KR20010050514A - Aeration system - Google Patents

Abstract

PURPOSE: To improve the performance and reliability of an aeration device by preventing foreign matters for coiling around a motor shaft. CONSTITUTION: A cross-sectionally L-shaped stop part is arranged at the outer peripheral part of a mechanical seal bracket 7, and a first clearance extended in a horizontal direction and a second clearance extended in a vertical direction are arranged between the edge part of the hub 36 of an impeller 8 and a mechanical seal bracket 7. The interval of the first clearance is set so as to be in a range from 0.5 mm to 2 mm, and the clearance of the second clearance is set so as to be in a range from 0.2 mm to 2 mm.

Description

Aeration System {AERATION SYSTEM}

The present invention relates to an aeration device used for purification of sewage.

Conventionally, as disclosed in Japanese Patent Laid-Open No. 61-38000 or Japanese Patent Laid-Open No. 63-51760, an axial flow vane connected to a motor shaft of an underwater motor is accommodated in the device casing. Background Art Aeration apparatuses are known in which a liquid to be treated such as sewage is sucked into a flow path by the rotation of an axial vane, and air is supplied to the liquid to be treated to perform aeration.

As shown in FIG. 3, the aeration device of this type divides the main body portion, which is formed by mounting the vane 203 at the distal end of the rotating shaft 202 of the underwater motor 201, and the flow path 204 of the liquid to be treated. The apparatus casing 205 and the air supply pipe 206 which supply air to the to-be-processed liquid in the flow path 204 are provided.

During operation, the vane 203 is rotated by driving the underwater motor 201. As a result, the to-be-processed liquid is sucked into the flow path 204 from the upper side, stirred and mixed with the air supplied from the air supply pipe 206, and then discharged from the discharge port 207 opened in the horizontal direction.

In general, a large amount of fibers such as hair is mixed in the target liquid to be treated by the aeration device. When such a fiber is entangled with the vane 203 or the motor rotating shaft 202, the load of a motor rises and the operation efficiency of an apparatus falls. Thus, in the conventional aeration device, the vane 203 is composed of a cylindrical rotating body 209 and a wing 210 provided on the outer circumference of the rotating body 209, and the upper edge of the rotating body 209 and the mechanical part. By reducing the gap between the mechanical seal bracket (208), foreign matters such as fibers or the like are not easily introduced into the rotating body 209, which is a mounting portion of the motor rotating shaft 202.

However, since the mechanical seal bracket 208 is a non-rotating body, the rotating body 209 is a rotating body, and when both of them come into contact with each other, there is a fear that wear and breakage will occur. Therefore, there is a limit to making the said gap small in order to prevent contact of both.

In the aeration device, the gap between the mechanical seal bracket 208 and the rotating body 209 is a straight gap 212 extending in the vertical direction, foreign matter such as fibers easily flow into the gap 212 from above, The foreign material 211 was easily clogged by the mounting portion of the motor rotating part 202. On the other hand, as shown in FIG. 4, the aeration apparatus provided with the clearance gap 213 of the horizontal direction between the mechanical seal bracket 208 and the rotating body 209 is also known. However, even in such an aeration device, since the gap 213 is formed in a straight shape, foreign matters such as fibers easily enter the rotating body 209 from the gap 213, and the foreign material 211 is attached to the mounting portion of the motor rotating shaft 202. It was easy to block.

If the vane 203 rotates while the foreign body is caught between the mechanical seal bracket 208 and the rotating body 209, the driving efficiency decreases or the vane 203 and the mechanical seal bracket 208 are worn or damaged. There was a fear of causing.

This invention is made | formed in view of such a point, Comprising: It aims at providing the aeration apparatus which is hard to get entangled in a motor rotating shaft etc. and is reliable.

1 is a cross-sectional view of the aeration apparatus according to the present embodiment.

2 is an enlarged cross-sectional view of the vicinity of the mechanical seal bracket.

3 is a cross-sectional view of a conventional aeration device.

4 is a cross-sectional view of a conventional aeration device.

