CN201786407U - Marine diesel engine exhaust valve - Google Patents

Abstract

The utility model discloses an exhaust valve for a marine diesel engine, which comprises a valve body (1) whose lower part is sealed and connected to the cylinder head (3), and which also includes a valve body (1) which is sealed and connected to the lower end of the valve body (1) and is sealed and connected to the cylinder head. The valve seat (4) in (3), the valve seat (4) is provided with a support surface (Z) that is attached to the lower end surface of the valve body (1), and the support surface of the valve seat (4) is along the A plurality of cooling water blind holes (4.1) communicating with the cooling water channel of the valve body (1) are provided downward on the seat body. The advantages of the exhaust valve for marine diesel engines are: when the sealing surface of the valve seat is worn and the sealing surface of the valve seat is not tightly sealed, the entire exhaust valve body does not need to be scrapped, and only the valve seat needs to be replaced, which saves the replacement cost. Moreover, the exhaust valve of the marine diesel engine makes the work of the exhaust valve more reliable and avoids some potential safety hazards.

Description

Exhaust valve for marine diesel engine

technical field

The utility model relates to the technical field of marine diesel engines, in particular to an exhaust valve for marine diesel engines. the

Background technique

The working conditions of the exhaust valve in the marine diesel engine are very harsh. The valve seat on the bottom surface of the valve is in direct contact with the high-temperature combustion and explosion products, and it is also subjected to high-temperature and high-speed erosion of corrosive gases during the opening of the valve. Excessively high temperature will reduce the mechanical properties of the metal material, thermal deformation of the material, and the valve stem collides with the valve seat when the valve is closed, which will easily cause deformation and severe wear of the sealing cone surface of the valve seat, resulting in high-temperature gas leakage. It will cause high-temperature gas to burn the valve surface, and even melt through the metal material, which will affect the reliability of the diesel engine. The exhaust valve body in the prior art is generally a casting. Once the sealing surface of the exhaust valve seat is worn and the sealing surface of the valve seat is not tight, the entire exhaust valve body needs to be scrapped, and the replacement cost is very high, resulting in A lot of waste. the

Utility model content

The technical problem to be solved by the utility model is to provide a marine diesel engine exhaust valve with high reliability and low replacement cost. the

The technical solution adopted by the utility model to solve the above problems is: a marine diesel engine exhaust valve, which includes a valve body whose lower part is sealed and connected to the cylinder head, and which also includes a valve body that is sealed and connected to the lower end of the valve body and is sealed and connected to the cylinder head. The valve seat, the valve seat is provided with a support surface that fits with the lower end surface of the valve body, and the support surface of the valve seat is provided with a plurality of cooling water blinds communicating with the cooling water channel of the valve body along the seat body. hole. the

Compared with the prior art, the utility model has the advantages that: the valve seat of the exhaust valve of the marine diesel engine is sealed and connected to the lower end of the valve body, and is sealed and connected to the cylinder head. When the sealing surface of the valve seat is worn and the sealing surface of the valve seat is not tightly sealed, it is not necessary to scrap the entire exhaust valve body, only the valve seat needs to be replaced, which saves the replacement cost. Moreover, the exhaust valve of the marine diesel engine makes the work of the exhaust valve more reliable and avoids some potential safety hazards. the

Preferably, the number of the cooling water blind holes is 36, and the 36 cooling water blind holes are evenly distributed along the base body. In this way, the arrangement of the cooling water blind hole is reasonable, and the inner wall of the valve seat can be fully cooled by water, so that the valve seat is evenly heated, and the cooling effect of the valve seat is enhanced. the

Preferably, the included angle between the cooling water blind hole and the first axis is 26°. In this way, the cooling of the sealing tapered surface of the valve seat is more effective. the

Preferably, the valve seat is a forging. The original exhaust valve is an integral casting with a relatively loose structure. For the valve seat, which has complicated working conditions and is prone to wear, its mechanical properties cannot meet the requirements. The mechanical properties of forgings are significantly better than castings, which can ensure a longer service life of the valve seat. the

Description of drawings

Fig. 1 is a structural schematic diagram of the exhaust valve of a marine diesel engine of the present utility model. the

Fig. 2 Fig. 1 is a schematic cross-sectional structure diagram of the valve seat along the direction A-A. the

In Figure 1-2: 1 valve body, 2 valve stem, 2.1 valve disc, 3 cylinder head, 4 valve seat, 4.1 cooling water blind hole, 4.2 sealing cone surface, X horizontal line, Y first axis, Z bearing surface. the

Detailed ways

Embodiments of the utility model will be further described below in conjunction with the accompanying drawings. the

As shown in Figure 1-2, an exhaust valve for a marine diesel engine includes a valve body 1 whose lower part is sealed and connected to the cylinder head 3 through an O-ring, and which is also connected to the lower end of the valve body 1 through an O-ring. At the same time, it is sealed and connected to the valve seat 4 in the cylinder head 3 through an O-ring seal. The valve seat 4 is provided with a support surface Z that fits the lower end surface of the valve body 1, and the support surface Z of the valve seat 4 is downward along the seat body. There are 36 cooling water blind holes 4.1 communicating with the cooling water channel of the valve body 1, and the 36 cooling water blind holes 4.1 are evenly distributed along the inner wall circumference of the seat. the

The valve stem 2 is slidingly fitted in the valve body 1, and the lower end of the valve seat 4 is provided with a sealing cone surface 4.2 forming a line seal with the valve disc 2.1 of the valve stem 2; the angle between the sealing cone surface 4.2 and the horizontal line X is 30°. the

The included angle between the cooling water blind hole 4.1 and the first axis Y is 24°-30°. In this embodiment, the angle between the cooling water blind hole 4.1 and the first axis Y is 26°. In this way, the cooling of the sealing cone surface 4.2 of the valve seat 4 is more effective. the

In this example, the valve seat 4 is a forging. For the valve seat 4, which has complicated working conditions and is prone to wear, the mechanical performance of the forging is obviously better than that of the casting, which can ensure that the valve seat 4 has a longer service life. the

The above only illustrates the best embodiments of the present utility model, but should not be construed as a limitation on the claims. The utility model is not limited to the above embodiments, and its specific structure is allowed to be changed, such as: the number of cooling water blind holes 4.1 is variable; and so on. All changes made within the scope of protection of the independent claims of the utility model are within the scope of protection of the utility model. the

Claims (5)

1. marine diesel engine outlet valve, comprise that lower seal is connected in the valve body (1) in the cylinder head (3), it is characterized in that: it also comprises and is sealedly attached to valve body (1) lower end, and be sealedly attached to the valve seat (4) in the cylinder head (3), described valve seat (4) is provided with the supporting surface (Z) that fits with valve body (1) lower end surface, the supporting surface of described valve seat (4) along pedestal to having the cooling water blind hole (4.1) that cooling water channel a plurality of and valve body (1) communicates.

2. marine diesel engine outlet valve according to claim 1 is characterized in that: the quantity of described cooling water blind hole (4.1) is 36, and described 36 cooling water blind holes (4.1) evenly distribute along the base vivo wall circumference.

3. marine diesel engine outlet valve according to claim 1 is characterized in that: the angle between described cooling water blind hole (4.1) and the first axle (Y) is 24 °～30 °.

4. marine diesel engine outlet valve according to claim 3 is characterized in that: the angle between described cooling water blind hole (4.1) and the first axle (Y) is 26 °.

5. marine diesel engine outlet valve according to claim 1 is characterized in that: described valve seat (4) is a forging.

Images