Oil quantity limiting compensation device and diesel engine

Abstract

The utility model discloses a fuel quantity limit compensation device and a diesel engine, relates to the technical field of diesel engines, and aims to solve the problem of excessive fuel supply when the existing engine accelerates or decelerates suddenly, the fuel quantity limit compensation device is applied to the engine, and the device comprises a limit ejector rod, a shell, a piston assembly and an elastic piece, the limiting ejector rod is arranged on an oil adjusting shaft of an engine, an inner cavity of the shell communicates with the supercharger, the piston assembly is movably arranged on the shell, the supercharger is used for providing pressure for driving the piston assembly to move towards the limiting ejector rod so that one end of the piston assembly can abut against the limiting ejector rod, and the elastic piece is arranged on the shell. The elastic piece is used for providing restoring force enabling the piston assembly to move in the direction far away from the limiting ejector rod, in this way, quick response can be achieved under the transient working condition of the engine, the maximum oil supply amount of the engine is limited, fuel oil is effectively prevented from being supplied excessively, and then the engine is prevented from emitting black smoke.

Description

Technical Field

[0001] The utility model relates to the technical field of diesel engines, and more particularly to an oil limit compensation device and a diesel engine. Background Art

[0002] Diesel engines burn diesel fuel to generate energy. During engine operation, especially during transient conditions such as rapid acceleration or deceleration, the inertia of the fuel supply system can easily lead to oversupply of fuel, causing the engine to emit large amounts of incompletely burned black smoke. This not only pollutes the environment but also reduces engine efficiency.

[0003] Therefore, how to solve the problem of excessive fuel supply during rapid acceleration or deceleration of the existing engine is an urgent problem to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the purpose of the present invention is to provide an oil limit compensation device that can respond quickly under transient engine conditions and limit the maximum fuel supply of the engine, thereby effectively preventing excessive fuel supply and thus avoiding black smoke from the engine.

[0005] Another object of the present utility model is to provide a diesel engine including the above-mentioned oil quantity limit compensation device, which can improve the environmental protection performance and operating efficiency of the diesel engine.

[0006] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0007] An oil level limit compensation device is applied to an engine, and the oil level limit compensation device includes:

[0008] A limit push rod is provided on the oil regulating shaft of the engine;

[0009] a housing, wherein an inner cavity of the housing is connected to the supercharger;

[0010] The piston assembly is movably disposed in the housing, and the booster is used to provide pressure to drive the piston assembly to move toward the limiting ejector rod so that one end of the piston assembly abuts against the limiting ejector rod;

[0011] The elastic member is arranged on the housing and is used for providing a restoring force to move the piston assembly in a direction away from the limiting ejector rod.

[0012] Preferably, the piston assembly includes a compensating piston, which is disposed in the housing, and an outer periphery of the compensating piston is sealed to an inner wall of the housing.

[0013] Preferably, the piston assembly further comprises a piston rod, one end of which is connected to the compensating piston, and the other end of the piston rod extends out of the housing and is connected to the limit block.

[0014] Preferably, the housing includes a main body and a limiting portion, the main body is provided with an interface connected to the supercharger, the limiting portion is provided with a contraction opening matched with the piston rod, and a fixing plate is provided inside the limiting portion.

[0015] Preferably, the elastic member is a spring, one end of the spring is connected to the compensation piston, and the other end of the spring is connected to the fixed plate.

[0016] Preferably, one spring is provided and is sleeved on the outer circumference of the piston rod.

[0017] Preferably, there are a plurality of springs, which are arranged around the outer circumference of the piston rod.

[0018] A diesel engine is connected to a supercharger, and the supercharger is connected to the oil limit compensation device as described in any one of the above items.

[0019] Preferably, the diesel engine includes a speed governor for driving the oil regulating shaft, and the speed governor is connected to the control device via a signal.

[0020] The oil quantity limiting and compensating device provided by the utility model is applied to an engine, and the oil quantity limiting and compensating device includes a limiting push rod, a shell, a piston assembly and an elastic member. Specifically, the limiting push rod is arranged on the oil regulating shaft of the engine, the inner cavity of the shell is connected with the supercharger, and the piston assembly is movably arranged on the shell. The supercharger is used to provide pressure to drive the piston assembly to move close to the limiting push rod so that one end of the piston assembly abuts against the limiting push rod. When the engine is in a transient working condition, the boosted air pressure output by the supercharger will change, and this change is transmitted to the piston assembly, driving the piston assembly to move in the direction close to the limiting push rod. When the piston assembly abuts against the limiting push rod, the oil regulating shaft can no longer pull the oil dipstick of the fuel injection pump, thereby limiting the fuel supply, and thus preventing the problem of black smoke caused by excessive oil volume.

