Horizontal shaft 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 shaft cylindrical pump used, for example, for regulating the water level of rivers and draining water from various places. [Background technology]

[0002] This type of horizontal shaft cylindrical pump is also called a tubular pump, and conventionally, the mainstream structure is an in-line pump in which the main shaft bearing, reducer, shaft joint (coupling), and driver (motor) are built into the inner cylinder (inner body), and an impeller is connected to the main shaft (see, for example, Non-Patent Document 1). The inner cylinder and impeller, which house various devices, are further entirely surrounded by an outer body, and a water passage is formed between the outer body and the inner cylinder to carry pressurized water generated by driving the impeller. [Prior art documents] [Patent documents]

[0003] [Non-Patent Document 1] “Kubota Tubular Pump TDF Mixed Flow Type / TSP Axial Flow Type”, [online], December 3, 1978, Kubota Iron Works Co., Ltd. <Pump Sales Department>, [Searched September 1, 2023], Internet<URL:https: / / www.kubota.co.jp / product / pumps / products / land / pdf / catalog_land_08.pdf> Summary of the Invention [Problem to be solved by the invention]

[0004] The drawbacks of conventional horizontal-shaft cylindrical pumps (tubular pumps) include a complex structure, the associated difficulty in installation, and the high maintenance costs. That is, when driving an impeller using a gear reducer, the gear reducer rotating shaft and the gear rotating shaft are connected via a coupling, and bearings for the impeller rotating shaft must be installed in multiple locations, and the bearings, couplings, gear reducer, driver, etc. must all be installed in an inner body equipped with a water seal. In addition, it is necessary to provide an outer body to form a flow path for pressurized water from the impeller, which requires an extremely complex structural design. As a result, the pump shape and dimensions as a whole become long and large, and the structure of the pumping station where the pump is installed tends to be large as well. Furthermore, the burden of maintenance after installation is large, and disassembly and inspection work is difficult due to the complex structure, which increases the cost.

[0005] In addition, because the main use of this type of pump is for flood control, and considering that their introduction will likely increase in areas around the world with heavy rainfall as global climate change progresses, the fact that each pumping station requires large-scale facility structures and enormous maintenance costs is not desirable from the perspective of the SDGs (Sustainable Development Goals), which have attracted attention in recent years.

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

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

[0008] The horizontal shaft cylindrical pump of the present invention employs an orthogonal shaft gear reducer. The orthogonal shaft gear reducer has a body whose inside is sealed, and a gear reduction mechanism is provided inside the body. An input shaft protrudes in the longitudinal direction (vertical direction) from the body, and an output shaft protrudes in the lateral direction (horizontal direction). The horizontal shaft cylindrical pump also includes an impeller and guide vanes. The impeller is directly supported on the output shaft of the orthogonal shaft gear reducer. The guide vanes are disposed immediately after the impeller in the water flow direction to straighten the pressurized water. The horizontal shaft cylindrical pump also includes a cylindrical outer body, which surrounds the impeller, the guide vanes, and the orthogonal shaft gear reducer. In this state, the outer body forms a water passage for flowing pressurized water between the outer body and the body of the orthogonal shaft gear reducer, and exposes the input shaft of the orthogonal shaft gear reducer to the outside while sealing the inside.

[0009] According to the horizontal-shaft cylindrical pump of the present invention, the pump body has a structure consisting of only an outer body, and pressurized water flows through a water passage formed by the body and outer body of the orthogonal-shaft gear reducer. This eliminates the need for a double casing structure, consisting of an inner body and an outer body, which is split vertically, as in the conventional type, and enables the pump to be made more compact, its length to be shortened, and its structure to be simplified.

[0010] In addition, because a single-shaft structure is adopted in which the impeller is directly connected to the output shaft of the orthogonal shaft gear reducer, there is no need to connect the output shaft of the gear reducer and the rotating shaft of the impeller via a shaft coupling as in conventional types, and furthermore, because there is no separately provided rotating shaft for the impeller, there is no need to install bearings in various places, which reduces the number of parts as well as manufacturing costs and weight.Even with such a structure in which the impeller is directly connected to the output shaft of the orthogonal shaft gear reducer and the overall length is shortened, the desired efficiency of the pump can be obtained by providing the necessary guide vanes immediately after the impeller.

