A stuck-open exhaust gas recirculation valve assembly

Abstract

The utility model discloses a kind of anti-jamming exhaust gas recirculation valve assembly belonging to valve technical field, including valve seat, valve cover, valve stem, driving mechanism, transmission mechanism, sealing disc, valve seat is equipped with drive channel, transmission mechanism is connected with valve stem, one end of valve stem is linked with driving mechanism through transmission mechanism, the other end passes through drive channel and is connected with sealing disc, drive channel is equipped with guide sleeve, sealing element on the outer periphery of valve stem, drive channel is equipped with the exhaust hole for exhaust gas discharge at sealing element, sealing element is equipped with several groups of exhaust passage, when exhaust gas occurs slight leakage, exhaust gas first enters the exhaust passage at sealing element, subsequently exhausts outside valve body through the exhaust hole opened on drive channel, effectively prevent exhaust gas accumulation at sealing element end portion Formed carbon deposit, avoid the valve jamming caused by carbon deposit accumulation, reduce the corrosion effect of exhaust gas to guide sleeve and valve stem, thereby reduce the risk of seal effect deterioration caused by gap increase.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to an anti-jamming waste gas recirculation valve assembly. Background Technology

[0002] Exhaust gas recirculation (EGR) is one of the most important components in modern car engines. It is a NOx emission control technology widely used in various diesel and gasoline engines, and can effectively reduce NOx emissions.

[0003] Chinese utility model patent CN206722932U discloses a dual-plate electric EGR valve, including a valve body and a valve stem located within the valve body. A transmission mechanism is provided between the valve stem and the valve body. One end of the valve stem is provided with a valve plate, and the other end of the valve stem is connected to a reduction mechanism via a sliding cam. The reduction mechanism is driven by a motor. The sliding cam is provided with a magnet and a non-contact displacement sensor that cooperates with the magnet. The non-contact displacement sensor senses the position change of the magnet, thereby directly obtaining the linear displacement of the valve stem and outputting an analog signal to the ECU. The ECU supplies power to the motor through the power supply circuit board based on the feedback signal, realizing precise control of the circulation valve by the ECU.

[0004] However, during the exhaust gas recirculation process, some exhaust gas will corrode the inner wall of the valve body and the guide sleeve through the gap between the guide sleeve and the valve body and valve stem. In addition, some leaked exhaust gas will remain between the end of the guide sleeve and the seal to accumulate carbon deposits, causing the valve to jam. Furthermore, as the amount of residual exhaust gas increases, the amount of carbon deposits gradually increases, which will continuously wear the valve stem and guide sleeve, causing the gap between them to gradually increase. The sealing effect will deteriorate rapidly, leading to uncontrolled exhaust gas leakage. Utility Model Content

[0005] The purpose of this invention is to provide an anti-jamming exhaust gas recirculation valve assembly that prevents exhaust gas corrosion and has a long service life, in order to solve the above-mentioned problems existing in the prior art.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is: an anti-jamming waste gas recirculation valve assembly, including a valve seat, a valve cover, a valve stem, a drive mechanism, a transmission mechanism, and a sealing disc. The valve seat is provided with a drive channel, and the transmission mechanism is connected to the valve stem. One end of the valve stem is linked to the drive mechanism through the transmission mechanism, and the other end passes through the drive channel and is connected to the sealing disc. The characteristic feature is that: a guide sleeve and a sealing element are provided around the valve stem in the drive channel, and an exhaust hole for waste gas discharge is opened at the sealing element in the drive channel. The sealing element is provided with several sets of exhaust channels, and the exhaust channels are connected to the exhaust holes. If a small leak of waste gas occurs, it can be discharged from the exhaust holes through the exhaust channels.

