JPH09291893A - Dc driving pump for pumping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-sized and low-cost water-pumping pump capable of emitting heat of a coil by water cooling, easily adjusting the water amount, and easily performing disassembling and cleaning. SOLUTION: In a pump case 10, a coil 1, a yoke 16, and a base plate 3 on which a driving circuit is loaded are housed on the upper part through a partition wall 18. A fan 2 constituted of a plurality of vanes is rotatably attached to a shaft 5 supported to a shaft supporting part 17 on the lower part partitioned by the partition wall 18. When current is passed to the coil 1 by controlling the driving circuit by DC, the fan 2 is rotated, and water is sucked from a suction port 8 and discharged from a pumping port 9 through a path as shown by arrows C1, C2, C3. Since a pumping pump can be manufactured into a small size at low cost, since heat generation can be released by water cooling, and since DC voltage having low voltage is used, there is no risk even if water enters in an accident, and disassembling and cleaning are easy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump for pumping water, which is used for purifying water in a water tank of tropical fish, goldfish and the like, and for circulating oxygen by supplementing oxygen in the water tank.

[0002]

2. Description of the Related Art Various pumps have been proposed for pumping water used in water tanks and the like. FIG. 8 shows an example thereof and is a cross-sectional view showing the structure of a spiral pump (Japanese Patent Publication No. 8-1194). In this spiral pump, the impeller 42 is provided in the first closed chamber 41, and the second closed chamber 4 is provided.
3, the rotors 44 are respectively housed, and the cylindrical elements 45 and the protrusions 46 fixed to the impeller 42 are engaged with the teeth 47 fixed to the rotor 44 to rotate coaxially. An iron core (not shown) is provided outside the case 48, and an impeller 42 engaged with the rotor 44 is rotated by passing an electric current through a coil (not shown) wound around the iron core to rotate the impeller 42 from the water intake pipe 49. It takes in water and sends it out to the discharge pipe 50.

[0003]

This spiral pump has the following problems.
Since the rotor and the impeller are connected in cascade, the case needs to secure a space in the longitudinal direction. Moreover, the iron core and the coil are provided outside the case of the rotor part, and the rotor must be lengthened in the longitudinal direction in order to secure a sufficient magnetic force transfer surface, and the iron core and the coil are correspondingly enlarged. Therefore, the outer shape does not become smaller than a certain size. The water tanks range from large ones to relatively small ones, and small water tanks also require a small pumping pump because the circulating water channel system is also small.

Further, since dust and dirt adhere to the impeller and the rotor when it is used for a while, it is necessary to disassemble and clean it every regular period. Therefore, although it is configured so that it is relatively easy to remove the plate portion that is screwed to remove the rotor and the impeller, the removal and assembly are still complicated, and further simplification of disassembly and cleaning is desired. .

Further, heat is generated from an iron core and a coil arranged outside the rotor case, but it is desired to suppress the temperature rise of the pump as much as possible. In addition, this spiral pump is driven by AC100V and has a structure that prevents electric leakage, but when an unexpected accident or the like occurs and water enters the coil part, for example. It is dangerous for AC100V to flow into the water tank.

FIG. 9 shows still another example and is a sectional view showing the structure of a liquid pump of an electric water heater (Japanese Patent Publication No. 8-6710). A magnetic transmission means 55 having a magnet 55a mounted thereon is attached to an output shaft of a drive source (motor) 58. Magnet 56 with the partition wall 57 in between
An impeller 56 equipped with a is arranged, and blades 61 are attached to the impeller 56. The magnetic transmission means 55 is rotated by driving the drive source 58, and the impeller 56 is coupled and rotated by the magnetic force, and the blades 61 are rotated. Hot water is sucked in through the suction port 59 and sent out through a discharge port on the side surface (not shown).

In this liquid pump, a drive source (motor) is not arranged in a part of a case 60 constituting a hot water suction / discharge portion, but a drive source 58 is provided outside. Therefore, the shape of the pump is increased in the vertical direction. Further, since another drive body, that is, the magnetic transmission means and the impeller are provided on the output shaft of the motor, the structure of the pump itself is complicated.

