CN101435447A - Electro-hydraulic directional valve - Google Patents
Electro-hydraulic directional valve Download PDFInfo
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- CN101435447A CN101435447A CN 200710048100 CN200710048100A CN101435447A CN 101435447 A CN101435447 A CN 101435447A CN 200710048100 CN200710048100 CN 200710048100 CN 200710048100 A CN200710048100 A CN 200710048100A CN 101435447 A CN101435447 A CN 101435447A
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Abstract
The invention relates to an electro-hydraulic reversing valve which comprises a main valve body with a pilot valve; the inside of the main valve body is provided with a main valve hole ; the inside of the main valve hole is provided with a main valve core; the inside of the valve body is also cast with grooves P, T, A and B communicated with the main valve hole; two grooves T are arranged on the outer sides of the grooves A, P and B and are connected through an inner flow passage; the pilot valve is respectively connected with two ends of the main valve hole through two oblique holes on the main valve body; two ends of the main valve core are sleeved with springs; two ends of the main valve body are provided with end covers for covering the main valve core; an oil port of the groove P of the main valve body close to the bottom surface is provided with an inner control groove which is cast parallel to the bottom surface; the bottom surface of the valve body is also provided with an outer control port X; and the outer control port X is communicated with the inner control groove through an outer control groove. The electro-hydraulic reversing valve is characterized in that the inner control groove is a step type hole; the outer side of the inner control groove is provided with a large cone plug for preventing oil from leaking outwards; and the inner side of the inner control groove is provided with a small cone plug for preventing the outer control port X and the groove P from being communicated.
Description
Technical field
The present invention relates to technical field of hydraulic, concrete to relate to a kind of be the hydraulicdirectional control valve that the guide controls with the solenoid valve.
Background technique
In hydraulic system, in order to control the flow direction of hydraulic oil, often use a kind of hydraulicchange-over valve, this valve utilizes hydraulic oil to promote the spool commutation, to realize the control to high flow directional control valve.And hydraulicchange-over valve often adopts little latus rectum again.Hydraulicchange-over valve often adopts little bare sizing electro-magnetic valve to control the changeover valve core commutation of big flow as pilot-actuated valve again.The combination of this electromagnetic priority valve and hydraulicchange-over valve is electro-hydraulic directional valve.
The electro-hydraulic directional valve structure of traditional spring reset as shown in Figure 1 and Figure 2; Part comes with some shortcomings.
1. control oil is interior is to realize by the installation direction conversion with bearing pin for the conversion with outer confession.Figure 2 shows that outer deposition attitude, the microcephaly of bearing pin 01 separates control oil by the seal ring on the microcephaly 02 with P mouth and X mouth and is entered by the X mouth inwardly.As bearing pin 01 is oppositely installed, then major part inwardly, the microcephaly is stretched in the hole on the end cap outwardly, under the effect of P mouth pressure, top outwardly is spacing by end cap all the time, keeps the P mouth to communicate with the X mouth, control is oily to be provided by the P mouth.Shortcoming is the outer bearing pin of installing, the valve body structure complexity, and the complex structure of bearing pin own also will be done manual work on end cap, makes the end cover structure complexity.
2. control oil arrives the channel track at main valve plug two ends, be at main valve body end face rat holing, communicate with straight hole and inclined hole on the end cap again, arrive spring chamber, seal groove fitting tight circle must be arranged on the end cap, the end cover structure complexity, and the sealing of end cap straight hole and main valve body inclined hole is the articulating that possible cause outer seepage.
3. the spring seat at main valve plug two ends is the plain cushion structure, the positioning and guiding of spring mainly is the little cylindrical of main valve plug end, gap between spring inside diameter and the little cylindrical is bigger, and the main valve plug commutation is carried out with reset cycle, guiding length is in the continuous change process, influence the working life of spring easily, reliability is influenced.
4. when off position, two ends spring pressing spring seat withstands on the main valve body, and main valve plug is limited in meta, and main valve plug shoulder and spring seat almost do not have the gap, only the little cylindrical and the gap of spring base hole and main valve plug.Behind control oil, control-oil pressure acts on the main valve plug end, and main valve plug begins to move.In the moment that begins to move, stress surface mainly is the end area of the little cylindrical of main valve plug, rather than the big cylindrical area of main valve plug, therefore needs bigger control-oil pressure could start main valve plug.And after the startup, the control oil that acts on the annulus area is to enter by the gap between spring seat and the main valve plug, and through-current capability is restricted.Working control oil active area when starting because of main valve plug is little, needs bigger control-oil pressure, thereby the restricted application of control-oil pressure is restricted.
Summary of the invention
Technical problem to be solved by this invention is, overcomes problems of the prior art, and a kind of electro-hydraulic directional valve is provided.
