Horizontal-axis cylindrical pump

Abstract

To provide a horizontal shaft cylindrical pump with higher availability.SOLUTION: A horizontal shaft cylindrical pump 100 comprises: an orthogonal shaft gear speed reducer 102 of which an input shaft 102a protrudes vertically and an output shaft 102b protrudes horizontally from a trunk 102s that seals the inside; an impeller 104 directly supported on the output shaft 102b; guide vanes 110 that rectify pressurized water generated by the impeller 104; and cylindrical outer trunks 106, 108, 112, 114 that surround the impeller 104, the guide vanes 110, and the orthogonal shaft gear speed reducer 102 to form a water passage for flowing pressurized water between themselves and the trunk 102s, and expose the input shaft 102a of the orthogonal shaft gear speed reducer 102 to the outside while sealing the inside.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a horizontal-axis cylindrical pump used, for example, for adjusting the water level of rivers and draining water in various places.

Background Art

[0002] This type of horizontal-axis cylindrical pump is also called a tube pump. Conventionally, a main shaft bearing, a speed reducer, a shaft coupling (coupling), and a driving machine (motor) are built into an inner cylinder (inner body), and a structure of an in-line pump in which an impeller is connected to a main shaft has been the mainstream (for example, see Non-Patent Document 1). The inner cylinder and the impeller incorporating various devices are entirely surrounded by an outer cylinder, and a water passage for flowing the pressurized water generated by driving the impeller is formed between the outer cylinder and the inner cylinder.

Prior Art Documents

Patent Documents

[0003]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The drawbacks of conventional horizontal-axis cylindrical pumps (tubular pumps) include their complex structure, the resulting difficulty in installation, and high maintenance costs. Specifically, when driving the impeller using a gear reducer, the gear reducer's rotating shaft and the gear's rotating shaft are connected via a coupling. Furthermore, multiple bearings for the impeller's rotating shaft must be installed, and the bearings, couplings, gear reducer, and drive mechanism must all be mounted in an inner casing equipped with water seals. In addition, an outer casing is required to form a water flow channel for the pressurized water from the impeller, requiring an extremely complex structural design. As a result, the overall pump shape and dimensions become very long, and the structures of the pumping stations where the pumps are installed tend to be large as well. Moreover, the burden of maintenance after installation is significant, and disassembly and inspection work is difficult due to the complex structure, resulting in high costs.

[0005] Furthermore, given that the primary purpose of this type of pump is flood control, and considering that its introduction will progress globally in areas with high rainfall due to future climate change, the fact that each pumping station requires a large-scale facility structure and enormous maintenance costs is not desirable from the perspective of the SDGs (Sustainable Development Goals), which have been attracting attention in recent years.

[0006] Therefore, the present invention provides a more useful horizontal-axis cylindrical pump. [Means for solving the problem]

[0007] The present invention provides the following horizontal-axis cylindrical pump. Note that the following parenthetical statements are merely examples, and the present invention is not limited thereto.

[0008] The horizontal-axis cylindrical pump of the present invention employs a right-angle gear reducer. The right-angle gear reducer has a sealed body, and a gear reduction mechanism is housed inside this body. An input shaft protrudes from the body in the vertical direction, and an output shaft protrudes in the horizontal direction. The horizontal-axis cylindrical pump also includes an impeller and guide vanes. The impeller is directly supported on the output shaft of the right-angle gear reducer. The guide vanes are positioned immediately behind the impeller in the direction of water flow to straighten the pressurized water. The horizontal-axis cylindrical pump has a cylindrical outer shell, which surrounds the impeller, guide vanes, and right-angle gear reducer. In this configuration, the outer shell forms a water channel for pressurized water between itself and the body of the right-angle gear reducer, while the input shaft of the right-angle gear reducer is exposed to the outside while the inside is sealed.

[0009] According to the horizontal-axis cylindrical pump of the present invention, the pump body consists only of an outer shell, and the pressurized water flows through a water channel formed by the body of the right-angle gear reducer and the outer shell. Therefore, there is no need for a double-layered, upper-lower split casing structure with an inner shell and an outer shell as in conventional types, which allows for miniaturization, reduction in length, and simplification of the structure.

