Intake mixing valve and exhaust gas recirculation device

Abstract

The utility model discloses an air inlet mixing valve and an exhaust gas recirculation device. The air inlet mixing valve comprises a valve shell, a valve driving mechanism, a rotating shaft, a valve plate and an air inlet mixing pipe. Wherein the valve drive mechanism is arranged in the valve housing. One end of the rotating shaft is located in the valve shell and is in transmission connection with the valve driving mechanism, and the other end of the rotating shaft rotatably penetrates through the valve shell and extends into the air inlet mixing pipe in the radial direction of the air inlet mixing pipe. The valve plate is detachably arranged at the other end of the rotating shaft and rotatably located in a pipe cavity of the air inlet mixing pipe. The air inlet mixing pipe comprises an air inlet end, a circulating waste gas inlet end and an air outlet end, and the air inlet mixing pipe is detachably connected to one side of the valve shell. According to the air inlet mixing valve, the air inlet mixing pipe and the valve shell which are detachably connected are arranged, the air inlet mixing pipe and the valve shell can be independently produced and then assembled for use, the machining production process is simplified, the production efficiency is improved, and the cost and the weight of the air inlet mixing valve are reduced.

Description

Technical Field

[0001] This utility model relates to the field of waste gas recirculation technology, and in particular to an intake mixing valve and a waste gas recirculation device. Background Technology

[0002] To meet increasingly stringent emission regulations and improve fuel economy, EGR (Exhaust Gas Recirculation) systems have become an indispensable part of internal combustion engines. With the development of hybrid vehicles, fuel economy requirements are becoming increasingly stringent. Low-pressure EGR systems, due to their wider operating range and better fuel economy, have gained wider application. To address insufficient pressure differential in low-pressure EGR systems, an intake mixing valve (i.e., an EGR mixing valve) is typically introduced before the turbocharger compressor. Existing low-pressure EGR systems generally operate by circulating high-temperature exhaust gas, which is cooled by a cooler before reaching the intake mixing valve. There, it mixes with fresh air passing through the intake mixing valve before entering the engine through the turbocharger.

[0003] However, existing intake mixing valves typically use the throttle valve design platform. The intake mixing valve housing is usually made of cast aluminum and is integrally die-cast. For example, Chinese patent CN202220680U discloses an engine EGR valve body, in which the valve body is an integrally molded part made of powder metallurgy. In the existing technology, this type of integral intake mixing valve requires a lot of machining of the internal flow channels of the housing during the molding process. This method results in the problem that the die-cast intake mixing valve has large parts weight and high cost. Furthermore, when the internal parts of this type of integral intake mixing valve are damaged, the entire valve can only be replaced. For example, when the gears, motors, etc. inside the intake mixing valve are damaged, the entire intake mixing valve can only be replaced, resulting in high costs.

[0004] Therefore, the intake mixing valve in the existing technology is a one-piece metal valve body, which has the problems of high manufacturing cost and maintenance and replacement cost. Utility Model Content

[0005] The purpose of this invention is to solve the problem of high manufacturing and maintenance / replacement costs of the existing one-piece, metal-bodied intake mixing valve.

[0006] To address the aforementioned technical problems, this utility model discloses an intake mixing valve, which includes a valve housing, a valve drive mechanism, a rotating shaft, a valve plate, and an intake mixing pipe. The valve drive mechanism is housed within the valve housing. One end of the rotating shaft is located within the valve housing and is drively connected to the valve drive mechanism; the other end rotatably passes through the valve housing and extends into the intake mixing pipe along its radial direction. The valve plate is detachably mounted at the other end of the rotating shaft and rotatably located within the cavity of the intake mixing pipe. The intake mixing pipe includes an air intake end, a recirculated exhaust gas intake end, and an exhaust gas outlet end, and is detachably connected to one side of the valve housing.

[0007] By adopting the above technical solution, the intake mixing pipe is detachably connected to one side of the valve body. The intake mixing valve is configured as a separate, detachably connected intake mixing pipe and valve body. During production, the intake mixing pipe and valve body can be manufactured independently and then assembled, simplifying the die-casting and internal flow channel processing processes, improving production efficiency. Furthermore, each component can be optimized using different materials and manufacturing processes, thereby reducing cost and weight while ensuring performance. When a component or internal part of the intake mixing valve malfunctions, the faulty component can be replaced individually without replacing the entire valve body, thus reducing maintenance costs and time.

[0008] More preferably, the valve actuation mechanism is located on one side of the valve housing, and the intake mixing pipe is detachably connected to the outer side wall of the valve housing away from the valve actuation mechanism. A portion of the radial outer side wall of the valve housing abuts against a corresponding portion of the outer side wall of the intake mixing pipe and is detachably connected to each other via fastening members. A sealing ring is provided at the point where the valve housing abuts against the intake mixing pipe. Furthermore, a through hole for a rotating shaft to pass through is provided at the point where the valve housing abuts against the intake mixing pipe.

[0009] With the above technical solution, the valve body and the intake mixing pipe are detachably connected by fastening components after contact, and a sealing ring is set for sealing. The structure is simpler, disassembly and installation are more convenient, and the sealing performance is better.

[0010] More preferably, the intake mixing pipe and valve body are made of any one of the following materials: plastic, rubber, and lightweight alloy.

