CN210599607U

CN210599607U - Oil supply valve communicated with pressure compensator

Info

Publication number: CN210599607U
Application number: CN201921606633.1U
Authority: CN
Inventors: 邹建柱
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-09-25
Filing date: 2019-09-25
Publication date: 2020-05-22
Anticipated expiration: 2029-09-25

Abstract

The utility model belongs to the technical field of hydraulic transmission and control system, in particular to intercommunication pressure compensator's fuel feed valve, including relief pressure valve, first check valve, liquid accuse switching-over valve and second check valve, two branch roads of producing oil are divided to the end of producing oil of relief pressure valve, one of them branch road with first check valve is connected, and another branch road is connected with the second check valve after passing through the normally open hydraulic fluid port of liquid accuse switching-over valve, the control port of liquid accuse switching-over valve with the oil-out of first check valve is connected, the utility model provides a intercommunication pressure compensator's fuel feed valve replaces the pilot pump in the former system, overflow valve through this fuel feed valve, can the efficient found hydraulic system power supply, replaces original pilot pump, overflow valve, has avoided the waste of the energy, can not produce the overflow loss. The valve can be flexibly arranged and can also be conveniently integrated in the existing valve group.

Description

Oil supply valve communicated with pressure compensator

Technical Field

The utility model relates to a technical field is hydraulic transmission and control system field, in particular to engineering machine tool hydraulic system, for the valves of a certain road system oil supply, the utility model relates to a intercommunication pressure compensator's fuel feeding valve.

Background

At present, in known engineering machinery hydraulic systems such as loaders, excavators and cranes, the control oil source of a hydraulic control reversing valve is mostly provided by a pilot pump, the pilot pump is installed in series behind a main oil pump or a steering pump or directly installed on an engine or a gearbox, a pump shaft is driven by power to rotate, oil is supplied to a pilot hydraulic system, namely a control oil path of the hydraulic control reversing valve, and the accumulator can be filled with liquid. As shown in fig. 1, fig. 1 is a schematic diagram of a loader hydraulic system commonly used at present, a pilot pump 7 is installed in series behind a main oil pump 10, an overflow valve 8 is installed at an outlet of the pilot pump 7, the pilot pump 7 supplies hydraulic oil to a pilot control valve 13 through a check valve 9 and simultaneously charges an accumulator 12, and the pilot control valve 13 is used for realizing reversing of a pilot-controlled reversing valve 14;

the normal operation of the pilot control valve 13 requires that the pressure in the oil supply pipeline is kept within the working range all the time, which requires that the pilot pump 7 operates all the time, and the overflow valve 8 at the outlet of the pilot pump 7 operates in an overflow state all the time, so that the system has the waste of energy sources, and the installation position of the pilot pump is not flexible enough.

SUMMERY OF THE UTILITY MODEL

The utility model provides a intercommunication pressure compensator's fuel feeding valve can solve the problem that points out among the background art.

The oil supply valve comprises a pressure reducing valve, a first one-way valve, a hydraulic control reversing valve and a second one-way valve, wherein an oil outlet end of the pressure reducing valve is divided into two oil outlet branches, one branch is connected with the first one-way valve, the other branch is connected with the second one-way valve after passing through a normally open oil port of the hydraulic control reversing valve, and a control port of the hydraulic control reversing valve is connected with an oil outlet of the first one-way valve.

The utility model provides a feed valve of intercommunication pressure compensator replaces through guide's pump, the overflow valve in this feed valve with former system, can the efficient found the hydraulic system power supply, replaces original guide's pump, overflow valve, has avoided the waste of the energy, can not produce the overflow loss. The valve can be flexibly arranged and can also be conveniently integrated in the existing valve group.

Drawings

Fig. 1 is a schematic diagram of a loader hydraulic system commonly used at present.

Fig. 2 is a hydraulic schematic diagram of the present invention.

Fig. 3 is a sectional structural view of the integrated valve body of the present invention.

Fig. 4 is a hydraulic schematic diagram of the two-way communication pressure compensator of the present invention.

Fig. 5 is a schematic diagram of a loader hydraulic system using the present invention.

Description of reference numerals:

reference numbers in the figures: the hydraulic control system comprises a pressure reducing valve 1, a first check valve 2, a pilot-operated directional control valve 3, a second check valve 4, a priority valve 5, a steering gear 6, a pilot pump 7, a pilot pump overflow valve 8, a check valve 9, a main oil pump 10, a steering pump 11, an energy accumulator 12, a pilot control valve 13, a pilot-operated directional control valve 14, a hydraulic cylinder 15, a steering cylinder 16, a two-way pressure compensator 17 and a hydraulic-operated directional control valve 18.

Detailed Description

In the following, an embodiment of the present invention will be described in detail with reference to the drawings, but it should be understood that the scope of the present invention is not limited by the embodiment.

As shown in fig. 2-5, the embodiment of the utility model provides a intercommunication pressure compensator's fuel feeding valve, including relief pressure valve 1, first check valve 2, pilot operated directional control valve 3 and second check valve 4, two branch roads of producing oil are divided to the end of producing oil of relief pressure valve 1, one of them branch road with first check valve 2 is connected, and another branch road is connected with second check valve 4 after passing through the normally open hydraulic fluid port of pilot operated directional control valve 3, the control mouth of pilot operated directional control valve 3 with the oil-out of first check valve 2 is connected, 13 fuel feeding of pilot operated control valve are given to 2 oil-outs of first check valve, the oil-out of second check valve 4 is connected with the spring chamber of priority valve 5 through the sensitive mouth of load, the oil inlet and the 5 oil-outs of priority valve of relief pressure valve 1 are connected.

In the embodiment, as shown in fig. 2-3, the pressure reducing valve 1, the first check valve 2, the hydraulic control directional valve 3, and the second check valve 4 form an oil supply valve communicating with the pressure compensator, wherein a control port of the hydraulic control directional valve 3 is connected to a point G of an oil outlet of the first check valve 2, the pressure reducing valve 1 and a spring cavity of the hydraulic control directional valve 3 discharge oil and release the oil together through a port T, the valve leads out one branch from a point M behind an oil outlet CF of the priority valve 5, so that hydraulic oil flows in from a port P of the oil supply valve, reaches a point H after passing through the pressure reducing valve 1, is divided into two paths at the point H, wherein one path enters the first check valve 2, the other path enters the second check valve 4 through a normally open port of the hydraulic control directional valve 3, then flows out from a port LS, passes through a point N and then enters a spring cavity of the priority valve 5 through a load sensitive port, the pressure of the spring cavity and the pressure of the CF opening are coordinated with each other, so that the pressure and the flow of the P opening of the oil supply valve are ensured.

One path of hydraulic oil entering the first check valve 2 can supply oil to the downstream elements through the outlet Pst and can also charge the accumulator. When the pressure of the hydraulic oil at the point G behind the first check valve 2 rises to a certain value, the pressure oil can push the hydraulic control reversing valve 3 to close the normally open oil port, so that the flow of the hydraulic oil at the point H to the port A is cut off, the conduction of the pressure at the point H to the port A and the priority valve 5LS is also cut off, at the moment, the pressure at the point G, namely the oil pressure flowing out of the port Pst, the pressure value is the highest set pressure of the pressure reducing valve 1, the oil supply pressure and the flow are ensured through the pressure reducing valve, the check valve and the hydraulic control reversing valve, and the pilot control valve 13 is enabled to normally work.

Combine fig. 4 to show, the utility model discloses being linked up on two way pressure compensator 17 by the intercommunication, M point draws forth the branch behind two way pressure compensator 17's the oil-out, lets hydraulic oil get into relief pressure valve 1, then the A mouth of whole fuel feeding valve goes out oil and connects the LS mouth at two way pressure compensator 17 through the N point, feeds back pressure to two way pressure compensator 17's spring chamber, can realize the same function of principle graph in the same fig. 1.

Combine fig. 5 to show, use the utility model discloses the loader hydraulic system who points out to original fig. 1 has been reformed transform, connects the P mouth and the A mouth of fuel feeding valve respectively and is M point behind the CF mouth of three-way pressure compensator priority valve 5 promptly, and LS mouth back N point, links fuel feeding valve T mouth to the oil tank, communicates fuel feeding valve Pst mouth to energy storage ware 12, and the fuel feeding valve both can give the 13 fuel feeding of pilot control valve, can fill liquid for energy storage ware 12 again. Compared with the original hydraulic schematic diagram in fig. 1, the existing hydraulic system replaces the pilot pump 7 and the overflow valve 8, so that the waste of energy is avoided, and the overflow loss is avoided.

The above disclosure is only for a few specific embodiments of the present invention, however, the present invention is not limited to the embodiments, and any changes that can be considered by those skilled in the art shall fall within the protection scope of the present invention.

Claims

1. The utility model provides a intercommunication pressure compensator's fuel feed valve, includes relief pressure valve (1), first check valve (2), hydraulic control switching-over valve (3) and second check valve (4), two branch roads of producing oil are divided to the end of producing oil of relief pressure valve (1), one of them branch road with first check valve (2) are connected, and another branch road is connected with second check valve (4) after passing through the normally open hydraulic fluid port of hydraulic control switching-over valve (3), the control mouth of hydraulic control switching-over valve (3) with the oil-out of first check valve (2) is connected.