Drying oven air return pipe structure and lithium battery drying oven

Abstract

The air return pipe structure of the drying oven comprises an air return pipe body, and a plurality of upper air return holes communicated with the interior of the air return pipe body are evenly formed in the upper surface of the air return pipe body. A plurality of side air return holes communicating with the interior of the air return pipe body are evenly formed in the two opposite sides of the air return pipe body, a fresh air inlet communicating with the interior of the air return pipe body is formed in the air return pipe body, the fresh air inlet is used for feeding dry air into the air return pipe body, and an air outlet is formed in the air return pipe body. And air flow in the air return pipe body is exhausted through the air outlet. The drying oven has the advantages of balancing an air flow field and a pressure field in the drying oven and uniformizing a temperature field in the drying oven during air return and fresh air introduction.

Description

Technical Field

[0001] The utility model relates to the technical field of ovens, in particular to an oven return air duct structure and a lithium battery oven. Background Art

[0002] With the rapid development of the lithium battery industry, the demand for the technical level of production equipment is increasing. The production of lithium battery pole pieces involves the coating and drying of the pole pieces. The drying process determines the performance of the lithium battery pole pieces. The drying of lithium battery pole pieces is generally completed in an oven. When the lithium battery pole pieces are moving and drying in the oven, the uniformity of the flow field distribution is the determining factor in the pole piece drying process, which has a key impact on the quality of lithium battery products.

[0003] However, when the existing oven dries the lithium battery pole pieces, the airflow tends to gather between the blowing nozzle and the pole pieces, affecting the uniformity of the flow field distribution inside the oven and directly affecting the performance of the lithium battery pole pieces.

[0004] In view of this, the purpose of the utility model is to provide a new technical solution to solve the existing technical problems. Utility Model Content

[0005] In order to overcome the deficiencies of the prior art, the utility model provides an oven return air duct structure and a lithium battery oven, which solves the problem of uneven air flow field inside the oven during return air and fresh air ventilation.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] A return air duct structure for an oven comprises a return air duct body, a plurality of upper return air holes connected to the interior of the return air duct body are evenly formed on the upper surface of the return air duct body, a plurality of side return air holes connected to the interior of the return air duct body are evenly formed on opposite sides of the return air duct body, a fresh air inlet connected to the interior of the return air duct body is formed on the return air duct body, the fresh air inlet is used to deliver clean gas into the return air duct body, the return air duct body is formed with an air outlet, and the airflow in the return air duct body is discharged through the air outlet.

[0008] In the above structure, an oil guide groove is provided on the return air duct body.

[0009] In the above structure, the oil guide groove includes an inner oil guide groove, which is arranged inside the return air duct body and below the upper return air hole. The inner oil guide groove has inner return air holes connected to the inside of the return air duct body on the opposite side walls.

[0010] In the above structure, the oil guide groove further comprises side oil guide grooves, and the side oil guide grooves are arranged on two opposite sides of the upper surface of the return air duct body.

[0011] In the above structure, the side oil guide groove is in a "V" shape.

[0012] In the above structure, an oil collecting groove for collecting oily impurities flowing out of the inner oil guide groove and the side oil guide groove is provided on one side of the return air duct body.

[0013] In the above structure, the inner oil guide groove and the side oil guide groove are arranged to be inclined toward the oil collecting groove.

[0014] In the above structure, the ventilation area of ​​the return air duct body gradually decreases along the length direction from the air outlet.

[0015] In the above structure, the return air duct body is a wedge-shaped structure.

[0016] In the above structure, an air outlet is provided on the return air duct body, and the airflow of the return air duct body is discharged through the air outlet.

[0017] The utility model also provides:

[0018] A lithium battery oven comprises the oven return air duct structure as described in any one of the above items.

[0019] The beneficial effects of the utility model are:

[0020] (1) A fresh air inlet is opened on the return air duct body. The fresh air transported by the fresh air duct enters the oven through the return air duct body, which is conducive to balancing the air flow field, uniform temperature field, and pressure field in the oven;

[0021] (2) An oil guide trough and an oil collecting trough are set up to collect volatile oily impurities, which is conducive to subsequent unified processing and recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0023] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0024] Figure 2 This is a schematic diagram of the connection relationship between the oil guide groove and the return air duct of the utility model;

[0025] Figure 3 It is a schematic diagram of the position relationship between the oil collecting groove and the oil guiding groove of the utility model.

[0026] Figure numerals: 1. return air duct body; 11. upper return air hole; 12. side return air hole; 13. air outlet; 14. fresh air inlet; 2. oil guide groove; 21. inner oil guide groove; 211. inner return air hole; 22. side oil guide groove; 3. oil collecting groove. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-3 The utility model is further described.