[0010] Furthermore, by employing a single-shaft structure in which the impeller is directly connected to the output shaft of the right-angle gear reducer, there is no need to connect the output shaft of the gear reducer and the rotation shaft of the impeller via a shaft coupling as in conventional designs. Moreover, since there is no separate rotation shaft for the impeller, there is no need to install bearings in various places, which reduces the number of parts, as well as lowers manufacturing costs and weight. Even with this structure in which the overall length is shortened by directly connecting the impeller to the output shaft of the right-angle gear reducer, the desired pump efficiency can be obtained by providing the necessary guide vanes immediately behind the impeller.

[0011] Furthermore, by employing a right-angle gear reducer, the drive unit (motor) connected to its input shaft can be installed at a higher position (in the air above the water surface), offering the advantage of avoiding submersion in the event of flooding. In this respect, if the drive unit is built into the inner casing as in conventional designs, if the water seal in the inner casing is damaged, the drive unit will inevitably be submerged, resulting in more severe damage. However, this present invention does not have such a risk. Moreover, because the drive unit is installed in the air above the water surface, the power supply to the drive unit and the wiring for sensors can all be the same as those used on land, making it simpler, easier, and safer in terms of maintenance and management.

[0012] Furthermore, the horizontal-axis cylindrical pump of the present invention uses a cylindrical material for the outer casing that does not have a joint in the circumferential direction (it is not a horizontally split structure), and can have an integrated structure in which the right-angle gear reducer and the outer casing are mutually connected inside the outer casing.

[0013] This eliminates the need to adopt a structure in which the outer casing is divided into multiple parts, as in conventional designs (for example, a horizontally split casing). This offers a significant advantage: when installing the pump at an actual pumping station, the pump can be transported and installed as is, without disassembling (dividing) it, with the other components (impeller, guide vanes, and right-angle gear reducer) housed inside the outer casing, which is made of cylindrical pipes.

[0014] Furthermore, it shortens the time required for each stage, from structural design to manufacturing, transportation, and on-site installation. Even after commissioning, it offers significant maintenance advantages due to the ease of inspection and other tasks, and the reduction in environmental impact is far greater than with conventional systems. Therefore, it is also desirable from an SDG perspective.

[0015] Furthermore, the overall length of the outer casing, viewed in the lateral direction (axial direction, water flow direction), is comprised of the combined length of the section enclosing at least the impeller and guide vanes, and the section enclosing the orthogonal-axis gear reducer.

[0016] This allows for a reduction in overall horizontal length compared to conventional models, contributing to a smaller and lighter design.

Advantages of the Invention

[0017] According to the present invention, a more useful horizontal-axis cylindrical pump can be provided.

Brief Description of the Drawings

[0018] [Figure 1] It is a figure which shows the structural example of the horizontal-axis cylindrical pump 100 of 1st Embodiment. [Figure 2] It is a figure which shows the structural example of the horizontal-axis cylindrical pump 200 of the second embodiment. [Figure 3] It is a figure which shows a comparison of the horizontal-axis cylindrical pump 200 and a conventional pump. [Figure 4] It is a figure which shows the installation example of the horizontal-axis cylindrical pump 200.

Modes for Carrying Out the Invention

[0019] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments described below are merely examples, and the present invention is not limited thereto.

[0020] 〔First Embodiment〕 FIG. 1 is a diagram showing a structural example of the horizontal-axis cylindrical pump 100 according to the first embodiment. Here, when looking at the installation state of the horizontal-axis cylindrical pump 100, the direction of the X-axis shown in the figure is taken as the horizontal direction (horizontal direction), the direction of the Z-axis is taken as the vertical direction (vertical or perpendicular direction), and the direction of the Y-axis is taken as the width direction. The direction of the arrow of the X-axis is taken as the water flow direction of the pressurized water. In addition, in FIG. 1, a part is shown in a longitudinal section. The horizontal-axis cylindrical pump 100 is a medium to large-sized pump and a low to medium head pump that can be used, for example, for flood countermeasures and similar countermeasures.

