CN217632749U

CN217632749U - Marine low-speed diesel engine high pressure fuel pipe testing tool

Info

Publication number: CN217632749U
Application number: CN202122344333.4U
Authority: CN
Inventors: 杜鹏; 孙嘉英; 梅继川
Original assignee: Dalian Marine Diesel Co ltd
Current assignee: Dalian Marine Diesel Co ltd
Priority date: 2021-09-27
Filing date: 2021-09-27
Publication date: 2022-10-21
Anticipated expiration: 2031-09-27

Abstract

The high-pressure fuel pipe testing tool of the marine low-speed diesel engine comprises two end blocks; the first end block is a cylinder with a through hole in the center, the outer circle of the lower section of the cylinder is provided with a thread connected with the upper end connector of the high-pressure fuel pipe, a sealing groove is arranged on the outer circle close to the upper surface of the thread, and a sealing ring is arranged in the groove and is sealed in connection with the high-pressure fuel pipe; the upper section of a through hole in the center of one end block is a connecting hole with internal threads, and a deflation screw is arranged in the connecting hole; the second end block is a cylinder with a through hole in the center, the inner circle in the middle section of the through hole is a thread connected with a joint at the lower end of the high-pressure oil pipe, the upper section of the through hole close to the thread is provided with a circular expanding hole, the circular expanding hole is matched and sealed with an excircle sealing groove of a connector at the lower end of the high-pressure oil pipe and a sealing ring, the wall of the circular expanding hole below the matched seal is provided with a leakage inspection hole, the lower section of the through hole is a connecting hole with internal threads, and a An Zhuangfang round gasket is arranged in the connecting hole and is communicated with a quick joint of the hydraulic pipe.

Description

Marine low-speed diesel engine high pressure fuel pipe testing tool

Technical Field

The invention is used for realizing the pressure test of the high-pressure fuel pipe of the marine low-speed diesel engine. The simple device forms an installation method, and can quickly detect whether the high-pressure fuel pipe has a leakage problem.

Background

In the manufacturing process of a marine low-speed diesel engine (hereinafter referred to as a 'main engine'), a high-pressure fuel pipe is an important pipeline of the main engine, and high-pressure fuel (800 bar) pressurized by a fuel pump is conveyed to a fuel injector to be injected into a combustion chamber. According to the different cylinder diameters of the main engine, 2-4 cylinders are arranged in each cylinder, and the main engine is generally 5-7 cylinders (as shown in figure 1). The host standard distribution tool does not contain a high-pressure fuel pipe pressure monitoring tool, and once the fuel leakage problem occurs on the ship, relevant pressure tests cannot be immediately carried out, and the problem reason cannot be quickly found out. Part of shipowners have specifically requested the addition of fuel line pressure test tools and have provided a set of high pressure fuel line test tool installation methods. Therefore, a simple test tool for the high-pressure fuel pipe of the low-speed diesel engine for the ship needs to be designed to solve the problems.

Disclosure of Invention

The invention relates to a testing tool for a high-pressure fuel pipe of a marine low-speed diesel engine, which consists of two

end blocks

2 and 3, wherein the two end blocks are respectively arranged at two sides of a high-pressure fuel pipe 1 of a main engine, and the internal structure of the end blocks imitates the connecting part structure of the high-pressure fuel pipe and a high-pressure fuel pump as well as the connecting part structure of a fuel injector and the high-pressure fuel pipe, and is characterized in that: the end block I2 is a cylinder with a through hole in the center, the outer circle of the lower section of the cylinder is provided with a thread 2-3 connected with the upper end connector of the high-pressure oil pipe, the outer circle close to the upper side of the thread is provided with a sealing groove 2-2, and a sealing ring is arranged in the groove and used for connecting and sealing with the high-pressure fuel oil pipe; the upper section of a through hole in the center of one end block is a connecting hole 2-1 with internal threads, and a deflation screw is arranged in the connecting hole; the second end block 3 is a cylinder with a through hole in the center, the inner circle of the middle section of the through hole is a thread 3-1 connected with a connector at the lower end of a high-pressure oil pipe, the upper section of the through hole close to the thread is provided with a circular hole expanding, the circular hole expanding is matched and sealed with a sealing groove and a sealing ring of the outer circle of the connector at the lower end of the high-pressure oil pipe, the wall of the circular hole expanding below the matched seal is provided with a leakage inspection hole 3-3, the lower section of the through hole is a connecting hole 3-2 with internal threads, and a An Zhuangfang circular gasket is arranged in the connecting hole and is communicated with a quick connector of a hydraulic pipe.

