KR19980014094A - Electronic rotary switch pump for boiler - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic rotary centrifugal pump for a boiler, and more particularly, to an electromagnetic rotary centrifugal pump for a boiler which uses a repulsive force between a permanent magnet mounted on a rear surface of an impeller and an electromagnet core assembly provided on the opposite side of the impeller A lower housing 5 forming an outer body and an upper housing 3 mounted on the lower housing 5. The lower housing 5 is inserted and fixed in the lower housing 5, A stator 11 in which a plurality of N poles and S poles are alternately arranged in the circumferential direction, a rotor magnet 30 mounted at a lower end thereof so as to correspond to a plurality of N poles and S poles of the stator 11, A rotor assembly 7 mounted on an upper portion of the upper housing 3 with an impeller 28 mounted thereon and disposed above the stator 11 with a separator 13 therebetween; Is input consists of a cover disk 31 that is to cover the rotor assembly (7).

Description

Electromagnetic rotaryless circulation pump for boiler

The present invention relates to an electromagnetic rotary centrifugal pump for a boiler, and more particularly to an electromagnetic rotary centrifugal pump for a boiler, which comprises a permanent magnet mounted on a rear surface of an impeller as an impeller rotating means and a rotary Circulating pump.

Generally, there are oil boilers and gas boilers in boilers used for heating and hot water supply at home. Among them, general type of gas boiler is a gas boiler as schematically shown in Fig.

The gas boiler 101 comprises a heat exchanger 103, a gas burner 105, a circulating pump 107, a water flow sensor 109 and a three-way valve 111 as shown. Therefore, depending on the use state, the boiler 101 changes the flow path of water flowing in the system as shown by the solid line in Figs. 1A to 1C.

1A shows a water circulation state when the boiler 101 is used only for supplying hot water. At this time, the water introduced from the water supply source through the inlet 113 flows through the water flow sensor 109 to form a double tube And then flows into the inner tube of the heat exchanger (103). The inflowing water is heated by the gas burner 105 to become hot water, and then flows out to the outside through the discharge valve 115.

At this time, since the three-way valve 111 blocks the flow path to the heating side, the water circulated through the outer pipe of the heat exchanger 103 absorbs heat to be used for heating, and can be heated at a high temperature within a short time.

1B shows a state in which the boiler 101 is used only for heating. In this case, the three-way valve 111 is opened to the heating side, and the water is likewise heated to the outside of the heat exchanger 103 And flows only through the flow path through the pipe, and is heated through the heating pipe 117.

Finally, as shown in FIG. 1C, the boiler 101 is opened in the same manner as the state of FIG. 1B in the three-way valve 111 and at the same time, the discharge valve 115 is also opened, So that hot water can be supplied simultaneously with heating.

As described above, the gas boiler 101 uses the circulation pump 107 as a means for circulating and supplying the hot water and the hot water. Depending on the type of the boiler, the circulation pump 107 may be a motor- Shaped motor-mechanical circulating pumps, and in the case of domestic gas boilers, mainly circulating circulating pumps have been used.

Such a canned circulation pump is press-fitted into the fixing pin 203 and mounted on the upper end of the center shaft 205, as shown in the decomposition state 201 in FIG. 2, to rotate around the shaft 205 A rotor 209 and an impeller 207 which are directly connected to the lower end of the impeller 207 in the axial direction and mounted around the shaft 205 for rotating the impeller 207, The sealing plate 211 and the upper peripheral portion 213 abut against the bottom surface of the sealing plate 211 to prevent penetration of the hot water and the heating water introduced into the rotor 209 directly into the rotor 209, A can 219 having a shape that can be matched and formed with a protruding opening 217 which is taped to insert and fix the adjustment ring 215 in the center of the lower surface of the can 219, And an inner circumferential surface It is composed of emitter 209, the stator 221, the circumferential outer case 223 which is press-fitted in a position corresponding to the.

1, the hot water is circulated through the hot water passage as shown in FIG. 1. When the operation switch built in the outer case 223 is turned on, the stator 221 And the rotor 209 is rotated through the can 219 which is magnetized and interposed therebetween. As the rotor 209 rotates, the impeller 207 mounted to interlock with the rotor 209 by the shaft 205 rotates, and the hot water flows and circulates by the rotation of the impeller 207.

At this time, a slight gap is maintained between the rotor 209 and the inner circumferential surface of the can 219 so that the rotor 209 of the pump 201 can rotate more smoothly inside the can 219, And the hot water layer serves as lubricating oil.

