KR101939282B1 - FREE-END PLAY-FREE type BLDC pump - Google Patents

Abstract

The present invention relates to a brushless direct current pump (BLDC) pump, and more particularly to a free-end play free type BLDC pump that eliminates restriction members provided at opposite ends of a non-rotary shaft to restrict a range in which a rotor-impeller coupling body moves along the shaft and nevertheless prevents damage and noise due to an impact. A free-end play free type BLDC pump according to the present invention includes: a pumping housing having an inlet and an outlet; a motor housing coupled to a lower side of the pumping housing; a stator disposed in the interior of the motor housing; a rotor disposed inside the stator to be rotated; an impeller provided on the upper side of the rotor to be rotated together and disposed in the interior of the pumping housing; and a shaft passing through the rotor and the impeller and configured to guide rotation of the rotor and the impeller, and an electromagnetic force applied to the rotor by the stator offsets a buoyancy of the impeller toward the lower side.

Description

Free-end PLAY-FREE type BLDC pump {FREE-END PLAY-FREE type BLDC pump}

[0001] The present invention relates to a brushless direct current pump (BLDC) pump, and more particularly to a brushless direct current pump which is provided at both ends of a non-rotating shaft to remove a limiting member that limits the range in which [rotor- Free play type BLDC pump that prevents damage and noise due to impact.

Among BLDC pumps (Brushless Direct Current Pump), BLDC pump with non-rotating shaft structure that does not rotate shaft is widely used because of its simple structure and low cost.

1 shows a BLDC pump of a non-rotating shaft structure according to Japanese Patent Application Laid-Open No. 10-2016-0135541 entitled " Plastic-shell BLDC motor pump with non-rotating shaft structure, strengthening torque resistance and forming ball root of shaft and rotor impeller " It is.

1, a BLDC pump of a non-rotating shaft structure includes a pumping housing 910, a motor housing 920, a stator 960, a rotor 1010, an impeller 1020, and a shaft 1330.

The shaft 1330 penetrates through the rotor 1010 and the impeller 1020 and is coupled at its both ends to be fixed to the pumping housing 910 and the motor housing 920 so that the shaft 1330 does not rotate, And the impeller 1020 (hereinafter, referred to as " rotor-impeller joined body ").

Buoyancy is generated in the process of the impeller 1020 rotating and pumping water. The rotor-impeller assembly moves up and down along the shaft 1330 and the impeller 1020 ascending and descending is hit by the upper side of the inner surface of the pumping housing 910 to be damaged and the impeller 1020 is pumped The [rotor-impeller combined body] is lowered by the repulsive force and the [rotor-impeller combined body] which is lowered is hit by the inner surface of the motor housing 920 to be damaged.

Thus, the rotor-impeller coupling body is closed at the outer circumferences of both sides of the shaft 1330 to prevent the rotor-impeller coupling body from bumping against the inner surfaces of the pumping housing 910 and the motor housing 920, The restriction members 1331 and 1333 are provided.

A trust journal, a washer, a bushing, an O-ring, or the like is used as the limiting members 1331 and 1333 for limiting the rising and falling range of the [rotor-impeller combined body].

The rotor-impeller combined body is prevented from being damaged by the impact against the pumping housing 910 and the motor housing 920 due to the limiting members 1331 and 1333, but buoyancy due to the rotation of the impeller 1020 is continued The rotor-impeller assembly moves up and down along the shaft 1330, hits the upper limiting member 1331, and is lowered by the repulsion due to the impact, so that an operation of bumping against the lower limiting member 1333 is generated.

Therefore, the BLDC pump of the non-rotating shaft structure has a problem in that a noise is generated due to an impact caused by the [rotor-impeller combined body] bumping against both side limiting members 1333 of the shaft 1330.

The present invention has been conceived to solve the problem of generating noises in a BLDC pump having a non-rotating shaft structure. The present invention prevents the rotor-impeller assembly from being damaged by being raised and lowered against the inner surface of the pumping housing, Free PLD-FREE type BLDC pump in which the [rotor-impeller combined body] removes the limiting member of the free-end play-free type so as to prevent the noise that hits the limiting member from being generated.

