JP2014047748A - Impeller for water pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an impeller for a water pump capable of reducing vibration by suppressing generation of axial thrust, adjusting both of mechanical balance in air and water power balance in water, and reducing failure due to clogging and entangling of foreign matters and the like without degrading pump efficiency, and not causing cost up of a product due to increase in size of the pump, with respect to the impeller having one blade or one flow channel.SOLUTION: A reaction force generation plate 9 is disposed in a recessed portion 4b of an impeller 4 having one blade or one flow channel in a pump casing 7 at a lower end of a submersible motor 1, a boss portion 4e is disposed to be mounted on an end of a submersible motor shaft 2, a cover 5 is mounted on an upper end of the recessed portion 4b by a fastening tool 12 in a state of not projecting from an upper end face 4d of a main plate, a hole 5a larger than a boss portion outer side wall 4h is formed on the cover, the water is introduced into the recessed portion 4b by communicating between the inside and outside of the recessed portion 4b, and a joining portion of the cover 5 and an annular groove 4g is sealed by a seal material 11.

Description

  The present invention relates to an impeller for a water pump.

  Conventionally, there are various types of impellers for water pumps, and in impellers that send sewage, etc., solid matter contained in sewage must be discharged without clogging the water passage of the impeller. A “non-clog pump” as defined in JIS B 0131 term number 1323 and shown in FIG. 25, a “bladeless pump” as defined in term number 1325, or a term 1324 as defined in FIG. There is known an impeller having a single blade or a single passage for a centrifugal pump suitable for discharging sewage and filth used in a “screw impeller centrifugal pump” as shown.

  And since the impeller as described above has a non-axisymmetric shape with respect to the center of rotation, the static or dynamic mechanical balance is adjusted in the air before being installed in the pump and operated. The mechanical balance in the air is to prevent the pump from being damaged when the test operation is confirmed when the pump is installed or when the pump becomes no-load operation due to a failure of the water level sensor or control circuit. For example, by removing the portion where the unbalanced mass of the mechanical balance exists, the main plate or the side plate is provided with a recess, or a balance weight that balances the unbalanced mass at the axially symmetric position where the unbalanced mass exists. It is adjusted by mounting.

  However, in an underwater operation state having a density about 800 times larger than that of air, the fluid reaction force received inward in the radial direction as the reaction force of water flowing out of the impeller non-axisymmetrically is large. Collapses and generates intense vibrations as the impeller rotates.

  Therefore, in order to solve the above-described problems, the rear and front auxiliary blades are attached to the outside of the main plate and the side plate of the impeller at a substantially axially symmetrical position of the discharge port of the main passage of the bladeless pump impeller. A structure having a structure in which the sum of the fluid reaction forces of the auxiliary blades and the fluid reaction force due to the reaction of water discharge in the main passage is balanced is known (see, for example, Patent Document 1).

  An impeller in which an unbalanced mass that generates a centrifugal force that balances a fluid reaction force due to a reaction of water discharge in the main passage is provided at a circumferential position where the fluid reaction force is generated is also known (for example, Patent Documents). 2).

  In addition, in order to adjust the mechanical balance, when the thickness of the unbalanced mass is removed and the main plate or side plate is provided with a recess, the impeller is lighter, the material cost is reduced, and the cooling rate difference of each part during casting is reduced. If the wall thickness is made equal in order to reduce the size and improve the casting accuracy, the shape of the recess inevitably reflects the shape of the blade or the flow path, so the recess is also non-axisymmetric about the rotation center. At the same time, the volume of the concave portion at a predetermined angular position is also determined. When the impeller is rotated underwater with the non-axisymmetric shape of the concave portion opened, power loss due to fluid disturbance occurs. Therefore, for example, as shown in JP-A-2006-291937, the recess is covered with a lid, but by providing the lid, water that has entered the recess is confined in the recess, Impeller Since the vibration increases due to the non-axisymmetric centrifugal force acting on the water in the recess as the water rotates, the circumferential position at which the fluid reaction force is generated in order to effectively use the centrifugal force When the impeller is driven and rotated in water by forming a filling space filled with fluid inside the impeller and partitioning with a partition wall so that the filling space has a predetermined angle range, An impeller configured to cancel the fluid reaction force by a centrifugal force acting on a fluid filled in the space is also known (for example, see Patent Document 3).

Japanese Utility Model Publication No. 44-3708 JP-A-57-86599 JP 2010-31807 A

  However, as a result of conducting a verification experiment using the configurations of Patent Documents 1 to 3, it has been found that there are the following problems.

  First, in the configuration of Patent Document 1, shaft power is increased by projecting the back and front auxiliary blades that do not act as a pumping function of the pump outside the main plate and side plate of the impeller. As a result, the pump efficiency is significantly reduced, and the effect of reducing vibrations is almost ineffective unless the width of the rear and front auxiliary blades in the direction of the underwater motor shaft is large. In the end, the pump itself becomes large and extra manufacturing costs occur. In addition, when the above invention is applied to the discharge of sewage that can contain foreign substances, the boss portion for mounting the submersible motor shaft and the rear surface Foreign matter is clogged between the auxiliary vane and the front auxiliary vane and the outer wall of the impeller inlet, or soft foreign matter such as hair is entangled with the rear and front auxiliary vanes. Overload and pump damage due to restraint of the impeller (locked), has the problem of performance degradation, wear maintenance of pulling the pump due needed.

  Moreover, in the structure of the said patent document 2, since the unbalance mass which generate | occur | produces the centrifugal force which balances the fluid reaction force by the reaction of the water discharge action of a main channel | path was provided, this mechanical balance in air | atmosphere will be destroyed this time. Therefore, it is impossible to adjust both the mechanical balance in the air and the hydraulic balance in the water, and the centrifugal force acting on the unbalanced mass is a centrifugal force, so it is only in the direction toward the radially outward direction. Therefore, in order to cancel the fluid reaction force, it can be mounted only in the vicinity of the angle where the fluid reaction force acts, so the degree of freedom in design is reduced, and the mounting position of the unbalanced mass adjusts the mechanical balance. A single blade non-clog that cannot be mounted when the balance weight is in the same position as the balance weight, and the particle size of the foreign material is 100% of the pump aperture ratio. In a partial flow rate range where the flow rate is low and the head is high, the impeller is designed to minimize the deterioration of pump performance due to the back flow of water in the flow channel. Since the shape of the internal flow path is almost the same as the particle size of the foreign substance, there is a problem that the particle size of the foreign substance decreases if the unbalanced mass is provided in the flow channel inside the impeller. .

  Further, in the configuration of Patent Document 3, since the centrifugal force acting on the fluid filled in the filling space is a centrifugal force, it acts only in the outward direction in the radial direction. In order to cancel the force, it can be attached only in the vicinity of the angle at which the fluid reaction force acts, so the degree of design freedom is low, and in order to utilize the centrifugal force acting on the fluid filled in the filling space, Compared with Patent Document 2 that uses centrifugal force acting on a solid that is mainly a metal, a larger space is required. For example, the specific gravity of the fluid is 1 (water) and the specific gravity of the solid is 7.8 (stainless steel cast steel ), The shape of Patent Document 3 requires about 7.8 times the space of the shape of Patent Document 2, and the impeller having a non-axisymmetric shape about the center of rotation has a mechanical balance. Not to adjust When removing the portion where the mating mass exists and providing the concave portion, the shape of the blade is copied to become the non-axisymmetric shape of the filling space, so that the required angle is coupled with the need for the large space described above. If the balance weight that balances the unbalanced mass needs to be installed at the axisymmetric position where the unbalanced mass exists in order to adjust the mechanical balance, the balance weight Since the filling space is compressed and the filling space becomes narrower, it is very difficult to secure a space for filling the fluid enough to generate the centrifugal force necessary for the angle at which the fluid reaction force acts, In order to use the centrifugal force acting on the fluid in the filling space, it is essential that the fluid does not flow into the concave portion that does not function as the filling space. If air remains in the concave portion that does not function, buoyancy acts on the impeller due to the difference in specific gravity with water, which has a larger specific gravity than air, resulting in imbalance, and as another method the function does not function as a filling space. When the concave portion is filled with a solid material such as an impeller material, it becomes an unbalanced mass, resulting in an unbalance, resulting in a problem of increased vibration.

  In addition to the above, as shown in, for example, Japanese Patent Publication No. 28-005840, in an impeller for a bladeless pump formed by a single flow path, a suction port opened at the lower end surface of the impeller is used. Since the flow path is formed so as to wind up to the discharge port opened on the peripheral surface of the impeller, the depth of the concave portion continuously decreases toward the downstream in the rotation direction of the impeller. When the concave portion is covered with a lid in order to reduce power loss, it is shown in FIGS. 2, 21 and 22 of the present invention. As the impeller rotates in the water, the water introduced into the recess moves and the flow path is wedge-shaped in the continuously shallow portion, so that the water flows downstream. While gradually turning upward in the direction of motor shaft lead-out As shown in FIG. 22, in addition to being expanded and depressurized because the flow path is suddenly expanded from the wedge shape in the region where the pressure is deepened by being inserted, the flow is rapidly expanded from the wedge shape. Due to the synergistic low-pressure action in which a low pressure is generated in the recess when the flow is separated from the falling side wall surface of the enlarged recess, in a non-uniform pressure distribution state of the pressurization portion having a shallow recess depth and the low-pressure portion having a deep recess portion, The problem is that the axial thrust acts in the downward direction of the submersible motor shaft and the vibration increases due to the pressure difference with the space on the upper end surface of the lid that communicates with the pumping pump flow path of the pump casing whose pressure is higher than in the recess. have.

  Therefore, in view of the above-mentioned problems, the present invention reduces the fluid reaction force even in an impeller having a single blade or a single flow path having a non-axisymmetric shape with respect to the center of rotation, and is surely hydraulic. In addition to adjusting the balance, it is possible to reduce the vibration by reducing the centrifugal force acting on the water introduced in the recess provided for mechanical balance, and further to the downstream of the impeller in the rotational direction. For example, even in an impeller for a bladeless pump, the generation of the axial thrust is suppressed after the depth of the concave portion continuously becomes shallower and then has a shape that becomes deeper than the shallower slope. Vibration can be reduced, and both the mechanical balance in the air and the hydraulic balance in the water can be adjusted, and troubles caused by clogging or entanglement due to foreign matters mixed in the sewage can be generated without reducing pump efficiency. Hardly, and an object thereof is to provide a for water pump impeller that does not result in product price increase due to extra manufacturing cost increase in the size of the pump.

