CN203176033U

CN203176033U - Compact type overload oil recharging valve with variable damping

Info

Publication number: CN203176033U
Application number: CN 201320063815
Authority: CN
Inventors: 李峰; 彭程; 王贵; 李春合; 安伯友; 祁文; 姜鹏; 张振军; 赵景鹏; 王喜良
Original assignee: Shaanxi Aero Space Power Hi Tech Co Ltd
Current assignee: Shaanxi Aero Space Power Hi Tech Co Ltd
Priority date: 2013-02-04
Filing date: 2013-02-04
Publication date: 2013-09-04
Anticipated expiration: 2023-02-04

Abstract

The utility model provides a compact type overload oil recharging valve with variable damping. Valve sleeves comprise a fixed valve sleeve and a middle valve sleeve. A clearance oil way is formed between the fixed valve sleeve and the middle valve sleeve. The middle valve sleeve can move axially relative to the fixed valve sleeve. One end of the fixed valve sleeve is fixed with an engineering machine shell body, and the clearance oil way h is communicated with an oil way T. An outward extending end of the middle valve sleeve extends out from one end of the fixed valve sleeve into the oil way T and can cut off an oil way A and the oil way T. Due to the split design of the valve sleeves, the compact type overload oil recharging valve with the variable damping has the advantages of function integration and a compact structure. A high-pressure overload protection function is achieved, a low-pressure oil recharging function is also achieved, namely, the oil ways are prevented from generating serious vacuum and cavitation under special working conditions, wherein the serious vacuum and the cavitation further cause damage including noise, vibration, shock, crawl, cavitation corrosion and the like to a hydraulic system.

Description

The compact type overload Fill valve that a kind of damping is variable

Technical field

The utility model relates to a kind of overload protection valve with the repairing function, is mainly used in the hydraulic system of engineering machinery.

Background technique

At present in the hydraulic system of engineering machinery, the main effect of overload valve is that the protection hydraulic actuator is oil hydraulic cylinder or oil hydraulic motor, it is worked under the setting pressure of overload protection valve, when the oil circuit overpressure, unnecessary fluid can be connected bleed off circuit by the overload protection valve and flow back to fuel tank; The main effect of Fill valve is to prevent that oil circuit from producing serious vacuum and air pocket when special operation condition, and then causes noise, vibrations, impacts, creeps and destruction such as cavitation erosion to hydraulic system.Existing overload valve and Fill valve are to work alone respectively mostly in hydraulic system, and as shown in Figure 1, it is bigger that the shortcoming of this structure is exactly the desired structure space, are unfavorable for that the hydraulic system of engineering machinery (especially running mechanism) is integrated.

Summary of the invention

The utility model purpose is exactly on the original structure basis, it is integrated and make structure and performance optimization to carry out function, is implemented in when guaranteeing the function of use reliability, reduces the structure space demand, to satisfy engineering machinery to the harsh requirement in hydraulic element weight and space, improve its application area;

Technical solution of the present utility model is:

The compact type overload Fill valve that a kind of damping is variable comprises valve pocket, pilot valve, main valve plug,

Its special way is:

Described valve pocket comprise fixedly valve pocket 18 and in valve pocket 19, described fixedly valve pocket 18 and in be provided with gap oil duct h14 between the valve pocket 19, described in valve pocket 19 can relative fixed valve pocket 18 do axially and relatively move; One end of described fixedly valve pocket 18 is fixed with the engineering machinery housing and gap oil duct h14 communicates with oil duct T, described in the overhanging end of valve pocket 19 extend out to the oil duct T and can cut off oil duct A and oil duct T from a fixing end of valve pocket;

Described pilot valve comprises guide's valve body 24, be arranged on that the pilot valve of guide's valve body 24 1 ends is stifled 25, guide's spool 7 of being arranged on guide's valve body 24 the other ends, be arranged on the guide's spring 8 between pilot valve stifled 25 and the guide's spool; Described guide's valve body 24 is fixed on the fixedly the other end of valve pocket 18; Described guide's valve body 24 is provided with oilhole k26 with the contacted end end of main valve plug;

Described main valve plug comprises sliding valve core 16, valve core housing 17, valve core spring 5, moving core spring 15, described sliding valve core 16 cooperatively interacts with valve core housing 17 and the small end of sliding valve core 16 can to-and-fro motion in the intermediate hole of valve core housing 17, be provided with oilhole b20 with the contacted end of guide's spool on the described sliding valve core 16, oilhole b20 is provided with step hole 27, described moving core spring 15 is arranged between the step hole 27 of guide's valve body 24 and sliding valve core 16, forms oil pocket f11 between described guide's valve body 24, middle valve pocket 19, valve core housing 17 and the sliding valve core 16; Oilhole b20 one end of described sliding valve core 16 communicates with oil pocket f11, and its other end communicates with oil duct A by oilhole c21; The small end end face of described sliding valve core 16 is provided with the damping hole a22 that is communicated with oilhole b20 and oil duct A; Described valve core spring 5 is arranged between valve core housing 17 and the guide's valve body 24;

Described guide's valve body 24 is provided with oilhole g9 with main valve plug contacted one distolateral wall, and described oilhole g9 communicates with gap oil duct h14; The sidewall of valve pocket 19 is provided with hydraulic fluid port d23 in described, and described hydraulic fluid port d23 is opened on gap oil duct h14; One end of described valve core housing 17 and the overhanging end inner side surface of middle valve pocket 19 form sealing pair.

Advantage of the present utility model:

1. because its valve pocket split-type design can realize that function is integrated, the characteristics of compact structure.In the time of performance high pressure overload protective function, can bring into play the effect of low pressure repairing, prevent that namely oil circuit from producing serious vacuum and air pocket when special operation condition, and then cause noise, vibrations, impact, creep and destruction such as cavitation erosion to hydraulic system;

2. because the split-type design of its main valve plug can realize the effect that damping is variable, make that repairing functional response of the present utility model is rapider, overload protection function work is more reliable;

3. because its compact structure can adapt to engineering machinery better to the harsh requirement in hydraulic element weight and space, effectively improved its application area;

Description of drawings

Fig. 1 is the structure diagram that traditional overload protection valve and Fill valve are used in system;

Fig. 2 is the structure diagram that the utility model is used in system;

Wherein: 1-oil duct m, 2-repairing spool, 3-repairing spring, 4-oil duct n, 5-valve core spring, the 6-valve pocket, 7-guide's spool, 8-guide's spring, 9-oilhole g, 10-oil duct i, 11-oil pocket f, the 12-main valve plug, the 13-damping hole, 14-gap oil duct h, 15-moves the core spring, the 16-sliding valve core, the 17-valve core housing, 18-is valve pocket fixedly, valve pocket among the 19-, 20-oilhole b, 21-oilhole c, 22-damping hole a, 23-hydraulic fluid port d, 24-guide's valve body, the 25-pilot valve is stifled, 26-oilhole k, 27-step hole.

Embodiment

The split-type design of valve pocket 6, make 6 splits of original valve pocket be designed to fixedly valve pocket 18 and in valve pocket 19, have gap oil duct h14 between the two, middle valve pocket 19 can relative fixed valve pocket 18 be done axially and is relatively moved; The split-type design of main valve plug 12, sliding valve core 16 and valve core housing 17 that main valve plug 12 splits originally are designed to cooperatively interact; Increased moving core spring 15; Damping hole a22 is arranged on the sliding valve core 16, and during sliding valve core 16 left side, oil pocket f11 only communicates with extraneous working oil path A by oilhole b20, the damping hole a22 that is arranged on the sliding valve core 16; During right of sliding valve core 16, oil pocket f11 both communicated with extraneous working oil path A by damping hole a22 by after being arranged on the oilhole b20 on the sliding valve core 16, communicated with extraneous working oil path A by oilhole c21 again.