To achieve the above object, the FREE-END PLAY-FREE type BLDC pump according to the present invention includes:

A pumping housing having an inlet and an outlet;

A motor housing coupled to a lower portion of the pumping housing;

A stator disposed within the motor housing;

A rotor disposed inside the stator and rotating;

An impeller provided on the rotor and rotated together and disposed inside the pumping housing;

And a shaft penetrating the rotor and the impeller and guiding the rotation of the rotor and the impeller,

And the electromagnetic force acting on the rotor of the stator is directed downward to cancel buoyancy of the impeller.

The FREE-END PLAY-FREE type BLDC pump according to the present invention having the above-

The electromagnetic force of the stator for rotating the rotor acts in the downward direction to cancel the buoyancy due to the rotation of the impeller acting in the upward direction,

The [rotor-impeller combined body] is stably rotated in place, thereby preventing an accident that the [rotor-impeller combined body] is lifted or lowered to be damaged by an impact against the pumping housing or the motor housing,

The rotor-impeller combined body is not provided with a limiting member for limiting the range of rise and fall of the [rotor-impeller combined body], so that no noise due to the impact that the rotor-

The structure of BLDC pump is simpler, the FREE-END PLAY-FREE type BLDC pump with reduced manufacturing cost and improved productivity is very useful for industrial power generation.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional BLDC pump with a non-rotating shaft structure; FIG.
2 is a perspective view of a FREE-END PLAY-FREE type BLDC pump according to an embodiment of the present invention;
3 is a sectional view of Fig. 2;
Fig. 4 is an exploded perspective view of Fig. 2; Fig.

Hereinafter, a FREE-END PLAY-FREE type BLDC pump according to the present invention will be described in detail with reference to the drawings.

Before describing the FREE-END PLAY-FREE type BLDC pump according to the present invention in more detail,

While the present invention has been described in connection with certain embodiments, it is obvious that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

In the drawings, the same reference numerals are used for the same reference numerals, and in particular, the numerals of the tens and the digits of the digits, the digits of the tens, the digits of the digits and the alphabets are the same, Members referred to by reference numerals can be identified as members corresponding to these standards.

In the drawings, the components are expressed by exaggeratingly larger (or thicker) or smaller (or thinner) in size or thickness in consideration of the convenience of understanding, etc. However, It should not be.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the term " comprising " or " consisting of ", or the like, refers to the presence of a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

As shown in the drawing, the FREE-END PLAY-FREE type BLDC pump according to the present invention includes a pumping housing 10, a motor housing 20, a stator 30, a rotor 40, an impeller 50, a shaft 60 ).

For reference, the components of the BLDC pump according to the present invention will be described with reference to the drawings.

The pumping housing 10 has an inlet 11 through which the fluid flows into the upper center and an outlet 13 through which the fluid introduced into the side flows out.

The motor housing 20 is coupled to the lower portion of the pumping housing 10.

The upper surface of the motor housing 20 is formed with a packing groove 21 on which a packing P for sealing a gap between the pump housing 10 and the pump housing 10 is sealed.

At the center of the upper surface of the motor housing 20, an isolator 23 is embedded in which the rotor 40 is inserted.

The isolation tube 23 is disposed inside the motor housing 20 in which the stator 30 is mounted and the inside of the isolation tube 23 in which the rotor 40 is inserted and connected to the pumping housing 10, So that the fluid introduced into the pumping housing 10 penetrates into the interior of the motor housing 20 and basically blocks the contact with the stator 30.

A fixed blade 25 for fixing the BLDC pump to a structure or the like is formed on the outer peripheral edge of the upper side of the motor housing 20.

A cover (27) is coupled to the lower opening of the motor housing (20).

The stator (30) is fixedly mounted inside the motor housing (20).

The stator 30 includes a core 31 and a coil (not shown) wound around the core.

