A high-pressure limit piston rod

Abstract

The present invention provides a high-pressure limit piston rod, comprising: a housing, a first limit sleeve, a second limit sleeve, a third limit sleeve, a piston sleeve rod, a piston rod, an oil return control switch, and a limit control switch; each of the two rods, namely the piston rod and the piston sleeve rod, has a moving stroke, and the two moving strokes can ensure that when vector control is required for a moving body, there is sufficient moving space, and can also ensure that when the moving body needs to return to the middle emergently, the movement of the moving body can be stably and reliably restricted, avoiding problems such as insufficient stroke of the moving body or reduced sealing and reliability caused by too long a stroke when only using the moving stroke of one piston rod.

Description

Technical Field

[0001] The present invention belongs to the field of aero-engine control technology, and particularly relates to a high-pressure limit piston rod. Background Art

[0002] When an engine with vector nozzle control is working, when the vector control system fails, the control of the vector nozzle needs to be degraded to the emergency centering control state.

[0003] However, the current centering control device mainly relies on electronic control, requires complex control devices, and has problems such as complex structure and low reliability. Summary of the Invention

[0004] The present invention provides a high-pressure limit piston rod to solve the problems of the complex structure and low reliability of the centering control device in the existing engine with vector nozzle control.

[0005] The present invention provides a high-pressure limit piston rod, including: a housing 5, a first limit sleeve 16, a second limit sleeve 17, a third limit sleeve 18, a piston sleeve rod 10, a piston rod 11, an oil return control switch 14, and a limit control switch 15; wherein,

[0006] The housing 5 is in the shape of a hollow cylinder, with a limit boss provided in the inner cavity at the right end, and the inner cavity is sequentially provided with a first limit sleeve 16, a second limit sleeve 17, and a third limit sleeve 18 from left to right; a first oil passage hole, a second oil passage hole, and a third oil passage hole are sequentially provided on the housing 5 at the right end face close to the first limit sleeve 16, at the left end face of the second limit sleeve 17, and at the left end face of the third limit sleeve 18;

[0007] A piston boss is provided in the middle of the piston rod 11, the rod diameter of the piston rod 11 at the right end of the piston boss is smaller than the rod diameter at the left end of the piston boss, the piston rod 11 is arranged in the housing 5, and the piston boss slides between the first limit sleeve 16 and the second limit sleeve 17; a first control cavity 7 is formed between the left end face of the piston boss and the right end face of the first limit sleeve 16, and the first control cavity 7 is communicated with the control oil through the first oil passage hole; a moving body 12 with vector nozzle control is slidably sleeved outside the right end of the piston rod 11;

[0008] The piston sleeve rod 10 is a hollow rod structure, sleeved on the rod at the right end of the piston boss of the piston rod 11, a sliding boss is provided at the left end of the piston sleeve rod 10, and the sliding boss slides between the second limit sleeve 17 and the third limit sleeve 18; a second control cavity 8 is formed between the right end face of the piston boss and the left end face of the sliding boss, and a third control cavity 9 is formed between the right end face of the sliding boss and the left end face of the third limit sleeve 18; the second control cavity 8 is communicated with the second oil passage hole, and the second oil passage hole is respectively connected to the oil return and the control oil through the oil return control switch 14 and the limit control switch 15; the third control cavity 9 is communicated with the control oil through the third oil passage hole;

[0009] When the moving body 12 with vector nozzle control fails, the oil return control switch 14 closes, the limit control switch 15 opens, the second control chamber 8 is connected to the control oil, the piston boss moves leftward and abuts against the right end face of the first limit sleeve 16, the sliding boss moves rightward and abuts against the left end face of the third limit sleeve 18, and the right end of the piston sleeve rod 10 restricts the movement of the moving body 12 on the piston rod 11;

[0010] When the vector nozzle control of the moving body 12 is effective, the oil return control switch 14 opens, the limit control switch 15 closes, the second control chamber 8 is connected to the oil return, the piston boss moves rightward and abuts against the left end face of the second limit sleeve 17, the sliding boss moves leftward and abuts against the right end face of the second limit sleeve 17, and the right end of the piston sleeve rod 10 releases the restriction on the movement of the moving body 12 on the piston rod 11.

