Automatic pressure regulating system for granary

Abstract

The present invention relates to the technical field of granary modification, and discloses an automatic granary pressure regulating system, comprising a main gas pipe installed on the inner wall of the granary, a plurality of pressure regulating devices, the pressure regulating devices comprising a housing and a pipe assembly; the main gas pipe is provided with a plurality of branch pipes, the outer ends of the pipe assemblies in each pressure regulating device being connected to corresponding branch pipes; a piston assembly is provided within the pipe assembly; when the air pressure inside the granary is greater than the air pressure outside the granary, the piston assembly moves along the pipe assembly toward the outer space; when the air pressure inside the granary is less than the air pressure outside the granary, the piston assembly moves along the pipe assembly toward the inner space; when the air pressure inside the granary is equal to the air pressure outside the granary, the piston assembly stops moving. The present invention can conveniently and stably regulate the air pressure inside the granary, prevent or reduce the exchange of gas inside the granary with gas outside the granary, thereby preventing or reducing nitrogen leakage within the granary, thereby maintaining a stable nitrogen concentration and improving the insecticide effect.

Description

Technical Field

[0001] The present invention relates to the technical field of granary transformation, and in particular to an automatic pressure regulating system for a granary. Background Art

[0002] Large grain warehouses contain many large granaries, primarily used for storing grain, wheat, and other crops. To ensure the quality of stored grain, granaries need to be well sealed. However, due to their large size, for example, the granary in the applicant's granary is approximately 40 meters long, 20 meters wide, and 8 meters high (of which the grain pile is 6 meters high). The volume of gas inside the granary (excluding the grain pile) is approximately 1,600 cubic meters. Given its large size, it is difficult to achieve absolute sealing. When the temperature inside the granary rises, causing the air pressure to increase, the gas inside the granary will be discharged through various gaps. When the temperature inside the granary drops, outside air will enter the granary, maintaining a balance between the air pressure inside and outside the granary. Even if the granary is equipped with a temperature control system, it can only control the temperature within a certain range and cannot maintain a completely constant temperature. Therefore, the air pressure inside the granary also fluctuates within a certain range.

[0003] When pest control is normally performed on grain stored in a granary, nitrogen is usually introduced into the grain pile through the wind network system inside the granary. Effective pest control can only be achieved when the nitrogen concentration inside the granary stabilizes at a preset value. However, due to temperature fluctuations inside the granary, the gas inside the granary is constantly exchanged with the outside air. When the temperature inside the granary rises, the nitrogen inside the granary is discharged from various gaps. When the temperature inside the granary drops, the air outside the granary enters the granary to compensate. The entry of outside air into the granary causes the nitrogen concentration inside the granary to decrease, making it difficult to stabilize the nitrogen concentration inside the granary at an effective sterilization concentration, thereby affecting the pest control effect. In order to maintain the nitrogen concentration inside the granary, the nitrogen generator needs to work continuously for a long time and at a high load to supply high-concentration nitrogen to the granary to compensate for the decrease in nitrogen concentration inside the granary. This will increase the energy consumption of the nitrogen generator and also affect the service life of the nitrogen generator. Summary of the Invention

[0004] In order to solve the above-mentioned problems in the prior art, the present invention provides an automatic pressure regulating system for a granary; when the temperature inside the granary changes, the system can automatically adjust the internal pressure of the granary, and at the same time prevent or reduce the flow exchange between the gas inside the granary and the gas outside the granary, prevent or reduce the leakage of nitrogen in the granary, and prevent or reduce the external air from entering the granary to reduce the nitrogen concentration, thereby maintaining a stable nitrogen concentration in the granary to achieve a good insecticide state.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An automatic pressure regulating system for a grain silo includes a main air pipe installed on the inner wall of the grain silo, and several pressure regulating devices installed inside the grain silo and located in the space above the grain pile. The pressure regulating devices include a housing and a pipe assembly arranged within the housing, with both ends of the pipe assembly extending outside the housing.

