Pressure equalizing orifice plate for hot air distribution chamber of modified starch dryer

Abstract

The utility model relates to fine chemical plate material field discloses modified starch drying machine hot -blast distribution chamber pressure equalizing orifice plate, including plate body, the plate body central region is provided with the resistance increasing area, the plate body middle section area is provided with the balance area, the plate body peripheral region is provided with the resistance reducing area, the resistance increasing area inside is provided with third vent hole, the balance area inside is provided with second vent hole, the resistance reducing area inside is provided with first vent hole, the third vent hole aperture is less than the aperture of second vent hole. In the utility model, through the resistance increasing area, balance area, resistance reducing area of plate body, the hot -blast resistance is adjusted with the vent hole of different aperture and distribution density, the resistance increasing area slows down the central wind speed, the resistance reducing area promotes the peripheral wind speed, the balance area transitions and connects, finally forms the even wind curtain, lets the starch even drying under the heat, effectively avoids partial excessive drying or drying not thorough, improves product quality stability.

Description

Technical Field

[0001] This utility model relates to the field of fine chemical sheet materials, and in particular to a pressure equalization perforated plate for the hot air distribution chamber of a modified starch dryer. Background Technology

[0002] The pressure equalization perforated plate in the hot air distribution chamber of the modified starch dryer is mainly used in the hot air distribution chamber of the modified starch dryer. It is widely used in industries that require the processing of modified starch, such as food processing, papermaking, and feed production. Its core function is to make the hot air entering the dryer more evenly distributed and prevent some starch from being blown away or not dried thoroughly.

[0003] Currently, the pressure equalizing perforated plates on the market are mainly composed of heat-resistant metal plates, holes on the plates, and a coating to prevent starch from sticking. They mainly rely on the holes on the metal plates to regulate the flow rate and direction of hot air, so that the hot air is blown evenly onto the starch, thereby achieving the effect of uniform starch drying and ensuring product quality.

[0004] In actual operation, the pressure equalization perforated plates in the hot air distribution chamber of existing modified starch dryers often become clogged because starch easily sticks to the inner wall of the holes or accumulates at the openings, thus affecting the passage of hot air. Therefore, a pressure equalization perforated plate for the hot air distribution chamber of modified starch dryers is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a pressure equalization perforated plate for the hot air distribution chamber of a modified starch dryer, which aims to improve the problem that starch easily sticks to the inner wall of the holes or accumulates at the openings, causing the holes to be frequently blocked.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a pressure equalization perforated plate for the hot air distribution chamber of a modified starch dryer, comprising a plate body, a resistance-increasing zone in the central region of the plate body, a balance zone in the middle section of the plate body, a resistance-reducing zone in the outer periphery of the plate body, a third vent hole inside the resistance-increasing zone, a second vent hole inside the balance zone, and a first vent hole inside the resistance-reducing zone. The diameter of the third vent hole is smaller than the diameter of the second vent hole, the diameter of the second vent hole is smaller than the diameter of the first vent hole, the distribution density of the third vent hole is greater than the distribution density of the second vent hole, and the distribution density of the second vent hole is greater than the distribution density of the first vent hole.

[0007] As a further description of the above technical solution:

[0008] The top diameter of the first vent, the second vent, and the third vent is larger than the bottom diameter.

[0009] As a further description of the above technical solution:

[0010] The first vent, the second vent, and the third vent all have beveled openings at the top and bottom.

[0011] As a further description of the above technical solution:

[0012] The inner walls of the first vent, the second vent, and the third vent are all fixedly connected with a coating.

[0013] As a further description of the above technical solution:

[0014] The coating material is a PTFE anti-stick coating.

[0015] This utility model has the following beneficial effects:

[0016] 1. In this utility model, the hot air resistance is adjusted by the resistance-increasing zone, the balance zone, and the resistance-reducing zone of the plate body, and the ventilation holes with different apertures and distribution densities. The resistance-increasing zone slows down the central wind speed, the resistance-reducing zone increases the peripheral wind speed, and the balance zone is connected to form a uniform air curtain, so that the starch is heated and dried evenly, effectively avoiding local over-drying or incomplete drying, and improving the stability of product quality.

[0017] 2. In this utility model, the structure design of the vent hole, which is wider at the top and narrower at the bottom, facilitates the smooth entry of hot air and can carry out a small amount of starch that enters the channel. Combined with the oblique guide at the orifice opening, it reduces the accumulation of starch at the orifice opening. In addition, the anti-stick coating on the orifice wall reduces the adhesion of starch and prevents starch from sticking to the wall, which greatly reduces the blockage of the channel, reduces the maintenance frequency, ensures the continuous smooth flow of hot air, maintains the stable operation of the dryer, and reduces downtime costs. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of the pressure equalization perforated plate in the hot air distribution chamber of the modified starch dryer proposed in this utility model;

[0019] Figure 2 This is a cross-sectional schematic diagram of the pressure equalization perforated plate in the hot air distribution chamber of the modified starch dryer proposed in this utility model.

