JP2010190154A - Pump and western style closet bowl using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pump feeding liquid at a high flow rate in a short time and excellent in quietness, and to provide a western style closet bowl excellent in washing function. <P>SOLUTION: The pump 10 includes: a rotational shaft 12 transmitting torque of a motor 11 as a driving source; an impeller 15 having a shroud 14 fitted into the rotational shaft 12 and having an opening 13 formed on a suction side of the liquid; and a casing 18 housing the impeller 15 and having a suction port 16 positioned in front of the opening 13 and a discharge port 17 positioned to face an outer periphery of the impeller 15. A plurality of vanes 19 constitute the impeller 15, and each vane has a widened part 20 widened from an axial center 12c of the rotational shaft 12 toward the outer periphery in the axial center 12c direction. The casing 18 opposed to the widened part 20 in the axial center 12c direction is provided with inclined wall parts 21 inclined along the widened parts 20. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a pump suitable for water supply means such as a flush toilet or a dishwasher, and a Western-style toilet using the same.

  When supplying wash water for Western-style toilets with a pump, the performance of a low head (several meters) and a large flow rate (100 L / min) is required. However, with an axial flow pump suitable for general low heads and large flow rates, Since layout is difficult in terms of size, for example, a compact centrifugal type pump is often employed. On the other hand, as prior art related to the present invention, for example, there is a bath water self-priming pump described in Patent Document 1.

Japanese Patent No. 3618077

  Of various performances required for pumps, especially when you want to increase flow performance, there is a method of increasing the number of revolutions, for example, but increasing the number of revolutions increases noise, so the number of revolutions is suppressed to reduce noise. There are situations that must be done. Therefore, in order to satisfy these conflicting demands, an impeller with higher feeding efficiency is required.

  On the other hand, as another means for obtaining a large flow rate, there is a method of increasing the impeller or increasing the impeller blade width, but if this method is adopted, the size of the entire pump increases, so the installation space Another problem arises, such as being unable to use in narrow spaces.

  As shown in FIG. 6, the conventional self-priming pump 60 described in Patent Document 1 and the like has an increase in water discharge as one of the problems to be solved, and a shroud 62 is provided on the suction port 61 side of the casing 63. And a semi-open type impeller 64 made of synthetic resin. The motor 66 side portion (rear edge portion 65a) of the blade 65 constituting the impeller 64 has a substantially flat shape when viewed from the side, and the back wall portion 63a of the casing 63 facing the rear edge portion 65a is also flat. It is composed of planes. Further, a wide gap exists between the front surface of the shroud 62 and the casing.

  The impeller 64 having the shroud 62 formed on the front surface is excellent in that the amount of water returned to the water supply side is small and the feeding efficiency is high, but the trailing edge portion 65a of the blade 65 located on the side where the shroud 62 is not provided. Since the turbulent flow 68 is likely to occur in the vicinity, the feeding efficiency may be lowered.

  The first problem to be solved by the present invention is to provide a pump that can deliver a large flow rate of liquid in a short time and is excellent in quietness. The second problem is a cleaning function. It is to provide an excellent Western-style toilet.

The pump according to the present invention includes a rotating shaft that transmits a rotational force of a driving source, an impeller that is fitted in the rotating shaft and includes a shroud that is provided with an opening on a liquid suction side, and stores the impeller and a front surface of the opening. In a pump comprising a casing having a suction port located at and a discharge port located opposite to the outer periphery of the impeller,
The blades constituting the impeller are provided with a widened portion that expands in the axial direction from the axial center of the rotating shaft toward the outer periphery, and the casing facing the widened portion and the axial direction along the widened portion. An inclined wall portion that is inclined is provided, and a portion where the blade and the casing face each other has a gap of a predetermined interval. Here, the gap at a predetermined interval between the impeller blades and the casing facing each other means an extremely small gap that does not substantially give resistance to the impeller.

  With such a configuration, there is an inclined wall portion inclined along the widened portion in the casing facing the widened portion provided on the impeller blades, so that the area near the rotating shaft on the impeller drive source side. Since the (cavity) can be eliminated, the pumping efficiency is improved. In addition, since the inclined wall portion inclined along the widened portion of the impeller can be provided, the gap between the blade and the casing can be minimized, so that resistance is maintained even in a liquid having a higher viscosity coefficient than gas. The impeller rotates in a small state. Furthermore, by making the impeller blades wider toward the outer periphery, the amount of liquid to be fed can be increased, so that the pump feeding efficiency can be increased without increasing the rotation speed of the impeller, Silence is also increased.

