Valve structure, engine and carrier platform

Abstract

The utility model provides a valve structure, engine and carrying platform, valve structure includes: first valve head, second valve head and valve stem, first valve head fixedly arranged in valve stem axial one end, this end is the connecting end of valve stem, second valve head is covered in the outer periphery of first valve head and connecting end junction, first valve head has first heat conduction cavity inside, valve stem has axial heat conduction cavity inside, first heat conduction cavity is communicated with axial heat conduction cavity, is used for accommodating and circulating heat conduction medium, the space between the outer periphery of second valve head inside, first valve head and connecting end forms second heat conduction cavity, second heat conduction cavity is communicated with first heat conduction cavity, axial heat conduction cavity. The utility model solves the problem that the end heat dissipation effect of valve structure in the prior art is poor, and fatigue fracture easily occurs under high temperature and high stress environment, can effectively satisfy the use demand of current engine, is suitable for large-scale popularization and use.

Description

Technical Field

[0001] This utility model relates to the field of automotive engine technology, and more specifically, to a valve structure, an engine, and a transport platform. Background Technology

[0002] Currently, in the field of automotive engine technology, especially for turbocharged engines, the heat resistance and fatigue strength of valves (exhaust valves and intake valves) are key factors in ensuring stable engine operation. In existing traditional valve structure designs, in order to balance fatigue strength and cost under high-temperature environments, valves typically consist of two parts: a head and a stem. The head is made of a metal material (such as steel) that can withstand the impact of high temperatures in the combustion chamber (typically up to 2000°C), while the stem can be made of a metal material with poorer temperature resistance, but lower cost and moderate hardness, which can effectively resist the high stress generated when the rocker arm contacts the valve.

[0003] However, the existing valve structure design has several technical problems, mainly in the following aspects: 1. Overlap of high-temperature and high-stress areas: During engine operation, the valve end (e.g., the exhaust valve end) often comes into contact with high-temperature gases and exhaust gases. If heat dissipation is not timely, a high-temperature area can easily form. At the same time, when the valve finishes opening and impacts the valve seat, the same area, due to its thinner wall thickness and lower section coefficient, bears the high stress brought by the valve seating force. The superposition of high temperature and high stress makes this area a relatively weak part of the valve, prone to fatigue fracture; 2. Material cost and processing difficulty: To improve the high-temperature fatigue resistance of the valve, precious metals such as Ni are usually added to the material. These materials are not only expensive, but also have poor machinability, increasing the manufacturing cost and difficulty of the exhaust valve.

[0004] Therefore, the fatigue fracture problem of valve structure in the existing technology under high temperature and high stress environment has not been effectively solved. At the same time, material cost and processing difficulty are also factors that restrict the improvement of valve performance. Utility Model Content

[0005] This invention provides a valve structure, an engine, and a transport platform to at least solve the problem of poor end heat dissipation in the valve structure of the prior art, which makes it prone to fatigue fracture under high temperature and high stress environments.

[0006] To address the aforementioned problems, according to one aspect of this utility model, a valve structure is provided, comprising: a first valve head, a second valve head, and a valve stem. The first valve head is fixedly disposed at one axial end of the valve stem, which is the connecting end of the valve stem. One axial end of the second valve head is fixedly disposed on the first valve head, and the other axial end is fixedly disposed on the valve stem. The second valve head covers the outer periphery of the connection between the first valve head and the connecting end. The first valve head has a first heat-conducting cavity inside, and the valve stem has an axial heat-conducting cavity inside. The first heat-conducting cavity and the axial heat-conducting cavity are connected to each other for containing and circulating a heat-conducting medium. The space between the interior of the second valve head and the outer periphery of the first valve head and the connecting end forms a second heat-conducting cavity. The second heat-conducting cavity is connected to the first heat-conducting cavity and the axial heat-conducting cavity. The heat-conducting medium flows between the first heat-conducting cavity, the axial heat-conducting cavity, and the second heat-conducting cavity to conduct heat from the first valve head, the second valve head, and the connecting end to the end of the valve stem away from the connecting end.

[0007] Furthermore, the first valve head also has a first hole, which is connected to the first heat conduction cavity and the second heat conduction cavity respectively; the valve stem also has a second hole, which is connected to the axial heat conduction cavity and the second heat conduction cavity respectively; wherein, the first hole and the second hole are respectively spaced apart from the connection point between the first valve head and the connecting end.

