CN213025849U - Contact system of circuit breaker and switch - Google Patents

Abstract

The utility model discloses a contact system that can be used to circuit breaker and switch, including erectting the direction muscle that sets up on the base, divide and arrange in the compression spring and the static contact of the direction muscle left and right sides, setting are in the conducting strip of the top of compression spring and static contact, the middle part of conducting strip is connected with crank link mechanism, crank link mechanism include the connecting rod with as articulate knob, the one end of connecting rod pass through the upper shaft with the knob rotates to be connected, the other end of connecting rod is rotated with the conducting strip through the lower shaft and is connected, and the epaxial overcoat of lower shaft has one to mould the guide pin bushing, just it pastes to lean on in the side of direction muscle and can follow to mould the guide pin bushing the side vertical friction motion of direction muscle lie in on the conducting strip the one end of static contact top is provided with the moving contact. The utility model discloses a moving contact and static contact process are to in time cleaing away of electric arc filth on the contact face to contact resistance has been reduced, the contact temperature rise has been reduced.

Description

Contact system of circuit breaker and switch

Technical Field

The utility model relates to a contact system of moving contact and static contact, especially a contact system that can be used to circuit breaker and switch.

Background

The circuit breaker and the switch have the functions of switching on and off the circuit. At present, a circuit breaker and a switch moving contact system in a link mechanism form generally comprise a conducting strip, a moving contact, a static strip and a static contact, wherein the conducting strip and the moving contact are connected together by riveting or welding, and the moving contact on the conducting strip is closed and disconnected with the static contact, so that a circuit is switched on (switched on) and switched off (switched off). When the circuit of the breaker or the switch is switched on, the current flows from the conducting strip to the moving contact and the static contact to the static piece. The size of the internal space of the circuit breaker or the switch limits the size of the conducting strip and also limits the size of the opening distance between the movable contact and the fixed contact.

The circuit breaker and the switch in the prior art have the following defects:

firstly, when a circuit breaker or a switch is disconnected between two contacts, namely when a loop is opened, an electric arc can occur between a moving contact and a static contact, and the electric arc can bring the migration of contact substances to the contacts, so that the change of the organization components, physical and chemical properties of the contacts is caused, and particularly, an oxide film (insulating film) is formed on the surfaces of the contacts, so that the contact resistance is increased. Generally, each time the moving contact and the static contact are broken, the contact resistance is increased by a plurality of times or even tens of times.

And secondly, joule heat generated by current passing through the contact resistor is a main cause of heating of the contact, and the heating of the contact can cause overall heating of the product and even a series of accidents such as ignition and the like.

Therefore, in order to reduce the temperature rise of the contact, keeping the surface of the contact clean (reducing an oxide layer) is an effective technology for improving the reliability of products in circuit breakers or switch products.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a contact system of circuit breaker and switch aims at realizing moving contact and the timely cleaing away of static contact process electric arc filth on to the contact face to reduce contact resistance, reduce the contact temperature rise. The specific technical scheme is as follows:

a contact system of a circuit breaker and a switch comprises a guide rib vertically arranged on a base, a compression spring and a static contact which are respectively arranged on the left side and the right side of the guide rib, and a conducting strip arranged above the compression spring and the static contact, wherein the middle part of the conducting strip is connected with a crank-link mechanism, the crank-link mechanism comprises a connecting rod and a knob used as a crank, one end of the connecting rod is rotatably connected with the knob through an upper shaft, the other end of the connecting rod is rotatably connected with the conducting strip through a lower shaft, a plastic guide sleeve is sleeved outside the lower shaft and clings to the side surface of the guide rib and can move along the side surface of the guide rib in a vertical friction mode, a moving contact is arranged at one end, located above the static contact, of the conducting strip, and the compression spring upwards supports the conducting strip.

Preferably, the base is provided with a limiting rib, the limiting rib is provided with a limiting hole, and one end of the conducting strip, which is far away from the moving contact, movably penetrates into the limiting hole to form pre-compression support of the compression spring on the conducting strip.

Preferably, the knob is rotatably arranged on the knob shaft and is connected with a knob spring for resetting.

