A special sealing test tooling for the aircraft pressure regulating valve

Abstract

The present invention provides a special sealing test tooling for an aircraft pressure regulating valve, which can realize the connection between the air inlet of the pressure regulating valve and the pipe nozzle of the test bench, and also ensure the seal at the connection between the test piece and the adapter tooling. The special test adapter tooling of the present invention solves the problem of connecting the pressure regulating valve with the pipe nozzle of the pneumatic test bench. It uses a connection method of installing a rubber plug with a long screw with a pipe nozzle to connect the pipe nozzle of the test bench with the air inlet of the pressure regulating valve, and uses the method of squeezing the rubber plug to expand and deform with a fastening nut to ensure the seal at the connection; a movable block combination is designed to prevent injury caused by ejection when the inflation pressure is too high or the tooling is not properly installed.

Description

Technical Field

[0001] The present invention relates to the technical field of aviation equipment repair, and particularly relates to a special sealing test tooling for an aircraft pressure regulating valve. Background Art

[0002] According to the overhaul technical requirements of a certain type of aircraft, during the repair process of the pressure regulating valve, air pressure needs to be introduced into the product through two air inlets to adjust the valve opening pressure and check the tightness of the connection. However, due to the special shapes of the two air inlets A and B of the pressure regulating valve, which are straight pipes with inner diameters of Ф40 and Ф60, as shown in Figure 1 shown, there are no threads and they do not meet the connection requirements of standard quick-release joints. Conventional threaded connection hoses, adapters, or snap-type quick-release joints cannot be connected to them.

[0003] For conventional test products, the air inlets and the test bench pipe connectors are mostly connected by hoses with internal threads, external threads, or snap-type quick-release joints. This type of connection method is suitable for products with threaded air inlets or designed according to the standard quick-release joint dimensions, and is not suitable for products with special-shaped inlets and outlets. Summary of the Invention

[0004] In view of this, the present invention provides a special sealing test tooling for an aircraft pressure regulating valve, which can realize the connection between the air inlet of the pressure regulating valve and the test bench pipe nozzle, and also ensure the seal at the connection between the test piece and the adapter tooling.

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

[0006] A special sealing test tooling for an aircraft pressure regulating valve includes a bushing, a rubber plug, a block, a screw, a cover plate, a fixing member, a push plug, a fastening nut, and a screw rod with a nozzle; among them, the block, the screw, the cover plate, the fixing member, and the push plug form a movable block combination. The push plug is screwed onto the fixing member. The conical surface of the push plug is a deformed wedge surface, which fits with the wedge surface of the same angle of the block. When the push plug is screwed in, the conical surface advances and squeezes the block fixed between the cover plate and the fixing member, causing the block to move outwards and protrude from the cylindrical surface of the fixing member. When the push plug is screwed out, the block is retracted into the cylindrical surface of the fixing member. The screw serves to fix the cover plate and also guides the block.

[0007] The fastening nut, the movable block combination, the bushing, and the rubber plug are sequentially installed on the screw rod with a nozzle. The nozzle of the screw rod is connected to the test bench nozzle; the bushing and the rubber plug ensure the seal at the connection between the adapter tooling and the straight pipe air inlet of the pressure regulating valve; when the fastening nut is tightened, the rubber plug is squeezed, causing it to expand and deform under force to ensure the seal at the connection.

[0008] Among them, it further includes a plug and a sealing gasket. A through hole is opened in the inner cavity of the screw rod with a nozzle, and it is tightened with the plug equipped with the sealing gasket.

[0009] Among them, the movable block combination fixes the test adapter tooling by using 4 notches on the air inlet of the pressure regulating valve.

[0010] Among them, the outer surfaces of the push plug and the fastening nut are in the form of uniformly opened round holes.

[0011] Among them, the rubber plug is designed according to the diameter size of the air inlet of the straight pipe of the pressure regulating valve, and the inner diameter is a hollow structure with a variable diameter.

[0012] Among them, the end face of the screw rod is turned flat and ground smoothly.

