An Electric EGR Valve Operation Protection System

Abstract

The present invention discloses an operating protection system for an electric EGR valve, which includes a sleeve that moves in the opposite direction to the valve stem. Scraping boxes are rotatably arranged on the side wall of the sleeve at equal intervals. A thimble that slides axially along the sleeve and is symmetrically arranged about the center of the scraping box is provided on the sleeve. The thimble is in sliding fit with the scraping box through a bump provided thereon. An elastic rod is fixedly arranged on the scraping box. The operating protection system for the electric EGR valve provided by the present invention, after the thimble reaches the exhaust port, receives a thrust force that moves outward along the axis of the sleeve, unlocking the scraping box so that the concave end abuts against the valve stem. After the sleeve resets and moves upward, the carbon deposits on the valve stem can be scraped off. Along with the valve core being inserted into the clamping area formed by a plurality of elastic rods and scraping heads, the apex of the scraping head abuts against the outer end face of the valve core. During the process of the sleeve resetting and moving upward, the scraping head scrapes the carbon deposits on the outer end face of the valve core, effectively solving the problem of carbon deposition on the end face area of the valve core for opening and closing the exhaust port.

Description

Technical Field

[0001] The present invention relates to the technical field of electric valves for automotive engine exhaust gas recirculation systems, and more particularly to an electric EGR valve operation protection system. Background Art

[0002] An electric EGR valve requires a motor to drive a valve core to move linearly through a reduction gear, and is used to control the opening and closing size of the valve, thereby changing the mixing amount of exhaust gas and engine intake air.

[0003] According to the publication (announcement) number: CN206922551U, the publication (announcement) date: January 23, 2018, there is disclosed a motor fixing structure of an electric EGR valve.

[0004] In the prior art including the above patent, the overhaul period of the electric EGR valve is short, which is often caused by a large amount of carbon deposition on the valve core due to incomplete combustion products in the recirculating exhaust gas. Excessive carbon deposition will cause abnormal operation or even damage of the valve core, enabling the exhaust gas to directly enter the engine without being controlled by the electric EGR valve, and causing a series of problems in the engine, affecting the overall safety of the vehicle. Summary of the Invention

[0005] The object of the present invention is to provide an electric EGR valve operation protection system, aiming to solve the problems generated above.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An electric EGR valve operation protection system includes a valve body provided with an exhaust port, an intake port and a motor. A valve rod driven by the motor to move linearly is arranged in the valve body. A valve core is arranged at the end of the valve rod. The system further includes a sleeve that moves in the opposite direction to the valve rod, and scraping boxes are rotatably arranged on the side wall of the sleeve at equal intervals;

[0008] The sleeve is provided with ejector pins that slide axially and are symmetrically arranged about the center of the scraping box, and the ejector pins are in sliding fit with the scraping box through bumps arranged thereon;

[0009] An elastic rod is fixedly arranged on the scraping box, and a scraping head is arranged at the end of the elastic rod;

[0010] Among them, after the two ejector pins move to the exhaust port, they move away from the axis of the sleeve to release the sliding fit with the scraping box, so that the scraping box resets to contact the side wall of the valve rod. At the same time, after the valve core is inserted into and fits with the elastic rod, the vertex of the scraping head abuts against the outer end face of the valve core.

[0011] Preferably, a plurality of second elastic members are hinged between the ejector pins and the sleeve.

[0012] Preferably, it further includes a wire reel driven by a motor. A pressure ring that moves linearly by the winding and unwinding of the wire reel is arranged inside the valve body, and is used to push against the sleeve and the thimble to move.

[0013] Preferably, a notch for the scraping box to move is provided on the side wall of the sleeve, and a door panel embedded in the scraping box is hinged to the notch.

[0014] Preferably, a push rod is arranged at the rotating position of the scraping box, and a cross bar is arranged between the two thimbles;

[0015] When the scraping head abuts against the inner end face of the valve core, the cross bar restricts the elastic rod from bending in the direction close to the axis of the sleeve, and makes the scraping box slide reversely on the sleeve, so that the push rod pushes against the door panel to open the notch.

