JP2007247787A - Exhaust valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust valve having great vacuum breaking capability for actualizing quick vacuum break. <P>SOLUTION: A valve chest 3 having an inflow port 4 opened at the lower part and a flow-out port 5 opened at the upper part is formed with a casing consisting of a body 1 and a cover 2. A valve seat 6 is formed between the valve chest 3 and the flow-out port 5. The body 1 has a plurality of integrated ribs 9 protruded inside to the inner wall of the valve chest 3, and a float receiver 10 is arranged inside the ribs 9 with an approximately cylindrical bottomed open hole 11 in the bottom for communicating the inside with the outside. A spherical float 12 is arranged in the float receiver 10 in a free condition. The float receiver 10 is arranged while being energized to the side of the outflow port 5 by a coil spring 13 as an elastic member. The float receiver 10 is displaced to the side of the outflow port 5 by the energizing force of the coil spring 13 when air or water flows from the inflow port 4 into the valve chest 3, and it is displaced to the side of the inflow port 4 against the coil spring 13 with the power of outside air flowing from the outflow port 5 into the valve chest 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention opens the valve when water is fed into the pipe, exhausts the air in the pipe, closes when the exhaust is finished, and opens when the pressure in the piping system drops to a vacuum state. The present invention relates to an exhaust valve that breaks a vacuum state by introducing external air.

  A conventional exhaust valve forms a valve chamber with an inlet opening at the bottom and an outlet opening at the top of the casing, forming a valve seat between the valve chamber and the outlet, and projecting inward to the valve chamber wall. A float receiver is formed in which a rib is formed, and a bottom having a substantially cylindrical shape with a bottom and a through hole communicating with the inside and the outside is fixed to the inside of the rib, and the float is arranged in a free state in the float receiver. This exhaust valve is in an open state in which when the water is first fed into the pipe, the float is separated from the valve seat and descends, and the air in the pipe flowing into the valve chamber from the inlet is drawn from the space between the ribs. Exhaust through the upper end of the float receiver and through the inside of the float receiver to the outlet. Then, when the exhaust is finished and the water in the pipe flows into the valve chamber from the inlet, the float floats by the water flowing into the float receiver from the space between the ribs through the float receiver upper end and through the through hole. Sit on the seat and close the valve. In addition, when the pressure in the piping system drops to a vacuum state, the float moves away from the valve seat and descends, and external air flowing into the valve chamber from the outlet is passed through the through hole and through the float receiver. The vacuum state is broken by introducing into the pipe from the inlet through the space between the upper end and the rib.

In the conventional exhaust valve, when the vacuum state is broken, the float does not drop sufficiently, and the valve is half open, or the on-off valve is repeated little by little, so the vacuum breaking ability is small and it takes time to break the vacuum. There was a problem. This is because most of the outside air flowing into the valve chamber from the outlet exits straight into the float receiver and hits the bottom of the float receiver and bounces off, so that the float is lifted. Further, since the outside air that has entered the float receiver cannot pass through the through hole, the pressure below the float in the float receiver rises and the float rises.
Japanese Utility Model Publication No. 53-1622

  Therefore, the technical problem of the present invention is to provide an exhaust valve that has a large vacuum breaking ability and can be quickly broken.

  The technical means of the present invention taken in order to solve the above technical problem is to form a valve chamber having an inflow opening in the lower part and an outflow opening in the upper part in the casing, and between the valve chamber and the outflow opening. A valve seat is formed, a rib that protrudes inward is formed on the inner wall of the valve chamber, and a float receiver that has a bottomed, almost cylindrical shape with a through hole that communicates the inside and outside is arranged inside the rib. The float receiver is urged to the outlet side by an elastic member and is arranged against the elastic member by the force of external air flowing into the valve chamber from the outlet port. Displacement to the inflow port side is a feature.

  In the present invention, the float receiver is urged toward the outlet side by an elastic member, and the float receiver is displaced toward the inlet side against the elastic member by the force of external air flowing into the valve chamber from the outlet. As a result, even if the float is lifted, a sufficient flow path can be secured between the float and the valve seat, and an excellent effect can be obtained that the vacuum breaking ability is large and the vacuum can be broken quickly.

