Backflow air guide structure and in-furnace self-circulation type air stirring system applying same

Abstract

The utility model discloses a backflow air guide structure and an in-furnace self-circulation type air stirring system applying the backflow air guide structure, and relates to the technical field of heating furnaces, the backflow air guide structure comprises an air guide cover, and a centrifugal air wheel containing chamber, a radial air chamber and an axial backflow opening are formed in the air guide cover; a circulating air guide assembly is arranged on the air guide cover, and the circulating air guide assembly enables air in the radial air chamber to be guided out of the radial air chamber along a circulating air guide channel and enables the angle formed by the guiding-out direction of the air guided out of the circulating air guide channel and the axial air inlet direction of the centrifugal wind wheel to be larger than 90 degrees and smaller than 180 degrees; the angle formed by the guiding-out direction of the gas guided out of the circulating air guiding channel and the radial air outlet direction of the centrifugal wind wheel is smaller than 90 degrees; in the circular flowing process, gas impact reversing can be conducted without the aid of the inner wall of the working furnace, or the situation that gas impact reversing is conducted with the aid of the inner wall of the working furnace can be effectively reduced, and therefore the situation that dust on the inner wall of the working furnace is impacted and rolled up is effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of heating furnace technology, and in particular to a reflux air guide structure and an in-furnace self-circulating agitator system using the same. Background Technology

[0002] When heating products using ovens such as baking ovens and drying ovens, a fan device is usually installed to ensure uniform temperature. For example, a separate oven fan device is proposed in Chinese invention application CN117760192A, which includes a fixed plate. A fan motor is fixedly connected to the top of the fixed plate. An extension shaft is fixedly connected to the output shaft of the fan motor. A fan wheel is fixedly connected to the bottom end of the extension shaft. A fan layer sealing plate is fixedly connected to the bottom of the fixed plate. A vortex is fixedly connected to the bottom of the fan layer sealing plate. The extension shaft and the middle of the vortex are rotatably connected via a bearing. The fan wheel is located inside the vortex. Two handles are fixedly connected to the top of the fixed plate. Multiple mounting holes are provided on the fixed plate for mounting the fixed plate on the outer shell of the oven.

[0003] When this type of air conveying device is in use, it needs to be coordinated with the inner wall of the furnace body so that the gas impacts the inner wall of the furnace body and then changes direction to reach the air inlet of the impeller for air intake.

[0004] For example, the double-layer vacuum internal air-circulating baking oven proposed in Chinese utility model with announcement number CN221099181U requires the fan outlet to cooperate with the bottom wall and top wall of the chamber so that the gas can be diverted to the middle position of the chamber after hitting the bottom wall and top wall, and then be drawn in by the fan inlet to achieve circulating air circulation.

[0005] However, the air circulation caused by the impact with the inner wall of the furnace (chamber) can easily stir up dust inside the furnace, especially a large amount of dust deposited on the bottom wall of the furnace, causing a large amount of dust to adhere to the product. In some specific products, such as those that need to be dried after painting, when a large amount of dust adheres to the product during the drying process inside the furnace, it directly leads to product defects. Utility Model Content

[0006] To overcome the shortcomings mentioned above, this utility model aims to provide a reflux air guide structure and an in-furnace self-circulating agitator system that can achieve circulating air circulation within the furnace body and reduce the collision and reversal of gas with the inner wall of the furnace body during the circulating air circulation process.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a reflux air guide structure, including an air guide hood, a centrifugal impeller housing chamber inside the air guide hood for accommodating a centrifugal impeller, a radial air chamber communicating with the centrifugal impeller housing chamber inside the air guide hood, the radial air chamber corresponding to the radial air outlet of the centrifugal impeller housed in the centrifugal impeller housing chamber, and an axial reflux port corresponding to the axial air inlet of the centrifugal impeller; a circulating air guide assembly communicating with the radial air chamber is provided on the air guide hood, the circulating air guide assembly is configured to allow gas in the radial air chamber to be discharged out of the radial air chamber along a circulating air guide channel, and is configured such that the angle between the gas discharge direction from the circulating air guide channel and the axial air inlet direction of the centrifugal impeller is greater than 90° and less than 180°, and the angle between the gas discharge direction from the circulating air guide channel and the radial air outlet direction of the centrifugal impeller is less than 90°.

[0008] As a further embodiment of this utility model: the circulating air guide channel includes a contraction section, a throat section, and an expansion section connected in sequence; wherein, the portion of the contraction section near the throat section is designed to contract, and the portion of the contraction section away from the throat section is connected to the radial air chamber; the portion of the expansion section away from the throat section is designed to expand and is connected to the outside of the air guide shroud.

