CN202119499U

CN202119499U - Cylinder cover volume detecting device based on synchronous pressure measurement

Info

Publication number: CN202119499U
Application number: CN201120191405XU
Authority: CN
Inventors: 黄斌; 王兰兰; 陈照; 黄开辉; 王文涛; 张文伟; 陈世静; 张红英; 秦华杰; 李崧魁; 宋志刚; 徐伟倡
Original assignee: Hefei University of Technology
Current assignee: Hefei University of Technology
Priority date: 2011-06-08
Filing date: 2011-06-08
Publication date: 2012-01-18
Anticipated expiration: 2021-06-08

Abstract

The utility model discloses a cylinder cover volume detecting device based on a synchronous pressure measurement, which is characterized in that a gas source unit includes a first cylinder and a second cylinder. A first cylinder piston rod and a second cylinder piston rod are in linkage which enables gas in equal quantity to be discharged from rod cavities of the first cylinder and the second cylinder. A tested unit includes a closed combustion chamber cavity which is formed by a cover plate and a cylinder cover and communicated with the rod cavity of the first cylinder. A standard unit includes a standard column container which is communicated with the rod cavity of the second cavity and positioned in a same environmental condition with the tested unit. A tested unit barometer and a standard unit barometer are arranged on a first gas conveying pipeline and a second gas conveying pipeline respectively. A tested container and a standard container are filled with gas in equal quantity to measure the air pressure inside the tested container and the standard container, and accordingly the tested volume can be can be obtained according to equation of gas state, and influences of medium temperature on measurement precision in volume measurement by means of the inflation method can be overcome.

Description

Cylinder cover device for measuring volume based on the simultaneous pressure measurement

Technical field

The utility model relates to the cylinder cover device for measuring volume.

Background technology

At present, the method for one employing of detection of engine cylinder cover chamber volume has: titrimetry, aeration and elastic capsule topping up method etc.Titrimetry is measured poor accuracy, detection time is long, manually-operated is loaded down with trivial details; Directly aeration is simple to operate, but measuring accuracy is influenced by ambient temperature very big; Elastic capsule topping up method in use elastic capsule needs often to change, and operation is trouble comparatively.

The utility model content

The utility model is for avoiding above-mentioned existing in prior technology weak point; Provide a kind of with the cylinder cover device for measuring volume based on the simultaneous pressure measurement of gas as measuring media; Medium temperature improves measuring accuracy to the influence of measuring accuracy when measuring in the hope of overcoming aeration.

The utility model technical solution problem adopts following technical scheme:

The utility model is to comprise based on the design feature of the cylinder cover device for measuring volume that simultaneous pressure is measured:

Gas source unit: first cylinder and second cylinder are set respectively; First cylinder piston rod and second cylinder piston rod are the interlock body, and the interlock of said first cylinder piston rod and second cylinder piston rod makes the gas of discharging equivalent at the rod chamber of first cylinder and second cylinder as source of the gas;

Unit under test: form the firing chamber cavity that seals to have the cover plate and the cylinder head that connect through hole, said firing chamber cavity is communicated with the rod chamber of first cylinder through first gas pipe line, forms unit under test;

Reference cell: the volume receptacle that sets up standard, said volumetric standard is communicated with the formation reference cell through second gas pipe line with the rod chamber of second cylinder; Said reference cell and unit under test are in the same ambient condition;

Display unit: unit under test rain glass and reference cell rain glass are set respectively on said first gas pipe line and second gas pipe line.

The method that the cylinder cover device for measuring volume that the utility model utilization is measured based on simultaneous pressure detects is interlock first cylinder piston rod and second cylinder piston rod; Make win cylinder and second cylinder synchronously to unit under test and reference cell air feed; Obtain unit under test rain glass and the barometric demonstration atmospheric pressure value of reference cell, calculate the volume of firing chamber cavity again according to the equation of gas state.

Compared with present technology, the utility model beneficial effect is embodied in:

The utility model is to be measuring media with gas; Synchronously tested volume and orthobaric volume are charged into equivalent gas; And measure the gaseous tension in tested volume and the orthobaric volume simultaneously; Calculate the method for tested volume according to the equation of gas state, medium temperature is to the influence of measuring accuracy when measuring principle has overcome that aeration is measured volume, and it is simple to operate, measuring accuracy is high.

Description of drawings

Fig. 1 is the utility model principle schematic;

Label among the figure: 1 first cylinder; 2 second cylinders; 3 strap joints; 4 cover plates; 5 cover plate for sealing circles; 6 inlet valve plugs; 7 cylinder covers; 8 spark-plug hole plugs; 9 exhaust valve plugs; 10 firing chamber cavitys; 11 volumetric standards; 12 first gas pipe lines; 13 second gas pipe lines; 14 connect through hole; 15 unit under test rain glasss, 16 reference cell rain glasss.

