Exhaust gas recirculation valve
By using plastic materials to manufacture the lower shell and combining the design of stainless steel bushings and inserts, the problem of corrosion under the shell under the exhaust gas recirculation valve is solved, ensuring the normal operation and safety of the engine.
Patent Information
- Application Number
- CN202421106632.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-21
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-05-21
AI Technical Summary
The lower shell of the existing exhaust gas recirculation valve is easily corroded by chlorine-containing condensate, causing corrosive substances to enter the bushing of the upper shell, causing stagnation, affecting the operation and safety of the engine.
The lower shell is made of plastic material, and a stainless steel bushing and insert are installed between the upper shell and the lower shell to ensure stable connection and prevent corrosion from entering the bushing. At the same time, the actuator drive assembly is used to control the axial direction of the valve stem. Move to reduce the risk of corrosion.
It improves the corrosion resistance of the lower case, prevents stagnation, ensures the normal operation of the engine, and enhances safety.
Smart Images
Figure CN222208111U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of automobile parts, in particular to an exhaust gas recirculation valve. Background Art
[0002] The exhaust gas recirculation valve, also known as the EGR valve, introduces a portion of the exhaust gas into the intake system and re-enters the cylinder for combustion together with fresh air or mixed gas, thereby reducing the temperature and pressure of the combustion chamber, reducing the generation of NOx, improving engine efficiency, protecting the engine and improving fuel efficiency. With the gradual maturity of hybrid applications, more condensed water is generated after engine combustion, and the repeated use of non-standard gasoline and engine oil in the market has put forward higher requirements for the corrosion resistance of the existing EGR valve. The lower shell part of the current EGR valve that is in direct contact with the exhaust gas is generally made of aluminum alloy, which is easily corroded by chlorine-containing condensed water. Corrosive substances can easily enter the bushing in the upper shell, causing the EGR valve to corrode and stagnate, the engine to run poorly, and the fault light to light up, posing certain safety hazards. Utility Model Content
[0003] In view of the deficiencies of the prior art, the purpose of the utility model is to provide an exhaust gas recirculation valve to solve the technical problem in the prior art that the lower shell part of the exhaust gas recirculation valve is easily corroded, resulting in the EGR valve being stuck.
[0004] To solve the above technical problems, the utility model provides an exhaust gas recirculation valve, including an upper shell, a lower shell, a valve stem and a bushing, a first installation cavity is provided in the upper shell, the first installation cavity forms a first opening at the bottom end of the upper shell, a second installation cavity is provided in the lower shell, the second installation cavity forms a second opening at the top end of the lower shell, the upper shell is connected above the lower shell, the bottom end of the upper shell is connected to the top end of the lower shell and the first opening and the second opening are coaxially arranged, the upper part of the valve stem is located in the first installation cavity, the lower part of the valve stem is located in the second installation cavity, an actuator drive assembly for controlling the axial movement of the valve stem is connected in the first installation cavity, the bushing is sleeved on the valve stem and is located in the first installation cavity, and the lower shell is made of plastic material.
[0005] After adopting the above structure, the exhaust gas recirculation valve of the utility model has the following advantages: when the exhaust gas recirculation valve is working, the valve stem is driven by the actuator drive assembly to move axially in the first installation cavity and the second installation cavity, the valve stem moves along the bushing, and the lower shell part is in direct contact with the exhaust gas. The material of the lower shell is changed to plastic, which improves the corrosion resistance of the lower shell, and it is not easy for corrosive substances to enter the bushing, thereby preventing the exhaust gas recirculation valve from getting stuck, ensuring the normal operation of the engine, and improving safety.
[0006] As an improvement, a plurality of first lugs are connected to the upper shell, and a plurality of second lugs equal in number to the first lugs are connected to the lower shell, and each first lug is fixedly connected to one of the second lugs by a bolt; with this structure, the upper shell and the lower shell are stably connected by setting the first lugs and the second lugs.
[0007] As an improvement, a plurality of stainless steel inserts isolated from the second mounting cavity are integrally formed on the lower shell. This structure facilitates the connection of the lower shell with other internal structures of the automobile while ensuring the corrosion resistance of the lower shell, thereby improving the stability of the connection.
