CN101994858B - Air valve for preventing water hammer due to cavities collapsing - Google Patents

Abstract

The invention relates to an air valve, in particular to an air valve for preventing water hammer due to cavities collapsing, which solves the problems that since the traditional air valve has insufficient air inflow, water hammer due to cavities collapsing can be caused easily. A floating ball supporting plate is connected with the inner wall of the valve body, a through hole is arranged on the floating ball supporting plate, a floating ball supporting rod is inserted in the through hole, a floating ball is fixedly installed at the upper end of the floating ball supporting rod corresponding to a first valve port, and the floating ball is used for controlling the opening and closing of the first valve port; a spring supporting plate is fixedly connected with the inner wall of the valve body, the lower end of a spring guiding rod is fixedly connected with the spring supporting plate, and the upper end of the spring guiding rod is fixedly installed on a second valve port; and a blocking disc is sheathed on the spring guiding rod and corresponds to the second valve port, the upper end of a spring is fixedly connected with the blocking disc, the lower end of the spring is fixedly connected with the spring supporting plate, the spring is sheathed on the spring guiding rod and used for controlling the up-and-down motion of the blocking disc, and the blocking disc is used for controlling the opening and closing of the second valve port. The air valve for preventing water hammer due to cavities collapsing is especially suitable for long-distance waterlines.

Description

Achieving a large amount of air intake and a limited amount of exhaust to prevent cut-off bridging water hammer air valve

technical field

The invention relates to an air valve, in particular to an air valve for preventing flow interruption and bridging water hammer that realizes a large amount of air intake and limited exhaust, and belongs to the technical field of water pipeline protection equipment.

Background technique

In long-distance water transmission projects, under certain operating conditions, such as pipeline water filling, emergency maintenance and emptying, normal and abnormal opening and closing of valves, normal and accidental start and stop of pumps, etc., there will often be local high points in the pipeline. A large amount of air or air bags, if not removed as soon as possible, will increase pipeline resistance and even cause water hammer burst and equipment damage accidents. Through the water hammer simulation calculation, it is determined that at the local high point of the pipeline, it is necessary to set up a large amount of air intake, and at the same time, a limited amount of exhaust equipment is required to prevent the flow from breaking and bridging the water hammer. The traditional air valve has only one valve port for intake and exhaust. If the intake volume is to be ensured, the exhaust volume will be too large, which will cause a flow break to bridge the water hammer; if the exhaust volume is to be controlled, the intake volume will also be limited. It cannot meet the requirements of the air intake volume at the local high point of the energy pipeline.

Contents of the invention

The purpose of the present invention is to solve the problem that the existing air valve has insufficient air intake, the exhaust volume cannot be controlled, a large amount of air intake and limited exhaust can not be realized, and the local high point of the pipeline is prone to flow interruption to bridge the water hammer, and then provide A water hammer prevention air valve that realizes a large amount of air intake and a limited amount of exhaust air.

The technical solution of the present invention is: the air valve for preventing flow interruption and bridging water hammer to realize a large amount of air intake and limited exhaust includes a valve body, a first valve cover, a floating ball, a floating ball supporting plate, a floating ball supporting rod, and a second valve cover , blocking plate, spring, spring guide rod and spring support plate, the upper end of the valve body is provided with a first valve port and a second valve port, the first valve cover is installed on the first valve port, the second valve cover is installed On the second valve port, the floating ball supporting plate is fixedly connected with the inner wall of the valve body, and a through hole is opened on the floating ball supporting plate, and the floating ball supporting rod is inserted into the through hole, and the floating ball supporting rod Sliding in the hole, the upper end of the floating ball support rod is fixed with a floating ball, and the installation position of the floating ball corresponds to the first valve port. The floating ball is used to control the opening and closing of the first valve port. The spring support plate and the valve The inner wall of the body is fixedly connected, the lower end of the spring guide rod is fixedly connected with the spring support plate, the upper end of the spring guide rod is fixedly installed on the second valve cover, the plug is set on the spring guide rod, and the installation position of the plug is the same as that of the second valve cover. The two valve ports are corresponding, and the blocking plate slides on the spring guide rod, the spring is set on the spring guiding rod, and the upper end of the spring is fixedly connected with the blocking plate, and the lower end of the spring is fixedly connected with the spring support plate, and the spring is used to control the blocking plate The up and down movement of the plug is used to control the opening and closing of the second valve port.

