A fuel cut-off control cylinder for a high-power diesel engine

Abstract

The present invention belongs to the technical field of diesel engine fuel control and regulation, and relates to a fuel cut-off control cylinder for a high-power diesel engine, comprising a cylinder body, a front end cover and a rear end cover respectively fixedly mounted at the front and rear ends of the cylinder body, an oil cut-off piston with a rear end tangent to the inner wall of the cylinder body is passed through the front end cover, a control piston that pushes the oil cut-off piston to move along the length direction of the cylinder body is disposed outside the oil cut-off piston, a fuel control air inlet is provided on the cylinder body at the front end of the control piston, and a fuel cut-off air inlet is provided on the cylinder body at the rear end of the oil cut-off piston, a closed space formed by the front end cover, the cylinder body and the control piston is the control cylinder, and a closed space formed by the cylinder body, the control piston and the oil cut-off piston is the cut-off cylinder, the control cylinder is mounted on the diesel engine, can adjust the fuel amount of the injection pump, control the fuel amount entering the combustion chamber, and realize the low-speed fuel limiting and emergency stop functions of the diesel engine.

Description

Technical Field

[0001] The invention belongs to the technical field of diesel engine fuel control and regulation, and relates to a fuel cut-off control cylinder for a high-power diesel engine. Background Art

[0002] During the operation of a diesel engine, when the speed is low, the air intake is low, and when the diesel engine is suddenly overloaded, the fuel cannot be completely burned and black smoke continues to be emitted. At the same time, when an emergency occurs in the diesel engine, we need to quickly change the diesel engine from a working state to a parking state. Therefore, it is very important to solve the problem of black smoke from a diesel engine at low speed and achieve emergency parking.

[0003] In the prior art, two sets of devices are used to control the problems of black smoke emission at low speed and emergency stop of diesel engines respectively, which will increase the manufacturing cost of the diesel engine body and make the body structure more complicated. It is necessary to study a fuel control device that can simultaneously solve the fuel supply problem of the diesel engine during the start and stop phases. The fuel cut-off control cylinder is the heart of the fuel control device. Therefore, it is particularly important to design an integrated fuel cut-off control cylinder that can effectively control the fuel supply during the start and stop phases of the diesel engine. Summary of the invention

[0004] In view of this, in order to solve the problems existing in the above-mentioned existing diesel engine low-speed fuel limiting device and emergency stop device, the present invention provides a high-power diesel engine fuel cut-off control cylinder. The control cylinder is installed on the diesel engine, and can adjust the fuel amount of the injection pump, control the amount of fuel entering the combustion chamber, and realize the diesel engine low-speed fuel limiting and emergency stop functions.

[0005] To achieve the above-mentioned purpose, the present invention provides a high-power diesel engine fuel cut-off control cylinder, comprising a cylinder body, a front end cover and a rear end cover respectively fixedly mounted on the front and rear ends of the cylinder body, an oil cut-off piston with a rear end tangent to the inner wall of the cylinder body is passed through the front end cover, a control piston is disposed on the outer sleeve of the oil cut-off piston for pushing the oil cut-off piston to move along the length direction of the cylinder body, a fuel control air inlet with a fuel control solenoid valve is provided on the cylinder body at the front end of the control piston, and a fuel cut-off air inlet with a fuel cut-off solenoid valve is provided on the cylinder body at the rear end of the oil cut-off piston, the enclosed space formed by the front end cover, the cylinder body and the control piston is the control cylinder, and the enclosed space formed by the cylinder body, the control piston and the oil cut-off piston is the cut-off cylinder.

[0006] The beneficial effect of this basic scheme is that the cylinder body is equipped with a mutually fitting oil cut-off piston and a control piston, wherein the enclosed space formed by the front end cover, the cylinder body and the control piston is the control cylinder, and the enclosed space formed by the cylinder body, the control piston and the oil cut-off piston is the cut-off cylinder. When the pressurized air enters the control cylinder through the fuel control air inlet, the pressurized air pushes the control piston, thereby pushing the oil cut-off piston, connecting the oil cut-off piston to the throttle of the fuel injection pump, and reducing the throttle of the fuel injection pump by moving the oil cut-off piston to realize the oil limiting function. When the pressurized air enters the cut-off cylinder through the fuel cut-off air inlet, the pressurized air pushes the oil cut-off piston, and the oil cut-off piston pulls the fuel injection pump to the parking position.

