Auxiliary pipe structure of intake manifold

Abstract

The present invention relates to an auxiliary pipe structure of an intake manifold, comprising an intake manifold pressure stabilizing chamber, an exhaust gas inlet pipe and an air guide bend pipe, wherein: the intake manifold pressure stabilizing chamber is provided with an intake throat pipe and a plurality of intake manifold airways; the exhaust gas inlet pipe is arranged on the outer wall of the intake throat pipe and leads to the intake throat pipe; the air guide bend pipe is detachably arranged in the intake throat pipe, one end is open to form an air guide inlet, the air guide inlet is connected to the exhaust gas inlet pipe, and the other end is bent and arranged along the axial direction of the intake throat pipe, and is provided with an exhaust gas outlet. Compared with the prior art, the present invention has the advantages of uniform air intake, convenient installation, wide application range, simple structure, low manufacturing cost, etc.

Description

Technical Field

[0001] The invention relates to the technical field of intake manifolds, and in particular to an auxiliary pipe structure of an intake manifold. Background Art

[0002] At present, with the continuous tightening of automobile emission regulations, automobile engines are developing in the direction of miniaturization, integration and lightweight. At the same time, some technologies that can reduce engine emissions are increasingly valued by automobile manufacturers and the entire engine industry. As a key component of the intake system, in order to meet the requirements of lightweight and integration, generally speaking, various automobile manufacturers will integrate the interfaces of the crankcase ventilation system, carbon canister adsorption system, and exhaust gas recirculation system on the intake manifold, and evenly introduce them into the combustion chamber of the engine through several air passages of the intake manifold, and participate in the combustion of the engine with the oil-gas mixture. In order to meet the engine emission requirements, it is increasingly important to evenly introduce the mixed gas of the engine oil from the engine crankcase ventilation system and the engine combustion chamber blowby gas, the fuel vapor from the carbon canister adsorption system, and the exhaust gas generated by the engine combustion in the exhaust gas recirculation system into the combustion chamber of the engine through the air passage of the intake manifold, especially the exhaust gas recirculation gas. The position and specific shape of these interfaces will have a crucial impact on the uniformity of gas distribution. Because the intake manifold is in the process of development, it is also necessary to evenly distribute the gas from the throttle flange to each air passage. Therefore, if the position of this pipe interface is placed on the throat near the throttle, and the flow direction of the gas entering the intake manifold is ensured to be consistent with the gas flowing from the throttle body to the air passage, it can better ensure that the gas from the interface flows evenly into each cylinder of the intake manifold.

[0003] Since the temperature of the exhaust gas recirculation gas is relatively high, a metal pipe is generally used to introduce the high-temperature exhaust gas from the engine into the intake manifold. Therefore, one end of the metal pipe is inserted into the corresponding mounting hole reserved on the intake manifold, and an O-ring is put on one end of the metal pipe for sealing; then, the flange at one end of the metal pipe is fixed to the mounting hole to prevent it from loosening. Specifically, screws are passed through the mounting holes on the flange to fix the flange on the mounting hole of the intake manifold. This type of structural design is limited by the support space that the intake manifold can provide and the surrounding installation space. The exhaust gas can only be introduced into the intake manifold in a direction perpendicular to the flow direction of the fresh gas from the throttle body. This design is not conducive to the uniform distribution of the exhaust gas. In order to better distribute the gas, the diameter of the conduit has to be increased, which takes up more space. Summary of the invention

[0004] The purpose of the present invention is to provide an auxiliary pipe structure of an intake manifold in order to overcome the defects of the prior art.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] An auxiliary pipe structure of an intake manifold, comprising:

[0007] The intake manifold pressure stabilizing chamber is equipped with an intake throat and multiple intake manifold airways.

[0008] The exhaust gas inlet pipe is arranged on the outer wall of the intake throat and leads to the intake throat.

[0009] The air guide bend is detachably arranged in the air intake pipe, one end of which is open to form an air guide inlet, which is connected to the exhaust gas inlet pipe, and the other end is bent and arranged along the axial direction of the air intake pipe, and is provided with an exhaust gas outlet.

[0010] Preferably, the inner side surface of the air intake throat is provided with a bend guide groove along the axial direction of the air intake throat and leading to the air intake end of the air intake throat, and a bend guide plate is sleeved at the air inlet of the air guide bend pipe. By sliding the bend guide plate into the bend guide groove, a detachable connection between the air guide bend pipe and the air intake throat is achieved, and the air guide inlet is connected to the exhaust gas inlet pipe.

[0011] Preferably, the bending guide plate is in the shape of an arc sheet, and the two side ends of the bending guide plate are thinned to form bending slide rails. The side wall of the intake throat is provided with an outward thickened portion at the connection with the exhaust gas inlet pipe, and the bending guide groove is arranged in the thickened portion, and the cross-sectional shape matches the cross-sectional shape of the bending guide plate.

[0012] Preferably, the air guide bend is provided with an exhaust gas outlet at one end thereof facing the air inlet end of the air inlet throat and provided with a cover, and the exhaust gas outlet is provided in plurality and distributed circumferentially on the side wall of the end of the air guide bend.

[0013] Preferably, the intake end of the intake throat is provided with an intake manifold throttle flange matching the end, the intake manifold throttle flange is provided with a throttle flange sealing groove, and a throttle flange sealing ring is provided in the throttle flange sealing groove.

[0014] Preferably, the air inlet end of the exhaust gas inlet pipe is open to form an exhaust gas inlet, and fixed threaded holes are provided on both sides of the exhaust gas inlet pipe.

[0015] Preferably, the air inlet end of the exhaust gas inlet pipe is in the shape of a nozzle.

[0016] The working principle of the present invention is:

[0017] In terms of gas flow direction, during the intake stroke of the engine, fresh gas from the air filter enters the junction between the air filter and the intake manifold throttle flange through the throttle valve, then passes through the intake throat, enters the intake manifold pressure-stabilizing chamber, and then evenly enters multiple intake manifold air passages; exhaust gas from the exhaust gas recirculation system, crankcase ventilation system and carbon canister adsorption system first enters from the exhaust gas inlet of the exhaust gas inlet pipe, then passes through the air guide inlet, and after the gas flow direction is changed by the air guide bend, it flows into the intake throat from multiple exhaust gas outlets, and flows evenly into the multiple intake manifold air passages arranged after the intake manifold pressure-stabilizing chamber along with the fresh gas.

[0018] Structurally, the air guide elbow of the present invention is installed together through an elbow guide plate and an elbow guide groove, and after the throttle is installed on the intake manifold, it is pressed onto the installation plane of the throttle flange to achieve fixation.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) Uniform air intake: The structure of the present invention changes the air intake direction of the exhaust gas through the air intake elbow to facilitate air intake uniformity, and can be applied to exhaust gas introduced in any direction.

[0021] (2) Easy installation: The guide groove and guide plate structure of the present invention can easily install the intake elbow onto the intake manifold.

[0022] (3) Wide range of applications: This article can adapt to the introduction of exhaust gas from different systems through the structural form of the exhaust gas inlet. You can use fixed threaded holes to fix the exhaust gas metal pipe or hard pipe from the exhaust gas recirculation system, crankcase ventilation system and carbon canister adsorption system to the exhaust gas inlet through threaded screws, or you can use a nozzle to fix the hose to the nozzle through a clamp, or clamp the hose to the exhaust gas inlet through a Trumpet connector.

[0023] (4) Simple structure: The present invention utilizes the process of installing the throttle valve on the intake manifold to cleverly perform the final fixation of the air guide elbow.

[0024] (5) Low manufacturing cost: Since the air guide elbow is installed on the intake manifold later, it can be made of plastic or metal materials and can be processed into standard parts according to needs, so as to further reduce the manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Figure 2 It is a partial exploded schematic diagram of the present invention;

[0027] Figure 3It is a cross-sectional schematic diagram of the air guide elbow of the present invention.

[0028] In the figure, 1 is the intake manifold throttle flange, 2 is the intake manifold pressure stabilizing chamber, 3 is the intake manifold airway, 4 is the intake manifold airway, 5 is the air guide inlet, 6 is the throttle flange sealing ring, 7 is the fixed threaded hole, 8 is the throttle flange sealing groove, 9 is the elbow slide rail, 10 is the elbow guide groove, 11 is the exhaust gas outlet, 12 is the air guide elbow, 13 is the intake throat, 14 is the elbow guide plate, and 15 is the cover. DETAILED DESCRIPTION

[0029] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Example 1

[0031] An auxiliary pipe structure of an intake manifold, such as Figures 1 to 3 As shown, it includes an intake manifold pressure-stabilizing chamber 2, an exhaust gas inlet pipe 4 and an air guide bend 12, wherein: the intake manifold pressure-stabilizing chamber 2 is provided with an intake throat 13 and a plurality of intake manifold airways 3; the exhaust gas inlet pipe 4 is arranged on the outer side wall of the intake throat 13 and leads to the intake throat 13; the air guide bend 12 is detachably arranged in the intake throat 13, one end of which is open to form an air guide inlet 5, and the air guide inlet 5 is connected to the exhaust gas inlet pipe 4, and the other end is bent and arranged axially along the intake throat 13, and is provided with an exhaust gas outlet 11.

