Flywheel protection device of low-speed diesel engine

Abstract

The invention relates to the technical field of diesel engines, in particular to a low-speed diesel engine flywheel protection device which comprises a protection cover fixedly arranged on the end face of a crankcase and used for completely wrapping a flywheel inside, a water cooling assembly is fixedly arranged on the inner wall of the protection cover, and the water cooling assembly is arranged on the peripheral side of the flywheel in a surrounding mode; an air cooling assembly is arranged on the side of the water cooling assembly and comprises a flow guide cover fixed to the inner wall of the protective cover and an induced draft fan located in the center area of the flow guide cover, the induced draft fan is fixedly arranged on the crankshaft in a sleeving mode, and ventilation holes are formed in the end face and the circumferential side face of the protective cover. According to the protection device, a rigid frame structure of the protection cover and the water cooling assembly is adopted, double protection is formed, a more reliable physical protection barrier is provided for the flywheel, an efficient composite heat dissipation mode of combining the water cooling assembly and the air cooling assembly is adopted, and heat generated during operation of the flywheel can be rapidly taken away.

Description

Technical Field

[0001] The present invention belongs to the technical field of diesel engines, and specifically relates to a flywheel protection device for a low-speed diesel engine. Background Art

[0002] The crankcase is an important part of a diesel engine, usually located at the lower part of the diesel engine. Its main function is to accommodate and protect moving parts such as connecting rods and crankshafts, and it is also a place to store lubricating oil. The crankshaft is one of the key components of the crankshaft connecting rod mechanism. It is installed in the crankcase and connected to the crankcase through bearings, and can rotate flexibly in the crankcase. A flywheel is provided at the end of the crankshaft. As the core component of power transmission of the diesel engine, the flywheel continuously bears high speed, large torque and severe vibration during operation, not only generating a large amount of heat, but also posing a safety hazard due to the exposure of high-speed rotating components. Therefore, in order to ensure the normal operation of the flywheel and the reliability of the diesel engine, certain protective and heat dissipation measures are usually required.

[0003] The existing flywheel protection devices have insufficient protection structure strength, are prone to deformation or loosening, resulting in an increased risk of foreign object intrusion, unable to provide reliable enclosed protection for the flywheel, and unable to effectively dissipate heat from the flywheel, making it difficult to quickly remove the large amount of heat generated by the flywheel; the existing integrated flywheel protection covers are difficult to disassemble after installation. When overhauling the flywheel and its transmission components, the protection cover needs to be disassembled as a whole, which is cumbersome and time-consuming, increasing the equipment downtime and maintenance costs. Although some split protection covers can be disassembled, their structures are complex, which is not conducive to the development of daily maintenance work.

[0004] Therefore, we provide a flywheel protection device for a low-speed diesel engine to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a flywheel protection device for a low-speed diesel engine in view of the problems in the background art.

[0006] The present invention achieves the above purpose through the following technical solutions:

[0007] A flywheel protection device for a low-speed diesel engine includes a protection cover fixedly provided on the end face of the crankcase for completely enclosing the flywheel inside. A water cooling component is fixedly provided on the inner wall of the protection cover, and the water cooling component is arranged around the circumference of the flywheel; an air cooling component is provided on the side of the water cooling component. The air cooling component includes a diversion cover fixedly provided on the inner wall of the protection cover and an induction fan located in the central area of the diversion cover. The induction fan is fixedly sleeved on the crankshaft, and ventilation holes are provided on both the end face and the circumferential side face of the protection cover.

[0008] As a further optimized solution of the present invention, the water cooling assembly includes a first disk body and a second disk body symmetrically distributed on both sides of the flywheel; a plurality of heat exchange tube assemblies for communicating the two are evenly distributed along the circumference between the first disk body and the second disk body.

