JPH081608U - Overflow prevention valve - Google Patents

Abstract

(57) An object of the present invention is to provide an overflow prevention valve capable of delaying the operation of a valve body and smoothly operating the valve body under this condition. SOLUTION: A valve body (3) is arranged so as to face a valve seat (20) formed in a tubular main body (1) from its upstream side, and the valve body (3) is equipped with the valve body (3). The valve shaft is movably supported in the axial direction by a frame extending from the inner peripheral surface of the main body (1), and a spring (4) for urging the valve body (3) to the upstream side is provided. Overflow prevention valve of the type in which the size of the valve body (3) and the urging force of the spring (4) are set to predetermined values so that the valve body (3) fits into the valve seat (20) in the outflow state. At the valve body
At the center of the frame body (51) provided on the upstream side of (3), a disc (7) with a diameter approximately matching the diameter of this valve body (3) is placed at a right angle to the flow path in the main body (1). Set up.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to an overflow prevention valve, in particular, when a plate-shaped valve element is inserted into a gas circuit and the valve element is biased to the upstream side so that a certain amount of gas flows in the gas circuit. The present invention relates to a device for automatically shutting off a circuit, and in this kind of overflow prevention valve having a relatively large operation flow rate, it is possible to delay the operation of the valve element and prevent chattering operation. .

[0002]

[Prior art]

 An overflow prevention valve to be inserted into a gas circuit, in which a tapered valve seat (20) is formed in a cylindrical main body (1), and this valve seat (20) is expanded toward the upstream side. At the same time, the disc-shaped valve body (3) having a size to be fitted and contacted with the valve seat (20) is movably accommodated in the main body (1), and the valve shaft of the valve body (3) is accommodated. (31) is supported by a frame body, and this valve body is positioned coaxially with the main body (1) and upstream of the valve seat (20), and further between the frame body and the valve body (3). An overflow prevention valve of the type in which a spring (4) for biasing the upstream side is interposed is disclosed in Japanese Utility Model Laid-Open No. 1-75673. (Refer to Fig. 8) In this type of overflow prevention valve, since the valve element (3) is plate-shaped, its weight (mass) does not increase even if the diameter of this valve element increases. Even in the case of an overflow prevention valve of a type (so-called omnidirectional type) which is housed in a large gas circuit and is always urged to the upstream side by the spring (4), the valve body (3) operates smoothly in the overflow state. However, in this conventional device, when an overflow condition occurs, it instantaneously operates, so when the operation of the device is started when the device equipped with a solenoid valve is connected to the downstream side, There is an inconvenience that the overflow prevention valve is activated at the start.

Normally, an overflow prevention valve is inserted in the gas cock or in the vicinity thereof, and when the gas cock is opened to put the appliance in an operating state, the solenoid valve in the appliance is suddenly opened to temporarily A sudden gas flow occurs in the valve body (3), and the valve body (3) is put under the same condition as the overflow condition (pseudo-overflow condition). If the duration of this pseudo-overflow condition is shorter than the operating time of the valve body (3), the valve body (3) will be activated during this period.

In order to eliminate such inconvenience, in the case where a ball valve is used as the valve body (3), a projection with which the surface of the ball valve collides with the inner peripheral surface of the main body (1) in the movement path of the ball valve is provided. There are known arrangements and arrangements of ridges in the shape of a coil, but when this known method is applied to an overflow prevention valve of the above type that uses a plate-shaped valve body (3), , The smooth movement of the valve body (3) cannot be secured. This is because the valve body (3) is plate-shaped, so that its peripheral edge is easily caught, which causes malfunction. Further, if the seat portion of the valve body (3) is deformed or damaged due to the collision between the valve body (3) and the protrusion, a sealing failure will occur when the valve is closed.