[0007] The two ends of the main gas pipe are connected to the outside world after passing through the granary. The main gas pipe is provided with a plurality of branch pipes, and the outer ends of the pipe components in each pressure regulating device are connected to the branch pipes accordingly;

[0008] A piston assembly is provided in the pipeline assembly, and the piston assembly divides the space in the pipeline assembly into two independent spaces, wherein the space connected with the interior of the granary is the inner space, and the space connected with the outside of the granary is the outer space; when the air pressure inside the granary is greater than the air pressure outside the granary, the piston assembly moves along the pipeline assembly to the outer space; when the air pressure inside the granary is less than the air pressure outside the granary, the piston assembly moves along the pipeline assembly to the inner space; when the air pressure inside the granary is equal to the air pressure outside the granary, the piston assembly stops moving.

[0009] During the pest control process in the granary through nitrogen circulation, when the temperature in the granary rises, the air pressure in the granary increases, causing the piston assembly in the pipe assembly to move toward the external space, and the volume in the granary increases (the increased part is the volume of the increased internal space); when the temperature in the granary drops, the piston assembly moves toward the internal space, and the volume of the granary is changed by the movement of the piston assembly, thereby maintaining the air pressure in the granary in a dynamic equilibrium state; since the movement of the piston assembly performs volume compensation, it effectively prevents (or weakens) the direct replacement of nitrogen in the granary with the air outside the granary, so that the nitrogen concentration in the granary can be stably maintained at the concentration required for pest control.

[0010] Preferably, the pipe assembly includes a spiral tube, a first connecting tube disposed at the inner end of the spiral tube, and a second connecting tube disposed at the outer end of the spiral tube, the second connecting tube being connected to the branch tube. A first valve group is disposed at the inner end of the first connecting tube, and a second valve group is disposed between the second connecting tube and the branch tube. The spiral tube is long and has a large internal volume, which can compensate for a larger volume, thereby achieving pressure regulation in the grain silo.

[0011] Preferably, the piston assembly includes two flexible piston bodies, forming a closed medium cavity between the two piston bodies, and the medium cavity is filled with lubricating grease that is liquid at room temperature; an annular groove is provided on the circumferential surface of the piston body, and the edges of the piston body are provided with rounded chamfers. A rigid piston is difficult to move within the spiral tube, while the edges of the flexible piston have elastic deformation capabilities and cooperate with the rounded chamfers to enable the piston body to move within the curved spiral tube; the medium cavity between the two piston bodies is filled with lubricating grease, which not only acts as a liquid seal to prevent gas flow between the inner and outer spaces, but also reduces the movement resistance of the piston body within the spiral tube.

[0012] Preferably, the piston bodies are both fixed with connecting pieces, a cable is provided between the connecting pieces in the two piston bodies, and one of the piston bodies is provided with a one-way oiling nozzle for injecting grease into the medium cavity.

[0013] Preferably, a piston reset mechanism is provided between the first connecting pipe and the second connecting pipe; the piston reset mechanism comprises a flow guide pipe and an air pump provided on the flow guide pipe, one end of the flow guide pipe is connected to the side surface of the first connecting pipe, and the other end of the flow guide pipe is connected to the side surface of the second connecting pipe, and a third valve group is provided on the flow guide pipe;

[0014] When the granary does not need pressure regulation, the first and second valve groups are closed, and the third valve group and air pump are opened. The air pump controls the pressure difference between the inner and outer spaces, thereby controlling the piston assembly to move into the first or second connecting pipe. After the pressure regulation system is used, the piston assembly in each pressure regulating device stops at a random position, and the screw plug assembly needs to be reset after use. Some pressure regulating devices turn on the air pump to pump gas from the inner space into the outer space, causing the piston assembly to move into the first connecting pipe. Other pressure regulating devices pump gas from the outer space into the inner space, causing the piston assembly to move into the second connecting pipe, making it easier to use the next time.

