Filter layer cleaning system for sand filter

Abstract

The utility model discloses a filter layer cleaning system for a sand filter, which comprises a plurality of sand filter devices arranged in parallel, an inlet of each sand filter device is respectively communicated with a raw water pipeline through a water inlet pipeline, and an outlet of each sand filter device is respectively communicated with a clean water tank through a water outlet pipeline. The other end of the water inlet pipeline is communicated with the cleaning water collecting tank through a cleaning pipeline; a three-way valve is mounted on each water inlet pipeline, an automatic control system automatically adjusts the two-position three-way valve to be communicated with a raw water inlet level, so that raw water enters the sand filtering devices and a cleaning water outlet level is blocked, and produced water of the other sand filtering devices is used for cleaning a sand layer of the 1 # sand filtering device; after cleaning is finished, the water production electric valve is opened, and the two-position three-way valve is adjusted to a raw water inlet level state to enter a filtering water production mode. According to the utility model, the two-position three-way valve is arranged, so that the mounting quantity of valves is reduced, the pipeline is convenient to mount and clean, and the investment cost and the operation cost of the sand filtering device are reduced.

Description

Technical Field

[0001] The utility model relates to a sand layer cleaning system, in particular to a filter layer cleaning system for a sand filter. Background Art

[0002] The sand filter device adopts a medium filtration process. During the water production operation, raw water runoff enters the sand filter from the upper end, and after being evenly distributed by the water distributor, it flows from the upper end to the lower end of the filter layer. After the raw water is filtered by the filter layer, it passes through the sand separation plate or the water cap and separates from the filter layer, and clean water runoff is formed at the lower end of the sand filter. During the water production operation, the filter media layer continuously intercepts suspended solids and colloids, which aggravates the pollution of the filter layer, and the pressure loss of the filter layer continuously increases on the basis of the pressure loss of the clean filter media. When the filter layer differential pressure is too high and the filter layer mud film ruptures, the water production quality deteriorates. When the working pressure of the sand filter device in the constant flow state rises to a certain level, the operation is stopped and the sand layer is cleaned. Currently, the existing sand layer cleaning methods for sand filter devices all use a large-flow water pump to pump clear water from the clear water tank to clean the sand layer.

[0003] Schematic diagram of the plane pipeline system of a conventional sand filter device (see Figure 1 ) shows that the pipeline system of this system requires 20 electric valves and 16 manual valves, and the pipeline is complex. In addition to the raw water pump, the electric contact pressure gauge, and the pressure gauge, the entire automatic control system also needs to control 16 electric valves and a cleaning water pump.

[0004] As Figure 1 shown: This system needs to set up a dedicated cleaning water pump to wash the sand layer. The manual valves need to be opened during both the filtration and cleaning stages and only closed during maintenance. During the filtration and water production process, the automatic control system automatically opens all the raw water inlet and outlet electric valves and closes the cleaning inlet and outlet electric valves to operate the system normally. When the working pressure of the sand filter device in the constant flow state rises to a certain level, the operation is stopped and the sand layer is cleaned. Taking the No. 1 sand filter device as an example, when the working pressure of the No. 1 sand filter device in the constant flow state rises to a certain level, keeping the existing positions of the electric valves of other sand filter devices unchanged, close the raw water inlet No. 1 electric valve and the raw water outlet No. 1 electric valve, open the cleaning inlet No. 1 electric valve and the cleaning outlet No. 1 electric valve, clean for 5 - 8 minutes, after the cleaning is completed, turn off the cleaning water pump, close the cleaning inlet and outlet No. 1 electric valves, open the raw water inlet and outlet No. 1 electric valves, and enter the filtration and water production mode. The remaining sand filter devices are cleaned in sequence.

[0005] In summary, for the existing conventional sand filters, during use, not only are multiple valves required to be installed, making the pipeline complex, but also a cleaning water pump is needed to clean the sand filter, which increases the use cost. Content of the Utility Model

[0006] In order to solve the deficiencies of the above-mentioned technologies, the utility model provides a filter layer cleaning system for a sand filter.

