Air duct gas liquefaction backflow prevention device for laboratory

Abstract

The utility model discloses a laboratory ventilation pipeline gas liquefaction backflow prevention device which comprises a ventilation pipe, a heating mechanism is installed in the ventilation pipe, a guide pipe is installed at the outer end of the ventilation pipe, and an induced draft fan is installed at the top end of the guide pipe. The heating mechanism comprises a heating plate, the top end of the heating plate abuts against an electrifying strip, an inserting hole is formed in the top end of the ventilation pipe, the bottom end of the electrifying strip penetrates through the inserting hole, the heating plate is installed in the ventilation pipe, a ventilation hole is formed in the surface of the heating plate, and a sealing ring is bonded to the outer surface of the heating plate. The sealing ring tightly abuts against the inner surface of the ventilation pipe. The heating plate is installed in the ventilation pipeline, and the heating plate is electrified and heated through the electrifying strip, so that the heating plate is installed in the ventilation pipe, circulating air flows out of the ventilation holes and is heated, the flowing-out air and external air are reduced, and condensate caused by too large temperature difference is avoided.

Description

Technical Field

[0001] This utility model relates to the field of ventilation duct technology, and in particular to a gas liquefaction prevention and backflow prevention device for laboratory ventilation ducts. Background Technology

[0002] Social development and scientific progress are inseparable from experiments. A good experimental environment not only positively influences experimental results but also protects the health of experimental personnel. Nowadays, gas emissions are unavoidable in experiments across various industries. When the temperature difference between the outside environment and the emitted gas is small, the liquefaction rate of the emitted gas in the pipeline is low. However, if the temperature difference is large, a large amount of condensed water droplets will form in the pipeline, causing backflow. This backflow not only affects the experimental environment but can also contaminate reagents, potentially leading to experimental failure.

[0003] Existing laboratory ventilation duct gas liquefaction and backflow prevention devices exhaust air from the laboratory through the outer outlet of the ventilation duct. The air in the circulating space is heated by a heating structure. However, the heating structure is relatively fixed and inconvenient to disassemble, install, clean, and maintain. After long-term use, the heating structure is prone to rust and dust and dirt accumulation, making it difficult to heat the circulating air. Moreover, the ventilation duct is open on the outside, and when there is no air circulation inside, external insects such as mosquitoes, rodents, and flies can easily enter the ventilation duct and then the laboratory, affecting the safety and normal use of the laboratory.

[0004] Therefore, a gas liquefaction and backflow prevention device for laboratory ventilation ducts is proposed to solve the problems mentioned above. Utility Model Content

[0005] The purpose of this utility model is to address the aforementioned technical problems by providing a gas liquefaction and backflow prevention device for laboratory ventilation ducts. This device allows for the installation of a heating plate inside the ventilation duct, as well as the disassembly, installation, cleaning, and maintenance of the heating plate. It also intercepts foreign objects such as mosquitoes, rodents, and flies from entering the laboratory through the ventilation duct.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a gas liquefaction and backflow prevention device for laboratory ventilation ducts, comprising a ventilation duct, wherein a heating mechanism is installed inside the ventilation duct, a guide pipe is installed at the outer end of the ventilation duct, and an exhaust fan is installed at the top end of the guide pipe;

[0007] The heating mechanism includes a heating plate, the top of which is abutted against an electric strip. The top of the ventilation pipe has a plug hole, the bottom of which passes through the plug hole. The heating plate is installed inside the ventilation pipe, and the surface of the heating plate has ventilation holes. A sealing ring is bonded to its outer surface, and the sealing ring tightly abuts against the inner surface of the ventilation pipe.

[0008] Preferably, one end of the ventilation duct is fixed with a connecting frame, which is horizontally arranged, and the guide duct is vertically arranged, with its upper and lower ends being open.

[0009] Preferably, the ventilation duct has an exhaust groove at its inner bottom. The exhaust groove is a long strip structure and is inclined downwards, with its inner end close to the heating plate.

[0010] Preferably, the guide tube has through grooves in the middle of both sides, one of the through grooves is connected to the air outlet of the ventilation tube, and the other through groove has a first connecting rod fixed at the four corners of its outer side.

[0011] Preferably, a mounting rod is fixed to the outer side of the heating plate, and a mounting plate is fixed to the outer end of the mounting rod. The mounting plate is connected to the outer side of the guide tube and covers the through groove. Mounting holes are opened at the four corners of the surface of the mounting plate. The first connecting rod slides through the mounting holes, and a first nut is connected to its surface. The first nut abuts against the outer side of the mounting plate.

[0012] Preferably, a connecting plate is fixed to the outer side of the air outlet end of the ventilation duct, a sealing gasket is bonded to the side of the connecting plate, the sealing gasket abuts against the outer side of the guide tube, a connecting hole is opened on the surface of the connecting plate, a second connecting rod is fixed to the outer side of the guide tube, the second connecting rod slides through the connecting hole, a second nut is connected to its surface, and the second nut abuts against the outer side of the connecting plate.

[0013] Preferably, a support bar is fixed to the top of the inside of the guide tube, and the blower is fixedly installed at the top of the support bar, which is horizontally positioned.

[0014] Compared with the prior art, this utility model provides a gas liquefaction and backflow prevention device for laboratory ventilation ducts, which has the following beneficial effects:

[0015] 1. This utility model involves installing a heating plate inside a ventilation duct and heating the heating plate by passing an electric strip through it. Thus, the heating plate is installed inside the ventilation duct, and the air flowing out from the ventilation hole is heated, reducing the temperature difference between the outflowing air and the outside air and avoiding excessive temperature difference that could lead to condensation.

[0016] 2. In this utility model, the guide tube and the ventilation tube are detachably connected by a second connecting rod and a connecting plate. An mounting rod is fixed on the outside of the heating plate, and the mounting plate and the guide tube are detachably connected by a first connecting rod. Therefore, the heating plate can be disassembled and installed from the through groove, which is convenient for cleaning and maintenance.

[0017] 3. In this utility model, a heating plate is tightly installed inside the ventilation pipe through a sealing ring, and ventilation holes are provided on its surface, which can intercept foreign objects such as mosquitoes, rodents and flies from entering the laboratory through the ventilation pipe.

[0018] The parts of this device not covered herein are the same as or can be implemented using existing technologies. This utility model has a simple structure and is easy to operate. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a gas liquefaction and backflow prevention device for laboratory ventilation ducts proposed in this utility model;

[0020] Figure 2 This is a schematic diagram of the guide tube portion of a gas liquefaction and backflow prevention device for laboratory ventilation ducts proposed in this utility model;

[0021] Figure 3 This is a schematic diagram of the internal structure of a gas liquefaction and backflow prevention device for laboratory ventilation ducts proposed in this utility model.

[0022] Figure 4 This is a schematic diagram of the mounting plate and heating plate of a gas liquefaction and backflow prevention device for laboratory ventilation ducts proposed in this utility model.

[0023] In the diagram: 1. Ventilation duct; 2. Connecting frame; 3. Heating plate; 4. Ventilation hole; 5. Power strip; 6. Second connecting rod; 7. Second nut; 8. Connecting plate; 9. Sealing gasket; 10. Guide tube; 11. Exhaust fan; 12. Support strip; 13. First connecting rod; 14. Mounting plate; 15. Through groove; 16. First nut; 17. Drain groove; 18. Insertion hole; 19. Connecting hole; 20. Mounting hole; 21. Mounting rod; 22. Sealing ring. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this 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 this utility model.

[0026] Example 1: A gas liquefaction and backflow prevention device for laboratory ventilation ducts, such as... Figures 1-4 As shown, it includes a ventilation pipe 1, a heating mechanism is installed inside the ventilation pipe 1, a guide pipe 10 is installed at the outer end of the ventilation pipe 1, and an induced draft fan 11 is installed at the top of the guide pipe 10.

[0027] The heating mechanism includes a heating plate 3, with an electric strip 5 abutting at the top of the heating plate 3. A plug hole 18 is opened at the top of the ventilation pipe 1, and the bottom end of the electric strip 5 passes through the plug hole 18. The heating plate 3 is installed inside the ventilation pipe 1. Ventilation holes 4 are opened on the surface of the heating plate 3, and a sealing ring 22 is bonded to its outer surface. The sealing ring 22 is tightly abutting against the inner surface of the ventilation pipe 1.

[0028] In use, a heating plate 3 is installed inside the ventilation pipe 1, and the heating plate 3 is heated by an electric strip 5. Thus, the heating plate 3 is installed inside the ventilation pipe 1, and the circulating air flows out from the ventilation hole 4 and is heated, reducing the temperature difference between the outflowing air and the outside air, and avoiding the formation of condensate due to excessive temperature difference.

[0029] The heating plate 3 is tightly installed inside the ventilation pipe 1 through the sealing ring 22, and ventilation holes 4 are provided on its surface to intercept foreign objects such as mosquitoes, rats and flies from entering the laboratory through the ventilation pipe 1.

[0030] Example 2: A gas liquefaction and backflow prevention device for laboratory ventilation ducts, such as... Figures 1-4 As shown, a connecting frame 2 is fixed at one end of the ventilation pipe 1, which is set horizontally, and the guide pipe 10 is set vertically, with its upper and lower ends being open.

[0031] The bottom of the ventilation pipe 1 has an exhaust groove 17. The exhaust groove 17 is a long strip structure and is set at an angle downwards, with its inner end close to the heating plate 3.

[0032] The guide tube 10 has through grooves 15 in the middle of both sides. One through groove 15 is connected to the air outlet of the ventilation tube 1, and the other through groove 15 has a first connecting rod 13 fixed at the four corners of its outer side.