[0011] In addition, by adopting an orthogonal shaft gear reducer, the driving machine (motor) connected to its input shaft can be installed at a higher position (in the air above the water surface), which has the advantage of preventing it from being submerged in the unlikely event of flooding. In this regard, if the driving machine is built into the inner body as in the conventional type, if the water seal in the inner body is damaged, the driving machine cannot be avoided from being submerged, resulting in more severe damage, but this invention does not have this risk. Furthermore, since the driving machine is installed in the air above the water surface, the power supply to the driving machine and the wiring for the sensors can all be normal land-based wiring, which is simple and easy in many respects, and is safe in terms of maintenance and management.

[0012] In addition, in the horizontal shaft cylindrical pump of the present invention, a circular pipe material that has no seams in the circumferential direction (not a horizontally split structure) is used for the outer body, and the orthogonal shaft gear reducer and the outer body can be connected to each other inside the outer body to form an integrated structure.

[0013] This eliminates the need to adopt a structure in which the outer body is divided into multiple parts (for example, a horizontally split casing) as in the conventional type, and has the great advantage that when installing at an actual pumping station, the pump can be transported and installed as is, with the other parts (impeller, guide vanes and orthogonal axis gear reducer) housed inside the outer body made of a circular pipe, without having to be disassembled (divided).

[0014] Furthermore, it can shorten each period from the structural design stage to manufacturing, transportation and installation on site, and has a large advantage in terms of maintenance after operation has started due to the ease of inspection work, etc. It also reduces the environmental burden much more than conventional types. Therefore, it is also favorable from the perspective of SDGs.

[0015] Furthermore, the overall length of the outer body in the horizontal direction (axial direction, water flow direction) is composed of at least the length of the section surrounding the impeller and guide vanes and the length of the section surrounding the orthogonal shaft gear reducer.

[0016] This makes the overall lateral length shorter than that of conventional types, which contributes to making the device smaller and lighter. Effect of the Invention

[0017] According to the present invention, a horizontal shaft cylindrical pump having higher usability can be provided. [Brief description of the drawings]

[0018] [Figure 1] 1A to 1C are diagrams illustrating an example of the structure of a horizontal shaft cylindrical pump 100 according to a first embodiment. [Diagram 2] 1A to 1C are diagrams illustrating an example of the structure of a horizontal-shaft cylindrical pump 200 according to a second embodiment. [Diagram 3] 1 is a diagram showing a comparison between a horizontal-shaft cylindrical pump 200 and a conventional pump. [Figure 4] FIG. 1 is a diagram showing an example of installation of a horizontal-shaft cylindrical pump 200. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that 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 a horizontal-shaft cylindrical pump 100 according to a first embodiment. In this figure, the X-axis direction in the installed state of the horizontal-shaft cylindrical pump 100 is the horizontal direction, the Z-axis direction is the vertical direction, and the Y-axis direction is the width direction. The arrow on the X-axis points in the direction of the flow of pressurized water. FIG. 1 also shows a part of the pump in vertical section. The horizontal-shaft cylindrical pump 100 is a medium- to large-sized pump, a low- to medium-lift pump, that can be used, for example, for flood countermeasures and similar countermeasures.

[0021] [Orthogonal shaft gear reducer] The horizontal shaft cylindrical pump 100 is equipped with an orthogonal shaft gear reducer 102, and the orthogonal shaft gear reducer 102 has a structure in which the inside is sealed with a body 102s. The body 102s is a component part of the orthogonal shaft gear reducer 102, and is not structurally added later. Here, as an example, the body 102s is divided into three parts when viewed in the lateral direction, but the body 102s may be of one piece type. The body 102s is, for example, bullet-shaped as a whole, and is divided into two cylindrical parts and one part whose outer shape is a truncated cone shape. The body 102s also houses an orthogonal gear (bevel gear) reduction mechanism (not shown) inside.

