CN1358971A - Electric shock-proof electric water heater - Google Patents

Abstract

The invention provides an electric shock prevention type electric water heater, which comprises a shell, an inner container, a water inlet and outlet pipe, a water outlet liner pipe and a water inlet liner pipe. The invention embeds the water inlet liner tube in the inner chamber, and adopts the structural form of inverted U-shaped, M-shaped or water inlet straight tube and sleeve cover, which increases the zigzag length of the water flow path, and makes the length L from the water inlet to the water outlet of the water inlet liner tube reach L>53r²The requirement of safe length.

Description

Anti-electric shock type electric water heater

Technical field

The present invention relates to a kind of electric heater, specifically to the improvement of existing electric heater structure.

Background technology

The most frequently used anticreep mode of existing electric heater mainly contains two kinds, and a kind of is to adopt leakage switch, when leakage current surpasses setting, can cut off the electricity supply automatically, guarantees that electric heater is safe and reliable.Another is that the electric leakage automatic detection device is installed on electric heater, when leakage current surpasses set quota, promptly reports to the police automatically, reminds the user to turn off power supply, to guarantee end user's life security.But above these the two kinds modes of protecting all make the user stronger to the earth leakage protective device dependence, just in case leakage switch or automatically the detection alarm device damage or leak electricity when malfunctioning, will take place, even threaten user's life security.Therefore, what the user was concerned about the most to electric heater is exactly safety problem, and this also is the problem that manufacturer payes attention to the most.In order to guarantee the safety in utilization of electric heater, manufacturer has carried out number of research projects on the Insulation Problems of electricity and water, and has done many improvement, but increased the cost of electric heater greatly, and electric shock accidents takes place in case damage still can be leaked electricity in insulant.In order to overcome the defective of above-mentioned anti-electric shock apparatus, the applicant proposes a kind of new design concept, adopts two insulation tubes to be connected on the outer inlet tube and outlet tube of shell, and the length L of above-mentioned insulation tube should satisfy L＞53r ²Requirement (r is a water-in and water-out pipe orifice radius), if insulation tube length satisfies above-mentioned requirements, just can guarantee to do anticreep isolation, thereby guarantee safety with the water resistance of running water.But this technical scheme still has its weak point: 1, because the external setting of insulation tube just can add in the time of will arriving user installation and load onto, so just might bring many uncertain factors, increase as randomness, and security is difficult for guaranteeing.2, the external setting of insulation tube and user's pipe are difficult for supportingly, and pipe joint increases.Designing a kind of technical scheme of protection against electric shock of economic security practicality as early as possible, then is urgent problem.

Summary of the invention

The present invention will solve the external technical problem of insulation tube that prior art exists.

In order to reach the purpose that solves the problems of the technologies described above, technical scheme of the present invention is: it comprises shell, inner bag, and water inlet pipe and water outlet pipe, outlet pipe and water inlet pipe is characterized in that: described water inlet bushing pipe is an insulation tube, and its body is built-in to be arranged in the internal bladder cavity.

Water inlet bushing pipe in inner bag is straight tube shape, helically coiled, U-shaped, M shape, shaped form or straight tube and thimble joint shape.

Described straight tube and thimble joint shape structure are: the sleeve pipe body portion cover dress of straight tube in inner bag of will intaking arranged, two water pipes are integral type or fix by fastening connection piece at its faying face, the water inlet straight tube has through hole near on the tube wall at top, space between two water pipes is a water stream channel, the delivery port of sleeve pipe lower end communicates with inner bag, and above-mentioned two water pipes are the insulation tube that insulating materials is made.

The water outlet bushing pipe is the insulation tube that insulating materials is made.

Water inlet straight tube and sleeve pipe adopt bolt, nut to fix in the junction, top.

On the tube wall of the water inlet bushing pipe of water inlet bushing pipe and junction, water inlet pipe and water outlet pipe lower end, a dome dish is arranged, match with external screw thread on the water inlet pipe and water outlet pipe by nut at this dome Pan Chu water inlet pipe is fixed.

The water inlet of described water inlet bushing pipe and water outlet bushing pipe to the length L of delivery port should satisfy L＞53r ²

According to concrete test and with reference to GB13955-92 (earth leakage protective device installation and operation) regulation, the electric heater leakage current is decided to be 10mA, can guarantee user's safety.When the heating inner bag electric leakage takes place or the direct short circuit of 220V power supply that uses in heated water, dielectric resistance R=220V/10mA=22 * 10 of running water ³Ω.

Because of the electricalresistivity of running water equals 1300 Ω cm, be L if get the length of insulation tube, pore radius is r in the insulation tube, and the dielectric resistance of water is R, and resistivity of water is ρ, then:

L＝R·πr ²/ρ＝22×10 ³×3.14÷1300≈53r ²

So, when the length L of insulation tube greater than 53 times of endoporus radius r square, i.e. L＞53r ², just can guarantee to do anticreep isolation with the water resistance of running water.

The purpose that the present invention will reach then is that the internal structure of dependence electric heater just can satisfy the requirement to the insulation tube safe length.To achieve these goals, design concept of the present invention is that built-in and employing U-shaped, M shape or versions such as water inlet straight tube and casing shroud dress with insulation tube are to increase the flow process of water inlet route, thereby realized on the basis that does not take space outerpace, making it reach L＞53r ²The safe length requirement.

