JPH0618813U - Electric water heater - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the size of the entire heater and heat the radiation fins in an extremely short time to accelerate the initial rise of heat radiation. [Structure] A large number of heat radiation fins 7 are circumferentially fixed on the outer peripheral surface of a linear heating copper tube 6, and a sheath heater 8 is installed in the center of the inside of the heating chamber 5 over substantially the entire length of the heating copper tube 6. At the same time, an aqueous solution 9 composed of water, ethylene glycol and borax is injected into the heating chamber 5, and the expansion chamber 10 is further expanded.
Inert gas is injected into the horizontal pipe section 12 and the bent pipe section 1
The lower end portion of the bent tube portion 13 of the expansion chamber copper tube 14 having the above-mentioned No. 3 is connected and fixed to the upper surface of the other end portion of the heating copper tube 6.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electric water heater.

[0002]

[Prior art]

 Conventionally, as this kind of electric water heater, the one disclosed in Japanese Patent Publication No. 57-51020 has been known.

[0003]

[Problems to be solved by the device]

 In both of the two embodiments, the one disclosed in Japanese Patent Publication No. 57-51020 is formed in a substantially rectangular ring shape by connecting parallel high-order pipe parts and low-order pipe parts at a predetermined interval. Inside the circulating copper pipe, heat the water in the circulating copper pipe and the aqueous solution of ethylene glycol, charcoal fire inhibitor, etc. by energizing the sheathed heater installed in the lower pipe part of the circulating copper pipe. The heat radiation fins attached and fixed to the outer periphery of the high-order pipe portion are heated to radiate heat from the heat radiation fins. However, since the volume of the circulating copper pipe is large, the amount of aqueous solution is large, and since the radiation fins are attached and fixed to the outer periphery of the higher pipe, the sheathed heater installed in the lower pipe heats up. After that, the aqueous solution is heated, and the radiating fins are heated only after the heated aqueous solution is circulated in the high-level pipe section, so the radiating fins must be heated until some time has passed after the energization of the sheathed heater. However, there was a problem that it was not heated and the initial rise when starting heat dissipation was slow.

Further, the one disclosed in Japanese Patent Publication No. 57-51020 is formed in a substantially rectangular ring shape by connecting parallel high-order pipe parts and low-order pipe parts at a predetermined interval. In addition, since it was necessary to use a copper pipe for circulation, it was not possible to downsize the heater as a whole.Moreover, since a high-rank pipe part and a low-rank pipe part were required, a large amount of pipe material had to be used. As a result, the cost is increased and the number of welding points is increased, so that there is a problem that a liquid leakage accident easily occurs.

The present invention is intended to provide an electric water heater, which aims to solve the above conventional problems.

[0006]

[Means for Solving the Problems]

 According to the present invention, both sides of a linear heating copper tube having heating chambers whose both ends are closed are held and fixed to holding plates provided on both sides of the bottom plate of the casing, and the heating copper tube is A large number of heat radiation fins are circumferentially fixed on the outer peripheral surface, and a sheathed heater is installed at the center of the inside of the heating chamber over substantially the entire length of the heating copper tube, and water, ethylene glycol and borax are provided in the heating chamber. While pouring an aqueous solution prepared by mixing each of the above, the expansion chamber is provided inside, and the other side of the horizontal pipe with a pressure relief valve attached to one end is bent into a hook to provide a bent pipe. A copper tube for an expansion chamber is formed, and a lower end portion of a bent tube portion of the copper tube for an expansion chamber is communicated and fixed to an upper surface of the other side end portion of the heating copper tube, and an inert gas is injected into the expansion chamber. By adopting the means, It was persists.

[0007]

[Action]

 According to the present invention configured as described above, the sheathed heater is installed in the heating chamber over substantially the entire length of the heating copper tube, and a large number of heat radiating fins are provided on the outer periphery of the linear heating copper tube into which the aqueous solution is injected. Since it is fixed and the amount of the aqueous solution is small, the sheath heater is energized to heat the solution, and when the aqueous solution is heated by this, the heat is immediately transferred to the radiation fins via the copper tube for heating, and the heat can be transferred for a short time. The radiating fins are heated by.

[0008]

【Example】

 An embodiment of the present invention will be described in detail with reference to the drawings. Holding plates 3 and 4 installed on both sides of a bottom plate 2 of a casing 1 have a predetermined height above the bottom plate 2 and both ends thereof. Both sides of a linear heating copper tube 6 having a closed heating chamber 5 are held and fixed, and a large number of heat radiation fins 7 are circumferentially fixed to the outer peripheral surface of the heating copper tube 6. A sheathed heater 8 is installed in the center of the heating chamber 5 over substantially the entire length, and in the heating chamber 5, about 60% of water, about 35% of ethylene glycol as a water additive, and a charcoal fire are added. An aqueous solution 9 made by mixing about 5% of borax as an inhibitor is injected. Since the heating copper pipe 6 is linear, the amount of the aqueous solution 9 injected is smaller than that of the conventional rectangular copper pipe for circulation.

Further, the expansion chamber 10 is provided for the expansion chamber 10 by providing the expansion chamber 10 therein and the other end of the horizontal pipe portion 12 having the pressure relief valve 11 attached to one end thereof is bent into a hook shape. A copper tube 14 is formed, and the lower end of the bent tube portion 13 of the expansion chamber copper tube 14 is connected and fixed to the upper surface of the other end of the heating tube 6 so that the lower surface of the horizontal tube portion 12 dissipates the heat. It is formed so as not to contact the fins 7, and about 2 pounds of inert gas is injected into the expansion chamber 10 of the expansion chamber copper tube 14.

