Exhaust gas recirculation valve and engine

Abstract

The disclosure provides a kind of exhaust gas recirculation valve and engine, belong to automobile parts technical field.Exhaust gas recirculation valve includes valve housing, guide sleeve, valve stem, first sealing ring and second sealing ring.Guide sleeve, first sealing ring and second sealing ring are fixed in the inside of valve housing, and annular sleeve valve stem, with valve stem sliding connection.First sealing ring and second sealing ring are sequentially located in the end of guide sleeve close to exhaust manifold.Valve housing has gas passage, first sealing ring has the notch of through sidewall, one end of gas passage is communicated with the notch, and the other end is communicated with the outside of valve housing.Therefore even if valve housing is corroded by exhaust gas after producing powder, powder is not easy to enter between guide sleeve and valve stem, so that the sliding resistance of valve stem is smaller.If there is exhaust gas through second sealing ring, it can also be discharged to the outside of valve housing through the notch and gas passage, so as to avoid exhaust gas into guide sleeve, avoid the impurities in exhaust gas to increase the movement resistance of valve stem by remaining in guide sleeve.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of automobile accessories, in particular to a waste gas recirculation valve and an engine. BACKGROUND

[0002] The waste gas recirculation valve is installed between the intake manifold and the exhaust manifold of an automobile engine, and is used to control the amount of waste gas entering the intake manifold.

[0003] In the related art, the waste gas recirculation valve includes a valve housing, a guide sleeve, and a valve rod. The guide sleeve is fixed inside the valve housing, and the guide sleeve surrounds the valve rod and is in sliding connection with the valve rod. Up and down movement of the valve rod can control the opening degree of the waste gas recirculation valve.

[0004] However, powder is generated after the valve housing near the exhaust manifold is corroded by waste gas, and the powder is easy to enter between the guide sleeve and the valve rod, resulting in increased movement resistance of the valve rod, so that the response of the waste gas recirculation valve is delayed, and in severe cases, the waste gas recirculation valve is even stuck. SUMMARY

[0005] The present disclosure provides a waste gas recirculation valve, which can solve the technical problems existing in the related art. The technical scheme of the oil pressure sensor is as follows:

[0006] The present disclosure provides a waste gas recirculation valve, which is located between an intake manifold and an exhaust manifold. The waste gas recirculation valve includes a valve housing, a guide sleeve, a valve rod, a first sealing ring, and a second sealing ring.

[0007] The guide sleeve is fixed inside the valve housing, and the guide sleeve surrounds the valve rod and is in sliding connection with the valve rod.

[0008] The first sealing ring and the second sealing ring are fixed inside the valve housing and surround the valve rod. The first sealing ring and the second sealing ring are located at one end of the guide sleeve close to the exhaust manifold, and the first sealing ring is located between the guide sleeve and the second sealing ring.

[0009] The valve housing is opposite the first sealing ring and has an air-proof channel. The first sealing ring has a notch penetrating the side wall. One end of the air-proof channel is in communication with the notch, and the other end is in communication with the outside of the waste gas recirculation valve.

[0010] In one possible implementation, an annular groove is arranged on the inner wall of the valve housing. The annular groove surrounds the first sealing ring, and the annular groove is in communication with the notch.

[0011] One end of the air-proof channel is in communication with the notch through the annular groove.

[0012] In a possible implementation, the notch is a plurality of notches, and the plurality of notches are in communication with the annular groove.

[0013] In a possible implementation, the number of notches is four.

[0014] In a possible implementation, the flow area of the plurality of notches is greater than the flow area of the anti-gas passage.

[0015] In a possible implementation, the axial width of the annular groove is greater than the axial width of the notch.

[0016] In a possible implementation, the first sealing ring has a groove, an opening of the groove faces the first sealing ring, the groove is coaxial with the valve rod, and the groove is in communication with the anti-gas passage through the notch.

[0017] In a possible implementation, the notch is semicircular.

[0018] In a possible implementation, the thickness of the first sealing ring is greater than the thickness of the second sealing ring.

[0019] In a possible implementation, the first sealing ring and the second sealing ring are skeleton type sealing rings.

