CN203264564U - Defect detecting device for hollow fiber membrane module - Google Patents

Abstract

The utility model provides a defect inspection device for a hollow fiber membrane module, which does not require frequent replacement of sealing parts. The defect inspection device of the hollow fiber membrane module of the utility model is a defect inspection device of the hollow fiber membrane module (18) in which the hollow fiber membrane bundle with one end opening is fixed in the cylindrical casing (10) by using a fixing resin, and is characterized in that , has: a bracket (68), which has a recess that can be inserted into one end side of the cylindrical casing; an exhaust pipe (56), one end of which is opened on the bottom surface of the recess, and communicates the recess with the suction device; the measuring mechanism ( 54) which measures the amount of microparticles in the gas sucked from the recess by the suction device; the ring-shaped sealing gasket (70) of soft resin is arranged so as to surround the opening of the exhaust duct on the bottom surface of the recess, and is inserted into the The end surface of the cylindrical case of the hollow fiber membrane module that enters the concave portion abuts against.

Description

Defect Inspection Device for Hollow Fiber Membrane Modules

technical field

Generally speaking, the utility model relates to a defect inspection device of a hollow fiber membrane module. Check the device.

Background technique

In recent years, in households and the like, water purifiers for purifying tap water are generally used. In such a water purifier, for example, a hollow fiber membrane module 18 ( FIG. 1 ) is used as a filter material in a cylindrical case 10 . As for the hollow fiber membrane module 18 , the cylindrical body 14 of the hollow fiber membrane 12 One end 14a is fixed by adhesive 16.

In the case of manufacturing such a hollow fiber membrane module 18, first, after the hollow fiber membrane 12 is folded back at a certain length several times to form a plate shape, a textile fiber 20 such as polyester filament yarn is used. The parts near both ends of the hollow fiber membrane 12 are braided to form a long braided fabric 22 ( FIG. 2 ).

Next, the elongated braided fabric 22 is cut into a predetermined length, and the elongated braided fabric 22 is wound in a direction perpendicular to the longitudinal direction of the hollow fiber membrane 12 to form a cylinder 14 ( FIG. 3 ).

Then, the cylinder 14 is housed in the bottom of a cylindrical case closed at one end with a bottom plate, and a liquid resin is filled into the bottom of the cylindrical case 10, thereby forming an adhesive on the bottom of the cylindrical case ( cured resin) layer 16.

Then, by cutting the bottom of the cylindrical case, a hollow fiber membrane module 18 ( FIG. 1 ) is obtained in which the hollow fiber membrane is opened at one end side.

In this hollow fiber membrane module 18, since the adhesive (cured resin) layer 16, which is the resin fixing portion of the cylindrical body fixing the hollow fiber membranes, separates the raw water before passing through the hollow fiber membranes and the net water after passing through the hollow fiber membranes. Since there is a part of water, if a leak occurs in this part, the hollow fiber membrane module cannot exhibit the desired purification performance.

In the case where the hollow fiber membrane itself has defects such as small holes, leakage occurs at the small holes, so that the hollow fiber membrane module cannot exhibit desired purification performance.

Therefore, it is necessary to exclude the hollow fiber membrane modules that have leaked, and after the manufacturing process of the hollow fiber membrane modules as described above is completed, a defect inspection ( leak check).

As this kind of leakage inspection, the following method is known: by introducing gas or liquid containing fine particles or turbidity into the primary side of the hollow fiber membrane, and using a dust particle counter or a turbidity meter to measure the amount of air passing through the hollow fiber membrane. The presence or absence of leakage is judged by the number of fine particles or turbidity of the permeated gas or permeated liquid on the secondary side (for example, Patent Document 1).

prior art literature

patent documents

Patent Document 1: Japanese Patent Laid-Open No. 2009-291787

Utility model content

In such a leak inspection, a defect inspection device 100 whose schematic configuration is shown in FIG. 4 is used.