An object of the present invention is to solve all of the above-mentioned problems, and the heat generation of the coil can be dissipated by water cooling, and the amount of water can be easily adjusted and the disassembly and cleaning can be easily performed. It is to provide a low cost DC drive pump for pumping water.

[0009]

In order to solve the above-mentioned problems, in a DC pump for pumping water according to the present invention, a pump case is divided into a flow passage side cell and a space side cell by a partition wall, and the flow channel near the central portion of the partition wall. One side of a fan having a shaft support portion on a side surface, a coil arranged in close contact with the space side surface of the partition wall, a substrate having a drive circuit mounted on the coil, and a plurality of blades Magnet is disposed on the side of the shaft, and the fan is inserted into the shaft supported by the shaft support portion to rotatably support the fan on the side of the flowing water channel so that the magnet faces the coil through the partition wall. The drive circuit causes a current to flow through the coil to rotate the fan by an electromagnetic induction action to suck water from the water intake port and discharge the water from the water intake port. Further, the shaft is press-fitted and fixed to the shaft supporting portion of the partition wall in the present invention. Further, in the present invention, a second shaft support portion is provided on a surface side opposite to the one surface side of the fan, the shaft is press-fitted and fixed to the second shaft support portion, and the fan is rotatably inserted into the shaft. The other end of the shaft is supported by the shaft support portion of the partition wall. Further, the shape of the fan is asymmetrical about the shaft.

According to the above construction, since the coil is arranged in close contact with the side surface of the partition on the side of the flowing water which is in contact with the water, the flowing water can be used to efficiently radiate heat. In addition, the amount of pumped water can be easily adjusted by adjusting the drive voltage for DC drive, and even if water enters the drive circuit or the like due to an accident or the like, it is not an AC100V power source, and therefore danger can be avoided. Furthermore, by removing the running water channel side lid from the pump case, removing the cap from the shaft supported by the shaft support portion and pulling out the fan, disassembly and cleaning can be easily performed. Further, with the configuration of the present invention, downsizing and cost reduction can be realized as compared with the conventional pump for pumping water.

[0011]

Embodiments of the present invention will be described below in more detail with reference to the drawings. FIG. 1 is a front sectional view and a bottom view showing an embodiment of a pump for pumping water according to the present invention. Note that the bottom view is shown with the flowing water channel side lid omitted. The pump case 10 is divided into a space side cell A and a water flow path side cell B by a thin partition wall 18. Partition wall 1
A shaft support 17 is provided at the center of 8 on the side of the flowing water channel cell B. The coil 1 is arranged in close contact with the space-side cell A surface of the partition wall 18, and the yoke 16 is placed thereon. Substrate 3 with drive circuit 4 mounted on yoke 16
Has been posted. The coil 1, the yoke 16, the substrate 3
The space-side cell A accommodating the drive circuit 4 is sealed by the lid 11. It should be noted that the space side cell A can be filled with resin or the like for further waterproofing treatment.

On the other hand, the fan 2 is composed of six blades 2a, and a magnet 6 is embedded on one surface side.
The fan 2 is rotatably inserted into a shaft 5 whose one end is press-fitted into a shaft support portion 17, and a plastic cap 7 is press-fitted into the other end of the shaft 5 to prevent the fan 2 from coming off. As a result, the coil 1 and the magnet 6 face each other via the partition wall 18. After the fan 2 is attached to the shaft support 17 in this manner, the running water channel side lid 12 is covered.

The six blades 2a of the fan 2 are asymmetric with respect to the shaft 5, and the fan 2 rotates counterclockwise when viewed from the bottom surface. In the present invention, since the rotation direction can always be rotated in one direction by DC drive, the shape of the fan 2 is such that water can be efficiently sent out when rotating in the counterclockwise direction. Furthermore, the tip of the blade may be bent as shown in 2b. FIG. 2 is a bottom view of a pump showing another embodiment of the fan. The fan 13 of this embodiment is symmetrical with respect to the shaft. Although the shape is not efficient as compared with FIG. 1B, the object of the present invention can be achieved.

