CN2264965Y

CN2264965Y - Multiple load switch

Info

Publication number: CN2264965Y
Application number: CN 96216834
Authority: CN
Inventors: 何毅忠
Original assignee: Individual
Current assignee: He Yizhong
Priority date: 1996-07-01
Filing date: 1996-07-01
Publication date: 1997-10-15
Anticipated expiration: 2006-07-01

Abstract

The utility model relates to a load switch for on and off of a single phase line with overcurrent protection, which is composed of a base assembly and an upper cover assembly with L and N poles distinction, wherein, the switch with L pole structure is a fuse switch, and the switch with N pole structure is a load isolating switch; the outer side surface of the upper cover is provided with a fusing indicator lamp; when the utility model is used, power supply L is output through the fuse and power supply N pole is output directly provided that a fusing tube with corresponding specification is inserted into the L pole of the upper cover which is closed; when the fusing tube is fused, the fusing indicator lamp is lighted; when the upper cover is pulled up, the loading L and N poles are completedly separated from power supply. The utility model can conform to electrical distribution switch performance requirements of the civil construction electric design specification, and is suitable for single-phase source switches and single-phase distribution.

Description

Compound on-load switch

The utility model belongs to and plays connection in the uniline, disconnects the on-load switch with overcurrent protection.

In civilian, industrial or agricultural, low pressure uniline break-make and protection, long-term HK1, the HK2 type porcelain primer lid on-load switch of being extensive use of, patented product HK8 type on-load switch appears on the market in recent years, be characterized in that switch is when closing a floodgate, moulding lid can not take off, only when opening a sluice gate, moulding Gai Caineng takes off, Danger Electric shock risk takes place when having avoided the replacing fuse, and the HK8 type is the same with on-load switches such as HK1, HK2 types, and switch two utmost points are not distinguished phase (L), zero (N) utmost point, two extremely all adopt fuse to make short-circuit protection, and protective feature is poor; Patented product SF-2 type that Xi'an swan goose electrical apparatus factory has produced before in May, 87 and SF-2D type fuse type on-load switch, compare with above-mentioned on-load switch, structure all has bigger improvement, it divides base assembly and last cap assembly two partly, the power supply terminal and the load wiring terminal of switch two utmost points all are fixed on the base, power end socket and load end seat socket are riveted on respectively on the binding post base plate, L, the attaching plug of the N utmost point and load plug are installed on the loam cake medial surface, four fusion tube seats are riveted on respectively on four plug base plates, L, N extremely goes up and respectively inserts a FA4 type fusion tube, on the loam cake lateral surface, there is not metalwork, the accident of false touch live metal spare can not take place, the loam cake that closes a switch, Switching Power Supply L, the N utmost point is connected load by fusion tube respectively.SF-2D type on-load switch, is pasted two red plastic sheets and is made indicator-lamp cover at two indicator holes of loam cake excavation also at two fusion tube blown fuse indicators of two fusion tube installation place installings on the loam cake lateral surface, after the fusion tube fusing, the fusing indicator light is bright, and lampshade is luminous.SF-2 type on-load switch has the 6KA breaking capacity, allows the disjunction number of times not limit, have advantages such as good overload short-circuit protection characteristic, stability of characteristics, profile are little, attractive in appearance, safe and convenient to use; but SF-2 type and HK1, HK2, HK8 type on-load switch are the same; switch two utmost points do not have L, N polar region branch, and two extremely go up and all need install fusion tube and carry out overcurrent protection.

Circuit is when the overcurrent running status, and the protection of on-load switch has three kinds of situations: the one, and L extremely goes up fusion tube fusing in the switch, and this is normally satisfactory; The 2nd, still there is high potential in N utmost point fusion tube fusing in the switch on the circuit, and this is undesirable, as checking that electric shock accidents might take place line fault not drawing back on-load switch; The 3rd, L, N extremely go up two fusion tubes and fuse simultaneously in the switch, though this electric shock accidents can not take place, two fusion tubes that once fuse cause waste, increase the spare part expense, moreover L, two fusion tubes of the N utmost point be all after the fusing, fusing indicator light brightness deterioration, indicate not obvious, difficult judgment.

