Plate height adjustment mechanism and radio frequency oven with it

Abstract

This application provides an electrode height adjustment mechanism and an RF oven having the same. The electrode height adjustment mechanism includes: an electrode support for supporting the electrode; a nut embedded in a mounting hole of the electrode support; and a screw that passes axially through the mounting hole and threadedly engages with the nut, configured to rotate about its own axis. Through the threaded engagement with the nut, the rotational motion of the screw is converted into linear motion of the electrode support along the screw's axis. This application solves the problems of complex transmission chains, poor stability, and difficulty in achieving precise self-locking positioning in existing electrode adjustment mechanisms.

Description

Technical Field

[0001] This application relates to the field of mechanical technology, and more specifically, to an electrode height adjustment mechanism and a radio frequency oven having the same. Background Technology

[0002] Currently, radio frequency (RF) ovens on the market typically require adjusting the distance between the upper and lower plates to optimize the transmission and reception of RF waves for better defrosting and baking. Existing technology usually employs a dedicated lifting mechanism to achieve this distance adjustment.

[0003] For example, existing technologies employ a gear and rack transmission scheme. A knob drives the gear to rotate, converting the rotational motion into linear motion of the rack, thereby driving the upper plate to move up and down. While this scheme has a relatively compact structure and high transmission efficiency, the gear and rack transmission requires high precision in machining and assembly. After long-term use, the gear teeth are prone to wear, affecting the smoothness of lifting and lowering and positioning accuracy. Furthermore, the rack is prone to misalignment during installation, resulting in a complex overall structure and insufficient stability.

[0004] Another approach uses a screw and a planar four-bar linkage. The screw is driven to rotate by a motor, causing the slider to move axially. The upper plate is then raised or lowered via a multi-stage linkage mechanism. This approach involves a large number of mechanisms, including screw pairs and multiple hinged four-bar linkages. This results in a large number of parts, complex assembly relationships, and a large space requirement. Furthermore, gaps can easily develop at the hinge points during long-term use, affecting the overall stability and reliability.

[0005] Therefore, existing technologies generally suffer from problems such as complex structure, long transmission chain, insufficient stability and high cost. There is an urgent need for a radio frequency electric oven structure that is simple in structure, direct in transmission, has good stability and can achieve precise adjustment of the upper electrode plate. Summary of the Invention

[0006] This application provides an electrode height adjustment mechanism and an RF oven having the same, to solve the problems of complex transmission chains, poor stability, and difficulty in achieving precise self-locking positioning in existing electrode adjustment mechanisms.

[0007] According to one aspect of this application, an electrode height adjustment mechanism is provided, including an electrode support, a nut, and a screw. The electrode support is used to support the electrode. The nut is embedded in a mounting hole in the electrode support. The screw passes axially through the mounting hole and is threadedly engaged with the nut. The screw is capable of rotating around its own axis, and through the threaded engagement with the nut, the rotational motion of the screw is converted into linear motion of the electrode support along the screw axis. This structure has a short transmission chain, is simple and compact, and can achieve stable and reliable lifting adjustment.

[0008] In some embodiments, the mechanism further includes a fixed mounting portion and a guide post; the fixed mounting portion is provided with a screw through hole, and the screw passes through the screw through hole; the guide post is disposed on the fixed mounting portion and arranged parallel to the screw, for guiding the movement of the electrode plate support. This embodiment improves movement stability through guiding constraints, avoiding deviation and jamming.

[0009] In some embodiments, the fixed mounting portion is a plate-shaped structural component of the RF oven, the plate-shaped structural component including an upper inner plate or a lower inner plate; and / or the electrode plate includes an upper electrode plate or a lower electrode plate of the RF oven. This embodiment facilitates adjustment of the electrode plate spacing of the RF oven.

[0010] In some embodiments, a retaining ring is provided between the screw and the fixed mounting portion. The retaining ring is used to axially limit the screw, ensuring that the screw can only rotate around its own axis on the fixed mounting portion. This embodiment effectively prevents axial movement of the screw and ensures a stable and reliable transmission relationship.

[0011] In some embodiments, the mechanism further includes a drive mechanism for providing driving force; the top and / or bottom of the screw are provided with a drive interface, which is a cross-groove structure for transmission connection with the drive mechanism to drive the screw to rotate. This embodiment achieves automated drive and is easy to operate.

