A nitrogen charging system for a tobacco stack

Abstract

The utility model discloses a kind of nitrogen filling systems of smoke pile, comprising: sealing cover, for cover and be equipped with first air inlet and first air outlet in the outside of smoke pile;Nitrogen module is for generating nitrogen and is equipped with nitrogen outlet, and generated nitrogen is exported from nitrogen outlet;Air extraction module is for extracting gas from sealing cover, and air extraction module is equipped with air extraction port;Air inlet control unit includes second air inlet and second air outlet, second air inlet is detachably connected with nitrogen outlet, second air outlet is detachably connected with first air inlet, and the bottom of air inlet control unit is equipped with moving wheel;Air extraction control unit includes third air inlet and third air outlet, third air inlet is detachably connected with first air outlet, third air outlet is detachably connected with air extraction port, and the bottom of air extraction control unit is equipped with moving wheel.The utility model is convenient for nitrogen filling to multiple positions, and improves nitrogen filling efficiency.

Description

Technical Field

[0001] This utility model relates to the field of tobacco technology, and in particular to a nitrogen filling system for tobacco stacks. Background Technology

[0002] Tobacco leaves require 12-36 months of storage and maintenance before use to complete the natural aging process, reduce the green and pungent odors, and improve the quality of the tobacco. During tobacco storage, tobacco leaves are susceptible to pests such as tobacco beetles and tobacco mealybugs. Traditional chemical control methods, such as phosphine fumigation, pose risks of pesticide residues and threats to the environment and operator safety. Currently, one method is to eliminate pests by reducing oxygen levels through nitrogen filling. This method involves first covering the tobacco stacks with a membrane cover, or covering the entire shelf used to store the tobacco leaves with a membrane cover. Then, a high concentration of nitrogen is injected into the membrane cover using a nitrogen generator to reduce the oxygen content in the tobacco storage environment. This low-oxygen environment is then maintained for a period of time to eliminate pests within the tobacco bins. Nitrogen filling technology, as a green and environmentally friendly physical control method, can effectively kill pests and inhibit mold growth. However, existing nitrogen filling equipment can only automatically fill a single location of the tobacco stack, resulting in low efficiency. Utility Model Content

[0003] The purpose of this invention is to solve the problem that existing nitrogen-filling equipment can only fill nitrogen at a single location in a chimney. This invention provides a nitrogen-filling system for chimneys that facilitates nitrogen filling at multiple locations, thereby improving nitrogen-filling efficiency.

[0004] To solve the above-mentioned technical problems, the present invention provides a nitrogen filling system for smokestacks, comprising:

[0005] A sealing cover is installed on the outside of the smoke stack, and the sealing cover is provided with a first air inlet and a first air outlet;

[0006] The nitrogen generation module is used to generate nitrogen gas and has a nitrogen gas outlet, from which the generated nitrogen gas is output.

[0007] The extraction module is used to extract gas from the sealed cover, and the extraction module is equipped with an extraction port;

[0008] An air intake control unit is movably installed between the nitrogen generation module and the smoke stack. The air intake control unit includes a second air inlet and a second air outlet. The second air inlet is detachably connected to the nitrogen outlet, and the second air outlet is detachably connected to the first air inlet. The nitrogen output from the nitrogen outlet can enter the sealed cover through the air intake control unit. The bottom of the air intake control unit is equipped with casters.

[0009] The exhaust control unit is movably installed between the smoke stack and the exhaust module. The exhaust control unit includes a third air inlet and a third air outlet. The third air inlet is detachably connected to the first air outlet, and the third air outlet is detachably connected to the exhaust port. The gas inside the sealing cover can be output to the outside of the sealing cover through the exhaust control unit. The bottom of the exhaust control unit is equipped with casters.

[0010] According to another specific embodiment of the present invention, the intake control unit includes:

[0011] The ventilation pipe has a second air inlet and a second air outlet at its two ends.

[0012] The first valve is located on the venting line and is used to control the opening and closing of the venting line;

[0013] The first detection module is used to detect the temperature, humidity, pressure and oxygen concentration inside the sealed cover;

[0014] The first control unit is electrically connected to the first detection module and the first valve. The first control unit is used to receive the temperature, humidity, pressure and oxygen concentration detected by the first detection module, and send a first switching signal to the first valve.