  In order to achieve the above-mentioned problem, first, as described in Patent Document 2, the fluid reaction force is applied to a circumferential position where a fluid reaction force is exerted by a reaction of a water discharge action of a main passage of the impeller whose mechanical balance is adjusted. In the examination of application of a general method of adding an unbalanced mass that generates a balanced centrifugal force, the fluid reaction force and the position in the circumferential direction on which the fluid reaction force acts are actually measured, or three-dimensional CAD (Computer Aided Design): It can be obtained by modeling the impeller and pumping flow channel by computer-aided design) and numerically analyzing the model, but the single blade with the passing particle size of foreign matter being 100% of the pump aperture ratio In non-clog pumps or bladeless pumps with a single flow path, flow is limited in the partial flow rate range where the flow rate is low and the lift is high. The shape of the flow path inside the impeller is almost the same as the particle size of the foreign matter in order to minimize the deterioration of pump performance due to the backflow of water in the passage. When the balance mass is provided, the particle diameter of the foreign matter decreases, and when the unbalance mass is provided on the main plate or the side plate, the attachment position of the unbalance mass is a balance weight for adjusting the mechanical balance; A problem was found that the required amount could not be installed when the same position was reached.

  Next, as in Patent Document 1, auxiliary blades that are auxiliary blades for generating an inward reaction force in the radial direction that balances the fluid reaction force due to the reaction of the water discharge action of the main passage are connected to the main plate of the impeller. By considering to provide a position that is substantially axisymmetric with respect to the circumferential position where the fluid reaction force acts on the outside of the side plate, with the rotation of the impeller in water, Most of the force that the auxiliary blade receives from the water when the inclined auxiliary blade collides with water and diverts (discharges) the water outward in the radial direction is schematically shown in FIG. 26 of the present invention. Thus, the force Fw applied to the auxiliary blade in the vertical direction and received from the water can be divided into a circumferential component force Fu and a radial component force Fh, which can be considered as the reaction force Fh. Has the effect of canceling out the fluid reaction force Fk, and Since the auxiliary blades in Document 1 are in two locations, the main plate and the side plate, for example, it is sufficient to generate a reaction force that balances half of the fluid reaction force. Since the rear and front auxiliary blades that do not act as a pumping function of the pump are provided on the outside, the shaft power is increased, thereby significantly reducing pump efficiency and the rear auxiliary blades outside the main plate. In FIG. 28, as schematically shown in FIG. 28 of the present invention, assuming that the submersible motor shaft 2 is a lever and the bearing Br is a fulcrum, the fulcrum is changed to an action point. Since the distance B from the “fulcrum” to the back auxiliary blade, which is the “power point”, is shorter than the distance A from the center height position 4 k of the water outflow portion of the impeller 4 on which the fluid reaction force Fk acts, the distance A > Distance B, for example In order to obtain a moment that balances half of the fluid reaction force Fk, a force that is half the fluid reaction force Fk × (distance A ÷ distance B) times is required. Since the reaction force Fh generated by this operation has to be increased, the pump itself becomes large and an extra manufacturing cost is generated. Therefore, the front auxiliary blade outside the side plate is shown in FIG. 28, the distance C from the “fulcrum” to the front auxiliary blade, which is the “power point”, is longer than the distance A, so the distance A <distance C, and (distance A ÷ distance C) <1, Although it seems that the front auxiliary blades can be made smaller, since the suction port 4l of the impeller 4 having a diameter larger than the boss portion 4e on the main plate 4a side is on the side plate side, the radial installation range of the front auxiliary blades is the entire circumference. Because it narrows over the water It is necessary to increase the width in the direction in which the motor shaft 2 is led out to increase the reaction force Fh, and the side plate-side annular gap G3 composed of the outer wall of the side plate and the side wall of the pump casing 7 facing the side wall, and the suction side of the side plate The front auxiliary vane is circulated by the circulating flow R generated from the high pressure pumping flow path toward the low pressure inlet through the axial gap G4 on the side plate side that is the gap between the end face and the end face of the pump casing 7 facing the end face. As a result, entanglement of soft foreign matter on the surface and stirring by the front auxiliary blade promoted reduction of the pump head due to clogging of foreign matter in the gap between the rotating part and the stationary part and pressure leakage in the pumping flow path.

  Therefore, in order to eliminate the above problems, the inventor of the present application removes an unnecessary thick portion of the main plate from the outside of the impeller underwater motor shaft direction to form a concave portion, and protrudes from the upper end surface of the main plate. A new structure is provided in which a reaction force generating plate is provided in the recess so as not to come out. With this structure, the distance B will inevitably approach the distance A. Since the reaction force generated by the reaction force generating plate to balance the force can be reduced, the effect of reducing the width of the reaction force generating plate in the direction in which the underwater motor shaft is led out also acts synergistically. However, if the recess is to be made as deep as possible in order to provide the reaction force generating plate that generates the necessary reaction force, the shape of the recess necessarily dictates the shape of the blade or impeller internal flow path. Therefore, the recess is also the center of rotation When the mechanical balance is adjusted in accordance with the shape after the thinning, the balance weight balances the unbalanced mass at the axially symmetric position where the unbalanced mass exists in the recess. Depending on the shape of the impeller and the circumferential position of the recess due to the balance weight, the shape of the recess such as “shallow”, “deep”, “narrow”, “wide” Because of the difference, it has been found that the circumferential position where the fluid reaction force acts does not necessarily have a shape suitable for providing the reaction force generation plate having a required size.

  For this purpose, the inventor of the present application is that the impeller has one blade or one flow path, so that the shape of the recess is “shallow” and “deep” in an axially symmetric position, and the balance weight is attached. It is found that “narrow” and “wide” exist in axially symmetric positions, and the reaction force generating plate redirects (discharges) water outward in the radial direction as schematically shown in FIG. Thus, if the reaction force is generated inward in the radial direction, the reaction force generation plate, which is the opposite, changes the water inward in the radial direction as schematically shown in FIG. In order to demonstrate this, the inventors have created a new technical idea that it is also possible to generate a reaction force in the radially outward direction. The shape in the recess at the axially symmetric position is the balance Since it is “narrow” due to the presence of the acid, the water is directed radially outwardly to the axially symmetric position of the circumferential position where the fluid reaction force acts to receive the radially inward reaction force. In the impeller that cannot be provided with a reaction force generating plate, as shown schematically in FIG. 27, by turning water inward in the radial direction to a circumferential position where the fluid reaction force acts, The reaction force generating plate that generates a reaction force radially outward is provided for testing, and in that case, the static or dynamic mechanical balance in the air is adjusted to determine whether the vibration has been reduced. As a result of determining the vibration value by installing an accelerometer in the three axis directions of the pump discharge direction and the horizontal direction perpendicular to the pump discharge direction and the submersible motor shaft lead-out direction, the pump is increased in size and the annular gap on the side plate side G3 and the side plate side Although it was confirmed that clogging into the gap G4 can be prevented and vibration can be reduced without any problems with the above-mentioned shape, fluid disturbance due to rotation in water with the non-axisymmetric shape of the recess opened. Because power loss is generated by the pump, pump efficiency is poor, and entanglement of soft foreign matter on the reaction force generation plate is not improved, so generation of power loss due to fluid disturbance and entry of foreign matter into the recess is suppressed A communication path that connects the inside and the outside of the recess for attaching the lid that covers the recess to the impeller and supplying water into the recess to generate the reaction force on the reaction force generation plate. Although the pump efficiency and the entanglement of soft foreign matter on the reaction force generation plate were improved by providing the lid on the lid, on the other hand, there was a new problem that the vibration that had been reduced once again became large again. By the way The cause is that the water that has entered into the recess having a non-axisymmetric shape is confined by providing a lid, and the non-axisymmetric water in the recess is rotated as the impeller rotates in water. It was estimated that it was caused by the acting non-axisymmetric centrifugal force.

  Therefore, an impeller in a state where water is poured into the concave portion of the impeller whose mechanical balance has been adjusted and the concave portion is sealed with a lid and a sealing material is used for dynamic immobilization in the air using a balancing machine. Measure the balance mass and the position at which it acts, calculate the centrifugal force acting on the water in the recess based on the measured value, and place it in a position to offset the centrifugal force acting on the water introduced into the recess. As a result of re-testing with one reaction force generation plate attached, it is practically problematic compared to an impeller in which vibration is increased again at a position where only the fluid reaction force is offset. The vibration value is reduced to a level that does not exceed the level, and even if one reaction force generation plate is attached at a position that cancels out the resultant force of the fluid reaction force and the centrifugal force acting on the water introduced into the recess, When the result is obtained, the actual machine verification using the balancing machine is measured. From the calculation of the centrifugal force based on the value and the calculation result of the centrifugal force acting on the water in the recess by analyzing the model by modeling the impeller with the three-dimensional CAD, In view of time and cost, a verification method based on model analysis of the three-dimensional CAD is desirable.

  However, in general, water pumps are used in series with multiple motor outputs and different frequencies depending on the performance and application. Among them, the motor output is low, the power supply frequency is high, or the pole is Since the number of impellers is fast because of the small number, the outer diameter of the impeller is reduced in order to suppress the load to the rated value. Since it may not be possible to attach a reaction force generation plate having an appropriate size at one location, the present inventor divides the reaction force generation plate into two parts based on the above-mentioned invention, one of which is the blade. As the vehicle rotates in water, the water moving in the circumferential direction in the concave portion is changed inward in the radial direction to receive a reaction force in the outward radial direction, and the other is the impeller. In the recess as the water rotates in water By distributing the water moving in the circumferential direction outward in the radial direction and receiving the reaction force inward in the radial direction, each is distributed at 180 ° with respect to the submersible motor shaft. Since the reaction force in the same direction can be generated even if the force generation plate is divided into two, the impeller is provided with the reaction force generation plate that generates the necessary reaction force even if the recess outer peripheral diameter is small. And the centrifugal force acting on the larger fluid reaction force and the water introduced into the recess by forming the reaction force generation plate after the division into the same size as before the division. If the reaction force generating plate is divided into one that cancels the fluid reaction force and one that cancels the centrifugal force acting on the water introduced into the recess. , One large reaction force generation plate is connected to four small reaction force generation Since the raw plate can be divided and disposed in the recess, the split reaction force generation plate of the present invention can be used even in a water pump using a narrow impeller between the outer periphery of the recess and the outer periphery of the boss. It was confirmed.

  In addition, since the fluid reaction force is for the flow discharged from the impeller, the magnitude of the fluid reaction force and the position of the acting circumferential direction will inevitably change if the pump discharge amount fluctuates. Therefore, the reaction force generating plate is formed to have a certain angular range in the circumferential direction, and a reaction force in the radial direction is generated in the range where the reaction force generating plate exists although it is large or small. Therefore, even if the circumferential position on which the fluid reaction force acts changes as the pump discharge amount changes, the fluid in the circumferential range where the reaction force generation plate exists or in the axially symmetric position thereof Although it is possible to reduce the reaction force to reduce the vibration, for example, as shown in FIGS. 18 to 20, the reaction force generating plate is detachably provided on the lower end surface of the lid or the bottom surface in the recess. If configured, at the site where the pump is actually installed By replacing the reaction force generating plate in the optimum shape and installation position according to the actual operation discharge amount and installing it on the impeller, the amount of fluid reaction force by the reaction force generating plate is increased. Since they can be offset, vibration can be further reduced.

