Backwater prevention device using hydrophobic membrane

Abstract

The utility model relates to the field of gas-liquid mixing, in particular to a backwater prevention device using a hydrophobic membrane, which comprises a gas-liquid mixing system, an inclined three-way pipe and a backwater prevention device are arranged at the tail end of the gas-liquid mixing system, the inclined three-way pipe comprises a horizontal pipe and an inclined pipe, the backwater prevention device comprises a shell, and an inner breather pipe is arranged in the shell. A spiral blade is arranged between the inner breather pipe and the shell, an outer breather pipe is arranged on the top of the shell, a ventilation window is installed on the top of the outer breather pipe in a threaded mode, the outer breather pipe and the inner breather pipe are detachably connected, a hydrophobic film is installed in the ventilation window, and a water inlet is formed in one side of the shell and communicated with a horizontal pipe. A water outlet is formed in the bottom of the shell, and a floating ball is arranged between the water outlet and the inner breather pipe. The device has the advantages that water storage is not needed, the occupied area is small, the hydrophobic membrane is breathable and waterproof, the effects of balancing air pressure and preventing water return can be achieved, and replacement is easy due to threaded installation.

Description

Technical Field

[0001] The utility model relates to the field of gas-liquid mixing, in particular to a water backflow prevention device using a hydrophobic membrane. Background Art

[0002] When the gas-liquid mixing system is working, a fluid with a certain pressure is generally ejected at high speed through the gas-liquid mixing chamber through a venturi tube, a gas-liquid mixing device, or a gas-liquid mixing pump. However, when the gas-liquid mixing system stops working, a negative pressure will be generated in the pipeline, and the liquid will be sucked into the pipeline. The sucked pipeline may be left to the gas supply equipment, which will affect the service life of the gas supply equipment over time. The prior art installs an anti-backwater device in the gas-liquid mixing system, which generally uses the principle of different densities to separate water and gas. The disadvantage is that a water storage tank needs to be set up, so it occupies a large area, and the water storage tank needs to be depressurized and drained, otherwise there is a risk of explosion.

[0003] Based on this, the utility model designs a water backflow prevention device using a hydrophobic membrane. Utility Model Content

[0004] The utility model aims to provide a water backflow prevention device using a hydrophobic membrane to solve the problems existing in the prior art.

[0005] In order to solve the above technical problems, the utility model is achieved through the following technical solutions:

[0006] A backwater prevention device using a hydrophobic membrane comprises a gas-liquid mixing system, an oblique tee and a backwater prevention device are installed at the end of the gas-liquid mixing system, the oblique tee comprises a horizontal pipe and an oblique pipe, the backwater prevention device comprises a shell, an inner ventilation pipe is arranged in the shell, a spiral blade is arranged between the inner ventilation pipe and the shell, an outer ventilation pipe is arranged on the top of the shell, a ventilation window is threadedly installed on the top of the outer ventilation pipe, the outer ventilation pipe and the inner ventilation pipe are detachably connected, a hydrophobic membrane is installed in the ventilation window, a water inlet is arranged on one side of the shell, the water inlet is connected to the horizontal pipe, the oblique pipe faces upward from the backwater prevention device, a water outlet is arranged at the bottom of the shell, a float is arranged between the water outlet and the inner ventilation pipe.

[0007] The ventilation window comprises an upper frame and a lower frame, the upper frame and the lower frame are connected by bolts, the hydrophobic film is clamped between the upper frame and the lower frame, and gaskets are arranged on the upper frame and the lower frame.

[0008] A base is arranged at the outer edge of the external ventilation pipe, a limiting ring is arranged at the top of the shell, a sealing ring is arranged inside the limiting ring, and the lower edge of the base matches the limiting ring.

[0009] The bottom of the shell is funnel-shaped.

[0010] The edges of the inner vent pipe and the water outlet are both provided with wedge-shaped openings which are consistent with the outer surface of the floating ball.

