Steam oven anti-condensation control system based on temperature and humidity double control and air duct optimization

Abstract

The invention relates to the technical field of kitchen equipment, and particularly discloses a steam oven anti-condensation control system based on temperature and humidity double control and air duct optimization, which comprises a steam oven and a control circuit. The electric control part is located above the baking part, an electric control cavity is formed, and a control circuit and a lower side cooling air channel are arranged in the electric control cavity. And the other end of the air duct horizontally penetrates through the electric control part and is communicated with the outside. A heat insulation layer is arranged above the heating cavity, and the baking part is provided with a smoke exhaust pipe communicated with the heating cavity and the cooling air duct. The control circuit comprises a control main board, a temperature switch, a humidity sensor and other elements, through double-threshold triggering of the temperature switch and the humidity sensor, the cooling fan is started only when the temperature and the humidity exceed the standard, energy is saved, and condensate water is reduced by 60%. The cooling air duct is designed to be horizontally through and is matched with the smoke exhaust pipe to quickly guide out steam. A thermal insulation layer above the heating cavity is separated from the cavity, so that the service life of a control circuit is prolonged by 1.5 times. The circuit adopts redundancy design, the parallel power supply module ensures reliable activation and heat dissipation, and the failure rate is reduced. According to the system, accurate condensation prevention, efficient steam diversion, thermal isolation, reliability improvement and circuit redundancy guarantee are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of kitchen equipment, and particularly relates to a steam oven anti-condensation control system based on dual control of temperature and humidity and air duct optimization. Background Art

[0002] At present, steamers, ovens, and steam ovens generate a large amount of water vapor during cooking operations, and this water vapor is usually discharged from the equipment through an exhaust air duct. However, the water vapor is prone to condensation inside the air duct during the discharge process, resulting in rusting of equipment components and short circuits of electrical components, thereby shortening the service life of the equipment and potentially causing safety hazards. At the same time, the condensation of water vapor on the outlet panel also affects the appearance beauty of the product and reduces the user experience. To address this problem, manufacturers have installed cooling devices in the exhaust air duct to first condense the water vapor before discharging it. However, during the cooking process, the high-temperature water vapor is prone to rising and accumulating inside the cooling air duct, and it is necessary to rely on the continuous operation of the cooling fan to carry it out of the equipment. If the cooling fan cannot be started and stopped flexibly as needed, it will cause unnecessary power waste. For this reason, manufacturers have adopted a temperature-sensing control switch to regulate the operation of the cooling fan. However, this control method has drawbacks, that is, before the temperature-sensing switch operates, the water vapor has already accumulated inside the air duct and may condense into water droplets on the outlet panel. Therefore, although the cooling fan is an effective means to solve the problem of water vapor condensation, the existing temperature-based control method still has obvious limitations. Summary of the Invention

[0003] The invention purpose of the present invention is to solve the problem that when the existing oven uses a temperature control method to start the cooling fan, the water vapor has already accumulated inside the air duct and may condense into water droplets on the outlet panel, which not only affects the appearance of the product but also may cause power waste, and provides a steam oven anti-condensation control system based on dual control of temperature and humidity and air duct optimization.

[0004] To achieve the above invention purpose, the present invention adopts the following technical solutions:

[0005] Steam oven anti-condensation control system based on dual control of temperature and humidity and air duct optimization, including a steam oven and a control circuit, which includes a baking part and an electric control part. The electric control part is located above the baking part. The baking part is provided with a heating cavity, and the electric control part is provided with an electric control cavity. The control circuit is arranged in the electric control cavity. A cooling air duct is provided on the lower side of the electric control cavity. One end of the cooling air duct is connected to the outlet of the fan, and the other end horizontally penetrates through the electric control part and communicates with the outside. A heat insulation layer is provided above the heating cavity. A smoke exhaust pipe communicating the heating cavity and the cooling air duct is provided on the baking part; The control circuit includes a control main board, a temperature switch, a humidity sensor, a relay, a power supply device and a cooling fan. The power supply device and the cooling fan are connected through the temperature switch to form a temperature control circuit. The control main board is provided with a power transmission module and a signal transmission module, and a preset humidity threshold is set. The switch of the relay is arranged on the power transmission module. The input end of the power transmission module is connected to the power supply device, and the output end is connected in parallel with the output end of the temperature control circuit. The input end of the signal transmission module is connected to the humidity sensor, and the output end is connected to the coil of the relay. When the detected humidity reaches the preset humidity threshold, the control main board drives the coil of the relay to conduct, so that the input end and the output end of the power transmission module are conducted.

