Fuel nozzle multi-point micro-friction damping device

Abstract

The application provides a fuel nozzle multi-point micro friction damping vibration reduction device, which comprises a damping spring, a damping holder, an oil collecting ring and a sleeve, the oil collecting ring is installed at one end of the sleeve, the damping holder is fixed on the outer wall surface of the sleeve, one end of the damping spring is fixed on the outer wall surface of the oil collecting ring, and the other end and the damping holder form a multi-point contact, when the oil collecting ring vibrates, the damping spring is driven to vibrate and slip in the damping holder. The application aims at the problems of nozzle rod core vibration and thermal mismatch, and can be used for damping vibration reduction of the fuel nozzle in limited space and high temperature working environment, can significantly reduce the dynamic stress of the nozzle rod core, and improve the high cycle fatigue life of the nozzle. On the other hand, the damping spring can inhibit the deformation incoordination of the nozzle rod core caused by thermal mismatch, reduce the static stress of the key part of the rod core, and improve the low cycle fatigue life of the fuel nozzle.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of damping and vibration reduction of fuel nozzles in aero-engine combustion chambers, and particularly relates to a multi-point micro-friction damping and vibration reduction device for fuel nozzles, which is suitable for fuel nozzles in limited space and high-temperature environments. BACKGROUND

[0002] In advanced combustion chamber designs, in order to achieve low pollution emission requirements, the fuel nozzle adopts a multi-oil path centrifugal nozzle with a lean combustion heat protection structure, and the design of the internal stem is highly complex. The manufacturability of the product has been achieved by using emerging additive manufacturing technology. Combustion oscillation is a prominent problem in lean low-emission combustion chambers, and the peak value of the acoustic pressure pulsation brought to the fuel nozzle can reach 100 kPa. When the fuel nozzle is working, it also needs to withstand the rotor vibration excitation transmitted by the casing and the pipeline vibration excitation transmitted by the fuel manifold. The stem inside the nozzle has high amplitude and large vibration stress, and the stem oil path becomes a high-cycle fatigue failure risk position. Once fatigue rupture occurs, it may cause serious fuel leakage, ablation of the nozzle, and direct harm to the safety of the engine.

[0003] In addition, in the working state of the engine, the outside of the fuel nozzle is directly exposed to high-temperature gas flow (> 900K), and the internal fuel pipeline needs to be controlled at a relatively low temperature (< 477K) to inhibit the coking of fuel in the pipeline and prevent the abnormal temperature distribution at the outlet, ignition failure, and other situations caused by clogging of the nozzle. However, the temperature load of internal cooling and external heating directly aggravates the deformation of the internal and external structures, the local area of the internal stem is less than 1mm in thickness, and the stress concentration phenomenon is obvious, which greatly reduces the low-cycle fatigue life.

[0004] The fuel nozzle is limited by the design structure of aerodynamics and heat protection, has small size and high integration, and works in a high-temperature environment (the shell temperature is > 900K), which brings great challenges to the damping and vibration reduction design in limited space. The conventional damper structure is large in size, and the working environment temperature is usually not high. The spring and other structures will lose elasticity at high temperatures, thereby losing damping effect, and it is difficult to apply to fuel nozzles with complex and precise structures.

[0005] When the fuel nozzle is working, on the one hand, it needs to withstand the rotor vibration excitation transmitted by the casing, the combustion pressure pulsation, and the pipeline vibration excitation transmitted by the fuel manifold. The vibration order of the internal stem of the nozzle is high, the amplitude is large, and it works in a high-temperature environment. The stem vibration is prone to high-cycle fatigue damage, which may cause fuel leakage and thus threaten the safety of the engine. On the other hand, the nozzle shell temperature is extremely high, the internal stem temperature is low, the thermal mismatch leads to high static stress of the stem, and the low-cycle fatigue life is low. The nozzle is processed by using the additive manufacturing process, the internal integration is high, the design space is limited, and the vibration reduction design and the reduction of thermal deformation are mismatched, which makes the design difficult.