[0009] As a further optimized solution of the present invention, a driving mechanism for driving the coolant of the water cooling assembly to circulate by using the kinetic energy of the crankshaft is further provided inside the protective cover; the driving mechanism includes a water inlet pipe communicated with the first disk body, a water outlet pipe communicated with the second disk body, and a circulation pump; the circulation pump is fixed on the flow guiding cover, and its outlet is fixedly connected with the water inlet pipe. A first gear is fixedly sleeved on the motor rotating shaft of the circulation pump, and a second gear meshing with the first gear is fixedly sleeved on the crankshaft.

[0010] As a further optimized solution of the present invention, the flow guiding cover adopts a double conical frustum splicing type variable cross-section structure, the outer contour size of its front end matches the inner diameter of the end face of the protective cover, and the outer contour size of its rear end matches the inner diameter of the first disk body.

[0011] As a further optimized solution of the present invention, the heat exchange tube assembly includes a hard pipe body and flexible pipe bodies at both ends of the hard pipe body; a fixing plate is fixedly provided between the first disk body and the second disk body, a supporting seat is fixedly provided on the fixing plate, the hard pipe body is rotatably arranged in the supporting seat, and a reset torsion spring is provided at the rotating connection; fins are provided on the surface of the hard pipe body.

[0012] As a further optimized solution of the present invention, the heat exchange tube assembly further includes a driving unit for driving the hard pipe body to rotate reciprocally by using the kinetic energy of the crankshaft; the driving unit includes a third gear fixedly sleeved on one end of the hard pipe body and a plurality of arc-shaped racks evenly distributed along the circumference on the end face of the flywheel, and the arc-shaped racks mesh with the third gear.

[0013] As a further optimized solution of the present invention, the protective cover includes a fixed cover body and two movable cover bodies; the fixed cover body is provided with mounting holes for fixedly connecting with the crankcase, and two symmetrically distributed sliding grooves are further opened on the fixed cover body. Sliding plates are slidably arranged in both sliding grooves, and a first support is provided at the end of the sliding plate; the movable cover body is in a semi-cylindrical shape, and a second support is provided at the corresponding position on the outer surface and is rotatably connected with the first support through a pin shaft. The movable cover body is provided with a through hole for the flywheel transmission assembly to pass through, and ear plates are respectively extended at the upper and lower edges of the movable cover body, and the two movable cover bodies are horizontally fixedly connected through the ear plates.

[0014] As a further optimized solution of the present invention, the flow guiding cover is spliced by two semi-cover bodies and is respectively fixed on the corresponding movable cover bodies; the water cooling assembly is spliced by two semi-ring bodies and is respectively fixed on the corresponding movable cover bodies.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. The present invention adopts a rigid frame structure of a protective cover and a water-cooling component to form a double protection, providing a more reliable physical protection barrier for the flywheel and effectively enhancing the protection performance of the flywheel.

[0017] 2. The present invention adopts an efficient composite heat dissipation method combining a water-cooling component and an air-cooling component. By increasing the contact area between the coolant and the flywheel and using a deflector to guide the air flow to form forced convection, the maximum heat exchange efficiency is achieved. The complementary effect of water-cooling and air-cooling can quickly remove the heat generated during the operation of the flywheel, ensuring that it maintains a stable working temperature under complex working conditions.

[0018] 3. The present invention adopts a combined protective cover, which is composed of a fixed cover body and two movable cover bodies spliced together. It is not necessary to disassemble the entire protective cover to repair, maintain or replace the flywheel and its transmission components, greatly improving the maintenance efficiency and shortening the downtime. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a three-dimensional schematic diagram of the overall structure of the present invention;

[0020] Figure 2 is a schematic diagram of the structure of the water-cooling component and the driving mechanism of the present invention;

[0021] Figure 3 is a schematic diagram of the connection structure between the deflector and the water-cooling component of the present invention;

[0022] Figure 4 is a schematic diagram of the structure of the heat exchange tube assembly of the present invention;

[0023] Figure 5 is a schematic diagram of the installation structure of each component on the crankshaft of the present invention;

[0024] Figure 6 is a schematic diagram of the structure of the protective cover of the present invention Figure 1 ;

[0025] Figure 7 is a schematic diagram of the structure of the protective cover of the present invention Figure 2 .

[0026] In the figure:

[0027] 1. Crankcase; 101. Crankshaft; 102. Flywheel; 103. Arc rack; 2. Protective cover; 201. Fixed cover body; 201a. Mounting hole; 201b. Slide groove; 202. Movable cover body; 202a. Second support; 202b. Ear plate; 202c. Through hole; 203. Slide plate; 203a. First support; 3. Water cooling component; 301. First disk body; 302. Second disk body; 303. Heat exchange tube assembly; 303a. Rigid tube body; 303b. Flexible tube body; 303c. Support seat; 303d. Fixed plate; 303e. Fins; 303f. Third gear; 4. Driving mechanism; 401. Water inlet pipe; 402. Water outlet pipe; 403. Circulation pump; 404. First gear; 405. Second gear; 5. Induced draft fan; 6. Deflector hood. Detailed implementation manners

[0028] The present application will be further described in detail below with reference to the accompanying drawings. It is necessary to point out here that the following specific implementation manners are only used to further illustrate the present application and cannot be construed as limiting the protection scope of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0029] Embodiment 1

[0030] In order to solve the problems of insufficient protection structure strength and low heat dissipation efficiency of the existing flywheel protection device, and it is difficult to quickly take away a large amount of heat generated by the flywheel, please refer to Figure 1 、 Figure 3 , a flywheel protection device for a low-speed diesel engine provided by the present invention includes a protective cover 2 fixedly arranged on the end face of the crankcase 1 for completely covering the flywheel 102 inside. A water cooling component 3 is fixedly arranged on the inner wall of the protective cover 2, and the water cooling component 3 is arranged around the circumference of the flywheel 102 to provide a more effective cooling effect; an air cooling component is arranged on the side of the water cooling component 3. The air cooling component includes a deflector hood 6 fixedly arranged on the inner wall of the protective cover 2 and an induced draft fan 5 located in the central area of the deflector hood 6. The induced draft fan 5 is fixedly sleeved on the crankshaft 101 and can be assembled by a key connection method. Ventilation holes are arranged on both the end face and the circumferential side face of the protective cover 2 to facilitate air circulation.

[0031] As Figure 2As shown in the figure, the water-cooling component 3 includes a first disk body 301 and a second disk body 302 symmetrically distributed on both sides of the flywheel 102. The first disk body 301 and the second disk body 302 are fixed on the inner wall of the protective cover 2. Between the first disk body 301 and the second disk body 302, there are a plurality of heat exchange tube assemblies 303 evenly distributed along the circumference for connecting the two. Both the first disk body 301 and the second disk body 302 are made of high-strength alloy steel. The two are welded into a rigid frame structure through a fixing plate 303d. This double-disk body assembly not only serves as a key component of the water-cooling system, but also utilizes the high hardness and impact resistance characteristics of the material to form a physical protection barrier around the flywheel 102, which can effectively resist the impact of foreign objects and the intrusion of splashes, and at the same time bear the centrifugal force and vibration load generated by the operation of the flywheel 102, with both heat exchange and mechanical protection functions.

[0032] A driving mechanism 4 is also provided in the protective cover 2 for driving the coolant of the water-cooling component 3 to circulate by using the kinetic energy of the crankshaft 101. The driving mechanism 4 includes a water inlet pipe 401 communicated with the first disk body 301, a water outlet pipe 402 communicated with the second disk body 302, and a circulation pump 403. The circulation pump 403 is fixed on the guide cover 6, and its outlet is fixedly connected to the water inlet pipe 401. A first gear 404 is fixedly sleeved on the motor rotating shaft of the circulation pump 403, and a second gear 405 meshing with the first gear 404 is fixedly sleeved on the crankshaft 101.

[0033] When the crankshaft 101 rotates, it drives the second gear 405 to rotate synchronously. The second gear 405 transmits power to the motor rotating shaft of the circulation pump 403 through meshing with the first gear 404, thereby driving the circulation pump 403 to operate. After the circulation pump 403 operates, it sucks the coolant from the water inlet pipe 401, and after heat exchange through the first disk body 301, the heat exchange tube assembly 303 and the second disk body 302, it is then discharged through the water outlet pipe 402, realizing the circulating flow of the coolant, and further continuously and effectively cooling the flywheel 102.

[0034] The guide cover 6 adopts a double conical frustum splicing variable cross-section structure. The outer contour dimension of its front end matches the inner diameter of the end face of the protective cover 2, and the outer contour dimension of its rear end matches the inner diameter of the first disk body 301. During operation, the induced draft fan 5 drives the air flow to accelerate after passing through the reduced diameter of the guide cover 6, and then passes over the surface of the flywheel 102 in a laminar flow state, forming a forced convection heat transfer field in the annular gap between the flywheel 102 and the first disk body 301, realizing full coverage forced convection heat dissipation on the surface and periphery of the flywheel 102, and significantly improving the heat dissipation efficiency.

[0035] Embodiment 2

[0036] On the basis of Embodiment 1, in order to strengthen the heat exchange effect between the water-cooling component 3 and the air-cooling component, as Figures 4 - 5As shown in the figure, the heat exchange tube assembly 303 includes a rigid tube body 303a and flexible tube bodies 303b located at both ends of the rigid tube body 303a; a fixed plate 303d is fixedly arranged between the first disk body 301 and the second disk body 302, a support seat 303c is fixedly arranged on the fixed plate 303d, the rigid tube body 303a is rotatably arranged in the support seat 303c, and a return torsion spring is arranged at the rotation connection; fins 303e are arranged on the surface of the rigid tube body 303a to further enhance the heat dissipation effect of the rigid tube body 303a. The rigid tube body 303a is made of a metal material with high strength and high thermal conductivity to ensure good heat conduction performance, and the flexible tube body 303b is made of a rubber material with good flexibility and corrosion resistance to facilitate the slight rotation of the rigid tube body 303a.

[0037] The heat exchange tube assembly 303 further includes a driving unit for using the kinetic energy of the crankshaft 101 to drive the rigid tube body 303a to rotate reciprocally; the driving unit includes a third gear 303f fixedly sleeved on one end of the rigid tube body 303a and a plurality of arc-shaped racks 103 evenly distributed along the circumference on the end face of the flywheel 102, and the arc-shaped racks 103 are meshed with the third gear 303f.

[0038] When the crankshaft 101 rotates, it drives the flywheel 102 to rotate synchronously. At this time, the arc-shaped racks 103 fixed on the end face of the flywheel 102 rotate accordingly and engage with the third gear 303f for meshing transmission. During the meshing process, the third gear 303f is driven to drive the rigid tube body 303a to rotate in the support seat 303c. During the rotation of the rigid tube body 303a, the return torsion spring will generate corresponding torsion. When the arc-shaped rack 103 disengages from the third gear 303f, the return torsion spring will make the rigid tube body 303a return to its initial position; the reciprocating rotation of the rigid tube body 303a can continuously change the air flow distribution around it, making the air flow irregularly, breaking the stability of the boundary layer, enhancing air convection, and thus further improving the heat dissipation efficiency of the heat exchange tube assembly 303. The reciprocating rotation of the rigid tube body 303a can also change the air flow direction in the deflector 6, making the air flow more evenly distributed around the flywheel 102, eliminating air flow dead corners. The disturbance generated by the rotation can also prompt the air to form a more effective circulation path in the protective cover 2, enhancing the scouring effect of the air on the surface of the flywheel 102 and the water cooling assembly 3, and further improving the heat dissipation capacity of the air cooling assembly; using the kinetic energy of the crankshaft 101 to drive the rigid tube body 303a to rotate realizes the recycling of energy, does not require an additional power source, reduces the energy consumption of the system, and improves the energy utilization efficiency.