[0016] Preferably, lower discharge holes are arranged in a circumferential array at the exhaust gas port, and triangular blocks are hinged to the ports of the lower discharge holes;

[0017] A convex strip is arranged on the triangular block, and the convex strip is slidably abutted by the thimble to deflect the triangular block to open the lower discharge hole.

[0018] Preferably, upper discharge holes are provided on the valve body. In the reset state, the sleeve deflects the scraping box by abutting and communicates with the upper discharge holes.

[0019] Preferably, annular cavities communicating with the upper discharge holes and the lower discharge holes are respectively provided on the valve body, and a suction and discharge port is arranged on the cavity.

[0020] Preferably, the scraping box is deflected by abutting to make the scraping head abut against the valve stem, and the cross bar resets away from the elastic rod, so that the elastic rod bends in the direction close to the axis of the sleeve, and pushes against the thimble to slide and cooperate with the scraping box again.

[0021] Preferably, the scraping box slides in the notch due to the deformation of the elastic rod, and the end of the door panel scrapes and cooperates with the inner wall of the scraping box.

[0022] In the above technical solution, an electric EGR valve operation protection system provided by the present invention has the following beneficial effects: The thimble slides downward in the sleeve, causing the force on the convex block against the card slot to be downward, and causing the scraping box to rotate around the shaft block, so that the recessed end of the scraping box moves away from the valve stem. The purpose is to prevent the downward-moving sleeve from scraping carbon deposits, so as to avoid the problem of carbon deposits falling into the exhaust port and causing blockage. When the thimble reaches the exhaust port, it receives a thrust force that moves outward along the axis of the sleeve, so that the convex block disengages from the card slot, and the scraping box is unlocked and the recessed end abuts against the valve stem again. After the sleeve resets and moves upward, it can scrape the carbon deposits on the valve stem, avoiding excessive carbon deposits on the valve stem from affecting the ventilation of the air inlet, and also ensuring the mixing efficiency of the intake air and the exhaust gas, increasing the working stability and safety of the engine. At the same time, it can also reduce the load of the motor traction force, ensure the normal operation of the motor, improve the service life of the motor, and when the inner end face of the valve core abuts against the arc top of the scraping head, it causes the elastic rod to deform and bend until the valve core is inserted into the hoop area formed by the plurality of elastic rods and the scraping head, realizing that the apex of the scraping head abuts against the outer end face of the valve core, and during the upward reset movement of the sleeve, the scraping head scrapes the carbon deposits on the outer end face of the valve core, effectively solving the problem of carbon deposits on the end face of the valve core used to open and close the exhaust port, ensuring the accuracy of the exhaust gas addition and mixing, and improving the efficiency of exhaust gas treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0024] Figure 1 The right view schematic diagram of the electric EGR valve provided by the embodiment of the present invention;

[0025] Figure 2 The right elevation view of the front cross-section of the electric EGR valve provided by the embodiment of the present invention;

[0026] Figure 3 The front cross-section schematic diagram of the electric EGR valve provided by the embodiment of the present invention;

[0027] Figure 4 For Figure 3 The enlarged schematic diagram at position A;

[0028] Figure 5 For Figure 3 The enlarged schematic diagram at position B;

[0029] Figure 6 The front cross-section schematic diagram of the sleeve provided by the embodiment of the present invention;

[0030] Figure 7 For Figure 6Enlarged schematic diagram at position C;

[0031] Figure 8 Schematic diagram of the assembly structure of the scraping box and the ejector pin provided by the embodiment of the present invention.

[0032] Explanation of reference numerals:

[0033] 1. Valve body; 11. Exhaust gas port; 12. Intake port; 13. Motor; 131. Valve rod; 132. Valve core; 2. Pressure ring; 21. Wire reel; 3. Sleeve; 31. Arc convex; 32. Notch; 321. Door panel; 33. Scraping box; 331. Shaft block; 332. First elastic member; 333. Push rod; 334. Card slot; 34. Elastic rod; 341. Scraping head; 4. Ejector pin; 41. Second elastic member; 42. Convex block; 43. Cross bar; 5. Triangular block; 51. Convex strip; 6. Exhaust port; 61. Upper exhaust hole; 62. Lower exhaust hole. Detailed implementation manners

[0034] 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.

