CN102716613A - Micro-irrigation full-automatic back-wash sand filter - Google Patents

Abstract

A micro-irrigation automatic backwashing sand filter, which is to install two sand filter tanks in parallel on a pair of brackets, and two filter cartridges are arranged longitudinally and parallel in the filter tanks, and the other end of each filter cartridge is There is a water outlet leading out of the tank respectively, a stop valve and a pressure gauge are respectively installed on the pipes of each water outlet, a handle is respectively installed on the filter element at one end of each flange cover, and horizontally in the middle of the filter tank. A clapboard is installed, and a water inlet and a sand filling port are led upwards on the top of the filter tank on both sides of the clapboard, and a backwash control valve is installed with a branch pipe at each water inlet, and the branch pipes of each backwash control valve The other ends are respectively connected in parallel to the water inlet pipes, each backwash control valve is respectively connected to the water inlet with a water supply pipe, and the upper end of each backwash control valve is respectively connected to a sewage pipe, and on the sewage pipe and the water inlet pipe. A shut-off valve is respectively provided, and two sand discharge ports are respectively provided on the bottom side of each filter tank.

Description

A micro-irrigation fully automatic backwash sand filter

Technical field:

The invention relates to watering, in particular to a micro-irrigation automatic backwashing sand filter with high degree of automation, good backwashing effect, large flow rate and convenient maintenance.

Background technique:

As an advanced watering technology, micro-irrigation has the advantages of saving water and energy. However, due to the small diameter of the flow path of the emitter, the key equipment of micro-irrigation, it is easy to be blocked by impurities in the water, resulting in uneven water distribution and poor system performance. decline, or even paralyze the entire system. Sand filter is a relatively widely used micro-irrigation filter at present, which has the advantages of strong impurity removal ability, good filtering effect, energy saving and water saving. However, there are still disadvantages such as poor backwashing automation, small water flow, and inconvenient maintenance.

Invention content:

The object of the present invention is to provide a micro-irrigation automatic backwashing sand filter with good backwashing automation, large water flow, convenient maintenance, energy saving and water saving.

The technical solution of the present invention is accomplished in the following manner, it includes a sand filter tank, which is characterized in that: two sand filter tanks are respectively installed in parallel on a pair of brackets, and two sand filter tanks are arranged longitudinally in parallel in each sand filter tank. Each filter cartridge is equipped with a filter element respectively, and a flange cover is provided protruding from the tank at one end of each filter cartridge, and a water outlet is drawn out of the tank at the other end of each filter cartridge, and each A shut-off valve and a pressure gauge are respectively installed on the pipeline of the water outlet, a handle is respectively installed in the filter cartridge on the filter element at one end of each flange cover, and a partition is installed horizontally in the middle of the filter tank, and a separator is installed in the middle of the filter tank. The top of the filter tank on both sides of the plate leads upwards to have a water inlet and a sand filling port respectively, and a water diffuser with an enlarged diameter is installed in each water inlet, and a backwash control valve is installed with a branch pipe at each water inlet. The other ends of the branch pipes of the backwash control valves are respectively connected in parallel to a water inlet pipe, and each backwash control valve is respectively connected with a water supply pipe to the water inlet, and the upper end of each backwash control valve is respectively connected to a sewage discharge pipe A shut-off valve is respectively provided on the sewage discharge pipe and the water inlet pipe, and a sand discharge port is respectively provided on the bottom surface of both sides of the partition of each filter tank. The tank body of the present invention is provided with double water passage chambers and double filter elements for filtering, so the water flow rate is large and the efficiency is high. normal operation of the entire system.

Description of drawings:

Fig. 1 is a schematic view of the overall structure of the present invention; Fig. 2 is a schematic sectional view of a filter tank of the present invention.

Detailed ways:

An embodiment is described in detail in conjunction with the above accompanying drawings. The present invention uses two sand filter tanks 7 to be installed in parallel on a pair of supports 17 respectively, and two filter cartridges 12 are vertically and parallelly arranged in each sand filter tank, A filter element 11 is respectively installed in the cylinder, and a flange cover 9 is installed protruding from the tank body at the left end of each filter cylinder, and a water outlet 16 is drawn out of the tank at the right end of each filter cylinder, and a water outlet 16 is drawn out of the tank at the left end of each filter cylinder. A shut-off valve 3 and a pressure gauge 2 are respectively installed on the pipeline, a handle 10 is installed in the filter cartridge on the filter element at one end of each flange cover, and a partition 13 is installed horizontally in the middle of the filter tank. A water inlet 8 and a sand filling port 5 are led upwards from the top of the filter tank on both sides of the partition, and a water diffuser 14 with an enlarged diameter is respectively provided in each water inlet, and a backwash is installed with a branch pipe at each water inlet. Control valve 1, the other ends of the branch pipes of each backwash control valve are respectively connected in parallel to a water inlet pipe 18, and each backwash control valve is respectively connected with a water supply pipe to the water inlet, and the upper ends of each backwash control valve are respectively connected to On a blowdown pipe 4, shut-off valves 3 are respectively arranged on the water inlet pipes of the blowdown pipe, and a sand outlet 6 is respectively arranged on the bottom surfaces of both sides of the partitions of each filtering tank. The tank body of the present invention is provided with double water passage chambers and double filter cores for filtering, which increases the water flow rate and improves the work efficiency. The gravel 15 in the water cavity is backwashed and discharged, reducing labor intensity and improving service life.

Its working principle is: when it is in the normal filtering working state, the water inlet and outlet in the same direction on each backwash control valve are connected, the internal valve plate closes the backwash sewage outlet in the vertical direction, and the undisturbed water flows from the main water inlet pipe through the control valve and the tank. Each water inlet enters the tank, and the water is evenly distributed to the surface of the sand filter bed where the quartz sand particles are accumulated through the water diffuser. When the water flows through the porous medium of the quartz sand filter bed, some solid impurities and suspended particles are trapped in the filter material. In the pores between the particles, the water after flowing through the filter layer enters the filter element through the pores of the filter cartridge, and is collected to supply the irrigation system through the water outlet. In the present invention, each filter tank is provided with two water inlets, and a partition is set inside the tank body to form two water passage chambers. In the double tank combination mode, it is equivalent to a set of filters with four water passage chambers. At the same time, the structural form of double filter cartridges is designed, thereby increasing the filtration flow rate of the tank. The backwashing process means that after a certain period of filtering operation, the dirt retained by the filter material gradually blocks the pores between the filter material particles. At this time, it is often necessary to use reverse water flow to clean the dirt in the filter bed. When the backwash mode starts, the valve plate of the backwash control valve upstream of the filter tank to be washed moves up to close the water inlet, and connects the water outlet and the sewage outlet, so that the water flow carrying the dirt flows from the upper end of the tank in a reverse way. It flows into the water outlet of the backwash control valve, and then enters the sewage pipe through the sewage outlet. The backwashing process is to impact the filter material with pressurized water from the bottom of the filter layer through the filter cartridge, so that the filter material particles expand and surge up. Under the friction and collision with each other, the impurities and particles attached to the surface of the filter material are separated, and enter the sewage pipe with the upstream water flow. It contains complex fluids such as the hydraulic movement of sand filter material particles, the separation and movement of different impurities and filter materials, etc. mechanics process. When in filtering mode, the four water chambers work simultaneously: when one water chamber enters the backwash state, the other water chambers can still continue to operate, and the backwash water is used to pass through the water chamber from the tank in the filtering state The filtered clean water cleans the water chambers of the filter tank one by one, that is, when one water chamber is backwashed, the other three water chambers continue to maintain the filtering state. to the filtering state, and then clean the other three water chambers one by one, and rinse in a sequential cycle, and all of them are rinsed once, which is a flushing cycle.

Claims (1)

1. A micro-irrigation full-automatic backwashing sand filter, which includes a sand filter tank, is characterized in that: two sand filter tanks are respectively installed in parallel on a pair of supports, and are vertically and parallelly arranged in each sand filter tank respectively There are two filter cartridges, each filter cartridge is equipped with a filter element, a flange cover is provided at one end of each filter cartridge protruding from the tank, and a water outlet is drawn out of the tank at the other end of each filter cartridge, A shut-off valve and a pressure gauge are installed on the pipes of each water outlet, a handle is installed in the filter cartridge on the filter element at one end of each flange cover, and a partition is installed horizontally in the middle of the filter tank. On the top of the filter tank on both sides of the partition, there are respectively a water inlet and a sand filling port. Each water inlet is equipped with a water diffuser with an enlarged diameter, and a backwash control valve is installed at each water inlet with a branch pipe. , the other ends of the branch pipes of each backwash control valve are respectively connected in parallel to a water inlet pipe, and each backwash control valve is respectively connected with a water supply pipe to the water inlet, and the upper ends of each backwash control valve are respectively connected to a sewage discharge pipe. On the pipe, a shut-off valve is arranged on the sewage pipe and the water inlet pipe, and a sand discharge port is respectively arranged on the bottom surface of both sides of the partition of each filtering tank.

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