[0039] Embodiment Three

[0040] On the basis of Embodiment One and Embodiment Two, in order to facilitate the maintenance, repair or replacement of the flywheel 102 and its transmission components, such as Figures 6 - 7As shown in the figure, the protective cover 2 includes a fixed cover body 201 and two movable cover bodies 202. The three are spliced to form a complete cylindrical protective space. The fixed cover body 201 is provided with mounting holes 201a for fixedly connecting with the crankcase 1, and two symmetrically distributed sliding grooves 201b are also formed on the fixed cover body 201. Sliding plates 203 are slidably arranged in both of the two sliding grooves 201b. The sliding plates 203 form a precision sliding pair with the sliding grooves 201b through dovetail grooves. The end of the sliding plate 203 is provided with a first support 203a. The movable cover body 202 is semi-cylindrical. A second support 202a is provided at the corresponding position on the outer surface. It is rotationally connected with the first support 203a through a pin shaft. The movable cover body 202 is provided with through holes 202c for the transmission components of the flywheel 102 to pass through. The upper and lower edges of the movable cover body 202 are respectively extended with ear plates 202b. A plurality of connection holes are evenly distributed on the ear plates 202b. The two movable cover bodies 202 are horizontally fixedly connected through the ear plates 202b.

[0041] During operation, the complete protective cover 2 isolates foreign objects from the outside, preventing metal chips, dust, etc. from entering, and avoiding foreign objects from hitting the flywheel 102 or winding the transmission components. At the same time, the two semi-cover bodies of the deflector 6 are fixed on the movable cover body 202 and work together with the water cooling component 3. The first disc body 301, the second disc body 302 and the heat exchange tube assembly 303 of the water cooling component 3 form a circulation channel, which cooperates with the deflector 6 to guide the airflow generated by the induced draft fan 5 to perform forced convection heat dissipation on the flywheel 102. At this time, the protective cover 2 made of high-strength alloy steel and the rigid frame of the water cooling component 3 form a double protection, providing a more reliable physical protection barrier for the flywheel 102. When it is necessary to repair the flywheel 102 and its transmission components, the operator first loosens the connection bolts of the ear plates 202b of the movable cover body 202, pushes the movable cover body 202, so that the sliding plate 203 slides in the sliding groove 201b until the semi-annular body of the water cooling component 3 is far away from the flywheel 102, and then rotates and opens around the first support 203a, then the flywheel 102 and the internal components can be exposed, and at the same time the water cooling component 3 is exposed for quick repair, maintenance or replacement. After completion, reverse the operation to restore the closed state of the protective cover 2.

[0042] The protective cover 2 adopts a combined structure design and is spliced by a fixed cover body 201 and two movable cover bodies 202. The movable cover body 202 can be rotated and opened around the first support 203a. It is not necessary to disassemble the entire protective cover 2 to repair, maintain or replace the flywheel 102 and its transmission components, which greatly improves the maintenance efficiency and shortens the downtime. The movable cover body 202 slides in the sliding groove 201b through the sliding plate 203 and cooperates with the bolt connection of the ear plate 202b to achieve quick disassembly and assembly. Compared with the traditional integral type, the operation difficulty and labor cost are significantly reduced.

[0043] The fairing 6 is formed by splicing two half fairings, which are respectively fixed on the corresponding movable fairings 202. A sealing strip is provided at the edge of the half fairing to ensure the sealing performance after the two half fairings are spliced and prevent liquid leakage; the water cooling component 3 is formed by splicing two half rings, which are respectively fixed on the corresponding movable fairings 202.

[0044] The above embodiments only represent one implementation mode of the present invention, and the description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A flywheel protection device for a low-speed diesel engine, comprising a protective cover (2) fixedly arranged on the end face of a crankcase (1) and used for completely covering a flywheel (102) inside, characterized in that: A water-cooling component (3) is fixedly arranged on the inner wall of the protective cover (2), and the water-cooling component (3) is arranged around the circumference of the flywheel (102); An air-cooling component is arranged on the side of the water-cooling component (3). The air-cooling component includes a diversion cover (6) fixed on the inner wall of the protective cover (2) and an induced draft fan (5) located in the central area of the diversion cover (6). The induced draft fan (5) is fixedly sleeved on the crankshaft (101). Ventilation holes are provided on both the end face and the circumferential side face of the protective cover (2).

