JPH0417774Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to an exhaust gas evacuation device for a vehicle.

``Prior art'' and ``Problems to be solved by the invention'' In the case of normal exhaust pipes installed in vehicles, the sparks contained in the engine exhaust gas are discharged together with the gas. Ru. Therefore, it is extremely dangerous to operate a vehicle equipped with such an exhaust pipe at an airport, oil depot, or other location where flammable hazardous materials are handled, as there is a risk of explosion, fire, or other accidents.
In many places where flammable hazardous materials are handled, from a safety standpoint, vehicles entering and exiting are required to be equipped with devices to prevent the emission of sparks.

Therefore, various types of spark discharge prevention devices are available that can be easily installed at the rear end of the exhaust pipe, remove sparks from the exhaust gas, and discharge only the gas. When an emission prevention device is installed, a load is placed on the engine, resulting in a corresponding drop in output. The drawback of poor fuel efficiency was pointed out.

Therefore, when vehicles enter and work in areas where flammable hazardous materials are handled, sparks from the exhaust gas must be removed and only the gas must be discharged. In addition, it was necessary to provide an exhaust gas exhaust device that can function as a normal exhaust pipe when driving on general roads.

Therefore, as an exhaust gas discharging device having the above function, conventionally, for example, as shown in FIG.
An exhaust pipe C equipped with a spark discharge prevention device B is provided,
In addition, a switching valve D is disposed downstream of the branching part of the exhaust pipe C in the exhaust pipe A, and by switching the switching valve D, the exhaust gas discharge flow path is switched to the exhaust pipes A and C, thereby preventing ignition. In areas where hazardous materials are handled, exhaust gas is routed through exhaust pipe C, and sparks from the exhaust gas are removed by spark discharge prevention device B, so that only the gas is exhausted. An exhaust gas exhaust device E is provided which is configured to discharge exhaust gas from an exhaust pipe A when the vehicle is traveling.
It is necessary to install two exhaust pipes A and C in parallel, and therefore a large space is required to install the exhaust gas evacuation device E, which makes it impossible to install it depending on the vehicle model. It has been pointed out that it is expensive due to its complicated structure and troublesome installation work, and that it is difficult to perform a simple manual switching operation due to the location of the switching valve D. It had been.

This idea was created in view of the above circumstances,
The purpose is to have a simple structure, do not require a particularly large space for installation, and be easy to install.Furthermore, with a simple switching operation, only gas can be discharged, and it can be used with a normal exhaust pipe. An object of the present invention is to propose an exhaust gas evacuation device for a vehicle that can be used as an exhaust pipe having the same function.

"Means for Solving the Problems" The present invention has been made to achieve the above object. It is installed in vehicles that enter and exit places where flammable hazardous materials are handled, such as airports and oil depots, as well as traveling on general roads.It can also be used as a spark discharge prevention device, and of course can also be used as a normal exhaust pipe. The present invention relates to a possible exhaust gas evacuation device in a vehicle. In this exhaust gas exhaust device, an outlet pipe is attached to one end of the outer cylinder, an inlet pipe is attached to the other end of the outer cylinder by fitting the rear end into the outer cylinder, and the rear end of the inlet pipe is attached to the other end of the outer cylinder. A switching valve configured to be operable outside the outer cylinder is disposed on the downstream side of the section, and an opening opening toward the peripheral wall of the outer cylinder is provided on the upstream side of the switching valve. A gas discharge part is provided. The switching valve is opened when the vehicle enters a place where flammable hazardous materials are handled, that is, when the device also functions as a spark discharge prevention device. Further, the gas discharge section includes a plurality of discharge pipes extending along the circumferential direction of the outer cylinder and curved in the same direction, communicating with the inlet pipe and protruding from each other, the opening tips of each of which are curved in the same direction. They are arranged at predetermined intervals.

