CN2856450Y

CN2856450Y - Cylinder cap of diesel engine

Info

Publication number: CN2856450Y
Application number: CN 200520117329
Authority: CN
Inventors: 吴杰
Original assignee: ZHONGCE POWER ELECTROMECHANICAL GROUP CO Ltd NINGBO
Current assignee: ZHONGCE POWER ELECTROMECHANICAL GROUP CO Ltd NINGBO
Priority date: 2005-12-19
Filing date: 2005-12-19
Publication date: 2007-01-10
Anticipated expiration: 2015-12-19

Abstract

A diesel engine cylinder cover has a fuel-injection pore, an air inlet valve hole, an air release valve, an inlet duct, an exhaust duct, an exhaust valve seat mounting hole, an indicator valve safe hole and a starting valve hole. The improvement of utility model is a double bottom structure with thin bottom and strong back composed of a thermal power plate and a median plate, a slope type structure in centrifugal direction formed by the thermal power plate and the large fillet smooth transition between the inner bottom and the inner circumferential wall. The utility model improves the power of diesel engine, ensures the adequate height, meets the demanded stresses, reduces fuel consumption rate, reduces the NO<SUB>x</SUB> exhaust to the environmental standard, achieves reliable structure and operation safeness, and is applicable for marine engine, marine auxiliary machinery, and power station and industry used power.

Description

Cylinder cover for diesel engine

Technical field

The utility model relates to the cylinder cover for diesel engine structure.

Background technique

Diesel engine is the force motor that the heat energy that fuel obtains in engine interior burning is changed into mechanical energy, is applicable to that marine engine, hull auxiliaries, land are with power station and other industrial power.As everyone knows, cylinder head is one of strength member of diesel engine, its effect is sealing cylinder and piston, cylinder sleeve and body constitute the combustion space, in order to control air and fuel enters cylinder, it will provide the installing space of many component, for example oil sprayer is installed, advance, outlet valve is installed, starting valve is installed, delivery valve seat is installed or the like, also have sizable heat to pass to cooling medium by cylinder head, and the effect of bearing high-temperature high-pressure fuel gas, in order to guarantee the sealing between cylinder head and the cylinder liner, cylinder head also will be subjected to very big bolt pretightening, so the design of cylinder head is directly connected to the power of diesel engine, Economy, functional reliability and servicing ease or the like, the advance of its structure will directly influence fuel consumption rate, NO _xCan discharge, use the Security of former (weight) oil, reliability of structure, operation, therefore, the appropriate design air cylinder head structure be vital.By architecture advances repeatedly, existing middling speed high-power diesel engine possesses low, the NO of fuel consumption rate basically _xDischarge low, can use characteristics such as former (weight) oil, reliable in structure, security of operation, however, also there is some defective in its general structure, thickness problem as fire deck and central diaphragm, the transition structure of diapire shape and fire deck and inner circle wall in the fire deck, or the like, make eventually the fire deck that directly contacts with high-temperature fuel gas bear high heat load and mechanical stress, fully cool off, reduce thermal stress, to bear aspect of performances such as shearing stress and radial temperature not enough in still having completely.

Summary of the invention

Goal of the invention of the present utility model all provides a kind of further raising diesel engine power, reduces fuel consumption rate, reduces NO in the defective that overcomes prior art _xDischarging, structure is more reliable, moves safer cylinder cover for diesel engine.

Goal of the invention of the present utility model realizes by following technical proposal:

A kind of cylinder cover for diesel engine, this cylinder head is provided with the fuel-injection pore of straight dress oil sprayer, two inlet valve hole and two air release valve holes are formed four valves, intake duct and air outlet flue set up both sides separately, the delivery valve seat mounting hole communicates with air outlet flue, also be provided with safe valve opening that indicator valve is installed and the starting valve hole that starting valve is installed, the cylinder head bottom has the fire deck and the central diaphragm that seal seam and forms end back of the body double layer construction, it is characterized in that the double bottom structure of the back of the body double layer construction of the described end for the strong back of the body in the thin end; Diapire is the slope shape structure that is outwards increased gradually by the center in the described fire deck.

Diapire and inner circle wall are that big fillet relaxes transition in the described fire deck.