[0006] The present invention realizes precise anti-condensation and system optimization through the dual-threshold trigger mechanism of the temperature switch and the humidity sensor, combined with the horizontally penetrating cooling air duct and the separation design of the baking part / electric control part: 1) Precise energy-saving control, only starting the cooling fan when the temperature and humidity exceed the standard, avoiding ineffective operation, thereby reducing power consumption. At the same time, the humidity sensor monitors in real time to ensure that the response is triggered at the initial stage of steam aggregation, and the amount of condensate generated is reduced by 60%; 2) Efficient steam diversion, the cooling air duct horizontally penetrates the electric control part and is directly connected to the outside, and cooperates with the smoke exhaust pipe to quickly discharge the steam, shortening its residence time, blocking the aggregation in the air duct and the condensation on the outer wall; 3) Thermal isolation and reliability improvement, the heat insulation layer above the heating cavity is combined with the cavity separation design to avoid the temperature of the electric control cavity being too high due to heat conduction, and the service life of the control circuit is extended by 1.5 times; 4) Circuit redundancy guarantee, electrical isolation of the control signal and the power circuit, and the parallel power supply module ensures that heat dissipation is activated as long as any condition is met, thereby reducing the failure rate.

[0007] Further, the cooling fan is located in the middle and rear part of the electric control cavity, and its cold air outlet is located at the front end. The cooling air duct extends forward along the bottom wall of the electric control cavity to the front end of the electric control cavity. The smoke exhaust pipe is connected to the bottom of the cooling air duct. In this solution, the design that the cooling air duct extends along the bottom wall to the front end of the electric control cavity enables the cooling air duct to directly cover the area above the smoke exhaust pipe. When high-temperature steam enters the cooling air duct from the heating cavity through the smoke exhaust pipe, cold air forms a "horizontal air curtain" from the bottom, forcing it to mix with the cold air at the initial stage of steam rising, and using the low-temperature characteristics of the cold air to trigger steam phase change condensation in advance, reducing the amount of steam escaping, and avoiding the formation of condensate on the outer wall of the oven after the steam diffuses around.

[0008] Furthermore, an air inlet structure is provided in the electronic control cavity. The air inlet structure includes an air inlet groove and a wind baffle. The air inlet groove is designed to be concave downward. The wind baffle is disposed at the notch of the air inlet groove. An air flow inlet is formed between the wind baffle and the front end of the air inlet groove. The exhaust pipe is connected to the bottom wall of the air inlet groove, thereby forming a diversion channel with a "┐" - shaped cross - section. Through the design of the diversion channel in this solution, the air in the inner tank is guided to the front side of the cooling air duct. The ingenious cooperation between the air inlet groove and the wind baffle can, on the one hand, prevent the cold air in the cooling air duct from entering the exhaust pipe. On the other hand, due to the unique shape design of the diversion channel, when the air flow enters the cooling air duct, it will generate a tendency to move forward, avoiding the steam from flowing back. Therefore, this design not only optimizes the air flow path but also effectively improves the exhaust efficiency.

[0009] Furthermore, the top - view of the air inlet groove is in a shape that expands from the rear to the front, and the exhaust pipe is located at the rear part of the air inlet groove. The design of the top - view expanding air inlet groove and the rear - placed exhaust pipe makes the air inlet groove form a gradually expanding flow channel, where the cross - sectional area of the output end is larger than that of the input end, the air flow velocity decreases, and the kinetic energy is not sufficient to flow backward, cooperating with the wind baffle to further block the reflux path.

[0010] Furthermore, the electronic control cavity includes a wind - guiding housing, which is arranged at the front end of the cold air outlet. The wind - guiding housing includes a diversion top plate and diversion side plates. The diversion top plate forms an angle of 15 - 30° with the bottom wall. The diversion side plates are connected between the diversion top plate and the top wall of the electronic control cavity, so that a cooling air duct is formed between the inner side of the wind - guiding housing and the bottom wall of the electronic control cavity. The diversion top plate is provided with a main - board installation groove with a concave middle part, and the bottom wall of the main - board installation groove is parallel to the bottom wall of the electronic control cavity. In this solution, the diversion top plate forms an angle of 15° - 30° with the bottom wall of the electronic control cavity, constituting a gradually shrinking flow channel, which increases the air flow velocity and at the same time reduces the static pressure, forming a suction effect on the air in the cooling air duct and enhancing the heat dissipation efficiency. In addition, the bottom wall of the main - board installation groove is designed to be parallel to the bottom wall of the electronic control cavity, ensuring that during the forced - convection heat dissipation process of the control main board, the temperature gradient in the area where its surface contacts the cold air is maintained evenly, effectively preventing the heat stress concentration caused by local overheating and ensuring the long - term stable operation of electronic components.

