Pressure relief device for protective breathing equipment

Abstract

The invention belongs to the technical field of emergency oxygen supply, and discloses a pressure relief device for protective breathing equipment, which comprises a pressure relief valve-main body, a pressure relief valve-outer cover, a pressure relief valve-movable valve, a pressure relief valve-soft rubber valve, a spring and a pull rope, the pressure release valve-movable valve penetrates through the spring and is arranged in the pressure release valve-outer cover and the pressure release valve-main body; the pressure release valve-flexible glue valve is adhered to the pressure release valve-movable valve through an adhesive; one side of the pull rope is installed on the inner side of a protective hood of the protective breathing equipment, and the tail end of the pull rope is fixedly connected to the inner wall of the protective hood. The pressure relief mechanism is small in size, low in trigger pressure and simple in structure, and the development requirement of portable protective breathing equipment is met.

Description

Technical Field

[0001] This invention 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. Summary of the Invention

[0003] The present invention provides a pressure relief device for protective breathing equipment, wherein the protective breathing equipment is an independent closed-loop recirculating breathing device to meet the requirements of internal pressure regulation of the product's headgear.

[0004] The technical solution of the present invention: 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] The present invention provides a pressure relief device for protective breathing equipment, which converts pressure into tension and can operate under low pressure differentials. A 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 the present invention will be described in detail below with reference to the accompanying drawings.

[0014] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0015] In the description of this invention, it should be understood that the terms "center", "axial", "vertical", "upper", "lower", "upper end", "bottom end", "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 invention 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 limiting the scope of protection of this invention.

[0016] This invention provides a pressure relief mechanism for protective breathing equipment. By sensing changes in the pressure inside the hood of the protective breathing equipment, the deformation of the hood causes a pull cord to open the pressure relief valve, releasing 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 range to prevent overpressure of the device caused by changes in cabin pressure, and to discharge excess oxygen.

[0017] This invention 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.

[0018] 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.

[0019] The working principle of this invention is as follows: The pressure relief valve - soft rubber valve 4 is bonded to the pressure relief valve - movable valve 3 by 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 on 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 and creating a sealed environment inside the hood, preventing external ambient gas 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 decreases to a certain level, the pressure relief valve closes, ultimately controlling the pressure inside the hood within a certain pressure range.

[0020] This invention pertains 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 cord 6. It features the characteristic of converting pressure into tension and can operate under relatively 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, thus meeting the development requirements of protective breathing equipment. This invention proposes a pressure relief mechanism that is small in size, has a low trigger pressure, and a simple structure, satisfying the development needs of portable protective breathing equipment.

[0021] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

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

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