[0009] As a further embodiment of this utility model: the contraction section is gradually narrowed, and the expansion section is gradually widened.

[0010] As a further embodiment of this utility model: the circulating air guide assembly includes an axial inner baffle pipe corresponding to the axial air inlet of the centrifugal impeller; wherein, the proximal end of the axial inner baffle pipe corresponds to the axial air inlet of the centrifugal impeller, and the distal end of the axial inner baffle pipe is outwardly flared; the circulating air guide assembly also includes an outer air guide pipe, which is sleeved outside the axial inner baffle pipe, and has a distal end corresponding to the distal end of the axial inner baffle pipe, and the distal end of the outer air guide pipe is outwardly flared; a circulating air guide channel is formed between the inner surface of the outer air guide pipe and the outer surface of the axial inner baffle pipe, the circulating air guide channel has an air guide outlet near the distal end of the axial inner baffle pipe, and the circulating air guide channel has an air guide inlet near the proximal end of the axial inner baffle pipe, and the air guide inlet is connected to the radial air chamber.

[0011] As a further embodiment of this utility model: the axial inner baffle has an inner intermediate connecting section for connecting the proximal end and the distal end of the axial inner baffle, and the proximal end of the axial inner baffle is constricted in the direction away from the intermediate connecting section; the outer air guide has an outer intermediate connecting section corresponding to the inner intermediate connecting section, and a proximal end corresponding to the proximal end of the axial inner baffle, and the proximal end of the outer air guide is expanded outward in the direction away from the outer intermediate connecting section.

[0012] As a further embodiment of this utility model: the distal end of the axial inner baffle pipe has an additional baffle section that extends beyond the outer air guide pipe.

[0013] As a further embodiment of this utility model, the circulating air guide assembly also includes a filter screen disposed in the pipe channel of the axial inner baffle pipe.

[0014] As a further embodiment of this utility model: the air guide shroud has an arc-shaped inner wall that corresponds to the radial air outlet of the centrifugal impeller, and the arc-shaped inner wall guides the gas toward the air guide inlet.

[0015] This utility model also provides the following technical solution: an in-furnace self-circulating agitator system for driving the gas in the working furnace to circulate in the furnace, including the above-mentioned return air guide structure.

[0016] As a further embodiment of this utility model, it also includes a centrifugal impeller disposed in the centrifugal impeller housing chamber and a mounting frame connected to the air guide shroud; the centrifugal impeller is powered by a drive motor; the air guide shroud is installed in the furnace body of the working furnace through the mounting frame, and is configured to connect the axial return port and the circulating air guide channel with the same working space inside the furnace body.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] 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.

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0021] Figure 3 This is a schematic diagram of gas circulation in this utility model.

[0022] The corresponding labels in the attached diagram are explained as follows:

[0023] Air guide shroud-1, centrifugal impeller housing chamber-2, radial air chamber-3, axial return port-4, circulating air guide assembly-5, arc-shaped guide inner wall-6

[0024] Circulating air guide channel-51, contraction section-511, throat section-512, expansion section-513.

[0025] Axial inner baffle tube - 52, proximal end of axial inner baffle tube - 521, distal end of axial inner baffle tube - 522, inner intermediate connecting section - 523.

[0026] External air duct - 53, near end of external air duct - 531, far end of external air duct - 532, external intermediate connecting section - 533, additional flow barrier section - 524, filter screen - 525.

[0027] Centrifugal fan-100, mounting bracket-200. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Please see Figure 1-3 A reflux air guide structure includes an air guide hood 1, an air guide hood 1 having a centrifugal impeller housing chamber 2 for housing a centrifugal impeller 100, an air guide hood 1 also having a radial air chamber 3 communicating with the centrifugal impeller housing chamber 2, the radial air chamber 3 corresponding to the radial air outlet of the centrifugal impeller 100 housed in the centrifugal impeller housing chamber 2, and an axial reflux port 4 corresponding to the axial air inlet of the centrifugal impeller 100.

[0030] The air guide shroud 1 is provided with a circulating air guide assembly 5 that communicates with the radial air chamber 3. The circulating air guide assembly 5 is configured to allow the gas in the radial air chamber 3 to be discharged outside the radial air chamber 3 along a circulating air guide channel 51. It is configured such that the angle between the gas discharge direction discharged from the circulating air guide channel 51 and the axial air intake direction of the centrifugal impeller 100 is greater than 90° and less than 180°, and the angle between the gas discharge direction discharged from the circulating air guide channel 51 and the radial air outlet direction of the centrifugal impeller 100 is less than 90°.

