Diesel engine pre-injection oil line arrangement

Abstract

The application provides a diesel engine pre-lubricating oil pipeline device, wherein an electric pre-lubricating oil pump is connected to pipeline I, a mechanical lubricating oil pump is connected to pipeline II, the oil outlets of pipeline I and pipeline II are respectively communicated with a valve port I and a valve port III of a valve device for flow distribution, a valve port II of the valve device is communicated with a lubricating oil inlet of the diesel engine, when the electric pre-lubricating oil pump is started, the valve port III, the valve port I and the valve port II of the valve device are communicated and flow distribution is carried out, then the mechanical lubricating oil pump and the diesel engine are lubricated by pipeline I, when the electric pre-lubricating oil pump is stopped, the valve port III and the valve port II of the valve device are communicated and the diesel engine is lubricated by pipeline II. The application solves the problem of pre-lubrication not in place and frequent low-pressure lubricating oil alarm of the diesel engine caused by unreasonable pre-lubricating design, and selects a small-power electric pre-lubricating oil pump, thereby reducing energy consumption and maintenance cost, and improving the starting reliability and safety of the diesel engine.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of diesel engine, and particularly relates to a diesel engine pre-machine oil pipeline device. BACKGROUND

[0002] There are many metal friction pairs in a diesel engine, such as piston rings and cylinder sleeves, rollers and cam plates, shafts and bearing shells, and gears and gears, and one of the prerequisites for normal operation of the diesel engine is good lubrication, otherwise, phenomena such as alarms and shutdowns may occur. The function of the diesel engine oil system is to lubricate the surface of the friction pair components, reduce the wear of the surface of the friction pair, reduce the movement resistance, improve the work efficiency, and also has the cooling effect.

[0003] At present, the diesel engine needs to be fully pre-lubricated by an electric pre-oil pump before starting, and the diesel engine starts after the electric pre-oil pump is started. During the starting process, when the diesel engine reaches a certain speed, the electric pre-oil pump stops working, and the diesel engine belt oil pump starts to work to provide diesel engine oil lubrication, ensuring the normal operation of the diesel engine. In the traditional oil lubrication system, the electric pre-oil pump and the diesel engine belt oil pump have a handover work, and there is an alarm phenomenon due to low oil pressure, which affects the work reliability and service life of the diesel engine. With the increase of the power and volume of the diesel engine, the volume of the oil belt pump also gradually increases, and this alarm phenomenon is more prominent. After analyzing the design principle of oil lubrication and the pre-lubrication and starting process of the diesel engine, the following deficiencies are found: ① Most of the diesel engine belt oil pumps are gear pumps, and there are objective internal leaks such as gear backlash and gap between gear and shell. In the case of internal leakage, in order to ensure the pre-oil pressure of the diesel engine, the flow and pressure of the electric pre-oil pump must be increased, which increases the consumption of electric energy and maintenance costs during use. ② Due to the existence of the internal gap of the diesel engine belt oil pump, and the gap is greater than the oil gap between the metal friction pairs of the diesel engine, and the sum of the friction pair resistance in the diesel engine is much greater than the manufacturing gap of the diesel engine belt oil pump, a large amount of electric pre-oil pump oil will flow through the gap of the diesel engine belt oil pump and return to the diesel engine belt oil sump when the diesel engine is stationary (before starting pre-lubrication), which will lead to insufficient pre-lubrication of individual friction pairs in the diesel engine, and the diesel engine oil low pressure alarm may occur during the starting process of the diesel engine, affecting the service life of the diesel engine parts. Therefore, it is necessary to improve the above problems. SUMMARY

[0004] The technical problem solved by this invention is to provide a pre-lubricating oil pipeline device for diesel engines. By improving the pipeline integration design and incorporating a valve device in the pipeline, the invention effectively solves the problem of inadequate pre-lubrication and frequent low-pressure oil alarms caused by unreasonable pre-lubrication design of diesel engines, while ensuring the pre-lubricating oil pressure of the diesel engine. An electric pre-lubricating oil pump with a lower flow rate and power can be selected to reduce energy consumption and maintenance costs. The invention also effectively and reliably achieves sealing, ensuring the accuracy of low-pressure oil alarms during diesel engine starting, and improving the reliability and safety of diesel engine starting.

[0005] The technical solution adopted in this invention is as follows: a lubricating oil pipeline device before the diesel engine, including a pipeline 1 and a pipeline 2, both of which have their inlet ends connected to the engine oil pan. An electric pre-supply lubricating oil pump is connected to pipeline 1, and an engine oil pump is connected to pipeline 2. The outlets of pipeline 1 and pipeline 2 are respectively connected to port 1 and port 3 of a valve device for flow distribution. Port 2 of the valve device is connected to the lubricating oil inlet of the diesel engine. When the electric pre-supply lubricating oil pump is started, port 3, port 1, and port 2 of the valve device are connected and flow distribution is performed. Then, pipeline 1 supplies oil lubrication to the engine oil pump and the inside of the diesel engine. When the electric pre-supply lubricating oil pump is stopped, port 3 and port 2 of the valve device are connected, and pipeline 2 supplies oil lubrication to the inside of the diesel engine smoothly and stably.