(Explanation of symbols for the main parts of the drawing)

2: motor 3: oil casing

7: mechanical seal bracket (fixed block)

8 vane car 9: suction casing (device casing)

10: discharge casing (device casing)

11: supply pipe 13: rotating shaft (motor rotating shaft)

16: Euro 36: hub (rotary body)

37: wing 60: L-shaped gap (distribution gap)

61: hub top face 62: side

63: first facing surface 64: second facing surface

65: first gap 66: second gap

67 step difference

In order to achieve the above object, the present invention is to provide a horizontal gap and a vertical gap between the mechanical seal bracket and the rotating body. In addition, as the vanes rotate, a flow of fluid from the inside of the rotating body to the outside is generated in the gap between the mechanical seal bracket and the rotating body.

Specifically, the first invention includes a motor having a motor rotating shaft, a substantially cylindrical rotating body mounted on the motor rotating shaft and extending in parallel with the axial direction of the motor rotating shaft so as to cover the outer circumferential portion of the motor rotating shaft, and the rotating body. A vane having wings mounted on its outer circumference, a fixed block disposed opposite to the rotary body at one end of the rotary body so as to block one end in the axial direction of the rotary body, and suctioned by rotation of the vane An aeration device including an apparatus casing for partitioning a flow path for stirring and mixing a liquid to be processed with a predetermined gas, wherein at least one of the fixed block or the rotating body has a longitudinal section between the fixed block and the rotating body. It is assumed that a stepped portion that forms this L-shaped gap is provided.

According to the first invention, the treatment liquid around the rotating body is subjected to centrifugal force, that is, radially spread from the rotating body as the vanes rotate. Between the fixed block and the rotating body, a longitudinal section (cross section parallel to the axial direction of the rotating body) has an L-shaped gap, that is, a gap leading in the direction orthogonal to the axial direction of the rotating body (hereinafter referred to as the first clearance), and the rotating body Since gaps (hereinafter referred to as second gaps) that extend in the axial direction and parallel direction of the gaps are provided, pressure differentials in which the fluid inside the rotating body flows out on both sides of these first gaps and the second gaps occur. As a result, the fluid inside the rotating body flows out of the rotating body through the first gap and the second gap, thereby preventing foreign matter from entering the inside of the rotating body through these gaps. In addition, since the first gap and the second gap are orthogonal to each other, foreign matter is difficult to invade even in the structure of the gap. Therefore, entanglement of foreign matter on the motor shaft is prevented, and reduction of the load on the motor and improvement of the reliability of the device are achieved.

2nd invention in the said 1st invention WHEREIN: The axial clearance between a fixed block and a rotating body is set to 0.5 mm-2 mm, and the radial clearance between this fixed block and this rotating body is 0.2 mm-2 mm. It has been set.

If the gap between the fixed block and the rotating body is too large, the foreign matter is likely to enter the rotating body. On the other hand, if the gap is too small, there is a fear that the fixed block and the rotating body contact and wear or damage. Thus, according to the second invention, it is possible to form an L-shaped gap suitable for preventing the intrusion of foreign matter while preventing contact between the fixed block and the rotating body.

A third invention includes a motor having a motor rotation shaft, a cylindrical rotation body mounted in the motor rotation shaft and covering the outer circumference of the motor rotation shaft, and a cylindrical rotation body running parallel to the axial direction of the motor rotation shaft, and provided on the outer circumference of the rotation body. An impeller with wings, a fixed block disposed opposite to the rotary body at one end of the rotary body so as to block one end in the axial direction of the rotary body, and a liquid to be sucked by the rotation of the vane An aeration device having an apparatus casing for partitioning a flow path for stirring and mixing with a predetermined gas, wherein the liquid inside the rotating body is externally formed by the rotation of the rotating body between the fixed block and the rotating body. It is assumed that a flow gap is formed to flow out toward the gas.

According to the third invention, since the fluid inside the rotating body flows out of the rotating body through the flow gap, foreign matter is prevented from entering the inside from the outside of the rotating body through these gaps. Therefore, tangling of foreign matter on the motor shaft is prevented, and reduction of the load of the motor and improvement of the reliability of the device are achieved.

The above and other objects and features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings.

(Example)

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the aeration device 20 is a so-called underwater mechanical aeration device, which sucks the to-be-processed liquid from the upper side by rotating the vane 8 connected to the rotating shaft 13 of the motor 2, The air supplied through (11) and the target liquid are stirred and mixed to discharge them from the jet port 15 below.

