JPH0127256B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a testing device for injection valves installed in large diesel engines mounted on ships.

B. Prior Art Vessels equipped with Burmeister & Wain type (hereinafter referred to as B&W type) large diesel engines are usually equipped with a fuel valve injection test device to test and adjust the operating status of the spare injection valves installed in the diesel engine. be. And while sailing,
Maintenance and inspections are carried out using a fuel valve injection testing device to ensure that spare injection valves are always in the best condition. Incidentally, the fuel valve injection test device is used not only during navigation but also on land.

FIG. 1 is a diagram showing an example of an injection valve 1 whose operating state is tested by the fuel valve injection test device. In the figure, 2 is a valve body, 3 is a nozzle fixed to the tip of the valve body 2 via a cap nut 4, and 5 is a needle slidably housed in holes 2a and 3a provided in the valve body 2 and nozzle 3. be. The tip of the needle 5 is in contact with a conical valve seat 3b provided in the nozzle 3, and the rear end is in pressure contact with a spring 6 housed in the valve body 2, and the tip of the needle 5 is pressed by the spring 6. is in pressure contact with the valve seat 3b. Note that the pressing force by the spring 6 is the same as that of the valve body 2.
Adjustment is possible using a bolt 7 screwed into the. 8 is an oil supply hole for supplying fuel into the pressure reservoir 3c provided in the nozzle 3, 9 is a circulation valve communicating with the oil supply hole 8, and the circulation valve 9 has a capacity of 30 kg/ It is designed to open with a weak pressure of about cm ² .

In the above configuration, in order to inject fuel from the tip of the nozzle 3 of the injection valve 1, a fuel pump (not shown) is required.
Fuel is force-fed from the pump to the circulation valve 9 and pressure is applied to the circulation valve 9 to open the circulation valve 9 and open the fuel supply hole 8 communicating with the circulation valve 9. Fuel is pumped into the pressure reservoir 3c through the pressure reservoir 3c. At this time, the air in the oil supply hole 8 and the pressure reservoir 3c flows through the nozzle 3 and the holes 3a, 2a provided in the valve body 2.
The water is discharged to the outside through a drain hole 10 provided in the valve body 2 through a minute gap formed between the needle 5 inserted into the holes 3a and 2a. When the pressure of the fuel accumulated in the pressure reservoir 3c reaches a predetermined value, the needle 5 is pushed up against the elastic force of the spring 6, and the small hole 3d provided at the tip of the nozzle 3 is pushed up.
Fuel is injected from.

By the way, the B&
In recent years, energy saving measures have been implemented in W-type diesel engines, and fuel injected from the injection valve 1 has also come to be injected at high pressure and high speed.

Therefore, the pressure applied to the needle 5 by the spring 6 of the injection valve 1 has been increased from about 250 Kg/cm ² to about 350 Kg/cm ² .

However, as the pressure and speed of the injector 1 increases, conventional fuel valve injection test equipment is unable to supply fuel to the injector 1 at a sufficient speed and amount during testing, making it difficult to perform accurate tests. A problem has arisen where there is no such thing.

(b) Object of the Invention It is an object to provide a fuel valve injection test device that can sufficiently cope with injection valves that have increased pressure and speed as an energy saving measure.

C. Structure of the Invention A fuel valve injection test device includes an air booster consisting of a plunger pump that supplies fuel to an injection valve at a predetermined pressure, an air cylinder for driving the plunger pump, and an air booster that supplies air to the air cylinder. An injection switching valve for switching the supply direction, an air source for supplying air to the air cylinder via the injection switching valve, and a fuel tank for storing fuel supplied to the injection valve by the plunger pump. , and a high-pressure switching valve interposed between the discharge hole of the plunger pump and the injection valve.

