CN212272332U - Multi-metal structure valve - Google Patents

Abstract

The utility model provides a multi-metal structure valve, which consists of a valve head part and a valve rod part, wherein the valve head part comprises a valve disk part and a valve neck part, and the valve disk part comprises a disk end surface, a disk excircle and a disk conical surface; the valve head can be divided into a small disc and an outer ring according to the annular direction, the small disc and the outer ring are made of different metal materials and are tightly combined with each other; the outer circle of the disc, the conical surface of the disc and the part of the end surface of the disc are positioned on the outer circular ring. The utility model can respectively meet the requirements of wear resistance and corrosion resistance of the valve conical surface and the requirements of tensile strength, yield strength and fatigue strength of the valve neck in a high-temperature state, and has better working reliability; present common single metal overall material structure valve, bimetal friction welding structure valve, surface treatment valve and the cold bimetal valve of cavity sodium etc. can all adopt in the valve blank stage the technical scheme of the utility model.

Description

Multi-metal structure valve

Technical Field

The utility model relates to an engine valve.

Background

The four-stroke engine has been developed over a hundred years into an extremely wide range of power machines, and the valve is used as a key basic part for sealing an air inlet and an air outlet in the working process of the engine and is used for blocking an air flow channel and controlling the air exchange of the engine. The air inlet and outlet valves are developed from original single-metal integral structure valves to double-metal welding structure valves, single-metal or double-metal surfacing alloy valves, surface treatment valves, hollow sodium-cooled double-metal valves and the like (the structural type of the valves is referred to automobile industry standard QC/T469-2016 technical conditions of automobile engine valves).

The valves with different structures are suitable for different working conditions of the engine, for example, the low-load engine usually adopts the valve with a single metal integral structure or carries out chromium plating and nitriding surface treatment on the valve, thereby meeting the performance requirement of the engine and being beneficial to reducing the cost; the medium-load engine mostly adopts a bimetal welding structure valve and carries out chromium plating and nitriding surface treatment on the valve; for an engine with large conical surface abrasion strengthening degree, a single metal or double metal surfacing alloy valve is often adopted; the high-temperature high-rotation-speed engine usually adopts a hollow sodium-cooled bimetallic valve, for example, a cylinder internal direct injection turbocharging gasoline engine, and an exhaust valve of the high-temperature high-rotation-speed engine usually adopts a hollow sodium-cooled valve structure, so that the maximum working temperature of the valve is reduced, meanwhile, the working inertia force under the high-rotation-speed working condition can be reduced, and the performance requirement of the engine is met.

Along with the continuous improvement of the strengthening degree of the engine, the use working condition of the valve is more complex, the working condition is severe, the valve not only bears repeated impact load in high-temperature oxidation corrosive atmosphere, but also bears the combined action of thermal stress, conical surface internal stress, gas pressure during combustion and the like, the cooling condition is poor, the heat conductivity coefficient of the valve material is small, the valve also bears impact load, spring force and the like when being seated, and the working stress of the valve is complex.

The existing commonly used valve type can better solve the requirements on valve performance, reliability, service life and the like after the strengthening degree of the engine is improved, but also has other problems. Example 1, a bimetallic welding structure of a nickel-based superalloy is often adopted for a valve with a high working temperature to meet the tensile strength, the yield strength and the fatigue strength of the valve in a high-temperature state, but the wear resistance and the corrosion resistance of a conical surface of the nickel-based superalloy valve may not meet the requirements of the service life and the durability of an engine. Example 2, when the valve is welded by using the nickel-based superalloy bimetal, in order to further meet the requirements of wear resistance and corrosion resistance of the valve conical surface, the wear-resistant and corrosion-resistant alloy is frequently used in the industry by conical surface surfacing, that is, an annular groove is formed in the conical surface, then the wear-resistant and corrosion-resistant alloy is surfacing welded in the annular groove, after the conical surface adopts the surfacing alloy, the service life and the durability of the valve are greatly improved, but the problem of low reliability of the conical surface surfacing welding process exists, so that the conical surface surfacing structure is greatly limited in use, and the conical surface surfacing structure is not frequently used as long as the valve can meet the requirements of an engine by using.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a many metallic structure valve, this valve has constituted a new valve pattern, and its comprehensive properties is better than several traditional valve patterns.

In order to solve the technical problem, the utility model discloses a following technical scheme: a multi-metal structure valve comprises a valve head part and a valve rod part, wherein the valve head part comprises a valve disk part and a valve neck part, and the valve disk part comprises a disk end face, a disk outer circle and a disk conical face; the valve head can be divided into a small disc and an outer ring according to the annular direction, the small disc and the outer ring are made of different metal materials and are tightly combined with each other; the outer circle of the disc, the conical surface of the disc and the part of the end surface of the disc are positioned on the outer circular ring.

Preferably, a part of the valve neck is located on the outer ring.

Preferably, the annular joint surface between the small disc and the outer ring of the valve head is in a trumpet shape or a cylinder shape.

Preferably, the annular joint surface between the small disc and the outer ring of the valve head is in a horn shape, and the large opening end of the horn-shaped joint surface is located on the disc end surface of the valve disc part.

Preferably, the small disc of the valve head and the outer ring are welded into a whole by means of friction welding.

In one embodiment, the valve stem portion is formed by friction welding two different metal materials.