[0008] Furthermore, there are multiple first holes, which are spaced apart circumferentially along the first valve head; there are also multiple second holes, which are spaced apart circumferentially along the valve stem; wherein, the direction along the axial direction of the valve stem and pointing towards the first valve head is designated as the first direction, and the direction along the axial direction of the valve stem and away from the first direction is designated as the second direction. When the valve stem moves along the first direction, the heat-conducting medium in the first heat-conducting cavity enters the second heat-conducting cavity through the first hole; when the valve stem moves along the second direction, the heat-conducting medium in the second heat-conducting cavity enters the first heat-conducting cavity through the first hole, the heat-conducting medium in the first heat-conducting cavity flows into the axial heat-conducting cavity along the axial direction of the valve stem, and the heat-conducting medium in the axial heat-conducting cavity flows towards the end of the valve stem away from the connecting end.

[0009] Furthermore, the central axis of the axial heat-guiding cavity coincides with the central axis of the valve stem, the central axis of the first hole is perpendicular to the central axis of the axial heat-guiding cavity, and the central axis of the second hole has an angle with the central axis of the axial heat-guiding cavity.

[0010] Furthermore, the first valve head and valve stem are integrally formed; and / or, one axial end of the second valve head is fixedly mounted on the first valve head by welding, and the other axial end is fixedly mounted on the valve stem by welding to seal the second heat conduction cavity; the outer periphery of the first valve head has a positioning ring groove, and one axial end of the second valve head is limited and matched with the positioning ring groove.

[0011] Furthermore, the volume of the second heat-conducting cavity is larger than that of the first heat-conducting cavity; and / or, the first heat-conducting cavity is formed by drilling a hole in the first valve head.

[0012] Furthermore, the distance in the axial direction of the valve stem from the connection point between the second valve head and the valve stem relative to the connection point between the first valve head and the valve stem is greater than or equal to 10 mm; and / or, the distance in the axial direction of the valve stem from the connection point between the second valve head and the first valve head relative to the connection point between the first valve head and the valve stem is greater than or equal to 10 mm.

[0013] Furthermore, the first valve head is made of austenitic steel, the second valve head is made of austenitic steel or martensitic steel; the valve stem is made of martensitic steel; and / or, the heat transfer medium is made of sodium metal or sodium alloy.

[0014] According to another aspect of the present invention, an engine is provided, the engine including the above-described valve structure, the valve structure being used as an exhaust valve or an intake valve of the engine.

[0015] According to another aspect of the present invention, a transport platform is provided, the transport platform including the engine described above.

[0016] Applying the technical solution of this utility model, this utility model provides a valve structure, including: a first valve head, a second valve head, and a valve stem. The first valve head is fixedly disposed at one axial end of the valve stem, which is the connecting end of the valve stem. One axial end of the second valve head is fixedly disposed on the first valve head, and the other axial end is fixedly disposed on the valve stem. The second valve head covers the outer periphery of the connection between the first valve head and the connecting end. The first valve head has a first heat-conducting cavity inside, and the valve stem has an axial heat-conducting cavity inside. The first heat-conducting cavity and the axial heat-conducting cavity are connected to each other for containing and circulating heat-conducting medium. The space between the interior of the second valve head, the first valve head, and the outer periphery of the connecting end forms a second heat-conducting cavity. The second heat-conducting cavity is connected to the first heat-conducting cavity and the axial heat-conducting cavity. The heat-conducting medium flows between the first heat-conducting cavity, the axial heat-conducting cavity, and the second heat-conducting cavity to conduct heat from the first valve head, the second valve head, and the connecting end to the end of the valve stem away from the connecting end.

