CN2221824Y

CN2221824Y - Four-electrode safety knife switch

Info

Publication number: CN2221824Y
Application number: CN 94244230
Authority: CN
Inventors: 许秀清
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-10-26
Filing date: 1994-10-26
Publication date: 1996-03-06
Anticipated expiration: 2004-10-26

Abstract

The utility model discloses a double-throw four-electrode safe knife switch which is suitable for the power supply switching of the industrial enterprises with duplicate power supplies. The utility model is characterized in that on the basis of the existing double-throw three-electrode knife switches, a neutral line (zero line) connecting seat is additionally arranged; thus, the purpose that the electricity using load matched with double power supplies can simultaneously cut off the phase line and the neutral line (zero line) of a power supply of a certain phase as the power supplies are switched can be realized, and the safe operation of the electricity using load can be ensured. The utility model has the advantages of simple structure and convenient use. The utility model is widely applied to the small-sized and the medium-sized enterprises and the power departments matched with double power supplies, and is an ideal and required safe knife switch device for the isolation of the terminals of electricity users.

Description

Double-throw four utmost point Safety knife switches

The utility model belongs to the low-tension supply knife switch, particularly a kind of double-throw four utmost point Safety knife switches that are applicable to the power supply switching of being furnished with duplicate supply industrial enterprise.

The knife switch that switches as the industrial enterprise power supply circuit of being furnished with duplicate supply generally is to adopt the double-throw triple-pole switch in the market.This double-throw triple-pole switch can only connect three phase lines of duplicate supply, and the neutral line (zero line) of the neutral line of this duplicate supply (zero line) and power load all is connected on the safety box in addition, therefore cause no matter plug-in strip is to be in cut-out, "on" position, this neutral line (zero line) all is in the connection operating state that can't cut off always.But the power supply of three-phase four-wire system has the neutral line (zero line), and the neutral line (zero line) is not in zero potential, so handing over (cutting) must cut off certain when changing power supply simultaneously to the phase line of power and the neutral line (zero line), with the safe operation of the electric loading of guaranteeing in the power load of being furnished with the duplicate supply device.Therefore double-throw three utmost point lock switches only are adapted to three-phase three-wire system living load specialized configuration switch, can not be used in the power load of being furnished with double-power supply loop and make the power supply of three-phase four-wire system and switch, otherwise cause electric shock, burn out electric equipment, cause serious consequence such as fire.

The purpose of this utility model provides a kind of double-throw four utmost point Safety knife switches that the neutral line (zero line) junction block (utmost point) is arranged.Be that a kind of power load that can be used to be furnished with the duplicate supply device is made the Safety knife switch that the power supply of three-phase four-wire system switches.

The technical solution of the utility model is: double-throw three utmost point lock switches that common upper, middle and lower junction block can only be connect three phase lines make the double-throw knife switch that the upper, middle and lower junction block can connect four lines (three-phase and four-line) into, just increased the junction block of a neutral line (zero line), we are called double-throw four utmost point knife switches.Thereby reach in the power load of being furnished with the duplicate supply device and can cut off certain purpose simultaneously during at Switching power to the phase line of power and the neutral line (zero line).To guarantee the safe operation of power load.

Accompanying drawing below in conjunction with embodiment further specifies the utility model

Vertical view (not being with protective cover) when Fig. 1 closes a floodgate for the utility model knife switch

Elevation cross-sectional view (not being with protective cover) when Fig. 2 closes a floodgate for the utility model knife switch

Fig. 3 is the appearance structure front view of the utility model knife switch

Fig. 4 is the appearance structure vertical view of the utility model knife switch

Fig. 5 is the structure chart of the contact knife 2 of the utility model knife switch

Fig. 6-1,6-2 are respectively the utility model knife switch, left view, the right view of upper and lower metal spring card (7,9).

Fig. 7-1,7-2 are respectively binding post (4,6) front view, the left view of the utility model knife switch.

Shown in Fig. 1,2,3,4, double-throw four utmost point knife switches of the present utility model are mainly by porcelain base 1, contact knife 2, porcelain tool holder 3, upper, middle and lower binding post (4,5,6), upper, middle and lower metal spring card (7,8,9), protection is moulded and is covered 10 and compositions such as corresponding screw, nut element.One end of contact knife 2 fixedly is riveted on the sheet metal 8 at porcelain base middle part by rivet 11, and can upper and lowerly in 0-170 ° freely rotate.It is characterized in that upper, middle and lower binding post (4,5,6) all respectively is four, four of contact knifes, corresponding upper, middle and lower metal spring cards (7,8,9) also respectively are four groups, just on former double-throw three utmost point lock switches, increase the junction block of a neutral line (zero line), promptly made to connect four lines (three-phase and four-line) double-throw knife switch into.Thereby reach in the power load of being furnished with the duplicate supply device and can cut off certain purpose simultaneously during at Switching power to the phase line of power and the neutral line (zero line).Therefore, double-throw four utmost point knife switches of the present utility model are applicable to that the power load of being furnished with double-power supply loop makes the power supply of three-phase four-wire system and switch, and are safe and convenient to use.

Double-throw four utmost point Safety knife switch functions of the present utility model are realized by the mode of connection, only need four leads separately of external duplicate supply three-phase and four-line are passed eight upper and lower lead-in wire slotted eyes (20,21) respectively, be attempted by on corresponding upper and lower eight binding posts (4,6); Four leads of the three-phase and four-line of power load pass lead-in wire slotted eye 22 in four respectively, also correspondingly are connected on four middle connecting terminals 5.When power load did not make electricity consumption, this moment, plug-in strip vertically was positioned on the position of " cut-out " power supply in the middle of the porcelain base 1, and contact knife 2 does not contact with any upper and lower metal spring card (7,9); When power load needed electricity consumption, a need pull to plug-in strip or following metal spring card (7,9) is clamped on the metal spring card contact knife 2, energized; When the need Switching power, only need that plug-in strip is pulled to another and on the metal spring card, just can.

