CN100453139C

CN100453139C - Fluid tank

Info

Publication number: CN100453139C
Application number: CNB2006101518371A
Authority: CN
Inventors: 小西晃子; 石井庄太郎; 近石康司; 金山登; 野原达郎
Original assignee: Komatsu Ltd
Current assignee: Komatsu Ltd
Priority date: 2002-05-22
Filing date: 2003-05-22
Publication date: 2009-01-21
Anticipated expiration: 2023-05-22
Also published as: CN100509105C; CN100453140C; CN1935310A; CN1935311A; CN1966123A; CN1935312A; CN100453138C

Abstract

A hydraulic tank, wherein a cyclone type bubble removing device 30 is arranged. Therefore, it is no longer necessary to secure a space for installing a bubble removing device 30 outside and hence the space dedicated to the hydraulic system can be reduced. Since the bubble removing device 30 is fitted to the inside of the hydraulic tank 1 in advance, it does not need to be installed separately somewhere in the hydraulic circuit so that the installing operation can be performed quickly. Additionally, the outflow ports 322 for causing hydraulic fluid from which bubbles have been removed to flow out and the exhaust port 333 for expelling bubbles are arranged separately so that it is possible to expose the exhaust port 333 to the drain space 127. Thus, if the hydraulic tank 1 is rocked to a large extent, the hydraulic fluid coming out of the outflow ports is not mixed with bubbles and hence bubbles can be eliminated reliably.

Description

Liquid tank

Present patent application is the application number submitted on May 22nd, the 2003 (denomination of invention: the dividing an application of application for a patent for invention liquid tank) that is 03136484.5.

Technical field

The present invention relates to a kind of liquid tank, relate in particular to a kind of liquid tank with air-vent of eliminating the bubble (air) in the liquid.

Background technology

In the past, in building machinery, generally drive as the oil cylinder of the part of working rig etc. with hydraulic oil.Thereby, building machinery has the hydraulic circuit that drives oil cylinder, but except being provided with the hydraulic pressure oil tank on this hydraulic circuit and working the pump that send hydraulic oil with tank pressure, the oil cooler that cools off hydraulic oil, control valve certainly, in order to remove the bubble in the hydraulic oil that in hydraulic circuit, produces, also be provided with air-vent sometimes.If have bubble in the hydraulic oil, then in pump, produce cavitation (cavitation), might damage pump, so will turn back to the hydraulic pressure oil tank midway from the hydraulic oil of oil cylinder etc., eliminate bubble by air-vent, send the hydraulic oil of having eliminated bubble with pump pressure again.

As air-vent multiple structure is arranged.

As the 1st example, have in hydraulic oil and to produce the stream (eddy current) that circles round, the centrifugal force by at that time focuses on center side with the bubble of light specific gravity, and comes the spiral-flow type (for example, the spy opens flat 2-52013) of separate bubbles from here by special-purpose stream.

As the 2nd example, though be spiral-flow type of the same race, but be not special-purpose stream to be set respectively come separate bubbles and hydraulic oil on the structure, but it is flowed into together in the hydraulic oil that originally just is present in the hydraulic pressure oil tank, at this moment, only the bubble with light specific gravity reaches the wall of air-vent and discharges (for example, opening clear 61-124701 branch newspaper in fact) upward.

As the 3rd example, have the stream itself that will comprise the hydraulic oil of bubble and form the whirlpool shape, by in the process of this stream, discharge the structure (for example, the spy opens clear 56-83602 communique) of the bubble that concentrates on the whirlpool central side at hydraulic oil.

But, respectively exist problem in each above-mentioned example.

Owing to be arranged on the outside of hydraulic pressure oil tank, so except that being provided with the space of hydraulic pressure oil tank, also will guarantee the space that is provided with that air-vent uses, there is the big problem of proprietary space change of oil hydraulic system in the air-vent of above-mentioned the 1st example.In addition, air-vent must be arranged on the pipe arrangement in addition, have the problem of taking time and energy in the operation being provided with.

In the air-vent of above-mentioned the 2nd example, owing to flow in bubble and the hydraulic oil of the having eliminated bubble hydraulic oil in originally just being in jar, so for example, according to the posture change of building machinery and the hydraulic pressure oil tank shake when big, the bubble that separates mixes because of shaking with hydraulic oil, and existence mixes once more and reduces the problem of eliminating performance.

In the air-vent of above-mentioned the 3rd example, be formed the whirlpool shape because be mixed with the stream of the hydraulic oil of bubble, thus eliminate bubble reliably in order to produce enough centrifugal force, and must add the diameter of Maelstrom again.Thereby air-vent integral body strengthens to the footpath of whirlpool direction, still has the problem that needs big proprietary space.

Summary of the invention

Main purpose of the present invention is to provide a kind of proprietary space that reduces to use entire system such as oil pressure, and also operation can be set easily, eliminates the liquid tank of bubble reliably.

A kind of liquid tank that is used for accommodating therein liquid, it is characterized in that in this jar, be provided with and eliminate the air-vent that is included in the bubble in the liquid, this air-vent, have in being mixed with the liquid of bubble and to produce the spin chamber of stream of circling round, and be provided with in addition respectively to make and eliminate flow export that flows out the liquid spin current chamber behind the bubble and the outlet that the bubble spin current chamber of eliminating is discharged; On this jar, be provided with the pressure and the roughly the same air-breather of ambient pressure that guarantee in the described liquid tank, described air-breather has a pair of air-breathing and air bleeding valve.

According to such liquid tank, because in this liquid tank, be provided with air-vent, so different with the air-vent of above-mentioned the 1st example, except that being provided with the space, liquid tank need not to guarantee in addition the space that is provided with that air-vent uses, the proprietary space of that part of oil hydraulic system is reduced.In addition, because by in advance air-vent being installed in the liquid tank, and needn't be arranged in addition on the pipe arrangement, so operation can promptly be set.

And, because other is provided with flow export that makes the liquid outflow of removing bubble and the outlet of discharging bubble, so compare with the air-vent of above-mentioned the 2nd example, for example, consider shaking of liquid tank etc., can draw the outlet of bubble in the position upper shed that does not mix, not worry that bubble and liquid mix once more, can eliminate reliably with liquid after the firm outflow.

Further, because have the spin chamber on the air-vent structure,, also can promote the miniaturization in proprietary space in this so, can realize pathization compared with the air-vent of above-mentioned the 3rd example with circinate stream.

In the present invention, preferably, in this jar, be provided with and guide to (liquid tank) and send oral-lateral or guide to the guide portion that is installed in the filter screen side of sending on the mouth eliminating liquid behind the bubble.

In such liquid tank, because in liquid tank, be provided with guide portion, so liquid behind the elimination bubble that flow out the spin current chamber, can not mix with the bubble of discharging, can successfully flow to send mouthful or flow to and be installed in the filter screen of sending on the mouth, send the liquid that does not contain bubble all the time and send mouth certainly.

In the present invention, preferably, guide portion, coat at least flow export around, and coat the part of the close liquid level side of above-mentioned filter screen.

In such liquid tank because guide portion coat at least flow export around, so the liquid behind the surging elimination bubble that flows out of flow export is directed to the filter screen side well.

, in the system that connects liquid tank, the self-hydraulic oil tank is supplied with the liquid of also Duoing than the liquid that turns back to liquid tank by air-vent sometimes.At this moment, the part of the underfed that returns from air-vent just sucks the liquid that is housed in advance in the liquid tank from filter screen and replenishes.Then can on liquid level produce eddy current if the liquid of filter screen sucks the position and liquid level is contiguous this moment, bubble might be involved in the liquid like this.In order to avoid the generation of this eddy current, in existing liquid tank, must guarantee the suction position of filter screen and the distance of liquid level to a certain extent.

