Adjustable quantitative flow device for positive pressure oxygen respirator

Abstract

The utility model relates to the technical field of rescue equipment, in particular to an adjustable quantitative flow device for a positive pressure oxygen respirator, which comprises a quantitative valve body, a cavity is radially arranged on the inner side of the quantitative valve body, a quantitative valve rod is arranged in the cavity, a bump is arranged in the middle of the quantitative valve rod, and a boss is arranged on the lower portion of the cavity. A first spring is arranged between the protruding block and the boss and arranged on a proportional valve rod in a sleeving mode, a proportional valve plug is further connected into the cavity through threads, a proportional valve is arranged at the bottom of the proportional valve plug, the top of the proportional valve rod sequentially penetrates through the proportional valve and the proportional valve plug, a piston is arranged above the proportional valve plug, and the piston is in contact connection with the interior of the cavity. The piston is connected with a second spring, the top end of the second spring is connected with an adjusting nut, and one side of the proportional valve body is further detachably connected with a connecting nozzle. According to the oxygen supply device, the gas flow can be adjusted according to actual requirements, the phenomenon that the device is blocked by gas impurities is avoided, and stable oxygen supply is provided for the oxygen respirator.

Description

Technical Field

[0001] This utility model relates to the field of rescue equipment technology, specifically to an adjustable quantitative flow device for a positive pressure oxygen respirator. Background Technology

[0002] A publicly known positive-pressure oxygen respirator used for mine rescue, firefighting, and chemical protection is a closed-loop breathing system that isolates the user from the outside environment. It is protective equipment worn by people working or providing rescue in environments with toxic or harmful gases. Because it is isolated from the outside environment, the entire breathing system is a closed loop. During use, the CO2 exhaled by the human body reacts chemically with Ca(OH)2 in the purification canister and is then removed. Since the human body requires more than 21% oxygen to meet its physiological needs, an oxygen supply system must be included in the oxygen respirator.

[0003] Since oxygen respirators are used in high-risk situations, excessively high or low oxygen supply can cause discomfort and harm to the human body. Stable and appropriate oxygen supply is an important indicator of oxygen respirators. Currently, the flow device of the chamber-type oxygen respirator is prone to unstable flow or blockage due to impurities in the oxygen during long-term use. Utility Model Content

[0004] To address the aforementioned problems, this invention provides an adjustable quantitative flow device for positive pressure oxygen respirators. This device not only allows for adjustment of gas flow according to actual needs but also avoids clogging caused by gas impurities, thus providing a stable oxygen supply for the oxygen respirator.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: an adjustable metering flow device for a positive pressure oxygen respirator, comprising a metering valve body, a cavity radially formed on the inner side of the metering valve body, a metering valve stem disposed within the cavity, a protrusion in the middle of the metering valve stem, a boss at the lower part of the cavity, a first spring disposed between the protrusion and the boss, the first spring being sleeved on the metering valve stem, a metering valve plug threadedly connected within the cavity, a metering valve valve bottom disposed at the bottom of the metering valve plug, the top of the metering valve stem passing sequentially through the metering valve and the metering valve plug, a piston disposed above the metering valve plug, the piston contacting the interior of the cavity, a second spring connected to the piston, an adjusting nut connected to the top of the second spring, the adjusting nut being threadedly connected to the top of the metering valve body, and a nozzle detachably connected to one side of the metering valve body, the metering valve being connected to the nozzle via a gas passage.

[0006] As a further embodiment of this utility model: a first sealing ring is provided between the metering valve stem and the metering valve, a first annular groove is provided inside the metering valve body, the first sealing ring is placed in the first annular groove, and a second sealing ring is provided between the metering valve body and the connector.

[0007] As a further embodiment of this utility model: a second annular groove is provided on the outside of the piston, a third sealing ring is provided in the second annular groove, a through hole is provided on the top of the piston, and the second spring extends into the through hole.

[0008] As a further embodiment of this utility model: a spring seat is fixedly connected inside the adjusting nut, and the top end of the second spring is connected to the spring seat.

[0009] As a further embodiment of this utility model: the upper and lower parts of the outer side of the metering valve body are provided with external threads, the adjusting nut is screwed onto the top of the metering valve body through the external threads, and a locking nut is also screwed onto the upper part of the outer side of the metering valve body.

[0010] As a further improvement of this utility model, the bottom end of the metering valve body is connected to the pressure reducer.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] 1. This utility model adopts a secondary pressure reduction method. By adjusting the adjusting nut to the set value, the gas flow rate is regulated and kept constant.

[0013] 2. This utility model, through its detachable connector, avoids the blockage of the connector due to gas impurities during long-term use, providing a continuous and stable oxygen supply for the oxygen respirator, and is easy to maintain, making maintenance and routine inspections by the rescue team faster and more convenient. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the adjustable quantitative flow device for a positive pressure oxygen respirator in this utility model;

[0015] Figure 2 This is an exploded view of the overall structure of the adjustable quantitative flow device for a positive pressure oxygen respirator in this utility model;

[0016] In the diagram: 1. Metering valve body; 2. Cavity; 3. Metering valve stem; 4. Protrusion; 5. Boss; 6. First spring; 7. Metering valve plug; 8. Metering valve; 9. Piston; 10. Second spring; 11. Adjusting nut; 12. Connector; 13. Gas passage; 14. First sealing ring; 15. First annular groove; 16. Second sealing ring; 17. Second annular groove; 18. Third sealing ring; 19. Through hole; 20. Spring seat; 21. External thread; 22. Locking nut Detailed Implementation

[0017] 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.

