CN220081570U - Novel oil sprayer capable of bearing high load - Google Patents

Abstract

The novel fuel injector capable of bearing high load is suitable for diesel engine, and is mechanical, its spring is not easy to deflect, and the additional load caused by ejector rod inertia force on the fuel injector spring and the fuel nozzle can be effectively reduced, so that the fuel injector can bear higher load, and can be used for diesel engine with high rotating speed and large fuel injection pressure so as to improve the performance and reliability of diesel engine.

Description

Novel oil sprayer capable of bearing high load

The utility model relates to a novel mechanical oil sprayer which is used for spraying fuel oil into a combustion chamber of a diesel engine and can bear higher load.

The utility model patent with the application number of CN03135773.3 and the name of an oil sprayer capable of bearing high load provides a novel oil sprayer which can reduce the load on a spring and a nozzle tip due to the inertia force of a mandril, thereby improving the bearing capacity of the oil sprayer. The oil sprayer comprises a tightening cap, an oil nozzle, a locating pin, an ejector rod, an oil sprayer shell, a spring, a pressure regulating screw plug, a cap, a gasket and a large locking nut, and is characterized in that: the device also comprises a screw rod and a small locking nut; the screw is screwed in through a screw hole positioned in the center of the pressure regulating screw plug, inserted into an inner hole of the spring and locked on the pressure regulating screw plug through a small locking nut so as to prevent loosening; when in a static state, the distance between the lower end of the screw rod and the upper end of the ejector rod is larger than the distance between the upper end of the valve core of the oil nozzle and the lower end of the shell of the oil sprayer; in the opening process of the oil sprayer, when the upward movement of the oil nozzle valve core is blocked at the lower end of the oil sprayer shell, the screw rod then blocks the ejector rod, so that the spring cannot be further compressed upwards under the action of inertia, the stress of the spring and the accumulated potential energy of the spring are reduced, and the impact load, generated on the oil nozzle valve core and the oil nozzle valve seat, of the downward movement inertia of the ejector rod when the oil sprayer is closed is reduced. However, in the scheme, the screw 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 is affected, the screw can slowly retreat after loosening, and is deflected left and right due to the existence of a thread clearance, so that the ejector rod deflects when collision occurs, the valve core of the oil nozzle and the valve seat of the oil nozzle are subjected to lateral force after falling, and the load bearing capacity of the oil injector is reduced. In addition, the small lock nut occupies space in the cap, so that the height of the cap is increased, and the longitudinal size of the fuel injector is increased.

The utility model aims to provide a novel oil sprayer capable of bearing high load, which can keep a spring on a central line of the oil sprayer, reduce load generated by the inertia force of a push rod on the spring and a nozzle tip, improve the bearing capacity and reliability of the oil sprayer, and stably and reliably replace a guide post acting by a screw in the prior art by inserting the spring in the middle of the spring without loosening and deflection, wherein the longitudinal dimension of the oil sprayer is smaller than that of the prior art.

The utility model relates to a fuel injector, which comprises a tightening cap, a fuel nozzle, a locating pin, a mandril, a fuel injector shell, a spring, a pressure regulating screw plug, a cap, a gasket and other parts of a conventional mechanical fuel injector, and is also provided with a guide post seat, wherein the upper section of the guide post seat is a spring upper seat, the lower section of the guide post seat is a cylindrical guide post which is connected with the spring upper seat into a whole to form a part, the central lines of the guide post seat and the spring upper seat are coincident, the upper section of the guide post seat is fixed at the lower part of the pressure regulating screw plug and cannot swing left and right and move upwards, the lower section of the guide post seat is inserted into a central inner hole of the spring, the lateral force generated by the left and right swing of the spring on the fuel nozzle is prevented, and the distance between the lower end of the guide post seat and the upper end of the mandril is larger than the lift of the fuel nozzle; in the opening process of the oil sprayer, after the upward movement of the oil nozzle valve core is blocked by the oil sprayer shell, the ejector rod can be blocked by the lower end of the guide post seat, and at the moment, the ejector rod can not further compress the spring under the action of 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 oil nozzle valve core and the oil nozzle valve seat when the oil sprayer is closed is reduced.

