Zero-leakage and mistakenly-mounting-preventing fuel oil one-way valve

Abstract

The utility model belongs to the technical field of one-way valves, and relates to a fuel oil one-way valve with reverse zero leakage and physical misloading prevention. Comprising a jacket nut, an inlet shell, an O-shaped ring, a shaft, a spring, a valve plate, a gasket a, a support, a gasket b and an outlet shell. According to the one-way valve, vulcanized rubber is arranged on the valve plate, the protruding face of the vulcanized rubber is designed to be in an arc shape, under the action of spring pressure and working medium pressure, the vulcanized rubber is matched with the ground valve seat sealing face on the inlet shell, and reverse zero leakage is achieved under small working pressure; and the inlet shell connecting pipe nozzle and the outlet shell connecting pipe nozzle are designed to be opposite connecting ports, so that the product is physically prevented from being mistakenly assembled.

Description

TECHNICAL FIELD

[0001] The utility model belongs to one -way valve technical field relates to a reverse zero leakage, physical mistake -proofing of fuel one -way valve. BACKGROUND

[0002] As the control element in each system of the airplane, the one-way valve has the functions of cutoff and anti-backflow, provides suitable pressure and temperature for the environmental control, fuel, lubricating oil and hydraulic systems, and is an indispensable accessory on the airplane. The requirement for the reverse sealing performance of the one-way valve in the fuel system of the airplane is becoming more and more severe, and some even require "zero leakage" and the ability to physically prevent misinstallation. At present, the sealing structure of the one-way valve mainly includes conical surface sealing and flat surface sealing, and the flat surface sealing is further divided into metal-to-metal sealing and metal-to-flat vulcanized rubber sealing. Both the two sealing structures cannot meet the requirement of "zero leakage". The measures for preventing misinstallation mainly include marking the medium flow direction arrow on the surface of the product, setting the product inlet and outlet pipeline to have different sizes, and installing a positioning pin. The surface marking of the medium flow direction arrow cannot physically prevent misinstallation, and can only be recognized by the human eye. If the product is installed reversely, it can still be installed, but cannot be normally used. If the inlet and outlet pipelines have different sizes, although the reverse installation cannot be normally installed, the system pipeline of the main machine needs to be consistent with the inlet of the product, and the size of the system pipeline needs to be changed. SUMMARY

[0003] The utility model aims at:

[0004] Solving the problems of "zero leakage" and misinstallation of the fuel one-way valve.

[0005] To solve the technical problem, the technical scheme of the utility model is:

[0006] A zero-leakage and misinstallation-preventing fuel one-way valve, comprising a sleeve nut, an inlet shell, an O-shaped ring, a shaft, a spring, a valve plate, a gasket a, a bracket, a gasket b and an outlet shell. The flared boss on the valve plate passes through the gasket a, the bracket and the gasket b in sequence, and is locked by the flared boss groove on the valve plate. One end of the spring is inserted into the spring hole in the bracket, and the other end is inserted into the spring hole in the inlet shell. Then the shaft passes through the inlet shell support hole, the bracket ear hole and the spring in sequence. The inlet shell is provided with a sealing groove for installing the O-shaped ring. The outlet shell is sleeved on the inlet shell and fastened by threads. The inlet end of the inlet shell is provided with a flat nozzle. The compression section of the sleeve nut is inserted into the flat nozzle and locked by flattening the compression section of the sleeve nut.

[0007] Further, the gasket a is arranged between the valve plate and the bracket to prevent friction between the valve plate and the bracket.

[0008] Further, the gasket b is sleeved on the flared boss of the valve plate to prevent friction between the flared part and the support.

[0009] Further, the valve plate is circumferentially provided with a vulcanization groove for vulcanized rubber, and the protruding surface of the vulcanized rubber is designed as a circular arc to reduce the contact area of the valve plate with the inlet shell.

[0010] Further, the vulcanization groove is specifically dovetail-shaped, which enlarges the contact area of the vulcanized rubber with the valve plate, increases the connection strength of the vulcanized rubber with the valve plate, and prevents the vulcanized rubber from being separated from the valve plate.

[0011] Further, the shaft has a length extending out of the inlet shell support hole between one gap and two gap lengths according to the gap between the inlet shell support and the outlet shell, so that the shaft can be prevented from being separated from the inlet shell support hole without being expanded or fastened by threads.

[0012] Further, the inlet shell is provided with an inner tapered flat nozzle, and the outlet shell is provided with an outer tapered threaded connector, so as to ensure the connection sealing and realize physical mistake prevention.

