CN1234759A

CN1234759A - Control valve apparatus

Info

Publication number: CN1234759A
Application number: CN 96180480
Authority: CN
Inventors: 林国荣
Original assignee: Twinwood Engineering Ltd
Current assignee: Twinwood Engineering Ltd
Priority date: 1996-08-29
Filing date: 1996-08-29
Publication date: 1999-11-10
Anticipated expiration: 2016-08-29
Also published as: CN1073494C

Abstract

The invention relates to a control valve apparatus providing reciprocal motion, comprising a spool and sleeve, a passage for fluid, which is hydraulic fluid in the embodiment, the passage being openable and closable by the spool and sleeve, ports (A, B, C) for fluid, and at least one seal, the arrangement being such that a seat of one seal reacts with a seat of another whereby to open the another seal.

Description

The control valve device

The present invention relates to a kind of control valve device, particularly hydraulic pressure directional control valve, this valve are in operation and make the hydraulic fluid that is generally oil carry out the function that requires by closing a fluid flow port and opening another fluid flow port.

Such valve is generally used for having in the heavy-duty machinery processing of inevitable big momentum, requires the part fast moving there.Therefore such valve usually is applied in the machinery such as pile hammer.In a kind of like this application, require fast as far as possible control valve to be switched to another flow direction from a flow direction, to eliminate the cavitation corrosion below piston and to prevent that the big momentum of moving component from producing high pressure " peak value " at the piston opposite side.Control valve must be operated pile hammer and quicken upwards so that it is suppressed to zero velocity, then it to be fallen under the gravity effect.These requirements before realized by some metallic piston rings are crossed opening, promptly adopted the pair of pistons ring, and ring is in order to closing, and another is in order to open.In general, this type of control valve operation is gratifying, but its defective is that becket finally is tending towards breaking, if particularly not employing prevention property maintenance, and piston ring also only plays partially sealed effect.So the fragment of the ring that breaks moves everywhere in system, finally ends in the filter of system until them.Can cause many consequential harm in this moving process, be directed at long shutdown with place under repair and maintenance, this all is being very expensive aspect time and the equipment.

Therefore, an object of the present invention is to seek to reduce these defectives.

According to a first aspect of the invention, proposed a kind of control valve device, this control valve device can provide reciprocating motion, and it comprises spool and sleeve; The fluid passage that can be opened, close by spool and sleeve; Fluid flow port; And at least one seal, its structure is such, i.e. the pedestal effect of the pedestal of a seal and another seal, thus open another seal.

Like this, use the present invention the basic instantaneous switching that is can be provided, do not have " overlapping " or " owing to connect ".

A base unit can be set, thereby spool and sleeve are engageable to cut off fluid flowing to passage.This provides basic is that instantaneous fluid cuts off, and can comprise under the situation of a groove in spool at base unit especially, can lay the ledge of sleeve therein.

Groove and ledge can have the sealing surfaces that matches.Its objective is and avoid leaking, and do not need additional seal.

Sealing surfaces can be an inclined surface.This simplifies the structure, because the processing on this surface is comparatively simple.

Spool can have ledge, is used for being sealed and matched with the pedestal of seal, so that cut off fluid from passage flowing to fluid flow port.This provides a kind of better simply structure.

The pedestal of seal and the ledge of spool can have the inclined surface that matches that seals.This makes structure comparatively simple again.

Relative fluid flowing passage, fluid flow port has big relatively cross section, thereby avoids setting up counter fluid pressure.This purpose is to guarantee instantaneous operation.

Can have a low pressure port, a high pressure entry and a pilot pressure inlet.This structure provides the control that meets the demands, especially when fluid is hydraulic fluid.

Sleeve has main body, and this main body can have the part of different-diameter, thereby is used on the sleeve at the masterpiece of the next substantially constant of system pressure (backward).This provides definite control, works as spool especially and has a surface that is exposed to hydraulic fluid, and this position, surface provides a substantially invariable power that is forwards making progress to spool under system pressure.

Seal or each seal are nonmetal.Even under the situation that this structure can be guaranteed to lose efficacy at the valve gear seal, move, also can not produce and damage whole device, especially when seal or each seal be when making by plastic material.

Seal (some seals) and fluid flow port (some fluid flow ports) separately also can be arranged here; Thereby there is not fluid flow port to seal by any seal.