In order to address the above problem technological scheme of the present invention is such:
A kind of electro-hydraulic directional valve, comprise a main valve body that has pilot valve, described main valve body inside has main valve hole, be provided with main valve plug in the described main valve hole, also be cast with the P that communicates with main valve hole in the described valve body, T, A, the B groove, described T groove is two and is arranged on A, P, the outside of B groove, and it is continuous by inner flow passage, described pilot valve connects the two ends of main valve hole respectively by two inclined holes on the main valve body, the main valve plug two ends are with spring, the main valve body two ends have the end cap that covers main valve plug, the P groove hydraulic fluid port of described main valve body is provided with the internal control groove of the casting of parallel and bottom surface near the place, bottom surface, described valve body bottom surface also has outside control mouth X, described outside control mouth X communicates by the external control groove with the internal control groove, it is characterized in that, described internal control groove is the stepped ramp type hole, be equipped with in the outside of internal control groove and prevent to control the big cone blocking that oil exosmoses, the little cone blocking that prevents that outside control mouth X from communicating with groove P is housed in the inboard of internal control groove.
Described big cone blocking and little cone blocking are arranged on the internal control groove by screw thread, and the stifled position of described conelet is located in the outer dead slot.
Described main valve hole two ends are counterbore, and two inclined holes on the described valve body communicate with the counterbore at main valve hole two ends respectively.
Described main valve plug two ends are provided with spring seat, and described spring one end is against on the spring seat, and the other end is against on the end cap.
The hole that can be enclosed within on the main valve plug is arranged in the middle of the described spring seat, and the spring seat outside is a two-stage step cylindrical, is provided with four through-flow grooves in big cylindrical bottom.
Beneficial effect, control oil is outer, and designs simplification reduces cost, and reduces outer seepage link for easy with the conversion of interior confession, and the spring reliability height that led, the main valve plug breakout pressure that commutates is low, and the application adaptation of valve is wide.
Description of drawings
Describe the present invention in detail below in conjunction with the drawings and specific embodiments;
Fig. 1 is the cross-sectional view of existing electro-hydraulic directional valve;
Fig. 2 is local L-L cross-sectional view of Fig. 1;
Fig. 3 is the cross-sectional view of a kind of electro-hydraulic directional valve of the present invention;
Fig. 4 is local M-M cross-sectional view of Fig. 3;
Fig. 5 is a spring seat cross-sectional view of the present invention;
Fig. 6 is that the K of Fig. 5 is to view.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
Referring to Fig. 3, the present invention includes a main valve body 3, there is a main valve hole inside, cast out P, T, A, B groove in the main valve hole, the T groove has two, links to each other near outer survey and by inner flow passage, P, T, A, B groove have the hole that passes to main valve body 3 bottom surfaces respectively, as the interface that communicates with the outside.P is a filler opening, and T is a return opening, and A, B are actuator port.The main valve hole two ends are counterbore, and there are two straight holes at main valve body 3 tops in A1 and corresponding section, B1 hole with pilot valve 6, and counterbore links to each other by the inclined hole that gets out with straight hole.
The P hydraulic fluid port of main valve body 3 is casting out the internal control groove 9 that is parallel to the bottom surface near the place, bottom surface.
There is outside control mouth X the bottom surface of main valve body 3, links to each other with the external control groove 11 that casts out.
Make a step hole at the right-hand member of main valve body 3, aperture communicates with internal control groove 9 and external control groove 11.Screw thread is made in the aperture of aperture and macropore respectively.Aperture screw thread place dress conelet blocks up 10, and macropore screw thread place adorns big cone blocking 12.Conelet stifled 10 control oil outer for the time use, prevent from that the external control of coming in from the X mouth is oily to communicate with the fluid of P mouth.Big cone blocking 12 is blocked control oil, prevents outer seepage.
Makes many grooves in the middle of the big cylindricals of main valve plug 4, corresponding with the groove of main valve body 3, the size of groove is according to different commutation functions and difference.Little cylindrical is made at main valve plug 4 two ends, and little cylindrical end face is circular stress surface 13, and the end face between big cylindrical and the little cylindrical forms annular stress surface 14.
The main valve plug 4 of packing in the main valve hole, main valve plug 4 two ends shoot spring abutment 7.
Porose in the middle of the spring seat 7, the outside is the two-stage cylindrical, makes 4 through-flow grooves 15 in the end of big cylindrical, enters the path at main valve plug 4 two ends as control oil.
The top dress pilot valve 6 of main valve body 3, the both sides of pilot valve 6 are electromagnet 16.
The working principle explanation:
Be shaped as the example explanation with spool shown in Figure 3.
