JP4732427B2 - Vertical axis stirrer - Google Patents

Description

  The present invention relates to a vertical stirrer.

Conventionally, as a vertical axis type aeration apparatus, a vertical axis provided with an impeller that extends in the vertical direction and is a stirring blade at the lower end, an impeller rotation motor that rotationally drives the vertical axis, these impeller rotation motors, A lifting motor that lifts and lowers the shaft and the impeller together, and in a state where the impeller is immersed in the water to be treated, the impeller rotating motor is driven to rotate the vertical axis and the impeller so that the water to be treated is aerated. While agitating, the vertical axis aeration device that drives the raising / lowering motor according to the fluctuation of the processing load, moves the impeller rotation motor, the vertical axis and the impeller together, and drives the impeller at a desired water depth. Is known (see, for example, Patent Document 1).
JP-A-11-290885

  However, cost reduction is desired in the above apparatus.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a vertical stirrer such as a vertical aerator capable of reducing the cost.

The vertical stirrer according to the present invention is a vertical stirrer in which the impeller provided on the vertical axis stirs the water to be treated by immersing and rotating in the water to be treated. There each row stirring, the elevation of the impeller by, the vertical axis, a fixed vertical axis rotational driving force of the driving source is transmitted, while being capable and can vertically move synchronously rotated with respect to the fixed vertical axis first A moving vertical axis having one screwing portion, and a second screwing portion screwed with the first screwing portion with respect to the vertical axis, and screwing of these screwing portions. A support member for supporting the impeller in the vertical direction is provided, and the first and second screwed portions can be synchronously rotated during stirring by the rotation of the impeller, while the support member is rotated when the impeller is raised and lowered. Means for restraining, and the drive source is operated when the impeller is raised or lowered. Than during agitation by rotation, it is characterized in that rotating slow vertical axis.

  According to such a vertical stirrer, each of the stirring by the rotation of the impeller and the raising / lowering of the impeller is performed by one drive source. For this reason, the drive source is shared, and the cost can be reduced.

The rotation driving force of the driving source is fixed the vertical axis, the impeller is transmitted to the impeller through the mobile vertical shaft rotates. Here, at the time of agitation, the moving vertical axis and the support member screwed to the vertical axis rotate synchronously, and agitation is performed by rotation of the impeller. In addition, when moving up and down, the rotation of the support member is constrained, and the moving vertical axis of rotation rotates according to the screwing of the first screwing portion of the moving vertical axis and the second screwing portion of the supporting member. And the support member is raised and lowered.
Here, at the time of stirring by the rotation of the impeller, the first and second screwing portions can be rotated synchronously, while the means for restricting the rotation of the support member at the time of raising and lowering the impeller is an electromagnetic brake. Can be mentioned.

  Thus, according to the present invention, it is possible to reduce the cost of the vertical stirrer.

  Hereinafter, a preferred embodiment of a vertical stirrer according to the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a front view showing a vertical axis aeration apparatus according to an embodiment of the present invention, FIG. 2 is a view taken along arrow II-II in FIG. 1, and the vertical axis aeration apparatus according to the present embodiment is For example, it is used in an oxidation ditch that nitrifies and denitrifies treated water such as sewage in a circulation channel.

  As shown in FIG. 1, a vertical axis aeration apparatus 100 generally includes a drive source (electric motor) 1 and a vertical axis that extends in the vertical direction and includes an impeller 2 at a lower portion to transmit the rotational driving force of the drive source 1. 3 and an elevating device 4 that supports the vertical axis 3 and that can move up and down, and the impeller 2 is immersed in the water to be treated W and rotates so that the water to be treated W is agitated.

  The drive source 1 is installed on the casing 5 in a vertical shape, and can be operated at a predetermined speed (high speed, low speed, fine speed). And the upper part of the vertical axis | shaft 3 is being fixed via the coupling 6 with respect to the output shaft 1a of this drive source 1. FIG. The joint 6 transmits the rotational driving force of the driving source 1 to the vertical axis 3 and does not support the load on the vertical axis 3. Instead of the joint 6, the upper part of a fixed vertical axis 3X described later may be directly fixed to the output shaft 1a.

