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Load self-adaptive safety valve adopting changeable throttling orifice

A safety valve, self-adaptive technology, applied in the field of hydraulic valves, can solve the problems of response time, control power difficult to meet the use requirements, short duration of strong impact load, high working pressure of hydraulic cylinder, etc., to achieve convenient implementation, low cost, large return effect

Active Publication Date: 2015-11-18
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The difficulty in solving this technical problem is that the hydraulic cylinders in the above-mentioned large-scale equipment have high working pressure, large flow, and short duration of strong impact loads. The response time and control power of existing control valves or control technologies are difficult to meet the use requirements.

Method used

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  • Load self-adaptive safety valve adopting changeable throttling orifice
  • Load self-adaptive safety valve adopting changeable throttling orifice

Examples

Experimental program
Comparison scheme
Effect test

Embodiment ( 1

[0021] see figure 1 , a load-adaptive safety valve with a variable orifice, including a valve core 1, a valve body 2, a pressure regulating spring 3, an adjusting nut 4, an upper chamber 5, a lower chamber 6, a flow hole 7, and an oil inlet valve port 8, channel 9, main oil inlet channel 10, main oil outlet channel 11, main valve port 12.

[0022] The hydraulic oil from the hydraulic system enters the lower cavity 6 through the main oil inlet channel 10, the channel 9, the valve port 8 and the flow hole 7. The forces acting on the spool 1 include upward hydraulic pressure, downward spring force, hydraulic force and frictional force when the spool 1 moves. When the resultant force acting on the spool 1 is downward, the main valve port 12 does not open, the main oil inlet passage 10 and the main oil outlet passage 11 do not communicate, and the safety valve closes. When the resultant force acting on the spool 1 is upward, the spool 1 moves upward, the main valve port 12 opens,...

Embodiment ( 2

[0026] see figure 2 , a load-adaptive safety valve with a variable orifice, including a valve core 1, a valve body 2, a pressure regulating spring 3, and an adjusting nut 4; the valve core and the valve body form an upper chamber 5 and a lower chamber 6, and the valve core There are flow holes 7, oil inlet valve ports 8 and channels 9 on the valve body, main oil inlet channels 10 connected with the hydraulic system, main oil outlet channels 11, and main valves formed between the valve core and the main oil outlet channels. Port 12; the hydraulic oil from the hydraulic system enters the upper chamber 5 of the valve core through the main oil inlet channel 10, channel 9, valve port 8, and the flow hole 7 set in the valve core, and the oil pressure in the upper and lower chambers 5 and 6 And the elastic force of the pressure regulating spring 3 makes the valve core 1 in a balanced static state. At this time, the main valve port 12 is not opened, the main oil inlet channel 10 and ...

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Abstract

The invention relates to a load self-adaptive safety valve adopting a changeable throttling orifice. Hydraulic oil from a hydraulic system passes a main oil inlet passage, a passage, a valve port and a through-flow hole arranged in a valve core, and then enters a valve core lower cavity; oil pressure in the lower cavity makes the valve core in a balanced static state; at this moment, a main valve port does not open, the main oil inlet passage is not communicated with a main oil outlet passage, and the safety valve closes. When equipment is subject to impact load, oil pressure supplied by the main oil inlet passage rises; the oil pressure in the lower cavity rises; the valve core moves upwards; accordingly, a communicating area of the through-flow hole and an oil inlet valve port is increased; pressure loss is decreased when fluid flows past the oil inlet valve port; the oil pressure in the lower cavity rises at accelerating speed; the valve core is driven to move upwards at accelerating speed, and the main valve port is driven to open at accelerating speed; so that communicating speed of the main oil inlet passage and the main oil outlet passage is increased; response time for the opening of the safety valve is shortened; the speed of the valve moving upwards is in positive correlation with the impact load.

Description

technical field [0001] The invention relates to a load self-adaptive safety valve adopting a variable throttling port, specifically, a safety valve whose flow area of ​​the throttling port changes with the position of a valve core, and belongs to the technical field of hydraulic valves. Background technique [0002] The hydraulic supports widely used in fully mechanized coal mining face are subject to strong impact when the old roof of the overlying surrounding rock breaks periodically. According to the geological conditions of the mining area, the old roof breaks every 8 to 40 meters, and the hydraulic support bears a strong impact. If the impact load is too large, the support will fail, and in severe cases, the safety of equipment and personnel on the working face will be endangered. In order to improve the adaptability and reliability of the hydraulic support, protect the column (hydraulic cylinder) in the hydraulic support, and reduce the pressure peak in the column und...

Claims

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Application Information

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IPC IPC(8): F16K17/04
CPCF16K17/04
Inventor 焦素娟郑辉华宏星
Owner SHANGHAI JIAO TONG UNIV
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