Circulation air adjusting device for granary

Abstract

The circulation air conditioning device comprises a first ventilation opening and a second ventilation opening, the first ventilation opening is connected with a first air conditioning pipeline, the second ventilation opening is connected with a second air conditioning pipeline, the second air conditioning pipeline is connected with an exhaust pipeline and a third air conditioning pipeline, and the exhaust pipeline is provided with a strong exhaust fan and a valve F6. A valve F7 is arranged on the exhaust pipeline, the third air-conditioning pipeline is connected with the first air-conditioning pipeline, a circulation fan is arranged between the third air-conditioning pipeline and the second air-conditioning pipeline, a valve F3 is arranged on the third air-conditioning pipeline, and a valve F1 and a valve F2 are arranged on the first air-conditioning pipeline and located on the upstream and the downstream of the third air-conditioning pipeline respectively. And a fourth air-conditioning pipeline is connected between the first air-conditioning pipeline and the exhaust pipeline at the upstream of the strong exhaust fan, and a valve F4 is arranged on the fourth air-conditioning pipeline. According to the circulation air-conditioning device for the granary, the concentration at the bottom of the nitrogen granary and the concentration at the top of the nitrogen granary are uniform through circulation, so that pests at the bottom of the granary are effectively killed.

Description

Technical Field

[0001] The utility model relates to the technical field of modified atmosphere storage of bulk grain, in particular to a circulating modified atmosphere device for a granary. Background Art

[0002] Pests are an important factor affecting the safety of bulk grain storage. The use of nitrogen modified atmosphere technology is an important means to achieve pest control. The modified atmosphere technology refers to using a modified atmosphere device to introduce nitrogen with a corresponding concentration into the warehouse, making the inside of the warehouse in an anoxic state, so as to achieve the purpose of preventing and killing pests.

[0003] The modified atmosphere devices in the prior art have a single function and can only introduce nitrogen into the warehouse in one direction and exhaust in one direction. For example, nitrogen is introduced from the lower side of the grain pile, and corresponding exhaust ports are set on the upper side of the grain pile. When in use, nitrogen enters the granary through the ventilation grooves on the lower side of the grain pile, passes through the grain pile from bottom to top, and is discharged through the exhaust ports on the upper side of the grain pile. The problems existing in the prior art are that during the static storage period of stored grain, due to the relatively small molecular weight of nitrogen, nitrogen mostly accumulates at the top of the warehouse, and the nitrogen concentration at the bottom of the warehouse is relatively low. Therefore, pests often gather at the bottom of the warehouse and the purpose of preventing and killing pests cannot be achieved. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a circulating modified atmosphere device for a granary, which can achieve uniform nitrogen concentration at the bottom and top of the warehouse through circulation, so as to effectively kill pests at the bottom of the warehouse.

[0005] To solve the above technical problems, the technical solution of a circulating modified atmosphere device for a granary in the utility model is as follows:

[0006] A circulating modified atmosphere device for a granary includes a first ventilation port for communicating with the bottom of the grain pile and a second ventilation port for communicating with the upper side of the grain pile. A first modified atmosphere pipeline is connected to the first ventilation port, and the intake end of the first modified atmosphere pipeline is used to connect to a corresponding nitrogen source. A second modified atmosphere pipeline is connected to the second ventilation port, and an exhaust pipeline and a third modified atmosphere pipeline are connected to the second modified atmosphere pipeline. A strong exhaust fan and a valve F6 are arranged on the exhaust pipeline, a valve F7 is arranged on the exhaust pipeline, the third modified atmosphere pipeline is connected to the first modified atmosphere pipeline, a circulating fan is arranged between the third modified atmosphere pipeline and the second modified atmosphere pipeline, a valve F3 is arranged on the third modified atmosphere pipeline, valves F1 and F2 are respectively arranged on the first modified atmosphere pipeline upstream and downstream of the third modified atmosphere pipeline, and a fourth modified atmosphere pipeline is connected between the first modified atmosphere pipeline and the exhaust pipeline upstream of the strong exhaust fan, and a valve F4 is arranged on the fourth modified atmosphere pipeline.

