Leakage prevention device for electro-hydraulic servo valve

Abstract

The application discloses an oil leakage prevention device for an electro-hydraulic servo valve, which comprises an electro-hydraulic servo valve body, a connecting pipe, a sealing pipe, an oil leakage prevention mechanism, a hinged seat, a pressing rod, a clamping block, a locking mechanism, a mounting ring, a supporting ring, a screen and a jacking rod, the connecting pipe is arranged on the electro-hydraulic servo valve body, the sealing pipe is slidably sleeved on the outside of the connecting pipe, an inner bushing is fixedly connected to the inside of the sealing pipe, the oil leakage prevention mechanism is arranged on the inside of the sealing pipe, the mounting ring is fixedly connected to the outside of the connecting pipe, the hinged seat is arranged on the outside of the sealing pipe, the pressing rod is hingedly connected to the hinged seat, the clamping block is fixedly connected to the pressing rod, and the clamping block is clamped with the mounting ring. The application relates to the oil leakage prevention device for the electro-hydraulic servo valve, and has the characteristics of simple mounting structure and automatic plugging during dismounting.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of oil leakage prevention devices, and particularly relates to an oil leakage prevention device for an electro-hydraulic servo valve. BACKGROUND

[0002] The electro-hydraulic servo valve is a key element in electro-hydraulic servo control, which is a kind of hydraulic control valve that outputs modulated flow and pressure corresponding to an analog electric signal. The electro-hydraulic servo valve has the advantages of fast dynamic response, high control precision and long service life, and has been widely used in electro-hydraulic servo control systems in the fields of aviation, aerospace, ships, metallurgy and chemical industry. Moreover, when the existing electro-hydraulic servo valve is overhauled and replaced, oil will overflow from the oil port of the oil line pipe every time the electro-hydraulic servo valve is disassembled, which not only pollutes the environment and wastes resources, so a supporting oil leakage prevention mechanism is set, such as the invention patent with the announcement number CN110566530A discloses an oil leakage prevention device for an electro-hydraulic servo valve, which is designed to solve the problem that the existing electro-hydraulic servo valve does not have an oil leakage prevention design when overhauled and replaced, and oil will overflow from the oil port of the oil line pipe every time the electro-hydraulic servo valve is disassembled. The present application proposes the following scheme, which comprises an electro-hydraulic servo valve, a connecting pipe connected to the electro-hydraulic servo valve, a sealing pipe movably connected to the connecting pipe, a plurality of sealing rings arranged on the inner wall of the sealing pipe, the sealing rings being sealingly connected to the outer side of the connecting pipe, four welding rods symmetrically arranged on the outer side of the sealing pipe, and a fixing strip fixedly installed on the two welding rods located on the same horizontal axis.

[0003] However, the existing oil leakage prevention device for the electro-hydraulic servo valve needs to be manually blocked before disassembly and assembly, which is relatively cumbersome, and the installation mechanism is also relatively complex, and the convenience of disassembly and assembly needs to be improved. SUMMARY

[0004] The present application aims to provide an oil leakage prevention device for an electro-hydraulic servo valve to solve the problems of manual blocking before disassembly and assembly and complex installation mechanism mentioned in the background.

[0005] The present application provides the following technical solution:

[0006] An oil leakage prevention device for an electro-hydraulic servo valve includes an electro-hydraulic servo valve body, a connecting pipe, a sealing pipe, a hinge seat, a pressure rod, a locking block, a mounting ring, a support ring, a screen, and a top rod. The electro-hydraulic servo valve body is provided with a connecting pipe, a sealing pipe is slidably sleeved on the outside of the connecting pipe, an inner bushing is fixedly connected to the inside of the sealing pipe, an oil leakage prevention mechanism is provided on the inside of the sealing pipe, a mounting ring is fixedly connected to the outside of the connecting pipe, a hinge seat is provided on the outside of the sealing pipe, a pressure rod is hinged on the hinge seat, a locking block is fixedly connected to the pressure rod, the locking block engages with the mounting ring, the pressure rod contacts the mounting ring, a locking mechanism is provided on the outside of the sealing pipe, a support ring is fixedly connected to the inside of the connecting pipe, a screen is in contact with the surface of the support ring, and a top rod is fixedly connected to the surface of the screen.

