A dynamic visualization test device and test method for a diesel engine unit pump fuel system balance valve
A technology of fuel system and test device, which can be used in measurement devices, testing of mechanical parts, testing of machine/structural parts, etc., and can solve problems such as valve core vibration, pressure drop, and unfavorable fuel injection by injectors.
Active Publication Date: 2017-11-21
BEIJING UNIV OF TECH
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Problems solved by technology
In this case, when the fuel pressure rises, if the sum of the force on the spool and the spring force is greater than the electromagnetic force, the spool will open to drain oil and cause the pressure in the control chamber to drop, which is not conducive to the fuel injection of the injector. At the same time, the highly turbulent flow and bubble movement at the cone surface will cause mechanical damage to the control valve, and cause vibration of the valve core, resulting in noise
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[0017] Such as figure 1 As shown, a dynamic visualization test device and test method for the balance valve of the diesel unit pump fuel system, including a drive motor, an oil pump, a high-pressure oil pipe, a pressure regulator tank, a balance valve, a displacement sensor, an industrial endoscope, a computer, and an electronic control system , data acquisition system, fuel tank.
[0018] Such as figure 2 As shown, a dynamic visual test device for the balance valve of the diesel unit pump fuel system, including the valve core (1), the thrust baffle (2), the valve body (3), the spring seat (4), and the push rod (5) , gland (6), compression spring (7), drain hole (8), valve core seat (9), oil return hole (10).
[0019] The spool (1) is made of quartz glass and can move in the valve chamber; the spool seat (9) is metal and glued to the spool.
[0020] The valve core (1) and the valve core seat (9) are installed inside the valve body (3), and the spring seat (4) and the press...
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A balance valve dynamic visualization test device and test method of a diesel engine unit pump fuel oil system belong to the diesel engine field, and are used for observing the fuel oil flow condition on a conical surface of a balance valve. The device includes a valve core, a location cylinder, a thrust baffle, a valve body, a spring base, a push rod, a gland, a pressure spring, and a valve core base. Through adjustment of the pressure at an entrance of the balance valve, the stress balance of valve core is changed, and under the combined action of the fuel oil pressure and the spring force the valve core reaches the balance state, furthermore a relation of the valve core motion and the flow field change in a flow channel is explored. The balance valve dynamic visualization test device and test method of the diesel engine unit pump fuel oil system can obtain the relation of the pressure and the bubble development variation by simulating the air flow of the unit pump balance valve, and can observe the dynamic change process of the fuel oil flow on the conical surface of the balance valve in real time.
Description
technical field [0001] The invention relates to a dynamic visualization test device and test method for a fuel system balance valve of a single pump of a diesel engine and belongs to the technical field of diesel engines. Background technique [0002] The electronically controlled unit pump fuel system realizes fuel injection control by controlling the conduction or cut-off of high-pressure fuel and low-pressure fuel through a solenoid valve. When the solenoid valve is energized and the spool is closed, the fuel exerts equal force on the left and right taper surfaces of the spool, and the spool is equivalent to a balance valve. When the solenoid valve is powered off, the high-pressure fuel will flow into the low-pressure oil circuit through a small flow area in a short time. This process takes a very short time and the pressure state changes with a large gradient. Since the actual processing cannot be truly idealized, that is, the bore diameter of the valve cavity is equal ...
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IPC IPC(8): G01M13/00
CPCG01M13/00
Inventor 雷艳高壮仇滔
Owner BEIJING UNIV OF TECH