Propellers and agitators that circulate wastewater in clarifiers

Abstract

The present invention relates to a propeller. The propeller is intended to be fixed in a clamping manner to a shaft having an axially extending drive profile. The propeller is made up of a number of elements (A, B, C, D), each of which has a hub part (1) with a complementary profile (2) corresponding to the drive profile. A first connection part (3) and a propeller blade (4) extending from the first connection part (3) are formed on one side of the hub part (1), and a second connection part (5) is formed on the other side of the hub part (1). The first connection part (3) is designed to connect and support the second connection part (5) of the adjacent element (A, B, C, D). When the elements (A, B, C, D) are connected in a supporting manner at their connections (3, 5), the hub parts (1) of all elements (A, B, C, D) are complementary to each other to form a hub that connects and surrounds the shaft.

Description

[Technical field]

[0001] The present invention relates to a propeller and agitator for circulating wastewater in a clarifier. [Background technology]

[0002] Propellers are generally known in the prior art. Propellers are used to circulate a fluid or the like, in particular to drive a ship. Propellers usually comprise a hub for fastening to a propeller shaft. The hub may be manufactured integrally with the propeller. In addition, propellers with adjustable propeller blades are also known. The adjustable propeller blades are fixed to the hub.

[0003] Propellers are also used in particular in what are known as hyperboloid agitators for sewage circulation. In this case, the propeller is attached to the shaft above the hyperboloid agitator. The sewage is accelerated by the propeller in the direction of the hyperboloid agitator. Such an agitator is known, for example, from WO 2009 / 018916 A1. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2009 / 018916 Summary of the Invention [Problem to be solved by the invention]

[0005] Propellers manufactured integrally with the hub take up a large volume for shipping. Apart from this, if a stirrer (e.g. a hyperboloid stirrer) is already attached at the end of the shaft, installing the propeller on this shaft can be a tedious process.

[0006] The object of the present invention is to overcome the drawbacks of the prior art. In particular, a propeller with a small transport volume is described. According to another object of the present invention, the propeller should be suitable for installation on a shaft, even if the stirring body, the propeller, etc. is already attached to the end of this shaft. Apart from this, a stirring device is described which can be installed with less effort. [Means for solving the problem]

[0007] This object is achieved by the features of claims 1 and 7. Expedited embodiments of the invention emerge from the dependent claims.

[0008] According to the invention, a propeller is proposed which is fixed by clamping to a shaft having an axially extending drive profile, The propeller is made up of multiple elements, each element having a hub portion having a mating profile corresponding to said drive profile; a first connection portion and a propeller blade extending from the first connection portion are molded on one side of the hub portion, and a second connection portion is molded on the other side of the hub portion; the first connection portion is designed to connect and support the second connection portion of an adjacent element; When the interlocking portions connect the supporting elements, the hub portions of all the elements combine to form a hub that connects and surrounds the shaft.

[0009] Due to the large number of elements, the transport volume of the proposed propeller can be reduced. The proposed propeller is furthermore particularly suitable for assembly on a shaft, even if the end of the shaft is already provided with stirring bodies, propellers, etc. The hub parts of all elements combine to form a hub that connects and surrounds the shaft, so that a coupling connection and a clamping connection with the shaft can be achieved. The first connection part is designed to connect and support the second connection part of the adjacent element. The elements or their connections are expediently designed in such a way that when installed, a narrow gap remains between the first connection part and the adjacent second connection part. Apart from the coupling connection with the shaft, the design additionally allows a friction engagement connection or a clamping connection. This connection represents an excellent level of strength.

[0010] A thin plate made of an elastic material (e.g. rubber, etc.) may be attached to the first connection part and / or the second connection part, which when installed fills the gap formed between the first connection part and the adjacent second connection part, thereby preventing thread-like contaminants from becoming trapped in this gap.