[0020] Figure 3 This is a schematic diagram of the oblique opening of the pressure equalization perforated plate in the hot air distribution chamber of the modified starch dryer proposed in this utility model;

[0021] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0022] Legend:

[0023] 1. Sheet body; 2. Resistance-increasing zone; 3. Balance zone; 4. Resistance-reducing zone; 5. First vent; 6. Second vent; 7. Third vent; 8. Bevel; 9. Coating. Detailed Implementation

[0024] 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.

[0025] Reference Figures 1-3 An embodiment of this utility model provides a pressure equalization perforated plate for the hot air distribution chamber of a modified starch dryer, comprising a plate body 1, a resistance-increasing zone 2 in the central region of the plate body 1, a balance zone 3 in the middle section of the plate body 1, a resistance-reducing zone 4 at the outer periphery of the plate body 1, a third vent 7 inside the resistance-increasing zone 2, a second vent 6 inside the balance zone 3, and a first vent 5 inside the resistance-reducing zone 4. The diameter of the third vent 7 is smaller than the diameter of the second vent 6, the diameter of the second vent 6 is smaller than the diameter of the first vent 5, the distribution density of the third vent 7 is greater than the distribution density of the second vent 6, and the distribution density of the second vent 6 is greater than the distribution density of the first vent 5.

[0026] When hot air enters the distribution chamber, due to the influence of the air inlet location and chamber structure, the central area tends to have a more concentrated air volume and higher pressure, while the peripheral area has a relatively insufficient air volume and lower pressure. The resistance-increasing zone 2 increases the resistance of hot air passage through smaller apertures and denser pore distribution, slowing down the wind speed and reducing the pressure in the central area, preventing the starch from being blown away or over-drying due to excessive hot air. The resistance-reducing zone 4 reduces the resistance of hot air passage through larger apertures and sparser pore distribution, increasing the wind speed and supplementing the pressure in the peripheral area, preventing the starch from drying incompletely due to insufficient hot air. The pore size and density of the balancing zone 3 are between the two, playing a transitional role, ultimately forming a uniform air curtain with uniform flow rate and pressure under the entire board body 1, ensuring consistent starch drying effect.

[0027] Reference Figures 1-3 The top diameters of the first vent 5, the second vent 6, and the third vent 7 are all larger than the bottom diameters.

[0028] The larger diameter at the top allows hot air to enter the channel more smoothly, reducing the impact and eddies at the orifice opening and preventing starch particles from accumulating at the orifice opening due to airflow turbulence. The relatively smaller diameter at the bottom allows for moderate airflow concentration when hot air exits the channel, enabling the hot air to act more precisely on the starch layer below. At the same time, this top-wide and bottom-narrow channel structure reduces the probability of starch adhering to the inner wall of the channel due to reverse airflow or its own stickiness. Even if a small amount of starch enters the channel, it will be more easily carried out of the channel by subsequent hot air due to the gradient design of the channel, reducing the risk of clogging.

[0029] Reference Figures 1-3 The first vent 5, the second vent 6 and the third vent 7 are all provided with slanted openings 8 at the top and bottom.

[0030] The top bevel 8 guides the hot air entering the channel, allowing it to enter at a gentler angle rather than impacting the channel wall vertically. This reduces noise from airflow impact and prevents high-speed airflow from pressing starch granules directly onto the channel wall, causing blockage. The bottom bevel 8 allows the hot air exiting the channel to spread at a wider angle, covering the starch more evenly and preventing hot air from concentrating at one point and causing localized over-drying of the starch. At the same time, the bevel 8 eliminates the sharp edges of the orifice, reducing the possibility of starch accumulating at the edges and further reducing the risk of blockage.

[0031] Reference Figures 2-4 The inner walls of the first vent 5, the second vent 6, and the third vent 7 are all fixedly connected with a coating 9.

[0032] During the drying process, modified starch tends to adhere to the inner wall of the vents due to its own stickiness. Long-term accumulation can lead to narrowing or even blockage of the vents, affecting the flow of hot air. Coating 9 can form a smooth isolation layer on the inner wall of the vents, which greatly reduces the adhesion between the starch and the vent wall, making it difficult for the starch to stick to the vent wall. Even if a small amount of starch comes into brief contact, it will be carried away by the continuous action of hot air, thus keeping the vents unobstructed and ensuring that the hot air can pass through the perforated plate stably and evenly, thus ensuring the stability of starch drying.

