JPS6244155Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention provides a pump device for pumping liquid, in particular, a rotary pump and a pump drive device in a casing consisting of a bottomed cylindrical casing body and a cover attached to the open end of the casing body. The present invention relates to a pump device for pumping liquid of a type that accommodates a motor.

Conventionally, such pump devices for pumping liquid have a structure in which the internal space of the casing is completely immersed in the liquid to be pressurized, so stagnation of the liquid to be pressurized occurs in various places in the internal space, which makes it difficult to operate the pump. There is a problem in that sometimes bubbles tend to form in the pressurized liquid that stagnates in the stagnation portion, and the pump efficiency decreases due to the bubbles. In addition, in the conventional structure described above, not only the rotary pump but also the entire motor is immersed in the liquid to be pumped.
Another problem is that maintenance of the motor is not easy.

The purpose of the present invention is to provide a liquid pressure pump device that can solve all the problems of the conventional devices described above, and its features include a bottomed cylindrical casing body and a cover attached to the open end of the casing body. This is a pump device for pumping liquid, which houses a rotary pump and a brushless motor for driving the pump in a casing, and the opening end of a bottomed cylindrical partition plate is fixed to the bottom of the casing body, and the opening end of a cylindrical partition plate is fixed to the bottom of the casing body. is liquid-tightly partitioned by the partition plate into a liquid immersion chamber inside the liquid immersion chamber and a liquid non-immersion chamber outside the liquid immersion chamber, and the rotary pump and the rotor of the brushless motor are disposed in the liquid immersion chamber. , a ring-shaped permanent magnet is fitted on the outer periphery of the rotor, and an outer rotor of a rotary pump is fitted on the inner periphery of the rotor, and the outer periphery of the permanent magnet is surrounded by a partition plate in the liquid non-immersion chamber. , a stator of a brushless motor, a coil attached to the stator and cooperating with the permanent magnet, and a drive circuit for controlling the operation of the coil are provided.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In FIGS. 1 to 3, the casing C of the pump device 1 is composed of a casing body 5 and a cover 31 attached to the open end of the casing body 5.
Components including a rotary pump 2 and a brushless motor 3 as a drive motor are housed inside.

The rotary pump 2 includes an inner rotor 6 rotatably supported by a support shaft 4 of a casing body 5 having a support shaft 4, and an outer rotor 7 meshing with the inner rotor 6. The casing body 5 is basically formed into a cylindrical shape with a bottom, and a cylindrical support shaft 4 having an insertion hole 8 is protruded from the center of the bottom, and an annular stepped portion is provided in the middle of the support shaft 4. 9 is formed. An inner rotor 6 is rotatably fitted onto the outer periphery of the support shaft 4 while being supported by the annular stepped portion 9 . External teeth 10 are formed on the outer periphery of this inner rotor 6. Further, the outer rotor 7 is rotatably supported by the annular stepped portion 9 so as to surround the inner rotor 6, and on the inner periphery of the outer rotor 7, which is eccentric with respect to the support shaft 4, there is an inner rotor that meshes with the outer teeth 10 of the inner rotor 6. Teeth 11 are formed, and a pump chamber 12 is formed between the inner rotor 6 and the outer rotor 7.

The casing body 5 is provided with a suction passage 13 and a discharge passage 14 which can communicate with the pump chamber 12 at positions shifted in the circumferential direction.
A check valve 15 for preventing backflow from the pump chamber 12 is provided in the middle of the discharge path 14, and a check valve 16 for preventing backflow to the pump chamber 12 is provided in the middle of the discharge path 14. A suction pipe section 17 and a discharge pipe section 18 are communicated with the suction passage 13 and the discharge passage 14, respectively, and the suction pipe part 17 and the discharge pipe part 18 communicate with the suction pipe part 13 and the discharge pipe part 14, respectively. are connected to each other via a connecting passage 20 provided with a relief valve 19 that allows only the flow of water.

The brushless motor 3 includes a rotor 22 fixed to the outer rotor 7 and has a ring-shaped permanent magnet 21 surrounding the outer rotor 7 concentrically with the support shaft 4.
A plurality of phase (two-phase, four-pole in this embodiment) coils 23 are arranged concentrically surrounding the rotor 22 and spaced at equal intervals in the circumferential direction.
A drive circuit 25 that distributes a drive current to each coil 23, and a partition plate 26 that isolates the rotor 22 and the stator 24 from each other.

