CN213555623U

CN213555623U - Open-air water sample filter equipment

Info

Publication number: CN213555623U
Application number: CN202022541863.3U
Authority: CN
Inventors: 窦永静; 张少庆; 王让虎; 谢致敬
Original assignee: Taiyuan Normal University
Current assignee: Taiyuan Normal University
Priority date: 2020-11-06
Filing date: 2020-11-06
Publication date: 2021-06-29
Anticipated expiration: 2030-11-06

Abstract

The utility model discloses a field water sample filtering device, which relates to the technical field of sample pretreatment devices and comprises a cylinder body, a cylinder cover and a filter head, wherein the upper end of the cylinder body is open and is used for containing a water sample to be filtered, the cylinder cover is detachably arranged at the upper end opening of the cylinder body and can seal the upper end opening of the cylinder body, the cylinder cover is provided with a pressure gauge and an air cock, the pressure gauge is used for detecting the pressure in the cylinder body, the air cock is used for filling gas into the cylinder body and changing the pressure in the cylinder body, the filter head is detachably arranged at the lower end of the cylinder body and is communicated with the inside of the cylinder body, the filter head comprises an upper cover, a filter core and a lower cover, the filter core is detachably arranged between the upper cover and the lower cover and is used for filtering suspended matters in the water sample, the lower end of the filter head is provided with, and the sampling precision is improved.

Description

Open-air water sample filter equipment

Technical Field

The utility model relates to a processing apparatus technical field before the sample specifically relates to an open-air water sample filter equipment.

Background

Water quality monitoring generally needs to bring a water sample collected in the field back to a laboratory for filtration by using a filter membrane, and determine physical and chemical indexes of suspended matters and filtered water in the water sample so as to achieve the purposes of monitoring water body conditions and other scientific researches and provide data support for reasonable utilization and protection of water resources.

The suspended matter in water refers to the solid matter suspended in water, including inorganic matter, organic matter, silt, clay, microbe, etc. which are insoluble in water. The transparency of the water body can be reduced by the suspended matters in the water, the turbidity is increased, the dissolved oxygen can be prevented from diffusing to the lower part of the water body if the suspended matters are too much, the respiration and the metabolism of aquatic organisms are influenced, even the fishes are suffocated and die, and meanwhile, the channel can be silted due to too much suspension.

Therefore, in the environmental monitoring work, a water sample needs to be filtered, and dissolved substances and suspended substances contained in the water body are respectively measured. It is common practice to refrigerate water samples collected in the field and transport them to the laboratory for filtration. However, as the conditions of the water sample change in the transportation process, more or less substance exchange can occur between dissolved substances and suspended substances contained in the water body, and the laboratory detection result is difficult to restore the actual state of the water sample; meanwhile, the concentration of suspended matters in the natural water body is small, the total volume of the water samples accumulated from a plurality of sampling positions is huge, and the collected water samples are large in quantity, heavy in weight, difficult to carry, time-consuming and labor-consuming. At present, thereby adopt the nature method of stewing to filter in the field generally and acquire water sample clear solution and suspended solid, but the time that the nature method of stewing needs is longer and can not filter completely, can't realize the accurate ration to the suspended solid, consequently need one kind and can carry out rapid filtration's device to the water sample at the sample scene urgently.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an open-air water sample filter equipment to solve the problem that above-mentioned prior art exists, realize the on-the-spot filtration to open-air water sample, and improve the sampling precision.

In order to achieve the above object, the utility model provides a following scheme:

the utility model provides a field water sample filtering device, which comprises a cylinder body, a cylinder cover and a filter head, wherein the upper end of the cylinder body is provided with an opening, the water tank body is used for containing water samples to be filtered, the tank cover is detachably arranged at the opening at the upper end of the tank body, the upper end opening of the cylinder body can be sealed, the cylinder cover is provided with a pressure gauge and an air tap, the pressure gauge is used for detecting the pressure in the cylinder body, the air tap is used for filling air into the cylinder body and changing the pressure in the cylinder body, the filter head is detachably arranged at the lower end of the cylinder body, and is communicated with the interior of the cylinder body, the filter head comprises an upper cover, a filter element and a lower cover, the filter element is detachably arranged between the upper cover and the lower cover, the filter core is used for filtering the suspended solid in the water sample, the filter tip is installed to the filter head lower extreme, the filter tip with the filter head intercommunication, just the filter tip is used for the water sample discharge after will filtering.