"Operation" Since the present invention consists of the above-mentioned means, it functions as follows. That is, for example, when entering a place where flammable hazardous materials are handled, by operating a switching valve installed at the rear end of the inlet pipe to close the inlet pipe,
Up until now, the flow has been guided by the inlet pipe, once released from the open end toward the rear end of the outer cylinder, then flowed inside the outer cylinder roughly along its longitudinal direction, and then passed through the outlet pipe to the outside. Since the inlet pipe is closed, the exhaust gas containing sparks that has been discharged has its flow path changed, and is now discharged from the gas discharge portion toward the peripheral wall of the outer cylinder. Now, here, this gas discharge section is made up of a plurality of discharge pipes that extend along the circumferential direction of the outer cylinder and are curved in the same direction. Therefore, firstly, each discharge pipe can guide and discharge exhaust gas very close to the peripheral wall of the outer cylinder, which is cooled in the outside air, so the exhaust gas cooling effect is excellent.
Secondly, since each discharge pipe is curved, the discharged exhaust gas forms a swirling flow, and the sparks in the exhaust gas are subject to centrifugal force and are likely to be collected on the peripheral wall of the outer cylinder. It also has an excellent cooling effect for exhaust gas from the surface. Thirdly, since each discharge pipe is similarly curved, the discharged exhaust gas collides with the peripheral wall of the outer cylinder and flows back toward the discharge pipe side. This allows the exhaust gas to flow smoothly along the peripheral wall of the outer cylinder, and the exhaust gas has an excellent cooling effect from this aspect as well. Now, the exhaust gas released from the gas discharge part flows along the circumferential wall of the outer cylinder, and in this process, the sparks are either completely burned out, or they are absorbed by the circumferential wall of the outer cylinder. They cool and disappear, and most of the remaining particles accumulate at the bottom of the outer cylinder. The gas from which sparks have been removed is sequentially discharged to the outside through an outlet pipe. Therefore, when the inlet pipe is closed by the switching valve, no sparks are discharged to the outside.

Furthermore, when driving on general roads, the exhaust gas flows straight through the inlet pipe by opening the switching valve and is once released into the outer cylinder. It flows along its length and is subsequently discharged to the outside through an outlet pipe, so that no load is placed on the engine.

In this way, by simply switching the switching valve, it is possible to prevent sparks from being discharged and to use the pipe as a normal exhaust pipe.

Furthermore, the space required for installation is almost the same as in the case of a normal exhaust pipe.

"Embodiments" The present invention will be described below based on embodiments shown in the drawings.

FIG. 1 is a longitudinal sectional view of an exhaust gas evacuation device according to the present invention.

In the figure, 1 is an exhaust gas exhaust device of a vehicle (not shown). This exhaust gas evacuation device 1 is first installed in a vehicle that travels in and out of places where flammable hazardous materials are handled, such as airports and oil depots, as well as traveling on general roads. The exhaust gas exhaust device 1, which can be used not only as a spark discharge prevention device but also as a normal exhaust pipe, is constructed as follows. That is, 2 is an outer cylinder with a circular cross section, and this outer cylinder 2 is formed by connecting end members 2b, 2b formed in a funnel shape to both ends of a cylindrical main body 2a, Attachment holes 2 for attaching an inlet pipe 3 and an outlet pipe 4, which will be described later, are provided at the reduced diameter ends of the end members 2b and 2b, respectively.
c, 2c are formed.

Reference numeral 3 designates an inlet pipe, and the rear end 3a of the inlet pipe 3 is inserted into the upstream side of the outer cylinder 2 in such a positional relationship that their axes coincide with each other, and the outer circumference of the inlet pipe 3 is inserted into the mounting hole 2.
It is attached to the outer cylinder by fixing to c. Further, the outlet pipe 4 has its upstream end connected to the outer cylinder 2.
It is attached to the outer cylinder 2 by fitting into the attachment hole 2c on the downstream side. Therefore, inlet pipe 3
The open end of the outlet pipe 4 and the open end of the outlet pipe 4 maintain a positional relationship in which they are located opposite to each other.

