CN2453633Y

CN2453633Y - Hollow and internal and external coding type electric heating element

Info

Publication number: CN2453633Y
Application number: CN 00225845
Authority: CN
Inventors: 谭干民
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-10-26
Filing date: 2000-10-26
Publication date: 2001-10-10
Anticipated expiration: 2010-10-26

Abstract

The utility model relates to an electric heating element which is provided with an element body (7). The element body (7) is provided with a bottom end cover (12), a top end sealing joint (6), and the overhung ends of two electrodes (5). One end of a ceramic inner core sleeve (1) is provided with two electrode holes (51), and the two electrodes (5) are put into the ceramic inner core sleeve. A metallic resistance heating body (2) is arranged on the ceramic inner core sleeve (1), and both ends of the metallic resistance heating body are connected with the electrodes (5). A protective sleeve (3) of high temperature insulation is arranged at the outside of the heating body (2). The protective sleeve (3) is arranged in a metallic outer sleeve pipe (4). an inner cooling metallic pipe (11) is arranged in the ceramic inner core sleeve (1). The interior of the metallic pipe is provided with a cavity (10), and the bottom end is provided with an opening. The element body (7) is also provided with a reflux pipe (9) which is used as a reflux structure. One end of the reflux pipe (9) is communicated with the inner cooling metallic pipe (11), and a port (14) on the other end is connected to the lower surface of the top end sealing joint (6).

Description

Hollow inside and outside cooling electric heating element

The utility model relates to a kind of be suitable for being immersed in the liquid and the electric calorifie installation realizing liquid is heated.

The existing electric heating element system that liquid heat such as oil, water are used makes after the draw, bend pipe, assembling by packing resistance wire and filling inorganic insulation powder in the metal circular tube into again; Because its heating partly can be immersed in fully and be heated in the liquid, thereby the electric conversion efficiency height, and easy for installation; But the drawback that this electric heating element exists has: 1, the inner heat resistance wire is little because of area of dissipation, working temperature is high, and is big with the extraneous temperature difference, so the life-span is short; 2, inorganic insulation powder end is through sintering, and its insulation resistance is little, and proof voltage intensity is low, and powdered object is easy to generate displacement, and when the energising heating outside metal tube is produced the bulbs of pressure; 3, metal tube filling inorganic insulation powder and behind the draw again line bend become the U type, the as easy as rolling off a log intercrystalline crack that causes the crooked position metal structure, this crackle is under the bulbs of pressure after the inner powder heating act on repeatedly, produce the trickle breakage of metal tube, outside liquid is entered in the pipe, under the situation of energising heating once more, produce a large amount of steam, and steam can't overflow, cause the metal tube explosion; Described three kinds of defectives all greatly affect the useful life and the security performance of prior art electrothermal tube.

The purpose of this utility model is, designs a kind of hollow inside and outside cooling electric heating element, and inside be hollow and use metal tube for cooling off, have heating area greatly, the characteristics of long service life.

The technical solution of the utility model is; described hollow inside and outside cooling electric heating element has element body; there is bottom cover this element body bottom and there are sealed interface and two electrode overhanging ends in the top; the structure of described element body is; one end of pottery inner core cover has two electrode holes and described two electrodes to be respectively charged into wherein; there are metal resistance heater and its two ends to be connected with described two electrodes respectively on the described ceramic inner core cover; there is the high temperature insulation protective sleeve described metal resistance heater outside; this protective sleeve places metal jacket pipe; its technical characterictic is that it is uncovered interior cool metal pipe for interior cooling cavity bottom that inside is housed in the described ceramic inner core cover.

Make below in conjunction with drawings and Examples and to further specify.

Description of drawings:

Fig. 1 is the positive TV structure of a kind of embodiment of the present utility model;

Fig. 2 be among Fig. 1 A-A to sectional structure;

Fig. 3 is a back TV structure embodiment illustrated in fig. 1.

Fig. 4 is the element body radial cross-section structure of the embodiment of board-like electric heating element.

