CN202549740U - Contactor with switching mechanism - Google Patents

Abstract

The utility model discloses a current contactor with an opening and closing mechanism, which comprises: a static contact, which is fixedly arranged on the contactor shell; movement between the closed and open positions of the contacts; a moving iron core configured to move between the engaged position and the open position; and the movement of the moving iron core in response to the engaged position and the open position An opening and closing mechanism that moves movable contacts between closed and open positions. The opening and closing mechanism includes a link mechanism and a tripping mechanism. The tripping mechanism includes a lock and a trip bar locked by the lock. The link mechanism includes a first connecting rod and a second connecting rod. The first connecting rod of the first connecting rod end is pivotally connected to the moving contact bracket, the first end of the second link is pivotally connected to the second end of the first link and the second end of the second link is pivotally connected to the trip lever, and the trip mechanism Cooperates with the linkage mechanism to hold the moving contact in the closed position.

Description

Current contactor with opening and closing mechanism

technical field

The utility model relates to a current contactor, in particular to a low power consumption current contactor with an opening and closing mechanism. the

Background technique

The contactor is a widely used industrial control electrical appliance, which belongs to the category of low-voltage electrical appliances. With the deepening of the country's efforts in energy conservation and environmental protection, its energy consumption level has received more and more attention from government departments. In recent years, my country has promulgated the relevant national standard GB 21518-2008 "Minimum allowable values of energy efficiency and energy efficiency grades for AC contactors (Minimum allowable values of energy efficiency and energy efficiency grades for AC contactors)". The energy efficiency level is divided into 5 levels, the smaller the level value, the higher the level, and the higher the energy efficiency. Therefore, level 1 is a low energy consumption product, and is encouraged to develop and produce. Level 5 is a product with high energy consumption, which is restricted and eliminated. Research and development of products with low energy consumption is in line with China's 12th Five-Year Plan, and will be recognized by the government, thus having a larger market. the

At present, current contactors all adopt the method of direct electromagnet pull-in to keep the contactor closed. That is, the electromagnet needs to overcome the reaction force of the "breaking spring" and the contact pressure to keep the contacts of the contactor closed. Since the contact pressure necessary for contact closure and the reaction force of the breaking spring are large, the electromagnet is required to have sufficient energy to maintain this attraction. The energy consumption of the electromagnet required to keep the contacts closed is the main component of the energy consumption of the contactor. It can be seen that the energy consumption of the contactor is positively related to the sum of the reaction force of its breaking spring and the contact pressure, and the value is very large. It is for this reason that the energy consumption of existing products is relatively large, and some specifications of products do not have energy efficiency grade 1. the

There are mainly two types of current contactors in the prior art:

Figure 1 shows a simplified schematic diagram of the first type of contactor. As shown in Figure 1, when the electromagnet coil is turned on, the moving contact 2 is quickly closed with the static contact 1 of the client terminal 10 under the pull of the moving iron core 3 via the lever 9 and overcomes the contact pressure (not shown ) and the reaction force of the breaking spring (not shown), and is kept in the closed position; when the solenoid coil is disconnected, the moving contact 2 quickly reaches the breaking position under the double action of the breaking spring and the contact spring. open position. Due to the start of the closing of the driving contacts, the air gap of the electromagnet is very large, and a large current is required to realize this driving, and when the contacts are closed, the current of the electromagnet coil remains in this large state, so this kind of Contactors consume a lot of energy. the

A second type of contactor is provided with a primary coil and a secondary coil. When the user connects the control circuit, the built-in electronic circuit board supplies power to the main coil of the electromagnet to realize the rapid closing of the contacts. After tens of milliseconds (the contactor is closed at this time), the circuit board stops supplying power to the main coil and turns to supply power to the auxiliary coil. At this time, the minimum energy required by the electromagnet is the sum of the reaction force of the breaking spring and the contact pressure, so the energy consumption of this contactor is relatively high. In addition, due to the existence of electronic circuit boards, this type of product also has the defect of having higher requirements on the quality of grid voltage and electromagnetic interference. the

