Adjustable air pressure reducing valve with pressure relief function

Abstract

The utility model discloses an adjustable air pressure reducing valve with a pressure relief function, which is of a linkage integrated structure consisting of an inlet pipe nozzle, a reset spring, a shunting valve component, a shell, a valve component, a piston, a pressure regulating spring, a gland, a regulating rod and an outlet pipe nozzle, integrates the pressure reducing function and the pressure relief function, can meet the requirement of regulating the required pressure of a system at any time, and is convenient to operate. When the pressure exceeds the required range, the pressure can be adjusted through the product, and the processes of pressure relief, pressurization adjustment and the like are not needed; by controlling the adjusting rod of the air pressure reducing valve, the product can achieve the functions of adjusting the pressure required by the system, relieving the pressure and the like, so that the pressure required by the system can be accurately controlled.

Description

TECHNICAL FIELD

[0001] The utility model belongs to pressure control technical field, concretely relates to a kind of adjustable air pressure pressure reducing valve with pressure relief function. BACKGROUND

[0002] Air pressure pressure reducing valve is one of auxiliary units of pneumatic unit combination instrument. It is from air compressor, adjusts to the required pressure value and carries out steady voltage to each kind of pneumatic instrument and other pneumatic equipment with stable air source detection pressure. Currently, fuel system air tightness tester carries out air tightness test and the pressure value detection of each tank group generally adopts multiple pressure reducing valve and pressure relief valve to carry out manual switching, and test process is tedious, time-consuming and laborious. CONTENT OF UTILITY MODEL

[0003] To solve the above problem, provide a kind of adjustable air pressure pressure reducing valve with pressure relief function, for fuel system air tightness tester, when carrying out air tightness test and the pressure value detection of each tank group to aircraft fuel system, can be adjusted only by air pressure pressure reducing valve, so that system air source reaches the required test pressure. It is a kind of air pressure pressure reducing valve, which is integrated, compact in structure, easy to assemble, high in reliability, and can support the function of freely adjusting system pressure and discharging pipeline pressure.

[0004] This utility model provides a solution for an adjustable pneumatic pressure reducing valve with a pressure relief function. The valve comprises an inlet nozzle, a return spring, a diversion valve assembly, a housing, a valve assembly, a piston, a pressure regulating spring, a pressure cap, an adjusting rod, and an outlet nozzle, forming a linked integrated structure. The housing has an inverted Y-shaped channel; the upper channel connects to the adjusting rod, and the two lower channels connect to the inlet nozzle and outlet nozzle respectively. The outlet nozzle is sealed to the inner side of the housing, and the outer side of the inlet nozzle is sealed to the inner side of the housing. The inner side of the inlet nozzle has two stepped cavities, with a smaller inner diameter near the inlet. The bottom end of the return spring contacts the lower stepped surface, and the upper end of the return spring is placed in the annular groove at the lower end of the diversion valve assembly. The lower end face of the diversion valve assembly can abut against the upper stepped surface of the nozzle. The extension is fixedly connected to the valve assembly. The diversion valve assembly is clearance-fitted with the inner side of the housing. The valve assembly is clearance-fitted with the inner side of the housing. A piston is provided at the upper end of the valve assembly. The outer side of the piston is sealed to the inner side of the housing. A protrusion is provided at the lower end of the piston. A through hole is provided along the axial center of the protrusion. A groove is provided axially downward on the upper end face of the piston. The groove communicates with the through hole. One end of the pressure regulating spring is placed in the groove and the other end is sleeved on the outer side of the adjusting rod. A convex ring is provided on the outer side of the adjusting rod. The pressure regulating spring is placed below the convex ring. A T-shaped channel is provided inside the adjusting rod. The pressure cap has a hollow columnar structure with a stepped surface on the inner side. The upper end face of the convex ring abuts against the stepped surface. A second convex ring is provided on the outer side of the pressure cap. The second convex ring abuts against the top of the housing. A third convex ring is provided on the outer side of the outlet nozzle abuts against the lower end face of the housing.

[0005] Furthermore, a second sealing ring is provided at the connection between the piston and the housing.

[0006] Furthermore, a second sealing ring is provided at the connection between the piston and the housing.

[0007] Furthermore, a sealing ring is provided at the connection between the outlet nozzle and the housing.

[0008] Furthermore, the upper end of the valve assembly is provided with a groove II filled with polyetheretherketone and polyimide engineering plastics, and the diameter of the groove II is larger than the maximum diameter of the protrusion.

[0009] Furthermore, a sealing ring is provided at the contact point between the top of the diversion valve assembly and the housing, and the sealing ring is made of polyetheretherketone or polyimide engineering plastics.

