JPH10246129A - Alternate valve assembly for smoke and soot recombustion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve assembly for a smoke and soot recombustion device whereby complete air-tightness in the high temperature atmosphere is held, carbon or the like can not be infiltrated in a space of a bearing part of a gate valve. SOLUTION: A pair of valves are provided, which are provided symmetrically in each inlet of a filter connected to each branch of an exhaust manifold branching into two parts to be mutually alternately opened/closed. Each valve is supported to a bearing part 46, 48 of a valve housing 2, provided with an inlet and outlet, by a shaft 24 provided with a central quadrangle shaft 26 and protruded end part 36. Each shaft includes a valve body supported through a bushing 44, 56, arm 22 connecting the valve body and the shaft, actuator alternately opening/closing the valve body via the arm through a link, collar 50 sealing so as to prevent exposure of the periphery of the shaft, air-tightness holding ring unit 42, 54 energized by a spring, a pair of retainer ring units 66, packing material 68, ring-shaped valve seat, and a cushion material ensuring air-tightness of this seat.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alternating valve assembly in which a pair of valves are arranged symmetrically and opened and closed alternately. More specifically, the invention uses light oil or heavy oil as fuel. The present invention relates to an alternate valve assembly for a soot reburning device applicable to an engine.

[0002]

2. Description of the Related Art It is known that light oil or heavy oil has a higher ignition point than a flash point and does not completely burn, thereby generating a large amount of soot. Such a problem of soot generation is particularly noticeable in diesel engines, and its exhaust gas is characterized by particulate soot containing carbon monoxide, unburned hydrocarbons, carbon, etc. . When the particulate soot is released into the atmosphere, it causes smog pollution, and thus, efforts have been made to remove it. As an example of a method for removing soot generated from a diesel engine, a reburning method and an oxidation promoting method using a catalyst are known. The former method uses a muffler connected to the engine's exhaust manifold to re-burn the soot components collected from the exhaust gas by a burner, and the latter promotes the oxidation of the soot components contained in the exhaust gas by the catalyst. Is a method of oxidation. Although the former method is partially used, it burns with a separate burner attached to the muffler, so it consumes heavy fuel and controls the timing of reburning if the vehicle does not adhere to the fixed load. However, it has difficulties, so it is not widely applied. Also,
The latter method has a merit that the use of a catalyst does not cause an increase in fuel consumption and is easy to control, but has a disadvantage that the efficiency of soot removal is low.

[0003] On the other hand, an apparatus has been developed which burns the filtered soot component by electric heat by taking a step forward from the former method.
In this method, the end of the exhaust manifold is branched into two parts, filters with electric heaters are attached to each end and linked, and valves constituting an alternate valve assembly are installed at the inlet of each filter. The exhaust gas discharged through the exhaust manifold is alternately opened and closed so that the soot component in the exhaust gas is alternately filtered and recombusted.

[0004]

A modified butterfly valve or gate valve is applied to the above-described valve assembly of the soot reburning apparatus. However, since the exhaust manifold is placed in a high-temperature atmosphere of at least 200 ° C. or more, the above-mentioned valve does not satisfy the special conditions that must withstand a high-temperature environment while maintaining airtightness, and has a short life. . To elaborate,
Since the seal member for preventing leakage of the valve is made of rubber or a silicon-based compound and cannot maintain its original form in an atmosphere of 200 ° C. or more, a leakage phenomenon occurs within a while, Therefore, it is not easy to alternately open and close the butterfly valve or the gate valve and control the combustion timing. In addition, there is another problem that carbon or the like penetrates and is fixed in a gap between a shaft that rotatably supports the butterfly valve or the gate valve and the bearing, so that the valve cannot be operated.

[0005]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in order to overcome the various problems found in a soot reburner having a pair of modified butterfly or gate valves as described above. And airtight,
It is another object of the present invention to provide an alternate valve assembly for a soot reburning device in which carbon or the like cannot penetrate into the gap of a bearing portion of a butterfly valve or a gate valve.

In order to achieve the object of the present invention, a filter is connected symmetrically to each branch of a bifurcated exhaust manifold, and is opened and closed alternately. An alternating valve assembly for an engine soot reburner comprising a pair of alternating valves, wherein each of said valves is substantially squarely formed in a bearing portion of a valve housing having an inlet and an outlet. A valve body rotatably supported by a shaft having a protruding end portion extended from the bushing and supported by a bearing portion of the valve housing and supporting bushings respectively supporting the shaft and the protruding end portion; An arm connecting the body and the shaft, and an arm disposed outside of the valve housing, connected to the protruding end via a link, and connected to the valve through the arm. An actuator for opening and closing alternately, a collar periphery of the inner to the axis of the inserted valve housing to the outer periphery of the shaft is shielded so as not to be exposed,
An airtight retaining ring inserted into the outer periphery of the shaft and the protruding end and biased by a spring and arranged to always contact the inner end of the bushing; and a bearing of a valve housing supporting the protruding end of the shaft A pair of retainer ring bodies inserted inside the part, a packing material interposed between the retainer ring bodies to seal a gap between the protruding end and the collar, and an inner peripheral surface of an inlet of the valve housing. The present invention provides an alternate valve assembly for a soot reburning device, comprising: a ring-shaped valve seat inserted into a jaw of an annular groove formed in the valve seat; and a cushion material provided outside the valve seat to ensure airtightness.

