JP4557536B2 - Pump device - Google Patents

Description

  The present invention relates to an improvement of a pump device used for forced removal of agricultural water, forced drainage to rivers, countermeasures against inundation, manhole pump stations, sewage treatment plants, and the like.

  Conventionally, according to this type of axial flow or mixed flow pump device, a plurality of motor housings of submersible motors are arranged in a cylindrical casing with predetermined intervals in the circumferential direction as guide vanes for guiding the water flow. The gap is formed between the inner peripheral surface of the cylindrical casing and the outer peripheral surface of the motor housing, and the flow path is used as a flow path (see, for example, Patent Document 1). .

  And the water sucked from the suction port of the casing by the rotational drive of the impeller provided in the submersible motor passes through the flow path between the inner peripheral surface of the casing and the outer peripheral surface of the motor housing under the guidance of each stationary blade. It was set as the structure discharged from the discharge port of a casing.

Japanese Patent Laid-Open No. 2003-13879

  However, according to the pump device having the conventional structure, since all the stationary blades are provided between the inner peripheral surface of the casing and the outer peripheral surface of the motor housing, the foreign matter that has passed through the impeller is at the upstream end of the stationary blades. There was a great risk of clogging across the edge.

  Therefore, the problem to be solved by the present invention is to provide a pump device that effectively prevents such clogging of foreign matters with respect to the stationary blade and improves the passage performance of foreign matters.

The technical means for solving the above-described problem is that an axial flow or mixed flow pump device in which a motor housing of a submersible motor is fixed in a cylindrical casing, and a stationary blade is provided between the casing and the motor housing. The stationary blades are provided from the upstream side to the downstream side of the water flow caused by the rotation of the impeller of the submersible motor, and the stationary support stationary blade that fixes the motor housing with a space from the inner peripheral surface of the casing. And a non-supporting stationary blade that does not support the motor housing by the space passage , and the fixed supporting stationary blade and the non-supporting stationary blade are arranged at a predetermined interval in the circumferential direction .

  The space passage may be provided on the outer peripheral end portion side of the non-supporting stationary blade, or the space passage may be provided on the inner peripheral end portion side of the non-supporting stationary blade.

  Further, the impeller may be arranged on the suction inlet side of the casing with respect to each stationary blade, or the impeller may be arranged on the discharge outlet side of the casing with respect to each stationary blade. Good.

  Moreover, it is good also as a structure by which the at least most upstream end of the said water flow which flows in the said casing in the said non-supporting stationary blade was made into the inclination edge which inclines toward the downstream with respect to the said space channel direction.

  According to the pump device of the first aspect, the stationary support stationary blade that fixes the motor housing with a space from the inner peripheral surface of the casing, and the upstream side to the downstream side of the water flow caused by the rotation of the impeller of the submersible motor. A foreign passage that passes through the suction port in the casing by the rotational drive of the impeller is separated from the inner peripheral surface of the casing and the motor. Because the guide is guided to the discharge port of the casing through the space passage of the unsupported stationary blade that does not extend over the entire length of the outer peripheral surface of the housing, clogging of the foreign material to the unsupported stationary blade can be effectively prevented, and the passage performance of the foreign material is improved. I can plan. Therefore, the frequency of maintenance due to the clogging of foreign matter is also reduced, and the quality of the pump device can be improved.

  Furthermore, as compared with the conventional structure in which all the stationary blades span the entire length of the inner peripheral surface of the casing and the outer peripheral surface of the motor housing, the weight of the entire pump device is reduced by providing a space passage. There is also an advantage that can be achieved.

  According to the pump device according to claim 2, in the pump device according to claim 1, the space passage has a structure provided on the outer peripheral end side of the non-supporting stationary blade, As with the pump device described in 1., it is possible to effectively prevent clogging of foreign matter against the unsupported stationary blade, improve the passage performance of foreign matter, reduce the frequency of maintenance caused by clogging of foreign matter, improve quality and reduce weight. There is an advantage that can be achieved.