Preferably, the cylinder body is cylindric, the cylinder cap is circular, just the cylinder body with the cylinder cap is transparent organic glass and makes.

Preferably, the cylinder body upper end is equipped with the external screw thread, the cylinder cap outer fringe is equipped with annular arch, be equipped with the internal thread in the annular arch, the cylinder cap cover is located cylinder body upper end periphery, annular arch with cylinder body threaded connection, just annular arch with the cover is equipped with the first sealed pad of round between the cylinder body upper end, the inner wall contact of first sealed pad the cylinder body outer wall, the outer wall contact of first sealed pad the protruding inner wall of annular.

Preferably, a water outlet hole is formed in the middle of the lower end of the cylinder body, a guide pipe is arranged at the position, corresponding to the water outlet hole, of the lower end of the cylinder body, the upper end of the guide pipe is fixedly connected and communicated with the cylinder body, the lower end of the guide pipe is detachably connected with the upper cover, and the guide pipe is communicated with the inside of the filter head.

Preferably, the cylinder body lower extreme is equipped with a first solid fixed ring, first solid fixed ring cover is located the pipe periphery, just first solid fixed ring's upper end is fixed the cylinder body lower extreme, first solid fixed ring's inner wall with the outer wall fixed connection of pipe, it is sealed to establish a second on the pipe still to overlap, the sealed upper end contact of second first solid fixed ring lower extreme, the sealed lower extreme contact of second the upper end of upper cover.

Preferably, the filter head is cylindric, just the lower cover upper end is equipped with down the mounting groove, the mounting groove can communicate with each other with the external world down, on cover and be equipped with a plurality of through-holes, the through-hole centers on the center pin circumference of upper cover evenly sets up, just the through-hole is close to the upper cover edge, cover down and be equipped with a plurality of screw holes, and a through-hole corresponds a screw hole, passes in proper order through the bolt the through-hole with the screw hole is connected the upper cover with the lower cover, just the bolt lower extreme with screw hole threaded connection, the filter core can imbed in the mounting groove down.

Preferably, the upper cover with still be equipped with the third sealed pad between the lower cover, the sealed cover of third is located the filter core periphery, just the sealed inner wall contact of pad of third the filter core outer wall, the sealed up end contact of third the upper cover lower extreme, the sealed lower end contact of pad of third the lower extreme upper end of lower cover.

Preferably, the lower end of the guide pipe is provided with external threads, the upper end of the upper cover is provided with an upper connecting hole, the inner wall of the upper connecting hole is provided with threads, and the lower end of the guide pipe extends into the upper connecting hole and is in threaded connection with the upper connecting hole; the lower extreme of lower cover is equipped with down the connecting hole, lower connecting hole intercommunication lower mounting groove and external world, the inner wall of lower connecting hole is equipped with the screw thread, the upper end of filter tip is equipped with the external screw thread, just the filter tip upper end stretch into extremely in the lower connecting hole, and with lower connecting hole threaded connection, the lower extreme of filter tip is to keeping away from the direction of filter head extends.

Preferably, the filter tip periphery cover is equipped with the solid fixed ring of a second, the solid fixed ring's of second upper end is fixed the lower extreme of lower cover, the solid fixed ring's of second inner wall is fixed the outer wall of filter tip, it is sealed that still the cover is equipped with a fourth on the filter tip, the sealed inner wall contact of pad of fourth the outer wall of filter tip, the sealed up end contact of pad of fourth the lower terminal surface of lower cover, the sealed lower terminal surface contact of pad of fourth the solid fixed ring's of second up end.

Preferably, the filter core includes filter membrane and backup pad, be equipped with a plurality of filtration pores in the backup pad, the filter membrane is used for filtering the water sample, the backup pad is used for supporting the filter membrane, it is used for the water sample to pass through to filter the pore.

