JPS6090982A - Fuel valve injection testing device - Google Patents

Abstract

PURPOSE:To permit to cope with the test of an injection valve whose pressure and speed are increased by a method wherein a high-pressure changeover valve is provided between the delivery port of a plunger pump and the injection valve to supply fuel from the changeover valve when the pressure of the fuel from the delivery port has arrived at a predetermined value. CONSTITUTION:When the injection valve 1 is connected to the connecting section of a high-pressure pipe, the high-pressure changeover valve 28 is closed, an injection switching valve 31 is moved to the left and air is sent to the changeover valve 31, the air flows into an air cylinder 23 and moves a piston 36 to the right. Accordingly, a plunger 22 is slid to the right,the fuel is sucked into a high-pressure cylinder 56 and the piston arrives at the right end, then, the changeover valve is switched to the right to supply the air into the cylinder 23 and the piston is moved to the left. Then, the plunger 22 is also moved to the left and the fuel in the high-pressure cylinder 56 is discharged out of the delivery port 27. The high-pressure changeover valve 28 is being closed, therefore, the fuel is pressurized and when the pressure has arrived at a predetermined value, the changeover valve 28 is opened and the fuel is supplied to the injection valve 1 under high speed and pressure, whereby the test of the injection valve 1 may be effected.

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. Conventional technology: For ships equipped with large diesel engines of Burmeister & Wain type (hereinafter referred to as B&W type),
Usually, a diesel engine is equipped with a fuel valve injection test device for testing and adjusting the operating condition of the spare injection valves installed in the diesel engine. During M-sea, maintenance and inspections are carried out using a fuel valve injection testing device to ensure that the 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 drawing 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 the valve body, (3) is the nozzle fixed to the tip of the valve body (2) via a bag nand (4), and (5) is the valve body (2) and the nozzle (3). Hole (2a) (3a
) is a needle that is slidably housed inside the needle. 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). ,spring(
6), the tip of the twenty-one dollar (5) is in pressure contact with the valve seat (3b).

The pressing force of the spring (6) can be adjusted using a bolt (7) threaded onto the valve body (2). (8) is a fuel supply hole for supplying fuel into the pressure reservoir (3c) provided in the nozzle (3), and (9) is a fuel supply hole (8).
The circulation valve (9) is designed to open with a weak pressure of about 30 kg/era.

In the above configuration, in order to inject fuel from the tip of the nozzle (3) of the injection valve (1), the fuel is force-fed from the fuel pump (not shown) to the circulation valve (9). By applying pressure to
When the circulation valve (9) is opened, fuel is pumped into the pressure reservoir (3c) through the fuel supply hole (8) communicating with the circulation valve (9). At this time, the air in the oil supply hole (8) and pressure reservoir (3c) flows through the hole (3a) (2a) provided in the nozzle (3) and valve body (2), and the hole (
3a) It is discharged to the outside through a minute gap formed between the needle (5) inserted in (2a) and the drain discharge hole (10) provided in the valve body (2). 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)
Fuel is injected from.

By the way, BAW type diesel engines equipped with the above-mentioned injection valve (1) have recently been implemented with energy saving measures, and along with this, the injection valve (1)
) is also being injected at high pressure and high speed.

Therefore, the pressure applied to the needle (5) by the spring (6) of the injection valve (1) is also conventionally 250 kg/al.
It used to be about 350 kg/cJ, but it has been increased to about 350 kg/cJ.

However, as the pressure and speed of the injection valve (1) increases, conventional fuel valve injection testing equipment
There is a problem in that it is not possible to apply sufficient pressure to 1), making it impossible to perform accurate tests.

1. Purpose of the Invention It is an object to provide a fuel valve injection test device which can sufficiently cope with high pressure and high speed injection valves as an energy saving measure.

C. A fuel valve injection test device with a configuration of 8 lights is provided with an air booster consisting of a plunger pump that supplies fuel to the injection valve at a predetermined pressure, an air cylinder for driving the plunger pump, and the air cylinder. an injection switching valve for switching the supply direction of air; an air source for supplying air to the air cylinder via the injection switching valve;
The fuel tank includes a fuel tank that stores 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.

