CN104992872A - Safety electric power knife switch - Google Patents

Abstract

The invention provides a safety electric switch blade, which includes a base, a static contact seat, and a moving contact seat; the static contact seat has a circumferentially insulated and closed slideway, and its insulating side wall is provided with a The static contact on the same plane, the static contact divides the insulating side wall where it is located into two sections; the moving contact seat can move relative to the base, and within its range of motion, the moving contact on the moving contact seat can be inserted Pulled into the slideway; and the outer surface of the moving contact is completely attached to the inner wall of the slideway; the front section of the moving contact forms a front insulating section; the front insulating section is connected with a conductive section backward; the moving contact seat moves to the closing position , the conductive segment is completely attached to the static contact, and when it moves to the opening position, the conductive segment is completely separated from the static contact. The safety electric switch knife is not only convenient to operate, but also can effectively avoid the generation of electric arc in the process of closing and opening, and has high safety.

Description

Safety Power Switch Knife

technical field

The invention relates to the field of electric facilities, in particular to an electric switch blade.

Background technique

In the field of power facilities, the electric switch knife is a switch component that is very easy to operate and install, so it is widely used.

However, due to the large current on and off of the electric switch knife, when the distance between the static contact and the moving contact is small during the closing or opening process, arcs are easily generated; if the operation is not skilled, the The electric spark lasts for a long time, and may escape outside, thus causing a safety accident.

Contents of the invention

In view of the above problems, the object of the present invention is to provide a safe electric switch knife, which is not only easy to operate, but also can effectively avoid the generation of arc during closing and opening, and has high safety.

The technical solution adopted by the present invention to achieve the technical purpose is: the safety electric switch knife includes a base, and a static contact seat and a moving contact seat arranged on the base; the static contact seat has a circumferential insulating seal The slideway, the insulating side wall of the slideway is provided with a static contact in the same plane as the insulating sidewall, the length of the static contact is shorter than the slideway, and the static contact will The insulating side wall of the moving contact seat is divided into two sections; the moving contact seat can move relative to the base, and within the range of movement of the moving contact seat, the moving contact on the moving contact seat can be plugged into the slideway; And the outer surface of the moving contact is completely attached to the inner wall of the slideway; and the outer surface of the front section of the moving contact is insulated to form a front insulating section; the front insulating section is connected to a conductive section backward; the moving contact When the contact seat moves to the closing position, the conductive section is completely attached to the static contact; when the moving contact seat moves to the opening position, the conductive section is completely separated from the static contact.

Preferably, the outer surface of the rear section of the moving contact is also insulated to form a rear insulating section, and the conductive section is located between the front insulating section and the rear insulating section; and, when the moving contact is inserted into the slideway, When the conductive segment is in contact with the static contact, the rear insulating segment is submerged into the slideway.

Preferably, the static contact is arranged in a groove on the side wall of the slideway, and is supported by a support spring in the groove, so that the surface of the static contact is pressed against the surface of the movable contact.

Preferably, the moving contact seat is composed of a slider fitted on the base, and slides in a straight line in a linear slide groove on the base; the moving contact is connected to the base by a flexible wire The movable contact terminal is electrically connected; the static contact is electrically connected with the static contact terminal on the base.

Preferably, there are two moving contacts, which are electrically connected to the live wire and the neutral wire; the static contacts also have two, which are respectively electrically connected to the live wire and the neutral wire; and zero line for on-off.

Preferably, a cylinder is also fixed on the base, both ends of the cylinder are closed, and a check valve is provided at each end, and the flow direction of the check valve is from the inside of the cylinder to the outside of the cylinder; the cylinder There is a piston inside, and the piston rod connected to the piston passes through an end face of the cylinder and is connected to the moving contact seat, and the piston rod is airtightly matched with the end face of the cylinder; the side of the cylinder There is a vent hole on the wall, and the position of the vent hole satisfies the following conditions: when the contact area between the conductive segment and the static contact is 1/4~1/2 of the maximum electrical contact area, the vent hole is just Skimming the side wall of the piston and communicating with the cylinder cavity on one side of the piston.

The beneficial effect of the present invention is that: during the closing or opening process of the safety electric switch knife, during the relative movement between the moving contact and the static contact, they either directly contact or are isolated by the front insulating section, mutually There is always no air gap between them, thereby eliminating the generation of plasma, completely eliminating the conditions for the generation of arcs, and having good safety; and the operation is simple, basically the same as that of ordinary switch blades.

