Multiple sealing mechanism of exhaust gas recirculation valve

Abstract

The multiple sealing mechanism comprises a valve body, a valve rod, a sealing ring, a space ring, a guide sleeve and a protective cover, the guide sleeve is located at the upper position of the valve rod, the sealing ring and the space ring are located at the middle position of the valve rod, and the protective cover is located at the lower position of the valve rod. A connecting sleeve is arranged on the valve rod and between the sealing ring and the valve body and between the space ring and the valve body, the connecting sleeve is upwards connected with the guide sleeve and downwards connected with the protective cover, and a sealing piece is arranged on the valve rod and between the connecting sleeve and the protective cover. The sealing performance of the valve rod and the sealing ring can be effectively prevented from being influenced by corrosion of the valve body; corrosion particles are effectively prevented from entering the connecting sleeve and the guide sleeve. Through the multiple sealing modes of the guide sleeve, the sealing ring, the space ring, the connecting sleeve and the sealing piece, the sealing performance and the anti-corrosion effect are improved, clamping stagnation of the valve rod is prevented, and the working stability and efficiency are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of exhaust gas recirculation valves, and particularly relates to a sealing mechanism of an exhaust gas recirculation valve. Background Art

[0002] An exhaust gas recirculation valve (also known as an EGR valve) applied to a hybrid vehicle reintroduces an appropriate amount of exhaust gas into the cylinder to participate in re-combustion, thereby reducing the maximum temperature in the cylinder to reduce the NO X emissions in the exhaust gas. In order to ensure the normal operation of the engine and its performance is not affected too much, the exhaust gas recirculation amount must be controlled according to the change of the engine working condition.

[0003] The sealing mechanism of the traditional exhaust gas recirculation valve is a single-sealing structure, generally composed of a valve body, a valve stem, a sealing ring, a spacer ring (single-sealing structure), and a guide sleeve. When the exhaust gas (including corrosive particulate matter) enters the inside of the recirculation valve, it will first pass through the guide sleeve. When a long time or a large amount of exhaust gas passes through the guide sleeve, it will cause the exhaust gas to accumulate, resulting in water vapor condensation and wall hanging on the inner wall of the valve body, causing the inner diameter of the guide sleeve to become smaller and the valve stem to get stuck during movement, and the inner wall of the valve body to be corroded, resulting in the suspension of the operation of the exhaust gas recirculation valve system and reducing the use stability of the exhaust gas recirculation valve. Summary of the Invention

[0004] The purpose of the utility model is to solve at least one of the technical problems existing in the prior art, and provide a multi-sealing mechanism of an exhaust gas recirculation valve with good sealing performance and corrosion resistance, which can solve the problem that the single-sealing structure of the traditional exhaust gas recirculation valve is located at the upper end of the guide sleeve.

[0005] To achieve the above purpose, the utility model provides the following technical solutions: A multi-sealing mechanism of an exhaust gas recirculation valve, including a valve body, a valve stem, a sealing ring, a spacer ring, a guide sleeve, and a protective cover. The guide sleeve is located above the valve stem, the sealing ring and the spacer ring are located in the middle of the valve stem, and the protective cover is located below the valve stem. A connecting sleeve is installed on the valve stem and between the sealing ring and the spacer ring and the valve body. The connecting sleeve is connected to the guide sleeve upward and to the protective cover downward. A sealing piece is installed on the valve stem and between the connecting sleeve and the protective cover.

[0006] The outer shape of the sealing piece is in the shape of a lip. The connecting sleeve has a groove at the position where it is connected to the sealing piece. One side edge of the sealing piece is embedded and pressed into this groove to fix the sealing piece, which can increase the pull-out force of the sealing piece. The outer end of the protective cover is bent outward and downward to connect with the connecting sleeve, further enhancing its sealing performance. The sealing piece is made of PTFE plastic material, and the connecting sleeve is made of stainless steel material.

[0007] Compared with the prior art, the beneficial effects of the present utility model are as follows: The connecting sleeve is provided to isolate the condensed water and carbon deposits generated on the inner wall of the valve body, effectively preventing the valve body from being corroded and affecting the sealing performance between the valve stem and the sealing ring; the sealing piece is provided to effectively prevent corrosive particles from entering the connecting sleeve and the guide sleeve. Through the multiple sealing methods of the guide sleeve, the sealing ring, the spacer ring, the connecting sleeve, and the sealing piece, the sealing performance and anti-corrosion effect are improved, the jamming of the valve stem is prevented, and the working stability and efficiency are enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The present utility model will be further described below in conjunction with the drawings and embodiments:

[0009] Figure 1 is a schematic plan sectional structure view of the whole of the present utility model;

[0010] Figure 2 is Figure 1 an enlarged view of part A in

[0011] Reference numerals: 1, valve body; 2, guide sleeve; 3, valve stem; 4, sealing ring; 5, spacer ring; 6, connecting sleeve; 7, sealing piece; 8, protective cover; 61, groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0012] This part will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the drawings. The function of the drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present utility model. However, it should not be construed as a limitation on the protection scope of the present utility model.