[0021] 〔Orthogonal shaft gear reducer〕 The horizontal-axis cylindrical pump 100 includes an orthogonal-axis gear reducer 102, and this orthogonal-axis gear reducer 102 has a structure with its interior sealed by a housing 102s. The housing 102s is a component part of the orthogonal-axis gear reducer 102 and is not structurally an added part later. Here, as an example, a form is given in which the housing 102s is mainly divided into three parts when viewed in the horizontal direction, but the housing 102s may also be of an integral type. The housing 102s, for example, has a bullet shape as a whole and is divided into two parts with a cylindrical shape and one part with a frustum of a cone shape on the outer surface. Also, the housing 102s houses an orthogonal gear (bevel gear) reduction mechanism not shown inside.

[0022] As another example, here, in addition to a front cover body 102c being provided so as to be continuous with the housing 102s on the upstream side in the water flow direction, a rear cover body 102d is also provided so as to be continuous with the housing 102s on the downstream side. Among these, the front cover body 102c has a hollow inverted frustum of a cone shape that widens towards the end in the horizontal direction (water flow direction), while the rear cover body 102d has a hollow frustum of a cone shape that tapers in the horizontal direction (water flow direction). Note that such a front cover body 102c and rear cover body 102d may not be provided specifically.

[0023] From the housing 102s of the orthogonal-axis gear reducer 102, an input shaft 102a protrudes in the vertical direction, and an output shaft 102b protrudes in the horizontal direction. The housing 102s protrudes with both the input shaft 102a and the output shaft 102b in a state of being water-sealed. For this reason, in this embodiment, there is no need to install the orthogonal-axis gear reducer 102 on a separately provided inner housing (casing) or the like. Note that since the structures of the water seal and the gear reduction mechanism are already known, their descriptions are omitted here together with the illustrations.

[0024] [Impeller] Furthermore, the horizontal-axis cylindrical pump 100 is equipped with an impeller 104. As shown in the partial cross-section in the figure, the impeller 104 is directly supported by the output shaft 102b of the right-angle gear reducer 102. In other words, the right-angle gear reducer 102 and the impeller 104 are integrated into a single-axis structure, and the impeller 104 does not have its own rotation axis; the output shaft 102b of the right-angle gear reducer 102 serves as the rotation axis of the impeller 104. Therefore, in this embodiment, there is no need to connect the right-angle gear reducer 102 and the impeller 104 with a coupling or the like, and the impeller 104 does not need its own rotation axis, so there is no need to provide bearings in front of or behind the impeller 104.

[0025] [Outer shell] The horizontal-axis cylindrical pump 100 comprises outer casings 106, 108, 112, and 114, which constitute the only outer shell of the horizontal-axis cylindrical pump 100. Each of the outer casings 106, 108, 112, and 114 is made of cylindrical pipe (straight or tapered pipe) material, forming a single, integrated structure without any joints in the circumferential direction. Of these, the outer casing 106, located on the upstream (suction) side in the water flow direction, surrounds a portion of the impeller 104 and a portion of the output shaft 102b, which is integrated with it, in the lateral direction. In this example, the upstream portion has a shape resembling a suction bell. The shape of this portion can be modified as appropriate.

[0026] Next, the outer casing 108, which is connected in the direction of water flow, surrounds a part of the impeller 104 and a part of the right-angle gear reducer 102 (particularly the front cover 102c), and has a hollow inverted truncated cone shape to match the shape of the inner front cover 102c. Subsequently, the outer casing 112, which is connected in the direction of water flow, surrounds a part of the right-angle gear reducer 102, and has a cylindrical shape to match the shape of the inner casing 102s, exposing the input shaft 102a to the outside in the vertical direction (upward). Finally, the outer casing 114, located on the downstream (discharge) side in the direction of water flow, surrounds the rear cover 102d, and has a hollow truncated cone shape (tapered pipe shape) that takes into account the shape of the rear cover 102d and the dimensions as a discharge pipe. Note that the shape and dimensions are not limited to the examples shown.

