Oven ventilation system

Abstract

The present invention relates to an oven ventilation system, comprising an inner tank and a mounting plate arranged above the inner tank, a first ventilation hole for hot air to pass through is provided on the top wall of the inner tank, and correspondingly, a second ventilation hole is provided on the mounting plate, and the system also comprises a ventilation pipe assembly, an air guide and a fan. The present invention increases the pressure of the heated air in the oven inner tank through the ventilation pipe assembly and always maintains a relatively constant pressure, thereby avoiding the natural output of a large amount of hot air, improving the heat utilization rate, and thus improving the cooking efficiency; at the same time, part of the hot air output by the ventilation pipe assembly is mixed with the external cold air in the first air guide channel and then output through the second air guide channel, which can play a cooling effect on the oven control circuit board installed above the second air guide channel, but because the thermal resistance is increased in this process, to achieve the same cooling effect, the required air volume of the fan is reduced, and the power requirement of the fan is also reduced accordingly, which not only reduces the fan noise, but also saves energy consumption.

Description

Technical Field

[0001] The invention relates to a ventilation system for an oven. Background Art

[0002] Currently, high-end ovens on the market generally have a vent above the oven inner tank, and a vent pipe is used to connect the inner tank with the air guide plate to achieve a balance between pressure and humidity in the oven inner tank.

[0003] For example, the Chinese patent application "An Oven Inner Tank Structure" (application number: 201610604898.2) with application publication number CN106063680A discloses a structure, which includes an inner tank shell for enclosing a baking cavity, a heater arranged in the inner tank shell, and a left baffle, a right baffle, and a rear baffle are respectively provided on the left side, right side, and rear side of the inner wall of the inner tank shell, and there is a gap between the middle part of the left baffle, the right baffle, and the rear baffle and the inner wall of the inner tank shell. The left baffle, the right baffle, and the rear baffle are arranged tightly against the inner wall of the inner tank shell on all sides, and a first hot air blower, a second hot air blower, and a third hot air blower are respectively provided between the left baffle, the right baffle, the rear baffle and the inner wall of the inner tank shell; air inlets are provided in the middle part of the left baffle, the right baffle, and the rear baffle, and air outlets are provided on the left and right sides of the left baffle, the right baffle, and the rear baffle.

[0004] The above-mentioned existing oven vents are generally opened in the middle of the upper mounting plate, and the vent duct is a straight cylindrical tube with a relatively simple structure. The vent duct discharges the hot air expanded in the oven out of the inner tank, and uses a cross-flow fan and a single cold air channel to discharge the hot air to the outside, thereby taking away the excess heat of the oven and reducing the temperature of the upper control circuit board.

[0005] Because the larger the air mass in the cooking cavity, the higher the heat flux density, the higher the energy utilization rate, and the higher the energy efficiency when cooking food, the air will inevitably expand due to heat during the cooking process. Therefore, a large amount of hot air will be discharged from the air vent, which will not only cause heat loss and affect cooking efficiency, but also require a larger air volume, resulting in a larger noise generated by the cross-flow fan. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide an oven ventilation system which improves heat utilization and cooking efficiency, reduces noise and saves energy by setting a pressurized baking structure in view of the current status of the prior art.

[0007] The technical solution adopted by the present invention to solve the above technical problems is: an oven ventilation system, comprising an inner container and a mounting plate arranged above the inner container, wherein a first air hole for hot air to pass through is opened on the top wall of the inner container, and correspondingly, a second air hole is opened on the mounting plate, characterized in that: it also includes

[0008] A ventilation tube assembly, used to keep the pressure in the inner tank relatively constant, wherein the first end of the ventilation tube assembly is connected to the first ventilation hole, and the second end of the ventilation tube assembly is connected to the second ventilation hole;

[0009] An air guide member is disposed above the mounting plate and forms a first air guide channel between the upper surface of the mounting plate, the air guide member is provided with an air inlet for cold air to enter the first air guide channel, and the upper end of the air permeable tube assembly is located in the first air guide channel; a second air guide channel extending toward the front side of the inner tank is formed on the upper portion of the air guide member, and the rear portion of the second air guide channel is connected to the first air guide channel; and

[0010] The fan is arranged at the rear of the first air guiding channel and is used to output the mixed air in the first air guiding channel through the second air guiding channel.