[0012] In some embodiments, the electrode plate support is provided with a guide hole that mates with the guide post. The electrode plate support is sleeved on the guide post through the guide hole and moves linearly along the screw axis under the constraint of the guide post; and / or the lower end of the guide post is provided with a limiting surface to limit the maximum stroke of the linear movement of the electrode plate support. This embodiment restricts redundant degrees of freedom, improving lifting accuracy and operational stability.

[0013] In some embodiments, the nut is an embedded structure, fixedly disposed in the mounting hole of the electrode holder by interference fit or fastening connection, forming a rigid connection with the electrode holder without relative movement. This embodiment avoids relative sliding and ensures direct and efficient force transmission.

[0014] In some embodiments, the screw and the nut form a trapezoidal thread pair, so that the electrode support can be held in the target position by self-locking when the drive stops. This embodiment achieves reliable positioning without the need for an additional locking device, reducing structural complexity.

[0015] According to another aspect of the embodiments of this application, an RF oven is also provided, including an RF module for generating RF waves to RF defrost food to be processed; an electrode height adjustment mechanism as described above, fixedly connected to the upper electrode or the lower electrode of the RF module, for adjusting the relative distance between the upper electrode and the lower electrode to optimize the electric field distribution of the RF waves; and an oven module for forming a sealed baking cavity and baking and heating the defrosted food by hot air convection.

[0016] In some embodiments, the radio frequency oven further includes a side heating element module, which is disposed on one outer wall of the inner cavity. The side heating element module includes a side heating element and a side heating element cover. A through hole is provided on the side plate of the inner cavity corresponding to the side heating element, allowing heat generated by the side heating element to radiate into the inner cavity through the through hole. This embodiment enhances lateral heating capability, resulting in more even heating and better browning of food. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0018] Figure 1 This is an exploded view of the radio frequency oven disclosed in the embodiments of this application;

[0019] Figure 2 This is a structural diagram of the radio frequency oven with its door open, as disclosed in the embodiments of this application;

[0020] Figure 3 This is a structural diagram of the radio frequency oven with the door closed, as disclosed in the embodiments of this application;

[0021] Figure 4 This is a rear internal structure diagram of the radio frequency oven disclosed in the embodiments of this application;

[0022] Figure 5 This is a schematic diagram of a radio frequency oven generating radio frequency waves, as disclosed in an embodiment of this application;

[0023] Figure 6 This is a schematic diagram of hot air convection in the radio frequency oven disclosed in the embodiments of this application;

[0024] Figure 7 This is the radio frequency oven disclosed in the embodiments of this application. Figure 6 A magnified view of the I position in the image;

[0025] Figure 8This is a schematic diagram of the upper electrode plate adjustment mechanism module of the radio frequency oven disclosed in this application when the distance is adjusted upward, wherein (B) is an internal structural diagram of the radio frequency oven, and (A) is a partial enlarged view of position E in (B);

[0026] Figure 9 This is a schematic diagram of the upper electrode plate adjustment mechanism module of the radio frequency oven disclosed in this application when it is adjusted downward by a distance, wherein (B) is an internal structural diagram of the radio frequency oven, and (A) is a partial enlarged view of position F in (B);

[0027] Figure 10 This is a structural diagram of the guide post disclosed in the embodiments of this application, wherein (B) is an internal structural diagram of the radio frequency oven, and (A) is a partial enlarged view of the guide post at position G in (B);

[0028] Figure 11 This is a structural diagram of the radio frequency oven with an added side heating management module disclosed in the embodiments of this application;

[0029] Figure 12 This is a schematic diagram of hot air convection in an RF oven with an added side heating management module disclosed in an embodiment of this application;

[0030] Figure 13 This is an exploded view of the radio frequency oven with an added side heating management module disclosed in the embodiments of this application;

[0031] The above figures include the following reference numerals:

[0032] RF Module: 101, Resonant Electronic Board; 102, Cooling Fan; 103, Heat Sink; 105, RF Power Supply; 106, RF Control Power Supply Board; 107, Shielding Plate; 108, First Resonant Electronic Board; 109, Second Resonant Electronic Board; 110, Resonant Electronic Board Support; 111, RF Wave; 112, Upper Electrode; 113, Lower Electrode; 205, Lower Electrode Support;

[0033] Upper electrode plate adjustment mechanism module: 201, screw; 202, nut; 203, retaining ring; 204, upper electrode plate bracket; 206, guide post; 207, limiting surface.

