CN201582247U - Oil return control device in hydraulic pump station - Google Patents
Oil return control device in hydraulic pump station Download PDFInfo
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- CN201582247U CN201582247U CN2009203150541U CN200920315054U CN201582247U CN 201582247 U CN201582247 U CN 201582247U CN 2009203150541 U CN2009203150541 U CN 2009203150541U CN 200920315054 U CN200920315054 U CN 200920315054U CN 201582247 U CN201582247 U CN 201582247U
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Abstract
The utility model provides an oil return control device in a hydraulic pump station, which belongs to the hydraulic technical field. The device solves the technical problems of high cost, quite large load and the like of an oil return device of a traditional hydraulic pump station. The hydraulic pump station comprises a main oil duct, an oil tank and a high-pressure pump; the high-pressure pump is respectively connected with the main oil duct and the oil tank; the outer end of the main oil duct is provided with an outlet, and the main oil duct is connected with the oil tank through an oil return pipe; the oil return control device comprises a one-way valve which is arranged on the oil return pipe and enables oil liquid to flow to the oil tank; the one-way valve is provided with a pressure reset mechanism capable of opening and closing the one-way valve; and the pressure reset mechanism is connected with a low-pressure pump capable of controlling the pressure reset mechanism to work. The oil return control device has the advantages of simple structure, lower cost, higher safety, stable working performance and low fault rate.
Description
Technical field
The utility model belongs to the hydraulics field, relates to the oil return control device in a kind of hydraulic power unit.
Background technique
Hydraulic power unit is a kind of power unit module of gathering parts such as fuel tank, motor, oil pump, conveyance conduit, control system, and the output port place that outside executive component such as oil hydraulic cylinder, oil hydraulic motor etc. are connected hydraulic power unit just can have been driven by hydraulic power unit.
Hydraulic power unit comprises that an end is connected with high-pressure service pump, the main oil gallery that an end is connected with delivery outlet, and the main oil gallery upper bifurcation is provided with return tube, high voltage power oil can be returned to fuel tank by return tube.In the market the hydraulic power unit control power oil whether main method of oil sump tank is that solenoid valve is set on return tube, controls the break-make of return tube by solenoid valve.Though this mode can be controlled oil return, solenoid valve is directly controlled the flow direction of high pressure oil, and suffered duty factor is bigger, causes Control Failure easily, and service time is shorter, and fault is many; And solenoid valve costs an arm and a leg, and cost is than higher.Present also comparative maturity of the technology of hydraulic power unit, the competition of each producer is relatively fiercer, can cause the decline of the market competitiveness after cost of production increases, and therefore researches and develops a kind ofly to control oil return control device stable, with low cost and have great importance.
Summary of the invention
The purpose of this utility model is the problems referred to above that exist at existing technology, and the oil return control device in a kind of reasonable in design, hydraulic power unit that control stability is good is provided.
The purpose of this utility model can realize by following technical proposal: the oil return control device in a kind of hydraulic power unit, hydraulic power unit comprises main oil gallery, fuel tank and high-pressure service pump, described high-pressure service pump is connected with fuel tank with main oil gallery respectively, described main oil gallery outer end has delivery outlet, this main oil gallery is communicated with fuel tank by a return tube, it is characterized in that, this oil return control device comprises the one-way valve that can make fluid single flow direction fuel tank that is arranged on the return tube, described one-way valve is provided with the pressure resetting-mechanism that this one-way valve is opened and closed, and described pressure resetting-mechanism links to each other with the low pressure pump that can control this pressure resetting-mechanism work.
The working principle of this device is as follows: the delivery outlet of main oil gallery connects outside actuator, high-pressure service pump is extracted power oil out and is delivered in the main oil gallery from fuel tank, when hydraulic power unit is in running order, low pressure pump pilot pressure resetting-mechanism is with the one-way valve closure, return tube is cut off, and power oil flows to outside actuator by output port; When work finishes when needing hydraulic power unit to quit work, low pressure pump pilot pressure resetting-mechanism is with this one-way valve opens, and the power oil in the main oil gallery is got back to fuel tank by return tube, and at this moment Wai Bu actuator quits work.This oil return control device adopts low pressure pump, one-way valve and pressure resetting-mechanism to replace expensive solenoid valve, utilizes the flow direction of the oil circuit control high voltage power oil of low pressure, good operating stability, and fault is few, can also play cost-effective effect.
In the oil return control device in above-mentioned a kind of hydraulic power unit, described pressure resetting-mechanism comprises the oil inlet pipe that an end is communicated with low pressure pump, the oil inlet pipe the other end links to each other with an oil cylinder, the spool of in-oil cylinder piston rod and above-mentioned one-way valve is connected, and is connected by an auxiliary return tube between described oil cylinder and the fuel tank.The pressure of working oil in the low pressure pump control oil cylinder makes piston rod that spool is held out against or unclamps, thereby plays the purpose that controlling non-return valve opens and closes.
In the oil return control device in above-mentioned a kind of hydraulic power unit, described oil inlet pipe and auxiliary return tube all are connected with the cavity of an opposite side with piston rod in the oil cylinder, and described auxiliary return tube is provided with throttle valve.
After the low pressure pump work fluid in the fuel tank is delivered in the oil inlet pipe, by oil inlet pipe to oil cylinder, act on the piston and and outwards eject piston rod, piston rod holds out against spool on the valve body of one-way valve, working oil unnecessary in the oil inlet pipe flows back to fuel tank by auxiliary return tube through throttle valve, can control the pressure of in-oil cylinder working oil by the throttle valve on the adjusting return tube, thereby the spool that makes one-way valve overcomes the pressure sealing one-way valve of the power oil in the main oil gallery, at this moment the outside transmitting power of whole hydraulic power unit, not oil return of high pressure oil; After low pressure pump quits work, working oil in the oil inlet pipe constantly is back to fuel tank by throttle valve, oil mass in the oil inlet pipe reduces pressure gradually and reduces, the power that piston rod acts on the spool of one-way valve diminishes, spool is backed down by power oil, and one-way valve is got through, and the working oil in the main oil gallery is got back to fuel tank by return tube, at this moment power oil is by off-load, and whole hydraulic power unit is output power not.
In the oil return control device in above-mentioned a kind of hydraulic power unit, also be provided with the directional control valve that to control this auxiliary return tube break-make on the described auxiliary return tube.When low pressure pump quits work, will assist return tube to cut off by directional control valve, make the working oil pressurize in the oil inlet pipe.
In the oil return control device in above-mentioned a kind of hydraulic power unit, described directional control valve is an electromagnetic direction valve.Solenoid valve can pass through the circuit remote control, and can jointly control with other control system.
In the oil return control device in above-mentioned a kind of hydraulic power unit, the spool of described one-way valve and the piston rod of oil cylinder are integral structure, and described spool is positioned at the top of piston rod.Piston rod and spool are made an integral body, can save material.
In the oil return control device in above-mentioned a kind of hydraulic power unit, be provided with spring in the cavity at described oil cylinder inner piston rod place, described spring one end withstands on the cylinder barrel end cap, and the other end withstands on the piston.Spring can play the effect of auxiliary buffering to piston.
In the oil return control device in above-mentioned a kind of hydraulic power unit, described low pressure pump and high-pressure service pump synchronous operation.When high-pressure service pump was worked, low pressure pump is synchronous working also, the outside output power of hydraulic power unit, and when high-pressure service pump stopped, low pressure pump also stopped simultaneously, the hydraulic power unit off-load.
Compared with prior art, this oil return control device comprises parts such as one-way valve, and cost is lower; Utilization utilizes the low pressure oil-way system to control the flow direction of the power oil of high pressure, and Security is than higher, stable work in work, and rate of fault is low; Whole low pressure oil circuit is reasonable in design, simple in structure.
Description of drawings
Fig. 1 is the fundamental diagram of this hydraulic power unit.
Fig. 2 is the structural drawing of the oil return control device of A portion among Fig. 1.
Among the figure, 1, main oil gallery; 2, high-pressure service pump; 3, return tube; 4, fuel tank; 5, one-way valve; 6, spool; 7, piston rod; 8, oil cylinder; 9, oil inlet pipe; 10, low pressure pump; 11, auxiliary return tube; 12, throttle valve; 13, directional control valve; 14, spring; 15, common one-way valve; 16, relief valve; 17, pressure gauge; 18, selector valve; 19, actuator; 20, piston; 21, motor.
Embodiment
Below be specific embodiment of the utility model and in conjunction with the accompanying drawings, the technical solution of the utility model is further described, but the utility model be not limited to these embodiments.
As shown in Figure 1, hydraulic power unit is a kind of power unit of gathering parts such as fuel tank 4, motor 21, high-pressure service pump 2, main oil gallery 1, return tube 3, main oil gallery 1 outside is provided with delivery outlet, some outside actuators 19 are connected on the delivery outlet of main oil gallery 1 such as oil hydraulic cylinder or oil hydraulic motor etc., and power oil enters in the actuator 19 and with its driving by delivery outlet.
Specifically, the oil circuit of the power oil of high pressure is as follows: from fuel tank 4 to high-pressure service pump 2, be delivered to main oil gallery 1 through high-pressure service pump 2 by common one-way valve 15 again, be connected with the pressure gauge 17 that can detect oil pressure on the main oil gallery 1, also be connected with the relief valve 16 of pressurize, be divided into two-way through a common one-way valve 15 again, the one road to delivery outlet, another road connects return tube 3, and return tube 3 connects fuel tank 4.Delivery outlet can be connected by the actuator 19 of a selector valve 18 with the outside.
On return tube 3, be connected with oil return control device, comprise the one-way valve 5 that can make fluid single flow direction fuel tank 4 that is arranged on the return tube 3, one-way valve 5 is provided with the pressure resetting-mechanism that this one-way valve 5 is opened and closed, and is connected with the low pressure pump 10 that can control this pressure resetting-mechanism work on the pressure resetting-mechanism.The pressure resetting-mechanism comprises the oil inlet pipe 9 that an end is communicated with low pressure pump 10, oil inlet pipe 9 the other ends link to each other with an oil cylinder 8, be connected with a common one-way valve 15 on the oil inlet pipe 9, piston rod 7 in the oil cylinder 8 is connected with the spool 6 of above-mentioned one-way valve 5, be connected by an auxiliary return tube 11 between oil cylinder 8 and the fuel tank 4, oil inlet pipe 9 and auxiliary return tube 11 all with in the oil cylinder 8 are connected with the cavity of piston rod 7 opposite sides, and auxiliary return tube 11 is provided with throttle valve 12.Also be provided with the directional control valve 13 that can control these auxiliary return tube 11 break-makes on the auxiliary return tube 11, this directional control valve 13 is an electromagnetic direction valve in the present embodiment, but also can be common directional control valve or leading type directional control valve as another kind of situation.When low pressure pump 10 quits work, will assist return tube 11 to cut off by directional control valve, make the working oil pressurize in the oil inlet pipe 9.Electromagnetic direction valve can pass through the circuit remote control, and can jointly control with other control system.This low pressure pump 10 and high-pressure service pump 2 synchronous operations, when high-pressure service pump 2 work, low pressure pump 10 is synchronous working also, the outside output power of hydraulic power unit, when high-pressure service pump 2 stopped, low pressure pump 10 also stopped simultaneously, the hydraulic power unit off-load, but also can be asynchronous as another kind of scheme, low pressure pump 10 can independently be worked.
As shown in Figure 2, when the module of the oil return control device of reality is made, be integral structure with the spool 6 of one-way valve 5 and the piston rod 7 of oil cylinder 8, spool 6 is positioned at the top of piston rod 7.Piston rod 7 and spool 6 are made an integral body, can save material.In the present embodiment, electromagnetic direction valve 13 and throttle valve 12 are fixed on the bottom cylinder cap of oil cylinder 8, have in the oil cylinder 8 in the cavity of a side of piston rod 7 and be provided with spring 14,, can play the effect of buffering by the elastic strain of spring 14 piston 20 because this cavity does not have fluid.And the valve body of one-way valve 5 and the upper cylinder cover of oil cylinder 8 be made of one, utilize the spool 6 of the top of piston rod 7 as one-way valve 5.
After low pressure pump 10 work fluid in the fuel tank 4 is delivered in the oil inlet pipe 9, by oil inlet pipe 9 to oil cylinder 8, act on the piston 20 and and outwards eject piston rod 7, piston rod 7 holds out against spool 6 on the valve body of one-way valve 5, working oil unnecessary in the oil cylinder 8 flows back to fuel tank 4 by auxiliary return tube 11 through throttle valve 12, can control the pressure of the working oil in the oil cylinder 8 by regulating the throttle valve 12 of assisting on the return tube 11, thereby the spool 6 that makes one-way valve 5 overcomes the pressure sealing one-way valve 5 of the power oil in the main oil gallery 1, at this moment the outside transmitting power of whole hydraulic power unit, not oil return of high pressure oil; After low pressure pump 10 quits work, working oil in the oil inlet pipe 9 constantly is back to fuel tank 4 by throttle valve 12, oil mass in the oil inlet pipe 9 reduces pressure gradually and reduces, the power that piston rod 7 acts on the spool 6 of one-way valve 5 diminishes, spool 6 is backed down by power oil, and one-way valve 5 is got through, and the working oil in the main oil gallery 1 is got back to fuel tank 4 by return tube 3, at this moment power oil is by off-load, and whole hydraulic power unit is output power not.This oil return control device adopts low pressure pump 10, one-way valve 5 and pressure resetting-mechanism to replace expensive solenoid valve, utilizes the flow direction of the oil circuit control high voltage power oil of low pressure, good operating stability, and fault is few, and cost is low.
