A new type of variable cross-section pipe ventilation system at the bottom of the granary

Abstract

The present invention relates to a novel variable-section pipeline ventilation system at the bottom of a granary, comprising a ventilation structure component, a partition net and an air supply pipeline device; the ventilation structure component is located in the middle area between the partition net and the ground, and realizes the processing of the incoming air, and the wind is uniformly passed into the grain pile; the partition net is located between the ventilation structure component and the grain pile to isolate the upper grain pile from the lower ventilation system; the air supply pipeline device is connected to the ventilation structure component to provide incoming air for the ventilation structure component. Compared with the prior art, the novel variable-section pipeline ventilation system at the bottom of a granary of the present invention effectively enhances the intensity of airflow exchange, and the ventilation scheme selection is more flexible; the pipeline fault area and fault type can be accurately judged through the monitoring data of the air pressure sensor; the air supply of the ventilation duct can be fully intelligently controlled through the remote and precise control of the electric valve, and the electrification and intelligence level of the ventilation system can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of heat exchange, and in particular relates to a novel variable-section pipeline ventilation system at the bottom of a granary. Background Art

[0002] Mechanical ventilation is used to ventilate and cool grain piles. After long-term experiments and practical applications, it has been confirmed that it can effectively reduce the probability of pests and improve the quality of stored grain. The layout and design of ventilation ducts will affect the ventilation process and ventilation quality, and ventilation quality determines the ventilation effect. Therefore, research and improvement on the layout and design of ventilation ducts is very necessary.

[0003] The traditional ventilation duct layout is cage-type, designed in an arranged or U-shape, and directly placed on the ground at the bottom of the silo, with the top and sides directly covered by grains. The traditional ventilation duct layout is simple and convenient, but it is easy to form ventilation dead corners at the bottom of the silo in medium and large silos, and it is impossible to fully and effectively ventilate the grain on the bottom. At present, new ventilation ducts are usually designed as three-dimensional structures, directly arranged in the center of the grain pile or arranged around the middle. This type of design effectively improves the ventilation processing efficiency and improves the overall flow effect of ventilation in the grain pile to a certain extent. However, due to the complex design of the duct and the arrangement in the middle of the grain pile, there are often difficulties in arrangement, which affects the efficiency of grain entering and exiting the silo, and the problem of needing to be rearranged each time entering and exiting the silo. Summary of the invention

[0004] The purpose of the present invention is to provide a new variable-section pipe ventilation system at the bottom of a granary, so as to realize simple and convenient ventilation pipe layout, low cost, long service life, automatic detection of pipe faults, and ensure uniform air outlet at the bottom of the granary; at the same time, with the unique pipe design and air inlet pipe layout, local ventilation can be achieved and the ventilation function can be enhanced in key areas.

[0005] The technical solution to achieve the purpose of the present invention is: a new variable-section pipe ventilation system at the bottom of a granary, including a ventilation structure component, a partition net and an air supply pipe device; the ventilation structure component is located in the middle area between the partition net and the ground, and is used to realize that the partition net is located between the ventilation structure component and the grain pile to isolate the upper grain pile from the ventilation system below; the air supply pipe device is connected to the ventilation structure component to provide air intake for the ventilation structure component.

[0006] Furthermore, the ventilation structure assembly includes a removable blocking plate, a pipe mouth, a front-end air pressure sensor, a porous medium filler, a variable-section pipe, a middle-end air pressure sensor, a support column and a rear-end air pressure sensor; the variable-section pipes are arranged parallel to each other and parallel to the horizontal plane, the pipe mouth extends out of the granary, the removable blocking plate is selectively installed at the pipe mouth, the surface of the variable-section pipe is completely wrapped by the porous medium filler, the support column is installed in the porous medium filler, and the upper and lower ends of the support column are directly connected to the partition net and the ground; the front-end air pressure sensor, the middle-end air pressure sensor and the rear-end air pressure sensor are respectively arranged in the front section, the middle section and the rear section of the inner wall of each ventilation pipe.

[0007] Furthermore, the variable cross-section pipeline is divided into a front section - a section with enlarged pipe cross-section, a middle section - a section with the same pipe cross-section, and a rear section - a section with reduced pipe cross-section, which is used to reduce the range of changes in wind speed and air pressure in the pipeline.

[0008] Furthermore, ventilation holes are evenly distributed on the wall of the variable-section pipeline.

[0009] Furthermore, the variable-section pipe is divided into three working states, namely: closed state - removable blocking plates are installed at both ends of the pipe openings, which is used for local ventilation operation of the system; single-sided air intake state - a removable blocking plate is installed at one end of the pipe and not at the other end, which is used for single-sided air intake operation of the pipe; double-sided air intake state - when removable blocking plates are not installed at both ends of the pipe, it is used for double-sided air intake operation of the pipe.

[0010] Furthermore, four support columns are located at the four corners of the granary, two are located in the middle of the side of the granary wall, and the remaining support columns are arranged in the porous medium filler with variable cross-section pipes as intervals to support the partition and the grain pile.

[0011] Furthermore, the proportion of the pore space volume inside the porous medium to the total volume of the porous medium is not less than 35%.

[0012] Furthermore, the air supply pipeline device includes a blower, a blower adapter, an air supply main pipe, an air supply branch pipe, an electric valve, and an air vent. The blower and the air supply main pipe are connected by a flange on the blower adapter. Nine air supply branches are connected in parallel to the air supply main pipe. The ends of the air supply branches are connected to the pipeline openings. Electric valves are installed at the ends of the air supply main pipe and in the middle of the air supply branch pipes.

[0013] Furthermore, the electric valve supports remote control.

[0014] Compared with the prior art, the present invention has the following significant advantages:

[0015] Through the variable cross-section pipeline design, it is possible to reduce the difference in air flow velocity and air pressure in the front, middle and rear areas of the pipeline, slow down the rate of decrease of the flow velocity curve, and maintain a linear relationship between air pressure and flow velocity in the front, middle and rear areas of the pipeline;

[0016] (1) By placing air pressure sensors in the front, middle and back areas of each pipeline, the air flow conditions inside the ventilation duct can be obtained in real time. The blower air intake intensity can be dynamically adjusted according to the relevant parameters. At the same time, the difference between the air pressure at the three air pressure sensors and the pressure drop fitting line can be used to accurately determine the pipeline fault area and fault type;

[0017] (2) The air flows out of the pipe and passes through the gaps between the porous medium filler particles. Due to the disordered distribution of the gaps, the airflow exchange intensity is effectively enhanced, ensuring that the airflow velocity on the same cross section remains consistent, and ensuring uniform ventilation at the bottom of the granary;

[0018] (3) The use of a removable blocking plate in conjunction with a double-opening pipe design can realize the working state of the pipe, adding a double-opening air inlet state and a closed state to the original single-opening air inlet state, providing more flexible options for ventilation work plans and facilitating the cleaning of blockages inside the pipe;

[0019] (4) Electric valves are designed at the end of each air supply branch pipe and air supply main pipe to realize remote precision control and fully intelligent control of the air supply of the ventilation duct, thereby improving the electrification and intelligence level of the ventilation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The exterior view of the granary for the layout of the new granary bottom variable cross-section pipe ventilation system;

[0021] Figure 2 This is a partial cross-sectional view of the variable-section pipeline ventilation system at the bottom of a new type of granary;

[0022] Figure 3 This is a cross-sectional view of the ventilation layer of the variable-section pipeline ventilation system at the bottom of a new type of granary;

[0023] Figure 4 Schematic diagram of air delivery pipeline device supporting ventilation system;

[0024] In the figure: 1-removable blocking plate; 2-pipe opening; 3-upper air pressure sensor; 4-porous medium filler; 5-variable cross-section pipe; 6-middle air pressure sensor; 7-support column; 8-lower air pressure sensor; 11-grain pile; 12-separation net; 13-ground; 14-silo wall; 15-silo roof; 21-air supply branch pipe; 22-electric valve; 23-air vent; 24-air supply main pipe; 25-blower transfer pipe; 26-blower; DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0026] This embodiment is a novel variable cross-section pipeline ventilation system at the bottom of a granary. Figure 1 and Figure 2They are respectively the overall appearance diagram and the partial cross-sectional diagram of the variable cross-section pipeline ventilation system. Thus, the variable cross-section pipeline ventilation system at the bottom of the granary includes a ventilation structure component, a partition 12 and an air supply pipeline device. The ventilation structure component is located in the middle area between the partition 12 and the ground 13, and the partition 12 is located above the ventilation structure component and below the grain pile 11. The partition 12 is used to isolate the upper grain pile 11 from the ventilation system below, and at the same time has good air permeability to facilitate the passage of air supply airflow; the air supply pipeline device is connected to the ventilation structure component. When the air is taken in, the air enters the ventilation structure component through the air supply pipeline device, passes through the partition 12 and is directly transported to the bottom of the grain pile to complete the air supply processing and transportation process.

[0027] like Figure 3 As shown, the ventilation structure assembly includes a removable blocking plate 1, a pipe opening 2, a front air pressure sensor 3, a porous medium filler 4, a variable cross-section pipe 5, a middle air pressure sensor 6, a support column 7 and a rear air pressure sensor 8. The variable cross-section pipes 5 are arranged parallel to each other and parallel to the horizontal plane. The upper and lower opening ends of the pipes, namely the pipe openings 2, extend out of the granary. The removable blocking plate 1 is selectively installed at the pipe opening 2. The surface of the variable cross-section pipe 5 is completely wrapped by the porous medium filler 4. The support column 7 is as shown in FIG. Figure 3 As shown in the arrangement, there are 22 support columns 7, 4 of which are located at the four corners of the granary, two are located in the middle of the side of the granary wall, and the remaining support columns 7 are arranged in the porous medium filler 4 with variable-section pipes 5 as intervals. Their function is to support the partition net and the grain pile and reduce the pressure of the grain pile on the porous medium filler 4 and the variable-section pipe 5; the upper and lower ends of the support columns 7 are directly connected to the partition net 12 and the ground 13; the front section, middle section, and rear section of the inner wall of each ventilation duct are respectively equipped with a front-end air pressure sensor 3, a mid-end air pressure sensor 6, and a rear-end air pressure sensor 8, and the air pressure sensor can be used to accurately and real-timely know the working conditions of the intake air at different sections of the pipeline.

[0028] In the variable cross-section pipe ventilation system at the bottom of the granary of this embodiment, the working states of the variable cross-section pipe 5 are divided into three types, which are adjusted by the removable blocking plate 1; when the removable blocking plates 1 are installed at both ends of the pipe openings 2, the pipe is in a closed state, which is suitable for local ventilation operation of the system; when the removable blocking plate 1 is installed at one end of the pipe and not installed at the other end, it is suitable for single-side air intake operation of the pipe; when the removable blocking plates 1 are not installed at both ends of the pipe, it is suitable for double-side air intake of the pipe to enhance ventilation operation;

[0029] In the variable cross-section pipeline ventilation system at the bottom of the granary of this embodiment, the variable cross-section pipeline 5 is divided into a front section - a pipe cross-section enlarged section, a middle section - a pipe cross-section identical section, and a rear section - a pipe cross-section reduced section, and ventilation holes are evenly distributed on the pipe walls of the front, middle and rear sections. In the commonly used single-sided pipe air intake mode, when the wind enters the pipe cross-section enlarged section of the variable cross-section pipeline 5, the wind speed decreases and the air pressure increases, thereby ensuring the wind speed in the pipe cross-section reduced section section; in the pipe cross-section identical section, the air pressure drops and the wind speed remains unchanged; in the pipe cross-section reduced section, the air pressure and wind speed drop rate is slowed down due to the reduced flow area; since the incoming air is continuously transported outward through the pipe wall, the variable cross-section design in which the front section pipe cross-section gradually enlarges and the rear section pipe cross-section gradually reduces can effectively reduce the difference in air intake parameters such as flow velocity and air pressure in the front, middle and rear sections of the pipeline, and reduce the problem of rapid reduction in air pressure and flow velocity after the wind enters the pipeline, and makes its changes present a linear relationship; Figure 3 As shown, in the single-side air inlet mode of the pipeline, the blocking plates 1 are staggeredly installed at the pipeline opening 2, so that the open end and the closed end of the ventilation duct are staggered. This arrangement mode effectively enhances the uniformity of the system's air outlet to the bottom layer of the granary, making the wind speed and air pressure at each point on the plane similar.

[0030] In the variable-section pipe ventilation system at the bottom of the granary of the present embodiment, air pressure sensors are arranged at the front section, middle section, and rear section of the inner wall of each ventilation pipe, and the air pressure sensors can accurately know the conditions of the air intake at different sections of the pipe in real time. When in the single-side air intake mode of the pipe, under normal working conditions, the measurement values ​​of all the front-end air pressure sensors 3, the middle-end air pressure sensors 6, and the rear-end air pressure sensors 8 will fluctuate slightly within a certain fixed range; if there is a fault in a certain pipe, the measurement value of the corresponding air pressure sensor will change greatly, so the fault type and fault location can be judged. In addition, according to the internal air pressure value of the pipe measured by the air pressure sensor, the valves of each pipe can be reasonably adjusted to make the air intake conditions inside each pipe similar, so as to ensure that the air outlet at each point is consistent;

[0031] In the variable cross-section pipe ventilation system at the bottom of the granary of this embodiment, the porous medium filler 4 completely fills the space between the variable cross-section pipe 5 and the support column 7 in the ventilation system, while maintaining a certain porosity, that is, ensuring that the volume of the pore space inside the porous medium occupies a certain proportion of the total volume of the porous medium, and the proportion is at least 35%. The wind enters the filler from the wall of the variable cross-section pipe 5. Since the porous medium filler 4 is loose and porous and has disordered pores, the airflow is efficiently and evenly dispersed to the entire space of the ventilation system components, and multiple airflows can be exchanged in real time or asynchronously, which greatly enhances the uniformity of the airflow inside the system, and then flows to the entire granary, improving the ventilation effect of the entire granary.

[0032] The air delivery pipe device in the variable cross-section pipe ventilation system at the bottom of the granary in this embodiment is as follows Figure 4The air delivery pipeline device includes a blower 26, a blower transfer pipe 25, an air delivery main pipe 24, an air delivery branch pipe 21, an electric valve 22, and an air vent 23; the blower 26 and the air delivery main pipe 24 are connected by a flange on the blower transfer pipe 25, and the blower 26 delivers the incoming air to the air delivery main pipe 24 through the transfer pipe 26; the air delivery main pipe 24 is responsible for delivering the incoming air to each air delivery branch pipe 21; nine air delivery branch pipes 21 are connected in parallel to the air delivery main pipe 24, and the ends of the air delivery branch pipes 21 are connected to the pipe opening 2, and the ends of the air delivery main pipe 24 are connected to the air delivery branch pipes 21. An electric valve 22 is installed in the middle. The end opening of the air supply main pipe 24 is an air leakage port 23. The electric valve 22 controls the closing of the air leakage port 23. When a failure occurs in the ventilation system, the electric valve 22 can be opened to discharge the air in the main pipe through the air leakage port 23. This is a safety guarantee device. The electric valve 22 on the air supply branch pipe 21 can adjust the air intake size of the branch pipe 21 or close the pipe to realize the regulation of the air intake volume of the ventilation duct 5 connected to the branch pipe 21. At the same time, because the electric valve 22 supports remote control, it provides convenience for realizing the intelligentization of the ventilation system.

[0033] The variable-section pipe ventilation system at the bottom of the granary in this embodiment is provided with air intake by two sets of air supply pipe devices, which are installed on both sides of the ventilation system respectively; in addition, the two sets of air supply pipe devices can also be combined, and the air intake can be provided by the same blower 26.