[0034] Oven module: 301, Inner cavity; 302, Door; 303, Control panel; 306, Hot air convection; 3061, Convection fan blades; 3062, Disc-shaped heating element; 3063, Motor; 310, Side heating element module; 3101, Side heating element; 3111, Side heating element cover; 313, Radiant through-hole; 314, Power supply. Detailed Implementation

[0035] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0037] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0038] This embodiment provides an RF oven with an adjustable upper electrode plate height. In this structure, the rotation of a screw drives a nut, which is directly embedded in and fixedly connected to the upper electrode plate bracket. Thus, through the direct action of the nut pair, rotating the screw can drive the upper electrode plate to smoothly rise or fall along the screw axis. This structure achieves the following advantages: short transmission chain, no intermediate conversion mechanism, simple and efficient structure, good stability, self-locking capability, arbitrary stopping capability, no need for additional devices, and low cost.

[0039] The radio frequency (RF) oven provided in this embodiment includes an RF module, an upper electrode plate adjustment mechanism module (also known as an electrode plate height adjustment mechanism), and an oven module. The RF module is located inside the inner cavity and is used to generate an RF field for rapid defrosting of food. The upper electrode plate adjustment mechanism module is located at the upper part of the inner cavity and is connected to the upper electrode plate, used to adjust the distance between the upper and lower electrode plates. The oven module is arranged around the inner cavity and is used to bake the food by heat convection after RF defrosting.

[0040] The following will combine Figures 1 to 10 Provide a detailed description of each component of the radio frequency oven.

[0041] 1) Oven module

[0042] like Figure 1 As shown, the oven module mainly includes an inner cavity 301, a door 302, a control panel 303, a hot air convection system, a motor 3063, a radiant through-hole 313, a power supply 314, and a lower electrode plate bracket 205. The hot air convection system is located on the left side of the inner cavity 301 and mainly consists of a heating element 3062, a convection shroud, and a motor 3063. The convection shroud is connected to the inner cavity 301, with the heating element 3062 located inside the shroud and the motor 3063 located outside. The inner cavity 301 consists of an upper inner plate, a left inner plate, a right inner plate, and a lower inner plate. The right inner plate is connected to the convection shroud and has convection holes. The door 302 consists of an inner door panel, an outer door panel, and a door hinge, and is located at the front of the inner cavity 301. The control panel 303 is located on the right side of the machine and includes a display screen and operation buttons.

[0043] like Figure 2 As shown, in the overall structure of the equipment, the oven module door 302 and control panel 303 are exposed components. The door 302 is located at the front of the inner cavity 301, and the control panel 303 is located at the front right side of the whole machine, which is convenient for users to operate and observe directly.

[0044] like Figure 3 As shown, when the door 302 is closed, it forms a closed heating space with the front opening of the inner cavity 301, preventing hot air leakage and maintaining a stable internal temperature. The door 302 includes an inner door panel, an outer door panel, and a door hinge structure. The door hinge connects the door 302 to the inner cavity 301, allowing the door 302 to open or close around the hinge axis for easy access to food. The inner door panel is made of a high-temperature resistant transparent material, allowing users to easily observe the food heating status, while the outer door panel is made of heat-insulating material to prevent users from being burned.

[0045] like Figure 4 As shown, the radiator 103, cooling fan 102, and power supply module 314 are installed in the rear and side spaces of the oven through a support structure.

[0046] like Figure 5 As shown, the inner cavity 301 is enclosed by an upper inner plate, a left inner plate, a right inner plate, and a lower inner plate to form a sealed heating space. The inner plates are fixedly connected by screws or snap-fit ​​structures to form a stable box structure. Under radio frequency excitation, the upper and lower plates generate a high-frequency alternating voltage, thereby generating radio frequency waves 111 in the space between the plates.

[0047] like Figure 6As shown, the thermal convection system is located on the left side of the inner cavity 301 and is fixed to the side wall of the inner cavity 301 by a bracket. The convection shroud is fixedly connected to the right inner plate of the inner cavity 301. Multiple convection holes are opened on the right inner plate to serve as channels for hot air in and out, enabling air circulation between the inner cavity 301 and the convection shroud. A heating element 3062 is installed inside the convection shroud, and a motor 3063 is installed outside the shroud. The output shaft of the motor 3063 is connected to the convection fan blades 3061, forming an air duct structure, allowing air to circulate between the convection shroud and the inner cavity 301.