Therefore, the current contactor in the prior art has the problem of high energy consumption, and the second type of current contactor is easily affected by line voltage and electromagnetic interference, and has poor reliability. the

Utility model content

The utility model is made in view of the above-mentioned problems in the prior art, and the purpose of the utility model is to provide a current contactor with low energy consumption. The utility model mainly realizes the low energy consumption of the current contactor by changing the method of keeping the contacts of the current contactor closed, that is, changing the method of keeping the contacts closed by the traditional electromagnet into mechanically keeping the contacts closed. Because the energy consumption level of the utility model is much lower than that of the existing products, it will be able to effectively improve the standard of the existing energy efficiency level, and make the products with the technology more competitive. the

The utility model provides a contactor used in a current (AC or DC) contactor, which can not only keep the contact closed by switching to a smaller current immediately after the contact is closed, but also can completely cut off the power of the electromagnet. The opening and closing mechanism that allows the contacts to open quickly under certain conditions, thereby providing a low-power contactor. the

The purpose of this utility model is achieved by providing a current contactor, which includes: a static contact, which is fixedly arranged on the housing of the current contactor; a moving contact, which The contact is arranged to be movable between the closed and separated positions with the fixed contact; the moving iron core is arranged to be movable between its suction position and the separated position; and the opening and closing mechanism, The opening and closing mechanism responds to the movement of the moving iron core between the suction position and the separation position so that the movable contact moves between the closing position and the separation position, and the opening and closing mechanism includes a link mechanism and A trip mechanism, the trip mechanism includes a lock and a trip lever, the trip lever can be locked by the lock, the linkage mechanism includes a first link and a second link, and the first link The first end of the rod is pivotally connected to the movable contact bracket on which the movable contact is arranged, the first end of the second link is pivotally connected to the second end of the first link, and the second A second end of the link is pivotally connected to the trip lever, and the trip mechanism cooperates with the link mechanism to maintain the movable contact in the closed position. the

In a preferred embodiment of the present utility model, the trip lever has a first end pivotably arranged on the housing of the contactor and a second end lockable by the latch. the

In a preferred embodiment of the present utility model, the lock catch is pivotally arranged on the housing of the contactor, so as to lock the second end of the trip lever at the locked position and release the The second end of the trip lever rotates between the unlocked positions. the

In a preferred embodiment of the present invention, in response to the moving iron core moving between the engaging position and the disengaging position, the lock catch rotates between the locking position and the unlocking position . the

In a preferred embodiment of the present utility model, the moving iron core is provided with a push rod, and the push rod pushes the lock catch to rotate between the locking position and the unlocking position. the

In a preferred embodiment of the present utility model, the trip lever is pivotally connected to the link mechanism, so as to keep the movable contact at the closed position by means of the link mechanism. the

In a preferred embodiment of the present invention, the electric contactor further includes a breaker arranged between the housing of the electric contactor and the movable contact for driving the breaking action of the movable contact. A spring and a return spring arranged between the housing of the current contactor and the moving iron core are used to reset the moving iron core. the

In a preferred embodiment of the present utility model, the contactor further includes a main coil and an auxiliary coil for driving the moving iron core to move, and the main coil is powered to make the moving iron core overcome the The reaction force of the break spring and the return spring moves from the separation position to the suction position; the auxiliary coil is powered to make the moving iron core overcome the reaction force of the return spring and remain in the suction position. fit position. the

In a preferred embodiment of the present invention, the contactor further includes a micro switch, and the micro switch is driven by any one of the linkage mechanism, the tripping mechanism and the moving iron core , switching between supplying power to the primary coil and supplying power to the secondary coil. the

With the current contactor of the present utility model, since the moving iron core only needs to overcome the reaction force of its own return spring in the closed position of the moving contact, the energy required by the moving iron core is reduced, thereby reducing the energy consumption of the entire current contactor. energy needed. the

Description of drawings

Other purposes of the present utility model, feature and industry and technical importance will become easier to understand by the following detailed description of the specific embodiment of the present utility model in conjunction with accompanying drawing, in the figure:

Fig. 1 is a schematic diagram of the action principle of an embodiment of a current contactor according to the prior art;

2A to 2D are schematic diagrams showing the action principle of an embodiment of a current contactor with an opening and closing mechanism according to the present invention. FIG. 2A is a view showing the state before the moving contact and the static contact are closed, and FIG. 2B is The view showing that the moving contact and the static contact are in the closed state, and the opening and closing mechanism is in the holding state, Fig. 2C is a view showing that the moving contact and the static contact are in the closed state, and the opening and closing mechanism is in the tripping state, Fig. 2D is a view showing that the moving contact is separated from the static contact; and

Fig. 3 is a schematic structural diagram of an embodiment of a current contactor with an opening and closing mechanism according to the present invention. the

Detailed ways

Preferred embodiments of the present utility model are described in detail below with reference to the accompanying drawings. the

2A to 2D are schematic diagrams of the action principle of a preferred embodiment of a current contactor with an opening and closing mechanism according to the present invention, wherein FIG. 2A is a view showing that the moving contact and the static contact are separated, and FIG. 2B is a view showing The moving contact and the static contact are in a closed state, and the opening and closing mechanism is in a holding state. Figure 2C is a view showing that the moving contact and the static contact are in a closed state, but the opening and closing mechanism is in a tripped state. Figure 2D is It shows the view that the moving contact is separated from the static contact. And FIG. 3 is a schematic structural diagram of an embodiment of a current contactor with an opening and closing mechanism according to the present invention. the

As shown in Figure 3, the opening and closing mechanism according to the utility model is composed of a link mechanism and a tripping mechanism, and the link mechanism is two groups symmetrically distributed with respect to the movable contact bracket 13, but the utility model is not limited to this. For the sake of brevity, the utility model will be described below only by taking one group as an example. the

It can be clearly seen from FIG. 3 that the current contactor according to this embodiment includes a static contact 1 arranged on a housing (not shown) of the current contactor; it can be closed and separated from the static contact 1 The moving contact 2 that moves between them, the moving contact 2 is set on the moving contact bracket 13, opposite to the static contact 1; the moving iron core 3 that can move between its suction position and the separation position, the moving iron core 3 is set on the housing of the contactor in the same way as in the prior art, so that the moving iron core 3 can move relative to the housing of the contactor to open and close the moving contact 2 and the static contact 1; fixed On the housing (not shown) of the contactor, it is used to attract the static iron core 11 of the moving iron core 3; An opening and closing mechanism that moves between a closed position and a separated position. The opening and closing mechanism includes a linkage mechanism and a tripping mechanism. The linkage mechanism is pivotally connected to the moving contact bracket 13 on which the moving contact 2 is arranged. Constructed to cooperate with the linkage mechanism to maintain the movable contact in the closed position. the

As shown in Figure 3, the linkage mechanism includes: a first linkage 5 and a second linkage 6, the first end of the first linkage 5 is pivotally connected to the movable contact bracket 13 and the first linkage 5 The second end is pivotally connected with the first end of the second link 6 . the

The tripping mechanism includes a latch 7 that is rotatable around an axis B relative to the housing of the contactor and a trip lever 4 that is rotatable at a first end around a first axis A fixed on the housing of the contactor . The second end of the trip lever 4 is a locking end 41 , and the lock catch 7 is provided with a locking slot 71 at a position corresponding to the locking end, and the locking end 41 can be inserted into the locking slot 71 . The second end of the second link 6 is pivotably connected to the substantially middle position of the trip lever 4, whereby the trip mechanism cooperates with the link mechanism to move the movable contact remain in the closed position. the

A push rod 8 is also arranged on the moving iron core 3, and the position of the push rod 8 roughly corresponds to one side of the lock catch 7, so as to push the lock catch 7 to rotate around the B-axis. the

In addition, the electric contactor of the present utility model is also provided with a breaking spring arranged between the shell of the electric contactor and the moving contact 2 for driving the breaking action of the moving contact and the shell of the electric contactor. Between the body and the moving iron core 3 is used to reset the moving iron core 3, and is arranged between the moving contact bracket 13 and the moving contact 2 to make the moving contact and the static contact tightly closed The combined contact spring 12, wherein the breaking spring arranged between the housing of the current contactor and the moving contact 2 is for the moving contact assembly (moving contact bracket 13 (see Figure 3), the moving contact 2 and the contact The head spring 12, etc.) acts an upward force, and when the mechanism is unbuckled, the moving contact assembly is urged to move upward quickly to break the current. Since these structures are the same as those in the prior art, details are not repeated here. the

In addition, in the current contactor of the present invention, a micro switch (not shown) is also provided, and the micro switch can be driven by any of the above-mentioned components, for example, it can be driven by any of the above-mentioned linkage mechanisms. Driven by the lock 7 and the trip rod 4 of the connecting rod or the trip mechanism. Moreover, it also includes a main coil (not shown) and an auxiliary coil (not shown) for driving the moving iron core 3 to move, and switching between the main coil and the auxiliary coil can be realized by the action of a corresponding micro switch. the

Below with reference to Fig. 2A-2D explanation according to the operating principle of the electric contactor of the present utility model:

First, as shown in FIG. 2A , the current contactor is in a disconnected state, and at this time, the movable contact 2 and the static contact 1 are separated. When the control circuit is connected, the main coil of the electromagnet is connected, so that the moving iron core 3 moves in the downward direction in the figure, thereby pushing the moving contact bracket 13 to move downward, thus realizing the moving contact 2 and the fast closing of the static contact 1, as shown in Figure 2B. Simultaneously, when the movable contact bracket 13 moves downward, the movable contact bracket 13 pulls down the first connecting rod 5 pivotally connected with it and the second connecting rod 6 pivotally connected with the first connecting rod 5 to disengage. The buckle 4 rotates clockwise around the first axis A through the second connecting rod 6, so that the locking end 41 of the trip lever 4 enters the lock groove 71 of the lock 7, so that the trip lever 4, the lock 7 and the first And the second connecting rod 5, 6 is self-locked under the action of the breaking spring reaction force (not shown) and the contact spring (not shown), thereby keeping the contacts of the contactor in the closed position, as shown in Figure 2B Show. At this time, the microswitch (not shown) is triggered by the corresponding part of the trigger, and switches between the main coil and the auxiliary coil, that is, the main coil is disconnected, and the electromagnet auxiliary coil is connected at the same time, so as to overcome the force of the moving iron. The reaction force of the back-moving spring that the core 3 resets keeps the moving iron core 3 in the suction position. Since the electromagnet only needs to overcome the reaction force of the return spring at this time, the energy consumption of this contactor is very low. the

Then, when the contactor needs to be disconnected, the auxiliary coil of the electromagnet is disconnected, and the moving iron core 3 moves in the upward direction in the figure under the action of the moving iron core return spring. The push rod 8 pushes the latch 7 so that the latch 7 rotates around the axis B clockwise in the drawing, as shown in FIG. 2C . At this time, the rotation of the lock catch 7 makes the lock between the lock groove 71 and the locking end 41 of the trip lever 4 be released, and the trip lever 4, the lock catch 7 and the first and second connecting rods 5, 6 are released. Stable structures are broken. The movable contact 2 quickly reaches the disconnected position under the double action of the breaking spring and the contact spring, as shown in FIG. 2D . the

According to the current contactor of the utility model, the closing of the moving contact 2 and the static contact 1 is maintained by the linkage mechanism and the tripping mechanism, and the moving iron core 3 only needs to overcome the effect of its own return spring, therefore, the auxiliary coil The required current is less, reducing energy consumption. At the same time, due to the cancellation of the electronic circuit board, the product performance is not affected by the line voltage and electromagnetic interference. the

The structure of the electric contactor with the opening and closing mechanism of the present invention and its operating principle and operation process have been described above. In order to verify that the electric contactor with the opening and closing mechanism according to the present invention has the characteristics of low energy consumption, the prior art The energy consumption of the product and the product after applying the utility model has been calculated:

Contact closure retention force required for a 20A AC contactor in the prior art:

The holding force F1 required by the electromagnet: 12N

Apply the tripping force required by the same specifications of the AC contactor of the utility model technology:

The holding force F2 required by the electromagnet: 3N

ξ＝F2/F1＝0.25

The larger the rated current, the smaller the ξ value, and the more obvious the advantages of the technology of the utility model. the

Although the present utility model has been described in detail above with reference to the preferred embodiments of the present utility model, the present utility model is not limited to the above-mentioned specific embodiments. For example, in the above-mentioned embodiments, the tripping mechanism keeps the movable contact In the closed position, however, the trip mechanism may also comprise separately arranged components to independently hold the movable contacts in the closed position. In addition, in the above embodiments, although the tripping lever is in the form of rotation, those skilled in the art can also use other forms of tripping levers, as long as they can assist in mechanically keeping the moving contact at the closed position. Accordingly, the scope of the present invention is to be limited only by the appended claims and their equivalents. the

Claims (9)

1. A current contactor, comprising: A static contact (1), which is fixedly arranged on the housing of the contactor; a moving contact (2) arranged to move between closed and separated positions from the stationary contact (1); a moving iron core (3) arranged to move between its engaged position and its disengaged position; and An opening and closing mechanism, the opening and closing mechanism causes the moving contact (2) to move between the closed position and the separated position in response to the movement of the moving iron core (3) between the suction position and the separation position , the opening and closing mechanism includes a link mechanism and a tripping mechanism, the tripping mechanism includes a lock (7) and a trip lever (4), and the trip lever (4) can be locked by the lock (7) , It is characterized in that the linkage mechanism includes a first linkage (5) and a second linkage (6), the first end of the first linkage (5) and the movable contact (2) are arranged on it. The contact bracket (13) is pivotally connected, the first end of the second connecting rod (6) is pivotally connected to the second end of the first connecting rod (5), and the second connecting rod (6) ) is pivotally connected to the trip lever (4), and the trip mechanism cooperates with the linkage mechanism to keep the movable contact (2) in the closed position. 2. The electric contactor according to claim 1, characterized in that, the trip lever (4) has a first end which is pivotally arranged on the housing of the electric contactor and can be moved by the The second end of the locking catch (7). 3. The electric contactor according to claim 2, characterized in that, the lock (7) is pivotably arranged on the housing of the electric contactor, so as to lock the trip lever Rotation between a latched position of the second end and an unlocked position releases the second end of the trip bar. 4. The electric contactor according to claim 3, characterized in that, in response to the movement of the moving iron core (3) between the engaging position and the separating position, the locking catch (7) is Rotation between the locked position and the unlocked position. 5. The electric contactor according to claim 4, characterized in that, the moving iron core (3) is provided with a push rod (8), and the push rod (8) pushes the lock (7) in the Rotate between the locked position and the unlocked position. 6. The electric contactor according to any one of claims 1 to 5, characterized in that, the trip lever (4) is pivotally connected to the linkage mechanism, so that by means of the linkage mechanism, The moving contact (2) is maintained in the closed position. 7. The electric contactor according to any one of claims 1 to 5, characterized in that, the electric contactor also includes a set between the housing of the electric contactor and the movable contact (2). The breaking spring used to drive the breaking action of the moving contact and the reset device arranged between the housing of the contactor and the moving iron core (3) to reset the moving iron core (3) spring. 8. The electric contactor according to claim 7, characterized in that, the electric contactor further comprises a main coil and an auxiliary coil for driving the movement of the moving iron core (3), and the main coil is powered to Make the moving iron core (3) move from the separation position to the suction position against the reaction force of the breaking spring and the return spring; the auxiliary coil is powered to make the moving iron core ( 3) Overcoming the reaction force of the return spring to keep at the engaging position. 9. The electric contactor according to claim 8, characterized in that, the electric contactor further comprises a micro switch, and the micro switch is controlled by the linkage mechanism, the tripping mechanism and the moving iron Either one of the cores drives, switching between supplying power to the primary coil and supplying power to the secondary coil.

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