[0020] In a possible implementation, the number of anti-gas passages is one.

[0021] In a possible implementation, the exhaust gas recirculation valve further comprises a scraper, a dust cover, and a pressing plate.

[0022] The scraper, the dust cover, and the pressing plate are fixed inside the valve housing and located on the side of the second sealing ring close to the exhaust manifold, the dust cover is located between the scraper and the pressing plate, and the scraper, the dust cover, and the pressing plate are sleeved on the valve rod.

[0023] The pressing plate is in interference fit with the valve housing.

[0024] In a possible implementation, the material of the guide sleeve is stainless steel, and the inner wall of the guide sleeve has a polytetrafluoroethylene (PTFE) coating.

[0025] In a second aspect, the disclosure also provides an engine comprising the exhaust gas recirculation valve according to any one of the first aspect.

[0026] The technical solutions provided by the disclosure have at least the following beneficial effects:

[0027] The exhaust gas recirculation valve provided by the present disclosure has the first sealing ring and the second sealing ring located on the side of the guide sleeve close to the exhaust manifold, so that even if powder is generated due to corrosion of the valve shell close to the exhaust manifold, the powder is not easy to pass through the first sealing ring and the second sealing ring to enter between the guide sleeve and the valve rod, so that the resistance of the valve rod during movement is small, the valve rod moves more smoothly, and the corresponding speed of the exhaust gas recirculation valve is improved.

[0028] In addition, the air-proof channel is arranged at the position opposite to the first sealing ring of the valve shell, if the exhaust gas passes through the second sealing ring, the exhaust gas can be sequentially discharged to the outside of the shell through the gap on the first sealing ring and the air-proof channel, so that the exhaust gas can be avoided from entering the guide sleeve, and the movement resistance of the valve rod caused by impurities in the exhaust gas remaining in the guide sleeve is avoided.

[0029] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0030] The drawings incorporated into the specification and forming a part thereof, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the disclosure. In the drawings:

[0031] Figure 1 is a structural schematic diagram of an exhaust gas recirculation valve according to an embodiment of the present disclosure;

[0032] Figure 2 is a sectional view of an exhaust gas recirculation valve according to an embodiment of the present disclosure;

[0033] Figure 3 is a partial structural schematic diagram of an exhaust gas recirculation valve according to an embodiment of the present disclosure;

[0034] Figure 4 is a structural schematic diagram of a first sealing ring according to an embodiment of the present disclosure.

[0035] LEGEND

[0036] 1, shell, 10, air-proof channel, 11, annular groove, 101, gas inlet, 102, exhaust port;

[0037] 2, guide sleeve;

[0038] 3, valve rod;

[0039] 4, first sealing ring, 40, gap, 41, groove;

[0040] 5, second sealing ring;

[0041] 6, wiper;

[0042] 7. A dust cover;

[0043] 8. A press plate.

[0044] The specific embodiments of the present disclosure have been shown and described in the above drawings, and will be described in more detail hereinafter. These drawings and detailed description are not intended to limit the scope of the present disclosure concept in any way, but to illustrate the present disclosure concept to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0045] In order to make the purposes, technical solutions and advantages of the present disclosure clearer, the embodiments of the present disclosure will be further described in detail below with reference to the drawings.

[0046] The terms used in the embodiments of the present disclosure are only used to explain the embodiments of the present disclosure, and are not intended to limit the present disclosure. Unless otherwise defined, the technical terms or scientific terms used herein should be understood as the general meaning understood by those skilled in the art to which the present disclosure belongs. The terms "first", "second", "third" and the like used in the specification and claims of the present patent application do not represent any order, number or importance, but are only used to distinguish different components. Similarly, "one" or "a" and the like do not represent a quantity limitation, but represent the existence of at least one. The terms "include" or "contain" and the like mean that the elements or objects appearing before "include" or "contain" cover the elements or objects listed after "include" or "contain" and their equivalents, and do not exclude other elements or objects. The terms "connected" or "connected" and the like are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to represent relative positional relationships, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0047] The exhaust gas recirculation valve is installed between the intake manifold and the exhaust manifold of the automobile engine, and has an air inlet and an air outlet. The exhaust port is in communication with the exhaust manifold, and the exhaust port is in communication with the intake manifold. The exhaust gas recirculation valve can adjust the opening degree, so as to control the amount of exhaust gas entering the exhaust gas recirculation valve from the exhaust manifold, and further control the amount of exhaust gas entering the intake manifold.