[0011] Optionally, the high-pressure limit piston rod further includes: a first sliding sleeve 19 and a second sliding sleeve 20;

[0012] A first sliding sleeve 19 is arranged between the piston boss and the housing 5, and a second sliding sleeve 20 is arranged between the sliding boss and the housing 5.

[0013] Optionally, the high-pressure limit piston rod further includes: a plug 3 and a bush 6;

[0014] The left end inner cavity of the housing 5 is provided with an internal thread, the plug 3 is screwed into the internal thread at the left end of the housing 5, the bush 6 is sleeved in the housing 5 and is located between the plug 3 and the first limit sleeve 16;

[0015] The plug 3 and the limit boss at the right end of the housing 5 are used to press-fit the bush 6, the first limit sleeve 16, the first sliding sleeve 19, the second limit sleeve 17, the second sliding sleeve 20 and the third limit sleeve 18.

[0016] Optionally, sealing grooves are provided on the outer circles of both the first limit sleeve 16 and the third limit sleeve 18 for placing sealing rings and protective rings;

[0017] Between the inner circle of the first limit sleeve 16 and the piston rod 11, and between the inner circle of the third limit sleeve 18 and the piston sleeve rod 10, lip-shaped dust-proof rings, sealing rings and protective rings are provided.

[0018] Optionally, sealing rings and two protective rings are provided on the outer circle of the piston boss of the piston rod 11;

[0019] Sealing rings and protective rings are provided on both the inner circle and the outer circle of the sliding boss of the piston sleeve rod 10.

[0020] Optionally, the high-pressure limit piston rod further includes: an adjusting screw 1 and a fastening nut 2;

[0021] A threaded hole is provided at the center of the plug 3, and the adjusting screw 1 is screwed into the threaded hole at the center of the plug 3;

[0022] The fastening nut 2 is sleeved on the adjusting screw 1 to prevent the adjusting screw 1 from loosening.

[0023] Optionally, the plug 3 is circumferentially provided with weight-reducing holes.

[0024] Optionally, the second oil passage hole is provided at the right end face of the second limiting sleeve 17.

[0025] The present invention provides a high-pressure limiting piston rod. By adopting a structure with two relatively movable parts, namely a piston rod and a piston sleeve rod, and utilizing the pressure change of non-oiled oil, when the vector control system fails, according to the given hydraulic instruction, the vector nozzle control valve is restricted to the middle position, and when the vector control system works normally, the restriction on the vector nozzle control valve is released. The present invention has the advantages of high pressure resistance, high reliability, good control quality, etc. It has been used in multiple types of products with good effects. It has been successfully applied to a certain type of vector nozzle control aeroengine. Under the action of high-pressure nozzle control oil, when the vector control system fails, the present invention can reliably restrict the nozzle control valve to the middle position, so that the vector nozzle is located in the middle position, ensuring the safe and reliable operation of the engine. The device of the present invention is simple and reliable, can be integrated into the vector nozzle control system, and has great guiding and reference value for the research and production of subsequent series of products. Description of the Drawings

[0026] Figure 1 It is a schematic diagram of the non-limiting state of the high-pressure limiting piston rod provided by the present invention;

[0027] Figure 2 It is a schematic diagram of the limiting state of the high-pressure limiting piston rod provided by the present invention;

[0028] Description of the Reference Numerals:

[0029] 1 - adjusting screw; 2 - fastening nut; 3 - plug;

[0030] 4 - stop pin; 5 - housing; 6 - bush;

[0031] 7 - first control cavity; 8 - second control cavity; 9 - third control cavity;

[0032] 10 - piston sleeve rod; 11 - piston rod; 12 - moving body;

[0033] 13 - nut; 14 - oil return control switch; 15 - limit control switch;

[0034] 16 - first limiting sleeve; 17 - second limiting sleeve; 18 - third limiting sleeve;

[0035] 19 - The first sliding sleeve; 20 - The second sliding sleeve. Detailed implementation mode

[0036] The high - pressure limit piston rod provided by the present invention will be specifically explained below with reference to the accompanying drawings.

[0037] As Figure 1 and Figure 2 shown, the present invention provides a high - pressure limit piston rod, including: adjusting screw 1, fastening nut 2, plug 3, stop pin 4, housing 5, bushing 6, first limit sleeve 16, first sliding sleeve 19, second limit sleeve 17, third limit sleeve 18, second sliding sleeve 20, piston sleeve rod 10, piston rod 11, nut 13, oil return control switch 14, limit control switch 15.

