CN101000259A

CN101000259A - Device for measuring volume of engine cylinder head combustion chamber

Info

Publication number: CN101000259A
Application number: CNA2006101560612A
Authority: CN
Inventors: 黄斌; 方映雪; 黄海阳
Original assignee: Hefei University of Technology
Current assignee: Hefei University of Technology
Priority date: 2006-12-31
Filing date: 2006-12-31
Publication date: 2007-07-18
Anticipated expiration: 2026-12-31
Also published as: CN100442026C

Abstract

The invention relates to engine cylinder cover combustion volume detecting device. Its feature is that it sets measuring head of which bottom end face sealed elastic capsule is set. And hydraulic pump is set in its main body. The hydraulic pump piston cavity, measuring head bottom end, and the elastic capsule are formed sealed liquid injecting elastic capsule cavity together. The invention can realize fast and exact online measuring for the engine cylinder cover combustion volume.

Description

Device for measuring volume of engine cylinder head combustion chamber

Technical field

The present invention relates to device for measuring volume of engine cylinder head combustion chamber.

Background technology

The size of volume of engine cylinder head combustion chamber has very big influence to engine performance.

The detection of engine cylinder head combustion chamber volume generally is to adopt titrimetry at present, load onto inlet valve, exhaust valve and spark plug during operation earlier, manage again the slit of inlet valve, exhaust valve and spark plug and contact position, firing chamber is sealed, water filling in the firing chamber at last, till filling with, determine the volume of firing chamber according to water injection rate.

Also there is the direct aeration of employing to measure, load onto inlet valve, exhaust valve during measurement earlier, with specific O-ring seal the slit of inlet valve, exhaust valve and contact position, firing chamber is sealed, with special stopper spark-plug hole is sealed, cover the firing chamber at last, in the firing chamber, inflate, charge into the volume of gas and the volume that the pressure in the firing chamber is obtained the firing chamber by measurement.

The major defect of titrimetry is that measurement accuracy is poor, and detection time is long, and manually-operated is loaded down with trivial details; And directly the aeration existing questions is that O-ring seal interchangeability is poor, demarcation is loaded down with trivial details, measuring accuracy is influenced by ambient temperature very big, and detection time is longer.

More than two kinds of methods all can not satisfy the requirement of online detection.

Summary of the invention

The present invention is for avoiding above-mentioned existing in prior technology weak point, provide a kind of fast, accurately, and can realize the device for measuring volume of engine cylinder head combustion chamber of on-line measurement.

The technical scheme that technical solution problem of the present invention is adopted is:

Design feature of the present invention is that measuring head is set, and on the bottom end face of measuring head, the elastic capsule that forms sealing with measuring head at periphery is set; In the measuring head body, hydraulic pump is set, constitutes the injection liquid elasticity blister cavities of sealing with plunger shaft, measuring head bottom end face and the elastic capsule of hydraulic pump jointly.

Design feature of the present invention is that also hydraulic pump comprises force (forcing) pump and testing pump, constitute the pressurized cylinder of force (forcing) pump and testing pump and detect cylinder and be separately positioned in the measuring head body, force (forcing) pump plunger shaft and testing pump plunger shaft all are communicated with injection liquid elasticity blister cavities, inject liquid elasticity blister cavities and are formed between force (forcing) pump plunger shaft, testing pump plunger shaft, measuring head bottom end face and the elastic capsule.

Design feature of the present invention also is to be provided with the adjusting cylinder in the gauge head body, regulate the regulating sleeve that is threaded in the cylinder, and the top of regulating sleeve is provided with plug, and the adjusting chamber that is formed by adjusting cylinder, regulating sleeve and plug is communicated with injection liquid elasticity blister cavities.

Compared with the prior art, beneficial effect of the present invention is embodied in:

1, the present invention is provided with elastic capsule, solves the sealing of topping up with elastic capsule, the problem of thoroughly having avoided the slit of inlet valve, exhaust valve and spark plug and contact position, firing chamber to be difficult to seal;

2, the present invention is measuring media with liquid, when having overcome gas as measuring media because the compressibility of gas and the big defective of pressure temperature influence of a certain amount of gas, thereby can measure volume of engine cylinder head combustion chamber quickly and accurately, satisfy the requirement of online detection.

Description of drawings

Fig. 1 is a sectional structure synoptic diagram of the present invention.

Fig. 2 is the A-A cut-open view of Fig. 1.

Fig. 3 is the engine cylinder head and combustion chamber cross-sectional schematic that is equipped with inlet valve, exhaust valve and spark plug.

