Adjustable gas diverter and nitrogen replacement system using same

Abstract

The utility model relates to an adjustable gas flow divider and a nitrogen replacement system using the flow divider, and relates to the field of fire-fighting technologies. The device comprises a base installed in a target device, the base is provided with a top flow dividing section, the top flow dividing section is used for dividing inert gas sprayed out of a spray head, and the base is provided with a first flow guiding section and a second flow guiding section on the two sides of the top flow dividing section correspondingly and is in smooth transition with the top flow dividing section; and the first drainage section and the second drainage section are used for guiding the split inert gas. Effective diffusion of nitrogen in the box body in a short time can be achieved, the replacement efficiency of inert gas is improved, airflow dead angles are reduced, and the problem that the local concentration near a leakage source is too high is solved. Through rapid diffusion of the inert gas, the oxygen concentration in the container is rapidly reduced to the critical oxygen concentration, and the phenomenon that the local combustible gas concentration and the combustion-supporting gas concentration in the leakage source part area in the target device are too high is relieved, so that the risk of local deflagration is reduced.

Description

Technical Field

[0001] This application relates to the field of fire protection technology, and in particular to an adjustable gas distributor and a nitrogen replacement system using the distributor. Background Technology

[0002] In enclosed devices such as power distribution cabinets, energy storage containers, and various industrial equipment, a large amount of dust or flammable gas is often generated during operation or internal reactions. These devices are at risk of explosion, so they must be monitored at all times and effective measures must be taken to prevent explosion accidents.

[0003] Taking energy storage containers as an example, as high-efficiency energy storage devices in power systems, their core is the battery system, typically using lithium battery packs. These battery packs consist of multiple individual cells connected in series and parallel to meet different voltage and capacity requirements. During charging and discharging, the batteries generate heat. If this heat cannot be dissipated in time, the battery temperature will continue to rise, eventually leading to thermal runaway. Once thermal runaway occurs, the positive and negative electrode materials inside the battery undergo violent chemical reactions, releasing a large amount of heat and gas, causing a sharp increase in internal pressure and ultimately leading to battery pack rupture. A ruptured battery pack releases flammable gases such as hydrogen, carbon monoxide, and electrolyte leakage gases. The accumulation of these flammable gases could potentially cause an explosion inside the energy storage container.

[0004] To reduce the concentration of combustible gases inside energy storage containers and ensure the safety of the internal environment, the common method is to perform gas replacement operations inside the container to reduce the concentration of combustible and combustion-supporting gases, thereby reducing the possibility of explosion.

[0005] Energy storage containers are generally rectangular box structures, with multiple battery packs installed sequentially at intervals along their length. Each battery pack consists of vertically arranged battery cells, and each battery pack is mounted inside the container with gaps between it and the container's inner walls at the front and back to allow for airflow, enabling air exchange and heat dissipation. Multiple airflow purging channels are formed between the battery packs and the different inner walls of the container, and these channels connect to the outside environment.

[0006] Currently, inert gases such as nitrogen are commonly used to replace flammable and combustion-supporting gases inside energy storage containers. These gases are released through nozzles installed in pipes inside the container. The inert gas injection pipes are typically located in the middle of the container. Due to limitations in the number and location of the nozzles, it is difficult to lay them in all airflow purging channels, making it difficult for nitrogen to effectively diffuse throughout the entire container in a short time. This makes it difficult for the oxygen concentration in certain areas of the energy storage container to quickly drop to or below the critical oxygen concentration before the hydrogen concentration reaches the lower explosive limit, thus posing a risk of localized deflagration. Utility Model Content

[0007] In order to achieve effective diffusion of nitrogen within the container in a short time, rapidly reduce the oxygen concentration inside the container to the critical oxygen concentration, and alleviate the phenomenon of excessively high local flammable gas and combustion-supporting gas concentrations in some areas of the leak source within the target device, thereby reducing the risk of local deflagration, this application provides an adjustable gas distributor and a nitrogen replacement system using the distributor.