[0027] Thus, although the outer shells 106, 108, 112, and 114 are divided into multiple (four) parts, they are connected in the direction of water flow and form a single integrated structure. Therefore, in this embodiment, there is no need to adopt a structure in which the outer shells 106, 108, 112, and 114 are split in half vertically. Furthermore, a water channel through which pump-pressurized water flows is formed between the outer shells 106, 108, 112, and 114 and the body 102s and front and rear cover bodies 102c and 102d of the right-angle gear reducer 102.

[0028] [Guide vanes] Inside the front cover body 102c, guide vanes 110 are provided between the front cover body 102c and the impeller 104. In this embodiment, the impeller 104 is directly connected to the output shaft 102b of the right-angle gear reducer 102 to shorten the overall length, while guide vanes 110 are provided immediately behind the impeller 104 in the direction of water flow. Such guide vanes 110 are designed and installed with appropriate shape and dimensions to achieve a predetermined efficiency.

[0029] [Integrated structure] The outer casing 112 and the body 102s of the right-angle gear reducer 102 are interconnected within the outer casing 112 by connecting parts 102e and 102f. The connecting parts 102e and 102f are located above and below the right-angle gear reducer 102 (body 102s), respectively. The lower connecting part 102e is fixed to the inner wall surface of the outer casing 112, supporting the right-angle gear reducer 102, including the integrally structured impeller 104, from below. The upper connecting part 102f is similarly fixed to the inner wall surface of the outer casing 112, supporting the right-angle gear reducer 102, including the impeller 104, from above. As a result, within the outer casings 106, 108, 112, and 114, the impeller 104 and the right-angle gear reducer 102 are interconnected, forming an integrated structure. Furthermore, the input shaft 102a of the right-angle gear reducer 102 passes through the interior of the upper connecting portion 102f and protrudes vertically (upward) from the outer casing 112. For this reason, the connecting portion 102f also has a structure that allows the input shaft 102a to pass through its interior while being sealed with water.

[0030] Mounting legs 116 are provided on the lower outer surfaces of the outer shells 108, 112, and 114, and the horizontal-axis cylindrical pump 100 can be installed, for example, on the foundation BS of a pumping station via these mounting legs 116. Note that the arrangement and shape of the mounting legs 116 shown in the figure are examples and may be modified as appropriate.

[0031] [Second Embodiment] Figure 2 shows an example of the structure of the horizontal-axis cylindrical pump 200 of the second embodiment. In Figure 2, (A) is a front view in the direction of water flow, (B) is a side view with a part of it in cross-section, and (C) is a rear view. Here as well, when viewing the horizontal-axis cylindrical pump 200 in its installed state, the direction of the X axis shown in the figure is the horizontal direction, the direction of the Z axis is the vertical direction, and the direction of the Y axis is the width direction. Everything else is the same as in the first embodiment.

[0032] [Right-angle gear reducer] Similarly, in the second embodiment, the horizontal-axis cylindrical pump 200 is equipped with a right-angle gear reducer 202, which also has a structure in which the inside is sealed by a body 202s. Here again, the body 202s is a component of the right-angle gear reducer 202 and is not structurally added later. The body 202s is integrally molded, and here, as an example, the outer shape of the upstream part in the direction of water flow is an inverted frustoconical shape, and the part connected to it is cylindrical, but it is not limited to this example. Furthermore, the body 202s houses a right-angle gear (bevel gear) reduction mechanism, which is not shown.

[0033] As an example, in this configuration, a front cover body 202c is provided on the upstream side in the direction of water flow, connected to the main body 202s, and a rear cover body 202d is also provided on the downstream side, connected to the main body 202s. The front cover body 202c is cylindrical, while the rear cover body 202d is a hollow frustoconical shape that tapers laterally (in the direction of water flow). Note that such front cover body 202c and rear cover body 202d are not necessarily provided.

