Inflation and deflation device for undercarriage

Abstract

The utility model discloses an undercarriage inflating and deflating device which comprises a shell, an ejector rod, a pressing cap and an end cap, a through middle channel is arranged in the shell, a first air tap and a second air tap are arranged on the shell, the ejector rod is inserted in the middle channel and can move along the middle channel, and a sealing piece is arranged between the top of the ejector rod and the middle channel. An inflation channel is reserved between the bottom of the ejector rod and the middle channel. An upper limiting step A is arranged on the inner side of the pressing cap; an upper limiting step B is arranged on the outer wall of the ejector rod; a lower limiting step A is arranged in the middle channel, and a lower limiting step B is arranged on the outer wall of the ejector rod; the end cap is rotationally installed at the bottom end of the shell and used for being connected with an inflation valve of a workpiece. The shell and the end cap can rotate independently, so that inflation equipment and a pipeline can be reasonably arranged according to site conditions, the structure is simple and compact, the integration degree is high, operation and use are convenient, the performance is stable and reliable, and the functions of inflation and deflation of workpieces and gas pressure detection can be achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of aviation equipment, and in particular relates to a landing gear inflation and deflation device. Background Art

[0002] The landing gear is an important part of the aircraft, used to support the weight of the aircraft, bear the corresponding load, and can consume and absorb the impact energy of the aircraft during landing and taxiing. It has an extremely important mission during the take-off and landing process of the aircraft. The quality of its working performance and the level of its reliability directly affect the usability and safety of the aircraft. At present, most of the domestic helicopter landing gears use inflatable buffer struts. The landing gear drop shock test mainly verifies its ability to absorb the designed landing power and power reserve of the helicopter, and provides a theoretical basis for correcting the inflation parameters of the buffer struts, which is related to the landing safety of the helicopter.

[0003] During the landing gear drop test, each working condition needs to first ensure the filling state of the buffer strut (mainly indicators such as the gas volume and pressure of each air cavity), and during the landing gear drop adjustment parameter test, tolerance test and stiffness and damping test, the gas filling state of the landing gear buffer strut needs to be adjusted multiple times.

[0004] At present, the inflation and deflation devices of the landing gear buffer struts have problems such as complex operation, high work intensity, time-consuming and labor-intensive, and low efficiency. Utility Model Content

[0005] The utility model aims to provide a landing gear inflation and deflation device, which is used to solve the above problems existing in the prior art.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a landing gear inflation and deflation device, comprising a shell, a push rod, a pressure cap and an end cap, wherein a middle passage penetrating the shell is provided inside, and a first air nozzle and a second air nozzle are provided on the shell, wherein the first air nozzle is used to connect a pressure detection instrument, and the second air nozzle is used to connect an inflation device; the push rod is inserted into the middle passage and can move along the middle passage, a sealing member is provided between the top of the push rod and the middle passage, an inflation passage is left between the bottom of the push rod and the middle passage, and the first air nozzle and The second air nozzles are all connected to the inflation channel; the pressure cap is installed at the top of the outer shell and is used to limit the push rod from detaching from the outer shell, an upper limit step A is provided on the inner side of the pressure cap, and an upper limit step B is provided on the outer wall of the push rod to resist the upper limit step A; a lower limit step A is provided inside the middle channel, and a lower limit step B is provided on the outer wall of the push rod to resist the lower limit step A; the end cap is rotatably installed on the bottom end of the outer shell, and the end cap is used to connect the inflation valve of the workpiece, and the bottom end of the push rod can be extended into the end cap to drive the air core of the inflation valve to move, thereby controlling the switch of the inflation valve.

[0007] As an optional implementation of the above technical solution, a driving handle is installed at one end of the push rod away from the end cap.

[0008] As an optional implementation of the above technical solution, the driving handle is sleeved on the top rod, and the top rod is provided with a fixing nut for fixing the driving handle.

[0009] As an optional implementation of the above technical solution, the inner wall of the intermediate channel is provided with an internal thread, and the outer wall of the push rod is provided with an external thread matching the internal thread.

