Heat insulation method for ventilation tank of cooling water system of low-speed diesel engine

Abstract

According to the heat insulation method for the ventilation tank of the cooling water system of the low-speed diesel engine, a metal heat insulation net plate is adopted, a heat insulation protection plate is manufactured according to the appearance of the ventilation tank and arranged on the periphery of the ventilation tank in a surrounding mode to achieve the protection effect, and a necessary gap is formed between the heat insulation protection plate and the outer surface of the ventilation tank; heat dissipation of the ventilation tank and observation of leakage faults are facilitated; wherein the heat insulation protection plate is made of a metal net plate, meshes are densely distributed on the heat insulation protection plate, a plurality of bolt holes are formed in the heat insulation protection plate, the appearance of the heat insulation protection plate is cut according to the appearance of the ventilation tank, accessories on the ventilation tank are avoided, and screw hole columns corresponding to the bolt holes in position are welded to the ventilation tank. The height is determined according to a necessary gap between the outer surface of the ventilation tank and the heat insulation protection plate, and the heat insulation protection plate is connected to the periphery of the ventilation tank through fixing bolts and keeps a necessary gap with the outer surface of the ventilation tank. According to the invention, the closed insulation coating is changed into the open heat insulation screen plate, so that the effects of preventing personnel from being burnt, timely dissipating heat to protect the tank body, improving the observability and prolonging the service life are achieved, and the device has the advantages of convenience in disassembly and assembly and reusability.

Description

Technical Field

[0001] The invention relates to a cooling water system of a low-speed marine diesel engine, in particular to a heat insulation method for a breather tank of the low-speed diesel engine cooling water system, belonging to the technical field of marine diesel engines. Background Art

[0002] See also Figure 1 The cylinder head cooling water system of an existing low-speed diesel engine includes an inlet pipe A, an outlet pipe B, a drain pipe C, a connected cylinder head G1 and cylinder liner G2, a throttle orifice 2, a breather tank 4, and an automatic breather valve 6. The inlet pipe A is connected to the cylinder liner G2 and the cylinder head G1 in sequence through the inlet valve 1 on the branch pipe. The upstream of the throttle orifice 2 is connected to the cylinder head G1, and the downstream is connected to the breather tank 4 through the outlet valve 3. The breather tank 4 is connected to the outlet pipe B, and one end is connected to the automatic breather valve 6 through the control valve 5, and the other end is connected to the drain pipe C through the drain valve 10. The upstream of the automatic breather valve 6 is connected to a residual valve 7, and the downstream is connected to the drain pipe C. The upstream of the cylinder liner G2 is connected to the drain pipe C through a first drain valve 9, and the downstream of the throttle orifice 2 is connected to the drain pipe C through a second drain valve 8.

[0003] The principle of the above cooling water system is as follows: Please refer to Figure 1 When the main engine is started, cooling water containing water and air enters the water inlet main A at a pressure of 6 to 8 bar, enters the cylinder liner G2 for cooling through the water inlet valve 1 (normally open, closed when the engine is shut down and the water is discharged), and then flows into the cylinder head G1 for cooling. It enters the water outlet branch through the throttle plate 2 (the function of which is to maintain a certain pressure so that the cavities of the cylinder head G1 and the cylinder liner G2 can be fully cooled), and flows through the water outlet valve 3 (normally open, closed when the engine is shut down and the water is discharged) to the water outlet main B, and then enters the breather tank 4; after flowing out of the breather tank 4, the cooling water flows to the shipyard in one direction, and is ventilated through the control valve 5 (normally open, closed when the engine needs to be shut down and the residual gas is discharged) and the automatic breather valve 6 (automatically opens when the pressure reaches 14 bar). The air is sprayed into the discharge main C through the breather pipeline and flows out. When the main engine is shut down, the water inlet valve 1 and the water outlet valve 3 are closed, the first discharge valve 9 on the water inlet branch pipe and the second discharge valve 8 on the water outlet branch pipe are opened, and the residual water in the cylinder head G1 and the cylinder liner G2 are collected and flow out to the discharge main pipe C; the residual valve 7 is opened, and the water vapor is directly discharged into the atmosphere; when the residual water in the breather tank 4 needs to be emptied, open the drain valve 10 under the tank body (normally closed, used when draining water); during maintenance, the residual valve 7 is manually opened to discharge the air mixed in the cooling water, and the automatic breather valve 6 is used to automatically drain the residual cooling water.

[0004] The function of the breather tank 4 on the cooling water system pipeline of the above-mentioned marine low-speed diesel engine is to promptly discharge the air brought into the cooling water so that a sufficient amount of cooling water can fill the pipeline to achieve the cooling effect on the cylinder liner G2 and cylinder head G1. The high-temperature cooling water flowing out of the cylinder head G1 raises the surface temperature of the breather tank 4 to 85℃~90℃. Figure 2 In order to prevent personnel from being burned, the surface of the breathable tank 4 is wrapped with an insulation layer 40; the material of the insulation layer 40 is usually tinplate + rock wool, and the coating form is directly fixed to the surface of the breathable tank 4 with rivets, and it cannot be removed after completion.