[0010] Furthermore, the housing has a conical protrusion at the contact point with the sealing ring.

[0011] The adjustable pressure reducing valve with pressure relief function is a normally closed pressure reducing valve structure, when the aircraft fuel system needs to be tested for air tightness and the pressure of each tank group is detected, the adjusting rod of the pressure reducing valve is pressed, the compression spring is compressed, the piston pushes the shunt valve assembly to open, the inlet pressure flows to the product outlet, when the outlet pressure reaches the required test pressure of the system, the shunt valve assembly and the shell are gradually closed under the action of the inlet pressure and the elastic force of the reset spring, when the outlet pressure is higher than the required pressure of the system, the adjusting rod of the pressure reducing valve is returned, the elastic force of the spring is reduced, the piston is pushed upward under the action of the outlet pressure, the piston and the valve assembly are opened, so that the pressure relief is realized.

[0012] The beneficial effects of the utility model are as follows:

[0013] (1) The adjustable pressure reducing valve with pressure relief function adopts a reverse-acting pressure reducing valve structure of piston structure, the piston is used as a pressure sensing moving element, the valve travel and opening degree are increased, the product outlet flow is increased, and the adjustment range of the outlet pressure of the pressure reducing valve is improved.

[0014] (2) The adjustable pressure reducing valve with pressure relief function adopts a reverse-acting pressure reducing valve structure, and the inlet pressure is more helpful to the sealing of the product.

[0015] (3) The adjustable pressure reducing valve with pressure relief function combines the pressure reducing function and the pressure relief function as a whole, can meet the requirement of adjusting the pressure of the system at any time, when the pressure exceeds the required range, the product can also be adjusted, without the process of re-releasing pressure, pressurizing and adjusting, and is more convenient and fast to use.

[0016] (4) The pressure reducing function and the pressure relief function structure of the adjustable pressure reducing valve with pressure relief function adopt a linkage integrated structure, the product parts are reduced, the sealing structure is reduced, the volume is reduced, the weight is reduced, and the reliability of the product is improved.

[0017] (5) The dynamic sealing of the adjustable pressure reducing valve with pressure relief function adopts a conical surface seal, the sealing material adopts polyether ether ketone or polyimide material with high compression strength, and the valve action cycle life is prolonged.

[0018] (6) The design idea of modular assembly is adopted, the equipment is simple, misoperation is not easy to occur, the skill level requirement of the assembly personnel is low, and the product maintenance and repair are also convenient. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings incorporated into the specification and constituting a part of the specification show embodiments consistent with the present application and, together with the specification, serve to explain the principles of the present application. It is apparent that the drawings described below are only some embodiments of the present application, and other drawings can be obtained from these drawings by those skilled in the art without creative labor. In the drawings:

[0020] Figure 1 A structure schematic diagram of the adjustable gas pressure reducing valve with pressure relief function provided by the present application is shown in the figure.

[0021] Figure 2 A structure schematic diagram of one working state of the adjustable gas pressure reducing valve with pressure relief function provided by the present application is shown in the figure.

[0022] Figure 3 Another structure schematic diagram of one working state of the adjustable gas pressure reducing valve with pressure relief function provided by the present application is shown in the figure.

[0023] In the drawings: 1 - inlet nozzle, 1.1 - lower stepped surface, 1.2 - upper stepped surface,

[0024] 2 - reset spring

[0025] 3 - shunt valve assembly, 3.1 - sealing ring

[0026] 4 - sealing ring one

[0027] 5 - shell, 5.1 - Y-shaped channel, 5.2 - protrusion two

[0028] 6 - valve assembly, 6.1 - groove two

[0029] 7 - piston, 7.1 - protrusion, 7.2 - groove one, 7.3 - through hole

[0030] 8 - sealing ring two

[0031] 9 - pressure regulating spring

[0032] 10 - gland, 10.1 - stepped surface, 10.2 - protruding ring two

[0033] 11 - adjusting rod, 11.1 - protruding ring one, 11.2 - T-shaped channel

[0034] 12 - sealing ring three

[0035] 13 - outlet nozzle, 13.1 - protruding ring three. DETAILED DESCRIPTION

[0036] Example implementations are now described with reference to the drawings. Example implementations can, however, be implemented in many different forms and should not be construed as limited to the examples set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the inventive concept to those skilled in the art.

