KR20160003424U - The circulation device of warm water boiler - Google Patents

The circulation device of warm water boiler Download PDF

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Publication number
KR20160003424U
KR20160003424U KR2020150001922U KR20150001922U KR20160003424U KR 20160003424 U KR20160003424 U KR 20160003424U KR 2020150001922 U KR2020150001922 U KR 2020150001922U KR 20150001922 U KR20150001922 U KR 20150001922U KR 20160003424 U KR20160003424 U KR 20160003424U
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KR
South Korea
Prior art keywords
air
check valve
hot water
valve bodies
water
Prior art date
Application number
KR2020150001922U
Other languages
Korean (ko)
Inventor
김윤식
강청원
Original Assignee
김윤식
강청원
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 김윤식, 강청원 filed Critical 김윤식
Priority to KR2020150001922U priority Critical patent/KR20160003424U/en
Publication of KR20160003424U publication Critical patent/KR20160003424U/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
    • F24D3/1058—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system disposition of pipes and pipe connections
    • F24D3/1066—Distributors for heating liquids
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C21/00—Attachments for beds, e.g. sheet holders, bed-cover holders; Ventilating, cooling or heating means in connection with bedsteads or mattresses
    • A47C21/04—Devices for ventilating, cooling or heating
    • A47C21/048—Devices for ventilating, cooling or heating for heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/12—Tube and panel arrangements for ceiling, wall, or underfloor heating
    • F24D3/122—Details

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Steam Or Hot-Water Central Heating Systems (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)

Abstract

More specifically, first and second check valve bodies are attached to the inner circumferential surface of the water storage tank so that the two-person hot water mat can be individually heated, and the first and second check valve bodies are provided on the outer circumferential surface of the water storage tank. When a hot water boiler circulation apparatus having a heater unit for heating water supplied through a check valve body is operated for the first time, a forced air discharge unit for discharging air to easily supply the water storage tank into the first and second check valve bodies is formed The first and second check valve bodies and the distributor are connected to each other so that when excessive pressure is generated in the first and second check valve bodies when the hot water boiler circulation device operates, the distributor is connected to the air automatic switch And the buffer cap is installed in the first and second check valve bodies when the shutoff valve is operated, The contacted portion is formed as a light-weight thin film to prevent noise from being generated by buffering shock during contact.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water boiler circulating device for a hot water mat,

More specifically, first and second check valve bodies are attached to the inner circumferential surface of the water storage tank so that the two-person hot water mat can be individually heated, and the first and second check valve bodies are provided on the outer circumferential surface of the water storage tank. When a hot water boiler circulation apparatus having a heater unit for heating water supplied through a check valve body is operated for the first time, a forced air discharge unit for discharging air to easily supply the water storage tank into the first and second check valve bodies is formed The first and second check valve bodies and the distributor are connected to each other so that when excessive pressure is generated in the first and second check valve bodies when the hot water boiler circulation device operates, the distributor is connected to the air automatic switch And the buffer cap is installed in the first and second check valve bodies when the shutoff valve is operated, Water circulating device for circulating hot water in a hot water mat for preventing a noise from occurring due to a buffering action upon contact.

Generally, a hot water mat means that water stored in a water tank is heated by an electric heater of a hot water boiler circulation device, and hot water generated is supplied to a supply hose installed in a hot water mat and circulated.

Accordingly, there is an advantage that the hot water mat can solve the problems of existing electric mats in which the electric heating element is built up, that is, the risk of fire or electric shock due to harmful electromagnetic waves and electric hot wire.

Meanwhile, in the conventional hot water boiler circulating apparatus for a hot water mat, a forced circulation type hot water boiler using an electric motor pump or the like and a natural circulation type (non-powered type) circulating hot water by the expansion pressure in accordance with a method of circulating hot water heated by an electric heating element ) Hot water boiler circulation device, and recently, natural circulation hot water boiler circulation device is mainly used.