[0022] As an example, a front cover body 102c is provided so as to be connected to the body 102s on the upstream side of the water flow direction, and a rear cover body 102d is provided so as to be connected to the body 102s on the downstream side. The front cover body 102c has a hollow inverted truncated cone shape that widens in the lateral direction (water flow direction), while the rear cover body 102d has a hollow truncated cone shape that tapers in the lateral direction (water flow direction). It is not necessary to provide such a front cover body 102c and a rear cover body 102d.

[0023] An input shaft 102a protrudes vertically from a body 102s of the orthogonal shaft gear reducer 102, and an output shaft 102b protrudes horizontally. Both the input shaft 102a and the output shaft 102b protrude from the body 102s while being water-sealed. For this reason, in this embodiment, it is not necessary to install the orthogonal shaft gear reducer 102 in a separately provided inner body (casing) or the like. Note that since the water seal and the structure of the gear reduction mechanism are already known, illustrations and explanations thereof will be omitted here.

[0024] [Impeller] The horizontal-shaft cylindrical pump 100 also includes 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 orthogonal-shaft gear reducer 102. That is, the orthogonal-shaft gear reducer 102 and the impeller 104 form an integrated single-shaft structure, and the impeller 104 does not have its own rotating shaft, and the output shaft 102b of the orthogonal-shaft gear reducer 102 serves as the rotating shaft of the impeller 104. Therefore, in this embodiment, there is no need to connect the orthogonal-shaft gear reducer 102 and the impeller 104 with a coupling or the like, and there is no need for an independent rotating shaft for the impeller 104, so there is no need to provide bearings in front of and behind the impeller 104.

[0025] [Outer body] The horizontal-shaft cylindrical pump 100 has outer bodies 106, 108, 112, and 114, which are the only outer shells of the horizontal-shaft cylindrical pump 100. The outer bodies 106, 108, 112, and 114 are made of a circular pipe (straight pipe or tapered pipe) material, and are of an integral structure with no seams in the circumferential direction. Of these, the outer body 106 located on the most upstream (suction) side in the water flow direction surrounds part of the impeller 104 and part of the output shaft 102b integrated with it in the horizontal direction, and here, as an example, the upstream part is shaped like a suction bell. The shape of the part can be changed as appropriate.

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

[0027] In this way, the outer body 106, 108, 112, 114 is divided into a plurality of (four) parts, but is connected in the water flow direction as a whole to form an integral structure. Therefore, in this embodiment, it is not necessary to adopt a structure in which the outer body 106, 108, 112, 114 is divided into two parts, upper and lower. And, between the outer body 106, 108, 112, 114 and the body 102s and the front and rear cover bodies 102c, 102d of the orthogonal shaft gear reducer 102, water passages through which the pump pressure water flows are formed.

[0028] [Guide vane] A guide vane 110 is provided between the front cover body 102c and the inside of the front cover body 102c. In this embodiment, the impeller 104 is directly connected to the output shaft 102b of the orthogonal shaft gear reducer 102 to reduce the overall length, and the guide vane 110 is provided immediately after the impeller 104 in the water flow direction. The guide vane 110 is designed and installed with appropriate shape and dimensions to obtain a predetermined efficiency.

[0029] [Integrated structure] The outer case 112 and the body 102s of the orthogonal shaft gear reducer 102 are connected to each other by the connecting parts 102e and 102f inside the outer case 112. The connecting parts 102e and 102f are respectively arranged above and below the orthogonal shaft gear reducer 102 (body 102s), and among them, the lower connecting part 102e is fixed to the inner wall surface of the outer case 112 while supporting the orthogonal shaft gear reducer 102 including the impeller 104 of an integral structure from below. The upper connecting part 102f is fixed to the inner wall surface of the outer case 112 while supporting the orthogonal shaft gear reducer 102 including the impeller 104 from above. As a result, inside the outer cases 106, 108, 112, and 114, the impeller 104 and the orthogonal shaft gear reducer 102 are connected to the outer cases 106, 108, 112, and 114 to form an integrated structure. The input shaft 102a of the orthogonal shaft gear reducer 102 penetrates the interior of the upper connecting portion 102f and protrudes vertically (vertically upward) from the outer case 112. Therefore, the connecting portion 102f also has a structure that allows the input shaft 102a to penetrate its interior while being water-sealed.

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

[0031] Second Embodiment Fig. 2 is a diagram showing a structural example of a horizontal-shaft cylindrical pump 200 according to a second embodiment. In Fig. 2, (A) is a front view seen in the water flow direction, (B) is a side view with a part cut away, and (C) is a rear view. Here, too, when the horizontal-shaft cylindrical pump 200 is viewed in an installed state, the direction of the X-axis shown in the figure is the lateral direction (horizontal direction), the direction of the Z-axis is the longitudinal direction (vertical or perpendicular direction), and the direction of the Y-axis is the width direction. The rest is the same as in the first embodiment.

[0032] [Orthogonal shaft gear reducer] Similarly, in the second embodiment, the horizontal shaft cylindrical pump 200 includes an orthogonal shaft gear reducer 202, and the orthogonal shaft gear reducer 202 also has a structure in which the inside is sealed with a body 202s. Here, too, the body 202s is a component part of the orthogonal shaft 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 part on the upstream side in the water flow direction is an inverted truncated cone shape, and the part connected to this is cylindrical, but this example is not limiting. The body 202s also houses an orthogonal gear (bevel gear) reduction mechanism (not shown) inside.

[0033] As an example, here, a front cover body 202c is provided so as to be connected to the body 202s on the upstream side of the water flow direction, and a rear cover body 202d is provided so as to be connected to the body 202s on the downstream side. Of these, the front cover body 202c has a cylindrical shape, while the rear cover body 202d has a hollow truncated cone shape tapered in the lateral direction (water flow direction). It is not necessary to provide such a front cover body 202c and a rear cover body 202d.

[0034] An input shaft 202a protrudes vertically from a body 202s of the orthogonal shaft gear reducer 202, and an output shaft 202b protrudes horizontally. The body 202s allows both the input shaft 202a and the output shaft 202b to protrude in a water-sealed state. Therefore, similarly to the second embodiment, the orthogonal shaft gear reducer 202 does not need to be installed in a separately provided inner body (casing) or the like.

[0035] [Impeller] The horizontal-shaft cylindrical pump 200 also includes an impeller 204. Here, too, the impeller 204 is directly supported by the output shaft 202b of the orthogonal-shaft gear reducer 202. That is, here too, the orthogonal-shaft gear reducer 202 and the impeller 204 form an integrated single-shaft structure, and the impeller 204 does not have an independent rotating shaft, and the output shaft 202b of the orthogonal-shaft gear reducer 202 directly serves as the rotating shaft of the impeller 204. Although not shown, 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 orthogonal-shaft gear reducer 202 and the impeller 204 with a coupling or the like, and there is no need for an independent rotating shaft for the impeller 204, so there is no need to provide bearings in front of and behind the impeller 204.

[0036] [Outer body] The horizontal-shaft cylindrical pump 200 of the second embodiment includes outer bodies 206, 208, 212 having a cylindrical shape as a whole, and an outer body 214 having a hollow truncated cone shape as a whole, and these outer bodies 206, 208, 212, 214 are the only outer shells of the horizontal-shaft cylindrical pump 200. The outer bodies 206, 208, 212 are made of a circular pipe (straight pipe) material, and have an integral structure with no seams due to division in the circumferential direction. The outer body 214 is made of a tapered pipe material, and similarly has an integral structure with no seams due to division in the circumferential direction. Of these, the outer body 206 located on the most upstream (suction) side in the water flow direction surrounds the impeller 104 and a part of the output shaft 202b integrated with it.

