WO2018052184A1

WO2018052184A1 - Pump for circulating hot water

Info

Publication number: WO2018052184A1
Application number: PCT/KR2017/007374
Authority: WO
Inventors: Jeong Cheol Jang; Kyoung Joo Lee; Byung Soo Kim; Joo Hyun Oh; Jeong Soo Cha
Original assignee: New Motech Co., Ltd.; Kyungdong Navien Co., Ltd.
Priority date: 2016-09-13
Filing date: 2017-07-11
Publication date: 2018-03-22
Also published as: KR101827295B1

Abstract

The pump for circulating hot water according to the present invention, comprises: an upper housing formed with an inlet and an outlet of fluid and formed with an upper shaft supporting part in a middle part; a lower housing arranged and installed to fit in a lower side of the upper housing, having a receiving space formed therein; an inner housing having an edge part interposed between the upper housing and the lower housing, and a shaft supporting part formed in a lower part of the center of a bottom part of an impeller receiving groove formed in a middle part; an impeller received inside the upper housing and in the impeller receiving groove to be rotatably installed, so as to form a flow pathway with an inner surface of the inner housing for the flow of fluid; a rotor installed inside an outer circumference of the impeller; and a stator installed in a receiving space between the inner housing and the lower housing to fit in with the rotor, wherein rotation wings are installed at predetermined intervals along the outer side of a rotor receiving part having a rotor receiving space formed along a lower part of the body of the impeller so that the fluid in the flow pathway is discharged to the upper side.

Description

PUMP FOR CIRCULATING HOT WATER

The present invention relates to a pump for circulating hot water. More specifically, the present invention relates to a pump for circulating hot water which secures smooth flow of fluid by discharging part of the fluid and air intruding into the lower part of a pump chamber without loss of discharge pressure while discharging to a fluid outlet, thereby improving the head efficiency of the pump, and improves durability by preventing damage to an impeller.

In general, the pump for circulating hot water used as a feed pump for a low pressure boiler, etc. uses a centrifugal pump, and such pump for circulating hot water is disclosed in prior art, Korean Patent No. 10-1204344. This patent reference provides a technology of rotating an impeller installed with a rotor by the electromagnetic induction between a stator and the rotor to introduce fluid (water) to the inlet of the lower part of the reservoir, discharging the fluid (water) through a pathway between the wing piece of an impeller body and the upper cover of the impeller by pumping, and delivering the introduced fluid along a discharge line via an outlet to a place of use such as a heating mat, etc. through a connecting line after heating the fluid by a heating means.

In particular, in the prior art, a plurality of discharge holes vertically penetrating the impeller that is interconnected with the flow pathway are formed so that the fluid in the flow pathway formed between the outer surface of the impeller body and the impeller receiving groove of the inner housing is discharged upwards.

Therefore, according to the prior art, during the pumping action of the impeller, part of the hot water (part of the fluid) discharged through the pathway between the wing piece and the impeller upper cover and air included therein are smoothly discharged upwards while being introduced into the flow pathway formed between the outer surface of the impeller body and the impeller receiving groove of the inner housing and the discharge holes vertically penetratingly formed through the impeller body. Thus, since cavitation does not occur in the flow pathway even during high speed rotation of the impeller, hot water is circulated smoothly. Also, since the rise of the impeller is prevented, the vibration or noise can be blocked which is generated from the contact with the inner surface of the upper housing or adjacent parts because of the rise of the impeller.

However, part of the hot water and air introduced into the flow pathway rise through the plurality of discharge holes that vertically penetrate the impeller during the driving of the impeller and are discharged through the wing piece of the impeller. Thus, the pressure of part of the hot water rising along the discharge holes is applied to the wing piece of the impeller, thereby generating a great pressure difference in front of and behind the wing piece of the impeller during high speed rotation. Accordingly, the action bothering the rotation may occur, which inhibits the rotation of the wing piece of the impeller.

Therefore, there are problems such that the head efficiency deteriorates sharply due to the loss of discharge pressure discharged to the outlet because the rotatory power of the impeller is reduced and thus the flow of fluid is not smooth and that the durability of the impeller is lowered significantly because of damage to the wing piece of the impeller caused thereby as well as generation of noise and excessive vibration occurring when the impeller rotates.

The technical task of the present invention is to improve durability of the impeller by preventing damage to the impeller by allowing part of the hot water and air introduced into the flow pathway to be discharged regardless of the wing piece of the impeller so that there is no difference in water pressure between the input and output fluid, and to significantly improve the head efficiency of the pump for circulating hot water by promoting smooth flow of fluid.

