JPS626247Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an exhaust gas purification device for a diesel engine.

(Prior Art and its Problems) As is well known, the gas discharged from a diesel engine contains aldehydes, which are partially discharged as unburned gas, and this generates a pungent odor.
Such a pungent odor is often generated when the engine is in a steady state, at low output, when idling, and when the engine is started.

One of the countermeasures is to close the exhaust valve installed in the exhaust pipe when the temperature of the exhaust gas falls below the set value during idling operation.
An exhaust gas purification device has been proposed that removes irritating odor components contained in the exhaust gas by heating a heater installed between the exhaust valve and the engine body (Utility Model Publication No. 52-25526). Public bulletin).

However, in such a device, the exhaust pipe is blocked by the exhaust valve during idling or low output, so engine output cannot be obtained, and the heater is expensive.

In addition, as another measure, the muffler installed in the diesel engine is composed of a normally used muffler and a muffler for removing irritating odors, these mufflers are installed side by side, and an exhaust valve is installed at the inlet of each muffler, respectively. Vehicle diesel engine exhaust that closes the exhaust valve of the normally used muffler and opens the purifying muffler exhaust valve during idling, and opens the normally used exhaust valve and closes the purifying muffler exhaust valve during normal driving. A gas purification device has been proposed (Jikko 52
-31872).

However, even with such a proposal, since the exhaust gas purification device consists of two pipes that discharge exhaust gas into the atmosphere, it would be difficult to apply such an exhaust gas purification device to a diesel engine, and it would be difficult to apply it to a diesel engine. Since the exhaust pipe will be changed to a wider one,
Undesirable.

In addition, in the past, in order to purify exhaust gas from diesel engines, water stored in a water tank was used to purify the exhaust gas of diesel engines.
A proposal has been made to purify black smoke by introducing the exhaust gas into an exhaust gas tank and guiding the exhaust gas into water in the exhaust gas tank (see Japanese Utility Model Application No. 51-309).

In such conventional examples, the exhaust gas is always introduced into the liquid regardless of the engine operating state, so as a purifying device that absorbs aldehydes in the exhaust gas,
This is undesirable because it creates back pressure and leads to unnecessary situations.

(Means for Solving Problems) Therefore, the present invention aims to completely eliminate the various disadvantages of these conventional techniques and provide an exhaust gas purification device suitable for diesel engines.

That is, the means of the present invention for solving the problems of the prior art is to install a piece in the middle of the exhaust pipe connected to the diesel engine that manually or automatically closes the exhaust pipe only when the engine output is low. An exhaust valve is provided, an inlet of a bypass with a smaller diameter than the exhaust pipe is provided on the upstream side of the exhaust valve, and an outlet is provided on the downstream side of the exhaust pipe, and a suspended tank is provided in the middle of the bypass. Exhaust gas from a diesel engine, characterized in that an aldehyde absorption liquid in the exhaust gas stored in the tank is brought into contact with the exhaust gas passing through the bypass only when the engine output is low. It is a purification device.

(Function) Since such a means is provided, the following function is achieved.
That is, the exhaust valve is opened during normal operation and closed during low output, either manually or automatically in conjunction with the easy position or regulator position of the fuel injection pump or the engine speed. Therefore, at low power, the exhaust gas passing through the exhaust pipe enters the bypass from the bypass inlet and comes into good contact with the absorption liquid. Therefore, formaldehyde, which accounts for most of the aldehydes in exhaust gas, dissolves in water and becomes formalin.
HC and unburned fuel are also absorbed. As a result, the purified exhaust gas returns to the exhaust pipe from the top of the tank and is discharged into the atmosphere. Also, during normal operation, the exhaust valve is opened and most of the exhaust gas is exhausted to the atmosphere without passing through the bypass. Then, the absorbent liquid that has been used for a certain period of time is replaced with a new absorbent liquid.

With such an effect, various problems of the prior art can be solved.

(Embodiments) The configuration of the present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings.
Three embodiments are shown, with identical parts being designated by the same reference numerals.

