WO2019112156A1

WO2019112156A1 - Pump for circulating water

Info

Publication number: WO2019112156A1
Application number: PCT/KR2018/011570
Authority: WO
Inventors: Jeong Cheol Jang; Kyoung Joo Lee; Min Seok Kang
Original assignee: New Motech Co., Ltd.
Priority date: 2017-12-06
Filing date: 2018-09-28
Publication date: 2019-06-13
Also published as: KR101995436B1; KR20190066681A

Abstract

The pump for circulating water according to the present invention comprises an upper housing (10) having an inlet (11) and an outlet (12) of fluid; a lower housing (20) coupled with the upper housing (10), having a stator (70) installed therein; an inner housing (30) installed inside the lower housing (20); an impeller (50) arranged to form a flow pathway (40), a space formed between the impeller and the inside lower surface of the inner housing (30); and a rotor (60) installed in the impeller (50), wherein the impeller (50) has a cavity (52) formed therein in a longitudinal direction, wherein a plurality of lower holes (57B) are formed under the cavity (52), and a plurality of long holes (52A) are formed in the side surface of the cavity (52), such that fluid collected in the flow pathway (40) is introduced in the cavity (52) through the lower holes (57B) and discharged to the outlet (12) through the long holes (52A).

Description

PUMP FOR CIRCULATING WATER

The present invention relates to a pump for circulating water. More specifically, the present invention relates to a pump for circulating water which is capable of reducing noise through stable operation of an impeller by effectively removing bubbles occurring inside the pump and effectively discharging fluid in the lower portion of the impeller.

In general, low pressure boilers or heating mats, etc., are provided with pumps for circulating water for circulating heated water. The principle of a motor is applied to a pump for circulating water; an impeller comprising a rotor rotates by electromagnetic interaction with a stator and discharges water introduced through an inlet to an outlet.

Such pump for circulating water is disclosed in prior art, Korean Patent No. 10-1204344. This patent document discloses that water introduced through an inlet in the upper portion of the pump for circulating water is discharged to an outlet on the side surface by rotation of an impeller. Water introduced into a space between the lower portion of the impeller and an inner housing moves upwardly through a flow pathway vertically formed through the impeller thereinside and is mixed inside impeller wings with water introduced from the upper portion to be discharged to the outlet. Such discharge hole ensures stable rotation of the impeller and prevents the rise of the impeller.

However, according to the prior art, fluid rising through the discharge hole collides inside the impeller with fluid introduced from the upper portion, which may result in unstable rotation of the impeller. Further, air introduced in the discharge hole causes unpleasant noise which is similar to the noise generated when water runs down the drain. The pump for circulating water is used for heating mats, and the unpleasant noise generated while sleeping disturbs comfortable sleep and degrades the quality of heating mats.

In addition, according to the prior art, the proceeding direction of fluid introduced from a shaft support part and the inside of the impeller is changed at the side of the inlet. Bubbles occur in the space in which the direction of fluid is changed, and cause noise.

In order to solve these problems, the present inventors are to provide a pump for circulating water of a new structure which is capable of allowing a smoother flow of air and fluid inside an impeller and preventing generation of bubbles in a space in which the direction of introduced fluid is changed.

It is an object of the present invention to provide a pump for circulating water which is capable of ensuring stable rotation of an impeller and preventing noise by allowing fluid and air pressure occurring in a space inside the impeller to be effectively discharged.

It is another object of the present invention to provide a pump for circulating water which is capable of preventing generation of bubbles in a space in which the direction of introduced fluid is changed.

The above object of the present invention or other inherent objects could all be easily achieved by the present invention explained in the following.

