KR100412599B1 - Muffler having changeable valve device - Google Patents

Abstract

An object of the present invention is to change the flow path of the exhaust gas in accordance with the operating conditions, and to change the opening and closing method of the variable valve indirectly to reduce the back pressure reduction, and to control the exhaust gas flow control of the structure that can reduce the vibration and noise of the valve To provide a muffler having a variable valve device for.

To this end, the present invention provides a cylinder for diffusing the exhaust gas to reduce pressure and noise, an exhaust gas introduction pipe for guiding the introduction of the exhaust gas into the cylinder, and a flow direction of the exhaust gas introduced through the exhaust gas introduction pipe. An exhaust gas flow diversion pipe installed to switch, an exhaust gas discharge pipe for guiding the exhaust gas passing through the flow diversion pipe to be discharged to the tail pipe side again, and partitioning the cylinder into a plurality of rooms; A muffler including a plurality of partition walls supporting each pipe, wherein the exhaust gas introduction pipe is formed with an exhaust passage for a high speed region for introducing a part of the exhaust gas into the frontmost chamber of the cylinder during high speed operation of the engine. It is characterized by.

Description

Muffler having changeable valve device for controlling flue gas flow

The present invention is directed to a muffler having a variable valve device for controlling the flow of exhaust gas discharged in response to an engine operating condition.

In general, the engine is slower than at high speeds because the engine is more exhausted at idle speeds or at low speeds than at high speeds with high exhaust pressure and large exhaust gases. The poetry is worse.

For this reason, in order to reduce vibration and noise in a specific operating region of the engine, FIG.

As shown in Fig. 8, the variable valve 42 which is opened and closed by the flow energy of the exhaust gas is attached to the end of the exhaust gas flow direction switching pipe 41 of the muffler 40, and the exhaust gas pressure at the time of idling and low speed operation. It is closed to minimize the open cross-sectional area of the exhaust gas flow diverting pipe 41 by the elastic force of the larger restoring spring 43, and when the engine is gradually driven at high speed, the exhaust gas pressure is linearly increased while being proportional thereto. Therefore, the opening amount of the variable valve 42 is also increased, so that the exhaust gas flow is suppressed during low speed operation of the engine to reduce exhaust noise (discharge noise), and the variable valve 42 opens wide at high speed to exhaust the exhaust gas. The pressure is reduced (exhaust resistance) to prevent the output from dropping.

However, according to the variable valve 42 mounted on the conventional muffler, the variable valve 42 is opened linearly by the exhaust gas pressure, but due to the restoring force of the restoring spring 43 installed in the variable valve 42. There is a disadvantage that the pressure loss of the exhaust gas by force is inevitable, and since the opening amount is controlled by the exhaust gas directly acting on the variable valve 42, the variable valve 42 immediately reacts to the tremor according to the pressure change of the exhaust gas. Vibration and noise are generated and as shown in FIG. 9, the frequency f1 with respect to the exhaust gas pressure wave and the frequency f2 of the recovery spring 43 of the variable valve coincide with each other to cause resonance. Has been pointed out the problem of increasing noise and vibration.

Accordingly, the present invention has been proposed in view of the above, and its object is to change the flow path of the exhaust gas according to the operating conditions, and to change the opening and closing method of the variable valve indirectly to reduce the back pressure, and to reduce the vibration of the valve. The present invention provides a muffler having a variable valve device for controlling exhaust gas flow having a structure capable of reducing noise.

The muffler having a variable valve device for exhaust gas flow control of the present invention for achieving the above object is a cylinder for diffusing the exhaust gas to reduce the pressure and noise, and the exhaust gas for guiding the introduction of the exhaust gas into the cylinder To change the flow direction of the introduction pipe, the exhaust gas flow conversion pipe installed to switch the flow direction of the exhaust gas introduced through the exhaust gas introduction pipe, and the exhaust gas passing through the flow conversion pipe again to be discharged to the tail pipe side. A muffler comprising a guided exhaust gas discharge pipe and a plurality of partition walls for partitioning the interior of the cylinder into a plurality of rooms, wherein the exhaust gas introduction pipe is arranged to communicate with the rearmost room in the cylinder. It is installed concentrically to surround the outer periphery of the exhaust gas introduction pipe, exhaust The inlet and the outlet are respectively provided with an exhaust pipe of a high speed region communicating with the exhaust gas introduction pipe and the foremost chamber of the cylinder, and a flat fan-shaped fixed plate provided with a plurality of spaces at regular intervals in the outer pipe, and the exhaust gas. A turbine runner rotatably installed by the exhaust gas in the inlet pipe, a rotary shaft supporting the turbine runner, and slit grooves formed in the exhaust gas introduction pipe from the end of the rotary shaft to reach the inner wall of the outer pipe in the high speed region. The rotation bar is formed to be stiff in the same angle as the fixed plate number at a predetermined angle, and is fixed to the outer end of the rotation bar to block the space between the fixed plate when the rotation bar is rotated from one end of the slit groove to the other end. Or move to a position that overlaps with the fixing plate. And a rotary open / close plate which opens the exhaust passage for the high speed region, and is fitted on the rotary shaft so that the turbine runner accumulates elastic force when rotating by the exhaust gas pressure so that the open / close plate blocks the exhaust gas passage of the outer pipe at all times. It consists of a torsion spring to be applied.

