Oil nozzle structure with blockage switching function

Abstract

The invention relates to the field of automobile engine oil nozzles, in particular to an oil nozzle structure with a blockage switching function, which comprises an oil nozzle main body and an oil return assembly, and the oil return assembly is communicated with the top end of the oil nozzle main body; an inner cavity of the oil nozzle body is provided with a plurality of oil channels, one ends of the oil channels are communicated with a main channel, and the main channel is located in the center of the inner cavity of the oil nozzle body. By arranging the multiple sets of oil ducts, the pressure sensor, the high-pressure controller and the high-pressure input switch, the pressure sensor is used for detecting the pressure difference of the oil ducts to judge the blocking condition, then the high-pressure controller controls the high-pressure input switch to close the blocked oil ducts and open the normal oil ducts, and the opening and closing plate is driven through pressure linkage to switch oil ways; the problems that in the prior art, when an oil duct of an oil nozzle is blocked, oil injection is prone to being interrupted, shutdown disassembly and cleaning are needed, operation is tedious, maintenance cost is high, an automatic detection and switching mechanism is lacked, and complex working conditions are difficult to adapt are solved.

Description

Technical Field

[0001] The invention relates to the field of automobile engine fuel injection nozzles, and in particular to a fuel injection nozzle structure with a blockage switching function. Background Art

[0002] A fuel injector with application number CN201610351873.6 includes a needle valve, a needle valve body and an oil delivery channel. A conical sealing surface is provided on the inner side of the head of the needle valve body, and an upper row of spray holes and a lower row of spray holes are staggered on the conical sealing surface; the needle valve includes a first needle valve and a second needle valve arranged coaxially and connected by a spring; the first needle valve has an annular boss and can seal the lower row of spray holes; the second needle valve extends into a first annular groove of the annular boss and can seal the upper row of spray holes; when the first needle valve is seated, an axial damping gap is provided between the annular boss and the first annular groove; the above-mentioned first and second needle valves can respectively control fuel injection to complete pre-injection, main injection and post-injection, and at the same time, can greatly improve the cooling of the nozzle head; the axial damping gap plays a buffering role when the first needle valve is seated, effectively preventing rebound and reducing the impact force of seating on the needle valve body, thereby preventing abnormal injection of the injector.

[0003] In the prior art including the above-mentioned patents, the fuel passage inside the fuel injector may be clogged by impurities. In particular, some low-quality fuels are more likely to form deposits inside the fuel injector, reducing the cross-sectional area of the passage and affecting the smooth flow of the fuel, thereby causing the fuel injector to be clogged, resulting in interrupted or uneven fuel injection. When clogged, the engine often needs to be shut down to disassemble and clean the fuel injector, which is not only cumbersome and time-consuming, but also reduces the service life and increases maintenance costs. Therefore, it is necessary to invent a fuel injection nozzle structure with a blockage switching function to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a fuel injector structure with a blockage switching function. By setting up multiple groups of oil channels, pressure sensors, high-pressure controllers and high-pressure input switches, the pressure sensors are used to detect the pressure difference in the oil channels to determine the blockage situation, and then the high-pressure controller controls the high-pressure input switch to close the blocked oil channel and open the normal oil channel, and the pressure linkage drives the opening and closing plate to switch the oil channel, so as to solve the problems in the prior art that when the oil channel of the fuel injector is blocked, the fuel injection is easily interrupted, the machine needs to be shut down for disassembly and cleaning, the operation is cumbersome, the maintenance cost is high, and there is a lack of automatic detection and switching mechanism, making it difficult to adapt to complex working conditions.

