JP2964218B2 - Water pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a water supply pump for discharging hot and cold water, and more particularly to a structure of an additional member provided on an output shaft of a motor for driving an impeller.

[0002]

2. Description of the Related Art There is known a water supply pump in which an impeller is directly connected to an output shaft of a motor, rotates at a high speed, and discharges hot and cold water flowing in from a suction port in an upper direction of a water supply pump case from a discharge port opened in a lateral direction of the case. ing.

[0003] Separately, Japanese Unexamined Patent Publication No. 5-31 shown in FIG.
There is a water supply pump 1 shown in No. 031. In this water supply pump 1, the drive chamber 2 and the pump chamber 3 are integrally formed via a partition plate 4 that separates a drive chamber case 14 and a pump chamber case 13 that are concentrically engaged. Drive room 2
Has a rotatable magnet 6 attached to an output shaft 7 of a motor 5, and a pump chamber 3 has a plurality of blades 9 in a radial form.
And an impeller 8 provided with a magnet 11 below the blade 9 is a bearing 12 having a spherical tip at the direction of the partition plate 4.
The bearing 12 is slidably supported in the thrust direction by a fixed shaft 10 fixed by a rib 16 provided on the inner surface 17 of the suction port while being fixed to the shaft and movable in the thrust direction and rotatable. ing. The rotatable magnet 6 attached to the output shaft 7 of the motor 5 and the magnet 11 of the pump chamber opposed in the thrust direction via the partition plate 4 are magnetically coupled via the partition plate 4, and the output of the motor 5 is output. Axis 7
When the magnet 6 fixed to the pump chamber 3 rotates, the pump chamber 3
Is rotated, and power is transmitted to the impeller 8 with this rotation.

In this configuration, when the motor 5 rotates, the magnet 6 connected to the motor 5 is magnetically coupled to the magnet 11 located between the partition plates 4 in the thrust direction and rotates the centrifugal impeller 8. . Suction port 15 of pump chamber case 13
The hot and cold water inside the container that has been sucked in is sent out to a discharge port opened in the lateral direction of the pump chamber case 13 (not shown) by the centrifugal force of the impeller 8.

The tip of the spherical bearing 12 is
Usually, since the magnet 11 in the impeller 8 and the magnet 6 in the drive chamber 2 are magnetically coupled, they are in contact with the partition plate 4, and the impeller 8 rotates from this state. When the rotation speed of the impeller 8 is increased to increase the discharge amount, the internal pressure of the pump chamber 3 increases, and the impeller 8 floats in a direction away from the partition plate 4. Accordingly, the impeller 8 rotates while being lifted from the partition plate 4 to discharge hot water. As described above, when the hot and cold water is discharged, the pressure in the pump 1 increases, and the impeller 8 moves in a direction away from the partition plate 4 of the pump chamber 3. However, when the driving of the motor 5 is stopped, the pressure in the pump 1 decreases. At the same time, since the magnet 11 of the impeller 8 and the magnet 6 of the drive chamber 2 are attracting, the tip of the bearing 12 of the impeller 8 comes into contact with the partition plate 4 in the pump 1.

[0006]

In a water supply pump structure in which an impeller is directly connected to a motor output shaft, when the impeller rotates, the centrifugal force generated by the rotation results in a delicate force that each blade receives due to the flow of hot and cold water. Therefore, the output shaft of the motor may hit the motor bearing irregularly.

[0007] Further, in the case where the magnet 6 of the output shaft 7 of the motor 5 is magnetically coupled to the magnet 11 attached to the impeller 8 via the partition plate 4 as shown in FIG. A change in magnetic coupling between the magnet 11 of the impeller 8 and the magnet 6 of the drive chamber 2 is transmitted to the motor output shaft 7 with the radial movement caused by the rotation of the impeller 8,
A movement occurs in which the motor output shaft 7 hits the bearing 21 irregularly. This movement may not only generate mechanical noise but also shorten the life of the device.

In view of the above situation, the present invention provides a water supply pump having a structure in which an impeller is directly connected to an end of a motor output shaft, and a magnet in which a motor output shaft magnet is attached to the impeller via a partition. Even when the impeller rotates by magnetic coupling with the motor, the motor's output shaft exerts a lateral pressure on the motor's output shaft against the force of irregular movement of the motor's output shaft caused by the change in fluid due to the rotation of the impeller. A water supply pump that deviates the output shaft of the motor in a certain direction by the elastic force of an elastic member that constitutes an additional member that imparts a force to eliminate irregular contact with the bearing, and that does not cause noise. It is something to offer.

