CN113203570A - Compression expansion device and method of operation - Google Patents
Compression expansion device and method of operation Download PDFInfo
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- CN113203570A CN113203570A CN202110388617.5A CN202110388617A CN113203570A CN 113203570 A CN113203570 A CN 113203570A CN 202110388617 A CN202110388617 A CN 202110388617A CN 113203570 A CN113203570 A CN 113203570A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/02—Details or accessories of testing apparatus
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Abstract
The invention provides a compression expansion device and an operation method, comprising the following steps: the device comprises a single-cylinder engine, a visual constant-volume combustion bomb, a motor and a belt; the single-cylinder engine is connected with the motor through the belt, and the visual constant-volume combustion bomb is arranged on the single-cylinder engine; the visual constant-volume combustion bomb is provided with a plurality of window adapters, and the window adapters are provided with optical glass; the combustion chamber is communicated with the second cavity of the single-cylinder engine, and the piston is driven by the motor to move rapidly to create different flow field environments in the visual constant-volume combustion bomb for researching the ignition and combustion processes.
Description
Technical Field
The invention relates to the field of compression and expansion devices, in particular to a compression and expansion device and an operation method; in particular to a rapid compression-expansion device for the visual study of ignition and combustion processes and an operation method.
Background
The rapid compression and expansion device is a visual experimental device for researching the working process in the engine, can simulate the flow field of the engine under different working conditions, and can observe and research the ignition and combustion processes in the combustion chamber through an optical window by using a high-speed camera based on the rapid compressor, so that the rapid compressor is widely used in engine research.
Chinese patent CN110905764A discloses a small-sized fast compressor based on electromagnetic control, which mainly comprises a main combustion chamber system, a power system and an electromagnetic control circuit. The invention is provided with a special electromagnetic control circuit, needs a special change-over switch to change the current direction to control the motion trend of the piston, needs a sliding rheostat to change the current magnitude to change the electromagnetic force magnitude to control the motion speed of the piston, and needs a special laser ranging sensor to measure the position of the piston, so the invention has complex composition and complex control process.
Patent document CN102066710B relates to a reciprocating fluid working device including an internal combustion engine, a compressor and a pump. A series of arrangements for pistons and cylinders of unconventional construction are described, primarily for internal combustion engines operating without cooling. In which annular combustion or working chambers are provided, some with fluid flowing through an annular core, a single piston reciprocating between a pair of working chambers, tensioning valve actuation, a tensioning connection between the piston and crankshaft, an energy absorbing piston crank connection, a crankshaft supported on gas bearings, a cylinder rotating within a housing, an injector with components that reciprocate or rotate during fuel delivery.
Disclosure of Invention
In view of the deficiencies in the prior art, it is an object of the present invention to provide a compression and expansion device and method of operation.
According to the present invention, there is provided a compression-expansion device comprising: the device comprises a single-cylinder engine, a visual constant-volume combustion bomb, a motor and a belt;
the single-cylinder engine is connected with the motor through the belt, and the visual constant-volume combustion bomb is arranged on the single-cylinder engine;
the visual constant volume combustion bomb is provided with a plurality of window adapters, and the window adapters are provided with optical glass.
Preferably, the visual constant volume bomb further comprises: a spark plug, a top end cap, and a combustion chamber;
the spark plug is installed window adapter department, the top end cover is installed visual constant volume burning bullet top, visual constant volume burning bullet is inside to be set up the combustion chamber.
Preferably, a first cavity and a second cavity are arranged in the single-cylinder engine, the first cavity is communicated with the second cavity, the second cavity is cylindrical, and the combustion chamber is communicated with the second cavity through a connecting air passage;
the connecting air passage is arranged to be a tangential air passage which is beneficial to forming tumble flow in the combustion chamber, and the connecting air passage is replaced or arranged in different shapes according to different experimental needs.
Preferably, a crankshaft is installed in the first cavity, a piston is installed in the second cavity, and the crankshaft is connected with the piston through a connecting rod;
the piston moves along the axial direction of the second cavity through the crankshaft.
