JPH10318104A - Fluid control valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid control valve for surely opening/closing a valve by the single system of a start valve controlling fluid line, in the fluid control valve controlling opening/closing a valve, by utilizing a part of a high-pressure fluid, performing opening/closing operation, as a control fluid. SOLUTION: In this fluid control valve device, a first passage 24 is blocked and a second passage 25 is opened to release a high-pressure fluid in a first pressure chamber B to atmospheric air, by moving a second piston 2 to a second pressure chamber D side pressed by a control fluid pressure 102 supplied to a control fluid pressure chamber A for energizing the fluid pressure in a valve- opening direction to a first piston 1, and on the other hand the passage 25 is blocked and the passage 24 is opened to introduce the high-pressure fluid to the pressure chamber B, by moving the piston 2 to a control fluid pressure receiving part side, through releasing the pressure 102 supplied to the chamber A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid control valve for performing valve opening / closing control using a part of a high-pressure fluid for opening / closing operation as a control fluid, and more particularly, to starting a starting air system of a pneumatic starting internal combustion engine. The present invention relates to a fluid control valve suitably applied as a valve.

[0002]

2. Description of the Related Art A conventional starting valve and starting air system for an internal combustion engine are shown in FIGS. As shown in FIG. 7, in the pneumatic start type internal combustion engine, the internal combustion engine 20 starts from the starting air tank 100 through the start valve 10 when the internal combustion engine is started.
The high-pressure starting air 101 supplied into the cylinder rotates the internal combustion engine by pushing down the piston 40, and then starts the internal combustion engine by charging fuel. The starting valve 10 supplies the starting air to the internal combustion engine /
Start valve control (control) in which the high-pressure air supplied from the start air tank 100 is shut off and the discharge timing is adjusted by the start valve control device 110
By supplying the air 102 and 103 to the starting valve control unit, the opening and closing operation of the starting valve 10 is performed.

[0003] Such a starting air system is often used in a marine internal combustion engine or the like. However, in a marine internal combustion engine, the starting air system is not merely a device for starting the internal combustion engine, but is used when the internal combustion engine is rotated in reverse. Is an important system for starting and stopping a ship because it also has a function to stop the internal combustion engine. In addition, in order to reliably start or stop the internal combustion engine, the start valve used in the system needs to control opening and closing timing of the start valve reliably.

[0004] In response to such demands, a start valve shown in FIGS. 6 and 8 has been put to practical use. The start valve 10 shown in FIG. 6 is hermetically mounted between passages 21 and 22 communicating with a combustion chamber in a cylinder of the internal combustion engine 20, and includes a passage 41 for introducing a high-pressure fluid 101 from the passage 21. , And a first control fluid pressure chamber A ′ and a second control chamber B ′ separated by a first piston 1 ′ described later, and a high pressure fluid pressure chamber C below the first control fluid pressure chamber A ′. Valve case 4 having a stepped cylindrical cylinder space, and high-pressure fluid passages 21 and 22 slidably interposed in the valve case 4 along the axial direction and communicating through a passage 41 of the valve case 4. A valve body 30 that opens and closes between the valve bodies, a valve rod 3 extending vertically from an upper end of the valve body 30 and protruding from an upper surface side of a valve box 4, and a stepped cylindrical cylinder space mounted on the valve rod 3. The first control fluid pressure chamber A ′ is slidably disposed in the inside, as described above. It has a second control fluid pressure chamber B 'and a piston 1' partitioning the high pressure fluid pressure chamber C below the second control fluid pressure chamber B '.

[0005] The top of the piston 1 'is vertically extended in a cylindrical shape so as to surround the valve rod 3 and protrudes from the upper surface side of the valve box 4, and is extended to the screw cutting position at the upper end of the valve rod 3. The fixing nut 5 is screwed to the upper end of the valve rod 3 via the spring 6 and the washer 51 (spring receiver). As a result, the piston 1 'and the valve element 30 are integrated, and the valve element 30 opens and closes following the reciprocating movement of the piston 1'.

In this configuration, when the start valve control air (valve opening air) 102 is supplied to the control chamber A ', the piston 1' and the valve body 30 are pushed down against the force of the spring 6 against the force of the spring 6. The opening of the starting valve 10 (between the high-pressure fluid passages 21 and 22) causes the starting air 101 to be supplied into the cylinder of the internal combustion engine 20. Thereafter, at a certain time, the starting valve control air (opening air) 102 is supplied to the starting valve control device 30.
Opened to the atmosphere, start valve control air (closed air) 103
Is supplied to the control fluid pressure chamber B 'of the start valve 10, the start valve piston 1' is pushed up in cooperation with the force of the spring 6, and the start valve 10 closes.