[0005]

[Problems to be solved by the device]

 According to the present invention, the valve body (3) is arranged so as to face the valve seat (20) formed in the tubular main body (1) from the upstream side as described above. The valve shaft provided in (3) is movably supported in the axial direction by a frame body that extends from the inner peripheral surface of the main body (1), and at the same time, a spring (for urging the valve body (3) to the upstream side). 4) is provided, and the size of the valve body (3) and the biasing force of the spring (4) are set to predetermined values so that the valve body (3) fits into the valve seat (20) in the case of over-flow. In this type of overflow prevention valve ", the task is to delay the operation of the valve body (3) and to make the valve body (3) operate smoothly under this condition.

[0006]

[Means for Solving the Problems]

 The technical means of the present invention taken in order to solve the above-mentioned problem is that the diameter of the frame (51) provided on the upstream side of the valve body (3) is approximately the same as the diameter of the valve body (3). The disk (7) is provided at a right angle to the flow path in the main body (1). "

[0007]

The above technical means of the present invention operates as follows. Since the valve body (3) is urged to the upstream side by the spring (4), it is in contact with the frame body (51) located on the upstream side of the valve body (3) in the valve opening position. There is. Further, since the frame body (51) is provided with a disc (7) having a diameter substantially equal to the diameter of the valve body (3), the disc (7) is discriminated in the direction of gas flow in the main body (1). (7) → Close the valve body (3) in this order in series.

In this state, when the gas flow rate in the main body increases and the value reaches the set flow rate, the valve body (3) moves to the downstream side by the gas flow generated on the downstream side of the disc (7). It is pressed and fits into the valve seat (20). That is, the overflow prevention valve has been activated. When the circuit on the downstream side of the main body (1) is suddenly opened to the normal opening, the flow rate is instantaneously similar to the overflow state, but the disc on the upstream side of the valve body (3). Since (7) is located close to the valve body (3), most of the abrupt pressure difference generated near the valve body (3) at this time is received by the disc (7) and is not directly applied to the valve body (3). Does not work. Therefore, even if the flow rate is instantaneously the same as the overflow state, the valve body (3) will not operate depending on this.

In a normal overflow state, that is, when a flow rate equal to or higher than the set flow rate continuously flows in the main body (1), the downstream side of the disc (7) is passed after a certain time has elapsed after the overflow state. Flow rate condition, that is, the pressure difference in this part becomes a predetermined value, and the valve body (3) is moved to the downstream side. When this movement causes the valve body (3) to move to the downstream side and widen the distance from the disc (7), the valve body moving force due to the gas flow in the main body (1) acts significantly. Then, the valve element (3) is fitted into the valve seat (20) by this large moving force. After that, the valve will be closed by the gas pressure.

Even if the upstream side of the valve body (3) momentarily becomes a negative pressure state or a low pressure state due to the pressure fluctuation caused by the rapid closing of the valve body (3) after closing the valve body (3), Since the disc (7) is located on the upstream side, the pressure fluctuation is alleviated by this.

[0011]

[Effect of device]

 The present invention having the above-mentioned configuration has the following unique effects. Even if a sudden overflow condition occurs temporarily, the valve body (3) does not operate.Therefore, even if the downstream side of the overflow prevention valve is suddenly opened, this open state is an abnormal overflow condition. Unless otherwise, there is no concern that the disc (3) will move.

The valve body (3) operates slowly in the initial stage of valve closing and is fitted into the valve seat (20) with a large moving force, so that the valve closed state is stable. In addition, since the pressure fluctuation due to the sudden closing of the circuit after the valve is closed is reduced near the upstream side of the valve body (3), the chattering phenomenon due to this pressure fluctuation can be prevented.

[0013]

[Embodiment of device]

 Hereinafter, an embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 to 4, the overflow prevention valve of this embodiment includes a main body (1), a valve seat body (2) made of rubber or metal (metal material) attached to the main body (1), The valve shaft (33) protruding downstream of the valve body (3) and the valve shaft (31) protruding upstream of the valve body (3) and the valve shaft mounted at the downstream end of the main body (1) and It consists of a reset body (6) facing the downstream end of (33). This point is the same as the above-mentioned conventional example.

