JP3591711B2 - Elbow with transmission and vertical pump - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an elbow with a transmission that is easy to install. The present invention also relates to a vertical shaft pump using a transmission-equipped elbow which can be easily installed.
[0002]
[Prior art]
As an example of a vertical shaft pump whose installation height can be reduced, the present applicant has proposed a technique disclosed in Japanese Patent Application Laid-Open No. H11-193799. The technique proposed earlier will be briefly described with reference to FIGS. FIG. 3 is an overall structural view of the previously proposed vertical shaft pump. FIG. 4 is a longitudinal sectional view of the discharge elbow with a reduction gear proposed earlier.
[0003]
First, in the overall structure of the vertical shaft pump shown in FIG. 3, a pump pipe 14, an impeller casing 16 and a suction bell 18 are integrally suspended from a floor 10 in a suction water tank 12. Then, the discharge elbow 20 is assembled by being stacked on the pumping pipe 14. A rotary shaft 30 is rotatably mounted on the pumping pipe 14, and is disposed so as to protrude through the outer wall of the discharge elbow 20. A reduction gear 22 is integrally assembled with the discharge elbow 20, and an input shaft 24 of the discharge elbow 20 projects in a substantially horizontal direction to a side opposite to the discharge. The input shaft 24 is drivingly connected to a driving device 26 provided on the floor 10. In FIG. 3, reference numeral 28 denotes a space provided at the joint between the discharge elbow 20 and the speed reducer 22, and the rotation shaft 30 of the vertical pump penetrates the space 28.
[0004]
Further, in the structure of the discharge elbow 20 to which the speed reduction device 22 shown in FIG. 4 is assembled, a part of the casing 32 of the speed reduction device 22 is integrally formed on the upper outer wall of the discharge elbow 20. The casing 32 is provided with a partition wall 34 through which the rotating shaft 30 penetrates above the outer wall of the discharge elbow 20. A space 28 is formed by being surrounded by the casing 32 including the partition wall 34 and the outer wall of the discharge elbow 20. Is done. Further, the space 28 is communicated with the outside at the side, and the fluid leached from the gland packing or the like of the rotating shaft 30 is discharged to the outside. A cylindrical shaft 38 as an output stage, into which the rotating shaft 30 is inserted and connected by the shaft couplings 36, 36, is provided in the casing 32. The large spur gear 40 fixed to the cylindrical shaft 38 is meshed and connected with a bevel gear 42 fixed to the input shaft 24 by an appropriate gear train, and the speed is reduced. In addition, the lubrication pump 44 is appropriately driven and connected to the gear train, and the tip of the lubrication pipe 46 is opened at the lubricating oil sump 48 in contact with the outer wall of the elbow 20 at the inside of the lower end inside the casing 32. Lubricating oil is appropriately poured into meshing portions of the gear train.
[0005]
[Problems to be solved by the invention]
In the vertical shaft pump having such a configuration, the reduction gear 22 is attached to the discharge elbow 20 and the driving device 26 is disposed on the same floor 10 as the discharge elbow 20, so that the installation height is low. . However, the total weight of the discharge elbow 20 provided with the speed reducer 22 to which the gear train is attached becomes considerably heavy, and a large crane or the like for mounting the discharge elbow 20 is required. Therefore, if the discharge elbow 20 is installed without the gear train and the speed reducer 22 is completed by incorporating the gear train into the discharge elbow 20, a large crane is not required for this. However, there is a problem that the work at the installation site increases accordingly and the installation takes time.
[0006]
The present invention has been made in view of the circumstances of the prior art as described above, and an object of the present invention is to provide an elbow with a transmission that does not require a large crane for installation, and that does not increase the work on the installation site. And It is another object of the present invention to provide a vertical shaft pump that can be easily installed using the elbow with a transmission.
[0007]
[Means for Solving the Problems]
In order to achieve this object, an elbow with a transmission according to the present invention is characterized in that a rotation shaft projects vertically through an outer wall of the elbow, a transmission is attached to the outer wall of the elbow, and the rotation shaft protruding from the elbow is attached to the elbow. An elbow with a transmission that is drivingly connected to the transmission, wherein the elbow is divided into upper and lower parts.
[0008]
Further, at least a part of the transmission is disposed in the upper part of the elbow, and a cylindrical shaft for inserting and connecting the rotating shaft to the transmission is provided. It may be configured such that the rotating shaft can be connected to the cylindrical shaft by hanging down, and the upper part of the elbow can be assembled to the lower part of the elbow.