[0010] As an optional implementation of the above technical solution, the sealing member includes a sealing ring, and the outer wall of the push rod is provided with a mounting groove adapted to the sealing ring.

[0011] As an optional implementation of the above technical solution, the end cap is sleeved on the outer shell, and a sealing gasket is provided between the end cap and the outer shell.

[0012] As an optional implementation of the above technical solution, the inner wall of the end cap is provided with a limiting groove adapted to the sealing gasket, one end of the shell abuts against the sealing gasket, and the middle of the sealing gasket is provided with a through hole for the movement of the push rod.

[0013] As an optional implementation of the above technical solution, a plurality of steel balls are arranged between the end cap and the outer shell, the outer wall of the outer shell is provided with a first annular groove, the inner wall of the end cap is provided with a second annular groove, the plurality of steel balls are located between the first annular groove and the second annular groove, and the end cap is provided with an insertion hole adapted to the steel ball, the insertion hole is connected to the second annular groove, and the insertion hole is equipped with a sealing screw.

[0014] As an optional implementation of the above technical solution, the end cap is threadedly connected to the inflation valve of the workpiece, the top of the inflation valve abuts against the sealing gasket, and the air core of the inflation valve abuts against the push rod.

[0015] As an optional implementation of the above technical solution, the pressure cap is threadedly connected to the shell.

[0016] The beneficial effects of the utility model are:

[0017] The outer shell and the end cap of the landing gear inflation and deflation device provided by the utility model can rotate independently, so that the inflation equipment and the pipeline can be reasonably arranged according to the on-site conditions. The utility model has a simple and compact structure, high integration, convenient operation, easy use, stable and reliable performance, and can realize the inflation and deflation of the workpiece and the gas pressure detection function. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a landing gear inflation and deflation device in one embodiment of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the housing in one embodiment of the utility model;

[0020] Figure 3 This is a schematic diagram of the structure of a push rod in one embodiment of the utility model;

[0021] Figure 4 This is a schematic diagram of the structure of an end cap in one embodiment of the utility model;

[0022] Figure 5 It is a structural schematic diagram of an end cap and an inflation valve in one embodiment of the utility model;

[0023] Figure 6 This is a usage state diagram of a landing gear inflation and deflation device in one embodiment of the utility model.

[0024] In the figure: 1-housing; 2-pusher; 3-pressing cap; 4-end cap; 5-first air nozzle; 6-second air nozzle; 7-pressure detection instrument; 8-inflating device; 9-upper limit step B; 10-lower limit step B; 11-inflating valve; 12-driving handle; 13-fixing nut; 14-internal thread; 15-external thread; 16-sealing ring; 17-mounting groove; 18-sealing pad; 19-limiting groove; 20-steel ball; 21-first annular groove; 22-second annular groove; 23-loading hole. DETAILED DESCRIPTION

[0025] like Figure 1-Figure 6 As shown, this embodiment provides a landing gear inflation and deflation device, which is mainly used for inflation and deflation of buffer struts. The landing gear inflation and deflation device comprises a shell 1, a push rod 2, a pressure cap 3 and an end cap 4. The shell 1 is a cylindrical structure, and a middle channel is provided inside the shell 1. The middle channel is arranged along the length direction of the shell 1 and is located in the middle position of the shell 1. A first air nozzle 5 and a second air nozzle 6 are provided on the surface of the shell 1.

[0026] The first gas nozzle 5 and the second gas nozzle 6 are arranged on both sides of the housing 1, and the first gas nozzle 5 and the second gas nozzle 6 are both connected to the middle channel. The first gas nozzle 5 is used to connect the pressure detection instrument 7, and the second gas nozzle 6 is used to connect the inflation device 8. The inflation device 8 is used to fill the buffer pillar with gas, and the pressure detection instrument 7 is used to detect the gas pressure of the buffer pillar. The utility model integrates the pressure detection instrument 7 and the inflation device 8 on the housing 1, and the pressure data is easy to read. In addition, the landing gear drop shock test is simple, efficient and labor-saving.