[0015] According to another specific embodiment of the present invention, the first detection module includes a temperature and humidity detection sensor, an oxygen concentration sensor, and a first pressure sensor.

[0016] According to another specific embodiment of this utility model, the sealing cover is further provided with a first detection port and a second detection port. The first detection port is provided with a first detection tube, which is used to connect to a first pressure sensor, capable of detecting the air pressure inside the first detection tube. The second detection port is provided with a second detection tube.

[0017] The intake control unit also includes:

[0018] The gas storage box, temperature and humidity detection sensor and oxygen concentration sensor are all located inside the gas storage box, and the second detection tube is connected to the gas storage box;

[0019] An air pump has an air intake end, which is connected to an air storage box.

[0020] According to another specific embodiment of the present invention, a central control unit is also provided. The central control unit is connected to the first control unit via a wireless network, and the central control unit is used to receive the first switch signal.

[0021] According to another specific embodiment of the present invention, the air extraction control unit includes:

[0022] The suction pipe has a third air inlet and a third air outlet at its two ends.

[0023] The second valve is located on the extraction pipe and is used to control the opening and closing of the extraction pipe.

[0024] The second detection module is used to detect the pressure inside the sealing cover;

[0025] The second control unit is electrically connected to the second detection module and the second valve. The second control unit is used to receive the pressure detected by the second detection module and send a second switching signal to the second valve.

[0026] According to another specific embodiment of the present invention, the second detection module includes a second pressure sensor.

[0027] According to another specific embodiment of the present invention, the sealing cover is further provided with a third detection port, and the third detection port is provided with a third detection tube. The third detection tube is connected to a second pressure sensor, and the second pressure sensor can detect the air pressure in the third detection tube.

[0028] According to another specific embodiment of the present invention, both the air intake control unit and the air extraction control unit include a cabinet, and the cabinet is provided with casters at the bottom.

[0029] According to another specific embodiment of this utility model, the movable wheels are located at the four corners of the cabinet, and the movable wheels are omnidirectional wheels.

[0030] This utility model provides a nitrogen-filling system for tobacco stacks. Movable air intake control units and air extraction control units are respectively installed on both sides of the tobacco stack. By detachably connecting the air extraction control unit to the air extraction module and the tobacco stack, a vacuum can be created in the tobacco stack. Similarly, by detachably connecting the air intake control unit to the nitrogen generation module and the tobacco stack, nitrogen can be injected into the tobacco stack. This separation of the air intake control unit at the nitrogen generation module end and the air extraction control unit at the air extraction module end to form a separate control unit reduces the weight and size of the unit and facilitates its movement. When nitrogen filling is required, the control unit can be moved to the desired location to perform the filling operation. This allows the control unit to be moved to various warehouses, any floor, storage area, and stack location for nitrogen filling and pest control. Furthermore, during the resting period of the tobacco stack, nitrogen filling can be performed on other tobacco stacks, improving work efficiency. Attached Figure Description

[0031] Figure 1 This diagram shows a structural block diagram of a nitrogen-filled smokestack system according to an embodiment of the present invention.

[0032] Figure 2 This diagram shows a structural schematic of a nitrogen-filled smokestack system according to an embodiment of the present invention. Detailed Implementation

[0033] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0034] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0036] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0037] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0038] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0039] like Figure 1 and Figure 2As shown, an embodiment of this utility model provides a nitrogen-filling system for tobacco stacks to kill insects. In this embodiment, the nitrogen-filling system for tobacco stacks includes:

[0040] A sealing cover 1 is installed on the outside of the smoke stack to seal it. The sealing cover 1 is provided with a first air inlet and a first air outlet.

[0041] Nitrogen generation module 2 is used to generate nitrogen and has a nitrogen outlet, from which the generated nitrogen is output.

[0042] The extraction module 3 is used to extract gas from the sealing cover 1. The extraction module 3 is provided with an extraction port.

[0043] The air intake control unit 4 is movably installed between the nitrogen generation module 2 and the smoke stack. The air intake control unit 4 includes a second air inlet and a second air outlet. The second air inlet is detachably connected to the nitrogen outlet, and the second air outlet is detachably connected to the first air inlet. The nitrogen output from the nitrogen outlet can enter the sealing cover 1 through the air intake control unit 4. The bottom of the air intake control unit 4 is equipped with casters.

