JPH0712668U - Automatic air vent valve device - Google Patents

Abstract

(57) [Summary] [Object] To provide an automatic air vent valve device which does not allow outside air to enter the inside of a liquid supply system, a liquid circulation system, or the like when the inside becomes negative pressure. [Structure] A float type exhaust valve 21 arranged in a casing 11 having a connection port (lower) 12 and an exhaust port (upper) 15 is attached to the exhaust port 15, and the outside air from the exhaust port 15 into the casing 11 is exposed. Check valve 4 to prevent intrusion
1 is disposed above the exhaust valve 21 and is attached to the exhaust port 15. [Effect] In addition to the harmful air that has entered the system being automatically exhausted by the float type exhaust valve 21, when the system is in a negative pressure state, the check valve 41 prevents the ingress of outside air.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an air vent valve device used in a water supply system, a hot water supply system, an air conditioning system, etc. to automatically remove air accumulated therein.

[0002]

[Prior art]

 When operating a water supply system, hot water supply system, air conditioning system, etc., air inevitably enters these systems. Such air is a cause of corrosion, vibration and noise of components, pumps, valves and pipes that are components of each system, and causes of air lock of pumps, wear of bearings and reduction of thermal efficiency of heat exchangers. Therefore, it is necessary to remove it as soon as possible. For that reason, each system described above is equipped with an automatic air vent valve device in the upper part of the liquid storage tank, high-place piping, etc.

As an automatic air bleeding valve device of this type, a float type exhaust valve is installed inside a casing having an upper exhaust port and a lower pipe connection port, and the exhaust valve is attached to an inner end of the exhaust port. What has been done is widely known.

In the case of such an automatic air vent valve device, air flows into a relatively high-level casing from a relatively low-level device or pipe, and the liquid level in the casing that receives air pressure at this time When the level drops to a predetermined level, that is, when the float descends to a predetermined position, the exhaust valve is opened and the air in the casing is exhausted to the outside through the exhaust port. In the automatic air vent valve device after exhaust, the liquid flowing into the casing from the connection port raises the liquid level in the casing, and the float rises accordingly, so the exhaust valve is closed and the exhaust port is closed.

[0005]

[Problems to be solved by the device]

 The above-mentioned automatic air vent valve device maintains a normal state without malfunction of the float and the exhaust valve when the inside of the equipment and piping is at a positive pressure, but the following conditions can be applied to the water supply system, hot water supply system, cooling and heating system, etc. When trouble occurs, it cannot be dealt with. For example, in a water supply system, when the water level in the casing becomes negative due to water cutoff or a large amount of water supply, and the water level in the casing drops accordingly, the float will drop, the exhaust valve will open, etc. As a series of malfunctions occur, outside air enters the casing through the exhaust port and enters the inside of equipment and piping. When such troubles are repeated, the outside air becomes mixed with the liquid flowing inside each of the equipment and piping as air bubbles, which makes it difficult to eliminate them, which causes the above-mentioned harmful situation. Become.

[Object of the Invention] In view of such a technical problem, the present invention is designed so that even if the inside of the hot water or other liquid supply system and / or the liquid circulation system becomes negative pressure, these internal It is intended to provide an automatic air vent valve device that does not allow outside air to enter the inside.

[0007]

[Means for Solving the Problems]

 In order to achieve the intended purpose of the present invention, a float type exhaust valve is arranged in a casing having a connection port for piping in the lower part and an exhaust port in the upper part, and the exhaust valve serves as the exhaust port. In the installed automatic air bleeding valve device, a check valve for preventing outside air from entering the casing from the exhaust port is arranged above the exhaust valve and assembled to the exhaust port. .

As a desirable mode of the automatic air bleeding valve device according to the present invention, an operating rod for separating the valve body of the check valve from its valve seat is provided with a holding hole formed in the outer wall of the check valve. When the valve device is inserted inside and is held so as to be movable from the outside of the check valve toward the valve body side, the valve device can also be used as a vacuum break valve.

[0009]

[Action]

 The automatic air vent valve device according to the present invention is attached to a predetermined part of a liquid circulation system, a liquid supply system, etc., for example, an upper part of a liquid storage tank or a pipe at a high place through a connection port for piping at the bottom of the device. To be done.

In the above, air flows into the casing of a relatively high level from the inside of the device of a relatively low level and the piping, and the liquid level in the casing that receives the air pressure at this time drops to a predetermined level. At this time, since the float descends to a predetermined position, the exhaust valve is opened and the air in the casing is exhausted to the outside through the exhaust port. At this time, since the check valve attached to the exhaust port is freely opened in the exhaust direction, the air in the casing that goes to the outside easily passes through the exhaust port. After the exhaust, the liquid flowing from the connection port into the casing raises the liquid level in the casing, and the float rises accordingly, so the exhaust valve is closed and the exhaust port is closed.

