CN103727102B - A kind of constant pressure hydraulic station - Google Patents
A kind of constant pressure hydraulic station Download PDFInfo
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- CN103727102B CN103727102B CN201410040945.6A CN201410040945A CN103727102B CN 103727102 B CN103727102 B CN 103727102B CN 201410040945 A CN201410040945 A CN 201410040945A CN 103727102 B CN103727102 B CN 103727102B
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Abstract
The present invention relates to offshore rig field, be specifically related to a kind of constant pressure hydraulic station, comprise fuel tank (22), relief valve (24) and at least a set of pump group, often overlap described pump group and comprise solenoid valve (13), motor (15) and constant pressure pump (16), described motor (15) connects constant pressure pump (16), and the inlet port S of constant pressure pump (16) is connected with fuel tank (22); The drain tap T of constant pressure pump (16) is connected with fuel tank (22); When comprising two covers or two the above pump groups of cover, the outlet B parallel connection of often overlapping the constant pressure pump (16) of pump group forms the pressure port (28) of hydraulic station; Described constant pressure pump (16) also comprises the first control mouth (X) and second and controls mouth (Mst).When hydraulic station of the present invention starts, motor and constant pressure pump are equivalent to No Load Start, i.e. low voltage starting, and power is very little, starting without impacting, effectively can improve reliability and the life-span of motor and constant pressure pump.
Description
Technical field
The present invention relates to offshore rig field, be specifically related to a kind of constant pressure hydraulic station.
Background technique
Along with the development of marine drilling technology, drill rod processing device, marine riser treatment device, moon pool dolly etc. are becoming indispensable industrial standard in deepwater drilling Platform Designing.Hydraulic station, as the power source of the various hydraulic equipments such as drill rod processing device, marine riser treatment device, moon pool dolly, bucking-out system, is widely used in marine drilling platform or drill ship.In deepwater drilling work, hydraulic station is in continual operation in 24 hours substantially, once hydraulic station goes wrong, can cause the stopping of drillng operation, bring about great losses, and the hydraulic station therefore in deepwater drilling work has a very important role.
At present, on deepwater drilling platform, the equipment be connected with hydraulic station is many and distribution distance is far away, the pressure port of equipment is connected with the pressure port P of hydraulic station, return opening is connected with the return opening R of hydraulic station, this type of hydraulic station is all larger, be made up of multiple constant pressure pump, and is all constant pressure hydraulic station, and rated pressure is generally 210bar.
As shown in Figure 1, be a kind of the most frequently used constant pressure hydraulic station in prior art, hydraulic station has a set of pump group at least, is preferably three covers and above pump group, and each cover pump group is arranged side by side, wherein any a set of for subsequent use.Motor one 3(represents with 3c with 3a, 3b respectively) be connected constant pressure pump one 4(and represent with 4a, 4b and 4c respectively), the inlet port S of constant pressure pump 1 is represented with 1c with 1a, 1b respectively by oil absorption filter one 1() be connected with fuel tank 1.The outlet B of constant pressure pump 1 is connected with safety valve 1 entrance (representing with 5c with 5a, 5b respectively), high pressure filter 1 entrance (representing with 6c with 6a, 6b respectively) respectively, safety valve 1 outlet is connected with one-way valve 4 11, return filter 10 entrance respectively, high pressure filter 1 outlet is connected with one-way valve 37 entrance (representing with 7c with 7a, 7b respectively), and one-way valve 37 exports and is unified into pressure port P.The drain tap T of constant pressure pump 1 represents with 2c with 2a, 2b respectively through ball valve four 2() be connected with draining filter 1 entrance, draining filter 1 outlet is connected with fuel tank 1.Return opening R is connected with one-way valve 4 11 entrance, and one-way valve 4 11 outlet is connected with fuel tank 1 through return filter 1.
Described constant pressure pump 1 comprises variable displacement pump one 401(and represents with 401a, 401b and 401c respectively), variable piston oil-cylinder one 402(represents with 402a, 402b and 402c respectively), pressure controlled valve one 403(represents with 403a, 403b and 403c respectively), variable displacement pump 1 is connected with variable piston oil-cylinder 1, and variable piston oil-cylinder 1 is connected with pressure controlled valve 1.
