CN1094171C - A device for accelerating exhaust - Google Patents

Abstract

An exhaust acceleration device which is versatile, can obtain a certain exhaust effect even when the amount of exhaust varies to some extent, and is low in cost. The device includes: a tapered acceleration cylinder 10 having a connection portion 12 connected to the exhaust pipe 11 at one end, a jet port 13 for exhaust gas flow at the other end, and accelerating the exhaust gas flow from one end to the other end; a surrounding tube 20 surrounding the outside of the acceleration tube 10, forming an annular gap 21 continuous in the circumferential direction between the ejection ports 13, and provided with a through hole at the upstream of the acceleration tube 10; and an exhaust funnel 30. The suction exhaust gas flow and the accelerated exhaust gas flow are discharged to the atmosphere by the exhaust funnel 30 provided at the rear end of the shroud 20.

Description

A device for accelerating exhaust

The invention relates to a device for accelerating exhaust gas, by means of which it is possible to reduce the velocity of the exhaust air flow due to the damping of the accelerated exhaust system and to discharge this air flow into the atmosphere.

For example, in a piston engine, considering the efficiency of the engine, it is hoped that the exhaust gas can be quickly discharged from the cylinder to the atmosphere, but in order to keep the discharge position of the exhaust gas away from personnel, and in consideration of safety, the exhaust gas is used. Due to the additional installation of mufflers and catalytic devices on the exhaust pipe, the negative back pressure becomes too large, so that the exhaust is hindered and the exhaust efficiency is reduced. Based on this point, the present inventors have invented a device for discharging exhaust gas into the atmosphere under acceleration, and filed applications at home and abroad.

Among them are Patent Publication No. 7-42852 (Patent No. 2015958) and US Patent No. 5280143 based thereon. The purpose of these inventions is to fully utilize exhaust energy and effectively utilize the resulting negative pressure to improve exhaust efficiency. However, the devices of the above-mentioned invention and the previous related inventions have the unsolved problem that the number of parts is large, and there is also the problem that the effect that should be obtained cannot be obtained when the displacement of the piston engine changes, and the resulting problem It is necessary to set a variety of products according to the size of the displacement.

The present invention is made with the above-mentioned problems in mind, and it has versatility so that even if the exhaust volume varies to some extent, the corresponding effects can be obtained. Moreover, the present invention can use fewer types of products to meet the demands of different exhaust volumes. In addition, by reducing the number of parts, the purpose of cost reduction can also be easily achieved.

The present invention for solving the above-mentioned problems uses an acceleration cylinder to accelerate the exhaust gas flow. One end of the acceleration cylinder has a connecting portion connected to the exhaust pipe, and the other end has an exhaust injection port. Exhaust is accelerated to form a tapered peripheral wall surface with a gradually decreasing cross-sectional area of the flow path. On the peripheral wall surface at one end side, a through hole leading to the outside is opened. At the same time, a shroud and an exhaust tube are also provided. One end of the shroud is combined upstream of the through hole of the acceleration tube, and the other end surrounds the injection port of the acceleration tube to form an annular gap between them. The negative pressure generated by the acceleration of the exhaust gas flow can make the exhaust gas flow pass through the gap and The exhaust tube is connected to the opening part of the other end of the shroud, and the opening part is used to discharge the accelerated exhaust air flow injected from the injection port 13 and the suction exhaust air flow flowed out from the annular gap to the atmosphere Among them, the length of the exhaust tube can be set to a length at which the exhaust gas flow flowing downstream from the injection port 13 can contact the exhaust tube 30 .

The present invention is an exhaust facilitation device by which the velocity of the exhaust gas flow, which is reduced by the damping of the exhaust system, is accelerated and discharged into the atmosphere.

