CN105628359A

CN105628359A - Balance valve dynamic visualization test device and test method of diesel engine unit pump fuel oil system

Info

Publication number: CN105628359A
Application number: CN201510999941.5A
Authority: CN
Inventors: 雷艳; 高壮; 仇滔
Original assignee: Beijing University of Technology
Current assignee: Beijing University of Technology
Priority date: 2015-12-27
Filing date: 2015-12-27
Publication date: 2016-06-01
Anticipated expiration: 2035-12-27
Also published as: CN105628359B

Abstract

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

A kind of diesel engine single body pump prime the fuel system equilibrium valve dynamic and visual testing apparatus and test method

Technical field

The present invention relates to a kind of diesel engine single body pump prime the fuel system equilibrium valve dynamic and visual testing apparatus and test method, belong to Diesel Engine Technique Field.

Background technology

Automatically controlled monoblock pump prime the fuel system realizes fuel Injection Control by conducting or the cut-out of solenoid control high pressure fuel and low-voltage fuel. When magnetic valve energising, when spool closes, fuel oil is equal to spool left and right conical surface reactive force, and spool part is equivalent to equilibrium valve. When magnetic valve power-off, high pressure fuel flows into low pressure oil way by within very short time by very little circulation area, and this process time is very short, and pressure state variable gradient is bigger. Owing to reality processing cannot be accomplished real idealized, namely valve chamber internal orifice dimension is equal everywhere, and letting out oil stomidium footpath, to be greater than valve chamber inner, and the stressed area in spool two directions will be caused inequal, and hydraulic pressure power can make the trend of the oriented opening direction motion of spool.

Along with miniaturization and the low voltage drive of monoblock pump, it is desired to magnetic valve and armature size are more and more less, and then reduce electromagnetic force. Accordingly, control valve return spring force also must reduce. In this case, while fuel pressure raises, if spool is greater than electromagnetic force by power and spring power sum, spool will be opened and let out oil and cause pressure drop in control chamber, it is unfavorable for oil thrower oil spout, conical surface place high turbulence and bubble motion will cause control valve physical abuse simultaneously, and cause disc vibration, produce noise. Therefore, the mechanism understanding equilibrium valve fuel oil cavitating flows in monoblock pump prime the fuel system in depth is very necessary.

Summary of the invention

The present invention proposes a kind of diesel engine single body pump prime the fuel system equilibrium valve dynamic and visual testing apparatus and test method, it is possible to observe the fuel flow situation at equilibrium valve conical surface place. Object is the mechanism in order to understand fuel oil cavitating flows phenomenon in equilibrium valve place in diesel engine single body pump prime the fuel system, for the optimization design of monoblock pump equilibrium valve provides foundation.

A kind of diesel engine single body pump prime the fuel system equilibrium valve dynamic and visual testing apparatus, it is characterized in that: comprise spool (1), thrust baffle (2), valve body (3), spring support (4), push rod (5), gland (6), compression spring (7), oil leak hole (8), spool seat (9) and oil return hole (10); Spring support (4) and compression spring (7) it is provided with between described spool seat (9) and push rod (5); Described gland (6) has through hole for monitoring the change in displacement of spool (1), gland (6) and valve body (3) bolted; Described valve body (3) is provided with outlet-port and oil leak hole; Described spool (1) is made up of silica glass, with spool seat (9) with extremely gluing; Described push rod (5) is threaded with spool seat (9); Described thrust baffle has through hole on (2), thrust baffle (2) and valve body (3) screw threads for fastening.

Assembling following system, this system comprises drive-motor, oil pump, high-pressure line, buffer tank, visual testing apparatus displacement sensor, industrial endoscope, inlet pressure transducer and outlet pressure sensor; Motor drives oil pump pump oil, is connected with purifier between oil pump and fuel tank, and high-pressure line connects oil pump and buffer tank; Inlet pressure transducer is installed on visual testing apparatus oil-in end, monitoring valve import oil pressure change; Outlet pressure sensor is installed on oil outlet end monitoring top hole pressure; Displacement sensor is settled to survey disc vibration displacement in the through hole of gland rear end; Industrial endoscope is inserted in the through hole in thrust baffle, can adjust distance observation spool end fuel flow changing condition in front and back;

Regulate oil pump, increase oil pump pump oil amount, buffer tank stablizes oil circuit pressure, and when the end-acted power of cartridge outlet is greater than spring power and fuel oil to aft end face reactive force sum by fuel oil, spool is opened, fuel oil releases, the end-acted power of cartridge outlet reduces, and spool is taken a seat, displacement sensor valve core movement rule in this process, pressure in synchro measure runner, and in observational data valve moving process, gas-liquid two-phase mixed flow is with the rule of spool lift variation and fuel pressure change.

Different with the light intensity of liquid phase reflected light according to gas phase, judge cavitation effect by industrial endoscope photograph brightness.

It is provided with spring support and pressure spring between described spool seat and push rod, makes spool be in normally off.

Described thrust baffle is provided with through hole, and interior rubber plug places industrial endoscope, and owing to gas phase is different with the light intensity of liquid phase reflected light, data collecting system process can draw flow field and bubble development and change rule.