The valve body (3) includes a frame body (5) located on the downstream side of the installation portion of the valve seat body (2) and a frame body (51) located on the upstream side of the valve seat body (2). The valve shaft (33) is inserted into the cylindrical part (53) formed in the central part of the frame (5), and the valve shaft (31) is formed in the central part of the frame (51). It is loosely fitted in the formed through hole portion (52). As shown in FIGS. 3 and 4, the frame body (51) is provided with a disc (7) concentric with the through hole portion (52), and the disc has a diameter of this embodiment. In, the diameter of the valve body (3) is made to approximately match. The diameter of the disk (7) may be slightly larger than the diameter of the valve body (3), or may be smaller than the diameter of the valve body (3), or may be the same.

There is an enlarged diameter portion (54) at the upstream end of the tubular portion (53) on the downstream side of the valve body (3). The stepped portion of this enlarged diameter portion (54) and the valve body (3 The spring (4) is interposed between the downstream end face of (1) and (3), and the spring (4) exerts an urging force on the upstream side of the valve body (3). Further, a shaft portion (61) which is an upstream side portion of the reset body (6) is loosely fitted to the downstream end portion of the tubular portion (53), and the tip end of the shaft portion (61) and the valve shaft (33 ) And the tip end of () face each other at regular intervals. The reset body (6) is movably supported in the axial direction by the fitting of the shaft portion and the tubular portion (53), and is provided in the reset body (6) and stretched in the radial direction. The three support rods (62) (62) that were taken out were loosely fitted in the long hole formed in the downstream end of the main body (1) in the axial direction, and the reset body (6 ) Is restricted to a certain range.

A spring (40) for urging the reset body (6) to the downstream side is interposed between the support rods (62) (62) and the frame body (5). In the first embodiment, as shown in FIGS. 1 and 4, a plurality of ribs (R) (R) are radially arranged on the upper surface of the disk (7), that is, the end surface on the downstream side. This creates a slight gap between the disc (7) and the disc (7) that is in contact with the disc (7) by the spring (4). I try not to adhere to the whole surface. Therefore, this structure eliminates the inconvenience that the valve body (3) and the disc (7) are in close contact with each other due to the moisture and water contained in the gas flow path and the operation of the valve body (3) is hindered. .

Next, in the second embodiment shown in FIGS. 5 and 6, the sliding force of the valve shaft (31) and the frame body (51) causes sliding resistance in the valve body (3). The operation is delayed. In this embodiment, as shown in FIG. 4, the valve shaft (31) is provided with a large number of collar portions (32) (32) arranged in parallel in the axial direction at regular intervals. The outer diameter of (32) is set to be slightly smaller than the inner diameter of the through hole portion (52). Further, as shown in the figure, the disposition area of the collar portions (32) and (32) is set to the range on the tip side from the position apart from the upstream end surface of the valve body (3) by a certain distance. As shown in FIG. 3, when the valve body (3) is in the valve open state, the collar portions (32) (32) are located at the positions that have escaped from the through hole portion (52) to the upstream side. Then, the upstream end of the inner peripheral surface of the through hole portion (52) is a tapered surface that expands toward the upstream side, and the flange portion (32) (32) enters the through hole portion (52). It is easy to insert.

When this embodiment is inserted into the gas circuit, the moving force to the downstream side that acts on the valve body (3) becomes a certain level or more when the overflow state occurs, which causes the spring (4) to move. The valve body (3) is moved to the downstream side against the biasing force, and the gas circuit is shut off. At this time, the collar portion (32) (32) moves while the valve shaft (31) moves while colliding with the upstream end of the inner peripheral surface of the through hole portion (52), whereby a desired delay operation is obtained. .

Next, a third embodiment will be described. In the third embodiment, as shown in FIG. 7, the flange portions (32) (32) provided on the valve shaft (31) are eccentrically arranged side by side, and the other configuration is the same as the second embodiment. The configuration is similar to that of the above embodiment. In this embodiment, each collar portion (32) reliably collides with the end edge of the through hole portion (52), further improving the delay effect of the operation of the valve body (3).