[0035] As Figure 1-8 shown, an electric EGR valve operation protection system includes a valve body 1 provided with an exhaust gas port 11, an intake port 12 and a motor 13. A valve rod 131 that moves linearly under the drive of the motor 13 is arranged in the valve body 1. A valve core 132 is arranged at the end of the valve rod 131. The system further includes a sleeve 3 that moves in the opposite direction to the valve rod 131. Scraping boxes 33 are rotatably arranged on the side wall of the sleeve 3 at equal intervals;

[0036] An ejector pin 4 that slides axially on the sleeve 3 and is symmetrically arranged about the center of the scraping box 33 is arranged on the sleeve 3, and the ejector pin 4 is in sliding fit with the scraping box 33 through a convex block 42 arranged thereon;

[0037] An elastic rod 34 is fixedly arranged on the scraping box 33, and a scraping head 341 is arranged at the end of the elastic rod 34;

[0038] Among them, after the two ejector pins 4 move to the exhaust gas port 11, they move away from the axis of the sleeve 3 to release the sliding fit with the scraping box 33, so that the scraping box 33 resets to contact the side wall of the valve rod 131. At the same time, after the valve core 132 is inserted into the elastic rod 34, the two are in contact with each other, so that the vertex of the scraping head 341 abuts against the outer end face of the valve core 132.

[0039] Specifically, the output end of the motor 13 uses a reduction gear transmission to drive the valve rod 131 to move, so as to Figure 3For the installation and use perspective of the valve body 1, when the valve core 132 moves upward away from the exhaust port 11, the exhaust port 11 is opened and engine exhaust gas is mixed into the intake port 12. The exhaust port 11 and the intake port 12 are in a tee shape, which are all prior arts and will not be elaborated here. A cavity for accommodating the sleeve 3 is provided in the valve body 1, so that the sleeve 3 can not interfere with the ventilation work in the intake port 12, ensuring the gas mixing efficiency. The diameter of the sleeve 3 is smaller than that of the intake port 12, so that the sleeve 3 does not interfere with the ventilation of the intake port 12 during the up and down movement, enabling the intake and exhaust gases to be effectively mixed.

[0040] Furthermore, both ends of the scraping box 33 are open, and one end is inside the sleeve 3 while the other end extends out of the side wall of the sleeve 3. The end inside the sleeve 3 is recessed, aiming to have a larger contact surface when the end of the scraping box 33 contacts the side wall of the valve stem 131, ensuring the cleaning effect of the valve stem 131.

[0041] Even further, in the default state, the length of both ends of the ejector pin 4 exceeds that of the sleeve 3, aiming to enable the ejector pin 4 to have an extra stroke relative to the sleeve 3, facilitating the assembly of the movable ejector pin 4 with the scraping box 33. A channel for the ejector pin 4 to move is provided in the sleeve 3. Water droplet hanging-shaped card slots 334 are provided on both side edges of the scraping box 33. The convex block 42 fixedly installed on the ejector pin 4 slides in the card slots 334, aiming to enable the convex block 42 to disengage from the card slots 334 after being subjected to a lateral force, realizing the dual use of the ejector pin 4.

[0042] Still further, a shaft block 331 for assembling a torsion spring (the installation method is a prior art and will not be elaborated here) is fixedly installed on the side wall of the scraping box 33, which is used to provide a rotation axis for the scraping box 33, making the scraping box 33 easy to move.

[0043] Still further, the scraping boxes 33 are arranged in a circular array on the cross-section of the sleeve 3, and the elastic rods 34 are only provided on the scraping boxes 33 at the lower port of the sleeve 3. The elastic rods 34 are specifically made of elastic metal rods, and the scraping heads 341 are in an inverted hook shape, aiming to enable the inner side of the scraping heads 341 to scrape the end face of the valve core 132 for opening and closing the exhaust port 11 to remove carbon deposits, and this end face is the outer end face of the valve core 132. The inner end face of the valve core 132 is adjacent to the valve stem 131.

