A gas flow control cabinet

Abstract

The application discloses a kind of gas flow control cabinet, it is related to gas technical field, including gas flow control cabinet body, the inside of gas flow control cabinet body is provided with the fixed support frame of collective bearing to gas storage box, the lower end of gas storage box is connected with gas mixing tank by the second one-way valve body and is penetrated in the middle part of fixed support frame, for mixing output to gas, the rear side of gas mixing tank is provided with the blowing tank that can be washed operation.Solve the gas flow control cabinet of conventional, when controlling discharge to gas, often only one-way or independent gas is carried out output, and in laboratory and other special places, due to the diversification of test gas, one-way single sample gas output can greatly reduce operating efficiency, at the same time, after gas is transported, it can make pipeline residual excess gas, if not cleaned, it can affect the output operation of other gas.

Description

Technical Field

[0001] This invention relates to the field of gas technology, and more specifically to a gas flow control cabinet. Background Technology

[0002] A gas flow control cabinet is an integrated device used to precisely control gas flow, pressure, and mixing ratio. It is widely used in industrial, medical, and environmental protection fields. In particular, in places such as medical laboratories, where a variety of gases are tested, a control cabinet is required.

[0003] Compared to existing control cabinets, conventional gas flow control cabinets often only output gas in one direction or independently when controlling the discharge of gas. However, in special places such as laboratories, due to the diversity of gases being tested, unidirectional single-sample gas output will greatly reduce operating efficiency. At the same time, after the gas is transported, excess gas will remain in the pipeline. If it is not cleaned, it will affect the output operation of other gases. Summary of the Invention

[0004] The purpose of this invention is to provide a gas flow control cabinet that solves the following technical problems: Conventional gas flow control cabinets often only output gas in one direction or independently when controlling the discharge of gas. However, in special places such as laboratories, due to the diversity of gases being tested, unidirectional single-sample gas output will greatly reduce operating efficiency. At the same time, after the gas is transported, excess gas will remain in the pipeline. If it is not cleaned, it will affect the output operation of other gases.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A gas flow control cabinet includes: a gas flow control cabinet body, a fixed support frame for collectively supporting a gas storage box is provided on the inner side of the gas flow control cabinet body, the lower end of the gas storage box is connected to a gas mixing box through the middle of the fixed support frame via a second one-way valve body for mixing and outputting gas, and a blowing box for cleaning operation is provided on the rear side of the gas mixing box.

[0007] As a further aspect of the present invention: the front left and right sides of the gas flow control cabinet body are rotatably connected to movable closing door panels, and the rear side of the movable closing door panels is bonded with a sealing element that engages with the gas flow control cabinet body.

[0008] As a further aspect of the present invention: a gas flow meter is provided at the front end of the gas storage box, and a first exhaust pipe located at the front end of the gas storage box is provided on the lower side of the gas flow meter. The front end of the first exhaust pipe is connected to a first booster pump through a first one-way valve body, and a first connecting flange is provided at the front end of the first booster pump.

[0009] The first connecting flange is arranged in four equal parts at the front end of the first booster pump.

[0010] As a further aspect of the present invention: the gas mixing box is threadedly connected to the gas flow control cabinet body by a second bolt, and a first air inlet pipe is equidistantly distributed at the upper end of the gas mixing box. The upper end of the first air inlet pipe is connected to a second connecting flange by a sealing ring, and a second booster pump is provided at the upper end of the second connecting flange.

[0011] The upper end of the second booster pump is provided with a third connecting flange that is connected to the second exhaust pipe.

[0012] As a further aspect of the present invention: the front end of the gas mixing box is provided with a fourth connecting flange connected to the second air inlet pipe, the rear end of the fourth connecting flange is provided with a first flow guide cavity located inside the gas mixing box, the rear end of the gas mixing box is provided with a fifth connecting flange connected to a sixth connecting flange, and the front end of the fifth connecting flange is provided with a second flow guide cavity located inside the gas mixing box.

[0013] As a further aspect of the present invention: the fourth connecting flange is symmetrically arranged at the front end of the gas mixing box, the fifth connecting flange is located at the middle of the rear end of the gas mixing box, and the aperture of the fifth connecting flange is larger than that of the fourth connecting flange.

[0014] As a further embodiment of the present invention: the rear end of the air blowing box passes through the inner side of the gas flow control cabinet body and is threadedly connected to the gas flow control cabinet body by a fourth bolt; a fixing frame is provided on the inner side of the air blowing box; a servo motor is installed at the rear end of the fixing frame; and a rotating blade is provided at the front end of the servo motor.

