An ultra-high pressure and large flow electro-hydraulic reversing valve
A technology of electro-hydraulic reversing valve and electromagnetic reversing valve, applied in the field of hydraulic components, which can solve problems such as large deformation, stuck valve core of reversing valve, and lack of three-position and four-way functions, so as to achieve stable and controllable flow , Improve reliability, effect of small deformation
Active Publication Date: 2018-07-27
YANSHAN UNIV
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Problems solved by technology
The published invention patent (CN102364179A) provides an ultra-high pressure (70MPa) reversing valve structure directly driven by an electromagnet, but due to the inherent maximum output force limitation of the electromagnet, it is difficult to overcome the steady / instantaneous instability of the valve core under large flow rates. Therefore, its flow capacity cannot be further improved; the published utility model patent (CN204200734U) provides an ultra-high pressure reversing valve structure in which a pilot valve controls a cartridge valve. Although it has a large flow capacity, due to Its main valve is a cartridge valve, which can only realize the on-off function of the oil circuit (two-position two-way), and does not have the function of three-position four-way, so its application in ultra-high pressure systems is limited, etc.
In addition, the spools in the above ultra-high pressure reversing valve structures all use a single-part metal spool. Due to the large deformation of the metal under ultra-high pressure conditions and large changes in oil temperature, it is easy to affect the inherent characteristics of the spool and valve sleeve. The cooperation of the reversing valve leads to the stuck phenomenon of the spool when the reversing valve is working
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[0035] Specific implementation Figure 1 to Figure 10 As shown in the schematic diagram of the present invention, the electromagnetic directional valve 1 and the double one-way throttle valve 2 are superimposed and installed on the valve body 4 by four hexagon socket head screws A3. The ceramic sleeve 19 and the valve body 4 are Surplus fit. The iron core 20 and the ceramic core 21 have an interference fit, which is called a combined valve core. The combined valve core and the ceramic sleeve 19 have a clearance fit. The cylindrical pin B31 is installed on the right end cover 25 to limit the circumferential rotation of the combined valve core.
[0036] The left end cover 15 is installed to the left side of the valve body 4 by seven hexagon socket head screws B16. The annular seal between the left end cover 15 and the valve body 4 adopts O-ring B7 and the retaining ring 8, and the flow channel M15 connected with the valve body 4 1 Use O-ring A6 to seal, and the left end cover 15 f...
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The invention provides a super-high-pressure large-flow electro-hydraulic reversing valve. The super-high-pressure large-flow electro-hydraulic reversing valve mainly comprises an electromagnetic reversing valve body, dual one-way throttling valves, a hexagon socket head cap screw A, a valve body, a sealing hexagonal thread plug, an O-shaped ring A, an O-shaped ring B, a stop ring, a plunger bushing, a seal A for a piston, a plunger and the like. By means of the super-high-pressure large-flow electro-hydraulic reversing valve, the impact damage to a ceramic core of the plunger bushing and a right end cover when the electro-hydraulic reversing valve performs reversing can be avoided; compared with a traditional metal valve core, the ceramic core can relieve wear of oil liquid to a throttling opening of the reversing valve when the electro-hydraulic reversing valve works for a long time, and smaller deformation quantity can be generated in a super-high-pressure working condition when the oil liquid temperature is changed. The flow of the reversing valve can be stable and controllable trough peripheral rotation of a limiting combined valve core; and communication between the super-high-pressure oil liquid and the control oil liquid of the pilot electromagnetic reversing valve body is avoided, the majority of ducts in the valve body are free of the problem of super-high-pressure strength, convenience is provided for industrialization of the valve, and work reliability of the valve in the super-high-pressure working condition is improved.
Description
Technical field [0001] The invention belongs to the field of hydraulic components and is a large-flow electro-hydraulic directional valve that works under ultra-high pressure. Background technique [0002] In recent years, the ultra-high pressure of hydraulic system (generally 70MPa and above) has become a trend. Compared with the normal pressure system, the ultra-high pressure hydraulic system has the advantages of light weight, small volume, and large output under the same working conditions. It is mostly used in rolling mills, presses and aviation hydraulics. With the development of high-speed and high-pressure hydraulic systems, the hydraulic components that make up the hydraulic system are gradually becoming high-pressure. Due to the advantages of ultra-high-pressure hydraulic systems, it is particularly important to study ultra-high-pressure hydraulic components. [0003] The reversing valve is one of the most commonly used hydraulic components in ultra-high pressure hydrau...
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IPC IPC(8): F15B13/02
CPCF15B13/028
Inventor孔祥东俞滨赵华龙朱琦歆
OwnerYANSHAN UNIV