Configuration of aeration device

First, the configuration of the aeration device 20 will be described. The apparatus casing B of the aeration apparatus 20 is comprised by attaching and fixing the suction casing 9 on the discharge casing 10. The suction casing 9 is formed in a substantially cylindrical shape, and spreads toward the upper opening in order to facilitate suction of the liquid to be processed. Around the outer periphery of the lower opening of the suction casing 9, a flange 31 serving as a connection portion with the discharge casing 10 is provided. The upper end of the discharge casing 10 is opened concentrically with the lower opening so as to be smoothly continuous with the lower opening of the suction casing 9, and a flange 32 is formed around the outer circumference thereof. And the flange 31 abuts each other with the flange 32. The suction casing 9 and the discharge casing 10 are fixed by joining these two flanges 31 and 32 with bolts (not shown). In this way, the inner surface of the device casing B is formed as a circumferential surface.

In the bottom part of the discharge casing 10, the flat part 33 provided with the insertion hole 34 for the air supply pipe 11 is formed in the center. In the part around the flat part 33, the inner inclined surface 35 which inclined downward toward the outer side is formed. The discharge port 15 is formed between the inner inclined surface 35 and the inclined outer portion similarly to the inner inclined surface 35. Thus, in the apparatus casing B, the flow path 16 of the to-be-processed liquid sucked from the upper direction through the suction port 14 is discharged toward the substantially horizontal direction from the discharge port 15 by changing a flow direction. Is formed.

The air supply pipe 11 connected to the blower (not shown) as a supply source of air is connected to the flat part 33 of the discharge casing 10. The air supply pipe 11 penetrates the insertion hole 34, and the opening part protrudes upward from the lower end surface of the discharge casing 10. As shown in FIG. The opening of this air supply pipe 11 opposes the upper surface of the air chamber casing 12 which partitions the air chamber 17 and the flow path 16 at predetermined intervals. The air chamber casing 12 defines an air chamber 17. This air chamber 17 is for supplying uniformly to the flow path 16 after storing the air supplied from the air supply pipe 11 once. The side surface of the air chamber casing 12 is inclined along the inner inclined surface 35 of the discharge casing 10. The lower end of the air chamber casing 12 is provided with a supply path 18 for supplying air in the air chamber 17 to the liquid to be processed in the flow path 16 to be stirred and mixed. Here, this air chamber casing 12 functions as a diffuser which directs the to-be-processed liquid toward the jet port 15.

The upper part of the apparatus casing B is provided with the main-body part A which gives the driving force to attract and stir the to-be-processed liquid. The main body portion A includes the motor casing 1, the motor 2 housed in the motor casing 1, the rotation shaft 13 of the motor 2, the oil casing 3, the mechanical seal bracket 7 and the vanes. The car 8 etc. are combined and comprised.

The motor casing 1 is formed in the substantially cylindrical shape which closed the upper side, and the motor chamber 40 is partitioned in the inside.

The motor 2 has a cylindrical stator 2a fixed to the inner wall of the motor casing 1, and a rotor 2b concentrically arranged with the stator 2a inside the stator 2a. ). On the inner circumferential surface of the rotor 2b, a rotating shaft 13 extending downward is fixed. The rotating shaft 13 is supported so that rotation is free by the upper shaft support (not shown) and the lower shaft support 4 accommodated in the upper part of the oil casing 3.

The rotating shaft 13 penetrates through the center part of the oil casing 3 which partitions the oil chamber 25. The lower stem support 4 supporting the rotating shaft 13 is held in the stepped portion of the oil casing 3. The lower end of the oil casing 3 outer periphery 21 is fixed to the outer periphery 22 of the mechanical seal bracket 7. On the other hand, the lower end of the oil casing 3 inner circumference 23 is connected to the inner circumference 24 of the mechanical seal bracket 7 via the mechanical seal 6. As a result, by the oil casing 3 and the mechanical seal bracket 7, the oil chamber 25 which supplies oil as a lubricant to the mechanical seal 6 which is the shaft seal of the rotating shaft 13 is partitioned. Moreover, the motor chamber 40 is sealed by the oil casing 3, and the to-be-processed liquid does not intrude into the motor chamber 40 by this.