A pump for circulating water according to the present invention comprises an upper housing 10 having an inlet 11 and an outlet 12 of fluid; a lower housing 20 coupled with the upper housing 10, having a stator 70 installed therein; an inner housing 30 installed inside the lower housing 20; an impeller 50 arranged to form a flow pathway 40, a space formed between the impeller and the inside lower surface of the inner housing 30; and a rotor 60 installed in the impeller 50, wherein the impeller 50 has a cavity 52 formed therein in a longitudinal direction, wherein a plurality of lower holes 57B are formed under the cavity 52, and a plurality of long holes 52A are formed in the side surface of the cavity 52, such that fluid collected in the flow pathway 40 is introduced in the cavity 52 through the lower holes 57B and discharged to the outlet 12 through the long holes 52A.

In the present invention, preferably, the inside of the inlet 11 is partitioned by a plurality of partitions 11A, and one of the plurality of partitions has an auxiliary partition 11D downwardly extending.

In the present invention, preferably, the auxiliary partition 11D has an auxiliary partition protrusion 11E inwardly protruding, formed at the center of the inside of the auxiliary partition 11D in a longitudinal direction.

A pump for circulating water according to the present invention comprises an upper housing 10 having an inlet 11 and an outlet 12 of fluid; a lower housing 20 coupled with the upper housing 10, having a stator 70 installed therein; an impeller 50 arranged to form a flow pathway 40, a space formed between the impeller and the inside lower surface of the lower housing 20; and a rotor 60 installed in the impeller 50, wherein the impeller 50 has a cavity 52 formed therein in a longitudinal direction, wherein a plurality of lower holes 57B are formed under the cavity 52, and a plurality of long holes 52A are formed in the side surface of the cavity 52, such that fluid collected in the flow pathway 40 is introduced in the cavity 52 through the lower holes 57B and discharged to the outlet 12 through the long holes 52A.

A pump for circulating water according to the present invention comprises an upper housing 10 having an inlet 11 and an outlet 12 of fluid; a lower housing 20 coupled with the upper housing 10, having a stator 70 installed therein; an inner housing 30 installed inside the lower housing 20; an impeller 50 arranged to form a flow pathway 40, a space formed between the impeller and the inside lower surface of the inner housing 30; and a rotor 60 installed in the impeller 50, wherein the inside of the inlet 11 is partitioned by a plurality of partitions 11A, and one of the plurality of partitions has an auxiliary partition 11D downwardly extending.

A pump for circulating water according to the present invention comprises an upper housing 10 having an inlet 11 and an outlet 12 of fluid; a lower housing 20 coupled with the upper housing 10, having a stator 70 installed therein; an impeller 50 arranged to form a flow pathway 40, a space formed between the impeller and the inside lower surface of the lower housing 20; and a rotor 60 installed in the impeller 50, wherein the inside of the inlet 11 is partitioned by a plurality of partitions 11A, and one of the plurality of partitions has an auxiliary partition 11D downwardly extending.

The present invention can ensure stable rotation of an impeller and prevent noise by allowing fluid and air pressure occurring in a space inside the impeller to be effectively discharged. Also, the present invention can prevent generation of bubbles in a space in which the direction of introduced fluid is changed, by applying a new structure to the portion in which fluid is introduced.

Fig. 1 is a perspective view illustrating a pump for circulating water according to the present invention;

Fig. 2 is an exploded perspective view illustrating the pump for circulating water according to the present invention;

Fig. 3 is a top perspective view illustrating an impeller of the pump for circulating water according to the present invention;

Fig. 4 is a bottom perspective view illustrating the impeller of the pump for circulating water according to the present invention;

Fig. 5 is an exploded perspective view illustrating the impeller of Fig. 4 with an impeller lower cover separated;

Fig. 6 is a perspective view illustrating the impeller lower cover of the present invention;

Fig. 7 is a cross-sectional view illustrating the pump for circulating water according to the present invention;

Fig. 8 is a bottom view illustrating an upper housing of the pump for circulating water according to the present invention; and

Fig. 9 is a perspective view illustrating the upper housing of the pump for circulating water according to the present invention.

