Marine diesel engine piston ring wear monitoring device

Abstract

The invention discloses a marine diesel engine piston ring wear monitoring device in the technical field of diesel engines, comprising: a cylinder liner and a piston arranged inside the cylinder liner, wherein the outer wall of the piston is sleeved with a piston ring that fits with the inner wall of the cylinder liner, the inner wall of the cylinder liner is provided with a placement groove that is located above the piston, a movable plate is slidably installed in the inner cavity of the placement groove, an elastic member is installed between the inner side wall of the movable plate and the inner cavity of the placement groove, a support block is installed in the inner cavity of the placement groove, and a first touch switch is installed on a side wall of the support block close to the movable plate, the air pressure inside the cylinder liner will change due to the movement of the piston in the device, and the indicator light of the detection mechanism will light up due to the change of the air pressure, and whether the air pressure inside the cylinder liner changes when the piston is working can be determined by observing whether the indicator light is lit, thereby judging whether the piston ring is worn, so that people can timely understand the wear condition of the piston ring and ensure the normal working efficiency of the diesel engine.

Description

Technical Field

[0001] The invention relates to the technical field of diesel engines, in particular to a wear monitoring device for piston rings of marine diesel engines. Background Art

[0002] A marine diesel engine is a power device that provides power for the ship's travel or for the operation of a ship's generator.

[0003] The piston is an important part of the diesel engine. During the operation of the diesel engine, the piston will slide in the inner cavity of the cylinder liner. Long-term operation will cause wear to the piston ring on the outside of the piston.

[0004] However, the piston ring is located inside the diesel engine, which makes it difficult to detect the wear of the piston ring in time, which will affect the normal operation of the diesel engine. For this reason, we propose a marine diesel engine piston ring wear monitoring device. Summary of the invention

[0005] The purpose of the present invention is to provide a marine diesel engine piston ring wear monitoring device to solve the problem in the above background technology that the piston ring is located inside the diesel engine, resulting in the piston ring being difficult to detect in time when it is worn.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a marine diesel engine piston ring wear monitoring device, comprising: a cylinder liner and a piston arranged inside the cylinder liner, wherein the outer wall of the piston is sleeved with a piston ring that fits with the inner wall of the cylinder liner, the inner wall of the cylinder liner is provided with a placement groove located above the piston, a movable plate is slidably installed in the inner cavity of the placement groove, and an elastic member is installed between the inner side wall of the movable plate and the inner cavity of the placement groove,

[0007] A support block is installed in the inner cavity of the placement groove, a first touch switch is installed on a side wall of the support block close to the movable plate, a pressure plate on the inner wall of the movable plate is installed on the same axis as the first touch switch, and the first touch switch is electrically connected to the external warning light.

[0008] Preferably, the pressure plate includes a mounting block installed on the inner wall of the movable plate, a side wall of the mounting block close to the first touch switch is provided with a movable groove extending toward one side of the movable plate, a movable block is slidably inserted into the inner cavity of the movable groove, an elastic element is installed between the outer wall of the movable block and the inner wall of the movable groove, and a pressure block is installed at the outer end of the movable block.

[0009] Preferably, the inner cavity of the placement groove is provided with a limiting support rod which is coaxial with the pressing block.

[0010] Wherein, the length of the vertical section of the limiting support rod is greater than the thickness of the vertical section of the support block, and the length of the vertical section of the limiting support rod is less than the sum of the thicknesses of the support block and the first touch switch.

[0011] Preferably, a receiving groove is provided at the bottom of the inner cavity of the placement groove, and an electromagnet for fixing the moving plate is installed in the inner cavity of the receiving groove.

[0012] Wherein, the moving plate is a magnetic metal moving plate.

[0013] Preferably, the inner wall of the cylinder sleeve is provided with a mounting groove above the piston, a movable pressure block is slidably mounted in the inner cavity of the mounting groove, a spring member is mounted between the inner side wall of the movable pressure block and the inner wall of the mounting groove, and a second touch switch is mounted in the inner cavity of the mounting groove and is located inside the movable pressure block.

[0014] Wherein, the second touch switch is electrically connected to the electromagnet.

[0015] Preferably, the movable pressure block includes a connecting block slidably inserted into the inner cavity of the installation groove, the spring member is connected to the inner wall of the connecting block, a guide block is installed on the inner wall of the connecting block, a movable block is slidably sleeved on the outer wall of the guide block, and a connecting spring is installed between the movable block and the guide block.

[0016] Preferably, a groove is provided on the top wall of the movable block, a limit block is slidably installed in the inner cavity of the groove, a spring is installed between the limit block and the groove, the upper surface of the limit block is an inclined surface facing the second touch switch, and a protrusion is installed on the inner side of the limit block at the top of the inner cavity of the installation groove, and the protrusion and the limit block are on the same axis.

