JP2003074487A - Submerged pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a submerged pump, having a wide stirring range, capable of efficiently stirring even hard sediment or the like and sucking up the same, and having high wear-resistance stirring means. SOLUTION: This submerged pump is provided with a pump part 15 having an impeller rotating shaft 12 in the center and including an impeller 13 driven in rotation by a first driving source 11a and a casing 14 for it, and the stirring means 20 communicating with the suction side of the pump part 15 and mounted on a stirring rotating shaft 19 driven in rotation by a second driving source 17a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a submersible pump having a structure capable of efficiently crushing, disturbing, sucking, and discharging earth and sand or sludge on the bottom of water.

[0002]

2. Description of the Related Art Conventionally, as a submersible pump used for removing sediment or sludge on the bottom of a water, Japanese Patent Publication No. 55-23.
The one described in Japanese Patent No. 358 is known. In this submersible pump, a cutter fan with a stirring function is provided in the lower half of the extension of the rotary shaft, and a feed blade for feeding sand and sand is provided in the upper half of the extension. With a cutter fan provided with a multi-row blade (three rows in the embodiment) arranged in a spiral shape that rotates in the same direction as the impeller shaft,
The sand and sand at the bottom of the water can be stirred, and the stirred sand and sand can be efficiently sent to the impeller chamber by the feed blade. In addition, when the rotating shaft is activated on the water and the submersible pump is lowered into the water by the structure of the two sets of rotary blades, that is, the cutter fan and the feed blade, the air stagnant in the pump is removed. It does not require time and is discharged together with the soil immediately after the start of rotation in water, so workability is high.

[0003]

However, the submersible pump described in Japanese Patent Publication No. 55-23358 has the following problems to be solved.
Since the cutter fan rotates at high speed (about 1200 rpm) because it is mounted on the same shaft as the impeller rotating shaft, it has to be small in size in order to limit the power consumed by the cutter fan. First of all, there was a drawback that the stirring range was narrow. Further, when the earth and sand and the like are hard such as clay, the earth and sand and the like could not be broken down, and the effect of stirring could not be obtained. Further, since the rotation speed is high, the cutter fan wears quickly and cannot be used for a long period of time.

The present invention has been made in view of the above circumstances, and has a wide range of disturbance, and even hard earth and sand can be efficiently disturbed and sucked up, and the abrasion resistance of the disturbance means is high. The objective is to provide a submersible pump with high efficiency.

[0005]

A submersible pump according to a first aspect of the invention, which has the above-mentioned object, has an impeller rotating shaft at the center.
A pump unit including an impeller and a casing thereof that are rotationally driven by a first drive source; and a disturbing unit that is provided on a disturbing rotation shaft that communicates with a suction side of the pump unit and that is rotationally driven by a second drive source. Is equipped with. by this,
Since the impeller and the disturbing means can be independently rotated, the disturbing means can be rotated at a low speed, and as a result, a larger disturbing means can be provided, so that the disturbing effect can be obtained in a wide range. Also, it is possible to suck up the earth and sand more efficiently. Moreover, since the disturbing means rotates at a low speed, it is possible to reduce the wear rate, so that the service life can be extended.

A submersible pump according to a second aspect of the present invention, which has the above-mentioned object, has an impeller rotating shaft in the center and is provided with an impeller rotatably driven by a second drive source and a casing thereof, and a pump portion. And a disturbing means provided on a disturbing rotation shaft, which communicates with the suction side and is driven to rotate by a second drive source via a speed reduction mechanism. As a result, the impeller can be rotated at a high speed while the disturbing means can be rotated at a low speed in spite of one driving source, and as a result, a larger disturbing means can be provided. The disturbing effect extends over a wide range, and soil and the like can be sucked up more efficiently. Moreover, since the disturbing means rotates at a low speed, it is possible to reduce the wear rate, so that the service life can be extended. Further, since there is only one drive source, it can be made compact and inexpensive.

