CN107655725A - A kind of super low concentration particle sampling pipette tips suitable for low temperature and high relative humidity environment - Google Patents
A kind of super low concentration particle sampling pipette tips suitable for low temperature and high relative humidity environment Download PDFInfo
- Publication number
- CN107655725A CN107655725A CN201710829923.1A CN201710829923A CN107655725A CN 107655725 A CN107655725 A CN 107655725A CN 201710829923 A CN201710829923 A CN 201710829923A CN 107655725 A CN107655725 A CN 107655725A
- Authority
- CN
- China
- Prior art keywords
- sampling
- sampling head
- pipette tips
- low concentration
- relative humidity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005070 sampling Methods 0.000 title claims abstract description 111
- 239000002245 particle Substances 0.000 title claims abstract description 29
- 239000012528 membrane Substances 0.000 claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 230000000712 assembly Effects 0.000 claims description 18
- 238000000429 assembly Methods 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 13
- 238000012856 packing Methods 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 36
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 239000012716 precipitator Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
- G01N1/2205—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling with filters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
- G01N1/2258—Sampling from a flowing stream of gas in a stack or chimney
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
- G01N1/2258—Sampling from a flowing stream of gas in a stack or chimney
- G01N2001/2261—Sampling from a flowing stream of gas in a stack or chimney preventing condensation (heating lines)
Abstract
The present invention relates to a kind of super low concentration particle sampling pipette tips suitable for low temperature and high relative humidity environment, it includes heater, sampling head and base, offered on described base for accommodate described heater heater placement duct, offer sample gas flow passage, offer for accommodate described sampling head sampling head resettlement groove, offer for connecting described sample gas flow passage and described sampling head so that sample gas can enter the first through hole of described sample gas flow passage from described sampling head.The super low concentration particle sampling pipette tips of the present invention can carry out overall heating to filter membrane and by the sample gas passage before and after filter membrane, Pitot tube pipe shaft can be heated simultaneously, it ensure that in sample gas passage and Pitot tube and ponding do not occur, and filter membrane is not wetted, influence of the aqueous water to super low concentration particle sampling under low temperature and high relative humidity environment is avoided.
Description
Technical field
The invention belongs to particle sampling device field, and in particular to a kind of super low concentration suitable for low temperature and high relative humidity environment
Particle sampling pipette tips.
Background technology
With pushing forward comprehensively for domestic coal-burning power plant's minimum discharge transformation, particle concentration drops to super in chimney inlet flue gas
Low emission limit value 10mg/m3, even 5mg/m3Within.In general, coal-fired plant flue gas has first passed through desulfurization before chimney is entered
The environmental protection equipments such as tower, wet electrical dust precipitator, low temperature and high relative humidity flue gas environment is finally formed in chimney, had a strong impact on existing super
The normal use of low concentrations of particulates thing sampling apparatus.
A large amount of spot sampling test jobs show that existing super low concentration particle sampling device makes under low temperature and high relative humidity environment
Used time, exist the easy ponding of pipette tips, filter membrane cracky, can not sample for a long time, sampled result distortion the problems such as.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of super low concentration particulate matter suitable for low temperature and high relative humidity environment
Sampling gun head.
To solve above technical problem, the present invention adopts the following technical scheme that：
A kind of super low concentration particle sampling pipette tips suitable for low temperature and high relative humidity environment, it includes heater, sampling head and bottom
, the heater for accommodating described heater is offered on described base and disposes duct, offer sample gas
Flow passage, offer for accommodate described sampling head sampling head resettlement groove, offer for connecting described sampling gas
Body flow passage and described sampling head are so that sample gas can enter described sample gas from described sampling head
The first through hole of flow passage.
Specifically, described sampling head resettlement groove include Part I, one end be connected with described Part I and
The Part II extended along the length direction of described base, described sampling head include being arranged in described Part I
Filter assemblies, be arranged in described Part II and with the sampling mouth for the passage for supplying described sample gas to pass through, institute
It is connected between the filter assemblies and described base stated formed with the gas compartment, described filter assemblies with described sampling mouth
And the passage of described sampling mouth is connected with the described gas compartment, the described gas compartment by described first through hole with
Described sample gas flow passage is connected.
Preferably, length direction extension of the described heater placement duct along described base.
It is further preferred that described heater placement duct has multiple and is symmetricly set on described sampling head placement
The both sides of groove.
According to a preferred embodiment, described Part I include be connected with described Part II the first side wall,
Outside be connected on the downside of described the first side wall the first bottom surface, upside is with being connected on the inside of the first described bottom surface
Second sidewall, the second bottom surface with being connected on the downside of described second sidewall, described first through hole are opened in described the
On two bottom surfaces.
Specifically, described filter assemblies include with cavity and downward opening support box, are arranged in described support box
Filter membrane, be connected with described support box for the lid being fixed on described filter membrane in described support box, described support box
It is connected with described sampling mouth and the cavity of described support box is connected with the passage of described sampling mouth, described lid position
Offer the second through hole between the first described bottom surface and described support box and on described lid, it is described support box, described
Lid, described second sidewall and the second described bottom surface form the described gas compartment, described filter membrane is positioned at described
It is divided into upper and lower part in the gas compartment and by the described gas compartment, the cavity of described support box is logical with described sampling mouth
The connectivity part in road is located at described top.
More specifically, described filter assemblies also include being arranged on the upper surface of described filter membrane and have multiple through holes
First support member, the lower surface for being arranged on described filter membrane and the second support member with multiple through holes, be fixedly installed on it is described
Support box on support platform, be arranged between described support platform and the first described support member the first packing ring, set
Second packing ring between described lid and the second described support member.
Specifically, described super low concentration particle sampling pipette tips also include being arranged on described sampling head resettlement groove and institute
Sealing gasket between the sampling head stated, be connected with described sampling head resettlement groove for by described sampling head pressure located at described
Sampling head resettlement groove in fastener.
More specifically, described fastener includes with cavity and downward opening connection body, formation are in described company
The handle on the upper surface of body is connect, described connection body is mutually threadedly coupled with described sampling head resettlement groove and described mistake
Component is filtered in the cavity of described connection body.
Specifically, described super low concentration particle sampling pipette tips also include temperature sensor and Pitot tube, described bottom
Formed with the temperature sensor placement duct for accommodating described temperature sensor, for accommodating described Pitot tube on seat
Pitot tube resettlement groove, length direction extension of the described Pitot tube resettlement groove along described base.
Due to the implementation of above technical scheme, the present invention has the following advantages that compared with prior art：
The super low concentration particle sampling pipette tips of the present invention can be carried out to filter membrane and by the sample gas passage before and after filter membrane
Overall heating, while Pitot tube pipe shaft can be heated, it ensure that in sample gas passage and Pitot tube and ponding do not occur,
And filter membrane is not wetted, influence of the aqueous water to super low concentration particle sampling under low temperature and high relative humidity environment is avoided.
Brief description of the drawings
Accompanying drawing 1 is the structural representation of base；
Accompanying drawing 2 is the structural representation of sampling head；
Accompanying drawing 3 is the structural representation of sealing gasket；
Accompanying drawing 4 is the structural representation of fastener；
Wherein, 1, base；2nd, sampling head；3rd, sealing gasket；4th, fastener；5th, temperature sensor placement duct；6th, heater is pacified
Put duct；7th, Pitot tube resettlement groove；8th, sample gas flow passage；9th, sampling head resettlement groove；11st, first through hole；12nd, sample
Mouth；13rd, box is held in the palm；14th, support platform；15th, the first support member；16th, the second support member；17th, filter membrane；18th, lid；19th, the first pad
Circle；20th, second packing ring；41st, body is connected；42nd, handle；91st, Part I；92nd, Part II；911st, the first side wall；912、
First bottom surface；913rd, second sidewall；914th, the second bottom surface.
Embodiment
Embodiments of the invention are described in detail below in conjunction with the accompanying drawings.
The invention provides a kind of super low concentration particle sampling pipette tips suitable for low temperature and high relative humidity environment, in the present invention
The noun of locality such as front and rear up and down is to do what is defined with the orientation of super low concentration particle sampling pipette tips when in use, wherein, make
Used time, sampling head 2 are located at the upper surface of base 1（I.e. the orientation of Fig. 1 center bases 1 is orientation when using）, the length of base 1
Direction refers to the left and right directions in Fig. 1.
Super low concentration particle sampling pipette tips include base 1, sampling head 2, heater, temperature sensor, Pitot tube, close
Packing 3 and fastener 4.