The National Standard Code for design of low voltage power distribution installations and wiring systems " in the 4010th regulation: " during with fuse protection distribution line, fuse should be installed in earth-free each mutually or each extremely go up.Be used for should not installing fuse on the zero line of zero connection protection."; The 864th regulation in Ministry of Construction's industry standard " civil buildings electrical design standard ": " short-circuit protective device should be installed in the distribution line earth-free each go up mutually."; On-load switch is not distinguished L, the N utmost point, in installing, overhaul and using, can bring inconvenience, there are not the electric specialty personnel in particularly civilian mostly, lack electrical instrument and instrument, and electric device is not selected the distribution colour of insulated conductor for use in strict accordance with GB when installing mostly, so be not easily distinguishable phase, zero line cause maintenance difficult, sometimes in addition misjudgment cause fault.It is feasible under some occasion that on-load switch is not distinguished L, the N utmost point, and when being introduced as overhead wire as the on-load switch power supply, L, N line may intersect perversion sometimes, and switch two is extremely gone up and all installed the fusion tube protection and can increase its protection degree of reliability; But under many occasions, L, N line are the impossible perversions that intersects, in newly-built uptown, adopt the three-phase and four-line power cable to each unit power supply of residential building, in each unit by consumer unit to each dwelling house single phase distribution, in relatively large civil buildings and industrial and mineral, also adopt three-phase and four-line power cable distribution, L is not distinguished in employing in this case, N utmost point on-load switch just has been not suitable for.

" civil buildings electrical design standard " the 8512nd regulation: " in TN, TT system; if when single-phase phase voltage loop head end is not installed the double-pole switch with the broken neutral line protection that detects neutral line voltage to earth, isolation electrical equipment then at different levels should disconnect N line isopen together."; Article 8611, regulation: " low-voltage distributing line should be installed following protection according to different faults classification and concrete engine request: (1) short-circuit protection; (2) overload protection; (3) earth fault protection; (4) broken neutral line error protection."; Article 8664, regulation: " short-circuit protective device should be installed in the distribution line earth-free each go up mutually."; Article 854, regulation: " for safeguard, test, maintenance and security needs should install isolation electrical equipment."; Article 855, regulation: " isolate electrical equipment and loop, place and live part should be able to be isolated effectively ... ".According to above-mentioned standard, the single phase distribution line switching should possess following condition: (1) switch L, N two utmost points can disconnect simultaneously, and are closed simultaneously; (2) switch two utmost points insulating power supply effectively; (3) have short-circuit protection and overload protection; (4) protect electrical equipment should be installed in L and extremely go up, can not be installed in N and extremely go up; (5) protective feature is good, stable; (6) switch can conveniently be adjusted the protection value in rated capacity.HK1, HK2 and HK8 type on-load switch can satisfy (1), (2), (6) bar, but do not meet (3), (4), (5) bar requirement, this switch should progressively be washed in a pan dai: SF-2 type (SF-2D) type on-load switch can satisfy (1), (2), (3), (5), (6) bar, but do not meet (4) bar requirement, mould the shell automatic switch and also do not meet (2), (6) bar requirement, the switch of above-mentioned 6 requirements does not also appear meeting fully in the market, this makes the electrical design personnel not have satisfactory switch available when design, so even the electrical design of present new building thing does not meet the requirement of " civil buildings electrical design standard " yet.

The utility model purpose is that a kind of compound on-load switch will be provided, this on-load switch improves on SF-2 type fuse type on-load switch and forms, compound on-load switch two utmost points have clear and definite phase (L), zero (N) polar region branch, its L is fuse type on-load switch, N load-break switch very very, during use, as long as install fusion tube on extremely at L, not be used in N and extremely go up the installing fusion tube, the panel switches that it can meet above-mentioned proposition should possess (1)～(6) condition.

