Device for preventing air from entering filter material layer of filter tank

Abstract

The utility model provides a device for preventing air from entering a filter material layer of a filter tank to form negative water pressure, which belongs to the technical field of water treatment and can keep the liquid level of the filter tank constant and ensure the stable quality of effluent of the filter tank. The device body is composed of an exhaust port, a constant liquid level pipe, an overflow pipe, a water inlet pipe and a water outlet pipe, the water inlet pipe is communicated with the constant liquid level pipe, and the water outlet pipe is communicated with the overflow pipe. The device is simple in structure, convenient to install, stable and reliable in use effect and low in cost, can replace a liquid level meter and an electric valve to control the liquid level of the filter tank, avoids complex electric appliance control logic, and avoids negative effects such as unstable effluent quality caused by electric appliance faults.

Description

Technical Field

[0001] The utility model relates to a device for preventing air from entering into a filter material layer of a filter pool. Background Art

[0002] The most common phenomenon in the operation of the filter is that air enters the filter layer during filtration, causing excessive loss of filtered water, shortening the filtration cycle, leading to backwash filter loss and deterioration of water quality. When the filter is running, there is a certain water level inside the filter, and there is a certain hydrostatic pressure in the filter layer. The head loss during filtration increases with the increase of the depth of the filter layer. Due to the insufficient water depth in the upper part of the filter layer, the head loss may be greater than the hydrostatic pressure in the middle and lower layers of the filter layer. The negative pressure caused by the negative pressure, which causes the gas dissolved in the water under normal pressure to be released and attached to the filter particles to form bubbles. Under the impact of the filtered water, the bubbles are located at the bottom of the filter particles, and the filter layer produces air resistance. Especially in the middle and late stages of the filter operation cycle, there are many interceptions in the filter layer, and the resistance increases, causing head loss. When the water level in the filter is too low, the static pressure of the water in the filter layer is small and negative water pressure is easily generated. Therefore, there is an urgent need for a device that can solve the existing problem of preventing air from entering the filter layer of the filter. Summary of the invention

[0003] The utility model aims at the above-mentioned problems existing in the prior art, and provides a device for preventing air from entering the filter material layer of the filter tank. The filter tank has a constant liquid level height through a constant liquid level pipe, so that the excessively high waterfall carries air into the filter material layer, and the phenomenon of negative water pressure caused by insufficient water level is avoided. The device has a simple structure, is easy to install, has a stable and reliable use effect, and is low in cost. The utility model designs a device for preventing air from entering the filter material layer of the filter tank, including a constant liquid level pipe, which is characterized in that the upper and lower ends of the constant liquid level pipe are both sealed by blind plate welding, an overflow pipe is placed in the constant liquid level pipe, the bottom of the overflow pipe is fixed on the blind plate at the bottom end of the constant liquid level pipe, and two through holes are opened in the lower part of the constant liquid level pipe, one through hole is connected to a flange connected to the water outlet pipe of the filter tank, and the other through hole is provided with a water outlet pipe and is closed and connected to the through hole, and the top of the water outlet pipe is closed and connected to the water outlet opened on the overflow pipe. The blind plate on the top of the constant liquid level pipe is provided with an air hole, and the air hole is connected to a vent valve. The utility model has the advantages of controlling the filter tank to maintain a constant liquid level through the constant liquid level pipe, avoiding exposure of the filter material layer, and preventing excessive water drop when the filtered water enters the filter tank through the water channel. When the filter tank is put into production after backwashing, the water level in the filter tank is controlled by the constant liquid level pipe to prevent the release of dissolved gas in the filter material layer to produce gas resistance, ensure a certain height of water level in the filter tank, and ensure sufficient hydrostatic pressure in the filter material layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0004] Figure 1 It is a structural schematic diagram of the utility model.

[0005] Figure 2This is a use example of the utility model. DETAILED DESCRIPTION

[0006] The following describes the specific implementation of the utility model in detail in conjunction with the accompanying drawings so that those skilled in the art can more clearly understand how to practice the utility model. Although the utility model is described in conjunction with its preferred specific embodiments, these embodiments are only illustrative, rather than limiting the scope of the utility model.

[0007] The figure shows a device for preventing air from entering the filter material layer of the filter tank, comprising a constant liquid level pipe 2, characterized in that both upper and lower ends of the constant liquid level pipe are welded and sealed with blind plates 6, an overflow pipe 3 is placed inside the constant liquid level pipe, the bottom of the overflow pipe is fixed on the blind plate at the bottom of the constant liquid level pipe, two through holes are opened at the lower part of the constant liquid level pipe, one through hole 4 is connected with a flange connected to the water outlet pipe of the filter tank, the other through hole 5 is provided with a water outlet pipe 7 which is sealed and connected to the through hole 5, and the top of the water outlet pipe 7 is sealed and connected to the water outlet 8 opened on the overflow pipe. The top of the constant liquid level pipe is provided with an air hole 9 on the blind plate, and the air hole is connected to the vent valve 1.

[0008] When the filtered water from the filter tank enters the constant liquid level device through the water inlet flange, it enters the overflow pipe of the constant liquid level device as the liquid level continues to rise, ensuring that there is a certain liquid level inside the filter tank, and then flows out through the outlet pipe. The breathing valve installed on the top of the constant liquid level device closes as the liquid level rises to prevent water from overflowing; when the filter tank is backwashed and drained, the constant liquid level device drops as the filter tank liquid level drops, and the breathing valve automatically opens to exhaust as the liquid level drops. Connect the water inlet flange of the constant liquid level device to the water outlet flange of the filter tank.

[0009] Figure 2 For the use example of the utility model, Figure 2 In the figure, 20 is the filter tank, 21 is the water inlet, 22 is the area to be filtered, 23 is the filter layer, 24 is the clean water area, and 25 is the normal working liquid level of the filter tank. Water enters the clean water area from the area to be filtered through the filter material layer, and then enters the constant liquid level device. The water flows in the direction of the arrow in the figure. The normal working liquid level in the filter tank is controlled by the overflow pipe height of the constant liquid level device, so as to maintain the stability of the filter tank liquid level, so that there is sufficient hydrostatic pressure in the filter material layer, and the air blocking phenomenon is prevented, and air inlet is prevented.

Claims

1. A device for preventing air from entering a filter material layer of a filter tank, comprising a constant liquid level pipe, It is characterized in that The upper and lower ends of the constant liquid level tube are both sealed with blind plates for welding. An overflow pipe is placed inside the constant liquid level tube. The bottom of the overflow pipe is fixed on the blind plate at the bottom end of the constant liquid level tube. Two through holes are opened in the lower part of the constant liquid level tube. One through hole is connected to a water inlet flange connected to the outlet pipe of the filter tank, and the other through hole is provided with an outlet pipe which is closed and connected to the through hole. The top end of the outlet pipe is closed and connected to the outlet opened on the overflow pipe.

2. A device for preventing air from entering a filter material layer of a filter tank according to claim 1, It is characterized in that The top blind plate of the constant liquid level pipe is provided with an air hole, and the air hole is connected to the vent valve.

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