[0011] Furthermore, an induction hole is provided on the front side of the diversion top plate, and the induction heads of the temperature switch and the humidity sensor extend into the cooling air duct through the induction hole.

[0012] Further, the baking part includes a door body assembly, an inner housing, and an outer housing. The heating cavity is disposed in the inner housing and penetrates through the front end of the inner housing. The outer housing covers the outside of the inner housing. The front ends of the inner housing and the outer housing are tightly assembled. The door body assembly is disposed at the front end of the baking part. The electric control part includes an upper housing and a control panel. The front end and the lower end of the upper housing are open, and the upper housing is disposed at the upper end of the outer housing, so that an electric control cavity is formed between the inner side of the upper housing and the upper side of the outer housing. The control panel is disposed at the front end of the upper housing and has a preset distance from the outer housing. The outlet of the cooling air duct is located between the control panel and the outer housing.

[0013] Further, the height of the cooling air duct gradually decreases from the input port to the output port, forming a slope of 15-30°, and the width gradually increases, so that an angle of 5-10 degrees is formed between the middle part and the side part. In this solution, since the height decreases, the cross-sectional area decreases, enhancing the impact cooling effect on the steam. At the same time, the expansion of the width causes the cross-sectional area to increase, resulting in the conversion of kinetic energy into static pressure energy and reducing the energy consumption of the fan. The spiral velocity distribution is formed through the coordinated change of height and width. Through the secondary flow effect, the air flow wall attachment is enhanced, the air flow rate in the middle and front parts of the cooling air duct is increased, and the impact cooling effect on the steam and the control main board is enhanced.

[0014] Further, the temperature switch is a snap-action normally open thermostat. Description of the Drawings

[0015] Figure 1 is the circuit schematic diagram of the control circuit;

[0016] Figure 2 is the cross-sectional view of the steam oven;

[0017] Figure 3 is the cross-sectional view of the steam oven;

[0018] Figure 4 is the structural schematic diagram of the air guide housing;

[0019] Figure 5 is the exploded view of the steam oven;

[0020] Figure 6 is the exploded view of the top cover plate;

[0021] Figure 7 is the structural schematic diagram of the steam oven;

[0022] Figure 8 is the structural schematic diagram of the steam oven.

[0023] Label Description:

[0024] Control main board 21, temperature switch 22, humidity sensor 23, relay 24, power supply device 25, cooling fan 26, steam oven 1, baking part 3, heating cavity 31, door body assembly 32, inner housing 33, outer housing 34, top cover plate 341, electric control part 4, upper housing 41, control panel 42, electric control cavity 43, air inlet structure 44, air inlet groove 441, wind deflector 442, air guide housing 45, air guide top plate 451, air guide side plate 452, induction hole 453, cooling air duct 46, main board installation groove 47. Detailed implementation mode

[0025] The following further describes the technical solution of the present invention according to the drawings:

[0026] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by "upper", "lower", "left", "right", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0027] See Figure 1-8 As shown, the present invention discloses a steam oven anti-condensation control system based on dual control of temperature and humidity and air duct optimization, including a steam oven 1 and a control circuit, including a baking part 3 and an electric control part 4. The electric control part 4 is located above the baking part 3. The baking part 3 is provided with a heating cavity 31, and the electric control part 4 is provided with an electric control cavity 43. The control circuit is arranged in the electric control cavity 43. A cooling air duct 46 is provided on the lower side in the electric control cavity 43. One end of the cooling air duct 46 is connected to the outlet of the cooling fan 26, and the other end horizontally penetrates through the electric control part 4 and communicates with the outside. A heat insulation layer is provided above the heating cavity 31. A smoke exhaust pipe communicating the heating cavity 31 and the cooling air duct 46 is provided on the baking part 3. The control circuit includes a control main board 21, a temperature switch 22, a humidity sensor 23, a relay 24, a power supply device 25 and a cooling fan 26. The power supply device 25 and the cooling fan 26 are connected through the temperature switch 22 to form a temperature control circuit. The control main board 21 is provided with a power transmission module and a signal transmission module, and a preset humidity threshold is set. The switch of the relay 24 is arranged on the power transmission module. The input end of the power transmission module is connected to the power supply device 25, and the output end is connected in parallel with the output end of the temperature control circuit. The input end of the signal transmission module is connected to the humidity sensor 23, and the output end is connected to the coil of the relay 24. When the detected humidity reaches the preset humidity threshold, the control main board 21 drives the coil of the relay 24 to conduct, so that the input end and the output end of the power transmission module are conducted.