[0007] The locking mechanism includes a fixed seat, a slider, a locking block, a pull ring, a limiting rod, and a second spring. The fixed seat is fixedly connected to the outer surface of the sealing tube. The slider is slidably connected inside the fixed seat, and the locking block is fixedly connected to the top of the slider. The locking block contacts the fixed seat and the pressure rod. A pull ring is fixedly connected to the locking block. A limiting rod is fixedly connected inside the fixed seat and slidably connected to the slider. Pulling the pull ring causes the locking block to move laterally. Subsequently, the locking block compresses the second spring through the slider, and the locking block disengages from the pressure rod, thus releasing the restriction on the pressure rod. Then, pressing the pressure rod causes it to deflect through the hinge seat. The pressure rod and the locking block on the pressure rod disengage from the external mounting ring of the connecting tube, thereby releasing the restriction on the connecting tube. The electro-hydraulic servo valve body, along with the connecting tube, can then be easily removed, which is simple and convenient.

[0008] Preferably, the mounting ring is fixedly connected to two symmetrically distributed locating pins, which are slidably connected to the sealing tube. The locating pins serve to position the connection between the connecting tube and the sealing tube.

[0009] Preferably, a rubber plug is fixedly connected to the screen, and the rubber plug engages with the support ring. The design of the rubber plug facilitates the assembly and disassembly of the screen.

[0010] Preferably, a sealing ring is embedded on the outer surface of the connecting pipe, and the sealing ring contacts the inner surface of the sealing pipe. The sealing ring design ensures a tight seal between the connecting pipe and the sealing pipe.

[0011] Preferably, the oil leakage prevention mechanism comprises a fixed rod, a center block, a sleeve, a sliding rod, a plug, a first spring and a corrugated sleeve, the inner side of the sealing pipe is fixedly connected with two symmetrically distributed fixed rods, the two fixed rods are fixedly connected with the center block, the center block is fixedly connected with the sleeve, the sleeve is slidably connected with the sliding rod, the end of the sliding rod away from the center block is fixedly connected with the plug, the plug is in contact with the top rod, the sleeve is provided with the first spring, one end of the first spring is fixedly connected with the sliding rod, and the other end of the first spring is fixedly connected to the inner surface of the sleeve. When the connecting pipe is separated from the sealing pipe, the connecting pipe drives the supporting ring to move, the supporting ring drives the screen to move through the rubber plug, the screen drives the top rod to move, then the top rod is separated from the plug, the reaction force on the plug is removed, then the first spring is quickly reset, the sliding rod is returned, the plug is returned by the sliding rod, and the plug is combined with the inner sleeve tightly, so that the sealing pipe is blocked, and the oil leakage of the electro-hydraulic servo valve body after disassembly is prevented.

[0012] Preferably, the center block is fixedly connected with the corrugated sleeve, and the other end of the corrugated sleeve is fixedly connected with the plug. Through the design of the corrugated sleeve, the abrasion of the first spring during extension and contraction can be prevented from entering the oil.

[0013] Preferably, the outer portion of the limiting rod is provided with a second spring, one end of the second spring is fixedly connected with the sliding block, and the other end of the second spring is fixedly connected to the inner surface of the fixed seat. Through the design of the second spring, the reaction force can be applied to the locking block through the sliding block.

[0014] Compared with the prior art, the present application has at least the following two advantages:

[0015] Firstly, the oil leakage prevention mechanism is arranged in the sealing pipe, and the detachable screen is arranged in the connecting pipe of the electro-hydraulic servo valve body, the top rod is arranged on the screen, the top rod is in contact with the plug in the oil leakage prevention mechanism, so that the oil can be filtered to a certain extent by the screen, and impurities are prevented from accumulating in the electro-hydraulic servo valve body. In addition, the top rod can apply a reaction force to the plug to separate the plug from the inner sleeve. When the electro-hydraulic servo valve body is disassembled, the connecting pipe is separated from the sealing pipe, at this time, the top rod removes the pushing force on the plug, and the plug is combined with the inner sleeve tightly under the action of the spring, so that the sealing pipe is blocked, and the oil leakage of the electro-hydraulic servo valve body after disassembly is prevented, and the structure is simple and automatic blocking during disassembly.