In the submersible pump of the first and second inventions,
The disturbing means may also be configured to have an earth mass crushing section with a plurality of crushing blades arranged substantially radially. As a result, it is possible to loosen a wide range of earth and sand and the like by the earth crushing section and to add water to give fluidity, and it is possible to efficiently suck even a solidified earth lump. In the submersible pumps according to the first and second inventions, the agitation means may be configured to have an agitation blade part having a plurality of blade pieces around a conical or cylindrical boss. With this, although the power is the same, stirring can be performed over a wider range than the stirring range of the conventional cutter fan, so that the efficiency of sucking up soil or the like is improved.

In the submersible pump of the first and second inventions,
The disturbing means can also be configured to have a spiral blade. As a result, the sand and sand can be efficiently sent to the pump suction port by the spiral blade, and an appropriate amount of sand and sand can be sent due to the slow rotation, so the sand and sand can be diluted with water, and the pump discharge pipe is blocked. It is possible to efficiently transport earth and sand while preventing the above. Further, it may be configured to have an earth mass crushing section provided with a plurality of crushing blades arranged substantially radially around the outer periphery of the spiral blade. As a result, the sand and the like around the spiral blade can be loosened by the crushing blade and mixed with water to improve the fluidity, while being efficiently sent to the pump suction port by the spiral blade. In the submersible pumps according to the first and second aspects of the invention, the second drive source may be a hydraulic motor. As a result, the rotation speed of the disturbance rotation shaft can be freely changed.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Next, referring to the attached drawings, an embodiment in which the present invention is embodied will be described to provide an understanding of the present invention. 1 is a front sectional view of the submersible pump according to the first embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a first embodiment of the present invention. 6 is a front view of a first modification of the submersible means of the submersible pump according to FIG. 4, FIG. 4 is a front view of a second modification of the submersible means of the same submersible pump, and FIG. 5 is a sectional view taken along the line BB in FIG. FIG. 4 is a front sectional view of a submersible pump according to a second embodiment of the present invention.

As shown in FIG. 1, a submersible pump 10 according to a first embodiment of the present invention includes a first water-tight motor section in which a first electric motor 11a, which is an example of a first drive source, is sealed. 11 and the lower end of the first watertight motor unit 11,
The first electric motor 1 having the impeller rotating shaft 12 in the center
It has an impeller 13 rotatably driven by 1a and a pump section 15 provided with its casing 14.

The submersible pump 10 further includes a pump section 15
Flow path member 1 that communicates with the suction side of the flow path and forms a flow path of the conveyed product
6, a second watertight motor section 17 that communicates with the suction side of the flow path member 16 and that seals a second electric motor 17a that is an example of a second drive source, and is directly connected to the second electric motor 17a. And a plurality of crushing blades 29 attached to the lower end of the disturbing rotary shaft 19 which is an extension of the output shaft 18a of the reducer 18 and whose intermediate part is rotatably supported by a bearing 37. And an earth mass crushing part (an example of a disturbing means) 20. These will be described in detail below.
The rotation speed of the output shafts of the first and second electric motors 11a and 17a is about 1200 rpm.

The output shaft (not shown) of the first electric motor 11a of the first watertight motor unit 11 is an impeller rotating shaft 12
And the pump portion 15 is connected to the first electric motor 1
It includes an impeller 13 that is driven to rotate by 1a, and a casing 14 that houses the impeller 13 and that forms an impeller chamber 21. The flow path member 16 includes a suction unit 23 having a suction port 22 for sucking the transported object disturbed by the soil crushing unit 20, and the sucked transported object is an impeller chamber 21.
A suction part 25 having a suction port 24 formed so as to communicate with the inside, and a connection part 2 connecting the suction part 23 and the suction part 25.
6 and 6. The suction port 22 and the suction port 24 have a circular cross section, and the connecting portion 26 has a rectangular cross section. Note that, as shown in FIG. 5, the suction port 22 is divided into four parts by a bearing holding part support member 22a radially provided from the outer peripheral surface of the bearing holding part 38.