Hereinafter, the present invention will be explained in more detail with reference to the accompanied drawings.

Fig. 1 is a perspective view illustrating a pump for circulating water 100 according to the present invention. Fig. 2 is an exploded perspective view illustrating the pump for circulating water 100 according to the present invention.

Referring to Fig. 1 and Fig. 2, the pump for circulating water according to the present invention comprises an upper housing 10, a lower housing 20, an inner housing 30, a flow pathway 40, an impeller 50, a rotor 60, a stator 70, a printed circuit board 80 and a connector 90.

The upper housing 10 is coupled to the upper portion of the lower housing 20 or the inner housing 30, and has an inlet 11 through which fluid is introduced formed in the center.

The fluid introduced through the inlet 11 is discharged through an outlet 12 by operation of the impeller 50. The fluid introduced through the inlet 11 passes through a plurality of partitions 11A which are installed symmetrically inside the inlet 11 to partition the space in the inlet 11, and is introduced into the impeller 50.

The lower housing 20 has the stator 70 installed therein. The stator 70 comprises a core 71 and upper and

lower insulators

72, 73 coupled to the upper and lower portions of the core 71, respectively. The stator 70 around which coil (not illustrated) is wound is electrically connected to the printed circuit board 80. External power is supplied to the printed circuit board 80 through the power connector 90. Preferably, the lower housing 20 of the present invention is made of a plastic resin by an insert injection molding method by placing the stator 70 and the printed circuit board 80 in the insertion mold.

The inner housing 30 is coupled between the upper housing 10 and the lower housing 20. The inner housing 30 has an impeller receiving part 31 inside which the impeller 50 is received formed therein. In the present invention, the lower housing 20 may perform the function of the inner housing 30 according to design needs. That is, the inner housing 30 may not be provided, and the impeller 50 may be arranged in the lower housing 20.

The flow pathway 40 denotes a space between the lower surface of the impeller 50 and the inside lower surface of the inner housing 30. In the case where the inner housing 30 is not provided, the flow pathway 40 denotes a space between the lower surface of the impeller 50 and the inside lower surface of the lower housing 20. Upon operation of the pump for circulating water 100, water or air is introduced in the flow pathway 40. The increase in fluid inflow causes the rise of the impeller due to pressure, which may result in malfunction of the pump or generation of noise. In order to solve these problems, the present invention has a structure of effectively discharging the fluid in the flow pathway 40. The structure will be explained below.

The impeller 50 is arranged in the lower housing 20 or in the impeller receiving part 31 of the inner housing 30 and at the same time inside the stator 70. The impeller 50 comprises an impeller body 51 inside which the rotor 60 is received and a circular base plate 54 with a plurality of wing pieces 53. A rotation shaft 55 is positioned in the center of the impeller 50. A shaft support member 51C coupled to the center of the impeller 50 is rotatably coupled around the rotation shaft 55. An impeller intermediate body 51D denotes a portion between the impeller body 51 and the base plate 54. An impeller upper cover 56 is coupled to the upper portions of the plurality of wing pieces 53, and an impeller lower cover 57 is coupled to the lower portion of the impeller body 51.

The impeller upper cover 56 has a plurality of coupling bosses 56A downwardly protruding. The coupling bosses 56A are coupled to coupling holes 53A formed in the upper portions of the impeller wing pieces 54. The impeller lower cover 57 has a center hole 57A, in the center, through which the rotation shaft 55 passes, and a lower hole 57B through which the fluid in the flow pathway is introduced inside the impeller 50.

The rotor 60, preferably a ring magnet, is fixed to a rotor receiving part 58 formed in the impeller body 51 and arranged inside the stator 70 to rotate by interaction with a magnetic field changed when power is applied to the stator 70, thereby providing rotary power to the impeller 50.

