CN113915390A

CN113915390A - Automatic drain valve based on membrane structure

Info

Publication number: CN113915390A
Application number: CN202111106456.2A
Authority: CN
Inventors: 张超智; 张富春
Original assignee: Nanjing University of Information Science and Technology
Current assignee: Nanjing University of Information Science and Technology
Priority date: 2021-09-22
Filing date: 2021-09-22
Publication date: 2022-01-11
Anticipated expiration: 2041-09-22
Also published as: CN113915390B

Abstract

The invention discloses an automatic drain valve based on a membrane structure, which comprises a valve casing, a filter screen device and a composite filter element, wherein the valve casing is of a sleeve structure with an opening at one end, the filter screen device and the composite filter element are sequentially arranged in the valve casing from inside to outside, a protective cover is arranged at the opening end of the valve casing, and water holes are formed in the closed end and the protective cover of the valve casing. Compared with the prior art, the invention has the advantages of easy assembly, lower cost, simple and convenient use and good stability.

Description

Automatic drain valve based on membrane structure

Technical Field

The invention relates to the field of automatic drain valves, in particular to an automatic drain valve based on a membrane structure.

Background

Compressed air is a common power source and is indispensable in industries such as industry and transportation industry. However, the condensed water in the compressed air may damage equipment for producing and using the compressed air, such as an air compressor, instruments, a power actuator, and the like. The small air compressor has the problems of high energy consumption, unstable output, easy damage and the like due to water stored in the air tank. The air cylinder in the brake system of the large-sized vehicle can reduce the air storage amount due to water storage, thereby causing potential safety hazards. The compressed air storage tank must be drained of water in a timely manner.

At present, water discharging devices are installed on all air compressor air tanks, compressed air conveying pipelines of large-scale factories and various types of equipment with compressed air inside, and the water discharging devices are divided into manual and automatic devices. Compared with manual drainage, the automatic drainage saves manpower, has stable drainage effect and reduces the failure probability of equipment.

Most of the existing automatic drain valves are of mechanical structures and need to be controlled. For example, the automatic water discharge valve described in patent CN 110657243 a is an automatic water discharge valve that uses compressed air as a power source and is controlled by a solenoid valve, and is an automatic valve with a compact structure and good water discharge effect. CN 107650902 a describes an automatic drain device for a brake system of a large bus, which can be controlled by using an electronic control system of the automobile. The patent CN 108278407A is an automatic drain valve for draining water of a train or a high-speed rail air cylinder, the automatic drain valve realizes automatic drainage without control, and the structure of more than 40 parts is complex, but the matching is precise, and the automatic drain valve can be called an industrial artwork. These automatic valves have in common that they use mechanical actuators to control the flow of water. In addition, there are many new patents on automatic water discharge valves, such as patent CN 205639735U, patent CN 205806590U, etc., which also avoid the use of springs, floats, etc., and their "switches" for controlling water flow are still maintained on a macroscopic scale.

These automatic water discharge valves having mechanical structures are also highly preferred by users, although they can maintain good water discharge effects. However, the cost problems caused by complicated structure, multiple parts, difficult maintenance and the like restrict the wide application of the automatic drain valve. And the action mechanism inevitably causes abrasion in the long-time movement process, and the matching state between parts can be changed, thereby influencing the drainage.

Therefore, an automatic drain valve having a simple structure, less parts, and low cost may improve this situation.

Disclosure of Invention

In view of the above situation, the present invention provides an automatic drain valve based on a membrane structure, which is used for draining water in compressed air storage equipment, so that the drain valve realizes automatic drainage without control, avoids the use of a mechanical action mechanism, and controls water flow with a micro-scale or nano-scale structure.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides an automatic drain valve based on membrane structure, includes valve casing, filter unit, combined filter core, the valve casing is one end open-ended sleeve structure, is equipped with filter unit and combined filter core in the valve casing from inside to outside in proper order, the visor is installed to the open end of valve casing, the blind end and the visor of valve casing all are equipped with the water hole.

As a further preference, the closed end of the valve housing has an external thread for connection with an external device.

As a further preferred scheme, a plurality of positioning rings and rubber rings are further arranged in the valve casing, and the positioning rings, the rubber rings, the filter screen device, the rubber rings, the positioning rings, the rubber rings, the composite filter element, the rubber rings and the positioning rings are sequentially arranged in the valve casing from inside to outside.