As shown in Figure 1, offered on the upper surface of base 1 for accommodate sampling head 2 sampling head resettlement groove 9, following table
The Pitot tube resettlement groove 7 for accommodating Pitot tube is offered on face, the heating for accommodating heater is further opened with base 1
Device placement duct 6, the temperature sensor placement duct 5 for accommodating temperature sensor, sample gas flow passage 8 and first
Through hole 11.Sealing gasket 3 is arranged between sampling head resettlement groove 9 and sampling head 2, and sampling head 2 and base 1 are realized by fastener 4
Compress sealing.
In the present embodiment, base 1 is process by whole aluminium block.
Length direction extension of the Pitot tube resettlement groove 7 along base 1, and both ends extend through the left and right ends face of base 1.
Temperature sensor disposes length direction extension of the duct 5 along base 1, and left end is closed, and right-hand member is through base 1
Right side, during mounting temperature sensor, the right-hand member in duct 5 is disposed to insert from temperature sensor temperature sensor.
Heater disposes length direction extension of the duct 6 along base 1, and left end is closed, and right-hand member runs through the right side of base 1
End face.In the present embodiment, heater is heating rod, and during installation, the right side that heating rod self-heating apparatus disposes duct 6 is inserted
Enter.
There are both sides that are multiple and being symmetricly set on sampling head resettlement groove 9 in heater placement duct 6, specifically, such as Fig. 1 institutes
Show, heater placement duct 6 there are two and is symmetricly set on the down either side of sampling head resettlement groove 9, is symmetricly set on Pitot
Above the both sides of pipe resettlement groove 7, so that heater can be heated preferably to sampling head 2 and Pitot tube.
Length direction extension of the sample gas flow passage 8 along base 1, and left end is closed, right-hand member runs through the right side of base 1
End face, upside is connected by first through hole 11 with sampling head 2 so that sample gas can enter sampling gas from sampling head 2
Body flow passage 8.
Sampling head resettlement groove 9 includes Part I 91, one end and is connected with Part I 91 and along the length of base 1
The Part II 92 of direction extension, as shown in figure 1, Part I 91 is generally cylindrical, Part II 92 is elongated.Specifically
Ground, Part I 91 includes the first side wall 911 that is connected with Part II 92, outside is connected with the downside of the first side wall 911
Under second sidewall 913 and second sidewall 913 that the first bottom surface 912, the upside connect is connected with the inner side of the first bottom surface 912
The second bottom surface 914 that side is connected.
First bottom surface 912 is in annular, as shown in figure 3, sealing gasket 3 is also in annular, sealing gasket 3 is located at the first bottom surface
So as to ensureing the sealing between sampling head 2 and base 1 between 912 and sampling head 2.Second bottom surface 914 is rounded, the second bottom surface
914 are located at the top of sample gas flow passage 8, and first through hole 11 is opened on the second bottom surface 914 and circulated with sample gas
Duct 8 is connected.The internal diameter for the cylinder that the first side wall 911 is formed is more than the internal diameter for the cylinder that second sidewall 913 is formed.
As shown in Fig. 2 sampling head 2 include be arranged in Part I 91 filter assemblies, be arranged in Part II 92
And with the sampling mouth 12 of the passage passed through for sample gas, sampling mouth 12 is in question mark type.
Sampling head 2 in Fig. 2 is in actual use, it is necessary to turned upside down.Orientation when being actually used below with sampling head 2
The restriction of above-below direction is carried out, i.e., following lower sections is the top in Fig. 2, and following tops is the lower section in Fig. 2.
Filter assemblies include with cavity and it is downward opening support box 13, be arranged on support box 13 in filter membrane 17, with support box
13 are connected for filter membrane 17 to be fixed on to the lid 18 held in the palm in box 13, be arranged on the upper surface of filter membrane 17 and has multiple through holes
The first support member 15, be arranged on filter membrane 17 lower surface and with multiple through holes the second support member 16, be fixedly installed on support
Support platform 14 on box 13, the first packing ring 19 being arranged between the support member 15 of support platform 14 and first, it is arranged on lid
18 and the second second packing ring 20 between support member 16.
Hold in the palm on the outer surface of box 13 formed with external screw thread, formed with internal thread on the inner surface of lid 18, support box 13 it is upper
Face seal, lower surface are opening, and the second through hole is offered on lid 18 and the second through hole is corresponding with holding in the palm the opening of box 13.