[0011] The gas-liquid mixing system comprises a gas source, a gas-liquid mixing pump and a static gas-liquid mixer in sequence, and the three are connected through pipelines. The other end of the inclined three-way pipe is connected to an aeration head.

[0012] The utility model has the following beneficial effects:

[0013] 1. No need to store water, small footprint, and balanced pressure in the pipe;

[0014] 2. The hydrophobic membrane is breathable and watertight, which can balance the air pressure and prevent water backflow, and the threaded installation is easy to replace; BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 This is a schematic diagram of the installation position of the utility model;

[0017] Figure 2 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 3 for Figure 2 A magnified view of the structure at center;

[0019] Figure 4 for Figure 2 Enlarged view of the structure at point B in the middle.

[0020] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0021] 1. Oblique tee; 101. Horizontal pipe; 102. Oblique pipe; 2. Static gas-liquid mixer; 3. Gas source; 4. Aeration head; 5. Gas-liquid mixing pump; 6. Backwater prevention device; 7. Outer shell; 8. Internal ventilation pipe; 9. Spiral blades; 10. Hydrophobic membrane; 11. Air window; 1101. Upper frame; 1102. Lower frame; 1103. Bolts; 1104. Gasket; 12. Water inlet; 13. Water outlet; 14. Float; 15. External ventilation pipe; 1501. Base; 1502. Limiting ring; 1503. Sealing ring; 16. Wedge-shaped mouth. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. It should be understood that the terms "upper", "middle", "outer", "inner", "lower" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific direction, and therefore cannot be understood as limiting the present invention.

[0023] The accompanying drawings are specific embodiments of the present utility model. Figure 1-Figure 4 As shown, the utility model is a backwater prevention device using a hydrophobic membrane, including a gas-liquid mixing system, which in turn includes a gas source 3, a gas-liquid mixing pump 5, and a static gas-liquid mixer 2, which are connected by pipelines, and the other end of the inclined three-way pipe 1 is connected to an aeration head 4. An inclined three-way pipe 1 and a backwater prevention device 6 are installed at the end of the gas-liquid mixing system, and the inclined three-way pipe 1 includes a horizontal pipe 101 and an inclined pipe 102, and has a high drainage efficiency; the backwater prevention device 6 includes a shell 7, an inner vent pipe 8 is provided in the shell 7, and a spiral blade 9 is provided between the inner vent pipe 8 and the shell 7 as a water flow channel to accelerate the water flow emptying speed. The top of the shell 7 is provided with an external vent pipe 15, the top of the external vent pipe 15 is threadedly installed with an internal vent pipe 8, and the top of the external vent pipe 15 is provided with a vent window 11 through a flange, and the vent window 11 includes an upper frame 1101 and a lower frame 1102, and the upper frame 1101 and the lower frame 1102 are connected by bolts 1103, and the hydrophobic membrane 10 is clamped between the upper frame 1101 and the lower frame 1102, and a gasket 1104 is provided between the upper frame 1101 and the lower frame 1102, which is convenient for replacing the hydrophobic membrane 10, and the hydrophobic membrane 10 can adopt any kind of breathable and watertight membrane, which can achieve the effect of breathable and watertight. A water inlet 12 is provided on one side of the shell 7, and the water inlet 12 is connected to the horizontal pipe 101, and the oblique pipe 102 is toward the top of the backwater prevention device 6, and the bottom of the shell 7 is funnel-shaped, and a water outlet 13 is provided to accelerate the discharge of water flow. A floating ball 14 is provided between the water outlet 13 and the inner vent pipe 8. The floating ball 14 is used to balance the pressure in the pipe. The edges of the inner vent pipe 8 and the water outlet 13 are provided with wedge-shaped openings 16 that match the outer surface of the floating ball 14. A base 1501 is provided on the outer ring of the middle section of the outer vent pipe 15, a limiting ring 1502 is provided on the top of the outer shell 7, and a sealing ring 1503 is provided inside the limiting ring 1502. The lower edge of the base 1501 matches the limiting ring 1502, which plays a role in sealing the outer vent pipe 15 and the inner vent pipe 8, and the outer vent pipe 15 is easy to disassemble.

