JP2007231748A - Pump device and and pump gate device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pump device and a pump gate device causing little entangling phenomenon of fabric foreign matter or long foreign matter. <P>SOLUTION: An impeller of the pump device 11 is attached to a blade boss 18a and formed so that a suction-side leading edge 18c of a blade 18b is formed to be a sweptback blade. The leading edge 18c is formed so that a relationship between the shortest distance L and shortest distances L1, L2 to Ln-1, Ln satisfies L≥L1≥L2 to Ln-1≥Ln, wherein the shortest distance L is along a blade face 18b from an entrance point A to an exit point B of a boss line 18d which is made in a joint part between the blade boss 18a and a base end side of the blade 18b, and the shortest distances L1, L2 to Ln-1, Ln are along the blade 18b face from each point A1, A2 to An-1, An up to the exit point B with respect to arbitrary points A1, A2 to An-1, An of the leading edge 18c in the order of radially getting away from the entrance point A toward a tip line. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an axial flow pump attached to an openable / closable still water gate door installed at a boundary of a water channel, a column type axial flow pump or a diagonal flow pump used for drainage of a reservoir, and the like. The present invention relates to a pump device and a pump gate device including an impeller attached to a blade boss and formed so that a suction side leading edge of the blade is a retracted blade.

  Conventionally, the blade leading edge of the impeller used in this type of pump device is designed to make the flow in the impeller uniform, and to achieve high pump performance, the larger the diameter from the rotation center shaft, the more forward the flow of the flow is. The forward wing shape located on the side was adopted.

  However, when foreign matter contained in water, especially long foreign matters such as cloth-like foreign matter and fibers get entangled with the leading edge of the wing, the centrifugal force accompanying the rotation of the impeller that tries to move the foreign matter toward the outer circumferential direction On the other hand, since the blade leading edge hinders its movement, there is a problem that the inside of the impeller is blocked due to accumulation of cloth-like foreign matters and long foreign matters entangled with the blades. A technique has been proposed that employs a swept blade shape that is located on the wake side of the flow as the diameter increases.

JP 2003-129996 A

  However, even the impeller of the pump device adopting the conventional swept blade shape described above cannot surely eliminate the entanglement of cloth-like foreign matters or long foreign matters, and in reality, maintenance due to the entanglement of foreign matters is not possible. Had to be forced.

  In view of the above-mentioned problems, the present inventor has come up with a condition of a swept wing that hardly causes the entanglement phenomenon of cloth-like foreign matters or long foreign matters by performing earnest trial and error.

  An object of the present invention is to provide a pump device and a pump gate device in which the entanglement phenomenon of cloth-like foreign matters and long foreign matters hardly occurs.

  In order to achieve the above-mentioned object, the first characteristic configuration of the pump device according to the present invention is attached to the blade boss and the leading edge of the suction side of the blade is retracted as described in claim 1 of the claims. A pump apparatus including an impeller formed so as to be a wing, along a blade surface from an entrance point A to an exit point B of a boss line formed at a joint portion of the blade boss and the blade proximal end side Point A1, A2 with respect to the shortest distance L and the arbitrary points A1, A2,..., An-1, An of the leading edge in the order of moving away from the entrance point A to the chip line in the radial direction. ,..., An−1, An and the shortest distances L1, L2,..., Ln−1, Ln along the blade surface from the exit point B are L ≧ L1 ≧ L2 ≧. Provided with an impeller in which the leading edge is formed so as to satisfy the relationship of Ln-1 ≧ Ln Located in.

  According to the above-described configuration, the pump device can be operated without impairing the efficiency, and even when the cloth-like foreign material or the long foreign material that has flowed into the pump device is entangled with the suction side leading edge of the blade. In order to smoothly move to the tip line side along the front edge by the action of the flow of water in the flow direction of the water by the impeller and the action of the centrifugal force by the rotation and out of the gap between the impeller and the casing, To greatly reduce the possibility of causing a situation such as stoppage of operation of the pump device for removing cloth-like foreign matters and long foreign matters wound around the impeller, and to improve the operating rate of the pump device. Become.

  In the second characteristic configuration, as described in claim 2, in addition to the first characteristic configuration described above, the impeller includes a front edge proximal end side and a front edge other end side from a rotation axis of a main shaft. The angle formed by the lines along the radial direction connecting the two is set at 90 degrees or less.

