Disclosure of Invention
The invention aims to provide a low-noise fuel injector special for a motorcycle, so as to overcome the defect of overlarge noise of the conventional fuel injector for the motorcycle in the working process.
In order to achieve the above object, the present invention provides a low noise fuel injector for motorcycles, comprising: a flow channel assembly comprising a sleeve; the electric drive assembly comprises an electromagnetic coil, and the electromagnetic coil is sleeved outside the sleeve; the sleeve shaft is sleeved in the sleeve pipe, and a shaft hole is formed in the sleeve shaft; the valve body assembly comprises a valve seat provided with a valve hole, the valve seat is sleeved in the sleeve, an armature is arranged between one end of the valve seat and the sleeve shaft, and an oil passing hole is formed in the armature; when the electromagnetic coil is electrified, the sleeve shaft and the armature can form an electromagnetic circuit, so that the armature is driven to move, and the valve hole is opened or closed; the annular column cavity is arranged between the valve seat and the sleeve, an annular groove is formed in the periphery of the valve seat, one end of the annular groove extends outwards from the other end of the valve seat, the annular column cavity is formed between the annular groove and the inner wall of the sleeve, and one end of the annular column cavity extends outwards from the other end of the valve seat; the metering sheet is arranged at the other end of the valve seat, and an atomizing hole is formed in the metering sheet; and the valve body assembly further comprises: the spring seat is sleeved in the shaft hole and penetrates through the spring seat to be provided with a spring seat hole; a spring disposed between the spring seat and the armature; the sealing steel ball is arranged between the armature and the valve seat, and the diameter of the sealing steel ball is matched with the diameters of the valve hole and the oil passing hole; the inner diameter of the annular column cavity is not more than 1.2 times of the diameter of the sealing steel ball, the outer diameter of the annular column cavity is not more than 3 times of the diameter of the sealing steel ball, the height of the annular column cavity is 0.5-1.5 times of the diameter of the sealing steel ball, and the thickness of the cavity of the annular column cavity is 0.1-0.5 times of the diameter of the sealing steel ball;
the noise reduction sheet is arranged between the other end of the valve seat and the metering sheet, a noise reduction sheet hole is formed in the middle of the noise reduction sheet, one end of the noise reduction sheet hole is communicated with the valve hole, the other end of the noise reduction sheet hole is communicated with the atomizing hole, 5-20 sound absorption teeth are uniformly arranged on the hole wall of the noise reduction sheet hole, and an area among the noise reduction sheet hole, the valve seat and the metering sheet forms an oblate cylindrical cavity; the diameter of the noise reduction sheet hole is 1-3 times of the diameter of the sealing steel ball; the thickness of the noise reduction sheet is 0.1-0.5 mm; and the angle of the tooth crest angle of the sound absorption tooth is 5-45 degrees.
Preferably, in the above technical solution, the flow channel assembly further includes: the sleeve is arranged in the shell, and two ends of the sleeve extend outwards from two ends of the shell respectively; the first sealing ring is sleeved outside one end of the sleeve; and the filter screen is sleeved in one end of the sleeve.
Preferably, in the above technical solution, the electric drive assembly further includes: the magnetic sleeve is arranged in the shell, one end of the magnetic sleeve is sleeved outside the electromagnetic coil, the other end of the magnetic sleeve is sleeved outside the other end of the sleeve, and the other end of the magnetic sleeve extends outwards from the other end of the shell; the electrode is arranged in the shell, one end of the electrode is connected with the electromagnetic coil, and the other end of the electrode extends outwards from the side surface of the shell; and the second sealing ring is sleeved outside the other end of the magnetic sleeve.
Compared with the prior art, the invention has the following beneficial effects:
1. the annular column cavity can absorb and isolate radial noise generated when the armature, the sealing steel ball and the valve seat collide with each other, and a certain noise reduction effect is achieved.
2. The oblate cylindrical cavity and the sound-absorbing teeth in the cavity can absorb noise transmitted to the metering sheet from the axial direction when parts in the valve body assembly collide, and radial noise decomposed at the position, so that a good noise reduction effect is achieved.
Drawings
FIG. 1 is a structural diagram of a low noise fuel injector for motorcycles according to the present invention.
Fig. 2 is a partial enlarged view of the present invention at the valve seat.
Fig. 3 is a schematic view of the process of absorbing axial sound waves by an oblate cylindrical cavity.
Fig. 4 is a schematic view of the structure of the noise reduction plate and the process of absorbing radial sound waves.