Fig. 4 measures state one synoptic diagram for the present invention.

Fig. 5 measures state two synoptic diagram for the present invention.

Number in the figure: 1 detection piston, 2 regulating sleeves, 3 adjusting plugs, 4 pressurizing piston, 5 pressurized cylinder, 6 pressurization plug sealing rings, 7 inject liquid elasticity blister cavities, 8 gib screws, 9 trim rings, 10 elastic capsules, 11 detection piston packings, 12 detection springs, 13 detection cylinders, 14 measuring head bodies, 15 set screw, 16 inlet valves, 17 spark plugs, 18 exhaust valves, 19 cylinder head, 20 O-ring seals, 21 adjusting cylinders, 22 spark-plug hole plugs.

Below, in conjunction with the accompanying drawings the present invention is further described by embodiment.

Embodiment

Referring to Fig. 1, Fig. 2, measuring head is set, on the bottom end face of measuring head, the elastic capsule 10 that forms sealing with measuring head at periphery is set; In measuring head body 14, hydraulic pump is set, constitutes the injection liquid elasticity blister cavities 7 of sealing with plunger shaft, measuring head bottom end face and the elastic capsule of hydraulic pump jointly.

Shown in Figure 1, in concrete the enforcement, hydraulic pump comprises force (forcing) pump and testing pump, constitute the pressurized cylinder 5 of force (forcing) pump and testing pump and detect cylinder 13 and be separately positioned in the measuring head body 14, force (forcing) pump plunger shaft and testing pump plunger shaft all are communicated with injection liquid elasticity blister cavities 7, inject liquid elasticity blister cavities 7 and are formed between force (forcing) pump plunger shaft, testing pump plunger shaft, measuring head bottom end face and the elastic capsule.

Shown in Figure 2, in concrete the enforcement, in gauge head body 14, be provided with and regulate cylinder 21, regulate the regulating sleeve 2 that is threaded in the cylinder 21, it is in the height of regulating in the cylinder 21 to regulating sleeve 2 by threaded adjustment, thereby change the size of regulating the chamber, the top of regulating sleeve 2 is provided with plug 3, and the adjusting chamber that is formed by adjusting cylinder 21, regulating sleeve 2 and plug 3 is communicated with injection liquid elasticity blister cavities 7.Rotary regulating sleeve 2 can make it move up and down in regulating cylinder 21, thereby changes the volume by the airtight cavity that forms between elastic capsule 10, gauge head body 14 bottom end faces, pressurizing piston 4, detection piston 1 and adjusting cylinder 21, regulating sleeve 2 and the plug 3.O-ring seal 20 is installed on the regulating sleeve 2 and seals, plug 3 is installed by screw thread in regulating sleeve 2 upper ends, tighten plug 3 and can realize sealed connection between plug 3 and the regulating sleeve 2, unloading lower end cap 3 can be to regulating liquid make-up or emission gases and unnecessary liquid in the cylinder 21.

In concrete the enforcement, as shown in Figure 1, pressurized cylinder 5 directly is set in gauge head body 14 and detects cylinder 13, pressurizing piston 4 is installed in the pressurized cylinder 5 and can moves up and down under external force, O-ring seal 6 is installed on the pressurizing piston 4 and seals, detection piston 1 is installed in to detect in the cylinder 13 and also can moves up and down under external force, detection piston packing 11 is installed in to detect on the piston 1 and seals, set screw 15 is installed in the upper end of the detection cylinder 13 in the gauge head body 14, pass through spiral marking connection between set screw 15 and the gauge head body 14, detection springs 12 is enclosed within on the piston rod that detects piston 1, one end is pressed in and detects on the piston 1, the other end is pressed on the set screw 15, can change the power that detects on the piston 1 that acts on by rotation set screw 15, the end face that elastic capsule 10 is installed on the bottom end face of gauge head body 14 gauge head body 14 encases, trim ring 9 is pressed in the periphery of elastic capsule 10 on the end face of gauge head body 14, gib screw 8 tightly is pressed in trim ring 9 and elastic capsule 10 end face of gauge head body 14, thereby make the peripheral sealed of elastic capsule 10, elastic capsule 10, the end face of gauge head body 14, pressurizing piston 4, detect piston 1 and regulate cylinder 21, form an airtight cavity that is interconnected between regulating sleeve 2 and the plug 3, be filled with certain amount of fluid in this closed chamber.During non-measurement, the part of liquid remains in regulates in the cylinder 21 (shown in Figure 2), in the pressurized piston 4 suction pressurized cylinder 5 of remainder, when pressurizing piston 4 moves downward compressed liquid under external force, liquid will enter by elastic capsule 10, the bottom end face of gauge head body 14, pressurizing piston 4, detect piston 1 and regulate cylinder 21, the airtight cavity that forms between regulating sleeve 2 and the plug 3 (shown in Figure 2), therefore elastic capsule 10 expands, move downward in the process of pressurized cylinder 5 bottoms in pressurizing piston 4, liquid in the airtight cavity obtains pressure expands elastic capsule 10 gradually in the bags of cylinder cap 19, and the slit by inlet valve and installation place, firing chamber gradually of the air in the bags of cylinder cap 19, the slit of exhaust valve and installation place, firing chamber, discharge in the slit of the contact position of the end face of the slit of spark plug and installation place, firing chamber and trim ring 9 and cylinder cap 19, be close to the surface of the firing chamber of tested cylinder head 19 until elastic capsule 10, the fluid pressure in the after this airtight cavity continues to raise and promotes to detect piston 1 and rises to a certain height.

