CN202082183U

CN202082183U - Double electric control pilot operated electromagnetic relief valve

Info

Publication number: CN202082183U
Application number: CN2011201962551U
Authority: CN
Inventors: 万修根; 沈群; 熊萍; 罗志清; 王瑞平; 熊贵根; 丁应鹏; 蔡永龙; 邓杰
Original assignee: Jiangling Motors Corp Ltd
Current assignee: Jiangling Motors Corp Ltd
Priority date: 2011-06-13
Filing date: 2011-06-13
Publication date: 2011-12-21
Anticipated expiration: 2021-06-13

Abstract

The utility model relates to the technical field of overflow calves, in particular to a double electric control pilot operated electromagnetic relief valve. The double electric control pilot operated electromagnetic relief valve comprises a pilot operated electromagnetic relief valve consisting of a pilot operated valve and an electromagnetic valve, and is characterized in that: when one end of the valve core of the electromagnetic valve is electrified, the valve core of the electromagnetic valve builds up voltage or unloads for the system, and when the other end is electrified, the valve core of the electromagnetic valve unloads or builds up voltage for the system. The double electric control pilot operated electromagnetic relief valve adopts electromagnetic force instead of shortage of returning spring force, therefore, the valve core can be smoothly opened and returned, and the double electric control pilot operated electromagnetic relief valve is particularly suitable for helping the valve core be smoothly returned so as to ensure the normal voltage buildup and unloading effects of the main valve of the relief valve and to effectively protect the work of hydraulic pump.

Description

A kind of two automatically controlled leading type electromagnetic relief valve

Technical field

The utility model relates to the relief valve technical field, specifically, relates to a kind of two automatically controlled leading type electromagnetic relief valve.

Background technique

Relief valve is a kind ofly to be used to keep the valve inlet pressure and to be bordering on constantly, makes the pressure controlled valve that unnecessary fluid refluxes by this valve in the system.Relief valve is the Normally closed type valve, when system pressure increases, traffic demand is reduced.This moment, relief valve was opened, and made the unnecessary flow oil sump tank that overflows, guaranteed the relief valve inlet pressure, i.e. pump discharge pressure constant (valve port is often with the pressure surge unlatching).The limit that surpasses regulation when load is opened overflow when (system pressure surpasses set pressure); carry out overload protection; make system pressure no longer increase (make usually the set pressure of relief valve higher by 10%～20%), so also can use as safety valve than system Maximum operating pressure.Along with industrialized development, relief valve is very wide in sector applications such as industrial and mineral, chemical industry and castings.

At present electromagnetic relief valve is normally single automatically controlled, adds that by a main valve solenoid directional control valve as pilot valve forms.In fact this solenoid directional control valve is made up of two-part, and promptly a hydrovalve adds an electromagnet.This hydrovalve opens or cuts out, and promotes valve core movement by electromagnet and realizes.By the operation electromagnet electric or dead electricity can allow certain position of solenoid directional control valve or communicate with fuel tank, perhaps do not communicate, thereby normally building of control main valve pressed and off-load with fuel tank.

Usually the electromagnetic relief valve working environment is more abominable, owing to be subjected to alternate load and environmetal impacts such as high temperature, dust, the elasticity coefficient of solenoid directional control valve Returnning spring diminishes, the distortion that causes of the pollutant that is subjected to of spool face and high temperature in addition, Returnning spring does not overcome the friction of spool axial displacement, to such an extent as to the main valve of electromagnetic relief valve can not satisfy normal off-load effect, thereby cause the inefficacy of electromagnetic relief valve.

The model utility content

The purpose of this utility model is to overcome the deficiencies in the prior art; adapt to the reality needs; a kind of two automatically controlled leading type electromagnetic relief valve is provided; substitute the deficiency of Returnning spring power with electromagnetic force; spool can be opened and reset smoothly; thereby the main valve that guarantees relief valve is normally built and is pressed and the off-load effect, and hydraulic pump works is played effective protective action.

In order to realize the purpose of this utility model, the technical solution adopted in the utility model is:

A kind of two automatically controlled leading type electromagnetic relief valve comprises the leading type electromagnetic relief valve that pilot valve and solenoid valve are formed, the spool of described solenoid valve at one end be that system builds pressure or off-load when electric, the other end gets when electric to be system unloaded or to build pressure.

Described solenoid valve is with the three position four-way directional control valve after the oil return inlet T shutoff, and the meta function of described three position four-way directional control valve is selected the M type for use.