[0033] Reference Figures 2-4 The material of coating 9 is a PTFE anti-stick coating.

[0034] The PTFE anti-stick coating itself has extremely strong non-stick properties and a smooth surface, which can fundamentally solve the problem of starch sticking to the wall. At the same time, it can also adapt to the hot air temperature environment of 120-180℃ in the modified starch dryer. It is not easy to deform or fail under long-term high temperature and can continuously play its anti-stick role. In addition, the PTFE material has good chemical stability and will not react with starch or the small amount of volatile substances produced during the drying process. It will not contaminate the starch product and can also ensure the service life of the coating itself, reduce the maintenance frequency of the perforated plate, and reduce downtime costs in the production process.

[0035] Working principle: When hot air enters the hot air distribution chamber of the modified starch dryer, due to the influence of the air inlet position and chamber structure, the air volume in the central area is more concentrated and the pressure is higher, while the air volume in the outer area is insufficient and the pressure is lower. At this time, the plate body 1 achieves hot air pressure equalization through its central resistance-increasing zone 2, the middle section balance zone 3, and the outer resistance-reducing zone 4. The third vent 7 in the resistance-increasing zone 2 has a smaller aperture than the second vent 6 in the balance zone 3 and a higher distribution density, which increases the resistance of hot air passage to reduce the wind speed in the central area and lower the pressure. To prevent excessively strong hot air from blowing away the starch or causing it to over-dry, the first vent 5 in the drag-reducing zone 4, with a larger diameter and lower distribution density than the second vent 6, reduces the resistance of the hot air flow, thereby increasing the wind speed and supplementing pressure in the surrounding area. This prevents the starch from drying incompletely due to weak hot air. The balance zone 3, through the transition effect of the second vent 6, creates a uniform air curtain with consistent flow rate and pressure below the entire board body 1. Simultaneously, the first vent 5, second vent 6, and third vent 7 are all designed with a top diameter greater than... The bottom aperture allows hot air to enter the channel more smoothly, reducing eddies and starch buildup at the orifice. It also concentrates the airflow as hot air exits, ensuring precise application to the starch layer. Furthermore, it reduces starch adhesion and allows subsequent hot air to carry it out of the channel, lowering the risk of blockage. The beveled openings 8 at the top and bottom of these three parts guide the hot air entering the channel, ensuring a smooth flow and reducing noise and starch pressure blockage. They also ensure more even diffusion of the exiting hot air, preventing excessive localized drying and eliminating orifice sharp edges to reduce starch accumulation. Additionally, the first vent 5... The coating 9, which is fixedly connected to the inner walls of the second vent 6 and the third vent 7, can form a smooth isolation layer that significantly reduces the adhesion between starch and the vent wall, preventing starch from accumulating and clogging the vents due to sticky adhesion. The PTFE anti-stick coating can adapt to hot air environments of 120-180℃ and is not easily deformed or degraded under long-term high temperatures. It also has good chemical stability and will not react with starch or volatile substances generated during the drying process to contaminate the product. It can continuously keep the vents unobstructed, ensuring that hot air passes through the perforated plate stably and evenly, ultimately ensuring consistent starch drying results.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pressure equalizing orifice plate for use in a hot air distribution chamber of a modified starch dryer, comprising a plate body (1), characterized in that: The plate body (1) has a resistance-increasing zone (2) in the central area, a balance zone (3) in the middle section of the plate body (1), and a resistance-reducing zone (4) in the outer area of ​​the plate body (1). The resistance-increasing zone (2) has a third vent (7) inside, the balance zone (3) has a second vent (6) inside, and the resistance-reducing zone (4) has a first vent (5) inside. The diameter of the third vent (7) is smaller than that of the second vent (6), the diameter of the second vent (6) is smaller than that of the first vent (5), the distribution density of the third vent (7) is greater than that of the second vent (6), and the distribution density of the second vent (6) is greater than that of the first vent (5).

2. The modified starch dryer hot air distribution chamber equalization orifice plate of claim 1, wherein: The top diameter of the first vent (5), the second vent (6) and the third vent (7) is larger than the bottom diameter.

3. The modified starch dryer hot air distribution plenum equalization orifice plate of claim 1 wherein: The first vent (5), the second vent (6) and the third vent (7) are all provided with slanted openings (8) at the top and bottom.

4. The modified starch dryer hot air distribution plenum equalization orifice plate of claim 1 wherein: The inner walls of the first vent (5), the second vent (6) and the third vent (7) are all fixedly connected with a coating (9).

5. The modified starch dryer hot air distribution plenum equalization orifice plate of claim 4 wherein: The material of the coating (9) is a PTFE anti-stick coating.

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