[0008] As an improvement, the stainless steel insert includes a threaded sleeve and a valve seat.
[0009] As an improvement, a stainless steel bushing is connected to the second opening, and the stainless steel bushing includes a connecting portion and a protrusion. The connecting portion is connected to the second opening, the protrusion is connected to the upper end surface of the connecting portion and is coaxially arranged with the connecting portion, the protrusion is exposed above the second opening, and a through hole that penetrates the protrusion and the connecting portion is provided on the stainless steel bushing, and the protrusion is inserted into the first opening. This structure is adopted to improve the stability of the connection between the upper shell and the lower shell.
[0010] As an improvement, the second installation cavity forms a third opening at the bottom end of the lower shell body, and the two opposite outer side walls of the lower part of the lower shell body are respectively integrally formed with a third lug, and each third lug is integrally formed with a stainless steel threaded sleeve; adopting this structure, by setting the third lug and the corresponding stainless steel threaded sleeve, the exhaust gas recirculation valve can be connected to other structures inside the car through the lower shell body.
[0011] As an improvement, the third opening is the intake side of the exhaust gas recirculation valve, and a first sealing ring is connected to the bottom end of the lower shell around the third opening; this structure improves the sealing performance of the third opening when the lower shell is connected to other structures.
[0012] As an improvement, a third mounting cavity is provided on the side wall of the second mounting cavity, and the third mounting cavity forms a fourth opening on the side wall of the lower shell body, and two opposite outer side walls of the lower shell body located at the fourth opening are respectively integrally formed with a fourth lug, and each fourth lug is integrally formed with a stainless steel threaded sleeve; by adopting this structure, by setting the fourth lug and the corresponding stainless steel threaded sleeve, the exhaust gas recirculation valve can be connected to other internal structures of the automobile through the lower shell body.
[0013] As an improvement, the fourth opening is the exhaust gas recirculation valve outlet side, and a second sealing ring is connected to the side wall of the lower shell around the fourth opening; this structure improves the sealing performance of the fourth opening when the lower shell is connected to other structures. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a sectional view of the whole of the utility model.
[0015] Figure 2 It is a schematic diagram of the overall exploded structure of the utility model.
[0016] Figure 3 It is a schematic diagram of the overall three-dimensional structure of the utility model.
[0017] Figure numerals: 1, upper shell; 2, lower shell; 3, valve stem; 4, bushing; 5, first mounting cavity; 6, first opening; 7, second mounting cavity; 8, second opening; 9, actuator drive assembly; 10, first lug; 11, second lug; 12, bolt; 13, stainless steel insert; 14, stainless steel bushing; 141, connecting portion; 142, protrusion; 15, through hole; 16, third opening; 17, third lug; 18, first sealing ring; 19, third mounting cavity; 20, fourth opening; 21, fourth lug; 22, second sealing ring. DETAILED DESCRIPTION
[0018] The exhaust gas recirculation valve of the utility model is described in detail below with reference to the accompanying drawings.
[0019] like Figures 1 to 3 As shown, an exhaust gas recirculation valve comprises an upper shell 1, a lower shell 2, a valve stem 3 and a bushing 4, a first installation cavity 5 is provided in the upper shell 1, the first installation cavity 5 forms a first opening 6 at the bottom end of the upper shell 1, a second installation cavity 7 is provided in the lower shell 2, the second installation cavity 7 forms a second opening 8 at the top end of the lower shell 2, the upper shell 1 is connected above the lower shell 2, the bottom end of the upper shell 1 is connected to the top end of the lower shell 2 and the first opening 6 and the second opening 8 are coaxially arranged, that is, after the upper shell 1 is connected to the lower shell 2, the first opening 6 and the second opening 8 are respectively closed by the lower shell 2 and the upper shell 1, and the first installation cavity 5 and the second installation cavity 7 are connected through the first opening 6 and the second opening 8; specifically, as Figure 1 and Figure 2 As shown, a stainless steel bushing 14 is connected in the second opening 8, and the stainless steel bushing 14 includes a connecting portion 141 and a protruding portion 142. The connecting portion 141 is connected in the second opening 8, and the protruding portion 142 is connected to the upper end surface of the connecting portion 141 and is coaxially arranged with the connecting portion 141. The diameter of the protruding portion 142 is smaller than that of the connecting portion 141. The overall cross-section of the stainless steel bushing 14 is convex, and the protruding portion 142 is exposed above the second opening 8. The stainless steel bushing 14 is provided with a through hole 15 that penetrates the protruding portion 142 and the connecting portion 141, and the protruding portion 142 is inserted in the first opening 6. In this embodiment, the upper end surface of the connecting portion 141 is flush with the top end of the lower shell 2, and the bottom end of the upper shell 1 is against the upper end surface of the connecting portion 141.