The purpose of this utility model is achieved in that as Fig. 1. Fig. 2. and compound on-load switch is made up of base assembly (comprising base and each part mounted thereto) and last cap assembly (comprising loam cake and each part mounted thereto).On-load switch two is determined arbitrary very zero (N) utmost point in extremely, and another is phase (L) utmost point very, and the N utmost point can be located at the switch left-hand end, also can be located at right-hand end; The power end of switch L, the N utmost point and load termination line terminals are fixed on the base, L, N utmost point power end and four sockets of load end are riveted on four binding post base plates, L, N utmost point power end and load end plug are fixed on the loam cake medial surface, can close or draw back loam cake by rotating shaft; On cover the version difference of L, N two utmost points, the structure of the L utmost point is the fuse type on-load switch, respectively rivet a fusing base on L utmost point attaching plug and the load plug base plate, can insert the fusion tube of a corresponding specification, between two fusion tube seats the fusion tube blown fuse indicator is installed, at the fuse installed position red led cover is installed on the loam cake lateral surface; The structure of the N utmost point is a load-break switch, and the metallic conductor with no excess current protective function between N utmost point attaching plug and load plug is connected.The loam cake that closes, four plugs insert in four sockets, and power supply L is fuse output in loam cake, and power supply N is metallic conductor output in loam cake, draws back loam cake, and four plugs break away from sockets, and load L, N be effectively insulating power supply L, the N utmost points extremely all.

N utmost point attaching plug, N utmost point load plug and connection can be the apportion metalworks with no excess current protective function metallic conductor, also can be global copper products: at loam cake lateral surface upper end L utmost point side " L ", N utmost point side " N " printed words sign.

The utility model advantage: (1) because the interior N utmost point of on-load switch loam cake is cancelled fusion tube seat and blown fuse indicator, two plugs (17), (19) are a global copper product or difference metalwork with metallic conductor (18), so simple in structure, cost reduces; (2) on-load switch only L extremely on fusion tube of installing, operation consumes and reduces, the spare part expense reduces; (3) after the fusion tube fusing, the brightness of fusing indicator light is big, and indication obviously is convenient to people and is safeguarded use; (4) it is extremely clear and definite that on-load switch is distinguished L, N, not only L, N two-level structure difference in the loam cake, have only L utmost point side that the red led cover is arranged on the loam cake lateral surface, and clearly indicate " L ", " N " printed words in loam cake lateral surface upper end, provide convenience during this installs, overhauls, uses to people: accuracy of judgement; (5) during the distribution line overcurrent, the on-load switch L utmost point fusion tube that can only fuse disconnects phase line, guarantees people's safety, makes power distribution equipment meet " Code for design of low voltage power distribution installations and wiring systems ", " civil buildings electrical design standard " pertinent regulations fully.

Fig. 1. structural representation when opening according to the compound on-load switch loam cake that the utility model proposes.

Fig. 2. structural representation when closing according to the compound on-load switch loam cake that the utility model proposes.

Its structure: 1. base; 2. power supply N utmost point wiring hole; 3. power supply L utmost point wiring hole; 4. bakelite insulation cover cap; 5. the cover cap fixed screw insulate; 6. power supply N pole socket hole; 7. power supply L pole socket hole; 8. installing hole; 9. load L pole socket; 10. load L utmost point binding post; 11. load L utmost point plug; 12. load end L utmost point fusion tube seat; 13. bakelite insulation cover plate; 14. power end I utmost point fusion tube seat; 15. power supply L utmost point plug; 16. loam cake; 17. power supply N utmost point plug; Use metallic conductor 18. connect; 19, load N utmost point plug; 20. plug fixed screw; 21. load N utmost point binding post; 22. load N pole socket; 23. load N utmost point wiring hole; 24. load L utmost point wiring hole; 25. loam cake rotation axis; 26. fusing indicator-lamp cover.

Fig. 3. for the graphic symbol of Fig. 1, the corresponding compound on-load switch of Fig. 2.