[0037] Referring now to the drawings, there is shown in Figure 1The utility model provides a pressure relief function's adjustable pressure reducing valve structure schematic diagram provided with the utility model, by import pipe nozzle 1, reset spring 2, shunt valve assembly 3, casing 5, valve assembly 6, piston 7, pressure regulating spring 9, gland 10, adjusting rod 11, export pipe nozzle 13 constitute linkage integral type structure, the inside of casing 5 is equipped with inverted Y type passageway 5. 1, the passageway that is located upper is connected with adjusting rod 11, the two passageways that are located below are connected with import pipe nozzle 1 and export pipe nozzle 13 respectively, export pipe nozzle 13 and casing 5 inboard seal connection, import pipe nozzle 1 outside and casing 5 inboard seal connection, import pipe nozzle 1 inboard is equipped with two layers of ladder inner cavity, and the inner diameter is small near the import, reset spring 2 bottom end and lower layer ladder face 1. 1) contact, reset spring 2 upper end is placed in shunt valve assembly 3 lower end annular groove, and shunt valve assembly 3 lower end face can resist import pipe nozzle 1 upper layer ladder face 1. 2, and shunt valve assembly 3 upper end extension part is fixedly connected with valve assembly 6, and shunt valve assembly 3 and casing 5 inboard clearance fit, and valve assembly 6 and casing 5 inboard clearance fit, and valve assembly 6 upper end is equipped with piston 7, and piston 7 outside and casing 5 inboard seal connection, and piston 7 lower end is equipped with convex one 7. 1, and convex one 7. 1 is equipped with through -hole 7. 3 along the axial center, and valve assembly 6 upper end face is equipped with recess one 7. 2 along the axial downward, and recess one 7. 2 is communicated with through -hole 7. 3, and pressure regulating spring 9 one end is placed in recess one 7. 2, and the other end is sheathed in adjusting rod 11 outside, and adjusting rod 11 outside is equipped with convex ring one 11. 1, and pressure regulating spring 9 is placed below convex ring one 11. 1, and adjusting rod 11 is equipped with T type passageway 11. 2, and gland 10 hollow columnar structure, and inboard is equipped with step face 10. 1, and convex ring one 11. 1 upper end face resists step face 10. 1, and gland 10 outside is equipped with convex ring two 10. 2, and convex ring two 10. 2 resists casing 5 top end, and export pipe nozzle 13 outside is equipped with convex ring three 13. 1 and resists casing 5 lower end face. The junction of import pipe nozzle 1 and casing 5 is equipped with sealing ring one 4, the junction of piston 7 and casing 5 is equipped with sealing ring two 8, the junction of export pipe nozzle 13 and casing 5 is equipped with sealing ring three 12, and valve assembly 6 upper end is equipped with recess two 6. 1, and recess two 6. 1 is filled with polyether ether ketone, polyimide class engineering plastics, and recess two 6. 1 diameter is greater than convex one 7. 1 maximum diameter, and shunt valve assembly 3 top and casing 5 contact place is equipped with sealing ring 3. 1, and sealing ring 3. 1 adopts polyether ether ketone, polyimide class engineering plastics, and casing 5 and sealing ring 3. 1 contact place is equipped with convex two 5. 2 and is conical structure. The piston 7 is the pressure sensing actuating element of product, adjusting rod 11 is through pressing pressure regulating spring 9 and is with spring force on piston 7, piston contacts valve assembly 6, and promotes valve assembly and transmits the spring force to shunt valve assembly 3, and shunt valve assembly comes and goes and opens and closes, realizes the function of stable outlet pressure.

[0038] Non-working state: as Figure 1As shown, the inlet pressure is cut off by the seal formed by the shunt valve assembly 3 and the housing 5, keeping the outlet pressureless, and the inlet nozzle 1 and the outlet nozzle 13 of the gas pressure reducing valve are both sealed by the sealing ring to ensure the external sealing of the product.

[0039] Working state: as shown in Figure 2 As shown, when the aircraft fuel system needs to be tested for air tightness and the pressure of each tank group is detected, the adjusting rod 11 of the gas pressure reducing valve is pressed to compress the pressure spring 9, push the piston 7 to open the shunt valve assembly 3, and the inlet gas flows to the outlet. When the outlet pressure reaches the required test pressure of the system, the shunt valve assembly 3 and the housing 5 are gradually closed under the action of the inlet gas pressure and the elastic force of the return spring 2, and the outlet pressure remains stable. When the outlet gas is consumed, the outlet cavity gas pressure decreases, the force of the gas acting on the piston 7 is less than the spring force of the pressure spring 9, the spring force is pushed through the piston 7 to open the shunt valve assembly 3 again, and the high inlet gas enters the outlet cavity, so that the gas pressure slowly rises to the specified value and is closed. The product repeatedly performs the above operation to keep the output pressure of the product constant within a certain range, realizing the pressure reducing function.