[0011] As an improvement, the first air guide channel has a main body portion formed into a rectangle and an extension portion extending forward from the main body portion, the middle portion of the front edge of the main body portion has an extension opening, the length of the front side of the extension portion is greater than the length of the extension opening but less than the length of the main body portion, and the side walls of the extension portion are symmetrically arranged and formed into an arc-shaped structure that arches outward. With such a structure, after the hot air enters the first air guide channel through the air inlet duct assembly, there is a slow diffusion process, during which the hot air can be fully mixed with the cold air entering the first air guide channel, so as to play a better heat dissipation and cooling role on the control circuit board in the future.

[0012] Preferably, the length of the extension opening is 0.3 to 0.6 times the length of the main body, and the length of the front side of the extension portion is 0.6 to 0.8 times the length of the main body. Tests have shown that such parameters can achieve a better balance between the gathering and diffusion of hot air, which is conducive to the rapid mixing of hot air and cold air.

[0013] Preferably, the lower part of the air guide has a side plate extending downward along the edge, and the upper port of the air permeable tube assembly is arranged close to the front side wall of the side plate and is located in the extended part of the first air guide channel. The height of the side plate forms the height of the first air guide channel, which is conducive to providing sufficient space for the mixing of cold and hot air, and the upper port of the air permeable tube assembly is located in the extended part of the first air guide channel, which is conducive to balancing the gathering and diffusion of hot air, so that the hot air can be dispersed and fully mixed with the cold air entering the first air guide channel before the hot air enters the second air guide channel.

[0014] Preferably, the air inlet is provided on the left side wall and / or the right side wall and / or the rear side wall of the air guide side plate. Further preferably, the left side wall, the right side wall and the rear side wall of the air guide side plate are all provided with air inlets, and this structure allows the cold air to flow in from each side of the first air guide channel, which is conducive to sufficient and rapid mixing with the hot air.

[0015] In the above preferred solutions, the top of the first air guide channel is provided with an air vent connected to the second air guide channel, an annular area is formed between the air inlet end of the second air guide channel and the first air guide channel, the fan is a centrifugal fan arranged in the annular area, and the air vent constitutes the air inlet of the centrifugal fan. Such a structure is conducive to quickly sucking the mixed air in the first air guide channel into the second air guide channel and outputting it from the back to the front, so that the mixed air is conducive to cooling the control circuit board of the oven.

[0016] According to the wind flow direction, the width of the downstream of the second air guide channel gradually increases and the height gradually decreases from the edge of the annular area to the front, and the upper surface of the downstream of the second air guide channel is formed with a mounting area for mounting the oven control circuit board, and the air outlet of the second air guide channel extends to the top edge of the front side of the oven. This structure is conducive to increasing the wind speed, increasing the heat dissipation surface, and enhancing the heat dissipation effect.

[0017] As an improvement, the ventilation tube assembly includes a ventilation tube, a top cover and an elastic member, the ventilation tube is vertically connected, the top cover is movably arranged on the ventilation tube and can cover or open the upper end of the ventilation tube, and the elastic member makes the top cover always keep the tendency of covering the upper end of the ventilation tube. With such a structure, the natural output of the expanded hot air in the oven inner tank is avoided, and a relatively constant pressure is always maintained in the oven inner tank, thereby improving the utilization rate of heat and further improving the cooking efficiency.

[0018] To facilitate installation, the ventilation tube assembly also includes an installation cover, which is detachably arranged on the top of the ventilation tube and forms an installation cavity between the ventilation tube. The top cover can be moved up and down in the installation cavity. The elastic member is arranged between the installation cover and the top cover, and an air outlet for hot air to pass through is opened on the side wall of the installation cover.

[0019] Preferably, the side wall of the installation cover arranged toward the air inlet end of the second air guide channel is provided with the air outlet, and the side walls of the installation cover arranged toward the left and right sides of the first air guide channel are provided with the air outlets respectively. With such an arrangement, the hot air can be quickly mixed with the cold air under the action of the centrifugal fan.