[0017] This invention strengthens the weaker parts of the valve structure by covering the outer periphery of the connection between the first valve head and the connecting end with a second valve head, thereby enhancing the overall rigidity and fatigue resistance of the valve structure. By connecting the second heat-conducting cavity, the first heat-conducting cavity, and the axial heat-conducting cavity, the heat transfer medium can efficiently conduct heat from the first valve head, the second valve head, and the connecting end to the end of the valve stem furthest from the connecting end, thus improving heat transfer efficiency and facilitating subsequent overall cooling of the valve structure. This invention effectively improves the heat dissipation performance of the valve structure, not only increasing the efficiency of heat transfer but also distributing heat evenly, preventing localized overheating. This significantly reduces the local maximum temperature, decreases material fatigue, and extends the service life of the valve structure. Furthermore, this design reduces the need for precious metal materials, lowers raw material costs, and improves the manufacturability and manufacturing efficiency of the valves, providing a strong guarantee for the reliable operation of subsequent engines. This invention features a simple structure, controllable and low material costs, and is easy to assemble and maintain. It solves the problem of poor end heat dissipation in existing valve structures, which easily leads to fatigue fracture under high temperature and high stress environments. It effectively meets the current engine usage requirements and is suitable for large-scale promotion and use. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0019] Figure 1 A schematic diagram of the internal structure of the valve structure provided in an embodiment of the present invention is shown;

[0020] Figure 2 A schematic diagram of the external structure of the first valve head and valve stem provided in an embodiment of the present invention is shown;

[0021] Figure 3 A schematic diagram of the external structure of the first valve head and valve stem provided in an embodiment of the present invention is shown at another angle;

[0022] Figure 4 A schematic diagram of the external structure of the second valve head provided in an embodiment of the present invention is shown.

[0023] The above figures include the following reference numerals:

[0024] 10. First valve head; 11. First heat conduction cavity; 12. First hole; 13. Positioning ring groove;

[0025] 20. Second valve head; 21. Second heat conduction cavity;

[0026] 30. Valve stem; 31. Connecting end; 32. Axial heat-guiding cavity; 33. Second hole. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0028] like Figures 1 to 4 As shown, an embodiment of this utility model provides a valve structure, including: a first valve head 10, a second valve head 20, and a valve stem 30. The first valve head 10 is fixedly disposed at one axial end of the valve stem 30, which is the connecting end 31 of the valve stem 30. One axial end of the second valve head 20 is fixedly disposed on the first valve head 10, and the other axial end is fixedly disposed on the valve stem 30. The second valve head 20 covers the outer periphery of the connection between the first valve head 10 and the connecting end 31. The first valve head 10 has a first heat-conducting cavity 11 inside, and the valve stem 30 has a first heat-conducting cavity 11 inside. It has an axial heat conduction cavity 32, and a first heat conduction cavity 11 is connected to the axial heat conduction cavity 32 for containing and circulating heat conduction medium; the space between the inside of the second valve head 20 and the outer periphery of the first valve head 10 and the connecting end 31 forms a second heat conduction cavity 21, which is connected to the first heat conduction cavity 11 and the axial heat conduction cavity 32; the heat conduction medium flows between the first heat conduction cavity 11, the axial heat conduction cavity 32 and the second heat conduction cavity 21 to conduct the heat of the first valve head 10, the second valve head 20 and the connecting end 31 to the end of the valve stem 30 away from the connecting end 31.

[0029] This invention strengthens the weakest part of the valve structure by providing a second valve head 20 that covers the outer periphery of the connection between the first valve head 10 and the connecting end 31, thereby enhancing the overall rigidity and fatigue resistance of the valve structure. By connecting the second heat-conducting cavity 21, the first heat-conducting cavity 11, and the axial heat-conducting cavity 32, the heat transfer medium can efficiently conduct heat from the first valve head 10, the second valve head 20, and the connecting end 31 to the end of the valve stem 30 furthest from the connecting end 31, thus improving heat transfer efficiency and facilitating subsequent overall cooling of the valve structure. This invention effectively improves the heat dissipation performance of the valve structure, not only increasing the efficiency of heat transfer but also ensuring uniform heat distribution. This design effectively reduces heat dissipation, preventing localized overheating and significantly lowering the maximum local temperature, thus reducing material fatigue and extending the service life of the valve structure. Furthermore, this design reduces the need for precious metal materials, lowers raw material costs, and improves the manufacturability and manufacturing efficiency of the valves, providing a strong guarantee for the reliable operation of subsequent engines. The design is simple in structure, uses controllable and inexpensive materials, and is easy to assemble and maintain. It solves the problem of poor end heat dissipation in existing valve structures, which can easily lead to fatigue fracture under high temperature and high stress environments. This design effectively meets the current engine usage requirements and is suitable for large-scale application.

[0030] like Figure 1 and Figure 2 As shown, the first valve head 10 also has a first hole 12, which is connected to the first heat conduction cavity 11 and the second heat conduction cavity 21 respectively; the valve stem 30 also has a second hole 33, which is connected to the axial heat conduction cavity 32 and the second heat conduction cavity 21 respectively; wherein, the first hole 12 and the second hole 33 are respectively spaced apart from the connection point between the first valve head 10 and the connecting end 31.

[0031] By setting the first hole 12 and the second hole 33 at intervals between the connection point of the first valve head 10 and the connecting end 31, the strength reduction at the connecting end 31 due to the opening is avoided, thus ensuring the stability and reliability of the connecting end 31. This setting also ensures the efficient circulation of the heat transfer medium inside the valve structure, improving heat transfer efficiency. The above design enables the valve structure to respond quickly and dissipate heat in a timely manner during engine operation, avoiding local overheating. Practical application scenarios include high-load, high-speed engines, and it is particularly suitable for operating environments that require frequent opening and closing of valves. During use, when the engine is running, the up and down movement of the valve stem 30 causes the heat transfer medium to flow through the first hole 12 and the second hole 33 between the first heat transfer cavity 11, the axial heat transfer cavity 32, and the second heat transfer cavity 21, forming a dynamic heat dissipation system.

[0032] like Figure 1 and Figure 2As shown, there are multiple first holes 12, which are spaced apart circumferentially along the first valve head 10; there are multiple second holes 33, which are spaced apart circumferentially along the valve stem 30; wherein, the direction along the axial direction of the valve stem 30 and pointing towards the first valve head 10 is defined as the first direction, and the direction along the axial direction of the valve stem 30 and away from the first direction is defined as the second direction. When the valve stem 30 moves along the first direction, the heat-conducting medium in the first heat-conducting cavity 11 enters the second heat-conducting cavity 21 through the first hole 12; when the valve stem 30 moves along the second direction, the heat-conducting medium in the second heat-conducting cavity 21 enters the first heat-conducting cavity 11 through the first hole 12, the heat-conducting medium in the first heat-conducting cavity 11 flows into the axial heat-conducting cavity 32 along the axial direction of the valve stem 30, and the heat-conducting medium in the axial heat-conducting cavity 32 flows towards the end of the valve stem 30 away from the connecting end 31.

[0033] By setting multiple holes in the first valve head 10 and valve stem 30, the flow path of the heat transfer medium can be increased, and the heat dissipation efficiency can be improved. This valve structure can achieve a more uniform temperature distribution during engine operation, reduce thermal stress, and improve overall performance. Practical applications include high-power output engines such as high-performance automobiles and heavy machinery, and it is particularly suitable for equipment that needs to maintain stable operation under extreme conditions. In actual operation, when the engine is running, the movement of the valve stem 30 causes the heat transfer medium to circulate between the first heat transfer cavity 11, the axial heat transfer cavity 32, and the second heat transfer cavity 21, thereby achieving dynamic thermal balance.

[0034] like Figure 1 and Figure 2 As shown, the central axis of the axial heat-conducting cavity 32 coincides with the central axis of the valve stem 30, the central axis of the first hole 12 is perpendicular to the central axis of the axial heat-conducting cavity 32, and the central axis of the second hole 33 has an angle with the central axis of the axial heat-conducting cavity 32.

[0035] This perforated layout design ensures the uniform distribution of the heat transfer medium within the valve structure, avoiding the formation of heat conduction dead zones. This design further improves the heat transfer efficiency of the valve structure and significantly reduces the risk of local overheating. Practical applications include engines that need to operate for extended periods in high-temperature environments, such as industrial engines and aero engines. During operation, the heat transfer medium forms a multi-path circulation flow between the first valve head 10, valve stem 30, and second valve head 20, ensuring that heat can be uniformly transferred from the high-temperature region to the low-temperature region.

[0036] like Figure 1 , Figure 2 and Figure 3As shown, the first valve head 10 and the valve stem 30 are integrally formed; and / or, one axial end of the second valve head 20 is fixedly mounted on the first valve head 10 by welding, and the other axial end is fixedly mounted on the valve stem 30 by welding to seal the second heat-conducting cavity 21; as shown Figure 2 and Figure 4 As shown, the outer periphery of the first valve head 10 has a positioning ring groove 13, and one axial end of the second valve head 20 is limited and matched with the positioning ring groove 13.

