阅读说明：本技术 一种油嘴组件及高压燃油喷射阀 (Nozzle assembly and high-pressure fuel injection valve ) 是由 于建锋 王景致 徐小松 于 2021-08-17 设计创作，主要内容包括：本发明涉及燃油喷射技术领域,尤其涉及一种油嘴组件及高压燃油喷射阀。本发明采用的技术方案是：包括针阀体和针阀,所述针阀安装在所述针阀体内部的腔体中,所述针阀体的内部下端为密封锥形面,密封锥形面下端设有喷油孔,所述喷油孔与所述针阀组成密封喷射装置,针阀能够在所述腔体内部进行上下活动,所述针阀体与所述针阀之间形成油路,腔体内部设有高压腔,所述针阀的上设有节流扁,所述节流扁外侧的尺寸小于靠近所述针阀中心轴一侧位置的尺寸。本发明的优点是：能减缓阀密封件的开启速度并加快其关闭速度,改善喷射波形,使高压燃油喷射阀更容易满足排放要求,并与公开的节流结构,显著增加合格率,降低加工成本。(The invention relates to the technical field of fuel injection, in particular to a fuel nozzle assembly and a high-pressure fuel injection valve. The technical scheme adopted by the invention is as follows: including needle valve body and needle valve, the needle valve is installed in the inside cavity of needle valve body, the inside lower extreme of needle valve body is sealed conical surface, and sealed conical surface lower extreme is equipped with the nozzle opening, the nozzle opening with sealed injection apparatus is constituteed to the needle valve, and the needle valve can the cavity is inside to be gone on the activity from top to bottom, the needle valve body with form the oil circuit between the needle valve, the inside high-pressure chamber that is equipped with of cavity, it is flat to be equipped with the throttle on the needle valve, the size in the flat outside of throttle is less than and is close to the size of needle valve center pin one side position. The invention has the advantages that: the high-pressure fuel injection valve can slow down the opening speed of the valve sealing element, quicken the closing speed of the valve sealing element, improve injection waveform, enable the high-pressure fuel injection valve to meet the emission requirement more easily, and obviously increase the qualification rate and reduce the processing cost with the open throttling structure.)

1. The utility model provides a glib subassembly, includes needle valve body (1) and needle valve (2), needle valve (2) are installed in cavity (4) inside needle valve body (1), the inside lower extreme of needle valve body (1) is sealed conical surface, sealed conical surface lower extreme is equipped with the nozzle opening, the nozzle opening with sealed injection apparatus is constituteed to needle valve (2), needle valve (2) can cavity (4) inside is gone on and is moved about, needle valve body (1) with form oil circuit (3) between needle valve (2), cavity (4) inside is equipped with high-pressure chamber (5), its characterized in that: the oil way is characterized in that a throttle flat (7) is arranged on the needle valve (2), the size of the outer side of the throttle flat (7) is smaller than the size of the position close to one side of the central shaft of the needle valve (2), and the length of the throttle flat (7) in the vertical direction is 1.2-2 times of the width of the oil way (3).

2. The nozzle assembly of claim 1, wherein: the upper end of the needle valve body (1) is provided with an integral combined sealing installation groove.

3. The nozzle assembly of claim 1, wherein: the upper end of the needle valve body (1) is provided with a combined positioning matching boss.

4. A high-pressure fuel injection valve characterized by: a high pressure fuel valve body assembled with a nozzle assembly as claimed in claim 1.

5. The high pressure fuel injection valve according to claim 4, characterized in that: the oil nozzle assembly is fixedly connected with the oil nozzle fastening cap.

Technical Field

The invention relates to the technical field of fuel injection, in particular to a fuel nozzle assembly and a high-pressure fuel injection valve.

Background

In the world, the pollutant emission of a power assembly becomes the focus of international social attention, and with the strictness of emission regulations, an engine electronic control fuel injection system capable of realizing high-pressure accurate control injection becomes the only technical route of a diesel engine technology. In order to effectively control the emission of pollutants, the opening and closing of the injection process need to be accurately controlled, so that the injection waveform reaches a state of slow first and fast second, the injection process is beneficial to an engine to form more uniform combustible mixed gas, and the effects of reducing oil consumption, reducing the emission of pollutants and improving the running noise of the engine are achieved. Most of the existing high-pressure fuel injection valves adopt a non-throttling oil nozzle assembly, and the structure can not meet the requirements of smooth and slow opening and crisp closing, so that the emission quality is difficult to improve. The opening and closing of a valve sealing piece in the existing oil nozzle assembly cannot meet the requirements of smooth and slow opening and convenient and crisp closing.

Disclosure of Invention

The invention aims to provide a nozzle assembly and a high-pressure fuel injection valve, which adopt a brand-new structural design, can slow down the opening speed of a valve sealing member and accelerate the closing speed of the valve sealing member by arranging a specific throttling flat on the valve sealing member and forming a throttling device with a valve seat, improve injection waveform, enable the high-pressure fuel injection valve to meet the emission requirement more easily, and obviously increase the qualification rate and reduce the processing cost with an open throttling structure.

The technical scheme of the invention is as follows:

the utility model provides a glib subassembly, includes needle valve body and needle valve, the needle valve is installed in the inside cavity of needle valve body, the inside lower extreme of needle valve body is sealed conical surface, sealed conical surface lower extreme is equipped with the nozzle opening, the nozzle opening with sealed injection apparatus is constituteed to the needle valve, the needle valve can the cavity is inside to be gone on from top to bottom the activity, the needle valve body with form the oil circuit between the needle valve, the inside high-pressure chamber that is equipped with of cavity, its characterized in that: the needle valve is provided with a throttle flat, the size of the outer side of the throttle flat is smaller than the size of the position close to one side of the central shaft of the needle valve, and the length of the throttle flat in the vertical direction is 1.2-2 times of the width of the oil way.

Furthermore, the upper end of the needle valve body is provided with an integral combined sealing installation groove.

Furthermore, the upper end of the needle valve body is provided with a combined positioning matching boss.

A high-pressure fuel injection valve characterized by: a high pressure fuel valve body assembled with a nozzle assembly as claimed in claim 1.

Further, the oil nozzle assembly is fixedly connected with the oil nozzle fastening cap.

The invention has the beneficial effects that:

the invention adopts a brand new structural design, and the special throttling flat is arranged on the valve sealing element to form a throttling device with the valve seat, so that the opening speed of the valve sealing element can be slowed down, the closing speed of the valve sealing element can be accelerated, the injection waveform can be improved, the high-pressure fuel injection valve can meet the emission requirement more easily, and the qualification rate is obviously increased and the processing cost is reduced together with the disclosed throttling structure.

Drawings

FIG. 1 is a transverse cross-sectional schematic view of a prior art nozzle assembly;

FIG. 2 is a schematic cross-sectional view of a prior art nozzle assembly;

FIG. 3 is a schematic cross-sectional view of the present invention;

in the figure: 1. the needle valve body 2, the needle valve 3, the oil path 4, the cavity 5, the high pressure cavity 7 and the throttle flat.

Detailed Description

As shown in fig. 1 to 3, a nozzle assembly and a high-pressure fuel injection valve adopt a brand-new structural design, and a specific throttle flat is arranged on a valve sealing member to form a throttle device with a valve seat, so that the opening speed of the valve sealing member can be slowed down, the closing speed of the valve sealing member can be accelerated, the injection waveform is improved, the high-pressure fuel injection valve can meet the emission requirement more easily, and the high-pressure fuel injection valve and an open throttle structure obviously increase the qualification rate and reduce the processing cost. The needle valve comprises a needle valve body 1 and a needle valve 2, wherein the needle valve 2 is installed in a cavity 4 inside the needle valve body 1, the inner lower end of the needle valve body 1 is a sealing conical surface, an oil injection hole is formed in the lower end of the sealing conical surface, the oil injection hole and the needle valve 2 form a sealing injection device, the needle valve 2 can move up and down in the cavity 4, an oil circuit 3 is formed between the needle valve body 1 and the needle valve 2, a high-pressure cavity 5 is formed in the cavity 4, a throttle flat 7 is arranged on the needle valve 2, the size of the outer side of the throttle flat 7 is smaller than the size of one side position close to the central shaft of the needle valve 2, the length of the throttle flat 7 in the vertical direction is 1.2-2 times of the width of the oil circuit 3, the durability of the throttle flat 7 in use is guaranteed through the setting of the throttle flat 7, the length is more reasonable, and the sensitivity of the throttle flat height can be effectively reduced, and under the condition that the throttle areas of different sections in the length direction are not consistent, the processing difficulty is reduced, and the product percent of pass is increased. The outer side of the throttle flat 7 can be set into a circular arc structure, so that the throttle flat can be more smoothly matched when in use, and the service life of the throttle flat is longer in use.

Preferably, the upper end of the needle valve body 1 is provided with an integral combined sealing installation groove, so that the sealing stability during later assembly is guaranteed to be more reliable.

Preferably, the upper end of the needle valve body 1 is provided with a combined positioning matching boss, so that the precision is higher when the integral combined installation is carried out in the later period, and the assembly operation is more convenient.

A high-pressure fuel injection valve characterized by: the high-pressure fuel valve body is assembled with the nozzle assembly of claim 1, and can replace the traditional nozzle assembly to form a novel high-pressure fuel injection valve.

Preferably, the oil nozzle assembly is fixedly connected through the oil nozzle fastening cap, so that the installation operation is more convenient and the installation cost is lower during combined connection.

The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications or substitutions can be made without departing from the principle of the present invention, and these modifications or substitutions should also be considered as the protection scope of the present invention.