CN202718782U - Half-moon wedge-shaped resonant intake pipe - Google Patents

Abstract

The purpose of the utility model is to provide a half-moon wedge-shaped resonant intake pipe, including an intake manifold, a resonance cavity, an intake manifold, a booster pipe, and a flange, and the intake manifold, a resonance cavity, an intake manifold, and a booster tube are connected in sequence The intake manifold includes the upper half of the intake manifold and the lower half of the intake manifold, and the upper half of the intake manifold and the lower half of the intake manifold are connected together by flanges; the resonant cavity includes The sides of the resonant cavity, the arc surface of the resonator cavity and the bottom surface of the resonator cavity are connected to each other. The bottom surface of the resonator is connected. The utility model converts the gas flow velocity into gas pressure, thereby improving the power density drop problem of the gas engine caused by the unsatisfactory resonance effect, better organizing the gas streamline, expanding the resonance speed range, and reducing the gas flow loss, thereby improving the efficiency of the gas engine. Power, economy and emission performance.

Description

Half-moon wedge-shaped resonant intake pipe

technical field

The utility model relates to an engine, in particular to an air intake mechanism of the engine.

Background technique

With the increasingly serious energy crisis and environmental pollution, the state has actively introduced various policies to encourage internal combustion engine manufacturers to actively develop various energy-saving and emission-reduction technologies. Natural gas is an excellent alternative fuel because of its clean combustion, high calorific value and abundant reserves. However, natural gas is a gaseous fuel. When it is mixed in the intake port and then enters the cylinder, it occupies a part of the intake charge, thereby reducing the amount of air entering the cylinder. Therefore, under the same conditions, the power density of a gas engine is lower than that of a diesel engine or a gasoline engine. Some. In order to increase the intake charge to make up for the defect of power density drop, the intake resonance technology is adopted. Due to the periodic opening and closing of the intake valve and the reciprocating linear motion of the piston, the gas pressure in the intake pipe will fluctuate periodically. A certain resonant speed can be determined through the rationalized structural design of the resonant cavity and the intake manifold. At this speed, the gas pressure fluctuation can be guaranteed to be in the peak state when the intake valve is opened, thereby increasing the gas pressure and increasing the intake air charge. The purpose of increasing the amount and improving the intake efficiency. But when it is in a variable speed working environment, the resonance effect will be weakened, and even when the speed is set to the trough, the opening of the intake valve will have a negative effect, thereby reducing the intake charge and further reducing the power density of the gas engine.

Contents of the invention

The purpose of the utility model is to provide a half-moon wedge-shaped resonant intake pipe which improves the power, economy and emission performance of the gas engine.

The purpose of this utility model is achieved in that:

The utility model half-moon wedge-shaped resonant intake pipe is characterized in that it includes an intake manifold, a resonance cavity, an intake manifold, a booster pipe, and a flange, and the intake manifold, resonance cavity, intake manifold, and booster tube are connected in sequence The intake manifold includes the upper half of the intake manifold and the lower half of the intake manifold, and the upper half of the intake manifold and the lower half of the intake manifold are connected together by flanges; the resonant cavity includes The sides of the resonant cavity, the arc surface of the resonator cavity and the bottom surface of the resonator cavity are connected to each other. The bottom surface of the resonator is connected.

The utility model can also include:

1. The air intake manifold is in the shape of a micro horn as a whole, and the arc surface of the intake manifold and the resonant cavity is connected by a round transition. same wall thickness.

2. The inner and outer walls of the branch pipes in the upper half of the intake manifold are respectively tangent to the inner and outer walls of the side of the resonant cavity, and the branch pipes at both ends of the upper half of the intake manifold coincide with the arc-shaped wall of the resonant cavity , the upper half of the intake manifold has the same wall thickness as the resonant cavity.

3. The booster pipe is connected to a variable-section pipeline gradually changing from a round tube to a square tube, and an end flange is installed on the variable-section pipeline.

The utility model has the advantages that: the utility model converts the gas flow velocity into gas pressure, thereby improving the power density drop problem of the gas engine caused by the unsatisfactory resonance effect, better organizing the gas streamline, expanding the resonance speed range, and reducing the gas pressure. Flow loss, thereby improving the power, economy and emission performance of gas engines.