Relative therewith, in liquid tank of the present invention, because guide portion coats the part of the close liquid level side of filter screen, so when sucking the liquid that is housed in advance in the liquid tank, filter screen sucks liquid from the part away from the liquid level side.Thereby, even under the situation of a large amount of suction liquid, do not produce the liquid that eddy current just can suck the high-quality that does not contain bubble at liquid level.In addition, like this,,, can promote the miniaturization of liquid tank so the capacity of liquid tank diminishes because, need not to guarantee the suction position of filter screen and the distance of liquid level with existing different.

In the present invention, preferably, air-vent is arranged near sending mouthful (preferably) or is arranged on and is installed on (preferably) near the filter screen of sending on the mouth.

In such liquid tank, send mouthful or be located near the filter screen that is mounted thereon because the air-vent in the liquid tank is located at, so, in this case, also can make the liquid behind the elimination bubble that the spin current chamber flows out, successfully flow to and send mouth or flow to the filter screen that is mounted thereon, and obtain and be provided with the roughly the same action effect of situation of above-mentioned guide portion.

In the present invention, preferably, air-vent, be in send mouthful directly over or be in be installed in the filter screen sent mouthful directly over, and be arranged on the filter that filters the liquid that contains bubble under.

In such liquid tank, owing to filter, air-vent, send mouthful or filter screen is configured in up and down slightly on the straight line, so can realize miniaturization to the liquid tank that contains filter.

In the present invention, preferably, the spin chamber, to have week of tubular facial and stop up a distolateral end face portion of this face in week, and above-mentioned flow export is a plurality of along being provided with near the outer circumferential side of above-mentioned end face portion.

Usually, the bubble that proportion is little, because concentrate on the cause by centre of spin chamber, so if the flow export of liquid for example is arranged on the centre of leaning on of end face portion, energy when then flowing out owing to liquid, this energy can overcome the buoyancy of bubble, makes it not to discharge and flow out from flow export with liquid from outlet.

Relative therewith, in the present invention, because flow export is provided with,, needn't worry that bubble is passed out to outside the liquid tank by former state so the bubble that is concentrated in by centre further reduces with the possibility that hydraulic oil flows out from flow export near the outer circumferential side of end face portion.

In the present invention, preferably, in this jar, be provided with the energy reduction portion of reduction from the energy of the liquid of above-mentioned flow export outflow.

If the flow export of spin current chamber is with the energy trickle of surplus, then since its energy make liquid level rise and fall big or be the ejection of water spray shape, so the time liquid level waviness and be involved in air on the liquid level again, might produce bubble.And liquid level shakes greatly, and the height of liquid level is partly descended, if be involved in gas on this position, the gas that then is involved in becomes bubble and easily is sent outside the liquid tank.

But, according to liquid tank of the present invention,, the liquid energy of outflow is reduced because on air-vent, be provided with energy reduction portion, the phenomenon that is involved in gas so be not easy the liquid level waviness takes place is eliminated bubble very reliably.

In the present invention, preferably, above-mentioned outlet is in the liquid of opening in being housed in this liquid tank.

If the spin chamber becomes negative pressure (discharging the low pressure of pressure in the place ahead than bubble) for a certain reason, then produce and to be in bubble and to discharge the air in the place ahead, go into phenomenon in the spin chamber, and to cause should be to eliminate the problem that the air-vent of bubble mixes bubble on the contrary by the outlet back suction.

Relative therewith, according to air-vent of the present invention, when becoming negative pressure, because only make existing gas (bubble) adverse current in the stream from the spin chamber to the outlet in the spin chamber, so reduced the amount of the gas of adverse current reliably, do not worried that bubble sneaks in the liquid once more.Particularly, in the time of in air-vent being located at jar,,, be effectively so the gas flow in the stream also diminishes because the length from the spin chamber to the outlet is extremely short.

In the present invention, preferably, in the discharge stream of the spin chamber that is communicated with above-mentioned air-vent and the outlet of above-mentioned bubble, be provided with the calmodulin binding domain CaM portion of combination from the numerous air-bubble of this spin chamber.

In such liquid tank, because the discharge stream that bubble passes through is provided with calmodulin binding domain CaM portion, so that grow into bigger bubble in conjunction with minute bubbles, so it is big that part of buoyancy becomes, can promptly float to liquid level from outlet, bubble is difficult to be sent from liquid tank, further improves bubble and eliminates performance.Simultaneously, carried out in conjunction with and the bubble of growing up, also former state floats to liquid level sometimes, but also sometimes from the bubble separation come-up of growing up.And the size of isolated bubble also obviously than big in conjunction with preceding bubble, floats to liquid level on still can be promptly.

In the present invention, preferably, on this jar, be provided with the pressure and the roughly the same air-breather of ambient pressure that guarantee in the liquid tank.

When the system that connects liquid tank was used on the low highland of air pressure etc., the inlet that sucks liquid and give the pump of system from liquid tank easily formed negative pressure.Under such situation, one contains airlift pump and will produce cavitation in the liquid.And in the past, on liquid tank, be provided with pressue device, prevent that the suction pressure of pump from becoming negative pressure.

Relative therewith, in liquid tank of the present invention, because eliminate bubble, so even use on the low highland of air pressure, pump can not produce cavitation yet by air-vent.Like this, because, need not pressue device,, can reduce the cost of liquid tank so needn't improve the intensity of liquid tank with existing different.In addition, do not need to be provided with the space of pressue device yet, can promote to contain the miniaturization of the system of liquid tank.

And, in liquid tank of the present invention, because be provided with air-breather, so the air in the liquid tank remains with ambient pressure roughly the same.In the past, adjust pressure in the liquid tank in prescribed limit by pressue device, but in the present invention who need not pressue device, air-breather had identical functions.Thereby, realize the work of system stability with simple structure.In addition, because air-breather only just is connected with ambient atmos during air-breathing or exhaust at needs, sneak in the liquid tank so can prevent dust etc.

Description of drawings

Fig. 1 is the front view of the liquid tank section of expression the 1st embodiment of the present invention.

Fig. 2 is the stereogram that the expression part is cut the major part that is located at the air-vent in the aforesaid liquid jar open.

Fig. 3 is the cutaway view of the air-vent of expression the 1st embodiment.

Fig. 4 is the front view of the liquid tank section of expression the 2nd embodiment of the present invention.

Fig. 5 is the side view of the liquid tank section of expression the 2nd embodiment of the present invention.

Fig. 6 is the front view of the liquid tank section of expression the 3rd embodiment of the present invention.

Fig. 7 is the side view of the liquid tank section of expression the 3rd embodiment of the present invention.

Fig. 8 is the stereogram of the air-vent of expression the 3rd embodiment.

Fig. 9 is the three-dimensional exploded view of the air-vent of expression the 3rd embodiment.

Figure 10 is the upward view of the air-vent of expression the 3rd embodiment.

Figure 11 is the cutaway view of variation that expression the present invention accommodates the mounting portion of pipe.

Figure 12 is the cutaway view of the variation of expression guide part of the present invention.

Figure 13 (A)～(H) is an ideograph of representing the variation of calmodulin binding domain CaM of the present invention portion respectively.

Figure 14 (A)～(I) is an ideograph of representing the variation of calmodulin binding domain CaM of the present invention portion respectively.

The specific embodiment

Below, based on accompanying drawing various embodiments of the present invention are described.Simultaneously, after the 2nd embodiment described later, because of the component parts in described and the 1st embodiment, identical parts and have on the parts of identical function and adopt prosign, so it is described or omit its explanation simply.

(the 1st embodiment)

Fig. 1 is the front view of hydraulic pressure oil tank (liquid tank) 1 section of expression the 1st embodiment; Fig. 2 is the stereogram that the expression part is cut the major part that is arranged on the air-vent 30 in the hydraulic pressure oil tank 1 open.

Hydraulic pressure oil tank 1 for example, is installed on the building machinery, is used to accommodate the hydraulic oil (liquid) that working rig work is used.Thereby, on this hydraulic pressure oil tank 1, except connecting not shown pump, also connecting oil cylinder, and the oil cooler etc. of not shown control valve, fabrication process machine, and utilizing these to constitute hydraulic circuit and hydraulic system through the hydraulic oil stream.

Such hydraulic pressure oil tank 1, comprise: can body 10, be housed in the filter 20 in the can body 10 and be housed in above-mentioned air-vent 30 in the can body 10 equally, filter 20 and air-vent 30 are housed in the can body 10 with the state of what is called suspention.

Specifically, can body 10, lower side at cylindrical shell 11 cylindraceous is fixed with a year oily member 12 in modes such as welding, and is fixed with ring flange 13 in upper side in modes such as welding, and can be equipped with freely loading and unloading and cover member 14 with bolt (diagram slightly) from ring flange 13 tops.

In these member of formation, carrying on the outward flange dish 121 of oily member 12, be provided with hydraulic pressure oil tank 1 integral body is bolted to the bolt perforation jack of using on the vehicle sections etc. of building machinery 122.Carrying on the sidepiece of oily member 12, what be provided with transverse opening sends mouthfuls 123, and sends on mouthfuls 123 at this, through seal (not shown) bolting the joint member 124 that is connected with outside stream is arranged.On joint member 124, one is equipped with strum (below, only be called filter screen) 125, and this filter screen 125 is housed in and carries in the oily member 12.

In addition, carrying oily member 12 inside, be provided with the oil extraction space 127 of sending space 126 and the drain flow path that is connected hydraulic machines such as hydraulic motor of accommodating above-mentioned filter screen 125, each space 126,127 is directed to portion 128 and separates.By this guide part 128, the hydraulic oil that mainly will send in the space 126 is sent to hydraulic circuit through filter screen 125, and can former state not be sent from the hydraulic oil that drain flow path is returned.

On the other hand, on lid member 14, be provided with the oil filler 141 that adds new hydraulic oil and from the return port 142 of the hydraulic return oil such as oil cylinder of working rig.Below lid member 14, be fixed with longitudinal tubule (L tubule) 143 cylindraceous in modes such as welding, the inside of longitudinal tubule (L tubule) 143 is connected with return port 142.Upper side in longitudinal tubule (L tubule) 143 contains filter 20, and in the lower side of longitudinal tubule (L tubule) 143, the state of accommodating with part is equipped with air-vent 30.

Filter 20 is constituted by flowing into from the chipware 21 of the tubular of the hydraulic oil of return port 142 and the element 22 that filters the hydraulic oil that flows out from the circular hole 211 of chipware 21.

The upper end of chipware 21 screws in the opening portion of the outflow side of return port 142.In the lower end of chipware 21, be provided with overflow valve 212, for example, when low temperature or flow become for a long time, the pressure of the inflow side of chipware 21 raises, hydraulic oil does not flow out from circular hole 211, and flows out from overflow valve 212, does not flow to the below by element 22.

Element 22 is cylindric, surrounds chipware 21 and is provided with.The lower end side of element 22, the upper end of the air-vent 30 under being configured in is supported, and is clamped in this upper end and is located between near the bracket 21A of the L font the upper end of chipware 21.

Air-vent 30 comprises: guiding elements 31 that the hydraulic oil of guiding by filter 20 flows and the cup-shaped member 32 that screws in guiding elements 31 lower ends.In addition, this air-vent 30, be positioned at filter screen 125 directly over, and be installed in filter 20 under, thereby, these filters 20, air-vent 30, and filter screen 125, by from the top down arranged in order on a straight line slightly.

The middle body of guiding elements 31 has to the cross section that upper side is protruded and is slightly cone shape solid core 311.The upper end of solid core 311, screw-in constitutes the lower end of the chipware 21 of filter 20, as mentioned above, by this upper end, comes the element 22 of supporting filter 20.And then, on the part of this upper end, be provided with the resettlement section 311A that accommodates above-mentioned overflow valve 212, flow out to the hydraulic oil of overflow valve 212, flow out to the outside of solid core 311 through through hole 311B from resettlement section 311A.

Further shown in Fig. 2 amplification, in the lower side of guiding elements 31, the periphery of surrounding solid core 311 is provided with cylindrical portion 312.The inner peripheral surface of cylindrical portion 312 is upward the conical surface that launches, and solid core 311 screws in chipwares 21, and the upper end edge portion branch of this conical surface is sealed on the peripheral edge portion of lower end side of longitudinal tubule (L tubule) 143.

The first half of these cylindrical portion 312 inboards, be and solid core 311 between the gap 313 that forms, the hydraulic oil by filter 20 flows into this gap 313.The hydraulic oil that flows into, the above-mentioned hermetically-sealed construction by cylindrical portion 312 and longitudinal tubule (L tubule) 143 can not escape to the outside.Relative therewith, be filled basically between the latter half and the solid core 311, but herein radially subtend be provided with a pair of importing stream 314.

This imports stream 314, be the upper opening 315 of open communication in gap 313 and the stream of the lower openings 317 of opening in the concavity portion 316 of solid core 311 lower end side, the hydraulic oil that enters from upper opening 315, the periphery of the downward edge solid core 311 in one side, around about quarter turn, be extruded at leisure, and enter in the concavity portion 316 from lower openings 317.

In the inside of cup-shaped member 32, be formed with spin chamber 321 with the above-mentioned concavity portion 316 of top.The lower side of cup-shaped member 32 is housed in and carries the sending in the space 126 of oily member 12, on its side face, is provided with a plurality of flow exports 322 along Zhou Fangxiang.Specifically, the spin chamber 321 that forms by cup-shaped member 32, have all facial 321A of tubular and block the end face portion 321B of the lower end side of facial 321A of this week, a plurality of (present embodiment is 4) flow export 322 is located at the lower end side of all facial 321A with about equal circumference compartment of terrain near the periphery of end face portion 321B.Simultaneously, these flow exports 322, inferior except that being arranged on all facial 231A go up in the situation of glass member that uses no bottom tube-like, also can be with the opening portion of below as flow export.

And the hydraulic oil from lower openings 317 relative concavity portions 316 tangentially flow into circles round stream downwards while produce in spin chamber 321, flow out to from flow export 322 and send in the space 126 (with reference to solid arrow).This hydraulic oil, relatively spin chamber 321 is tangentially surging flows out, but under dispose filter screen 125, and suppress widening of hydraulic oil, and by being led to filter screen 125 sides by guide part 128, successfully be inhaled into filter screen 125 after, discharge again.

At this moment, if in hydraulic oil, contain bubble by filter 20, then in being circled round in the spin chamber 321 of stream in generation, proportion is than the upper side of the obvious little bubble coalescence of hydraulic oil in central authorities, and discharges (with reference to dotted arrow) by the internal pressures in the spin chamber 321 from discharging stream 33.

At this, discharge stream 33, for being connected, concavity portion 316 and the oil extraction space 127 of carrying oily member 12 be provided with, by the internal flow path 331 to cylindrical portion 312 along horizontally set and be inserted into the outside stream 332 that the pipeline etc. of internal flow path 331 forms and formed from the top of concavity portion 316.After the bending downwards of outside stream 332, its front end is bent upwards once more.And this front end is the outlet 333 of upward opening in the hydraulic oil that originally just is present in the oil extraction space 127.

That is, in air-vent 30, the flow export 322 that the hydraulic oil after eliminating bubble flows out, also be provided with the outlet 333 that bubble is discharged usefulness in addition.In addition, because outlet 333 openings are in hydraulic oil, so when becoming negative pressure in spin chamber 321, the gas that is present in hydraulic oil liquid level top also can be from outlet 333 refluences.Thus, in the present embodiment, opening this outlet 333 in hydraulic oil itself is exactly to suppress the refluence restraining device that gas flows backwards.