  If the shortest distance shown in the first characteristic configuration is configured such that L ≧ L1 ≧ L2 ≧... ≧ Ln-1 ≧ Ln, the occurrence of entanglement of cloth-like foreign matters and long foreign matters is reduced accordingly. As a result, the angle formed by the line connecting the leading edge base end side and the leading edge other end side from the rotation axis of the main shaft becomes large, and a large torsional moment is generated at the blade root, which is easily damaged. There is a problem that a problem arises. Therefore, by setting the angle to 90 degrees or less, it becomes possible to effectively eliminate the entanglement of cloth-like foreign matters and long foreign matters while ensuring a predetermined strength. Needless to say, the lower limit is greater than 0 degrees.

  In the third feature configuration, as described in claim 3, in addition to the second feature configuration described above, the impeller includes a front edge proximal end side and a front edge other end side from a rotation axis of a main shaft. The angle formed by the lines along the radial direction connecting the two is set to 60 degrees or less.

  If the shortest distance shown in the first characteristic configuration is configured such that L ≧ L1 ≧ L2 ≧... ≧ Ln-1 ≧ Ln, the occurrence of entanglement of cloth-like foreign matters and long foreign matters is reduced accordingly. As a result, the angle formed by the line connecting the leading edge base end side and the leading edge other end side from the rotation axis of the main shaft becomes large, and a large torsional moment is generated at the blade root, which is easily damaged. There is a problem that the pump efficiency is lowered. Therefore, by setting the angle to 60 degrees or less, it becomes possible to effectively eliminate the entanglement of cloth-like foreign matters and long foreign matters while ensuring the predetermined strength and the predetermined pump efficiency. Furthermore, it is preferable to set it to 50 degrees or less. Needless to say, the lower limit is greater than 0 degrees.

  In addition to any one of the first to third feature configurations described above, the fourth feature configuration includes the casing or the inner surface of the casing liner facing the tip line, as described in claim 4. A groove for allowing foreign matters to pass from the upstream side to the downstream side of the impeller is provided.

  By providing a groove in the casing or the casing liner, even when the cloth-like foreign matter or the long foreign matter entangled with the blade of the impeller is caught without being discharged from the gap between the impeller and the casing, As the vehicle rotates, foreign matter is introduced into the groove, passes through the groove, and is discharged downstream. Therefore, the pump device can be stably operated without causing a situation that the operation is stopped due to the foreign matter biting into the gap between the impeller and the casing.

  The first characteristic configuration of the pump gate device according to the present invention is the water stop gate door body that can open and close the pump device having any one of the first to fourth characteristic configurations described above. It is in the point attached to.

  According to the above-described configuration, the pump gate device can be stably operated without causing a situation in which the operation is stopped due to a foreign matter biting into the gap between the impeller and the casing.

  As described above, according to the present invention, it is possible to provide a pump device and a pump gate device in which the entanglement phenomenon of cloth-like foreign matters and long foreign matters hardly occurs.

  Embodiments of the pump gate according to the present invention will be described below. As shown in FIG. 3, the pump gate 3 is installed in the boundary part which is a confluence | merging point of the 1st waterway 1 (for example, tributary river) and the 2nd waterway 2 (for example, mainstream river). As shown in FIGS. 1 to 3, the pump gate 3 is made of a concrete that supports a sluice column 4 (4 b) standing at the boundary, a floor member 4 c laid horizontally at the bottom of the water channel, and a lifting mechanism 7. A water stop gate 6 made of a steel plate is supported on the floor 4 (4a) by an elevating mechanism 7 so as to be opened and closed.

  The elevating mechanism 7 directly connects a pair of rack rods 7a fixed to the water blocking gate door body 6 through a joint 7b and a pinion gear in a gear box 7c disposed on the upper part of the water gate pillar 4 (4a). An electric motor 7f that rotates or reversely drives, a manual operation handle 7d, and a drive coupling mechanism 7e that drives the other gear box 7c side in conjunction with the electric motor 7f that is drivingly coupled to the one gear box 7c side. The water stop gate door body 6 supported by the rack bar 7a by rotating the pinion gear by the electric motor 7f or the manual operation handle 7d can be moved up and down.

  A pair of left and right through holes are formed in the central portion of the water stop gate body 6 so that the water channels 1 and 2 communicate with each other. The water stop gate in which the water stop gate door body 6 descends in each through hole. In the posture, a pump device 11 for draining from the first water channel 1 to the second water channel 2 is installed.

  As shown in FIG. 4, the pump device 11 is installed so that the shaft center is in a horizontal posture, and a cylindrical pump casing 20 having a circular cross section in which an internal space serves as a discharge passage, and the pump casing 20 Mounted on the motor main body 16 that is received through a plurality of guide vanes 19 that are accommodated so that their axes coincide with each other and are spaced apart in the circumferential direction, and the tip of the main shaft 17 that protrudes from the motor main body 16 And an impeller 18 formed.