[0048] like Figure 6 and Figure 7 As shown, when the thermal convection system is working, the motor 3063 drives the convection fan blade 3061 to rotate, causing air to flow. The air flows through the convection shroud and is heated by passing over the surface of the heating tube 3062. Then, it is sent into the inner cavity 301 through the convection holes and then flows back to the convection shroud through the convection holes on the other side, forming a continuous hot air circulation. Figure 6 The airflow path shown illustrates the circulation process of hot air entering the inner cavity 301 from the convection shroud and then returning, where the hot air convection is as follows: Figure 6 As shown in ①, ⑪ is the air outlet and ⑫ is the air return. Through this circulation, hot air can be evenly distributed inside the inner cavity 301, heating the food from all directions and achieving a uniform baking effect.

[0049] like Figure 7 As shown, the motor 3063 and convection fan 3061 on the outside of the convection shroud provide power for the hot air circulation. The disc-shaped heating element 3062 on the inside of the convection shroud generates stable heat when energized. The two work together to create a stable convection field in the inner cavity 301, ensuring uniform heating. Specifically, the motor 3063 is fixedly mounted on the outer casing of the equipment, with its output shaft extending towards the inner cavity 301. The convection fan 3061 is coaxially mounted on the output shaft. The convection fan 3061 is located outside the disc-shaped heating element 3062 and is coaxially arranged with it, allowing it to rotate synchronously with the output shaft of the motor 3063, thus providing power for the hot air circulation. The disc-shaped heating element 3062 has an annular disc structure and is fixedly installed between the side wall of the inner cavity 301 and the convection fan 3061. It is coaxially arranged with the convection fan 3061. The heating area of ​​the heating element 3062 is directly opposite the airflow path of the convection fan 3061. When the convection fan 3061 rotates, the airflow can directly flow over the surface of the disc-shaped heating element 3062 and be heated to form hot air.

[0050] During operation, the motor 3063 starts, driving the convection fan 3061 to rotate at high speed. The axial airflow generated by the convection fan 3061 draws in cold air from outside the equipment. As the airflow passes over the surface of the disc-shaped heating element 3062, it is heated, forming high-temperature hot air. Subsequently, the hot air, propelled by the convection fan 3061, passes through the radiant through-holes 313 on the side wall of the inner cavity 301 and enters the heating chamber, achieving hot air convection baking of the food. The heat generated by the disc-shaped heating element 3062 after being energized can be quickly transferred to the flowing airflow, ensuring that the air entering the cavity has a sufficient temperature. At the same time, the continuous rotation of the convection fan 3061 causes the hot air to circulate within the inner cavity 301, ensuring uniform heating.

[0051] 2) Radio Frequency Module

[0052] like Figure 5 As shown, the radio frequency module mainly includes a resonant electronic board 101, a cooling fan 102, a heat sink 103, a radio frequency power supply 105, a radio frequency control power supply board 106, a shielding plate 107, a resonant electronic board bracket 110, a radio frequency wave 111, an upper electrode plate 112, and a lower electrode plate 113. The resonant electronic board 101 includes a first resonant electronic board 1011 for connecting to the upper electrode plate and a second resonant electronic board 1012 for connecting to the lower electrode plate. The upper electrode plate 112 is located at the top of the inner cavity 301, the lower electrode plate 113 is located at the bottom of the inner cavity 301, the radio frequency power supply 105 is located on the upper right front side of the inner cavity 301, and the radio frequency generator is located on the rear side of the inner cavity 301 and is electrically connected to the upper electrode plate 112 and the lower electrode plate 113 respectively. The air-cooling system is located on the side of the radio frequency power supply 105 and is used to cool the radio frequency related components.

[0053] Specifically, the upper electrode plate 112 is installed on the top of the inner cavity 301 and is fixed and supported by the upper electrode plate bracket 204; the lower electrode plate 113 is installed on the bottom of the inner cavity 301, opposite to the upper electrode plate 112, forming a radio frequency (RF) action area between them. The RF power supply 105 is located on the upper right front side of the inner cavity 301, providing a stable power input to the RF generator. The RF generator is located on the rear side of the inner cavity 301, with its output terminals electrically connected to both the upper electrode plate 112 and the lower electrode plate 113, providing RF excitation signals to the upper and lower electrodes to establish an RF electric field between them. A cooling system is located on the side of the RF power supply 105, forming a ventilation duct with the outer casing. A fan drives airflow to dissipate heat from the RF power supply 105 and related electronic components, ensuring long-term stable operation of the system.

