Mechanical oxygen supply flow indicator for aviation oxygen mask

Abstract

The invention relates to a mechanical oxygen supply flow indicator for an aviation oxygen mask, which comprises a sleeve tube partially or completely made of transparent materials, an oxygen inlet tube is arranged on one side of the sleeve tube, an oxygen outlet tube is arranged on the other side of the sleeve tube, the sleeve tube is provided with an inner cavity, a flow indicating block is arranged on one side, close to the oxygen inlet tube, in the inner cavity, and an adjusting device is arranged on one side, close to the oxygen outlet tube, in the inner cavity. A spring is arranged between the flow indicating block and the adjusting device; the flow indicating block can slide along the inner cavity of the sleeve pipe, during working, oxygen enters the inner cavity from the oxygen inlet pipe, then passes through the gap between the side face of the flow indicating block and the wall of the inner cavity of the sleeve pipe, flows through the adjusting device and then flows out of the oxygen outlet pipe, and a user judges the oxygen pressure and the airflow condition during oxygen supply by observing the position of the flow indicating block in the inner cylinder. The device adopts a pure mechanical structure, is simple and reliable, convenient to assemble and connect, small in size, light in weight, convenient to maintain and repair, visual in flow display and particularly suitable for being used on a mask oxygen supply pipeline.

Description

Technical Field

[0001] The present invention belongs to the field of aviation equipment, and particularly relates to a flow indicator for an aviation oxygen mask. Background Art

[0002] During flight operations, pilots need to wear special aviation oxygen supply masks. In order to facilitate pilots to observe the oxygen supply status of the aviation oxygen supply mask at any time, a flow indicator needs to be set on the oxygen supply pipeline; the existing flow indicators for aviation oxygen supply masks can only display whether oxygen is supplied through the oxygen supply pipeline, and it is impossible to directly understand whether the oxygen supply flow meets the index requirements during the oxygen supply process. The commonly used electronic flow indicators with readings on the market are too large in volume or weight, which will have an obvious impact on pilots wearing and using the masks.

[0003] For example, in the invention patent named "A Mechanical Oxygen Supply Flow Indicator for Aviation Oxygen Masks" (authorized announcement number CN103359289B) applied by our company in 2013, a mechanical oxygen supply flow indicator for aviation oxygen masks is disclosed, which includes an inner sleeve tube, an outer sleeve tube, a spring, a red piston block, a green piston block, an oxygen supply inlet pipe and an oxygen supply outlet pipe. The inner sleeve tube is a transparent tube, and a label is provided on the outer side surface of the middle part thereof. The oxygen supply inlet pipe is in interference fit with the inner sleeve tube, and the oxygen supply outlet pipe is in interference fit with the outer sleeve tube. This invention can directly understand the oxygen supply status of the aviation oxygen mask only through the visual inspection of the pilot, providing guarantee for safe operation, safe use and safety protection. However, with the increasing requirements for modern flight control, this kind of flow indicator that can only display whether oxygen is supplied has been difficult to meet the needs.

[0004] In view of this, it is necessary to propose a flow indicator that can display the flow rate. Summary of the Invention

[0005] The purpose of the present invention is to provide a mechanical flow indicator that can quantify the oxygen supply flow rate, has an intuitive effect, and is convenient and small.

[0006] In order to solve the above technical problems, the present invention discloses a mechanical oxygen supply flow indicator for an aviation oxygen mask, which includes a sleeve tube made of part or all transparent materials. An oxygen inlet tube is provided on one side of the sleeve tube, and an oxygen outlet tube is provided on the other side. The sleeve tube has an inner cavity. A flow indicating block is provided on the side near the oxygen inlet tube in the inner cavity, and an adjusting device is provided on the side near the oxygen outlet tube. A spring is provided between the flow indicating block and the adjusting device; the flow indicating block can slide along the inner cavity of the sleeve tube. During operation, oxygen enters the inner cavity from the oxygen inlet tube, then passes through the gap between the side surface of the flow indicating block and the inner cavity wall of the sleeve tube, flows through the adjusting device and then flows out from the oxygen outlet tube. The user judges the oxygen pressure and air flow conditions during oxygen supply by observing the position of the flow indicating block in the inner tube.

