JP5997483B2 - Pump device with rectifying cover and rectifying cover - Google Patents

Description

  The present invention relates to a pump device or the like provided with a rectifying cover.

  In recent years, rainwater tends to flow into a water tank of a pump facility rapidly and in large quantities due to improvement of the pavement rate due to urbanization and residential land development in urban areas and the spread of sewer pipes. However, it may be economically difficult to install a water tank having a capacity sufficient to allow a large amount of rainwater to flow in because the land is expensive. As a result, the capacity of the water absorption tank is insufficient, and the water level is likely to cause a drastic change. A pull-out type pump device is widely used as an example of a pump that removes rainwater from the water tank.

  In addition, when a large amount of rain due to a natural disaster such as a typhoon does not sufficiently drain rainwater, there is a risk of flooding in lowlands, etc., so that a pull-out pump device can be used to quickly drain the water. Is used.

  As a publicly known technique of the publication of the pull-out type pump device, for example, there is a technique disclosed in Patent Document 1.

  FIG. 1 is a view for explaining a conventional pump device 500 having a configuration in which a pump unit 504 is inserted into a column pipe 502. A sole plate 532 is attached to the lower part of the column pipe 502 attached so as to be immersed in the pumped water reservoir, and the pump unit 504 is fixed on the sole plate 532. The pump unit 504 includes a discharge bowl 534 provided with guide vanes for guiding the pumped liquid discharged from the impeller 526 in the axial direction into the column pipe 502, a suction bell 536 attached to the lower part thereof, and an upper part thereof. The motor 516 is composed of main components such as an impeller 526 attached to the shaft of the motor 516. In addition, a power cable 510 is attached to the upper part of the motor 516 and passes through the column hatch 512 of the pumped water pipe 502, and is pulled out to the outside. A mechanical seal 538 is attached to the lower part of the motor 516. This prevents the pumped liquid from entering the motor chamber. A bulging portion 540 is formed on the outer peripheral portion of the discharge bowl 534 at a mounting position with the sole plate 532, and the mounting surface between the outer surface of the bulging portion 540 and the sole plate 532 is with respect to the pump shaft core. It is formed in a conical shape with a certain angle.

  Moreover, there is also a technique disclosed in Patent Document 2 as a publication technique related to a pumping device using a submersible motor pump that is suspended in water and performs pumping work.

  In a liquid pumping device in which a submersible motor pump unit is detachably mounted in a fixed outer casing, the lower end of the suspension pipe is fixed to the upper part of the submersible motor pump unit, and the upper end of the suspension pipe is supported by the upper part of the outer casing. In addition, there is disclosed a technique in which a cable leading to a motor and a cable gland are positioned in a suspension pipe.

  Furthermore, there is also a technique disclosed in Patent Document 3 as a publication technique that enables continuous operation without causing the submersible motor pump to be damaged by heating even in the idling state.

  A plurality of radiating fins are projected from the motor frame in parallel with the water flow into the flow path between the outer peripheral wall of the motor frame of the submersible motor pump and the inner peripheral wall of the column pipe. A technique for providing an air valve for forming an air flow path in an idle state in a column hatch is disclosed.

Japanese Utility Model Publication No. 60-32599 JP 58-138293 A Japanese Patent No. 2632466

  By the way, a general pull-out submersible motor pump is a cylindrical type having a flat end surface on the downstream side of the motor unit, and a hanging jig, a power cable connector, and the like are arranged in a complicated manner on the end surface. When the pump device is operated with the submersible motor pump installed in the column pipe and fluid flows, fluid separation occurs on the downstream side of the motor unit, and a vortex is generated. Due to this vortex, the fluid transfer efficiency is reduced, and cavitation occurs in the pump device, which causes noise.

  The present invention has been made to solve the above problems, and the problem is that the fluid transfer is prevented by preventing the separation of fluid and the generation of vortices that occur downstream of the motor section of the submersible motor pump. It is an object of the present invention to provide a pump device and the like that can reduce cavitation and noise with little reduction in efficiency.

  Hereinafter, means for solving the above-mentioned problems will be described. In order to facilitate understanding of the present invention, reference numerals in the accompanying drawings are added in parentheses, but the present invention is not limited to the illustrated embodiment.

  In order to solve the above problems, a pull-out type pump device (100, 200, 300) includes a column pipe (102, 202, 302) and a submersible motor pump (104, 204, 304) disposed in the column pipe. A rectifying cover (106, 206, 306) attached to the submersible motor pump, the rectifying cover (106, 206, 306) having an outer shape continuous with the frame of the submersible motor pump at the attachment position.

  Here, if the rectifying cover is characterized in that the outer shape of the rectifying cover becomes smaller toward the downstream of the flow, separation of the flow can be suppressed.