The pressure of the pressure port P of hydraulic station is equal with the pressure of the outlet B of variable displacement pump 1, is the system pressure of hydraulic station.Pressure controlled valve 1 is set as 210bar, be rated pressure, variable displacement pump only provides the flow needed for load, even if when changes in flow rate, also can keeping system pressure almost constant, pressure during minimum injection rate is about than pressure height about 3bar during maximum pump discharge, and namely the difference of system pressure and rated pressure can not more than 3bar.If the pressure that variable displacement pump 1 exports B exceedes rated pressure, pressure controlled valve 1 is just operated in left position, variable piston oil-cylinder 1 rodless cavity enters pressure oil, variable piston oil-cylinder 1 stretches out thus promotes the swash plate pivot angle of variable displacement pump 1, pump delivery is reduced, until pressure divergence is repaired.If variable displacement pump 1 exports the pressure of B lower than rated pressure, pressure controlled valve 1 is just operated in right position, the rodless cavity off-load of variable piston oil-cylinder 1, variable piston oil-cylinder 1 is retracted thus is pulled the swash plate pivot angle of variable displacement pump 1, pump delivery is increased, until pressure divergence is repaired.
Prior art Problems existing has: first, hydraulic station of the prior art responds soon and is not subject to load effect, but the rated pressure of each pump is set by respective pressure controlled valve respectively, under same system pressure, the setting value of pressure controlled valve 1 has a deviation a little, and the system pressure of each pump is just different from rated pressure difference, and each pump delivery will be caused different, total output flow of system does not reach rated flow, and it is different that Long-Time Service also can cause each pump to wear and tear;
Second, variable displacement pump 1 startup is in maximum pump discharge and rated pressure instantaneously, after outlet pressure is greater than rated pressure, then the discharge capacity of variable displacement pump 1 just reduces, namely band carries and starts, the load of moment can be caused to exceed load rating, directly cause reliability decrease and the lost of life of pump and its motor;
3rd, under hydraulic station standby operating conditions, pump no-output flow, the pressure ratio rated pressure also high 3bar of hydraulic station, now pump delivery is reduced to minimum, only meets internal leakage, but because its pressure is high so power loss is still relatively large, and be in the reliability of high pressure meeting influential system always;
4th, device height difference on drill platform reaches tens meters, and existing hydraulic station sets return oil pressure by one-way valve 4 11, it is unadjustable, equipment return oil pressure for lower is excessive, and may be too low and cause pipeline evacuation for the equipment return oil pressure of eminence, direct usability, response performance and the reliability affecting equipment.
Summary of the invention
For prior art Problems existing, when providing a kind of low voltage starting to impact little, high-pressure work, each constant pressure pump discharge capacity is consistent and return line can be avoided to occur emptying constant pressure hydraulic station.
The technical solution used in the present invention is:
A kind of constant pressure hydraulic station, comprises fuel tank, relief valve and at least a set of pump group, often overlaps described pump group and comprise solenoid valve, motor and constant pressure pump, and described motor connects constant pressure pump, and the inlet port S of constant pressure pump is connected with fuel tank; The drain tap T of constant pressure pump is connected with fuel tank; When comprising two covers or two the above pump groups of cover, the constant voltage delivery side of pump B parallel connection of often overlapping pump group forms the pressure port of hydraulic station;
Described constant pressure pump also comprises the first control mouth and second and controls mouth, and the first control mouth often overlapping the constant pressure pump of pump group is connected with the entrance of relief valve, and the outlet of relief valve is connected with fuel tank; Second of constant pressure pump controls mouth and is connected with the pressure port P of solenoid valve, and the oil return inlet T of solenoid valve is connected with fuel tank;
Described constant pressure pump comprises variable displacement pump, selector valve, throttle orifice one, one-way valve one, throttle orifice two, pressure controlled valve, variable piston oil-cylinder, throttle orifice three; The swash plate of described variable displacement pump is connected with variable piston oil-cylinder, and the variable displacement pump outlet respectively B mouth of control mouth and P mouth, the variable piston oil-cylinder of position left with pressure controlled valve, throttle orifice two is connected; The A mouth of pressure controlled valve is connected with the drain tap T of constant pressure pump, throttle orifice three respectively; The A mouth of variable piston oil-cylinder is connected with the B mouth of pressure controlled valve, throttle orifice three respectively; The control mouth of the right position of pressure controlled valve respectively with one-way valve one entrance, throttle orifice two, second the controlling mouth and be connected of constant pressure pump; The P mouth of selector valve is connected with the outlet of throttle orifice one, one-way valve one respectively, the A mouth of selector valve respectively with throttle orifice one, first the controlling mouth and be connected of constant pressure pump.
