Double-layer filter with flow limiting device

Abstract

The invention discloses a double-layer filter with a flow limiting device. The double-layer filter comprises an upper filter body, a stainless steel fine filter screen, a lower filter body, a plasticcoarse filter screen, fasteners, fastener holes and a flow limiting channel. According to the double-layer filter, the stainless steel fine filter screen is placed in an upper square cavity of the lower filter body, the upper filter body is connected with the lower filter body in a fastened manner through the fasteners on two sides, the plastic coarse filter screen is designed at the bottom of thelower filter body, double filter functions are achieved, the channel for communicating the filter screens is arranged between the coarse filter screen and the fine filter screen, a flow limiting function is achieved by designing the size of the channel, the service life of a water inlet valve is guaranteed, and GB 26730 national standard flow requirements are met. The double-layer filter has theadvantages of ingenious structure, reliable functions, less quality control difficulty and low cost.

Description

technical field [0001] The invention relates to the related field of water inlet valves of toilet water tank accessories, in particular to a double-layer filter with a flow limiting device. Background technique [0002] Most of the existing toilet seat water inlet valves are filter mesh structures formed by plastic molds. Due to the limitation of the mold structure, the minimum gap can only reach a length of 0.2mm-0.5mm. The filtering effect is not good, and impurities are easy to pass through the gap. The sealing surface of the water inlet valve causes water leakage. There is also an integral molding structure in which stainless steel mesh is injected into the plastic. The device generally uses another part other than the filter to limit the flow independently, or through the overall waterway layout of the water inlet valve, the tap water pressure flow is limited to the requirements of the national standard GB26730, and another part realizes the flow limitation of the water...

AI Technical Summary

Problems solved by technology

[0002] Most of the existing toilet seat water inlet valves are filter mesh structures formed by plastic molds. Due to the limitation of the mold structure, the minimum gap can only reach a length of 0.2mm-0.5mm. The filtering effect is not good, and impurities are easy to pass through the gap. The sealing surface of the water inlet valve causes water leakage. There is also an integral molding structure in which stainless steel mesh is injected into the plastic. The device generally uses another part other than the filter to limit the flow independently, or through the overall waterway layout of the water inlet valve, the tap water pressure flow is limited to the requirements of the national standard GB26730, and another part realizes the flow limitation of the water inlet valve In terms of function, because the user needs to remove the filter for cleaning after long-term use of the water inlet valve, the current limiting function part is often placed at the rear end of the filter net. The appearance of the valve cannot be found at all, unless the high and low pressure flow test required by the GB26730 national standard (which takes about five minutes) can be found, which leads to difficulties in quality control and high cost of control. The overall waterway layout of the water inlet valve realizes the flow limiting function At the same time, it can only be realized when multiple internal parts need to be coordinated. There are many quality control objects and it is difficult. At the same time, because they are all internal parts of the water inlet valve, it is also difficult to find out whether they have the current limiting function.

Images