CN117740645A - Test method, system and bacteria-isolation filter element - Google Patents
Test method, system and bacteria-isolation filter element Download PDFInfo
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- CN117740645A CN117740645A CN202311714131.1A CN202311714131A CN117740645A CN 117740645 A CN117740645 A CN 117740645A CN 202311714131 A CN202311714131 A CN 202311714131A CN 117740645 A CN117740645 A CN 117740645A
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- 230000001580 bacterial effect Effects 0.000 claims abstract description 84
- 238000012360 testing method Methods 0.000 claims abstract description 52
- 239000007788 liquid Substances 0.000 claims abstract description 44
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- 239000000463 material Substances 0.000 claims description 53
- 238000007789 sealing Methods 0.000 claims description 24
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 11
- 239000004743 Polypropylene Substances 0.000 claims description 10
- 230000000844 anti-bacterial effect Effects 0.000 claims description 10
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- 229920000049 Carbon (fiber) Polymers 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000002131 composite material Substances 0.000 claims description 6
- 239000005708 Sodium hypochlorite Substances 0.000 claims description 4
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims description 4
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- 230000001678 irradiating effect Effects 0.000 claims description 2
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- 229910052799 carbon Inorganic materials 0.000 abstract description 6
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Abstract
The invention discloses a testing method, a system and a bacteria isolation filter core, which are characterized in that a bacteria solution, a bacteria collecting liquid and a sterilizing liquid are respectively added into a bacteria carrying device, a bacteria collecting device and a bacteria removing device, because the air pump, the bacteria carrying device, the bacteria isolation filter core to be tested, the bacteria collecting device and the bacteria removing device are sequentially connected, air output by the air pump during working can carry bacteria in the bacteria solution to the bacteria collecting device after the bacteria in the bacteria solution are led to the bacteria isolation filter core to be tested for purifying and isolating, the purified gas can enter the bacteria collecting device to collect the bacteria in the purified gas, finally the purified gas enters the bacteria removing device and is discharged after sterilization and disinfection, the outside air is prevented from being polluted, and because the air pump is operated until the purified gas output by the bacteria isolation filter core to be tested reaches the nominal rated total purified gas amount, then the concentration C of the bacteria collecting liquid is passed 1 And concentration C of bacterial solution in the bacteria-carrying device 0 Difference between C and C 0 The bacterial isolation property of the bacterial isolation filter element to be measured is measured according to the ratio ofCan be convenient and quick, and has no pollution.
Description
Technical Field
The invention relates to the technical field of drinking water purification, in particular to a testing method, a testing system and a bacteria-isolating filter element.
Background
For sealed drinking water tank facilities, a vent hole is usually arranged at the top of the water tank in order to balance the internal and external air pressure of the water tank. Since the vent is in communication with the outside air, a bacteria-resistant filter element is typically required to prevent bacteria from entering the tank.
However, at present, no technical means for conveniently and rapidly detecting the bacteria isolation performance of the bacteria isolation filter element exists.
Disclosure of Invention
The invention aims to provide a testing method, a testing system and a bacteria isolation filter element, which can conveniently and rapidly test the bacteria isolation performance of the bacteria isolation filter element without pollution.
In a first aspect, the invention provides a testing method, which is applied to a testing system, wherein the testing system comprises an air pump, a bacteria-carrying device, a bacteria collecting device and a bacteria removing device, and the air pump, the bacteria-carrying device, a bacteria-isolating filter element to be tested, the bacteria collecting device and the bacteria removing device are sequentially connected;
the method comprises the following steps:
respectively adding a bacterial solution, a bacterial collection liquid and a sterilizing liquid into the bacteria carrying device, the bacterial collection device and the bacterial removal device, wherein the bacterial concentration of the bacterial solution is C 0 ；
Starting an air pump to introduce air into the bacteria-carrying device until the purified gas amount output by the bacteria-isolating filter element to be tested reaches the nominal rated total purified gas amount;
detecting the bacterial concentration C of a bacterial collection liquid in the bacterial collection device 1 ；
By η= (C 0 -C 1 )/C 0 * And obtaining the bacterial interception efficiency eta of the bacterial isolation filter element to be detected by 100 percent.
In an alternative embodiment, in the step of detecting the bacterial concentration C1 of the bacterial collection fluid within the bacterial collection device:
shaking up the bacterial collection liquid;
taking 1ml of the bacterial collection liquid out and placing the bacterial collection liquid into a bacterial culture medium;
culturing at 35-37 deg.c for 48 hr and recording colony number.
In an alternative embodiment, before the steps of adding the bacterial solution, the bacterial collection fluid and the sterilizing fluid to the bacteria-carrying device and the bacterial collection device, respectively, the method further comprises:
and (3) sterilizing the test system by using a sodium hypochlorite solution with the concentration of 5% for 30min, and then washing the test system by using pure water.
In an alternative embodiment, the test system further comprises a flow meter connected between the air pump and the bacteria-carrying device;
starting an air pump to introduce air into the bacteria-carrying device until the purified gas output by the bacteria-isolating filter element to be tested reaches the nominal rated total purified gas amount, and stopping the process:
and stopping when the gas quantity L=vt output by the air pump in the operation test time t reaches the nominal rated total purified gas quantity of the to-be-tested bacteria-isolation filter element according to the air flow speed v measured by the flow meter.
