A cylinder liner water chamber air discharging device and an engine cylinder

Abstract

The present application relates to the field of locomotive technology, and more particularly to a cylinder liner water cavity air discharge device and an engine cylinder comprising the same, wherein the cylinder liner water cavity air discharge device comprises: a cylinder liner; an engine body; a cylinder liner water cavity arranged between the cylinder liner and the engine body; and a pipe insert arranged on the engine body, one end of the pipe insert being in communication with the cylinder liner water cavity, and the other end of the pipe insert being connectable to the outside of the engine body. The cylinder liner water cavity air discharge device and the engine cylinder comprising the same can effectively discharge the gas generated during the operation of the diesel engine in time, thereby effectively reducing the cavitation erosion and prolonging the service life of the cylinder liner.

Description

Technical Field

[0001] This invention relates to the field of locomotive technology, and more particularly to a cylinder liner water chamber air exhaust device and an engine cylinder including the cylinder liner water chamber air exhaust device. Background Technology

[0002] The cylinder liner is a crucial yet easily damaged component of an engine. The upper inner surface of the cylinder liner is directly exposed to the high temperature, high pressure, and corrosion of the combustion gases. Its relative movement with the piston assembly subjects it to lateral thrust and friction. The upper outer surface of the cylinder liner forms a cooling water cavity with the inner wall of the cylinder block, making it susceptible to cavitation. Cavitation occurs primarily in two ways: first, during engine operation, the temperature of a localized area of ​​the cylinder liner exceeds the boiling point of water. Water near its boiling point produces numerous bubbles, which repeatedly impact the cylinder liner surface, causing cavitation. Second, changes in the direction and speed of the cooling water flow cause pressure variations throughout the flow path. At low-pressure areas, when the pressure is below the saturated vapor pressure of the cooling water, cavitation bubbles easily form. These bubbles are compressed and rupture in high-pressure areas of the flow path, resulting in cavitation. If cavitation cannot be effectively expelled, severe cavitation will occur, reducing the cylinder liner's lifespan.

[0003] Current technology typically exhausts air directly through the exhaust pipe, resulting in incomplete air removal. Incomplete air removal exacerbates cylinder liner cavitation, leading to severe cavitation and reducing cylinder liner lifespan.

[0004] Therefore, there is still room for improvement in existing technologies. Summary of the Invention

[0005] This application summarizes various aspects of the embodiments and should not be construed as limiting the claims. Other implementations are contemplated based on the technology described herein, as will be apparent to those skilled in the art upon studying the following drawings and detailed descriptions, and these implementations are intended to be included within the scope of this application.

[0006] This invention utilizes a method of inserting a tube inside the cylinder liner, with a carefully designed orifice diameter, to allow air to be discharged into the expansion tank via the exhaust pipe. Without affecting the cooling of the cylinder liner and cylinder head, air sequentially passes through the insert, a bore in the engine block, a connector, and the exhaust pipe to reach the expansion tank, discharging gases generated during diesel engine operation. This effectively reduces cavitation erosion and extends the service life of the cylinder liner.

[0007] Specifically, according to one aspect of the present invention, a cylinder liner water chamber air exhaust device is provided, comprising: a cylinder liner; an engine body; a cylinder liner water chamber disposed between the cylinder liner and the engine body; and a tube disposed on the engine body, one end of the tube communicating with the cylinder liner water chamber, and the other end of the tube being connectable to the outside of the engine body.

[0008] In an embodiment of the invention, the insert is located at the top of the cylinder liner water chamber, and the cylinder liner water chamber air exhaust device further includes a dead zone located at the top and between the cylinder liner and the engine block.

[0009] In an embodiment of the invention, the inner diameter of the insert is determined at least based on the volume of the dead zone, the cross-sectional area of ​​the dead zone, and the coolant flow rate in the cylinder liner water chamber.

[0010] In embodiments of the present invention, the volume is determined at least based on the height of the dead zone, the outer diameter of the cylinder liner, and the inner diameter of the cylinder liner mounting hole of the engine block.

