A device for preventing liquid backflow in a ventilation system

Abstract

This utility model discloses a liquid backflow prevention device for a ventilation system, including a fitting frame and a duct. The fitting frame is located at the lower end of the duct, and a liquid drain pipe is connected to the middle of the lower end of the duct. Positioning blocks are fixed on both sides of the duct, and an adjustment chamber is provided inside each positioning block. A slot is provided on one side of the adjustment chamber, and a slot is provided in the middle of the slot. A pull rod is provided inside the adjustment chamber, with a handle fixed to one end of the pull rod and a locking block fixed to the other end of the pull rod, engaging with the slot. A spring connects one end of the locking block to one end inside the adjustment chamber. Insert blocks are fixed on both sides of the upper end of the fitting frame, engaging with the locking block and the slot. This utility model is designed for easy assembly and disassembly, facilitating liquid handling.

Description

Technical Field

[0001] This utility model relates to the field of ventilation system technology, specifically to a device for preventing liquid backflow in a ventilation system. Background Technology

[0002] Ventilation is a building environment control technology that uses methods such as air exchange and dilution or ventilation to control the spread and harm of air pollutants and ensure the quality of indoor and outdoor air environment. A ventilation system is a complete set of devices that realizes the function of ventilation, including air inlets, air outlets, air supply ducts, fans, cooling and heating, filters, control systems and other auxiliary equipment. During scientific research experiments, water vapor generated by instruments condenses on the ventilation duct walls, causing the condensate to flow back into the fume hood. This situation is particularly obvious in the humid plum rain season in the south.

[0003] Common ventilation system ducts have some drawbacks. First, they are not easy to disassemble and install, and require labor for maintenance. Second, they are not convenient for handling liquids, as acidic or alkaline substances in the liquids may affect experimental results and have adverse effects on the environment. Utility Model Content

[0004] The purpose of this utility model is to provide a device for preventing liquid backflow in a ventilation system, so as to solve the problems mentioned in the background art, such as inconvenience in disassembly and assembly, and inconvenience in liquid handling.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a device for preventing liquid backflow in a ventilation system, comprising a fitting frame and a duct. The fitting frame is disposed at the lower end of the duct, and a drain pipe is connected to the middle of the lower end of the duct. Positioning blocks are fixed on both sides of the duct, and an adjustment chamber is provided inside each positioning block. A slot is provided on one side of each adjustment chamber, and a groove is provided in the middle of the slot. A pull rod is provided inside the adjustment chamber, and a handle is fixed to one end of the pull rod. The other end of the pull rod is fixed with a locking block, which engages with the slot. One end of the locking block is connected to one end inside the adjustment chamber by a spring. The pull handle can be pulled outwards on both sides to move the pull rod outwards and the locking block to make way for the insert block. The fitting frame is then fitted to the lower part of the air duct, so that the air duct is in the middle of the fitting frame and the insert block is inserted into the slot. Then the pull handle is released, and under the elastic action of the spring, the locking block returns to its original position, allowing it to be inserted into the slot and fixed. This allows the fitting frame to be installed.

[0006] As a further technical solution of this utility model, both sides of the upper end of the fitting frame are fixed with insert blocks, and the insert blocks are engaged with the card blocks and the insert blocks are engaged with the slots.

[0007] As a further technical solution of this utility model, the inner wall of the fitting frame is provided with a sealing sheet, and the lower end of the fitting frame is provided with an anti-backflow sleeve. The shape of the fitting frame is an irregular shape that fits the air duct, and the sealing sheet fits the outer wall of the air duct, which helps to improve the sealing performance of the device.

[0008] As a further technical solution of this utility model, a processing chamber is provided at the upper end of the anti-backflow sleeve, and a support frame is provided in the processing chamber. The support frame can be inserted into the processing chamber so that the liquid dripping from the lower pipe passes through the packing.

[0009] As a further technical solution of this utility model, the upper end of the support frame is provided with filler, and the lower end of the support frame is provided with a receiving mesh layer. The filler is activated carbon, which can effectively adsorb acid and alkaline substances. The receiving mesh layer has several through holes, which can support the filler, block large particulate impurities, and facilitate the flow of liquid.

[0010] As a further technical solution of this utility model, a liquid storage tank is provided at the lower end of the anti-backflow sleeve, and a guide pipe is provided at the lower end of the liquid storage tank. The liquid storage tank is used to collect the liquid accumulated inside the air duct and prevent the liquid from flowing back.

[0011] As a further technical solution of this utility model, a plug is provided on the outside of the lower end of the guide tube, and the plug is threadedly engaged with the outer wall of the guide tube. When it is necessary to discharge liquid, simply rotate the plug to separate it from the guide tube.

[0012] Compared with the prior art, the advantages of this utility model are: easy to disassemble and assemble, and convenient for liquid handling.

[0013] By pulling the handles outwards on both sides, the pull rod moves outwards, the spring compresses, and the locking block moves, making room for the insertion block. The fitting frame is then fitted to the lower part of the duct, so that the duct is in the middle of the fitting frame and the insertion block is inserted into the slot. Then, the handles are released, and under the elastic action of the spring, the pull rod moves the locking block back to its original position, allowing the locking block to be inserted into the slot and fixed. This allows the fitting frame to be installed. Consequently, the shape of the fitting frame is adapted to fit the irregular shape of the duct, and the sealing sheet fits the outer wall of the duct, which helps to improve the sealing performance of the device and makes it easy to disassemble and assemble.

[0014] The support frame can be inserted into the treatment chamber, allowing the liquid dripping from the drain pipe to pass through the packing material, which is activated carbon, to effectively adsorb acidic and alkaline substances. The receiving mesh layer has several through holes, which can support the packing material, intercept large particles of impurities, and facilitate liquid flow. Subsequently, the liquid storage chamber is used to collect the liquid accumulated inside the duct and prevent liquid backflow. When it is necessary to drain the liquid, simply rotate the plug to separate it from the guide pipe, which facilitates liquid treatment. Attached Figure Description

[0015] Figure 1 This is a cross-sectional structural diagram of a ventilation system anti-liquid backflow treatment device according to the present invention;

[0016] Figure 2 This is a schematic diagram of the structure of a ventilation system anti-liquid backflow treatment device according to the present invention;

[0017] Figure 3 This is a schematic diagram of the duct and positioning block structure of this utility model;

[0018] Figure 4 This is a schematic diagram of the support frame and filler structure of this utility model.

[0019] In the diagram: 1. Air duct; 2. Positioning block; 3. Pull handle; 4. Fitting frame; 5. Treatment chamber; 6. Liquid storage chamber; 7. Block; 8. Guide pipe; 9. Anti-backflow sleeve; 10. Support frame; 11. Packing; 12. Downflow pipe; 13. Sealing plate; 14. Pull rod; 15. Adjustment chamber; 16. Locking block; 17. Slot; 18. Slot; 19. Insert block; 20. Spring; 21. Receiving mesh layer. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-4 The present invention provides an embodiment of a ventilation system anti-liquid backflow treatment device, comprising a fitting frame 4 and a duct 1. The fitting frame 4 is disposed at the lower end of the duct 1. A liquid drain pipe 12 is connected to the middle of the lower end of the duct 1. Positioning blocks 2 are fixed on both sides of the duct 1. An adjustment chamber 15 is disposed inside the positioning block 2. A slot 18 is disposed on one side of the adjustment chamber 15. A slot 17 is disposed in the middle of the slot 18. A pull rod 14 is disposed inside the adjustment chamber 15. A handle 3 is fixed to one end of the pull rod 14. A locking block 16 is fixed to the other end of the pull rod 14. The locking block 16 engages with the slot 18. A spring 20 is connected between one end of the locking block 16 and one end inside the adjustment chamber 15.

[0022] Specifically, such as Figure 1 and Figure 3As shown, the pull handle 3 can be pulled outwards on both sides, causing the pull rod 14 to move outwards and the spring 20 to compress, thereby causing the locking block 16 to move to make way for the insertion block 19, so that the fitting frame 4 is attached to the lower part of the air duct 1, so that the air duct 1 is in the middle of the fitting frame 4 and the insertion block 19 is inserted into the slot 17. Then, the pull handle 3 is released, and under the elastic action of the spring 20, the pull rod 14 drives the locking block 16 to reset, so that the locking block 16 is inserted into the slot 17 to fix the locking block 16, thereby installing the fitting frame 4.

[0023] Both sides of the upper end of the fitting frame 4 are fixed with insert blocks 19, and the insert blocks 19 are engaged with the card block 16 and the slot 17. The inner wall of the fitting frame 4 is provided with a sealing sheet 13, and the lower end of the fitting frame 4 is provided with an anti-backflow sleeve 9.

[0024] Specifically, such as Figure 1 and Figure 3 As shown, the shape of the fitting frame 4 is an irregular shape that fits the air duct 1, and the sealing sheet 13 fits the outer wall of the air duct 1, which helps to improve the sealing performance of the device.

[0025] The upper part of the anti-backflow sleeve 9 is provided with a processing chamber 5, and a support frame 10 is provided in the processing chamber 5;

[0026] Specifically, such as Figure 1 and Figure 4 As shown, the support frame 10 can be inserted into the processing chamber 5 so that the liquid dripping from the lower pipe 12 passes through the packing 11.

