KR101680118B1 - Electric boiler using fluid frictional heat - Google Patents

Electric boiler using fluid frictional heat Download PDF

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Publication number
KR101680118B1
KR101680118B1 KR1020160013846A KR20160013846A KR101680118B1 KR 101680118 B1 KR101680118 B1 KR 101680118B1 KR 1020160013846 A KR1020160013846 A KR 1020160013846A KR 20160013846 A KR20160013846 A KR 20160013846A KR 101680118 B1 KR101680118 B1 KR 101680118B1
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South Korea
Prior art keywords
friction
fluid
case
shaft
protrusions
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KR1020160013846A
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Korean (ko)
Inventor
오영한
Original Assignee
성보전기공업 주식회사
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Priority to KR1020160013846A priority Critical patent/KR101680118B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
    • F24H1/101—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium using electric energy supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
    • F24H1/101—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium using electric energy supply
    • F24H1/102—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium using electric energy supply with resistance
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/02—Casings; Cover lids; Ornamental panels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/18—Arrangement or mounting of grates or heating means
    • F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H2250/00—Electrical heat generating means
    • F24H2250/02—Resistances

Abstract

The present invention relates to a fluid pump electric boiler, and its object is to provide a fluid pump electric boiler which enables smooth fluid flow through the improvement of the structure of the friction head. The present invention for this purpose comprises a base frame; A burner mounted on the base frame to heat the fluid; And a motor mounted on the base frame and connected to a friction head provided inside the case, wherein the friction head has an inflow space formed therein for inflow of a fluid to be introduced into the case, A body portion having a shaft coupling portion to which a connecting shaft extending is coupled; The body portion is divided by the friction groove portion in the circumferential direction of the body portion. The body portion is divided by the friction groove portion in the longitudinal direction of the body portion, And a plurality of second friction protrusions disposed between the first friction protrusions, the plurality of first friction protrusions being divided by the ring-shaped groove portion along the circumferential direction, and at least one of the rubbing protrusions And the front side surfaces of the first and second frictional protrusions located in the front region and the rear region of the body portion of the first frictional projection and the second frictional projection are respectively concave and convex from the frictional groove portion So that the front edge forms a hook structure protruding in the rotational direction of the friction head. Lt; / RTI >

Figure R1020160013846

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid pump electric boiler, and more particularly, to a fluid pump electric boiler provided with a head rotating at a high speed inside a case, Electric boiler.

Generally, a boiler burns fuel such as petroleum, coal, and gas, heats fluid such as water or heat oil using the heat of combustion generated when the fuel is burned, or uses heat to heat fluid such as water or heat oil .

These boilers are widely used in industrial fields requiring heating fluid as well as in heating homes and buildings.

On the other hand, boilers using chemical fuels such as petroleum, coal, and gas have a problem in that a large amount of pollutants are discharged during the combustion process of chemical fuels, and the thermal efficiency is lower than that of the spent chemical fuels.

A boiler for heating fluid using electricity is an electric heating system using electric resistance, and a friction heating system for generating heat through fluid flow.

The boiler of the electric heating system has a problem that there is always a risk of electric leakage or fire depending on the nature of the fluid and it takes a lot of time to heat a large amount of fluid because the fluid can be heated only in the vicinity of the heating wire which generates heat by resistance.

Recently, there is an increasing interest in a friction heating type boiler in which a fluid is flowed by using electric energy and a fluid is directly heated by the flow of the fluid.

The frictional heating boiler heats the fluid through friction, cavitation, etc. of the fluid, and it is important to increase the fluid flow rate and the turbulent flow to promote the heating.

Meanwhile, the conventional friction heating type boiler includes a case having a fluid inlet and a fluid outlet, and a friction head installed to rotate inside the case. The friction head is rotated between the friction head and the case The fluid is heated by friction.

In the conventional friction-heating boiler as described above, the fluid filled in the space between the friction head and the case is heated. If the space is too wide, the frictional amount of the fluid is low and the heating is not properly performed. There is a problem that it takes a lot of time to heat a large amount of fluid because the fluid amount is small.

Accordingly, although a plurality of wings are formed on the outer periphery of the friction head to increase the friction area with the fluid, it has not provided sufficient turbulence flow and fluid friction and flow velocity for raising a large amount of fluids.

In view of the above problems, an improved triboelectric boiler head is disclosed in Japanese Patent Publication No. 1535509, and FIG. 1 is a sectional view of a boiler constructed using the triboelectric boiler head.

The head 10 disclosed in the patent document is composed of a body portion 11 and a friction projection portion 12 and has a structure that is connected to a motor not shown through a rotary drive shaft 30 and rotates.

The body portion 11 has a cylindrical shape with one side opened and the opened side portion is connected to the fluid inlet 21 formed in the case 20 so that the inflow of the fluid into the inside of the head 10 The cover 40 having the inlet hole 41 is formed and the rotary drive shaft 30 is connected to a side opposite to the side where the cover 40 is coupled.

An impeller 51 for guiding the flow of the fluid is formed in the inside of the head 10. More specifically, one impeller 51 is provided on a side surface of the side surface of the cover 40, And one impeller 52 is formed on the inner surface of the body portion 11. [

Conventionally, the impellers 51 and 52 are respectively formed on the side surface of the cover 40 and the inner surface of the body portion 11 as described above. After the impeller is manufactured through a separate processing step, And the impeller is fixed to the inner surface of the body portion.

However, since the impeller rotates at a high speed in order to flow the fluid, there is a problem that vibration and noise are generated due to deterioration of fixation force with time.

The rotary drive shaft 30 is coupled to the head 10 through one side surface of the case 20 and rotates at a high speed for rotation of the head 10. The inside of the case 20 is connected to the head 10, A stable watertight structure is indispensably required between the rotary drive shaft 30 and the case 20 since it is filled with the fluid that has been raised by the rotation of the impeller 51 and impellers 51 and 52. [

Therefore, a hermetic member such as a mechanical seal is installed between the rotary drive shaft 30 and the case 20 in order to realize a stable watertight structure.

