Marine diesel engine lubricating oil pressure regulating device

Abstract

The application discloses a marine diesel engine lubricating oil pressure regulating device, which comprises a centrifugal filter support, an opening pressure regulating assembly, a pressure regulating valve assembly and a pressure limiting valve. The centrifugal filter support is fixed on one side of a marine diesel engine body, and the opening pressure regulating assembly and the pressure regulating valve assembly are connected in front and back and cross the middle part of the centrifugal filter support. The centrifugal filter support is a box structure, and the box is divided into a lubricating oil inlet cavity and a lubricating oil return cavity by an intermediate partition plate. The pressure regulating valve assembly comprises a pilot pressure regulating mechanism and a pressure regulating piston. The pilot pressure regulating mechanism comprises a pilot control lubricating oil channel and a pilot end cover. The application significantly reduces construction cost, improves construction efficiency and working reliability of a lubricating system. The lubricating oil pressure fluctuation is small, the pressure regulating valve is flexible in opening and closing, and the pressure lubrication effect of the marine diesel engine is significantly improved.

Description

Technical Field

[0001] This invention relates to an oil control device, and more particularly to a device for adjusting the oil pressure of a diesel engine, belonging to the field of internal combustion engine technology. Background Technology

[0002] Pressure circulating lubrication is one of the main lubrication methods for diesel engines. It uses an oil pump to pressurize lubricating oil and continuously deliver it to the friction surfaces of moving parts such as main bearings, connecting rod bearings, and camshaft bearings. With sufficient oil supply, these moving parts receive good lubrication. Pressure lubricating oil also has cleaning and strong cooling effects. The diesel engine's oil pump provides a stable supply of pressure lubricating oil, and the pressure regulating valve in the pressure circulating lubrication system maintains a stable overall lubricating oil pressure, ensuring that an oil film forms on all lubricated parts to meet the expected operating requirements.

[0003] Existing diesel engine lubrication systems connect to independent devices and components such as oil pumps, coolers, filters, thermostatic valves, and pressure regulating valves via numerous pipelines, resulting in complex installation. Over time, pipeline joints are prone to leaks, causing lubricating oil to flow everywhere and contaminate the diesel engine's working environment. This also leads to reduced lubrication pressure, severely impacting lubrication and causing frequent engine malfunctions. In particular, the lubricating oil pressure used to control the opening and closing of the pressure regulating valve is the pressure of the medium that has already flowed through the oil filter, oil cooler, and other valves. With prolonged use, the pressure differential in the cooler increases due to fouling, and the pressure differential in the filter also increases. This causes significant fluctuations in the lubricating oil pressure entering the pressure regulating valve, significantly affecting the piston movement of the pressure regulating valve or causing abnormal movement of the main piston. This results in malfunction of the pressure regulating device and severely affects the lubrication of the moving parts of the diesel engine. Summary of the Invention

[0004] The purpose of this invention is to provide a marine diesel engine lubricating oil pressure regulating device that is compact in structure, has no connecting pipelines, and offers flexible pressure adjustment.

[0005] This invention is achieved through the following technical solution:

[0006] A marine diesel engine lubricating oil pressure regulating device includes a centrifugal filter support, an opening pressure regulating assembly, a pressure regulating valve assembly, and a pressure limiting valve disposed below the pressure regulating valve assembly. The centrifugal filter support is fixed to one side of the marine diesel engine body. The opening pressure regulating assembly and the pressure regulating valve assembly are connected front to back and pass through the middle of the centrifugal filter support. The pressure regulating assembly is disposed on one side of the centrifugal filter support, and the opening pressure regulating assembly is disposed on the other side of the centrifugal filter support. The opening pressure regulating assembly includes a protective cover, an adjusting screw, a pressure regulating end cap, a pressure regulating spring, a pressure regulating spring seat, and a locking nut. The centrifugal filter support has a box structure, and a pressure regulating pipe extending horizontally outward at one end is provided in the middle of one side of the box. The end cap is fixed to the outer end of the pressure regulating pipe. The pressure regulating spring seat is embedded in the outer end of the inner hole of the pressure regulating pipe. One end of the adjusting screw, which is screwed into the center of the pressure regulating end cap, extends into the pressure regulating pipe and abuts against the countersunk hole at one end of the pressure regulating spring seat. The adjusting screw is locked by a locking nut. One end of the pressure regulating spring abuts against one end of the pressure regulating spring seat. The protective cover that covers the other end of the adjusting screw is fixed to the outside of the pressure regulating end cap. The housing is divided into an oil inlet chamber at one corner and an oil return chamber in the rest of the housing by a right-angled middle partition. The oil inlet pipe port and the oil return pipe port in the diesel engine body are respectively connected to the oil inlet chamber and the oil return chamber of the corresponding centrifugal filter support.