Fig. 3 is a top perspective view illustrating the impeller 50 of the pump for circulating water 100 according to the present invention. Fig. 4 is a bottom perspective view thereof. Fig. 5 is an exploded perspective view of the impeller of Fig. 4 with the impeller lower cover 57 separated. Fig. 6 is a perspective view illustrating the impeller lower cover 57 of the present invention.

Referring to Fig. 3 to Fig. 6 together, the impeller 50 of the pump for circulating water 100 according to the present invention comprises an impeller body 51, a cavity 52, wing pieces 53, a base plate 54, an impeller upper cover 56 and an impeller lower cover 57.

The impeller body 51, the lower portion of the impeller, has the rotor receiving part 58 formed thereinside. The rotor 60 is received in and fixed to the rotor receiving part 58. The rotor receiving part 58 receives the rotor 60 therein. The cavity 52 is formed outside the rotor receiving part 58 in an inward direction of the rotor 60. The cavity 52, a space in which the fluid introduced through the lower hole 57B stays or moves, has a cross-sectional area greater than that of the lower hole 57B. The cavity 52 extends in a longitudinal direction, and is formed from the lower portion of the impeller body 51 to the upper portion of the impeller intermediate body 51D. The uppermost portion of the cavity 52 is connected with an upper hole 54A. The upper hole 54A has a cross-sectional area smaller than that of the cavity 52, in the same manner as the lower hole 57B. In the present invention, the cavity 52 is not a simple fluid pathway. In prior art, a pathway is formed to discharge pressure in the flow pathway 40; however, it cannot solve the problem of the impeller being lifted by a sudden increase in pressure. The cavity 52 can provide a broader space to ensure stable rotation of the impeller even in the case of a sudden increase in pressure.

Meanwhile, the impeller intermediate body 51D has a plurality of long holes 52A formed in the side surface in a longitudinal direction. The upper hole 54A, the long hole 52A and the lower hole 57B are preferably located on the same line in a longitudinal direction. In the drawings, three holes are arranged symmetrically with respect to the rotation shaft, but the number of holes is not necessarily limited to three. However, in order to ensure stable rotation, the holes are to be arranged symmetrically with respect to the rotation shaft.

The impeller 50 has a shaft insertion part 51A formed in the center in a longitudinal direction. A shaft support member 51C such as a bearing is coupled and fixed to the shaft insertion part 51A. A plurality of fitting holes 58A are formed in the outer circumference of the shaft insertion part 51A to be connected with the outside portion of the rotor receiving part 58 in the impeller body 51 and partition the cavity 52 in a longitudinal direction. In the drawings, three fitting holes 58A are arranged, but the number of fitting holes is not necessarily limited to three. A fitting protrusion 57C protruding upwardly from the impeller lower cover 57 is fitted to the fitting hole 58A to couple the impeller lower cover 57 to the impeller body 51.

An upper shaft support part 11B of the upper housing 10 is arranged in a through-hole 56B in the center of the impeller upper cover 56, and fluid is introduced in the inside of the pump for circulating water 100 through the inlet 11. The introduced fluid passes through the through-hole 56B of the impeller upper cover 56 and is discharged to the outlet 12 by rotation of the impeller wing pieces 53. Here, part of the fluid is not discharged to the outlet 12 but is introduced in the flow pathway 40 through an inflow pathway 51B, a pathway between the lower portion of the base plate 54 of the impeller 50 and the inner housing 30 or lower housing 20.

The impeller lower cover 57 has a center hole 57A, in the center, through which the rotation shaft 55 passes, and a plurality of lower holes 57B with which the cavity 52 is connected are symmetrically arranged around the center hole 57A. The plurality of fitting protrusions 57C upwardly protruding are fitted to the fitting holes 58A of the impeller body 51. The impeller lower cover 57 has a plurality of lower wing pieces 57D upwardly protruding. The lower wing pieces 57D allow the fluid in the cavity 52 to be discharged smoothly. In Fig. 6, three lower wing pieces 57D are arranged, but the number of lower wing pieces is not necessarily limited to three. The number thereof may be selected according to need. However, preferably, the lower wing pieces are arranged symmetrically with respect to the center.

Fig. 7 is a cross-sectional view illustrating the pump for circulating water 100 according to the present invention. As illustrated in Fig. 7, the shaft support member 51C inserted and fixed to the center of the impeller 50 is rotatably coupled with the rotation shaft 55. The upper portion of the rotation shaft 55 is coupled and fixed to an upper shaft insertion part 11C of the upper shaft support part 11B, and the lower portion of the rotation shaft 55 is coupled and fixed to a lower shaft insertion part 32A of a lower shaft support part 32. In the case where the inner housing 30 is not provided and the lower housing 20 serves as the inner housing 30 as well, the lower shaft support part 32 and the lower shaft insertion part 32A are to be arranged in the center of the lower housing 20.

The operation of the pump for circulating water 100 according to the present invention will be described with reference to Fig. 7.

The fluid introduced through the inlet 11 of the upper housing 10 is introduced in the inside of the pump for circulating water 100 in the C direction as illustrated. The introduced fluid passes through the partitions 11A in the inlet 11 and is discharged to the outlet 12 while the proceeding direction of the fluid is changed by rotation of the wing pieces 53 of the impeller 50. Part of the introduced fluid is not discharged directly to the outlet, but introduced in the flow pathway 40 under the lower portion of the impeller lower cover 57 through the inflow pathway 51B and the circumferential portion of the impeller body 51.

As the fluid is collected in the flow pathway 40, the pressure in the lower portion of the impeller 50 increases, which causes the impeller 50 to be lifted. Thereby, the impeller may not rotate smoothly or noise may be generated upon operation. In order to solve these problems, the present invention forms the cavity 52 in the impeller 50 in a longitudinal direction, and the fluid in the flow pathway 40 is introduced in the cavity 52 through the lower holes 57B. The fluid collected in the cavity 52 moves upwardly and is discharged to the upper portion through the long holes 52A formed in the side surface of the impeller body 51. Eventually, the fluid is mixed with the fluid discharged through the impeller wing pieces 53 near the outlet 12 at an upper side on the impeller 50 to be discharged through the outlet 12. The portion in which the fluid of the two routes is mixed is denoted as a mixing space S. In the present invention, the mixing space S is formed at the side of the outlet 12, which is outside, not inside, the impeller. Thus, it ensures stable operation of the impeller and prevents generation of noise.

Meanwhile, the upper hole 54A may be formed in the base plate 54 on the cavity 52 in order to prevent an increase in pressure in the cavity 52 and keep the pressure around the impeller wing pieces 53 and the pressure in the cavity 52 in equilibrium. The structure allows the present invention to form a smoother flow of fluid, thereby ensuring stable operation of the impeller and preventing generation of unnecessary noise.

The direction of the fluid introduced in the pump for circulating water 100 is changed by the impeller wing pieces 53 when the fluid passes through the partitions 11A in the inlet 11. Bubbles occur in the portion in which the direction of the fluid is changed, and cause noise. The structure for avoiding this issue will be described again with reference to Fig. 8 and Fig. 9.

Fig. 8 is a bottom view illustrating the upper housing 10 of the pump for circulating water 100 according to the present invention. Fig. 9 is a perspective view thereof.

As illustrated in Fig. 8 and Fig. 9, the inside of the inlet 11 of the upper housing 10 is partitioned into three spaces by the partitions 11A. However, the number of partitions 11A is not limited to three, but may be implemented into various numbers according to need. The upper shaft support part 11B is formed in the lower portion of the partitions A, and the upper shaft insertion part 11C to which the rotation shaft 55 is inserted and fixed is formed inside the upper shaft support part 11B.

