CN114130205A - Rapid and accurate detection equipment and method for hollow fiber membrane performance - Google Patents

Abstract

The invention discloses a device and a method for quickly and accurately detecting the performance of a hollow fiber membrane. The detection equipment comprises at least one test unit, a pressure fluid input system and a pressure fluid output pipeline, wherein the test unit is internally provided with a sealed air device for fixing the membrane wires to be detected, the pressure fluid input system is directly connected with one end of the test unit, and the pressure fluid output pipeline is arranged at the other end of the test unit. The invention breaks through the limitation that the film yarn detection equipment in the past must use strings to bind or glue when connecting the film yarn sample to be detected, and greatly improves the timeliness of the film yarn detection while ensuring the detection accuracy. A specially designed sealing device is adopted, so that the process of preparing a sample for membrane yarn detection is omitted, the detection cost is saved, and the detection accuracy is ensured; the invention can be simply and rapidly installed and sealed, greatly improves the film performance detection speed and efficiency, and is beneficial to the management and control of the film product quality of a production line.

Description

Rapid and accurate detection equipment and method for hollow fiber membrane performance

Technical Field

The invention relates to the field of hollow fiber membrane performance detection, in particular to a device and a method for rapidly detecting the performance of a hollow fiber membrane. The detection equipment is particularly suitable for quickly and accurately detecting the performance of the lining hollow fiber composite membrane.

Background

With the rapid development of national economy and the continuous improvement of the living standard of people, the requirements on the environment, particularly the water environment safety, are higher and higher. In order to obtain more stable and higher effluent quality, membrane water treatment technology is increasingly adopted in sewage treatment and drinking water treatment processes. The application of the hollow fiber ultra/micro-filtration membrane is more and more extensive, and the lining reinforced hollow fiber composite membrane with higher mechanical strength and longer service life is rapidly developed by virtue of the superior performance. With the continuous increase of the yield of the hollow fiber membrane, the quality of the membrane is strictly controlled in the production process, and higher requirements are provided for the rapid detection technology of the performance of the hollow fiber membrane. The faster the membrane performance is detected, the faster the quality control reaction in the production process is, and the more stable the performance and quality of the membrane is.

As shown in fig. 1a, the lining hollow fiber composite membrane (abbreviated as membrane filament in the industry) mainly comprises a coated surface separation layer 010 and a braided tube 020 or other types of supporting materials, which are respectively used for the functions of separating and supporting strength. The surface separation layer 010 is a filtration membrane having a microporous structure, and water cannot pass through the membrane without being pressurized. The inner woven tube 020 or support layer is woven from polymer fibers, and the wall has large pore spaces, so that water can easily flow in the radial direction and the axial direction. At present, the method for connecting membrane threads to equipment for rapidly measuring membrane performance (including membrane flux, membrane bubble point and the like) generally adopts the steps that a needle tube is inserted into an inner hole of the membrane thread, and the end of the membrane thread is tightly tied on a needle head by a thin rope so as to achieve the sealing effect. Because the inner braided tube wall body has large hole clearance and larger thickness (about 0.5-2 mm), effective sealing cannot be obtained, and particularly, water flows can flow out of the braided tubes at two ends of the membrane wire when water is used for pressurization in detection, so that the membrane performance cannot be accurately obtained. In order to overcome the defect, sealing glue is adopted to strengthen the sealing, namely, the membrane wires are glued with the test pipeline, so that a good sealing effect can be obtained. However, glue needs to be cured for a certain time, and a test sample needs to be prepared in advance, so that the detection timeliness is affected, and the requirement for rapid detection of the film yarn performance on a production line cannot be met. As shown in fig. 1b, the detection of the hollow fiber membrane (abbreviated as membrane filament in the industry) without the braided tube lining also has some difficulties, and if the hollow fiber membrane is sealed by glue, the detection is time-consuming and cannot provide rapid detection; if the rope is adopted for binding, because of manual binding, the strength is difficult to control, the strength is insufficient, the sealing is not firm, and the risk of being flushed out by water pressure exists; too much force may cause membrane threads to be torn.

So far, the rapid detection of the membrane filaments always has the condition that the timeliness and the accuracy are difficult to be considered, so that the detection equipment for preparing the hollow fiber membrane filaments can simply, conveniently and rapidly connect a membrane filament sample to be detected and can obtain a reliable sealing effect, thereby accurately measuring the performance of the membrane filaments and being more and more important for producing the hollow fiber membranes with stable and reliable quality. A hollow fiber membrane detection device with detection timeliness and accuracy has important significance for research and development and production of hollow fiber membranes.

Disclosure of Invention

The invention provides the detection equipment and the detection method for the performance of the hollow fiber membrane, which are simple and quick to install and accurate and reliable in detection result, and aims to solve the problem that the detection equipment for the performance of the conventional hollow fiber membrane (membrane yarn in the industry) is difficult to realize both timeliness and accuracy of detection. The detection equipment can improve the detection speed and accuracy of the membrane silk performance, and provides guarantee for the control of the membrane silk quality in the membrane silk production process, so that the product quality and the market competitiveness are improved.

The invention provides equipment for quickly and accurately detecting the performance of a hollow fiber membrane, which comprises at least one testing unit, a pressure-adjustable fluid input system and a pressure fluid output pipeline, wherein the testing unit is internally provided with a sealing device for fixing a membrane wire to be detected, the pressure-adjustable fluid input system is directly connected with one end of the testing unit, and the pressure fluid output pipeline is arranged at the other end of the testing unit.

Preferably, the sealing device comprises a tubular housing, a tubular sealing mechanism arranged in the housing, and a connecting mechanism for fixing the sealing mechanism in the housing; the top of the shell and the top of the corresponding sealing mechanism are provided with through holes for inserting one end of the membrane wire to be tested into the sealing mechanism, and the lower port of the sealing mechanism is sealed by a sealing ring; the connecting mechanism comprises a base in threaded connection with an inner hole at the lower end of the shell and a needle tube arranged in the middle of the base, wherein one end of the needle tube is communicated with the outside, and the other end of the needle tube penetrates through the sealing ring to be inserted into the sealing mechanism and is communicated with an inner hole of the membrane wire to be detected; and after the shell is screwed with the base, the inner surface of the base abuts against the outer end surface of the sealing ring.

Preferably, the pressure fluid is gas or liquid; the test unit is a water tank, and the two transverse ends in the water tank are respectively provided with a sealing device for fixing the membrane wires to be tested; the pressure fluid input system comprises a first pipeline for inputting pressure liquid into an inner hole at one end of the membrane wire to be detected, and a total water valve, a flowmeter, a water pressure meter and an inlet valve which are sequentially arranged on the first pipeline; the second pipeline is connected with the first pipeline in parallel and used for inputting pressure gas, and the pressure reducing valve, the air pressure gauge and the master air valve are sequentially arranged on the second pipeline.

Preferably, the output pipeline comprises an internal pressure cross-flow water outlet pipe communicated with an inner hole at the other end of the membrane wire to be detected, and the cross-flow water outlet pipe is provided with an internal pressure outlet valve; and the internal pressure water collecting outlet pipe is arranged on the lower side of the test unit and is provided with an internal pressure water collecting valve.

Preferably, the water tank is provided with a sealing cover; and a bypass for external pressure test is arranged on the first pipeline between the water pressure meter and the inlet valve, a water inlet valve is arranged on the bypass, and the bypass is communicated with the water pool.

Preferably, the output pipeline further comprises an external pressure cross flow water outlet pipe communicated with the water pool, and an external pressure outlet valve is arranged on the external pressure cross flow water outlet pipe; and an external pressure water collecting outlet pipe with an external pressure water collecting valve is also bypassed on the internal pressure cross flow outlet pipe.

The invention also provides a test method for the rapid and accurate detection equipment using the hollow fiber membrane performance, which comprises the following basic steps: respectively installing and fixing two ends of a membrane wire to be tested on a sealing device in the test unit; and respectively selecting membrane flux or membrane bubble points of a membrane filament internal pressure test mode or selecting membrane flux of a membrane filament external pressure test mode according to the detection items of the membrane filament performance.

Preferably, the membrane flux of the membrane filament internal pressure mode is tested by the following steps:

selecting corresponding pressure liquid and a test waterway for testing, controlling a relevant valve on the test waterway, inputting the pressure liquid into the inner cavity of the membrane wire to be tested, enabling the flow and the pressure of the pressure liquid to reach the set values of the test, and starting to time the prepressing time;

and when the running of the equipment reaches the set pre-pressing time, starting to collect the filtered liquid output by the test unit, and when the set filtering time is reached, finishing the collection, and finally calculating the membrane flux of the internal pressure mode of the membrane filaments to be tested.

Preferably, the bubble point of the test membrane thread comprises the following steps:

selecting corresponding pressure gas for testing and a testing gas circuit, controlling and adjusting a relevant valve on the testing gas circuit, and enabling the pressure of the pressure gas to reach a set value for testing; filling clear water into the test unit until the membrane filaments to be tested are submerged, and inputting the pressure gas into the inner cavity of the membrane filaments to be tested;

when bubbles appear on the surface of the membrane wire to be detected, recording the pressure value of the pressure gas at the moment as a maximum bubble point; and recording the pressure value of the pressure gas at the moment when a large number of bubbles appear on the surface of the membrane wire to be detected suddenly, wherein the pressure value is the average bubble point.

Preferably, the membrane flux of the external pressure mode of the membrane filament is tested by the following steps:

sealing the test unit by using a sealing cover to ensure that the test unit is well sealed;

selecting corresponding pressure liquid and a test waterway for test, controlling a relevant valve on the test waterway, and directly inputting the pressure liquid into the inner cavity of the test unit; and the flow and the pressure of the pressure liquid reach the testing set values;

and after the external pressure water collecting outlet pipe communicated with the inner hole of the membrane wire to be detected in the output pipeline begins to discharge water, allowing the pressure liquid to run for a set pre-pressing time, beginning to collect the filtered liquid output by the external pressure water collecting outlet pipe, and after the set filtering time is reached, ending the collection, and finally calculating the membrane flux of the membrane wire to be detected in an external pressure mode.

Compared with the prior art, the invention has the following beneficial effects:

the invention can test various membrane performances simultaneously by integrating the water path of the membrane flux test of the membrane filaments and the gas path of the membrane bubble point test; and through modular design and assembly, a plurality of membrane yarn samples can be tested simultaneously, the membrane yarn testing time is greatly shortened, the detection accuracy is ensured, the timeliness of membrane yarn detection is greatly improved, and the most powerful basis is provided for factory production management and product research and development. The invention breaks through the limitation that the traditional membrane silk detection equipment must be bound by a string or glued by glue when being connected with a membrane silk sample to be detected, adopts a specially designed sealing device, omits the process of preparing the sample for membrane silk detection, saves the detection cost and ensures the detection accuracy; the invention can be simply and rapidly installed and sealed, greatly improves the film performance detection speed and efficiency, and is beneficial to the management and control of the film product quality of a production line.

Drawings

FIGS. 1a and 1b are schematic structural views of a lining hollow fiber composite membrane and an unsupported hollow fiber membrane, respectively;

FIG. 2 is a schematic view of a sealing device according to the present invention;

FIG. 3 is a schematic diagram of a first embodiment of a membrane flux, bubble point apparatus for detecting the internal pressure mode of a membrane filament;

FIG. 4 is a schematic diagram of a second embodiment of a membrane flux, bubble point apparatus capable of simultaneously detecting internal pressure patterns of a plurality of membrane filaments;

FIG. 5 is a schematic view showing a third example of a membrane flux apparatus for detecting membrane flux in an internal pressure mode, a membrane bubble point and an external pressure mode of one membrane filament;

FIG. 6 is a schematic view of a fourth embodiment of a membrane flux apparatus capable of simultaneously detecting membrane flux in an internal pressure mode, a membrane bubble point and an external pressure mode of a plurality of membrane filaments.

Detailed Description

The invention is further illustrated by the following examples and figures.

Referring to fig. 4, the apparatus for rapidly and accurately detecting the performance of a hollow fiber membrane generally includes one or more parallel test units 100, which are containers, and sealing devices for fixing the performance of the hollow fiber membrane (membrane filaments) to be detected are disposed inside the test units. The pressure-adjustable test device also comprises a pressure fluid input system 200 which is directly connected with the left ends of all the test units and can adjust pressure, and an output pipeline 300 which is arranged at the right end of each test unit and used for outputting the pressure fluid. Namely, pressure fluid passes through the membrane wire to be tested, and finally, performance parameters of the membrane wire to be tested, such as membrane flux and membrane bubble point, are measured according to the condition of the fluid permeated by the membrane wire to be tested.

FIG. 1a is a schematic structural view of a composite membrane lined with hollow fibers; FIG. 1b is a schematic structural view of a hollow fiber membrane without a support liner. Both of these structures of membrane filaments can be used as the membrane filaments to be tested in the present invention.

As shown in fig. 2, the sealing device specially manufactured according to the present invention includes a tubular housing 04, a tubular sealing mechanism 03 disposed in the housing, and a connecting mechanism for fixing the sealing mechanism in the housing 04. The top of the shell and the top of the corresponding sealing mechanism are provided with through holes for inserting one end of the membrane wire 05 to be detected into the sealing mechanism 03, and the lower port of the sealing mechanism is sealed by a sealing ring 02. the connecting mechanism comprises a base 01 in threaded connection with an inner hole at the lower end of the shell 04 and a needle tube 06 arranged at the middle part of the base and capable of being communicated with the outside, and the upper end of the needle tube penetrates through the sealing ring 02 to be inserted into the sealing mechanism 03 and is communicated with the inner hole of the membrane wire 05 to be detected. When the shell 04 is screwed with the base 01, the inner surface of the base 01 abuts against the outer end surface of the sealing ring 02. Sealing mechanism 03 of one end can be fixed with the one end of the membrane silk 05 that awaits measuring on the one hand like this, and sealing mechanism at both ends alright will await measuring the both ends of membrane silk respectively and fix. On the other hand, a sealed space can be formed among the sealing mechanism 03, the membrane wire 05 to be tested, the needle tube 06 and the sealing ring 02, namely, during testing, when pressure fluid used for testing axially enters the sealed space through the wall body of the membrane wire 05 to be tested and is filled with the pressure fluid, the pressure fluid used for testing cannot leak to the two ends of the membrane wire to be tested any more, and the pressure fluid can only radially permeate through the wall body of the membrane wire 05 to be tested which is not wrapped by the inner circle 03 of the sealing mechanism.

Fig. 2 and 3 are schematic diagrams of a first embodiment of the membrane flux, bubble point apparatus of the present invention for detecting the internal pressure pattern of a membrane filament. Is also the basic structure of the detection device of the invention. The pressure fluid according to the invention is a pressure gas 11 and a pressure liquid 1, such as air, clean water. The test unit is a water tank 7, and sealing devices 6 for fixing the membrane filaments 05 to be tested are respectively arranged at the left end and the right end in the horizontal direction in the water tank 7. After the membrane wire 05 to be tested is fixed in the water tank 7 by the sealing device 6 provided by the invention, the needle tube 06 of the sealing device 6 at the two ends is communicated with the inner hole of the membrane wire 05 to be tested, and the needle tube 06 of the sealing device 6 is also communicated with the outside. The pressure-adjustable pressure fluid input system comprises a first pipeline 50 for inputting pressure fluid 1 for testing into an inner hole of a membrane wire 05 to be tested through a needle tube 06 of a sealing device 6 at the left end of a water tank 7, a total water valve 2, a flowmeter 3, a water pressure gauge 4 and an inlet valve 4 which are sequentially arranged on the first pipeline 50. The main water valve 2 is connected to the external pressure fluid, and the inlet valve 4 is connected to the needle tube 06 of the sealing device 6. A second line 60 for the supply of test gas 1 is also provided, which is connected in parallel to the first line 50 between the main water valve 2 and the flow meter 3. The second pipeline 60 is provided with a pressure reducing valve 12, a barometer 14 and a master gas valve 13 which are communicated with the external pressure gas 1 in sequence. Locate the output pipeline of 7 right-hand members in pond includes: an internal pressure cross flow water outlet pipe 70 communicated with an inner hole at the right end of the membrane silk 05 to be detected through a needle tube 06 of a sealing device 6 at the right end, wherein an internal pressure cross flow valve 9 is arranged on the internal pressure cross flow water outlet pipe 70; an inner pressure water collecting outlet pipe 80 with an inner pressure water collecting valve 10 arranged at the lower side of the water tank 7.

The pressure liquid 1 shown in fig. 3 was used to provide membrane filament membrane flux test use. The pressure liquid can be supplied by a pressure water tank or a water pump. The main water valve 2 is used for controlling the opening and closing of the pressure liquid. And the amount and pressure of the pressure liquid can be adjusted by the opening degree of the master water valve 2. The flow meter 3 is used to monitor the water flow of the pressure liquid. The inlet valve 4 is used for opening and closing the pressure fluid flowing through the membrane thread 05 to be tested. And the water quantity and the pressure of the membrane filaments to be measured can be adjusted through the opening of the valve. The water pressure gauge 5 is used for monitoring the liquid pressure of the membrane wire detection pipeline to be detected. The sealing device 8 is used for connecting the membrane wire 05 to be tested into a test pipeline and ensuring the sealing performance. The water tank 7 is used for containing clean water and filtered water. The internal pressure cross flow valve 9 is used for controlling the opening and closing of the test water channel outlet of the membrane wire 05 to be tested, so as to control the filtration mode of the membrane wire. Namely, the valve is in a dead-end filtration mode when closed; when the valve is opened, the cross-flow filtration mode is adopted; meanwhile, the water flow meter is matched with the main water valve 2 and the inlet valve 4, and the water quantity and pressure of the membrane filaments to be measured and the cross-flow water quantity can be accurately adjusted by controlling the opening degree of the internal pressure cross-flow valve 9. When the pressure liquid 1 is supplied by adopting a pressure water tank mode, the effluent of the internal pressure cross flow water outlet pipe 70 can be directly discharged; when the pressure liquid 1 is supplied by a water pump pressurization mode, the effluent from the internal pressure cross flow water outlet pipe 70 flows back to the water tank 7. The internal pressure water collecting valve 10 is used for controlling the on and off of the drainage of the water tank 7. When the membrane flux is tested in the internal pressure mode, the valve is opened, and the filtered clean water flowing out of the internal pressure water collecting water outlet pipe 80 is collected by using a measuring cylinder or a beaker; the valve was closed while the membrane flux was tested in the external pressure mode. The pressure gas 11 is used to provide the pressure gas required for testing the bubble point of the internal pressure mode. The pressure gas can be supplied by a pressure pipe; an air pump supply may also be used. The pressure reducing valve 12 is used to reduce the pressure of the pressurized gas 11 to a pressure value required for detection. The main air valve 13 is used to control the opening and closing of the delivery pressure air 11. The air quantity and pressure of the test air circuit can be adjusted by controlling the opening of the master air valve. The barometer 14 monitors the pressure in the tube.

As shown in fig. 4, a second embodiment of the present invention is different from the first embodiment only in that four test units 100 are connected in parallel. And the fluid inlet system 200 may be connected directly to the left ends of all test cells. The internal pressure cross-flow water outlet pipes 70 in the output pipeline 300 can be gathered according to requirements, so as to uniformly treat the cross-flow water. The equipment can be used for independently controlling and testing one membrane yarn to be tested and can also be used for simultaneously testing four membrane yarns to be tested, so that the testing efficiency of the performance of the membrane yarns is greatly improved. Multiple test units, e.g., three, five, etc., may also be connected in parallel as desired.

As shown in fig. 5, a third embodiment of the present invention is based on the structure of the first embodiment, and some facilities for detecting the membrane flux of the external pressure mode of the membrane filament are mainly added to the first embodiment. Therefore, the sealing cover 16 is required to be provided on the sump 7 of the first embodiment, and the sealing performance of the sump is required to be maintained during operation. A bypass for external pressure test is also provided on the first pipe 50 between the water pressure gauge 5 and the inlet valve 4, and the bypass is provided with an inlet valve 15 and is directly communicated with the inner cavity of the water tank 7. The output pipeline also comprises an external pressure cross flow water outlet pipe which is directly communicated with the inner cavity of the water pool 7, and an external pressure cross flow valve 17 is arranged on the external pressure cross flow water outlet pipe. An external pressure water collecting outlet pipe with an external pressure water collecting valve 18 is also bypassed on the internal pressure cross flow outlet pipe 70 between the internal pressure cross flow valve 9 and the sealing mechanism 6. As shown in detail in fig. 5, the water inlet valve 15 is used to control the opening and closing of the pressure liquid 1 into the water reservoir 7, and the amount and pressure of the water entering the water reservoir 7 can be adjusted by controlling the opening of the valve. The sealing cover 16 is used for sealing the water tank 7, so that pressure water flow can be formed on the outer surface of the membrane wire 05 to be tested. The external pressure cross flow valve 17 is used for controlling the opening and closing of the pressure liquid in the water tank 7 when the pressure liquid leaves the water tank, so as to control the filtration mode of the membrane wire to be detected. The valve is in a dead-end filtration mode when closed; the valve is in cross-flow filtration mode when open. Meanwhile, the water quantity and pressure passing through the outer surface of the membrane wire 05 to be detected and the cross-flow water quantity can be accurately adjusted by controlling the opening of the external pressure cross-flow valve 17 in cooperation with the main water valve 2 and the water inlet valve 15. When the pressure liquid 1 is supplied by adopting a pressure water tank mode, the water outlet of the external pressure cross flow water outlet pipe can be directly drained; when the pressure liquid 1 is supplied by adopting a water pump pressurization mode, the effluent of the external pressure cross flow water outlet pipe flows back to the water tank 7. The external pressure water collecting valve 18 is used for controlling the on and off of water filtered out from the inner surface of the membrane wire 05 to be measured. In the external pressure mode membrane flux test, the valve is opened, and the filtering liquid flowing out of the external pressure water collecting water outlet pipe is collected by using a measuring cylinder or a beaker. The valve was closed during the internal pressure mode membrane flux test and the membrane bubble point test. The equipment can carry out internal pressure mode membrane flux test and membrane bubble point test on the membrane wire, and also can carry out external pressure mode membrane flux test, namely the equipment can select to detect the performance of the membrane wire according to the requirement.

Referring to fig. 6, a fourth embodiment of the present invention is shown, which is different from the third embodiment in that three test units 400 are connected in parallel. And the fluid inlet system 500 may be connected directly to the left ends of all test cells. According to the requirement, all the internal pressure cross flow water outlet pipes 70 in the output pipeline 600 can be gathered, and all the external pressure cross flow water outlet pipes can be gathered, so that the cross flow water can be uniformly treated. The device can independently control and test one membrane yarn to be tested and can also test three membrane yarns to be tested simultaneously, thereby greatly improving the testing efficiency of the performance of the membrane yarn. Multiple test units, e.g., four, five, etc., may also be connected in parallel as desired.

The invention also provides a test method for the equipment for quickly and accurately detecting the performance of the hollow fiber membrane, which comprises the following basic test steps: respectively installing and fixing two ends of a membrane wire to be tested on a sealing device in the test unit; and respectively selecting membrane flux for testing the bubble point and the internal pressure mode of the membrane or selecting membrane flux for testing the external pressure mode of the membrane according to the detection items of the membrane filament performance. The following describes the testing method of the present invention in detail by taking the testing apparatus provided in the third embodiment as an example, as shown in fig. 5.

1. The membrane flux test of the internal pressure mode is carried out on the membrane wire to be tested, and the steps are as follows:

and respectively installing and fixing two ends of the membrane wire 05 to be detected on the sealing devices 6 in the water tank 7. Selecting a corresponding test pressure liquid 1 and a test water channel, namely a first pipeline 50, and controlling related valves on the first pipeline, namely closing a main air valve 13, a water inlet valve 15, an external pressure cross flow valve 17 and an external pressure water collecting valve 18; and opening the main water valve 2, the inlet valve 4, the internal pressure cross-flow valve 9 and the internal pressure water collecting valve 10, inputting pressure liquid 1 into the inner cavity of the membrane wire 05 to be tested, adjusting the opening degrees of the main water valve 2, the inlet valve 4 and the internal pressure cross-flow valve 9, and matching the flowmeter 3 and the water pressure gauge 5 to ensure that the flow and the pressure of the pressure liquid 1 reach the set values of the test, and starting timing and pre-pressing time.

And (3) allowing the equipment to stably operate for a period of time, starting timing the filtering time when the equipment operates to reach the set pre-pressing time, and simultaneously placing a measuring cylinder or a beaker below the internal-pressure water collecting and discharging pipe 80 on the lower side of the water tank 7 to collect the output filtered liquid. When the equipment is stably operated for a period of time to reach the set filtration time, the measuring cylinder or the beaker is removed to finish the collection, and the input of the pressure liquid 1 is stopped. And finally, calculating the volume of the filtered liquid collected in the measuring cylinder or the beaker, and dividing the volume by the filtering time and the inner surface area of the membrane wire 05 to be detected, so as to obtain the membrane flux of the internal pressure mode of the membrane wire to be detected.

2. The membrane bubble point test of the membrane silk to be tested comprises the following steps:

and respectively installing and fixing two ends of the membrane wire 05 to be detected on the sealing devices 6 in the water tank 7. Selecting corresponding pressure gas 11 for testing and a testing gas circuit, namely a second pipeline 60, controlling and adjusting relevant valves on the testing gas circuit, namely closing a main water valve 2, an inlet valve 4, a water inlet valve 15, an internal pressure cross flow valve 9, an internal pressure water collecting valve 10, an external pressure cross flow valve 17 and an external pressure water collecting valve 18, opening a main gas valve 13, and inputting the pressure gas 11 to the second pipeline 60; adjusting the pressure reducing valve 12 by comparing with the value of the barometer 14 to reduce the pressure of the gas path, namely the pressure value of the barometer 14, to the set value of the test; and (3) filling clear water into the water tank 7 until the membrane wire 05 to be detected is submerged, slowly opening the inlet valve 4, inputting pressure gas 11 into the inner cavity of the membrane wire 05 to be detected, and observing the surface and the pressure value of the membrane wire to be detected.

When bubbles appear on the surface of the membrane wire 05 to be detected, recording the pressure value of the barometer 14 at the moment as the maximum bubble point; when a large amount of bubbles suddenly appear on the surface of the membrane wire to be detected, the pressure value of the barometer 14 at the moment is recorded as an average bubble point. Namely, the bubble point is the pressure value of the pressure gas 11 when the pressure gas 11 passes through the membrane filament wall body to be measured and a certain state appears. And closing the master gas valve 13, and opening the internal pressure cross flow valve 9 to discharge gas in the gas path. And finishing the detection.

3. The membrane flux test of the external pressure mode is carried out on the membrane wire to be tested, and the steps are as follows:

and respectively installing and fixing two ends of the membrane wire 05 to be detected on the sealing devices 6 in the water tank 7, and sealing the water tank 7 by using the sealing covers 16 to ensure that the water tank 7 is well sealed. Selecting a corresponding pressure liquid 1 for testing and a testing waterway, controlling related valves on the testing waterway, namely closing a main air valve 13, an inlet valve 4, an inner pressure cross flow valve 9 and an inner pressure water collecting valve 10, opening a main water valve 2, an inlet valve 15, an outer pressure cross flow valve 17 and an outer pressure water collecting valve 18, and directly inputting the pressure liquid 1 into the inner cavity of the water tank 7; and adjusting the opening degrees of the total water valve 2, the water inlet valve 15 and the external pressure cross flow valve 17, and matching the flowmeter 3 and the water pressure gauge 5 to enable the flow rate and the pressure of the pressure liquid 1 to reach the set values of the test.

And after the outer pressure water collecting water outlet pipe communicated with the inner hole of the membrane wire 05 to be detected in the output pipeline begins to discharge water, circulating the pressure liquid 1 for running to reach the set pre-pressing time, beginning timing the filtering time, and simultaneously placing a measuring cylinder or a beaker below the outer pressure water collecting water outlet pipe to collect the output filtering liquid. The apparatus is allowed to run for a period of time, and when the set filtration time is reached, the measuring cylinder or beaker is removed to end the collection and the input of the pressure liquid 1 is stopped. And finally, calculating the volume of the filtered liquid collected in the measuring cylinder or the beaker, and dividing the volume by the filtering time and the area of the outer surface of the membrane wire to be tested, so that the membrane flux of the external pressure testing mode is obtained.

The invention breaks through the limitation that the film yarn detection equipment in the past must use strings to bind or glue when connecting the film yarn sample to be detected, and greatly improves the timeliness of the film yarn detection while ensuring the detection accuracy. A specially designed sealing device is adopted, so that the process of preparing a sample for membrane yarn detection is omitted, the detection cost is saved, and the detection accuracy is ensured; the invention can be simply and rapidly installed and sealed, greatly improves the film performance detection speed and efficiency, and is beneficial to the management and control of the film product quality of a production line.

The above description is only exemplary of the present invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a quick accurate check out test set of hollow fiber membrane performance which characterized in that, including at least one inside be equipped with the sealed wind device's of fixed membrane silk that awaits measuring test unit, with test unit one end lug connection's pressure fluid input system, locate the test unit other end the output pipeline of pressure fluid.

2. The rapid and accurate detection device according to claim 1, wherein the sealing device comprises a tubular housing, a tubular sealing mechanism arranged in the housing, and a connecting mechanism for fixing the sealing mechanism in the housing; the top of the shell and the top of the corresponding sealing mechanism are provided with through holes for inserting one end of the membrane wire to be tested into the sealing mechanism, and the lower port of the sealing mechanism is sealed by a sealing ring; the connecting mechanism comprises a base in threaded connection with an inner hole at the lower end of the shell and a needle tube arranged in the middle of the base, wherein one end of the needle tube is communicated with the outside, and the other end of the needle tube penetrates through the sealing ring to be inserted into the sealing mechanism and is communicated with the inner hole of the membrane wire to be detected; when the shell and the base are screwed tightly, the inner surface of the base abuts against the outer end surface of the sealing ring.

3. The rapid accurate detection apparatus according to claim 2, wherein the pressure fluid is a gas and a liquid; the test unit is a water tank, and two sealing devices for fixing the membrane wires to be tested are respectively arranged at two transverse ends in the water tank; the pressure fluid input system comprises a first pipeline for inputting pressure liquid into an inner hole at one end of the membrane wire to be detected, and a total water valve, a flowmeter, a water pressure meter and an inlet valve which are sequentially arranged on the first pipeline; the second pipeline is connected with the first pipeline in parallel and used for inputting pressure gas, and the pressure reducing valve, the air pressure gauge and the master air valve are sequentially arranged on the second pipeline.

4. The rapid and accurate detection device according to claim 3, wherein the output pipeline comprises an internal pressure cross flow water outlet pipe communicated with the inner hole at the other end of the membrane wire to be detected, and the cross flow water outlet pipe is provided with an internal pressure outlet valve; and the internal pressure water collecting outlet pipe is arranged on the lower side of the test unit and is provided with an internal pressure water collecting valve.

5. The rapid and accurate inspection apparatus according to claim 4, wherein the basin is provided with a sealing cover; and a bypass for external pressure test is arranged on the first pipeline between the water pressure meter and the inlet valve, a water inlet valve is arranged on the bypass, and the bypass is communicated with the water pool.

6. The rapid and accurate detection apparatus according to claim 5, wherein the output pipeline further comprises an external pressure cross flow water outlet pipe communicated with the water pool, and an external pressure outlet valve is arranged on the external pressure cross flow water outlet pipe; and an external pressure water collecting outlet pipe with an external pressure water collecting valve is also bypassed on the internal pressure cross flow outlet pipe.

7. A test method using the rapid and accurate detection device according to claim 6, characterized in that two ends of the membrane wire to be tested are respectively installed and fixed on the sealing device in the test unit; and respectively selecting membrane flux or membrane bubble points of a membrane filament internal pressure test mode or selecting membrane flux of a membrane filament external pressure test mode according to the detection items of the membrane filament performance.

8. The test method of claim 7, comprising, for the membrane flux in the test internal pressure mode, the steps of:

selecting corresponding pressure liquid and a test waterway for testing, controlling a relevant valve on the test waterway, inputting the pressure liquid into the inner cavity of the membrane wire to be tested, enabling the flow and the pressure of the pressure liquid to reach the set values of the test, and starting to time the prepressing time;

and when the running of the equipment reaches the set pre-pressing time, starting to collect the filtered liquid output by the test unit, and when the set filtering time is reached, finishing the collection, and finally calculating the membrane flux of the internal pressure mode of the membrane filaments to be tested.

9. The method of testing as claimed in claim 7, wherein for the bubble point of the test internal pressure pattern, the steps of:

selecting corresponding pressure gas for testing and a testing gas circuit, controlling and adjusting a relevant valve on the testing gas circuit, and enabling the pressure of the pressure gas to reach a set value for testing; filling clear water into the test unit until the membrane filaments to be tested are submerged, and inputting the pressure gas into the inner cavity of the membrane filaments to be tested;

when bubbles appear on the surface of the membrane wire to be detected, recording the pressure value of the pressure gas at the moment as a maximum bubble point; and recording the pressure value of the pressure gas at the moment when a large number of bubbles appear on the surface of the membrane wire to be detected suddenly, wherein the pressure value is the average bubble point.

10. The method of testing as claimed in claim 7, wherein for said testing of membrane flux in external pressure mode, comprising the steps of:

sealing the test unit by using a sealing cover to ensure that the test unit is well sealed;

selecting corresponding pressure liquid and a test waterway for test, controlling a relevant valve on the test waterway, and directly inputting the pressure liquid into the inner cavity of the test unit; and the flow and the pressure of the pressure liquid reach the testing set values;

and after the external pressure water collecting outlet pipe communicated with the inner hole of the membrane filament to be detected in the output pipeline begins to discharge water, allowing the pressure liquid to run for a set pre-pressing time, then beginning to collect the filtered liquid output by the external pressure water collecting outlet pipe, and after the set filtering time is reached, ending the collection, and finally calculating the membrane flux of the membrane filament to be detected in the external pressure mode.

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