[0017] Preferably, a driving motor is mounted on the outer wall of the cylinder sleeve, and a pull rope is provided on the output shaft of the driving motor. The end of the pull rope extends into the inner cavity of the placement groove and is connected to the inner wall of the movable plate.

[0018] Compared with the prior art, the beneficial effect of the present invention is that the movement of the piston in the device causes the air pressure inside the cylinder liner to change, and the change in air pressure causes the indicator light of the detection mechanism to illuminate. By observing whether the indicator light illuminates, it is determined whether the air pressure inside the cylinder liner changes when the piston is working, thereby judging whether the piston ring is worn, so that people can timely understand the wear condition of the piston ring and ensure the normal working efficiency of the diesel engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention;

[0020] Figure 2 This is an enlarged schematic diagram of the structure at A of the present invention;

[0021] Figure 3 This is an enlarged schematic diagram of the structure at B of the present invention;

[0022] Figure 4 This is a schematic diagram of the connection structure between the movable plate and the pressing plate of the present invention;

[0023] Figure 5 It is a schematic diagram of the structure of the movable pressing block of the present invention.

[0024] In the figure: 1. cylinder sleeve; 2. piston; 3. piston ring; 4. mounting groove; 5. movable plate; 6. support block; 7. first touch switch; 8. pressure plate; 81. mounting block; 82. movable block; 83. pressure block; 9. electromagnet; 10. driving motor; 11. pull rope; 12. limit support rod; 13. mounting groove; 14. second touch switch; 15. movable pressure block; 151. movable block; 152. guide block; 153. connecting block; 154. slot; 155. limit block; 16. protrusion. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Embodiment 1:

[0027] See also Figure 1 The marine diesel engine piston ring wear monitoring device comprises: a cylinder liner 1, a piston 2 and a piston ring 3, wherein the piston 2 is installed in the inner cavity of the cylinder liner 1, the piston ring 3 is sleeved on the outer wall of the piston 2 and fits with the inner wall of the cylinder liner 1, and the connection method of the cylinder liner 1, the piston 2 and the piston ring 3 belongs to the prior art and is not described in detail here;

[0028] See also Figure 1 and Figure 2 In order to detect the wear of the piston ring 3 in time, a placement groove 4 is provided on the inner wall of the cylinder liner 1. The placement groove 4 is located above the cylinder liner 1, and when the piston 2 moves in the inner cavity of the cylinder liner 1, the piston 2 always moves below the placement groove 4, so that the piston 2 will not affect the detection mechanism when working. A moving plate 5 is slidably installed in the inner cavity of the placement groove 4, and the moving plate 5 can move left and right ( Figure 1 , Figure 2 In the direction shown), an elastic member (spring) is installed between the right side wall of the movable plate 5 and the inner cavity of the placement groove 4, and a support block 6 ( Figure 2 The first touch switch 7 is installed on the left side wall of the support block 6, and the right side wall of the movable plate 5 is installed with a pressing plate 8, which is aligned with the first touch switch 7, and the first touch switch 7 is electrically connected to an external warning light, which refers to an LED light, installed in an area that is convenient for observation from the outside, and is determined according to specific circumstances;

[0029] See also Figure 2 and Figure 4 In order to protect the first touch switch 7, the pressure plate 8 is composed of a mounting block 81, a moving block 82, a pressure block 83 and an elastic element. The mounting block 81 is installed on the right side wall of the moving plate 5 ( Figure 4 The moving block 82 is slidably inserted into the inner cavity of the moving groove, and the moving block 82 can move left and right. An elastic element (spring) is installed between the outer wall of the moving block 82 and the inner wall of the moving groove. A pressing block 83 is installed on the right side wall of the moving block 82. When the moving plate 5 moves and the pressing plate 8 presses the first touch switch 7, the pressing block 83 contacts the first touch switch 7, which will cause the moving block 82 to move into the inner cavity of the moving groove, causing the elastic element to contract, thereby achieving a buffering effect and reducing the impact of the pressing plate 8 on the first touch switch 7. The pressure caused by the limit support rod 12 is installed on the right side of the inner cavity of the placement groove 4. The limit support rod 12 is arranged horizontally and aligned with the pressure plate 8. The length of the vertical section of the limit support rod 12 is greater than the thickness of the vertical section of the support block 6. The length of the vertical section of the limit support rod 12 is less than the sum of the thickness of the support block 6 and the first touch switch 7. The limit support rod 12 is used to limit the rightward movement of the pressure plate 8, so that the pressure plate 8 cannot continue to move right after contacting the first touch switch 7, and the limit support rod 12 is supported to reduce the pressure caused by the pressure plate 8 on the first touch switch 7;