[0007] The pressure regulating valve assembly includes a pilot pressure regulating mechanism and a pressure regulating piston. The pressure regulating piston has a stepped shaft structure. One end of the large end of the stepped shaft is axially provided with a central stepped countersunk hole. The other end of the adjusting spring abuts against the bottom of the large end hole at one end of the central stepped countersunk hole. One end of the large end shaft is supported in a pressure regulating pipe. A pilot chamber extends inward from the middle of one side wall of the housing. One end of the small end of the stepped shaft is supported in the central hole of the side wall of the pilot chamber. The transverse hole of the pressure regulating piston passes through the other end of the central stepped countersunk hole. A lubricating oil pressure release buffer mechanism is provided at the junction of the large end shaft and the small end shaft and between the stepped hole at the upper part of the intermediate partition.

[0008] The pilot pressure regulating mechanism includes a pilot control lubricating oil passage and a pilot end cap. The lower end of the pilot control lubricating oil passage, which is vertically arranged in the upper part of one side of the centrifugal filter support, communicates with the pilot chamber. The upper end of the pilot control lubricating oil passage is connected to the output end of the lubricating oil pump of the marine diesel engine through an input oil pipe. One end of the small end of the stepped shaft passes through the through hole in the side wall of the pilot chamber and is supported in the pilot end cap countersunk hole at one end of the pilot end cap. The flange at the other end of the pilot end cap is fixed to the other side of the housing.

[0009] The objectives of this invention can also be further achieved through the following technical measures.

[0010] Furthermore, the pressure limiting valve includes a pressure limiting valve housing, a control piston, a return spring, and a retaining ring for the orifice. The pressure limiting valve housing is horizontally positioned below the pressure regulating piston. The open end bushing of the pressure limiting valve housing is supported on the intermediate partition plate, and the open end bushing communicates with the lubricating oil inlet chamber through the countersunk hole of the pressure limiting valve housing. The closed end flange of the pressure limiting valve housing is fixed to the outer side of the side wall of the lubricating oil return chamber. The control piston is embedded in the pressure limiting valve housing. One end of the return spring is supported in one end of the countersunk hole of the pressure limiting valve housing, and the other end of the return spring abuts against one end of the control piston. Several unloading transverse holes are evenly distributed on the end of the pressure limiting valve housing near the intermediate partition plate. The other end of the pressure limiting valve housing away from the intermediate partition plate is provided with oil drain transverse holes that traverse the pressure limiting valve housing vertically. The diameter of the unloading transverse holes is larger than the diameter of the oil drain transverse holes. In the initial state, the control piston closes the unloading transverse holes. The retaining ring for the orifice is radially embedded in one end of the countersunk hole of the control piston.

[0011] Furthermore, the lubricating oil pressure release buffer mechanism includes a stepped hole in the intermediate partition plate and several radially evenly distributed ramps at the junction of the large end shaft and the small end shaft of the pressure regulating piston. The small end hole of the stepped hole in the intermediate partition plate matches the large end shaft of the pressure regulating piston. The threaded end of the large end shaft is supported in one end of the pressure regulating tube, and the middle threaded section of the small end shaft is supported in the through hole in the side wall of the pilot chamber.

[0012] Furthermore, one end of the pilot end cap countersunk hole is provided with several pilot transverse holes that communicate with the pilot cavity.

[0013] Furthermore, one end of the adjusting screw is spherical, and the spherical surface abuts against the bottom conical surface of the countersunk hole at one end of the pressure adjusting spring seat.

