JPH11280450A - On-off valve with orifice and exhaust gas purification device using it - Google Patents

Abstract

(57) [Summary] [Problem] To arrange a plurality of trappers in parallel and to cover reproduction by another trapper even if a specific trapper fails,
In order to circulate and compensate for the entire exhaust gas purification device not to malfunction, we propose an on-off valve that accurately performs a shut-off function in a part that is not exposed to high-temperature corrosive gas. A path opening / closing valve (4) used for regenerating an exhaust gas purifying apparatus, the turning fulcrum shaft (5) holding the opening / closing valve (4).
A boss arm 6 swingably disposed on the pivot 5, a head spindle 8 inserted into a play hole 7 provided in a part of the boss arm 6, and the head spindle 8. A valve body 9 provided with a fitting orifice 11 is fixed to the spindle 8 with a head, and a valve seat 10 having a flat surface that comes into surface contact with the valve body 9 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-off valve with an orifice for removing harmful fine particles in exhaust gas generated from an engine used for a vehicle or industrial use, and an exhaust gas purifying apparatus using the same.

[0002]

2. Description of the Related Art Diesel engine exhaust gas contains
Contains various harmful components that cause air pollution. One of the components is flammable fine particles mainly composed of carbon, which are called particulate matter (hereinafter referred to as PM). In order to remove this PM, it is of course to suppress the generation of PM by improving the engine, but it is more reliable to install a trapper in the exhaust pipe and trap the PM with the trapper. It has been put to practical use as a means.

[0003] In this apparatus, it is necessary to regenerate the trapper by periodically burning the collected PM, and it is difficult to regenerate the trapper in an atmosphere in which exhaust gas flows. It is preferable to install a trapper in each branch path and perform collection and regeneration alternately. In this apparatus, a path switching valve that shuts off the branch on the regeneration side and guides the exhaust gas to the branch on the side that collects PM is required.
However, since high-temperature corrosive gas is contained in the exhaust gas of the engine and lubricants such as lubricating oil cannot be used, well-known on-off valves and switching valves are not suitable.

Japanese Patent Application Laid-Open No. 56-92318 proposes an exhaust gas purifying apparatus in which a flap valve having a rotation fulcrum is provided at the center of two branch paths to alternately select a collection and regeneration branch path. Have been. FIG. 5 shows a partial cross-sectional view of the exhaust gas purification device 100. The exhaust gas flows in from the arrow A, is collected by the right and left trappers 101a, 101b, is heated and ignited by the heaters 102a, 102b, burns, and is discharged from the arrow B.

The flap valve 103 swings right and left about a pivot shaft 104, and the exhaust gas is shut off at this portion by matching the inner shape of the trapper case 105 and the outer shape of the flap valve 103. Also, the flap valve 103 is provided with an orifice 106 to take in oxygen in the exhaust gas,
Assists combustion during regeneration.

In this prior art, the orifice 106 through which the exhaust gas passes is provided in the flap valve 103 by configuring as shown in FIG.
1b, it is possible to achieve optimal combustion within the heater 102b.
It is described that the power consumption of the a and 102b can be reduced and the trapped fine particles can be effectively burned and removed.

[0007]

The on-off valve and the switching valve in the exhaust gas purifying apparatus are exposed to high-temperature corrosive gas exhausted by the engine. Therefore, the movable part is easily corroded, and in the structure proposed in Japanese Patent Application Laid-Open No. 56-92318, not only is the exhaust gas cut-off part in line contact, but also the flap valve is easily corroded, so that its outer shape must be accurately determined. It is difficult to maintain and accurately maintain the shut-off function. The shape of the valve seat is preferably a simple planar butting structure.

Further, in consideration of the disconnection of the heater and the clogging of the trapper itself, it is preferable that the number of the trappers is two, and the number of trappers is large, and the trapper in failure is compensated for. Nor. The present invention provides a means for controlling the movement of the exhaust gas of a large number of trappers by an on-off valve having a simple valve seat installed in an atmosphere in which PM is relatively low.

[0009]

A pivot shaft for holding an on-off valve, a boss arm arranged to be swingable by the pivot shaft, and a play hole provided in a part of the boss arm. By providing a headed spindle to be inserted, a valve body provided with an orifice supported by the bossed arm by the headed spindle, and a flat valve seat in surface contact with the valve body, the movement of exhaust gas is reduced. Stop and supply oxygen required for PM combustion.

The contact surface of the valve body with the bossed arm is configured to be in contact with a spherical surface, so that the degree of freedom of the valve body close to the valve seat is improved.

The headed spindle and the valve body are fixed to each other via a sleeve so that the play of the headed spindle with respect to the valve seat is maintained, and the degree of freedom of close contact of the valve body with orifice to the valve seat is improved. Improve.