[0013] Beneficial effects:

[0014] 1. The special test adapter tooling of the present invention solves the problem of connecting the pressure regulating valve with the nozzle of the pneumatic test bench. The adapter method of installing the rubber plug with a long screw rod with a nozzle is used to connect the nozzle of the test bench with the air inlet of the pressure regulating valve, and the method of squeezing the rubber plug to expand and deform by the fastening nut is used to ensure the seal at the connection; the movable block combination is designed to prevent injury caused by popping out when the inflation pressure is too high or the tooling is not installed properly.

[0015] 2. The inner diameter of the rubber plug in the present invention is processed into a cavity variable diameter structure in the middle, which is convenient for controlling the extrusion and expansion deformation part of the rubber plug and is beneficial to ensuring the seal.

[0016] 3. In the movable block combination of the test adapter tooling of the present invention, based on the principle of mutual extrusion and pushing of the contact surface forces of the wedge-shaped parts, the block can be pushed into the 4 notches of the air inlet by screwing in the push plug, ensuring a firm connection between the adapter tooling and the test piece. This design is not only safe and reliable but also ingenious.

[0017] 4. The outer circles of the push plug and the fastening nut in the present invention are changed from the conventional knurled or hexagonal form to the form of uniformly opened round holes, and the design of uniformly opening eight round holes is convenient for applying force during the installation process of the tooling with a round rod or a screwdriver. Description of the drawings

[0018] Figure 1 It is a schematic diagram of the air inlet of the pressure regulating valve to be sealed in the present invention;

[0019] Figure 2 It is a schematic diagram of the structure of the adapter tooling in the present invention;

[0020] Figure 3 It is a schematic diagram of the screw rod with a nozzle in the present invention;

[0021] Figure 4 It is a schematic diagram of the rubber plug in the present invention;

[0022] Figure 5 It is a schematic diagram of the movable block combination in the present invention;

[0023] Figure 6Schematic diagram of the driving plug conical surface of the present invention;

[0024] Figure 7 Schematic diagram of the clamping block of the present invention.

[0025] Wherein, 1 - plug, 2 - gasket, 3 - bushing, 4 - rubber plug, 5 - clamping block, 6 - screw, 7 - cover plate, 8 - fixing piece, 9 - driving plug, 10 - fastening nut, 11 - screw rod with a nozzle. Specific embodiments

[0026] The present invention will be described in detail below with reference to the accompanying drawings and by way of examples.

[0027] Generally, the test transfer tooling uses internal threads, external threads or snap - type quick - release connectors for conversion connections, which is not suitable for the pressure - regulating valve with a straight - through pipe intake port. In the present invention, a transfer method of installing a rubber plug with a long screw rod with a nozzle deformed from a straight - through pipe joint is adopted, which not only realizes the connection between the intake port of the pressure - regulating valve and the test bench nozzle, but also ensures the seal at the connection between the test piece and the transfer tooling.

[0028] After comprehensively considering the structure of the straight - through pipe intake port of the pressure - regulating valve and the product test pressure, the present invention designs two sets of test transfer toolings with the same structure but different sizes, as shown in the schematic Figure 2 . The special test transfer tooling for the pressure - regulating valve includes a plug 1, a gasket 2, a bushing 3, a rubber plug 4, a clamping block 5, a screw 6, a cover plate 7, a fixing piece 8, a driving plug 9, a fastening nut 10 and a screw rod 11 with a nozzle. Among them, a rubber plug 4 is installed on the long screw rod 11 with a nozzle to realize the transfer and seal at the connection between the intake port of the pressure - regulating valve and the test bench nozzle. To prevent the rubber plug from deforming and having insufficient frictional force after pressurization, which may cause the tooling to pop out and hurt people, a movable clamping block combination is designed to fix the test transfer tooling using the 4 notches on the intake port of the pressure - regulating valve.

[0029] The assembly position relationship between the various parts of the test transfer tooling for the pressure - regulating valve is as Figure 2As shown, the fastening nut 10, the movable block assembly, the bushing 3, and the rubber plug 4 are sequentially installed on the screw 11 with the pipe nozzle, and finally the plug 1 equipped with the sealing gasket 2 is tightened on the end face of the screw. When the adapter is in use, the adapter is first installed on the air inlet of the straight-through pipe of the pressure regulating valve, and the block 5 is pushed out of the fixing part 8 into the four slots of the air inlet of the pressure regulating valve by tightening the push screw plug 9; secondly, the rubber plug 4 is squeezed by tightening the fastening nut 10 to expand and deform to seal the air inlet of the pressure regulating valve; finally, the pipe nozzle of the screw 11 with the pipe nozzle is connected to the pipe nozzle of the test bench by a connecting hose, and the air is ventilated inside the pressure regulating valve for testing. The present invention solves the problem that the air inlet of the straight-through pipe cannot be connected to the pipe nozzle of the test bench by installing the rubber plug on the long screw with the pipe nozzle. Furthermore, in this embodiment, eight circular holes are evenly opened on the outer circle of the push screw plug and the fastening nut, which is convenient for installation with a mounting rod.