Description of drawings

Fig. 1 is the water inlet straight tube of anti-electric shock type electric water heater of the present invention and the profile of thimble joint version;

Fig. 2 is the version profile that the water inlet bushing pipe of anti-electric shock type electric water heater of the present invention curves square frame shape;

Fig. 3 is the version profile that the water inlet bushing pipe of anti-electric shock type electric water heater of the present invention curves M shape;

Fig. 4 is that the water inlet bushing pipe of anti-electric shock type electric water heater of the present invention curves inverted U-shaped version profile;

1, water inlet bushing pipe; 2, nut; 3, water inlet pipe and water outlet pipe sealing gasket; 4, water inlet pipe and water outlet pipe; 5, inner bag; 6, sleeve pipe; 7, bolt; 8, water inlet bushing pipe sealing gasket; 9, flat shim; 10, spring shim; 11, nut; 12, alignment pin; 13, heat-insulation layer; 14, shell; 15, water outlet bushing pipe; 16, through hole; 17, water stream channel; 18, delivery port; 19, dome dish; 20, electric heater.

The specific embodiment

Referring to Fig. 1, whole electric heater is used mark 20 chief representatives.In order to overcome the external existing defective of insulation tube, and satisfy the length L＞53r of insulation tube ²Requirement, thereby guarantee to reach the requirement of safety standard.The technical scheme of one of embodiments of the invention is: water inlet bushing pipe 1 is the combining form of straight tube and sleeve pipe 6, its structure is: a sleeve pipe 6 body portion cover dress of bushing pipe 1 in inner bag 5 of will intaking arranged, two water pipes 1,6 in its end face junction by bolt 7, nut 11 is fixing, two water pipes 1,6 also can be integral type, water inlet bushing pipe 1 has through hole 16 near on the tube wall at top, two water pipes 1, space between 6 is a water stream channel 17, the delivery port 18 of sleeve pipe 6 lower ends communicates with inner bag 5, water inlet bushing pipe and sleeve pipe 1,6 insulation tubes of making for insulating materials, the insulation tube that water outlet bushing pipe 15 is made for insulating materials, above-mentioned insulation tube only are that inside pipe wall is that insulating materials also can.On the tube wall of water inlet bushing pipe 1 and the water inlet bushing pipe 1 of junction, water inlet pipe and water outlet pipe 4 lower end, a dome dish 19 is arranged, match with external screw thread on the water inlet pipe and water outlet pipe 4 by nut 2 at this dome Pan19Chu water inlet bushing pipe 1 is fixed.

The water inlet route is: in water inlet bushing pipe 1 lower end import → water inlet bushing pipe 1 pipe → and top through hole 16 → water stream channel 17 → delivery port 18 → inner bag 5.As long as above-mentioned current route satisfies L＞53r ²Requirement get final product (r is pore radius in the water inlet bushing pipe 1).Adopt said structure, increased the meander length of current routes, satisfied safe requirement.

Referring to Fig. 2, in order to satisfy L＞53r ²Requirement, this is that into water bushing pipe 1 is made the version of square frame shape, has both utilized the space of inner bag 5, has satisfied the requirement of insulation tube length again.

Referring to Fig. 3, this is that into water bushing pipe 1 is made the version of picture " M " shape.

Referring to Fig. 4, this is that into water bushing pipe 1 is made down the version of " U " shape.

In the above-described embodiments, all be in order to increase the length of water inlet bushing pipe 1, and the various constructive variation that adopt, the version of water inlet bushing pipe 1 of the present invention be not limited only to above-mentioned several for example, it can have many variations and remodeling, and does not exceed essential scope of the present invention.

Claims (7)

1. An anti-shock electric water heater, which includes a shell, a liner, an inlet and outlet pipe, an outlet liner and an inlet liner, characterized in that: the water inlet liner is an insulating tube, and its body is hidden in the In the inner gall cavity. 2. The electric water heater according to claim 1, characterized in that: the water inlet liner in the liner is in the shape of straight pipe, spiral pipe, U shape, M shape, curved shape or a combination of straight pipe and casing. 3. The electric water heater according to claim 2, characterized in that: the combined structure of the straight pipe and the sleeve is: a sleeve covers the pipe body part of the water inlet straight pipe in the liner, and the two water pipes One-piece or fixed by fastening connectors on the joint surface, there is a through hole on the pipe wall near the top of the water inlet straight pipe, the gap between the two water pipes is the water flow channel, and the water outlet at the lower end of the sleeve is connected to the inner tank , the above-mentioned two water pipes are insulating pipes made of insulating materials. 4. The electric water heater according to claim 1, characterized in that: the outlet liner is an insulating pipe made of insulating material. 5. The electric water heater according to claim 3, characterized in that: the straight water inlet pipe and the sleeve pipe are fixed at the joint at the top by bolts and nuts. 6. The electric water heater according to claim 3, characterized in that: there is a convex disk on the pipe wall of the water inlet liner at the junction of the water inlet liner and the lower end of the water inlet and outlet pipes, and the nut is passed through the convex disk. Cooperate with the external threads on the water inlet and outlet pipes to fix the water inlet liner. 7. The electric water heater according to claim 1 or 2 or 3 or 4, characterized in that: the length L of the water inlet liner and the water outlet liner from the water inlet to the water outlet should satisfy L>53r ² .

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