Although FIG. 1 does not show a state in which the hermetic member is installed, it can be seen that the head 10 and the case 20 are spaced apart from each other in order to secure a space for installing the hermetic member.

As the gap between the head 10 and the case 20 increases for the installation of the hermetic member as described above, the volume of the space S surrounding the connection portion between the head 10 and the rotary drive shaft 30 increases in proportion thereto do.

The space S formed around the connection portion between the head 10 and the rotary drive shaft 30 unnecessarily increases the volume of the heating space to increase the amount of fluid flowing into the casing at a time, It will interfere.

In addition, the fluid stagnates in the space S while forming a vortex, and thus the fluid stagnated in the space S acts as an element for reducing the pressure of the fluid discharged through the outlet 22. [

The space S generated by installing the hermetic member between the rotary drive shaft and the case hinders effective heating of the fluid and causes a pressure loss of the fluid, thereby reducing the efficiency of the electric boiler.

In addition, in the case of the electric boiler shown in Fig. 1, since the bearing supporting the rotation of the head is directly exposed in the space where the fluid is heated, when the bearing is used for heating the general water rather than the heat medium oil, It can be easily damaged.

Therefore, in the case of the electric boiler shown in FIG. 1, a general bearing can not be used, and it is required to use a bearing made of a special material such as a ceramic bearing, but the ceramic bearing has a problem in that it is less durable than a general bearing.

Patent Registration No. 1535509 (Announcement of Jul. 2015)

It is an object of the present invention to provide a fluid pump electric boiler capable of smooth fluid flow through a structure improvement of a friction head.

Another object of the present invention is to provide a fluid pump electric boiler which can minimize the unnecessary space inside the case to realize more effective frictional heating of the fluid.

It is still another object of the present invention to provide a fluid pump electric boiler for improving the structure of an impeller to reduce noise and vibration caused by an impeller.

According to an aspect of the present invention, there is provided a base frame comprising: a base frame; A burner mounted on the base frame for heating a fluid flowing through the inlet while the friction head rotates in a heating space inside the case having an inlet and an outlet for the fluid; And a motor mounted on the base frame so as to be positioned adjacent to the burner and axially coupled to the friction head to rotate the friction head, wherein the friction head is disposed parallel to the inlet, A body portion formed with an inflow space into which a fluid to be introduced into the inside flows, and a shaft coupling portion to which a connection shaft extending from the motor is coupled; A plurality of frictional grooves formed along the circumferential direction of the body and spaced apart from each other along a longitudinal direction of the body, the frictional grooves being divided by a plurality of frictional grooves along the circumferential direction of the body, And a plurality of second friction protrusions spaced apart from the first friction protrusions and protruding lower than the height of the first friction protrusions, the plurality of first friction protrusions being divided by a plurality of ring- Wherein at least one of the friction protrusions is formed with a discharge hole communicated with the inflow space, and the first friction protrusions and the second friction protrusions are disposed in the front region and the rear region of the body portion, respectively, The front side surfaces of the friction protrusions and the second friction protrusions are recessed more concave from the friction grooves so that the front side edge is inclined in the rotational direction of the friction head Being configured to form a projecting hook structure, the case is composed of a front and a rear of the cylindrical structure is opened, the housing is formed on the outlet side; The inlet port for the installation of the end shaft and the inflow of the fluid is formed in the center, and a rear surface facing the heating space is connected to the front surface of the housing to close the open front surface of the housing by the rotation of the friction head A front cover member having a plurality of third flow grooves spaced apart from each other in the circumferential direction, the plurality of third flow grooves having an arc-shaped structure bent in the rotational direction of the friction head to assist flow of the fluid; And a coupling shaft extending from the motor and coupled to a rear surface of the housing so as to close the open rear surface of the housing, and a shaft hole for installing the mechanical seal through the center portion, And a rear cover member protruding to the inside of the heating space to surround the shaft coupling part and including a filling part for filling a space between the shaft coupling part and the case.

The fluid pump electric boiler may further include an oil pump disposed on a rear surface of the shaft coupling unit to allow the fluid around the shaft coupling unit to rotate when the friction head rotates and to have a structure spaced apart from each other in a circumferential direction of the shaft coupling unit, A plurality of flow guide grooves may be further formed.

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A plurality of first induction grooves formed in a front surface of the filler portion and formed in a circular arc structure bent in a rotational direction of the friction head; And a plurality of second guide grooves formed on an inner circumferential surface of the shaft hole and formed in a helical structure extending along the rotational direction of the friction head.

The fluid pump electric boiler is provided with a flow path which is coupled to the front of the friction head to rotate together with the friction head and which flows the fluid flowing through the inlet to the inflow space, An end shaft having a plurality of first blades projecting integrally on a rear surface thereof to form a vortex; And an impeller installed at an end of the connecting shaft to rotate inside the inflow space and having a plurality of second blades protruding integrally on the front surface to form a second vortex of the flow opposing the first vortex .

The fluid pump electric boiler further includes a bearing block installed at a rear end of the case to support the rotation of the connecting shaft, wherein a plurality of spacers are provided between the bearing block and the case, .

In the fluid pump electric boiler, each of the spacers may have a cylindrical shape with a hole through which a bolt fastened to fix the bearing block to the case is formed at the center.

According to the present invention having such characteristics as described above, heat generated by friction between fluid molecules through rotation of a friction head disposed in a heating space and heat generated when bubbles are decomposed due to acceleration / decompression and deceleration / pressure increase of fluid through centrifugal force Thereby providing a high heating efficiency in such a manner that the fluid itself is heated, and the fluid in the heating space can be smoothly discharged without stagnation and discharged.

In addition, the present invention minimizes unnecessary space in the heating space, thereby further enhancing the heating efficiency of the fluid.

In addition, the present invention has an effect that the blade for generating a vortex for the flow of fluid is processed into an integral structure in the related member, so that occurrence of noise or vibration due to the blade can be reduced.

