Valve guide pipe
By setting the heat insulation layer on the outer peripheral surface of the first end of the valve conduit and the wear-resistant layer on the inner surface, the wear resistance and deformation problems of the valve conduit in high temperature environments are solved, and the wear resistance is improved and the service life is extended, and maintenance costs are reduced.
Patent Information
- Application Number
- CN202422549718.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-22
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-10-22
AI Technical Summary
How to improve the wear resistance of the valve conduit and slow down the deformation of the bottom of the valve conduit, especially in high temperature environments, the prior art is difficult to effectively solve this problem.
A heat insulation layer is provided on the outer peripheral surface of the first end of the valve conduit, and an wear-resistant layer is provided on the inner surfaces of the first and second ends respectively. The adhesion between the layers is improved by the transition connection layer, and a ceramic coating material such as a MCrAlY layer and a modified material layer are used to enhance wear resistance and heat insulation.
Effectively reduce the temperature at the first end of the valve conduit, slow down deformation, improve the wear resistance of the inner surface, extend the service life, reduce maintenance and replacement frequency, and reduce costs.
Smart Images
Figure CN223119985U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of engines, and particularly relates to a valve guide. Background Art
[0002] The valve train of an engine mainly includes a valve and a valve guide. The valve guide is used to guide the valve so that the valve can reciprocate relative to the combustion chamber of the engine, suck air into the combustion chamber, or discharge the exhaust gas after combustion in the combustion chamber.
[0003] With the increasingly harsh working environment of the valve guide, how to improve the wear resistance of the valve guide and slow down the deformation at the bottom of the valve guide has become an important research topic.
[0004] In the thermal protection coating system, the MCrAlY (M represents Co, Ni or a combination of both) coating, as an antioxidant and anti-thermal corrosion coating and a bonding layer in the thermal barrier coating system, has been widely used due to its excellent anti-thermal corrosion performance and flexible selectivity. Summary of the Utility Model
[0005] The utility model provides a valve guide, which can improve the wear resistance of the valve guide and slow down the deformation at the bottom of the valve guide.
[0006] To achieve the above object, the utility model provides the following technical solutions:
[0007] A valve guide includes a valve guide body. The valve guide body includes a first end and a second end. Among them, the first end is used to face the combustion chamber of the engine. An insulating layer is provided on the outer peripheral surface of the first end, a first wear-resistant layer is provided on the inner surface of the first end, and a second wear-resistant layer is provided on the inner surface of the second end.
[0008] Optionally, a first transition connection layer is provided on the outer peripheral surface of the first end, and the insulating layer is connected to the outer peripheral surface of the first end through the first transition connection layer.
[0009] Optionally, the first transition connection layer includes an MCrAlY layer and / or a modified material layer of MCrAlY.
[0010] Optionally, a second transition connection layer is provided on the inner surface of the first end, and the first wear-resistant layer is connected to the inner surface of the first end through the second transition connection layer.
[0011] Optionally, the second transition connection layer includes an MCrAlY layer and / or a modified material layer of MCrAlY.
[0012] Optionally, a third transition connection layer is provided on the inner surface of the second end, and the second wear-resistant layer is connected to the inner surface of the second end through the third transition connection layer.
[0013] Optionally, the third transition connection layer includes an MCrAlY layer and / or a modified material layer of MCrAlY.
[0014] Optionally, the valve guide body includes a main body portion connecting the first end and the second end;
[0015] An annular first recess is formed on the inner surface of the first end, and the first wear-resistant layer is disposed in the first recess; an annular second recess is formed on the inner surface of the second end, and the second wear-resistant layer is disposed in the second recess; the surfaces of the first wear-resistant layer and the second wear-resistant layer facing the axis of the valve guide are coplanar with the inner surface of the main body portion.
[0016] Optionally, the heat insulation layer includes at least one of an alumina layer, a silicon nitride layer, and a composite ceramic material layer.
[0017] Optionally, the first wear-resistant layer includes at least one of a silicon carbide layer, an aluminum nitride layer, and a composite ceramic material layer;
[0018] and / or, the second wear-resistant layer includes at least one of a silicon carbide layer, an aluminum nitride layer, and a composite ceramic material layer.