[0011] The shaft is preferably a splined shaft. Of course, it is also conceivable for the shaft to have different driving profiles extending in the axial direction. For example, the shaft may have a polygonal profile, a toothed shaft profile, a slit shaft profile, etc. In this case, the hub part may have a corresponding mating profile.

[0012] According to an advantageous embodiment, the propeller consists of at least three elements, preferably exactly four elements, which may be identical, which reduces the manufacturing costs of the propeller.

[0013] The first connection part expediently has at least two first holes, which may be formed as screw holes. The second connection part may have at least two second holes corresponding to the first holes for the passage of screws. This allows a simple and quick connection of the elements.

[0014] According to another aspect of the invention, a stirring device for circulating wastewater in a clarifier is proposed, the stirring device comprising a motor and a shaft extending from said motor with an axially extending drive profile, on which a propeller according to the invention is attached. The proposed stirring device can be installed quickly and easily. In particular, it is possible to install the propeller according to the invention even if another propeller, a hyperboloid stirrer, etc. is already attached to the end of the shaft.

[0015] Further, the shaft may conveniently be a splined shaft. The stirring device may be a hyperboloid stirrer, in which case a hyperboloid stirrer is conveniently attached to the end of the shaft depending from the motor. Such stirring devices may be particularly easily installed using a propeller according to the present invention. [Brief description of the drawings]

[0016] Exemplary embodiments of the propeller are described in more detail hereinafter with reference to the drawings, in which: [Figure 1] FIG. [Diagram 2] FIG. 2 shows an enlarged detail based on FIG. [Diagram 3] FIG. 3 is a perspective view based on FIG. 2. [Figure 4] A perspective view of two elements supporting each other. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] The propeller shown in the drawings is manufactured from a number of integrally formed elements A, B, C, and D. In the present exemplary embodiment, the propeller consists of just four elements A, B, C, and D. Elements A, B, C, and D may be identical. Hereinafter, the propeller will be described in more detail with reference to element A. The following description applies equally to the other elements B, C, and D.

[0018] Element A has a hub part 1, the inner circumference of which is provided with a mating profile 2. The mating profile 2 corresponds to the driving profile (not shown here) of a splined shaft (not shown here). A first connection part 3 extends from the hub part 1 at an angle (here at an angle of about 45 degrees). A propeller blade 4, preferably just one propeller blade 4, extends from the first connection part 3. A second connection part 5 is molded on the other side of the hub part 1. The second connection part 5 forms an angle of about 90 degrees with the first connection part 3. It is clear that the angle between the first connection part 3 and the second connection part 5 will be changed if the proposed propeller is formed not from four elements, but from three elements or from five or more elements.

[0019] The first connection part 3 has a first support surface 6 in the circumferential direction. The second connection part 5 has a second support surface 7 in the circumferential direction. The first support surface 6 and the second support surface 7 are correspondingly formed such that the first connection part 3 and the second connection part 5 can be arranged substantially interlocking and leaning against each other (see FIG. 2).

[0020] As can be seen especially from Figures 3 and 4, the first connecting part 3 has a first hole 8. The second connecting part 5 has a second hole 9. When adjacent elements A, B, C and D are arranged to support each other, the first hole 8 and the second hole 9 are arranged opposite each other such that a fixing bolt can be led through the first hole 8 and the second hole 9. In this case, the first hole 8 is expediently embodied as a screw hole.

[0021] To install the proposed propeller, all that is required is to position elements A, B, C, and D around a shaft (not shown here) and then connect them by screws. When elements A, B, C, and D are connected, their hub parts combine to form a hub, which couples and engages with the drive profile 2 of the shaft by means of a mating profile 2. Apart from this, elements A, B, C, and D are formed such that when connected, they surround the shaft in a frictional engagement manner or in a clamping manner.