[0027] The push rod 2 is inserted in the middle channel and can move along the middle channel. The top of the push rod 2 is located outside the middle channel. A seal is provided between the top of the push rod 2 and the middle channel. The seal seals the gap between the push rod 2 and the middle channel. An inflation channel is left between the bottom of the push rod 2 and the middle channel. The first gas nozzle 5 and the second gas nozzle 6 are both connected to the inflation channel. The gas of the inflation device 8 can be transported to the buffer pillar through the inflation channel, and the pressure detection instrument 7 can detect the gas pressure of the buffer pillar.

[0028] The pressure cap 3 is installed at the top of the housing 1 and is used to limit the ejector 2 from separating from the housing 1. The pressure cap 3 is threadedly connected to the housing 1. An upper limit step A is provided inside the pressure cap 3, and an upper limit step B9 is provided on the outer wall of the ejector 2 to resist the upper limit step A; a lower limit step A is provided inside the middle channel, and a lower limit step B10 is provided on the outer wall of the ejector 2 to resist the lower limit step A. The ejector 2 can move along the middle channel. After the ejector 2 moves upward to a suitable position, the upper limit step A resists the upper limit step B9 to prevent the ejector 2 from moving further upward; after the ejector 2 moves downward to a suitable position, the lower limit step A resists the lower limit step B10 to prevent the ejector 2 from moving further downward, so that the stroke of the ejector 2 is kept within a suitable range.

[0029] The end cap 4 is rotatably mounted on the bottom end of the outer shell 1. The end cap 4 is used to connect the inflation valve 11 of the workpiece. The bottom end of the push rod 2 can be inserted into the end cap 4 to drive the air core of the inflation valve 11 to move, thereby controlling the switch of the inflation valve 11. The outer shell 1 can be rotated independently of the end cap 4, so that the inflation device 8 and the pipeline can be reasonably arranged according to the site conditions. When the push rod 2 moves downward, the push rod 2 pushes the air core of the inflation valve 11 to move, and the inflation valve 11 is opened, so that the gas of the inflation device 8 is injected into the buffer pillar through the inflation channel, and the pressure of the injected gas is observed by the pressure detection instrument 7; after the inflation device 8 is removed, the deflation operation can be realized. When the push rod 2 moves upward, the push rod 2 is separated from the inflation valve 11, the inflation valve 11 is closed, and the buffer pillar stops injecting gas.

[0030] The outer shell 1 and the end cap 4 in the landing gear inflation and deflation device provided by the utility model can rotate independently, so that the inflation equipment 8 and the pipeline can be reasonably arranged according to the on-site conditions. The utility model has a simple and compact structure, high integration, convenient operation, easy use, stable and reliable performance, and can realize the inflation and deflation of the workpiece and the gas pressure detection function.

[0031] like Figure 1 As shown, in this embodiment, in order to facilitate the movement of the push rod 2, a driving handle 12 is installed at one end of the push rod 2 away from the end cap 4. Preferably, the driving handle 12 is sleeved on the push rod 2, and a fixing nut 13 for fixing the driving handle 12 is provided on the push rod 2, so as to facilitate the assembly of the driving handle 12.

[0032] like Figure 2 As shown, in one embodiment, the inner wall of the middle channel is provided with an internal thread 14, and the outer wall of the push rod 2 is provided with an external thread 15 adapted to the internal thread 14. The external thread 15 is provided on a portion of the outer wall of the push rod 2, and the internal thread 14 is provided on a portion of the inner wall of the middle channel. The push rod 2 is controlled to rotate by the driving handle 12 to realize the up and down movement of the push rod 2, thereby controlling the opening and closing of the inflation valve 11. Since the push rod 2 is threadedly matched with the housing 1, it is convenient to finely adjust the inflation valve 11.

[0033] like Figure 3 As shown, in one embodiment, the sealing member includes a sealing ring 16, and the outer wall of the push rod 2 is provided with a mounting groove 17 adapted to the sealing ring 16. In order to improve the sealing effect between the push rod 2 and the housing 1, there are two or more sealing rings 16 between the push rod 2 and the housing 1, that is, two or more mounting grooves 17 are provided on the push rod 2.

[0034] like Figure 4 and Figure 5 As shown, in this embodiment, the end cap 4 is sleeved on the outer shell 1, and a sealing gasket 18 is provided between the end cap 4 and the outer shell 1. Specifically, the inner wall of the end cap 4 is provided with a limiting groove 19 adapted to the sealing gasket 18, one end of the outer shell 1 abuts against the sealing gasket 18, and the middle part of the sealing gasket 18 is provided with a through hole for the movement of the push rod 2. After the push rod 2 passes through the through hole, it presses the air core of the inflation valve 11 to move, and controls the switch of the inflation valve 11, so that the gas provided by the inflation device 8 can enter the interior of the buffer pillar after passing through the inflation channel and the through hole. The end cap 4 is threadedly connected to the inflation valve 11 of the workpiece, the top of the inflation valve 11 abuts against the sealing gasket 18, and the air core of the inflation valve 11 abuts against the push rod 2, thereby improving the sealing effect between the end cap 4 and the inflation valve 11.

[0035] Among them, a plurality of steel balls 20 are arranged between the end cap 4 and the housing 1, a first annular groove 21 is arranged on the outer wall of the housing 1, a second annular groove 22 is arranged on the inner wall of the end cap 4, and a plurality of steel balls 20 are located between the first annular groove 21 and the second annular groove 22, so that the end cap 4 and the housing 1 can rotate relative to each other, and the housing 1 and the end cap 4 can rotate to any position independently, so that the arrangement between the field equipment and the pipeline is smooth. The end cap 4 is provided with a loading hole 23 adapted to the steel ball 20, the loading hole 23 is connected with the second annular groove 22, and the loading hole 23 is equipped with a plugging screw. After the steel ball 20 enters between the first annular groove 21 and the second annular groove 22 through the loading hole 23, the loading hole 23 is blocked by the plugging screw, so that the steel ball 20 is kept between the first annular groove 21 and the second annular groove 22, so as to realize the relative rotation function between the end cap 4 and the housing 1.

[0036] like Figure 6 As shown, when the utility model is used, the housing 1, the push rod 2, the pressure cap 3 and the end cap 4 are assembled first, and the first air nozzle 5 and the second air nozzle 6 on the housing 1 are connected to the pressure detection instrument 7 and the inflatable device 8 respectively. By rotating the housing 1, the pipeline on the inflatable device 8 can be arranged smoothly. The housing 1 can be rotated relative to the housing 1 along the track formed by the steel ball 20. The housing 1 is rotated to any suitable position according to the on-site arrangement, so that the arrangement between the on-site equipment and the pipeline is smooth. The inflatable valve 11 is connected, and the inflatable valve 11 presses the sealing gasket 18 tightly, so that the sealing gasket 18 plays a sealing role. By rotating the driving handle 12, the bottom end of the push rod 2 is supported against the air core of the inflatable valve 11, and then the inflatable valve 11 is opened, and the inflation and deflation can be carried out, and the real-time pressure can be obtained through the pressure detection instrument 7. When the inflation and deflation are completed, the push rod 2 is separated from the air core of the inflatable valve 11 by rotating the driving handle 12, and then the inflatable valve 11 is closed.

[0037] In the description of the present utility model, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, and may be fixedly connected, detachably connected, or integrated; may be mechanically connected or electrically connected; may be directly connected or indirectly connected through an intermediate medium, may be the internal connection of two components or the interaction relationship between two components. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood. In addition, the specific features, structures, etc. described in the embodiments are included in at least one embodiment. In the absence of mutual contradictions, those skilled in the art may combine the features of different embodiments. The scope of protection of the present utility model is not limited to the above-mentioned specific embodiments. According to the basic technical concept of the present utility model, the embodiments that can be associated with by ordinary technicians in this field without creative work all belong to the scope of protection of the present utility model.