[0011] In an embodiment of the invention, the inner diameter of the insert is further determined based on the exhaust time of the cylinder liner water chamber and the start-up time of the diesel engine.

[0012] In an embodiment of the present invention, the exhaust time of the cylinder liner water chamber and the start-up time of the diesel engine satisfy the following formula:

[0013]

[0014] Wherein, t1 represents the exhaust time of the cylinder liner water chamber, t represents the start-up time of the diesel engine, d represents the inner diameter of the insert, D represents the inner diameter of the cylinder liner mounting hole of the engine body, D1 represents the outer diameter of the cylinder liner, h1 represents the height of the dead zone, v represents the flow rate of the coolant in the cylinder liner water chamber, s represents the cross-sectional area of ​​the dead zone, and V represents the volume of the dead zone.

[0015] In an embodiment of the present invention, the inner diameter of the insert is determined based on the following formula:

[0016]

[0017] In an embodiment of the present invention, the cylinder liner water chamber air exhaust device further includes a drilled hole disposed in the engine body, a connector located outside the engine body and connected to the drilled hole, an exhaust pipe connected to the connector, and an expansion tank connected to the exhaust pipe. The second end of the insert is connected to the drilled hole and is connected to the expansion tank outside the engine body through the drilled hole, the connector, and the exhaust pipe.

[0018] In an embodiment of the present invention, the insert is spaced a predetermined distance from the cylinder head located above the cylinder liner.

[0019] According to another aspect of the present invention, an engine cylinder is provided including a cylinder liner water chamber air exhaust device, wherein the cylinder liner water chamber air exhaust device may be the cylinder liner water chamber air exhaust device as described above.

[0020] Compared with conventional diesel engine air emission devices, the cylinder liner water chamber air emission device and the engine cylinder including the cylinder liner water chamber air emission device provided by this invention can effectively and timely discharge the gas generated during the operation of the diesel engine, thereby effectively reducing cavitation and extending the service life of the cylinder liner.

[0021] Upon studying the following description, claims and drawings, those skilled in the art will understand and recognize these and other aspects, objects and features of this disclosure. Attached Figure Description

[0022] To gain a more complete understanding of the embodiments of this application, reference should be made to the embodiments described in more detail in the accompanying drawings and by way of example below, wherein:

[0023] Figure 1 This is a schematic diagram of the structure of a cylinder liner exhaust device in the prior art;

[0024] Figure 2 This is a schematic diagram of the structure of the cylinder liner water chamber air emission device provided in an embodiment of the present invention;

[0025] Figure 3 for Figure 2 An enlarged view of the circled portion. Detailed Implementation

[0026] The following describes embodiments of the present disclosure. However, it should be understood that the disclosed embodiments are merely examples, and other embodiments may take various alternative forms. The drawings are not necessarily drawn to scale; certain functions may be exaggerated or minimized to show details of particular components. Therefore, the specific structural and functional details disclosed herein should not be construed as limiting, but merely as a representative basis for teaching those skilled in the art to use the application in various ways. As those skilled in the art will understand, various features shown and described with reference to any of the drawings may be combined with features shown in one or more other drawings to produce embodiments not explicitly shown or described. The combinations of features shown provide representative embodiments for typical applications. However, various combinations and modifications of features consistent with the teachings of this disclosure may be desirable for certain particular applications or implementations.

[0027] Furthermore, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or action from another, and do not necessarily require or imply any actual such relationship or order between these entities or actions. The terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements may include not only those elements but also elements not expressly listed or inherent to such processes, methods, articles, or apparatuses.

[0028] refer to Figure 1 There is a dead zone at the top between the engine block and the cylinder liner, preventing gas from escaping. Typically, an exhaust port is located on the cylinder head above the cylinder liner, corresponding to the position of the dead zone (i.e., Figure 1 The original cylinder head exhaust port was used, but such an exhaust port still had poor exhaust effect, resulting in severe cavitation and reducing the service life of the cylinder liner.

