JPH078023Y2 - Liquid tank agitator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a stirring device for a liquid tank, and more particularly to a stirring device for a liquid tank in which stirring by a stirring blade is improved.

[Conventional technology]

13 and 14 show a chemical liquid tank equipped with a conventional stirring device.
FIG. 10 is a side view and a plan view of 10. The chemical liquid tank 10 has a rectangular horizontal cross section, and the stirring blade 114 is one of the chemical liquid tank 10.
It is arranged at the center of the lower part of the two vertical side walls and agitates the chemical liquid 12 in the chemical liquid tank 10. C and D indicate liquid flows with large and small flow rates, respectively. Since the orientation of the conventional stirring blade 114 is fixed, the liquid flow in the chemical liquid tank 10 is constant and almost unchanged during the rotation of the stirring blade 114.

[Problems to be solved by the device]

That is, in the vertical cross section of the chemical liquid tank 10 (Fig. 13), a liquid flow having a large flow velocity C that circulates along the wall of the chemical liquid tank 10 is generated, and a liquid flow having a small flow velocity D that also circulates inside thereof is generated. . Therefore, when the convex portion 106 and the concave portion 108 are present at the bottom of the chemical liquid tank 10, the stirring is insufficient in the downstream side of the convex portion 106 and the concave portion 108, and the solid medicine 116 remains without being dissolved.

Further, in the horizontal cross section of the chemical liquid tank 10 (FIG. 14), a liquid flow having a high flow velocity C is generated in the center of the chemical liquid tank 10, and the flow velocity is D on the left and right sides thereof. Therefore, at each corner of the chemical liquid tank 10, the stirring is insufficient and the solid medicine 116 remains without being dissolved.

An object of the invention of claim 1 is to reduce a blind spot of stirring in a stirring device which stirs a liquid in a liquid tank by a stirring blade.

The object of the invention of claim 2 is to suppress the bubbling when the liquid level is lowered in achieving the object of the invention of claim 1.

[Means for Solving the Problems]

The invention will be described using the reference numerals of the drawings corresponding to the embodiments.

In the stirrer for a liquid tank (10) according to claim 1, the stirring blade (20) is arranged in the liquid tank (10) to stir the liquid (12) in the liquid tank (10). . Based on this, the stirring device of the liquid tank (10) according to claim 1 has a movement means (16) for moving the rotation axis of the stirring blade (20) so that the orientation of the stirring blade (20) changes. It becomes.

The agitation device for a liquid tank (10) according to claim 2 further causes the agitation blade (20) to face downward to stop the movement means (16) when the level of the liquid (12) in the liquid tank (10) decreases. It comprises a movement stopping means (25, 64, 86).

[Action]

In the invention of claim 1, the movement means (16) moves the rotation axis of the stirring blade (20). As a result, the stirring blade (20) rotates while changing its direction and sends a swirling flow forward. Thus, the swirling flow of the liquid (12) in the liquid tank (10) proceeds in various directions and reaches every corner of the liquid tank (10) to stir the liquid (12).

In the invention of claim 2, the liquid (12) in the liquid tank (10)
When the level of (1) decreases, the motion stopping means (25, 64, 86) actuate, the motion means (16) stops, and the stirring blade (20) faces downward. Therefore, the swirling flow of the liquid (12) generated by the rotation of the stirring blade (20) is
It does not go to the upper surface of 2), but to the bottom of the liquid tank (10).

〔Example〕

The invention will be described below with reference to the embodiments shown in FIGS.

FIG. 1 is a vertical sectional view of a chemical liquid tank 10 equipped with a stirring device. The chemical liquid tank 10 stores the chemical liquid 12 therein.
The penetrating portion 14 is provided in the lower portion of the vertical side wall of the chemical liquid tank 10,
The tubular outer shaft 16 penetrates the penetrating portion 14 and the chemical liquid tank 10
And extends inward and outward, and is bent at a predetermined obtuse angle in the chemical liquid tank 10. The inner shaft 18 projects from the tip of the outer shaft 16 and has a stirring blade 20 integrally and rotatably attached at the tip thereof. The gear case 22 is disposed outside the chemical liquid tank 10, the outer shaft 16 and the input shaft 24 project from both sides of the gear case 22, and the input shaft 24 receives rotational power from an engine (not shown) via a belt or the like. . Float switch 25
Is the chemical solution tank 10 at a position appropriately higher than the penetration portion 14.
It is attached to the vertical side wall of and detects the presence or absence of the drug solution 12 at that height.

