JP2007032037A - Horizontal pump, pump gate facility, and drainage pumping station - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a horizontal pump which can drain water to a low water level of an intake-side channel or a water tank, can reduce a length thereof in a water flowing direction, and prevents occurrence of air intake vortexes and underwater vortexes, and to provide a pump gate facility and a drainage pumping station using the horizontal pump. <P>SOLUTION: According to the structure of the horizontal pump having pump impellers 2 and a motor 3 mounted in a pump casing 1 thereof, the pump impellers 2 are arranged on a downstream side of the motor 3. Further, in a watercourse in the pump casing 1, a flow regulating plate 4 is arranged on an upstream side of the pump impellers 2, and guide vanes 5 are arranged on a downstream side of the pump impellers 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a horizontal axis pump used for pump gate equipment and the like, and more particularly to a horizontal axis pump having a configuration in which a pump impeller is arranged downstream of a motor, a pump gate facility using the horizontal axis pump, and a drainage station. .

  1A and 1B are diagrams showing a configuration example of a drainage facility provided with a pump gate facility. FIG. 1A is a plan view and FIG. 1B is a side sectional view. Reference numeral 100 denotes an embankment of the main river 101, and a dredger pipe 103 penetrating the embankment 100 and communicating with a natural flow sewer 102 of the tributary river is disposed, and a river surface gate 104 is disposed at the downstream end of the dredger pipe 103. Is arranged. A discharge water tank 105 is disposed at the upstream end of the dredger pipe 103, and a pump gate facility 110 is disposed upstream of the discharge water tank 105. An automatic dust remover 106 is arranged on the upstream side of the pump gate facility 110 of the natural flow sewage 102, and the dust flowing through the natural flow sewage 102 is collected by the automatic dust eliminator 106, lifted up, and conveyed by a conveyor 107. It is transported to a predetermined position. Reference numeral 108 denotes a lifting machine, which is used to lift the automatic dust remover 106 from the natural drainage channel 102 when not in use.

  In the drainage system having the above-described configuration, the door body 111 of the pump gate system 110 is normally lifted and opened, and the water of the small and medium-sized river passes through the natural flow down water channel 102 and the vertical pipe 103 to the mainstream main river 101 under the natural flow. Flows in. When the water level of the main river 101 rises due to a typhoon or torrential rain in the summer, a backflow occurs from the main river 101 to the small and medium rivers through the vertical pipe 103 and the natural flow sewage channel 102. When backflow occurs, small and medium-sized rivers flood and flood into residential areas such as adjacent houses and industrial parks.

  In order to prevent such a situation, the door body 111 of the pump gate facility 110 is closed. However, when the door body 111 is closed, if it rains in the vicinity of the small and medium river, the water level of the small and medium river rises due to the rainwater, and also floods the residential area. Therefore, in order to drain the rainwater of the small and medium rivers into the main river 101 with the door body 111 of the pump gate equipment 110 closed, the pump (horizontal axis pump) 112 of the pump gate equipment 110 is operated to flow down naturally from the small and medium rivers. Water flowing into the water channel 102 is drained to the discharge water tank 105 and drained to the main river 101 through the culvert pipe 103.

FIG. 2 is a diagram showing a configuration example of the horizontal axis pump 112 installed on the door body 111 of the pump gate facility 110. As shown in the figure, the horizontal axis pump 112 has a pump impeller 114, a guide vane 115, and a motor 116 disposed in order in the pump casing 113 from the upstream side to the downstream side, and sucks into the upstream end of the pump casing 113. A cover 117 is provided. The entire suction cover 117 is inclined downward toward the upstream side, and the opening surface of the suction port 117a is inclined downward toward the upstream side at a predetermined angle with respect to the water flow direction. Reference numeral 118 denotes a flap valve (check valve) provided at the discharge port of the pump casing 113. The horizontal shaft pump 112 is attached to the gate door body 111 via a support member 119, and the flap valve 118 is housed inside the door body 111.
JP 2002-303292 A JP 2003-003450 A

  In the above pump gate facility, in order to allow drainage to a low water level in the suction side water channel 130 (natural flow down water channel 102 in FIG. 1), the suction cover 117 is inclined downward on the upstream side of the suction side water channel 130 and the suction port. It is necessary to lower the upper opening of 117a. However, it is preferable that the flow path of the pump impeller 114 is not biased due to the nature of the fluid, that is, the pump casing 113 is not inclined. As described above, the horizontal axis pump in the conventional pump gate equipment allows drainage to a low water level in the suction-side water passage 130, so that the pump casing 113 in the pump impeller 114 portion is not inclined and the pump casing 113 is not inclined. The suction cover 117 extends from the pump impeller 114 to the upstream side and is inclined downward at the upstream side at the end thereof. Therefore, this is one of the factors that increase the distance that the horizontal axis pump 112 protrudes upstream from the gate door body 111 (the total length becomes longer).

  In addition, as shown in FIG. 3, when the water level on the suction side of the pump (the water level in the water intake passage) is high, the actual pump head is small, the operation is in the stable region I, and no air suction vortex is generated. When the water level on the suction side of the pump is low, the actual head becomes large, the pump operates in the unstable region II (small water volume region), and the air suction vortex is generated in the portion where the submerged depth of the suction cover 117 is shallow, and the pump A reverse flow of water is generated in the impeller 114 portion. If these air suction vortices and water backflow are generated, it will cause vibration and noise of the horizontal shaft pump 112 and a decrease in drainage capacity.

  The present invention has been made in view of the above points. The horizontal pump, which can drain water to a low water level, can reduce the length in the water flow direction, and can suppress the generation of air suction vortices and underwater vortices, The purpose is to provide a pump gate facility using a shaft pump and a drainage station.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a horizontal shaft pump in which a pump impeller and a motor for driving the pump impeller are built in a pump casing, and the pump impeller is disposed downstream of the motor. In addition, the flow passage in the pump casing is provided with a rectifying plate on the upstream side of the pump impeller and a guide vane on the downstream side of the pump impeller.

  According to a second aspect of the present invention, in the horizontal shaft pump in which the pump impeller and the motor for driving the pump impeller are built in the pump casing, the pump impeller is disposed on the downstream side of the motor, And a guide vane on the downstream side of the pump impeller, and the upper end portion of the suction opening of the suction cover is the upper end of the attachment portion of the suction cover. The rectifying plate is positioned at a lower position, and is characterized in that it has an angle that suppresses the drift of the suction water flow.

  According to a third aspect of the present invention, in the horizontal shaft pump according to the second aspect, the rectifying plate provided near the upper and lower portions of the pump casing is provided in parallel with the water flow, and is provided near both side surfaces of the pump casing. The flow straightening plate is provided at an angle that suppresses the drift of the suction water flow.

  According to a fourth aspect of the present invention, in the horizontal shaft pump in which a pump impeller and a motor for driving the pump impeller are built in a pump casing, the pump impeller is disposed on the downstream side of the motor, and a suction cover is provided. The upper portion of the suction opening of the motor is positioned below the upper end of the suction cover mounting portion, and the frame of the motor is in contact with or passes through the suction cover. And

  According to a fifth aspect of the present invention, in the horizontal shaft pump according to the fourth aspect, the motor cable includes a portion where the motor frame is in contact with the suction cover or the motor frame passes through the suction cover. It is characterized by taking out from the part that is.

  According to a sixth aspect of the present invention, in the horizontal axis pump according to any one of the first to fifth aspects, the suction cover is provided with vortex suppression means for suppressing air suction vortex and / or underwater vortex. Features.

  A seventh aspect of the present invention is the pump gate facility having a configuration in which a horizontal axis pump is arranged in a gate having a door body that opens and closes a suction side water channel, and the horizontal axis pump is any one of the first to sixth aspects. The horizontal axis pump described in 1 is used.

The invention according to claim 8 is characterized in that, in a drainage pump station equipped with a fixed horizontal shaft pump, the horizontal shaft pump according to any one of claims 1 to 6 is used as the horizontal shaft pump. .

  According to the first aspect of the present invention, since the pump impeller is disposed on the downstream side of the motor, there is no problem in the pump characteristics even if the flow path in the portion where the motor is located is uneven. A suction cover that is inclined downward on the upstream side is attached to the part, and the motor can be positioned so as to protrude into the suction cover, the upper end of the suction opening of the suction cover can be lowered to lower the suction water level, and the pump casing The overall length can be shortened. Therefore, it is possible to provide a horizontal shaft pump that can drain to a low water level and has a short overall length.

  According to the second aspect of the present invention, since the upper end of the suction opening of the suction cover is positioned below the upper end of the attachment portion of the suction cover, the suction water level can be further lowered. Further, since the flow straightening plate has an angle that suppresses suction drift, the water flowing into the pump impeller is straightened and flows straight. Further, the swirl component of the water flow discharged from the pump impeller is removed by a guide vane provided on the downstream side of the pump impeller. Therefore, it is possible to provide a horizontal shaft pump that can drain to a low water level and has a short overall length.

  According to the third aspect of the present invention, since the rectifying plates provided in the vicinity of both side surfaces of the pump casing are provided at an angle that suppresses the drift, the suction opening of the suction cover is angled from below. The water stream that flows in is rectified and flows straight into the pump impeller.

  According to the fourth aspect of the present invention, the pump impeller is disposed on the downstream side of the motor, and the upper end portion of the suction opening of the suction cover is positioned below the upper end of the suction cover mounting portion. In addition, since the motor frame is in contact with or passes through the suction cover, the suction water level can be further lowered and the overall length of the pump casing can be shortened. Therefore, it is possible to provide a horizontal shaft pump that can drain to a low water level and has a short overall length.

  According to the fifth aspect of the present invention, since the motor cable is taken out from the portion where the motor frame is in contact with the suction cover or the portion where the motor frame penetrates the suction cover, the motor cable is conventionally used. Without passing the running water in the pump casing, and there is no need to provide an anti-vibration protection tube that prevents the motor cable from vibrating due to the running water, so that the pump casing can be made smaller and the pump can be made more compact. . Moreover, since the cross-sectional area of the flow passage in the pump casing is increased, the loss is reduced.

  According to the sixth aspect of the present invention, since the vortex suppressing means for suppressing the air suction vortex and / or the underwater vortex is provided in the suction cover, the air suction vortex and / or the cause of the decrease in vibration, noise and drainage capacity Or underwater vortices can be suppressed (prevented). Therefore, in addition to the effects of the inventions of the first to fifth aspects, it is possible to provide a horizontal shaft pump that is free from vibration and noise and does not have a reduced drainage capacity even when the suction water level is lowered.

  According to the invention described in claim 7, since the horizontal axis pump according to any one of claims 1 to 6 is used for the horizontal axis pump of the pump gate equipment, vibration, noise, and It is possible to provide a pump gate facility with no reduction in drainage capacity. Moreover, since the approaching flow velocity to the pump can be increased, the width of the suction-side water channel can be reduced, and the equipment can be configured compactly.

  According to the invention described in claim 8, since the horizontal axis pump according to any one of claims 1 to 6 is used as the horizontal axis pump of the drainage station, vibration and noise are small, and the water level of the suction side water channel is low. Even if it drops, it can provide a drainage station where the drainage flow rate does not drop. Moreover, since the approaching flow velocity to the pump can be increased, the suction water tank can be made small, and the equipment can be configured compactly.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 is a diagram showing a configuration example of a horizontal axis pump according to the present invention. The horizontal axis pump includes a pump casing 1, and a pump impeller 2 and a motor 3 that rotationally drives the pump impeller 2 are disposed in the pump casing 1. Further, in the flow path in the pump casing 1, a rectifying plate 4 is disposed between the pump impeller 2 and the motor 3, and a guide vane 5 is disposed downstream of the pump impeller 2. A flap valve 6 is provided at the discharge port of the pump casing 1. Further, the frame of the motor 3 protrudes from the upstream end of the pump casing 1 to the upstream side. A suction cover 7 is attached to the upstream end of the pump casing 1 so as to be inclined downward on the upstream side of the suction side water passage 20, and the upper part of the frame of the motor 3 is in contact with the inner surface of the suction cover 7.

  As described above, the motor 3 is arranged on the upstream side of the pump impeller 2, and the suction cover 7 is attached so as to be inclined downward on the upstream side of the suction side water channel 20 until the inner surface thereof contacts the upper part of the frame of the motor 3. The upper end of the suction opening formed by the suction cover 7 and the upstream end of the pump casing 1 is lowered, the suction water level can be lowered, and the length of the suction cover 7 is set to the length of the pump casing 1. The total length of the added horizontal shaft pump can be shortened. By starting the motor 3 and rotating the pump impeller 2, the water sucked from the suction side water passage 20 through the suction opening as shown by an arrow A is arranged in a flow path in the pump casing 1. The air is sucked while being rectified through 4, passes through the pump impeller 2 and the guide vane 5, and is discharged from the discharge port of the pump casing 1 by pushing the flap valve 6 open.

  FIG. 5 is a view showing another configuration example of the horizontal axis pump according to the present invention. The horizontal axis pump shown in the figure is different from the horizontal axis pump shown in FIG. 4 in that the upper part of the frame of the motor 3 passes through the suction cover 7 and protrudes outward. The cable terminal part 8 which attaches a motor cable to the part is provided. Thus, by letting the suction cover 7 pass through the upper part of the frame of the motor 3, the suction cover 7 can be further inclined downward on the upstream side of the suction side water channel 20, the suction water level can be lowered, and the horizontal axis pump Can be further shortened.

  Further, by providing the cable terminal portion 8 at the through-projecting portion of the frame of the motor 3, the motor cable is prevented from passing through the running water in the pump casing 1 as in the prior art, and the motor cable is prevented from being vibrated by the running water. There is no need to provide an anti-vibration protective tube. Accordingly, the space in the pump casing 1 required for taking out the motor cable can be saved, and the horizontal shaft pump can be configured more compactly. Further, in the case of a configuration in which the motor cable of the conventional horizontal shaft pump is taken out from the pump impeller side of the motor, for example, since it is configured to pass between the rectifying plates, the rectifying plate becomes thick and the flow passage cross-sectional area becomes narrow accordingly. Therefore, there is a problem that the flow rate is increased and the loss is increased. However, since the motor cable is taken out through the cable terminal portion 8 attached to the penetrating protrusion portion of the motor frame, such a problem is eliminated.

  Although not shown, the horizontal shaft pump having the configuration shown in FIG. 4 is also configured such that the cable terminal portion 8 is attached to the contact portion between the suction cover 7 and the frame of the motor 3 and the motor cable is taken out from the contact portion. Thus, like the horizontal axis pump shown in FIG. 5, the motor cable does not pass running water in the pump casing 1 and there is no need to provide an anti-vibration protection tube or the like, and the horizontal axis pump is made more compact. In addition, the cross-sectional area of the flow passage in the pump casing can be increased and the flow velocity loss can be reduced.

  FIG. 6 is a diagram showing another configuration example of the horizontal axis pump according to the present invention. The horizontal axis pump shown in FIG. 4 differs from the horizontal axis pump shown in FIG. 4 in that, in the horizontal axis pump shown in FIG. Both are provided so as to be parallel to the axial direction (water flow direction) of the horizontal axis pump as shown in FIG. 7 (a). However, in the horizontal axis pump shown in FIG. Although the rectifying plate 4 provided in is parallel to the axial direction, the rectifying plates provided on the left and right are inclined at a predetermined angle with respect to the axial direction as shown in FIG. is there. 7A is a transverse sectional view of the pump casing portion of the horizontal shaft pump shown in FIG. 4, and FIG. 7B is a transverse sectional view of the pump casing portion of the horizontal shaft pump shown in FIG.

  As described above, the rectifying plates provided on the left and right of the cross section of the flow passage in the pump casing 1 are arranged so as to be inclined with respect to the axial direction as shown in FIG. The flow of water entering can be straightened. That is, by tilting the suction cover 7, the water flow flowing into the suction opening is angled, but the rectifying plates 4, 4 provided on the left and right sides in the pump casing 1 are tilted by a predetermined angle with respect to the axial direction. Thus, the water flow entering the pump impeller 2 can be straightened. The water flow including the swirling component discharged from the pump impeller 2 is discharged by discharging the swirling component by the guide vane 5 disposed in the flow path downstream of the pump impeller 2.

  In the horizontal axis pump configured as described above, when the water level of the suction side water passage 20 is lowered, air is sucked from a suction opening formed by the suction cover 7 and the upstream end of the pump casing 1 to generate an air suction vortex and a submerged vortex. . If this air suction vortex or underwater vortex is generated, it will cause pump vibration, noise, and a decrease in drainage capacity. Therefore, by forming the suction cover 7 as the following suction cover 10, it is possible to suppress (prevent) the occurrence of air suction vortices and underwater vortices.

  The suction cover 10 shown in FIG. 8 is inclined (bent) downward toward the upstream side of the suction side water channel 20 as a whole as shown in the figure, and the suction opening 11 is the bottom surface (not shown) of the suction side water channel. Is inclined by a predetermined angle (inclined toward the upper upstream side). The suction cover 10 is formed so that a substantially rectangular upper end center portion (upper end center portion) 12 is higher than both end portions 13 and protrudes upstream from the both end portions 13.

  Further, the suction cover 10 shown in FIG. 9 is inclined (bent) downward toward the upstream side as a whole as shown in the figure, and the surface of the suction opening 11 is the bottom surface (not shown) of the suction side water channel 20. 8 is the same as the suction cover 10 shown in FIG. 8 in that it is inclined at a predetermined angle (inclined toward the upper upstream side). Here, the upper end both end portions 13 of the suction opening 11 of the suction cover 10 are formed so as to be higher than the upper end central portion (upper end central portion) 12 and are formed so as to protrude upstream from the upper end central portion 12. ing. 8 and 9, (a) is a side view of the horizontal shaft pump, (b) is a front view seen from the upstream side (viewed from the direction of arrow A), and (c) is a plan view.

  The air suction vortex is generated in a shallow portion (high portion) at the upper end of the suction opening 11 of the suction cover 10. As shown in FIGS. 8 and 9, by forming the suction opening 11 upper end central portion 12 or upper end both ends 13 of the suction cover 10 to be high and protrude upstream, the submerged depth of this portion becomes shallow. That is, by configuring the suction cover 10 in the shape shown in FIG. 8 or FIG. 9, a portion with a shallow depth of immersion (= a place where an air suction vortex is generated) can be formed. Since this submerged depth portion, that is, the upper end central portion 12 or the upper end both ends 13 of the suction opening 11 protrudes upstream, the distance between the upper end of the suction opening 11 and the water surface near the suction opening 11 is increased. The generation of suction vortices is suppressed (prevented).

  FIG. 10 is a diagram illustrating another configuration example of the suction casing that suppresses the generation of the air suction vortex. 10, (a) is a side view of the suction casing, (b) is a front view seen from the upstream side (viewed from the direction of arrow A), and (c) is a plan view. Here, on the upper end of the suction opening 11 of the suction cover 10, a plate-like body 14 that is inclined toward the upper upstream side of the suction side water channel 20 is provided. By providing this plate-like body 14, the water flow near the water surface above the suction opening 11 is disturbed. Thereby, the swirl | vortex flow of water used as the cause of generation | occurrence | production of air suction vortex can be suppressed, and air suction vortex can be suppressed (prevented). Further, since the plate-like body 14 contracts the flow at the upper part of the suction opening 11, the water flow velocity at the upper part of the suction opening 11 is increased, so that the swirling flow generated on the water surface is rearward (downstream) from the suction opening 11. The air suction vortex can be prevented.

  In addition, although the plate-shaped body 14 is provided on the upper end of the suction opening 11 of the suction cover 10 in the figure, although illustration is abbreviate | omitted, the suction cover 10 downstream from the suction opening 11 (downstream side of the suction side water channel 20). Even if the plate-like body 14 is provided on the upper portion of the plate so as to incline toward the upper side on the downstream side, the swirling flow of water that similarly causes the generation of the air suction vortex can be suppressed, and the air suction vortex can be prevented. In the above example, the plate-like body 14 has a rectangular shape. However, as shown in FIGS. 11 (a), (b), (c), and (d), it may be a mountain shape, a trapezoidal shape, an arc shape, or a comb shape. Also, as shown in FIG. 11 (e), a plurality of holes 14a may be formed in the plate-like body 14, and although not shown, a waveform may be used.

  As a countermeasure for suppressing the underwater vortex generated in water, there is a method of installing plate-like bodies 15 and 16 below the suction opening 11 of the suction cover 10 as shown in FIGS. In FIG. 12, the two plate-like bodies 15, 15 are inclined at a predetermined angle with respect to the vertical direction at the lower part of the suction opening 11 of the suction cover 10, and the two plate-like bodies 15, 15 form a square shape. Are provided in parallel with the water flow in the suction-side water channel 20. In FIG. 13, two plate-like bodies 16, 16 are inclined at a predetermined angle with respect to the vertical direction at the lower part of the suction opening 11 of the suction cover 10, and the two plate-like bodies 16, 16 form an inverted C shape. Thus, it is provided in parallel with the water flow of the suction side water channel 20. 12 and 13, (a) is a side view, and (b) is a front view seen from the upstream side (viewed from the direction of arrow A).

  By installing the plate-like bodies 15, 15 or 16, 16 having an angle with the vertical direction at the lower part of the suction opening 11 of the suction cover 10 as described above, the water flow sucked from the bottom of the suction-side water channel is the plate-like body 15. , 15 or 16, 16 to suppress (prevent) underwater vortex generation. In addition, by disturbing the flow of water below the suction opening 11 of the suction cover 10, the suction flow sucked from the side of the suction opening 11 is also disturbed by the influence, so that the underwater vortex generated from the side wall is also suppressed (prevented). )can do.

  14 is a view showing the suction cover 10 having a configuration in which the plate-like bodies 15 and 15 of FIG. 12 are provided below the suction opening 11 of the suction cover 10 of FIG. 14A is a side view of the suction cover, FIG. 14B is a front view seen from the upstream side (viewed from the direction of arrow A), and FIG. 14C is a plan view. In this way, the upper end center portion 12 of the suction opening 11 is formed so as to be higher than the both end portions 13, and the lower portion of the suction opening 11 of the suction cover 10 formed so as to protrude upstream from the both end portions 13. The two plate-like bodies 15 and 15 are inclined at a predetermined angle with respect to the vertical direction, and the two plate-like bodies 15 and 15 are provided in parallel with the flow of water so as to form a C shape. The generation of air suction vortices and underwater vortices can be suppressed. In this case, the plate-like bodies 15 may be provided in the vertical direction as indicated by the dotted line in FIG.

  Although not shown, the two plate-like bodies 16 and 16 are inclined at a predetermined angle with respect to the vertical direction at the lower portion of the suction opening 11 as shown in FIG. You may provide in parallel with the flow of water so that the plate-shaped bodies 16 and 16 may form an inverted-C shape. Moreover, although illustration is abbreviate | omitted, even if the plate-like bodies 15 and 15 of FIG. 12 or the plate-like bodies 16 and 16 of FIG. 10 are provided in the lower part of the suction opening 11 of the suction cover 10 of FIG. Good. In this case, the plate-like bodies 15 and 15 or the plate-like bodies 16 and 16 may be provided vertically. Even if it does in this way, generation | occurrence | production of an air suction vortex and an underwater vortex can be suppressed.

  FIG. 15 is a view showing the suction cover 10 having a configuration in which the plate-like bodies 15 and 15 of FIG. 12 are provided below the suction opening 11 of the suction cover 10 of FIG. 15A is a side view of the suction cover, FIG. 15B is a front view seen from the upstream side (viewed from the direction of arrow A), and FIG. 15C is a plan view. As shown in the drawing, two plate-like bodies are formed at the lower part of the suction opening 11 of the suction cover 10 formed by providing a plate-like body 14 that is inclined toward the upper upstream side of the suction side water channel 20 on the upper end of the suction opening 11. 15 and 15 are inclined at a predetermined angle with respect to the vertical direction, and the two plate-like bodies 15 and 15 are provided in parallel with the water flow so as to form a letter C shape. Thereby, generation | occurrence | production of an air suction vortex and an underwater vortex can be suppressed. In this case, the plate-like bodies 15 and 15 may be provided in the vertical direction as indicated by a dotted line in FIG.

  Although not shown, the two plate-like bodies 16 and 16 are inclined at a predetermined angle with respect to the vertical direction at the lower portion of the suction opening 11 as shown in FIG. You may provide in parallel with the water flow of the suction side waterway 20, so that the plate-shaped bodies 16 and 16 may form a reverse C-shape. Even if it does in this way, generation | occurrence | production of an air suction vortex and an underwater vortex can be suppressed.

  FIG. 16 is a view showing another configuration example of the suction casing of the horizontal shaft pump according to the present invention. In the suction cover 10, plate-like bodies 17, 17 projecting from the suction opening 11 are installed on the side of the suction opening 11 toward the upstream side of the suction side water channel 20 and vertically downward. 16A is a side view, and FIG. 16B is a front view seen from the upstream side (viewed from the direction of arrow A). Thus, by providing the plate-like bodies 17 and 17 in the side part of the suction opening 11, the air suction vortex and the underwater vortex by the drift of water can be suppressed (prevented).