[0007] Furthermore, a spring is fixedly installed on one side of the oil cut-off piston close to the rear end cover, and an adjusting bolt is installed in the middle of the rear end cover. The adjusting bolt controls the stroke of the oil cut-off piston by screwing in the length. Beneficial effect: The cooperation of the spring and the adjusting bolt plays a role in limiting the moving position of the oil cut-off piston and limiting the stroke of the oil cut-off piston.

[0008] Furthermore, a connecting nut is fixedly installed at one end of the oil cut-off piston away from the front end cover, and a pull ring connected to the throttle of the fuel injection pump is hinged on the connecting nut. Beneficial effect: the pull ring outside the connecting nut is connected to the throttle of the fuel injection pump, the oil cut-off piston is connected to the pull ring through the connecting nut, and finally the throttle of the fuel injection pump is adjusted through the pull ring.

[0009] Furthermore, the connecting nut is tightly matched with the oil cut-off piston.

[0010] Further, the front cover, the rear cover and the cylinder body are all connected by bolt fasteners. Beneficial effect: The cylinder body is fixedly connected to the front cover and the rear cover respectively by bolt fasteners, which facilitates the disassembly and assembly of the cylinder body, the front cover and the rear cover.

[0011] Furthermore, an annular block tangent to the inner wall of the cylinder body is integrally formed and fixedly installed in the middle of the control piston. Beneficial effect: The cooperation between the annular block and the step in the middle of the cylinder body plays a role in limiting the moving position of the control piston and limiting the stroke of the control piston.

[0012] Furthermore, sealing rings are sleeved at the tangent points between the control piston, the oil cut-off piston and the inner wall of the cylinder body.

[0013] The beneficial effects of the present invention are:

[0014] The high-power diesel engine fuel cut-off control cylinder disclosed in the present invention is provided with a fuel cut-off cylinder for cutting off fuel; a series fuel control cylinder is also provided for controlling excessive fuel injection. Through the diesel engine speed feedback and the boost air pressure feedback under different working conditions, the fuel cut-off cylinder is actuated to pull the fuel injection pump to the parking position or the fuel limiting position. The fuel cut-off cylinder integrates the fuel cut-off function and the fuel control function, and the fuel cut-off cylinder is installed on the diesel engine body to realize the diesel engine emergency stop and low-speed fuel limiting functions. When the diesel engine needs to stop in an emergency situation, it can quickly respond to execute the oil stop action; when the diesel engine is at a low speed and the load is suddenly increased, it can quickly respond to execute the oil unloading action to limit the amount of fuel injected into the combustion chamber, thereby reducing the duration of black smoke, reducing fuel consumption, and reducing emissions. At the same time, the appearance is simple and beautiful, the processing difficulty is reduced, and the manufacturing cost is reduced.

[0015] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0017] Figure 1 It is a structural schematic diagram of a fuel cut-off control cylinder of a high-power diesel engine according to the present invention.

[0018] Figure numerals: pull ring 1, connecting nut 2, front end cover 3, cylinder body 4, control piston 5, oil cut-off piston 6, adjusting bolt 7, spring 8, rear end cover 9. DETAILED DESCRIPTION

[0019] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0020] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order 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 actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0021] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0022] The diesel engine in this patent is a compression ignition reciprocating internal combustion engine.

[0023] The fuel cut-off control cylinder is a component that integrates the fuel cut-off function and the fuel control function.

[0024] The fuel injection pump is an important component of the combustion supply. It delivers high-pressure fuel to the injector at a certain time, quantity and pressure according to the operating conditions of the diesel engine and the working sequence of the cylinders.

[0025] like Figure 1 The high-power diesel engine fuel cut-off control cylinder shown comprises a cylinder body 4, a front end cover 3 and a rear end cover 9 respectively fixedly mounted at the front and rear ends of the cylinder body 4, and the front end cover 3, the rear end cover 9 and the cylinder body 4 are all connected by bolt fasteners. The cylinder body 4 is fixedly connected to the front end cover 3 and the rear end cover 9 respectively by bolt fasteners, so that the cylinder body 4 and the front end cover 3 and the rear end cover 9 can be easily disassembled and assembled.

