An EGR valve with adjustable output volume

Abstract

This utility model relates to the field of automotive parts technology, and in particular to an EGR valve with adjustable output volume. It includes a valve seat, a bushing, and a valve stem. A sleeve is fitted onto the valve stem, and a piston is housed inside the sleeve. A first compression spring is provided between the inner wall of the sleeve and the piston. A coil assembly is provided between the outer wall of the sleeve and the inner wall of the valve body. A sensor assembly is provided on one side of the valve body. A support block is provided at the bottom of the valve body, with the bottom of the support block abutting against the top of the valve seat. An exhaust chamber is provided between the bushing and the support block. An air inlet is provided at the bottom of the valve seat. A tapered portion is provided at one end of the valve stem near the bushing. A tapered hole is provided at the axial center of the bushing. An annular retaining ring is provided above the tapered portion and the tapered hole on the valve stem. This utility model improves upon existing technology by enabling flexible fine-tuning of the output volume after the EGR valve is opened through the cooperation of the tapered portion and the annular retaining ring on the valve stem and the tapered hole on the bushing. This eliminates the need to close the valve again, shortens the adjustment stroke, and improves control flexibility.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, and in particular to an EGR valve with adjustable air output. Background Technology

[0002] An EGR valve, also known as an exhaust gas recirculation valve, is an electromechanical product installed on gasoline engines to control the amount of exhaust gas recirculated back to the intake system. Traditional EGR valves mostly employ a mechanical design, driven by a vacuum or stepper motor. This design is simple in structure and low in cost, but its response speed is slow, making it difficult to meet the precise control requirements of modern engines.

[0003] With the development of electronic technology, electronically controlled EGR valves have gradually replaced traditional mechanical EGR valves. Electronically controlled EGR valves receive sensor signals through an electronic control unit (ECU) and adjust the valve opening in real time to achieve more precise control. This design has the advantages of fast response and high control accuracy. For example, Chinese utility model patent CN202867029U discloses an EGR valve in which a coil assembly connected to the vehicle's ECU is installed within the valve body. Under the action of the ECU, the coil assembly generates electromagnetic force, driving the valve stem and piston to move axially downward within the valve body, thus opening the valve. Simultaneously, the guide rod and permanent magnet in the sensor cavity move axially with the piston, causing a change in the magnetic induction intensity within the sensor cavity. The sensor chip senses this change and feeds it back to the ECU. The ECU then combines this information with the overall vehicle operating conditions to adjust the EGR valve in real time, completing closed-loop control of the EGR valve and achieving precise adjustment of the valve opening. However, the air output after the valve stem moves downward to open the valve is basically linear, and the air output cannot be finely adjusted again. The only option is to close the valve again. The stroke is relatively long and the flexibility is not high.

[0004] Therefore, it is necessary to improve upon the shortcomings of the existing technologies mentioned above. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide an EGR valve with adjustable air output in order to address the shortcomings of the prior art, thereby solving the problems of difficulty in fine-tuning the air output after the EGR valve is opened, long stroke and low flexibility.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an EGR valve with adjustable output volume, comprising a valve seat, a bushing installed within the valve seat, a valve body connected to the valve seat, and a valve stem with one end capable of abutting against the bushing. The valve stem extends into the valve body cavity and is fitted with a sleeve. A piston fixedly connected to the valve stem is disposed within the sleeve. A first compression spring fitted onto the valve stem is provided between the inner wall of the sleeve and the piston. A coil assembly is provided between the outer wall of the sleeve and the inner wall of the valve body. A sensor assembly is provided on the side of the valve body away from the valve seat. A support block fitted onto the valve stem is provided at the bottom of the valve body. The bottom of the block abuts against the top of the valve seat. A waste gas chamber is provided between the bushing and the support block. The bottom of the valve seat is provided with an air inlet connected to the waste gas chamber. The valve stem is provided with a tapered part with a larger end diameter near the bushing. A tapered hole connected to the waste gas chamber is provided at the axial center of the bushing. The diameter of the tapered hole is larger at the end near the valve body than at the other end. An annular retaining ring is provided above the tapered part and the tapered hole on the valve stem. The tapered part cooperates with the lower port of the tapered hole to realize the opening and closing of the valve. The annular retaining ring cooperates with the upper port of the tapered hole to realize the fine adjustment of the air output after the valve is opened.