As a further preferred scheme, the inner wall of the valve casing is provided with internal threads, and the peripheries of the filter screen device, the composite filter element and the positioning ring are provided with external threads meshed with the internal threads.

As a further preferable scheme, the filter screen device is a blind plate with a siphon device, the siphon device comprises a siphon pipe and a vent pipe, the siphon pipe and the vent pipe both penetrate through the blind plate, the blind plate is circumferentially provided with external threads meshed with the inner wall of the valve casing, one end of the siphon pipe, which is positioned between the blind plate and the closed end of the valve casing, is a bent pipe, the pipe orifice of the bent pipe faces the blind plate, and the pipe orifice is provided with a filter screen.

As a further preferred option, the filter screen is 10 mm from the blind.

As a further preferred option, the sieve means is a sieve.

As a further preferred scheme, the composite filter element comprises a metal base, and a functionalized graphene membrane and a sand core which are positioned in the metal base, wherein the sand core is positioned on one side of the open end of the valve shell.

As a further preferable scheme, the sand core and the metal base are sealed by waterproof glue, the surface of the sand core is covered with a microporous filter membrane, and the functionalized graphene composite membrane is positioned on the microporous filter membrane.

As a further preferable scheme, the pore diameter of the microporous filter membrane is 0.1 um, and the loading capacity of the functionalized graphene composite membrane is about 100 g/square meter.

Compared with the prior art, the automatic drain valve realizes drainage without using a mechanical structure, and has the remarkable advantages that:

the manufacturing is easy. All parts have simple structures and are easy to produce in batches; the total number of parts is small, and the assembly is easy.

And secondly, the cost is lower. Besides the functionalized graphene, other special materials are not needed, and the composite filter element can realize the functions only by a few milligrams of functionalized graphene at least.

And thirdly, the use is simple. The valve body is in threaded connection with the gas tank, a hexagonal structure is arranged outside the valve shell, the valve is convenient to install, and automatic drainage can be achieved after installation.

And fourthly, the stability is good. Does not contain movable parts and is not easy to damage; the graphene has stable properties, and is beneficial to prolonging the service life and expanding the use scene; the water flux is large, and water can be drained in time.

Drawings

FIG. 1 is a schematic view of the components of the present invention;

FIG. 2 is a schematic view of the general assembly of the present patent;

FIG. 3 is a schematic view of a blind plate structure according to the present invention;

FIG. 4 is a schematic view of a composite filter element according to the present invention;

fig. 5 is a schematic structural diagram of the functionalized graphene film layer during water drainage and gas barrier.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings.

An automatic drain valve based on a membrane structure, comprising:

as shown in fig. 1, the automatic drain valve is composed of a valve housing 1, a filter unit 2, a composite filter element 3, a sealing ring and a positioning ring 4 (an external nut).

The valve casing 1 is a tubular structure, and the tip has seted up the water hole, and inside is equipped with the internal thread for install and fixed other spare part. The filter screen device 2 and the composite filter element 3 are sequentially arranged in the filter screen device from top to tail (auxiliary components such as a positioning ring 4 and the like are not described herein); the top end is provided with an external thread for connecting equipment needing water drainage; the tail part is provided with a protective cover 5 for protecting internal parts; the outside of valve casing 1 is equipped with the hexagonal structure, makes things convenient for the dismouting, and 5 central authorities of visor have the aperture that is used for the drainage.

The assembly of all parts of the invention is shown in figure 2. The external thread on the valve shell is used for being connected with an air storage tank or equipment needing water drainage, and the external thread on the protective cover is used for being connected with the valve shell; a blind plate or a filter screen with a siphon device, a positioning ring and a composite filter element are arranged in the valve shell through threads, and a rubber ring for sealing is not shown in the figure; the internal and external diameters and the thread depths of all the threads are the same, so that the serial installation of a plurality of valve bodies is facilitated.

The strainer device 2 is a blind plate 21 or a strainer with a siphon device, and as shown in fig. 3, a siphon pipe 22 and a breather pipe 23 are provided on the blind plate 21. The siphon device is used for intercepting large granules such as rust, prevents to damage the complex film, and the siphon device can be replaced with the filter screen. The water suction port of the siphon is also provided with a filter screen 24 to prevent large particles from blocking the siphon.

