KR102036995B1 - Piezoelectric separator with improved watertightness - Google Patents

Abstract

The present invention provides a piezoelectric separator assembly for generating vibration through electricity, the assembly main body is connected to the external power source and the electricity is energized and the inlet and outlet are respectively formed in and out of the fluid; A membrane unit accommodated in the assembly body and generating vibration by a piezoelectric effect using electricity transferred from the power source; And a concentrate pressure measuring unit installed at an outlet of the assembly main body to measure and control the pressure of the concentrate introduced into the assembly main body, wherein the membrane unit is prepared by fouling the pores formed in a portion to a predetermined size. It is characterized by preventing the ring phenomenon.

Description

Piezoelectric membrane assembly with improved water tightness {PIEZOELECTRIC SEPARATOR WITH IMPROVED WATERTIGHTNESS}

The present invention relates to a piezoelectric separator, and more particularly, to a piezoelectric separator assembly having improved water-tightness, which is improved in water-tightness and which makes it possible to use piezoelectric phenomenon in water.

In general, membranes have been converted from laboratory use to industrial processes by Loeb-Sourirajan in the early 1960s, so membrane separation and purification processes can be performed on food (dairy, beverage, fish, etc.) and batteries (vanadium redox flow batteries, Fuel cells).

In addition, water treatment membranes are also used in the field of treating a variety of water, including drinking water, wastewater, brackish water and seawater for health protection purposes, high-quality water production, water supply expansion, low-cost water treatment and maintaining water quality. Is being used by.

Currently, new films are being developed by researchers. At the same time, various researches on antifouling have been made to improve the membranes currently used in various fields because of the deterioration in operating performance due to fouling and hydrophobic properties. Membranes are made of organic or inorganic materials, or combinations thereof. Among some membrane materials, poly (vinylidene fluoride (PVDF)) has advantageous features of high strength, thermal stability and chemical resistance.

However, PVDF membranes are susceptible to contamination, reducing fouling flux, reducing removal rates, and increasing energy consumption. In particular, PVDF microfiltration (MF) membranes are vulnerable to humic acid (HA), which is usually natural organic matter (NOM). For that reason, research into the hydrophilicity and smooth surface formation of membranes has been focused on the humic acid contamination and hydrophobic dilemma, which are the major factors associated with studies for enhancing antifouling characteristics.

Among various methods, graft copolymerization has recently been reported to be suitable for the purpose of enhancing antifouling characteristics. In this method, the functional polymeric material synthesized by the atom transfer radical polymerization (ATRP) method is used for the preparation of hydrophilic and / or antifouling membranes. Some researchers described PVDF mixed with poly (vinylidene fluoride) -graft-poly (hydroxyethylmethacrylate) (PVDF-g-PHEMA) according to the ATRP method. Membranes were prepared and other researchers used poly (vinylidene fluoride) -graftpoly (oxyethylene methacrylate) (PVDF-g-POEM) and poly (vinylidene fluoride) -graft polyacrylamide according to the ATRP method. Poly (vinylidene fluoride) -graft poly (sulfobetaine methacrylate) (PVDF-g-PSBMA) was synthesized. Poly (vinylidene fluoride) -graft-poly (sulfobitin methacrylate) Membranes with PVDF / PVDF-g-PHEMA, PVDF / PVDF-g-POEM and PVDF / PVDF-g-PSBMA have been prepared to have antifouling and hydrophilic properties using hydrophilic and / or amphiphilic chains.

It has also been reported to mix with inorganic salts according to other methods. Thus, lithium chloride (LiCl) was mixed with PVDF to produce improved anti fouling characteristics. Therefore, there is a need for a new technology development capable of manufacturing PVDF-based microfiltration membranes having improved antifouling properties.

Republic of Korea Patent No. 10-1738732 (Invention name: Method of manufacturing a polymer membrane with enhanced antifouling properties)

Therefore, the present invention has been made to solve the above problems, the problem to be solved of the present invention is to improve the flux while reducing the fouling that can occur in the process of filtering the raw water using a piezoelectric separator. It is to provide a piezoelectric separator assembly with improved water tightness capable of being provided.

