Marine six-cylinder diesel engine starting compressed air distributor and assembly method

Abstract

The present invention discloses a compressed air distributor for starting a marine six-cylinder diesel engine. An oil seal in a central through hole of a distributor body separates a bushing from a compressed air chamber. A transmission gear and a distributor disk are respectively fixed on both ends of a speed regulating rod. A compressed air input hole is vertically connected to a central countersunk hole on the inner side of a rear end cover. One end of six vertical air delivery holes on the upper middle side of the distributor body is respectively connected to a corresponding cylinder body, and the other end is respectively connected to six horizontal air delivery holes. The assembly method of the present invention is as follows: 1) the bushing and the oil seal are respectively installed in the distributor body, 2) the distributor disk is fixed on one end of the speed regulating rod and then installed in the distributor body, and 3) a control pin locks the initial relative positions of the six horizontal air delivery holes and the arc-shaped air intake groove and the horseshoe-shaped air discharge groove of the distributor disk. The present invention improves the starting efficiency and starting reliability of a marine six-cylinder diesel engine and ensures the starting safety of the marine six-cylinder diesel engine.

Description

Technical Field

[0001] The invention relates to a diesel engine starting device, in particular to a device for starting a diesel engine by compressed air and an assembly method, belonging to the technical field of internal combustion engines. Background Art

[0002] The starting resistance of small and medium power diesel engines (single cylinder power ≤ 18kW) is small, and the diesel engine can be started relatively smoothly using a pneumatic motor or an electric motor. The starting resistance of high-power marine diesel engines is large, and compressed air is generally used for direct starting. According to the ignition sequence of the diesel engine cylinders, the pre-filled high-pressure air bottle or the compressed air station on the ship outputs compressed air with an air pressure of 3Mpa, which is sequentially input into the corresponding cylinders to push the piston downward to drive the crankshaft to rotate, thereby starting the diesel engine. In the existing starting compressed air distribution device, the air supply hole on the distributor disk is equivalent to or slightly larger than the diameter of the air intake duct. Since the current speed of medium-speed marine diesel engines is 700 rpm to 900 rpm, the time left for compressed air to enter the cylinder is very short, and the high-pressure compressed air cannot be input into the corresponding cylinder in time, causing difficulty in starting the diesel engine. Summary of the invention

[0003] The purpose of the present invention is to provide a starting compressed air distributor for a marine six-cylinder diesel engine which has a compact structure, is easy to install and can reduce the interference of compressed air during starting, and an assembly method thereof.

[0004] The present invention is achieved through the following technical solutions:

[0005] A marine six-cylinder diesel engine starting compressed air distributor comprises a transmission gear, a speed regulating rod, a distributor body, a distributor plate, a bushing, an oil seal and a rear end cover, wherein the transmission gear is fixedly connected to one end of the speed regulating rod and is axially limited by a nut screwed on one end of the speed regulating rod, and the transmission gear is meshed with a camshaft driving gear; the bushing is embedded in one end of a central through hole of the distributor body, and the other end of the central through hole of the distributor body is communicated with a rear countersunk hole of the distributor body; a shoulder at one end of the bushing is adjacent to one side of the transmission gear, and the other end of the bushing abuts against an oil seal embedded in the other end of the central through hole of the distributor body, thereby A bushing is separated from the front of the distributor body and the stepped compressed air chamber at the rear of the distributor body. The other end of the speed regulating rod is fixedly connected to the distributor disk and axially limited by a nut. The distributor disk is located in the rear countersunk hole, and the rear end cover is fixed to the flange at the other end of the distributor body. The compressed air input hole entering from one side of the rear end cover is vertically connected to the central countersunk hole on the inner side of the rear end cover. The six vertical air supply holes on the upper side of the middle part of the distributor body are respectively communicated with the corresponding cylinder bodies through their respective connecting pipelines, and the vertical air supply holes are respectively connected to a circle of six horizontal air supply holes evenly distributed in the center of one side of the rear countersunk hole annular surface.

[0006] The purpose of the present invention can be further achieved by the following technical measures.

