JP4614786B2 - Pump structure - Google Patents

Description

  The present invention relates to a pump structure and relates to a pump technology used for general water supply such as rainwater drainage and sewage water supply.

  Conventionally, there is a vertical shaft pump, for example, as a pump used in a drainage station or the like, and the vertical shaft pump is generally installed suspended from the pump installation floor surface in order to easily pull it up during disassembly and inspection. This structure is, for example, as shown in FIG. The vertical shaft pump 1 is suspended from the pump installation floor 2 and disposed in the suction water tank 3. The pump shaft 6 is connected to the bevel gear speed reducer 5 disposed on the drive machine installation floor 4, and the bevel gear speed reducer 5 is connected to the internal combustion engine. 7 is connected. In this case, the load of the vertical shaft pump 1 acts on the pump installation floor 2, and the loads of the bevel gear reducer 5 and the internal combustion engine 7 act on the drive installation floor 4.

  Further, as shown in FIG. 4B, the vertical pump 1 is suspended from the pump installation floor 2 and disposed in the suction water tank 3, and the bevel gear speed reducer 5 is installed at the upper end of the vertical pump 1. There is a structure in which the load of the bevel gear reducer 5 and the internal combustion engine 7 is supported by the pump installation floor 2.

  However, in the existing drainage station etc., when the pump is renewed due to aging of the main pump, lack of capacity, etc., the increase in the pump weight accompanying the enhancement of the pump capacity will increase the load acting on the pump installation floor 2 .

For this reason, there exists some which are disclosed by patent document 1, for example in order to reduce the pump load which acts on a pump installation floor. This is a pull-out type vertical shaft pump installed in a water absorption tank, and is equipped with an impeller, a casing liner, a guide vane casing, a discharge diffuser, and a pump hydraulic unit including a pump shaft, and a discharge casing for storing the pump hydraulic unit The suction bell mouth, the suction casing, and the discharge casing are fixed to the water absorption tank.
Japanese Patent Laid-Open No. 11-159491

  However, in the configuration described above, since the load of the suction bell mouth, the suction casing and the discharge casing is applied to the floor of the water tank through the suction bell mouth, a large load acts on the suction bell mouth. The strength of the suction bell mouth as a structural material that supports the load of the suction casing and the discharge casing is required. In addition, since the suction bell mouth, the suction casing, and the discharge casing have a continuous structure, the pump hydraulic part is necessarily housed in the discharge casing. It becomes an increase factor. Moreover, if the pump hydraulic power unit has a structure commensurate with the required capacity, the discharge casing needs to be formed excessively larger.

  The present invention solves the above-described problems, and can reduce or eliminate the load acting on the existing pump installation floor, and pulls up the main part of the pump including the suction bell mouth and the impeller integrally. An object of the present invention is to provide a pump structure capable of

  In order to solve the above-described problems, the pump structure of the present invention is formed by dividing a main body casing forming a fluid passage into a discharge-side fixed casing and a suction-side movable casing including a suction bell mouth, and via a support member. A fixed casing is supported by the bottom surface of the aquarium, and a movable casing arranged at the lower end of the fixed casing is suspended and supported by a suspension member so that it can be pulled out upward through the fixed casing, and an impeller arranged in the movable casing is pumped. The suspension is supported by a shaft, the movable casing is supported by the fixed casing via the suspension member, and the load of the fixed casing and the movable casing is supported by the support member on the bottom surface of the aquarium. Supports the impeller load and hydraulic thrust via the pump shaft, and reduces it connected to the pump shaft. It is intended to support the load of the machine.

  In the pump structure of the present invention, the main body casing forming the fluid passage is divided and formed into a discharge-side fixed casing and a suction-side movable casing including a suction bell mouth, and the fixed casing is supported on the bottom surface of the water tank via a support member. The movable casing arranged at the lower end of the fixed casing is suspended and supported by the suspension member, and is provided so as to be able to be pulled out upward through the fixed casing. The impeller disposed in the movable casing is suspended and supported by the pump shaft. The movable casing is supported by the fixed casing via the member, the impeller is supported by the fixed casing via the pump shaft, and the load of the fixed casing, the movable casing, the impeller and the hydraulic thrust are supported via the support member on the bottom surface of the water tank. Supporting the load of the speed reducer connected to the pump shaft on a floor surface different from the tank bottom surface It is.

  In the pump structure of the present invention, the main body casing forming the fluid passage is divided and formed into a discharge-side fixed casing and a suction-side movable casing including a suction bell mouth, and the fixed casing is supported on the bottom surface of the water tank via a support member. The movable casing arranged at the lower end of the fixed casing is suspended and supported by the suspension member, and is provided so as to be able to be pulled out upward through the fixed casing. The impeller disposed in the movable casing is suspended and supported by the pump shaft. The movable casing is supported by the fixed casing via the member, the impeller is supported by the fixed casing via the pump shaft, and the load of the fixed casing, the movable casing, the impeller and the hydraulic thrust are supported via the support member on the bottom surface of the water tank. Moreover, the load of the reduction gear connected with a pump shaft is supported.

