A pressure relief device for a protective breathing apparatus

Abstract

The utility model belongs to the technical field of emergency oxygen supply, disclose a kind of pressure relief device for protective breathing apparatus, comprising: pressure relief valve-main body, pressure relief valve-outer cover, pressure relief valve-movable valve, pressure relief valve-soft rubber valve, spring, pull rope;Pressure relief valve-movable valve is installed in pressure relief valve-outer cover and pressure relief valve-main body through spring;Pressure relief valve-soft rubber valve is adhered on pressure relief valve-movable valve by adhesive;Pull rope one side is installed in protective head cover inner side of protective breathing apparatus, and pull rope end is fixedly connected on the inner wall of protective head cover.The utility model proposes a kind of pressure relief mechanism with small volume, low trigger pressure and simple structure, meets the development demand of portable protective breathing apparatus.

Description

Technical Field

[0001] This utility model belongs to the field of emergency oxygen supply technology, and in particular relates to a pressure relief device for protective breathing equipment. Background Technology

[0002] Most pressure relief valves used in current civil aircraft are one-way positive pressure valves. These valves open to release pressure by sensing changes in pressure. However, because the pressure-sensing diaphragm area of ​​one-way positive pressure valves is relatively small, they typically cannot operate stably under low pressure differentials. The characteristic of the above structure is that the valve is opened by sensing the pressure difference through a diaphragm. The newly developed protective breathing equipment needs to maintain an internal positive pressure of 150Pa~250Pa, which is difficult to meet with a one-way positive pressure valve. Utility Model Content

[0003] This utility model provides a pressure relief device for protective breathing equipment, which is an independent closed-loop respirator to meet the requirements for internal pressure regulation of the product's hood.

[0004] The technical solution of this utility model: A pressure relief device for protective breathing equipment, the device comprising: Pressure relief valve - main body 1, pressure relief valve - outer cover 2, pressure relief valve - movable valve 3, pressure relief valve - soft rubber valve 4, spring 5, pull rope 6; The pressure relief valve - movable valve 3 is installed inside the pressure relief valve - outer cover 2 and pressure relief valve - body 1 through the spring 5; the pressure relief valve - soft rubber valve 4 is glued to the pressure relief valve - movable valve 3 with adhesive. One side of the pull rope 6 is installed inside the protective headgear of the protective breathing equipment, and the end of the pull rope 6 is fixedly connected to the inner wall of the protective headgear.

[0005] Furthermore, the pressure relief valve - movable valve 3 passes through the hole on the pressure relief valve - outer cover 2, and the two slide relative to each other.

[0006] Furthermore, under normal conditions, the pressure relief valve - movable valve 3 is pressed onto the pressure relief valve - body 1 by the spring 5 fixed at the other end to the pressure relief valve - outer cover 2, and the pressure relief valve - body 1 and the pressure relief valve - soft rubber valve 4 form a seal.

[0007] Furthermore, the soft rubber valve 4 of the pressure relief mechanism is installed on the outside of the protective headgear of the protective breathing equipment, and is subject to external atmospheric or cabin pressure; Furthermore, the pressure relief valve - outer cover 2 is machined with vent holes.

[0008] Furthermore, when the pull rope actuates the pressure relief valve - movable valve 3 to compress the spring, the pressure relief valve - soft rubber valve 4 disengages from the pressure relief valve - main body 1.

[0009] Furthermore, after the pressure relief valve-body 1 and the pressure relief valve-soft rubber valve 4 lose their seal, the gas is discharged through the hole on the pressure relief valve-outer cover 2 and the pressure relief valve-soft rubber valve 4 through the gap opened between the pressure relief valve-body 1.

[0010] Furthermore, after the pressure inside the protective hood decreases to a preset value, the pressure relief valve 1 closes, ultimately controlling the pressure inside the protective hood within a certain pressure range.

[0011] This invention presents a pressure relief device for protective breathing equipment, which converts pressure into tension and can operate under low pressure differentials. The safety valve located at the rear of the hood prevents excessive pressure buildup inside the hood and provides emergency pressure relief in the event of a sudden drop in cabin pressure, thus meeting the development needs of protective breathing equipment. Attached Figure Description

[0012] Figure 1 A schematic diagram of a pressure relief device for protective breathing equipment. Figure 1 ; Figure 2 A schematic diagram of a pressure relief device for protective breathing equipment. Figure 2 . Detailed Implementation

[0013] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings.

[0014] This utility model provides a pressure relief mechanism for protective breathing equipment. By sensing the change in pressure inside the protective breathing equipment hood, the deformation of the hood drives the pull cord, thereby pulling the pressure relief valve to open and release the pressure inside the hood. After the pressure is reduced to a certain level, the pressure relief valve closes, ultimately controlling the pressure inside the hood within a certain pressure range to prevent overpressure of the device caused by changes in cabin pressure, and to discharge excess oxygen.

[0015] This utility model provides a pressure relief mechanism for protective breathing equipment, see reference. Figure 1 and Figure 2 It includes: pressure relief valve - main body 1, pressure relief valve - outer cover 2, pressure relief valve - movable valve 3, pressure relief valve - soft rubber valve 4, spring 5, pull rope 6.

[0016] The pressure relief mechanism's soft rubber valve 4 is installed on the outside of the protective headgear of the respirator, subject to external atmospheric or cabin pressure. The pull rope 6 is installed on the inside of the protective headgear, with its end fixed to the inner wall of the headgear. The pressure relief valve-moving valve 3 passes through a hole on the pressure relief valve-outer cover 2, allowing relative sliding between them; the pressure relief valve-outer cover 2 has vent holes. Under normal conditions, the pressure relief valve-moving valve 3 is pressed against the pressure relief valve-body 1 by a spring 5 fixed to the pressure relief valve-outer cover 2, forming a seal between the pressure relief valve-body 1 and the pressure relief valve-soft rubber valve 4. When the pull rope pulls the pressure relief valve-moving valve 3, compressing the spring, the pressure relief valve-soft rubber valve 4 moves away from the pressure relief valve-body 1. The seal is broken, and internal gas escapes through the opening between the hole on the pressure relief valve-outer cover 2 and the gap where the pressure relief valve-soft rubber valve 4 leaves the pressure relief valve-body 1.

[0017] The working principle of this utility model is as follows: The pressure relief valve - soft rubber valve 4 is bonded to the pressure relief valve - movable valve 3 with adhesive, passes through the spring 5 and is installed inside the pressure relief valve - outer cover 2 and pressure relief valve - body 1. The entire pressure relief valve is fixed to the pressure relief valve buckle of the hood body. The end of the pull rope 6 is fixedly connected to the inner wall of the protective hood. The pressure relief valve - movable valve 3 is pressed onto the pressure relief valve - body 1 by the spring 5, which is fixed to the pressure relief valve - outer cover 2 at the other end. The pressure relief valve - body 1 and the pressure relief valve - soft rubber valve 4 form a seal, maintaining a certain positive pressure inside the hood, creating a sealed environment inside the hood, preventing external gases or smoke from entering the hood. When the pressure inside the protective breathing equipment hood exceeds the design range, the deformation of the hood drives the pull rope 6, thereby pulling the pressure relief valve - movable valve 3 and the pressure relief valve - soft rubber valve 4 away from the pressure relief valve - body 1. The pressure relief valve opens to release the pressure inside the hood. After the pressure is reduced to a certain level, the pressure relief valve closes, ultimately controlling the pressure inside the hood within a certain pressure range.

[0018] This utility model relates to emergency oxygen supply technology in portable oxygen equipment systems for civil aircraft, specifically a pressure relief mechanism for a protective breathing apparatus. It comprises: a pressure relief valve-body 1, a pressure relief valve-outer cover 2, a pressure relief valve-moving valve 3, a pressure relief valve-soft rubber valve 4, a spring 5, and a pull rope 6. It features the characteristic of converting pressure into tension and can operate under low pressure differentials. A safety valve located at the rear of the hood prevents excessive pressure buildup within the hood and provides emergency pressure relief in the event of a sudden drop in cabin pressure, meeting the development needs of protective breathing equipment. This utility model proposes a pressure relief mechanism that is small in size, has low trigger pressure, and a simple structure, satisfying the development requirements of portable protective breathing equipment.

Claims

1. A pressure relief device for a protective breathing apparatus, characterized in that, The device includes: Pressure relief valve - main body (1), pressure relief valve - outer cover (2), pressure relief valve - movable valve (3), pressure relief valve - soft rubber valve (4), spring (5), pull rope (6); The pressure relief valve - movable valve (3) passes through the spring (5) and is installed inside the pressure relief valve - outer cover (2) and the pressure relief valve - body (1); the pressure relief valve - soft rubber valve (4) is glued to the pressure relief valve - movable valve (3) by adhesive; One side of the pull rope (6) is installed inside the protective headgear of the protective breathing equipment, and the end of the pull rope (6) is fixedly connected to the inner wall of the protective headgear.

2. A pressure relief device for protective breathing equipment according to claim 1, characterized in that, The pressure relief valve - movable valve (3) passes through the hole on the pressure relief valve - outer cover (2) and slides relative to each other.

3. A pressure relief device for a protective breathing apparatus as defined in claim 1, characterized in that Under normal conditions, the pressure relief valve - movable valve (3) is pressed onto the pressure relief valve - body (1) by the spring (5) fixed at the other end of the pressure relief valve - outer cover (2), and the pressure relief valve - body (1) and the pressure relief valve - soft rubber valve (4) form a seal.

4. A pressure relief device for protective breathing equipment according to claim 1, characterized in that, The pressure relief mechanism soft rubber valve (4) is installed on one side of the protective headgear of the protective breathing equipment and is subject to external atmospheric or cabin pressure.

5. A pressure relief device for protective breathing equipment according to claim 1, characterized in that, The pressure relief valve has a vent hole machined on its outer cover (2).

6. A pressure relief device for a protective breathing apparatus as defined in claim 1, characterized in that When the pressure relief valve (3) is pulled by the rope and the spring is compressed, the pressure relief valve (4) leaves the pressure relief valve (1).

7. A pressure relief device for a protective breathing apparatus as defined in claim 6, characterized in that After the pressure relief valve-body (1) and the pressure relief valve-soft rubber valve (4) lose their seal, the gas is discharged through the hole on the pressure relief valve-outer cover (2) and the pressure relief valve-soft rubber valve (4) leaving the pressure relief valve-body (1) through the gap.

8. A pressure relief device for a protective breathing apparatus as defined in claim 7, characterized in that After the pressure inside the protective hood decreases to the preset value, the pressure relief valve-body (1) closes, ultimately controlling the pressure inside the protective hood within a certain pressure range.

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