[0037] The one-piece molding design and welded seals enhance the overall strength and sealing performance of the valve structure, reducing energy loss during heat conduction. This design also significantly improves the heat resistance and fatigue strength of the valve structure, extending its service life. Practical applications include high-performance engines and turbocharged engines, and it is particularly suitable for engines that need to operate stably under high temperature and high stress environments. Specifically, during engine operation, the valve structure can withstand high temperature impacts and high stresses. Through the one-piece molding design and welded seals, the heat transfer medium circulates internally, achieving efficient heat dissipation.

[0038] Specifically, the volume of the second heat-conducting cavity 21 is larger than the volume of the first heat-conducting cavity 11; and / or, the first heat-conducting cavity 11 is formed by drilling holes in the first valve head 10.

[0039] This volumetric design and manufacturing method ensures that the valve structure has a larger heat capacity and a more flexible heat conduction path during engine operation. This configuration allows the valve structure to more effectively absorb and disperse heat, reducing localized overheating and improving overall heat dissipation efficiency. Practical applications include engines that require frequent opening and closing of valves in high-temperature environments, such as turbocharged engines and high-performance racing engines. During engine operation, the second heat-conducting cavity 21 absorbs more heat, achieving uniform heat distribution and effective conduction through its connection with the first heat-conducting cavity 11.

[0040] like Figure 1 and Figure 2 As shown, the distance between the connection end 31 of the second valve head 20 and the valve stem 30 and the connection point of the first valve head 10 and the connection end 31 in the axial direction of the valve stem 30 is greater than or equal to 10 mm; and / or, the distance between the connection end 31 of the second valve head 20 and the first valve head 10 and the connection point of the first valve head 10 and the connection end 31 in the axial direction of the valve stem 30 is greater than or equal to 10 mm.

[0041] This design allows the second valve head 20 to effectively cover the high-temperature and high-stress areas of the valve structure, providing sufficient buffer space and strength to reduce the direct impact of thermal stress on the connection end 31 when subjected to high temperatures and stresses. This valve structure also ensures that the connection end 31 maintains good mechanical properties during engine operation, reducing the risk of breakage. Practical applications include engines that operate under extreme conditions, such as high-performance automotive engines and aircraft engines. During engine operation, the connection end 31 of the valve structure, protected by the second valve head 20, can withstand high temperatures and stresses. Sufficient distance design reduces the direct impact of thermal stress on the connection end 31, ensuring its stability and reliability.

[0042] Optionally, the first valve head 10 is made of austenitic steel, the second valve head 20 is made of austenitic steel or martensitic steel; the valve stem 30 is made of martensitic steel; and / or, the heat transfer medium is made of sodium metal or sodium alloy.

[0043] By selecting the aforementioned materials, and while effectively controlling costs, the valve structure can be ensured to possess excellent heat resistance and fatigue strength under high-temperature conditions. Simultaneously, efficient heat transfer is achieved through the use of sodium metal or sodium alloys as the heat transfer medium. This design enables the valve structure to withstand high-temperature shocks under extreme conditions, and the high thermal conductivity of sodium metal or sodium alloys facilitates rapid heat dissipation, improving overall performance. Practical applications include engines requiring stable operation in high-temperature environments, such as turbocharged engines and high-performance racing engines. During actual engine operation, the valve structure materials withstand high temperatures and stresses, and the efficient heat transfer of sodium metal or sodium alloys enables rapid heat absorption and uniform distribution, enhancing engine stability and reliability.

[0044] In a specific embodiment of this utility model, the processing sequence of the valve structure is as follows: First, the first valve head 10 and valve stem 30 are forged, so that the first valve head 10 is forged and formed by drilling to form a first heat-conducting cavity 11; Second, multiple first holes 12 and multiple second holes 33 are drilled; Third, sodium is filled into the first heat-conducting cavity 11, and the second valve head 20 is positioned by the positioning ring groove 13 on the first valve head 10, and then the first valve head 10 and the second valve head 20 are welded and fixed; Fourth, the valve stem 30 is machined.

[0045] This utility model also provides an engine, which includes the above-mentioned valve structure, and the valve structure is used as the exhaust valve or intake valve of the engine.

