CN1292482A

CN1292482A - Safety electroheating type water-heater

Info

Publication number: CN1292482A
Application number: CN 99120926
Authority: CN
Inventors: 党坤选; 路英梅
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-09-24
Filing date: 1999-09-24
Publication date: 2001-04-25

Abstract

The present invention discloses a safety electroheating water heater, and is characterized by that the covering shell of said water heater is made of insulating material, mounted between cold-water interface, hot-water interface and water tank which are connected by means of insulating pipe, and the internal diameter of said insulating pipe is 6-12 mm, and the length of said insulating pipe is 0.6-6 m. The resistance value after said pipe is charged with running water is not less than 1 magohm.

Description

A kind of safety electroheating type water-heater

The invention discloses a kind of safety electroheating type water-heater, belong to household electrical appliance technical field.

Existing electroheating type water-heater generally is by electrothermal tube or other electric heating method water to be heated to preference temperature from inflow temperature to flow out the use for the people in metal water drum, and the cold water that is made of metal, hot water are taken over and directly is welded on the water drum usually.According to standard code, metal materials such as water drum, outer cover, Inlet and outlet water adapter must link to each other with the earth connection in the power supply lead wire, and the earth connection in the power line links to each other with the earth through socket, and ground connection must be reliable.In normal use, the ground wire no current.When electric leakage took place water heater contingency, electric current flowed directly into the earth by low-resistance ground wire, thereby guaranteed human body safety.

In fact, because historical reasons, a big chunk of the existing house of China is not installed good earthing or grounding means when building originally.In addition, also have some sockets, tend to cause the empty phenomenon of inserting of ground wire owing to design, production are lack of standardization.Like this when water heater just in case when electric leakage took place, high voltage then may spread out of through conductor materials such as entery and delivery port or cases human body is caused electric shock, this situation all has generation every year.

Purpose of the present invention will provide a kind of safety electroheating type water-heater exactly, and this safety electroheating type water-heater is unreliable or do not have ground wire and also can guarantee human body safety under the condition that heater leaks electricity ground connection, overcomes existing electric heater above shortcomings.

Below with reference to accompanying drawing technical scheme of the present invention is described.

Accompanying drawing one is a structural representation of the present invention, being described as follows of each symbol among the figure:

The 1-case, 2-electric heater, 3-water drum, 4-water outlet mouthpiece, 5-insulation tube, 6-Hot water outlet, 7-cooling water inlet, 8-insulation tube, the 9-interface of intaking, the 10-wall. Ginseng According to accompanying drawing one, a kind of safety electroheating type water-heater is fixed in human body behind the upper installation site of wall [10] The case that can touch [1] is made by insulating materials, by the water inlet interface [9] on the water drum [3], go out Water interface [4] is to being installed between cooling water inlet [7] on the case [1], the hot water inlet [6] respectively Connect the insulation tube [5] that one section bore is thin, length is long, caliber and the length of insulation tube [5] are joined Than satisfy be full of two ends behind the running water in the pipe resistance value greater than 1 megaohm; Water flow-path is running water Enter water drum [3] from cooling water inlet [7] through insulation tube [5], the heat after electric heater [2] heating Water flows out to hot water outlet [6] through insulation tube [5].

Case [1] is made with injection molding or with insulating materials such as acrylic, fiberglass.

Under the normal temperature, resistivity of water is about 5000 Europe centimetre from the beginning, is full of as setting insulation tube [5] that the resistance value at two ends is 1 megaohm behind the water, and when insulation tube [5] internal diameter was φ 6, then its length was about 0.6 meter; When insulation tube [5] internal diameter was φ 8, then its length was about 1 meter; When insulation tube [5] internal diameter was φ 10, then its length was about 1.56 meters; When insulation tube [5] internal diameter was φ 12, then its length was about 2.26 meters.Consider the resistance to water-flow characteristic of water heater, guarantee water-filling simultaneously after resistance value greater than 1 megaohm, insulation tube [5] internal diameter is with φ 6～φ 12, length is advisable with 0.8～6 meter.

Adopt technique scheme, when unreliable, if electric heater [2] is just in case leak electricity, because case [1] and insulation tube [5] material are insulator, leakage current can only pass through the water outflow in the insulation tube [5] ground wire grounded.Because the resistance value of water-filling insulation tube [5] is set in more than 1 megaohm, and the human body resistance value is about 0.2 megaohm, according to the series circuit Ohm's law as can be known, even leakage voltage is 220 volts, the voltage that acts on human body also has only about 220 volts sixth, be lower than safe voltage, therefore can not cause electric shock the people.Thereby it is unreliable or do not have ground wire and just in case when electric leakage takes place, also can not cause human injury's purpose ground connection to have realized.

According to technical scheme of the present invention, as the resistance value of insulation tube [5] is set in 5 megaohms, the maximum voltage that then acts on human body is no more than 10 volts.

In the technical scheme of the present invention, insulation tube [5] preferably adopts fibre reinforced plastic tube, when it is longer, and can the crooked placement of plate-like in the shape of a spiral in case [1] inside.When designing this pipe, should consider that caliber can obtain bigger resistance value when thin, consider the resistance to water-flow characteristic of this pipe simultaneously again, generally getting bore is φ 6～φ 12, pipe range obtains according to the resistance value calculating of resistivity of water and needs from the beginning, is advisable to be no more than 6 meters usually.Insulation tube [5] also can adopt plastic injection-moulded mode to make maze-type structure shown in figure two, adds rubber blanket between two maze-type structure unit of plastics and constitutes water route insulated from each other respectively, can obtain comparatively compact structure like this.

Claims

1. a safety electroheating type water-heater is characterized in that being fixed in wall [10] and goes up the case [1] that installation site descendant's physical efficiency touches and made by insulating materials, connect one section insulation tube [5] by the water inlet interface [9] on the water drum [3], water outlet interface [4] respectively to being installed between cooling water inlet [7] on the case [1], the hot water inlet [6], the caliber of insulation tube [5] and length proportioning satisfy be full of two ends behind the running water in the pipe resistance value greater than 1 megaohm; The current journey is that running water enters water drum [3] from cooling water inlet [7] through insulation tube [5], flows out to hot water outlet [6] through electric heater [2] heated hot water from insulation tube [5].

2. it is characterized in that by the described a kind of safety electroheating type water-heater of claim 1 case [1] makes with injection molding or with insulating materials such as acrylic, fiberglass.

3. it is characterized in that by the described a kind of safety electroheating type water-heater of claim 1 insulation tube [5] is full of resistance value behind the water greater than 1 megaohm, internal diameter is advisable with 0.6～6 meter with 12 millimeters of φ 6～φ, length, material is preferably fibre reinforced plastic tube, the crooked placement of plate-like in the shape of a spiral in case inside when longer; Insulation tube [5] also can adopt plastic injection-moulded mode to make maze-type structure shown in figure two, adds rubber blanket between two maze-type structure unit of plastics and constitutes water route insulated from each other respectively, can obtain comparatively compact structure like this.