FIG. 3 is a plan view in which the cover and drive circuit of the space side cell of FIG. 1 are omitted. Four coils 15 are arranged as shown in FIG. In addition to this, there are 6 coils 15,
It can be arranged as 8 pieces. In FIG. 1, the drive circuit 4 controls the current flowing through the coil 1. As a result, a rotational force is applied to the fan 2 in the counterclockwise direction by electromagnetic induction through the partition wall 18, water enters from the water intake port 8 and is discharged to the water intake port 9 through the paths of arrows C1, C2 and C3.

FIG. 4 is a front sectional view and a bottom view showing another embodiment of the present invention. The blades 22a of the fan 22 of this embodiment are symmetrical with respect to the shaft when viewed from the bottom, but the shape when viewed from the side is shown in FIG.
Different from (a). In FIG. 1A, the portion connecting the blades 2a is horizontal, but the portion 22b connecting the blades 22a is horizontal.
Has an inclined shape. Further, the fan 22 and the magnet 26 are separated from each other, and the rotation of the magnet 26 is transmitted to the fan 22 by the rotation transmission mechanism. The shapes of the other parts are the same.

FIG. 5A is a side sectional view and a plan view of a magnet assembly including the magnet and the bearing member of FIG.
FIG. 2B is a side sectional view of the fan and a plan view of the shaft hole portion. A bearing member 33 made of plastic or the like and having a shaft hole 33b in the central portion is fixed to the magnet 26 by an adhesive or a press fit to form a magnet assembly. A protrusion 33 a is provided on the lower surface of the bearing member 33. The fan 22 has a shaft hole 22c in the central portion, and is provided with a semi-annular groove 22b for engaging with the protrusion 33a. The protrusion 33a and the semicircular groove 22
A rotation transmission mechanism is constituted by b. In FIG. 4A, the shaft 27 fixed to the shaft support 31 by press fitting is inserted into the shaft hole 33b of the magnet assembly and the shaft hole 22c of the fan 22 at the other end of the shaft 25 to prevent the cap 27 from coming off. And press-fit.

The protrusion 33a is formed in the semicircular groove 22b as shown in FIG.
It is loosely fitted as shown in (b). Therefore, even if the magnet assembly starts rotating, the fan 22 does not rotate until the protrusion 33a rotates by a certain angle, and the fan 22 starts rotating after the protrusion 33a hits the wall 22d of the groove 22b. There is a characteristic that no load is applied at the beginning of rotation, and a load is applied after a little rotation, so that an extra load is applied to the motor at the beginning of rotation. As described above, in the embodiment of the present invention, the example in which the shaft is press-fitted into the shaft support portion and the fan is rotatable with respect to the shaft has been described.
Even if the shaft is fixed to the fan and the shaft is rotatable with respect to the shaft support, the same operation can be performed.

FIG. 6 is a front sectional view and a bottom view showing still another embodiment of the present invention. This embodiment is characterized in that a shaft 35 that rotatably supports a fan 37 is supported at both ends. A shaft support portion 36 is provided at the center of the partition wall of the pump case 40, and a shaft support portion (second shaft support portion) 34a is provided at the center of the water absorption portion of the flow passage side lid 34. The shaft 35 is press-fitted and fixed to the shaft support portion 34 a, the fan 37 is rotatably inserted into the shaft 35, and the other end of the shaft 35 is inserted into the shaft support portion 36 to be incorporated. When the running water side lid 34 is removed, the fan is also removed at the same time, so disassembly and cleaning becomes easier.

FIG. 7 is a graph showing the pumping capacity characteristics of the pump for pumping water. The graph plotted with white circles shows the input versus the maximum flow rate (liter / min), and the graph plotted with the black circles shows the input versus the maximum head (cm). It can be seen that the maximum flow rate and the maximum head are increased when the input voltage is changed from 3.5V to 5V.

