An adapter assembly for aircraft threadless coupling seal testing

Abstract

The application discloses a switching assembly for sealing test of a threadless connector of an airplane, the outer periphery of the threadless connector is provided with an annular groove, and the switching assembly comprises a switching connector, a limiting screw sleeve, a fixing frame and a locking piece; the switching connector is a hollow pipe with threads on the outer periphery; the switching connector comprises a switching end and a working end; the switching end is connected with the port of the threadless connector to make the switching connector communicate with the threadless connector; the limiting screw sleeve is sleeved on the switching connector and is connected through thread cooperation; the fixing frame comprises at least two fixing pieces which are symmetrically arranged on the outer periphery of the switching connector and the threadless connector at the switching position; the fixing piece is provided with a first end and a second end; the first end is provided with a clamping part which is clamped and matched with the annular groove; the second end is clamped and matched with the limiting screw sleeve to provide an axial pre-tightening force between the switching connector and the threadless connector; and the locking piece is used for providing a radial pre-tightening force of the fixing frame on the switching position. The switching assembly is convenient to install and disassemble, has good universality, good sealing performance and high reliability.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of aircraft maintenance, in particular to the technical field of aircraft maintenance test components, and specifically relates to a switching assembly for sealing test of aircraft threadless connection nozzle. BACKGROUND

[0002] The external connection joint of aircraft fuel system, cold gas system and other accessories is a threadless connection nozzle, and the material of the nozzle is an aluminum alloy pipe joint, which has defects such as easy deformation and easy cracking. The forms of the nozzle include a groove type nozzle and a boss type nozzle. Since the accessory cannot be directly connected with the ground test equipment when it is detected after being removed, a switching clamp needs to be designed, which can ensure reliable connection, does not damage the accessory pipe joint, and ensures that the test medium is not leaked and has good sealing performance.

[0003] The existing threadless nozzle switching clamp is basically used in the civil field, and is basically connected with a high hardness or stainless steel pipe. The connection method is simple, and generally a sleeving end of a threadless connection nozzle is sleeved on the end of the threadless connection nozzle, and a sleeve fixed on the threadless connection nozzle is used to press the sleeving end. The sleeving end of the switching nozzle is embedded in the non-fixed end of the sleeve, the sleeve can be pressed tightly on the threadless connection nozzle and form a certain indentation, so that the threaded connection nozzle and the threadless connection nozzle are connected by a nut. The disadvantage of this technology is that the application range is small, the material requirements for the threadless connection nozzle are high, and the pipe wall is generally thick. However, the pipe wall of the accessory nozzle of the military aircraft is generally about 1mm, and the pipe wall of some nozzles is even less than 1mm. The material is relatively fragile, and the clamping force of the switching clamp is too large to cause deformation or even cracking. The nozzle is directly connected with the accessory, and once damaged, it may cause the risk of scrapping the accessory. Therefore, the switching clamp of the prior art cannot be universally applied to the switching requirements of the aircraft accessory nozzle in different fields. SUMMARY

[0004] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide a switching assembly for sealing test of aircraft threadless connection nozzle, which has wide applicability, good sealing performance and simple operation.

[0005] To solve the above technical problems, the present application adopts the following technical solutions:

[0006] The adapter assembly for sealing test of aircraft threadless connector comprises an adapter connector, a limiting sleeve, a fixing frame and a locking member, the adapter connector is a hollow pipe with threads on the outer periphery, the adapter connector comprises an adapter end and a working end, the adapter end is connected with the port of the threadless connector to make the adapter connector communicate with the threadless connector, the limiting sleeve is sleeved on the adapter connector and is connected through threads, the fixing frame comprises at least two fixing members arranged on the outer periphery of the adapter connector and the threadless connector, the fixing member has a first end and a second end, the first end is provided with a clamping part, the clamping part is clamped and matched with the annular groove on the outer periphery of the threadless connector, the second end is clamped and matched with the limiting sleeve to provide the axial pre-tightening force between the adapter connector and the threadless connector, and the locking member is used to provide the radial pre-tightening force of the fixing frame on the adapter.

