A return air hood and an oven

Abstract

This utility model relates to the technical field of battery manufacturing equipment, and particularly to a return air hood and an oven. The key technical points include a hood body having a first side end extending into the oven and a second side end away from the oven. The hood body is provided with: an outlet located at the end face of the second side end; and an inlet located on the side of the hood body adjacent to the outlet. Airflow enters the hood body through the inlet and flows out through the outlet. One side of the inlet is close to the first side end of the hood body, and the other side of the inlet extends towards the second side end of the hood body. The width of the inlet gradually decreases from the side close to the first side end to the side close to the second side end. This application solves the problem of insufficient return air uniformity in the return air hood.

Description

Technical Field

[0001] This utility model relates to the technical field of battery manufacturing equipment, and in particular to a return air hood and an oven. Background Technology

[0002] Oven equipment is a crucial piece of equipment in the production process of new energy batteries. Its core function is to remove moisture and solvents from the battery electrodes to ensure the cleanliness and electrochemical performance of the battery. However, methylpyrrolidone (NMP) contaminants are generated in the oven during the baking process. Therefore, a closed oven is usually required to remove harmful gases.

[0003] The return air hood, as an important component of the oven, plays a role in collecting harmful gases inside the oven. Typically, the return air hood has an inlet and an outlet, extending into the front chamber of the oven. The inlet of the return air hood is connected to the interior of the front chamber. At this time, the airflow inside the oven can converge from the inlet to the outlet of the return air hood and enter the rear chamber of the oven. Some of the gas is discharged through the exhaust port, and the other part enters the circulating fan through the circulating air inlet, realizing the removal and recycling of gas.

[0004] However, the current return air hood still has many shortcomings. For example, the existing return air hood has the problem of insufficient return air uniformity, which will cause harmful substances to accumulate inside the return air hood and prevent them from being discharged in time.

[0005] Therefore, improvements to existing technologies are necessary.

[0006] The above information is provided as background information only to aid in understanding this disclosure and does not constitute an assertion or admission that any of the above content can be used as prior art relative to this disclosure. Utility Model Content

[0007] This invention provides a return air hood and an oven to solve the problem of insufficient uniformity of return air in the existing technology.

[0008] To achieve the above objectives, firstly, this utility model provides a return air hood with the following technical solution:

[0009] A return air hood includes a hood body having a first side end extending into an oven and a second side end facing away from the oven, and the hood body is provided with:

[0010] The outlet is located at the end face of the second side end;

[0011] And an inlet, located on the side of the hood adjacent to the outlet, through which airflow enters the hood and exits from the outlet, with one side of the inlet close to the first side end of the hood and the other side of the inlet extending toward the second side end of the hood;

[0012] The width of the entrance gradually decreases from the side closer to the first side to the side closer to the second side.

[0013] Preferably, the inlet is disposed through the bottom wall of the cover;

[0014] And / or, the entrance is provided through the horizontal sidewall of the enclosure.

[0015] Preferably, when the bottom wall and horizontal sidewall of the cover are respectively provided with entrances, the area of ​​the entrance located on the bottom wall of the cover is larger than the area of ​​the entrance located on the horizontal sidewall of the cover.

[0016] Preferably, the opening profile of the entrance is a right-angled trapezoidal profile, and the two opposite bottom edges of the entrance are close to the first side end and the second side end, respectively. The opening width of the bottom edge close to the first side end is W1, and the opening width of the bottom edge close to the second side end is W2, where W1 > W2.

[0017] Preferably, the cover is provided with an air duct, which is connected to the inlet and the outlet respectively. The width of the cover gradually increases from the first side end to the second side end, so that the cross-sectional area of ​​the air duct gradually expands from the first side end to the second side end.

[0018] Preferably, the outer edge of the cover is a right-angled trapezoid, the cover has a short bottom edge and a long bottom edge, the short bottom edge of the cover is located at the first side end, and the long bottom edge of the cover is located at the second side end.

[0019] Preferably, the right-angled side and the bottom wall of the cover are respectively provided with inlets, and when the cover is assembled in the oven, the right-angled side of the cover faces away from the horizontal airflow direction inside the oven.

[0020] Preferably, the height of the second side end of the cover is flush with the plane where the entrance is located.

[0021] Preferably, the length of the inlet is greater than the width of the hull inside the oven.