[0034] The input shaft 202a protrudes vertically from the body 202s of the right-angle gear reducer 202, and the output shaft 202b protrudes horizontally. The body 202s allows both the input shaft 202a and the output shaft 202b to protrude while being sealed with water. Therefore, in the second embodiment as well, there is no need to install the right-angle gear reducer 202 in a separate inner body (casing) or the like.

[0035] [Impeller] Furthermore, the horizontal-axis cylindrical pump 200 is equipped with an impeller 204. Here again, the impeller 204 is directly supported by the output shaft 202b of the right-angle gear reducer 202. In other words, here again, the right-angle gear reducer 202 and the impeller 204 are integrated into a single-axis structure, and the impeller 204 does not have its own rotation axis; the output shaft 202b of the right-angle gear reducer 202 serves as the rotation axis of the impeller 204. Although not shown in the diagram, the output shaft 202b extends through the inside of the impeller 204. Therefore, in the second embodiment as well, there is no need to connect the right-angle gear reducer 202 and the impeller 204 with a coupling or the like, and the impeller 204 does not need its own rotation axis, so there is no need to provide bearings in front of or behind the impeller 204.

[0036] [Outer shell] The horizontal-axis cylindrical pump 200 of the second embodiment comprises outer shells 206, 208, and 212 that are cylindrical in shape overall, and an outer shell 214 that is hollow and frustoconical in shape overall. These outer shells 206, 208, 212, and 214 constitute the only outer shell of the horizontal-axis cylindrical pump 200. Furthermore, outer shells 206, 208, and 212 are each made of cylindrical (straight pipe) material and have a one-piece structure without any joints due to divisions in the circumferential direction. Similarly, outer shell 214 is made of tapered pipe material and also has a one-piece structure without any joints due to divisions in the circumferential direction. Of these, outer shell 206, which is located on the upstream (suction) side when viewed in the water flow direction, surrounds the impeller 104 and a part of the output shaft 202b which is integrated with it.

[0037] Next, the outer casing 208, which is connected in the direction of water flow, surrounds a part of the right-angle gear reducer 202 (particularly the front cover body 202c) and has a cylindrical shape to match the shape of the front cover body 202c. Subsequently, the outer casing 212, which is connected in the direction of water flow, surrounds a part of the right-angle gear reducer 202 and has a cylindrical shape to match the cylindrical part of the inner casing 202s, exposing the input shaft 202a to the outside in the vertical direction (upward). Then, the outer casing 214, located on the downstream (discharge) side in the direction of water flow, surrounds the rear cover body 202d and has a hollow frustoconical shape (tapered pipe) that takes into account the shape of the rear cover body 202d and the dimensions as a discharge pipe. Note that the shape and dimensions are not limited to the example shown. Also, the outer casing 214 is omitted in Figure 2(c).

[0038] Thus, in the second embodiment as well, the outer shells 206, 208, 212, and 214 are divided into multiple (three) parts, but as a whole they are connected in the direction of water flow and form an integrated structure. Therefore, similarly in the second embodiment as well, there is no need to adopt a structure in which the outer shells 206, 208, 212, and 214 are split in half vertically. Furthermore, a water channel through which pump-pressurized water flows is formed between the outer shells 206, 208, 212, and 214 and the body 202s and front and rear cover bodies 202c and 202d of the right-angle gear reducer 202.

[0039] [Guide vanes] Inside the front cover body 202c, guide vanes 210 are provided between the front cover body 202c and the impeller 204. In the second embodiment as well, the structure shortens the overall length by directly connecting the impeller 204 to the output shaft 202b of the right-angle gear reducer 202, and guide vanes 210 are provided immediately behind the impeller 204 in the direction of water flow. Such guide vanes 210 are designed and installed with appropriate shape and dimensions to achieve a predetermined efficiency.