[0020] like Figure 1As shown, the upper part of the valve stem 3 is located in the first installation cavity 5, and the lower part of the valve stem 3 is located in the second installation cavity 7. The first installation cavity 5 is connected with an actuator drive assembly 9 for controlling the axial movement of the valve stem 3. The bushing 4 is sleeved on the valve stem 3 and is located in the first installation cavity 5. The specific structures of the valve stem 3, the bushing 4 and the actuator drive assembly 9 are all existing technologies and are not repeated here. The middle part of the valve stem 3 passes through the through hole 15; the lower shell 2 is made of plastic material.
[0021] like Figure 2 As shown, a plurality of first lugs 10 are connected to the upper shell 1, and a plurality of second lugs 11 equal in number to the first lugs 10 are connected to the lower shell 2, and each first lug 10 is fixedly connected to one of the second lugs 11 by a bolt 12; in this embodiment, two first lugs 10 are arranged at the bottom end of the upper shell 1, and two second lugs 11 are arranged at the top end of the lower shell 2.
[0022] like Figure 1 and Figure 2 As shown, the lower shell 2 is integrally formed with a plurality of stainless steel inserts 13 isolated from the second installation cavity 7. That is, the stainless steel inserts 13 are not exposed in the second installation cavity 7. Therefore, even if the stainless steel inserts 13 are corroded by exhaust gas, the corrosive substances will not enter the bushing 4. According to the connection requirements of the exhaust gas recirculation valve in actual use, the stainless steel inserts 13 include a threaded sleeve and a valve seat. For example, in this embodiment, the second installation cavity 7 forms a third opening 16 at the bottom end of the lower shell 2, and the two opposite outer side walls of the lower part of the lower shell 2 are respectively integrally formed with a third lug 17, that is, Figure 1 A third lug 17 is provided on the left and right outer side walls of the lower part of the middle and lower shell body 2, and a stainless steel insert 13 is integrally formed on each third lug 17. The stainless steel insert 13 here is a stainless steel threaded sleeve, and the axial direction of the stainless steel threaded sleeve is parallel to the axial direction of the valve stem 3. The third opening 16 is the intake side of the exhaust gas recirculation valve, and a first sealing ring 18 is connected to the bottom end of the lower shell body 2 around the third opening 16.
[0023] In addition, if Figure 1 and Figure 2 As shown, a third mounting cavity 19 is provided on the side wall of the second mounting cavity 7, and the third mounting cavity 19 forms a fourth opening 20 on the side wall of the lower shell body 2. Two opposite outer side walls of the lower shell body 2 located at the fourth opening 20 are respectively integrally formed with a fourth lug 21. Specifically, the two fourth lugs 21 are respectively arranged on the front and rear side walls of the lower shell body 2 located at the fourth opening 20, and the fourth lug 21 on the front side is higher than the fourth lug 21 on the rear side. A stainless steel insert 13 is integrally formed on each fourth lug 21. The stainless steel insert 13 here is a stainless steel threaded sleeve, and the axial direction of the stainless steel threaded sleeve is arranged along the left and right direction. The fourth opening 20 is the exhaust gas recirculation valve outlet side, and a second sealing ring 22 is connected to the side wall of the lower shell body 2 around the fourth opening 20.