In the alternate assembly for a soot reburning apparatus according to the present invention, the bearing may be formed in a polygonal shape in order to integrally support the arm connected to the valve body.

Further, a jam plate may be added to a protruding end of the shaft connected by the link of the actuator in order to prevent a fastening nut for fixing the link from loosening.

In the alternate valve assembly for a soot reburning device according to the present invention, the valve body has a pin bearing portion and a fixing bolt formed on one side thereof, and the pin bearing portion has a pin formed on the arm. Both ends of the connecting pin penetrating the hole are supported, and the fixing bolt is inserted through a through hole formed at the end of the arm through a washer with a hemispherical groove and a washer having a hemispherical projection, and a nut is used. Can be fastened. A jam plate may be added to the end of the fixing bolt to prevent the nut for attaching the arm from loosening.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a structural view of a main part of a valve of an alternating valve assembly including a pair of valves according to the present invention. The valve housing (2) has an inlet (6) communicating with the exhaust manifold (4) and an outlet (8) opened on the opposite side. The inlet (6) of the valve housing is opened and closed by a valve body (10), and the inlet (6) is closed so that the valve body (10) is airtightly closed.
Is machined with an annular groove (14) having a jaw (12), and a ring-shaped valve seat (16) is housed inside the annular groove (14). The valve body (10) and the ring-shaped valve seat (16) are actually made of stainless steel, and their contact surfaces are wrapped so as to form a mirror surface.

Since the ring-shaped valve seat (16) is urged by a cushion material (18) disposed outside the ring-shaped valve seat (16), the valve body (10) can be thermally deformed.
And a close contact state can be maintained.
The cushion member (18) also has a function of sealing leakage of exhaust gas through the periphery of the ring-shaped valve seat (16).

The valve body (10) is connected to an arm (22) through a pin bearing (20) formed on the back side thereof, and the arm (22) is formed at a substantially intermediate portion of a shaft (24) described later. The valve body (10) is opened and closed from a solid line position in the drawing to a dashed line position in conjunction with an actuator (28) disposed outside by being attached to the square shaft (26). Actuator (28)
Can be selectively adopted from a fluid cylinder or a reversible motor.

FIG. 2 is an exploded perspective view showing the assembly structure of the valve illustrated in FIG. Disc-shaped valve body (1
0) is connected to the arm (22) by at least a pair of pins (30) penetrating a pin bearing portion (20) formed on the back surface thereof, so that the arm (22) is connected to a pair of pin holes (32). ) (34). More specifically, the upper pin hole (3) of the arm (22) is used.
2) is formed so as to have a large tolerance differently from the pin hole (34) on the lower side, and accordingly the valve body (10) has a ring-shaped valve seat (16) on all surfaces when closed. And maintain a close contact relationship with them. That is, since the lower pin hole (34) of the arm (22) is located at the center of the valve body (10), the pin (30) passing through the upper pin hole (32) when in the closed position is lower. The position is slightly shifted from the pin (30) penetrating the pin hole (34). This gives the upper pin hole (32) a considerable tolerance, and thus the upper pin hole (3).
The pin (30) passing through 2) can be loosened somewhat. According to such a configuration, the entire outer peripheral surface of the valve body (10) is evenly adhered to the ring-shaped valve seat (16). An arm (22) for tightly closing the valve body (10) to a ring-shaped valve seat (16) is inserted into a square shaft (26) of a shaft (24). The shaft (2
The protruding end (36) of (4) is formed to extend from the square axis (26).

FIG. 3 is a sectional view showing the bearing structure of the valve housing (2), which is drawn along the line AA in FIG. The terminal end of the protruding end (36) is arranged so as to be exposed outside the valve housing (2), and its periphery is covered with a cover (38). On the other hand, the protruding end (36)
A spring (40), a pair of airtight holding ring bodies (42), and a bushing (44) are sequentially inserted around the outer periphery of.
The shaft (24) and the protruding end (36) are supported by bearings (46) (48) provided inside the valve housing (2). The shaft (24) has a collar (5
0) is added and the protruding end (3
As in 6), a spring (52), a pair of airtight retaining ring bodies (54) and a bushing (56) are provided. The two springs (40) and (52) urge the corresponding airtight ring bodies (42) and (54) to form a gap between the protruding end (36) and the bushing (44) and the shaft (24). The gap formed between the collar (50) and the bushing (56) is closed, and acts to maintain airtightness.