[0048] In the related art, the exhaust gas recirculation valve includes a valve housing, a guide sleeve and a valve rod. The guide sleeve is fixed inside the valve housing, and the guide sleeve sleeves the valve rod, so that the valve rod slides along the guide sleeve to control the opening degree of the air inlet. However, powder is generated after the valve housing near the exhaust manifold is corroded by exhaust gas, and the powder is easy to enter between the guide sleeve and the valve rod, resulting in increased movement resistance of the valve rod, so that the response of the exhaust gas recirculation valve is delayed, and in severe cases, the exhaust gas recirculation valve is even stuck.

[0049] In view of the above technical problems, the present disclosure provides a kind of exhaust gas recirculation valve, as shown in Figure 1 And Figure 2 Exhaust gas recirculation valve is located between intake manifold and exhaust manifold, exhaust gas recirculation valve includes valve housing 1, guide sleeve 2, valve stem 3, first sealing ring 4 and second sealing ring 5.Guide sleeve 2 is fixed in the inside of valve housing 1, guide sleeve 2 is sleeved on valve stem 3, and is slidably connected with valve stem 3.First sealing ring 4 and second sealing ring 5 are fixed in the inside of valve housing 1, and are sleeved on valve stem 3, first sealing ring 4 and second sealing ring 5 are located at the end of guide sleeve 2 close to exhaust manifold, and first sealing ring 4 is located between guide sleeve 2 and second sealing ring 5.Valve housing 1 has anti-air passage 10 at the position opposite to first sealing ring 4, first sealing ring 4 has gap 40 through the side wall, one end of anti-air passage 10 is communicated with gap 40, and the other end is communicated with the outside of exhaust gas recirculation valve.

[0050] Wherein, exhaust gas recirculation valve can also be called EGR (Exhaust Gas Recirculation) valve.Valve housing 1 has intake port 101 and exhaust port 102, intake port 101 is communicated with exhaust manifold, and exhaust port 102 is communicated with intake manifold.Guide sleeve 2, first sealing ring 4 and second sealing ring 5 are all interference fit with the inner wall of valve housing 1, so as to be fixed in valve housing 1.The inside of valve housing 1 also has driving mechanism, driving mechanism is drivingly connected with valve stem 3, and is located at the side of valve stem 3 away from exhaust manifold, so as to drive valve stem 3 to move up and down.Anti-air passage 10 can be regarded as a through hole on the side wall at the position opposite to first sealing ring 4 of valve housing 1.

[0051] The technical scheme provided by the present disclosure, because first sealing ring 4 and second sealing ring 5 are located at the side of guide sleeve 2 close to exhaust manifold (intake port 101), so even if valve housing 1 is corroded by exhaust gas near exhaust manifold to produce powder, the powder is not easy to pass through first sealing ring 4 and second sealing ring 5 and enter between guide sleeve 2 and valve stem 3, so that the resistance of valve stem 3 when moving is smaller, and the corresponding speed of exhaust gas recirculation valve is improved.

[0052] In addition, anti-air passage 10 is arranged at the position opposite to first sealing ring 4 of valve housing 1, if exhaust gas passes through second sealing ring 5, exhaust gas can pass through gap 40 on first sealing ring 4 and anti-air passage 10 in turn and be discharged to the outside of housing 1, so that exhaust gas can be avoided to enter guide sleeve 2, and then the impurities in exhaust gas are avoided to stay in guide sleeve 2 to increase the movement resistance of valve stem 3.