[0015] Preferably, a retaining ring for limiting the position of the piston assembly is provided in each of the first and second connecting tubes. Proximity sensors for detecting the piston assembly are also provided in each of the first and second connecting tubes. Both piston bodies are provided with sensing elements compatible with the proximity sensors. During the resetting process of the piston assembly, when the corresponding proximity sensor detects a signal from the sensing block, it indicates that the piston assembly has been reset.

[0016] Preferably, the proximity sensor is coaxially mounted in the first connecting tube and the second connecting tube via a connecting bracket, the sensing element is a columnar structure, one end of the sensing element is fixedly connected to the connecting element, and the other end of the sensing element is provided with a convex ring, and the first connecting tube and the second connecting tube are both provided with a limit assembly;

[0017] The limiter assembly includes a lifting power source and a limiter rod connected to the lifting power source. A limiter fork is provided at the end of the limiter rod. When the proximity sensor detects the sensing element, the lifting power source drives the limiter rod downward, causing the limiter fork to engage the sensing element and limit the piston assembly. After the piston assembly is reset, the lifting power source drives the limiter rod downward, causing the limiter fork on the limiter rod to engage the sensing block and limit the piston assembly.

[0018] Preferably, the first, second, and third valve groups are all electrically controlled valves, and a first filter assembly is provided at the end of the first valve group. The electrically controlled valve edge is directly controlled remotely, and the first filter assembly can prevent impurities inside the granary from entering the pipeline assembly.

[0019] Preferably, a support frame is provided between the inner walls of the granary facing each other, and the lower end of the shell of the pressure regulating device is mounted on the support frame.

[0020] Preferably, a second filter assembly is provided at both ends of the main gas pipe, and a manual valve is provided on each branch pipe; if the branch pipe is not connected to a pressure regulating device, the manual valve on the branch pipe is in a normally closed state; if the branch pipe is connected to a pressure regulating device, the manual valve on the branch pipe is in a normally open state.

[0021] Therefore, the present invention can conveniently and stably adjust the air pressure in the granary, prevent or reduce the replacement of the gas in the granary with the gas outside the granary, thereby preventing or reducing nitrogen leakage in the granary, and then maintaining a stable nitrogen concentration and improving the insecticidal effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention.

[0023] Figure 2 for Figure 1 Top view of .

[0024] Figure 3 This is a schematic diagram of the connection between the pressure regulating device and the main gas pipe.

[0025] Figure 4 It is a structural diagram of the pressure regulating device.

[0026] Figure 5 A schematic diagram of the pipeline assembly structure.

[0027] Figure 6 This is a diagram showing the state where the piston assembly is limited by the limiting assembly in the first connecting tube (or the second connecting tube).

[0028] Figure 7 for Figure 6 Another perspective of the picture.

[0029] Figure 8Schematic diagram of the structure of the piston assembly.

[0030] In the figure: granary 1, main air pipe 2, branch pipe 20, second filter assembly 21, manual valve 22, pressure regulating device 3, shell 30, pipe assembly 31, spiral tube 310, first connecting pipe 311, retaining ring 3110, proximity sensor 3111, induction element 3112, connecting bracket 3113, convex ring 3114, second connecting pipe 312, first valve group 313, first filter assembly 3130, second valve group 314, limit assembly 315, lifting power 3150, limit rod 3151, limit fork 3152, piston assembly 32, piston body 320, annular groove 3200, chamfer 3201, medium cavity 321, lubricating grease 322, connecting piece 323, cable 324, one-way oiling nozzle 325, piston reset mechanism 33, guide pipe 330, air pump 331, third valve group 332, support frame 4. DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical solutions and beneficial technical effects to be solved by the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and multiple exemplary embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the scope of protection of the present invention.

[0032] It should be understood that, in this document, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance, nor as implicitly specifying the quantity of the technical features being referenced. A feature specified as "first" or "second" may explicitly or implicitly indicate that at least one of the features is included.