A plurality of traps for collecting and periodically removing harmful fine particles in exhaust gas are arranged in parallel, so that even if a specific trapper fails, regeneration can be covered by another trapper. An on-off valve with an orifice is arranged upstream or downstream of each trapper to control the movement of the exhaust gas so that the entire purification device is circulated and compensated so as not to malfunction.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An on-off valve with an orifice and an exhaust gas purifying apparatus using the same according to the present invention will be described below in detail with reference to the drawings. 1 and 2 show an embodiment of an on-off valve with an orifice according to the present invention. FIG. 3 shows an example of an outline of an exhaust gas purifying apparatus using the same.

FIG. 1 is a sectional view of an on-off valve unit 1 according to a first embodiment of the present invention. The exhaust gas flows from the trapper exhaust pipe 21 extending from the trapper case into the on-off valve case 2 as shown by arrow A, and flows out in the direction of arrow B of the downstream branch pipe 3. The on-off valve 4 of the present invention is arranged in the middle of this exhaust gas flow path.

Numeral 5 is a rotation fulcrum shaft, and an arm 6 with a boss is provided.
Is fixed with a key or a cotter pin. A play hole 7 is provided in the flat plate-shaped arm 6 with a boss, a headed spindle 8 is inserted, and a valve body 9 is held. The contact surface of the valve element 9 with the bossed arm 6 is spherical, the seat surface 9a has a smooth flat surface, and the outer shape is rectangular even if it is larger than the inner diameter of the valve seat 10. Is also good. Valve 9
A through hole 9b is provided in the center of the head spindle 8 so as to fit with the outer diameter of the headed spindle 8, and an orifice 11 is provided inside the inner diameter of the valve seat 10 to allow the passage of exhaust gas. A screw or split pin hole is provided at the tip of the headed spindle 8, and the valve element 9 is held by a nut or washer 12.

The on-off valve 4 configured in this manner controls the trapping and regeneration of PM in the trapper and the circulation and failure detection.
It swings as indicated by arrow C by a signal from a separately provided control unit. The rotation fulcrum shaft 5 is contacted with a valve body 9 against a valve seat 10 by an actuator (not shown) such as a step motor or an air cylinder which receives the signal, to cut off the path as shown by a dotted line, Open as shown. When the seat surface 9a is a flat surface as shown in FIG. 1, if the center of the rotation fulcrum shaft 5 and the contact surface of the valve seat 10 are not parallel in mechanism, the shut-off function is reduced. In the first embodiment, the contact surface of the valve body 9 with the bossed arm 6 is formed to be spherical, and the gap S between the headed spindle 8 and the bossed arm 6, A clearance is formed between the diameter of the neck below the head of the headed spindle 8 and the play hole 7 of the arm 6 with the boss, and the seat surface 9a of the valve body 9 is automatically moved along the valve seat 10 to cut off the exhaust gas path. .

In FIG. 1, when the on-off valve is shut off as indicated by the dotted line, the PM trapped when passing through the upstream trapper stops the convection of the exhaust gas.
M is no longer trapped and is ready for regeneration. The PM adhering to the trapper is ignited by the heating of the heater and burns. However, since oxygen is required for combustion, oxygen is forcibly supplied by a blower or the like, or from the orifice 11 provided in the valve body 9. It is effective to eject some exhaust gas and utilize oxygen in the exhaust gas.

FIG. 2 shows the on-off valve unit 15 of the second embodiment.
FIG. The function and operation of the on-off valve 16 are the same as in the first embodiment. In the second embodiment, the headed spindle 8
The valve element 9 is held via the sleeve 17 in order to easily manage the gap S between the arm and the bossed arm 6. If fixing of the headed spindle 8 is a screwing means using a nut 12, it is necessary to stop the nut 12 at a position where a gap S is left in the middle of the screw in the case of the first embodiment. In this case, the gap S can be automatically secured by closing the sleeve 17.

FIG. 3 shows an example of an arrangement diagram of the on-off valve units 1 and 15 in the exhaust gas purifying apparatus. The exhaust gas of the engine is distributed to each trapper unit 20 via the upstream branch pipe 18 as shown by an arrow D, and is condensed by the downstream branch pipe 3 from the on-off valve units 1 and 15 arranged downstream thereof, as indicated by an arrow E. Is discharged in the direction of. In FIG. 3, the on-off valve units 1 and 15 are arranged on the downstream side of the trapper unit 20, but the same function can be obtained by arranging them on the upstream side. The structure inside the trapper unit 20 is shown in FIG.

As shown in FIG. 3, the trapper unit 20
Are arranged in parallel, if any one of the trapper units 20 (supposed to be A) is burning PM to be regenerating, the other trapper unit 20
(B, C, D) is the concentration of PM. Therefore, the trapper unit 2 is controlled by a signal from a separately provided control unit.
On-off valve units 1 and 15 attached to 0 (A) are closed,
The on-off valve units 1 and 15 attached to the other trapper units 20 open to purify exhaust gas while circulating collection and regeneration.

Further, any of the trapper units 20
If a failure occurs, the closing of the on-off valve units 1 and 15 attached to it can be continued to prevent the trapper from being clogged by excessive PM collection and increasing the back pressure of the engine. In any case, if the on-off valves 4 and 16 used in such a system are provided downstream of the trapper, the surrounding area is relatively low in PM, so that corrosion and operation due to the adhesion of PM to the movable parts will occur. If the trapper carries an oxidation catalyst, it is effective to provide it upstream to prevent the on-off valves 4 and 16 from being exposed to oxidizing exhaust gas.

