Nozzle matching part of gas fuel injector
By designing annular sealing grooves and oil seepage grooves on the nozzle pair of the gas injector, high-pressure control oil forms an oil seal, the problem that traditional sealing methods cannot effectively prevent gas leakage under high-pressure conditions is solved, and a higher level of Safety and reliability.
Patent Information
- Application Number
- CN202421504911.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-28
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-06-28
AI Technical Summary
The traditional surface sealing method cannot effectively prevent gas leakage from the gas in the gas injector under high pressure conditions, which poses safety hazards and low working efficiency.
An optimized nozzle pair sealing surface structure is designed. By providing an annular sealing groove and an oil seepage groove on the outer needle valve body, high-pressure control oil is used to form an oil circuit seal to ensure the double seal of the gas injector.
It effectively prevents gas leakage, significantly improves the working safety and reliability of the injector, reduces maintenance costs, and provides guarantee for the stable operation of the internal combustion engine.
Smart Images
Figure CN222501931U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of gas fuel injectors, in particular to a nozzle pair of a gas fuel injector. Background Art
[0002] Injectors play an important role in various industrial applications, especially in fuel injection systems. Traditional liquid fuel injectors usually use a face seal between the nozzle pair and the body. This sealing method performs well under high pressure conditions and can effectively prevent the leakage of liquid fuel, thereby ensuring the stable operation and performance of the injector.
[0003] However, when this type of injector is used in gas injection scenarios, the reliability of the face sealing method may be challenged. Since gas has stronger permeability than liquid and is more susceptible to pressure changes, under high-pressure conditions, the traditional face sealing method may not be able to ensure the complete sealing of the gas injector, and there is a risk of gas leakage. This will not only reduce the working efficiency of the injector, but may also pose a threat to the working environment and operational safety.
[0004] The utility model aims to design an optimized nozzle pair sealing surface structure, aiming to fundamentally prevent the risk of gas leakage caused by poor sealing performance of the contact surface between the nozzle pair and the shell through innovative sealing design. This new design will not only improve the working efficiency and safety of the gas injector, but also promote the technological progress of related industrial applications. Utility Model Content
[0005] In view of the problems existing in the prior art, the utility model provides a nozzle pair sealing surface structure which is designed to optimize the design, and aims to fundamentally prevent the risk of gas leakage caused by poor sealing performance of the contact surface between the nozzle pair and the housing through innovative sealing design. This new design will not only improve the working efficiency and safety of the gas injector, but also promote the technological progress of related industrial applications.
[0006] The utility model is implemented as follows: a nozzle pair of a gas fuel injector includes a needle valve and an outer needle valve body, characterized in that: an annular sealing groove is provided on the sealing end surface of the gas fuel delivery inlet of the outer needle valve body; and an oil seepage groove is provided on the upper end surface of the outer needle valve body, which is connected to the annular sealing groove and the high-pressure oil control chamber containing the control oil.
[0007] Preferably, the oil pressure is controlled to be higher than the gas pressure, and the pressure difference is between 10 and 50 bar.
[0008] Preferably, the annular oil groove has a width of 0.3-0.6 mm and a depth of 0.5-1 mm.
[0009] Preferably, the oil seepage groove has a width of 0.8 to 1 mm and a depth of 0.5 to 1 mm.
[0010] Advantages and technical effects of the utility model: The application adopts the above technology to have the following advantages:
[0011] Double sealing protection: By machining a sealing groove on the end face of the outer needle valve body and using high-pressure diesel to control the oil to enter the sealing groove to form a circle of oil circuit seal, this oil-in-gas sealing form provides double insurance for the gas injector. This can not only effectively prevent gas leakage, but also greatly improve the safety and reliability of the injector's operation.
[0012] Efficient and safe: The control oil pressure is designed to be higher than the gas pressure, and the preferred pressure difference is 10 to 50 bar. This design can further ensure the performance reliability of the sealing surface, so that there is no gas leakage, ensuring the safe and reliable operation of the gas injector, and also ensuring the safe and reliable operation of the internal combustion engine.