[0005] In order to achieve the above object, the present invention provides the following technical solutions: A fuel injector structure with a blockage switching function comprises a fuel injector body and an oil return assembly, wherein the oil return assembly is connected to the top end of the fuel injector body; The inner cavity of the fuel injector body is provided with a plurality of oil passages, one end of each of the plurality of oil passages is connected to a main passage, the main passage is located at the center of the inner cavity of the fuel injector body, a needle valve rod is provided in the main passage, one end of the needle valve rod is slidably plugged into the oil return assembly, a material blocking push plate is provided on the needle valve rod, and one end of the material blocking push plate is slidably fitted with a driven assembly; The second pressure sensor is provided with a plurality of detection probes connected to the oil passage; The inner cavity of the fuel injector body is provided with multiple adjustment channels, one side of the adjustment channel is provided with a groove, a filter is provided in the adjustment channel, one end of the adjustment channel is connected to an annular oil delivery channel, the other end of the annular oil delivery channel is connected to the oil inlet assembly, multiple adjustment channels are provided with adjustment components, one end of the adjustment component is connected to a pressure pipe, the other end of the pressure pipe is connected to a high-pressure input switch, the high-pressure input switch is provided on the side wall of the fuel injector body, the high-pressure gas output end of the high-pressure input switch is connected to the main channel of the inner cavity of the fuel injector body, one end of the high-pressure input switch is electrically connected to a high-pressure controller, and the high-pressure controller is provided on the outer side wall of the fuel injector body.

[0006] As a preferred solution of the present invention, an oil inlet assembly is connected to one side of the fuel injector body, an oil inlet is provided at one end of the oil inlet assembly, an oil outlet is provided at the other end of the oil inlet assembly, a sewage outlet is provided on the side wall of the oil inlet assembly, a valve connected to the oil inlet is provided on the oil inlet, and a first pressure sensor is provided at the bottom of the oil inlet assembly.

[0007] As a preferred solution of the present invention, a second pressure sensor is provided on the side wall of the fuel injector body, and the first pressure sensor is electrically connected to the second pressure sensor.

[0008] As a preferred solution of the present invention, the adjustment assembly includes a slide, a telescopic rod and an opening and closing plate, the opening and closing plate is hinged on the inner side wall of the adjustment channel, the inner bottom wall of the adjustment channel is provided with an annular sealing plate that fits with the opening and closing plate, the top of the opening and closing plate is provided with a first limiting slide groove, the inner cavity of the first limiting slide groove is slidably connected to a slider, the top of the slider is hinged to a connecting rod, the other end of the connecting rod is hinged to the telescopic rod, and the telescopic rod is slidably connected in the groove; The slide is arranged on the other side of the groove, and a spring is provided in the inner cavity of the slide. One end of the spring is connected to the telescopic rod. A limiting clamp is provided in the inner cavity of the slide. The limiting clamp is in contact with the telescopic rod. One end of the pressure tube is connected and inserted into the side close to the limiting clamp, and the other end of the pressure tube is connected and provided with a sliding bin.

[0009] As a preferred solution of the present invention, the oil outlet of the oil inlet assembly is connected to the annular oil delivery channel, and the bottom of the annular oil delivery channel is provided with a plurality of diversion oil delivery channels arranged in a circular array, and the other end of the diversion oil delivery channel is in contact with the filter screen.

[0010] As a preferred solution of the present invention, a plurality of second limiting grooves are provided on the side wall of the main channel, a strip hole is provided between the second limiting grooves and the sliding bin, a plurality of the material blocking push plates are slidably connected to the inner cavities of adjacent second limiting grooves, and one end of the material blocking push plate is provided with an inclined surface; An air passage is provided on the inner side wall of the second limiting sliding groove, and the air passage is communicated with the high-pressure gas output end of the high-pressure input switch.

[0011] As a preferred embodiment of the present invention, the driven assembly includes a telescopic block, a cut-off block, and a sealing slide. The cut-off block is fixedly connected to the inner wall of the main channel. The cut-off block is provided with a circular hole for the needle valve stem to slide through. The outer wall of the cut-off block is provided with a plurality of plug-in slots. The plurality of telescopic blocks are slidably connected to the inner cavities of adjacent plug-in slots. The top and bottom ends of the intercepting block are both provided with through holes communicating with the plug-in slots; One end of the telescopic block is located in the inner cavity of the second limiting slide groove, and one side of the telescopic block is provided with an inclined surface that cooperates with the material blocking push plate; One end of the sealing slide is slidably inserted into the inner cavity of the strip hole, and the other end of the sealing slide is connected to the inner side wall of the sliding bin through a spring.