Description of drawings

Fig. 1 is a structural schematic diagram of Embodiment 1 of the safety electric switch knife in the state of opening.

Fig. 2 is a structural schematic diagram of Embodiment 1 of the safety electric switch knife in the closed state.

Fig. 3 is a schematic structural diagram of Embodiment 2 of the safety electric switch knife.

Fig. 4 is a schematic structural view of the cylinder in the second embodiment of the safety electric switch knife.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the present invention is further described:

In the first embodiment shown in Figures 1 and 2, the safety electric switch knife includes a base 1, and a static contact seat 2 and a moving contact seat 3 arranged on the base; the static contact seat 2 There is a circumferentially insulated and closed slideway 20, the insulating side wall of the slideway 20 is provided with a static contact 21 on the same plane as the insulating sidewall, and the length of the static contact 21 is shorter than that of the slideway. 20, and the static contact 21 divides the insulating side wall where it is located into two sections; in this embodiment, the static contact 21 is set in the groove 200 on the side wall of the slideway 20, and The supporting spring in the groove is supported, so that the surface of the static contact 21 is pressed against the surface of the movable contact 31 .

The moving contact seat 3 is composed of a slider fitted on the base 1, and slides along a straight line in a linear chute (not shown) on the base 1; the moving contact 31 is connected by a flexible wire It is electrically connected with the moving contact terminal 33 on the base 1 ; the static contact 21 is electrically connected with the static contact terminal 22 on the base 1 .

There is a push-pull part 32 on the moving contact seat 3, through pushing and pulling, the moving contact seat 3 can slide on the base 1, and the moving contact seat 3 is limited by the static contact seat 2 and the stop block 11 on the base within the sliding range of the movable contact seat 3, the movable contact 31 on the movable contact seat 3 can be plugged into the slideway 20; and the outer surface of the movable contact 31 is in contact with the The inner wall of the slideway 20 is fully fitted; and the outer surface of the front section of the moving contact 31 is insulated to form a front insulating section 311; the front insulating section 311 is connected with a conductive section 312 backward; the moving contact seat 3 moves to a closed position At the gate position, as shown in Figure 2, the conductive section 312 is completely attached to the static contact 21; when the moving contact seat 3 moves to the opening position, as shown in Figure 1, the conductive section 312 312 is completely separated from the static contact 21 . In the first embodiment, the conductive section 312 is also connected to the rear insulation 313 with an outer surface insulation. When the head 31 is inserted into the slide 20 and the conductive segment 312 is in contact with the static contact 21, the rear insulating segment 313 is submerged in the slideway, that is, when the conductive segment 312 is charged, the charged area has been covered by the rear The insulating section 313 is isolated so that even if the moving contact 31 is touched outside the slideway 20, there will be no electric shock.

In the first embodiment, there are two moving contacts 13, and there are two corresponding slideways 20 and two static contacts 21; each moving contact 31 is electrically connected to the live line and the neutral line; correspondingly, each static The contacts 21 are also electrically connected to the live wire and the neutral wire, so that the electric switch blade can simultaneously switch the live wire and the neutral wire.

During the closing or opening process of the above-mentioned safety electric switch knife, during the relative movement between the moving contact 31 and the static contact 21, they are either in direct contact, or are isolated by the front insulating section 311, and there is always no air between them. There is no gap, so as to prevent the generation of plasma and completely eliminate the conditions for the generation of arc, which has good safety; and the operation is simple, which is basically the same as that of ordinary switch blades.