[0007] Furthermore, the six vertical air holes on the upper middle side of the distributor body are divided into two rows, front and rear, in the direction toward the transmission gear. The four vertical air holes in the front row are marked "4", "5", "3" and "2" from left to right, respectively, and are connected to the corresponding 4#, 5#, 3# and 2# cylinders through air pipes; the two vertical air holes in the rear row are marked "1" and "6" from left to right, respectively, and are connected to the corresponding 1# and 6# cylinders through air pipes.

[0008] Furthermore, the distributor disk divides the compressed air chamber into a compressed air discharge chamber at the front end and a rear countersunk hole at the rear end for conveying compressed air. Three compressed air discharge holes arranged side by side extend vertically upward from the lower side of the middle part of the distributor body. One of the compressed air discharge holes is connected to the lower part of the compressed air discharge chamber, and the other two are connected to the two sides of the compressed air discharge chamber through symmetrically inclined holes. The centers of the circle of 6 horizontal air delivery holes are evenly distributed on the horizontal air delivery hole axis distribution circle of the rear countersunk hole annulus.

[0009] Furthermore, the cross center line of the horizontal gas hole axis distribution circle divides the rear countersunk hole annulus into four quadrants of the rectangular coordinate system I to IV, and the six horizontal gas holes arranged counterclockwise are located in the four quadrants I to IV, and the counterclockwise arrangement order of the six horizontal gas holes is 1', 4', 2', 6', 3' and 5'; one end of the six horizontal gas holes is respectively vertically connected to the lower ends of the corresponding vertical gas holes of "1", "4", "2", "6", "3" and "5" in pairs; the distribution of the six horizontal gas holes in the four quadrants is as follows: 3' in quadrant I, 5' and 1' in quadrant II, 4' in quadrant III, and 2' and 6' in quadrant IV; wherein the angle between the center line of the 5' horizontal gas hole and the vertical line of the cross center line of the horizontal gas hole axis distribution circle is α=25°.

[0010] Furthermore, one side of the distributor disk is adjacent to the compressed air discharge chamber, and an arc-shaped air inlet groove is provided on the upper part of one side of the distributor disk, and two air inlet holes that cross the distributor disk are provided in the arc-shaped air inlet groove; a horseshoe-shaped air discharge groove that exceeds a semicircle is provided on the lower part of one side of the distributor disk, and the central arc line of the arc-shaped air inlet groove and the central arc line of the horseshoe-shaped air discharge groove are concentric circles, and the concentric circles coincide with a circle of six horizontal air delivery hole axis distribution circles; the two ends of the horseshoe-shaped air discharge groove are respectively bent inward to form transverse grooves, and the ends of the transverse grooves are connected to the compressed air discharge chamber. The ratio of the center angle β of the two ends of the arc-shaped air inlet groove to the circumference of 360° is 0.17, and the ratio of the center angle γ of the two ends of the horseshoe-shaped air discharge groove to the circumference of 360° is 0.69. The depth h1 of the arc-shaped air inlet groove is equal to the depth h2 of the horseshoe-shaped air discharge groove, and the width b1 of the arc-shaped air inlet groove is equal to the width b2 of the horseshoe-shaped air discharge groove, and they are respectively matched with the diameters of the horizontal air delivery holes.

[0011] Furthermore, the positioning inclined hole is located on the upper rear side of the distributor body and the outer peripheral surface of the distributor disk. The axis of the positioning inclined hole is located in the second quadrant of the rectangular coordinate system formed by the cross center line of the horizontal gas transmission hole axis distribution circle, and the angle between the positioning inclined hole and the vertical line of the cross center line of the axis distribution circle is δ=25°.

[0012] Furthermore, several inner lubricating oil storage ring grooves are arranged between the middle of the outer circumference of the speed regulating rod and the inner circumference of the adjacent bushing, and several outer lubricating oil storage ring grooves are arranged between the outer circumference of the bushing and one end of the central through hole of the distributor body, and the inner lubricating oil storage ring grooves and the outer lubricating oil storage ring grooves are respectively connected by several transverse holes penetrating the bushing; the transverse lubricating oil inlet hole enters the distributor body and communicates with the central through hole of the distributor body, one end of the right-angled lubricating oil drain hole is connected to the outer lubricating oil storage ring groove, and the other end of the lubricating oil drain hole leads to the front end surface of the distributor body.