Compared with the prior art, the utility model has the following characteristics:

1) the utility model is the same as the valve with the conical surface surfacing, which can respectively meet the requirements of the wear resistance and the corrosion resistance of the conical surface of the valve and the requirements of the tensile strength, the yield strength and the fatigue strength of the neck of the valve in a high temperature state;

2) compared with the prior conical surface surfacing valve, the utility model has better working reliability;

3) the utility model discloses a technical commonality is stronger, and common single metal bulk material structure valve, bimetal friction weld structure valve, surface treatment valve and cavity sodium cold bimetal valve etc. can all adopt in the valve blank stage the technical scheme of the utility model.

Drawings

FIG. 1 is a schematic view of names of various parts of a valve;

FIG. 2 is a schematic view of a prior art monolithic valve;

FIG. 3 is a schematic view of a conventional bi-metal welded valve;

FIG. 4 is a schematic view of a conventional hollow sodium-cooled bimetallic valve;

FIG. 5 is a schematic view of the present invention applied to a "single metal integrated valve";

FIG. 6 is a schematic view of the present invention applied to a "dual metal welded structure valve";

FIG. 7 is a schematic view of the present invention applied to a "hollow sodium-cooled bimetallic valve" in the prior art;

the reference signs are: 1-small disc 2-external ring.

Detailed Description

In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise. In the description of the present invention, it should be noted that, unless otherwise specified and limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, or interconnected between two elements, directly or indirectly through intervening media, and the specific meaning of the terms may be understood by those skilled in the art according to their specific situation.

As shown in fig. 1, any type of valve is composed of a valve head portion and a valve stem portion, the valve head portion includes a valve disc portion and a valve neck portion, and the valve disc portion includes a disc end face, a disc outer circle and a disc conical face. Fig. 2 is a schematic diagram of a conventional single-metal integrated valve, and each part of the valve is made of the same metal material. Fig. 3 is a schematic view of a conventional bimetallic friction welding structure valve, wherein a valve rod part is formed by welding two different metal materials in a friction welding manner. Fig. 4 is a schematic diagram of a conventional hollow sodium-cooled bimetallic valve, in which a valve stem is formed by welding two different metal materials by friction welding.

The embodiment of the utility model provides a many metallic structure valve also includes the basic structure in figure 1. The many metallic structure valve that this embodiment provided has mainly improved the structure of valve head, and the valve head of the three kinds of valve patterns that fig. 2, 3, 4 show is a whole, consequently the utility model provides a many metallic structure valve all can directly use on above-mentioned three kinds of valve patterns.

As shown in fig. 5, the present invention is applied to the "single metal integral valve", and the partial section of the figure shows that the valve head can be divided into two parts, namely, a small disc 1 and an outer ring 2, according to the circumferential direction, the small disc 1 and the outer ring 2 are made of different metal materials and are tightly combined with each other, and the annular combination surface between the small disc 1 and the outer ring 2 is in the shape of a horn or a cylinder; wherein, the outer circle of the disc, the conical surface of the disc, the part of the end surface of the disc and the part of the neck of the air valve are all positioned on the outer circular ring 2. Preferably, the small disc 1 and the outer ring 2 of the valve head are welded into a whole by means of friction welding.

As shown in fig. 5, a combination surface of the small disc 1 and the outer ring 2 forms a combination angle α with a central axis of the valve, wherein when α =0 °, the combination surface is cylindrical, and when α ≠ 0 °, the combination surface is horn-shaped; when alpha is larger than 0 degree, the large opening end of the horn-shaped joint surface is positioned on the disc end surface of the valve disc part, the structure has optimal working reliability, and the risk of separation between the small disc 1 and the outer ring 2 can not occur; when the alpha is less than 0 degree, the method has better processing manufacturability and is suitable for medium and low engine load occasions.

Fig. 6 is the utility model discloses the application schematic diagram on "current bimetal welded structure valve", fig. 7 is the utility model discloses the application schematic diagram on "current cavity sodium cold bimetal valve". The valve disc structures in fig. 6 and 7 are substantially the same as those in fig. 5 and will not be described again.

The above-mentioned embodiment is the utility model discloses the implementation scheme of preferred, in addition, the utility model discloses can also realize by other modes, any obvious replacement is all within the protection scope of the utility model under the prerequisite that does not deviate from this technical scheme design.

In order to make it easier for those skilled in the art to understand the improvement of the present invention over the prior art, some drawings and descriptions of the present invention have been simplified, and in order to clarify, some other elements have been omitted from this document, those skilled in the art should recognize that these omitted elements may also constitute the content of the present invention.

Claims (6)

1. The utility model provides a many metallic structure valves, comprises valve head and valve stem portion, the valve head includes valve plate portion and valve neck, valve plate portion includes dish terminal surface, dish excircle and the dish conical surface, its characterized in that: the valve head can be divided into a small disc (1) and an outer ring (2) according to the annular direction, the small disc (1) and the outer ring (2) are made of different metal materials and are tightly combined with each other; the part of the disc excircle, the disc conical surface and the disc end surface is positioned on the outer circular ring (2).

2. The multi-metal structure valve according to claim 1, wherein: the part of the valve neck is positioned on the outer ring (2).

3. The multi-metal structure valve according to claim 1 or 2, wherein: the annular joint surface between the small disc (1) and the outer ring (2) of the valve head is in a horn shape or a cylinder shape.

4. The multi-metal structure valve according to claim 1 or 2, wherein: the annular joint surface between the small disc (1) and the outer circular ring (2) of the valve head is in a horn shape, and the large opening end of the horn-shaped joint surface is positioned on the disc end surface of the valve disc part.

5. The multi-metal structure valve according to claim 1 or 2, wherein: the small disc (1) and the outer ring (2) of the valve head are welded into a whole in a friction welding mode.

6. The multi-metal structure valve according to claim 1 or 2, wherein: the valve rod part is formed by welding two different metal materials in a friction welding mode.

Images