Figure 3 shows the second embodiment of the safety electric switch knife, which is different from the first embodiment in that: a cylinder 4 is also fixed on the base 1, and both ends of the cylinder 4 are closed, and both ends are closed. A one-way valve 51,52 is provided at each end, and the flow direction of the one-way valve 51,52 is directed from the inside of the cylinder to the outside of the cylinder; a piston 6 is arranged in the cylinder, and the piston rod 61 connected to the piston 6 passes through the cylinder. Through an end surface of the cylinder 4, it is connected to the moving contact seat 3, and the piston rod 61 is airtightly matched with the end surface of the cylinder 4; a vent hole 40 is opened on the side wall of the cylinder 4, so that The position of the vent hole 40 satisfies the following condition: when the contact area between the conductive segment 312 and the static contact 21 is 1/4~1/2 of the maximum electrical contact area, the vent hole 40 just passes over the side of the piston 6 The wall communicates with the cylinder cavity on the side of the piston. Its outstanding advantages are analyzed as follows: it may be considered that in the process of opening the gate, the movable contact seat 3 is continuously pulled down, and the electrical contact area between the conductive section 312 and the static contact 21 is gradually reduced. Circulation, the pressure in the cylinder cavity on the upper side of the piston 6 is continuously reduced, and under the action of negative pressure, it is very difficult to pull down the contact seat 3, and as the movable contact 31 is pulled down, when the conductive segment 312 When the contact area with the static contact 21 is 1/4~1/2 of the maximum electrical contact area, the vent hole 40 suddenly communicates with the inner cavity of the cylinder on the upper side of the piston 6, resulting in a sudden pressure increase in the inner cavity of the cylinder on the upper side of the piston 6. rise, the negative pressure is suddenly released, so that the movable contact seat 3 is pulled down suddenly under the action of a large pulling force, so that the conductive section 312 of the movable contact is quickly separated from the static contact 21, and the contact area between the conductive section 312 and the static contact 21 is avoided. Stay in the area of 1/4~1/2 of the maximum electrical contact area for a long time to avoid rapid accumulation of heat on the electrical contact surface in this area, further improving safety.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (6)

1. a security power plug-in strip, comprises pedestal (1), and is located at fixed contact pedestal (2), the movable contact block (3) on pedestal; It is characterized in that: the slideway (20) in described fixed contact pedestal (2) with circumferential insulation and obturation, the insulative sidewall of described slideway (20) is provided with and is in isoplanar fixed contact (21) with this insulative sidewall, the length of described fixed contact (21) is less than described slideway (20), and the insulative sidewall at its place is divided into two sections by described fixed contact (21); Described movable contact block (3) can be movable relative to pedestal (1), and in the scope of activities of movable contact block (3), the moving contact (31) on movable contact block (3) is pluggable in described slideway (20); And the inwall of the outer surface of described moving contact (31) and described slideway (20) is fitted completely; And the insulation of the leading portion outer surface of moving contact (31), insulating segment (311) before being formed; Described front insulating segment (311) is connected with conductive segment (312) backward; When described movable contact block (3) moves to closing position, described conductive segment (312) and described fixed contact (21) are fitted completely; When described movable contact block (3) moves to and opens a sluice gate position, described conductive segment (312) is separated completely with described fixed contact (21).

2. security power plug-in strip according to claim 1, it is characterized in that: the back segment outer surface of described moving contact (31) also insulate, insulating segment (313) after being formed, described conductive segment (312) is between described front insulating segment (311), rear insulating segment (313); Further, insert in slideway (20), described conductive segment (312) is when contacting with fixed contact (21) at described moving contact (31), described rear insulating segment (313) is submerged described slideway (20).

3. security power plug-in strip according to claim 1 and 2, it is characterized in that: described fixed contact (21) is located in the groove (200) on the sidewall of described slideway (20), and supported by the support spring in groove, make the surface of fixed contact (21) be pressed in described moving contact (31) surface.

4. security power plug-in strip according to claim 1, is characterized in that: described movable contact block (3) is made up of the slide block be matched with on described pedestal (1), and linearly slides in straight on pedestal (1); Described moving contact (31) is electrically connected by the moving contact binding post (33) on flexible wire and described pedestal; Described fixed contact (21) is electrically connected with the fixed contact binding post (22) on described pedestal.

5. security power plug-in strip according to claim 1, is characterized in that: described moving contact (31) has two, is electrically connected live wire and zero line respectively; Described fixed contact (21) also has two, is electrically connected live wire and zero line respectively.

6. the security power plug-in strip according to claim 1 or 4, it is characterized in that: described pedestal (1) is also fixed with a cylinder (4), described cylinder two ends are all closed, and a unidirectional valve (51,52) is respectively established at two ends, and the circulating direction of described unidirectional valve is by pointing to outside cylinder in cylinder; Be provided with a piston (6) in described cylinder (4), the piston rod (61) that described piston connects, through an end face of cylinder, is connected to described movable contact block (3), and air-tight fit between the end face of described piston rod (61) and cylinder (4); The sidewall of described cylinder offers an air vent hole (40), the position of described air vent hole (40) meets following condition: when described conductive segment (312) is 1/4 ~ 1/2 of maximum area in electrical contact with the contact area of fixed contact (21), described air vent hole (40) just skims over piston side wall and is communicated with the cylinder inner cavity of piston side.