In a second aspect, the present invention provides a test system, capable of implementing the test method according to any one of the foregoing embodiments, where the test system includes an air pump, a bacteria-carrying device, a bacteria-collecting device, and a bacteria-removing device that are sequentially connected, where the bacteria-carrying device and the bacteria-collecting device are used for connecting a bacteria-isolating filter element to be tested.
In an alternative embodiment, the bacteria-carrying device, the bacteria-collecting device and the bacteria-removing device all comprise a container, and an air inlet pipe and an air outlet pipe which extend into the container, wherein the height of the air outlet end of the air inlet pipe is lower than that of the air inlet end of the air outlet pipe, and when a solution exists in the container, the air outlet end of the air inlet pipe is positioned below the liquid level of the solution;
and/or the number of the groups of groups,
the test system further comprises a one-way valve connected between the bacteria-collecting device and the bacteria-removing device;
and/or the number of the groups of groups,
the test system further comprises a flowmeter connected between the air pump and the bacteria-carrying device;
and/or the number of the groups of groups,
the test system further comprises a first air pressure valve connected between the air inlet of the to-be-tested bacteria-isolation filter element and the bacteria-carrying device, and a second air pressure valve connected between the air outlet of the to-be-tested bacteria-isolation filter element and the bacteria collecting device.
In a third aspect, the present invention provides a bacterial isolation filter cartridge, capable of being tested by the test method according to any one of the preceding embodiments, the bacterial isolation filter cartridge comprising a housing and a filter material assembly;
the shell comprises a shell body and a cover body, wherein the first end of the shell body is open, the second end of the shell body is closed, and a first air port is formed in the second end of the shell body;
the cover body is detachably connected to the opening end of the shell and is provided with a second air port;
the shell and the cover body jointly enclose a cavity, and the first air port and the second air port are communicated with the cavity;
the filter material component is positioned in the cavity, and one of the cover body and the second end is detachably connected with the filter material component and is in sealing fit with the filter material component.
In an alternative embodiment, the filter assembly comprises a filter body, and a first filter cover and a second filter cover fixed at two ends of the filter body;
one of the cover body and the second end is detachably connected with the first filter material cover and is in sealing fit with the first filter material cover, and a gap is reserved between the other cover body and the second filter material cover.
In an alternative embodiment, one of the cover body and the second end is sealed with the first filter material cover through a first sealing ring;
and/or the number of the groups of groups,
one of the cover body and the second end is in threaded fit with the first filter material cover to realize detachable connection;
and/or the number of the groups of groups,
the first filter material cover and/or the second filter material cover are/is bonded with the filter material body;
and/or the number of the groups of groups,
the filter material body is made of a composite material, and the composite material comprises a coarse-effect interception net, an antibacterial material layer, a framework supporting layer, a melt-blown polypropylene filter layer, activated carbon fibers and an inner layer supporting net which are sequentially laminated and distributed.
In an alternative embodiment, one of the cover and the housing is provided with a first internal thread, and the other is provided with a first external thread which is matched with the first internal thread;
and/or the number of the groups of groups,
the filter material component is provided with an extension pipe part extending into the first air port or the second air port, the outer peripheral wall of the extension pipe part is sealed with the inner peripheral wall of the first air port through a second sealing ring, or the outer peripheral wall of the extension pipe part is sealed with the inner peripheral wall of the second air port through a second sealing ring;
and/or the number of the groups of groups,
the other of the cover body and the second end with the filter material component is provided with a plurality of ultraviolet lamps distributed in an annular array on the peripheral wall of the shell, and the ultraviolet lamps are used for irradiating ultraviolet light towards the inside of the shell.
The beneficial effects of the embodiment of the invention include:
the bacteria solution, the bacteria collecting liquid and the sterilizing liquid are respectively added into the bacteria carrying device, the bacteria collecting device and the bacteria removing device, as the air pump, the bacteria carrying device, the to-be-tested bacteria isolating filter element, the bacteria collecting device and the bacteria removing device are sequentially connected, air output by the air pump during operation can carry bacteria in the bacteria solution to the to-be-tested bacteria isolating filter element, purified gas output by the to-be-tested bacteria isolating filter element after purifying and isolating can enter the bacteria collecting device so as to collect bacteria in the purified gas, finally, the purified gas enters the bacteria removing device and is discharged after sterilizing and disinfecting, so that the outside air is prevented from being polluted, and the operation of the air pump is stopped until the purified gas output by the to-be-tested bacteria isolating filter element reaches the nominal total purified gas amount, so that the to-be-tested bacteria isolating filter element just reaches the saturation value of the self bacteria isolating effect, and then the purified gas passes through the fine filter elementConcentration C of the bacterial pool 1 And concentration C of bacterial solution in the bacteria-carrying device 0 Difference between C and C 0 The bacteria isolation performance eta of the bacteria isolation filter element to be measured can be measured by the ratio of the bacteria isolation filter element to be measured, and the method is convenient and quick and has no pollution.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a test system according to an embodiment of the present invention;
FIG. 2 is a flow chart of a testing method according to an embodiment of the invention;
FIG. 3 is a flow chart illustrating the substep of step S7 in FIG. 2;
FIG. 4 is a schematic perspective view of a bacterial isolation filter element according to an embodiment of the present invention;
FIG. 5 is an exploded view of the internal construction of the bacterial isolation cartridge of the present embodiment;
FIG. 6 is a cross-sectional view of a bacterial isolation cartridge of an embodiment of the present invention;
FIG. 7 is an enlarged view of the portion I of FIG. 6;
fig. 8 is an enlarged view of the portion ii of fig. 6.
