JPH022073Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a brushless cascade pump used for pumping fluid as a water circulation pump, a fuel supply pump, or the like.

[Prior art]

As a brushless type cascade pump, the applicant has filed Utility Application No. 59-42764 (Utility Model Application No. 156851-1987).
proposed something as shown in Fig. 4.

This brushless cascade pump A includes a pump case 102 consisting of a first and a second pump case 100 and 101 which are made of synthetic resin and can be divided into upper and lower parts, and an impeller rotatably provided inside the pump case 102. 103, a coil 104 embedded in the first and second pump cases 100, 101, a magnet 105 provided in the impeller 103, and the pump case 102.
A pair of disk-shaped yokes 109 and 110 are attached to the pump case 102 so as to be in contact with the upper and lower surfaces 107 and 108 of the pump case 102, and to sandwich the pump case 102 therebetween.

In this cascade pump A, upper and lower surfaces 107, 108 of a pump case 102 are formed by overlapping the first and second pump cases 100, 101 with an O-ring (not shown) interposed between them.
The pair of yokes 109 and 110 are brought into contact with each other, and then the pump case 102 and the yokes 109 and 110 are integrally fastened using a plurality of screws 111.

That is, this brushless type cascade pump A includes a yoke 109, a magnet 105, and
The magnetic field formed between the yoke 110 and the magnet 105 is interposed with a coil 104, forming a kind of motor.
When the impeller 103 is energized, the impeller 103 having the magnet 105 rotates at high speed, sucks the fluid into the pump case 102 from the suction pipe 112, and then accelerates and pressurizes it in the tangential direction of the impeller 103 due to the rotation of the impeller 103, and flows the fluid into the discharge pipe. It is designed to be discharged from 113.

Incidentally, the yokes 109 and 110 are made of a ferromagnetic material having a thickness sufficient to form a magnetic field corresponding to the magnetic force of the magnet 105.

(Problems to be Solved by the Invention) However, in the case of such a brushless type cascade pump, a pair of upper and lower disk-shaped yokes 109, 110 are brought into contact with the upper and lower surfaces 107, 108 of the pump case 102, and a plurality of The pump case 102 and the yokes 109, 110 are connected by screws 111.
Therefore, when the impeller 103 rotates at high speed and the pressure inside the pump case 102 becomes high, the screws 111 will stretch or the pump case 102 made of synthetic resin will bend and deform, causing the pump case to close. The clearance t between the impeller 102 and the impeller 103 could not be maintained at the set value.

This enlargement of the clearance t may reduce the pump efficiency or reduce the magnet 1 of the impeller 103.
The gap _t1 between 05 and the coil 104 was enlarged, and the motor efficiency was reduced.

This inconvenience can be solved to some extent by making the yokes 109 and 110 thicker than the thickness required to form a magnetic field corresponding to the magnetic force of the magnet 5, thereby increasing the rigidity of the yokes. In this case, new disadvantages arise, such as increased weight and increased cost.
However, in this case as well, it is not possible to prevent the screw from elongating.

Furthermore, since a plurality of screws 111 are used during assembly, the number of parts is large, the number of man-hours required for installation is also large, and it is necessary to tighten the screws 111 evenly, which is time-consuming.

(Means for solving the problem) Therefore, the present invention was devised with the aim of solving the above-mentioned problems. The pump case is composed of a first pump case and a second pump case that can be divided into upper and lower parts, and is provided with a suction pipe and a discharge pipe, an impeller that is rotatably provided inside the pump case, and an impeller that is embedded in the pump case. The means is characterized in that it comprises a coil, a magnet provided on the impeller at a position opposite to the coil, and a yoke tightly surrounding the upper and lower surfaces and side surfaces of the pump case.

(Function) Therefore, in the brushless type cascade pump of the present invention, since the upper and lower surfaces and side surfaces of the pump case are closely held by the yoke, the internal pressure of the pump case is increased, and the synthetic resin pump case is Even if the pump case tries to bend and deform, the deformation of the pump case can be suppressed by being held by the yoke.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.
In describing this embodiment, a brushless cascade pump used as a water pump or fuel pump for a vehicle radiator will be taken as an example.

First, the configuration of the first embodiment shown in FIG. 1 will be explained.

Reference numeral 1 denotes a pump case, which is formed by overlapping a first pump case 2 and a second pump case 3, which are made of synthetic resin and can be divided into upper and lower parts, with an O-ring (not shown) interposed between them. A coil 4 connected to an external power source (not shown) is embedded in the pump case 1.
The upper and lower surfaces of the pump case 1 are flat surfaces with no protrusions, so that a yoke (described later) is in close contact with the upper and lower surfaces of the pump case 1. In addition, there is a suction pipe 7 on the periphery.
and a discharge pipe 8 are provided protrudingly.

Reference numeral 9 denotes an impeller, which is rotatably provided inside the pump case 1 by a rotary shaft 31, and has a blade portion 10 on the outer periphery and a magnet with alternating north and south poles magnetized inside. It has a section 11.

Note that the yoke, the magnet portion 11, which will be described later,
The coil 4 forms a type of motor that rotates an impeller.

Reference numeral 13 denotes a yoke, and this yoke 13 is formed by molding metal into a U-shaped box shape to form a box-shaped peripheral side wall portion of the yoke 13 that extends to the side surface of the pump case 1. are combined as a single piece over a wide U-shaped area, and this yoke 13
from the opening 14 provided in the pump case 1.
is press-fitted. The width l of the inner surface of the yoke 13 is approximately the same as the diameter of the pump case 1, and the height m of the inner surface is slightly smaller than the height of the pump case 1.

Next, the operation of the first embodiment will be explained.

