CN212054921U - Piston structure for optical single-cylinder engine and optical single-cylinder engine - Google Patents
Piston structure for optical single-cylinder engine and optical single-cylinder engine Download PDFInfo
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- CN212054921U CN212054921U CN202020657890.4U CN202020657890U CN212054921U CN 212054921 U CN212054921 U CN 212054921U CN 202020657890 U CN202020657890 U CN 202020657890U CN 212054921 U CN212054921 U CN 212054921U
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Abstract
The utility model provides a piston structure and optics single cylinder engine for optics single cylinder engine, the piston structure for optics single cylinder engine includes glass cylinder liner and metal piston, and the metal piston includes upper piston and connects in the lower piston of the lower extreme of upper piston, and the outer top shape of upper piston is the same with the outer top shape of the piston of actual engine; the upper end of the upper piston extends into the glass cylinder sleeve. The metal piston is matched with the glass cylinder sleeve, and the condition in the cylinder can be observed through the glass cylinder sleeve, so that an optical test is realized, the structure is simplified, and the cost is reduced; the metal piston is adopted, so that the shape of the outer top of the upper piston is conveniently processed to be the same as the shape of the outer top of the piston of the multi-cylinder engine, the consistency of the in-cylinder flow field of the optical single-cylinder engine and the in-cylinder flow field of the actual engine in the experimental process is ensured, the accuracy of the compression ratio is improved, and the test accuracy is improved.
Description
Technical Field
The utility model belongs to the engine field especially relates to a piston structure and optics single cylinder engine for optics single cylinder engine.
Background
The optical single-cylinder engine can measure the whole engine combustion process such as in-cylinder flow field distribution, spray development, oil-gas mixing, flame propagation, emission generation and the like by using a high-speed photography technology, a Particle Image Velocimetry (PIV) and other related optical testing technologies, and is convenient for evaluating a combustion system and guiding the design of the engine combustion system. Therefore, the optical single-cylinder engine has higher utilization rate, can be used in the early stage of engine project development to verify whether the design of a combustion system meets the design requirements, and can perform work such as oil injector and camshaft model selection to shorten the development period of the engine.
At present, a piston used on an optical single-cylinder engine mostly uses a glass top piston, a reflector is embedded in the glass top piston to assist shooting, and due to the reason of quartz glass materials, the top of the piston can only be processed into a flat top, so that the piston has a large difference with the actual piston top of the engine, both a flow field and a compression ratio in an engine cylinder are influenced, the top of the piston and a glass window are not tightly sealed, the risk of air leakage exists, and the test accuracy is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: aiming at the problem that the existing scheme influences the test accuracy, the piston structure for the optical single-cylinder engine and the optical single-cylinder engine are provided.
In order to solve the technical problem, an embodiment of the present invention provides a piston structure for an optical single cylinder engine, including a glass cylinder sleeve and a metal piston, where the metal piston includes an upper piston and a lower piston connected to a lower end of the upper piston, and an outer top shape of the upper piston is the same as an outer top shape of a piston of an actual engine; the upper end of the upper piston extends into the glass cylinder sleeve.
Optionally, the device further comprises an adjusting gasket and a connecting bolt;
the adjusting gasket is positioned between the lower side of the upper piston and the upper side of the lower piston;
the connecting bolt connects the upper piston and the lower piston and clamps the adjusting gasket between the upper piston and the lower piston.
Optionally, a compressed air pipe is further included;
an upper cavity is arranged in the upper piston and penetrates through the lower end of the upper piston;
a lower cavity is arranged in the lower piston and penetrates through the upper end and the lower end of the lower piston;
the upper cavity is communicated with the lower cavity;
the compressed air pipe penetrates through the lower piston and is used for introducing compressed air into the upper piston.
Optionally, the air outlet of the compressed air pipe is positioned in the lower piston and points to the inner top of the upper piston.
