CN214741712U - Heat insulation piston with ceramic insert - Google Patents

Abstract

The utility model relates to a heat-insulating piston with a ceramic insert. The piston comprises a ceramic insert, a brazing layer, a piston base, a piston pin and a piston connecting rod; The brazing layer is welded on the top surface of the piston base, and the piston connecting rod is installed in the piston inner cavity of the piston base through the piston pin, and moves up and down under the driving of the piston pin. The piston of the utility model is mainly used in high-temperature and high-pressure diesel engines, and can effectively reduce the heat conducted to the base material of the piston, improve the thermal insulation performance and thermal stress of the piston, and increase the service life of the piston in an extremely harsh engine environment.

Description

Heat insulation piston with ceramic insert

Technical Field

The utility model relates to a piston belongs to internal-combustion engine technical field, especially relates to a thermal-insulated piston with pottery is inserted.

Background

The internal combustion engine is the power machine with highest thermal efficiency and most extensive application at present, and is widely applied to the fields of automobiles, non-road mobile machinery and the like. With the progress of science and technology, the application of an internal combustion engine in the aspect of heavy machinery is more and more extensive, the internal combustion engine also develops towards the trends of high power, light weight and the like, the environment in a cylinder of the internal combustion engine is continuously severe due to the improvement of power, metal made of common materials cannot bear the high-temperature and high-pressure working environment, the fuel economy is reduced due to the increase of the mass in the application process of a piston designed by high-strength steel, and the piston can meet the requirement of light weight under the condition of meeting the normal working condition. On the basis of a general aluminum alloy base material, attempts have been made to perform a top surface heat insulation treatment of a piston by using a zirconia thermal barrier coating or the like, but the life of the piston often fails to meet the requirements due to the defects that zirconia itself is easy to fall off and cracks are easy to occur.

Disclosure of Invention

The life problem to piston in the current engine cylinder, the utility model provides a thermal-insulated piston with pottery is inserted, it is through inserting the pottery and adhere to piston base body top surface, improves the life of piston when reaching effective thermal-insulated effect.

The utility model discloses a concrete technical scheme as follows:

a heat insulated piston having a ceramic insert, the piston comprising a ceramic insert, a braze layer, a piston base, a piston pin, a piston connecting rod; the ceramic insert with the heat insulation hole inside is welded on the top surface of the piston base body through the brazing layer, and the piston connecting rod is installed in a piston inner cavity of the piston base body through the piston pin and moves up and down under the driving of the piston pin.

Further, the ceramic insert is a silicon nitride ceramic insert.

Further, the distribution and shape of the insulation pores in the ceramic insert are obtained by topological optimization.

Furthermore, the center of the ceramic insert is provided with one heat insulation pore, and a plurality of heat insulation pores are uniformly distributed around the center of the ceramic insert.

Further, the shape of the heat insulation pore at the center of the ceramic insert is a symmetrical structure surrounding the center of the ceramic insert.

Further, the porosity of the plurality of heat insulation pores around the ceramic insert is 10% -30%.

Further, the brazing layer is formed by welding brazing materials matched with the thermodynamic properties of the piston base body and the ceramic insert.

Furthermore, a plurality of cooling oil ducts are symmetrically arranged above the piston inner cavity in the piston base body.

The utility model has the advantages that:

the utility model discloses a piston simple structure, design benefit has advantages such as high temperature resistant, intensity is high, the quality is light, longe-lived, can satisfy abominable internal-combustion engine environment, improves internal-combustion engine equipment's reliability.

The utility model discloses a piston top adopts the pottery to insert and insulates against heat, and the pottery inserts the inside thermal-insulated hole, and the cooling system of cooperation piston can balance the heat transfer capacity that the pottery was inserted effectively, reduces the thermal stress of piston base member, reaches the best thermal-insulated effect, improves the life of piston effectively. Meanwhile, the ceramic insert obtained through topology optimization has lighter weight, meets the requirement of lightweight piston, and also improves the fuel economy of the internal combustion engine.

Drawings

FIG. 1 is a schematic view of the structure of the heat-insulating piston with ceramic insert of the present invention;

FIG. 2 shows the result of the topology optimization design of the present invention;

fig. 3 shows the temperature field distribution of the topology optimization piston model under the heat load.

Wherein: 1-heat insulation pore, 2-ceramic insert, 3-brazing layer, 4-piston base body, 5-cooling oil channel, 6-piston pin, 7-piston inner cavity and 8-piston connecting rod.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present application, the present invention will be further described in detail with reference to the accompanying drawings and examples.

The terms of orientation such as up, down, left, right, front, and rear in the present specification are established based on the positional relationship shown in the drawings. The corresponding positional relationship may also vary depending on the drawings, and therefore, should not be construed as limiting the scope of protection.

The present invention relates to a portable electronic device, and more particularly, to a portable electronic device, which can be connected to a portable electronic device, and can be connected to a portable electronic device through a connection structure, such as a connector, a. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The embodiment describes a heat insulation piston with a ceramic insert, which is mainly applied to a high-temperature and high-pressure diesel engine, and the ceramic insert with a specific structure is designed through topological optimization according to the requirements of heat transfer capacity and alternating pressure in an engine cylinder, so that the ceramic insert is used for replacing a coating structure heated on the top surface of the piston, and is attached to the top surface of the piston in a brazing mode, thereby improving the heat insulation performance and the thermal stress of the piston and prolonging the service life of the piston.