[0030] See also Figure 2 and Figure 3 A receiving and releasing groove is provided at the bottom of the inner cavity of the placement groove 4, and an electromagnet 9 is installed in the inner cavity of the receiving and releasing groove. The movable plate 5 is a magnetic metal movable plate 5. The movable plate 5 is made of metal and can be adsorbed by the electromagnet 9 (such as iron). The movable plate 5 is fixed. A mounting groove 13 is provided on the inner wall of the cylinder sleeve 1. The mounting groove 13 is also located above the piston 2, and the piston 2 can only be located below the mounting groove 13 during operation, so that the piston 2 will not affect the detection mechanism when working. A movable pressure block 15 is slidably installed in the inner cavity of the mounting groove 13, and the movable pressure block 15 can move left and right ( Figure 3 A spring member (spring) is installed between the inner wall of the movable pressing block 15 and the inner wall of the mounting groove 13, and a second touch switch 14 is installed in the inner cavity of the mounting groove 13. The second touch switch 14 is located on the right side of the movable pressing block 15, and the second touch switch 14 is electrically connected to the electromagnet 9 for controlling the operation of the electromagnet 9;

[0031] See also Figure 3 and Figure 5The movable pressing block 15 includes a connecting block 153 which is slidably inserted into the inner cavity of the installation groove 13. The left end of the spring member is connected to the right side wall of the connecting block 153. A guide block 152 is installed on the inner wall of the connecting block 153. A movable block 151 is slidably sleeved on the outer wall of the guide block 152. The movable block 151 can move left and right on the outer wall of the guide block 152, and a connecting spring is installed between the movable block 151 and the guide block 152. When the piston 2 moves downward and the air pressure above the inner cavity of the cylinder sleeve 1 is reduced, the pressure on the movable pressing block 15 is reduced, which will cause the connecting block 153 of the movable pressing block 15 to move to the left and reset first. At this time, the movable block 151 does not move and contacts the second touch switch 14, so that the electromagnet 9 fixes the movable plate 5 The piston 2 is fixed, so that the pressure plate 8 presses the first touch switch 7, so that the external indicator light remains in the working state and will not be extinguished immediately (because the piston 2 reciprocates up and down, if the piston 2 moves down, the movable plate 5 moves directly, the indicator light will be extinguished, and then the piston 2 moves up, which will make the indicator light light up again, resulting in the indicator light being frequently turned on and off, which will affect the detection result). When the air pressure above the inner cavity of the cylinder sleeve 1 does not increase, the connecting block 153 moves to the left to a certain distance under the action of the spring member, and the connecting block 153 continues to move to the left and moves with the movable block 151, so that the movable block 151 is reset and does not contact the second touch switch 14, so that the electromagnet 9 is powered off, the movable plate 5 moves, and the indicator light is extinguished;

[0032] See also Figure 5 In order to further ensure that the indicator light will not go out immediately, a slot 154 is provided on the top wall of the movable block 151, and a limit block 155 is slidably installed in the inner cavity of the slot 154. The limit block 155 can move up and down, and a spring is installed between the limit block 155 and the slot 154. The upper surface of the limit block 155 is an inclined surface facing the second touch switch 14. A rubber bump 16 is installed on the top of the inner cavity of the installation groove 13. The bump 16 and the limit block 155 are on the same axis and on the right side of the limit block 155. When the movable block 151 of the moving pressure block 15 presses the second touch switch 14, the limit block 155 will move to the right side of the bump 16, and the movable block 151 will be restricted by the bump 16, so that the movable block 151 will not be reset immediately.

[0033] Embodiment 2:

[0034] See also Figure 2 On the basis of Example 1, in order to understand whether the detection mechanism can work normally, a drive motor 10 is installed on the outer wall of the cylinder sleeve 1, and a pull rope 11 is wound around the outer edge of the output shaft of the drive motor 10. The end of the pull rope 11 extends into the inner cavity of the placement groove 4 and is connected to the inner wall of the movable plate 5. Before the piston 2 works, the drive motor 10 works to wind the pull rope 11 around the output shaft of the drive motor 10, so that the movable plate 5 and the pressure plate 8 press the first touch switch 7 to make the indicator light up. By observing whether the indicator light is on, it is determined whether the detection mechanism works normally.