The 1 brief description working principle of traditional overload valve and Fill valve once at first, by reference to the accompanying drawings.When the fluid of oil circuit A was high pressure conditions, repairing spool 2 was pressed on the housing under the effect of repairing spring 3, and Fill valve is in closed condition; This moment, overload valve can play the effect that prevents oil circuit A overpressure; mechanism is as described below; high-voltage oil liquid enters oil pocket f by damping hole 13; main valve plug 12 is pressed on the valve pocket 6 under the effect of effect two ends fluid pressure balance and valve core spring 5; be that overload valve is in closed condition; when the pressure of oil circuit A is elevated to the setting pressure of pilot valve; be that guide's spool 7 overcomes guide's spring 8 under the oil liquid pressure effect spring force is moved to the left; pilot valve is opened; fluid in the oil pocket f by pilot valve through hydraulic fluid port g; oil duct i; oil duct T flows back to fuel tank; though also there is fluid to enter oil pocket f through damping hole 13; but because of damping hole 13 apertures less; enter the fluid flow of oil pocket f less than the flow that flows out fluid; so oil pocket f inner fluid pressure reduces; main valve plug 12 overcomes valve core spring 5 under the effect of two ends, left and right sides fluid pressure reduction active force is moved to the left; so separate with valve pocket 6 right side of main valve plug 12; be that overload valve is opened; fluid by overload valve through hydraulic fluid port d; oil duct T flows back to fuel tank, realizes the overload protective function of restriction oil circuit A overpressure thus.When oil circuit A was the low-voltage vacuum state, main valve plug 12 was pressed on the valve pocket 6 under the spring force effect of valve core spring 5, and namely overload valve is in closed condition; This moment, Fill valve can be realized the repairing function, mechanism is as described below, repairing spool 2 is in oil circuit A(vacuum) and the differential pressure action of oil circuit n under overcome repairing spring 3 spring force move upward, and Fill valve is opened, the fuel tank inner fluid enters oil circuit A by oil duct T, oil duct n, Fill valve (unlatching), oil duct m, replenishes fluid.

The utility model is on the basis of traditional overload valve and Fill valve, carries out the integrated and structure optimization of function, on littler space requirement, realizes high pressure overload protection function and low pressure repairing function.Working principle and above-mentioned traditional type overload valve and Fill valve are similar, and concrete working procedure is 2 as described below by reference to the accompanying drawings:

Valve pocket 6 splits are designed to fixedly valve pocket 18 and middle valve pocket 19, the valve pocket split-type design can be so that this valve be when working oil path A is in vacuum state, middle valve pocket 19 overcomes valve core spring 5 and moving core spring 15 under the differential pressure action of oil circuit A and oil duct T spring force is moved to the left, the active area of oil duct T inner fluid, for the maximum cylindrical area of middle valve pocket 19 left ends deducts the seal face area that its left end ring surface area deducts oil circuit A again, (relatively high pressure) force direction left; The active area of oil circuit A is the same with the active area size of oil duct T inner fluid, but (relatively low pressure) force direction to the right; Relative pressure can be so that middle valve pocket 19 be moved to the left; Middle valve pocket 19 leaves the end face that oil circuit A originally contacts with it and seals, and this moment, oil circuit A was connected with oil duct T, and then the fluid in the fuel tank can be realized the repairing function thus by oil duct T to the additional fluid of oil circuit A.