[0040] As shown in Figure 3 When the outlet pressure is higher than the required pressure of the system, the adjusting rod of the return gas pressure reducing valve can be returned to reduce the elastic force of the pressure spring 9, and the piston 7 is pushed upward under the action of the outlet cavity gas pressure, so that the piston 7 and the valve assembly 6 are opened, thereby unloading part of the outlet cavity pressure. When the outlet cavity reaches the required pressure of the system, the gas pressure and the elastic force of the pressure spring 9 are matched and stable again, the piston 7 and the valve assembly 6 are pushed to form a seal again, and the pressure relief is disconnected.

[0041] The above examples are only used to illustrate the technical solutions of the present application, and are not limited. The modifications or equivalent replacements of the technical solutions of the present application made by those skilled in the art are included in the scope of the claims of the present application, as long as they do not deviate from the spirit and scope of the technical solutions of the present application.

Claims

1. An adjustable pressure reducing valve with pressure relief function, characterized by: The linkage integrated structure is composed of an inlet nozzle (1), a reset spring (2), a shunt valve assembly (3), a shell (5), a valve assembly (6), a piston (7), a pressure regulating spring (9), a gland (10), an adjusting rod (11), and an outlet nozzle (13). The shell (5) is internally provided with a reverse Y-shaped channel (5.1). The channel located at the upper portion is connected with the adjusting rod (11). The two channels located at the lower portion are respectively connected with the inlet nozzle (1) and the outlet nozzle (13). The outlet nozzle (13) is sealingly connected with the inner side of the shell (5). The outer side of the inlet nozzle (1) is sealingly connected with the inner side of the shell (5). The inner side of the inlet nozzle (1) is provided with a two-layer stepped inner cavity. The inner diameter close to the inlet is small. The bottom end of the reset spring (2) is in contact with the lower stepped surface (1.1). The upper end of the reset spring (2) is arranged in the annular groove at the lower end of the shunt valve assembly (3). The lower end surface of the shunt valve assembly (3) can abut against the upper stepped surface (1.2) of the inlet nozzle (1). The upper end extension of the shunt valve assembly (3) is fixedly connected with the valve assembly (6). The shunt valve assembly (3) is gap-connected with the inner side of the shell (5). The valve assembly (6) is gap-connected with the inner side of the shell (5). The upper end of the valve assembly (6) is provided with the piston (7). The outer side of the piston (7) is sealingly connected with the inner side of the shell (5). The lower end of the piston (7) is provided with a protrusion one (7.1). The protrusion one (7.1) is provided with a through hole (7.3) along the axial center. The upper end surface of the piston (7) is provided with a groove one (7.2) downward along the axial direction. The groove one (7.2) is communicated with the through hole (7.3). One end of the pressure regulating spring (9) is arranged in the groove one (7.2). The other end of the pressure regulating spring (9) is sleeved on the outer side of the adjusting rod (11). The outer side of the adjusting rod (11) is provided with a convex ring one (11.1). The pressure regulating spring (9) is arranged below the convex ring one (11.1). The adjusting rod (11) is internally provided with a T-shaped channel (11.2). The gland (10) is a hollow columnar structure. The inner side of the gland (10) is provided with a stepped surface (10.1). The upper end surface of the convex ring one (11.1) abuts against the stepped surface (10.1). The outer side of the gland (10) is provided with a convex ring two (10.2). The convex ring two (10.2) abuts against the top end of the shell (5). The outer side of the outlet nozzle (13) is provided with a convex ring three (13.1) abutting against the lower end surface of the shell (5).

2. The pressure-adjustable pressure reducing valve with pressure relief function according to claim 1, characterized in that: The connecting position of the inlet nozzle (1) and the shell (5) is provided with a sealing ring one (4).

3. The pressure-adjustable pressure reducing valve with pressure relief function according to claim 1, characterized in that: The connecting position of the piston (7) and the shell (5) is provided with a sealing ring two (8).

4. The pressure-adjustable pressure reducing valve with pressure relief function according to claim 1, characterized in that: The connecting position of the outlet nozzle (13) and the shell (5) is provided with a sealing ring three (12).

5. The pressure-adjustable pressure reducing valve with pressure relief function according to claim 1, characterized in that: The upper end of the valve assembly (6) is provided with a groove two (6.1) filled with polyether ether ketone and polyimide engineering plastics. The diameter of the groove two (6.1) is greater than the maximum diameter of the protrusion one (7.1).

6. The pressure-adjustable pressure reducing valve with pressure relief function according to claim 1, characterized in that: The top of the shunt valve assembly (3) is provided with a sealing ring (3.1) contacting with the shell (5). The sealing ring (3.1) is made of polyether ether ketone and polyimide engineering plastics.

7. The pressure-adjustable pressure reducing valve with pressure relief function according to claim 6, characterized in that: The housing (5) is provided with two protrusions (5.2) in the form of a conical structure at the contact with the sealing ring (3.1).

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