KR20210088393A - Screw conveyor for transfering and discharging sludge stored in the sludge reservoir - Google Patents

Abstract

The present invention relates to a screw conveyor for transferring and discharging sludge stored in a sludge storage tank and, more specifically, to a screw conveyor for transferring and discharging sludge stored in a sludge storage tank, which is installed in a lower part of a sludge storage tank, and is capable of preventing leachate or sludge from being spilled (leaked) during the procedure of transferring and discharging the sludge stored in the sludge storage tank. In accordance with the present invention, a combination protrusion and a combination groove, which are engaged and rotated while kept coupled with each other, are placed in a sludge spillage channel between a shaft and the inside of a casing to block the sludge spillage channel connected to a gap between the casing and the shaft and, as a result, the sludge can be prevented from being spilled through the gap between the casing and the shaft to suppress the generation of odors caused by the spillage of leachate or sludge, and the corrosion of components can be prevented so as to prevent reduction in the lifespan thereof.

Description

Screw conveyor for transporting and discharging the sludge stored in the sludge storage tank {SCREW CONVEYOR FOR TRANSFERING AND DISCHARGING SLUDGE STORED IN THE SLUDGE RESERVOIR}

The present invention relates to a screw conveyor for transporting and discharging sludge stored in a sludge storage tank, installed under the sludge storage tank, and preventing leachate or sludge from flowing out (leakage) in the process of transporting and discharging the sludge stored in the sludge storage tank It relates to a screw conveyor for transporting and discharging sludge stored in a sludge storage tank that can be prevented.

In general, sludge refers to a sediment generated by separating floating matter in water from a liquid in the process of water purification and sewage/wastewater treatment. It is usually generated in the water treatment process of tap water, industrial water, industrial wastewater, sewage and manure, and the suspended matter in the water is a solid that is deposited on the bottom of the sedimentation tank by gravity and contains a lot of water. Due to this, the potential environmental risk is high due to the inclusion of perishable, pathogenic, and harmful substances, so the sludge treatment issue is very important in terms of environmental conservation and recycling of useful resources.

In particular, the sludge (sewage residue) generated during the treatment of sewage and wastewater has a very high content of organic matter, which is highly perishable, and has a large volume due to its high water content. And, since various pathogens exist, it causes odor and is harmful to health and hygiene. For this reason, when the sludge is finally disposed of, the volume is reduced to facilitate handling and transport, thereby reducing the disposal cost, while stabilizing the sludge to prevent secondary contamination by decomposing organic matter, and killing pathogens for hygiene reasons. The purpose is to treat the sludge for safety.

The method of treating sludge may vary depending on the type of final disposal and local conditions, but it is generally determined by a rational combination of unit processes leading to concentration, digestion, dewatering, and landfill. At this time, the most economical and efficient treatment method should be selected by comprehensively reviewing and evaluating the characteristics of sludge, treatment efficiency, facility size, final disposal plan, location conditions, construction and maintenance costs, difficulty of management, and environmental pollution measures.

Briefly describing the currently used sewage sludge treatment process, "sludge loading → sludge storage (sludge storage tank) → sludge drying / dewatering (drying / dehydrating machine) → dry material storage (dry material storage tank) → discharge" It is made including the process. A screw conveyor is usually used to transport and discharge the sludge stored in the sludge storage tank to the sludge dryer/dehydrator.

1 is a diagram schematically illustrating a screw conveyor according to the prior art.

1, the screw conveyor according to the prior art is a device for transporting and discharging sludge discharged from the sludge storage tank 1, and the casing 2 installed in the lower part of the sludge storage tank 1, and the length of the casing 2 A shaft 3 coupled through in the direction, a braider 4 formed on the shaft 3, a reduction motor 5 installed outside the casing 2 and rotating the shaft 3, and a reduction motor ( 5) and a chain cover (6) covering the chain that transmits the driving force to the shaft (3).

In this screw conveyor, when sludge is introduced into the casing (2) from the sludge storage tank (1), the shaft (3) rotates in the casing (2) by the driving force of the reduction motor (5), and in this process, the casing ( 2) The sludge injected into the inside is transferred to one side of the casing 2 by the blade 4 rotating by the shaft 3 and discharged to the outside through the outlet.

And, in the screw conveyor according to the prior art, a gland packing 7 is additionally installed between the shaft 3 and the casing 2 . The gland packing 7 is installed between the casing 2 in a state of close contact with the shaft 3 by the gland packing housing 8, and the leachate or sludge is formed in the gap between the shaft 3 and the casing 2 . block the leak.

However, in the screw conveyor according to the prior art, since the shaft 3 is a driving body that continuously rotates during operation, the shaft 3 and the gland packing ( 7) There was a gap between the shafts, and the leachate and sludge leaked out and gave off a bad odor, which worsened the working environment. On the other hand, the bearing block (9) installed between the shaft (3) and the casing (2), the chain, and the deceleration There was a problem such as shortening the life of the screw conveyor by corroding parts such as the motor 5 and the like.

KR 20-0468318 Y1, 2013. 07. 31.

Therefore, the present invention has been proposed to solve the above problems, and it fundamentally blocks the outflow of leachate or sludge to the outside in the process of transporting and discharging the sludge stored in the sludge storage tank, thereby preventing the generation of odors due to the outflow of the leachate or sludge. An object of the present invention is to provide a screw conveyor for transporting and discharging sludge stored in a sludge storage tank that can prevent the corrosion of parts and shorten their lifespan.

The present invention according to one aspect for achieving the above object is installed in the sludge storage tank, the casing into which the sludge stored in the sludge storage tank is put; a shaft coupled through both ends in the longitudinal direction of the casing so that both ends protrude to the outside of the casing; a braider formed on the outer circumferential surface of the shaft and rotating together with the shaft to transfer the sludge; a reduction motor installed on the outside of the casing and rotating the shaft; Rotating protrusions for preventing water leakage that are installed on one side or both sides of the shaft so as to be close to the inside of both sides of the casing inside the casing and rotate with the shaft; And it is installed on the inside of the casing to face the leak-preventing rotary protrusion, and the leak-preventing rotary protrusion engages to block the outflow path of the sludge. It provides a screw conveyor for transporting and discharging the sludge stored in the sludge storage tank comprising a leak-proof coupling groove that blocks the outflow path. do.

In addition, at least one coupling protrusion protruding in the shape of a finger in the direction in which the coupling groove for preventing water leakage is formed is formed in the rotation protrusion for preventing water leakage, and the coupling protrusion is inserted into the coupling recess for preventing leakage in correspondence with the coupling protrusion. A coupling groove may be formed.

In addition, the coupling protrusion and the coupling groove may be formed in a circular shape so that the rotation protrusion for preventing water leakage is rotatable by interlocking with the shaft when the shaft rotates in a state in which they are engaged with each other.

In addition, the gland packing installed between the shaft and the casing protruding to the outside of the casing; a gland packing housing for closely contacting the gland packing between the shaft and the casing; and a compression spring installed between the grand packing housing and the grand packing to press the grand packing in the shaft direction to bring the grand packing into close contact with the shaft.

In addition, it is inserted into the through hole passing through the coupling groove of the coupling groove for preventing water leakage, and compressed air is sprayed between the coupling grooves to which the coupling protrusions are coupled to form an air curtain between the coupling protrusions and the coupling grooves, thereby eliminating odors. Further comprising a spray nozzle to block the outflow, the compressed air may be heated to a temperature of 50 ~ 100 ℃.

As described above, according to the screw conveyor according to the present invention, a coupling protrusion and a coupling groove that rotate while engaged with each other in a male and female coupling state are disposed in the sludge outflow path between the inner side of the casing and the shaft, leading to a gap between the casing and the shaft. By blocking the outflow path of the sludge in advance, it prevents the sludge from leaking into the gap between the casing and the shaft, thereby suppressing the generation of odors due to the outflow of leachate or sludge, while preventing corrosion of parts and shortening the lifespan. it can be prevented

1 is a view showing a screw conveyor according to the prior art.
2 is a view showing a screw conveyor according to an embodiment of the present invention.
Figure 3 is an enlarged perspective view of the portion 'A' shown in Figure 2;
Figure 4 is a view showing the rotation direction of the rotation protrusion for preventing water leakage according to the present invention.
5 is a view showing a screw conveyor according to another embodiment of the present invention.
6 is a view showing a screw conveyor according to another embodiment of the present invention.

Advantages and features of the present invention, and methods for achieving them, will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms.

Hereinafter, the technical features of the present invention will be described in detail with reference to the accompanying drawings.

2 is a diagram schematically illustrating a screw conveyor according to an embodiment of the present invention.

2, the screw conveyor according to the embodiment of the present invention includes a casing 12 installed in the lower portion of the sludge storage tank 11, a shaft 13 through-coupled in the longitudinal direction of the casing 12, and a shaft ( It includes a braider 14 formed in 13), a reduction motor 15 installed on the outside of the casing 12 and coupled to the shaft 13 through a chain to rotate the shaft 13.

The end or both ends of the shaft 13 are provided with leak-preventing rotating protrusions 13a for preventing leakage of leachate and sludge, and correspondingly, the rotating protrusions 13a for preventing leaks are inserted into both inner sides of the casing 12 in response. A coupling groove (12a) for preventing water leakage is provided.

The rotation protrusion 13a for preventing leakage is formed integrally with the shaft 13 or is fastened and fixed to surround the outer surface of the shaft 13 through a fastening member such as a welding fastening method or a bolt, and interlocks with this when the shaft 13 rotates. It rotates along the coupling groove (12a) for preventing water leakage.

FIG. 3 is an enlarged perspective view of a portion 'A' shown in FIG. 2, and FIG. 4 is a view illustrating a process in which the water leakage preventing rotation protrusion rotates according to the present invention.

3 and 4, at least one, preferably two or more coupling protrusions (b) that protrude in the form of a finger in the leakage preventing rotation protrusion (13a) according to the present invention in the direction of the leakage preventing coupling groove (12a) direction (b) is formed. And, corresponding to this, the coupling groove (12a) for preventing leakage is formed with a coupling groove (g) into which the coupling protrusion (b) is inserted, respectively.

The engaging protrusion (b) and the engaging groove (g) each have a circular structure so that the engaging projection (b) can rotate while being engaged with the engaging groove (g). That is, the coupling protrusion (b) is male and female coupled to the coupling groove (g) to engage with each other, and when the rotation protrusion 13a for preventing water leakage is rotated by the shaft 13 in the interlocked state of the coupling groove portion 12a for preventing water leakage It rotates along the coupling groove (g).

The sludge is fed into the casing 12, and the shaft 13 is rotated by the reduction motor 15 to move the sludge to the outlet 20 in the casing 12. In the process of moving the sludge to the outlet 20, the shaft 13 is transferred by pressure. ) and the casing 12 may be pushed out into these gaps.

Therefore, in the present invention, the inner side of the casing 12 and the shaft 13 by arranging the coupling protrusion (b) and the coupling groove (g) coupled to each other in the sludge outflow path between the inner side of the casing 12 and the shaft 13 ) by blocking the outflow path of the sludge leading to the gap in advance, it is possible to prevent the sludge from flowing out into the gap between the inner side of the casing 12 and the shaft 13 .

In addition, in the screw conveyor according to the embodiment of the present invention, a gland packing 17 may be additionally installed between the shaft 13 and the casing 12 . The gland packing 17 is closely adhered to the shaft 13 protruding to the outside of the casing 12 by the gland packing housing 18 .

5 is a diagram illustrating a screw conveyor according to another embodiment of the present invention, and for convenience of description, a part of the screw conveyor is enlarged.

5, the screw conveyor according to another embodiment of the present invention penetrates through the coupling groove g of the casing 12 and the coupling groove 12a for preventing water leakage in addition to the configuration of the screw conveyor shown in FIG. It further includes a spray nozzle 21 which is inserted through the hole and sprays compressed air between the coupling grooves g to which the coupling protrusions (b) are coupled to form an air curtain.

A plurality of injection nozzles 21 are respectively installed in a circular shape on both sides of the casing 12 having a cylindrical structure, and are supplied with compressed air through a compressor (not shown) between the coupling protrusion (b) and the coupling groove (g). The air curtain (a) is formed in the outflow path by blowing compressed air through the gap.

In addition, the injection nozzle 21 may be heated to a predetermined temperature, or may receive compressed air heated to a predetermined temperature and spray into the casing 12 . Accordingly, the compressed air injected through the injection nozzle 21 is injected into the casing 12 while being heated to a predetermined temperature.

When compressed air heated to a certain temperature through the injection nozzle 21 is injected into the casing 12, sludge, particularly the sludge moving to both sides of the casing 12 through which the shaft 13 penetrates, is compressed by the compressed air. As it dries, the moisture content is lowered, thereby reducing the leachate contained in the sludge to prevent leakage. At this time, the temperature of the compressed air may be approximately 50 ~ 100 ℃.