  Furthermore, as shown in FIGS. 10 to 12, the reaction that is a portion where water moving in the circumferential direction in the recess as the impeller rotates in water first collides with the reaction force generating plate. If the upstream end of the force generation plate in the impeller rotation direction is inclined from the attachment surface side of the reaction force generation plate toward the opposite attachment surface side toward the downstream side in the impeller rotation direction, the impeller As a result of the swirling action caused by the water force of water moving in the circumferential direction along the rotation of the water in the recess, it is possible to prevent soft foreign substances contained in the water from being entangled with the reaction force generating plate. As shown in FIG. 13, the outward reaction in the radial direction is caused by diverting the water that moves in the circumferential direction in the concave portion in the radial direction as the impeller rotates in the water. The upstream end of the reaction force generating plate receiving the force in the impeller rotation direction is the outer periphery of the recess. 14 or as another means, the water moving in the circumferential direction in the recess is turned radially outward as the impeller rotates in water as shown in FIG. If the upstream end of the reaction force generating plate that receives the inward reaction force in the radial direction is connected to the outer wall of the boss portion, a convex portion that is likely to be entangled with soft foreign matter contained in water. In addition, since the clearance between the reaction force generation plate and the impeller rotating direction can be eliminated from the upstream end of the reaction force generation plate, the entanglement of the soft foreign material and the clogging of the foreign material can be suppressed. In addition, the water that moves in the circumferential direction in the recess can be efficiently guided to the reaction force generation plate, so that the reaction force generated can be increased.

  The lid is provided with a communication path that connects the inside and outside of the recess to supply water to the reaction force generation plate to generate a reaction force, but there is a gap formed by the main plate and the lid. If it is not sealed, water will leak out of the recess due to centrifugal force acting on the water in the recess as the impeller rotates, and in order to compensate for the leak, Since water is introduced into the recess, water will continue to flow into the recess during pump operation, and if there is a possibility that foreign matter will be mixed in such as sewage, the foreign matter will gradually get into the recess. If the sealing structure is used by using a sealing material at the joint between the main plate and the lid, the imbalance may occur due to accumulation on the surface, resulting in increased vibration and damage to the pump. When the water is filled with water, no further water can enter, so It is possible to the suppress vibrations since it is possible to prevent deposition.

  Next, with the aim of further reducing vibrations, the present inventor described in paragraph 0013 “in a non-uniform pressure distribution state in the pressure-increasing portion having a shallow concave portion and the low-pressure portion having a deep concave portion than in the concave portion. `` The problem is that the axial thrust acts in the downward direction of the submersible motor shaft and the vibration increases due to the pressure difference with the space at the top end surface of the lid that communicates with the pumping pump flow path of the pump casing with high pressure. '' Therefore, a new technical concept is created in which a shielding plate that shields water moving in the circumferential direction in the concave portion as the impeller rotates in water is provided in the rapidly deepening portion or in the vicinity thereof upstream. Therefore, in order to verify this, as shown in FIG. 29, the shielding plate is provided at one place at each position in the circumferential direction such as position A, position B, position C, and position D. When measuring vibration values in a configuration, As shown in FIGS. 29 and 30, the corresponding position in each circumferential direction where the shielding plate is provided is an intermediate diameter between the outer peripheral diameter φDo of the recess and the outer diameter φDb of the boss portion in the falling side wall surface 4 o of the deepest shape that sharply deepens. The blades of the shielding plate that are installed every 90 ° with respect to the position A of the intersection 4m with φDm and that the water moving in the circumferential direction collides with the rotation of the impeller in water as the impeller rotates in water The upstream side wall in the vehicle rotation direction measures vibration values at each position while being formed at each position approximately perpendicular to the water moving in the circumferential direction in the recess so that no excessive reaction force is generated. As a result, it has been found that the vibration value decreases in the order of position A <position D <position B <position C, and as a result, the flow path suddenly increases from the wedge shape at the site where it becomes deeper as shown in paragraph 0013 and FIG. Because it is enlarged, the flow of water is expanded and depressurized. In addition to the above, the flow is separated from the falling side wall surface of the enlarged concave portion to suppress a synergistic low pressure action that generates a low pressure in the concave portion. As shown in FIG. 23, it is preferable to install a shielding plate and a reaction force generation plate, so that the vibration value is smaller when the shielding plate is provided than when only the reaction force generation plate is installed. Thus, it was confirmed that the vibration reduction effect of the reaction force generation plate and the shielding plate acts synergistically.

  When the reaction force generation plate and the shielding plate are provided on the impeller, if the mechanical balance in the air is adjusted so as to be compatible with the hydraulic balance in water, the reaction force generation plate and the It is necessary to provide a balance weight that balances the reaction force generation plate and the mass of the shielding plate at the axially symmetrical position of the shielding plate. In this case, the weight of the impeller is reduced, the material cost is reduced, and each part is cooled during casting. It is desirable to reduce the balance weight as much as possible from the need to reduce the speed difference and suppress the occurrence of sink marks and voids to improve casting accuracy. To that end, the reaction force generation plate and the shielding plate are made small. Since the reduction is effective even when the shape of the present invention is applied to an impeller having a small outer diameter, the reaction force generation plate must generate a reaction force necessary to reduce vibration. For example, the blade of FIG. Will be described with reference to the explanatory view showing the positional relationship between the bearing Br and the position that receives the fluid reaction force Fk and the reaction force Fh, the fluid reaction acting on the “action point” separated from the bearing Br “fulcrum” by a distance A. When the distance from the “fulcrum” to the “power point” is the same as the distance A, Fk = Fa and when the distance from the “fulcrum” is shorter than the distance A, Fk <Fk If the distance A is longer than the distance A, Fk> Fa. Therefore, as shown in FIG. 7, the installation position in the submerged motor shaft lead-out direction is that of the water outflow portion of the impeller on which the fluid reaction force Fk acts. The closer to the center height position, the smaller the reaction force Fh corresponding to the drag Fa necessary for canceling out the fluid reaction force Fk and the centrifugal force Fc acting on the water introduced into the recess. From the reaction force generation plate Since it can be configured to be light and lightweight, the balance weight that opposes it can also be reduced in weight, and the reaction force generating plate can be installed in a “deeper” direction at each axially symmetric position of the recess. Since a long distance from the fulcrum to the force point can be secured, the reaction force Fh corresponding to the drag Fa can be further reduced, so that the reaction force generating plate can be made as small as possible.

  Further, by forming the reaction force generating plate into a blade shape, specifically, the shape of the reaction force generating plate in a horizontal cross section perpendicular to the underwater motor shaft as shown in FIG. The rear side wall on the opposite side compared to the flow direction length of the direction-changing side wall on the side that diverts the water moving in the circumferential direction in the concave portion in accordance with the rotation of the inner side in the radial direction. If the reaction force generating plate is formed to be longer, the flow velocity of the back side wall is higher than the direction side wall due to the difference in the path of water flowing from the upstream end to the downstream end in the impeller rotation direction of the reaction force generation plate. As a result, the pressure on the back side wall decreases and a pressure difference is generated between the both side walls of the reaction force generation plate, and the component number 8162 of JISB0131 is a component force perpendicular to the direction of the geometric mean speed of the inflow speed and the outflow speed. Is generated, the reaction force is generated by the amount of the lift. It is possible to increase the reaction force generated, it is possible to reduce the reaction force generating plate.

  Further, when the reaction force generating plate turns the water that moves in the circumferential direction in the concave portion in accordance with the rotation of the impeller in water inward or outward in the radial direction, it is shown in FIG. Thus, when the mounting angle θ of the reaction force generating plate with respect to the flow of water moving in the circumferential direction in the recess is 0 ° and 90 ° (shielding), no radial reaction force Fh is generated and the mounting Since the maximum value is obtained when the angle θ is 45 °, the mounting angle θ has an inclination of about 45 ° with respect to the water moving in the circumferential direction in the recess as the impeller rotates in water. If formed, the reaction force generating plate can be formed to the minimum necessary size.

  Further, regarding the downsizing of the shielding plate, the peripheral speed of the water moving in the concave portion becomes far from the center, that is, the peripheral speed acting on the water increases toward the outer periphery of the concave portion. From the inner periphery side of the full width shielding plate in the radial direction between the outer periphery of the boss portion and the outer periphery of the concave portion, the length is shortened by a length corresponding to 30% and 40% of the total width and 50% corresponding to the intermediate diameter φDm position. As a result of the test, even if the inner circumference side is shortened by 30% and 40% with respect to the vibration reduction effect of the full width concave plate, there is no significant difference in the effect. In addition to the fact that the vibration is slightly increased even if the side is shortened, but it has been found that the level is not problematic in practice, the upper end surface of the shielding plate shields the water moving in the circumferential direction in the recess. Therefore, it is better to have the same surface as the bottom surface of the annular groove that is the lid mounting surface. Although the vibration reducing effect is high, it was confirmed that there is no practical problem even if it is formed about several millimeters below the lid mounting surface for weight reduction and processing escape.

  Furthermore, within the verification installation range shortened by a length corresponding to 30%, 40%, and 50% of the total width from the inner peripheral side of the shielding plate, the circumference of the recess is increased as the impeller rotates in water. Either the fluid reaction force or the centrifugal force acting on the water introduced into the recess by receiving a radially outward reaction force by turning the water moving in the radial direction inward By installing the reaction force generating plate configured to reduce or cancel one or the other, the upstream end of the reaction force generating plate is connected to the outer peripheral wall of the recess, and the downstream side thereof If the end portion is formed to extend to a position where the intermediate diameter φDm is less than or equal to the outer periphery of the recess and the outer periphery of the boss portion, the function of the shielding plate can be added to the reaction force generating plate. There is no need to provide a separate plate, making the impeller lighter It can be of.

  Further, in the case where the reaction force generation plate is close to the upstream side wall of the balance weight in the impeller rotation direction or in the balance weight range position, either one of the reaction force generation plate and the shielding plate or the mounting position of the other side In the case of the shielding plate, if the upstream side wall of the balance weight has the shape of the reaction force generating plate having the function of the shielding plate, the reaction force generating plate or the shielding plate and the balance weight can be integrated. Since the concave portion can be formed in a simple and compact manner, the clogging and entanglement of foreign matters can be further suppressed, and the impeller can be reduced in weight and manufactured easily.

  As described above, the specific means based on the configuration that has been reached after trial and error are as follows.