An Zhuangfang round gasket in the connecting hole is communicated with the hydraulic pipe quick joint, then the air release screw is arranged at a high position, and An Zhuangfang round gasket in the connecting hole is arranged at a low position together with the hydraulic pipe quick joint; one end of the end block is connected with the high-pressure fuel pipe, and the device is arranged at two ends of the high-pressure fuel pipe, so that the functions of installation, sealing, air release, external connection with a high-pressure lubricating oil inlet, leakage inspection holes and the like required by a pressure test are realized; the oil inlet hole and the air vent are arranged on the end block, the sizes of the holes are the same, and the mounting positions can be exchanged according to the actual mounting condition of the oil pipe; the device has the characteristics of small size and simple and easy installation; whether the high-pressure fuel pipe leaks or not can be quickly judged according to the leakage check hole.

Drawings

FIG. 1: the host is provided with four high-pressure fuel pipes;

FIG. 2: the structural schematic diagrams of two ends of the high-pressure fuel pipe are shown;

figure 3 front view andbase:Sub>A-base:Sub>A cross-sectional view of the construction of the first end-block;

FIG. 4 is a schematic view of the mounting of the first end block to a high pressure fuel line;

figure 5 front view and cross-sectionalbase:Sub>A-base:Sub>A view of the structure of end block two;

FIG. 6 is a schematic view of the mounting of the second end block to the high pressure fuel pipe;

FIG. 7 is a schematic diagram of the high pressure fuel pipe test tool and method of installation of the present invention.

Detailed Description

The invention relates to a testing tool for a high-pressure fuel pipe of a low-speed diesel engine for a ship, which is shown in a drawing. The internal structure of the end block is designed by imitating the connecting parts of the high-pressure fuel pipe and the high-pressure fuel pump and the fuel injector and the high-pressure fuel pipe (as shown in figure 2), a hydraulic oil inlet is arranged on the end block and is externally connected with a fuel supply pipeline of a hydraulic pump, a gas release port is used for discharging air in the pipe during the oil injection, and a fuel leakage inspection port is used for inspecting whether fuel leakage exists. The oil inlet hole and the air vent are arranged on the end block, the sizes of the holes are the same, and the mounting positions can be exchanged according to the actual mounting condition of the oil pipe; the device has the characteristics of small size and simple and easy installation, and can quickly judge whether the high-pressure fuel pipe leaks or not.

end blocks

2 and 3, wherein the two end blocks are respectively arranged at two sides of a high-pressure fuel pipe 1 of a main engine, the internal structure of the end blocks imitates the connecting part structure of the high-pressure fuel pipe and a high-pressure fuel pump as well as the connecting part structure of a fuel injector and the high-pressure fuel pipe, and the testing tool is characterized in that: the end block I2 is a cylinder with a through hole in the center, the outer circle of the lower section of the cylinder is provided with a thread 2-3 connected with the upper end connector of the high-pressure oil pipe, the outer circle close to the upper side of the thread is provided with a sealing groove 2-2, and a sealing ring is arranged in the groove and used for connecting and sealing with the high-pressure fuel oil pipe; the upper section of a through hole in the center of the end block is a connecting hole 2-1 with internal threads, and a deflation screw is arranged in the connecting hole; the second end block 3 is a cylinder with a through hole in the center, the inner circle of the middle section of the through hole is a thread 3-1 connected with a joint at the lower end of the high-pressure oil pipe, the upper section of the through hole close to the thread is provided with a circular expanding hole, the circular expanding hole is matched and sealed with a sealing groove and a sealing ring at the outer circle of a joint at the lower end of the high-pressure oil pipe, the wall of the circular expanding hole below the matched seal is provided with a leakage inspection hole 3-3, the lower section of the through hole is a connecting hole 3-2 with internal threads, and a An Zhuangfang circular gasket is arranged in the connecting hole and is communicated with a quick joint of the hydraulic pipe.