[0040] [Integrated structure] Similarly in the second embodiment, the outer casing 212 and the body 202s of the right-angle gear reducer 202 are interconnected within the outer casing 212 by connecting parts 202e and 202f. The connecting parts 202e and 202f are located above and below the right-angle gear reducer 202 (body 202s), respectively. The lower connecting part 202e is fixed to the inner wall surface of the outer casing 212 while supporting the right-angle gear reducer 202, including the integrally structured impeller 204, from below. The upper connecting part 202f is also fixed to the inner wall surface of the outer casing 212 while supporting the right-angle gear reducer 202, including the impeller 204, from above. As a result, inside the outer casings 206, 208, 212, and 214, the impeller 204 and the right-angle gear reducer 202 are interconnected, forming an integrated structure. The input shaft 202a of the right-angle gear reducer 202 passes through the interior of the upper connecting section 202f and protrudes vertically (upward) from the outer casing 212. Therefore, the connecting section 202f also has a structure that allows the input shaft 202a to pass through its interior while being sealed with water.

[0041] Similarly in the second embodiment, mounting legs 216 are provided on the lower outer surfaces of the outer shells 206, 208, 212, and 214, and the horizontal-axis cylindrical pump 200 can be installed, for example, on the foundation BS of a pumping station via these mounting legs 216. Note that the arrangement and shape of the mounting legs 216 shown in the figure are examples and may be modified as appropriate.

[0042] [Comparison with conventional models] Figure 3 is a diagram comparing the horizontal-axis cylindrical pump 200 of this embodiment (referred to here as the second embodiment) with a conventional pump. In Figure 3, (A) is a schematic diagram of the horizontal-axis cylindrical pump 200 of this embodiment, (B) is a schematic diagram of the horizontal-axis cylindrical pump 300 of the first comparative example (conventional type 1), and (C) is a schematic diagram of the horizontal-axis cylindrical pump 400 of the second comparative example (conventional type 2). This mainly shows a comparison of the length dimensions in the horizontal direction (water flow direction). A detailed explanation follows below.

[0043] [This embodiment] In Figure 3 (A): As described above, in this embodiment, a right-angle gear reducer 202 is employed, and by connecting a drive unit 220 such as a motor to the input shaft 202a that protrudes vertically upward, the drive unit 220 can be installed at a higher position. Consequently, there is no need to secure space for the drive unit 220 in the lateral direction, and the overall length dimension L1 is kept short. Furthermore, since the right-angle gear reducer 202 and the impeller 204 are integrated into a single-shaft structure, there is no need to connect a rotating shaft or the like to the output shaft 202b, further shortening the length dimension L1, and eliminating the need for installation space for couplings, bearings, etc., thus reducing the number of parts. In addition, by providing guide vanes 210 inside the outer casing 208 immediately after the impeller 204, the desired efficiency as a pump can be obtained. Moreover, since the pump body has a single-layer structure of outer casings 206, 208, 212, and 214, the diametrical dimension D1 can also be kept small.

[0044] [Reference figures] Length L1: Approximately 3,540 mm Diameter D1: Approximately 2,750 mm Drive unit output: 560kW Drive unit rotation speed: 765 rpm Reduction ratio: 4.454 Impeller rotation speed: 165 rpm The above is for reference only.

[0045] [Comparative Example 1 (Conventional Type 1)] In Figure 3(B): The conventional horizontal-axis cylindrical pump 300, which is the first comparative example, is equipped with a gear reducer 302 and an impeller 304, but the impeller 304 has a unique rotating shaft 318. Also, since the gear reducer 302 is not orthogonal, it is necessary to position a drive unit 312 such as a motor behind the gear reducer 302. The input shaft 302a of the gear reducer 302 and the output shaft 312a of the drive unit 312 are connected via a coupling 320, and the rotating shaft 318 of the impeller 304 and the output shaft 302b of the gear reducer 302 are also connected via a coupling 320. The rotating shaft 318 of the impeller 304 is supported by bearings 322 installed at multiple locations, and a water seal 324 or the like is installed at the part of the rotating shaft 318 that is exposed underwater. Furthermore, the rotating shaft 318, bearings 322, gear reducer 302, coupling 320, drive unit 312, etc. are installed within the inner casings 330, 332, and these, along with the impeller 304, are all surrounded by the outer casings 306, 308, 310. As a result, the overall length dimension L2 is very long, and because it is a double casing structure with the inner casings 330, 332 and the outer casings 306, 308, 310, the diameter dimension D2 of the rotating shaft 318 is also large (see page 5 of Non-Patent Document 1).

