A natural gas engine injector cylinder head and spark plug boot structure

Abstract

The utility model relates to natural gas engine field, concretely relates to a natural gas engine oil atomizer cylinder cover and spark plug sheath structure, cylinder cover include cylinder cover bottom plate and spark plug installation boss, cylinder cover bottom plate with spark plug installation boss integrated moulding, cylinder cover inside still be provided with spark plug sheath, upper water jacket and lower water jacket, upper water jacket with lower water jacket intercommunication, solved the natural gas engine power bigger and bigger of present stage, combustion temperature higher and higher, lead to steam cylinder cover cannot bear high temperature and appear the problem of cracking.

Description

Technical Field

[0001] This utility model relates to the field of natural gas engines, specifically to a structure for a natural gas engine injector cylinder head and spark plug sleeve. Background Technology

[0002] Currently, among various engine products, natural gas engines are becoming increasingly widely used due to their low gas price, good operating economy, and clean emissions. However, as the power of natural gas engines increases and the combustion temperature rises, the cylinder head cannot withstand the high temperature and cracks, especially in the high-temperature and large-temperature-difference area of ​​the cylinder head bridge, resulting in a high failure rate and weak reliability. Cracks in the cylinder head bridge area of ​​natural gas engines have become an industry-wide technical challenge for the development of natural gas engines.

[0003] In summary, a structure for the cylinder head and spark plug sleeve of a natural gas engine injector is proposed to solve the aforementioned problems. Utility Model Content

[0004] The purpose of this utility model is to provide a structure for the cylinder head and spark plug sleeve of a natural gas engine injector to solve the problem that the cylinder head cannot withstand the high temperature and cracks due to the increasing power and combustion temperature of natural gas engines.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A cylinder head and spark plug sleeve structure for a natural gas engine injector, wherein the cylinder head includes a cylinder head base plate and a spark plug mounting boss, the cylinder head base plate and the spark plug mounting boss are integrally formed, and the cylinder head is further provided with a spark plug sleeve, an upper water jacket and a lower water jacket, the upper water jacket and the lower water jacket being connected.

[0006] Furthermore, the water outlet of the lower water jacket is flared, which accelerates the water flow speed and increases the heat dissipation of the spark plug mounting boss.

[0007] Further defined, the spark plug sleeve has an inverted trapezoidal structure, including an upper part and a lower part. The lower part of the spark plug sleeve is provided with an internal thread and has a length dimension of L. The spark plug is threadedly connected to the internal thread of the spark plug sleeve through the external thread and is disposed in the spark plug sleeve. The bottom of the spark plug sleeve and the connection between it and the cylinder head bottom plate are provided with a rounded corner design with a radius of 2mm.

[0008] Furthermore, the spark plug sleeve and the spark plug mounting boss are installed using a small interference fit.

[0009] Further specifying, the distance between the boundary of the spark plug mounting boss and the boundary of the water inlet of the lower water jacket is L1, and L1 is 3mm.

[0010] The advantages of this utility model over the current technology are as follows: 1. The flared design of the lower water jacket accelerates the water flow, allowing for better heat dissipation from the spark plug mounting boss. The dimension L1 is generally controlled at around 3mm, its function being to regulate the water flow. 2. The distance between the boundary of the spark plug mounting boss and the boundary of the water inlet of the lower water jacket is 3mm, which is used to regulate the water flow. 3. The spark plug sleeve has internal threads at the bottom instead of threads throughout to avoid stress concentration caused by the threads of a fully threaded structure coming into contact with high temperatures, which could lead to cracking of the cylinder head base plate. Attached Figure Description

[0011] Figure 1 This is a cross-sectional schematic diagram of the cylinder head of this utility model; Figure 2 This is a cross-sectional view of the spark plug of this utility model installed inside the cylinder head.