The test tool consists of:

1. end block one

A sealing ring is arranged in a groove of a first end block (shown in figure 3) and is used for sealing connection with a high-pressure fuel pipe; an air bleed screw or a round gasket and a hydraulic pipe quick connector can be arranged in the connecting hole (the air bleed screw is arranged at a high position and the round gasket and the hydraulic pipe quick connector are arranged at a low position according to the actual installation condition); one end of the end block is connected to a high pressure fuel pipe (see figure 4).

2. End block two

A leakage inspection hole is arranged on the second end block (as shown in figure 5); the internal threads of the end block are connected with a high-pressure fuel pipe (as shown in figure 6); the connecting hole can be internally provided with a deflation screw or a round gasket and a hydraulic pipe quick joint. (according to the actual installation situation, the general air release screw is installed at the high position, and the round gasket and the hydraulic pipe quick joint are installed at the low position).

Installation and use method (as shown in fig. 7):

1. and screwing the two end blocks into the two sides of the high-pressure fuel pipe.

2. A round gasket and a quick joint are arranged at the lower end of the position; and a deflation screw is arranged at the higher end of the air bag.

3. The pneumatic hydraulic pump and the quick connector are connected through a hydraulic hose, the air release screw is loosened through an inner hexagonal wrench, the hydraulic pump is started to fill oil into the pipe until no air bubbles are discharged from the air release port, and the air release screw is tightened.

4. And raising the pump pressure of the hydraulic pump, and gradually raising the oil pressure to meet the requirement required by the test pressure.

5. And observing whether oil flows out of the drainage inspection hole.

Claims

1. The utility model provides a marine low-speed diesel engine high pressure fuel pipe test tool, comprises both ends piece, and both ends piece is installed respectively in host computer high pressure fuel pipe both sides, and end piece inner structure imitates high pressure fuel pipe and high pressure fuel pump, sprayer and high pressure fuel pipe adapting unit structure, its characterized in that: the first end block is a cylinder with a through hole in the center, the outer circle of the lower section of the cylinder is provided with a thread connected with the upper end connector of the high-pressure fuel pipe, a sealing groove is arranged on the outer circle close to the upper surface of the thread, and a sealing ring is arranged in the groove and used for connecting and sealing with the high-pressure fuel pipe; the upper section of a through hole in the center of one end block is a connecting hole with internal threads, and a deflation screw is arranged in the connecting hole; the second end block is a cylinder with a through hole in the center, the inner circle in the middle section of the through hole is a thread connected with a joint at the lower end of the high-pressure oil pipe, the upper section of the through hole close to the thread is provided with a circular expanding hole, the circular expanding hole is matched and sealed with an excircle sealing groove of a connector at the lower end of the high-pressure oil pipe and a sealing ring, the wall of the circular expanding hole below the matched seal is provided with a leakage inspection hole, the lower section of the through hole is a connecting hole with internal threads, and a An Zhuangfang round gasket is arranged in the connecting hole and is communicated with a quick joint of the hydraulic pipe.

2. The marine low speed diesel high pressure fuel pipe test tool of claim 1, wherein: the An Zhuangfang round gasket in the connecting hole is communicated with the hydraulic pipe quick connector, the air release screw is arranged at a high position, and the An Zhuangfang round gasket in the connecting hole is arranged at a low position together with the hydraulic pipe quick connector; one end of the end block is connected with a high-pressure fuel pipe, and the device is arranged at two ends of the high-pressure fuel pipe; the oil inlet hole and the air vent hole are arranged on the end block, and the sizes of the holes are the same.