[0021] The elastic member is provided in the housing and is used to provide a restoring force to move the piston assembly in a direction away from the limit push rod. When the compressed air provided by the supercharger drives the piston assembly to move toward the limit push rod, the elastic member is compressed. By providing the elastic member, the piston assembly is prevented from colliding in the housing due to excessive movement speed, resulting in wear or damage. At the same time, when the engine returns to normal operating state, the pressure of the boosted air output by the supercharger will change, and this change is transmitted to the housing. The pressure at this time is smaller than the previous pressure, that is, the drive to the piston assembly is removed, and the piston assembly returns to its initial position under the action of the restoring force of the elastic member, and is separated from the limit push rod to avoid affecting the normal operation of the oil regulating shaft.

[0022] The oil quantity limit compensation device set up in the above manner controls the oil quantity by the boosted air pressure output by the supercharger. The device can respond quickly under transient engine conditions and limit the oil quantity by changing the extension and contraction of the piston assembly, thereby preventing the engine from emitting black smoke. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0024] Figure 1 This is a structural schematic diagram of the oil limit compensation device provided by the utility model.

[0025] Reference numerals:

[0026] 10-Oil adjustment shaft;

[0027] 1-Limiting ejector rod;

[0028] 2-shell;

[0029] 3-piston assembly, 31-compensating piston, 32-piston rod, 33-limiting block;

[0030] 4- elastic member;

[0031] 5-Fixed plate. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0034] The utility model discloses a core provides a kind of oil quantity limit compensation device, can be under the quick response of engine transient condition, the maximum oil supply of engine is limited, to effectively prevent fuel supply excess, and then avoid engine black smoke.This utility model discloses another core provides a kind of diesel engine comprising the oil quantity limit compensation device described above, can improve the environmental protection performance and operating efficiency of diesel engine.

[0035] Please refer to Figure 1 An oil quantity limit compensation device is arranged in an engine, and the oil quantity limit compensation device comprises a limit jack 1, a shell 2, a piston assembly 3 and an elastic member 4.

[0036] Specifically, the limit jack 1 is applied to an oil regulating shaft 10 of the engine, the inner cavity of the shell 2 is connected with a supercharger, the piston assembly 3 is movably arranged in the shell 2, and the supercharger is used to provide pressure for driving the piston assembly 3 to move close to the limit jack 1, so that one end of the piston assembly 3 abuts against the limit jack 1. When the engine is in a transient condition, the boost air pressure output by the supercharger will change, and the change is transmitted to the piston assembly 3, so as to drive the piston assembly 3 to move close to the limit jack 1. When the piston assembly 3 abuts against the limit jack 1, the oil regulating shaft 10 cannot continue to pull the oil pump ruler at this time, so as to limit the fuel supply amount, and then prevent the problem of black smoke caused by excessive oil amount.

[0037] The elastic member 4 is arranged in the shell 2 and is used to provide a restoring force for driving the piston assembly 3 to move away from the limit jack 1. When the supercharger provides compressed air for driving the piston assembly 3 to move close to the limit jack 1, the elastic member 4 is compressed. By arranging the elastic member 4, the piston assembly 3 can be prevented from colliding in the shell 2 due to too high moving speed, so as to avoid abrasion or damage. At the same time, when the engine returns to a normal operating state, the boost air pressure output by the supercharger will change, and the change is transmitted to the shell 2. At this time, the pressure is smaller than the previous pressure, that is, the driving of the piston assembly 3 is removed. Under the action of the restoring force of the elastic member 4, the piston assembly 3 returns to the initial position and is separated from the limit jack 1, so as to avoid affecting the normal work of the oil regulating shaft 10.

[0038] The oil quantity limit compensation device arranged in the above manner is controlled by the boost air pressure output by the supercharger. The device can quickly respond under the engine transient condition, limit the oil amount by changing the extension amount of the piston assembly 3, and prevent the engine from emitting black smoke.

[0039] In the above embodiment, the piston assembly 3 comprises a compensation piston 31, the compensation piston 31 is arranged in the shell 2, and the outer periphery of the compensation piston 31 is sealingly connected with the inner wall of the shell 2.