[0007] By adopting the above technical solution, and by setting a conical part, a conical hole, and an annular retaining ring, when the valve is opened, the conical part of the valve stem no longer abuts against the narrow opening of the conical hole of the bushing, and the exhaust gas can flow out from the exhaust gas chamber through the gap between the conical part and the conical surface of the conical hole. Subsequently, if it is necessary to fine-tune the amount of gas output, the size of the outlet can be limited by controlling the up and down movement of the valve stem and adjusting the gap between the annular retaining ring and the conical surface of the conical hole, thereby achieving the adjustment of the amount of gas output. The overall structure enables flexible adjustment of the amount of gas output during the valve opening process, and fine-tuning can be performed without closing the valve again, shortening the adjustment stroke and improving flexibility.

[0008] A further provision of the above technical solution is that a flow guide is installed between the support block and the valve seat, and the flow guide is tapered with a smaller diameter at one end near the annular retaining ring and a larger diameter at the other end.

[0009] By adopting the above technical solution, the conical design of the guide component can guide the exhaust gas entering the exhaust chamber, allowing the exhaust gas to flow more smoothly to the conical hole of the bushing, reducing the impact of airflow turbulence on the regulation of the exhaust volume, and improving the stability of the regulation.

[0010] A further provision of the above technical solution is as follows: a baffle is provided at the bottom of the valve body, a fixing seat and a pressure plate for fixing the coil assembly are provided inside the valve body, the pressure plate is mounted on the baffle, a wave spring is provided on the outer periphery of the pressure plate, and the two axial ends of the wave spring abut against the coil assembly and the baffle respectively.

[0011] Using the above technical solution, the mounting base and pressure plate can securely fix the coil assembly in the valve body, and the wave spring can buffer and pre-tighten the coil assembly, reducing the vibration of the coil assembly during operation and ensuring its working stability.

[0012] A further configuration of the above technical solution is as follows: the piston has a first retaining ring and a second retaining ring on both sides of the middle part, which are sleeved on the valve stem. The valve stem has a first retaining groove and a second retaining groove that are adapted to the first retaining ring and the second retaining ring. The first retaining ring can abut against the first compression spring. The second retaining ring is a plum blossom retaining ring. The piston is axially secured to the valve stem by the first retaining ring and the second retaining ring.

[0013] By adopting the above technical solution, the first and second retaining rings cooperate with the corresponding retaining grooves to securely and axially lock the piston onto the valve stem, preventing axial displacement of the piston during movement and ensuring synchronous movement of the piston and valve stem. The design of the plum blossom retaining rings can improve the stability of the connection and facilitate installation and disassembly.

[0014] A further configuration of the above technical solution is as follows: the sensor assembly includes a sensor cavity, a guide rod with one end connected to the valve stem and the other end extending into the sensor cavity and slidably connected, and a second compression spring disposed on the guide rod and abutting against the inner wall of the sensor cavity. A permanent magnet is disposed inside the guide rod, and a sensing chip opposite to the permanent magnet is disposed on the inner wall of the sensor cavity.

[0015] Using the above technical solution, when the valve stem moves, the guide rod moves with it, and the relative position between the permanent magnet and the sensing chip changes, causing a change in the magnetic induction intensity. The sensing chip feeds this change back to the ECU, realizing real-time monitoring of the valve stem position, which facilitates precise control by the ECU. The second compression spring can provide a restoring force for the guide rod, ensuring the smoothness of the guide rod's movement.

[0016] A further configuration of the above technical solution is as follows: a first slider is provided on one side of the guide rod, a first groove is provided on the inner wall of the sensor cavity, and the sensing chip is installed on the side of the inner wall of the sensor cavity away from the first slider.

[0017] By adopting the above technical solution, the first slider cooperates with the first groove to guide the movement of the guide rod, ensuring that the guide rod moves in a straight line and avoiding its deviation, thus ensuring the accuracy of the relative position between the permanent magnet and the sensing chip and improving the accuracy of sensor monitoring.

[0018] A further provision of the above technical solution is as follows: the guide rod is provided with second sliders on both sides adjacent to the first slider, the inner wall of the sensor cavity is provided with a second sliding groove adapted to the second slider, and the second compression spring is installed in the second sliding groove with one end abutting against the second slider and the other end abutting against the bottom wall of the sensor cavity.

[0019] By adopting the above technical solution, the second slider cooperates with the second slide groove to further enhance the guiding effect on the movement of the guide rod, making the movement of the guide rod more stable. The second compression spring is installed in the second slide groove, which can better apply the restoring force to the guide rod and is installed firmly to ensure the stable performance of its function.

[0020] The beneficial effects achieved by this utility model are: through the cooperation of the tapered part on the valve stem, the annular retaining ring, and the tapered hole on the bushing, the output gas volume of the EGR valve can be flexibly and finely adjusted after it is opened, without having to close the valve again, thus shortening the adjustment stroke and improving the flexibility of control. Attached Figure Description

[0021] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model;

[0022] Figure 2 This is a top view of an embodiment of the present utility model;

[0023] Figure 3 yes Figure 2 Cross-sectional view of plane AA;

[0024] Figure 4 yes Figure 2 Cross-sectional view of the middle BB surface;

[0025] Figure 5 This is a schematic diagram of the valve stem in an embodiment of this utility model.