[0009]
In the vertical shaft pump according to the present invention, the rotating shaft vertically protrudes through the outer wall of the discharge elbow, and a reduction gear is attached to the outer wall of the discharge elbow, and the rotating shaft protruding from the discharge elbow is decelerated. A vertical shaft pump that is drivingly connected to an apparatus, wherein the discharge elbow is divided into upper and lower parts.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an exploded vertical sectional view of an elbow with a transmission according to the present invention. FIG. 2 is an exploded perspective view of the elbow. 1 and 2, the same or equivalent members as those shown in FIGS. 3 and 4 are denoted by the same reference numerals, and redundant description will be omitted.
[0011]
First, assuming that the elbow with a transmission of the present invention is used for a vertical shaft pump, the elbow is a discharge elbow and the transmission is a reduction gear. The discharge elbow 60 of the present invention is divided into upper and lower parts by a horizontal division surface at a substantially center of a discharge flow path which is substantially horizontal. Then, a part 64a of the casing 64 of the reduction gear 62 is formed integrally with the lower elbow portion 60a, and the lubricating oil reservoir 48 that contacts the outer wall of the lower elbow portion 60a is formed. Further, another part 64b of the casing 64 of the reduction gear transmission 62 is integrally formed with the elbow upper part 60b. Further, a flange for joining and fixing to each other is provided on the divided surface of the lower elbow portion 60a and the upper elbow portion 60b, and a seal member 66 is provided on one of the flanges provided on the outer wall of the flow path. Are joined in a watertight manner. Most of the gear train including the cylindrical shaft 38 as an output stage to which the large spur gear 40 of the reduction gear 62 is fixed is assembled to a part 64b of the casing 64 provided on the elbow upper part 60b. Further, the input shaft 24 protruding in the horizontal direction is rotatably supported on the input shaft casing 68 around the shaft, and the bevel gear 42 is fixed to the tip of the input shaft 24. Then, with the elbow lower part 60a and the elbow upper part 60b joined and fixed, the input shaft casing 68 is assembled and fixed to the casing 64 from the outside, and the bevel gear 42 is meshed and connected to the gear train.
[0012]
In such a configuration, the water pump 14 and the like are suspended from the floor 10 as in the conventional vertical pump, and the elbow lower portion 60a is stacked and joined thereon. Here, the rotating shaft 30 vertically disposed in the pumping pipe 14 projects through the upper outer wall of the lower part 60a of the elbow in a watertight manner via a gland packing or the like. Further, the elbow upper portion 60b, to which most of the reduction gear 62 is assembled, is suspended from the upper portion of the lower elbow portion 60a, and the rotary shaft 30 is inserted into the cylindrical shaft 38. Then, the cylindrical shaft 38 and the rotating shaft 30 are drivingly connected by the shaft couplings 36, 36, and the elbow upper portion 60b is joined and fixed to the elbow lower portion 60a. Further, the input shaft casing 68 is assembled and fixed to the joined casing 64 from the outside, and the bevel gear 42 is meshed and connected to the gear train. In FIG. 1, the oil suction pipe 46 is shown as connecting the lubrication pump 44 and the lubricating oil sump 48, but these pipes are constructed after the elbow lower part 60a is assembled to the elbow upper part 60b. Of course.
[0013]
In the installation of the elbow with a reduction gear as described above, the discharge elbow 60 is divided into upper and lower parts, and the weight of the lower part 60a of the elbow is less than half of that of the conventional elbow with a reduction gear. is there. In addition, the elbow upper part 60b to which most of the reduction gear 62 is assembled is also light because the input shaft 24 is separated and the elbow lower part 60a is separated. Therefore, in the vertical shaft pump using the discharge elbow 60 provided with the reduction gear 62 of the present invention, the installation height can be reduced similarly to the conventional vertical shaft pump previously proposed, and furthermore, for installation. This does not require a large crane, which is necessary for the construction, and the structure of the building can be reduced accordingly. Further, by providing the reduction gear 62 with the cylindrical shaft 38 as an output stage and suspending the rotation shaft 30 from above, the rotation shaft 30 and the reduction gear 62 can be drive-coupled. The parts can be assembled, and work on the installation site can be reduced.