In addition, another object of the present invention is to provide an improved water-tight piezoelectric separator assembly having a function of enhancing water-tightness for smooth operation of the piezoelectric separator in water.

However, the technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned above are clearly apparent to those skilled in the art from the following description. It can be understood.

The present invention has been made to improve the problems of the prior art as described above, the piezoelectric separator assembly that generates vibration through electricity, the inlet and outlet which is connected to the external power supply and the electricity is supplied to the fluid flow in and out Assembly bodies each formed; A membrane unit accommodated in the assembly body and generating vibration by a piezoelectric effect using electricity transferred from the power source; And a concentrate pressure measuring unit installed at an outlet of the assembly main body to measure and control the pressure of the concentrate introduced into the assembly main body, wherein the membrane unit is prepared by fouling the pores formed in a portion to a predetermined size. The ring phenomenon can be prevented.

In addition, the assembly main body, the upper plate member is formed with a first connection hole in which the electrical wire connected to the power supply; A lower plate member manufactured to correspond to the upper plate member and provided with a portion of the inlet port and an outlet port, the lower plate member detachably coupled to the upper plate member in a state in which a second connection hole corresponding to the first connection hole is formed; And a coupling member formed at a corresponding portion of each of the upper plate member and the lower plate member to couple the upper plate member and the lower plate member through a bolted coupling.

The membrane unit may further include a piezoelectric membrane on which a web made from the PZT-PVDF composite solution is electrospun; A permit carrier manufactured to correspond to the piezoelectric membrane to be in contact with an upper portion of the piezoelectric membrane and to have a compact structure of a predetermined degree for increasing electrode efficiency of the piezoelectric membrane; And a feed spacer manufactured to correspond to the piezoelectric membrane and coated with an insulating and waterproof material on one surface thereof with a conductive and porous support contacting the lower portion of the piezoelectric membrane, and formed of pores having a predetermined size to prevent fouling. It may include.

In addition, the concentrate pressure measuring unit, a pressure gauge for measuring and displaying the pressure of the concentrate contained in the assembly body; And a control valve connected to the pressure gauge to control the pressure inside the assembly main body by controlling the discharge of the concentrate while monitoring the amount of the concentrate introduced into the assembly main body.

In addition, the permit carrier and the feed spacer may be made of titanium having a mesh shape.

In addition, the O-ring is inserted between the upper plate member and the lower plate member when the coupling between the upper plate member and the lower plate member O-ring to enhance the watertightness while filling the gap between the upper plate member and the lower plate member; may further include.

In addition, the O-ring material may be silicon;

In addition, the core is inserted into the lower portion of the membrane module in the assembly body to strengthen the adhesion of the membrane unit to improve the piezoelectric effect and water tightness; may further include a.

According to one embodiment of the invention, there is an effect of.

In addition, according to one embodiment of the present invention, by adjusting the size of the pores of the feed spacer, while reducing the fouling that may occur in the process of filtering the raw water using the piezoelectric separation membrane, it is possible to improve the flux at the same time.

In addition, the structure of the permit carrier can be manufactured under high density to improve the efficiency of the electrode generated in the piezoelectric membrane.

In addition, the O-ring and the shim may be inserted into the upper plate member and the lower plate member and the piezoelectric membrane watertightness may be enhanced to stably generate piezoelectric phenomenon in water.

However, effects obtained in the present invention are not limited to the above-mentioned effects, and other effects not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

The following drawings, which are attached in this specification, illustrate preferred embodiments of the present invention, and together with the detailed description of the present invention, serve to further understand the spirit of the present invention. It should not be construed as limited to.
1 is an exploded perspective view of an improved piezoelectric separator assembly according to an embodiment of the present invention.
2 is a cross-sectional view of the assembly.
3 is a plan view of the assembly.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. However, since the description of the present invention is only an embodiment for structural or functional description, the scope of the present invention should not be construed as being limited by the embodiments described in the text. That is, the embodiments may be variously modified and may have various forms, and thus, the scope of the present invention should be understood to include equivalents for realizing the technical idea. In addition, the objects or effects presented in the present invention does not mean that a specific embodiment should include all or only such effects, the scope of the present invention should not be understood as being limited thereby.