Preferably, the side surface of the guide rib is one of a vertical surface, an inclined surface and an arc surface.

The side surface of the guide rib adopts a vertical surface, an inclined surface or a cambered surface, so that the sliding and rolling range of the moving contact along the left-right direction can be controlled.

In the utility model, the contact system realizes the disconnection and the closing of the moving contact and the static contact through the crank link mechanism; when the moving contact and the static contact are in a disconnected state, an upper shaft connected with the knob is positioned at the fourth quadrant position of the knob; when the moving contact and the static contact are switched from the off state to the on state, the upper shaft connected with the knob moves to the third quadrant position of the knob.

Preferably, the fixed contact is fixed on the fixed sheet.

Wherein the stator is fixedly arranged relative to the base.

Preferably, an upward bending part is arranged at one end of the conductive sheet far away from the movable contact, and a gap is arranged between the bending part and the guide rib.

The utility model discloses in, make during the knob rotation the moving contact with the static contact experiences following four stages from the disconnection to the closure:

(1) the moving contact moves downwards: the lower shaft rubs downwards along the side surface of the guide rib to drive the moving contact on the conducting strip to move downwards and enable the cambered surface of the moving contact to form initial contact with the cambered surface of the static contact, the conducting strip moves to a state that the right side of the conducting strip is inclined downwards, and at the moment, the upper shaft connected with the knob is positioned in the fourth quadrant of the knob;

(2) the moving contact slides and rolls rightwards: the lower shaft continuously rubs and moves downwards along the side face of the guide rib to drive the conducting plate to apply pressure downwards to the compression spring, the downward inclined angle of the right side of the conducting plate is gradually reduced until the conducting plate moves to a horizontal state, the movement of the conducting plate drives the cambered surface of the moving contact to slide rightwards relative to the cambered surface of the static contact and simultaneously roll anticlockwise along the cambered surface of the static contact, and at the moment, the upper shaft connected with the knob is still in the fourth quadrant of the knob;

(3) the moving contact slides and rolls leftwards: the lower shaft continuously rubs and moves downwards along the side face of the guide rib to drive the conducting strip to further press the compression spring downwards, the conducting strip moves from a state that the right side is inclined downwards to a state that the left side is inclined downwards, the moving of the conducting strip drives the cambered surface of the moving contact to slide leftwards relative to the cambered surface of the static contact and simultaneously roll anticlockwise along the cambered surface of the static contact, and at the moment, the upper shaft connected with the knob moves to the junction of the fourth quadrant and the third quadrant of the knob;

(4) the moving contact slides and rolls in a rightward return mode: the lower shaft moves upwards along the side face of the guide rib in a friction mode to drive the conducting plate to loosen the pressure applied to the compression spring, the downward inclined angle of the left side of the conducting plate is gradually reduced until the conducting plate moves to the horizontal state, the moving of the conducting plate drives the cambered surface of the moving contact to reset and slide rightwards relative to the cambered surface of the static contact and simultaneously roll clockwise along the cambered surface of the static contact, and at the moment, the upper shaft connected with the knob moves from the fourth quadrant to the third quadrant of the knob to form the complete closing state of the circuit breaker or the switch.

The sliding and rolling ranges of the moving contact relative to the static contact can be realized by adjusting the shape of the arc surface of the side surface of the guide rib.

The utility model has the advantages that:

first, the utility model discloses a contact system of circuit breaker and switch through setting up crank link mechanism, can be so that connect the guide pin bushing of moulding of guide vane along the side of direction muscle friction motion from top to bottom, realized the roll and the slip of the static contact in-process on the moving contact of guide vane and the stator, can clear away because pollutants such as electric arc filth, dirt ash and oxide layer that the floodgate that opens and shuts produced on the contact face from this, reduce contact resistance, reduce the contact temperature rise.

Second, the utility model discloses a contact system of circuit breaker and switch, moving contact and static contact follow disconnection to four stages below the closed experience when knob rotates, including moving contact and static contact initial stage contact, the moving contact slides and rolls right, the moving contact slides left and rolls and the moving contact returns right and slides and roll, has improved the ability of cleaing away electric arc filth on moving contact cambered surface and the static contact cambered surface from this comprehensively, the electric switching life-span of dirt ash and oxide layer etc. pollutant, has further improved the electric switching life-span of product from this to the reliability and the security of contact work have further been improved.