[0006] Therefore, the fuel nozzle multi-point micro friction damping device is provided to overcome the above technical problems. SUMMARY

[0007] The present application aims to overcome the defects of the prior art in which it is difficult to provide an effective damping structure in the fuel nozzle of the combustion chamber in a limited space and high temperature environment, and provides a fuel nozzle multi-point micro friction damping device.

[0008] The present application solves the above technical problems by the following technical solutions:

[0009] A fuel nozzle multi-point micro friction damping device, characterized in that the fuel nozzle multi-point micro friction damping device comprises a damping spring, a damping holder, an oil collecting ring and a sleeve, the oil collecting ring is installed at one end of the sleeve, the damping holder is fixed on the outer wall surface of the sleeve, one end of the damping spring is fixed on the outer wall surface of the oil collecting ring, and the other end of the damping spring forms a multi-point contact with the damping holder, when the oil collecting ring vibrates, the damping spring vibrates and slips in the damping holder.

[0010] According to one embodiment of the present application, the other end of the damping spring is clamped in the damping holder.

[0011] According to one embodiment of the present application, the damping spring has a V-shaped structure, and the damping holder has a U-shaped structure.

[0012] According to one embodiment of the present application, the damping spring has a W-shaped structure, and the damping holder has a U-shaped structure.

[0013] According to one embodiment of the present application, the W-shaped structure of the damping spring is composed of a plurality of circular arc structures.

[0014] According to one embodiment of the present application, the other end of the damping spring abuts against the outer wall surface of the damping holder.

[0015] According to one embodiment of the present application, the damping holder has a ring-shaped structure, the outer wall surface of the damping holder has an inner recess, the other end of the damping spring has a protruding portion, and the protruding portion and the inner recess abut against each other.

[0016] According to one embodiment of the present application, the outer wall surface of the oil collecting ring is provided with an outwardly extending support portion, the oil collecting ring is connected with the sleeve through the support portion, and the damping spring is arranged on both sides of the support portion.

[0017] According to one embodiment of the present application, a plurality of limiting bosses are arranged on the oil collecting ring, a plurality of limiting holes are arranged on the damping spring sheet, the limiting holes are connected with the limiting bosses correspondingly, so that one end of the damping spring sheet is fixed on the oil collecting ring.

[0018] According to one embodiment of the present application, the fuel nozzle multi-point micro friction damping device further comprises an oil collecting ring shell and a nozzle shell, the oil collecting ring shell is installed outside the oil collecting ring and connected with the nozzle shell to form a containing cavity, the damping holder and the damping spring sheet are located in the containing cavity.

[0019] The positive progress effect of the present application is that:

[0020] The fuel nozzle multi-point micro friction damping device of the present application can be used for damping and vibration reduction of the fuel nozzle in limited space and high temperature working environment, can significantly reduce the dynamic stress of the nozzle rod core, and can improve the high cycle fatigue life of the nozzle. On the other hand, the damping spring sheet can inhibit the deformation of the nozzle rod core caused by thermal mismatch, reduce the static stress of the key part of the rod core, and improve the low cycle fatigue life of the fuel nozzle. In addition, the damping spring sheet anti-loosening structure is provided, which can prevent the spring sheet from falling off after the brazing part of the spring sheet and the oil collecting ring fails, and improve the working reliability of the damping spring sheet. BRIEF DESCRIPTION OF DRAWINGS

[0021] The above and other features, properties and advantages of the present application will become more apparent through the following description with reference to the accompanying drawings and embodiments, in which the same reference numerals always denote the same features, and wherein:

[0022] Figure 1 It is a schematic diagram of the arrangement space of the fuel nozzle multi-point micro friction damping device of the present application.

[0023] Figure 2 It is a schematic diagram of the structure of the fuel nozzle multi-point micro friction damping device of the present application.

[0024] Figure 3 It is a perspective view of embodiment one of the fuel nozzle multi-point micro friction damping device of the present application.

[0025] Figure 4 It is a front view of embodiment one of the fuel nozzle multi-point micro friction damping device of the present application.

[0026] Figure 5 It is a perspective view of embodiment two of the fuel nozzle multi-point micro friction damping device of the present application.

