CN212079410U - Internal combustion engine air valve and internal combustion engine - Google Patents

Abstract

The utility model discloses an internal-combustion engine air valve belongs to the internal-combustion engine equipment field. The valve disc comprises a valve disc, wherein a first heat-resistant layer is arranged at the bottom of the valve disc; the first heat-resistant layer comprises a tungsten-copper alloy layer and an inorganic high-temperature-resistant anticorrosive coating, the tungsten-copper alloy layer wraps the outer wall of the valve disc, and the inorganic high-temperature-resistant anticorrosive coating wraps the outer side of the tungsten-copper alloy layer; or the first heat resistant layer comprises a cermet hard alloy layer. An internal combustion engine is also disclosed. The utility model discloses set up first heat-resistant layer in the valve disc outside, utilized the better heat conductivility of tungsten copper alloy layer to cool down the valve disc to improve its high temperature resistance, utilize inorganic high temperature resistant anticorrosive coating to improve the holistic corrosion resisting property of valve disc, still can improve the heat resistance and the life of valve disc through the extremely high thermal hardness and the wearability in cermet carbide layer in addition.

Description

Internal combustion engine air valve and internal combustion engine

Technical Field

The application relates to the field of internal combustion engine equipment, in particular to an internal combustion engine air valve and an internal combustion engine.

Background

The gas valve is a component which opens and closes the piston engine in different working strokes, is an important component of a combustion chamber of the piston engine, is a passage for gas to enter and exit the combustion chamber, bears higher mechanical load and thermal load when in work, and particularly is an exhaust valve which is flushed by high-temperature gas at the moment and has a continuously high surface temperature. Although most of the existing air valves adopt austenitic heat-resistant steel, martensitic air valve steel and other steels with high strength and good heat resistance, when the existing air valves are used in a high-temperature environment for a long time, the surface temperature of the air valve is overhigh, so that the phenomena of air leakage, shortened service life and the like are easily caused, and the working efficiency of an internal combustion engine is directly influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that overcome prior art's defect, provide an internal-combustion engine pneumatic valve and internal-combustion engine that have high temperature resistant and corrosion-resistant function, avoid the pneumatic valve surface to appear corroding, scaling loss or pneumatic valve deformation.

In order to solve the technical problem, the utility model provides an internal combustion engine air valve, including the valve disc, the valve disc bottom coats and is coated with first heat-resisting layer;

the first heat-resistant layer comprises a tungsten-copper alloy layer and an inorganic high-temperature-resistant anticorrosive coating, the tungsten-copper alloy layer wraps the outer wall of the valve disc, and the inorganic high-temperature-resistant anticorrosive coating wraps the outer side of the tungsten-copper alloy layer;

or the first heat resistant layer comprises a cermet hard alloy layer.

Preferably, the side surface and the bottom of the outer wall of the valve disc are provided with a plurality of heat conduction protrusions, and the tungsten-copper alloy layer or the metal ceramic hard alloy layer wraps the outer wall of the valve disc and is attached to the plurality of heat conduction protrusions.

Preferably, the plurality of heat conducting bumps are distributed in an array.

Preferably, the height of the heat conduction projection at the central position of the bottom of the valve disc is higher than that of the heat conduction projection close to the outer periphery of the bottom of the valve disc, and the top ends of the heat conduction projections at the bottom of the valve disc jointly form an upward convex arc-shaped surface contour.

Preferably, the surfaces of the plurality of heat conduction bumps are coated with a graphene coating layer.

Preferably, the valve disc top is equipped with the valve rod, the wall body inside of valve rod is equipped with the second heat-resistant layer, the second heat-resistant layer includes heat stabilizer layer, molybdenum alloy layer and silica layer, the outer wall of valve rod is equipped with high temperature resistant anticorrosive coating.

Preferably, the valve rod is internally provided with a cooling channel, and the valve disc is internally provided with a cooling chamber communicated with the cooling channel.

Preferably, a first air inlet channel and an air outlet channel are arranged in the cooling channel, the first air inlet channel and the first air outlet channel are arranged in parallel, and the first air inlet channel and the first air outlet channel extend to the cooling cavity and are communicated with the cooling cavity.

The utility model also provides an internal-combustion engine adopts foretell internal-combustion engine pneumatic valve.