The beneficial effects of the utility model are:

Substitute the deficiency of Returnning spring power with electromagnetic force; thereby spool can be opened and reset smoothly; thereby the main valve that guarantees relief valve is normally built and is pressed and the off-load effect; be particularly useful for operation under the rugged environment such as high temperature, dust; help spool to reset smoothly, hydraulic pump works is played effective protective action.

Description of drawings

Fig. 1 is the schematic diagram of prior art pilot operated compound relief valve.

Fig. 2 is the schematic diagram of prior art leading type electromagnetic relief valve.

Fig. 3 is the principle sketch of Fig. 2.

Fig. 4 is the schematic diagram of the two automatically controlled electromagnetic relief valves of the utility model.

Fig. 5 is the principle sketch of Fig. 4.

Embodiment

Below in conjunction with drawings and Examples the utility model is further specified:

Embodiment:

In conjunction with Fig. 1, Fig. 2 structural principle of the present utility model is described progressively.

Its working principle is:

Pressure among the oil circuit A acts on the spool 3 of main valve 1, and simultaneously, pressure acts on the valve ball 8 of spring 9 load side of valve core of main valve 3 and pilot valve 2 through

band damping hole

4 and 5 control access 6 and 7.If the pressure among the path A surpasses the setting value of spring 9, valve ball 8 just overcomes spring 9 and opens.To this this signal by

control access

10 and 6 from A path internal feed.The fluid of valve core of main valve 3 spring-loaded sides flows into spring chamber 12 through control access 7, damping hole 11 and ball valve 8.By control access 13 internal feeds, introduce fuel tank from here by control access 14.

Damping hole

4 and 5 produces pressure drop at valve core of main valve 3, is opened by A to B connection mouth.Fluid flows to the B pipe by the A pipe, remains unchanged and set working pressure.Relief valve 2 can be to different pressures (second pressure nominal value) off-load or switching by hydraulic fluid port X (being labeled as 15 among the figure).

Fig. 2, Fig. 3 are the schematic diagram of prior art leading type electromagnetic relief valve.

Its working principle is identical with Fig. 1 with fundamental function, and difference is that by means of the action of the two-position four-way solenoid directional control valve 16 that is installed in pilot valve 2 tops, valve core of main valve 3 can be realized off-load at any time.

When a held electricly, electromagnetic force drove the spool of right-hand member two-position four-way solenoid directional control valve among Fig. 3, and spool is arranged in position, Fig. 3 left side, and spool is opened, the solenoid directional control valve conducting, and the main valve of left end is that system builds pressure, its oil circuit process of circulation is the described mode of Fig. 1 substantially.When system pressure reached setting value, a held dead electricity, and the spool of solenoid directional control valve 16 is reset to station shown in Figure 3 by its Returnning spring, and the main valve of relief valve is the oil hydraulic pump off-load.

Fig. 4, Fig. 5 are the schematic diagram of the two automatically controlled leading type electromagnetic relief valves of the utility model.

Compare with Fig. 2, Fig. 3 of prior art, change part of the present utility model is, selector valve among two-position four-way solenoid directional control valve among Fig. 2,3 16 usefulness Fig. 5 17 is replaced, selector valve 17 is a non-standard component, doing change slightly by three position four-way directional control valve obtains,, select the three position four-way directional control valve of meta M function for use, then the T mouth is blocked.The three position four-way directional control valve of script meta M function, its static position oil inlet hole P directly is communicated with spill port T, and the AB hole blocks; After changing, its loop becomes shown in Figure 5.

At this moment, when b holds electricly, the right position of the spool that electromagnetic force drives solenoid directional control valve to Fig. 5, selector valve 17 conductings, main valve are that system builds pressure, when system pressure reaches setting value, a holds, main valve at relief valve is a system unloaded, finishes until off-load, and the spool of solenoid directional control valve is got back to meta.In this process, selector valve 17 can reset under the acting in conjunction of b end Returnning spring and a end electromagnetic force very smoothly, has overcome the deficiency that simple dependence Returnning spring resets, and has realized the purpose of this utility model.

The utility model includes but not limited to present embodiment, and every principle is identical with the utility model with mentality of designing, or the simple substitute of known technology, all falls within the protection domain of the present utility model.

Claims

1. a two automatically controlled leading type electromagnetic relief valve comprises the leading type electromagnetic relief valve that pilot valve and solenoid valve are formed, and it is characterized in that: the spool of described solenoid valve at one end be that system builds pressure or off-load when electric, the other end gets when electric to be system unloaded or to build pressure.

2. a kind of two automatically controlled leading type electromagnetic relief valves according to claim 1, it is characterized in that: described solenoid valve is that the meta function of described three position four-way directional control valve is selected the M type for use with the three position four-way directional control valve after the oil return inlet T shutoff.