[0011] By adopting the above technical solution, lightweight materials such as plastics, rubber, and lightweight alloys are used to achieve lightweight design. The design also has high plasticity and design freedom, making it more suitable for structures such as valve bodies and pipelines. Furthermore, these materials also have better corrosion resistance and vibration absorption and noise reduction effects.

[0012] More preferably, a bushing is provided on the inner wall of the intake mixing pipe, in the area through which the shaft rotates, and the bushing is made of metal. The inner ring of the bushing is flush with the inner ring of the intake mixing pipe.

[0013] By adopting the above technical solution, the stability is higher and the deformation of the bushing is smaller after the bushing is installed.

[0014] This utility model also discloses an intake mixing valve, in which needle roller bearings and sliding bearings are arranged at intervals along the axial direction of a rotating shaft. The needle roller bearing is located at one end of the rotating shaft, with its outer ring fixed to the inner wall of a through hole, and one axial end of the needle roller bearing fixed to the outer wall of the rotating shaft. An inner bearing seal is provided inside the needle roller bearing, and the inner bearing seal is fixedly connected to the outer wall of the rotating shaft. The sliding bearing is located at the other end of the rotating shaft, between the side wall of the intake mixing pipe away from the valve housing and the outer wall of the other end of the rotating shaft.

[0015] With the above technical solution, needle roller bearings and sliding bearings are installed at both ends of the rotating shaft. After assembly, the stability is higher, making the axial positioning of the rotating shaft more accurate and preventing axial movement.

[0016] This utility model also discloses an intake mixing valve. Two bearings are arranged side-by-side at intervals near one end of the rotating shaft, close to the intake mixing pipe. The outer rings of the two bearings are fixed to the inner wall of a perforation, and the inner rings of the two bearings are fixed to the outer wall of the rotating shaft. The other end of the rotating shaft is rotatably disposed on the inner wall of the intake mixing pipe on the side away from the valve housing.

[0017] By adopting the above technical solution, the shaft is positioned by two bearings on one side. The bearing positioning structure is simpler and has lower assembly requirements, and the reliability of the single-sided support is also higher.

[0018] This utility model also discloses an exhaust gas recirculation device, including the intake mixing valve of any of the above-mentioned components, and further including an exhaust gas recirculation pipe, a recirculating exhaust gas cooler, an exhaust gas control valve, and a turbocharger compressor. The recirculating exhaust gas cooler and the exhaust gas control valve are disposed in the middle of the exhaust gas recirculation pipe. The inlet end of the exhaust gas recirculation pipe is connected to the exhaust port of the engine, and the outlet end is connected to the recirculating exhaust gas inlet end of the intake mixing pipe of the intake mixing valve. The air inlet end of the intake mixing pipe is connected to the outside air to allow air to enter the intake mixing pipe, and the air outlet end of the intake mixing pipe is connected to the air inlet of the engine.

[0019] By adopting the above technical solution, the exhaust gas recirculation device disclosed in this utility model can cool the exhaust gas of the engine and mix it with air before re-entering the engine, thereby reducing nitrogen oxide emissions, improving engine fuel efficiency, and enhancing engine operating stability. Attached Figure Description

[0020] Figure 1 A cross-sectional view of the intake mixing valve provided in this embodiment of the present invention, taken along the radial direction of the intake mixing pipe;

[0021] Figure 2 An exploded view of the intake mixing valve provided in this embodiment of the utility model;

[0022] Figure 3 A schematic diagram of the overall structure of the intake mixing valve provided in this embodiment of the utility model;

[0023] Figure 4 A partial cross-sectional view of the intake mixing pipe of the intake mixing valve provided in this embodiment of the utility model, wherein a bushing is provided inside.

[0024] Figure 5 A partial structural schematic diagram of the sector gear and reset elastic element of the intake mixing valve provided in this embodiment of the utility model;

[0025] Figure 6 A partial cross-sectional view of the reset elastic element of the intake mixing valve provided in this embodiment of the utility model, which is sleeved on the spring support surface;

[0026] Figure 7 A partial structural schematic diagram of the sector gear of the intake mixing valve in the reset state, provided for an embodiment of this utility model;

[0027] Figure 8 for Figure 7 A magnified view of part A in the middle;

[0028] Figure 9 A partial cross-sectional view of the intake mixing valve provided in this embodiment of the present invention, wherein the two ends of the rotating shaft are fixed by two bearings;

[0029] Figure 10 A partial cross-sectional view of a scheme in which one end of the shaft of the intake mixing valve provided in this embodiment of the utility model is fixed by two bearings;

[0030] Figure 11 A schematic diagram of the waste gas recirculation device provided in an embodiment of this utility model.

