Low-noise fuel injector

Abstract

The invention relates to the technical field of oil sprayers, and discloses a low-noise oil sprayer which is characterized in that a noise reduction filling piece is arranged in a movement cavity between a first impact surface and a second impact surface in the oil sprayer, the noise reduction filling piece is filled in not less than 30% of an annular cavity of the movement cavity, the space of the cavity is reduced, and the circulation diameter of the movement cavity is reduced; the oil sprayer comprises a shell part, a moving part and a filtering part, wherein the moving part and the filtering part are arranged in the shell part. The filler used for noise reduction is additionally arranged in the movement cavity in an existing conventional fuel injector, so that a cavity in the fuel injector is reduced, noise suppression is carried out in an area generated by movement impact of a valve element, and the noise generated when the fuel injector operates can be effectively reduced under the condition that the structure of an original fuel injector is not affected; furthermore, a second noise reduction filling piece is additionally arranged in the extending cavity area of the oil injector, transmission of movement impact sound of the valve element is restrained, noise generated when the oil injector operates can be further reduced, and the oil injector operates more quietly.

Description

Technical Field

[0001] This invention relates to the field of fuel injector technology, and more particularly to a low-noise fuel injector. Background Technology

[0002] Conventional solenoid valve injectors typically generate significant noise during operation, impacting user experience. Their working principle is generally as follows: When an electrical signal is received, the injector coil becomes magnetic. Under the influence of magnetism and spring force, the valve core reciprocates inside the injector. During this movement, the valve core impacts a first impact surface A and a second impact surface B, producing sound. This impact sound is then transmitted to the outside of the injector through the cavity in the internal flow channel, thus creating noise.

[0003] A significant drawback of conventional fuel injectors in the current technology is their excessively large internal flow channel cavity area. This excessive cavity area allows a large amount of the impact noise generated by the valve core movement to be transmitted to the outside, resulting in excessive noise during fuel injector operation. This causes disturbance to operators in the working environment and affects their work experience.

[0004] Therefore, existing technology needs an improvement to effectively reduce the noise generated by solenoid valve injectors during operation. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] In view of the problems existing in the above-mentioned fuel injectors, the present invention is proposed.

[0007] Therefore, the purpose of this invention is to provide a low-noise fuel injector, which solves the problem of high noise in existing fuel injectors during operation.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a low-noise fuel injector, wherein a noise-reducing filler is provided in the moving chamber between the first impact surface and the second impact surface of the fuel injector, and the noise-reducing filler fills at least 30% of the annular cavity of the moving chamber, thereby reducing the cavity space and reducing the flow diameter of the moving chamber.

[0009] As a preferred embodiment of the low-noise fuel injector of the present invention, the fuel injector includes a housing component and a moving component and a filtering component disposed inside the housing component.

[0010] In a preferred embodiment of the low-noise injector of the present invention, the housing component includes a valve seat, a magnetic shielding sleeve, a main shaft tube, and a connecting pipe arranged coaxially. The valve seat is disposed inside the magnetic shielding sleeve, the magnetic shielding sleeve is fitted onto one end of the main shaft tube, and the connecting pipe is fitted onto the other end of the main shaft tube.

[0011] As a preferred embodiment of the low-noise injector of the present invention, the moving chamber is located in the cavity region between the valve seat and the main shaft tube within the magnetic shielding sleeve.

[0012] In a preferred embodiment of the low-noise fuel injector of the present invention, the moving component includes a valve core, a steel ball disposed at one end of the valve core, and an elastic element disposed at the other end of the valve core; the valve core and the steel ball are located in the moving chamber, and the axial length of the valve core and the steel ball is less than the axial length of the moving chamber.

[0013] In a preferred embodiment of the low-noise injector of the present invention, the valve core slides within the moving chamber, the steel ball is positioned at the nozzle of the valve seat, and the end of the elastic element away from the valve core is positioned within the main shaft tube; the steel ball contacts the wall of the valve seat to form the first impact surface; and the valve core contacts the end face of the main shaft tube to form the second impact surface.

[0014] In a preferred embodiment of the low-noise injector of the present invention, the noise-reducing filler is disposed in the flow channel region outside the valve core housing within the moving chamber; a flow gap is formed between the noise-reducing filler and the valve core housing.

[0015] In a preferred embodiment of the low-noise fuel injector of the present invention, the filter component is disposed inside the connecting pipe.

[0016] As a preferred embodiment of the low-noise injector of the present invention, it further includes a second noise-reducing filler, disposed at the output end of the filter component and in the cavity region within the connecting pipe.

[0017] In a preferred embodiment of the low-noise injector of the present invention, the second noise-reducing filler has a through hole in the middle, and the through hole is connected to the flow channel inside the injector.

