CN102678400A - Hydraulic drive continuously variable gas inlet system - Google Patents

Abstract

The purpose of the present invention is to provide a hydraulically driven stepless variable intake system, comprising an intake manifold, a resonant cavity, an intake manifold, and a hydraulic chamber, the intake manifold, a resonant cavity, and an intake manifold are connected in sequence, and the intake manifold The length is variable, and the hydraulic cavity is set on the intake manifold to adjust the length of the intake manifold. Under different working conditions, by changing the length of the resonant intake pipe, the present invention can achieve a better resonance effect in a wide engine speed range, improve the intake efficiency of the gas engine, thereby increasing the output power and improving the economy.

Description

Hydraulic drive infinitely variable intake system

technical field

The invention relates to an engine, in particular to an intake system of the engine.

Background technique

With the development of the economy, the shortage of oil and environmental pollution are becoming more and more prominent. The development and use of new energy is an inevitable choice for human beings. The advantages of natural gas resources, such as rich resources, low emission pollution, and cheap prices, are increasingly valued by people. Therefore, natural gas engines have Wide market application prospects.

At present, gas engines are mainly converted from diesel engines or gasoline engines. Due to the formation of a mixed gas engine outside the cylinder, the gas fuel occupies a certain amount of intake air, so that the amount of air inhaled by the gas engine is higher than that of diesel engines and diesel engines under the same working conditions. There are fewer gasoline engines, so the power density of gas engines is usually about 10% lower than gasoline and diesel engines. The periodic opening and closing of the intake valve of the four-stroke engine and the reciprocating motion of the piston cause the gas in the intake passage to fluctuate strongly. The wave energy is used to increase the intake air volume, thereby increasing the power of the gas engine, and the corresponding speed is the resonance speed. The resonance speed is related to the structure of the intake system. The intake system mainly includes three parts: the intake manifold, the resonant cavity and the intake manifold. Generally, the resonance effect is enhanced by changing the lengths of the intake manifold, the resonant cavity and the intake manifold. The length has the most obvious effect on enhancing the resonance. The patent US6508331B1 changes the gas channel by adjusting the position of the retaining wall, but it is mainly used for noise reduction; the patent US2008066999A1 changes the structure of the intake system by adjusting the opening of the valve, but its main purpose is also to eliminate noise and increase the intake air volume. Little impact; the patent US0168961A1 achieves the purpose of increasing the intake air by changing the structure of the intake system used by the intake through hole, but it is not continuously adjustable. The currently applied resonant intake system with variable intake manifold length changes the length of the intake manifold by changing the flow path of the intake air. Since the intake manifold includes two or three intake manifolds with different paths, The air intake system is large in size and weight, takes up a lot of space, and can only realize two-stage or three-stage variable manifold length, and the length of the intake manifold cannot be continuously changed, so the optimal resonance can only be achieved at several operating points air intake.

Contents of the invention

The purpose of the present invention is to provide a hydraulically driven infinitely variable intake system that can continuously adjust the length of the intake manifold within a wide range.

The purpose of the present invention is achieved like this:

The hydraulically driven stepless variable intake system of the present invention includes an intake manifold, a resonant cavity, and an intake manifold, and is characterized in that: it also includes a hydraulic cavity, the intake manifold, the resonant cavity, and the intake manifold are connected in sequence, and the intake manifold The length of the pipe is variable, and the hydraulic cavity is set on the intake manifold to adjust the length of the intake manifold.

The present invention may also include:

1. The intake manifold includes the front section of the intake manifold, the middle section of the intake manifold, and the rear section of the intake manifold. The middle section of the intake manifold includes the outer tube of the middle section of the intake manifold and the inner tube of the middle section of the intake manifold. , the front section of the intake manifold is connected to the resonant cavity and the outer pipe of the middle section of the intake manifold, the rear section of the intake manifold is connected to the inner pipe of the middle section of the intake manifold, a groove is set on the inner pipe of the middle section of the intake manifold, and the first seal is installed in the groove The outer tube of the middle section of the intake manifold is sleeved on the inner tube of the middle section of the intake manifold through the sealing ring, and is continuously moved under the drive of the hydraulic chamber to change the length of the intake manifold, and maintain a seal with the inner tube of the middle section of the intake manifold.

