- 1 Cylinder Liner Support Structure for High-Speed Marine Diesel Engines Technical Field The present invention relates to the field of engines, in particular to a cylinder 5 liner support structure for a high-speed marine engine. Description of the Related Art At present, the cylinder liner support structures of the traditional large-power high-speed marine diesel engines have large, heavy, loose and complicated structures, need many parts and are inconvenient to produce, assemble, install 10 and maintain. In addition, the overlarge cylinder liner support structure also leads to a decline in the integral rigidity and bearing capacity of the cylinder body, which is easy to cause deformation to the cylinder body and vibration to the whole machine, and also affects the location and sealing of the cylinder liner. 15 Summary the Present Invention The object of the present invention is to overcome the defects in the prior art by providing a cylinder liner support structure of a high-speed marine diesel engine, which have simple and compact structure, has high rigidity, light weight and a small size, thus facilitating service and maintenance. 20 To this end, the present invention provides a cylinder liner support structure of a high-speed diesel engine, which comprises: a cylinder liner mounting hole; a water jacket chamber disposed on the top of the cylinder liner mounting hole; a rectangular-wave cylinder liner support structure and a cylinder liner through-hole. 25 The cylinder liner through-hole is divided into three parts, namely from the top down, a first cylinder liner through-hole, a second cylinder liner through-hole -2 and a third cylinder liner through-hole. The rectangular-wave cylinder liner support structure is divided into two layers, and the first cylinder liner through-hole is located at the lower part of the wave jacket chamber. A first layer of the rectangular-wave cylinder liner support structure is disposed 5 between the first cylinder liner through-hole and the second cylinder liner through-hole; and a second layer of rectangular-wave cylinder liner support structure is disposed between the second cylinder liner through-hole and the third cylinder liner through-hole. In a preferred embodiment, the rectangular-wave cylinder liner support structure 10 is a frame which retracts relative to the inner wall in a lengthwise direction of the cylinder liner mounting hole, and the frame forms a support space therein. In a preferred embodiment, the rectangular-wave cylinder liner support structure comprises rectangular-wave structure transverse edges, rectangular-wave structure longitudinal edges, and a circular arc support face connecting the 15 adjacent rectangular rectangular-wave structure transverse edges. In a preferred embodiment, the rectangular-wave cylinder liner support structure is also provided with reinforcing ribs. In a preferred embodiment, the reinforcing ribs are shaped into a right triangle. Compared with the conventional cylinder liner support structure, the cylinder 20 liner support structure according to the present invention has the following beneficial effects: the cylinder liner structure of the high-speed marine diesel engine has a simple and compact structure and high rigidity and prevents the cylinder liner from deformation during operation. The cylinder liner structure of the high-speed marine diesel engine of the present invention is light weighted, 25 has a small size, and has low vibrations across the entire machine, which leads to low noises and facilitates the positioning, sealing and maintenance of the cylinder liner, thus can improve the overall rigidity and bearing capability of the cylinder body and avoid deformation of the cylinder block and vibration of the -3 whole machine caused by high-load operations. The present invention will be further described through the following embodiments and the accompanying drawings. Description of The Accompanying Drawings 5 The invention will now be described in a non-limiting way with reference to the drawing in which like parts have like reference symbols, and in which: Figure 1 is a schematic view of a cylinder liner support structure of the high-speed marine diesel engine of the present invention. Figure 2 is a sectional view of figure 1 in the A-A direction. 10 Figure 3 is a schematic view of the cylinder liner support structure of the high-speed marine diesel engine of the present invention in the service state. Description of the reference numbers shown in the drawings: 1-Cylinder block main body 15 2-Cylinder liner mounting hole 3-Water jacket chamber 4-Rectangular-wave cylinder liner support structure 41-Rectangular-wave structure transverse edge 42-Rectangular-wave longitudinal edge 20 43-Circular arc support face 44-Reinforcing rib 51-First cylinder liner through-hole 52-Second cylinder liner through-hole -4 53-Third cylinder liner through-hole 6-Cylinder liner Detailed Description of the Present Invention A preferred embodiment of the present invention is described in detail with 5 reference to the attached drawings. However, it should be understood that the protective scope of the present invention is not limited by the embodiment. The cylinder liner structure of the high-speed marine diesel engine has a simple and compact structure and high rigidity and prevents the cylinder liner from deformation during operation. The cylinder liner structure of the high-speed 10 marine diesel engine of the present invention is light weighted, has a small size, and has low vibrations across the entire machine, which leads to low noises and facilitates the positioning, sealing and maintenance of the cylinder liner, thus can improve the overall rigidity and bearing capability of the cylinder body and avoid deformation of the cylinder block and vibration of the whole machine 15 caused by high-load operations. As shown in Figure 1 and Figure 2, the specific structure of the cylinder liner support structure of the high-speed marine diesel engine comprises a cylinder liner mounting hole 2 disposed in the cylinder block main body 1. Further, the cylinder liner support structure according to the present invention also includes 20 the a water jacket chamber 3, a rectangular-wave cylinder liner support structure 4 and a cylinder liner through-hole which are spaced on the circumference of the cylinder liner mounting