According to a second aspect of the invention, proposed above-mentioned valve gear, it combines with a kind of reciprocator.

This reciprocating apparatus can comprise a hydraulic pile hammer.

Hereinafter be illustrated embodying control valve device of the present invention by example in conjunction with the accompanying drawings.

Fig. 1 is that the hydraulic control valve gear that the present invention proposes is applied in the pile hammer, the partial section of the position that seizes up;

The pattern that the valve gear of Fig. 2 presentation graphs 1 is in lifting (braking) or descends and drop hammer; And

The valve gear of Fig. 3 presentation graphs 1 and Fig. 2 is in the lifting pattern.

Please refer to accompanying drawing, one of expression can provide reciprocating control valve device 1 among the figure, and this device comprises spool 2 and sleeve 3; And fluid passage 4, in this embodiment, fluid is a hydraulic fluid, passage 4 can open and close by spool 2 and sleeve 3; Fluid flow port A, B, C and at least one seal 5,6, its structure is such, i.e. the pedestal effect of the pedestal of a seal 5 and another seal 6, thus open another seal 6.

In the drawings, arrow " R " is represented flowing of incoming fluid, and " S " represents flowing of effluent fluid, the high-pressure fluid zone in shadow region (Fig. 2 and 3) expression valve gear.As mentioned above, fluid flow port " A ", " B " and " C " are arranged in the device, " A " is the low-pressure fluid mouth, and " B " is high pressure input or inflow entrance, and " C " is pilot pressure input or inflow entrance.Compare with the fluid passage of device, all fluid flow ports all have big relatively cross section, thereby prevent to set up in an embodiment back-pressure.

Valve gear 1 is between anchor 7 and fluid cylinder 8 that the rear portion or the lifting of pile hammer are held, and hydraulic fluid flow to fluid cylinder 8 to handle pile hammer from passage 4.

In device 1, spool 2 and sleeve 3 are coaxial, spool 2 has the spool ledge 9 and the base unit 10 of side within it, this base unit 10 has the sealing surfaces of inclination, laying the ledge 11 of sleeve therein, this sleeve ledge 11 has an inclined surface complementary mutually with the inclined surface of base unit.

Sleeve and spool are slips.

Also be provided with a sealing device 12 with inclined surface 13, the complimentary ramp surface of spool ledge 9 can be against inclined surface 13.

Sealing device 12 comprises slip parts 14 that are used to open passage as shown in Figure 3, also is provided with a check-valves, and this check-valves is installed under the pressure such as the supporting arrangement of spring.

Sleeve 3 has two parts that diameter is different, and represents with " X " and " Y " respectively.

Please at first referring to Fig. 1, when high pressure hydraulic fluid put on fluid flow port B and goes up, passage " D " and " E " were full of during use, and therefore, check-valves 14 in opening (" cracking ") to a certain extent, and remains on open mode under middle pressure.Like this, passage " D " and " E " in other words, are subjected to bias voltage under the hydraulic pressure that acts on valve 1 under system pressure, and play hydraulic pressure biasing device or spring substantially.As previously mentioned, the diameter of sleeve " Y " is greater than diameter " X ".The constant hydraulic pressure (power) that backward directions (arrow " T ") therefore, always arranged on sleeve 3.The surperficial position of the spool 2 in passage " D " is that spool is forwards providing a constant force to (arrow " F ").In Fig. 2, pile hammer or just be braked (backward directions, arrow " T "), or under the gravity effect, fall (forwards to, arrow R, S).At this state, hydraulic fluid (being generally oil) as arrow R, circulates by valve gear shown in the S.Low pressure is provided to inside from an external source of fluid by fluid flow port " A ".Hydraulic among passage " D " and " E " is proportional at " F " the inclination complementary surface of sleeve and spool that trying hard to keep of hydraulic pressure is held in engagement in the system with one.For the pattern from the mode transition of Fig. 2 to Fig. 3, promptly the lifting pattern of valve gear 1 requires to provide high pressure to promote and to quicken pile hammer.For achieving this end, provide pilot fluid pressure by fluid flow port " C " from an external source of fluid.It acts on the surperficial position at spool 2 rear portions, reduces in passage " E " power that produces, otherwise this power works and makes spool remain on position among Fig. 2.Then as seen, spool and sleeve shift to left (forwards to, arrow " F "), the ledge 11 of sleeve 3 is engaged in the base unit 5, and force spool 2 left (as seeing) so that locate the engagement valve pedestal at " G ", and producing a sealing, this is to be caused by the power that produces in the passage " D ".