The pump for circulating hot water according to the present invention comprises: an upper housing 10 formed with an inlet 11 and an outlet 12 of fluid and formed with an upper shaft supporting part in a middle part; a lower housing 20 arranged and installed to fit in a lower side of the upper housing 10, having a receiving space formed therein; an inner housing 30 having an edge part interposed between the upper housing 10 and the lower housing 20, and a shaft supporting part 32 formed in a lower part of the center of a bottom part of an impeller receiving groove 31 formed in a middle part; an impeller 50 received inside the upper housing 10 and in the impeller receiving groove 31 to be rotatably installed, so as to form a flow pathway 40 with an inner surface of the inner housing 30 for the flow of fluid; a rotor 60 installed inside an outer circumference of the impeller 50; and a stator 70 installed in a receiving space between the inner housing 30 and the lower housing 20 to fit in with the rotor 60.

In the present invention, a plurality of rotation wings 52 may be installed at predetermined intervals along the outer side of a rotor receiving part 51d having a rotor receiving space 51d' formed along a lower part of the body 51 of the impeller 50 so that the fluid in the flow pathway 40 is discharged to the upper side.

In the present invention, preferably, a spiral guiding groove 33 is formed along the inner circumferential surface of the inner housing 30.

The present invention discharges part of the hot water (fluid) and air intruding into the flow pathway by raising the hot water (fluid) and air while rotating them with a rotation wing at a lower part of the impeller body, and thus has an effect of allowing the impeller wing piece to rotate smoothly without pressure bothering rotation and maintaining the water pressure at a consistent level inside the pump, thereby preventing damage to the impeller and greatly improving the durability of the impeller.

Also, the present invention allows smooth rotation of the wing piece, thereby inhibiting the generation of excessive vibration or noise occurring in the wing piece because there is no pressure by hot water inside the flow pathway applied to the wing piece of the impeller.

In addition, the present invention has an effect of significantly improving the head efficiency of the pump by quickly mix-discharging part of the hot water inside the flow pathway through the outlet by the suction force of the wing piece of the impeller while grinding by the rotation of a rotating wing by driving the impeller regardless of the wing piece of the impeller, thereby excluding the loss of discharge pressure and leading to the smooth flow of the fluid.

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

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

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

Fig. 4 is a cross-sectional view illustrating an impeller body of the pump for circulating hot water according to the present invention;

Fig. 5 is a longitudinal cross-sectional view of a pump for circulating hot water according to the present invention; and

Fig. 6 is a longitudinal cross-sectional view of another embodiment of the pump for circulating hot water according to the present invention.

Fig. 1 is a combined perspective view according to an embodiment of the present invention. Fig. 2 is an exploded perspective view of the present invention. Fig. 3 is a perspective view of an impeller of the present invention. Fig. 4 is a cross-sectional view of an impeller body of the present invention. Fig. 5 is a longitudinal cross-sectional view of the present invention. Fig. 6 is a longitudinal cross-sectional view according to another embodiment of the present invention. The embodiments of the present invention are explained in detail with reference to the attached drawings.

In the present invention, a pump for circulating hot water 100 comprises: an upper housing 10 formed with an inlet 11 and an outlet 12 of fluid and formed with an upper shaft supporting part in a middle part; a lower housing 20 arranged and installed to fit in a lower side of the upper housing 10, having a receiving space formed therein; an inner housing 30 having an edge part interposed between the upper housing 10 and the lower housing 20, and a shaft supporting part 32 formed in a lower part of the center of a bottom part of an impeller receiving groove 31 formed in a middle part; an impeller 50 received inside the upper housing 10 and in the impeller receiving groove 31 to be rotatably installed, so as to form a flow pathway 40 with an inner surface of the inner housing 30 for the flow of fluid; a rotor 60 installed inside an outer circumference of the impeller 50; and a stator 70 installed in a receiving space between the inner housing 30 and the lower housing 20 to fit in with the rotor 60.

In the present invention, a plurality of rotation wings 52 are installed at predetermined intervals along the outer side of a rotor receiving part 51d having a rotor receiving space 51d' formed along a lower part of the body 51 of the impeller 50 so that the fluid in the flow pathway 40 is discharged to the upper side. That is, the pump portion performing pumping and the motor portion are integrally formed in one body.