[0031] like Figure 3As shown, taking the vertically upward axial air intake direction as an example, when the centrifugal impeller 100 rotates and continuously blows the gas below into the radial air chamber 3, a negative pressure zone is formed below the centrifugal impeller 100. The circulating air guide assembly 5 allows the gas to be discharged in a downward and obliquely outward direction. On the one hand, the oblique outward discharge setting can reduce the collision with the airflow of the axial air intake. On the other hand, it allows the gas to flow to the negative pressure zone below after being discharged, and then be driven by the negative pressure, and then continue to be driven to flow back into the radial air chamber 3, forming a gas circulation flow. In this circulation flow process, it is not necessary to use the inner wall of the working furnace for gas collision and reversal, or it can effectively reduce the situation of gas collision and reversal using the inner wall of the working furnace, thereby effectively reducing the situation of dust on the inner wall of the working furnace being impacted and rolled up.

[0032] In some embodiments, the circulating air duct 51 includes a contraction section 511, a throat section 512, and an expansion section 513 connected in sequence; wherein, the portion of the contraction section 511 near the throat section 512 is contracted, and the portion of the contraction section 511 away from the throat section 512 is connected to the radial air chamber 3; the portion of the expansion section 513 away from the throat section 512 is expanded and is connected to the outside of the air duct 1.

[0033] Through the design of the above-mentioned contraction section 511, throat section 512 and expansion section 513, the gas forms a Laval effect when passing through the circulating air guide channel 51, thereby effectively increasing the gas velocity and making the range of air circulation and agitation larger and more applicable.

[0034] Preferably, the contraction section 511 is gradually narrowed, and the expansion section 513 is gradually expanded.

[0035] In some embodiments, the circulating air guide assembly 5 includes an axial inner baffle 52 corresponding to the axial air intake of the centrifugal impeller 100; wherein the proximal end 521 of the axial inner baffle corresponds to the axial air intake of the centrifugal impeller 100, and the distal end 522 of the axial inner baffle is arranged to expand outward.

[0036] The circulating air guide assembly 5 also includes an external air guide duct 53, which is sleeved outside the axial inner baffle duct 52. The external air guide duct has a distal end corresponding to the distal end 522 of the axial inner baffle duct, and the distal end 532 of the external air guide duct is arranged to expand outward.

[0037] A circulating air guide channel 51 is formed between the inner side of the outer air guide duct 53 and the outer side of the axial inner baffle duct 52. The circulating air guide channel 51 has an air guide outlet near the far end 522 of the axial inner baffle duct and an air guide inlet near the near end 521 of the axial inner baffle duct. The air guide inlet is connected to the radial air chamber.

[0038] In some embodiments, the axial inner baffle 52 has an inner intermediate connecting section 523 for connecting the proximal end 521 and the distal end 522 of the axial inner baffle, and the proximal end 521 of the axial inner baffle is constricted in a direction away from the intermediate connecting section 523; the outer air guide 53 has an outer intermediate connecting section 533 corresponding to the inner intermediate connecting section 523, and a proximal end corresponding to the proximal end 521 of the axial inner baffle, and the proximal end 531 of the outer air guide is expanded outward in a direction away from the outer intermediate connecting section 523.

[0039] The axial inner baffle 52 can separate the axially inflowing airflow from the outflowing airflow to avoid generating opposing turbulence. On the other hand, the axial inner baffle 52 and the outer air guide 53 are combined to form a circulating air guide channel 51 to achieve directional exhaust of gas. Furthermore, by expanding or contracting the ends of the axial inner baffle 52 and the outer air guide 53, a Laval effect is formed that can increase the gas exhaust velocity, resulting in better functionality.

[0040] In some embodiments, the air guide cover has a connecting bracket for connecting the outer air guide duct and the axial inner isolation duct.

[0041] In some embodiments, the distal end 522 of the axial inner baffle has an additional baffle section 524 that extends beyond the outer air duct 53.

[0042] In some embodiments, the circulating air guide assembly 5 further includes a filter screen 525 disposed in the pipe channel of the axial inner baffle 52.

[0043] In this embodiment, a furnace self-circulating agitator system is also proposed to drive the gas in the working furnace (not shown) to circulate within the furnace, including the reflux guide structure of any of the above embodiments.