[0044] When the valve stem 131 drives the valve core 132 to open the exhaust gas port 11, as the ejector pin 4 slides downward in the sleeve 3, the force applied to the bump 42 against the card slot 334 is downward, and the scraping box 33 rotates around the shaft block 331, realizing that the sunken end of the scraping box 33 moves away from the valve stem 131. The purpose is to prevent the downward-moving sleeve 3 from scraping carbon deposits, so as to avoid carbon deposits falling into the exhaust gas port 11 and causing blockage problems. When the ejector pin 4 reaches the exhaust gas port 11, it is subjected to a thrust force moving outward along the axis of the sleeve 3, so that the bump 42 disengages from the card slot 334, and the scraping box 33 is unlocked and the sunken end abuts against the valve stem 131 again. After the sleeve 3 resets and moves upward, it can scrape the carbon deposits on the valve stem 131, avoiding excessive carbon deposits on the valve stem 131 from affecting the ventilation of the air inlet 12, ensuring the mixing efficiency of intake air and exhaust gas, increasing the working stability and safety of the engine, reducing the load on the traction force of the motor 13 at the same time, ensuring the normal operation of the motor 13, and increasing the service life of the motor 13. And when the inner end face of the valve core 132 abuts against the arc top of the scraping head 341, the elastic rod 34 deforms and bends until the valve core 132 is inserted into the hoop area formed by the plurality of elastic rods 34 and the scraping head 341, realizing that the vertex of the scraping head 341 abuts against the outer end face of the valve core 132, and during the process of the sleeve 3 resetting and moving upward, the scraping head 341 scrapes the carbon deposits on the outer end face of the valve core 132, effectively solving the problem of carbon deposits on the end face of the valve core 132 for opening and closing the exhaust gas port 11, ensuring the accuracy of exhaust gas addition and mixing, and improving the efficiency of exhaust gas treatment.

[0045] As a further embodiment provided by the present invention, a plurality of second elastic members 41 are hinged between the ejector pin 4 and the sleeve 3.

[0046] Specifically, the second elastic member 41 is a tension spring. One end of the second elastic member 41 is hinged to the side wall of the ejector pin 4, and the other end is hinged in the duct of the sleeve 3. A baffle is fixedly installed on the ejector pin 4, a tension spring is fixedly installed on the baffle, and the end of the tension spring is slidably connected to the upper end of the duct. The tension spring is annularly arranged outside the ejector pin 4, so that the upper end of the ejector pin 4 can slide vertically and horizontally when passing through the upper end face of the sleeve 3.

[0047] During the vertical and horizontal sliding of the ejector pin 4 in the duct, the hinged second elastic member 41 can adapt to it. When the bump 42 is in the card slot 334, the second elastic member 41 remains deformed, and when the bump 42 disengages from the card slot 334, the second elastic member 41 restores its deformation, ensuring the diversity and stability of the ejector pin 4 during operation.

[0048] As another further embodiment provided by the present invention, it further includes a wire reel 21 driven by the motor 13. A pressing ring 2 that moves linearly under the winding and unwinding of the wire reel 21 is arranged in the valve body 1 and is used to push the sleeve 3 and the ejector pin 4 to move.

[0049] Specifically, the wire reels 21 are symmetrically arranged on both sides of the valve stem 131, and both wire reels 21 are fixedly sleeved on the output shaft of the motor 13, so that the wire reels 21 are not affected by the reduction gears, so that the wire reels 21 can have a greater stroke than the valve stem 131 to meet the requirement that the sleeve 3 can send the lower end of the thimble 4 to the exhaust port 11 position.

[0050] Furthermore, a pull rope is fixedly installed between the pressure ring 2 and the wire reel 21, and a spring is fixedly installed between the cavity in the valve body 1 for accommodating the sleeve 3 and the pressure ring 2. The spring is annularly arranged outside the pull rope; a slideway is provided in the cavity, and a plurality of sliders sliding in the slideway are fixedly installed on the sleeve 3, and a tension spring is fixedly installed between the slider and the slideway, and a slide rod passing through the slider is fixedly installed in the slideway. The tension spring is annularly arranged outside the slide rod. The purpose is to make the sleeve 3 be limited by the slide rod while being guided by the slider and the slideway during the movement process, so as to increase the stability of the linear movement of the sleeve 3. The installation methods of the slider, the slide rod and the tension spring are prior arts and will not be elaborated here.