Compared with the prior art, the present invention has the following effects: the air valve of the present invention, which realizes a large amount of air intake and limited exhaust, can control the air intake and exhaust volume through the automatic opening and closing of the valve port, and realizes a large amount of air intake. Air and limited exhaust prevent the generation of water hammer due to flow breakage; the invention also has the advantages of easy installation and use, easy maintenance and management, and low cost.

Description of drawings

Fig. 1 is the schematic diagram of overall structure of the present invention, and Fig. 2 is the A-A sectional view of Fig. 1, and Fig. 3 is the B-B sectional view of Fig. 1, and Fig. 4 is the partial enlarged view of C place of Fig. 2, and Fig. 5 is the top view of Fig. 1 .

Detailed ways

Specific Embodiment 1: This embodiment is described in conjunction with Fig. 1-Fig. 3 and Fig. 5. The air valve of this embodiment, which realizes a large amount of air intake and limited exhaust, prevents flow interruption and bridges water hammer, and includes a valve body 10 and a first valve cover 1 , floating ball 4, floating ball supporting plate 5, floating ball supporting rod 6, second bonnet 7, plug plate 11, spring 12, spring guide rod 13 and spring supporting plate 14, the upper end of described valve body 10 is provided with the first One valve port 3 and the second valve port 9, the first valve cover 1 cover is installed on the first valve port 3, the second valve cover 7 cover is installed on the second valve port 9, the floating ball supporting plate 5 and the valve The inner wall of body 10 is fixedly connected, and there is a via hole 5-1 on the float support plate 5, and the float support rod 6 is inserted in the via hole 5-1, and the float support rod 6 is inserted into the via hole 5-1. The upper end of the floating ball support rod 6 is fixedly installed with a floating ball 4, and the installation position of the floating ball 4 corresponds to the first valve port 3, and the floating ball 4 is used to control the opening and closing of the first valve port 3. The spring supporting plate 14 is fixedly connected with the inner wall of the valve body 10, the lower end of the spring guiding rod 13 is fixedly connected with the spring supporting plate 14, the upper end of the spring guiding rod 13 is fixedly installed on the second valve cover 7, and the blocking plate 11 is sleeved on the On the spring guide rod 13, the installation position of the blocking disc 11 corresponds to the second valve port 9, and the blocking disc 11 slides on the spring guide rod 13, the spring 12 is sleeved on the spring guide rod 13, and the upper end of the spring 12 is in contact with the plug The disk 11 is fixedly connected, the lower end of the spring 12 is fixedly connected with the spring support plate 14, the spring 12 is used to control the up and down movement of the blocking disk 11, and the blocking disk 11 is used to control the opening and closing of the second valve port 9.

Specific embodiment two: This embodiment is described in conjunction with FIG. 1. The air valve of this embodiment also includes a first filter screen 2 and a second filter screen 8. The first filter screen 2 is fixedly installed on the first valve cover 1 and the first valve cover. Between the ports 3, the second filter screen 8 is fixedly installed between the second valve cover 7 and the second valve port 9. With such setting, the gas is filtered to prevent sundries from entering the air valve. Other compositions and connections are the same as in the first embodiment.

Specific Embodiment Three: This embodiment is described with reference to FIGS. 1-3 . The first filter screen 2 and the second filter screen 8 in this embodiment are both stainless steel filter screens. Such setting can prolong the service life of the filter screen. Other compositions and connections are the same as those in the second embodiment.

Embodiment 4: This embodiment is described with reference to FIG. 4 . The air valve of this embodiment further includes a sealing ring 15 , and the sealing ring 15 is fixedly installed on the inner wall of the lower end of the first valve port 3 . Such arrangement can more effectively control the ingress and egress of gas. Other compositions and connections are the same as those in Embodiment 1, 2 or 3.