  Further, if the rectifying cover is formed of at least one of a metal material, a polymer material, and a ceramic material, corrosion resistance can be secured and heat generated by the motor can be conducted to the outside. .

  Furthermore, it further has a discharge pipe (122) connected perpendicularly to the column pipe on the downstream side of the submersible motor pump, and the rectifying cover has a downstream end of the rectifying cover connected to the submersible motor pump from the central axis of the discharge pipe. If it is characterized by being formed so as to be closer, the effective cross-sectional area of the flow path can be ensured.

  Furthermore, the protection pipe that houses and protects at least one of the power cable and the hanging wire, and further includes a protection pipe attached to the downstream end of the rectifying cover. The entanglement is eliminated and the flow can be made smoother.

Furthermore, it further has a discharge pipe connected perpendicularly to the column pipe on the downstream side of the submersible motor pump. If it is characterized by being formed to be smaller than the outer diameter of the cover, the effective cross-sectional area of the flow path can be ensured.

  In order to solve the above problems, a pull-out pump device (300) includes a column pipe (302), a submersible motor pump (304) disposed in the column pipe, and a flow between the column pipe and the submersible motor pump. A rectifying cover (306) attached to the submersible motor pump on the downstream side of the rectifying cover, the rectifying cover having an extension part (318) extended on the downstream side of the rectifying cover, and the extension part being a power cable ( 310) and / or the suspension wire (314) is housed and protected.

  In order to solve the above problems, the rectifying covers (106, 206, 306) are rectifying covers attached to the submersible motor pumps (104, 204, 304) disposed in the column pipes (102, 202, 302). And an outer shape that is continuous with the frame of the submersible motor pump at the mounting position.

  According to the present invention having the above configuration, fluid separation and vortex generation that occur downstream of the motor unit of the submersible motor pump are prevented, so that there is little decrease in fluid transfer efficiency, and cavitation and noise can be prevented. .

It is a figure explaining the conventional pump apparatus which has the structure by which the submersible motor pump was inserted in the column pipe. It is a figure which shows the pull-out type pump apparatus which has a submersible motor pump in which the rectifying cover is not attached. It is a figure which shows the mode of the eddy which generate | occur | produces in the flame | frame downstream side of the motor part of FIG. It is a figure which shows the pump apparatus which has a submersible motor pump with which the rectification | straightening cover which concerns on 1st Embodiment was attached. It is an enlarged view which shows the structure around the rectifying cover of the pump apparatus which has a rectifying cover which concerns on 2nd Embodiment. It is a figure which shows the pump apparatus which has a submersible motor pump with which the rectification | straightening cover which concerns on 3rd Embodiment was attached.

  First, a conventional pull-out type pump device will be described. FIG. 2 is a diagram showing a pull-out type pump device 600 having a configuration in which a submersible motor pump 604 not attached with a rectifying cover is fixed in a column pipe 602.

  As shown in FIG. 2, the pump device 600 includes a column pipe 602 and a submersible motor pump 604 disposed in the column pipe 602. The discharge pipe 622 is connected orthogonally to the column pipe 602 on the downstream side of the submersible motor pump 604. The submersible motor pump 604 has a motor portion 616 that is covered with a cylindrical frame and has a substantially cylindrical shape. The downstream end of the submersible motor pump 604 has a flat end surface, and a hanging jig 608, a connector 609 of the power cable 610, and the like are disposed. The pump device 600 includes a water inlet 620 on the upstream side of the submersible motor pump 604.

When the pump device 600 having such a configuration is started, fluid is taken into the pump device 600 from the water inlet 620 by the impeller 626 attached to the upstream end of the submersible motor pump 604. The fluid passes through the flow path 624 between the column pipe 602 and the submersible motor pump 604, and is discharged from the discharge pipe 622 with the direction changed by 90 ° on the downstream side of the column pipe 602.

  Since the frame of the motor unit 616 is not a streamline shape that narrows toward the downstream side, but has a cylindrical shape with the same outer diameter in the axial direction, the fluid is separated and a vortex is generated on the downstream side of the frame. FIG. 3 is a diagram illustrating a state of vortices generated on the downstream side of the frame of the motor unit 616 in FIG. 2. When the fluid is separated and a vortex is generated in the flow, the fluid transfer efficiency decreases. In addition, the generation of vortices causes cavitation and noise.

  Next, a pull-out type pump device having a submersible motor pump to which a rectifying cover according to this embodiment is attached will be described. FIG. 4 is a view showing the pull-out type pump device 100 having the submersible motor pump 104 to which the rectifying cover 106 according to the first embodiment is attached.

  As shown in FIG. 4, the pump device 100 includes a column pipe 102 and a submersible motor pump 104 disposed in the column pipe 102. The pump device 100 includes a water inlet 120 on the upstream side of the submersible motor pump 104.

