CN217331843U

CN217331843U - Water sample pretreatment and filtration device for automatic water quality monitoring station

Info

Publication number: CN217331843U
Application number: CN202220920795.8U
Authority: CN
Inventors: 沈洋洋; 朱建刚; 林方; 何飞
Original assignee: Hangzhou Ruili Marine Equipment Co ltd
Current assignee: Hangzhou Ruili Marine Equipment Co ltd
Priority date: 2022-04-20
Filing date: 2022-04-20
Publication date: 2022-08-30
Anticipated expiration: 2032-04-20

Abstract

The utility model discloses a quality of water automatic monitoring station water sample preliminary treatment filter equipment belongs to water quality monitoring field equipment. The device comprises a grit chamber, a bag type folding filter element and a sample cell; the water outlet of the grit chamber is communicated with the water inlet end of the bag-type folding filter element through a pipeline provided with a first water pump and a first three-way valve; the first three-way valve is also communicated with the grit chamber through a backwashing water drainage pipe; the water outlet end of the bag-type folding filter element is communicated with a sample cell through a pipeline provided with a second three-way valve, and the sample cell is communicated with the outside through a pipeline provided with a second drain valve; the second three-way valve is also connected with the water bucket through a pipeline provided with a second water pump. The system of the utility model has simple structure, occupies smaller space and is convenient to install; enough filtered water samples can be obtained in a short time, and the representativeness of the water samples is not influenced; the back washing effect of the filter element is good, frequent replacement is not needed, and the maintenance cost is saved.

Description

Water sample pretreatment and filtration device for automatic water quality monitoring station

Technical Field

The utility model belongs to water quality monitoring equipment field, concretely relates to quality of water automatic monitoring station water sample preliminary treatment filter equipment.

Background

In recent decades, along with the rapid development of national economy, a series of environmental pollution problems are brought. Among them, the problem of water pollution has become one of the important factors restricting the development of the economic society of China. With the enhancement of the environmental protection consciousness of the whole people, the national, local and even the whole people have stronger and stronger protection consciousness on water resources. Under the background, the water quality on-line monitoring industry of China has been developed rapidly in recent years, and national governments and local governments have invested a large amount of funds in succession to build automatic water quality monitoring stations in important areas such as rivers, lakes, reservoirs, estuaries and the like. The conventional monitoring indexes of the automatic water quality monitoring station comprise water temperature, conductivity, dissolved oxygen, pH, turbidity, chemical oxygen demand, total phosphorus, total nitrogen and ammonia nitrogen, and special monitoring indexes which can be added according to the water quality monitoring requirement comprise phosphate, nitrate, nitrite, heavy metal, organic matters and the like. The analysis method adopted by the online monitoring instrument for ammonia nitrogen, phosphate, nitrate, nitrite, heavy metal, partial organic matters and the like is generally a spectrophotometry, and the turbidity of water quality has great influence on the measurement methods, so that the water sample needs to be filtered and pretreated according to the requirements of relevant standards before entering the instrument for measurement.

At present, a common water quality automatic monitoring station integration manufacturer adopts a filtration pretreatment mode of a diaphragm pump and a sintered filter element, wherein the aperture of the sintered filter element is 0.45 mu m or 10 mu m, and the sintered filter element is provided with a compressed air back-flushing system. The sintered filter element with the diameter of 0.45 mu m has smaller filtering area, poor compressed air back flushing effect, easy blockage, short replacement period and high cost; the 10-micron sintered filter element can not meet the requirements on the pretreatment of a water sample, the turbidity can not be removed, and the influence on the measurement result of an instrument is great. And the sintered filter element is easy to corrode in a seawater environment with strong corrosiveness, and loses the filtering effect.

The cabinet type instrument integrated in the automatic water quality monitoring station generally has more demand on a water sample than a high-integration nutrient salt sensor, so that the development of the reliable and practical water sample pretreatment system of the automatic water quality monitoring station, which has the advantages of good filtering effect, large water yield, good backwashing effect and long filter element replacement period, is favorable for the accuracy and reliability of relevant index monitoring data of the water quality monitoring system, and the technical level of automatic water quality monitoring is improved.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the defects in the prior art and providing a water sample pretreatment and filtration device for a water quality automatic monitoring station. The device can be installed between a water sampling system of a water quality automatic monitoring station and a related analysis meter, water sample pretreatment is well carried out, and sufficient water samples are provided for the related analysis meter. Meanwhile, a special back-washing diaphragm pump is arranged to pump clean tap water to fully back wash the filter element, so that the continuous filtering effect of the filter element is ensured, and blockage is prevented.