[0033] like Figures 1-8 The automatic pressure regulating system of a granary shown in the figure includes a main air pipe 2 installed on the inner wall of the granary 1, and several pressure regulating devices 3 installed inside the granary and located in the space above the grain pile. The pressure regulating device 3 includes a shell 30 and a pipe assembly 31 arranged in the shell, and the two ends of the pipe assembly extend out of the shell; the two ends of the main air pipe 2 are connected to the outside after passing through the granary 1, and the main air pipe 2 is provided with several branch pipes 20. The outer end of the pipe assembly in each pressure regulating device 3 is connected to the branch pipe accordingly. A support frame 4 is provided between the opposite inner walls of the granary 1, and the lower end of the shell of the pressure regulating device is installed on the support frame. A second filter assembly 21 is provided at both ends of the main air pipe 2, and a manual valve 22 is provided on each branch pipe 20; if the pressure regulating device is not connected to the branch pipe, the manual valve on the branch pipe is in a normally closed state, and if the pressure regulating device is connected to the branch pipe, the manual valve on the branch pipe is in a normally open state.

[0034] A piston assembly 32 is provided in the pipe assembly 31. The piston assembly divides the space within the pipe assembly into two independent spaces, wherein the space connected to the interior of the granary is the inner space, and the space connected to the exterior of the granary is the outer space. When the air pressure inside the granary is greater than the air pressure outside the granary, the piston assembly moves along the pipe assembly toward the outer space. When the air pressure inside the granary is less than the air pressure outside the granary, the piston assembly moves along the pipe assembly toward the inner space. When the air pressure inside the granary is equal to the air pressure outside the granary, the piston assembly stops moving.

[0035] The pipe assembly 31 includes a spiral tube 310, a first connecting tube 311 located at the inner end of the spiral tube, and a second connecting tube 312 located at the outer end of the spiral tube. The second connecting tube 312 is connected to the branch tube 20. A first valve group 313 is installed at the inner end of the first connecting tube, and a second valve group 314 is installed between the second connecting tube and the branch tube. In this embodiment, both the first and second valve groups 313 and 314 are electrically controlled valves. A first filter assembly 3130 is installed at the end of the first valve group 313, which uses a mesh plate.

[0036] like Figure 6-Figure 8 As shown, the piston assembly 32 comprises two flexible piston bodies 320, forming a closed medium cavity 321 between the two piston bodies. The medium cavity is filled with lubricating grease 322, which is liquid at room temperature. The circumferential surface of the piston bodies 320 is provided with an annular groove 3200, and the edges of the piston bodies are provided with rounded chamfers 3201. Connectors 323 are fixedly installed in each piston body 320, and a cable 324 is provided between the connectors in the two piston bodies. One of the piston bodies is provided with a one-way grease nozzle 325 for injecting grease into the medium cavity. The piston bodies are made of silicone, and the connectors are metal parts pre-embedded in the piston bodies. The lubricating grease in this embodiment is a non-polluting and non-volatile vegetable oil such as rapeseed oil, peanut oil, or soybean oil.

[0037] like Figure 4 and Figure 5 As shown, a piston reset mechanism 33 is provided between the first connecting tube 311 and the second connecting tube 312. The piston reset mechanism includes a flow guide tube 330 and an air pump 331 mounted on the flow guide tube. One end of the flow guide tube is connected to the side of the first connecting tube, and the other end of the flow guide tube is connected to the side of the second connecting tube. The flow guide tube is also equipped with a third valve group 332. When the granary does not require pressure regulation, the first and second valve groups are closed, and the third valve group and the air pump are opened. The air pump controls the pressure difference between the inner and outer spaces, thereby controlling the movement of the piston assembly into the first or second connecting tube. The third valve group in this embodiment also uses an electrically controlled valve.