[0032] In this embodiment, the inner side surface of the air intake throat 13 is provided with a pipe bend guide groove 10 along the axial direction of the air intake throat 13 and leading to the air intake end of the air intake throat 13, and a pipe bend guide plate 14 is sleeved at the air intake inlet 5 of the air intake pipe 12. By sliding the pipe bend guide plate 14 into the pipe bend guide groove 10, the air intake pipe 12 and the air intake throat 13 are detachably connected, and the air intake 5 is connected to the exhaust gas inlet pipe 4. The pipe bend guide plate 14 is in the shape of an arc sheet, and the two side ends of the pipe bend guide plate 14 are thinned to form a pipe bend slide rail 9. The side wall of the air intake throat 13 is provided with an outwardly thickened portion at the connection with the exhaust gas inlet pipe 4, and the pipe bend guide groove 10 is arranged at the thickened portion, and the cross-sectional shape matches the cross-sectional shape of the pipe bend guide plate 14.

[0033] In this embodiment, the exhaust gas outlet 11 is provided on the air guide bend 12, one end of which faces the intake end of the intake throat 13, and is provided with a cover 15. There are multiple exhaust gas outlets 11, which are circumferentially distributed on the side wall of the end of the exhaust gas guide bend 12. The above arrangement changes the intake direction of the exhaust gas, which is beneficial to the intake uniformity and can be applied to the exhaust gas introduced in any direction.

[0034] In this embodiment, the intake end of the intake throat 13 is provided with an intake manifold throttle flange 1 matched with the end, the intake manifold throttle flange 1 is provided with a throttle flange sealing groove 8, and a throttle flange sealing ring 6 is provided in the throttle flange sealing groove 8. After the throttle is installed on the intake manifold, it is pressed on the installation plane of the throttle flange (not shown in the drawings) to achieve fixation.

[0035] In this embodiment, the air inlet end of the exhaust gas inlet pipe 4 is open to form an exhaust gas inlet. Fixed threaded holes 7 are provided on both sides of the exhaust gas inlet pipe 4. The exhaust gas metal pipe or hard pipe from the exhaust gas recirculation system, the crankcase ventilation system and the carbon canister adsorption system is fixed to the exhaust gas inlet through threaded screws. The air inlet end of the exhaust gas inlet pipe 4 can also be in the shape of a nozzle, and the hose is fixed to the nozzle through a clamp. The specific selection can be flexibly made according to the usage.

[0036] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. An auxiliary pipe structure of an intake manifold, characterized in that: include: The intake manifold pressure stabilizing chamber (2) is provided with an intake throat (13) and a plurality of intake manifold air passages (3). The exhaust gas inlet pipe (4) is arranged on the outer side wall of the air intake pipe (13) and leads to the air intake pipe (13). An air guide bend (12) is detachably arranged in the air intake throat (13), one end of which is open to form an air guide inlet (5), the air guide inlet (5) is connected to the exhaust gas inlet pipe (4), and the other end is bent and arranged along the axial direction of the air intake throat (13), and is provided with an exhaust gas outlet (11); The inner side surface of the air intake throat (13) is provided with a pipe bend guide groove (10) extending along the axial direction of the air intake throat (13) and leading to the air intake end of the air intake throat (13); a pipe bend guide plate (14) is sleeved at the air intake inlet (5) of the air intake pipe bend (12); by sliding the pipe bend guide plate (14) into the pipe bend guide groove (10), a detachable connection between the air intake pipe (12) and the air intake throat (13) is achieved, and the air intake (5) is connected to the exhaust gas inlet pipe (4); The air guide bend (12) is provided with an exhaust gas outlet (11) at one end thereof facing the intake end of the intake throat (13), and is provided with a cover (15). The exhaust gas outlet (11) is provided in plurality and distributed circumferentially on the side wall of the end of the air guide bend (12).

2. The auxiliary pipe structure of the intake manifold according to claim 1, characterized in that: The pipe bending guide plate (14) is in the shape of an arc sheet, and the two side ends of the pipe bending guide plate (14) are thinned to form pipe bending slide rails (9). The side wall of the air intake pipe (13) is provided with an outwardly thickened portion at the connection with the exhaust gas inlet pipe (4), and the pipe bending guide groove (10) is arranged in the thickened portion, and the cross-sectional shape matches the cross-sectional shape of the pipe bending guide plate (14).

3. The auxiliary pipe structure of the intake manifold according to claim 1, characterized in that: The intake end of the intake throat (13) is provided with an intake manifold throttle flange (1) matching the end, the intake manifold throttle flange (1) is provided with a throttle flange sealing groove (8), and a throttle flange sealing ring (6) is provided in the throttle flange sealing groove (8).

4. The auxiliary pipe structure of the intake manifold according to claim 1, characterized in that: The air inlet end of the exhaust gas inlet pipe (4) is open to form an exhaust gas inlet, and fixing threaded holes (7) are provided on both sides of the exhaust gas inlet pipe (4).

5. The auxiliary pipe structure of the intake manifold according to claim 1, characterized in that: The air inlet end of the exhaust gas inlet pipe (4) is in the shape of a nozzle.

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