[0007] By adopting the above technical solution: the valve stem passes through the guide sleeve in the drive channel and connects to the sealing disc. The guide sleeve provides radial support and guidance for the valve stem. The sealing element is sleeved on the outer periphery of the valve stem to seal the drive channel. When a small leak of exhaust gas occurs, the exhaust gas first enters the exhaust channel at the sealing element, and then exits to the outside of the valve seat through the exhaust hole opened on the drive channel. This effectively prevents the exhaust gas from accumulating at the end of the sealing element and forming carbon deposits, avoiding valve jamming caused by carbon deposit accumulation. At the same time, the matching design of the exhaust channel and the exhaust hole allows the leaked exhaust gas to be discharged in time, reducing the corrosive effect of exhaust gas on the guide sleeve and valve stem, thereby reducing the risk of deterioration of the sealing effect due to increased gap. In addition, the guide sleeve is made of graphite material, and the gap between its inner wall and the valve stem is smaller than that of the traditional metal guide sleeve, reducing the amount of exhaust gas entering. At the same time, the valve stem guidance is more precise and can automatically lubricate the valve stem during the extension and retraction process, reducing the risk of jamming of the exhaust gas recirculation valve and improving the smoothness of valve stem extension and retraction.

[0008] The aforementioned anti-jamming exhaust gas recirculation valve assembly can be further configured such that: the sealing element includes a sealing seat, a first oil seal, and a second oil seal, and the sealing seat has receiving grooves at both ends for accommodating the first oil seal and the second oil seal, and a sealing boss is formed between the two sets of receiving grooves, and the exhaust passage is opened at the sealing boss.

[0009] By adopting the above technical solution: the receiving grooves opened at both ends of the sealing seat respectively accommodate the first oil seal and the second oil seal, and the two sets of oil seals form a double sealing structure. When the first oil seal leaks a little, the second oil seal can act as a supplementary sealing layer to prevent exhaust gas from further seeping in. The exhaust channel opened at the sealing boss in the middle of the sealing seat connects the area between the two sets of oil seals with the outside, so that the exhaust gas leaking between the two sets of oil seals can be discharged in time, reducing the residence time of exhaust gas inside the seal and the probability of carbon deposit formation, thereby improving the reliability and service life of the sealing system.

[0010] The aforementioned anti-jamming exhaust gas recirculation valve assembly can be further configured such that: an exhaust ring groove is provided on the outer periphery of the sealing seat, and the exhaust passage is connected to the exhaust ring groove.

[0011] By adopting the above technical solution, the exhaust ring groove opened on the outer periphery of the sealing seat connects all exhaust channels to form an annular exhaust circuit, allowing exhaust gas to enter from any exhaust channel, be evenly distributed through the exhaust ring groove, and be discharged from the exhaust hole. This avoids exhaust failure caused by blockage of a single exhaust channel. At the same time, the exhaust ring groove increases the flow path length of exhaust gas on the outer periphery of the sealing seat, which helps to further cool and depressurize the exhaust gas before discharge, reducing the corrosive effect on the sealing seat material, thereby improving the redundancy of the exhaust system and the durability of the sealing components.

[0012] The aforementioned anti-jamming waste gas recirculation valve assembly can be further configured as follows: the transmission mechanism includes a transmission bracket, several sets of return springs, and a transmission bearing. The transmission bracket is provided with several sets of positioning bosses. One end of the return spring is sleeved on the positioning boss, and the other end abuts against the inner wall of the valve seat. The transmission bracket is provided with two sets of connecting bosses at intervals. A connecting pin is provided between the two sets of connecting bosses. The transmission bearing is installed on the connecting pin. The transmission bracket is linked with the drive mechanism through the transmission bearing. The operation of the drive mechanism pushes the valve stem to extend through the transmission bearing. The return spring is used to retract the valve stem.

[0013] By adopting the above technical solution: the transmission bracket positions the return spring through the positioning boss. One end of the return spring is sleeved on the positioning boss, and the other end abuts against the inner wall of the valve seat, providing a continuous contraction and return force for the valve stem. A transmission bearing is installed on the connecting pin between the two sets of connecting bosses. The drive mechanism drives the transmission bracket to move by pushing the transmission bearing, thereby driving the valve stem to extend. The rotational motion of the drive mechanism is converted into the linear motion of the transmission bracket through the transmission bearing, reducing frictional resistance and wear during the movement. At the same time, the distributed arrangement of the return springs makes the transmission bracket evenly stressed, avoiding valve stem jamming caused by uneven load.

[0014] The aforementioned anti-jamming exhaust gas recirculation valve assembly can be further configured as follows: a sensing support plate extends outward from the transmission bracket, a displacement sensor is provided inside the valve seat, a magnet is connected to the sensing support plate, the magnet is T-shaped, and the magnet is injection molded to the sensing support plate.

[0015] By adopting the above technical solution: a T-shaped magnet is connected to the sensing support plate extending outward from the transmission bracket. The magnet and the sensing support plate are fixedly connected by injection molding. The T-shaped structure increases the contact area and interlocking force between the magnet and the injection molding material, effectively preventing the magnet from coming off due to vibration or temperature changes during use. The displacement sensor installed in the valve seat monitors the valve stem displacement in real time by sensing the position change of the T-shaped magnet and feeds the signal back to the ECU. This improves the reliability of the magnet connection while ensuring the accuracy of the position feedback, reducing the risk of signal distortion and valve control failure caused by magnet loosening.

[0016] The aforementioned anti-jamming exhaust gas recirculation valve assembly can be further configured as follows: the drive mechanism includes a drive motor and a transmission gear, the transmission gear includes a gear part and a cam part, the output end of the drive motor is connected to the drive gear, the gear part meshes with the drive gear, the cam part abuts against the transmission bearing, the drive motor runs and drives the transmission gear to rotate circumferentially, causing the cam part to rotate and drive the transmission bearing to rotate circumferentially and push the transmission bracket to move.

[0017] By adopting the above technical solution: when the drive motor is running, it drives the drive gear at the output end to rotate. The drive gear meshes with the gear part of the transmission gear to transmit power to the cam part. During the rotation, the cam part abuts against the transmission bearing and pushes the transmission bearing to move circumferentially along the cam profile, thereby driving the transmission bracket and valve stem to achieve linear extension action. This allows the extension speed and stroke of the valve stem to be precisely controlled according to the cam profile curve. At the same time, the multi-stage reduction structure between the drive motor and the transmission gear increases the output torque, ensuring the reliable opening and closing of the valve under the action of exhaust gas pressure.

[0018] The beneficial effects of this utility model are as follows:

[0019] First, by directly integrating the vent hole into the seal mounting position within the drive channel, and by setting a guide structure on the seal body that connects to its internal vent channel, the seal and vent hole form an integrated exhaust gas discharge path. When a minor leak occurs, the leaking gas first enters the vent channel within the seal, and then quickly exits from the adjacent vent hole to the outside of the valve seat. This effectively prevents exhaust gas from accumulating at the end of the seal and forming carbon deposits, thus eliminating the valve jamming problem caused by carbon buildup at its source. Simultaneously, it simplifies the internal machining and assembly processes of the valve seat and allows leaked exhaust gas to be discharged promptly, reducing the corrosive effect of exhaust gas on the guide sleeve and valve stem. Therefore, while ensuring sealing reliability, it improves the smoothness of operation and anti-jamming capability of the exhaust gas recirculation valve during long-term use.