D. Embodiment FIG. 2 is a system diagram showing a circuit configuration of a fuel valve injection test device according to the present invention. In the figure, 20 is a plunger pump 21 for pressure-feeding fuel to the injection valve 1.
and an air cylinder 23 for reciprocating the plunger 22 of the plunger pump 21. A suction hole 24 provided in the plunger pump 21 of the air booster 23 is connected to a fuel tank 25 that stores fuel to be pumped to the injection valve 1.
is communicated with via an oil filter 26,
In addition, the discharge hole 27 is connected to a high pressure switching valve 28 and a high pressure hose 2.
It is connected to the injection valve 1 via 9.
Further, a first intake/exhaust hole 30 provided in the air cylinder 23 of the air booster 20 is connected to an air source 32 or a first muffler 33 via an injection switching valve 31, and a second intake/exhaust hole 34 is connected to an injection switching valve 31. 31
via the air source 32 or second muffler 35
It is designed to be connected to. When the injection switching valve 31 is in the illustrated state, the first intake/exhaust hole 30 is connected to the first muffler 33 and the second intake/exhaust hole 34 is connected to the air source 32, so that the air cylinder 23 is The piston 36 slides to the right in the figure, and the plunger 22 of the plunger pump 21, which is connected to the piston rod 37 of the air cylinder 23, slides in the suction direction (to the right in the figure). Furthermore, when the injection switching valve 31 is located in the opposite direction to that shown in the figure, the first intake/exhaust hole 30 is connected to the air source 32.
By connecting the second intake and exhaust hole 34 with the second muffler 35, the air cylinder 23
The cylinder 36 slides to the left in the figure, causing the plunger 22 of the plunger pump 21 connected to the piston rod 37 of the air cylinder 23 to slide in the discharge direction (to the left in the figure). The first muffler 33 is smaller than the second muffler 35 and has greater exhaust resistance than the second muffler 35.
A throttle slit 38 is provided between the injection switching valve 31 and the injection switching valve 31.
is interposed. Therefore, when the injection switching valve 31 is switched to cause the piston 36 of the air cylinder 23 to reciprocate, the piston 36 is connected to the plunger pump 21.
When sliding the plunger 22 in the discharge direction, the plunger 22 moves at high speed and the piston 3
6 slides the plunger 22 in the suction direction, the first muffler 33 and the throttle slit 3
The exhaust resistance 8 causes the pump to move at a low speed, thereby ensuring that the plunger pump 22 sucks in fuel and at the same time discharges the sucked fuel at a high speed. In addition, the air booster 20 has an air pressure of 7 kg/cm from the air source 32.
The dimensions of each member are determined so that a maximum pressure of 700 Kg/cm ² can be generated when the pressure is 700 Kg/cm ² . 39,40,4
Reference numerals 1 and 42 indicate an air filter, an air regulator, a safety valve, and an oiler, which are interposed between the air source 32 and the injection switching valve 31, and the oiler 42 uses the air circuit to control the air booster 20.
It supplies lubricating oil to the Further, in the figure, 43 is an air pressure gauge that measures the pressure of air supplied from the air source, and 44 is a high-pressure pressure gauge that measures the discharge force of the fuel discharged from the plunger pump 21.

FIGS. 3 to 5 are drawings showing the external shape of a fuel valve injection test device housing various parts shown in the system diagram of FIG. 2. FIG. In the figure, 45 is the main body of the fuel valve injection test device, and inside the main body 45 are:
An air booster 20, a high pressure switching valve 28, an injection switching valve 31, an air filter 39, an air regulator 40, a safety valve 41 and an oiler 42 are built in, and the front panel 46 has an air pressure gauge 4.
3 and a high-pressure pressure gauge 44 are attached, and an operating lever 28a for operating the high-pressure switching valve 28, the injection switching valve 31, and the air regulator 40,
31a and the operating handle 40a protrude.
Reference numeral 47 designates an injection box having a glass window 47a for visually confirming the injection state of the fuel injected from the injection valve 1 attached to the side of the gantry main body 45, and the injection box 47 to be tested by a fuel valve injection test device. Valve 1
is supported in an upright state above the pressure case 47 with the nozzle 3 located at the tip protruding into the injection box 47. Reference numeral 25 denotes a fuel tank having an oil filter 26 disposed at the lower part of the injection box 47. The fuel tank 25 stores fuel to be supplied to the injection valve 1, and at the same time, fuel is injected from the injection valve 1 into the injection box 47. It is designed to recover the fuel that is lost. Reference numeral 48 denotes an air source connection port provided at the lower part of the frame body 45 for connecting the air booster 20 and an air source 32 such as an air compressor;
Reference numeral 49 denotes a high-pressure pipe connection section provided at the top of the gantry main body 45. One end of the high-pressure hose 29 is connected to the connection section 49, and the other end is connected to the injection valve 1 supported on the top of the injection box 47. Thus, the fuel discharged from the air booster 20 is supplied to the injection valve 1.