  Furthermore, according to the pump device according to claim 3, in the pump device according to claim 1, the space passage has a structure provided on the inner peripheral end side of the non-supporting stationary blade, As in the pump device described in No. 1, the clogging of foreign matter with respect to the non-supporting stationary blade can be effectively prevented, the passage performance of the foreign matter can be improved, the frequency of maintenance due to the clogging of foreign matter is reduced, quality improvement and weight There is an advantage that can be reduced.

  According to the pump device according to claim 4, in the pump device according to claim 2, the impeller is arranged on the suction port side of the casing with respect to each stationary blade, and the upstream side Since the water flow sucked from the suction port by the rotational drive of the impeller located at the position tends to be guided toward the outer peripheral surface of the flow path in the casing, the foreign matter that has passed through the impeller is There is an advantage that it is efficiently guided to the discharge port of the casing through the space passage provided on the part side, and the clogging of foreign matter with respect to the unsupported stationary blade can be more effectively prevented.

  Furthermore, according to the pump device according to claim 5, in the pump device according to claim 3, the impeller is arranged on the discharge port side of the casing with respect to each stationary blade, and the downstream side Since the water flow sucked from the suction port by the rotational drive of the impeller located at the position tends to be guided in the direction of the inner peripheral surface of the flow path in the casing, the foreign matter that has passed through the suction port There is an advantage that it is efficiently guided to the discharge port of the casing through the space passage provided on the peripheral end side, and the clogging of foreign matter with respect to the non-supporting stationary blade can be prevented more effectively.

  According to the pump device according to claim 6, in the pump device according to any one of claims 1 to 5, at least the most upstream end of the water flow flowing in the casing of the unsupported stationary blade is a space passage. The foreign object that strikes the inclined edge of the non-supporting stationary blade is guided in the direction of the space passage along the inclination of the inclined edge. Then, since it is guided to the discharge port of the casing through the space passage, there is an advantage that clogging of foreign matters with respect to the non-supporting stationary blade can be more effectively prevented.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIGS. 1 and 2 show an axial flow pump device 1 detachably mounted on a pump gate or the like provided in the middle of a drainage route to a river. It is mainly comprised from the cylindrical casing 2 and the submersible motor 3 arrange | positioned in the casing 2. As shown in FIG.

  The casing 2 is formed in a substantially cylindrical shape, and the casing 2 includes a suction casing portion 7 that surrounds the outer periphery of the impeller 5 attached to the drive shaft 4 of the submersible motor 3, and oil for mechanical seal of the submersible motor 3. Guide casing portion 9 surrounding the outer periphery of the oil housing portion 8 constituting the oil chamber in which the water is stored and the water storage chamber for storing the infiltrated water, and the outer periphery of the main body housing portion 10 in which the stator and rotor of the submersible motor 3 are stored. And a discharge casing portion 13 surrounding the outer periphery of a substantially conical guide housing portion 12 that guides the other end portion of the main body housing portion 10 is sequentially connected.

  In the present embodiment, the motor housing 14 on the submersible motor 3 side includes the oil housing portion 8 and the main body housing portion 10 that are connected to each other, and the guide housing portion 12 that is continuously arranged.

  The motor housing 14 of the submersible motor 3 is fixed via a stationary blade 16 with a predetermined distance from the inner peripheral surface of the casing 2. In the present embodiment, the shaft center of the casing 2 and the shaft of the submersible motor 3 are fixed. The core is structured so as to be positioned substantially coaxially, and the water sucked from the suction port 7a of the suction casing portion 7 by the rotational drive of the impeller 5 as shown by the arrow in FIG. The discharge port 13a of the discharge casing portion 13 discharges through a flow path 17 formed by a gap formed between the inner peripheral surface of the casing 2 and the outer peripheral surface of the motor housing 14.

  The stationary blades 16 are provided at four locations in the radial direction orthogonal to each other. In the present embodiment, a pair of fixed support stationary blades 16a for fixing and supporting the motor housing 14 to the casing 2, and a motor housing. 14 is configured to include a pair of non-supporting stationary blades 16b that do not directly support 14.