The utility model discloses the concrete technical scheme who adopts as follows:

the utility model provides a water sample pretreatment filtering device of an automatic water quality monitoring station, which comprises a grit chamber, a bag type folding filter element and a sample chamber; the bottom of the grit chamber is communicated with the outside through a pipeline provided with a first drainage valve, and a water outlet is communicated with the water inlet end of the bag-type folding filter element through a pipeline provided with a first water pump and a first three-way valve; the first three-way valve is also communicated with the grit chamber through a backwashing water discharge pipe and is used for discharging the backwashing waste liquid of the bag type folding filter element into the grit chamber; the water outlet end of the bag-type folding filter element is communicated with a sample cell through a pipeline provided with a second three-way valve, and the sample cell is communicated with the outside through a pipeline provided with a second drain valve; the second three-way valve is also connected with the water bucket through a pipeline provided with a second water pump and used for carrying out back flushing on the bag type folding filter element.

Preferably, the first drain valve and the second drain valve are both electric ball valves.

Preferably, the first water pump and the second water pump are both diaphragm pumps.

Further, the first water pump and the second water pump are both one-way diaphragm pumps.

Preferably, the first three-way valve and the second three-way valve are both three-way solenoid valves.

Furthermore, the first three-way valve and the second three-way valve are both one-inlet two-outlet three-way electromagnetic valves.

Preferably, the shell of the bag-type folding filter element is made of polypropylene materials, the interior of the bag-type folding filter element is made of folding aluminum films, the pore diameter is 0.45 mu m, and the filter element is made of polypropylene fibers.

Preferably, the material of the grit chamber is stainless steel, and the inner surface layer and the outer surface layer are coated with anticorrosive paint layers.

Preferably, the bottom of the grit chamber is of a conical structure with a gradually reduced cross section.

Preferably, the sample cell is made of a corrosion-resistant material.

Compared with the prior art, the utility model, following beneficial effect has:

the device of the utility model has simple structure, small occupied space and convenient installation; enough filtered water samples can be obtained in a short time, and the representativeness of the water samples is not influenced; the filter element has good back washing effect, does not need to be frequently replaced, and saves the maintenance cost.

Drawings

Fig. 1 is a schematic diagram of the overall structure of the present invention;

in the figure: the device comprises a grit chamber 1, a first drain valve 2, a first water pump 3, a first three-way valve 4, a bag type folding filter element 5, a second three-way valve 6, a sample cell 7, a second drain valve 8, a second water pump 9, a water bucket 10 and a back flush drain pipe 11.

Detailed Description

The invention will be further elucidated and described with reference to the drawings and embodiments. The utility model discloses in the technical characteristics of each embodiment under the prerequisite that does not conflict each other, all can carry out corresponding combination.

As shown in figure 1, for the utility model provides a water sample pretreatment and filtration device of a water quality automatic monitoring station, the device mainly includes grit chamber 1, bag type folding filter element 5 and sample cell 7. The bottom of the grit chamber 1 adopts a tapered structure design with a gradually reduced cross section, so that large-particle impurities can be conveniently precipitated. The bottom of the grit chamber 1 is also provided with a water outlet which is communicated with the outside through a pipeline provided with a first drainage valve 2, so that redundant initial water samples and backwashing wastewater can be conveniently drained. When in actual use, the grit chamber 1 is used for storing an initial water sample and standing the water sample for half an hour to precipitate large particles such as silt in the initial water sample to the bottom of the grit chamber. The material of the grit chamber is stainless steel, and the inner surface layer and the outer surface layer are coated with a layer of anticorrosive paint, so that the cell body is prevented from rusting and the water quality of an original water sample is prevented from being influenced; the bottom of the grit chamber is designed to be conical, so that large particles can be conveniently precipitated; the first drainage valve 2 is installed to grit chamber lower part, conveniently drains unnecessary initial water sample in the grit chamber. The grit chamber is used for precipitating large particles in the initial water sample, and the precipitation time can be set according to the turbidity condition of the initial water sample.