During assembling, by the first packing ring 19, the first support member 15, filter membrane 17, the second support member 16, second packing ring 20 from upper and
Under be arranged between support platform 14 and lid 18 successively layer, then lid 18 with support box 13 connected by internal and external threads
Connect, realize the assembling of filter assemblies, the filter assemblies assembled are positioned in sampling head resettlement groove 9 and so that lid 18 is located at
Between first bottom surface 912 and support box 13, specifically, being provided with sealing gasket 3 on the first bottom surface 912, lid 18 is pressed on sealing gasket 3
On.
Formed with the gas compartment between filter assemblies and base 1, filter assemblies are connected with sampling mouth 12 and sample mouth 12
Passage be connected with the gas compartment, specifically, support box 13 with sample mouth 12 be connected and hold in the palm box 13 cavity and sample mouth 12
Passage be connected, support box 13, lid 18, the bottom surface 914 of second sidewall 913 and second form the gas compartment, and first through hole 11 makes
The gas compartment is obtained with sample gas flow passage 8 to be connected.Filter membrane 17 is located in the gas compartment and the gas compartment is divided into top
And bottom, ask the cavity of box 13 and the connectivity part of the passage of sampling mouth 12 to be located at the top of the gas compartment.The gas compartment passes through
One through hole 11 is connected with sample gas flow passage 8.During sampling, sample gas enters the gas compartment from the passage for sampling mouth 12
Top, then after the filtering of filter membrane 17, carry out the bottom of the gas compartment, then enter sample gas through first through hole 11 and circulate
Duct 8.
In the present embodiment, the first support member 15 and the second support member 16 are the air rings made of polytetrafluoroethylmaterial material
Circle, is evenly distributed with multiple through holes thereon.Sealing gasket 3 and the ring washer made of polytetrafluoroethylmaterial material.
As shown in figure 4, fastener 4 includes with cavity and downward opening connection body 41, formation are in connection body 41
Upper surface on handle 42, handle 42 is in cross.
The upside of the first side wall 911 is formed with screw thread, formed with first on the lateral wall of the connection body 41 of fastener 4
The screw thread that screw thread in side wall 911 is engaged, so that fastener 4 is connected through a screw thread with sampling head resettlement groove 9.Assembling
When, sealing gasket 3 is positioned on the first bottom surface 912, then sampling head 2 is placed in sampling head resettlement groove 9, then by fastener
4 lids are located on filter assemblies and filter assemblies is then connected body by screw thread in the cavity of connection body 41
41 are connected with sampling head resettlement groove 9.
In the present embodiment, fastener 4 is to be integrally formed to be made by polytetrafluoroethylmaterial material.
The present invention is described in detail above, its object is to allow the personage for being familiar with this art to understand this
The content of invention is simultaneously carried out, and it is not intended to limit the scope of the present invention, all Spirit Essence institutes according to the present invention
The equivalent change or modification of work, it should all cover within the scope of the present invention.
Claims (10)
- A kind of 1. super low concentration particle sampling pipette tips suitable for low temperature and high relative humidity environment, it is characterised in that：It includes heating dress Put, sampling head（2）And base（1）, described base（1）On offer heater peace for accommodating described heater Put duct（6）, offer sample gas flow passage（8）, offer for accommodating described sampling head（2）Sampling head placement Groove（9）, offer for connecting described sample gas flow passage（8）With described sampling head（2）So that sampling gas Body can be from described sampling head（2）Into described sample gas flow passage（8）First through hole（11）.
- 2. the super low concentration particle sampling pipette tips according to claim 1 suitable for low temperature and high relative humidity environment, its feature exists In：Described sampling head resettlement groove（9）Including Part I（91）, one end and described Part I（91）It is connected and edge Described base（1）Length direction extension Part II（92）, described sampling head（2）Including being arranged on described the A part（91）Interior filter assemblies, it is arranged on described Part II（92）What sample gas that is interior and having confession described passed through The sampling mouth of passage（12）, described filter assemblies and described base（1）Between formed with the gas compartment, described filtering group Part and described sampling mouth（12）It is connected and described sampling mouth（12）Passage be connected with the described gas compartment, it is described The gas compartment pass through described first through hole（11）With described sample gas flow passage（8）It is connected.
- 3. the super low concentration particle sampling pipette tips according to claim 2 suitable for low temperature and high relative humidity environment, its feature exists In：Described heater placement duct（6）Along described base（1）Length direction extension.