[0051] When the motor 13 works, the pull rope is released, so that the pressure ring 2 pushes the sleeve 3 to slide linearly through the spring's restoration of deformation, and the tension spring on the sleeve 3 deforms accordingly. And before the pressure ring 2 pushes the upper end of the sleeve 3, it first pushes the upper end of the thimble 4. The purpose is to make the concave ends of the plurality of scraping boxes 33 move away from the valve stem 131 first, and then make the sleeve 3 move downward to the exhaust port 11, so as to ensure that no carbon deposits are scraped off during the downward movement of the sleeve 3 and guarantee the ventilation effect of the exhaust port 11.

[0052] As another embodiment further provided by the present invention, a notch 32 for the scraping box 33 to move is provided on the side wall of the sleeve 3, and a door panel 321 embedded in the scraping box 33 is hinged to the notch 32.

[0053] Specifically, the edge of the scraping box 33 is located in the gap between the side of the door panel 321 and the inner wall of the notch 32, and the gap where the thickness of the edge of the scraping box 33 is located can be ignored. The purpose is to make the door panel 321 provide interception for the inside of the scraping box 33 and provide closure for the notch 32.

[0054] During the upward reset movement of the sleeve 3, the scraping box 33 scrapes off the carbon deposits, and the carbon deposits are stored in the scraping box 33 and intercepted by the door panel 321, so that the scraped carbon deposits accumulate between the door panel 321 and the inner side of the scraping box 33, preventing the carbon deposits from falling downward and also providing a function of collecting the carbon deposits. Moreover, under the action of the scraping boxes 33 arranged in multiple layers in a circular pattern, the efficiency of scraping the carbon deposits on the valve stem 131 is improved, and the smoothness of the linear movement of the valve stem 131 is increased.

[0055] As still another embodiment further provided by the present invention, a push rod 333 is arranged at the rotating position of the scraping box 33, and a cross bar 43 is arranged between the two thimbles 4;

[0056] When the scraper head 341 contacts the inner end surface of the valve core 132 , the cross bar 43 restricts the elastic rod 34 from bending toward the axis of the sleeve 3 , and causes the scraper box 33 to slide in the opposite direction on the sleeve 3 , so that the push rod 333 pushes the door plate 321 to open the notch 32 .

[0057] Specifically, the push rod 333 is fixedly mounted on the shaft block 331, and the push rod 333 is in a "Z" shape, so that the push rod 333 can push the door panel 321 without interfering with the movement of the scraper box 33, making the movement of the scraper box 33 smoother and more stable, and also ensuring that the door panel 321 is opened by being touched, and a groove is opened on the side wall of the notch 32, and a first elastic member 332 is fixedly mounted in the groove, and a ring that slides in the groove is fixedly mounted on the end of the first elastic member 332, and the shaft block 331 rotates in the ring, and the first elastic member 332 is specifically a spring, and the assembly method of the shaft block 331 and the ring is the existing technology and will not be repeated here, so that the shaft block 331 can adapt to the rotation and movement of the scraper box 33.

[0058] Furthermore, since the valve stem 131 has a specific stroke when driven by the motor 13, the purpose is that the valve core 132 can change the amount of exhaust gas added to the exhaust port 11. This is existing technology and will not be described in detail here.

[0059] Furthermore, the lower end of the sleeve 3 is fixedly mounted with arc protrusions 31 corresponding to the number of elastic rods 34, and the arc protrusions 31 are provided with holes for the elastic rods 34 to move, so that the elastic rods 34 can drive the scraping head 341 to move more stably.

[0060] Furthermore, the elastic rod 34 is arc-shaped in a default state, with the top of the arc facing the axis of the sleeve 3, so that the elastic rod 34 can bend into the sleeve 3, that is, bend upward, when being bent by the extrusion force.

