CN114526183A

CN114526183A - Novel oil sprayer capable of bearing high load

Info

Publication number: CN114526183A
Application number: CN202210214989.0A
Authority: CN
Inventors: 金剑
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-03-07
Filing date: 2022-03-07
Publication date: 2022-05-24

Abstract

The utility model provides a can bear high-load novel sprayer, is applicable to the diesel engine, and for mechanical type, its spring is difficult for the skew, and the additional load that ejector pin inertial force arouses on sprayer spring and glib talker can effectively be reduced to can make the sprayer can bear higher load, can be used for the diesel engine that the rotational speed is high, fuel injection pressure is big, in order to improve the performance and the reliability of diesel engine.

Description

Novel oil sprayer capable of bearing high load

Technical Field

The invention relates to a novel mechanical fuel injector which is used for injecting fuel into a combustion chamber of a diesel engine and can bear higher load.

Background

The invention patent with application number CN03135773.3 named as 'an oil injector capable of bearing high load' provides a novel oil injector which can reduce the load generated on a spring and an oil nozzle by the inertia force of a mandril, thereby improving the bearing capacity of the oil injector. The oil sprayer is characterized by comprising a tight cap, an oil nozzle, a positioning pin, an ejector rod, an oil sprayer shell, a spring, a pressure regulating plug screw, a cap, a gasket and a large locking nut: it also comprises a screw and a small locking nut; the screw rod is screwed in from the screw hole located in the center of the pressure regulating screw plug, is inserted into the inner hole of the spring, and is locked on the pressure regulating screw plug by a small locking nut to prevent loosening; when the oil nozzle is in a static state, the distance between the lower end of the screw and the upper end of the ejector rod is larger than the distance between the upper end of the oil nozzle valve core and the lower end of the oil sprayer shell; in the process of opening the oil injector, when the valve core of the oil nozzle is blocked at the lower end of the oil injector shell in the upward movement process, the screw rod then blocks the ejector rod, so that the ejector rod cannot further compress the spring upwards under the action of inertia, the stress of the spring and the accumulated potential energy are reduced, and the impact load generated on the valve core of the oil nozzle and the valve seat of the oil nozzle by the inertia of the downward movement of the ejector rod when the oil injector is closed is reduced. However, in the scheme, the screw rod locked by the small locking nut is directly impacted by the inertia force of the ejector rod, so that the small locking nut is easy to loosen, the reliability of the locking screw rod is influenced, the screw rod slowly retreats after loosening, the ejector rod deflects when colliding due to the fact that the screw rod deflects left and right due to the existence of thread gaps, the nozzle valve core and the nozzle valve seat are subjected to lateral force after falling, and the load bearing capacity of the oil injector is reduced. In addition, the small locking nut occupies the space in the cap, so that the height of the cap is increased, and the longitudinal size of the fuel injector is increased.

Disclosure of Invention

The invention aims to provide a novel oil sprayer capable of bearing high load, which not only can keep a spring on the central line of the oil sprayer, reduce the load generated by the inertia force of an ejector rod on the spring and an oil nozzle and improve the bearing capacity and reliability of the oil sprayer, but also can be inserted into the middle of the spring to replace a guide post acted by a screw rod in the background technology to be stable and reliable without loosening and deflecting, and the longitudinal dimension of the oil sprayer is smaller than that of the background technology.

The invention relates to an oil sprayer which comprises parts of a tightening cap, an oil nozzle, a positioning pin, an ejector rod, an oil sprayer shell, a spring, a pressure regulating screw plug, a cap, a gasket and the like owned by a conventional mechanical oil sprayer, and is also provided with a guide column seat, wherein the upper section of the guide column seat is a spring upper seat, the lower section of the guide column seat is a cylindrical guide column and is connected with the spring upper seat into a whole to form a part, the central lines of the guide column seat and the spring upper seat are superposed, the upper section of the guide column seat is fixed at the lower part of the pressure regulating screw plug and cannot swing left and right and move upwards, the guide column part of the lower section of the guide column seat is inserted into a central inner hole of the spring to prevent the spring from swinging left and right to generate lateral force on the oil nozzle, and the distance from the lower end of the guide column seat to the upper end of the ejector rod is greater than the lift range of the oil nozzle; in the process of opening the oil injector, when the upward movement of the valve core of the oil nozzle is blocked by the shell of the oil injector, the ejector rod can be blocked by the lower end of the guide column seat, and the ejector rod cannot further compress the spring under the action of the inertia force, so that the potential energy accumulated by the spring can be reduced, the stress of the spring is reduced, and the impact load caused by the inertia force of the downward movement of the ejector rod on the valve core of the oil nozzle and the valve seat of the oil nozzle when the oil injector is closed is reduced.