Description of the main reference numerals:
1-metering sheet, 101-atomizing hole;
2-noise reduction sheet, 21-noise reduction sheet hole;
3-valve seat, 31-valve hole;
4-a second sealing ring;
5-armature, 51-oil passing hole;
6-spring, 7-electromagnetic coil, 8-magnetic sleeve, 9-sleeve, 10-first sealing ring, 11-filter screen;
12-sleeve shaft, 121-shaft hole;
13-electrode, 14-housing, 15-annular column cavity;
16-oblate cylindrical cavity, 161-sound absorbing tooth;
17-spring seat, 171-spring seat bore;
18-sealing steel balls.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
As shown in fig. 1 to 3, the low noise fuel injector for motorcycles of this embodiment includes: the noise reduction device comprises a metering sheet 1, an atomization hole 101, a noise reduction sheet 2, a noise reduction sheet hole 21, a valve seat 3, a valve hole 31, a second sealing ring 4, an armature 5, an oil passing hole 51, a spring 6, an electromagnetic coil 7, a magnetic sleeve 8, a sleeve 9, a first sealing ring 10, a filter screen 11, a sleeve shaft 12, a shaft hole 121, an electrode 13, a shell 14, an annular cylindrical cavity 15, a flat cylindrical cavity 16, a sound absorption tooth 161, a spring seat 17, a spring seat hole 171 and a sealing steel ball 18.
The flow passage component mainly comprises a sleeve 9, a shell 14, a first sealing ring 10 and a filter screen 11; the sleeve 9 is fixed in the casing 14, two ends of the sleeve 9 respectively extend outwards from two ends of the casing 14, the first sealing ring 10 is sleeved on the outer wall of one end of the sleeve 9, and the filter screen 11 is sleeved in one end of the sleeve 9.
The electric drive assembly mainly comprises an electromagnetic coil 7, a magnetic sleeve 8, an electrode 13 and a second sealing ring 4; the electromagnetic coil 7 is sleeved outside the sleeve 9, the magnetic sleeve 8 is fixed in the shell 14, one end of the magnetic sleeve 8 is sleeved outside the electromagnetic coil 7, the other end of the magnetic sleeve 8 is sleeved outside the other end of the sleeve 9 and exceeds the end part of the other end of the sleeve 9, the other end of the magnetic sleeve 8 also extends outwards from the other end of the shell 14, and the magnetic sleeve 8 is made of soft magnetic stainless steel material; the electrode 13 is fixed in the shell 14, one end of the electrode 13 is connected with the electromagnetic coil 7, and the other end of the electrode 13 extends outwards from the side surface of the shell 14 to form a plug pin; the second seal ring 4 is sleeved outside the other end of the magnetic sleeve 8 and closely attached to the end face of the other end of the shell 14.
The sleeve shaft 12 is inserted in the sleeve 9, a shaft hole 121 is formed through the sleeve shaft 12, the shaft hole 121 extends outwards from two ends of the sleeve shaft 12, one end of the sleeve shaft 12 is located within the length range of the electromagnetic coil 7, and the sleeve shaft 12 is made of soft magnetic stainless steel.
The valve body component mainly comprises a valve seat 3, an armature 5, a spring seat 17, a spring 6 and a sealing steel ball 18; the valve seat 3 is sleeved in a port at one end of the sleeve 9, a valve hole 31 is formed in the middle of the valve seat 3, the valve hole 31 extends outwards from two ends of the valve seat 3, and the axis of the valve hole 31 and the axis of the sleeve 9 are overlapped; the armature 5 is arranged in the sleeve 9 in a manner of sliding along the axis of the sleeve 9, the armature 5 is positioned between one end of the valve seat 3 and the sleeve shaft 12, an oil passing hole 51 is formed through the inside of the armature 5, and two ends of the oil passing hole 51 extend outwards from two ends of the armature 5 respectively; the axis of the oil passing hole 51 and the axis of the valve hole 31 coincide with each other; a spring seat 17 is fixedly installed in the shaft hole 121, a spring seat hole 171 is formed through the middle of the spring seat 17, and two ends of the spring seat hole 171 extend outwards from two ends of the spring seat 17 respectively; a spring 6 is arranged between the spring seat 17 and the armature 5, a sealing steel ball 18 is arranged between the armature 5 and the valve seat 3, when the armature 5 is extruded by the spring 6, the sealing steel ball 18 can be tightly pressed on the valve seat 3, and the surface of the sealing steel ball 18 seals the valve hole 31 and the oil passing hole 51; when the electrode 13 is electrified for the electromagnetic coil 7, the sleeve 9, the sleeve shaft 12 and the armature 5 can form an electromagnetic loop, when the sleeve shaft 12 is magnetized, the armature 5 can be driven to slide along the axis of the sleeve 9 and attract the sleeve shaft 12, so that the valve hole 31 is opened, when the electromagnetic coil 7 is powered off, the armature 5 can be demagnetized rapidly due to the characteristics of the soft magnetic stainless steel material of the sleeve shaft 12, and then the armature 5 moves towards the valve seat 3 due to the restoring force of the spring 6, so that the valve hole 31 is closed instantly.