[0037] Next, the outer body 208, which is connected in the water flow direction, surrounds a part of the orthogonal shaft gear reducer 202 (particularly the part of the front cover body 202c) and has a cylindrical shape that matches the shape of the front cover body 202c. Next, the outer body 212, which is connected in the water flow direction, surrounds a part of the orthogonal shaft gear reducer 202 and has a cylindrical shape that matches the cylindrical part of the inner body 202s, and exposes the input shaft 202a to the outside in the vertical direction (vertically upward direction). Then, the outer body 214, which is located on the most downstream (discharge) side in the water flow direction, surrounds the rear cover body 202d and has a hollow truncated cone 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 in the figure. Also, the outer body 214 is not shown in FIG. 2(c).

[0038] In this way, in the second embodiment, the outer body 206, 208, 212, 214 is also divided into multiple (three) parts, but is connected in the water flow direction as a whole to form an integrated structure. Therefore, in the second embodiment, it is not necessary to adopt a structure in which the outer body 206, 208, 212, 214 is divided into two parts, upper and lower. And, between the outer body 206, 208, 212, 214 and the body 202s and the front and rear cover bodies 202c, 202d of the orthogonal shaft gear reducer 202, water passages through which the pump pressure water flows are formed.

[0039] [Guide vane] A guide vane 210 is provided between the front cover body 202c and the inside of the front cover body 202c. In the second embodiment as well, the impeller 204 is directly connected to the output shaft 202b of the orthogonal shaft gear reducer 202 to reduce the overall length, and the guide vane 210 is provided immediately after the impeller 204 in the water flow direction, and the shape and dimensions of the guide vane 210 are appropriately designed and installed to obtain a predetermined efficiency.

[0040] [Integrated structure] Similarly, in the second embodiment, the outer case 212 and the body 202s of the orthogonal shaft gear reducer 202 are connected to each other by connecting parts 202e and 202f inside the outer case 212. The connecting parts 202e and 202f are disposed above and below the orthogonal shaft gear reducer 202 (body 202s), respectively, and of these, the lower connecting part 202e is fixed to the inner wall surface of the outer case 212 while supporting the orthogonal shaft gear reducer 202 including the integrally structured impeller 204 from below. The upper connecting part 202f is fixed to the inner wall surface of the outer case 212 while supporting the orthogonal shaft gear reducer 202 including the impeller 204 from above. As a result, inside the outer cases 206, 208, 212, 214, the impeller 204 and the orthogonal shaft gear reducer 202 are interconnected to the outer cases 206, 208, 212, 214 to form an integrated structure. The input shaft 202a of the orthogonal shaft gear reducer 202 penetrates the interior of the upper connecting portion 202f and protrudes vertically (vertically upward) from the outer case 212. Therefore, the connecting portion 202f also has a structure that allows the input shaft 202a to penetrate through its interior while being water-sealed.

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

[0042] [Comparison with conventional models] Fig. 3 is a diagram showing a comparison between a horizontal-shaft cylindrical pump 200 of this embodiment (hereinafter referred to as the second embodiment) and a conventional pump. In Fig. 3, (A) is a schematic diagram of the horizontal-shaft cylindrical pump 200 of this embodiment, (B) is a schematic diagram of a horizontal-shaft cylindrical pump 300 of a first comparative example (conventional type 1), and (C) is a schematic diagram of a horizontal-shaft cylindrical pump 400 of a second comparative example (conventional type 2). Here, the comparison is mainly shown in terms of the length dimension in the horizontal direction (water flow direction). A specific explanation will be given below.

[0043] [Present embodiment] FIG. 3(A): As described above, the present embodiment employs the orthogonal shaft gear reducer 202, and by connecting the driving machine 220 such as a motor to the input shaft 202a protruding vertically upward, the driving machine 220 can be installed at a higher position. Accordingly, there is no need to secure a space for installing the driving machine 220 in the lateral direction, and the overall length dimension L1 is kept short. In addition, since the orthogonal shaft gear reducer 202 and the impeller 204 have a single-shaft structure integrated with each other, there is no need to connect anything like a rotating shaft to the output shaft 202b, and therefore the length dimension L1 is kept short accordingly, and no installation space is required for couplings, bearings, etc., and the number of parts is reduced. In addition, by providing the guide vanes 210 on the inside of the outer body 208 immediately after the impeller 204, the desired efficiency of the pump can be obtained. Furthermore, since the pump body has a single-layer structure of the outer bodies 206, 208, 212, and 214, the diameter dimension D1 can also be kept small.