FIG. 2 is a sectional view showing the structure of the tip portion of the outer shaft 16. The stirring blade 20 is fitted to the tip of the inner shaft 18, and the key 26
Is inserted into the fitting portion of the inner shaft 18 and the stirring blade 20,
Both are connected so that they can rotate together. The bolt 28 is inserted into the plain washer 30 and then screwed to the inner shaft 18 to prevent the stirring blade 20 from coming off the inner shaft 18. The two ball bearings 32 are fitted between the inner circumference of the outer shaft 16 and the peripheral portion of the inner shaft 18, and are fixed in axial position by a C-shaped retaining ring 36 so that the outer shaft 16 and the inner shaft 18 are mutually connected. Rotatably supported. The seal 34 is fitted into the opening of the outer shaft 16,
It prevents the chemical liquid 12 (Fig. 1) from entering the outer shaft 16.
The flexible wire 38 that is flexible extends inside the outer shaft 16 and has a wire portion 40 and a coating 42 that covers the wire portion 40. FIG. 3 is a transverse cross-sectional view of the fitting portion between the inner shaft 18 and the wire portion 40. The wire portion 40 has a square cross section and is inserted into the hole of the square cross section of the inner shaft 18 to The wire portion 40 is integrally and rotationally connected by fitting a rectangular contour. The fitting plate 44 and the nut 46 (FIG. 2) are screwed together to clamp the flange at the tip of the coating 42, and the fitting plate 44 is axially moved by the C-shaped retaining rings 36 on the inner and outer circumferences. The position is fixed, which prevents separation of the inner shaft 18 and the tip of the coating 42.

FIG. 4 is a structural diagram of the inside of the gear case 22. Output shaft 47
Is formed integrally with the input shaft 24, is inserted into the outer shaft 16, and is in contact with the proximal end portion of the flexible wire 38.
The connection between the output shaft 47 and the proximal end of the flexible wire 38 is
The structure is the same as that of the inner shaft 18 and the tip of the flexible wire 38 shown in FIG.
The flange of the base end portion of the coating 42 is clamped by the screwing, the fitting plate 44 is fixed to the outer shaft 16 by the C-shaped retaining ring 36, and the wire portion 40 having a square cross section is a hole having a square cross section of the output shaft 47. Has been inserted into. The gear case 22 includes a box portion 58 that opens to the input shaft 24 side, and a lid portion 60 that is applied to the opening side of the box portion 58 and fixed to the box portion 58 with bolts 62. The two ball bearings 48 have their axial positions fixed by the stepped portion in the box portion 58 and the C-shaped retaining ring 36 so that the outer shaft 16 can rotate.
I support 58. The two ball bearings 50 have a lid
The position in the axial direction is fixed by a step inside the 60 and a C-shaped retaining ring 36, and the input shaft 24 is rotatably supported by the lid 60. The two ball bearings 52 are axially fixed by a C-shaped retaining ring 36 and rotatably support the outer shaft 16 and the output shaft 47. The seals 54 and 56 are respectively the penetration portion of the outer shaft 16 in the box portion 58 and the input shaft 24 in the lid portion 60.
Is disposed in the through portion of the gear case 22 and seals the inside of the gear case 22.

FIG. 5 is a view of the gear case 22 as viewed from the outer shaft 16 side. In FIGS. 4 and 5, the limit switch 64
Is fixed to the outer surface of the box portion 58 by a bolt 66 in the vicinity of the protruding portion of the outer shaft 16 from the box portion 58, and has a movable portion 70. The protrusion 68 is integrally formed on the outer periphery of the outer shaft 16, and comes into contact with the movable portion 70 as the outer shaft 16 rotates,
It is displaced and the limit switch 64 is turned on and off. The protrusion 68 is formed on the outer shaft 16 at a circumferential position where the protrusion 68 contacts the movable portion 70 when the stirring blade 20 faces downward.

