser ranging, or ultrasonic radar ranging. The first sensor is installed on the outer wall of the top of the cooking chamber. Through a transparent window, the vertical distance from the food tray to the first position sensor can be measured, thereby determining the vertical distance from the food tray to the heat source (equivalent to the aforementioned first distance). Furthermore, the installation position of the first sensor can be fixed, or it can move back and forth along a line; or it can move on a plane and reach any position on that plane.

[0071] In practice, food is placed at a normal height using a baking tray or similar container. The first sensor acquires test data (the vertical distance from the food tray to the first position sensor) and sends it to the control panel. The control panel can activate the corresponding heating element based on different temperatures and modes input through human-computer interaction, allowing the cooking chamber to reach the desired temperature. If the input temperature is no greater than 250 degrees Celsius, the baking tray remains stationary. If the input temperature is greater than 250 degrees Celsius, after the cooking chamber reaches the maximum achievable temperature of 250 degrees Celsius, the target height corresponding to the current input temperature is determined based on a pre-stored correspondence between cooking temperature and baking tray height. Then, the height difference between the target height and the test data currently acquired by the first sensor is calculated, thereby sending a corresponding first signal command to the power motor (actually, this can be sent to the motor itself, which drives the gears to rotate), causing the sliding rail to move vertically. This moves the baking tray vertically by the calculated height difference to the designated position corresponding to the target height, achieving the best cooking effect.

[0072] The control panel in this embodiment of the invention is typically implemented using a microcontroller unit (MCU), also known as a single-chip microcomputer or microcontroller. It can appropriately reduce the frequency and specifications of a central processing unit (CPU) and integrate peripheral interfaces such as memory, timer, USB, A / D converter, UART, PLC, DMA, and even LCD driver circuitry onto a single chip, forming a chip-level computer to achieve the control function of the steam oven in this embodiment. The specific controller model and parameters can be set according to actual usage; this embodiment does not impose any restrictions on this.

[0073] Furthermore, in Figure 5 On this basis, Figure 6 A schematic diagram of another type of steam oven is also shown, specifically, as follows: Figure 6 As shown, the steam oven also includes a temperature sensor 9, which is installed on the inner wall of the cooking chamber 1 and is used to measure the temperature information inside the cooking chamber 1.

[0074] In fact, the inner sidewall of the cooking chamber can be any sidewall inside the cooking chamber other than the sidewall where the cabinet door is located.

[0075] In practice, to ensure safe use, the controller should also be equipped with an overheat protection function. Specifically, when the temperature sensor detects that the internal temperature of the steam oven is too high, it can send a signal to the controller to automatically reduce the power of the heating element or stop heating to prevent the risk of fire and burns.

[0076] Furthermore, in Figure 5 On this basis, Figure 7 A schematic diagram of another type of steam oven is also shown, specifically, as follows: Figure 7 As shown, the steam oven also includes a sensor 10, which is installed on the top inner wall of the cooking chamber 1. The sensor 10 is used to detect whether there is a human hand between the top of the cooking chamber 1 and the baking tray 5.

[0077] In the specific implementation process, a sensing device (equivalent to the above-mentioned sensing sensor) using the principle of human electrostatic induction or infrared radiation can be installed on the top inner wall of the cooking chamber. When a person's hand is between the top of the cooking chamber and the baking pan, the sensing device can sense the presence of the hand and send a sensing signal to the controller, notifying the controller to stop driving the transmission device to prevent the person from being pinched.

[0078] It should be noted that the principle of the above-mentioned sensing sensors is not limited to human electrostatic induction or infrared detection, and the specific number of the above-mentioned sensing sensors is not limited.

[0079] Furthermore, in Figure 5 On this basis, Figure 8 A schematic diagram of another type of steam oven is also shown, specifically, as follows: Figure 8 As shown, the steam oven also includes a second sensor 11 and a lead screw 12. A rectangular second transparent window is provided on the side wall of the cooking chamber 1. The lead screw 12 is horizontally fixed on one side of the second transparent window. The second sensor sleeve 11 is provided on the lead screw 12. The second sensor 11 can move horizontally along the lead screw 12. The second sensor 11 is used to measure the second distance between the upper and lower surfaces of the food placed in the baking tray 5.

[0080] In practical applications, the aforementioned second sensor is also a position sensor, used to detect the vertical height of food in the baking pan, thereby enabling the controller to control the distance between the food and the heat source. The testing principle of the second sensor can be infrared ranging, laser ranging, or ultrasonic radar ranging. The installation position of the second sensor can be fixed, or it can move back and forth along a certain line; or it can move on a plane and can move to any position on the specified plane.

[0081] Specifically, the second sensor is mounted on the transmission mechanism (equivalent to the aforementioned lead screw) and can randomly reciprocate; and the entire transmission mechanism is assembled on the outer wall of the cooking chamber (actually, it can be the left side wall or the right side wall, as one implementation method). Figure 5 The lead screw is located on the right side wall; the second sensor measures the height of the food inside the cooking chamber through a transparent window on the cooking chamber (equivalent to the aforementioned second transparent window).

[0082] In the specific implementation, the height of the food can be detected by the vertical movement of the baking pan and the horizontal movement of the second sensor. For the specific food height testing procedure, please refer to [link / reference needed]. Figure 9 As shown: The second sensor is reset to zero. The first sensor measures data H1 (the vertical distance from the food tray to the first sensor). It is then determined whether H1 is greater than H0 (the maximum vertical distance from the first sensor to the bottom of the oven). If H1 is greater than H0, it means no tray is placed in the oven, and the food height detection is stopped. If H1 is not greater than H0, it is determined whether the food tray height is at the set initial position (the lowest point of the oven). At this point, the vertical distance from the first sensor to the food tray is HS. If the food tray height is not at the set initial position (H1 not equal to HS), the drive rail moves the tray downwards until it reaches the initial position (H1 equal to HS). Then, the tray movement stops, and the second position sensor determines whether the food height in the tray has reached He.