Further, the present invention is effective in reducing heat generated by the fluid heated in the case to be transmitted to bearings or motors supporting the connection shaft, thereby shortening the service life of bearings or motors due to heat.

Further, the present invention minimizes the interval between the bearing block supporting the rotation of the connecting shaft and the flange coupling connecting the connecting shaft and the rotating shaft, thereby reducing the total volume of the fluid pump electric boiler.

1 is a cross-sectional view of a conventional fluid pump electric boiler,
2 is a perspective view of a fluid pump electric boiler according to a preferred embodiment of the present invention,
3 is a perspective view of a base frame according to the present invention,
4 is an exploded perspective view showing the structure of a burner according to the present invention,
5 is a cross-sectional view of a burner according to the present invention,
6 is a perspective view of a housing according to the present invention,
7 is a perspective view of a front cover member according to the present invention,
8 is a perspective view of a rear cover member according to the present invention,
9 and 10 are perspective views of a friction head according to a preferred embodiment of the present invention,
11 is a side view of a friction head according to a preferred embodiment of the present invention,
12 is a sectional view taken along line AA 'in Fig. 11,
13 is a cross-sectional view of BB 'of FIG. 11,
14 is a sectional view of CC 'in Fig. 11,
15 is a perspective view of an end shaft according to a preferred embodiment of the present invention,
16 is a perspective view of an impeller according to a preferred embodiment of the present invention,

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

The fluid pump electric boiler according to the present invention heats the fluid flowing into the inside of the case through the rotation of the friction head rotating at a high speed, and is used for heating equipment such as a heating coil, a fan, and a radiator, To the fluid heating device.

For reference, the fluid may be water or heat medium oil, and the fluid pump electric boiler according to the preferred embodiment of the present invention has an ideal structure for heating water.

Figure 2 shows a perspective view of a fluid pump electric boiler according to a preferred embodiment of the present invention.

The fluid pump electric boiler according to the present invention used for heating water or thermal oil as described above is composed of a base frame 10, a burner 20, and a motor 30.

3 is a perspective view of a base frame according to the present invention.

The base frame 10 has a rectangular planar structure, and a first mounting portion 11 on which a burner is mounted and fixed, and a second mounting portion 12 on which a motor is mounted and fixed.

The base frame 10 is provided at its lower end with a plurality of dust-collecting openings 13 for relieving the vibrations generated during the operation of the motor 30 from being transmitted to the bottom.

5 is a cross-sectional view of a burner according to the present invention, FIG. 6 is a perspective view of a housing according to the present invention, FIG. 7 is a front view of a front cover member according to the present invention, 8 is a perspective view of a rear cover member according to the present invention.

The burner 20 is a part for heating and heating the fluid and includes a case 100 and a friction head 200. The inside of the case 100 rotates the friction head 200 at a high speed, And a structure for heating the fluid flowing into the case 100 together with the fluid.

The case 100 includes a housing 110, a front cover member 120, and a rear cover member 130.

The housing 110 has a cylindrical structure with the front and rear openings. The interior of the housing 110 is used as a heating space HS. An outlet 111 through which the heated fluid is discharged from the heating space HS, .

The housing 110 is formed with a plurality of friction ribs 112 protruding from the inner circumferential surface thereof and extending in the longitudinal direction of the housing 110 and having a structure spaced apart from each other along the circumferential direction of the housing 110 .

The friction ribs 112 collide with and friction with fluids rotating inside the case 100 by the rotation of the friction head 200, thereby promoting heating of the fluid.

A thermometer installation hole 113 is formed in the vicinity of the outlet 111 to provide a thermometer for detecting the temperature of the fluid inside the case 100.

The front cover member 120 is coupled to the front surface of the housing 110 so as to close the opened front face of the housing 110. The front cover member 120 has an inlet 123 through which the fluid flows, And a plurality of third flow grooves 124 are formed on the rear surface 121a for facilitating the flow of the fluid flowing in the first and second flow passages 121a and 121b.

More specifically, the front cover member 120 includes a fixing portion 122 formed at the rear end of the front cover member 120 to be inserted into the housing 110 and fixed to the front surface of the housing 110 by a plurality of bolts, And an inlet 123 through which the fluid is introduced and a space for installing an end shaft to be described later is provided at a central portion of the insertion portion 121 and the fixing portion 122.

The rear surface 121a of the insertion portion 121 facing the front surface of the friction head 200 has an arc-shaped structure bent in the rotational direction of the friction head 200, A plurality of third guide grooves 124 having a structure spaced apart from each other in the circumferential direction of the front cover member 120 are formed on the rear surface 121a.

The third guide groove 124 has a structure bent in the same direction as the fluid flowing inside the heating space TS by the rotation of the friction head 200 to help the fluid flow.

Since the end shaft 240 to be described later is coupled to the rear end of the inlet port 123 formed at the center of the front cover member 120, the bearing for smooth rotation of the end shaft 240, A sealing member is provided at the rear end of the inflow port 123. [

In addition, a female screw fastened to a socket (not shown) for coupling with a hose or a pipe to which a fluid is supplied is formed in a front end portion of the inlet 123.

The rear cover member 130 is coupled to the rear surface of the housing 110 to close the open rear surface of the housing 110 and includes a fixing part 131 fixed to the rear surface of the housing 110 by a plurality of bolts, And is inserted into the housing 110 while being protruded forward from the fixing portion 131. The shaft coupling portion 211 is spaced apart from the shaft coupling portion 211 of the friction head 200, And a filling part 132 for filling the space between the shaft coupling part 211 and the housing 110 while enclosing the space.

The connecting shaft 40 penetrates the central portion of the rear cover member 130 composed of the fixing portion 131 and the filling portion 132 and the fluid is prevented from flowing out between the connecting shaft 40 and the connecting shaft 40. [ And a shaft hole 133 on which the cognitive seal is installed is formed so as to pass through the front and rear surfaces.