[0046] [Comparative Example 2 (Conventional Type 2)] In Figure 3 (C): The conventional horizontal-axis cylindrical pump 400, which is the second comparative example, is equipped with a gear reducer 402 and an impeller 404. However, the impeller 404 does not have its own rotating shaft, and the impeller 404 is connected to the output shaft 402b of the gear reducer 402. However, since the gear reducer 302 is not orthogonal, it is necessary to place a drive unit 412 such as a motor behind the gear reducer 402, and the input shaft 402a of the gear reducer 402 and the output shaft 412a of the drive unit 412 are connected via a coupling 420. In addition, a water seal 424 or the like is installed at the part of the output shaft 402b of the gear reducer 402 that is exposed underwater. Furthermore, since the gear reducer 402, coupling 420, drive unit 412, etc. are installed within the inner casings 430, 432, and these, along with the impeller 404, are all surrounded by the outer casings 406, 408, 410, the overall length dimension L3 is also quite long. Additionally, due to the double casing structure of the inner casings 430, 432 and the outer casings 406, 408, 410, the diameter dimension D3 of the rotating shafts (input shaft 402a and output shaft 402b) is also large (see page 4 of Non-Patent Document 1).

[0047] [Summary of the comparisons] (1) In both the first and second comparative examples, the overall length dimensions L2 and L3 are longer than the length dimension L1 of this embodiment. Conversely, in this embodiment, the length dimension L1 can be shortened to about 1 / 3 to 1 / 2 of that of the conventional type, resulting in overall miniaturization. This is also true for the first embodiment (and the same applies below).

[0048] (2) In addition, in both the first and second comparative examples, the diametric dimensions D2 and D3 are larger overall compared to the dimension D1 of this embodiment. Conversely, in this embodiment, the diametric dimension D1 can also be reduced compared to the conventional type, and overall miniaturization is achieved.

[0049] (3) For this reason, when installing the horizontal-axis cylindrical pumps 100 and 200 of this embodiment in an actual pumping station, the structure of the pumping station can be made smaller in proportion to the miniaturization of the pumps. In this respect, conventional pumps require an extremely large pumping station (see pages 6-7 of Non-Patent Document 1).

[0050] (4) Verification conducted by the inventors of the present invention has shown that in this embodiment, the overall weight (mass) can be reduced to about half that of the conventional type, and the manufacturing cost can be reduced to about 50%. Furthermore, it has been shown that the pump installation period can be shortened to 1 / 3 to 1 / 5 of that of the conventional type. As a reference example, while it takes approximately 5 months to install four conventional large tubular pumps, in this embodiment, the installation can be completed in approximately 1 month.

[0051] (5) Furthermore, since the horizontal cylindrical pumps 100 and 200 of this embodiment have a simple structure, another advantage is that they are easier to disassemble and inspect compared to conventional types.

[0052] Thus, the horizontal-axis cylindrical pumps 100 and 200 of this embodiment are superior in terms of usefulness and reliability, and are also extremely beneficial from the perspective of the SDGs, which will be a focus of attention in the future.

[0053] [Installation example] Figure 4 shows an example of the installation of the horizontal-axis cylindrical pump 200 of this embodiment (referred to here as the second embodiment). In Figure 4, (A) is a plan view and (B) is an elevation view.

[0054] For example, the horizontal-axis cylindrical pump 200 of this embodiment can be installed in multiples in a pumping station set up on a river RV. A maintenance and installation work area YD is constructed on the riverbank of the river RV, and the horizontal-axis cylindrical pump 200 is transported to the work area YD by truck TK or the like. Inside the river RV, for example, multiple pump installation pits PT are constructed in parallel, partitioned by partition walls WL in the river width direction from the retaining wall FC, and the horizontal-axis cylindrical pump 200 is installed in each pit PT. In this case, since the horizontal-axis cylindrical pump 200 can be transported to the work area YD in a completed state and temporarily placed there, the work of installing it in each pit PT can be easily carried out.

