JP4846753B2 - Sediment pressure feeding device - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a residue pressure feeding device, and more particularly, to a residue pressure feeding device capable of smoothly feeding compressed residue in a residue conveyance tube without blocking by preventing water leakage from the residue conveyance tube. Is.

  Usually, for example, sewage and rainwater contain residues such as wood pieces, paper pieces, vinyl pieces, cloth pieces, and dead leaves in addition to sand and earth.

  Sewage and rainwater containing contaminants such as sand, earth, and residue are sent to the sewage treatment facility as sewage, where the contaminants are removed, treated, and discharged into rivers, etc. The The collected residue is subjected to a process such as an incineration process.

  FIG. 5 shows an example of a sewage treatment facility. This sewage treatment facility includes a sand basin 1, an adjustment tank 3 provided with a conveyor 2, a screen presser 4 and a screen storage hopper 5.

  The sewage flows into the sand basin 1 and slowly flows through the sand basin 1, and the sand in the sewage settles and accumulates in a pit (not shown) of the sand basin 1. The sand and earth accumulated in the pit are periodically scraped out of the sand basin 1 by a scraper (not shown). Sediment residue (S) in the sewage is scraped out of the settling basin 1 by a dust remover (not shown) and then conveyed to the adjustment tank 3. On the other hand, the sewage from which the sand, earth, and residue (S) have been removed is discharged from the settling basin 1 into a river or sent to the next processing step.

  An example of the above residue pressure feeding device 4 is disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2007-314310). Hereinafter, the residue pressure feeding device 4 will be referred to as a residue pressure feeding device and will be described with reference to the drawings.

  FIG. 6 is a schematic view showing a conventional residue pressure feeding apparatus.

  As shown in FIG. 6, the conventional residue pumping device includes a residue input popper 6, a discharge piston 7, a discharge cylinder 8 in which the discharge piston 7 reciprocates, and a valve box 9 provided on the discharge side of the discharge cylinder 8. In the vicinity of the connection between the piston pump 11 having the gate valve 10 accommodated in the container, the residue transport pipe 12 connected to the discharge cylinder 8 via the gate valve 10, and the residue transfer pipe 12 as the gate valve 10. Water supply means 13 for compressing and supplying water to the residue in the residue transport pipe 12 is provided.

  Depending on the nature of the residue (S), this water supply means may not be provided.

  The residue (S) charged into the adjustment tank 3 is charged into the residue charging hopper 6 of the piston pump 11 by the conveyor 2. The residue (S) charged in the residue input hopper 6 is sent into the discharge cylinder 8 with the gate valve 10 closed, and then compressed by the advance of the discharge piston 7, and the residue (S) is compressed. Ends.

  When the residue (S) is compressed in this way, the gate valve 10 is opened, and then the discharge piston 7 moves forward. As a result, the residue (S) in the discharge cylinder 8 is pushed into the residue transport pipe 12. Thus, when the pumping of the residue (S) for one stroke is completed, the gate valve 10 is closed, and the extrusion process of the residue (S) is completed.

  Thereafter, water supply from the water supply means 13 to the compressed residue (S) pushed out to the residue transport pipe 12 is started. During this time, the discharge piston 7 moves backward. Water supply continues during this time. Then, the discharge piston 7 moves back to the operation start position of the next second cycle and stops. During this time, new residue is filled in the discharge cylinder 8. Water supply continues during this time. In this way, the residue (S) filling process is completed.

  The reason why the compressed residue (S) is supplied with water from the water supply means 13 is as follows.

  The nature of the residue (S) varies depending on the weather. In other words, paper and cloth occupy the majority of the residue component in fine weather, and vegetation accounts for the majority of the residue component in rainy weather. Therefore, the bulk density of the screen residue (S) during rainy weather is lower than the bulk density of the screen residue (S) during clear weather. When such bulk density is low and the residue (S) is pushed into the residue transport pipe 12 by the piston pump 11, it is easy to consolidate. Once the residue (S) is compacted in the residue transport pipe 12, the frictional resistance with the inner wall surface of the residue transport pipe 12 becomes large, and in some cases, pressure feeding cannot be performed.

JP 2007-314310 A

  According to the above-described conventional residue pressure feeding device, even when the bulk density is low or when it is rainy, by providing the water supply means 13 to the residue transfer pipe 12, the residue (S) is transferred as the residue. The frictional resistance between the pipe 12 and the inner wall surface of the pipe 12 is reduced, and the residue (S) can be transported to the residue storage hopper 5 of the sewage treatment facility without causing the blockage of the residue transport pipe 12 due to compaction.

  However, the conventional residue pressure feeding device has a problem with respect to water tightness when the gate valve 10 is closed. Hereinafter, this problem will be described with reference to the drawings.