2. The section of the hydraulic chamber is fan-shaped and the end face is circular. The hydraulic chamber is provided with a hydraulic oil channel, and the two ends of the hydraulic chamber are provided with grooves for sealing and guiding; the outer part of the middle section of the intake manifold is A drive ring is set on the pipe, and the drive ring is provided with installation grooves for placing the second and third seal rings and retaining rings. The second and third seal rings are close to the inner wall of the hydraulic chamber, and the drive ring is located on the outer tube of the middle section of the intake manifold. In the middle part, the end surfaces on both sides of the driving ring are respectively perpendicular to the center line of the outer tube in the middle section of the intake manifold to ensure that the hydraulic driving force is always consistent with the movement direction of the outer tube in the middle section of the intake manifold.

3. It also includes a displacement measuring device. One end of the displacement measuring device is fixed on the outer pipe in the middle section of the intake manifold, and the other end is fixed on the inner pipe in the middle section of the intake manifold.

4. The centerlines of the hydraulic chamber, the outer tube in the middle section of the intake manifold and the inner tube in the middle section of the intake manifold are arc lines with the same curvature.

The advantage of the present invention is that: under different working conditions, by changing the length of the resonant intake pipe, the present invention can achieve a better resonance effect in a wide engine speed range, improve the intake efficiency of the gas engine, and thereby increase the output Power, improved economy.

Description of drawings

Fig. 1 is the general structural diagram of the present invention;

Figure 2 is a schematic diagram of the connection of the intake manifold, the resonance cavity, and the front section of the intake manifold;

Fig. 3 is a structural diagram of the outer pipe in the middle section of the intake manifold;

Figure 4 is a structural diagram of the inner tube in the middle section of the intake manifold;

Fig. 5 is a sectional view of the connection between the inner pipe and the outer pipe in the middle section of the intake manifold;

Fig. 6 is a schematic diagram of displacement sensor installation;

Fig. 7 is a structural diagram of the outer pipe of the rear section of the intake manifold;

Fig. 8 is a sectional view of the hydraulic chamber.

Detailed ways

The present invention is described in more detail below in conjunction with accompanying drawing example:

1 to 8, the present invention includes an intake manifold 1, a resonant cavity 2, an intake manifold front section 3, an intake manifold middle section outer tube 4, a hydraulic chamber 5, a hydraulic drive unit 6, a hydraulic control unit 7, an intake manifold The inner pipe 8 in the middle section of the manifold, the displacement measuring device 9 and the rear section 10 of the intake manifold. It is characterized in that: the front section 3 of the intake manifold, the outer tube 4 in the middle section of the intake manifold, the inner tube 8 in the middle section of the intake manifold and the rear section 10 of the intake manifold together constitute the intake manifold, and the outer tube in the middle section of the intake manifold 4 and the inner tube 8 in the middle section of the intake manifold can move relatively continuously, and the length of the intake manifold changes. Under different working conditions, under the control of the hydraulic control unit 7, the hydraulic drive unit 6 changes the length of the middle section of the intake manifold, and the displacement measuring device 9 detects the length of the middle section of the intake manifold in real time.