[0046] The engine proposed in this invention has a valve structure that can withstand high temperatures and high stresses during operation. Through efficient heat conduction by the heat-conducting medium, it achieves rapid absorption and uniform distribution of heat, thereby improving the engine's operational stability and reliability.

[0047] This utility model also provides a transport platform, which includes the aforementioned engine.

[0048] The specific working process and principle of one embodiment of this utility model will now be described in detail as follows:

[0049] The high-stress area is located 10-20 mm from the valve end (i.e., the connection between the first valve head 10 and the connecting end 31). The material thickness and cross-sectional design of this high-stress area are different from the rest of the valve through the cooperation of the first valve head 10 and the second valve head 20, thus meeting the strength and rigidity requirements. Pure metallic sodium is used as the heat transfer medium. The metallic sodium becomes liquid at 98°C and flows to fill the first heat transfer cavity 11, the second heat transfer cavity 21, and the axial heat transfer cavity 32. It can flow bidirectionally when the valve structure moves axially, generating a liquid level difference and transferring heat. The bidirectional flow of metallic sodium during the movement of the valve structure not only increases the efficiency of heat transfer but also distributes heat evenly, avoiding local overheating. This significantly reduces the maximum temperature of the valve, reduces material fatigue, and extends the service life of the exhaust valve.

[0050] When metallic sodium melts into a liquid, the heat-conducting medium in the first heat-conducting cavity 11 enters the second heat-conducting cavity 21 through the first hole 12 when the valve stem 30 moves in the first direction. When the valve stem 30 moves in the second direction, the heat-conducting medium in the second heat-conducting cavity 21 enters the first heat-conducting cavity 11 through the first hole 12. The heat-conducting medium in the first heat-conducting cavity 11 flows into the axial heat-conducting cavity 32 along the axial direction of the valve stem 30. The heat-conducting medium in the axial heat-conducting cavity 32 flows towards the end of the valve stem 30 away from the connecting end 31. Since the volume of the second heat-conducting cavity 21 is larger than that of the first heat-conducting cavity 11, there is more metallic sodium in the second heat-conducting cavity 21, and the second valve head 20 is thinner. Therefore, it can better cool the back of the valve structure and reduce the maximum temperature of the valve.

[0051] In summary, this invention provides a valve structure, engine, and carrier platform. By providing a second valve head 20 covering the outer periphery of the connection between the first valve head 10 and the connecting end 31, this invention further strengthens the vulnerable parts of the valve structure, enhancing the overall rigidity and fatigue resistance of the valve structure. By connecting the second heat-conducting cavity 21, the first heat-conducting cavity 11, and the axial heat-conducting cavity 32, the heat transfer medium can efficiently conduct heat from the first valve head 10, the second valve head 20, and the connecting end 31 to the end of the valve stem 30 away from the connecting end 31, thereby improving heat transfer efficiency and facilitating subsequent overall cooling of the valve structure. This invention effectively improves the heat dissipation performance of the valve structure, not only increasing heat transfer efficiency but also improving the overall cooling capacity of the valve structure. The efficiency of heat transfer is improved, and heat can be evenly distributed to avoid local overheating, thereby significantly reducing the local maximum temperature, reducing material fatigue, and extending the service life of the valve structure. In addition, the design proposed in this invention can reduce the demand for precious metal materials, reduce raw material costs, improve the machinability and manufacturing efficiency of the valve, and provide a strong guarantee for the reliable operation of the engine. This invention has a simple structure, controllable and low material costs, and is easy to assemble and maintain. This invention solves the problem of poor end heat dissipation of the valve structure in the prior art, which makes it prone to fatigue fracture under high temperature and high stress environments. It can effectively meet the current engine usage requirements and is suitable for large-scale promotion and use.

[0052] The technical features of the embodiments described above can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered to be within the scope of this specification.