[0008] This application provides an adjustable gas splitter using the following technical solution:

[0009] An adjustable gas splitter includes a base installed in a target device, a top splitting section provided on the base for splitting inert gas ejected from a nozzle, a first guide section and a second guide section respectively provided on both sides of the top splitting section and smoothly transitioning to the top splitting section, the first guide section and the second guide section being used to guide the split inert gas.

[0010] By adopting the above technical solution, the streams of inert gas are diverted when they impact the top diversion section. The diverted inert gas is guided through the first and second diversion sections and enters different airflow purging channels. The surfaces of the first and second diversion sections used for guiding the flow are straight, thereby dispersing and guiding the streams of gas and exporting them in the form of a surface-shaped air wall. This allows the inert gas to diffuse quickly and fully in the corresponding airflow purging channels, forming an organized directional airflow. The original gas in the airflow purging channels is pushed to the outside, thereby rapidly reducing the oxygen concentration and alleviating the phenomenon of excessively high local flammable gas and combustion-supporting gas concentrations in the leakage source area of ​​the target device, thus reducing the risk of local deflagration.

[0011] Optionally, the angle between the first diversion section and the horizontal plane is denoted as θ1, and the angle between the second diversion section and the horizontal plane is denoted as θ2. The difference between the angles θ1 and θ2 can be used to adjust the gas flow ratio on both sides of the top diversion section, where 7°≤θ1≤20° and 2°≤θ2≤5°.

[0012] By adopting the above technical solution, the angle between the first diversion section and the horizontal plane is denoted as θ1, where 7°≤θ1≤20°, and the angle between the second diversion section and the horizontal plane is denoted as θ2, where 2°≤θ2≤5°. This ensures that the flow rate ratio of the nitrogen gas flow corresponding to the first diversion section and the second diversion section is greater than 1. By using the different tilt angles of the first and second diversion sections, a fixed flow division of the gas flow is achieved, which can accommodate the net volume differences between different gas flow purging channels, so that the oxygen concentration in the gas flow purging channels with different net volumes decreases synchronously.

[0013] Optionally, the first and second diversion sections are provided with fixed diversion grids for guiding the flow.

[0014] By adopting the above technical solution, the fixed guide grid is used to guide the inert airflow below the first and second guide sections, thereby reducing inert airflow turbulence.

[0015] Optionally, the fixed flow guide grid is detachably mounted on the first flow guide section and the second flow guide section. The first flow guide section and the second flow guide section are provided with positioning grooves corresponding to the positions of the fixed flow guide grid. The fixed flow guide grid is installed in the positioning grooves through a first threaded component.

[0016] By adopting the above technical solution, the positioning groove is used to position the fixed flow guide grid. The fixed flow guide grid is fixedly connected to the positioning groove by the first threaded part, thereby improving the installation stability of the fixed flow guide grid on the base.

[0017] Optionally, an adjustable flow guide is movably provided on the first flow section and / or the second flow section for adjusting the gas flow rate.

[0018] By adopting the above technical solution and setting an adjustable flow guide, the operator can rotate the adjustable flow guide to change its angle, thereby adjusting the flow guiding effect of the adjustable flow guide on the inert airflow, and thus adjusting the gas flow ratio between the airflow corresponding to the first flow guide section and the airflow corresponding to the second flow guide section.

[0019] Optionally, the adjustable flow guide is rotatably connected to the second flow section, the second flow section is provided with a guide groove, and the adjustable flow guide is provided with a second threaded component, which passes through the guide groove and is threadedly connected to the adjustable flow guide.

[0020] By adopting the above technical solution, the second threaded part connected to the adjustable guide grid passes through the guide groove. The operator can loosen the second threaded part and adjust the angle of the adjustable guide grid. After the angle adjustment is completed, the second threaded part can be tightened to press against the base, so as to achieve the adjustable position fixation between the adjustable guide grid and the base.

[0021] Optionally, a scale line for controlling the adjustment angle is provided on the second diversion section at the position corresponding to the adjustable flow guide.

[0022] By adopting the above technical solution and setting scale lines, operators can easily refer to the deflection angle of the adjustable guide vane.