[0013] Innovative structural design: By improving the sealing end face structure of the outer needle valve body and setting an oil seepage groove on the outer needle valve body, the high-pressure control oil can enter the sealing groove through the oil seepage groove, forming an effective oil circuit seal around the gas passage. This innovative structural design not only enhances the sealing effect, but also improves the service life and working efficiency of the nozzle pair.
[0014] Wide applicability: The utility model is not only suitable for the injection of gaseous fuels such as hydrogen, but can also be adjusted to adapt to other types of gaseous fuels according to actual needs, and has wide applicability.
[0015] Reduce maintenance costs: Due to the improvement of sealing performance, the possibility of gas leakage is reduced, thereby reducing the maintenance cost of the equipment and the potential safety risks caused by leakage.
[0016] In summary, the utility model significantly improves the safety and reliability of the gas fuel injector through the unique oil circuit sealing design and innovative nozzle pair structure, and provides a strong guarantee for the stable operation of the internal combustion engine. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the structure of the utility model;
[0018] Figure 2 yes Figure 1 A top view of
[0019] Figure 3 yes Figure 1 Middle partial enlarged picture;
[0020] Figure 4 It is a schematic diagram of the prior art structure.
[0021] In the figure, 1, needle valve; 2, outer needle valve body; 210, air inlet; 220, annular sealing groove; 230, high-pressure oil control chamber; 240, oil seepage groove. DETAILED DESCRIPTION
[0022] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail in combination with the embodiments below. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.
[0023] See also Figures 1 to 3 A nozzle pair of a gas fuel injector includes a needle valve 1 and an outer needle valve body 2, wherein an annular sealing groove 220 is provided on the sealing end surface of a gas fuel delivery inlet 210 on the outer needle valve body; an oil seepage groove 240 is provided on the upper end surface of the outer needle valve body, which is connected to a high-pressure oil control chamber 230 containing control oil through an annular sealing groove.
[0024] Preferably, the oil pressure is controlled to be higher than the gas pressure, and the pressure difference is between 10 and 50 bar.
[0025] Preferably, the annular oil groove has a width of 0.3-0.6 mm and a depth of 0.5-1 mm. Appropriate oil groove width (0.3-0.6 mm) and depth (0.5-1 mm) can ensure the stability and continuity of the oil film, which is crucial to maintaining sealing performance. An oil groove that is too wide or too deep may affect the uniformity and stability of the oil film.
[0026] Preferably, the width of the oil seepage groove is 0.8-1 mm and the depth is 0.5-1 mm, so as to achieve a balance between the control oil pressure and the gas pressure. This helps to prevent excessive oil pressure from damaging the sealing surface, while also ensuring that the sealing surface always has enough oil film to maintain the seal.
[0027] The utility model realizes the effective sealing of the gas fuel injector by the high-pressure control oil by cleverly designing the annular sealing groove and the oil seepage groove on the outer needle valve body. This double sealing structure not only significantly improves the sealing performance of the injector and effectively prevents gas leakage, but also greatly improves the safety and reliability of the injector operation, providing a solid guarantee for the stable operation of the internal combustion engine. At the same time, this innovative design also demonstrates the advancement and practicality of the utility model in the field of gas fuel injection technology.
[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A nozzle assembly of a gas fuel injector, comprising a needle valve and an outer needle valve body, characterized in that: An annular sealing groove is provided on the sealing end surface of the gas fuel delivery inlet of the outer needle valve body; and an oil seepage groove which is connected to the annular sealing groove and the high-pressure oil control chamber containing the control oil is provided on the upper end surface of the outer needle valve body.
2. The nozzle assembly of the gas fuel injector according to claim 1, characterized in that: The control oil pressure is higher than the gas pressure, and the pressure difference is between 10 and 50 bar.
3. The nozzle assembly of the gas fuel injector according to claim 1, characterized in that: The annular oil groove has a width of 0.3-0.6 mm and a depth of 0.5-1 mm.
4. The nozzle assembly of a gas fuel injector according to claim 1, characterized in that: The width of the oil seepage groove is 0.8-1 mm, and the depth is 0.5-1 mm.