[0020] Secondly, in the transmission mechanism, the transmission bracket uses positioning bosses to distribute the return springs. One end of the return spring is fitted onto the positioning boss, and the other end abuts against the inner wall of the valve seat, providing a continuous contraction and return force to the valve stem and ensuring uniform force distribution on the transmission bracket, thus preventing valve stem jamming due to uneven load. A transmission bearing is installed on the connecting pin between the two sets of connecting bosses. The drive mechanism uses a cam to push the transmission bearing, moving the transmission bracket and converting rotational motion into linear motion, reducing frictional resistance and wear during operation. T-shaped magnets are connected to the outward-extending sensing plate of the transmission bracket via injection molding. The T-shaped structure increases the contact area and engagement force between the magnet and the injection molding material, effectively preventing the magnet from coming loose due to vibration or temperature changes. Combined with the displacement sensor inside the valve seat, this monitors the valve stem displacement in real time and feeds it back to the ECU. This improves the reliability of the magnet connection while ensuring the accuracy of the position feedback, reducing the risk of signal distortion and valve control failure caused by magnet loosening. Therefore, the overall exhaust gas recirculation valve assembly achieves high reliability, long lifespan, and precise control.

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0022] Figure 1This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the overall structure of this utility model from another perspective;

[0024] Figure 3 This is a schematic diagram of the valve seat of this utility model.

[0025] Figure 4 This is a schematic diagram of the combination of the drive mechanism, transmission mechanism, valve stem, and seal of this utility model;

[0026] Figure 5 This is a schematic diagram of the transmission gear of this utility model;

[0027] Figure 6 This is a schematic diagram of the transmission bracket of this utility model;

[0028] Figure 7 This is a schematic diagram of the structure of the magnet of this utility model;

[0029] Figure 8 This is a schematic diagram of the sealing element of this utility model;

[0030] Figure 9 This is a cross-sectional schematic diagram of the sealing element of this utility model;

[0031] Label annotations: Valve seat 1, Drive channel 11, Guide sleeve 12, Exhaust port 13, Receiving cavity 14, Protective sleeve 15, Third oil seal 16, Valve cover 2, Valve stem 3, Drive mechanism 4, Drive motor 41, Transmission gear 42, Gear part 421, Cam part 422, Drive gear 43, Transmission mechanism 5, Transmission bracket 51, Positioning boss 511, Connecting pin 512, Sensing support plate 513, Return spring 52, Transmission bearing 53, Magnet 54, Sealing disc 6, Seal 7, Exhaust channel 71, Sealing cavity 721, Sealing seat 72, First oil seal 73, Second oil seal 74, Sealing boss 75, Exhaust ring groove 76, Positioning disc 8. Detailed Implementation

[0032] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0033] An anti-jamming exhaust gas recirculation valve assembly, such as Figures 1 to 9As shown, the valve includes a valve seat 1, a valve cover 2, a valve stem 3, a drive mechanism 4, a transmission mechanism 5, and a sealing disc 6. The valve seat 1 is provided with a drive channel 11. The transmission mechanism 5 is connected to the valve stem 3. One end of the valve stem 3 is linked to the drive mechanism 4 through the transmission mechanism 5, and the other end passes through the drive channel 11 and is connected to the sealing disc 6. The drive channel 11 is fitted with a guide sleeve 12 and a sealing element 7 around the valve stem 3. The drive channel 11 has an exhaust hole 13 for exhausting waste gas at the sealing element 7. The sealing element 7 is provided with several sets of exhaust channels 71. The exhaust channels 71 are connected to the exhaust holes 13. If a small leak of waste gas occurs, it can be discharged from the exhaust holes 13 through the exhaust channels 71.

[0034] like Figure 3 , Figure 4 As shown, the valve seat 1 has a receiving cavity 14, and the valve cover 2 can close the receiving cavity 14 to form a sealed inner cavity. The drive mechanism 4 and the transmission mechanism 5 are located in the receiving cavity 14.

[0035] The valve seat 1 is also provided with a positioning disc 8 at the exhaust gas circulation pipe for sealing and positioning of the sealing disc 6. The positioning disc 8 is snapped into the valve seat 1.

