CN102619743A - Distributing valve, pumping system and engineering machinery - Google Patents
Distributing valve, pumping system and engineering machinery Download PDFInfo
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- CN102619743A CN102619743A CN2012101126949A CN201210112694A CN102619743A CN 102619743 A CN102619743 A CN 102619743A CN 2012101126949 A CN2012101126949 A CN 2012101126949A CN 201210112694 A CN201210112694 A CN 201210112694A CN 102619743 A CN102619743 A CN 102619743A
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Abstract
The invention provides a distributing valve. The distributing valve comprises a drive mechanism, a first valve body, a second valve body, a first valve plug and a second valve plug, wherein the first valve plug and the second valve plug are arranged in the first valve body and the second valve body respectively; the first valve body is provided with a first valve port and a second valve port which are communicated through the valve cavity; the second valve body is provided with a third valve port and a fourth valve port which are communicated through the valve cavity; the drive mechanism can drive the first valve plug and the second valve plug to synchronously move; when the first valve plug is used for closing the first valve port, the third valve port is opened; and when the second valve plug is used for closing the third valve port, the first valve port is opened. The invention also provides a pumping system and engineering machinery. According to the distributing valve, the pumping system and the engineering machinery, the aims of sucking materials and pumping can be filled by means of the two valve plugs, and the distributing valve has a simple structure, reliably distributes, saves the cost and can save assembly space. One drive mechanism is used for synchronously driving the two valve plugs, a control system is greatly simplified, the weight of the whole machine is reduced, and the distributing valve is convenient to assemble and transport.
Description
Technical field
The present invention relates to engineering machinery field, in particular to a kind of distributing valve, a kind of pumping system and a kind of engineering machinery.
Background technique
As shown in Figure 1, be the structural representation of a kind of distributing valve of the prior art, for example be applied in the conveying of carrying out slurry in the grouting pump.Above-mentioned distributing valve comprises discharging oil cylinder 000, valve body 100, material feeding mouth 200, charging oil cylinder 300 and discharge port 400.When hydraulic oil gets into left master cylinder rodless cavity, piston rod promotes left side concrete piston will carry the slurry discharge in the cylinder; Left side charging this moment valve plug has sealed the left side and has carried cylinder to lead to the passage of hopper under the effect of left side charging oil cylinder 310, and discharging valve plug in left side is opened the left side and carried cylinder to lead to the passage of discharge port 400 under the effect of left side discharging oil cylinder 010; Carry the slurry of discharging in the cylinder to be arranged to discharge port 400, discharge port 400 links to each other with conveyance conduit.Meanwhile; Hydraulic oil gets into right side master cylinder rod chamber and makes piston rod drive right side concrete piston-retraction and suck slurry; And right side discharging valve plug 021 has sealed the right side to carry cylinder to lead to the passage of discharge port under the effect of right side discharging oil cylinder 020, and right side charging valve plug 321 is under the effect of right side charging oil cylinder 320; Opened the right side and carried cylinder to lead to the passage of hopper, the slurry in the hopper is inhaled into the right cylinder of carrying.When above-mentioned motion was reached home, left side master cylinder rodless cavity hydraulic oil promoted pilot operated directional control valve, realized automatic reverse.So the right side carries the slurry in the cylinder to be arranged to discharge port 400, the left side is carried cylinder to suck the slurry in the hopper and is accomplished a work cycle.Yet, use above-mentioned four oil cylinders to control four valve plugs respectively, complex structure, take up room and cost higher.
Summary of the invention
Technical problem to be solved by this invention is, a kind of new distributing valve is provided, and it is little to take up room, simple in structure, and cost is lower.
In view of this; The invention provides a kind of distributing valve; Comprise driving mechanism, first valve body and second valve body and be separately positioned on said first valve body and said second valve body in first valve plug and second valve plug; Wherein, said first valve body is provided with first valve port and second valve port that is communicated with through valve pocket, and said second valve body is provided with the 3rd valve port and the 4th valve port that is communicated with through valve pocket; Said driving mechanism can drive said first valve plug and said second valve plug is synchronized with the movement: when said first valve plug sealed said first valve port, said the 3rd valve port was opened; When said second valve plug sealed said the 3rd valve port, said first valve port was opened.
Preferably; Said driving mechanism is the double piston-rod oil hydraulic cylinder; The two ends of the cylinder barrel of said double piston-rod oil hydraulic cylinder are connected to first valve body and second valve body respectively, and piston rod one end of said double piston-rod oil hydraulic cylinder is connected with said first valve plug after penetrating said first valve body, the other end is connected with said second valve plug after penetrating said second valve body.