Specific embodiment described herein only is that the utility model spirit is illustrated.The utility model person of ordinary skill in the field can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present utility model or surmount the defined scope of appended claims.
Claims (8)
1. the oil return control device in the hydraulic power unit, hydraulic power unit comprises main oil gallery (1), fuel tank (4) and high-pressure service pump (2), described high-pressure service pump (2) is connected with fuel tank (4) with main oil gallery (1) respectively, described main oil gallery (1) outer end has delivery outlet, this main oil gallery (1) is communicated with fuel tank (4) by a return tube (3), it is characterized in that, this oil return control device comprises the one-way valve (5) that can make fluid single flow direction fuel tank (4) that is arranged on the return tube (3), described one-way valve (5) is provided with the pressure resetting-mechanism that this one-way valve (5) is opened and closed, and described pressure resetting-mechanism links to each other with the low pressure pump (10) that can control this pressure resetting-mechanism work.
2. the oil return control device in the hydraulic power unit according to claim 1, it is characterized in that, described pressure resetting-mechanism comprises the oil inlet pipe (9) that an end is communicated with low pressure pump (10), oil inlet pipe (9) the other end links to each other with an oil cylinder (8), piston rod (7) in the oil cylinder (8) is connected with the spool (6) of above-mentioned one-way valve (5), assists return tube (11) to be connected by one between described oil cylinder (8) and the fuel tank (4).
3. the oil return control device in the hydraulic power unit according to claim 2, it is characterized in that, described oil inlet pipe (9) and auxiliary return tube (11) all with in the oil cylinder (8) are connected with the cavity of the opposite side of piston rod (7), and described auxiliary return tube (11) is provided with throttle valve (12).
4. the oil return control device in the hydraulic power unit according to claim 3 is characterized in that, also is provided with on the described auxiliary return tube (11) to control the directional control valve (13) that should assist return tube (11) break-make.
5. the oil return control device in the hydraulic power unit according to claim 4 is characterized in that, described directional control valve (13) is an electromagnetic direction valve.
6. according to the oil return control device in claim 2 or the 3 or 4 described hydraulic power units, it is characterized in that, the spool (6) of described one-way valve (5) and the piston rod (7) of oil cylinder (8) are integral structure, and described spool (6) is positioned at the top of piston rod (7).
7. according to the oil return control device in claim 2 or the 3 or 4 described hydraulic power units, it is characterized in that, be provided with spring (14) in the cavity at described oil cylinder (8) inner piston rod (7) place, described spring (14) one ends withstand on the cylinder barrel end cap, and the other end withstands on the piston (20).
8. according to the oil return control device in claim 2 or the 3 or 4 described hydraulic power units, it is characterized in that described low pressure pump (10) and high-pressure service pump (2) synchronous operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203150541U CN201582247U (en) | 2009-11-18 | 2009-11-18 | Oil return control device in hydraulic pump station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203150541U CN201582247U (en) | 2009-11-18 | 2009-11-18 | Oil return control device in hydraulic pump station |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201582247U true CN201582247U (en) | 2010-09-15 |
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ID=42724247
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009203150541U Expired - Fee Related CN201582247U (en) | 2009-11-18 | 2009-11-18 | Oil return control device in hydraulic pump station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201582247U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102141063A (en) * | 2011-04-22 | 2011-08-03 | 广东科达机电股份有限公司 | Large-scale upper oil tank hydraulic power unit |
-
2009
- 2009-11-18 CN CN2009203150541U patent/CN201582247U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102141063A (en) * | 2011-04-22 | 2011-08-03 | 广东科达机电股份有限公司 | Large-scale upper oil tank hydraulic power unit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100915 Termination date: 20121118 |