  FIG. 7 is a front view of a conventional residue-pumping device viewed from the direction of the residue transport pipe, FIG. 8 is a sectional view taken along line AA in FIG. 7, and FIG. 9 is an enlarged sectional view of a pusher portion.

  As shown in FIGS. 7 to 9, the gate valve 10 is slidably accommodated between a pair of valve seats 15 </ b> A and 15 </ b> B in the valve box 9 and is advanced and retracted by the hydraulic cylinder 16 (four in this example). As described above, the rod-shaped pusher 17 is pressed against the valve seat 15A on the side of the residue transport pipe 12 during the filling process to the compression process, that is, while the gate valve 10 is closed. The water compressed from 13 and supplied to the residue (S) is prevented from leaking to the discharge cylinder 8 side. At this time, when the gate valve 10 is pressed by the pusher 17, a gap (L2) is formed between the gate valve 10 and the valve seat 15B on the discharge cylinder 8 side.

  However, the gate valve may be caused by, for example, a foreign object biting between the surface of the gate valve 10 on the side of the residue transport pipe 12 and the valve seat 15A, or a surface defect of the gate valve 10 on the side of the residue transport tube 12. As shown in FIG. 9, a gap (G) is generated between the surface of the 10 residue transport pipe 12 side and the valve seat 15A, and the residue (S) in fine weather is compressed from this gap (G). The separated water separated from the residue component or the water from the water supply means 13 leaks to the discharge cylinder 8 side through the gap (L2) to form the residue (S) and the inner wall surface of the residue transport pipe 12. There has been a problem that the frictional resistance increases.

  Accordingly, an object of the present invention is to provide a residue pumping device that can reliably prevent water leakage from the residue transfer tube in order to prevent the residue transfer tube from being blocked by compaction.

  The present invention has been made to achieve the above object, and is characterized by the following.

  According to the first aspect of the present invention, there is provided a discharge pump, a discharge cylinder, a piston pump having a gate valve housed in a valve box provided on a discharge side of the discharge cylinder, and the discharge cylinder via the gate valve. In a screen pressure feeding device including a screen residue transporting pipe connected thereto, it is in close contact with at least one outer peripheral portion of the screen residue transporting pipe and the discharge cylinder so as to be able to advance and retreat, and one end of the gate valve is closed when the gate valve is closed. Is provided with a slide ring which is pressed against the gate valve and prevents water leakage from the residue transport pipe.

  The invention according to claim 2 is the water supply device for supplying water to the compressed residue in the residue transport pipe in the vicinity of the connecting portion between the gate valve and the residue transport pipe in the residue pumping device according to claim 1. It is characterized by providing means.

  According to this invention, in order to prevent clogging of the residue transport pipe due to compaction, water leakage from the residue transport pipe can be reliably prevented.

  Hereinafter, an embodiment of the residue pressure feeding device of the present invention will be described with reference to the drawings.

  FIG. 1 is a partial sectional view showing the residue pumping device of the present invention with the gate valve opened, FIG. 2 is a partial sectional view showing the residue pumping device of the present invention with the gate valve closed, and FIG. It is a fragmentary sectional view which shows the residue pressure feeding apparatus of this invention which the slide ring advanced and closely_contact | adhered with the gate valve.

  1 to 3, the same reference numerals as those in FIGS. 7 to 9 denote the same items. That is, 7 is a discharge piston, 8 is a discharge cylinder in which the discharge piston 7 reciprocates, 9 is a valve box that houses a gate valve, 10 is a gate valve in which an opening 10A is formed, and 11 is from these 7 10 is a piston pump connected to the discharge cylinder 8 via a gate valve 10; 13 is a residue transport pipe connected to the residue transport pipe 12; A water supply means 14 for supplying water to the slag and 14 is a slide ring that is concentrically attached to the outer peripheral portion of the residue transport pipe 12 so as to be movable forward and backward. In this example, the valve seat 9 is not provided with a valve seat in the valve box 9 unlike the conventional residue pressure feeding device, but a valve seat may be provided. Further, depending on the properties of the residue, the water supply means 13 may not be provided.

  The slide ring 14 can be advanced and retracted by hydraulic pressure. When the slide ring 14 moves forward, the slide ring 14 is pressed against the gate valve 10 and is pressed against the surface of the gate valve 10 on the residue transport pipe 12 side. The slide ring 14 is made of, for example, SCM 440 in order to improve the adhesion with the gate valve 10.

  According to the present invention, as shown in FIG. 1, in the residue (S) extrusion process in which the gate valve 10 is open, the slide ring 14 is retracted away from the gate valve 10 by hydraulic pressure. As shown in FIG. 2, the slide ring 14 is retracted until the gate valve 10 is closed. Then, as shown in FIG. 3, the slide ring 14 is advanced in the direction of the gate valve 10 by hydraulic pressure from the filling process of the residue (S) to the compression process.