2. The flywheel protection device for a low-speed diesel engine according to claim 1, characterized in that: The water-cooling component (3) includes a first disk body (301) and a second disk body (302) symmetrically distributed on both sides of the flywheel (102); A plurality of heat exchange tube assemblies (303) for communicating the two are evenly distributed along the circumference between the first disk body (301) and the second disk body (302).

3. The flywheel protection device for a low-speed diesel engine according to claim 2, characterized in that: A driving mechanism (4) for using the kinetic energy of the crankshaft (101) to drive the coolant of the water-cooling component (3) to circulate is further arranged in the protective cover (2); The driving mechanism (4) includes a water inlet pipe (401) communicated with the first disk body (301), a water outlet pipe (402) communicated with the second disk body (302), and a circulating pump (403); The circulating pump (403) is fixed on the diversion cover (6), and its outlet is fixedly connected with the water inlet pipe (401). A first gear (404) is fixedly sleeved on the motor rotating shaft of the circulating pump (403), and a second gear (405) meshing with the first gear (404) is fixedly sleeved on the crankshaft (101).

4. A flywheel protection device for a low-speed diesel engine according to claim 2, characterized in that: The diversion cover (6) adopts a double conical frustum splicing variable cross-section structure. The outer contour dimension of its front end matches the inner diameter of the end face of the protective cover (2), and the outer contour dimension of its rear end matches the inner diameter of the first disk body (301).

5. The flywheel protection device for a low-speed diesel engine according to claim 2, characterized in that: The heat exchange tube assembly (303) includes a hard tube body (303a) and flexible tube bodies (303b) located at both ends of the hard tube body (303a); A fixing plate (303d) is fixedly arranged between the first disk body (301) and the second disk body (302). A support seat (303c) is fixedly arranged on the fixing plate (303d). The hard tube body (303a) is rotatably arranged in the support seat (303c), and a return torsion spring is arranged at the rotation connection. Fins (303e) are arranged on the surface of the hard tube body (303a).

6. The flywheel protection device for a low-speed diesel engine according to claim 5, characterized in that: The heat exchange tube assembly (303) further includes a driving unit for using the kinetic energy of the crankshaft (101) to drive the hard tube body (303a) to rotate reciprocally; The driving unit includes a third gear (303f) fixedly sleeved on one end of the hard tube body (303a) and a plurality of arc-shaped racks (103) evenly distributed along the circumference on the end face of the flywheel (102). The arc-shaped racks (103) are meshed with the third gear (303f).

7. A flywheel protection device for a low-speed diesel engine according to claim 1, characterized in that: The protective cover (2) includes a fixed cover body (201) and two movable cover bodies (202); The fixed cover (201) is provided with mounting holes (201a) for fixedly connecting with the crankcase (1), and two symmetrically distributed sliding grooves (201b) are also formed in the fixed cover (201). Sliding plates (203) are slidably arranged in the two sliding grooves (201b), and a first support (203a) is arranged at the end of the sliding plate (203). The movable cover (202) is semi-cylindrical, and a second support (202a) is arranged at the corresponding position on the outer surface. It is rotatably connected with the first support (203a) through a pin shaft. The movable cover (202) is provided with a through hole (202c) for the transmission assembly of the flywheel (102) to pass through. Ear plates (202b) are respectively extended at the upper and lower edges of the movable cover (202). The two movable covers (202) are horizontally fixedly connected through the ear plates (202b).

8. A flywheel protection device for a low-speed diesel engine according to claim 7, characterized in that: The flow guide cover (6) is formed by splicing two semi-covers, and is respectively fixed on the corresponding movable cover (202). The water cooling assembly (3) is formed by splicing two semi-rings, and is respectively fixed on the corresponding movable cover (202).

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