Miniature exhaust screw assembly with waterproof and dustproof functions

Abstract

The miniature exhaust screw assembly with the waterproof and dustproof functions comprises a screw rod and a head, an exhaust channel extending into the head is formed in the tail end of the screw rod, an annular groove with the section of a V-shaped structure is formed in the head in the circumferential direction, a plurality of exhaust holes are evenly formed in the bottom of the annular groove and communicate with the exhaust channel, and the exhaust channel is communicated with the exhaust channel. A blocking ring is connected in the annular groove in a sleeved mode, can cover the exhaust hole and can expand and deform under the action of high-pressure gas exhausted through the exhaust hole. The assembly has the beneficial effects that the assembly is installed at the exhaust port of the air pressure valve, internal high-pressure gas outwards acts on the plugging ring through the exhaust channel and the exhaust hole to enable the plugging ring to deform and expand outwards, then a gap is formed between the plugging ring and the side wall of the annular groove, and the gas is exhausted from the gap; when air is not exhausted, the sealing ring completely covers the exhaust hole, and the waterproof and dustproof effects are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of air pressure valve accessories, and in particular relates to a miniature exhaust screw assembly with waterproof and dustproof functions. Background Art

[0002] Pneumatic valve products are important components of aircraft pneumatic control systems, which determine the control quality of the aircraft and the realization of important functions. Aircraft pneumatic control systems generally contain two-position three-way pneumatic solenoid valves that control the reversal of the air path. When the two-position three-way pneumatic solenoid valve is working, high-pressure gas will enter from the air inlet of the pneumatic valve, pass through the valve pair inside the pneumatic valve, and be output from the working port of the pneumatic valve to control the operation of the actuator downstream of the pneumatic valve; when the pneumatic valve stops working, the valve pair inside the pneumatic valve closes, the air inlet and working port of the pneumatic valve are cut off, and the remaining gas in the system and the high-pressure gas inside the pneumatic valve will be discharged from the exhaust port of the pneumatic valve.

[0003] The exhaust port of the traditional two-position three-way air pressure solenoid valve is mostly opened on the surface of the shell, and a filter is added to prevent the entry of foreign matter with larger particle size, but it has no protective effect on foreign matter, dust, and water vapor below the filtering accuracy of the filter. If the foreign matter and dust that enters adhere to the valve pair inside the air pressure valve, the movement of the valve pair when the air pressure valve is working can easily cause damage to the sealing ring of the valve pair, resulting in failure of the seal of the solenoid valve product or reduced performance; if the foreign matter and dust that enters adhere to the moving parts such as the armature and valve core inside the solenoid valve, it can easily increase the friction and make the air pressure valve inflexible; the entry of water vapor can easily cause corrosion of the internal components of the air pressure valve. If the water vapor freezes under low temperature conditions, it can easily cause the moving parts such as the armature and valve core inside the air pressure valve to get stuck, making the air pressure valve function ineffective, which can seriously affect flight safety. Summary of the invention

[0004] In view of this, the present invention aims to overcome the shortcomings of the above-mentioned problems in the prior art and proposes a miniature exhaust screw assembly with waterproof and dustproof functions.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] A miniature exhaust screw assembly with waterproof and dustproof functions comprises a screw rod and a head, an exhaust passage extending into the head is provided at the end of the screw rod, an annular groove with a V-shaped cross section is provided circumferentially of the head, and a plurality of exhaust holes are evenly provided at the bottom of the annular groove, the plurality of exhaust holes are all connected with the exhaust passage, a sealing ring is sleeved in the annular groove, the sealing ring can cover the exhaust holes, and can expand and deform under the action of high-pressure gas discharged through the exhaust holes.

[0007] Furthermore, the angle between the two side walls of the annular groove is 60°.

[0008] Furthermore, a limiting convex edge is protruding outwardly from the outer circumferential side wall of the head corresponding to the outer edge of the annular groove opening.

[0009] Furthermore, there are two exhaust holes, which are symmetrically arranged along the scheduling channel.

[0010] Furthermore, a groove is provided on the outer end surface of the head.

[0011] Compared with the prior art, the present invention has the following advantages:

[0012] The micro exhaust screw assembly with waterproof and dustproof functions described in the present invention is installed at the exhaust port of the air pressure valve, an exhaust channel is arranged in the screw, and an exhaust hole connected to the exhaust channel is arranged on the head, and a sealing ring is arranged in the annular groove arranged circumferentially in the head. When no exhaust is performed, the exhaust hole is covered by the sealing ring to play a waterproof and dustproof role, and when exhaust is required, the internal high-pressure gas acts on the sealing ring through the exhaust channel and the exhaust hole, causing it to deform and expand outward, thereby forming a gap between it and the side wall of the annular groove, and the gas is discharged from the gap; the assembly is easy to operate, easy to disassemble and assemble, and has interchangeability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0014] Figure 1 This is a schematic structural diagram of a micro exhaust screw assembly with waterproof and dustproof functions according to an embodiment of the present invention.

