Air respirator ram air filtration system

Abstract

The utility model belongs to gas filtration technical field relates to a kind of air respirator punch gas filter system, including primary wet filter cartridge, secondary self refrigeration dehumidification filter cartridge and tertiary adsorption filter cartridge group. Condenser pipeline with orifice is equipped in secondary filter cartridge;And, clean dry gas of system is guided back to the condenser pipeline of secondary filter cartridge by reflux pipeline from the outlet of tertiary filter cartridge group. The throttling refrigeration effect produced by the clean gas through orifice makes low-temperature condensing surface form in secondary filter cartridge, so that water vapor in main stream gas is efficiently removed, and gas supply quality is significantly improved.

Description

Technical Field

[0001] This utility model relates to an air respirator pressurized gas filtration system, belonging to the field of gas filtration technology. Background Technology

[0002] Self-contained breathing apparatus (SCBA) is a critical piece of equipment for ensuring the safety of workers in fields such as firefighting, chemical engineering, and mining. The purity of the gas it is filled with is of paramount importance. Therefore, it is usually necessary to equip it with a high-pressure air filtration system to purify the gas source.

[0003] Existing high-pressure filtration systems typically employ multi-stage filtration in series, such as a three-stage filtration scheme of "wet filtration + condensation filtration + adsorption filtration." Wet filtration primarily removes large particulate impurities and oil, while adsorption filtration mainly removes odors and trace gaseous pollutants. Previously, the intermediate condensation filter often relied solely on simple physical collisions or filter media interception to remove residual moisture after the first stage of filtration. Its efficiency in removing minute water vapor in aerosol form was limited, causing subsequent adsorption filters (such as molecular sieves) to become saturated with moisture and fail prematurely, affecting the overall system's filtration lifespan and the final gas dryness. Therefore, efficiently and energy-savingly removing moisture from compressed air is crucial for improving the performance of the entire filtration system. Utility Model Content

[0004] The purpose of this invention is to provide an air respirator ram gas filtration system, which aims to solve the problem that the low efficiency of secondary dehumidification in existing filtration systems limits the overall performance and lifespan of the system.

[0005] To achieve the above objectives, this utility model provides the following technical solution: An air respirator ram gas filtration system includes a primary filter cartridge 2, a secondary filter cartridge 7, and a tertiary filter cartridge assembly 11 connected in series. The primary filter cartridge 2 is a wet filter; the tertiary filter cartridge assembly 11 is an adsorption filter, with a filter element 10.3 for adsorption filtration inside the tertiary filter cartridge 10. The secondary filter cartridge 7 includes an outer cylinder 7.5 and an inner cylinder 7.8 disposed therein, with filter media 7.9 for adsorption filtration inside the inner cylinder 7.8. A condenser pipe 7.6 is provided between the body 7.5 and the inner cylinder 7.8. A throttling orifice 7.2 is provided behind the inlet end of the condenser pipe 7.6. The clean gas flowing out of the three-stage filter cartridge group 11 enters the condenser pipe 7.6 through the return pipe 13 and is throttled and cooled through the throttling orifice 7.2. The system also includes a return pipe 13, which connects the gas outlet end of the three-stage filter cartridge group 11 to the inlet end of the condenser pipe 7.6 in the second-stage filter cartridge 7.

[0006] The secondary filter cartridge 7 has an expansion chamber 7.4 located behind the throttling orifice 7.2 on the condenser pipe 7.6. The outer cylinder 7.5 of the secondary filter cartridge 7 has an air inlet 7.3, the position of which corresponds to the position of the expansion chamber 7.4.

[0007] Preferably, the three-stage filter cartridge assembly 11 includes at least two three-stage filter cartridges 10 connected in parallel.

[0008] In this invention, the primary filter cartridge 2 is connected to the air inlet 7.3 of the secondary filter cartridge 7 via the first connecting pipe 6; the secondary filter cartridge 7 is connected to the air inlet of the tertiary filter cartridge group 11 via the second connecting pipe 9.

[0009] The bottom of the primary filter cartridge 2, the secondary filter cartridge 7, and the tertiary filter cartridge 10 is equipped with a corresponding primary drain valve 5, a secondary drain valve 8, and a tertiary drain valve 12, respectively. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structural principle of this utility model; Figure 2 This is a schematic diagram of the internal structure of the secondary filter cartridge; Figure 3 yes Figure 2 A magnified view of part A in the middle; Figure 4 This is a schematic diagram of the inner cylinder of the secondary filter cartridge; Figure 5 This is a schematic diagram of the internal structure of a three-stage filter cartridge.

[0011] In the diagram: 1. Inlet pipe; 2. Primary filter cartridge; 3. Water injection valve; 4. Horizontal valve; 5. Primary drain valve; 6. First connecting pipe; 7. Secondary filter cartridge; 8. Secondary drain valve; 9. Secondary connecting pipe; 10. Tertiary filter cartridge; 11. Tertiary filter cartridge assembly; 12. Tertiary drain valve; 13. Return pipe; 14. Outlet pipe; 7.1 Top cap; 7.2 Throttling orifice; 7.3 Air inlet; 7.4 Expansion chamber; 7.5 Outer cylinder; 7.6 Condensation piping; 7.7 Bottom cap; 7.8 Inner cylinder; 7.9 Filter media; 10.1 Outer shell; 10.2 Filter cartridge; 10.3 Filter cartridge; 10.4 Bottom cover. Detailed Implementation

[0012] The present invention will be further described below with reference to specific embodiments.

[0013] The description of this utility model is merely a structural or even functional description of the embodiments, and the scope of this utility model is not limited by the embodiments described herein.

[0014] like Figures 1-5 As shown, this embodiment is achieved through the following technical solution: This utility model discloses an air respirator ram gas filtration system. The system includes, in sequence along the gas flow direction, a primary filter cartridge 2, a secondary filter cartridge 7, and a tertiary filter cartridge group 11, which are connected in series through corresponding pipelines.

[0015] The primary filter cartridge 2 is a wet filter used for preliminary gas cleaning. It is connected to the gas source through the air inlet pipe 1. The cartridge body is equipped with a water injection valve 3 for adding filter liquid and a level valve 4 for determining the liquid level. The bottom is equipped with a primary drain valve 5 for discharging waste liquid.

[0016] The secondary filter cartridge 7 mainly comprises an outer cylinder 7.5, whose top and bottom ends are sealed by removable upper end caps 7.1 and lower end caps 7.7, respectively. A secondary drain valve 8 is provided on the lower end cap 7.7. Inside the outer cylinder 7.5, an inner cylinder 7.8 is coaxially arranged, filled with filter media 7.9 for adsorption and filtration. A condensation pipe 7.6 is provided between the outer cylinder 7.5 and the inner cylinder 7.8, and this pipe is equipped with a throttling orifice 7.2 and an expansion chamber 7.4.

[0017] The three-stage filter cartridge assembly 11 is used for deep adsorption filtration. In this embodiment, two sets are connected in parallel to increase the filtration area. Each three-stage filter cartridge 10 is equipped with a three-stage drain valve 12 at its bottom. Its structure mainly includes an outer shell 10.1, the bottom of which is sealed by a removable bottom cover 10.4. A filter cartridge 10.2 is disposed inside the outer shell 10.1, which contains the core adsorption filter element 10.3.

[0018] In this system, the outlet of the primary filter cartridge 2 is connected to the inlet 7.3 of the secondary filter cartridge 7 via the first connecting pipe 6; the outlet of the secondary filter cartridge 7 is connected to the tertiary filter cartridge group 11 via the second connecting pipe 9; and the total outlet of the tertiary filter cartridge group 11 is connected to the return pipe 13, which is connected to the inlet of the condenser pipe 7.6 in the secondary filter cartridge 7.

[0019] The system's workflow is as follows: Primary filtration: High-pressure humid gas containing impurities enters the primary filter cartridge 2 from the inlet pipe 1. When passing through the filtrate, most of the large particles of impurities such as oil and dust are washed away.