[0014] Furthermore, the control piston of the pressure relief valve has a symmetrical bow-shaped cut at the end away from the return spring, and the bow-shaped cut communicates with the countersunk hole of the control piston.

[0015] This invention integrates an opening pressure regulating component, a pressure regulating valve component, and a pressure limiting valve into a centrifugal filter support, eliminating the need for pipe and fitting connections, significantly reducing construction costs, improving construction efficiency, and enhancing the reliability of the lubrication system. This invention uses pilot-pressure lubricating oil to drive the pressure regulating piston, and employs a lubricating oil pressure release buffer mechanism to buffer the pressure lubricating oil, ensuring smooth opening and closing of the lubricating oil inlet and outlet chambers. The lubricating oil pressure controlling the opening and closing of the pressure regulating valve comes directly from the pressure lubricating oil output from the lubricating oil pump, without needing filters, coolers, or other valves. This results in minimal lubricating oil pressure fluctuations, flexible opening and closing of the pressure regulating valve, and significantly improved pressure lubrication performance in marine diesel engines.

[0016] The advantages and features of the present invention will be illustrated and explained through the following non-limiting description of preferred embodiments, which are given by way of example only with reference to the accompanying drawings. 。 Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention;

[0018] Figure 2 yes Figure 1 AA section view;

[0019] Figure 3 yes Figure 1 The BB cross-sectional view shows that the pressure regulating piston has moved to the open position to the left.

[0020] Figure 4 yes Figure 2 Enlarged view of Part I;

[0021] Figure 5 It is a magnified 3D diagram of the control piston. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] like Figure 1 and Figure 2 As shown, the present invention includes a centrifugal filter support 1, an opening pressure regulating assembly 2, a pressure regulating valve assembly 3, and a pressure limiting valve 4 disposed on the lower side of the pressure regulating valve assembly 3. The centrifugal filter support 1 is fixed on the right side of the marine diesel engine body 5. The opening pressure regulating assembly 2 and the pressure regulating valve assembly 3 are connected front to back and pass through the middle of the centrifugal filter support 1. Figure 2 As shown, the pressure regulating valve assembly 3 is located on the right side of the centrifugal filter support 1, and the pressure regulating assembly 2 is located on the left side of the centrifugal filter support 1. The pressure regulating assembly 2 includes a protective cover 21, an adjusting screw 22, a pressure regulating end cap 23, a pressure regulating spring 24, a pressure regulating spring seat 25, and a locking nut 26. The centrifugal filter support 1 has a box structure. A pressure regulating tube 11 extending horizontally outward is provided in the middle of the left side of the box. The pressure regulating end cap 23 is fixed on the outer end of the pressure regulating tube 11. The pressure regulating spring seat 25 is embedded in the outer end of the inner hole of the pressure regulating tube 11. The right end of the adjusting screw 22, which is screwed into the center of the pressure regulating end cap 23, extends into the pressure regulating tube 11 and abuts against the countersunk hole 251 at the left end of the pressure regulating spring seat 25. The adjusting screw 22 is locked by the locking nut 26 to prevent the position of the adjusting screw 22 from changing due to vibration and affecting the pressure regulating effect. The right end of the adjusting screw 22 is a spherical surface 221. The spherical surface 221 abuts against the bottom conical surface of the countersunk hole 251, which can improve the contact stability between the end of the adjusting screw 22 and the bottom conical surface of the countersunk hole 251, and facilitate the adjustment of the preload of the adjusting spring 24.

[0024] The left end of the pressure regulating spring 24 abuts against the annular groove 252 at the right end of the pressure regulating spring seat 25, and the protective cover 21, which covers the left end of the adjusting screw 22, is fixed to the outer end port of the pressure regulating pipe 11. The housing is divided into the lubricating oil inlet chamber 13 in the upper left corner of the housing and the lubricating oil return chamber 14 in the rest of the housing by a right-angled middle partition 12. The lubricating oil inlet pipe 51 and the lubricating oil return pipe 52 in the diesel engine body 5 are respectively connected to the lubricating oil inlet chamber 13 and the lubricating oil return chamber 14 of the corresponding centrifugal filter support 1.