[0054] The RF power supply 105 is electrically connected to the RF generator to provide it with operating power. The output of the RF generator is connected to the upper electrode 112 and the lower electrode 113 via wires, making the upper and lower electrodes form the RF energy loading terminals. The air-cooling system cools the RF power supply 105 and related components through airflow. Through the above connections, the RF module can form a stable RF electric field in the inner cavity 301 to achieve bulk heating of food.

[0055] The resonant electronic board 101 is installed in the side cavity of the device and is electrically connected to the radio frequency generator and the upper and lower plates. It is used to perform resonant frequency selection, impedance matching and tuning processing on the signal output by the radio frequency generator, thereby optimizing the transmission efficiency of radio frequency energy and enabling radio frequency energy to be coupled more efficiently into the radio frequency field between the upper plate 112 and the lower plate 113.

[0056] 3) Upper electrode plate adjustment mechanism module

[0057] This embodiment takes adjusting the upper electrode plate of an RF oven as an example. Figures 8 to 10 As shown, the upper electrode plate adjustment mechanism module includes an upper inner plate guide post 206, an upper electrode plate bracket 204, a screw 201, a retaining ring 203, and a nut 202. The upper inner plate is provided with a screw through hole, the screw 201 is connected to the upper inner plate and is limited by the retaining ring 203, the screw 201 can rotate 360 ​​degrees, and the top and bottom of the screw 201 are provided with cross grooves; the nut 202 is embedded in the upper electrode plate bracket 204, the upper electrode plate bracket 204 passes through the guide post 206 and is connected to the screw 201, the upper electrode plate 112 is fixed on the upper electrode plate bracket 204, and rotating the screw 201 can adjust the upper electrode plate bracket 204 to move up and down.

[0058] Specifically, such as Figure 8 , Figure 9 As shown, both sides of the upper inner plate are provided with screw through holes and guide post mounting holes. The screw 201 is installed in the screw through hole, and the guide post 206 is installed in the guide post mounting hole, providing support and guidance for the lifting and lowering movement of the upper electrode plate bracket 204. The screw 201 is axially limited by the retaining ring 203, which is engaged between the screw 201 and the upper inner plate, restricting the axial movement of the screw 201 while not hindering its circumferential rotation, allowing the screw 201 to rotate freely 360° on the upper inner plate. The top of the screw 201 is provided with a cross groove for connecting with the drive mechanism to receive power input. The screw 201 adopts a trapezoidal thread structure, forming a threaded pair with the nut 202. Its threaded section penetrates the upper electrode plate bracket 204, converting the rotational motion of the screw 201 into the linear motion of the nut 202.

[0059] The power input terminals of the dual screws 201 are connected to a drive mechanism (such as a motor drive assembly) connected to the internal control circuit of the oven. The synchronous rotation of the dual screws 201 can be achieved via a gear switch on the control panel 303, providing automatic torque input to the adjustment mechanism. The drive mechanism can output power corresponding to the direction and speed selected by the user, driving the dual screws 201 to rotate synchronously, thus achieving smooth lifting and lowering of the upper electrode plate 112.

[0060] Nut 202 is a motion conversion component of the adjustment mechanism. It is fixedly embedded in the corresponding mounting hole of the upper electrode plate bracket 204 via an interference fit or screw connection, forming a rigid connection with the upper electrode plate bracket 204 without relative movement. The internal thread of nut 202 fully engages with the external thread of screw 201. When screw 201 rotates, nut 202 moves linearly along the axis of screw 201 under the action of the threaded pair, thereby driving the upper electrode plate bracket 204 to move synchronously. The integrated design of nut 202 and upper electrode plate bracket 204 eliminates intermediate transmission links and realizes direct power transmission.

[0061] The retaining ring 203 is an axial limiting component for the screw 201, installed at the connection position between the screw 201 and the upper inner plate, such as... Figure 8 , Figure 9 As shown in the enlarged view, the retaining ring 203 adopts an elastic retaining ring structure, which is locked in the annular groove of the screw 201 and abuts against the surface of the upper inner plate, restricting the axial displacement of the screw 201 and preventing the screw 201 from coming out of the screw through hole during rotation or long-term use, ensuring that the threaded pair of the screw 201 and the nut 202 is always in the correct meshing position.

[0062] The upper electrode plate bracket 204 serves as the main support for the adjustment mechanism. It is horizontally arranged, with symmetrical mounting structures at its left and right ends that mate with the screws 201 and guide posts 206. These structures are fitted onto the screws 201 and guide posts 206 and can slide along the axis of the guide posts 206. The upper electrode plate 112 is fixedly mounted to the bottom of the upper electrode plate bracket 204 using screws or clips, allowing the upper electrode plate 112 to rise and fall synchronously with the bracket. The upper electrode plate bracket 204 is made of high-strength rigid material, possessing excellent structural stability. It can reliably support the weight of the upper electrode plate 112 and remain horizontal during lifting and lowering, preventing the upper electrode plate 112 from tilting and affecting the radio frequency electric field distribution.

[0063] Guide column 206 is a motion guide component of the adjustment mechanism, such as Figure 10As shown, each guide post 206 is a smooth cylindrical structure, fixedly installed on the upper inner plate, and positioned next to the screw 201. The axial direction of the guide post 206 is parallel to the axial direction of the screw 201. The upper electrode plate bracket 204 has guide holes that mate with the guide posts 206. The upper electrode plate bracket is fitted onto the guide posts 206 through the guide holes. The cylindrical surface of the guide post 206 mates with the inner wall of the guide hole, restricting the circumferential rotation and horizontal offset of the upper electrode plate bracket 204. This ensures that the bracket can only move linearly along the axial direction of the guide post 206, preventing tilting, jamming, or shaking during lifting and lowering, and improving the stability and positioning accuracy of the adjustment process. The guide post 206 is connected and fixed to the upper inner plate, and its lower end is provided with a limiting surface 207, which can limit the lowest position of the upper electrode plate bracket 204 to prevent excessive descent.

[0064] When the height of the upper electrode plate needs to be adjusted, the user selects the corresponding gear via the control panel 303. After receiving the control signal, the drive mechanism drives the double-sided screws 201 to rotate synchronously. Under the limiting action of the retaining ring 203, the screws 201 rotate in place, driving the nut 202 to move along the axis of the screws 201 through the threaded pair. The nut 202 is rigidly connected to the upper electrode plate bracket 204, thus driving the upper electrode plate bracket 204 to rise and fall synchronously along the double-sided guide posts 206. The guide posts 206 limit the horizontal displacement of the upper electrode plate bracket 204, ensuring that the upper plate bracket always maintains horizontal movement. The upper electrode plate 112 moves synchronously with the bracket, thereby changing the distance between the upper electrode plate 112 and the lower electrode plate 113. When the screws 201 stop rotating, the self-locking characteristic of the trapezoidal thread can lock the nut 202 in the current position, allowing the upper electrode plate 112 to stop at any height without the need for an additional locking device, while also bearing the weight of the upper electrode plate 112 and preventing it from sliding down automatically.

[0065] Figure 8 The image shows the upper electrode plate 112 being adjusted upwards. At this time, the upper electrode plate support 204 moves upwards along the screw 201 and guide post 206, and the distance between the upper electrode plate 112 and the lower electrode plate 113 increases to H1. Figure 9 The image shows the upper electrode plate 112 being adjusted downwards. At this time, the upper electrode plate support 204 moves downwards along the screw 201 and guide post 206, and the distance between the upper electrode plate 112 and the lower electrode plate 113 is reduced to H2. Figure 10The diagram shows the limited position of the guide post 206. The limiting surface 207 at the lower end of the guide post 206 restricts the lowest position of the upper electrode plate bracket 204, preventing excessive descent and potential collision damage. This adjustment mechanism achieves direct conversion from rotary motion to linear motion through the direct engagement of the double-sided screws 201 and nuts 202. It features a short transmission chain, simple structure, and high transmission efficiency. Simultaneously, the double-sided guide posts 206 and synchronous drive design ensure smooth movement and positioning accuracy. Reliable locking without additional devices is achieved through threaded self-locking. The overall structure is compact, low-cost, and exhibits good long-term operational stability, adapting to the automated adjustment needs of oven equipment and improving user convenience.