[0020] Level 2 high-efficiency dehumidification: a. Refrigeration: Simultaneously, the high-pressure, clean, and dry gas from the end-of-system three-stage filter cartridge group 11 enters the condenser pipe 7.6 of the second-stage filter cartridge 7 through the return pipe 13. This gas is throttled when passing through the throttling orifice 7.2, causing a sudden drop in pressure. It then expands in the expansion chamber 7.4, and its temperature decreases due to the Joule-Thomson effect, forming a low-temperature condensation surface on the outer wall of the expansion chamber 7.4 and the condenser pipe 7.6.

[0021] b. Dehumidification: Gas carrying a large amount of water vapor exiting the primary filter cartridge 2 enters the air inlet 7.3 of the secondary filter cartridge 7 through the first connecting pipe 6, directly impacting the outer wall of the low-temperature expansion chamber 7.4. The water vapor in the airflow rapidly condenses into liquid water upon encountering the cold air, and falls along the pipe and cartridge walls, collecting at the bottom of the cartridge and being discharged through the secondary drain valve 8. The deeply dehumidified gas then undergoes preliminary adsorption through the filter media 7.9 inside the inner cartridge 7.8 before flowing out from the air outlet of the secondary filter cartridge 7.

[0022] Three-stage deep purification: The dried gas enters the three-stage filter cartridge group 11 through the second connecting pipe 9. When the gas flows through the filter element 10.3 inside the three-stage filter cartridge 10, such as activated carbon, molecular sieve, etc., residual trace amounts of oil, odors and other gaseous pollutants are completely adsorbed.

[0023] Finally, highly pure, dry high-pressure gas is output from the outlet pipe 14.

[0024] Of course, the above description is only a preferred embodiment of this utility model and should not be considered as limiting the scope of the embodiments of this utility model. This utility model is not limited to the above examples, and all equivalent changes and improvements made by those skilled in the art within the scope of this utility model should be included in the patent coverage of this utility model.

Claims

1. An air respirator purging gas filtration system, characterized in that, It includes a primary filter cartridge (2), a secondary filter cartridge (7), and a tertiary filter cartridge group (11) connected together. Among them, the first-stage filter cartridge (2) is a wet filter; the third-stage filter cartridge group (11) is an adsorption filter, and the third-stage filter cartridge (10) is equipped with a filter element (10.3) for adsorption filtration. The secondary filter cartridge (7) includes an outer cylinder (7.5) and an inner cylinder (7.8) disposed therein. The inner cylinder (7.8) is provided with filter media (7.9) for adsorption filtration. A condenser pipe (7.6) is provided between the outer cylinder (7.5) and the inner cylinder (7.8). A throttling hole (7.2) is provided behind the inlet end of the condenser pipe (7.6). The system also includes a return pipe (13) that connects the outlet of the three-stage filter cartridge group (11) to the inlet of the condenser pipe (7.6) in the second-stage filter cartridge (7).

2. The air respirator ram gas filtration system according to claim 1, characterized in that, An expansion chamber (7.4) is provided on the condenser pipe (7.6) of the secondary filter cartridge (7) behind the throttling orifice (7.2); an air inlet (7.3) is provided on the outer cylinder (7.5) of the secondary filter cartridge (7), and the position of the air inlet (7.3) corresponds to the position of the expansion chamber (7.4).

3. The air respirator ram gas filtration system according to claim 1, characterized in that, The three-stage filter cartridge assembly (11) includes at least two three-stage filter cartridges (10) connected in parallel.

4. The air respirator ram gas filtration system according to claim 1, characterized in that, The primary filter cartridge (2) is connected to the air inlet (7.3) of the secondary filter cartridge (7) via the first connecting pipe (6); the secondary filter cartridge (7) is connected to the air inlet of the tertiary filter cartridge group (11) via the second connecting pipe (9).

5. The air respirator ram gas filtration system according to claim 1, characterized in that, The bottom of the primary filter cartridge (2), the secondary filter cartridge (7) and the tertiary filter cartridge (10) are provided with their respective primary drain valve (5), secondary drain valve (8) and tertiary drain valve (12).

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