  In particular, as shown in FIG. 17, when a plurality of (two in the figure) horizontal shaft pumps 21-1 and 21-2 having the suction cover 10 having the above-described configuration are arranged in parallel in the suction-side water channel 20. When there is a stopped horizontal axis pump, for example, when the horizontal axis pump 21-1 is stopped, a drift occurs to the operating horizontal axis pump 21-2, and air suction vortex and submerged vortex are generated. Although it is going to generate | occur | produce here, since the plate-shaped bodies 17 and 17 which protruded from the suction inlet 11 toward the upstream of the flow direction of water are installed in the suction inlet 11 side part of the suction cover 10 as mentioned above, this The suction flow is rectified by the plate-like body 17 to suppress (prevent) the generation of air suction vortices and underwater vortices.

  FIG. 18 is a view showing another configuration example of the suction casing of the horizontal shaft pump according to the present invention. 18A is a side view of the suction casing, FIG. 18B is a front view seen from the upstream side (viewed from the direction of arrow A), and FIG. 18C is a plan view. This suction cover 10 is provided with a plate-like body 18 vertically below the lower end of the suction opening 11, and plate-like bodies 19, 19 are provided on both sides of the opening of the suction opening 11 so as to face the water flow of the suction-side water channel 20. In this way, by providing the suction opening 11 and the plate-like body 19 on the opening side of the suction opening 11 so as to oppose the flow of water, the flow of water from the rear of the suction opening 11 toward the suction opening 11 is suppressed. , Suppress (prevent) underwater vortex generation. In addition, although the plate-like body 18 is provided in the vertical direction at the lower end of the suction port 11, it may be provided at a predetermined angle with respect to the vertical direction. Further, here, a plate-like body is provided on the lower end of the suction opening 11 and on both sides of the opening of the suction opening 11, but the plate-like body is either the lower end of the suction opening 11 or both sides of the opening of the suction opening 11. You may provide only in one side.

  FIG. 19 is a view showing another configuration example of the suction casing of the horizontal shaft pump according to the present invention. 19, (a) is a side view of the suction casing, and (b) is a front view seen from the upstream side (viewed from the direction of arrow A). The suction cover 10 is provided with a plate-like body 22 in the vertical direction, that is, facing the water flow in the suction-side water channel 20 so as to surround the outer periphery of the upper and lower sides and both sides of the casing 10 downstream of the suction opening 11. . Thus, by providing the plate-like body 22 facing the flow of water so as to surround the outer periphery of the suction cover 10 on the downstream side from the suction opening 11 of the suction cover 10, from the rear of the suction opening 11 to the suction opening 11. Suppresses the flow of water that circulates toward you, and suppresses (prevents) the generation of underwater vortices. The plate-like body 22 is provided in a direction perpendicular to the water flow direction, but may be provided at a predetermined angle with respect to the vertical direction. Further, the plate-like body 22 may be provided only on both side portions or the lower end portion of the suction cover 10.

  FIG. 20 is a view showing another configuration example of the suction casing of the horizontal shaft pump according to the present invention. 20, (a) is a side view of the suction casing, (b) is a front view seen from the upstream side (viewed from the direction of arrow A), and (c) is a plan view. The suction cover 10 is provided with a plate-like body 18 shown in FIG. 18 at the lower end of the suction opening 11 of the suction cover 10 shown in FIG. 13, and plate-like bodies 19, 19 are arranged on both sides of the suction opening 11. It is provided opposite to the water flow. In this manner, the plate-like body 14 is provided at the upper end of the suction opening 11 of the suction cover 10, and the plate-like body 18 is provided vertically at the lower end of the suction opening 11. Further, the plate-like body 18 is provided vertically at the lower end of the suction opening 11. By providing the plate-like bodies 19 and 19 on both sides of the opening facing the flow of water, the air suction vortex is prevented similarly to the suction casing shown in FIG. Prevents the generation of vortices. Here, the plate-like bodies 18, 19, 19 are provided at the lower end of the suction opening 11 and both sides of the opening of the suction opening 11, but the plate-like body is the lower end of the suction opening 11 or both sides of the opening of the suction opening 11. Either one of the parts may be used.

  FIG. 21 is a view showing another configuration example of the suction casing of the horizontal shaft pump according to the present invention. 21A is a side view of the suction casing, and FIG. 21B is a front view seen from the upstream side (viewed from the direction of arrow A). This suction casing 10 is provided with a plate-like body 22 in the vertical direction so as to surround the outer periphery of the casing 10 as shown in FIG. 19 on the downstream side of the suction port 11 of the suction casing 10 shown in FIG. As described above, the plate-like body 14 inclined upward is provided on the upper end of the suction opening 11 of the suction cover 10, and the plate-like body 22 is provided on the downstream side of the suction opening 11 so as to surround the outer periphery of the suction cover 10. Thus, the air suction vortex is prevented as in the suction casing shown in FIG. 10, and the underwater vortex is prevented from being generated as in the suction casing shown in FIG. 19.