[0026] The front cover 3 is provided with an oil cut-off piston 6 whose rear end is tangent to the inner wall of the cylinder body 4. The outer sleeve of the oil cut-off piston 6 is provided with a control piston 5 that pushes 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 integrally formed with an annular block that is tangent to the inner wall of the cylinder body 4. The control piston 5 and the oil cut-off piston 6 are tangent to the inner wall of the cylinder body 4. The rear part of the oil cut-off piston 6 is tangent to the inner wall of the cylinder body 4.

[0027] A fuel control air inlet with a fuel control solenoid valve is provided on the cylinder body 4 at the front end of the control piston 5, and a fuel cut-off air inlet with a fuel cut-off solenoid valve is provided on the cylinder body 4 at the rear end of the oil cut-off piston 6. The enclosed space formed by the front cover 3, the cylinder body 4 and the control piston 5 is the control cylinder, and the enclosed space formed by the cylinder body 4, the control piston 5 and the oil cut-off piston 6 is the cut-off cylinder. A connecting nut 2 is fixedly installed at one end of the oil cut-off piston 6 away from the front cover 3, and a pull ring 1 connected to the throttle of the fuel injection pump is hinged on the connecting nut 2. A spring 8 is fixedly installed on the side of the oil cut-off piston 6 close to the rear end cover 9, and an adjusting bolt 7 is assembled in the middle of the rear end cover 9. The adjusting bolt 7 controls the stroke of the oil cut-off piston 6 by screwing in the length.

[0028] The enclosed space formed by the front end cover 3, cylinder body 4 and control piston 5 in the fuel cut-off control cylinder is the control cylinder, and the enclosed space formed by the cylinder body 4, control piston 5 and fuel cut-off piston 6 is the cut-off cylinder. When the pressurized air enters the control cylinder, the pressurized air pushes the control piston 5, thereby pushing the fuel cut-off piston 6, and the fuel cut-off piston 6 is connected to 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 limiting function. When the pressurized air enters the cut-off cylinder, the pressurized air pushes the fuel cut-off piston 6, and the fuel cut-off piston 6 drives the pull ring 1 to move, and finally the fuel injection pump is pulled to the parking position through the pull ring 1 to realize the fuel stop action.

[0029] The high-power diesel engine fuel cut-off control cylinder cleverly connects the fuel control cylinder and the fuel cut-off cylinder in series, realizing integrated control of fuel cut-off and control, eliminating the need to separately process the fuel control cylinder and the fuel cut-off cylinder, reducing processing difficulty and manufacturing costs.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A high-power diesel engine fuel cut-off control cylinder, It is characterized in that It comprises a cylinder body, a front end cover and a rear end cover respectively fixedly mounted at the front and rear ends of the cylinder body, an oil cut-off piston with a rear end tangent to the inner wall of the cylinder body is passed through the front end cover, a control piston is disposed on the outer sleeve of the oil cut-off piston to push the oil cut-off piston to move along the length direction of the cylinder body, a fuel control air inlet with a fuel control solenoid valve is provided on the cylinder body at the front end of the control piston, and a fuel cut-off air inlet with a fuel cut-off solenoid valve is provided on the cylinder body at the rear end of the oil cut-off piston, the enclosed space formed by the front end cover, the cylinder body and the control piston is the control cylinder, and the enclosed space formed by the cylinder body, the control piston and the oil cut-off piston is the cut-off cylinder; A spring is fixedly installed on one side of the oil cut-off piston close to the rear end cover, and an adjusting bolt is installed in the middle of the rear end cover. The adjusting bolt controls the stroke of the oil cut-off piston by screwing in the length; A connecting nut is fixedly mounted on one end of the oil cut-off piston away from the front end cover, and a pull ring connected to the throttle of the fuel injection pump is hinged on the connecting nut; The connecting nut is tightly matched with the oil cut-off piston; The front cover, the rear cover and the cylinder body are connected by bolt fasteners; Sealing rings are sleeved at the tangent positions of the control piston, the oil cut-off piston and the inner wall of the cylinder body.

2. The high-power diesel engine fuel cut-off control cylinder as claimed in claim 1, It is characterized in that An annular block tangent to the inner wall of the cylinder body is integrally formed and fixedly mounted in the middle of the control piston.

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