In the first embodiment shown in the first diagram, 1 is an exhaust pipe of a diesel engine, a bypass inlet 3 with a smaller diameter is opened in the exhaust pipe 1, and the other end of the bypass is provided adjacent to a tank 5. The upper part of the tank 5 is again communicated with the exhaust pipe 1 via another bypass. The tank 5 stores an absorption liquid (water) that absorbs aldehydes in the exhaust gas. Further, 2 is an exhaust valve provided in the exhaust pipe 1, and is provided close to the downstream side of the inlet 3. 6 indicates a lid, and 7 indicates a drain tank.

In this first embodiment, the exhaust valve 2 is moved manually to position A during normal operation and to position B during low output, or by adjusting the easy position or regulator position of the fuel injection pump or the engine speed. Automatically operate in conjunction. Therefore,
At low power, the exhaust gas passing through the exhaust pipe 1 enters the bypass through the bypass inlet 3 and comes into contact with the absorption liquid. Therefore, formaldehyde, which makes up most of the aldehydes in the exhaust gas, dissolves in water and becomes formalin, and HC and unburned fuel are also absorbed. As a result, the purified exhaust gas returns to the exhaust pipe 1 from the upper part of the tank 5. During normal operation, the exhaust valve 2 is set to the A position, and most of the exhaust gas is exhausted without passing through the bypass.

Then, the absorbent liquid that has been used for a certain period of time is discharged from the drain tank 7 and disposed of, and a new absorbent liquid is injected by opening the airtight lid 6.

In the second embodiment shown in the second diagram, the tank 5
The pump 8 also pumps up the absorbent liquid, which is then jetted out from the spout 9 and brought into contact with the exhaust gas. For the absorption liquid, a contact tank 11 is provided in the middle of the bypass 4, which is separate from the absorption liquid tank 5 and brings the exhaust gas into contact with the absorption liquid. The upper part of the contact tank 11 and the exhaust pipe 1 are communicated with each other.

FIG. 3 shows a third embodiment of the present invention, in which the bypass 4
A contact tank 11 between the exhaust gas and the absorbent is provided in addition to the absorbent tank 5 on the way, and the contact tank 11
The upper part communicates with the exhaust pipe 1.

In the embodiment shown in the fourth figure, a wire mesh 12 is provided in the contact tank 11 of the third embodiment, and the absorbent liquid is jetted downward from the spout 9 at the top of the contact tank 11.

In summary, the present invention has the following effects because it adopts the structure described in the claims for utility model registration.

(Effect of the invention) Exhaust gas at low output of the engine is passed through a small-diameter bypass attached to the exhaust pipe with a liquid absorbing aldehydes in the exhaust gas interposed, so that especially large amounts of exhaust gas at low output are passed through. It can absorb the aldehydes that are discharged, and even if back pressure is generated in the engine by passing it through a small diameter bypass and the output is reduced, there is no problem because the output is low. In other words, according to the present invention, when the engine output is high, the engine output is not affected at all, and since the amount of aldehydes emitted at high output is small, there is no need to absorb them, and the exhaust gas is generally rational. It can be a purification device.

Since a small diameter bypass is attached to the exhaust pipe and only the middle of the bypass is formed in a specific direction (vertically), the dead space around the engine can be used, and the exhaust gas purification device can be made small and compact. Moreover, since the conventional exhaust pipe does not need to be particularly modified, it is possible to provide an inexpensive and convenient exhaust gas purification device.

Since only the exhaust gas passing through the small-diameter bypass is simply brought into contact with the aldehyde absorbing liquid, a small amount of the liquid is required, and the period for exchanging the liquid can be extended.

[Brief explanation of the drawing]

1 shows a first embodiment of the present invention, FIG. 2 shows a second embodiment, FIG. 3 shows a third embodiment, and FIG. 4 shows a fourth embodiment. 1...Exhaust pipe, 4...Bypass, 5...Storage tank.

Claims (1)

[Scope of utility model registration request] In the middle of the exhaust pipe connected to the diesel engine, there is an exhaust valve that closes the exhaust pipe manually or automatically only when the engine output is low. An inlet of a small-diameter bypass is provided with an outlet provided on the downstream side, and a suspended tank is provided in the middle of the bypass,
An absorbing liquid that absorbs aldehydes in the exhaust gas is stored in the tank, and the absorbing liquid is brought into contact with as much exhaust gas as possible that passes through the bypass only when the engine output is low. An exhaust gas purification device for diesel engines featuring: