JPH05340483A - Check valve with opening auxiliary device - Google Patents

Abstract

PURPOSE:To perform rapid operation to open and close a valve body, to reduce pressure loss, and to reduce the occurrence of chattering by regulating a moment arm according to movement of weight during opening and closing operation of the valve body. CONSTITUTION:When fluid to be controlled flows in a forward direction to a valve body 1, a valve body 2 is rocked from a full closed position to a full opening position, and along with rocking of the valve body 2, an arm 4, an auxiliary arm 5, a rail 8, and a weight 9 are rocked. Further, when the valve body 2 is opened to a specified opening or more, the tip side of the rail 8 is brought into a down gradient posture in a rocking direction and the weight 9 is moved to the tip side of the rail 8 under gravity. The weight 9 is stopped in a position on the tip side of the rail 8 with an impact relaxing device 13, and along with movement of the weight 9, the moment length of a moment in a closing direction is increased. This constitution causes rapid opening of the valve body 2 toward a full opening position through the increase of a moment in an opening direction, and reduces the occurrence of chattering simultaneously with reduction of pressure loss.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check valve with an opening degree assisting device which surely opens and closes a valve element even at a low flow rate or when a compressible light specific gravity fluid such as air is used as a controlled fluid. ..

[0002]

2. Description of the Related Art Generally, a check valve is provided with a valve body for opening and closing a flow path in a valve box, which is swingable around an axis of a horizontal valve shaft. It is opened by being pushed by the flow and maintains the opening corresponding to the flow rate. Further, the valve body closes by its own weight when the forward flow of the controlled fluid stops.

[0003]

In the above-mentioned conventional structure, since the valve body maintains the opening according to the flow rate of the controlled fluid, the flow rate of the controlled fluid is small or the controlled fluid is controlled. When the fluid is a fluid such as air with a low specific gravity, it is difficult to open the valve body to a sufficiently large opening,
There is a problem that the pressure loss applied to the controlled fluid by the valve body increases.

Further, when the compressible controlled fluid is pressure-fed by a blower or the like, there is a problem that the valve body is apt to chatter at a small flow rate. The present invention solves the above problems, and even when the controlled fluid flows at a small flow rate,
Alternatively, it is an object of the present invention to provide a check valve with an opening degree assisting device that can surely open the valve element greatly even when the controlled fluid is a compressive fluid such as air.

[0005]

In order to solve the above problems, a check valve with an opening degree assisting device according to the present invention is provided in a valve box rotatably around an axis of a horizontal valve rod. A check valve that includes a valve body that swings upward from the closed position toward the fully open position, the valve body swings in the fully open direction by the forward flow, and at least swings back to the fully closed position by the weight of the valve body. In the above, the valve rod is provided with an arm that swings integrally with the valve body around the axis of the valve rod, and a rail with an adjustable mounting angle is swingable on the arm as the valve body swings in the fully open direction. The rail is provided with a weight that moves by its own weight using the rail as a guide, and a shock absorbing device for receiving the weight on the base end side and the tip end side of the rail is provided on the rail. Install one shock absorber on the tip of the rail. It is obtained by the position adjustable provided configuration along the moving direction of the yarn.

[0006]

With the above structure, the closing moment due to the weight of the valve body and the opening moment due to the weight of the arm, rail and weight act around the axis of the valve rod.

When the fluid to be controlled flows in a forward flow, the valve body swings from the fully closed position to the fully open position, and the arm and rail swing as the valve body swings. further,
When the valve body opens beyond a certain opening, the rail becomes a downward slope toward the swinging direction, the weight moves to the tip side of the rail due to its own weight, and the impact absorbing device receives the weight at the tip side of the rail, The length of the moment arm at the closing moment increases with the movement of. The maximum length of this moment arm is adjusted by adjusting the position of the shock absorber provided on the tip side of the rail to change the amount of movement of the weight, and when the moment arm is at its maximum, the opening moment is closed. The amount of movement of the weight and the weight of the weight are adjusted so as to be slightly smaller than the directional moment.

