JPH089381Y2 - Switching valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an internal combustion engine in which the supply of fuel to some cylinders of a multi-cylinder internal combustion engine is stopped and the fuel is used as an air compressor. The present invention relates to improvement of an exhaust passage switching valve device provided in an exhaust pipe of some cylinders.

[Prior Art] In recent years, fuel supply to some cylinders of a multi-cylinder internal combustion engine mounted on a vehicle is stopped, exhaust pipes of these cylinders are closed using shutoff valves, and the upstream side of these shutoff valves is closed. An exhaust passage switching valve device is provided in the exhaust passage of and the compressed air obtained in the fuel supply stopped cylinder is taken out through the exhaust passage switching valve device, so that this internal combustion engine can be used as an air compressor. It is well known that there are multi-cylinder internal combustion engines.

As a conventional multi-cylinder internal combustion engine in which a part of the cylinders is operated as an air compressor, a device disclosed in Japanese Utility Model Laid-Open No. 59-4878 is known. This prior art is a device relating to an improvement for preventing high-pressure air from leaking from the piston portion in the exhaust passage switching valve device.

FIG. 3 is a diagram shown in the above-mentioned prior art, and illustrates a configuration in the case where powder particles to be loaded are pressure-fed by the compressed air obtained by the means. That is, it is an explanatory diagram in which the exhaust passage switching valve device 2 is attached to a V-type 8-cylinder internal combustion engine 1 capable of using 4 cylinders out of 8 cylinders as an air compressor. That, C ₁ of the internal combustion engine _{1, C 3, C 5,} C 7 cylinder has a fuel supply stoppable cylinders, an exhaust brake in the middle of the exhaust pipe 3A of these cylinders has the function of pipe cut-off
4A is provided. And the other cylinder row C ₂ , C ₄ ,
In the middle of the exhaust pipe 3B of C _6, C ₈ provided an exhaust brake 4B, these exhaust pipes 4A, the exhaust gas G through 4B is pumped to the outside through a silencer 5.

The exhaust passage switching valve device 2 is attached to the upstream side of the exhaust brake 4A so that the exhaust pipe 3A communicates with the compressed air extraction pipe 6.

In the figure, 7 is an air filter, 8 is powder cement, sugar,
In a granular material tank that stores a load composed of granular material such as wheat flour, the contents are carried out by sending compressed air from the compressed air take-out pipe 6 to the outside through a duct 9.

The structure of the exhaust passage switching valve device 2 will be described with reference to FIG. FIG. 4 is an enlarged sectional view of an essential part showing the details of the exhaust passage switching valve device 2 described above.
Is composed of an assembly of a main body casing 11 forming a part of the piston device 10 and the compressed air extracting pipe 6, and the casing 11
Is an opening 12 that branches the compressed air extraction pipe 6 from the exhaust pipe 3A.
Installed on. The valve 13 operated by the piston device 10 is provided so as to open and close the opening 12. The valve rod 14 is reciprocally moved by a return spring 15 and high-pressure air supplied from a conduit 16.
Driven by the valve umbrella 18 abutting against the valve seat 19 and opening 12
Open and close. Reference numeral 20 is a bush for sealing the valve rod 14.

The high pressure air for operating the piston device 10 is supplied from the high pressure tank 21 by the conduit 16, and the conduit 16
It is controlled by an electromagnetic three-way valve 22 inserted in 16.

Next, a bulk operation operation will be described using the apparatus described above. First, the fuel supply to the C ₁ , C ₃ , C ₅ , and C ₇ cylinders is stopped, the exhaust brake 4A closes the exhaust pipe 3A, and the exhaust passage switching valve device 2 causes the exhaust pipe 3A and the compressed air to flow as described above. When communicating with the extraction pipe 6, the C ₁ , C ₃ , C ₅ , and C ₇ cylinders function as an air compressor.

On the other hand, when the C ₁ , C ₃ , C ₅ , and C ₇ cylinders are not used as an air compressor, the electromagnetic three-way valve 22 shuts off the high pressure air A and releases the high pressure air A in the piston device 10 to the atmosphere. Thus, the valve 13 is closed.

By the way, when the air compressor is operated,
Inside the C ₁ , C ₃ , C ₅ , C ₇ and the exhaust pipe 3A, high-temperature exhaust gas during use as an internal combustion engine remains, and when this exhaust gas passes through the valve 13, The carbonized Harz-like oil component in the exhaust gas adheres and accumulates on the exhaust gas, and is sandwiched between the valve umbrella 18 and the valve seat 19 after valve closing as shown in F in the figure, where it solidifies and adheres both members. There is a problem of doing.

