CN207131511U - A kind of intake muffler - Google Patents

Abstract

The utility model provides an air intake muffler, which belongs to the field of vehicles. The air intake muffler includes: a main body, which is a hollow shell, inside which is a through ventilation duct, one end of the ventilation duct is an air inlet, and the other end is an air outlet, and the air flows through the air inlet to the air outlet, The outside of the body is provided with a crankcase ventilation pipe connected with the ventilation pipe, and the oil-air mixture flows into the ventilation pipe through the crankcase ventilation pipe, wherein a venturi tube is arranged inside the ventilation pipe, and the venturi The axis of the tube is parallel to the axis of the ventilation duct, the diameter of the middle part of the Venturi tube is smaller than the diameter of both ends, and the middle part of the Venturi tube is provided with an effusion adsorption tube, which communicates with the Venturi tube and extends to the bottom of the ventilation duct At the effusion tank, the effusion adsorption tube absorbs the effusion at the effusion tank to the Venturi tube and discharges it out of the ventilation duct along with the air. The intake muffler of the utility model can effectively and automatically remove fluid accumulation.

Description

an intake muffler

technical field

The utility model relates to the field of vehicles, in particular to an air intake muffler.

Background technique

The oil-air mixture volatilized by the engine lubrication system and fuel system will remain at the bottom of the intake muffler, and after the engine stops, the oil-water liquid remaining or condensed in the crankcase ventilation pipe or fuel vapor pipe will also flow into the intake air under the action of gravity The bottom of the muffler, so the bottom of the intake muffler is prone to fluid accumulation.

In the prior art, the accumulated fluid is usually removed by designing a special drainage device. However, this method requires an additional design structure, which is cumbersome and has a poor effect.

Utility model content

One purpose of the present utility model is to provide an air inlet muffler, which can effectively and automatically remove fluid accumulation.

In particular, the utility model provides an intake muffler, including:

The main body is a hollow shell, the outside of which is an outer shell, and the inside of which is a through ventilation duct. One end of the ventilation duct is an air inlet, and the other end of the ventilation duct is an air outlet. Air passes through the inlet The air port flows to the air outlet, and the outside of the body is provided with a crankcase ventilation pipe connected with the ventilation pipe, and the oil-gas mixture flows into the ventilation pipe through the crankcase ventilation pipe, wherein,

A Venturi tube is provided inside the ventilation duct, the axis of the Venturi tube is parallel to the axis of the ventilation duct, the diameter of the middle part of the Venturi tube is smaller than the diameters of both ends, and a liquid effusion is arranged in the middle part of the Venturi tube. An adsorption tube, the liquid accumulation adsorption tube communicates with the Venturi tube and extends to the liquid accumulation tank at the bottom of the ventilation duct, and the liquid accumulation absorption tube absorbs the liquid accumulation at the liquid accumulation tank to the The venturi tube and exits the ventilation duct with the air.

Further, one end of the ventilation duct close to the air inlet is an arc-shaped elbow.

Further, the liquid accumulation tank is located at the bottom of the ventilation duct near the air outlet.

Further, the Venturi tube is located at one end of the ventilation duct near the air outlet.

Further, the Venturi tube includes a constriction tube, a throat and a diffuser tube, the throat tube is located in the middle of the Venturi tube, the constriction tube and the diffuser tube are both trumpet-shaped, respectively located in the throat The right side and the left side of the tube form the Venturi tube with a small diameter in the middle and a large diameter on both sides, and the end of the shrink tube with a large diameter is close to the inlet to form the entrance of the Venturi tube, and the diffuser The end of the tube with a larger diameter forms the outlet of the Venturi tube near the gas outlet.

In the intake muffler of the utility model, a Venturi tube is arranged inside the ventilation pipe, so that the effusion is absorbed to the throat through the effusion adsorption tube, and is discharged from the intake muffler under the action of high-speed air flow, thereby effectively Drain the fluid.

According to the following detailed description of specific embodiments of the utility model in conjunction with the accompanying drawings, those skilled in the art will be more aware of the above and other objectives, advantages and features of the utility model.

Description of drawings

Hereinafter, some specific embodiments of the present utility model will be described in detail in an exemplary rather than restrictive manner with reference to the accompanying drawings. The same reference numerals in the drawings designate the same or similar parts or parts. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the attached picture:

Fig. 1 is a perspective view without an outer casing of an air inlet muffler according to an embodiment of the present invention;

Fig. 2 is a cross-sectional view of an intake muffler according to an embodiment of the present invention.

Detailed ways

Fig. 1 is a perspective view without an outer casing of an intake muffler according to an embodiment of the present invention. Fig. 2 is a cross-sectional view of an intake muffler according to an embodiment of the present invention. As shown in FIG. 1 , the intake muffler may generally include a body 10 and a venturi 20 . The main body 10 is a hollow shell with an outer shell 100 (see FIG. 2 ) on the outside and a through ventilation duct 101 inside. One end of the ventilation duct 101 is an air inlet 102, and the end of the ventilation duct 101 close to the air inlet 102 is an arc-shaped elbow. The other end of the ventilation duct 101 is an air outlet 103, and air flows to the air outlet 103 through the air inlet 102. A crankcase ventilation pipe 104 communicating with the ventilation duct 101 is provided outside the body 10 , the oil-air mixture flows into the ventilation pipe 101 through the crankcase ventilation pipe 104 . A Venturi tube 20 is arranged inside the ventilation duct 101, the axis of the Venturi tube 20 is parallel to the axis of the ventilation duct 101, and the diameter of the middle part of the Venturi tube 20 is smaller than the diameters at both ends. The middle part is provided with a liquid accumulation absorption pipe 21, and the liquid accumulation absorption pipe 21 communicates with the Venturi tube 20 and extends to the liquid accumulation tank 105 (see FIG. 2 ) at the bottom of the ventilation duct 101. The liquid tank 105 is located at the bottom of the ventilation duct 101 near the air outlet 103 . The fluid absorption tube 21 absorbs the fluid located at the fluid tank 105 to the venturi tube 20 and discharges the fluid out of the ventilation duct 101 along with the air.

In one embodiment, the venturi tube 20 is located at one end of the ventilation duct 101 near the air outlet 103 . As shown in Figure 2, the Venturi tube 20 includes a constriction tube 201, a throat 202 and a diffusion tube 203, the throat 202 is located in the middle of the Venturi tube 20, the constriction tube 201 and the diffusion tube 203 are trumpet-shaped, respectively located on the right side and left side of the throat 202, forming the Venturi tube 20 with a small diameter in the middle and large diameters on both sides, and the end of the shrink tube 201 with a large diameter is close to the inlet The port 102 forms the inlet 204 of the Venturi tube 20 , and the end of the diffusion tube 203 with a larger diameter close to the gas outlet 103 forms the outlet 205 of the Venturi tube 20 .

According to the working principle of the Venturi effect, the cross-sectional area of the inlet 204 and the throat 202 are designed to be sufficient to absorb the accumulated liquid to the Venturi tube 20 .

The working principle of the Venturi effect assumes that the streamlines of the average moving airflow are of equal height, which can be obtained according to Bernoulli's theorem and the continuity equation:

S ₁ *V ₁ =S ₂ *V ₂ =Q (1)

From formula (1) and formula (2) can get

P0=ρ0gh (4)

in,

ρ is the equivalent density of air flow;

ρ0 is the fluid density;

P0 is to absorb the effusion to the throat 202 to overcome the pressure generated by the effusion;

Q is the equivalent flow rate,

ΔP is the pressure difference between the effusion tank 105 and the throat 202;

V1 is the flow rate of 204 at the inlet;

S1 is the cross-sectional area of 204 at the entrance;

P1 is 204 static pressure at the entrance;

V2 is the flow velocity at throat 202;

S2 is the cross-sectional area of the throat 202;

P2 is the static pressure at throat 202;

h is the distance from the bottom of the effusion tank 105 to the bottom of the throat 202 .

When △P>P ₀ is generated, that is to say, the cross-sectional area S1 of the inlet 204 and the cross-sectional area S2 of the throat 202 are designed so that the pressure difference ΔP between the effusion tank 105 and the throat 202 is greater than that of absorbing the effusion to the throat. The pipe 202 needs to overcome the pressure P ₀ generated by the effusion, so that the effusion is adsorbed to the throat 202, and under the action of high-speed air flow, it is discharged to the air outlet 103, and then enters the engine air intake 102, and finally Participate in combustion and consume, so as to achieve the purpose of real-time adsorption of liquid at the bottom of the muffler.

Furthermore, since the increase of the liquid accumulation will lead to the reduction of the anechoic volume and affect the noise reduction effect, when the air temperature reaches the freezing point, the moisture in the liquid accumulation will freeze to form ice particles, and the ice particles may enter the supercharger and cause the compressor blades to In addition, the accumulation of oil in the intake system also poses certain security problems. The present invention effectively avoids the above problems by setting the Venturi tube 20 to discharge the effusion in real time.

So far, those skilled in the art should recognize that although a number of exemplary embodiments of the present invention have been shown and described in detail herein, they can still be used according to the present invention without departing from the spirit and scope of the present invention. Many other variations or modifications that conform to the principles of the utility model are directly determined or derived from the disclosed content of the new model. Therefore, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims (5)

1. An intake muffler, comprising: The main body is a hollow shell, the outside of which is an outer shell, and the inside of which is a through ventilation duct. One end of the ventilation duct is an air inlet, and the other end of the ventilation duct is an air outlet. Air passes through the inlet The air port flows to the air outlet, and the outside of the body is provided with a crankcase ventilation pipe that communicates with the ventilation pipe, and the oil-gas mixture flows into the ventilation pipe through the crankcase ventilation pipe. It is characterized in that, A Venturi tube is provided inside the ventilation duct, the axis of the Venturi tube is parallel to the axis of the ventilation duct, the diameter of the middle part of the Venturi tube is smaller than the diameters of both ends, and a liquid effusion is arranged in the middle part of the Venturi tube. An adsorption tube, the liquid accumulation adsorption tube communicates with the Venturi tube and extends to the liquid accumulation tank at the bottom of the ventilation duct, and the liquid accumulation absorption tube absorbs the liquid accumulation at the liquid accumulation tank to the The venturi tube and exits the ventilation duct with the air. 2 . The intake muffler according to claim 1 , wherein the end of the ventilation duct close to the air inlet is an arc-shaped elbow. 3 . 3 . The intake muffler according to claim 1 , wherein the liquid accumulation groove is located at the bottom of the ventilation duct near the air outlet. 4 . 4. The intake muffler according to any one of claims 1-3, wherein the Venturi tube is located at one end of the ventilation duct near the air outlet. 5. The intake muffler according to claim 4, wherein the Venturi tube comprises a constriction tube, a throat and a diffusion tube, the throat is located in the middle of the Venturi tube, the constriction tube and The diffuser tubes are trumpet-shaped, located on the right side and left side of the throat respectively, forming the Venturi tube with a small diameter in the middle and large diameters on both sides, and the end of the shrink tube with a large diameter is close to the intake air The mouth forms the inlet of the Venturi tube, and the end of the diffusion tube with a larger diameter close to the gas outlet forms the outlet of the Venturi tube.