[0033] A mounting rod 21 is fixed to the outside of the heating plate 3. A mounting plate 14 is fixed to the outer end of the mounting rod 21. The mounting plate 14 is connected to the outside of the guide tube 10 and covers the through groove 15. Mounting holes 20 are opened at the four corners of the surface of the mounting plate 14. The first connecting rod 13 slides through the mounting hole 20. A first nut 16 is connected to its surface. The first nut 16 abuts against the outside of the mounting plate 14.

[0034] A connecting plate 8 is fixed to the outside of the air outlet of the ventilation duct 1. A sealing gasket 9 is bonded to the side of the connecting plate 8. The sealing gasket 9 abuts against the outside of the guide tube 10. A connecting hole 19 is opened on the surface of the connecting plate 8. A second connecting rod 6 is fixed to the outside of the guide tube 10. The second connecting rod 6 slides through the connecting hole 19. A second nut 7 is connected to its surface. The second nut 7 abuts against the outside of the connecting plate 8.

[0035] A support bar 12 is fixed to the top of the inside of the guide tube 10, and the blower 11 is fixedly installed on the top of the support bar 12. The support bar 12 is set horizontally.

[0036] By installing the exhaust fan 11, the air circulation inside the ventilation duct 1 can be accelerated.

[0037] In use, the guide tube 10 and the ventilation tube 1 are detachably connected by the second connecting rod 6 and the connecting plate 8. The mounting rod 21 is fixed on the outside of the heating plate 3, and the mounting plate 14 is detachably connected to the guide tube 10 by the first connecting rod 13. Therefore, the heating plate 3 can be disassembled and installed from the through groove 15, which is convenient for cleaning and maintenance.

[0038] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A backflow prevention device for liquefying gases in a laboratory ventilation duct, comprising a ventilation duct (1), characterized in that: A heating mechanism is installed inside the ventilation pipe (1), a guide pipe (10) is installed at the outer end of the ventilation pipe (1), and an exhaust fan (11) is installed at the top of the guide pipe (10). The heating mechanism includes a heating plate (3), the top of which is abutted by an electric strip (5), the top of which is a plug hole (18), the bottom of which is a plug hole (18) passes through the plug hole (18), the heating plate (3) is installed inside the ventilation pipe (1), the surface of the heating plate (3) is a ventilation hole (4), and a sealing ring (22) is bonded to its outer surface, the sealing ring (22) tightly abutting against the inner surface of the ventilation pipe (1).

2. A backflow prevention device for liquefying gas in a laboratory ventilation duct according to claim 1, characterized in that One end of the ventilation pipe (1) is fixed with a connecting frame (2), which is set horizontally, and the guide pipe (10) is set vertically, with its upper and lower ends being open.

3. A backflow prevention device for liquefying gas in a laboratory ventilation duct according to claim 1, characterized in that The ventilation pipe (1) has an exhaust groove (17) at its bottom. The exhaust groove (17) is a long strip structure and is inclined downwards, with its inner end close to the heating plate (3).

4. The backflow prevention device for liquefying gas in a ventilation duct for a laboratory according to claim 1, wherein The guide tube (10) has through slots (15) in the middle of both sides. One of the through slots (15) is connected to the air outlet of the ventilation tube (1), and the other through slot (15) has a first connecting rod (13) fixed at the four corners of its outer side.

5. A backflow prevention device for liquefying gases in a laboratory ventilation duct according to claim 4, characterized in that An installation rod (21) is fixed to the outside of the heating plate (3), and an installation plate (14) is fixed to the outer end of the installation rod (21). The installation plate (14) is connected to the outside of the guide tube (10) and covers the through groove (15). Installation holes (20) are opened at the four corners of the surface of the installation plate (14). The first connecting rod (13) slides through the installation hole (20), and a first nut (16) is connected to its surface. The first nut (16) abuts against the outside of the installation plate (14).

6. A backflow prevention device for liquefying gases in a laboratory ventilation duct according to claim 1, characterized in that A connecting plate (8) is fixed to the outside of the air outlet of the ventilation pipe (1). A sealing gasket (9) is bonded to the side of the connecting plate (8). The sealing gasket (9) abuts against the outside of the guide pipe (10). A connecting hole (19) is opened on the surface of the connecting plate (8). A second connecting rod (6) is fixed to the outside of the guide pipe (10). The second connecting rod (6) slides through the connecting hole (19). A second nut (7) is connected to its surface. The second nut (7) abuts against the outside of the connecting plate (8).

7. A gas liquefaction and backflow prevention device for laboratory ventilation ducts according to claim 1, characterized in that, The guide tube (10) has a support bar (12) fixed at its inner top end, and the blower (11) is fixedly installed at the top end of the support bar (12). The support bar (12) is set horizontally.

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