[0027] Figure 6 It is a front view of embodiment two of the fuel nozzle multi-point micro friction damping device of the present application.

[0028] Figure 7 Figure 3 is a perspective view of a third embodiment of the multi-point micro friction damping device for fuel nozzle of the present application.

[0029] Figure 8 Figure 4 is a front view of the third embodiment of the multi-point micro friction damping device for fuel nozzle of the present application.

[0030] Figure 9 Figure 5 is a schematic view of the anti-loosening structure of the damping spring of the multi-point micro friction damping device for fuel nozzle of the present application.

[0031] REFERENCE NUMERALS

[0032] Damping spring 10

[0033] Damping retainer 20

[0034] Oil collecting ring 30

[0035] Sleeve 40

[0036] Oil collecting ring housing 50

[0037] Nozzle housing 60

[0038] Accommodation cavity A

[0039] Supporting portion 31

[0040] Limiting boss 32

[0041] Limiting hole 11

[0042] Inner recess 21

[0043] Protruding portion 12

[0044] Small circular arc 13

[0045] Large circular arc 14

[0046] Dry friction area B

[0047] Retainer brazing area C

[0048] Spring brazing area D

[0049] Rod core 100 DETAILED DESCRIPTION

[0050] In order to make the above objectives, features and advantages of the present application more apparent, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0051] Embodiments of the invention will now be described in detail with reference to the accompanying drawings. Preferred embodiments of the invention will now be described in detail, examples of which are shown in the drawings. Wherever possible, the same reference numerals will be used in all the drawings to denote the same or similar parts.

[0052] Furthermore, although the terminology used in this invention is selected from commonly known and used terms, some terms mentioned in this specification may have been selected by the applicant in his or her judgment, and their detailed meanings are explained in the relevant sections of the description herein.

[0053] Furthermore, the invention should be understood not only through the actual terminology used, but also through the meaning implied by each term.

[0054] Example 1:

[0055] Figure 1 This is a schematic diagram of the spatial arrangement of the multi-point micro friction damping vibration reduction device for fuel nozzles according to the present invention. Figure 2 This is a schematic diagram of the multi-point micro friction damping vibration reduction device for fuel nozzles according to the present invention.

[0056] like Figure 1 and Figure 2 As shown, this embodiment discloses a multi-point micro friction damping vibration reduction device for fuel nozzles, which includes a damping spring 10, a damping seat 20, an oil collecting ring 30, and a sleeve 40. The oil collecting ring 30 is installed at one end of the sleeve 40, and there is an air insulation layer between the two. The damping seat 20 is fixed on the outer wall surface of the sleeve 40. One end of the damping spring 10 is fixed on the outer wall surface of the oil collecting ring 30, and the other end forms a multi-point contact (i.e., dry friction area B) with the damping seat 20. When the oil collecting ring 30 vibrates, it drives the damping spring 10 to vibrate and slide within the damping seat 20. Dry friction generates heat and dissipates the vibration energy of the rod core, reducing the dynamic stress of the rod core.

[0057] In addition, the fuel injector multi-point micro friction damping vibration reduction device also includes an oil collecting ring housing 50 and an injector housing 60. The oil collecting ring housing 50 is installed outside the oil collecting ring 30 and connected to the injector housing 60 to form a receiving cavity A (e.g., Figure 1 As shown, the damping seat 20 and the damping spring 10 are located in the receiving cavity A.

[0058] The radial distance between the nozzle shell 60 and the sleeve 40 is about 8mm, and the internal space of the fuel nozzle (i.e. the accommodation cavity A) is extremely narrow. The dangerous vibration order of the fuel nozzle is the local vibration mode of the internal rod core 100, the amplitude of the nozzle external structure such as the oil collecting ring shell 50, the nozzle shell 60 and the sleeve 40 is extremely small, the amplitude of the oil collecting ring 30 of the rod core 100 is large, the vibration energy is high, and there are multiple fuel flow paths inside the oil collecting ring 30. The oil collecting ring shell 50, the nozzle shell 60 and the sleeve 40 and other external structures of the nozzle are heated by the high-pressure compressor outlet airflow, and the temperature is higher than 900K during operation. The damping vibration reduction structure needs to withstand high-temperature working environment.

