One-way high-pressure flow limiting device for positive-pressure oxygen respirator
By designing a one-way high-pressure flow limiting device for positive pressure oxygen respirators, and adopting a combined structure of flow limiting valve body, gas channel, ventilation seat and sealing ring, the problem of unstable flow and blockage of oxygen respirator flow limiting devices is solved, thereby improving safety and ensuring the safety of personnel.
Patent Information
- Application Number
- CN202520337355.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-28
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-02-28
AI Technical Summary
Existing oxygen respirator flow limiting devices suffer from problems such as excessive leakage flow, unstable performance, and easy clogging, resulting in unstable safety and threatening the safety of workers.
A one-way high-pressure flow limiting device for positive pressure oxygen respirators was designed. It adopts a combination structure of flow limiting valve body, gas channel, cavity, ventilation seat, flow limiting rod and sealing ring. The sealing ring filters impurities, balances the pre-pressure and boost pressure of the plane, and ensures stable oxygen flow control and is not easy to block.
It achieves effective control of oxygen flow, has stable performance, reduces blockage, improves the safety factor of the respirator, and ensures the safety of workers in toxic and harmful gas environments.
Smart Images
Figure CN223944799U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a respirator technical field, concretely relates to a one-way high pressure flow limiting device for positive pressure oxygen respirator. BACKGROUND
[0002] The oxygen respirator is also called isolated compressed oxygen respirator, the breathing system is isolated from the outside world, the instrument and the human body breathing system form internal circulation, oxygen is provided by the high-pressure gas cylinder, and the gas bag stores the gas during breathing, is a breathing protection product produced for decades, is widely applicable to petroleum, chemical industry, metallurgy, coal, mine, laboratory and other industries, and is worn by specially trained personnel in a toxic and harmful gas environment for rescue, accident handling, first aid or operation.
[0003] The chest-hung pressure gauge connected with the respirator is a display device for monitoring the pressure of the oxygen cylinder of the respirator at any time, however, the complex and changeable working environment and large amount of work may cause damage or breakage of the exposed chest-hung pressure gauge and the connecting hose, resulting in a large amount of oxygen leakage, and the flow limiting device connected with the cylinder and the chest gauge hose becomes an important protective barrier.
[0004] The existing flow limiting device has the problems of large external leakage flow, unstable performance, easy clogging and the like, and most of the safety devices of other types of respirators adopt the form of switch, which may cause the safety factor of the oxygen respirator to be unstable, thereby threatening the safety of the workers. UTILITY MODEL CONTENTS
[0005] In view of the above problems, the utility model provides a one-way high pressure flow limiting device for positive pressure oxygen respirator, which can effectively control the flow of oxygen, is stable in performance, is not prone to clogging, improves the safety factor of the respirator in use, and ensures the safety of the workers in a toxic and harmful gas environment.
[0006] To achieve the above object, the technical scheme of the utility model is as follows: a one-way high pressure flow limiting device for positive pressure oxygen respirator, comprising a flow limiting valve body, a gas passage and a cavity are arranged in the flow limiting valve body, the gas passage and the cavity are communicated, a vent seat is arranged at the top of the cavity, a through hole is arranged in the center of the vent seat, the through hole is communicated with the gas passage in the flow limiting valve body, a cross-shaped flow limiting rod is arranged below the vent seat, the top end of the flow limiting rod extends into the through hole, the bottom end of the flow limiting rod is connected with a flow limiting plug, a first annular groove is arranged at the bottom end of the vent seat, a first sealing ring is arranged in the first annular groove, the bottom of the first sealing ring is connected with the flow limiting rod, a second annular groove is arranged on the longitudinal surface of the flow limiting plug, a second sealing ring is arranged in the second annular groove, and the second sealing ring is connected with the inner wall of the cavity.
[0007] As a further scheme of the utility model: the through hole includes first through hole and second through hole, the first through hole and second through hole are arranged in ladder type, the first through hole is communicated with the gas passage, the second through hole is inserted with the flow limiting rod.
[0008] As a still further scheme of the utility model: the flow limiting rod includes first rod body and second rod body, the first rod body and second rod body are connected perpendicularly, the flow limiting screw plug is internally provided with a channel, the top of the first rod body is inserted with the second through hole, the bottom is inserted with the flow limiting screw plug through the channel, the top of the second rod body is in contact with the first sealing ring, and the bottom is in contact with the top of the flow limiting screw plug.
[0009] As a still further scheme of the utility model: the first sealing ring and the second sealing ring are both 0 type.
[0010] As a still further scheme of the utility model: the bottom of the flow limiting valve body is connected with the chest table hose.
[0011] Compared with the prior art, the utility model has the advantages that:
[0012] 1, the utility model discloses a second annular groove is set up on the flow limiting screw plug, and the second sealing ring is arranged in the second annular groove, so that the impurities or dust in the gas is filtered in the second annular groove during use, and the damage to the annular flow limiting surface is reduced.
[0013] 2, the utility model discloses a first sealing ring is arranged at the end of the breather base, which plays the role of balanced plane pre-pressing and pressure boosting for the flow limiting rod, and plays the protection function for the device.
[0014] 3, the utility model discloses a flow limiting device can not only effectively control the flow of oxygen, and the performance is stable, and the phenomenon of easy to block is not easy to occur, improves the safety factor of the respirator use, and ensures the safety of the staff in the toxic and harmful gas environment. ACCURACY OF DRAWINGS
[0015] Fig. 1 It is the whole structure schematic diagram of the utility model for one-way high pressure flow limiting device of positive pressure oxygen respirator;
[0016] Fig. 2 It is the explosion structure schematic diagram of the utility model for one-way high pressure flow limiting device of positive pressure oxygen respirator;
[0017] In the drawing: 1, flow limiting valve body;2, gas passage;3, cavity;4, breather base;5, through hole;6, flow limiting rod;7, flow limiting screw plug;8, first annular groove;9, first sealing ring;10, second annular groove;11, second sealing ring;12, first through hole;13, second through hole;14, first rod body;15, second rod body;16, channel DETAILED DESCRIPTION
[0018] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.
[0019] Reference Figs. 1-2 A one-way high-pressure flow limiting device for a positive pressure oxygen respirator, comprising a flow limiting valve body 1, a gas passage 2 and a cavity 3 are arranged in the flow limiting valve body 1, the gas passage 2 and the cavity 3 are communicated, a vent seat 4 is arranged at the top of the cavity 3, a through hole 5 is arranged in the center of the vent seat 4, the through hole 5 is communicated with the gas passage 2 in the flow limiting valve body 1, a cross-shaped flow limiting rod 6 is arranged below the vent seat 4, the top end of the flow limiting rod 6 extends into the through hole 5, the bottom end of the flow limiting rod 6 is inserted into a flow limiting plug 7, a first annular groove 8 is arranged at the bottom end of the vent seat 4, a first sealing ring 9 is arranged in the first annular groove 8, the bottom of the first sealing ring 9 is in contact with the flow limiting rod 6, a second annular groove 10 is arranged on the longitudinal surface of the flow limiting plug 7, a second sealing ring 11 is arranged in the second annular groove 10, and the second sealing ring 11 is in contact with the inner wall of the cavity 3.
[0020] The through hole 5 comprises a first through hole 12 and a second through hole 13, the first through hole 12 and the second through hole 13 are arranged in a stepped manner, the first through hole 12 is communicated with the gas passage 2, and the flow limiting rod 6 is inserted into the second through hole 13.
[0021] The flow limiting rod 6 comprises a first rod body 14 and a second rod body 15, the first rod body 14 and the second rod body 15 are vertically connected, a passage 16 is arranged in the flow limiting plug 7, the top end of the first rod body 14 is inserted into the second through hole 13, the bottom end is inserted into the flow limiting plug 7 through the passage 16, the top of the second rod body 15 is in contact with the first sealing ring 9, and the bottom is in contact with the top of the flow limiting plug 7.
[0022] The first sealing ring 9 and the second sealing ring 11 are both 0-shaped.
[0023] The bottom end of the flow limiting valve body 1 is connected with a chest surface hose.