  The vertical axis 3 has a double-axis structure, has a hollow cylindrical shape, a fixed vertical axis 3X to which the rotational driving force of the drive source 1 is transmitted, and a columnar movement vertical axis inserted in the fixed vertical axis 3X. 3Y.

  The fixed vertical axis 3 </ b> X is supported by vertical bearings 7, 7 attached to the casing 5 so that the fixed vertical axis 3 </ b> X is rotatable and immovable in the vertical direction (axial direction). That is, the bearing 7 supports the load of the fixed longitudinal axis 3X.

  The moving vertical axis 3Y has a key 3a on its upper outer peripheral surface, and this key 3a is slidable in a sliding groove (not shown) provided in the vertical direction on the inner peripheral surface of the fixed vertical axis 3X. It is said that it has entered the state. That is, the movement vertical axis 3Y can be rotated synchronously with respect to the fixed vertical axis 3X and can be moved in the vertical direction.

  A male screw (first screwing portion) 3b is formed on the outer peripheral surface of the moving vertical axis 3Y in the middle in the vertical direction so as to extend in the vertical direction. The impeller 2 is provided at the lower end of the moving vertical axis 3Y.

  The elevating device 4 allows the rotation of the moving vertical axis 3Y and raises and lowers the moving vertical axis 3Y as necessary. In general, the lifting device 4X and the rotation nut 4X are allowed or restrained from rotating. And an electromagnetic brake 4Y.

  The lift nut 4X is formed in a cylindrical shape, and has a female screw (second screwing portion) 4b that is screwed to the male screw 3b of the moving vertical axis 3Y on the inner peripheral surface thereof. The lift nut 4X is supported at its upper and lower positions by upper and lower bearings 8 and 8 attached to the casing 5 so as to be rotatable and immovable in the vertical direction.

  That is, the lift nut 4X functions as a support member that supports the moving vertical axis 3Y in the vertical direction by screwing the screwing portions 3b and 4b, and the bearing 8 is connected to the moving vertical axis 3Y and the impeller 2 via the lift nut 4X. Supports the load.

  A large gear 9 is fixed coaxially to the lift nut 4 </ b> X, and a small gear 10 is provided so as to mesh with the large gear 9. The shaft 10a of the small gear 10 is supported by the upper and lower bearings 11 and 11 attached to the casing 5 so that the shaft 10a can rotate and cannot move in the vertical direction.

  The electromagnetic brake 4Y is provided to act on the shaft 10a of the small gear 10. The electromagnetic brake 4Y is turned off when the impeller 2 is agitated to allow the shaft 10a to rotate, and is turned on when the impeller 2 is raised and lowered to restrain the rotation of the shaft 10a.

  As shown in FIG. 2, the casing 5 is arranged coaxially with the moving longitudinal axis 3Y, the lift nut 4X, the large gear 9 and the like, and has a large cylindrical shape that accommodates these and the small gear 10. Yes.

  According to the vertical axis type aeration apparatus 100 having such a configuration, the electromagnetic brake 4Y is first turned on and the shaft 10a is rotated regardless of whether the anaerobic state is formed or the aerobic state is formed. Thus, the rotation of the small gear 10, the large gear 9, and the lift nut 4X is constrained. In this state, the drive source 1 is driven and the vertical axis 3 (the fixed vertical axis 3X and the moving vertical axis 3Y) rotates. .

  In this way, in the state where the rotation of the lift nut 4X having the female screw 4b is constrained (rotated), the moving vertical axis 3Y provided with the male screw 3b that engages with the female screw 4b rotates, so that the movement The vertical axis 3Y and the impeller 2 can be raised and lowered.

  When the anaerobic state is formed, the moving vertical axis 3Y is moved up and down so that the impeller 2 is submerged (see the phantom line in FIG. 1).

