Exhaust gas recirculation valve

Abstract

The utility model relates to the technical field of automobile parts, especially relates to a waste gas recirculation valve, including base and being located on base's valve body, be equipped with diaphragm assembly in the valve body, form vacuum chamber between diaphragm assembly and valve body, the upper end of valve body is equipped with the breather pipe connected with vacuum chamber, be equipped with the air inlet and the air outlet that can with the air inlet intercommunication on base, the valve rod assembly that can open and close the air outlet is slidably equipped with in the valve body, diaphragm assembly includes upper diaphragm holder, lower diaphragm holder and the diaphragm body between both, and upper diaphragm holder, lower diaphragm holder and diaphragm body are connected through riveting, valve rod assembly includes valve rod body, is equipped with the mounting hole of valve rod body installation on lower diaphragm holder, the top of valve rod body is equipped with welding part, and the mounting hole is connected through welding with welding part, the utility model has the advantages of providing structure integration, simplifying the waste gas recirculation valve of assembly.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, specifically to an exhaust gas recirculation valve. Background Technology

[0002] The exhaust gas recirculation valve, also known as the EGR valve, plays a role in regulating and controlling the flow of recirculated exhaust gas in the engine's exhaust gas recirculation system (EGR system). The main function of the EGR valve is to adjust the opening and closing of its outlet by changing the vacuum level in the vacuum chamber, thereby regulating the flow of exhaust gas to mix with fresh air and return it to the cylinders for recirculation, thus reducing NOx emissions.

[0003] Traditional EGR valves typically employ a sealing structure between the valve stem and diaphragm using a riveting process where the valve stem is deformed at its tip and riveted to a flat pad above the diaphragm. This further deforms the diaphragm under the riveting force to ensure a seal at the diaphragm. However, this riveting structure is prone to bending and deformation due to excessive riveting force during the riveting process. Additionally, the guide sleeve used to guide the valve stem is damaged by rotational friction, affecting the overall valve performance. To address these issues, an EGR valve diaphragm and valve stem assembly structure, disclosed in CN204267181U, is described. This structure features a locking nut threaded onto the valve stem within the vacuum chamber. A small diaphragm pad is fitted onto the valve stem between the locking nut and the flat pad above the diaphragm. A flat section is provided in the middle of the valve stem, simplifying the assembly process, making tooling easy to manufacture, and preventing damage to other parts of the EGR valve.

[0004] However, during the use of the above-mentioned document, it was found that the assembly required loose parts such as locking nuts, flat washers, and small diaphragm gaskets, which increased the cost of parts procurement and storage. At the same time, the sealing effect was entirely determined by the tightening torque of the locking nuts. If the torque was insufficient (vibration loosened the seal), the diaphragm seal failed; if the torque was too large, the diaphragm would deform excessively, accelerating aging and cracking. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide an exhaust gas recirculation valve with integrated structure and simplified assembly, which addresses the shortcomings of the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a waste gas recirculation valve, comprising a base and a valve body disposed on the base, a diaphragm assembly disposed within the valve body, a vacuum chamber formed between the diaphragm assembly and the valve body, a vent pipe connected to the vacuum chamber at the upper end of the valve body, an air inlet and an air outlet communicating with the air inlet on the base, and a valve stem assembly slidably disposed within the valve body to open and close the air outlet, characterized in that: the diaphragm assembly comprises an upper diaphragm frame, a lower diaphragm frame, and a diaphragm body located between the two, the upper diaphragm frame, the lower diaphragm frame, and the diaphragm body are connected by riveting; the valve stem assembly comprises a valve stem body, the lower diaphragm frame is provided with a mounting hole for mounting the valve stem body, the top end of the valve stem body is provided with a welding part, and the mounting hole and the welding part are connected by welding.

[0007] By adopting the above technical solution, the valve stem body is welded to the lower diaphragm frame, which enables the overall structure to be integrated, thereby simplifying assembly and reducing the number of parts. The setting of the welding part of the valve stem body makes it easy for workers to perform welding. They only need to pass the valve stem body through the mounting hole on the lower diaphragm frame to weld the connection between the welding part and the mounting hole. At the same time, compared with the traditional riveting assembly method, this utility model can avoid riveting stress and protect the straightness of the valve stem by welding.