In the accompanying drawings:

1-pottery inner core cover, the 6-sealed interface,

The 2-metal resistance heater, the 7-element body,

3-high temperature insulation protective sleeve, the 8-temperature tube,

The 4-metal jacket pipe, the 9-return duct,

Cooling cavity in the 5-electrode, 10-,

Cool metal pipe in the 11-, 14-return duct port,

The 12-bottom cover, the 51-electrode hole.

The 13-silicone rubber for sealing,

By Fig. 1 and Fig. 2 as can be known, the utility model has element body (7), and there is bottom cover (12) (referring to Fig. 3) this element body (7) bottom and there is the overhanging end (referring to Fig. 1) of sealed interface (6) and two electrodes (5) on the top; The structure of described element body (7) is (referring to Fig. 2); one end of pottery inner core cover (1) has two electrode holes (51) and described two electrodes (5) to be respectively charged into wherein; there are metal resistance heater (2) and its two ends to be connected with described two electrodes (5) respectively on the pottery inner core cover (1); there is high temperature insulation protective sleeve (3) described metal resistance heater (2) outside; this protective sleeve (3) places metal jacket pipe (4); its design feature is that it is the interior cool metal pipe (11) of uncovered (referring to Fig. 3) for interior cooling cavity (10) bottom that inside is housed in the described ceramic inner core cover (1).The radial cross-section of cool metal pipe (11) can be a rectangle shown in Figure 2 in described, also can be square, circular, ellipse or Else Rule and irregular geometry.Can also go up at sealed interface (6) one to two temperature tube (8) and associated components are installed, be convenient to thermometric.High temperature insulation protective sleeve (3) can be with compacting, the ceramic body made of sintering process, also available quartz glass body etc.Metal resistance heater (2) can adopt thicker resistance wire or larger area metallic resistance band, film, paper tinsel etc. are arranged.If between metal resistance heater (2) and the described protective sleeve (3) or between described protective sleeve (3) and the metal jacket pipe (4) or between the lug plate and ceramic inner core cover (1) of metal resistance heater (2), have the gap between ceramic inner core cover (1) and the interior cool metal pipe (11), then can be in described gap the high temperature insulation powder filler (the powder slurry drying when inserting forms) of filling inorganic material.Described electric heating element can be bar type (claiming a tubular type again) structure shown in Figure 1, also can be the various versions of plank frame prior arts such as (cross section as shown in Figure 4).

In order further to improve service behaviour of the present utility model, return-flow structure can be set on electric heating element, a kind of embodiment of this return-flow structure is provided with return duct (9) on described electric heating element top, one end of this return duct (9) is communicated with interior cool metal pipe (11) and the port (14) of the other end is located at the lower surface (referring to Fig. 3) of sealed interface (6), can make thus and be heated liquid formation shuttling movement, accelerate firing rate, simultaneously heat of the present utility model can fully be passed to and be heated liquid, self is effectively cooled off.Return-flow structure of the present utility model can also be other structure of prior art, as as described in demarcation strip is heated liquid with formation return flow line is set in the cool metal pipe (11), or adopt interior cool metal pipe (11) arranged side by side more than two or two to form backflow (circulating) passage that is heated liquid, or the like.