The upper housing 10 has a structure formed with the inlet 11 and the outlet 12 of fluid, the upper shaft supporting part 13 inside the middle part, a middle protrusion protruding in a circular cap shape at the center, and a flange part to be coupled to the inner housing 30 in the circumference thereof. Also, the inlet 11 protrudes in a pipe shape in one direction inside the middle protrusion, and the outlet 12 protrudes in a pipe shape in a direction perpendicular to the inlet 11 to be interconnected with the internal space of the impeller 50.

The lower housing 20 is arranged and installed to fit in a lower side of the upper housing 10. It is formed in a cylindrical shape of which the bottom is sealed to form a receiving space thereinside, and has a fixing hole part at the center, on which the shaft supporting part 32 of the inner housing 30 is mounted and into which a coupling member is inserted.

The inner housing 30 is installed between the upper housing 10 and the lower housing 20. It is formed with the impeller receiving groove 31 in the middle part for receiving the impeller 50, and the shaft supporting part 32 in the lower part of the center of the bottom part of the impeller receiving groove 31.

Also, the inner housing 30 is formed with a receiving space for installing the stator 70 in the outer circumference in a state inserted into the lower housing 20, and a coupling hole for the coupling member coupled through the fixed hole of the lower housing 20 in the lower part of the shaft supporting part 32.

The impeller 50 is rotatably inserted inside the upper housing 10 and on the impeller receiving groove 31, so as to substantially perform the pumping action. The flow pathway 40 is formed between the outer surface of the impeller body 51 and the inner surface of the inner housing 30.

Here, the flow pathway 40 is subdivided into a side surface surrounding flow pathway 40a and a lower flow pathway 40b to explain the technical gist of the present invention in detail.

Also, the impeller 50 comprises the impeller body 51, an impeller rotation shaft 55 installed in the impeller body 51, an impeller upper cover 56 and an impeller lower cover 57, installed in the upper part and lower part of the impeller body 51.

The impeller body 51 has a shaft insertion hole 51a vertically penetrating the body formed in a cylindrical shape, and an introduction groove 51b is tensioned in the upper part of the body. Also, while receiving the rotor 60 by embedding the rotor 60 in the rotor receiving space 51d' of the rotor receiving part 51d installed around the lower part of the impeller body 51, a plurality of wing pieces 53 are formed around the upper part of the body formed with the introduction groove 51b.

Further, a coupling hole for coupling the impeller upper cover 56 is formed on the upper surface of the wing piece 53.

In particular, according to the conventional pump, when performing input and discharge of fluid, part of the fluid that is input and air included in the fluid intrude into the side surface surrounding flow pathway 40a to be collected in the lower flow pathway 40b of a lower part at the outer side of the impeller body 51. At that time, bubbles occur because of the collected fluid while driving the pump, and accordingly noise and excessive vibration may be generated, thereby deteriorating the efficiency of the pump. In order to overcome this problem, the present invention aims to discharge the fluid inside the flow pathway 40 to the upper side. The impeller 50 of the present invention is installed with the plurality of rotation wings 52 at predetermined intervals along the outer circumference of the lower rotor receiving part 51b of the body 51, in addition to the wing piece 53 formed in the upper part of the body 51 of the impeller 50, so that the fluid inside the flow pathway 40 is discharged to the upper side. The wing piece 53 and the rotation wing 52 are rotated simultaneously in the same direction during the driving of the impeller 50 so that the wing piece 53 discharges the fluid introduced to the inlet 11 to the outlet 12. The rotation wing 52 grinds part of the fluid intruding into the side surface surrounding flow pathway 40a by the rotation wing between the inner side surface of the inner housing 30 and the outer side of the rotation wing 52, and allows the fluid to be mix-discharged to the outlet 12 by the suction force generated from the rotation of the wing piece 53. The fluid of the case where another part of fluid is collected in the lower flow pathway 40b rotates by the rotation wing 52 while rising to the side surface surrounding flow pathway 40a between the inner side surface of the inner housing 30 and the outer side of the rotation wing 52, and part of the rising fluid may be mix-discharged to the outlet 12 while being ground by the rotation wing 52 as above.

Therefore, while grinding part of the fluid and air residing in the flow pathway 40 by the rotation wing 52 during high speed rotation of the impeller 50, the fluid and air are quickly discharged to the outlet 12 by the suction force generated from the rotation of the wing piece 53. Therefore, part of the fluid discharged to the upper side by the wing piece 53 of the impeller 50 is discharged without collision, so as to maintain the rotatory force of the wing piece 53 and promote smooth fluid flow, thereby performing pumping without loss of discharge pressure and improving the head efficiency to the most.