Here, the blade thickness at the discharge port side end of the impeller is Lo, the outer diameter of the impeller is D, and the thickness of the bell ring protruding from the opening of the shroud toward the suction port side is When L ₁
It is preferable that the range of 0 <L ₁ <30 × Lo / D and the gap between the bell ring and the casing be 0.5 to 1.5 mm.

  With such a configuration, the pump feeding efficiency can be further increased. In addition, by setting the gap between the bell ring and the casing in the range of 0.5 to 1.5 mm, it is possible to reduce the water flowing backward from the gap and to facilitate the assembly of the impeller to the casing. .

  Next, the Western-style toilet of the present invention is characterized in that the above-described pump is used as the washing water supply means.

  With such a configuration, since the pump exhibits the characteristics of a small head and a large flow rate, it is possible to obtain a Western-style toilet having excellent drainage and washing functions after stool.

  According to the present invention, it is possible to provide a pump that is capable of supplying a large flow rate of liquid in a short time, is excellent in quietness, and a Western-style toilet that is excellent in a cleaning function.

It is sectional drawing in the surface containing the rotating shaft center of the pump which is embodiment of this invention. It is a front view of the impeller which comprises the pump shown in FIG. It is the sectional view on the AA line in FIG. It is a rear view of the impeller shown in FIG. It is a schematic block diagram which shows the western style toilet bowl which is embodiment of this invention. It is sectional drawing which shows the conventional pump.

  Hereinafter, a pump according to an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the pump 10 of this embodiment includes a rotating shaft 12 that transmits the rotational force of a motor 11 that is a driving source, and a shroud that is fitted into the rotating shaft 12 and has an opening 13 on the liquid suction side. 14, and a casing 18 that houses the impeller 15 and has a suction port 16 that is located on the front surface of the opening 13 and a discharge port 17 that faces the outer periphery of the impeller 15.

  As shown in FIGS. 1 to 4, the plurality of blades 19 constituting the impeller 15 are each provided with a widened portion 20 that expands in the direction of the axial center 12 c from the axial center 12 c of the rotating shaft 12 toward the outer periphery. An inclined wall portion 21 that is inclined along the widened portion 20 is provided in the casing 18 facing the shaft 20 in the direction of the axis 12c. A short cylindrical bell ring 25 is provided in the opening 13 of the shroud 14 of the impeller 15 from the opening 13 toward the suction port 16 side.

  A mechanical seal 22 for maintaining the water tightness of the bearing portion 23 of the rotary shaft 12 provided in the casing 18 is disposed on the rear wall portion 24 on the motor 11 side in the casing 18. The mechanical seal 22 includes a substantially ring-shaped carbon seal 30 that is locked to the rear wall portion 24 in the casing 18 via a spring 28 and a plurality of packings 29, and the impeller in a state of being in close contact with the carbon seal 30 in a rotatable manner. 15 and a ring-shaped ceramic seal 31 disposed on the back side. During the operation of the pump 10, the ceramic seal 31 that rotates together with the impeller 15 is slid and rotated while being in close contact with the carbon seal 30, thereby maintaining water tightness.

  In the pump 10, since the inclined wall 21 inclined along the widened portion 20 exists in the casing 18 facing the widened portion 20 provided on the blade 19 of the impeller 15, the drive source side (motor) of the impeller 15 is provided. Since the area (hollow part) in the vicinity of the rotary shaft 12 on the (11 side) can be eliminated, turbulent flow does not occur and the feeding efficiency of the pump 10 increases.

  In addition, as shown in FIG. 1, the gap 26 between the blade 19 and the casing 18 is minimized by providing the casing 18 with the inclined wall portion 21 inclined along the widened portion 20 of the blade 19 of the impeller 15. The impeller 15 rotates with less resistance even in liquid (in water) having a higher viscosity coefficient than gas. Further, as shown in FIG. 3, since the blade 19 of the impeller 15 has a shape that is widened toward the outer periphery, the amount of liquid (water amount) to be fed can be increased, so the rotation speed of the impeller 15 is increased. Therefore, the feeding efficiency of the pump 10 can be improved, and the quietness is also excellent.

