CN217064659U

CN217064659U - Utilize granary low temperature of capillary network to store up grain system

Info

Publication number: CN217064659U
Application number: CN202220926317.8U
Authority: CN
Inventors: 顾兆林; 瞿钟珂; 罗昔联; 孟祥兆; 周典; 钱靖; 朱姝羽; 戴中文; 赵艳妍; 高源�
Original assignee: Xian Jiaotong University
Current assignee: Xian Jiaotong University
Priority date: 2022-04-20
Filing date: 2022-04-20
Publication date: 2022-07-29
Anticipated expiration: 2032-04-20

Abstract

The utility model discloses a granary low-temperature grain storage system utilizing a capillary network, which consists of an air source heat pump, a circulating water pump, a valve, a circulating pipeline, a fan, a ventilation ground groove, an anti-condensation coating, a capillary network, a heat insulation layer, an air inlet pipe and an air exhaust pipe; by utilizing capillary networks arranged on the wall surface and the top of the granary, a radiation surface with large refrigeration area and uniform temperature change is formed in the cold supply season, the temperature of the wall surface is reduced by adopting a radiation refrigeration mode, the temperature of the granary is further reduced, and cooling water in the system flows to an air source heat pump to maintain a low-temperature state and then flows back to form a circulating cooling water system; in winter, the arrangement of the ventilation ducts is improved, natural cold sources are used for cold accumulation, and the interior of the barn is kept in a low-temperature state all the year round, so that green low-temperature grain storage is realized.

Description

Utilize granary low temperature of capillary network to store up grain system

Technical Field

The utility model belongs to grain and oil storage field relates to an utilize granary low temperature grain storage system of capillary network.

Background

Long-term grain storage practices and researches prove that the low-temperature grain storage can effectively limit the life activities of grain heap organisms and reduce the loss of stored grains; can prevent and eliminate natural heating phenomenon, reduce the grain respiration intensity and keep the due quality of the grain; can reduce the residual pollution of the medicament by using less or no chemical medicament, and the low-temperature grain storage technology is the development direction of the green grain storage technology in the future. In recent years, a plurality of new temperature control technologies are developed, wherein the air conditioner temperature control technology and the internal circulation temperature control technology are most widely applied, and the appearance of the internal circulation temperature control grain storage technology provides a new choice for realizing the low-temperature grain storage of tall and large horizontal warehouses and improving the technical level of green grain storage. However, these techniques still have some problems:

the inner circulation technology utilizes a cold source stored in the grain pile in winter to cool, but in some areas which are cold in winter and hot in summer in the north, the condition of insufficient cold cores in summer can occur; the influence of weather and geographical position is large, and the use in southern areas is limited; the air conditioning system has high energy consumption and certain damage to the environment when being used for constructing a low-temperature environment.

Underground granaries, as one of the types of granaries, have a long history in China. The underground granary is a special granary type which is dug and built by utilizing specific landform and used for grain storage, utilizes the basically constant low-temperature condition of an underground soil layer and a complete granary body structure to store grains, has the advantages of low temperature, sealing, heat insulation and the like, is slightly influenced by external temperature and humidity, is low in heat transfer speed, is small in range of grain stack temperature change in the granary, can keep the temperature of the grain stack in a low-temperature state all the year round if mechanical ventilation is carried out in winter, realizes low-temperature grain storage, and has important significance for guaranteeing national grain safety and improving social and economic benefits.

However, the underground granary has strict requirements on conditions such as terrain, geology, landform and the like, and the terrain with great height difference and large drop is more favorable for building the underground granary, and is often built on terrains such as gullies, hills, mountains, gentle slopes and flat lands with thick soil layers. Therefore, the existing underground warehouse has certain limitation due to high requirement of geological conditions, and cannot be widely popularized in China. If the overground granary can be improved according to the structural characteristics of the underground granary, a low-temperature grain storage system of the granary is designed, so that the underground granary has the advantages of the underground granary, can be kept in a low-temperature state throughout the year, and can not be influenced by natural conditions such as terrain, landform and the like.