[0007] To solve the above technical problems, the technical solution adopted by the present utility model is as follows: A filter layer cleaning system for a sand filter, the system includes a plurality of sand filters arranged in parallel, the inlets of each sand filter are respectively connected to the raw water pipeline through the water inlet pipeline, and the outlets are respectively connected to the clear water tank through the water outlet pipeline. The other end of the water inlet pipeline is connected to the cleaning water collection tank through the cleaning pipeline;

[0008] Two-position three-way valves are installed on the water inlet pipelines, and water inlet manual valves are installed on the water inlet pipelines. The two-position three-way valves are respectively connected to the pipelines where the sand filters are located and the cleaning pipelines; Water production manual valves are installed on the water outlet pipelines, and the water production electric valve on the clear water tank is connected to the pipelines where the sand filters are located; The cleaning water generated by the sand filters enters the cleaning water collection tank through the cleaning pipeline.

[0009] Preferably, a raw water lift pump is installed on the raw water pipeline, and an inlet manual valve and an outlet manual valve are respectively installed on both sides of the raw water lift pump.

[0010] Preferably, the two-position three-way valve is an electric two-position three-way valve, which is respectively connected to the water inlet pipeline, the sand filter, and the cleaning pipeline.

[0011] Preferably, a cleaning water outlet manual valve is installed on the cleaning pipeline.

[0012] By setting the two-position three-way valve, the present utility model not only reduces the number of valve installations, facilitates pipeline installation, but also is convenient for cleaning, reducing the investment cost and operation cost of the sand filter device. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of a sand filter system in the prior art.

[0014] Figure 2 It is a schematic diagram of the overall structure of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] Next, the technical solutions in the embodiments will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0016] The present utility model will be further described in detail below in conjunction with the drawings and specific embodiments.

[0017] As Figure 2A filter layer cleaning system for a sand filter is shown. The system includes a plurality of sand filter devices (sand filters) arranged in parallel. The inlets of each sand filter device are respectively connected to the raw water pipeline through the inlet pipeline, and the outlets are respectively connected to the clear water tank through the outlet pipeline. The other end of the inlet pipeline is connected to the cleaning water collection tank through the cleaning pipeline;

[0018] Multiple devices are often operated in parallel for the sand filter device. The sand layer cleaning system of this solution operates under the condition of 4 sand filter devices in parallel. If there are multiple sand filter devices, they can be grouped according to the number of sand filter devices to form a sand layer cleaning system. The number of configured sand filter devices in the sand layer cleaning system can be 3 / 4 / 5 units.

[0019] Two-position three-way valves are installed on all inlet pipelines. When the inlet manual valve on the inlet pipeline is opened, the pipeline connecting the two-position three-way valve to the sand filter device is opened, and the pipeline connected to the cleaning pipeline is closed. The produced water manual valve on the outlet pipeline is opened, and the produced water electric valve on the clear water tank is opened. At this time, each sand filter device produces water normally;

[0020] Close the inlet manual valve on the inlet pipeline of any one sand filter device. Close the pipeline connecting the two-position three-way valve to the sand filter device and open the pipeline connected to the cleaning pipeline. Open the produced water manual valve on the outlet pipeline and close the produced water electric valve on the clear water tank. The other sand filter devices produce water normally. At this time, the produced water generated by the other sand filter devices enters this sand filter device for backwashing, and the generated cleaning water enters the cleaning water collection tank through the cleaning pipeline to complete the backwashing.

[0021] Preferably, a raw water lift pump is installed on the raw water pipeline, and an inlet manual valve and an outlet manual valve are respectively installed on both sides of the raw water lift pump.

[0022] Among them, the two-position three-way valve is an electric two-position three-way valve, which is respectively connected to the inlet pipeline, the sand filter device, and the cleaning pipeline. By setting the electric two-position three-way valve, the installation of a large number of valves is omitted, the installation of the sand layer cleaning water pump can be omitted, the number of automatic control electric valves is reduced, and the number of points required for the automatic control system is small, thus greatly reducing the investment and operation costs of the sand filter device.

[0023] During normal water production, the raw water in the raw water pipeline enters each sand filter device through the inlet pipeline respectively, and the produced water enters the cleaning tank through the outlet pipeline respectively. At this time, all manual valves are in the open state.

[0024] During backwashing, the sand filter device to be cleaned stops producing water, and the other sand filter devices produce water normally and the produced water flushes the sand filter device to be cleaned. The generated cleaning water enters the cleaning water collection tank through the cleaning pipeline. By using other sand filter devices to backwash one of the sand filter devices, the installation of the cleaning water pump is omitted, the pipeline installation is simplified, and the cost is saved at the same time.

[0025] Furthermore, a manual inlet valve is installed on the inlet pipeline, a manual cleaning water outlet valve is installed on the cleaning pipeline, and a manual product water valve is installed on the outlet pipeline. A product water electric valve is installed on the clear water tank.

