Corrosion-resistant EGR valve structure

Abstract

A corrosion-resistant EGR valve structure comprises a valve body and a valve rod, the valve body is provided with an air channel with openings in the two ends and a valve hole communicated to the air channel, the valve rod is inserted into the valve hole in a sliding mode and provided with a valve block end extending to the air channel and used for controlling opening and closing of the air channel, and a lining is installed at the junction of the valve hole and the air channel and surrounds the valve rod. A groove in the circumferential direction is formed in the inner ring side of the lining, a sealing ring is arranged in the groove, and the inner ring side of the sealing ring abuts against the outer circumferential wall of the valve rod. Compared with the prior art, according to the scheme, the lining is arranged at the junction of the valve hole and the air channel, and the sealing ring is arranged in the groove of the lining, so that the sealing performance is effectively improved through the abutting action between the sealing ring and the valve rod, and the probability that corrosive substances in the air channel enter the space between the valve rod and the valve hole is reduced; therefore, the problem that the valve body is easy to corrode is solved; meanwhile, the lining is independent of the valve body and the valve rod and can be disassembled, assembled and replaced when needed, and maintenance is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of gas valves, in particular to a corrosion-resistant EGR valve structure. Background Art

[0002] The function of the EGR system is to introduce a small portion of the exhaust gas in the car into the engine combustion chamber to re-combustion. Equipped with an EGR system can effectively reduce NOx emissions and can also bring additional fuel-saving benefits to gasoline engines.

[0003] Currently, poppet-type EGR valves are widely used and mature in the market. However, with the recent shift toward hybrid vehicles, gasoline engines generate more condensed water after combustion. Since the EGR valve body is commonly made of aluminum alloy, it is corroded by chlorine-containing condensed water. This corrosive agent has a certain risk of causing the EGR valve to stick, resulting in engine malfunction, malfunction light illumination, and even safety hazards in severe cases. Furthermore, the continued use of non-standard gasoline and engine oils in the market has placed higher demands on the corrosion resistance of current EGR valves. Utility Model Content

[0004] The purpose of the utility model is to solve the problem in the prior art that the EGR valve is easily corroded, thereby affecting the normal operation of the engine.

[0005] In order to solve the above problems, the utility model provides a corrosion-resistant EGR valve structure, including a valve body and a valve stem, the valve body is provided with an air passage with openings at both ends and a valve hole passing through the air passage, the valve stem is slidably inserted in the valve hole, and the valve stem has a valve plate end extending to the air passage and used to control the air passage switch, a bushing is installed at the junction of the valve hole and the air passage, the bushing surrounds the valve stem, the inner ring side of the bushing is provided with a circumferential groove, a sealing ring is provided in the groove, and the inner ring side of the sealing ring abuts against the outer peripheral wall of the valve stem.

[0006] Compared with the existing technology, the above scheme effectively improves the sealing performance by arranging the bushing at the junction of the valve hole and the air channel and arranging a sealing ring in the groove of the bushing, thereby preventing corrosive substances in the air channel from entering between the valve stem and the valve hole, thereby solving the problem of the valve body being easily corroded.

[0007] In an improved solution, a copper bushing is provided between the valve stem and the valve hole, the groove passes through the end face of the bushing facing the copper bushing, and the sealing ring is clamped between the groove and the copper bushing, thereby avoiding the problem of wear on the valve hole when the valve stem moves.

[0008] In an improved solution, an inner peripheral wall of the bushing at one end away from the valve hole is provided with a circumferential accommodating groove, so that the carbon deposits in the air passage can be accommodated by the accommodating groove.

[0009] In an improved solution, the bushing is made of stainless steel, thus having better corrosion resistance.

[0010] In an improved solution, the valve body is provided with an insert covering the inner circumferential wall of the airway, and the insert is provided with a through hole corresponding to the position of the valve hole, so that the inner circumferential wall of the airway is protected by the insert, thereby improving the corrosion resistance of the airway.

[0011] In an improved solution, the bushing is press-fitted into the through hole so that it can be disassembled and replaced when necessary, facilitating maintenance.

[0012] In an improved solution, the insert is made of stainless steel, thus having better corrosion resistance.

[0013] In an improved solution, the air duct includes a first hole section extending from the front side of the valve body to the middle of the valve body and a second hole section extending from the lower side of the valve body to the middle of the valve body. The first hole section and the second hole section are connected to each other, and the valve hole extends from the upper side of the valve body to the middle of the valve body and passes through to the upper side of the second hole section, thereby making the layout more reasonable. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A cross-sectional schematic diagram of a corrosion-resistant EGR valve structure.

[0015] Description of reference numerals:

[0016] 1. Valve body; 11. Airway; 111. First hole section; 112. Second hole section; 12. Valve hole; 13. Copper bushing; 2. Valve stem; 21. Valve plate end; 3. Bushing; 31. Groove; 32. Sealing ring; 33. Receiving groove; 4. Insert; 41. Through hole. DETAILED DESCRIPTION

[0017] It should be understood by those skilled in the art that the following embodiments are merely intended to explain the technical principles of the embodiments of the present application and are not intended to limit the scope of protection of the embodiments of the present application. Those skilled in the art may adjust them as needed to suit specific applications.

[0018] In the following descriptions of the embodiments, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of this application based on the specific circumstances.

[0019] In the embodiments of the present application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0020] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] See also Figure 1 The embodiment of the present invention provides a corrosion-resistant EGR valve structure, including a valve body 1 and a valve stem 2. The valve body 1 is provided with an air passage 11 with openings at both ends and a valve hole 12 passing through the air passage 11. The valve stem 2 is slidably inserted in the valve hole 12, and the valve stem 2 has a valve plate end 21 extending to the air passage 11 and used to control the opening and closing of the air passage 11. A bushing 3 is installed at the junction of the valve hole 12 and the air passage 11. The bushing 3 surrounds the valve stem 2, and the inner ring side of the bushing 3 is provided with a circumferential groove 31. A sealing ring 32 is provided in the groove 31, and the inner ring side of the sealing ring 32 abuts against the outer peripheral wall of the valve stem 2.

[0022] Compared with the prior art, the above scheme effectively improves the sealing performance by arranging the bushing 3 at the junction of the valve hole 12 and the air channel 11, and arranging the sealing ring 32 in the groove 31 of the bushing 3, thereby preventing the corrosive substances in the air channel 11 from entering between the valve stem 2 and the valve hole 12, thereby solving the problem that the valve body 1 is easily corroded.

[0023] In addition, the switching control of the airway 11 by the valve plate end 21 of the valve stem 2 belongs to the existing technology. For example, in this embodiment, the valve plate end 21 is provided with a sealing plate corresponding to the lower side of the second hole section 112. Through the movement of the valve stem 2, the sealing plate opens or blocks the second hole section 112; of course, it can also be in the form of other existing technologies, and this design does not limit this.

[0024] In this embodiment, a copper bushing 13 is provided between the valve stem 2 and the valve hole 12, and the groove 31 passes through the end face of the bushing 3 facing the copper bushing 13. The sealing ring 32 is clamped between the groove 31 and the copper bushing 13, thereby preventing the copper bushing 13 from causing wear to the valve hole 12 when the valve stem 2 moves.

[0025] Furthermore, an inner peripheral wall of the bushing 3 at one end away from the valve hole 12 is provided with a circumferential receiving groove 33 , so that the receiving groove 33 can accommodate carbon deposits in the air passage 11 .

[0026] The bushing 3 is preferably made of stainless steel so as to have good corrosion resistance.

[0027] As an optimization of this embodiment, the valve body 1 is provided with an insert 4 provided on the inner circumferential wall covering the air duct 11. The insert 4 is provided with a through hole 41 at a position corresponding to the valve hole 12, so that the inner circumferential wall of the air duct 11 is protected by the insert 4, thereby improving the corrosion resistance of the air duct 11. The insert 4 is preferably made of stainless steel, so as to have good corrosion resistance. Regarding the assembly of the insert 4 relative to the air duct 11, a two-half valve body 1 can be designed, and the insert 4 is assembled into the air duct 11 of one half of the valve body 1, and then the other half of the valve body 1 is merged. The bushing 3 is pressed into the through hole 41 of the insert 4 in an interference fit manner, so that it can be disassembled and replaced when necessary, which is convenient for maintenance.

[0028] In this embodiment, the air duct 11 includes a first hole section 111 extending from the front side of the valve body 1 to the middle of the valve body 1 and a second hole section 112 extending from the lower side of the valve body 1 to the middle of the valve body 1. The first hole section 111 and the second hole section 112 are connected to each other, and the valve hole 12 extends from the upper side of the valve body 1 to the middle of the valve body 1 and passes through to the upper side of the second hole section 112, thereby making the layout more reasonable.

[0029] It should be noted that, in the description of this application, the terms "inside", "outside" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is merely for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on this application. All directional indications (such as up, down, left, right, front, back, inside and outside) are only used to explain the relative positional relationship, movement, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0030] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "in the present embodiment", "specific example", or "some examples" means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0031] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A corrosion-resistant EGR valve structure, comprising a valve body (1) and a valve stem (2), wherein the valve body (1) is provided with an air passage (11) with openings at both ends and a valve hole (12) extending through the air passage (11), the valve stem (2) is slidably plugged into the valve hole (12), and the valve stem (2) has a valve plate end (21) extending to the air passage (11) and used for controlling the opening and closing of the air passage (11), characterized in that: A bushing (3) is installed at the junction of the valve hole (12) and the air passage (11), the bushing (3) surrounds the valve stem (2), the inner ring side of the bushing (3) is provided with a circumferential groove (31), the groove (31) is provided with a sealing ring (32), and the inner ring side of the sealing ring (32) abuts against the outer peripheral wall of the valve stem (2).

2. The corrosion-resistant EGR valve structure according to claim 1, characterized in that: A copper bushing (13) is provided between the valve stem (2) and the valve hole (12), the groove (31) extends through the end surface of the bushing (3) facing the copper bushing (13), and the sealing ring (32) is clamped between the groove (31) and the copper bushing (13).

3. The corrosion-resistant EGR valve structure according to claim 1 or 2, characterized in that: An inner peripheral wall of the bushing (3) at one end away from the valve hole (12) is provided with a circumferential accommodation groove (33).

4. The corrosion-resistant EGR valve structure according to claim 1, characterized in that: The bushing (3) is made of stainless steel.

5. The corrosion-resistant EGR valve structure according to claim 1, characterized in that: The valve body (1) is provided with an insert (4) arranged to cover the inner peripheral wall of the air channel (11), and the insert (4) is provided with a through hole (41) at a position corresponding to the valve hole (12).

6. The corrosion-resistant EGR valve structure according to claim 5, characterized in that: The bushing (3) is press-fitted into the through hole (41).

7. The corrosion-resistant EGR valve structure according to claim 5, characterized in that: The insert (4) is made of stainless steel.

8. The corrosion-resistant EGR valve structure according to claim 1, 5, 6 or 7, characterized in that: The air passage (11) comprises a first hole section (111) extending from the front side of the valve body (1) to the middle of the valve body (1) and a second hole section (112) extending from the lower side of the valve body (1) to the middle of the valve body (1), the first hole section (111) and the second hole section (112) being connected to each other, and the valve hole (12) extending from the upper side of the valve body (1) to the middle of the valve body (1) and passing through to the upper side of the second hole section (112).

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