Control and protection switch

Abstract

The utility model relates to a control and protection switch which comprises a base, an outer shell, a current transformer set, a permanent magnet coil mechanism, a main contact mechanism and a transmission piece, the permanent magnet coil mechanism is connected with the transmission piece, and the current transformer set is connected with the main contact mechanism. The main contact mechanism comprises a contactor body, a push rod, a static contact group, a contact support, a moving contact group and a contact spring. The contact support directionally slides in the contactor body. The moving contact group is installed on the contact support, one end of the push rod is fixedly connected with the contact support, and the other end of the push rod is arranged outside the contactor body in a penetrating manner. The contact spring acts between the contactor body and the contact support, and the moving contact group is located above the static contact group in an initial state. When the control and protection switching device is switched on, the transmission piece acts on the ejector rod to enable the contact spring to be compressed, and the moving contact set is switched on with the static contact set. The device has the advantages of being good in stability and reliability in the working process and improving the use performance of products.

Description

Technical Field

[0001] The present application relates to the technical field of low-voltage electrical appliances, and in particular to a control and protection switch. Background Art

[0002] As an integrated electrical product in the field of low-voltage electrical appliances, control and protection switches are increasingly widely used because they realize integrated and internally coordinated control and protection functions in a single structural form of product. They can replace a variety of traditional discrete components such as circuit breakers (fuses), contactors, overload relays, starters, isolators and auxiliary electrical appliances.

[0003] At present, a commonly used control and protection switch on the market is a horizontal structure, and the working principle of its electromagnetic operating mechanism is: when the control power circuit energizes the coil of the AC electromagnet, the moving iron core generates electromagnetic force after the coil is energized and overcomes the reaction force of the spring to move horizontally toward the static iron core until it is attracted together; and in the process of the moving iron core moving toward the static iron core, the arm support of the transmission mechanism drives the moving contact of the main circuit to be linked, and when the moving iron core and the static iron core are attracted together, the moving contact is closed with the static contact under the action of the reset spring to achieve the connection of the main circuit, and the moving iron core relies on the electromagnetic force to overcome the reaction force of the spring to maintain the attraction with the static iron core; when the control power circuit de-energizes the coil of the AC electromagnet, or when the external power supply is suddenly cut off, the electromagnetic force used to keep the moving iron core and the static iron core attracted disappears, and the moving iron core moves in the direction of separating from the static iron core under the reaction force of the spring, and at the same time, the moving contact is linked to the static contact through the transmission mechanism to achieve the disconnection of the main circuit.

[0004] In the prior art, the control and protection switch relies on electromagnetic force to overcome the reaction force of the spring to keep the main circuit connected for a long time. Therefore, when the switch works for a long time, the electromagnetic coil must be energized for a long time, and the coil will inevitably accumulate a certain amount of heat after being energized for a long time; and the static contact and the moving contact in the main contact mechanism are connected by the continuous action of the spring reset force to make the two contact each other, and the elastic performance of the spring is gradually weakened in a long-term high-temperature working environment. Over time, the static contact and the moving contact have poor contact due to the spring factor, and the reliability is gradually weakened, affecting the usability of the product. Utility Model Content

[0005] The present application provides a control and protection switch, which has good stability and reliability during operation and improves the performance of the product.

[0006] The present application provides a control and protection switch adopting the following technical solution:

[0007] A control and protection switch, comprising a base, a housing covering the base, and a current transformer group, a permanent magnet coil mechanism, a main contact mechanism and a transmission member respectively installed on the base. The permanent magnet coil mechanism is connected to the transmission member, and the current transformer group is connected to the main contact mechanism. The main contact mechanism includes a contactor body installed on the base, a push rod, and a static contact group, a contact support, a moving contact group and a contact spring arranged inside the contactor body. The contact support slides directionally inside the contactor body; the moving contact group is installed on the contact support, one end of the push rod is fixedly connected to the contact support, and the other end thereof is arranged outside the contactor body; the contact spring acts between the contactor body and the contact support, and in the initial state, the moving contact group is located above the static contact group; when the control and protection switch is turned on, the transmission member acts on the push rod to compress the contact spring, and the moving contact group is connected to the static contact group.

