Hollow valve for engine

Abstract

The utility model belongs to the technical field of engine accessories, and particularly relates to a hollow valve for an engine, which comprises a valve retainer part integrated with a valve rod part, and a rod cavity for communicating the valve rod part with the valve retainer part, wherein the rod cavity is a variable-diameter cavity, the variable-diameter cavity is provided with at least two inner cavities with different diameters, and a funnel runner structure is formed at the joint of every two adjacent inner cavities with different diameters; during use, sodium axially moves in the rod cavity and generates vortexes at the same time. Due to the structure, the cooling device can be suitable for commercial vehicles, and the cooling effect and the service life of the engine are effectively guaranteed when the engine rotates at low and medium speeds.

Description

Technical Field

[0001] The utility model belongs to the technical field of engine accessories, and provides a hollow valve for an engine that can ensure the cooling effect at low and medium engine speeds and ensure the service life of the engine. Background Art

[0002] According to the layout of its cavity, the current hollow valves can be divided into rod hollow valves and rod-disc hollow valves.

[0003] The specific structure of the rod hollow valve is to connect the valve rod part and the disc part, and process a hole with an equal diameter. A certain amount of sodium is filled in the cavity. When the valve works, the sodium will carry part of the heat of the disc part to the rod part and dissipate heat through the conduit to reduce the valve temperature. This structure has a significant cooling effect at the second heat node of the valve, but the cooling effect at the first heat node is not significant.

[0004] The specific structure of the rod-disc hollow valve is that a cavity in the shape of a funnel is processed in the disc part and connected to the hole with an equal diameter in the rod part. A certain amount of sodium is filled in the cavity. When the valve works, the sodium will carry part of the heat of the disc part to the rod part and dissipate heat through the conduit to reduce the valve temperature. This structure has obvious cooling effects at both the first and second heat nodes of the valve.

[0005] The above-mentioned second heat node and first heat node of the valve respectively refer to the connection section between the valve rod part and the disc part and the valve disc end face.

[0006] The current hollow valves are mainly applied to car valves and can exert their excellent cooling effect only at high engine speeds, but cannot exert their cooling effect well at low and medium speeds. With the development of new energy technologies in recent years, some engines are only used to generate electricity for generators, and such engines no longer require high speeds. This results in poor cooling effect of the existing hollow valves and shortens the service life of the engine. Compared with cars, commercial vehicles (such as trucks, buses, ships, generators, etc.) pursue greater carrying capacity, and their engines often adopt a design of low speed and large torque, so the existing hollow valves are not suitable for commercial vehicles. Content of the Utility Model

[0007] In view of this, the purpose of the utility model is to provide a hollow valve for an engine that can ensure the cooling effect at low and medium engine speeds and ensure the service life of the engine.

[0008] To achieve the above purpose, the utility model provides the following technical solutions:

[0009] The utility model provides a hollow valve for an engine, which includes a valve disc portion integrated with a valve stem portion, and a rod cavity communicating the valve stem portion and the valve disc portion; wherein: the rod cavity is a variable-diameter cavity, and the variable-diameter cavity has at least two inner cavities with different diameters, and a conical funnel flow channel structure is formed at the connection of two adjacent inner cavities with different diameters;

[0010] During use, sodium generates a vortex while axially moving in the rod cavity.

[0011] To improve the heat dissipation speed, in the above solution, further: a disc cavity in a funnel shape towards the valve stem portion is provided on the valve disc portion, and the cavity communicates with the rod cavity.

[0012] To further improve the heat dissipation speed, in the above solution, further: the middle part of the rod cavity has a small inner cavity section, and the head and tail ends of the rod cavity have large inner cavity sections.

[0013] To ensure its assembly with the engine and seal sodium during operation, in the above solution, further: a solid rod integrated with the outer end of the valve stem portion is provided.

[0014] The beneficial effects of the utility model are as follows: Since the rod cavity is a variable-diameter cavity, a funnel flow channel structure is formed at the connection of two adjacent inner cavities with different diameters. During use, sodium generates a vortex while axially moving in the rod cavity, which not only improves the axial movement speed of sodium, but also enables sodium to absorb and dissipate heat more fully in the high-temperature area (the side of the valve disc portion: the heat-receiving part) and the low-temperature area (the side of the valve stem portion: the heat-dissipating part), ultimately improving the heat exchange efficiency. When the engine operates at low and medium speeds, it can still show excellent cooling effects. It can be applied to commercial vehicles, effectively ensuring the cooling effect of the engine at low and medium speeds and the service life of the engine.