[0031] Explanation of reference numerals in the attached figures:

[0032] 100. Intake mixing valve;

[0033] 110. Valve housing;

[0034] 111. Limiting stop; 112. Lower stop stop; 113. Clearance; 114. Valve cover; 115. Second fastener;

[0035] 120. Valve drive mechanism;

[0036] 121. Drive motor; 122. Motor gear; 123. Intermediate gear; 1231. Meshing gear;

[0037] 124. Sector gear;

[0038] 1241. Sector-shaped meshing teeth; 1242. Gear shaft; 1243. Gear flange; 1244. Spring support surface; 1245. Magnet;

[0039] 125. Reset elastic element;

[0040] 1251. Upper leg; 1252. Lower leg;

[0041] 126. Hall sensor; 1261. Pin assembly;

[0042] 130. Shaft;

[0043] 131. Valve plate mounting groove; 132. First fastener;

[0044] 133. Needle roller bearing;

[0045] 1331. Inner seal ring of bearing;

[0046] 134. Sliding bearing; 135. Mounting bushing; 136. Plug; 137. Locating ring; 138. Moving end of rotating shaft;

[0047] 140. Valve plate;

[0048] 141. Fastener mounting slot;

[0049] 150. Intake mixing pipe;

[0050] 151. Bushing; 152. Air inlet end; 153. Circulating exhaust gas inlet end; 154. Exhaust gas outlet end;

[0051] 160. Sealing ring;

[0052] 170. Perforation;

[0053] 180. Fastening components;

[0054] 190. Crankcase pipe fitting;

[0055] 200. Exhaust gas recirculation pipe; 300. Circulating exhaust gas cooler; 400. Exhaust gas control valve; 500. Booster compressor; 600. Gas mixing pipe. Detailed Implementation

[0056] Exhaust gas recirculation (EGR) systems are commonly used in engines. Their main working principle is to cool a portion of the exhaust gas from the engine and then guide it back into the intake system. When the cooled exhaust gas is recirculated into the intake system, the fresh air and the recirculated exhaust gas are mixed through the intake mixing valve (also known as the EGR mixing valve) and then delivered to the engine. By controlling the mixing ratio of the recirculated exhaust gas and fresh air, the emission of nitrogen oxides from the engine can be effectively reduced.

[0057] However, existing intake mixing valves typically use the throttle valve design platform. The intake mixing valve housing is formed by one-piece die casting, and its material is generally metal. During the forming process, a lot of machining is required on the internal flow channels of the housing. This results in the problem of large part weight and high cost when die casting intake mixing valves. Furthermore, when the parts inside the intake mixing valve are damaged or have problems, the entire intake mixing valve must be replaced. Therefore, the intake mixing valve in the existing technology has the problem of high manufacturing cost and maintenance and replacement cost.

[0058] Example 1

[0059] To solve the above-mentioned technical problems, this utility model provides an intake mixing valve 100, which includes an intake mixing pipe 150 and a valve body 110 that are detachably connected. The intake mixing pipe 150 and the valve body 110 are separate and can be fixedly connected, which simplifies the production process and improves production efficiency. When a component or internal part of the intake mixing valve 100 fails, the faulty component can be replaced separately without replacing the entire valve body, further reducing maintenance costs and time.

[0060] The intake mixing valve 100 provided by this utility model will now be explained and described more clearly and completely.

[0061] This embodiment discloses an intake mixing valve 100. Please refer to [link / reference]. Figure 1 as well as Figure 2 , Figure 1 This is a cross-sectional view of the intake mixing valve 100 taken along the radial direction of the intake mixing pipe 150. Figure 2This is an exploded view of the intake mixing valve 100. The intake mixing valve 100 includes a detachably connected valve housing 110 and intake mixing pipe 150, as well as a valve drive mechanism 120, a rotating shaft 130, and a valve plate 140. The valve drive mechanism 120 is disposed within the valve housing 110. One end of the rotating shaft 130 is located within the valve housing 110 and is drively connected to the valve drive mechanism 120. The other end of the rotating shaft 130 rotatably passes through the valve housing 110 and extends into the intake mixing pipe 150 in the radial direction. The other end of the rotating shaft 130 can also rotate relative to the wall of the intake mixing pipe 150. The valve plate 140 is detachably disposed at the other end of the rotating shaft 130 and rotatably located within the cavity of the intake mixing pipe 150.

[0062] Specifically, the valve drive mechanism 120 can be any common drive mechanism, such as a drive motor and drive gear set, a drive motor and transmission belt set, or a drive motor and worm gear. The valve drive mechanism 120 can drive the rotating shaft 130 and valve plate 140 to rotate. The valve plate 140 is detachably fixed on the rotating shaft 130 and located in the cavity of the intake mixing pipe 150. In this way, the valve drive mechanism 120 can drive the rotating shaft 130 to rotate, and the rotating shaft 130 can control the air intake of the intake mixing pipe 150 by linking the valve plate 140 (i.e., the opening degree of the valve plate 140).

[0063] Furthermore, regarding the intake mixing valve 100 disclosed in this embodiment, please refer to... Figure 3 The intake mixing pipe 150 includes an air intake end 152, a recirculated exhaust gas intake end 153, and an exhaust end 154. Along the direction of fresh air intake within the intake mixing pipe 150, the air intake end 152 is located at the uppermost point of the intake mixing pipe 150, the recirculated exhaust gas intake end 153 is located downstream of the air intake end 152, and the exhaust end 154 is located at the lowermost point. A valve plate 140 is located within the cavity of the intake mixing pipe 150 between the air intake end 152 and the recirculated exhaust gas intake end 153. The valve plate 140 is normally open. When the engine is running, fresh air enters from the air intake end 152 and flows downstream within the cavity. Recirculated exhaust gas enters from the recirculated exhaust gas intake end 153 and mixes with the fresh air, then enters the engine from the exhaust end 154. Furthermore, this application also provides a crankcase pipe joint 190 on the downstream side of the intake mixing pipe 150. The crankcase pipe joint 190 is configured as a PCV pipe joint, which helps to discharge crankcase exhaust gas and can help solve the problem of engine oil emulsification.