FIG. 6 is a view of the planetary gear device 72 as viewed from the input shaft 24 side. In FIGS. 4 and 6, the sun gear 74 is the input shaft 24.
The three planetary gears 76, which are formed integrally with each other, are arranged at equal intervals in the circumferential direction of the planetary gear device 72, and mesh with the sun gear 74 and the ring gear 78 on the inner side and the outer side, respectively. The plurality of locking holes 84 are formed in the end surface of the ring gear 78 at equal intervals in the circumferential direction.

In FIG. 4, the ball bearing 80 is prevented from axial displacement with respect to the box portion 58 by the step portion of the box portion 58 and the C-shaped retaining ring 36, and is fixed to the ring gear 78 by the bolt 82 on the inner ring side. The box 58 is rotatably supported.

FIG. 7 is a view showing a lower portion of the lid portion 60 of FIG. In FIGS. 4 and 7, the electromagnet 86 is fitted into the lid portion 60, is fixed to the lid portion 60 by the bolt 88, and has the push rod 90 so as to project toward the locking hole 84.

In FIG. 4, the flange 92 is formed at the base end of the outer shaft 16, and the support shaft 94 extends parallel to the output shaft 47.
The ends are fixed to the flange 92 with bolts 96.

FIG. 8 shows a connecting structure of the planetary gear 76 and the support shaft 94. The ball bearing 97 is fitted between the peripheral portion of the support shaft 94 and the inner periphery of the planetary gear 76, and
The axial position is fixed by the stepped portion of 76 and the C-shaped retaining ring 36, and the planetary gear 76 and the support shaft 94 are supported so as to be rotatable relative to each other.

FIG. 9 is a structural diagram of the penetration portion 14. The collar 98 has its outer peripheral side fixed to the vertical side wall of the chemical tank 10, and the metal 100 is interposed between the inner periphery of the collar 98 and the peripheral portion of the outer shaft 16 to rotatably support the outer shaft 16. Seal 102 is metal 100
The outer shaft 16 and the metal 100
The leakage of the chemical liquid 12 from between is prevented.

FIG. 10 is a control circuit diagram of the electromagnet 86. The float switch 25 and the limit switch 64 are connected in parallel, and the electric power of the DC power supply 104 is supplied to the electromagnet 86 via the parallel connection portion of the float switch 25 and the limit switch 64.

FIGS. 11 and 12 show the stirring blade 20 in the chemical tank 10.
FIG. 3 is a view showing a liquid flow generated by the above from the upper side and the side of the chemical liquid tank 10, respectively. A indicates a swirl flow generated by the stirring blade 20, and B indicates a traveling direction of the swirl flow. The stirring blade 20 is disposed in the lower portion of the chemical liquid tank 10 and in the vicinity of one vertical side wall, and is located at the axial center of the vertical side wall. In FIG. 12, the bottom of the chemical liquid tank 10 is
The projection 106 and the recess 108 may be present instead of a simple plane.

The operation of the embodiment will be described.

When the chemical liquid 12 remains sufficiently in the chemical liquid tank 10, the float switch 25 is on. Therefore, the electromagnet 86 is supplied with a current from the DC power source 104 and is in an energized state, and the push rod 90 is projected forward, and the push rod 90 is fitted into one locking hole 84 and locked. Then
The ring gear 78 of the planetary gear unit 72 is restricted from rotating. As a result, the planetary gear 76 revolves around the sun gear 74 with the rotation of the input shaft 24, the support shaft 94 rotates about the center line of the planetary gear device 72, and the outer shaft 16 rotates. The outer shaft 16 is bent at a predetermined obtuse angle from the front end side to the base end side in the chemical liquid tank 10, and the front end side of the outer shaft 16 rotates around the center line on the base end side. As a result, the inner shaft 18 also rotates around the center line on the base end side of the outer shaft 16 in the same manner as the tip end side of the outer shaft 16, and the stirring blade 20 changes its direction up, down, left, and right. On the other hand, the rotational power of the input shaft 24 is
Is transmitted to the wire portion 40 of the flexible wire 38, and the wire portion 40 bends following the rotation of the bent outer shaft 16 and transmits the rotational power to the inner shaft 18, and the stirring blade.
20 is rotated by the rotational power from the inner shaft 18. As a result, the stirring blade 20 rotates while performing a swinging motion,
As shown in FIG. 11 and FIG. 12, a swirling flow A that advances in various directions in the vertical and horizontal directions is generated in the chemical liquid tank 10. As a result, the swirl flow A spreads to every corner of the chemical liquid tank 10 and the blind spot of stirring is suppressed from occurring.
The solid drug is prevented from settling in each corner of 10, the downstream side of the convex portion 106 and the concave portion 108.