If control oil is outer for pattern, conelet stifled 10 is installed then.When the control oil bottom surface X mouth from main valve body 3 enters, arrive the top of main valve bodies 3 by external control groove 11, enter pilot valve 6 again, by the electromagnet 16 at pilot valve 6 two ends the dead electricity situation, decision has or not control oil, and control oil enters the A1 mouth or the B1 mouth of pilot valve.When two electromagnet 16 of pilot valve 6 all must not electricity, P, T, four hydraulic fluid ports of A, B were not connected.Get electric back control oil as some electromagnet of pilot valve 6 and enter the A1 mouth, then control oil enters the left end spring chamber of main valve plug 4 from left side inclined hole, action of hydraulic force is at circular stress surface 13, gap between the little cylindrical of the through-flow groove 15 by spring seat 7 and spring seat 7 and main valve plug 4 simultaneously, act on the annular stress surface 14, overcome the power of surging, the impacting force of frictional force and the right spring 8, promote main valve plug 4 be shifted to the right to run into end cap 1 till, P mouth and B mouth are connected, A mouth and T mouth are connected, and as electromagnet 16 dead electricity, then control oil is through pilot valve 6 oil sump tanks, main valve plug 4 left ends do not have the hydraulic coupling effect, and main valve plug 4 returns under the promotion of spring 8 on the right.In like manner, get electric back control oil as some electromagnet of pilot valve 6 and enter the B1 mouth, then control oil enters the right-hand member spring chamber of main valve plug 4 from the right inclined hole, action of hydraulic force is at circular stress surface 13, gap between the little cylindrical of the through-flow groove 15 by spring seat 7 and spring seat 7 and main valve plug 4 simultaneously, act on the annular stress surface 14, promote main valve plug 4 move left to run into end cap 1 till, P mouth and A mouth are connected, B mouth and T mouth are connected, and as electromagnet 16 dead electricity, then control oil is through pilot valve 6 oil sump tanks, main valve plug 4 right-hand members do not have the hydraulic coupling effect, return under the promotion of main valve plug 4 on the left side springs 8.
If supply pattern in the control oil, then do not have conelet and block up 10, control oil flows out to external control groove 11 from the P mouth, arrives the top of main valve body 3, enters pilot valve 6 again.All the other Principles of Process are the same.
By to the dress of conelet stifled 10 or tear open, can make things convenient for realize control oil outer for and the conversion of interior confession, do not need for supplying outward and two kinds of valve bodies are prepared in interior confession respectively.
Compared with prior art, control of the present invention oil is outer, and designs simplification reduces cost, and reduces outer seepage link for easy with the conversion of interior confession, the spring reliability height that led, and main valve plug commutation breakout pressure is low, and the application adaptation of valve is wide.
More than show and described basic principle of the present invention, major character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that describes in the foregoing description and the specification just illustrates principle of the present invention; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (5)
1, a kind of electro-hydraulic directional valve, comprise a main valve body that has pilot valve, described main valve body inside has main valve hole, be provided with main valve plug in the described main valve hole, also be cast with the P that communicates with main valve hole in the described valve body, T, A, the B groove, described T groove is two and is arranged on A, P, the outside of B groove, and it is continuous by inner flow passage, described pilot valve connects the two ends of main valve hole respectively by two inclined holes on the main valve body, the main valve plug two ends are with spring, the main valve body two ends have the end cap that covers main valve plug, the P groove hydraulic fluid port of described main valve body is provided with the internal control groove of the casting of parallel and bottom surface near the place, bottom surface, described valve body bottom surface also has outside control mouth X, described outside control mouth X communicates by the external control groove with the internal control groove, it is characterized in that, described internal control groove is the stepped ramp type hole, be equipped with in the outside of internal control groove and prevent to control the big cone blocking that oil exosmoses, the little cone blocking that prevents that outside control mouth X from communicating with groove P is housed in the inboard of internal control groove.
2, a kind of electro-hydraulic directional valve according to claim 1 is characterized in that, described big cone blocking and little cone blocking are arranged on the internal control groove by screw thread, and the stifled position of described conelet is located in the outer dead slot.
3, a kind of electro-hydraulic directional valve according to claim 1 is characterized in that, described main valve hole two ends are counterbore, and two inclined holes on the described valve body communicate with the counterbore at main valve hole two ends respectively.
4, a kind of electro-hydraulic directional valve according to claim 1 is characterized in that, described main valve plug two ends are provided with spring seat, and described spring one end is against on the spring seat, and the other end is against on the end cap.
5, a kind of electro-hydraulic directional valve according to claim 5 is characterized in that, the hole that can be enclosed within on the main valve plug is arranged in the middle of the described spring seat, and the spring seat outside is a two-stage step cylindrical, is provided with four through-flow grooves in big cylindrical bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710048100 CN101435447A (en) | 2007-11-12 | 2007-11-12 | Electro-hydraulic directional valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710048100 CN101435447A (en) | 2007-11-12 | 2007-11-12 | Electro-hydraulic directional valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101435447A true CN101435447A (en) | 2009-05-20 |
Family
ID=40710032
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200710048100 Pending CN101435447A (en) | 2007-11-12 | 2007-11-12 | Electro-hydraulic directional valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101435447A (en) |
-
2007
- 2007-11-12 CN CN 200710048100 patent/CN101435447A/en active Pending
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| C06 | Publication | ||
| PB01 | Publication | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20090520 |