When power is applied to the coil, an electromagnetic force for rotating the rotor 40 is generated.

The electromagnetic force generated by the stator 30 and applied to the rotor 40 acts toward the lower direction. The direction of the action of the electromagnetic force can be controlled by winding the coil around the core.

Here, 'downward' in the direction of the action of the electromagnetic force means that the electromagnetic force acts not only in the horizontal direction but also in the downward direction. In other words, in general, the electromagnetic force of the stator 30 acts in the horizontal direction. In the present invention, the electromagnetic force of the stator 30 acts in the oblique direction toward the bottom, and the electromagnetic force in the oblique direction is disassembled in the horizontal direction and the downward direction .

The downward force of the electromagnetic force applied to the rotor 40 by the stator 30 is designed to have a magnitude corresponding to the buoyancy generated by the rotation of the impeller 50. Thus, the electromagnetic force in the lower direction and the buoyancy in the upper direction are canceled each other so that the rotor-impeller assembly can be rotated in place without being lifted or lowered.

The rotor-impeller combined body can be rotated in place by the offset of the electromagnetic force and the buoyancy, so that it is coupled to the upper side and the lower side of the shaft 60 to limit the rising and falling range of the [rotor- A restricting member such as a trust journal, a bushing, a washer, and an O-ring can be removed.

That is, the limiting member can be removed from both ends (END PLAY) of the shaft 60 penetrating the [rotor-impeller combined body], so that the present invention can be applied to a free-end play- Named.

The impeller 50 is disposed inside the pumping housing 10 and rotates to push the fluid flowing into the inlet 11 of the pumping housing 10 to the edge to pumped out through the outlet 13 do.

The impeller 50 is integrally formed on the upper side of the penetrating member 70 through which the shaft 60 penetrates.

An extension portion 71 is formed on an outer periphery of the penetrating member 70 on the lower side of the impeller 50 to support and support the upper and lower surfaces of the rotor 40, respectively.

The rotor (40) is a permanent magnet coupled to the lower side of the penetrating member (70) and has a cylindrical structure. The permanent magnets of the rotor 40 may have various polarities such as four poles, six poles, eight poles, and the like, in which the polarities of the permanent magnets are changed several times in the circumferential direction.

The shaft 60 passes through the penetration member 70 constituting the rotor-impeller assembly and both ends thereof are coupled to the pumping housing 10 and the motor housing 20, respectively.

The upper end of the shaft 60 is fixedly coupled to a mounting block 15 disposed at the center of the inlet 11 of the pumping housing 10. A cap 61 of a rubber material such as natural rubber, synthetic rubber or silicone is coupled to the lower end of the shaft 60 and the cap 61 is formed on the bottom of the isolation tube 23 of the motor housing 20 And is fitted into the mounting groove in an interference fit manner. The rubber cap 61 absorbs the impact transmitted to the shaft 60 by the rotation of the [rotor-impeller coupling body], thereby relieving the shock.

While the present invention has been described with reference to the accompanying drawings, a FREE-END PLAY-FREE type BLDC pump having a specific shape and structure has been described. However, the present invention can be variously modified and changed by those skilled in the art, And variations are to be construed as falling within the scope of protection of the present invention.

10: pumping housing 11: inlet
13: outlet 15: mounting block
20: motor housing 21: packing groove
23: Isolator 27: Cover
30: stator 31: core
40: rotor 50: impeller
60: shaft 70: penetrating member

Claims (1)

A pumping housing having an inlet and an outlet;
A motor housing coupled to a lower portion of the pumping housing;
A stator disposed within the motor housing;
A rotor disposed inside the stator and rotating;
An impeller provided on the rotor and rotated together and disposed inside the pumping housing;
And a shaft penetrating the rotor and the impeller and guiding the rotation of the rotor and the impeller,
And the electromagnetic force acting on the rotor of the stator is directed downward to cancel the buoyancy of the impeller, whereby the FREE-END PLAY-FREE type BLDC pump.

Images