The utility model discloses for prior art gain following technological effect:

the utility model provides an open-air water sample filter equipment, be equipped with manometer and air cock on the cylinder cap, the manometer is used for pressure in the real-time detection cylinder body, also guarantee filterable security when guaranteeing filtering speed, the air cock is used for filling gas and changing pressure in the cylinder body in to the cylinder body, filter demountable installation is at the cylinder body lower extreme, and with the inside intercommunication of cylinder body, be used for filtering discharge water sample in the cylinder body, the filter is installed to the filter lower extreme, filter and filter intercommunication, through the filter to the water sample of filtering through the filter, collect the water sample after filtering, hold in the cylinder body and remain the filtration water sample, be connected with outside high-pressure gas production pipe through the air cock, inflate the pressurization for the cylinder body is inside, accelerate filtering speed, reduce filter time, conveniently filter at the sampling scene, each component reaction in the water sample has been avoided, the sampling precision has been improved, the, Filter core and lower cover, filter core demountable installation are between upper cover and lower cover to make things convenient for taking out and installing of filter core, so that filter the completion back, to the collection of the suspended solid of crossing to the filtration, realize the on-the-spot filtration of water sample, and the suspended solid of crossing to filter is when collecting, and for the collection of direct water sample, it is less to occupy the volume, saves labour and cost.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a field water sample filtering device provided by the present invention;

FIG. 2 is a schematic structural diagram of a filter head in the field water sample filtering device provided by the present invention;

FIG. 3 is a top view of a filter element in the field water sample filtering device provided by the present invention;

in the figure: 1-cylinder body, 2-cylinder cover, 3-first sealing gasket, 4-pressure gauge, 5-air nozzle, 6-upper cover, 7-lower cover, 8-filter core, 9-conduit, 10-filter tip, 11-first fixing ring, 12-second sealing gasket, 13-upper connecting hole, 14-bolt, 15-third sealing gasket, 16-lower connecting hole, 17-second fixing ring and 18-fourth sealing gasket.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The utility model aims at providing an open-air water sample filter equipment to solve current open-air water sample and filter the technical problem that can't effectively filter at the scene.

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.

As shown in figures 1-3, the utility model provides a field water sample filtering device, including cylinder body 1, cylinder cap 2 and filter head, cylinder body 1 upper end opening, and be used for holding the water sample of waiting to filter in the cylinder body 1, cylinder cap 2 demountable installation is at the upper end opening of cylinder body 1, and can be sealed to the upper end opening of cylinder body 1, when needing to add the water sample in cylinder body 1, open cylinder cap 2, through the inside water sample that adds of cylinder body 1 upper end opening, in order to realize continuous filtration, be equipped with manometer 4 and air cock 5 on cylinder cap 2, manometer 4 is used for detecting the pressure in cylinder body 1 in real time, guarantee the security of filtering when guaranteeing the filtration speed, air cock 5 is used for filling gas and changing the pressure in cylinder body 1, hold the water sample that remains to filter in the cylinder body 1, through air cock 5 with outside high-pressure inflating pipe connection, for inflating and pressurizing the inside of cylinder, the pressure is ensured to be 2-5 atmospheres, preferably 4 atmospheres, the filtering speed is accelerated, the filtering time is reduced, the filtering is convenient to be carried out on the sampling site, the reaction of each component in a water sample is avoided, the sampling precision is improved, the filter head is detachably arranged at the lower end of the cylinder body 1 and is communicated with the inside of the cylinder body 1, the filter head comprises an upper cover 6, a filter element 8 and a lower cover 7, the filter element 8 is detachably arranged between the upper cover 6 and the lower cover 7, the filter element 8 is used for filtering suspended matters in the water sample, so that the filter element 8 is convenient to take out and install, the filtered suspended matters are collected to realize the on-site filtering of the water sample after the filtering is finished, and the filtered suspended matters occupy smaller volume compared with the direct collection of the water sample when the filtered suspended matters are collected, the labor and the cost are saved, the filter tip 10 is arranged at the lower end of the filter head and is communicated with the filter, the water sample after will filtering is collected, and is more excellent, and the lower extreme of filter tip 10 is the bevel connection form, improves the drainage effect.

Specifically, cylinder body 1 is cylindric, and cylinder cap 2 is circular, and cylinder body 1 and cylinder cap 2 are transparent organic glass and make, and the convenience is to the observation of water sample surplus in the cylinder body 1, improves filtration treatment efficiency.

1 upper end of cylinder body is equipped with the external screw thread, 2 outer fringe of cylinder cap is equipped with annular arch, be equipped with the internal thread in the annular arch, 1 upper end periphery of cylinder body is located to 2 covers of cylinder cap, annular arch and 1 threaded connection of cylinder body, realize being connected with dismantling of cylinder body 1 and cylinder cap 2, and it is convenient to dismantle, the cover is equipped with the first sealed pad 3 of round between annular arch and the 1 upper end of cylinder body, the 1 outer wall of the inner wall contact cylinder body of first sealed pad 3, the protruding inner wall of the outer wall contact annular of first sealed pad 3, prevent that the water sample in the cylinder body 1 from flowing through the clearance between cylinder body 1.

A apopore has been seted up at 1 lower extreme middle part of cylinder body, and the position that the lower extreme of cylinder body 1 corresponds the apopore is equipped with a pipe 9, and the upper end and 1 fixed connection of cylinder body and the intercommunication of pipe 9, the lower extreme and the upper cover 6 of pipe 9 can be dismantled and be connected, and pipe 9 and the inside intercommunication of filter head to filter in letting in the water sample in the cylinder body 1 to the filter head through pipe 9, prevent the leakage of water sample.

1 lower extreme of cylinder body is equipped with a first solid fixed ring 11, the pipe 9 periphery is located to first solid fixed ring 11 cover, and the upper end of first solid fixed ring 11 is fixed at 1 lower extreme of cylinder body, the inner wall of first solid fixed ring 11 and the outer wall fixed connection of pipe 9, it is more firm to make 1 lower extreme of cylinder body and pipe 9 combine, still overlap on the pipe 9 and establish a sealed 12 of second, the sealed 11 lower extreme of first solid fixed ring of upper end contact of 12 of second, the sealed upper end of 12 of second contacts the upper end of upper cover 6, prevent that the water sample from leaking.

The filter head is cylindric, 6 lower extremes of upper cover are equipped with the mounting groove, it is used for providing a water storage space to go up the mounting groove, after the water sample enters into in the filter head promptly, temporary storage and filtration between last mounting groove and filter

core

8, 7 upper ends of lower cover are equipped with down the mounting groove, it all can communicate with each other with the external world with lower mounting groove to go up the mounting groove, be equipped with a plurality of through-holes on the upper cover 6, the through-hole is around the even setting of center pin circumference of upper cover 6, and the through-hole is close to 6 edges on the upper cover, be equipped with a plurality of screw holes on the lower cover 7, and a through-hole corresponds a screw hole, pass through-hole and screw hole in proper order through bolt 14 and connect upper cover 6 and lower cover 7, and 14 lower extreme and screw hole threaded connection of bolt, convenient connection and dismantlement, the connection effect is improved.

Still be equipped with the sealed pad 15 of third between upper cover 6 and the lower cover 7, the sealed pad 15 cover of third is located the 8 peripheries of filter core, and the sealed 8 outer walls of inner wall contact filter core of the sealed pad 15 of third, and the sealed upper end face contact upper cover 6 lower extreme of the sealed pad 15 of third, and the sealed lower end face contact lower cover 7 upper end of the sealed pad 15 of third prevents that the water sample from flowing from the clearance between upper cover 6 and the lower cover 7, influences the filter effect.

The lower end of the conduit 9 is provided with external threads, the upper end of the upper cover 6 is provided with an upper connecting hole 13, preferably, the middle part of the upper end of the upper cover 6 is provided with an upper bulge, the upper connecting hole 13 is arranged at the upper bulge, the upper connecting hole 13 is communicated with the upper mounting groove and the outside, the inner wall of the upper connecting hole 13 is provided with threads, the lower end of the conduit 9 extends into the upper connecting hole 13 and is in threaded connection with the upper connecting hole 13, and the detachable connection of the conduit 9 and the filter head is realized; lower extreme of lower cover 7 is equipped with lower connecting hole 16, it is more excellent, lower extreme middle part of lower cover 7 is equipped with arch once, lower connecting hole 16 is seted up in lower bellied department, mounting groove and external world under lower connecting hole 16 intercommunication, the inner wall of lower connecting hole 16 is equipped with the screw thread, the upper end of filter tip 10 is equipped with the external screw thread, and filter tip 10 upper end stretches into to connecting hole 16 down in, and with lower connecting hole 16 threaded connection, realize that filter tip 10 is connected with dismantling of filter tip, the lower extreme of filter tip 10 extends to the direction of keeping away from the filter tip, and filter tip 10 is used for stretching into to the sample bottle in, collect the water sample after filtering, so that carry out analysis and detection to the dissolved substance in the water sample.