[0007] Furthermore, an intake pipeline communicating with the atmosphere is connected to the upstream of the strong exhaust fan on the exhaust pipeline, and a valve F8 is arranged on the intake pipeline.

[0008] Further, a first intake pipe and a second intake pipe arranged in parallel are connected to the third controlled atmosphere pipe. A valve F9 is provided on the first intake pipe, and a valve F10 is provided on the second intake pipe. The intake ends of the first intake pipe and the second intake pipe are respectively used to be connected to corresponding fumigation gases.

[0009] Further, fumigation application concentration detection boxes for detecting the concentrations of corresponding fumigation gases are provided at the intake ends of the first intake pipe and the second intake pipe.

[0010] Further, a parallel bypass arranged in parallel with the circulation fan is provided between the second controlled atmosphere pipe and the third controlled atmosphere pipe. A valve F9 is provided on the parallel bypass.

[0011] Further, a fifth controlled atmosphere pipe is connected between the first controlled atmosphere pipe and the exhaust pipe downstream of the forced exhaust fan. A valve F5 is provided on the fifth controlled atmosphere pipe.

[0012] Further, the second ventilation opening is connected to the exhaust pipe through a fifth controlled atmosphere pipe. A valve F5 is provided on the fifth controlled atmosphere pipe.

[0013] Further, the circulation controlled atmosphere device for a granary further includes a detection box. A gas concentration and pressure detection unit is provided in the detection box. The gas concentration and pressure detection unit is respectively connected to the first controlled atmosphere pipe, the second controlled atmosphere pipe, and the exhaust pipe through corresponding gas sampling pipes.

[0014] The beneficial effects of the present utility model are as follows: The circulation controlled atmosphere device for a granary of the present utility model can achieve the following multiple functions. For example, 1. "Filling from the bottom and exhausting from the top", that is, nitrogen is filled from the lower side of the grain pile and exhausted from the upper side of the grain pile. Specifically, valves F1, F2, F6, and F7 are opened. Nitrogen flows through the first ventilation opening of the first controlled atmosphere pipe to the lower side of the grain pile, passes through the grain pile from bottom to top, and then is discharged through the second ventilation opening, the second controlled atmosphere channel, and the exhaust pipe. The air flow pressure in the granary is balanced, and the nitrogen concentration continuously increases. 2. "Filling from the top and exhausting from the bottom", that is, nitrogen is filled from the upper side of the grain pile and exhausted from the lower side of the grain pile. Specifically, valve F2 is closed, and valves F1, F3, F4, and F7 are opened. Nitrogen flows through the third controlled atmosphere channel and the second ventilation opening of the second controlled atmosphere channel to the upper side of the grain pile, passes through the grain pile from top to bottom, and then is discharged through the first ventilation opening, the first controlled atmosphere pipe, the fourth controlled atmosphere pipe, and the exhaust pipe. The air flow pressure in the granary is balanced, and the nitrogen concentration continuously increases. 3. Circulation function. After filling nitrogen for a certain period of time, the nitrogen generation system is closed, valves F2 and F3 are opened, the rest of the valves are closed, and the circulation fan is started. Nitrogen flows through the first ventilation opening and the first controlled atmosphere pipe to the third controlled atmosphere pipe, and then flows back to the granary through the second ventilation opening of the second controlled atmosphere pipe, so that the nitrogen concentration in the granary is uniform, avoiding the problem that the effective killing of pests cannot be achieved due to the low nitrogen concentration at the bottom of the grain pile.

[0015] Further, the circulation device for the granary in the present utility model can also achieve the following functions: when the gas sampling pipe detects that the nitrogen concentration in the granary is insufficient, valves F1 and F2 can be opened to supplement gas and circulate gas inside the bin at the same time.

[0016] Further, the airtightness detection function of the bin can also be achieved. Open valves F5 and F8; close valves F2, F4, F6, F7 and the remaining valves. Turn on the forced exhaust fan, and at the same time open the gas detection valve in the detection box to detect the gas pressure concentration inside the bin. By starting and stopping the forced exhaust fan, and opening and closing the valves, combined with the pressure detection and the timing device for the pressure half-life, the control system automatically conducts the positive pressure airtightness detection of the bin. For negative pressure detection, open valves F4 and F7; close valves F2, F5, F6, F8 and the remaining valves. The function is achieved by referring to "positive pressure detection".