Embodiment

Referring to Fig. 1, the cylinder cover device for measuring volume of measuring based on simultaneous pressure in the present embodiment comprises:

Gas source unit: first cylinder 1 and second cylinder 2 are set respectively; First cylinder piston rod and second cylinder piston rod are the interlock body, and the interlock of first cylinder piston rod and second cylinder piston rod makes gas in the rod chamber of first cylinder 1 and second cylinder 2 discharge equivalent as source of the gas; To be first cylinder be set to second cylinder that cylinder bore diameter equates in practical implementation, the equal diameters of first cylinder piston rod and second cylinder piston rod.

Unit under test: form the firing chamber cavity 10 that seals to have the cover plate 4 that connects through hole 14 with cylinder head 7, firing chamber cavity 10 is communicated with the rod chamber of first cylinder 1 through first gas pipe line 12, forms unit under test;

Reference cell: the volume receptacle 11 that sets up standard, volumetric standard 11 is communicated with the formation reference cell through second gas pipe line 13 with the rod chamber of second cylinder 2; Reference cell and unit under test are in the same ambient condition;

Display unit: unit under test rain glass 15 and reference cell rain glass 16 are set respectively on first gas pipe line 12 and second gas pipe line 13.

During MEASUREMENT OF STEAM cylinder cap volume; At first respectively cylinder cover inlet valve port, exhaust doorway and spark-plug hole are blocked with inlet valve plug 6, exhaust valve plug 9 and spark-plug hole plug 8; Again cover plate 4 is covered the mouth door of cylinder cover 7 and compress; Seal with O-ring seal 5 between cover plate 4 and the cylinder cover 7, form firing chamber cavity 10 at this moment between the combustor surface of cover plate 4 and cylinder cover 7; The rod chamber of first cylinder 1 is connected with firing chamber cavity 10 through the connection through hole 14 on first gas pipe line 12, strap joint 3 and the cover plate 4; The rod chamber of second cylinder 2 is connected with volumetric standard 11 through second gas pipe line 13; Unit under test rain glass 15 is arranged in first gas pipe line 12, is used for measuring the pressure of first gas pipe line 12; Reference cell rain glass 16 is arranged in second gas pipe line 13, is used for measuring the pressure of second gas pipe line 13;

Accurately the set up standard volume of container 11, make volumetric standard 11 volume and be attached thereto the volume sum that the volume sum of the second logical gas pipe line 13 equals the theoretical displacement of firing chamber cavity 10 and is attached thereto the first logical gas pipe line 12;

Drive the piston rod of first cylinder 1 and second cylinder 2; Make win cylinder 1 and second cylinder 2 respectively to firing chamber cavity 10 and volumetric standard 11 synchronous air feed; Firing chamber cavity 10 raises with volumetric standard 11 interior gaseous tensions; Piston rod until cylinder 1 and cylinder 2 arrives desired location, according to this moment unit under test rain glass 15 measure the gas pressure value of unit under test and reference cell with reference cell rain glass 16, calculate the volume of firing chamber cavity 10 by the equation of gas state.Because firing chamber cavity 10 is in the same atmospheric environment with gaseous tensions in the volumetric standard 11 all the time,, thereby can not influence measuring accuracy so the environmental gas temperature variation is synchronous to the influence of the gas pressure value of unit under test and reference cell.

In the practical implementation; The rod chamber volume that first cylinder 1 and second cylinder 2 can be set equals firing chamber cavity 10 and first gas pipe line, 12 volume sums five times, and first cylinder 1 and the initial position of second cylinder 2 before measurement are the maximum positions of rod chamber volume.The volume of container 11 of setting up standard equals the theoretical value of firing chamber cavity 10 volumes, and first gas pipe line 12 is the identical and equal in length of specification with second gas pipe line 13; Driving the piston rod of first cylinder 1 and second cylinder 2, is zero until the rod chamber volume; If the volume of firing chamber cavity 10 is V ₁, the volume of first gas pipe line 12 and second gas pipe line 13 is given value V ₂, the volume of volumetric standard 11 is V ₀, the reading of unit under test rain glass 15 is P ₁, the reading of reference cell rain glass 16 is P ₂, according to equation of gas state P ₁(V ₁+ V ₀)=P ₂(V ₂+ V ₀) draw:

V_{1} = \frac{P_{2} (V_{2} + V_{0})}{P_{1}} - V_{0}

。

Claims

1. cylinder cover device for measuring volume of measuring based on simultaneous pressure is characterized in that comprising:

Gas source unit: first cylinder (1) and second cylinder (2) are set respectively; First cylinder piston rod and second cylinder piston rod are the interlock body, and the interlock of said first cylinder piston rod and second cylinder piston rod makes gas in the rod chamber of first cylinder (1) and second cylinder (2) discharge equivalent as source of the gas;

Unit under test: form the firing chamber cavity (10) that seals to have the cover plate (4) that connects through hole with cylinder head (7), said firing chamber cavity (10) is communicated with the rod chamber of first cylinder (1) through first gas pipe line (12), forms unit under test;

Reference cell: the volume receptacle that sets up standard (11), said volumetric standard (11) is communicated with the formation reference cell through second gas pipe line (13) with the rod chamber of second cylinder (2); Said reference cell and unit under test are in the same ambient condition;

Display unit: on said first gas pipe line (12) and second gas pipe line (13), unit under test rain glass (15) and reference cell rain glass (16) are set respectively.