[0019] In application, the first end of the valve guide is close to the combustion chamber of the engine. Therefore, the temperature of the first end of the valve guide is the highest. In a high-temperature environment, the first end of the valve guide is prone to deformation and wear problems. In this application, a heat insulation layer is provided on the outer peripheral surface of the first end of the valve guide, which can effectively reduce the temperature of the first end of the valve guide, thereby slowing down the deformation of the first end of the valve guide, protecting the structural integrity of the valve guide, and extending the service life of the valve guide. The inner surfaces of the first end and the second end of the valve guide are the most severely worn during application. In this application, wear-resistant layers are provided on the inner surfaces of the first end and the second end of the valve guide, which can prevent uneven wear and other situations from occurring on the inner surfaces of the first end and the second end of the valve guide, thereby improving the wear resistance of the inner surfaces of the first end and the second end of the valve guide, improving the wear resistance of the entire valve guide, and extending the service life of the valve guide.
[0020] In addition, the valve guide provided in this application can reduce the frequency of maintenance and replacement, thereby reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a cross-sectional view of a valve guide provided by an embodiment of the present invention.
[0022] Icon: 1 - First end; 2 - Second end; 3 - Heat insulation layer; 4 - First wear-resistant layer; 5 - Second wear-resistant layer; 6 - First transition connection layer; 7 - Second transition connection layer; 8 - Third transition connection layer; 9 - Main body part. Detailed implementation manners
[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.
[0024] As Figure 1 shown, the valve guide includes a valve guide body, and the valve guide body includes a first end 1 and a second end 2. Among them, the first end 1 is used to face the combustion chamber of the engine. That is, in actual application, the first end 1 is the bottom end of the valve guide, and the first end 1 is closer to the combustion chamber of the engine than the second end 2. Further, a heat insulation layer 3 is provided on the outer peripheral surface of the first end 1, a first wear-resistant layer 4 is provided on the inner surface of the first end 1, and a second wear-resistant layer 5 is provided on the inner surface of the second end 2.
[0025] In application, the first end 1 of the valve guide is close to the combustion chamber of the engine. Therefore, the temperature of the first end 1 of the valve guide is the highest. In a high-temperature environment, the first end 1 of the valve guide is prone to deformation and wear problems. In this application, a heat insulation layer 3 is provided on the outer peripheral surface of the first end 1 of the valve guide, which can effectively reduce the temperature of the first end 1 of the valve guide, thereby slowing down the deformation of the first end 1 of the valve guide, protecting the structural integrity of the valve guide, and extending the service life of the valve guide. The inner surface of the first end 1 and the inner surface of the second end 2 of the valve guide are most severely worn during application. In this application, wear-resistant layers are provided on both the inner surface of the first end 1 and the inner surface of the second end 2 of the valve guide, which can prevent uneven wear and other situations from occurring on the inner surface of the first end 1 and the inner surface of the second end 2 of the valve guide, thereby improving the wear resistance of the inner surface of the first end 1 and the inner surface of the second end 2 of the valve guide, improving the wear resistance of the entire valve guide, and extending the service life of the valve guide.
[0026] In addition, the valve guide provided in this application can reduce the frequency of maintenance and replacement, thereby reducing costs.
[0027] The interfaces between different materials are in a state of stress concentration. The mismatch of the interfaces between the materials at the interfaces will cause differences in thermal expansion coefficients and inconsistencies in mechanical stresses, thereby increasing the failure risk of the valve guide under high-temperature and high-pressure conditions. Especially in a high-temperature environment, the difference in thermal expansion may cause interface cracking or delamination, affecting the overall stability and performance of the valve guide.
[0028] In one possible implementation, a first transition connection layer 6 is provided on the outer peripheral surface of the first end 1. The heat insulation layer 3 is connected to the outer peripheral surface of the first end 1 through the first transition connection layer 6 to improve the adhesion between different structural layers and to improve the problem of stress concentration at the interface between different materials.
[0029] During specific implementation, the first transition connection layer 6 can adopt an intermediate coating material with excellent bonding performance to ensure good bonding with the heat insulation layer 3 and the valve guide body. Exemplarily, the first transition connection layer 6 includes an MCrAlY layer and / or a modified material layer of MCrAlY, that is to say, the first transition connection layer 6 includes at least one of the MCrAlY layer and the modified material layer of MCrAlY.
[0030] In one possible implementation, a second transition connection layer 7 is provided on the inner surface of the first end 1. The first wear-resistant layer 4 is connected to the inner surface of the first end 1 through the second transition connection layer 7 to improve the adhesion between different structural layers and to improve the problem of stress concentration at the interface between different materials.
[0031] The second transition connection layer 7 can also adopt an intermediate coating material with excellent bonding performance to ensure good bonding with the first wear-resistant layer 4 and the valve guide body. Exemplarily, the second transition connection layer 7 includes an MCrAlY layer and / or a modified material layer of MCrAlY, that is to say, the second transition connection layer 7 includes at least one of the MCrAlY layer and the modified material layer of MCrAlY.
[0032] In one possible implementation, a third transition connection layer 8 is provided on the inner surface of the second end 2. The second wear-resistant layer 5 is connected to the inner surface of the second end 2 through the third transition connection layer 8 to improve the adhesion between different structural layers and to improve the problem of stress concentration at the interface between different materials.
[0033] The third transition connection layer 8 can adopt an intermediate coating material with excellent bonding performance to ensure good bonding with the second wear-resistant layer 5 and the valve guide body. Exemplarily, the third transition connection layer 8 includes an MCrAlY layer and / or a modified material layer of MCrAlY, that is to say, the third transition connection layer 8 includes at least one of the MCrAlY layer and the modified material layer of MCrAlY.
[0034] When preparing each transition connection layer, precise coating control techniques (including means such as uniformity control during spraying and coating thickness detection) are adopted to ensure the consistency and stability of the coating. The surface of the coating is inspected and tested in detail to ensure that the coating quality meets the standards.
[0035] The valve guide body includes a main body portion 9 connecting the first end 1 and the second end 2. In one possible implementation, an annular first recessed portion is formed on the inner surface of the first end 1, and the first wear-resistant layer 4 is disposed in the first recessed portion. An annular second recessed portion is formed on the inner surface of the second end 2, and the second wear-resistant layer 5 is disposed in the second recessed portion. The surfaces of the first wear-resistant layer 4 and the second wear-resistant layer 5 facing the axis of the valve guide are coplanar with the inner surface of the main body portion 9, thereby avoiding the influence of the settings of the first wear-resistant layer 4 and the second wear-resistant layer 5 on the reciprocating motion of the valve. It is not difficult to understand that when the first wear-resistant layer 4 is connected to the inner surface of the first end 1 through the second transition connection layer 7, the second transition connection layer 7 is disposed in the first recessed portion, and the first wear-resistant layer 4 is disposed on the surface of the second transition connection layer 7 and indirectly disposed in the first recessed portion. When the second wear-resistant layer 5 is connected to the inner surface of the second end 2 through the third transition connection layer 8, the third transition connection layer 8 is disposed in the second recessed portion, and the second wear-resistant layer 5 is disposed on the surface of the second recessed portion and further disposed in the second recessed portion.
[0036] In specific implementation, the heat insulation layer 3 can be a ceramic coating. For example, the heat insulation layer 3 includes at least one of an alumina (Al2O3) layer, a silicon nitride layer (Si3N4), and a composite ceramic material layer. These materials have extremely low thermal conductivity and excellent high-temperature stability, which is beneficial to the effective heat insulation of the outer peripheral surface of the first end 1 of the valve guide.
[0037] In specific implementation, according to the working temperature and heat load of the valve guide, the thickness of the heat insulation layer 3 can be set to 200 - 500 microns. For example, the thickness of the heat insulation layer 3 is 200 microns, 300 microns, or 500 microns.
[0038] Exemplarily, the ceramic heat insulation layer 3 can be prepared by plasma spraying technology, flame spraying technology, or nano-coating technology. These processes can evenly spray the ceramic material on the corresponding parts of the valve guide to ensure good bonding between the heat insulation layer 3 and the valve guide body. The spraying process is controlled within a temperature range of 1200 - 1500 °C to ensure the density and uniformity of the heat insulation layer 3.