Icon: 100-a test system; 110-an air pump; 120-flowmeter; 130-a bacteria-carrying device; 131-a first container; 132-a first air inlet pipe; 133-a first outlet duct; 140-a first air pressure valve; 150-a second pneumatic valve; 160-a bacterial harvesting device; 161-a second container; 162-a second air inlet pipe; 163-a second outlet duct; 170-a one-way valve; 180-bacteria removal device; 181-a third container; 182-a third air inlet pipe; 183-a third outlet duct; 300-bacteria-isolating filter element; 301-a coarse efficiency interception net; 302-a layer of antimicrobial material; 303-a framework support layer; 304-a melt blown polypropylene filtration layer; 305-activated carbon fiber; 306-an inner layer support mesh; 310-a housing; 311-first end; 312-second end; 313—a first port; 314—first external threads; 320-cover; 321-a second port; 322-a cover body; 323-ring body; 324—first internal thread; 325-connecting ring; 326-second internal thread; 330-a first filter cap; 331-second external threads; 332-extending the tube portion; 333-mounting slots; 340-filtering material; 350-a second filter cover; 360-ultraviolet lamp; 370-a first seal ring; 380-a second sealing ring.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal," "vertical," "overhang," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Some embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.
Referring to fig. 1, the embodiment of the invention further discloses a testing system 100, where the testing system 100 includes an air pump 110, a bacteria-carrying device 130, a bacteria-collecting device 160 and a bacteria-removing device 180, which are sequentially connected, and the bacteria-carrying device 130 and the bacteria-collecting device 160 are connected by a bacteria-isolating filter 300 to be tested. That is, the air pump 110, the bacteria-carrying device 130, the bacteria-isolating filter 300 to be tested, the bacteria-collecting device 160 and the bacteria-removing device 180 are sequentially connected, and the specific connection mode is pipeline connection.
In more detail, the bacteria-carrying device 130, the bacteria-collecting device 160 and the bacteria-removing device 180 each include a container, and an air inlet pipe and an air outlet pipe extending into the container, wherein the height of the air outlet end of the air inlet pipe is lower than the height of the air inlet end of the air outlet pipe, and when the solution exists in the container, the air outlet end of the air inlet pipe is positioned below the liquid level of the solution.
Specifically, the bacteria collecting device 160 includes a first container 131, a first air inlet pipe 132 and a first air outlet pipe 133, where the first air inlet pipe 132 and the first air outlet pipe 133 extend into the first container 131, the first container 131 is used for placing the bacteria solution therein, the air outlet end of the first air inlet pipe 132 and the air inlet end of the first air outlet pipe 133 are located in the first container 131, the air inlet end of the first air inlet pipe 132 is immersed under the liquid surface of the bacteria solution, and the air inlet end of the first air outlet pipe 133 is located above the liquid surface of the bacteria solution, so the air outlet end of the first air inlet pipe 132 is lower than the air inlet end of the first air outlet pipe 133.
The bacteria collecting device 160 includes a second container 161, a second air inlet pipe 162 and a second air outlet pipe 163, wherein the second air inlet pipe 162 and the second air outlet pipe 163 extend into the second container 161, the second container 161 is used for placing bacteria collecting liquid therein, the air outlet end of the second air inlet pipe 162 and the air inlet end of the second air outlet pipe 163 are both positioned in the second container 161, and the air inlet end of the second air inlet pipe 162 is immersed below the liquid level of the bacteria solution, and the air inlet end of the second air outlet pipe 163 is positioned above the liquid level of the bacteria solution, so that the height of the air outlet end of the second air inlet pipe 162 is lower than the height of the air inlet end of the second air outlet pipe 163.
The bacteria removing device 180 includes a third container 181, a third air inlet pipe 182 and a third air outlet pipe 183, the third air inlet pipe 182 and the third air outlet pipe 183 extend into the third container 181, the third container 181 is used for placing the sterilizing liquid therein, the air outlet end of the third air inlet pipe 182 and the air inlet end of the third air outlet pipe 183 are both positioned in the third container 181, the air inlet end of the third air inlet pipe 182 is immersed under the liquid surface of the sterilizing liquid, and the air inlet end of the third air outlet pipe 183 is positioned above the liquid surface of the sterilizing liquid, so the air outlet end of the third air inlet pipe 182 is lower than the air inlet end of the third air outlet pipe 183.
The air pump 110 is connected to the air inlet end of the first air inlet pipe 132, the air outlet end of the first air outlet pipe 133 is connected to the air inlet of the filter 300, the air inlet end of the second air inlet pipe 162 is connected to the air outlet of the filter 300, the air outlet end of the second air outlet pipe 163 is connected to the air inlet end of the third air inlet pipe 182, and the air outlet of the third air outlet pipe 183 is communicated with the outside air.