The front surface 132a of the filling part 132 and the inner circumferential surface 133a of the shaft hole 133 are provided with a first guide groove 134 for guiding the peripheral fluid to flow toward the front of the heating space HS, An induction groove 135 is further formed.

A plurality of first guide grooves 134 are formed in the front surface 132a of the filler 132 and a plurality of first guide grooves 134 are formed in the circumferential direction of the filler 132, . ≪ / RTI >

Each of the first guide grooves 134 is formed as a groove having a predetermined depth from the front surface 132a of the filler 132 and has a circular structure bent in the rotational direction of the friction head 200. [

A plurality of second guide grooves 135 are formed in the inner circumferential surface 133a of the shaft hole 133 and a plurality of second guide grooves 135 are formed to be spaced apart from each other in the circumferential direction of the shaft hole 133 .

Each of the second guide grooves 135 is formed as a groove having a predetermined depth from the inner circumferential surface of the shaft hole 133 and has a helical structure extending in the rotational direction of the friction head 200.

The first guide groove 134 and the second guide groove 135 formed in the rear cover member 130 are formed at the periphery of the shaft hole 133 and the filler 132 by the rotation of the friction head 200, The function of guiding the fluid flowing in the same direction as the rotating direction of the friction head 200 to the front side of the heating space HS is provided.

As described above, the case 100 formed of the housing 110, the front cover member 120, and the rear cover member 130 is preferably sealed so that the fluid flowing into the housing 110 is not leaked.

In addition, it can be made of a material such as metal or reinforced plastic that can withstand the high-speed rotation of the friction head 200 and the connecting shaft 40. When the fluid is water, it is made of stainless steel having high corrosion resistance, Is preferably made of steel or the like having high strength in the case of oil such as thermal oil or vapor.

Fig. 9 is a perspective view of a friction head according to a preferred embodiment of the present invention, Fig. 11 is a side view of a friction head according to a preferred embodiment of the present invention, Fig. 12 is a cross- 13 is a sectional view of BB 'in FIG. 11, and FIG. 14 is a sectional view of CC' in FIG.

The friction head 200 is disposed in the heating space HS formed inside the case 100 and connected to the motor 30 via the connection shaft 40 to be introduced into the heating space HS, Thereby heating the fluid.

The friction head 200 for providing such a function includes a body 210 and a friction protrusion 220 formed of a plurality of friction protrusions protruding from the outer circumferential surface of the body 210.

The body 210 has a cylindrical shape with an open front, and a shaft coupling part 211 is formed at the rear end of the body part 210 to be coupled with the coupling shaft 40.

The inflow space IS is disposed in parallel with the inflow opening 123 formed in the case 100. The inflow space IS is formed in the inside of the body 210 having the cylindrical structure with the open front, The fluid flowing into the interior of the case 100 flows through the through hole 123.

An assembly hole 2111 for assembling the connection shaft 40 is formed in the shaft coupling portion 211 and the center portion of the shaft coupling portion 211 is connected to the body portion 210, And the connection shaft 40 is inserted into the assembly hole 2111. The connection shaft 40 is inserted into the assembly hole 2111 through a key, And is coupled to the coupling portion 211 to rotate together with the shaft coupling portion 211, that is, the body portion 210.

It is preferable that the center line of the body portion 210 and the center line of the heating space HS coincide with the center line of rotation of the connecting shaft 40.

According to a preferred embodiment of the present invention, a plurality of flow guide grooves 2112 are further formed on the rear surface 211a of the shaft coupling portion 211. [

More specifically, the flow guide groove 2112 is a groove machined to a predetermined depth from the rear surface 211a of the shaft coupling portion 211 so as to have a structure extending from the rotation center of the friction head 200 to a radial structure A plurality of flow guide grooves 2112 are formed on the rear surface 211a of the shaft coupling portion 211 and are spaced apart from each other in the circumferential direction of the shaft coupling portion 211. [

The flow guide groove 2112 thus formed rotates together with the rotation of the friction head 200 to flow the fluid around the rear surface 211a of the shaft coupling portion 211, The fluid flows along the rotating current formed inside the heating space TS so that the fluid remains around the shaft coupling part 211 having a relatively small fluid flow amount, Can be prevented.

When the friction head 200 rotates, the friction protrusions 220 generate heat due to frictional or collision between fluid molecules, bubbles due to acceleration / decompression and deceleration / ) And heat due to viscous friction.

The friction protrusions 220 include a first friction protrusion 221 and a second friction protrusion 222.

The first friction protrusions 221 are formed to have a structure protruding from the outer circumferential surface of the body portion 210 and are spaced apart from each other along the circumferential direction of the body portion 210 and along the longitudinal direction of the body portion 210 As shown in FIG.

More specifically, the first rubbing protrusions 221 are formed to have a plurality of mutually spaced structures along the circumferential direction of the body portion 210, and between the two first rubbing protrusions 221 adjacent to the circumferential direction Two friction grooves 223 and one second friction protrusion 222 are formed to divide the two neighboring first friction protrusions 221.

That is, a friction groove portion 223, a second friction projection 222, and a friction groove portion 223 are sequentially formed along the circumferential direction of the body portion 210 between two neighboring first friction protrusions 221.

For reference, the friction groove portion 223 may be a groove recessed from the outer circumferential surface of the body portion 210 to have a semicircular sectional structure.

The first friction protrusions 221 are formed to have a plurality of spaced apart structures along the longitudinal direction of the body portion 210. Between the two first friction protrusions 221 adjacent to the longitudinal direction, So that the two first friction ribs 221 adjacent to each other in the longitudinal direction are divided.

The ring groove portion 224 is a groove formed in a ring shape extending in the circumferential direction of the body portion 210 between two adjacent first friction protrusions 221 in the longitudinal direction of the body portion 210 The ring-shaped groove portion 224 has a function of dividing two first friction ribs 221 and a second friction rib 222 which are adjacent to each other in the longitudinal direction of the body portion 210, Thereby providing a function of increasing the area and inducing smooth fluid flow during rotation of the friction head 200.

