Oil injection control valve

Abstract

The invention discloses a fuel injection control valve, and relates to the technical field of fuel injection control, the fuel injection control valve comprises a valve body, a control valve seat, a fuel injection assembly, an armature, a driving part and a fuel inlet pipe, the middle part of the control valve seat is provided with a main runner and a plurality of auxiliary runners, and the middle part of the armature is provided with a fuel inlet groove, a switching groove and an emptying groove; the height of the armature is controlled through the driving piece, and oil is injected into the pressure cavity when the oil inlet groove communicates with the main runner. When the switching groove corresponds to the main flow channel, part of the auxiliary flow channels are controlled to communicate with the main flow channel, the position of the switching groove relative to the main flow channel can be controlled to enable the other part of the auxiliary flow channels to communicate with the main flow channel, and the oil output amount of the oil injection assembly is increased. When the emptying groove corresponds to the main runner, all the auxiliary runners communicate with the main runner, and the maximum oil output amount of the oil injection assembly is increased. By arranging the components, the purpose of multi-stage flow control is effectively achieved, and the function of detecting flow path blockage is added.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fuel injection control technology, and particularly relates to a fuel injection control valve. BACKGROUND

[0002] In the field of fuel injection system, the fuel injection control valve as the core executive element of the fuel supply system, its control precision and reliability directly affect the combustion efficiency, emission performance and operation stability of the internal combustion engine. In the prior art, the traditional fuel injection control valve generally adopts electromagnetic driving mode, and the regulation of the fuel injection quantity is realized by changing the flow area through the displacement of the valve core.

[0003] For example, a diesel engine fuel injection electric control pump nozzle with application number CN201029044124.4 includes a plunger pair, a plunger spring, a plunger spring seat, a plunger pad, an elastic retainer, a rocker pad, a fuel injector nut, a solenoid valve and a fuel injector. The fuel injector and the solenoid valve are stacked from bottom to top in the fuel injector nut and are connected with the plunger pair by thread pretightening. An auxiliary pressure oil channel (including a pressure oil channel and a bypass oil channel) and a main pressure oil channel leading to the fuel injector are provided on the pump body and the control valve seat, and the pressure oil channel and the bypass oil channel are each provided with 1-3 pairs.

[0004] The above technical solution has some problems in use, and it is difficult to realize multi-stage flow accurate control, especially in the application scene (such as engine cold start, variable working condition transition stage) requiring progressive fuel quantity regulation. There is a lack of real-time monitoring function of the oil path state. When impurities in the oil cause local flow passage blockage, the system is difficult to perceive the fault in time, and the fuel injection is directly interrupted when the blockage occurs, which exists a safety hazard.

[0005] Therefore, it is necessary to use a fuel injection control valve to solve the above problems. SUMMARY

[0006] The present application aims to provide a fuel injection control valve to solve the problems raised in the background art.

[0007] In order to achieve the above object, the present application provides the following technical scheme: an oil injection control valve, comprising: a valve body, a pressure cavity being formed in the middle part of the valve body; a control valve seat, arranged at the lower end of the valve body, and a main flow channel and a plurality of auxiliary flow channels being formed in the middle part of the control valve seat, the upper ends of the main flow channel and the auxiliary flow channels being communicated with the pressure cavity; an oil injection assembly, the input end of which is communicated with the main flow channel, used for injecting oil, and being screwed at the lower end of the valve body and limiting the control valve seat; an armature, slidably installed in the middle part of the control valve seat, and a control valve spring being installed at the upper end of the armature, an oil inlet groove, a switching groove and a venting groove being formed in the middle part of the armature; an oil inlet pipe, formed in the middle part of the control valve seat, and being communicated with the oil inlet groove; a driving member, sleeved outside the control valve seat, used for adjusting the height of the armature relative to the main flow channel; when the armature moves to make the oil inlet groove communicated with the main flow channel, oil is injected into the pressure cavity; when the switching groove corresponds to the main flow channel, part of the auxiliary flow channels are communicated with the main flow channel, and the position of the switching groove relative to the main flow channel is adjusted to make another part of the auxiliary flow channels communicated with the main flow channel, used for monitoring the blockage of the main flow channel and the auxiliary flow channels, and increasing the output of the oil injection assembly; when the venting groove corresponds to the main flow channel, all the auxiliary flow channels are communicated with the main flow channel, and the maximum output of the oil injection assembly is increased.

[0008] Preferably, further comprising: a guide sleeve, slidably sleeved at the upper end of the valve body, and a plunger spring being sleeved outside the guide sleeve; a plunger core, slidably connected in the pressure cavity, and an oil pressure cavity being formed between the end part of the plunger core and the pressure cavity, and an inclined surface being formed in the middle part of the plunger core; a limiting ball, movably installed in the side wall of the valve body, and one side of the limiting ball being in contact with the inside of the guide sleeve, and the limiting ball limiting the limit position of the plunger core through the inclined surface; the upper end of the plunger core being fixed in the middle part of the guide sleeve through an open washer; and two pin plugs, inserted in one side of the valve body, used for connecting the driving member with the external circuit.