Fig. 4. be fusion tube blown fuse indicator electrical schematic diagram.

Ne is a neon bulb, and starting voltage is less than 100V, and model is regardless of, and R is a RJ type 1/4W resistance, 1～2M Ω; XP1 is a power end L utmost point plug; XP2 is a load end L utmost point plug; FU is a fuse.

The utility model embodiment such as accompanying drawing 1, Fig. 2 and shown in Figure 4, its structure goes up cap assembly (comprising loam cake and each part mounted thereto) two parts by base assembly (comprising base and each part in addition mounted thereto) and forms.Base (1) and loam cake (16) are made by the high material of fire-retardant, good insulation preformance, mechanical strength such as urea-formaldehyde moulding powder etc.; Load socket (9), (22) be riveted on load wiring terminal (10) respectively, (21) on the base plate, supply socket is riveted on the supply terminals daughter backplane and (does not occur among the figure), four binding posts are fixed on the base (1) with screw respectively, bakelite insulation cover cap (4) is fixed on base (1) mains side with fixed screw (5), cover power end socket and binding post, after drawing back loam cake (16), the charged part of its power supply does not expose, improve safe coefficient, have two slots (6) on the cover cap (4), (7), when the loam cake that closes (16), loam cake (16) is gone up attaching plug (17), (15) respectively by hole (6), (7) insert in the supply socket in; Fusion tube seat (12), (14) be riveted on plug (11) respectively, (15) on the base plate, N utmost point plug (17), (19) connect with metallic conductor (18), plug (17), (19) and metallic conductor (18) can be the apportion metalwork, it also can be a global copper product, four plugs use fixed screw (20) to be fixed on the loam cake (16) respectively, under bakelite insulation cover plate (13), install blown fuse indicator (occurring among Fig. 1) between fusion tube seat (12) and (14), the blown fuse indicator electrical schematic diagram is as shown in Figure 4: neon bulb Ne be connected in parallel on fuse FU two ends after resistance R is connected, in the frame of broken lines is the blown fuse indicator circuit diagram, have a circular hole on loam cake (16) lateral surface, paste a red plastic sheet and make lampshade (26), when fusion tube fuses, neon bulb Ne is bright, and lampshade (26) is luminous; In loam cake (16) lateral surface upper end in L utmost point side with " L ", N utmost point side with " N " printed words sign; Can be easy to open or close by rotating shaft (25) loam cake, installing hole (8) is in order to the firm demand switch; Binding post and plug can adopt brass material, and fusion tube seat and socket can adopt copper based elastic material.

Claims

1. play connection in the uniline, disconnect compound on-load switch with overcurrent protection, form by base assembly and last cap assembly, the power end of switch L, the N utmost point and load termination line terminals are fixed on the base (1), L, N utmost point power end and four sockets of load end are riveted on four binding post base plates, L, N utmost point power end plug (15) (17) are fixed on loam cake (16) medial surface with load end plug (11) (19), can close or draw back loam cake (16) by rotating shaft (25); It is characterized in that the upward version difference of L, N two utmost points of loam cake (16), the structure of the L utmost point is the fuse type on-load switch, respectively rivet a fusion tube seat (14) and (12) on L utmost point attaching plug (15) and load plug (11) base plate, can insert the fusion tube of a corresponding specification, between two fusion tube seats (14), (12) the fusion tube blown fuse indicator is installed, at the fuse installed position red led cover (26) is installed on loam cake (16) lateral surface; The structure of the N utmost point is a load-break switch, and the metallic conductor (18) with no excess current protective function between N utmost point attaching plug (17) and load plug (19) is connected.

2. according to the described device of claim 1, it is characterized in that N utmost point attaching plug (17) is a global copper product with N utmost point load plug (19) with being connected with metallic conductor (18).

3. device according to claim 1, it is characterized in that N utmost point attaching plug (17), N utmost point load plug (19) and connecting with no excess current protective function metallic conductor (18) is the apportion metalwork.