[0007] The adapter assembly for sealing test of aircraft threadless connector, preferably, the locking member is an annular locking member, and the annular locking member is used to surround and tightly hold the fixing frame.

[0008] The adapter assembly for sealing test of aircraft threadless connector, preferably, the circumference of the annular locking member is adjustable.

[0009] The adapter assembly for sealing test of aircraft threadless connector, preferably, the annular locking member is a clamp.

[0010] The adapter assembly for sealing test of aircraft threadless connector, preferably, the cross sections of the fixing members are the same.

[0011] The adapter assembly for sealing test of aircraft threadless connector, preferably, at least two pin rods are arranged on the outer periphery of the limiting sleeve in the radial direction, the fixing member is respectively provided with a pin hole, and the fixing member is clamped and matched with the limiting sleeve through the pin rods and the pin holes.

[0012] The adapter assembly for sealing test of aircraft threadless connector, preferably, a wrench clamping part is arranged on the outer periphery between the working end and the limiting sleeve.

[0013] The adapter assembly for sealing test of aircraft threadless connector, preferably, the fixing member is a semi-cylindrical shell, the fixing frame is a cylindrical shell formed by buckling two semi-cylindrical shells, and the clamping part is an annular bending part on the bottom surface of the semi-cylindrical shell.

[0014] The adapter assembly for sealing test of aircraft threadless connector, preferably, when the outer diameter of the adapter end is equal to the outer diameter of the port of the threadless connector, the outer periphery of the adapter end and the port of the threadless connector is attached to the inner wall of the fixing frame after the adapter is installed.

[0015] The adapter assembly for sealing test of the aircraft threadless connector, preferably, when the outer diameter of the adapter end is larger than the outer diameter of the port of the threadless connector, the outer periphery of the adapter end is in contact with the inner wall of the fixing frame after the adapter is installed, and there is a gap between the outer periphery of the port of the threadless connector and the inner wall of the fixing frame.

[0016] The adapter assembly for sealing test of the aircraft threadless connector, preferably, when the outer diameter of the adapter end is smaller than the outer diameter of the port of the threadless connector, there is a gap between the outer periphery of the adapter end and the inner wall of the fixing frame after the adapter is installed, and the outer periphery of the port of the threadless connector is in contact with the inner wall of the fixing frame.

[0017] The adapter assembly for sealing test of the aircraft threadless connector, preferably, a sealing washer is arranged at the joint of the adapter end and the port of the threadless connector.

[0018] The adapter assembly for sealing test of the aircraft threadless connector, preferably, the inner diameter of the adapter end is 5mm, and the outer diameter of the adapter end is 32mm.

[0019] Compared with the prior art, the adapter assembly for sealing test of the aircraft threadless connector has the following advantages:

[0020] (1) The adapter assembly for sealing test of the aircraft threadless connector can simultaneously apply appropriate axial pre-tightening force and radial pre-tightening force to the joint of the adapter connector and the threadless connector through the cooperation of the fixing frame, the limiting screw sleeve and the locking member, so as to tightly install the adapter connector on the threadless connector. From the radial direction, the fixing frame clamps the joint of the adapter connector and the threadless connector in the circumferential direction, and the locking member increases the radial pre-tightening force of each fixing member to the joint; from the axial direction, the fixing frame is located between the limiting screw sleeve and the annular groove, and the limiting screw sleeve is threadedly connected with the adapter connector, the axial pre-tightening force between the adapter connector and the threadless connector can be adjusted by rotating and adjusting the position of the limiting screw sleeve on the adapter connector, and the limiting screw sleeve can prevent the adapter connector from being pushed out during the test, so that the adapter assembly of the application is not only convenient to install and disassemble, but also has good sealing performance after the adapter is connected, and has high reliability. The adapter assembly of the application solves the problem that the sealing test of the current groove type threadless connector accessory is difficult to implement and oil leakage occurs during pressure test.

[0021] (2) The limiting screw sleeve and the annular recess in the adapter assembly of the present application make the adapter mouth closely fit the threadless mouth, when the axial pre-tightening force is sufficient, the inner wall of the fixing frame can not completely fit the outer periphery of the adapter end of the adapter mouth or the port of the threadless mouth, that is, the diameter of the adapter end of the adapter mouth and the port of the threadless mouth can not be equal when the adapter assembly of the present application is used, and a certain size difference is allowed, which will not affect the reliability of the adapter. Therefore, by collecting and analyzing the sizes of different threadless mouths, the adapter mouth of appropriate size is selected, and when the sealing test is carried out, the size of the adapter mouth does not need to be measured again, and only the fixing frame (the clamping part of the first end of the fixing member is matched with the annular recess) matched with the threadless mouth needs to be selected to realize the adapter installation, that is, one set of adapter assembly of the present application can adapt to threadless mouths of different sizes, thereby greatly reducing the time for selecting the adapter assembly, shortening the time for the sealing test, and improving the test efficiency.

[0022] (3) The adapter assembly of the present application has the cooperation of the radial force and the axial force, and the axial pre-tightening force is provided by the adjustable threaded cooperation, so that the size of the pre-tightening force is easy to grasp, and the problems of easy deformation and easy crack of the threadless adapter mouth of the thin-walled pipe such as aluminum alloy can be well solved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is the assembly schematic diagram of the adapter assembly for the sealing test of the threadless mouth of the aircraft of the present application Figure 1 .

[0024] Figure 2 is the split schematic diagram of the adapter assembly for the sealing test of the threadless mouth of the aircraft of the present application

[0025] Figure 3 is the assembly schematic diagram of the adapter assembly for the sealing test of the threadless mouth of the aircraft of the present application Figure 2 .

[0026] Figure 4 is the assembly schematic diagram of the adapter assembly for the sealing test of the threadless mouth of the aircraft of the present application Figure 3 .

[0027] LEGEND:

[0028] 1, threadless mouth; 11, annular recess; 2, adapter mouth; 21, adapter end; 22, working end; 3, limiting screw sleeve; 31, pin rod; 4, fixing frame; 41, fixing member; 411, first end; 4111, clamping part; 412, second end; 4121, pin hole; 5, locking member; 6, sealing washer; 7, wrench clamping part. DETAILED DESCRIPTION

[0029] The present application will be further described in detail below in combination with specific embodiments and drawings.

[0030] As shown in Figure 1 and Figure 2 , the present embodiment is used for the adapter assembly of the aircraft threadless connection nozzle sealing test, which comprises an adapter nozzle 2, a limiting sleeve 3, a fixing frame 4 and a locking piece 5. The adapter nozzle 2 is a hollow pipe with threads on the outer periphery. The adapter nozzle 2 comprises an adapter end 21 and a working end 22. The adapter end 21 is connected with the port of the threadless connection nozzle 1 to make the adapter nozzle 2 communicate with the threadless connection nozzle 1. The limiting sleeve 3 is sleeved on the adapter nozzle 2 and is connected through threads. The fixing frame 4 comprises two fixing pieces 41 arranged on the outer periphery of the adapter nozzle 2. The fixing piece 41 has a first end 411 and a second end 412. The first end 411 is provided with a clamping part 4111. The clamping part 4111 is clamped and matched with the annular groove 11 on the outer periphery of the threadless connection nozzle 1. The second end 412 is clamped and matched with the outer periphery of the limiting sleeve 3 to provide the axial pre-tightening force between the adapter nozzle 2 and the threadless connection nozzle 1. The locking piece 5 is used to provide the radial pre-tightening force of the fixing frame 4 to the adapter.

[0031] In use, the working end 22 of the adapter nozzle 2 is first passed through the limiting sleeve 3 to make the limiting sleeve 3 sleeved on the adapter nozzle 2. Then, the adapter end 21 of the adapter nozzle 2 is abutted with the port of the threadless connection nozzle 1 and is aligned with the shaft. The two fixing pieces 41 are arranged on both sides of the adapter nozzle 2 and are located between the clamping sleeve 3 and the annular groove 11. Since the limiting sleeve 3 and the adapter nozzle 2 are connected through threads, the position of the limiting sleeve 3 on the adapter nozzle 2 is adjusted by rotating. Then, the two fixing pieces 41 are tightly arranged on both sides of the adapter nozzle 2 and are located between the clamping sleeve 3 and the annular groove 11. Thus, the adapter nozzle 2 is reliably connected on the threadless connection nozzle 1 to realize the adapter. The limiting sleeve 3 can prevent the adapter nozzle 2 from being ejected during the test, thereby improving the reliability of the adapter assembly. By collecting and analyzing the sizes of different threadless connection nozzles 1, the adapter nozzle 2 is designed with appropriate size. During the sealing test, the size of the adapter nozzle 2 does not need to be measured. Only the fixing frame 4 (the clamping part 4111 of the first end 411 of the fixing piece 41 is matched with the annular groove 11) matched with the threadless connection nozzle 1 needs to be selected to realize the adapter installation. Thus, the time for selecting the adapter assembly is greatly reduced, the time for the sealing test is shortened, and the test efficiency is improved.

[0032] When the outer diameter of the adapter end 21 of the adapter nozzle 2 is equal to the outer diameter of the port of the threadless connection nozzle 1, the outer periphery of the adapter end 21 and the port of the threadless connection nozzle 1 is abutted with the inner wall of the fixing frame 4 after the adapter installation, as shown in Figure 1 , the reliability of the adapter is high.

[0033] When the outer diameter of the adapter end 21 of the adapter nozzle 2 is greater than the outer diameter of the port of the threadless connection nozzle 1, the outer periphery of the adapter end 21 is abutted with the inner wall of the fixing frame 4 after the adapter installation, and there is a gap between the outer periphery of the port of the threadless connection nozzle 1 and the inner wall of the fixing frame 4, as shown in Figure 3As shown in A of FIG. 1, since the adapter is simultaneously subjected to the radial and axial pre-tightening force, even if the outer periphery of the adapter does not fit the inner wall of the fixed frame 4, the reliability after the adapter is not affected.

[0034] When the outer diameter of the adapter end 21 of the adapter nozzle 2 is smaller than the outer diameter of the port of the threadless nozzle 1, there is a gap between the outer periphery of the adapter end 21 after the adapter is installed and the inner wall of the fixed frame 4, as shown in B of FIG. 1, and the outer periphery of the port of the threadless nozzle 1 fits the inner wall of the fixed frame 4. Since the adapter is simultaneously subjected to the radial and axial pre-tightening force, even if the outer periphery of the adapter does not fit the inner wall of the fixed frame 4, the reliability after the adapter is not affected. Figure 3

[0035] In view of the fact that the sizes of the threadless nozzles 1 are different in actual work and the pressures in the communication pipeline are the same for different pipe diameters, the adapter nozzle 2 is designed according to the threadless nozzle 1 with the largest size encountered at present in the embodiment, the outer diameter of the adapter end of the adapter nozzle 2 is set to 32 mm, and the inner diameter of the adapter nozzle 2 is set to 5 mm, so that all sizes of the groove type threadless nozzles can be compatible, the groove type threadless nozzles with different sizes of the aircraft accessories are uniformly output in size through the adapter nozzle 2, the design of the adapter assembly is greatly optimized, the time for selecting the adapter assembly is reduced, and the assembly is simple and easy to operate.