According to the technical scheme, the novel oil sprayer replaces the functions of a screw and a small locking nut in the background technology by the guide column seat, not only can play the original role, but also overcomes the defects that the screw is easy to loosen and deflect and the longitudinal size is larger in the original scheme; the pressure regulating plug screw is not required to be prevented from rotating when the small locking nut is tightened, so that a large locking nut for locking the pressure regulating plug screw is omitted, the structure is simplified, and the cost is reduced; the elimination of the small locking nut allows the longitudinal dimension of the injector to be reduced. The scheme of the invention can stably and reliably keep the center line of the spring on the center line of the oil injector, and prevent the spring from swinging left and right to generate lateral force on the oil nozzle; the load formed by the inertia force of the ejector rod on the oil sprayer spring, the oil nozzle valve core and the oil nozzle valve seat sealing conical surface is reduced, and therefore the bearing capacity and reliability of the novel oil sprayer are improved. As is known, after the bearing capacity and reliability of the fuel injector are improved, the fuel can be fully atomized by adopting higher injection pressure, the combustion is improved to obviously improve the performance of the diesel engine, and meanwhile, the reliability of the fuel injector is closely related to the reliability of the diesel engine, so that the performance and the reliability of the diesel engine can be obviously improved by the scheme provided by the invention.

Drawings

Fig. 1 is a schematic structural diagram of a novel fuel injector related to the invention. The device comprises a tightening cap 1, a nozzle 2, a nozzle valve core 2a, a nozzle valve seat 2B, a positioning pin 3, an ejector rod 4, an oil sprayer shell 5, a spring 6, a guide column seat 7, a guide column seat oil return hole 7a, an upper spring seat 7B of the guide column seat 7, a lower guide column 7C of the guide column seat 7, a pressure regulating screw plug 8, a pressure regulating screw plug oil return hole 8A, a cylindrical inner hole at the lower part of the pressure regulating screw plug 8C, a cap 9, a cap upper space 9a, a gasket 10, a wear-resistant cushion block 11, an oil sprayer A, a central line oil, H, a distance between the nozzle valve core 2a and the oil sprayer shell 5 in a static state, namely a lift range of the nozzle valve core 2a, and the distance between the guide column seat 7 and the ejector rod 4 in a static state, wherein H is more than H.

Fig. 2 is another schematic structural diagram of the novel fuel injector related to the present invention, the principle and the names and meanings of the serial numbers and letters on the novel fuel injector are the same as those in fig. 1, and the difference is that only the upper part 7B of the upper spring seat 7B of the guide column seat 7 is partially positioned in the cylindrical inner hole 8C at the lower part of the pressure regulating screw plug 8, the center of the guide column seat is not provided with a guide column seat oil return hole 8a, and in addition, fig. 2 is also not provided with a wear-resistant cushion block 11.

Detailed Description

Fig. 1 is a preferred embodiment of the present invention, the principle of which is as follows: the upper spring seat 7B of the guide column seat 7 is partially and completely positioned in a cylindrical inner hole 8C at the lower part of the pressure regulating screw plug 8, the guide column seat 7 is combined with the pressure regulating screw plug 8 together, so that the guide column seat 7 cannot swing left and right and move upwards, and the lower guide column 7C of the guide column seat 7 is inserted into the center of the spring 6, so that the center line of the spring 6 is stably and reliably kept on the center line A of the fuel injector, and the side force generated by the left and right swinging of the spring 6 on the fuel nozzle 2 is prevented. In the process of opening the oil injector, after the nozzle tip valve core 2a moves upwards to complete the whole lift range H, the ejector rod 4 can only move upwards for a distance H-H, namely, the ejector rod is propped against the lower end of the guide column seat 7, so that the distance for the ejector rod 4 to continuously compress the spring 6 upwards under the action of inertia and the potential energy accumulated by the spring 6 can be effectively reduced, and the additional load caused on the spring 6, the nozzle tip valve core 2a and the nozzle tip valve seat 2b by the inertia of the ejector rod 4 when the oil injector is closed is reduced. The oil return hole 7a of the guide column seat on the center line of the guide column seat 7 is communicated with the oil return hole 8a of the pressure regulating plug screw 8 so as to facilitate oil return. A wear pad 11 that has been heat treated is mounted on the guide post holder 7 between the guide post holder 7 and the spring 6 to increase wear resistance. In the scheme of the figure 1, because the guide column seat 7 is positioned in a plurality of parts in the cylindrical inner hole 8C at the lower part of the pressure regulating screw plug, the longitudinal size of the whole fuel injector can be effectively reduced, and the scheme of the figure 1 can be preferentially adopted when the diameter of the spring 6 is larger. Without the small locking nut of the background art, the cap upper space 9a can also be relatively reduced to reduce the longitudinal dimension of the injector.

Fig. 2 is a second embodiment of the invention, which operates in the same manner as fig. 1. The difference mainly lies in that the combination mode of the guide column seat 7 and the pressure regulating screw plug is different, and only the part of the upper end 7B of the upper section spring upper seat 7B of the guide column seat 7 is positioned in the cylindrical inner hole 8C at the lower part of the pressure regulating screw plug 8. In addition, the center of the guide post seat is not provided with a guide post seat oil return hole 7a so as to adapt to the condition that the diameter of the spring 6 is smaller. Therefore, the guide post seat is easy to heat treat, so the wear-resistant cushion block 11 shown in figure 1 is omitted in the embodiment. In this embodiment, the lower end surface of the pressure regulating plug screw 8 is processed, and the annular oil groove which takes the center of the pressure regulating plug screw 8 as the center and passes through the pressure regulating plug screw oil return hole 8a is adopted to communicate the pressure regulating plug screw oil return hole 8a with the guide column seat oil return hole 7 a; or a positioning pin is additionally arranged between the pressure regulating plug screw 8 and the guide column seat 7 to prevent the two from rotating relatively, so that the communication between the pressure regulating plug screw oil return hole 8a and the guide column seat oil return hole 7a is ensured.

When the guide column seat 7 and the pressure regulating screw plug 8 are combined together in a mode of processing the guide column seat 7 and the pressure regulating screw plug 8 on a blank in the figure 2, another embodiment of the invention can be produced, and at the moment, a cylindrical inner hole 8C for assembling at the lower part of the pressure regulating screw plug 8 is not provided, and because the integrally processed part has a complex structure and is not easy to control heat treatment deformation, a wear-resistant cushion block 11 can be added between the guide column seat 7 and the spring 6 as in the figure 1. In summary, the working principle of the injector is the same as that of the preferred embodiment shown in fig. 1, no matter how the pilot cylinder seat 7 and the pressure regulating screw plug 8 are combined together.

Claims

1. The utility model provides a can bear high load's novel sprayer, includes tight cap 1, glib 2, locating pin 3, ejector pin 4, sprayer casing 5, spring 6, pressure regulating plug screw 8, block 9, gasket 10, characterized by: the oil nozzle comprises a nozzle body, a nozzle core valve core 2a, a pressure regulating screw plug 8, a guide column seat 7, a lower guide column 7C, a spring 6, a lower guide column 7, a lower guide column seat and a pressure regulating screw plug 8, wherein the guide column seat 7 is combined with the pressure regulating screw plug 8, so that the guide column seat 7 cannot swing left and right and move upwards, the center line of the spring 6 is stably and reliably kept on the center line A of the oil nozzle, the side force generated by the left and right swing of the spring 6 on the oil nozzle 2 is prevented, and the distance H between the lower end of the guide column seat 7 and the upper end of a push rod 4 is larger than the distance H between the upper end of the oil nozzle core valve core 2a and the lower end of the oil nozzle shell 5; in the process of opening the oil injector, after the upward movement of the nozzle tip valve core 2a is blocked at the lower end of the oil injector shell 5, the guide column seat 7 can then block the ejector rod 4, so that the ejector rod cannot further compress the spring 6 upwards under the action of inertia, the stress of the spring 6 and the accumulated potential energy thereof can be reduced, and the impact load caused by the downward movement inertia of the ejector rod 4 on the nozzle tip valve core 2a and the nozzle tip valve seat 2b when the oil injector is closed is reduced.

2. A new fuel injector capable of withstanding high loads as claimed in claim 1, characterized by: an upper spring seat 7B at the upper section of the guide column seat 7 is positioned in a cylindrical inner hole 8C at the lower part of the pressure regulating screw plug 8, so that the guide column seat 7 and the pressure regulating screw plug 8 are combined together and cannot swing left and right and move upwards; the center of the guide post seat 7 is provided with a guide post seat oil return hole 7 a.

3. A new fuel injector capable of withstanding high loads as claimed in claim 1, characterized by: a wear pad 11 that has been heat treated is mounted on the guide post holder 7, the wear pad 11 being located between the guide post holder 7 and the spring 6 to increase wear resistance.