Preferably, the outer side of the single-cylinder engine is connected with a first rotating shaft, the first rotating shaft is connected with the crankshaft, a second rotating shaft is installed on the side face of the motor, and the second rotating shaft drives the first rotating shaft to rotate through the belt.
Preferably, the visual constant-volume combustion bomb is arranged to be a hexahedron, four window adapters are installed on the side face of the hexahedron, and the top end cover is installed at the top of the hexahedron;
the four window adapters are identical and are detachable.
Preferably, the top end cover is provided with a plurality of air passages, and the air passages control air inlet and air outlet through one-way valves.
Preferably, the top end cap is fitted with a cylinder pressure sensor for pressure monitoring.
Preferably, the piston is adjusted in movement speed by the motor, and the combustion chamber establishes a high-pressure environment through the movement of the piston;
the piston is connected through the transmission the motor is realized reaching set movement speed and stable operation in 1s after the motor starts, the combustion chamber passes through the piston is in reach set movement speed and stable operation realization in 1s after the motor starts reach experimental pressure in 1s after the motor starts, this device reaches quick compression expansion effect.
The present invention also provides a method of operating a compression expansion device comprising the steps of:
step S1, filling a specified amount of premixed gas prepared in advance into the visual constant-volume combustion bomb to enable the piston to fall to a bottom dead center;
step S2, the motor drives the crankshaft to rotate through the belt according to a specified rotating speed, the crankshaft drives the piston to move, and the position of the piston is calculated according to a transmission ratio and the rotating speed of the motor;
and step S3, the cylinder pressure sensor monitors the pressure in the cylinder in real time, and when the monitored pressure in the cylinder reaches a target pressure range and the piston moves to reach the crank angle range, the spark plug ignites.
Compared with the prior art, the invention has the following beneficial effects:
1. the combustion chamber is communicated with a second cavity of the single-cylinder engine, and the piston is driven by the motor to rapidly move to create different flow field environments in the visual constant-volume combustion bomb for researching the ignition and combustion processes;
2. a one-way valve can be arranged and connected with an external air source and the atmosphere to carry out air inlet or exhaust work; premixed gas with different proportions can be introduced according to requirements for researching ignition experiments with different equivalence ratios;
3. the cylinder pressure sensor can control the inflation in the visual constant-volume combustion bomb so as to control the environmental density in the visual constant-volume combustion bomb;
4. the window adapter can be used for replacing optical glass or installing spark plugs of different types according to experimental requirements;
5. the movement speed of the piston can be adjusted by adjusting the rotating speed of the motor so as to generate different flow field environments;
6. the device has simple structure, low cost and convenient maintenance;
7. the tangential air passage is arranged to be beneficial to forming tumble in the combustion chamber, and meanwhile, the connecting air passages with different shapes can be replaced or arranged according to different experimental requirements.
8. The high-speed motion of the piston is driven through the rotating speed of the control motor, the high-pressure environment is rapidly established in the combustion chamber, the actual moving speed of the piston can be adjusted according to specific experimental requirements, under most experimental requirements, the piston can reach the set rotating speed and stably operate in 1s after the motor is started, and the internal pressure of the combustion chamber can reach the specified experimental pressure in 1s after the motor is started.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic perspective view of a compression and expansion device;
FIG. 2 is a schematic diagram of a three-dimensional structure of a single-cylinder engine and a visual constant-volume combustion bomb;
FIG. 3 is a cross-sectional view of a single cylinder engine and a visual constant volume combustion bomb;
shown in the figure:
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
Example 1
As shown in fig. 1, a compression-expansion apparatus includes: the device comprises a single-cylinder engine 1, a visual constant-volume combustion bomb 2, a motor 5 and a belt 6; the single-cylinder engine 1 is connected with the motor 5 through a belt 6, and the visual constant-volume combustion bomb 2 is arranged on the single-cylinder engine 1; the visual constant volume bomb 2 is provided with a plurality of window adapters 4, and the window adapters 4 are provided with optical glass 9.