[0013] A method for assembling a starting compressed air distributor for a marine six-cylinder diesel engine comprises the following steps:

[0014] 1) Install the bushing and oil seal into the two ends of the central through hole of the distributor body respectively. First, press the bushing into one end of the central through hole of the distributor body so that the shoulder of one end of the bushing rests on one end of the distributor body, and then embed the oil seal into the other end of the central through hole of the distributor body;

[0015] 2) The speed regulating rod is installed into the central through hole of the distributor body, and the distributor disc is fixed on the other end of the speed regulating rod by means of a conical surface fit and fixed connection. The nut on the end screw at the other end of the speed regulating rod is tightened to limit the axial position of the distributor disc. Then, one end of the speed regulating rod is passed through the inner hole of the bushing and then extends out of one end of the distributor body, so that one side of the distributor disc abuts against the rear countersunk annular surface, thereby dividing the compressed air chamber into a front compressed air discharge chamber and a rear countersunk hole at the rear end for conveying compressed air.

[0016] 3) Install the transmission gear, fix the transmission gear on one end of the speed regulating rod by means of cone-fitting fixed connection, and limit the axial position of the transmission gear by screwing a nut on the end screw at one end of the speed regulating rod;

[0017] 4) The distributor plate is accurately positioned on the rear countersunk annular surface, the control pin is inserted into the positioning inclined hole on the upper side of the distributor, and the speed regulating lever is turned counterclockwise until the lower end of the control pin is inserted into the lower positioning inclined hole on the outer peripheral surface of the distributor plate, so that the initial relative positions of the 6 horizontal air delivery holes on the rear countersunk annular surface and the arc-shaped air inlet groove and horseshoe-shaped air discharge groove of the distributor plate are positioned; at this time, the arc-shaped air inlet groove is located in the second quadrant of the rectangular coordinate system formed by the cross center line of the horizontal air delivery hole axis distribution circle, the 5' horizontal air delivery hole and part of the 1' horizontal air delivery hole are located in the arc-shaped air inlet groove, and the remaining horizontal air delivery holes are all located in the horseshoe-shaped air discharge groove;

[0018] 5) Install the rear end cover. After fixing the rear end cover on the other end of the distributor body, you can pull out the control pin and close the end of the positioning inclined hole with a screw plug to complete the assembly of the marine six-cylinder diesel engine starting compressed air distributor.

[0019] The present invention provides an arc-shaped air intake groove with two air intake holes on the upper part of one side of the distributor disk, and a horseshoe-shaped air discharge groove with a size exceeding half a circle is provided on the lower part of one side of the distributor disk. The arc-shaped air intake groove can simultaneously supply air to two cylinders in the same phase; the horseshoe-shaped air discharge groove can simultaneously discharge air from the remaining four cylinders, thereby driving the crankshaft to rotate and start the marine six-cylinder diesel engine. The arc-shaped air intake groove prolongs the time for compressed air to enter the cylinder, so that the compressed air is timely input into the corresponding cylinder. The assembly method of the present invention accurately positions the distributor disk on the rear counterbore annular surface through a control pin, ensuring that the two cylinders at the starting position can input compressed air in time. As the distributor disk rotates counterclockwise, the sequential air intake of the 1#, 4#, 2#, 3# and 5# cylinders in the ignition sequence is completed, thereby successfully completing the starting of the marine six-cylinder diesel engine. The present invention improves the starting efficiency and starting reliability of the marine six-cylinder diesel engine, and ensures the starting safety of the marine six-cylinder diesel engine.

[0020] Advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments thereof, which are given by way of example only with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the starting compressed air distributor of the present invention;

[0022] Figure 2 yes Figure 1 F-direction view;

[0023] Figure 3 yes Figure 2 AA section view;

[0024] Figure 4 yes Figure 2 BB cross-sectional view;

[0025] Figure 5 yes Figure 1 CC section view;

[0026] Figure 6 yes Figure 1 DD cross-sectional view;

[0027] Figure 7 yes Figure 1 EE cross-sectional view;

[0028] Figure 8 is a front view of the distributor plate;