The first rubbing protrusion 221 protruding from the outer circumferential surface of the body 210 as described above is formed so that the rear edge 221-1 of the rubbing head 200 is sloped or rounded And the front end edge 221-2 is formed to be sharp.

The second friction protrusions 222 are disposed to be positioned between two first friction protrusions 221 adjacent to each other in the circumferential direction of the body portion 210 as described above, 1 friction protrusion 221 as shown in Fig. The first rubbing protrusions 221 and the second rubbing protrusions 222 are disposed alternately in the circumferential direction on the outer circumferential surface of the body portion 210. That is, the first friction rib 221, the friction rib 223, the second friction rib 222, and the frictional groove 223 are repeatedly formed along the circumferential direction of the body 210 in this order.

The second friction protrusions 222 are formed to protrude from the outer circumferential surface of the body 210 and protrude to a height lower than the height of the first friction protrusions 221. The first friction protrusions 221 and the second friction protrusions 222 disposed on both sides of the friction groove portion 223 are formed to have different heights when viewed from the one friction groove portion 223.

The second frictional projection 222 is formed in a sloped or rounded shape at the rear end side edge 222-1 with respect to the rotational direction of the friction head 200. The front end side edge 222-2 is formed into a sharp do.

As described above, the friction head 200 having the first friction rib 221, the second friction rib 222, the frictional groove 223, and the ring groove 224 formed on the outer surface of the body 210, The fluid that has flowed into the heating space HS during rotation of the friction head 200 flows in the rotating direction of the friction head 200 and the first friction protrusion 221 and the case 100, The fluid is compressed in a narrow space between the friction protrusions 222 and the case 100 and the fluid is compressed in the wide space between the friction grooves 223 and the case 100 and between the ring groove 224 and the case 100. [ Is expanded.

By repeating the compression and expansion of the fluid, the momentum of the fluid molecule is increased and the frequency of friction between the fluid molecules is increased, so that the self-heating of the fluid can be promoted.

As described above, the fluid introduced into the heating space HS is not indirectly heated by the combustion of the chemical fuel or the resistance heating of the heating wire, but the bubbles decomposed by acceleration / decompression and deceleration / It is possible to generate heat by self-heating due to friction between the fluid and the fluid at the time of heating, thereby providing a high heating efficiency.

According to a preferred embodiment of the present invention, at least one of the first friction protrusion 221 and the second friction protrusion 222 communicates with the inflow space IS of the body 210, A discharge hole 230 is formed.

The discharge hole 230 includes a first discharge hole 231 and a second discharge hole 232. The first discharge hole 231 is formed in the first friction protrusion 221, The hole 232 is formed in the second friction protrusion 222.

The first discharge hole 231 is formed to extend from the inflow space IS to the surface of the first friction protrusion 221 and the second discharge hole 232 is extended from the inflow space IS to the second friction And extends to the surface of the projection 222. [

The discharge hole 230 formed by the first discharge hole 231 and the second discharge hole 232 may include a first rubbing protrusion 221 and a second rubbing protrusion 221 located at the front and rear ends of the body 210, 222 are formed on the first and second frictional projections 221, 222, respectively.

For example, FIG. 9 shows a structure in which the friction protrusions 220 are formed in an eight-step structure in the longitudinal direction of the friction head 200. The friction protrusions 220 are formed on the friction surface of the body 210, The first discharge hole 231 and the second discharge hole 232 are formed in the second, third, fourth, fifth, and sixth friction ridge portions except for the seventh and eighth ridge portions formed at the rear of the portion 210 Respectively.

The fluid discharged through the first discharge hole 231 formed in the first friction protrusion 221 protruded relatively high and the second discharge hole 232 formed in the second friction protrusion 222 protruded relatively low, Is caused to collide with the inner peripheral surface of the case 100 with a time lag.

That is, as the first discharge hole 231 formed in the first rubbing projection 221 is closer to the inner peripheral surface of the case 100, the fluid discharged through the first discharge hole 231 flows at a relatively high speed And the second discharge hole 232 formed in the second friction protrusion 222 at the lower end is located at a relatively long distance from the inner circumferential surface of the case 100, 232 collide against the inner circumferential surface of the case 100 relatively later as the fluid is decelerated greatly in the process of flowing toward the inner circumferential surface of the case 100. [

As the collision between the case 100 and the fluid ejected from the discharge hole 230 of each of the friction protrusions is intermittently generated at a constant time interval, the wear that may occur as the case 100 continuously collides with the fluid The damage and fracture phenomenon can be minimized and the durability of the product can be improved.

Since the first friction protrusions 221 and the second friction protrusions 222 protrude from the outer circumferential surface of the body portion 210 at different heights along the circumferential direction, The fluid is repeatedly expanded and compressed according to the change in the distance between the first friction protrusion 221 and the case 100 and between the second friction protrusion 222 and the case 100 to increase the momentum of the fluid molecules . Accordingly, since the fluid can emit a large amount of energy, the temperature can be raised more rapidly than when the friction protrusions are all formed with the same step.

According to a preferred embodiment of the present invention, the first friction protrusions 221 are formed so as to communicate with the first discharge holes 231 and extend to the front and rear surfaces of the first friction protrusions 221, And a third discharge hole 233 for allowing the ejection of additional fluid to be further formed may be further formed on the first friction ribs 221.

The second friction protrusions 222 are formed so as to extend to the front and rear surfaces of the second friction protrusions 222 so as to discharge the additional fluid through the front and rear surfaces of the second friction protrusions 222, The discharge hole 234 may be further formed in a part of the second friction protrusion 222.

According to the third discharge hole 233 and the fourth discharge hole 234 as described above, the fluid ejected to the front and rear surfaces of the first friction protrusion 221 through the third discharge hole 233, A part of the fluid ejected to the front and rear surfaces of the second friction protrusion 222 through the pinion gear 234 collides with the fluid that rotates in the friction groove part 223, 1 rubbing protrusion 221 or the second rubbing protrusion 222, as shown in Fig.