  A suction cover 22 is flange-connected to one end side of the pump casing 20, and a flap valve mechanism 12 capable of closing the discharge flow path is flange-connected to the other end side.

  The suction cover 22 is a cylindrical body having a circular cross section, and a tip opening 22a having a diameter enlarged in a trumpet shape is formed with respect to the axis of the pump casing 20 so that the suction can be stably suctioned to a low water level. Curved so as to be in an obliquely downward posture. A ring-shaped casing liner 21 made of a harder metal than the suction cover 22 is provided on a surface facing the impeller 18 in an inner peripheral portion of the suction cover 22.

  The flap valve mechanism 12 includes a valve body 12b having one end side pivotally supported around the horizontal axis 12P on the other end side of the cylindrical portion 12a that is flange-connected to the pump casing 20, When the pump device 11 is operated, it swings to the open posture by the discharge pressure of the water sucked from the suction cover 22, and when the pump device 11 is stopped, it swings to the closed posture by its own weight to prevent backflow. At the end of the cylindrical portion 12a, there is a switch 12c whose contact is actuated by a projection 12d provided on the inner lower portion of the valve body 12b in order to detect whether the valve body 12b is in an open position or a closed position. Is provided.

  The motor body 16 includes an oil chamber 16a having a mechanical seal 26 on the impeller 18 side, and sequentially includes a submersion chamber 16b, a first motor chamber 16c, and a second motor chamber 16d in the direction of the casing discharge port 20a. An electric motor M is disposed between the first motor chamber 16c and the second motor chamber 16d.

  A downward oil drain passage 28a and a water drain passage 28b communicating with the outside are formed at the lower ends of the oil chamber 16a and the submerged reservoir chamber 16b, respectively. An oil drain plug 30 and an infiltration water drain plug 31 as an inspection plug are detachably attached to the lower end of 28b.

  The pump casing 20 supports a cable protection rubber 32 that protects the power supply line PL to the electric motor M, the signal line of the switch 12c, and the like, and the power supply line PL that passes through the cable protection rubber 32 and the like. The first motor chamber 16c is guided through a cable introduction pipe 33 formed in a part of the guide vane 19.

  The impeller 18 is composed of a blade boss 18a rotatably attached to the main shaft 17 and four blades 18b bolted to the blade boss 18a, as shown in FIGS. 5 (a) to 5 (d). Further, the suction side front edge 18c of the blade 18b is formed to be a retracted blade.

  The shortest distance L along the blade 18b surface from the entrance point A to the exit point B of the boss line 18d formed at the joint between the blade boss 18a and the blade base end side, and the diameter from the entrance point A to the tip line 18e. .., A9, A10 with respect to the arbitrary points A1, A2,..., A9, A10 of the leading edge 18c in the order of moving away from the direction, the points from the points A1, A2,. The shortest distances L1, L2,..., L9, L10 along the blade 18b surface satisfy the relationship L = L1 = L2 =... L9 = L10, and the rotational axis P of the main shaft 17 is further satisfied. The angle θ formed by a line along the radial direction connecting the leading edge proximal end side A and the leading edge other end side A10 is 45 degrees. By configuring L = L1 = L2 =... = L9 = L10, the value of θ is relatively small, and the pump efficiency can be maintained at a relatively high value. Here, the tip line refers to an edge of the blade 18b that faces the casing (suction cover 22) or the casing liner 21.

  That is, even when cloth-like foreign matters or long foreign matters that have flowed into the pump device 11 are entangled with the suction-side front edge 18c of the blade 18b, the action of the flow in the direction of water flow by the impeller 18 is achieved. By the action of the centrifugal force due to the rotation, it smoothly moves toward the tip line 18e along the front edge 18c and flows out from the gap between the impeller 18 and the casing liner 21.

  Here, L = L1 = L2 =... = L9 = about 10 points from A1 to A10 as arbitrary points of the front edge 18c in the order of moving away from the entrance point A to the tip line 18e in the radial direction. The case where the relationship of L10 is satisfied has been described, but n points from A1 to An (n is an integer) as an arbitrary point of the leading edge 18c in the order of moving away from the entry point A to the tip line 18e in the radial direction. As long as the relationship of L ≧ L1 ≧ L2 ≧... ≧ Ln-1 ≧ Ln is satisfied, the exit points from the points A1, A2,. The values of the shortest distances L1, L2,..., Ln-1, Ln along the blade surface up to B are not particularly limited as long as the above relationship is satisfied, and the designed impeller 18 Set appropriately according to the turning radius of It is possible.