[0044] In this embodiment, the in-furnace self-circulating agitator system further includes a centrifugal impeller 100 disposed in the centrifugal impeller housing 2 and a mounting bracket 200 connected to the air guide shroud 1; the centrifugal impeller 100 is powered by a drive motor (not shown); the air guide shroud 1 is installed in the furnace body of the working furnace through the mounting bracket 200, and is configured to connect the axial return port 4 and the circulating air guide channel 51 with the same working space inside the furnace body. This achieves circulating airflow within the furnace body. During this circulating flow, the impact and reversal of gas through the inner wall of the working furnace can be reduced or eliminated, thereby effectively reducing the impact and uplift of dust from the inner wall of the working furnace.

[0045] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A reflux air guiding structure, comprising an air guide shroud, the air guide shroud having a centrifugal impeller receiving chamber for accommodating a centrifugal impeller, characterized in that, The air guide hood also has a radial air chamber that communicates with the centrifugal impeller housing chamber. The radial air chamber corresponds to the radial air outlet of the centrifugal impeller housed in the centrifugal impeller housing chamber. The air guide hood has an axial return port that corresponds to the axial air inlet of the centrifugal impeller. The air guide shroud is equipped with a circulating air guide assembly that communicates with the radial air chamber. The circulating air guide assembly is configured to allow the gas in the radial air chamber to be discharged out of the radial air chamber along a circulating air guide channel. It is configured such that the angle between the direction of gas discharge from the circulating air guide channel and the axial air intake direction of the centrifugal impeller is greater than 90° and less than 180°, and the angle between the direction of gas discharge from the circulating air guide channel and the radial air outlet direction of the centrifugal impeller is less than 90°.

2. The recirculation air guide structure according to claim 1, characterized in that, The circulating air guide channel includes a contraction section, a throat section, and an expansion section connected in sequence; in, The portion of the contraction section near the throat is designed for contraction, while the portion of the contraction section away from the throat is connected to the radial air chamber. The portion of the expansion section away from the throat section is the expansion setting and connects to the outside of the air guide shroud.

3. The recirculation air guide structure according to claim 2, characterized in that, The contraction section is designed to gradually shrink, and the expansion section is designed to gradually expand.

4. The return air guiding structure according to any one of claims 1-3, characterized in that, The circulating air guide assembly includes an axial inner baffle tube corresponding to the axial air intake of the centrifugal impeller; Among them, the near end of the axial inner baffle tube corresponds to the axial air inlet of the centrifugal impeller, and the far end of the axial inner baffle tube is set outward. The circulating air guide assembly also includes an external air guide duct, which is sleeved outside the axial inner baffle tube. The external air guide duct has a distal end corresponding to the distal end of the axial inner baffle tube, and the distal end of the external air guide duct is arranged to expand outward. A circulating air guide channel is formed between the inner side of the outer air guide duct and the outer side of the axial inner baffle duct. The circulating air guide channel has an air guide outlet near the far end of the axial inner baffle duct and an air guide inlet near the near end of the axial inner baffle duct. The air guide inlet is connected to the radial air chamber.

5. The recirculation air guide structure according to claim 4, characterized in that, The axial inner baffle has an inner intermediate connecting section for connecting the proximal end and the distal end of the axial inner baffle, and the proximal end of the axial inner baffle is set to contract away from the intermediate connecting section. The outer air duct has an outer intermediate connecting section corresponding to the inner intermediate connecting section, and a proximal end corresponding to the proximal end of the axial inner baffle pipe. The proximal end of the outer air duct is set to expand outward in a direction away from the outer intermediate connecting section.

6. The recirculation air guide structure according to claim 4, characterized in that, The distal end of the axial inner baffle has an additional baffle section that extends beyond the outer air guide duct.

7. The recirculation air guide structure according to claim 4, characterized in that, The circulating air guide assembly also includes a filter screen disposed in the pipe channel of the axial inner baffle.

8. The recirculation air guide structure according to claim 4, characterized in that, The air guide shroud has an arc-shaped inner wall that corresponds to the radial air outlet of the centrifugal impeller. The arc-shaped inner wall guides the gas toward the air guide inlet.

9. A furnace self-circulating agitator system for driving the gas inside the working furnace to circulate within the furnace, characterized in that, Includes the return air guide structure as described in any one of claims 1-8.

10. The in-furnace self-circulating agitator system according to claim 9, characterized in that, It also includes a centrifugal impeller housed in the centrifugal impeller housing and a mounting bracket connected to the air guide shroud; The centrifugal impeller is powered by a drive motor; The air guide hood is installed inside the furnace body of the working furnace via a mounting bracket, thus connecting the axial return port and the circulating air guide channel to the same working space inside the furnace body.

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