2. Embodiment FIG. 2 is a system diagram showing the circuit configuration of a fuel valve injection test device according to the present invention. In the figure, (20) is an air booster consisting of 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). It is. The suction hole (24) provided in the plunger pump (21) of the air booster (23) is connected to the injection valve (1).
) is connected via an oil filter (26) to a fuel tank (25) containing fuel to be pumped to
It is designed to be connected to the injection valve (1) through. Further, the first intake/exhaust hole (30) provided in the air cylinder (23) of the air booster (2o) is connected to the air source (32) or the first muffler (33) via the injection switching valve (31). , and the second intake/exhaust hole (34) is connected to the injection switching valve (3
1) to the air source (32) or the second muffler (
35). When the injection switching valve (31) is located on the left side in the figure, 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). ), the piston (36) of the air cylinder (23) slides to the right in the figure, and the plunger (22) of the plunger pump (21) is connected to the piston rod (37) of the air cylinder (23). Slide it in the suction direction (to the right in the figure). Further, when the injection switching valve (31) is located on the right side in the figure, the first intake/exhaust hole (30) is connected to the air source (32), and the second intake/exhaust hole (34) is connected to the second muffler (35).
), the cylinder (36) of the air cylinder (23) slides to the left in the figure, and the plunger (22) of the plunger pump (21) is connected to the piston rod (37) of the air cylinder (23). Discharge direction (
(to the left in the figure). Note that the first muffler (33) is smaller than the second muffler (35) and has greater exhaust resistance than the second muffler (35). ) and the injection switching valve (31) are interposed with a throttle slit (38). Therefore, when switching the injection switching valve (31) to reciprocate the piston (36) of the air cylinder (23), when the piston (36) slides the plunger (22) of the plunger pump (21) in the discharge direction, the plunger ( 22) moves at high speed and the piston (36) slides the plunger (22) in the suction direction.
It moves at a low speed due to the exhaust resistance of the first muffler (33) and the throttle slit (38), and at the same time ensures that the plunger pump (22) sucks the fuel and at the same time discharges the sucked fuel at a high speed. I try to do it. Further, the air booster (20) is connected to an air source (3).
2) Air pressure from 7 kg/co! The dimensions of each member were determined so as to generate a maximum pressure of 700 kg/cJ (. (39) (40) (41)
42) is an air filter, an air regulator, which is interposed between the air source (32) and the injection switching valve (31).
It is a safety valve and an oiler, and the oiler (42) supplies lubricating oil to the air booster (20) using an air circuit. In addition, (43) in the figure is an air pressure needle that measures the pressure of the air supplied from the air source, (
44) is a high pressure needle 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), there is an air booster (2
0), high pressure switching valve (2B), injection switching valve (31)
, air filter (39), air regulator (4)
0), a safety valve (41) and an oiler (42) are built in, and the front panel (46) has an air pressure gauge (
43) and high pressure pressure gauge (44) are installed,
Operation lever (2B) for operating the high pressure switching valve (2B), injection switching valve (31) and air regulator (40)
8a) (31a) and operating handle (40a)
stands out. (47) is 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); The injection valve (1) to be tested by the test device is installed in the pressure case (47) with the nozzle (3) located at the tip protruding into the injection box (47).
It is supported in an upright position above the (25) is a fuel tank having an oil filter (26) placed at the bottom of the injection box (47), and the fuel tank (25) is
The fuel to be supplied to the injection valve (1) is stored and, at the same time, the fuel injected from the injection valve (1) into the injection box (47) is collected. (48) is an air source connection port provided at the bottom of the pedestal body (45) for connecting the air booster (20) and an air source (32) such as an air compressor; (49) is the pedestal body (45); 45), one end of the high pressure hose (29) is connected to the connection part (49), and the other end is connected to the injection valve (1) supported on the top of the injection box (47). ), 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 above-mentioned air cylinder (23) and plunger pump (21). In the figure (50) is a piston (
36) and the piston rod (37) of the air cylinder (23), (51) and (52) are cylinder heads attached to both end openings of the cylinder (50). ) the first intake/exhaust hole (30) and second intake/exhaust hole 34) described above.
is the provision. (53) has one end connected to the cylinder head (51).
), and (54) is a base block fitted with the other end of the guide tube (53), and the base block (54) and the guide tube (5
3) is fixed by a stud pole (55) whose tip is screwed into the cylinder head (51). (56
) is a high-pressure cylinder fitted to the base block (54), and a plunger (22) connected to the piston rod (37) via a compression ring (57) is inserted into the high-pressure cylinder (56). ing. (5B) is a head plotter fitted to the tip of the high pressure cylinder (56), and the head proc (5B) is provided with a fuel inlet (24) and discharge hole (27). There is also a check valve (59) inside to prevent backflow of fuel.
) (60) is stored.

(61) is a locking plate into which the head bolt (62) is threaded, (63) is a lock nut for fixing the head pole 1-(62), and (64) is a connecting bolt that is inserted through the long plate black 1). Yes, the locking plate (61) and head bolt (62) are included.
, lock nand (63) and connecting bolt (
64) fixes the high pressure cylinder (56) and head block (58). And air cylinder (23
) reciprocates the piston (36) of the high pressure cylinder (5
By reciprocating the plunger (22) within 6), fuel is sucked in and discharged.

Figures 7 and 8 show the air booster (20) and the injection valve (
1) is a drawing showing details of a high-pressure switching valve (2B) interposed between FIG. In the figure, (65) is the main body of the high-pressure switching valve (28), (66) is the hard ball that is in contact with the valve seat (67) provided in the main body (65), and (68) is the hard ball (66) that is connected to the spring ( 69) is a supporter for pressing against the valve seat by its elastic force, and (70) is a spring holder for storing the spring (69) in the main body (65). (71) has a main body (65) with its tip in contact with the hard ball (66).
) is a bushing bar screwed into the inside of the shaft.By rotating the bushing bar (7I) by a predetermined angle using a handle (76), which will be described later, and sliding the bushing bar (71) to the right in the figure, the hard ball (66) can be sprung. (69)
The valve is opened by moving it to the right in the figure against the elastic force of the valve.

(72) is an inflow hole provided in the main body (65), (73) is an outflow hole, (74) is a branch hole branched from the inflow hole (72), and the inflow hole (72) is connected to the air booster (20). The outflow hole (73) is connected to the high pressure pipe connection (4).
9) and the branch hole (74) are respectively connected to a high pressure pressure gauge (44). (75) is a handle base having a handle (76) for rotating the bush bar (71) by a predetermined angle, and (75a) is a screw hole provided in the center of the handle base (75) to screw into the bush bar (71). , (7
7) is a lock piece elastically supported on the handle base (75) via a spring (78), (79) (80
) is a positioning hole that fits with a lock piece (77) provided on the surface of the main body (65) facing the handle base (75), and the two positioning holes (79) and (80) of the handle base ( The lock piece (77) is provided in a position corresponding to the open position and the closed position when opening and closing the valve by rotating the bushing bar (71) by a predetermined angle using the lock piece (75). ) so that you can tell whether the valve is open or closed. (81) is Butshubah (
Attach the handle base (75) screwed onto the handlebar (71) to the handlebar (71).
71) A lock plate (82) is a bolt for connecting the lock plate (81) and the handle base (75), and (83) is a lock plate for fixing the handle base (75) with the handle (76). This is a striker installed upright on the main body (65) to prevent it from rotating beyond an angle.

In addition, to attach the handle base (75) to the bushing bar (71), insert the bushing bar (71) into the main body (65), and then attach the bushing bar (71) with the tip of the bushing bar (71) lightly touching the hard ball (66). A handle base (75) is screwed onto the outer periphery of the handle (71). When the lock piece (77) that has been removed from the handle base (75) comes to the position where it fits into the positioning hole (79) corresponding to the closed position, the lock plate (81) is screwed onto the button bar (71). The handle base (75) is then fixed on the bushing bar (71) by tightening the handle base (75) and the lock plate (81) with bolts (82).