Also, as another embodiment of the present invention, as illustrated in Fig. 6, a spiral guiding groove 33 may be formed along the inner circumferential surface of the inner housing 30, so as to raise part of the fluid collected in the lower flow pathway 40b by rotating the rotation wing 52, while guiding the fluid to the spiral guiding groove 33 to discharge the fluid to the upper part, thereby accomplishing discharge more quickly.

That is, part of the fluid collected in the lower flow pathway 40b moves in one direction of the lower flow pathway 40b by the rotation of the rotation wing 52, so as to rise along the spiral guiding groove 33. Thus, the fluid may rise more quickly than the rising speed of fluid rising along the inner circumferential surface of the inner housing 30, and thus the water pressure difference in the upper part and lower part inside the pumping means may be maintained to be the same.

Meanwhile, the impeller rotation shaft 55 comprises a shaft supporting member 51c installed on its outer circumferential surface to be inserted in the shaft insertion hole 51a.

Also, the impeller upper cover 56 is formed with a combination boss 56a inserted into a coupling hole formed in the wing piece 53 at a lower surface of the body having a circular plate shape, and a penetrating hole 56b interconnected with the inlet 11 and the insertion groove 51b of the impeller body 51.

Further, the impeller lower cover 57 is combined with the lower part of the impeller body 51 to seal the rotor receiving space 51d'. Reference numeral 57a denotes a rotation shaft passing hole, and 57b denotes an insertion protrusion.

The rotor 60 is installed inside the outer circumference of the impeller 50, and is formed of a magnet in a circular ring shape magnetized with the north polar and the south polar repetitively, so as to be inserted and installed in the rotor receiving space 51d' of the impeller body 51.

Also, the stator 70, which is installed at a position to fit in with the rotor 60 for electromagnetic induction with the rotor 60, comprises a core 71 wound, an upper core supporting member 72 combined with the upper part to support the upper side of the core 71, and a lower core supporting member 73 combined with the lower part to support the lower side of the core 71. The core 71 is formed in a structure having a plurality of core teeth protruding towards the inside of the body which has the overall shape of an approximately circular ring shape. The upper core supporting member 72 and the lower core supporting member 73 are formed in a shape having a plurality of guide protrusions protruding towards the upper surface and lower surface of ring-shaped plates. In the drawings, reference numeral 80 denotes a circuit substrate, and 90 denotes a power supply connector.

The above description explains the pump for circulating hot water 100 performing the pumping action, which circulates heated hot water to a place of use such as a heating mat, etc. However, the present invention may be applied to a circulation pump performing input and discharge of fluid which is not hot water, and explanation is omitted on a heating means, etc. according to the power supply added to the pump for circulating hot water.

Although the present invention is described as above with reference to embodiments, the embodiments are merely examples and do not limit the present invention. Also, it should be understood that various modifications and applications which are not exemplified in the above can be made by those skilled in the art within a scope not deviating from the essential properties of the present embodiments. In addition, it should be interpreted that differences associated with such modifications and applications fall within the scope of the present invention as prescribed by the appended claims.

Claims

A pump for circulating hot water, comprising:

an upper housing 10 formed with an inlet 11 and an outlet 12 of fluid and formed with an upper shaft supporting part in a middle part;

a lower housing 20 arranged and installed to fit in a lower side of the upper housing 10, having a receiving space formed therein;

an inner housing 30 having an edge part interposed between the upper housing 10 and the lower housing 20, and a shaft supporting part 32 formed in a lower part of the center of a bottom part of an impeller receiving groove 31 formed in a middle part;

an impeller 50 received inside the upper housing 10 and in the impeller receiving groove 31 to be rotatably installed, so as to form a flow pathway 40 with an inner surface of the inner housing 30 for the flow of fluid;

a rotor 60 installed inside an outer circumference of the impeller 50; and

a stator 70 installed in a receiving space between the inner housing 30 and the lower housing 20 to fit in with the rotor 60.
The pump for circulating hot water of claim 1, wherein a plurality of rotation wings 52 are installed at predetermined intervals along the outer side of a rotor receiving part 51d having a rotor receiving space 51d' formed along a lower part of the body 51 of the impeller 50 so that the fluid in the flow pathway 40 is discharged to the upper side.
The pump for circulating hot water of claim 1 or 2, wherein a spiral guiding groove 33 is formed along the inner circumferential surface of the inner housing 30.