One of the plurality of partitions 11A has an auxiliary partition 11D formed. The auxiliary partition 11D is formed in a circular arc shape around the circumference in the lower portion of the inlet 11 to downwardly protrude. The auxiliary partition 11D has a circular arc shape and may have an auxiliary partition protrusion 11E inwardly protruding, formed at the center of the circular arc shape in a longitudinal direction. As illustrated in Fig.8 and Fig. 9, the auxiliary partition 11D has a shape in which the lower portion and one side surface of both side surfaces, preferably the side surface towards the outlet 12, are opened. The structure can prevent generation of bubbles occurring in the lower portion of the plurality of partitions 11A, thereby avoiding unnecessary noise caused by bubbles.

The explanation in the present invention provided above is merely to provide examples to help understand the present invention, and is not intended to limit the scope of the present invention. The explanation in the present invention shall be defined by the accompanying claims, and it should be interpreted that simple modifications or alternations of the present invention made within the scope of the claims fall within the protection scope of the present invention.

Claims

A pump for circulating water, comprising:

an upper housing 10 having an inlet 11 and an outlet 12 of fluid;

a lower housing 20 coupled with the upper housing 10, having a stator 70 installed therein;

an inner housing 30 installed inside the lower housing 20;

an impeller 50 arranged to form a flow pathway 40, a space formed between the impeller and the inside lower surface of the inner housing 30; and

a rotor 60 installed in the impeller 50,

wherein the impeller 50 has a cavity 52 formed therein in a longitudinal direction, wherein a plurality of lower holes 57B are formed under the cavity 52, and a plurality of long holes 52A are formed in the side surface of the cavity 52, such that fluid collected in the flow pathway 40 is introduced in the cavity 52 through the lower holes 57B and discharged to the outlet 12 through the long holes 52A.
The pump for circulating water of claim 1, wherein the inside of the inlet 11 is partitioned by a plurality of partitions 11A, and one of the plurality of partitions has an auxiliary partition 11D downwardly extending.
The pump for circulating water of claim 2, wherein the auxiliary partition 11D has an auxiliary partition protrusion 11E inwardly protruding, formed at the center of the inside of the auxiliary partition 11D in a longitudinal direction.
A pump for circulating water, comprising:

an upper housing 10 having an inlet 11 and an outlet 12 of fluid;

a lower housing 20 coupled with the upper housing 10, having a stator 70 installed therein;

an impeller 50 arranged to form a flow pathway 40, a space formed between the impeller and the inside lower surface of the lower housing 20; and

a rotor 60 installed in the impeller 50,

wherein the impeller 50 has a cavity 52 formed therein in a longitudinal direction, wherein a plurality of lower holes 57B are formed under the cavity 52, and a plurality of long holes 52A are formed in the side surface of the cavity 52, such that fluid collected in the flow pathway 40 is introduced in the cavity 52 through the lower holes 57B and discharged to the outlet 12 through the long holes 52A.
A pump for circulating water, comprising:

an upper housing 10 having an inlet 11 and an outlet 12 of fluid;

a lower housing 20 coupled with the upper housing 10, having a stator 70 installed therein;

an inner housing 30 installed inside the lower housing 20;

an impeller 50 arranged to form a flow pathway 40, a space formed between the impeller and the inside lower surface of the inner housing 30; and

a rotor 60 installed in the impeller 50,

wherein the inside of the inlet 11 is partitioned by a plurality of partitions 11A, and one of the plurality of partitions has an auxiliary partition 11D downwardly extending.
A pump for circulating water, comprising:

an upper housing 10 having an inlet 11 and an outlet 12 of fluid;

a lower housing 20 coupled with the upper housing 10, having a stator 70 installed therein;

an impeller 50 arranged to form a flow pathway 40, a space formed between the impeller and the inside lower surface of the lower housing 20; and

a rotor 60 installed in the impeller 50,

wherein the inside of the inlet 11 is partitioned by a plurality of partitions 11A, and one of the plurality of partitions has an auxiliary partition 11D downwardly extending.