[0015] The rear end of the air blowing box is connected to a connecting plate frame via a damping rubber block. The front end of the connecting plate frame is fixedly connected to a first filter screen plate, and the inner side of the connecting plate frame is provided with a second filter screen plate.

[0016] As a further aspect of the present invention: an arc-shaped guide groove is provided on the front side of the air blowing box, and the connecting plate frame and the second filter screen are connected by adhesive bonding.

[0017] As a further aspect of the present invention: the front end of the second intake pipe is connected to a first guide box by a fifth bolt, the front end of the first guide box is fixedly connected to a control box, a ball valve is provided inside the control box, and the front end of the control box is provided with a second guide box connected to the third exhaust pipe.

[0018] The ball valve has an air delivery cavity with the same diameter as the inner holes of the first and second flow guide boxes on its inner side, and a stepper motor that passes through the control box is provided at the upper end of the ball valve.

[0019] As a further embodiment of the present invention: the fifth bolt passes through the second intake pipe and the first guide box, as well as the second guide box and the third exhaust pipe, and is threadedly connected to the nut; the control box and the ball valve are fitted together in a wrapping manner; and the rotation angle of the ball valve is 90°.

[0020] The beneficial effects of this invention are:

[0021] 1. A first exhaust pipe is provided on the lower front side of the gas storage box, and a first one-way valve body connected to the first booster pump is provided at the front end of the first exhaust pipe, and a first connecting flange is provided at the front end of the first one-way valve body, which can output the gas stored in the gas storage box in a directional and quantitative manner as needed.

[0022] Additionally, the lower end of the gas storage box is connected to the third connecting flange via a second exhaust pipe. In special circumstances during the experiment, two, three, or four gases can be fully mixed before being discharged in a concentrated manner, thereby improving the output effect of gas flow.

[0023] 2. An air blowing box is connected to the rear end of the gas mixing box. After the mixed gas is output from the gas mixing box, the fixed frame can be opened to rotate the servo motor. The airflow from the air blowing box is used to blow away and clean the residual gas in the gas mixing box to avoid affecting the subsequent mixing of other gases.

[0024] Additionally, the gas mixing chamber is symmetrically equipped with second air inlets on the left and right sides of the front end. When one second air inlet is closed, the mixed gas is discharged in a concentrated manner. When the other second air inlet is opened, the residual gas is discharged and cleaned. The independent channels can avoid gas mixing. Attached Figure Description

[0025] The invention will now be further described with reference to the accompanying drawings.

[0026] Figure 1 This is a schematic diagram of the overall structure of the gas flow control cabinet body and the movable closing door panel of the present invention;

[0027] Figure 2 This is a schematic cross-sectional view of the connection between the gas flow control cabinet body and the fixed support frame of the present invention.

[0028] Figure 3 This is a schematic diagram of the overall structure of the connection between the fixed support frame and the gas storage box of the present invention;

[0029] Figure 4This is an exploded view of the overall structure of the connection between the fixed support frame and the gas storage box of the present invention;

[0030] Figure 5 This is an exploded view of the overall structure of the connection between the second exhaust pipe and the third connecting flange of the present invention;

[0031] Figure 6 This is a schematic cross-sectional view of the connection between the gas mixing box and the fourth connecting flange of the present invention;

[0032] Figure 7 This is an exploded view of the overall structure of the air blowing box and the connecting plate frame of the present invention;

[0033] Figure 8 This is an exploded view of the overall structure of the control box and ball valve connection of the present invention.

[0034] In the diagram: 1. Gas flow control cabinet body; 2. Movable closing door panel; 201. Sealing element; 3. Fixed support frame; 301. First bolt; 4. Gas storage box; 401. Gas flow meter; 402. First exhaust pipe; 403. First one-way valve body; 404. First booster pump; 405. First connecting flange; 406. Second one-way valve body; 407. Second exhaust pipe; 5. Gas mixing box; 501. Second bolt; 502. First inlet pipe; 503. Second connecting flange; 504. Sealing ring; 505. Third bolt; 506. Second booster pump; 507. Third connecting flange; 508. Fourth connecting flange; 5081. First guide cavity 509. Fifth connecting flange; 5091. Second guide cavity; 5010. Pressure relief valve body; 6. Air blowing box; 601. Fourth bolt; 602. Sixth connecting flange; 603. Carbon dioxide check valve; 604. Fixing bracket; 605. Servo motor; 606. Rotating blade; 607. Connecting plate frame; 608. Damping rubber block; 609. First filter screen; 6010. Second filter screen; 7. Second air inlet pipe; 701. First guide box; 702. Fifth bolt; 703. Nut; 704. Control box; 705. Ball valve; 706. Air delivery cavity; 707. Stepper motor; 708. Second guide box; 709. Third exhaust pipe. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Please see Figure 1-8As shown, the present invention is a gas flow control cabinet.

[0037] Example 1

[0038] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 In this invention, a technical solution is provided: a gas flow control cabinet body 1, a fixed support frame 3 is provided on the inner side of the gas flow control cabinet body 1 to collectively support the gas storage box 4, the lower end of the gas storage box 4 is connected to the gas mixing box 5 through the middle of the fixed support frame 3 via a second one-way valve body 406 for mixing and outputting gas, and a blowing box 6 for cleaning operation is provided on the rear side of the gas mixing box 5.

[0039] Furthermore, movable closing door panels 2 are rotatably connected to the left and right sides of the front end of the gas flow control cabinet body 1, and a sealing element 201 that engages with the gas flow control cabinet body 1 is glued to the rear side of the movable closing door panels 2.

[0040] Furthermore, a gas flow meter 401 is provided at the front end of the gas storage box 4, and a first exhaust pipe 402 located at the front end of the gas storage box 4 is provided on the lower side of the gas flow meter 401. The front end of the first exhaust pipe 402 is connected to a first booster pump 404 through a first one-way valve body 403, and a first connecting flange 405 is provided at the front end of the first booster pump 404.

[0041] The first connecting flange 405 is arranged in four equal parts at the front end of the first booster pump 404.

[0042] Specifically, firstly, the gas-filled gas storage boxes 4 are placed sequentially inside the fixed support frame 3. Then, the first connecting flange 405 is connected to the individual discharge pipes respectively, and the fixed support frame 3 is stably connected to the upper inside of the gas flow control cabinet body 1 by the first bolt 301. The lower end of the fixed support frame 3 is equipped with an inclined bracket, which can stably support and fix the gas storage box 4 as a whole. Since the front end of the gas storage box 4 is equipped with a first exhaust pipe 402 connected to the first one-way valve body 403, when it is necessary to control the flow output of a single gas, the first one-way valve body 403 can be opened to output the gas forward from the first exhaust pipe 402. After being pressurized by the first booster pump 404, the gas is discharged from the discharge pipe connected to the front end of the first connecting flange 405.

[0043] The gas storage box 4 is a sealed cavity with anti-corrosion and anti-explosion properties, capable of storing most gases in the laboratory. At the same time, a gas flow meter 401 is installed on the upper front side of the gas storage box 4 to detect the remaining gas level in real time. A second one-way valve body 406 is provided at the lower end of the gas storage box 4 to connect with the second exhaust pipe 407, enabling the second exhaust pipe 407 to be engaged and installed with the third connecting flange 507 for subsequent operations.

[0044] Example 2

[0045] Please see Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6 In this invention, a technical solution is provided: a gas mixing box 5 is threadedly connected to the gas flow control cabinet body 1 by a second bolt 501, a first air inlet pipe 502 is evenly distributed at the upper end of the gas mixing box 5, a second connecting flange 503 is connected to the upper end of the first air inlet pipe 502 by a sealing ring 504, and a second booster pump 506 is provided at the upper end of the second connecting flange 503.

[0046] The upper end of the second booster pump 506 is provided with a third connecting flange 507 that is connected to the second exhaust pipe 407.

[0047] Furthermore, the front end of the gas mixing box 5 is provided with a fourth connecting flange 508 connected to the second air inlet pipe 7, the rear end of the fourth connecting flange 508 is provided with a first guide cavity 5081 located inside the gas mixing box 5, the rear end of the gas mixing box 5 is provided with a fifth connecting flange 509 connected to the sixth connecting flange 602, and the front end of the fifth connecting flange 509 is provided with a second guide cavity 5091 located inside the gas mixing box 5.

[0048] Furthermore, the fourth connecting flange 508 is symmetrically arranged at the front end of the gas mixing box 5, and the fifth connecting flange 509 is located at the middle of the rear end of the gas mixing box 5. The diameter of the fifth connecting flange 509 is larger than the diameter of the fourth connecting flange 508.

[0049] Specifically, in conjunction with Embodiment 1, when gas is discharged separately, the monitoring of gas flow is relatively limited. Therefore, based on this, the gas storage box 4 is connected and engaged with the third connecting flange 507 via the second exhaust pipe 407. A second booster pump 506 is installed at the lower end of the third connecting flange 507, and a second connecting flange 503 is installed at the lower end of the second booster pump 506. The second connecting flange 503 and the first air inlet pipe 502, which is divided into four equal parts at the upper end of the gas mixing box 5, are engaged and limited by a sealing ring 504. A third bolt 505 is used to thread a connection between the second connecting flange 503 and the gas mixing box 5, which allows the second booster pump 506 to be securely connected to the gas mixing box 5, facilitating gas delivery. In addition, two fourth connecting flanges 508 are provided at the front end of the gas mixing box 5. The fourth connecting flange 508 on the left is connected and engaged with the exhaust pipe, and the fourth connecting flange 508 on the right is connected and engaged with the waste gas pipe.

[0050] When it is necessary to mix and discharge two, three, or four gases, the second one-way valve body 406 can be opened to allow the gas in the gas storage box 4 to enter the second booster pump 506 through the second exhaust pipe 407. After being pressurized by the second booster pump 506, the gas is discharged into the gas mixing box 5. After standing still for a period of time, the two, three, or four gases are mixed and then discharged through the fourth connecting flange 508 on the left side.

[0051] The gas mixing box 5 has a first guide cavity 5081 connected to the fourth connecting flange 508 on its front side. The gas can be guided and discharged in an arc shape. Since the aperture of the first guide cavity 5081 decreases from the inside of the gas mixing box 5 to the front end of the gas mixing box 5, the mixed gas can be pressurized to make the discharge speed faster.

[0052] Example 3

[0053] Please see Figure 2 , Figure 3 and Figure 7 In this invention, a technical solution is provided: the rear end of the air blowing box 6 passes through the inner side of the gas flow control cabinet body 1 and is threadedly connected to the gas flow control cabinet body 1 by the fourth bolt 601. A fixing frame 604 is provided on the inner side of the air blowing box 6, a servo motor 605 is installed at the rear end of the fixing frame 604, and a rotating blade 606 is provided at the front end of the servo motor 605.

[0054] The rear end of the air blowing box 6 is connected to the connecting plate frame 607 by a damping rubber block 608. The front end of the connecting plate frame 607 is fixedly connected to the first filter screen plate 609, and the inner side of the connecting plate frame 607 is provided with the second filter screen plate 6010.

[0055] Furthermore, an arc-shaped guide groove is provided on the front side of the air blowing box 6, and the connecting plate frame 607 and the second filter screen plate 6010 are connected by adhesive bonding.

[0056] Specifically, in embodiment two, after the mixed gas in the gas mixing box 5 is discharged, since the lower end of the gas mixing box 5 is also equipped with a pressure relief valve body 5010, the pressure inside the gas mixing box 5 can be reduced to avoid excessive gas pressure. Since excess mixed gas may remain in the gas mixing box 5 during the discharge process, the servo motor 605 installed on the rear side of the fixing frame 604 is opened, which can drive the rotating blade 606 to rotate synchronously, so that the outside air enters the inside of the blowing box 6 after being filtered by the second filter plate 6010 and the first filter plate 609, and then is discharged into the gas mixing box 5 through the sixth connecting flange 602. The sixth connecting flange 602 is installed in conjunction with the fifth connecting flange 509, and the rear side of the inside of the gas mixing box 5 is provided with a second guide cavity 5091 that is connected to the fifth connecting flange 509, so that air can be discharged into the gas mixing box 5 from the second guide cavity 5091 to clean the mixed gas remaining in the gas mixing box 5.

[0057] The connecting plate frame 607 is engaged with the air blowing box 6 via a damping rubber block 608, and the air blowing box 6 is threadedly connected to the gas flow control cabinet body 1 via a fourth bolt 601. This allows the air blowing box 6 or the connecting plate frame 607 to be disassembled independently after the experimental operation is completed, facilitating maintenance or replacement and improving subsequent technical operations.

[0058] Among them, a carbon dioxide check valve 603 is provided at the connection between the sixth connecting flange 602 and the fifth connecting flange 509. Under the special structure of the carbon dioxide check valve 603, the mixed gas in the gas mixing box 5 cannot flow back into the blowing box 6, while the gas blown out of the blowing box 6 can enter the gas mixing box 5, which can prevent the leakage of the mixed gas.

