Air guide hood for oven

Abstract

The present invention relates to an air guide hood for an oven, comprising an air inlet at one end and an air outlet at the other end, a guide channel being formed between the air inlet and the air outlet, the air inlet being used to communicate with the air outlet of a centrifugal fan, the width of the air guide hood increasing from the air inlet to the air outlet, the air guide hood being provided with an air guide auxiliary duct extending from the air inlet to the air outlet at the air inlet end, the air guide auxiliary duct being formed by the hood wall of the air guide hood bulging outwards, and the air guide auxiliary duct being contracted from the air inlet to the air outlet. Compared with the prior art, after the airflow in the present invention is introduced into the air guide auxiliary duct, since the air guide auxiliary duct is contracted from the air inlet to the air outlet, part of the airflow introduced into the air guide auxiliary duct is directed to the other side of the air guide hood or both sides of the air guide auxiliary duct, so that the airflow can be relatively evenly distributed in the rear half of the air guide hood, and evenly flows to the front half of the air guide hood, the air outlet of the air guide hood is even, and a better heat dissipation effect is obtained.

Description

Technical Field

[0001] The invention relates to the field of ovens, and in particular to an air guide cover for an oven. Background Art

[0002] The oven will generate a lot of heat during operation, and in kitchen decoration, the oven is usually embedded in a cabinet or other structure. When the oven is working, its surface temperature will exceed 150°C. If the heat accumulates inside the oven, it will not only accelerate the aging of the oven circuit and electronic components, shorten the service life of the oven, but may even cause the inner tank of the oven to rupture, causing danger.

[0003] Traditional ovens generally dissipate heat for components such as the power board on the top of the oven by setting a cross-flow fan, but the cross-flow fan is noisy and prone to malfunction. For example, the Chinese utility model patent with patent number ZL201120306724.0 (authorization announcement number CN202173286U) discloses an electric oven with a heat dissipation structure, wherein a heat dissipation box is arranged on the top of the box body, the heat dissipation box has an air outlet exposed on the front end surface of the box body, the side wall of the heat dissipation box also has an air inlet for external hot air to enter the heat dissipation box, the top wall of the box body is provided with an air guide port connecting the box body and the heat dissipation box, and the heat dissipation box is also equipped with a heat dissipation fan for discharging the hot air entering the heat dissipation box to the air outlet. The heat dissipation fan adopts a cross-flow fan, and a guide cover is fixed on the top wall of the box body in the above patent, and the guide cover is located between the outlet of the heat dissipation fan and the air outlet of the heat dissipation box. A guide channel connecting the outlet of the heat dissipation fan and the air outlet of the heat dissipation box is formed between the guide cover and the upper surface of the top wall of the box body, and the air guide port is connected to the guide channel. The guide cover in the patent can blow the wind blown out by the heat dissipation fan along the guide channel, thereby taking away the heat. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an air guide hood for an oven with uniform air outlet in view of the prior art.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: an air guide hood for an oven, comprising an air inlet at one end and an air outlet at the other end, a guide channel can be formed between the air inlet and the air outlet, and is characterized in that the air inlet is used to communicate with the air outlet of a centrifugal fan, the width of the air guide hood increases gradually from the air inlet to the air outlet, and the air guide hood is provided with an air guide auxiliary duct extending from the air inlet toward the air outlet at the air inlet end, the air guide auxiliary duct is formed by the hood wall of the air guide hood bulging outwards, and the air guide auxiliary duct is narrowed from the air inlet to the air outlet.

[0006] Furthermore, the auxiliary air guide channel is uniformly narrowed from the air inlet to the air outlet, so that the airflow entering the auxiliary air guide channel can be uniformly flowed to the other side of the guide channel or both sides of the auxiliary air guide channel.

[0007] Furthermore, in order to make the airflow entering from the air inlet more evenly distributed in the air guide cover, the width of the air guide auxiliary channel is close at each place, and the height of the air guide auxiliary channel decreases evenly from the air inlet to the air outlet, so that the airflow can flow evenly to the other side of the air guide cover or both sides of the air guide auxiliary channel.

[0008] In order to enable the airflow to flow better into the air guide auxiliary duct, the trajectory of the air guide auxiliary duct from the air inlet to the air outlet matches the movement trajectory of the intake airflow of the above-mentioned air inlet, so that the airflow can flow smoothly into the air guide auxiliary duct, effectively avoiding turbulence caused by the airflow colliding with the side wall of the air guide auxiliary duct.

[0009] Preferably, the air inlet end is provided with a disc-shaped volute cover, which is used to install an impeller, and the air outlet port of the volute cover is connected to the above-mentioned air inlet end, so that the inner cavity of the volute cover is in communication with the above-mentioned air guide auxiliary duct, thereby enabling the airflow to better enter the air guide auxiliary duct.

[0010] Furthermore, preferably, a circular air inlet port is provided on the cover surface of the volute cover, and the air inlet port is eccentrically arranged with the cover surface of the volute cover and is close to the side where the above-mentioned air guide auxiliary duct is located. Since the impeller of the centrifugal fan is generally arranged concentrically with the air inlet port, when the air inlet port is eccentrically arranged, the impeller is also eccentrically arranged in the volute cover, so that a larger gap can be formed between the impeller and one side of the volute cover, and more air can be accumulated in the gap. When the impeller rotates, the air in the gap can flow out along the tangential direction of the impeller, thereby further increasing the air output of the centrifugal fan assembly.

[0011] One side wall of the auxiliary air guide channel is shared with the guide channel, and the angle between the other side wall and the side wall of the guide channel on the side where the side wall is located is 50° to 55°. Thus, the airflow entering the auxiliary air guide channel can flow more evenly to the other side of the rear half of the guide channel or to both sides of the auxiliary air guide channel, thereby evenly distributing the airflow in the rear half of the guide channel.

[0012] Preferably, the air guide cover is provided with an installation position for installing a power board at the air outlet end. Further, the installation position is provided between the above-mentioned air guide auxiliary duct and the air outlet, and is located in the middle of the air guide cover along the width direction, and is formed by the cover wall of the air guide cover protruding upward, so that the airflow entering from the air guide auxiliary duct is evenly distributed in the rear half of the air guide cover (i.e., the guide channel) and can continue to flow evenly to the front half of the air guide cover (i.e., the guide channel), so as to dissipate heat for the power board installed in the above-mentioned installation position, and then protect it.

[0013] Compared with the prior art, the advantages of the present invention are: the air guide hood in the present invention is provided with an air guide auxiliary channel, and the air guide auxiliary channel is narrowed from the air inlet to the air outlet. In this way, after the airflow is introduced into the air guide auxiliary channel, since the air guide auxiliary channel is narrowed from the air inlet to the air outlet, part of the airflow introduced into the air guide auxiliary channel is guided to the other side of the air guide hood (i.e., the guide channel) or both sides of the air guide auxiliary channel (when the air guide auxiliary channel is set on one side of the air guide hood, the airflow is guided to the other side of the air guide hood; when the air guide auxiliary channel is set in the middle of the air guide hood, the airflow is guided to both sides of the air guide auxiliary channel), thereby enabling the airflow to be relatively evenly distributed in the rear half of the air guide hood (i.e., the guide channel), and evenly flow to the front half of the air guide hood (i.e., the guide channel), so that the airflow of the air guide hood is even, and a better heat dissipation effect is obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a structural schematic diagram of an oven in an embodiment of the present invention;

[0015] Figure 2 A schematic diagram of a partial structure of an oven in an embodiment of the present invention;

[0016] Figure 3 A cross-sectional view of a local structure of an oven in an embodiment of the present invention;

[0017] Figure 4 An exploded view of a local structure of an oven in an embodiment of the present invention;

[0018] Figure 5 It is a structural schematic diagram of a mounting bracket in an embodiment of the present invention;

[0019] Figure 6 It is a schematic diagram of the structure of the volute cover and the air guide cover in an embodiment of the present invention;

[0020] Figure 7 for Figure 6 A schematic diagram of the structure in another direction;

[0021] Figure 8 for Figure 6 A schematic diagram of the structure in yet another direction;

[0022] Fig. 9 for Figure 6 Cross-sectional view along AA direction;

[0023] Fig.10 This is the air field simulation diagram when no wind guide auxiliary duct is set;

[0024] Fig.11 This is a gas field simulation diagram in an embodiment of the present invention. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below with reference to the accompanying drawings.