[0023] This application also provides a nitrogen replacement system using the following technical solution:

[0024] A nitrogen replacement system includes an injection pipe and a distributor disposed within a housing. The injection pipe is located at the bottom of the housing, and the distributor is located above the injection pipe. The injection pipe is configured with a top section facing the distributor. An exhaust port is disposed near the top of the housing. A first airflow channel and a second airflow channel for nitrogen circulation are disposed within the housing.

[0025] The airflow in the first airflow channel passes sequentially through the splitter, the front airflow purging channel, the top airflow channel, and the exhaust port;

[0026] The airflow in the second airflow channel passes sequentially through the splitter, the back airflow purging channel, and the exhaust port;

[0027] The flow divider is used to control the flow rate ratio of nitrogen entering the first airflow channel and the second airflow channel, and the injection pipe is connected to the exhaust port through the first airflow channel and the second airflow channel.

[0028] By adopting the above technical solution, the injection pipe is placed at the bottom of the container, forming an organized, upward-flowing directional airflow. This provides an additional traction velocity for the combustible and combustion-supporting gases inside the container, helping them to rise and be discharged. Under the action of the diverter, the nitrogen entering the energy storage container is reorganized and effectively diffused in a short time, avoiding disorderly flow. It can also continuously purge the leak source, reduce the local concentration, and continuously purge the first and second airflow channels. Furthermore, it forms two complete replacement channels on the front and back sides of the energy storage container, which helps to improve the nitrogen replacement efficiency.

[0029] Because the net capacity of the front airflow purging channel may differ from that of the rear airflow purging channel, the total oxygen content in the two channels will vary. Therefore, it is necessary to differentiate the total nitrogen volume entering the first and second airflow channels to match their respective application scenarios. The general principle of allocation is to allocate more nitrogen to areas closer to the leakage source and areas with higher oxygen content, and vice versa. This differentiated nitrogen allocation is achieved by a distributor positioned above the nitrogen injection pipe. It has a significant fixed-rate flow division function, adjusting the flow ratio according to the net volume of the first and second airflow channels. This further improves the applicability of the nitrogen replacement system to match diverse application scenarios.

[0030] Optionally, a diffusion section is provided at the injection port of the injection pipe, and the diffusion angle of the diffusion section is γ, 10°≤γ≤15°.

[0031] By adopting the above technical solution, the diffusion section on the injection nozzle of the injection pipe is used to slow down the nitrogen flow rate at the opening of the injection pipe.

[0032] Optionally, the distance between the injection pipe and the splitter is h, and the opening diameter of the diffusion section of the injection pipe is d, where 2d≤h≤4d.

[0033] By adopting the above technical solution, the distance h between the injection pipe and the distributor is controlled such that 2d ≤ h ≤ 4d, where 2d ≤ h, to reduce impact loss and flow resistance, and to mitigate the rebound of nitrogen gas impacting the distributor, which would affect the nitrogen gas flow discharge effect of the injection pipe. Furthermore, controlling h ≤ 4d prevents excessive diffusion of the nitrogen gas flow before it reaches the space distributor, thus avoiding any impact on the distributor's nitrogen gas flow distribution effect.

[0034] In summary, this application includes at least one of the following beneficial technical effects:

[0035] 1. When the stream of airflow impacts the top splitting section, it is split. The split nitrogen is then introduced into different channels through the first and second diversion sections. The first and second diversion sections are straight surfaces used for guiding the flow, thereby dispersing and guiding the stream of airflow and exporting it in the form of a surface-shaped air wall. This allows the nitrogen to diffuse quickly and fully into the corresponding airflow purging channels.

[0036] 2. Under the action of the diverter, the nitrogen entering the energy storage container is reorganized and effectively diffused in a short time to avoid disorderly flow. It can also continuously purge the leakage source, reduce the local concentration, and continuously purge the first and second airflow channels. It also forms two complete replacement channels on the front and back sides of the energy storage container, which helps to improve the nitrogen replacement efficiency.

[0037] 3. Since the net capacity of the front airflow purging channel is different from that of the back airflow purging channel, a flow divider is installed above the nitrogen injection pipe. The nitrogen is divided by the first flow section, the second flow section, the fixed flow guide grid, and the adjustable flow guide grid on the flow divider. This allows control over the flow ratio of nitrogen entering the first airflow channel and the second airflow channel, achieving a fixed flow division of the injected nitrogen to match different application scenarios and further improve the applicability of the nitrogen replacement system.