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

[0045] [First Comparative Example (Conventional Type 1)] In Fig. 3B, a horizontal shaft cylindrical pump 300 of conventional type 1, which is a first comparative example, is equipped with a gear reducer 302 and an impeller 304, but the impeller 304 has its own rotating shaft 318. In addition, since the gear reducer 302 does not have an orthogonal shaft, a driving machine 312 such as a motor must be disposed behind the gear reducer 302. An input shaft 302a of the gear reducer 302 and an output shaft 312a of the driving machine 312 are connected via a coupling 320, and a rotating shaft 318 of the impeller 304 and an output shaft 302b of the gear reducer 302 are 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 location of the rotating shaft 318 exposed to water. The rotating shaft 318, bearings 322, gear reducer 302, coupling 320, driver 312, etc. are installed inside the inner bodies 330, 332, and these and the impeller 304 are all surrounded by the outer bodies 306, 308, 310, resulting in a long overall length dimension L2. Furthermore, because of the double casing structure of the inner bodies 330, 332 and the outer bodies 306, 308, 310, the diameter dimension D2 of the rotating shaft 318 is also large (see page 5 of Non-Patent Document 1).

[0046] [Second Comparative Example (Conventional Type 2)] 3C: A conventional type 2 horizontal shaft cylindrical pump 400, which is a second comparative example, includes a gear reducer 402 and an impeller 404, but the impeller 404 does not have its own rotating shaft, and the impeller 404 is connected to an output shaft 402b of the gear reducer 402. However, since the gear reducer 302 does not have an orthogonal shaft, a driving machine 412 such as a motor must be disposed behind the gear reducer 402, and an input shaft 402a of the gear reducer 402 and an output shaft 412a of the driving machine 412 are connected via a coupling 420. In addition, a water seal 424 and the like are disposed on the output shaft 402b of the gear reducer 402 at a location exposed to water. The gear reducer 402, coupling 420, driver 412, etc. are installed inside the inner bodies 430, 432, and these and the impeller 404 are all surrounded by the outer bodies 406, 408, 410, so the overall length dimension L3 is also long.In addition, because of the double casing structure of the inner bodies 430, 432 and the outer bodies 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] [Comparison Summary] (1) In both the first and second comparative examples, the overall length dimensions L2, 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, and the overall size is reduced. This is the same for the first embodiment (and the same below).

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

[0049] (3) Therefore, when the horizontal shaft cylindrical pumps 100, 200 of the present embodiment are installed in an actual pumping station, the structure of the pumping station can be made small-scale to match the miniaturization of the pumps. In contrast, the pumping station would be extremely large if a conventional pump were used (see pages 6-7 of Non-Patent Document 1).

[0050] (4) According to a verification conducted by the inventor of the present invention, it has become clear 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%. It has also become clear that the construction period for pump installation can be shortened to 1 / 3 to 1 / 5 that of the conventional type. As a reference example, the period required for the installation work of four conventional large tubular pumps is about five months, whereas the installation work can be completed in about one month in this embodiment.

[0051] (5) Furthermore, the horizontal-shaft cylindrical pumps 100, 200 of the present embodiment have a simple structure, which is advantageous in that they are easier to disassemble and inspect than conventional pumps.

[0052] In this way, the horizontal shaft cylindrical pumps 100, 200 of the present embodiment are more useful and reliable, and are also extremely beneficial from the perspective of the SDGs, which will attract attention in the future.

[0053] [Installation example] 4A and 4B are diagrams showing an example of installation of a horizontal-shaft cylindrical pump 200 according to this embodiment (hereinafter referred to as a second embodiment), in which (A) is a plan view and (B) is an elevation view.