  FIG. 22 is a view showing another configuration example of the suction casing of the horizontal shaft pump according to the present invention. 22A is a side view of the suction casing, FIG. 22B is a front view seen from the upstream side (viewed from the direction of arrow A), and FIG. 22C is a plan view. The suction cover 10 is provided with projecting plates (rectifying plates) 23 and 24 projecting to the upstream side of the water flow at the top, bottom, left, and right of the suction opening 11, and a plate shape that partitions the suction port 11 left and right at the center in the width direction. A body 25 is provided. This plate-like body 25 protrudes from the opening of the suction opening 11 to the upstream side of the suction-side water channel 20 and is arranged in parallel with the water flow. As described above, the upper and lower, left and right ends of the suction opening 11 of the suction cover 10 are provided with the projecting plates (rectifying plates) 23 and 24 projecting to the upstream side of the suction-side water channel 20, and the suction opening 11 is provided at the center in the width direction. By providing the plate-like body 25 that partitions right and left, it is possible to suppress generation of a large underwater vortex at the opening of the suction opening 11.

  FIG. 23 is a view showing another configuration example of the suction casing of the horizontal shaft pump according to the present invention. In the present suction casing, a plurality of (two in the figure) horizontal shaft pumps 21-1 and 21-2 arranged in parallel with the suction-side water channel 20 are provided with a suction cover 10 integrated with the suction-side water channel 20. In addition, the shape of the integral suction cover 10 is the same as the structure which removed the plate-shaped body 14 of the suction cover 10 shown, for example in FIG. That is, as a whole, it is inclined (bent) downward toward the upstream side of the suction-side water channel 20, and the opening surface is inclined at a predetermined angle toward the bottom surface of the suction-side water channel 20 (inclined toward the upper upstream side). is doing. By providing the suction cover 10 integrally with the plurality of horizontal axis pumps 21 in this way, for example, even when one horizontal axis pump 21-1 is in operation and the other horizontal axis pump 21-2 is stopped, the suction side water channel 20. The velocity distribution Vd of the water flow in the vicinity of the suction opening 11 of the inner suction cover 10 is a velocity distribution in which the maximum flow velocity as shown in the drawing gradually decreases from the center of the suction side water channel 20 toward both sides, and there is no drift. Generation of vortices and air suction vortices can be suppressed.

  On the other hand, as shown in FIG. 24, a suction cover 10 is provided on each of a plurality of (two in the figure) horizontal shaft pumps 21-1 and 21-2 arranged in parallel with the suction-side water channel 20. For example, when one horizontal axis pump 21-1 is in operation and the other horizontal axis pump 21-2 is in operation, the flow velocity distribution Vd in the suction-side water channel 20 is as illustrated. That is, the water flow in the vicinity of the suction opening 11 of the suction cover 10 of the horizontal axis pump 21-1 during operation becomes faster, resulting in an uneven flow velocity distribution, and the underflow vortex and air suction vortex are likely to occur due to the drift.

  FIG. 25 is a view showing another configuration example of the suction casing of the horizontal shaft pump according to the present invention. In this suction casing, suction covers 10 and 10 are provided in each of the two horizontal shaft pumps 21-1 and 21-2 arranged in parallel to the suction-side water channel 20. A large plate-like body 26 is provided on the side of the suction-side water channel 20 of each suction cover 10 and a small plate-like body 27 is provided on the opposite side so as to protrude upstream of the water flow, and provided in parallel with the water flow. ing. Thus, by providing the large plate-like body 26 on the side of the suction-side water channel 20 on the side wall side of each suction cover 10 and the small plate-like body 27 on the opposite side, one horizontal shaft pump 21 is provided. Even when -1 is operated and the operation of the other horizontal axis pump 21-2 is stopped, the drift can be reduced, and the generation of underwater vortex and air suction vortex due to the drift can be reduced.

  In the above example, the plate-like bodies 26 and 27 are protruded upstream and provided in parallel with the water flow. However, the plate-like bodies 26 and 27 are not limited to this, for example, as shown in FIG. The plate-like body 17 and the plate-like bodies 18 and 19 shown in FIG. 18 may be used. In short, in a device in which a plurality of horizontal-axis pumps each having a suction casing are arranged in the suction-side water channel 20, the operation of each horizontal-axis pump is performed. A rectifying plate and a plate-like body may be provided in each suction casing so as to exert an action of suppressing the drift generated in the suction-side water channel 20 due to the stop.

  In the above configuration example of the suction cover, vortex suppression means for suppressing the air suction vortex and the underwater vortex are provided, but these vortex suppression means are appropriately combined to more effectively suppress the air suction vortex and the underwater vortex. It is also possible to configure vortex suppression means.

  Even if the water level of the natural drainage channel is lowered by using the horizontal axis pump provided with the suction cover 10 having the above configuration for the horizontal axis pump of the pump gate equipment 200 having the configuration shown in FIGS. And the generation of underwater vortices can be suppressed, so that pump gate equipment can be provided that can suppress the reduction in pump discharge flow, vibration, and noise caused by these air suction vortices and underwater vortices. In addition, by using a horizontal axis pump provided with the suction cover 10 having the above-described configuration in a drainage pump station provided with a fixed pump, it is possible to provide a drainage pump station that can suppress vibration and noise and that does not change the drainage flow rate.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible.