Optionally, the connecting bolt is of a hollow structure, and the connecting bolt is located in the metal piston and is respectively connected with the inner wall of the lower end of the upper cavity and the inner wall of the upper end of the lower cavity.
Optionally, the piston assembly further comprises a positioning pin, wherein the positioning pin is arranged between the upper piston and the lower piston and limits the relative rotation of the upper piston and the lower piston.
Optionally, the upper piston is provided with a positioning hole penetrating through the circumferential side wall of the upper cavity, the lower piston is provided with a positioning groove penetrating through the circumferential side wall of the lower cavity, an opening for the positioning pin to be clamped is formed in the upper side of the positioning groove, and the positioning pin penetrates through the positioning hole and the positioning groove.
Optionally, the piston assembly further comprises an upper piston ring sleeved outside the upper piston, a lower piston side pressure ring sleeved at the upper end of the lower piston, and a lower piston first ring, a lower piston second ring and an oil ring sequentially sleeved at the lower end of the lower piston from top to bottom.
Optionally, the top of the glass cylinder liner is roof-shaped.
The embodiment of the utility model provides an optics single cylinder engine is still provided, including cylinder cap, metal cylinder liner and aforementioned piston structure, the cylinder cap bonding is fixed in the top of glass cylinder liner, metal piston's lower extreme slidable mounting in the metal cylinder liner.
The embodiment of the utility model provides a piston structure and optics single cylinder engine for optics single cylinder engine, metal piston and glass cylinder liner cooperate, need not to set up glass top cap at the top of piston and set up the speculum in the inside of piston, can observe the jar interior condition through the glass cylinder liner, realize the optics experiment, simplified the structure, the cost is reduced; the metal piston is adopted, namely the upper piston and the lower piston are both made of metal materials, so that the outer top shape of the upper piston is conveniently processed to be the same as the outer top shape of the piston of the multi-cylinder engine, the consistency of the in-cylinder flow field of the optical single-cylinder engine and the in-cylinder flow field of the actual engine in the experimental process is ensured, the accuracy of the compression ratio is improved, and the experimental accuracy is improved.
Drawings
Fig. 1 is a schematic partial structural view of an optical single cylinder engine according to an embodiment of the present invention;
FIG. 2 is an enlarged view taken at A in FIG. 1;
FIG. 3 is an enlarged view at B of FIG. 1;
FIG. 4 is a cross-sectional view of the upper piston of FIG. 1;
FIG. 5 is a schematic view of the lower piston of FIG. 1;
FIG. 6 is a schematic view of the glass cylinder liner of FIG. 1;
the reference numerals in the specification are as follows:
1. a cylinder cover; 2. a glass cylinder sleeve;
31. an upper piston; 311. an upper cavity; 312. positioning holes; 32. a lower piston; 321. a lower cavity; 322. positioning a groove;
4. adjusting the gasket; 5. a connecting bolt;
6. a compressed air pipe; 61. an air outlet;
7. positioning pins;
81. an upper piston ring; 82. a lower piston side compression ring; 83. a lower piston ring; 84. a lower piston bicyclo ring; 85. and an oil ring.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
As shown in fig. 1, an embodiment of the present invention provides a piston structure for an optical single cylinder engine, including a glass cylinder sleeve 2 and a metal piston, where the metal piston includes an upper piston 31 and a lower piston 32 connected to a lower end of the upper piston 31, and an outer top shape of the upper piston 31 is the same as an outer top shape of a piston of an actual engine;
the upper end of the upper piston 31 extends into the glass cylinder sleeve 2, and the lower ends of the lower piston 32 and the upper piston 31 are slidably mounted in a metal cylinder sleeve (not shown) of the optical single-cylinder engine, and the metal cylinder sleeve guides the upper piston 31 and the lower piston 32 when in use.
Compared with the prior art, the piston structure for the optical single-cylinder engine provided by the embodiment of the utility model has the advantages that the metal piston is matched with the glass cylinder sleeve 2, a glass top cover is not required to be arranged at the top of the piston, a reflector is not required to be arranged inside the piston, the condition in the cylinder can be observed through the glass cylinder sleeve 2, the optical test is realized, the structure is simplified, and the cost is reduced; the metal pistons are adopted, namely the upper piston 31 and the lower piston 32 are both made of metal materials, so that the shape of the outer top of the upper piston 31 is conveniently processed to be the same as that of the outer top of the piston of the multi-cylinder engine, the problem that the shape of the outer top of the upper piston 31 is different from that of the outer top of the piston of the multi-cylinder engine due to the fact that the top of the existing upper piston 31 is made of quartz glass is avoided, the consistency of an in-cylinder flow field of the optical single-cylinder engine and an in-cylinder flow field of an actual engine in an experimental process is guaranteed, the accuracy of a compression ratio.
Preferably, as shown in fig. 1 and 6, the glass cylinder liner 2 is a ridge-shaped glass cylinder liner 2, that is, the top of the glass cylinder liner 2 is ridge-shaped, and the conditions in the cylinder (such as flow field and flame propagation in the whole combustion chamber, opening and closing conditions of an intake valve and an exhaust valve, an oil-gas mixture condition near a spark plug, and a state at the initial stage of flame development) can be observed more intuitively, conveniently and comprehensively through the ridge-shaped glass cylinder liner 2.
Preferably, the metal piston is made of aluminum alloy, and is machined by CNC (computer numerical control), so that the machining is simple, the cost is low, and the machining period is short.
In one embodiment, as shown in fig. 2, the device further comprises an adjusting gasket 4 and a connecting bolt 5;
the adjusting shim 4 is located between the lower side of the upper piston 31 and the upper side of the lower piston 32;
the connecting bolt 5 connects the upper piston 31 and the lower piston 32, and clamps the adjusting shim 4 between the upper piston 31 and the lower piston 32. The upper piston 31 and the lower piston 32 can be conveniently connected, the adjusting gaskets 4 with different thicknesses can be replaced according to requirements, or the height of the metal piston can be changed, so that the compression ratio can be adjusted in a very simple and low-cost mode.
In one embodiment, as shown in fig. 1, further comprises a compressed air pipe 6;
an upper cavity 311 is arranged in the upper piston 31, and the upper cavity 311 penetrates through the lower end of the upper piston 31;
a lower cavity 321 is arranged in the lower piston 32, and the lower cavity 321 penetrates through the upper end and the lower end of the lower piston 32;
the upper cavity 311 communicates with the lower cavity 321;
the compressed air pipe 6 is arranged on the lower piston 32 in a penetrating mode and used for introducing compressed air into the upper piston 31 so as to cool the upper piston 31 in the working process of the optical single-cylinder engine and prevent the deformation of the top of the upper piston 31 caused by overhigh explosion pressure.
Preferably, whether or not the adjusting washer 4 is provided, when the connecting bolt 5 is provided:
as shown in fig. 1 and 2, the connecting bolt 5 is a hollow structure, is located in the metal piston, and is respectively connected to the inner wall of the lower end of the upper cavity 311 and the inner wall of the upper end of the lower cavity 321 to communicate the upper cavity 311 and the lower cavity 321. The connecting bolt 5 is internally arranged, so that the upper piston 31 and the lower piston 32 can be conveniently and reliably connected, meanwhile, extra holes do not need to be drilled in the upper piston 31 and the lower piston 32, the connecting bolt 5 is of a hollow structure and can be communicated with the upper cavity 311 and the lower cavity 321, and compressed air can be blown into the upper piston 31 by the compressed air pipe 6 on the lower piston 32; the compressed air pipe 6 is arranged on the lower piston 32, so that the interference generated when the upper piston 31 moves up and down can be avoided, and the installation position of the compressed air pipe 6 ensures that the metal piston does not interfere at the bottom dead center.