[0038] Among them, the housing 5 is a hollow cylinder, with a limit boss arranged at the right end of the inner cavity and an internal thread at the left end. There are 3 oil - through holes arranged on the housing 5 from left to right, namely the first oil - through hole, the second oil - through hole and the third oil - through hole.

[0039] The third limit sleeve 18, the second sliding sleeve 20, and the piston sleeve rod 10 are successively pressed into the right - end limit boss of the inner cavity of the housing 5 along the inner cavity of the housing 5 by the second limit sleeve 17.

[0040] The piston sleeve rod 10 is of a hollow - rod structure, sleeved on the rod at the right end of the piston boss of the piston rod 11. A sliding boss is arranged at the left end, and the sliding boss slides between the second limit sleeve 17 and the third limit sleeve 18. The outer circle of the hollow rod at the right end of the piston sleeve rod 10 contacts the inner circle of the third limit sleeve 18, and the sliding boss at the left end of the piston sleeve rod 10 contacts the inner circle of the second sliding sleeve 20.

[0041] A third control cavity 9 is formed between the left - end face of the third limit sleeve 18 and the right - end face of the sliding boss of the piston sleeve rod 10, which is connected to the third oil - through hole on the housing 5, and the control oil enters the third control cavity 9 through the third oil - through hole on the housing 5.

[0042] The second limit sleeve 17 and the first sliding sleeve 19 are pressed onto the left - end face of the second sliding sleeve 20.

[0043] The piston rod 11 is a piston - rod with a boss. The middle part is a piston boss. The rod diameter at the right end of the piston boss is smaller than that at the left end. The rod diameter at the right end passes through the inner hole of the piston sleeve rod 10. A moving body 12 with a vector nozzle control is slidably sleeved outside the right end of the piston rod 11. The nut 13 is sleeved on the piston rod 11 and is located on the right side of the moving body 12.

[0044] A second control chamber 8 is formed between the right end face of the piston boss of the piston rod 11 and the left end face of the sliding boss of the piston sleeve rod 10, which is in communication with the second oil passage hole on the housing 5. The control oil enters the second control chamber 8 through the second oil passage hole on the housing 5 via the limit control switch 15. A bypass is provided between the limit control switch 15 and the second oil passage hole, and an oil return control switch 14 is provided on the bypass. The oil in the second control chamber 8 is in communication with the oil return through the oil return control switch 14. Among them, the oil return pressure is lower than the control oil pressure.

[0045] The first limit sleeve 16 is sleeved on the left end rod of the piston sleeve rod 10 and is press-fitted to the left end face of the first sliding sleeve 19 along the inner cavity of the housing 5 by the press sleeve 6.

[0046] A left control chamber 7 of the piston guide rod is formed between the right end face of the first limit sleeve 16 and the left side of the piston boss of the piston rod 11, which is in communication with the first oil passage hole on the housing 5. The control oil enters the first control chamber 7 through the first oil passage hole on the housing 5.

[0047] The plug 3 is screwed into the internal thread at the left end of the housing 5 to press the press sleeve 6. A threaded hole is provided in the middle of the plug 3. The adjusting screw 1 is screwed into the threaded hole in the middle of the plug 3, and the fastening nut 2 is screwed onto the adjusting screw 1.

[0048] During normal vector control, the limit control switch 15 is closed and the oil return control switch 14 is opened. The second control chamber 8 is in communication with the oil return. The piston rod 11 abuts against the left end face of the second limit sleeve 17 on the right under the action of the pressure in the left control chamber 7 of the piston guide rod; the piston sleeve rod 10 abuts against the right end face of the second limit sleeve 17 on the left under the action of the pressure in the third control chamber 9 on the right. At this time, the moving body 12 can slide on the piston rod 11 in a large range to realize the nozzle vector control.

[0049] When the vector control gets out of control, the limit control switch 15 is opened and the oil return control switch 14 is closed. The second control chamber 8 is in communication with the control oil. At this time, both the left and right ends of the piston boss of the piston rod 11 are under the action of the control oil pressure, but the acting area at the right end is larger than that at the left end. Therefore, the piston rod 11 abuts against the right end face of the first limit sleeve 16 on the left under the action of the pressure difference; both the left and right ends of the sliding boss of the piston sleeve rod 10 are under the action of the control oil pressure, but the acting area at the left end is larger than that at the right end. Therefore, the piston rod 11 abuts against the left end face of the third limit sleeve 18 on the right under the action of the pressure difference. At this time, the moving body 12 is restricted on the piston rod 11 by the piston sleeve rod 10 and can only move slightly within a very small range to realize the nozzle centering control.

