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CN-224228772-U - Needle-free valve pre-pressing spring diesel oil injector

CN224228772UCN 224228772 UCN224228772 UCN 224228772UCN-224228772-U

Abstract

The utility model relates to the technical field of diesel oil injectors, in particular to a needle-free valve pre-pressing spring diesel oil injector which comprises a diesel oil injector main body and an oil inlet pipe joint arranged on the diesel oil injector main body, wherein an oil duct is arranged in the oil inlet pipe joint, an inner limiting ring is fixedly arranged on the cavity wall of the rear end part of the oil duct, the inner limiting ring is of an annular structure, an inner filter element cylinder is inserted and matched in the oil duct, an oil liquid channel arranged along the length direction of the inner filter element cylinder is arranged in the inner filter element cylinder, a central mesh reinforcing cylinder is fixedly arranged on the inner wall of the oil liquid channel, oil liquid filter screens are fixedly arranged on two end surfaces of the central mesh reinforcing cylinder, and the central mesh reinforcing cylinder and the oil liquid filter screens are all wavy. The utility model is provided with the filtering structure, is convenient for replacement operation, and achieves the effects of protecting the engine and prolonging the service life of the engine.

Inventors

  • Tu di
  • TU SIKANG
  • TU YUBIN

Assignees

  • 南阳市腾驰柴业机械有限公司

Dates

Publication Date
20260512
Application Date
20250613

Claims (8)

  1. 1. The needle-free valve pre-pressing spring diesel injector comprises a diesel injector main body (1) and an oil inlet pipe joint (10) arranged on the diesel injector main body (1), and is characterized in that an oil duct (11) is arranged in the oil inlet pipe joint (10), an inner limiting ring (12) is fixedly arranged on the cavity wall of the rear end part of the oil duct (11), the inner limiting ring (12) is of an annular structure, an inner filter element cylinder (2) is inserted and matched in the oil duct (11), an oil channel (20) arranged along the length direction of the inner filter element cylinder (2) is arranged in the inner filter element cylinder (2), a central mesh reinforcing cylinder (21) is fixedly arranged on the inner wall of the oil channel (20), and oil filter screens (22) are fixedly arranged on two end faces of the central mesh reinforcing cylinder (21).
  2. 2. The needle-free valve preloading spring diesel injector as set forth in claim 1, characterized in that a liquid through hole (121) communicated with the oil duct (11) is arranged at the center position of the inner limiting ring (12), and the liquid through hole (121) is arranged along the length direction of the oil duct (11).
  3. 3. The needle-free valve preloading spring diesel injector of claim 2, characterized in that the liquid through hole (121) is in a truncated cone shape, and the inner diameter of the liquid through hole (121) is sequentially increased from left to right.
  4. 4. The needle-free valve pre-pressing spring diesel injector according to claim 1, characterized in that the inner filter core barrel (2) is propped against the front side surface of the inner limiting ring (12), and the central mesh reinforcing barrel (21) is of a mesh-shaped structure.
  5. 5. The needle-free valve preloading spring diesel injector as set forth in claim 1, characterized in that the central mesh reinforcement cylinder (21) and the oil filter screen (22) are both wavy, and the end of the oil filter screen (22) is fixedly mounted on the inner wall of the oil channel (20) at the same time.
  6. 6. The needle-free valve preloading spring diesel injector is characterized in that a front flaring chamber (13) is arranged at the front side opening part of the oil duct (11), and an outer flaring chamber (14) is arranged on the front side chamber wall of the front flaring chamber (13).
  7. 7. The needle-valve-free pre-compression spring diesel injector of claim 6, wherein the front end barrel of the inner filter element barrel (2) is located at the front flaring cavity (13), and the length of the inner filter element barrel (2) located in the front flaring cavity (13) is 0.6 cm-1.3 cm.
  8. 8. The needle-free valve preloading spring diesel injector as claimed in claim 7, characterized in that an end anti-slip layer (23) is arranged on the surface of the inner filter element cylinder (2) in the front flaring chamber (13), and the end anti-slip layer (23) is of an anti-slip particle structure.