Shown in Figure 3, inlet valve 16 and exhaust valve 18 are installed in the cylinder head 19, and spark plug 17 connects firmly in cylinder head 17 by screw thread.

Shown in Figure 4, liquid in the pressurized cylinder 5 is pressed into by the bottom end face of elastic capsule 10, gauge head body 14, pressurizing piston 4, detects in the airtight cavity that forms between piston 1 and adjusting plug 2 and the plug 3 (referring to Fig. 2), elastic capsule 10 distendings also tightly are posted on the surface of firing chamber, and the pressure that detection piston 1 overcomes detection springs 12 is pulled to a certain definite height.

After changing the spark plug among Fig. 4 17 into spark-plug hole plug 22, the engine cylinder head and combustion chamber position is measured as shown in Figure 5, spark-plug hole plug 22 is installed in the cylinder head 17, clearance fit between spark-plug hole plug 22 and the cylinder head 17 is so that the Fast Installation of spark-plug hole plug 22 or taking-up.

The process of using measuring head shown in Figure 1 that volume of engine cylinder head combustion chamber shown in Figure 3 is measured is as follows:

At first measuring head is checked: the measuring head that will charge into certain quantity of fluid be pressed on known volume engine cylinder cap end face and to make trim ring 9 be pressed in the periphery of firing chamber peripheral, shift pressurizing piston 4 onto the end, write down and detect the height that piston 1 rises, and then pressurizing piston 4 drawn back, liquid 7 is withdrawn in the pressurized cylinder 5, detect piston 1 and get back to the bottom of detecting cylinder 13 this moment under the effect of detection springs 12, more whole measuring head lifted at last and get back to original position, finishes check;

Measuring head is pressed on the end face of tested engine cylinder cap and makes trim ring 9 be pressed in the periphery periphery of firing chamber, shift pressurizing piston 4 onto the end, observe to detect the height that piston 1 rises, compare and to calculate tested combustion chamber volume by detecting height that piston 1 rises when checking.

More than the process of Ce Lianging can be designed to automatic measurement machine, detects the height available sensors of piston 1 rising and measures, and calculates measurement result by microcomputer.

Claims

1, device for measuring volume of engine cylinder head combustion chamber is characterized in that being provided with measuring head, on the bottom end face of measuring head, the elastic capsule (10) that forms sealing with measuring head at periphery is set; In described measuring head body (14), hydraulic pump is set, constitutes the injection liquid elasticity blister cavities (7) of sealing with plunger shaft, measuring head bottom end face and the elastic capsule of hydraulic pump jointly.

2, device for measuring volume of engine cylinder head combustion chamber according to claim 1, it is characterized in that described hydraulic pump comprises force (forcing) pump and testing pump, constitute the pressurized cylinder (5) of described force (forcing) pump and testing pump and detect cylinder (13) and be separately positioned in the measuring head body (14), force (forcing) pump plunger shaft and testing pump plunger shaft all are communicated with injection liquid elasticity blister cavities (7), and described injection liquid elasticity blister cavities (7) is formed between force (forcing) pump plunger shaft, testing pump plunger shaft, measuring head bottom end face and the elastic capsule.

3, device for measuring volume of engine cylinder head combustion chamber according to claim 2, it is characterized in that in described gauge head body (14), being provided with adjusting cylinder (21), regulate the regulating sleeve (2) that is threaded in the cylinder (21), the top of regulating sleeve (2) is provided with plug (3), and the adjusting chamber that is formed by adjusting cylinder (21), regulating sleeve (2) and plug (3) is communicated with described injection liquid elasticity blister cavities (7).