Jacking keeping tool for marine diesel engine exhaust valve failure

Abstract

The utility model relates to a jacking keeping tool for failure of an exhaust valve of a marine diesel engine. A mounting hole is formed in the top of the exhaust valve, and a hydraulic piston, a valve rod and a base sealing surface are arranged in the exhaust valve; the push-open retaining tool is characterized in that the push-open retaining tool is mounted in the mounting hole and comprises a body and a sealing ring; wherein the body comprises a regular hexagon head, a threaded part and an ejector rod, the regular hexagon head is located at the top and used for screwing and installing the ejection keeping tool, the threaded part is located in the middle and provided with external threads used for being connected with an installation hole, the ejector rod is located at the bottom, and the lower end of the ejector rod abuts against the hydraulic piston and pushes the valve rod through the hydraulic piston, so that the bottom of the valve rod is separated from a base sealing face; the exhaust valve is always in an exhaust state; and the sealing ring is clamped between the body and the mounting hole. The valve rod of the exhaust valve can be jacked open and kept in an open state, continuous opening of the single-cylinder exhaust valve is achieved so as to stop operation of a single cylinder, normal work of other cylinders is guaranteed, and therefore normal sailing of a ship on the sea is guaranteed.

Description

Technical Field

[0001] The utility model relates to an exhaust valve of a marine diesel engine, in particular to a tool for holding the exhaust valve of the marine diesel engine when the exhaust valve fails, and belongs to the technical field of marine diesel engines. Background Art

[0002] A leakage device is installed on the air spring pipeline of the exhaust valve of a marine low-speed diesel engine. Its function is: when the exhaust valve is working, the hydraulic oil pushes the valve stem to exhaust air, and the air enters the air cylinder of the exhaust valve to ensure that the exhaust valve stem is closed.

[0003] During the normal operation of a marine diesel engine, the exhaust valve is responsible for discharging the burned gas from the cylinder. The specific working principle is that the hydraulic oil drives the hydraulic piston inside the exhaust valve to move downward. The hydraulic piston is fixedly connected to the valve stem of the exhaust valve. When the hydraulic piston moves downward, the valve stem of the exhaust valve also moves downward, and the valve stem is disengaged from the sealing surface of the base of the exhaust valve, and then the exhaust gas is discharged.

[0004] Under certain unexpected circumstances, the hydraulic piston inside the exhaust valve may become stuck or the internal spring may fail, causing the exhaust valve to fail to work properly and thus fail to open and close normally. When this happens, ships sailing in the ocean usually take measures for the cylinder that is not working properly to stop the oil injection of the cylinder and keep the exhaust valve open, thereby ensuring that other cylinders can continue to work normally and the ship can sail normally. This requires taking necessary technical measures to ensure that the exhaust valve of the cylinder that is working abnormally can continue to open reliably. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings of the prior art and solve the problem that when a single cylinder of a ship operates abnormally during navigation, the normal operation of the main engine can still be guaranteed. A tool for holding the exhaust valve of a marine diesel engine when the exhaust valve fails is provided, which pushes open the valve stem of the exhaust valve so that the exhaust valve of the abnormal cylinder is always in an open state and the combustion chamber is always in an exhaust state, thereby ensuring the normal operation of other cylinders of the main engine and achieving the purpose of ensuring that the ship continues to sail normally.

[0006] In order to achieve the above purpose, the technical solution provided by the utility model is as follows:

[0007] A tool for opening and holding an exhaust valve of a marine diesel engine when it fails, wherein a mounting hole is provided at the top of the exhaust valve, and a hydraulic piston, a valve stem and a base sealing surface are provided inside; the characteristic is that the tool is installed in the mounting hole, and comprises a main body and a sealing ring; the main body comprises a regular hexagonal head, a threaded portion and a push rod, the regular hexagonal head is located at the top of the tool for screwing and installing the tool, the threaded portion is located in the middle of the tool, and is provided with an external thread for connecting to the mounting hole of the exhaust valve, the push rod is located at the bottom of the tool, the lower end of the tool presses the hydraulic piston and pushes the valve stem through the hydraulic piston, so that the bottom of the valve stem is separated from the base sealing surface, thereby opening the exhaust valve and keeping it in an exhaust state at all times; the sealing ring is clamped between the main body and the mounting hole.

[0008] Furthermore, the top opening and holding tool also includes a sealing portion, which is located between the regular hexagonal head and the threaded portion, and contacts the inner wall of the mounting hole of the exhaust valve to perform a sealing function. The sealing portion includes a cylindrical sealing surface, an end sealing surface and a sealing groove. The cylindrical sealing surface and the end sealing surface are in close contact with the inner wall of the mounting hole to achieve sealing. The sealing groove is arranged at the lower part of the cylindrical sealing surface to accommodate the sealing ring.

[0009] Furthermore, the cylindrical sealing surface is in sliding fit with the inner wall of the mounting hole.

[0010] Furthermore, the push rod must be long enough to push the valve stem away from the base sealing surface to open the exhaust valve.

[0011] Compared with the prior art, the utility model has achieved the following technical effects:

[0012] The push-open holding tool can push open the valve stem of the exhaust valve and keep it in an open state, so that the combustion chamber of the cylinder is always in an exhaust state, thereby achieving continuous opening of the exhaust valve of a single cylinder, while other cylinders can still operate normally.

[0013] The utility model solves the problem that a single cylinder of a main engine cannot work normally during the navigation of a ship, and stops the operation of the single cylinder by the top opening holding tool, while ensuring the normal operation of other cylinders, thereby ensuring the normal navigation of the ship at sea. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model.

[0015] Figure 2 for Figure 1 Top view of the .

[0016] Figure 3This is a usage state diagram of the utility model.