[0016] Second, by setting the mounting ring outside the connecting pipe, then setting a pressure rod outside the sealing pipe through the hinged seat, setting the clamping block on the pressure rod, then setting the locking mechanism between the outer surface of the sealing pipe and the pressure rod, so that the locking mechanism can lock and limit the pressure rod, so that the pressure rod and the clamping block on the pressure rod are tightly combined with the mounting ring, ensuring the stability of the installation between the connecting pipe and the sealing pipe, in addition, only need to pull the pull ring, make the locking block and the pressure rod separate contact, can press the pressure rod, make the clamping block and the mounting ring separate, so that the connecting pipe and the sealing pipe can be separated, so as to complete the disassembly of the electro-hydraulic servo valve body, simple and convenient. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a three-dimensional structure schematic diagram of the oil leakage prevention device for the electro-hydraulic servo valve of the application;

[0018] Figure 2 It is a partial sectional structure schematic diagram of the application;

[0019] Figure 3 It is an enlarged structure schematic diagram of the oil leakage prevention mechanism in the application;

[0020] Figure 4 It is an enlarged structure schematic diagram of the locking structure in the application;

[0021] Figure 5 It is a side view structure schematic diagram of the inner bushing in the application;

[0022] Figure 6 It is a side view structure schematic diagram of the support ring in the application.

[0023] In the figure: 1, electro-hydraulic servo valve body; 2, connecting pipe; 3, sealing pipe; 4, oil leakage prevention mechanism; 5, hinged seat; 6, pressure rod; 7, clamping block; 8, locking mechanism; 9, mounting ring; 10, positioning pin; 11, support ring; 12, screen; 13, ejector rod; 14, rubber plug; 15, inner bushing; 16, sealing ring; 41, fixed rod; 42, center block; 43, sleeve; 44, sliding rod; 45, plug; 46, first spring; 47, corrugated sleeve; 81, fixed seat; 82, sliding block; 83, locking block; 84, pull ring; 85, limiting rod; 86, second spring. EMBODIMENT

[0024] As Figures 1-6 shown in the specific embodiment, the following technical solutions are adopted:

[0025] The utility model provides an oil leakage prevention device for electro-hydraulic servo valve, including electro-hydraulic servo valve body 1, connecting pipe 2, sealing pipe 3, articulated seat 5, pressure rod 6, clamping block 7, mounting ring 9, support ring 11, screen 12 and jackscrew 13, be provided with connecting pipe 2 on electro-hydraulic servo valve body 1, the outside sliding sleeve of connecting pipe 2 is connected with sealing pipe 3, the inboard fixed connection of sealing pipe 3 has inner bushing 15, the inboard of sealing pipe 3 is provided with oil leakage prevention mechanism 4, the outside fixed connection of connecting pipe 2 has mounting ring 9, the outside of sealing pipe 3 is provided with articulated seat 5, articulated seat 5 is hinged with pressure rod 6, pressure rod 6 is fixedly connected with clamping block 7, clamping block 7 is clamped with mounting ring 9, and pressure rod 6 is in contact with mounting ring 9, the outside of sealing pipe 3 is provided with locking mechanism 8, the inboard fixed connection of connecting pipe 2 has support ring 11, and the surface contact of support ring 11 has screen 12, and the surface fixed connection of screen 12 has jackscrew 13.

[0026] Wherein, two symmetrical distribution's locating pin 10 is fixedly connected on mounting ring 9, and locating pin 10 is slidably connected with sealing pipe 3. Through the design of locating pin 10, the connection between connecting pipe 2 and sealing pipe 3 has the positioning effect.

[0027] Wherein, rubber plug 14 is fixedly connected on screen 12, and rubber plug 14 is clamped with support ring 11. Through the design of rubber plug 14, the dismounting of screen 12 is facilitated.

[0028] Wherein, sealing ring 16 is embedded on the outer surface of connecting pipe 2, and sealing ring 16 is in contact with the inner surface of sealing pipe 3. Through the design of sealing ring 16, the sealing property of the connection between connecting pipe 2 and sealing pipe 3 can be guaranteed.