[0006] The valve disc device includes a valve disc body, which has an internal cavity. The upper end face, left end face, and front end face of the valve disc body are respectively provided with a pipe port one, a pipe port two, and a pipe port three that communicate with each other through the internal cavity. The lower end and upper end of the internal cavity are respectively connected to the pipe port three and the pipe port one, and the left end of the internal cavity is connected to the pipe port two. The valve disc body is provided with a spring-type on / off assembly for controlling the connection and disconnection between the pipe port one and the internal cavity, as well as the flow area between the pipe port three and the internal cavity.

[0007] Furthermore, the spring-type on / off assembly includes a solid valve disc, a perforated valve disc, a spring, and a valve disc shaft. A sealing ring is fixed on the inner wall of one port of the valve disc body, and a valve disc shaft is centrally distributed inside the valve disc body, located within the inner cavity and the sealing ring. The valve disc shaft is fitted with a spring, a solid valve disc for controlling the connection between port one and the inner cavity, and a perforated valve disc for controlling the flow area between port three and the inner cavity. The upper and lower ends of the spring are radially positioned at the middle of the solid valve disc and the perforated valve disc, respectively. Under the action of the spring, the solid valve disc and the perforated valve disc abut against the lower end face of the sealing ring and the lower end of the inner cavity, respectively, thereby achieving the control of disconnecting port one from the inner cavity and minimizing the flow rate between port three and the inner cavity.

[0008] Furthermore, the inner ring surface at the lower end of the sealing ring is a conical surface, and the conical ring surface at the lower end of the solid valve disc abuts against the conical surface at the lower end of the sealing ring for sealing under the action of the spring.

[0009] Further, the valve disc with holes is provided with a plurality of flow-through holes, and the valve disc with holes is in contact and sealed with the inverted conical hole wall of the convex ring upper end under the action of the spring.

[0010] Compared with the prior art, the present application has the following advantages:

[0011] 1. The technical solution integrates the pipeline design and designs the valve disc device in the pipeline, effectively solves the problem of pre-lubrication failure and frequent low-pressure alarm of the diesel engine caused by unreasonable pre-lubrication design of the diesel engine, and ensures the pre-supply oil pressure of the diesel engine.

[0012] 2. The valve disc device simplifies the connection structure of the oil supply pipeline, reduces external oil leakage points, realizes the lubrication of the internal metal friction pair of the diesel engine under the condition of ensuring the oil supply pressure, and improves the service life of the diesel engine parts.

[0013] 3. The technical solution solves the problem of increasing the flow and pressure of the electric pre-lubricating pump to ensure the pre-supply oil pressure of the diesel engine, and can select a small-scale electric pre-supply oil pump, thereby reducing energy consumption and maintenance costs.

[0014] 4. The technical solution has simple structure, novel design, effective and reliable sealing, avoids low-pressure oil alarm during starting, ensures the reliability of the diesel engine, and improves the starting reliability and safety of the diesel engine. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The figure is a schematic diagram of the structure connection of the present application.

[0016] Figure 2 The figure is a schematic diagram of the valve disc device structure of the present application. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be described below. Figures 1-2 The technical solutions in the embodiments of the present application will be described below. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0018] It is to be understood that the terms "including", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the statement "comprising a means" does not exclude the existence of additional identical elements in the process, method, article, or apparatus including the stated element.

[0019] The diesel engine pre-machine oil pipeline device, as shown in Figure 1 The oil inlet end of the pipeline 2 and the pipeline 3 are connected with the oil pan 1 of the diesel engine 5. The pipeline 2 is connected with the electric pre-supply oil pump 6, and the pipeline 3 is connected with the oil pump 7 of the diesel engine 5. The oil outlet of the pipeline 2 and the pipeline 3 are respectively connected with the pipe port 4-9 and the pipe port 4-11 of the valve device 4 for flow distribution. The pipe port 4-10 of the valve device 4 is connected with the oil inlet port of the diesel engine 5. When the electric pre-supply oil pump 6 is started, the pipe port 4-11, the pipe port 4-9 and the pipe port 4-10 of the valve device 4 are connected and the flow is distributed, and then the oil is supplied to the oil pump 7 of the diesel engine 5 and the internal lubrication of the diesel engine 5 through the pipeline 2. When the electric pre-supply oil pump 6 is stopped, the pipe port 4-11 and the pipe port 4-10 of the valve device 4 are connected and the oil is supplied to the internal lubrication of the diesel engine 5 through the pipeline 3. In the above structure, by improving the pipeline integration design and designing the valve device 4 in the pipeline, the problem of pre-lubrication not in place and frequent diesel engine oil low pressure alarm caused by unreasonable pre-lubrication design of the diesel engine is effectively solved under the premise of ensuring the pre-supply oil pressure of the diesel engine. The problem of increasing the flow and pressure of the electric pre-supply oil pump to ensure the pre-supply oil pressure of the diesel engine is solved. The electric pre-supply oil pump 6 with optional flow and power is selected, the energy consumption and maintenance cost are reduced.