[0038] 4. The fixed flow deflector is used to guide the nitrogen flow below the first or second flow deflector section and reduce airflow turbulence;

[0039] 5. An adjustable flow guide is provided. The operator can rotate the adjustable flow guide to change its angle, thereby adjusting the flow of nitrogen gas and thus adjusting the flow ratio of nitrogen gas in the first and second flow guide sections. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application.

[0041] Figure 2 This is a schematic diagram of the base structure used in Embodiment 1 of this application.

[0042] Figure 3 This is a schematic diagram of the structure of the adjustable flow guide and the fixed flow guide in Embodiment 1 of this application.

[0043] Figure 4 This is an exploded view of Embodiment 1 of this application, illustrating the guide channel.

[0044] Figure 5 yes Figure 4 An enlarged schematic diagram of part A in the middle.

[0045] Figure 6 This is a schematic diagram of the overall structure of Embodiment 2 of this application.

[0046] Figure 7 This is a cross-sectional view of Embodiment 2 of this application, illustrating the splitter and the injection tube.

[0047] Figure 8 This is a cross-sectional view of Embodiment 2 of this application, used to illustrate the positional relationship between the splitter and the injection tube.

[0048] Figure 9 This is a cross-sectional view of Embodiment 2 of this application used to illustrate the injection tube.

[0049] Explanation of reference numerals in the attached drawings: 1. Housing; 11. Battery pack; 12. Exhaust port; 13. Injection pipe; 14. Diffusion section; 22. Front airflow purging channel; 23. Rear airflow purging channel; 24. Top airflow channel; 3. Diverter; 31. Base; 32. Top diversion section; 33. First diversion section; 34. Second diversion section; 35. Side guard; 4. Fixed guide grille; 41. First threaded component; 42. Positioning groove; 5. Adjustable guide grille; 51. Second threaded component; 52. Guide groove; 53. Scale line. Detailed Implementation

[0050] The following is in conjunction with the appendix Figure 1-9 This application will be described in further detail. Example 1

[0051] This application discloses an adjustable gas splitter. For example... Figure 1 and Figure 2 The adjustable gas splitter includes a base 31, which is used to fix the target device. The base 31 is positioned directly opposite the inert gas injection port in the target device. In this embodiment, the base 31 is horizontally positioned when installed in the target device, and the inert gas injection port is located below the base 31.

[0052] The vertical projection of the base 31 is rectangular. The width of the base 31 is in the X direction, and baffles 35 are provided on both sides of the base 31 along the X direction. The baffles 35 are positioned towards the inert gas injection port to guide the inert gas flow and reduce the problem of inert gas flow dispersion. The length direction of the base 31 is in the Y direction. A top flow-dividing section 32 is provided at a certain position of the base 31 along the Y direction. On both sides of the top flow-dividing section 32 along the Y direction, there are an upwardly inclined first guide section 33 and a second guide section 34, respectively. The angle between the first guide section 33 and the horizontal plane is denoted as θ1, and the angle between the second guide section 34 and the horizontal plane is denoted as θ2. The difference between the angles θ1 and θ2 can be used to adjust the gas flow ratio on both sides of the top flow-dividing section, where 7°≤θ1≤20° and 2°≤θ2≤5°.

[0053] The target device is equipped with airflow purging channels corresponding to the first diversion section 33 and the second diversion section 34. The airflow purging channels are connected to the outside of the target device. Inert airflow is guided into the corresponding airflow purging channels through the first diversion section 33 and the second diversion section 34 to reduce the concentration of combustible gas and combustion-supporting gas in the airflow purging channels.

[0054] Since there is a difference in net volume between the airflow purging channel corresponding to the first diversion section 33 and the airflow purging channel corresponding to the second diversion section 34, the inclination angles of the first diversion section 33 and the second diversion section 34, namely the angles θ1 and θ2, are designed to adjust the flow rate ratio of the inert airflow below the first diversion section 33 and the inert airflow below the second diversion section 34. This makes the concentration of combustible gas and the concentration of combustion-supporting gas in the airflow purging channels with different net volumes tend to decrease synchronously, reducing the risk of local deflagration. In this embodiment, θ1 is 15° and θ2 is 3°.