The natural circulation hot water boiler circulation apparatus includes a check valve body, a heater unit, and a power supply unit (PCB).

The water storage tank stores hot water circulated to the inside of the hot water mat and hot water to be recovered. The check valve body supplies water to the heater unit and prevents the water from flowing back in the course of heating the supplied water.

In addition, the heater unit heats the water and vaporizes some water to create the expansion pressure which is the driving force of the hot water circulation, and the power supply unit (PCB) controls the electric parts including the heater power supply, temperature, water level and pressure.

The natural circulation hot water boiler circulation device prevents the hot water heated by the blocking plate located inside the check valve body from flowing back to the water tank by the expansion pressure generated in the process of heating the water by the electric heater, The hot water is discharged to the hot water mat, and the hot water passing through the hot water mat is circulated in a manner that the temperature is lowered to the low temperature water and discharged to the water tank, and then supplied to the electric heater through the check valve body in the water tank.

Therefore, in recent years, the natural circulation (hot-water) boiler circulation device does not require an electric motor pump to supply hot water and supplies it. Therefore, it produces less noise, generates little noise, It is advertised and manufactured by the manufacturer to the consumer, and it is on the market.

However, a commercially available natural circulation hot water boiler circulation device has a problem that a larger noise is generated during operation than a forced circulation hot water boiler circulation device.

The reason why the noise is generated in the natural circulation boiler as described above is that the hot water is discharged by the expansion pressure generated in the process of heating the water supplied from the water reservoir to the heater and then the water is supplied to the check valve body When the installed blocking plate opens and closes the hot water supply hole, the hot water supply hole descends at a high speed due to the pressure and collides with the partition wall formed with the hot water supply hole so as to be closed.

In addition, when the water supplied from the water tank is heated by the electric heater, air accumulates inside the check valve body. If the water can not be discharged periodically, the expansion pressure is excessively increased above a predetermined value, The water is rapidly introduced into the check valve body due to the noise generated by the noise and the reflexive suction force, thereby causing the water hammer phenomenon.

In addition, when the hot water boiler circulation device is operated for the first time, since the hot water is heated in the check valve body and then stopped, the expansion pressure is filled up, so that the shutoff plate does not operate normally due to the expansion pressure, There is a problem that it can not be supplied.

In addition, a check valve body and a solenoid valve are connected in order to discharge the accumulated air inside the check valve body. When the hot water mat is used for two persons, each solenoid valve is connected to the first and second check valve bodies There is a problem that the manufacturing cost is increased.

In order to supply and block the water stored in the water storage tank to the inside of the check valve body, a water inflow hole formed in the check valve body is opened and closed by operating the blocking plate in the forward and backward directions, and the blocking plate is separated from the water inflow hole, There is a problem that noise is generated.

As described above, the blocking plate is detached from the water inflow hole. In the process of contacting, the impact is not absorbed and the impact is struck. Therefore, the noise is continuously generated.

Korea Patent Registration No. 10-0876939 "Hot Water Circulation Device" Korea Patent Registration No. 10-714511 "Hot water supply unit using heater"

In order to solve the above-mentioned problems, the present invention provides a circulation device for a hot water boiler, which is capable of forcibly discharging inflation pressure filled in first and second check valve bodies when water is injected in a stopped state, 1 and 2, when the water is supplied to the water inlet hole of the check valve body, the blocking plate is separated from the water inlet hole. The impact generated during the contact is absorbed to prevent noise, It is intended that the pressure can be discharged to one air automatic switch.

According to an aspect of the present invention, there is provided an apparatus for storing water, comprising: a water storage tank for storing water; first and second check valve bodies for introducing and blocking water stored in the water storage tank; The hot water heated by the heater unit is supplied to the hot water supply hose embedded in the hot water mat by the expansion pressure to recover the circulated hot water into the water tank and reheated,

A first and a second check valve body having a buffer cap around the inflow hole so as to absorb and cushion the impact sound generated in the inflow and outflow of water stored in the water storage tank by the shutoff plate; A check valve body, a first check valve body, a second check valve body, a first check valve body, a second check valve body, And an air automatic switch for supplying air to the air automatic switch and supplying air from the distributor to the water storage tank at a predetermined amount or periodically, And a hot water boiler circulating device for a hot water mat.