Preferably, be installed with first flange and second flange respectively at the two ends of said cylinder barrel, an end of said cylinder barrel is connected to said first valve body through said first flange, and the other end of said cylinder barrel is connected to said second valve body through said second flange.
Preferably, said first flange is provided with first boss with the end that said first valve body is connected, and said second flange is provided with second boss with the end that said second valve body is connected; Said first valve body is provided with first mounting hole that matches with said first boss, and said second valve body is provided with second mounting hole that matches with said second boss; Said first boss stretches in said first mounting hole, and said second boss stretches in said second mounting hole.
Preferably, said second valve port and said the 4th valve port are incorporated into a passage through the breeches pipe.
The present invention also provides a kind of pumping system; Comprise and carry cylinder, supply pipe and discharge nozzle; Also comprise each described distributing valve in the technique scheme, wherein, said first valve port is connected to said discharge nozzle; Said the 3rd valve port is connected to said supply pipe, and said second valve port and said the 4th valve port all are connected to said conveying cylinder.
Preferably, comprise two said conveying cylinders and two said distributing valves, each said conveying cylinder is connected with the 4th valve port with second valve port of a said distributing valve.
Preferably, said second valve body is positioned at the top of said first valve body.
The present invention also provides a kind of pumping system; Comprise that two are carried cylinder, supply pipe and discharge nozzle, also comprise each described distributing valve in two technique scheme, wherein; Carrying cylinder to be respectively first for two carries cylinder and second to carry cylinder; Two said distributing valves are first distributing valve and second distributing valve, and said first valve port of two said distributing valves all is connected to said first and carries cylinder, and said the 3rd valve port of two said distributing valves all is connected to said second and carries cylinder; Second valve port and the 4th valve port of said first distributing valve all are connected to said supply pipe, and second valve port and the 4th valve port of said second distributing valve all are connected to said discharge nozzle.
Preferably, first valve port of two said distributing valves is incorporated into a passage through the breeches pipe; And/or the 3rd valve port of two said distributing valves is incorporated into a passage through the breeches pipe.
Preferably, first valve port of each said distributing valve and the 3rd valve port all are positioned on the same horizontal plane.
The present invention also provides a kind of engineering machinery, comprises each described concrete pumping system in the technique scheme, and described concrete pumping system obviously should have the beneficial effect that above-mentioned distributing valve has.
In sum, according to distributing valve of the present invention, adopt two valve plugs just can reach the purpose of suction and pumping; Simple in structure, distribute reliably, save cost and can save installing space; Adopt two valve plug actions of a driving mechanism synchronous drive; Simplified control system greatly, and alleviated the weight of complete machine, be convenient to install and transportation.In the pumping system of using above-mentioned distributing valve, can comprise two covers or the above distributing valve of two covers that link into an integrated entity, realize the uninterrupted pumping work that two or more carry cylinder.
Description of drawings
Fig. 1 shows the schematic representation of a kind of concrete valve of the prior art;
Fig. 2 is the schematic representation according to the distributing valve of the first embodiment of the present invention;
Fig. 3 is the schematic representation of double piston-rod oil hydraulic cylinder among Fig. 2;
Fig. 4 is the schematic representation according to the concrete pumping system of second embodiment of the invention;
Fig. 5 is the schematic representation when first distributing valve is in first kind of state among Fig. 4;
Schematic representation when Fig. 6 is second kind of state of first distributing valve among Fig. 4;
Fig. 7 is the schematic representation according to first kind of state of the pumping system of third embodiment of the invention;
Schematic representation when Fig. 8 is second kind of state of pumping system among Fig. 7.
Embodiment
Below in conjunction with description of drawings according to embodiment of the present invention.
A lot of details have been set forth in the following description so that make much of the present invention; But; The present invention can also adopt other to be different from other modes described here and implement, and therefore, protection scope of the present invention does not receive the restriction of following disclosed specific embodiment.
Fig. 2 is the schematic representation according to the distributing valve of the first embodiment of the present invention.