As the preferred embodiment of the present invention, also comprise cracking pressure can the first socket pressure valve of electrodeless adjustment, cracking pressure can the second socket pressure valve of electrodeless adjustment, hydraulic station first return opening be connected with the oil return of lower equipment and hydraulic station second return opening be connected with the oil return of eminence equipment; Described hydraulic station first return opening is connected with the first socket pressure valve entrance, and hydraulic station second return opening is connected with the second socket pressure valve entrance, after the first socket pressure valve outlet is in parallel with the outlet of the second socket pressure valve, is connected with fuel tank through return filter.
As the preferred embodiment of the present invention, described pump group of often overlapping also comprises safety valve, high pressure filter and one-way valve two; Described constant voltage delivery side of pump B is connected with safety valve entrance, high pressure filter entrance respectively, safety valve outlet exports with return filter entrance, the first socket pressure valve respectively, the second socket pressure valve exports and is connected, high pressure filter outlet is connected with one-way valve two entrance, when comprising at least two described pump groups of cover, the outlet parallel connection of often overlapping the one-way valve two of pump group forms the pressure port of hydraulic station.
As the preferred embodiment of the present invention, also comprise draining filter, and often cover pump group also comprises oil absorption filter, ball valve one, ball valve two and ball valve three; The inlet port S of described constant pressure pump is connected with fuel tank by oil absorption filter; The drain tap T often overlapping the constant pressure pump of pump group is connected with draining filter inlet through ball valve one, and draining filter outlet is connected with fuel tank; The the first control mouth often overlapping the constant pressure pump of pump group is connected with the entrance of relief valve through ball valve two; Second of constant pressure pump controls mouth and is connected with the pressure port P of solenoid valve through ball valve three.
As the preferred embodiment of the present invention, comprise three covers or three the above pump group of cover, wherein a set of as stand by pump group arbitrarily.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows:
1, when hydraulic station starts, motor and constant pressure pump are equivalent to No Load Start, i.e. low voltage starting, and power is very little, starting without impacting, effectively can improve reliability and the life-span of motor and constant pressure pump.
2, during hydraulic station work, the pilot pressure of all pumps is all determined by relief valve, and identical pilot pressure makes each constant voltage pump delivery all be consistent, thus can export maximum flow system flow simultaneously.There will not be and cause pump displacement different because pilot pressure is different, and make the flow of output different, thus maximum flow system flow can not be reached.After Long-Time Service, the wearing and tearing of each constant pressure pump inside also can not be caused different.
3, when hydraulic station is standby, identical with the operating mode of low voltage starting, standby power is little, and system is in low-pressure state, effectively can improve the reliability of system, and as being switched to high pressure conditions, only need corresponding solenoid valve to obtain electric, response quickly.And the constant pressure hydraulic station of routine, under standby operating conditions, the pressure ratio rated pressure also high 3bar of hydraulic station, though the output flow of pump is let out without unnecessary output in only meeting, but power loss is still relatively large, hydraulic system is in high pressure conditions, also can the reliability of influential system.
4, in the equipment be connected with hydraulic station, the equipment oil return being in lower is connected to hydraulic station first return opening, the equipment oil return being in eminence is connected to hydraulic station second return opening, the cracking pressure of step-less adjustment first socket pressure valve and the second socket pressure valve is carried out according to the height of equipment, thus avoid return line to occur emptying phenomenon, the equipment back pressure of lower can be reduced simultaneously, reduce power loss, and the usability of hydraulic equipment, response performance and reliability can be increased substantially.