  However, the angle θ formed by a line along the radial direction connecting the rotation axis of the main shaft 17 to the proximal end side of the front edge 18c and the other end side of the front edge 18c is preferably 90 degrees or less. If it is larger, a large torsional moment is generated at the blade root, which causes a problem that it is easily damaged, and there is a problem that the pump efficiency is lowered. Therefore, by setting the angle to 90 degrees or less, it becomes possible to effectively eliminate the entanglement of cloth-like foreign matters and long foreign matters while ensuring the predetermined strength and the predetermined pump efficiency. From the viewpoint of strength, 90 degrees or less is preferable, and considering efficiency, it is preferable to set it to 60 degrees or less, and further to 50 degrees or less. Needless to say, the lower limit is greater than 0 degrees.

  Furthermore, as shown in FIG. 4, the casing liner 21 and the tip line are provided with a gap of several millimeters so that the passage of foreign matter is allowed but the pump efficiency is not lowered. However, a groove 21 a having a width of 20 mm and a depth of 3.5 mm in the direction parallel to the main shaft 17 is formed on the inner peripheral surface of the casing liner 21 from the upstream side to the downstream side of the impeller 18. Are provided in three places so as to equally divide the inner circumferential circle.

  As a result, when a cloth-like foreign matter or a long foreign matter contained in the water sucked from the suction cover 22 is entangled with the impeller 18, the foreign matter moved in the radial direction along the front edge 18c Even when it is sandwiched between the two, it passes through the groove 21 a provided in the casing liner 21 and passes through the impeller 18.

  A pump device having a nominal diameter of 300 mm provided with a reverse blade impeller having the above-described configuration (having a groove in the casing liner 21), and a pump device having a nominal diameter of 300 mm having a reverse blade impeller having the above-described configuration (in the casing liner 21). No groove) and a pump device with a nominal diameter of 300 mm (with no groove in the casing liner 21) equipped with an impeller having a normal forward blade shape without a backward blade shape, vinyl as a foreign object during the operation of the pump device: 250 Table 1 shows the passing rate of the impeller when throwing × 350 mm / 3 g, curtain tape 50 × 1000 mm / 14 g, trapeze: Φ12 × 1000 mm / 45 g or hand towel: 340 × 340 mm / 34 g.

  From Table 1, it was proved that the pump device provided with the groove on the casing liner and provided with the impeller of the swept wing allows almost cloth-like foreign matters and long foreign matters to pass through. Even when the casing liner is not provided with a groove, it has been demonstrated that a pump device equipped with a swept impeller impeller has a higher rate of passage of long foreign objects than a pump device equipped with a forward impeller impeller. It was.

  In the pump device 11 described above, an angle (retraction angle) formed by a line along the radial direction connecting the leading edge proximal end side A and the leading edge other end side A10 from the rotation axis P of the main shaft 17 is 45 degrees. 5 and 6A configured as described above and the radial direction connecting the leading edge proximal end side A and the leading edge other end side A10 from the rotational axis P of the main shaft 17 to the rotation axis P. 6 (b), which is configured so that the angle (retraction angle) formed by the line is 40 degrees, a hand towel: 340 × 340 mm / 34 g is introduced, and then the pump device is operated by an inverter. Table 2 shows the impeller passing rate when the motor is driven and the rotational speed is gradually increased.

  A swept wing having an angle (receding angle) of 40 degrees along a radial direction connecting the rotation axis P of the main shaft 17 to the leading edge proximal end side A and the leading edge other end side A10 is a boss line 18d. Point A1, A2,..., A9, A10 with respect to the shortest distance L along the surface of the blade 18b from the entrance point A to the exit point B, and the points A1, A2,. ..., the shortest distances L1, L2, ..., L9, L10 along the blade 18b surface from A9, A10 to the exit point B are L≥L1≥L2≥ ... ≥L9≥L10. Does not satisfy the relationship. A swept wing having an angle (retracted angle) of 45 degrees formed from a line along the radial direction connecting the rotation axis P of the main shaft 17 to the front edge base end side A and the front edge other end side A10 is L The relationship of ≧ L1 ≧ L2 ≧... ≧ L9 ≧ L10 was satisfied, and as is clear from Table 2, it was proved that more foreign matters are allowed to pass through.

  Another embodiment will be described below. In the above-described embodiment, the configuration in which the groove 21 a is provided on the inner peripheral surface of the casing liner 21 has been described. However, in the case of the casing 20 without the casing liner 21, the groove 21 a is formed on the inner peripheral surface of the casing 20. It may be formed along the flow direction generated by the rotation of. Further, the shape and the number of grooves are not particularly limited, and are appropriately designed within a range where desired effects are achieved.

