阅读说明：本技术 一种大功率柴油机燃油切断控制气缸 (Fuel oil cut-off control cylinder of high-power diesel engine ) 是由 刘志刚 黄欣欣 刘洋 郭庆 于 2019-10-23 设计创作，主要内容包括：本发明属于柴油机燃油控制、调节技术领域,涉及一种大功率柴油机燃油切断控制气缸,包括缸体、分别固定安装在缸体前后两端的前端盖和后端盖,前端盖中穿设有后端与缸体内壁相切的断油活塞,断油活塞外套设有推动断油活塞沿缸体长度方向移动的控制活塞,控制活塞前端的缸体上开设有燃油控制进气口,断油活塞后端的缸体上开设有燃油切断进气口,前端盖、缸体与控制活塞形成的密闭空间为控制气缸,缸体、控制活塞、断油活塞形成的密闭空间为切断气缸,该控制气缸安装在柴油机上,能够调节喷油泵燃油量,控制进入燃烧室的燃油量,实现柴油机低速限油、紧急停车功能。(The invention belongs to the technical field of fuel control and regulation of diesel engines, and relates to a fuel cut-off control cylinder of a high-power diesel engine, which comprises a cylinder body, a front end cover and a rear end cover, wherein the front end cover and the rear end cover are respectively and fixedly arranged at the front end and the rear end of the cylinder body, a fuel cut-off piston with the rear end tangent to the inner wall of the cylinder body penetrates through the front end cover, a control piston for pushing the fuel cut-off piston to move along the length direction of the cylinder body is sleeved outside the fuel cut-off piston, a fuel control air inlet is formed in the cylinder body at the front end of the control piston, a fuel cut-off air inlet is formed in the cylinder body at the rear end of the fuel cut-off piston, the control cylinder is installed on a diesel engine, can adjust the fuel quantity of a fuel injection pump, controls the fuel quantity entering a combustion chamber, and achieves the functions of low-speed fuel limiting and emergency stop of the diesel engine.)

1. The fuel oil cut-off control cylinder of the high-power diesel engine is characterized by comprising a cylinder body, a front end cover and a rear end cover, wherein the front end cover and the rear end cover are fixedly installed at the front end and the rear end of the cylinder body respectively, a fuel oil cut-off piston with the rear end tangent to the inner wall of the cylinder body penetrates through the front end cover, a control piston for pushing the fuel oil cut-off piston to move along the length direction of the cylinder body is sleeved outside the fuel oil cut-off piston, a fuel oil control air inlet with a fuel oil control electromagnetic valve is formed in the cylinder body at the front end of the control piston, a fuel oil cut-off air inlet with the fuel oil cut-off electromagnetic valve is formed in the cylinder body at the rear end of the fuel oil cut-off piston.

2. The fuel cut-off control cylinder for the high-power diesel engine according to claim 1, wherein a spring is fixedly installed on one side of the fuel cut-off piston close to the rear end cover, and an adjusting bolt is assembled in the middle of the rear end cover and controls the stroke of the fuel cut-off piston by screwing in the length of the adjusting bolt.

3. The high power diesel engine fuel cut-off control cylinder of claim 2, characterized in that a connecting nut is fixedly mounted on one end of the fuel cut-off piston far away from the front end cover, and a pull ring connected with an accelerator of the fuel injection pump is hinged on the connecting nut.

4. The high power diesel fuel cutoff control cylinder of claim 3 wherein the coupling nut is a close fit with the cutoff piston.

5. The high power diesel fuel cut-off control cylinder of claim 4, wherein the front end cap, the rear end cap and the cylinder body are connected by bolt fasteners.

6. A fuel cut-off control cylinder for a high-power diesel engine according to claim 5, characterized in that the middle part of the control piston is fixedly provided with an annular block which is tangential to the inner wall of the cylinder body in an integrated manner.

7. The fuel cut-off control cylinder for the high-power diesel engine as claimed in claim 6, wherein the control piston and the fuel cut-off piston are sleeved with sealing rings at the tangency positions with the inner wall of the cylinder body.

Technical Field

The invention belongs to the technical field of diesel engine fuel control and regulation, and relates to a fuel cut-off control cylinder of a high-power diesel engine.

Background

In the working process of the diesel engine, when the rotating speed of the diesel engine is low, the air inflow of the diesel engine is low, when the sudden load of the diesel engine is too large, fuel oil can not be completely combusted and continuously emits black smoke, and meanwhile, when the diesel engine is in an emergency, the diesel engine needs to be rapidly changed from a working state to a parking state, so that the problem that the diesel engine emits black smoke at a low speed is solved, and the emergency parking is realized.