  That is, as shown in FIG. 2, a pair of upper and lower stationary blades 16 opposed in the radial direction are fixed support stationary blades 16a, and the motor housing 14 is supported at a predetermined position with respect to the casing 2. The other pair of left and right stationary blades 16 facing each other in the radial direction is an unsupported stationary blade 16b.

  Each non-supporting stationary blade 16b protrudes in the horizontal direction from the outer peripheral surface of the motor housing 14, and has a structure having a space of an appropriate width with the inner peripheral surface of the casing 2 on the outer peripheral end side. As shown in FIG. 1, each unsupported stationary blade 16b and the inner peripheral surface of the casing 2 have a structure in which a space passage 18 continuous from the upstream side to the downstream side of the water flow caused by the rotation of the impeller 5 is provided. ing.

  Further, in the present embodiment, the motor housing 14 is formed of the oil housing part 8, the main body housing part 10, and the guide housing part 12, and the guide casing part 9, the main body casing part 11, and the discharge casing of the casing 2, respectively. The unit 13 is supported in a fixed state by a pair of upper and lower fixed support vanes 16a, and has a structure in which a pair of left and right non-support vanes 16b protrudes. The structure is arranged in the same row along the flow direction of the path 17. Here, the space passage 18 provided on the outer peripheral end portion side of each non-supporting stationary blade 16 b has a structure that is continuously arranged along the flow direction of the flow path 17.

  In the present embodiment, the oil housing portion 8, the guide casing portion 9, the pair of fixed support vanes 16a and the pair of non-support vanes 16b are integrally formed of a casting, The main body casing portion 11, the pair of fixed support vanes 16a and the pair of non-support vanes 16b are integrally formed by casting, and the guide housing portion 12, the discharge casing portion 13, the pair of fixed support vanes 16a, The pair of unsupported stationary blades 16b are integrally formed of a casting and are connected to each other. The oil housing portion 8, the guide casing portion 9, the pair of fixed support stationary blades 16a, The pair of unsupported stationary blades 16b and the like may be formed separately from each other and connected to each other by welding, screw fastening, or the like.

  The present embodiment is configured as described above, and the foreign matter that has passed through the suction port 7a of the suction casing portion 7 in the casing 2 by the rotational drive of the impeller 5 is the flow path 17 between each stationary blade 16 or each casing portion. Since it is guided to the discharge port 13a of the discharge casing part 13 through the space passage 18 between the inner peripheral surfaces of the 9, 11, 13 and the non-supporting stationary blades 16b, the foreign matter is clogged with respect to the non-supporting stationary blades 16b. Can be effectively prevented, and the clogging of foreign matters straddling each stationary blade 16 can be effectively reduced, and the passage performance of foreign matters can be improved. Accordingly, the frequency of maintenance due to the clogging of foreign matter is also reduced, and the quality of the pump device 1 can be improved.

  Furthermore, as compared with a conventional structure in which all the stationary blades extend over the entire length of the inner peripheral surface of the casing and the outer peripheral surface of the motor housing, the weight of the pump device 1 as a whole is provided by providing the space passage 18. There is an advantage that can be reduced.

  Moreover, in this embodiment, since the impeller 5 is arrange | positioned rather than each stationary blade 16 at the suction inlet 7a side of the casing 2, it is sucked from the suction inlet 7a by the rotational drive of the impeller 5 located in an upstream. Since the water flow tends to be guided in the direction of the outer peripheral surface of the flow path 17 in the casing 2, foreign matter that has passed through the impeller 5 is also guided in the outer peripheral surface direction, and the foreign matter is guided to the outer peripheral end of the unsupported stationary vane 16b. It is possible to efficiently guide to the discharge port 13a of the casing 2 through the space passage 18 provided on the side, and there is an advantage that clogging of foreign matter with respect to the unsupported stationary blade 16b can be more effectively prevented.

  FIG. 3 shows a second embodiment, and the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  That is, in the present embodiment, each space passage 18 is provided on the inner peripheral end side of each unsupported stationary blade 16b. Other structures are the same as those in the first embodiment.

  Accordingly, in the present embodiment as well, as in the first embodiment, the foreign matter that has passed through the suction port 7a due to the rotational drive of the impeller 5 is the flow path 17 between the stationary blades 16 and the housing portions 8, 10, 12 Are guided to the discharge port 13a through a space passage 18 between the outer peripheral surface of each non-supporting stationary blade 16b and each non-supporting stationary blade 16b, so that clogging of foreign matter with respect to each non-supporting stationary blade 16b can be effectively prevented, and the foreign matter passage performance is improved. Therefore, the frequency of maintenance due to clogging of foreign matters is reduced, so that the quality of the pump device 1 can be improved and the weight of the pump device 1 as a whole can be reduced.

  FIG. 4 shows a third embodiment, and the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  That is, in the present embodiment, at least the uppermost stream end of the water flow flowing in the casing 2 in each row of the unsupported stationary blades 16b is the inclined edge 16c that is gradually inclined toward the downstream side with respect to the direction of the space passage 18. It is structured. Other structures are the same as those in the first embodiment.

  Accordingly, in the present embodiment as well, as in the first embodiment, the foreign matter that has passed through the suction port 7a due to the rotational drive of the impeller 5 is caused by the flow path 17 between the stationary blades 16 and the casing portions 9, 11, and 13. Since the non-supporting stationary blades 16b are guided to the discharge port 13a through the space passage 18 between the inner peripheral surface of each of the non-supporting stationary blades 16b, it is possible to effectively prevent clogging of foreign matter with respect to the respective non-supporting stationary blades 16b. There is an advantage that improvement can be achieved, the frequency of maintenance due to clogging of foreign matters is reduced, the quality of the pump device 1 can be improved, and the weight of the pump device 1 as a whole can be reduced.

  Further, since the water flow sucked from the suction port 7a by the rotational drive of the impeller 5 positioned on the upstream side tends to be guided toward the outer peripheral surface of the flow path 17 in the casing 2, the foreign matter that has passed through the impeller 5 Can also be guided to the discharge port 13a of the casing 2 efficiently through the space passage 18 provided on the outer peripheral end side of the non-supporting stationary blade 16b. There is also an advantage that clogging of foreign matters can be more effectively prevented.

  At this time, the foreign matter colliding with the inclined end edge 16c of each non-supporting stationary blade 16b is efficiently guided in the direction of the outer peripheral space passage 18 along the inclination of the inclined end edge 16c. Therefore, there is an advantage that clogging of foreign matter with respect to the unsupported stationary blade 16b can be more effectively prevented.

  FIG. 5 shows a fourth embodiment, and the same components as those in the second embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  That is, in this embodiment, the portion surrounding the outer periphery of the impeller 5 is the discharge casing portion 13, the portion surrounding the outer periphery of the guide housing portion 12 is the suction casing portion 7, and the impeller 5 The structure is arranged closer to the discharge port 13 a of the casing 2 than the blade 16. And at least the most upstream end of the water flow which flows in the casing 2 in each unsupported stationary blade 16b row | line | column is made into the structure made into the inclined edge 16c which inclines gradually toward the downstream with respect to the space path 18 direction. Other structures are the same as those in the second embodiment.

  Accordingly, in the present embodiment as well, as in the second embodiment, the foreign matter that has passed through the suction port 7a due to the rotational drive of the impeller 5 is transferred to the flow path 17 between the stationary blades 16 and the housing portions 8, 10, 12. Are guided to the discharge port 13a through a space passage 18 between the outer peripheral surface of each non-supporting stationary blade 16b and each non-supporting stationary blade 16b, so that clogging of foreign matter with respect to each non-supporting stationary blade 16b can be effectively prevented, and the foreign matter passage performance is improved. Therefore, the frequency of maintenance due to clogging of foreign matters is reduced, so that the quality of the pump device 1 can be improved and the weight of the pump device 1 as a whole can be reduced.

  Further, since the water flow sucked from the suction port 7a by the rotational drive of the impeller 5 located on the downstream side tends to be guided in the direction of the inner peripheral surface of the flow path 17 in the casing 2, it has passed through the impeller 5. Foreign matter is also guided in the direction of the inner peripheral surface, and the foreign matter can be efficiently guided to the discharge port 13a of the casing 2 through the space passage 18 provided on the inner peripheral end side of the non-supporting stationary blade 16b. There is also an advantage that clogging of foreign matter with respect to the blade 16b can be more effectively prevented.