[0044] The exhaust control unit 5 is movably installed between the smoke stack and the exhaust module 3. The exhaust control unit 5 includes a third air inlet and a third air outlet. The third air inlet is detachably connected to the first air outlet, and the third air outlet is detachably connected to the exhaust port. The gas inside the sealing cover 1 can be output to the outside of the sealing cover 1 through the exhaust control unit 5. The bottom of the exhaust control unit 5 is equipped with casters.

[0045] The applicant discovered that the existing nitrogen-filling insect control system's nitrogen generation module 2 can only control nitrogen filling for a single tobacco stack. During the nitrogen filling process, the tobacco stack needs to undergo a repetitive cycle of evacuation, nitrogen filling, and balancing. Evacuation and nitrogen filling of a single tobacco stack takes 1 hour, and balancing takes 2 hours. When the oxygen concentration inside the tobacco stack reaches ≤0.5%, it must be left to stand for at least 25 days. During the nitrogen filling cycle balancing and tobacco stack standing period, other tobacco stacks cannot be nitrogen-filled; the next tobacco stack can only be nitrogen-filled after the previous one has been completed. Therefore, the existing nitrogen generation equipment can only fill a single location of the tobacco stack, resulting in low nitrogen filling efficiency.

[0046] Using the technical solution of this application, when nitrogen filling of the smokestack is required, the operator first pushes the air intake control unit 4 and the air extraction control unit 5 to the smokestack that needs nitrogen filling. The air intake control unit 4 is located between the nitrogen generation module 2 and the smokestack, and the air extraction control unit 5 is located between the smokestack and the air extraction module 3. The second air intake and the second air outlet on the air intake control unit 4 are connected to the nitrogen outlet of the nitrogen generation module 2 and the first air intake of the smokestack, respectively. The third air intake and the third air outlet on the air extraction control unit 5 are connected to the first air outlet of the smokestack and the air extraction port of the air extraction module 3, respectively. Then, the operator first starts the air extraction module 3 to evacuate the sealed cover 1 to remove oxygen from the smokestack. Then, the nitrogen generation module 2 is started to fill the smokestack with nitrogen. After the nitrogen filling is completed, the operator removes the air intake control unit 4 and the air extraction control unit 5 from both sides of the sealed cover 1, and then performs air extraction and nitrogen filling on the next smokestack.

[0047] This application utilizes movable air intake control units 4 and air extraction control units 5 on both sides of the smoke stack. By detachably connecting the air extraction control unit 5 to the air extraction module 3 and the smoke stack, a vacuum can be created in the smoke stack. Similarly, by detachably connecting the air intake control unit 4 to the nitrogen generation module 2 and the smoke stack, nitrogen can be introduced into the smoke stack. This separation of the air intake control unit 4 at the nitrogen generation module 2 end and the air extraction control unit 5 at the air extraction module 3 end to form a control unit reduces the weight and size of the unit and facilitates its movement. When nitrogen filling is required, the control unit can be moved to the desired location to perform the nitrogen filling operation. This allows the control unit to be moved to various warehouses, any floor, storage area, and stack location for nitrogen filling and pest control. Furthermore, during the resting period of the smoke stack, nitrogen filling can be performed on other smoke stacks, improving work efficiency.

[0048] For example, the nitrogen generation module 2 may include a membrane nitrogen generator or a pressure swing adsorption nitrogen generator. Optionally, in one embodiment of this invention, a 40m... 3This is a membrane separation nitrogen generator. Using air as feedstock, it separates oxygen and nitrogen under certain pressure conditions by utilizing the different permeation rates of gases with different properties, such as oxygen and nitrogen, within a membrane. In other words, the membrane separation nitrogen generator employs gas separation membrane technology, a chemical unit operation that separates substances by utilizing the different permeation rates of different gases through a specific membrane within the membrane separator. The mass transfer driving force is the partial pressure difference across the membrane. Driven by the pressure difference between the components of the mixed gas on both sides of the membrane, different gas molecules permeate through the membrane at different rates; gases with faster permeation rates accumulate on the permeate side, while gases with slower permeation rates accumulate on the feed side. Compared to other nitrogen generators, this membrane separation nitrogen generator has advantages such as simpler structure, smaller size, no switching valves, less maintenance, faster gas production (≤5 minutes), convenient capacity expansion, easy relocation, and low energy consumption. It is particularly suitable for medium and small-sized nitrogen users with nitrogen purity ≤98%, offering the best performance-price ratio.