[0017] Further, external fumigation and air supply for controlled atmosphere functions can also be connected. Specifically, when the circulation function is turned on, open valves F9 and F10 according to actual needs to access various gases with fumigation, controlled atmosphere and protection functions to achieve this function.

[0018] Further, the ventilation and air change function in a confined space can also be achieved. Open valves F6 and F7; close valves F3, F4, F5, F8 and the remaining valves. At the same time, open the doors and windows such as the inspection opening for the grain condition in the granary. Turn on the forced exhaust fan, start and stop the forced exhaust fan and open and close the valves, combined with the oxygen concentration detection and the fan opening timing device, and the control system automatically conducts air change in the bin to achieve this function.

[0019] Further, the sampling detection function of the gas concentration and gas pressure in the granary can also be achieved through the detection box.

[0020] Further, a parallel bypass is set in parallel with the circulation fan, avoiding the potential safety hazard that the two fans of the forced exhaust fan and the circulation fan are directly connected in series and are likely to cause damage to the fans. Description of the Drawings

[0021] By reading the following detailed description with reference to the drawings, the above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become easy to understand. In the drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, where:

[0022] Figure 1 is the usage state diagram of Embodiment 1 of the present utility model;

[0023] Figure 2It is a schematic structural diagram of the circulating controlled atmosphere device in Embodiment 1;

[0024] Figure 3 It is a schematic structural diagram of the circulating controlled atmosphere device in Embodiment 2;

[0025] 1. First ventilation opening; 2. First controlled atmosphere pipeline; 3. Third controlled atmosphere pipeline; 4. Detection box; 5. Gas sampling pipe; 6. Second ventilation opening; 7. Second controlled atmosphere pipeline; 8. Circulating fan; 9. Exhaust pipeline; 10. Strong exhaust fan; 11. Fourth controlled atmosphere pipeline; 12. Fifth controlled atmosphere pipeline; 13. First intake pipeline; 14. Second intake pipeline; 15. Quick connector; 16. Intake pipeline; 17. Nitrogen generation room; 18. Granary; 19. Circulating controlled atmosphere device; 20. Grain cooling return air duct; 21. Parallel bypass; 22. Concentration detection tube; 23. Quick connector; 24. Fumigation pesticide application concentration detection box; F1, F2, F3, F4, F5, F6, F7, F8, F9 and F10 all represent valves. Detailed implementation manners

[0026] For the convenience of understanding the present utility model, the present utility model will be described in more detail below in conjunction with the drawings and specific embodiments. The preferred embodiments of the present utility model are given in the drawings. However, the present utility model can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosed content of the present utility model more thorough and comprehensive.

[0027] It should be noted that unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the specification of the present utility model are only for the purpose of describing specific embodiments and are not used to limit the present utility model.

[0028] An embodiment of a circulating controlled atmosphere device for a granary in the present utility model is as Figure 1 shown:

[0029] When in use, the circulating controlled atmosphere device is placed at the bottom of the granary 18, and a vertically arranged grain cooling return air duct 20 is provided on the wall of the granary.

[0030] The circulating controlled atmosphere device includes a first ventilation opening 1 for communicating with the bottom of the grain pile and a second ventilation opening 6 for communicating with the upper side of the grain pile. Specifically, the first ventilation opening 1 can be connected to the ventilation groove at the bottom of the grain pile, the second ventilation opening 6 is connected to the bottom of the grain cooling return air duct 20, and the second ventilation opening is connected to the air outlet on the side wall of the granary on the upper side of the grain pile through the grain cooling return air duct.