[0064] When the engine is operating under low pressure, less recirculated exhaust gas enters from the recirculated exhaust gas inlet 153 within the intake mixing pipe 150 of the intake mixing valve 100. At this time, the valve drive mechanism 120 drives the rotating shaft 130 and valve plate 140 to rotate and reduces the opening degree of valve plate 140, thereby reducing the intake volume of fresh air. At this time, a negative pressure is formed at the valve plate 140, and the pressure difference is increased at the recirculated exhaust gas inlet 153 within the cavity of the intake mixing pipe 150, so as to better introduce recirculated exhaust gas and increase the intake volume of recirculated exhaust gas. It should be noted that because valve plate 140 is normally open, the larger the rotation angle of valve plate 140, the smaller the opening degree of valve plate 140 within the intake mixing pipe 150.

[0065] Further, please see Figure 1 and Figure 2 In the intake mixing valve 100 disclosed in this application, the valve drive mechanism 120 is disposed on one side of the valve housing 110. A valve cover 114 is also disposed on the side of the valve housing 110 away from the intake mixing pipe 150. The valve cover 114 is detachably fixed to the valve housing 110 by a second fastener 115. The second fastener 115 can be a common bolt, stud, self-tapping screw, etc. After the valve cover 114 and the valve housing 110 are fixedly connected as a whole, a sealed mounting cavity is formed inside, and the valve drive mechanism 120 is located in the mounting cavity.

[0066] Please refer to the above. Figure 1 as well as Figure 2 As can be seen, the intake mixing pipe 150 is detachably connected to the outer side wall of the valve housing 110, away from the valve drive mechanism 120. A portion of the radial outer side wall of the valve housing 110 abuts against the corresponding portion of the outer side wall of the intake mixing pipe 150, and they are detachably connected to each other via a fastening member 180. Similarly, the fastening member 180 can be a common threaded component such as a bolt or nut, or a fixing component such as a pin or shaft. To improve sealing performance, a sealing ring 160 is provided at the point where the valve housing 110 abuts against the intake mixing pipe 150. It should be noted that... (See also...) Figure 2 In this embodiment, since the fastening member 180 is used to fix the joint between the valve body 110 and the air intake mixing pipe 150, the fastening member 180 needs to have a large preload and installation strength after installation.

[0067] And see further. Figure 1 and Figure 2Because the valve drive mechanism 120 that drives the rotating shaft 130 and the valve plate 140 is located inside the valve housing 110, and the valve plate 140 is located inside the intake mixing pipe 150, a through hole 170 is provided at the part of the valve housing 110 that abuts against the intake mixing pipe 150 for the rotating shaft 130 to pass through. To improve the installation stability of the rotating shaft 130, the rotating shaft 130 can be installed in the through hole area. To further improve sealing, a sealing ring 160 is provided at the location where the valve housing 110 abuts against the intake mixing pipe 150 and where a perforation 170 is provided. This sealing ring 160 improves the sealing performance of both the connection between the valve housing 110 and the intake mixing pipe 150, and the connection between the rotating shaft 130 and the perforation 170. Furthermore, in this embodiment, to further enhance the sealing performance of the sealing ring 160, it is configured as an O-ring. It should be noted that, according to the intake mixing valve 100 provided in this embodiment, preferably two sealing rings 160 are provided at the connection between the valve housing 110 and the intake mixing pipe 150 (see reference [reference needed]). Figure 9 and Figure 10 Both sealing rings 160 are set as O-rings, and the two sealing rings 160 are different in shape and size. It should be understood that those skilled in the art can adjust or design the shape, number, size and material of the sealing rings according to actual needs to improve the sealing performance of the intake mixing valve 100. This embodiment does not make specific limitations in this regard.

[0068] With this design, the intake mixing pipe 150 is detachably connected to one side of the valve housing 110. The intake mixing valve 100 is configured as a separate, detachably connected intake mixing pipe 150 and valve housing 110. During production, the intake mixing pipe 150 and valve housing 110 can be manufactured independently for assembly, simplifying the die-casting and internal flow channel processing processes, improving production efficiency. Furthermore, each component can be optimized using different materials and manufacturing processes, reducing cost and weight while maintaining performance. When a component or internal part of the intake mixing valve 100 malfunctions, the faulty component can be replaced individually without replacing the entire valve body, thus reducing maintenance costs and time. Further, the valve housing 110 is detachably connected to the intake mixing pipe 150 via a fastening member 180 after contact, and a sealing ring 160 is provided for sealing. This results in a simpler structure, easier disassembly and installation, and better sealing performance.

[0069] Furthermore, the intake mixing valve 100 disclosed in this application also improves the materials of the valve body 110 and the intake mixing pipe 150, wherein the intake mixing pipe 150 and the valve body 110 are made of any one of plastic, rubber, or lightweight alloy. Using lightweight materials achieves a lightweight design and offers greater flexibility and design freedom, making it more suitable for valve bodies, pipes, and other structures. Furthermore, these materials also have better corrosion resistance and vibration absorption and noise reduction effects.