The motor casing 1 and the oil casing 3 are fixed by bolts (not shown). Therefore, the oil casing 3 supports the motor casing 1 and supports the rotation of the rotary shaft 13 freely through the lower shaft support 4.

An impeller 8 is coupled to the distal end of the rotation shaft 13. The vane 8 is composed of a substantially cylindrical hub 36 extending in parallel with the rotating shaft 13 and a plurality of vanes 37 provided to protrude from the outer circumferential surface of the hub 36. The hub 36 is provided with a rotating shaft mounting arm 36a extending toward the center portion thereof. The rotating shaft 13 is fitted into the mounting hole of this mounting arm 36a and is fixed. As a result, the vanes 8 rotate in accordance with the rotation of the rotary shaft 13 to generate a suction force for drawing the liquid to be processed from the top to the bottom.

The main body portion A and the device casing B are fixed via the mounting arm 5.

As enlarged in FIG. 2, the upper edge of the hub 36 protrudes toward the mechanical seal bracket 7. On the outer circumferential side of the mechanical seal bracket 7, an L-shaped stepped section 67 is formed to correspond to the upper edge of the hub 36. The hub upper surface 61 of the upper edge of the hub 36 is formed in a horizontal plane, and extends in the horizontal direction between the first upper surface 63 of the mechanical seal bracket 7 facing the hub upper surface 61. The first gap 65 is formed. The mechanical seal bracket 7 is provided with a second opposing face 64 perpendicular to the first opposing face 63 and facing the side face 62 of the upper edge of the hub 36. A second gap 66 extending in the vertical direction is formed between the second opposing surface 64 and the side surface 62 of the upper edge of the hub 36. Therefore, the clearances 65 and 66 are provided between the mechanical seal bracket 7 and the hub 36 in two horizontal and vertical directions. As a result, an L-shaped gap 60 is formed in the longitudinal section (cross section parallel to the axial direction of the hub 36).

Each space | interval of the 1st clearance 65 and the 2nd clearance 66 should just be large so that the hub 36 and the mechanical seal bracket 7 may not contact, and sufficient entry | blocking invasion of the foreign material into the hub 36 may be sufficient. It can set suitably according to the capacity | capacitance of the motor 2, the dimension, shape, etc. of the vane 8 so that it may become possible. For example, by setting the first gap 65 to 0.5 mm to 2 mm and the second gap 66 to 0.2 mm to 2 mm, a suitable gap gap can be obtained. In this embodiment, the first gap 65 is set to 1 mm, and the second gap 66 is set to 0.5 mm.

Operation of the aeration device

When the aeration device 20 is operated, the motor 2 is driven, and the vanes 8 rotate in accordance with the rotation of the rotary shaft 13. By the rotation of this vane 8, the to-be-processed liquid is sucked downward at an angle with respect to the flow path 16 through the suction port 14. On the other hand, the air supplied from the blower (not shown) through the air supply pipe 11 is discharged into the air chamber 17, and then supplied to the processing liquid in the flow path 16 through the supply path 18 and mixed with stirring. The mixed liquid including bubbles is discharged from the discharge port 15 in the substantially horizontal direction through the flow path 16 while changing the flow direction in the horizontal direction.

At this time, as the vanes 8 rotate, the to-be-processed liquid near the outer peripheral surface of the hub 36 receives centrifugal force flowing toward the outside of the hub 36. For this reason, in the 1st clearance gap 65 which runs in the horizontal direction which is an action direction of a centrifugal force, a to-be-processed liquid will receive the suction force of the direction from the inner side of the hub 36 to an outer side. On the other hand, since the second clearance 66 extending in the vertical direction is provided next to the first clearance 65, the suction force in the first clearance 65 is transmitted to the second clearance 66 to be treated inside the hub 36. The liquid is sucked into the second gap 66. In particular, since the liquid to be processed easily collects near the inner circumferential surface of the hub 36 by the centrifugal force inside the hub 36, the liquid to be processed near the inner circumferential surface of the hub 36 moves upward along the inner circumferential surface to form a second gap 66. Easy to break into As a result, a flow of the processing liquid flowing out from the inside of the hub 36 through the second gap 66 and the first gap 65 is formed, and these gaps 65 and 66 are used to distribute the processing liquid. Becomes.