The water outlet of the grit chamber 1 is connected with the water inlet of the first water pump 3 through a pipeline, and the water outlet of the first water pump 3 is connected with the inlet of the first three-way valve 4 through a pipeline. The first outlet of the first three-way valve 4 is communicated with the water inlet end of the bag-type folding filter element 5 through a pipeline, and the second outlet is communicated with the grit chamber 1 through a backwashing water discharge pipe 11 and is used for discharging the backwashing waste liquid of the bag-type folding filter element 5 into the grit chamber 1. In practical application, the first water pump 3 is used for pumping an upper-layer initial water sample in the grit chamber 1 and ensuring the filtering pressure of the initial water sample when the initial water sample passes through the bag-type folding filter element 5; the first three-way valve 4 is used for controlling the direction of water flow during filtration and backwashing.

The bag type folding filter element 5 is used for filtering an initial water sample, and the water outlet end of the bag type folding filter element is communicated with a sample pool 7 through a pipeline provided with a second three-way valve 6. The water inlet end of the second three-way valve 6 is communicated with the bag-type folding filter element 5 through a pipeline, the first outlet is communicated with the sample pool 7 through a pipeline, and the second outlet is connected with the water bucket 10 through a pipeline provided with a second water pump 9 and used for back flushing of the bag-type folding filter element 5. The sample tank 7 is communicated with the outside through a pipeline provided with a second drain valve 8, so that redundant filtered water samples are conveniently drained.

In practical applications, the first water pump 3 and the second water pump 9 are preferably small one-way diaphragm pumps. The pump body volume is less, and is little at the inside occupation space of monitoring station rack, easy to assemble. The flow of diaphragm pump is big, can guarantee that initial water sample has sufficient filtering pressure occasionally through the filter core, acquires sufficient filtration water sample in short time.

In this embodiment, the power supply voltage of the first water pump 3 and the second water pump 9 is 12V direct current, and the water body flows in a unidirectional manner. The first three-way valve 4 and the second three-way valve 6 are one-inlet two-outlet three-way electromagnetic valves, and the power supply voltage is direct current 12V. When the electromagnetic valve is not powered on, the first path of the water outlet port is opened, and the second path of the water outlet port is closed; when the electromagnetic valve is powered on, the first path of the water outlet port is closed, and the second path of the water outlet port is opened. The power supply voltage of the first drain valve 2 and the second drain valve 8 is 12V direct current, and when the electric ball valve is not powered on, the valves are closed; when the electric ball valve is powered on, the valve is opened.

The material of the filter membrane in the bag type folding filter element is polypropylene fiber, so that the strength is high, the filter membrane can bear higher pressure without being damaged, the filter membrane can be back-flushed, the physical and chemical properties are stable, and the dirt carrying capacity is large; the internal filter membrane is foldable, so that an ultra-large filtering area can be obtained in a small space, and more water samples can be filtered in a short time; the aperture of the filter element is 0.45 μm, and the filter membrane with the aperture of 0.45 μm can filter suspended particle impurities in a water sample and remove the turbidity of the water sample, but can not intercept soluble salt ions in the water sample and can not influence the representativeness of the water sample.

The water bucket can store enough tap water for backwashing the bag type folding filter element. The storage capacity of tap water can ensure that the automatic flushing can be carried out for more than one month.

The sample pool is made of a high-molecular material, is corrosion-resistant and does not influence the representativeness of a water sample; enough filtered water samples can be stored for measurement of ammonia nitrogen, heavy metals and other related analyzers.

The working principle of the device is as follows:

after a water sample is collected into the grit chamber 1 by the automatic water quality monitoring station, standing and precipitating for 30min to precipitate large-particle impurities in the initial water sample to the bottom of the grit chamber; and then keeping the first drain valve 2, the first three-way valve 4, the second three-way valve 6 and the second water pump 9 in a non-powered state, powering on the first water pump 3 and the second drain valve 8, filtering the initial water sample through the bag-type folding filter element 5, discharging the residual water sample in the original bag-type folding filter element 5 out of the filter element, continuously powering on the second drain valve 8 for 15s, powering off the second drain valve 8 after discharging the residual water sample, closing the valve, storing the filtered water sample in the sample pool 7, powering on the first water pump 3 for 1min, enabling the filtered water sample in the sample pool 7 to reach a high liquid level, and powering off the first water pump 3. The filtered water sample in the sample pool is measured by an analyzer for ammonia nitrogen, heavy metals and the like; after the measurement is finished, keeping the first water pump 3 and the second drain valve 8 in a non-power-on state, powering the first drain valve 2, the first three-way valve 4 and the second three-way valve 6 for 5s, draining residual initial water samples in the grit chamber 1, and communicating back-flushing pipelines; keeping the power-on states of the first drain valve 2, the first three-way valve 4 and the second three-way valve 6, then powering on the second water pump 9 for 1.5min, backwashing the bag-type folding filter element 5 by using tap water in the water bucket 10, discharging backwashing waste liquid into the grit chamber 1 through the backwashing drain pipe 11, and then directly discharging the backwashing waste liquid, thus finishing the backwashing. And powering off the second water pump 9, and powering off the first drain valve 2, the first three-way valve 4 and the second three-way valve 6 after 5 s.

The system of the utility model has simple structure, occupies smaller space and is convenient to install; enough filtered water samples can be obtained in a short time, and the representativeness of the water samples is not influenced; the filter element has good back washing effect, does not need to be frequently replaced, and saves the maintenance cost.

The above-mentioned embodiments are merely a preferred embodiment of the present invention, but it is not intended to limit the present invention. Various changes and modifications can be made by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present invention. Therefore, all the technical schemes obtained by adopting the mode of equivalent replacement or equivalent transformation fall within the protection scope of the utility model.

Claims

1. A water sample pretreatment filtering device of an automatic water quality monitoring station is characterized by comprising a grit chamber (1), a bag-type folding filter element (5) and a sample tank (7); the bottom of the grit chamber (1) is communicated with the outside through a pipeline provided with a first drainage valve (2), and a water outlet is communicated with the water inlet end of the bag-type folding filter element (5) through a pipeline provided with a first water pump (3) and a first three-way valve (4); the first three-way valve (4) is also communicated with the grit chamber (1) through a backwashing water discharge pipe (11) and is used for discharging backwashing waste liquid of the bag type folding filter element (5) into the grit chamber (1); the water outlet end of the bag type folding filter element (5) is communicated with a sample cell (7) through a pipeline provided with a second three-way valve (6), and the sample cell (7) is communicated with the outside through a pipeline provided with a second drain valve (8); the second three-way valve (6) is also connected with a bucket (10) through a pipeline provided with a second water pump (9) and is used for carrying out back flushing on the bag type folding filter element (5).

2. The water sample pretreatment filtering device of the automatic water quality monitoring station as claimed in claim 1, wherein the first drain valve (2) and the second drain valve (8) are both electric ball valves.

3. The water sample pretreatment filtering device of the automatic water quality monitoring station as claimed in claim 1, wherein the first water pump (3) and the second water pump (9) are both diaphragm pumps.

4. The water sample pretreatment filtering device of the automatic water quality monitoring station as claimed in claim 3, wherein the first water pump (3) and the second water pump (9) are both one-way diaphragm pumps.

5. The water sample pretreatment filtering device of the automatic water quality monitoring station as claimed in claim 1, wherein the first three-way valve (4) and the second three-way valve (6) are both three-way solenoid valves.

6. The water sample pretreatment filtering device of the automatic water quality monitoring station as claimed in claim 5, wherein the first three-way valve (4) and the second three-way valve (6) are both one-inlet and two-outlet three-way solenoid valves.

7. The water sample pretreatment filtering device of the automatic water quality monitoring station as claimed in claim 1, wherein the outer shell of the bag type folding filter element (5) is made of polypropylene material, the inner part of the bag type folding filter element is made of folding aluminum film, the pore diameter is 0.45 μm, and the filter element material is polypropylene fiber.

8. The water sample pretreatment filtering device of the automatic water quality monitoring station as claimed in claim 1, wherein the grit chamber (1) is made of stainless steel, and the inner and outer surface layers are coated with anti-corrosion paint layers.

9. The water sample pretreatment filtering device of the automatic water quality monitoring station as claimed in claim 1, wherein the bottom of the grit chamber (1) is of a tapered structure with a gradually reduced cross section.

10. The water sample pretreatment filtering device of the automatic water quality monitoring station according to claim 1, wherein the sample tank (7) is made of corrosion-resistant materials.