FIG. 8 shows a start valve in which the start valve closing control air line 103 is omitted from the start valve 10 of FIG. 6 and the valve closing operation is performed by increasing the urging force of the valve closing spring 6 instead. However, there is a problem in the reliability of opening / closing operation of the start valve only by the urging force of the valve closing spring 6, and when the start valve is not reliably closed, the combustion flame in the cylinder enters the start air pipe. In the worst case, the starting air pipe may explode. In the case of a ship, it may be impossible to start and stop the ship.

[0008]

Accordingly, the opening and closing operation of the start valve, particularly the valve closing operation, is very important in starting and stopping the internal combustion engine. It is necessary to provide the cylinder with two control functions. In addition, in order to perform a reliable valve closing operation, as shown in FIG. 6, the starting valve control air line needs to be provided with two pipes for each cylinder.

The present invention relates to a fluid control valve for performing valve opening / closing control using a part of a high-pressure fluid for performing opening / closing operations as a control fluid. It is an object of the present invention to provide a fluid control valve which can be reliably performed, and in particular, to provide a fluid control valve suitably applied as a starting valve of a starting air system of a pneumatic starting internal combustion engine.

[0010]

SUMMARY OF THE INVENTION The present invention comprises a high pressure fluid supply source 100 for supplying high pressure fluid, high pressure fluid passages 21,
2, a control fluid pressure supply control means 110 for controlling the opening and closing of the valve 30 by high-pressure fluid from the high-pressure fluid supply source 100, and a first valve for contacting the valve 30 and opening and closing the valve 30. , A control fluid pressure chamber A that is supplied with control fluid pressure from the control means 110 and urges the first piston 1 with fluid pressure in a valve opening direction, and the first piston 1. And a first pressure chamber B formed at a position facing the control fluid pressure chamber A and biasing the first piston 1 in a valve opening direction in the valve opening direction. A second piston 2 slidably disposed on the control fluid pressure receiving side of the piston 1 and a control fluid pressure receiving portion formed at a position opposed to the control fluid pressure receiving portion via the second piston 2; A second pressure chamber D having a pressure receiving area smaller than the partial area; High-pressure fluid passage 2 through the pressure chamber D
A first passage 24 for introducing a high-pressure fluid into the first pressure chamber B from the side of 1-42 to C, and a second passage 25 communicating the first pressure chamber B with the atmosphere opening portion 23; The second piston 2 moves to the second pressure chamber D side by the control fluid pressure 102 supplied to the control fluid pressure chamber A, thereby closing the first passage 24 and opening the second passage 25. Then, the high-pressure fluid in the first pressure chamber B is released to the atmosphere, while the control fluid pressure 102 supplied to the control fluid pressure chamber A is released to the second.
By moving the piston 2 toward the control fluid pressure receiving portion side, the second passage 25 is closed and the first passage 24 is opened to introduce high-pressure fluid into the first pressure chamber B. The proposed fluid control valve device.

In order to specifically explain the present invention, for example, when the control valve 10 is applied as a starting valve for an internal combustion engine, as shown in FIG. , The high-pressure starting air is supplied from the high-pressure fluid chamber C to the passage 2.
4 and enters the second pressure chamber D, pushes up the ring-shaped second piston 2 and opens the first passage 25 and closes the second passage 26. As a result, a high pressure is applied to the first pressure chamber B. Air is supplied, and the valve body 30 of the start valve is closed.

On the other hand, when the starting valve control air having the same pressure as the starting air is supplied to the control fluid pressure chamber A, (pressure receiving area on the control fluid pressure chamber A side)> (pressure receiving area on the second pressure chamber D side) area)
Is lowered, the air pressure in the first pressure chamber B closes the first passage 24 and opens the second passage 25 and is released to the atmosphere. As a result, the first piston 2 1 is depressed, the valve element 30 of the start valve is opened, and high-pressure start air is supplied into the cylinder of the internal combustion engine 20. When the control air 102 of the start valve 10 is stopped and released to the atmosphere,
The pressure of the high-pressure fluid chamber C on which the starting air pressure acts is transmitted to the second pressure chamber D, and pushes up the second piston 2 to cause the first piston 2 to move upward.
The first passage 24 is opened and the second passage 25 is closed,
The starting air is supplied to the pressure chamber B, and the starting valve 10 is closed to return to the state at the time of starting standby.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, and are merely illustrative examples. Only. 1 to 5 show a first embodiment of the present invention. FIG. 1 shows a start valve showing a state when the valve is closed (start standby), and FIG. 2 shows a start valve showing a state when the valve is open.
And FIG. 4 is a cross-sectional view showing details of the first piston unit 1 of FIGS. 1 and 2 respectively. FIG. 5 shows a starting air system for an internal combustion engine using the starting valve according to the present embodiment.