[0005] However, the thermal insulation layer of the above-mentioned existing breathable tank has the following defects: first, the water temperature in the tank body cannot be dissipated, and the tank body is in a high temperature and high pressure state for a long time, which shortens the service life; second, if a small amount of water vapor leaks out of the tank body, it will not be observed and discovered in time due to the tight covering on the outer surface; in addition, if a large amount of water vapor leaks out and soaks the material of the thermal insulation layer, it cannot be used again after removal; finally, the traditional thermal insulation layer has the disadvantages of long production time and cumbersome coating process. Summary of the Invention

[0006] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide an insulation method for a breathable tank of a low-speed diesel engine cooling water system, in which the closed, wrapped insulating layer is replaced with an open thermal insulation guard plate, which is surrounded by the breathable tank, so as to achieve the effects of easy disassembly and assembly, reusability, improved observable performance and extended service life.

[0007] To achieve the above objectives, the technical solutions of the present invention are as follows:

[0008] A heat insulation method for a breather tank in a cooling water system of a low-speed diesel engine, comprising: a heat-insulating mesh made of metal, and a heat-insulating guard plate made according to the shape of the breather tank, which is placed around the periphery of the breather tank to provide protection; and a necessary gap is provided between the heat-insulating guard plate and the surface of the breather tank to facilitate heat dissipation of the breather tank and observation of leakage faults.

[0009] Furthermore, the heat-insulating guard plate is made of a metal mesh plate, which is densely covered with mesh holes, and its shape is cut according to the appearance of the breathable tank to avoid the accessories on the breathable tank.

[0010] Furthermore, a plurality of screw hole columns are welded on the outer surface of the breathable tank, and the heat insulation guard plate is fixedly connected to the outer periphery of the breathable tank through the screw hole columns and fixing bolts.

[0011] Furthermore, the heat-insulating guard plate is provided with a plurality of bolt holes for inserting the fixing bolts, and the positions thereof correspond to the screw hole columns on the breathable tank.

[0012] Furthermore, the height of the screw hole column is determined according to the necessary gap between the outer surface of the breathable tank and the heat insulation shield.

[0013] Furthermore, the heat insulation method comprises the following steps:

[0014] 1) Cutting a metal mesh according to the outer shape of the breathable tank so that the outer shape avoids the accessories on the breathable tank to form a heat insulation shield, and drilling a plurality of fixing bolt holes on the heat insulation shield;

[0015] 2) Welding a plurality of screw hole columns on the outer surface of the breathable tank, the positions of which correspond to the bolt holes on the thermal insulation shield;

[0016] 3) The heat-insulating guard plate is connected and fixed to the screw hole column of the breathable tank by fixing bolts, and a necessary gap is maintained between the heat-insulating guard plate and the outer surface of the breathable tank.

[0017] Furthermore, in the step 2), the height of the screw hole column is determined according to the necessary gap between the outer surface of the breathable tank and the thermal insulation shield.

[0018] Compared with the prior art, the present invention achieves the following beneficial effects:

[0019] 1. A heat-insulating protective plate is added to the outer periphery of the breathable tank, which has heat insulation and protection functions, achieving a safety protection effect to prevent people from being burned.

[0020] 2. There is a gap between the thermal insulation plate and the surface of the breathable tank. On the one hand, it is beneficial to the heat dissipation of the breathable tank, reducing the temperature of the cooling water in the tank and extending the service life of the tank. On the other hand, it improves the observability performance, making it easier for maintenance personnel to find out whether there is leakage in the tank in time, thereby achieving the purpose of making fault prediction in advance.

[0021] 3. The thermal insulation guard plate has been changed from tinplate + rock wool to metal mesh steel material, which extends its service life.

[0022] 4. The assembly process is changed from a closed and wrapped insulating layer to an open insulating guard plate, which is installed on the outside of the tank through a detachable connection with bolts. It is not only easy to manufacture and disassemble, but also reusable, reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the schematic diagram of the traditional cylinder head cooling water system.

[0024] Figure 2 It is a schematic diagram of the thermal insulation device of the existing breathable tank.

[0025] Figure 3 Schematic diagram of the present invention.

[0026] Figure 4This is the expanded view of the thermal insulation panel.

[0027] In the figure,

[0028] 1—water inlet valve, 2—throttling orifice, 3—water outlet valve, 4—vent tank, 5—control valve, 6—automatic vent valve, 7—residual discharge valve, 8—second relief valve, 9—first relief valve, 10—water discharge valve, 40—thermal insulation layer, 41—thermal insulation guard plate, 42—fixing bolt, 43—mesh, 44—bolt hole, A—water inlet main pipe, B—water outlet main pipe, C—discharge main pipe, G1—cylinder head, G2—cylinder liner. DETAILED DESCRIPTION

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, the following embodiments are not intended to limit the scope of implementation of the present invention. Any equivalent replacements and modifications made based on the contents of this specification should fall within the scope of protection claimed by the present invention.

[0030] The present invention is used for heat insulation treatment of a breathable tank of a cooling water system of a low-speed diesel engine; a metal heat-insulating mesh plate is made into a heat-insulating guard plate according to the shape of the breathable tank, and is placed around the outer periphery of the breathable tank to play a protective role; and a necessary gap is set between the heat-insulating guard plate and the outer surface of the breathable tank to facilitate heat dissipation of the breathable tank and observation of leakage faults.

[0031] See also Figure 4 The thermal insulation guard plate 41 is made of a metal mesh purchased from the market, which is densely covered with mesh holes 43. The shape is cut according to the appearance of the breathable tank 4 to avoid the accessories on the breathable tank 4. A plurality of bolt holes 44 are opened on the thermal insulation guard plate 41 for installing the thermal insulation guard plate 41 on the breathable tank 4.

[0032] The outer surface of the breathable tank 4 is welded with a plurality of screw holes for connecting the fixing bolts 42 and forming the necessary gap between the heat insulation plate 41 and the outer surface of the breathable tank 4. Figure 3 The positions of the multiple screw hole columns correspond to the bolt holes 44 on the thermal insulation shield 41. The thermal insulation shield 41 is fixed to the outer periphery of the breathable tank 4 through the screw hole columns and fixing bolts 42. The height of the screw hole columns is determined according to the required clearance between the outer surface of the breathable tank 4 and the thermal insulation shield 41.

[0033] Please refer to Figure 3 and Figure 4 The heat insulation method for the breather tank of the cooling water system of a low-speed diesel engine comprises the following steps:

[0034] 1) Cut the metal mesh according to the outer shape of the breathable tank 4, and avoid the accessories on the breathable tank 4. Figure 4, making a heat insulation shield 41, and drilling a plurality of fixing bolt holes 44 on the heat insulation shield 41;

[0035] 2) Welding a plurality of screw holes on the outer surface of the breathable tank 4. The height of the screw holes is determined according to the required clearance between the outer surface of the breathable tank 4 and the thermal insulation shield 41, and the position of the screw holes corresponds to the bolt holes 44 on the thermal insulation shield 41;

[0036] 3) The heat-insulating shield 41 is connected and fixed to the screw hole column of the breathable tank 4 by means of the fixing bolts 42 , and a necessary gap is maintained between the heat-insulating shield 41 and the outer surface of the breathable tank 4 .

[0037] The present invention changes the closed insulating covering into an open thermal insulation mesh panel, thereby preventing burns to personnel, dissipating heat at any time to protect the tank body, improving observable performance, and extending service life. It has the advantages of easy disassembly and assembly and reusability.

[0038] The above are only preferred embodiments of the present invention and are not intended to limit the scope of the present invention. That is, all equivalent changes and modifications made based on the contents of the present invention should fall within the technical scope of the present invention.

Claims

1. A heat insulation method for a vent tank in a low-speed diesel engine cooling water system, characterized by: A heat-insulating mesh plate made of metal is made into a heat-insulating guard plate according to the shape of the breathable tank and is placed around the outer periphery of the breathable tank to play a protective role. A necessary gap is set between the heat-insulating guard plate and the surface of the breathable tank to facilitate the heat dissipation of the breathable tank and the observation of leakage faults.

2. The heat insulation method for the vent tank of the cooling water system of a low-speed diesel engine according to claim 1, characterized in that: The heat-insulating guard plate is made of a metal mesh plate with dense mesh holes. The shape is cut according to the appearance of the breathable tank to avoid the accessories on the breathable tank.

3. The heat insulation method for a vent tank of a low-speed diesel engine cooling water system according to claim 1 or 2, characterized in that: A plurality of screw hole columns are welded on the outer surface of the breathable tank, and the heat insulation guard plate is fixedly connected to the outer periphery of the breathable tank through the screw hole columns and fixing bolts.

4. The heat insulation method for the vent tank of the cooling water system of a low-speed diesel engine according to claim 3, characterized in that: The heat-insulating guard plate is provided with a plurality of bolt holes for inserting the fixing bolts, and the positions thereof correspond to the screw hole columns on the breathable tank.

5. The heat insulation method for the vent tank of the cooling water system of a low-speed diesel engine according to claim 3, characterized in that: The height of the screw hole column is determined according to the necessary gap between the outer surface of the required breathable tank and the heat insulation shield.

6. The heat insulation method for the vent tank of the cooling water system of a low-speed diesel engine according to claim 1, characterized in that: The heat insulation method comprises the following steps: 1) Cutting a metal mesh according to the outer shape of the breathable tank so that the outer shape avoids the accessories on the breathable tank to form a heat insulation shield, and drilling a plurality of fixing bolt holes on the heat insulation shield; 2) Welding a plurality of screw hole columns on the outer surface of the breathable tank, the positions of which correspond to the bolt holes on the thermal insulation shield; 3) The heat-insulating guard plate is connected and fixed to the screw hole column of the breathable tank by fixing bolts, and a necessary gap is maintained between the heat-insulating guard plate and the outer surface of the breathable tank.

7. The heat insulation method for the vent tank of the cooling water system of a low-speed diesel engine according to claim 6, characterized in that: In the step 2), the height of the screw hole column is determined according to the necessary gap between the outer surface of the breathable tank and the thermal insulation shield.

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