  In the pump structure of the present invention, a steadying member is disposed around the fixed casing, and the steadying member is fixedly installed on a floor surface different from the bottom of the water tank.

  As described above, according to the present invention, in the pump structure in which the main casing including the suction bell mouth, the impeller, the pump shaft, and the speed reducer are the main constituent members and the suction bell mouth and the impeller are pulled up integrally, the suction bell mouth Without supporting the pump load, the pump load is supported in a distributed manner on the bottom surface of the aquarium and the existing pump installation floor, which is a different floor from the bottom surface of the aquarium, or on the bottom surface of the aquarium. Thus, the load acting on the existing pump installation floor can be reduced or eliminated. Therefore, the pump can be renewed to increase the target capacity even in a machine place where there is a concern about the load resistance evaluation of the existing pump installation floor. Further, the lateral vibration of the pump can be suppressed by the steadying member.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, the vertical shaft pump 11 sequentially arranges a bowl portion 14, a body portion 15, an outer frame 16, and a speed reducer 17 from the suction water tank bottom plate surface 12 side toward the pump installation floor surface 13 side. A drive (not shown) is connected to the speed reducer 17.

  A main body casing 18 forming a fluid passage is composed of a suction bell mouth 19 and a pump casing 20 which are arranged in the bowl portion 14 as a movable casing on the suction side, and a pumping pipe which is arranged in the trunk portion 15 as a fixed casing on the discharge side. 21 and divided.

  Further, the bowl portion 14 is provided with a guide vane 22 fixed inside the pump casing 20 and an impeller 24 rotatably arranged inside the suction bell mouth 19 forming the suction port 23. Further, a bend guide 26 that guides the pumped water to the discharge port 25 inside the pumping pipe 21 and a lid body 27 that closes the upper end opening of the pumped pipe 21 are disposed in the body portion 15.

  The pumping pipe 21 is supported by the aquarium bottom surface 12 through support legs 28 that form a supporting member, and the suction bell mouth 19 and the pump casing 20 disposed at the lower end of the pumping pipe 21 are connected via a shaft cover 29 that forms a suspension member. The lid 27 is suspended and supported so that it can be pulled upward through the pumping pipe 21.

  The impeller 24 is suspended and supported by a pump shaft 30, and the pump shaft 30 reaches the inside of the outer frame 16 through the shaft cover 29, and is connected to the speed reducer 17 through the shaft coupling 31 a. It is supported by the pump installation floor 13 through the frame 16. The pump shaft 30 is held in a watertight manner by a shaft seal portion 32 provided on the lid 27 and is rotatably supported by a thrust bearing 33 provided on the outer frame 16. The thrust bearing 33 can also be provided inside the speed reducer 17.

  The bend guide 26 is fixed to the shaft cover 29 and provided so as to be able to be pulled out together with the suction bell mouth 19 and the pump casing 20. Further, the pump installation floor 13 is provided with an annular steady plate 35 that forms a steady member surrounding the flange 34 provided around the pumping pipe 21, and the steady plate 35 suppresses the lateral vibration of the pump. is doing.

  With the above-described configuration, the pumping pipe 21 supports the suction bell mouth 19, the pump casing 20, and the guide blade 22 through the shaft cover 29 and the lid body 27, and the pumping pipe 21 is supported by the support legs 28, so that these The load of the member is applied to the bottom surface 12 of the suction water tank.

  In addition, the outer frame 16 supports the impeller 24 through the thrust bearing 33, the shaft coupling 31a, and the pump shaft 30, and supports the speed reducer 17, whereby the load of these members and the rotation of the impeller 24 The generated hydraulic thrust is applied to the pump installation floor 13 which is a floor different from the suction water tank bottom 12.

  During maintenance of the impeller 24 and the like, the connection between the speed reducer 17 and the pump shaft 30 in the shaft coupling 31a is released, the outer frame 16 and the speed reducer 17 are removed, and the fastening between the lid 27 and the pumping pipe 21 is released. Thus, the suction bell mouth 19, the pump casing 20, and the impeller 24 are integrally lifted by pulling up the shaft cover 29 and the pump shaft 30.

  Therefore, in the pump structure in which the suction bell mouth 19 and the impeller 24 are pulled up integrally, the pump load is distributedly supported by the suction water tank bottom surface 12 and the pump installation floor surface 13 without applying a pump load to the suction bell mouth 19. By doing, the load which acts on the pump installation floor 13 can be reduced. Therefore, the pump can be renewed to increase the target capacity even in a machine place where there is a concern about the load resistance evaluation of the existing pump installation floor.

  FIG. 2 shows another embodiment of the present invention. Constituent members that perform the same operations as those of the previous embodiment are denoted by the same reference numerals and description thereof is omitted. In this configuration, the pump shaft 30 is supported by a thrust bearing 33 disposed between the shaft coupling 31 and the lid body 27, and the thrust bearing 33 is supported by a gantry 36 provided on the lid body 27. The shaft coupling 31b has a structure that allows the pump shaft 30 to move in the axial direction and does not receive a load, and transmits torque around the axial center.

