CN101994858A - Air valve for preventing water hammer due to cavities collapsing - Google Patents

Abstract

The utility model relates to an air valve for preventing cut-off and bridging water hammer, which relates to an air valve. The invention solves the problem that the existing air valve has insufficient air intake and is prone to flow interruption and bridging water hammer. The floating ball supporting plate of the present invention is connected with the inner wall of the valve body. There is a through hole on the floating ball supporting plate, and the floating ball supporting rod is inserted into the through hole. The installation position 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 is fixedly connected with the inner wall of the valve body. The lower end of the spring guide rod is fixedly connected with the spring support plate. The upper end is fixedly installed on the second bonnet, the plug is set on the spring guide rod, the installation position of the plug corresponds to the second valve port, the upper end of the spring is fixedly connected with the plug, and the lower end of the spring is fixedly connected with the spring support plate , the spring is set on the spring guide rod, the spring is used to control the up and down movement of the blocking plate, and the blocking plate is used to control the opening and closing of the second valve port. The invention is especially suitable for long-distance water pipelines.

Description

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, 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 and is prone to produce cut-off bridging water hammer, and further provides an air valve for preventing cut-off bridging water hammer.

The technical solution of the present invention is: the air valve for preventing flow interruption and bridging water hammer includes a valve body, a first valve cover, a floating ball, a floating ball support plate, a floating ball support rod, a second valve cover, a blocking plate, a spring, and a spring guide rod and a 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 The ball supporting plate is fixedly connected with the inner wall of the valve body. There is a through hole on the floating ball supporting plate. The floating ball supporting rod is inserted into the through hole, and the floating ball supporting rod slides in the through hole. The upper end is fixedly installed 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 is fixedly connected with the inner wall of the valve body. The lower end of the 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, the installation position of the plug corresponds to the second valve port, and the plug Slide on the spring guide rod, the spring is set on the spring guide 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, the spring is used to control the up and down movement of the blocking plate, and the blocking plate is used to control Opening and closing of the second valve port.

Compared with the prior art, the present invention has the following effects: the air valve for preventing flow interruption and bridging water hammer of the present invention controls the intake and exhaust volume through the automatic opening and closing of the valve port, realizes a large amount of intake air and limited exhaust, and prevents interruption The flow bridges the generation of water hammer; the present 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 for preventing flow breakage and bridging water hammer in this embodiment includes a valve body 10, a first valve cover 1, a floating ball 4, and a floating ball supporting plate 5. Float support rod 6, second bonnet 7, blocking plate 11, spring 12, spring guide rod 13 and spring support plate 14, the upper end of the valve body 10 is provided with a first valve port 3 and a second valve port 9. The first valve cover 1 is installed on the first valve port 3, the second valve cover 7 is installed on the second valve port 9, the floating ball support plate 5 is fixedly connected with the inner wall of the valve body 10, and the floating ball There is a via hole 5-1 on the supporting plate 5, and the floating ball support rod 6 is inserted in the via hole 5-1, and the floating ball support rod 6 slides in the via hole 5-1, and the floating ball support rod 6 The upper end is fixedly installed with a floating ball 4, and the installation position of the floating ball 4 corresponds to the first valve port 3. The floating ball 4 is used to control the opening and closing of the first valve port 3. The inner wall is fixedly connected, the lower end of the spring guide rod 13 is fixedly connected with the spring supporting plate 14, the upper end of the spring guide rod 13 is fixedly installed on the second valve cover 7, the blocking plate 11 is sleeved on the spring guiding rod 13, and the blocking plate 11 The installation position corresponds to the second valve port 9, and the blocking plate 11 slides on the spring guide rod 13, the spring 12 is set 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 Fixedly connected with the spring support plate 14, 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.

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. An air valve for preventing flow interruption and bridging water hammer, which includes a valve body (10), is characterized in that: the air valve also includes a first valve cover (1), a floating ball (4), and a floating ball supporting plate (5) , float support rod (6), second bonnet (7), blocking plate (11), spring (12), spring guide rod (13) and spring support plate (14), the valve body (10) The upper end is provided with a first valve port (3) and a second valve port (9). The first valve cover (1) is installed on the first valve port (3), and the second valve cover (7) is installed on the second valve port. On the valve port (9), 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), and the floating ball supporting plate (5) The rod (6) is inserted in the through hole (5-1), and the floating ball supporting rod (6) slides in the through hole (5-1), and the upper end of the floating ball supporting 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), the floating ball (4) is used to control the opening and closing of the first valve port (3), and the spring support plate (14) It 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 valve cover (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) slides on the spring guide rod (13) , the spring (12) is set on the spring guide rod (13), and the upper end of the spring (12) is fixedly connected with the blocking plate (11), the lower end of the spring (12) is fixedly connected with the spring support plate (14), 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 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 second valve port (9). 3. The air valve for preventing flow interruption and bridging water hammer according to claim 2, characterized in that: both the first filter screen (2) and the second filter screen (8) are stainless steel filter screens. 4. The air valve for preventing flow interruption and bridging water hammer according to claim 1, 2 or 3, characterized in that: the air valve also includes a sealing ring (15), and the sealing ring (15) is fixedly installed on the first valve port (3) on the inner wall of the lower end.

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