[0070] For example, both the valve body 110 and the intake mixing pipe 150 can be made of plastic materials, such as polyphenylene sulfide (PPS), polyphthalamide (PPA), nylon 6 (PA6), and nylon 66 (PA66), which have advantages such as high temperature resistance, corrosion resistance, good flame retardancy, and good rigidity. Alternatively, they can be made of rubber materials such as styrene-butadiene rubber (SBR), neoprene rubber (CR), and butyl rubber (IIR), which have advantages such as aging resistance, high temperature resistance, and corrosion resistance. Furthermore, the valve body 110 can be made of a lightweight alloy such as magnesium alloy, and the intake mixing pipe 150 can be made of plastic or rubber materials. Preferably, in this embodiment, both the valve body 110 and the intake mixing pipe 150 are made of plastic materials. Please refer to [link / reference]. Figure 3 , Figure 3 All components shown are made of lightweight materials, with the valve housing 110 and the intake mixing pipe 150 preferably made of plastic.

[0071] Furthermore, for example, when the intake mixing pipe 150 is made of water-absorbing materials such as nylon 6 (PA6) or nylon 66 (PA66), the water absorption may affect the dimensional accuracy of the product, which in turn affects the flow rate change of the valve plate 140 of the intake mixing pipe 150 under small opening conditions and the consistency of the pressure difference across the intake mixing valve 100. Therefore, a bushing 151 is provided on the inner wall of the intake mixing pipe 150 in the area through which the rotating shaft 130 passes. The bushing 151 is made of metal. Please refer to [link / reference]. Figure 4 The inner ring of bushing 151 is flush with the inner ring of intake mixing pipe 150. After setting bushing 151, the stability of intake mixing pipe 150 is higher, and the deformation of the inner ring of intake mixing pipe 150 is smaller.

[0072] Specifically, in this embodiment, the bushing 151 can be made of aluminum alloy, magnesium alloy, or other alloys, so that the inner ring of the bushing 151 is flush with the inner ring of the intake mixing pipe 150, thereby improving the performance and preventing interference between the valve plate 140 and the bushing 151, or between the bushing 151 and the intake mixing pipe 150, thus optimizing the intake passage within the intake mixing pipe 150. It should be noted that the bushing 151 also needs to be provided with a through hole 170 for the rotating shaft 130 to pass through.

[0073] This embodiment also discloses an intake mixing valve 100, please refer to [link / reference]. Figure 1 as well as Figure 2 The valve drive mechanism 120 includes a drive unit and a gear transmission assembly that are connected by transmission. The drive unit is fixedly installed on one side of the valve housing 110. The output end of the drive unit is connected to the gear transmission assembly. The power output end of the gear transmission assembly is connected to one end of the rotating shaft 130. The drive unit drives the gear transmission assembly to rotate and drives the rotating shaft 130 and the valve plate 140 to rotate synchronously.

[0074] Please see Figure 1 as well as Figure 2 The drive unit includes a drive motor 121, and the gear transmission assembly includes a motor gear 122, an intermediate gear 123, and a sector gear 124. The motor gear 122 is fixedly mounted on the power output end of the drive motor 121. The intermediate gear 123 includes two sets of meshing gears 1231 that are coaxial and spaced apart along the axial direction. The two sets of meshing gears 1231 mesh with the motor gear 122 and the sector gear 124, respectively. Specifically, in this embodiment, the motor gear 122, the intermediate gear 123, and the sector gear 124 form a two-stage speed-changing gear set. The drive motor 121 can be a DC motor, and one end of the rotating shaft 130 is fixedly connected to the sector gear 124.

[0075] Please see Figure 2 and Figure 5 The sector gear 124 includes an integrally formed sector meshing tooth 1241, a gear shaft 1242, and a gear flange 1243. One end of the rotating shaft 130 located inside the valve housing 110 is coaxially and fixedly connected to the gear shaft 1242. A reset elastic element 125 is sleeved on the gear shaft 1242. The gear flange 1243 extends toward the rotating shaft 130. The two legs of the reset elastic element 125 abut against the two sides of the gear flange 1243 respectively. Hall sensors 126 are spaced apart at the end of the sector gear 124 away from the rotating shaft 130. The Hall sensors 126 monitor the position of the valve plate 140 in real time and feed the signal back to the engine control unit for analysis.

[0076] Please see Figure 1 and Figure 2A magnet 1245 is disposed at one end of the sector gear 124 near the Hall sensor 126, and a pin assembly 1261 is electrically connected to the other end of the Hall sensor 126. When the sector gear 124 rotates, the magnet 1245 also rotates. The Hall sensor 126 monitors the position of the magnet 1245 and transmits the position signal through the pin assembly 1261. That is to say, the position of the magnet 1245 monitored by the Hall sensor 126 corresponds to the position of the valve plate 140. Its signal detection and transmission method is the same as that in the prior art, and will not be described in detail in this embodiment. It should be noted that the reset elastic element 125 can be a torsion spring, a reset spring, or other elastic element, and this embodiment does not specifically limit it.

[0077] See further Figure 5 The two sides of the gear retaining edge 1243 have different structural arrangements. The reset elastic element 125 has two supports, including an upper support 1251 and a lower support 1252. The lower support 1252 of the reset elastic element 125 abuts against the left side of the gear retaining edge 1243, and the upper support 1251 of the reset elastic element 125 abuts against the right side of the gear retaining edge 1243. In one implementation, the right side of the gear retaining edge 1243 is a vertical side, and the left side has an inclined abutment portion to prevent the reset elastic element 125 from shifting and to ensure the stability of the reset elastic element 125. Please refer to further details. Figure 6 When the reset elastic element 125 is sleeved on the gear shaft 1242 of the sector gear 124, the outer wall of the gear shaft 1242 provides a spring support surface 1244 for the reset elastic element 125 (e.g., Figure 6 (As shown in the dashed box), to provide a stable sleeve surface for the reset elastic element 125.