[0008] A further feature of this invention is that the upper diaphragm frame, the diaphragm body, and the lower diaphragm frame have several corresponding through holes along their respective circumferential directions on their end faces, and rivets are provided between each of the through holes.

[0009] The above technical solution employs a method where corresponding through holes are provided on the upper diaphragm frame, the diaphragm body, and the lower diaphragm frame to facilitate the installation of rivets and subsequent riveting.

[0010] A further feature of this invention is that a valve block is threadedly connected to the bottom of the valve stem body, the valve block is capable of opening and closing the air outlet, and a limiting boss is provided at the lower end of the valve stem body at the welded part.

[0011] The above technical solution is adopted: when the vent pipe is connected to negative pressure, the pressure in the vacuum chamber changes, causing the diaphragm to move upward, which in turn drives the valve stem body to move upward, causing the valve block to move upward, thus opening the outlet. Exhaust gas enters from the inlet and is discharged from the outlet to the engine for recycling. At the same time, the upper limit boss on the valve stem body makes it easy for the operator to install the valve stem body into the mounting hole, which serves as a positioning function.

[0012] A further feature of this invention is that the base is provided with a guide sleeve, and a guide hole is provided through the guide sleeve for the valve stem body to pass through.

[0013] The above technical solution, by setting the guide sleeve, can prevent the valve stem body from shifting during movement, thus affecting the performance.

[0014] A further feature of this invention is that an elastic element is provided inside the vacuum chamber, with one end of the elastic element abutting against the upper diaphragm frame and the other end abutting against the top of the vacuum chamber.

[0015] The above technical solution is adopted as follows: by setting the elastic element, when the vent pipe is connected to negative pressure, the diaphragm assembly moves upward, and the elastic element is compressed. When the vacuum chamber pressure returns to normal, the elasticity of the elastic element can drive the diaphragm assembly to reset smoothly, thereby driving the valve stem body and valve block to reset downward, causing the valve block to close the air outlet.

[0016] A further feature of this invention is that the valve body includes an upper cover and a bottom cover, and the edges of the upper cover, the bottom cover, and the diaphragm body are connected by riveting.

[0017] The above technical solution involves connecting the top cover, diaphragm body, and bottom cover by riveting. The riveting, through plastic deformation, ensures that the edges of the three parts fit tightly together, forming a continuous, gapless sealing ring, thereby improving the sealing effect.

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0020] Figure 2 This is an exploded view of the present invention.

[0021] Figure 3 This is an exploded view of the diaphragm assembly of this utility model.

[0022] Figure 4 This is a schematic diagram of the valve stem assembly structure of this utility model.

[0023] Figure 5 This is a cross-sectional view of the present invention.

[0024] Labeling: Base 1, Inlet 11, Outlet 12, Guide sleeve 13, Guide hole 131, Mounting lug 14, Valve body 2, Upper cover 21, Bottom cover 22, Vent pipe 23, Diaphragm assembly 3, Upper diaphragm frame 31, Diaphragm body 32, Lower diaphragm frame 33, Mounting hole 331, Through hole 34, Rivet 35, Vacuum chamber 4, Elastic element 41, Valve stem assembly 5, Valve stem body 51, Welded part 511, Limiting boss 512, Valve block 52. Detailed Implementation

[0025] In the accompanying drawings of this specific embodiment and the disclosed embodiments, only the structures involved in the disclosed embodiments are involved. Other structures can be referred to with ordinary design. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of this utility model, they are protected by patent law.

[0026] like Figure 1-5 The exhaust gas recirculation valve shown includes a base 1 and a valve body 2 disposed on the base 1. A diaphragm assembly 3 is disposed inside the valve body 2, and a vacuum chamber 4 is formed between the diaphragm assembly 3 and the valve body 2. A vent pipe 23 connected to the vacuum chamber 4 is provided at the upper end of the valve body 2. An air inlet 11 and an air outlet 12 that can communicate with the air inlet 11 are provided on the base 1. A valve stem assembly 5 that can open and close the air outlet 12 is slidably disposed inside the valve body 2. The diaphragm assembly 3 includes an upper diaphragm frame, a lower diaphragm frame 33, and a diaphragm body 32 located between the two. The upper diaphragm frame, the lower diaphragm frame 33, and the diaphragm body 32 are connected by riveting. The valve stem assembly 5 includes a valve stem body 51. The lower diaphragm frame 33 is provided with a mounting hole 331 for mounting the valve stem body 51. The top end of the valve stem body 51 is provided with a welding part 511. The mounting hole 331 and the welding part 511 are connected by welding.