  A slight gap is formed on both sides of the gate valve 10, but as the gate valve 10 moves forward, the surface of the gate valve 10 on the side of the discharge cylinder 8 contacts the valve box 9, and the gate valve 10 A gap (L1) is formed between the surface on the side of the residue transport pipe 12 and the valve box 9.

  However, the gap (L1) is completely closed when the tip of the slide ring 14 disposed on the outer periphery of the residue transport pipe 12 is pressed against the surface of the gate valve 10 on the discharge cylinder 8 side. Accordingly, the foreign material is caught between the surface of the gate valve 10 on the discharge cylinder 8 side and the valve box 9 or the surface of the gate valve 10 on the discharge cylinder 8 side is lost, etc. Even if the adhesion between the surface of the valve and the valve box 9 is lost, the water from the water supply means 13 leaks through the gap (L1) to the discharge cylinder 8 side to form a residue (S) and a residue transport pipe 12 There is no problem that the frictional resistance with the inner wall surface of the pipe increases.

  The above example is a case where the slide ring 14 is provided on the residue transport pipe 12 side, but the slide ring 14 may be provided on the outer peripheral portion of the discharge cylinder 8 so as to advance and retreat as shown in FIG. In this case, the gap (L1) is formed on the discharge cylinder 8 side, but water from the residue transport pipe 12 passes through the valve box 9 and is also sealed by the slide ring 14, so that the gate valve The residue transfer tube 12 of the gate valve 10 may be caused by a foreign matter caught between the surface of the residue transfer tube 12 of the 10 and the valve box 9 or a surface defect on the residue transfer tube 12 side of the gate valve 10. Even if the adhesiveness between the surface of the valve and the valve box 9 is lost, water from the residue transport pipe 12 leaks through the gap (L1) to the discharge cylinder 8 side, and the residue (S) is formed as residue. There is no problem that the frictional resistance with the inner wall surface of the transport pipe 12 increases.

  Further, the slide ring 14 may be provided in close contact with the outer peripheral portions of both the residue transport pipe 12 and the discharge cylinder 8 so as to be able to advance and retract.

  As described above, according to the residue pumping device of the present invention, the gate valve is provided on the outer peripheral portion of at least one of the residue transfer pipe and the discharge cylinder so as to be able to advance and retreat. Even if the adhesion between the gate valve and the valve box is lost due to foreign matter getting caught between the valve and the valve box, or due to a surface deficiency of the gate valve, water leaks from the inside of the bed transfer pipe to form a screen. There is no problem that the frictional resistance with the inner wall surface of the residue transport pipe increases.

It is a fragmentary sectional view which shows the residue pressure feeding apparatus of this invention with the gate valve opened. It is a fragmentary sectional view which shows the residue pressure feeding apparatus of this invention with the gate valve closed. It is a fragmentary sectional view which shows the residue pressure feeding apparatus of this invention which the slide ring advanced and closely_contact | adhered with the gate valve. It is a fragmentary sectional view which shows the other residue pressure feeding apparatus of this invention. It is a block diagram which shows a sewage treatment facility. It is the schematic which shows the conventional residue pressure feeding apparatus. It is the front view which looked at the residue pressure feeding apparatus from the direction of the residue conveyance pipe conventionally. It is the sectional view on the AA line of FIG. It is an expanded sectional view of a pusher part.

Explanation of symbols

1: Sedimentation basin 2: Conveyor 3: Adjustment tank 4: Screen residue pumping device 5: Screen residue storage hopper 6: Screen residue injection hopper 7: Discharge piston 8: Discharge cylinder 9: Valve box 10: Gate valve 11: Piston pump 12 : Residue transport pipe 13: water supply means 14: slide ring 15A: valve seat 15B on the residue transport pipe side: valve seat 16 of the discharge cylinder: hydraulic cylinder 17: pusher

Claims (2)

A discharge pump, a discharge cylinder, a piston pump provided on the discharge side of the discharge cylinder and having a gate valve housed in a valve box; and a residue transport pipe connected to the discharge cylinder via the gate valve; In the residue pressure feeding device provided with
In close contact with the outer periphery of at least one of the residue transport pipe and the discharge cylinder, and at the end of the gate valve, one end thereof is pressed against the gate valve to prevent water leakage from the residue transport pipe. A shim pressure feeding device, characterized in that a slide ring is provided.   The screen pressure feeding device according to claim 1, further comprising a water supply means for supplying water to the compressed residue in the residue transport pipe in the vicinity of a connection portion between the gate valve and the residue transport pipe. .

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