[0078] For more details, please see Figure 7 as well as Figure 7 Enlarged view of a portion of region A Figure 8 A limiting stop 111 is provided on the inner wall of the valve housing 110 near the sector gear 124, and a lower dead center stop 112 is provided on the inner wall of the valve housing 110 away from the sector gear 124. When the sector gear 124 is in its initial position, the valve plate 140 is in a normally open state within the intake mixing pipe 150, the reset elastic element 125 is in a relaxed state, and there is a gap 113 extending radially from the side of the sector meshing teeth 1241 of the sector gear 124 to the limiting stop 111. That is, a gap 113 is reserved between the side of the sector meshing teeth 1241 and the limiting stop 111. The lower dead center stop 112 corresponds to the limiting position when the sector gear 124 rotates to its maximum angle.

[0079] With this design, for example, in the event of a power outage, the reset elastic element 125 returns to its relaxed state. At this time, the valve plate 140, under the action of the reset elastic element 125, returns to its default stop point. When returning to the default stop point, there is a gap 113 extending radially along the sector gear 124 between the side of the sector meshing teeth 1241 and the limiting stop 111. That is to say, the side of the sector meshing teeth 1241 and the limiting stop 111 do not contact each other and maintain a certain gap 113, which serves as an inertial buffer distance when the sector gear 124 returns to its original position after power failure. This design can prevent the gear from experiencing excessive speed during power failure return, thus avoiding gear impact wear. It should be noted that after the sector gear 124 returns to its original position after power failure, the valve plate 140 located in the intake mixing pipe 150 is in a normally open state.

[0080] In the intake mixing valve 100 disclosed in this embodiment, one end of the rotating shaft 130 is coaxially fixed to the gear shaft 1242 of the sector gear 124. When the sector gear 124 rotates, it can drive the rotating shaft 130 and the valve plate 140 to rotate, and the position of the sector gear 124 (corresponding to the opening degree of the valve plate 140) is detected by the Hall sensor 126. For example, when the drive motor 121 rotates clockwise, the motor gear 122 rotates and drives the intermediate gear 123 and the sector gear 124 to rotate. The sector gear 124 drives the rotating shaft 130 and the valve plate 140 to rotate clockwise. At this time, the opening of the valve plate 140 increases and the reset elastic element 125 is compressed. When the drive motor 121 rotates counterclockwise, the motor gear 122 rotates and drives the intermediate gear 123 and the sector gear 124 to rotate. The sector gear 124 drives the rotating shaft 130 and the valve plate 140 to rotate counterclockwise. At this time, the opening of the valve plate 140 decreases and the compression of the reset elastic element 125 decreases. When the drive motor 121 is de-energized, the reset elastic element 125 resets and drives the sector gear 124 to rotate counterclockwise and reset. After reset, the valve plate 140 is in the normally open state. There is a gap 113 between the side of the sector meshing tooth 1241 and the limit stop 111, which serves as an inertial buffer distance when the sector gear 124 returns to its original position after de-energization, so as to avoid large rigid impact between the sector meshing tooth 1241 and the limit stop 111, which would cause wear or damage to the gear. It should be noted that this embodiment only illustrates one working mode. Those skilled in the art can design and adjust it according to actual needs. This embodiment does not limit it to a single mode.

[0081] See further Figure 2The other end of the rotating shaft 130 passes through the pipeline cavity of the intake mixing pipe 150 along the radial direction of the intake mixing pipe 150 and is rotatably disposed on the other side of the intake mixing pipe 150 away from the perforation 170. The portion of the rotating shaft 130 located within the pipeline cavity of the intake mixing pipe 150 is provided with a valve plate mounting groove 131 and a first fastener 132. The valve plate 140 is provided with a fastener mounting groove 141 adapted to the first fastener 132, and the valve plate 140 is fixedly installed within the valve plate mounting groove 131 by the first fastener 132. Furthermore, the valve plate 140 is configured to fit the radial cross-section of the pipeline cavity. In this embodiment, the inner wall cavity of the intake mixing pipe 150 is a circular cavity, and preferably, the valve plate 140 is also a circular valve plate 140.

[0082] It is understood that the length of the valve plate mounting groove 131 is equal to or slightly larger than the diameter of the valve plate 140. For example, when the diameter of the valve plate 140 is 30mm, the length of the valve plate mounting groove 131 can be set to 30mm, 30.5mm, 31mm, etc., to facilitate the valve plate 140 to be embedded in the valve plate mounting groove 131. After being embedded in the valve plate mounting groove 131, it is connected by the first fastener 132, which can be a bolt, screw, etc.