As shown in fig. 1, the piston includes a ceramic insert 2, a brazing layer 3, a piston base 4, a piston pin 6, and a piston connecting rod 8. The ceramic insert 2 is welded on the top surface of the piston base body 4 through the brazing layer 3 and is arranged coaxially with the piston base body 4. The upper part of the piston base body 4 is symmetrically provided with cooling oil passages 5, the center of the piston base body is provided with a piston inner cavity 7, and a piston connecting rod 8 is arranged in the piston inner cavity 7 through a piston pin 6.

The ceramic insert 2, which is used for thermal insulation, is mainly made of silicon nitride ceramic, and is designed by a topology optimization method, and the interior of the ceramic insert contains a certain number of thermal insulation pores 1.

The distribution and the shape of the heat insulation pores 1 are obtained by applying a topological optimization technology to obtain an analysis result, optimizing the shape according to the analysis result and then performing engineering treatment. The heat insulation structure is characterized in that a heat insulation hole 1 is arranged in the center of a ceramic insert 2 and is in a symmetrical structure surrounding the center of the ceramic insert 2, a plurality of heat insulation holes 1 are uniformly distributed around the center heat insulation hole 1 on the periphery of the ceramic insert 2, preferably, the plurality of heat insulation holes 1 are designed according to the porosity of 10% -30%, and the strength requirement is met while the heat insulation is met. As shown in fig. 2, the present embodiment symmetrically arranges two insulation apertures 1 on both left and right sides of the central insulation aperture 1. The ceramic insert 2 with the heat insulation holes 1 is shown in fig. 3, and can effectively balance heat at the top of the piston, further effectively reduce heat transferred to the piston base body 4, reduce thermal stress of the piston base body 4, and greatly improve heat distribution in a piston coating structure.

Because the ceramic insert 2 has the heat insulation hole 1, if the common manufacturing is adopted, the difficulty is high, and the ceramic insert 2 is manufactured by adopting a ceramic material additive manufacturing mode in the embodiment, so that the manufacturing difficulty can be reduced.

The brazing layer 3 is formed by brazing material, and since the performance of the brazing material determines the adhesion performance of the ceramic insert 2, the brazing layer 3 of the embodiment is welded by using brazing material matched with the thermodynamic performance of the piston base material 4 and the ceramic insert 2.

In the working process of the piston, the piston connecting rod 8 moves up and down under the driving of the piston pin 6, and bottom cooling liquid is brought into the piston inner cavity 7 to cool the piston base body 4. The ceramic insert 2 is matched with the plurality of cooling oil ducts 5 and the cooling liquid on the piston base body 4, so that the cooling can be better carried out, the thermal stress in the piston base body 4 is balanced, the heat insulation capacity of the piston in a high-temperature environment is effectively improved, the thermal stress is balanced, the working stability of the piston is improved, and the service life of the piston is prolonged.

While the principles of the invention have been described in detail in connection with the preferred embodiments thereof, it will be understood by those skilled in the art that the above-described embodiments are merely illustrative of exemplary implementations of the invention and are not limiting of the scope of the invention. The details in the embodiments do not constitute the limitations of the scope of the present invention, and any obvious changes such as equivalent transformation, simple replacement, etc. based on the technical solution of the present invention all fall within the protection scope of the present invention without departing from the spirit and scope of the present invention.

Claims (8)

1. An insulated piston with a ceramic insert, characterized in that the piston comprises a ceramic insert (2), a brazing layer (3), a piston base (4), a piston pin (6), a piston connecting rod (8); the ceramic insert (2) with the heat-insulating pores (1) inside is welded and disposed on the top surface of the piston base (4) through the brazing layer (3), and the piston connecting rod ( 8) The piston pin (6) is installed in the piston inner cavity (7) of the piston base body (4), and moves up and down under the driving of the piston pin (6). 2 . The heat insulating piston with ceramic inserts according to claim 1 , wherein the ceramic inserts ( 2 ) are silicon nitride ceramic inserts. 3 . 3 . The heat insulating piston with ceramic inserts according to claim 1 , wherein the distribution and shape of the heat insulating pores ( 1 ) in the ceramic insert ( 2 ) are obtained by topology optimization. 4 . 4. The heat insulating piston with a ceramic insert according to claim 3, characterized in that, the center of the ceramic insert (2) is provided with one of the heat insulating pores (1), and the ceramic insert (2) A plurality of said heat insulating pores (1) are evenly distributed around said heat insulating pores (1) around the center. 5. The heat insulating piston with ceramic inserts according to claim 4, wherein the heat insulating pores (1) in the center of the ceramic inserts (2) are shaped to surround the ceramic inserts (2). ) centrosymmetric structure. 6 . The heat insulating piston with ceramic inserts according to claim 4 , wherein the porosity of the plurality of heat insulating pores ( 1 ) around the ceramic insert ( 2 ) is 10% to 30% 6 . %. 7. The thermally insulated piston with ceramic inserts according to claim 1, characterized in that, the brazing layer (3) adopts the thermodynamic properties of the piston base body (4) and the ceramic inserts (2) Matching brazing material is welded to form. 8. The thermally insulated piston with ceramic inserts according to claim 1, wherein a plurality of cooling oil passages (5) are symmetrically arranged above the piston inner cavity (7) in the piston base body (4). ).

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