During assembly, the impeller 9 is rotatably supported and the first pump case 2 and second pump case 3 are assembled via an O-ring. after that,
Press the pump case 1 into the yoke 13 through the opening 14 of the yoke 13, and insert the pump case 1 into the yoke 1.
3 to wrap and tighten.

In use, when the coil 4 is connected to an external power source and the coil 4 is energized, the magnetic field around the coil 4 changes and the impeller 9 having the magnet portion 11 rotates at high speed. As a result, the fluid introduced into the pump case 1 from the suction pipe 7 is accelerated and pressurized in the tangential direction of the impeller 9 by the vanes 10 of the impeller 9, and is discharged from the discharge pipe 8.

Next, a second embodiment shown in FIG. 2 will be described.

This embodiment is similar to the yoke 13 in the first embodiment.
Instead, this is an example in which a first yoke 16 and a second yoke 17 are engaged with each other at side wall portions extending from the upper and lower surfaces of the pump case to the side surfaces of the pump case.

Engagement hooks 20 and 21 are formed in the divided portions 18 and 19 provided on the side wall portions of the first and second yokes 16 and 17, respectively, and when assembled, the interior has a space approximately the same shape as the pump case 1. yoke 1
It becomes 5.

Note that the divided portion 19 of the second yoke 17 is provided with notches 22 and 23 for allowing the suction pipe 7 and the discharge pipe 8 to come out of the yoke 15.

Therefore, during assembly, the pump case 1 is dropped into the second yoke 17 so that the suction pipe 7 and the discharge pipe 8 project outward from the notch 22 and 23 of the second yoke 17, respectively. After that, the first
After the yoke 16 is overturned, the pump case 1 is rotated counterclockwise while being pressed to engage the engagement hook 20 of the first yoke 16 and the engagement hook 21 of the second yoke 17 to form the yoke 15. do. Thereby, the pump case 1 is fastened so as to be wrapped around the yoke 15 with its upper and lower surfaces in close contact with the yoke 15.

Next, a third embodiment shown in FIG. 3 will be described.

This embodiment has a bottomed cylindrical first part which has a space approximately the same shape as the pump case 1 inside, is open at the top, and has a cylindrical part extending so as to cover the entire side surface of the pump case. yoke 25 and the first
This is an example using a yoke 24 that is a combination of a yoke and a disk-shaped second yoke 26 that is screwed together.

Note that the first yoke 25 has a notch 27 on the outer periphery for letting the suction pipe 7 and the discharge pipe 8 out of the yoke 24.
28 are provided. Further, a thread 30 is provided on the upper inner circumference of the first yoke 25 so as to be threadedly engaged with a thread 29 provided on the outer circumference of the second yoke 26 .

Therefore, during assembly, the pump case 1 is dropped into the first yoke 25 so that the suction pipe 7 and the discharge pipe 8 project outward from the cutout 27 and the cutout 28, respectively. After that, the second
The yoke 26 is rotated and screwed onto the first yoke 25 so that the thread 29 is screwed onto the thread 30 of the first yoke 25, and the peripheral parts of these yokes are joined in a wide range over the entire circumference. There is.

At this time, the pump case 1 is wrapped and fastened by the integrally screwed yoke 24, with its upper and lower surfaces 5 and 6 in close contact with the yoke.

Regarding the second and third embodiments, other configurations are the same as those in the first embodiment, so the same components are given the same reference numerals and explanations will be omitted.

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and the present invention may be modified without departing from the gist of the present invention. included.

For example, since the material of the yoke is made of metal in the embodiment, it may be made of synthetic resin containing ferromagnetic material as long as it has sufficient strength.

Further, the engaging hooks shown in the second embodiment may have other shapes, and the engaging force is increased by tapering the engaging surfaces of the engaging hooks.

(Effects of the invention) As described above, in the brushless cascade pump of the invention, the impeller rotates and the pump This has the effect of suppressing deformation of the pump case when the pressure inside the case becomes high.

Due to this effect, the clearance between the inner surface of the pump case and the impeller does not increase beyond an allowable range, and pump efficiency does not decrease. Also,
The gap between the coil embedded in the pump case and the magnet provided in the impeller does not become large, and the rotational efficiency of rotating the impeller does not decrease.

In addition, the number of parts is reduced because the pump case is held between the yoke by press-fitting the pump case, engaging the yoke, and screwing the yoke, rather than using a large number of screws to hold the pump case between the yoke. and installation man-hours can be reduced. Furthermore, it is not necessary to consider the elongation of the screws that occurs when screws are fastened, and there is no need for a troublesome process such as tightening a large number of screws with equal force, so that reliable fastening can be performed.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a brushless cascade pump according to the first embodiment of the present invention, and Fig. 2 is a perspective view showing the brushless cascade pump according to the first embodiment of the present invention.
FIG. 3 is a perspective view showing a brushless cascade pump according to a third embodiment of the present invention, and FIG. 4 is a perspective view showing a conventional brushless cascade pump. 1... Pump case, 2... First pump case, 3... Second pump case, 4... Coil, 5
...Pump case top surface, 6...Pump case bottom surface, 9...Impeller, 11...Magnet part (magnet), 13...Yoke, 15...Yoke,
24...York.

Claims (1)

[Claims for Utility Model Registration]
A pump case 1 consisting of a pump case 2 and a second pump case 3 and provided with a suction pipe 7 and a discharge pipe 8; an impeller 9 rotatably provided inside the pump case 1; It comprises: a buried coil 4; a magnet 11 provided on the impeller 9 at a position opposite to the coil 4; and yokes 13, 15, 24 closely surrounding the upper and lower surfaces and side surfaces of the pump case 1. A brushless cascade pump that is characterized by: