The dual circuit safety valve
(1) technical field
The utility model relates to a kind of deadweight safety valve, relates to the extraordinary all-hydraulic power car dual circuit safety valve of a kind of heavy duty specifically.
(2) background technique
In the design of Hydraulic System of the extraordinary all-hydraulic power car of heavy duty, usually need to prevent hydraulic fluid leak, especially when suddenly explosion taking place, promptly to guarantee the Security of operation mechanism at pipeline (sebific duct), prevent the continuous release of hydraulic oil again, befouling environment.And at present domestic what generally adopt is bidirectional hydraulic lock, and when breaking down, it can only be with the hydraulic oil sealing in oil cylinder, and powerless to the fuel feeding of system, makes hanging oil cylinder ineffective immediately, the promptly dangerous resource of wasting again.
(3) summary of the invention
The purpose of this utility model provides at existing problem in the above-mentioned prior art just a kind ofly is particularly suitable for the extraordinary all-hydraulic power car dual circuit safety valve of heavy duty.
Dual circuit safety valve of the present utility model comprises the end cap that is installed in the valve body two ends by link, and the spool that is positioned at the valve body hollow cavity, respectively is processed with the oil inlet hole of a connection valve body hollow cavity on the described two end cap; Described spool is installed in the valve body hollow cavity by mode movingly; Be positioned at the sealing surface for cooperatively interacting between the end face of the outlet end of the oil inlet hole on the end cap and spool; Respectively be processed with a counterbore on the left and right both ends of the surface of described spool, the limit spring that is used to limit the left and right displacement of spool is installed in the spring installation cavity that is made of counterbore and oil inlet hole.
Inside and outside conical seal (contact) face for matching between the outlet end that is positioned at the oil inlet hole on the end cap in the utility model and the end face of spool, and the tapering of the male cone (strobilus masculinus) of the inner conical surface of oil inlet hole outlet end and spool two end faces is 60 ° on the end cap.
Also can be the spherical arc shape sealing surface that matches between the outlet end that is positioned at oil inlet hole on the end cap in the utility model and the end face of spool.
Working principle of the present utility model is as follows:
Under nominal situation, spool is in the meta of body cavity under the effect of two ends centering limit spring, system by dual circuit safety valve two end cap to A, B hydraulic fluid port fuel feeding, by the reserved passageway between spool and the valve body to hydraulic fluid port C and hanging oil cylinder fuel feeding.When because of accidental cause, when wherein arbitrary pipeline explosion or leakage (as the A mouth), spool is under the effect of respective side hydraulic oil, (to the A mouth) moves fast, utilize the linear sealing that forms between the oil inlet hole outlet end inner conical surface on the male cone (strobilus masculinus) of spool end and the end cap, with hydraulic fluid port (A) sealing, and hydraulic oil can continue by another hydraulic fluid port (B) to make the suspension system oil cylinder continue to play a role to the oil cylinder fuel feeding.
The utility model can use separately also and can use in pairs according to system design.When using in pairs, one and hanging oil cylinder (plunger case) filler opening connects firmly, and enters safety valve from A, B hydraulic fluid port, enters oil cylinder from the C hydraulic fluid port; It two is installed in the pipeline, and is from the oil-feed of C hydraulic fluid port, fuel-displaced from A, B hydraulic fluid port.When using separately, safety valve and oil cylinder filler opening connect firmly, and hydraulic oil enters safety valve from A, B hydraulic fluid port, enters oil cylinder from the C hydraulic fluid port.Both structures are basic identical.
Because dual circuit safety valve of the present utility model is that hydraulic suspension is the requisite crucial constituent elements of heavily loaded extraordinary hydraulic power flatcar, the use of this safety valve can make significantly improve the working life of suspension, can improve the Security in the vehicle heavy service, have important promotional value and wide use prospect.
(4) drawing explanation
Accompanying drawing is that master of the present utility model cuts open figure.
1 is end cap among the figure, the 2nd, and limit spring, the 3rd, spool, the 4th, valve body, the 5th, O shape circle, the 6th, the counterbore that processes on the spool end, the 7th, the male cone (strobilus masculinus) of spool two end faces, the 8th, the inner conical surface of oil inlet hole outlet end, the 9th, oil inlet hole.
(5) embodiment
The utility model is further described below with reference to embodiment's (accompanying drawing):
As shown in the figure, dual circuit safety valve of the present utility model comprises the end cap (1) that is installed in valve body (4) two ends by link, and the spool (3) that is positioned at valve body (4) hollow cavity, respectively be processed with an oil inlet hole (9) that is communicated with valve body (4) hollow cavity on the described two end cap (1); Described spool (3) is installed in valve body (4) hollow cavity by mode movingly; The mode that matches with the inside and outside conical surface between the outlet end that is positioned at the oil inlet hole (9) on the end cap (1) and the end face of spool (3) is installed together; Respectively be processed with a counterbore (6) on the left and right both ends of the surface of described spool (3), the limit spring that is used to limit the left and right displacement of spool (3) is installed in the spring installation cavity that is made of counterbore (6) and oil inlet hole (9); The tapering of the inner conical surface (8) of the last oil inlet hole outlet end of end cap described in the utility model (1) and the male cone (strobilus masculinus) (7) of spool (3) two end faces is 60 °.
Assembly relation of the present utility model is as follows: be parent with valve body (4) during assembling, in the seat hole of spool (3) both sides of earlier spring (2) being packed into, put into the through hole of valve body (4) then, pushing away with have gentle hands not to have the jam phenomenon; O shape circle (5) is contained on the end cap (1), and is connected with valve body (4) with bolt.