Since the on-off valve units 1 and 15 and the trapper unit 20 have the same compatible specifications, if a specific unit fails, it can be repaired by removing the flange bolt 19, and the repair part can be repaired. And supply management for each unit is easy.

FIG. 4 is a sectional view of a trapper unit 20 suitable for the exhaust gas purifying apparatus of the present invention. Inside the substantially cylindrical trapper case 22, a trapper case 2 is provided.
Eyelets 23a, 23 welded and fixed along the inner diameter of
A multi-cylinder trapper 25 made of a metal foam and held at both ends by a fixing plate 24 and a fixing plate 24 is housed therein. In the annular gap 26 of the trapper 25, a thin cylindrical heater 28 protected by an insulator 27 so as not to contact the trapper 25 is disposed using an external battery 29 as a power source.

The exhaust gas introduced from the upstream branch pipe 18 is guided by the eye plate 23 in the direction shown by the arrow F to reach the annular gap 26, and the outlet is blocked by the stop plate 23b. When passing through the metal foaming gap of the trapper 25, the exhaust gas in which PM is collected and purified flows in the direction of arrow G, and reaches the on-off valve units 1 and 15. Captured P
After a given accumulated engine operation time has elapsed, the valve M closes the on-off valve units 1 and 15 to restrict the flow of exhaust gas, and the heater 28 ignites and burns PM to regenerate the trapper 25. Harmful components in the exhaust gas are removed by alternately repeating the trapping and regeneration of the PM in the trapper units 20 arranged in parallel.

[0025]

According to the present invention, an on-off valve for controlling the movement of exhaust gas from a large number of trappers is disposed upstream or downstream of the trapper. Since the contact surface of the body with the arm with the boss is in contact with the spherical surface, the degree of freedom of close contact with the valve seat is improved, and the movement of the exhaust gas can be cut off with high accuracy.

An orifice is provided in a part of the valve body to
Since oxygen necessary for combustion is supplied, effective trapper regeneration can be achieved. Then, by arranging a plurality of traps in parallel, even if a specific trapper fails, the other trappers cover the regeneration and circulate to compensate, so that the entire exhaust gas purification device does not malfunction. Can be

[Brief description of the drawings]

FIG. 1 is a sectional view of an on-off valve unit according to a first embodiment of the present invention.

FIG. 2 is a sectional view of an on-off valve unit according to a second embodiment of the present invention.

FIG. 3 is a layout view of an on-off valve unit in the exhaust gas purifying apparatus of the present invention.

FIG. 4 is a sectional view of a trapper unit of the exhaust gas purifying apparatus of the present invention.

FIG. 5 is a partial sectional view of a conventional exhaust gas purifying apparatus.

[Explanation of symbols]

 1, 15: On-off valve unit 2: On-off valve case 3: Downstream branch pipe 4, 16: On-off valve 5: Rotating fulcrum shaft 6: Arm with boss 7: Play hole 8: Spindle with head 9: Valve body 10: Valve Seat 11: Orifice 12: Nut or washer 17: Sleeve 18: Upstream branch pipe 19: Flange bolt 20: Trapper unit 21: Trapper exhaust pipe 22: Trapper case 23a, b: Eye plate 24: Fixing plate 25: Trapper 26 : Annular gap 27: Insulator 28: Heater 29: Battery

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI F02D 9/04 ZAB F02D 9/04 ZABE 9/10 9/10 A (72) Inventor Shuhide Sakaguchi Kuniichi Kitaichi, Itami-shi, Hyogo Sumitomo Electric Industries Co., Ltd. Itami Works (72) Inventor Shiro Nakajima 1-1-1, Koyokita Kita, Itami City, Hyogo Prefecture Sumitomo Electric Industries Co., Ltd. Itami Works

Claims (4)

[Claims] 1. A path opening / closing valve used for regenerating an exhaust gas purifying apparatus, comprising: a pivot shaft for holding the on-off valve; a boss arm slidably arranged by the pivot shaft; A head spindle inserted into a play hole provided in a part of the boss arm, a valve body provided with an orifice supported by the boss arm by the head spindle, and a flat valve in surface contact with the valve body An on-off valve with an orifice, characterized by comprising a seat. 2. The on-off valve with an orifice according to claim 1, wherein a contact surface of the valve body with the boss arm is in contact with a spherical surface. 3. The fixing device according to claim 1, wherein the headed spindle and the valve body are fixed via a sleeve.
Or an on-off valve with an orifice according to any of 2. 4. An exhaust gas treatment device provided in the middle of an exhaust pipe of an engine, comprising: a plurality of traps arranged in parallel for collecting and periodically removing harmful fine particles in exhaust gas; An exhaust gas purifying apparatus comprising the on-off valve with an orifice according to any one of claims 1 to 3, which is disposed on each upstream or downstream side.