[0015] Other advantages, objectives, and features of the utility model will be described to some extent in the subsequent description, and to some extent, they will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the utility model. The objectives and other advantages of the utility model can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the objectives, technical solutions, and advantages of the utility model clearer, the utility model will be described in detail preferably with reference to the accompanying drawings, where:

[0017] Figure 1 is a schematic structural diagram of the first embodiment of the utility model;

[0018] Figure 2 is Figure 1 a schematic diagram of the instantaneous valve closing structure of the illustrated embodiment;

[0019] Figure 3 is Figure 1 Schematic diagram of the instantaneous valve opening structure of the illustrated embodiment;

[0020] Figure 4 Schematic diagram of the structure of the second embodiment of the present utility model;

[0021] Figure 5 Schematic diagram of the structure of the third embodiment of the present utility model;

[0022] Figure 6 Schematic diagram of the structure of the fourth embodiment of the present utility model;

[0023] Reference numerals: 1, valve stem part; 2, valve disc part; 3, rod cavity; 4, disc cavity; 5, small inner cavity section; 6, large inner cavity section; 7, solid rod. Detailed implementation manners

[0024] The following uses specific specific examples to illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. The present utility model can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present utility model. It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present utility model in a schematic manner. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0025] Among them, the drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and should not be construed as a limitation to this patent; in order to better illustrate the embodiments of the present utility model, some components in the drawings will be omitted, enlarged or reduced, and do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. In addition, the present utility model may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0026] As Figures 1 to 6 shown, a hollow valve for an engine according to the present utility model includes a valve disc part 2 integrated with a valve stem part 1, and a rod cavity 3 connecting the valve stem part 1 and the valve disc part 2; wherein: the rod cavity 3 is a variable-diameter cavity, and the variable-diameter cavity has at least two inner cavities with different diameters, and a funnel flow channel structure is formed at the connection of two adjacent inner cavities with different diameters;

[0027] During use, sodium moves axially within the rod cavity 3 while generating vortices. In this embodiment, the variable-diameter cavity is composed of two inner cavities with different diameters, specifically a small inner cavity section 5 and a large inner cavity section 6. The position of the small inner cavity section 5 and the large inner cavity section 6 can be such that the small inner cavity section 5 is located above, or the small inner cavity section 5 is located below, or even the small inner cavity section 5 is located in the middle. When the small inner cavity section 5 is located above, the large inner cavity section 6 connected to it is located below. When the small inner cavity section 5 is located below, the large inner cavity section 6 connected to it is located above. When the small inner cavity section 5 is located in the middle, the large inner cavity sections 6 connected to it are located at both the upper and lower ends. Since the rod cavity 3 is a variable-diameter cavity, a funnel-shaped flow channel structure is formed at the connection between two adjacent inner cavities with different diameters. During use, sodium moves axially within the rod cavity 3 while generating vortices, which not only increases the axial movement speed of sodium but also allows sodium to absorb and dissipate heat more fully in the high-temperature area (the side of the valve disc part: the heated part) and the low-temperature area (the side of the valve stem part: the heat-dissipating part), ultimately improving the heat exchange efficiency and enabling the engine to still exhibit excellent cooling effects during low and medium-speed operation.

[0028] See the appendix Figures 1 to 4 , to improve the heat dissipation speed, in the above embodiment, further: a disc cavity 4 in the shape of a funnel is provided on the valve disc part 2 and faces the valve stem part 1, and this disc cavity 4 is connected to the rod cavity 3.

[0029] See the appendix Figures 1 to 3 , to further improve the heat dissipation speed, in the above embodiment, further: the middle part of the rod cavity 3 has a small inner cavity section 5, and the head and tail ends of the rod cavity 3 have large inner cavity sections 6. In this embodiment, the small inner cavity section 5 is connected to the large inner cavity sections 6 at both of its ends, and the diameters of the two large inner cavity sections 6 are the same.

[0030] To ensure its assembly with the engine and seal the sodium during operation, in the above solution, further: a solid rod 7 integrated with it is provided at the outer end of the valve stem part 1.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the present technical solution, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A hollow valve for an engine, comprising a valve disc portion (2) integrated with a valve stem portion (1), and a stem cavity (3) connecting the valve stem portion (1) and the valve disc portion (2); characterized in that: The rod cavity (3) is a variable diameter cavity having at least two inner cavities with different diameters, and the connection between two adjacent inner cavities with different diameters forms a conical funnel flow channel structure; When in use, the sodium generates a vortex while moving axially within the rod cavity (3).

2. The hollow engine valve according to claim 1, characterized in that: The valve disc portion (2) is provided with a disc cavity (4) which is funnel-shaped toward the valve stem portion (1), and the disc cavity (4) is communicated with the stem cavity (3).

3. The hollow engine valve according to claim 1 or 2, characterized in that: The middle part of the rod cavity (3) has a small inner cavity section (5), and the head and tail ends of the rod cavity (3) have large inner cavity sections (6).

4. The hollow engine valve according to claim 1 or 2, characterized in that: The outer end of the valve stem (1) is provided with a solid rod (7) integral therewith.

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