[0029] Wherein, oil leakage prevention mechanism 4 includes fixed rod 41, center block 42, sleeve 43, sliding rod 44, plug 45, first spring 46 and bellows 47, the inboard fixed connection of sealing pipe 3 has two symmetrical distribution's fixed rod 41, two fixed rod 41 are jointly fixedly connected with center block 42, center block 42 is fixedly connected with sleeve 43, sliding rod 44 is slidably connected in sleeve 43, plug 45 is fixedly connected on the end away from center block 42 of sliding rod 44, plug 45 is in contact with jackscrew 13, first spring 46 is arranged in sleeve 43, one end of first spring 46 is fixedly connected with sliding rod 44, and the other end of first spring 46 is fixedly connected to the inner surface of sleeve 43. While connecting pipe 2 and sealing pipe 3 are separated, connecting pipe 2 drives support ring 11 to move, support ring 11 drives screen 12 to move through rubber plug 14, screen 12 drives jackscrew 13 to move, then jackscrew 13 is separated from plug 45, and the counterforce of plug 45 is removed, then first spring 46 resets rapidly, sliding rod 44 is returned by jackscrew 13, plug 45 is returned by sliding rod 44, plug 45 is tightly combined with inner bushing 15, sealing pipe 3 is blocked, thereby preventing oil leakage after electro-hydraulic servo valve body 1 is disassembled.

[0030] The center block 42 is fixedly connected with a corrugated sleeve 47, and the other end of the corrugated sleeve 47 is fixedly connected with the plug 45. Through the design of the corrugated sleeve 47, the abrasion of the first spring 46 during extension and contraction can be prevented from entering the oil.

[0031] The locking mechanism 8 comprises a fixed seat 81, a sliding block 82, a locking block 83, a pull ring 84, a limiting rod 85 and a second spring 86. The fixed seat 81 is fixedly connected to the outer surface of the sealing pipe 3. The sliding block 82 is slidingly connected in the fixed seat 81. The top of the sliding block 82 is fixedly connected with the locking block 83. The locking block 83 is in contact with the fixed seat 81 and the pressure rod 6. The locking block 83 is fixedly connected with the pull ring 84. The limiting rod 85 is fixedly connected in the fixed seat 81 and is slidingly connected with the sliding block 82. By pulling the pull ring 84, the pull ring 84 drives the locking block 83 to move horizontally. Then, the locking block 83 compresses the second spring 86 through the sliding block 82. Moreover, the locking block 83 is out of contact with the pressure rod 6, thereby releasing the restriction on the pressure rod 6. Then, the pressure rod 6 is pressed to deflect through the hinged seat 5. The pressure rod 6 and the clamping block 7 on the pressure rod 6 are out of contact with the mounting ring 9 outside the connecting pipe 2, thereby releasing the restriction on the connecting pipe 2. Then, the electro-hydraulic servo valve body 1 together with the connecting pipe 2 can be easily taken down, which is simple and convenient.

[0032] The outer part of the limiting rod 85 is provided with the second spring 86. One end of the second spring 86 is fixedly connected with the sliding block 82, and the other end of the second spring 86 is fixedly connected to the inner surface of the fixed seat 81. Through the design of the second spring 86, the reaction force can be applied to the locking block 83 through the sliding block 82.

[0033] When the electro-hydraulic servo valve body 1 needs to be disassembled and repaired, the pull ring 84 is pulled to drive the locking block 83 to move horizontally. Then, the locking block 83 compresses the second spring 86 through the sliding block 82. Moreover, the locking block 83 is out of contact with the pressure rod 6, thereby releasing the restriction on the pressure rod 6. Then, the pressure rod 6 is pressed to deflect through the hinged seat 5. The pressure rod 6 and the clamping block 7 on the pressure rod 6 are out of contact with the mounting ring 9 outside the connecting pipe 2, thereby releasing the restriction on the connecting pipe 2. Then, the electro-hydraulic servo valve body 1 together with the connecting pipe 2 can be easily taken down, which is simple and convenient.

[0034] And in the connection pipe 2 and sealing pipe 3 is separated at the same time, the connection pipe 2 with support ring 11 moves, support ring 11 through the rubber plug 14 with screen 12 moves, and screen 12 will bring the top bar 13 moves, then the top bar 13 and the plug 45 off contact, and remove the plug 45 of the reaction force, then the first spring 46 reset quickly, and will slide bar 44 back to the top, and the slide bar 44 will plug 45 back to the top, and make the plug 45 and the inner sleeve 15 close combination, sealing pipe 3 is blocked, so as to prevent the electro hydraulic servo valve body 1 after the oil leakage of the disassembly.