Claims

1. A landing gear inflation and deflation device, characterized in that: The invention comprises a shell (1), a push rod (2), a pressure cap (3) and an end cap (4); the shell (1) is provided with a middle passage extending therethrough; the shell (1) is provided with a first air nozzle (5) and a second air nozzle (6); the first air nozzle (5) is used to connect a pressure detection instrument (7); the second air nozzle (6) is used to connect an inflatable device (8); the push rod (2) is inserted into the middle passage and can move along the middle passage; a sealing member is provided between the top of the push rod (2) and the middle passage; an inflatable passage is left between the bottom of the push rod (2) and the middle passage; the first air nozzle (5) and the second air nozzle (6) are both connected to the inflatable passage; the pressure cap (3 ) is mounted on the top end of the housing (1) and is used to limit the ejector rod (2) from separating from the housing (1); an upper limit step A is provided on the inner side of the pressure cap (3); an upper limit step B (9) is provided on the outer wall of the ejector rod (2) to abut against the upper limit step A; a lower limit step A is provided inside the intermediate channel; a lower limit step B (10) is provided on the outer wall of the ejector rod (2) to abut against the lower limit step A; the end cap (4) is rotatably mounted on the bottom end of the housing (1); the end cap (4) is used to connect the air valve (11) of the workpiece; the bottom end of the ejector rod (2) can be extended into the end cap (4) to drive the air core of the air valve (11) to move, thereby controlling the switch of the air valve (11).

2. The landing gear inflation and deflation device according to claim 1, characterized in that: A driving handle (12) is installed at one end of the push rod (2) away from the end cap (4).

3. The landing gear inflation and deflation device according to claim 2, characterized in that: The driving handle (12) is sleeved on the top rod (2), and the top rod (2) is provided with a fixing nut (13) for fixing the driving handle (12).

4. The landing gear inflation and deflation device according to claim 1, characterized in that: The inner wall of the intermediate channel is provided with an internal thread (14), and the outer wall of the push rod (2) is provided with an external thread (15) matched with the internal thread (14).

5. The landing gear inflation and deflation device according to claim 1, characterized in that: The sealing element comprises a sealing ring (16), and the outer wall of the push rod (2) is provided with a mounting groove (17) adapted to the sealing ring (16).

6. The landing gear inflation and deflation device according to claim 1, characterized in that: The end cap (4) is sleeved on the outer shell (1), and a sealing gasket (18) is provided between the end cap (4) and the outer shell (1).

7. The landing gear inflation and deflation device according to claim 6, characterized in that: The inner wall of the end cap (4) is provided with a limiting groove (19) adapted to the sealing gasket (18), one end of the housing (1) abuts against the sealing gasket (18), and the middle of the sealing gasket (18) is provided with a through hole for the push rod (2) to move.

8. The landing gear inflation and deflation device according to claim 7, characterized in that: A plurality of steel balls (20) are arranged between the end cap (4) and the outer shell (1); a first annular groove (21) is arranged on the outer wall of the outer shell (1); a second annular groove (22) is arranged on the inner wall of the end cap (4); the plurality of steel balls (20) are located between the first annular groove (21) and the second annular groove (22); a loading hole (23) adapted to the steel balls (20) is arranged on the end cap (4); the loading hole (23) is communicated with the second annular groove (22); and a plugging screw is arranged on the loading hole (23).

9. The landing gear inflation and deflation device according to claim 7, characterized in that: The end cap (4) is threadedly connected to the air-filled valve (11) of the workpiece, the top of the air-filled valve (11) abuts against the sealing pad (18), and the air core of the air-filled valve (11) abuts against the push rod (2).

10. The landing gear inflation and deflation device according to claim 1, characterized in that: The pressing cap (3) is threadedly connected to the outer shell (1).

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