In a system provided with an automatic air bleeding valve device according to the present invention, for example, in a water supply system, when a negative pressure is generated in a device or a pipe due to water cutoff or a large amount of water supply, a connection for piping is provided. As the inside of the casing is sucked through the mouth, lowering of the water level inside the casing, float lowering, opening of the exhaust valve, etc. occur in a chain, and it is as if outside air enters the casing through the exhaust port. When such a suction force is generated, the check valve maintains the closed state, so that the outside air is prevented from entering the casing through the exhaust port. Therefore, even if the liquid circulation system, the liquid supply system, etc. have a negative pressure due to an unexpected trouble, air bubbles are not mixed in these.

When the liquid circulation system or the liquid supply system has a negative pressure, water must be drained from these pipes, for example, when attempting maintenance or inspection of the system or antifreezing measures. However, when the system is in a negative pressure state (vacuum state), it is necessary to break the system in vacuum before draining water. By the way, the check valve in the negative pressure state is in a stronger closed state than in the positive pressure state because the valve body of this valve receives the above-mentioned suction force and strongly adheres to the valve seat. . In such a case, if the check valve is provided with an operation rod for separating the valve body from the valve seat, the system can be vacuum-disrupted by utilizing this. That is, the check valve can be opened by pushing the operating rod in a predetermined direction to disengage the valve body from the valve seat, and the vacuum of the system is broken by opening the valve.

[0013]

【Example】

 An embodiment of an automatic air bleeding valve device according to the present invention will be described with reference to the drawings. The automatic air vent valve device illustrated in FIG. 1 is a combination of a casing 11, a float type exhaust valve 21, and a check valve 41.

The casing 11 is composed of a container-shaped body 14 having a pipe connection port 12 at a lower portion and a flange 13 at an upper end, an exhaust port 15 at a flat portion, and a lid-shaped cover 17 having a flange 16 at a lower end. . The body 14 and the cover 17 for forming the casing 11 are configured such that flanges 13 and 16 forming a pair are butted against each other with a sealing material interposed therebetween, and well-known fasteners such as bolts and nuts. Are connected to each other.

In the case of the float type exhaust valve 21, a cylindrical body 23 having a ventilation hole 22 in an intermediate portion in the lengthwise direction, a stopper ring 24 installed inside the cylindrical body 23 from an upper portion to a lower portion, a ring-shaped valve seat 25, a pointed valve body 26, a rod-shaped lifting member 27, a float 29 having a lever 28, and a suspender 31 having a mounting member 30 are main members. The valve seat 25, the valve body 26, and the tubular body 23 are made to have specifications that can maintain the airtightness of the portions in contact with each other. The valve body 26 and the elevating member 27 have a lower end (recess) of the valve body 26 and an upper end (convex) of the elevating member 27 connected by a press-fitting fitting means, and the lower side of the elevating member 27 is a cylinder. The lower end of the body 23 projects outside the tubular body 23. The base of the lever 28 of the float 29 is pivotally attached to the lower part of the hanger 31 via a shaft pin 32, and the hanger 31 is attached to the outer periphery of the cylindrical body 23 via a mounting member 30 of the hanger 31. There is. Further, the base portion of the lever 28 of the float 29 and the lower portion of the elevating member 27 protruding to the outside of the cylindrical body 23 are pivotally connected to each other via a shaft pin 33. The float type exhaust valve 21 thus assembled is arranged in the casing 11, and the cylindrical body 23 of the float type exhaust valve 21 is screwed into the exhaust port 15 on the cover 17 side so that the inner end of the exhaust port 15 is closed. Is attached to.

In the case of the check valve 41, a lower cylindrical body 43 having a holding hole (screw hole) 42 in a peripheral wall forming an outer shell, and a ring-shaped valve seat 44 fixed to a step portion in the lower cylindrical body 43. A ball-shaped valve element 45 arranged on the valve seat 44 in the lower cylinder 43, and an operating rod (screw rod having a head) 46 screwed into the holding hole 42 of the lower cylinder 43. And an upper cylinder 48 having a stopper ring 47 built therein, and the upper end of the lower cylinder 43 and the lower end of the upper cylinder 48 are connected to each other via screw fitting means. The inner diameters of the valve seat 44 and the stopper ring 47 are smaller than the outer diameter of the valve body 45, as is obvious. Further, the tip of the operating rod 46 held via the holding hole 42 of the lower tubular body 43 is opposed to the valve element 45 in the lower tubular body 43, and the operating rod 46 is moved into the lower tubular body 43. By twisting, the valve element 45 can be pushed away from the valve seat 44 by its tip.

In each of the parts constituting the automatic air bleeding valve device according to the present invention, the valve seat 25, the valve body 26, the float 29, the valve seat 44, the stopper ring 47, etc. are made of rubber or synthetic resin. Other parts except for are made of metal, but part of the metal parts may be replaced with synthetic resin parts, or part of the synthetic resin parts may be replaced with metal parts as necessary.