[0040] It should be noted that the compensating piston 31 is arranged inside the shell 2 and is used to sense the pressure changes inside the shell 2. In this embodiment, when the pressure of the compressed air provided by the supercharger to the shell 2 increases and is greater than the friction force of the compensating piston 31 relative to the shell 2, the compensating piston 31 is pushed to move toward the direction close to the limit push rod 1.

[0041] A sealing ring is provided on the outer periphery of the compensating piston 31 to achieve a sealing effect so that the compressed air provided by the supercharger to the housing 2 will not leak.

[0042] In the above case, the piston assembly 3 further includes a piston rod 32 , one end of the piston rod 32 is connected to the compensation piston 31 , and the other end of the piston rod 32 extends out of the housing 2 and is connected to the limit block 33 .

[0043] It can be understood that the piston rod 32 passes through the housing 2, and its extension and contraction amount is controlled by the amount of compressed air provided to the housing 2 by the supercharger. By setting a limit block 33 to limit the movement stroke of the piston rod 32, when the engine is transiently accelerated or the load suddenly changes, the boosted air pressure output by the supercharger will change and be transmitted to the compensation piston 31 and the piston rod 32 to move synchronously in the direction close to the limit push rod 1. When the limit block 33 abuts the limit push rod 1, the oil adjustment shaft 10 can no longer pull the oil dipstick of the injection pump, thereby limiting the fuel supply and preventing the problem of black smoke caused by excessive oil.

[0044] Furthermore, the housing 2 includes a main body and a limiting portion. The main body is provided with an interface connected to the supercharger, the limiting portion is provided with a contraction opening matched with the piston rod 32, and a fixing plate 5 is provided inside the limiting portion.

[0045] It should be noted that, in this embodiment, the housing 2 includes two parts. The main body is used to compensate for the movement of the piston 31 and is connected to the supercharger through the compensating intake pipe. The limiting part is set as a contraction structure, which on the one hand limits the stroke of the compensating piston 31, and on the other hand plays a guiding role in the movement of the piston rod 32.

[0046] In the above embodiment, the elastic member 4 is a spring, one end of the spring is connected to the compensation piston 31 , and the other end of the spring is connected to the fixing plate 5 .

[0047] It can be understood that the end of the spring connected to the fixed plate 5 is the fixed end, and the end of the spring connected to the compensation piston 31 is the movable end. When the pressurized air output by the supercharger pushes the compensation piston 31 to move toward the fixed plate 5, the spring is compressed. When the pressurized air output by the supercharger decreases, the compensation piston 31 moves to the initial position under the action of the restoring force of the spring.

[0048] By setting the spring, the piston assembly 3 can be avoided from colliding in the shell 2 due to the speed of movement is too fast, resulting in wear or damage, but also to the compensation piston 31 and the piston rod 32 reset effect, in practical application, when the engine is in transient state, the supercharger output pressure of the supercharged air will change and be transmitted to the compensation piston 31, the compensation piston 31 will compress the spring after feeling the pressure change, and at the same time drive the piston rod 32 and the limit block 33 to move towards the limit top rod 1, until the limit block 33 and the limit top rod 1 abut; when the engine returns to normal operating state, the compensation piston 31 moves under the action of the restoring force of the spring after feeling the pressure change, and at the same time drives the piston rod 32 and the limit block 33 to move away from the limit top rod 1, so that the limit block 33 and the limit top rod 1 are separated, so that the oil regulating shaft 10 returns to the normal working state.

[0049] In an embodiment, the spring is provided with one, and is sleeved on the outer periphery of the piston rod 32. This kind of setting mode is simple in structure and low in cost.

[0050] In another embodiment, the spring is provided with a plurality of springs, and the plurality of springs are arranged around the outer periphery of the piston rod 32. Compared with the mode of providing only one spring, the service life is longer, and when one of the springs fails, the other springs can still function.

[0051] A diesel engine, the diesel engine is connected with a supercharger, and the supercharger is connected with the oil quantity limit compensation device as described above.

[0052] It should be noted that the oil quantity limit compensation device controlled by the compressed air provided by the supercharger can limit the maximum oil supply of the engine according to the working condition of the supercharger when the load of the engine suddenly changes, thereby effectively preventing the problem of black smoke caused by too much oil injection, and improving the environmental performance and operating efficiency of the engine.