In addition, shown in Fig. 3 amplifies, according to the present embodiment of outlet 333 openings in hydraulic oil, in discharging stream 33, also exist by the hydraulic oil of discharging with bubble, but the top of the top of the exit passageway 331A of the bubble of formation internal flow path 331 and the 331B of cross-drilled hole portion of level, and and then form the top of the horizontal part 332A of outside stream 332 roots, the minute bubbles that become spin current chamber 321 in the future in conjunction with and form the calmodulin binding domain CaM portion 34 of the bubble of the air pocket aggregation of growing up, minute bubbles from spin chamber 321, after the air pocket of growing up combines, separate from the bubble coalescence body by discharging the flowing of hydraulic oil in the stream 33, and discharge from outlet 333.And, when from the bubble coalescence body, separating, become bigger bubble and separate, and from outlet 333 emersion liquid level very promptly.

In the hydraulic pressure oil tank 1 of above structure, the liquid level A of hydraulic oil shown in Figure 1, the oil cylinder of expression working rig etc. is in the situation of a certain position, liquid level L, it is minimum altitude, the piston of expression oil cylinder moves to top side, carries the situation of a large amount of hydraulic oil to the bottom side of oil cylinder from hydraulic pressure oil tank 1.Liquid level H is a maximum height, and the piston of expression oil cylinder moves to bottom side, returns the situation of a large amount of hydraulic oil to hydraulic pressure oil tank 1 from the bottom side of oil cylinder.

In addition, as can be seen from Figure 1, the flow export 322 of air-vent 30, and discharge the outlet 333 of stream 33, be positioned at the below of minimum liquid level L, can keep the state of opening in hydraulic oil all the time.

Below, describing mobile gathering once more of hydraulic oil during to use hydraulic pressure oil tank 1, at first, by pump is driven, make the hydraulic oil in the hydraulic pressure oil tank 1, discharge through filter screen 125 from sending space 126, in the wrapped hydraulic circuit that contains working rig with oil cylinder etc., be back to the return port 142 on top.Here hydraulic oil is to include the situation of having sneaked into numerous air-bubble in oil cylinder etc. sometimes.

After this, comprise the hydraulic oil of bubble, flow downwards, flow into the guiding elements 31 of air-vent 30 by filter 20.Flow into the hydraulic oil of this guiding elements 31, flow into spin chamber 321, and in spin chamber 321, produce the stream that circles round from tangential direction.At this moment, the inflow of hydraulic oil, because of carrying out from a pair of lower openings 317 of footpath, edge direction subtend setting, so can successfully flow into, and also can be surging in spin chamber 321 and produce the stream that circles round effectively, and, by this stream that circles round, make bubble concentrate on the center side on top, eliminate by discharging stream 33 from here, and be discharged in the hydraulic oil that concentrates on oil extraction space 127.Further, the bubble that is discharged from, liquid level emersion upward, and sneak in the gas in the hydraulic pressure oil tank 1.On the other hand, eliminate the hydraulic oil of bubble, flow out to from flow export 322 and send space 126, the filter screen 125 under is discharged from once more certainly.

But oil cylinder piston moves to top side, essential a large amount of hydraulic oil, and only send into the hydraulic oil that flows out from air-vent 30 once more when not enough, the hydraulic oil that originally is in the hydraulic pressure oil tank 1 also is sent.At this moment, for example, liquid level drops to liquid level L.Relative therewith, piston moves to bottom side and only when hydraulic pressure oil tank 1 is sent a spot of hydraulic oil, the hydraulic oil that flows out from air-vent 30 can't all be discharged from once more, and is accommodated in the hydraulic pressure oil tank 1 for the time being.At this moment, for example, liquid level reaches liquid level H.

In addition, in such hydraulic pressure oil tank 1, when changing the element 22 of filter 20, after unloading lower cover member 14 it being taken out, rotate air-vent 30, and the chipware 21 of the filter 20 of outwarding winding and screwing togather of lid member 14, air-vent 30 is pulled down from longitudinal tubule (L tubule) 143 with this filter 20, then, rotate air-vent 30 once more and pull down air-vent 30, filter 20 is extracted from chipware 21 changed from chipware 21.When after replacing, assembling, as long as just passable by its opposite order assembling.

Simultaneously, when air-vent 30 is pulled down from covering member 40 with filter 20,, take off chipware 21 from lid member 14, but earlier air-vent 30 is not taken off from chipware 21 before this by rotation air-vent 30.

According to such present embodiment, can obtain following effect.

(1) in hydraulic pressure oil tank 1, because portion is provided with air-vent 30,, can reduce the private space of branch oil hydraulic system within it so need not to guarantee in addition the space that is provided with of air-vent 30 usefulness the space except being provided with of hydraulic pressure oil tank 1, in addition, can promote the miniaturization of building machinery thereupon.

(2) in addition, by in advance air-vent 30 being installed in the hydraulic pressure oil tank 1, and need not it is arranged on the pipe arrangement of hydraulic oil stream in addition, operation can be set rapidly.

(3) and, in air-vent 30, make the hydraulic oil of eliminating behind the bubble flow out the flow export 322 of usefulness and discharge the outlet 333 that bubble is used owing to be provided with in addition,, and can import to also opening of another oil extraction space 127 so outlet 333 is not opened in sending space 126.Thus, for example, even because of the building machinery run-off the straight, and it is very big that hydraulic pressure oil tank 1 is shaken, and also do not worry flowing out back hydraulic oil and bubble and mix at once, can eliminate bubble reliably.

At this moment, because outlet 333 opening is upward discharged property so can have good bubble, can successfully make the bubble emersion to liquid level.

(4) and, air-vent 30 because have the spin chamber 321 that hydraulic oil is produced circle round stream, so compare with make the hydraulic oil air-vent of eliminating bubble that flows in circinate stream, can be realized further miniaturization.Also can promote narrow and smallization in proprietary space in this.

(5) carry the guide part 128 of oily member 12, not only separate and send space 126 and oil extraction space 127, and have the liquid that makes behind the elimination bubble that flows out from spin chamber 321, do not mix and flow to the guiding function of filter screen 125 with the bubble of discharging, thus, can send smoothly and reliably from the hydraulic oil that outlet will not contain the high-quality of bubble all the time.

(6) because air-vent 30 is arranged on (preferably) near the filter screen 125, so, also can make hydraulic oil 321 that flow out from the spin chamber, that eliminate behind the bubble successfully flow to filter screen 125 even in this.

(7) in hydraulic pressure oil tank 1 because filter 20, air-vent 30, and filter screen 125 be configured in along the vertical direction slightly on the straight line, so can realize accommodating the miniaturization of the hydraulic pressure oil tank 1 of these devices reliably.

(8) in air-vent 30, because the flow export 322 side settings at hydraulic oil do not prevent backflow device, and the outlet 333 that is provided in a side of discharge stream 33 sides of bubble plays a role as suppressing backflow device, suppress adverse current in view of the above to the gas of spin chamber 321, so hydraulic oil successfully can be flowed out without hindering to wait from flow export 322, and can prevent from spin chamber 321, to produce high negative pressure.Like this, as oil hydraulic system, the system internal pressure is also less high and can suppress the pressure loss, also can use small-sized pump or oil cooler etc., and, the fuel availability when realize improving system works, and reduce manufacturing cost, thereby, energy-conservationization and the cost degradation of promotion building machinery.

(9) at this moment, because with outlet 333 openings of bubble in hydraulic oil, these outlets 333 itself are played a role as the adverse current restraining device, so need not big device as the adverse current restraining device, and can further promote around the spin chamber 321 and the miniaturization of hydraulic pressure oil tank 1 etc., and can realize further narrow and smallization of the private space of hydraulic system.