[0022] Secondly, this utility model provides an oven with the following technical solution:

[0023] An oven, including the return air hood described above.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The return air hood and oven provided by this utility model, by setting the inlet to a tapered profile, can more evenly guide the lateral airflow into the return air hood compared to the conventional rectangular inlet structure, making the lateral airflow distribution of the return air hood more uniform and effectively solving the problem of insufficient return air uniformity.

[0026] This invention has other features and advantages that will be apparent from or will be set forth in detail in the accompanying drawings and the following detailed description, which together serve to explain the particular principles of this invention. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of a return air hood in conventional technology;

[0029] Figure 2 This is a schematic diagram of the structure when the return air hood is installed in the oven in conventional technology;

[0030] Figure 3 This is a schematic diagram of the structure of one of the return air hoods provided in Embodiment 1 of this utility model;

[0031] Figure 4 This is a schematic diagram of another return air hood provided in Embodiment 1 of this utility model;

[0032] Figure 5 This is a schematic diagram of the structure of the return air hood installed on the oven in one of the embodiments of the present utility model;

[0033] Figure 6 This is a schematic diagram of the structure of the return air hood installed on the oven in another way according to Embodiment 1 of this utility model.

[0034] Figure label:

[0035] 100. Oven; 1. Cover; 11. First side end; 12. Second side end; 2. Outlet; 3. Inlet.

[0036] W1 is the opening width of the entrance near the first side end;

[0037] W2 is the opening width of the entrance near the second side end. Detailed Implementation

[0038] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0039] In the description of this utility model, it should be understood that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component that is centrally positioned therein. When a component is considered to be "set" on another component, it can be directly set on the other component or there may be a component that is centrally positioned therein.

[0040] Furthermore, terms such as "long," "short," "inner," and "outer" indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings. They are used only for the convenience of describing this utility model and do not indicate or imply that the device or component referred to must have this specific orientation or operate in a specific orientational configuration. Therefore, they should not be construed as limitations of this utility model.

[0041] Reference Figure 1 The diagram illustrates a conventional return air hood structure, which includes a hood body 1, an outlet 2 at one end of the hood body 1, and an inlet 3 at the side adjacent to the outlet 2. The inlet 3 has a rectangular outline.

[0042] Combination Figure 2 This shows a schematic diagram of the structure when a conventional return air hood is installed in oven 100. Figure 2 As can be seen, the return air hood is usually installed at the tail end or downstream area of ​​the oven 100. The oven 100 has a hull, which is equivalent to a conveyor line for straight material transport. The return air hood is located above the hull. At this time, there is a transverse airflow in the oven 100. The airflow direction is along the length of the oven 100 from upstream to downstream (the solid arrow path in the figure), and finally reaches the return air hood area. At this time, the return air hood is set horizontally, and one end of the return air hood extends into the oven 100, while the other end moves away from the oven 100 in a direction perpendicular to the transverse airflow. The transverse airflow enters the hood 1 through the inlet 3, makes a vertical turn, and finally flows out from the outlet 2.

[0043] However, in the above scheme, the rectangular inlet 3 has a large area, resulting in a small effective area for collecting air, which in turn causes uneven lateral return air. Therefore, this technical obstacle needs to be overcome.

[0044] The following is in conjunction with the appendix Figure 3-6 The technical solution of this utility model will be further illustrated through specific implementation methods.

[0045] Example 1:

[0046] Please refer to Figure 3 This utility model provides a return air hood, including a hood body 1. The hood body 1 has a first side end 11 extending into an oven 100 and a second side end 12 facing away from the oven 100. The hood body 1 is provided with an outlet 2 and an inlet 3. The outlet 2 is located at the end face of the second side end 12, and the inlet 3 is located on the side of the hood body 1 adjacent to the outlet 2. Airflow enters the hood body 1 through the inlet 3 and flows out through the outlet 2. One side of the inlet 3 is close to the first side end 11 of the hood body 1, and the other side of the inlet 3 extends toward the second side end 12 of the hood body 1. The width of the inlet 3 gradually decreases from the side close to the first side end 11 to the side close to the second side end 12.

[0047] In some embodiments, the cover 1 is made of sheet metal and has three dimensions: length, width, and height. This embodiment is described with the cover 1 in an installed state. The cover 1 is set in the oven 100, and is hollow and horizontally arranged inside. The first side end 11 of the cover 1 extends to the top of the hull inside the oven 100. At this time, the length direction of the cover 1 is perpendicular to the horizontal airflow. This end is defined as the first side end 11 of the cover 1. At the same time, the other end of the cover 1 in the length direction extends outside the oven 100. This end is defined as the second side end 12 of the cover 1. In addition, the direction on the cover 1 that is consistent with the horizontal airflow is the width direction of the cover 1, and the vertical direction is the height direction of the cover 1.