[0024] When the gas-liquid mixing system works normally, the gas-liquid mixed liquid enters the inclined three-way pipe 1 through the inclined pipe 102 and is released by the terminal device such as the aeration head 4. At this time, the float 14 falls into the wedge-shaped opening 16 of the water outlet 13, thereby blocking the water outlet 13. The gas outside the air window 11 enters the backflow prevention device 6 through the inner ventilation pipe 8 and the outer ventilation pipe 15, and enters the horizontal pipe 101 through the water inlet pipe 12, so that the gas can be continuously supplied.

[0025] When the gas-liquid mixing system stops working, the negative pressure generated will suck water into the horizontal pipe 102 of the inclined tee pipe. The water flows into the horizontal pipe 102, causing the air pressure in the pipe to increase. The gas in the pipe is forced out by the air window 11, and the water flows into the backflow prevention device 6 through the water inlet 12. After being accelerated by the water passage with spiral blades 9, it enters the funnel of the outer shell 7. The overflowing water flow floats the float 14, and the floated float 14 blocks the wedge-shaped opening 16 of the inner ventilation pipe 8. The air path is blocked, and the water flows out from the water outlet 13. The pressure in the pipe can be balanced and the backflow can be prevented without installing a valve.

[0026] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the present invention to specific implementation methods.

Claims

1. A backflow prevention device using a hydrophobic membrane, comprising a gas-liquid mixing system, an inclined tee pipe (1) and a backflow prevention device (6) are installed at the end of the gas-liquid mixing system, the inclined tee pipe (1) comprising a horizontal pipe (101) and an inclined pipe (102), characterized in that: The water backflow prevention device (6) comprises a shell (7), an inner vent pipe (8) is arranged inside the shell (7), a spiral blade (9) is arranged between the inner vent pipe (8) and the shell (7), an outer vent pipe (15) is arranged at the top of the shell (7), a vent window (11) is threadedly installed at the top of the outer vent pipe (15), the outer vent pipe (15) and the inner vent pipe (8) are detachably connected, a hydrophobic membrane (10) is installed in the vent window (11), a water inlet (12) is arranged at one side of the shell (7), the water inlet (12) is connected to a horizontal pipe (101), the inclined pipe (102) faces upward of the water backflow prevention device (6), a water outlet (13) is arranged at the bottom of the shell (7), and a floating ball (14) is arranged between the water outlet (13) and the inner vent pipe (8).

2. The device for preventing backflow using a hydrophobic membrane according to claim 1, characterized in that: The air permeable window (11) comprises an upper frame (1101) and a lower frame (1102); the upper frame (1101) and the lower frame (1102) are connected via bolts (1103); the hydrophobic membrane (10) is sandwiched between the upper frame (1101) and the lower frame (1102); and gaskets (1104) are provided on the upper frame (1101) and the lower frame (1102).

3. The device for preventing water backflow using a hydrophobic membrane according to claim 1, characterized in that: A base (1501) is provided at the outer edge of the external ventilation pipe (15), a limiting ring (1502) is provided at the top of the outer shell (7), a sealing ring (1503) is provided inside the limiting ring (1502), and the lower edge of the base (1501) matches the limiting ring (1502).

4. The device for preventing water backflow using a hydrophobic membrane according to claim 1, characterized in that: The bottom of the shell (7) is funnel-shaped.

5. The device for preventing water backflow using a hydrophobic membrane according to claim 1, characterized in that: The edges of the inner ventilation pipe (8) and the water outlet (13) are provided with wedge-shaped openings (16) which match the outer surface of the floating ball (14).

6. The device for preventing backflow using a hydrophobic membrane according to claim 1, characterized in that: The gas-liquid mixing system comprises, in sequence, a gas source (3), a gas-liquid mixing pump (5), and a static gas-liquid mixer (2), the three of which are connected via a pipeline, and the other end of the inclined three-way pipe (1) is connected to an aeration head (4).

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