As described above, the hot water boiler circulating apparatus for a hot water mat according to the present invention includes the first and second check valve bodies formed integrally with the forced air discharging unit, so that when the hot water boiler circulating apparatus is operated, 1, 2 It is effective to supply water smoothly into the check valve body 1 and 2 by forcibly discharging the air filled in the check valve body.

In addition, the present invention has the effect of preventing the noise by absorbing and buffering the impact sound generated when the closing cap of the first and second check valve bodies is fitted and fitted with a buffer cap of silicon material.

In addition, since the present invention has a distributor for discharging the accumulated air in the first and second check valve bodies and then discharges the air by connecting it to the air automatic switch, there is no need to install two air automatic switches as in the prior art, The installation space can be minimized, and the amount of electricity used can be reduced.

Fig. 1 is a perspective view showing the circulation device of the present invention.
FIG. 2 is a sectional view showing the circulation device of the present invention.
3 is a plan view showing the circulation device of the present invention.
FIG. 4 is a perspective view showing a distributor in the present hot water boiler circulation apparatus. FIG.
FIG. 5 is an exploded perspective view showing a distributor in the present hot water boiler circulation apparatus. FIG.
6 is a plan view showing a distributor in the present hot water boiler circulation apparatus.
7 is a sectional view showing the operation state of the distributor in the present hot water boiler circulation apparatus.
8 is an exploded perspective view showing the first check valve body in the present hot water boiler circulation apparatus.
9 is a sectional view showing a buffer cap in the present hot water boiler circulation apparatus.
10 is a sectional view showing the operating state of the first check valve body in the present hot water boiler circulation apparatus.

In order to achieve the above objects and effects, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view showing the present hot water boiler circulation apparatus, FIG. 2 is a sectional view showing the present hot water boiler circulation apparatus, and FIG. 3 is a plan view showing the present hot water boiler circulation apparatus.

The hot water boiler circulation apparatus (1) comprises a water storage tank (12) for storing water, first and second check valve bodies (5, 6) for supplying water stored in the water storage tank (12) to a heater section, And a heater unit 9 and 9 'connected to the two check valve bodies 5 and 6 to heat the inflow water and hot water heated by the heater units 9 and 9' And the circulating hot water supplied to the hot water supply hose embedded therein is recovered to the water storage tank 12, reheated, and then supplied.

The water storage tank (12) supplies water collected or stored in the hot water mat to the first and second check valve bodies (5, 6).

The first and second check valve bodies 5 and 6 are connected to the inner circumferential surface of the water storage tank 12 and the heater units 9 and 9 ' Is supplied from the first and second check valve bodies 5 and 6 to the heater portions 9 and 9 'through the first and second check valve bodies 5 and 6 while heating water supplied to the heater portions 9 and 9' The backflow of water to the water storage tank 12 is blocked by the blocking plate and the heated water is supplied to the hot water hose provided in the hot water mat by the expansion pressure generated in the process of heating the water.

The first and second check valve bodies 5 and 6 for supplying hot water to the hot water mat for two persons are formed in the same structure.

The first and second check valve bodies 5 and 6 are provided on one side of the check valve body 5 so as to protrude into the one or two check valve bodies 5 and 6 so as to allow water stored in the water storage tank 12 to be blocked A water inflow hole 17 is formed in the inside of the tightening pipe 16 and water stored in the water storage tank 12 is inserted into the water inflow hole 17 in a state in which the buffer cap 18 is fitted. The first and second check valve bodies 5 and 6, respectively.