The automatic air bleeding valve device according to the present invention is used by being installed in predetermined equipment and pipes in a water supply system, a hot water supply system, a liquid supply system such as an air conditioning system, a liquid circulation system, and the like. More specifically, the device is attached to the upper part of the liquid storage tank included in the system, the high-place piping, etc. via the piping connection port 12.

The automatic air bleeding valve device according to the present invention eliminates air as described below when the air existing in the above system naturally increases. The air flowing through the above system naturally enters the casing 11 because the automatic air vent valve device is set at a high position in the system, and the liquid in the casing 11 relatively moves from this to the casing 11 through the connection port 12. As it goes out, the liquid level in the casing 11 drops and the float 29 also drops. When the float 29 descends, the valve body 26 descends inside the cylindrical body 23 via the lever 28 and the elevating / lowering member 27 which are in a slidable relationship with the float 29, so that the vent hole 22 and the valve seat 25 of the cylindrical body 23 are simultaneously opened. It Therefore, the air that has entered the casing 11 passes through the ventilation hole 22, the valve seat 25 in the cylindrical body 23, and the stopper ring 24 in the float type exhaust valve 21, reaches the check valve 41, and In the stop valve 41, it passes through the valve seat 44 in the lower cylinder body 43 and the inside of the upper cylinder body 48 and exits to the outside (the valve body 45 of the check valve 41 is discharged by the exhaust flow at this time). Free from).

After such exhaust, the amount of air in the casing 11 decreases, and the liquid flows from the connection port 12 into the casing 11, so that the liquid level in the casing 11 rises and the float 29 also rises. The float type exhaust valve 21 is closed by the operation opposite to the above.

When the above system has a negative pressure due to an unexpected cause, the inside of the casing 11 is sucked through the connection port 12, so that the liquid level in the casing 11 is lowered, the float 29 is lowered, and the float type exhaust gas is discharged. Opening of the valve 21 and the like occur in series, and the outside air tries to enter the casing 11 through the exhaust port 15. However, when such a suction force is generated, the valve body 45 of the check valve 41, which receives the suction force, closely adheres to the valve seat 44 and maintains the closed state, so that the invasion of outside air is prevented. .

When the above system is in a negative pressure state, the float type exhaust valve 21 is open, but in the case of the check valve 41, the valve body 45 of the check valve 41 is adsorbed to the valve seat 44. Closed. In this state, if the system is to be broken in vacuum as necessary, the operating rod 46 is screwed into the lower cylindrical body 43, and the valve body 45 is disengaged from the valve seat 44 at the tip of the operating rod 46, and the check valve is opened. 41 is opened. That is, opening the check valve 41 while the float type exhaust valve 21 is open allows the system to communicate with the atmosphere, so that the system is broken in vacuum.

In the case of the automatic air bleeding valve device according to the present invention, the operating rod 46 and its related components may be omitted. Even in such an embodiment, it is possible to prevent the outside air from entering the above-mentioned system, so that the intended purpose can be achieved.

[0024]

[Effect of device]

 The automatic air vent valve device according to the present invention, when it is used by being set in a predetermined part of a hot water or other liquid supply system and / or a liquid circulation system, the harmful air invading the system is floated. Not only can the air be exhausted automatically by the exhaust valve, but also when the system is under negative pressure, the ingress of outside air can be prevented through the check valve. Therefore, it is possible to operate the system stably, quietly and efficiently while avoiding the shortening of the system life due to air.

In the automatic air bleeding valve device according to the present invention, when the check valve is equipped with the operation rod for detaching the valve body of the check valve from its valve seat, the system in the negative pressure state is If necessary, the operation for breaking the vacuum can be easily performed via the operating rod, which increases convenience.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of an automatic air bleeding valve device according to the present invention.

[Explanation of symbols]

 11 Casing 12 Connection Port for Piping 14 Body 15 Exhaust Port 17 Cover 21 Float Type Exhaust Valve 22 Exhaust Valve Vent Hole 23 Exhaust Valve Cylinder 25 Exhaust Valve Valve Seat 26 Exhaust Valve Valve Body 28 Float Lever 29 Float 41 Check valve 42 Holding hole 43 Lower cylinder body (outer shell wall) 44 Check valve valve seat 45 Check valve valve body 46 Operation rod 47 Stopper ring 48 Upper cylinder body

Claims (2)

[Scope of utility model registration request] 1. An automatic air bleeding valve device in which a float type exhaust valve is arranged in a casing having a pipe connection port in the lower part and an exhaust port in the upper part, and the exhaust valve is attached to the exhaust port. An automatic air vent valve device, wherein a check valve for preventing outside air from entering the casing through the exhaust port is arranged above the exhaust valve and assembled to the exhaust port. 2. An operating rod for detaching a valve body of a check valve from its valve seat is inserted into a holding hole formed in an outer shell wall of the check valve, so that the valve can be operated from outside the check valve. The automatic air bleeding valve device according to claim 1, which is held so as to be movable toward the body side.