At one end of the heating copper tube 6 located in a box 15 provided at one end of the casing 1, an overheat protector 16 having a high limit switch installed therein is provided with the sheath heater 8 A thermostat 18 is arranged between the sheathed heater 8 and the power source plug 17 in parallel.

The injection ratio of water, ethylene glycol and borax injected into the heating chamber 5 and the injection amount of the inert gas injected into the expansion chamber 10 are determined by the volume of the heating chamber 5 and the expansion chamber 10. However, the mixing ratio and weight are not limited to those described above. Although not particularly limited, it is recommended that the void volume of the expansion chamber 10 is preferably about 10% of the total volume of the heating chamber 5.

Next, the operation of the embodiment of the present invention will be described. When the power plug 18 is inserted into the outlet, the sheath heater 8 is energized via the thermostat 19 and the sheath heater 8 starts to generate heat. Since the amount of the aqueous solution 9 in the heating chamber 5 is small due to the heat generated by the sheathed heater 8, the aqueous solution 9 is heated in a short time, and heat is taken from the entire surface of the sheathed heater 8, and the further heated aqueous solution 9 is removed from the sheathed heater 8. It flows toward the inner peripheral wall surface of the heating copper tube 6, whereby the entire heating copper tube 6 is heated, and the heat is conducted to the radiating fins 7 provided around the outer periphery of the heating copper tube 6, The heat is radiated from the radiation fins 7 to the outside. At that time, the aqueous solution 9 radiates as much heat as necessary due to the fin effect to the radiating fins 7, whereby the aqueous solution 9 in which the temperature near the inner peripheral wall surface of the heating copper pipe 6 is lowered is directly seeded again. The aqueous solution 9 is heated by the heater 8 and is thus heated by the sheathed heater 8 in the heating chamber 5 to constantly release heat of a suitable temperature. Since the radiating fin 7 has a sheathed heater 8 installed in the heating chamber 5 and is fixed to the outer periphery of the heating copper tube 6 into which the aqueous solution is injected, when the aqueous solution 9 is heated, the heat radiating fin 7 passes through the heating copper tube 6. Immediately after that, the heat is conducted to the radiating fins 7 and the radiating fins are heated in a short time to radiate the heat.

Even if the heater of the present invention is covered with a curtain or a blanket, the uniform flow of the aqueous solution 9 does not heat only that portion, and a knob knob (not shown) attached to the casing 1 is provided. ) Is maximized and the temperature of the aqueous solution 9 becomes abnormally high, the overheat preventive device 17 operates to stop energization and prevent overheating.

When the temperature of the aqueous solution 9 rises, the pressure in the heating chamber 5 increases due to the expansion of the aqueous solution 9, but the inert gas in the expansion chamber 10 absorbs the pressure in the heating chamber 5. The pressure in the heating chamber 5 is made small to ensure safety.

[0015]

[Effect of device]

 Since the present invention is as described above, the radiating fin has the sheathed heater installed in the heating chamber and is fixed to the outer periphery of the linear heating copper tube into which the aqueous solution is injected, and the injection amount of the aqueous solution is small. Therefore, when the aqueous solution is heated, the heat is immediately conducted to the radiation fins via the heating copper pipes, and this heats up and can radiate heat in a short time. The excellent effect that the initial start-up is extremely fast can be achieved. Further, according to the present invention, since the sheathed heater is installed in the heating chamber and the heat radiation fins are fixed to the outer periphery of the heating copper tube into which the aqueous solution is injected, the high-level heater like the conventional electric water heater is installed. The rectangular annular copper pipe for circulation with the lower pipe part and the lower pipe part is not required, and the entire heater can be downsized, and the amount of pipe material used is small, and the cost can be reduced accordingly. Since there are few pipe welding points, it is possible to prevent liquid leakage accidents.

[Brief description of drawings]

FIG. 1 is a front view showing the electric water heater with a front cover removed and a part cut away.

[Explanation of symbols]

1 casing, 2 bottom plate, 3, 4 holding plate, 5 heating chamber, 6 heating copper tube, 7 radiating fins, 8 sheath heater, 9 aqueous solution, 10 expansion chamber, 11 pressure relief valve, 12 horizontal pipe part, 13
Bent pipe part, copper tube for 14 expansion chambers.

Claims (1)

[Scope of utility model registration request] 1. A straight heating copper tube having heating chambers whose both ends are closed is fixed to both sides of holding plates provided on both sides of the bottom plate of the casing, and the heating copper tube is A large number of heat radiation fins are fixed around the outer peripheral surface,
Furthermore, a sheathed heater is installed in the center of the inside of the heating chamber over substantially the entire length of the heating copper tube, and water is placed in the heating chamber.
While injecting an aqueous solution prepared by mixing ethylene glycol and borax, the expansion chamber is provided inside and the other end of the horizontal pipe with a pressure relief valve attached to one end is bent into a hook shape and bent. To form a copper tube for the expansion chamber, and the lower end of the bent tube portion of the copper tube for the expansion chamber is connected and fixed to the upper surface of the other side end of the copper tube for heating, and inert gas is introduced into the expansion chamber. An electric hot water heater made by injection.