[0061] When the top of the scraper head 341 reaches the inner end surface of the valve core 132 and conflicts with it, the motor 13 stops working to make the sleeve 3 stay for a while, and because the upper end of the ejector pin 4 is pushed by the pressure ring 2 and flush with the upper end of the sleeve 3, the cross bar 43 conflicts with the top of the elastic rod 34 and causes the elastic rod 34 to bend downward, so that the elastic rod 34 after storing the force transfers the force to the first elastic member 332 and prompts the scraper box 33 to move upward, causing the push rod 333 to push the door panel 321 to deflect, and the door panel 3 21 and the inner side of the scraper box 33, and the airflow in the air inlet 12 enters between the upper and lower scraper boxes 33 from the gap, so that this part of the airflow blows the residual carbon deposits after the scraper box 33 is tilted upward, reducing the interference of the residual carbon deposits on the scraper box 33 in scraping the carbon deposits on the valve stem 131, improving the collection effect of the carbon deposits, and the airflow from the air inlet 12 entering the sleeve 3 from the gap at the edge of the scraper box 33 can transport the residual floating carbon deposits upward, which is used to assist in the collection of the residual carbon deposits.

[0062] As yet another embodiment further provided by the present invention, lower discharge holes 62 are arranged in a circumferential array around the exhaust gas port 11, and a triangular block 5 is hingedly arranged at the port of the lower discharge hole 62;

[0063] A convex strip 51 is arranged on the triangular block 5, and the convex strip 51 is slidably abutted by the ejector pin 4, causing the triangular block 5 to deflect to open the lower discharge hole 62.

[0064] Specifically, the convex strip 51 is inclined towards the axis of the exhaust gas port 11 in the default state, and high-temperature and corrosion-resistant rubber strips are fixedly installed on the side of the triangular block 5 and the convex strip 51 to make the rubber strips on the plurality of triangular blocks 5 abut against each other for sealing after deflection, and a torsion spring is arranged at the hinged position of the triangular block 5 to facilitate the reset of the triangular block 5 after losing power to close the lower discharge hole 62.

[0065] When the plurality of arc protrusions 31 reach the port of the exhaust gas port 11, the lower end of the ejector pin 4 slides and abuts on the inclined convex strip 51, causing the upper ends of the plurality of convex strips 51 to gradually come together, and promoting the triangular block 5 to rotate around the hinged position to open the lower discharge hole 62, facilitating the carbon deposits scraped off by the scraping head 341 to enter the lower discharge hole 62 for collection, and the reaction force generated by the convex strip 51 also causes the ejector pin 4 to move horizontally, so that the ejector pin 4 can move away from the axis of the sleeve 3 in the hole, facilitating the unlocking of the scraping box 33 by the ejector pin 4. When the scraping head 341 reaches the outer end face of the valve core 132, the plurality of scraping heads 341 are all above the gradually expanding convex strip 51, and during the process of scraping the carbon deposits on the outer end face of the valve core 132 by the scraping head 341, the gradually expanding convex strip 51 can also converge the upward blowing exhaust gas, so that the carbon deposits scraped off the valve core 132 can effectively enter the lower discharge hole 62 for collection, reducing the interference of the carbon deposits on the exhaust gas introduced into the exhaust gas port 11 and improving the intake and exhaust gas mixing effect.

[0066] As yet another embodiment further provided by the present invention, an upper discharge hole 61 is opened on the valve body 1, and in the reset state, the sleeve 3 causes the scraping box 33 to be deflected by abutment and communicated with the upper discharge hole 61.

[0067] Specifically, the widths of the door panel 321 and the scraping box 33 are both greater than the width of the upper discharge hole 61, so that when the sleeve 3 is received in the cavity of the valve body 1, the end of the scraping box 33 outside the sleeve 3 will not be stuck in the upper discharge hole 61, making the reception of the sleeve 3 more smooth.

[0068] By resetting and receiving the sleeve 3 in the cavity of the valve body 1, the ends of the plurality of scraping boxes 33 outside the sleeve 3 are deflected by the abutment of the cavity port, so that the inclination angle of the scraping box 33 increases again, and the scraping box 33 is in a dumping state to pour out the carbon deposits scraped inside, and along with the rotation of the push rod 333 to push the door panel 321 to completely open the notch 32, the carbon deposits in the scraping box 33 are poured obliquely downward into the upper discharge hole 61, thus completing the transfer of the carbon deposits collected in the scraping box 33 and avoiding the problem of new accumulation caused by the long-term stay of the carbon deposits in the sleeve 3.

