CN2540594Y - Quick heating type water heater - Google Patents

Abstract

The utility model relates to a fast thermal water heater, which belongs to an electric appliance field. At present, the fast thermal water heater has the defects that a heating pipe is easy to burst, water leakage, electric leakage, the life is short and the heating efficiency is low. When the water is instantaneously cut off or the water and the gas are mixed to supply the water, the defects are more protruded. The utility which uses an armored and insulated heating device is arranged in a closed water tank which capacity is smaller than 1 Liter, a water inlet of the water tank is equipped with a flow-limiting valve, which is used to regulate the water temperature in order to obtain a pressure difference, and the controlling of the heating device is completed through driving a bellow, a magnetic-sensing element and a heat-sensitive element, thereby the water heater has the advantages that the heating is safe and efficient, the service life is long, the heat efficiency is improved, and the changing of the water temperature is more subdued.

Description

A kind of instantaneous water heater

The instantaneous water heater belongs to household electrical appliance technical field.

Common on the market instantaneous water heater adopts a kind of many of heating tubes that evaporate one deck carbon film or metal film (hereinafter to be referred as heating film) at the heat-resisting porcelain tube or quartz ampoule (hereinafter to be referred as the Guan Ji) outer surface of hollow to be together in series at present, allows heated water flow through the heating tube of hollow fast.Water is connected the heating tube power supply by in the process of heating tube, and the heat that the heating film energising of heating tube outer wall produces is finished heat exchange by the Guan Ji as heat conduction and insulation usefulness, reaches the purpose to the water Fast Heating.When current stop, cutting off the electricity supply, heating stops.Fill insulant material between heating tube and shell is to reduce and extraneous heat exchange.

This class instantaneous water heater exists some shortcomings to make that its security is relatively poor, be subjected to certain influence service life, and the thermal efficiency is lower.What time following main existence is: 1, because heating tube is subjected to its structure, and the thermal conductivity of material and the influence of production technology, therefore its heating power need just can reach enough big heating power with many connections generally all less than 1KW.This class instantaneous water heater often adopts the airtight and watertight padding of flexible materials such as silicon rubber loop as rigid attachment joint between the tube and tube.These materials easily take place aging in long-term use, aging quickening when high temperature especially, and the elasticity variation easily makes connecting joint leak.The outer surface of heating tube is exactly the heating film and the insulation material of energising heating usefulness, its two make moist after, very easily leak electricity.2, take place that moment cuts off the water supply or during air water mixings water supply state (this water supply state is common especially in high rise building water supply) at water supply line,, make the intensification rapidly of heating tube surface because the heat that heating tube produces can't take away rapidly by flowing of water.For guaranteeing that heating tube has certain mechanical strength, the tube wall of heating tube all has certain thickness, because the good material of insulating properties nearly all is the non-conductor of heat, therefore there is the bigger temperature difference in the interior outside of tube wall, when coming water once more, hurried cooling can cause heating tube to produce the crack, and explosion just easily takes place with the passage of time.3, because heating film belongs to different materials with the pipe base, thermal coefficient of expansion is inconsistent, and heating repeatedly, cooling can make heating film and Guan Ji come off gradually, reduced the contact area of heating film and Guan Ji, reduced heat conduction efficiency, heating film is further heated up, the heating film temperature raises, its the two thermal expansion amount differs bigger, make the obscission aggravation, after destroying fully, heating film is overheated to be burnt.Aspect in addition, the heating film and the basic different coefficient of expansion of pipe also can allow the heating film drawing crack, and conductive section diminishes, and heating film burns because of hot-spot.4, the Guan Ji of heating tube is the non-conductor of heat, in heating process, higher as the heating film temperature of thermal source, though most of heat is by Guan Jiyu water generation heat exchange, but still some heat with extraneous heat exchange takes place by insulation material, thereby reduced the thermal efficiency.

The purpose of this utility model provides a new technical scheme, makes the instantaneous water heater safer, longer service life, and the thermal efficiency is higher, more economical practicality.

The utility model is achieved in that

Airtight and armouring shell and heating wire are that the heater element that insulate fully is immersed in a volume fully less than (being designated hereinafter simply as water tank) in one liter the closed container with the enough big armouring of a power, certain position at water tank has welded a water inlet pipe and an outlet pipe, two water pipes split two sides of heater, the height of the water-in and water-out mouth of pipe in water tank equates, after the setting of its mouth of pipe height should make water tank water intake, its liquid level all can flood the heating part of heater element fully under any state.Appropriate location outside water inlet pipe is positioned at water tank installs a flow-limiting valve additional.Designed a special bellows in the bottom of water tank, the diaphragm of a carrying magnetic material is housed in the bellows, a side of bellows interior diaphragm connects with the water inlet threeway, and opposite side connects with water tank or outlet pipe.Between bellows interior diaphragm and water tank, adorn a magneto sensor and temperature-sensitive element.Between the bellows of diaphragm and water tank one side, adorn a back-moving spring.