In any of the above-mentioned embodiments, the reset body (6) is provided, and when incorporated in the gas cock, the head of the reset body (6) is a closure of the gas cock or By means of a means interlocking with this, a constant stroke is pushed by the closing rotation of the closure to the fully closed position, which causes the valve shaft (33) of the valve body (3) in the closed state. Is pushed for a certain stroke, and this valve body (3) is reset to the initial state. Therefore, in a state where the reset body (6) is not pushed in, as shown in FIG. 1, it is set so that a certain gap is generated between the tip of the valve shaft (33) and the tip of the support rod (62). It is set so that the valve shaft (33) is pushed in for a constant stroke from this state by pushing the reset body (6).

Further, each frame is formed by forming a through hole (52) or a tubular portion at an intersection of a plurality of crosspieces protruding in the radial direction from the inner wall of the main body (1). The gas passes through.

[Submission date] July 5, 1996

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

[0006]

[Means for Solving the Problems]

 The technical means of the present invention taken to solve the above-mentioned problem is "fixed at the center of a frame (51) provided on the upstream side of the valve body (3) and having a diameter substantially equal to that of the valve body (3). The discs (7) having the same diameter are provided at right angles to the flow path in the main body (1).

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

[0007]

[Action]

 The above technical means of the present invention operates as follows. Since the valve body (3) is biased to the upstream side by the spring (4), it is in contact with the frame body (51) located on the upstream side of the valve body (3) in the valve opening position. . Further, since the disc (7) substantially matching the diameter of the valve body (3) is fixed to the frame (51), the disc (7) is fixed in the direction of gas flow in the main body (1). 7) → Close the valve body (3) in this order and connect in series.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

In this state, when the gas flow rate in the main body increases and reaches the set flow rate, the valve body (3) moves downstream due to the gas flow generated on the downstream side of the disc (7). It is pressed and fits into the valve seat (20). That is, the overflow prevention valve has been activated. If the circuit on the downstream side of the main body (1) is suddenly opened to the normal opening, the flow rate will momentarily be the same as the overflow state, but the disc on the upstream side of the valve body (3) will be. Since (7) is located in close proximity to the valve body (3), most of the sudden pressure difference generated near the valve body (3) is received by the disc (7) fixed to the frame body (51). , It does not act directly on the valve body (3). Therefore, even if the flow rate state instantaneously becomes the same as the overflow state, the valve body (3) does not operate depending on this.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

Even if the upstream side of the valve body (3) momentarily becomes a negative pressure state or a low pressure state due to the pressure fluctuation caused by the rapid closing of the valve body (3) after the valve body (3) is closed, Since the disc (7) fixed to the frame body (51) is located on the upstream side, the pressure fluctuation is alleviated by this.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embodiment of the present invention in a valve open state (valve element inoperative state).

[Fig. 2] The plane part

FIG. 3 is a perspective view of a main part

FIG. 4 is a plan view of the main part

FIG. 5 is a sectional view of the second embodiment.

FIG. 6 is an explanatory view of a valve body (3) used for this.

FIG. 7 is a perspective view of a valve body (3) according to a third embodiment.

FIG. 8 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 (1) ・ ・ Main body (4) ・ ・ Spring (51) ・ ・ Frame (20) ・ ・ Valve seat (7) ・ ・ Disc (3) ・ ・ Valve (31) ・ ・ Valve shaft

[Procedure amendment]

[Submission date] July 5, 1996

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 1

[Correction method] Change

[Correction content]

Claims (1)

[Scope of utility model registration request] 1. A valve body (3) is arranged so as to face a valve seat (20) formed in a cylindrical main body (1) from its upstream side, and the valve body (3) is equipped with this valve body (3). The main body (1) is supported by a frame that extends from the inner peripheral surface of the valve shaft so as to be movable in the axial direction, and a spring (4) that biases the valve body (3) to the upstream side is provided. In order to fit the valve body (3) into the valve seat (20) in the overflow state, the size of the valve body (3) and the biasing force of the spring (4) are set to a predetermined value to prevent overflow. Valve, valve body
At the center of the frame body (51) provided on the upstream side of (3), a disc (7) with a diameter approximately matching the diameter of this valve body (3) is placed at a right angle to the flow path in the main body (1). Overflow prevention valve provided.