As shown in FIG. 1, a through hole 27 through which the disturbing rotary shaft 19 penetrates is formed in the upper portion of the suction portion 23, and an O-ring or the like is formed between the through hole 27 and the disturbing rotary shaft 19. Sealing material is attached. First watertight motor unit 1
Second watertight motor unit 1 connected by a connecting member 28
The output shaft of the second electric motor 17a of No. 7 has the speed reducer 1
8 is connected to the input shaft of the output shaft 18 of the speed reducer 18.
The disturbance rotation shaft 19 is integrally connected to a. The speed reduction ratio of the speed reducer 18 is, for example, 1/10 in a two-step speed reduction structure of spur gears. Therefore, the second electric motor 1
The rotation speed 1200 rpm of the output shaft of 7a is the disturbance rotation shaft 19
Has been reduced to 120 rpm.

As shown in FIGS. 1 and 2, the disturbance rotation shaft 1
The middle portion of 9 is rotatably supported by the bearing holding portion support member 22a on the suction portion 23 of the flow path member 16 and the bearing 37 supported by the bearing holding portion 38 fixed at several positions on the outer circumference. In addition, the lower end of the disturbance rotation shaft 19, that is,
Immediately below the suction portion 23 of the flow path member 16, the disturbance rotation shaft 19 is provided.
3 steps in the axial direction at a predetermined pitch G, and 1 in plan view
A plurality of (3 in the present embodiment, 3 steps × 3 pieces / step = 9 pieces) crushing blades 2 radially attached at an equal pitch of 20 °
It has an earth mass crushing section 20 provided with 9. As shown in FIG. 2, the disturbing rotary shaft 19 to which the crushing blades 29 are attached rotates in the clockwise direction indicated by the arrow, and each crushing blade 29 is formed in an arcuate shape in plan view, and also has a suction port in the axial direction. It is formed by bending to the 22 side. A blade portion (edge portion) 30 is formed in the concave portion of the crushing blade 29 on the rotation direction side.

Therefore, in the submersible pump 10, the plurality of crushing blades 29 constituting the crushing section 20 of the earth directly contact the sand and sludge, and even if the sand and sludge are hard, they are crushed. It is possible to maintain the fluidity, thereby increasing the carrying capacity.
Further, since the clod crushing unit 20 has a lower rotation speed (120 rpm) than the conventional cutter fan, as a result, the outer dimension of the crushing blade 29 can be increased, and thus the clod can be crushed over a wider range. As a result, a larger amount of earth and sand can be sucked. Moreover, since the rotation speed is slow, the wear speed of the crushing blade 29 can be slowed down, so that the service life of the crushing blade 29 can be extended.

3 and 4 show a first modification example and a second modification example of the disturbing means, respectively. In the first modification of the disturbing means shown in FIG.
The distal end portion of the disturbing rotary shaft 19 is provided with a spiral blade 32 that conveys an object to be conveyed from the lower side to the upper side, and a plurality of crushing blades 29a that are arranged substantially radially around the outer periphery of the spiral blade 32. . The disturbing rotary shaft 19 is installed in the crushing unit 31 with spiral blades.
On the outer periphery of the spiral blade 3 along the axial direction of the disturbance rotation shaft 19.
2 is attached about 2 times (pitch), spiral blade 3
The outer side of 2 has a crushing blade 29 in a substantially radial shape.
a is a total of 6 at an equal pitch of 120 ° in the circumferential direction in plan view.
One is installed. As shown in FIG. 2 as a reference, the crushing blade 29a also has a recessed portion on the rotational direction side like the crushing blade 29, and a blade portion (edge portion) is formed in the recessed portion.