On the other hand, a passive member (60) connected to the active member (58) of the actuator (28) is fastened to the terminal end of the protruding end (36) via a nut (62). A loosening prevention jam plate (64) may be attached to the nut (62). The jam plate (64) is actually a metal plate bent in a U-shaped side surface, and has a structure in which a hexagonal hole for holding the nut (62) is formed on one side surface. The jam plate (64) is non-rotatably inserted into the protruding end (36). Therefore, a bolt portion into which the nut (62) is screwed is cut into an outer peripheral symmetric surface to have an elliptical cross section. It is preferable that the corresponding portion of the jam plate (64) inserted therein also has an elliptical hole corresponding to the elliptical cross section.

A pair of retainer ring bodies (66) and a packing material (68) located between the retainer ring bodies (66) to be protected are inserted outside the protruding ends (36). 46). The retainer ring (66) has its inner diameter set to be larger than the outer diameter of the protruding end (36) and is loosely arranged, while the packing material (68) therebetween is tightly fitted to the protruding end (36) and integrated therewith. Is rotated. Therefore, as described above, when the packing material (68) rotates together with the protruding end portion (36), the retaining ring bodies (66) on both sides of the packing material (68) are attached to the packing material (6).
The passage is opened so that the rotation of 8) is performed smoothly, whereby leakage through the outer peripheral surface of the protruding end (36) is completely prevented.

On the other hand, the shaft (2) is connected to the valve housing (2).
The outer end of the bearing (48) supporting 4) is attached with a cover plate (70). The cover plate (70)
A slip washer (72) and a packing material (74) are interposed at the end of the shaft (24) finished by (1) so that leakage through the portion is completely prevented.

The valve having the above-described structure is used by symmetrically arranging it in the exhaust manifold (4) which is branched into two as shown in FIG. 4, and the one-side valve housing (2) is opened. When in operation, the opposite valve housing (2) is controlled to be closed so that they alternately open and close. The two valve housings (2) each have a filter (76) communicated with the outlet side thereof. The filter (76) has a built-in electric heater in the conventional manner, and is connected to a normal muffler via a muffler tube (78). Exhaust gas discharged through the exhaust manifold (4) passes through the open valve housing (2) to the filter (7).
6), where particulate soot components such as carbon are filtered. The filter (76) is formed of bucket-shaped porous ceramics, and soot particles to be filtered are collected inside the filter (76). As the amount of collected soot particles increases, the pressure inside the filter (76) increases, which is sensed by a pressure sensor or the like (not shown) and released when the measured pressure reaches a set pressure value. The closed valve housing (2) is controlled to be closed, and the closed valve housing (2) is controlled to be opened. Accordingly, the exhaust gas enters the valve housing (2) switched from closed to open, and at the same time, the filter (76) of the valve housing (2) switched from open to closed immediately closes the internal electric heater. Operates to reburn the collected soot components. As described above, while the filter (76) on one side collects the soot particles, the filter (76) on the other side repeats a series of operations for reburning the collected soot particles, thereby passing through the exhaust manifold (4). The exhaust soot particles are completely removed.

FIG. 4 shows an example in which two valves constituting an alternate valve assembly for a soot reburning apparatus according to the present invention are arranged in parallel. However, the present invention is not limited to this example. When a T-shaped pipe is interposed in the exhaust manifold (4) as shown in FIG. 5, the inlet and the outlet of each valve housing (2) may be modified into a structure in which the inlet and the outlet are arranged orthogonal to each other.

FIG. 6 illustrates another embodiment of the alternate valve assembly for a soot reburner according to the present invention which relates to the assembly of the valve. The valve body (10) further includes a fixing bolt (80) on the back surface thereof in addition to the pin bearing part (20), and an arm (2) supporting the valve body (10).
2) A through hole (8) through which the fixing bolt (80) penetrates.
2) is formed. When the arm (22) is fastened with the fixing bolt (80) of the valve body (10), it is connected via a washer (84) with a hemispherical groove and a washer (86) having a hemispherical projection. You. The said hemispherical grooved washer (84) can support the washer (86) provided with the corresponding hemispherical projection by a ball joint, so that the valve body (10) is a ring-shaped valve seat (16). Contact in close and uniform condition. For this purpose, the valve body (10) is
The pin hole (88) of the arm (22) supported by the pin bearing portion (20) is preferably assembled with a suitable tolerance for the pin (30). The fixing bolt (8
In (0), a fixing nut (92) is screwed through a spring washer (90) so that the arm (22) is integrally fastened to a fixing bolt (80) of the valve body (10). However, if necessary, it is also possible to prevent the loosening of the fixing nut (92) by juxtaposing the above-mentioned jam plate (64).