[0022] The propeller according to the invention can be relatively easily installed, in particular on a shaft at whose end a hyperboloid stirrer is attached - see, for example, in this respect, WO 2009 / 018916 A1, WO 2006 / 108538 A1 and DE 298 03 497 U1. The present invention includes the following embodiments. [Aspect 1] A propeller fixed by clamping to a shaft having an axially extending drive profile, The propeller is made up of a number of elements (A, B, C, D), Each element (A, B, C, D) has a hub portion (1) having a mating profile (2) corresponding to said drive profile; a first connection portion (3) and a propeller blade (4) extending from the first connection portion (3) are molded on one side of the hub portion (1), and a second connection portion (5) is molded on the other side of the hub portion (1); the first connection parts (3) are designed to connect and support the second connection parts (5) of adjacent elements (A, B, C, D); When the supporting elements (A, B, C, D) are connected by the connecting portions (3, 5), the hub portions (1) of all the elements (A, B, C, D) combine to form a hub that connects and surrounds the shaft. A propeller. [Aspect 2] 2. The propeller of claim 1, wherein the shaft is a splined shaft. [Aspect 3] 3. The propeller according to claim 1 or 2, wherein the propeller consists of at least three elements (A, B, C, D), preferably exactly four elements (A, B, C, D). [Aspect 4] The propeller according to any one of aspects 1 to 3, wherein the first connection portion (3) has at least two first holes (8). [Aspect 5] The propeller according to any one of aspects 1 to 4, wherein the first hole (8) is formed as a screw hole. [Aspect 6] A propeller according to any one of aspects 1 to 5, wherein the second connection portion (5) has at least two second holes (9) corresponding to the first holes (8) for the passage of screws. [Aspect 7] An agitation device for circulating wastewater in a clarifier, comprising: A motor, a shaft extending from the motor having an axially extending drive profile; A stirring device, comprising the propeller according to any one of the first to sixth aspects attached to the shaft. [Aspect 8] 8. The mixing device of claim 7, wherein the shaft is a splined shaft. [Aspect 9] 9. The stirring apparatus of claim 7 or 8, wherein a hyperboloid stirrer is attached to an end of the shaft that depends from the motor. [Explanation of symbols]

[0023] 1 Hub section 2. Mating Outline 3 First connection part 4 Propeller blades 5 Second connection part 6 1st support surface 7 Second support surface 8 Hole 1 9 Hole 2 A, B, C, D elements

Claims

1. A propeller fixed by clamping to a shaft having an axially extending drive profile, The propeller is made up of at least three elements (A, B, C, D), Each element (A, B, C, D) has a hub portion (1) having a mating profile (2) corresponding to said drive profile; A first connection portion (3) and a propeller blade (4) extending from the first connection portion (3) are molded on one side of the hub portion (1), and a second connection portion (5) is molded on the other side of the hub portion (1); said first connection parts (3) are designed to connect and support said second connection parts (5) of adjacent said elements (A, B, C, D); a propeller, wherein when the supporting elements (A, B, C, D) are connected by the connecting parts (3, 5), the hub parts (1) of all the elements (A, B, C, D) combine to form a hub that connects and surrounds the shaft, A propeller, characterized in that the first connection part (3) has at least two first holes (8).

2. 2. The propeller of claim 1, wherein said shaft is a splined shaft.

3. A propeller according to claim 1 or 2, wherein the propeller consists of exactly four elements (A, B, C, D).

4. A propeller according to any one of the preceding claims, wherein the first holes (8) are formed as threaded holes.

5. A propeller according to any one of the preceding claims, wherein the second connection part (5) has at least two second holes (9) corresponding to the first holes (8) for the passage of screws.

6. An agitation device for circulating wastewater in a clarifier, comprising: A motor, a shaft extending from the motor having an axially extending drive profile; A stirring device, comprising a propeller according to any one of claims 1 to 5 attached to the shaft.

7. 7. The stirring apparatus of claim 6, wherein a hyperboloid stirrer is attached to an end of the shaft that extends depending from the motor.

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