[0020]

As described above, according to the present invention, the pump case is divided into the flow passage side cell and the space side cell by the partition wall, and the shaft support portion is provided on the side surface of the flow passage near the center of the partition wall.
The coil is placed in close contact with the space side surface of the partition wall, the board on which the drive circuit is mounted is further provided on the coil, and the magnet is placed on one side of the fan composed of multiple blades and supported by the shaft support section. The fan is rotatably supported on the flowing water passage side so that the magnet faces the coil via the partition wall by inserting the fan into the shaft.

Therefore, the vertical shape can be reduced, and a pump for pumping water applicable to a small water tank or the like can be manufactured. Further, since the stator is provided by DC drive on the outside of the partition wall and the fan with the magnet is installed on the side of the flowing water channel facing the partition wall, the pumping amount can be easily adjusted by adjusting the drive voltage and the accident AC even if water enters the drive circuit due to
Since it is not a 100V power source, it is possible to realize a low cost pumping pump that can avoid the danger. Since the coil is arranged in close contact with the side surface of the flowing water channel on the side opposite to the partition wall in contact with water, it is possible to efficiently radiate heat using the flowing water. Further, the cover for the flowing water passage is removed from the pump case, and the fan is pulled out from the shaft support portion, so that the fan can be easily disassembled and cleaned.

[Brief description of drawings]

FIG. 1 is a front sectional view and a bottom view showing an embodiment of a pump for pumping water according to the present invention.

FIG. 2 is a bottom view showing another embodiment of the fan.

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

FIG. 4 is a front sectional view and a bottom view showing another embodiment of the present invention.

5A and 5B are a side cross-sectional view and a plan view showing details of the assembly member including the magnet and the bearing member and the fan of FIG.

FIG. 6 is a front sectional view and a bottom view showing still another embodiment of the present invention.

FIG. 7 is a graph showing pumping capacity characteristics of a pump for pumping water.

FIG. 8 is a sectional view showing an example of a conventional centrifugal pump.

FIG. 9 is a sectional view showing an example of another conventional pump.

[Explanation of symbols]

 1 ... Coil 2, 13, 22, 37 ... Fan 3 ... Substrate 4 ... Drive circuit 5, 25, 35 ... Shaft 6, 26, 38 ... Magnet 7, 27 ... Cap 8, 28 ... Water intake 9, 29 ... Pumping port 10, 14, 30, 40 ... Pump case 11 ... Lid 12, 32, 34 ... Flow channel side lid 15, 21, 39 ... Coil 16 ... Yoke 17, 31, 36 ... Shaft support portion 33 ... Bearing member

Claims (4)

[Claims] 1. A pump case is divided into a flow channel side cell and a space side cell by a partition wall, and a shaft support portion is provided on a side surface of the flow channel near the center of the partition wall.
A coil is arranged in close contact with the space side surface of the partition wall, a substrate on which a drive circuit is mounted is further provided on the coil, and a magnet is arranged on one side of a fan composed of a plurality of blades. By inserting the fan through a shaft supported by a supporting portion, the fan is rotatably supported on the flowing water channel side so that the magnet faces the coil through the partition wall, and the drive circuit applies a current to the coil. A DC drive pump for pumping water, wherein the fan is rotated by an electromagnetic induction action by flowing the water to suck water from a water suction port and discharge the water from the water pumping port. 2. The pumping D for pumping up water according to claim 1, wherein the shaft is press-fitted and fixed to a shaft support portion of the partition wall.
C drive pump. 3. The second side is provided on the side opposite to the one side of the fan.
A shaft support portion is provided, the shaft is press-fitted and fixed to the second shaft support portion, a fan is rotatably inserted into the shaft, and the other end of the shaft is supported by the shaft support portion of the partition wall. The DC drive pump for pumping water according to claim 1. 4. The DC drive pump for pumping water according to claim 1, wherein the shape of the fan is asymmetrical about the shaft.