[0034] Taking single-sided air intake as an example, the air comes out of the blower, and is transported to the pipe opening 2 where the removable blocking plate 1 is not installed through the air supply main pipe 24 and the air supply branch pipe 21, thereby entering the variable-section pipe 5, and then entering the porous medium filler 4 from the pipe wall, and is evenly dispersed to the entire ventilation structure through the pores of the porous medium. Finally, the wind evenly passes through the partition net 12 and enters the bottom layer of the grain pile 11, completing the entire air intake processing flow.

[0035] Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. However, these obvious changes or modifications derived from the essential spirit of the present invention still fall within the protection scope of the present invention.

Claims

1. A novel variable cross-section pipeline ventilation system at the bottom of a granary, characterized in that: It includes a ventilation structure component, a partition net and an air delivery pipeline device; the ventilation structure component is located in the middle area between the partition net and the ground, and is used to process the incoming air and pass the air into the grain pile after it is uniformized; the partition net is located between the ventilation structure component and the grain pile, and is used to isolate the upper grain pile from the lower ventilation system; the air delivery pipeline device is connected to the ventilation structure component, and is used to provide air intake for the ventilation structure component; The ventilation structure assembly includes a removable blocking plate, a pipe opening, a front-end air pressure sensor, a porous medium filler, a variable-section pipe, a middle-end air pressure sensor, a support column and a rear-end air pressure sensor; the variable-section pipes are arranged in parallel and spaced apart and parallel to the horizontal plane, the pipe opening extends out of the granary, the removable blocking plate is selectively installed at the pipe opening, the surface of the variable-section pipe is completely wrapped by the porous medium filler, the support column is installed in the porous medium filler, and the upper and lower ends of the support column are directly connected to the partition net and the ground; the front section, middle section and rear section of the inner wall of each ventilation pipe are respectively provided with a front-end air pressure sensor, a middle-end air pressure sensor and a rear-end air pressure sensor; the variable-section pipe is divided into a front section - a pipe section enlargement section, a middle section - a pipe section with the same cross-section, and a rear section - a pipe section reduction section, which is used to reduce the range of wind speed and air pressure changes in the pipe.

2. The variable cross-section pipeline ventilation system at the bottom of the granary according to claim 1 is characterized in that: Ventilation holes are evenly distributed on the wall of the variable-section pipe.

3. The variable cross-section pipeline ventilation system at the bottom of the granary according to claim 1 is characterized in that: The variable cross-section pipe is divided into three working states: Closed state - removable blocking plates are installed at both ends of the pipe openings for local ventilation operation of the system; Single-side air intake state: a removable blocking plate is installed at one end of the pipe, and not installed at the other end, which is used for single-side air intake operation of the pipe; Double-side air intake status - when no removable blocking plates are installed at both ends of the pipeline, it is used for double-side air intake operation of the pipeline.

4. The variable cross-section pipeline ventilation system at the bottom of the granary according to claim 1 is characterized in that: Four support columns are located at the four corners of the granary, two are located in the middle of the side of the granary wall, and the remaining support columns are arranged in the porous medium filler with variable cross-section pipes at intervals to support the partition screen and the grain pile.

5. The variable cross-section pipeline ventilation system at the bottom of the granary according to claim 1 is characterized in that: The proportion of the pore space volume inside the porous medium to the total volume of the porous medium is not less than 35%.

6. The variable cross-section pipeline ventilation system at the bottom of the granary according to claim 1 is characterized in that: The air supply pipeline device includes a blower, a blower adapter, an air supply main pipe, an air supply branch pipe, an electric valve, and an air vent. The blower and the air supply main pipe are connected by a flange on the blower adapter. Nine air supply branches are connected in parallel to the air supply main pipe. The ends of the air supply branches are connected to the pipeline openings. Electric valves are installed between the ends of the air supply main pipe and the air supply branch pipes.

7. The variable cross-section pipeline ventilation system at the bottom of the granary according to claim 6 is characterized in that: The electric valve supports remote control.

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