[0054] For example, a plurality of horizontal-shaft cylindrical pumps 200 of this embodiment can be arranged and installed at a pump station provided in a river RV. A maintenance and installation workshop YD is constructed on the bank of the river RV, and the horizontal-shaft cylindrical pumps 200 are carried into the workshop YD by a truck TK or the like. A plurality of pump installation pits PT partitioned by partition walls WL in the river width direction from a retaining wall FC are constructed in parallel arrangement inside the river RV, and the horizontal-shaft cylindrical pumps 200 are installed in each of the pits PT. At this time, the horizontal-shaft cylindrical pumps 200 can be carried into the workshop YD in a completed state and temporarily placed there, so that the work of installing them in each pit PT can be easily performed from there.

[0055] Another advantage of using the orthogonal shaft gear reducer 202 is that the driving machine 220 such as a motor can be installed at a higher position, as shown in Fig. 4(B), to avoid flood damage in the event of an accident. This is particularly important in countries and regions with a lot of rainfall, in the sense that the driving machine 220 can be prevented from being submerged due to rising water levels in the river RV. In addition, the power supply to the driving machine 220 and the wiring for the sensors are all normal land-based wiring, so installation is simple and easy, and the electrical system is safe.

[0056] Furthermore, by adopting the orthogonal axis gear reducer 202, it is possible to make it an integral structure with the outer casings 206, 208, 212, 214 that form the water passages, and it is not necessary to make it a horizontally split casing like conventional products (see pages 3 and 6 of Non-Patent Document 1), allowing for a simple structure.

[0057] In this regard, with conventional pumps, the entire pump must be transported to the pumping station in a disassembled state, and the lower part of the outer body, which has a horizontally split structure, must be installed first. Then, the drive unit, gear reducer, bearings, rotating shaft, coupling, etc. must be installed in the inner body. After that, the joint with the lower part of the outer body is carefully sealed and the upper part of the outer body is used to cover it, and the entire pump must be completed on site. This requires a lot of labor and fine adjustments, and takes a great deal of time and effort; however, this embodiment can eliminate such problems.

[0058] The above are advantages in the case of taking the horizontal-shaft cylindrical pump 200 of the second embodiment as an example, but the horizontal-shaft cylindrical pump 100 of the first embodiment also has similar advantages.

[0059] The present invention is not limited to the above-described embodiment, and can be practiced in various modified forms. The structures described in the various embodiments are merely examples, and the detailed structure can be appropriately modified depending on the conditions and environment in which the pump is used.

[0060] The horizontal shaft cylindrical pumps 100, 200 can be used not only for flood control but also for other purposes. In addition, the numerical values ​​given are merely examples and are not limited to those values. [Explanation of symbols]

[0061] 100,200 Horizontal shaft cylindrical pump 102,202 Right-angle gear reducer 102a, 202a Input shaft 102b, 202b Output shaft 104,204 Impeller 110,210 Guide wing 106,108,112,114 Outer body 206,208,212,214 Outer body

Claims

1. an orthogonal shaft gear reducer having an input shaft protruding vertically and an output shaft protruding horizontally from a body that seals the inside; An impeller directly supported on an output shaft of the orthogonal shaft gear reducer; A guide vane for rectifying the pressurized water produced by the impeller; a cylindrical outer shell that surrounds the impeller, the guide vanes, and the orthogonal shaft gear reducer, forms a water passage for flowing pressurized water between the outer shell and a body of the orthogonal shaft gear reducer, and exposes an input shaft of the orthogonal shaft gear reducer to the outside while sealing the inside of the outer shell; A horizontal shaft cylindrical pump equipped with a

2. 2. The horizontal shaft cylindrical pump according to claim 1, The outer shell is made of a circular tube material having no seams in the circumferential direction, 13. A horizontal shaft cylindrical pump, comprising: a first pump body and a second pump body, the first pump body being connected to the first pump body;

3. 3. The horizontal shaft cylindrical pump according to claim 1, a horizontal shaft cylindrical pump, characterized in that the overall lateral length of the outer body is configured to be the combined length of at least a section surrounding the impeller and the guide vanes and a section surrounding the orthogonal shaft gear reducer.

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