  In the invention according to claim 1 of the present invention, it has a single blade or a single flow passage which is built in a pump casing attached to the lower end of the submersible motor and emphasizes the passage of foreign matters rotating around the submersible motor shaft. In the impeller for a water pump, when the impeller rotates in water, it receives a fluid reaction force against the flow discharged from the impeller inward in the radial direction, and a recess formed in the main plate of the impeller. The central portion is provided with a boss portion to be attached to the guided tip portion of the submersible motor shaft, and includes a lid that covers the concave portion, and the communication path that communicates the inside and outside of the concave portion for introducing water into the concave portion in water In the air, a drain hole for discharging water in the concave portion is formed in the lid, and the inside of the concave portion is rotated in the water as the impeller rotates in water. Radial water moving in the circumferential direction A reaction force generating plate that receives a reaction force in either the outward or inward direction in the radial direction by changing the inward or outward direction is provided in the recess. And the resultant reaction force generated by the reaction force generating plate reduces or cancels out the resultant force of the fluid reaction force and the centrifugal force acting on the water introduced into the recess. It is the most important feature.

  In the water pump impeller according to claim 1 of the present invention, the invention according to claim 2 of the present invention is characterized in that two or more reaction force generating plates are provided in the recess, and the impeller rotates in water. In addition, the fluid reaction force is reduced or offset by the reaction force generated by at least one of the reaction force generation plates, and the reaction force generated by at least one other of the reaction force generation plates causes the reaction force in the recess. The centrifugal force acting on the water introduced into the water is reduced or offset.

  Further, in the water pump impeller according to claim 1 or 2 of the present invention, the invention according to claim 3 of the present invention is such that the shallow portion and the deep portion where the reaction force generating plate can be provided are axisymmetric. The reaction force generation plate is provided on the side where the depth of the recess is deeper in the recess existing at the position.

  Furthermore, in the impeller for water pumps according to any one of claims 1 to 3 of the present invention, the invention according to claim 4 of the present invention provides an opening on a peripheral surface of the impeller that receives the fluid reaction force. The reaction force generating plate is formed so as to oppose the central height position of the water outflow portion.

  Further, in the water pump impeller according to any one of claims 1 to 4, the invention according to claim 5 of the present invention is characterized in that the horizontal cross-sectional shape of the reaction force generating plate is the impeller. With respect to the flow direction length of the direction-changing side wall, which is the side that turns the water that moves in the circumferential direction in the concave portion in accordance with the rotation of the water in the radial direction inward or outward. The opposite back side wall is formed to have a longer blade cross-sectional shape.

  Further, in the impeller for water pump according to any one of claims 1 to 5, the invention according to claim 6 of the present invention is the rotation of the impeller in water of the impeller. Accordingly, the mounting angle of the entire side wall of the turning side, which is the side that turns the water that moves in the circumferential direction in the concave portion to either the inward or outward direction in the radial direction, Is formed with an inclination of 45 ° with respect to the flow of water moving in the circumferential direction in the concave portion as the rotation of.

  Further, in the water pump impeller according to any one of claims 1 to 6, the invention according to claim 7 of the present invention is an upstream side of the reaction force generating plate in the impeller rotation direction. The end portion is configured to be inclined toward the downstream side in the impeller rotation direction from the mounting surface on the bottom surface of the recess or the back surface of the lid of the reaction force generation plate toward the mounting surface.

  Furthermore, in the impeller for water pumps according to any one of claims 1 to 7, the invention according to claim 8 of the present invention is characterized in that the inside of the concave portion is caused by the rotation of the impeller in water. The upstream end of the reaction force generating plate receiving the reaction force in the radial direction is changed into the recess by rotating the water moving in the circumferential direction inward in the radial direction. Inward in the radial direction by turning the water that is connected to the outer peripheral wall or moves radially in the recess as the impeller rotates in water in the radial direction. The upstream end of the reaction force generating plate that receives the reaction force in the rotational direction of the impeller is connected to the outer wall of the boss portion.

  Furthermore, in the water pump impeller according to any one of claims 1 to 7 of the present invention, the invention according to claim 9 of the present invention is characterized in that the reaction force generation plate is placed in the water of the impeller. A reaction force generating plate that receives an outward reaction force in the radial direction by diverting the water moving in the circumferential direction in the concave portion in accordance with the rotation of Each of the reaction plates is divided into two reaction force generating plates that receive a reaction force in the radial direction by turning the water that moves in the circumferential direction in the recesses in the radial direction with the rotation of The force generating plate is configured to be provided at a 180 ° position with respect to the submersible motor shaft.

  Next, in the water pump impeller according to any one of claims 1 to 8 of the present invention, the invention according to claim 10 of the present invention is characterized in that the reaction force generating plate is placed in the water of the impeller. A reaction force generating plate that receives an outward reaction force in the radial direction by diverting the water moving in the circumferential direction in the concave portion in accordance with the rotation of Each of the reaction plates is divided into two reaction force generating plates that receive a reaction force in the radial direction by turning the water that moves in the circumferential direction in the recesses in the radial direction with the rotation of The force generation plate is arranged at 180 ° with respect to the submersible motor shaft so as to be provided with different radial distances.

  In the water pump impeller according to any one of claims 1 to 10, the invention according to claim 11 of the present invention is such that the reaction force generating plate is the impeller, the lid, or both. It is configured to be removable and replaceable.

  Moreover, in the impeller for water pumps according to any one of claims 1 to 11 of the present invention, the invention according to claim 12 of the present invention is characterized in that the concave portion is directed toward the downstream in the impeller rotation direction. After the depth of the concave portion becomes continuously shallow, it has a shape that becomes deeper than the shallow slope, and moves in the circumferential direction in the concave portion as the impeller rotates in water. A shielding plate that suppresses the momentum of water is provided so as to protrude from the outer peripheral wall of the recess toward the center of the underwater motor shaft, and its inner peripheral end is equal to or less than the intermediate diameter between the outer periphery of the concave and the outer periphery of the boss. The upstream side wall of the shield plate in the direction of rotation of the impeller is formed at right angles to the flow of water moving in the circumferential direction in the recess, and the impeller is at the intermediate diameter. The deepest part of the shape that suddenly deepens from the shallower gradient with respect to the rotation direction The intersection between the intermediate diameter is 0 ° in 落込 side wall, the upstream side wall of the shielding plate is formed so as to be located in a range of less than 90 ° on the upstream side of the impeller rotation direction.

  Furthermore, in the impeller for water pumps according to any one of claims 1 to 4 and 6 and 10, the invention according to claim 13 of the present invention is such that the recess is directed downstream in the rotational direction of the impeller. After the depth of the concave portion becomes continuously shallow, it has a shape that becomes deeper than the shallowing gradient, and moves in the circumferential direction in the concave portion as the impeller rotates in water. Either or both of the fluid reaction force and the centrifugal force acting on the water introduced into the recess by receiving a radially outward reaction force by turning the water to be radially inward The upstream end of the reaction force generating plate configured to reduce or cancel out is connected to the outer peripheral wall of the recess, and the downstream end is intermediate between the outer periphery of the recess and the outer periphery of the boss. Formed to extend to a diameter position equal to or less than the diameter, The point of intersection with the intermediate diameter on the falling side wall surface of the deepest part of the shape that suddenly deepens from the shallow gradient with respect to the impeller rotation direction in diameter is 0 °, and 90 ° upstream of the impeller rotation direction. The downstream end portion of the reaction force generation plate is located in the following range.

  Furthermore, in the water pump impeller according to any one of claims 1 to 13 of the present invention, the invention according to claim 14 of the present invention is the reaction force generation plate or the shielding plate. Alternatively, both are integrally formed with a balance weight for adjusting a static or dynamic mechanical balance in the air of the impeller.

  Further, in the water pump impeller according to any one of claims 1 to 14 of the present invention, the invention according to claim 15 of the present invention uses a sealing material at the joint between the main plate and the lid. The sealing configuration.

  According to the impeller for a water pump according to the first aspect of the present invention, as shown in FIGS. 1 to 4, the passage of a foreign substance that is built in a pump casing attached to the lower end of the submersible motor and rotates about the submersible motor shaft. In an impeller for a water pump having a single blade or a single flow path with an emphasis on performance, when the impeller rotates in water, the fluid reaction force against the flow discharged from the impeller is radially inward. And a boss portion is provided at the central portion of the concave portion formed in the main plate of the impeller and is provided with a boss portion to be attached to the leading end portion of the submerged motor shaft. The lid is provided with a communication path that communicates the inside and outside of the recess for introducing water, and in the air, a drain hole for discharging water in the recess is formed in the lid. As the impeller rotates in water Reaction force generation that receives either a radially outward or inward reaction force by diverting the water moving in the circumferential direction in the concave direction to either the radially inward or outward direction A plate is provided in the recess, and when the impeller rotates in water, the reaction force generated by the reaction force generating plate causes water introduced into the recess to have a volume that is not uniform with the fluid reaction force. Since the resultant force with the centrifugal force acting non-uniformly is reduced or offset, it is discharged from the water outflow portion opened at one location on the outer periphery of the impeller, so that the discharge reaction In addition to the fluid reaction force acting in the centripetal direction of the impeller, there are portions with different volumes of the shallow shape and the deep shape in the recesses in the axially symmetric positions, so that the impeller turns. As a result, water in the non-uniform volume in the recess is not suitable. Reaction force generated in a recess of an impeller covered with a lid, by the hydraulic synergistic action of a single centrifugal force and the fluid reaction force, to generate a hydraulic imbalance between the fluid reaction force and the centrifugal force. Vibration is suppressed by reducing or canceling out by the hydraulic reaction force of the plate, and both the mechanical balance in the air due to the attachment of the balance weight and the hydraulic imbalance that occurs in underwater operation In addition, since the rear and front auxiliary blades corresponding to the reaction force generating plate of the present invention are not projected and exposed outside the impeller as in Patent Document 1, the auxiliary blades are accommodated. Since there is no need to provide unnecessary space for the upper and lower parts of the impeller, the dimensions in the submersible motor axial direction can be reduced. In addition, there is no increase in shaft power associated with the rotation of the impeller in water, so there is no reduction in pump efficiency, and there is no clogging of the reaction force generating plate due to foreign matter mixed in the sewage. It has the advantage that troubles due to entanglement are less likely to occur.

  According to the water pump impeller according to the invention of claim 2 based on claim 1 of the present invention, as shown in FIG. 5, two or more reaction force generating plates are provided in the recess, and the impeller When rotating in water, the reaction force generated by at least one of the reaction force generation plates reduces or cancels the fluid reaction force, and the reaction force generation plate generates at least one of the reaction force generation plates. The centrifugal force acting non-uniformly on the water introduced into the recess of the non-uniform volume by the reaction force is configured to be reduced or offset, so that each of the fluid reaction force and the centrifugal force is Since each optimum reaction force corresponding to the hydraulic imbalance is obtained, the vibration suppressing effect is extremely large.

  According to the impeller for a water pump according to claim 3 based on claim 1 or 2 of the present invention and the invention of claim 4 based on any one of claims 1 to 3 of the present invention, FIG. As shown in FIG. 7, the reaction force generation plate is provided on the deeper side of the recess in the recess where the shallow portion and the deep portion where the reaction force generation plate can be provided exist in the axially symmetric position. And the reaction force generating plate is formed so as to oppose the center height position of the water outflow portion opened in the peripheral surface of the impeller that receives the fluid reaction force. Thus, paragraph 0025 “..., Using the explanatory diagram showing the positional relationship between the bearing Br and the position where the impeller in FIG. 28 receives the fluid reaction force Fk and the reaction force Fh, the distance A from the bearing Br“ fulcrum ” The fluid reaction force Fk acting on the “action point” separated by When the distance from the “fulcrum” to the “power point” is the same as the distance A, Fk = Fa, and when the distance is shorter than the distance A, Fk <Fa. On the contrary, when it is longer than the distance A, since Fk> Fa, as shown in FIG. 7, the center position of the water outflow portion of the impeller on which the fluid reaction force Fk acts is the installation position in the submerged motor shaft lead-out direction. The closer to the position, the smaller the reaction force Fh corresponding to the reaction force Fa necessary for canceling out the fluid reaction force Fk and the centrifugal force Fc acting on the water introduced into the recess. As described, the reaction force Fh corresponding to the drag Fa is applied to a distance equal to or exceeding the distance from the “fulcrum” to the “action point” of the fluid reaction force Fk and the centrifugal force Fc. Because the force Fh can be reduced It is possible to configure a small lightweight reaction force generating plate itself has the effect that can be applied to a small impeller of the impeller outer diameter that can not secure a large radial recess width.

  According to the impeller for a water pump according to the invention of claim 5 based on any one of claims 1 to 4 of the present invention, as shown in FIG. The flow direction length of the direction change side wall which is the side that changes the water moving in the circumferential direction in the concave portion in accordance with the rotation of the impeller in water either inward or outward in the radial direction. The rear side wall on the opposite side is formed so as to have a longer blade cross-sectional shape, so that the paragraph 0026 “·· from the upstream end of the reaction force generating plate in the impeller rotation direction The flow rate of the back side wall becomes faster than the direction side wall due to the difference in the path of the water flowing to the downstream end, so the pressure on the back side wall decreases and a pressure difference occurs between the both side walls of the reaction force generating plate. The number of the term in JIS B 0131 which is a component force perpendicular to the direction of the geometric mean velocity of velocity and outflow velocity Since the “lifting force” defined in 162 is generated, the reaction force generated by the reaction force generating plate can be increased by the amount of the “lifting force”. As in the inventions of Items 3 and 4, since the reaction force generating plate can be made small, it has an effect that it can be applied to an impeller with a small outer diameter of the impeller that cannot secure a large recess width in the radial direction. Yes.

  According to the impeller for water pumps of the invention of claim 6 based on any one of claims 1 to 5 of the present invention, as shown in FIG. The mounting angle of the entire side wall of the turning side, which is the side that turns the water that moves in the circumferential direction in the concave portion in accordance with the rotation of the turning direction, either inward or outward in the radial direction, It is configured to be formed with an inclination of 45 ° with respect to the flow of water moving in the circumferential direction in the concave portion as it rotates in water. Thus, when the mounting angle θ of the reaction force generating plate with respect to the flow of water moving in the circumferential direction in the recess is 0 ° and 90 ° (shielding), no radial reaction force Fh is generated and the mounting Since the maximum value is obtained when the angle θ is 45 °, a circle is formed in the recess as the impeller rotates in water. If the mounting angle θ is formed with an inclination of 45 ° with respect to the water moving in the direction, the reaction force generating plate can be formed to the minimum necessary size. Since the reaction force generating plate can be made small in the same manner as in the inventions of claims 3 to 5 of 0050 and 0050, it can be applied to an impeller with a small outer diameter of the impeller that cannot secure a large radial recess width. have.

  According to the impeller for a water pump according to the invention of claim 7 based on any one of claims 1 to 6 of the present invention, the impeller of the reaction force generating plate as shown in FIGS. 10 to 12. The upstream end portion in the rotational direction is configured to be inclined toward the downstream side in the impeller rotational direction from the mounting surface on the bottom surface of the recess or the back surface of the lid of the reaction force generation plate toward the counter mounting surface. Thus, the soft foreign matter contained in the water is prevented from being entangled with the reaction force generating plate due to the flushing action of the water that moves in the circumferential direction in the recess as the impeller rotates in the water. As a result, there is no failure due to entanglement or blockage of foreign matter, and there is an effect that vibration reduction can be stably maintained.

  According to the impeller for a water pump according to the invention of claim 8 based on any one of claims 1 to 7 of the present invention, as shown in FIGS. 13 and 14, the impeller can be rotated in water. Accordingly, the water moving in the circumferential direction in the recess is redirected inward in the radial direction, whereby the reaction force generating plate receiving the reaction force in the radial direction is upstream in the impeller rotation direction. The end portion is connected to the outer peripheral wall of the concave portion, or the water that moves in the circumferential direction in the concave portion with the rotation of the impeller in water is diverted outward in the radial direction, The upstream end portion of the reaction force generating plate that receives an inward reaction force in the radial direction is connected to the outer wall of the boss portion so that the soft force contained in water The convex portion where the foreign matter tends to get entangled and the gap where the soft foreign matter tends to be clogged are Since it can be eliminated from the upstream end of the generating plate in the rotational direction of the impeller, it is possible to suppress the entanglement and clogging of the soft foreign matter to the reaction force generating plate, and to move the inside of the recess in the circumferential direction. Since water that moves to the reaction force generating plate can be efficiently and smoothly guided to the reaction force generation plate, a large reaction force can be generated without waste, so the reaction force generation plate can be made smaller. In addition to the effect that the vibration can be stably reduced without failure due to the entanglement or blockage of the foreign matter according to claim 7 of the paragraph 0052, the reaction of the invention according to claims 3 to 6 of the paragraphs 0049 to 0051 described above. Since the force generating plate can be made small, it has an effect that it can be applied to an impeller with a small outer diameter of the impeller that cannot secure a large concave portion width in the radial direction.

  According to the impeller for a water pump according to the ninth aspect of the present invention based on the first to seventh aspects of the present invention, as shown in FIGS. 15 and 16, the reaction force generating plate is placed in the water of the impeller. A reaction force generating plate that receives an outward reaction force in the radial direction by diverting the water moving in the circumferential direction in the concave portion in accordance with the rotation of Each of the reaction plates is divided into two reaction force generating plates that receive a reaction force in the radial direction by turning the water that moves in the circumferential direction in the recesses in the radial direction with the rotation of Since the force generating plate is provided at a position of 180 ° with respect to the submersible motor shaft, the reaction force in the same direction can be generated even if the reaction force generating plate is divided into two axially symmetrically. Therefore, even if the outer diameter of the recess is small, the reaction force of the required size is generated. Since the reaction force generation plate can be provided on the impeller, the reaction force generation plate can be installed also on the impeller having a smaller outer diameter, and the reaction force generation plate after being divided into two parts By forming the same size as before the division, it is possible to cancel out the larger fluid reaction force and the centrifugal force acting on the water introduced into the recess. According to claims 3 to 6 and 8 of the inventions of 0054, the reaction force generating plate can be made small, so that it can be applied to an impeller with a small outer diameter of the impeller that cannot secure a large radial recess width. In addition, a screw-type impeller of a “screw impeller centrifugal pump” as defined in FIG. It has the advantage that it can cope with.

  According to the impeller for a water pump according to the invention of claim 10 based on any one of claims 1 to 8 of the present invention, as shown in FIG. A reaction force generating plate that receives an outward reaction force in the radial direction by diverting water moving in the circumferential direction in the concave portion in the radial direction along with the rotation of Each of the reaction force generating plates that receive the reaction force in the radial direction is divided into two by changing the water moving in the circumferential direction in the recesses in the radial direction along with the rotation of By arranging the reaction force generating plate at 180 ° with respect to the submersible motor shaft so as to have different radial distances, the same effect as that of the ninth invention of the above paragraph 0054 can be obtained.

  According to an impeller for a water pump according to an eleventh aspect of the present invention based on any one of the first to tenth aspects of the present invention, as shown in FIGS. Or, it can be removed and replaced on the lid or both, so that it can be replaced with the reaction force generating plate with the optimum shape and installation position according to the actual operation discharge amount at the site where the pump is actually installed. Since the impeller can be equipped, the amount of fluid reaction force killed by the reaction force generating plate is increased and can be substantially canceled out, so that vibration can be further reduced. .

  According to the water pump impeller of the twelfth aspect of the present invention based on any one of the first to eleventh aspects of the present invention, as shown in FIGS. After the depth of the concave portion continuously decreases toward the downstream in the vehicle rotation direction, the shape has a shape that becomes sharply deeper than the shallow gradient, and the rotation of the impeller in water A shielding plate that suppresses the momentum of the water moving in the circumferential direction in the concave portion is protruded from the outer peripheral wall of the concave portion toward the center of the underwater motor shaft, and the inner peripheral side end portion thereof The upstream side wall of the shielding plate in the rotational direction of the impeller is formed so as to extend to a position equal to or less than the intermediate diameter between the outer circumferences of the boss portions, and the intermediate diameter with respect to the flow of water moving in the circumferential direction in the recess. Suddenly deeper from the shallower gradient with respect to the direction of rotation of the impeller The point of intersection with the intermediate diameter on the falling side wall surface of the deepest part of the shape is 0 °, and the upstream side wall of the shielding plate is located in the range of 90 ° or less upstream in the impeller rotation direction. Thus, in the respective paragraphs, the shielding plates are provided at the circumferential positions such as the position A, the position B, the position C and the position D as shown in FIG. When the vibration value is measured, the circumferential position where the shielding plate is provided is as follows. As shown in FIGS. 29 and 30, the outer peripheral diameter φDo of the recess on the falling side wall surface 4o of the deepest shape and the outside of the boss portion This is installed every 90 ° with respect to the intersection 4m position A with the intermediate diameter φDm between the diameters φDb, and the water that moves in the circumferential direction collides with the rotation of the impeller in water as the impeller rotates in the water. The upstream side wall of the shielding plate in the direction of rotation of the impeller is an extra reaction. As a result of measuring the vibration value at each position while being formed at each position substantially perpendicular to the water moving in the circumferential direction in the recess so as not to occur, position A <position D <position B <position Since it has been found that the vibration value decreases in the order of C, the flow of water is expanded from the wedge shape at the portion where the vibration value suddenly deepens as shown in paragraph 0013 and FIG. In addition to that, the flow is separated from the falling side wall surface of the enlarged concave portion to suppress a synergistic low pressure action that generates a low pressure in the concave portion. It is preferable to install the shielding plate and the reaction force generation plate as shown in FIG. 23, and the vibration value is higher when the shielding plate is provided than when only the reaction force generation plate is installed. Reduced vibration reduction of reaction force generation plate and shielding plate As the description of `` the effect of the effect synergistically ... '', after the depth of the concave portion is continuously reduced toward the downstream in the rotation direction of the impeller, the shape has a shape that becomes deeper from the decreasing gradient. For example, even in an impeller for a bladeless pump, the generation of the axial thrust can be efficiently suppressed and vibrations can be effectively reduced, and the effect of the reaction force generation plate can be made to act synergistically. The vibration can be extremely reduced.

  According to the impeller for a water pump according to the invention of claim 13 based on any one of claims 1 to 4 and 6 and 10 of the present invention, as shown in FIG. After the depth of the concave portion is continuously reduced toward the downstream in the direction, the concave portion has a shape that becomes sharply deeper than the shallow gradient, and the inside of the concave portion is rotated as the impeller rotates in water. The centrifugal force acting on the fluid reaction force or the water introduced into the recess by receiving the reaction force in the radial direction by turning the water moving in the circumferential direction inward in the radial direction An upstream end of the reaction force generating plate configured to reduce or cancel either one or both of the two is connected to the recess outer peripheral wall, and a downstream end thereof is connected to the outer periphery of the recess. Extends to a position that is less than or equal to the intermediate diameter between the boss outer circumferences In the intermediate diameter, the intersection position with the intermediate diameter on the falling side wall surface of the deepest part of the shape that sharply deepens from the shallow gradient with respect to the impeller rotation direction is 0 °, and the upstream of the impeller rotation direction By forming the downstream end portion of the reaction force generating plate in a range of 90 ° or less on the side, the same effect as that of the invention of claim 12 of the paragraph 0057 is achieved.

  According to the water pump impeller of the fourteenth aspect of the present invention based on any one of the first to thirteenth aspects of the present invention, as shown in FIG. 25, either the reaction force generating plate or the shielding plate. One or both of them are formed integrally with a balance weight for adjusting a static or dynamic mechanical balance in the air of the impeller as described in paragraph 0030 above. Can be formed in a simple and compact manner, so that the clogging and entanglement of foreign matters can be further suppressed, and the impeller can be reduced in weight and manufactured easily.

  According to the water pump impeller of the invention of claim 15 based on any one of claims 1 to 14 of the present invention, the joint between the main plate and the lid is sealed as shown in FIG. Since the recess is filled with water, once the inside of the recess is filled with water, water cannot enter any more, so there is no failure due to foreign matters such as foreign matter accumulation in the recess. It has the effect that vibration prevention can be maintained extremely stably.

It is the vertical side view which showed the structure of the submersible motor pump provided with the impeller for water pumps of Examples 1 to 15 of the present invention. It is a cross-sectional arrow line view which shows the impeller for water pumps of Example 1 thru | or 15 of this invention in the S1-S1 line | wire of FIG. It is a top view which shows the state which removed the cover of the impeller for water pumps of the aspect which provided the reaction force generation board in the recessed part of Example 1 of this invention in FIG. FIG. 5 is a cross-sectional view taken along the line S2-S2 of FIG. It is a top view which shows the state which removed the cover of the impeller for water pumps of the aspect which provided the division | segmentation reaction force generation | occurrence | production board in the recessed part of Example 2 of this invention in FIG. It is a top view which shows the state which removed the cover of the impeller for water pumps of the aspect which provided the reaction force generation | occurrence | production board in the side where the depth of the recessed part of Example 3 of this invention in FIG. 2 is deeper. The water pump impeller cover in the aspect in which the reaction force generation plate is provided so as to oppose the center height position of the water outflow portion of the impeller according to the fourth embodiment of the present invention in the S3-S3 line of FIG. It is the attached cross-sectional arrow view. It is a top view which shows the state which removed the cover of the impeller for water pumps which formed the reaction force generation board of Example 5 of this invention in FIG. 2 in the blade cross-sectional shape. In FIG. 2, the cover of the impeller for water pump, in which the mounting angle of the entire side wall on the direction of change side of the reaction force generation plate of Example 6 of the present invention is inclined at 45 ° with respect to the flow of water, is removed. It is a top view which shows a state. The top view which shows the state which removed the cover of the impeller for water pumps of the aspect which inclined the upstream edge part of the impeller rotation direction of the reaction force generation board of Example 7 of this invention in FIG. 2 to the downstream. It is. It is the principal part cross-sectional arrow view of the impeller for water pumps of the aspect which made the reaction force generation board of Example 7 of this invention stand in the recessed part bottom surface in the S4-S4 line of FIG. It is the principal part cross-sectional arrow view of the impeller for water pumps of the aspect which made the reaction force generation board of Example 7 of this invention suspended from the cover back surface in the S4-S4 line | wire of FIG. The plane which shows the state which removed the lid | cover of the impeller for water pumps of the aspect which connected the upstream edge part of the impeller rotation direction of the reaction force generation plate of Example 8 of this invention to the recessed part outer peripheral wall in FIG. FIG. In FIG. 2, the lid of the water pump impeller in a mode in which the upstream end of the reaction force generating plate of the eighth embodiment of the present invention in the rotating direction of the impeller is connected to the outer wall of the boss is removed. It is a top view which shows the state. The plane which shows the state which removed the cover of the impeller for water pumps of the aspect which provided each reaction force generation | occurrence | production plate divided into 2 of Example 9 of this invention in the position of 180 degrees with respect to the submersible motor shaft in FIG. FIG. In FIG. 2, the lid of the impeller for a water pump in which the split reaction force generating plate of the second embodiment of the ninth embodiment of the present invention is further divided into 180 ° positions with respect to the submersible motor shaft. It is a top view which shows the state removed. In FIG. 2, the lid of the water pump impeller according to the embodiment in which the two reaction force generation plates of the tenth embodiment of the present invention are provided at 180 ° with respect to the submersible motor shaft so as to have different radial distances. It is a top view which shows the state which removed. It is a top view which shows the state which removed the cover of the impeller for water pumps of the aspect which removed and provided the reaction force generation board of Example 11 of this invention in FIG. It is the cross-sectional arrow view of the impeller for water pumps of the aspect which made the reaction force generation board of Example 11 of this invention standing at the recessed part bottom surface in the S5-S5 line | wire of FIG. It is the cross-sectional arrow view of the impeller for water pumps of the aspect which suspended the reaction force generation | occurrence | production board of the other example of Example 11 of this invention in the back surface of the lid | cover in the S5-S5 line | wire of FIG. FIG. 6 is a cross-sectional arrow view illustrating a state in which the concave portion of the water pump impeller of the present invention continuously decreases in depth toward the downstream in the impeller rotation direction in the S6-S6 line of FIG. 2. 2 is a cross-sectional view illustrating a state in which the concave portion of the water pump impeller according to the present invention suddenly becomes deeper from the gradient in which the depth of the concave portion continuously decreases toward the downstream side in the impeller rotating direction in the line S7-S7 in FIG. It is explanatory drawing for demonstrating the attachment range of a shielding board with the arrow view and the top view of the state which removed the cover. It is a top view which shows the state which removed the cover of the impeller for water pumps of the aspect which provided the shielding board and reaction force generation | occurrence | production board of Example 12 of this invention in FIG. It is a top view which shows the state which removed the cover of the impeller for water pumps which provided the reaction force generation board which comprised the function of the shielding board of Example 13 of this invention in FIG. It is a top view which shows the state which removed the lid | cover of the impeller for water pumps of the aspect which formed both the reaction force generation board and shielding board of Example 14 of this invention in FIG. 2 with the balance weight. It is explanatory drawing which shows the state which receives the reaction force of a radial inward by the reaction force generation | occurrence | production board of this invention turning the water which moves the inside of this recessed part in the circumferential direction to a radial outward. It is explanatory drawing which shows the state which receives the reaction force of a radial outward by the reaction force generation | occurrence | production board of this invention turning the water which moves the inside of this recessed part in the circumferential direction in the radial direction. It is explanatory drawing which shows the positional relationship of the position and the bearing which the impeller receives the fluid reaction force and reaction force in patent document 1 which is a prior art. It is explanatory drawing for demonstrating verification of the shielding board of this invention. It is the cross-sectional arrow figure which showed the relationship between the shielding board of this invention, and a recessed part shape in the S8-S8 line | wire of FIG. It is explanatory drawing which shows the relationship between the attachment angle of the reaction force generation board of this invention, and the reaction force to generate | occur | produce.

  Hereinafter, in the impeller for a water pump having a single blade or one flow passage, which is built in a pump casing attached to the lower end of the submersible motor of the present invention and places importance on the passage of foreign matters rotating around the submersible motor shaft. When the impeller rotates in water, it receives a fluid reaction force against the flow discharged from the impeller inward in the radial direction, and a submersible motor is provided in the central portion of the recess formed in the main plate of the impeller. A boss portion is provided to be attached to the leading end portion of the shaft, and a lid that covers the concave portion is provided, and a communication path that communicates the inside and outside of the concave portion for introducing water into the concave portion in water is provided in the lid. In addition, in the air, a drain hole for discharging water in the recess is formed in the lid, and the inside of the recess moves in the circumferential direction as the impeller rotates in water. Water inward or outward in the radial direction When the impeller rotates in water, a reaction force generating plate that receives a reaction force in either the outward or inward direction in the radial direction by being changed to one of the two is provided in the recess. As an embodiment configured to reduce or cancel the resultant force of the fluid reaction force and the centrifugal force acting on the water introduced into the recess by the reaction force generated by the reaction force generation plate, As described above, the present invention will be described in detail with reference to the drawings, but the present invention is not limited to the embodiments.