Therefore, in the crushing section 31 with a spiral blade, the earth and sand around the spiral blade 32 are crushed by a plurality of crushing blades 2.
The suction port 2 of the flow path member 16 is loosened by the spiral blade 32 while being loosened by 9a and mixed with water to improve the fluidity.
2 can be efficiently sent, and since the rotation speed is slow, it is possible to send an appropriate amount of earth and sand, etc., so that the earth and sand is diluted with water, preventing clogging in the pump discharge pipe and efficiently removing earth and sand, etc. Transport can be done. Further, since the rotation speed is slow, the wear speed of the crushing blade 29a can be slowed down, so that the service life of the crushing blade 29a can be extended.

In the disturbing blade portion 34, which is a second modified example of the disturbing means shown in FIG. 4, a large number of disturbing blades 34 are provided around the conical or cylindrical boss at the tip of the disturbing rotation shaft 19 (in the present embodiment). In FIG. 3, there are three blades 36. Therefore, in the disturbing blade portion 34, the outer shape of the blade piece 36 can be formed large by the low speed rotation (120 rpm) of the disturbing rotating shaft 19, so that the power consumption is the same, but a wider range than the stirring range of the conventional cutter fan. Since it can be disturbed over the entire area, the efficiency of sucking up soil and sand is improved.

Next, a submersible pump 10a according to a second embodiment of the present invention shown in FIG. 6 will be described. As shown in FIG. 6, the submersible pump 10a is different from the submersible pump 10 in that the impeller rotating shaft 12a and the disturbance rotating shaft (low speed rotating shaft)
It is characterized in that the rotation of 19a is performed by one drive source. The details will be described below. In addition,
The same components as those of the submersible pump 10 are designated by the same reference numerals, and the same components as those of the submersible pump 10 are designated by the same reference numerals and detailed description thereof is omitted.

As shown in FIG. 6, the submersible pump 10a is
A watertight motor portion 11b that seals an electric motor 11c, which is an example of a drive source (expressed as a second drive source in claim 2), and an impeller rotating shaft connected to an output shaft 39 of the electric motor 11c. A pump unit 15 having an impeller 13 and a casing 14 thereof which are driven to rotate by an electric motor 11c; and a reduction mechanism 40 for converting rotation of an output shaft 39 of the electric motor 11c into rotation of a disturbance rotation shaft 19a. have.

As shown in the figure, the speed reduction mechanism 40 has a two-stage speed reduction, a small gear 41 is attached to the output shaft 39 of the electric motor 11c, and the large gear 4 meshes with the small gear 41.
2 is provided on a rotary shaft 44 whose both ends are rotatably supported by bearings 43. A small gear 45 is provided directly above the large gear 42 of the rotating shaft 44, and a large gear 46 meshing with the small gear 45 is fixed to the upper end of the disturbing rotating shaft 19a. In the casing 47, the disturbing rotary shaft 19a is rotatably supported by bearings 48 above and below the large gear 46. The reduction ratio of the reduction mechanism 40 (the number of revolutions of the disturbance rotation shaft 19a / the number of rotations of the impeller rotation shaft 12a) is about 1/10. Therefore, the rotation speed of the output shaft 39 of the electric motor 11c is 1200 rpm, and the rotation speed of the disturbance rotation shaft 19a is 120 rpm, which is the same as the rotation speed of the disturbance rotation shaft 19 of the submersible pump 10. The disturbance rotation shaft 19a may have a split structure in which the casing 47 and the flow path member 16 can be connected by a coupling. As shown in FIG. 6, the input side of the casing 47 of the speed reduction mechanism 40 is
The watertight motor 11b is sandwiched between the lower surface of the watertight motor 11b and the rear surface of the casing 14 of the pump 15 to be hermetically sealed.

In the submersible pump 10a of the above-described embodiment, only the clod crushing section 20 is attached as the disturbing means, but the invention is not limited to this, and the disturbing means according to the modified example attached to the submersible pump 10 (the clod with spiral blades). The crushing section 31 and the disturbing blade section 34) can be attached. Disturbance rotation axis 19,
Although the bearing 37 is provided at an intermediate position of the bearing 19a, the bearing 37 is not limited to this.
7 can be omitted.

