WO2011143842A1

WO2011143842A1 - Solenoid valve for common rail injector

Info

Publication number: WO2011143842A1
Application number: PCT/CN2010/075123
Authority: WO
Inventors: 奥古斯丁·乌尔里克
Original assignee: 北京亚新科天纬油泵油嘴股份有限公司
Priority date: 2010-05-21
Filing date: 2010-07-13
Publication date: 2011-11-24
Also published as: CN102252124A; CN102252124B

Abstract

A solenoid valve for a common rail injector includes a valve body (60), a valve core (90) and an armature assembly including an armature (11) and a ball (9) engaged with the armature (11). The valve core (90) arranged in the chamber of the valve body (60) includes valve core magnetic poles (61, 62) and coils (57) wound on the corresponding positions of the valve core magnetic poles (61, 62). The armature (11) clearance-fitted with the valve core magnetic poles (61, 62) is connected to the valve body (60) at one side and is elastically connected to the valve body (60) at the other side so as to drive the armature (11) to move non-parallelly after the solenoid valve is powered off, so that the ball (90) is applied an eccentric torque so as to be biased on the valve seat. Because the armature moves non-parallelly and needs not be guided, the machining cost is saved.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a solenoid valve, and more particularly to a solenoid valve applied to a common rail injector. BACKGROUND OF THE INVENTION A high pressure common rail system utilizes a relatively large volume common rail cavity to accumulate high pressure fuel output from an oil pump, and eliminates pressure fluctuations in the fuel, and then supplies it to each injector, by controlling a solenoid valve on the injector. Achieve the start and end of the injection. In order to achieve fast response and generate large electromagnetic forces, the gap between the armature and the magnetic pole of the solenoid valve is small. The lift of the armature is also small, in the range of 50μπι. Standard solenoid valves in the prior art guide the armature in parallel to prevent any contact between the outer edge of the armature and the magnetic pole of the solenoid valve. Contact between the pole and the armature can cause damage to the contact surface of the part and residual magnetic forces can cause performance instability. However, parallel guide armatures require precise guiding dimensions and small tolerances. Therefore, parallel guide processing is expensive and sensitive to cleanliness and easy to wear.