[0007] Preferably, the adjusting device is threadedly connected to the inner wall or the inner cavity wall of the oxygen inlet pipe. By rotating the adjusting device, the adjusting device moves along the inner cavity of the sleeve pipe to change the degree of compression on the spring, so as to adjust the elastic force exerted by the spring on the flow indicating block, in order to meet the index requirements for gas flow display under oxygen source interfaces with different pressures.

[0008] Preferably, the adjusting device is hollow to allow air flow through, and a slotted screwdriver notch for convenient adjustment by tools is provided at one end of the adjusting device near the oxygen outlet pipe.

[0009] Preferably, the side of the flow indicating block near the oxygen inlet pipe is spherical.

[0010] Preferably, the flow indicating block is spherical.

[0011] Preferably, the flow indicating block is connected to the spring.

[0012] Preferably, on the surface of the side of the flow indicating block near the oxygen inlet pipe, linear or curved oxygen flow channels are evenly arranged radially. The oxygen flow channels are formed by grooves or two raised stripes (the part in between). The oxygen flow channels are offset relative to the great circle line of the spherical surface. When oxygen flows through the flow indicating block, vortices are generated under the guidance of the oxygen flow channels, and further drive the flow indicating block to deflect along the axis. The faster the air flow, the greater the deflection angle of the flow indicating block. When the air flow is stable, the deflection angle of the flow indicating block also tends to be stable.

[0013] Preferably, the surface of the flow indicating block has two or more colors arranged around the axis of the flow indicating block.

[0014] Preferably, the sleeve pipe is composed of a first sleeve pipe with an oxygen inlet pipe and a second sleeve pipe with an oxygen outlet pipe. Among them, at least the second sleeve pipe is made of a transparent material.

[0015] Preferably, a scale is provided on the outer surface of the second sleeve pipe, and the scale gradually increases from the side of the oxygen inlet pipe to the side of the oxygen outlet pipe; the oxygen pressure and air flow conditions during oxygen supply are judged by observing the position of the flow indicating block in the inner cylinder.

[0016] The mechanical oxygen supply flow indicator for an aviation oxygen mask of the present invention has at least the following advantages: 1. Adopting a pure mechanical structure, it is simple and reliable, convenient for assembly and connection, small in size and light in weight, and suitable for connecting to the mask oxygen supply pipeline; 2. Once the oxygen source is connected during flight, the flow rate can be read immediately to check the oxygen supply performance, which is intuitive and convenient, and there is no need to use a complex and expensive electronic flow indicator that requires regular maintenance for detection; 3. It is convenient for maintenance and repair. When the flow rate does not meet the requirements, the tool can be inserted into the upper cover seat of the flow indicator, and the flow regulator can be turned to adjust the flow rate to meet the usage requirements; 4. The scale is adopted to quantify the oxygen flow rate, and the deflection of the flow indicating block is used to visually represent the oxygen flow velocity, providing the pilot with two ways to observe the oxygen flow rate and enabling adaptation to more application environments. Moreover, the setting of the oxygen flow channel can better stabilize the air flow, reduce the fluctuation of the flow indicating block in the up-down or left-right directions during air supply, reduce the friction or collision with the inner cavity wall, and extend the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 FIG. is a schematic three-dimensional structure diagram of a mechanical oxygen supply flow indicator for an aviation oxygen mask.

[0018] Figure 2 is Figure 1 FIG. is a schematic cross-sectional structure diagram taken along line A-A of the mechanical oxygen supply flow indicator for the aviation oxygen mask in FIG..

[0019] Figure 3 is Figure 1 FIG. is a schematic internal structure diagram of the mechanical oxygen supply flow indicator for the aviation oxygen mask in FIG. (hiding the second sleeve tube).

[0020] Figure 4 FIG. is a schematic diagram of the oxygen flow channel distribution on the surface of the flow indicating block near the oxygen inlet tube.

[0021] The reference numerals in the figures are: sleeve tube 1, first sleeve tube 101, second sleeve tube 102, scale 103, oxygen inlet tube 2, oxygen outlet tube 3, inner cavity 4, adjusting device 5, single-notch 501, air flow channel 502, spring 6, flow indicating block 7, oxygen flow channel 701. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following further elaborates on the present invention through embodiments, enabling those skilled in the art to implement it with reference to the text of the specification.

