SU1281727A1 - Nozzle atomizer for diesel engine - Google Patents

Description

15

11281727

FIELD OF THE INVENTION The invention relates to engine resilience for use in diesel engine furnace equipment.

The aim of the invention is to increase the reliability and durability of the carrier,

Figure 1 shows the dispenser, the rodent section of figure 2 - node I and figure 1; on fig.Z - node II on ig.1.fO

The atomizer contains a needle valve 3 mounted in a cylindrical guide surface 1 of body 2 with a guide 4, a carrier 5 and a locking 6 parts, ending with a stop pin 7. The guide part 4 of valve 3 is made of a composite rod 8 and a guide sleeve 9 having central 10 and peripheral 11 and 12 sites. The peripheral portions 11 and 12 of the outer surface of the guides of the sleeve 9 are made in the form of truncated cones located on large bases in the direction toward the central section 10 of the guide sleeve 9.

The diameter of the large bases of the truncated cones differs from the diameter of the smaller bases by twice the gap between the guide surfaces of the housing 2 and the valve 3, and the angle between the forming truncated cones and the cylindrical surface of the guide part 4 of the housing 2 is made within the boundary friction angle tg B - f pp where

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up to ka ka ka kli teg vv for now for ma n

and

. „- coefficient of boundary friction. The bearing part 5 of the valve 3 is provided with recesses 13 and 14 located in mutually perpendicular planes, with the rod 8 in the bearing part 5 of the valve 3 and in the gap between the outer surface of the rod 8 and the inner surface of the guide sleeve 9 in the guide part 4 of the valve 3 The testotransporter 15 is placed, made of a material with high thermal conductivity. The rod 8 has the same diameters in the guide 4 and the carrier 5 parts of the valve 3,

The driver works as follows.

At the initial moment, the fuel enters the cavity, 1 of housing 2, and fills it. As the pressure in cavity 1 increases, fuel penetrates into the conical gap formed between

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right and right

grave

50 to no ve

5 times less than

45

the guide body 2 and the peripheral section 11 of the outer surface of the guide sleeve 9 of the needle valve 3. The peripheral section 11 of the guide sleeve 9 is made in the form of a truncated cone, which has a large base in the direction of the center section 10.

As soon as the pressure in the cavity 1 reaches a value corresponding to the start of fuel injection, a hydrodynamic wedge is formed in the conical gap between the guide casing 2 and the peripheral section 12 of the bush 9; centering valve 3 relative to the guide casing 2 from below. Needle, valve 3 rises. At the same time, in the upper conical gap formed between the guide body 2 and the opposite periphery section 11 of the sleeve 9, performed as a truncated cone, a hydrodynamic wedge is also created due to the significant lifting speed of the valve 3, centering the 1st valve 3 relative to the guide housing 2 on top.

The angle between the shape; the truncated cones on the peripheral sections 11 and 12 and the cylindrical guide surface of the housing 2 are selected within the limits of the friction friction angle tg | i - ffp, the choice of the angle, 6 is due to

when the angle is less than the angle of the friction, the height of each truncated cone cone significantly increases. This reduces the length of the sealing part of the valve 3, increases the hydraulic loss, decreases the stability of the supplied fuel and deteriorates the engine efficiency,

When the angle is greater than the boundary friction angle, the height of the truncated cones and hydraulic wedges formed between the lateral forming truncated cones and the guide

housing 2 is not sufficient to create the necessary centering force, due to -qsro the formation of local contacts of rubbing surfaces is not excluded, which inevitably leads to

tearing of the lubricating film, scuffing and, consequently, increased wear of the sprays — gl. The diameter of the smaller bases of the truncated caucas is different from the diameter of the larger bases.

3

i.e. from the diameter of the guide sleeve 9 on the central portion 10 on. double the size of the gap between the guiding surfaces of the housing 2 and the valve 3. The magnitude of the gap is such that on each of its surfaces there is an adhesive lubricant film of fuel, the thickness of which is close to that of the side gap and, therefore, the wedge-shaped gap filled with elastic, then eat it in a.

Changing the specified ratio of diameters both upwards and downwards decreases the efficiency of the sprayer. Ta increasing the diameter of the smaller bases of the truncated cones causes a decrease in hydrodynamic force due to the insufficient length of the hydrodynamic wedge, as a result of which the lubricating film may rupture and form By wearing a precision pair of sprayer. A decrease in the diameter of the smaller bases of the truncated cones and an increase in the gap does not cause an increase in hydrodynamic force, since the free layer of fuel moves together with the surfaces of the truncated cones without a noticeable increase in pressure in the thick layer. At the same time, however, the height of the cones increases, as a result of which the sealing length of the guide sleeve 9 decreases and the sprayability of the spray gun decreases.

During further operation of the spray needle valve 3 by the force of a compressed spring (not shown) acting on the thrust pin 7, B, the moment the fuel supply stops moving at high speed in the direction of the stop cone of the housing 2 until the valve part 6 is adjacent to it 3. At the same time, the implementation on the bearing part 5 of the valve 3 of the recesses 13 and 14, located in mutually perpendicular planes, ensures a lateral flexibility

a conical gap between the guide housing 2 and the surface of the peripheral portion 12 of the guide sleeve

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-5 0 5

five

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9 provides the centering of the valve 3, thereby providing a more reliable coupling of the valve and body closure surfaces.

Intensive testing of the locking surfaces is provided by placing along the entire length of the guide 4 and the carrier 5 parts of the valve 3 on the rod 8 of the heat dissipating sleeve 15, which reduces the heat demand of the locking surfaces of the sprayer, increases their wear resistance, durability and reduces coking.

Thus, the proposed sprayer provides increased reliability and durability.

Claims (1)

Invention Formula An injector nozzle for a diesel engine that contains a needle valve installed in the cylindrical guide surface of the housing with a guide, carrier and shut-off parts and a heat removing sleeve, the valve bearing part being provided with grooves located in mutually perpendicular planes .; the part is made up of a rod and a guide bush, the peripheral portions of the outer surface of which are made in the form of truncated cones, which are located with large bases towards the central portion of the guide bush, and the heat sink 0 5 0 The spigot is placed in the gap between the inner surface of the guide bushing and the outer surface of the rod, whose diameter in the valve guide is equal to the diameter of the bearing part, which, in order to increase reliability and durability, the angle between the truncated cones and the cylindrical The body guiding surface is made within the limits of the angle of the friction friction, and the difference is I, and the diameters of the larger and smaller bases of the truncated cones are made equal to twice the gap size Waiting for the guiding surfaces of the housing and the valve. eleven fPu2.1 ten .Z Editor A. Shandor Compiled by, Pavlyukov Tehred I.HonoBifH Corrector M. Maximshnnets Fi.2.5