Accompanying drawing explanation
Fig. 1 is prior art hydraulic connecting schematic diagram
Fig. 2 hydraulic connecting schematic diagram of the present invention
Fig. 3 is the inner annexation enlarged view of constant pressure pump in the present invention
Mark in figure: 1-oil absorption filter one, 2-ball valve four, 3-motor one, 4-constant pressure pump one, 401-variable displacement pump one, 402-variable piston oil-cylinder one, 403-pressure controlled valve one, 5-safety valve one, 6-high pressure filter one, 7-one-way valve three, 8-draining filter one, 9-fuel tank one, 10-return filter one, 11-one-way valve four, 12-oil absorption filter, 13-solenoid valve, 14-ball valve one, 15-motor, 16-constant pressure pump, 161-variable displacement pump, 162-selector valve, 163-throttle orifice one, 164-one-way valve one, 165-throttle orifice two, 166-pressure controlled valve, 167-variable piston oil-cylinder, 168-throttle orifice, 17-ball valve two, 18-safety valve, 19-high pressure filter, 20-one-way valve two, 21-draining filter, 22-fuel tank, 23-ball valve three, 24-relief valve, 25-return filter, 26-first socket pressure valve, 27-second plug-in mounting pressure valve, 28-hydraulic station pressure port, X-first controls mouth, Mst-second controls mouth, R1-first return opening, R2-second return opening.
Embodiment
In order to make object of the present invention, technological scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention will be further described.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
embodiment 1
As shown in Figure 2, constant pressure hydraulic station of the present invention comprises at least a set of pump group, is preferably three covers and above pump group, and each cover pump group is arranged side by side, wherein any a set of for subsequent use, adopts three cover pump groups in the present embodiment.Constant pressure hydraulic station of the present invention also comprises draining filter 21, fuel tank 22, relief valve 24, return filter 25, first socket pressure valve 26, second socket pressure valve 27.
Often overlap pump group to comprise in oil absorption filter 12(figure and use 12a respectively, 12b and 12c represents), solenoid valve 13(uses 13a respectively, 13b and 13c represents), ball valve one 14(uses 14a respectively, 14b and 14c represents), motor 15(uses 15a respectively, 15b and 15c represents), constant pressure pump 16(uses 16a respectively, 16b and 16c represents), ball valve two 17(uses 17a respectively, 17b and 17c represents), safety valve 18(uses 18a respectively, 18b and 18c represents), high pressure filter 19(uses 19a respectively, 19b and 19c represents), one-way valve two 20(uses 20a respectively, 20b and 20c represents), ball valve three 23(uses 23a respectively, 23b and 23c represents).
Motor 15 connects constant pressure pump 16, and the inlet port S of constant pressure pump 16 is connected with fuel tank 22 by oil absorption filter 12.The outlet B of constant pressure pump 16 is connected with safety valve 18 entrance, high pressure filter 19 entrance respectively, safety valve 18 export export with return filter 25 entrance, the first socket pressure valve 26 respectively, the second socket pressure valve 27 exports and is connected, high pressure filter 19 exports and is connected with one-way valve 2 20 entrance, and one-way valve 2 20 exports and is unified into pressure port P.The drain tap T of constant pressure pump 16 is connected with draining filter 21 entrance through ball valve 1, and draining filter 21 exports and is connected with fuel tank.First of constant pressure pump 16 controls mouth X and is connected through the entrance of ball valve 2 17 with relief valve 24, and the outlet of relief valve 24 is connected with fuel tank 22.Second of constant pressure pump controls mouth Mst and is connected through the pressure port P of ball valve 3 23 with solenoid valve 13, and the oil return inlet T of solenoid valve 13 is connected with fuel tank 22.First return opening R1 is connected with the first socket pressure valve 26 entrance, and the second return opening R2 is connected with the second socket pressure valve 27 entrance, after the first socket pressure valve 26 outlet is in parallel with the outlet of the second socket pressure valve 27, is connected with fuel tank 22 through return filter 25.