[0013] The technical effect of the utility model is that the one-way valve vulcanizes rubber on the valve plate, the protruding surface of the vulcanized rubber is designed as a circular arc, and under the action of spring pressure and working medium pressure, the valve plate cooperates with the ground valve seat sealing surface on the inlet shell to realize reverse "zero leakage" under small working pressure; the inlet shell connecting nozzle and the outlet shell connecting nozzle are designed as opposite connecting ports to physically avoid product misassembly. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is an inlet end sleeve nut structure diagram;

[0015] Figure 2 It is an inlet shell structure diagram;

[0016] Figure 3 It is a valve plate structure diagram;

[0017] Figure 4 It is a support structure diagram;

[0018] Figure 5 It is an outlet shell structure diagram;

[0019] Figure 6 It is a vulcanized valve plate assembly structure diagram;

[0020] Figure 7 It is a valve internal assembly structure diagram;

[0021] Figure 8 It is an inlet end assembly structure diagram before pressure collection;

[0022] Figure 9 The structure diagram of the inlet end is equipped with a compression section;

[0023] Figure 10 The structure diagram of a zero-leakage and mistake-proof fuel one-way valve.

[0024] Wherein N is a flat nozzle, and P is a compression section. DETAILED DESCRIPTION

[0025] To make the purposes, technical solutions and advantages of the utility model clearer, the technical solutions in the embodiments of the utility model will be described in more detail below in combination with the embodiments of the utility model. In the examples, the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The described embodiments are part of the embodiments of the utility model, rather than all the embodiments. The described examples below are exemplary and are intended to explain the utility model, and cannot be understood as limiting the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model. The embodiments of the utility model will be described in detail below.

[0026] The fuel one-way valve mainly comprises a sleeve nut, an inlet shell, an O-shaped ring, a shaft, a valve plate, a gasket, a bracket, an outlet shell and the like. The zero-sealing structure mainly comprises the valve plate and vulcanized rubber. The valve plate is designed with a vulcanization groove, and the vulcanization groove is designed in an irregular shape, i.e. a dovetail shape, and has a protruding sharp corner at the bottom, so as to increase the contact area between the rubber and the metal layer during vulcanization (see Figure 3 ). During vulcanization, the rubber is vulcanized into a circular arc shape, so as to reduce the contact area between the valve plate and the valve seat, and the diameter of the rubber arc needs to be smaller than the diameter of the vulcanization groove (see Figure 6 ), so as to reserve the compression area of the rubber and avoid damage to the vulcanization surface when the compression amount of the protruding part of the rubber is too large under the maximum pressure working condition. The mistake-proof structure at the inlet end mainly comprises the sleeve nut and the inlet shell. In the design, the sleeve nut is reserved with a compression section, and the sleeve nut is used in cooperation with the inlet shell. When the sleeve nut is designed, the inner diameter of the sleeve nut needs to be larger than the outer diameter of the flat nozzle of the inlet shell. One end of the sleeve nut is designed as a standard internal thread, and is connected with the external thread of the pipeline of the main system, and the other end (the compression section) is designed as a light pipe. One end of the inlet shell is designed as a standard flat nozzle, and is connected with the external thread of the main machine to play a sealing role. After compression of the compression section, the gap between the sleeve nut and the flat nozzle should be 0.2mm-0.6mm, so as to ensure that the sleeve nut can rotate freely.

[0027] The zero leakage seal structure mainly has two parts of a valve plate and vulcanized rubber, wherein the valve plate is a single plate structure and a main force component, is formed by machining, and the vulcanized rubber is a vulcanized part, and a convex part is in a circular arc shape and has high requirements for surface roughness and flatness.

[0028] The error-proof mounting part mainly has: an import end of the product is an import shell and a sleeve nut, and an export end is a common thread. The import end is connected with a system pipeline through the sleeve nut, a flat pipe nozzle is arranged at a connection position of the import shell and the sleeve nut, and the sleeve nut is installed in cooperation with the import shell after part processing, and the sleeve nut is pressed tightly through compression and decompression sections.