Compared with prior art, the utility model has been made some structure to cylinder cover for diesel engine and has been improved easily, as satisfying improving constantly of diesel engine power again for the thickness that reduces fire deck, guarantee that cylinder is stamped enough height, fire deck and central diaphragm to cylinder head adopts the double bottom structure of " carry on the back by force at the thin end ", bear thermal stress and mechanical stress to satisfy, make and fully cool off with the contacted fire deck of high-temperature fuel gas and reduce thermal stress, double bottom structure can also play the guiding role to cooling water, with quick cooling fire deck temperature; The big fillet of interior diapire of the slope shape structure of diapire and fire deck and inner circle wall relaxes transition in the fire deck, the stress that radial temperature, minimizing thermal stress cause bottom all helping bearing shearing stress and reducing is concentrated, and raising diesel engine structural reliability has been played immeasurable effect.The G300 diesel engine obtains after tested: power is brought up to 2206kw from 750kw, and fuel consumption rate drops to 195g/kw.h, NO _xDischarging detects to be passed through, and meets environmental protection standard.

Description of drawings

Fig. 1 is the utility model sectional structure schematic representation (the A-A sectional view of Fig. 2).

Fig. 2 is the plan view of Fig. 1.

Fig. 3 is the B-B sectional view of Fig. 1.

Fig. 4 is the C-C revolved sectional view of Fig. 3.

Fig. 5 is the D-D sectional view of Fig. 2.

Embodiment

Below will be described in detail again the utility model embodiment by above-mentioned accompanying drawing.

Shown in Fig. 1～5, cylinder cover for diesel engine is the improvement of former cylinder head 1, blank is by iron casting, form through gold machining, keep having of original structure: the fuel-injection pore 3 that oil sprayer directly is installed, two inlet valve hole 2 and two air release valve holes 4 are formed four valves, intake duct 9 and air outlet flue 5 set up both sides separately, delivery valve seat mounting hole 6 communicates with air outlet flue, the safe valve opening 12 of valve is shown in installation, the starting valve hole 10 of starting valve is installed, and the cylinder head bottom is a fire deck 8, and the spiral hole 11 on the cylinder cap is to connect cylinder body.The design designs sealing seam 7 increased area on the fire deck 8, make the active region of cylinder head bolt pretightening force near supporting force, guarantee between body and the cylinder liner bearing position therewith sealing station align, thereby reduce harmful additional moment that the cylinder head seam exists.

Fire deck 8 is formed end back of the body double layer construction with central diaphragm 13, and be designed to the double bottom structure of " thin the end carry on the back by force ", for this reason, it is 25mm that central diaphragm is selected thickness for use, fire deck center thinnest part has only 12mm, and the double sole of " carry on the back by force at the thin end " can better be born thermal stress and mechanical stress.Interior diapire 14 to fire deck 8 is designed to the slope shape structure simultaneously, promptly outwards thicken for 5.5 ° by the thick tilt angle of sentencing of center 12mm, transition are relaxed with the big fillet 16 of radius R=25mm in the jointing place of diapire 14 and inner circle wall 15 in fire deck, can better bear shearing stress and reduce fire deck bottom surface radial temperature, avoid stress to concentrate, improve functional reliability.

Claims

1, a kind of cylinder cover for diesel engine, this cylinder head (1) is provided with the fuel-injection pore (3) of straight dress oil sprayer, two inlet valve hole (2) and two air release valve holes (4) are formed four valves, intake duct (9) and air outlet flue (5) set up both sides separately, delivery valve seat mounting hole (6) communicates with air outlet flue, also be provided with safe valve opening (12) that indicator valve is installed and the starting valve hole (10) that starting valve is installed, the cylinder head bottom has the fire deck (8) of sealing seam (7) and forms end back of the body double layer construction with central diaphragm (13), it is characterized in that the double bottom structure of the back of the body double layer construction of the described end for the strong back of the body in the thin end; Diapire (14) is the slope shape structure that is outwards increased gradually by the center in the described fire deck.

2, cylinder cover for diesel engine according to claim 1 is characterized in that diapire (14) relaxes transition with inner circle wall (15) for big fillet (16) in the described fire deck.