The buffer gap 18 is formed of a silicone material and has a cylindrical shape in which the portion where the clamping pipe 16 is inserted is opened and the other side to which the blocking plate 20 is closely attached is formed with a step portion 33, The step 33 has a light shielding film 19 formed in the peripheral direction around the through hole to absorb and absorb the impact generated when the shielding plate 20 opens and closes the water inflow hole 17. [

A fixing projection 15 protrudes from the top of the clamping tube 16 in the first and second check valve bodies 5 and 6 and is fitted to the fixing protrusion 15 And the water inlet hole is opened and closed by rotating the front and back surfaces so as to closely contact and separate.

A forced air discharge portion 2 is formed above the first and second check valve bodies 5 and 6 and the forced air discharge portion 2 is formed with an air discharge chamber 14, An air discharge hole 32 is formed in the upper and lower sides of the chamber 14 so as to be respectively communicated with the inside of the first and second check valve bodies 5 and 6. A spring 13 is inserted into the air discharge chamber 14 And the air discharge hole 32 is opened by the tension force when the discharge up / down button 3 is inserted into the air discharge hole 32 and the discharge up / down button 3 is engaged with the spring 13, And when the pressure is released, the air discharge hole 32 is closed.

Therefore, when the hot water boiler circulation apparatus 1 is operated for the first time, since the first and second check valve bodies 5 and 6 are in a vacuum state, the shutoff plate 20 is not opened by the pressure, The user can manually push the discharge up / down button 3 to forcibly discharge the air filled in the first and second check valve bodies 5, 6.

The first and second check valve bodies 5 and 6 are provided in the process of heating the water supplied from the water reservoir 12 to the first and second check valve bodies 5 and 6 by the heater portions 9 and 9 ' The air automatic switch 8 is operated to discharge the pressure to the water storage tank 12 at predetermined time intervals in a state where the distributor 7 and the air automatic switch 8 are connected in order to discharge the pressure.

If the air automatic shutters 8 are provided on the first and second check valve bodies 5 and 6 respectively, the manufacturing cost is increased and the volume of the hot water boiler circulation apparatus 1 can be increased. 1 and 2 check valve bodies 5 and 6 to the air automatic switch 8 and discharges the water to the water storage tank 12.

That is, the air automatic shut-off device 8 controls the air accumulated in the first and second check valve bodies 5 and 6 in a state of being connected to the distributor 7 at regular intervals 3 seconds) to the water storage tank 12.

On the other hand, it is preferable that the air automatic switch 8 uses an open / close method using a solenoid valve or an electromagnet, or an open / close method using a stepping motor or the like.

FIG. 4 is a perspective view showing a distributor in the present hot water boiler circulation apparatus, FIG. 5 is an exploded perspective view showing a distributor in the present hot water boiler circulation apparatus, and FIG. 6 is a perspective view showing a distributor in the present hot water boiler circulation apparatus. Fig.

The air distributing chamber (7) comprises a body and a lid, and an air confluence chamber (31) is formed in the body from an upper side to an inward side. In the center of the air confluence chamber (31), a fastening protrusion (30) First and second air inlets 11 and 11 'are connected to the first and second air outlets 11 and 11' of the first and second check valve bodies 5 and 6 so that air is introduced into the first and second check valve bodies 5 and 6, The air confluence chamber 31 is formed at the central front surface with a confluence discharge pipe 26 for discharging the air introduced into the first and second air inlets 11 and 11 'to the air automatic switch 8.

The air opening and closing wings 23 formed in the same shape as the air joining chamber 31 of the body are formed in a film shape and first and second wings 24 and 25 are integrally formed on the left and right sides to form an air joining chamber The first and second blades 24 and 25 are inserted into the first and second air inlets 28 and 28 in a state where the central portion between the first and second blades 24 and 25 is fitted to the fastening protrusion 30, 29 and 29. When the air is introduced into the first and second air inlets 28 and 29, the corresponding vanes are raised so that air is introduced into the first and second air inlets 28 and 29. When the air stops flowing, 31 discharge the air through the combined discharge pipe 26. [

7 is a cross-sectional view showing the operating state of the distributor in the present hot water boiler circulation apparatus.