The level of the chemical liquid 12 has dropped, and the float switch 25
If exposed from above 12, the float switch 25 is turned off.
However, since the limit switch 64 is on, the electromagnet
86 is supplied with power from the DC power supply 104 via the limit switch 64, maintains the energized state, and push rod 90
Engages in and engages with the locking hole 84 to restrain the rotation of the ring gear 78, and the outer shaft 16 still rotates the tip end side around the center line on the base end side. Then, when the stirring blade 20 reaches the downward position, the projection 68 of the outer shaft 16 comes into contact with the movable portion 70 to operate, and the limit switch 64 is turned off. As a result, the electromagnet 86 is de-energized and the push rod
90 is pulled in from the locking hole 84, the ring gear 78 is released from the constraint, and becomes free to rotate.
And the rotation of the outer shaft 16 are stopped. In this way, the stirring blade 20 is rotated while being held downward, and the swirling flow A generated by the stirring blade 20 is directed to the bottom of the chemical liquid tank 10 without going to the liquid surface of the chemical liquid 12 and Foaming on the surface is suppressed.

[Effect of device]

According to the first aspect of the invention, the stirring blade rotates while its rotation axis is displaced by the movement means, so that the advancing direction of the swirling flow of the liquid in the liquid tank changes variously, and the swirling flow in the liquid tank changes. It is possible to spread to every corner and reduce blind spots on stirring to improve the stirring effect.

According to the second aspect of the invention, when the level of the liquid in the liquid tank decreases, the movement of the stirring blade by the movement means is stopped and the stirring blade moves downward. As a result, it is possible to prevent the swirling flow by the stirring blades from being directed to the upper surface of the liquid, and to prevent the foaming of the upper surface of the liquid from becoming severe.

[Brief description of drawings]

1 to 12 relate to an embodiment of the present invention, FIG. 1 is a vertical sectional view of a chemical liquid tank equipped with a stirring device, FIG. 2 is a sectional view showing a structure of a tip end portion of an outer shaft, and FIG. Is a cross-sectional view of the fitting portion between the inner shaft and the wire portion, FIG. 4 is a structural view of the inside of the gear case, FIG. 5 is a view of the gear case as seen from the outer shaft side, and FIG. 6 is a planetary gear unit input View from the shaft side,
FIG. 7 is a view showing a lower portion of the lid portion of FIG. 4, FIG. 8 is a view showing a connecting structure of a planetary gear and a support shaft, and FIG. 9 is a penetrating portion.
14 is a structural diagram of FIG. 10, FIG. 10 is a control circuit diagram of the electromagnet, and FIGS. 11 and 12 are diagrams showing a liquid flow generated by a stirring blade in the liquid chemical tank from above and side of the liquid chemical tank, respectively. FIG. 14 and FIG. 14 are a side view and a plan view of a chemical liquid tank equipped with a conventional stirring device. 10 …… chemical liquid tank (liquid tank), 12 …… chemical liquid 12 (liquid), 16 …… outer shaft (moving means), 20 …… stirring blade,
25 …… Float switch 25 (motion stopping means), 64 …… Limit switch (motion stopping means), 86 …… electromagnet (motion stopping means).

Claims (2)

[Scope of utility model registration request] 1. A stirring device for a liquid tank (10), wherein a stirring blade (20) is arranged in the liquid tank (10) to stir the liquid (12) in the liquid tank (10). The stirring blade (20) so that the direction of the stirring blade (20) changes.
A stirrer for a liquid tank, comprising a moving means (16) for moving the rotation axis of the liquid tank. 2. The liquid (12) in the liquid tank (10)
When the level of the movement of the stirring blade (20) is lowered, the movement stopping means (25, 64,
86. The liquid tank agitator according to claim 1, further comprising: 86).