[0053] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0054] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0055] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0056] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0057] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0058] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A valve structure, characterized in that, include: The valve consists of a first valve head (10), a second valve head (20), and a valve stem (30). The first valve head (10) is fixedly disposed at one axial end of the valve stem (30), which is the connecting end (31) of the valve stem (30). One axial end of the second valve head (20) is fixedly disposed on the first valve head (10), and the other axial end is fixedly disposed on the valve stem (30). The second valve head (20) covers the outer periphery of the connection between the first valve head (10) and the connecting end (31). The first valve head (10) has a first heat-conducting cavity (11) inside, and the valve stem (30) has an axial heat-conducting cavity (32) inside. The first heat-conducting cavity (11) is connected to the axial heat-conducting cavity (32) for containing and circulating heat-conducting medium. The space between the interior of the second valve head (20), the first valve head (10), and the outer periphery of the connecting end (31) forms a second heat-conducting cavity (21). The second heat-conducting cavity (21) is connected to the first heat-conducting cavity (11) and the axial heat-conducting cavity (32). The heat-conducting medium flows between the first heat-conducting cavity (11), the axial heat-conducting cavity (32), and the second heat-conducting cavity (21) to conduct the heat from the first valve head (10), the second valve head (20), and the connecting end (31) to the end of the valve stem (30) away from the connecting end (31).

2. The valve structure according to claim 1, characterized in that, The first valve head (10) also has a first hole (12), which is connected to the first heat-conducting cavity (11) and the second heat-conducting cavity (21) respectively; the valve stem (30) also has a second hole (33), which is connected to the axial heat-conducting cavity (32) and the second heat-conducting cavity (21) respectively; wherein, the first hole (12) and the second hole (33) are respectively spaced apart from the connection point between the first valve head (10) and the connecting end (31).

3. The valve structure according to claim 2, characterized in that, There are multiple first holes (12), which are spaced apart circumferentially along the first valve head (10); there are multiple second holes (33), which are spaced apart circumferentially along the valve stem (30); wherein, the direction along the axial direction of the valve stem (30) and pointing towards the first valve head (10) is defined as the first direction, and the direction along the axial direction of the valve stem (30) and away from the first direction is defined as the second direction. When the valve stem (30) moves along the first direction, the first heat-conducting cavity (11) contains... The heat-conducting medium enters the second heat-conducting cavity (21) through the first hole (12); when the valve stem (30) moves along the second direction, the heat-conducting medium in the second heat-conducting cavity (21) enters the first heat-conducting cavity (11) through the first hole (12), the heat-conducting medium in the first heat-conducting cavity (11) flows into the axial heat-conducting cavity (32) along the axial direction of the valve stem (30), and the heat-conducting medium in the axial heat-conducting cavity (32) flows along the axial heat-conducting cavity (32) towards the end of the valve stem (30) away from the connecting end (31).

4. The valve structure according to claim 2, characterized in that, The central axis of the axial heat-conducting cavity (32) coincides with the central axis of the valve stem (30), and the central axis of the first hole (12) is perpendicular to the central axis of the axial heat-conducting cavity (32); the central axis of the second hole (33) has an angle with the central axis of the axial heat-conducting cavity (32).

5. The valve structure according to claim 1, characterized in that, The first valve head (10) and the valve stem (30) are integrally formed; and / or, one axial end of the second valve head (20) is fixedly mounted on the first valve head (10) by welding, and the other axial end is fixedly mounted on the valve stem (30) by welding to seal the second heat conduction cavity (21); the outer periphery of the first valve head (10) has a positioning ring groove (13), and one axial end of the second valve head (20) is limited to the positioning ring groove (13).

6. The valve structure according to claim 1, characterized in that, The volume of the second heat-conducting cavity (21) is larger than the volume of the first heat-conducting cavity (11); and / or, the first heat-conducting cavity (11) is formed by drilling a hole in the first valve head (10).

7. The valve structure according to claim 1, characterized in that, The distance between the connection end (31) of the second valve head (20) and the valve stem (30) relative to the connection point of the first valve head (10) and the connection end (31) on the axial direction of the valve stem (30) is greater than or equal to 10 mm; and / or, the distance between the connection end (31) of the second valve head (20) and the first valve head (10) relative to the connection point of the first valve head (10) and the connection end (31) on the axial direction of the valve stem (30) is greater than or equal to 10 mm.

8. The valve structure according to claim 1, characterized in that, The first valve head (10) is made of austenitic steel, the second valve head (20) is made of austenitic steel or martensitic steel; the valve stem (30) is made of martensitic steel; and / or, the heat-conducting medium is made of sodium metal or sodium alloy.

9. An engine, characterized in that, The engine includes the valve structure according to any one of claims 1 to 8, the valve structure being used as an exhaust valve or an intake valve of the engine.

10. A transport platform, characterized in that, The transport platform includes the engine as described in claim 9.

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