[0029] Fig. 9 yes Figure 1 Right view of . DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0031] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", "front" and "back" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or part referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0032] like Figures 1 to 9 As shown, this embodiment includes a transmission gear 1, a speed regulating rod 2, a distributor body 3, a distributor disc 4, a bushing 5, an oil seal 6 and a rear end cover 7. The transmission gear 1 is fixedly connected to the left end of the speed regulating rod 2 and is axially limited by a nut 11 screwed on the left end of the speed regulating rod 2. The transmission gear 1 is meshed with a camshaft driving gear 101. The bushing 5 is embedded in the left end of the central through hole 31 of the distributor body, and the right end of the central through hole 31 of the distributor body is communicated with the compressed air chamber 32 of the distributor body 3. The shoulder 51 at the left end of the bushing 5 is adjacent to the right side of the transmission gear 1, and the right end of the bushing 5 is against the oil seal 6 embedded in the right end of the central through hole 31 of the distributor body, so that the bushing 5 lubricated by lubricating oil at the front of the distributor body 3 and the stepped compressed air chamber 32 at the rear of the distributor body 3 are separated by the oil seal 6. The right end of the speed regulating rod 2 is fixedly connected to the distributor disc 4 and is axially limited by a nut 11. The distributor disc 4 is located in the compressed air chamber 32.

[0033] like Fig. 9 As shown, the rear cover 7 is fixed to the flange 33 at the right end of the distributor body 3. The compressed air input hole 71 entering from one side of the rear cover 7 is vertically connected to the central countersunk hole 72 inside the rear cover. The six vertical air delivery holes 34 on the upper side of the middle part of the distributor body 3 are respectively connected to the corresponding cylinder bodies through their own connecting pipelines, and the vertical air delivery holes 34 are respectively connected to a circle of six horizontal air delivery holes 327 evenly distributed in the center of the rear countersunk annular surface 321.

[0034] like Figure 2 to Figure 4As shown, the six vertical gas delivery holes 34 on the upper middle side of the distributor body 3 are divided into two rows in the direction toward the transmission gear 1. The four vertical gas delivery holes 34 in the front row are marked "4", "5", "3" and "2" from left to right, respectively, and are connected to the corresponding 4#, 5#, 3# and 2# cylinders through gas delivery pipes; the two vertical gas delivery holes 34 in the rear row are marked "1" and "6" from left to right, respectively, and are connected to the corresponding 1# and 6# cylinders through gas delivery pipes. One end of the six horizontal gas delivery holes 327 of 1', 4', 2', 6', 3' and 5' is respectively vertically connected to the lower ends of the corresponding vertical gas delivery holes 34 of "1", "4", "2", "6", "3" and "5", wherein the vertical gas delivery holes 34 of "4" and "6" are respectively connected to the corresponding horizontal gas delivery holes 327 through connecting transverse holes 341, and the outer ends of the connecting transverse holes 341 are blocked with plugs 342.

[0035] like Figure 1 As shown, the distributor plate 4 divides the compressed air chamber 32 into a compressed air discharge chamber 322 at the front end and a rear counterbore 328 at the rear end for conveying compressed air. Figure 7 As shown, three compressed air discharge holes 323 arranged side by side extend vertically upward from the lower middle side of the distributor body 3, one of which is connected to the lower part of the compressed air discharge chamber 322, and the other two compressed air discharge holes 323 are connected to the two sides of the compressed air discharge chamber 322 through symmetrically inclined inclined holes 324, and the outer ends of the inclined holes 324 are blocked with screw plugs 342. The centers of the six horizontal air delivery holes in a circle are evenly distributed on the horizontal air delivery hole axis distribution circle 325 of the rear counterbore annular surface 321.

[0036] The cross center line of the horizontal gas delivery hole axis distribution circle 325 divides the rear counterbore annular surface 321 into four quadrants of the rectangular coordinate system I to IV. The six horizontal gas delivery holes arranged counterclockwise are located in the four quadrants I to IV. The counterclockwise arrangement order of the six horizontal gas delivery holes 327 is 1', 4', 2', 6', 3' and 5'; one end of the six horizontal gas delivery holes 327 is respectively connected vertically to the lower ends of the corresponding vertical gas delivery holes 34 of "1", "4", "2", "6", "3" and "5". The six horizontal gas delivery holes 327 are distributed in the four quadrants as follows: 3' in quadrant I, 5' and 1' in quadrant II, 4' in quadrant III, and 2' and 6' in quadrant IV; the angle between the center line of the 5' horizontal gas delivery hole and the vertical line of the cross center line of the horizontal gas delivery hole axis distribution circle is α = 25°.

[0037] like Figure 1 and Figure 8As shown, the left side of the distributor disk 4 is adjacent to the compressed air discharge chamber 322, and an arc-shaped air inlet groove 41 is provided on the upper left side of the distributor disk 4, and two air inlet holes 411 are provided in the arc-shaped air inlet groove 41 that cross the distributor disk. The arc-shaped air inlet groove 41 prolongs the compressed air supply time and improves the reliability of pneumatic success under low compressed air pressure conditions. A horseshoe-shaped air discharge groove 42 that exceeds a semicircle is provided on the lower left side of the distributor disk 4, and the center arc line of the arc-shaped air inlet groove 41 and the center arc line of the horseshoe-shaped air discharge groove 42 are concentric circles 422, and the concentric circles 422 coincide with a circle of six horizontal air delivery hole axis distribution circles 325. The two ends of the horseshoe-shaped air discharge groove 42 are respectively bent inward to form a transverse groove 421, and the end of the transverse groove 421 is connected to the compressed air discharge chamber 322. The ratio of the central angle β of the two ends of the arc-shaped air intake groove 41 to the circumference of 360° is 0.17, so that the arc-shaped air intake groove 41 is connected to the two horizontal air delivery holes 327 to ensure the air intake of the two cylinders. The ratio of the central angle γ of the two ends of the horseshoe-shaped discharge air groove 42 to the circumference of 360° is 0.69 to ensure that the horseshoe-shaped discharge air groove 42 is connected to the remaining four horizontal air delivery holes 327. As a result, the compressed air enters the relevant cylinders in the expected order through the arc-shaped air intake groove 41 and the vertical air delivery hole 34, pushing the piston downward to cold start the crankshaft; at this time, the remaining compressed air in the remaining cylinders is discharged to the outside of the distributor body 3 through the vertical air delivery hole 34, the horizontal air delivery hole 327, the horseshoe-shaped discharge air groove 42, the compressed air discharge chamber 322 and the compressed air discharge hole 323 in turn, so as to prevent the remaining compressed air from causing gas flow disorder, affecting the supply of compressed air, and indirectly affecting the start of the diesel engine. The depth h1 of the arc-shaped air inlet groove is equal to the depth h2 of the horseshoe-shaped air discharge groove, both of which are 5 mm in this embodiment; the width b1 of the arc-shaped air inlet groove is equal to the width b2 of the horseshoe-shaped air discharge groove, both of which are 5 mm in this embodiment and match the diameters of the horizontal air delivery holes 327 respectively.

[0038] like Figure 6 and Figure 8 As shown, the positioning inclined hole 326 is located on the upper rear side of the distributor body 3 and the outer peripheral surface of the distributor disk 4. The axis of the positioning inclined hole is located in the second quadrant of the rectangular coordinate system formed by the cross center line of the horizontal gas transmission hole axis distribution circle 325, and the angle between the positioning inclined hole and the vertical line of the cross center line of the axis distribution circle is δ=25°.

[0039] like Figure 1 As shown, two inner lubricating oil storage ring grooves 21 are provided between the middle of the outer circumference of the speed regulating rod 2 and the inner circumference of the adjacent bushing 5, and two outer lubricating oil storage ring grooves 311 are provided between the outer circumference of the bushing 5 and one end of the central through hole 31 of the distributor body. The inner lubricating oil storage ring grooves 21 and the outer lubricating oil storage ring grooves are connected by a plurality of transverse holes 52 penetrating the bushing. Figure 5As shown, the horizontally placed lubricating oil inlet hole 35 enters the distributor body 3 and communicates with the central through hole 31 of the distributor body. One end of the right-angled lubricating oil drain hole 36 is connected to the central through hole 31 of the distributor body, and the other end leads to the front end surface of the distributor body 3. The lubricating oil input from the lubricating oil inlet hole 35 lubricates the speed regulating rod 2 and the bushing 5 through the central through hole 31 of the distributor body—the inner lubricating oil storage ring groove 21—the transverse hole 52—the outer lubricating oil storage ring groove 311, and also stores lubricating oil in the inner lubricating oil storage ring groove 21 and the outer lubricating oil storage ring groove 311 to ensure that the speed regulating rod 2 and the bushing 5 are fully lubricated. The remaining lubricating oil is discharged from the distributor body 3 through the right-angled lubricating oil drain hole 36, and then returns to the lubricating oil tank through the lubrication pipeline.