[0069] As another embodiment further provided by the present invention, an annular cavity communicating with the upper row of holes 61 and the lower row of holes 62 is respectively formed on the valve body 1, and a pumping port 6 is provided on the cavity.

[0070] Specifically, the annular cavity above the valve body 1 is used to collect all the carbon deposits transferred from the upper row of holes 61, while the annular cavity below the valve body 1 is used to collect all the carbon deposits that fall and are collected from the lower row of holes 62. Both exhaust ports 6 are provided with pipes to extract the carbon deposits from the annular cavity, and the pipes are provided with air pumps to provide air extraction. The air pumps and their pipe connection methods are both existing technologies and will not be described in detail here.

[0071] By extracting the carbon deposits collected by the upper row holes 61 and the lower row holes 62 into the annular cavity, the problem of discharging the collected carbon deposits can be effectively solved, and the negative pressure generated by the exhaust can make up for the insufficient power of the lower row holes 62 to collect the carbon deposits, so that the carbon deposits scraped off the valve core 132 can be sucked in through the port of the lower row holes 62, effectively reducing the problem of carbon deposits accumulating at the exhaust port 11, and the suction force of the upper row holes 61 can effectively assist in dumping the carbon deposits collected by the scraper box 33, and the air inlet 12 is replenished with air flow to the upper and lower scraper boxes 33, so that in the process of the air flow blowing the residual carbon deposits upward, this part of the residual carbon deposits are also sucked into the upper row holes 61, thereby efficiently solving the problem of discharging the carbon deposits and making the valve body 1 cleaner.

[0072] As another embodiment further provided by the present invention, the scraper box 33 is deflected by the resistance so that the scraper head 341 is in resistance against the valve stem 131, and the cross bar 43 is reset away from the elastic rod 34, so that the elastic rod 34 is bent toward the axial direction of the sleeve 3, and pushes the ejector pin 4 to slide and cooperate with the scraper box 33 again.

[0073] Specifically, after the transverse movement, the ejector pin 4 causes the cross bar 43 to deviate from the arc top of the elastic rod 34, and causes the elastic rod 34 to bend downward and then reset itself, so that the elastic rod 34 can bend and deform upward due to its own curvature. If the scraper head 341 is bent by the inner end face of the valve core 132 and the scraper box 33 is rotated, and the rotation angle is smaller than the rotation angle of the scraper box 33 caused by the resistance of the port of the inner cavity of the valve body 1, the purpose is to make the upward bending amplitude of the elastic rod 34 greater than the downward bending amplitude.

[0074] When the sleeve 3 is received in the cavity of the valve body 1 and reaches the position of the scraper box 33 with the elastic rod 34, the scraper head 341 is driven to contact the valve stem 131. When the elastic rod 34 is still subjected to the extrusion force, the elastic rod 34 loses the resistance of the cross bar 43 and bends upward normally, and the upwardly bent elastic rod 34 pushes the cross bar 43 to move toward the axial direction of the sleeve 3, so that the protrusion 42 on the ejector pin 4 slides into the groove 334 again, making it convenient for the ejector pin 4 and the scraper box 33 to move repeatedly, thereby achieving the purpose of efficiently scraping off carbon deposits on the valve stem 131 and the valve core 132.

[0075] As another embodiment further provided by the present invention, the scraper box 33 slides in the notch 32 due to the deformation of the elastic rod 34 , and the end of the door panel 321 scrapes and cooperates with the inner wall of the scraper box 33 .

[0076] Through the stored force of the upward bending of the elastic rod 34, the scraper box 33 compresses the first elastic member 332 again, and the end of the door panel 321 actively slides in the upward scraper box 33, so that the inner side of the scraper box 33 is scraped by the door panel 321 to remove the residual accumulated carbon deposits in the scraper box 33, thereby improving the cleanliness of the bottom scraper box 33, ensuring the working efficiency of the scraper box 33 used for the final work of scraping carbon deposits, and making the cleaning of the valve stem 131 more efficient.