[0014]
In the description of the above embodiment, the elbow with a transmission has been described as an elbow with a reduction gear used for a vertical shaft pump. However, the present invention is not limited to this. Is also good. Here, the cylindrical shaft 38 is an input stage driven to rotate by the rotary shaft 30, and the input shaft 24 protruding in the horizontal direction is an output shaft as an output stage. Further, the transmission may be configured as a gear train capable of reversible operation so that the transmission can be operated by either the reduction gear or the speed increasing device. Further, in the above embodiment, the elbow is divided into upper and lower parts at the center of the flow path in the horizontal direction. However, the present invention is not limited to this. The division surface need not be one horizontal direction passing through the center of the flow path, and may be divided including two or more horizontal division surfaces. Furthermore, if the dividing surface is not horizontal and the elbow upper portion 60b can be stably joined to the elbow lower portion 60a, the dividing surface may be a slope. Then, the input shaft 24 may be assembled to the reduction gear 62 in advance at a factory or the like.
[0015]
【The invention's effect】
As described above, since the elbow with a transmission and the vertical pump according to the present invention are configured, the following special effects can be obtained.
[0016]
In the elbow with a transmission according to the first aspect, since the elbow is divided into upper and lower parts, the weight of each of the elbow upper part and the elbow lower part provided with the transmission is reduced, which is necessary for installation. Small crane is enough.
[0017]
In the elbow with a transmission according to the second aspect, the upper part of the elbow is suspended from the lower part of the elbow and assembled, and the rotating shaft can be drivingly connected to the transmission, so that the assembly is easy. Also, since a part of the transmission is pre-assembled on the upper part of the elbow, the work on the installation site may be reduced.
[0018]
In the elbow with a transmission according to the third aspect, since the elbow is divided into upper and lower portions substantially at the center of the horizontal flow path, the upper portion of the elbow is stably fixed to the lower portion of the elbow. can do.
[0019]
In the elbow with a transmission according to the fourth aspect, the lubricating oil reservoir is formed integrally with the lower portion of the elbow, so that the lubricating oil accumulated here is surely cooled by the fluid in the flow passage.
[0020]
In the elbow with a transmission according to the fifth aspect, since the input shaft or the output shaft protrudes in the horizontal direction, it is possible to arrange a driving machine or the like that is drivingly connected to the input shaft or the output shaft on the same floor as the elbow. Is low enough.
[0021]
In the elbow with a transmission according to claim 6, since the input shaft or the output shaft can be assembled from outside the transmission, the input shaft is assembled after the elbow upper portion is assembled to the elbow lower portion. And the weight of each part can be reduced accordingly.
[0022]
In the vertical shaft pump according to the seventh aspect, the discharge elbow can be installed with a small crane, and the building can be constructed at a low cost.
[Brief description of the drawings]
FIG. 1 is an exploded vertical sectional view of an elbow with a transmission according to the present invention.
FIG. 2 is an exploded perspective view of an elbow.
FIG. 3 is an overall structure of the previously proposed vertical shaft pump.
FIG. 4 is a longitudinal sectional view of a discharge elbow with a reduction gear proposed earlier.
[Explanation of symbols]
20, 60 Discharge elbow 22, 62 Reduction gear 24 Input shaft 30 Space 32, 64 Casing 36 Coupling 38 Cylindrical shaft 40 Large spur gear 42 Bevel gear 48 Lubricating oil sump 60a Elbow lower part 60b Elbow upper part 64a, 64b Casing Part 66 of the seal member 68 Input shaft casing

Claims (7)

A rotating shaft that vertically projects through an outer wall of the elbow, a transmission is attached to the outer wall of the elbow, and the rotating shaft protruding from the elbow is drivingly connected to the transmission. Characterized in that the elbow is divided into upper and lower parts. The elbow with a transmission according to claim 1, wherein at least a part of the transmission is disposed on an upper portion of the elbow, and a cylindrical shaft for inserting and connecting the rotating shaft to the transmission is provided, and a lower portion of the elbow is provided. A transmission configured to suspend the elbow upper portion, connect the rotary shaft to the cylindrical shaft, and attach the elbow upper portion to the elbow lower portion. With elbow. 2. The elbow with a transmission according to claim 1, wherein the elbow is divided into upper and lower portions substantially at the center of a horizontal flow path. The transmission according to claim 1, wherein a part of a casing of the transmission is formed integrally with a lower portion of the elbow so as to be a lubricating oil reservoir of the transmission. Elbow with device. 2. The elbow with a transmission according to claim 1, wherein an input shaft or an output shaft of the transmission is projected in a horizontal direction. 6. The elbow with a transmission according to claim 5, wherein the input shaft or the output shaft is assembled to the transmission from the outside so as to be drive-coupled. A vertical shaft pump in which a rotating shaft projects vertically through an outer wall of the discharge elbow, a reduction gear is attached to the outer wall of the discharge elbow, and the rotary shaft protruding from the discharge elbow is drivingly connected to the reduction gear. A vertical pump wherein the discharge elbow is divided into upper and lower parts.

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