[0031] A first air duct 2 is connected to the first ventilation opening 1. The intake end of the first air duct 3 is used to be connected to the corresponding nitrogen source, i.e., a nitrogen generation device. In this embodiment, the nitrogen source is a nitrogen generation machine room 17 arranged outside the granary. A second air duct 7 is connected to the second ventilation opening 6. An exhaust duct 9 and a third air duct 3 are connected to the second air duct 7. A strong exhaust fan 10 and a valve F6 are arranged on the exhaust duct 9. A valve F7 is also arranged at the tail end of the exhaust duct. The third air duct 3 is connected to the first air duct 2. A circulation fan 8 is arranged between the third air duct 3 and the second air duct. A valve F3 is arranged on the third air duct. Valves F1 and F2 are respectively arranged on the first air duct 2 upstream and downstream of the third air duct 3. A fourth air duct 11 is connected between the first air duct and the exhaust duct 9 upstream of the strong exhaust fan. A valve F4 is arranged on the fourth air duct. A parallel bypass 21 is arranged between the second air duct and the third air duct in parallel with the circulation fan. A valve F9 is arranged on the parallel bypass.

[0032] The fourth air duct 11 is connected to the exhaust duct 9 downstream of the valve F6.

[0033] An intake duct 16 communicating with the atmosphere is connected to the exhaust duct 9 upstream of the strong exhaust fan 10. A valve F8 is arranged on the intake duct.

[0034] A first intake duct 13 and a second intake duct 14 arranged in parallel are connected to the third air duct 3. The intake ends of the first intake duct and the second intake duct are respectively used to be connected to the corresponding fumigation gases. A valve F9 is arranged on the first intake duct 13. A valve F10 is arranged on the second intake duct 14. During use, the intake ends of the first intake duct and the second intake duct can be introduced with the corresponding air duct gases. The air duct gases can be PH3 generator fumigation gas, CO2 cylinder protection gas, PH3 and CO2 mixed cylinder gas fumigation, sulfuryl fluoride cylinder gas fumigation, or CO2 gas, etc. Fumigation application concentration detection boxes 24 for detecting the concentrations of the corresponding fumigation gases are arranged at the intake ends of the first intake duct and the second intake duct. Quick connectors 15 are connected to the intake ends of the first intake duct and the second intake duct. A concentration detection sensor is arranged in the fumigation application concentration detection box. The concentration detection sensor is connected to the third air duct through a concentration detection tube 22. Concentration detection can be achieved at both the air duct intake port and the tail gas port.

[0035] A fifth air duct 12 is connected between the first air duct 2 and the exhaust duct downstream of the strong exhaust fan. A valve F5 is arranged on the fifth air duct. The fifth air duct is connected to the exhaust duct upstream of the valve F7.

[0036] The circulating air conditioning device for a granary further includes a detection box 4. A gas concentration and pressure detection unit is arranged inside the detection box. The gas concentration and pressure detection unit includes a gas concentration sensor and a pressure detection sensor. The gas concentration and pressure detection unit is respectively connected to the first air conditioning pipeline, the second air conditioning pipeline and the exhaust pipeline through corresponding gas sampling pipes 5. The gas concentration and pressure detection unit is also connected to multiple sampling points inside the granary through a gas sampling pipe. On the basis of retaining the functions of air charging / discharging and pressure detection of the bottom air duct of the grain pile, compared with the traditional airtightness detection device, this device adds the functions of air charging / discharging and pressure detection of the space above the grain surface.

[0037] An embodiment 2 of a circulating air conditioning device for a granary is as Figure 3 shown:

[0038] The difference between embodiment 2 and embodiment 1 is that the fifth air conditioning pipeline 12 is not connected between the first air conditioning pipeline and the exhaust pipeline. The fifth air conditioning pipeline 12 is connected between the second ventilation opening and the exhaust pipeline, and a valve F5 is arranged on the fifth air conditioning pipeline.

[0039] Referring to the analysis of the beneficial effects of the present utility model, through the switching of valves in the present utility model, multiple functions of the circulating air conditioning device can be realized. Especially in the storage environment, the circulation of nitrogen can be achieved, so as to achieve the uniform distribution of nitrogen in the grain pile and avoid the problem that the nitrogen concentration is too low at the lower side of the grain pile to effectively kill pests.

[0040] In the above description of this specification, unless otherwise clearly specified and limited, terms such as "fixed", "installed", "connected" or "coupled" should be understood in a broad sense. For example, in terms of the term "connected", it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components or the interaction relationship between two components. Therefore, unless otherwise clearly limited in this specification, those skilled in the art can understand the specific meanings of the above terms in the present utility model according to specific situations.