However, in the case of such a can circulation pump 201, the can 219 is interposed between the rotor 209 and the stator 221, so that the gap between the rotor 209 and the stator 221 is relatively small There is a disadvantage in that the efficiency of the pump 201 is lowered due to an increase in the magnetic gap.

If the pump 201 is left in a stopped state due to foreign matter or the like that may be present in the heating water, rust or the like may be generated on the contact surface between the rotor 209 and the can 219, There is a fear that the adhesive layer may become sticky. In particular, when the pump 201 is not used for a long period of time as in the summer, the initial operation becomes impossible due to an increase in water. If the pump 201 is operated for a long time without circulating water in the oil passage, And the bearings may be worn out, resulting in damage to the coils of the stator 221.

In addition, the boiler 201 has a number of defects such as that the proportional control of the pump can not be controlled when the heating load is changed.

In order to improve and overcome various disadvantages of the conventional canned circulation pump, the cause of the problem is an upper housing mounted on a lower housing and a lower housing forming an outer body, an inner housing fixed to the lower housing, A plurality of N poles and S poles are arranged alternately in the circumferential direction, a rotor magnet is mounted on the lower end thereof to correspond to a plurality of N poles and S poles of the stator, an impeller is mounted on the upper end thereof, And a lid disc inserted into the opening of the upper housing to cover the rotor assembly. The present invention also provides an electronic rotary-type circulation pump for a boiler.

The bush is slidably fitted around the center shaft. The washer and the bush are respectively fitted around the central shaft so as to form an axial sliding surface on the upper and lower surfaces of the bush. A rotor magnet casing integrally injection-molded on the outer circumferential surface, an impeller integrally injection-molded on the upper surface of the casing so as to rotate around the center shaft, and an N pole and an S pole exposed on the bottom surface of the casing, A plurality of rotor magnets which are radially symmetric and integrally attached by injection molding and a Hall sensor mounted on an interface between any one of the interfaces of the plurality of rotor magnets, An electronic rotary-type circulation pump.

A plurality of cores formed radially symmetrically so that N poles and S poles are alternately arranged by magnetic induction; a coil wound around the core and connected to a drive circuit attached to the outside of the body; There is provided an electronic rotary-type circulation pump for a boiler having a stator having radial slots in the same number as a core for winding a coil between a plurality of cores and a mounting hole for inserting a cylindrical rod in a central portion thereof .

1 is a schematic view showing a gas boiler equipped with a canned type circulation pump for a conventional boiler,

1A is a diagram showing the flow of water when used for hot water supply,

1B shows the flow of water when used for heating,

1C is a view of water flow when used for hot water supply and heating.

2 is an exploded cross-sectional view of a conventional canned circulation pump;

3 is a half sectional view of an assembled state of an electronic rotary-type circulation pump for a boiler according to the present invention.

4 is a half sectional view of the decomposition state of the circulation pump shown in Fig. 3;

5A is a plan view of the stator shown in Fig.

Fig. 5B is a bottom view of the stator shown in Fig. 4; Fig.

6 is a plan view of the washer shown in Fig.

7 is a plan view of the impeller shown in Fig.

8 is a bottom view of the rotor magnet shown in Fig.

DESCRIPTION OF THE REFERENCE NUMERALS

1: Rotary swirl pump 3, 5: Upper and lower housing

7: rotor assembly 8: coil

9: core 11: stator

12: Slot 13: separator plate

15: Cylindrical rod 17: Insertion hole

21: center shaft 22: bush

23: Male threads 24: Washers

25: Female thread portion 26: Rotor magnet casing

27: circumferential projection 28: impeller

29: Jaw 30: Rotor magnet

31: Cover disk 37: Hall sensor

Hereinafter, an embodiment of an electromagnetic rotary centrifugal pump for a boiler according to the present invention will be described with reference to the accompanying drawings.

The rotary-type circulation pump according to the present invention, indicated by reference numeral 1 in FIGS. 3 and 4, has upper and lower housings 3 and 5 forming a flat outer shape having a shorter axial length than the diameter. 5A, a stator 11 having a plurality of radially symmetrical cores 9, for example, six cores 9 in this embodiment, is inserted into the lower housing 5, A concave portion 14 opened at the center of the face and a projection 16 protruding from the center of the bottom surface of the lower housing 5 are engaged with each other and screwed into a screw inserted through the screw hole 10 opened at the center of the projection .

The cores 9 are divided by the same number of slots 12 as the radially extending cores 9 and the arrangement of the magnetic poles generated by the currents when flowing current is alternately The coil 8 is wound so as to be an N pole and an S pole. At this time, since the cross-sectional shape of the core 9 becomes a sector shape as shown in FIG. 5A and is closely arranged in the circumferential direction, the contact ratio of the coil 8 conductor in the magnetic gap is increased.

A separator 13 is placed on the upper end of the stator 11 and the separator 13 is attached to the center of the lower surface and the cylindrical rod 15 extending downward is opened at the center position of the stator 11 And is inserted and installed in the insertion hole 17.

A rotor assembly 7 is installed at the upper end of the separator 13 and the rotor assembly 7 is held at a very small gap with the separator 13 so that the armature core 9 of the stator 11 comes into the magnetic gap And a tapped male screw portion 23 attached to the lower end of the center shaft 21 is screwed to the female screw portion 25 provided at the upper end of the cylindrical rod 15 of the separator plate 13, Respectively.

A precision machined ceramic bush 22 is fitted around the center shaft 21 of the rotor assembly 7 so as to allow sliding movement. The washer 24 and the ceramic washer 24 are sandwiched around the center shaft 21, respectively. 6, a portion of the inner circumferential surface of the washer 24 is formed into a straight line so as to prevent rotation in the circumferential direction, and at the same time, the outer circumferential surface of the center shaft 21 also corresponds to the inner circumferential surface of the washer 24 A part of which is cut into a flat state.

On the outer circumferential surface of the bush 22, a rotor magnet casing 26 is integrally injection-molded. In this casing 26, the impeller 28 is provided on the upper surface, and the rotor magnet 30 as shown in Fig. 8 is integrally coupled by injection molding in a state where the bottom surface is exposed in the lower portion.

Here, the rotor magnet 30 has a structure in which a plurality of magnets 30, for example, six magnets 30 in this embodiment, are magnetically coupled to the N pole and the S pole, respectively, so as to correspond to the magnetic poles generated by the armature coils 8 of the stator 11 And the magnets 30 are formed in a fan shape so as to form a strong magnetic pole in the axial direction. In addition, an oxidized ferrite magnet is used as the material to increase the corrosion resistance against circulating hot water or heating water.

7, the impeller 28 has a plurality of spiral-shaped blades 33, and protrusions 35 having the same curvature as the blades protrude from the upper edge of the blades.

4, the upper housing 3 is mounted on the upper end edge of the lower housing 5 to engage the peripheral protrusion 27 of the separator 13 to surround the rotor assembly 7 therein A lid disc 31 is seated on a latching protrusion 29 of the upper housing 3 so as to cover the rotor assembly 7 on the rotor assembly 7.

According to the electronic rotary-style circulation pump 1 constructed as above, the pump drive signal is transmitted to the drive circuit attached to the outside of the body of the pump 1 first. Accordingly, when a current flows through the armature coil 8 of the stator 11, there is a case where there is a conductor through which a current flows in a runner formed by the rotor magnet 30. Therefore, A repulsive force opposite to that between the core 9 and the rotor magnet 30 of the rotor assembly 7 is generated as one torque and the rotor assembly 7 is rotated.

The rotor assembly 7 is rotated about the center shaft 21 which is in sliding contact with the bush 22 by a repulsive force with the armature core 9. [ The rotation torque of the rotor assembly 7 is changed according to the position of the rotor magnet 30 so that the relative positions of the magnetic pole of the rotating rotor assembly 7 and the armature core 9 of the stator 11, The current flowing through the armature coil 8 through the drive circuit outside the pump that is sensed by the phase detection hall sensor 37 inserted into any one of the interface surfaces of the armature coils 30 and connected to the hall sensor So as to rotate continuously.

The torque of the rotor assembly 7 is determined by the magnetic flux density of the rotor magnet 30, that is, the armature current flowing through the coil 8, that is, the ampere turn. It is necessary not only to increase the number of windings of the coil 8 as much as possible but also to minimize the magnetic gap by designing the gap formed between the rotor assembly 7 and the core 9 of the stator 11 as small as possible.

As the rotor assembly 7 rotates, the impeller 28, which is integrally formed at the upper end, rotates, so that the heating water or hot water flows into and out of the pump 1. Thus, the heating water or hot water .

Therefore, according to the rotary-type circulation pump of the present invention, in place of the rotor for rotating the impeller, the permanent magnet generated by inserting the permanent magnet into the back surface of the impeller and the armature core assembly capable of driving the permanent magnet on the opposite side, And the impeller is rotated using the repulsive force of the armature core. Therefore, even if the impeller is not used for a long time, the can and the rotor are fixed by the foreign substance as in the case of the circulation pump, .

Further, since the relative position of the rotor magnet and the armature core is sensed by the Hall sensor to control the current flowing through the armature coil, the operation of switching the armature current by the conventional commutator and the brush is substituted, so that the commutator and the brush can be removed .

Therefore, the current flowing in the coil can be controlled more precisely than in the conventional method, and the unevenness of the rotation torque can be eliminated, so that the proportional control of the pump can be performed at the time of load variation. At the same time, So that cost reduction by productivity improvement can be achieved.

While the invention has been shown and described with respect to specific embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Anyone who can afford it will know.

The present invention is characterized in that instead of using a rotor as a means for rotating the impeller, a permanent magnet is inserted into the rear surface of the impeller and a core assembly capable of rotationally driving the permanent magnet is provided on the opposite side of the impeller. The object of the present invention is to circulate the hot water along the flow path of the boiler system by a pump which is adapted to rotate the impeller by interaction.

Claims (9)

An upper housing 3 mounted on the lower housing 5 to form an outer body and a plurality of N and S poles inserted and fixed in the lower housing 5 by electromagnetic induction, A rotor magnet 30 is mounted on the lower end of the stator 11 so as to correspond to a plurality of N poles and S poles of the stator 11 and an impeller 28 is mounted on the upper end thereof A rotor assembly 7 disposed above the stator 11 with a separator 13 interposed therebetween and a cover disk inserted into an opening of the upper housing 3 to cover the rotor assembly 7, (31). The electromagnetic rotary-type circulation pump for a boiler according to claim 1, The rotor assembly (7) according to claim 1, wherein the rotor assembly (7) comprises a center shaft (21) having a tapped threaded portion (23) at its lower end, a bush (22) slidably fitted around the center shaft (21) A washer 24 fitted around the center shaft 21 so as to form an axial slidable surface on the upper and lower surfaces of the bush 22 and a rotor magnet casing 22 integrally injection molded on the outer circumferential surface of the bush 22 26, an impeller 28 integrally injection-molded on the upper surface of the casing 26 so as to rotate about the center shaft 21, and an impeller 28 having N and S poles exposed on the bottom surface of the casing 26 And a plurality of rotor magnets 30 arranged alternately and radially symmetrical and integrally attached by injection molding and a plurality of rotor magnets 30 mounted on one of the interfaces of the plurality of rotor magnets 30 Sensor 37 Wherein the rotary pump is a rotary pump. The electromagnetic rotary switch according to claim 2, characterized in that the rotor assembly (7) is installed with a slight gap from the separator (13) so that the armature core (9) of the stator (11) Circulation pump. 3. The electromagnetic rotary centrifugal pump according to claim 2, wherein the rotor magnet (30) is arranged in a circumferential direction in a fan shape to form a strong magnetic pole in the axial direction. The electromagnetic rotary centrifugal pump according to claim 2, wherein the rotor magnet (30) is made of ferritic material oxidized to improve corrosion resistance. The washer (24) according to claim 2, wherein a portion of the inner circumferential surface of the washer (24) is linearly machined so as to prevent rotation in the circumferential direction, and an outer circumferential surface of the center shaft (21) And a portion corresponding to the inner circumferential surface of the rotor is machined in a planar manner. The separator according to claim 1, wherein the separator (13) is formed in a circumferential direction at an outermost edge portion in a radial direction and has a peripheral protrusion (27) engaging with an edge surface of the upper housing (3) And a cylindrical rod (15) having a female screw (25) threadedly engaged with the male screw (23) at the lower end of the central shaft (21) at the upper end thereof. The stator of claim 1, wherein the stator (11) comprises: a plurality of cores (9) radially symmetrically formed such that N poles and S poles are alternately arranged by magnetic induction; (8) for winding the coil (8) between the plurality of cores (8), and a coil (8) connected to a drive circuit attached to the outside of the body (12) is formed radially, and a mounting hole (17) for inserting the cylindrical rod (15) is opened in the central portion. 9. The electromagnetic rotary centrifugal pump as claimed in claim 8, characterized in that the core (9) has a fan-shaped cross-sectional shape and is closely arranged in the circumferential direction.