Description of drawings

Fig. 1 is the overall structural diagram of the utility model;

Fig. 2 is the overall side view of the utility model;

Fig. 3 is the structural diagram of the upper section of the intake pipe of the present utility model;

Fig. 4 is the structural diagram of the upper and lower segment sealing gaskets of the present utility model;

Fig. 5 is a structural diagram of the lower section of the intake pipe of the present invention;

Fig. 6 is a side view structure diagram of the lower section of the intake pipe of the present invention.

Detailed ways

The utility model is described in more detail below in conjunction with accompanying drawing example:

1-6, the utility model includes: intake manifold 1, resonant cavity 2, intake manifold upper half 3, intake manifold lower half 4 and booster pipe 5. The resonant cavity 2 is in the shape of a half-moon wedge as a whole, the intake manifold 1 is connected to the arc surface 8 of the resonance cavity 2, and the arc surface 8 of the resonance cavity 2 has an axisymmetric structure according to the center line of the intake manifold 1, and the wall thickness of the intake manifold 1 The wall thickness of the resonant cavity 2 is the same, the outer wall surface of the intake manifold 1 is tangent to the half-moon-shaped walls 7 on both sides of the resonant cavity 2, the upper half 3 of the four intake manifolds is cast together with the bottom surface 9 of the resonant cavity, and the intake air The wall thickness of the upper half of the manifold 3 is the same as the wall thickness of the resonant cavity 2, and the inner and outer walls of the upper half of the manifold 3 are tangent to the inner and outer walls of the half-moon-shaped wall 7 on both sides of the resonant cavity 2, located in the resonant cavity The intake manifolds on both sides coincide with the ends of the arc surface 8 of the resonant cavity 2, and the lower half of the intake manifold 4 has a booster pipe 5. The resonant cavity 2 is surrounded by the side 7, the arc 8 and the bottom 9. The whole body presents a half-moon wedge shape, the side 7 is a half-moon, and the side view of the arc 8 shows a wedge shape with a wide top and a narrow bottom. The intake manifold is composed of the upper half of the manifold 3 and the lower half of the manifold 4. The upper half of the intake manifold 3 is connected to the bottom surface 9 of the resonant cavity 2, and the wall thickness of the upper half of the manifold is the same as that of the resonant cavity 2. The same, the manifold 11 and the manifold 12 of the upper half of the manifold are all tangent to the inner and outer walls of the half-moon side 7 of the resonant cavity 2, and the manifold 10 and the manifold 13 of the upper half of the manifold are all tangent to the inner and outer walls of the resonant cavity 2. The inner and outer walls of the half-moon-shaped side 7 are both tangent, and also completely coincide with the arc-shaped wall 8 of the resonant cavity 2 . The lower half of the intake manifold 3 has a booster pipe 5 on each manifold. Become a variable cross-section pipeline 21 of a square pipe, and the end of the lower half section 3 of the intake manifold is a flange 22 . The upper half section 3 of the intake manifold and the lower half section 4 of the intake manifold are imprisoned and connected by nuts through rectangular flanges 14 and 19 .

As shown in Figures 1, 2, and 3, the gas enters the resonance cavity 2 from the intake manifold 1 through the connecting fillet 6, where the fillet 6 is tangent to the intake manifold 1 and the resonance cavity 2, which better organizes the gas The streamline reduces the resistance in the process of gas flowing through, and in addition, can also increase the pressure of gas entering the resonant cavity 2 .

As shown in Figures 1, 2, and 3, the resonant cavity 2 has a half-moon structure with a wide top and a narrow bottom. This can increase the diameter of the intake manifold 1 to meet the demand for gas flow; the resonant cavity 2 is connected to the intake pipe The wall 8 is arc-shaped, respectively tangent to the front and rear half-moon-shaped walls 7 of the resonant cavity 2, and the end completely coincides with the walls of the intake pipe branches 10 and 13, reducing flow loss.