[0083] Specifically, the second position sensor can be driven back to the initial position A via a transmission mechanism (defined in the side view of the transmission mechanism, the leftmost side is the initial position A, and the rightmost side is the final position B; that is, the side of the transmission mechanism closest to the cabinet door on the side wall is the initial position A, and the side furthest from the cabinet door is the final position B); the height of the second sensor is defined as He (that is, the highest position of the highest point of the food in the food tray); the transmission mechanism of the second sensor (that is... Figure 8 The lead screw in the middle drives the second sensor to scan from the initial position A to the final position B with a specific step distance (such as 10mm or 15mm per step, which can be adjusted according to the actual width of the food covering). During this period, it is determined whether the height of the food in the food tray has reached He (that is, whether the top of the food body is at position He).

[0084] If the height is not reached, the drive unit drives the sliding rail to raise the food tray at a specific step height h (e.g., 100mm or 200mm per step), or the maximum height h is set to half the height difference between the height of the second sensor and the initial height of the food tray (i.e., the food tray moves upward a distance h). It should be noted that the height h of the food tray can be variable and usually needs to be adjusted considering the test duration / height accuracy and whether the height will overshoot. After each rise to the specified height h, the step of the second position sensor determining whether the height of the food in the food tray has reached He is repeated until it is determined that the height of the food in the food tray has reached He. Then, the height of the food is calculated according to the following formula.

[0085] Food height H = He - (N * h); where N = n + 1; n = 0, 1, 2, ...; N = 1, 2, 3, ...; N is the number of times the baking tray rises; h is the height of the food tray each time it rises.

[0086] Furthermore, in the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0087] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0088] Finally, it should be noted that the above embodiments are merely specific implementations of this utility model, used to illustrate the technical solution of this utility model, and not to limit it. The protection scope of this utility model is not limited thereto. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this utility model. These modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A steam oven, characterized in that, The steam oven includes: a cooking chamber, a heating source, a drive device, two vertical lifting devices, and a baking tray; wherein, the heating source is fixedly installed on the top wall of the cooking chamber; each of the two vertical lifting devices includes a static slide rail and a movable slide rail, the two static slide rails are respectively fixedly installed on two opposite side walls inside the cooking chamber, the upper end of the static slide rail extends out of the top of the cooking chamber, and the movable slide rail is slidably connected to the static slide rail; The baking tray is located between the two movable slide rails and is detachably connected to the two movable slide rails, which are connected to the drive device; The driving device is used to drive the two moving slide rails to slide up and down along the corresponding stationary slide rails, so as to move the baking pan up and down in the vertical direction, thereby making the food placed in the baking pan closer to or away from the heat source.

2. The steam oven according to claim 1, characterized in that, The drive device includes a power motor, a first transmission structure, and two second transmission structures connected in sequence. The power motor, the first transmission structure, and the second transmission structures are located on the outer side of the top wall of the cooking chamber. The two second transmission structures are respectively connected to the corresponding moving slide rails.

3. The steam oven according to claim 2, characterized in that, The first transmission structure includes a first transmission shaft, a first bearing, and two third gears; The first bearing is sleeved on the first drive shaft, and the first drive shaft is rotatably fixed on the outer side of the top wall of the cooking chamber via the first bearing. The two third gears are respectively fixed at both ends of the first transmission shaft and are connected to the corresponding second transmission structure. The power motor is connected to the first drive shaft via a transmission gear to drive the first drive shaft to rotate.

4. The steam oven according to claim 3, characterized in that, The second transmission structure includes a fourth gear, a second transmission shaft, a second bearing, and a fifth gear; The second bearing is sleeved on the second drive shaft, and the second drive shaft is rotatably fixed on the outer side surface of the side wall near the top wall via the second bearing; Both the fourth gear and the fifth gear are fixed on the second transmission shaft. The fourth gear is connected to the corresponding third gear in a transmission connection. The fifth gear is connected to the corresponding movable slide rail in a transmission connection.

5. The steam oven according to claim 2, characterized in that, The steam oven also includes a shelf located inside the cooking chamber, the shelf being fixedly connected to each of the movable slide rails, and the shelf being detachably fixedly connected to the baking tray.

6. The steam oven according to claim 1, characterized in that, The steam oven further includes: a first sensor; a first transparent window is provided on the top of the cooking chamber; the first sensor is fixedly installed directly above the first transparent window; the first sensor is used to measure the first distance between the baking tray and the heat source in real time.

7. The steam oven according to claim 1, characterized in that, The steam oven also includes a temperature sensor, which is installed on the inner wall of the cooking chamber and is used to measure the temperature information inside the cooking chamber.

8. The steam oven according to claim 2, characterized in that, The steam oven also includes a control panel, which is installed on the top outer wall of the cooking chamber. The control panel can send a first signal command to the power motor based on the pre-acquired cooking temperature and the first distance between the heat source and the baking tray, so that the power motor drives the first transmission structure and each of the second transmission structures.

9. The steam oven according to claim 1, characterized in that, The steam oven also includes a sensor installed on the top inner wall of the cooking chamber, which is used to detect whether a human hand is present between the top of the cooking chamber and the baking tray.

10. The steam oven according to claim 1, characterized in that, The steam oven further includes a second sensor and a lead screw. A rectangular second transparent window is provided on the side wall of the cooking chamber. The lead screw is horizontally fixed on one side of the second transparent window. The second sensor is sleeved on the lead screw and can move horizontally along the lead screw. The second sensor is used to measure a second distance between the upper and lower surfaces of the food placed in the baking pan.

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