[0024] When the exhaust gas recirculation valve is working, the valve stem 3 is driven by the actuator drive assembly 9 to move axially in the first installation cavity 5 and the second installation cavity 7. The valve stem 3 moves along the bushing 4, and the lower shell 2 part is in direct contact with the exhaust gas. The material of the lower shell 2 is changed to plastic to improve the corrosion resistance of the lower shell 2. It is not easy for corrosive substances to enter the bushing 4, which prevents the exhaust gas recirculation valve from getting stuck, ensures the normal operation of the engine, and improves safety.
[0025] The implementation modes of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned one implementation mode, and all other embodiments obtained by those skilled in the art without making any creative work are within the scope of protection of the present invention.
Claims
1. An exhaust gas recirculation valve, characterized in that: The invention comprises an upper shell (1), a lower shell (2), a valve stem (3) and a bushing (4); the upper shell (1) is provided with a first installation cavity (5), the first installation cavity (5) forms a first opening (6) at the bottom end of the upper shell (1); the lower shell (2) is provided with a second installation cavity (7), the second installation cavity (7) forms a second opening (8) at the top end of the lower shell (2); the upper shell (1) is connected to the top of the lower shell (2); the bottom end of the upper shell (1) is connected to the top end of the lower shell (2) so that the first opening (6) and the second opening (8) are coaxially arranged; the upper part of the valve stem (3) is located in the first installation cavity (5), the lower part of the valve stem (3) is located in the second installation cavity (7); the first installation cavity (5) is connected with an actuator drive assembly (9) for controlling the axial movement of the valve stem (3); the bushing (4) is sleeved on the valve stem (3) and is located in the first installation cavity (5); the lower shell (2) is made of plastic material.
2. The exhaust gas recirculation valve according to claim 1, characterized in that: The upper shell (1) is connected to a plurality of first lugs (10), and the lower shell (2) is connected to a plurality of second lugs (11) whose number is equal to the first lugs (10), and each of the first lugs (10) is fixedly connected to one of the second lugs (11) by means of bolts (12).
3. The exhaust gas recirculation valve according to claim 1, characterized in that: A plurality of stainless steel inserts (13) isolated from the second mounting cavity (7) are integrally formed on the lower shell (2).
4. The exhaust gas recirculation valve according to claim 3, characterized in that: The stainless steel insert (13) comprises a threaded sleeve and a valve seat.
5. The exhaust gas recirculation valve according to claim 1, characterized in that: A stainless steel bushing (14) is connected to the second opening (8), and the stainless steel bushing (14) comprises a connecting portion (141) and a protruding portion (142). The connecting portion (141) is connected to the second opening (8), and the protruding portion (142) is connected to the upper end surface of the connecting portion (141) and is coaxially arranged with the connecting portion (141). The protruding portion (142) is exposed above the second opening (8). A through hole (15) is provided on the stainless steel bushing (14) that passes through the protruding portion (142) and the connecting portion (141), and the protruding portion (142) is inserted into the first opening (6).
6. The exhaust gas recirculation valve according to claim 1, characterized in that: The second installation cavity (7) forms a third opening (16) at the bottom end of the lower shell (2), and two opposite outer side walls of the lower part of the lower shell (2) are respectively integrally formed with a third lug (17), and each of the third lugs (17) is integrally formed with a stainless steel threaded sleeve.
7. The exhaust gas recirculation valve according to claim 6, characterized in that: The third opening (16) is the air intake side of the exhaust gas recirculation valve, and the bottom end of the lower shell (2) is connected to a first sealing ring (18) surrounding the third opening (16).
8. The exhaust gas recirculation valve according to claim 1, characterized in that: A third installation cavity (19) is provided on the side wall of the second installation cavity (7), and the third installation cavity (19) forms a fourth opening (20) on the side wall of the lower shell (2). Two opposite outer side walls of the lower shell (2) located at the fourth opening (20) are respectively integrally formed with a fourth lug (21), and each of the fourth lugs (21) is integrally formed with a stainless steel threaded sleeve.
9. The exhaust gas recirculation valve according to claim 8, characterized in that: The fourth opening (20) is the exhaust gas recirculation valve outlet side, and a second sealing ring (22) is connected to the side wall of the lower shell (2) surrounding the fourth opening (20).