[0025] The pressure regulating valve assembly 3 includes a pilot pressure regulating mechanism 31 and a pressure regulating piston 32. The pressure regulating piston 32 has a stepped shaft structure. One end of the large end shaft 321 of the stepped shaft has a central stepped countersunk hole 324. The right end of the pressure regulating spring 24 abuts against the bottom of the large end hole at the left end of the central stepped countersunk hole 324. The left end of the large end shaft 321 is supported in the pressure regulating pipe 11. A pilot chamber 151 extends inward from the middle of the right side wall 15 of the housing. The right end of the small end shaft 322 of the stepped shaft is supported in the central hole 152 of the side wall of the pilot chamber 151. A lubricating oil pressure release buffer mechanism 33 is provided at the junction of the large end shaft 321 and the small end shaft 322 and between the stepped hole 153 at the upper part of the intermediate partition.

[0026] The pilot pressure regulating mechanism 31 includes a pilot control lubricating oil passage 311 and a pilot end cap 312. The lower end of the pilot control lubricating oil passage 311, which is vertically arranged in the upper right part of the centrifugal filter support 1, communicates with the pilot chamber 151. The upper end of the pilot lubricating oil control passage 311 is connected to the output end of the lubricating oil pump of the marine diesel engine through the input oil pipe 16. The right end of the small end shaft 322 of the stepped shaft passes through the through hole 152 in the side wall of the pilot chamber and is supported in the pilot end cap countersunk hole 313 on the left end of the pilot end cap 312. The right end flange of the pilot end cap 312 is fixed to the outside of the right side of the housing.

[0027] like Figure 3 As shown, the pressure relief valve 4 includes a pressure relief valve housing 41, a control piston 42, a return spring 43, and a retaining ring 44 for the bore. The pressure relief valve housing 41 is horizontally positioned below the pressure regulating piston 32. The open end bushing 411 at the left end of the pressure relief valve housing 41 is supported on the intermediate partition plate 12, and the open end bushing 411 communicates with the lubricating oil inlet chamber 13 through the countersunk hole 411 of the pressure relief valve housing. The closed end flange 412 at the right end of the pressure relief valve housing 41 is fixed to the outer side surface of the right side wall 15 of the lubricating oil return chamber 14. The control piston 42 is embedded in the pressure relief valve housing 41. The right end of the return spring 43 is supported in the right end of the countersunk hole 413 of the pressure relief valve housing, and the left end of the return spring 43 abuts against the right end of the control piston 42. Four unloading transverse holes 415 are evenly distributed on the right end of the pressure relief valve housing 41 near the middle partition 12. The left end of the pressure relief valve housing 41 away from the middle partition 12 is provided with oil drain transverse holes 416 that run vertically through the pressure relief valve housing 41. The diameter of the unloading transverse holes 415 is larger than the diameter of the oil drain transverse holes 416. Figure 3In the initial state, the control piston 42 closes the unloading transverse hole 415, and the oil drain transverse hole 416 allows lubricating oil to enter the counterbore 413 of the pressure relief valve housing to lubricate the return spring 43, thereby making the return spring 43 more sensitive.

[0028] like Figure 3 and Figure 5 As shown, the control piston 42 of the pressure relief valve 4 has a symmetrical bow-shaped notch 421 at the end away from the return spring 33, and the bow-shaped notch 421 communicates with the countersunk hole 422 of the control piston. When the lubricating oil pressure in the lubricating oil inlet chamber 13 exceeds the 0.65 MPa set by the return spring 43, the return spring 43 is compressed by the control piston 42 and opens the lubricating oil unloading passage, so that the pressurized lubricating oil in the lubricating oil inlet chamber 13 flows into the lubricating oil return chamber 14 through the control piston 42, releasing the excessive lubricating oil pressure in the lubricating oil inlet chamber 13 and ensuring the safety of the diesel engine lubrication system. The retaining ring 44 is radially embedded in the left end of the countersunk hole 422 of the control piston to limit the control piston 42 and prevent it from dislodging from the pressure relief valve housing 41.