[0066] In this application, the core improvement of the electrode height adjustment mechanism lies in achieving stepless adjustment of the electrode height through the direct engagement of the screw and nut. This improvement is not only applicable to the scheme where the upper electrode support drives the upper electrode to rise and fall, but can also be directly applied to the scenario where the lower electrode support drives the lower electrode to rise and fall, or simultaneously applied to the bidirectional adjustment structure of the upper and lower electrode supports. Those skilled in the art can select any one or more combinations of the above methods according to the actual needs such as the internal spatial layout of the equipment and the installation position of the drive mechanism. As long as the core purpose is to adjust the relative distance between the upper and lower electrode plates to optimize the radio frequency electric field distribution, all such methods fall within the scope of protection covered by this application.

[0067] The operation process of the RF oven will be described in detail below.

[0068] First, after the oven is started, based on the volume, thickness, and defrosting requirements of the food to be processed, the user issues an adjustment command through the control panel 303, driving the upper plate adjustment mechanism module to work. The drive mechanism drives the screw 201 to rotate around its own axis. Since the screw 201 is axially limited by the retaining ring 203, it only rotates without axial displacement. The nut 202, which is threaded into the screw 201, undergoes linear displacement along the axis of the screw 201 due to the side effect of the thread. Since the nut 202 is embedded and fixed in the upper plate bracket 204, the axial movement of the nut 202 directly drives the upper plate bracket 204 to rise and fall synchronously. At the same time, under the constraint of the guide post 206, the upper plate bracket 204 only moves linearly in the vertical direction, thus ensuring that the upper plate 112 remains horizontal during the rising and falling process. Through the above process, the precise adjustment of the distance between the upper plate 112 and the lower plate 113 is achieved. When the screw 201 stops rotating, the upper electrode plate 112 can remain stably in the target position due to the self-locking characteristics of the threaded pair, without the need for an additional locking structure.

[0069] After the upper plate 112 is positioned, the device enters the radio frequency (RF) defrosting stage. The RF power supply 105 provides stable power to the RF generator, which outputs a high-frequency electrical signal. This signal, after resonant frequency selection and impedance matching by the resonant electronic board 101, is applied to the upper plate 112 and the lower plate 113, creating a stable RF electric field between the two plates. The food to be processed is placed between the upper and lower plates. Under the influence of the RF electric field, its internal polar molecules oscillate at high frequency, generating heat within the food and achieving rapid defrosting from the inside out.

[0070] Once the food has defrosted, the oven switches to the oven module for heat processing. The heating element 3062 in the heat convection system generates heat when energized, and the motor 3063 drives the convection fan 3061 to rotate, causing air to circulate between the convection shroud and the inner cavity 301. As the air flows over the surface of the heating element 3062, it is heated, forming hot air. This hot air then enters the inner cavity through the radiant openings 313 on the side wall of the inner cavity 301, heating the food surface. It then flows back to the convection shroud via the other side of the inner cavity 301, forming a closed-loop hot air circulation path. During this circulation, the hot air continuously flows and is evenly distributed, gradually heating the food surface and producing a browning effect, achieving external baking.

[0071] Through the above operating procedures, the RF module and the oven module form a collaborative working mechanism: the former enables rapid and uniform defrosting of food, while the latter enables hot air baking and browning of the food surface; the upper electrode adjustment mechanism module, by precisely adjusting the electrode spacing, optimizes the RF field distribution, thereby improving overall heating efficiency and processing quality. Throughout the process, the direct drive structure formed by the screw 201 and nut 202 effectively simplifies the transmission chain, ensuring the stability and reliability of the adjustment process. Simultaneously, its self-locking characteristic enables position holding, further reducing system complexity and manufacturing costs.

[0072] This application also provides an embodiment of a radio frequency oven with another structure, the main difference between which is as follows: Figures 11 to 13 As shown, a side heating tube module 310 is added to the left side of the inner cavity 301. This module works in conjunction with the original hot air convection heating system to further improve the uniformity of baking and heating. The rest of the structure is consistent with the aforementioned embodiment and will not be described again here.

[0073] Specifically, the side heating element module 310 includes a side heating element 3101 and a side heating element cover 3111, which are fixedly installed on the left outer wall of the inner cavity 301. Figure 11 , Figure 13As shown. The side heating tube cover 3111 is installed on the outside of the side heating tube 3101, which not only protects and insulates the side heating tube 3101, but also guides the heat generated by the side heating tube 3101 to radiate into the inner cavity 301. A radiation through hole 313 is opened on the left side plate of the inner cavity 301, through which the heat of the side heating tube 3101 can be directly radiated into the inner cavity 301 to form a lateral radiation heating area.