[0028] The following will clearly and completely describe the concept, specific structure and technical effects of the utility model in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the utility model. In addition, all the connection / connection relationships involved in the patent do not refer to the direct connection of components, but refer to the formation of a better connection structure by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the creation of the utility model can be combined interchangeably without conflicting with each other.

[0029] Reference Figures 1 to 3 , an oven return air duct structure, which can be applied to the drying operation of lithium battery pole pieces, and can be installed below the air nozzle in the oven when in use. The oven return air duct structure includes a return air duct body 1, and a plurality of upper return air holes 11 are evenly opened on the upper surface of the return air duct body 1, and the return air holes are connected to the inside of the return air duct body 1; a plurality of side return air holes 12 are evenly opened on the opposite sides of the return air duct body 1, and the side return air holes 12 are connected to the inside of the return air duct body 1; a fresh air inlet 14 is also opened on one side of the return air duct body 1, and the fresh air inlet 14 is connected to the inside of the return air duct body 1, and the fresh air inlet 14 is connected to the external fresh air duct, and is used to send clean gas into the return air duct body 1. An air outlet 13 is opened at one end of the return air duct body 1, and the airflow of the return air duct body 1 is discharged through the air outlet 13.

[0030] In this embodiment, the return air duct body 1 is a wedge-shaped structure, that is, the ventilation area of ​​the return air duct body 1 gradually decreases along the length direction from the air outlet 13, that is, the ventilation area of ​​the return air duct body 1 decreases as it is farther from the air outlet 13. When in use, the return air duct body 1 is often used in conjunction with a return air fan, which is arranged at the air outlet 13. However, as the distance from the air outlet 13 increases, the wind force gradually decreases, and setting the return air duct body 1 in a wedge-shaped structure is conducive to ensuring the wind force in the return air duct body 1 at a distance from the air outlet 13, so as to improve the uniformity of the return air.

[0031] Compared with the existing structure of setting a single return air outlet, this embodiment evenly opens a plurality of upper return air holes 11 and side return air holes 12 on the return air duct body 1, so that the return air structure is dispersed to various parts of the return air duct body 1, thereby effectively improving the uniformity of the return air and effectively reducing the possibility of forming an uneven airflow field due to a large flow at the return air outlet and a small flow far away from the air outlet.

[0032] In actual application, the air outlet 13 of the return air duct body 1 is connected to the return air cavity of the oven, and the fresh air inlet 14 is connected to the fresh air duct, and air is exhausted from the return air duct body 1, so that the interior of the return air duct body 1 is in a negative pressure state, and the air flow blown out from the air nozzle of the oven enters the return air duct body 1 from the upper return air hole 11 and the side return air hole 12, and the fresh air duct transmits clean gas to the return air duct body 1 through the fresh air inlet 14, and the dry gas entering the return air duct body 1 enters the return air cavity from the air outlet 13. When the oven is working for a long time, the air inside the oven will have a lot of volatile impurities, and it is necessary to discharge the air in the oven regularly and provide new clean air through the fresh air duct. However, if the fresh air is directly introduced into the oven, there is a temperature difference between the temperature of the fresh air and the temperature inside the oven, which will disrupt the air flow stability in the oven. By opening a fresh air inlet 14 on the return air duct body 1, the fresh air first passes through the return air duct body 1 and is mixed with the original hot air in the return air duct body 1, and then enters the return air cavity after being heated, which effectively reduces the temperature difference between the fresh air and the inside of the oven, which is beneficial to maintaining the working stability of the oven.

[0033] Reference Figure 2 and Figure 3 The return air duct body 1 is provided with an oil guide groove 2. The airflow out of the oven is usually mixed with oily impurities such as white oil evaporated by the film substrate during drying. The oil guide groove 2 is used to intercept these oily impurities and then recycle them uniformly. In this embodiment, the oil guide groove 2 includes an inner oil guide groove 21. The inner oil guide groove 21 is fixedly arranged inside the return air duct body 1, and the inner oil guide groove 21 is located below the upper return air hole 11. The airflow entering from the upper return air hole 11 all flows through the inner oil guide groove 21. The inner return air holes 211 are evenly opened on the opposite sides of the inner oil guide groove 21. The inner return air holes 211 are connected to the inside of the return air duct body 1. The airflow flowing through the inner oil guide groove 21 enters the return air duct body 1 from the inner return air holes 211. The oil guide groove 2 also includes a side oil guide groove 22, which is fixedly arranged on opposite sides of the upper surface of the return air duct, and the side oil guide groove 22 is located on the side of the side return air hole 12 close to the upper surface of the return air duct body 1. In this embodiment, the side oil guide groove 22 is a "V"-shaped structure, and the airflow may be retained on the upper surface of the return air duct before entering the return air duct body 1 from the upper return air hole 11, so that the oily impurities carried in the airflow are partially attached to the upper surface of the return air duct body 1, and these oily impurities flow into the side oil guide groove 22 for unified recovery and treatment. The extension direction of the side oil guide groove 22 and the inner oil guide groove 21 is consistent with the length direction of the return air duct body 1.