In the above configuration, in order to test the injection valve (1) using the fuel valve injection test device according to the present invention, it is necessary to test the injection valve (1).
) at the top of the injection box (47), the nozzle (3) at the tip of the injection valve (1) protrudes into the injection box (47), and the injection valve (1) and the mount body (45) are installed at the top. The high-pressure pipe connection part (49) is connected to the high-pressure pipe connection part (49) by a high-pressure hose (29).

Next, close the high pressure switching valve (28), and with the injection switching valve (31) positioned on the left side in Fig. 2, air ex (32>
Air is sent to the injection switching valve (31). Then, the air passes through the injection switching valve (31) and enters the air cylinder (23).
) from the second intake/exhaust hole (34) of the air cylinder (23
) and slide the piston (36) 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. 2, and the fuel stored in the fuel tank (25) is sucked into the high-pressure cylinder (56). It will be done. When the piston (36) reaches the right end, the injection switching valve (31) is switched to the right in FIG.
Air is supplied into the air cylinder (23) from the intake/exhaust hole (30) to move the piston (36) to the left in FIG. Then, the plunger (22) connected to the piston (36) also moves to the left in Fig. 2, and the plunger pump (
The fuel sucked into the high pressure cylinder (56) of 21) is discharged from the discharge hole (27). At this time, the high pressure switching valve (2 days) interposed between the discharge hole (27) of the plunger pump (21) and the injection valve (1) is closed, so the fuel is pressurized. Then, while watching the display on the high pressure needle (44), when the pressure reaches a predetermined value, the high pressure switching valve (28) is opened and fuel is supplied to the injection valve (1) at high speed and high pressure. Do a test.

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/-, 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/cdl when the valve is opened, and a valve opening/closing test of the injection valve (1) is performed. 600 kg, which is close to the pressure applied to the injection valve (1) when the injection valve (1) is finally installed in the diesel engine.
Fuel is supplied to the injection valve (1) at a pressure of /call, and the state of fuel injection from the injection valve (1) is tested.

E6 Effects of the Invention As mentioned above, fuel is supplied to the injection valve by an air booster consisting of an air cylinder and a plunger pump,
In addition, a high pressure switching valve is interposed between the discharge hole of the plunger pump and the injection valve, and when the pressure of the fuel discharged from the discharge hole of the plunger pump reaches a predetermined value, the high pressure switching valve is opened to supply fuel to the injection valve. By supplying fuel, fuel can be supplied to the injector at high pressure and high speed. Therefore, as an energy saving measure, it becomes possible to accurately and reliably test injection valves that inject fuel at higher pressures and higher speeds than in the past. In addition, high-pressure switching valves that open and close when high pressure is applied are
Since this is done by rotating and sliding the bushing bar screwed onto the main body, the valve can be opened and closed easily and reliably even when high pressure is applied.

[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. Figure 6 is a partial sectional view of the air booster, Figure 7
The figure is a front view of the high pressure switching valve, and FIG. 8 is a sectional view taken along the line 1-1 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. Figure 1 Procedural amendment 1. Display of the case 1932 Patent No./Rizz7z No. 2 Name of the invention Fuel valve injection test device 3, Person making the amendment Relationship to the case Patent applicant Name Name Fuji Techno Kogyo Co., Ltd. 4, Agent 8550 Address Osaka 1-15-26 Edobori, Nishi-ku, Osaka-shi, Osaka Commercial Building "Yes," he corrected. Correct the phrase ``to the left in the figure'' to ``to the state shown in the figure'' in the 2θ line of page g. J, 2nd sentence, line i, correct "to the right in the figure" to "to the opposite direction from the figure." G, 1st N, 1st J line ``Opening/closing is 1'' is corrected to ``When opening/closing, the handle (7 [9 is not loose ut L''). "to the left" is corrected to "to the state shown in Figure 2".

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 switch for switching the supply direction of air supplied to the air cylinder. a valve, 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;