Third, the utility model discloses a contact system of circuit breaker and switch, the moving contact slides and the rolling scope can realize through the different shapes that set up the direction muscle side to ensure clearing away comprehensively of electric arc filth around the contact, improve the stability of contact.

Fourth, the utility model discloses a contact system of circuit breaker and switch, because the mechanism of adoption is simple, spare part is few, consequently has little volume, advantage with low costs.

Drawings

Fig. 1 is a schematic structural diagram of a contact system of a circuit breaker and a switch according to the present invention (the contact and the stationary contact are in a disconnected state);

fig. 2 is a schematic view of a contact system and a mechanism state of a moving contact and a fixed contact in an initial contact state;

FIG. 3 is a schematic diagram of the frictional movement of the plastic guide sleeve on the side of the guide rib;

FIG. 4 is a schematic diagram of the state of the contact system and mechanism when the moving contact and the static contact reach the maximum pressure;

fig. 5 is a schematic diagram of the contact system and the mechanism state after closing (the contact and the fixed contact are in a fully closed state);

fig. 6 is a schematic diagram of the change of the contact point in the whole process from the gradual contact of the moving contact with the fixed contact to the complete closing.

In the figure: 1. the device comprises a base 2, a compression spring 3, a guide rib 4, a plastic guide sleeve 5, a lower shaft 6, a static sheet 7, a static contact 8, a moving contact 9, a conducting sheet 10, a connecting rod 11, an upper shaft 12, a knob 13, a knob spring 14, a knob shaft 15 and a limit rib;

in the figure: 3a, the side surface of the guide rib, 7a, the intersection point of the moving contact and the static contact, 7b, the intersection point of the moving contact and the static contact, 7c, the intersection point of the moving contact and the static contact, and 9a, the intersection point of the compression spring and the conducting strip.

Detailed Description

The following description will further describe embodiments of the present invention with reference to the accompanying drawings and examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

Fig. 1 to 6 show an embodiment of a contact system of a circuit breaker and a switch according to the present invention, which includes a guiding rib 3 vertically disposed on a base 1, a compression spring 2 and a static contact 7 separately disposed on the left and right sides of the guiding rib 3, and a conductive plate 9 disposed above the compression spring 2 and the static contact 7, wherein the middle portion of the conductive plate 9 is connected to a crank link mechanism, the crank link mechanism includes a connecting rod 10 and a knob 12 as a crank, one end of the connecting rod 10 is rotatably connected to the knob 12 through an upper shaft 11, the other end of the connecting rod 10 is rotatably connected to the conductive plate 9 through a lower shaft 5, a plastic guide sleeve 4 is sleeved on the lower shaft 5, the plastic guide sleeve 4 is attached to the side surface of the guiding rib 3 and can move up and down along the side surface of the guiding rib 3, a movable contact 8 is disposed at one end of the fixed contact 9 above the static contact 7, the compression spring 2 holds the conductive plate 9 upward.

Preferably, a limiting rib 15 is arranged on the base 1, a limiting hole is arranged on the limiting rib 15, and one end of the conducting strip 9, which is far away from the moving contact 8, movably penetrates into the limiting hole to form pre-compression support of the compression spring 13 to the conducting strip 9.

Preferably, the knob 12 is rotatably provided on a knob shaft 14 and is connected to a knob spring 13 for return.

Preferably, the side surface of the guide rib 3 is one of a vertical surface, an inclined surface and an arc surface.

The side surface of the guide rib 3 adopts a vertical surface, an inclined surface or a cambered surface, and the sliding and rolling range of the moving contact 8 along the left-right direction can be controlled.