[0077] Working principle: When the motor 13 is working, the pull rope is released, so that the pressure ring 2 is deformed by the spring to push the sleeve 3 to slide in a straight line, and before the pressure ring 2 pushes the upper end of the sleeve 3, it first pushes the upper end of the ejector pin 4. At the same time, when the valve stem 131 drives the valve core 132 to open the exhaust port 11, the ejector pin 4 slides downward in the sleeve 3, so that the force of the protrusion 42 pushing the card slot 334 is downward, and the scraper box 33 is rotated around the shaft block 331, so that the concave end of the scraper box 33 is away from the valve stem 131, so that the downward moving sleeve 3 does not scrape off the carbon deposits. When the ejector pin 4 reaches the exhaust port 11, it is pushed outward along the axis of the sleeve 3, so that the protrusion 42 is released from the card slot The cam 341 is pressed against the piston 342 and the piston 332 is pressed against the piston 343, and the piston 332 is pressed against the piston 343. When the piston 332 is in the closed position, the piston 332 is pressed against the piston 343. When the piston 332 is in the closed position, the piston 332 is pressed against the piston 343.

[0078] 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. An electric EGR valve operation protection system, comprising a valve body provided with an exhaust gas port, an intake port and a motor, wherein a valve rod driven by the motor to move linearly is arranged in the valve body, and a valve core is arranged at the end of the valve rod, and is characterized in that, It further includes a sleeve that moves in the opposite direction to the valve stem, and scraping boxes are rotatably arranged on the side wall of the sleeve at equal intervals; On the sleeve, there are ejector pins that slide axially and are symmetrically arranged about the center of the scraping box, and the ejector pins are in sliding fit with the scraping box through the bumps provided thereon; An elastic rod is fixedly arranged on the scraping box, and a scraping head is arranged at the end of the elastic rod; Among them, after the two ejector pins move to the exhaust port, they move away from the axis of the sleeve to release the sliding fit with the scraping box, so that the scraping box resets to contact the side wall of the valve stem. At the same time, after the valve core is inserted into and fits with the scraping head, the vertex of the scraping head abuts against the outer end face of the valve core; It further includes a wire reel driven by a motor. In the valve body, there is a pressure ring that moves linearly by the winding and unwinding of the wire reel and is used to push the sleeve and the ejector pins to move; A notch for the movement of the scraping box is provided on the side wall of the sleeve, and a door plate embedded in the scraping box is hinged to the notch; A push rod is arranged at the rotation position of the scraping box, and a cross bar is arranged between the two ejector pins; When the scraping head abuts against the inner end face of the valve core, the cross bar restricts the elastic rod from bending in the direction close to the axis of the sleeve, and makes the scraping box slide in the opposite direction on the sleeve, so that the push rod pushes the door plate to open the notch.

2. The operation protection system of an electric EGR valve according to claim 1, wherein A plurality of second elastic members are hinged between the ejector pin and the sleeve.

3. The operation protection system of an electric EGR valve according to claim 1, characterized in that, The exhaust port is arranged in a circumferential array of lower discharge holes, and triangular blocks are hinged to the ports of the lower discharge holes; A convex strip is arranged on the triangular block, and the convex strip is slidably abutted by the ejector pin to deflect the triangular block to open the lower discharge hole.

4. An electric EGR valve operation protection system according to claim 3, characterized in that, An upper discharge hole is provided on the valve body. In the reset state, the sleeve deflects the scraping box by abutting and communicates with the upper discharge hole.

5. An electric EGR valve operation protection system according to claim 4, characterized in that, Annular cavities communicating with the upper discharge hole and the lower discharge hole are respectively provided on the valve body, and a suction and discharge port is provided on the cavity.

6. The operation protection system of an electric EGR valve according to claim 1, characterized in that The scraping box is deflected by abutting to make the scraping head abut against the valve stem, and the cross bar resets away from the elastic rod, so that the elastic rod bends in the direction close to the axis of the sleeve and pushes the ejector pin to slide and fit with the scraping box again.

7. An electric EGR valve operation protection system according to claim 1, characterized in that, The scraping box slides in the notch due to the deformation of the elastic rod, and the end of the door plate is in scraping fit with the inner wall of the scraping box.

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