In one embodiment, as shown in FIG. 1, the outlet 61 of the compressed air tube 6 is located within the lower piston 32 and points to the inner top of the upper piston 31; the structure of the compressed air pipe 6 is simplified, and the compressed air pipe 6 blows compressed air toward the inner top of the upper piston 31, so that the compressed air can flow downwards after being sufficiently heat-exchanged with the inner top of the upper piston 31, and can flow out of the metal piston from the lower end of the lower piston 32.
In one embodiment, as shown in fig. 2, the positioning pin 7 is further included, and the positioning pin 7 is disposed between the upper piston 31 and the lower piston 32 and limits the relative rotation between the upper piston 31 and the lower piston 32. The axial positioning and the circumferential positioning between the upper piston 31 and the lower piston 32 can be realized through the connecting bolt 5 and the positioning pin 7, so that the connection between the upper piston 31 and the lower piston 32 is safer and more reliable.
Specifically, as shown in fig. 2, 4 and 5, the upper piston 31 is provided with a positioning hole 312 penetrating through the circumferential side wall of the upper cavity 311, the lower piston 32 is provided with a positioning groove 322 penetrating through the circumferential side wall of the lower cavity 321, an opening for the positioning pin 7 to be inserted is formed on the upper side of the positioning groove 322, and the positioning pin 7 penetrates through the positioning hole 312 and the positioning groove 322 and limits the upper piston 31 and the lower piston 32 to rotate relatively. Simple structure, the assembly of being convenient for fixes locating pin 7 on last piston 31 earlier, and the chucking that makes progress of piston 32 again can be so that locating pin 7 from the upside of constant head tank 322 downwards block in the constant head tank 322 to the relative rotation of piston 31 and lower piston 32 is gone up in the restriction.
In an embodiment, as shown in fig. 1 and 2, the glass cylinder liner further includes an upper piston ring 81 sleeved outside the upper piston 31, where the upper piston ring 81 is used for being in sliding fit with the metal cylinder liner and guiding the moving direction of the upper piston 31, so as to ensure that the moving direction of the upper piston 31 is a vertical direction, and avoid collision between the upper piston 31 and the glass cylinder liner 2; go up piston ring 81 and be located glass cylinder liner 2 below in metal piston's activity stroke, prevent to go up piston ring 81 and glass cylinder liner 2 direct contact, reduce the cracked risk of glass cylinder liner 2.
In one embodiment, as shown in fig. 2 and 3, the piston further includes a lower piston side compression ring 82 disposed at an upper end of the lower piston 32, and a lower piston one ring 83, a lower piston two ring 84, and an oil ring 85 disposed at a lower end of the lower piston 32 in this order from top to bottom;
the lower piston side compression ring 82 is used for being in sliding fit with the metal cylinder sleeve and guiding the movement direction of the lower piston 32 straight;
the lower piston ring 83 is used for being in sealing sliding fit with the metal cylinder sleeve and ensuring the air seal between the lower piston 32 and the metal cylinder sleeve;
the lower piston ring 84 is used for sliding fit with the metal cylinder sleeve and guiding the moving direction of the lower piston 32 straight;
the oil ring 85 is used for sliding fit with the metal cylinder liner and realizes oil sealing between the lower piston 32 and the metal cylinder liner.
The lower piston side pressure ring 82 and the lower piston two ring 84 guide the movement direction of the lower piston 32 to be straight together, so that the verticality is ensured, the lower piston one ring 83 and the oil ring 85 ensure the sealing property between the lower piston 32 and the metal cylinder sleeve, and the test accuracy is ensured.
As shown in FIG. 1, the embodiment of the utility model provides an optics single cylinder engine is still provided, including cylinder cap 1, metal cylinder liner and the piston structure that any preceding embodiment mentioned, the bonding of cylinder cap 1 is fixed in the top of glass cylinder liner 2.