[0015] Description of reference numerals:

[0016] 1. Screw; 2. Head; 3. Exhaust channel; 4. Exhaust hole; 5. Annular groove; 6. Sealing ring; 7. Limiting convex edge; 8. Groove. DETAILED DESCRIPTION

[0017] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0018] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0020] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0021] As shown in the figure, a miniature exhaust screw assembly with waterproof and dustproof functions includes a screw rod 1 and a head 2. An exhaust channel 3 extending into the head 2 is provided at the end of the screw rod 1. The head 2 is circumferentially provided with an annular groove 5 with a V-shaped cross-section, and a plurality of exhaust holes 4 are evenly provided at the bottom of the annular groove 5. The plurality of exhaust holes 4 are all connected to the exhaust channel 3. A sealing ring 6 is sleeved in the annular groove 5. The sealing ring 6 can cover the exhaust hole 4 and can expand and deform under the action of the high-pressure gas discharged through the exhaust hole 4.

[0022] The angle between the two side walls of the annular groove 5 is 60°.

[0023] A limiting ridge 7 is protruding outwardly from the outer peripheral wall of the head 2 corresponding to the outer edge of the opening of the annular groove 5, and the sealing ring 6 is limited by the limiting ridge 7 to prevent the sealing ring 6 from expanding and deforming too much and falling out of the annular groove 5.

[0024] There are two exhaust holes 4, which are symmetrically arranged along the exhaust channel to ensure that the sealing ring 6 can expand and deform symmetrically outward during exhaust.

[0025] A groove 8 is provided on the outer end surface of the head 2, which can be a straight or cross shape and is used for positioning a screwdriver to turn the screw.

[0026] In this embodiment, the sealing ring is made of FS6265 fluorosilicone rubber.

[0027] In this embodiment, the diameter of the exhaust channel 3 is 1.5mm; the diameter of the exhaust hole 4 is 0.5mm; the inner diameter of the sealing ring 6 is 3.1mm, and the cross-sectional diameter is 1.8mm; the diameter of the outer end surface of the head 2 is 8mm. With this design, the sealing ring 6 is expanded and deformed to form a gap between the sealing ring 6 and the annular groove 5 under the action of the high-pressure gas that needs to be discharged from the inside of the air pressure valve, so that the high-pressure gas is discharged from the gap. According to the test, the maximum working pressure that the screw assembly can be applied to is 31.5Mpa.

[0028] The working process of this embodiment is as follows:

[0029] The screw assembly is screwed and tightened on the exhaust port of the air pressure valve. When exhaust is required, the sealing ring 6 is expanded and deformed under the action of the high-pressure gas inside the air pressure valve to form a gap between it and the annular groove 5, so that the high-pressure gas is discharged outward from the gap; after the internal gas is discharged, the sealing ring 6 is reset in the annular groove 5 to cover the exhaust hole 4, ensuring that the exhaust hole 4 will not be exposed, thereby achieving a waterproof and dustproof effect at the exhaust hole 4.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A miniature exhaust screw assembly with waterproof and dustproof functions, characterized in that: It includes a screw and a head. An exhaust channel extending into the head is provided at the end of the screw. An annular groove with a V-shaped cross-section is provided circumferentially of the head. A plurality of exhaust holes are evenly provided at the bottom of the annular groove. The plurality of exhaust holes are all connected to the exhaust channel. A sealing ring is sleeved in the annular groove. The sealing ring can cover the exhaust holes and can expand and deform under the action of the high-pressure gas discharged through the exhaust holes.

2. A micro exhaust screw assembly with waterproof and dustproof functions according to claim 1, characterized in that: The angle between the two side walls of the annular groove is 60°.

3. The micro exhaust screw assembly with waterproof and dustproof functions according to claim 1, characterized in that: A limiting convex edge is protruded outwardly at the outer circumferential side wall of the head corresponding to the outer edge of the opening of the annular groove.

4. The micro exhaust screw assembly with waterproof and dustproof functions according to claim 1, characterized in that: There are two exhaust holes, which are symmetrically arranged along the scheduling channel.

5. The micro exhaust screw assembly with waterproof and dustproof functions according to claim 1, characterized in that: A groove is arranged on the outer end surface of the head.

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