[0009]

Means for Solving the Problems To achieve the above object, the present invention provides a water supply pump having a motor, an impeller rotationally driven by an output shaft of the motor, and a pump chamber surrounding the impeller. Placed on the side
A bearing for supporting the output shaft; and a bearing for applying a side pressure to the output shaft and pressing the output shaft against an inner surface of the bearing.
It is provided an elastic member which is disposed in the vicinity of.

[0010] Also, a motor, one magnet fixed to the output shaft of the motor, an impeller having the other magnet opposed to the one magnet and magnetically coupled, and one of the one magnet and the other magnet is disposed between, and in the water supply pump and a partition wall separating the pump chamber to drive the drive chamber and the impeller for driving one of the magnets above, the in-
A bearing arranged on the propeller side and supporting the output shaft; and applying a side pressure to the output shaft to press the output shaft against the inner surface of the bearing.
Therefore, an elastic member is provided near the bearing .

In the present invention, the output shaft on the impeller side of the motor is provided with an elastic member for applying a side pressure as an additional member. Therefore, even if a force for eccentricizing the output shaft end portion due to the rotation fluctuation of the impeller acts, the output can be reduced. The shaft is biased to one side and the bearing
Runode is pressed against the inner surface, it is possible to eliminate the motion striking irregular the bearing with a simple configuration, suppress the mechanical noise generated by the movement, it is FIG Rukoto the life of the device.

[0012]

FIG. 1 is a side sectional view of a water supply pump as an example of an embodiment of the present invention, and FIG. 3 is a plan sectional view showing the vicinity of an additional member provided in the water supply pump.
Each is contrasted with the conventional example shown in FIG.
FIG. 4 is a perspective view of a main part near an additional member. In each of the drawings, the same reference numerals denote the same functions and functions as those in FIG. The operation and effect are the same even in a water supply pump structure in which an impeller is directly connected to the motor output shaft end.

1 to 4, a driving chamber 2 and a pump chamber 3 of a water supply pump 1 are separated from each other by a partition wall plate 4 serving as a partition wall having a cylindrical projection 4a formed at the center.
The drive chamber case 14 and the pump chamber case 13 are integrally formed by being connected by screws or the like. here,
The cylindrical projection 4a is formed by drawing or the like. The driving room 2 formed by the partition plate 4 and the driving room case 14 has a motor 5 which is one member of the motor 5.
There is a rotatable magnet 6 incorporated in a rotating plate 22 fixed to the output shaft 7 of the present invention. In the pump chamber 3 formed by the pump chamber case 13 and the partition plate 4, a plurality of blades 9 are provided radially with a rotation shaft 18 at the center, and the magnet 6 is provided below the blade 9. An impeller 8 having opposed magnets 11 and integrally forming and fixing them with a fixing plate is arranged. The impeller 8 is rotatable by the magnetic attraction between the magnet 6 and the magnet 11. The upper end surface 18a of the rotation shaft 18 of the impeller 8 is opposed to the center portion 19a of the thrust receiver 19 fixed to the suction port 15 at a short distance.

The rotating shaft 18 has a concave portion 18b at the lower end (see FIG. 1), and the projection 4a is fitted into the concave portion 18b. The projection 4a becomes the center of rotation of the rotating shaft 18. Note that, as shown in FIG. 1, the rotation shaft 18 is engaged with only a part of the lower end of the projection 4a, so that the so-called sliding motion is easily generated. However, the upper end surface 18a of the rotating shaft 18
Is formed on a flat surface, and the central portion 19a of the thrust receiver 19 is also formed on a flat surface.
It is supported by the central portion 19a of the flat surface, so that the scribing movement is prevented. The magnet 6 and the magnet 1
Numerals 1 are alternately magnetized in the circumferential direction so that the N and S poles are alternately arranged. When the magnet 6 rotates, the magnet 11 also rotates by the magnetic action.