  On the other hand, when the aerobic state is formed, the moving vertical axis 3Y is moved up and down so that the impeller 2 is positioned at the standard position (see the solid line in FIG. 1).

  When the moving vertical axis 3Y moves up and down, the vertical axis 3 is rotated at a very low speed by the drive source 1. This is because when the moving vertical axis 3Y is moved up and down, if it rotates at a high speed or a low speed faster than the fine speed, the surface pressure on the key 3a that is connected to the fixed vertical axis 3X so as to be able to rotate synchronously and slides in the vertical direction increases. This is because the force acting on the female screw 4b of the nut 4X increases. When the vertical axis 3 is rotated at a slow speed when the moving vertical axis 3Y is moved up and down as in this embodiment, the surface pressure against the key 3a is reduced, and the force acting on the female screw 4b of the lift nut 4X is reduced. As a result, the rigidity of the lift nut 4X and the like can be reduced, and the cost can be reduced further.

  Then, as described above, when the impeller 2 is moved up and down to a predetermined position, the electromagnetic brake 4Y is turned off to release the restraint of the shaft 10a and the rotation of the lift nut 4X is allowed to operate (restraint release state). In this state, the drive source 1 is driven, the vertical axis 3 rotates, and the moving vertical axis 3Y and the lift nut 4X screwed to the rotation rotate together and rotate synchronously.

  Here, when the anaerobic state is formed, the vertical axis 3 is rotated at a low speed, and oxygen-free and stirring necessary for denitrification by the rotation of the impeller 2 is performed.

  On the other hand, when the aerobic state is formed, the vertical axis 3 is rotated at high speed, and aeration and agitation necessary for nitrification by rotation of the impeller 2 are performed.

  The upper and lower limits of the moving vertical axis 3Y are detected by a proximity switch (not shown), a limit switch, or the like, and the vertical movement is controlled.

  Thus, in this embodiment, since each of the stirring by rotation of the impeller 2 and the raising / lowering of the impeller 2 is performed by one driving source 1, the driving source is shared, and both the mechanical equipment and the electric equipment are used. Cost reduction is achieved.

  In addition, since the drive source 1 only needs to have power to raise and lower the impeller 2 and the moving vertical axis 3Y in raising and lowering, the power can be reduced as compared with the apparatus described in Japanese Patent Laid-Open No. 11-290885. It has been.

  FIG. 3 is a view showing a vertical axis aeration apparatus according to another embodiment of the present invention, and corresponds to FIG. The vertical axis aeration apparatus 200 shown in FIG. 3 is different from the previous vertical axis aeration apparatus 100 in that it is arranged coaxially with the moving vertical axis 3Y, the lift nut 4X, the large gear 9 and the like instead of the casing 5. And a large cylindrical portion 15a having an inner diameter approaching the outer diameter of the large gear 9, and a small cylindrical portion 15b having an inner diameter approaching the outer diameter of the small gear 10 while being arranged coaxially with the small gear 10 and the like. These are the points using the rod-shaped casing 15 provided continuously.

  According to such a vertical axis type aeration apparatus 200, the casing is made smaller, lighter and smaller than the vertical axis type aeration apparatus 100, so that the cost can be further reduced.

  FIG. 4 is a front configuration diagram showing a main part of a vertical axis aeration apparatus according to still another embodiment of the present invention. In the vertical axis type aeration apparatus 300 shown in FIG. 4, the vertical axis 50 that can rotate synchronously with respect to the output shaft 1a of the drive source 1 shown in FIG. A male screw (first screwing portion) 50 b is provided on the outer peripheral surface of the vertical axis 50.