[0050] Optionally, a sealing groove is provided on the outer ring of the third limit sleeve 18, with a sealing ring and a protective ring installed to ensure the sealing with the housing 5. Three sealing grooves are provided on the inner ring of the third limit sleeve 18, respectively installed with a lip-shaped dust-proof ring, a sealing ring and a protective ring to ensure the sealing with the right end rod of the piston sleeve rod 10 and prevent the high-pressure control oil in the third control cavity 9 from leaking.

[0051] The first limit sleeve 16 and the third limit sleeve 18 have the same structure, and sealing grooves are provided on both the inner and outer rings to accommodate the sealing device.

[0052] A sealing groove is provided on the outer ring of the piston boss of the piston rod 11, with a sealing ring and two protective rings installed to separate the high-pressure control oil in the left control cavity 7 and the second control cavity 8 of the piston guide rod.

[0053] The piston sleeve rod 10 is sleeved on the right end rod of the piston boss of the piston rod 11. Sealing grooves are provided on both the inner and outer rings of the sliding boss of the piston sleeve rod 10, with a sealing ring and a protective ring installed to separate the high-pressure control oil in the second control cavity 8 and the third control cavity 9.

[0054] Optionally, a second sliding sleeve 20 is provided in the housing 5 as a support for the sliding boss of the piston sleeve rod 10 to move in cooperation; a first sliding sleeve 19 is provided as a support for the piston boss of the piston rod 11 to move in cooperation. The provision of the second sliding sleeve 20 and the first sliding sleeve 19 facilitates the high-precision machining requirements of the inner hole, reduces the machining difficulty of the housing 5, and improves the processability and maintainability.

[0055] Optionally, the plug 3 is screwed into the internal thread at the left end of the housing 5 by its external thread, pressing the third limit sleeve 18, the second sliding sleeve 20, the second limit sleeve 17, the first sliding sleeve 19, the first limit sleeve 16, and the pressure sleeve 6 against the right end limit boss in the inner cavity of the housing 5.

[0056] A threaded hole is provided in the middle of the plug 3, and the adjusting screw 1 is screwed into the threaded hole of the plug 3 to adjust the stop position of the piston rod 11, thereby adjusting the position of the moving body 12 during emergency centering.

[0057] Weight-reducing holes are provided circumferentially on the plug 3 to reduce the weight of the entire high-pressure limit piston rod device.

[0058] The fastening nut 2 is sleeved on the adjusting screw 1 to prevent the adjusting screw 1 from loosening in a vibrating environment.

[0059] The stop pin 4 is arranged at the left end of the piston rod 11 to reduce the damage of the adjusting pin 1 to the piston rod 11. The present invention provides a high-pressure limit piston rod, which includes a piston rod and a piston sleeve rod. Each of the two rods has a moving stroke. The two moving strokes can ensure that when the moving body 12 needs vector control, there is enough moving space, and can also ensure that when the moving body 12 needs emergency centering, the movement of the moving body 12 can be stably and reliably restricted, avoiding the problems that the stroke of the moving body 12 may be insufficient or the sealing and reliability are reduced when the stroke is too long due to only using the moving stroke of one piston rod.