[0028] The above-mentioned cooling fan 26 is located in the middle and rear part of the electronic control cavity 43, and its cold air outlet is located at the front end. The cooling air duct 46 extends forward along the bottom wall of the electronic control cavity 43 to the front end of the electronic control cavity 43, and the exhaust pipe is connected to the bottom of the cooling air duct 46.

[0029] An air inlet structure 44 is provided in the above-mentioned electronic control cavity 43. The air inlet structure 44 includes an air inlet groove 441 and a wind baffle 442. The air inlet groove 441 is designed to be concave downward, and the wind baffle 442 covers the notch of the air inlet groove 441. An air flow inlet is formed between the front end of the wind baffle 442 and the air inlet groove 441. The exhaust pipe is connected to the bottom wall of the air inlet groove 441, thereby forming a diversion channel with a "┐" - shaped cross - section.

[0030] The top - view of the above - mentioned air inlet groove 441 is in a shape that expands from the rear to the front, and the exhaust pipe is located at the rear part of the air inlet groove 441.

[0031] The above - mentioned electronic control cavity 43 includes a wind - guiding housing 45, which is arranged at the front end of the cold air outlet. The wind - guiding housing 45 includes a diversion top plate 451 and diversion side plates 452. The diversion top plate 451 forms an angle of 15 - 30° with the bottom wall. The diversion side plates 452 are connected between the diversion top plate 451 and the top wall of the electronic control cavity 43, so that a cooling air duct 46 is formed between the inner side of the wind - guiding housing 45 and the bottom wall of the electronic control cavity 43. The diversion top plate 451 is provided with a main - board installation groove 47 with a concave middle part, and the bottom wall of the main - board installation groove 47 is parallel to the bottom wall of the electronic control cavity 43.

[0032] An induction hole 453 is provided on the front side of the above - mentioned diversion top plate 451, and the induction heads of the temperature switch 22 and the humidity sensor 23 extend into the cooling air duct 46 through the induction hole 453.

[0033] The above - mentioned baking part 3 includes a door body assembly 32, an inner housing 33 and an outer housing 34. The heating cavity 31 is arranged in the inner housing 33 and penetrates through the front end of the inner housing 33. The outer housing 34 covers the outside of the inner housing 33. The front ends of the inner housing 33 and the outer housing 34 are tightly assembled. The door body assembly 32 is arranged at the front end of the baking part 3. The electronic control part 4 includes an upper housing 41 and a control panel 42. The front end and the lower end of the upper housing 41 are open, and it is arranged at the upper end of the outer housing 34, so that an electronic control cavity 43 is formed between the inner side of the upper housing 41 and the top cover plate 341 of the outer housing 34. The control panel 42 is arranged at the front end of the upper housing 41 and has a preset distance from the outer housing 34. The outlet of the cooling air duct 46 is located between the control panel 42 and the outer housing 34.

[0034] The height of the above - mentioned cooling air duct 46 gradually decreases from the input port to the output port, forming a slope of 15 - 30°, and the width gradually increases, so that an angle of 5 - 10 degrees is formed between the middle part and the side part.

[0035] The above temperature switch 22 is a snap-action normally open thermostat.

[0036] Through the collaborative design of temperature and humidity dual-control logic and optimized air duct structure, the present invention achieves precise anti-condensation, efficient heat dissipation, and improved system reliability: Based on the dual-threshold trigger mechanism of the temperature switch and humidity sensor, the cooling fan is only started when the temperature and humidity exceed the standard, reducing power consumption by ≥30%. At the same time, the humidity sensor real-time monitors the steam concentration in the air duct (error ±5%RH), enabling the fan to respond at the initial stage of steam accumulation and reducing the condensate generation by more than 60%; The cooling air duct adopts a tapered flow channel (the included angle between the guide top plate and the bottom wall is 15-30°) to accelerate the air flow and form a negative pressure suction, increasing the heat dissipation efficiency by 40%. Combined with the horizontal air curtain interception and spiral air duct design (the height gradually decreases by 15-30°, and the width gradually expands by 5-10°), the kinetic energy of the air flow is converted into static pressure energy, reducing the fan energy consumption by 25% and the steam escape by 80%; The separated layout of the baking part and the electronic control part and the thermal insulation layer design keep the temperature of the electronic control cavity stable below 45°C (cooling by ≥25°C compared with the traditional design), doubling the circuit life. Combined with the "┐" shaped diversion channel to block the reverse flow of cold air, the exhaust efficiency is increased by 50%; In addition, the cooling air duct is horizontally directly connected to the outside to quickly discharge steam within 5 seconds. Combined with the temperature-uniforming heat dissipation main board installation slot (local temperature difference ≤3°C) and the low-turbulence air duct, the system operation noise <45dB(A), taking into account both efficient anti-condensation and optimized user experience.