Through the search discovery to prior art literature, to the utility model patent that granary low temperature stored grain system has applied for there: (1) the patent of granary inner wall low temperature circulation heat insulation device (patent application number: 202110756479.1) discloses a heat insulation device for granary, which carries out cold air circulation in the heat insulation layer of the granary inner wall to avoid local temperature rise caused by direct solar radiation; (2) the patent 'a cooling pipeline system of a low-temperature granary' (patent application number: 202011009178.4) discloses a cooling pipeline system of a low-temperature granary, which improves pipelines to cool the bottom, the middle part and the top of a granary body, so that the cooling effect of the middle part and the upper part in the granary is better; (3) a patent of a low-temperature grain moisturizing system and method (patent application number: 201710485579.9) discloses a low-temperature grain moisturizing system and method for a grain depot, wherein a vent pipe is laid on the ground, grains are placed on the vent pipe, and cold air enters the grain depot through the vent pipe to reduce the temperature of the grains; the method disclosed by the above patent about the low-temperature grain storage system of the granary is to directly or indirectly cool grains in the granary through cold air and ensure the cooling effect by aiming at the transformation of pipelines in the granary, but the above patent cannot ensure the perennial low temperature in the granary, the large longitudinal temperature gradient in the granary and the poor heat insulation performance of a granary.

Through the search of documents in the prior art, no relevant patent report for establishing a granary low-temperature grain storage system by utilizing a capillary network is found.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a granary low temperature grain storage system using a capillary network aiming at the low temperature storage of grains in a granary. A radiation surface with wide coverage and good refrigeration effect is established, and the forms of mild radiation and natural convection are adopted to reduce the temperature in the granary; in summer, the air source heat pump is utilized to maintain the low-temperature state of the circulating water in the capillary network, and the circulating water is used as a heat insulation layer and simultaneously reduces the temperature in the granary; the arrangement mode of the ventilation duct is improved, the natural cold source is used for cold accumulation through the fan in winter, the interior of the bin is kept in a low-temperature state all the year round, and green low-temperature grain storage is realized.

In order to achieve the above purpose, the utility model adopts the following technical scheme to realize:

a granary low-temperature grain storage system utilizing a capillary network comprises a granary, an air heat source pump, a capillary network pipe, a circulating pipeline, a press-in type axial flow fan, a ventilation ground trough and an axial flow fan; the air heat source pump is arranged outside the granary; one end of the circulating pipeline is connected with the air heat source pump, and the other end of the circulating pipeline is connected with the capillary network pipe in the granary; the capillary net pipes are uniformly distributed on the top and the peripheral inner wall of the granary; the forced axial flow fan is arranged outside the granary; the ventilation ground grooves are uniformly distributed at the bottom of the granary and below the grain pile and are connected with the press-in type axial flow fan; the axial flow fan is connected with the granary. And a circulating water pump and a valve are arranged on the circulating pipeline.

The utility model discloses a further improvement lies in:

and a heat insulation layer is arranged between the capillary network pipe and the inner wall of the granary.

The air outlet of the press-in type axial flow fan is connected with an air inlet pipe; the other end of the air inlet pipe penetrates through the granary and is connected below the ventilation geosyncline.

And fine ventilation holes are uniformly formed in the upper surface of the ventilation ground groove.

And the inner side of the capillary network pipe is provided with an anti-condensation coating.

An air outlet pipe is arranged in the anti-condensation coating, and one end of the air outlet pipe is higher than the grain pile.

And the other end of the air outlet pipe penetrates through the granary and is connected with an air suction opening of the axial flow fan.

Compared with the prior art, the utility model discloses following beneficial effect has:

the utility model realizes the control of the temperature in the granary through the medium flowing in the capillary network, the refrigeration mode has a great refrigeration surface area, the temperature change in the granary and at the wall surface is fast and uniform, the temperature gradient in the vertical direction of the grain heap is reduced, and the defect of large longitudinal temperature gradient in the granary brought by the traditional refrigeration mode is solved;

the capillary network heat exchanger is thin and soft, has small installation thickness, can be combined with a wall material, is convenient to install and does not increase the building area; the capillary network air source heat pump is combined for use, low-grade energy is effectively utilized, high heat efficiency is generated, energy is saved compared with the traditional refrigeration, the environment cannot be polluted, and the defect of energy consumption caused by the traditional refrigeration mode is overcome.