The application provides an internal-combustion engine air valve and internal-combustion engine have following beneficial effect:

1. this application has set up first heat-resistant layer in the valve disc outside, utilizes the better heat conductivility of tungsten copper alloy layer to cool down the valve disc to improve its high temperature resistance, utilize inorganic high temperature resistant anticorrosive coating to improve the holistic corrosion resisting property of valve disc, in addition, still can improve the heat resistance and the life of valve disc through the extremely high hot hardness and the wearability in cermet carbide layer.

2. This application has set up a plurality of heat conduction lugs in valve disc outer wall side and bottom, utilizes the heat conduction lug to carry out quick heat conduction cooling to the valve disc to improve the cooling rate of valve disc.

3. This application has higher heat resistance's heat stabilizer layer, molybdenum alloy layer and silica layer through the inside heat stabilizer layer, the molybdenum alloy layer and the silica layer that set up of the wall body at the valve rod, can greatly improve the heat resistance of valve rod, avoid appearing because of the too high corrosion that arouses of temperature, scaling loss or gas valve warp scheduling problem.

4. This application has set up high temperature resistant anticorrosive coating at the outer wall of valve rod, and high temperature resistant anticorrosive coating has high temperature resistant, stand wear and tear and the good characteristics of corrosion resistance, can protect the valve rod not corroded effectively.

5. This application has set up cooling channel in the inside of valve rod, and in the use, the gas that the combustion chamber temperature is lower relatively can get into the cooling chamber through first intake duct and cool off the valve disc, prolongs the life of pneumatic valve, guarantees the work efficiency and the stability of internal-combustion engine.

6. The application provides a pair of internal-combustion engine has adopted foretell internal-combustion engine air valve, can promote the work efficiency of internal-combustion engine greatly, prolongs the life of internal-combustion engine.

Drawings

FIG. 1 is a schematic illustration of a valve configuration for an internal combustion engine provided herein;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is an enlarged view of a portion of FIG. 1 at B;

FIG. 4 is another enlarged partial view taken at B in FIG. 1;

FIG. 5 is a schematic diagram illustrating the structure of cooling passages and cooling chambers in an internal combustion engine valve provided herein;

FIG. 6 is a schematic diagram illustrating a first intake passage and an exhaust passage in an internal combustion engine valve according to the present disclosure.

Wherein: 10-valve rod, 101-heat stabilizer layer, 102-molybdenum alloy layer, 103-silicon dioxide layer, 104-high temperature resistant anticorrosive coating, 105-cooling channel, 106-cooling chamber, 107-first air inlet channel, 108-air outlet channel, 20-valve disc, 201-tungsten copper alloy layer, 202-inorganic high temperature resistant anticorrosive coating, 203-heat conducting lug and 204-metal ceramic hard alloy layer.

Detailed Description

In the following, the technical solutions in the embodiments will be clearly and completely described with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1 and 2, the present application provides an internal combustion engine air valve including a valve stem 10 and a valve disc 20, wherein the valve stem 10 is disposed on the top of the valve disc 20 and is integrally formed with the valve disc 20. A second heat-resistant layer is provided inside the wall body of the valve rod 10, and the second heat-resistant layer includes a heat stabilizer layer 101, a molybdenum alloy layer 102, and a silicon dioxide layer 103.

Among them, the most basic properties of the heat stabilizer are that the heat stabilizer has better heat resistance, weather resistance and processability. The silicon dioxide is insoluble in water and acid, has stable chemical properties, is commonly used for manufacturing refractory materials and has strong high-temperature resistance. The molybdenum alloy is a non-ferrous alloy formed by adding other elements into molybdenum as a matrix, and the main alloy elements comprise titanium, zirconium, hafnium, tungsten and rare earth elements. The titanium, zirconium and hafnium elements not only play a role in solid solution strengthening of the molybdenum alloy and keep the low-temperature plasticity of the alloy, but also can form a stable and dispersed carbide phase and improve the strength and the recrystallization temperature of the alloy. The molybdenum alloy has good heat conduction and electric conductivity and low expansion coefficient, has high strength at high temperature (1100-1650 ℃), and is easier to process than tungsten.

It can be seen that in the present invention, the heat resistance of the valve rod 10 can be greatly improved by providing the heat stabilizer layer 101, the molybdenum alloy layer 102, and the silica layer 103 in the wall body of the valve rod 10, and problems such as corrosion, burning, and deformation of the gas valve due to an excessively high temperature can be avoided.

Referring to fig. 2, the outer wall of the valve rod 10 is provided with a high temperature resistant anticorrosive coating 104, and the high temperature resistant anticorrosive coating 104 is made of paint dry powder and a composite binder. Specifically, the coating dry powder is a thermosetting dry powder coating; the composite binder consists of phosphate aqueous solution and silica sol, and the addition amount of the composite binder is 10-25% of the total weight of the coating dry powder. Thermosetting dry powder coatings are made of a thermosetting resin and a curing agent which, when heated, form an insoluble and hard coating. Because the resin used by the thermosetting dry powder coating has low polymerization degree, the thermosetting dry powder coating is flat after construction, has good decorative effect, better anticorrosion function and mechanical function, and can not soften the coating no matter the temperature is high. Therefore, the high-temperature-resistant anticorrosive coating 104 provided by the present application can effectively improve the high-temperature-resistant anticorrosive capability of the valve rod 10.

Referring to fig. 1 and 3, the bottom of the valve disc 20 is provided with a first heat-resistant layer, and in one embodiment, the first heat-resistant layer includes a tungsten-copper alloy layer 201 and an inorganic high-temperature-resistant anticorrosive coating 202, the tungsten-copper alloy layer 201 is coated on the outer wall of the valve disc 20, and the inorganic high-temperature-resistant anticorrosive coating 202 is coated on the outer side of the tungsten-copper alloy layer 201. Tungsten copper alloys are alloys of tungsten and copper. The copper content of the common alloy is 10-50%, and the alloy is prepared by a powder metallurgy method. The tungsten-copper alloy integrates the advantages of metal tungsten and copper, wherein the tungsten has high melting point (the melting point of the tungsten is 3410 ℃ and the melting point of the copper is 1080 ℃) and the density is high; copper has excellent heat-conducting property, and the tungsten-copper alloy (with the general component range of WCu 7-WCu 50) has uniform microstructure, high temperature resistance, high strength, better heat conductivity, high temperature strength and certain plasticity. The inorganic high-temperature resistant anticorrosive coating is prepared by taking an inorganic polymer as a base material and adding silicon carbide, boron nitride, zirconium oxide, metal oxide ultrafine powder, rare earth oxide ultrafine powder and the like, for example, ZM99-01A07 inorganic high-temperature resistant anticorrosive coating produced by Beijing Zema New technology company Limited, the highest heat-resistant temperature can reach 1750 ℃, and the coating has high hardness, scratch resistance, thermal shock resistance, strong binding force with a substrate and high anticorrosive performance. Therefore, this application utilizes the better heat conductivity of tungsten copper alloy layer 201 to cool down valve disc 20, has still set up inorganic high temperature resistant anticorrosive coating 202 simultaneously and has improved the holistic corrosion resisting property of valve disc 20.

Referring to FIG. 4, in another embodiment, the first refractory layer comprises a cermet hard alloy 204, and the cermet hard alloy layer 204 is wrapped around the outer wall of the valve disc 20. The cermet hard alloy layer is one kind of cermet, and is prepared with metal carbide, such as WC, TiC, TaC, etc. as base body and proper amount of metal powder, such as Co, Ni, Mo, etc. as adhesive. The metal ceramic hard alloy has extremely high hot hardness and wear resistance, and the hot hardness is as high as 900-1000 ℃ due to the carbide serving as a framework. Therefore, the heat resistance and the service life of the valve disk 20 can be effectively improved by providing the cermet hard alloy layer 204.

Referring to fig. 3 and 4, the side and the bottom of the outer wall of the valve disc 20 are provided with a plurality of heat conduction protrusions 203, and the tungsten-copper alloy layer 201 or the cermet hard alloy layer 204 wraps the outer wall of the valve disc 20 and is attached to the plurality of heat conduction protrusions 203. Preferably, the surfaces of the plurality of thermal conductive bumps 203 are coated with a graphene paint layer. The graphene has very good heat conduction performance, the heat conductivity coefficient of pure defect-free single-layer graphene is as high as 5300W/mK, the pure defect-free single-layer graphene is a carbon material with the highest heat conductivity coefficient at present, the pure defect-free single-layer graphene is higher than a single-wall carbon nanotube (3500W/mK) and a multi-wall carbon nanotube (3000W/mK), and when the pure defect-free single-layer graphene is used as a carrier, the heat conductivity coefficient can also reach 600W/mK. Therefore, this application utilizes a plurality of heat conduction lugs 203 can absorb the high temperature on valve disc 20 surface fast to reduce the temperature on valve disc 20 surface, improve cooling speed.

Specifically, the plurality of heat conduction projections 203 are distributed in an array, the height of the heat conduction projection 203 at the central position of the bottom of the valve disc 20 is higher than the height of the heat conduction projection 203 near the outer periphery of the bottom of the valve disc 20, and the top ends of the plurality of heat conduction projections 203 at the bottom of the valve disc 20 together form an upward convex arc-shaped surface profile. Through the design, the quick heat dissipation diffusion of the valve disc 20 can be facilitated, so that the heat dissipation efficiency is improved.

Referring to fig. 5, the valve stem 10 is provided with a cooling passage 105 inside, and the valve disc 20 is provided with a cooling chamber 106 inside to communicate with the cooling passage 105. In the working process, the gas with relatively low temperature outside the combustion chamber passes through the cooling channel 105 in the valve rod 10 and the cooling chamber 106 entering the valve disc 20 to cool the valve disc 20, so that the phenomena of corrosion, burning loss, deformation or gas leakage of the valve and the like on the surface of the gas valve are prevented, and the working efficiency of the internal combustion engine is ensured.

Referring to fig. 6, a first inlet 107 and an outlet 108 are provided in the cooling passage 105, the first inlet 107 and the outlet 108 are arranged in parallel, and the first inlet 107 and the outlet 108 extend to and communicate with the cooling chamber 106.

The application also provides an internal combustion engine, and the internal combustion engine air valve can greatly improve the working efficiency of the internal combustion engine and prolong the service life of the internal combustion engine.

The heat stabilizer, the molybdenum alloy, the silicon dioxide, the high-temperature-resistant anticorrosive coating, the tungsten-copper alloy, the inorganic high-temperature-resistant anticorrosive coating and the metal ceramic hard alloy which are mentioned in the application are all known materials, and the application applies the materials to the internal combustion engine air valve with the shape and the structure, and does not belong to the improvement on the materials.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims (9)

1. An internal combustion engine air valve comprises a valve disc, and is characterized in that the bottom of the valve disc is coated with a first heat-resistant layer;

the first heat-resistant layer comprises a tungsten-copper alloy layer and an inorganic high-temperature-resistant anticorrosive coating, the tungsten-copper alloy layer wraps the outer wall of the valve disc, and the inorganic high-temperature-resistant anticorrosive coating wraps the outer side of the tungsten-copper alloy layer;

or the first heat resistant layer comprises a cermet hard alloy layer.

2. The air valve for the internal combustion engine as claimed in claim 1, wherein a plurality of heat conduction protrusions are arranged on the side surface and the bottom of the outer wall of the valve disc, and the tungsten-copper alloy layer or the metal ceramic hard alloy layer wraps the outer wall of the valve disc and is attached to the plurality of heat conduction protrusions.

3. An internal combustion engine air valve as claimed in claim 2, wherein the plurality of thermally conductive bumps are arranged in an array.

4. The air valve for an internal combustion engine as claimed in claim 3, wherein the height of the heat conduction projection at the central position of the bottom of the valve disc is higher than that of the heat conduction projection near the outer periphery of the bottom of the valve disc, and the top ends of the plurality of heat conduction projections at the bottom of the valve disc together form an upwardly convex arc-shaped surface contour.

5. The internal combustion engine air valve as claimed in claim 4, wherein the surfaces of the plurality of heat conduction bumps are coated with a graphene coating layer.

6. The internal combustion engine gas valve as claimed in claim 1, characterized in that a valve rod is arranged on the top of the valve disc, a second heat-resistant layer is arranged inside the wall body of the valve rod, the second heat-resistant layer comprises a heat stabilizer layer, a molybdenum alloy layer and a silicon dioxide layer, and the outer wall of the valve rod is provided with a high-temperature-resistant anticorrosive coating.

7. An internal combustion engine valve as claimed in claim 6 wherein the valve stem defines cooling passages therein and the valve disc defines cooling chambers therein communicating with the cooling passages.

8. The valve as claimed in claim 7, wherein the cooling passage has a first inlet and outlet passage disposed in parallel, the first inlet and outlet passage extending to and communicating with the cooling chamber.

9. An internal combustion engine, characterized in that the engine valve according to claim 1 is used.

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