  1 to 4, reference numeral 1 denotes a motor portion of the submersible motor pump, and 2 denotes a submersible motor 1 which is guided from the submersible motor 1 and passes through the oil chamber 3 while being fitted with a mechanical seal, and is led into a pump casing 7 of the submersible motor pump. A submerged motor shaft that has a single blade or one attached to the leading end of the submersible motor shaft 2 guided into the pump casing 7 with emphasis on the passage of foreign matter that rotates around the submersible motor shaft 2. A boss 4e provided at the central portion of the recess 4b formed in the main plate 4a of the water pump impeller 4 having one flow path is mounted, and a lid 5 covering the recess 4b is provided on the outer peripheral edge of the recess 4b. An annular groove 4g for mounting is provided, and a hole 5a larger than the boss outer wall 4h is formed in the central portion of the lid 5, and the hole 5a is formed larger than the boss outer wall 4h, thereby forming the recess 4b. Water is introduced inside The communication passage 6 that is an annular gap for forming the communication passage 6 is formed, and preferably the communication passage 6 is formed eccentrically with respect to the rotation center of the submersible motor shaft 2 to actively introduce water into the recess 4b. By forming the axial depth of the annular groove 4g so that the upper end surface 5c of the lid is substantially the same as the upper end surface 4d of the main plate, water can flow into the communication passage 6 more smoothly, The lid 5 is fixed by an annular groove 4g and a plurality of lid fasteners 12. If a pan head screw is used for the lid fastener 12, the head is hemispherical, so that long foreign objects may be entangled with the lid fastener 12. A drain hole 5b is formed on the downstream side of the lid fastener 12 with respect to the direction of rotation of the impeller 4 in order to discharge water in the recess 4b during air operation. 4 is the fluid reaction force Fk against the flow discharged from the impeller 4 when rotating in water. At the central height position 4k of the water outflow portion opened on the peripheral surface of the impeller 4 and received inward in the radial direction, and the recess 4b is rotated in the circumferential direction as the impeller 4 rotates in water. The reaction force generating plate 9 that receives the reaction force Fh in either the outward or inward direction in the radial direction by changing the water moving in the inward or outward direction in the radial direction is As shown in FIG. 3, when the impeller 4 rotates in water, the fluid reaction force Fk and the non-uniform volume of the fluid reaction force Fk are generated by the reaction force Fh generated by the reaction force generation plate 9. The resultant force Fg with the centrifugal force Fc acting non-uniformly on the water introduced into the recess 4b is reduced or offset.

  For example, referring to FIG. 5, based on the first embodiment, two or more reaction force generation plates 9 are provided in the recess 4b, and when the impeller 4 rotates in water, the reaction force is increased. The fluid reaction force Fk is reduced or offset by the reaction force Fh generated by at least one of the generation plates 9 and is non-uniform by the reaction force Fh generated by at least one other of the reaction force generation plates 9. The centrifugal force Fc acting non-uniformly on the water introduced into the concave portion 4b having a large volume is configured to be reduced or offset.

  Based on the first or second embodiment, for example, with reference to FIG. 6, in the concave portion 4b in which the shallow portion and the deep portion where the reaction force generation plate 9 can be provided exist in the axially symmetric position, The reaction force generating plate 9 is configured to be provided on the deeper side of the recess 4b.

  Based on any one of the first to third embodiments, for example, with reference to FIG. 7, the central height of the water outflow portion that is opened on the peripheral surface of the impeller 4 that receives the fluid reaction force Fh. The reaction force generation plate 9 is formed so as to oppose the position 4k.

  Based on any of the first to fourth embodiments, for example, using FIG. 8, the fluid reaction force Fk, the centrifugal force Fc, and the resultant force Fg shown in FIG. The horizontal cross-sectional shape of the reaction force generating plate 9 is such that the water moving in the circumferential direction in the concave portion 4b with the rotation of the impeller 4 in the water is radially inward or outward. The back side wall 9b opposite to the flow direction length of the direction change side wall 9a, which is the direction to be changed to one of the sides, is formed in a longer blade cross-sectional shape, so that lift force is added to the reaction force Fh. Is configured to generate

  Based on any one of the first to fifth embodiments, for example, using FIG. 9, the fluid reaction force Fk, the centrifugal force Fc, and the resultant force Fg shown in FIG. As the reaction force generating plate 9 rotates in the water of the impeller 4 in the water, the water that moves in the circumferential direction in the concave portion 4b is changed either inward or outward in the radial direction. The mounting angle θ of the entire direction side wall 9a, which is the direction to be directed, is inclined by 45 ° with respect to the flow of water moving in the circumferential direction in the recess 4b as the impeller 4 rotates in water. Thus, the reaction force generation plate 9 is configured to a minimum size.

  Based on any one of the first to sixth embodiments, for example, referring to FIGS. 10 to 12, the fluid reaction force Fk, the centrifugal force Fc, and the resultant force Fg shown in FIG. The upstream end portion 9c of the reaction force generating plate 9 in the rotational direction of the impeller 4 acts on the wheel 4 from the mounting surface 9e on the bottom surface of the recess 4b or the back surface of the lid 5 to the counter mounting surface 9f. As the impeller 4 is inclined toward the downstream side in the direction of rotation of the impeller 4, the swirling action caused by the water force of the water moving in the circumferential direction in the recess 4 b as the impeller 4 rotates in water. Therefore, it is desirable that the soft foreign matter contained in the water is configured to have a gentle inclination so that the reaction force generation plate 9 is not entangled.

  Based on the first to seventh embodiments, for example, with reference to FIGS. 13 and 14, the fluid reaction force Fk, the centrifugal force Fc and the resultant force Fg shown in FIG. When the impeller 4 rotates in water, the water that moves in the circumferential direction in the concave portion 4b is diverted inward in the radial direction, so that the outward reaction force Fh in the radial direction is increased. An upstream end portion 9c of the reaction force generating plate 9 to be received in the rotational direction of the impeller 4 is connected to the outer peripheral wall 4i of the concave portion, or inside the concave portion 4b as the impeller 4 rotates in water. Of the reaction force generating plate 9 receiving the reaction force Fh in the radial direction by changing the water moving in the circumferential direction outward in the radial direction. 9c is connected to the outer wall 4h of the boss part, The upstream end 9c is smoothly connected to the recess outer peripheral wall 4i or the boss outer wall 4h so that water moving in the circumferential direction can be efficiently and smoothly guided to the reaction force generating plate 9. Configure.

  Based on one of the first to seventh embodiments, for example, with reference to FIGS. 15 and 16, the fluid reaction force Fk, the centrifugal force Fc, and the resultant force Fg shown in FIG. By acting on the wheel 4 and turning the reaction force generating plate 9 inward in the radial direction, the water moving in the circumferential direction in the recess 4b as the impeller 4 rotates in water. A reaction force generating plate 9 that receives an outward reaction force Fh in the radial direction, and the water that moves in the circumferential direction in the recess 4b as the impeller 4 rotates in water is changed outward in the radial direction. Each reaction force generation plate 9 is divided into two by a reaction force generation plate 9 that receives an inward reaction force Fh in the radial direction by being oriented, and is provided at a position of 180 ° with respect to the underwater motor shaft 2. Reduce reaction force generating plate 9 or generate large reaction force Fh It is configured so that.

  Based on any one of the first to eighth embodiments, for example, using FIG. 17, the fluid reaction force Fk, the centrifugal force Fc, and the resultant force Fg shown in FIG. And the reaction force generating plate 9 is changed in the radial direction by turning the water moving in the circumferential direction in the recess 4b in the radial direction as the impeller 4 rotates in the water. The reaction force generation plate 9 that receives the outward reaction force Fh of water and the water that moves in the circumferential direction in the concave portion 4b in response to the rotation of the impeller 4 in water are changed outward in the radial direction. Accordingly, the reaction force generation plates 9 that receive the inward reaction force Fh in the radial direction are divided into two, and each reaction force generation plate 9 is distributed 180 degrees with respect to the submersible motor shaft 2 and provided with different radial distances. As a result, the reaction force generation plate 9 can be made smaller or larger. It configured to generate a use force Fh.

  Based on any of the first to tenth embodiments, for example, with reference to FIGS. 18 to 20, the fluid reaction force Fk, the centrifugal force Fc, and the resultant force Fg shown in FIG. Since the reaction force generating plate 9 acts on the wheel 4 and can be removed and replaced with the impeller 4 or the lid 5 or both, it can match the actual operation discharge amount at the site where the pump is actually installed. The reaction force generation plate 9 can be easily replaced with the reaction force generation plate 9 having an optimum shape and installation position, and the reaction force generation plate 9 can be fastened to the impeller 4 and / or the lid 5 with a plurality of fastenings. If it is fixed by the tool 13 and preferably a pan head screw is used for the fastener 13, the flow of water to the reaction force generating plate 9 is not disturbed, and the head is hemispherical. It can also prevent tangling of long foreign objects Configured to.

  For example, referring to FIG. 23, the fluid reaction force Fk, the centrifugal force Fc, and the resultant force Fg shown in FIG. The concave portion 4b has a shape in which the depth of the concave portion 4b becomes shallow gradually after the depth of the concave portion 4b is continuously reduced toward the downstream in the rotation direction of the impeller 4 and the blade 4 A shielding plate 10 that suppresses the momentum of water that moves in the circumferential direction in the concave portion 4b as the vehicle 4 rotates in water is projected from the outer peripheral wall 4i toward the center of the underwater motor shaft 2. In addition, the inner peripheral side end 10a is formed to extend to a position where the intermediate diameter φDm between the outer periphery of the recess 4b and the outer periphery of the boss portion 4e is less than or equal to, and more specifically, the intermediate diameter φDm is (recess outer periphery diameter φDo + boss portion) Outer diameter φDb) ÷ 2 The upstream side wall 10b of the plate 10 in the rotation direction of the impeller 4 is formed at right angles to the flow of water moving in the circumferential direction in the recess 4b, and at the intermediate diameter φDm with respect to the rotation direction of the impeller 4 The position of the intersection 4m with the intermediate diameter φDm on the falling side wall surface 4o of the deepest shape that suddenly deepens from the shallow slope is 0 °, and the shielding is in the range of 90 ° or less on the upstream side in the rotation direction of the impeller 4. By forming the upstream side wall 10b of the plate 10 so as to be positioned, the depth of the concave portion 4b continuously decreases toward the downstream in the rotation direction of the impeller 4 and then rapidly decreases from the decreasing gradient. Also in the impeller 4 for the water pump having a deeper shape, the generation of the axial thrust can be efficiently suppressed and vibration can be effectively reduced, and the effect of the reaction force generating plate 9 can be synergistically operated. And preferably By forming the upper end surface 10c of the shield plate 10 to the annular groove 4g bottom, it can be further increased more the effect.

  For example, referring to FIG. 24 based on any one of Examples 1 to 4 and 6 and 10, the fluid reaction force Fk, the centrifugal force Fc, and the resultant force Fg shown in FIG. The shape which acts on the impeller 4 and the concave portion 4b becomes deeper than the gradient which becomes shallower after the depth of the concave portion 4b becomes continuously shallow toward the downstream in the rotation direction of the impeller 4. And the outward reaction force Fh in the radial direction is changed by turning the water moving in the circumferential direction in the concave portion 4b inward in the radial direction as the impeller 4 rotates in water. Upon receiving, the fluid reaction force Fk or the centrifugal force Fc acting on the water introduced into the recess 4b, either one or both of the upstream of the reaction force generation plate 9 configured to attenuate or cancel The side end portion 9c is formed on the concave outer peripheral wall 4i. The downstream end 9d is formed to extend to a position where the intermediate diameter φDm between the outer periphery of the recess 4b and the outer periphery of the boss 4e is equal to or smaller than the outer diameter 9d. The outer diameter φDb) ÷ 2, and the intersection with the intermediate diameter φDm at the falling side wall surface 4o of the deepest part of the shape that suddenly deepens from the shallow gradient with respect to the rotation direction of the impeller 4 at the intermediate diameter φDm The 4m position is set to 0 °, and the downstream end portion 9d of the reaction force generating plate 9 is formed so as to be positioned in a range of 90 ° or less on the upstream side in the rotation direction of the impeller 4.