As shown in Figure 3, constant pressure pump 16 comprises variable displacement pump 161, selector valve 162, throttle orifice 1, one-way valve 1, throttle orifice 2 165, pressure controlled valve 166, variable piston oil-cylinder 167, throttle orifice 3 168.
The swash plate of variable displacement pump 161 is connected with variable piston oil-cylinder 167, variable displacement pump 161 export B respectively with control mouth and the P mouth of the left position of pressure controlled valve 166, the B mouth of variable piston oil-cylinder 167, throttle orifice 2 165 is connected, the A mouth of pressure controlled valve 166 is respectively at drain tap T, throttle orifice 3 168 is connected, the A mouth of variable piston oil-cylinder 167 is respectively at the B mouth of pressure controlled valve 166, throttle orifice 3 168 is connected, the control mouth of the right position of pressure controlled valve 166 respectively with one-way valve 1 entrance, throttle orifice 2 165, second controls mouth Mst is connected, the P mouth of selector valve 162 respectively with throttle orifice 1, one-way valve 1 exports and is connected, the A mouth of selector valve 162 respectively with throttle orifice 1, first controls mouth X is connected.
Working principle of the present invention is as follows:
The pressure of the pressure port P of hydraulic station is equal with the pressure of the outlet B of constant pressure pump 16, be the system pressure of hydraulic station, system pressure is the setting pressure that the control mouth pressure of the right position of pressure controlled valve 166 adds pressure controlled valve 166, pressure controlled valve 166 has same minimum setting pressure 33bar, and the setting pressure of relief valve 24 is 177bar.During work, the control mouth pressure of the right position of pressure controlled valve 166 is the setting pressure of relief valve 24, and now system pressure is 210bar, is rated pressure; During Low-pressure load discharge, the control mouth pressure of the right position of pressure controlled valve 166 is zero, and now system pressure is 33bar.Variable displacement pump only provides the flow needed for load, even if when changes in flow rate, also can keeping system pressure almost constant, pressure during minimum injection rate is about than pressure height about 3bar during maximum pump discharge, and namely the difference of system pressure and rated pressure can not more than 3bar.The rated pressure of the pressure ratio constant pressure pump 16 of safety valve 18 is high by about 10%.
Low voltage starting operating mode.Solenoid valve 13 dead electricity, solenoid valve 13 is operated in right position, second of constant pressure pump 16 controls mouth Mst and gets back to fuel tank 22 through ball valve 3 23, solenoid valve 13, second control mouth Mst pressure is zero, because relief valve 24 setting pressure is very high, the control mouth of the right position of pressure controlled valve 166 controls mouth Mst pressure release through second, now the outlet B of variable displacement pump 161 is 33bar, be in Low-pressure load discharge state, load does not have action not need output flow, the discharge capacity of constant pressure pump 16 changes to minimum, and flow only meets in pump self to be let out, and does not externally export any flow.Motor 2 15 and constant pressure pump 16 are equivalent to No Load Start, i.e. low voltage starting, and power is very little, starting without impacting, effectively can improve motor two, the reliability of pump and life-span.
High-pressure work operating mode.When after low voltage starting at least 15s, solenoid valve 13 obtains electric, solenoid valve 13 is operated in left position, second loop controlling mouth Mst and fuel tank 22 of constant pressure pump 16 disconnects, the control mouth of its right position of pressure controlled valve 166 can only link fuel tank 22 from through one-way valve 1, selector valve 162, ball valve 2 17, relief valve 24, now the control mouth pressure of the right position of pressure controlled valve 166 reaches 177bar, constant pressure pump 16 is in rated pressure state, and high pressure oil is parallel to pressure port P externally supplies through high pressure filter 19, one-way valve 2 20.The pilot pressure of all pumps is all determined by relief valve 24, and identical pilot pressure makes the discharge capacity of each constant pressure pump 16 all be consistent, thus can export maximum flow system flow simultaneously.There will not be and cause pump displacement different because pilot pressure is different, and make the flow of output different, thus maximum flow system flow can not be reached.After Long-Time Service, the wearing and tearing of each constant pressure pump 16 inside also can not be caused different.