[0040] The assembly method of the present invention comprises the following steps:

[0041] 1) Install the bushing 5 and the oil seal 6 into the two ends of the central through hole 31 of the distributor body respectively. First, press the bushing 5 into the left end of the central through hole 31 of the distributor body so that the shoulder 51 at the left end of the bushing 5 rests on the left end of the distributor body 3, and then embed the oil seal 6 into the right end of the central through hole 31 of the distributor body.

[0042] 2) The speed regulating rod 2 is installed into the central through hole 31 of the distributor body, and the distributor disc 4 is fixed on the right end of the speed regulating rod 2 by means of a conical surface fit and fixed connection, and the nut 11 on the end screw 22 of the right end of the speed regulating rod 2 is tightened to limit the axial position of the distributor disc 4. Then the left end of the speed regulating rod 2 passes through the inner hole of the bushing 5 and extends out of the right end of the distributor body 3, so that the left side of the distributor disc 4 abuts against the rear countersunk annular surface 321, thereby dividing the compressed air chamber 32 into the front compressed air discharge chamber 322 and the rear countersunk hole 328 at the rear end.

[0043] 3) Install the transmission gear 1, fix the transmission gear 1 on one end of the speed regulating rod 2 by means of a conical surface fit and fixation connection, and limit the axial position of the transmission gear 1 by screwing the nut 11 on the end screw 22 at the left end of the speed regulating rod 2.

[0044] 4) The distributor disk 4 is precisely positioned on the rear countersunk annular surface 321, the control pin 8 is inserted into the positioning inclined hole 326 on the upper side of the distributor, and the speed regulating lever 2 is turned counterclockwise until the lower end of the control pin 8 is inserted into the lower positioning inclined hole 412 on the outer peripheral surface of the distributor disk 4, so that the initial relative positions of the six horizontal air delivery holes 327 on the rear countersunk annular surface 321 and the arc-shaped air inlet groove 41 and the horseshoe-shaped air discharge groove 42 of the distributor disk 4 are positioned. At this time, the arc-shaped air inlet groove 41 is located in the second quadrant of the rectangular coordinate system formed by the cross center line of the horizontal air delivery hole axis distribution circle 325, the 5' horizontal air delivery hole and part of the 1' horizontal air delivery hole are located in the arc-shaped air inlet groove 41, and the remaining horizontal air delivery holes 327 are all located in the horseshoe-shaped air discharge groove 42.

[0045] 5) Install the rear end cover 7. After fixing the rear end cover 7 on the distributor plate 4, the control pin 8 can be pulled out, and the upper end of the positioning inclined hole 326 can be closed with the screw plug 342 to complete the assembly of the marine six-cylinder diesel engine starting compressed air distributor.

[0046] When the present invention is working, the compressed air enters the cylinder according to the following path: compressed air input hole 71-central counterbore 72-intake hole 411-compressed air chamber 32-arc-shaped intake groove 41-5' horizontal air delivery hole-"5" vertical air delivery hole, and then enters the 5# cylinder through the air delivery pipeline to push the piston downward, and starts to drive the crankshaft to rotate counterclockwise through the crank, and drives the camshaft 10 to rotate at the same time, and then drives the speed regulating rod 2 and the distributor plate 4 to rotate counterclockwise by 60° through the camshaft driving gear 101 and the transmission gear 1 in turn, and then the compressed air enters the 4# cylinder according to the above path, pushing the piston of the 4# cylinder downward. Therefore, according to the ignition sequence of the diesel engine, the compressed air enters each cylinder in turn to drive the crankshaft to rotate. Since the horseshoe-shaped air relief groove encompasses the remaining four horizontal air supply holes 327, the compressed air input from the compressed air input hole 71 cannot enter the remaining four cylinders. The compressed air in the remaining four cylinders is discharged out of the distributor body 3 through the horseshoe-shaped air relief groove 42, the compressed air relief chamber 322 and the lubricating oil drain hole 36 in turn, and will not interfere with the operation of the starting cylinder.