SUMMARY OF THE INVENTION The present invention is directed to overcoming the above-mentioned deficiencies in the prior art by making the operation of the solenoid valve more stable by using an armature that is non-parallel and that does not require a guiding structure, and is relatively inexpensive to manufacture. The invention provides a solenoid valve for an injector, comprising a valve body, a valve core and an armature assembly, the armature assembly comprising an armature and a ball engaged with the armature, the valve core being located at the valve body Within the cavity, the spool includes a spool magnetic pole and a coil wound at a corresponding position of the spool magnetic pole, the armature being in clearance fit with the spool magnetic pole, wherein the armature is on a side offset from the center thereof The valve body is coupled, and is resiliently coupled to the valve body on the other side offset from the center thereof such that the armature generates a non-parallel movement after the solenoid valve is de-energized, thereby applying an eccentric torque to the ball to bias it against the valve seat on. Wherein, the radial positioning connection is specifically: the positioning hole on the armature side, positioning the direct selling or the ball pin and the valve body interference fit, positioning the direct selling or the ball pin extending out of the valve body portion is disposed in the positioning hole of the armature, positioning the direct selling Or the ball pin is in clearance with the armature positioning hole to allow the armature to move within a certain range. Wherein, on the other side of the armature, a spring is arranged between the armature and the valve body, and the spring has a certain offset with respect to the center of the valve seated by the ball. When the electromagnetic valve is de-energized, the spring force presses the armature against the ball, and generates an eccentric torque to the ball. The ball is sealed with the valve seat; after the solenoid valve is energized, the magnetic pole of the valve core attracts the armature, and the armature flips along the contact line with the valve body and compresses the spring, so that the ball is separated from the valve seat. Wherein, the armature is a flat structure, and the armature is provided with a vertically penetrating oil passage hole for providing a straight-through oil passage from one side to the other side during the movement of the armature; the upper surface of the armature is provided with an oil-sinking groove for smoothing the fuel Flowing into the oil hole and around the armature. The upper surface of the armature is also provided with a micro-sink, and the micro-sink is arranged perpendicular to the oil-sinking groove. The upper surface of the armature is also provided with a step for the armature limit. The spool may be U-shaped, including an outer magnetic pole and an inner magnetic pole, and the coil is wound around the inner magnetic pole; the valve core may also be in the shape of a pot, including an inner magnetic pole and an outer magnetic pole, and the coil is wound around the inner magnetic pole. Wherein, a guide ejector can be arranged between the armature and the sphere for transmitting the pressure exerted by the armature on the sphere; a non-guide ejector can be arranged between the armature and the sphere, and the non-guide ejector can slide on the back of the armature for use as The impact force is reduced when the armature moves to the seat or limit surface. Wherein, the ball is matched with the valve seat, and the contact surface between the ball and the valve seat is spherical or flat. The connection between the valve core and the valve body may be specifically as follows: a convex portion is arranged on both sides of the valve core, the valve core is fixedly connected to the valve body through a gasket, and the gasket is snap-fitted and fixed at the convex portion of the valve core. Wherein, the material of the valve core and the armature may be nickel-molybdenum-iron alloy. Wherein, the step of the armature limit position can also be fixedly arranged in the electromagnetic valve structure, and is located on the surface of the lower end surface of the electromagnetic valve and the armature, and the armature used with the armature is a flat plate structure, and the vertical through oil hole is arranged in the armature for When the armature transports work, it provides a straight-through oil passage from one side to the other side, and a positioning hole is arranged on one side of the armature for the radial positioning connection with the electromagnetic valve. Compared with the prior art, the armature in the solenoid valve of the present invention has non-parallel motion and does not need a guiding structure. By separating the springs on both sides and the positioning pin, torque can be generated to the ball and the armature and the solenoid valve body can be The stable contact avoids the disadvantages of the prior art parallel guide armature processing being expensive, sensitive to cleanliness and easy to wear. DRAWINGS Figure 1 is a cross-sectional view of the common rail injector driven by the solenoid valve of the present invention (showing the positional relationship between the injector and the solenoid valve and corresponding structural features);

Figure 2 is a cross-sectional view (U-shaped spool structure) of a first embodiment of the solenoid valve of the present invention; Figure 3 is a bottom view of the solenoid valve body of the first embodiment of the present invention (without an armature); Figure 4 is a solenoid valve of the present invention; 2 is a cross-sectional view of a solenoid valve body according to a second embodiment of the present invention (with no armature attached thereto); FIG. 6 is a top view of the solenoid valve armature of the present invention; 6 is a cross-sectional view orthogonal to the cross section of FIG. 7; FIG. 9 is a cross-sectional view of the third embodiment of the solenoid valve of the present invention (pot type spool structure); FIG. 10 is a bottom view of the pot type solenoid valve (not Figure 11 is a cross-sectional view showing a fourth embodiment of the solenoid valve of the present invention (showing another structure of the jack); Figure 12 is a cross-sectional view showing the fifth embodiment of the solenoid valve of the present invention (showing the ball and the valve) The contact surface of the seat is a plane);

Figure 13 is a schematic view showing the connection between the valve body and the valve core of the solenoid valve of the present invention;

Figure 14 is a bottom plan view showing the solenoid valve body of the present invention connected to the valve body. Figure 15 is a cross-sectional view showing a sixth embodiment of the solenoid valve of the present invention (another structure in which the armature limit step is disposed in the solenoid valve);

Figure 16 is a bottom view of the sixth embodiment of the solenoid valve (with no armature attached); Figure 17 is a bottom view of the rigid step of the armature of the sixth embodiment of the solenoid valve; Figure 18 is a side view of the rigid step of the armature of the sixth embodiment of the solenoid valve ( From the side of the solenoid valve spring