[0018] The beneficial effects of this invention are: This invention reduces the internal cavity of the injector by adding a noise-reducing filler to the moving chamber within a conventional injector, thereby suppressing noise in the area where the valve core impacts. This effectively reduces the noise during injector operation without affecting the original injector structure. Furthermore, by adding a second noise-reducing filler in the extended cavity area of ​​the injector, the propagation of the valve core impact sound is suppressed, further reducing the noise during injector operation and making the injector quieter. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a schematic cross-sectional view of the low-noise fuel injector of the present invention. Figure 2 This is a cross-sectional plan view of the low-noise fuel injector of the present invention without noise-reducing filler. Figure 3 This is a cross-sectional plan view of the housing component of the low-noise fuel injector of the present invention; Figure 4 This is a cross-sectional planar structural diagram of the case in Embodiment 1 of the present invention where one noise reduction filler is provided; Figure 5 This is a cross-sectional planar structural diagram of the case in Embodiment 2 of the present invention where two noise reduction fillers are provided. Detailed Implementation

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0022] Example 1

[0023] Reference Figures 1-4In the first embodiment of the present invention, a low-noise fuel injector is provided. A noise-reducing filler 200 is disposed in the moving chamber Y between the first impact surface A and the second impact surface B within the fuel injector 100. The noise-reducing filler 200 fills at least 30% of the annular cavity of the moving chamber Y, reducing the cavity space and the flow diameter of the moving chamber Y. To reduce the operating noise of the existing fuel injector 100, a noise-reducing filler 200 is added to the cavity between the two impact surfaces of the moving component 102 within the fuel injector 100, i.e., between the noise sources, reducing the cavity space of the moving chamber Y. The purpose is to suppress the propagation of noise from the noise source without affecting the original function of the fuel injector 100, thereby reducing the overall noise level of the fuel injector 100.

[0024] The injector 100 includes a housing component 101 and a moving component 102 and a filter component 103 disposed inside the housing component 101. The housing component 101 is the main structural component of the injector 100, the moving component 102 is a movable component, and the injection medium is sprayed out by controlling its movement process; the filter component 103 is used to filter the injection medium to make it pure and meet the requirements for spraying out from the nozzle K.

[0025] Specifically, the housing component 101 includes a valve seat 101a, a magnetic shielding sleeve 101b, a spindle tube 101c, and a connecting tube 101d arranged coaxially. The valve seat 101a is disposed inside the magnetic shielding sleeve 101b, the magnetic shielding sleeve 101b is fitted onto one end of the spindle tube 101c, and the connecting tube 101d is fitted onto the other end of the spindle tube 101c.

[0026] The valve seat 101a, the magnetic shielding sleeve 101b, the main spindle tube 101c, and the connecting tube 101d are assembled together to form a tubular structure, and an accommodating cavity is formed inside the tubular structure. The moving chamber Y is the cavity area between the valve seat 101a and the main spindle tube 101c inside the magnetic shielding sleeve 101b. In addition to the moving chamber Y, the accommodating cavity also includes the tube areas of the main spindle tube 101c and the connecting tube 101d.

[0027] Furthermore, the moving part 102 is integrally disposed within the accommodating cavity, and its flow channel is connected to the accommodating cavities within the magnetic shielding sleeve 101b, the main shaft tube 101c, and the connecting tube 101d to form an inner flow channel L.

[0028] Specifically, the moving part 102 includes a valve core 102a, a steel ball 102b disposed at one end of the valve core 102a, and an elastic element 102c disposed at the other end of the valve core 102a; wherein, the valve core 102a and the steel ball 102b, as moving parts, are located in the moving chamber Y and operate under the driving action of the elastic element 102c and the electromagnetic coil outside the spindle tube 101c; therefore, the axial length of the valve core 102a and the steel ball 102b must be less than the axial length of the moving chamber Y.

[0029] In this design, the valve core 102a slides within the motion chamber Y; the steel ball 102b is positioned at the nozzle K of the valve seat 101a, and its position can be changed to block or release the nozzle K; the steel ball 102b contacts the wall of the valve seat 101a to form a first impact surface A; the valve core 102a contacts the end face of the spindle tube 101c to form a second impact surface B. One end of the elastic element 102c, away from the valve core 102a, is positioned within the spindle tube 101c, meaning the end of the elastic element 102c is fixed within the spindle tube 101c. Specifically, this can be achieved by a limiting tube 101d fitted inside the spindle tube 101c, where the elastic element 102c is preferably a spring structure.

[0030] It should be further noted that the noise reduction filler 200 is disposed in the flow channel area inside the motion chamber Y and outside the valve core 102a housing; a flow gap X is formed between the noise reduction filler 200 and the valve core 102a housing.

[0031] Preferably, the flow gap X is in the range of 0.3mm to 1mm. The noise reduction filler 200 is preferably made of nitrile rubber. In addition, the noise reduction filler 200 may also include filling methods of components made of any material, integrated parts, and methods such as reducing the inner diameter or increasing the thickness of the main body parts to achieve cavity reduction.

[0032] The filter element 103 is disposed inside the connecting pipe 101d, specifically at the opening of the connecting pipe 101d, to filter the injection medium entering the injector.