FIG. 6 is a drawing showing details of the air booster 20 consisting of the air cylinder 23 and plunger pump 21 described above. In the figure, 50 is a cylinder of the air cylinder 23 that houses a piston 36 and a piston rod 37 therein, and 51 and 52 are cylinder heads that are attached to the openings at both ends of the cylinder 50. An intake/exhaust hole 30 and a second intake/exhaust hole 34 are provided. 53 is a guide tube whose one end is fitted into the cylinder head 51; 54 is a guide tube 53;
The base block is fitted with the other end of the base block 54 and the guide tube 53.
is fixed by a stud bolt 55 whose tip end is screwed into the cylinder head 51. 56 is a high pressure cylinder fitted into the base block 54, and the plunger 22 connected to the piston rod 37 via a coupling 57 is inserted into the high pressure cylinder 56. Reference numeral 58 denotes a headblock fitted to the tip of the high-pressure cylinder 56. The headblock 58 is provided with a fuel inlet 24 and a discharge hole 27, and has a fuel inlet 24 and a discharge hole 27 inside to prevent backflow of fuel. Check valve 59, 60
is stored. 61 is a locking plate onto which a head bolt 62 is threaded, and 63 is a head bolt 6.
A lock nut 64 for fixing the high pressure cylinder 56 and the head block 58 is a connecting bolt that is inserted through the locking plate 61. There is. By reciprocating the piston 36 of the air cylinder 23 and reciprocating the plunger 22 within the high-pressure cylinder 56, fuel is sucked in and discharged.

7 and 8 are drawings showing details of the high pressure switching valve 28 interposed between the air booster 20 and the injection valve 1. FIG. In the figure, 65 is the main body of the high-pressure switching valve 28, 66 is a hard ball that is in contact with the valve seat 67 provided in the main body 65, and 68 is a supporter for pressing the hard ball 66 against the valve seat by the elastic force of the spring 69. ,
70 is a spring holder for storing the spring 69 in the main body 65. Reference numeral 71 denotes a push bar screwed into the main body 65 so that its tip comes into contact with the hard ball 66. The push bar 71 is rotated by a predetermined angle by a handle 76, which will be described later, and the push bar 71 is slid to the right in the figure. By doing so, the hard ball 66 is moved to the right in the figure against the elastic force of the spring 69, and the valve is opened. 72 is an inlet hole provided in the main body 65; 73
is an outflow hole, 74 is a branch hole branched from the inflow hole 72, the inflow hole 72 is connected to the discharge port 27 of the air booster 20, and the outflow hole 73 is connected to the high pressure pipe connection part 49.
Furthermore, the branch holes 74 are respectively connected to the high-pressure pressure gauges 44. 75 is a handle base having a handle 76 for rotating the push bar 71 by a predetermined angle; 75a is a screw hole provided in the center of the handle base 75 into which the push bar 71 is screwed; The elastically supported lock pieces 79 and 80 are positioning holes that fit into the lock piece 77 provided on the surface of the main body 65 facing the handle base 75. The push bar 71 is rotated by a predetermined angle using the push bar 71 to open and close the valve.
By fitting into the handle 80, the handle 76 is prevented from floating when the valve is opened and closed. 81 is a lock plate for fixing the handle base 75 screwed to the pusher bar 71 on the pusher bar 71;
2 is a bolt for connecting the lock plate 81 and the handle base 75, and 83 is a stopper installed on the main body 65 to prevent the handle base 75 having the handle 76 from rotating beyond a predetermined angle.

In addition, to attach the handle base 75 to the push bar 71, screw the push bar 71 into the main body 65.
With the tip of the pusher bar 71 lightly touching the hard ball 66, the handle base 7 is attached to the outer periphery of the pusher bar 71.
5. When the lock piece 77 attached to the handle base 75 reaches the position where it fits into the positioning hole 79 corresponding to the closed position, the lock plate 81 is screwed onto the push bar 71, and the handle base 75 and the lock plate 81 are bolted together. 82, the handle base 75 is fixed on the push bar 71.