[0036] Since the clamping part 4111 of the first end 411 of the fixing part 41 needs to be clamped and matched with the annular groove 11, five sets of fixing frames 41 with different sizes are designed according to five commonly used threadless nozzles with different sizes in the embodiment, so that only the fixing frame 41 needs to be replaced, and one set of the adapter assembly in the embodiment can meet the adapter requirements of the threadless nozzles with different sizes.

[0037] In the embodiment, the locking part 5 is an annular locking part, which is used to surround and tightly hold the two fixing parts 41 and provide the radial pre-tightening force between the two fixing parts 41 and the threadless nozzle 1, so that the fixing of the adapter nozzle 2 is more reliable, and the circumference of the annular locking part can be adaptively adjusted according to the outer circumference of the fixed frame.

[0038] In the embodiment, the annular locking part is a clamp.

[0039] Of course, in other embodiments, the locking part 5 can also be other parts capable of locking the fixing part, for example, a lock, and the fixed part and the movable part of the lock are fixed on the two fixing parts and cooperate with each other (not shown in the figure).

[0040] In the embodiment, the cross sections of the fixing parts are the same, that is, the fixing parts are symmetrical relative to the central axis of the fixed frame, which is beneficial to making the adapter be subjected to uniform force during fixing.

[0041] ​In this embodiment, the outer periphery of the limiting screw 3 is radially provided with two pin rods 31, and the two fixing members 41 are respectively provided with pin holes 42. The fixing member 41 is clamped and matched with the limiting screw 3 through the pin rod 31 and the pin hole 42. In use, the limiting screw 3 is sleeved on the adapter mouth 2, then the two pin rods 31 are respectively inserted through the pin holes 42 on the fixing member 41, the first end 411 of the fixing member 41 is clamped and matched with the annular groove 11, the adapter end 21 of the adapter mouth 2, the sealing gasket 6 and the port of the threadless adapter mouth 1 are sequentially and tightly matched and aligned with the shaft, the position of the limiting screw 3 on the adapter mouth 2 is adjusted by rotation, so that the adapter mouth 2, the sealing gasket 6 and the threadless adapter mouth 1 are tightly matched, and finally the two fixing members 41 are locked from the outer periphery by the clamp, thereby further improving the reliability of the adapter assembly.

[0042] In this embodiment, the outer periphery of the adapter mouth 2 between the working end 22 and the limiting screw 3 is provided with a wrench clamping part 7. The wrench clamping part 7 makes it more convenient and fast to adjust the position of the limiting screw 3 on the adapter mouth 2 by rotation, and the wrench clamping part 7 also facilitates the connection of the adapter mouth 2 and the test conduit during tightening test.

[0043] In this embodiment, the fixing member 41 is a semi-cylindrical shell, the fixing frame 4 is a cylindrical shell formed by buckling two semi-cylindrical shells, and the clamping part 4111 is an annular bending part located on the bottom surface of the semi-cylindrical shell. When assembling, the two semi-cylindrical shells are buckled into a cylindrical shell from the two sides of the adapter mouth 2 and the threadless adapter mouth 1 at the adapter, which is the fixing frame 4 of this embodiment. The fixing frame 4 has a firm and stable structure.

[0044] In this embodiment, the adapter end 21 and the port of the threadless adapter mouth 1 are provided with a sealing gasket 6. The sealing gasket 6 has elasticity, and the elastic sealing gasket, specifically a sealing rubber ring, is arranged between the adapter end 21 of the adapter mouth 2 and the port of the threadless adapter mouth 1. As a buffer and a seal, the sealing gasket 6 can improve the sealing performance of the adapter and reduce the risk of damage of the hard connection.

[0045] The adapter assembly of this embodiment can be widely used in the threadless adapter mouth of the hydraulic refrigeration system. The threadless adapter mouth is connected to the test equipment by the adapter assembly of this embodiment for sealing performance test. When the applied test pressure is ≤1.2 MPa, the radial tightening force applied during installation of the adapter assembly is (20±2) N.m, which is a key data obtained from multiple test data to ensure that the adapter assembly does not leak oil after assembly and has good sealing performance.