[0029] Based on this, the present invention provides a cylinder liner water chamber air venting device, such as... Figure 2 and 3 As shown, it includes: a cylinder liner 10; an engine block 20; a cylinder liner water chamber 30 disposed between the cylinder liner 10 and the engine block 20; and a bushing 40 disposed on the engine block 20, one end of which communicates with the cylinder liner water chamber 30, and the other end of which can be connected to the outside of the engine block 20. By setting the bushing 40 and controlling its orifice diameter (or inner diameter), the gas generated during the operation of the diesel engine can be discharged in a timely and effective manner, reducing the impact of cavitation erosion, thereby improving the service life of the cylinder liner.

[0030] In an embodiment of the invention, the insert 40 is located at the top of the cylinder liner water chamber 30, and the cylinder liner water chamber air exhaust device further includes a dead zone located at the top and between the cylinder liner 10 and the engine block 20, the dead zone having a height h1 (reference). Figure 1 (As shown). The insert 40 can be placed in the dead zone to allow gas to escape.

[0031] In an embodiment of the invention, the inner diameter of the insert 40 is determined at least based on the volume V of the dead zone, the cross-sectional area s of the dead zone, and the coolant flow velocity v in the cylinder liner water chamber 30.

[0032] In embodiments of the present invention, the volume V is determined at least based on the height h1 of the dead zone, the outer diameter D1 of the cylinder liner 10, and the inner diameter D of the cylinder liner mounting hole of the engine block 20.

[0033] In an embodiment of the present invention, the dead zone volume can be calculated using the following formula three:

[0034]

[0035] Where V represents the volume of the dead zone, D represents the inner diameter of the cylinder liner mounting hole of the engine body, D1 represents the outer diameter of the cylinder liner, and h1 represents the height of the dead zone.

[0036] In embodiments of the present invention, the inner diameter d of the insert 40 (also referred to as the minimum aperture of the insert 40) is further determined based on the exhaust time t1 of the cylinder liner water chamber 30 and the start-up time t of the diesel engine. The engine block 20 and the top of the cylinder liner 10 bear the reciprocating inertial force of the power unit, the explosion pressure of the gas, thermal stress, etc., so the smaller the aperture d of the insert 40, the smaller the impact on the strength of the engine block 20 and the cylinder liner 10.

[0037] In an embodiment of the present invention, the exhaust time t1 of the cooling water chamber is less than the start-up time t of the diesel engine.

[0038] In an embodiment of the present invention, the exhaust time t1 of the cylinder liner water chamber 30 and the start-up time t of the diesel engine satisfy the following formula:

[0039]

[0040] Where t1 represents the exhaust time of the cylinder liner water chamber, t represents the start-up time of the diesel engine, d represents the inner diameter of the insert, D represents the inner diameter of the cylinder liner mounting hole in the engine block, D1 represents the outer diameter of the cylinder liner, h1 represents the height of the dead zone, v represents the coolant flow rate in the cylinder liner water chamber, s represents the cross-sectional area of ​​the dead zone, and V represents the volume of the dead zone. The coolant flow rate v can be close to the water pump flow rate.

[0041] In an embodiment of the present invention, the inner diameter of the insert is determined based on the following formula:

[0042]

[0043] According to Formula 2 above, the lower limit of the inner diameter of the insert 40 can be calculated, and an insert with a suitable inner diameter can be selected based on this, thereby achieving the effect described in this invention.

[0044] In embodiments of the present invention, such as Figure 2 and 3 As shown, the cylinder liner water chamber air venting device further includes a drilled hole 21 disposed within the engine block 20, a connector 23 located outside the engine block 20 and connected to the drilled hole 20, an exhaust pipe 25 connected to the connector 23, and an expansion tank 27 connected to the exhaust pipe 25. The second end of the insert 40 is connected to the drilled hole 21 and is connected to the expansion tank 27 outside the engine block 20 through the drilled hole 21, the connector 23, and the exhaust pipe 25 to vent the gas inside the cylinder water chamber 30 within the engine block 20. In one embodiment, the connector 23 may be a quick-connect connector for easy installation.

