Cooling system for marine fuel injector

Abstract

A cooling system for a marine fuel injector is characterized in that the marine fuel injector is mounted on a cylinder cover, the lower part of the cylinder cover is connected with a cylinder sleeve, the upper part of the cylinder cover is connected with an exhaust valve, the lower part of the cylinder sleeve is provided with a cooling water inlet, and the upper part of the exhaust valve is provided with a cooling water outlet; the cooling system comprises a cooling water inner pipeline for connecting the cooling water space of the cylinder sleeve and the exhaust valve, the cooling water inner pipeline is a drill hole in the cylinder cover, the lower end of the cooling water inner pipeline is communicated with a cooling water inlet, the upper end of the cooling water inner pipeline is communicated with a cooling water outlet, and the middle section of the cooling water inner pipeline penetrates through a mounting hole of the marine fuel injector; cooling water enters from the cooling water inlet, enters the mounting hole of the fuel oil injector on the cylinder cover through the cooling water inner pipeline, is directly contacted with the fuel oil injector to finish the cooling function, and is finally discharged through the cooling water outlet. The cooling water inner channel is arranged in the cylinder cover, the risk that a cooling water channel is damaged is reduced, meanwhile, cooling water makes direct contact with the fuel oil injector, the cooling effect is improved, and the purpose of improving the reliability and stability of a cooling system of the fuel oil injector is achieved.

Description

Technical Field

[0001] The invention relates to a cooling structure of a pilot oil injector for a diesel engine, in particular to a cooling system for a marine pilot oil injector, belonging to the technical field of diesel engines. Background Art

[0002] The pilot oil injector is a very critical component in a marine diesel engine. Its function is to atomize the high-pressure fuel provided by the injection pump into fine particles and then spray it into the cylinder to form a combustible mixed gas with the air. The working state of the pilot oil injector directly affects the performance of the diesel engine, including power, economy, emissions and reliability, so the cooling of the pilot oil injector during operation is very critical.

[0003] At present, the cooling structure of the pilot oil injector is to add a branch from the cooling water inlet pipe, and transport the cooling water to the housing of the pilot oil injector through an external pipe to cool the pilot oil injector. However, this structure requires the addition of a dedicated pipe with a relatively thin diameter, and it is distributed on the cylinder head, which is easy to cause bumps and damage. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the cooling water pipeline of the pilot oil injector is easily damaged, and to provide a cooling system for the marine pilot oil injector, which eliminates the dedicated external pipeline for cooling the pilot oil injector and sets a cooling water channel connecting the cylinder liner cooling water space and the exhaust valve inside the cylinder head, thereby avoiding the risk of the cooling water pipeline being damaged and improving the cooling effect of the pilot oil injector.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] A cooling system for a marine pilot oil injector, wherein the marine pilot oil injector is mounted on a cylinder head, the lower part of the cylinder head is connected to a cylinder liner, the upper part is connected to an exhaust valve, the lower part of the cylinder liner is provided with a cooling water inlet, and the upper part of the exhaust valve is provided with a cooling water outlet; the cooling system comprises an inner cooling water pipe connecting the cooling water space of the cylinder liner and the exhaust valve, the inner cooling water pipe is a borehole in the cylinder head, the lower end is connected to the cooling water inlet, the upper end is connected to the cooling water outlet, and the middle section passes through the mounting hole of the marine pilot oil injector on the cylinder head;

[0007] Cooling water enters from the cooling water inlet, enters the mounting hole of the pilot oil injector on the cylinder head through the cooling water inner pipe, directly contacts the pilot oil injector, completes cooling of the pilot oil injector, and is finally discharged through the cooling water outlet on the exhaust valve.

[0008] Compared with the cooling structure of the conventional pilot oil injector, the beneficial effects of the present invention are:

[0009] 1) Reduced risk of damage to the cooling water circuit - the present invention eliminates the external cooling water pipeline with a relatively small diameter for the pilot oil injector, and instead drills holes inside the cylinder head to set up an internal cooling water channel, so that the cooling water circuit is not easily damaged by external forces, thereby improving the reliability of the pilot oil injector cooling system.

[0010] 2) Improved cooling effect of pilot oil injectors - by drilling holes to set up cooling water inner pipes, the cooling water supply is more stable, and the cooling water directly contacts the pilot oil injectors, greatly improving the cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a system schematic diagram of the present invention.

[0012] In the figure,

[0013] 1—cooling water inlet, 2—pilot oil injector, 3—cooling water outlet, 4—cylinder liner, 5—cylinder head, 6—exhaust valve, 7—cooling water internal pipeline. DETAILED DESCRIPTION

[0014] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings in order to more clearly understand the structure of the present invention, but this is not intended to limit the protection scope of the present invention.

[0015] The present invention is used for cooling of marine pilot oil injectors, see Figure 1 The pilot oil injector 2 is mounted on a cylinder head 5, the lower portion of which is connected to a cylinder liner 4, and the upper portion of which is connected to an exhaust valve 6. A cooling water inlet 1 is provided at the lower portion of the cylinder liner 4, and a cooling water outlet 3 is provided at the upper portion of the exhaust valve 6.

[0016] The cooling system for the marine pilot oil injector includes an inner cooling water pipe 7 connecting the cooling water space of the cylinder liner 4 and the exhaust valve 6. The inner cooling water pipe 7 is a drilled hole in the cylinder head 5, with the lower end connected to the cooling water inlet 1, the upper end connected to the cooling water outlet 3, and the middle section passing through the mounting hole of the pilot oil injector 2 on the cylinder head 5.

[0017] The specific working principle of the present invention is as follows:

[0018] The cooling water from the cabin enters through the cooling water inlet 1 on the cylinder liner 4, flows through the cooling water space of the cylinder liner 4, enters the mounting hole of the pilot oil injector 2 on the cylinder head 5 through the cooling water inner pipe 7, directly contacts the pilot oil injector 2, completes the cooling of the pilot oil injector 2, and then reaches the exhaust valve 6, and is finally discharged through the cooling water outlet 3 and flows back into the cabin.

[0019] The newly added cooling water inner pipeline of the cooling system for marine pilot oil injectors connects the cylinder liner cooling water space and the exhaust valve, thereby achieving the purpose of directly cooling the pilot oil injectors, making the cooling effect better, and replacing the original redundant structure, thereby improving the safety and reliability of system operation.

[0020] The above are only preferred embodiments of the present invention. It must be pointed out that all equivalent modifications, changes and amendments made by technicians in the relevant field according to the content of the application of the present invention should fall within the scope of protection required by the present invention.

Claims

1. A cooling system for a marine pilot oil injector, wherein the marine pilot oil injector is mounted on a cylinder head, the lower part of the cylinder head is connected to a cylinder liner, and the upper part is connected to an exhaust valve, the lower part of the cylinder liner is provided with a cooling water inlet, and the upper part of the exhaust valve is provided with a cooling water outlet; characterized in that: The cooling system includes a cooling water inner pipe connecting the cooling water space of the cylinder liner and the exhaust valve, the cooling water inner pipe is a borehole in the cylinder head, the lower end of the cooling water inner pipe is connected to the cooling water inlet, the upper end is connected to the cooling water outlet, and the middle section passes through the installation hole of the marine pilot oil injector on the cylinder head; Cooling water enters from the cooling water inlet, enters the mounting hole of the pilot oil injector on the cylinder head through the cooling water inner pipe, directly contacts the pilot oil injector, completes cooling of the pilot oil injector, and is finally discharged through the cooling water outlet on the exhaust valve.

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