[0083] In one embodiment of the intake mixing valve 100 disclosed herein, the rotating shaft 130 and the intake mixing pipe 150 are mounted via bearings. Please refer to [link to relevant documentation]. Figure 9 Needle roller bearings 133 and sliding bearings 134 are respectively arranged at intervals along the axial direction of the rotating shaft 130. The needle roller bearing 133 is located at one end of the rotating shaft 130, with its outer ring fixed to the inner sidewall of the through hole 170 and its axial end fixed to the outer wall of the rotating shaft 130. An inner bearing seal ring 1331 is provided inside the needle roller bearing 133, and the inner bearing seal ring 1331 is fixedly connected to the outer wall of the rotating shaft 130. Two sealing rings 160 of different sizes are provided at the installation area of ​​the needle roller bearing 133 to improve the sealing of the connection between the intake mixing pipe 150 and the valve housing 110. Furthermore, a positioning ring 137 is provided on one side of the end of the needle roller bearing 133, and a groove is provided on the rotating shaft 130 for engaging the positioning ring 137. The positioning ring 137 can ensure the precise axial positioning of the rotating shaft 130 and prevent axial movement.

[0084] A sliding bearing 134 is disposed at the other end of the rotating shaft 130, between the side wall of the intake mixing pipe 150 away from the valve housing 110 and the outer wall of the other end of the rotating shaft 130. A mounting bushing 135 is provided on the outer wall of the sliding bearing 134, and a plug 136 is provided at the end of the mounting bushing 135. The plug 136 is used to seal and block the mounting bushing 135 and the end of the sliding bearing 134.

[0085] With this structural design, the needle roller bearing 133 and the sliding bearing 134 are installed at both ends of the rotating shaft 130. After assembly, the stability is higher, and the coaxiality of the needle roller bearing 133 and the sliding bearing 134 is higher, making the axial positioning of the rotating shaft 130 more accurate and preventing movement.

[0086] In another implementation of the intake mixing valve 100 disclosed in this embodiment, please refer to... Figure 10 Two bearings are arranged side-by-side at intervals near one end of the rotating shaft 130, close to the intake mixing pipe 150. These bearings can be sliding bearings, roller bearings, needle roller bearings, or other types of bearings. In this embodiment, both bearings are preferably needle roller bearings 133. The outer rings of the two bearings are fixed to the inner wall of the through hole 170, and the inner rings are fixed to the outer wall of the rotating shaft 130. A positioning ring 137 is also provided at the end of one of the bearings. The other end of the rotating shaft 130 is rotatably disposed on the inner wall of the intake mixing pipe 150 on the side away from the valve housing 110. See also... Figure 10 The other end of the shaft 130 is a movable shaft end 138, which can rotate relative to the intake mixing pipe 150. In another possible implementation, the two needle roller bearings 133 can be replaced by a single needle roller bearing of equivalent length.

[0087] With the above-mentioned structural design, the shaft 130 is positioned by two bearings on one side. The bearing positioning structure is simpler and has lower assembly requirements, and the reliability of the single-sided support is also higher.

[0088] Example 2

[0089] This utility model also discloses an exhaust gas recirculation device, including the intake mixing valve 100 of any one of Embodiment 1, and further including an exhaust gas recirculation pipe 200, a recirculating exhaust gas cooler 300, an exhaust gas control valve 400, and a booster compressor 500. Please refer to the following for comparison. Figure 3 and Figure 11The recirculating exhaust gas cooler 300 and the exhaust gas control valve 400 are located in the middle of the exhaust gas recirculation pipe 200. The inlet end of the exhaust gas recirculation pipe 200 is connected to the engine's exhaust port (not shown in the figure), and the outlet end is connected to the recirculating exhaust gas inlet 153 of the intake mixing pipe 150 of the intake mixing valve 100. The recirculating exhaust gas (EGR gas) discharged from the engine enters through the inlet end of the exhaust gas recirculation pipe 200, and then enters the recirculating exhaust gas inlet 153 of the intake mixing pipe 150 from the outlet end of the exhaust gas recirculation pipe 200. The air inlet 152 of the intake mixing pipe 150 is connected to the outside air to allow air to enter the intake mixing pipe 150. A gas mixing pipe 600 is also provided downstream of the intake mixing pipe 150, which is used to mix air and recirculating exhaust gas. After the recirculating exhaust gas and air are mixed, they are pressurized by the turbocharger compressor 500 and then supplied to the engine.

[0090] By adopting the above-described structural design, the exhaust gas recirculation device disclosed in this utility model can cool the engine exhaust gas and mix it with air before re-entering the engine, thereby reducing nitrogen oxide emissions, improving engine fuel efficiency, and enhancing engine operational stability.

[0091] It should be noted that, in addition to the specific embodiments described above, those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model is presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to that embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived from the claims of this utility model. To provide a deep understanding of this utility model, many specific details are included in the above description, and this utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0092] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0093] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0094] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0095] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0096] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. An intake mixing valve, characterized in that, The intake mixing valve includes a valve housing, a valve drive mechanism, a rotating shaft, a valve plate, and an intake mixing pipe; wherein The valve drive mechanism is disposed inside the valve housing; One end of the rotating shaft is located inside the valve housing and is connected to the valve drive mechanism for transmission, while the other end can rotatably pass through the valve housing and extend into the intake mixing pipe along the radial direction of the intake mixing pipe. The valve plate is detachably mounted at the other end of the rotating shaft and rotatably located within the cavity of the intake mixing pipe; The air intake mixing pipe includes an air intake end, a circulating exhaust gas intake end, and an exhaust gas outlet end, and the air intake mixing pipe is detachably connected to one side of the valve housing.

2. The intake mixing valve as described in claim 1, characterized in that, in The valve actuation mechanism is located on one side of the valve housing, and the intake mixing pipe is detachably connected to the outer side wall of the valve housing away from the valve actuation mechanism; and A portion of the radial outer side wall of the valve housing abuts against the corresponding portion of the outer side wall of the intake mixing pipe and is detachably connected to each other by fastening components. A sealing ring is provided at the portion of the valve housing that abuts against the intake mixing pipe. The valve housing is provided with a through hole at the part that abuts against the air intake mixing pipe, allowing the rotating shaft to pass through.

3. The intake mixing valve as described in claim 2, characterized in that, The intake mixing pipe and the valve body are made of any one of the following materials: plastic, rubber, or lightweight alloy.

4. The intake mixing valve as described in claim 3, characterized in that, The inner wall of the intake mixing pipe and the area through which the rotating shaft passes are provided with bushings, the bushings being made of metal; wherein The inner ring of the bushing is flush with the inner ring of the intake mixing pipe.

5. The intake mixing valve as described in claim 4, characterized in that, The valve drive mechanism includes a drive unit and a gear transmission assembly that are connected by transmission. The drive unit is fixedly disposed on one side of the valve body. The output end of the drive unit is connected to the gear transmission assembly. The power output end of the gear transmission assembly is connected to one end of the rotating shaft. The drive unit drives the gear transmission assembly to rotate and drives the rotating shaft and the valve plate to rotate synchronously.

6. The intake mixing valve as described in claim 5, characterized in that, The drive unit includes a drive motor, and the gear transmission assembly includes a motor gear, an intermediate gear, and a sector gear. The motor gear is fixedly mounted on the power output end of the drive motor. The intermediate gear includes two sets of meshing gears that are coaxial and spaced apart along the axial direction. The two sets of meshing gears mesh and transmit power with the motor gear and the sector gear, respectively. The sector gear includes integrally formed sector meshing teeth, a gear shaft, and a gear stop. The end of the rotating shaft located inside the valve housing is coaxially and fixedly connected to the gear shaft. A reset elastic element is sleeved on the gear shaft. The gear stop extends toward one side of the rotating shaft. The two legs of the reset elastic element abut against the two sides of the gear stop, and Hall sensors are spaced apart at the end of the sector gear away from the rotating shaft. The inner wall of the valve housing is provided with a limiting stop near the sector gear. When the sector gear is in the initial position, the valve plate is in the normally open state in the intake mixing pipe, the reset elastic element is in the relaxed state, and there is a gap between the side of the sector meshing teeth of the sector gear and the limiting stop extending radially along the sector gear.

7. The intake mixing valve as described in claim 6, characterized in that, The other end of the rotating shaft passes through the cavity of the intake mixing pipe along the radial direction of the intake mixing pipe and is rotatably disposed on the pipe wall of the intake mixing pipe away from the perforation; wherein, the portion of the rotating shaft located within the cavity of the intake mixing pipe is provided with a valve plate mounting groove and a first fastener, the valve plate is provided with a fastener mounting groove adapted to the first fastener, and the valve plate is fixedly installed in the valve plate mounting groove by the first fastener; and The valve plate is configured to fit the radial cross-section of the pipeline cavity; wherein A valve cover is provided on the side of the gear transmission assembly away from the intake mixing pipe, and the valve cover is detachably fixed to the valve body by a second fastener.

8. The intake mixing valve as described in claim 7, characterized in that, Needle roller bearings and sliding bearings are respectively arranged at intervals along the axial direction of the rotating shaft; wherein The needle roller bearing is disposed at one end of the rotating shaft. The outer ring of the needle roller bearing is fixed to the inner wall of the through hole, and one axial end of the needle roller bearing is fixed to the outer wall of the rotating shaft. Furthermore, an inner bearing seal ring is provided inside the needle roller bearing, and the inner bearing seal ring is fixedly connected to the outer wall of the rotating shaft. The sliding bearing is disposed at the other end of the rotating shaft, between the side wall of the intake mixing pipe away from the valve housing and the outer wall of the other end of the rotating shaft.

9. The intake mixing valve as described in claim 7, characterized in that, Two bearings are arranged side-by-side at intervals near one end of the rotating shaft, close to the intake mixing pipe. The outer rings of the two bearings are fixed to the inner wall of the perforation, and the inner rings of the two bearings are fixed to the outer wall of the rotating shaft. The other end of the shaft is rotatably disposed on the inner sidewall of the intake mixing pipe on the side away from the valve housing.

10. A waste gas recirculation device, characterized in that, The system includes the intake mixing valve as described in any one of claims 1 to 9, and further includes an exhaust gas recirculation pipe, a recirculating exhaust gas cooler, an exhaust gas control valve, and a booster compressor; wherein... The circulating exhaust gas cooler and the exhaust gas control valve are located in the middle of the exhaust gas recirculation pipe. The inlet end of the exhaust gas recirculation pipe is connected to the exhaust port of the engine, and the outlet end is connected to the circulating exhaust gas inlet end of the intake mixing pipe of the intake mixing valve. The air inlet end of the intake mixing pipe is connected to the outside air to allow air to enter the intake mixing pipe, and the air outlet end of the intake mixing pipe is connected to the air inlet of the engine.

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