Effect of the Example

Therefore, according to the aeration device 20, a flow is formed in the L-shaped gap 60 between the hub 36 and the mechanical seal bracket 7 from the inside of the hub 36 to the outside, so that it is included in the liquid to be treated. Foreign matter does not flow from the outside of the hub 36 to the inside. In addition, structurally, the gap 60 has a L-shaped cross section, so that foreign matters such as hair are difficult to invade. Therefore, foreign matters are entangled in the rotary shaft 13 or foreign matter is less likely to be blocked in the mounting portion of the rotary shaft 13. Therefore, foreign matters do not cause the load of the motor 2 to be excessive, and the operation efficiency of the apparatus is not lowered. Moreover, the lifespan of the rotating shaft 13 and the motor 2 is long, and the reliability of an apparatus improves.

And even if foreign matter penetrates between the hub 36 and the mechanical seal bracket 7, the foreign material is conveyed to the outside of the hub 36 by the flow, so that the wear of the hub 36 or the mechanical seal bracket 7 Breakage is prevented.

Modification example

Here, the gap shape between the hub 36 and the mechanical seal bracket 7 is not limited to the L-shape of one end, but may be a L-shape of several steps (in other words, stepped).

The direction of the 1st clearance 65 and the 2nd clearance 66 is not limited to a horizontal direction and a vertical direction, It can change suitably according to the axial direction of the vane 8.

In the above embodiment, the vane 8 is directly connected to the motor 2, but a speed reducer may be provided between the motor 2 and the vane 8.

The gas to be supplied to the liquid to be treated is not limited to air, but may be another gas, for example, another oxygen-containing gas.

As described above, according to the present invention, the fluid inside the rotating body flows out of the rotating body through the gap between the fixing block and the rotating body, thereby preventing foreign matter from entering into the rotating body. In particular, in the first invention, since two gaps are formed orthogonal to each other between the fixed block and the rotating body, there is little possibility that foreign matter may enter the rotating body structurally.

Therefore, entanglement of foreign substances on the motor shaft can be prevented, and the operation efficiency and the reliability can be improved.

In addition, even if foreign matter enters between the fixed block and the rotating body, the foreign material is conveyed to the outside of the rotating body by the fluid flowing through the gap, so that foreign matter is blocked for a long time between the fixed block and the rotating body. There is nothing going on. Therefore, it is possible to reliably prevent abrasion or breakage of the fixing block and the van, so that the reliability of the device can be improved.

Claims (3)

A motor having a motor axis of rotation, A vane having a cylindrical rotary body mounted on the motor rotary shaft and extending in parallel with the axial direction of the motor rotary shaft so as to cover the outer peripheral portion of the motor rotary shaft, and a vane provided on the outer peripheral portion of the rotary body; A fixed block disposed at one end of the rotating body so as to prevent one end of the rotating body in the axial direction from facing the rotating body in a non-contact state; An aeration device comprising an apparatus casing for forming a flow path for discharging the to-be-processed liquid sucked by the rotation of the vane by stirring and mixing with a predetermined gas, An aeration device having at least one of the fixed block or the rotating body with a stepped portion formed between the fixed block and the rotating body with a longitudinal cross section forming an L-shaped gap. The method of claim 1, The axial clearance between the fixed block and the rotating body is set to 0.5 mm to 2 mm, The aeration gap between this fixed block and this rotating body is set to 0.2 mm-2 mm, The aeration apparatus characterized by the above-mentioned. A motor having a motor axis of rotation, A vane having a cylindrical rotating body mounted in the motor rotating shaft and extending in parallel with the axial direction of the motor rotating shaft so as to cover the outer circumferential portion of the motor rotating shaft; A fixed block disposed at one end of the rotating body so as to prevent one end of the rotating body in the axial direction from facing the rotating body in a non-contact state; An aeration device comprising an apparatus casing for forming a flow path for discharging the to-be-processed liquid sucked by the rotation of the vane by stirring and mixing with a predetermined gas, An aeration device is formed between the fixed block and the rotating body, a flow gap for flowing out the liquid inside the rotating body toward the outside by the rotation of the rotating body.