Figure 19 is a plan view of the armature used in conjunction with the sixth embodiment of the solenoid valve; the following reference numerals are marked thereon in conjunction with the drawings: 1-injector, 2-high pressure inlet fitting, 3-slot filter, 4-oil passage, 5-injector chamber, 7-plane, 8-cone seat, 9-ball, 1 1-arm , 13-needle valve spring, 14- solenoid valve spring, 16- control valve sleeve, 17-control plunger, 18-needle valve, 28-needle seat surface, 29-nozzle, 40-oil, 48-in Oil orifice, 55-control chamber, 56-oil outlet orifice, 57-solenoid coil, 59-solenoid valve cavity, 60- solenoid valve body, 61-external pole, 62-internal pole, 63- Guide ejector, 63 ' - non-guided ram, 64-contact line, 65-positioning pin, 70-valve body cavity, 71- solenoid spring mounting hole, 80-positioning pin hole, 81-over-oil hole, 83- Over oil tank, 84-mini sinker, 85-step, 90-U spool, 90 '-pot spool, 91- washer, 92-protrusion, 93-spool top, 94-screw, 100-rigid metal sheet, 101 - armature flip step, 102-armature limit step, 103-朔 seal process hole. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A specific embodiment of the present invention will be described in detail below with reference to the accompanying drawings, but it is understood that the scope of the present invention is not limited by the specific embodiments. Firstly, the structural characteristics and working process of the injector are introduced. As shown in Fig. 1, the high-pressure oil inlet joint 2 of the injector 1 is connected through a tubing (not shown) and a common rail (not shown). The high pressure oil flows from the high pressure oil inlet joint 2 through the slit filter element 3 and the oil passage 4 into the injector chamber 5. The injector chamber 5 is a cavity between the control plunger 17 and the needle seat surface 28. The needle valve 18 is dropped on the needle seat surface 28 by the pressure of the needle valve spring 13, thereby closing the oil passage to the injection hole 29. The injector chamber 5 communicates with the control chamber 55 through the oil passage 40 and the oil inlet orifice 48. The control chamber 55 communicates with the solenoid valve chamber 59 via the oil outlet orifice 56. The solenoid valve chamber 59 communicates with the oil return passage (not shown) of the injector. The oil discharge orifice 56 is sealed by a ball 9 seated on the cone seat surface 8. The ball 9 is pressed against the conical surface 8 by a solenoid spring 14 and an armature 11. The inner chamber 5 and the control chamber 55 are in communication with the rail pressure. The needle valve 18 falls on the needle seat surface 28 under the action of the spring force of the needle valve spring 13 and the oil pressure (the oil pressure is equal to the area of the needle seat surface 28 multiplied by the rail pressure). Both ends of the control plunger 17 are subjected to the same hydraulic pressure and are in a force balance state. When it is desired to initiate the injection, the solenoid valve coil 57 needs to be energized, and the current is about 20 amps. The current excitation generates a magnetic field between the inner magnetic pole 62 of the solenoid valve, the armature 11 and the outer magnetic pole 61. The gap between the armature 11 and the inner pole 62 and the outer pole 61 is about 0. The lmmo magnetic field generates an electromagnetic force, and the attracting armature 1 1 rests on the electrode and compresses the solenoid spring 14. When the armature 1 1 moves upward, the cone seat surface 8 is made The closing force on the upper ball 9 is released, thereby opening the oil passage of the oil outlet orifice 56 to the solenoid valve chamber 59. Once the oil discharge orifice is opened, the control chamber 55 is drained; at the same time, the oil inlet orifice 48 will be oiled. If the inlet orifice and the outlet orifice have the same diameter, when the inlet and outlet oils reach equilibrium, the oil inlet and outlet oil cause the pressure drop of the control chamber 55 to be about 50% of the rail pressure. As the pressure within the control chamber 55 drops, the control plunger pressure is no longer balanced and a pulling force F is created on the needle valve 18. The pulling force F is greater than the combined force of the spring force of the needle valve spring 13 in the opposite direction and the oil pressure on the needle seat surface 28. The action of the pulling force F causes the needle valve 18 to be lifted from the needle seat surface 28, opening the oil passage between the injector inner chamber 5 and the injection hole 29, thereby starting the fuel injection. To stop the injection, cut off the solenoid valve current. At this time, the electromagnetic force disappears, and the spring force of the solenoid spring 14 forces the armature 11 to move downward, and the ball 9 closes the oil orifice 56. The oil in the oil inlet orifice 