The rotor 22 is basically formed in a cylindrical shape with a bottom, and is disposed so as to cover the outer rotor 7 from the free end side of the support shaft 4, and is connected to the outer rotor 7 and the rotor 22.
It is fitted integrally with the inner peripheral part. This rotor 22
A rotating shaft 27 is integrally fixed to the center of the shaft, and this rotating shaft 27 is inserted into the insertion hole 8 of the support shaft 4, and is supported by a bearing plate 28 at the bottom of the insertion hole 8. . Furthermore, a ring-shaped permanent magnet 21 is fitted onto the outer peripheral surface of the rotor 22.

The partition plate 26 is basically formed in a cylindrical shape with a bottom to cover the rotor 26, and is fixed to the bottom of the casing body 5 via a sealing member 29. The inner rotor 6 and outer rotor 7 of the rotary pump 2 and the rotor 22 are housed in a liquid immersion chamber 30 formed inside. Further, a liquid non-immersion chamber 32 is formed between the partition plate 26 and the cover 31, that is, on the open end side of the casing body 5, and both chambers 30,
32 is isolated in a liquid-tight manner.

The stator 2 is placed in the liquid non-immersion chamber 32 as described later.
A disk-shaped substrate 34 fixed and supported by an end of a support rod 35 attached to the substrate 4 is arranged at a distance from the partition plate 26, and a drive circuit 25 is provided on the partition plate 26 side of the substrate 34. This drive circuit 25 includes means for detecting the magnetic position of the permanent magnet 21, such as a Hall element (not shown), and has a function of exciting each coil 23 according to the magnetic pole position thereof.

A cover 31 is attached to the open end of the casing body 5 to cover the substrate 34 and the drive circuit 25, and the drive circuit 2 as a current-carrying component is placed in a liquid non-immersion chamber 32 defined by the cover 31 and the partition plate 26.
5. The coil 23 and stator 24 will be housed. Thereby, it is possible to prevent electrical leakage caused by moisture in liquid such as fuel oil.

The board 34 has a plurality of them at equal intervals in the circumferential direction (four shown).
A support rod 35 is fixed at the position , and each support rod 35 is supported by a ring-shaped stator 24 .
The support rods 35 are arranged so as to surround the permanent magnets 21 of the rotor 22 with the partition plate 26 in between, and the coils 23 are arranged at a plurality of positions (four positions) between each support rod 35. Wrapped at equal intervals.

Here, to explain in detail the mounting structure of the cover 31 to the casing body 5, the liquid non-immersion chamber 32 on the open end side of the casing body 5 is separated from the liquid immersion chamber 30 in a liquid-tight manner by the partition member 26. , a seal structure is not required, and a seal-less mounting structure can be used. That is, on the outer periphery of the open end of the casing body 5, there is a groove that protrudes outward in the radial direction.
A plurality of protrusions 36, for example, four, are provided protrudingly, and the cover 31 has four protrusions 36 that sandwich the protrusions 36, respectively.
Two holding parts 37 are integrally provided. Each of the holding parts 37 protrudes from the opening edge of the cover 31 toward the casing main body 5, and is bifurcated into two parts that approach each other toward the free end thereof. Therefore, when each protrusion 36 is sandwiched, each clamping portion 37 elastically clamps the corresponding protrusion 36, thereby attaching the cover 31 to the open end of the casing body 5.

Next, the operation of this embodiment will be explained. By sequentially exciting each coil 23 in the circumferential direction by the drive circuit 25, a rotational force is applied to the rotor 22, and the rotor 22 and the outer rotor 7 are integrated. The rotary pump 2 performs a pumping operation by rotating the pump. As a result, liquid such as fuel is sucked into the pump chamber 12 from the suction pipe section 17 and continuously discharged from the discharge pipe section 18.

In such a pump device 1, since the rotary pump 2 is arranged so as to be surrounded by the brushless motor 3, the thickness of the pump device 1 along the axis of the support shaft 4 can be made as thin as possible to reduce the size. becomes possible. Furthermore, since the diameter of the rotor 22 is set larger than the diameter of the outer rotor 7, the operating torque for the outer rotor 7 is large, and both the discharge flow rate and the discharge pressure must be set larger than the size of the rotary pump 2. becomes possible. Also, since the rotary pump 2 is driven by a brushless motor 3,
It is possible to prevent torque down, deterioration of durability, and adverse effects on electrical equipment due to sparks that occur when using conventional brushless motors.