  Based on any one of the first to thirteenth embodiments, for example, using FIG. 25, the fluid reaction force Fk, the centrifugal force Fc, and the resultant force Fg shown in FIG. One or both of the reaction force generation plate 9 and the shielding plate 10 is integrated with a balance weight Wb for adjusting a static or dynamic mechanical balance in the air of the impeller 4. Since the concave portion 4b can be formed in a simple and compact manner, the clogging and entanglement of foreign matters can be further suppressed, and the impeller 4 can be reduced in weight and manufactured easily.

  Based on any one of Examples 1 to 14, for example, with reference to FIG. 1, the joint between the annular groove 4 g and the lid 5 is sealed using a sealing material 11. Once the concave portion 4b is filled with water, no further water can enter, so that the failure due to foreign matters such as foreign matter accumulation in the concave portion 4b is eliminated, and the vibration prevention is maintained extremely stably. ing.

DESCRIPTION OF SYMBOLS 1 Submersible motor 2 Submersible motor shaft 3 Oil chamber 4 Impeller 4a Main plate 4b Concave 4c Main plate outer wall 4d Main plate upper end surface 4e Boss part 4g Annular groove 4h Boss part outer wall 4i Concave outer peripheral wall 4k Center height position of water outflow part 4l Impeller suction port 4m Intersection with φDm on the falling side wall surface of the deepest shape that suddenly deepens from the shallow slope of the recess 4o Dropping side wall surface 5 Lid 5a hole 5b Drain hole 5c Upper end surface of the lid 6 Communication path 7 Pump Casing 7a Pumping channel 7b Shaft-shaped part 7c Inner side wall 7d Upper end surface 8 Space 9 Reaction force generating plate 9a Turning side wall 9b Back side side wall 9c Upstream side end 9d Downstream side end 9e Mounting surface 9f Anti-mounting surface 10 Shielding Plate 10a Inner peripheral side end 10b Upstream side wall 10c Upper end surface 11 Sealing material 12 Lid fastener 13 Reaction force generating plate fastener Br Bearing φDb Boss outer diameter φDm Intermediate diameter φDo Concave outer diameter G1 Annular gap G2 Axial gap G3 Annular gap on the side plate G4 Axial gap on the side plate side R Circulation flow Wb Balance weight θ Mounting angle of the reaction force generating plate Fa Drag force Fc Centrifugal force Fg Combined force Fh Reaction force Fk Fluid reaction force Fu Force of circumferential component Fw Force received from water

Claims (15)

  In an impeller for a water pump, which is built in a pump casing attached to the lower end of a submersible motor and has a single blade or a single flow passage with an emphasis on the passage of foreign matter rotating around the submersible motor shaft, the impeller is When rotating in water, a fluid reaction force against the flow discharged from the impeller is received inward in the radial direction, and the guided tip of the submersible motor shaft is placed in the central portion of the recess formed in the main plate of the impeller. A boss part for attaching to the part, a cover for covering the concave part, a communication path communicating the inside and outside of the concave part for introducing water into the concave part in the water and provided in the lid, and in the air A drain hole for discharging water in the recess is formed in the lid, and the water that moves in the circumferential direction in the recess as the impeller rotates in water is supplied in the radial direction. Either inward or outward A reaction force generating plate that receives a reaction force of either outward or inward in the radial direction by turning in the direction is provided in the recess, and the reaction force is generated when the impeller rotates in water. The reaction force generated by the generating plate is configured to reduce or cancel out the resultant force of the fluid reaction force and the centrifugal force acting nonuniformly on the water introduced into the recess having a nonuniform volume. An impeller for a water pump, characterized in that   2. The water pump impeller according to claim 1, wherein two or more reaction force generation plates are provided in the recess, and the impeller rotates at least in the reaction force generation plate when rotating in water. The fluid reaction force is reduced or offset by the reaction force generated by one, and the water introduced into the recesses of non-uniform volume by the reaction force generated by at least one other of the reaction force generation plates. An impeller for a water pump, characterized in that the centrifugal force acting non-uniformly is reduced or offset.   The impeller for a water pump according to claim 1 or 2, wherein the depth of the concave portion is within the concave portion in which the shallow portion and the deep portion where the reaction force generating plate can be provided exist in an axially symmetric position. An impeller for a water pump, characterized in that the reaction force generating plate is provided on a deeper side.   4. The water pump impeller according to claim 1, wherein the water pump impeller is opposed to a central height position of a water outflow portion opened in a peripheral surface of the impeller that receives the fluid reaction force. 5. The water pump impeller is characterized in that the reaction force generating plate is formed.   5. The impeller for a water pump according to claim 1, wherein a horizontal cross-sectional shape of the reaction force generation plate is circumferential in the recess as the impeller rotates in water. The rear side wall on the opposite side has a longer blade cross-sectional shape than the flow direction length of the direction-changing side wall, which is the side that diverts water moving in the direction to either the radially inward or outward direction. An impeller for water pumps, characterized in that it is formed.   6. The water pump impeller according to claim 1, wherein the water moves in the circumferential direction in the recess as the impeller rotates in the water of the impeller in water. The mounting angle of the entire side wall of the turning side, which is the side that turns the wire inward or outward in the radial direction, moves in the circumferential direction in the recess as the impeller rotates in water. An impeller for a water pump, characterized in that the water pump is formed with an inclination of 45 ° with respect to the flow of water.   It is an impeller for water pumps as described in any one of Claims 1 thru | or 6, Comprising: The upstream edge part of this impeller rotation direction of the said reaction force generation plate is the said recessed part bottom face or lid | cover of the said reaction force generation plate. An impeller for a water pump, wherein the impeller is configured to be inclined toward the downstream side in the rotational direction of the impeller from the attachment surface on the back surface toward the non-attachment surface.   The impeller for a water pump according to any one of claims 1 to 7, wherein the water that moves in the circumferential direction in the recess as the impeller rotates in water is radially inward. Or the upstream end of the reaction force generating plate that receives an outward reaction force in the radial direction is connected to the outer peripheral wall of the recess or the impeller The impeller of the reaction force generating plate that receives an inward reaction force in the radial direction by diverting the water that moves in the circumferential direction in the concave portion in the radial direction in accordance with the rotation in water to the radial direction. An impeller for a water pump, characterized in that an upstream end in a rotational direction is connected to the outer wall of the boss part.   The impeller for a water pump according to any one of claims 1 to 7, wherein the reaction force generating plate is moved in the circumferential direction in the recess as the impeller rotates in water. A reaction force generating plate that receives an outward reaction force in the radial direction by turning water inward in the radial direction, and moves in the recess in the circumferential direction as the impeller rotates in water. Each reaction force generating plate is provided at 180 ° with respect to the submersible motor shaft. The reaction force generating plate is divided into two by receiving the reaction force in the radial direction by turning the water outward in the radial direction. An impeller for a water pump, characterized by being configured as described above.   The impeller for a water pump according to any one of claims 1 to 8, wherein the reaction force generating plate is moved in the circumferential direction in the recess as the impeller rotates in water. A reaction force generating plate that receives an outward reaction force in the radial direction by turning water inward in the radial direction, and moves in the recess in the circumferential direction as the impeller rotates in water. Each reaction force generating plate is divided into 180 ° with respect to the underwater motor shaft by dividing the water into two reaction force generating plates that receive the reaction force in the radial direction by turning the water outward in the radial direction. An impeller for a water pump, characterized in that it is configured to be provided with different radial distances.   It is the impeller for water pumps as described in any one of Claims 1 thru | or 10, Comprising: The said reaction force generation | occurrence | production board is comprised so that it can replace | exchange and remove to this impeller or the said lid | cover, or both. An impeller for a water pump.   The impeller for a water pump according to any one of claims 1 to 11, wherein the recess has a depth that is continuously reduced toward the downstream in the rotation direction of the impeller. A shielding plate that has a shape that becomes deeper and deeper than a shallow gradient, and that suppresses the momentum of water that moves in the circumferential direction in the recess as the impeller rotates in water from the outer wall of the recess. The blade of the shielding plate is formed so as to project toward the center of the submersible motor shaft, and its inner peripheral side end extends to a position equal to or less than the intermediate diameter between the outer periphery of the recess and the outer periphery of the boss. The upstream side wall in the direction of rotation of the vehicle is formed at a right angle to the flow of water moving in the circumferential direction in the recess, and becomes deeper from the shallow gradient with respect to the direction of rotation of the impeller at the intermediate diameter. The point of intersection with the intermediate diameter on the falling side wall surface of the deepest part is 0 ° And, wherein the upper stream side wall of the shielding plate on the upstream side and 90 ° or less in the range of the impeller rotation direction are formed so as to be located, the impeller for a water pump.   The impeller for a water pump according to any one of claims 1 to 4, 6 and 10, wherein the depth of the concave portion of the concave portion decreases continuously toward the downstream in the impeller rotating direction. After that, it has a shape that becomes deeper and deeper than the shallower gradient, and the water that moves in the circumferential direction in the recess as the impeller rotates in water is turned inward in the radial direction. By receiving an outward reaction force in the radial direction, the fluid reaction force or the centrifugal force acting on the water introduced into the recess is reduced or offset. The upstream end of the reaction force generating plate is connected to the outer peripheral wall of the recess, and the downstream end thereof is formed to extend to a position equal to or less than the intermediate diameter between the outer periphery of the recess and the outer periphery of the boss, The shallow diameter relative to the rotational direction of the impeller at the intermediate diameter. The downstream side of the reaction force generating plate is within a range of 90 ° or less on the upstream side in the impeller rotational direction, with the intersection position with the intermediate diameter on the falling side wall surface of the deepest part of the shape deepening rapidly from the gradient An impeller for a water pump, characterized in that the end portion is located.   The water pump impeller according to any one of claims 1 to 13, wherein either one or both of the reaction force generation plate and the shielding plate are static or dynamic in the air of the impeller. A water pump impeller characterized by being formed integrally with a balance weight for adjusting a mechanical balance.   The water pump impeller according to any one of claims 1 to 14, wherein a joint portion between the main plate and the lid is configured to be sealed using a sealing material. Pump impeller.

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