[0055] Another advantage of adopting the right-angle gear reducer 202 is that, as shown in Figure 4(B), the drive unit 220, such as the motor, can be installed at a higher position, thus protecting it from potential flooding. This is particularly important for countries and regions with heavy rainfall, as it prevents the drive unit 220 from being submerged due to rising river levels in the RV. Furthermore, since the power supply to the drive unit 220 and the wiring for the sensors are all standard land-based, their installation is simple and easy, and the electrical system is safe.

[0056] Furthermore, by employing the right-angle gear reducer 202, it can be integrated with the outer shells 206, 208, 212, and 214 that form the water channels, eliminating the need for a horizontally split casing like conventional products (see pages 3 and 6 of Non-Patent Document 1), resulting in a simpler structure.

[0057] In this respect, with conventional pumps, the entire unit must be transported to the pumping station in a disassembled state, the lower part of the outer casing which is horizontally split into two sections is first installed, the drive unit, gear reducer, bearings, rotating shaft, coupling, etc. are installed in the inner casing, and then the entire unit must be completed on-site by carefully sealing the joint between the lower part of the outer casing and the inner casing and covering it with the upper part of the outer casing. This process involves many steps and fine adjustments, requiring a great deal of time and effort, but this embodiment can eliminate these problems.

[0058] The above describes the advantages of the horizontal-axis cylindrical pump 200 of the second embodiment, but the horizontal-axis cylindrical pump 100 of the first embodiment also has similar advantages.

[0059] The present invention can be implemented in various ways without being limited to the embodiments described above. The structures given in the various embodiments are merely examples, and the details of the structure can be appropriately modified depending on the operating conditions and environment of the pump.

[0060] The horizontal-axis cylindrical pumps 100 and 200 can be used not only for flood control but also for other applications. Other numerical values ​​mentioned are merely examples and are not the only applicable values. [Explanation of symbols]

[0061] 100,200 Horizontal-axis cylindrical pump 102,202 Right-angle gear reducers 102a, 202a Input axis 102b, 202b Output shaft 104,204 Impeller 110,210 guide wings 106, 108, 112, 114 Outer shell 206, 208, 212, 214 Outer shell

Claims

1. A right-angle gear reducer with an input shaft protruding vertically and an output shaft protruding horizontally from a body that seals the interior, An impeller directly supported on the output shaft of the aforementioned orthogonal-axis gear reducer, A guide vane that rectifies the pressurized water from the impeller in the direction of water flow in a section forward of the input shaft of the orthogonal-axis gear reducer that does not overlap with the input shaft, The impeller, the guide vanes, and the right-angle gear reducer are surrounded by a cylindrical outer casing that forms a water channel for pressurized water to flow between it and the body of the right-angle gear reducer, and which exposes the input shaft of the right-angle gear reducer to the outside while the inside is sealed. A horizontal-axis cylindrical pump characterized in that, inside the outer casing, the outer diameter of the casing at the point where the input shaft of the orthogonal-axis gear reducer protrudes is set to be larger than the inner diameter of the outlet of the impeller, thereby forming a section where the water flow direction is inclined with respect to the output shaft at the rear position of the impeller.

2. In the horizontal-axis cylindrical pump according to claim 1, The outer shell is made of a cylindrical material that does not have a seam in the circumferential direction. A horizontal-axis cylindrical pump characterized by having an integrated structure in which the orthogonal-axis gear reducer and the outer casing are interconnected inside the outer casing.

3. In the horizontal-axis cylindrical pump according to claim 1 or 2, A horizontal-axis cylindrical pump characterized in that the total length of the outer shell in the lateral direction is the sum of the length of at least the section surrounding the impeller and the guide vanes and the section surrounding the orthogonal-axis gear reducer.

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