[0020] As shown in Figure 2 The specific structure of the valve device 4 is as follows: the valve device 4 includes a valve body 4-1, an inner cavity 4-2 is formed in the valve body 4-1, and the upper end face, the left end face and the front end face of the valve body 4-1 are respectively provided with the pipe port 4-9, the pipe port 4-10 and the pipe port 4-11 which are connected with each other through the inner cavity 4-2. The lower end and the upper end of the inner cavity 4-2 are respectively connected with the pipe port 4-11 and the pipe port 4-9, and the left end of the inner cavity 4-2 is connected with the pipe port 4-10. A spring type on-off assembly for controlling the on-off of the pipe port 4-9 and the inner cavity 4-2 and the flow area of the pipe port 4-11 and the inner cavity 4-2 is arranged in the valve body 4-1.

[0021] As shown in Figure 2As shown, the specific structure of the spring type on-off assembly is as follows: the spring type on-off assembly comprises a solid valve disc 4-6, a hole valve disc 4-7, a spring 4-5, and a valve disc shaft 4-4, the inner wall of the pipe orifice one 4-9 of the valve body 4-1 is fixed with a sealing ring 4-3, and the valve disc shaft 4-4 is arranged in the inner cavity 4-2 and the sealing ring 4-3 in the valve body 4-1, the spring 4-5, the solid valve disc 4-6 for controlling the on-off of the pipe orifice one 4-9 and the inner cavity 4-2, and the hole valve disc 4-7 for controlling the flow area of the pipe orifice three 4-11 and the inner cavity 4-2 are sleeved on the valve disc shaft 4-4, the upper and lower ends of the spring 4-5 are respectively located in the middle part of the solid valve disc 4-6 and the hole valve disc 4-7 in the radial direction, and the solid valve disc 4-6 and the hole valve disc 4-7 are respectively abutted on the lower end surface of the sealing ring 4-3 and the convex ring at the lower end of the inner cavity 4-2 under the action of the spring 4-5, so as to realize the control of the disconnection of the pipe orifice one 4-9 and the inner cavity 4-2 and the minimum flow of the pipe orifice three 4-11 and the inner cavity 4-2; in the above structure, the design of the valve disc device 4 simplifies the connection structure of the oil supply pipeline, reduces the external oil leakage points, and realizes the non-lubrication of the internal metal friction pair of the diesel engine under the condition of ensuring the oil supply pressure, thereby improving the service life of the diesel engine parts.

[0022] In the above structure, the lower end inner annular surface of the sealing ring 4-3 is a conical surface, and the conical annular surface at the lower end of the solid valve disc 4-6 is abutted on the conical surface at the lower end of the sealing ring 4-3 under the action of the spring 4-5; specifically, a plurality of flow holes 4-8 are formed on the hole valve disc 4-7, and the hole valve disc 4-7 is abutted on the outer circumferential wall of the upper end inverted conical surface of the hole valve disc 4-7 and the inverted conical hole wall of the convex ring under the action of the spring 4-5.

[0023] Working principle: when the electric pre-supply oil pump 6 works (the diesel engine is static), the solid valve disc 4-6 is opened by the oil pressure at the outlet of the electric pre-supply oil pump 6, at this time, the spring 4-5 is compressed, a part of the oil enters the inner cavity 4-2, and another part of the oil enters the cavity (formed by assembly) and the internal gap of the oil pump 7 of the diesel engine through the plurality of flow holes 4-8.

[0024] The design of the hole valve disc 4-7 can effectively control the flow distribution of the electric pre-supply oil pump 6, improve the pre-supply oil pressure of the diesel engine, and ensure the full lubrication of the internal friction pair of the diesel engine; the flow holes 4-8 realize reasonable flow distribution through throttling and pressure reduction, the oil fills the cavity (formed by assembly) and the internal gap of the oil pump 7 of the diesel engine, and fully lubricates the oil pump 7 of the diesel engine.