In such a collision, the fluid is heated through the energy release of the fluid molecules, and turbulent flow during collision can be induced to increase the momentum of the fluid molecule.

According to a preferred embodiment of the present invention, the first rubbing protrusion 221 of some of the first rubbing protrusions 221 may further include a flow through hole 235 and a centrifugal discharge hole 236, According to the preferred embodiment of the present invention, the first through-hole 231 and the centrifugal discharge hole 236 are formed in the first friction protrusion 221 where the first discharge hole 231 of the first friction protrusion 221 is not formed, .

The flow through hole 235 has a structure penetrating the first friction protrusion 221 and is formed to penetrate the first friction protrusion 221 in the circumferential direction of the body portion 210.

The centrifugal discharge hole 236 is formed to extend from the flow through hole 235 to the surface of the first friction protrusion 221 and is exposed to the surface of the first friction protrusion 221, 221).

According to the above-described flow through hole 235 and the centrifugal discharge hole 236, when the friction head 200 rotates, a part of the fluid on the rotation-facing surface side of the first friction protrusion 221 flows into the flow through hole 235 A part of the fluid that flows into and flows into the flow through hole 235 is discharged to the rear surface of the first friction protrusion 221 and the rest is discharged through the centrifugal discharge hole 236 to the first friction protrusion 221).

Meanwhile, the fluid flowing into the flow through hole 235 is accelerated / depressurized, is discharged from the flow through hole 235, and is decelerated / boosted.

The heating of the fluid can be promoted through bubbling and bubbling due to the acceleration / decompression of the fluid and the bubbling process accompanying the deceleration / pressure increase.

Meanwhile, the fluid discharged through the centrifugal discharge hole 236 by the centrifugal force due to the rotation of the friction head 200 repeatedly collides with the inner circumferential surface of the case 100, thereby generating heat energy.

The diameter of the centrifugal discharge hole 236 is preferably smaller than the diameter of the flow through hole 235.

According to the preferred embodiment of the present invention, among the entire first rubbing protrusions 221 and the second rubbing protrusions 222, the first rubbing protrusions 221 located in the front region and the rear region of the body portion 210, respectively, And the front side surfaces 221a and 222a of the second friction protrusion 222 are recessed more concave from the friction grooves 223 so that the front side edge 221-2 of the first friction protrusion 221 and the front side edge 221-2 of the second friction protrusion 222 So that the front side edge 222-2 of the pinion 222 further projects in the rotational direction of the friction head 200 to form a hook structure.

The front region and the rear region of the body 210 mentioned above divide the entire region where the first rubbing protrusion 221 is formed in the longitudinal direction of the body portion 210, The rear region means a region of the rear end portion close to the shaft coupling portion 211 and the range of the front region and the rear region is a region of the front end portion located near the inlet 123 formed in the friction portion 211, (200).

For example, FIG. 9 shows a structure in which a hook structure is formed on one of the friction protrusions on the first stage located at the front of the body 210 and the eight friction protrusions located on the rear side of the body 210. However, depending on the size of the friction head 200, And a hook structure is formed on the friction protrusions constituting the first and second stages and the rear and first and second stages.

As described above, the hook structure formed on the first friction protrusion 221 functions to push the fluid on the opposite side of the rotation direction of the corresponding friction protrusion to the other friction protrusion more strongly when the friction head 200 rotates The hook structure providing such a function is formed on the friction protrusions formed in the front region and the rear region of the body portion 210 located relatively far from the outlet 111 formed in the case 100, The fluid located far from the outlet 111 can be smoothly discharged through the outlet 111. In this case,

The friction head 200 configured as described above can be made of reinforced plastic, stainless steel, steel, or the like.

The impeller 250 may further include an end shaft 240 that induces the flow of the fluid while rotating together with the friction head 200 including the body 210 and the friction protrusions 220.

FIG. 15 is a perspective view of an end shaft according to a preferred embodiment of the present invention, and FIG. 16 is a perspective view of an impeller according to a preferred embodiment of the present invention.

The end shaft 240 is disposed to be positioned in front of the friction head 200 and is in contact with the friction head 200 in front of the friction head 200. The end shaft 240 is in close contact with the friction head 200, To rotate together with the friction head (200). 15 shows a structure in which a groove 244 is formed on the rear surface 240a of the end shaft 240. In Fig. 10, a protrusion 201 inserted into the groove 244 is inserted into the friction head 200 are shown protruding from the front surface.

More specifically, the end shaft 240 is formed with a flow path 241 extending in the longitudinal direction at the center and connecting the inlet 123 to the inflow space IS, A flange portion 242 coupled to the friction head 200 by projections and grooves is protruded.

A plurality of first blades 243 are formed in the rear surface 240a of the end shaft 240 to form a first vortex W1 in the inflow space IS while rotating in the inflow space IS Respectively.

The plurality of first blades 243 are spaced apart from each other along the circumferential direction of the end shaft 240 from the rear surface 240a of the end shaft 240, The peripheral fluid is formed to flow toward the connecting shaft 40, that is, to the rear end of the inflow space IS while forming the first vortex W1 of the spiral.

The first blade 243 is preferably formed integrally with the end shaft 240 when the end shaft 240 is manufactured.

The end shaft 240 configured as described above is mounted in a rotatable structure at the rear end of the inlet 123 formed in the front cover member 120, as described above.

The impeller 250 is fixed to an end of a connecting shaft 40 protruding to the inside of the inflow space IS through the assembly hole 2111 formed in the shaft coupling part 211 with a bolt, And a plurality of second blades 251 are formed on the front surface 250a facing the end shaft 240. [

The plurality of second blades 251 are spaced apart from each other in the circumferential direction of the impeller 250 from the front surface 250a of the impeller 250. When the impeller 250 rotates, Is formed to flow toward the end shaft 240, that is, to the front end of the inflow space IS while forming the second vortex W2 of the flow opposed to the first vortex W1.