[0053] In the related art, the first sealing ring 4 and the second sealing ring 5 of the EGR valve are located at the end of the guide sleeve 2 away from the exhaust manifold, and are mainly used to avoid the exhaust gas entering the drive mechanism in the valve housing 1, so as to ensure the normal work of the drive mechanism. In addition, a retainer or an exhaust gasket is arranged between the first sealing ring 4 and the second sealing ring 5, the side wall of the valve housing 1 has a through hole, and the side wall of the retainer or the exhaust gasket also has a through hole, so that the cavity (the retainer or the exhaust gasket, etc.) between the first sealing ring 4 and the second sealing ring 5 is communicated with the outside of the EGR valve through the through hole, so as to exhaust the exhaust gas entering the cavity between the first sealing ring 4 and the second sealing ring 5.

[0054] Since the first sealing ring 4 in the embodiment of the present disclosure has the notch 40, and the notch 40 is communicated with the anti-gas channel 10 (as shown in Figure 2 , the EGR valve provided by the embodiment of the present disclosure can not be provided with a retainer or an exhaust gasket, thereby reducing the number of parts in the EGR valve, and reducing the complexity of assembling the EGR valve, and improving the efficiency of assembling the EGR valve. In addition, the notch 40 on the first sealing ring 4 is easy to process, and does not increase the manufacturing difficulty of the EGR valve.

[0055] In addition, since the EGR valve provided by the embodiment of the present disclosure does not need to be provided with a retainer or an exhaust gasket between the first sealing ring 4 and the second sealing ring 5, the axial length of the valve rod 3 can be reduced, or the installation space of other parts can be increased.

[0056] Next, the way in which the notch 40 of the first sealing ring 4 is communicated with the anti-gas channel 10 will be exemplarily described.

[0057] In some examples, at least a part of the notch 40 is opposite to the anti-gas channel 10, so that the exhaust gas can be sequentially discharged through the notch 40 and the anti-gas channel 10.

[0058] In order to make the notch 40 more easily communicated with the anti-gas channel 10, in some examples, as shown in Figure 2 and Figure 3 , the inner wall of the valve housing 1 is provided with an annular groove 11, the annular groove 11 surrounds the first sealing ring 4, and the annular groove 11 is communicated with the notch 40, and one end of the anti-gas channel 10 is communicated with the notch 40 through the annular groove 11. In this way, even if the notch 40 is not arranged opposite to the anti-gas channel 10, the notch 40 can also be communicated with the anti-gas channel 10 through the annular groove 11.

[0059] Therefore, if exhaust gas passes through the second sealing ring 5, the exhaust gas can be discharged to the outside of the valve body 1 through the notch 40, the annular groove 11, and the gas-proof channel 10 in sequence. In this way, when installing the first sealing ring 4 into the valve body 1, it is not necessary to align the notch 40 with the gas-proof channel 10. The notch 40 can be connected to the gas-proof channel 10 through the annular groove 11 at any angle, thereby reducing the complexity and difficulty of installing the first sealing ring 4.

[0060] In some examples, the axial length of the annular groove 11 is greater than the axial length of the notch 40, thereby preventing the inner wall of the valve housing 1 from blocking the notch 40, and thus allowing the exhaust gas to pass smoothly through the notch 40 into the annular groove 11.

[0061] In addition to designing the valve body 1 to ensure the connection between the notch 40 and the gas-proof channel 10, the notch 40 can also be connected to the gas-proof channel 10 by designing the first sealing ring 4.

[0062] In some examples, such as Figure 2 and Figure 4 As shown, there are multiple notches 40, and all of the notches 40 are connected to the annular groove 11, thereby increasing the gas flow area of ​​the notches 40 and allowing exhaust gas to flow out from the multiple notches 40. In this way, if exhaust gas passes through the second sealing ring 5, it can quickly enter the annular groove 11, thereby allowing the exhaust gas to be quickly discharged to the outside of the valve body 1.

[0063] For example, such as Figure 4 As shown, there are 4 gaps of 40.

[0064] In some examples, such as Figure 2 and 4 As shown, the first sealing ring 4 has a groove 41, the opening of which faces the first sealing ring 4. The groove 41 is coaxial with the valve stem 3 and communicates with the gas-proof channel 10 through a notch 40. The groove 41 can be regarded as a cavity formed between the inner wall of the first sealing ring 4 and the valve stem 3. After the exhaust gas passes through the second sealing ring 5, it can enter the annular groove 11 through the groove 41 and the notch 40, and then pass through the gas-proof channel 10. The notch 40 is located on the side wall outside the groove 41, which facilitates the processing of the notch 40 without affecting the sealing performance between the first sealing ring 4 and the valve stem 3.

[0065] In some examples, such as Figure 4 As shown, the notch 40 is located at one end of the first sealing ring 4 near the second sealing ring 5 and is semi-circular.

[0066] The shape of the notch 40 is not specifically limited in the embodiments disclosed herein. In other examples, the notch 40 may also be a circular through hole on the first sealing ring 4, through which exhaust gas can be discharged after passing through the second sealing ring 5, through the groove 41, the through hole and the gas-proof channel 10.

[0067] In some examples, both the first sealing ring 4 and the second sealing ring 5 are skeleton-type sealing rings.

[0068] In some examples, such as Figure 2 As shown, the thickness of the first sealing ring 4 is greater than the thickness of the second sealing ring 5, which makes it easier to process the notch 40 on the first sealing ring 4.

[0069] Of course, in other examples, the thickness of the first sealing ring 4 and the thickness of the second sealing ring 5 may be equal, and this disclosure does not specifically limit this.

[0070] In some examples, such as Figure 2 As shown, there is only one venting channel 10. Since only a small portion of the exhaust gas passes through the second sealing ring 5, only one venting channel 10 is needed to discharge the exhaust gas. If there are too many venting channels 10, impurities outside the exhaust gas recirculation valve may enter the gap 40 of the first sealing ring 4 through the venting channel 10, which may cause external impurities to enter between the guide sleeve 2 and the valve stem 3, thereby increasing the movement resistance of the valve stem 3.

[0071] In some examples, the sum of the flow areas of multiple gaps 40 is greater than the flow area of ​​the gas-proof channel 10, thus allowing the exhaust gas to smoothly enter the gas-proof channel 10.

[0072] In some examples, such as Figure 2 As shown, the exhaust gas recirculation valve also includes a scraper 6, a dust cover 7, and a pressure plate 8. The scraper 6, dust cover 7, and pressure plate 8 are fixed inside the valve body 1 and are located on the side of the second sealing ring 5 near the exhaust manifold. The dust cover 7 is located between the scraper 6 and the pressure plate 8. The scraper 6, dust cover 7, and pressure plate 8 are ring-fitted around the valve stem 3. The pressure plate 8 is interference-fitted with the valve body 1.

[0073] The portion of valve stem 3 near the exhaust manifold comes into contact with exhaust gases, causing carbon deposits to accumulate on its surface. The scraper 6 is interference-fitted with the valve body 1, while the valve stem 3 is clearance-fitted. This design avoids increasing the resistance during valve stem 3 sliding while effectively scraping away carbon deposits from its surface. This prevents excessive carbon buildup on the valve stem 3, which could lead to increased resistance during movement, and also prevents the valve stem 3 from carrying carbon deposits into the guide sleeve 3.

[0074] The dust cover 7 is used to block the exhaust gas from passing through the scraping piece 6 and the second sealing ring 5. The base of the dust cover 7 is located between the scraping piece 6 and the pressing plate 8, and the bottom surface of the base of the dust cover 7 abuts against the pressing plate 8. Since the pressing plate 8 is fixed in the valve housing 1, the dust cover 7 is fixed in the interior of the valve housing 1,

[0075] In the related art, the pressing plate 8 is fixed to the inner wall of the valve housing 1 by riveting. Thus, there is a gap between the pressing plate 8 and the inner wall of the valve housing 1 at the part without rivets. Therefore, the exhaust gas is easy to enter between the pressing plate 8 and the valve housing 1. When the valve housing 1 is corroded by the exhaust gas, the rivets are easy to fall off, and then the pressing plate 8, the dust cover 7 and the scraping piece 6 are easy to fall off. Thus, the exhaust gas is easy to contact with the second sealing ring 5, and the exhaust gas is easy to pass through the second sealing ring 5.