(10) and, because 321 when becoming negative pressure, exist only in the gases (bubble) of discharging in the stream 33 and carry out adverse current,, and prevent from hydraulic oil, to sneak into once more bubble effectively so can reduce the gas flow of adverse current reliably in the spin chamber.

(11) particularly, in the present embodiment that air-vent 30 is located in the hydraulic pressure oil tank 1, because can be with 321 length to the discharge stream 33 of outlet 333 are provided with extremely shortly from the spin chamber, so the amount of discharging the gas in the stream 33 also seldom, and effect be better.

(12) because on the discharge stream 33 of air-vent 30, be provided with calmodulin binding domain CaM portion 34, the minute bubbles be combined into of spin current chamber 321 is long in the future is very big bubble coalescence body, and air pocket separates discharge from this bubble coalescence body, so its minute buoyancy change is big, can be promptly from outlet 333 emersions to liquid level, and make bubble be difficult to from hydraulic pressure oil tank 1, send, further improve bubble and eliminated performance.

(13) owing to make eliminate a plurality of flow exports 322 that the hydraulic oil behind the bubble flows out from spin chamber 321, be arranged on along Zhou Fangxiang near the periphery of the end face portion 321B that is formed at 321 bottoms, spin chamber, flow out from flow export 322 with hydraulic oil so can suppress to focus on the bubble of a central side, can prevent reliably further that the bubble former state from flowing out to filter screen 125 sides.

(the 2nd embodiment)

Below, the 2nd embodiment of the present invention is described.The 2nd embodiment, different with the form of guide part 128 among the 1st embodiment, and on hydraulic pressure oil tank 1, air-breather is installed.Fig. 4 is the front view of hydraulic pressure oil tank 1 section of the 2nd embodiment, and Fig. 5 is a side view.At this, Fig. 4 is the IV-IV cutaway view of Fig. 5.

As shown in Figure 4, the lower side at the cylindrical shell cylindraceous 11 of can body 10 is equipped with simple discoid base plate 11A with methods such as welding, contains hydraulic oil in the inside of can body 10.In addition, what be provided with transverse opening on the side of the bottom of cylindrical shell 11 sends mouthfuls 123, sends on mouthfuls 123 at this filter screen 125 and joint member 124 are installed.

Simultaneously, cylindrical shell 11 except that adopt cylindric, also can adopt shape arbitrarily such as square tube shape, oval tubular.Because improved intensity when cylindric in that cylindrical shell 11 is formed, so but the wall thickness of attenuated tank main body 10, and can not need as former necessary reinforcement.In addition, can cheaply make can body 10 like this.

Above longitudinal tubule (L tubule) 143, be provided with diameter the filter resettlement section 143A that round-ended cylinder shape arranged bigger than longitudinal tubule (L tubule) 143.In the bottom side of this filter resettlement section 143A, longitudinal tubule (L tubule) 143 upper ends are installed integratedly also connect with it.The inside of filter resettlement section 143A and longitudinal tubule (L tubule) 143 is connected like this.In addition, in the upper end of filter resettlement section 143A, be formed with flange part 143B, this flange part 143B is entrenched in the inboard of the ring flange 13 of can body 10 sides.Flange part 143B is configured between ring flange 13 and the lid member 14 by seal, and fixes by bolt (not shown) from the top of lid member 14.Thereby return port 142 is connected with filter resettlement section 143A and longitudinal tubule (L tubule) 143.

In the inside of filter resettlement section 143A, dispose cylinder filter 20.The lower end of filter 20 is set on the bottom surface of filter resettlement section 143A, in the upper end of filter 20, and the lower end of butt joint spring 213.The upper end of this spring 213 connects with lid member 14, and utilizes the elastic force of stipulating filter 20 to be pressed on the bottom surface side of filter resettlement section 143A.

In addition, the upper end of the hollow space of filter 20 is stopped up by the overflow valve 212 that is accommodated in the filter 20.Overflow valve 212, inside have not shown valve and spring, valve are carried out compressing by the elastic force of regulation.

At this, filter resettlement section 143A, different with the 1st embodiment, be provided with as another member for lid member 14.By such structure, when changing filter 20, only take off and cover member 14 and just can change filter 20 simply.

In the present embodiment, as Fig. 4 and shown in Figure 5, be provided with and be coated on around the air-vent 30, and coat the guide part 129 of part of the close liquid level side of filter screen 125.Guide part 129 has eddy flow side guide part 129A cylindraceous on every side that coats flow export 322 and the filter side guide part 129B that coats filter screen 125 the first half.

Eddy flow side guide part 129A, the upper end is fixed on the longitudinal tubule (L tubule) 143 with bolt (not shown), and coats air-vent 30 integral body.This eddy flow side guide part 129A, also coat be configured in air-vent 30 under a part of filter screen 125.

On the other hand, filter side guide part 129B, an end is fixed on the joint member 124, and the other end is configured in the inside of eddy flow side guide part 129A.

Simultaneously, in the present embodiment, be arranged on the outlet 333 on the air-vent 30, be configured in the position more taller, be opened in the air all the time than the liquid level of hydraulic oil.In the front of outlet 333, be provided with prevent adverse current, adverse current restraining device 334 such as for example test valve.This adverse current restraining device 334 when becoming negative pressure (discharging the low pressure of the place ahead pressure than bubble) in spin chamber 321, prevents air from outlet 333 adverse currents, like this, can suppress bubble and sneak into once more in the hydraulic oil in the spin chamber 321 of having eliminated bubble.

As shown in Figure 5, on can body 10, be provided with the air that guarantees in the hydraulic pressure oil tank 1 and press and the roughly the same air-breather 15 of ambient atmos pressure.Air-breather 15 has the pipe 151 that is opened in the ambient atmos, like this, hydraulic pressure oil tank 1 inside can be connected with ambient atmos.In air-breather 15 inside, be provided with the valve that can be communicated with/cut off the path that connects hydraulic pressure oil tank 1 inside and ambient atmos.Valve is compressed by spring etc., if the difference of the pressure in ambient atmos pressure and the hydraulic pressure oil tank 1 surpasses prescribed limit, then is communicated with hydraulic pressure oil tank 1 and manages 151.This valve is provided with 2 kinds, respectively configuration switch pressure.For example, if the pressure in the hydraulic pressure oil tank 1 reaches the setting pressure of a valve, then the air in the hydraulic pressure oil tank 1 is opened, discharged to this valve.And, if the pressure in the hydraulic pressure oil tank 1 reaches the setting pressure of another valve, then open this another valve and suck air in hydraulic pressure oil tank 1.

In such hydraulic pressure oil tank 1, return next hydraulic oil from return port 142,143A inside, inflow filter resettlement section, while pass through from inwardly all filtration of the periphery of filter 20, and flow to longitudinal tubule (L tubule) 143.Afterwards, in air-vent 30, the identical bubble of eliminating with the 1st embodiment.The bubble that is eliminated is discharged in the air in the hydraulic pressure oil tank 1 by adverse current restraining device 334 and outlet 333.And on the other hand, shown in the dotted arrow among Fig. 4 and Fig. 5, eliminated the hydraulic oil of bubble, and from flow export 322 surging outflows, import filter screen 125 by eddy flow side guide part 129A, be sent to hydraulic circuit again.At this, when exceeding setting owing to certain reason filter resettlement section 143A pressure inside, overflow valve 212 is opened.Like this, the hydraulic oil in the 143A of filter resettlement section is opened road direction longitudinal tubule (L tubule) 143 to filter 20 as the side and is flowed into.