  At this time, the foreign matter colliding with the inclined end edge 16c of each non-supporting stationary blade 16b is efficiently guided in the direction of the space passage 18 on the inner peripheral side along the inclination of the inclined end edge 16c. Since it is guided to the second discharge port 13a, there is an advantage that clogging of foreign matter with respect to the non-supporting stationary blade 16b can be more effectively prevented.

  In each of the above embodiments, the casing 2 is divided into a plurality of casing parts 9, 11, and 13 and each is provided with a fixed support vane 16a and a non-support vane 16b. As long as the motor housing 14 of the submersible motor 3 can be fixedly supported, a structure in which only some of the casing portions 9, 11, and 13 include the fixed support stationary blade 16 a and the unsupported stationary blade 16 b may be employed.

  Further, the number of the stationary blades 16 is not limited to the number of the embodiments, and the number of the stationary supporting stationary blades 16a and the non-supporting stationary blades 16b may be appropriately increased or decreased as necessary.

  Furthermore, although the structure by which the space channel | path 18 was provided in the outer peripheral end part side or inner peripheral end part side of each non-supporting stationary blade 16b is shown, it is from between the outer peripheral surface of the motor housing 14 and the inner peripheral surface of the casing 2. A structure in which the space passage 18 is provided in the middle portion of the non-supporting stationary blade 16b that is formed so as to be opposed to each other may be used.

  Further, the inclined end edge 16c is not limited to the most upstream end of the non-supporting stationary blade 16b, but may be formed at other portions.

  Further, the pump device 1 is exemplified for a pump gate, but it may be a structure used in a manhole pumping station or the like, and is not limited to the axial flow pump device 1 but also a mixed flow. The pump device 1 may be used and is not limited to the structure of the embodiment.

It is a modified cross-section explanatory drawing which shows the 1st Embodiment of this invention. It is the II-II sectional view taken on the line in FIG. It is a cross-sectional schematic explanatory drawing which shows 2nd Embodiment. It is a cross-sectional schematic explanatory drawing which shows 3rd Embodiment. It is a section schematic explanatory view showing a 4th embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pump apparatus 2 Casing 3 Submersible motor 5 Impeller 7 Suction casing part 7a Suction port 8 Oil housing part 9 Guide casing part 10 Main body housing part 11 Main body casing part 12 Guide housing part 13 Discharge casing part 13a Discharge port 14 Motor housing 16 Static Blade 16a Fixed support vane 16b Non-support vane 16c Inclined edge 17 Flow path 18 Space passage

Claims (6)

In an axial flow or mixed flow pump device in which a motor housing of a submersible motor is fixed in a cylindrical casing, and a stationary blade is provided between the casing and the motor housing ,
A stationary support vane in which the stationary blade fixes the motor housing with a space from the inner peripheral surface of the casing, and a space provided from the upstream side to the downstream side of the water flow caused by the rotation of the impeller of the submersible motor. An unsupported stationary blade that does not support a motor housing by a passage , and the fixed supported stationary blade and the unsupported stationary blade are arranged at a predetermined interval in the circumferential direction . The pump device according to claim 1,
The pump device, wherein the space passage is provided on an outer peripheral end side of the unsupported stationary blade. The pump device according to claim 1,
The pump device, wherein the space passage is provided on an inner peripheral end side of the non-supporting stationary blade. The pump device according to claim 2,
The pump device, wherein the impeller is arranged closer to the suction port of the casing than the respective stationary blades. The pump device according to claim 3,
The pump device, wherein the impeller is arranged closer to the discharge port side of the casing than the stationary blades. The pump device according to any one of claims 1 to 5,
The pump device according to claim 1, wherein at least an uppermost stream end of the water flow flowing in the casing in the unsupported stationary blade is an inclined end edge inclined toward a downstream side with respect to the space passage direction.

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