Design principle of the present utility model is, because adopted the inside and outside cooling structure of cooling cavity (10) in the band, under with constant power and other the same terms, this electric heating element can reduce half length (volume), or under same length (volume) and other the same terms, its power doubles; It has enlarged the element radiating area and has reduced the element raw materials consumption, in admissible space (volume), has increased product useful life.In addition, adopt the metallic resistance band, film, paper tinsel or thick heating wire are made heater, the element radiating face are enlarged and the principle that increases useful life is because electric heating element must have certain heating area under rated power, just to be arranged long useful life; And in resistivity one regularly, the length of metallic resistance line, band, film, paper tinsel also is under a certain amount of condition, if adopt the shape in the solid circles cross section of prior art electric heating body, electric heating element high material consumption not only, bring also that thermal capacity is big, the too high problem of element centre temperature, cause inaccurate, the element easy burn-out of external temperature control; The utility model has then enlarged heating area and area of dissipation, can effectively increase the service life, also owing to adopt the high temperature insulation protective sleeve (3) and the ceramic inner core cover (1) of pottery, its insulation resistance height, proof voltage intensity height, can not produce the powder offset phenomena, after the energising heating, can not produce the bulbs of pressure to metal jacket pipe, and metal jacket pipe is owing to no longer stand in original technical matters filling the powder draw and bend pipe again, so can not produce the localized metallic intercrystalline crack, do not have the inner bulbs of pressure in addition and act on repeatedly, the reliability and the life-span of metal jacket pipe improve greatly; Also, this kind structure is heated in the liquid, so electric conversion efficiency and prior art electrothermal tube are equally very high owing to making heater immerse fully; It can being made of one independent component, use and install all very convenient.

As known from the above, the utility model is a kind of hollow inside and outside cooling electric heating element, has the big and big characteristics of area of dissipation of heating area, and product thermal capacity is little, volume is little, long service life, and it is reasonable in design, and cost is low, be suitable for adding hot water, wet goods liquid, safe and reliable, install with easy to use.

Embodiment: according to the utility model electrical bar of accompanying drawing 1 to 3 and said structure, for being used for the 1.5KW electric heating device of certain domestic, electric water heater, its resistance 32 Ω, the about 6.8A of the operating current under the 220V supply voltage.Its manufacturing process is:

1, makes ceramic component: two electrodes (5) are packed in the electrode hole (51) of ceramic inner core cover (1) and the metallic resistance band is wrapped on inner core cover (1) outer surface and with its two ends crimping or be welded on the electrode (5) end to end, again described member is packed in the ceramic high temperature insulation protective sleeve (3), form ceramic component;

2, respectively weld metal outer tube assembly and interior cool metal pipe assembly: a, metal jacket pipe (4) assembling bottom cover (12) and welding, the sealed interface (6) that is welded again, welded and installed temperature tube (8) and form the metal jacket pipe assembly thereon; B, return duct (9) assembled and is welded in cool metal pipe (11) go up to form in cool metal pipe assembly;

3, general assembly: described ceramic component is put into the metal jacket pipe assembly, put into cool metal pipe assembly and welding again, cooling cavity (10) in electric heating element, forming thus, return duct port (14) is arranged on the sealed interface (6), can fill correlative by aforementioned technology when gapped between member, encapsulate silicon rubber (13) at last and promptly get product.

Claims

1, a kind of hollow inside and outside cooling electric heating element, it has element body (7), and there is bottom cover (12) this element body (7) bottom and there is the overhanging end of sealed interface (6) and two electrodes (5) on the top; The structure of described element body (7) is; one end of pottery inner core cover (1) has two electrode holes (51) and described two electrodes (5) to be respectively charged into wherein; there are metal resistance heater (2) and its two ends to be connected with described two electrodes (5) respectively on the pottery inner core cover (1); there is high temperature insulation protective sleeve (3) metal resistance heater (2) outside; this protective sleeve (3) places metal jacket pipe (4); it is characterized in that it is uncovered interior cool metal pipe (11) for interior cooling cavity (10) bottom that inside is housed in the described ceramic inner core cover (1).

2, the described hollow inside and outside cooling electric heating element of root root claim 1 is characterized in that, the port (14) of the other end that is communicated with interior cool metal pipe (11) as return duct (9) one ends of return-flow structure is located at the lower surface of sealed interface (6).

3, the described hollow inside and outside cooling electric heating element of root root claim 1 is characterized in that the radial cross-section of described interior cool metal pipe (11) can be a rectangle, also can be square, circular, oval or other geometry.

4, the described hollow inside and outside cooling electric heating element of root root claim 1 is characterized in that it can be tubular or the clavate structure, also can be slab structure.