Anti-clamping stagnation type sealing mechanism of exhaust gas recirculation valve

Abstract

The utility model discloses an anti-clamping stagnation type sealing mechanism of an exhaust gas recirculation valve, which is characterized in that a guide sleeve is arranged at the upper position of a valve rod, a sealing ring and a space ring are arranged at the middle position of the valve rod, a protective cover is arranged at the lower position of the valve rod, and a connecting sleeve is arranged on the valve rod and between the sealing ring and the space ring and a valve body. The connecting sleeve is upwards connected with the guide sleeve, the connecting sleeve is downwards connected with the protective cover, a pressing sleeve located at the upper position and a pressing pad located at the lower position are further installed between the connecting sleeve and the valve rod, the pressing sleeve is connected with the sealing ring, and the pressing pad is connected with the lower portion of the connecting sleeve. And a sealing piece is arranged on the valve rod and between the lower part of the connecting sleeve and the pressure pad. Water vapor can be prevented from being condensed and hung on the wall, and the sealing performance of the valve rod and the sealing ring is prevented from being affected by corrosion of the valve body; corrosion particles are prevented from entering the connecting sleeve and the guide sleeve. Through the multiple sealing modes of the sealing ring, the space ring, the connecting sleeve, the pressing sleeve, the pressing pad 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, it is necessary to control the exhaust gas recirculation amount 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 (a 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 causing the valve stem to get stuck during movement. The inner wall of the valve body is 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 at least solve one of the technical problems existing in the prior art, and provide an anti-sticking sealing mechanism for an exhaust gas recirculation valve with good sealing performance, anti-corrosion performance, and prevention of valve stem sticking.

[0005] To achieve the above purpose, the utility model provides the following technical solutions: an anti-sticking sealing mechanism for 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 pressure sleeve located above and a pressure pad located below are also installed between the connecting sleeve and the valve stem. The pressure sleeve is connected to the sealing ring, and the pressure pad is connected to the lower part of the connecting sleeve.

[0006] A sealing piece is installed on the valve stem and between the lower part of the connecting sleeve and the pressure pad to prevent corrosive particulate matter from entering the pressure sleeve and the guide sleeve. The outer shape of the sealing piece is in a lip shape. The sealing piece is made of PTFE plastic material, which can hold the valve stem tightly, has better sealing performance, and can better scrape off impurities such as corrosive particulate matter attached to the valve stem. The pressure sleeve is made of PPS engineering plastic material. 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. The pressure sleeve is provided to prevent the condensation of water vapor on the wall, which may cause accelerated corrosion and failure, effectively avoiding the corrosion of the valve body 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 pressure sleeve and the guide sleeve. Through the multiple sealing methods of the guide sleeve, the sealing ring, the spacer ring, the connecting sleeve, the pressure sleeve, the pressure pad and the sealing piece, the sealing performance and the anti-corrosion effect are improved, effectively preventing the jamming of the valve stem and improving the working stability and efficiency. 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 diagram of the whole of the present utility model;

[0010] Reference numerals: 1, valve body; 2, guide sleeve; 3, valve stem; 4, sealing ring; 5, spacer ring; 6, connecting sleeve; 7, pressure sleeve; 8, pressure pad; 9, sealing piece; 10, protective cover. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0011] 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 of 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.

[0012] In the description of the present utility model, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate 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 quantity of the indicated technical features or implicitly indicating 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.

[0013] Please refer to Figure 1, the present utility model provides a technical solution: an anti-sticking sealing 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 10 (the valve stem 3 is movably installed inside the valve body 1, and the guide sleeve 2, the sealing rings 4 and spacer rings 5, and the protective cover 10 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 spacer rings 5 are located in the middle of the valve stem 3, and the protective cover 10 is located below the valve stem 3. A connecting sleeve 6 is installed on the valve stem 3 and between the sealing rings 4 and 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 10. A compression sleeve 7 located above and a compression pad 8 located below are also installed between the connecting sleeve 6 and the valve stem 3. The compression sleeve 7 is connected to the sealing ring 4 (located below the spacer ring 5), and the compression pad 8 is connected to the lower part of the connecting sleeve 6. The valve stem 3 is connected to a power driving source and moves vertically up and down.

[0014] A sealing piece 9 is installed on the valve stem 3 and between the lower part of the connecting sleeve 6 and the compression pad 8 to prevent corrosive particulate matter from entering the compression sleeve and the guide sleeve; the outer shape of the sealing piece 9 is in a lip shape, and the sealing piece 9 is made of PTFE (polytetrafluoroethylene) plastic. The connecting sleeve 6 is made of stainless steel. The compression sleeve 7 is made of PPS (polyphenylene sulfide) engineering plastic, which effectively prevents the connecting sleeve and the compression sleeve from rusting. Exhaust holes are provided on both the valve body 1 and the spacer ring 5 to timely discharge the slightly rising exhaust gas.

[0015] The sealing and anti-sticking 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 compression sleeve and the compression pad, and the sealing rings and spacer rings. There is also a very small amount of exhaust gas 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 sticking of the valve stem 7, 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 cause the exhaust gas recirculation valve system to suspend working, and improves the working stability and efficiency.

[0016] The above has described the embodiments of the present utility model in detail with reference to the drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art in the said technical field, various changes can be made without departing from the gist of the present utility model.

Claims

1. The anti-stuck 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 in that: 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 pressing sleeve in the upper position and a pressing pad in the lower position are also installed between the connecting sleeve and the valve stem. The pressing sleeve is connected to the sealing ring, and the pressing pad is connected to the lower part of the connecting sleeve.

2. The anti-stuck sealing mechanism of the exhaust gas recirculation valve according to claim 1, characterized in that: A sealing sheet is arranged on the valve stem and between the lower part of the connecting sleeve and the pressure pad.

3. The anti-stuck sealing mechanism of the exhaust gas recirculation valve according to claim 2, characterized in that: The sealing sheet has a lip shape and is made of PTFE plastic.

4. The anti-stuck sealing mechanism of the exhaust gas recirculation valve according to claim 1 or 2, characterized in that: The compression sleeve is made of PPS engineering plastic material.

5. The anti-stuck sealing mechanism of the exhaust gas recirculation valve according to claim 4, characterized in that: The connecting sleeve is made of stainless steel.

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