As shown in Figure 2; Distributing valve in the present embodiment; Comprise driving mechanism, first valve body 1 and second valve body 2 and be separately positioned on first valve body 1 and second valve body 2 in first valve plug 104 and second valve plug 204; Wherein, first valve body 1 is provided with first valve port 102 and second valve port, 103, the second valve bodies 2 that are communicated with through valve pocket and is provided with the 3rd valve port 202 and the 4th valve port 203 that is communicated with through valve pocket; Driving mechanism can drive first valve plug 104 and second valve plug 204 is synchronized with the movement: when first valve plug, 104 sealings, first valve port 102, the 3rd valve port 202 is opened; When second valve plug, 204 sealings the 3rd valve port 202, first valve port 102 is opened.
Adopt this distributing valve; Be alternately closed first valve port 102 and the 3rd valve port 202 through a driving mechanism; Realize between the 3rd valve port 202 and the 4th valve port 203, alternately being communicated with between first valve port 102 and second valve port 103, it is simple in structure, distributes reliable performance; Provide cost savings and can save installing space and alleviated the weight of complete machine, be convenient to install and transportation.
In a kind of specific embodiment; This driving mechanism is the double piston-rod oil hydraulic cylinder; The two ends of the cylinder barrel 5 of double piston-rod oil hydraulic cylinder are connected to first valve body 1 and second valve body 2 respectively, and piston rod one end of double piston-rod oil hydraulic cylinder is connected with first valve plug 104 after penetrating first valve body 1, the other end penetrates second valve body, 2 backs and is connected with second valve plug 204.
Certainly, this driving mechanism can also be motor driven gear or rack structure, perhaps linkage mechanism under the cam drive etc., and this driving mechanism can have a lot, promptly need not can realize through creative work according to enlightenment of the present invention again.
In this distributing valve; Oil hydraulic cylinder need drive valve plug and alternately seal first valve port 102 and the 3rd valve port 202; When concrete design; First valve port 102 and the 3rd valve port 202 are oppositely arranged, and the end face of first valve port 102 and the 3rd valve port 202 is arranged in parallel, to guarantee the sealability of two valve plugs and two valve ports.
Further, second valve port 103 and the 4th valve port 203 are incorporated into a passage through breeches pipe 61, have expanded the using scope of distributing valve, make distributing valve can satisfy single pass need of work, and are beneficial to runner optimization, reduce the circulating resistance of medium.
Fig. 3 is the schematic representation of double piston-rod oil hydraulic cylinder among Fig. 2.
Particularly; As shown in Figure 3; Double piston-rod oil hydraulic cylinder and two valve bodies 1 and 2 Placement can for; Be installed with first flange 41 and second flange 42 respectively at the two ends of cylinder barrel 5, an end of cylinder barrel 5 is connected to first valve body 1 through first flange 41, and the other end of cylinder barrel 5 is connected to second valve body 2 through second flange 42.
In a kind of specific embodiment, the end that first flange 41 is connected with first valve body 1 is provided with the end that first boss, 411, the second flanges 42 are connected with second valve body 2 and is provided with second boss 421; First valve body 1 is provided with first mounting hole that matches with first boss 411, and second valve body 2 is provided with second mounting hole that matches with second boss 421; First boss 411 stretches in first mounting hole, and second boss 421 stretches in second mounting hole.
Adopted technique scheme; Can reach the good sealing effect of flange and valve body joint; Avoided seepage effectively, and such structure higher pressure can be born, the operating mode in the jumbo can be satisfied through the medium of valve body; Have again; Distributing valve comprises that also two flanges can prevent to contact concrete piston rod gets into the double piston-rod oil hydraulic cylinder in the process of retreating cylinder barrel 5, with cylinder barrel 5 strong wearing and tearing takes place after just having avoided adhering on the double piston-rod hydraulic cylinder piston rod concrete, and then has avoided that good sealing is destroyed between piston rod and the cylinder barrel 5.
Wherein, Owing to two valve bodies are coupled together with the man type pipe fitting; So as preferred implementation, only the end at the double piston-rod oil hydraulic cylinder is fixedly connected with valve body through flange, but not two ends all are fixedly connected with valve body; Thereby can avoid oil cylinder or humanoid pipe fitting size slightly during deviation two valve bodies the constraint of crossing of oil cylinder is caused problems such as difficult installation; Only at one end be fixedly connected the requirement that can reduce, reduce manufacture cost, also be convenient to install the accuracy of manufacturing of man type pipe fitting and oil cylinder with valve body.
Fig. 4 is the schematic representation according to the concrete pumping system of second embodiment of the invention; Fig. 5 is the schematic representation when first distributing valve is in first kind of state among Fig. 4; Schematic representation when Fig. 6 is second kind of state of first distributing valve among Fig. 4.