[0055] The top diversion section 32 is located directly above the inert gas injection port, and the side of the top diversion section 32 facing the inert gas injection port is curved. The sides of the first guide section 33 and the second guide section 34 facing the inert gas injection port are straight, and the straight sides of the first guide section 33 and the second guide section 34 smoothly transition to the curved surface of the top diversion section 32. Setting the sides of the first guide section 33 and the second guide section 34 to be straight is to disperse the stream of inert gas and guide it out in the form of a surface-shaped gas wall, thereby allowing the inert gas to fully diffuse in the corresponding airflow purging channel. The input of inert gas forms an organized directional airflow, pushing the original gas in the airflow purging channel to the outside, thereby rapidly reducing the concentration of combustible gas and combustion-supporting gas. This helps alleviate the excessively high concentrations of carbon monoxide, hydrogen, and oxygen in the leak source area of ​​the target device, further reducing the risk of local deflagration.

[0056] like Figure 3 and Figure 4A fixed flow guide 4 is fixedly connected to the side of the first and second flow guide sections 33 and 34 facing the inert gas injection port. The fixed flow guide 4 is a rectangular thin plate and is parallel to the flow direction of the inert gas below the first and second flow guide sections 33 and 34, i.e., the Y direction. Several positioning grooves 42 for embedding the fixed flow guide 4 are formed on the lower surface of the first and second flow guide sections 33 and 34 to facilitate the positioning of the fixed flow guide 4. The fixed flow guide 4 is detachably installed in the positioning grooves 42 via a first threaded component 41. In this embodiment, the first threaded component 41 is a locking bolt. The locking bolt passes through the corresponding first or second flow guide section 33 and is threaded onto the fixed flow guide 4, realizing the detachable connection of the fixed flow guide 4 on the first and second flow guide sections 33 and 34, facilitating replacement and fixation.

[0057] like Figure 4 and Figure 5 An adjustable guide grid 5 is rotatably connected to the side of the first guide section 33 and / or the second guide section 34 facing the inert gas injection port. In this embodiment, two adjustable guide grids 5 are provided on the second guide section 34, and the two adjustable guide grids 5 are spaced apart along the X direction of the base 31. The adjustable guide grid 5 is rectangular plate-shaped and is always perpendicular to the lower surface of the second guide section 34. The adjustable guide grid 5 is rotatably connected to the lower surface of the second guide section 34, and the rotation axis of the adjustable guide grid 5 is perpendicular to the lower surface of the second guide section 34.

[0058] The adjustable flow guide 5 is rotated and fixed to the second flow guide section 34 via the second threaded component 51. In this application, the second threaded component 51 is an adjusting bolt. Each adjustable flow guide 5 is provided with two adjusting bolts, both of which pass through the second flow guide section 34 and are threadedly connected to the adjustable flow guide 5. The two adjusting bolts are referred to as the first adjusting bolt and the second adjusting bolt, respectively. The first adjusting bolt serves as the rotation axis of the adjustable flow guide 5, allowing the adjustable flow guide 5 to be rotatably connected to the second flow guide section 34. The second flow guide section 34 is provided with an arc-shaped guide groove 52 corresponding to the position of the second adjusting bolt, and the central axis of the arc-shaped guide groove 52 is collinear with the rotation axis of the adjustable flow guide 5. During the rotation of the adjustable flow guide 5, the second adjusting bolt is driven to slide within the arc-shaped guide groove 52. The operator can tighten the second adjusting bolt to press against the second flow guide section 34 and restrict the rotation of the adjustable flow guide 5, thereby fixing the angle of the adjustable flow guide 5.