[0048] Based on this, by gradually narrowing the width of the inlet 3 from the side closer to the first side 11 to the side closer to the second side 12, the opening of the inlet 3 on the side closer to the outlet 2 is shorter in the width direction, while the opening on the side farther from the outlet 2 is larger in the width direction, thus effectively reducing the ineffective area of ​​the inlet 3.

[0049] The return air hood provided in this application embodiment, compared with the conventional rectangular inlet 3 scheme, can make the lateral air volume more evenly distributed in the hood 1 by changing the shape of the inlet 3, thus significantly improving the uniformity of the return air.

[0050] In some embodiments, continue to refer to Figure 3 The inlet 3 is provided through the bottom wall of the cover 1; and / or the inlet 3 is provided through the horizontal side wall of the cover 1.

[0051] It is understandable that the bottom wall of the cover 1 is the side wall of the cover 1 located at the bottom in the height direction. Here, it needs to be explained that... Figure 3 The view shown for cover 1 is the perspective after it has been rotated 180 degrees upwards and horizontally from its normal state. Figure 3 The entrance 3, located at the top, is actually situated at the bottom wall of the enclosure 1. Furthermore, the horizontal sidewall of the enclosure 1 can be understood as one sidewall in the width direction of the enclosure 1. Based on this, the entrance 3 has the following three specific configuration methods:

[0052] In the first method, the inlet 3 is installed through the bottom wall of the cover 1. The horizontal airflow is drawn into the cover 1 from the bottom wall of the cover 1 through the inlet 3, thus achieving the effect of the cover 1 collecting the airflow.

[0053] In the second method, the inlet 3 is installed through the horizontal side wall of the cover 1. The lateral airflow can be drawn into the cover 1 from one side of the cover 1 in the horizontal direction through the inlet 3, thus achieving the same effect of collecting the airflow.

[0054] In the third method, the inlet 3 is respectively installed through the bottom wall of the cover 1 and the horizontal side wall of the cover 1. At this time, the airflow can be drawn into the interior of the cover 1 from the bottom wall of the cover 1 and the horizontal side of the cover 1 respectively. Compared with the first two methods, the third method has a larger effective intake area. In addition, it can also allow the lateral airflow to enter the cover 1 from multiple directions. The resistance experienced by the cover 1 is smaller, and the return air efficiency is significantly optimized and improved.

[0055] In practical applications, regardless of where the inlet 3 is located in the enclosure 1, as long as it allows airflow to enter the enclosure 1, it should be included in the scope of this solution. No restrictions are placed on the specific starting position of the inlet 3.

[0056] Furthermore, continue to refer to Figure 3 In some embodiments, when the bottom wall and the horizontal side wall of the cover 1 are respectively provided with inlets 3, the area of ​​the inlet 3 located on the bottom wall of the cover 1 is larger than the area of ​​the inlet 3 located on the horizontal side wall of the cover 1.

[0057] Based on the above settings, the cover 1 can be configured with a flat outline, thereby compressing the internal height of the cover 1, which can better guide the airflow in a directional manner to prevent turbulence from occurring inside the cover 1.

[0058] In some embodiments, continue to refer to Figure 3 The opening profile of entrance 3 is a right trapezoidal profile. The two opposite bottom edges of entrance 3 are close to the first side end 11 and the second side end 12, respectively. The opening width of the bottom edge close to the first side end 11 is W1, and the opening width of the bottom edge close to the second side end 12 is W2, where W1 > W2.

[0059] Based on the above technical solution, by setting the opening profile of the inlet 3 to a right trapezoid, on the one hand, the inlet 3 can form an opening profile that gradually narrows from the first side end 11 to the second side end 12, thereby achieving a uniform air return effect. On the other hand, the right trapezoidal profile can also effectively reduce the air resistance at the inlet 3, thereby improving the air collection efficiency.

[0060] In other embodiments, the opening profile of the inlet 3 can also be a right triangle, which can also achieve the effect of optimizing the uniformity of return air. It is understood that no matter what specific profile the inlet 3 adopts, as long as the scheme of setting the inlet 3 as an opening profile that gradually narrows from the first side end 11 to the second side end 12 of the cover body 1 is used, it should be included in the interpretation of the equivalent means of this application.

[0061] In some embodiments, refer to Figure 4 The cover 1 has an air duct inside, which is connected to the inlet 3 and the outlet 2 respectively. The width of the cover 1 gradually increases from the first side end 11 to the second side end 12, so that the cross-sectional area of ​​the air duct gradually expands from the first side end 11 to the second side end 12.

[0062] Specifically, the cover 1 is made of sheet metal, so the inner cavity of the cover 1 forms the air duct mentioned above. The air duct is connected to the inlet 3 and the outlet 2 respectively. The airflow enters the air duct from the inlet 3 and flows out from the outlet 2 through the air duct. The gas achieves directional flow in the cover 1. Furthermore, the contour shape of the air duct itself can also affect the flow effect of the gas.

[0063] Based on this, by gradually increasing the width of the cover 1 from the first side end 11 to the second side end 12, the width of the air duct can also gradually increase from the first side end 11 to the second side end 12, thereby gradually expanding the cross-sectional area of ​​the air duct from the first side end 11 to the second side end 12. It should be explained that the cross-sectional area referred to here can be understood as the projected area of ​​the air duct on the cover 1 and on a vertical reference plane parallel to the width direction.

[0064] Based on the above scheme, a gradually expanding air duct structure can be formed, which can reduce the obstruction to the airflow after the airflow is uniformly integrated into the interior of the cover 1, thereby improving the flow efficiency of the airflow. In addition, the amount of material used in the cover 1 can be reduced, and the structural cost is also optimized at the same time.

[0065] In some specific embodiments, reference continues to be made to... Figure 4 The outer edge of the cover 1 is a right trapezoid. The cover 1 has a short bottom edge and a long bottom edge. The short bottom edge of the cover 1 is located at the first side end 11, and the long bottom edge of the cover 1 is located at the second side end 12.

[0066] Based on the above settings, on the one hand, the right-angled trapezoidal shape of the cover 1 can form the gradually expanding air duct structure mentioned above, which greatly improves the airflow efficiency and optimizes the structural cost; on the other hand, the right-angled trapezoidal shape of the cover 1 is relatively easy to process, making it convenient for production and manufacturing.

[0067] In some embodiments, refer to Figure 5 as well as Figure 6 The right-angled side and bottom wall of the cover 1 are respectively provided with inlets 3. When the cover 1 is assembled into the oven 100, the right-angled side of the cover 1 faces away from the horizontal airflow direction inside the oven 100.

[0068] It should be explained that the enclosure 1 has at least two configuration options within the oven 100, as shown in the reference. Figure 5 In one configuration, the inlet 3 is located on the right-angled side, and the inlet 3 located on the right-angled side is positioned opposite to the horizontal airflow, allowing the airflow to enter the enclosure 1 from the inlet 3 on the right-angled side.

[0069] However, simulation experiments revealed a region with a high concentration of NMP near the return air hood, indicating a risk of NMP accumulation in this area. The main reason for this is that when the airflow reaches the tail (or downstream) of the oven 100, due to the width and volume of the hood 1 itself, there will be a gap between the inlet 3 and the tail of the oven 100. Since the inlet 3 is located upstream of this gap, there may be gas that cannot be drawn in from the area near the hood 1, ultimately leading to NMP accumulation.

[0070] In the second setting method, combined with Figure 6 With the right-angled edge of the cover 1 facing away from the direction of the horizontal airflow inside the oven 100, the inlet 3 is positioned opposite to the horizontal airflow. At this time, the inlet 3 faces the tail of the oven 100. Therefore, the airflow accumulated near the cover 1 can flow back from the tail of the oven 100 to the cover 1, making it difficult for NMP to accumulate around the cover 1.

[0071] Based on the above settings, by aligning the right-angled side of the cover 1 with the lateral airflow direction inside the oven 100, the harmful gases accumulating at the tail of the oven 100 and around the cover 1 can be effectively reduced, the return air is more thorough, and the return air effect is significantly improved.

[0072] In some embodiments, refer to Figure 4 and Figure 3 In comparison, the height of the second side end 12 of the cover 1 is flush with the plane where the entrance 3 is located.

[0073] Based on the above settings, the air ducts can maintain a uniform spacing in the vertical direction, which allows the airflow to be guided by the width variation of the air ducts, while reducing the possibility of the airflow shifting vertically inside the enclosure 1, and making the airflow direction more concentrated.

[0074] In some embodiments, the length of inlet 3 is greater than the width of the hull inside oven 100.

[0075] Based on the above settings, by setting the length of inlet 3 to be greater than the width of the hull inside the oven 100, the hood can cover the hull when installed, thereby capturing most of the harmful gases, making it less likely for gases to leak out, and further optimizing and improving the return air effect.

[0076] The return air hood provided in this application has the following beneficial effects:

[0077] 1. By adopting a gradually narrowing inlet 3 structure, the transverse airflow can be guided to flow evenly into the cover 1, reducing airflow resistance at the inlet 3 and improving air collection efficiency.

[0078] 2. By adopting a gradually widening hood profile, it is possible to reduce airflow pressure loss and material costs.

[0079] 3. By facing away from the right-angled side of the cover 1 with the direction of the horizontal airflow, it is possible to reduce the accumulation of harmful substances near the cover 1 and also help to reduce the NMP concentration at the tail of the oven 100.

[0080] Example 2:

[0081] Based on Embodiment 1, features not explained in this embodiment are explained using the methods described in Embodiment 1, and will not be repeated here. This embodiment provides an oven, including the return air hood described in Embodiment 1, and also includes an oven 100. The return air hood is fixedly installed on the side wall of the oven 100, and the first side end 11 extends into the oven 100, while the second side end 12 extends out of the oven 100. At this time, the second side end 12 can be connected to an external pipe, and the external pipe is finally connected to a circulating fan or an exhaust port. Part of the gas is discharged through the exhaust port, and the other part enters the circulating fan through the circulating air port and flows back into the oven 100.

[0082] Based on the above settings, a drying oven 100 solution with uniform and efficient return air was obtained. Furthermore, the drying oven 100 can reduce the accumulation of harmful substances inside and significantly improve the removal rate of harmful gases.

[0083] Therefore, the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A return air hood, characterized in that, Includes a cover (1), the cover (1) having a first side end (11) extending into the oven (100) and a second side end (12) facing away from the oven (100), the cover (1) being provided with: The outlet (2) is located at the end face of the second side end (12); And an inlet (3) is located on the side adjacent to the hood (1) and the outlet (2). Airflow enters the hood (1) through the inlet (3) and flows out from the outlet (2). One side of the inlet (3) is close to the first side end (11) of the hood (1), and the other side of the inlet (3) extends toward the second side end (12) of the hood (1). The width of the entrance (3) gradually decreases from the side closer to the first side end (11) to the side closer to the second side end (12).

2. The return air hood according to claim 1, characterized in that, The entrance (3) is provided through the bottom wall of the cover (1); And / or, the inlet (3) is disposed through the horizontal sidewall of the cover (1).

3. The return air hood according to claim 2, characterized in that, When the bottom wall and the horizontal side wall of the cover (1) are respectively provided with entrances (3), the area of ​​the entrance (3) located on the bottom wall of the cover (1) is greater than the area of ​​the entrance (3) located on the horizontal side wall of the cover (1).

4. The return air hood according to any one of claims 1-3, characterized in that, The opening profile of the entrance (3) is a right-angled trapezoidal profile. The bottom edges of the entrance (3) on opposite sides are close to the first side end (11) and the second side end (12), respectively. The opening width of the bottom edge close to the first side end (11) is W1, and the opening width of the bottom edge close to the second side end (12) is W2, where W1 > W2.

5. The return air hood according to claim 1, characterized in that, The cover (1) is provided with an air duct inside, which is connected to the inlet (3) and the outlet (2) respectively. The width of the cover (1) gradually increases from the first side end (11) to the second side end (12) so that the cross-sectional area of ​​the air duct gradually expands from the first side end (11) to the second side end (12).

6. The return air hood according to claim 5, characterized in that, The outer edge of the cover (1) is a right trapezoid. The cover (1) has a short bottom edge and a long bottom edge. The short bottom edge of the cover (1) is located at the first side end (11), and the long bottom edge of the cover (1) is located at the second side end (12).

7. The return air hood according to claim 5 or 6, characterized in that, The right-angled side and bottom wall of the cover (1) are respectively provided with inlets (3). When the cover (1) is assembled into the oven (100), the right-angled side of the cover (1) faces away from the horizontal airflow direction inside the oven (100).

8. The return air hood according to claim 1, characterized in that, The height of the second side end (12) of the cover (1) is flush with the plane of the entrance (3).

9. The return air hood according to claim 1, characterized in that, The length of the inlet (3) is greater than the width of the hull inside the oven (100).

10. An oven, characterized in that, Includes the return air hood as described in any one of claims 1-9.

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