On the basis of above-mentioned distributing valve; The present invention proposes a kind of pumping system of using above-mentioned distributing valve, this pumping system comprises carries cylinder 9, supply pipe 7 and discharge nozzle 8, also comprises in the technique scheme each distributing valve; Wherein, First valve port 102 is connected to discharge nozzle 8, the three valve ports 202 and is connected to supply pipe 7, the second valve ports 103 and the 4th valve port 203 and all is connected to and carries cylinder 9.
As shown in Figure 4, in concrete application process, in order to realize the uninterrupted pumping effect to material, above-mentioned pumping system can comprise that two are carried cylinder 9 and two distributing valves, and each carries cylinder 9 to be connected with the 4th valve port 203 with second valve port 103 of a distributing valve respectively.
Adopt in the pumping system of two distributing valves, in order to improve the holistic resistant behavior of distributing mechanism, two independent moulding of distributing valve, and between is fixed through connected element.
As preferred embodiment, in distributing valve, the top that second valve body 2 is positioned at first valve body 1 is set; Be the top charging of pumping system from distributing valve; And from the below discharging of distributing valve, like this, in suction and stock process; Can also play auxiliary effect by the gravity of material, so that improve suction and stock performance.
In the present embodiment; Second valve port 103 is incorporated into a passage with the 4th valve port 203 through breeches pipe 61 and links to each other with carrying cylinder, has expanded the using scope of distributing valve, makes distributing valve can satisfy single pass need of work; And be beneficial to runner optimization, reduce the circulating resistance of medium.
In addition, by visible among the figure, breeches pipe 61 top is shorter than the bottom, is because top is used for charging, and short the setting in the time of can avoiding carrying the cylinder pump material the top of too much material obstruction optimized the pumping process, improved pumping efficiency.
Above-mentioned pumping system down, alternately seals first valve port 102 and the 3rd valve port 202 through the double piston-rod oil hydraulic cylinder in working order, realizes carrying the switching of cylinder under suction and stock state, thereby realizes the uninterrupted pumping of material.
Particularly, two distributing valves are that first distributing valve 301 and 302, two conveyings of second distributing valve cylinder 9 are that the first conveying cylinder 901 and second is carried cylinder 902.
In first distributing valve 301:
As shown in Figure 5, under first kind of state, first valve plug, 104 sealings, first valve port 102; The 3rd valve port 202 is opened; The 3rd valve port 202 is communicated with the 4th valve port 203, and material gets into through valve pocket and through the 4th valve port 203 from the 3rd valve port 202 and carries cylinder 901, carries cylinder 901 to carry out the suction action;
As shown in Figure 6; Under second kind of state; Second valve plug, 204 sealings the 3rd valve port, 202, the first valve ports 102 are opened, and first valve port 102 is communicated with second valve port 102; Carry the material in the cylinder 901 to pump through valve pocket and through first valve port 102, carry cylinder 901 to carry out the stock action from second valve port 103.
In second distributing valve 302 then with the opposite states of first distributing valve 301, when promptly first distributing valve 301 was in first kind of state, second distributing valve 302 was in second kind of state, on the contrary in like manner.Another carries the cylinder pump material simultaneously so just can to carry the cylinder suction at one, carries cylinder to pass through alternately suction and stock, has realized material uninterrupted pumping effect for two.
Fig. 7 is the schematic representation according to first kind of state of the pumping system of third embodiment of the invention; Schematic representation when Fig. 8 is second kind of state of pumping system among Fig. 7.
Like Fig. 7 and shown in Figure 8, the pumping system in the present embodiment comprises that two are carried cylinder 9, supply pipe 7 and discharge nozzle 8; The distributing valve that also comprises in two technique scheme each; Wherein, two carry cylinder 9 to be respectively first to carry 902, two distributing valves of the cylinder 901 and the second conveying cylinder be first distributing valve 301 and second distributing valve 302; First valve port 102 of two distributing valves all is connected to first and carries cylinder 901; The 3rd valve port 202 of two distributing valves all is connected to second and carries second valve port 103 of cylinder 902, the first distributing valves and second valve port 103 and the 4th valve port 203 that the 4th valve port 203 all is connected to supply pipe 7, the second distributing valves all to be connected to discharge nozzle 8.
When concrete design, first valve port 102 of two distributing valves is incorporated into a passage through breeches pipe 62; And/or the 3rd valve port 202 of two distributing valves is incorporated into a passage through breeches pipe 62.In this technological scheme, expanded the using scope of distributing valve, make distributing valve can satisfy single pass need of work, and be beneficial to runner optimization, reduce the circulating resistance of medium.