The rotation protrusion 13a for preventing water leakage and the coupling groove 12a for preventing water leakage can prevent leakage of leachate or sludge through the coupling protrusion b and coupling groove g that engage with each other, but the odor made of fine particles is combined. It may flow out into the gap between the projection (b) and the coupling groove (g).

That is, the rotation protrusion 13a for preventing water leakage is rotated without interference in a state in which the coupling protrusion b is engaged with the coupling groove g of the coupling groove 12a for preventing water leakage. The coupling protrusion b and the coupling groove g) They are spaced apart at regular intervals. Accordingly, gaps may be formed at regular intervals between the coupling protrusions (b) and the coupling grooves (g), and odors in the form of fine particles may flow out through the gaps.

Therefore, the screw conveyor according to another embodiment of the present invention is between the coupling protrusion (b) and the coupling groove (g) in a state that does not receive interference by the water leakage preventing coupling groove portion (12a) when the water leakage preventing rotation protrusion (13a) rotates. By injecting compressed air into the gap of the sludge to form an air curtain on the sludge outflow path, it is possible to prevent the odor from escaping into the sludge outflow path.

6 is a diagram illustrating a screw conveyor according to another embodiment of the present invention, and for convenience of explanation, a part of the screw conveyor is enlarged.

Referring to FIG. 6 , in the screw conveyor according to another example of the present invention, a compression spring 22 is installed inside the gland packing housing 18 ′ for closely fixing the gland packing 17 to the shaft 13 . The sealing force is improved by pressing the packing 17 in the direction of the shaft 13 .

A lifting phenomenon occurs between the gland packing 17 and the shaft 13 when the shaft 13 rotates, and this may cause odors to leak out. In another embodiment of the present invention, the gland packing 17 is compressed by a compression spring. By continuously pressurizing using (22), the adhesion between the gland packing 17 and the shaft 13 is improved, thereby preventing odors from leaking out.

As described above, the technical idea of the present invention has been specifically described in the preferred embodiment, but the preferred embodiment is for the purpose of explanation and not for limitation. As such, those of ordinary skill in the art will be able to understand that various embodiments are possible through combination of embodiments of the present invention within the scope of the technical spirit of the present invention.

1, 11: sludge storage tank
2, 12: casing
3, 13: shaft
4, 14: Braider
5, 15: reduction motor
6, 16: chain cover
7, 17: Grand packing
8, 18, 18' : Gland packing housing
9, 19: bearing block
12a: coupling groove for preventing water leakage
13a: rotation protrusion for preventing water leakage
20: outlet
21: spray nozzle
22: compression spring
b: bonding protrusion
g: coupling groove

Claims (4)

a casing installed in the sludge storage tank and into which the sludge stored in the sludge storage tank is put;
a shaft coupled through both ends in the longitudinal direction of the casing so that both ends protrude to the outside of the casing;
a braider formed on the outer circumferential surface of the shaft and rotating together with the shaft to transport the sludge;
a reduction motor installed on the outside of the casing and rotating the shaft;
Rotating protrusions for preventing water leakage which are installed on one side or both sides of the shaft so as to be close to the inside of both sides of the casing inside the casing and rotate together with the shaft; and
a coupling groove for preventing leakage installed on the inside of the casing so as to face the rotation protrusion for preventing water leakage, and interlocking with the rotation protrusion for preventing water leakage to block the outflow path of the sludge;
A screw conveyor for transporting and discharging sludge stored in a sludge storage tank comprising a.
The method of claim 1,
At least one coupling protrusion protruding in the direction in which the water leakage preventing coupling groove is formed is formed in the water leakage preventing rotation protrusion, and the coupling protrusion is inserted into the water leakage preventing coupling recess corresponding to the coupling protrusion to engage with the coupling groove is formed. Screw conveyor for transporting and discharging the sludge stored in the sludge storage tank.
3. The method of claim 2,
The coupling protrusion and the coupling groove are each interlocked with each other, and when the shaft rotates, it interlocks with the shaft to allow the rotation protrusion for preventing water leakage to rotate. A screw conveyor for transporting and discharging sludge stored in a circular sludge storage tank.
The method of claim 1,
a grand packing installed between the shaft and the casing protruding to the outside of the casing;
a gland packing housing for closely contacting the gland packing between the shaft and the casing; and
a compression spring installed between the gland packing housing and the gland packing to press the gland packing in the shaft direction to bring the gland packing into close contact with the shaft;
Screw conveyor for transporting and discharging the sludge stored in the sludge storage tank further comprising a.

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