[0033] Reference Figure 4 In this embodiment, the noise reduction filler 200 is disposed in the flow channel area inside the motion chamber Y and outside the valve core 102a housing; this flow channel area is determined based on the external shape of the valve core 102a, and the external shape of the noise reduction filler 200 matches the shape of this flow channel area to fill this area; and after filling, the noise reduction filler 200 still has a flow gap X between itself and the valve core 102a housing to ensure the normal flow of the injection medium and its ejection from the nozzle K.

[0034] Preferably, the injection medium in this injector 100 can be gasoline, diesel anesthetic, urea, methanol, engine oil, natural gas, nitrogen, etc.

[0035] Example 2

[0036] Reference Figure 5In the second embodiment of the invention, based on the injector 100 in embodiment 1 above, the injector 100 further includes a second noise-reducing filler 300, which is disposed at the output end of the filter component 103 and in the cavity area within the connecting pipe 101d. This cavity area is the flow area of ​​the sprayed medium and also the propagation area of ​​the impact noise of the moving component 102. Therefore, the filler is disposed here to further reduce noise.

[0037] Furthermore, the second noise reduction filler 300 has a through hole T in the middle, which is connected to the flow channel inside the injector 100 to ensure the normal inflow and flow of the injection medium.

[0038] Preferably, the radial diameter of this through hole T is in the range of 0.5mm to 4mm.

[0039] Comparative Example

[0040] Based on the injector 100 in Example 1, when it is equipped with the noise reduction filler 200, its noise reduction effect is verified to be significantly improved.

[0041] Specifically, two sets of injectors 100, A and B, are configured with identical structures, materials, configurations, and parameters. In the injector 100 of set B, a noise-reducing filler 200, made of nitrile rubber, is installed in the motion chamber Y between the first impact surface A and the second impact surface B, filling 30% of the annular cavity of the motion chamber Y. When both sets of injectors 100 are started, the steel ball 102b and valve core 102a in the moving parts 102 reciprocate under the electromagnetic force generated by the coil and the action of the elastic element 102c, colliding with the first impact surface A and the second impact surface B.

[0042] Noise testing showed that the noise generated by injector 100 in group A was 65-68 dB, while the noise generated by injector 100 in group B was 58-62 dB, a reduction of more than 10%. This verifies that setting the noise-reducing filler 200 can indeed improve the operating noise of injector 100.

[0043] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A low noise fuel injector characterized by: A noise reduction filler (200) is arranged in a movement chamber (Y) between a first impact surface (A) and a second impact surface (B) in an oil injector (100), the noise reduction filler (200) fills an annular cavity of the movement chamber (Y) by not less than 30%, reduces the cavity space and reduces the flow diameter of the movement chamber (Y).

2. The low noise fuel injector of claim 1, wherein: The oil injector (100) comprises a shell part (101) and a movement part (102) and a filter part (103) arranged inside the shell part (101).

3. The low noise fuel injector of claim 2, wherein: The shell part (101) comprises a valve seat (101a), a magnetic isolation sleeve (101b), a main shaft tube (101c) and a connecting tube (101d) arranged coaxially, the valve seat (101a) is arranged in the magnetic isolation sleeve (101b), the magnetic isolation sleeve (101b) is sleeved on one end of the main shaft tube (101c), and the connecting tube (101d) is sleeved on the other end of the main shaft tube (101c).

4. The low noise fuel injector of claim 3, wherein: The movement chamber (Y) is located in the cavity region between the valve seat (101a) and the main shaft tube (101c) in the magnetic isolation sleeve (101b).

5. A low noise fuel injector according to claim 3 or 4, characterised in that: The movement part (102) comprises a valve core (102a), a steel ball (102b) arranged at one end of the valve core (102a), and an elastic member (102c) arranged at the other end of the valve core (102a). The valve core (102a) and the steel ball (102b) are located in the movement chamber (Y), and the axial length of the valve core (102a) and the steel ball (102b) is less than the axial length of the movement chamber (Y).

6. The low noise fuel injector of claim 5, wherein: The valve core (102a) slides in the movement chamber (Y), the steel ball (102b) is limited at the injection hole (K) of the valve seat (101a), and the end of the elastic member (102c) away from the valve core (102a) is limited in the main shaft tube (101c). The steel ball (102b) and the wall surface of the valve seat (101a) form the first impact surface (A); The valve core (102a) and the end surface of the main shaft tube (101c) form the second impact surface (B).

7. The low noise fuel injector of claim 6, wherein: The noise reduction filler (200) is arranged in the movement chamber (Y) and in the flow channel region outside the valve core (102a) shell; The noise reduction filler (200) and the valve core (102a) shell form a flow gap (X) therebetween.

8. A low noise fuel injector according to any one of claims 3, 4, 6 and 7, characterised in that: The filter part (103) is arranged in the connecting tube (101d).

9. A low noise fuel injector according to any one of claims 3, 4, 6 and 7, characterised in that: Further comprising, A second noise reduction filler (300) is arranged in the cavity region in the connecting tube (101d) at the output end of the filter part (103).

10. The low noise fuel injector of claim 9, wherein: The middle part of the second noise reduction filler (300) has a through hole (T), and the through hole (T) is communicated with the flow channel inside the oil injector (100).

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