As shown in Figures 2, 4, and 5, the intake manifold is divided into the upper half of the intake manifold 3 and the lower half of the intake manifold 4, corresponding to the connection sequence of the upper and lower branches of the intake manifold 10~15, 11~ 16, 12-17, 13-18; between them are connected by bolts through the sealing gasket 20, and sealant should be applied to the joints to better ensure air tightness and prevent air leakage.

As shown in Figures 5 and 6, in order to compensate for the decrease in intake pressure and gas charge at non-resonant speeds, a booster pipe 5 is installed at the end of the lower half of the intake manifold 4 to convert the gas flow velocity into gas The pressure increases the gas charge and extends the resonant speed range, thereby improving the power, economy and emission performance of the gas engine.

The utility model adopts casting form to manufacture as a whole. During casting, it is divided into three parts, the upper body of the intake pipe, the lower branch pipes 15-18 of the intake manifold, and the lower half of the intake manifold 4 flanges 19 for casting.

For the upper body of the intake pipe, three sandboxes are used for casting, and the first and second sandboxes are used to cast the intake manifold 1, intake manifold flange, resonance cavity 2 and upper half of the intake manifold 3 from bottom to top. The molded surface passes through the center line of the intake manifold 1 and is parallel to the flange surface of the flange 14 of the upper half of the intake manifold 3. The second sandbox is used for sand digging, and the third sandbox is used to cast the upper half of the intake manifold. Section 3 flange 14, and rationally arrange the pouring system and air holes, and finally put the core sand and wait for pouring.

For intake manifold lower branch pipes 15-18, because the structure of each lower branch pipe is the same, it is enough to cast only one single branch pipe during casting. During casting, two sandboxes are used for casting, the parting surface passes through the centerline of the booster pipe 5 and is parallel to the flange 19 of the lower half of the intake manifold 4, and the second sandbox is dug for sand molding, and the pouring system and air holes are arranged , put in the core sand and wait for pouring.

The lower half of the intake manifold 4 flange 19 is much easier to form a simple two-box shape. It should be noted that casting defects such as sand inclusions, pores, and slag inclusions are likely to occur when the plane is too large. During molding, it can be avoided by inclining the flange 19 at a certain small angle. Finally, the lower branch pipes 15-18 of the intake manifold are welded to the lower half section 4 flange 19 of the intake manifold.

Claims (5)

1. first quarter moon wedge shape resonant intake tube is characterized in that: comprise intake manifold, resonant cavity, intake manifold, pressure inlet, flange, intake manifold, resonant cavity, intake manifold, pressure inlet link to each other successively; Intake manifold comprises intake manifold upper semisection and intake manifold lower semisection, and intake manifold upper semisection and intake manifold lower semisection link together by flange; Described resonant cavity comprises interconnective resonant cavity side, resonant cavity cambered surface, resonant cavity bottom surface, the resonant cavity side is semilune, the resonant cavity cambered surface is wedge shape wide at the top and narrow at the bottom, and resonant cavity integral body is the first quarter moon wedge shape, and the intake manifold upper semisection links to each other with the resonant cavity bottom surface.

2. first quarter moon wedge shape resonant intake tube according to claim 1, it is characterized in that: described intake manifold is whole for little tubaeform, intake manifold's resonant cavity cambered surface adopts round-corner transition to connect, intake manifold's inside and outside wall is tangent with resonant cavity side inside and outside wall respectively, and the intake manifold is identical with the wall thickness of resonant cavity.

3. first quarter moon wedge shape resonant intake tube according to claim 1 and 2, it is characterized in that: the inside and outside wall of the arm of described intake manifold upper semisection is tangent with the inside and outside wall of resonant cavity side respectively, the arm at intake manifold upper semisection two ends overlaps with the circular arc wall of resonant cavity cambered surface, and the intake manifold upper semisection is identical with the wall thickness of resonant cavity.

4. first quarter moon wedge shape resonant intake tube according to claim 1 and 2 is characterized in that: described pressure inlet connects the variable cross section pipeline that is become gradually square tube by pipe, and terminal flange is installed on the variable cross section pipeline.

5. first quarter moon wedge shape resonant intake tube according to claim 3 is characterized in that: described pressure inlet connects the variable cross section pipeline that is become gradually square tube by pipe, and terminal flange is installed on the variable cross section pipeline.

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