[0029] The fuel one-way valve comprises a sleeve nut (1), an import shell (2), an O-shaped ring (3), a shaft (4), a spring (5), a valve plate (6), a gasket a (7), a support (8), a gasket b (9) and an export shell (10). A flared boss on the valve plate (6) passes through the gasket a (7), the support (8) and the gasket b (9) in sequence, is locked by flaring of a boss groove on the valve plate (6), one end of the spring (5) is inserted into a spring hole in the support (8), the other end is installed into a spring hole in the import shell (2), then the shaft (4) passes through an import shell (2) support hole, a support (8) ear hole and the spring (5) in sequence, the import shell (2) is provided with a sealing groove for installing the O-shaped ring (3), the export shell (10) is sleeved on the import shell (2) and is fastened by threads, a flat pipe nozzle is formed on the import end of the import shell (2) by machining, the compression section of the sleeve nut (1) is installed on the flat pipe nozzle and is locked and assembled by flattening and locking of the compression section of the sleeve nut (1).

[0030] In an embodiment of the new type, the gasket a (7) is arranged between the valve plate (6) and the support (8) to prevent friction between the valve plate (6) and the support (8).

[0031] In an embodiment of the new type, the gasket b (9) is sleeved on the flared boss of the valve plate (6) to prevent friction between the flared part and the support (8).

[0032] In an embodiment of the new type, a vulcanization groove is arranged on the valve plate (6) in a circumferential direction for vulcanized rubber, a convex surface of the vulcanized rubber is designed in a circular arc shape to reduce a contact area of the valve plate (6) with the import shell (2).

[0033] In an embodiment of the new type, the vulcanization groove is specifically dovetail-shaped, expands the contact area of the vulcanized rubber with the valve plate (6), increases the connection strength of the vulcanized rubber with the valve plate, and prevents the vulcanized rubber from being separated from the valve plate (6).

[0034] In one embodiment of the new type, the length of the shaft (4) extending out of the hole of the inlet shell (2) is designed between one gap and two gaps, without the need of flaring or threaded fastening to ensure that the shaft (4) does not come out of the hole of the inlet shell (2).

[0035] In one embodiment of the new type, the inlet shell (2) has a flat nozzle with an inner taper surface, and the outlet shell (10) has a threaded joint with an outer taper surface, which ensures the sealing of the connection and realizes the physical mistake-proofing.

[0036] The method of the present application can achieve zero sealing that cannot be achieved by the original taper sealing or flat sealing of the fuel check valve.

[0037] The skilled in the art can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have meanings consistent with those in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless otherwise defined. The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not intended to limit the present application. Any skilled in the art can modify or improve the above disclosed technical content to obtain equivalent embodiments applied to other fields, but any simple modification, equivalent change and improvement made on the basis of the technical essence of the present application should be included in the protection scope of the present application.

Claims

1. A zero-leak, mis-mounting proof fuel check valve characterized by, The utility model discloses a valve nut, import shell, O ring, shaft, spring, valve plate, washer a, support, washer b, export shell, the flared boss on valve plate passes washer a, support, washer b in proper order and is locked through the flared boss groove on valve plate, and one end of spring inserts into the spring hole on support, and the other end is installed in the spring hole on import shell, then the shaft passes import shell support column hole, support lug hole, spring in proper order, and import shell sets up sealing groove for installing O ring, and export shell is sleeved on import shell and is fastened through the screw thread, and the import end of import shell is machined with flat nozzle, and the compression section of sleeve nut is installed on flat nozzle and is locked through the compression section of sleeve nut and is assembled.

2. The one-way valve of claim 1, wherein The utility model also includes washer a, which is arranged between the valve plate and the support to prevent friction between the valve plate and the support.

3. The one-way valve of claim 2, wherein, The utility model also includes washer b, which is sleeved on the flared boss of the valve plate to prevent friction between the flared boss and the support.

4. The one-way valve of claim 3, wherein The valve plate is circumferentially provided with vulcanization grooves for vulcanized rubber, and the convex surface of the vulcanized rubber is designed as a circular arc to reduce the contact area of the valve plate with the import shell.

5. The one-way valve of claim 4, wherein, The vulcanization groove is specifically dovetail-shaped, which enlarges the contact area of the vulcanized rubber with the valve plate, increases the connection strength of the vulcanized rubber with the valve plate, and prevents the vulcanized rubber from being separated from the valve plate.

6. The one-way valve of claim 5, wherein, The length of the shaft extending out of the import shell support column hole is designed to be between one gap and two gap lengths according to the gap between the import shell support column and the export shell.

7. The one-way valve of claim 6, wherein The import shell is provided with an inner tapered flat nozzle, and the export shell is provided with an outer tapered threaded joint, which ensures the connection sealing and realizes physical mistake-proofing.

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