CN1213792A - Display with dual cabinet for fire protection - Google Patents

Abstract

A display device comprises a cathode ray tube, a main circuit, a bottom bracket, a first exterior case made of fire-resistive material for controlling a fire that may break out at the main circuit or the back side of cathode ray tube(CRT), and a second exterior case made of nonfireproof material to cover the first exterior case and form the surface.

Description

Display with dual cabinet for fire protection

The present invention relates to have the display of cathode ray tube (CRT), the vision signal of importing from computing machine shows at this display by cathode-ray tube (CRT).The invention particularly relates to such display: its first shell can tackle burning, second shell that display interior may cause and form extraneous adornment and coat first shell.

In general, display comprises that roughly the CRT, of a displayed image is installed in a shell and a bracing frame that main circuit part under the CRT, is partly covered CRT and main circuit.

As this area professional be familiar with, such display will be made into electromagnetic screen and fire-type, and meets environmental protection standard.For safety, display should be able to be handled the burning that may cause in the shell.

Because various electrified bodys and circuit component are arranged in the display, so its inside has the factor that causes burning.For this reason, carried out the real application research of fire-retarding device, especially the research aspect the use electronic component.For electric wire or cable, the sheath of certain element wherein is impaired may to cause short circuit and on fire.Impaired for preventing sheath, extrudate just can be installed after its sharp-pointed edge is removed on every side.

To being arranged, to handle by the possible electronic component that ignites; itself and extruding object are separated; or use wire support or cable hoop (TIE) that lead or cable and extrudate are not constituted to contact to prevent because vibration causes sheath impaired, operating overload input protection fastp-acting fuse or assurance PCB template have certain intervals to prevent the burning of PCB.

In other method of fire protection, comprise: guarantee flammable interelement spacing,, eliminate factor on fire with anti-high temperature circuit, thermal resistance element or insulator with making element from flame-out (self-extinguishing) material.

Promptly use such method of fire protection, in fact can not realize preventing fire fully, because still have reason of fire in display interior.

Reason of fire is divided into electric reason and physical cause.Electric reason is meant that overload or element owing to long-term the use caused damage, in addition, also comprise the maloperation that the overload protection element occurs.

Physical cause on fire comprises high-tension cable or electric wire because of vibration and other element friction, causes sheath impaired and cause short circuit.

Burn when the outside is spread in the display interior that many reasons of fire cause, may injure human body, and progressively upgrade to calamitous fire.

Now, display is widely used as the necessity of computer fittings.In this case, if after work, place the display interior in the office to cause burning and spread to the outside that this may cause big fire.

For this reason, now developed the protection that burning spreads to the outside to display interior.Up to the present, the method for unique burning of shielding fully is exactly a shell.

Specifically, display casing gets up all element covers, but the element of these fire hazards is with making from putting out fire proofing.Forming the burning that the appearance of display can stop display interior to cause with such inflaming retarding shell spreads to the outside.

General fire proofing is meant metal or asbestos.Yet fire proofing increases product price, otherwise still saves this design as the display of office equipment, and its commercial usability is reduced.

Therefore, under the situation of considering weight, design and production in enormous quantities, display casing is made with flame retardant plastics.For the flame retardant plastics shell, its material must meet the flame retardant rating that is made of a plurality of fire prevention levels in the UL standard.Yet since in element the difference of this fire proofing, when especially relating to the cost of product in production in enormous quantities, it belongs to very expensive a kind of.

Inflaming retarding shell has shortcoming in the design of product, and in addition, shell will have the inner outwards hole of distribute heat of slave unit inevitably, but, for purpose of safety, in other words, preventing that flame from leaking or preventing the human electric shock from should limit very narrow and smallly to these holes.

Specifically, in the UL standard, the maximum length that forms the hole on the shell is limited in the 4.78mm, and the element or the combustible constituent quadrature of these holes and product inside are limited within 15 °.Be that it is designed to suppress the electrical short that flame leaks outside or prevents to be caused by the object that the outside enters just in case inside is on fire.