48 causes the pressure in the control chamber 55 to rise. The plunger is re-pressure balanced and the spring force of the needle spring 13 cannot be overcome and the needle valve 18 cannot be lifted. The needle valve falls back on the needle seat surface 28, closing the oil passage leading to the injection hole, at which point the injection is completed. Several forms of solenoid valves of the present invention are described in detail below: The solenoid valve armature of the present invention is non-parallel and does not require a guiding structure. The armature 11 is a flat plate structure, and the side opposite to the solenoid spring 14 is always in contact with the solenoid valve body 60. The solenoid spring 14 is offset relative to the center of the valve in which the ball 9 is seated. When the solenoid valve is de-energized, the spring force presses the armature 11 against the ball, generating torque to the ball to seal the ball and the valve seat, and making the armature and the solenoid valve body stably contact. After the solenoid valve is energized, the armature of the flat structure is turned over along the contact line with the valve body and compresses the spring, so that the ball is separated from the valve seat, thereby achieving fuel injection. First and Second Embodiments As shown in Figs. 2 and 4, the solenoid valve body 60 includes a U-shaped spool 90, an internal magnetic pole 62, and an external magnetic pole 61. The spool 90 is disposed in the inner cavity 70 of the valve body, and the spool magnetic pole is engaged with the armature clearance. A solenoid valve coil 57 is wound around the inner pole 62 for driving the solenoid valve. The armature 1 1 side is radially connected to the valve body 60, and the direct connection method (the first embodiment shown in FIG. 2 and FIG. 3) and the ball pin connection manner can be used (as shown in FIG. 4 and FIG. 5). The second embodiment) is: the solenoid valve body 60 - the side setting pin 65, the positioning pin and the valve body are interference fit, the positioning pin extends out of the valve body portion and is disposed in the positioning hole 80 of the armature, the positioning pin and the armature The clearance fit (ie, the aperture of the locating aperture is slightly larger than the diameter of the locating pin) to allow the armature to move within a certain range. The other side of the armature 1 1 is elastically connected to the valve body, that is, the force of the solenoid valve spring 14 when the solenoid valve is de-energized causes the armature 11 to act on the guide ram 63 of the valve. Guided top The rod 63 biases the ball 9 against the valve seat (i.e., the conical surface 8). The radial positioning of the armature is in contact with the valve body 60, and the contact force and spring force are substantially equal, depending on the distance of the solenoid spring and the contact line 64 from the center of the valve. After the solenoid valve is energized, the inner magnetic pole 62 and the outer magnetic pole 61 attract the armature and compress the spring 14, thereby separating the ball from the valve seat. As shown in Figures 3 and 4, there is a bottom view of the valve body 60 when there is no armature. The positions of the outer magnetic pole 61 and the inner magnetic pole 62 are close to the center of the solenoid valve, and the right hole in the figure is the solenoid valve spring mounting hole 71, and the two holes on the left side are positioning pin holes. The solenoid valve coil 57 is wound around the inner magnetic pole 62. The solenoid valve core and the outer magnetic pole 61 and the inner magnetic pole 62 are both located in the inner cavity 70 of the valve body 60. As shown in FIG. 6 to FIG. 8, in addition to the positioning pin hole 80, there are one or more oil passage holes 81, and the oil passage holes are vertically penetrated with respect to the armature to improve the fuel circulation around the armature during the movement of the armature. the amount. The oil on the side of the armature moves to the other side, and the oil hole 81 provides a straight-through oil passage from one side to the other. There are also one or more over-sink grooves 83 to make the fuel flowing into the oil hole 81 and around the armature smoother. The circulation around the armature is very important to prevent side pressures, as side pressures reduce electromagnetic forces and increase response time. The surface of the armature 11 is flat. There is a step 85 on the side adjacent to the spring of the solenoid valve. As shown in Fig. 7, the protrusion of the step 85 is "X", which acts as an armature limit. After the solenoid valve is energized, The armature strikes the plane of the solenoid valve body, and the steps are arranged to prevent damage to the magnetic pole and reduce residual magnetic attraction. Figure 8 is a cross-sectional view orthogonal to the cross section of Figure 7. In addition to the oil-sink tank 83, there are a number of micro-slots 84 that are vertically disposed relative to the oil-sink tank 83, particularly when the armature is very close to the poles, to increase fuel throughput. As shown in Fig. 13, the manner in which the spool 90 and the solenoid valve body 60 are connected is shown. The valve body 90 has two convex portions 92 on both sides thereof, and is fastened to the valve body 60 by screws 94 by a washer 91, so that the convex portion 92 is snap-fitted to the washer 91. The top surface 93 of the spool 90 is pressed into the valve body cavity 70. After the valve core is loaded into the valve body cavity, the coil (not shown) is assembled and connected, and the solenoid valve is plastically sealed. Finally, the bottom plane of the solenoid valve is ground, including the magnetic pole and the solenoid valve outer cover. Figure 14 shows a bottom view of the solenoid valve and the shape of the spool. Third Embodiment With respect to the first and second embodiments, the spool structure of the solenoid valve of the third embodiment is changed, and the remaining structural features are the same. As shown in Fig. 9, the spool 90' of the solenoid valve has a pot-type spool structure having an outer magnetic pole 61 and an inner magnetic pole 62, and a solenoid valve coil 57 is wound around the inner magnetic pole 62. This type of spool is suitable for cylindrical devices. Figure 10 is a bottom plan view of the pot type solenoid valve. FOURTH EMBODIMENT Figure 11 shows another variation of the ram between the armature and the ball, the ram being unguided, i.e., the non-guide ram 63', which can slide over the back of the armature 11. The ball 9 is seated on the cone seat surface 8 for sealing. This type of valve has a low mass and reduces the impact force when the armature moves to the seat or limit surface. FOURTH EMBODIMENT Figure 12 shows another variation of the contact structure of the ball with the valve seat surface, i.e. the seat surface is flat, and accordingly, the ball 9 has a plane 7 adapted to the seating surface for sealing the plane. Small oil holes. The deformation of the jack and the deformation of the ball in the fourth and fifth embodiments described above can be applied to the solenoid valve of the kettle type spool, and can also be applied to the solenoid valve of the U-shaped spool. Sixth Embodiment FIG. 15 shows another configuration in which the armature limit step is disposed in the solenoid valve, that is, in the cylindrical valve body cavity 70 of the solenoid valve body 60, the solenoid valve spool 90 and the solenoid valve are disposed. The coil 57, the rigid metal piece 100 for the armature limit, and the solenoid valve spring 13, as shown in Fig. 16, such a solenoid valve structure allows the magnetic pole area of the solenoid valve spool 90 to be as large as possible, and the metal piece 100 is in the solenoid valve spring One side convex portion serves as the armature limit step 102, and the convex portion on the opposite side serves as the armature turning step 101, and FIG. 17 shows a bottom view of the rigid metal piece 100 and the two steps 101, 102, and the matching armature can surround The step 101 is turned over and is limited by the step 102. Figure 18 shows a side view of the rigid metal sheet 100 from the side of the limiting step 102, with a plurality of molding process holes 103 disposed on the sides thereof to enhance the plastic sealing process performance. Such a solenoid valve structure simplifies the machining process as a whole. Fig. 19 is an armature used in conjunction with the sixth embodiment of the solenoid valve. The armature adopts a flat plate structure, and a vertically penetrating oil passage hole 81 is provided therein for providing a fuel passage from one side to the other side when the armature moves. A positioning pin hole 80 is provided on one side of the armature for radially positioning connection with the solenoid valve, and a solenoid valve spring mounting hole 71 is also provided on the opposite side. In the sixth embodiment, the armature limit type is applicable to the solenoid valve of the kettle type spool, and can also be applied to the solenoid valve of the U-shaped spool. The ram used in conjunction therewith can be a guided and non-guided structure, and the ball and the valve seat can be spherical or planar. The solenoid valve armature of the present invention has non-parallel motion and does not need a guiding structure, and the missiles on both sides are separated. The function of the spring and the positioning pin can generate torque to the ball and make the armature and the solenoid valve body stably contact, thereby avoiding the disadvantages of the prior art parallel guide armature processing being expensive, sensitive to cleanliness and easy to wear.