[0024] In use, high pressure oxygen enters from the gas passage 2 of the flow limiting device, passes through the first through hole 12 of the vent seat 4, and flows out from the through hole 5 of the vent seat 4, at which time the first sealing ring 9 is tightly attached to the flow limiting rod 6, the flow limiting plug 7 is tightly pressed against the flow limiting rod 6, the first sealing ring 9 is axially blocked at both ends, the first sealing ring 9 is deformed in the neck direction under the action of high pressure oxygen, the flow limiting rod 6 is tightly attached to the flow limiting plug 7, oxygen passes into the chest table hose from the gap between the flow limiting rod 6 and the flow limiting plug 7, in this process, impurities or dust in the gas are filtered by the second sealing ring 11 in the second annular groove 10, reducing the damage of impurities or dust to the annular flow limiting surface, and the chest table pressure slowly rises, when the chest table or hose is disconnected, the oxygen flowing from the annular contact surface between the flow limiting rod 6 and the flow limiting plug 7 gradually decreases or is closed under the action of the pressing force of the first sealing ring 9 and the pressure difference between the inside and outside of the flow limiting rod 6; when used without failure, the cylinder oxygen is gradually consumed, and the pressure decreases, due to the pressure difference between the two ends of the flow limiting device, at this time the chest table oxygen is greater than the inlet pressure, backflow is formed, and the flow limiting rod 6 moves upward, so that a gap is formed between the flow limiting rod 6 and the flow limiting plug 7, the flow limiting effect is not formed, and the chest table pressure display value is consistent with the cylinder pressure display value.
[0025] Although the embodiments of the present application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.
Claims
1. A one-way high-pressure flow limiting device for a positive pressure oxygen breathing apparatus, comprising a flow limiting valve body (1), a gas passage (2) and a cavity (3) are arranged inside the flow limiting valve body (1), the gas passage (2) and the cavity (3) are communicated, characterized in that: The top of the cavity (3) is provided with a vent seat (4), the center of the vent seat (4) is provided with a through hole (5), the through hole (5) is communicated with the gas passage (2) inside the flow limiting valve body (1), the lower part of the vent seat (4) is provided with a cross-shaped flow limiting rod (6), the top end of the flow limiting rod (6) extends into the through hole (5), the bottom end of the flow limiting rod (6) is inserted into the flow limiting screw plug (7), the bottom end of the vent seat (4) is provided with a first annular groove (8), the first annular groove (8) is provided with a first sealing ring (9), the bottom of the first sealing ring (9) is in contact with the flow limiting rod (6), the longitudinal surface of the flow limiting screw plug (7) is provided with a second annular groove (10), the second annular groove (10) is provided with a second sealing ring (11), and the second sealing ring (11) is in contact with the inner wall of the cavity (3).
2. The one-way high pressure flow restricting device for a positive pressure oxygen breathing apparatus of claim 1, wherein: The through hole (5) comprises a first through hole (12) and a second through hole (13), the first through hole (12) and the second through hole (13) are arranged in a stepped manner, the first through hole (12) is communicated with the gas passage (2), and the second through hole (13) is inserted into the flow limiting rod (6).
3. The one-way high pressure flow restricting device for a positive pressure oxygen breathing apparatus of claim 2, wherein: The flow limiting rod (6) comprises a first rod body (14) and a second rod body (15), the first rod body (14) and the second rod body (15) are vertically connected, the flow limiting screw plug (7) is internally provided with a passage (16), the top end of the first rod body (14) is inserted into the second through hole (13), the bottom end is inserted into the flow limiting screw plug (7) through the passage (16), the top of the second rod body (15) is in contact with the first sealing ring (9), and the bottom is in contact with the top of the flow limiting screw plug (7).
4. The one-way high pressure flow restricting device for a positive pressure oxygen breathing apparatus of claim 3, wherein: The first sealing ring (9) and the second sealing ring (11) are both 0-shaped.
5. The one-way high pressure flow restricting device for a positive pressure oxygen breathing apparatus of claim 4, wherein: The bottom end of the flow limiting valve body (1) is connected with a chest surface hose.