[0036] The valve seat 1 is provided with a protective sleeve 15 and a third oil seal 16 at one end of the drive channel 11 relative to the transmission mechanism 5. The protective sleeve 15 is sleeved on the valve stem 3 and snapped into the end of the drive channel 11. The third oil seal 16 is located on the side of the protective sleeve 15 close to the drive channel 11. The valve stem 3 and the protective sleeve 15 are in sliding fit.

[0037] like Figure 4 , Figure 5 As shown, the drive mechanism 4 includes a drive motor 41 and a transmission gear 42. The transmission gear 42 includes a gear part 421 and a cam part 422. The output end of the drive motor 41 is connected to a drive gear 43. The gear part 421 meshes with the drive gear 43. The cam part 422 abuts against the transmission bearing 53. The operation of the drive motor 41 drives the transmission gear 42 to rotate circumferentially, causing the cam part 422 to rotate, which in turn drives the transmission bearing 53 to rotate circumferentially and pushes the transmission bracket 51 to move.

[0038] like Figure 4 As shown, the transmission mechanism 5 includes a transmission bracket 51, two sets of return springs 52, and a transmission bearing 53. The transmission bracket 51 is provided with two sets of positioning bosses 511. One end of the return spring 52 is sleeved on the positioning boss 511, and the other end abuts against the inner wall of the valve seat 1. The transmission bracket 51 is provided with two sets of connecting bosses at intervals. A connecting pin 512 is provided between the two sets of connecting bosses. The transmission bearing 53 is installed on the connecting pin 512. The transmission bracket 51 is linked with the drive mechanism 4 through the transmission bearing 53. When the drive mechanism 4 operates, it pushes the valve stem 3 to extend through the transmission bearing 53. The return spring 52 is used to retract the valve stem 3.

[0039] like Figure 6 , Figure 7 As shown, a sensing support plate 513 extends outward from the transmission bracket 51. A displacement sensor is provided inside the valve seat 1. A magnet 54 is connected to the sensing support plate 513. The magnet 54 is T-shaped and is injection molded to the sensing support plate 513.

[0040] like Figure 8 , Figure 9 As shown, the sealing element 7 includes a sealing seat 72, a first oil seal 73, and a second oil seal 74. The sealing seat 72 has sealing cavities 721 at both ends for accommodating the first oil seal 73 and the second oil seal 74. A sealing boss 75 is formed between the two sets of sealing cavities 721, and an exhaust channel 71 is opened at the sealing boss 75.

[0041] The sealing seat 72 has an exhaust ring groove 76 on its outer periphery, and the exhaust passage 71 is connected to the exhaust ring groove 76.

[0042] The working principle of this embodiment is as follows:

[0043] In the initial state, the valve stem 3 is in the retracted position under the elastic force of the return spring 52 on the transmission bracket 51, and the sealing disc 6 abuts against the positioning disc 8, sealing the exhaust gas circulation pipe. The transmission bearing 53 on the transmission bracket 51 contacts the lowest point of the cam portion 422 of the transmission gear 42, and the drive motor 41 is in a stationary state.

[0044] When the ECU issues an start command, the drive motor 41 starts, and the drive gear 43 at its output end drives the gear part 421 of the transmission gear 42 to rotate, and the cam part 422 of the transmission gear 42 rotates accordingly. During the rotation, the cam part 422 abuts against the transmission bearing 53, pushing the transmission bearing 53 to move along the cam profile. The transmission bearing 53 drives the transmission bracket 51 and the valve stem 3 to move linearly in the extension direction through the connecting pin 512, and the return spring 52 is compressed. The valve stem 3 passes through the guide sleeve 12 in the drive channel 11, driving the sealing disc 6 to leave the positioning disc 8, and the exhaust gas recirculation pipe opens.

[0045] During the extension of the valve stem 3, the T-shaped magnet 54 on the sensing support plate 513 extending outward from the transmission bracket 51 moves with the transmission bracket 51. The displacement sensor in the valve seat 1 senses the position change of the magnet 54 and feeds the signal back to the ECU.