[0076] In the embodiment of the present disclosure, the pressing plate 8 is interference-fitted with the inner wall of the valve housing 1. Thus, the fitting area between the pressing plate 8 and the valve housing 1 is increased, the exhaust gas is not easy to enter between the pressing plate 8 and the valve housing 1, and the relative part of the valve housing 1 and the pressing plate 8 is not easy to be corroded. Thus, the pressing plate 8 is not easy to fall off. In this way, the connection strength of the dust cover 7 is improved, and then the dust cover 7 is not easy to fall off. Thus, the service life of the exhaust gas recirculation valve is improved.

[0077] In some examples, the material of the guide sleeve 2 is stainless steel, and the inner wall of the guide sleeve 2 has a PTFE (Poly TetraFluoroethylene) coating. When the valve rod 3 slides along the inner wall of the guide sleeve 2, the PTFE coating can reduce the sliding resistance of the valve rod 3, so that the valve rod 3 can slide more smoothly, and thus the exhaust gas recirculation valve can respond quickly. In addition, the guide sleeve 2 is made of the above-mentioned material, and the service life of the guide sleeve 2 is also improved.

[0078] In some examples, the inner wall of the housing 1 has a first mounting hole, a second mounting hole, a third mounting hole, a fourth mounting hole and a fifth mounting hole. The first mounting hole, the second mounting hole, the third mounting hole, the fourth mounting hole and the fifth mounting hole are concentrically arranged and sequentially arranged in the direction close to the intake port 101, and the hole diameters gradually increase.

[0079] The guide sleeve 2 is arranged in the first mounting hole, the first sealing ring 4 and the second sealing ring 5 are arranged in the second mounting hole, and since the diameter of the second mounting hole is larger than that of the first mounting hole, the step structure between the first mounting hole and the second mounting hole can limit the first sealing ring 4 when the first sealing ring 4 is installed. When the second sealing ring 5 is installed, the top of the second sealing ring 5 abuts against the bottom of the first sealing ring 4, so as to limit the second sealing ring 5. Similarly, the wiper 6 is limited in the third mounting hole, the base of the dust cover 7 is limited in the fourth mounting hole, and the pressing plate 8 is limited in the fifth mounting hole. The concentric arrangement of the first mounting hole, the second mounting hole, the third mounting hole, the fourth mounting hole and the fifth mounting hole can ensure the coaxiality when the valve rod 3 moves, and reduce the error generated by the up-down movement of the valve rod 3.

[0080] The center of the guide sleeve 2 is longitudinally provided with a first valve rod through hole, the first sealing ring 4 is provided with a second valve rod through hole, the second sealing ring 5 is provided with a third valve rod through hole, the center of the wiper 6 is longitudinally provided with a fourth valve rod through hole, and the center of the dust cover 7 is longitudinally provided with a fifth valve rod through hole. The first valve rod through hole, the second valve rod through hole, the third valve rod through hole, the fourth valve rod through hole and the fifth valve rod through hole are concentrically arranged. Through the above structure, the coaxiality of the valve rod 3 during the up-down movement can be ensured, and the error generated by the up-down movement of the valve rod 3 is further reduced.

[0081] The engine provided by the embodiment of the present disclosure also includes the exhaust gas recirculation valve.

[0082] The engine also includes an intake manifold and an exhaust manifold, the air inlet 101 of the exhaust gas recirculation valve is communicated with the exhaust manifold, and the air outlet 102 is communicated with the intake manifold. When the valve rod 3 in the exhaust gas recirculation valve moves, the size of the air inlet 101 can be adjusted, so as to adjust the amount of exhaust gas entering the exhaust gas recirculation, and further control the amount of exhaust gas entering the intake manifold.

[0083] The engine provided by the embodiment of the present disclosure, since the first sealing ring 4 and the second sealing ring 5 in the exhaust gas recirculation valve are located on the side of the guide sleeve 2 close to the exhaust manifold, even if the valve housing 1 close to the exhaust manifold is corroded by the exhaust gas to produce powder, the powder is not easy to enter between the guide sleeve 2 and the valve rod 3, so that the resistance of the valve rod 3 during movement is smaller.