The start valve 10 has high-pressure fluid passages 41 and 42, as in FIG. 6, and a control fluid pressure chamber A and a fluid pressure chamber A separated by a first piston 1 described below.
A valve box 4 having a stepped cylindrical cylinder space forming a first pressure chamber B having a smaller pressure receiving area and a high-pressure fluid pressure chamber C below the first pressure chamber B, and sliding in the valve box 4 along the axial direction. A valve body 30 movably interposed between the high-pressure fluid passages 21 and 22 communicating via a passage 41 of the valve box 4, and a valve body 30 extending vertically from an upper end of the valve body 30 and extending from an upper surface side of the valve box 4. A protruding valve stem 3, and a ring disposed around the valve stem 3 and slidably disposed in the cylinder space of the stepped cylindrical shape. As described above, the control fluid pressure chamber A, the first pressure chamber B, And a first piston body 1 which partitions a high-pressure fluid pressure chamber C therebelow. The top of the piston body 1 is vertically extended in a cylindrical shape so as to surround the valve rod 3 and protrudes from the upper surface side of the valve box 4. The fixing nut 5 is screwed onto the upper end of the valve rod 3 via the washer 51 (spring receiver).

As a result, the first piston 1 and the valve body 3
0 is integrated, and the valve body 30 performs opening and closing operations following the reciprocation of the piston. On the control fluid pressure chamber A side of the upper surface of the first piston 1, an L-shaped ring-shaped step groove on one side is recessed, and the second piston 2 is slidably fitted in the step groove. The second piston 2 has a second pressure chamber D
And the pressure receiving area on the upper surface side (the control fluid pressure chamber A side) is set to be larger than the pressure receiving area on the bottom surface side (the second pressure chamber D side). Between the second pressure chamber D and the high-pressure fluid chamber C and between the second pressure chamber D and the first pressure chamber B, there are provided communication holes 24a and 2a, respectively.
4b is provided to function as a first passage 24 for introducing a high-pressure fluid from the high-pressure fluid chamber C side to the first pressure chamber B via the second pressure chamber D.

An air passage groove 25a is provided on the outer peripheral surface of the lower trunk portion of the second piston 22, and an air passage groove 25b is provided on the inner peripheral surface. An air passage hole 25c communicating the groove 25a with the groove 25b is provided. Provided. An air release air passage 23 is formed on the center axis of the valve stem 3 and communicates with the groove 25b through a communication hole 25d which communicates with the first piston 1. It functions as a second passage 25 communicating with the opening 23. The ring 7 attached to the upper surface of the first piston 1 is a stopper for the ring-shaped second piston 2.

Next, the operation principle will be described with reference to FIGS. 1. At the time of standby for starting the internal combustion engine This will be described with reference to FIGS. 1, 3 and 5. The starting air 101 supplied from the starting air tank 100 is supplied to the passage 21,
The fluid is supplied to the high-pressure fluid chamber C through the passage 42 of the valve box 4. The starting air 101 passes through the communication hole 24a, pushes up the ring-shaped second piston 2, and is supplied to the first pressure chamber B through the opened communication hole 24b. The supplied start-up air 101 pushes up the first piston 1 and follows up the push-up of the valve stem 3 and the valve body 30, whereby the start-up valve 1
0 is closed.

2. At the time of starting valve control air supply This will be described with reference to FIGS. 2, 4 and 5. To start the internal combustion engine, the start valve control device 110 controls the start valve control (control) air 1 for each cylinder at an appropriate timing.
02 is supplied. High-pressure air similar to the starting air 101 is supplied to the starting valve control device 110 from the starting air tank 100. When the start valve control air 102 is supplied to the control fluid pressure chamber A of the start valve 10, since the pressure of the start valve control air 102 = the pressure of the start air 101, the ring-shaped second piston 2
By setting (pressure receiving area on the control fluid pressure chamber A side)> (pressure receiving area on the second pressure chamber D side), it overcomes the push-up force from the second pressure chamber D side and the ring-shaped second The second piston 2 is pushed down. Thereby, the communication hole 24b of the first piston 1 is connected to the high-pressure fluid chamber C and the communication hole 24.
a, and the air pressure in the first pressure chamber B
4b, air passage groove 25 of ring-shaped second piston 2
a, the communication hole 25c, and the air passage groove 25b, in that order, through the communication hole 25d of the first piston 1, and then to the atmosphere through the atmosphere opening hole 23 of the valve rod 3.

