Valve type block valve

Abstract

The invention provides a valve type block valve. The valve type block valve comprises a valve body, a first spring, a second spring, a first spring seat, a second spring seat, a first valve element and a second valve element. A second cavity G is formed in the second valve port, the second valve element is arranged in the second cavity in a sliding mode, a second spring seat is installed in the second valve port, one end of the second spring is fixedly connected with the second spring seat, and the other end of the second spring is fixedly connected with the second valve element. The second valve element is kept at the position where the second valve port is opened under the action of the second spring, and when the flow from the inlet to the second valve port is gradually increased, the pressure difference can cause the second valve element to gradually compress the second spring till the second valve port is completely closed. According to the invention, the automatic cut-off of the aircraft oxygen system in the excess flow state is met, and the safety of the oxygen system is improved; according to the invention, the spring stiffness design is carried out again, and a cut-off flow adjusting device is added, so that the flow range during cut-off is reduced, and the cut-off sensitivity is improved.

Description

Technical Field

[0001] The invention relates to an aircraft oxygen system, in particular to a valve-type cut-off valve. Background Art

[0002] The shut-off valve is generally installed in the main pipeline of the aircraft oxygen system to control the automatic shut-off of oxygen in an over-flow state.

[0003] At present, the shut-off valves used in the oxygen systems of domestic aircraft are all foreign products. However, the shut-off flow of the existing devices is relatively large and it is difficult to meet the working needs of existing aircraft. Summary of the invention

[0004] The purpose of the present invention is to design a cut-off valve for an aircraft oxygen system to realize automatic cut-off of an oxygen overflow state and improve the safety of the aircraft oxygen system.

[0005] The technical solution of the present invention is:

[0006] Provided is a valve-type cut-off valve, comprising a valve body, a first spring 3, a second spring 8, a first spring seat 2, a second spring seat 9, a first valve core 4 and a second valve core 6;

[0007] The valve body is a three-way structure, forming an inlet 5, a first valve port 1 and a second valve port 7; the inlet is an oxygen inlet;

[0008] A first cavity E is formed in the first valve port, the first valve core is slidably disposed in the first cavity, and a spring seat is installed in the first valve port, one end of the first spring is fixedly connected to the spring seat, and the other end is fixedly connected to the first valve core, and the first valve core is kept in a position of opening the first valve port under the action of the first spring, and when the flow from the inlet to the first valve port gradually increases, the pressure difference causes the first valve core to gradually compress the first spring to completely close the first valve port;

[0009] A second cavity G is formed in the second valve port, the second valve core is slidably disposed in the second cavity, and a second spring seat is installed in the second valve port, one end of the second spring is fixedly connected to the second spring seat, and the other end is fixedly connected to the second valve core, and the second valve core is maintained at a position of opening the second valve port under the action of the second spring, and when the flow from the inlet to the second valve port gradually increases, the pressure difference will cause the second valve core to gradually compress the second spring to completely close the second valve port.

[0010] Furthermore, the first spring seat is threadedly matched with the first valve port, and the preload force of the first spring can be adjusted by rotating the first spring seat.

[0011] Furthermore, the second spring seat is threadedly matched with the second valve port, and the preload force of the second spring can be adjusted by rotating the second spring seat.

[0012] Furthermore, the first spring is a coil spring.

[0013] Furthermore, the second spring is a coil spring.

[0014] Furthermore, the first valve core has a flange edge, and the flange edge can close the first valve port to achieve complete closure (truncation).

[0015] Furthermore, the second valve core has a flange edge, and the flange edge can close the first valve port to achieve complete closure (truncation).

[0016] The advantages of the present invention are as follows: the present invention satisfies the automatic cutoff of the aircraft oxygen system under the overflow state, thereby improving the safety of the oxygen system; compared with the prior art, the spring stiffness is redesigned in this scheme, a cutoff flow regulating device is added, the flow range during cutoff is narrowed, and the cutoff sensitivity is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a valve-type shut-off valve diagram used in aircraft oxygen systems.

[0018] First valve port 1, first spring seat 2, first spring 3, first valve core 4, inlet 5, second valve core 6, second valve port 7, second spring 8, second spring seat 9, first cavity E, second cavity G. DETAILED DESCRIPTION

[0019] The disclosed examples will be more fully described with reference to the accompanying drawings, in which some (but not all) of the disclosed examples are shown. In fact, many different examples may be described and these examples should not be construed as limited to the examples set forth herein. Instead, these examples are described so that this disclosure will be thorough and complete and will fully convey the scope of the disclosure to those skilled in the art.

[0020] The description of different advantageous arrangements has been presented for purposes of illustration and description, but the description is not intended to be exclusive or limited to examples of the disclosed form. Many modifications and variations will be apparent to those of ordinary skill in the art. Additionally, different advantageous examples may describe different advantages over other advantageous examples. The selected example or examples are chosen and described in order to best illustrate the principles of the examples, the practical application, and to enable those of ordinary skill in the art to understand the disclosure with various examples with various modifications suitable for the particular use contemplated.

Claims

1. A valve-type cut-off valve, characterized in that: It includes a valve body, a first spring, a second spring, a first spring seat, a second spring seat, a first valve core and a second valve core; The valve body is a three-way structure, forming an inlet, a first valve port 1 and a second valve port; the inlet is an oxygen inlet; A first cavity E is formed in the first valve port, the first valve core is slidably disposed in the first cavity, and a spring seat is installed in the first valve port, one end of the first spring is fixedly connected to the spring seat, and the other end is fixedly connected to the first valve core, and the first valve core is kept in a position of opening the first valve port under the action of the first spring, and when the flow from the inlet to the first valve port gradually increases, the pressure difference causes the first valve core to gradually compress the first spring to completely close the first valve port; A second cavity G is formed in the second valve port, the second valve core is slidably disposed in the second cavity, and a second spring seat is installed in the second valve port, one end of the second spring is fixedly connected to the second spring seat, and the other end is fixedly connected to the second valve core, and the second valve core is maintained at a position of opening the second valve port under the action of the second spring, and when the flow from the inlet to the second valve port gradually increases, the pressure difference will cause the second valve core to gradually compress the second spring to completely close the second valve port.

2. A valve-type shut-off valve according to claim 1, characterized in that: The first spring seat is threadedly matched with the first valve port, and the preload force of the first spring can be adjusted by rotating the first spring seat.

3. A valve-type shut-off valve according to claim 1, characterized in that: The second spring seat is threadedly matched with the second valve port, and the preload force of the second spring can be adjusted by rotating the second spring seat.

4. A valve-type shut-off valve according to claim 1, characterized in that: The first spring is a coil spring.

5. A valve-type shut-off valve according to claim 1, characterized in that: The second spring is a coil spring.

6. A valve-type shut-off valve according to claim 1, characterized in that: The first valve core has a flange edge, and the flange edge can close the first valve port to achieve complete closure (truncation).

7. A valve-type shut-off valve according to claim 1, characterized in that: The second valve core has a flange edge, and the flange edge can close the first valve port to achieve complete closure (truncation).

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