[0059] Preferably, the other end of the damping spring sheet 10 is clamped in the damping clamp seat 20. The damping spring sheet 10 is welded on the oil collecting ring 30 by brazing to form a spring sheet brazing area D, and the damping clamp seat 20 is welded on the sleeve 40 by brazing to form a clamp seat brazing area C.

[0060] Further, the support part 31 extending outward is arranged on the outer wall surface of the oil collecting ring 30, the oil collecting ring 30 is connected with the sleeve 40 through the support part 31, and the damping spring sheet 10 is arranged on both sides of the support part 31.

[0061] The multi-point micro-friction damping vibration reduction device of the fuel nozzle mainly plays the following two roles:

[0062] Firstly, when the oil collecting ring 30 vibrates, the damping spring sheet 10 vibrates, the damping spring sheet 10 axially and laterally vibrates and slips in the damping clamp seat 20, the multi-point micro-friction generates heat to dissipate the vibration energy of the rod core, reduces the vibration stress of the rod core, and the multi-point micro-friction area B is located in the inner side and outer side areas of the contact between the damping spring sheet 10 and the damping clamp seat 20 as shown in Figure 2 .

[0063] Secondly, the temperature of the nozzle shell 60, the oil collecting ring shell 50 and the sleeve 40 is extremely high, the temperature of the oil collecting ring 30 of the rod core 100 is low, the thermal mismatch causes the nozzle to deform uncoordinatedly, a large static stress is generated on the support part 31 and other parts of the oil collecting ring of the rod core, the damping spring sheet 10 suppresses the deformation of the rod core through the deformation of the spring sheet itself, a certain static stress is generated on the large circular arc area 14 of the damping spring sheet 10, thereby reducing the static stress of the support part 31 and other parts of the oil collecting ring 30 of the rod core 100, and improving the low-cycle fatigue life of the nozzle.

[0064] Figure 3 It is a perspective view of the embodiment one of the multi-point micro-friction damping vibration reduction device of the fuel nozzle of the present application. Figure 4 It is a front view of the embodiment one of the multi-point micro-friction damping vibration reduction device of the fuel nozzle of the present application.

[0065] As Figure 3 and Figure 4As shown, in this embodiment, the damping spring 10 is preferably V-shaped, and the damping seat 20 is preferably U-shaped. One side of the V-shaped damping spring 10 is brazed onto the oil collecting ring 30, and the other side is located inside the damping seat 20. The damping spring 10 and the damping seat 20 have multi-point micro-friction contact. The oil collecting ring 30 is connected to the sleeve 40 through the support part 31 of the oil collecting ring. The oil collecting ring 30 and the sleeve 40 have a radial air insulation layer structure with a small gap. When the nozzle rod core vibrates, the oil collecting ring 30 of the rod core 100 is the main vibration structure, and the sleeve 40 hardly vibrates.

[0066] When the rod core 100 vibrates, the damping spring 10 and the damping seat 20 undergo axial and lateral vibration and sliding. Multi-point micro-friction generates heat, consuming vibration energy and significantly reducing the rod core amplitude and dynamic stress. The V-shaped damping spring 10 has a shorter axial length, making it suitable for fuel nozzle structures with smaller dimensions or limited axial space. The V-shaped damping spring 10 directly transmits force during the vibration of the oil collecting ring 30, exhibiting significant vibration reduction and high static stress absorption after rod core deformation.

[0067] Figure 9 This is a schematic diagram of the anti-loosening structure of the damping spring in the multi-point micro friction damping vibration reduction device for fuel nozzles of the present invention.

[0068] like Figure 9 As shown, multiple limiting bosses 32 are provided on the oil collecting ring 30, and multiple limiting holes 11 are provided on the damping spring 10. The limiting holes 11 are connected to the limiting bosses 32 respectively, so that one end of the damping spring 10 is fixed on the oil collecting ring 30.