[0026] During normal water production, the product water of each sand filtration device enters the clear water tank through the outlet pipeline. When it is necessary to clean a certain sand filtration device, the product water electric valve is closed. At this time, the product water of the sand filtration devices with normal water production cannot be discharged into the clear water tank. Moreover, the outlet pipelines of each sand filtration device are interconnected. Therefore, when the product water electric valve is closed, the manual inlet valve of the sand filtration device to be cleaned and the pipeline connecting the two-way three-way valve to this sand filtration device are closed simultaneously. At this time, the product water generated by other sand filtration devices will enter the sand filtration device to be cleaned through the outlet pipeline, thus realizing the cleaning of the sand filtration device.

[0027] As Figure 2 shown, the sand layer cleaning system of this solution requires 1 product water electric valve, 4 two-way three-way electric valves, and 14 manual valves, and the pipeline is simple. In addition to the original water pump and the electric contact pressure gauge, the entire automatic control system only needs to control 5 electric valves.

[0028] As Figure 2 shown: The sand layer cleaning system of this solution does not need to set up a dedicated cleaning water pump and performs self-cleaning through the two-way three-way valve control system. The two positions of the two-way three-way valve are the original water inlet position and the cleaning water outlet position respectively. The manual valves for the product water and cleaning processes need to be opened, and are only closed during maintenance. During the product water process, the automatic control system automatically adjusts the two-way three-way valve to connect to the original water inlet position, allowing the original water to enter the sand filtration device and blocking the cleaning water outlet position, and the product water process operates normally. When the working pressure of the sand filtration device under a constant flow state rises to a certain level, the operation is stopped and the sand layer is cleaned, entering the cleaning process.

[0029] Taking the No. 1 sand filtration device as an example, when the working pressure of the No. 1 sand filtration device under a constant flow state rises to a certain level, the automatic control system will automatically close the product water electric valve and adjust the two-way three-way valve to the cleaning water outlet position and block the original water inlet position, preventing the original water from entering the No. 1 sand filtration device and allowing the sewage for cleaning the sand layer to flow into the cleaning water collection tank. The rest of the sand filtration devices maintain the filtration process, and the product water of the rest of the sand filtration devices is used to clean the sand layer of the No. 1 sand filtration device. After cleaning for 5 - 8 minutes, the product water electric valve is opened and the two-way three-way valve is adjusted to the original water inlet position state to enter the filtration and product water mode. The rest of the sand filtration devices are cleaned in sequence through the above process.

[0030] The purpose of the present utility model is to provide a filter layer cleaning system for a sand filter. By adopting this solution, it is not necessary to set up a dedicated clean water pump, the control points of the automatic control system are greatly reduced, the installation and maintenance of the pipeline system are simple and convenient, thereby reducing the investment cost and operation and maintenance cost of the entire system.

[0031] The above embodiments are not a limitation to the present utility model, nor is the present utility model limited to the above examples. Any changes, modifications, additions or substitutions made by those skilled in the art within the technical scope of the present utility model also fall within the protection scope of the present utility model.

Claims

1. A filter layer cleaning system for a sand filter, characterized in that: The system comprises a plurality of sand filters arranged in parallel, the inlet of each sand filter is connected to the raw water pipeline through a water inlet pipeline, the outlet is connected to the clean water tank through a water outlet pipeline, and the other end of the water inlet pipeline is connected to the cleaning water collection tank through a cleaning pipeline; The water inlet pipeline is installed with a two-position three-way valve, and a water inlet manual valve is installed on the water inlet pipeline. The two-position three-way valve is respectively connected to the pipeline where the sand filter is located and the cleaning pipeline; a water production manual valve is installed on the water outlet pipeline, and the water production electric valve on the clear water tank is connected to the pipeline where the sand filter is located; the cleaning water generated by the sand filter enters the cleaning water collection tank through the cleaning pipeline.

2. The filter layer cleaning system for sand filter according to claim 1, characterized in that: A raw water lifting pump is installed on the raw water pipeline, and an inlet manual valve and an outlet manual valve are respectively installed on both sides of the raw water lifting pump.

3. The filter layer cleaning system for sand filter according to claim 1, characterized in that: The two-position three-way valve is an electric two-position three-way valve, which is respectively connected with the water inlet pipeline, the sand filter, and the cleaning pipeline.

4. The filter layer cleaning system for a sand filter according to claim 1, characterized in that: A manual valve for washing water outlet is installed on the washing pipeline.

Images