[0047] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the protection scope required by the present invention.

Claims

1. A compressed air distributor for starting a marine six-cylinder diesel engine, characterized in that: It includes a transmission gear, a speed regulating rod, a distributor body, a distributor plate, a bushing, an oil seal and a rear end cover. The transmission gear is fixedly connected to one end of the speed regulating rod and is axially limited by a nut screwed on one end of the speed regulating rod. The transmission gear is meshed with the camshaft driving gear; the bushing is embedded in one end of the central through hole of the distributor body, and the other end of the central through hole of the distributor body is connected to the rear countersunk hole of the distributor body; the shoulder at one end of the bushing is adjacent to one side of the transmission gear, and the other end of the bushing is against the oil seal embedded in the other end of the central through hole of the distributor body, thereby separating the front of the distributor body through the oil seal. The bushing is connected to the stepped compressed air chamber at the rear of the distributor body, and the other end of the speed regulating rod is fixedly connected to the distributor disc and axially limited by a nut; the distributor disc is located in the rear countersunk hole, and the rear end cover is fixed to the flange at the other end of the distributor body; the compressed air input hole entering from one side of the rear end cover is vertically connected to the central countersunk hole inside the rear end cover; the 6 vertical air delivery holes on the upper side of the middle of the distributor body are respectively connected to the corresponding cylinder body through their respective connecting pipelines, and the vertical air delivery holes are respectively connected to a circle of 6 horizontal air delivery holes evenly distributed in the center of the rear countersunk annulus; The six vertical air delivery holes on the upper middle part of the distributor body are divided into two rows, front and rear, in the direction toward the transmission gear. The four vertical air delivery holes in the front row are marked "4", "5", "3" and "2" from left to right, respectively, and are connected to the corresponding 4#, 5#, 3# and 2# cylinders through air delivery pipes; the two vertical air delivery holes in the rear row are marked "1" and "6" from left to right, respectively, and are connected to the corresponding 1# and 6# cylinders through air delivery pipes; The distributor plate divides the compressed air chamber into a compressed air discharge chamber at the front end and a rear countersunk hole at the rear end for conveying compressed air. Three compressed air discharge holes arranged side by side extend vertically upward from the lower side of the middle part of the distributor body, one of which is communicated with the lower part of the compressed air discharge chamber, and the other two compressed air discharge holes are respectively communicated with the two sides of the compressed air discharge chamber through symmetrically inclined inclined holes; the centers of the six horizontal air delivery holes in the circle are evenly distributed on the horizontal air delivery hole axis distribution circle of the rear countersunk hole annulus; The cross center line of the horizontal gas delivery hole axis distribution circle divides the rear countersunk hole annulus into four quadrants of rectangular coordinate system Ⅰ to Ⅳ. The six horizontal gas delivery holes arranged counterclockwise are located in the four quadrants Ⅰ to Ⅳ. The counterclockwise arrangement order of the six horizontal gas delivery holes is 1', 4', 2', 6', 3' and 5'; one end of the six horizontal gas delivery holes is respectively vertically connected to the lower ends of the corresponding vertical gas delivery holes "1", "4", "2", "6", "3" and "5" in pairs; the six horizontal gas delivery holes are distributed in the four quadrants as follows: 3' in quadrant Ⅰ, 5' and 1' in quadrant Ⅱ, 4' in quadrant Ⅲ, and 2' and 6' in quadrant Ⅳ; wherein the angle between the center line of the 5' horizontal gas delivery hole and the vertical line of the cross center line of the horizontal gas delivery hole axis distribution circle is α=25°; One side of the distributor disk is adjacent to the compressed air discharge chamber, and an arc-shaped air inlet groove is provided on the upper part of one side of the distributor disk, and two air inlet holes that cross the distributor disk are provided in the arc-shaped air inlet groove; a horseshoe-shaped air discharge groove that exceeds a semicircle is provided on the lower part of one side of the distributor disk, and the central arc line of the arc-shaped air inlet groove and the central arc line of the horseshoe-shaped air discharge groove are concentric circles, and the concentric circles coincide with a circle of six horizontal air delivery hole axis distribution circles; the two ends of the horseshoe-shaped air discharge groove are respectively bent inward to form transverse grooves, and the ends of the transverse grooves are communicated with the compressed air discharge chamber; The ratio of the central angle β of the two ends of the arc-shaped air inlet groove to the circumference of 360° is 0.17, and the ratio of the central angle γ of the two ends of the horseshoe-shaped air discharge groove to the circumference of 360° is 0.69; The depth h1 of the arc-shaped air inlet groove is equal to the depth h2 of the horseshoe-shaped air discharge groove, and the width b1 of the arc-shaped air inlet groove is equal to the width b2 of the horseshoe-shaped air discharge groove, and they are respectively matched with the diameters of the horizontal air delivery holes.