[0026] The markings in the diagram are: 1. Valve seat; 2. Bushing; 3. Valve body; 4. Valve stem; 5. Sleeve; 6. Piston; 7. First compression spring; 8. Coil assembly; 9. Sensor assembly; 10. Support block; 11. Exhaust chamber; 12. Air inlet; 13. Conical part; 14. Conical hole; 15. Annular retaining ring; 16. Guide component; 17. Baffle; 18. Fixing seat; 19. Pressure plate; 20. Wave spring; 21. First retaining ring; 22. Second retaining ring; 23. First retaining groove; 24. Second retaining groove; 25. Sensor cavity; 26. Guide rod; 27. Second compression spring; 28. Permanent magnet; 29. ​​Sensor chip; 30. First slider; 31. First slide groove; 32. Second slider; 33. Second slide groove. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] like Figure 1-5As shown, an EGR valve with adjustable output includes a valve seat 1, a bushing 2 installed inside the valve seat 1, a valve body 3 connected to the valve seat 1, and a valve stem 4 with one end capable of abutting against the bushing 2. The valve stem 4 extends into the cavity of the valve body 3 and is fitted with a sleeve 5. A piston 6 fixedly connected to the valve stem 4 is disposed inside the sleeve 5. A first compression spring 7 fitted onto the valve stem 4 is provided between the inner wall of the sleeve 5 and the piston 6. A coil assembly 8 is provided between the outer wall of the sleeve 5 and the inner wall of the valve body 3. A sensor assembly 9 is provided on the side of the valve body 3 away from the valve seat 1. A sensor assembly 9 is provided at the bottom of the valve body 3. A support block 10 is fitted onto the valve stem 4. The bottom of the support block 10 abuts against the top of the valve seat 1. An exhaust chamber 11 is provided between the bushing 2 and the support block 10. An air inlet 12 connected to the exhaust chamber 11 is provided at the bottom of the valve seat 1. A tapered part 13 with a larger end diameter is provided at one end of the valve stem 4 near the bushing 2. A tapered hole 14 connected to the exhaust chamber 11 is provided at the axial center of the bushing 2. The diameter of the tapered hole 14 at one end near the valve body 3 is larger than that at the other end. An annular retaining ring 15 is provided above the tapered part 13 and the tapered hole 14 on the valve stem 4.

[0029] like Figure 3 , 4 As shown, a guide 16 is installed between the support block 10 and the valve seat 1, and is sleeved on the valve stem 4. The guide 16 is tapered with a smaller diameter at one end near the annular retaining ring 15 and a larger diameter at the other end.

[0030] like Figure 3 , 4 As shown, the bottom of the valve body 3 is provided with a baffle 17, and the valve body 3 is provided with a fixing seat 18 and a pressure plate 19 for fixing the coil assembly 8. The pressure plate 19 is installed on the baffle 17, and a wave spring 20 is provided on the outer periphery of the pressure plate 19. The two axial ends of the wave spring 20 abut against the coil assembly 8 and the baffle 17 respectively.

[0031] like Figure 3-5 As shown, the piston 6 has a first retaining ring 21 and a second retaining ring 22 on both sides of the middle part, which are sleeved on the valve stem 4. The valve stem 4 has a first retaining groove 23 and a second retaining groove 24 that are adapted to the first retaining ring 21 and the second retaining ring 22. The first retaining ring 21 can abut against the first compression spring 7. The second retaining ring 22 is a plum blossom retaining ring. The piston 6 is axially fixed on the valve stem 4 by the first retaining ring 21 and the second retaining ring 22.

[0032] like Figure 3 , 4 As shown, the sensor assembly 9 includes a sensor cavity 25, a guide rod 26 with one end connected to the valve stem 4 and the other end extending into the sensor cavity 25 and slidably connected, and a second compression spring 27 disposed on the guide rod 26 and abutting against the inner wall of the sensor cavity 25. A permanent magnet 28 is disposed inside the guide rod 26, and a sensing chip 29 opposite to the permanent magnet 28 is disposed on the inner wall of the sensor cavity 25.

[0033] like Figure 3 As shown, a first slider 30 is provided on one side of the guide rod 26, a first groove 31 is provided on the inner wall of the sensor cavity 25, and the sensor chip 29 is installed on the side of the inner wall of the sensor cavity 25 away from the first slider 30.