This defect inspection device 100 includes a plurality of (three in this example) gas collecting seats 30 - 1 , 30 - 2 , and 30 - 3 inserted into the lower end portion of the hollow fiber membrane module 18 to be inspected. Each of the air collecting seats 30-1, 30-2, and 30-3 has a cylindrical inner space S opened toward the upper end. The inner space S of each gas collection seat 30-1, 30-2, 30-3 is the space where the lower end part of the hollow fiber membrane module 18 is inserted, and the exhaust channel 34 and the exhaust gas flow through the on-off valve 32a, 32b are installed. The vacuum pump P for gas and the particle measuring device 36 are connected. The microparticle measuring device 36 is connected to the control unit 35 and the determination unit 40 .

In this defect inspection device 100 , the lower end portion of the hollow fiber membrane module 18 is inserted into the internal space S, and the air in the internal space S of the gas collection seat 30 is sucked into the particle measuring device 36 by the pump of the particle measuring device 36 . , the air containing fine particles (ordinary air) flows into the hollow fiber membrane module 18 from the open end of the hollow fiber membrane module 18 as indicated by arrow A. Then, the amount of fine particles in the air passing through the hollow fiber membrane module is measured by the fine particle measuring device 36 , thereby determining whether there is leakage in the hollow fiber membrane module 18 .

For each gas collecting seat 30-1, 30-2, 30-3, the above judgments are performed in sequence.

First, it is judged (inspected) whether the hollow fiber membrane module 18 inserted into the first gas collecting seat 30 - 1 has a leak.

The leakage judgment (inspection) of the hollow fiber membrane module 18 inserted into the first gas collection seat 30-1 is when the exhaust channels connected to the second and third gas collection seats 30-2 and 30-3 are locked. 34 in the state of opening and closing valves 32a, 32b.

Insert the hollow fiber membrane module 18 into the first gas collection seat 30-1. Next, open the on-off valve 32a provided on the exhaust passage 34 connecting the first gas collection base 30-1 and the vacuum pump P, and close the exhaust valve 32a provided on the exhaust passage 34 connecting the first gas collection base 30-1 and the particle measuring device 36. In the state of the on-off valve 32b of the gas passage 34, the vacuum pump P is operated for a predetermined time to discharge the residual gas in the exhaust passage 34 and the internal space S.

Then, lock the on-off valve 32a provided on the exhaust passage 34 connecting the first gas collecting base 30-1 and the vacuum pump P, and open the exhaust valve 32a provided on the connecting first gas collecting base 30-1 and the particle measuring device 36. The opening and closing valve 32b of the channel 34 operates the pump of the particle measuring device 36 to depressurize the internal space S, so that the air containing the particles (normal air) is discharged from the hollow fiber membrane module as indicated by the arrow A. The open end of 18 flows into the hollow fiber membrane module 18.

Then, the number of particles in the air passing through the hollow fiber membrane module 18 inserted in the first air collecting seat 30-1 is measured by the particle measuring device 36, thereby checking the hollow fiber membrane inserted in the first air collecting seat 30-1. Whether the fiber membrane module 18 is leaking.

In addition, the leakage judgment (inspection) of the hollow fiber membrane module 18 inserted into the second gas collection seat 30-2 is carried out in the following manner: between the first and third gas collection seats 30-1, 30 -3 In the state of the opening and closing valves 32a and 32b of the exhaust passage 34 connected to the first air collection seat 30-2, the hollow fiber membrane module 18 inserted into the second air collection seat 30-2 is connected The same operation is performed for the leakage judgment (inspection) of the hollow fiber membrane module 18 in 1.

Furthermore, the leakage judgment (inspection) of the hollow fiber membrane module 18 inserted into the third gas collection seat 30-3 is carried out in the following manner: between the first and second gas collection seats 30-1, 30-2 connected to the state of the opening and closing valves 32a, 32b of the exhaust passage 34, the hollow fiber membrane module 18 inserted into the third gas collection seat 30-3 is inserted into the first gas collection seat 30 - The same operation as the leakage judgment (inspection) performed by the hollow fiber membrane module 18 in -1.