  The discharge pipe 122 is connected orthogonally to the column pipe 102 on the downstream side of the submersible motor pump 104. Further, the pump device 100 has a column hatch 112 on the most downstream side on the extension line from the water inlet 120 passing through the flow path 124 between the column pipe 102 and the submersible motor pump 104. The rectifying cover 106 has a port 107 through which a power cable 110 that supplies electric power to the submersible motor pump 104 passes, and has a hanging jig 108 and connects the submersible motor pump 104 to the column hatch via a hanging wire 114. 112 can be suspended.

  The submersible motor pump 104 has a motor portion 116 covered with a cylindrical frame and has a substantially cylindrical shape. A rectifying cover 106 is attached to the downstream side of the submersible motor pump 104, and the connector 109 of the power cable 110 is housed inside the rectifying cover 106. Note that the flow straightening cover 106 is formed so that the downstream end of the straightening cover 106 is closer to the submersible motor pump 104 than the central axis of the discharge pipe 122, thereby connecting the column pipe 102 and the discharge pipe 122. The effective cross-sectional area of the flow path 124 may be ensured.

  When the pump device 100 having such a configuration is started, fluid is taken into the pump device 100 from the water inlet 120 by the impeller 126 attached to the upstream end of the submersible motor pump 104. The fluid passes through the flow path 124 between the column pipe 102 and the submersible motor pump 104 and is discharged from the discharge pipe 122 with the direction changed by 90 ° on the downstream side of the rectifying cover 106.

  A hanging jig 108 is attached to the downstream surface of the rectifying cover 106, and the rectifying cover 106 also functions as the hanging jig 608 shown in FIG. Specifically, the suspension jig 108 of the rectifying cover 106 is connected to a suspension wire 114 that connects the pump device 100 to the column hatch 112. Here, the material of the rectifying cover 106 may be any of a metal material such as SUS, a polymer material such as resin, a ceramic material, a composite material combining two or more kinds of materials, and these materials may be used. Although what was painted may be sufficient, the thing excellent in corrosion resistance and the conductivity of the heat generated from a motor is preferable.

As shown in FIG. 4, the rectifying cover 106 has an outer shape that is continuous with the frame of the submersible motor pump 104 at the mounting position. The rectifying cover 106 has a shape in which the outer shape gradually decreases toward the downstream of the fluid flow. Therefore, the fluid flows along the outer surface of the rectifying cover 106 on the downstream side of the submersible motor pump 104, and the separation and vortex can be reduced. The vertical cross-sectional shape of the rectifying cover 106 may be a semicircular shape, a semi-elliptical shape, or a triangular shape, and may be any shape as long as fluid separation is reduced.

  By employing the rectifying cover 106 having such a configuration, there is little decrease in the efficiency of fluid transfer, and cavitation and noise on the downstream side of the submersible motor pump 104 can be prevented. In addition, since there is little decrease in the efficiency of fluid transfer, the pump device 100 to which the rectifying cover 106 is attached can increase pump efficiency and can save energy compared to a pump device that does not include the rectifying cover.

  FIG. 5 is an enlarged view showing a configuration around the rectifying cover 206 of the pump device 200 having the rectifying cover 206 according to the second embodiment. The rectifying cover 206 according to the second embodiment is different from the rectifying cover 106 according to the first embodiment in that it does not function as a hanging jig. Specifically, in addition to the connector 209 of the power cable 210, the hanging jig 208 is also housed in the rectifying cover 206, and the hanging wire 214 extending from the hanging jig 208 penetrates the rectifying cover 206 to form a column hatch ( (Not shown). As shown in FIG. 5, the rectifying cover 206 has an outer shape that is continuous with the frame of the submersible motor pump 204 at the mounting position. In addition, the longitudinal cross-sectional shape of the rectification | straightening cover 206 shown in FIG. 5 is a triangle unlike the example of FIG. As shown in FIG. 5, the fluid flows along the outer surface of the rectifying cover 206 on the downstream side of the submersible motor pump 204, and can reduce separation and vortex.

  FIG. 6 is a view showing a pump device 300 having a submersible motor pump 304 to which a rectifying cover 306 according to the third embodiment is attached. The rectifying cover 306 according to the third embodiment is the same as the first or second embodiment in that the downstream side of the rectifying cover 306 is extended to the column hatch 312 and the power cable 310 and the hanging wire 314 pass through the inside. Different from the rectifying covers 106 and 206. The extension 318 of the rectifying cover 306 according to the third embodiment functions as a protective pipe for the power cable 310, the hanging wire 314, and the like. As shown in FIG. 6, the rectifying cover 306 has an outer shape that is continuous with the frame of the submersible motor pump 304 at the mounting position.