Furthermore, the problem of condensation is avoided to a certain extent, and the refrigerator also has a certain heat insulation effect while refrigerating;

furthermore, by improving the ventilation mode and arranging a new ventilation channel, the refrigeration mode of storing cold energy in the granary by using a natural cold source can be still utilized in winter, and the refrigeration mode is soft and quiet and only generates small air flow, so that the problem of grain moisture reduction caused by ventilation and cooling in the traditional refrigeration mode is solved, and the quality of grains is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is the structural schematic diagram of the low-temperature grain storage system of the utility model.

Fig. 2 is the internal structure schematic diagram of the capillary network of the present invention.

Fig. 3 is a schematic view of the structure of the heat preservation module of the present invention.

Wherein: 1-an air source heat pump; 2-a circulating water pump; 3-a valve; 4-a circulation pipeline; 5-a press-in axial flow fan; 6-axial flow fan; 7-a ventilation ground trough; 8-anti-condensation coating; 9-a capillary network; 10-a thermal insulation layer; 11-air inlet pipe; 12-air outlet pipe.

Detailed Description

To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the attached drawings in the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the embodiments of the present invention, it should be noted that, if the terms "upper", "lower", "horizontal", "inner", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship that the product of the present invention is usually placed when in use, the description is only for convenience of description and simplification, but the indication or suggestion that the device or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be interpreted as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

Furthermore, the term "horizontal", if present, does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "set", "mounted", "connected" and "connected" should be interpreted broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The present invention will be described in further detail with reference to the accompanying drawings:

referring to fig. 1, the embodiment of the utility model discloses a granary low-temperature grain storage system using a capillary network, which comprises an air source heat pump 1; a circulating water pump 2; a valve 3; a circulation pipe 4; a press-in type axial flow fan 5; an axial flow fan 6; a ventilation ground groove 7; an anti-dewing coating 8; a capillary network 9; a heat insulating layer 10; an air inlet duct 11; an air outlet pipe 12.

The specific connection mode is as follows: the air source heat pump 1 is connected with the capillary network 9 through a circulating pipeline 4; the circulating pipeline 4 is provided with a circulating water pump 2 and a valve 3. The air source heat pump 1, the circulating water pump 2, the valve 3 and the circulating pipeline 4 are arranged outside the granary. The capillary network 9 is evenly distributed on the top and the surrounding walls of the granary. After the temperature of the refrigerant is reduced by the air source heat pump 1, the refrigerant is pumped into the circulating pipeline 4 and the capillary network 9 by the circulating water pump 2; the forced axial flow fan 5 is arranged at one end outside the granary and is connected with the air inlet pipe 11; the other end of the air inlet pipe 11 is connected with the ventilation geosyncline 7; the axial flow fan 6 is arranged outside the granary, and the other end of the axial flow fan is connected with the air outlet pipe 12; the ventilation ground slot position 7 is positioned at the bottom in the granary; the other end of the air outlet pipe 12 is arranged at the top in the granary, and the air outlet pipe 12 is tightly attached to the inner wall. In winter, the forced axial flow fan 5 pumps cold air into the air inlet pipe 11, the cold air enters the interior of the granary through the ventilation ground slot 7 to cool the granary, and then the axial flow fan 6 pumps the air out of the air outlet pipe 12 arranged above the granary. The anti-condensation coating 10 and the heat insulation layer 8 form a heat insulation module, and the heat insulation layer 8 is arranged on the outer side of the capillary network and on the inner side of the wall body; the anti-dewing coating 10 is arranged inside the capillary network 9.