[0039] In specific implementation, the first wear-resistant layer 4 can also be a ceramic coating. For example, the first wear-resistant layer 4 includes at least one of a silicon carbide (SiC) layer, an aluminum nitride (AlN) layer, and a composite ceramic material layer. These materials can effectively resist wear and friction and extend the durability of the valve guide.
[0040] The second wear-resistant layer 5 can also be a ceramic coating. For example, the second wear-resistant layer 5 includes at least one of a silicon carbide layer, an aluminum nitride layer, and a composite ceramic material layer. These materials can effectively resist wear and friction and extend the durability of the valve guide.
[0041] The thickness of the ceramic coating serving as the wear-resistant layer is determined according to the actual wear condition and the design requirements of the valve guide, so as to provide sufficient wear-resistant protection without affecting the inner diameter dimension of the valve guide. Exemplarily, the thickness of the ceramic coating serving as the wear-resistant layer is 100 to 300 microns.
[0042] In specific implementation, the ceramic coating serving as the wear-resistant layer can be prepared by using high-velocity oxy-fuel spraying technology (HVOF), laser cladding technology (LaserCladding) or nano-coating technology. These technologies can provide excellent wear resistance and adhesion. During the spraying process, the temperature of the material is controlled at 800 to 1200 °C to ensure the density and adhesion of the coating.
[0043] Obviously, those skilled in the art can make various changes and modifications to the present utility model without departing from the spirit and scope of the present utility model. Thus, if these modifications and variations of the present utility model fall within the scope of the claims of the present utility model and their equivalent technologies, the present utility model is also intended to include these changes and modifications.
Claims
1. A valve guide, characterized in that, It includes a valve guide body, and the valve guide body includes a first end and a second end. Among them, the first end is used to face the combustion chamber of the engine. An insulating layer is provided on the outer peripheral surface of the first end, and a first wear-resistant layer is provided on the inner surface of the first end, and a second wear-resistant layer is provided on the inner surface of the second end.
2. The valve guide according to claim 1, characterized in that, A first transition connection layer is provided on the outer peripheral surface of the first end, and the insulating layer is connected to the outer peripheral surface of the first end through the first transition connection layer.
3. The valve guide according to claim 2, characterized in that, The first transition connection layer includes an MCrAlY layer and / or a modified material layer of MCrAlY.
4. The valve guide according to claim 1 or 2, characterized in that, A second transition connection layer is provided on the inner surface of the first end, and the first wear-resistant layer is connected to the inner surface of the first end through the second transition connection layer.
5. The valve guide according to claim 4, characterized in that, The second transition connection layer includes an MCrAlY layer and / or a modified material layer of MCrAlY.
6. The valve guide according to claim 1 or 2, characterized in that, A third transition connection layer is provided on the inner surface of the second end, and the second wear-resistant layer is connected to the inner surface of the second end through the third transition connection layer.
7. The valve guide according to claim 6, characterized in that, The third transition connection layer includes an MCrAlY layer and / or a modified material layer of MCrAlY.
8. The valve guide according to any one of claims 1 to 3, characterized in that, The valve guide body includes a main body portion connecting the first end and the second end; An annular first recess is formed on the inner surface of the first end, and the first wear-resistant layer is arranged in the first recess; an annular second recess is formed on the inner surface of the second end, and the second wear-resistant layer is arranged in the second recess; the surfaces of the first wear-resistant layer and the second wear-resistant layer facing the axis of the valve guide are coplanar with the inner surface of the main body portion.
9. The valve guide according to any one of claims 1 to 3, characterized in that The insulating layer includes at least one of an alumina layer, a silicon nitride layer, and a composite ceramic material layer.
10. The valve guide according to any one of claims 1 to 3, characterized in that, The first wear-resistant layer includes at least one of a silicon carbide layer, an aluminum nitride layer, and a composite ceramic material layer; and / or, the second wear-resistant layer includes at least one of a silicon carbide layer, an aluminum nitride layer, and a composite ceramic material layer.