On the other hand, in the pump 10, as shown in FIG. 1, the blade thickness of the end edge 19 a on the discharge port 17 side of the impeller 15 is Lo, the outer diameter of the impeller 15 is D, and the casing 18 extends from the opening 13 of the shroud 14. When the thickness of the bell ring 25 projecting toward the suction port 16 is L ₁ , the range of 0 <L ₁ <30 × Lo / D and the gap 27 between the bell ring 25 and the casing 18 are set. Is in the range of 0.5 to 1.5 mm.

As described above, the blade thickness Lo, the outer diameter D of the impeller, and the thickness L ₁ of the bell ring 25 are set so as to satisfy the relational expression 0 <L ₁ <30 × Lo / D. Since it becomes resistance with respect to the water which backflows to the suction inlet 16 with a low pressure, and the water which flows back can be reduced, the feeding efficiency of the pump 10 further increases.

  In addition, since the gap 27 between the bell ring 25 and the casing 18 is in the range of 0.5 to 1.5 mm, water entering from the gap 27 can be reduced, which is effective in improving the feeding efficiency. is there. Furthermore, by setting the gap 27 in the above range, the impeller 15 can be easily assembled to the casing 18.

  Next, based on FIG. 5, the Western-style toilet 40 which is embodiment of this invention is demonstrated. As shown in FIG. 5, the Western-style toilet 40 includes a toilet body 41, a water tank 42, a pump 10, a control unit 43, and the like. The pump 10 shown in FIG. 5 is the same as the pump 10 described based on FIG.

  When the user operates a toilet flushing switch (not shown), the pump 10 is operated and the water W in the water tank 42 is fed toward the toilet main body 41. The water fed to the toilet main body 41 is branched into the rim flow path 44 and the jet flow path 45, and is fed into the toilet main body 41 as rim water discharge and jet water discharge, respectively. The rim water discharge cleans the inside of the ball part 41a of the toilet body 41, and the jet water discharge discharges the filth in the ball part 41a.

  Thus, since the Western style toilet 40 performs rim water discharge and zet water discharge simultaneously, it is necessary to instantaneously supply a large amount of water to the toilet body 41. However, the pump 10 is characterized by a small lift and a large flow rate. Therefore, a large amount of water can be supplied in a short time. For this reason, discharge of filth in the ball part 41a after the stool and cleaning of the ball part 41a are performed smoothly and accurately, and the Western-style toilet 40 exhibits an excellent drainage / washing function. Moreover, since the pump 10 can supply a large flow of water with a relatively small number of rotations, the pump 10 is also excellent in silence.

  The pump of the present invention can be widely used as a water supply means such as a flush toilet or a dishwasher, and can also be used in other fields as a liquid supply means.

DESCRIPTION OF SYMBOLS 10 Pump 11 Motor 12 Rotating shaft 12c Shaft center 13 Opening 14 Shroud 15 Impeller 16 Suction port 17 Discharge port 18 Casing 19 Blade 19a Edge part 20 Widening part 21 Slant wall part 22 Mechanical seal 23 Bearing part 24 Rear wall part 25 Bell ring 26, 27 Clearance 28 Spring 29 Packing 30 Carbon seal 31 Ceramic seal 40 Western-style toilet 41 Toilet body 41a Ball part 42 Water tank 43 Control part 44 Rim flow path 45 Zet flow path D Impeller outer diameter Lo Blade thickness L ₁ Bell ring Thickness of W water

Claims (3)

A rotating shaft that transmits the rotational force of the drive source; an impeller that is fitted into the rotating shaft and includes a shroud that is provided with an opening on the liquid suction side; and a suction port that houses the impeller and is positioned in front of the opening A casing having a discharge port positioned opposite to the outer periphery of the impeller, and a pump comprising:
The blades constituting the impeller are provided with a widened portion that expands in the axial direction from the axial center of the rotating shaft toward the outer periphery, and the casing facing the widened portion and the axial direction along the widened portion. The pump is characterized in that a sloped inclined wall portion is provided, and a portion where the blade and the casing face each other has a gap of a predetermined interval. The blade thickness of the discharge port side end of the impeller and Lo, the outer diameter of the impeller and D is the thickness of said support rings from the opening projecting toward the suction port side of the shroud and L ₁ When
2. The pump according to claim 1, wherein a range of 0 <L ₁ <30 × Lo / D is set, and a gap between the bell ring and the casing is in a range of 0.5 to 1.5 mm.   A Western-style toilet using the pump according to claim 1 or 2 as means for supplying washing water.

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