The composite filter element 3 is a main functional part, and the composite filter element 3 is composed of a metal base 51 (permeable), a sand core 53 and a functionalized graphene composite membrane 52, and the structural schematic diagram of the composite filter element is shown in fig. 4. The metal base is used for supporting the sand core, and the sand core is used for supporting the functionalized graphene composite membrane. During preparation, a sand core is placed on the metal base, a microporous filter membrane is placed on the sand core, and the edge is sealed by using a rubber ring or sealant. Dispersing a certain amount of functionalized graphene in water, loading hydroxylamine functionalized graphene on a microporous filter membrane by adopting a suction filtration method, and sealing the edge again.

As shown in fig. 5, in the presence of water, due to the large area of the functionalized graphene sheet, the layered graphene is not easily dispersed in water, and hydrophilic hydroxyl groups exist on the surface of the functionalized graphene, so that water easily enters between layers to form an interlayer channel, so that water molecules can pass through. When no water exists, as shown in fig. 5, the layered structure of the graphene is tightly stacked under the action of air pressure due to the excellent mechanical properties of the graphene, so that an airtight structure is formed.

The sealing ring and the positioning ring 4 are used for sealing and positioning, respectively. All parts are connected and fixed inside the valve housing 1 by threads without moving parts.

Example 1.

According to the automatic drain valve assembled as shown in fig. 2, the valve casing is made of cast copper, and the nominal diameters of the internal thread and the external thread are DN 15. And a positioning ring, a rubber ring, a filter screen, a rubber ring, a positioning ring, a rubber ring, a composite filter element, a rubber ring and a positioning ring are sequentially arranged in the valve shell, and a protective cover is finally arranged.

Wherein, the metal base of holding ring and composite filter core is the cast copper material, and the filter screen is the plastics material.

The manufacturing process of the composite filter element comprises the following steps: and (3) installing a sand core on the metal base, and sealing a gap between the sand core and the metal base by using waterproof glue. And covering a microporous filter membrane on the sand core, wherein the diameter of the microporous filter membrane is slightly larger than that of the sand core. And loading the functionalized graphene on the microporous filter membrane through suction filtration to form a composite filter membrane, and sealing the edge position of the composite filter membrane by using waterproof glue. And finishing the manufacture of the composite filter element.

The parameters of the composite filter element are as follows: the PE microporous filter membrane (the aperture is 0.1 um), and the loading capacity of the functionalized graphene is about 100 g/square meter.

The automatic drain valve is directly arranged at a water outlet at the bottom of the air storage tank of a small-sized air compressor through external threads at the top end. When water vapor condenses on the inner wall of the gas tank, formed condensed water flows downwards through the filter screen to remove particles such as rust and the like, and flows to the composite filter membrane, the functionalized graphene membrane layer allows water to pass through, and after the water passes through, the functionalized graphene membrane layer recovers an airtight structure, so that the purposes of draining water and blocking gas are achieved.

The gas storage tank reserve of the small air compressor is 0.6 m, the driving mode is motor driving, the gas storage pressure is 0.6 MPa, and the gas using period is 40 minutes.

Before the drain valve is installed, the air storage tank uses a manual mechanical drain valve to drain water. The water is drained once every 10 days, the water is not drained after more than 10 days, the air compressor needs to be additionally inflated once in an air using period, if the water is not drained after more than 15 days, and the air storage capacity and the pressure of the air compressor cannot meet the single consumption of air using equipment. After the drain valve is installed, the air compressor does not need to be additionally inflated in an air cycle; after 30 days, the drain valve was removed and no excess water was found to flow out of the reservoir.

Example 2.

According to the automatic drain valve assembled as shown in fig. 2, the valve casing is made of cast copper, the nominal diameter of the internal thread and the external thread is DN25, and the positioning ring, the rubber ring, the siphon device, the rubber ring, the positioning ring, the rubber ring, the composite filter element, the rubber ring and the positioning ring are sequentially arranged in the valve casing, and finally the protective cover is arranged.

Wherein, the metal base of holding ring and composite filter core is the cast copper material, and siphon device is the plastics material.

The parameters of the composite filter element are as follows: the PE microporous filter membrane (the aperture is 0.1 um), and the loading capacity of the functionalized graphene is about 60 g/square meter.