[0038] Both the first and second connecting tubes 311 and 312 are equipped with retaining rings 3110 for limiting the position of the piston assembly. Proximity sensors 3111 for detecting the piston assembly are also installed in the first and second connecting tubes. Both piston bodies are equipped with sensing elements 3112 compatible with the proximity sensors. The proximity sensors 3111 are coaxially mounted within the first and second connecting tubes via a connecting bracket 3113. The sensing element 3112 is a columnar structure, one end of which is fixedly connected to the connecting element, and the other end of which is provided with a raised ring 3114. Both the first and second connecting tubes are equipped with limiting assemblies 315. The limiting assemblies 315 include a lifting power 3150 and a limiting rod 3151 connected to the lifting power. A limiting fork 3152 is provided at the end of the limiting rod. When the proximity sensor detects the sensing element, the lifting power drives the limiting rod downward, causing the limiting fork to engage the sensing element and limit the position of the piston assembly. In this embodiment, the lifting power is an electric cylinder.

[0039] In conjunction with the accompanying drawings, the principle of the present invention is as follows: the main gas pipe is installed on the wall of the granary. Those skilled in the art select the corresponding number of pressure regulating devices according to the volume of the granary (the volume outside the grain pile) and the temperature difference range in the granary. The volume of the pipeline assembly in each pressure regulating device is about 1 cubic meter. Figure 1-Figure 3 As shown, in this embodiment, a total of 12 pressure regulating devices are installed in the granary, six of which are as follows Figure 1 The piston assembly is installed in the manner shown, with the reset state located in the first connecting tube; the other six are installed on the opposite side in the same manner, with the reset state of the piston assembly located in the second connecting tube. Therefore, in theory, when the temperature in the granary changes, the volume inside the granary is allowed to change by ±6m³ under the condition of balanced pressure inside and outside the granary.

[0040] When nitrogen is introduced into the granary for insecticide, the first valve group and the second valve group are opened and the third valve group is closed. When the temperature in the granary rises and the air pressure increases, the piston assembly moves toward the outer space to increase the volume of the granary to keep the air pressure stable; when the temperature in the granary drops and the air pressure decreases, the piston assembly moves toward the inner space to reduce the volume of the granary to keep the air pressure stable; in this pressure regulating device, the air pressure inside and outside the granary is kept stable through volume compensation, which greatly reduces the pressure difference between the nitrogen in the granary and the air outside the granary and replaces it, thereby maintaining a stable nitrogen concentration in the granary and maintaining a good insecticide effect.

[0041] After killing insects, when the pressure regulating device is no longer needed to regulate the air pressure in the granary, the piston assembly is located at a random position in the spiral tube. The piston assembly needs to be reset to its initial state for the next use. Specifically: the first valve group and the second valve group are closed, the third valve group and the air pump are opened, and the air pumps in the six pressure regulating devices pump the gas in the inner space into the outer space, so that the piston assembly moves along the inner space into the first connecting pipe. When the pressure sensor detects a signal, the lifting power drives the lifting rod to descend, so that the limit fork is stuck in the sensing part to limit the piston assembly; the air pumps in the other six pressure regulating devices pump the gas in the outer space into the inner space, so that the piston assembly moves to the second connecting pipe and is limited, so as to facilitate the next use.

[0042] In the description of the present invention, it should be understood that the directions or positional relationships indicated by up, down, left, right, inner end, outer end, one end, the other end, etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the purpose of more clearly describing the technical solution of the present invention, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific orientation, and cannot be understood as a limitation of the present invention.

[0043] Although specific embodiments of the present invention are described in detail herein, they are provided for illustrative purposes only and should not be considered to limit the scope of the present invention. Various substitutions, changes, and modifications may be conceived without departing from the spirit and scope of the present invention.