Thus, when the air pump 110 operates, the air pump 110 can introduce air into the first container 131 through the first air inlet pipe 132, then carry bacteria in the bacteria solution in the first container 131 to the bacteria isolation filter element 300 to be tested from the first air outlet pipe 133, the gas purified by the bacteria isolation filter element 300 to be tested is introduced into the bacteria collection liquid in the second container 161 through the second air inlet pipe 162, after the bacteria in the purified gas is collected by the bacteria collection liquid, the gas is led to the third air inlet pipe 182 from the second air outlet pipe 163, then the gas is clean and pollution-free after the bacteria solution in the third container 181 is sterilized, and finally the gas is discharged to the external atmosphere through the third air outlet pipe 183.
The test system 100 further includes a flow meter 120 connected between the air pump 110 and the bacteria-carrying device 130, the flow meter 120 may be specifically a rotameter 120, and is connected between the air pump 110 and the air inlet end of the first air inlet pipe 132, where the flow meter 120 is used to detect the air flow velocity v output by the air pump 110 in real time, so that the air quantity L output by the air pump 110 can be obtained according to the product of v and the time t of operation of the air pump 110, and after the tightness of the whole system is ensured, the whole system has only one path of air path running pipeline without other branches and leakage, so that the purified air quantity output by the bacteria-separating filter 300 to be tested is equal to the air quantity L output by the air pump 110. The maintenance time t of the bacteria isolation performance of the bacteria isolation filter 300 to be tested is conveniently tested, and the air pump 110 is only required to operate for the same time t, so that the gas output by the air pump 110 reaches the nominal rated total purified gas quantity of the bacteria isolation filter 300 to be tested.
The test system 100 further includes a first air pressure valve 140 connected between the air inlet of the to-be-tested bacterial isolation filter 300 and the bacteria-carrying device 130, and a second air pressure valve 150 connected between the air outlet of the to-be-tested bacterial isolation filter 300 and the bacteria-collecting device 160, that is, the first air pressure valve 140 is connected between the air outlet end of the first air outlet pipe 133 and the air inlet of the to-be-tested bacterial isolation filter 300, so as to be capable of monitoring the first air pressure of the air inlet of the to-be-tested bacterial isolation filter 300 in real time, and the second air pressure valve 150 is connected between the air outlet end of the to-be-tested bacterial isolation filter 300 and the air inlet end of the second air inlet pipe 162, so that the air pressure difference (that is, the difference between the first air pressure and the second air pressure) of the to-be-tested bacterial isolation filter 300 can be obtained according to the readings of the first air pressure valve 140 and the second air pressure valve 150, so as to ensure that the air pressure difference does not exceed the nominal pressure difference of the bacterial isolation filter 300.
The air pump 110 is a variable frequency pump, so that the output flow rate of the self-output gas can be correspondingly adjusted according to the nominal flow rate of the bacteria-isolating filter 300 to be tested.
The test system 100 further comprises a one-way valve 170 connected between the bacteria-collecting device 160 and the bacteria-removing device 180, i.e. the one-way valve 170 is connected between the outlet end of the second outlet tube 163 and the inlet end of the third inlet tube 182, which one-way valve 170 enables fluid to pass only from the bacteria-collecting device 160 to the bacteria-removing device 180, while preventing fluid from passing from the bacteria-removing device 180 to the bacteria-collecting device 160, thereby avoiding that a sterilizing liquid enters the second container 161 to kill part of the bacteria, so as to avoid affecting the accuracy of the test.
Referring to fig. 2, an embodiment of the present invention discloses a testing method, which is implemented based on the testing system 100 of the above embodiment, and includes the following steps:
step S3, adding the bacterial solution, the bacterial collection liquid and the sterilization liquid into the bacteria carrying device 130, the bacterial collection device 160 and the bacterial removal device 180 respectively, wherein the bacterial concentration of the bacterial solution is C 0 ；
Step S5, starting the air pump 110 to introduce air into the bacteria-carrying device 130 until the purified gas output by the bacteria-separating filter 300 to be tested reaches the nominal rated total purified gas;
step S7, detecting the concentration of bacteria C in the bacteria collection liquid in the bacteria collection device 160 1 ；
Step S9, by η= (C 0 -C 1 )/C 0 * The bacterial interception efficiency eta of the bacteria-isolating filter 300 to be detected is obtained by 100 percent.
In this way, by adding the bacterial solution, the bacterial collection liquid and the sterilizing liquid to the bacteria-carrying device 130, the bacterial collection device 160 and the bacterial removal device 180, respectively, the air output during the operation of the air pump 110 can be obtained because the air pump 110, the bacteria-carrying device 130, the bacterial isolation filter 300 to be tested, the bacterial collection device 160 and the bacterial removal device 180 are connected in sequenceBacteria in the carried bacteria solution are led to the to-be-detected bacteria-isolating filter element 300, purified gas output after the to-be-detected bacteria-isolating filter element 300 purifies bacteria can enter the bacteria collecting device 160 so as to collect bacteria in the purified gas, finally, the bacteria enter the bacteria removing device 180 and are discharged after sterilization and disinfection, so that the air is prevented from polluting the outside air, and because the air pump 110 is operated until the purified gas output by the to-be-detected bacteria-isolating filter element 300 reaches the nominal rated total purified gas, the to-be-detected bacteria-isolating filter element 300 just reaches the saturation value of the self bacteria-isolating effect, and then the concentration C of the bacteria collecting liquid is used for collecting the bacteria 1 And concentration C of bacterial solution in bacteria-carrying device 130 0 Difference between C and C 0 The bacteria isolation performance eta of the bacteria isolation filter 300 to be measured can be measured by the ratio of the bacteria isolation filter, and the method is convenient and quick and has no pollution.
Prior to step S3, the method further comprises:
the test system 100 is sterilized and then rinsed with pure water.
This ensures that the concentration of bacteria in subsequent steps is not affected by bacteria carried by the structure of the test system 100, thereby ensuring the accuracy of the test results.
Wherein, the sodium hypochlorite solution with the concentration of 5% can be used for 30min disinfection, and then the water is used for washing clean, so that the disinfection and sterilization effects are ensured.
It should be noted that, before the air pump 110, the bacteria-carrying device 130, the to-be-tested bacteria-isolating filter 300, the bacteria-collecting device 160 and the bacteria-removing device 180 are connected by pipelines, the air pump 110, the bacteria-carrying device 130, the bacteria-collecting device 160, the bacteria-removing device 180 and various pipelines are sterilized and then are rinsed with pure water, and then the test system 100 and the to-be-tested bacteria-isolating filter 300 are assembled, so that the sterilizing effect can be further ensured, and the accuracy of the test result is ensured.
In step S3, C 0 The range of (1) is 500-1500 cfu/mL, the bacteria collecting liquid is normal saline (and is subjected to high-temperature steam sterilization treatment for 30 min), and the sterilizing liquid is sodium hypochlorite solution with concentration of 5%.
In step S5, after the tightness of the whole system is ensured, the whole system has only one path of the gas path running pipeline without other branches and leakage, so that the amount of purified gas output by the to-be-detected bacteria-isolation filter 300 is equal to the amount L of gas output by the gas pump 110.
Therefore, in order to test the maintenance time t of the bacteria-isolating performance of the bacteria-isolating filter 300 to be tested, the air pump 110 is only required to operate for the same time t, so that the gas output by the air pump 110 reaches the nominal rated total purified gas quantity of the bacteria-isolating filter 300 to be tested.
The test system 100 further includes a flow meter 120 connected between the air pump 110 and the bacteria-carrying device 130, that is, the air pump 110, the flow meter 120, the bacteria-carrying device 130, the bacteria-isolating filter 300 to be tested, the bacteria-collecting device 160 and the bacteria-removing device 180 are sequentially connected, and the flow meter 120 may be specifically a rotameter 120, which may be used to detect the air flow velocity v output by the air pump 110;
in this way, according to the air flow velocity v measured by the flow meter 120, the air pump 110 stops when the air quantity l=vt outputted by the operation test time t reaches the nominal rated total purified air quantity of the to-be-measured bacterial load 300.
In connection with fig. 3, in step S7, the following operation steps may be specifically adopted:
step S70, shaking up a bacterial collection liquid;
step S72, taking out 1ml of the bacterial collection liquid and placing the bacterial collection liquid in a bacterial culture medium;
step S74, culturing for 48 hours at the temperature of 35-37 ℃, and recording colony count, wherein the unit is cfu/ml.
Because the internal filter material structure of the traditional bacteria-isolation filter element 300 is adhered inside the bacteria-isolation filter element through hot melt adhesive, when the bacteria-isolation filter element 300 reaches the service life, if the bacteria-isolation filter element 300 is disassembled, all the components of the bacteria-isolation filter element 300 can be separated only through a cutting mode, the disassembly cost is high, the components are easily cut and damaged, the labor cost for cutting and disassembling the bacteria-isolation filter element 300 is high, and the recycling rate is low; therefore, most of the bacteria-isolating filter 300 reaching the service life in the prior art is to treat the waste material of the whole structure of the bacteria-isolating filter 300, so that the waste is serious and the recycling rate is low.
For this reason, the inventor has studied and proposed an embodiment of a bacteria-isolating filter 300 to improve, namely the invention also discloses a bacteria-isolating filter 300, the bacteria-isolating filter 300 can be tested by the testing method of the above embodiment, and the bacteria-isolating filter 300 comprises a shell and a filter material component in combination with fig. 4 to 8;
the housing comprises a shell 310 and a cover 320, wherein a first end 311 of the shell 310 is open, a second end 312 is closed and provided with a first air port 313;
the cover 320 is detachably connected to the open end of the housing 310, and is provided with a second air port 321;
the housing 310 and the cover 320 together define a cavity, and the first air port 313 and the second air port 321 are both communicated with the cavity;
a filter media assembly is positioned within the cavity, and one of the cap 320 and the second end 312 is removably coupled to and sealingly engaged with the filter media assembly.
In this way, the shell of the bacteria-isolation filter 300 is made into the shell 310 and the cover 320 which are detachably connected, and meanwhile, the filter material component is detachably connected with one of the cover 320 and the second end 312, so that the bacteria-isolation filter 300 is integrally in a modularized detachable design, and in the practical application process, all parts of the bacteria-isolation filter 300 can be separated and cleaned without cutting, the disassembly cost is low, all the clean parts can be transported to a dust-free assembly workshop for recycling, and the recycling rate is high.
It should be noted that, one of the first air port 313 and the second air port 321 is an air inlet, and the other is an air outlet, for example, as shown in the drawing, the first air port 313 is an air inlet, the second air port 321 is an air outlet, at this time, the filter material component is detachably connected with the cover 320 and is in sealing fit, meanwhile, a space is reserved between the filter material component and the inner wall of the second end 312, so that after the air enters from the first air port 313, the air can uniformly enter into the filter material component through the space to filter dust, hair, silt and other impurities and kill mold and bacteria, thereby playing a role in purifying the air, and the purified air is led into the second air port 321 from the inside of the filter material component because the filter material component is in sealing fit with the cover 320, so as to be discharged from the second air port 321.
It will be appreciated that a gap is also left between the filter assembly and the inner peripheral wall of the housing 310, which is annular, so that the gas with cleaning enters from the peripheral side of the filter assembly and exits from the interior of the center to ensure filtration uniformity.
Of course, in some embodiments, the first air port 313 may be an air outlet, and the second air port 321 may be an air inlet, where the filter assembly is detachably connected to and sealed with the inner wall of the second end 312, and a space is left between the filter assembly and the cover 320.
In this embodiment, the housing 310 has a hollow cylindrical shape, and the cover 320 includes a disc-shaped cover main body 322 and a ring body 323 surrounding an edge of the cover main body 322, where the ring body 323 is detachably connected to a peripheral wall of the housing 310, so that the cover main body 322 covers the first end 311 of the housing 310.
Specifically, the ring 323 of the cover 320 and the housing 310 may be connected by a detachable connection manner such as a threaded connection, a snap connection, etc., and for example, one of the ring 323 of the cover 320 and the housing 310 is provided with a first internal thread 324, and the other is provided with a first external thread 314 matched with the first internal thread 324.
For example, the ring body 323 is provided with a first female screw 324, and the outer peripheral wall of the corresponding housing 310 is provided with a first male screw 314.
Of course, in some embodiments, the ring body 323 may be provided with the first external thread 314, and the corresponding inner peripheral wall of the housing 310 may be provided with the first internal thread 324.
In this embodiment, be provided with a plurality of ultraviolet lamps 360 that annular array distributes on the perisporium of casing 310, ultraviolet lamp 360 is used for shining the ultraviolet light towards casing 310 inside to can carry out preliminary bactericidal action to the air current that gets into the fungus isolation filter core 300, not be intercepted by the filter material subassembly by the bacterium that kills, and a plurality of ultraviolet lamps 360 are annular array and distribute and can increase the coverage that ultraviolet lamp 360 shined, improve preliminary bactericidal efficiency.
Wherein, in the length direction of the housing 310, the ultraviolet lamp 360 is located between the other of the cover 320 and the second end 312 and the filter material component, that is, the ultraviolet lamp 360 is located at a side close to the air inlet, so that the air flow entering the bacteria-isolation filter 300 can be completely irradiated by ultraviolet light for sterilization and then enter the filter material component for filtration, and the primary sterilization efficiency is improved.
Specifically, in the present embodiment, i.e., in the length direction of housing 310, ultraviolet lamp 360 is located between filter media assembly and second end 312. Of course, in some embodiments, if the first air port 313 is an air outlet, then the ultraviolet lamp 360 is located between the filter assembly and the cover 320.
The filter assembly includes a filter body 340, and a first filter cover 330 and a second filter cover 350 fixed at both ends of the filter body 340;
one of the cap 320 and the second end 312 is detachably connected to and sealingly engages the first filter cap 330, and the other is spaced from the second filter cap 350.
That is, in this embodiment, the first filter cover 330 is detachably connected to the cover 320 and is in sealing engagement, and the second filter cover 350 is spaced from the second end 312. Of course, in the embodiment where the first air port 313 is an air outlet, a space may be left between the first filter cover 330 and the cover 320, and the corresponding second filter cover 350 is detachably connected to and hermetically matched with the inner wall of the second end 312.
The first filter material cover 330 and the cover 320 may be detachably connected by threaded connection, snap connection, or the like, and taking threaded connection as an example, the cover main body 322 of the cover 320 is provided with a connection ring 325 extending toward the second end 312, the extension direction of the connection ring 325 is the same as the length direction of the housing 310, the connection ring 325 surrounds the outer side of the second air port 321, the inner peripheral wall of the connection ring 325 is provided with a second internal thread 326, and the first filter material cover 330 is provided with a second external thread 331, so that threaded connection between the first filter material cover 330 and the cover 320 can be achieved by threaded fit of the second internal thread 326 and the second external thread 331.
Of course, in the embodiment in which the first air port 313 is an air outlet, the second end 312 may be provided with the connection ring 325, so long as one of the cover 320 and the second end 312 has the connection ring 325 extending along the length direction of the housing 310.
The first filter cover 330 and/or the second filter cover 350 are/is bonded to the filter body 340, which is favorable for connection tightness and tightness between the filter body 340 and the first filter cover 330 and the second filter cover 350, so as to ensure that air flow cannot be discharged from gaps between the filter body 340 and the first filter cover 330 and the second filter cover 350 respectively, and ensure the filtering effect.
In this embodiment, the cover body 322 of the cover body 320 and the first filter cover 330 are sealed by the first sealing ring 370, and the first sealing ring 370 surrounds the second air port 321, that is, the orthographic projection of the first sealing ring 370 on the cover body 322 is located at the outer peripheral side of the second air port 321.
Specifically, the diameter of the first sealing ring 370 is smaller than that of the first filter cap 330, so that after the first filter cap 330 is screwed with the ring body 323 until the first filter cap 330 abuts against the cap main body 322, the first sealing ring 370 is tightly pressed between the cap main body 322 and the first filter cap 330, so that a gap between the cap main body 322 and the first filter cap 330 is blocked, and air flow is prevented from directly entering the gap between the cap body 320 and the first filter cap 330 and being discharged from the second air port 321.
Of course, in the embodiment where the first air port 313 is an air outlet, the sealing between the inner wall of the second end 312 and the first filter cover 330 is achieved by the first sealing ring 370.
That is, any sealing between one of the cover 320 and the second end 312 and the first filter cover 330 may be performed by the first sealing ring 370.
In this embodiment, the first filter cover 330 of the filter assembly further has an extension tube portion 332 extending into the second air port 321, and the outer peripheral wall of the extension tube portion 332 and the inner peripheral wall of the second air port 321 are sealed by a second sealing ring 380, so as to further increase the connection tightness between the filter assembly and the housing, and prevent the air flow filtered by the filter assembly from being directly introduced into the second air port 321 from the gap between the first filter cover 330 and the cover body 320. The purified gas in the filter 340 can enter the second air port 321 from the extension pipe 332 and be discharged out of the bacteria-isolating filter 300.
More specifically, an annular mounting groove 333 surrounding in the circumferential direction may be disposed on the outer circumferential wall of the extension pipe 332, and the second seal ring 380 is located between the mounting groove 333 and the inner circumferential wall of the second air port 321, so that the second seal ring 380 can be prevented from moving in the length direction of the extension pipe 332 by the mounting groove 333, and the effects of limiting and being convenient for sleeving are achieved.
Of course, in the embodiment in which the first air port 313 is an air outlet, the extension tube 332 disposed on the first filter cover 330 extends into the first air port 313, and the outer peripheral wall of the extension tube 332 and the inner peripheral wall of the first air port 313 are sealed by the second sealing ring 380.
In this embodiment, the filter material 340 is mainly made of a composite material, and the composite material includes a coarse interception net 301, an antibacterial material layer 302, a skeleton supporting layer 303, a melt-blown polypropylene filtering layer 304, activated carbon fibers 305 and an inner supporting net 306, which are sequentially stacked.
The air flow entering from the air inlet sequentially passes through the coarse interception net 301, the antibacterial material layer 302, the framework supporting layer 303, the melt-blown polypropylene filtering layer 304, the activated carbon fibers 305 and the inner layer support, and the coarse interception net 301 mainly serves to intercept large particle impurities such as dust, fibers and smoke and the like to protect the antibacterial material layer 302, the framework supporting layer 303, the melt-blown polypropylene filtering layer 304, the activated carbon fibers 305 and the inner layer supporting net 306. The antimicrobial material layer 302 acts to inhibit the growth and proliferation of bacteria on the filter media 340. The skeletal support layer 303 serves as a skeletal layer for the meltblown polypropylene filtration layer 304, maintaining the meltblown polypropylene filtration layer 304 shape undistorted throughout the life of the filter element. The melt blown polypropylene filter layer 304 serves to intercept most of the bacteria and small particle impurities and to fine filter. The activated carbon fibers 305 can be used to adsorb gaseous pollutants such as VOCs, so that the antibacterial effect of the filtration can be ensured by layer-by-layer filtration. The inner supporting net 306 is used for supporting the functions of the coarse intercepting net 301, the antibacterial material layer 302, the skeleton supporting layer 303, the melt-blown polypropylene filtering layer 304 and the activated carbon fibers 305, so as to maintain the shape of the whole filter material 340.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (10)
1. The testing method is applied to a testing system and is characterized by comprising an air pump, a bacteria carrying device, a bacteria collecting device and a bacteria removing device, wherein the air pump, the bacteria carrying device, a bacteria isolating filter element to be tested, the bacteria collecting device and the bacteria removing device are sequentially connected;
the method comprises the following steps:
respectively adding a bacterial solution, a bacterial collection liquid and a sterilizing liquid into the bacteria carrying device, the bacterial collection device and the bacterial removal device, wherein the bacterial concentration of the bacterial solution is C 0 ；
Starting an air pump to introduce air into the bacteria-carrying device until the purified gas amount output by the bacteria-isolating filter element to be tested reaches the nominal rated total purified gas amount;
detecting the bacterial concentration C of a bacterial collection liquid in the bacterial collection device 1 ；
By η= (C 0 -C 1 )/C 0 * And obtaining the bacterial interception efficiency eta of the bacterial isolation filter element to be detected by 100 percent.
2. The method according to claim 1, wherein the bacterial concentration C of the bacterial collection fluid in the bacterial collection device is detected 1 Comprises the following steps:
shaking up the bacterial collection liquid;
taking 1ml of the bacterial collection liquid out and placing the bacterial collection liquid into a bacterial culture medium;
culturing at 35-37 deg.c for 48 hr and recording colony number.
3. The testing method according to claim 1, wherein prior to the step of adding the bacterial solution, the bacterial collection fluid, and the bactericidal fluid to the bacteria-carrying device and the bacterial collection device, respectively, the method further comprises:
and (3) sterilizing the test system by using a sodium hypochlorite solution with the concentration of 5% for 30min, and then washing the test system by using pure water.
4. The testing method of claim 1, wherein the testing system further comprises a flow meter connected between the air pump and the bacteria-laden device;
starting an air pump to introduce air into the bacteria-carrying device until the purified gas output by the bacteria-isolating filter element to be tested reaches the nominal rated total purified gas amount, and stopping the process:
and stopping when the gas quantity L=vt output by the air pump in the operation test time t reaches the nominal rated total purified gas quantity of the to-be-tested bacteria-isolation filter element according to the air flow speed v measured by the flow meter.
5. A test system capable of realizing the test method of any one of claims 1-4, characterized in that the test system comprises an air pump, a bacteria-carrying device, a bacteria-collecting device and a bacteria-removing device which are sequentially connected, wherein the bacteria-carrying device and the bacteria-collecting device are connected by a bacteria-isolating filter element to be tested.
6. The test system of claim 5, wherein the bacteria-carrying device, the bacteria-collecting device, and the bacteria-removing device each comprise a container, and an air inlet tube and an air outlet tube extending into the container, wherein the height of the air outlet end of the air inlet tube is lower than the height of the air inlet end of the air outlet tube, and the air outlet end of the air inlet tube is positioned below the liquid level of the solution when the solution is in the container;
and/or the number of the groups of groups,
the test system further comprises a one-way valve connected between the bacteria-collecting device and the bacteria-removing device;
and/or the number of the groups of groups,
the test system further comprises a flowmeter connected between the air pump and the bacteria-carrying device;
and/or the number of the groups of groups,
the test system further comprises a first air pressure valve connected between the air inlet of the to-be-tested bacteria-isolation filter element and the bacteria-carrying device, and a second air pressure valve connected between the air outlet of the to-be-tested bacteria-isolation filter element and the bacteria collecting device.
7. A bacterial isolation cartridge capable of being tested by the test method of any one of claims 1-4, wherein the bacterial isolation cartridge comprises a housing and a filter assembly;
the shell comprises a shell body and a cover body, wherein the first end of the shell body is open, the second end of the shell body is closed, and a first air port is formed in the second end of the shell body;
the cover body is detachably connected to the opening end of the shell and is provided with a second air port;
the shell and the cover body jointly enclose a cavity, and the first air port and the second air port are communicated with the cavity;
the filter material component is positioned in the cavity, and one of the cover body and the second end is detachably connected with the filter material component and is in sealing fit with the filter material component.
8. The filter element of claim 7, wherein the filter element assembly comprises a filter element and first and second filter covers secured to opposite ends of the filter element;
one of the cover body and the second end is detachably connected with the first filter material cover and is in sealing fit with the first filter material cover, and a gap is reserved between the other cover body and the second filter material cover.
9. The bacterial cartridge of claim 8, wherein one of the cap and the second end is sealed to the first filter cap by a first seal ring;
and/or the number of the groups of groups,
one of the cover body and the second end is in threaded fit with the first filter material cover to realize detachable connection;
and/or the number of the groups of groups,
the first filter material cover and/or the second filter material cover are/is bonded with the filter material body;
and/or the number of the groups of groups,
the filter material body is made of a composite material, and the composite material comprises a coarse-effect interception net, an antibacterial material layer, a framework supporting layer, a melt-blown polypropylene filter layer, activated carbon fibers and an inner layer supporting net which are sequentially laminated and distributed.
10. The bacterial barrier cartridge of claim 7, wherein one of the cover and the housing is provided with first internal threads and the other is provided with first external threads that mate with the first internal threads;
and/or the number of the groups of groups,
the filter material component is provided with an extension pipe part extending into the first air port or the second air port, the outer peripheral wall of the extension pipe part is sealed with the inner peripheral wall of the first air port through a second sealing ring, or the outer peripheral wall of the extension pipe part is sealed with the inner peripheral wall of the second air port through a second sealing ring;
and/or the number of the groups of groups,
the other of the cover body and the second end with the filter material component is provided with a plurality of ultraviolet lamps distributed in an annular array on the peripheral wall of the shell, and the ultraviolet lamps are used for irradiating ultraviolet light towards the inside of the shell.
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| CN202311714131.1A CN117740645A (en) | 2023-12-13 | 2023-12-13 | Test method, system and bacteria-isolation filter element |
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| CN202311714131.1A CN117740645A (en) | 2023-12-13 | 2023-12-13 | Test method, system and bacteria-isolation filter element |
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