Pre-filter sewage structure and pre-filter

Abstract

The utility model relates to water purification equipment technical field discloses a prefilter's blowdown structure and prefilter, prefilter's blowdown structure includes filter drum and support frame, and the bottom of filter drum is equipped with blowdown hole, and blowdown hole is gradually set down obliquely from outside to inside along the radial direction of filter drum, support frame includes the inner ring part of sealed wear in the bottom of filter drum, and the inner ring part is hollowly arranged and can be axially moved between the filter position and blowdown position relative to filter drum, and the sidewall of inner ring part is equipped with a plurality of first blowdown holes that are spaced apart along its circumferential direction, when the inner ring part is located in the filter position, a plurality of first blowdown holes are staggered with blowdown hole and cut off, when support frame is located in blowdown position, a plurality of first blowdown holes are coincident with blowdown hole, and the inner chamber of filter drum is communicated with the inner chamber of inner ring part through blowdown hole, a plurality of first blowdown holes. The prefilter's blowdown structure and prefilter provided by the utility model can improve blowdown capacity and improve blowdown efficiency.

Claims

1. The sewage discharge structure of a pre-filter, characterized in that, include: The filter cylinder (20) has a drain hole (223) at its bottom, and the drain hole (223) is arranged to gradually slope downward from the outside to the inside along the radial direction of the filter cylinder (20); The support frame (50) includes an inner ring (52) that is sealed and passes through the bottom of the filter cylinder (20). The inner ring (52) is hollow and can move axially between the filter cylinder (20) and the drain position. A plurality of first drain holes (522) are provided on the side wall of the inner ring (52) and are spaced apart along its circumference. When the inner ring (52) is in the filtration position, the plurality of first drain holes (522) are offset from and cut off from the drain hole (223); when the inner ring (52) is in the drain position, the plurality of first drain holes (522) coincide with the drain hole (223), and the inner cavity of the filter cylinder (20) is connected to the inner cavity of the inner ring (52) through the drain hole (223) and the plurality of first drain holes (522).

2. The sewage discharge structure of the pre-filter according to claim 1, characterized in that, The inner ring (52) is sealed to the filter cartridge (20) by a fourth sealing ring (53).

3. The sewage discharge structure of the pre-filter according to claim 1, characterized in that, The support frame (50) also includes an outer ring (51), which is connected to the outer periphery of the inner ring (52). A second drain hole (511) is provided on the outer ring (51). A sealing protrusion (2212) is provided at the bottom of the filter cylinder (20). A third drain hole (523) is provided on the side wall of the inner ring (52) away from the filter cylinder (20). When the outer ring (51) is in the drain position, the second drain hole (511) is opened, and the outer space of the filter cylinder (20) is connected to the inner cavity of the inner ring (52) through the second drain hole (511) and the third drain hole (523); when the outer ring (51) is in the filter position, the sealing protrusion (2212) blocks the second drain hole (511).

4. The sewage discharge structure of the pre-filter according to claim 3, characterized in that, The outer ring (51) and the sealing protrusion (2212) are sealed by a sixth sealing ring (55).

5. The sewage discharge structure of the pre-filter according to claim 3, characterized in that, The number of the second drain holes (511) is set to multiple, and the multiple second drain holes (511) are evenly spaced along the circumference of the outer ring portion (51); And / or, the number of the third drain holes (523) is set to multiple, and the multiple third drain holes (523) are evenly spaced along the circumference of the inner ring (52).

6. The sewage discharge structure of the pre-filter according to claim 3, characterized in that, The outer ring (51) is bowl-shaped, and the second drain hole (511) is located at the bottom of the bowl of the outer ring (51).

7. The sewage discharge structure of the pre-filter according to claim 3, characterized in that, The first drain hole (522) is wider at the outside and narrower at the inside, and / or the second drain hole (511) is wider at the top and narrower at the bottom.

8. The sewage discharge structure of the pre-filter according to claim 1, characterized in that, The filter cylinder (20) includes a filter screen (21) and a support (22). The filter screen (21) is a cylindrical structure with openings at both ends. The support (22) is fitted and sleeved on the outside of the filter screen (21). The inner ring (52) is sealed and inserted through the bottom of the support (22).

9. The sewage discharge structure of the pre-filter according to claim 8, characterized in that, The bracket (22) includes an outer ring bracket (221) and an inner ring bracket (222). The outer ring bracket (221) is fitted and sleeved on the outside of the filter screen (21). The inner ring bracket (222) is connected to the bottom of the inner side of the outer ring bracket (221). The inner ring part (52) is sealed and inserted into the inner ring bracket (222). The inner bottom surface of the outer ring bracket (221) is gradually inclined downward from the outside to the inside along its radial direction and together with the inner ring bracket (222) defines the drain hole (223).

10. A pre-filter, characterized in that, The filter includes a filter bottle (10) and a pre-filter drainage structure as described in any one of claims 1-9. The drainage structure of the pre-filter is disposed inside the filter bottle (10). A drainage port (124) is provided at the bottom of the filter bottle (10). The drainage port (124) can be selectively opened or closed. When the drainage port (124) is closed, the inner ring (52) is located at the filtration position. When the drainage port (124) is open, the inner ring (52) is located at the drainage position. The inner cavity of the inner ring (52) is connected to the drainage port (124).

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