  With this configuration, the pumping pipe 21 supports the suction bell mouth 19, the pump casing 20, and the guide vane 22 through the shaft cover 29 and the lid body 27, and the support legs 28 support the pumping pipe 21, so that these members are supported. Is applied to the bottom surface 12 of the suction tank.

  Further, since the gantry 36 supports the impeller 24 via the thrust bearing 33 and the pump shaft 30, the hydraulic thrust generated by the load of these members and the rotation of the impeller 24 is transmitted via the pumping pipe 21 and the support leg 28. To the bottom surface 12 of the suction tank. The load of the speed reducer 17 is applied to the pump installation floor surface 13, which is a floor surface different from the suction water tank bottom panel surface 12, via the outer frame 16.

  FIG. 3 shows another embodiment of the present invention. Constituent members that perform the same operations as those of the previous embodiment are denoted by the same reference numerals and description thereof is omitted. In this configuration, the pump shaft 30 is supported by a thrust bearing 33 disposed between the shaft coupling 31 b and the lid body 27, the thrust bearing 33 is supported by the mount 36 provided on the lid body 27, and the speed reducer 17 is provided. The outer frame 16 to be supported is integrated with the gantry 36 and supported by the pumping pipe 21.

  With this configuration, the pumping pipe 21 supports the suction bell mouth 19, the pump casing 20, and the guide vane 22 through the shaft cover 29 and the lid body 27, and the support legs 28 support the pumping pipe 21, so that these members are supported. Is applied to the bottom surface 12 of the suction tank.

  Further, since the gantry 36 supports the impeller 24 via the thrust bearing 33 and the pump shaft 30, the hydraulic thrust generated by the load of these members and the rotation of the impeller 24 is transmitted via the pumping pipe 21 and the support leg 28. The load of the speed reducer 17 is applied to the suction water tank bottom board surface 12 through the outer frame 16, the gantry 36, the pumping pipe 21, and the support legs 28. Therefore, the pump load is not applied to the pump installation floor 13.

Sectional drawing of the vertical shaft pump which shows embodiment of this invention Sectional drawing of the vertical shaft pump which shows other embodiment of this invention Sectional drawing of the vertical shaft pump which shows other embodiment of this invention (A), (b) is a schematic diagram showing the arrangement structure of a conventional vertical shaft pump, respectively

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Vertical shaft pump 12 Bottom surface of suction tank 13 Floor surface of pump installation 14 Bowl part 15 Body part 16 Outer frame 17 Reduction gear 18 Main body casing 19 Suction bell mouth 20 Pump casing 21 Pumping pipe 22 Guide blade 23 Suction port 24 Impeller 25 Discharge port 26 Bend Guide 27 Lid 28 Support Leg 29 Shaft Cover 30 Pump Shaft 31a Shaft Coupling 31b Shaft Coupling 32 Shaft Sealing Portion 33 Thrust Bearing 34 Flange Portion 35 Stabilizing Plate

Claims (4)

The main body casing forming the fluid passage is divided into a discharge-side fixed casing and a suction-side movable casing including a suction bell mouth, and the fixed casing is supported on the bottom surface of the water tank via a support member. The movable casing to be arranged is suspended and supported by the suspension member, and is provided so as to be able to be pulled out upward through the fixed casing. The impeller disposed in the movable casing is suspended and supported by the pump shaft, and the movable casing is supported via the suspension member. In addition to supporting the fixed casing and the movable casing through the support member on the bottom surface of the water tank, and supporting the load of the impeller and the hydraulic thrust through the pump shaft on a floor surface different from the bottom surface of the tank. A pump structure characterized by supporting a load of a reduction gear connected to the pump shaft. The main body casing forming the fluid passage is divided into a discharge-side fixed casing and a suction-side movable casing including a suction bell mouth, and the fixed casing is supported on the bottom surface of the water tank via a support member. The movable casing to be arranged is suspended and supported by the suspension member, and is provided so as to be able to be pulled out upward through the fixed casing. The impeller disposed in the movable casing is suspended and supported by the pump shaft, and the movable casing is supported via the suspension member. The fixed casing supports the impeller with the fixed casing via the pump shaft, and supports the load and the hydraulic thrust of the fixed casing, the movable casing, the impeller through the support member on the bottom of the tank. A pump structure characterized by supporting a load of a speed reducer connected to the pump shaft on a different floor surface . The main body casing forming the fluid passage is divided into a discharge-side fixed casing and a suction-side movable casing including a suction bell mouth, and the fixed casing is supported on the bottom surface of the water tank via a support member. The movable casing to be arranged is suspended and supported by the suspension member, and is provided so as to be able to be pulled out upward through the fixed casing. The impeller disposed in the movable casing is suspended and supported by the pump shaft, and the movable casing is supported via the suspension member. Support with fixed casing, support impeller with fixed casing via pump shaft, load on fixed casing, movable casing, impeller and hydraulic thrust and hydraulic thrust through pumping support member on bottom surface of tank Pump structure characterized by supporting the load of the machine. The pump structure according to any one of claims 1 to 3, wherein a steady member is disposed around the fixed casing, and the steady member is fixedly installed on a floor surface different from the bottom surface of the water tank.

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