[0069] More specifically, the damping retainer 20 is first brazed onto the sleeve 40, and the damping spring 10 is pushed into the damping retainer 20 from the side as indicated by the arrow. An anti-loosening structure is designed in the welding area between the oil collecting ring 30 and the damping spring 10. Two circular limiting bosses 32 are designed on the oil collecting ring 30, and a circular limiting hole 11 is designed on the damping spring 10 to hold the spring within the bosses. The damping spring 10 is radially restricted by the oil collecting ring shell 50 and the oil collecting ring 30, preventing the damping spring 10 from falling out of the damping retainer 20 even if the brazed joint between the spring and the oil collecting ring fails, thus improving the reliability of the damping vibration reduction structure.

[0070] According to the above structural description, the fuel nozzle multi-point micro friction damping vibration reduction device adopts a nozzle multi-point micro friction damping vibration reduction structure, is suitable for a limited space and a super-high temperature environment, has simple structure and high working reliability. The limited space has an axial length of about 20 mm and a radial length of about 8 mm. The damping spring sheet 10 and the damping clamping seat 20 are made of a high-temperature alloy and can be used for a long time in a high-temperature working environment. The damping spring sheet 10 and the damping clamping seat 20 are connected with the nozzle body through brazing, need to enter a high-temperature brazing furnace, and the spring and other structures in a conventional damping lose elasticity and damping effect after being subjected to high temperature, but the micro damping structure of the present application does not have the above problems. During nozzle working, the diameter of the oil collecting ring 30 changes little due to low temperature, the sleeve 40 slightly expands and increases in diameter due to high temperature, so that the damping spring sheet 10 and the damping clamping seat 20 are pressed tightly, the multi-point micro friction area is well contacted, and the damping vibration reduction effect is remarkable.

[0071] Embodiment two

[0072] Figure 5 It is a perspective view of embodiment two of the fuel nozzle multi-point micro friction damping vibration reduction device. Figure 6 It is a front view of embodiment two of the fuel nozzle multi-point micro friction damping vibration reduction device.

[0073] As shown in Figure 5 and Figure 6 , in combination with Figure 1 and Figure 2 , the present embodiment is basically the same as embodiment one, and the difference lies in that the present embodiment discloses a fuel nozzle multi-point micro friction damping vibration reduction device, wherein the damping spring sheet 10 is preferably in W-shaped structure, and the damping clamping seat 20 is preferably in U-shaped structure. For example, the W-shaped structure of the damping spring sheet 10 is composed of a plurality of arc-shaped structures, preferably the structure combined with a small arc 13 and a large arc 14.

[0074] Compared with the V-shaped damping spring sheet 10, the W-shaped damping spring sheet 10 contains a large arc transition structure in the spring sheet configuration, which is beneficial to reduce the spring sheet static stress and improve the spring sheet low-cycle fatigue life. The W-shaped damping spring sheet 10 has a longer axial length and is suitable for a fuel nozzle structure with larger size or larger axial space.

[0075] The W-shaped damping spring sheet 10 has a damping effect and a spring sheet static stress balancing characteristic for absorbing rod core deformation due to the large arc structure buffer Figure 2 .

[0076] Embodiment three

[0077] Figure 7 It is a perspective view of embodiment three of the fuel nozzle multi-point micro friction damping vibration reduction device. Figure 8Figure 3 is a front view of a third embodiment of the multi-point micro-friction damping device for fuel nozzle of the present application.

[0078] As shown in Figure 7 and Figure 8 , in combination with Figure 1 and Figure 2 , the present embodiment is basically the same as the first embodiment, except that the present embodiment discloses a multi-point micro-friction damping device for fuel nozzle, wherein the other end of the damping spring 10 is attached to the outer wall of the damping retainer 20.

[0079] In the present embodiment, the damping retainer 20 is preferably in a ring shape, and the outer wall of the damping retainer 20 has an inner recess 21, and the other end of the damping spring 10 has a protrusion 12, which is attached to the inner recess 21. The damping spring 10 and the damping retainer 20 have a structure similar to H type.