In this moment, locate to produce sealing at " G ", and throw off or split, thereby hydraulic oil is able to shown in arrow " R " in the sealing at 10 places, flow to fluid cylinder downwards by passage.

In case from fluid flow port " C " when removing pilot pressure, sleeve 3 moves along backward directions, mesh until sealing surfaces 10, and throw off simultaneously at the sealing surfaces of " G ", spool and sleeve return back to the pattern of Fig. 2 jointly as a result, thereby open fluid flow port " A " and " B " so that low-pressure hydraulic oil flows freely.

It should be noted that in these operating periods, passage " H " and " I " communicate with atmosphere.

It shall yet further be noted that because not have fluid flow port " A ", " B " or " C " be sealed sealing, so all seals can be nonmetal that this can save cost, weight reduction and minimizing maintenance.

It shall yet further be noted that and use the present invention may be provided at forward and the instantaneous switching and the vice versaad of the reality between the motion backward, this valve gear of being described in conjunction with the accompanying drawings has the following advantages, that is:

1) instantaneous switching (not having overlapping or owe to connect);

2) big fluid flow port can pass through oil fast, avoids setting up reverse pressure;

3) all seals be nonmetallic, so fault, situation of movement not can to machinery integral cause thing followed harm; With

4) this valve has the possibility of zero leakage.

Claims

1, a kind of control valve device, this control valve device can provide reciprocating motion, and it comprises spool and sleeve; The fluid passage that can be opened, close by spool and sleeve; Fluid flow port; And at least one seal, its structure is such, i.e. the pedestal effect of the pedestal of a seal and another seal, thus open another part seal.

2, valve gear as claimed in claim 1 is characterized in that, it has a base unit, thereby spool and sleeve are engageable to cut off fluid flowing to passage.

3, valve gear as claimed in claim 2 is characterized in that, base unit is included in a groove in the spool, is laying the ledge of sleeve therein.

4, valve gear as claimed in claim 3 is characterized in that, groove and ledge have the sealing surfaces that matches.

5, valve gear as claimed in claim 4 is characterized in that, sealing surfaces is an inclined surface.

As the valve gear of arbitrary claim in the claim 3 to 5, it is characterized in that 6, spool has ledge, be used for being sealed and matched, so that cut off fluid flowing from passage to fluid flow port with the pedestal of seal.

As the valve gear of right claim 6, it is characterized in that 7, the pedestal of seal and the ledge of spool have the inclined surface that matches of the sealing of being used to form.

8, the valve gear of arbitrary claim as described above is characterized in that compare with fluid flowing passage, fluid flow port has a big relatively cross section, presses thereby avoid setting up counter fluid.

9, valve gear as claimed in claim 8 is characterized in that, a low-pressure fluid mouth, a high pressure incoming fluid mouth and a pilot pressure incoming fluid mouth are arranged in the valve gear.

10, the control valve device of arbitrary claim as described above is characterized in that fluid is a hydraulic fluid.

11, the control valve device of arbitrary claim as described above is characterized in that sleeve has main body, and this main body has the part of different-diameter, thereby is used on the sleeve at the masterpiece of the next substantially constant of system pressure (backward).

As the control valve device of claim 11, it is characterized in that 12, spool has a surface that is exposed to hydraulic fluid, this position, surface provides a substantially invariable power that is forwards making progress to spool under system pressure.

13, the control valve device of arbitrary claim as described above is characterized in that seal or each seal are nonmetal.

As the control valve device of claim 13, it is characterized in that 14, seal or each seal are made of plastic material.

15, the control valve device of arbitrary claim as described above is characterized in that, this control valve device comprises seal and fluid flow port separately, thereby does not have fluid flow port to be sealed by any seal.

16, the control valve device of arbitrary claim as described above is characterized in that this valve gear combines with a reciprocator.

As the control valve device of claim 16, it is characterized in that 17, this reciprocating apparatus is a hydraulic pile hammer.