[0046] When the ECU issues a shutdown command or requires valve stem 3 to reset, the drive motor 41 reverses its rotation or stops supplying power. The cam portion 422 of the transmission gear 42 continues to rotate to the release position. Under the elastic force of the reset spring 52, the transmission bracket 51 drives the valve stem 3 to move linearly in the contraction direction, and the transmission bearing 53 moves in the opposite direction along the cam profile. The valve stem 3 drives the sealing disc 6 to move towards the positioning disc 8 until the sealing disc 6 abuts against the positioning disc 8, and the exhaust gas recirculation pipe is closed.

[0047] If a small leak of exhaust gas occurs during the repeated opening and closing of the valve, the leaked gas first enters the area between the seal 7 and the guide sleeve 12 through the gap between the guide sleeve 12 and the valve stem 3, then penetrates into the exhaust channel 71 at the sealing boss 75 of the seal 7, and then collects through the exhaust ring groove 76 on the outer periphery of the sealing seat 72, and finally exits from the exhaust hole 13 on the drive channel 11 to the outside of the valve seat 1.

[0048] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A waste gas recirculation valve assembly for preventing jamming, comprising a valve seat, a valve cover, a valve stem, a drive mechanism, a transmission mechanism, and a sealing disc, wherein the valve seat is provided with a drive channel, the transmission mechanism is connected to the valve stem, one end of the valve stem is linked to the drive mechanism through the transmission mechanism, and the other end passes through the drive channel and is connected to the sealing disc, characterized in that: The drive channel is fitted with a guide sleeve and a seal on the outer periphery of the valve stem. The drive channel has an exhaust hole for exhaust gas discharge at the seal. The seal has several sets of exhaust channels. The exhaust channels are connected to the exhaust holes. If exhaust gas leaks slightly, it can be discharged from the exhaust holes through the exhaust channels.

2. The anti-jamming exhaust gas recirculation valve assembly according to claim 1, characterized in that: The sealing element includes a sealing seat, a first oil seal, and a second oil seal. The sealing seat has receiving grooves at both ends for accommodating the first oil seal and the second oil seal. A sealing boss is formed between the two sets of receiving grooves. The exhaust channel is located at the sealing boss.

3. The anti-jamming exhaust gas recirculation valve assembly according to claim 2, characterized in that: An exhaust ring groove is provided on the outer periphery of the sealing seat, and the exhaust channel is connected to the exhaust ring groove.

4. The anti-jamming exhaust gas recirculation valve assembly according to claim 1, characterized in that: The transmission mechanism includes a transmission bracket, several sets of return springs, and a transmission bearing. The transmission bracket is provided with several sets of positioning bosses. One end of the return spring is sleeved on the positioning boss, and the other end abuts against the inner wall of the valve seat. The transmission bracket has two sets of connecting bosses spaced apart, and a connecting pin is provided between the two sets of connecting bosses. The transmission bearing is installed on the connecting pin. The transmission bracket is linked with the drive mechanism through the transmission bearing. The operation of the drive mechanism pushes the valve stem to extend through the transmission bearing, and the return spring is used to retract the valve stem.

5. The anti-jamming exhaust gas recirculation valve assembly according to claim 4, characterized in that: The transmission bracket extends outward with a sensing support plate, the valve seat is equipped with a displacement sensor, the sensing support plate is connected to a magnet, the magnet is T-shaped, and the magnet is injection molded to the sensing support plate.

6. The anti-jamming exhaust gas recirculation valve assembly according to claim 4, characterized in that: The drive mechanism includes a drive motor and a transmission gear. The transmission gear includes a gear section and a cam section. The output end of the drive motor is connected to the drive gear. The gear section meshes with the drive gear. The cam section abuts against the transmission bearing. The operation of the drive motor drives the transmission gear to rotate circumferentially, which in turn causes the cam section to rotate, thereby driving the transmission bearing to rotate circumferentially and pushing the transmission bracket to move.

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