The meaning of the terms described in the present invention will be understood as follows.

Terms such as "first" and "second" are intended to distinguish one component from another component, and the scope of rights should not be limited by these terms. For example, the first component may be named a second component, and similarly, the second component may also be named a first component. When a component is referred to as being "connected" to another component, it should be understood that there may be other components in between, although it may be directly connected to the other component. On the other hand, when a component is said to be "directly connected" to another component, it should be understood that there is no other component in between. On the other hand, other expressions describing the relationship between the components, such as "between" and "immediately between" or "neighboring to" and "directly neighboring to", should be interpreted as well.

Singular expressions should be understood to include plural expressions unless the context clearly indicates otherwise, and terms such as "include" or "have" refer to features, numbers, steps, operations, components, parts, or parts thereof described. It is to be understood that the combination is intended to be present and does not exclude in advance the possibility of the presence or addition of one or more other features or numbers, steps, operations, components, parts or combinations thereof.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. Generally, the terms defined in the dictionary used are to be interpreted as being consistent with the meanings in the context of the related art, and should not be interpreted as having ideal or excessively formal meanings unless clearly defined in the present invention.

1 is an exploded perspective view of a piezoelectric separator assembly having improved watertightness according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the assembly, and FIG. 3 is a plan view of the assembly.

1 to 3, as a piezoelectric separator assembly for generating vibration through electricity, the present invention may include an assembly body 100, a membrane unit 200, and a concentrate pressure measuring unit 300. have.

The assembly main body 100 may be connected to an external power source, and may have a structure in which an inlet 70 and an outlet 50 through which electricity is supplied and fluid flows in and out of the portion are formed.

The assembly body 100 may include an upper plate member 110, a lower plate member 120, and a coupling member 130.

The upper plate member 110 may have a structure in which a first connection hole is formed in which a wire connected to a power source communicates.

The lower plate member 120 is manufactured to correspond to the upper plate member 110 and has an inlet port 70 and an outlet port 50 at each portion thereof, and the upper plate member (with a second connection hole corresponding to the first connection hole formed). And may be detachably combined with 110).

Coupling member 130 is formed in the corresponding portion of each of the upper plate member 110 and the lower plate member 120 may be coupled to the upper plate member 110 and the lower plate member 120 through the coupling of the bolt method. In detail, the coupling member 130 is coupled to the plurality of post guides 134 and the post guide 134 which are formed to correspond to portions of the upper plate member 110 and the lower plate member 120, respectively. 132 may include. In this case, a female thread may be formed in the post guide 134, and a male thread may be formed in the coupling post 132.

The membrane unit 200 is accommodated in the assembly body 100 and may generate vibration by a piezoelectric effect using electricity transferred from a power source. Specifically, the piezoelectric effect is a phenomenon in which a voltage is generated when a mechanical pressure is applied and a mechanical deformation occurs when a voltage is applied, and when a stress is applied, a voltage is generated on the surface. It is a phenomenon of moving or generating force. Representative products using piezoelectric effect include microphone, speaker, ultrasonic detector, crystal clock oscillator, etc. Recently, lens driving device for zoom / auto focus function of mobile phone camera module because of higher output and less noise than small motor of same size It is applied to.

The membrane unit 200 may prevent the fouling phenomenon by manufacturing the pores formed in a portion to a predetermined size. Specifically, fouling is a phenomenon in which the membrane is blocked by contaminants in the influent in membrane filtration and refers to deterioration of membrane performance due to external factors rather than deterioration of the membrane itself in membrane filtration. The solute flowing into the membrane causes clogging of the membrane, blockage of the flow path, or formation of an adhesion layer. The causative agents include sucrose, scale, silica, metal oxides, organic matter, microorganisms, and the like. Degradation of irreversible film performance caused by deterioration of the membrane itself is called deterioration.