  The extension part 318 prevents the separation of the flow and the generation of vortices on the downstream side of the submersible motor pump 304, and prevents the power cable 310 from being entangled by the flow of water. The entanglement of the power cable 310 not only causes a decrease in fluid transfer efficiency, but also leads to damage of the power cable 310. An extension 318 is formed on the side farther from the submersible motor pump 304 than the central axis of the discharge pipe 322 so that the outer diameter of the extension 318 is smaller than the outer diameter of the portion other than the extension 318 of the rectifying cover 306. When the pipe is long, it is formed so as to be smaller on the side closer to the central axis of the discharge pipe 322, thereby ensuring an effective cross-sectional area of the flow path 324 at the connection point between the column pipe 302 and the discharge pipe 322. Also good.

  When the pump device 300 is started, the fluid is taken into the pump device 300 from the water inlet 320 by the impeller 326 attached to the upstream end of the submersible motor pump 304. The fluid passes through a flow path 324 between the column pipe 302 and the submersible motor pump 304 and is discharged from the discharge pipe 322 with the direction changed by 90 ° on the downstream side of the submersible motor pump 304.

  The flow straightening cover 306 according to the third embodiment can prevent the fluid from peeling, suppress the entanglement and damage of the power cable 310, and provide an efficient pump device 300.

In the third embodiment, the rectifying cover 306 is formed such that the top of the rectifying cover 306 is extended to the column hatch 312 to form an extension 318, that is, the extension 318 is a part of the rectification cover 306. Although described, the present invention is not limited to this. The rectifying cover and the protective pipe may be separate parts (not shown). At this time, the protective pipe is formed so that the outer diameter of the protective pipe is smaller than the outer diameter of the rectifying cover on the side farther from the submersible motor pump than the central axis of the discharge pipe, thereby connecting the column pipe and the discharge pipe. The effective cross-sectional area of the flow path in may be ensured.

100, 200, 300: pump device, 102, 202, 302: column pipe, 104, 204, 304: submersible motor pump, 106, 206, 306: rectifying cover, 107, 207: port, 108, 208: hanging jig 109, 209: Connector, 110, 210, 310: Power cable, 112, 312: Column hatch, 114, 214, 314: Hanging wire, 116, 216, 316: Motor part, 318: Extension part, 120, 320 : Water inlet, 122, 322: discharge pipe, 124, 324: flow path, 126, 326: impeller

Claims (8)

Column pipes (102, 202, 302);
A submersible motor pump (104, 204, 304) disposed in the column pipe;
A rectifying cover (106, 206, 306) attached to the submersible motor pump, wherein the outer shape gradually decreases from the frame of the submersible motor pump toward the downstream side of the fluid flow at the mounting position. A rectifying cover (106, 206, 306) having a streamlined outer shape ;
A pull-out type pump device (100, 200, 300). The pump device according to claim 1,
The rectifying cover is a pump device in which the outer shape of the rectifying cover becomes smaller toward the downstream of the flow. The pump device according to claim 1 or 2,
The rectifying cover is a pump device formed of at least one of a metal material having a corrosion resistance, a polymer material, and a ceramic material. The pump device according to any one of claims 1 to 3,
A discharge pipe (122) connected perpendicularly to the column pipe on the downstream side of the submersible motor pump;
The rectifying cover is a pump device formed such that the downstream end of the rectifying cover is closer to the submersible motor pump than the central axis of the discharge pipe. The pump device according to any one of claims 1 to 3,
A pump device further comprising a protective pipe that accommodates and protects at least one of a power cable and a hanging wire, and is attached to a downstream end of the rectifying cover. The pump device according to claim 5,
It further has a discharge pipe connected orthogonally to the column pipe on the downstream side of the submersible motor pump,
The said protection pipe is a pump apparatus formed so that the outer diameter of the said protection pipe may become smaller than the outer diameter of the said rectification | straightening cover in the side far from the said submersible motor pump from the center axis | shaft of the said discharge pipe. Column pipe (302);
A submersible motor pump (304) disposed in the column pipe;
On the downstream side of the flow between the column pipe and the submersible motor pump, a rectifying cover (306) attached to the submersible motor pump, the fluid flow downstream from the frame of the submersible motor pump at the mounting position. A rectifying cover (306) having a continuous streamlined outer shape that gradually decreases without a corner toward the side ;
Have
The rectifying cover has an extension part (318) extended on the downstream side of the rectifying cover,
The extension portion is a pull-out type pump device (300) that houses and protects at least one of a power cable (310) and a suspension wire (314). A rectifying cover attached to a submersible motor pump (104, 204, 304) disposed in a column pipe (102, 202, 302),
A rectifying cover (106, 206, 306) having a continuous streamlined outer shape in which the outer shape gradually decreases without a corner from the frame of the submersible motor pump toward the downstream side of the fluid flow at the mounting position.

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