Temperature-resistant EGR (Exhaust Gas Recirculation) valve body

Abstract

The utility model relates to the technical field of EGR valve bodies, in particular to a temperature-resistant EGR valve body which comprises a valve body and a sealing seat arranged at the lower end of the valve body, a ventilation assembly is arranged at the end, close to the valve body, of the inner wall of the sealing seat, and the ventilation assembly comprises a ventilation pipe arranged at one end of the inner wall of the sealing seat. The first sealing gasket is arranged to be in a step shape, multi-layer sealing can be achieved, the sealing performance is improved, the inner cone gasket, the first sealing gasket and the second sealing gasket are all made of polytetrafluoroethylene, polytetrafluoroethylene has excellent high-temperature resistance and can work within the temperature range from-190 DEG C to 260 DEG C, polytetrafluoroethylene further has excellent chemical corrosion resistance, and the sealing performance is improved. The sealing gasket is suitable for corrosive media, corrosive gas can be prevented from corroding the sealing gasket, and the problem that an existing EGR is poor in sealing performance in the high-temperature state is solved.

Description

Technical Field

[0001] This utility model relates to the field of EGR valve body technology, and in particular to a temperature-resistant EGR valve body. Background Technology

[0002] Exhaust gas recirculation (EGR) involves introducing a portion of exhaust gas into the intake manifold during engine operation. This gas mixes with fresh air or atomized air-fuel mixture before re-combustion in the engine cylinders. This method is currently an effective measure to reduce NOx emissions. However, excessive exhaust gas in the recirculation process can affect normal engine operation, especially at idle, low speeds and light loads, and when the engine is cold. In these conditions, the recirculated exhaust gas will significantly reduce engine performance. Therefore, an EGR valve is incorporated into the exhaust gas recirculation system to automatically adjust the amount of exhaust gas participating in the recirculation based on changes in engine operating conditions. To achieve both reduced vehicle emissions and sustained engine performance, the control of the EGR valve requires extremely precise control.

[0003] However, existing EGRs have poor sealing performance at high temperatures, which can easily cause the sealing rings inside the EGR valve body to fail. Utility Model Content

[0004] In order to overcome the defects of the prior art mentioned above, the inventors conducted in-depth research and, after a great deal of creative work, completed this utility model.

[0005] Specifically, the technical problem to be solved by this utility model is to provide a temperature-resistant EGR valve body to solve the technical problem that the existing EGR has poor sealing performance at high temperatures, and that high temperatures easily cause the sealing ring in the EGR valve body to fail.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] A temperature-resistant EGR valve body includes a valve body and a sealing seat located at the lower end of the valve body. A venting assembly is provided on the inner wall of the sealing seat near the valve body. The venting assembly includes a vent pipe located at one end of the inner wall of the sealing seat, with an inner conical pad inserted into the inner wall of the vent pipe. A sealing assembly is provided on the inner wall of the sealing seat near the venting assembly. A fixing plate is provided at the middle of the inner wall of the sealing seat, with an adjusting rod inserted at the middle of the fixing plate. A spring is sleeved on the outer wall of the adjusting rod, and an elastic ring is provided at the end of the adjusting rod near the venting assembly. A ventilation plate is inserted into the inner wall of the sealing seat, with a ventilation hole at the middle of the ventilation plate. A second sealing plate is provided at the end of the adjusting rod away from the venting assembly, with a connecting plate connected to one side of the second sealing plate. A second sealing gasket is fixedly inserted into the inner wall of the end of the sealing seat away from the venting assembly.

[0008] As an improved technical solution, the inner cone pad has a frustum-shaped inner cavity, and the radius of the inner cone pad decreases from the outside to the inside. The radius of the elastic ring is the same as the maximum inner cavity radius of the inner cone pad.

[0009] As an improved technical solution, the sealing assembly includes a first sealing plate fixedly inserted into the inner wall of the sealing seat, a first sealing gasket fixedly sleeved on the upper end of the outer wall of the adjusting rod, the four sides of the first sealing gasket near the first sealing plate being stepped, the inner cavity of the first sealing plate having a stepped groove that mates with the first sealing gasket, and the middle of the first sealing plate having a through hole.

[0010] As an improved technical solution, the front and rear ends of the spring are respectively fixedly connected to the first sealing gasket and the fixing plate, and the adjusting rod is movably inserted into the middle end of the adjusting rod.

[0011] As an improved technical solution, a disc is fixedly sleeved on one end of the outer wall of the adjusting rod near the ventilation plate, and the radius of the disc is larger than the radius of the ventilation hole.

[0012] As an improved technical solution, the inner cone gasket, the first sealing gasket, and the second sealing gasket are all made of polytetrafluoroethylene.