[0013] In the description of the present utility model, it should be understood that the orientation descriptions, such as up, down, front, rear, left, right, etc., refer to the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the present utility model. In the description of the present utility model, greater than, less than, exceeding, etc. are understood as not including the number itself, and above, below, within, etc. are understood as including the number itself. If there is a description of first and second, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or the sequence relationship of the indicated technical features. In the description of the present utility model, unless otherwise clearly defined, words such as set, installed, connected, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present utility model in combination with the specific content of the technical solution.

[0014] Please refer to Figure 1-2, the present utility model provides a technical solution: a multi - seal mechanism for an exhaust gas recirculation valve, including a valve body 1, a valve stem 3, sealing rings 4 and spacer rings 5, a guide sleeve 2, and a protective cover 8 (the valve stem 3 is movably installed inside the valve body 1, and the guide sleeve 2, the sealing rings 4, the spacer rings 5, and the protective cover 8 are respectively connected to the outer wall of the valve stem 3; there are two sealing rings 4 located on the upper and lower sides of the spacer ring 5 respectively); the guide sleeve 2 is located above the valve stem 3, the sealing rings 4 and the spacer rings 5 are located in the middle of the valve stem 3, and the protective cover 8 is located below the valve stem 3. A connecting sleeve 6 is installed on the valve stem 3 and between the sealing rings 4, the spacer rings 5 and the valve body 1. The connecting sleeve 6 is connected upward to the guide sleeve 2 and downward to the protective cover 8. A sealing piece 7 is installed on the valve stem 3 and between the connecting sleeve 6 and the protective cover 8. The valve stem 3 is connected to a power driving source and moves up and down longitudinally.

[0015] The outer shape of the sealing piece 7 is in a lip shape, which can tightly hold the valve stem, has better sealing performance, and can better scrape off impurities such as corrosive particulate matters attached to the valve stem. There is a groove 61 on the connecting sleeve 6 and at the connection with the sealing piece 7. One side (part) of the sealing piece 7 (with a softer material) is embedded and press - fitted into this groove 61, which plays a role in fixing the sealing piece and can increase the extraction force of the sealing piece. The outer end of the protective cover 8 is bent outward and downward to be connected to the connecting sleeve 6 (by welding), which further enhances its sealing performance. The sealing piece 7 is made of PTFE (polytetrafluoroethylene) plastic material, and the connecting sleeve 6 is made of stainless steel material, effectively preventing the connecting sleeve and the sealing piece from rusting. Exhaust holes are provided on both the valve body 1 and the spacer ring 5 for timely exhausting the slightly rising exhaust gas.

[0016] The sealing working principle of this exhaust gas recirculation valve: When the exhaust gas enters the inside of the valve body 1, it will successively pass through the multiple seals and anti - corrosion effects of the sealing piece, the connecting sleeve, the sealing rings and the spacer rings, and a very small amount of exhaust gas is discharged from the exhaust holes on the valve body 1 and the spacer ring 5. Thus, it prevents the exhaust gas from contacting the guide sleeve 6 for a long time, avoids causing the valve stem 7 to get stuck, and prevents the inner diameter of the guide sleeve from becoming smaller when the exhaust gas passes through the guide sleeve 6, and the situation of accumulation occurring inside the guide sleeve, which may lead to the suspension of the operation of the exhaust gas recirculation valve system, improving the working stability and efficiency.

[0017] The above has described the embodiments of the present utility model in detail with reference to the drawings, but the present utility model is not limited to the above - mentioned embodiments. Within the knowledge scope of those of ordinary skill in the technical field, various changes can be made without departing from the purpose of the present utility model.

Claims

1. The multiple sealing mechanism of the exhaust gas recirculation valve includes a valve body, a valve stem, a sealing ring and a spacer, a guide sleeve, and a protective cover, and is characterized by: The guide sleeve is located at the upper position of the valve stem, the sealing ring and the spacer are located at the middle position of the valve stem, and the protective cover is located at the lower position of the valve stem. A connecting sleeve is installed on the valve stem and between the sealing ring, the spacer and the valve body. The connecting sleeve is connected to the guide sleeve upward and to the protective cover downward. A sealing sheet is installed on the valve stem and between the connecting sleeve and the protective cover.

2. The multiple sealing mechanism of the exhaust gas recirculation valve according to claim 1, characterized in that: The sealing sheet has a lip shape.

3. The multiple sealing mechanism of the exhaust gas recirculation valve according to claim 1 or 2, characterized in that: A groove is provided on the connecting sleeve and at the joint with the sealing sheet, and one side edge of the sealing sheet is embedded and pressed into the groove.

4. The multiple sealing mechanism of the exhaust gas recirculation valve according to claim 1 or 2, characterized in that: The outer end of the protective cover is bent outward and downward and connected to the connecting sleeve.

5. The multiple sealing mechanism of the exhaust gas recirculation valve according to claim 1, characterized in that: The sealing sheet is made of PTFE plastic material, and the connecting sleeve is made of stainless steel.

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