Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, and provide a kind of split type electronically controlled unit pump for diesel engine, it is reasonable in design, can control injection timing and fuel injection quantity flexibly, and force feed parts and Injection Control isolation of components.
Technological scheme according to the utility model provides: for the split type electronically controlled unit pump of diesel engine, it is characterized in that: comprise electromagnet spring, electromagnet, armature, nut, control spool, dividing plate, piston spring, collar, damping spring, control valve seat, the pump housing and plunger; Compress with nut to ensure that junction plane seals in the cavity that described control valve seat and dividing plate are contained in pump housing top; Described control spool is arranged in control valve seat, controls spool and control valve seat and to partner control valve couple; Described control valve seat endoporus lower end is provided with sealed seat surface, and described control spool lower end is provided with sealing station terrace, when control spool is raised up to upper extreme position, and sealed seat surface and sealing station terrace gluing, sealing; Described armature is arranged on above control valve seat, and armature is arranged on and controls spool upper end and block with collar spacing, and arrange damping spring between armature and control valve seat, armature is close on collar by damping spring; Described electromagnet is arranged on above armature, and electromagnet is arranged in the inner chamber of pump housing top, and the electromagnet spring in electromagnet is connected with control spool upper end; Described pump housing side is provided with filler opening, and filler opening installs fuel inlet fitting, and pump housing opposite side is provided with oil spout joint, is provided with nozzle opening in oil spout joint; Described dividing plate is arranged under control valve seat, and the space that described dividing plate, control valve seat and control spool surround is as control chamber; Described plunger is arranged on below dividing plate, and plunger is assemblied in the axial plunger mounting hole on the pump housing, and plunger and the pump housing partner plunger coupled parts; The space that described dividing plate, the pump housing and plunger surround is as plunger cavity; Described control valve seat is provided with the first valve seat internal oil channel and the second valve seat internal oil channel; Described first valve seat internal oil channel upper end passes to described control chamber, and the first valve seat internal oil channel lower end passes to control valve seat bottom surface; Described second valve seat internal oil channel upper end passes to control valve seat end face, and the second valve seat internal oil channel lower end passes to control valve seat bottom surface; Described dividing plate is provided with the first dividing plate internal oil channel and second partition internal oil channel; Described first oil input channel of dividing plate internal oil channel one end on the pump housing is communicated with filler opening, and the first dividing plate internal oil channel the other end passes to described control chamber; Described second partition internal oil channel upper end aligns with described first valve seat internal oil channel lower end and is communicated with, and second partition internal oil channel lower end is communicated with described plunger cavity with nozzle opening is inner simultaneously; Described tappet body component is arranged on plunger lower end, is provided with piston spring between tappet body component and the pump housing; Described tappet body component is used for coordinating with diesel engine cam, is the straight line motion up and down of tappet body component and plunger by the convert rotational motion of cam.
As further improvement of the utility model, in the described pump housing, cavity wall is provided with internal thread, and described electromagnet is by being with externally threaded nut compressing in pump housing inner chamber.
As further improvement of the utility model, described electromagnet is contained in the inner chamber of pump housing top, is provided with the detachable adjustment packing ring changed between the support level bottom electromagnet and on inner chamber.
As further improvement of the utility model, the position that described dividing plate top contacts with control spool is provided with shrinkage pool, and shrinkage pool is built with the detachable adjustment block changed.
As further improvement of the utility model, described control center spool is provided with axially through oilhole, and described control chamber is communicated with by the space of the through oilhole of described axis with electromagnet spring place; Described dividing plate is also provided with the 3rd dividing plate internal oil channel, described 3rd dividing plate internal oil channel one end is communicated with described first dividing plate internal oil channel, and the 3rd dividing plate internal oil channel the other end passes to dividing plate end face center.