[0030] In the present invention, the air inlet of the straight-through pipe of the pressure regulating valve is connected to the pipe joint of the test bench, and the sealing of the connection is ensured. At the same time, because the air inlet is a straight-through pipe, there is no place to fix the adapter tool after the connection, and the firmness of the connection must also be considered during the design to prevent the tool from popping out and injuring people due to excessive inflation pressure or improper installation. Specifically including:

[0031] 1) Screw 11 with nozzle, such as Figure 3 As shown, the design is based on the straight-through pipe joint, with the pipe joint structure retained at one end and the other end deformed into a long straight screw to facilitate the installation of a rubber plug 4, a movable block assembly and a fastening nut 10. The end face of the screw is flattened and polished to be smooth, and is tightened and sealed with a plug 1 equipped with a sealing gasket 2, and a through hole is opened in the inner cavity of the screw to achieve ventilation and pressurization of the air inlet of the pressure regulating valve.

[0032] 2) Activity card combination, such as Figure 5 As shown, the design basis is that the contact surface forces of the wedge-shaped parts squeeze and push each other, and the conical surface of the push screw plug 9 screwed on the fixing part 8 is a deformed wedge-shaped surface, such as Figure 6 As shown, it fits with the wedge-shaped surface of the same angle of the block 5, and the block 5 is as shown in FIG. Figure 7 As shown. When the push screw plug 9 is screwed in, the conical surface pushes and squeezes the block 5 fixed between the cover plate 7 and the fixing member 8, so that the block 5 moves outward and protrudes from the cylindrical surface of the fixing member 8. When the push screw plug 9 is screwed out, the force of the conical surface separating from the wedge surface of the block 5 disappears, and the block 5 can be put into the cylindrical surface of the fixing member 8. The screw 6 not only fixes the cover plate 7, but also guides the block 5. The movable block combination design in the present invention uses the method of using the block bevel and the push screw plug conical surface to fit at the same angle, and the thread is screwed in to push the block to move, so as to ensure the fixation of the test adapter after installation.

[0033] 3) Rubber plug 4, such as Figure 4As shown in the figure, it is designed according to the diameter size of the air inlet of the direct pipe of the pressure regulating valve, and the inner diameter is designed as a hollow structure with variable diameter, which is convenient for controlling the expansion and deformation part during the process of applying force. In the present invention, the rubber plug is designed with a cavity processed in the middle of the inner diameter, which is convenient for the expansion and deformation during the process of applying force to the fastening nut, and is beneficial to sealing.

[0034] 4) Push the outer cylindrical surfaces of the plug 9 and the fastening nut 10, and change the conventional knurling or hexagonal form to a form of evenly opening round holes. This design form is convenient for using a round bar or a screwdriver to insert into the round holes to apply force and tighten the thread during the installation of the tooling.

[0035] The various parts of the test transfer tooling for the pressure regulating valve form four functional areas:

[0036] 1) The plug 1, the gasket 2 and the screw rod 11 with a nozzle are the main connecting parts, and their function is to connect the various parts and connect with the test bench nozzle through the nozzle of the screw rod to increase the pressure;

[0037] 2) The rubber plug 4 and the bushing 3 are the sealing parts of the tooling, and their function is to ensure the seal at the connection between the transfer tooling and the air inlet of the direct pipe of the pressure regulating valve through the expansion and deformation of the rubber plug under the extrusion force;

[0038] 3) The block 5, the screw 6, the cover plate 7, the fixing part 8 and the push plug 9 form a movable block combination, as Figure 5 shown in the figure, and its function is to fix through the 4 notches of the air inlet of the pressure regulating valve by pushing the block 5, so as to prevent the tooling from popping out and hurting people when pressurizing;

[0039] 4) The fastening nut 10 is a force-applying component, and its function is to screw the fastening nut 10 tightly on the screw rod to extrude the rubber plug, so that it expands and deforms under force to ensure the seal at the connection.