[0029] like Figure 2 and Figure 4 As shown, a lubricating oil pressure release buffer mechanism 33 is provided at the junction of the large end shaft 321 and the small end shaft 322 of the pressure regulating piston 32 and between the intermediate partition plate stepped hole 153. This mechanism includes the intermediate partition plate stepped hole 153 and four radially evenly distributed ramps 323 at the junction of the large end shaft 321 and the small end shaft 322 of the pressure regulating piston 32. The small end hole of the intermediate partition plate stepped hole 153 matches the large end shaft 321 of the pressure regulating piston 32. The threaded end 325 of the large end shaft is supported in the right end of the pressure regulating pipe 11, and the middle threaded section 326 of the small end shaft 322 is supported in the through hole 152 on the side wall of the pilot chamber. When the pilot pressure lubricating oil pushes the pressure regulating piston 32 from... Figure 4 When the double-dotted line position is shifted to the left, the ramp 323 gradually opens the channel between the intermediate partition stepped hole 153 and the large end shaft 321, thereby gradually increasing the conduction area between the lubricating oil inlet chamber 13 and the lubricating oil return chamber 14. This effectively avoids the impact of pressurized lubricating oil on the lubricating oil return chamber 14, improving the reliability of the invention. A layer of lubricating oil film is stored between the threaded end 325 of the large end shaft and the inner hole of the pressure regulating pipe 11, and between the middle threaded section 326 of the small end shaft 322 and the through hole 152 on the side wall of the pilot chamber, making the opening and closing movement of the pressure regulating piston 32 more flexible. The transverse hole 327 of the pressure regulating piston passes through the right end of the central stepped countersunk hole 324 of the pressure regulating piston 32, facilitating the entry of pressurized lubricating oil into the central stepped countersunk hole 324 to lubricate the pressure regulating spring 24.

[0030] like Figure 2As shown, the left end of the pilot end cover 312 is provided with two pilot transverse holes 314 that communicate with the pilot cavity 151, so that the pressure lubricating oil can enter the pilot cavity 151 from the pilot control lubricating oil passage 311 to push the pressure regulating piston 32 to move to the left and open.

[0031] like Figure 1 As shown, pressurized lubricating oil from the lubricating oil pump of the marine diesel engine enters the pilot control lubricating oil passage 311 through the input oil pipe 16. The pressurized lubricating oil... Figure 2 The oil flows in the direction indicated by the middle arrow along the following path: pilot control lubricating oil passage 311 → pilot chamber 151 → pilot transverse hole 314 → pilot end cap countersunk hole 313, thereby pushing the pressure regulating piston 32 to move to the left and open. It is not affected by the lubricating oil pressure fluctuations of lubricating devices such as filters and coolers, thus improving the lubrication quality of marine diesel engines and ensuring the safe and reliable operation of marine diesel engines.