Filter 10 periphery cover is equipped with the solid fixed ring of a second 17, the lower extreme at lower cover 7 is fixed to the upper end of the solid fixed ring of second 17, the outer wall at filter 10 is fixed to the inner wall of the solid fixed ring of second 17, come the filter 10 assistance-fixing through the solid fixed ring of second 17, prevent that filter 10 from breaking, still the cover is equipped with the sealed pad 18 of a fourth on the filter 10, the outer wall of the sealed pad 18's of fourth inner wall contact filter 10, the lower terminal surface of the sealed pad 18 of fourth up contacts the lower terminal surface of lower cover 7, the lower terminal surface contact solid fixed ring of second 17 of the sealed pad 18 of fourth, thereby seal filter 10 and lower cover 7 department, prevent that the water sample from revealing, influence collection efficiency.

The filter element 8 comprises a filter membrane and a support plate, a plurality of filter holes are formed in the support plate, the filter membrane is used for filtering a water sample, the water sample can be guaranteed to be in full contact with the filter membrane by the aid of the upper mounting groove, the filter holes can guarantee that the support plate can support the filter membrane, the water sample can not be influenced to pass through, and the support plate is an organic glass plate.

As a specific example, the utility model provides a field water sample filter equipment's specific parameter as follows:

the outer diameter of the cylinder body 1 is 210mm, the inner diameter is 200mm, and the height is 300 mm; the air tap 5 is a standard American valve core; the pressure gauge 4 is a stainless steel pressure gauge 4, and the measuring range is 0-1.6 MPa; the first sealing gasket 3 is an annular rubber gasket, the outer diameter is 210mm, the inner diameter is 200mm, and the thickness is 2 mm; the outer diameter of the first fixing ring 11 is 40mm, the inner diameter of the first fixing ring is 20mm, and the height of the first fixing ring is 10 mm; the outer diameter of the conduit 9 is 20mm, the inner diameter is 10mm, and the length is 20 mm; the inner diameter of the upper connecting hole 13 is 20mm, the outer diameter of the second sealing gasket 12 is 40mm, the inner diameter is 20mm, and the thickness is 2 mm; the diameter of the upper cover 6 is 200mm, the thickness is 20mm, the number of the through holes is four, and the inner diameter is 10 mm; the diameter of the lower cover 7 is 200mm, the thickness is 20mm, the inner diameter of a threaded hole of the lower cover is 10mm, the diameter of the lower mounting groove is 140mm, and the edge of the lower mounting groove is 5mm high; the diameter of the filter element 8 is 140mm, the height is 5mm, the inner diameter of the filter hole is 2mm, and the diameter of the filter membrane is 150 mm; the outer diameter of the third sealing gasket 15 is 150mm, the inner diameter is 140mm, and the thickness is 2 mm; the inner diameter of the lower connecting hole 16 is 20mm, the outer diameter of the fourth sealing gasket 18 is 40mm, the inner diameter is 20mm, and the thickness is 2 mm; the filter tip 10 external diameter 20mm, internal diameter 10mm, second solid fixed ring 17 external diameter 40mm, internal diameter 20 mm.

The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present description should not be construed as a limitation of the present invention.

Claims

1. The utility model provides an open-air water sample filter equipment which characterized in that: including cylinder body, cylinder cap and filter, cylinder body upper end opening, just be used for holding in the cylinder body and treat the filtration water sample, cylinder cap demountable installation be in the upper end opening part of cylinder body, and can be right the upper end opening of cylinder body is sealed, be equipped with manometer and air cock on the cylinder cap, the manometer is used for detecting internal pressure of cylinder, the air cock be used for to fill gas and change in the cylinder body internal pressure, filter demountable installation be in the cylinder body lower extreme, and with the inside intercommunication of cylinder body, the filter includes upper cover, filter core and lower cover, filter core demountable installation be in the upper cover with between the lower cover, the filter core is used for filtering the suspended solid in the water sample, the filter tip is installed to the filter tip lower extreme, the filter tip with the filter tip intercommunication, just the filter tip is used for discharging the water sample after filtering.