Claims

1. An oil leakage prevention device for an electro-hydraulic servo valve, comprising an electro-hydraulic servo valve body (1), a connecting pipe (2), a sealing pipe (3), a hinged seat (5), a pressing rod (6), a clamping block (7), a mounting ring (9), a supporting ring (11), a screen (12) and a jacking rod (13), characterized in that: The electro-hydraulic servo valve body (1) is provided with a connecting pipe (2), the outer part of the connecting pipe (2) is sleeved with a sealing pipe (3), the inner side of the sealing pipe (3) is fixedly connected with an inner bushing (15), the inner side of the sealing pipe (3) is provided with an oil leakage prevention mechanism (4), the outer part of the connecting pipe (2) is fixedly connected with a mounting ring (9), the outer part of the sealing pipe (3) is provided with a hinged seat (5), the hinged seat (5) is hingedly connected with a pressing rod (6), the pressing rod (6) is fixedly connected with a clamping block (7), the clamping block (7) is clamped with the mounting ring (9), the pressing rod (6) is in contact with the mounting ring (9), the outer part of the sealing pipe (3) is provided with a locking mechanism (8), the inner side of the connecting pipe (2) is fixedly connected with a supporting ring (11), the surface of the supporting ring (11) is in contact with a screen mesh (12), the surface of the screen mesh (12) is fixedly connected with a top rod (13). The locking mechanism (8) comprises a fixed seat (81), a sliding block (82), a locking block (83), a pull ring (84), a limiting rod (85) and a second spring (86), the fixed seat (81) is fixedly connected to the outer surface of the sealing pipe (3), the sliding block (82) is slidably connected in the fixed seat (81), the top of the sliding block (82) is fixedly connected with the locking block (83), the locking block (83) is in contact with the fixed seat (81), the locking block (83) is in contact with the pressing rod (6), the pull ring (84) is fixedly connected to the locking block (83), the limiting rod (85) is fixedly connected in the fixed seat (81), and the limiting rod (85) is slidably connected with the sliding block (82). The oil leakage prevention mechanism (4) comprises a fixed rod (41), a center block (42), a sleeve (43), a sliding rod (44), a plug (45), a first spring (46) and a corrugated sleeve (47), the inner side of the sealing pipe (3) is fixedly connected with two symmetrical fixed rods (41), the two fixed rods (41) are fixedly connected with the center block (42) in common, the center block (42) is fixedly connected with the sleeve (43), the sleeve (43) is slidably connected with the sliding rod (44), the end, away from the center block (42), of the sliding rod (44) is fixedly connected with the plug (45), the plug (45) is in contact with the top rod (13), the first spring (46) is arranged in the sleeve (43), one end of the first spring (46) is fixedly connected with the sliding rod (44), and the other end of the first spring (46) is fixedly connected to the inner surface of the sleeve (43).

2. The oil leakage prevention device for an electro-hydraulic servo valve according to claim 1, characterized by: The mounting ring (9) is fixedly connected with two symmetrical positioning pins (10), and the positioning pins (10) are slidably connected with the sealing pipe (3).

3. The oil leakage prevention device for an electro-hydraulic servo valve according to claim 1, characterized by: The screen mesh (12) is fixedly connected with a rubber plug (14), and the rubber plug (14) is clamped with the supporting ring (11).

4. The oil leakage prevention device for an electro-hydraulic servo valve according to claim 1, characterized by: The outer surface of the connecting pipe (2) is embedded with a sealing ring (16), and the sealing ring (16) is in contact with the inner surface of the sealing pipe (3).

5. The oil leakage prevention device for an electro-hydraulic servo valve according to claim 1, characterized by: The center block (42) is fixedly connected with the corrugated sleeve (47), and the other end of the corrugated sleeve (47) is fixedly connected with the plug (45).

6. The oil leakage prevention device for an electro-hydraulic servo valve according to claim 1, characterized by: The outer portion of the limiting rod (85) is provided with a second spring (86), one end of the second spring (86) is fixedly connected with the sliding block (82), and the other end of the second spring (86) is fixedly connected to the inner surface of the fixed seat (81).

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