CN104373742A - Pressure limiting type liquid column separation preventing air valve - Google Patents

Abstract

The invention discloses a pressure-limiting anti-liquid column separation air valve, which comprises an upper chamber ⒂ and a lower chamber ⒁ connected by a flange, and the lower chamber ⒁ is also connected with a pressure relief chamber ⒃; the upper chamber The lower part of the chamber ⒂ is provided with an intake and exhaust channel, and the floating plate ⑸ is connected to the top of the upper chamber ⒂ through a limit spring ⑺, and the top of the intake and exhaust channel is provided with a support plate ⑷ for supporting the floating plate ⑸; the upper chamber ⒂ is equipped with a Inlet and exhaust channels, there is a U-shaped guide plate (3) in the intake and exhaust channels, a metal ball (1) is set inside the guide plate (3), and a shaft (2) is provided at the center of the bottom of the metal ball (1), and the lower end of the shaft (2) is a free end. Its advantages are: the invention is installed along the water supply pipeline, which can improve the efficiency and prevent the water hammer from starting the pump; when an accident occurs and the pump stops, the invention can absorb a large amount of air to prevent vaporization when there is negative pressure in the pipe through the adjustment of the floating plate ; When the pressure in the pipeline is too high, a small amount of exhaust gas acts as a buffer to prevent the occurrence of bridging water hammer, and part of the high-pressure water in the pipeline can also be released to reduce the pressure through the present invention.

Description

Pressure-limiting anti-liquid column separation air valve

technical field

The invention relates to the technical field of air valves, in particular to an air valve which can reduce the pressure inside a pipe by releasing part of high-pressure water.

Background technique

Air valve is the most commonly used water hammer protection measure in water supply engineering. At present, in the water supply system, air valves are often arranged along the pipeline, especially at local convex points. When the power supply of the pump station unit is suddenly cut off or the pump is shut down due to an accident, it quickly replenishes a large amount of air into the pipeline to eliminate the vaporization phenomenon caused by the separation of the liquid column; By slowly exhausting, it acts as a buffer to prevent bridging water hammer; however, during the pump start process, this type of air valve cannot quickly discharge the gas in the pipe to prevent the occurrence of pump water hammer; In the process, as the water supply distance becomes longer and the flow rate continues to increase, the ordinary air valve often causes the gas in the pipe to not be discharged in time due to its characteristics of rapid air intake and slight exhaust, and is squeezed by the liquid column, making the pipe inside A large amount of high-pressure gas will remain, which will increase the pressure of the water in the nearby pipe, especially when the air valve is installed in many places and dense, it will increase the pressure risk of the entire pipeline. At present, air valve manufacturers at home and abroad can only solve one or two of the above-mentioned problems, and the problem of high water pressure caused by residual high-pressure gas in the pipeline has not been solved.

Contents of the invention

The purpose of the present invention is to design a pressure-limiting anti-liquid column separation air valve for the above-mentioned status quo, which can discharge the gas in the pipe in time when the pump is started, improve the delivery efficiency, and prevent the occurrence of water hammer when the pump is started; When hammering, it can also play the function of gas injection and micro discharge to prevent the occurrence of vaporization and bridging water hammer; when the water pressure in the pipeline is high due to high-pressure gas, part of the high-pressure water will be released to reduce the pressure in the pipeline and prevent the pipeline from breaking. The effect is good and the efficiency is high.

A pressure-limiting anti-liquid column separation air valve, including an upper chamber 15 and a lower chamber 14 connected by flanges, the lower chamber 14 is also connected with the pressure relief chamber 16; the lower part of the upper chamber 15 is opened Inlet and exhaust channels, the floating plate 5 is connected to the top of the upper chamber 15 through the limit spring 7, and the top of the intake and exhaust channels is provided with a support plate 4 for supporting the floating plate 5; the upper chamber 15 is provided with an intake and exhaust channel , there is a guide plate 3 with a U-shaped section in the intake and exhaust passage, a metal ball 1 is arranged inside the guide plate 3, a shaft 2 is arranged at the center of the bottom of the metal ball 1, and the lower end of the shaft 2 is a free end, wrapped in the guide plate 3 In the bottom; the lower end of the pressure relief chamber 16 is provided with an annular discharge passage 12, and the bottom of the pressure relief chamber 16 has an overflow hole 11, and the pressure relief chamber 16 is provided with a plugging cone valve head 9 for the flow hole 11, and the cone The shaped valve head 9 is connected to the top of the pressure relief chamber 16 through a limit spring 10 .

An exhaust hole 6 is opened in the center of the floating plate 5 .

The diameter of the metal ball 1 is larger than the diameter of the passage where the upper chamber 15 and the lower chamber 14 meet.

Sealing rings 13 are respectively provided at the junctions of the upper chamber 15 and the lower chamber 14 and the junctions of the lower chamber 14 and the pressure relief chamber 16 .

The advantages of the pressure-limiting type anti-liquid column separation air valve of the present invention are:

1. The air valve is installed along the water supply pipe, which can remove the residual gas in the pipe during the water filling process, improve efficiency and prevent water hammer when starting the pump;

2. When the pump stops in an accident, the air valve can be adjusted by the floating plate. When there is negative pressure in the pipe, a large amount of air can be sucked to prevent vaporization; when the pressure in the pipe is too high, a small amount of exhaust can act as a buffer to prevent bridging water hammer happened;

3. When the pressure in the pipeline is too high due to the entry of a large amount of gas, part of the high-pressure water can be released through the discharge chamber of the air valve to reduce the pressure in the pipeline and prevent the occurrence of pipe burst.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the present invention.

Fig. 2 is a schematic diagram of a half-section structure of the present invention.

Fig. 3 is a schematic perspective view of the three-dimensional structure of the pressure relief chamber.