[0053] In the above case, the diesel engine includes a speed regulator for driving the oil regulating shaft 10, and the speed regulator is signal connected with the control device.

[0054] Under different speed and load conditions, the speed regulator of the engine drives the oil regulating shaft 10, and the oil regulating shaft 10 pulls the oil level of the high-pressure oil pump for adjustment. When the load suddenly increases, the speed regulator will drive the oil regulating shaft 10 to push the oil level to increase the oil injection amount of the high-pressure oil pump, and because the response rate of the supercharger is relatively slow, the supercharging pressure follow-up rate is also slow, at this time the limit block 33 of the oil quantity limit compensation device will stop the limit top rod 1 installed on the oil regulating shaft 10, and the high-pressure oil pump will not be allowed to inject too much oil, thereby reducing the problem of black smoke caused by too much oil injection and insufficient intake of supercharged air.

[0055] The supercharger is working during the entire process of engine operation, and it is always providing pressurized air to the oil limit compensation device. However, when the load changes suddenly, the transient response speed of the supercharger is slow, and it is impossible to change transiently when the load suddenly changes. The supercharger has an improvement process, which is mainly to limit the excess fuel injection when the load suddenly changes. After the supercharger responds, the pressurized air increases, and the problem of increased fuel injection and insufficient pressurized air and black smoke will not occur.

[0056] In addition to the diesel engine disclosed in the above embodiments, the structures of other parts of the diesel engine can be referred to the prior art and will not be described in detail herein.

[0057] In summary, the oil quantity limit compensation device provided by the present invention, through supercharger control of the oil quantity limit compensation device, can limit the maximum engine fuel supply according to the supercharger's operating conditions when the engine load suddenly changes, thereby effectively preventing the problem of black smoke caused by overinjection and improving the engine's environmental performance and operating efficiency. The mechanical structure of the supercharger-controlled maximum fuel injection quantity is simple and easy to operate, making it an effective and faster oil quantity limit compensation device.

[0058] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0059] The above is a detailed introduction to the oil limit compensation device and diesel engine provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core concept of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified. These improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An oil limit compensation device, characterized in that: Applied to an engine, the oil level limit compensation device comprises: A limiting push rod (1) is provided on the oil regulating shaft (10) of the engine; A housing (2), wherein an inner cavity of the housing (2) is connected to the supercharger; A piston assembly (3) is movably arranged on the housing (2), and the booster is used to provide pressure to drive the piston assembly (3) to move closer to the limiting push rod (1), so that one end of the piston assembly (3) abuts against the limiting push rod (1); An elastic member (4) is provided on the housing (2), and the elastic member (4) is used to provide a restoring force that causes the piston assembly (3) to move in a direction away from the limiting push rod (1).

2. The oil level limit compensation device according to claim 1, characterized in that: The piston assembly (3) comprises a compensating piston (31), the compensating piston (31) is arranged in the housing (2), and the outer periphery of the compensating piston (31) is sealedly connected to the inner wall of the housing (2).

3. The oil level limit compensation device according to claim 2, characterized in that: The piston assembly (3) further comprises a piston rod (32), one end of which is connected to the compensating piston (31), and the other end of which extends out of the housing (2) and is connected to a limit block (33).

4. The oil level limiting compensation device according to claim 3, characterized in that: The housing (2) comprises a main body and a limiting portion, the main body being provided with an interface connected to the supercharger, the limiting portion being provided with a contraction opening cooperating with the piston rod (32), and a fixing plate (5) being provided inside the limiting portion.

5. The oil level limiting compensation device according to claim 4, characterized in that: The elastic member (4) is a spring, one end of the spring is connected to the compensation piston (31), and the other end of the spring is connected to the fixed plate (5).

6. The oil level limiting compensation device according to claim 5, characterized in that: The spring is provided and is sleeved on the outer circumference of the piston rod (32).

7. The oil level limiting and compensating device according to claim 5, characterized in that: A plurality of springs are provided, and the plurality of springs are arranged around the outer circumference of the piston rod (32).

8. A diesel engine, characterized in that: The diesel engine is connected to a supercharger, and the supercharger is connected to the oil level limit compensation device according to any one of claims 1 to 7.

9. The diesel engine according to claim 8, characterized in that The diesel engine comprises a speed regulator for driving an oil regulating shaft (10), and the speed regulator is connected to a control device by signal.

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