In this embodiment, the contact system realizes the disconnection and the connection between the moving contact 8 and the fixed contact 7 through the crank link mechanism; when the moving contact 8 and the static contact 7 are in a disconnected state, the upper shaft 11 connected with the knob 12 is in a fourth quadrant position of the knob 12; when the moving contact 8 and the static contact 7 are switched from the open state to the closed state, the upper shaft 11 connected with the knob 12 moves to the third quadrant position of the knob 12.

Preferably, the stationary contact 7 is fixed on the stationary blade 6.

Wherein the stator 6 is fixedly arranged relative to the base 1.

Preferably, an upward bent portion is provided at an end of the conductive sheet 9 away from the movable contact 8, and a gap is provided between the bent portion and the guide rib 3.

In this embodiment, when the knob 12 rotates, the moving contact 8 and the stationary contact 7 go through the following four stages from opening to closing:

(1) the moving contact 8 moves downwards: the lower shaft 5 rubs and moves downwards along the side surface of the guide rib 3 to drive the moving contact 8 on the conducting strip 9 to move downwards and enable the arc surface of the moving contact 8 to form initial contact with the arc surface of the static contact 7, at this time, the conducting strip 9 moves to a state that the right side is inclined downwards, and the upper shaft 11 connected with the knob 12 is positioned in the fourth quadrant of the knob 12; [ refer specifically to (1) in FIGS. 1 and 6 ]

(2) The moving contact 8 slides and rolls rightwards: the lower shaft 5 continuously rubs downwards along the side surface of the guide rib 3 to drive the conducting strip 9 to press the compression spring 2 downwards, and the downward inclination angle of the right side of the conducting strip 9 is gradually reduced until the conducting strip 9 moves to a horizontal state, the movement of the conducting strip 9 drives the arc surface of the moving contact 8 to slide rightwards relative to the arc surface of the static contact 7 and simultaneously roll anticlockwise along the arc surface of the static contact 7, and at this time, the upper shaft 11 connected with the knob 12 is still in the fourth quadrant of the knob 12; [ refer specifically to (2) in FIGS. 2 and 6 ]

(3) The moving contact 8 slides and rolls to the left: the lower shaft 5 continuously rubs downwards along the side surface of the guide rib 3 to drive the conducting strip 9 to further press the compression spring 2 downwards, and the conducting strip 9 moves from a right side downward inclined state to a left side downward inclined state, the movement of the conducting strip 9 drives the arc surface of the moving contact 8 to slide leftwards relative to the arc surface of the static contact 7 and simultaneously roll anticlockwise along the arc surface of the static contact 7, and at this time, the upper shaft 11 connected with the knob 12 moves to the junction of the fourth quadrant and the third quadrant of the knob 12; [ refer specifically to (3) in FIGS. 4 and 6 ]

(4) The moving contact 8 regresses to slide and roll rightwards: the lower shaft 5 moves upwards along the side surface of the guide rib 3 in a friction mode, the conductive sheet 9 is driven to loosen the pressure applied to the compression spring 2, the downward inclination angle of the left side of the conductive sheet 9 is gradually reduced until the conductive sheet 9 moves to the horizontal state, the movement of the conductive sheet 9 drives the cambered surface of the movable contact 8 to rightwards reset and slide relative to the cambered surface of the static contact 7 and simultaneously clockwise roll along the cambered surface of the static contact 7, and the upper shaft 11 connected with the knob 12 moves from the fourth quadrant to the third quadrant of the knob 12 at the moment to form the complete closing state of the circuit breaker or the switch. [ refer specifically to (4) in FIGS. 5 and 6 ]

The sliding and rolling ranges of the moving contact 8 relative to the fixed contact 7 can be realized by adjusting the shape of the arc surface of the side surface of the guide rib 3.

The following is a further supplementary description of the contact process of the movable contact 8 with respect to the stationary contact 7 with reference to the accompanying drawings:

as shown in fig. 3, the guide rib 3 is provided with a side surface 3 a. When the lower shaft 5 moves up and down, the plastic guide sleeve 4 is driven to move along the side surface 3a of the guide rib in a friction way.