Fig. 4 is a schematic diagram of a half-section structure of the pressure relief chamber.

In the figure, 1 is a metal ball, 2 is a shaft, 3 is a guide plate, 4 is a support plate, 5 is a floating plate, 6 is an exhaust hole, 7 and 10 are pressure limiting springs, 8 is a limit valve body, 9 11 is an overflow hole, 12 is a discharge channel, 13 is a sealing ring, 14 is a lower chamber, 15 is an upper chamber, and 16 is a pressure relief chamber.

Detailed ways

Below in conjunction with accompanying drawing, the present invention is further described: as shown in Figure 1-4, a kind of pressure-limiting type anti-liquid column separation air valve is provided with a metal ball 1 that can move up and down by liquid buoyancy in the lower chamber and The guide plate 3 that controls the movement direction of the metal ball by controlling the movement of the shaft 2 connected to the lower end of the metal ball 1, there is a large-diameter air intake channel above the metal ball 1; the support plate 4 that supports the floating plate 5 in the upper chamber , wherein the center of the floating plate 5 is provided with an exhaust hole 6, and a pressure limiting spring 7 and a limit valve body 8 are provided above it; The pressure-limiting spring 10 is provided with an overflow hole 11 below, and an annular discharge channel 12 is provided around the valve body of the discharge chamber.

The initial state of the floating plate 5 is pressed on the support plate 4 by the upper pressure limiting spring 7; the limit valve body 8 can be tightly attached to the floating plate 5 when the gas blows up the floating plate 5 to play a sealing role;

The pressure-limiting spring 10 in the pressure relief chamber presses the head of the conical valve head 9 against the outlet hole 11. When the high-pressure water pushes the valve head up, the high-pressure water leaks out through the discharge channel 12 of the valve body 16 in the pressure relief chamber. pressure inside the tube.

The connecting surface of the lower chamber valve body 14 and the upper chamber valve body 15 is sealed by the sealing ring 13 .

The specific working method is:

As shown in Figure 1, the metal ball in the lower chamber can only be lifted by the buoyancy of the liquid transported in the pipeline where the multi-functional intake and exhaust air valve that can drain water and reduce pressure can be used. The buoyancy floats up and blocks the upper air intake and exhaust channels to prevent water leakage.

There is a small hole in the center of the floating plate in the upper chamber. When the tube is filled with water, the metal ball falls or does not float completely, and the gas pressure in the tube is small. The pressure limiting spring above the floating plate presses the floating plate against the supporting plate below. , the gas is quickly discharged from the side of the floating plate; when the pump is suddenly stopped and the liquid column is separated, the metal ball falls, and negative pressure is generated in the pipe, the floating plate stops on the support plate, and a large amount of outside gas enters the pipe through the large-diameter channel to prevent vaporization ; When the gas pressure in the pipe rises, the floating plate is blown up to the limit valve body by the gas, and the gas is slowly and slightly discharged from the small hole in the center of the floating plate, which acts as a buffer and prevents the occurrence of bridging water hammer.

When a large amount of gas is sucked into the pipe but not discharged in time, due to the buoyancy of the water, the metal ball rises to block the upper exhaust channel due to the buoyancy of the liquid column, and the pressure of the gas in the pipe rises, causing the surrounding liquid to rise. When the pressure-limiting spring on the top of the conical valve head in the pressure chamber, the conical valve head is pushed away, the high-pressure water is released, reducing the liquid pressure in the pipe.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which the present invention belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the present invention or go beyond the definition of the appended claims range.

Although this article uses more metal balls 1, shaft rods 2, guide plates 3, support plates 4, floating plates 5, exhaust holes 6, pressure limiting springs 7, limit valve bodies 8, conical valve heads 9, limit valves, etc. Compression spring 10, flow hole 11, discharge channel 12, sealing ring 13, lower chamber 14, upper chamber 15, pressure relief chamber 16 and other terms, but the possibility of using other terms is not excluded. These terms are used only for the purpose of describing and explaining the essence of the present invention more conveniently; interpreting them as any kind of additional limitation is against the spirit of the present invention.

Claims (4)

1. the anti-column separation air valve of limited pressure, is characterized in that: comprise upper chamber (15) with lower chambers (14) by Flange joint, (16) (14) described lower chambers be also connected with pressure releasing chamber; Described upper chamber (15) bottom offers intake and exhaust channel, and (15) (7) (5) kickboard be connected at top with upper chamber by limit spring, and intake and exhaust channel top is provided with for supporting kickboard dunnage (5) (4); Described upper chamber (15) in establish intake and exhaust channel, be provided with in intake and exhaust channel section be the guide plate of U-shaped (3), guide plate (3) in establish Metal Ball (1), (2) Metal Ball (1) bottom centre is provided with axostylus axostyle, and axostylus axostyle (2) lower end is free end; (12) described pressure releasing chamber (16) lower end offers annular current by pass, and (11) pressure releasing chamber (16) bottom has flowing hole, pressure releasing chamber (16) in establish for flowing hole blocking cone-shaped valve head (11) (9), (16) (10) (9) cone-shaped valve head be connected at top with pressure releasing chamber by limit spring.

2. the anti-column separation air valve of limited pressure as claimed in claim 1, is characterized in that: (6) described kickboard (5) center has exhaust port.

3. the anti-column separation air valve of limited pressure as claimed in claim 1, is characterized in that: described Metal Ball diameter be (1) greater than upper chamber (15) with the channel diameter of lower chambers (14) connecting part.

4. the anti-column separation air valve of limited pressure as claimed in claim 1, is characterized in that: (13) (14) (15) described upper chamber be respectively equipped with seal ring with pressure releasing chamber joint (16) with lower chambers joint (14), lower chambers.