[0013] As an improved technical solution, a cooling pipe is provided on the lower outer wall of the sealing seat, and mounting blocks are provided at the four corners of the lower end of the cooling pipe.

[0014] After adopting the above technical solution, the beneficial effects of this utility model are:

[0015] In this invention, the first sealing gasket is designed in a stepped shape, which can achieve multi-layer sealing and increase its sealing performance. The inner cone gasket, the first sealing gasket, and the second sealing gasket are all made of polytetrafluoroethylene (PTFE). PTFE has excellent high-temperature resistance and can work in a temperature range of -190℃ to +260℃. PTFE also has excellent chemical corrosion resistance and is suitable for corrosive media. It can prevent corrosive gases from corroding the sealing gasket and solve the problem of poor sealing performance of existing EGRs at high temperatures. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0017] Figure 1 This is a schematic diagram of the overall three-dimensional structure of a temperature-resistant EGR valve body according to the present invention;

[0018] Figure 2 This is a front cross-sectional three-dimensional structural diagram of a temperature-resistant EGR valve body according to the present invention.

[0019] Figure 3 This is a three-dimensional cross-sectional view of the ventilation component of a temperature-resistant EGR valve body according to this utility model.

[0020] Figure 4 This is a three-dimensional structural diagram of the sealing assembly of a temperature-resistant EGR valve body according to the present invention.

[0021] In the diagram: 1. Valve body; 2. Sealing seat; 3. Venting assembly; 31. Venting pipe; 32. Inner cone gasket; 4. Sealing assembly; 41. First sealing plate; 42. First sealing gasket; 43. Through hole; 5. Fixing plate; 6. Adjusting rod; 7. Spring; 8. Elastic ring; 9. Ventilation plate; 10. Ventilation hole; 11. Disc; 12. Second sealing gasket; 13. Second sealing plate; 14. Connecting plate; 15. Cooling pipe; 16. Mounting block. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0024] Meanwhile, the meaning of "and / or" or "the / or" appearing throughout the text is that it includes three options. Taking "A and / or B" as an example, it includes option A, option B, or an option that satisfies both A and B.

[0025] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0026] like Figures 1-4 As shown in the figure, this embodiment provides a temperature-resistant EGR valve body, including a valve body 1 and a sealing seat 2 located at the lower end of the valve body 1. A venting component 3 is provided on the inner wall of the sealing seat 2 near the valve body 1. The venting component 3 includes a vent pipe 31 located on one end of the inner wall of the sealing seat 2. An inner cone pad 32 is inserted into the inner wall of the vent pipe 31. A sealing component 4 is provided on the inner wall of the sealing seat 2 near the venting component 3. A fixing plate 5 is provided in the middle of the inner wall of the sealing seat 2. An adjusting rod 6 is inserted in the middle of the fixing plate 5. A spring 7 is sleeved on the outer wall of the adjusting rod 6. An elastic ring 8 is provided on the end of the adjusting rod 6 near the venting component 3. A ventilation plate 9 is inserted into the inner wall of the sealing seat 2. A ventilation hole 10 is opened in the middle of the ventilation plate 9. A second sealing plate 13 is provided on the end of the adjusting rod 6 away from the venting component 3. A connecting plate 14 is connected to one side of the second sealing plate 13. A second sealing gasket 12 is fixedly inserted into the inner wall of the end of the sealing seat 2 away from the venting component 3.

[0027] The inner cavity of the inner cone pad 32 is shaped like a frustum, and the radius of the inner cavity of the inner cone pad 32 decreases from the outside to the inside. The radius of the elastic ring 8 is the same as the maximum inner cavity radius of the inner cone pad 32.

[0028] The sealing assembly 4 includes a first sealing plate 41 fixedly inserted into the inner wall of the sealing seat 2, a first sealing gasket 42 fixedly sleeved on the upper end of the outer wall of the adjusting rod 6, the four sides of the first sealing gasket 42 near the first sealing plate 41 are set in a stepped shape, the inner cavity of the first sealing plate 41 is provided with a stepped groove that matches the first sealing gasket 42, and the middle end of the first sealing plate 41 is provided with a through hole 43.

[0029] The front and rear ends of the spring 7 are fixedly connected to the first sealing gasket 42 and the fixing plate 5 respectively, and the adjusting rod 6 is movably inserted into the middle end of the adjusting rod 6.

[0030] A disc 11 is fixedly fitted on one end of the outer wall of the adjusting rod 6 near the ventilation plate 9. The radius of the disc 11 is larger than the radius of the ventilation hole 10.

[0031] The inner cone gasket 32, the first sealing gasket 42, and the second sealing gasket 12 are all made of polytetrafluoroethylene.

[0032] A cooling pipe 15 is provided on the lower outer wall of the sealing seat 2, and mounting blocks 16 are provided at the four corners of the lower end of the cooling pipe 15.