[0041] Based on the above description of this specification, those skilled in the art can also understand the terms used as follows. For example, terms indicating orientation or positional relationship such as "upper", "lower", "front", "rear", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "center", "longitudinal", "transverse", "clockwise" or "counterclockwise", etc. are based on the orientation or positional relationship shown in the drawings of this specification. It is only for the purpose of facilitating the description of the solution of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operated in the specific orientation. Therefore, the above terms of orientation or positional relationship cannot be understood or interpreted as a limitation to the solution of the present invention.

[0042] In addition, the terms "first" or "second" etc. used in this specification to refer to numbers or ordinals are only for descriptive purposes and cannot be understood as explicitly or implicitly indicating relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this specification, the meaning of "a plurality of" is at least two, such as two, three or more, etc., unless otherwise specifically defined.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements for some of the technical features. And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A circulating air conditioning device for a granary, comprising a first ventilation opening for communicating with the bottom of the grain pile and a second ventilation opening for communicating with the upper side of the grain pile, characterized in that: A first modified atmosphere pipeline is connected to the first ventilation opening. The air inlet end of the first modified atmosphere pipeline is used to be connected to a corresponding nitrogen source. A second modified atmosphere pipeline is connected to the second ventilation opening. An exhaust pipeline and a third modified atmosphere pipeline are connected to the second modified atmosphere pipeline. A forced exhaust fan and a valve F6 are arranged on the exhaust pipeline. A valve F7 is arranged on the exhaust pipeline. The third modified atmosphere pipeline is connected to the first modified atmosphere pipeline. A circulation fan is arranged between the third modified atmosphere pipeline and the second modified atmosphere pipeline. A valve F3 is arranged on the third modified atmosphere pipeline. Valves F1 and F2 are respectively arranged on the first modified atmosphere pipeline upstream and downstream of the third modified atmosphere pipeline. A fourth modified atmosphere pipeline is connected between the first modified atmosphere pipeline and the exhaust pipeline upstream of the forced exhaust fan. A valve F4 is arranged on the fourth modified atmosphere pipeline.

2. The circulating air conditioning device for granaries according to claim 1, characterized in that: An intake pipeline communicating with the atmosphere is connected to the exhaust pipeline upstream of the forced exhaust fan. A valve F8 is arranged on the intake pipeline.

3. The circulating air conditioning device for grain storage according to claim 1, characterized in that: A first intake pipeline and a second intake pipeline arranged in parallel are connected to the third modified atmosphere pipeline. A valve F9 is arranged on the first intake pipeline. A valve F10 is arranged on the second intake pipeline. The air inlet ends of the first intake pipeline and the second intake pipeline are respectively used to be connected to corresponding fumigation gases.

4. The circulation air conditioning device for grain storage according to claim 3, characterized in that: Fumigation application concentration detection boxes for detecting the concentrations of the corresponding fumigation gases are arranged at the air inlet ends of the first intake pipeline and the second intake pipeline.

5. The circulating air conditioning device for a granary according to claim 1, characterized in that: A parallel bypass arranged in parallel with the circulation fan is arranged between the second modified atmosphere pipeline and the third modified atmosphere pipeline. A valve F9 is arranged on the parallel bypass.

6. The circulating air conditioning device for granary according to claim 1, characterized in that: A fifth modified atmosphere pipeline is connected between the first modified atmosphere pipeline and the exhaust pipeline downstream of the forced exhaust fan. A valve F5 is arranged on the fifth modified atmosphere pipeline.

7. The circulating air conditioning device for a granary according to claim 1, characterized in that: The second ventilation opening and the exhaust pipeline are connected through a fifth modified atmosphere pipeline. A valve F5 is arranged on the fifth modified atmosphere pipeline.

8. The circulating air conditioning device for grain storage according to any one of claims 1 to 7, characterized in that: The circulation modified atmosphere device for a granary further includes a detection box. A gas concentration and pressure detection unit is arranged in the detection box. The gas concentration and pressure detection unit is respectively connected to the first modified atmosphere pipeline, the second modified atmosphere pipeline and the exhaust pipeline through corresponding gas sampling pipes.

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