[0012] As a preferred solution of the present invention, a plurality of fuel injection holes are provided at the bottom end of the fuel injector body, the inner cavities of the plurality of fuel injection holes are connected to the main channel, and one end of the needle valve stem in the inner cavity of the main channel conflicts with the plurality of fuel injection holes.

[0013] As a preferred solution of the present invention, a magnetic induction coil is provided at the top of the inner cavity of the fuel injector body, an armature is provided at the top of the needle valve stem for electromagnetic induction with the magnetic induction coil, one end of the needle valve stem is sleeved with a spring, and the other end of the spring is provided on the inner top wall of the oil return assembly.

[0014] In the above technical solution, compared with the prior art, the technical effects and advantages provided by the present invention are as follows: 1. Multiple oil passages are arranged inside the fuel injector structure. When any of the oil passages is blocked, the second pressure sensor and the first pressure sensor sense the pressure of the corresponding oil passage through the detection probe. Once the pressure value is abnormal, it is determined that the oil passage is blocked. Since the high-pressure controller is electrically connected to the second pressure sensor, the high-pressure controller will control the high-pressure input switch corresponding to the blocked oil passage to close, and at the same time open the oil passage with normal pressure value. When the high-pressure input switch of the normal oil passage is turned on, high pressure enters the slideway through the pressure pipe, pushing the telescopic rod to contract the extrusion spring, pulling the opening and closing plate to open the corresponding adjustment passage, allowing the oil to smoothly enter the main passage, realizing the switching output of the oil passage from the blocked passage to the unblocked passage, avoiding the interruption of injection due to the blockage of a single oil passage, ensuring the continuous and stable operation of the injection operation, significantly improving the working reliability of the fuel injector and the ability to adapt to complex working conditions, and reducing the frequency of equipment shutdown and maintenance due to oil passage problems; 2. During the operation of the fuel injector, if the filter is clogged due to accumulation of impurities, the blockage can be cleared by backwashing. There is no need to dismantle the equipment. Just pressurize the main channel after the needle valve stem seals the injection hole. The increased pressure causes the oil to flow in the opposite direction, and the impurities blocked in the filter and oil channel are discharged through the drain port. This method can improve the cleaning efficiency, reduce maintenance time and labor costs, extend the service life of the product, keep the filter clean, ensure the oil filtration effect, ensure the long-term stable and efficient operation of the fuel injector, and reduce equipment failures caused by filter blockage; 3. By connecting the high-pressure input switch to the main channel, the injection pressure is increased by inputting high-pressure gas into the main channel. At the same time, the high-pressure gas in the pressure tube drives the telescopic rod, which in turn opens and closes the opening and closing plate, realizing intelligent adjustment of the injection pressure and precise control of the oil channel. The high-pressure gas pressurizes the oil in the main channel, which can increase the oil injection speed and distance, enhance the injection atomization effect, and improve fuel utilization. The pressure-driven opening and closing plate flexibly opens or closes the adjustment channel. When an oil channel is blocked, it quickly switches to the normal oil channel to ensure smooth oil flow and stable and continuous injection operation. The two work together to optimize the performance of the injector nozzle, improve the equipment's adaptability to complex working conditions, reduce the probability of failure, reduce maintenance costs, and extend service life. 4. The oil channel pressure is detected by the first and second pressure sensors, and the oil channel blockage status is judged by the pressure difference. Abnormal pressure changes in the oil channel can be captured in real time and accurately. Compared with traditional manual detection or single sensor monitoring, the position of the blocked oil channel can be quickly located, avoiding the continuous operation of the equipment with faults due to untimely manual inspection or misjudgment. Based on accurate pressure difference data, the system can timely trigger the high-pressure controller to control the high-pressure input switch to switch the oil channel, realize automatic isolation of the blocked oil channel and rapid activation of the normal oil channel, ensure uninterrupted injection operation, improve the stability of the injector operation, and reduce equipment downtime loss and maintenance costs caused by oil channel blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0016] Figure 1 It is a schematic diagram of the overall cross-sectional structure of the present invention; Figure 2 This is a schematic diagram of the connection structure between the opening and closing plate and the telescopic rod of the present invention; Figure 3 This is a structural diagram of the connection relationship between the intercepting block and the telescopic block of the present invention; Figure 4 This is a structural diagram of the connection between the telescopic block and the sealing slide of the present invention; Figure 5 It is a schematic structural diagram of the intercepting block of the present invention; Figure 6 This is a schematic diagram of the material blocking push plate and airway structure of the present invention; Figure 7 This is a schematic diagram of the overall appearance of the present invention; Figure 8 It is a schematic diagram of a planar cross-sectional structure of the present invention; Figure 9 Based Figure 8 A schematic diagram of the enlarged structure at point A; Figure 10 Based Figure 8 Schematic diagram of the enlarged structure at point B.

[0017] Description of reference numerals: 1. Nozzle body; 101. Adjustment channel; 11. Annular oil delivery channel; 111. Diverter oil delivery channel; 12. Adjustment assembly; 120. Slide; 121. Telescopic rod; 122. Opening and closing plate; 13. Needle valve stem; 14. Material blocking push plate; 15. Follower assembly; 151. Telescopic block; 152. Cut-off block; 153. Sealing slide; 2. Oil inlet assembly; 21. Valve; 3. First pressure sensor; 4. Second pressure sensor; 5. High-pressure input switch; 51. High-pressure controller; 6. Oil return assembly. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0019] The present invention provides Figures 1-10The fuel injector structure with a blocking switching function shown in the figure comprises a fuel injector body 1 and an oil return assembly 6, which is connected to the top of the fuel injector body 1. This arrangement allows excess oil to flow back, avoiding oil residue causing oil blockage, ensuring stable oil pressure in the fuel injector and improving operating reliability. The inner cavity of the fuel injector body 1 is provided with a plurality of oil channels, one end of which is connected to a main channel. The main channel is located at the center of the inner cavity of the fuel injector body 1. A needle valve rod 13 is provided in the main channel. One end of the needle valve rod 13 is slidably plugged into the oil return assembly 6. A material blocking push plate 14 is provided on the needle valve rod 13. One end of the material blocking push plate 14 is slidably fitted with a driven assembly 15. The multiple oil channels are designed to realize multi-channel oil supply. When an oil channel is blocked, the other oil channels can continue to work to ensure uninterrupted fuel injection. The main channel serves as the core for oil collection and output, and cooperates with the needle valve rod 13 to accurately control the oil output. The cooperation between the material blocking push plate 14 and the driven assembly 15 provides a linkage basis for subsequent pressure regulation and channel control. The second pressure sensor 4 is provided with a plurality of detection probes connected to the oil passages; the plurality of detection probes can monitor the pressure of each oil passage in real time, promptly detect abnormal pressure conditions, and quickly locate blocked oil passages, so that the system can take timely countermeasures and improve the timeliness and accuracy of injector fault detection; The inner cavity of the fuel injector body 1 is provided with a plurality of regulating channels 101, a groove is provided on one side of the regulating channel 101, a filter is provided in the regulating channel 101, one end of the regulating channel 101 is connected to an annular oil delivery channel 11, the other end of the annular oil delivery channel 11 is connected to the oil inlet assembly 2, a regulating assembly 12 is provided in the plurality of regulating channels 101, one end of the regulating assembly 12 is connected to a pressure pipe, the other end of the pressure pipe is connected to a high-pressure input switch 5, the high-pressure input switch 5 is provided on the side wall of the fuel injector body 1, and the high-pressure gas output of the high-pressure input switch 5 is connected to the high-pressure gas output of the high-pressure gas output. The end is connected to the main channel of the inner cavity of the fuel injector body 1, and one end of the high-pressure input switch 5 is electrically connected to the high-pressure controller 51, which is arranged on the outer wall of the fuel injector body 1; the regulating channel 101 and the filter screen filter and purify the oil to reduce the entry of impurities into the main channel and reduce component wear; the annular oil delivery channel 11 evenly distributes the oil to each regulating channel 101; the regulating component 12, the pressure pipe, the high-pressure input switch 5 and the high-pressure controller 51 work together to realize automatic switching and pressure regulation when the oil channel is blocked, thereby ensuring stable and efficient operation of the fuel injector.

[0020] Furthermore, an oil inlet assembly 2 is connected to one side of the injector body 1. An oil inlet port is located at one end of the assembly 2, an oil outlet port is located at the other end, a drain port is located on the sidewall of the assembly 2, and a valve 21 is provided on the assembly 2, communicating with the oil inlet port. A first pressure sensor 3 is located at the bottom of the assembly 2. The assembly 2 facilitates the input and output of oil, while the drain port removes impurities and dirt from the oil circuit, keeping it clean. Valve 21 facilitates the flow of oil, facilitating equipment maintenance and overhaul. The first pressure sensor 3 assists in monitoring the oil inlet pressure, complementing the data provided by the second pressure sensor 4 to provide a more comprehensive understanding of the oil circuit pressure status.

[0021] Furthermore, a second pressure sensor 4 is provided on the side wall of the fuel injector body 1, and the first pressure sensor 3 is electrically connected to the second pressure sensor 4. The electrical connection of the two pressure sensors enables data sharing and collaborative analysis. By comparing pressure data at different locations, the oil channel blockage can be more accurately determined, improving the accuracy of fault diagnosis and providing a reliable basis for timely addressing blockage issues.

[0022] Furthermore, the adjusting assembly 12 includes a slide 120, a telescopic rod 121 and an opening and closing plate 122. The opening and closing plate 122 is hinged on the inner wall of the adjusting channel 101. The inner bottom wall of the adjusting channel 101 is provided with an annular sealing plate that fits with the opening and closing plate 122. The top of the opening and closing plate 122 is provided with a first limiting slide groove. The inner cavity of the first limiting slide groove is slidably connected with a slider. The top of the slider is hinged with a connecting rod. The other end of the connecting rod is hinged with the telescopic rod 121, and the telescopic rod 121 is slidably connected in the groove; the slide 120 is provided on the other side of the groove, and the inner cavity of the slide 120 is provided with a spring. One end of the spring is connected to the telescopic rod 121. The inner cavity of the slide 120 is provided with a limiting snap ring, which conflicts with the telescopic rod 121. One end of the pressure pipe is connected and inserted into the side close to the limiting snap ring, and the other end of the pressure pipe is connected with a sliding bin. The structural design of the adjustment component 12 ensures that when the high-pressure input switch 5 is turned on, the high pressure in the pressure tube pushes the telescopic rod 121, driving the opening and closing plate 122 to open the adjustment channel 101, thereby achieving smooth oil transportation; the annular sealing plate ensures the sealing of the opening and closing plate 122 when it is closed, preventing oil leakage; the spring and the limit clamp ring provide reset and limit functions for the telescopic rod 121, ensuring stable and reliable operation of the adjustment component 12 and realizing flexible opening and closing control of the oil channel.

[0023] Furthermore, the oil outlet of oil inlet assembly 2 communicates with annular oil channel 11. The bottom of annular oil channel 11 is provided with a plurality of diverter channels 111 arranged in a circular array. The other ends of diverter channels 111 are in contact with the filter screen. The annular oil channel 11 and diverter channels 111 evenly distribute the oil, ensuring balanced oil flow to each regulating channel 101 and improving the uniformity of oil delivery. After passing through diverter channels 111, the oil fully contacts the filter screen, ensuring effective filtration, further improving the cleanliness of the oil entering the main channel, and extending the service life of the fuel injector.

[0024] Furthermore, the sidewalls of the main channel are provided with multiple second limiting slots, each connected to the sliding compartment by a strip-shaped hole. Multiple material-blocking push plates 14 are slidably connected within the inner cavities of adjacent second limiting slots, with one end of each of the two blocking push plates 14 being inclined. Air passages are provided on the inner sidewalls of each of the second limiting slots, connecting to the high-pressure gas output port of the high-pressure input switch 5. The second limiting slots and strip-shaped hole provide movement guidance and space for the blocking push plates 14, and the inclined surface facilitates their interaction with the driven assembly 15. The air passages connect to the high-pressure input switch 5, allowing high-pressure gas to be introduced into the main channel at the appropriate time, pressurizing the oil, increasing the speed and distance of oil injection, and enhancing the spray effect and atomization.

[0025] Furthermore, the driven assembly 15 includes a telescopic block 151, a cut-off block 152 and a sealing slide 153. The cut-off block 152 is fixedly connected to the inner wall of the main channel. A circular hole is provided on the cut-off block 152 for the needle valve stem 13 to slide through. A plurality of plug-in slots are provided on the outer wall of the cut-off block 152. A plurality of telescopic blocks 151 are slidably connected to the inner cavities of adjacent plug-in slots; the top and bottom ends of the cut-off block 152 are provided with through holes connected to the plug-in slots; one end of the telescopic block 151 is located in the inner cavity of the second limiting slide groove, and one side of the telescopic block 151 is provided with an inclined surface setting that cooperates with the material blocking push plate 14; one end of the sealing slide 153 is slidably inserted into the inner cavity of the strip hole, and the other end of the sealing slide 153 is connected to the inner wall of the sliding bin through a spring. The driven component 15 is linked with the material blocking push plate 14. When the material blocking push plate 14 moves, it drives the telescopic block 151 to block the through hole on the intercepting block 152 to ensure the stability of the pressure in the main channel; the sealing slide 153 seals the pressure tube under the action of the spring to prevent the air pressure of the slide 120 from entering the main channel and interfering with the operation of the opening and closing plate 122, thereby ensuring that the regulating channel 101 is unobstructed and maintaining the normal operation of the injector.

[0026] Furthermore, the bottom end of the nozzle body 1 is equipped with multiple spray holes. The inner cavities of these multiple spray holes are connected to the main channel, and one end of the needle valve stem 13 in the main channel inner cavity contacts the multiple spray holes. The multiple spray holes increase the oil spray area, improving spray uniformity and atomization. The needle valve stem 13 cooperates with the spray holes to precisely control the oil output and the timing of oil discharge, achieving precise injection to meet the needs of different operating conditions.

[0027] Furthermore, a magnetic induction coil is installed at the top of the inner cavity of the fuel injector body 1, and an armature is installed at the top of the needle valve stem 13, which generates electromagnetic induction with the magnetic induction coil. A spring is sleeved on one end of the needle valve stem 13, and the other end of the spring is mounted on the inner top wall of the oil return assembly 6. The magnetic induction coil and armature utilize the principle of electromagnetic induction to achieve automated control of the needle valve stem 13, precisely regulating the fuel injection action. The spring provides a reset force for the needle valve stem 13, ensuring that it accurately returns to its initial position, ensuring stable and reliable operation of the fuel injector and improving the accuracy and response speed of fuel injection control.

[0028] Working principle: The first step is to open the valve 21 and input the oil into the annular oil channel 11 through the oil inlet. The oil passes through the multiple oil holes opened at the bottom of the annular oil channel 11 and is filtered through the filter before entering the regulating channel 101. At this time, when a blockage occurs in the oil channel, the pressure sensing of the second pressure sensor 4 and the first pressure sensor 3 detects that the pressure value in the corresponding oil channel is abnormal, and it is determined that a blockage occurs in the oil channel at this end. Due to the electrical connection between the high-pressure controller 51 and the second pressure sensor 4, the high-pressure controller 51 controls the high-pressure input switch 5 at the corresponding position to close the high-pressure input of the blocked oil channel and simultaneously open the oil channel with normal pressure value. The process of opening and closing the oil channel is as follows: when the high-pressure input switch 5 is turned on, high pressure enters the slideway 120 through the pressure pipe connected thereto, pushing the telescopic rod 121 to contract the compression spring and pulling the opening and closing plate 122 to open the corresponding regulating channel 101. The oil enters the main channel through the oil channel, cooperates with the magnetic induction coil to drive the armature and drive the needle valve stem 13 to contract toward the top, so that the oil is sprayed out through the oil spray hole; It should be noted that during the process, when the needle valve stem 13 moves toward the top, it drives the material blocking push plate 14 connected to the outer wall of the needle valve stem 13 to move synchronously. When the material blocking push plate 14 is separated from the air outlet end of the airway, high pressure is ejected from the high pressure gas output end of the high pressure input switch 5 and enters the main channel. After the high pressure enters the main channel, it pressurizes the oil in the main channel. After pressurization, the oil ejection speed and distance can be increased, thereby improving the injection efficiency and oil output rate. When the pressure switch 5 is closed, the spring in the slide 120 pushes the telescopic rod 121 and the opening and closing plate 122 to seal the inner cavity of the regulating channel 101; When it is necessary to backwash the filter in the inner cavity of the regulating channel 101, the needle valve stem 13 can be used to seal the oil injection hole and pressurize the main channel. When the pressure increases and cannot be sprayed out through the oil injection hole, the pressure in the inner cavity of the main channel increases, and the oil in the main channel will be pressurized and squeezed into the oil channel. At this time, the valve 21 is closed, and the oil in the oil channel is pushed to the drain port for discharge. The drain port can be connected to a pipe with a one-way valve. When the valve 21 is closed, the oil flows in the opposite direction to clean the filter and can be discharged through the drain port, so that the clogged filter and impurities in the clogged oil channel can be flushed out by high pressure. Compared with the traditional method of disassembling the equipment for cleaning, the cleaning efficiency and cleaning cost are improved, and the service life of the product is increased.

[0029] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A fuel injector structure with a blockage switching function, characterized in that: It comprises a fuel injector body (1) and an oil return assembly (6), wherein the oil return assembly (6) is connected and arranged at the top end of the fuel injector body (1); The inner cavity of the fuel injector body (1) is provided with a plurality of oil passages, one end of the plurality of oil passages is connected to a main passage, the main passage is located at the center of the inner cavity of the fuel injector body (1), a needle valve rod (13) is provided in the main passage, one end of the needle valve rod (13) is slidably plugged into the oil return assembly (6), a material blocking push plate (14) is provided on the needle valve rod (13), and one end of the material blocking push plate (14) is slidably fitted with a driven assembly (15); The second pressure sensor (4) is provided with a plurality of detection probes connected to the oil channel; The inner cavity of the fuel injector body (1) is provided with a plurality of regulating channels (101), one side of the regulating channel (101) is provided with a groove, a filter is provided in the regulating channel (101), one end of the regulating channel (101) is connected to an annular oil delivery channel (11), the other end of the annular oil delivery channel (11) is connected to the oil inlet assembly (2), a regulating assembly (12) is provided in the plurality of regulating channels (101), one end of the regulating assembly (12) is connected to a pressure pipe, the other end of the pressure pipe is connected to a high-pressure input switch (5), the high-pressure input switch (5) is provided on the side wall of the fuel injector body (1), the high-pressure gas output end of the high-pressure input switch (5) is connected to the main channel of the inner cavity of the fuel injector body (1), one end of the high-pressure input switch (5) is electrically connected to a high-pressure controller (51), and the high-pressure controller (51) is provided on the outer wall of the fuel injector body (1).

2. The fuel injector structure with a blockage switching function according to claim 1, characterized in that: One side of the fuel injector body (1) is connected to an oil inlet assembly (2), one end of the oil inlet assembly (2) is provided with an oil inlet, the other end of the oil inlet assembly (2) is provided with an oil outlet, a side wall of the oil inlet assembly (2) is provided with a sewage outlet, the oil inlet assembly (2) is provided with a valve (21) connected to the oil inlet, and a first pressure sensor (3) is provided at the bottom of the oil inlet assembly (2).

