CN-121986660-A - Annular double-T ventilation structure and device based on pore anisotropy

CN121986660ACN 121986660 ACN121986660 ACN 121986660ACN-121986660-A

Abstract

The invention provides an annular double-T ventilation structure and device based on pore anisotropy, and belongs to the technical field of grain storage; the invention forms a double T-shaped composite ventilation network in an outer ring, effectively solves the problem of ventilation blind areas in the central area of the bottom of a silo caused by pore anisotropy when impurity-containing wet grains are piled up, and also provides a wet grain ventilation and cooling device comprising the ventilation structure, which can remarkably improve ventilation uniformity of grain piles, reduce grain temperature, is suitable for rapid warehouse entry ventilation of high impurity-content wet grains, does not need strict cleaning, and saves time and cost.

Inventors

YAN JIANCHUN
WEI HAI
XIE HUANXIONG
An Jiyou
YOU ZHAOYAN
ZHANG HUIJUAN
WANG JIANNAN
LIU MINJI

Assignees

农业农村部南京农业机械化研究所

Dates

Publication Date: 20260508
Application Date: 20260202

Claims (8)

1. The annular double-T ventilation structure based on pore anisotropy is characterized by comprising an annular main air duct (1) and two air inlets (2), wherein the wall part of the annular main air duct (1) is provided with ventilation holes, and the two air inlets (2) are symmetrically arranged along the circumferential direction of the annular main air duct (1) and are respectively communicated with the inside of the annular main air duct (1); The novel air conditioner is characterized by further comprising two T-shaped air channels (3), wherein the T-shaped air channels (3) are arranged in the inner area of the annular main air channel (1), the two T-shaped air channels (3) are symmetrically arranged at the center of the annular main air channel (1), each T-shaped air channel (3) comprises a longitudinal branch pipe (31) and a transverse branch pipe (32), one end of each longitudinal branch pipe (31) is connected with one air inlet (2), the other end of each longitudinal branch pipe extends towards the center of the annular main air channel (1), the transverse branch pipe (32) is connected to the tail end of each longitudinal branch pipe (31), and vent holes are formed in the wall parts of the T-shaped air channels (3).
2. The annular double-T ventilation structure based on pore anisotropy of claim 1 is characterized in that the annular main air duct (1) is a regular hexagon annular air duct, and the regular hexagon annular air duct is formed by splicing six single air ducts with the same length end to end.
3. An annular double-T ventilation structure based on pore anisotropy according to claim 2, characterized in that the ratio of the length with ventilation holes (L1) of the single air duct to the circumcircle diameter (D2) of the annular main air duct (1) satisfies l1= 0.37D2, the ratio of the horizontal distance (L2) of the two lateral branches (32) to the circumcircle diameter (D2) of the annular main air duct (1) satisfies l2= 0.14D2, the ratio of the length (L3) of the lateral branches (32) to the circumcircle diameter (D2) of the annular main air duct (1) satisfies l3= 0.45D2, and the ratio of the length with ventilation holes (L4) of the longitudinal branch (31) to the length (L3) of the lateral branches (32) satisfies l4= 0.5L3.
4. The annular double-T ventilation structure based on pore anisotropy as claimed in claim 1, wherein the ventilation holes on the annular main air duct (1) and/or the T-shaped air duct (3) are/is one of fish scale holes, round holes or square holes.
5. The annular double-T ventilation structure based on pore anisotropy of claim 1, wherein the wall part of the annular main air duct (1) is of a local open pore structure, the inner side wall close to the center of the annular main air duct (1) is an open pore wall, and the outer side wall far away from the center is a non-open pore wall.
6. The wet grain ventilation and cooling device comprises a silo and a ventilation assembly arranged at the bottom of the silo, wherein the ventilation assembly comprises two centrifugal fans (4) which are oppositely arranged and an annular air duct which is communicated with the centrifugal fans (4), and the wet grain ventilation and cooling device is characterized in that the annular air duct is of an annular double-T ventilation structure according to any one of claims 1-5.
7. The ventilating and cooling device for wet grains according to claim 6, wherein a partition plate is arranged in the air pipe corresponding to the symmetrical axis of the annular main air duct (1), and the partition plate isolates air inlet of the fans at two sides.
8. The wet grain aeration-cooling device according to claim 7, wherein the ratio of the diameter (D1) of the silo to the diameter (D2) of the circumcircle of the annular main air duct (1) is d2=0.7D1.