- 4. the super low concentration particle sampling pipette tips according to claim 3 suitable for low temperature and high relative humidity environment, its feature exists In：Described heater placement duct（6）Have multiple and be symmetricly set on described sampling head resettlement groove（9）Both sides.
- 5. the super low concentration particle sampling pipette tips according to claim 2 suitable for low temperature and high relative humidity environment, its feature exists In：Described Part I（91）Including with described Part II（92）The first side wall being connected（911）, outside with it is described The first side wall（911）The first bottom surface for being connected of downside（912）, upside and the first described bottom surface（912）Inner side phase The second sidewall of connection（913）And described second sidewall（913）The second bottom surface for being connected of downside（914）, described One through hole（11）It is opened in the second described bottom surface（914）On.
- 6. the super low concentration particle sampling pipette tips according to claim 5 suitable for low temperature and high relative humidity environment, its feature exists In：Described filter assemblies include having cavity and downward opening support box（13）, be arranged on described support box（13）Interior filter Film（17）And described support box（13）It is connected for by described filter membrane（17）It is fixed on described support box（13）Interior lid （18）, described support box（13）With described sampling mouth（12）It is connected and described support box（13）Cavity and described sampling Mouth（12）Passage be connected, described lid（18）Positioned at the first described bottom surface（912）With described support box（13）Between And described lid（18）On offer the second through hole, described support box（13）, described lid（18）, described second sidewall （913）With the second described bottom surface（914）Form the described gas compartment, described filter membrane（17）Positioned at the described gas compartment It is interior and the described gas compartment is divided into upper and lower part, described support box（13）Cavity and described sampling mouth（12）It is logical The connectivity part in road is located at described top.
- 7. the super low concentration particle sampling pipette tips according to claim 6 suitable for low temperature and high relative humidity environment, its feature exists In：Described filter assemblies also include being arranged on described filter membrane（17）Upper surface and with multiple through holes the first support member （15）, be arranged on described filter membrane（17）Lower surface and with multiple through holes the second support member（16）, be fixedly installed on institute The support box stated（13）On support platform（14）, be arranged on described support platform（14）With the first described support member（15）It Between the first packing ring（19）, be arranged on described lid（18）With the second described support member（16）Between second packing ring （20）.
- 8. the super low concentration particle sampling pipette tips according to claim 1 suitable for low temperature and high relative humidity environment, its feature exists In：Described super low concentration particle sampling pipette tips also include being arranged on described sampling head resettlement groove（9）With described sampling Head（2）Between sealing gasket（3）And described sampling head resettlement groove（9）It is connected for by described sampling head（2）Pressure is located at Described sampling head resettlement groove（9）Interior fastener（4）.
- 9. the super low concentration particle sampling pipette tips according to claim 8 suitable for low temperature and high relative humidity environment, its feature exists In：Described fastener（4）Including with cavity and downward opening connection body（41）, formed in described connection body （41）Upper surface on handle（42）, described connection body（41）With described sampling head resettlement groove（9）Mutually it is threadedly coupled And described filter assemblies are located at described connection body（41）Cavity in.
- 10. the super low concentration particle sampling pipette tips according to claim 1 suitable for low temperature and high relative humidity environment, its feature exists In：Described super low concentration particle sampling pipette tips also include temperature sensor and Pitot tube, described base（1）On formed with Temperature sensor for accommodating described temperature sensor disposes duct（5）, Pitot tube for accommodating described Pitot tube Resettlement groove（7）, described Pitot tube resettlement groove（7）Along described base（1）Length direction extension.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710829923.1A CN107655725A (en) | 2017-09-15 | 2017-09-15 | A kind of super low concentration particle sampling pipette tips suitable for low temperature and high relative humidity environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710829923.1A CN107655725A (en) | 2017-09-15 | 2017-09-15 | A kind of super low concentration particle sampling pipette tips suitable for low temperature and high relative humidity environment |
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| Publication Number | Publication Date |
|---|---|
| CN107655725A true CN107655725A (en) | 2018-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710829923.1A Pending CN107655725A (en) | 2017-09-15 | 2017-09-15 | A kind of super low concentration particle sampling pipette tips suitable for low temperature and high relative humidity environment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112588041A (en) * | 2020-12-09 | 2021-04-02 | 河北快特环保科技有限公司 | Filter membrane clamp for fluoride automatic determinator |
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