The intake manifold 1 and the resonant cavity 2 are cast as one, the center line of the intake manifold 1 coincides with the resonance cavity centerline, the inner cavity of the intake manifold is circular, and the front end of the intake manifold has a connecting flange. The inner cavity of the resonant cavity 2 is a rectangle with excessively large rounded corners, one end is connected with the intake manifold 1, and the other end is connected with the front section 3 of the intake manifold. The front sections 3 of the four intake manifolds are of the same size, and the radial section of the inner cavity is circular. The inner pipe 8 in the middle section of the intake manifold is installed in the outer pipe 4, and the outer pipe 4 is assembled in the hydraulic chamber 5, and the centerlines of the outer pipe 4, the hydraulic chamber 5 and the inner pipe 8 coincide. The inner pipe 8 in the middle section is connected to the rear section 10 of the intake manifold through a flange, the rear section 10 of the intake manifold is fixed on the engine cylinder head through a flange, the hydraulic chamber 5 is fixed through a bracket, and the outer pipe 4 is connected to the Relative movement of the inner tube 8 occurs, and the length of the manifold changes. There is a drive ring with a certain thickness on the outer wall of the outer tube 4 in the middle section of the intake manifold. The drive ring is located in the middle of the outer tube 4. The end faces on both sides of the drive ring are respectively perpendicular to the center line of the outer tube 4 to ensure that the hydraulic driving force is always in line with the outer tube 4. The direction of motion of the pipe 4 is the same, and the driving ring is processed with a sealing ring installation ring groove. Each inner pipe 8 is provided with a flange at the end connected to the rear section 10 of the intake manifold, and the end of each inner pipe 8 that cooperates with the outer pipe 4 is processed with a sealing ring installation groove. The centerline of the hydraulic chamber 5 is a circular arc line with the same curvature as the centerline of the outer pipe 8 and the inner pipe 4. The two sides of the hydraulic chamber 5 have pipelines that cooperate with the outer pipe 8. The inner wall of the pipeline is processed for dustproof, Ring groove for guide and sealing ring, and the other ends of the two pipes have flanges for fixing. The displacement measuring device 9 adopts a variable internal resistance displacement sensor, and the two ends of the sensor are respectively fixed on the inner pipe 8 and the outer wall of the outer pipe 4 in the middle section of the intake manifold. The signal output by the displacement sensor varies with the relative position of the outer pipe 4 and the inner pipe 8 The hydraulic control unit 7 calculates the length value of the intake manifold according to the signal of the displacement sensor. According to different working conditions, the hydraulic control unit 7 adjusts the relative position of the outer pipe 4 and the inner pipe 8 in the middle section of the intake manifold, and calculates the relative position of the outer pipe 4 and the inner pipe 8 according to the signal of the displacement sensor, so as to realize the adjustment of the length of the intake manifold. Adjusted closed-loop control.

Referring to Fig. 2, the intake manifold, the resonant cavity, and the front section of the intake manifold are cast as one, the centerline of the intake manifold 1 coincides with the centerline of the resonance cavity, the inner cavity of the intake manifold is circular, and there is a connecting flange 11 at the front end of the manifold; The inner cavity of the resonant cavity 2 is a rectangle with excessively large rounded corners, one end is connected with the intake manifold 1, and the other end is connected with the front section 3 of the intake manifold. The front sections 3 of the four intake manifolds have the same size, and the radial section of the inner cavity is circular.

Referring to Figure 3, the centerline of the outer tube 4 in the middle section of the intake manifold is a circular arc, the radial section of the inner cavity is circular, and the outer wall of the outer tube 4 has a driving ring with a certain thickness, and the driving ring is located in the middle of the outer tube 4 , the end surfaces on both sides of the drive ring are perpendicular to the center line of the outer tube 4 respectively to ensure that the hydraulic driving force is always consistent with the movement direction of the outer tube 4. The drive ring is processed with three installation grooves 14, 15, 16 for the installation grooves 14 and 16 For installing the sealing ring, the installation groove 15 is used for installing the retaining ring, one end of the middle section outer pipe 4 is connected with the front section 3 of the intake manifold through the flange 13, and the other end is connected with the middle section inner pipe 8 through the sealing ring.

Combining Figure 2 and Figure 3, there is a gasket at the joint of the two flanges to ensure the airtightness of the joint.

4 and 5, the centerline of the inner tube 8 in the middle section of the intake manifold is a circular arc, the radial section of the inner cavity is circular, and one end of the inner tube 8 is connected to the rear section 10 of the intake manifold through a flange 17, and the other There is a sealing ring installation groove on the outer wall of one end, which is used for installing the sealing ring to realize the sealed connection between the inner pipe and the outer pipe.

Referring to Fig. 6, one end of the displacement measuring device 9 is fixed on the outer pipe 4, and the other end is fixed on the inner pipe 8, and the signal output by the displacement sensor changes with the change of the relative positions of the outer pipe 4 and the inner pipe 8 in the middle section of the intake manifold. , the hydraulic control unit 7 calculates the relative position of the outer tube 4 and the inner tube 8 according to the signal of the displacement sensor, thereby calculating the length of the intake manifold.

Referring to Fig. 7, the centerline of the rear section 10 of the intake manifold gradually transitions from a circular arc to a straight line, one end is connected to the inner pipe 8 in the middle section of the intake manifold through a flange 21, and the other end is connected to the engine through a flange 20. The radial section of the cavity gradually transitions from a circle connected with the middle section inner pipe 8 to a square connected with the engine.

Combining Figure 4 and Figure 7, there is a gasket at the joint of the two flanges to ensure the airtightness of the joint.

With reference to Fig. 8, the center line of the inner cavity of the hydraulic chamber 5 is a circular arc, the radial section of the middle section of the inner cavity is circular, and there are hydraulic oil passages 22, 27, the radial sections of the two sides of the inner cavity are circular, and the sections on both sides are circular. The radial cross-section of the midpoint of the middle section is symmetrical, and each side of the inner cavity is provided with a guide bearing ring installation groove 26, a piston rod seal installation groove 25 and a dust ring installation groove 24; each side is also provided with a hydraulic chamber fixing method Lan23.

Referring to Fig. 3, Fig. 4 and Fig. 8, the centerlines of the hydraulic chamber 5, the outer tube 8 and the inner tube 4 are arc lines with the same curvature.

Under the control of the hydraulic control unit 7, according to different working conditions, the hydraulic drive unit 6 adjusts the flow direction and flow rate of the hydraulic oil, thereby adjusting the length of the middle section of the intake manifold, and the displacement measuring device 9 detects the length of the middle section of the intake manifold in real time. length, to achieve closed-loop control of intake manifold interruption adjustment.

Claims (8)

1. The hydraulically driven infinitely variable intake system includes an intake manifold, a resonant cavity, and an intake manifold. The length of the pipe is variable, and the hydraulic cavity is set on the intake manifold to adjust the length of the intake manifold. 2. The hydraulically driven infinitely variable intake system according to claim 1, characterized in that: the intake manifold includes a front section of the intake manifold, a middle section of the intake manifold, and a rear section of the intake manifold. The middle section of the air manifold includes the outer pipe of the middle section of the intake manifold and the inner pipe of the middle section of the intake manifold. Inner pipe, a groove is set on the inner pipe in the middle section of the intake manifold, and the first sealing ring is installed in the groove, and the outer pipe in the middle section of the intake manifold is sleeved on the inner pipe in the middle section of the intake manifold through the sealing ring, and moves continuously under the drive of the hydraulic chamber Thereby changing the length of the intake manifold and keeping the seal with the inner pipe in the middle section of the intake manifold. 3. The hydraulically driven stepless variable air intake system according to claim 1 or 2, characterized in that: the section of the hydraulic chamber is fan-shaped, the end face is circular, and a hydraulic oil channel is arranged on the hydraulic chamber, and the hydraulic chamber The two ends are provided with grooves for sealing and guiding; the outer tube of the middle section of the intake manifold is provided with a driving ring, and the driving ring is provided with installation grooves for placing the second and third sealing rings and retaining rings. 2. The third sealing ring is close to the inner wall of the hydraulic chamber. The driving ring is located in the middle of the outer pipe in the middle section of the intake manifold. The direction of movement of the outer pipe in the middle section of the intake manifold is consistent. 4. The hydraulically driven stepless variable intake system according to claim 2, further comprising a displacement measuring device, one end of the displacement measuring device is fixed on the outer tube of the middle section of the intake manifold, and the other end is fixed on the intake manifold. On the inner tube in the middle of the tube. 5. The hydraulically driven stepless variable intake system according to claim 3, further comprising a displacement measuring device, one end of the displacement measuring device is fixed on the outer pipe in the middle section of the intake manifold, and the other end is fixed on the intake manifold. On the inner tube in the middle of the tube. 6. The hydraulically driven infinitely variable intake system according to claim 2, characterized in that: the centerlines of the hydraulic chamber, the outer tube in the middle section of the intake manifold and the inner tube in the middle section of the intake manifold have the same curvature arc line. 7. The hydraulically driven infinitely variable intake system according to claim 3, characterized in that: the centerlines of the hydraulic chamber, the outer tube in the middle section of the intake manifold and the inner tube in the middle section of the intake manifold have the same curvature arc line. 8. The hydraulically driven infinitely variable intake system according to claim 4 or 5, characterized in that: the centerlines of the hydraulic chamber, the outer tube in the middle section of the intake manifold and the inner tube in the middle section of the intake manifold are curvature the same arc.

Images