[0027] like Figure 2-3 The upper diaphragm holder 31, the diaphragm body 32 and the lower diaphragm holder 33 shown are provided with a number of corresponding through holes 34 along their respective circumferential directions on their end faces, and rivets 35 are provided between each through hole 34.

[0028] like Figure 4 The valve stem body 51 shown has a valve block 52 threadedly connected to its bottom. The valve block 52 can open and close the air outlet 12. The valve stem body 51 has a limiting boss 512 located at the lower end of the welded part 511. Figure 2 The base 1 shown is provided with a guide sleeve 13, and a guide hole 131 for the valve stem body 51 to pass through is provided inside the guide sleeve 13. The base 1 is provided with symmetrical mounting lugs 14 on both sides.

[0029] like Figure 5 The vacuum chamber 4 shown is equipped with an elastic element 41, one end of which abuts against the upper diaphragm holder 31, and the other end abuts against the top of the vacuum chamber 4; as shown Figure 5 The valve body 2 shown includes an upper cover 21 and a bottom cover 22, and the edges of the upper cover 21, the bottom cover 22 and the diaphragm body 32 are connected by riveting.

[0030] In use, the valve stem body 51 is welded to the lower diaphragm frame 33, which enables the overall structure to be integrated, thereby simplifying assembly and reducing the number of parts. The welding part 511 of the valve stem body 51 facilitates welding by the workers. The valve stem body 51 can be passed through the mounting hole 331 on the lower diaphragm frame 33 to weld the connection between the welding part 511 and the mounting hole 331. At the same time, compared with the traditional riveting assembly method, the welding method of this utility model can avoid riveting stress and protect the straightness of the valve stem body 51.

Claims

1. A waste gas recirculation valve, comprising a base and a valve body disposed on the base, wherein a diaphragm assembly is disposed within the valve body, a vacuum chamber is formed between the diaphragm assembly and the valve body, a vent pipe connected to the vacuum chamber is disposed at the upper end of the valve body, an inlet and an outlet communicating with the inlet are disposed on the base, and a valve stem assembly capable of opening and closing the outlet is slidably disposed within the valve body, characterized in that: The diaphragm assembly includes an upper diaphragm frame, a lower diaphragm frame, and a diaphragm body located between the two. The upper diaphragm frame, the lower diaphragm frame, and the diaphragm body are connected by riveting. The valve stem assembly includes a valve stem body. The lower diaphragm frame has mounting holes for mounting the valve stem body. The top of the valve stem body has a welding part. The mounting holes and the welding part are connected by welding.

2. The waste gas recirculation valve according to claim 1, characterized in that: The upper diaphragm frame, the diaphragm body, and the lower diaphragm frame have several corresponding through holes along their respective circumferential directions on their end faces, and rivets are provided between each of the through holes.

3. The waste gas recirculation valve according to claim 2, characterized in that: A valve block is threadedly connected to the bottom of the valve stem body. The valve block can open and close the air outlet. A limiting boss is provided at the lower end of the valve stem body at the welded part.

4. The waste gas recirculation valve according to claim 3, characterized in that: The base is provided with a guide sleeve, and a guide hole is provided through the guide sleeve for the valve stem body to pass through.

5. The exhaust gas recirculation valve according to claim 4, characterized in that: The vacuum chamber is equipped with an elastic element, one end of which abuts against the upper diaphragm frame, and the other end abuts against the top of the vacuum chamber.

6. The exhaust gas recirculation valve according to claim 5, characterized in that: The valve body includes an upper cover and a bottom cover, and the edges of the upper cover, the bottom cover, and the diaphragm body are connected by riveting.

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