Because of the cylinder action of hydraulic circuit, and need a large amount of hydraulic oil, but only send into the hydraulic oil that flows out from air-vent 30 once more when not enough, must also the hydraulic oil that originally be in the hydraulic pressure oil tank 1 be sent.At this, shown in the solid arrow of Fig. 4 and Fig. 5, hydraulic oil never disposes a side of guide part 129, that is, flow in the filter screen 125 with the downside that liquid level deviates from mutually.At this moment, the liquid level of hydraulic oil reduces to L.In addition, otherwise, when essential a spot of hydraulic oil is only arranged, return the hydraulic oil that comes from return port 142, be back in the hydraulic pressure oil tank 1 by air-vent 30, this moment, liquid level was increased to H.

Different with existing liquid tank, the hydraulic pressure oil tank 1 of present embodiment is not because have pressue device, so the adjustment of the pressure in the hydraulic pressure oil tank 1 realizes by air-breather 15.If the liquid level in the hydraulic pressure oil tank 1 rises to the H side, improved the pressure in the hydraulic pressure oil tank 1, then the valve of air-breather 15 inside is opened hydraulic pressure oil tank 1 is connected with pipe 151, and air is discharged to the outside.Otherwise, if the liquid level in the hydraulic pressure oil tank 1 descends to the L side, reduced the pressure in the hydraulic pressure oil tank 1, then another valve of air-breather 15 inside is opened, and air is sucked in hydraulic pressure oil tank 1 from managing 151.

According to the 2nd such embodiment, except can obtain with (1), (2) of the 1st embodiment, (4), (6), (7), (8), (11), and the identical effect of the effect of (13), also can obtain following effect.

(14) because around flow export 322, be provided with eddy flow side guide part 129A, and also be provided with filter side guide part 129B, so the hydraulic oil of eliminating behind the bubble directly is directed in the filter screen 125 in part near the liquid level side of filter screen 125.Thereby can efficiently the hydraulic oil of high-quality be delivered to hydraulic circuit again.

In addition, in hydraulic pressure oil tank 1, send into the hydraulic oil of being accommodated, even the liquid level in the hydraulic pressure oil tank 1 descends to the L side, because filter side guide part 129B coats the side near liquid level, so hydraulic oil also can only be supplied with from the below of filter screen 125.Thereby,, also can prevent the generation of the whirlpool of liquid level even filter screen 125 sucks hydraulic oil in large quantities.Because can not cause bubble to sneak in the hydraulic oil by whirlpool takes place, so, under which kind of condition, all the hydraulic oil of high-quality normally can be delivered to pump.

(15) because can prevent eddy current, so can reduce the liquid level of setting the hydraulic oil in the hydraulic pressure oil tank 1 by filter side guide part 129B.Thereby, promote the miniaturization of hydraulic pressure oil tank 1.

(16),, also can prevent the cavitation of pump so, easily produce at pump intake under the situation of negative pressure and carry out operation even air pressure such as eminence are low because can eliminate bubble by air-vent 30.Thereby, can prevent to damage pump.In addition, like this, just do not need existing necessary pressue device, the space that can reduce the entire system of hydraulic circuit.And, because need not pressue device,, can cheaply make hydraulic pressure oil tank 1 so there is no need to set the intensity of hydraulic pressure oil tank 1 very high.

(17) because on hydraulic pressure oil tank 1, be provided with air-breather 15, so can adjust in the hydraulic oil jar 1 all the time near ambient atmos pressure.Thereby, even, also the air pressure variations in the hydraulic pressure oil tank 1 can be controlled in the prescribed limit because of the liquid level that makes in the hydraulic pressure oil tank 1 that moves of hydraulic oil changes.In a word,, can prevent that also the air in the hydraulic pressure oil tank 1 from becoming negative pressure even when liquid level is in L, and well to pump delivery hydraulic pressure oil.In addition, even because liquid level when being in H, can not cause the air pressure in the hydraulic pressure oil tank 1 excessive yet, so can prevent hydraulic pressure oil tank 1 damage, reduce the life-span.That is, former, utilize bigger pressue device to carry out such pressure adjustment, and in the present embodiment, so that air-breather 15 to be installed, available simple structure play same effect.

In addition because only where necessary switch valve carry out air-breathing, exhaust, so can prevent from hydraulic pressure oil tank 1, to sneak into rubbish or dust.This point is particularly useful when the hydraulic pressure oil tank is used under building machinery etc., outside rugged environment.

(18) because flange part 143B and ring flange 13 tablings, and be fixed by bolts to from top and cover on the member 14, so when replacing filter 20, covered member 14 as long as open.In a word, because need not to take off together the longitudinal tubule (L tubule) 143 that air-vent 30 is installed, be easy to change filter 20.

(the 3rd embodiment)

Below, the 3rd embodiment of the present invention is described.The 3rd embodiment, filter screen 125 towards different with the 1st, the 2nd embodiment.In addition, there are not to use the member that is equivalent to the guide part 128,129 among the 1st, the 2nd embodiment, the energy reduction portion 75 that is provided with of replacement on air-vent 30.But, also such guide part 128,129 can be used with energy reduction portion 75.

Further, in the present embodiment, the form of air-vent 30 and the 1st embodiment difference are very big.Fig. 6 is the front view of hydraulic pressure oil tank 1 section of the 3rd embodiment, and Fig. 7 is a side view.Fig. 8 to Figure 10 is respectively stereogram, three-dimensional exploded view, and the upward view of major part of employed in the present embodiment air-vent 30.

In Fig. 6, Fig. 7, at first, hydraulic oil to pump side send mouthfuls 123, be arranged on the base plate 11A of hydraulic pressure oil tank 1, following, joint member 124 and filter screen 125 are installed along vertical direction up and down.In addition, air-vent 30 not in the top of filter screen 125 (send mouthful 123), and is configured in along on the position that transverse direction staggers, and the lower side of air-vent 30 is positioned at the below slightly on filter screen 125 tops.In addition, the outlet 333 of the bubble of air-vent 30 is positioned at a side that deviates from mutually with filter screen 125, and the bubble of discharging from outlet 333 is not easy in the strum 125.

In Fig. 6 to Figure 10, air-vent 30, different with the 1st embodiment, be type, so that the hydraulic oil that returns from the hollow bulb of filter 20 cylindraceous flows into the center upper portion of air-vent 30 with solid core 311 (Fig. 1).

Specifically, air-vent 30 is by the 1st following member 60 that is bolted to lower flange dish 143C set on the longitudinal tubule (L tubule) 143 be bolted to the lower side of the 1st member 60 and the 2nd members 70 that top is housed in the 1st member 60 constitute.

The 1st member 60 is has lid cylindric, and part is provided with the hydraulic oil input channel 61 of the concavity of depression downwards in the above.In the upper interior of this input channel 61, be provided with along a flow direction transformation component 62 of the footpath direction and the evagination that makes progress.The surface of flow direction transformation component 62 is formed by smooth curved surface, and the hydraulic oil that runs down into input channel 61 from the top is shunted to two directions as boundary with flow direction transformation component 62.In addition, on the inner peripheral surface of input channel 61, be provided with a pair of side mouth 63 that is the slotted hole shape along Zhou Fangxiang, will import in these side mouth 63 by the hydraulic oil of flow direction transformation component 62 shuntings along footpath direction subtend.Further, on the hollow space of the 1st member 60 integral body, also be provided with a pair of depression and make the importing stream formation portion 64 of wall thickness attenuation along footpath direction subtend on the side face within it, these import stream formation portions 64 and are connected with above-mentioned side mouth 63.

On the other hand, the 2nd member 70 is bottom tube-like, has the importing stream that protrudes upward at an upper portion thereof and forms wall 71.Importing stream at this forms on the outer peripheral face of wall 71, be provided with a pair of guide portion of protruding laterally 72 along footpath direction subtend, when importing stream formation wall 71 was inserted into the hollow space of the 1st member 60, its guide portion 72 embedded in the importing stream formation portion 64 of the 1st member 60.And, by stream forms portion 64, the importing stream forms wall 71, reaches the space that guide portion 72 is surrounded by importing, formation is the lead importing stream 314 of spin chamber's 321 usefulness of hydraulic oil, and the side mouth 63 of hydraulic oil by the 1st member 60 sides flows into and import in the streams 314.At this moment, the upper part of guide portion 72, distolateral to the high-dipping of other end side direction below from Zhou Fangxiang reaches with slightly certain thickness up and down and to be nick shaped and to be located at and to import stream and form inflow entrance 73 on the wall 71.Thereby, flow into the hydraulic oil that imports in the stream 314, utilize its sloping portion to be directed to inflow entrance 73, and flow into spin chamber 321 from tangential direction along Zhou Fangxiang.

, on the 1st member 60, in flow direction transformation component 62 corresponding positions on be formed with the 331B of cross-drilled hole portion, and be connected with exit passageway 331A.On the thick wall part of the barrel of the 1st member 60, be formed with vertical hole portion 331C, and with distolateral being connected of the 331B of cross-drilled hole portion.And another distolateral stopper etc. that utilizes of the 331B of cross-drilled hole portion seals.

Relative therewith, on the protuberance 74 on all facial 321A that is arranged at the 2nd member 70 from top to bottom, run through and be provided with from downward vertical hole portion 331D of mounting flange 70A and the 331E of angling hole portion that tilts from the top down communicatively with the lower end of vertical hole portion 331D, when the 1st, the

2nd member

60,70 was combined, the upper end of vertical hole portion 331D was connected with the vertical hole portion 331C of the 1st member 60 sides.In addition, the opening portion of the 331E of angling hole portion becomes the outlet 333 of bubble.

And, by each 331A～331E of hole portion, form the discharge stream 33 of bubble.Such discharge stream 33 is integrally formed in the air-vent 30, and be not provided with the 1st embodiment such wait the outside stream 332 (Fig. 2, Fig. 3) form by pipe.

In the lower side of the 2nd member 70, be provided with the energy reduction portion 75 of the outside protrusion of radius vector direction.This energy reduction portion 75, mode with the flow export 322 that coats hydraulic oil is provided with, the following lappet portion 77 that has along the continuous convex shoulder 76 of all facial 321A of the 2nd member 70 with from the convex shoulder that 76 ora terminalis lets droop, the following 77 first-class circle spacings of lappet portion be provided with a plurality of (being 4 in the present embodiment) breach 78.As shown in figure 10, these breach 78, with position that flow export 322 staggers mutually on be provided with a plurality of (being 4 in the present embodiment), hydraulic oil from flow export 322 outflows, be not directly by expanding behind the breach 78, in case bump against down in the lappet portion 77, energy just reduces, after this, from breach 78 or down the diffuse underneath of lappet portion 77 in hydraulic pressure oil tank 1.At this moment, in the present embodiment, flow export 322 is the shape along direction of rotation in spin chamber 321, and carry out opening across facial 321A of week and end face portion 321B (Figure 10), one side 321 does not flow out on sinuous flow ground hydraulic oil from the spin chamber, one side is collided energy after the reduction outflows with following lappet portion 77 reliably.Simultaneously, such energy reduction portion 75 except one is located on the air-vent 30, also can be arranged with air-vent in 30 minutes, was installed on the inner peripheral surface of hydraulic pressure oil tank 1.

According to present embodiment, since different with above-mentioned the 1st, the 2nd example structure, so have following effect.

(19) promptly,, be provided with the energy reduction portion 75 of the energy of the hydraulic oil after reduction is flowed out from flow export 322, so can not make liquid level rise and fall very big or be the diffusion type ejection because of the energy of the hydraulic oil that flows out from flow export 322 because on air-vent 30.Thereby, can not produce the liquid level waviness and be involved in air on the liquid level again, also the angry bubble of difficult labour is eliminated bubble very reliably.

(20) because in this air-vent 30, the discharge stream 33 of bubble all is formed in the device, the outside stream 322 (Fig. 2, Fig. 3) that does not have the 1st embodiment, so need not independently pipeline that forms such outside stream 322 usefulness etc., can reduce number of components and assembling procedure and reduce cost.

(21) owing on input channel 61 set on the 1st member 60 of air-vent 30, be provided with flow direction transformation component 62, so can with enter the hydraulic oil of the central authorities of the 1st member 60, at flow direction transformation component 62 reliably to two directions shuntings, thereby hydraulic oil is successfully imported in the stream 314.

(variation)

Simultaneously, the present invention is not limited to the various embodiments described above, also comprises realizing other formation etc. of purpose of the present invention, and distortion shown below etc. is also contained in the present invention.

For example, in the 2nd, the 3rd embodiment, be provided with filter resettlement section 143A on the top of longitudinal tubule (L tubule) 143 because separate setting with lid member 14, so only open cover member 14 only from the top with regard to replaceable filter 20, but be not limited to such structure.

For example, as shown in figure 11, also can be longitudinal tubule (L tubule) 143 from covering the structure of separating on the member 14 and being supported on can body 10 sides etc.

In this Figure 11, lid member 14 and longitudinal tubule (L tubule) 143 as mutually independently member be provided with, the upper end of longitudinal tubule (L tubule) 143, the seal 51 by ring-type be docked at cover member 14 below.In addition, the chipware 21 of filter 20 also is docked at by seal 52 and covers on the member 14.Differently with the 1st embodiment be not threaded into.Further, the above-below direction of longitudinal tubule (L tubule) 143 midway on be provided with the outward flange dish portion 53 of ring-type, this outward flange dish portion 53 is carried in the inner flange portion 54 on the interior week of being located at cylindrical shell 11.In addition, in inner flange portion 54, be provided with the hydraulic oil that makes supply notch part usefulness, peristome 55 or arbitrary shape etc. that flows downwards.

By above structure, from the structure that the center side of filter 20 is filtered laterally, cover member 14 at the hydraulic oil that returns as long as take off, just can pull down chipware 21 or element 22 in the longitudinal tubule (L tubule) 143, do not load and unload air-vent 30 and just can change.

In the 1st embodiment, the outlet 333 of discharging bubble by opening in hydraulic oil, outlet 333 itself has the function of the adverse current restraining device of gas, but, also can constitute as the adverse current restraining device, for example, constitute by test valve that is located at outlet 333 sides such among the 2nd embodiment etc. by other structures, in this case, almost completely do not have the gas of adverse current.

But this adverse current restraining device is not the necessary structure of the present invention, preferably is provided with as required.

In addition, can body 10, filter 20, and the concrete shape or the structure of air-vent 30 etc. are not limited to the various embodiments described above, in actual applications, can at random change under the object of the invention prerequisite realizing.

For example, in the various embodiments described above, filter 20 and air-vent 30 are housed in the hydraulic pressure oil tank 1, even but filter 20 is arranged on the outside of hydraulic pressure oil tank 1, also contained by the present invention.

Filter screen 125 in the various embodiments described above should be provided with as required, can omit according to the structure of hydraulic pressure oil tank.But, when filter screen 125 not being set, wish send mouthfuls 123 near, air-vent 30 is set directly over being preferably in.Otherwise, when being provided with filter screen 125, wish near the filter screen 125, directly over being preferably in air-vent 30 to be set.The position of sending mouth 123 of this moment also can be selected arbitrarily.

Promptly, air-vent 30, be positioned at send mouthfuls 123 or filter screen 125 directly over, hydraulic oil flow aspect on be best, but be not can only send mouthfuls 123 or filter screen 125 directly over, even be configured near the position of staggering a little,, just can obtain the effect of above-mentioned (5) as long as less than the degree that flows that hinders hydraulic oil roughly the samely.

In the 1st embodiment, guide part 128 has guiding function, and guide part 129 has guiding function in the 2nd embodiment, will guide to filter screen 125 sides from the hydraulic oil that air-vent 30 flows out, but be not limited to this as guide portion.