Claims

1. A granary automatic pressure regulating system, characterized in that: The device comprises a main gas pipe installed on the inner wall of the granary, and several pressure regulating devices installed inside the granary and located in the space above the grain pile. The pressure regulating devices include a shell and a pipe assembly arranged in the shell, with both ends of the pipe assembly extending outside the shell. The two ends of the main gas pipe are connected to the outside world after passing through the granary. The main gas pipe is provided with a plurality of branch pipes, and the outer ends of the pipe components in each pressure regulating device are connected to the branch pipes accordingly; The pipe assembly is provided with a piston assembly, which divides the space within the pipe assembly into two independent spaces, wherein the space connected to the interior of the granary is the inner space, and the space connected to the exterior of the granary is the outer space; when the air pressure inside the granary is greater than the air pressure outside the granary, the piston assembly moves along the pipe assembly toward the outer space; when the air pressure inside the granary is less than the air pressure outside the granary, the piston assembly moves along the pipe assembly toward the inner space; when the air pressure inside the granary is equal to the air pressure outside the granary, the piston assembly stops moving; The pipeline assembly includes a spiral tube, a first connecting tube provided at the inner end of the spiral tube, and a second connecting tube provided at the outer end of the spiral tube, wherein the second connecting tube is connected to the branch tube; a first valve group is provided at the inner end of the first connecting tube, and a second valve group is provided between the second connecting tube and the branch tube; The piston assembly includes two flexible piston bodies, a closed medium cavity is formed between the two piston bodies, and the medium cavity is filled with lubricating grease that is liquid at room temperature; an annular groove is provided on the circumferential surface of the piston body, and rounded chamfers are provided at the edges of both ends of the piston body; Connecting pieces are fixedly provided in the piston bodies, and a pulling rope is provided between the connecting pieces in the two piston bodies. A one-way oiling nozzle for injecting grease into the medium cavity is provided in one of the piston bodies.

2. The automatic pressure regulating system for a granary according to claim 1 is characterized in that: A piston reset mechanism is provided between the first connecting pipe and the second connecting pipe; the piston reset mechanism includes a guide pipe and an air pump provided on the guide pipe, one end of the guide pipe is connected to the side of the first connecting pipe, and the other end of the guide pipe is connected to the side of the second connecting pipe, and a third valve group is provided on the guide pipe; When the granary does not need pressure regulation, the first valve group and the second valve group are closed, the third valve group and the air pump are opened, and the air pump controls the pressure difference between the inner space and the outer space, thereby controlling the piston assembly to move into the first connecting pipe or the second connecting pipe.

3. The automatic pressure regulating system for a granary according to claim 2, characterized in that: The first connecting tube and the second connecting tube are both provided with retaining rings for limiting the piston assembly. The first connecting tube and the second connecting tube are both provided with proximity sensors for detecting the piston assembly. Both piston bodies are provided with sensing parts adapted to the proximity sensors.

4. The automatic pressure regulating system for a granary according to claim 3 is characterized in that: The proximity sensor is coaxially mounted in the first connecting tube and the second connecting tube via a connecting bracket. The sensing element is a columnar structure, one end of the sensing element is fixedly connected to the connecting element, and the other end of the sensing element is provided with a convex ring. The first connecting tube and the second connecting tube are both provided with a limit assembly. The limit assembly includes a lifting power and a limit rod connected to the lifting power. A limit fork is provided at the end of the limit rod. When the proximity sensor detects the sensing part, the lifting power drives the limit rod to descend, so that the limit fork is stuck in the sensing part to limit the piston assembly.

5. The automatic pressure regulating system for a granary according to claim 2 is characterized in that: The first valve group, the second valve group and the third valve group are all electrically controlled valves, and a first filter assembly is provided at the end of the first valve group.

6. The automatic pressure regulating system for a granary according to claim 1 is characterized in that: A support frame is provided between the inner walls of the granary facing each other, and the lower end of the shell of the pressure regulating device is installed on the support frame.

7. The automatic pressure regulating system for a granary according to claim 1 is characterized in that: A second filter assembly is provided at both ends of the main gas pipe, and a manual valve is provided on each branch pipe; if the branch pipe is not connected to a pressure regulating device, the manual valve on the branch pipe is in a normally closed state; if the branch pipe is connected to a pressure regulating device, the manual valve on the branch pipe is in a normally open state.

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