[0059] Example 4

[0060] Please see Figure 2 , Figure 3 and Figure 8 In this invention, a technical solution is provided: the front end of the second intake pipe 7 is connected to the first guide box 701 by the fifth bolt 702, the front end of the first guide box 701 is fixedly connected to the control box 704, the inner side of the control box 704 is provided with a ball valve 705, and the front end of the control box 704 is provided with a second guide box 708 connected to the third exhaust pipe 709.

[0061] The inner side of the ball valve 705 is provided with an air delivery cavity 706 with the same diameter as the inner side of the first guide box 701 and the second guide box 708. The upper end of the ball valve 705 is provided with a stepper motor 707 that passes through the control box 704.

[0062] Furthermore, the fifth bolt 702 passes through the second intake pipe 7 and the first guide box 701, as well as the second guide box 708 and the third exhaust pipe 709, and is threadedly connected to the nut 703. The control box 704 and the ball valve 705 are fitted together in a wrap-around manner, and the rotation angle of the ball valve 705 is 90°.

[0063] Specifically, in conjunction with Embodiments 2 and 3, a second air inlet pipe 7 is installed at the front end of the fourth connecting flange 508. When it is necessary to centrally discharge the mixed gas, the second air inlet pipe 7 at the front end of the left fourth connecting flange 508 is opened. At this time, the stepper motor 707 is driven to rotate the ball valve 705 that is wrapped and fitted inside the control box 704, so that the gas delivery cavity 706 that is opened through the ball valve 705 is aligned with the cavities opened at the front and rear ends of the control box 704, so that the mixed gas can be discharged outward from the third exhaust pipe 709. The connection between the second air inlet pipe 7 and the first guide box 701, as well as the second guide box 708 and the third exhaust pipe 709, is provided with a fifth bolt 702. When the fifth bolt 702 passes through the second air inlet pipe 7 and the first guide box 701 and the second guide box 708 and the third exhaust pipe 709 in sequence, it can be threaded with the nut 703, thereby improving the connection stability between the second air inlet pipe 7 and the third exhaust pipe 709 and the control box 704.

[0064] After the mixed gas is discharged, the control box 704 located at the front end of the fourth connecting flange 508 on the left is closed, causing the ball valve 705 to rotate 90°, thus misaligning the gas delivery cavity 706 with the cavity position of the control box 704. At this time, the control box 704 located at the front end of the fourth connecting flange 508 on the right is opened, aligning the gas delivery cavity 706 inside the ball valve 705 with the cavity inside the control box 704. This allows the air from the air blowing box 6 to blow out, so that the remaining excess mixed gas is discharged from the third exhaust pipe 709 along the waste gas pipe. This one-way independent control allows for centralized discharge of the mixed gas and cleaning and discharge of residual mixed gas.

[0065] The inner sides of the first flow guide box 701 and the second flow guide box 708 are designed with a smaller aperture from the outside to the inside, which can make the gas output more closed and increase the sealing effect.

[0066] The front left and right sides of the gas flow control cabinet body 1 are rotatably connected to movable closing door panels 2 via hinged chains. The rear surface of the movable closing door panels 2 is bonded with a sealing element 201 that engages with the gas flow control cabinet body 1. After use, the gas flow control cabinet body 1 is closed and in a relatively sealed state, preventing dust in the air from entering the gas flow control cabinet body 1. In addition, the inner side of the sealing element 201 is provided with a hygroscopic polymer material, which can absorb moisture at the connection points of the fixed support frame 3 and the gas flow control cabinet body 1, the second exhaust pipe 407 and the third connecting flange 507, the second connecting flange 503 and the gas mixing box 5, the fourth connecting flange 508 and the second air inlet pipe 7, the fifth connecting flange 509 and the sixth connecting flange 602, the air blowing box 6 and the gas flow control cabinet body 1, the nut 703 and the first flow guide box 701, and the second flow guide box 708 and the third exhaust pipe 709, preventing rust or corrosion caused by prolonged humid environment.

[0067] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A gas flow control cabinet, characterized by, The system includes a gas flow control cabinet body (1), and a fixed support frame (3) is provided on the inner side of the gas flow control cabinet body (1) to collectively support the gas storage box (4). The lower end of the gas storage box (4) is connected to the gas mixing box (5) through the middle of the fixed support frame (3) via a second one-way valve body (406) for mixing and outputting gas. A blowing box (6) for cleaning operation is provided on the rear side of the gas mixing box (5). The rear end of the air blowing box (6) passes through the inner side of the gas flow control cabinet body (1) and is threadedly connected to the gas flow control cabinet body (1) by the fourth bolt (601). A fixing frame (604) is provided on the inner side of the air blowing box (6). A servo motor (605) is installed at the rear end of the fixing frame (604). A rotating blade (606) is provided at the front end of the servo motor (605). The rear end of the air blowing box (6) is connected to a connecting plate frame (607) by a damping rubber block (608). The front end of the connecting plate frame (607) is fixedly connected to a first filter screen plate (609). A second filter screen plate (6010) is provided on the inner side of the connecting plate frame (607). The front end of the second intake pipe (7) is connected to the first guide box (701) by the fifth bolt (702). The front end of the first guide box (701) is fixedly connected to the control box (704). A ball valve (705) is provided inside the control box (704). The front end of the control box (704) is provided with a second guide box (708) connected to the third exhaust pipe (709). The inner side of the ball valve (705) is provided with an air delivery cavity (706) with the same diameter as the inner side of the first guide box (701) and the second guide box (708). The upper end of the ball valve (705) is provided with a stepper motor (707) that passes through the control box (704). The fifth bolt (702) passes through the second intake pipe (7) and the first guide box (701), as well as the second guide box (708) and the third exhaust pipe (709), and is threadedly connected to the nut (703). The control box (704) and the ball valve (705) are fitted together in a wrapping manner. The rotation angle of the ball valve (705) is 90°. After the mixed gas is discharged, the control box (704) set at the front end of the fourth connecting flange (508) on the left is closed, and the ball valve (705) is rotated 90° so that the gas delivery cavity (706) is offset from the cavity position of the control box (704). At this time, the control box (704) set at the front end of the fourth connecting flange (508) on the right is opened so that the gas delivery cavity (706) opened inside the ball valve (705) is aligned with the cavity inside the control box (704), so that the air in the blowing box (6) is blown out and the residual excess mixed gas is discharged from the third exhaust pipe (709) along the sewage pipe. The one-way independent control can control whether the mixed gas is discharged in a concentrated manner and the cleaning and discharge of residual mixed gas.

2. A gas flow control cabinet according to claim 1, characterized in that The front left and right sides of the gas flow control cabinet body (1) are rotatably connected to movable closing door panels (2), and the rear side of the movable closing door panels (2) is bonded with a sealing element (201) that engages with the gas flow control cabinet body (1).

3. A gas flow control cabinet according to claim 1, characterized in that A gas flow meter (401) is provided at the front end of the gas storage box (4). A first exhaust pipe (402) located at the front end of the gas storage box (4) is provided on the lower side of the gas flow meter (401). A first booster pump (404) is connected to the front end of the first exhaust pipe (402) through a first one-way valve body (403). A first connecting flange (405) is provided at the front end of the first booster pump (404). The first connecting flange (405) is arranged in four equal parts at the front end of the first booster pump (404).

4. A gas flow control cabinet according to claim 1, characterized in that The gas mixing box (5) is threadedly connected to the gas flow control cabinet body (1) by a second bolt (501). The upper end of the gas mixing box (5) is provided with a first air inlet pipe (502) evenly distributed. The upper end of the first air inlet pipe (502) is connected to a second connecting flange (503) by a sealing ring (504). The upper end of the second connecting flange (503) is provided with a second booster pump (506). The upper end of the second booster pump (506) is provided with a third connecting flange (507) that is connected to the second exhaust pipe (407).

5. A gas flow control cabinet according to claim 4, characterised in that, The front end of the gas mixing box (5) is provided with a fourth connecting flange (508) connected to the second air inlet pipe (7). The rear end of the fourth connecting flange (508) is provided with a first flow guide cavity (5081) located inside the gas mixing box (5). The rear end of the gas mixing box (5) is provided with a fifth connecting flange (509) connected to the sixth connecting flange (602). The front end of the fifth connecting flange (509) is provided with a second flow guide cavity (5091) located inside the gas mixing box (5).

6. A gas flow control cabinet according to claim 5, characterised in that, The fourth connecting flange (508) is symmetrically arranged at the front end of the gas mixing box (5), and the fifth connecting flange (509) is located at the middle of the rear end of the gas mixing box (5). The aperture of the fifth connecting flange (509) is larger than that of the fourth connecting flange (508).

7. A gas flow control cabinet according to claim 1, characterized in that An arc-shaped guide groove is provided on the front side of the air blowing box (6), and the connecting plate frame (607) is bonded to the second filter screen plate (6010).

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