[0045] In an embodiment of the present invention, the insert 40 is spaced a predetermined distance from the cylinder head 60 located above the cylinder liner 10.

[0046] According to another aspect of the present invention, an engine cylinder is provided that includes a cylinder liner water chamber air exhaust device, wherein the cylinder liner water chamber air exhaust device may be the cylinder liner water chamber air exhaust device described in the foregoing embodiments.

[0047] The present invention is further illustrated below through specific embodiments:

[0048] The specific parameters of a certain type of diesel engine are as follows:

[0049] ρ=1.05g / cm 3 ;

[0050] h = 1250 mm;

[0051] h1 = 22.4 mm;

[0052] D = 215 mm;

[0053] D1 = 207;

[0054] t < 5s;

[0055] v = 3.5 m / s.

[0056]

[0057]

[0058]

[0059] choose The standard pipe is used for pipe fitting, and the inner diameter d of the pipe is... The exhaust time t1 is:

[0060]

[0061] t1 < t.

[0062] By selecting the inner diameter of the inlet pipe using the above method, the calculated exhaust time t1 is 2.4s, which is less than the diesel engine start-up time of 5s.

[0063] This application is intended to illustrate how the disclosed technology and various embodiments can be used, and is not intended to limit its true scope and equivalent spirit and meaning. Furthermore, the foregoing description is not exhaustive of all possibilities or to limit the scope of protection to the precise forms disclosed. Changes and variations are possible in accordance with the foregoing teachings. The selected and illustrated embodiments provide the best illustration of the principles of the technology and its practical application, and enable those skilled in the art to use the disclosed technology for various conceivable specific applications with various modifications. Therefore, various changes and modifications made to the above embodiments without substantially departing from the spirit and principles of the technology described herein are intended to be included within the scope of this disclosure.

Claims

1. A cylinder liner water chamber air discharge device, characterized in that, include: Cylinder liner; Organism; The cylinder liner water chamber is disposed between the cylinder liner and the engine block; The dead zone between the cylinder liner and the engine block; as well as A tube is installed on the engine block, one end of which communicates with the cylinder liner water chamber, and the other end of which can be connected to the outside of the engine block. The exhaust time of the cylinder liner water chamber and the start-up time of the diesel engine satisfy the following formula: <t Formula 1 Wherein, t1 represents the exhaust time of the cylinder liner water chamber, t represents the start-up time of the diesel engine, d represents the inner diameter of the insert, D represents the inner diameter of the cylinder liner mounting hole of the engine body, D1 represents the outer diameter of the cylinder liner, h1 represents the height of the dead zone, v represents the flow rate of the coolant in the cylinder liner water chamber, s represents the cross-sectional area of ​​the dead zone, and V represents the volume of the dead zone.

2. The cylinder liner water chamber air discharge device according to claim 1, characterized in that, The inner diameter of the inlaid tube is determined based on the following formula: Formula 2.

3. The cylinder liner water chamber air discharge device according to claim 1, characterized in that, The insert and the dead zone are located at the top of the cylinder liner water chamber.

4. The cylinder liner water chamber air venting device according to claim 1, characterized in that, The device further includes a drilled hole disposed within the body, a connector located outside the body and connected to the drilled hole, an exhaust pipe connected to the connector, and an expansion tank connected to the exhaust pipe. The second end of the insert is connected to the drilled hole and is connected to the expansion tank outside the body through the drilled hole, the connector, and the exhaust pipe.

5. The cylinder liner water chamber air discharge device according to claim 1, characterized in that, The insert is spaced a predetermined distance from the cylinder head located above the cylinder liner.

6. An engine cylinder including a cylinder liner water chamber air exhaust device, characterized in that, The cylinder liner water chamber air exhaust device is the cylinder liner water chamber air exhaust device described in any one of claims 1-5.

Images