Description

Needle-free valve pre-pressing spring diesel oil injector Technical Field The utility model relates to the technical field of diesel oil injectors, in particular to a needle-free valve pre-pressing spring diesel oil injector. Background In the working process of a diesel engine, an oil injector is used as a core component of a fuel injection system, the performance of the oil injector plays a decisive role in the dynamic property, economy and emission characteristics of the engine, a traditional diesel oil injector generally adopts a needle valve structure, fuel injection and cut-off are realized by opening and closing the needle valve, and when the needle valve works, the pressure of a pre-tightening spring is overcome through a complex hydraulic driving system, so that accurate opening and closing actions are realized. However, such conventional needle valve injectors have a number of problems. Firstly, the long-term high-frequency impact and friction between the needle valve and the valve seat are easy to cause abrasion, the tightness and the service life of the fuel injector are affected, further, the fuel injection quantity is deviated, the combustion efficiency of the engine is reduced, secondly, the opening and closing response speed of the needle valve is limited, the requirements of a modern diesel engine on quick and accurate fuel injection control are difficult to meet, particularly when the working condition of the engine is frequently changed, the fuel injection time and the fuel injection quantity cannot be timely adjusted, the combustion is insufficient, and the fuel consumption and the pollutant emission are increased. In order to avoid the problems, the invention patent with the authority of CN109098907A discloses a diesel injector without a needle valve pre-pressing spring, which is characterized in that a valve seat of a control valve of the diesel injector adopts a long hole T-shaped column structure, liquid controls the tail hydraulic pressure of a needle valve through a long hole of the valve seat of the control valve, a T-shaped pilot valve seat adopts a floating installation structure, wherein the large end of the valve seat of the T-shaped control valve is downwards assembled in a central hole of an injector body in a sliding manner, the large end of the valve seat of the T-shaped control valve and the central hole of the injector body are provided with sealing seat surfaces which are matched with each other, the hydraulic pressure at the lower end of the valve seat of the T-shaped control valve enables the sealing surface of the valve seat of the T-shaped control valve to be pressed on the sealing surface of the injector body, the needle valve spring is not installed at the tail of the needle valve, the control valve spring also plays a role of the pre-pressing spring when an engine is stopped or just started, so that the needle valve is closed, and when the control valve is closed, the pressure at the tail pressure of the needle valve is higher than the front end of the needle valve, and the needle valve is closed by means of pressure difference. Although the technical scheme has the corresponding advantages, most of the existing needle-free valve preloading spring diesel oil injectors still have some defects when being specifically used, such as the fact that the corresponding filter assembly is lacking at the oil inlet pipe joint part of the existing needle-free valve preloading spring diesel oil injectors, the filter operation cannot be performed, impurities are easy to enter along with oil to influence the service life of a diesel engine, and the filter assembly is arranged in part of the oil inlet pipe joints, but is assembled in a complex installation mode, such as screw connection, and the like, so that the whole assembling and disassembling process is troublesome, and inconvenience is brought to replacing the filter assembly. In view of this, we propose a needle-free pre-loaded spring diesel injector. Disclosure of utility model The utility model aims to provide a needle-free valve pre-pressing spring diesel injector, which solves the defects in the prior art. In order to achieve the above purpose, the present utility model provides the following technical solutions: The needle-free valve pre-pressing spring diesel injector comprises a diesel injector main body and an oil inlet pipe joint arranged on the diesel injector main body, wherein an oil duct is arranged in the oil inlet pipe joint, an inner limiting ring is fixedly arranged on the cavity wall of the rear end part of the oil duct, the inner limiting ring is of an annular structure, an inner filter element cylinder is inserted and matched in the oil duct, an oil liquid channel arranged along the length direction of the inner filter element cylinder is arranged in the inner filter element cylinder, a central mesh reinforcing cylinder is fixedly arranged on the inner wall of the oil liquid channel, and oil liquid filt