In this embodiment, two are carried cylinders 9 is horizontal arrangement, so that first valve port 102 of each distributing valve and the 3rd valve port 202 all are positioned on the same horizontal plane is more reasonable, accordingly, the oil hydraulic cylinder of two distributing valves is horizontally disposed with, like Fig. 7 and shown in Figure 8.
Distributing valve can be made of one moulding in the present embodiment, and also moulding and fix through modes such as bolts is respectively repeated no more at this.
Based on technique scheme, the working method of the pumping system in the present embodiment is following:
When pumping system is in first kind of state shown in Figure 7; In first distributing valve 301; First valve plug 104 is sealed first valve port 103; The 3rd valve port 202 is communicated with the 4th valve port 203, and material is got in the second conveying cylinder 902 through valve pocket and through the 3rd valve port 202 by the 4th valve port 203, and second carries cylinder 902 to carry out the suction action through first distributing valve 301; And this moment second distributing valve 302 in; First valve port 102 is opened; Second valve plug 204 is sealed the 3rd valve port 202; First valve port 102 is communicated with second valve port 103, and first carries the material in the cylinder 901 outwards to be pumped through valve pocket and through second valve port 103 by first valve port 102, and first carries cylinder 901 to carry out the stock action through second distributing valve 302.
When accomplishing this pumping stroke, get into next pumping stroke; At this moment, the switching-over of pumping main system carries cylinder to switch the pumping state thereby control two; First carries cylinder 901 to switch to the suction action by the stock action, and second carries cylinder 902 to switch to the stock action by the suction action.
Under second kind of state; As shown in Figure 8, in first distributing valve 301, first valve port 102 is opened; Second valve plug 204 is sealed the 3rd valve port 202; First valve port 102 is communicated with second valve port 103, and material is got in the first conveying cylinder 901 through valve pocket and through first valve port 102 by the secondth valve port 103, and first carries cylinder 901 to carry out the suction action through first distributing valve 301; And this moment second distributing valve 302 in; First valve plug 104 is sealed first valve port 103; Second valve port 202 is communicated with the 4th valve port 203; Second carries the material in the cylinder 902 outwards to be pumped through valve pocket and through the 4th valve port 203 by the 3rd valve port 202, and second carries cylinder 902 to carry out the stock action through second distributing valve 302.
Pumping system is compared among pumping system in the present embodiment and second embodiment; Among second embodiment; The state that this distributing valve of valve plug may command in distributing valve carries out suction and stock switches; And in the present embodiment, the valve plug in distributing valve can be controlled this distributing valve to different conveying cylinder suctions, and the valve plug in another distributing valve can be controlled this distributing valve to different conveying cylinder pump material.
Pumping system provided by the invention is applied in the engineering machinery, can obtains the embodiment of engineering machinery provided by the present invention, described engineering machinery obviously should have the beneficial effect that above-mentioned pumping system has.
In sum, according to distributing valve of the present invention, adopt two valve plugs just can reach the purpose of suction and pumping; Simple in structure, distribute reliably, save cost and can save installing space; Adopt two valve plug actions of a driving mechanism synchronous drive; Simplified control system greatly, and alleviated the weight of complete machine, be convenient to install and transportation.And, in using the pumping system of above-mentioned distributing valve, can comprise that two covers that link into an integrated entity or two covers with the distributing valve of upper valve body and valve plug, realize the uninterrupted pumping work of two or more conveying cylinders.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. a distributing valve is characterized in that, comprise driving mechanism, first valve body (1) and second valve body (2) and be separately positioned on said first valve body (1) and said second valve body (2) in first valve plug (104) and second valve plug (204), wherein,
Said first valve body (1) is provided with first valve port (102) and second valve port (103) that is communicated with through valve pocket; Said second valve body (2) is provided with the 3rd valve port (202) and the 4th valve port (203) that is communicated with through valve pocket, and said driving mechanism can drive said first valve plug (104) and said second valve plug (204) is synchronized with the movement:
When said first valve plug (104) said first valve port of sealing (102), said the 3rd valve port (202) is opened;
When said second valve plug (204) said the 3rd valve port of sealing (202), said first valve port (102) is opened.
2. distributing valve according to claim 1; It is characterized in that; Said driving mechanism is the double piston-rod oil hydraulic cylinder; The two ends of the cylinder barrel of said double piston-rod oil hydraulic cylinder (5) are connected to first valve body (1) and second valve body (2) respectively, and piston rod one end of said double piston-rod oil hydraulic cylinder is connected with said first valve plug (104) after penetrating said first valve body (1), the other end penetrates said second valve body (2) back and is connected with said second valve plug (204).
3. distributing valve according to claim 2 is characterized in that,
Be installed with first flange (41) and second flange (42) respectively at the two ends of said cylinder barrel (5); One end of said cylinder barrel (5) is connected to said first valve body (1) through said first flange (41), and the other end is connected to said second valve body (2) through said second flange (42).
4. distributing valve according to claim 3 is characterized in that,
The end that said first flange (41) is connected with said first valve body (1) is provided with first boss (411), and the end that said second flange (42) is connected with said second valve body (2) is provided with second boss (421);
Said first valve body (1) is provided with first mounting hole that matches with said first boss (411), and said second valve body (2) is provided with second mounting hole that matches with said second boss (421);
Said first boss (411) stretches in said first mounting hole, and said second boss (421) stretches in said second mounting hole.
5. according to each described distributing valve in the claim 1 to 4, it is characterized in that said second valve port (103) is incorporated into a passage with said the 4th valve port (203) through the breeches pipe.
6. a pumping system is characterized in that, comprises carrying cylinder (9), supply pipe (7) and discharge nozzle (8), it is characterized in that, also comprise like each described distributing valve in the claim 1 to 5, wherein,
Said first valve port (102) is connected to said discharge nozzle (8), and said the 3rd valve port (202) is connected to said supply pipe (7), and said second valve port (103) and said the 4th valve port (203) all are connected to said conveying cylinder (9).
7. pumping system according to claim 6 is characterized in that, comprises two said conveying cylinders (9) and two said distributing valves, and each said conveying cylinder (9) is connected with the 4th valve port (203) with second valve port (103) of a said distributing valve.
8. pumping system according to claim 7 is characterized in that, said second valve body (2) is positioned at the top of said first valve body (1).
9. a pumping system is characterized in that, comprises that two are carried cylinder (9), supply pipe (7) and discharge nozzle (8), it is characterized in that, also comprises two like each described distributing valve in the claim 1 to 5, wherein,
Carry cylinder (9) to be respectively first for two and carry cylinder (901) and second to carry cylinder (902), two said distributing valves are first distributing valve (301) and second distributing valve (302),
Said first valve port (102) of two said distributing valves all is connected to said first and carries cylinder (901); Said the 3rd valve port (202) of two said distributing valves all is connected to said second and carries cylinder (902); Second valve port (103) and the 4th valve port (203) of said first distributing valve all are connected to said supply pipe (7), and second valve port (103) and the 4th valve port (203) of said second distributing valve all are connected to said discharge nozzle (8).
10. pumping system according to claim 9 is characterized in that, first valve port (102) of two said distributing valves is incorporated into a passage through the breeches pipe; And/or the 3rd valve port (202) of two said distributing valves is incorporated into a passage through the breeches pipe.
11., it is characterized in that first valve port (102) of each said distributing valve all is positioned on the same horizontal plane with the 3rd valve port (202) according to claim 9 or 10 described pumping systems.
12. an engineering machinery is characterized in that, comprises like each described pumping system in the claim 6 to 11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210112694.9A CN102619743B (en) | 2012-04-17 | 2012-04-17 | Distributing valve, pumping system and engineering machinery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210112694.9A CN102619743B (en) | 2012-04-17 | 2012-04-17 | Distributing valve, pumping system and engineering machinery |
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| CN102619743A true CN102619743A (en) | 2012-08-01 |
| CN102619743B CN102619743B (en) | 2014-12-10 |
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| CN104358684A (en) * | 2014-10-30 | 2015-02-18 | 合肥工业大学 | Flow balancing device for piston pump |
| CN107956666A (en) * | 2018-01-09 | 2018-04-24 | 长沙紫宸科技开发有限公司 | A kind of two-cylinder type sludge pump with discharging sealing switching device |
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| CN104358684B (en) * | 2014-10-30 | 2016-08-24 | 合肥工业大学 | A kind of flow equilibrium device for piston pump |
| CN107956666A (en) * | 2018-01-09 | 2018-04-24 | 长沙紫宸科技开发有限公司 | A kind of two-cylinder type sludge pump with discharging sealing switching device |
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| Publication number | Publication date |
|---|---|
| CN102619743B (en) | 2014-12-10 |
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