[0034] like Figure 4 As shown, the guide rod 26 is provided with second sliders 32 on both sides adjacent to the first slider 30. The inner wall of the sensor cavity 25 is provided with a second groove 33 that is adapted to the second slider 32. The second compression spring 27 is installed in the second groove 33 and one end abuts against the second slider 32, and the other end abuts against the bottom wall of the sensor cavity 25.

[0035] In the above embodiment, when it is necessary to adjust the gas output, the ECU controls the coil assembly 8 to work. The coil assembly 8 generates an electromagnetic force to attract or repel the permanent magnet 28, driving the guide rod 26 to move the valve stem 4 and the piston 6. The tapered part 13 of the valve stem 4 no longer abuts against the narrow opening of the tapered hole 14 of the bushing. The exhaust gas can flow out from the exhaust chamber 11 through the gap between the tapered part 13 and the tapered surface of the tapered hole 14. After the valve is opened, the ECU controls the current of the coil assembly 8 to control the up and down movement of the valve stem 4. The size of the gap between the annular retaining ring 15 and the tapered surface of the tapered hole 14 is adjusted to limit the size of the gas outlet, thereby realizing the adjustment of the gas output. The overall structure can realize flexible adjustment of the gas output during the valve opening process. Fine adjustment can be made without closing the valve again, shortening the adjustment stroke and improving flexibility.

Claims

1. An EGR valve with adjustable output volume, comprising a valve seat, a bushing installed within the valve seat, a valve body connected to the valve seat, and a valve stem with one end capable of abutting against the bushing. The valve stem extends into the valve body cavity and is fitted with a sleeve. A piston fixedly connected to the valve stem is disposed within the sleeve. A first compression spring fitted onto the valve stem is provided between the inner wall of the sleeve and the piston. A coil assembly is provided between the outer wall of the sleeve and the inner wall of the valve body. A sensor assembly is provided on the side of the valve body away from the valve seat. A support block fitted onto the valve stem is provided at the bottom of the valve body, and the bottom of the support block abuts against the top of the valve seat. The valve body is characterized by: An exhaust chamber is provided between the bushing and the support block. An air inlet connected to the exhaust chamber is provided at the bottom of the valve seat. A tapered portion with a larger end diameter is provided at one end of the valve stem near the bushing. A tapered hole connected to the exhaust chamber is provided at the axial center of the bushing. The diameter of the tapered hole at one end near the valve body is larger than that at the other end. An annular retaining ring is provided above the tapered portion and the tapered hole on the valve stem. The tapered portion cooperates with the lower port of the tapered hole to realize the opening and closing of the valve. The annular retaining ring cooperates with the upper port of the tapered hole to realize the fine adjustment of the air output after the valve is opened.

2. The EGR valve with adjustable output volume according to claim 1, characterized in that: A flow guide is installed between the support block and the valve seat, and the flow guide is tapered with a smaller diameter at one end near the annular retaining ring and a larger diameter at the other end.

3. The EGR valve with adjustable output volume according to claim 2, characterized in that: The valve body has a baffle at the bottom and a fixing seat and a pressure plate for fixing the coil assembly inside the valve body. The pressure plate is mounted on the baffle and a wave spring is provided on the outer periphery of the pressure plate. The two axial ends of the wave spring abut against the coil assembly and the baffle respectively.

4. The EGR valve with adjustable output volume according to claim 3, characterized in that: The piston has a first retaining ring and a second retaining ring on both sides of its middle section, which are fitted onto the valve stem. The valve stem has a first retaining groove and a second retaining groove that are adapted to the first retaining ring and the second retaining ring, respectively. The first retaining ring can abut against the first compression spring. The second retaining ring is a plum blossom retaining ring. The piston is axially secured to the valve stem by the first retaining ring and the second retaining ring.

5. An EGR valve with adjustable output volume according to any one of claims 1-4, characterized in that: The sensor assembly includes a sensor cavity, a guide rod with one end connected to a valve stem and the other end extending into the sensor cavity and slidably connected, and a second compression spring disposed on the guide rod and abutting against the inner wall of the sensor cavity. A permanent magnet is disposed inside the guide rod, and a sensing chip opposite to the permanent magnet is disposed on the inner wall of the sensor cavity.

6. The EGR valve with adjustable output volume according to claim 5, characterized in that: The guide rod has a first slider on one side, the sensor cavity has a first groove on the inner wall, and the sensor chip is installed on the inner wall of the sensor cavity away from the first slider.

7. An EGR valve with adjustable output volume according to claim 6, characterized in that: The guide rod is provided with second sliders on both sides adjacent to the first slider. The inner wall of the sensor cavity is provided with a second sliding groove adapted to the second slider. The second compression spring is installed in the second sliding groove, with one end abutting against the second slider and the other end abutting against the bottom wall of the sensor cavity.

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