[0026] like Figures 1 to 9 As shown, an oven is provided with an upper mounting plate 11 on the top of the box body 1, and a heat dissipation structure 2 is provided on the upper mounting plate 11 for dissipating heat from the power board and other devices on the top of the oven. The heat dissipation structure 2 includes an air guide cover 3 and a centrifugal fan assembly 4. The air guide cover 3 is provided on the upper mounting plate 11, one end of which is an air inlet 31 and the other end is an air outlet 32, and a guide channel 30 for air flow to pass through is formed between the air inlet 31 and the air outlet 32. The centrifugal fan assembly 4 is provided at the air inlet 31, and the air outlet port 412 of the centrifugal fan assembly 4 is communicated with the air inlet 31. The centrifugal fan is used to provide a wind source for the guide channel 30. Compared with the existing cross-flow fan, the centrifugal fan has low noise, is not prone to failure, has a long service life, and can provide users with a good use experience. In addition, the air intake is also large, and a good heat dissipation effect can be obtained.

[0027] The centrifugal fan assembly 4 can be a common centrifugal fan. In this embodiment, the centrifugal fan assembly 4 includes a volute cover 41, an impeller 42, a motor 43 and a mounting bracket 44. The volute cover 41 is disc-shaped and is covered on the upper mounting plate 11. The impeller 42 is eccentrically arranged in the inner cavity of the volute cover 41 (such as Figure 6 The top surface of the volute cover 41 is provided with an air inlet port 411, which is circular and concentrically arranged with the impeller 42, so as to provide a wind source for the impeller 42, that is, the air inlet port 411 is also eccentrically arranged on the top surface of the volute cover 41. The side surface of the volute cover 41 is tangentially provided with the air outlet port 412, which is connected with the larger gap of the volute cover 41, so that the centrifugal airflow generated by the rotation of the impeller 42 can be smoothly guided out from the air outlet port 412 and enter the air guide cover 3, and the eccentric arrangement of the impeller 42 can accumulate more air in the larger gap of the volute cover 41, so that more airflow can enter the air guide cover 3, effectively increasing the air intake of the air guide cover 3, and thus obtaining a better heat dissipation effect.

[0028] In this embodiment, the width of the air guide cover 3 increases from the air inlet 31 to the air outlet 32, while the height increases and decreases from the air inlet 31 to the air outlet 32, that is, the airflow slowly decelerates after entering the guide channel 30, and then is guided out from the air outlet 32. Since the air flows out from the air outlet port 412 along the tangent direction of the impeller 42, if the airflow is not guided, most of the air will flow on one side of the air guide cover 3 after passing through the air inlet 31, while less on the other side, thereby failing to achieve the effect of uniform heat dissipation. In order to make the airflow entering from the air inlet 31 relatively evenly distributed in the rear half 36 of the air guide cover 3 (i.e., the guide channel 30), the front and rear directions of the air guide cover 5 in this embodiment are based on the operator, the same below. In this embodiment, the air guide hood 3 is provided with an air guide auxiliary duct 33 extending from the air inlet 31 toward the air outlet 32 ​​at the end of the air inlet 31. The air guide auxiliary duct 33 is formed by the upward bulging of the hood wall of the air guide hood 3, and the air guide auxiliary duct 33 is narrowed from the air inlet 31 to the air outlet 32. In this way, after the airflow out of the air outlet port 412 is introduced into the air guide auxiliary duct 33, since the air guide auxiliary duct 33 shrinks from the air inlet 31 to the air outlet 32, part of the airflow introduced into the air guide auxiliary duct 33 is guided to the other side of the air guide cover 3 or both sides of the air guide auxiliary duct 33 (when the air guide auxiliary duct 33 is set on one side of the air guide cover, the airflow is guided to the other side of the air guide cover 3; when the air guide auxiliary duct 33 is set in the middle of the air guide cover, the airflow is guided to both sides of the air guide auxiliary duct 33), so that the airflow can be relatively evenly distributed in the rear half 36 of the air guide cover 3, and evenly flow to the front half 35 of the air guide cover 3, so as to obtain a better heat dissipation effect. Figure 6 As indicated by the arrow.