In the above configuration, in order to test the injection valve 1 using the fuel valve injection test device according to the present invention,
The injection valve 1 is set on the upper part of the injection box 47, the nozzle 3 at the tip of the injection valve 1 is made to protrude into the injection box 47, and the injection valve 1 and the high pressure pipe connection part 49 provided at the upper part of the mount body 45 are connected with a high pressure hose. Connected by 29. Next, close the high pressure switching valve 28 and switch the injection switching valve 31 to the second
Air from the air source 32 is sent to the injection switching valve 31 in the state shown in the figure. Then, air flows into the air cylinder 23 from the second intake/exhaust hole 34 of the air cylinder 23 through the injection switching valve 31, causing the piston 36 to slide to the right in FIG. Therefore, the plunger 22 of the plunger pump 21 connected to the piston 36 also slides to the right in FIG.
The fuel stored inside is sucked in. When the piston 36 reaches the right end, the injection switching valve 31 is switched to the second
Switching in the opposite direction to that shown in the figure, air is supplied into the air cylinder 23 from the first intake/exhaust hole 30 of the air cylinder 23, and the piston 36 is moved to the left in FIG. Then, the plunger 22 connected to the piston 36 also moves to the left in FIG. 2, and the fuel sucked into the high pressure cylinder 56 of the plunger pump 21 is discharged from the discharge hole 27. At this time, since the high pressure switching valve 28 interposed between the discharge hole 27 of the plunger pump 21 and the injection valve 1 is closed, the fuel is pressurized. Then, while watching the display on the high-pressure pressure gauge 44, when the pressure reaches a predetermined value, the high-pressure switching valve 28 is opened and the injection valve 1 is tested by supplying fuel to the injection valve 1 at high speed and high pressure.

When testing the injection valve 1 using the above method, first, fuel is supplied to the injection valve 1 at a pressure of 100 kg/cm ² and a leakage test from each part of the injection valve 1 is performed. Next, fuel is supplied to the injection valve 1 at a pressure of 330 kg/cm ² that opens the valve, and a valve opening/closing test of the injection valve 1 is performed.
Finally, 600Kg/cm ² is close to the pressure applied to the injection valve 1 when the diesel engine is equipped with the injection valve 1.
Fuel is supplied to the injection valve 1 at a pressure of 1, and the state of fuel injection from the injection valve 1 is tested.

E. Effects of the Invention As described above, fuel is supplied to the injection valve by an air booster consisting of an air cylinder and a plunger pump, and a high-pressure switching valve is interposed between the discharge hole of the plunger pump and the injection valve, and the plunger When the pressure of the fuel discharged from the discharge hole of the pump reaches a predetermined value, the high pressure switching valve is opened to supply fuel to the injection valve, thereby making it possible to supply fuel to the injection valve at high pressure and at high speed. Therefore, it becomes possible to accurately and reliably test injection valves that inject fuel at higher pressure and higher speed than before as an energy saving measure. In addition, high-pressure switching valves that open and close the valve when high pressure is applied rotate and slide a push bar screwed onto the main body, so the valve can be opened and closed even when high pressure is applied. It can be done easily and reliably.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing one example of an injection valve, Fig. 2 is a system diagram of a fuel valve injection test device according to the present invention, Fig. 3 is a front view of the fuel valve injection test device, and Fig. 4 is a side view. , FIG. 5 is a plan view. FIG. 6 is a partial cross-sectional view of the air booster, FIG. 7 is a front view of the high-pressure switching valve, and FIG. 8 is a cross-sectional view taken along the line shown in FIG. 7. 1...Injection valve, 20...Air booster, 21
... Plunger pump, 23 ... Air cylinder, 25 ... Fuel tank, 28 ... High pressure switching valve,
31...Injection switching valve, 32...Air source.

Claims (1)

[Claims] 1. An air booster consisting of a plunger pump that supplies fuel at a predetermined pressure to an injection valve, an air cylinder for driving the plunger pump, and an injection switching valve for switching the supply direction of air supplied to the air cylinder. , an air source for supplying air to the air cylinder via the injection switching valve; a fuel tank for storing fuel supplied to the injection valve by the plunger pump; a discharge hole of the plunger pump and the injection valve; 1. A fuel valve injection test device comprising: a high-pressure switching valve interposed between the fuel valve and the high-pressure switching valve;