Therefore, even if the controlled fluid has a small flow rate or is a controlled fluid having a compressive light specific gravity such as air, the valve element is quickly and fully opened due to the increase in the opening moment due to the movement of the weight. Opening toward the position reduces pressure loss and reduces chattering.

When the forward flow of the controlled fluid stops or the reverse flow flows, the valve body returns to the fully closed position by the closing moment that exceeds the opening moment. At this time, the arm and rail swing as the valve body swings in the fully closing direction, and when the valve body closes to a certain opening, the rail becomes a downward slope toward the base end side and the weight weighs itself. By returning to the base end side of the rail, the valve element promptly closes toward the fully closed position due to the reduction of the opening moment, and chattering is reduced.

Then, by changing the rail angle with respect to the arm and adjusting the opening of the valve body in which the rail is in a downwardly sloping posture toward the tip side, it is possible to cope with arbitrary operating conditions that differ depending on the property of the controlled fluid. can do. Further, by receiving the weights by the impact absorbing devices provided at the starting point and the ending point of the weight movement, it is possible to reduce the impact at the time of collision and suppress chattering.

Further, since the weight is attached to the rail via the bearing, the weight is free to rotate with respect to the rotation of the bearing when moving on the rail, so that the bearing easily rolls and the weight moves quickly. Can be done.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Inside the valve box 1, there is a valve body 2 for opening and closing the flow path inside the valve box.
And the valve element 2 is swingable around the axis of the horizontal valve rod 3 and swings upward from the fully closed position, which is a downward, almost vertical posture, toward the fully open position, It swings in the fully open direction by the forward flow flowing into the valve box 1, and swings back to the fully closed position due to at least the weight of the valve body 2. Also,
The valve box 1 rotatably supports the valve rod 3, and the valve rod 3 swings integrally with the valve body 2. Further, the valve rod 3 has a valve box 1 at one end.
Airtightly protrudes to the outside, and an arm 4 is provided at one end of the valve rod 3 by means of serrations or splines so that its mounting angle can be adjusted.

The arm 4 is provided with an auxiliary arm 5, and a plurality of bolt holes 6 are formed in the arm 4 and the auxiliary arm 5. Also, the arm 4 and the auxiliary arm 5
The rail 8 is attached by being supported at two points by bolts 7 which are inserted into the appropriate bolt holes 6 of the arm 8 by replacing the bolt holes 6 of the arm 4 and the auxiliary arm 5 with each other.
Also, the mounting angle with respect to the auxiliary arm 5 can be adjusted. This mounting angle is set such that the rail 8 integrally swings with the valve body 2 in a swinging direction toward the fully open direction so that the tip end side has a downward slope in the swinging direction.

The rail 8 is provided with a weight 9 which moves by its own weight along the guide groove 8a.
Supports the support shaft 10 of the weight 9 via a bearing 11. Further, a shock absorbing device 1 such as a spring is provided on the base end side and the tip end side of the rail 8 to receive the weight 9.
2 and 13 are provided, and one of the impact absorbing devices 13 attached to the tip end side of the rail 8 via the adjusting bolt 14 can adjust the position along the moving direction of the weight 9.

The operation of the above structure will be described below.
In the state where the valve body 2 is in the fully closed position, the rail 8 is in eight forces with the base end side fixed to the arm 4 and the auxiliary arm 5 having a downward slope, and the weight 9 is located on the base end side of the rail 8. .. Further, a moment in the closing direction due to the own weight of the valve body 2 and a moment in the opening direction due to the own weight of the arm 4, the auxiliary arm 5, the rail 8 and the weight 9 act around the axis of the valve rod 3.

When the fluid to be controlled flows into the valve box 1 in the forward direction, the valve body 2 swings from the fully closed position to the fully open position, and as the valve body 2 swings, the arm 4 and the auxiliary arm. 5, the rail 8, and the weight 9 swing. Further, when the valve body 2 is opened to a certain degree or more, the rail 8 has a downwardly inclined posture toward the swing direction, the weight 9 moves to the tip side of the rail 8 by its own weight, and at the tip side of the rail 8. The shock absorbing device 13 receives the weight 9, and the length of the moment arm in the closing moment increases as the weight 9 moves.