2. The starting compressed air distributor for a marine six-cylinder diesel engine according to claim 1, characterized in that: The positioning inclined hole is located on the upper rear side of the distributor body and the outer peripheral surface of the distributor plate. The axis of the positioning inclined hole is located in the second quadrant of the rectangular coordinate system formed by the cross center line of the horizontal gas transmission hole axis distribution circle, and the angle between the positioning inclined hole and the vertical line of the cross center line of the axis distribution circle is δ=25°.

3. The starting compressed air distributor for a marine six-cylinder diesel engine according to claim 1, characterized in that: A plurality of inner lubricating oil storage ring grooves are arranged between the middle of the outer circumference of the speed regulating rod and the inner circumference of the adjacent bushing, and a plurality of outer lubricating oil storage ring grooves are arranged between the outer circumference of the bushing and one end of the central through hole of the distributor body, and the inner lubricating oil storage ring grooves and the outer lubricating oil storage ring grooves are respectively connected by a plurality of transverse holes penetrating the bushing; the transverse lubricating oil inlet hole enters the distributor body and communicates with the central through hole of the distributor body, one end of the right-angled lubricating oil drain hole is connected with the outer lubricating oil storage ring groove, and the other end of the lubricating oil drain hole leads to the front end surface of the distributor body.

4. A method for assembling a starting compressed air distributor for a marine six-cylinder diesel engine according to any one of claims 1 to 3, characterized in that: The following steps are involved: 1) Install the bushing and oil seal into the two ends of the central through hole of the distributor body respectively. First, press the bushing into one end of the central through hole of the distributor body so that the shoulder of one end of the bushing rests on one end of the distributor body, and then embed the oil seal into the other end of the central through hole of the distributor body; 2) The speed regulating rod is installed into the central through hole of the distributor body, and the distributor disc is fixed on the other end of the speed regulating rod by means of a conical surface fit and fixed connection. The nut on the end screw at the other end of the speed regulating rod is tightened to limit the axial position of the distributor disc. Then, one end of the speed regulating rod is passed through the inner hole of the bushing and then extends out of one end of the distributor body, so that one side of the distributor disc abuts against the rear countersunk annular surface, thereby dividing the compressed air chamber into a front compressed air discharge chamber and a rear countersunk hole at the rear end for conveying compressed air. 3) Install the transmission gear, fix the transmission gear on one end of the speed regulating rod by means of cone-fitting fixed connection, and limit the axial position of the transmission gear by screwing a nut on the end screw at one end of the speed regulating rod; 4) The distributor plate is accurately positioned on the rear countersunk annular surface, the control pin is inserted into the positioning inclined hole on the upper side of the distributor, and the speed regulating lever is turned counterclockwise until the lower end of the control pin is inserted into the lower positioning inclined hole on the outer peripheral surface of the distributor plate, so that the initial relative positions of the 6 horizontal air delivery holes on the rear countersunk annular surface and the arc-shaped air inlet groove and horseshoe-shaped air discharge groove of the distributor plate are positioned; at this time, the arc-shaped air inlet groove is located in the second quadrant of the rectangular coordinate system formed by the cross center line of the horizontal air delivery hole axis distribution circle, the 5' horizontal air delivery hole and part of the 1' horizontal air delivery hole are located in the arc-shaped air inlet groove, and the remaining horizontal air delivery holes are all located in the horseshoe-shaped air discharge groove; 5) Install the rear end cover. After fixing the rear end cover on the other end of the distributor body, you can pull out the control pin and close the end of the positioning inclined hole with a screw plug to complete the assembly of the marine six-cylinder diesel engine starting compressed air distributor.

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