[0080] The damping spring 10 is preferably in a horizontal structure, and the spring is designed in a variable cross-section, and is thickened in the multi-point micro-friction contact area between the damping spring 10 and the damping retainer 20. When the oil collecting ring 30 drives the damping spring 10 to vibrate, the inner side of the spring and the damping retainer 20 slide relative to each other, and the outer side of the spring and the nozzle shell 60 slide relative to each other, so as to generate heat through multi-point micro-friction, thereby dissipating the vibration energy of the rod core 100 and reducing the dynamic stress of the rod core 100. The damping spring 10 has the characteristics of general vibration damping and low static stress after absorbing the deformation of the rod core.

[0081] According to the above description of the first to third embodiments, the multi-point micro-friction damping device for fuel nozzle of the present application can be applied to fuel nozzles in limited space and high temperature working environment, and has the advantages of simple structure, high reliability and strong universality. The damping device can be selected according to the size of the fuel nozzle and the design requirements of the damping device. Through the vibration characteristics and high cycle fatigue test of the nozzle rod core, the dynamic stress of the above-mentioned rod core with damping structure is reduced by more than 50%, and the vibration level and high cycle fatigue life of the fuel nozzle are significantly improved.

[0082] Of course, the above-mentioned is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the present patent, a number of improvements and substitutions can be made, which all fall within the protection scope of the present application.

[0083] The multi-point micro-friction damping device for fuel nozzle of the present application is a multi-point micro-friction damping structure for fuel nozzle in combustion chamber suitable for limited space and high temperature environment, for example, including V type, W type and H type three nozzle rod core micro-friction damping structures. It mainly has the following characteristics:

[0084] I. A multi-point micro-friction damping structure of a fuel nozzle is provided, which comprises a damping spring and a damping seat. The damping spring is brazed to the oil collecting ring, and the damping seat is brazed to the sleeve. The damping structure can be used in the fuel nozzle with limited space and high temperature environment. When the rod core vibrates, the oil collecting ring drives the damping spring to vibrate and slip in the damping seat, and the multi-point micro-friction generates heat to dissipate the vibration energy of the rod core, thereby greatly reducing the amplitude and vibration stress of the nozzle rod core and improving the high-cycle fatigue life of the nozzle.

[0085] II. A multi-point micro-friction damping structure of a fuel nozzle is provided, which comprises a damping spring and a damping seat. The damping spring can suppress the deformation of the rod core caused by thermal mismatch, and the deformation of the spring can bear part of the static stress, thereby reducing the static stress of the key part of the rod core and improving the low-cycle fatigue life of the fuel nozzle.

[0086] III. A multi-point micro-friction damping structure of a fuel nozzle is provided, which comprises a damping spring and a damping seat. The damping structure can be used in the fuel nozzle with limited space and high temperature environment. When the rod core vibrates, the oil collecting ring drives the damping spring to vibrate and slip in the damping seat, and the multi-point micro-friction generates heat to dissipate the vibration energy of the rod core, thereby greatly reducing the amplitude and vibration stress of the nozzle rod core and improving the high-cycle fatigue life of the nozzle.

[0087] IV. A damping spring anti-loosening design structure is provided, which comprises a anti-loosening boss designed at the welding position of the damping spring and the oil collecting ring. Even if the welding between the damping spring and the oil collecting ring fails, the damping spring can still be prevented from loosening through the anti-loosening boss.

[0088] The main functions of the multi-point micro-friction damping device of the fuel nozzle include:

[0089] I. When the rod core in the nozzle vibrates, the damping spring welded to the oil collecting ring vibrates and slips in the damping seat, and the multi-point micro-friction generates heat to dissipate the vibration energy of the rod core, thereby reducing the vibration stress of the rod core and achieving the damping effect, and greatly improving the high-cycle fatigue life of the fuel nozzle.

[0090] II. The damping spring can suppress the deformation of the rod core, reduce the problem of thermal deformation mismatch caused by the cold inside and the hot outside of the nozzle, reduce the static stress of the key part of the rod core, and improve the low-cycle fatigue life of the fuel nozzle.