For example, when these holes surpassed this standard of display casing, the product of wearing resemble the necklace when display monitor central monitoring system uses may fall in the hole, and this may cause and the internal electric source conducting that human body may be subjected to fatal harm in this case.This reason limits these holes can not exceed standard.Qualification is also arranged in the installation of peripheral hardware or equipment.For safety, original these holes that form do not allow it to be above standard in the shell, thereby absolute restriction is arranged in display design, simultaneously, need very complicated manufacturing course in the shell pressing mold.

Restriction in the structural change causes commercial profit almost not increase again, and very the manufacture process of difficulty has also produced the multiple factor that reduces output simultaneously.

A kind of electromagnetic wave shielding case is arranged in the prior art, and this case is contained on the position that flammable factor is arranged in the shell, however this can not be used for the fire prevention because it just shields harmful electromagnetic parts.Shielded box is designed to only block produce has a large amount of electromagnetic waves to see through its outer wall, can not block burning with this shielded box and spread to the outside.

Owing to these reasons, spread to the outside for preventing burning, need only to make shell with fire proofing.Because expensive flame-retarded plastic rises the cost of product, and does not almost change in the design.

Therefore, in order to overcome these shortcomings of the prior art, the purpose of this invention is to provide a kind of display, it can be blocked the burning that display interior may cause and outwards spread, reduces cost of products, realizes that the beautiful design of display casing is not subjected to the restriction of safety standard again simultaneously.

For finishing purpose of the present invention, the invention provides the double casing of display, inner casing is a fireproof, in order to tackle burning and protection human body; Shell then is non-fireproof, thereby has obtained the reduction of cost of products and the improvement of design.

An aspect of of the present present invention provides a kind of display, it has the cathode ray tube (CRT) of an energy imaging, be useful on the main circuit part of control power supply and circuit in the CRT bottom, with the under(-)chassis that places below the main circuit, this display also comprises: with first shell that fire proofing is made, be used to tackle the burning that CRT rear portion or main circuit part may cause; With the non-second fire-retardant shell, it covers first shell and forms appearance.

These characteristics of the present invention and its its feature will more clearly understand from following description taken in conjunction with the accompanying drawings, wherein:

Fig. 1 is a skeleton view of implementing display of the present invention;

Fig. 2 is a decomposition diagram of implementing display of the present invention;

Fig. 3 is shown in the assembling sectional view that display cuts along A-A ' line among Fig. 2;

Fig. 4 is shown in the assembling sectional view that display cuts along B-B ' line among Fig. 2;

Fig. 5 is shown in the sectional view that display cuts along C-C ' line among Fig. 4:

Fig. 6 is the skeleton view of explanation first shell of the present invention;

Fig. 7 is the decomposition diagram of another embodiment of the present invention's first shell;

Fig. 8 a is a decomposition side view of explaining double casing of the present invention;

Fig. 8 b is the side cross-sectional view of explanation double-layer shell structure of the present invention;

Describe the preferred embodiments of the present invention below with reference to the accompanying drawings in detail, to illustrate the present invention.

With reference to figure 1 and Fig. 2, display of the present invention is roughly by forming with the lower part: the CRT10 of imaging; Provide and control power supply and signal so that the main circuit part 20 that image shows on CRT10; For reaching first shell 30 that the purpose that stops propagation of flame covers main circuit part 20, second shell 40 with the formation product design being installed in first shell, 30 outsides; Be installed in the underframe 50 below the main circuit part 20.Kind according to product can be served as base with a support 60.

CRT10 makes with glass, and this glass is fire proofing material.The CRT that the front is useful on installation is with 11.The suspension ring 13 of belt are provided on four angles of 11 at CRT, with fixing with screw 12.

As shown in Figure 3, CRT10 is fixed on the inside surface of the front shroud 41 that forms second shell 40.In order to make CRT10 install firmly, provide CRT support 14 simultaneously.

Second shell 40 is made by two parts that are called front shroud 41 and back cover 42, connects at last in assembling process.The non-flame-retarded plastic plastic pressure forming of 41 and 42 usefulness.

In the equipment process, at first the fastening part 14a of the suspension ring 13 of the belt of CRT10 and CRT support 14 is made into simultaneously and places four inner four jiaos fastening pillars 43 of front shroud 41 to match, and they tighten together with screw 12.Provide anti-magnetized coil 15 at the rear portion of CRT10.

Formation second shell 40 below front shroud 41 is above main circuit part 20 is fixed on.Main circuit part 20 roughly is made up of circuit board 21 and grillage 22, and grillage 22 is supporting circuit board 21.As shown in Figure 2, the various circuit components 23 that may cause the condition of a fire are installed on circuit board 21.

Circuit component 23 is installed on the circuit board 21, and circuit board 21 is fixed on the circuit board support 22, and bottom bracket 50 quilts are with being fixed on the front shroud 41 as screw 24 this fastening means.

Under this confined state, have after the electric wire 25 of anode cable or wiring finish, first shell 30 just is installed.

First shell 30 is made by metal fire proofing material (for example aluminium), because its major function is to stop spreading of fire.In addition, for the rear portion that covers CRT10 and inflammable main circuit part 20, as shown in Figure 6, first shell has top board 31, side plate 32 and back plate 33.First shell 30 can constitute an integral body as shown in Figure 6, or is made up of top board 31, side plate 32 and back plate 33 respectively as shown in Figure 7, and is fastening with screw 34.Therefore, first shell 30 is fixed on the rear portion of CRT10 and inflammable main circuit part 20.

With reference to figure 4 and Fig. 5, the connected mode of first shell 30 is such, and side plate 32 closely contacts with the rear surface with the side surface of the grillage 22 of main circuit part 20 with back plate 33.In this complete installation, the coupling part 31a of top board 31 and the 14b of CRT support 14 match.

With several screw 35 fixedly connected part 14b and 31a, and the side plate 32 of first shell 30 and back plate 33 are fixed on the side surface and rear surface of grillage 22.

When first shell installs fully, please note the rear portion of CRT10 and have the main circuit 20 of inflammable factor to be housed in first shell 30.In this structure, if produce the condition of a fire, flame is stoped by first shell 30, in order to avoid spread to the outside.Here, CRT20 is made by glass, and it is placed in the front of first shell 30, spreads forward to stop flame.Bottom bracket 50 is placed on below the circuit board support 22, spreads downwards to stop flame.

In the prior art, CRT10 and bottom bracket 50 also are used for fire-retardant.In this embodiment, first shell 30 that is used to stop the burning diffusion has been installed in addition, has outwards been spread with the rear portion that stops CRT20 and the top of main circuit board and the flame of sidepiece.

Simultaneously, first shell 30 has several holes 36, is used to discharge the heat that various circuit components produce.Irregular hole is also arranged in the joint.The manufacturing of louvre 36 meets the UL standard, and for circular hole, diameter is 4.78mm, and for rectangular opening, its diagonal line is 4.78mm, thereby makes first shell 30 prevent that the function of propagation of flame from not reducing.

Shown in Fig. 8 a and 8b, the bonnet 42 that second shell 40 has been installed is to be used for covering first shell 30.Here, as shown in Figure 2, screw 44 passes the screw hole 42a on bonnet 42 both sides, makes protecgulum 41 and bonnet 42 be fixed together.This technology is that everybody knows, and is not giving unnecessary details.At last, base 60 is used for fixing bottom bracket 50, so far, and installation.

Use this structure, first shell stops the flame that results from inside outwards to spread, and the thing outside preventing for example necklace falls in the shell.In addition, first shell prevents that flame from overflowing, thereby supplies with the harmless display of user.