[0017] In the figure,

[0018] A—exhaust valve, A1—hydraulic piston, A2—valve stem, A3—base sealing surface, 1—body, 11—regular hexagonal head, 12—sealing part, 13—threaded part, 14—thrust rod, 15—cylindrical sealing surface, 16—end sealing surface, 17—sealing groove, 2—sealing ring. DETAILED DESCRIPTION

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention shall not be limited thereto.

[0020] The utility model is used to push open the exhaust valve and keep it in the open state when the exhaust valve of a marine diesel engine fails. Figure 3 The exhaust valve A is installed on the cylinder head, and a mounting hole connected to the hydraulic pipeline is provided on the top. A hydraulic piston A1, a valve stem A2 and a base sealing surface A3 are provided inside; the bottom of the valve stem A2 is in close contact with the base sealing surface A3, and the exhaust valve A is closed. The hydraulic piston A1 is pushed on the top of the valve stem A2 by the action of the hydraulic oil, so that the bottom of the valve stem A2 is separated from the base sealing surface A3, thereby opening the exhaust valve A and the cylinder starts to exhaust.

[0021] Please refer to Figure 1 and Figure 2 The top opening and holding tool is installed in the mounting hole at the top of the exhaust valve A, and includes a main body 1 and a sealing ring 2.

[0022] The body 1 is a bolt-shaped component, including a regular hexagonal head 11, a sealing portion 12, a threaded portion 13 and a push rod 14 connected in sequence from top to bottom. The regular hexagonal head 11 is located at the top of the push-open holding tool, and is used to screw and install the push-open holding tool. The middle part of the hexagonal head 11 is provided with an annular groove, and the annular groove is painted with red paint; the sealing portion 12 is located between the regular hexagonal head 11 and the threaded portion 13, and contacts the inner wall of the mounting hole of the exhaust valve A to play a sealing role. The sealing portion 12 includes a cylindrical sealing surface 15, an end sealing surface 16 and a sealing groove 17. The cylindrical sealing surface 15 and the end sealing surface 16 are in close contact with the inner wall of the mounting hole of the exhaust valve A to achieve sealing. The cylindrical sealing surface 15 and the end sealing surface 16 are in close contact with the inner wall of the mounting hole of the exhaust valve A to achieve sealing. The sealing surface 15 is in sliding fit with the inner wall of the mounting hole, and the sealing groove 17 is arranged at the lower part of the cylindrical sealing surface 15 for accommodating the sealing ring 2; the threaded portion 13 is located in the middle of the top-opening holding tool and is provided with an external thread for connecting to the internal thread of the inner wall of the mounting hole of the exhaust valve A; the push rod 14 is located at the bottom of the top-opening holding tool, and the lower end is pressed against the upper part of the hydraulic piston A1. The length of the push rod 14 must be long enough to be able to push the valve stem A2 so that the bottom of the valve stem A2 is separated from the base sealing surface A3 and the exhaust valve A is opened.

[0023] The sealing ring 2 is an O-type sealing ring, which is arranged in the sealing groove 17 of the sealing portion 12 of the body 1 and sandwiched between the body 1 and the mounting hole to play a sealing role.

[0024] See also Figure 3 , the working principle of the utility model is as follows:

[0025] First, the sealing ring 2 is installed into the sealing groove 17 of the sealing portion 12 of the body 1 to complete the assembly of the above-mentioned push-open holding tool, and then the push-open holding tool is screwed into the mounting hole at the top of the exhaust valve A by screwing the regular hexagonal head 11 until the lower end of the push rod 14 pushes the valve stem A2 through the hydraulic piston A1 to disengage the valve stem A2 from the base sealing surface A3, thereby opening the exhaust valve A and keeping it in the exhaust state at all times, thereby achieving the purpose of ensuring the normal operation of other cylinders of the marine diesel engine.

[0026] The protection scope of the present utility model should also include other changes and alternative technical solutions that are obvious to those skilled in the art.

Claims

1. A tool for holding a failed exhaust valve of a marine diesel engine, wherein a mounting hole is provided on the top of the exhaust valve, and a hydraulic piston, a valve stem and a base sealing surface are provided inside the exhaust valve; the characteristics are: The push-open holding tool is installed in the mounting hole, and includes a main body and a sealing ring; the main body includes a regular hexagonal head, a threaded portion and a push rod, the regular hexagonal head is located at the top of the push-open holding tool, and is used to screw and install the push-open holding tool, the threaded portion is located in the middle of the push-open holding tool, and is provided with an external thread for connecting to the mounting hole of the exhaust valve, the push rod is located at the bottom of the push-open holding tool, and the lower end presses the hydraulic piston and pushes the valve stem through the hydraulic piston, so that the bottom of the valve stem is separated from the base sealing surface, thereby opening the exhaust valve and always being in the exhaust state; the sealing ring is clamped between the main body and the mounting hole.

2. The tool for holding the exhaust valve of a marine diesel engine when it fails according to claim 1, characterized in that: The top opening and holding tool also includes a sealing portion, which is located between the regular hexagonal head and the threaded portion, and contacts the inner wall of the mounting hole of the exhaust valve to perform a sealing function. The sealing portion includes a cylindrical sealing surface, an end sealing surface and a sealing groove. The cylindrical sealing surface and the end sealing surface are in close contact with the inner wall of the mounting hole to achieve sealing. The sealing groove is arranged at the lower part of the cylindrical sealing surface to accommodate the sealing ring.

3. The tool for holding the exhaust valve of a marine diesel engine when it fails according to claim 2, characterized in that: The cylindrical sealing surface is in sliding fit with the inner wall of the mounting hole.

4. The tool for holding the exhaust valve of a marine diesel engine when it fails according to claim 1, characterized in that: The push rod must be long enough to push the valve stem away from the base sealing surface to open the exhaust valve.

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