[0032] In addition to the above embodiments, the present invention may have other implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. A marine diesel engine lubricating oil pressure regulating device, comprising a centrifugal filter support, an opening pressure regulating assembly, and a pressure regulating valve assembly, wherein the centrifugal filter support is fixed to one side of the marine diesel engine body, and the opening pressure regulating assembly and the pressure regulating valve assembly are connected front to rear and pass through the middle of the centrifugal filter support, wherein... The pressure regulating assembly is located on one side of the centrifugal filter support, and the opening pressure regulating assembly is located on the other side of the centrifugal filter support. The opening pressure regulating assembly includes a protective cover, an adjusting screw, a pressure regulating end cap, a pressure regulating spring, a pressure regulating spring seat, and a locking nut. The centrifugal filter support is a box structure. A pressure regulating tube extending horizontally outward is provided in the middle of one side of the box. The pressure regulating end cap is fixed to the outer end of the pressure regulating tube. The pressure regulating spring seat is embedded in the outer end of the inner hole of the pressure regulating tube. One end of the adjusting screw, which is screwed into the center of the pressure regulating end cap, extends into the pressure regulating tube and abuts against it. The pressure regulating spring seat has a countersunk hole at one end, and the adjusting screw is locked by a locking nut; one end of the pressure regulating spring abuts against one end of the pressure regulating spring seat, and a protective cover covering the other end of the adjusting screw is fixed outside the pressure regulating end cover; the feature is that it also includes a pressure limiting valve set on the lower side of the pressure regulating valve assembly, and the housing is divided into a lubricating oil inlet chamber at one corner of the housing and a lubricating oil return chamber in the rest of the housing by a right-angled middle partition, and the lubricating oil inlet pipe port and the lubricating oil return pipe port in the diesel engine body are respectively connected to the lubricating oil inlet chamber and the lubricating oil return chamber of the corresponding centrifugal filter support; The pressure regulating valve assembly includes a pilot pressure regulating mechanism and a pressure regulating piston. The pressure regulating piston has a stepped shaft structure. One end of the large end of the stepped shaft is axially provided with a central stepped countersunk hole. The other end of the pressure regulating spring abuts against the bottom of the large end hole at one end of the central stepped countersunk hole. One end of the large end shaft is supported in the pressure regulating tube. A pilot chamber extends inward from one side wall of the housing. One end of the small end of the stepped shaft is supported in the central hole of the side wall of the pilot chamber. The transverse hole of the pressure regulating piston passes through the other end of the central stepped countersunk hole. A lubricating oil pressure release buffer mechanism is provided at the junction of the large end shaft and the small end shaft and between the stepped hole at the upper part of the intermediate partition. The pilot pressure regulating mechanism includes a pilot control lubricating oil passage and a pilot end cap. The lower end of the pilot control lubricating oil passage, which is vertically arranged in the upper part of one side of the centrifugal filter support, communicates with the pilot chamber. The upper end of the pilot control lubricating oil passage is connected to the output end of the lubricating oil pump of the marine diesel engine through an input oil pipe. One end of the small end of the stepped shaft passes through the side wall of the pilot chamber and is supported in the pilot end cap countersunk hole at one end of the pilot end cap. The flange at the other end of the pilot end cap is fixed to the outside of the other side of the housing. The pressure limiting valve includes a pressure limiting valve body, a control piston, a return spring, and a retaining ring for the orifice. The pressure limiting valve body is horizontally positioned below the pressure regulating piston. The open end of the pressure limiting valve body is supported by a bushing on the intermediate partition, and the open end bushing communicates with the lubricating oil inlet chamber through a countersunk hole in the pressure limiting valve body. The closed end flange of the pressure limiting valve body is fixed to the outer side of the side wall of the lubricating oil return chamber. The control piston is embedded in the pressure limiting valve body. One end of the return spring is supported in one end of the countersunk hole in the pressure limiting valve body, and the other end of the return spring abuts against one end of the control piston. Several unloading transverse holes are evenly distributed on one end of the pressure limiting valve body near the intermediate partition. The other end of the pressure limiting valve body away from the intermediate partition has oil drain transverse holes that traverse the pressure limiting valve body vertically. The diameter of the unloading transverse holes is larger than the diameter of the oil drain transverse holes. In the initial state, the control piston closes the unloading transverse holes. The retaining ring for the orifice is radially embedded in one end of the countersunk hole of the control piston. The lubricating oil pressure release buffer mechanism includes a stepped hole in the intermediate partition plate and several radially evenly distributed ramps at the junction of the large end shaft and the small end shaft of the pressure regulating piston. The small end hole of the stepped hole in the intermediate partition plate matches the large end shaft of the pressure regulating piston. The threaded end of the large end shaft is supported in one end of the pressure regulating tube, and the middle threaded section of the small end shaft is supported in the through hole on the side wall of the pilot chamber.

2. The marine diesel engine lubricating oil pressure regulating device as described in claim 1, characterized in that, The pilot end cap has several pilot transverse holes communicating with the pilot cavity at one end of the countersunk hole.

3. The marine diesel engine lubricating oil pressure regulating device as described in claim 1, characterized in that, The control piston of the pressure relief valve has a symmetrical bow-shaped cut at the end away from the reset spring, and the bow-shaped cut communicates with the countersunk hole of the control piston.

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