First electric motor 11a, electric motor 11
The rotation speed of the output shaft of c was set to about 1200 rpm, but it is not limited to this, and it is 1000, 1500 or 1800 rpm.
It is also possible to set the reduction ratio of the reduction mechanism 40 to 1
However, the present invention is not limited to this, and may be changed according to the situation. As a drive source, the electric motor 11
Although a, 11c and 17a are adopted, the invention is not limited to this.
A hydraulic motor can also be used.

Clod crushing section 20, clod crushing section 3 with spiral blades
In 1, the crushing blades 29, 29a are provided radially in a circumferential direction at equal pitches in a plan view, but the invention is not limited to this.
The crushing blades 29, 29a may be arranged at random (random) rather than at a regular pitch. Further, in the clod crushing section 20, three crushing blades 29 were provided in plan view and three stages in the axial direction, for a total of nine crushing blades 29, but the invention is not limited to this, and two or four in plan view. As described above, it is also possible to provide one, two, or four or more stages in the axial direction. Further, a plurality of them may be provided in a spiral shape in the axial direction in a plan view. Although the spiral blade 32 and the crushing blade 29a constitute the earth blade crushing portion 31 with the spiral blade, the invention is not limited to this, and only the spiral blade may be used depending on the situation. Crushing blade 29, 2
9a is formed in a concave shape on the rotational direction side, but is not limited to this and may be formed in a convex shape on the rotational direction side.

[0025]

Advantageous Effects of Invention Claim 1 and dependent claims 3 to 3
In the submersible pump described in 7, since the impeller and the disturbing means can be independently rotated, the disturbing means can be rotated at a low speed. As a result, as the disturbing means,
Since a larger one can be provided, the disturbing effect can be spread over a wide range and soil and the like can be sucked up more efficiently. Therefore, the range of disturbance is wide, and even hard soil or the like can be efficiently disturbed and sucked up.
Moreover, since the disturbing means rotates at a low speed, it is possible to reduce the wear rate, so that it is possible to provide a submersible pump having high wear resistance.

Claim 2 and claims 3 to 7 dependent on it.
In the submersible pump described, it is possible to rotate the impeller at high speed while rotating the disturbing means at low speed in spite of one driving source, and as a result, a larger disturbing means should be provided. As a result, the disturbing effect can be spread over a wide area and soil and the like can be sucked up more efficiently. Therefore, the range of disturbance is wide, and even hard soil or the like can be efficiently disturbed and sucked up. Moreover, since there is only one drive source, it can be made compact and inexpensive. Further, since the disturbing means rotates at a low speed, it is possible to reduce the wear rate, so that the service life can be extended.

Particularly, in the submersible pump according to the third aspect, it is possible to loosen a wide range of earth and sand or the like by the earth crushing portion and add water to give fluidity, and to solidify even hardened earth lumps. Since the suction can be performed efficiently, the carrying capacity is improved. In the submersible pump according to the fourth aspect, although the power is the same, stirring can be performed over a wider range than the stirring range of the conventional cutter fan, so that the suction efficiency of dirt and the like is improved, and thereby the transfer capacity is improved. In the submersible pump according to claim 5, since the sand and the like can be efficiently sent to the pump suction port by the spiral blade, and moreover, an appropriate amount of the sand and sand can be sent due to the slow rotation, so the earth and sand is diluted with water. Therefore, it is possible to efficiently transport earth and sand while preventing blockage in the pump discharge pipe. Therefore, the workability of transporting earth and sand is improved.