[0009] Preferably, the oil injection assembly comprises: a spring seat, arranged at the lower end of the control valve seat, and an oil guide pipe being formed in the middle part of the spring seat, the oil guide pipe being communicated with the main flow channel; a needle valve seat, arranged below the spring seat, and a plurality of oil injection holes being formed in the bottom of the needle valve seat; a drainage needle valve, slidably installed in the middle part of the needle valve seat, the upper end of the drainage needle valve being placed in the spring seat, and the lower end of the drainage needle valve being capable of plugging the oil injection holes, and an inclined oil groove being formed in the side wall of the drainage needle valve; an oil inlet channel, formed in the needle valve seat, the upper end of the oil inlet channel being communicated with the oil guide pipe, and the lower end of the oil inlet channel corresponding to the inclined oil groove; oil liquid pushing the drainage needle valve to slide upward through the inclined oil groove, so that the oil liquid can be discharged through the oil injection holes; the spring seat pushing the drainage needle valve to slide downward, so that the end part of the drainage needle valve plugs the oil injection holes.

[0010] Preferably, the oil injection assembly further comprises: a needle valve spring arranged in the spring seat and fixedly connected with an inclined platform at the lower end; an intermediate body arranged between the spring seat and the needle valve seat and provided with a groove at the top for matching the inclined platform; the end of the oil discharge needle valve penetrates the intermediate body and abuts against the inclined platform; an oil nozzle cap threadedly mounted at the lower end of the valve body, and the needle valve seat, the intermediate body and the spring seat are sequentially arranged in the middle of the oil nozzle cap.

[0011] Preferably, the assembly further comprises: an inclined sleeve fixedly connected to the upper end of the armature and provided with an inclined surface at the middle; a blocking inclined groove arranged in the middle of the control valve seat and vertically penetrating the main flow channel; a blocking plate slidably arranged in the blocking inclined groove and provided with a spring sheet at one end and in contact with the outer side of the inclined sleeve and at the other end; a positioning hole arranged in the upper end of the control valve seat; and a positioning boss fixedly connected to the lower end of the valve body for limiting the installation position of the control valve seat and the valve body; the blocking inclined groove penetrates the side wall of the positioning hole, and the spring sheet end is in contact with the positioning boss when the positioning boss is inserted into the positioning hole.

[0012] Preferably, the middle of the blocking plate is provided with a blocking hole; the position of the blocking plate is controlled through the inclined sleeve, the overlapping area of the blocking hole and the cross section of the main flow channel is adjusted, and the flow of the main flow channel is controlled.

[0013] Preferably, the upper end of the driving member is fixedly connected with a terminal, and the upper end of the terminal is fixedly connected with a metal contact; the metal contact can be inserted into the end of the two-pin plug; and the metal contact and the two-pin plug are provided with two-pin sealing rings therebetween.

[0014] Preferably, the assembly further comprises: a plunger pad arranged at the upper end of the plunger core; a rocker arm pad arranged at the upper end of the plunger pad; and a C-shaped clasp clamped to the outer side of the rocker arm pad for limiting the placement of the rocker arm pad inside the guide sleeve.

[0015] Preferably, the outer side of the valve body is sleeved with an upper sealing ring, the outer side of the oil nozzle cap is sleeved with a lower sealing ring, and the end of the oil inlet pipe penetrates the side wall of the control valve seat and is arranged between the upper sealing ring and the lower sealing ring.

[0016] The technical effects and advantages of the present application are as follows: 1. The present application effectively achieves the purpose of multi-stage flow control by arranging the control valve seat, the main flow channel, the auxiliary flow channel and the armature, controlling the height of the armature in the control valve seat, controlling part of the auxiliary flow channel to communicate with the main flow channel when the switching groove corresponds to the main flow channel, increasing the output flow, and making all the auxiliary flow channels communicate with the main flow channel when the vent groove corresponds to the main flow channel, achieving the maximum output oil volume.

[0017] 2. This invention adds the function of detecting flow path blockage by setting a main flow channel, a secondary flow channel, an armature, an oil inlet groove, a switching groove, and a venting groove. By controlling the position of the switching groove, the normal output flow of the fuel injection assembly is known. When the input flow does not match the output flow set by the control valve seat, it indicates that the currently connected secondary flow channel or main flow channel is blocked. Switch to another set of secondary flow channels and continue to monitor the amount of oil passing through the flow sensor. If the output is the same, it indicates that the previous set of secondary flow channels was blocked. Then switch to other sets of secondary flow channels again. If the output is still different after switching all sets of secondary flow channels, it indicates that the main flow channel or downstream oil circuit is blocked.

