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Reversing valve and manual hydraulic pump with same

A reversing valve and valve body technology, which is applied to the components, pumps, piston pumps, etc. of the pumping device for elastic fluid, can solve the problems that the reversing valve hole cannot be rigidly sealed, and the sealing sleeve is easily scratched. Conducive to rigid sealing, good sealing effect and good durability

Inactive Publication Date: 2012-12-12
上海中欧汽车电器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Through analysis, the design defects of the existing technology are: in order to realize the pressure relief function, the reversing valve hole system is designed to be opened in the annular groove, which causes the sealing sleeve to protrude and is easily scratched, and the reversing valve hole system is not connected with the pump Body cannot be rigidly sealed

Method used

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  • Reversing valve and manual hydraulic pump with same
  • Reversing valve and manual hydraulic pump with same
  • Reversing valve and manual hydraulic pump with same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] like figure 2 , 3 Shown is a schematic diagram of the overall appearance and structure of the hydraulic pump and a sectional structure diagram of A-A. The pump body 30 is partly integrated inside the oil tank 50 , and the reversing valve, plunger 40 and the like are integrated inside the pump body 30 . The pump body hole system has a pump body oil return port 31, a lower chamber hole section 32, an upper chamber hole section 33, and a pump body oil inlet port 34; the pump body oil inlet port 34 communicates with the oil tank 50 through the upper valve body 20, and the lower chamber hole The section 32 and the upper chamber hole section 33 communicate with the lower chamber nozzle 36 and the upper chamber nozzle 35 which are threadedly connected to the outer end of the bottom of the pump body 30 respectively, and communicate with the upper chamber (rod chamber) of the hydraulic cylinder (not shown in the figure) through the high-pressure oil pipe and the lower chamber...

Embodiment 2

[0053] The difference between this embodiment and Embodiment 1 is that the designs of A, B, and C cavities 12, 13, and 14 are different, such as Figure 9 , 10 As shown, A, B, and C holes 12, 13, and 14 are directly opened as through holes with the same radial section instead of stepped holes, and no sealing sleeve is installed, and the distribution shaft hole system and the pump body are completely matched precisely. rigid seal. The present embodiment has a single sealing method, which is not as preferred as Embodiment 1.

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Abstract

The invention discloses a reversing valve and a manual hydraulic pump with the same. The technical scheme includes that the reversing valve comprises a valve body, an A hole cavity, a B hole cavity, a C hole cavity, a ring-shaped oil groove, apressure release groove and an oil return groove, the radial section of the valve body is used as a reference, and the A hole cavity, the B hole cavity and the C hole cavity which are communicated with one another and distributed at different angles are arranged at the same section positions along the radial direction of the valve body; the ring-shaped oil groove is arranged on the circumferential surface of the valve body and located on the section which is different from the section where the A hole cavity, the B hole cavity and the C hole cavity are located; and the rotation direction of the reversing valve from an ascending position to a descending direction is used as a reference, the pressure release groove is arranged on the circumferential surface between the B hole cavity and the C hole cavity, the oil return groove is opened on the circumferential surface between the A hole cavity and the B hole cavity, and the pressure release groove and the oil return groove are communicated with the ring-shaped oil groove respectively. According to the reversing valve and the manual hydraulic pump with the reversing valve, by means of a sealing mode of rigid and flexible combination, sealing sleeves are difficult to cut and rub by holes, the sealing performance is good, and the durability is high.

Description

technical field [0001] The invention relates to a hydraulic tilting and lifting device for lifting a car cab or similar devices, in particular to a manual hydraulic pump used to provide power in the hydraulic tilting and lifting device, and in particular to a reversing valve of the hydraulic pump. Background technique [0002] It is known that if the cab of the car needs to be flipped over a large angle, especially when the center of gravity is turned over, the cab cannot be lowered by its own weight, and a double-circuit hydraulic flip-lifting device is needed, which uses the retraction of the hydraulic cylinder piston rod to drive the driving. The chamber turns over the center of gravity to realize the descent. [0003] In the prior art, the manual hydraulic pump that provides power for this double-circuit hydraulic tilting and lifting device includes a fuel tank, a pump body, a plunger integrated in the pump body, and a reversing valve (here, the reversing valve is used i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B53/10F04B9/14
Inventor 吴国琳戴宇新
Owner 上海中欧汽车电器有限公司
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