Pressure limiting device and engine
A pressure-limiting and pressure-limiting valve technology, applied in the direction of engine components, valve devices, mechanical equipment, etc., can solve problems affecting the normal operation of the engine, achieve the effect of reducing sensitivity and ensuring normal operation
Active Publication Date: 2022-04-26
WEICHAI POWER CO LTD
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Problems solved by technology
[0004] However, the spool will quickly close the connection channel between the second oil passage and the first oil passage, causing the main oil passage to generate oil pressure pulses, which will be fed back to the spool through the signal oil passage, and the oil pressure pulses will control the valve. The core opens the connection channel between the second oil passage and the first oil passage again, affecting the normal operation of the engine
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Embodiment Construction
[0043] The inventor of the present application found in the actual working process that: when the fluid pressure in the pipeline decreases, the valve core will quickly move upward along the axis of the valve body under the action of the elastic force of the spring to close the second oil passage and the first oil passage. The connecting passage between the oil passages stops the pressure relief. However, because the reset sensitivity of the pressure limiting valve is too high, on the one hand, the signal oil passage will receive a high oil pressure signal, causing the valve core to move downward along the axis of the valve body, and reopen the second oil passage and the first oil passage. The communication passage between the first oil passages is depressurized again, causing the fluid pressure in the pipeline to pulsate, affecting the normal use of the engine. On the other hand, the spool will collide violently with the inner cavity of the valve body, which will damage the sp...
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The invention provides a pressure limiting device and an engine, which relate to the technical field of engines. The pressure limiting device includes a columnar valve body, a pressure limiting valve core, a mounting seat and a pressure relief valve core installed in the columnar valve body in sequence, wherein the pressure limiting valve core A damping hole is provided on the pressure limiting spool; by setting a damping hole for communicating the first cavity and the second cavity on the pressure limiting spool, when the pressure limiting spool moves upward along the axis of the cylindrical valve body, the fluid in the first cavity It will enter the second chamber through the damping hole, and the size of the damping hole is small. The fluid entering the second chamber through the damping hole will generate a large resistance, reduce the sensitivity of the pressure limiting valve core reset, and avoid the signal oil channel. A high oil pressure signal prevents the spool from reopening the communication passage between the second oil passage and the first oil passage, thus ensuring the normal operation of the engine.
Description
technical field [0001] The invention relates to the technical field of engines, in particular to a pressure limiting device and an engine. Background technique [0002] In order to regulate and control the fluid pressure in the pipeline of the engine, a pressure limiting valve is usually set in the pipeline, and the pressure of the fluid is adjusted by adjusting the opening of the pressure limiting valve. [0003] In the related art, the pressure limiting valve includes a valve body, a spool disposed in the valve body, and a spring connected to the spool. The valve body has a second oil passage, a first oil passage, and a signal oil passage communicated with the inner cavity of the valve body. , when the pressure on the signal oil passage is greater than the spring force, the spool moves downward along the axis of the valve body, opening the communication channel between the second oil passage and the first oil passage to realize pressure relief; when the pressure on the sig...
Claims
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IPC IPC(8): F16K17/24
CPCF16K17/24
Inventor 刘洋申加伟田少聪
Owner WEICHAI POWER CO LTD