The membrane unit 200 may include a piezoelectric membrane 210, a permit carrier 220, and a feed spacer 230.

The piezoelectric membrane 210 is a component in which a web made from the PZT-PVDF composite solution is electrospun. Specifically, PVDF has a relatively large dipole moment among the polymers and thus exhibits a high dielectric constant, and has flexibility and corrosion resistance, which are characteristics of the polymer. In addition, PVDF is easy to process, inexpensive, and has excellent thermal stability and chemical resistance, and thus has stable properties for humidity-sensitive electrospinning processes. The PZT [Pb (Zr _x Ti _1-x ) O ₃ ] powder is a representative piezoelectric material, and has various properties such as ferroelectricity, pyroelectricity, and piezoelectricity, and is a non-volatile memory device using ferroelectricity and a mobile communication device using dielectric properties. It is widely used in core component parts, piezoelectric micro actuators and acceleration sensors, and pyroelectric infrared sensors and infrared sensing devices. The PZT-PVDF composite solution according to the present invention is characterized in that the PZT-PVDF composite solution is composed of PVDF: 10 to 30% by weight, PZT powder: 5 to 40% by weight and the remaining mixed solvent. PZT powder is characterized in that the addition of 10 to 25% by weight of the total weight of the PZT-PVDF composite solution. In the above content ratios, the PVDF and PZT content ratios are optimal for maintaining physical properties that can be configured in the form of films and membranes while maintaining ductility, and for enhancing the piezoelectric performance of generating vibration by supplying electricity. Finding rain is important. That is, if the content of PZT in the water treatment membrane according to the present invention is too high, the ductility may be insufficient to maintain the shape of the film or membrane. On the contrary, if the content of PVDF is too high, vibration efficiency may be lowered even when electricity is supplied. The fouling removal effect may be lowered.

The permit carrier 220 may be manufactured to correspond to the piezoelectric membrane 210 to be in contact with the upper portion of the piezoelectric membrane 210 and may be manufactured to have a compact structure of a set degree to increase the electrode efficiency of the piezoelectric membrane 210.

The feed spacer 230 is manufactured to correspond to the piezoelectric membrane 210, and one surface of the feed spacer 230 is a conductive and porous support contacting the lower portion of the piezoelectric membrane 210. The fouling phenomenon can be prevented. Specifically, the pore size of the feed spacer 230 is manufactured so as not to affect the membrane fouling phenomenon, it may be at least 0.2 um.

The permit carrier 220 and the feed spacer 230 may be made of titanium, which is light and durable in a mesh shape.

The concentrate pressure measuring unit 300 may be installed at the outlet 50 of the assembly main body 100 to measure and control the pressure of the concentrate introduced into the assembly main body 100.

The concentrate pressure measuring unit 300 may include a pressure gauge 310 and a control valve 320.

The pressure gauge 310 may measure and display the pressure of the concentrate contained in the assembly body 100.

The control valve 320 may be connected to the pressure gauge 310 to control the pressure in the assembly main body 100 by controlling the discharge of the concentrate while monitoring the amount of the concentrate introduced into the assembly main body 100.

The piezoelectric separator assembly 10 of the present invention may further include an o-ring 400 and a shim 500.

The O-ring 400 is inserted between the upper plate member 110 and the lower plate member 120 while filling the gap between the upper plate member 110 and the lower plate member 120 when the upper plate member 110 and the lower plate member 120 are coupled to each other. Watertightness can be enhanced. Specifically, the material of the O-ring 400 may be manufactured using a light and excellent silicon.

Shim 500 may be inserted into the lower portion of the membrane unit 200 in the assembly body 100 to enhance the adhesion of the membrane module to improve the piezoelectric effect and water tightness. Specifically, the material of the shim can be manufactured using light synthetic resin or synthetic rubber with excellent durability.

In addition, the piezoelectric separator assembly 10 of the present invention has a permit outlet capable of communicating the outside and the permit carrier 220 to control the pressure acting on the permit carrier 220 to a part of the upper plate member 110. Can be formed. Therefore, it is possible to discharge the pressure applied to the permit carriers 220 through the permit outlets.

The detailed description of the preferred embodiments of the invention disclosed as described above is provided to enable those skilled in the art to implement and practice the invention. Although the above has been described with reference to preferred embodiments of the present invention, those skilled in the art will understand that various modifications and changes can be made without departing from the scope of the present invention. For example, those skilled in the art can use each of the components described in the above-described embodiments in combination with each other. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

The invention can be embodied in other specific forms without departing from the spirit and essential features of the invention. Accordingly, the above detailed description should not be interpreted as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention. The present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. In addition, the claims may be incorporated into claims that do not have an explicit citation relationship in the claims, or may be incorporated into new claims by amendment after filing.

10: assembly
30: Permit Outlet
50: outlet
70: inlet
100: assembly body
110: top plate member
120: lower plate member
130: coupling member
132; Post
134; Post Guide
200: membrane unit
210: piezoelectric membrane
220: permit carrier
230: Feed spacer
300: concentrate pressure measuring unit
310: pressure gauge
320: control valve
400: O-ring
500: Sim

Claims (8)

A piezoelectric separator assembly for generating vibration through electricity,
An assembly main body connected to an external power source so that electricity is supplied thereto and an inlet and an outlet through which a fluid flows in and out;
A membrane unit accommodated in the assembly body and generating vibration by a piezoelectric effect using electricity transferred from the power source; And
And a concentrate pressure measuring unit installed at an outlet of the assembly main body to measure and control the pressure of the concentrate introduced into the assembly main body.
The membrane unit,
Prevent the fouling phenomenon by making the pores formed in the portion to a predetermined size,
The membrane unit,
A piezoelectric membrane on which a web made by PZT-PVDF composite solution is electrospun;
A permit carrier manufactured to correspond to the piezoelectric membrane to be in contact with an upper portion of the piezoelectric membrane and to have a compact structure of a predetermined degree for increasing electrode efficiency of the piezoelectric membrane; And
A feed spacer fabricated corresponding to the piezoelectric membrane and coated with an insulating and waterproof material on one surface thereof with a conductive and porous support contacting the lower portion of the piezoelectric membrane, and formed of pores having a predetermined size to prevent fouling; Piezoelectric membrane assembly improved watertightness comprising a.
The method according to claim 1,
The assembly body,
An upper plate member having a first connection hole communicating with an electric line connected to the power source at a portion thereof;
A lower plate member manufactured to correspond to the upper plate member and provided with a portion of the inlet port and an outlet port, the lower plate member detachably coupled to the upper plate member in a state in which a second connection hole corresponding to the first connection hole is formed; And
And a coupling member formed at a corresponding portion of each of the upper plate member and the lower plate member to couple the upper plate member and the lower plate member to each other through a bolted coupling method.
delete The method according to claim 1,
The concentrate pressure measuring unit,
A pressure gauge for measuring and displaying the pressure of the concentrate contained in the assembly body; And
And a control valve connected to the pressure gauge to control the pressure inside the assembly body by controlling the discharge of the concentrate while monitoring the amount of the concentrate introduced into the assembly main body. Assembly.
The method according to claim 1,
The permit carrier and the feed spacer are piezoelectric separator assembly having improved water-tightness, characterized in that the mesh is made of titanium.
The method according to claim 2,
O-ring is inserted between the upper plate member and the lower plate member to enhance the watertightness while filling the gap between the upper plate member and the lower plate member when the upper plate member and the lower plate member is coupled; Blee.
The method according to claim 6,
The material of the O-ring is silicon; piezoelectric membrane assembly improved water tightness.
The method according to claim 1,
And a shim inserted into a lower portion of the membrane module in the assembly body to enhance the adhesion of the membrane unit to improve the piezoelectric effect and the watertightness.

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