[Purpose of device]

The present invention has been made to solve the above-mentioned conventional problems, and is a vehicle in which an internal combustion engine using a part of cylinders as an air compressor has a limited mounting space and a limited fuel loading capacity. It is an object of the present invention to provide a switching valve device which is used for a vehicle and which can effectively prevent carbon from adhering to the switching valve for extracting compressed air.

[Constitution of device]

In order to achieve the above object, the configuration of the switching valve device of the present invention is a switching valve provided between an exhaust pipe and a compressed air extraction pipe of a multi-cylinder internal combustion engine for a vehicle that uses a part of cylinders as an air compressor. The part is equipped with an air nozzle that blows high-pressure air toward the valve body from the direction in which compressed air flows into the switching valve, and the high-pressure air is discharged from the air nozzle for a predetermined time from the start of use of the part of the cylinders as an air compressor. It is designed to be ejected.

The air nozzle generates a strong air flow around the switching valve portion, that is, around the valve and the valve seat, and carbonized oil in the exhaust gas staying in the exhaust pipe adheres to the valve and the valve seat of the switching valve. Is applied to prevent compressed air from being blown from the direction along the flow of compressed air as described above.

Since the high-pressure air is jetted from the air nozzle only while the exhaust gas staying in the exhaust pipe remains, it is suitable for the internal combustion engine to be used after the use as the internal combustion engine is stopped and the use as the compressor is started. It only needs to be done within a predetermined time. Therefore, the present invention is carried out in combination with a control device for ejecting high-pressure air from the air nozzle for a fixed time in conjunction with a device that operates as an air compressor.

The position of the air nozzle and the shape of the tip of the nozzle are not particularly limited as long as a strong air flow is blown to the valve seat and the valve surface portion in contact with the valve seat.

[Action]

The means for injecting high-pressure air from the air nozzles arranged in the direction in which the compressed air flows into the switching valve only for a predetermined time after switching some cylinders to the air compressor has a risk that carbon may adhere to the switching valve. By blowing a strong air flow to the switching valve only during the presence of the air, a small amount of high pressure air can effectively prevent carbon from adhering.

Therefore, it is possible to reduce the capacity of the high-pressure air device and the fuel consumption amount used to generate the high-pressure air as much as possible, and it is effective as a switching valve device for vehicles with a limited installation space and weight. Can be applied to.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of an essential part of an exhaust passage switching valve device according to an embodiment of the present invention.

In the drawing, the exhaust passage switching valve device 2 of the present invention is shown as a third
Similar to the conventional example in the figure, some of the cylinders C ₁ , C ₃ , C ₅ , and C ₇ are provided at positions where the compressed air extraction pipe 6 is branched from the exhaust pipe 3A of the internal combustion engine 1 which is used as an air compressor. The third one
The same members as those in FIGS. 4 and 5 are designated by the same drawing numbers, and the description thereof will be omitted.

Therefore, in this embodiment, as shown in FIG. 1, an air nozzle 25 is provided at the branch portion 12 of the exhaust pipe 3A so as to blow high-pressure air toward the back side of the valve 13, and a strong air flow is generated in this portion. , A strong air flow toward the casing 11 side is formed between the valve 13 and the valve seat 19 together with the air flow that is pumped later.

The conduit 26 for sending high pressure air to the air nozzle 25 is a solenoid valve 27.
Is connected to the high pressure air tank 21 via a solenoid valve 27
Are configured to be controlled by the controller 28.

That is, the bulk vehicle for transporting powder and granules equipped with the internal combustion engine 1 travels with the switching valve 13 closed during general traveling, but switches when the bulk operation switch 29 is turned on and the air compressor operation is switched on. Valve 13 opens. The high pressure air A is blown from the air nozzle 25 to the valve umbrella 18 and the valve seat 19 for a predetermined time during the predetermined time of the valve opening, that is, 30 seconds in the present embodiment, to prevent carbon adhesion.

As for the inner diameter of the air nozzle 25, according to the experiment result of the present inventor, in the case of a normal-sized bulk vehicle, it is 2.0 or more.
It is preferable to set it to about 2.6 mm, and if it exceeds 2.6 mm, the ejection pressure becomes low and the carbon removing effect cannot be obtained.