In the submersible pump according to the sixth aspect, the sand and the like around the spiral blade are loosened by a crushing blade, water is mixed to improve the fluidity, and the spiral blade efficiently feeds the pump suction port. As a result, the carrying capacity is improved. In the submersible pump according to claim 7, since the number of revolutions of the disturbing rotary shaft can be freely changed, the structure of the disturbing means is taken into consideration in consideration of the conditions (concentration, particle size, hardness of the clod, etc.) of the conveyed material. Optimal settings can be made according to.

[Brief description of drawings]

FIG. 1 is a front sectional view of a submersible pump according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a front view of a first modification of the disturbing means of the submersible pump according to the first embodiment of the present invention.

FIG. 4 is a front view of a second modification of the disturbing means of the submersible pump.

5 is a cross-sectional view taken along the line BB of FIG.

FIG. 6 is a front sectional view of a submersible pump according to a second embodiment of the present invention.

[Explanation of symbols]

10, 10a: Submersible pump, 11: 1st watertight motor part, 11a: 1st electric motor (1st drive source), 11
b: watertight motor section, 11c: electric motor (driving source), 1
2, 12a: Impeller rotating shaft, 13: Impeller, 14:
Casing, 15: pump part, 16: flow path member, 17:
2nd watertight motor part, 17a: 2nd electric motor (2nd
Drive source), 18: reducer, 18a: output shaft, 19, 1
9a: Disturbance rotation axis, 20: Crushing section (disturbance means), 2
1: Impeller chamber, 22: Suction port, 22a: Bearing holding part support member, 23: Suction part, 24: Suction port, 25: Suction part,
26: connecting part, 27: through hole, 28: connecting material, 29, 2
9a: crushing blade, 30: blade portion, 31: crushed soil block with spiral blade (disturbing means), 32: spiral blade, 34: disturbing blade portion (disturbing means), 36: blade piece, 37: bearing, 38: bearing Holding part, 39: Output shaft, 40: Reduction mechanism, 41: Small gear, 42: Large gear, 43: Bearing, 44: Rotating shaft, 45:
Small gear, 46: Large gear, 47: Casing, 48: Bearing

─────────────────────────────────────────────────── ─── Continued Front Page (51) Int.Cl. ⁷ Identification Code FI Theme Coat (Reference) B02C 18/06 B02C 18/06 Z 18/18 18/18 Z F04D 13/04 F04D 13/04 13/08 13/08 S 29/00 29/00 Z 29/42 29/42 E 29/70 29/70 G F term (reference) 3H022 AA01 BA03 BA07 CA06 CA48 DA04 DA13 3H034 AA03 AA20 BB01 BB06 BB12 CC05 CC07 DD02 DD20 DD28 EE04 EE11 EE18 4D065 CA06 CB10 DD04 EB03 ED27

Claims (7)

[Claims] 1. A pump unit having an impeller rotating shaft in the center, the pump unit including an impeller and a casing thereof, which is rotationally driven by a first drive source, and a second drive source communicating with a suction side of the pump unit. A submersible pump, comprising: a perturbation means provided on a perturbation rotation shaft that is rotationally driven by the submersible pump. 2. A pump unit having an impeller rotating shaft in the center, which is rotatably driven by a second driving source, and a casing thereof, and a second driving unit which communicates with a suction side of the pump unit. A submersible pump, comprising: a perturbation means provided on a perturbation rotary shaft, which is rotationally driven by a source through a speed reduction mechanism. 3. The submersible pump according to claim 1, wherein the disturbing means has an earth mass crushing section having a plurality of crushing blades arranged substantially radially. 4. The submersible pump according to claim 1, wherein the disturbing means has a disturbing vane portion having a plurality of vane pieces around a conical or cylindrical boss. 5. The submersible pump according to claim 1, wherein the disturbing means has a spiral blade. 6. The submersible pump according to claim 5, further comprising a soil blade crushing portion with spiral blades, the crushing portion having a plurality of crushing blades arranged substantially radially around the outer periphery of the spiral blade. pump. 7. The submersible pump according to claim 1, wherein the second drive source is a hydraulic motor.