[0049] For example, the air extraction module 3 is a vacuum pump.

[0050] During operation, the vacuum pump, controlled by the extraction control unit 5, first extracts the air from the sealed chimney. Then, the nitrogen generator module 2, controlled by the intake control unit 4, starts to output nitrogen gas, which is then sent into the sealed cover 1 of the chimney stack. When the nitrogen concentration in the sealed cover 1 increases to a certain level, such as above 98%, the chimney insects will suffocate and die. Additionally, when the oxygen content in the sealed cover 1 drops to the maintenance threshold, the vacuum pump can be used to extract and ventilate the stray gases from the sealed cover 1. Then, fresh, oxygen-rich outdoor air is blown into the chimney stack to achieve ventilation and remove stray gases until the oxygen concentration inside the chimney stack meets the maintenance requirements.

[0051] The sealing cover 1 is made of a composite membrane to form a sealed tent. Sealing strips are used to press the bottom edges of the tent firmly, sealing the entire chimney that needs insect control. A first air inlet and a first air outlet are respectively located on opposite sides of the sealing cover 1. Both the first air inlet and the first air outlet are connected to quick-connect fittings. Each quick-connect fitting includes a tube for gas passage and a sealing cap on one end. During installation, the quick-connect fitting is inserted into the first air inlet or the first air outlet. The first end of the quick-connect fitting is inside the sealing cover 1, i.e., on the side with the chimney, while the second end has a sealing cap. Both the sealing cap and the second end of the quick-connect fitting are located outside the sealing cover 1. During nitrogen filling, one end of the connecting hose is inserted into the second end of the quick-connect fitting. After nitrogen filling is complete, the connecting hose is removed from the quick-connect fitting, and the sealing cap is replaced to maintain the seal inside the sealing cover 1. It should be noted that the type of quick connector can be selected according to the user's needs. The quick connector can be fastened to the first air inlet or the first air outlet with fasteners, for example, the quick connector can be fixed to the first air inlet or the first air outlet with tape.

[0052] For example, the nitrogen outlet and the first air inlet, the first air inlet and the second air outlet, and the first air outlet and the third air inlet are connected by a connecting hose to allow gas communication.

[0053] Furthermore, the intake control unit 4 includes:

[0054] Ventilation pipe 44, with a second air inlet and a second air outlet at its two ends;

[0055] The first valve 43 is located on the vent pipe 44 and is used to control the opening and closing of the vent pipe 44.

[0056] The first detection module 42 is used to detect the temperature, humidity, pressure and oxygen concentration inside the sealing cover 1;

[0057] The first control unit 41 is electrically connected to the first detection module 42 and the first valve 43. The first control unit 41 is used to receive the temperature, humidity, pressure and oxygen concentration detected by the first detection module 42, and send a first switch signal to the first valve 43.

[0058] Specifically, one end of the connecting hose is connected to the nitrogen outlet via a quick connector, and the other end is connected to the second air inlet. Thus, after nitrogen is output from the nitrogen outlet, it enters one end of the ventilation line 44 through the connecting hose and is output from the other end of the ventilation line 44.

[0059] In the intake control unit 4, the first detection module 42 detects the temperature, humidity, pressure, and oxygen concentration of the gas inside the sealed enclosure 1 and transmits the detected data to the first control unit 41. The first control unit 41 sends a first switching signal to the first valve 43 based on the received detection data to control the opening and closing of the first valve 43, thereby controlling the on / off state of the ventilation pipeline 44. When the pressure value detected by the first detection module 42 reaches a first preset pressure value, for example, a vacuum value of -50 Pa, the first control unit 41 sends a first switching signal to the first valve 43 to open the first valve 43, thus supplying nitrogen into the sealed enclosure 1. When the oxygen concentration detected by the first detection module 42 reaches a preset concentration, the first control unit 41 sends a first switching signal to the first valve 43 to close the first valve 43, thus stopping the supply of nitrogen into the sealed enclosure 1. Optionally, the preset concentration is 1%. This solution can also monitor the temperature and humidity inside the sealed enclosure 1 in real time. When the temperature inside the sealed enclosure 1 exceeds a temperature threshold and / or the humidity exceeds a humidity threshold, the nitrogen generation module 2 can be used to refill the sealed enclosure 1 with appropriate nitrogen. This technical solution enables the regulation and stabilization of the temperature, humidity, pressure, and oxygen concentration of the gas inside the sealed cover 1, further ensuring the quality of the tobacco leaves stored in the tobacco stack.