[0012] The markings in the diagram correspond to: 1-Cylinder head base plate, 2-Spark plug mounting boss, 3-Spark plug sleeve, 4-Upper water jacket, 5-Lower water jacket, 6-Water outlet, 7-Spark plug. Detailed Implementation

[0013] To enable those skilled in the art to better understand the technical solution of this utility model, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and embodiments. Example

[0014] like Figure 1 and Figure 2As shown, a natural gas engine injector cylinder head and spark plug sleeve structure are disclosed. The cylinder head includes a cylinder head base plate 1 and a spark plug mounting boss 2. The cylinder head base plate 1 and the spark plug mounting boss 2 are integrally formed and made of vermicular iron, which has strong thermal conductivity and ductility, enabling rapid heat dissipation from the cylinder head base plate 1 through cooling water, thereby reducing the temperature of the cylinder head base plate 1 and reducing the risk of high-temperature cracking. Inside the cylinder head, there are spark plug sleeves 3, an upper water jacket 4, and a lower water jacket 5. The upper water jacket 4 and the lower water jacket 5 are connected. The water outlet 6 of the lower water jacket 4 is funnel-shaped, which accelerates the water flow speed and increases the heat dissipation of the spark plug mounting boss 2. Cooling water flows from the upper water jacket 4 through the lower water jacket 5, through the funnel-shaped water outlet 6, carrying away heat and thus reducing the temperature of the spark plug 7, thereby reducing the high-temperature erosion failure rate of the spark plug 7. The distance between the boundary of the spark plug mounting boss 2 and the boundary of the water outlet 6 of the lower water jacket 5 is L1, which is 3mm, and its function is to regulate the water flow. The spark plug sleeve 3 has an inverted trapezoidal structure, including an upper part and a lower part. The lower part is provided with an internal thread, and its length is L. The spark plug 7 is connected to the spark plug sleeve 3 by the external thread and the internal thread of the spark plug sleeve 3 and is installed inside the spark plug sleeve 3. The bottom of the spark plug sleeve 3 and the connection point with the cylinder head bottom plate 1 are provided with a radius of 2mm. The spark plug sleeve 3 features a rounded corner design and an internal thread at the bottom, instead of being threaded throughout. This is to avoid stress concentration caused by the threads of a fully threaded structure coming into contact with high temperatures, which could lead to cracking of the cylinder head base plate 1. The diameter of the spark plug sleeve 3 is D, and the diameter of the spark plug mounting boss 2 is d. The spark plug sleeve 3 and the spark plug mounting boss 2 are connected by a small interference fit, that is, the diameters D and d are interference fit. This can seal water on the one hand and effectively release stress on the other. The installation height of the spark plug mounting boss 2 is L2, which is 10mm.

[0015] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., 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, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0016] The above provides a detailed description of the structure of the cylinder head and spark plug sleeve for a natural gas engine injector provided by this utility model. The description of the specific embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the present utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A structure for a natural gas engine injector cylinder head and spark plug sleeve, characterized in that: The cylinder head includes a cylinder head base plate (1) and a spark plug mounting boss (2). The cylinder head base plate (1) and the spark plug mounting boss (2) are integrally formed. The cylinder head is also provided with a spark plug sleeve (3), an upper water jacket (4) and a lower water jacket (5). The upper water jacket (4) and the lower water jacket (5) are connected.

2. The structure of a natural gas engine injector cylinder head and spark plug sleeve according to claim 1, characterized in that: The water outlet of the lower water jacket (5) is horn-shaped, which accelerates the water flow speed and increases the heat dissipation of the spark plug mounting boss (2).

3. The structure of a natural gas engine injector cylinder head and spark plug sleeve according to claim 1, characterized in that: The spark plug sleeve (3) has an inverted trapezoidal structure, including an upper part and a lower part. The lower part of the spark plug sleeve (3) is provided with an internal thread and has a length dimension of L. The spark plug (7) is threadedly connected to the spark plug sleeve (3) through the external thread and the internal thread of the spark plug sleeve (3). The bottom of the spark plug sleeve (3) and the connection between it and the cylinder head bottom plate (1) are provided with a rounded corner design with a radius of 2mm.

4. The structure of a natural gas engine injector cylinder head and spark plug sleeve according to claim 1, characterized in that: The spark plug sleeve (3) and the spark plug mounting boss (2) are installed with a small interference fit.

5. The structure of a natural gas engine injector cylinder head and spark plug sleeve according to claim 1, characterized in that: The distance between the boundary of the spark plug mounting boss (2) and the boundary of the water outlet (6) of the lower water jacket (5) is L1, and L1 is 3mm.

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