Waste-water return-flow system flow compensation method and flow compensation valve

Abstract

The invention discloses a flow compensating method for waste water return system, arranging a flow compensating valve on system pipeline, where the valve body is equipped with a water inlet channel connected with the waste water outlet of a water filtering system and a water outlet connected with the inlet of the water filtering system, the valve cavity is equipped with a control rod placed in the water inlet channel, and the gap between the control rod and the water inlet channel form a waste water channel, the control rod can move with the change of water outlet pressure and the moving distance of the control rod makes the length of the waste water channel change in inverse proportion to the water outlet pressure, or makes the area of the waste water channel change in proportion to the water outlet pressure, and on the condition of pulsation of water outlet pressure, it adjusts the flow in the valve cavity to adapt to the change of pipeline pressure so as to make water resistance and cross-section area of the water inlet channel correspondingly change, to make the waste water return flow keep stable water resistance and constant waste water ratio.

Description

【Technical field】 [0001] The invention relates to a flow compensation method, in particular to a flow compensation method and a flow compensation valve applied to the backflow of waste water in a water filtration system. 【Background technique】 [0002] At present, in the field of water treatment, if you want to obtain pure water, you can use RO membrane or nanofiltration membrane to filter out all impurities in the water, including minerals. However, when 1 liter of pure water is filtered out, 2-6 liters of waste water (also called concentrated water) will be produced at the same time, and the impurities in the water, including minerals, will be taken away by the waste water, otherwise the concentration of minerals will be too high. The filter membrane is clogged, rendering it ineffective. In a water filtration system, the ratio of waste water to pure water should be a certain value, which is generally called the waste water ratio. It forms a fixed water resistance when th...

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Problems solved by technology

[0004] In the wastewater return flow of the water filtration system, if the above-mentioned structure is used to maintain the pressure balance and flow constant, it can only balance the pressure on both sides of the elastic diaphragm, but cannot achieve the stability of wastewater water resistance and system flow

At the same time, since the water inlet and the water outlet are not in the same cavity, when the system pressure, that is, the pressure of the water outlet is high, the above-mentioned solution in the prior art will cause the elastic diaphragm to drive the conical valve core to move to the water inlet, causing the water inlet to The flow channel area decreases and the water resistance increases; when the system pressure, that is, the water outlet pressure is small, the elastic diaphragm will drive the conical valve core to leave the water inlet, resulting in an increase in the flow channel area of ​​the water inlet and a decrease in water resistance. , cannot provide stable water resistance and flow for wastewater backflow

Therefore, for water filtration systems, it is not possible to maintain a constant wastewater ratio with the existing pressure balance valve structure.

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