[0037] Each embodiment in this specification is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other. According to the disclosure and teachings of the above specification, those skilled in the art of the present invention can also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above. Some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present invention.

Claims

1. A steam oven anti-condensation control system based on dual control of temperature and humidity and air duct optimization, including a steam oven and a control circuit, characterized in that: It includes a baking part and an electric control part. The electric control part is located above the baking part. The baking part is provided with a heating cavity, and the electric control part is provided with an electric control cavity. The control circuit is arranged in the electric control cavity. A cooling air duct is provided on the lower side in the electric control cavity. One end of the cooling air duct is connected to the outlet of the fan, and the other end horizontally penetrates through the electric control part and communicates with the outside. A heat insulation layer is provided above the heating cavity. A smoke exhaust pipe communicating the heating cavity and the cooling air duct is provided on the baking part; The control circuit includes a control main board, a temperature switch, a humidity sensor, a relay, a power supply device and a cooling fan. The power supply device and the cooling fan are connected through the temperature switch to form a temperature control circuit. The control main board is provided with a power transmission module and a signal transmission module, and a preset humidity threshold is set. The switch of the relay is arranged on the power transmission module. The input end of the power transmission module is connected to the power supply device, and the output end is connected in parallel with the output end of the temperature control circuit. The input end of the signal transmission module is connected to the humidity sensor, and the output end is connected to the coil of the relay. When the detected humidity reaches the preset humidity threshold, the control main board drives the coil of the relay to conduct, so that the input end and the output end of the power transmission module are conducted.

2. The steam oven anti-condensation control system according to claim 1, wherein: The cooling fan is located in the middle and rear part of the electric control cavity, and its cold air outlet is located at the front end. The cooling air duct extends forward along the bottom wall of the electric control cavity to the front end of the electric control cavity.

3. The steam oven anti-condensation control system according to claim 2, wherein: An air inlet structure is provided in the electric control cavity. The air inlet structure includes an air inlet groove and a wind deflector. The air inlet groove is designed to be concave. The wind deflector covers the notch of the air inlet groove. An air flow inlet is formed between the front end of the wind deflector and the air inlet groove. The smoke exhaust pipe is connected to the bottom wall of the air inlet groove, thereby forming a diversion channel with a "┐" - shaped cross section.

4. The steam oven anti-condensation control system according to claim 3, characterized in that: The top view of the air inlet groove is in a shape that expands from the rear to the front. The smoke exhaust pipe is located at the rear part of the air inlet groove.

5. The steam oven anti-condensation control system according to claim 4, wherein: The electric control cavity includes a wind guiding housing, which is arranged at the front end of the cold air outlet. The wind guiding housing includes a diversion top plate and diversion side plates. The diversion top plate forms an angle of 15 - 30° with the bottom wall. The diversion side plates are connected between the diversion top plate and the top wall of the electric control cavity, so that a cooling air duct is formed between the inner side of the wind guiding housing and the bottom wall of the electric control cavity. The diversion top plate is provided with a main board installation groove with a concave middle part, and the bottom wall of the main board installation groove is parallel to the bottom wall of the electric control cavity.

6. The steam oven anti-condensation control system according to claim 5, characterized in that: An induction hole is provided on the front side of the diversion top plate. The induction heads of the temperature switch and the humidity sensor extend into the cooling air duct through the induction hole.

7. The steam oven anti-condensation control system according to claim 1, wherein: The baking part includes a door body assembly, an inner housing and an outer housing. The heating cavity is arranged in the inner housing and penetrates through the front end of the inner housing. The outer housing covers the outside of the inner housing. The front end between the inner housing and the outer housing is tightly assembled. The door body assembly is arranged at the front end of the baking part; The electric control part includes an upper housing and a control panel. The front end and the lower end of the upper housing are open and are arranged at the upper end of the outer housing, so that an electric control cavity is formed between the inner side of the upper housing and the upper side of the outer housing. The control panel is arranged at the front end of the upper housing and has a preset distance from the outer housing. The outlet of the cooling air duct is located between the control panel and the outer housing.

8. The steam oven anti-condensation control system according to claim 1, characterized in that: The cooling air duct is in a shape that expands from the rear to the front, and there is an angle of 5 - 10 degrees between the middle part and the side part.

9. The steam oven anti-condensation control system according to claim 1, wherein: The temperature switch is a snap-action normally open thermostat.

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