[0020] Compared with the prior art, the advantages of the present invention are: the present invention increases the pressure of the heated air in the oven inner tank and always maintains a relatively constant pressure through the air permeable tube assembly, thereby avoiding the natural output of a large amount of hot air, improving the heat utilization rate, and thus improving the cooking efficiency; at the same time, part of the hot air output by the air permeable tube assembly is mixed with the external cold air in the first air guide channel and then output through the second air guide channel, which can cool the oven control circuit board installed above the second air guide channel, but because the thermal resistance is increased in this process, to achieve the same cooling effect, the required air volume of the fan is reduced, and the power requirement of the fan is also reduced accordingly, which not only reduces the fan noise but also saves energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0022] Figure 2 for Figure 1 A cross-sectional view of

[0023] Figure 3 for Figure 1 Structural schematic diagram of the middle air guide;

[0024] Figure 4 for Figure 3 A schematic diagram of the structure from another angle;

[0025] Figure 5 This is a schematic diagram of the structure of the ventilation pipe assembly in an embodiment of the present invention;

[0026] Figure 6 for Figure 5 sectional view of . DETAILED DESCRIPTION

[0027] The present invention is further described in detail below with reference to the accompanying drawings.

[0028] like Figures 1 to 6 As shown, the oven ventilation system of this embodiment includes an inner tank 1, a mounting plate 2, an air vent assembly 3, an air guide 4 and a fan 5. The mounting plate 2 is arranged above the inner tank 1 and a gap for installing heat insulation cotton is formed between the mounting plate 2 and the inner tank. A first air hole 11 for hot air to pass through is provided on the top wall of the inner tank 1, and correspondingly, a second air hole 21 is provided on the mounting plate 2.

[0029] The air vent assembly 3 of this embodiment is used to keep the pressure in the inner pot 1 relatively constant. The first end of the air vent assembly 3 is connected to the first air hole 11, and the second end of the air vent assembly 3 is connected to the second air hole 21. Specifically, the air vent assembly 3 includes an air vent 31, a top cover 32 and an elastic member 33. The air vent 31 is through-through, and the edge of the lower end of the air vent 31 extends outward to form a sealing sheet 311 that can be embedded in the top wall of the inner pot 1. The top cover 32 can be moved up and down on the air vent 31 and can cover or open the upper end of the air vent 31. The elastic member 33 is a spring, which makes the top cover 32 always keep the upper end of the air vent 31. Such a structure avoids the natural output of the expanded hot air in the oven inner pot 1, and always maintains a relatively constant pressure in the oven inner pot 1, thereby improving the utilization rate of heat and further improving cooking efficiency. To facilitate installation, the air vent assembly 3 also includes a mounting cover 34, which is detachably arranged on the top of the air vent 31 by means of a threaded connection and forms a mounting cavity 30 with the air vent 31. The top cover 32 is movably arranged in the mounting cavity 30, and the two ends of the elastic member 33 are respectively pressed between the lower surface of the mounting cover 34 and the upper surface of the top cover 32. The side wall of the mounting cover 34 is provided with an air outlet 341 for hot air to pass through.