According to the end shaft 240 and the impeller 250 as described above, by the first vortex W1 formed at the tip of the inflow space IS when the end shaft 240 rotates, the fluid flows into the inflow space IS As the pressure inside the flow path 241 formed in the end shaft 240 is lowered due to the flow of the fluid, the fluid at the inlet 123 side flows into the flow path 241 of the end shaft 240 ) Into the inflow space (IS).

As a result, the fluid introduced into the inflow space IS by the rotation of the end shaft 240 is compressed by the spiral flow that is rotated along the inner circumferential surface of the body portion 210 forming the inflow space IS, And discharged to the discharge hole (230).

The second vortex W2 formed by the impeller 250 further lowers the pressure of the central portion of the inflow space IS to promote the inflow of the fluid and promotes the pressurized discharge of the fluid through the discharge hole 230 Function.

Accordingly, by forming the first vortex W1 and the second vortex W2 in the inflow space IS through the additional configuration of the end shaft 240 and the impeller 250 that rotate together with the friction head 200 , It becomes possible to introduce and discharge the fluid without using a separate pump, thereby simplifying the structure of the related equipment constituted by using the fluid pump electric boiler.

2, 3 and 5, the motor 30 is mounted on a second mounting part 12 provided on the base frame 10 so as to be positioned adjacent to the burner 20, And is connected to the friction head 200 to rotate the friction head 200.

The rotary shaft 31 and the connecting shaft 40 of the motor 30 are coupled to each other through a flange coupling 50 for stable power transmission and connected to the rotary shaft 31 using the flange coupling 50. [ The coupling of the shaft 40 is achieved by coupling the first flange 51 constituting the flange coupling 50 to the rotary shaft 31 and coupling the second flange 52 to the connecting shaft 40, (51) and the second flange (52) with bolts and nuts.

The bearing block 140 that supports the connecting shaft 40 is provided at the rear end of the case 100 so that the connecting shaft 40 for transmitting the rotational force of the motor 30 to the friction head 200 can be stably rotated, As shown in FIG.

The bearing block 140 includes a bearing housing 141 and a bearing cover 142.

The bearing housing 141 is formed with a through hole 1411 through which the connecting shaft 40 passes, a bearing supporting the rotation of the connecting shaft 40 in the through hole 1411, A sealing member is provided to prevent the injected lubricant from flowing out.

The bearing housing 141 is fixed to the rear surface of the case 100 by a plurality of bolts.

According to a preferred embodiment of the present invention, in order to minimize the heat generated from the heated fluid in the case 100 to be transmitted to the bearings provided in the bearing block 140 or the motor 30, And the spacing structure is implemented by a plurality of spacers 150.

More specifically, the spacer 150 has a cylindrical shape with a hole through which bolts fastened to fix the bearing housing 141 to the case 100 are formed at the center, and the front end is formed in the rear cover member 130 And the rear end is inserted and seated in the second seating groove 1412 formed in the bearing housing 141. The bearing housing 141 is spaced apart from the spacer 150 and the rear cover 140. [ And is fixed by bolts fastened to the housing 110 through the member 130.

It is preferable that the spacer 150 is made of a material having a low thermal conductivity in order to minimize heat transfer to the bearings or the motor 30.

The bearing cover 142 is installed in close contact with the rear surface of the bearing housing 141 so that the bearing installed inside the bearing housing 141 can be operated in a closed space. 141).

The bearing cover 142 is provided with a lubricant supply passage for supplying lubricant to the bearing and a sealing member for preventing the lubricant from flowing out to the connection shaft 40 is provided.

The process of heating the fluid by the operation of the fluid pump electric boiler according to the present invention constructed as described above will be described.

The inlet port 123 formed on the front surface of the case 100 is connected to the fluid supply source and the outlet port 111 formed on the side surface of the case 100 can be connected to the heating fluid usage facility, The supply source and the use facility are constituted by one tank, and the fluid stored in the tank is circulated to the inside of the case 100 and heated to a temperature required for use, and the tank and the use facility are connected.

In the fluid pump electric boiler according to the present invention, the rotational force generated by the motor 30 is transmitted to the connecting shaft 40, the friction head 200, the impeller 250, and the end shaft 240, , And fluid flow and heating are performed by rotation of these components.

More specifically, the first vortex W1 and the second vortex W2 are formed in the inflow space IS by the rotation of the end shaft 240 and the impeller 250, and the first vortex W1 The fluid in the inflow space IS is discharged through the first and second discharge holes 231 and 232 to the outside of the friction head 200 by the second vortex W2, And the discharge and inflow of the fluid are continuously and continuously performed in the course of the rotation of the end shaft 240 and the impeller 250.

A part of the fluid discharged from the inflow space IS through the first discharge hole 231 and the second discharge hole 232 is discharged through the first discharge hole 231 and the second discharge hole 232 And the remaining part is discharged to the front and rear surfaces of the first friction protrusion 221 through the first discharge hole 231 or to the front and rear surfaces of the second friction protrusion 222 through the fourth discharge hole 234 .

The fluid discharged through the first and second discharge holes 230 collides against the inner circumferential surface of the case 100 but collides with each other due to a difference in height between the first and second friction protrusions.

A part of the fluid discharged through the third and fourth discharge holes 230 collides with the fluid that rotates in the friction groove portion 223 and the other portion of the fluid is discharged through the first friction protrusion 221 And the second friction protrusions 222, respectively.

The gap between the friction head 200 and the case 100 is repeatedly changed due to the first and second friction protrusions having a height difference during rotation of the friction head 200. As a result, the fluid repeatedly expands and compresses So that the momentum of the fluid molecule is increased, thereby allowing rapid heating of the fluid.

Further, energy collision between the fluid in the friction groove portion 223 and collision between the fluid and the friction protrusions accelerates the energy release of the fluid molecules, and turbulent flow during collision is induced to increase the momentum of the fluid molecules. Leading to rapid heating of the fluid.