hole 2, and the cylinder liner mounting hole 2 is used to install the cylinder liner. The water liner chamber 3 is used to cool the cylinder liner. The rectangular-wave cylinder liner support structure 4 retracts inwardly 25 along the inner wall of the cylinder liner inner wall, and is spaced apart from the cylinder liner through-hole in the length direction of the cylinder liner mounting hole, so the cylinder liner has proper support at a certain interval in the length direction of the entire cylinder liner mounting hole. Thus, the cylinder liner -5 support structure of the high-speed marine diesel engine has high rigidity, and the cylinder liner does not deform when in operation. The cylinder liner support structure of the high-speed marine diesel engine has a light weight, a small size, and has low vibrations across the entire machine, thus facilitating the 5 positioning, sealing and maintenance of the cylinder liner, and can improve the overall rigidity and bearing capability of the cylinder block and avoid the deformation of the cylinder block and the vibration of the entire machine caused by high-load operations. The water jacket chamber is disposed on the top of the cylinder liner mounting 10 hole 2 for cooling the cylinder liner. The cylinder liner through-hole is closely attached to the outer wall of the cylinder liner, divided into three parts, namely a first cylinder liner through-hole 51, a second cylinder liner through-hole 52 and a third cylinder liner through-hole 53 from the top down; and the rectangular-wave cylinder liner support structure 4 is divided into two layers. 15 Specifically, the first cylinder liner through-hole 51 is located at the lower part of the water jacket chamber 3; the first layer of the rectangular-wave cylinder liner support structure 4 is disposed at the lower part of the first cylinder liner through-hole 51. The lower part of the first layer of rectangular-wave cylinder liner support structure 4 is the second cylinder liner through-hole 52; the second 20 layer of rectangular-wave cylinder liner support structure 4 is disposed at the lower part of the second cylinder liner through-hole 52; the third cylinder liner through-hole 53 is located at the lower part of the second layer of rectangular-wave cylinder liner support structure 4, which means that the first layer of rectangular-wave cylinder liner support structure 4 is disposed between 25 the first cylinder liner through-hole 51 and the second cylinder liner through-hole 52, and the second layer of rectangular-wave cylinder liner support structure 4 is disposed between the second cylinder liner through-hole 52 and the third cylinder liner through-hole 53. The rectangular-wave cylinder liner support structure 4 forms a frame that -6 retracts inward relative to the inner wall along the lengthwiese direction of the cylinder liner mounting hole. The frame forms a support space therein and comprises rectangular-wave structure transverse edges 41, rectangular-wave structure longitudinal edges 42, and a circular arc support face 43 connecting the 5 adjacent rectangular rectangular-wave structure transverse edges 41. Meanwhile, the rectangular-wave cylinder liner support structure has reinforcing ribs 44 for strengthening, and the reinforcing ribs 44 constitute a right-angle triangle. Therefore, the cylinder liner has multiple supports at a proper interval in the length direction of the entire cylinder liner mounting hole. Due to the 10 rectangular-wave cylinder liner support structure 4, the cylinder liner support structure of the high-speed marine diesel engine has high rigidity, and the cylinder liner does not deform when in operation. The rectangular-wave cylinder liner support structure also reduces the weight, so the cylinder liner support structure of the high-speed marine diesel engine has a light weight a small size; 15 moreover, the rectangular-wave structure transverse edges 41 and rectangular-wave structure longitudinal edges 42 can prevent the cylinder liner mounting hole 2 and the cylinder from resonating, thus reducing the vibration amplitude and noises of the entire machine and facilitating the positioning, sealing and maintenance of the cylinder liner. Wherein, the ratio of the frame 20 width X of the rectangular-wave cylinder liner support structure 4 to the diameter D of the cylinder liner mounting hole 2 is in the range of 0.75-0.85; the ratio of the thickness Y of the rectangular-wave structure transverse edges 41 to the frame width X of the rectangular-wave cylinder liner support structure 4 is in the range of 0.06-0.07; and the ratio of the frame width R of the circular arc 25 support surface 43 to the frame width X of the rectangular-wave cylinder liner support structure 4 is in the range of 0.65-0.75. As shown in the Figure 3, the cylinder liner 6 is installed in the cylinder liner mounting hole 2. The cylinder liner through-hole is closely attached to the outer wall of the cylinder liner, and is spaced apart from the rectangular-wave cylinder -7 liner support structure 4 in the length direction of the cylinder liner mounting hole. Therefore, the cylinder liner has multiple supports at a proper interval in the length direction of the entire cylinder liner mounting hole, the cylinder liner support structure of the high-speed marine diesel engine has high rigidity, and 5 the cylinder liner does not deform when working. All in all, the cylinder liner structure of the high-speed marine diesel engine has a simple and compact structure and high rigidity and prevents the cylinder liner from deformation during operation. The cylinder liner structure of the high-speed marine diesel engine of the present invention is light weighted, has a 10 small size, and has low vibrations across the entire machine, which leads to low noises and facilitates the positioning, sealing and maintenance of the cylinder liner, thus can improve the overall rigidity and bearing capability of the cylinder body and avoid deformation of the cylinder block and vibration of the whole machine caused by high-load operations. 15 The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teachings. The exemplary embodiments were chosen and 20 described in order to explain certain principles of the invention. It is intended that the scope of the invention be defined by the Claims appended hereto and their equivalents.