[0091] One aspect is to drive the damping spring vibration by the vibration of the oil collecting ring, and the vibration slip occurs in the damping seat, the multi-point micro friction generates heat to consume vibration energy, thereby reducing the amplitude and vibration stress of the rod core, greatly improving the high cycle fatigue life of the nozzle, and ensuring the safety of the engine. On the other hand, the damping spring can suppress the thermal mismatch deformation of the rod core, weaken the thermal deformation coordination mismatch problem caused by the cold inside and the hot outside of the nozzle, reduce the static stress of the key part of the rod core, and improve the low cycle fatigue life of the fuel nozzle.

[0092] In summary, the multi-point micro friction damping device of the fuel nozzle can be used for damping and vibration reduction of the fuel nozzle in limited space and high temperature working environment, can significantly reduce the amplitude and vibration stress of the nozzle rod core, and improve the high cycle fatigue life of the nozzle. On the other hand, the damping spring can suppress the deformation mismatch of the nozzle rod core caused by thermal mismatch, reduce the static stress of the key part of the rod core, and improve the low cycle fatigue life of the fuel nozzle. In addition, the damping spring anti-loosening structure is provided, which can prevent the spring from falling off after the brazing part of the spring and the oil collecting ring fails, and improve the working reliability of the damping spring.

[0093] Although the specific embodiments of the present application are described above, those skilled in the art should understand that these are only illustrative, the protection scope of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present application, and these changes and modifications all fall within the protection scope of the present application.

Claims

1. A fuel nozzle multi-point micro-frictional damping vibration reduction device, characterized in that, The fuel nozzle multi-point micro friction damping device comprises a damping spring, a damping holder, an oil collecting ring and a sleeve, the oil collecting ring is installed at one end of the sleeve, the damping holder is fixed on the outer wall surface of the sleeve, one end of the damping spring is fixed on the outer wall surface of the oil collecting ring, and the other end of the damping spring is in multi-point contact with the damping holder, when the oil collecting ring vibrates, the damping spring is driven to vibrate and slip in the damping holder, when the rod core is not matched in temperature, the damping spring restrains the deformation of the nozzle rod core caused by the temperature mismatch, and the damping spring bears part of the static stress to reduce the static stress of the rod core.

2. The fuel nozzle multi-point micro-tribo-damped vibration reduction device of claim 1, wherein, The other end of the damping spring is clamped in the damping holder.

3. The fuel nozzle multi-point micro-tribo-damped vibration damper device of claim 1, wherein, The damping spring has a V-shaped structure, and the damping holder has a U-shaped structure.

4. The fuel nozzle multi-point micro-tribo-damped vibration damper device of claim 1, wherein, The damping spring has a W-shaped structure, and the damping holder has a U-shaped structure.

5. The fuel injector multi-point micro-tribo-damper device of claim 4, wherein, The W-shaped structure of the damping spring is composed of a plurality of arc-shaped structures.

6. The fuel nozzle multi-point micro-tribo-damped vibration damper device of claim 1, wherein, The other end of the damping spring is attached to the outer wall surface of the damping holder.

7. The fuel injector multi-point micro-tribo-damper device of claim 6, wherein, The damping holder has a ring-shaped structure, the outer wall surface of the damping holder has an inner recess, the other end of the damping spring has a protruding portion, and the protruding portion is attached to the inner recess.

8. The fuel nozzle multi-point micro-tribo-damped vibration damper device of claim 1, wherein, The outer wall surface of the oil collecting ring is provided with an outwardly extending support portion, the oil collecting ring is connected to the sleeve through the support portion, and the damping spring is arranged on both sides of the support portion.

9. The fuel nozzle multi-point micro-tribo-damped vibration damper device of claim 1, wherein, The oil collecting ring is provided with a plurality of limiting bosses, the damping spring is provided with a plurality of limiting holes, the limiting holes are connected to the limiting bosses in correspondence, and one end of the damping spring is fixed on the oil collecting ring.

10. The fuel nozzle multi-point micro-tribo-damped vibration damper device of claim 1, wherein, The fuel nozzle multi-point micro friction damping device further comprises an oil collecting ring shell and a nozzle shell, the oil collecting ring shell is installed outside the oil collecting ring and connected to the nozzle shell to form a containing cavity, and the damping holder and the damping spring are located in the containing cavity.

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