  In the present invention, the float receiver urged and arranged on the outlet side by the elastic member is displaced toward the inlet side against the elastic member by the force of the external air flowing into the valve chamber from the outlet. Therefore, a sufficient flow path can be ensured between the float and the valve seat even when the float is lifted by the external air that bounces off the bottom of the float receiver or by a pressure increase below the float in the float receiver. Therefore, the vacuum breaking ability is large and can be quickly broken.

  An embodiment showing a specific example of the above technical means will be described (see FIG. 1). A lid 2 is fastened to the main body 1 with a bolt to form a casing having a valve chamber 3 therein. An inlet 4 is formed in the lower part of the main body 1, and an outlet 5 is formed in the upper part of the lid 2. The attachment member 7 is fixed with screws with the valve seat 6 interposed between the lid 2 and the valve seat 6.

  The main body 1 integrally has a plurality of ribs 9 protruding inwardly on the inner wall of the valve chamber 3, and a bottomed substantially cylindrical float receiver 10 is disposed inside the ribs 9. The float receiver 10 has a through hole 11 having a small opening area communicating with the inside and the outside at the bottom. The float receiver 10 is urged toward the outlet 5 side by a coil spring 13 as an elastic member disposed between the lower portion of the float receiver 10 and the bottom wall of the valve chamber 3, and the upper end is disposed by being locked by a snap ring 15. .

  The float receiver 10 is urged toward the outlet 5 by the urging force of the coil spring 13 when air or water flows into the valve chamber 3 from the inlet 4 and is locked by the snap ring 15. The external air flowing into the valve chamber 3 from the outlet 5 is displaced toward the inlet 4 against the coil spring 13 and is locked by the step portion 14 of the rib 9. A spherical float 12 is placed in a free state in the float receiver 10.

  The operation of the exhaust valve of the above embodiment is as follows. First, when water is fed into the pipe, the float receiver 10 is urged toward the outlet 5 by the urging force of the coil spring 13 and is locked by the snap ring 15, and the float 12 moves away from the valve seat 6 and descends. The valve is open on the bottom wall. Thereby, the air in the pipe flowing into the valve chamber 3 is exhausted from the space between the ribs 9 through the upper end of the float receiver 10 and through the through hole 11 into the outlet 5 to the outlet 5.

  When the exhaust is finished and water in the pipe flows into the valve chamber 3 from the inlet 4, the float 12 enters the float receiver 10 from the space between the ribs 9 through the upper end of the float receiver 10 and through the through hole 11. It floats by the inflowing water, sits on the valve seat 6 and closes. This prevents leakage of water. When the pressure in the piping system is reduced to a vacuum state, the float 12 is separated from the valve seat 6 and descends, and the valve 12 is placed on the bottom wall of the float receiver 10. Thus, the external air flowing into the valve chamber 3 is introduced into the pipe through the space between the rib receiver 9 from the upper end of the float receiver 10 and from the inlet 4 into the pipe through the through hole 11 from the float receiver 10. Destroy. At this time, the float receiver 10 is displaced toward the inlet 4 against the coil spring 13 by the momentum of the external air flowing into the valve chamber 3 from the outlet 5 and is locked by the step portion 14 of the rib 9. Therefore, even if the float 12 rises due to external air that bounces off the bottom of the float receiver 10 or due to an increase in pressure below the float 12 in the float receiver 10, a sufficient flow path is secured between the float 12 and the valve seat 6. it can.

Sectional drawing of the exhaust valve of the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Lid 3 Valve chamber 4 Inlet 5 Outlet 6 Valve seat 9 Rib 10 Float receptacle 11 Through-hole 12 Float 13 Coil spring

Claims (1)

In the casing, a valve chamber is formed with an inlet opening at the bottom and an outlet opening at the top, a valve seat is formed between the valve chamber and the outlet, and a rib protruding inward is formed on the valve chamber wall. A float receiver with an almost cylindrical shape with a bottom and a through hole communicating inside and outside is arranged on the inside of the float, and the float receiver is arranged in a free state in the float receiver. An exhaust valve characterized in that the float receiver is displaced toward the inlet side against the elastic member by the momentum of the external air flowing into the valve chamber from the outlet port.

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