  In the above-described embodiment, the configuration in which the groove 21a is provided on the inner peripheral surface of the casing liner 21 has been described. However, the groove is not essential, and according to the present invention, a certain effect can be obtained without necessarily providing the groove 21a. It is done.

  In the above-described embodiment, the case where the present invention is applied to an axial flow pump in which the tip line is parallel to the rotation axis of the pump has been described. However, the impeller of the pump device according to the present invention has the tip line serving as the rotation axis of the pump. It is also possible to apply to a mixed flow pump with an angle.

  In the above-described embodiment, the impeller is configured with four blades. However, the number of blades is not particularly limited, and may be appropriately designed within a range where the desired effect can be achieved. is there.

  In the embodiment described above, the impeller of the pump device according to the present invention is applied to the horizontal axis pump device of the pump gate. However, the present invention is applied to a vertical pump device that pumps water from a reservoir like a column type pump device. It is also possible to do. Furthermore, the impeller according to the present invention is not limited to the axial flow impeller, and may be a mixed flow impeller.

  The specific structure, material, dimensions, and the like of each part described in the above-described embodiment are not particularly limited, and are appropriately designed within the scope of the effects of the present invention.

Front view of pump gate according to the present invention Front view of pump gate according to the present invention (A) Top view of the pump gate according to the present invention, (b) Plan sectional view of the main part of the pump gate according to the present invention Cross-sectional view of the pump device according to the present invention (A) Perspective view of impeller in pump device according to the present invention, (b) Perspective view of essential part of impeller blades in pump device according to the present invention, (c) Plan view of impeller blades in pump device according to the present invention (D) The meridian shape explanatory drawing of the blade | wing of the impeller in the pump apparatus by this invention (A) is explanatory drawing of the reverse wing | blade by this invention, (b) is explanatory drawing of the reverse wing | blade which is not equipped with the characteristic of the backward wing | blade by this invention

Explanation of symbols

1: First water channel 2: Second water channel 3: Pump gate 4: Gate 4a: Sluice column 4b: Floor member 4 Concrete floor board 6: Water stop gate door body 7: Lifting mechanism 7a: Rack bar 7b: Electric motor 7c : Gear box 7d: Manual operation handle 7e: Drive coupling mechanism 11: Pump device 12: Flap valve 15: Suction pipe 16: Motor body 16a: Oil chamber 16b: Submerged chamber 16c: Motor chamber 1
16d: Motor chamber 2
17: Main shaft 18: Impeller 18a: Blade boss 18b: Blade 18c: Front edge 18d: Boss line 18e: Tip line 19: Guide vane 20: Casing 20a: Casing discharge port 21: Casing liner 21a: Groove 22: Suction cover 22a: Suction cover suction port 22b: Suction cover discharge port 26: Mechanical seal 28a: Oil drain channel 28b: Water drain channel 30: Oil drain plug 31: Submerged drain plug 32: Cable protection rubber 33: Cable introduction pipe

Claims (5)

A pump device provided with an impeller attached to a blade boss and formed such that a suction side leading edge of the blade is a retracted blade,
The shortest distance L along the blade surface from the entrance point A to the exit point B of the boss line formed at the joint between the blade boss and the blade base end side, and the order of moving away from the entrance point A to the tip line in the radial direction .., An-1, An with respect to the arbitrary points A1, A2,..., An-1, An of the leading edge, the blades from the points A1, A2,. The leading edge is formed so that the shortest distances L1, L2,..., Ln-1, Ln along the surface satisfy the relationship of L ≧ L1 ≧ L2 ≧ ... ≧ Ln-1 ≧ Ln. Pump device with impeller.   2. The pump device according to claim 1, wherein an angle formed by a line along a radial direction connecting the leading edge proximal end side and the leading edge other end side from the rotation axis of the main shaft is set to 90 degrees or less. .   3. The pump device according to claim 2, wherein an angle formed by a line along a radial direction connecting the leading edge base end side and the leading edge other end side from the rotation axis of the main shaft is set to 60 degrees or less. .   The pump device according to any one of claims 1 to 3, wherein a groove for allowing foreign matter to pass from an upstream side to a downstream side of the impeller is provided on an inner peripheral surface of a casing or a casing liner facing the tip line. .   A pump gate device comprising the pump device according to any one of claims 1 to 4 attached to a water stop gate door that can be freely opened and closed.