[0018] 3. This invention achieves a slow-to-fast injection method by setting up an inclined sleeve, a sealing plate, a sealing hole, and a spring plate. The armature slides upward to push the inclined sleeve. When the inclined sleeve pushes the sealing plate to move, it adjusts the overlapping area of ​​the sealing hole and the main channel cross-section. The oil in the main channel enters the guide pipe through the sealing hole. At the same time, all the secondary channels are not connected to the main channel. The sealing hole can reduce the flow rate of the oil in the main channel, reduce the output flow rate of the injection assembly, effectively reduce start-up noise, and reduce the emission of harmful gases.

[0019] 4. By setting a switching slot and multiple sets of secondary flow channels, the present invention achieves the purpose of heat dissipation inside. When the switching slot is in the first state, some of the secondary flow channels are connected to the main flow channel, which can carry away the temperature generated by the operation of the corresponding driving component. When the switching slot is in the second state, the other part is cooled. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 This is a cross-sectional view of the overall structure of the present invention.

[0022] Figure 3 This is a schematic diagram of the disassembly of the fuel injection assembly in this invention.

[0023] Figure 4 This is a disassembled schematic diagram of the internal structure of the valve body in this invention.

[0024] Figure 5 This is a cross-sectional view of the control valve seat in this invention.

[0025] Figure 6 This is a schematic diagram showing the location of the oil inlet pipe in this invention.

[0026] Figure 7 This is a schematic diagram showing the unfolded armature in this invention.

[0027] Figure 8 This is a schematic diagram of the state of the switching slot in this invention.

[0028] Figure 9 This is a schematic diagram of the armature position switching in this invention.

[0029] Figure 10 This is a cross-sectional view of the fuel injection assembly in this invention.

[0030] Figure 11 This is a schematic diagram showing the position of the sealing plate in this invention.

[0031] In the diagram: 1. Valve body; 2. Pressure chamber; 3. Control valve seat; 4. Main flow channel; 5. Secondary flow channel; 6. Injection assembly; 601. Spring seat; 602. Oil guide pipe; 603. Needle valve seat; 604. Injection hole; 605. Drain needle valve; 606. Slanted oil groove; 607. Oil inlet channel; 608. Needle valve spring; 609. Slanted platform; 610. Intermediate body; 611. Nozzle cap; 7. Armature; 8. Control valve spring; 9. Drive component; 10. Oil inlet pipe; 701. Oil inlet groove; 702. Switching groove; 703. Vent groove; 11. 11. Guide sleeve; 12. Piston spring; 13. Piston core; 131. Open washer; 14. Oil pressure chamber; 15. Angled platform; 16. Limit ball; 17. Two-pin plug; 171. Plug retaining ring; 18. Angled sleeve; 19. Sealing groove; 20. Sealing plate; 201. Sealing hole; 21. Spring plate; 22. Positioning hole; 23. Positioning boss; 24. Terminal; 25. Metal contact; 26. Two-pin sealing ring; 27. Piston pad; 28. Rocker arm pad; 29. ​​C-type retaining ring; 30. Upper sealing ring; 31. Lower sealing ring. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] This invention provides, for example Figures 1 to 11The fuel injection control valve shown includes a valve body 1 with a pressure chamber 2 in its middle; and a control valve seat 3 disposed at the lower end of the valve body 1, with a main flow channel 4 and multiple secondary flow channels 5 in its middle. The upper ends of the main flow channel 4 and the secondary flow channels 5 are connected to the pressure chamber 2. There are multiple secondary flow channels 5. For ease of understanding, this embodiment divides the multiple secondary flow channels 5 into group A and group B. In actual use, the secondary flow channels 5 can be divided into more groups. The bottom heights of the multiple secondary flow channels 5 are different. In actual use, the number of secondary flow channels 5 in group A and group B can also be set to be different, so that the output flow rate is different when different groups of secondary flow channels 5 are working. The fuel injection assembly 6, whose input end is connected to the main flow channel 4, is used to inject fuel. The fuel injection assembly 6 is located at the lower end of the control valve seat 3 and has a protrusion on its top to ensure that the input end corresponds to the main flow channel 4 after assembly. The fuel injection assembly 6 is threaded to the lower end of the valve body 1 and limits the control valve seat 3. After installation, the control valve seat 3 is clamped between the fuel injection assembly 6 and the valve body 1. The armature 7 is slidably mounted in the middle of the control valve seat 3, and a control valve spring 8 is mounted on its upper end. The bottom of the armature 7 is disc-shaped and extends through the middle of the control valve seat 3, allowing it to slide only up and down relative to the control valve seat 3. The unit is equipped with an oil inlet groove 701, a switching groove 702, and a venting groove 703. The oil inlet groove 701 is used to replenish oil into the pressure chamber 2; the switching groove 702 is used to switch the connection between the A group auxiliary flow channel 5 / B group auxiliary flow channel 5 and the main flow channel 4, increasing the output of the fuel injection assembly 6; the venting groove 703 is used to connect all auxiliary flow channels 5 with the main flow channel 4, so that the fuel injection assembly 6 reaches its maximum output; the drive component 9, which is fitted on the outside of the control valve seat 3, is used to adjust the height of the armature 7 relative to the main flow channel 4. The drive component 9 adopts an electromagnetic coil or other mechanism that can push the armature 7 to slide while ensuring a seal. The component, drive element 9, is electrically connected to a controller and a power supply. The controller controls the magnetic force of drive element 9, thereby controlling the position of armature 7 relative to the main flow channel 4, so as to achieve the connection state of oil inlet groove 701, switching groove 702, and venting groove 703 with the main flow channel 4 respectively. Oil inlet pipe 10 is opened in the middle of control valve seat 3 and can be connected to oil inlet groove 701. When oil inlet groove 701 corresponds to oil inlet pipe 10, external oil pressure pushes oil along oil inlet pipe 10 into oil inlet groove 701, and then enters pressure chamber 2 through main flow channel 4 and secondary flow channel 5 to complete oil replenishment. Multiple oil inlet pipes 10 are provided.