Further, in the case of the present embodiment, it is appropriate that the blowing time of the high-pressure air A is about 30 seconds, during which the internal combustion engine 1 performs idling operation, and the solenoid valve 21 for controlling the blowing of the high-pressure air A is operated. The operating conditions are shown in the flowchart of FIG.

That is, when the program starts in FIG.
In step 1, it is determined whether or not the in-vehicle bulk operation switch is turned on. When a negative result is obtained, the determination in step 1 is repeated again.

When the in-vehicle bulk operation switch 29 is turned on, a positive result is obtained, and in step 2, the operation of idling the internal combustion engine is performed, the exhaust brake 4A is closed, the exhaust passage switching valve device 10 is opened, and the solenoid valve is operated. The valve of 27 and the clock of the elapsed time after opening the solenoid valve 27 are executed. By this operation, the injection of high-pressure air from the air nozzle 25 to the valve 13 is started.

Next, in step 3, it is judged whether or not the set time of the timer, that is, 30 seconds in this embodiment, has passed. If a negative result is obtained, the judgment is repeated until a positive result is obtained, during which the air nozzle 25 outputs Injection of high pressure air is continued.

Step 3 after 30 seconds of high pressure air injection
If a positive result is obtained in step 4, the solenoid valve 22 is turned off in step 4, the injection of high-pressure air from the nozzle 25 is stopped, and the idling operation is canceled. In step 5, the in-vehicle bulk operation switch is turned on again. It is determined whether or not it has been done.

While the bulk operation continues, a negative result is obtained in step 5, and the determination operation of step 5 is repeated during that time, the bulk operation ends, and when the switch is turned off, a positive result is obtained and the program ends. .

In this embodiment, the temperature sensor 30 is provided upstream of the air filter 7 of the compressed air extraction pipe 6, and the exhaust brake 4A is opened when the temperature of the compressed air becomes a certain value or more within a predetermined time. In addition, by providing the controller 28 with the function of closing the electromagnetic three-way valve 22 and stopping the bulk work, high temperature compressed air is not sent to the granular material tank 8 and does not adversely affect the granular material. I did it.

[Effect of device]

As described above, the switching valve device of the present invention can obtain the following effects.

(1) Since the high pressure air is blown from the direction in which the compressed air supplied from the cylinder used as the air compressor flows into the switching valve toward the valve body, the compressed air from the air compressor is attached. A strong air flow can be obtained in cooperation with, and carbon in the exhaust gas can be effectively prevented from adhering between the valve body and the valve seat.

(2) Since the time for ejecting high-pressure air from the air nozzle is set to only the predetermined time after switching to the air compression operation, carbon should be attached to the switching valve with a small amount of high-pressure air, that is, a small fuel consumption amount. Can be efficiently prevented.

Therefore, it is possible to prevent carbon from adhering to the switching valve due to a more compact high-pressure air device and fuel consumption, prevent problems such as sticking of the valve disc to the valve seat, improve device reliability, and maintain and inspect Can be extended.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part of an exhaust passage switching valve device according to an embodiment of the present invention, FIG. 2 is an operation flowchart of the switching valve device of FIG. 1, and FIG. 3 is an internal combustion engine with variable number of cylinders. FIG. 4 is a detailed enlarged vertical cross-sectional view of the exhaust passage switching valve device of FIG. 3 showing the layout of the main portion of the attached exhaust passage switching valve device. 1 ... Internal combustion engine, 2 ... Exhaust pipe, 3A, 3B ... Exhaust brake, 4 ... Compressed air extraction pipe, 8 ... High pressure tank, 10 ...
Exhaust passage switching valve device, 11 ... switching valve, 13 ... valve seat, 21 ... air nozzle, 22 ... solenoid valve, 23 ... air pipe, 24 ... controller, A ... high pressure air.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location F16K 31/122

Claims (1)

[Scope of utility model registration request] 1. A direction in which compressed air flows into a switching valve portion provided in a switching valve portion provided between an exhaust pipe and a compressed air extraction pipe of a multi-cylinder internal combustion engine for a vehicle using a part of cylinders as an air compressor. A switching valve device in which an air nozzle for blowing high-pressure air toward the valve body is attached, and high-pressure air is ejected from the air nozzle for a predetermined time from the start of use of the part of the cylinders as an air compressor.