Claims

1. A high-pressure limit piston rod, characterized in that, Including: A housing (5), a first limit sleeve (16), a second limit sleeve (17), a third limit sleeve (18), a piston sleeve rod (10), a piston rod (11), an oil return control switch (14), and a limit control switch (15); wherein, The housing (5) is in the shape of a hollow cylinder, with a limit boss provided in the inner cavity at the right end, and the first limit sleeve (16), the second limit sleeve (17), and the third limit sleeve (18) are sequentially arranged in the inner cavity from left to right; a first oil passage hole, a second oil passage hole, and a third oil passage hole are sequentially arranged on the housing (5) at the right end face near the first limit sleeve (16), at the left end face of the second limit sleeve (17), and at the left end face of the third limit sleeve (18); A piston boss is provided in the middle of the piston rod (11), the rod diameter of the piston rod (11) at the right end of the piston boss is smaller than the rod diameter at the left end of the piston boss, the piston rod (11) is arranged in the housing (5), and the piston boss slides between the first limit sleeve (16) and the second limit sleeve (17); a first control cavity (7) is formed between the left end face of the piston boss and the right end face of the first limit sleeve (16), and the first control cavity (7) is communicated with the control oil through the first oil passage hole; a moving body (12) with vector nozzle control is slidably sleeved on the outer side of the right end of the piston rod (11); The piston sleeve rod (10) is of a hollow rod structure, sleeved on the rod at the right end of the piston boss of the piston rod (11), a sliding boss is provided at the left end of the piston sleeve rod (10), and the sliding boss slides between the second limit sleeve (17) and the third limit sleeve (18); a second control cavity (8) is formed between the right end face of the piston boss and the left end face of the sliding boss, and a third control cavity (9) is formed between the right end face of the sliding boss and the left end face of the third limit sleeve (18); the second control cavity (8) is communicated with the second oil passage hole, and the second oil passage hole is respectively connected to the oil return and the control oil through the oil return control switch (14) and the limit control switch (15); the third control cavity (9) is communicated with the control oil through the third oil passage hole; When the moving body (12) with vector nozzle control fails, the oil return control switch (14) is closed and the limit control switch (15) is opened, the second control cavity (8) is communicated with the control oil, the piston boss moves leftward and abuts against the right end face of the first limit sleeve (16), the sliding boss moves rightward and abuts against the left end face of the third limit sleeve (18), and the right end of the piston sleeve rod (10) restricts the movement of the moving body (12) on the piston rod (11); When the vector nozzle control of the moving body (12) is effective, the oil return control switch (14) is opened and the limit control switch (15) is closed, the second control cavity (8) is communicated with the oil return, the piston boss moves rightward and abuts against the left end face of the second limit sleeve (17), the sliding boss moves leftward and abuts against the right end face of the second limit sleeve (17), and the right end of the piston sleeve rod (10) releases the restriction on the movement of the moving body (12) on the piston rod (11).

2. The piston rod according to claim 1, characterized in that, Also including: A first sliding sleeve (19) and a second sliding sleeve (20); A first sliding sleeve (19) is arranged between the piston boss and the housing (5), and a second sliding sleeve (20) is arranged between the sliding boss and the housing (5).

3. The piston rod according to claim 2, wherein Also including: A plug (3) and a compression sleeve (6); The inner cavity at the left end of the housing (5) is provided with internal threads, and the plug (3) is screwed into the internal threads at the left end of the housing (5). The pressure sleeve (6) is sleeved in the housing (5) and is located between the plug (3) and the first limiting sleeve (16). The limiting boss at the right end of the plug (3) and the housing (5) is used for pressing and installing the pressure sleeve (6), the first limiting sleeve (16), the first sliding sleeve (19), the second limiting sleeve (17), the second sliding sleeve (20) and the third limiting sleeve (18).

4. The piston rod according to claim 2, characterized in that, Sealing grooves are provided on the outer circles of the first limiting sleeve (16) and the third limiting sleeve (18) for placing sealing rings and protection rings. Between the inner circle of the first limiting sleeve (16) and the piston rod (11), and between the inner circle of the third limiting sleeve (18) and the piston sleeve rod (10), lip-shaped dust-proof rings, sealing rings and protection rings are provided.

5. The piston rod according to claim 4, characterized in that, Sealing rings and two protection rings are provided on the outer circle of the piston boss of the piston rod (11). Sealing rings and protection rings are provided on both the inner and outer circles of the sliding boss of the piston sleeve rod (10).

6. The piston rod according to claim 3, wherein, It further includes: An adjusting screw (1) and a fastening nut (2); A threaded hole is provided at the center of the plug (3), and the adjusting screw (1) is screwed into the threaded hole at the center of the plug (3). The fastening nut (2) is sleeved on the adjusting screw (1) to prevent the adjusting screw (1) from loosening.

7. The piston rod according to claim 6, characterized in that, The plug (3) is circumferentially provided with weight-reducing holes.

8. The piston rod according to claim 1, characterized in that, The second oil passage hole is provided at the right end face of the second limiting sleeve (17).

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