[0023] It should be understood that the terms such as "having", "comprising", and "including" used herein do not exclude the presence or addition of one or more other elements or their combinations.

[0024] Such as Figures 1-2As shown in the figure, a mechanical oxygen supply flow indicator for an aviation oxygen mask includes a sleeve tube 1 made of a transparent material partially or entirely. An oxygen inlet tube 2 is provided on one side of the sleeve tube, and an oxygen outlet tube 3 is provided on the other side. The sleeve tube has an inner cavity 4. A flow indicating block 7 is provided on the side near the oxygen inlet tube in the inner cavity, and an adjusting device 5 is provided on the side near the oxygen outlet tube. A spring 6 is provided between the flow indicating block and the adjusting device. The flow indicating block can slide along the inner cavity of the sleeve tube. During operation, oxygen enters the inner cavity from the oxygen inlet tube, then passes through the gap between the side of the flow indicating block and the inner cavity wall of the sleeve tube, flows through the adjusting device, and then flows out from the oxygen outlet tube. The user can judge the oxygen pressure and air flow conditions during oxygen supply by observing the position of the flow indicating block in the inner tube.

[0025] The adjusting device is threadedly connected to the inner wall or the inner cavity wall of the oxygen inlet tube. By rotating the adjusting device, the adjusting device moves along the inner cavity of the sleeve tube to change the degree of compression on the spring, so as to adjust the elastic force exerted by the spring on the flow indicating block to meet the index requirements for gas flow display under oxygen source interfaces with different pressures.

[0026] As Figure 3 shown in the figure, the adjusting device is hollow (with an air flow channel 502 in the middle) for air flow to pass through, and a slotted screwdriver notch 501 for convenient tool adjustment is provided at one end of the adjusting device near the oxygen outlet tube. After replacing the interface or the gas source pressure, a screwdriver can be inserted from the side of the oxygen outlet tube to make corresponding adjustments to the adjusting device, so that the scale display on the sleeve tube is more accurate.

[0027] The side of the flow indicating block near the oxygen inlet tube is spherical, and the other side can be columnar, tubular spherical, etc. In this embodiment, the flow indicating block is a sphere.

[0028] Furthermore, as Figure 4As shown, the flow indicating block is connected to a spring. The adjusting device abuts against the spring but is not fixedly connected. The spring can be limited to move only in the length direction of the inner cavity by providing a guide groove on the inner cavity wall or other means. In this way, when the air flow stops, the spring can reset the deflected flow indicating block. On the surface of the flow indicating block near the oxygen inlet pipe, linear or curved oxygen flow channels 701 are evenly arranged radially. The oxygen flow channels are composed of grooves or two raised stripes. The oxygen flow channels are offset relative to the great circle line of the spherical surface (the great circle line is the intersection line of the plane passing through the center of the sphere and the spherical surface). When the oxygen flows through the flow indicating block, a vortex is generated under the guidance of the oxygen flow channels, and further drives the flow indicating block to deflect along the axis. The faster the air flow, the larger the deflection angle of the flow indicating block. When the air flow is stable, the deflection angle of the flow indicating block also tends to be stable. It should be noted that when the surface of the flow indicating block abuts against one end of the oxygen inlet pipe, it forms a blockage for the oxygen inlet pipe, which can play a certain anti-backflow effect. This can be utilized in practical applications: for example, when other valves on the pipeline have problems, the flow indicating block can play a certain role in preventing gas backflow. To enhance the blocking effect of the flow indicating block on the oxygen inlet pipe, a sealing ring can be provided at the port of the oxygen inlet pipe near the flow indicating block. For the flow indicating block provided with oxygen flow channels, the oxygen flow channels may not be provided in the middle part corresponding to the oxygen inlet pipe in the oxygen flow channel area.

[0029] Furthermore, the surface of the flow indicating block has two or more colors arranged around the axis of the flow indicating block. The flow indicating block with multiple colors can more clearly and intuitively show the size of the deflection angle of the flow indicating block, so that it can be more easily observed by the pilot; in addition, the flow indicating block can also be made of fluorescent material or coated with a fluorescent coating on the surface. In this way, when the aircraft is briefly in a low-light environment, the pilot can still easily observe the flow indicating block and distinguish the colors, so as to judge the deflection angle of the flow indicating block.