In addition, the fluid is accelerated / depressurized while the fluid flows through the centrifugal discharge hole 236 formed in the first friction protrusion 221 and the flow through hole 235, and is decelerated / The bubbles are formed by the acceleration / decompression and the deceleration / pressure increase of the fluid, and the inner wave is repeated, thereby further heating the fluid.

The fluid that rotates inside the heating space HS due to the rotation of the friction head 200 repeatedly collides with the friction rib 112 formed on the inner peripheral surface of the case 100, Energy emissions are promoted and turbulent flow is induced to promote fluid heating.

The fluid heated through the above-described process is discharged to the outside through an outlet 111 formed in a side portion of the case 100.

In the case of the fluid pump electric boiler according to the present invention, the third induction groove 124 formed on the front cover member 120 installed on the front surface of the housing 110, and the second induction groove 124 formed on the rear surface of the housing 110, The first guide groove 134 and the second guide groove 135 formed in the member 130 and the flow guide groove 2112 formed in the shaft coupling portion 211 of the body portion 210 constituting the friction head 200 Can facilitate the flow of the fluid relatively far from the outlet 111 so that the fluid can be circulated and discharged smoothly without remaining at the corresponding position.

The filler 132 formed on the back cover member 130 protrudes to the inside of the heating space HS to fill a space unnecessary for heating the fluid. Thus, the heating space HS having a volume optimized for heating the fluid, It is possible to prevent the fluid pressure loss due to the fluid stagnation around the shaft coupling part 211. [

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

Description of the Related Art
10: Base frame 20: Burner
30: motor 40: connection shaft
50: flange coupling 100: case
110: housing 111: outlet
120: front cover member 121:
122: fixing part 123: inlet
124: third guide groove 130: rear cover member
132: filler 133: shaft hole
134: first guide groove 135: second guide groove
140: Bearing block 150: Spacer
200: Friction head 210:
211: shaft coupling portion 2112: flow guide groove
220: friction protrusion 221: first friction protrusion
222: second friction projection 223: friction sliding portion
224: ring-shaped groove portion 230: discharge hole
235: Flow through hole 236: Centrifuge discharge hole
240: end shaft 241:
243: first blade 250: impeller
251: the second blade

Claims (7)

A base frame;
A burner mounted on the base frame for heating a fluid flowing through the inlet while the friction head rotates in a heating space inside the case having an inlet and an outlet for the fluid; And
And a motor mounted on the base frame so as to be positioned adjacent to the burner and axially coupled to the friction head to rotate the friction head,
The friction head includes:
A body part formed in parallel with the inflow port and formed with an inflow space through which an inflow fluid flows into an interior of the case through an inflow port, and a shaft coupling part coupled to a connection shaft extending from the motor;
A plurality of frictional grooves formed along the circumferential direction of the body and spaced apart from each other along a longitudinal direction of the body, the frictional grooves being divided by a plurality of frictional grooves along the circumferential direction of the body, And a plurality of second friction protrusions spaced apart from the first friction protrusions and protruding lower than the height of the first friction protrusions, the plurality of first friction protrusions being divided by a plurality of ring- And a friction protrusion,
At least one of the friction protrusions is formed with a discharge hole communicated with the inflow space,
The front side surfaces of the first and second friction projections located in the front region and the rear region of the body portion of the first friction projections and the second friction projections are recessed more concave from the friction groove portions so that the front side edge of the first friction projections and the second friction projections And a hook structure protruding in the direction of the hook,
In this case,
A housing having a cylindrical structure with front and rear openings, the outlet being formed on a side surface;
The inlet port for the installation of the end shaft and the inflow of the fluid is formed in the center, and a rear surface facing the heating space is connected to the front surface of the housing by the rotation of the friction head A front cover member having a plurality of third flow grooves spaced apart from each other in the circumferential direction, the plurality of third flow grooves having an arc-shaped structure bent in the rotational direction of the friction head to assist flow of the fluid; And
A connection shaft extending from the motor and a shaft hole for mounting the mechanical seal are formed to penetrate the central portion so as to close the open rear surface of the housing, And a rear cover member protruding to the inside of the heating space so as to surround the shaft coupling part and including a filling part for filling a space between the shaft coupling part and the case. The method according to claim 1,
A plurality of flow guide grooves formed on a rear surface of the shaft coupling portion to allow fluid to flow around the shaft coupling portion when the friction head rotates, the plurality of flow guide grooves being formed on a rear surface of the shaft coupling portion so as to be spaced apart from each other in the circumferential direction of the shaft coupling portion Wherein the fluid pump is a boiler. delete The method according to claim 1,
A plurality of first guide grooves formed on a front surface of the filler portion and formed in a circular arc structure bent in a rotational direction of the friction head; And
And a plurality of second induction grooves formed on an inner circumferential surface of the shaft hole and formed in a helical structure extending along the rotational direction of the friction head. The method according to claim 1,
A plurality of first fluid passages coupled to the front of the friction head for rotation with the friction head, the fluid passages being formed therein for fluid flowing into the inflow space through the fluid inlet and forming a first vortex during rotation of the friction head, An end shaft integrally formed with a rear surface of the blade; And
And an impeller installed at an end of the connecting shaft to rotate inside the inflow space and having a plurality of second blades protruding integrally from the front to form a second vortex of the flow opposing the first vortex Wherein the fluid pump is an electric boiler. The method according to claim 1,
And a bearing block provided at a rear end of the case to support rotation of the connection shaft,
Wherein a plurality of spacers are provided between the bearing block and the case so that the case and the bearing block are separated from each other. The method of claim 6,
Wherein each of the spacers is formed in a cylindrical shape with a hole through which a bolt fastened to fix the bearing block to the case is formed at a central portion thereof.
KR1020160013846A 2016-02-04 2016-02-04 Electric boiler using fluid frictional heat KR101680118B1 (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101036662B1 (en) * 2010-12-06 2011-05-25 송동주 Fluid heater

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101036662B1 (en) * 2010-12-06 2011-05-25 송동주 Fluid heater

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