[0034] It should be noted that the control valve seat 3 has multiple bolt mounting holes in the middle, and the drive component 9 has screw holes at the corresponding screw mounting holes. During assembly, the drive component 9 is installed on the outside of the control valve seat 3 by bolts, so that the drive component 9 can stably control the position of the armature 7.

[0035] It should be noted that the height of the armature 7 within the control valve seat 3 is controlled by the drive component 9. When the oil inlet groove 701 is connected to the main flow channel 4, oil is injected into the pressure chamber 2. Simultaneously, all the secondary flow channels 5 correspond to the oil inlet groove 701, allowing the oil to quickly enter the pressure chamber 2 through the oil inlet pipe 10, thus shortening the filling time of the pressure chamber 2. Figure 9 As shown in state (a); when the switching slot 702 corresponds to the main flow channel 4, it controls the A-group auxiliary flow channel 5 to connect with the main flow channel 4, increasing the output of the fuel injection pipe. At the same time, when the oil flows in the A-group auxiliary flow channel 5, it can carry away some of the temperature generated by the operation of the drive component 9, and at the same time increase the output flow of the fuel injection assembly 6. At this time, the switching slot 702 is in the first state, as shown in state (a). Figure 8 As shown in state (a), the switching slot 702 is adjusted to the second state by the drive component 9, as follows. Figure 8 As shown in state (b), at this time, the secondary flow channel 5 of group B is connected to the main flow channel 4 to dissipate heat on another part of the drive component 9, and at the same time, it can also increase the output flow of the fuel injection assembly 6. By switching different secondary flow channels 5, the blockage of the main flow channel 4 and the secondary flow channel 5 can also be monitored. A flow sensor is connected to the output end of the fuel pump of the fuel injection control valve, and the normal output flow of the fuel injection assembly 6 is known by controlling the position of the switching slot 702. When the input flow detected by the flow sensor does not match the output flow set by the control valve seat 3, it indicates that the currently connected secondary flow channel 5 or the main flow channel 4 is blocked. At this time, another group of secondary flow channels 5 is switched, and the amount of oil passing through the flow sensor is monitored. When the oil volume is the same as the set output volume, it indicates that the previous set of auxiliary flow channels 5 is blocked. In this case, continue using the current auxiliary flow channel 5. When the oil volume detected by the flow sensor still deviates from the output flow set by the control valve seat 3, it indicates that the main flow channel 4 is blocked. The engine needs to be stopped immediately for inspection of the control valve to reduce damage to the engine. When the venting groove 703 corresponds to the main flow channel 4, all auxiliary flow channels 5 are connected to the main flow channel 4, increasing the output oil volume of the fuel injection assembly 6. The current output flow rate is the maximum of the fuel injection assembly 6. The venting groove 703 has a protrusion corresponding to the position of the inlet pipe 10, which can seal the inlet pipe 10 to prevent it from connecting to the venting groove 703. Figure 9 As shown in state (b).

[0036] Specifically, it also includes: a guide sleeve 11, which is slidably fitted onto the upper end of the valve body 1, and a plunger spring 12 is fitted on its outer side. The lower end of the plunger spring 12 abuts against the middle of the valve body 1, and the upper end abuts against the outer side of the guide sleeve 11, for pushing the guide sleeve 11 to be held in a position relatively higher than the valve body 1; a plunger core 13, which is slidably connected in the pressure chamber 2, and its end forms an oil pressure chamber 14 with the pressure chamber 2. The outer side of the plunger core 13 is sealed to the inner side of the pressure chamber 2. The oil pressure chamber 14 is used to store oil. The main flow channel 4 and the secondary flow channel 5 are both connected to the bottom of the oil pressure chamber 14. During use, the oil is stored through the plunger core. The plunger core 13 slides up and down to change the volume of the oil pressure chamber 14; when the plunger core 13 slides down, the volume of the oil pressure chamber 14 decreases, and the oil in the oil pressure chamber 14 enters the oil injection assembly 6 through the main flow channel 4 and the secondary flow channel 5; when the plunger core 13 slides up, the volume of the oil pressure chamber 14 increases, and at the same time the drive component 9 controls the armature 7 to slide, so that the oil inlet groove 701 corresponds to the main flow channel 4. At this time, the oil in the oil inlet pipe 10 enters the oil pressure chamber 14 through the oil inlet groove 701, the main flow channel 4 and the secondary flow channel 5, pre-filling the oil for the next injection. The repeated up and down sliding of the plunger core 13 causes the oil injection assembly 6 to spray oil intermittently.

[0037] More specifically, the plunger core 13 has a ramp surface 15 in the middle; a limiting ball 16 is movably mounted on the side wall of the valve body 1, and one side contacts the inner side of the guide sleeve 11. The ramp surface 15 restricts the extreme position of the plunger core 13. When the plunger core 13 slides upward, it is restricted after the ramp surface 15 contacts the limiting ball 16, preventing the plunger core 13 from sliding upward. When the plunger core 13 slides downward, the limiting ball 16 contacts the outer wall of the plunger core 13 without affecting its sliding. The upper end of the plunger core 13 is fixed to the middle of the guide sleeve 11 by an open washer 131. During installation, the plunger core 13 is placed inside the valve body 1, then the limiting ball 16 is placed, and then the guide sleeve 11 and the plunger spring 12 are fitted onto the outside of the valve body 1. Then the guide sleeve 11 is pressed down to deform the plunger spring 12. When the upper end of the plunger core 13 penetrates... After the guide sleeve 11 is installed, the open washer 131 is inserted between the guide sleeve 11 and the plunger core 13. At this time, the plunger spring 12 is reset, and the assembly of the guide sleeve 11 and the valve body 1 is completed. When in use, the plunger spring 12 pushes the guide sleeve 11 to slide upward while pulling the plunger limit to slide upward, increasing the volume of the oil pressure chamber 14. The two-pin plug 17 is plugged into one side of the valve body 1 and is used to connect the drive component 9 to the external circuit. Its lower end is a plug terminal for powering the drive component 9. The upper end of the two-pin plug 17 is equipped with a plug retainer 171. The plunger spring 12 is placed on the upper end of the plug retainer 171 to press the two-pin plug 17 and prevent the two-pin plug 17 from loosening due to vibration during use. The two-pin plug 17 is electrically connected to a corresponding controller and power supply for powering the drive component 9 and controlling the magnetic force of the drive component 9.

[0038] Specifically, the fuel injection assembly 6 includes: a spring seat 601, which is located at the lower end of the control valve seat 3, with a guide pipe 602 in its middle, communicating with the main flow channel 4; multiple protrusions are fixedly connected to the upper end of the spring seat 601; and notches are provided on the control valve seat 3 corresponding to the protrusions to restrict the installation position of the spring seat 601. Conversely, the protrusions can also be fixedly connected to the bottom of the control valve seat 3, with notches provided on the spring seat 601 at corresponding positions to allow the guide pipe 602 to align with the main flow channel 4; and a needle valve seat 603, located below the spring seat 601, with multiple fuel injection holes 604 at its bottom, which can discharge fuel. The oil is fully atomized; the drain needle valve 605 is slidably installed in the middle of the needle valve seat 603, with its upper end placed in the spring seat 601 and its lower end able to block the oil injection hole 604. There is a gap between the lower end of the drain needle valve 605 and the needle valve seat 603 for the oil to pass through. The side wall of the drain needle valve 605 is provided with an inclined oil groove 606, and the lower end of the inclined oil groove 606 is connected to the gap between the drain needle valve 605 and the needle valve seat 603; the oil inlet channel 607 is opened in the needle valve seat 603, with its upper end connected to the oil guide pipe 602 and its lower end corresponding to the inclined oil groove 606. High-pressure oil can push the drain needle valve 605 to slide upward through the inclined oil groove 606.

[0039] It should be noted that the plunger core 13 slides downward to reduce the volume of the oil pressure chamber 14, allowing the oil to enter the inclined oil groove 606 through the oil guide pipe 602 and the oil inlet channel 607. Under the influence of oil pressure, the oil release needle valve 605 is pushed upward to slide, allowing the oil to be discharged through the oil injection hole 604. Subsequently, the oil pressure in the oil pressure chamber 14 reduces the spring seat 601, which pushes the oil release needle valve 605 downward to block the oil injection hole 604 at its end.

[0040] More specifically, the fuel injection assembly 6 also includes: a needle valve spring 608, which is placed inside the spring seat 601 and has a ramp 609 fixedly connected to its lower end; an intermediate body 610, which is placed between the spring seat 601 and the needle valve seat 603, and has a groove on its top that mates with the ramp 609; notches are provided at the contact points between the intermediate body 610 and the spring seat 601 and the needle valve seat 603; protrusions are fixedly connected to the corresponding positions of the spring seat 601 and the needle valve seat 603 to prevent relative rotation during use and thus avoid misalignment of the fuel delivery pipeline; and the end of the drain needle valve 605 passes through the intermediate body 610 and is connected to the ramp 609. When in use, the needle valve spring 608 pushes the drain needle valve 605 to reset via the inclined platform 609. The inclined platform 609 also prevents the drain needle valve 605 from tilting, thus improving the stability of the oil injection. The nozzle cap 611 is threadedly installed at the lower end of the valve body 1. The needle valve seat 603, the intermediate body 610, and the spring seat 601 are sequentially installed in the middle of the nozzle cap 611. During assembly, the needle valve seat 603, the intermediate body 610, and the spring seat 601 are installed sequentially. Then, the nozzle cap 611 is fitted onto its outer side, and a tool is used to thread the nozzle cap 611 to the valve body 1, so that the internal components of the control valve are pressed together.

[0041] Specifically, it also includes: a slanted sleeve 18, which is fixedly connected to the upper end of the armature 7 and has a slanted middle section; the slanted sleeve 18 is fitted onto the outside of the control valve spring 8; a blocking groove 19, which is formed in the middle of the control valve seat 3 and vertically penetrates the main flow channel 4; and a blocking plate 20, which is slidably installed in the blocking groove 19, with one end in contact with the outside of the slanted sleeve 18 and the other end provided with a spring plate 21. The blocking plate 20 and the blocking groove 19 are in a sealing sliding fit, and the spring plate 21 is used to push the blocking plate 20 against the slanted sleeve. The outer side of 18 is in contact; a sealing hole 201 is provided in the middle of the sealing plate 20. The sealing hole 201 coincides with the cross-section of the main flow channel 4. When in use, the oil in the main flow channel 4 enters the oil guide pipe 602 through the sealing hole 201. At the same time, all the secondary flow channels 5 are not connected to the main flow channel 4. The sealing hole 201 can reduce the flow rate of the oil in the main flow channel 4 and reduce the output flow rate of the fuel injection assembly 6. It is used to reduce the amount of fuel, such as in the early stage of engine start-up, to slow down the amount of fuel injected, reduce start-up noise, and reduce the emission of harmful gases.

[0042] It should be noted that by controlling the position of the sealing plate 20 through the inclined sleeve 18, adjusting the overlapping area of ​​the sealing hole 201 and the main flow channel 4, the flow rate of the main flow channel 4 is controlled, so that the fuel injection quantity of the engine can be slow at first and then fast, effectively suppressing the formation of too much combustible mixture during the ignition delay period and reducing the maximum combustion temperature.

[0043] More specifically, it also includes: a positioning hole 22, which is opened at the upper end of the control valve seat 3; a positioning boss 23, which is fixedly connected to the lower end of the valve body 1, used to limit the installation position of the control valve seat 3 and the valve body 1; and a blocking groove 19 that penetrates the side wall of the positioning hole 22. When the positioning boss 23 is inserted into the positioning hole 22, the end of the spring plate 21 contacts the positioning boss 23 and squeezes the spring plate 21 so that the end of the blocking plate 20 can contact the outside of the oblique sleeve 18.

[0044] Specifically, the upper end of the drive component 9 is fixedly connected to a terminal 24, and the upper end of the terminal 24 is fixedly connected to a metal contact 25; the metal contact 25 can be inserted into the end of the two-pin plug 17; a two-pin sealing ring 26 is provided between the metal contact 25 and the two-pin plug 17 to prevent the metal contact 25 from contacting the valve body 1 and causing a short circuit, and to improve the sealing performance of the two-pin plug 17 to avoid oil leakage; the control valve seat 3 is provided with a mounting hole corresponding to the position of the terminal 24; the mounting hole and the terminal 24 limit the installation position of the drive component 9 and the control valve seat 3.

[0045] More specifically, it also includes: a plunger pad 27, which is placed on the upper end of the plunger core 13; a rocker arm pad 28, which is placed on the upper end of the plunger pad 27; and a C-shaped retaining ring 29, which is engaged with the outer side of the rocker arm pad 28 to restrict the rocker arm pad 28 from being placed on the inner side of the guide sleeve 11. In use, the plunger pad 27 is installed on the upper end of the plunger core 13, and the rocker arm pad 28 is installed in the guide sleeve 11 through the C-shaped retaining ring 29. During operation, the rocker arm pad 28 is squeezed by the driving force such as the cam, causing the plunger core 13 to slide downward, and the plunger spring 12 pushes the plunger core 13 to reset.

[0046] Specifically, an upper sealing ring 30 is fitted on the outer side of the valve body 1, and a lower sealing ring 31 is fitted on the outer side of the oil nozzle cap 611; the end of the oil inlet pipe 10 penetrates the side wall of the control valve seat 3, and the penetration point is located between the upper sealing ring 30 and the lower sealing ring 31. The upper sealing ring 30, the lower sealing ring 31 and the control valve installation position form an oil storage chamber, which is connected to the output end of the oil pump for injecting oil into the control valve.

[0047] In summary, the components are installed sequentially. During operation, the position of the armature 7 is controlled by the drive component 9 to adjust the oil inlet groove 701, switching groove 702, and venting groove 703 to correspond with the main flow channel 4, thereby precisely controlling the output flow of the fuel injection assembly 6. During use, the plunger core 13 moves up and down to adjust the volume of the pressure chamber 14. When the volume of the pressure chamber 14 increases, the oil inlet groove 701 corresponds with the main flow channel 4 and the secondary flow channel 5, allowing oil to enter the pressure chamber 14. When the volume of the pressure chamber 14 decreases, the drive component 9 controls the switching groove 702 / venting groove 703 to correspond with the main flow channel 4, allowing oil to enter the guide pipe 602. Under the influence of oil pressure, the drain needle valve 605 is pushed upward to slide, allowing oil to be discharged through the injection hole 604. Subsequently, the oil pressure reduction spring seat 601 in the pressure chamber 14 pushes the drain needle valve 605 downward to slide its end to block the injection hole 604. The plunger core 13 repeatedly slides up and down, causing the injection hole 604 to intermittently spray oil.

[0048] When the engine starts, it is necessary to slow down the amount of fuel injected to ensure complete combustion and reduce the emission of combustible gases. At this time, when the volume of the oil pressure chamber 14 decreases, the armature 7 pushes the inclined sleeve 18 to move, adjusting the overlapping area of ​​the sealing hole 201 and the main flow channel 4. At the same time, all the secondary flow channels 5 are not connected to the main flow channel 4. The sealing hole 201 can reduce the flow rate of the fuel in the main flow channel 4 and reduce the output flow rate of the fuel injection assembly 6. After the engine is fully started, the position of the armature 7 is adjusted so that the sealing hole 201 and the main flow channel 4 are completely overlapped, and the fuel injection quantity gradually increases, achieving a fuel injection rate that is slow at first and then fast.

[0049] When the engine is running smoothly, the armature 7 is moved to the switching slot 702 and connected to the main flow channel 4 by the drive component 9. When the switching slot 702 is in the first state, the A-group auxiliary flow channel 5 is connected to the switching slot 702. When the volume of the oil pressure chamber 14 decreases, the oil in the A-group auxiliary flow channel 5 can mix with the oil in the main flow channel 4, increasing the amount of oil entering the injection assembly 6. At the same time, the oil in the A-group auxiliary flow channel 5 can carry away some of the temperature generated by the operation of the drive component 9. After a certain period of operation, the switching slot 702 is adjusted to the second state, so that the B-group auxiliary flow channel 5 is connected to the main flow channel 4, which cools another part of the drive component 9. When some auxiliary flow channels 5 are blocked, other groups of auxiliary flow channels 5 are switched to make the injector work normally.

[0050] When it is necessary to increase the fuel injection volume to improve the engine output power, the vent valve is switched to connect with the main flow channel 4. At this time, all the secondary flow channels 5 are connected to the main flow channel 4, and the fuel injection assembly 6 reaches the maximum output volume.