The unexplained reference numeral 94 in FIG. 2 designates a vent, which supplies air required for soot reburning, and is not required in a vehicle provided with an air compressor.

[0022]

As described above, the present invention relates to an alternate valve assembly which is reversibly turned by an actuator (28) to open and close a pair of valve bodies (10), and is provided inside a valve housing (2). Since both ends of the shaft (24) for interlocking the 10) are supported by the collar (50) and the bushings (44) (56), the valve body (10) can be smoothly opened and closed. Also, the projecting end (36) of the shaft (24) and the bushing (44)
And the gap between the collar (50) and the bushing (56) are sealed by an airtight retaining ring body (42) (54) urged by a spring (40) (52) and the shaft (24). The bearing portion (46) of the valve housing (2) supporting the protruding end (36) of the valve housing (2) is sealed by a pair of retainer ring bodies (66) with a packing material (68) interposed therebetween, so that the valve housing (2) is closed. Since the internal airtightness of (1) is maintained, the open / close control of the filter (76) performed by detecting the internal pressure of the smoke reburning device can be perfectly performed. In addition, since carbon or the like does not penetrate in the gap between the shaft (24) that rotatably supports the valve body (10) and the bearing portions (46) and (48), the valve body (10) is always in the highest operating state. become.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an example of the device of the present invention.

FIG. 2 is an exploded perspective view showing the structure of each part of the valve illustrated in FIG.

FIG. 3 is a sectional view showing a bearing structure according to the line AA in FIG. 1;

FIG. 4 is a diagram illustrating the use of the present invention.

FIG. 5 is a diagram illustrating a modified use of the present invention.

FIG. 6 is an exploded perspective view showing another embodiment of the valve structure illustrated in FIG. 2;

[Explanation of symbols]

 2: Valve housing 4: Exhaust manifold 10: Valve body 16: Ring-shaped valve seat 18: Cushion material 20: Pin bearing 22: Arm 24: Shaft 26: Square shaft 28: Actuator 36: Projecting end 40, 52: Spring 42, 54: Airtight holding ring 44, 56: Bushing 46, 48: Bearing 50: Collar 64: Jam plate 66: Retaining ring 68: Packing material 76: Filter 78: Muffler tube 80: Fixing bolt 82: Through Hole 84: hemispherical grooved washer 88: washer with hemispherical projection

──────────────────────────────────────────────────続 き Continued on front page (51) Int.Cl. ⁶ Identification code FI F16K 31/44 F16K 31/44 C

Claims (4)

[Claims] An engine including a pair of alternating valves symmetrically provided at each inlet of a filter connected to each branch of a bifurcated exhaust manifold and opened and closed alternately. In the alternating valve assembly for a soot reburning device, each of the valves includes a substantially centrally formed square portion and a protruding end portion extended from a bearing portion of a valve housing having an inlet and an outlet. A valve body rotatably supported by a bushing supported by a bearing portion of the valve housing, the bushing supporting the shaft and the protruding end; and an arm connecting the valve body and the shaft. An actuator disposed outside the valve housing and connected to the protruding end through a link to alternately open and close the valve body through the arm; A collar inserted into the outer periphery of the shaft to shield the outer periphery of the shaft from being exposed inside the valve housing; and a collar inserted into the outer periphery of the shaft and the protruding end to be biased by a spring and to the inner end of the bushing. A pair of retainer ring bodies inserted and arranged inside a bearing part of a valve housing that supports a protruding end of the shaft; and a pair of retainer ring bodies interposed between the retainer ring bodies. A packing material inserted to seal a gap between the protruding end and the collar; a ring-shaped valve seat inserted into a jaw of an annular groove formed in an inner peripheral surface of an inlet of the valve housing; An alternate valve assembly for a soot reburning device, comprising a cushion material provided outside a seat to ensure airtightness. 2. The alternate valve assembly according to claim 1, wherein a portion of the bearing portion that supports an arm connected to the valve body is formed in a polygonal shape. 3. The alternate valve according to claim 1, wherein the link is connected to a protruding end of the shaft via a jam plate that prevents a fastening nut from loosening. Assembly. 4. The valve body has a pin bearing portion and a fixing bolt formed on one side thereof, and both ends of a connecting pin passing through a pin hole formed in the arm are provided on the pin bearing portion. The fixing bolt is supported and penetrated through a through hole formed at the end of the arm through a washer having a hemispherical groove and a washer having a hemispherical protrusion, and is fixedly fixed with a nut. 2. The alternating valve assembly for a smoke reburning device according to claim 1.