In this leakage inspection, since it is necessary to seal the internal space S during the inspection, O-rings 38 are installed on the inner walls of the air collecting seats 30-1, 30-2, and 30-3, and are configured to be inserted into the inner space S as the inspection object. When using the hollow fiber membrane module 18, the gap between the outer peripheral surface of the hollow fiber membrane module 18 and the inner peripheral surface of the gas collection seats 30-1, 30-2, 30-3 is sealed.

However, in this defect inspection device, there is the following problem: Since the O-ring 38 is connected with The outer peripheral surface of the hollow fiber membrane module 18 is rubbed, so the O-ring 38 is worn prematurely and needs to be replaced frequently.

The utility model is proposed in view of the above problems, and the purpose of the utility model is to provide a hollow fiber membrane module defect inspection device that does not require frequent replacement of sealing members.

According to the utility model, a defect inspection device for a hollow fiber membrane module is provided. The hollow fiber membrane module uses a fixing resin to fix a hollow fiber membrane bundle with one end open in a cylindrical casing. The defect inspection device for the above hollow fiber membrane module Characterized by having:

a bracket having a recess capable of being inserted into one end side portion of the cylindrical case;

an exhaust duct, one end of which is open on the bottom surface of the recess, and communicates the recess with the suction device;

a measurement mechanism for measuring the amount of fine particles in the gas sucked from the recess by the suction device;

A ring-shaped gasket made of soft resin disposed so as to surround the opening of the exhaust duct on the bottom surface of the recess and to abut against the end surface of the cylindrical casing of the hollow fiber membrane module inserted into the recess. .

According to this configuration, since the gasket between the bracket of the seal defect inspection device and the hollow fiber membrane module has a size and shape that abuts against the end surface of the cylindrical case, and the gasket is provided in the concave portion of the bracket, each When the hollow fiber membrane module is assembled and disassembled with respect to the bracket, it is possible to avoid friction between the sealing gasket and the side wall of the cylindrical shell of the hollow fiber membrane module, which will cause the sealing gasket to be worn prematurely.

In addition, inspection of hollow fiber membrane modules of different sizes is possible only by replacing gaskets of different sizes.

Also, the force required to remove the hollow fiber membrane module is also small.

According to other preferred solutions of the present utility model, the soft resin is silicone rubber.

According to this configuration, it is possible to relatively reliably seal between the silicon gasket having high elasticity and the cylindrical case.

According to another preferred aspect of the present invention, the defect inspection device for the hollow fiber membrane module further includes a pressing mechanism that presses the hollow fiber membrane module toward the bottom surface of the recess, and the hollow fiber membrane module holds the cartridge One end side portion of the shape housing is inserted into the recess.

According to this configuration, it is possible to relatively reliably seal between the silicon gasket having high elasticity and the cylindrical case.

According to another preferred solution of the present invention, the defect inspection device of the hollow fiber membrane module is provided with a plurality of the brackets, and simultaneously sucks from the plurality of brackets.

According to this structure, defect inspection of a large number of hollow fiber membrane modules can be performed in a short time.

Effect of the present utility model is as follows.

According to the present invention, it is possible to provide a hollow fiber membrane module defect inspection device that does not require frequent replacement of sealing members.

Description of drawings

FIG. 1 is a cross-sectional view of an example of a hollow fiber membrane module inspected by a defect inspection device according to a preferred embodiment of the present invention.

Fig. 2 is a plan view of a long braided hollow fiber membrane used in the hollow fiber membrane module of Fig. 1 .

Fig. 3 is a perspective view of a cylinder of hollow fiber membranes assembled in the hollow fiber membrane module of Fig. 1 .

Fig. 4 is a schematic diagram showing the configuration of a conventional hollow fiber membrane module defect inspection device.