For example, as shown in figure 12, guide portion 128 is integrally formed on year oily member 12 with the spaced apart spacer portion 128A that sends space 126 and oil extraction space 127, and above the flow export 322 of air-vent 30, has another spacer portion 128B that slightly be arranged in parallel with liquid level.In addition, in the bottom of spacer portion 128A one side, be provided with the intercommunicating pore 128C that space 126 and oil extraction space 127 are sent in connection.At this moment, outlet 333 is identical with the 2nd embodiment to be opened in the air all the time, and has adverse current restraining devices 334 such as test valve on the front.

In such structure, also identical with the 2nd embodiment, the hydraulic oil behind the elimination bubble is directed to filter screen 125 sides by spacer portion 128A and another spacer portion 128B.And the bubble that is eliminated is discharged in the air by adverse current restraining device 334 and outlet 333.Because when needing a large amount of hydraulic oil, because it is spaced apart by another spacer portion 128B to send the upper side in space 126, and hydraulic oil mainly is padded to filter screen 125 by intercommunicating pore 128C from the below in oil extraction space 127, so can prevent the liquid level eddy generation.At this moment, different with the 1st embodiment, the bubble that is eliminated does not mix with the hydraulic pressure oil phase in oil extraction space 127 in outlet 333 is discharged to air on the liquid level.Thereby the hydraulic oil with high-quality guides in the filter screen 125 all the time.

In above-mentioned the 1st, the 2nd embodiment, filter screen 125 and send mouthfuls 123, the axle of air-vent 30 setting that meets at right angles relatively, but be not limited thereto.For example, also can with send mouthfuls 123 be located at air-vent 30 under, with filter screen 125 and filter 20 and spin chamber 321 be configured in coaxial on.At this moment, in the 2nd embodiment, also filter screen side guide 129B can be set, and in around the side guide 129A of the spin chamber coating flow export 322, coating is near the part of the liquid level on the top of filter screen 125.In such structure, the spin chamber's hydraulic oil of side guide 129A after will eliminating bubble guides in the filter screen 125, when a large amount of hydraulic oil of needs, can suck from the lower end of the side guide 129A of spin chamber again, identical with the 2nd embodiment thus, can prevent the eddy generation on liquid level.

In above-mentioned the 1st, the 2nd embodiment, on exit passageway 331A, the 331B of cross-drilled hole portion or horizontal part 332A of the discharge stream 33 that is formed with air-vent 30, be provided with the calmodulin binding domain CaM portion 34 of bubble.But this calmodulin binding domain CaM portion 34 is provided with the position, shown in Figure 13 (A)～Figure 13 (H) and Figure 14 (A)～Figure 14 (I), also can consider to discharge the shape of stream 33 and form position etc. and decide arbitrarily.Simultaneously, in these each figure, omitted the diagram of the flow export of the inflow entrance (lower openings) of the hydraulic oil in the spin chamber or spin current chamber, but be located at basically on the position identical with the various embodiments described above.In addition, in Figure 14 (A)～Figure 14 (I), be the structure that bubble is discharged from the end face portion of the bottom side of spin chamber.And, more than, especially, the calmodulin binding domain CaM portion 34 shown in Figure 13 (B), Figure 13 (C), Figure 13 (D), Figure 13 (H) and Figure 14 (C), Figure 14 (E) can form the bubble coalescence body energetically, is effectively.

Further, though omitted diagram, the discharge stream 33 as being provided with calmodulin binding domain CaM portion 34 is not limited to outlet 333 openings in hydraulic oil, also can be opened in the gas in the hydraulic pressure oil tank 1.Promptly, for example, also can be as the shape of the discharge stream 33 among Figure 13 (C), and front end extends upward, outlet 333 (symbol in the drawings omits) is opened in the gas, even very successfully floating in these discharge streams 33, this situation, bubble that can change is big in discharging stream 33 be released in the gas.

As the various embodiments described above, liquid of the present invention is the hydraulic oil that is used on the oil hydraulic system of building machinery, but is not limited thereto as the liquid of handling in liquid tank of the present invention, also applicable to water or other liquid arbitrarily.Certainly, just use the system of liquid tank, except the oil hydraulic system of oil pressure etc., also can use liquid tank of the present invention in the system arbitrarily in the waste liquid storage system with waste liquid tank or effluent purifying system, from the fuel injection system of fuel tank force feed burner oil etc.

The structure of the optimum that enforcement the present invention uses, method etc. disclose in above record, but the present invention is not limited thereto.Promptly, the present invention, relating generally to certain embodiments illustrates especially, and be illustrated, but, do not detach the scope of technological thought of the present invention and purpose, at above-described embodiment, in shape, material, quantity, and on other constitute in detail, in addition various distortion of those skilled in the art.

Thereby, because limit the record of above-mentioned disclosed shape, material etc., be for understanding the record that the present invention's illustration ground carries out easily, not delimit the scope of the invention, so, all contained by the present invention for to leave record those shapes, material etc., that part or all the title of member of qualification is done.

Claims

1. liquid tank is characterized in that:

In this jar (1), be provided with and eliminate the air-vent (30) that is included in the bubble in the liquid,

This air-vent (30), constitute by first member (60) of upper side and second member (70) that is fixed in the lower side of described first parts, has the spin chamber (321) that in being mixed with the liquid of bubble, produces the stream that circles round, and be provided with in addition respectively to make and eliminate the flow export (322) that flow out the liquid spin current chamber (321) behind the bubble, outlet (333) with bubble spin current chamber (321) discharge that will eliminate, described spin chamber has the outer circumferential side in the week facial (321A) of the tubular of being located at described second parts, and described flow export (322) and described outlet (333) both sides all are located at described second member (70).

2. liquid tank is characterized in that:

This air-vent (30), constitute by first member (60) of upper side and second member (70) that is fixed in the lower side of described first parts, has the spin chamber (321) that in being mixed with the liquid of bubble, produces the stream that circles round, and be provided with in addition respectively to make and eliminate flow export (322) that flows out the liquid spin current chamber (321) behind the bubble and the outlet (333) that the bubble spin current chamber (321) of eliminating is discharged

Described spin chamber has the outer circumferential side in the week facial (321A) of the tubular of being located at described second parts, described first member (60) be provided be located at facial outer circumferential side of described week be used for described liquid import described spin chamber a pair of importing stream (314) and will be from the described liquid of top flow direction transformation component (62) to described a pair of importing stream (314) shunting.

3. liquid tank is characterized in that:

Described spin chamber has the week facial (321A) of the tubular of being located at described second parts, described first member (60) is provided with a pair of importing stream (314) that is used for described liquid is imported described spin chamber at described all facial outer circumferential sides, is provided with the distolateral guide portion (72) that tilts to other end side direction below from Zhou Fangxiang in described importing stream (314).

4. liquid tank is characterized in that:

Described spin chamber has the week facial (321A) of the tubular of being located at described second parts, and described flow export (322) and described outlet (333) are located on described second member (70),

Described first member (60) is provided with a pair of importing stream (314) that is used for described liquid is imported described spin chamber of being located at facial outer circumferential side of described week, with will be from the described liquid of top flow direction transformation component (62) to described a pair of importing stream (314) shunting

In described importing stream (314), be provided with a distolateral guide portion (72) that tilts to other end side direction below from Zhou Fangxiang.

5. according to any described liquid tank (1) of claim 1～4, it is characterized in that,

Described spin current chamber (321) has blocks a facial distolateral end face portion (321B) of described week, along a plurality of described flow exports (322) are set near the outer circumferential side of described end face portion (321B).

6. according to any described liquid tank (1) of claim 1～4, it is characterized in that,

The liquid split shed of described outlet (333) in being contained in described liquid tank (1).