As shown in fig. 1 to 3, the visual constant volume bomb 2 further includes: spark plug, tip cap 3 and combustion chamber 11; the spark plug is arranged at the window adapter 4, the top end cover 3 is arranged at the top of the visual constant-volume combustion bomb 2, and a combustion chamber 11 is arranged in the visual constant-volume combustion bomb 2; the single-cylinder engine 1 is internally provided with a first cavity 14 and a second cavity 15, the first cavity 14 is communicated with the second cavity 15, the second cavity 15 is cylindrical, and the combustion chamber 11 is communicated with the second cavity 15 through a connecting air passage 12; a crankshaft 16 is arranged in the first cavity 14, a piston 13 is arranged in the second cavity 15, and the crankshaft 16 is connected with the piston 13 through a connecting rod 17; the piston 13 performs piston motion along the axial direction of the second cavity 15 through a crankshaft 16; the outer side of the single-cylinder engine 1 is connected with a first rotating shaft 7, the first rotating shaft 7 is connected with a crankshaft 16, a second rotating shaft 8 is arranged on the side surface of the motor 5, and the second rotating shaft 8 drives the first rotating shaft 7 to rotate through a belt 6; the visual constant-volume combustion bomb 2 is arranged to be a hexahedron, four window adapters 4 are installed on the side face of the hexahedron, and a top end cover 3 is installed at the top of the hexahedron; the four window adapters 4 are identical and are removable. The top end cover 3 is provided with a plurality of air passages 10, and the air passages 10 control air inlet and air outlet through one-way valves; the top end cover 3 is provided with a cylinder pressure sensor which is used for monitoring pressure; the connecting duct 12 is provided as a tangential type duct.
The piston 13 adjusts the movement speed through the motor 5, and the combustion chamber 11 establishes a high-pressure environment through the movement of the piston 13; piston 13 is connected motor 5 through the transmission and is realized reaching the setting movement speed and stably operating in 1s after motor 5 starts, and combustion chamber 11 reaches the setting movement speed and stably operates through piston 13 in 1s after motor 5 starts and realizes reaching experimental pressure in 1s after motor 5 starts, and this device reaches quick compression expansion effect.
The present invention also provides a method of operating a compression expansion device comprising the steps of:
step S1, filling a specified amount of premixed gas prepared in advance into the visual constant-volume combustion bomb 2 to enable the piston 13 to fall to a bottom dead center;
step S2, the motor 5 drives the crankshaft 16 to rotate through the belt 6 according to the designated rotating speed, the crankshaft 16 drives the piston 13 to move, and the position of the piston 13 is calculated according to the transmission ratio and the rotating speed of the motor 5;
in step S3, the cylinder pressure sensor monitors the in-cylinder pressure in real time, and when the monitored in-cylinder pressure reaches the target pressure range and the piston 13 moves to reach the crank angle range of the crank shaft 16, the spark plug ignites.
Example 2 is a preferred example of example 1.
Example 2
A compression expansion device comprises a single-cylinder engine 1, a visual constant-volume combustion bomb 2, and a motor 5 surrounding a belt 6; the top end cover 3 is provided with an air passage 10, a one-way valve and a cylinder pressure sensor are arranged on the top end cover, and the air passage 10 is used for controlling air inlet, air exhaust and pressure monitoring; the optical glass 9, the spark plug and the like are installed through the window adapter 4, the four window adapters 4 are consistent in overall dimension, complete interchangeability is formed among four sides of the visual constant-volume combustion bomb 2, and the practicability of the compression expansion device is improved; the window adapter 4 is arranged on the visual constant-volume combustion bomb 2 and can be detached, so that the cleaning of the combustion chamber 11 is facilitated; the motor 5 is arranged beside the single-cylinder engine 1 and drives the single-cylinder engine 1 to work by means of the belt 6.
Observe the 11 circumstances of combustion chamber through optics test technique in order to study ignition and combustion process, connect the passageway 12 for the passageway between visual constant volume burning bullet 2 and the single cylinder engine 1, set to tangential type air flue and help forming tumble flow in combustion chamber 11, can change or set up the connection air flue 12 of different shapes according to different experimental needs.