[0084] In addition, the air-proof channel 10 is arranged at the position opposite to the first sealing ring 4 of the valve housing 1. If the exhaust gas passes through the second sealing ring 5, the exhaust gas can be sequentially discharged to the outside of the housing 1 through the gap 40 on the first sealing ring and the air-proof channel 10, so as to avoid the exhaust gas entering the guide sleeve 2, and further avoid increasing the movement resistance of the valve rod 3 due to the impurities in the exhaust gas remaining in the guide sleeve 2, and improve the response speed of the exhaust gas recirculation valve. In this way, the amount of exhaust gas entering the intake manifold from the exhaust gas recirculation valve can be accurately controlled according to the engine speed.

[0085] The above merely provides the optional embodiments of the present disclosure, and does not intend to limit the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. An exhaust gas recirculation valve characterized by, The exhaust gas recirculation valve is located between the intake manifold and the exhaust manifold, and comprises a valve housing (1), a guide sleeve (2), a valve rod (3), a first sealing ring (4) and a second sealing ring (5); The inner wall of the valve housing (1) has a first mounting hole, the guide sleeve (2) is fixed in the first mounting hole, the guide sleeve (2) surrounds the valve rod (3) and is in sliding connection with the valve rod (3); The inner wall of the valve housing (1) further has a second mounting hole, the second mounting hole is located at one end of the guide sleeve (2) close to the air inlet (101) of the valve housing (1), the diameter of the second mounting hole is larger than that of the first mounting hole, the first sealing ring (4) and the second sealing ring (5) are fixed in the second mounting hole, the first sealing ring (4) is located between the guide sleeve (2) and the second sealing ring (5), the top of the first sealing ring (4) abuts against one end of the second mounting hole close to the first mounting hole, and the top of the second sealing ring (5) abuts against the bottom of the first sealing ring (4); The position opposite to the first sealing ring (4) of the second mounting hole has an airproof channel (10), the first sealing ring (4) has a plurality of notches (40) penetrating the side wall, the inner wall of the second mounting hole is provided with an annular groove (11), the annular groove (11) surrounds the first sealing ring (4), the annular groove (11) is in communication with the notches (40), the length of the annular groove (11) in the axial direction is greater than that of the notches (40) in the axial direction, one end of the airproof channel (10) is in communication with the notches (40) through the annular groove (11), and the other end of the airproof channel (10) is in communication with the outside of the exhaust gas recirculation valve.

2. The exhaust gas recirculation valve of claim 1, wherein, The number of the notches (40) is four.

3. The exhaust gas recirculation valve of claim 1, wherein, The first sealing ring (4) has a groove (41), the opening of the groove (41) faces the second sealing ring (5), the groove (41) is coaxial with the valve rod (3), and the groove (41) is in communication with the airproof channel (10) through the notches (40).

4. The exhaust gas recirculation valve of claim 1, wherein, The thickness of the first sealing ring (4) is greater than that of the second sealing ring (5).

5. The exhaust gas recirculation valve of claim 1, wherein, The number of the airproof channels (10) is one.

6. The exhaust gas recirculation valve according to any one of claims 1 to 5, characterized in that The exhaust gas recirculation valve further comprises a scraper (6), a dust cover (7) and a pressing plate (8); The scraper (6), the dust cover (7) and the pressing plate (8) are fixed in the interior of the valve housing (1) and located on the side of the second sealing ring (5) close to the exhaust manifold, the dust cover (7) is located between the scraper (6) and the pressing plate (8), and the scraper (6), the dust cover (7) and the pressing plate (8) surround the valve rod (3); The pressing plate (8) is in interference fit with the valve housing (1).

7. The exhaust gas recirculation valve according to any one of claims 1 to 5, characterized in that The material of the guide sleeve (2) is stainless steel, and the inner wall of the guide sleeve (2) has a polytetrafluoroethylene PTFE coating.

8. An engine characterized by, The engine comprises the exhaust gas recirculation valve according to any one of claims 1-7.

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