In terms of accelerating the flow velocity of the exhaust air flow and discharging this accelerated air flow into the atmosphere, the present invention inherits the basic principle developed by the inventor himself. That is, the present invention has the acceleration part A that accelerates the exhaust gas flow to the speed close to being discharged from the combustion chamber, the negative pressure suction part B that generates a strong negative pressure due to the acceleration, and discharges the high-speed exhaust gas flow into the atmosphere. The atmospheric discharge part C and the negative pressure suction part B have a structure in which the upstream is in communication with the exhaust gas flow before the maximum acceleration and provides a bypass for it.

With respect to the acceleration part A accelerating the main exhaust gas flow in the central part of the exhaust pipe, the low-speed exhaust gas flow near the exhaust pipe wall is accelerated by the suction effect of the negative pressure suction part B by means of the above-mentioned structure. . The flow velocity generated in the negative pressure suction part B approximately reaches the flow velocity generated in the acceleration part A, and the exhaust gas flow becomes a high-speed flow. The speed of this high velocity air flow can reach a speed range close to the speed of sound, which means that the present invention works with good efficiency close to the speed of the exhaust gas discharged from the cylinder. As a result, the flow velocity of the exhaust gas flow is increased, and the flow rate is increased.

Therefore, the exhaust accelerating device of the present invention must have a conical accelerating tube 10, a shroud 20 and an exhaust tube 30 arranged on the outside of the accelerating tube 10, and the exhaust tube 30 is used for the gas to be accelerated in the accelerating tube 10. The accelerated airflow and the suction exhaust airflow flowing out from the annular gap 21 between the accelerating cylinder 10 and the shroud 20 are discharged into the atmosphere. The acceleration cylinder 10 corresponds to the above-mentioned acceleration part A, the space between the acceleration cylinder 10 and the shroud 20, especially the vicinity of the annular gap 21 corresponds to the negative pressure suction part B, and the exhaust cylinder 30 corresponds to the air discharge part C.

The feature of the present invention is that the flow path of the conventional porous negative pressure suction part is only constituted by the annular gap 21 of the complete flow path, and the basic components of the device of the present invention are at least three in number. The annular gap 21 is continuous along the circumference, and there is no part obstructing the flow of the airflow, so it will not be affected by the change of the exhaust flow.

Fig. 1 is a sectional view showing Embodiment 1 of an exhaust acceleration device of the present invention;

Fig. 2 is a sectional view showing Embodiment 2 of the exhaust acceleration device of the present invention;

Fig. 3 is a cross-sectional view showing Embodiment 3 of the exhaust acceleration device of the present invention;

Fig. 4 is a sectional view showing Embodiment 4 of the exhaust acceleration device of the present invention;

Fig. 5 is a side view for explaining an installation example and operation of the device of the present invention.

Figure 1 shows Embodiment 1 of the device of the present invention. This device is made of three parts, and it comprises accelerating tube 10, shroud 20 and exhaust tube 30, and each part is a single structural body respectively.

One end of the acceleration tube 10 has a connection portion 12 connected to the exhaust pipe 11, and the other end has an exhaust injection port 13. In order to accelerate the exhaust gas flow flowing from one end to the other end, a flow path is formed between the two ends. The tapered wall surface 14 with gradually decreasing cross-sectional area is provided with a plurality of through holes 15 communicating with the outside on the wall surface at one end side. The exhaust gas flow bypassing the negative pressure portion B passes through the through hole 15 located at a radial position outside the inner diameter of the connection portion 12 . 16 is an inverted cone-shaped wall, which provides an enlarged cross-sectional area immediately behind the connecting portion, so that the exhaust gas flow expands here.

One end of the shroud 20 is connected to the acceleration cylinder 10 at the upstream of the through hole 15 , and the other end continues to the rear end of the acceleration cylinder to form an annular gap 21 with the outside of the injection port 13 . Therefore, the shroud 20 basically surrounds the accelerator tube 10 , and its front end 22 fits into the fitting recess 17 formed in front of the through hole of the accelerator tube 10 , so that the shroud 20 and the accelerator tube 10 are integrated. A space 24 is formed between the cylinder circumference portion 23 of the shroud 20 and the acceleration cylinder 10, so as to provide a bypass for attracting exhaust gas flow. Compared with the acceleration part, the cross-sectional area of the flow path in the space 24 shown gradually increases, but there are also configurations that are not like that. The rear end 25 of the shroud 20 is used for connecting the exhaust tube 30 .

When the exhaust gas flow is ejected from the injection port 13 in a state of being accelerated to the maximum in the accelerated portion, a negative pressure is generated behind it in proportion to the speed. In the present invention, this part is used as the annular gap 21 to increase the negative pressure area 31, and it does not become a damping component, so the negative pressure suction ability is significantly improved. Thus, it will be easy and versatile to cope with changes, especially increases, in the flow rate of the suction exhaust gas flow.

The accelerated exhaust gas flow and the suction exhaust gas flow are discharged from the exhaust stack 30 to the atmosphere as a high velocity exhaust gas flow. At this time, the high-speed exhaust gas flow diffuses downstream from the injection port 13 and is discharged into the atmosphere. Contact the resulting length. In this way, the outer peripheral portion 32 closes the rear negative pressure area 33 and can maintain a certain negative pressure. In addition, when the exhaust tube 30 does not close the above-mentioned outer peripheral portion 32, the desired effect cannot be fully achieved.

Fig. 2 shows Embodiment 2 of the device of the present invention, which is different from Embodiment 1 in that the shroud 20 is composed of a plurality of parts. Therefore, only the shroud 20 will be described in which the cylindrical body peripheral portion 23 is constituted by multiple inner and outer cylindrical bodies 29 - 1 , 29 - 2 , etc., and a single rear end member 27 is used. Among them, many small holes can be formed on the innermost cylinder. The multiple barrels 29 - 1 , 29 - 2 , etc. are kept concentric with the fitting recesses 17 ′, 27 ′ with their front ends 22 ′ and 25 ′, and are integrally connected by the connecting shaft 28 passing through the accelerating barrel 10 and the rear end member 27 .

Since other components may be the same as those in Embodiment 1, the same symbols are used and detailed description thereof is omitted. Compared with embodiment 1, this embodiment 2 is more suitable for large occasions. In addition, although the number of parts in the second embodiment is more than that in the first embodiment, since the cylinder body 29-1 and the like do not need to be processed, there are actually only three parts to be processed.

FIG. 3 shows Embodiment 3 of the device of the present invention, which is equivalent to setting a cooling cylinder 35 on the exhaust cylinder 30 of Embodiment 1. Therefore, the symbols for other components may be the same as those in Embodiment 1. The cooling tube 35 is made to have the same length as the exhaust tube 30 or slightly longer than the exhaust tube 30, and is connected to the installation part 36 of the rear end of the shroud with its front end. Exhaust gas temperature can be lowered by forming a negative pressure portion 37 at the rear end of the exhaust gas flow discharged into the atmosphere by the exhaust tube 30 and introducing external air from the air hole 38 between the exhaust tube 30 and the cooling tube 35 .

Fig. 4 shows Embodiment 4 of the device of the present invention, which is based on Embodiment 2 with an additional cooling cylinder 35, and a necked portion is formed at the rear end thereof, so that the effect of maintaining negative pressure is improved. Moreover, by utilizing the multiple structure of the shroud 20, the external air introduced by the front air inlet is input into the internal space 24 from the vent hole 41 formed on the innermost cylinder body 29-1, and by making it and the exhaust airflow generate a high speed Agitation reduces the temperature of the exhaust gas stream. Other constituent parts may be the same as those in Embodiment 2.