As further improvement of the utility model, described tappet body component is assemblied in guide way, tappet body component comprises guide finger, tappet body, roller base and roller, described tappet body is contained in the pilot hole of guide way, described roller base to be contained in tappet body and to fix with guide finger, and guide finger activity is embedded in the guiding groove on guide way; Described roller is arranged on bottom roller base, and roller coordinates with cam contact; Described plunger lower end is stretched in tappet body and the clamp be installed in tappet body blocks, and described piston spring lower end is pressed on described clamp, and roller base is withstood in plunger lower end.
compared with prior art, tool has the following advantages the utility model:the utility model is reasonable in design, can control injection timing and fuel injection quantity flexibly, and force feed parts and Injection Control isolation of components.
Accompanying drawing explanation
Fig. 1 is the structure sectional view of the utility model embodiment electronically controlled unit pump.
Fig. 2 is the structure enlarged diagram at control chamber position in Fig. 1.
Fig. 3 is the equilibrium principle schematic diagram under control valve couple closed condition.
Description of reference numerals: 1-electromagnet spring, 2-electromagnet, 3-armature, 4-nut, 5-controls spool, 5a-sealing station terrace, 5b-is through oilhole axially, 6-control chamber, 7-dividing plate, oilhole in 7a-first dividing plate, oilhole in 7b-second partition, oilhole in 7c-the 3rd dividing plate, 8-control chamber, 9-piston spring, 10-collar, 11-damping spring, 12-adjusts packing ring, 13-control valve seat, 13a-sealed seat surface, 13b-first valve seat internal oil channel, 13c-second valve seat internal oil channel, 14-adjustment block, the 15-pump housing, 15a-filler opening, 15b-oil input channel, 15c-nozzle opening, 16-plunger, 17-cam, 18-guide finger, 19-tappet body, 20-roller base, 21-roller, 22-guide way, 22a-guiding groove, 23-clamp, 24-nut.
Embodiment
Below in conjunction with concrete drawings and Examples, the utility model is described in further detail.
As shown in the figure: the split type electronically controlled unit pump for diesel engine in embodiment is primarily of the composition such as electromagnet spring 1, electromagnet 2, armature 3, nut 4, control spool 5, dividing plate 7, piston spring 9, collar 10, damping spring 11, adjustment packing ring 12, control valve seat 13, adjustment block 14, the pump housing 15, plunger 16, guide finger 18, tappet body 19, roller base 20, roller 21 and clamp 23.
As shown in Figure 1, described control valve seat 13 and dividing plate 7 be contained in the pump housing 15 top cavity in and compress to ensure that junction plane seals with nut 4; Described control spool 5 is arranged in control valve seat 13, controls spool 5 and control valve seat 13 and to partner control valve couple; Described control valve seat 13 endoporus lower end is provided with sealed seat surface 13a, and described control spool 5 lower end is provided with sealing station terrace 5a, when control spool 5 is raised up to upper extreme position, and sealed seat surface 13a and sealing station terrace 5a gluing, sealing; Described armature 3 is arranged on above control valve seat 13, and armature 3 is arranged on and controls spool 5 upper end and block spacing with collar 10, and arrange damping spring 11 between armature 3 and control valve seat 13, armature 3 is close on collar 10 by damping spring 11; Described electromagnet 2 is arranged on above armature 3, and electromagnet 2 is arranged in the inner chamber of the pump housing 15 top, and the electromagnet spring 1 in electromagnet 2 is connected with control spool 5 upper end; The described pump housing 15 side is provided with filler opening 15a, and filler opening 15a installs fuel inlet fitting, and the pump housing 15 opposite side is provided with oil spout joint, is provided with nozzle opening 15c in oil spout joint; Described dividing plate 7 is arranged under control valve seat 13, and the space that described dividing plate 7, control valve seat 13 and control spool 5 surround is as control chamber 6; Described plunger 16 is arranged on below dividing plate 7, and plunger 16 is assemblied in the axial plunger mounting hole on the pump housing 15, and plunger 16 and the pump housing 15 partner plunger coupled parts; The space that described dividing plate 7, the pump housing 15 and plunger 16 surround is as plunger cavity 8; Described control