[0030] In this embodiment, the air guide member 4 is disposed above the mounting plate 2 and a first air guide channel 41 is formed between the air guide member 4 and the upper surface of the mounting plate 2. An air inlet 410 is provided on the air guide member 4 for cold air to enter the first air guide channel 41. The upper end of the air permeable tube assembly 3 is located in the first air guide channel 41. A second air guide channel 42 extending toward the front side of the inner liner 1 is formed at the upper portion of the air guide member 4, and the rear portion of the second air guide channel 42 is connected to the first air guide channel 41. The fan 5 is disposed at the rear portion of the first air guide channel 41 and is used to output the mixed air in the first air guide channel 41 through the second air guide channel 42. Specifically, the first air guide channel 41 of the present embodiment has a main body 411 formed into a rectangle and an extension part 412 extending forward from the main body 411, an extension opening 413 is provided in the middle of the front edge of the main body 411, the front side length of the extension part 412 is greater than the length of the extension opening 413 but less than the length of the main body 411, and the side walls of the extension part 412 are symmetrically arranged and formed into an arc structure 4121 that arches outward. After the hot air enters the first air guide channel 41 through the air inlet duct assembly 3, there is a slow diffusion process, in which the hot air can be fully mixed with the cold air entering the first air guide channel 41, so as to play a better heat dissipation and cooling effect on the control circuit board in the future. The length of the extension opening 413 is 0.3 to 0.6 times the length of the main body 411, and the length of the front side of the extension part 412 is 0.6 to 0.8 times the length of the main body 411. It has been verified by experiments that the use of such parameters can achieve a better balance between the gathering and diffusion of hot air, which is conducive to the rapid mixing of hot air and cold air. The lower part of the air guide 4 of this embodiment has a side plate 43 extending downward along the edge, and the upper port of the air vent assembly 3 is arranged near the front side wall of the side plate 43 and is located in the expansion part 412 of the first air guide channel 41. The mounting cover 34 of the air vent assembly 3 is provided with an air outlet 341 on the side wall arranged toward the air inlet end of the second air guide channel 42, and the mounting cover 34 is provided with an air outlet 341 on the side wall arranged toward the arc structure 4121 on the left and right sides of the first air guide channel 41, so that the hot air can be quickly mixed with the cold air under the action of the centrifugal fan 5. The height of the side plate 43 forms the height of the first air guide channel 41, which is conducive to providing sufficient space for the mixing of cold and hot air. The upper port of the air permeable tube assembly 3 is located in the expansion part 412 of the first air guide channel 41, which is conducive to balancing the gathering and diffusion of hot air, so that the hot air can be dispersed and fully mixed with the cold air entering the first air guide channel 41 before entering the second air guide channel 42. The left side wall, right side wall and rear side wall of the side plate 43 of the air guide member 4 are all provided with air inlets 410. This structure allows the cold air to flow in from the sides of the first air guide channel, which is conducive to sufficient and rapid mixing with the hot air.

[0031] The top of the first air guide channel 41 of the present embodiment is provided with an air vent 44 connected to the second air guide channel 42. An annular area 45 is formed between the air inlet end of the second air guide channel 42 and the first air guide channel 41. The fan 5 is a centrifugal fan arranged in the annular area 45. The air vent 44 constitutes the air inlet of the centrifugal fan. Such a structure is conducive to quickly sucking the mixed air in the first air guide channel 41 into the second air guide channel 42 and outputting it from the back to the front, so as to facilitate the cooling of the control circuit board of the oven by the mixed air. According to the flow direction of the wind, the width of the downstream of the second air guide channel 42 gradually increases and the height gradually decreases from the edge of the annular area 45 to the front. The upper surface of the downstream of the second air guide channel 42 is formed with an installation area 420 for installing the oven control circuit board. The air outlet 421 of the second air guide channel 42 extends to the top edge of the front side of the oven inner tank 1. This structure is conducive to increasing the wind speed, increasing the heat dissipation surface, and enhancing the heat dissipation effect.

[0032] When the oven ventilation system of the present embodiment is used, when the pressure in the inner tank 1 is greater than the safety value or the set value, the hot air compresses the elastic member 33 to push the top cover 32 upward, and the hot air can enter the first air guide channel 41 from the air outlet 341 of the mounting cover 34. In this process, the air vent assembly 3 increases the pressure of the heated air in the oven inner tank 1 and always maintains a relatively constant pressure, thereby avoiding the natural output of a large amount of hot air, improving the heat utilization rate, and thus improving the cooking efficiency; at the same time, part of the hot air output by the air vent assembly 3 is mixed with the external cold air in the first air guide channel 41 and then output through the second air guide channel 42, which can cool the oven control circuit board installed above the second air guide channel 42. However, since the thermal resistance is increased in this process, the air volume of the fan 5 required to achieve the same cooling effect is reduced, and the power requirement of the fan 5 is also reduced accordingly, which not only reduces the fan noise but also saves energy consumption.

