Natural gas engine cylinder cover solid casting spark plug sheath structure

Abstract

The utility model discloses a natural gas engine cylinder cover solid casting spark plug sheath structure which comprises a cylinder cover bottom plate, a solid casting spark plug sheath and a cylinder cover oil groove pool face and further comprises an upper water jacket, a lower water jacket, a partition plate, a threaded hole and a spark plug. The upper water jacket and the lower water jacket are separated through a partition plate. The whole cylinder cover is made of vermicular iron, the heat conduction capacity and the ductility are high, heat of the bottom plate of the cylinder cover can be quickly conducted out and taken away through cooling water, the temperature of the bottom plate of the cylinder cover is lowered, high-temperature cracking faults are reduced, and the cylinder cover is simple in structure, high in strength and convenient to achieve; the cylinder cover bottom plate dissipates heat through water flowing from the upper water jacket to the lower water jacket, the water flow is controlled through the gap size L1 and the gap size L2 between the cylinder cover bottom plate and the middle partition plate, L1 and L2 are generally controlled to range from 4 mm to 10 mm, and the larger the gap is, the larger the water flow is, and the faster heat dissipation is.

Description

Technical Field

[0001] The utility model belongs to the technical field of natural gas engines, and in particular relates to a solid cast spark plug sheath structure of a cylinder cover of a natural gas engine. Background Art

[0002] Among various engine products currently available, natural gas engines are increasingly widely used due to their low gas prices, good operating economy and clean emissions. According to their different ignition methods, they can be divided into spark-ignition natural gas engines, compression-ignition natural gas engines and diesel-ignition natural gas engines.

[0003] However, as the power of natural gas engines increases and the combustion temperature becomes higher and higher, the cylinder head cannot withstand the high temperature and cracks begin to appear, especially in the nose bridge area of ​​the cylinder head where the temperature is high and the temperature difference is large. The failure rate is high and the reliability is weak. Cracking in the nose bridge area of ​​the cylinder head of the natural gas engine has become an industry technical problem in the development of natural gas engines. Utility Model Content

[0004] The utility model provides a solid cast spark plug sleeve structure for a natural gas engine cylinder head, which solves the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a solid cast spark plug sleeve structure for a natural gas engine cylinder head, including a cylinder head bottom plate, a solid cast spark plug sleeve and a cylinder head oil tank pool surface, and also including an upper water jacket, a lower water jacket, a partition, a threaded hole and a spark plug, the spark plug sleeve is wrapped between the upper water jacket and the lower water jacket, and the upper water jacket and the lower water jacket are separated by a partition.

[0006] Preferably, the cylinder head bottom plate, the solid cast spark plug boot and the cylinder head oil tank pool surface are integrally cast to form an "I"-shaped structure.

[0007] Preferably, the spark plug is threadedly connected to the spark plug sleeve through a threaded hole.

[0008] The beneficial effects of adopting the above technical solution are:

[0009] 1. The entire material of the cylinder head of the utility model is vermicular iron, which has strong thermal conductivity and ductility, can quickly conduct the heat of the cylinder head base plate and take it away through cooling water, thereby reducing the temperature of the cylinder head base plate and reducing high-temperature cracking failures. It has a simple structure, high strength, and is easy to implement.

[0010] 2. The cylinder head bottom plate of the utility model dissipates heat through the water flowing from the upper water jacket to the lower water jacket, and the water flow rate is controlled by the gap sizes L1 and L2 with the middle partition; L1 and L2 are generally controlled between (4-10) mm. The larger the gap, the greater the water flow rate and the faster the heat dissipation. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is an assembly drawing provided by the utility model;

[0012] Figure 2 It is an assembly sectional view of the utility model;

[0013] in:

[0014] 1. Cylinder head base plate; 2. Spark plug sleeve; 3. Cylinder head oil tank surface; 4. Upper water jacket; 5. Lower water jacket; 6. Partition; 7. Threaded hole; 8. Spark plug. DETAILED DESCRIPTION

[0015] The specific implementation methods of the utility model are further explained in detail below with reference to the accompanying drawings through the description of embodiments, with the aim of helping technicians in the field to have a more complete, accurate and in-depth understanding of the concept and technical solution of the utility model and facilitating its implementation.

[0016] Specifically, Figure 1 to Figure 2 As shown, a natural gas engine cylinder head solid cast spark plug sleeve structure includes a cylinder head bottom plate 1, a solid cast spark plug sleeve 2 and a cylinder head oil tank pool surface 3, and also includes an upper water jacket 4, a lower water jacket 5, a partition 6, a threaded hole 7 and a spark plug 8, wherein the spark plug sleeve 2 is wrapped between the upper water jacket 4 and the lower water jacket 5, and the upper water jacket 4 and the lower water jacket 5 are separated by a partition 6;

[0017] The cylinder head base plate 1 dissipates heat through the water flowing from the upper water jacket 4 to the lower water jacket 5, and the water flow rate is controlled by the gap sizes L1 and L2 with the partition 6; L1 and L2 are generally controlled between (4-10) mm. The larger the gap, the greater the water flow rate and the faster the heat dissipation.

[0018] The wall thickness dimension L3 of the spark plug sheath 2 is determined according to the inner diameter dimension D of the spark plug sheath 2 and the gap dimensions L1 and L2. According to the casting process requirement, L3 ≥ 3 mm.

[0019] The cylinder head base plate 1, the spark plug sleeve 2 and the cylinder head oil tank pool surface 3 are integrally molded and cast to form an "I"-shaped structure. The spark plug sleeve 2 acts like a pillar. When the cylinder head base plate 1 continuously reciprocates in the combustion chamber, the "I"-shaped structure can effectively support the cylinder head base plate 1, thereby reducing the risk of cracking of the cylinder head base plate 1.

[0020] Spark plug 8 is threadedly connected to spark plug sleeve 2 through threaded hole 7.

[0021] The specific working method is described below with specific embodiments: Example 1

[0022] The spark plug 8 is connected to the solid cast spark plug sleeve 2 through the threaded hole 7. After the spark plug 8 passes through the high temperature of the combustion chamber, the cylinder head base plate 1 dissipates heat through the water flow from the upper water jacket 4 to the lower water jacket 5. The water flow rate is controlled by the gap sizes L1 and L2 with the partition 6. The larger the gap, the greater the water flow rate and the faster the heat dissipation. The heat of the cylinder head base plate 1 is quickly discharged and taken away by cooling water, thereby reducing the temperature of the cylinder head base plate 1 and reducing high-temperature cracking failures.

[0023] The above is an exemplary description of the utility model in conjunction with the accompanying drawings. Obviously, the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the utility model; or the above-mentioned concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A solid cast spark plug sleeve structure for a natural gas engine cylinder head, comprising a cylinder head bottom plate (1), a solid cast spark plug sleeve (2) and a cylinder head oil tank surface (3), characterized in that: It also comprises an upper water jacket (4), a lower water jacket (5), a partition (6), a threaded hole (7) and a spark plug (8), wherein the spark plug jacket (2) is wrapped between the upper water jacket (4) and the lower water jacket (5), and the upper water jacket (4) and the lower water jacket (5) are separated by the partition (6).

2. The solid cast spark plug sheath structure for a natural gas engine cylinder head according to claim 1, characterized in that: The cylinder head bottom plate (1), the solid cast spark plug sleeve (2) and the cylinder head oil tank pool surface (3) are integrally cast and form an "I"-shaped structure.

3. The solid cast spark plug sheath structure for a natural gas engine cylinder head according to claim 1, characterized in that: The spark plug (8) is threadedly connected to the spark plug sleeve (2) via a threaded hole (7).

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