[0029] The purpose of setting an air guide hood in the oven is to make the air outlet at the front end of the oven more uniform through the air guide hood, thereby taking away the heat on the mounting plate on the oven and playing a role in cooling the oven. Fig.10 The above-mentioned air guide auxiliary duct 33 is not provided in the air guide cover, and it can be seen that the air outlet uniformity is poor, and most of the air volume is concentrated on one side of the air guide cover, while less on the other side. Fig.11 This is a simulation diagram after the above-mentioned air guide auxiliary duct is provided in this embodiment, Fig.11 It can be seen that the provision of the above-mentioned air guide auxiliary duct 33 greatly improves the uniformity of the air outlet. It can be seen that the above-mentioned air guide auxiliary duct 33 has a good flow guiding effect, so that the air outlet uniformity of the air guide cover 3 is good.

[0030] In order to make the airflow entering from the air inlet 31 more evenly distributed in the guide channel 3, the auxiliary air guide channel 33 is uniformly narrowed from the air inlet 31 to the air outlet 32. Furthermore, the width of each part of the auxiliary air guide channel 33 is close, and the height of the auxiliary air guide channel 33 is uniformly reduced from the air inlet 31 to the air outlet 32, so that the airflow can flow evenly to the other side of the air guide cover 3 or both sides of the auxiliary air guide channel 33. The air flows out from the air outlet port 412 along the tangent direction of the impeller 42. In order to make the airflow flow into the auxiliary air guide channel 33 better, the extension trajectory of the auxiliary air guide channel 33 from the air inlet 31 to the air outlet 32 ​​matches the movement trajectory of the intake airflow of the air inlet 31, so that the airflow can flow smoothly into the auxiliary air guide channel 33, and effectively avoid the airflow from colliding with the side wall of the auxiliary air guide channel 33 to cause turbulence.

[0031] In order to allow the airflow in the volute cover 41 to better enter the air guide cover 3, preferably, the outlet of the volute cover 41 (i.e., the above-mentioned air outlet port 412) is connected to the above-mentioned air inlet 31 end. Furthermore, in this embodiment, the volute cover 41 and the air guide cover 3 are an integral part, and the air outlet port 412 of the volute cover 41 is superimposed on the air inlet 31 of the air guide cover 3 to form an integral structure. In addition, a smooth transition is formed at the critical point between the top surface of the volute cover 41 and the top surface of the air guide auxiliary duct 33, that is, the overlapping part of the above-mentioned air outlet port 412 and the air inlet 31 is smooth. In addition, in the present application, the first side wall 361 of the rear half 36 of the air guide cover 3 is shared with the above-mentioned air guide auxiliary duct 33, that is, the air guide auxiliary duct 33 is arranged on one side of the air guide cover 3, and the angle α between the second side wall 362 of the rear half 36 and the side wall of the air guide auxiliary duct 33 opposite to the second side wall 362 is 53°. Thus, the airflow entering the auxiliary air guide channel 33 can be more evenly diffused to the other side of the rear half 36 of the guide channel 30, and the airflow can be evenly distributed in the rear half 36 of the guide channel 30. In addition, the angle β between the air outlet 32 ​​of the volute cover 41 and the side wall adjacent to the second side wall 342 and the second side wall 342 is 42°.

[0032] Furthermore, the wind guide cover 3 is provided with a mounting position 34 for mounting a power board at the end of the air outlet 32. Specifically, the mounting position 34 is provided between the wind guide auxiliary duct 33 and the air outlet 32, and is located in the middle of the wind guide cover 3 along the width direction, and is formed by the upward protrusion of the cover wall of the wind guide cover 3. In this way, the airflow entering from the wind guide auxiliary duct 33 is evenly distributed in the rear half 36 of the wind guide cover 3, and can continue to evenly flow to the front half 35 of the wind guide cover 3, so as to dissipate heat for the power board installed in the mounting position 34, and then protect it.