valve seat 13 is provided with the first valve seat internal oil channel 13b and the second valve seat internal oil channel 13c; Described first valve seat internal oil channel 13b upper end passes to described control chamber 6, first valve seat internal oil channel 13b lower end and passes to control valve seat 13 bottom surface; Described second valve seat internal oil channel 13c upper end passes to control valve seat 13 end face, and the second valve seat internal oil channel 13c lower end passes to control valve seat 13 bottom surface; Described dividing plate 7 is provided with the first dividing plate internal oil channel 7a and second partition internal oil channel 7b; The described first oil input channel 15b of dividing plate internal oil channel 7a one end on the pump housing 15 is communicated with filler opening 15a, and the first dividing plate internal oil channel 7a the other end passes to described control chamber 6; Described second partition internal oil channel 7b upper end aligns with described first valve seat internal oil channel 13b lower end and is communicated with, and second partition internal oil channel 7b lower end is communicated with described plunger cavity 8 with nozzle opening 15c is inner simultaneously; Described tappet body component is arranged on plunger 16 lower end, is provided with piston spring 9 between tappet body component and the pump housing 15; Described tappet body component is used for coordinating with cam 17, is the straight line motion up and down of tappet body component and plunger 16 by the convert rotational motion of cam 17.
As shown in Figure 1, in the utility model embodiment, in the described pump housing 15, cavity wall is provided with internal thread, and described electromagnet is pressed in the pump housing 15 inner chamber by the externally threaded nut 24 of band.Bottom described electromagnet 2 and be provided with the adjustment packing ring 12 detachably changed between the support level on inner chamber, adjust packing ring 12 can adjust gap between electromagnet 2 and armature 3 by changing.Described dividing plate 7 top with control the position that contact of spool 5 and be provided with shrinkage pool, shrinkage pool, can the stroke of regulable control spool 5 by the adjustment block 14 changing different-thickness built with the detachable adjustment block 14 changed, thus the fuel injection quantity of control monoblock pump.
As shown in Figure 1, in the utility model embodiment, described control spool 5 center is provided with axially through oilhole 5b, and described control chamber 6 is communicated with the space at electromagnet spring 1 place by the through oilhole 5b of described axis; Described dividing plate 7 is also provided with the 3rd dividing plate internal oil channel 7c, described 3rd dividing plate internal oil channel 7c one end is communicated with described first dividing plate internal oil channel 7a, and the 3rd dividing plate internal oil channel 7c the other end passes to dividing plate 7 end face center.Can ensure that suffered hydraulic coupling is upwards identical with downward hydraulic coupling like this, control the fluid pressure balance suffered by spool 5.In addition, under control valve couple is in the closed condition shown in Fig. 3, the sealed seat surface 13a of control valve seat 13 seals with the sealing station terrace 5a controlling spool 5 and contacts, and the hydraulic coupling upwards controlled suffered by spool 5 is F1, and downward hydraulic coupling is F2; Because in now control chamber 6, the pressure of fuel oil is identical, the area of contour of upper and lower pressure-bearing part is also identical, so F1 equals F2, namely controls spool 5 lower suffered fluid pressure balance in off position.
As shown in Figure 1, in the utility model embodiment, described tappet body component is assemblied in guide way 22, tappet body component forms primarily of guide finger 18, tappet body 19, roller base 20 and roller 21, described tappet body 19 is contained in the pilot hole of guide way 22, described roller base 20 is contained in tappet body 19 and also fixes with guide finger 18, and guide finger 18 activity is embedded in the guiding groove 22a on guide way 22; Described roller 21 is arranged on bottom roller base 20, and roller 21 contacts with cam 17 and coordinates; Described plunger 16 lower end is stretched in tappet body 19 and the clamp 23 be installed in tappet body 19 blocks, and described piston spring 9 lower end is pressed on described clamp 23, and roller base 20 is withstood in plunger 16 lower end.
In above-mentioned tappet body component, tappet body 19 and roller base 20 are transition fit, can avoid the stressed excessive deformation of roller base 20 like this, cause the wearing and tearing of roller 21 and roller base 20.Guide finger 18 and roller base 20 interference fit, tappet body 19 and roller base 20 are connected together through the hole on tappet body 19, such tappet body component is just combined into an entirety simultaneously, convenient transport and installation.Guide finger 18 moves up and down along guiding groove 22a, limits roller base 20 and rotates, thus ensure that roller 21 and cam 17 good contact, avoids damaging; Simultaneously because tappet body 19 is longer, ensure that the guiding of tappet body component in guide way 22, improve the life-span of tappet body component.
Working procedure of the present utility model and working principle as follows:
Oil spout joint connects oil sprayer, and fuel inlet fitting connects fuel tank.
One, during cam 17 backhaul:
Tappet body component and plunger 16 are at the moved downward of piston spring 9, and the plunger cavity 8 of plunger 16 head produces negative pressure.Electromagnet 2 no electric circuit, control spool 5 and be in lower limit position under the effect of electromagnet spring 1, the sealed seat surface 13a of control valve seat 13 does not contact with between the sealing station terrace 5a controlling spool 5, now plunger cavity 8 is communicated with control chamber 6 with the first valve seat internal oil channel 13b by second partition internal oil channel 7b, filler opening 15a is communicated with control chamber 6 with the first dividing plate internal oil channel 7a by oil input channel 15b, and the oil circuit namely between plunger cavity 8 and filler opening 15a is in open mode; Fuel oil is inhaled into plunger cavity 8 by oil input channel 15b, the first dividing plate internal oil channel 7a, control chamber 6, first valve seat internal oil channel 13b and second partition internal oil channel 7b successively under suction function.
Two, during cam 17 lift:
Tappet body component promotes plunger 16 and moves upward, the fuel oil in plunger 16 compression plunger chamber 8.
When electromagnet 2 no electric circuit, control spool 5 and be in lower limit position under the effect of electromagnet spring 1, the sealed seat surface 13a of control valve seat 13 does not contact with between the sealing station terrace 5a controlling spool 5, oil circuit now between plunger cavity 8 and filler opening 15a is in on-state, when plunger 16 is up, fuel oil in plunger cavity 8 flows through second partition internal oil channel 7b successively, first valve seat internal oil channel 13b, control chamber 6, first dividing plate internal oil channel 7a and oil input channel 15b is back in fuel tank, in plunger cavity 8, the pressure of fuel oil is no more than the cracking pressure of oil sprayer, oil sprayer can not be opened.
When electromagnet 2 is energized, armature 3 is upwards inhaled by electromagnet 2, the active force that armature 3 overcomes electromagnet spring 1 is up, brake control valve core 5 is with to move upward by collar 10 when electromagnet 2 is up, to control valve seat 13 sealed seat surface 13a with control the sealing station terrace 5a of spool 5 fit contact time, control spool 5 stop motion, oil circuit between plunger cavity 8 and filler opening 15a is in off state, when plunger 16 is up, fuel oil in plunger cavity 8 is compressed, when in plunger cavity 8, the pressure of fuel oil exceedes the cracking pressure of oil sprayer, high pressure fuel is sprayed in the cylinder of diesel engine by oil sprayer.
When electromagnet 2 again power-off time, oil circuit between plunger cavity 8 and filler opening 15a is in on-state, fuel oil in plunger cavity 8 flows through second partition internal oil channel 7b successively, the first valve seat internal oil channel 13b, control chamber 6, first dividing plate internal oil channel 7a and oil input channel 15b are back in fuel tank, pressure in plunger cavity 8 is released, and oil sprayer stops oil spout.
In the utility model, the energising moment of electromagnet 2 determines the initial point of oil spout, can change injection timing by the energising moment changing electromagnet 2.The endurance of electromagnet 2 energising determines the endurance of oil spout, also just determines fuel injection quantity, just can control fuel injection quantity by the length changing electromagnet 2 power on duration.So just can control injection timing and fuel injection quantity flexibly, make diesel engine reach reasonable performance.