The working principle of the present invention (see Fig. 1-Fig. 3): the air valve of the present invention is installed at the local high point of the pipeline. When there is gas in the pipeline system, the gas will eventually gather at the local high point of the pipeline. When the gas enters the valve body 10 and gathers in the valve body 10, as the gas in the valve body 10 increases, the gas will cause the water level in the valve body 10 to drop, and the float 4 will drop to the float tray 5 along with the water level, and open The first valve port 3 discharges the gas; when the gas is exhausted, the water level rises, and the float 4 rises together with the water level to close the first valve port 3 . When there is a negative pressure in the pipeline system, the system pressure is lower than the external atmospheric pressure, the water level in the valve body 10 drops, the float 4 drops to the float tray 5 along with the water level, the first valve port 3 is opened, and the external atmospheric pressure pushes the plug 11 is lowered, the spring 12 is compressed, the second valve port 9 is opened, and the gas enters the valve body 10 from the first valve port 3 and the second valve port 9, supplies gas to the pipeline, and balances the pressure in the pipeline system; After the negative pressure disappears, the pressure of the pipeline system is greater than the external atmospheric pressure, the water level in the valve body 10 rises, the floating ball 4 rises together with the water level, closes the first valve port 3, and at the same time the compressed spring 12 returns to its original state, and the blocking plate 11 rises to block the valve. The second valve port 9.

Claims (4)

1. A kind of air valve that prevents cut-off bridging water hammer that realizes a large amount of air intake and limited exhaust, it comprises valve body (10), first valve cover (1), second valve cover (7), described valve body The upper end of (10) is provided with the first valve port (3) and the second valve port (9), and the first valve cover (1) cover is installed on the first valve port (3), and the second valve cover (7) covers Installed on the second valve port (9), it is characterized in that: the air valve also includes a float (4), a float support (5), a float support (6), a plug (11), a spring (12 ), a spring guide rod (13) and a spring supporting plate (14), the floating ball supporting plate (5) is fixedly connected with the inner wall of the valve body (10), and the floating ball supporting plate (5) has a through hole (5 -1), the float support rod (6) is inserted in the through hole (5-1), and the float support rod (6) slides in the through hole (5-1), and the float support rod (6) ) is fixedly installed with a floating ball (4), and the installation position of the floating ball (4) corresponds to the first valve port (3), and the floating ball (4) is used to control the opening and closing of the first valve port (3) , the spring support plate (14) is fixedly connected with the inner wall of the valve body (10), the lower end of the spring guide rod (13) is fixedly connected with the spring support plate (14), and the upper end of the spring guide rod (13) is fixedly installed On the second bonnet (7), the blocking plate (11) is set on the spring guide rod (13), the installation position of the blocking plate (11) corresponds to the second valve port (9), and the blocking plate (11) Slide on the spring guide rod (13), the spring (12) is sleeved on the spring guide rod (13), and the upper end of the spring (12) is fixedly connected with the blocking plate (11), and the lower end of the spring (12) is connected with the spring supporting plate (14) is fixedly connected, and the spring (12) is used to control the up and down movement of the blocking plate (11), and the blocking plate (11) is used to control the opening and closing of the second valve port (9). 2. The air valve for preventing flow interruption and bridging water hammer for realizing a large amount of air intake and limited exhaust according to claim 1, characterized in that: the air valve also includes a first filter screen (2) and a second filter screen ( 8), the first filter screen (2) is fixedly installed between the first valve cover (1) and the first valve port (3), and the second filter screen (8) is fixedly installed between the second valve cover (7) and the first valve port (3). Between the two valve ports (9). 3. The air valve for preventing flow interruption and bridging water hammer that realizes a large amount of air intake and limited exhaust according to claim 2, characterized in that: the first filter screen (2) and the second filter screen (8) are stainless steel filters net. 4. According to claim 1, 2 or 3, the air valve for preventing flow interruption and bridging water hammer to realize a large amount of air intake and limited exhaust, is characterized in that: the air valve also includes a sealing ring (15), and the sealing ring ( 15) fixedly installed on the inner wall of the lower end of the first valve port (3). the

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