The metering sheet 1 is arranged in the other end of the magnetic sleeve 8, is opposite to the port of the other end of the sleeve 9, and is provided with a plurality of atomizing holes 101 through the metering sheet 1; a noise reduction sheet 2 is also arranged between the metering sheet 1 and the valve seat 3; a noise reduction sheet hole 21 is arranged in the middle of the noise reduction sheet 2 in a penetrating manner, one end of the noise reduction sheet hole 21 is communicated with the valve hole 31, one end of the noise reduction sheet hole 21 is communicated with the atomizing hole 101, and a plurality of sound absorption teeth 161 are uniformly arranged on the hole wall of the noise reduction sheet hole 21 in a circular array; the area enclosed by the noise reduction sheet hole 21, the valve seat 3 and the metering sheet 1 forms an oblate cylindrical cavity 16; the diameter of the noise reduction sheet hole 21 is 1-3 times of the diameter of the sealing steel ball 18, the thickness of the noise reduction sheet 2 is 0.1-0.5 mm, the number of the sound absorption teeth 161 is 5-20, and the angle of the tooth crest angle of each sound absorption tooth 161 is 5-45 degrees.
An annular groove 31 is formed in the periphery of the valve seat 3, one end of the annular groove 31 extends outwards from the other end of the valve seat 3, and an annular column cavity 15 is formed by an area defined by the annular groove 31 and the inner wall of the sleeve 9; the inner diameter of the annular column cavity 15 is not more than 1.2 times of the diameter of the sealing steel ball 18, the outer diameter of the annular column cavity 15 is not more than 3 times of the diameter of the sealing steel ball 18, the height of the annular column cavity 15 is 0.5-1.5 times of the diameter of the sealing steel ball 18, and the thickness of the cavity of the annular column cavity 15 is 0.1-0.5 times of the diameter of the sealing steel ball 18.
Next, the noise reduction process and principle in this embodiment will be further explained to make those skilled in the art understand the technical solution in this embodiment.
When the valve hole 31 in the valve body assembly is closed, the armature 5 continuously slides in the sleeve 9 under the action of the electromagnetic circuit, so that collision can be generated among the armature 5, the sealing steel ball 18 and the valve seat 3, noise is generated during the collision, sound waves of the noise can be transmitted to two directions, the sound waves in the first direction can be transmitted to the radial direction, and the sound waves in the second direction can be transmitted to the direction of the metering sheet 1 along the axial direction of the sleeve 9; when the sound wave in the first direction is transmitted to the annular column cavity 15, the transmission speed of the sound can be reduced due to the medium in the hollow junction of the column cavity, and the sound wave can be reflected back and forth between the walls of the annular column cavity 15, so that the effect of absorbing and weakening the sound wave in the first direction is achieved; as shown in fig. 3, the arrows in the figure indicate the transmission direction of the sound waves, the sound waves in the second direction are transmitted into the oblate cylindrical cavity 16, the sound waves transmitted in the axial direction are shielded and reflected by the metering sheet 1, as shown in fig. 4, the arrows in the figure indicate the transmission direction of the sound waves, the radial sound waves generated in the oblate cylindrical cavity 16 by the sound waves in the second direction impact on the tooth surfaces of the sound-absorbing teeth 161 and are reflected back and forth before the sound-absorbing teeth 161, and a part of the energy of the sound waves is consumed each time of reflection until the radial sound waves are completely absorbed and weakened, so that the noise reduction effect is achieved.
In summary, the invention reflects, weakens and absorbs the radial and axial noises generated by the components when the valve body assembly works through the structural design of the annular cylindrical cavity and the oblate cylindrical cavity inside the valve body assembly, thereby achieving good noise reduction effect.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.