Standby operating conditions.Make solenoid valve 13 dead electricity, now identical with the operating mode of low voltage starting, standby power is little, and system is in low-pressure state, the reliability of effective raising system, and as being switched to high pressure conditions, only need corresponding solenoid valve 13 to obtain electric, response quickly.And the constant pressure hydraulic station of routine, under standby operating conditions, the pressure ratio rated pressure also high 3bar of hydraulic station, though the output flow of pump is let out without unnecessary output in only meeting, but power loss is still relatively large, hydraulic system is in high pressure conditions, also can the reliability of influential system.
Return oil pressure adjusts.First socket pressure valve 26 is identical with one-way valve three with the effect of the second socket pressure valve 27, but its cracking pressure (i.e. back pressure) can stepless changing.Device height difference on drill platform reaches tens meters, and the height difference of fluid can produce different pressure, and high lower pipeline pressure reduction even can reach about 7bar.Being in the equipment return oil pressures such as the marine riser treatment device of lower, moon pool dolly can set less; And equipment is driven etc. for the drill rod processing device of eminence, top, mounting point is very high, needs to tune up return oil pressure, if the return oil pressure of setting is less than pipeline pressure reduction, the oil return that there will be equipment is directly flowed back to fuel tank and formed emptying phenomenon.Therefore the equipment oil return of lower is connected to the first return opening R1, the equipment oil return of eminence is connected to the second return opening R2, and the cracking pressure of step-less adjustment first socket pressure valve 26 and the second socket pressure valve 19 is carried out according to the height of equipment, thus avoid return line to occur emptying phenomenon, the equipment back pressure of lower can be reduced again, reduce power loss, and the usability of hydraulic equipment, response performance and reliability can be increased substantially.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. a constant pressure hydraulic station, comprise fuel tank (22), relief valve (24) and at least a set of pump group, often overlap described pump group and comprise solenoid valve (13), motor (15) and constant pressure pump (16), described motor (15) connects constant pressure pump (16), and the inlet port S of constant pressure pump (16) is connected with fuel tank (22); The drain tap T of constant pressure pump (16) is connected with fuel tank (22); When comprising two covers or two the above pump groups of cover, the outlet B parallel connection of often overlapping the constant pressure pump (16) of pump group forms the pressure port (28) of hydraulic station;
It is characterized in that, described constant pressure pump (16) also comprises the first control mouth (X) and second and controls mouth (Mst), first control mouth (X) of often overlapping the constant pressure pump (16) of pump group is connected with the entrance of relief valve (24), and the outlet of relief valve (24) is connected with fuel tank (22); Second of constant pressure pump (16) controls mouth (Mst) and is connected with the pressure port P of solenoid valve (13), and the oil return inlet T of solenoid valve (13) is connected with fuel tank (22);
Described constant pressure pump (16) comprises variable displacement pump (161), selector valve (162), throttle orifice one (163), one-way valve one (164), throttle orifice two (165), pressure controlled valve (166), variable piston oil-cylinder (167), throttle orifice three (168); The swash plate of described variable displacement pump (161) is connected with variable piston oil-cylinder (167), and variable displacement pump (161) outlet is connected with the B mouth of the control mouth of pressure controlled valve (166) left position and P mouth, variable piston oil-cylinder (167), throttle orifice two (165) respectively; The A mouth of pressure controlled valve (166) is connected with the drain tap T of constant pressure pump (16), throttle orifice three (168) respectively; The A mouth of variable piston oil-cylinder (167) is connected with the B mouth of pressure controlled valve (166), throttle orifice three (168) respectively; The control mouth of pressure controlled valve (166) right position respectively with one-way valve one (164) entrance, throttle orifice two (165), second the controlling mouth (Mst) and be connected of constant pressure pump (16); The P mouth of selector valve (162) is connected with the outlet of throttle orifice one (163), one-way valve one (164) respectively, the A mouth of selector valve (162) respectively with throttle orifice one (163), first the controlling mouth (X) and be connected of constant pressure pump (16).
2. constant pressure hydraulic station according to claim 1, it is characterized in that, also comprise cracking pressure can the first socket pressure valve (26) of electrodeless adjustment, cracking pressure can the second socket pressure valve (27) of electrodeless adjustment, hydraulic station first return opening (R1) be connected with the oil return of lower equipment and hydraulic station second return opening (R2) be connected with the oil return of eminence equipment; Described hydraulic station first return opening (R1) is connected with the first socket pressure valve (26) entrance, hydraulic station second return opening (R2) is connected with the second socket pressure valve (27) entrance, after first socket pressure valve (26) outlet is in parallel with the outlet of the second socket pressure valve (27), be connected with fuel tank (22) through return filter (25).
3. constant pressure hydraulic station according to claim 2, is characterized in that, described pump group of often overlapping also comprises safety valve (18), high pressure filter (19) and one-way valve two (20); The outlet B of described constant pressure pump (16) is connected with safety valve (18) entrance, high pressure filter (19) entrance respectively, safety valve (18) outlet exports with return filter (25) entrance, the first socket pressure valve (26) respectively, the second socket pressure valve (27) exports and is connected, high pressure filter (19) outlet is connected with one-way valve two (20) entrance, when comprising at least two described pump groups of cover, the outlet parallel connection of often overlapping the one-way valve two (20) of pump group forms the pressure port (28) of hydraulic station.
4. the constant pressure hydraulic station according to claim 1,2 or 3, is characterized in that, also comprises draining filter (21), and often cover pump group also comprises oil absorption filter (12), ball valve one (14), ball valve two (17) and ball valve three (23); The inlet port S of described constant pressure pump (16) is connected with fuel tank (22) by oil absorption filter (12); The drain tap T often overlapping the constant pressure pump (16) of pump group is connected with draining filter (21) entrance through ball valve one (14), and draining filter (21) outlet is connected with fuel tank (22); First control mouth (X) of often overlapping the constant pressure pump (16) of pump group is connected through the entrance of ball valve two (17) with relief valve (24); Second of constant pressure pump controls mouth (Mst) and is connected through the pressure port P of ball valve three (23) with solenoid valve (13).
5. the constant pressure hydraulic station according to claim 1,2 or 3, is characterized in that, comprises three covers or three the above pump group of cover, wherein a set of as stand by pump group arbitrarily.
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| CN104989691B (en) * | 2015-07-10 | 2019-04-02 | 重庆市博平液压机械有限公司 | Hydraulic station concentrates pressure supply method |
| CN105673596B (en) * | 2016-04-05 | 2017-05-10 | 广东精铟海洋工程股份有限公司 | Double hydraulic control system with automatic pressure-maintaining function and test method of double hydraulic control system |
| CN107906084A (en) * | 2017-10-27 | 2018-04-13 | 中国铁建重工集团有限公司 | Rock drill and its hydraulic pressure drilling control system |
| CN109854547A (en) * | 2019-03-01 | 2019-06-07 | 兰州兰石能源装备工程研究院有限公司 | Long-range pressure regulation load-sensitive hydraulic station |
| CN112833064B (en) * | 2020-12-30 | 2022-08-30 | 广州白云液压机械厂有限公司 | Intelligent hydraulic station for numerical control machine tool |
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| CN101311020A (en) * | 2007-05-21 | 2008-11-26 | 沃尔沃建造设备控股（瑞典）有限公司 | Walking device for pedrail type heavy equipment |
| CN202673874U (en) * | 2012-06-25 | 2013-01-16 | 江苏海鹏特种车辆有限公司 | Constant-pressure variable control system of load sensitive hydraulic pump |
| CN102996537A (en) * | 2012-11-15 | 2013-03-27 | 四川宏华石油设备有限公司 | Power swivel stepless speed regulation hydraulic system |
| CN203009421U (en) * | 2012-11-15 | 2013-06-19 | 四川宏华石油设备有限公司 | Power swivel stepless speed regulation hydraulic system |
| CN203348184U (en) * | 2013-07-03 | 2013-12-18 | 上海汇益控制系统股份有限公司 | Hydraulic control device for offshore wind power piling |
| CN203685786U (en) * | 2014-01-28 | 2014-07-02 | 四川宏华石油设备有限公司 | Constant-pressure hydraulic station |
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| CN103727102A (en) | 2014-04-16 |
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