[0074] After radio frequency defrosting is completed, when the oven module is working, the side heating element 3101 is simultaneously powered on. The heat it generates is directly applied to the food in the inner cavity 301 through the radiation through-hole 313 on the left side plate in the form of thermal radiation. This works in conjunction with the circulating hot air field formed by the hot air convection system. Figure 12 As shown, the hot air generated by the hot air convection system circulates within the inner cavity 301, while the lateral radiant heat provided by the side heating tube 3101 supplements the heating amount in the edge area of ​​the cavity, making up for the deficiency of the low temperature at the edge of the cavity when heating with single hot air convection. This makes the food heat more evenly during baking, and the browning effect is more consistent, effectively avoiding the problems of local burning or uneven browning.

[0075] The side heating element module 310 is fixed to the outer left side of the inner cavity 301 with screws. A heat insulation pad is provided between the module and the inner cavity 301 to prevent heat from being conducted to the outer shell of the equipment. The side heating element cover 3111 is made of high-temperature resistant metal material, which can effectively reflect the heat of the side heating element 3101, reduce heat loss to the outside of the equipment, improve heat utilization, and at the same time avoid direct contact between the side heating element 3101 and other parts of the equipment, thereby improving the safety and stability of the equipment.

[0076] Top of form

[0077] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0078] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0079] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A plate height adjusting mechanism characterized by comprising: include: Electrode support, used to support the electrode plates; Nuts are fitted into the mounting holes of the electrode plate bracket; The screw, which passes through the mounting hole axially and engages with the nut threadedly, is configured to rotate about its own axis and, through the threaded engagement with the nut, converts the rotational motion of the screw into the linear motion of the electrode plate support along the screw axis.

2. The mechanism of claim 1, wherein, Also includes: A fixed mounting part is provided with a screw through hole, and the screw passes through the screw through hole; A guide post is disposed on the fixed mounting part and arranged parallel to the screw, and is used to guide the linear movement of the electrode plate bracket.

3. The mechanism according to claim 2, characterized in that, The fixed mounting part is a plate-shaped structural component of the radio frequency oven; the plate-shaped structural component includes an upper inner plate or a lower inner plate; and / or The electrode plate includes the upper electrode plate or the lower electrode plate of the radio frequency oven.

4. The mechanism according to claim 2, characterized in that, A retaining ring is provided between the screw and the fixed mounting part. The retaining ring is used to axially limit the screw, so that the screw can only rotate around its own axis on the fixed mounting part.

5. The mechanism according to claim 4, characterized in that, The mechanism also includes a drive mechanism for providing driving force; The top and / or bottom of the screw are provided with a drive interface, which is a cross-groove structure for transmission connection with the drive mechanism to drive the screw to rotate.

6. The mechanism according to claim 2, characterized in that, The electrode plate support is provided with a guide hole that mates with the guide post. The electrode plate support is sleeved on the guide post through the guide hole and performs linear motion along the screw axis under the constraint of the guide post; and / or The lower end of the guide post is provided with a limiting surface to limit the maximum stroke of the linear motion of the electrode plate support.

7. The mechanism of claim 2, wherein, The nut is an embedded structure, which is fixed in the mounting hole of the electrode bracket by interference fit or fastening connection, and forms a rigid connection with the electrode bracket without relative movement.

8. The mechanism of claim 2, wherein, The screw and the nut form a trapezoidal thread pair, so that the electrode plate support can be held in the target position by self-locking when the drive stops.

9. A radio frequency oven characterized by, include: The radio frequency module is used to generate radio frequency waves to defrost the food to be processed. The electrode height adjustment mechanism as described in any one of claims 1 to 8 is fixedly connected to the upper electrode and / or lower electrode of the radio frequency module, and is used to adjust the relative distance between the upper electrode and the lower electrode to optimize the electric field distribution of the radio frequency wave; An oven module is used to form a sealed baking cavity and to bake and heat the thawed food by means of hot air convection.

10. The radio frequency oven of claim 9, wherein, It also includes a side heating tube module, which is disposed on one side of the outer wall of the inner cavity of the radio frequency oven. The side heating tube module includes a side heating tube and a side heating tube cover. The side plate of the inner cavity has a through hole corresponding to the side heating tube, so that the heat generated by the side heating tube can be radiated into the inner cavity through the through hole.

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