In order to ensure the safe in utilization of knife switch and convenient, receive a mandate in order to improve the quality of products and to prolong to use.The utility model is pair of wire connection terminals also, and metal spring card, contact knife etc. have structurally been done a little improvement.

1, makes contact knife 2 into middle font (as shown in Figure 5) by common yi word pattern, promptly increase the contact-making surface that contacts 12 of contact knife 2 and metal spring card, and on contact-making surface 12, be provided with many little air vent holes of being convenient to dispel the heat 13, it is that diagonal cut joint angle, 45 ° of left and right sides is (as Fig. 6-1,6-2 that upper and lower metal spring card (7,9) changes bifurcation type α into by common bifurcation type horizontal line angular aperture, Fig. 2), just contact and become a line and contact when contact knife 2 and metal spring card engage moment like this by original single-point.Metal spring card (7,9) also is installed with the locking device that a spring 14 is used for the metal spring card in addition, causes sheet metal to unclamp not tight phenomenon to prevent to run jointly for a long time because of knife switch.Thereby overcome very easily heating after, the energising little, caused contact knife and spring card loose contact behind the expanded by heating and produce electric spark, be heated and be cast in the shortcoming that the interior insulating cement of fixing hole also can trickle out when serious because of contacting.

2, the inner face of the metal spring card 8 at the utility model porcelain base middle part dashes a semicircle ball-type projection 15 (as Fig. 2), an end of contact knife 2 have one with the corresponding breach 16 of projection (as Fig. 5), constitute the lock in place device thus.Therefore need disconnect two during when power load to power supply, blade of knife switch firmly vertically is positioned on the position of porcelain base middle " cut-out ", can not bump to certain to the power supply energized because of made plug-in strip swing by ambient vibration, generation should not take place uses electrification.

3, the upper and lower binding post of the utility model (4,6) is to adopt type groove 17, also a slice will be arranged in type groove

The metal sheeting 18 of type (as Fig. 7-1,7-2), and by screwing screw 19 roof pressures on this groove

Type metal sheeting 18 is through in the type groove thereby compress

Lead under the type sheet metal 18.This binding post wiring compactness, the amount of damming is big, electrical efficiency is high.Because screw does not have directly with lead and contacts, the high temperature of having avoided producing because of lead and binding post is with screw and terminal sintering possibility together.

4, the utility model protection is moulded and cover 10 and be designed to semi-circular totally enclosed type, and plug-in strip can pushing arbitrarily up and down in 0-170 °, operating personnel not can because of because of carelessness and contact knife touch, and produce dangerous electric shock phenomenon, guaranteed life safety.

No matter the utility model is the lead-in wire outlet of input lead or output lead in addition, all adopt upper, middle and lower on porcelain base 1 to open the mode of the lead-in wire slotted eye that crosses, input lead slotted eye (20,21), output lead slotted eye 22 (as shown in Figure 1), changed output line lead-in wire outlet in the past unreasonable from the lead-in wire cabling that the porcelain base plate passes, use inconvenient, inaesthetic bad phenomenon.

The upper and lower symmetry of the utility model structure, simple, easily manufactured, low price, safe and convenient to use, good, the length of receiving a mandate of quality is that medium-sized and small enterprises are furnished with must being equipped with of double-power supply loop and put, and also is the desirable safety switching apparatus that electricity consumer terminal that power department is promoted is isolated.

Claims

1, a kind of double-throw four utmost point Safety knife switches, mainly by porcelain base 1, contact knife 2, porcelain tool holder 3, on, in, lower connecting terminal (4,5,6), on, in, following metal spring card (7,8,9), protection is moulded and is covered 10 and corresponding screw, compositions such as nut securing member, one end of contact knife 2 fixedly is riveted on the sheet metal 8 at porcelain base middle part, and on can be in 0-170 °, freely rotate down, it is characterized in that, in, lower connecting terminal (4,5,6) all respectively be four, 2 four of contact knifes, accordingly (on, in, metal spring card (7 down), 8,9) also respectively be four groups, just increased the junction block of a neutral line (zero line) on former double-throw three-pole knife switch, i.e. change connects three phase lines for connecing the junction block of four lines (three-phase and four-line).

2, double-throw four utmost point Safety knife switches according to claim 1, it is characterized in that contact knife 2 is middle font, and on middle font contact knife 2, be provided with many little air vent holes 13 of being convenient to dispel the heat, upper and lower metal spring card (7,9) bifurcation type angular aperture α is 45 ° of diagonal cut joint angles, also is installed with spring 14 locking devices in addition on upper and lower metal spring card (7,9).

3, double-throw four utmost point Safety knife switches according to claim 1 and 2, the inner face that it is characterized in that spring card 8 is towards having a semi-circular projection 15, an end of contact knife 2 to have one and the corresponding breach 16 of projection.

4, double-throw four utmost point Safety knife switches according to claim 1 and 2 is characterized in that upper and lower binding post (4,6) is to adopt type groove 17, also is equipped with a slice in type groove

The metal sheeting 18 of type is by screwing screw 19 roof pressures on this type groove

Type metal sheeting 18 is through in the type groove thereby compress

Lead under the type sheet metal 18.

5, double-throw four utmost point Safety knife switches according to claim 3 is characterized in that upper and lower binding post (4,6) is to adopt type groove 17, also is equipped with a slice in type groove

The metal sheeting 18 of type is by screwing screw 19 roof pressures on this type groove Type metal sheeting 18 is through in the type groove thereby compress

Lead under the type sheet metal 18.