3. The fuel injector structure with a blockage switching function according to claim 2, characterized in that: A second pressure sensor (4) is provided on the side wall of the fuel injection nozzle body (1), and the first pressure sensor (3) is electrically connected to the second pressure sensor (4).

4. The fuel injector structure with a blockage switching function according to claim 1, characterized in that: The adjustment assembly (12) includes a slideway (120), a telescopic rod (121) and an opening and closing plate (122), wherein the opening and closing plate (122) is hinged on the inner side wall of the adjustment channel (101), an annular sealing plate is provided on the inner bottom wall of the adjustment channel (101) and is in contact with the opening and closing plate (122), a first limiting slide groove is provided on the top of the opening and closing plate (122), a slider is slidably connected to the inner cavity of the first limiting slide groove, a connecting rod is hinged on the top of the slider, the other end of the connecting rod is hinged to the telescopic rod (121), and the telescopic rod (121) is slidably connected in the groove; The slideway (120) is provided on the other side of the groove, and a spring is provided in the inner cavity of the slideway (120), one end of the spring is connected to the telescopic rod (121), and a limiting clamp is provided in the inner cavity of the slideway (120), and the limiting clamp is in contact with the telescopic rod (121). One end of the pressure pipe is connected and inserted on the side close to the limiting clamp, and the other end of the pressure pipe is connected and provided with a sliding bin.

5. The fuel injector structure with a blockage switching function according to claim 1, characterized in that: The oil outlet of the oil inlet assembly (2) is in communication with the annular oil delivery channel (11). The bottom of the annular oil delivery channel (11) is provided with a plurality of diverter oil delivery channels (111) arranged in an annular array. The other end of the diverter oil delivery channel (111) is in contact with the filter screen.

6. The fuel injector structure with a blockage switching function according to claim 4, characterized in that: A plurality of second limiting slots are provided on the side wall of the main channel, a strip hole is provided between the second limiting slots and the sliding bin, a plurality of the material blocking push plates (14) are slidably connected in the inner cavity of the adjacent second limiting slots, and one end of the material blocking push plate (14) is provided with an inclined surface; An air passage is provided on the inner side wall of the second limiting sliding groove, and the air passage is connected to the high-pressure gas output end of the high-pressure input switch (5).

7. The fuel injector structure with a blockage switching function according to claim 6, characterized in that: The driven assembly (15) includes a telescopic block (151), a cut-off block (152) and a sealing slide (153), wherein the cut-off block (152) is fixedly connected to the inner wall of the main channel, and a circular hole for the needle valve stem (13) to slide through is provided on the cut-off block (152), and a plurality of plug-in slots are provided on the outer wall of the cut-off block (152), and the plurality of telescopic blocks (151) are all slidably connected to the inner cavities of adjacent plug-in slots; The top and bottom ends of the intercepting block (152) are both provided with through holes communicating with the plug-in slot; One end of the telescopic block (151) is located in the inner cavity of the second limiting slide groove, and one side of the telescopic block (151) is provided with an inclined surface that cooperates with the material blocking push plate (14); One end of the sealing slide plate (153) is slidably inserted into the inner cavity of the strip-shaped hole, and the other end of the sealing slide plate (153) is connected to the inner side wall of the sliding bin via a spring.

8. The fuel injector structure with a blockage switching function according to claim 7, characterized in that: The bottom end of the fuel injection nozzle body (1) is provided with a plurality of fuel injection holes, the inner cavities of the plurality of fuel injection holes are communicated with the main channel, and one end of the needle valve rod (13) in the inner cavity of the main channel abuts against the plurality of fuel injection holes.

9. The fuel injector structure with a blockage switching function according to claim 8, characterized in that: A magnetic induction coil is provided at the top end of the inner cavity of the fuel injector body (1), an armature for electromagnetic induction with the magnetic induction coil is provided at the top end of the needle valve stem (13), a spring is sleeved on one end of the needle valve stem (13), and the other end of the spring is provided on the inner top wall of the oil return assembly (6).

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