According to the technical scheme of the utility model, the novel oil sprayer disclosed by the utility model has the advantages that the guide post seat is used for replacing the functions of the screw rod and the small locking nut in the background technology, so that the original function can be realized, and the defect that the screw rod is easy to loosen and deviate and the longitudinal dimension is larger in the original scheme is overcome; because the rotation of the pressure regulating screw plug is not required to be prevented when the small locking nut is tightly combined, a large locking nut for locking the pressure regulating screw plug is omitted, the structure is simplified, and the cost is reduced; the elimination of the small lock nut allows the longitudinal dimension of the fuel injector to be reduced. The scheme of the utility model can stably and reliably keep the central line of the spring on the central line of the oil sprayer, and prevent the spring from swinging left and right to generate lateral force on the oil nozzle; the load formed by the ejector rod inertia force to the spring of the oil sprayer, the valve core of the oil nozzle and the sealing conical surface of the valve seat of the oil nozzle is reduced, so that the bearing capacity and the reliability of the novel oil sprayer are improved. As is well known, after the bearing capacity and the reliability of the fuel injector are improved, the fuel oil can be fully atomized by adopting higher injection pressure, so that 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 scheme related by the utility model can obviously improve the performance and the reliability of the diesel engine.

FIG. 1 is a schematic diagram of a novel fuel injector according to the present utility model, shown in a preferred embodiment;

FIG. 2 is a schematic illustration of another construction of a novel fuel injector according to the present utility model, shown in a second embodiment.

Detailed description of the preferred embodimentthe utility model is illustrated in figure 1 and is a preferred embodiment of the present utility model which includes not only the parts of a conventional mechanical fuel injector such as a tightening cap 1, a nipple 2, a locating pin 3, a plunger 4, a housing 5 for the fuel injector, a spring 6, a pressure regulating screw 8, a cap 9, a gasket 10, etc., but also a guide post base 7. The remaining numbers and letters etc. in fig. 1 are marked as follows: 2a is a valve core of the oil nozzle, and 2b is a valve seat of the oil nozzle; 7a is an oil return hole of the guide post seat, 7B is an upper section spring upper seat of the guide post seat 7, and 7C is a lower section guide post of the guide post seat 7; 8a is a pressure regulating screw plug oil return hole, and 8C is a cylindrical inner hole at the lower part of the pressure regulating screw plug; 9a is the upper space of the cap; 11 is a wear-resistant cushion block; a is the central line of the fuel injector; h is the distance from the oil nozzle valve core 2a to the oil injector shell 5 in a static state, namely the lift of the oil nozzle valve core 2 a; h is the distance between the guide post seat 7 and the ejector rod 4 in a static state, and H is more than H. The upper section of the guide post seat 7 is a spring upper seat 7B, the lower section is a cylindrical guide post 7C, and the central lines of the spring upper seat and the guide post seat are overlapped and connected into a whole to form a part. The upper section spring upper seat 7B of the guide post seat 7 is partially and completely positioned in the cylindrical inner hole 8C at the lower part of the pressure regulating screw plug 8, and the guide post seat 7 and the pressure regulating screw plug 8 are combined together, so that the guide post seat 7 cannot swing left and right and move upwards, the lower section guide post 7C of the guide post seat 7 is inserted into the center of the spring 6, the center line of the spring 6 is stably and reliably maintained on the center line A of the fuel injector, and the lateral force generated by the left and right swing of the spring 6 on the fuel nozzle 2 is prevented. In the opening process of the oil injector, after the oil nozzle valve core 2a walks upwards for all the lift ranges H, the ejector rod 4 can only move upwards for the distance of H-H, namely, the ejector rod 4 is propped against the lower end of the guide post seat 7, so that the distance for continuously compressing the spring 6 upwards and the potential energy accumulated by the spring 6 under the action of inertia of the ejector rod 4 can be effectively reduced, and the additional load on the spring 6, the oil nozzle valve core 2a and the oil nozzle valve seat 2b caused by the inertia of the ejector rod 4 when the oil injector is closed is reduced. The oil return hole 7a of the guide post seat on the center line of the guide post seat 7 is communicated with the oil return hole 8a of the pressure regulating screw plug 8, so that oil return is facilitated. The wear-resistant cushion block 11 subjected to heat treatment is arranged on the guide post seat 7 and is positioned between the guide post seat 7 and the spring 6 so as to increase wear resistance. In the solution of fig. 1, since the guide post seat 7 is located 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 solution of fig. 1 can be preferentially adopted when the diameter of the spring 6 is larger. The cap upper space 9a can also be relatively reduced to reduce the longitudinal dimension of the fuel injector, without the small lock nut of the background art.

Fig. 2 shows a second embodiment of the present utility model, which, like fig. 1, includes not only the parts of a conventional mechanical fuel injector such as a tight cap 1, a nozzle tip 2, a positioning pin 3, a push rod 4, a fuel injector housing 5, a spring 6, a pressure regulating screw 8, a cap 9, a gasket 10, etc., but also a guide post base 7. The names and meanings of the other marks such as the serial numbers and letters in fig. 2 are the same as those in fig. 1, and the newly added mark 7B in fig. 2 is the upper part of the spring upper seat 7B. As in fig. 1, the upper section of the guide post seat 7 in fig. 2 is a spring upper seat 7B, and the lower section is a cylindrical guide post 7C, and the center lines of the two are coincident and connected into a whole. The difference is mainly that the combination modes of the guide post seat 7 and the pressure regulating screw plug 8 are different, and only the upper end 7B of the upper section spring upper seat 7B of the guide post seat 7 is positioned in the cylindrical inner hole 8C at the lower part of the pressure regulating screw plug 8. In addition, the guide post seat oil return hole 7a is not designed in the center of the guide post seat 7 so as to adapt to the condition that the diameter of the spring 6 is smaller. Since the guide post holder is easy to heat treat at this time, the wear pad 11 of fig. 1 is omitted in this embodiment. In this embodiment, the lower end surface of the pressure regulating screw plug 8 may be machined, with the center of the pressure regulating screw plug 8 as the center, and through an annular oil groove of the pressure regulating screw plug oil return hole 8a, so as to communicate the pressure regulating screw plug oil return hole 8a with the guide post base oil return hole 7 a; or a positioning pin is additionally arranged between the pressure regulating screw plug 8 and the guide post seat 7 so that the pressure regulating screw plug and the guide post seat 7 cannot rotate relatively, thereby ensuring the communication between the pressure regulating screw plug oil return hole 8a and the guide post seat oil return hole 7 a.

When the guide post holder 7 and the pressure regulating screw plug 8 are combined together by processing the guide post holder 7 and the pressure regulating screw plug 8 on one blank in fig. 2, another embodiment of the utility model can be produced, at this time, the cylindrical inner hole 8C at the lower part of the pressure regulating screw plug 8 is not needed, and the wear-resistant cushion block 11 can be added between the guide post holder 7 and the spring 6 as in fig. 1 because the integrally processed part has a complex structure and is not easy to control heat treatment deformation. In summary, the principle of operation of the fuel injector is the same as that of fig. 1 of the preferred embodiment, regardless of the manner in which the guide post holder 7 and the pressure regulating screw 8 are combined.

Claims (3)

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

2. A novel fuel injector capable of bearing high load as recited in claim 1, wherein: the upper section spring upper seat (7B) of the guide post 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 post 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 novel fuel injector capable of bearing high load as recited in claim 1, wherein: a wear-resistant pad (11) subjected to heat treatment is mounted on the guide post base (7), and the wear-resistant pad (11) is positioned between the guide post base (7) and the spring (6) to increase wear resistance.