  In addition, a shaft body 51 extending in the vertical direction is disposed, and the impeller 2 is provided at the lower end portion of the shaft body 51, and in the range from the upper end of the shaft body 51 to a midway position in the axial direction downward. A female screw (second screwing portion) 51b is provided to be engaged with the male screw 50b of the shaft 50, and the impeller 2 is supported in the vertical direction with respect to the vertical axis 50 by the screwing of these screwing portions 50b and 51b. Has been. That is, the shaft body 51 functions as a support member that supports the impeller 2 in the vertical direction by screwing the screwing portions 50b and 51b. Further, a key groove 51 a extending in the axial direction is provided on the outer peripheral surface of the shaft body 51.

  On the other hand, the casing 5 is provided with an annular electromagnetic brake 52 that is supported by the casing 5 and into which the shaft body 51 is inserted. The electromagnetic brake 52 has a key 52 a that is configured to be able to advance and retract toward the axial center side and can enter the key groove 51 a of the shaft body 51.

  And in this embodiment, at the time of stirring by rotation of the impeller 2, the key 52 a is retracted and the rotation of the shaft body 51 is allowed, so that the vertical axis 50 and the shaft body 51 rotate together and the threaded portion 50 b On the other hand, when the impeller 2 moves up and down, the key 52a moves forward to enter the key groove 51a and the rotation of the shaft body 51 is restrained, so that the shaft body 51 is rotated according to the rotation of the vertical axis 50. It will move up and down.

  Even with the vertical aeration apparatus 300 configured as described above, the same effects as those of the previous vertical aeration apparatus can be obtained.

  As described above, the present invention has been specifically described based on the embodiment. However, the present invention is not limited to the above embodiment. For example, in the above embodiment, it is particularly preferable to use the aeration ditch as an aeration.・ Although application to a vertical axis aeration apparatus that performs both agitation, oxygen-free and agitation is described, it is applicable to a vertical axis agitator that performs only one of aeration / agitation or oxygen-free / agitation. is there. It can also be applied to a vertical stirrer when there is a fluctuation in water level.

It is a front lineblock diagram showing the vertical axis type aeration apparatus concerning one embodiment of the present invention. It is an II-II arrow line view of FIG. It is a figure which shows the vertical axis | shaft type aeration apparatus which concerns on other embodiment of this invention, and is a figure corresponding to FIG. It is a front block diagram which shows the principal part of the vertical axis | shaft type aeration apparatus which concerns on further another embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Drive source, 2 ... Impeller, 3,50 ... Vertical axis, 3b, 50b ... Male screw (first screwing part), 3X ... Fixed vertical axis, 3Y ... Moving vertical axis, 4 ... Lifting device, 4b, 51b ... Female screw (second screwing portion), 4X ... Lift nut (support member), 4Y, 52 ... Electromagnetic brake, 9 ... Large gear, 10 ... Small gear, 51 ... Shaft (support member), 100, 200, 300 ... vertical axis aeration apparatus (vertical stirring apparatus), W ... treated water.

Claims (2)

In a vertical stirrer that stirs the water to be treated by impeller provided on the vertical axis immersed in the water to be treated and rotating.
By a single drive source, agitation by rotation of the impeller, have each row of lifting of the impeller,
The vertical axis is a fixed vertical axis to which the rotational driving force of the drive source is transmitted, a movable vertical axis that is synchronously rotatable with respect to the fixed vertical axis and movable in the vertical direction, and has a first threaded portion. A shaft,
With respect to the vertical axis, a support member is provided that has a second screwing portion that is screwed with the first screwing portion and supports the impeller in the vertical direction by screwing these screwing portions. ,
During stirring by rotation of the impeller, the first and second screwing portions can be synchronously rotated, and when the impeller is raised and lowered, there is means for restraining rotation of the support member,
The vertical drive type agitator according to claim 1, wherein the drive source rotates the vertical axis slower when the impeller moves up and down than when the impeller rotates . The first and second screwed portions can be rotated synchronously during agitation due to the rotation of the impeller, while the means for restricting the rotation of the support member is an electromagnetic brake when the impeller is raised and lowered. The vertical axis | shaft type stirring apparatus of Claim 1 characterized by these.

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