Disclosure of Invention

In view of the above, the present invention provides a fuel cut-off control cylinder for a high-power diesel engine, which is mounted on a diesel engine and is capable of adjusting the fuel amount of a fuel injection pump, controlling the fuel amount entering a combustion chamber, and implementing the functions of low-speed fuel limit and emergency stop of the diesel engine, in order to solve the problems of the existing low-speed fuel limit device and emergency stop device of the diesel engine.

In order to achieve the purpose, the invention provides a fuel oil cut-off control cylinder of a high-power diesel engine, which comprises a cylinder body, a front end cover and a rear end cover, wherein the front end cover and the rear end cover are respectively and fixedly arranged at the front end and the rear end of the cylinder body, a fuel oil cut-off piston with the rear end tangent to the inner wall of the cylinder body penetrates through the front end cover, a control piston for pushing the fuel oil cut-off piston to move along the length direction of the cylinder body is sleeved outside the fuel oil cut-off piston, a fuel oil control air inlet with a fuel oil control electromagnetic valve is formed in the cylinder body at the front end of the control piston, a fuel oil cut-off air inlet with the fuel oil cut-off electromagnetic valve is formed in the cylinder body at the rear end.

The beneficial effect of this basic scheme lies in: the fuel cut-off piston and the control piston are assembled inside the cylinder body in a mutually sleeved mode, the closed space formed by the front end cover, the cylinder body and the control piston is a control cylinder, the closed space formed by the cylinder body, the control piston and the fuel cut-off piston is a cut-off cylinder, when pressurized air enters the control cylinder through the fuel control air inlet, the pressurized air pushes the control piston to push the fuel cut-off piston, the fuel cut-off piston is externally connected with a fuel injection pump accelerator, the fuel injection pump accelerator is reduced through movement of the fuel cut-off piston, and the fuel limit function is achieved. When pressurized air enters the cut-off cylinder through the fuel cut-off air inlet, the pressurized air pushes the fuel cut-off piston, and the fuel cut-off piston pulls the fuel injection pump to a parking position.

Furthermore, a spring is fixedly mounted on one side, close to the rear end cover, of the oil cut-off piston, an adjusting bolt is assembled in the middle of the rear end cover, and the adjusting bolt controls the stroke of the oil cut-off piston through screwing in length. Has the advantages that: the cooperation of spring and adjusting bolt plays the effect of restriction fuel cut-off piston shift position, restricts the stroke of fuel cut-off piston.

Furthermore, a connecting nut is fixedly mounted at one end, far away from the front end cover, of the fuel cut-off piston, and a pull ring connected with an accelerator of the fuel injection pump is hinged to the connecting nut. Has the advantages that: the pull ring on the outer side of the connecting nut is connected with the fuel injection pump accelerator, the fuel cut-off piston is connected with the pull ring through the connecting nut, and finally the fuel injection pump accelerator is adjusted through the pull ring.

Further, the connecting nut is tightly matched with the oil-cut-off piston.

Furthermore, the front end cover, the rear end cover and the cylinder body are connected through bolt fasteners. Has the advantages that: the cylinder body is respectively fixedly connected with the front end cover and the rear end cover through the bolt fasteners, so that the cylinder body, the front end cover and the rear end cover can be conveniently disassembled and assembled.

Furthermore, the middle part of the control piston is fixedly provided with an annular block tangent to the inner wall of the cylinder body in an integrated forming way. Has the advantages that: the annular block is matched with the step in the middle of the cylinder body, so that the function of limiting the moving position of the control piston is achieved, and the stroke of the control piston is limited.

Furthermore, sealing rings are sleeved at the tangent positions of the control piston and the oil cut-off piston and the inner wall of the cylinder body.

The invention has the beneficial effects that:

the fuel oil cut-off control cylinder of the high-power diesel engine is provided with a fuel oil cut-off cylinder for cutting off fuel oil; and a fuel control cylinder connected in series is additionally arranged for controlling excessive fuel injection. Through the feedback of the rotating speed of the diesel engine and the feedback of the pressure of the pressurized air under different working conditions, the fuel oil cuts off the action of the air cylinder, and the fuel injection pump is pulled to a parking position or a fuel limit position. The fuel oil cutting cylinder integrates a fuel oil cutting function and a fuel oil control function, and is installed on a diesel engine body to achieve the functions of emergency stop and low-speed oil limit of the diesel engine. When the diesel engine needs to stop in an emergency, the diesel engine can quickly respond to and execute an oil stopping action; when the diesel engine is in low rotating speed and under the condition of sudden load increase, the oil unloading action can be quickly responded and executed, and the fuel quantity sprayed into the combustion chamber is limited, so that the duration time of black smoke emission is shortened, the oil consumption is reduced, and the emission is reduced. Meanwhile, the appearance is simple and attractive, the processing difficulty is reduced, and the manufacturing cost is reduced.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.