Claims

1. An oven ventilation system, comprising an inner container (1) and a mounting plate (2) disposed above the inner container (1), wherein a first air hole (11) is provided on the top wall of the inner container (1) for hot air to pass through, and correspondingly, a second air hole (21) is provided on the mounting plate (2), characterized in that: Also includes A ventilation tube assembly (3) is used to keep the pressure in the inner liner (1) relatively constant, the first end of the ventilation tube assembly (3) being connected to the first ventilation hole (11), and the second end of the ventilation tube assembly (3) being connected to the second ventilation hole (21); An air guide member (4) is arranged above the mounting plate (2) and forms a first air guide channel (41) between the upper surface of the mounting plate (2); an air inlet (410) is provided on the air guide member (4) for cold air to enter the first air guide channel (41); an upper end of the air permeable tube assembly (3) is located in the first air guide channel (41); a second air guide channel (42) is formed on the upper portion of the air guide member (4) and extends toward the front side of the inner liner (1); a rear portion of the second air guide channel (42) is connected to the first air guide channel (41); and A fan (5) is arranged at the rear of the first air guide channel (41) and is used to output the mixed air in the first air guide channel (41) through the second air guide channel (42); The first air guiding channel (41) comprises a main body portion (411) shaped as a rectangle and an extension portion (412) extending forward from the main body portion (411); an extension opening (413) is provided in the middle of the front edge of the main body portion (411); the length of the front side of the extension portion (412) is greater than the length of the extension opening (413) but less than the length of the main body portion (411); and the side walls of the extension portion (412) are symmetrically arranged and formed into an outwardly arched arc structure (4121); The vent pipe assembly (3) comprises a vent pipe (31), a top cover (32) and an elastic member (33); the vent pipe (31) is connected vertically; the top cover (32) is disposed on the vent pipe (31) in a manner that allows it to move up and down and can cover or open the upper end of the vent pipe (31); the elastic member (33) enables the top cover (32) to always maintain a tendency to cover the upper end of the vent pipe (31); the vent pipe assembly (3) further comprises a mounting cover (34); the mounting cover (34) is detachably disposed on the top of the vent pipe (31) and is disposed between the vent pipe (31). An installation cavity (30) is formed, the top cover (32) is arranged in the installation cavity (30) so as to be movable up and down, the elastic member (33) is arranged between the installation cover (34) and the top cover (32), and an air outlet (341) for hot air to pass through is provided on the side wall of the installation cover (34); the air outlet (341) is provided on the side wall of the installation cover (34) arranged toward the air inlet end of the second air guide channel (42), and the air outlet (341) is respectively provided on the side walls of the installation cover (34) arranged toward the left and right sides of the first air guide channel (41).

2. The oven ventilation system according to claim 1, characterized in that: The length of the extension opening (413) is 0.3 to 0.6 times the length of the main body portion (411), and the length of the front side of the extension portion (412) is 0.6 to 0.8 times the length of the main body portion (411).

3. The oven ventilation system according to claim 1, characterized in that: The lower part of the air guide member (4) has a side plate (43) extending downward along the edge, and the upper port of the air permeable tube assembly (3) is arranged close to the front side wall of the side plate (43) and is located in the extended part (412) of the first air guide channel (41).

4. The oven ventilation system according to claim 1, characterized in that: The air inlet (410) is opened on the left side wall and / or the right side wall and / or the rear side wall of the side plate (43) of the air guide member (4).

5. The oven ventilation system according to any one of claims 1 to 4, characterized in that: The top of the first air guiding channel (41) is provided with an air vent (44) which is connected to the second air guiding channel (42); an annular area (45) is formed between the air inlet end of the second air guiding channel (42) and the first air guiding channel (41); and the fan (5) is a centrifugal fan arranged in the annular area (45).

6. The oven ventilation system according to claim 5, characterized in that: According to the flow direction of wind, the width of the downstream of the second air guide channel (42) gradually increases and the height gradually decreases from the edge of the annular area (45) to the front, and the upper surface of the downstream of the second air guide channel (42) is formed with a mounting area (420) for mounting an oven control circuit board.

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