As shown in fig. 1, when the glass cylinder liner 2 is a roof-ridge shaped glass cylinder liner 2, the cylinder head 1 is correspondingly designed as an inverted roof-ridge shaped cylinder head 1, i.e. the bottom of the cylinder head 1 is roof-ridge shaped.
The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A piston structure for an optical single cylinder engine, characterized by: the piston comprises a glass cylinder sleeve and a metal piston, wherein the metal piston comprises an upper piston and a lower piston connected to the lower end of the upper piston, and the shape of the outer top of the upper piston is the same as that of the outer top of a piston of an actual engine; the upper end of the upper piston extends into the glass cylinder sleeve.
2. The piston structure for an optical single cylinder engine according to claim 1, characterized in that: the device also comprises an adjusting gasket and a connecting bolt;
the adjusting gasket is positioned between the lower side of the upper piston and the upper side of the lower piston;
the connecting bolt connects the upper piston and the lower piston and clamps the adjusting gasket between the upper piston and the lower piston.
3. The piston structure for an optical single cylinder engine according to claim 2, characterized in that: the device also comprises a compressed air pipe;
an upper cavity is arranged in the upper piston and penetrates through the lower end of the upper piston;
a lower cavity is arranged in the lower piston and penetrates through the upper end and the lower end of the lower piston;
the upper cavity is communicated with the lower cavity;
the compressed air pipe penetrates through the lower piston and is used for introducing compressed air into the upper piston.
4. The piston structure for an optical single cylinder engine according to claim 3, characterized in that: and the air outlet of the compressed air pipe is positioned in the lower piston and points to the inner top of the upper piston.
5. The piston structure for an optical single cylinder engine according to claim 3, characterized in that: the connecting bolt is of a hollow structure and is positioned in the metal piston and respectively connected with the inner wall of the lower end of the upper cavity and the inner wall of the upper end of the lower cavity.
6. The piston structure for an optical single cylinder engine according to claim 5, characterized in that: the positioning pin is arranged between the upper piston and the lower piston and limits the relative rotation of the upper piston and the lower piston.
7. The piston structure for an optical single cylinder engine according to claim 6, characterized in that: the upper piston is provided with a positioning hole penetrating through the circumferential side wall of the upper cavity, the lower piston is provided with a positioning groove penetrating through the circumferential side wall of the lower cavity, the upper side of the positioning groove is provided with an opening for the positioning pin to be clamped in, and the positioning pin penetrates through the positioning hole and the positioning groove.
8. The piston structure for an optical single cylinder engine according to claim 1, characterized in that: the piston ring assembly further comprises an upper piston ring sleeved outside the upper piston, a lower piston side pressure ring sleeved at the upper end of the lower piston, and a lower piston first ring, a lower piston second ring and an oil ring which are sequentially sleeved at the lower end of the lower piston from top to bottom.
9. Piston structure for optical single cylinder engine according to any of claims 1 to 8, characterized in that: the top of the glass cylinder sleeve is in a ridge shape.
10. The utility model provides an optics single cylinder engine, includes cylinder cap and metal cylinder liner, its characterized in that: the piston structure of any one of claims 1-9 further comprising a cylinder cover adhesively secured to the top of the glass cylinder liner, the lower end of the metal piston being slidably mounted within the metal cylinder liner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020657890.4U CN212054921U (en) | 2020-04-26 | 2020-04-26 | Piston structure for optical single-cylinder engine and optical single-cylinder engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020657890.4U CN212054921U (en) | 2020-04-26 | 2020-04-26 | Piston structure for optical single-cylinder engine and optical single-cylinder engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212054921U true CN212054921U (en) | 2020-12-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020657890.4U Active CN212054921U (en) | 2020-04-26 | 2020-04-26 | Piston structure for optical single-cylinder engine and optical single-cylinder engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212054921U (en) |
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2020
- 2020-04-26 CN CN202020657890.4U patent/CN212054921U/en active Active
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