[0051] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fuel injection control valve, characterized in that, include: The valve body has a pressure chamber in its middle section; The control valve seat is located at the lower end of the valve body and has a main flow channel and multiple secondary flow channels in the middle. The upper ends of the main flow channel and the secondary flow channels are connected to the pressure chamber. The fuel injection assembly has its input end connected to the main flow channel for injecting fuel, and is threaded to the lower end of the valve body, limiting the position of the control valve seat. An armature is slidably mounted in the middle of the control valve seat, and a control valve spring is mounted on its upper end. An oil inlet groove, a switching groove and a venting groove are provided in the middle of the armature. An oil inlet pipe is located in the middle of the control valve seat and can communicate with the oil inlet groove. The drive unit, fitted onto the outside of the control valve seat, is used to adjust the height of the armature relative to the main flow channel. When the armature moves to connect the oil inlet groove with the main flow channel, oil is injected into the pressure chamber. When the switching groove corresponds to the main flow channel, it controls the connection of a portion of the secondary flow channel with the main flow channel and can control the position of the switching groove relative to the main flow channel to connect another portion of the secondary flow channel with the main flow channel. This is used to monitor the blockage of the main flow channel and the secondary flow channel and increase the output oil volume of the injection assembly. When the venting groove corresponds to the main flow channel, all secondary flow channels are connected to the main flow channel, increasing the maximum output oil volume of the injection assembly.

2. The fuel injection control valve according to claim 1, characterized in that: Also includes: The guide sleeve is slidably fitted on the upper end of the valve body, and a plunger spring is fitted on its outer side; A plunger core is slidably connected in the pressure chamber, and its end forms an oil pressure chamber with the pressure chamber. A sloping platform is formed in the middle of the plunger core. The limit ball is movably mounted on the side wall of the valve body, with one side in contact with the inner side of the guide sleeve, and limits the extreme position of the plunger core through the inclined platform. The upper end of the plunger core is fixed to the middle of the guide sleeve by an open washer; A two-pin plug is inserted into one side of the valve body for connecting the drive unit to an external circuit.

3. The fuel injection control valve according to claim 1, characterized in that: The fuel injection assembly includes: A spring seat is located at the lower end of the control valve seat, and an oil guide pipe is provided in the middle of the spring seat, which is connected to the main channel. The needle valve seat is located below the spring seat and has multiple oil injection holes at the bottom; The oil drain needle valve is slidably installed in the middle of the needle valve seat, with its upper end placed in the spring seat and its lower end able to block the oil injection hole. The side wall of the oil drain needle valve is provided with an oblique oil groove. The oil inlet channel is located inside the needle valve seat, with its upper end connected to the oil guide pipe and its lower end corresponding to the inclined oil groove. The oil pushes the drain needle valve upward through the inclined oil groove, allowing the oil to be discharged through the injection hole; the spring seat pushes the drain needle valve downward so that its end blocks the injection hole.

4. The fuel injection control valve according to claim 3, characterized in that: The fuel injection assembly also includes: A needle valve spring is placed inside the spring seat, and a ramp is fixedly connected to its lower end; The intermediate body is placed between the spring seat and the needle valve seat, and a groove is provided on the top to cooperate with the inclined platform; The end of the drain needle valve passes through the intermediate body and abuts against the inclined platform; The nozzle cap is threadedly installed at the lower end of the valve body, and the needle valve seat, intermediate body and spring seat are sequentially installed in the middle of the nozzle cap.

5. The fuel injection control valve according to claim 1, characterized in that: Also includes: A slanted sleeve is fixedly connected to the upper end of the armature, and the middle part is slanted. The blocking groove is located in the middle of the control valve seat and runs vertically through the main channel; The sealing plate is slidably installed in the sealing groove, with one end in contact with the outside of the inclined sleeve and the other end equipped with a spring plate. A positioning hole is provided at the upper end of the control valve seat; A positioning boss is fixedly connected to the lower end of the valve body and is used to define the installation position of the control valve seat and the valve body. The sealing groove penetrates the side wall of the positioning hole, and the end of the spring plate contacts the positioning boss when the positioning boss is inserted into the positioning hole.

6. The fuel injection control valve according to claim 5, characterized in that: A sealing hole is provided in the middle of the sealing plate; The position of the sealing plate is controlled by the inclined sleeve, and the overlapping area of ​​the sealing hole and the main channel section is adjusted to control the flow rate of the main channel.

7. The fuel injection control valve according to claim 2, characterized in that: The upper end of the drive component is fixedly connected to a terminal block, and the upper end of the terminal block is fixedly connected to a metal contact. The metal contacts can be inserted into the end of a two-pin plug; Two sealing rings are provided between the metal contacts and the two-pin plug.

8. The fuel injection control valve according to claim 2, characterized in that: Also includes: A plunger pad is placed at the top of the plunger core; Rocker arm pad, which is placed on top of plunger pad; The C-type retaining ring is engaged with the outside of the rocker arm pad to restrict the rocker arm pad from being positioned inside the guide sleeve.

9. A fuel injection control valve according to claim 4, characterized in that: An upper sealing ring is fitted on the outside of the valve body, and a lower sealing ring is fitted on the outside of the oil nozzle cap; The end of the oil inlet pipe penetrates the side wall of the control valve seat, and the penetration point is located between the upper and lower sealing rings.

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