Described cone valve is provided with oil return hole and oil leak hole, it is possible to reduce the leakage at spool seat place.

Invention has following feature: 1, owing to adopting industrial endoscope, and observation end is in the low-pressure section of testing apparatus, therefore, it is possible to measure cavitating flows parameter and observation bubble development and change. 2, quartz spool and spool seat are with extremely gluing, pressure spring is had to support between spool seat and push rod, such spool is in normally off, when exit end reactive force is greater than spring elastic force and aft end face reactive force sum by hydraulic pressure power, spool will be opened, and can simulate the dynamic process of equilibrium valve flowing like this.

Accompanying drawing explanation

Fig. 1 is the systematic testing schematic diagram of inventive method;

Fig. 2 is the structural representation of the inventive method application device (equilibrium valve);

Fuel flow schematic diagram when Fig. 3 is that in process of the test of the present invention, spool is opened;

Label illustrates: 1-spool, 2-thrust baffle, 3-valve body, 4-spring support, 5-push rod, 6-gland, 7-pressure spring, 8-oil leak hole, 9-spool seat, 10-oil return hole.

Embodiment

As shown in Figure 1, a kind of diesel engine single body pump prime the fuel system equilibrium valve dynamic and visual testing apparatus and test method, comprise drive-motor, oil pump, high-pressure line, buffer tank, equilibrium valve, displacement sensor, industrial endoscope, computer, electronic system, data collecting system, fuel tank.

As shown in Figure 2, a kind of diesel engine single body pump prime the fuel system equilibrium valve dynamic and visual testing apparatus, comprises spool (1), thrust baffle (2), valve body (3), spring support (4), push rod (5), gland (6), compression spring (7), oil leak hole (8), spool seat (9), oil return hole (10).

Described spool (1) is made for silica glass, can move in valve chamber; Described spool seat (9) is metal, with spool with extremely gluing.

It is inner that spool (1) and spool seat (9) are installed on valve body (3), and mounting spring seat (4) and pressure spring (7) between push rod (5), push rod (5) is threaded with spool seat (9).

Gland (6) and valve body (3) bolted, there is through hole at gland (6) center, and displacement sensor is placed in valve body outside, can be used for monitoring the motion change process of spool.

Also comprise the inlet pressure transducer and outlet pressure sensor that are installed on inlet end. Inlet pressure transducer can measure the inlet pressure of equilibrium valve, and outlet pressure sensor can be measured and flow through cavity pressure after the conical surface, pressure signal feeds back to data collecting system afterwards and carries out data processing, can obtain inlet and outlet pressure change curve.

Test is initial, regulating oil pump, increase oil pump pump oil amount, buffer tank stablizes oil circuit pressure, when the end-acted power of cartridge outlet is greater than spring power and fuel oil to aft end face reactive force sum by fuel oil, spool is opened, and fuel oil releases, and the end-acted power of cartridge outlet reduces, spool is taken a seat, displacement sensor valve core movement rule in this process, the pressure in synchro measure runner, and in observational data valve moving process, gas-liquid two-phase mixed flow is with the rule of spool lift variation and fuel pressure change.

Claims

1. a diesel engine single body pump prime the fuel system equilibrium valve dynamic and visual testing apparatus, it is characterized in that: comprise spool (1), thrust baffle (2), valve body (3), spring support (4), push rod (5), gland (6), compression spring (7), oil leak hole (8), spool seat (9) and oil return hole (10); Spring support (4) and compression spring (7) it is provided with between described spool seat (9) and push rod (5); Described gland (6) has through hole for monitoring the change in displacement of spool (1), gland (6) and valve body (3) bolted; Described valve body (3) is provided with outlet-port and oil leak hole; Described spool (1) is made up of silica glass, with spool seat (9) with extremely gluing; Described push rod (5) is threaded with spool seat (9); Described thrust baffle has through hole on (2), thrust baffle (2) and valve body (3) screw threads for fastening.

2. apply the visual test method of device as claimed in claim 1, it is characterised in that: assembling following system, this system comprises drive-motor, oil pump, high-pressure line, buffer tank, visual testing apparatus displacement sensor, industrial endoscope, inlet pressure transducer and outlet pressure sensor;

Motor drives oil pump pump oil, is connected with purifier between oil pump and fuel tank, and high-pressure line connects oil pump and buffer tank; Inlet pressure transducer is installed on visual testing apparatus oil-in end, monitoring valve import oil pressure change; Outlet pressure sensor is installed on oil outlet end monitoring top hole pressure; Displacement sensor is settled to survey disc vibration displacement in the through hole of gland rear end; Industrial endoscope is inserted in the through hole in thrust baffle, can adjust distance observation spool end fuel flow changing condition in front and back;

3. a kind of diesel engine single body pump prime the fuel system equilibrium valve dynamic and visual testing apparatus according to claim 1, it is characterised in that: different with the light intensity of liquid phase reflected light according to gas phase, judge cavitation effect by industrial endoscope photograph brightness.