[0046] The above are only preferred embodiments of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments. The technical features involved in the above-described various embodiments of the present application can be combined with each other as long as they do not conflict with each other, and any technical scheme falling within the concept of the present application falls within the protection scope of the present application. It should be noted that, for ordinary skilled persons in the art, some improvements and refinements without departing from the principles of the present application should be considered as the protection scope of the present application.

Claims

1. An adapter assembly for use in a seal test of a threadless coupling nose of an aircraft, characterized in that The utility model provides a connecting mouth (2), limit the screw bush (3), fixed frame (4) and locking piece (5), the connecting mouth (2) is the hollow pipe of the outer periphery clothed with thread, the connecting mouth (2) includes the connecting end (21) and work end (22), the connecting end (21) with the port of screwless mouth (1) butt joint makes the connecting mouth (2) with screwless mouth (1) intercommunication, the limit screw bush (3) is set up on the connecting mouth (2) and is passed through the thread cooperation, the fixed frame (4) includes at least two fixed pieces (41) of setting in the outer periphery of the connecting mouth (2) with the connecting of screwless mouth (1), the fixed piece (41) has first end (411) and second end (412), be equipped with the clamping portion (4111) on the first end (411), the clamping portion (4111) with the annular groove (11) of screwless mouth (1) clamping cooperation, the second end (412) with limit screw bush (3) clamping cooperation to provide the axial pre-tightening force between the connecting mouth (2) with screwless mouth (1), the locking piece (5) is used to provide the radial pre-tightening force of fixed frame (4) to the connecting, the locking piece (5) is annular locking piece, the annular locking piece is used to surround and hold fixed frame (4), the circumference of annular locking piece (5) is adjustable, the connecting end (21) with the port butt joint of screwless mouth (1) is equipped with sealing washer (6), the radial of the outer periphery of limit screw bush (3) is equipped with at least two pin rods (31), the fixed piece (41) is equipped with pin hole (4121) respectively, the fixed piece (41) with limit screw bush (3) are clamped together through pin rod (31) and pin hole (4121) clamping cooperation.

2. The adapter assembly for sealing test of aircraft threadless coupling nose according to claim 1, characterized in that, The cross section of each fixed piece (41) is the same.

3. The adapter assembly for sealing testing of a threadless aircraft coupling nose according to claim 1 or 2, characterized in that A wrench clamping portion (7) is arranged on the outer periphery of the connecting mouth between the connecting end (21) and the limit screw bush (3).

4. The adapter assembly for sealing testing of a threadless aircraft coupling nose according to claim 1 or 2, characterized in that The fixed piece (41) is a semi-cylindrical shell, the fixed frame (4) is a cylindrical shell formed by buckling two semi-cylindrical shells, and the clamping portion (4111) is an annular bending portion on the bottom surface of the semi-cylindrical shell.

5. The adapter assembly for sealing testing of a threadless aircraft coupling nose of claim 1 or 2, wherein, When the outer diameter of the connecting end (21) is equal to the outer diameter of the port of the screwless mouth (1), the outer periphery of the connecting end (21) and the port of the screwless mouth (1) is attached to the inner wall of the fixed frame (4) after the connecting installation.

6. The adapter assembly for sealing testing of aircraft threadless nosepiece according to claim 1 or 2, characterized in that, When the outer diameter of the connecting end (21) is greater than the outer diameter of the port of the screwless mouth (1), the outer periphery of the connecting end (21) is attached to the inner wall of the fixed frame (4), and there is a gap between the outer periphery of the port of the screwless mouth (1) and the inner wall of the fixed frame (4) after the connecting installation. Or, when the outer diameter of the connecting end (21) is less than the outer diameter of the port of the screwless mouth (1), there is a gap between the outer periphery of the connecting end (21) and the inner wall of the fixed frame (4), and the outer periphery of the port of the screwless mouth (1) is attached to the inner wall of the fixed frame (4) after the connecting installation.

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