[0033] When there is no gas exchange, under the reverse force of spring 7, adjusting rod 6 slides along the middle of fixed plate 5, driving disc 11 to move towards ventilation plate 9 until disc 11 contacts ventilation plate 9. At this time, second sealing plate 13 is inserted into second sealing gasket 12, and the outer wall of connecting plate 14 near sealing seat 2 is in contact with sealing seat 2. First sealing gasket 42 is movably inserted into through hole 43. Since first sealing gasket 42 is set in a stepped shape, multi-layer sealing can be achieved, thus the sealing effect of first sealing gasket 42 is better, and during the movement of adjusting rod 6... As the elastic ring 8 gradually inserts into the inner cone gasket 32, it deforms, making the elastic ring 8 fit more closely to the inner wall of the inner cone gasket 32 ​​in a static state, thus increasing its sealing effect. Through the above-mentioned multi-stage sealing, the overall sealing performance of the device is improved. The inner cone gasket 32, the first sealing gasket 42, and the second sealing gasket 12 are all made of polytetrafluoroethylene (PTFE). PTFE has excellent high-temperature resistance and can work in a temperature range of -190℃ to +260℃. PTFE also has excellent chemical corrosion resistance and is suitable for corrosive media, which can prevent corrosive gases from corroding the sealing gasket.

[0034] It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. Furthermore, it should be understood that after reading the technical description of this utility model, those skilled in the art can make various alterations, modifications, and / or variations to this utility model, and all such equivalent forms also fall within the scope of protection defined by the appended claims.

Claims

1. A temperature-resistant EGR valve body, comprising a valve body (1) and a sealing seat (2) disposed at the lower end of the valve body (1), characterized in that: A venting assembly (3) is provided at one end of the inner wall of the sealing seat (2) near the valve body (1). The venting assembly (3) includes a vent pipe (31) located at one end of the inner wall of the sealing seat (2). An inner cone pad (32) is inserted into the inner wall of the vent pipe (31). A sealing assembly (4) is provided at one end of the inner wall of the sealing seat (2) near the venting assembly (3). A fixing plate (5) is provided at the middle of the inner wall of the sealing seat (2). An adjusting rod (6) is inserted into the middle of the fixing plate (5). The outer wall of the adjusting rod (6) is sleeved with... A spring (7) is provided. An elastic ring (8) is provided at the end of the adjusting rod (6) near the ventilation component (3). A ventilation plate (9) is inserted into the inner wall of the sealing seat (2). A ventilation hole (10) is opened in the middle of the ventilation plate (9). A second sealing plate (13) is provided at the end of the adjusting rod (6) away from the ventilation component (3). A connecting plate (14) is connected to one side of the second sealing plate (13). A second sealing gasket (12) is fixedly inserted into the inner wall of the end of the sealing seat (2) away from the ventilation component (3).

2. The temperature-resistant EGR valve body according to claim 1, characterized in that: The inner cavity of the inner cone pad (32) is shaped like a frustum. The radius of the inner cavity of the inner cone pad (32) decreases from the outside to the inside. The radius of the elastic ring (8) is the same as the maximum inner cavity radius of the inner cone pad (32).

3. The temperature-resistant EGR valve body according to claim 1, characterized in that: The sealing assembly (4) includes a first sealing plate (41) fixedly inserted into the inner wall of the sealing seat (2), a first sealing gasket (42) fixedly sleeved on the upper end of the outer wall of the adjusting rod (6), the four sides of the first sealing gasket (42) near the first sealing plate (41) are set in a stepped shape, the inner cavity of the first sealing plate (41) is provided with a stepped groove that matches the first sealing gasket (42), and a through hole (43) is provided in the middle of the first sealing plate (41).

4. The temperature-resistant EGR valve body according to claim 1, characterized in that: The spring (7) is fixedly connected to the first sealing gasket (42) and the fixing plate (5) at its front and rear ends respectively, and the adjusting rod (6) is movably inserted into the middle end of the adjusting rod (6).

5. The temperature-resistant EGR valve body according to claim 1, characterized in that: A disc (11) is fixedly fitted on one end of the outer wall of the adjusting rod (6) near the ventilation plate (9), and the radius of the disc (11) is larger than the radius of the ventilation hole (10).

6. The temperature-resistant EGR valve body according to claim 1, characterized in that: The inner cone gasket (32), the first sealing gasket (42), and the second sealing gasket (12) are all made of polytetrafluoroethylene.

7. The temperature-resistant EGR valve body according to claim 1, characterized in that: The lower outer wall of the sealing seat (2) is provided with a cooling pipe (15), and each of the four corners of the lower end of the cooling pipe (15) is provided with a mounting block (16).

Images