[0034] An oil collecting tank 3 is provided on the side of the return air duct body 1 away from the air outlet 13. The oil collecting tank 3 is used to collect oily impurities discharged from the inner oil guide tank 21 and the side oil guide tank 22. In actual setting, the oil collecting tank 3 can be fixedly installed at the end of the return air duct body 1, or can be movably set at one side of the end of the return air duct, which is not limited here. The inner oil guide tank 21 and the side oil guide tank 22 are inclined toward the oil collecting tank 3, and the inclined setting is conducive to the oily impurities in the oil guide tank 2 flowing to the oil collecting tank 3, so as to facilitate subsequent unified recovery and treatment.

[0035] The implementation principle of the utility model is:

[0036] The oven return air duct structure is installed at the lower part of the oven nozzle. The airflow in the oven enters the return air duct body 1 through the upper return air hole 11. The airflow first passes through the inner oil guide groove 21 located in the return air duct body 1, and then enters the return air duct body 1 through the inner return air holes 211 on both sides of the inner oil guide groove 21. Then the airflow enters the return air cavity in the oven through the return air duct outlet 13. The oily impurities on the membrane substrate enter the oil guide groove 2 with the air flow, and then flow to the outlet of the oil guide groove 2 to be uniformly collected and recycled by the oil collecting tank 3. The external fresh air duct is connected to the fresh air inlet 14 to let in fresh air, and the fresh air enters the return air cavity through the outlet 13 of the return air duct body 1, which reduces the situation where the fresh air causes local temperature unevenness and fluid instability in the oven.

[0037] Based on the above oven return air duct structure, the utility model also provides:

[0038] A lithium battery oven comprises an oven return air duct structure as above.

[0039] The above is a specific description of the preferred implementation of the utility model, but the invention of the utility model is not limited to the described embodiments. Technical personnel familiar with the field can also make various equivalent deformations or substitutions without violating the spirit of the utility model. These equivalent deformations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. An oven return air duct structure, characterized in that: It includes a return air duct body, a plurality of upper return air holes connected to the interior of the return air duct body are evenly formed on the upper surface of the return air duct body, a plurality of side return air holes connected to the interior of the return air duct body are evenly formed on opposite sides of the return air duct body, a fresh air inlet connected to the interior of the return air duct body is formed on the return air duct body, the fresh air inlet is used to deliver dry gas into the return air duct body, the return air duct body is formed with an air outlet, and the airflow in the return air duct body is discharged through the air outlet.

2. The oven return air duct structure according to claim 1, characterized in that: The return air duct body is provided with an oil guide groove.

3. The oven return air duct structure according to claim 2, characterized in that: The oil guide groove comprises an inner oil guide groove, which is arranged inside the return air duct body and below the upper return air hole. The inner oil guide groove has inner return air holes communicating with the inside of the return air duct body on opposite side walls.

4. The oven return air duct structure according to claim 3, characterized in that: The oil guide groove further comprises side oil guide grooves, and the side oil guide grooves are arranged on two opposite sides of the upper surface of the return air duct body.

5. The oven return air duct structure according to claim 4, characterized in that: The side oil guide groove is in a "V"-shaped structure.

6. The oven return air duct structure according to claim 4, characterized in that: An oil collecting groove for collecting oily impurities flowing out of the inner oil guide groove and the side oil guide groove is arranged on one side of the return air duct body.

7. The oven return air duct structure according to claim 6, characterized in that: The inner oil guide groove and the side oil guide groove are arranged inclined toward the oil collecting groove.

8. The oven return air duct structure according to claim 1, characterized in that: The ventilation area of ​​the return air duct body gradually decreases along the length direction from the air outlet.

9. The oven return air duct structure according to claim 1, characterized in that: The return air duct body is in a wedge-shaped structure.

10. A lithium battery oven, characterized in that: The invention comprises the oven return air duct structure as described in any one of claims 1 to 9.

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