2. A field water sample filtering device according to claim 1, wherein: the cylinder body is cylindric, the cylinder cap is circular, just the cylinder body with the cylinder cap is transparent organic glass and makes.

3. A field water sample filtering device according to claim 2, wherein: the cylinder body upper end is equipped with the external screw thread, the cylinder cap outer fringe is equipped with annular arch, be equipped with the internal thread in the annular arch, the cylinder cap cover is located cylinder body upper end periphery, annular arch with cylinder body threaded connection, just annular arch with the cover is equipped with the first sealed pad of round between the cylinder body upper end, the inner wall contact of first sealed pad the cylinder body outer wall, the outer wall contact of first sealed pad the protruding inner wall of annular.

4. A field water sample filtering device according to claim 1, wherein: a apopore has been seted up at cylinder body lower extreme middle part, the lower extreme of cylinder body corresponds the position of apopore is equipped with a pipe, the upper end of pipe with cylinder body fixed connection and intercommunication, the lower extreme of pipe with the connection can be dismantled to the upper cover, just the pipe with the inside intercommunication of filter head.

5. A field water sample filter device according to claim 4, wherein: the cylinder body lower extreme is equipped with a first solid fixed ring, first solid fixed ring cover is located the pipe periphery, just first solid fixed ring's upper end is fixed the cylinder body lower extreme, first solid fixed ring's inner wall with the outer wall fixed connection of pipe, it is sealed to establish a second on the pipe still to overlap, the sealed upper end contact of pad of second first solid fixed ring lower extreme, the sealed lower extreme contact of pad of second the upper end of upper cover.

6. A field water sample filter device according to claim 4, wherein: the filter head is cylindric, just the lower cover upper end is equipped with down the mounting groove, the mounting groove can communicate with each other with the external world down, on cover and be equipped with a plurality of through-holes, the through-hole centers on the center pin circumference of upper cover evenly sets up, just the through-hole is close to the upper cover edge, cover down and be equipped with a plurality of screw holes, and a through-hole corresponds a screw hole, pass in proper order through the bolt the through-hole with the screw hole is connected the upper cover with the lower cover, just the bolt lower extreme with screw hole threaded connection, the filter core can imbed in the lower mounting groove.

7. A field water sample filter device according to claim 6, wherein: the upper cover with still be equipped with the sealed pad of third between the lower cover, the sealed pad cover of third is located the filter core periphery, just the sealed inner wall contact of pad of third the filter core outer wall, the sealed up end contact of third the upper cover lower extreme, the sealed lower end face contact of pad of third the lower cover upper end.

8. A field water sample filter device according to claim 6, wherein: the lower end of the guide pipe is provided with external threads, the upper end of the upper cover is provided with an upper connecting hole, the inner wall of the upper connecting hole is provided with threads, and the lower end of the guide pipe extends into the upper connecting hole and is in threaded connection with the upper connecting hole; the lower extreme of lower cover is equipped with down the connecting hole, lower connecting hole intercommunication lower mounting groove and external world, the inner wall of lower connecting hole is equipped with the screw thread, the upper end of filter tip is equipped with the external screw thread, just the filter tip upper end stretch into extremely in the lower connecting hole, and with lower connecting hole threaded connection, the lower extreme of filter tip is to keeping away from the direction of filter head extends.

9. A field water sample filter device according to claim 7, wherein: the filter tip periphery cover is equipped with the solid fixed ring of a second, the solid fixed ring's of second upper end is fixed the lower extreme of lower cover, the solid fixed ring's of second inner wall is fixed the outer wall of filter tip, it is sealed that still the cover is equipped with a fourth on the filter tip, the sealed inner wall contact of filling up of fourth the outer wall of filter tip, the sealed up end contact of filling up of fourth the lower terminal surface of lower cover, the sealed lower end surface contact of filling up of fourth the solid fixed ring's of second up end.

10. A field water sample filtering device according to claim 1, wherein: the filter core includes filter membrane and backup pad, be equipped with a plurality of filtration pores in the backup pad, the filter membrane is used for filtering the water sample, the backup pad is used for supporting the filter membrane, it is used for the water sample to pass through to filter the pore.