The device of the present invention can be widely used not only as a fuel pump for automobiles and motorcycles, but also as a pump for pumping other liquids.

As described above, according to the present invention, the rotary pump 2 and the brushless motor 3 for driving the pump are housed in the casing C, which is composed of the bottomed cylindrical casing body 5 and the cover 31 attached to the open end of the casing body 5. This is a pump device for pumping liquid containing a casing C, in which the open end of a bottomed cylindrical partition plate 26 is fixed to the bottom of the casing body 5, and the liquid inside the casing C is controlled by the partition plate 26. It is liquid-tightly divided into an immersion chamber 30 and a liquid non-immersion chamber 32 outside the immersion chamber 30, and the rotary pump 2 and the rotor 22 of the brushless motor 3 are disposed in the liquid immersion chamber 30, and
A ring-shaped permanent magnet 21 is attached to the outer periphery of the rotor 22.
and the outer rotor 7 of the rotary pump 2 is fitted onto the inner periphery thereof, and a brushless motor 3 is fixed in the liquid non-immersion chamber 32, surrounding the outer periphery of the permanent magnet 21 via a partition plate 26. child 24
The permanent magnet 2 is attached to this stator 24.
1 and a drive circuit 25 that controls the operation of the coil 23, a space that becomes a stagnation area for the liquid to be pumped in the casing C is created in the liquid non-immersion chamber 32. The presence of the stagnation liquid makes it possible to reduce the amount of stagnation of the pressurized liquid in the casing C during pump operation, thereby suppressing the amount of bubbles generated from the stagnation liquid and improving pump efficiency. Moreover, since the liquid non-immersion chamber 32 can be widely opened to the outside simply by separating the cover 31 from the casing body 5, maintenance of the electrical components such as the coil 23 and the drive circuit 25 in the chamber 32 is extremely easy.

Further, since the rotary pump 2 is arranged so that its outer periphery is surrounded by the brushless motor 3, the pump device can be downsized in its axial direction, and the motor 3 is smaller than the outer rotor 7 of the pump 2. Since the rotor 22 is formed to have a large diameter and the two rotors 7 and 22 are directly connected, the driving torque to the outer rotor 7 becomes large, which can contribute to increasing the output of the pump. Furthermore, since the rotor 22 of the motor 3 is also used as a connection support member for the outer rotor 7 of the pump 2, the structure is simpler and can contribute to cost reduction.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a front view, FIG. 2 is a vertical sectional view thereof, and FIG. 3 is a sectional view taken along the line -- in FIG. 2. C...Casing, 1...Pump device, 2...
Rotary pump, 3... Brushless motor, 5... Casing body, 7... Outer rotor, 21... Permanent magnet, 22... Rotor, 23... Coil, 24
... Stator, 25 ... Drive circuit, 26 ... Partition plate, 30 ... Liquid immersion chamber, 31 ... Cover, 32
...Liquid non-immersion chamber.

Claims (1)

[Scope of utility model registration request] A pump device for pumping liquid in which a rotary pump 2 and a brushless motor 3 for driving the pump are housed in a casing C composed of a bottomed cylindrical casing body 5 and a cover 31 attached to the open end of the casing body 5. Then, the open end of a bottomed cylindrical partition plate 26 is fixed to the bottom of the casing body 5, and the inside of the casing C is separated from the liquid immersion chamber 30 inside the liquid immersion chamber 30 and the liquid non-immersion chamber 30 outside the casing C by the partition plate 26. The rotary pump 2 and the rotor 22 of the brushless motor 3 are arranged in the liquid immersion chamber 30, and a ring-shaped permanent magnet 21 is arranged around the outer periphery of the rotor 22. In addition, there is a rotary pump 2 on the inner circumference.
A brushless motor 3 is fitted into the liquid non-immersion chamber 32 and surrounds the outer periphery of the permanent magnet 21 via a partition plate 26.
A liquid pumping system characterized in that a stator 24, a coil 23 attached to the stator 24 and cooperating with the permanent magnet 21, and a drive circuit 25 for controlling the operation of the coil 23 are disposed. pump equipment.