Reference numeral 5 denotes a butterfly valve disposed at the downstream end of the rear end 3a of the inlet pipe 3, and the butterfly valve 5 can be operated from outside the outer cylinder 2 by an operating mechanism 6, which will be described later.

Reference numeral 17 denotes a gas discharge section provided on the upstream side of the butterfly valve 5 at the rear end 3a of the inlet pipe 3 for discharging exhaust gas toward the circumferential wall of the main body 2a of the outer cylinder 2.

6 is an operating mechanism for switching the butterfly valve 5, and this operating mechanism 6 is constructed as follows. That is, 9 is an insertion hole for the operating rod 10 drilled in the main body 2a of the outer cylinder 2 at a portion corresponding to the valve shaft 5a of the butterfly tie valve 5, and 11 is a support member having a guide hole 11a for the operating rod 10 at its center. and this support member 11 has its guide hole 1
1a and the insertion hole 9 are fixed to the outer periphery of the outer tube 2 in a corresponding positional relationship. The operating rod 10 has its base end connected to the valve shaft 5a, and is disposed so as to pass through the insertion hole 9 and the guide hole 11a.
It is supported by a packing 12 fitted inside, and a handle 13 is fixed to its protruding tip. 14 is a packing presser screwed onto the threaded portion 11b of the support member 11.

Note that 15 is a dust removal plug provided at the lower end of the main body 2a of the outer cylinder 2.

In the embodiment, an explanation has been given of the operation mechanism 6 configured to open and close the butterfly valve 5 on the outside of the outer cylinder 2. However, the configuration of the operation mechanism is not limited to the embodiment. It may be configured to be performed at the lower side.

FIG. 2 is a longitudinal cross-sectional view of the main part of the gas discharge part 17, and the gas discharge part 17 is arranged along the circumferential direction of the outer cylinder 2 at equal intervals at four locations on the top, bottom, left and right of the inlet pipe 3. four discharge pipes 18 curved in the same direction;
18... are constructed so as to protrude in communication with the inlet pipe 3, and as shown in the figure, the opening tips of each are arranged at a predetermined distance from the circumferential wall of the main body 2a of the outer cylinder 2. There is.

As explained above, the present invention provides the butterfly valve 5 on the downstream side of the rear end 3a of the inlet pipe 3 fitted in the outer cylinder 2, and the gas discharge part 17 on the upstream side thereof. Since it is configured to be operated outside the outer cylinder 2, when the butterfly valve 5 is open, the inside of the inlet pipe 3 can be operated from the rear end 3.
Since the butterfly valve 5 is open, the exhaust gas that has flowed in the direction of the arrow up to a continues to flow to the rear end 3.
It flows in a straight line inside a and is discharged into the outer cylinder 2 from the open end. The exhaust gas released into the outer cylinder 2 flows inside the outer cylinder 2 substantially along its longitudinal direction, and is discharged to the outside from the outlet pipe 4. Therefore, no load is applied to the engine, and in this state it functions as a normal exhaust pipe.