[0040] The assembly position relationship between the various parts is to sequentially install the fastening nut 10, the movable block combination, the bushing 3, and the rubber plug 4 on the screw rod 11 with a nozzle, and finally tighten with the plug 1 equipped with the gasket 2. When the transfer tooling is in use, first install the tooling on the air inlet of the direct pipe of the pressure regulating valve, push the block 5 out of the fixing part 8 through the screw-in push plug 9 and into the 4 notches of the air inlet; secondly, squeeze the rubber plug 4 by screwing the fastening nut 10 tightly, so that it expands and deforms to seal the air inlet of the pressure regulating valve; finally, connect the nozzle of the screw rod 11 with the nozzle of the test bench with a connecting hose to conduct an air ventilation test inside the pressure regulating valve.

[0041] In the present invention, the movable block combination utilizes the conical surface of the push plug 9 (see Figure 6 ) and the inclined surface of the block 5 (see Figure 7)The characteristic of fitting at the same angle. During the process of screwing in the push plug 9, the conical surface moves downward to push the block 5 clamped between the cover plate 7 and the fixing member 8 to move outward. The screw 6 not only plays the role of fixing the cover plate but also plays the role of guiding the block. The rubber plug 4 is designed according to the diameter size of the air inlet of the direct-through pipe of the pressure regulating valve, and the middle part of the inner diameter is processed into a cavity, which is convenient for expansion and deformation after applying force; the inside of the screw 11 with a nozzle is provided with a through hole, and finally tightened with the plug 1 equipped with the gasket 2, which not only ensures the seal at the connection but also constitutes an inner hole passage to apply air pressure to the inner cavity of the pressure regulating valve; eight round holes are evenly opened on the outer circles of the push plug 9 and the fastening nut 10, which is convenient for applying force to the adapter tooling with the installation rod for installation.

[0042] In summary, the above is only a preferred embodiment of the present invention and is not used to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A special sealing test tooling for an aircraft pressure regulating valve, characterized in that, it includes a bushing, a rubber plug, a clamping block, a screw, a cover plate, a fixing piece, a push plug, a fastening nut and a screw rod with a nozzle; among them, the clamping block, the screw, the cover plate, the fixing piece and the push plug form a movable clamping block combination. The push plug is screwed onto the fixing piece. The conical surface of the push plug is a deformed wedge surface, which fits with the wedge surface of the same angle of the clamping block. When the push plug is screwed in, the conical surface advances and extrudes the clamping block fixed between the cover plate and the fixing piece, so that the clamping block moves outwards and protrudes from the cylindrical surface of the fixing piece. When the push plug is screwed out, the clamping block is retracted into the cylindrical surface of the fixing piece. The screw plays the role of fixing the cover plate and also guides the clamping block; The fastening nut, the movable clamping block combination, the bushing and the rubber plug are sequentially installed on the screw rod with a nozzle, and the nozzle of the screw rod is connected to the nozzle of the test bench; the bushing and the rubber plug ensure the seal at the connection between the test tooling and the air inlet of the straight pipe of the pressure regulating valve; tightening the fastening nut extrudes the rubber plug, causing it to expand and deform under force to ensure the seal at the connection.

2. The test tooling according to claim 1, characterized in that, it further includes a plug and a gasket. A through hole is opened in the inner cavity of the screw rod with a nozzle, and the inner cavity of the screw rod is tightened with the plug equipped with the gasket.

3. The test tooling according to claim 1 or 2, characterized in that, the movable clamping block combination fixes the test tooling by using 4 notches on the air inlet of the pressure regulating valve.

4. The test tooling according to claim 1 or 2, characterized in that, the outer circular surfaces of the push plug and the fastening nut are in the form of uniformly opened round holes.

5. The test tooling according to claim 1 or 2, characterized in that, the rubber plug is designed according to the diameter size of the air inlet of the straight pipe of the pressure regulating valve, and the inner diameter is a hollow structure with a variable diameter.

6. The test tooling according to claim 1 or 2, characterized in that, the end face of the screw rod is turned flat and ground smoothly.

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