It is a figure which shows the structural example of a drainage machine facility. It is a figure which shows the structural example of pump gate equipment. It is a figure which shows the head curve of a horizontal axis pump. It is a figure which shows the structural example of the horizontal shaft pump which concerns on this invention. It is a figure which shows the structural example of the horizontal shaft pump which concerns on this invention. It is a figure which shows the structural example of the horizontal shaft pump which concerns on this invention. It is a figure which shows the flow-path cross section in the pump casing of the horizontal shaft pump which concerns on this invention. It is a figure which shows the structural example of the suction cover of the horizontal shaft pump which concerns on this invention. It is a figure which shows the structural example of the suction cover of the horizontal shaft pump which concerns on this invention. It is a figure which shows the structural example of the suction cover of the horizontal shaft pump which concerns on this invention. It is a figure which shows the example of a shape of the plate-shaped body of the suction cover of the horizontal shaft pump which concerns on this invention. It is a figure which shows the structural example of the suction cover of the horizontal shaft pump which concerns on this invention. It is a figure which shows the structural example of the suction cover of the horizontal shaft pump which concerns on this invention. It is a figure which shows the structural example of the suction cover of the horizontal shaft pump which concerns on this invention. It is a figure which shows the structural example of the suction cover of the horizontal shaft pump which concerns on this invention. It is a figure which shows the structural example of the suction cover of the horizontal shaft pump which concerns on this invention. It is a figure which shows the parallel arrangement structural example of the horizontal shaft pump provided with the suction cover which concerns on this invention. It is a figure which shows the structural example of the suction cover of the horizontal shaft pump which concerns on this invention. It is a figure which shows the structural example of the suction cover of the horizontal shaft pump which concerns on this invention. It is a figure which shows the structural example of the suction cover of the horizontal shaft pump which concerns on this invention. It is a figure which shows the structural example of the suction cover of the horizontal shaft pump which concerns on this invention. It is a figure which shows the structural example of the suction cover of the horizontal shaft pump which concerns on this invention. It is a figure which shows the example of arrangement structure and flow velocity distribution of the horizontal shaft pump provided with the suction cover which concerns on this invention. It is a figure which shows the example of arrangement structure and flow velocity distribution of the horizontal shaft pump provided with the suction cover which concerns on this invention. It is a figure which shows the example of arrangement | positioning structure of the horizontal shaft pump provided with the suction cover which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pump casing 2 Pump impeller 3 Motor 4 Current plate 5 Guide vane 6 Flap valve 7 Suction cover 10 Suction cover 11 Suction opening 12 Center part of upper end of suction port 13 Both ends of suction port 14 Plate body 15 Plate body 16 Plate Plate 17 plate 18 18 plate 19 plate 20 suction side water channel 21 horizontal axis pump 22 plate 23 protruding plate 24 protruding plate 25 plate 26 plate 26 27 plate 27

Claims (8)

In a horizontal shaft pump incorporating a pump impeller and a motor for driving the pump impeller in a pump casing,
A pump impeller is arranged on the downstream side of the motor, a flow regulating plate is provided on the upstream side of the pump impeller in the flow path in the pump casing, and a guide vane is provided on the downstream side of the pump impeller. A horizontal axis pump characterized by In a horizontal shaft pump incorporating a pump impeller and a motor for driving the pump impeller in a pump casing,
A pump impeller is disposed on the downstream side of the motor, and a flow passage in the pump casing is provided with a rectifying plate upstream of the pump impeller and a guide vane on the downstream side of the pump impeller, The upper end portion of the suction opening of the suction cover is positioned below the upper end of the suction cover mounting portion, and the rectifying plate has an angle that suppresses the drift of the suction water flow. Features a horizontal axis pump. The horizontal axis pump according to claim 2,
The rectifying plates provided near the upper and lower portions of the pump casing are provided in parallel with the water flow, and the rectifying plates provided near both side surfaces of the pump casing are provided at an angle that suppresses the drift of the suction water flow. A horizontal axis pump characterized by that. In a horizontal shaft pump incorporating a pump impeller and a motor for driving the pump impeller in a pump casing,
The pump impeller is arranged on the downstream side of the motor, and the upper part of the suction opening of the suction cover is positioned below the upper end of the suction cover mounting part, and the frame of the motor covers the suction cover. A horizontal shaft pump that is in contact with or passes through the suction cover. The horizontal axis pump according to claim 4,
The horizontal shaft pump, wherein the motor cable is taken out from a portion where the motor frame is in contact with the suction cover or a portion passing through the suction cover. The horizontal axis pump according to any one of claims 1 to 5,
A horizontal axis pump characterized in that the suction cover is provided with vortex suppression means for suppressing air suction vortex and / or underwater vortex. In the pump gate equipment of the configuration in which the horizontal axis pump is arranged in the gate having the door body that opens and closes the suction side waterway,
A pump gate facility using the horizontal axis pump according to any one of claims 1 to 6 as the horizontal axis pump. In a drainage station with a fixed horizontal shaft pump,
A drainage pump station using the horizontal axis pump according to any one of claims 1 to 6 as the horizontal axis pump.

Images