Description

Annular double-T ventilation structure and device based on pore anisotropy Technical Field The invention relates to the technical field of grain storage, in particular to an annular double-T ventilation structure and device based on pore anisotropy. Background After the grain is harvested in the field, the temperature is higher due to the influence of factors such as solar irradiation, respiration heat generation in a stacking state and the like. In the case of wheat, the grain temperature can reach 38-40 ℃ when transported to the drying site, at which temperature the shelf life of the grain is extremely short, typically not exceeding 12 hours. With the improvement of the agricultural mechanization level in China, regional concentrated harvest is becoming a common phenomenon, and a large amount of grains are concentrated in a very short time. However, the mechanized drying capability matched with the grain dryer is seriously insufficient, so that grains are required to be piled up and queued for a long time before being dried, and the quality guarantee in the process becomes a pain problem to be solved urgently in the industry. Forced ventilation is carried out on the newly-stored height Wen Guwu, and the temperature of the grain pile is timely reduced by utilizing the evaporation effect, so that the method is an effective means for delaying quality degradation. At present, the ventilation structure commonly adopted in the industry is a single-port air inlet structure such as a 'one' -shaped structure, a 'cross' -shaped structure or a 'Feng' -shaped structure. These traditional structures have the uneven, the unreasonable scheduling problem of air current distribution of ventilation route, lead to grain heap inside to exist on a large scale ventilation blind area, and the cooling effect is poor, can't satisfy the demand of high quality. In order to solve the above-mentioned problems, an improved ventilation structure is proposed in the prior art, for example, chinese patent CN118556516a discloses a six-sided annular double-port air inlet ventilation structure, which improves ventilation uniformity to a certain extent and reduces ventilation dead zones by forming an annular air duct. However, the design of this structure is based on an idealized stacking model, i.e. the grains are required to be strictly sorted, have a low impurity content and be stacked uniformly. In actual agricultural production, in order to rob agriculture, the newly harvested grains usually contain a large amount of straw, glume, broken grains and other impurities, and are directly sent to a temporary silo without being cleaned. Under the action of gravity, the impurities are easy to gather and compact in the central area of the bottom of the silo, so that the porosity among grains in the area is obviously lower than that in the peripheral area, and strong pore anisotropy is formed. This uneven pore distribution makes the air flow more prone to pass through the less resistive peripheral region and "detour" the central compacted region, rendering this region a new, more severe ventilation dead zone. At this time, the original six-sided annular double-port ventilation structure cannot effectively cope with the complex pore distribution, the ventilation uniformity is obviously reduced, the high heat in the central area cannot be timely removed, and the risk of cereal mildew still exists. Therefore, there is an urgent need in the art for a novel ventilation structure that can adapt to the anisotropic characteristics of the stacking pores of grains containing impurities, and in particular can effectively solve the problem of ventilation blind areas in the central area of the bottom of the silo. Disclosure of Invention The invention aims to provide an annular double-T ventilation structure and device based on pore anisotropy, which are applied to wet grain cooling devices, and can be used for entering a bin for ventilation without spending extra time for strictly cleaning grains when harvesting season time is urgent, thereby accelerating harvesting operation rhythm, conforming to agricultural production practice, reducing dependence on pretreatment (cleaning) equipment and technology, and saving time and economic cost for farmers. The annular double-T ventilation structure based on pore anisotropy comprises an annular main air duct and two air inlets, wherein the wall part of the annular main air duct is provided with ventilation holes, and the two air inlets are symmetrically arranged along the circumferential direction of the annular main air duct and are respectively communicated with the inside of the annular main air duct; The air conditioner further comprises two T-shaped air channels, the T-shaped air channels are arranged in the inner area of the annular main air channel and are symmetrically arranged at the center of the annular main air channel, each T-shaped air channel comprises a longitudinal branch pipe and a transverse branch p