Accordingly, the first piston 1 is pushed down by the pressure of the start valve control air 102, the valve rod 3 is pushed down, the start valve 10 is opened, and the start air 101 is supplied into the cylinder of the internal combustion engine 20, By depressing the piston 40, the internal combustion engine rotates. Thereafter, the internal combustion engine is started by charging the fuel at an appropriate timing.

3. At the start valve closing operation, the supply of the start valve control air 102 is stopped, and the operation of releasing the air pressure to the atmosphere is performed by the start valve control device 110, so that the pressure of the control fluid pressure chamber A becomes the atmospheric pressure,
The pressure of the high-pressure fluid chamber C to which the starting air 101 is supplied is transmitted to the second pressure chamber D and pushes up the second piston 2, and the starting air 101 is supplied to the first pressure chamber B to start up. The valve returns to the state at the time of standby for starting the internal combustion engine as shown in FIGS.

[0021]

As described above, according to the present invention, only one system of control fluid pressure (valve opening control fluid) needs to be controlled. The ON / OFF timing control of the control fluid pressure is performed, so that the control device can be simplified and downsized. Further, since the number of control fluid lines (pipes) of the fluid control valve can be reduced by half, simplification can be achieved. Further, when the fluid control valve is applied as a starting valve of an internal combustion engine, the starting air (control air) consumption can be reduced, and the capacity of the auxiliary equipment can be reduced. The safety of starting the internal combustion engine can be made equal to that of the conventional two-system system while simplifying and reducing the size.

[Brief description of the drawings]

FIG. 1 is an overall cross-sectional view of a start valve (at a start standby) showing a state when a valve is closed according to a first embodiment of the present invention.

FIG. 2 is an overall cross-sectional view of the starting valve showing a state when the valve is opened according to the first embodiment of the present invention.

FIG. 3 is a sectional view of a main part showing details of a first piston of FIG. 1;

FIG. 4 is a sectional view of a main part showing details of a first piston of FIG. 2;

FIG. 5 shows a starting air system for an internal combustion engine using the starting valve according to the present embodiment.

FIG. 6 is an overall sectional view of a conventional two-system control air start valve.

FIG. 7 is a diagram of a conventional two-system internal combustion engine starting air system.

FIG. 8 is an overall sectional view of a conventional one-system control air start valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st piston 2 2nd piston 3 valve stem 30 valve body 4 valve box 5 nut 6 spring 10 start valve 20 internal combustion engine 100 start valve control device 101 start air 102 start valve control air

Claims (1)

[Claims] A high-pressure fluid supply for supplying a high-pressure fluid;
A valve element that opens and closes the high-pressure fluid passage, control fluid pressure supply control means that controls opening and closing of the valve element by high-pressure fluid from a high-pressure fluid supply source, a first piston that contacts the valve element and opens and closes the valve element; A control fluid pressure chamber which is supplied with control fluid pressure from the control means and urges the first piston with fluid pressure in a valve opening direction; and a position opposed to the control fluid pressure chamber via the first piston. And a first pressure chamber for urging the first piston with fluid pressure in a valve opening direction, the first piston being slidably disposed on a control fluid pressure receiving side of the first piston. A second pressure chamber formed at a position facing the control fluid pressure receiving portion via the second piston, and having a pressure receiving area smaller than the control fluid pressure receiving portion area; A first pressure chamber from the high-pressure fluid passage side through the second pressure chamber; A first passage for introducing a high-pressure fluid, and a second passage for communicating the first pressure chamber with the atmosphere opening portion, wherein a second piston is formed by a control fluid pressure supplied to the control fluid pressure chamber. Moves to the second pressure chamber side, thereby closing the first passage and opening the second passage to release the high-pressure fluid in the first pressure chamber to the atmosphere, while supplying the high-pressure fluid to the control fluid pressure chamber. By releasing the control fluid pressure, the second piston moves toward the control fluid pressure receiving portion, thereby closing the second passage and opening the first passage to supply high-pressure fluid to the first pressure chamber. A fluid control valve device to be introduced.