The device of the present invention with this structure, for example, when connected to the pipeline 11 of the automobile engine 40 exhaust system, load damping such as catalytic device 41 and noise reduction device 42 can be set between them, positioned at the end of the exhaust system or Downstream, the device of the present invention has the advantage of being extremely easy to install the aforementioned components. The exhaust gas discharged from the combustion chamber 43 of the engine 40 arrives at the device after the flow velocity is reduced by the above-mentioned load damping, and is accelerated to the limit state in the acceleration part A, which is close to the discharge speed of the cylinder. At the same time, in the wider area 31 A strong negative pressure is generated inside. Similar to the above-mentioned process, the negative pressure makes part of the exhaust gas flow before acceleration be sucked through the through hole 15, merge with the accelerated exhaust gas flow at the upstream part of the exhaust tube through the bypass, flow out as a high-speed exhaust gas flow diffusely, and be discharged to in the atmosphere. Therefore, the speed of exhaust into the atmosphere can be greatly accelerated, and the overall speed of the exhaust system can be improved. Because the exhaust port of the cylinder is involved, the combustion gas in the combustion chamber is quickly discharged and replaced with new air during the exhaust sequence. That is, the exhaust can be accelerated to the maximum extent.

The present invention is a device with the above content, therefore, compared with the conventional devices, with the maximum acceleration of the exhaust gas flow, a large amount of strong negative pressure will be generated and the annular gap will be maintained, therefore, although There is a degree of difference in the displacement of the engine, and the use of a device of the present invention is sufficient to cope with this difference. Therefore, the effect is that a device can be provided which can correspond to various engines with fewer product types, is more convenient to use, and is low in cost.

Claims (4)

1. device that quickens exhaust utilizes this device can quicken the speed of the exhaust airstream that the damping owing to vent systems reduces, and this air-flow is discharged in the atmosphere, and it is characterized in that: it comprises: quicken tube, enclose tube and exhaust pipe; Being constructed as follows of described acceleration tube: its end has the joint that connects outlet pipe, the other end has the jetburner of exhaust, in order to make the exhaust airstream acceleration that flows to the other end from an end, formed the taper wall that the cross sectional area of stream reduces gradually, at one end on the peripheral wall surfaces of side, have and lead to outside through hole; Describedly enclose being constructed as follows of tube: its end is combined on the acceleration tube of upstream end of through hole, its the other end surround the jetburner that quickens tube and its with quicken to form annular gap between the tube, make exhaust airstream by annular gap and through hole discharge by the negative pressure of quickening to be produced along with exhaust airstream; Being constructed as follows of described exhaust pipe: it links to each other with the opening portion of the other end that encloses tube, this opening portion is used for the exhaust airstream of the acceleration of will eject from jetburner and the attraction exhaust airstream that flows out from annular gap is discharged into atmosphere, and the length of exhaust pipe is set to the length that the exhaust airstream of discharging downstream from jetburner can contact with exhaust pipe.

2. according to the device of the acceleration exhaust of claim 1, utilize this device can quicken the speed of the exhaust airstream that the damping owing to vent systems reduces, and this air-flow is discharged in the atmosphere, it is characterized in that, it have taper the acceleration tube, be configured in this acceleration tube outside enclose tube and exhaust pipe, exhaust pipe is used for and will will be quickening acceleration air-flow that tube quickens and be discharged into the atmosphere from quickening tube and enclose the attraction exhaust airstream that the annular gap stream between the tube discharges.

3. according to the device of the acceleration exhaust of claim 1, it is characterized in that, in the outside of exhaust pipe, be provided with the cooling cylinder that encirclement exhaust pipe and rearward end exceed the exhaust pipe trailing edge overlappingly, extraneous gas imports on the periphery of exhaust pipe 30 from the pore that is formed on the cooling cylinder.

4. according to the device of the acceleration exhaust of claim 2, it is characterized in that, be directed to and quicken tube 10 and enclose between the tube 20, produce high-speed stirred with attracting exhaust airstream from extraneous gas being imported extraneous gas that the introducing port that encloses tube sucks.

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