1 is a front sectional view showing a muffler having a variable valve device for controlling the exhaust gas flow according to the present invention.

2 is an enlarged view of main parts of the present invention;

3 is a view for showing the operating state of the variable valve device according to the present invention during the low, medium speed operation of the engine

4 is a view for showing an operating state of the variable valve device according to the present invention during the high speed operation of the engine

Figure 5 is a side cross-sectional view showing a slit groove of the exhaust gas introduction pipe of the present invention.

6 to 8 is a view showing the structure of a conventional variable valve device

9 is a graph showing the resonance state of the natural frequency of the valve spring to the engine pressure wave in the conventional variable valve device

※ Explanation of codes for main parts of drawing

1: muffler 2: cylinder

3: exhaust gas introduction pipe 4,4a: exhaust gas flow direction switching pipe

5: exhaust gas discharge pipe 6,7,8: room

10,11: bulkhead 13: exhaust gas inlet hole

14: Exhaust passage for high speed zone 15: Spacing (floating space)

16: fixed plate 17: variable valve device (16, 18, 19, 20, 22, 23)

18 turbine turbine runner 19

20: rotating rod 21: slit groove

22: rotary opening and closing plate 23: torsion spring

Hereinafter, the configuration and operation of the present invention will be described with reference to the accompanying drawings.

1 is a cross-sectional view showing a variable valve device for controlling the exhaust gas flow of the muffler according to the present invention, Figure 2 is a cross-sectional view AA of the in-phase muffler, Figure 3 is a detailed view of the main portion of the variable valve device of the present invention, Figure 4 Is a side view of the variable valve device of the present invention.

In Fig. 1, the muffler 1 introduces an exhaust gas introduction pipe 3 for guiding the introduction of the exhaust gas into a cylinder 2 connected in the middle of the exhaust system so as to lower the temperature and pressure of the exhaust gas exhausted from the engine to reduce noise. And exhaust gas flow switching pipes 4 and 4a and exhaust gas outlet pipes 5 which are provided in parallel with the exhaust gas introduction pipe 3.

Each of the pipes 3, 4, 4a, 5 divides the cylinder 2 into a plurality of chambers 6, 7, 8 and partition walls 10, 11. It is installed to be supported by.

Accordingly, the rear end of the exhaust gas introduction pipe 3 communicates with the third chamber 8, and the rear exhaust gas flow conversion pipe 5 of the front and rear exhaust gas flow conversion pipes 4 and 5 separated from each other is second. The chamber 7 and the third chamber 8 communicate with each other, and the front exhaust gas flow switching pipe 4 is provided so as to communicate with the first chamber 6 and the second chamber 7, and the exhaust gas outlet pipe 5 ) Is in communication with the first chamber (6).

An outer pipe 12 is concentrically installed on the tip portion 3a protruding forward of the cylinder 2 of the exhaust gas introduction pipe 3 so as to surround its outer circumference, and the outer pipe 12 and the tip of the pipe 3 ( An exhaust gas inlet hole 13 is formed at the connection point of 3a). The rear end of the outer pipe 12 communicates with the first chamber 6.

In addition, the exhaust passage 14 for the high speed region, which is a ring-shaped space formed by the outer pipe 12, has a predetermined interval 15, for example, three or 90 degrees at a 120 ° angle from the center point. Fan shape consisting of four angles ( Since the fixing plates 16 are fixedly installed, the exhaust gas can pass through only the space 15 formed between the adjacent fixing plates 16.

In addition, a variable valve device 17 is installed in the tip portion 3a. A turbine runner 18, which is rotated by the flow rate of the exhaust gas passing through, is mounted at the tip of the rotary shaft 19, and the rotary shaft 19 At the rear end of the fixed plate 16, the rotation bar 20 which is radially stiffened by dividing 360 degrees by the number of fixed plates 16 is fixed.

The pivoting rods 20 respectively penetrate through the slit grooves 21 formed in the front end portion 3a of the space 15 moved sideways from the position in contact with the front surface of the fixing plate 16 to the inner surface of the outer pipe 12. It protrudes and extends, and the rotary opening / closing plates 22 having the same shape as the fan-shaped space 15 (as shown in FIG. 4) are fixed to each of the pivoting rods 20.

In addition, the torsion spring 23 is installed in the rotation shaft 19 to be twisted when the turbine runner 18 is rotated by the exhaust gas, thereby accumulating a torsional elastic force therein, and applying the force to the turbine runner 18 to its original position. It is.

Referring to the operation of the device of the present invention having such a configuration as follows.