Drawings

For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:

fig. 1 is a schematic structural diagram of a fuel cut-off control cylinder of a high-power diesel engine.

Reference numerals: the device comprises a pull ring 1, a connecting nut 2, a front end cover 3, a cylinder body 4, a control piston 5, an oil cut-off piston 6, an adjusting bolt 7, a spring 8 and a rear end cover 9.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.

Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.

The diesel engine in the patent is a reciprocating internal combustion engine with compression ignition.

The fuel cut-off control cylinder is a part integrating a fuel cut-off function and a fuel control function.

The fuel injection pump is an important component of combustion supply, and delivers high-pressure fuel to the fuel injector at regular time, quantity and constant pressure according to the operation condition of the diesel engine and the working sequence of the cylinders.

The fuel oil cut-off control cylinder of the high-power diesel engine shown in figure 1 comprises a cylinder body 4, a front end cover 3 and a rear end cover 9, wherein the front end cover 3 and the rear end cover 9 are fixedly installed at the front end and the rear end of the cylinder body 4 respectively, and the front end cover 3, the rear end cover 9 and the cylinder body 4 are connected through bolt fasteners. The cylinder body 4 is fixedly connected with the front end cover 3 and the rear end cover 9 through bolt fasteners, so that the cylinder body 4, the front end cover 3 and the rear end cover 9 can be conveniently disassembled.

The front end cover 3 is internally provided with an oil cut-off piston 6 with the rear end tangent to the inner wall of the cylinder body 4 in a penetrating way, the oil cut-off piston 6 is externally sleeved with a control piston 5 for pushing the oil cut-off piston 6 to move along the length direction of the cylinder body 4, the middle part of the control piston 5 is fixedly provided with an annular block tangent to the inner wall of the cylinder body 4 in an integrated forming way, and the tangent parts of the control piston 5, the oil cut-off piston 6 and the inner wall of the cylinder. The block is tangent to the inner wall of the cylinder 4, and the rear part of the oil-cut piston 6 is tangent to the inner wall of the cylinder 4.

A fuel control air inlet with a fuel control electromagnetic valve is formed in the cylinder body 4 at the front end of the control piston 5, a fuel cutting air inlet with a fuel cutting electromagnetic valve is formed in the cylinder body 4 at the rear end of the fuel cut-off piston 6, a closed space formed by the front end cover 3, the cylinder body 4 and the control piston 5 is a control cylinder, and a closed space formed by the cylinder body 4, the control piston 5 and the fuel cut-off piston 6 is a cutting cylinder. The one end fixed mounting that front end housing 3 was kept away from to fuel cut-off piston 6 has coupling nut 2, and the last articulated pull ring 1 that is connected with the injection pump throttle that has of coupling nut 2. One side of the oil cut-off piston 6 close to the rear end cover 9 is fixedly provided with a spring 8, the middle part of the rear end cover 9 is provided with an adjusting bolt 7, and the adjusting bolt 7 controls the stroke of the oil cut-off piston 6 by screwing in the length.

In the fuel oil cut-off control cylinder, a closed space formed by the front end cover 3, the cylinder body 4 and the control piston 5 is a control cylinder, and a closed space formed by the cylinder body 4, the control piston 5 and the fuel cut-off piston 6 is a cut-off cylinder. When pressurized air enters the control cylinder, the pressurized air pushes the control piston 5 to push the fuel cut-off piston 6, the fuel cut-off piston 6 is connected with the pull ring 1 through the connecting nut 2, and finally the throttle of the fuel injection pump is reduced through the pull ring 1 to realize the fuel limit function. When the pressurized air enters the cutting cylinder, the pressurized air pushes the oil cut-off piston 6, the oil cut-off piston 6 drives the pull ring 1 to act, and finally the oil injection pump is pulled to a parking position through the pull ring 1, so that the oil stop action is realized.

The fuel oil cut-off control cylinder of the high-power diesel engine ingeniously connects the fuel oil control cylinder and the fuel oil cut-off cylinder in series, so that the integrated control of fuel oil cut-off and control is realized, the fuel oil control cylinder and the fuel oil cut-off cylinder are omitted from being processed respectively, the processing difficulty is reduced, and the manufacturing cost is reduced.

Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.