[0060] For example, the first detection module 42 includes a temperature and humidity detection sensor 421, an oxygen concentration sensor 422, and a first pressure sensor 423, to monitor temperature, humidity, pressure, and oxygen concentration.

[0061] Furthermore, the sealing cover 1 is also provided with a first detection port and a second detection port. The first detection port is provided with a first detection tube 11, which is used to connect to a first pressure sensor 423. The first pressure sensor 423 can detect the air pressure inside the first detection tube 11. The second detection port is provided with a second detection tube 12.

[0062] The air intake control unit 4 also includes an air storage box 45 and an air pump 46. Temperature and humidity sensors 421 and oxygen concentration sensors 422 are both located inside the air storage box 45, and the second detection tube 12 is connected to the air storage box 45. The air pump 46 has an intake end, which is connected to the air storage box 45.

[0063] By adopting the above technical solution, the first detection module 42 is set in the air intake control unit 4. When in use, it is only necessary to connect the first detection tube 11 and the second detection tube 12 to the first pressure sensor 423 and the air storage box 45 respectively to realize the detection of temperature, humidity, oxygen concentration and pressure in the sealing cover 1. It is not necessary to set up a detection device in each smoke stack, thus greatly saving costs and reducing wiring.

[0064] Specifically, in this embodiment, the first detection tube 11 and the second detection tube 12 are small flexible tubes respectively disposed on the first and second detection ports. The first and second detection ports are opened on the sealing cover 1. Then, one end of the first detection tube 11 is inserted into the first detection port and sealed with adhesive tape to block the gap between the first detection tube 11 and the first detection port. The second detection tube 12 is installed onto the second detection port in the same manner. When the tobacco stack is stationary, the first and second detection tubes 11 and 12 are bent, and then clamped onto them to seal the pipe openings. This operation is simple and cost-effective.

[0065] The other end of the first detection tube 11 is connected to the first pressure sensor 423 in the intake control unit 4. Since the first detection tube 11 is in fluid communication with the inside of the sealing cover 1, the first pressure sensor 423 measures the pressure of the gas inside the first detection tube 11, thereby obtaining the pressure inside the sealing cover 1.

[0066] The gas storage box 45 is a sealed box. The other end of the second detection tube 12 is inserted into the sealed box. A sealing ring is provided between the second detection tube 12 and the sealed box, thereby enabling fluid communication between them. The suction end of the air pump 46 is connected to the gas storage box 45. The air pump 46 draws air from the gas storage box 45, thereby extracting the gas from the sealed cover 1 into the gas storage box 45. The temperature and humidity detection sensor 421 and the oxygen concentration sensor 422 installed in the gas storage box 45 measure the temperature, humidity, and oxygen concentration of the gas.

[0067] Furthermore, a central control unit is also provided, which is connected to the first control unit 41 via a wireless network. The central control unit is used to receive the first switch signal.

[0068] The central control unit is connected to the nitrogen generator module 2 and the first control unit 41. When the first control unit 41 sends a first switch signal to open the first valve 43, it also transmits the signal to the central control unit via a wireless network. Upon receiving the first switch signal to open the first valve 43, the central control unit starts the nitrogen generator module 2 to produce nitrogen.

[0069] In other embodiments of this implementation, multiple sets of air intake control units 4 and air extraction control units 5 are provided and arranged in a one-to-one correspondence to enable simultaneous nitrogen filling operations for multiple smoke stacks. The second air inlets of the multiple sets of air intake control units 4 are all connected to the nitrogen generation module 2, and the third air outlets of the air extraction control units 5 are all connected to the air extraction module 3. If the first valve 43 of any one set of control units is open, the central control unit will receive a first switch signal indicating that the valve is open, and the nitrogen generation module 2 will remain running; otherwise, when all the first control units 41 of the air intake control units 4 send a first switch signal to the central control unit indicating that the first valve 43 is closed, the central control unit will control the nitrogen generation module 2 to shut down.

[0070] Furthermore, the extraction control unit 5 includes:

[0071] The suction pipe 54 has a third air inlet and a third air outlet at its two ends, respectively.

[0072] The second valve 53 is located on the air extraction pipe 54 and is used to control the opening and closing of the air extraction pipe 54.

[0073] The second detection module is used to detect the pressure inside the sealing cover 1;

[0074] The second control unit 51 is electrically connected to the second detection module and the second valve 53. The second control unit 51 is used to receive the pressure detected by the second detection module and send a second switching signal to the second valve 53.

[0075] This technical solution is adopted to regulate and stabilize the pressure of the gas inside the sealing cover 1, thereby further ensuring the quality of the tobacco leaves stored in the tobacco stack.

[0076] Specifically, one end of the connecting hose is connected to the first air outlet via a quick connector, and the other end is connected to the third air inlet. The suction pipe 54 is connected to the third air inlet and the third air outlet of the suction control unit 5, thereby outputting the air inside the sealing cover 1 from the connecting hose to the vacuum pump, and then outputting the air to the outside through the vacuum pump.

[0077] In the vacuum control unit 5, the second detection module detects the pressure inside the sealing cover 1 and transmits the detected data to the second control unit 51. The second control unit 51 sends a second switching signal to the second valve 53 based on the received detection data to control the opening and closing of the second valve 53, thereby controlling the on / off state of the vacuum pipe 54. Initially, the vacuum module 3 evacuates the smoke stack, and the second control unit 51 controls the second valve 53 to open. When the pressure value detected by the second detection module decreases to a first preset pressure value, the second control unit 51 sends a second switching signal to the second valve 53 to close the second valve 53, stopping the vacuuming of the sealing cover 1. Then, the nitrogen generation module 2 outputs nitrogen gas to fill the sealed smoke stack.

[0078] For example, the second detection module includes a second pressure sensor 52.

[0079] Furthermore, the sealing cover 1 is also provided with a third detection port, and the third detection port is provided with a third detection tube 13. The third detection tube 13 is connected to the second pressure sensor 52, and the second pressure sensor 52 can detect the air pressure in the third detection tube 13.

[0080] By adopting the above technical solution, the second pressure sensor 52 is set inside the air extraction control unit 5. When in use, it is only necessary to connect the third detection tube 13 to the second pressure sensor 52 to realize the detection of the pressure inside the sealing cover 1, without the need to set up a detection device in each smoke stack. Therefore, it greatly saves costs and reduces wiring.

[0081] Specifically, the connection method between the third detection tube 13 and the third detection port is the same as the connection method between the first detection tube 11 and the first detection port, and will not be repeated here.

[0082] Furthermore, both the intake control unit 4 and the exhaust control unit 5 include cabinets. The ventilation pipe 44 passes through the cabinet of the intake control unit 4, and the first pressure sensor 423 and the air storage box 45 are both located within the cabinet of the intake control unit 4. The exhaust pipe 54 passes through the cabinet of the exhaust control unit 5, and the second pressure sensor 52 is located within the cabinet of the exhaust control unit 5. Casters are provided at the bottom of the cabinets of the intake control unit 4 and the exhaust control unit 5 to facilitate their movement.

[0083] For example, casters are located at the four corners of the cabinet, and the casters are omnidirectional wheels.

[0084] The nitrogen-filling system for smokestacks provided by this utility model connects the nitrogen generation module 2 to the air intake control unit 4, the air intake control unit 4 to the smokestack, and the smokestack to the extraction module 3 via connecting hoses, thereby forming a gas path for nitrogen flow and vacuuming. The first detection tube 11 is connected to the first pressure sensor 423 of the air intake control unit 4, the second detection tube 12 is connected to the gas storage box 45, and the third detection tube 13 is connected to the second pressure sensor 52. When the vacuum pump is started, the second control unit 51 of the extraction control unit 5 controls the second valve 53 to open, extracting air from the sealing cover 1. During the extraction process, the first pressure sensor 423 and the second pressure sensor 52 monitor the gas pressure inside the sealing cover 1. When the gas pressure inside the sealing cover 1 drops to a first preset value, the extraction of the sealing cover 1 is paused, and the second control unit 51 controls the second valve 53 to close. At this time, the first control unit 41 controls the first valve 43 to open, so that the nitrogen generated by the nitrogen generation module 2 is filled into the sealing cover 1. During nitrogen filling, the air pump 46 extracts air from the gas storage box 45, allowing air from the sealed cover 1 to flow into the gas storage box 45. Temperature and humidity sensors 421 and oxygen concentration sensors 422 monitor the gas temperature, humidity, and oxygen concentration, transmitting the monitored data to the first control unit 41, thus enabling monitoring of the temperature, humidity, and oxygen concentration of the gas inside the smoke stack. When the oxygen concentration inside the sealed cover 1 drops to a preset concentration, the first control unit 41 controls the first valve 43 to close. After the smoke stack is left to stand for a period of time, the above-mentioned air extraction and nitrogen filling process is repeated to ensure that the nitrogen in the smoke stack meets the requirements for insect control. During the standing period, the air intake control unit 4 and the air extraction control unit 5 can be moved to other smoke stacks for nitrogen filling. Therefore, this invention not only allows for nitrogen filling of smoke stacks in different locations using a single control unit but also improves nitrogen filling efficiency.

[0085] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A nitrogen-filling system for smokestacks, characterized in that, include: A sealing cover is provided on the outside of the smoke stack, and the sealing cover is provided with a first air inlet and a first air outlet; A nitrogen generation module is used to generate nitrogen gas and is provided with a nitrogen gas outlet, from which the generated nitrogen gas is output; An extraction module is used to extract gas from the sealed cover, and the extraction module is provided with an extraction port. An air intake control unit is movably disposed between the nitrogen generation module and the smoke stack. The air intake control unit includes a second air inlet and a second air outlet. The second air inlet is detachably connected to the nitrogen outlet, and the second air outlet is detachably connected to the first air inlet. The nitrogen output from the nitrogen outlet can enter the sealed cover through the air intake control unit. The bottom of the air intake control unit is provided with casters. An exhaust control unit is movably disposed between the smoke stack and the exhaust module. The exhaust control unit includes a third air inlet and a third air outlet. The third air inlet is detachably connected to the first air outlet, and the third air outlet is detachably connected to the exhaust port. The gas inside the sealing cover can be output to the outside of the sealing cover through the exhaust control unit. The bottom of the exhaust control unit is provided with casters.

2. The system according to claim 1, characterized in that, The intake control unit includes: A ventilation pipe, wherein the two ends of the ventilation pipe are the second air inlet and the second air outlet, respectively; A first valve is provided on the venting pipeline and is used to control the opening and closing of the venting pipeline; The first detection module is used to detect the temperature, humidity, pressure and oxygen concentration inside the sealed cover; The first control unit is electrically connected to the first detection module and the first valve. The first control unit is used to receive the temperature, humidity, pressure and oxygen concentration detected by the first detection module, and send a first switching signal to the first valve.

3. The system according to claim 2, characterized in that, The first detection module includes a temperature and humidity sensor, an oxygen concentration sensor, and a first pressure sensor.

4. The system according to claim 3, characterized in that, The sealing cover is also provided with a first detection port and a second detection port. The first detection port is provided with a first detection tube, which is used to connect to a first pressure sensor. The first pressure sensor can detect the air pressure in the first detection tube. The second detection port is equipped with a second detection tube. The intake control unit also includes: The gas storage box contains both the temperature and humidity sensor and the oxygen concentration sensor, and the second detection tube is connected to the gas storage box. An air pump has an air intake end, which is connected to the air storage box.

5. The system according to claim 2, characterized in that, It also includes a central control unit, which is connected to the first control unit via a wireless network, and the central control unit is used to receive the first switch signal.

6. The system according to claim 1, characterized in that, The air extraction control unit includes: An air extraction pipe, wherein the two ends of the air extraction pipe are the third air inlet and the third air outlet, respectively; The second valve is located on the extraction pipe and is used to control the opening and closing of the extraction pipe; The second detection module is used to detect the pressure inside the sealing cover; The second control unit is electrically connected to the second detection module and the second valve. The second control unit is used to receive the pressure detected by the second detection module and send a second switching signal to the second valve.

7. The system according to claim 6, characterized in that, The second detection module includes a second pressure sensor.

8. The system according to claim 7, characterized in that, The sealing cover is also provided with a third detection port, and the third detection port is provided with a third detection tube. The third detection tube is connected to the second pressure sensor, and the second pressure sensor can detect the air pressure in the third detection tube.

9. The system according to claim 1, characterized in that, Both the air intake control unit and the air extraction control unit include a cabinet, and the cabinet is equipped with casters at the bottom.

10. The system according to claim 9, characterized in that, The casters are located at the four corners of the cabinet and are omnidirectional casters.

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