[0025] During the starting process of the diesel engine, the electric pre-feed oil pump 6 stops working at a certain rotating speed, the belt oil pump 7 rotates to pump oil to generate pressure and easily push away the valve disc 4-7 (the flow hole 4-8 throttles and reduces pressure, and reduces the resistance after the belt oil pump 7 pumps), and under the action of the spring 4-5, the solid valve disc 4-6 is effectively closed, so that the oil pressure of the diesel engine 5 changes smoothly, and the low oil pressure alarm during the starting process is avoided.

[0026] The technical solution has simple structure, novel design, effectively and reliably realizes sealing, avoids the low oil pressure alarm during the starting process, ensures the reliability of the diesel engine, and improves the starting reliability and safety of the diesel engine.

[0027] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0028] In addition, it should be understood that although the present application is described in the specification in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be properly combined to form other embodiments that those skilled in the art can understand.

Claims

1. A lubricating oil pipeline device before the diesel engine inlet, characterized in that: The system includes two pipelines, one (2) and two (3), whose inlets are connected to the oil pan (1) of the engine belt. The first pipeline (2) is connected to an electric pre-supply oil pump (6), and the second pipeline (3) is connected to an engine belt oil pump (7). The outlets of the first pipeline (2) and the second pipeline (3) are respectively connected to the first (4-9) and the third (4-11) of the valve device (4) for flow distribution. The second (4-10) of the valve device (4) is connected to the oil inlet of the diesel engine (5). The first (4-9) and the second pipeline are connected to the oil pan (1) of the engine belt. (3) and the position of the third pipe (4-11) are set perpendicular to each other; when the electric pre-supply lubricating oil pump (6) is started, the third pipe (4-11), the first pipe (4-9) and the second pipe (4-10) of the valve device (4) are connected and the flow is distributed. Then, the first pipe (2) supplies oil lubrication to the engine-driven lubricating oil pump (7) and the diesel engine (5) respectively. When the electric pre-supply lubricating oil pump (6) is stopped, the third pipe (4-11) and the second pipe (4-10) of the valve device (4) are connected and the second pipe (3) supplies oil lubrication to the diesel engine smoothly and stably. The valve disc device (4) includes a valve disc body (4-1), which has an inner cavity (4-2). The upper end face, left end face and front end face of the valve disc body (4-1) are respectively provided with a pipe port one (4-9), a pipe port two (4-10) and a pipe port three (4-11) that are interconnected through the inner cavity (4-2). The lower end and upper end of the inner cavity (4-2) are respectively connected to the pipe port three (4-11) and the pipe port one (4-9), and the left end of the inner cavity (4-2) is connected to the pipe port two (4-10). The valve disc body (4-1) is provided with a spring-type on / off assembly for controlling the on / off of the pipe port one (4-9) and the inner cavity (4-2) and the flow area of ​​the pipe port three (4-11) and the inner cavity (4-2). The spring-loaded on / off assembly includes a solid valve disc (4-6), a perforated valve disc (4-7), a spring (4-5), and a valve disc shaft (4-4). A sealing ring (4-3) is fixed on the inner wall of the valve disc body (4-1) at the first port (4-9). The valve disc body (4-1) is equipped with a valve disc shaft (4-4) centrally located inside the inner cavity (4-2) and the sealing ring (4-3). The valve disc shaft (4-4) is fitted with a spring (4-5) and a solid valve disc (4-6) for controlling the opening and closing of the first port (4-9) and the inner cavity (4-2). The perforated valve disc (4-7) is used to control the flow area between port 3 (4-11) and the inner cavity (4-2). The upper and lower ends of the spring (4-5) are radially positioned at the middle of the solid valve disc (4-6) and the perforated valve disc (4-7), respectively. Under the action of the spring (4-5), the solid valve disc (4-6) and the perforated valve disc (4-7) abut against the lower end face of the sealing ring (4-3) and the convex ring at the lower end of the inner cavity (4-2), respectively, so as to achieve the control of the disconnection between port 1 (4-9) and the inner cavity (4-2) and the minimum flow between port 3 (4-11) and the inner cavity (4-2).

2. The diesel engine inlet lubricating oil pipeline device according to claim 1, characterized in that: The inner surface of the lower end of the sealing ring (4-3) is a conical surface, and the conical surface of the lower end of the solid valve disc (4-6) abuts against the conical surface of the lower end of the sealing ring (4-3) under the action of the spring (4-5) to seal.

3. The diesel engine inlet lubricating oil pipeline device according to any one of claims 1-2, characterized in that: The perforated valve disc (4-7) has multiple flow holes (4-8), and under the action of the spring (4-5), the upper end of the perforated valve disc (4-7) has an inverted conical outer circumferential wall that contacts and seals with the inverted conical hole wall at the upper end of the convex ring.

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