The distributor 7 is connected to the first and second air outlets 11 and 11 of the first and second check valve bodies 5 and 6 to discharge the air filled in the first and second check valve bodies 5 and 6, Closing wing 23 is inserted into the air confluence chamber 31 formed in the distributor 7 in a state where the first and second air inlets 28 and 29 are connected by the air outlet hose 10, The first and second vanes 24 and 25 located on the left and right sides of the air opening and closing vane 23 are vertically pivoted so that the first and second air inlets 28 and 29, Respectively.

The first and second vanes 24 and 25 move at the same time when the air is simultaneously introduced into the first and second air inlets 28 and 29 and are moved from the first air inlets 28 or the second air inlets 29, Thereby opening and closing the first and second air inlets 28 and 29, respectively.

The air introduced through the first and second air inflow ports 28 and 29 moves along the air confluence chamber 31 and is discharged through a confluence discharge pipe 26 formed at the front center of the air confluence chamber 31 After the air is introduced into the air automatic shut-off device 8 by the air discharge hose 10, the air automatic shut-off device 8 discharges the air introduced into the water storage tank 12.

8 is a perspective view showing the first check valve body in the present hot water boiler circulation apparatus, FIG. 9 is a sectional view showing a buffer cap in the present hot water boiler circulation apparatus, and FIG. 10 is a cross- Sectional view showing the operating state of the first check valve body in the apparatus.

The first and second check valve bodies 5 and 6 are provided in the same structure as the first and second check valve bodies 5 and 6. The first and second check valve bodies 5 and 6 are provided in the hot water boiler circulation device 1, The shutoff plate 20 is pressed by the inflation pressure filled in the first and second check valve bodies 5 and 6 to keep the water inflow hole 17 closed so that the water in the water storage tank 12 Water can not be smoothly supplied and the discharge elevation button 3 of the air forced discharge unit 2 integrally formed on the upper portions of the first and second check valve bodies 5 and 6 is pushed down When the air is exhausted through the air discharge hole 32 and the pressure of the discharge up / down button 3 is released, the discharge up / down button 3 is positioned by the tension force of the spring 13, Close and seal.

When the blocking plate 20 for supplying and blocking water through the water inflow hole 17 of the first and second check valve bodies 5 and 6 is opened and closed in the water storage tank 12, So that noise is not generated in the course of collision of the plate 20, and the impact is absorbed and buffered.

The damping cap 18 forms a step portion 33 at a contact portion against the blocking plate 20. The center of the step portion 33 is formed in the center of the step portion 33 in a state of passing through water, The light transmissive film 19 is formed so as to gradually increase in thickness toward the edge direction.

Therefore, the shock absorbing cap 18 absorbs the shock due to the tension force applied to the shock absorbing cap 18 when the shock absorbing cap 18 is in direct contact with the shielding plate 20, and when the shielding plate 20 is closed, Thereby preventing leakage of the water.

1: hot water boiler circulation device 2: forced air outlet
3: Emission lift button 4: Air discharge hole
5: first check valve body 6: second check valve body
7: joiner 8: air automatic switch
9, 9 ': heater part 10: air discharge hose
11: Air outlet 12: Reservoir
13: spring 14: air discharge chamber
15: fixing projection 16: fastening tube
17: Water inflow hole 18: Buffer cap
19: light desert 20: shield plate
21: opening 22: water supply pipe
23: air opening / closing wing 24: first wing
25: second blade 26: merging discharge pipe
28: First air inlet
29: second air inlet 30: fastening projection
31: air confluence chamber 32: air vent
33:

Claims (4)