[0059] The outer side of the arc-shaped guide groove 52 is provided with scale lines 53, so that the rotation angle of the adjustable guide grid 5 can be controlled and understood more intuitively, thereby controlling the adjustment effect of the adjustable guide grid 5 on the inert airflow below the second guide section 34, and thus controlling the flow ratio of the inert airflow corresponding to the first guide section 33 and the inert airflow corresponding to the second guide section 34. Example 2

[0060] This application discloses a nitrogen replacement system using an adjustable gas splitter. For example... Figure 6 and Figure 7 The nitrogen replacement system includes an injection pipe 13 installed inside the housing 1. The injection pipe 13 is used to release nitrogen gas. The injection pipe 13 is vertically positioned near the inlet and below the battery pack 11. A distributor 3 is installed below the battery pack 11 and above the inlet of the injection pipe 13. The distributor 3 is used to split and guide the nitrogen gas.

[0061] like Figure 7 and Figure 8 Specifically, the baffles 35 on both sides of the base 31 are oriented towards the injection pipe 13, the first guide section 33 and the second guide section 34 are inclined away from the injection pipe 13, and the top diversion section 32 is located directly above the nitrogen injection port. The distance between the arc surface of the top diversion section 32 and the nitrogen injection port is h, and the maximum opening inner diameter of the diffuser section 14 of the injection pipe 13 is d, where 2d≤h≤4d. By controlling the distance between the arc surface of the top diversion section 32 and the injection port of the injection pipe 13, the flow velocity of the nitrogen gas stream injected by the injection pipe 13 onto the base 31 is controlled. It is necessary to avoid the injection pipe 13 being too close to the base 31, causing the nitrogen gas to bounce when it hits the base 31, affecting the normal nitrogen output of the injection pipe 13; it is also necessary to avoid the injection pipe 13 being too far from the base 31, causing the nitrogen gas stream to be too slow when it comes into contact with the base 31, thus affecting the diversion effect of the nitrogen gas stream.

[0062] like Figure 9 A diffusion section 14 is provided at the injection port position of the injection pipe 13. The diffusion section 14 is funnel-shaped, and the diffusion angle of the injection port of the injection pipe 13 at the diffusion section 14 is γ, 10°≤γ≤15°. In the embodiment of this application, γ is 12°, 13° or 14°. By increasing the diameter of the diffusion section 14, the nitrogen flow rate at the opening position of the injection pipe 13 can be reduced.

[0063] like Figure 6 and Figure 7 The gap between the front side of each battery pack 11 and the front wall of the housing 1 is designated as the front airflow purging channel 22; the gap between the rear side of each battery pack 11 and the rear wall of the housing 1 is designated as the rear airflow purging channel 23; and the gap between the top of each battery pack 11 and the top wall of the housing 1 is designated as the top airflow channel 24. An exhaust port 12 is located near the top of the housing 1, and the exhaust port 12 connects the inside and outside of the housing 1.

[0064] The injection pipe 13 is connected to the exhaust port 12 through the first airflow channel and the second airflow channel. The first airflow channel passes through the first guide section 33 on the distributor 3, the front airflow purging channel 22, the top airflow channel 24 and the exhaust port 12 in sequence. The second airflow channel passes through the second guide section 34 of the distributor 3, the back airflow purging channel 23 and the exhaust port 12 in sequence.

[0065] The net volumes of the first and second airflow channels are denoted as V1 and V2, respectively. The net volume ratio n is calculated as n = V1 / V2. The operator rotates the adjustable guide grid 5 to change the angle between the adjustable guide grid 5 and the center line of the width direction of the base 31, thereby adjusting the flow ratio of nitrogen below the first diversion section 33 and the second diversion section 34. This achieves a fixed diversion of nitrogen, keeping the nitrogen concentration in the first and second airflow channels balanced, and simultaneously reducing the concentration of combustible gas, i.e., oxygen concentration. This helps to alleviate the risk of local deflagration caused by excessive concentrations of combustible and combustible gases in local locations.

[0066] In other embodiments, a baffle (not shown in the figure) is movably disposed outside the exhaust port 12 to block the exhaust port 12. The baffle is hinged to the upper end of the exhaust port 12 and located on the outside of the housing 1. A magnet is fixedly connected to the baffle, and an iron sheet is disposed on the housing 1 at the position of the exhaust port 12. When the baffle is closed, the magnet and the iron sheet attract each other, thereby fixing the baffle and improving the sealing effect of the baffle on the exhaust port 12. Under normal conditions, the pressure difference between the inside and outside of the housing 1 is the same, and the baffle covers the exhaust port 12 under its own weight, thus providing a blocking effect. If the air pressure inside the housing 1 is greater than the air pressure outside the housing, the airflow will push open the baffle, allowing airflow.

[0067] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An adjustable gas flow splitter, characterized by: The base (31) is installed in the target device, a top part flow section (32) is arranged on the base (31), the top part flow section (32) is used for shunting the inert gas sprayed by the shower head, the base (31) is provided with a first flow guide section (33) and a second flow guide section (34) on both sides of the top part flow section (32) respectively, and the first flow guide section (33) and the second flow guide section (34) are smoothly connected with the top part flow section (32), and the first flow guide section (33) and the second flow guide section (34) are used for guiding the shunted inert gas.

2. An adjustable gas flow splitter according to claim 1, wherein: The angle between the first flow guide section (33) and the horizontal plane is θ1, the angle between the second flow guide section (34) and the horizontal plane is θ2, the flow rate ratio of the two sides of the top part flow section (32) can be adjusted by the angle difference between θ1 and θ2, 7°≤θ1≤20°, and 2°≤θ2≤5°.

3. An adjustable gas flow splitter according to claim 1, wherein: The first flow guide section (33) and the second flow guide section (34) are provided with fixed flow guide grids (4) for guiding flow.

4. An adjustable gas flow splitter according to claim 3, wherein: The fixed flow guide grids (4) are detachably arranged on the first flow guide section (33) and the second flow guide section (34), the first flow guide section (33) and the second flow guide section (34) are provided with positioning grooves (42) corresponding to the positions of the fixed flow guide grids (4), and the fixed flow guide grids (4) are installed in the positioning grooves (42) through first threaded members (41).

5. The adjustable gas flow splitter of claim 1, wherein: The first flow guide section (33) and / or the second flow guide section (34) are movably provided with adjustable flow guide grids (5) for adjusting the flow rate of the gas.

6. An adjustable gas flow splitter according to claim 5, wherein: The adjustable flow guide grids (5) are rotationally connected to the second flow guide section (34), the second flow guide section (34) is provided with a guide groove (52), the adjustable flow guide grids (5) are provided with second threaded members (51), the second threaded members (51) penetrate the guide groove (52) and are threadedly connected to the adjustable flow guide grids (5).

7. An adjustable gas flow splitter according to claim 5, wherein: The second flow guide section (34) is provided with scale lines (53) for controlling the adjustment angle corresponding to the position of the adjustable flow guide grids (5).

8. A nitrogen replacement system using the adjustable gas flow splitter of any one of claims 1-7. The injection pipe (13) and the flow divider (3) are arranged in the box body (1), the injection pipe (13) is located at the bottom of the box body (1), the flow divider (3) is located above the injection pipe (13), the injection pipe (13) is arranged towards the top part flow section (32) of the flow divider (3), the box body (1) is provided with an exhaust port (12) near the upper position, and the box body (1) is provided with a first gas flow channel and a second gas flow channel for nitrogen flow; The gas flow in the first gas flow channel passes through the flow divider (3), the front side gas flow purging channel (22), the top gas flow channel (24) and the exhaust port (12) in sequence; The gas flow in the second gas flow channel passes through the flow divider (3), the back side gas flow purging channel (23) and the exhaust port (12) in sequence; The flow divider (3) is used for controlling the flow rate ratio of nitrogen entering the first gas flow channel and the second gas flow channel, and the injection pipe (13) is communicated with the exhaust port (12) through the first gas flow channel and the second gas flow channel.

9. A nitrogen displacement system according to claim 8, wherein: The injection pipe (13) is provided with a diffusion section (14) at the position of the injection port, the diffusion angle of the diffusion section (14) is γ, and 10°≤γ≤15°.

10. The nitrogen displacement system of claim 8, wherein: The distance between the injection pipe (13) and the flow divider (3) is h, the opening diameter of the diffusion section (14) of the injection pipe (13) is d, and 2d≤h≤4d.

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