When the engine is driven at a low speed, since the flow velocity and pressure of the exhaust gas discharged are low, the torsion spring force of the torsion spring 23 is larger than the exhaust gas force, so that the turbine runner 18 does not rotate. The rotary opening and closing plate 22, which is a variable valve for opening and closing the valve, is located in the space 15, and the exhaust gas passage 14 for the high speed region is in a blocked state (see FIG. 3).

Therefore, the exhaust gas flows into the third chamber 8 only through the exhaust gas introduction pipe 3 and then through the exhaust gas diverting pipes 4 and 4a, the second chamber 7 and the first chamber 6. The noise is attenuated while being introduced and spread in order, and is discharged to the atmosphere through the discharge pipe 5.

However, when the engine is operated at a high speed, a large amount of exhaust gas is generated and discharged at a high speed and high pressure. Therefore, it is insufficient to flow into the third chamber 5 through the exhaust gas introduction pipe 3 and to be treated. The turbine runner 18 rotates, and the rotation rods 20 rotate by moving from one side 21a of the slit groove 21 to the other side 21b.

Accordingly, the opening / closing plate 22 moves to overlap the front surface of the fixed plate 16 so that the exhaust passage 14 for the high speed region is opened, and a part of the exhaust gas passes through the exhaust passage 14 for the high speed region. Since it is introduced into the chamber (6) is to effectively reduce the back pressure (see Figure 4).

In this way, the present invention is an indirect method in which the opening and closing operation of the rotary opening and closing plate 22 is caused by sliding in a direction perpendicular to the flow direction by the turbine runner 18, even if the exhaust pressure is changed, so that the opening and closing plate 22 is closed. Shake and instability don't have to worry.

The present invention as described above allows the exhaust gas to be discharged along a path designed for its discharge during low-speed operation of the engine with a low exhaust gas discharge rate and a low flow rate and pressure, and has a high exhaust gas discharge rate and a high flow rate and pressure. During high speed operation, the rotary opening and closing plate as a variable valve for opening the exhaust passage for the high speed region is opened in conjunction with the turbine runner rotated by the exhaust gas so as to interact with the torsion spring when the exhaust pressure changes. By opening and closing the rotary opening and closing plate by the indirect method to slide in a direction perpendicular to the exhaust gas flow direction, even if the exhaust gas pressure fluctuates severely, the vibration of the rotary opening and closing plate, which is a variable valve, does not occur, so that vibration and noise do not occur. It works.

Claims (4)

A cylinder for diffusing the exhaust gas to reduce pressure and noise, an exhaust gas introduction pipe for guiding the introduction of the exhaust gas into the cylinder, and an exhaust gas installed to change the flow direction of the exhaust gas introduced through the exhaust gas introduction pipe A gas flow diversion pipe, an exhaust gas discharge pipe for guiding the exhaust gas passing through the flow diversion pipe to be discharged to the tail pipe side again, and the cylinder inside are divided into a plurality of rooms to support the pipes. In the muffler including a plurality of partitions to be, The exhaust gas introduction pipe is provided with a variable valve device for exhaust gas flow control, characterized in that a high speed region exhaust passage for introducing a portion of the exhaust gas into the frontmost chamber of the cylinder during the high speed operation of the engine. Muffler. The method of claim 1, The exhaust gas passage for the high speed region is formed at the outer periphery of the tip of the exhaust gas introduction pipe, and the exhaust gas passage for the high speed region is closed in the exhaust gas introduction pipe and the exhaust gas passage for the high speed region during low speed operation, and the high speed operation is performed. A muffler having a variable valve device for exhaust gas flow control, characterized in that a variable valve device for opening at the time is provided. The method of claim 2, The variable valve device is a muffler having a variable valve device for controlling the exhaust gas flow, characterized in that it comprises a turbine runner for opening the valve by rotating by the flow energy of the exhaust gas when the exhaust gas flow rate is above the reference value. The method of claim 3, wherein The exhaust gas introduction pipe is disposed so as to communicate with the rearmost chamber in the cylinder, and is installed concentrically to surround the outer periphery of the exhaust gas introduction pipe, and an exhaust gas inlet and an outlet are respectively located in the exhaust gas introduction pipe and the foremost chamber of the cylinder. A fan-shaped fixed plate having an outer pipe of a high-speed area in communication therewith, the plurality of which are provided at a predetermined interval in the outer pipe, and a turbine runner rotatably installed by the exhaust gas in the exhaust gas introduction pipe; A rotating rod supporting the turbine runner and slit grooves formed in the exhaust gas introduction pipe from the end of the rotating shaft to be stiffly radially stiffly equal to the fixed plate number at an angle to reach the inner wall of the outer pipe of the high speed region. And, the rotation rod is fixed to the outer end of the rotation rod A rotary opening / closing plate which blocks the space between the fixed plates or moves to an overlapping position with the fixed plate when the slit groove is rotated from one end to the other end, and opens the exhaust passage for the high speed area, and is fitted on the rotating shaft. The turbine runner is configured to include a torsion spring which is always applied to the opening and closing plate to block the exhaust gas passage of the outer pipe by accumulating the elastic force when rotating by the exhaust gas pressure for exhaust gas flow control Muffler with variable valve device.