A filter screen is arranged at a water inlet of a siphon pipe of the siphon device, the distance between a water suction port and the blind plate is about 10 mm, and the distance between the highest position of a siphon pipe elbow and the blind plate is about 50 mm.

The automatic drain valve is directly installed at a water outlet at the bottom of a gas storage tank of a medium-sized air compressor through external threads at the top end. When the water vapor condenses on the inner wall of the tank, the formed condensed water flows down to the siphon device, and liquid water is accumulated due to the blocking of the blind plate. When the water level exceeds the highest point of the siphon, a siphon is created and the screen at the mouth of the siphon will block the particles from entering the siphon. After the siphon ended, because rivers and attach the particulate matter under the filter screen and can sink to the blind plate under the action of gravity to this prevents that the particulate matter from causing the jam and causes the damage to functional graphite alkene complex film. After the liquid water flows to the composite filter membrane, the functionalized graphene membrane layer allows water to pass through, and after the water passes through, the functionalized graphene membrane layer recovers an airtight structure, so that the purposes of draining water and blocking air are achieved.

The gas storage tank reserve volume of the medium-sized air compressor is 3.2 m through cultivation, the driving mode is motor driving, the gas storage pressure is 0.5 Mpa, and the gas using period is 80 minutes.

Before the drain valve is installed, the air storage tank uses a manual mechanical drain valve to drain water. The water is drained once every 5 days, the water is not drained after 8 days, the air compressor needs to be additionally inflated once in an air using period, if the water is not drained after 15 days, and the air storage capacity and the pressure of the air compressor cannot meet the single consumption of air using equipment. After the drain valve is installed, the air compressor does not need to be additionally inflated in an air cycle; after 30 days, the drain valve was removed and no excess water was found to flow out of the reservoir.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. The utility model provides an automatic drain valve based on membrane structure which characterized in that: including valve casing (1), filter unit (2), composite filter core (3), valve casing (1) is one end open-ended sleeve structure, is equipped with filter unit (2) and composite filter core (3) outside from inside in valve casing (1) in proper order, visor (5) are installed to the open end of valve casing (1), the blind end and visor (5) of valve casing (1) all are equipped with the water hole.

2. An automatic water drain valve based on membrane structure according to claim 1, characterized in that: the closed end of the valve housing (1) has an external thread for connection with an external device.

3. An automatic water drain valve based on membrane structure according to claim 1, characterized in that: still be equipped with a plurality of holding rings (4) and rubber circle in valve casing (1), be equipped with holding ring (4), rubber circle, filter unit (2), rubber circle, holding ring (4), rubber circle, composite filter core (3), rubber circle, holding ring (4) in proper order outside from inside in valve casing (1).

4. An automatic water drain valve based on membrane structure according to claim 3, characterized in that: the inner wall of valve casing (1) has the internal thread, filter screen device (2), composite filter core (3), holding ring (4) periphery have with the external screw thread of internal thread meshing.

5. An automatic water drain valve based on membrane structure according to claim 4, characterized in that: the filter screen device (2) is blind plate (21) for having siphon device, and siphon device includes siphon (22) and breather pipe (23), and siphon (22) and breather pipe (23) all run through in blind plate (21), and blind plate (21) circumference has the external screw thread with valve casing (1) inner wall meshing, and siphon (22) are located the one end between blind plate (21) and valve casing (1) blind end and are the return bend, and its mouth of pipe is towards blind plate (21), and the mouth of pipe has filter screen (24).

6. An automatic water drain valve based on membrane structure according to claim 4, characterized in that: the filter screen device (2) is a filter screen.

7. An automatic water drain valve based on membrane structure according to claim 4, characterized in that: the composite filter element (3) comprises a metal base (51), and a functionalized graphene membrane (52) and a sand core (53) which are positioned in the metal base (51), wherein the sand core (53) is positioned on one side of the opening end of the valve shell (1).

8. An automatic water drain valve based on membrane structure according to claim 8, characterized in that: the sand core (53) and the metal base (51) are sealed through waterproof glue, a microporous filter membrane covers the surface of the sand core (53), and the functionalized graphene (52) is located on the microporous filter membrane.

9. An automatic water drain valve based on membrane structure according to claim 9, characterized in that: the pore diameter of the microporous filter membrane is 0.1 um, and the load capacity of the functionalized graphene (52) is about 100 g per square meter.