[0027] The upper end of the support frame 10 is provided with filler 11, and the lower end of the support frame 10 is provided with a supporting mesh layer 21.

[0028] Specifically, such as Figure 1 and Figure 4 As shown, the filler 11 is activated carbon, which can effectively adsorb acid and alkali substances. The receiving mesh layer 21 has several through holes, which can support the filler 11, block large particulate impurities, and facilitate the flow of liquid.

[0029] The lower end of the anti-backflow sleeve 9 is provided with a liquid storage tank 6, and the lower end of the liquid storage tank 6 is provided with a guide pipe 8. The lower end of the guide pipe 8 is provided with a block 7, and the block 7 is threadedly engaged with the outer wall of the guide pipe 8.

[0030] Specifically, such as Figure 1 and Figure 4 As shown, the liquid storage tank 6 is used to collect the liquid accumulated inside the air duct 1 and prevent the liquid from flowing back. When it is necessary to drain the liquid, simply rotate the plug 7 to separate it from the guide pipe 8.

[0031] Working principle: In use, the support frame 10 can be inserted into the treatment chamber 5, so that the liquid dripping from the lower pipe 12 passes through the packing 11. Then, the pull handles 3 can be pulled outwards on both sides, causing the pull rod 14 to move outwards and the spring 20 to compress, thereby causing the locking block 16 to move, making room for the insertion block 19, so that the fitting frame 4 is fitted to the lower part of the air duct 1, so that the air duct 1 is in the middle of the fitting frame 4 and the insertion block 19 is inserted into the slot 17. Then, the pull handle 3 is released. Under the elastic action of the spring 20, the pull rod 14 drives the locking block 16 to reset, so that the locking block 16 is inserted into the slot 17, thus fixing the locking block 16. The fitting frame 4 is installed, and its shape is adapted to fit the irregular shape of the air duct 1. The sealing sheet 13 fits the outer wall of the air duct 1, which helps to improve the sealing performance of the device. Then, the filler 11 is activated carbon, which can effectively adsorb acid and alkali substances. The receiving mesh layer 21 has several through holes, which can support the filler 11, block large particles of impurities, and facilitate the flow of liquid. Subsequently, the liquid storage tank 6 is used to collect the liquid accumulated inside the air duct 1 and prevent liquid backflow. When it is necessary to drain the liquid, simply rotate the plug 7 to separate it from the guide pipe 8. In summary, the device is easy to disassemble and assemble, and facilitates liquid treatment.

[0032] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A liquid backflow prevention device for a ventilation system comprising a fitting frame (4) and a duct (1), characterized in that: The fitting frame (4) is set at the lower end of the air duct (1). The middle of the lower end of the air duct (1) is connected to the liquid drain pipe (12). Positioning blocks (2) are fixed on both sides of the air duct (1). An adjustment chamber (15) is set inside the positioning block (2). A slot (18) is set on one side of the adjustment chamber (15). A slot (17) is set in the middle of the slot (18). A pull rod (14) is set inside the adjustment chamber (15). A handle (3) is fixed at one end of the pull rod (14). A locking block (16) is fixed at the other end of the pull rod (14). The locking block (16) is engaged with the slot (18). A spring (20) is connected between one end of the locking block (16) and one end inside the adjustment chamber (15).

2. The liquid backflow prevention device for a ventilation system according to claim 1, wherein: Both sides of the upper end of the fitting frame (4) are fixed with inserts (19), and the inserts (19) are engaged with the card block (16) and the inserts (19) are engaged with the slot (17).

3. A liquid backflow prevention device for a ventilation system according to claim 2, characterized in that: The inner wall of the fitting frame (4) is provided with a sealing sheet (13), and the lower end of the fitting frame (4) is provided with an anti-backflow sleeve (9).

4. The liquid backflow prevention device for a ventilation system according to claim 3, wherein: The upper part of the anti-backflow sleeve (9) is provided with a processing chamber (5), and a support frame (10) is provided in the processing chamber (5).

5. A liquid backflow prevention device for a ventilation system according to claim 4, characterized in that: The upper end of the support frame (10) is provided with filler (11), and the lower end of the support frame (10) is provided with a supporting mesh layer (21).

6. A liquid backflow prevention device for a ventilation system according to claim 4, characterized in that: The lower end of the anti-backflow sleeve (9) is provided with a liquid storage tank (6), and the lower end of the liquid storage tank (6) is provided with a guide pipe (8).

7. A liquid backflow prevention device for a ventilation system according to claim 6, characterized in that A plug (7) is provided on the outside of the lower end of the guide pipe (8), and the plug (7) is threadedly engaged with the outer wall of the guide pipe (8).

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