A first and second check valve bodies (5, 6) for introducing and blocking water stored in the water storage tank (12), first and second check valve bodies (5, 6 The hot water heated by the heater units 9 and 9 'is supplied to the hot water supply hose embedded in the hot water mat by the inflation pressure, In the hot water boiler circulation apparatus (1) in which the hot water is recovered by the water storage tank (12) and reheated and supplied,
A tightening pipe 16 protrudes from one side of the water storage tank 12 so as to form a water inflow hole 17 therein so that the water stored in the water storage tank 12 can be flowed into and blocked from the water storage tank 12. In the tightening pipe 16, A fixing protrusion 15 protrudes from the top of the tightening pipe 18 and an upper portion of the blocking plate 20 is fitted to the fixing protrusion 15 so that the front surface and the back surface are in close contact with each other, First and second check valve bodies (5, 6) rotating to separate and open the buffer cap (18); Wow
An air discharge chamber 14 is formed above the first and second check valve bodies 5 and 6 and the first and second check valve bodies 5 and 6 are provided in the upper and lower portions of the air discharge chamber 14, A spring 13 is inserted into the air discharge chamber 14 and a discharge up / down button 3 is inserted into the air discharge hole 32, (2) for closing the air discharge hole (32) by a tensile force when the discharge air lift button (3) is pressed in the state where the air discharge hole (3) ;
The first and second air outlet ports 11 and 11 'of the first and second check valve bodies 5 and 6 are connected to the air outlet hose 10 so as to introduce air into the air outlet hose 10, A distributor (7) for supplying the electric power to the electric motor; Wow
Wherein the air supplied from the distributor (7) is composed of an air automatic switch (8) for discharging air to the water storage tank (12) Circulation device.
The air conditioner according to claim 1, wherein the forced air discharge portion (2) pressurizes the discharge elevation button (3) when water is injected into the water storage tank (12) to discharge air from the first and second check valve bodies And the hot water boiler circulation device for hot water mat.
The shock absorber according to claim 1, wherein the cushioning cap (18) is made of a silicone material and is open at a portion where the fastening tube (16) is fitted, and the other end of the cushioning cap (18) , And the step portion (33) is formed with a light shielding film (19) in the peripheral direction around the through hole.
The air conditioner according to claim 1, wherein the distributor (7) comprises a body and a lid, an air confluence chamber (31) is formed in the body from the top to the inside, The first and second air inlet ports 28 and 29 are connected to the first and second air outlet ports 11 and 11 'of the first and second check valve chambers 5 and 6, A body formed with a merging discharge pipe 26 for discharging the air introduced into the first and second air inlets 28 and 29 to the air automatic switch 8 on the central front surface of the air merging chamber 31; Wow
The first and second blades 24 and 25 are integrally formed on both sides of the body so as to have the same shape as the air confluence chamber 31. When the first and second blades 24 and 25 are inserted into the air confluence chamber 31, The first and second blades 24 and 25 seal the first and second air inlets 28 and 29 while the central portion between the first and second blades 24 and 25 is fitted to the first and second blades 24 and 25, When the air is introduced into the first and second air inlets 28 and 29, the corresponding blades rise and the air flows in. When the air stops flowing, the air returns to the original state. 26. The hot water boiler circulating device for hot water mat as claimed in claim 1,



KR2020150001922U 2015-03-26 2015-03-26 The circulation device of warm water boiler KR20160003424U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR2020150001922U KR20160003424U (en) 2015-03-26 2015-03-26 The circulation device of warm water boiler

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Application Number Priority Date Filing Date Title
KR2020150001922U KR20160003424U (en) 2015-03-26 2015-03-26 The circulation device of warm water boiler

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KR20160003424U true KR20160003424U (en) 2016-10-06

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KR2020150001922U KR20160003424U (en) 2015-03-26 2015-03-26 The circulation device of warm water boiler

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100714511B1 (en) 2005-07-01 2007-05-07 오현오 The Device to supply Warm-water using Electric Heater
KR100876939B1 (en) 2008-09-10 2009-01-07 김용후 Hot water circulation apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100714511B1 (en) 2005-07-01 2007-05-07 오현오 The Device to supply Warm-water using Electric Heater
KR100876939B1 (en) 2008-09-10 2009-01-07 김용후 Hot water circulation apparatus

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