In addition, when the butterfly valve 5 is closed and the downstream end of the rear end 3a is closed, the inlet pipe 3
Since the downstream end of the rear end 3a is closed, the exhaust gas that has flowed in the direction of the arrow inside to the rear end 3a is forced to change its flow path, and passes through the gas discharge part 17 to the outer cylinder. The liquid is emitted toward the peripheral wall of the main body 2a inside the main body 2a. Now, here, this gas discharge part 17
consists of a plurality of discharge pipes 18, 18, 18, . . . which extend along the circumferential direction of the outer cylinder 2 and are curved in the same direction. That is, firstly, each discharge pipe 18, 18...
... allows the exhaust gas to be guided very close to the peripheral wall of the main body 2a of the outer cylinder 2 which is cooled by the outside air, that is, to a position very close to the circumferential wall of the main body 2a of the outer cylinder 2 that is cooled by the outside air, and to be released. Improves cooling effect. Second, each discharge tube 18,
Since 18... is curved, the released exhaust gas becomes a swirling flow, and the sparks in the exhaust gas are subjected to centrifugal force and are easily collected on the peripheral wall side of the main body 2a of the outer cylinder 2. It also has an excellent cooling effect on exhaust gas. Third, similarly each discharge tube 1
8, 18... are curved, so the released exhaust gas hits the peripheral wall of the main body 2a of the outer cylinder 2 and returns to the discharge pipe 18 side, unlike if a straight pipe were used. There is no backflow, and the exhaust gas flows smoothly along the circumferential wall of the main body 2a of the outer cylinder 2, and from this aspect as well, the exhaust gas cooling effect is excellent. Now, the exhaust gas discharged from the gas discharge portion 17 in this manner flows along the peripheral wall of the main body 2a of the outer cylinder 2. In this process, the sparks contained in the exhaust gas are completely burned out or are cooled and extinguished by the peripheral wall of the outer cylinder 2, and most of the remaining particles are removed from the main body 2a.
is accumulated at the bottom of the The gas from which sparks have been removed is sequentially discharged to the outside from the outlet pipe 4.
Therefore, in this state, it functions as a spark discharge prevention device.

Therefore, by simply switching the butterfly valve 5, it can be used as a normal exhaust pipe or as a spark discharge prevention device.

"Effects of the Invention" As detailed above, the exhaust gas evacuation device for vehicles according to the present invention has a simple structure, is easy to install, is inexpensive, and does not require a particularly large space for installation. It can be installed in any vehicle because it does not require any fuel, and with a simple switching operation, it removes the sparks contained in the exhaust gas and exhausts only the gas, and has the same function as a normal exhaust pipe. It can also be used as an exhaust pipe with
The effects it has are significant, such as eliminating the problems that conventional exhaust gas evacuation devices have had in this type of vehicle.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the exhaust gas evacuation device for a vehicle according to the present invention, FIG. 2 is a longitudinal cross-sectional view of the main part of the gas discharge part, and FIG. 1 is a schematic configuration diagram showing a conventional example. 1...Exhaust gas discharge device, 2...Outer cylinder, 2a...
...Main body, 2b...End member, 2c...Mounting hole, 3...
...Inlet pipe, 3a... Rear end, 4... Outlet pipe, 5...
...butterfly valve, 6...operation mechanism, 17...gas discharge section, 17...discharge pipe.

Claims (1)

[Scope of claim for utility model registration] This device is installed in vehicles that enter and exit places where flammable hazardous materials are handled, such as airports and oil depots, as well as traveling on general roads. An exhaust gas discharging device for a vehicle that can also be used as an exhaust pipe for a vehicle, wherein an outlet pipe is attached to one end of the outer cylinder, and the rear end of the outer cylinder is inserted into the other end of the outer cylinder. An inlet pipe is installed, and the downstream end of the inlet pipe is closed when the vehicle enters an area where flammable hazardous materials are handled, that is, when this device also functions as a spark discharge prevention device, and when the vehicle When the device runs on a general road, etc., that is, when the device functions as a normal exhaust pipe, a switching valve configured to be open and operable outside the outer cylinder is provided, and together with this, the inlet is opened. A gas discharge section opening toward the circumferential wall of the outer cylinder is provided on the upstream side of the switching valve on the pipe, and the gas discharge section includes a plurality of gas discharge sections extending along the circumferential direction of the outer cylinder and curved in the same direction. Exhaust gas discharge in a vehicle, characterized in that a discharge pipe is provided in communication with the inlet pipe and protrudes, and each opening tip is positioned at a predetermined distance from the peripheral wall of the outer cylinder. Device.