FIG. 5 is a schematic diagram showing the configuration of a defect inspection device according to a preferred embodiment of the present invention.

Fig. 6 is a schematic cross-sectional view illustrating the structure of a gas collecting seat used in the defect inspection device of Fig. 5 .

In the picture:

18—hollow fiber membrane module, 18a—one end of hollow fiber membrane module, 50—defect inspection device, 52—air collecting seat, 68—recess, 70—silicon gasket, 72—press mechanism.

Detailed ways

Next, a defect inspection device for a hollow fiber membrane module according to a preferred embodiment of the present invention will be described with reference to the drawings.

FIG. 5 is a schematic diagram showing the configuration of a hollow fiber membrane module defect inspection device 50 according to a preferred embodiment of the present invention.

It can be clearly seen from FIG. 5 that the defect inspection device 50 is a defect inspection device capable of inspecting three hollow fiber membrane modules 18 as shown in FIG. 1 at the same time. The defect inspection device 50 includes three air collecting seats 52 into which the end (one end) on the side of the adhesive (cured resin) layer 16 serving as the resin fixing portion of the hollow fiber membrane module 18 is inserted.

The defect inspection device 50 is equipped with: a particle measuring device 54, which measures the number of particles in the gas; a vacuum pump P for exhaust; a plurality of ventilation channels 56, which connect each gas collecting seat 52 and the particle measuring device 54; Air flow path 58, which is branched from the way of each ventilation flow path 56, and is connected with a vacuum pump; the ventilation side opening and closing valve 60, which is arranged on the ventilation flow path 56, is located at the junction of the ventilation flow path 56 and the exhaust flow path 58. Downstream of the branch point; the exhaust side on-off valve 62, which is installed on the exhaust flow path 58, is located downstream of the branch point between the ventilation flow path 56 and the exhaust flow path 58; the particle measuring device 54; the vacuum pump P; the control part 64, which is electrically connected to the ventilation side on-off valve 60 and the exhaust side on-off valve 62, and controls both; The quality of the hollow fiber membrane module 18 is judged by the number of fine particles in the measured gas.

FIG. 6 is a schematic cross-sectional view illustrating the structure of the gas collecting seat 52 . As shown in FIG. 6 , the gas collecting seat 52 is a bottomed cylindrical member that opens upward, and a columnar recess 68 is defined by an annular peripheral wall 52 a. The cylindrical recess 68 has a size capable of being inserted into the one end 18 a side part of the hollow fiber membrane module 18 .

A ring-shaped gasket 70 made of soft resin is attached to the bottom surface 68 a of the cylindrical recess 68 . As shown in FIG. 6 and the like, the silicon gasket 70 is formed in such a size that it comes into contact with the annular front end surface 10a of the tubular casing 10 inserted into the cylindrical recess 68 on the side of the one end 18a of the hollow fiber membrane module 18. .

Examples of the soft resin used for the gasket 70 include silicone rubber, nitrile rubber, styrene rubber, fluororubber, soft vinyl chloride resin, ABS, soft acrylic resin, and the like. In this embodiment, silicone rubber is used. Comes as gasket 70.

On the bottom surface 68 a of the concave portion 68 , a vent hole 68 b communicating with the exhaust passage 56 is formed in a region surrounded by an annular silicon packing 70 .

The defect inspection device 50 further includes an annular pressing mechanism 72 that abuts on the annular opening end of the hollow fiber membrane module 18 whose one end side is partially inserted into the concave portion 68 of the gas collecting seat 52 , and faces toward the concave portion 68 . The bottom surface 68a of the hollow fiber membrane module 18 is pressed.

In addition, the particle measuring device 54 is a particle measuring device such as a dust particle counter that includes a suction pump inside and can measure the size and number of particles in the gas. An example of a dust particle counter is a device that continuously measures the size and number of fine particles in a floating state using a light scattering method. From the perspective of sensitivity for detecting microparticles, it is preferable to use a device with a maximum concentration of 10,000 particles/liter or more.

As for the ventilation flow path 56 , the starting end is connected to the ventilation hole of the gas collecting base 52 , joins with other ventilation flow paths 56 on the way, and the terminal is connected to the microparticle measuring device 54 . The piping is preferably a tube made of a material with excellent inner surface smoothness, pressure resistance, and durability. From the perspective of reducing the stagnant volume of the gas to be measured, the responsiveness of switching the object to be measured, and the reduction of the suction resistance (pressure loss) of the dust particle counter, the length of the piping (from the gas collecting seat 52 to the particle measurement The flow path length up to the device 54) is preferably 2 m or less, more preferably 0.5 m or less.

The exhaust flow path 58 branches off from the ventilation flow path 56 , joins with another exhaust flow path 58 on the way, and terminates at the vacuum pump P. As shown in FIG.

As the ventilation-side on-off valve 60 and the exhaust-side on-off valve 62 , it is preferable to use a valve having a good sealing performance when the valve is closed and a low dust generation during the opening and closing operation, for example, a pinch valve.

The control unit 64 has a processing unit and an interface unit, and controls the start/stop of the operation of the suction pump of the particle measuring device 54, the start/stop of the operation of the vacuum pump P, and the opening and closing of the ventilation side on-off valve 60 and the exhaust side on-off valve 62. Open and close etc.

A specific ventilation flow path 56 can be selected by the control unit 64 opening only one ventilation-side on-off valve 60 among the plurality of ventilation-side on-off valves 60 and closing the other ventilation-side on-off valves 60 . That is, the combination of the plurality of vent-side on-off valves 60 and the control unit 64 functions as a flow path switching mechanism.

The interface part of the control part 64 electrically connects the on-off valve provided in each flow path and each pump, and a processing part. The processing unit controls the opening and closing of the on-off valves provided in each flow path and the start/stop of the operation of the pump based on the operation signal input to the processing unit.

The judging unit 66 roughly includes a processing unit and an interface unit, and judges the quality of the hollow fiber membrane module 18 based on the number of fine particles in the gas measured by the fine particle measuring device 54 .

The interface unit of the determination unit 66 electrically connects the particle meter 54 and the processing unit of the determination unit 66 . The processing unit judges whether the hollow fiber membrane module 18 is good or bad based on whether the data from the particle meter 54 (the number of particles in the gas) is more or less than the specified value, and displays the judgment on the display device (not shown). result.

In addition, these processing units can be realized by dedicated hardware, and these processing units can be composed of a memory and a central computing unit (CPU), and the program for realizing the function of the processing unit is loaded into the memory and the program is executed. The above-mentioned processing unit realizes its function.

In addition, an input device, a display device, and the like as peripheral devices are connected to the control unit 64 and the determination unit 66 . Here, the input device refers to an input device such as a liquid crystal touch panel, a switch panel, or a keyboard, and the display device refers to a CRT display or a liquid crystal display device.

Next, a defect inspection method of a hollow fiber membrane module using a defect inspection device will be described.

In this method, the defects of the three hollow fiber membrane modules 18 respectively inserted into the three gas collecting bases 52 are inspected at the same time.

First, the end portions 18 a on the adhesive (cured resin) layer side of the three hollow fiber membrane modules 18 are respectively inserted into the recesses 68 of the three gas collecting bases 52 . At this time, the annular front end surface of the cylindrical casing 10 of the hollow fiber membrane module 18 is brought into contact with the annular silicon gasket 70 attached to the bottom surface 68 a of the concave portion 68 .

Next, the pressing mechanism 72 is operated, and each hollow fiber membrane module 18 is pressed toward the bottom surface 68 a of the concave portion 68 , more specifically, toward the silicon gasket 70 . As a result, the space between the one end surface of each hollow fiber membrane module 18 and the bottom surface 68 a of the recess 68 is airtight.

Under the control of the control unit 64, each measurement on-off valve 60 provided on the exhaust path from each gas collection seat 52 to the particle measuring device 54 is closed, and the on-off valve provided to the vacuum pump P is opened. In the state of each exhaust-side on-off valve 62 of the exhaust path 58, the vacuum pump P is operated for a predetermined time to exhaust the space and the exhaust passage between one end surface of each hollow fiber membrane module 18 and the bottom surface 68a of the recess 68. 56 residual gas.

Next, the on-off valves 60 for measurement provided on the exhaust paths from the gas collection seats 52 to the particle measuring device 54 are opened, and the respective exhaust valves 60 provided on the exhaust paths 58 to the vacuum pump P are closed. The side opening and closing valve 62 operates the pump of the microparticle measuring device 54 to depressurize the space between one end surface of each hollow fiber membrane module 18 and the bottom surface 68a of the recess 68, so that the air containing the microparticles is depressurized as indicated by arrow A. It flows into the hollow fiber membrane module 18 from the open end of the hollow fiber membrane module 18 as shown. As the gas containing fine particles, air in the periphery of the defect inspection device is generally used.

In the microparticle measuring device 54 , the gas passing through the hollow fiber membrane is irradiated with light from a laser light source to measure the number of microparticles in the gas, and then the gas is discharged. The measured data related to the number of fine particles in the gas are sent to the judging unit 66 to judge whether the hollow fiber membrane module 18 is good or bad.

If the judgment result is bad, since a leak has occurred in one of the three hollow fiber membrane modules that were measured at the same time, the leakage of the three hollow fiber membrane modules that were measured at the same time was checked by using the above-mentioned method of checking the leakage of each hollow fiber membrane module. Each of the three hollow fiber membrane modules was individually inspected for leaks, thereby determining in which hollow fiber membrane module a leak occurred.

The present invention is not limited to the above-described embodiments, and various changes and modifications can be made within the scope of the technical idea described in the claims.

In the above-mentioned embodiment, although the hollow fiber membrane module shown in FIG. 1 was demonstrated as inspection object, this invention can also be applied to the hollow fiber membrane module of another type.

As the fine particle-containing gas that flows into the hollow fiber membrane module 18 when measuring the amount of fine particles in the gas, a gas containing fine particles of a predetermined particle size at a predetermined concentration can be used according to the specifications of the hollow fiber membrane module 18 .

In the above description, as the first stage, the leak inspection of three hollow fiber membrane modules was carried out simultaneously by using the defect inspection device of this embodiment. method.

Claims (5)

1. A defect inspection device for a hollow fiber membrane module, wherein the hollow fiber membrane module uses a fixing resin to fix a hollow fiber membrane bundle with one end open in a cylindrical casing, and the defect inspection device for the above hollow fiber membrane module is characterized in that it comprises : a bracket having a recess capable of being inserted into one end side portion of the cylindrical case; an exhaust duct, one end of which is open on the bottom surface of the recess, and communicates the recess with the suction device; a measuring mechanism that measures the amount of fine particles in the gas sucked from the recess by the suction device; and A ring-shaped gasket made of soft resin disposed so as to surround the opening of the exhaust duct on the bottom surface of the recess and to abut against the end surface of the cylindrical casing of the hollow fiber membrane module inserted into the recess. . 2. The defect inspection device for a hollow fiber membrane module according to claim 1, wherein: The soft resin is silicone rubber. 3. The defect inspection device for a hollow fiber membrane module according to claim 1 or 2, wherein: A pressing mechanism for pressing the hollow fiber membrane module into which the one end side portion of the cylindrical case is inserted into the concave portion is further provided. 4. The defect inspection device for a hollow fiber membrane module according to claim 1 or 2, wherein: There are multiple brackets, Simultaneously, suction is performed from a plurality of said holders. 5. The defect inspection device for a hollow fiber membrane module according to claim 3, wherein: There are multiple brackets, Simultaneously, suction is performed from a plurality of said holders.

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