[0018] refer to Figures 1 to 2 An adjustable metering flow device for a positive pressure oxygen respirator includes a metering valve body 1. A cavity 2 is radially formed on the inner side of the metering valve body 1. A metering valve stem 3 is disposed within the cavity 2. A protrusion 4 is located in the middle of the metering valve stem 3. A boss 5 is located at the lower part of the cavity 2. A first spring 6 is disposed between the protrusion 4 and the boss 5. The first spring 6 is sleeved on the metering valve stem 3. A metering valve plug 7 is also threadedly connected within the cavity 2. A metering valve 8 is located at the bottom of the metering valve plug 7. The top of the metering valve stem 3 passes sequentially through the metering valve 8 and the metering valve plug 7. A piston 9 is located above the metering valve plug 7. The piston 9 is in contact with the interior of the cavity 2. A second spring 13 is connected to the piston 9. An adjusting nut 14 is connected to the top of the second spring 13. The adjusting nut 14 is threadedly connected to the top of the metering valve body 1. A nozzle 15 is detachably connected to one side of the metering valve body 1. The metering valve 8 is connected to the nozzle 15 through a gas passage 16.

[0019] A first sealing ring 17 is provided between the metering valve stem 3 and the metering valve 8. A first annular groove 18 is provided inside the metering valve body 1. The first sealing ring 17 is placed in the first annular groove 18. A second sealing ring 19 is provided between the metering valve body 1 and the connector 15.

[0020] The piston 9 has a second annular groove 20 on its outside, and a third sealing ring 21 is provided in the second annular groove 20. The piston 9 has a through hole 22 on its top, and the second spring 13 extends into the through hole 22.

[0021] The adjusting nut 14 has a spring seat 23 fixedly connected inside, and the top of the second spring 13 is connected to the spring seat 23.

[0022] External threads 24 are provided on the upper and lower parts of the outer side of the metering valve body 1. The adjusting nut 14 is screwed onto the top of the metering valve body 1 through the external threads 24. A locking nut 25 is also screwed onto the upper part of the outer side of the metering valve body 1.

[0023] The bottom of the metering valve body 1 is connected to the pressure reducer.

[0024] Working principle: During operation, high-pressure oxygen is first reduced in pressure by a pressure reducer to form medium-pressure gas. The medium-pressure gas enters the metering valve body 1. Rotating the adjusting nut 11 causes the second spring 10 and piston 9 to move downward, pushing the metering valve rod 3 downward. This causes the protrusion 4 on the metering valve rod 3 to move away from the metering valve 8, creating a certain gap between the metering valve rod 3 and the metering valve 8. At this time, the gas enters the metering valve 8 and is output from the nozzle 12 through the gas channel 13. The flow rate can be adjusted according to the output demand.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An adjustable metering flow device for a positive pressure oxygen respirator, comprising a metering valve body (1), wherein a cavity (2) is radially formed on the inner side of the metering valve body (1), characterized in that: The cavity (2) is provided with a metering valve stem (3), the metering valve stem (3) has a protrusion (4) in the middle, and a boss (5) is provided at the bottom of the cavity (2). A first spring (6) is provided between the protrusion (4) and the boss (5). The first spring (6) is sleeved on the metering valve stem (3). A metering valve plug (7) is also connected to the cavity (2) by a thread. A metering valve (8) is provided at the bottom of the metering valve plug (7). The top of the metering valve stem (3) passes through the metering valve (8) and the metering valve in sequence. A valve plug (7) is provided above the metering valve plug (7). The piston (9) is in contact with the inside of the cavity (2). A second spring (13) is connected to the piston (9). An adjusting nut (14) is connected to the top of the second spring (13). The adjusting nut (14) is threaded to the top of the metering valve body (1). A nozzle (15) can also be detachably connected to one side of the metering valve body (1). The metering valve (8) is connected to the nozzle (15) through a gas passage (16).

2. The adjustable metering flow device for a positive pressure oxygen respirator according to claim 1, characterized in that: A first sealing ring (17) is provided between the metering valve stem (3) and the metering valve (8). A first annular groove (18) is provided inside the metering valve body (1). The first sealing ring (17) is placed in the first annular groove (18). A second sealing ring (19) is provided between the metering valve body (1) and the connector (15).

3. The adjustable metering flow device for a positive pressure oxygen respirator according to claim 2, characterized in that: The piston (9) has a second annular groove (20) on its outside, and a third sealing ring (21) is provided in the second annular groove (20). The piston (9) has a through hole (22) on its top, and the second spring (13) extends into the through hole (22).

4. The adjustable metering flow device for a positive pressure oxygen respirator according to claim 1, characterized in that: The adjusting nut (14) is internally fixedly connected to a spring seat (23), and the top end of the second spring (13) is connected to the spring seat (23).

5. The adjustable metering flow device for a positive pressure oxygen respirator according to claim 2, characterized in that: The upper and lower parts of the outer side of the metering valve body (1) are provided with external threads (24). The adjusting nut (14) is screwed onto the top of the metering valve body (1) through the external threads (24). A locking nut (25) is also screwed onto the upper part of the outer side of the metering valve body (1).

6. The adjustable metering flow device for a positive pressure oxygen respirator according to claim 1, characterized in that: The bottom end of the metering valve body (1) is connected to the pressure reducer.

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