When the engine works, a specified amount of pre-mixed gas which is prepared in advance is filled into the visual constant-volume combustion bomb 2, so that the piston 13 of the single-cylinder engine 1 falls to a bottom dead center; then the motor 5 drives the piston 13 to move according to the specified rotating speed, and the position of the piston 13 can be calculated according to the transmission ratio and the rotating speed of the motor 5; the cylinder pressure sensor can monitor the pressure in the cylinder in real time, and when the monitored pressure in the cylinder reaches a target pressure range and the movement of the piston 13 reaches a target crankshaft 16 rotation angle range, the spark plug ignites;
in the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. A compression-expansion device, comprising: the device comprises a single-cylinder engine (1), a visual constant-volume combustion bomb (2), a motor (5) and a belt (6);
the single-cylinder engine (1) is connected with the motor (5) through the belt (6), and the visual constant-volume combustion bomb (2) is installed on the single-cylinder engine (1);
a plurality of window adapters (4) are installed on the visual constant volume combustion bomb (2), and optical glass (9) is installed on the window adapters (4).
2. The device according to claim 1, characterized in that said visual constant volume bomb (2) further comprises: a spark plug, a top end cover (3) and a combustion chamber (11);
the spark plug is installed window adapter (4) department, install top end cover (3) visual constant volume burning bullet (2) top, visual constant volume burning bullet (2) inside combustion chamber (11) that sets up.
3. The compression-expansion device of claim 2, wherein: a first cavity (14) and a second cavity (15) are arranged in the single-cylinder engine (1), the first cavity (14) is communicated with the second cavity (15), the second cavity (15) is cylindrical, and the combustion chamber (11) is communicated with the second cavity (15) through a connecting air passage (12);
the connecting air passage (12) is a tangential air passage.
4. The compression-expansion device of claim 3, wherein: a crankshaft (16) is arranged in the first cavity (14), a piston (13) is arranged in the second cavity (15), and the crankshaft (16) is connected with the piston (13) through a connecting rod (17);
the piston (13) is moved in the axial direction of the second cavity (15) by the crankshaft (16).
5. The compression-expansion device of claim 4, wherein: the single cylinder engine (1) outside is connected first pivot (7), first pivot (7) are connected bent axle (16), motor (5) side-mounting second pivot (8), second pivot (8) pass through belt (6) drive first pivot (7) rotate.
6. The compression-expansion device of claim 2, wherein: the visual constant-volume combustion bomb (2) is arranged to be a hexahedron, four window adapters (4) are installed on the side face of the hexahedron, and the top end cover (3) is installed at the top of the hexahedron;
the four window adapters (4) are identical and are detachable.
7. The compression-expansion device of claim 2, wherein: the top end cover (3) is provided with a plurality of air passages (10), and the air passages (10) control air inlet and air outlet through one-way valves.
8. The compression-expansion device of claim 5, wherein: and a cylinder pressure sensor is arranged on the top end cover (3) and used for monitoring pressure.
9. The compression-expansion device of claim 8, wherein: the piston (13) is adjusted in movement speed through the motor (5), and the combustion chamber (11) establishes a high-pressure environment through movement of the piston (13).
10. A method of operating the compression and expansion device of claim 9, comprising the steps of:
step S1, filling a specified amount of pre-mixed gas prepared in advance into the visual constant-volume combustion bomb (2) to enable the piston (13) to fall to a bottom dead center;
step S2, the motor (5) drives the crankshaft (16) to rotate through the belt (6) according to a specified rotating speed, the crankshaft (16) drives the piston (13) to move, and the position of the piston (13) is calculated according to a transmission ratio and the rotating speed of the motor (5);
and step S3, the cylinder pressure sensor monitors the pressure in the cylinder in real time, and when the monitored pressure in the cylinder reaches a target pressure range and the piston (13) moves to reach the rotation angle range of the crankshaft (16), the spark plug ignites.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110388617.5A CN113203570A (en) | 2021-04-12 | 2021-04-12 | Compression expansion device and method of operation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110388617.5A CN113203570A (en) | 2021-04-12 | 2021-04-12 | Compression expansion device and method of operation |
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| CN113203570A true CN113203570A (en) | 2021-08-03 |
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2021
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| US20160230645A1 (en) * | 2012-11-27 | 2016-08-11 | Board Of Trustees Of Michigan State University | Internal combustion engine |
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