[0030] Furthermore, as Figures 1-2 shown, the sleeve pipe is composed of a first sleeve pipe 101 with an oxygen inlet pipe and a second sleeve pipe 102 with an oxygen outlet pipe. Among them, at least the second sleeve pipe is made of a transparent material. A scale 103 is provided on the outer surface of the second sleeve pipe, and the scale gradually increases from the oxygen inlet pipe side to the oxygen outlet pipe side (the air flow size and the distance that the flow indicating block moves towards the oxygen outlet pipe side can be regarded as positively correlated); the oxygen pressure and air flow conditions during oxygen supply are judged by observing the position of the flow indicating block in the inner cylinder.

[0031] Although the embodiments of the present invention have been disclosed as above, it is not limited to only the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to specific details and the embodiments shown and described herein.

Claims

1. A mechanical oxygen supply flow indicator for an aviation oxygen mask, characterized in that: The invention comprises a sleeve tube which is partially or entirely made of transparent material, an oxygen inlet tube is arranged on one side of the sleeve tube, an oxygen outlet tube is arranged on the other side, the sleeve tube has an inner cavity, a flow indicator block is arranged on the side close to the oxygen inlet tube in the inner cavity, an adjusting device is arranged on the side close to the oxygen outlet tube, and a spring is arranged between the flow indicator block and the adjusting device; the flow indicator block can slide along the inner cavity of the sleeve tube, when working, oxygen enters the inner cavity from the oxygen inlet tube, then passes through the gap between the side of the flow indicator block and the inner cavity wall of the sleeve tube, flows through the adjusting device and then flows out from the oxygen outlet tube, and the user judges the oxygen pressure and airflow conditions during oxygen supply by observing the position of the flow indicator block in the inner tube; The surface of the flow indicator block on one side close to the oxygen inlet pipe is radially and evenly provided with straight or curved oxygen flow channels, the oxygen flow channels are composed of grooves or two raised stripes, and the oxygen flow channels are offset relative to the large circle line of the sphere. When oxygen flows through the flow indicator block, a vortex is generated under the guidance of the oxygen flow channel, and further drives the flow indicator block to deflect along the axis. The faster the airflow, the greater the deflection angle of the flow indicator block. When the airflow is stable, the deflection angle of the flow indicator block also tends to be stable.

2. The mechanical oxygen supply flow indicator for an aviation oxygen mask according to claim 1, characterized in that: The regulating device is threadedly connected to the inner wall or inner cavity wall of the oxygen inlet pipe. The regulating device is rotated to move along the inner cavity of the sleeve tube to change the degree of compression on the spring, thereby adjusting the elastic force applied by the spring to the flow indicator block to meet the index requirements of gas flow display under oxygen source interfaces of different pressures.

3. The mechanical oxygen supply flow indicator for an aviation oxygen mask according to claim 2, characterized in that: The regulating device is hollow to allow airflow to pass through, and one end of the regulating device near the oxygen outlet pipe is provided with a notch for facilitating tool adjustment.

4. The mechanical oxygen supply flow indicator for an aviation oxygen mask according to claim 1, characterized in that: The side of the flow indicating block close to the oxygen inlet pipe is a spherical surface.

5. The mechanical oxygen supply flow indicator for aviation oxygen masks according to claim 4, characterized in that: The flow indicating block is a sphere.

6. The mechanical oxygen supply flow indicator for an aviation oxygen mask according to claim 4, characterized in that: The flow indicating block is connected with a spring.

7. The mechanical oxygen supply flow indicator for an aviation oxygen mask according to claim 1, characterized in that: The surface of the flow indicating block has two or more colors arranged around the axis of the flow indicating block.

8. The mechanical oxygen supply flow indicator for aviation oxygen masks according to claim 1, characterized in that: The sleeve tube consists of a first sleeve tube with an oxygen inlet tube and a second sleeve tube with an oxygen outlet tube, wherein at least the second sleeve tube is made of a transparent material.

9. The mechanical oxygen supply flow indicator for aviation oxygen masks according to claim 8, characterized in that: The outer surface of the second sleeve tube is provided with scales, which gradually increase from the oxygen inlet pipe side to the oxygen outlet pipe side; the oxygen pressure and airflow conditions during oxygen supply can be judged by observing the position of the flow block in the inner tube.

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