[0033] The mounting bracket 44 is mounted on the air inlet port 411, and the motor 43 is mounted on the mounting bracket 44. Specifically, the mounting bracket 44 is a plate, which includes a central tray 441 for mounting the motor 43 and a support arm 442, the support arm 442 is formed by horizontally extending outward from the side edge of the central tray 441, and the support arms 442 are at least two and are spaced apart along the circumference of the central tray 441. In the installed state, the central tray 441 is located at the center of the air inlet port 411, and the free ends of the support arms 442 are respectively located at corresponding positions on the top surface of the volute cover 41. In order to make the mounting bracket 44 structure stable, a reinforcing flange 443 extending upward is formed on the outer edge of the mounting bracket 44. In this embodiment, the shape of the above-mentioned center tray 441 is circular, and there are three support arms 442. The angle between adjacent support arms 442 is 120°. Each support arm 442 is fixed to the top surface of the volute cover 41 by a screw (not shown). Since the above-mentioned air inlet port 411 is eccentrically opened on the top surface of the volute cover 41, a break is formed at the free end of one of the support arms 442, so that the support arm 442 can be prevented from protruding out of the volute cover 41 and affecting the installation. A mounting hole 444 for passing the rotating shaft of the motor 43 is opened at the center of the above-mentioned center tray 441. The provision of the mounting bracket 44 not only facilitates the installation of the motor 43, but also facilitates the connection between the electrical connector of the motor 43 and the power board, so that the structure of the mounting plate 11 on the oven is simple, and the assembly of the oven is stronger.

Claims

1. An air guide hood for an oven, comprising an air inlet (31) at one end and an air outlet (32) at the other end, wherein a guide channel (30) can be formed between the air inlet (31) and the air outlet (32), characterized in that: The air inlet (31) is used to communicate with the air outlet port (412) of the centrifugal fan. The width of the air guide cover (3) increases from the air inlet (31) to the air outlet (32). The air guide cover (3) is provided with an air guide auxiliary duct (33) extending from the air inlet (31) to the air outlet (32) at the end of the air inlet (31). The air guide auxiliary duct (33) is formed by the outward protrusion of the cover wall of the air guide cover (3), and the air guide auxiliary duct (33) is narrowed from the air inlet (31) to the air outlet (32). The auxiliary air guide channel (33) is uniformly narrowed from the air inlet (31) toward the air outlet (32); The width of the air guide auxiliary channel (33) is similar at all locations, and the height of the air guide auxiliary channel (33) decreases uniformly from the air inlet (31) to the air outlet (32); The extension trajectory of the auxiliary air guide channel (33) from the air inlet (31) to the air outlet (32) matches the movement trajectory of the intake air flow of the air inlet (31); One side wall of the auxiliary air guide channel (33) is shared with the guide channel (30), and the angle between the other side wall and the side wall of the guide channel (30) on the side where the side wall is located is 50° to 55°; The air guide cover (3) is provided with a mounting position (34) for mounting a power board at the air outlet (32) end.

2. The air guide cover according to claim 1, characterized in that: The air inlet (31) end is provided with a disc-shaped volute cover (41), the volute cover (41) is used to install the impeller (42), and the air outlet port (412) of the volute cover (41) is connected to the air inlet (31) end, so that the inner cavity of the volute cover (41) is in communication with the air guide auxiliary duct (33).

3. The air guide cover according to claim 2, characterized in that: A circular air inlet port (411) is provided on the top surface of the volute cover (41), and the air inlet port (411) is eccentrically arranged with respect to the top surface of the volute cover (41) and is close to the side where the air guide auxiliary duct (33) is located.

4. The air guide cover according to claim 2, characterized in that: A smooth transition is formed at the boundary between the top surface of the volute cover (41) and the top surface of the auxiliary air guide passage (33).

5. The air guide cover according to claim 1, characterized in that: The installation position (34) is arranged between the above-mentioned air guide auxiliary duct (33) and the air outlet (32), and the installation position (34) is located in the middle of the air guide cover (3) along the width direction and is formed by the cover wall of the air guide cover (3) protruding upwards.

Images