[0035] Working principle: When the diesel engine is working, the piston 2 moves in the inner cavity of the cylinder liner 1. If the piston ring 3 fits tightly with the inner wall of the cylinder liner 1 (the piston ring 3 is not worn), the piston 2 moves up, and the air pressure above the inner cavity of the cylinder liner 1 increases, which will cause the movable plate 5 to move into the inner cavity of the placement groove 4, and the pressure plate 8 will move with the movable plate 5, and the first touch switch 7 will be pressed to make the external indicator light up. At this time, the movable pressure block 15 will also move into the inner cavity of the installation groove 13 due to the increase of the air pressure above the inner cavity of the cylinder liner 1. The second touch switch 14 is pressed to energize the electromagnet 9 to generate magnetic force, adsorb the movable plate 5, and fix the movable plate 5. The piston 2 reciprocates up and down in the inner cavity of the cylinder liner 1, and the indicator light continues to light up. If a gap is generated between the piston ring 3 and the inner wall of the cylinder liner 1 due to wear, the piston 2 moves up and down, and the air pressure above the inner cavity of the cylinder liner 1 does not change much, which will make the indicator light not work. Whether the piston ring 3 is worn is detected by whether the indicator light is turned on.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Marine diesel engine piston ring wear monitoring device, including: A cylinder sleeve (1) and a piston (2) arranged inside the cylinder sleeve (1), wherein the outer wall of the piston (2) is sleeved with a piston ring (3) which is in contact with the inner wall of the cylinder sleeve (1), and is characterized in that: the inner wall of the cylinder sleeve (1) is provided with a placement groove (4) located above the piston (2), a movable plate (5) is slidably installed in the inner cavity of the placement groove (4), and an elastic member is installed between the inner side wall of the movable plate (5) and the inner cavity of the placement groove (4), The inner cavity of the placement groove (4) is provided with a support block (6), a side wall of the support block (6) close to the movable plate (5) is provided with a first touch switch (7), an inner side wall of the movable plate (5) is provided with a pressure plate (8) coaxial with the first touch switch (7), and the first touch switch (7) is electrically connected to an external warning light; The pressing plate (8) comprises a mounting block (81) mounted on the inner wall of the movable plate (5); a movable groove extending toward one side of the movable plate (5) is provided on a side wall of the mounting block (81) close to the first touch switch (7); a movable block (82) is slidably inserted into the inner cavity of the movable groove; an elastic element is installed between the outer wall of the movable block (82) and the inner wall of the movable groove; and a pressing block (83) is installed on the outer end of the movable block (82); The bottom of the inner cavity of the placement groove (4) is provided with a receiving groove, and the inner cavity of the receiving groove is provided with an electromagnet (9) for fixing the moving plate (5), and the moving plate (5) is a magnetic metal moving plate (5); The inner wall of the cylinder sleeve (1) is provided with a mounting groove (13) located above the piston (2); a movable pressure block (15) is slidably mounted in the inner cavity of the mounting groove (13); a spring member is mounted between the inner side wall of the movable pressure block (15) and the inner wall of the mounting groove (13); a second touch switch (14) is mounted in the inner cavity of the mounting groove (13) and is located inside the movable pressure block (15); and the second touch switch (14) is electrically connected to the electromagnet (9).

2. The marine diesel engine piston ring wear monitoring device according to claim 1 is characterized in that: The inner cavity of the placement groove (4) is provided with a limiting support rod (12) which is coaxial with the pressing block (83). The length of the vertical section of the limiting support rod (12) is greater than the thickness of the vertical section of the support block (6), and the length of the vertical section of the limiting support rod (12) is less than the sum of the thicknesses of the support block (6) and the first touch switch (7).

3. The marine diesel engine piston ring wear monitoring device according to claim 1, characterized in that: The movable pressure block (15) comprises a connecting block (153) slidably inserted into the inner cavity of the installation groove (13); the spring member is connected to the inner wall of the connecting block (153); a guide block (152) is installed on the inner wall of the connecting block (153); a movable block (151) is slidably sleeved on the outer wall of the guide block (152); and a connecting spring is installed between the movable block (151) and the guide block (152).

4. The marine diesel engine piston ring wear monitoring device according to claim 3 is characterized in that: The top wall of the movable block (151) is provided with a slot (154), a limit block (155) is slidably installed in the inner cavity of the slot (154), a spring is installed between the limit block (155) and the slot (154), the upper surface of the limit block (155) is an inclined surface facing the second touch switch (14), and a protrusion (16) located inside the limit block (155) is installed at the top of the inner cavity of the installation groove (13), and the protrusion (16) and the limit block (155) are on the same axis.

5. The marine diesel engine piston ring wear monitoring device according to claim 1, characterized in that: A driving motor (10) is mounted on the outer wall of the cylinder sleeve (1), and a pull rope (11) is arranged on the output shaft of the driving motor (10). The end of the pull rope (11) extends into the inner cavity of the placement groove (4) and is connected to the inner wall of the moving plate (5).

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