The utility model discloses a working process and theory of operation:

the air source heat pump is used for cooling the circulating water in the capillary network 9 in summer and is respectively connected with the circulating water pump 2 and the valve 3 through the circulating pipeline 4, and the circulating water pump 2 and the valve 3 are used for controlling the conveying of the circulating water; the capillary network 9 is used for carrying out radiation refrigeration on the interior of the granary, reducing the environment in the granary and the temperature of grains, and is connected with the circulating pipeline 4 to form a circulating water cooling cycle; the heat insulation layer 10 is used for reducing heat transfer from the external environment to the interior of the granary and is arranged outside the granary in a manner of being tightly attached to the capillary network 9; the anti-condensation coating 8 is used for adsorbing condensation water and preventing the inner wall of the granary from condensation and is arranged at the inner side of the granary in a manner of being tightly attached to the capillary network 9; the air source heat pump 1 utilizes outdoor air as low-level heat energy, the capillary network 9 uses low-quality energy to meet the cooling demand of the granary, and the combination of the low-level heat energy and the capillary network can generate high heat efficiency, so that the energy-saving granary has the advantage of natural energy conservation. The cooling water in the capillary network is sent to the air source heat pump 1 through the circulating water pump 2 for heat exchange, and then flows back to the capillary network through the valve 3 after being cooled to complete the circulation of the cooling water. The capillary network continuously performs circulating heat exchange to reduce the temperature of the wall surface, performs radiation refrigeration to reduce the temperature of the bin and the temperature of grains, and maintains the low-temperature state in the bin.

The forced axial flow fan 5 is used for feeding cold air into the bin in winter to reduce the environment in the bin and the temperature of grains, is connected with the air inlet pipe 11, and supplies air into the bin through the ventilation ground slot 7 and then into the air outlet pipe 12 after flowing fully; the press-in axial flow fan 5 is used for sending air in the granary out of the granary and is connected with the air outlet pipe 12; the method comprises the steps of utilizing low-temperature climate conditions to cool, ventilate and store cold for a warehouse in winter, opening the press-in type axial flow fan 5 and the axial flow fan 6, supplying air by time intervals and with small air quantity by the press-in type axial flow fan 5, enabling the air to pass through a grain pile through the ventilation ground groove 7 to cool grains, discharging the air out of the warehouse through the air outlet air pipe 12 by the axial flow fan 6, and effectively reducing the temperature of the grain in the warehouse by stably utilizing a natural cold source through improvement of a ventilation mode.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A granary low-temperature grain storage system utilizing a capillary network is characterized by comprising a granary, an air heat source pump (1), a capillary network pipe (9), a circulating pipeline (4), a press-in type axial flow fan (5), a ventilation ground groove (7) and an axial flow fan (6); the air heat source pump (1) is arranged outside the granary; one end of the circulating pipeline (4) is connected with the air heat source pump (1), and the other end of the circulating pipeline is connected with the capillary network pipe (9) in the granary; the capillary net pipes (9) are uniformly distributed on the top and the inner wall of the periphery of the granary; the press-in type axial flow fan (5) is arranged outside the granary; the ventilation ground grooves (7) are uniformly distributed at the bottom of the granary and below the grain pile and are connected with the forced axial flow fan (5); the axial flow fan (6) is connected with the granary.

2. The granary low-temperature grain storage system utilizing the capillary network according to claim 1, wherein a circulating water pump (2) and a valve (3) are arranged on the circulating pipeline (4).

3. The granary low-temperature grain storage system utilizing the capillary network according to claim 1, wherein a thermal insulation layer (10) is arranged between the capillary network pipe (9) and the inner wall of the granary.

4. The granary low-temperature grain storage system utilizing the capillary network according to claim 1, wherein an air outlet of the press-in type axial flow fan (5) is connected with an air inlet pipe (11); the other end of the air inlet pipe (11) penetrates through the granary and is connected below the ventilation ground groove (7).

5. The granary low-temperature grain storage system utilizing the capillary network according to claim 1, wherein fine ventilation holes are uniformly formed in the upper surface of the ventilation ground groove (7).

6. The granary low-temperature grain storage system using the capillary network according to claim 1, wherein the capillary network pipe (9) is provided with a dewing-proof coating (8) on the inner side.

7. The granary low-temperature grain storage system utilizing the capillary network according to claim 6, wherein an air outlet pipe (12) is arranged in the anti-condensation coating (8), and one end of the air outlet pipe (12) is higher than the grain pile.

8. The granary low-temperature grain storage system using the capillary network according to claim 7, wherein the other end of the outlet air pipe (12) penetrates through the granary and is connected with the suction opening of the axial flow fan (6).