The output shaft 7 of the motor 5 is supported by a bearing 21 made of an oil-impregnated alloy on the motor side. A rotating plate 22 is fixed to an end of the output shaft 7 extending toward the center of the partition plate 4. An additional member 20 provided for applying a lateral pressure to the output shaft 7 is disposed substantially at the center between the bearing 21 and the rotating plate 22. One end of a leaf spring 23, which is an elastic member that resilients in the horizontal direction and constitutes the additional member 20, is provided with a screw 38 for fixing the motor 5 to the drive chamber case 14.
It is screwed together and fixed. In the vicinity of the threaded portion, there are a positioning projection 29 for positioning the leaf spring 23 and a fitting hole 28. An opening 24 is formed at the other end of the leaf spring 23 fixed in this manner, and the opening 24 has a rib 26 annularly surrounding the circumferential portion of the collar 25 through which the output shaft 7 of the motor 5 passes. Are engaged and the collar 25
As a result, the lateral pressure is applied to the output shaft 7 of the motor 5. In this example, the urging force of the leaf spring 23 acts in the direction indicated by the arrow A in FIG. 3, and a lateral pressure acts on the collar 25 and the output shaft 7 in the direction indicated by the arrow A. The collar 25 is formed into a disk shape with a member such as a resin, and a hole 27 is formed in a central portion for rotatably passing the output shaft 7. Grease is applied to an inner peripheral surface of the hole 27. is there.

The hole 27 provided in the collar 25 is made larger than the outer diameter of the output shaft 7,
Part of the inner surface of the hole 27 is configured to contact part of the outer surface of the output shaft 7. The contact position of the collar 25 is held by the spring pressure of the leaf spring 23. Here, the opening 24 prevents the collar 25 from moving in the axial direction when the pump 1 is driven.
The rib 26 is engaged with the rib 26 in such a manner as to enter the opening 24.

Prior to fixing the rotary plate 22 to the end of the output shaft 7 of the motor 5, the additional member 20 allows the output shaft 7 to pass through the hole 27 of the collar 25 and at the same time the other end of the leaf spring 23. Assembled by engaging opening 24 with rib 26 of collar 25. Here, the direction of the side pressure applied to the collar 25 and the output shaft 7 by the leaf spring 23 is
Is preferably set in consideration of the direction of gravity when the device is used, for example, in a state where it is incorporated in a pot, but may be set in any direction as long as the spring pressure is appropriately set.

In this configuration, when the motor 5 rotates, the magnet 6 connected to the motor 5 is magnetically coupled to the magnet 11 located between the partition plates 4 in the thrust direction to rotate the centrifugal impeller 8. . Suction port 15 of pump chamber case 13
The hot and cold water inside the container is sucked into the discharge port 13 opened in the lateral direction of the pump chamber case 13 by the centrifugal force of the impeller 8.
a, and hot and cold water is discharged in the direction indicated by arrow B in FIG. At this time, the two magnets 6,
Although the impeller 8 may move upward in FIG. 1 against the magnetic coupling 11, the impeller 8 is stably received by the center portion 19 a of the thrust receiver 19 and rotates stably. When the hot and cold water is discharged, the output shaft 7 of the motor 5 is
The hole 27 of the collar 25 receives an appropriate lateral pressure that is deviated in a certain direction due to the resilience. As a result, the output shaft 7 of the motor 5
Slides on the inner surface of the hole of the collar 25, and the rotating plate 22 holding the magnet 6 also rotates while receiving a force biased in a certain direction. As a result, when the impeller 8 rotates, even if the rotating plate 22 receives a magnetic force in a direction in which the rotating plate 22 causes the sliding motion due to the magnetic action, the operation in which the output shaft 7 of the motor 5 hits the bearing 21 irregularly is prevented. Therefore, the abnormal increase in the current of the motor 5 and the rattling sound generated from the bearing 21 on the motor side are almost eliminated. Note that the spring pressure is appropriately determined in consideration of the pressure fluctuation applied to the impeller 8 when the impeller 8 rotates.

Further, in this embodiment, the problem of step-out which tends to occur when the motor 5 is started can be solved. That is, in the so-called magnetic coupling type water supply pump 1 as in this example, the torque T acting on the magnetic coupling part by the magnet 6 and the magnet 11 is stable as shown by the solid line in FIG. The maximum torque T2 at the time of starting is higher than the torque T1 at the time. And this maximum torque T2 is
When the coupling force between the magnets 6 and 11 (= transmissible torque) is exceeded, the rotation of the motor 5 is reduced by the rotation of the magnets 11 on the impeller 8 side.
, And it becomes idle (= step-out). Therefore, conventionally, the distance between the magnet 6 and the magnet 11, the inertia of each of the magnets 6, 11 and the amount of magnetic flux are set and adjusted with high accuracy.

On the other hand, in this embodiment, the output shaft 7 of the motor 5 is
7 receives a moderate lateral pressure that is biased in a certain direction. As a result, the output shaft 7 of the motor 5 receives a braking force with respect to its rotation. In addition, the grease applied to the inner peripheral surface of the hole of the collar 25 becomes a viscous load at the time of starting rotation, and this load also becomes a braking force. Then, when the rotation becomes stable, the temperature of that portion increases, the viscous load of grease decreases, and the motor 5 is stabilized at a predetermined torque. By such an action, the torque T acting on the magnetic coupling portion by the magnet 6 and the magnet 11 has a shape shown by a dotted line in FIG. That is, the torque T rises more gently than before and becomes the maximum torque T3 at the time of startup.
It is lower than the conventional maximum torque T2. Then, as compared with the conventional case, the temperature gradually decreases and becomes the torque T1 in the stable state.

As a result of suppressing the maximum torque as described above,
Step-out is less likely to occur. Further, the distance between the magnet 6 and the magnet 11, the inertia of each of the magnets 6, 11 and the amount of magnetic flux need not be set and adjusted with high precision, and the productivity is greatly improved. In addition, because there is enough design margin for step-out,
The size of the magnet 6 and the magnet 11 can be reduced, and the size of the water supply pump 1 can be reduced. Furthermore, it is possible to adopt a cheap material that can be easily produced for the magnet 6 and the magnet 11, and it is possible to reduce the price and increase the productivity.

FIG. 5 is a perspective view of another embodiment of the additional member for applying the biasing force. In this additional member 30,
The collar 33 is formed of a resin member having a small coefficient of friction, such as Teflon (fluororesin), and passes the output shaft 7 of the motor through a hole 35 formed in the center. And
An engaging portion 32 of a helical spring 31 which is hooked on a hook formed at one end of a drive case (not shown) and contracts in the direction of the arrow.
Is locked to one end locking portion 34 of the collar 33. There is a position adjusting plate 36 that defines the height position of the collar 33 in a direction compatible with the spring 31 around the output shaft 7 of the motor,
The other end of the collar 33 is slidably engaged with the opening 37. Accordingly, the additional member 30 applies a lateral pressure to the output shaft 7 of the motor by the contraction force of the spring 31 similarly to the additional member 20 shown in FIG.

In addition, this water supply pump, besides water and hot water,
Other fluids, such as oils, chemicals, air, etc., can of course be used.

[0024]

According to the present invention, as described above in the present invention, in
An elastic member that applies lateral pressure to the output shaft of the motor on the propeller side is provided, so that eccentricity is suppressed even if an eccentric force acts on the output shaft end due to a change in hot water flow or a change in magnetic coupling. be able to. As a result, the generation of mechanical noise can be suppressed, and the noise can be reduced and the life can be extended without affecting other parts of the pump, such as greatly increasing the current of the motor. Moreover high economical because it is simple configuration no longer, further eccentricity of preventing the impeller
Pump efficiency is also increased. In addition, the impeller
Motor from the stator part of the motor.
The effect of heat can be reduced.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a water supply pump according to an embodiment of the present invention.

FIG. 2 is a plan view of a thrust receiver used in the embodiment of FIG.

FIG. 3 is a plan sectional view of FIG. 1;

FIG. 4 is a perspective view of a main part near an additional member of the present invention.

FIG. 5 is a perspective view of the vicinity of another additional member of the present invention.

FIG. 6 is a side sectional view of a conventional water supply pump.

FIG. 7 is a graph for explaining a torque acting on a magnetic coupling portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water supply pump 2 Drive room 3 Pump room 4 Partition board (partition) 5 Motor 6 Magnet 7 Motor output shaft 8 Impeller 11 Magnet 20 Additional member 21 Bearing 22 Rotating plate 23 Leaf spring (elastic member) 24 Opening 25 Color 26 Rib 27 holes

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F04D 13/02 F04D 29/04 F04D 29/66

Claims (2)

(57) [Claims] 1. A water supply pump having a motor, an impeller rotatably driven by an output shaft of the motor, and a pump chamber surrounding the impeller, the water pump being disposed on the impeller side.
A bearing for supporting the output shaft; and a bearing for applying a side pressure to the output shaft and pressing the output shaft against an inner surface of the bearing.
Water supply pump, characterized in that a resilient member disposed in the vicinity of. 2. A motor, one magnet fixed to an output shaft of the motor, an impeller having another magnet facing and magnetically coupled to the one magnet, and one of the magnets and the other magnet. It is disposed between, and in the water supply pump and a partition wall separating the pump chamber to drive the drive chamber and the impeller for driving one of the magnets above, the impeller
A bearing disposed on the side of the bearing for supporting the output shaft, and applying a side pressure to the output shaft to press the output shaft against the inner surface of the bearing.
Water supply pump, characterized in that a resilient member disposed in the vicinity of the bearing for.