Main valve plug 12 split-type design are sliding valve core 16 and valve core housing 17, can realize the effect that damping is variable thus.When oil circuit A is in vacuum state, sliding valve core 16 is in right position state under the effect of moving core spring, oil pocket f directly communicates with oil circuit A by oilhole b, oilhole c, liquid between them resistance at this moment is minimum, thereby improved the speed that oil pocket f inner fluid flows to oil circuit A, namely accelerate the speed that oil pocket f inner fluid pressure reduces, and then accelerated middle valve pocket 19 travelling speed left, effectively improved the reaction velocity of this valve realization repairing function when oil circuit A is in vacuum state thus; When the pressure of oil circuit A reaches the setting pressure of pilot valve; guide's spool 7 overcomes the spring force of guide's spring 8 and opens pilot valve; fluid in the oil pocket f by pilot valve through oilhole g; gap oil duct h; oil circuit T flows back to fuel tank; so the oil liquid pressure in the oil pocket f reduces; sliding valve core 16 overcomes moving core spring 15 under the effect of left and right sides end face pressure reduction spring force is moved to the left; oilhole c on the sliding valve core 16 is closed by valve core housing 17 gradually; oil pocket f only remaining damping hole a communicates with oil circuit A; though also there is fluid to enter oil pocket f through damping hole a; but because of damping hole a aperture less; enter the fluid flow of oil pocket f less than the flow that flows out fluid; so oil pocket f inner fluid pressure continues to reduce gradually; the spring force that overcomes valve core spring 5 until valve core housing 17 under the differential pressure action of its left and right sides end face is moved to the left; the middle valve pocket 19 of this moment since fluid the active area of active force is bigger to the right; being in right position is pressed in oil circuit A and goes up motionless and keep in touch sealing; so separate with middle valve pocket 19 valve core housing 17 right sides, namely overload valve is opened valve port and is realized overload protective function.

Claims

1. the compact type overload Fill valve that damping is variable comprises valve pocket, pilot valve, main valve plug,

It is characterized in that:

Described valve pocket comprise fixedly valve pocket (18) and in valve pocket (19), described fixedly valve pocket (18) and in be provided with gap oil duct h(14 between the valve pocket (19)), described in valve pocket (19) can relative fixed valve pocket (18) do axially and relatively move; One end of described fixedly valve pocket (18) is fixed with the engineering machinery housing and gap oil duct h(14) communicate with oil duct T, described in the overhanging end of valve pocket (19) extend out to the oil duct T and can cut off oil duct A and oil duct T from a fixing end of valve pocket;

Described pilot valve comprises guide's valve body (24), be arranged on guide's valve body (24) one ends pilot valve stifled (25), be arranged on guide's valve body (24) the other end guide's spool 7, be arranged on the guide's spring (8) between pilot valve stifled (25) and the guide's spool; Described guide's valve body (24) is fixed on the fixedly the other end of valve pocket (18); Described guide's valve body (24) is provided with oilhole k(26 with the contacted end end of main valve plug);

Described main valve plug comprises sliding valve core (16), valve core housing (17), valve core spring (5), moving core spring (15), described sliding valve core (16) and valve core housing (17) cooperatively interact and the small end of sliding valve core (16) can to-and-fro motion in the intermediate hole of valve core housing (17), described sliding valve core (16) is gone up and the contacted end of guide's spool is provided with oilhole b(20), oilhole b(20) is provided with step hole (27), described moving core spring (15) is arranged between the step hole (27) of guide's valve body (24) and sliding valve core (16), described guide's valve body (24), middle valve pocket (19), form oil pocket f(11 between valve core housing (17) and the sliding valve core (16)); The oilhole b(20 of described sliding valve core (16)) end and oil pocket f(11) communicate, its other end is by oilhole c(21) communicate with oil duct A; The small end end face of described sliding valve core (16) is provided with and is communicated with oilhole b(20) and the damping hole a(22 of oil duct A); Described valve core spring (5) is arranged between valve core housing (17) and the guide's valve body (24);

Described guide's valve body (24) and main valve plug contacted one distolateral wall are provided with oilhole g(9), described oilhole g(9) with gap oil duct h(14) communicate; The sidewall of valve pocket (19) is provided with hydraulic fluid port d(23 in described), described hydraulic fluid port d(23) be opened on gap oil duct h(14); The overhanging end inner side surface of one end of described valve core housing (17) and middle valve pocket (19) forms sealing pair.