^Mountain

3⁄4. The above disclosure is only a few specific embodiments of the present invention, but the present invention is not limited thereto, and any changes that can be made by those skilled in the art should fall within the protection scope of the present invention.

Claims

Rights request

A solenoid valve for an injector, comprising a valve body, a valve core, and an armature assembly, the armature assembly including an armature and a ball engaged with the armature, the valve core being located in a cavity of the valve body The spool includes a spool magnetic pole and a coil wound at a corresponding position of the spool magnetic pole, the armature being clearance-fitted with the spool magnetic pole, wherein the armature is on a side offset from the center thereof and the valve body The connection, and the resilient connection to the valve body on the other side offset from the center, causes the armature to produce a non-parallel movement after the solenoid valve is de-energized, thereby applying an eccentric torque to the ball that biases it against the valve seat.

2. The solenoid valve according to claim 1, wherein one side of the armature is radially positioned and connected to the valve body, and the radial positioning connection is specifically: a position hole on the armature side, positioning direct sales and The valve body has an interference fit, and the positioning direct-extending valve body portion is disposed in the positioning hole of the armature, and the positioning direct-seat and the armature clearance fit to allow the armature to move within a certain range.

3. The solenoid valve according to claim 1, wherein one side of the armature is radially positioned and connected to the valve body, and the radial positioning connection is specifically: a position hole on the armature side, positioning the ball pin In cooperation with the valve body, the positioning ball pin extends out of the valve body portion and is disposed in the positioning hole of the armature, and the positioning ball pin cooperates with the armature gap to allow the armature to move within a certain range.

The solenoid valve according to any one of claims 1 to 3, wherein a spring is disposed between the other side of the armature and the valve body, and the spring has a certain center with respect to the valve centered by the ball Offset, when the solenoid valve is de-energized, the spring force presses the armature against the ball, generating an eccentric torque to the ball, so that the ball and the valve seat are sealed; after the solenoid valve is energized, the valve core magnetic pole attracts the armature, the armature along the valve body The contact line flips and compresses the spring, separating the ball from the valve seat.

The solenoid valve according to any one of claims 1 to 3, wherein the armature is a flat plate structure, and the armature is provided with a vertically penetrating oil passage hole for providing one side to another when the armature moves A straight-through oil passage on one side; an oil-sinking groove is provided on the upper surface of the armature for smoothly flowing fuel into the oil passage hole and around the armature.

The solenoid valve according to claim 5, wherein the upper surface of the armature is further provided with a micro-sink, and the micro-sink is disposed perpendicular to the over-sink.

7. The solenoid valve according to claim 6, wherein the upper surface of the armature is further provided Steps for the armature limit.

The solenoid valve according to any one of claims 1 to 3, wherein the valve body is U-shaped, including an outer magnetic pole and an inner magnetic pole, and the coil is wound around the inner magnetic pole.

The solenoid valve according to any one of claims 1 to 3, wherein the valve core is of a pot type including an inner magnetic pole and an outer magnetic pole, and the coil is wound around the inner magnetic pole.

The solenoid valve according to any one of claims 1 to 3, characterized in that a guide ejector is provided between the armature and the ball for transmitting the pressure exerted by the armature on the ball.

The solenoid valve according to any one of claims 1 to 3, wherein a non-guide ejector is disposed between the armature and the ball, and the non-guide ejector is slidable on the back of the armature for The impact force is reduced when the armature moves to the seat or limit surface.

12. The solenoid valve according to claim 10 or 11, wherein the ball is adapted to be coupled to the valve seat, and the contact surface of the ball and the valve seat is spherical or planar.

The solenoid valve according to any one of claims 1 to 3, wherein a convex portion is disposed on both sides of the valve core, the valve core is fixedly connected to the valve body through a gasket, and the gasket is snap-fitted to the valve At the core convex.

The solenoid valve according to any one of claims 1 to 3, wherein the material of the valve body and the armature is a nickel-molybdenum-iron alloy.

The solenoid valve according to any one of claims 1 to 3, characterized in that a rigid structure is provided in the body cavity of the electromagnetic valve for acting as an armature limit step.

16. The solenoid valve according to claim 15, wherein the matching armature is a flat plate structure, and the armature is provided with a vertically penetrating oil passage hole for providing the through oil from one side to the other side when the armature moves. road.

17. An armature according to claim 16, wherein a bit hole is provided on one side for radial positioning connection with the solenoid valve.