First shell has been arranged, and the material of product casing is with regard to available non-fireproof plastics manufacturing.This can reduce cost of products greatly, and this is because the price of non-fire proofing material is lower than the cost of fire proofing.Run into when producing in enormous quantities, the reduction of cost can bring sizable economic benefit, thereby supplies with the both economical product of user.

The flame-retardant degree of sheathing material is relevant with the thickness of product (or parts), in the prior art, in order to be suitable for fire prevention, product must be done thicklyer, and in the present invention, because first shell finished fire-proof function, the thickness of the shell of outside can only be half of common flameproof case, has further reduced cost of products.

Be more significantly, the design of product can be more diversified and exquisiter, and this is because first shell is born this function of fire prevention, to such an extent as to shell is modified to such an extent that more meet designer's design or consumer's needs.In other words, during hole on forming shell, can not too go the standard of taking care, thereby realize various design for aesthetic.

Hole on the shell can be bigger than the size of stipulating on the safety standard, thus the inner heat that produces of releasing arrangement very expediently.This has also removed high-temperature heat-resistance element or cooling element, has further reduced cost of products.

According to European countries generally adopt about the restriction deleterious material regulation (as TCO ' 95), must use harmless fire proofing material, so just increase cost of products, yet, the invention provides more economical product, used harmless, cheap, non-fireproof material.The present invention has increased the competitive power of product on price, and the product to environment " close friend " is provided.In addition, when sheathing material is used for making or for reusing when melting, can produce harmful gas, free from environmental pollution.

First shell of the present invention can be used as a conductor, makes because it is a metal material, and therefore, it can be used as shielding electromagnetic waves.

According to above description, suprastructure of the present invention can stop the fire spread that results from inside to be gone out, and has reduced cost of products simultaneously.Further, the profile of shell is not subjected to the restriction of safety standard, can allow design more attractive in appearance.

For the reader, obviously, the previous description of the present invention is that the variation and the modification that do not exceed the scope of the invention have many kinds for the purpose that the present invention will be described and be convenient to the present invention is understood.Therefore, the scope of the present invention that should point out by additional claim rather than previous explanation, all variations in the scope suitable with claim are included in the claim scope.

Claims (12)

1. a display has a cathode ray tube (CRT), by this CRT display image, provides a main circuit below CRT, is used for controlling power supply and circuit, and a bottom bracket that is placed on below the main circuit part, and this display is characterised in that also and comprises:

-the first shell is made by fire proofing material, is used to tackle the condition of a fire that may result from CRT rear portion or main circuit part.

-non-fireproof second shell is used to cover first shell and forms appearance.

2. the display in the claim 1 is characterized in that first shell of installing partly covers CRT rear portion and main circuit with the front portion of CRT and the bottom bracket below the main circuit part, stops will result from the inner condition of a fire, prevents to spread out.

3. the display of claim 1 is characterized in that first shell is a metal.

4. the display of claim 1 is characterized in that second shell is connected by front shroud and back cover, is made by non-fireproof plastics.

5. according to the display of claim 1, it is characterized in that first shell has the function and the fire-proof function of shielding electromagnetic wave.

6. according to the display of claim 1, it is characterized in that first shell has a top board, respectively there is side plate the top board both sides, and plate after.

7. according to the display of claim 1, it is characterized in that first shell is a unitary construction;

8. according to the display of claim 6, it is characterized in that first shell is a unitary construction.

9. according to the display of claim 6, top board, side plate and the back plate that it is characterized in that first shell forms respectively and is connected by connection.

10. according to the display of claim 1, it is characterized in that first shell made by alloy and nonmetallic materials.

11., it is characterized in that first shell made by alloy and nonmetallic materials according to the display of claim 6.

12. according to the display of claim 6, it is characterized in that first shell is made into to protect human body according to safety standard, and prevent that foreign body from falling into, to eliminate factor on fire.

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