Adopt above design back because heater element is immersed in the heated water fully, the heat of its generation can be similar to be thought and is absorbed by water fully.Adopt its volume of Compact Design rear water box very little, the surface area of its heat radiation is also very little, and its surface area is close with above-mentioned instantaneous water heater's heating tube total surface area, and the water temperature after being heated simultaneously is less with the extraneous temperature difference, thereby has improved the thermal efficiency.Because there be not the influence of the different coefficients of expansion of material to heater element in above design, so improved its security and life-span.The water that stores in the water tank also can play the effect of heat buffering.Heater element and leaving water temperature are changed more become mild.The setting of inlet tube and outlet tube open height can avoid moment to cut off the water supply in the water tank, heater element " dry combustion method " do not take place is crossed cause thermal damage under the gas-vapor mix water supply state.

The concrete structure of utility model is provided by following embodiment and accompanying drawing thereof.

The main internal structure of instantaneous water heater is by water tank (1) among the embodiment; Water inlet threeway (2); Water inlet pipe (3); Outlet pipe (4); Choke valve (5); Diaphragm (6); Magnet steel (7); Magneto sensor (8); Temperature-sensitive element (9); Spring (10); Heater element (11) is formed.

Describe its working condition in detail below in conjunction with accompanying drawing.

After opening the inlet valve of supplying with water heater, from the water of water supply network band pressure through water inlet threeway (2), choke valve (5) water inlet pipe (3) throttling is laggard goes into water tank (1), water just has been full of whole water tank after blink, fully submergence overflow from outlet pipe (4) behind the heating part of heater element (11).Connect water heater power supply, because the throttling action of choke valve makes the pressure of intake pressure and water tank or outlet pipe produce pressure reduction, this pressure reduction promotes diaphragm (6) and moves up, magnet steel on the diaphragm (7) also moves up, and the power supply that signal of telecommunication rear drive controller is connected heater element is measured and converted to the signal that move the magnet steel position by magneto sensor (8).After the heater element work, hot water constantly overflows from outlet pipe.Regulate choke valve and can reach the purpose that adjusts coolant-temperature gage.After closing the water heater inlet valve, intake pressure disappears, pressure reduction disappears between water inlet pipe and water tank or the outlet pipe, diaphragm resets downwards in the acting in conjunction of spring (10) and gravity and diaphragm recuperability, magnet steel on the diaphragm also resets, and converts signal of telecommunication driving governor after its change in displacement is measured by magneto sensor to and cuts off the heater element power supply.

Moment takes place when cutting off the water supply in water heater in the process of water inlet heating, the air in the water inlet network in the pipeline still has pressure, because gas density is little, is gathered in the top of water tank, discharges by outlet pipe, still remains with the water that floods heater element fully in the water tank.Though this moment since the existence of pressure reduction make heater element still be in to add and pine for, the interior remaining coolant-temperature gage of water tank is risen rapidly, convert the signal of telecommunication to after temperature-sensitive element (9) is measured, when the signal of telecommunication reached a certain setting value, the power supply that controller action cuts off heater element stopped heating.The phenomenon of cutting off the water supply disappears or water temperature when being reduced to a certain setting numerical value, and controller just moves and makes heater element recover heating.If take place be air water mixings water supply state the time, then gas is discharged earlier, water is stayed in the water tank after exceed the design liquid level ability and is overflowed through outlet pipe.Water in the water tank can also make the variations in temperature of water heater water outlet more become steady.

Claims (4)

1, this instantaneous water heater is by water tank (1); Water inlet threeway (2); Water inlet pipe (3); Outlet pipe (4); Choke valve (5); Diaphragm (6); Magnet steel (7); Magneto sensor (8); Temperature-sensitive element (9); Spring (10); Heater element (11) is formed, the volume that it is characterized in that water tank (1) is less than 1L, water inlet pipe (3) and the mouth of pipe height of outlet pipe (4) in water tank equate, and be greater than or equal to the height of heater element heating part, there is a special bellows to be used to measure the pressure reduction of water-in and water-out, also built-in temperature-sensitive of bellows and magneto sensor.

2, instantaneous water heater according to claim 1, its water inlet pipe (3) and outlet pipe (4) can be arranged at the optional position of water tank, but after its mouth of pipe height that is positioned at water tank can make the water tank water-filling static, liquid level can flood the heating part of heater element fully under the normal pressure.

3, special bellows according to claim 1 is arranged on the water tank outside, the below of liquid level behind the water tank water-filling.Pressure reduction and variation of temperature are converted into corresponding signal of telecommunication output in the bellows.

4, in the special bellows according to claim 1 diaphragm is arranged, with magnet steel or be the magnetic diaphragm, pressure reduction is converted to the displacement of diaphragm on the diaphragm.