As shown in fig. 1, the lower shaft 5 is pushed or pulled to move during the movement of the connecting rod 10 and the conducting strip 9 is driven to move. In the movement of the conductive sheet 9, before the movable contact 8 and the fixed contact 7 on the conductive sheet 9 contact, the movement of the conductive sheet 9 will rotate with the intersection point 9a of the compression spring 2 and the conductive sheet 9 as a fulcrum and with the distance from the movable contact 8 to the intersection point 9a as a radius.

As shown in fig. 2, when the movable contact 8 contacts the stationary contact 7, the conductive sheet 9 does not rotate around the intersection 9a as a rotation center, but rotates around the lower shaft 5 and around the lower shaft 5 to the movable contact 8 as a radius, and the lower shaft 5 presses the conductive sheet 9 downward due to the downward pressure of the connecting rod 10. The rotation of the conducting strip 9 around the lower shaft 5 makes the moving contact 8 at the end of the conducting strip 9 perform rolling friction motion on the surface of the fixed contact 7.

As shown in fig. 3, the plastic guide sleeve 4 makes a friction motion downward along the side surface 3a of the guide rib, and the contact pressure between the plastic guide sleeve 4 and the guide rib makes the movable contact 8 perform a sliding friction motion on the surface of the stationary contact 7 in addition to the rolling friction motion.

As shown in fig. 4, when the connecting rod 10 pushes the lower shaft 5 down to the lowest end, which is called the dead point position of the lower shaft 5, the intersection point of the movable contact 8 and the fixed contact 7 is at point 7b, and the maximum pressure contact between the two contacts is achieved.

As shown in fig. 5, when the knob 12 continues to rotate to the stop position, the lower shaft 5 is driven by the connecting rod 10 to move the conducting strip 9 upwards and rotate, the movement is the complete closing of the contact, and the intersection point of the moving contact 8 and the static contact 7 is at the point 7c, that is, the circuit breaker or the switch is completely closed.

As shown in fig. 6, the above series of movements stops when the intersection point 7a is reached from the contact of the movable contact 8 with the fixed contact 7, and then the intersection point reaches the position 7b by sliding and rolling, and finally reaches the point 7 c. The series of movements reach the aim of generating sliding and rolling between the moving contact and the fixed contact which is required by people.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims (7)

1. A contact system of a circuit breaker and a switch is characterized by comprising a guide rib vertically arranged on a base, a compression spring and a fixed contact which are respectively arranged on the left side and the right side of the guide rib, and a conductive sheet arranged above the compression spring and the fixed contact, wherein the middle part of the conductive sheet is connected with a crank-link mechanism, the crank-link mechanism comprises a connecting rod and a knob used as a crank, one end of the connecting rod is rotatably connected with the knob through an upper shaft, the other end of the connecting rod is rotatably connected with the conductive sheet through a lower shaft, a plastic guide sleeve is sleeved on the lower shaft, the plastic guide sleeve is attached to the side surface of the guide rib and can move up and down along the side surface of the guide rib in a friction mode, a moving contact is arranged at one end, located above the fixed contact, of the conductive sheet, and the compression spring upwards.

2. The contact system of claim 1, wherein the base has a limiting rib, the limiting rib has a limiting hole, and an end of the conductive plate away from the movable contact movably penetrates into the limiting hole to form a pre-compression support of the compression spring to the conductive plate.

3. The contact system of circuit breaker and switch as claimed in claim 1, wherein the knob is rotatably disposed on the knob shaft and connected to a knob spring for resetting.

4. The contact system of claim 1, wherein the guiding rib has one of a vertical surface, an inclined surface and an arc surface.

5. The contact system of circuit breaker and switch as claimed in claim 1, wherein the contact system is configured to open and close the moving contact and the stationary contact via the crank-link mechanism; when the moving contact and the static contact are in a disconnected state, an upper shaft connected with the knob is positioned at the fourth quadrant position of the knob; when the moving contact and the static contact are switched from the off state to the on state, the upper shaft connected with the knob moves to the third quadrant position of the knob.

6. The contact system of claim 1, wherein the stationary contact is fixed to the stationary plate.

7. The contact system of claim 1, wherein an upward bent portion is disposed at an end of the conductive sheet away from the movable contact, and a gap is disposed between the bent portion and the guiding rib.

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