The maximum length of this moment arm is adjusted by adjusting the position of the shock absorbing device 13 provided on the tip side of the rail 8 with the adjusting bolt 14 to change the moving amount of the weight 9, and the maximum moment arm is obtained. In such a state, the moving amount of the weight 9 and the weight of the weight 9 are adjusted so that the opening moment is slightly smaller than the closing moment.

Therefore, even if the controlled fluid has a small flow rate or is a controlled fluid having a compressive light specific gravity such as air, the valve body 2 is quickly moved by the increase of the opening moment as the weight 9 moves. In addition, the pressure loss is reduced and chattering is reduced by opening toward the fully open position.

When the normal flow of the controlled fluid stops or the reverse flow flows, the valve body 2 is returned to the fully closed position by the closing moment exceeding the opening moment. At this time, the arm 4, the auxiliary arm 5, the rail 8 and the weight 9 swing with the swing of the valve body 2 in the fully closing direction, and when the valve body 2 is closed to a certain opening, the rail 8 is on the proximal side. Since the weight 9 returns to the base end side of the rail 8 due to its own weight, the valve body 2 promptly closes toward the fully closed position due to the decrease in the opening moment, and the chattering decreases. To do.

Then, the mounting angle of the arm 4 with respect to the valve rod 3 and the mounting angle of the rail 8 with respect to the arm 4 and the auxiliary arm 5 are changed, and the opening of the valve body 2 in which the rail 8 has a downward slope toward the tip side. By adjusting the degree, it is possible to deal with arbitrary operating conditions that differ depending on the properties of the controlled fluid.

Further, by receiving the weight 9 by the impact mitigating devices 12 and 13 provided at the starting point and the ending point of the weight movement, the impact at the time of collision can be mitigated and the chattering can be suppressed.

Further, since the weight 9 is attached to the rail 8 via the bearing 11, the rotation of the weight 8 becomes a free system with respect to the rotation of the bearing 11 when moving in the guide groove 8a of the rail 8, and the bearing 11 Becomes easier to roll, and the weight 9 can be moved quickly.

[0023]

As described above, according to the present invention, the moment arm increases or decreases with the movement of the weight during the opening / closing operation of the valve body, so that even if the flow rate of the controlled fluid is small, air or the like is used. Even with a controlled fluid having a compressible light specific gravity, the valve element can be quickly opened and closed by increasing or decreasing the opening moment, the pressure loss is reduced, and chattering is reduced.

By adjusting the rail angle with respect to the arm and the maximum length of the moment arm, it is possible to meet arbitrary operating conditions that differ depending on the property of the fluid to be controlled, and the impact mitigating device mitigates the impact at the time of collision. Therefore, chattering can be suppressed.

Further, the rotation of the weight becomes a free system with respect to the bearing moving on the rail, the bearing easily rolls, and the weight can be moved quickly.

[Brief description of drawings]

FIG. 1 is an overall front view of a check valve with an opening assisting device showing an embodiment of the present invention.

[Explanation of symbols]

 1 valve box 2 valve body 3 valve rod 4 arm 6 bolt hole 8 rail 9 weight 11 bearing 12, 13 shock absorber 14 adjustment bolt

Claims (1)

[Claims] 1. A valve body provided rotatably around an axis of a horizontal valve rod in a valve box and swinging upward from a fully closed position toward a fully opened position, the valve body having a positive flow direction. In the check valve that swings in the fully open direction by at least, and swings back to the fully closed position at least by the weight of the valve body, an arm that swings around the axis of the valve body integrally with the valve body is provided on the valve stem. Provided on the arm is a rail whose mounting angle is adjustable so as to have a downward slope in the swing direction as the valve body swings in the fully open direction.
A weight that moves by its own weight using this rail as a guide is provided on the rail via a bearing, and a shock absorbing device for receiving the weight is provided on the base end side and the tip end side of the rail.
A check valve with an opening degree assisting device, wherein one of the shock absorbing devices located on the tip side of the rail is provided so that its position can be adjusted along the moving direction of the weight.