[0008] Preferably, the permanent magnet coil mechanism includes a rectangular housing installed on the base, a static iron core fixedly installed below the interior of the rectangular housing, a moving iron core slidably installed in the vertical direction in the rectangular housing and located above the static iron core, an AC coil fixedly installed between the static iron core and the moving iron core, and a rebound spring acting between the static iron core and the moving iron core; the transmission member is connected to the moving iron core and one end extends to the outside of the rectangular housing and acts on the push rod to control the on-off of the main contact mechanism.

[0009] Preferably, a card slot portion is provided on one side where the transmission member extends outside the rectangular housing, and the free end of the push rod is located in the card slot of the card slot portion.

[0010] Preferably, the transmission member includes a U-shaped portion, the free end of the push rod is located in the U-shaped groove of the U-shaped portion, and a guiding groove is provided on the side wall of the rectangular housing, and one side of the U-shaped portion slides directionally in the guiding groove.

[0011] Preferably, a guiding post is fixedly installed on the transmission member, and a guiding hole is provided on the rectangular housing, and the guiding post slidably passes through the guiding hole.

[0012] Preferably, the permanent magnet coil mechanism includes a rectangular housing installed on the base, a static iron core fixedly installed on one side of the interior of the rectangular housing, a moving iron core slidably installed in the horizontal direction in the rectangular housing and located on the other side of the static iron core, an AC coil fixedly installed between the static iron core and the moving iron core, and a rebound spring acting between the static iron core and the moving iron core; the transmission member is connected to the moving iron core and one end extends to the outside of the rectangular housing and acts on the push rod to control the on-off of the main contact mechanism.

[0013] Preferably, a current short - circuit release is connected to the contactor body, and the current short - circuit release is electrically connected to the control power supply circuit of the control and protection switch; a relief groove is formed in the ejector rod. When the control and protection switch electrical appliance is short - circuited, the drive rod of the current short - circuit release extends into the relief groove and is used to restrict the movement of the ejector rod towards the static contact group.

[0014] In summary, the present application includes at least one of the following beneficial technical effects:

[0015] The control power supply circuit in the control and protection switch energizes the AC coil. After the AC coil is energized, the moving iron core generates an electromagnetic force and moves vertically towards the static iron core against the reaction force of the return spring until they are attracted together. During the movement of the moving iron core towards the static iron core, one end of the transmission part acts on the ejector rod of the main contact mechanism, causing the contact spring to be compressed, and the moving contact group contacts the static contact group, and the main contact mechanism is connected; when the control power supply circuit cuts off the power supply of the coil of the AC electromagnet, or when the external power supply suddenly cuts off, the electromagnetic force used to keep the moving iron core and the static iron core attracted disappears. The moving iron core moves upward in the direction of separating from the static iron core under the reaction force of the return spring. At the same time, the acting force of the transmission part on the ejector rod disappears, and the contact support moves upward under the reset action of the contact spring. At this time, the moving contact group and the static contact group are separated, realizing the disconnection of the main circuit;

[0016] By providing a card slot part and a guide hole in the transmission part, and a card slot part at the free end of the ejector rod, during the movement of the transmission part relative to the rectangular housing, the free end of the ejector rod is located in the card slot of the card slot part, and the guide post slides in the guide hole, improving the stability of the transmission part acting on the main contact mechanism and further improving the overall stability of the transmission part when sliding on the rectangular housing;

[0017] By connecting a current short - circuit release to the contactor body, and the current short - circuit release is electrically connected to the control power supply circuit in the control and protection switch electrical appliance. When the control and protection switch electrical appliance is short - circuited, the drive rod of the current short - circuit release extends into the relief groove and is used to restrict the movement of the ejector rod towards the static contact group, thereby restricting the downward pressure of the transmission part, and preventing the attraction between the static iron core and the moving iron core. When the control and protection switch electrical appliance is short - circuited, the operating mechanism in the protection switch electrical appliance cannot be kept in the closed state, effectively protecting the safety of electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural view of the control and protection switch in Embodiment 1;

[0019] Figure 2 is a schematic structural view of Embodiment 1 excluding the outer housing;

[0020] Figure 3 is a main view of the partial structure inside Embodiment 1;

[0021] Figure 4 Schematic diagram of the structure among the permanent magnet coil mechanism, the main contact mechanism and the transmission member in Embodiment 1;

[0022] Figure 5 is Figure 4 Cross-sectional view at the center line of the permanent magnet coil mechanism in;

[0023] Figure 6 Schematic diagram of the structure among the permanent magnet coil mechanism, the main contact mechanism and the transmission member in Embodiment 2;

[0024] Figure 7 is Figure 6 Internal partial structure diagram of Embodiment 2 in;

[0025] Figure 8 Schematic diagram of the structure among the permanent magnet coil mechanism, the main contact mechanism and the transmission member in Embodiment 3;

[0026] Figure 9 is Figure 8 Internal partial structure diagram of Embodiment 3 in.

[0027] Explanation of reference numerals: 1, base; 2, outer shell; 3, current transformer group; 4, permanent magnet coil mechanism; 41, rectangular housing; 411, guide hole; 412, guide groove; 42, static iron core; 43, moving iron core; 44, AC coil; 45, rebound spring; 5, main contact mechanism; 51, contactor body; 52, ejector rod; 521, relief groove; 522, wedge surface; 53, static contact group; 54, contact support; 55, moving contact group; 56, contact spring; 57, current short-circuit release; 6, transmission member; 61, guide post; 62, card slot part; 63, U-shaped part. Detailed description of the specific implementation

[0028] The following further describes the present application in detail with reference to the accompanying drawings.

[0029] The embodiments of the present application disclose a control and protection switch. Embodiment 1

[0030] Referring to Figures 1 to 3 , the control and protection switch includes a base 1, an outer shell 2 covering the base 1, and a current transformer group 3, a permanent magnet coil mechanism 4, a main contact mechanism 5, and a transmission member 6 respectively installed on the base 1. The permanent magnet coil mechanism 4 is connected to the transmission member 6, and the current transformer group 3 is connected to the main contact mechanism 5; the control power circuit, the current transformer group 3 and the setting method in the control and protection switch already belong to the conventional setting means in the technical field, so they will not be described in detail in this embodiment.

[0031] Combined withFigures 2 to 5 Among them, the permanent magnet coil mechanism 4 includes a rectangular housing 41 installed on the base 1, a static iron core 42 fixedly installed below the interior of the rectangular housing 41, a moving iron core 43 vertically and directionally slidably installed within the rectangular housing 41 and above the static iron core 42, an alternating current coil 44 fixedly installed between the static iron core 42 and the moving iron core 43, and a rebound spring 45 acting between the static iron core 42 and the moving iron core 43.

[0032] The transmission member 6 is fixedly connected to the moving iron core 43 and one end extends to the outside of the rectangular housing 41 and acts on the main contact mechanism 5 to control its on-off; by controlling the control power circuit in the control and protection switch to energize the alternating current coil 44, the moving iron core 43 generates an electromagnetic force after the alternating current coil 44 is energized and overcomes the reaction force of the rebound spring 45 to vertically move downward toward the static iron core 42 until they are attracted together. During the process of the moving iron core 43 moving toward the static iron core 42, one end of the transmission member 6 acts on the main contact mechanism 5 to control the main contact mechanism 5 to be turned on.

[0033] The main contact mechanism 5 includes a contactor body 51 installed on the base 1, a push rod 52, and a static contact set 53, a contact support 54, a moving contact set 55, and a contact spring 56 arranged within the contactor body 51, and the contact support 54 is vertically and directionally slidable inside the contactor body 51; the moving contact set 55 is installed on the contact support 54, one end of the push rod 52 is fixedly connected to the contact support 54, and the other end thereof is arranged outside the contactor body 51; the contact spring 56 acts between the contactor body 51 and the contact support 54, and in the initial state, the moving contact set 55 is located above the static contact set 53; when the control and protection switch electrical appliance is turned on, the transmission member 6 acts on the push rod 52 to cause the contact spring 56 to be compressed, and the moving contact set 55 contacts the static contact set 53, and the main contact mechanism 5 is turned on.

[0034] To improve the stability of the transmission member 6 acting on the main contact mechanism 5, a slot portion 62 is provided on one side of the transmission member 6 extending outside the rectangular housing 41, and the free end of the push rod 52 is located in the slot of the slot portion 62; at the same time, a guiding column 61 is fixedly installed on the transmission member 6, and a guiding hole 411 is formed on the rectangular housing 41, and the guiding column 61 slidably penetrates through the guiding hole 411; during the movement of the transmission member 6 relative to the rectangular housing 41, by sliding the guiding column 61 in the guiding hole 411, the overall stability of the transmission member 6 sliding on the rectangular housing 41 is further improved.

[0035] The implementation principle is as follows: The control power circuit in the control and protection switch energizes the AC coil 44. After the AC coil 44 is energized, the moving iron core 43 generates an electromagnetic force and moves vertically towards the static iron core 42 against the reaction force of the return spring 45 until they are attracted together. During the movement of the moving iron core 43 towards the static iron core 42, one end of the transmission member 6 acts on the ejector rod 52 of the main contact mechanism 5, and the main contact mechanism 5 is closed, realizing the closing of the main circuit. When the control power circuit de-energizes the coil of the AC electromagnet or when the external power supply suddenly cuts off, the electromagnetic force for keeping the moving iron core 43 and the static iron core 42 attracted disappears. The moving iron core 43 moves upward in the direction of separating from the static iron core 42 under the reaction force of the return spring 45. At the same time, the acting force of the transmission member 6 on the ejector rod 52 disappears, and the contact support 54 moves upward under the reset action of the contact spring 56. At this time, the moving contact group 55 and the static contact group 53 are separated, realizing the opening of the main circuit. Even when working in a high-temperature working environment for a long time, the main trigger spring has a certain elasticity, and the moving contact group 55 and the static contact group 53 can be reset through the contact spring 56 to achieve disconnection, having the effect of good stability and reliability during operation;

[0036] When the current in the control power circuit is abnormal or short-circuited, the drive rod of the current short-circuit release 57 in the main contact mechanism 5 extends into the relief groove 521 on the transmission member 6, which is used to limit the movement of the ejector rod 52 towards the static contact group 53, thereby restricting the downward pressure of the transmission member 6, and preventing the attraction between the static iron core 42 and the moving iron core 43. When the control and protection switch is short-circuited, the operating mechanism in the control and protection switch cannot rotate. Further, when the current or voltage in the control power circuit is abnormal, the safety of electrical equipment can be effectively protected. Embodiment 2

[0037] A control and protection switch, combined with Figure 1 、 Figure 8 、 Figure 9 The difference from Embodiment 1 lies in that the structure of the transmission member 6 acting on the ejector rod 52 in the main contact mechanism 5 is different. Specifically, the transmission member 6 includes a U-shaped portion 63, and the free end of the ejector rod 52 is located in the U-shaped groove of the U-shaped portion 63. The transmission member 6 and the ejector rod 52 are limited by the U-shaped portion 63, improving the stability of the transmission member 6 acting on the ejector rod 52. At the same time, a guide groove 412 is provided on the side wall of the rectangular housing 41, and one side of the U-shaped portion 63 slides directionally in the guide groove 412, further improving the overall stability of the transmission member 6 when sliding on the rectangular housing 41. Embodiment 3

[0038] A control and protection switch, combined with Figure 1 、 Figure 6 、 Figure 7, which is different from Embodiment 1 in that the permanent magnet coil mechanism 4 includes a rectangular housing 41 mounted on the base 1, a static iron core 42 fixedly mounted on one side inside the rectangular housing 41, a moving iron core 43 slidably mounted horizontally in the rectangular housing 41 and located on the other side of the static iron core 42, an AC coil 44 fixedly mounted between the static iron core 42 and the moving iron core 43, and a rebound spring 45 acting between the static iron core 42 and the moving iron core 43; the transmission member 6 is connected to the moving iron core 43 and one end extends to the outside of the rectangular housing 41 and acts on the ejector rod 52 to control the on-off of the main contact mechanism 5; wedge-shaped surfaces 522 are provided at the ends of both the ejector rod 52 and one end of the connecting member.

[0039] In the control and protection switch, the control power circuit energizes the AC coil 44. After the AC coil 44 is energized, the moving iron core 43 generates an electromagnetic force and moves horizontally toward the static iron core 42 against the reaction force of the rebound spring 45 until they are attracted together. During the movement of the moving iron core 43 toward the static iron core 42, one end of the transmission member 6 acts on the ejector rod 52, causing the contact spring 56 to be compressed. Finally, the moving contact group 55 contacts the static contact group 53, and the main contact mechanism 5 is turned on.

[0040] To improve the safety and stability of the main contact mechanism 5 during operation, the contactor body 51 is connected with a current short-circuit release 57, and the current short-circuit release 57 is electrically connected to the control power circuit in the control and protection switch electrical appliance; when the control and protection switch electrical appliance is short-circuited, the driving rod of the current short-circuit release 57 drives one end of the transmission member 6 to rotate, thereby changing the pressing distance of the transmission member 6, and further making the transmission member 6 unable to act on the ejector rod 52, and the moving contact group 55 and the static contact group 53 cannot contact, so as to prevent the attraction between the static iron core 42 and the moving iron core 43, and realize that when the control and protection switch electrical appliance is short-circuited, the operating mechanism cannot remain in the on state, effectively protecting the safety of electrical equipment.

[0041] The above are all the preferred embodiments of this application, and the protection scope of this application is not limited hereby. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A control and protection switch, comprising a base (1), an outer housing (2) covering the base (1), a current transformer group (3), a permanent magnet coil mechanism (4), a main contact mechanism (5) and a transmission member (6) respectively installed on the base (1), the permanent magnet coil mechanism (4) is connected to the transmission member (6), and the current transformer group (3) is connected to the main contact mechanism (5), characterized in that: The main contact mechanism (5) includes a contactor body (51) mounted on the base (1), a push rod (52), and a static contact group (53), a contact support (54), a moving contact group (55), and a contact spring (56) arranged inside the contactor body (51). The contact support (54) slides directionally inside the contactor body (51); the moving contact group (55) is mounted on the contact support (54), one end of the push rod (52) is fixedly connected to the contact support (54), and the other end thereof is arranged outside the contactor body (51) in a penetrating manner; the contact spring (56) acts between the contactor body (51) and the contact support (54), and in the initial state, the moving contact group (55) is located above the static contact group (53); when the control and protection switch electrical appliance is turned on, the transmission member (6) acts on the push rod (52) to compress the contact spring (56), and the moving contact group (55) is connected to the static contact group (53).

2. The control and protection switch according to claim 1, characterized in that: The permanent magnet coil mechanism (4) includes a rectangular housing (41) mounted on the base (1), a static iron core (42) fixedly mounted below the interior of the rectangular housing (41), a moving iron core (43) slidably mounted in the vertical direction inside the rectangular housing (41) and located above the static iron core (42), an AC coil (44) fixedly mounted between the static iron core (42) and the moving iron core (43), and a rebound spring (45) acting between the static iron core (42) and the moving iron core (43); the transmission member (6) is connected to the moving iron core (43) and one end thereof extends outside the rectangular housing (41) and acts on the push rod (52) to control the on / off of the main contact mechanism (5).

3. The control and protection switch according to claim 2, characterized in that: A card slot portion (62) is provided on one side where the transmission member (6) extends outside the rectangular housing (41), and the free end of the push rod (52) is located in the card slot of the card slot portion (62).

4. The control and protection switch according to claim 2, characterized in that: The transmission member (6) includes a U-shaped portion (63), the free end of the push rod (52) is located in the U-shaped groove of the U-shaped portion (63), and a guiding groove (412) is provided on the side wall of the rectangular housing (41), and one side of the U-shaped portion (63) slides directionally in the guiding groove (412).

5. The control and protection switch according to claim 3 or 4, characterized in that: A guiding column (61) is fixedly mounted on the transmission member (6), and a guiding hole (411) is provided on the rectangular housing (41), and the guiding column (61) slidably penetrates through the guiding hole (411).

6. The control and protection switch according to claim 1, characterized in that: The permanent magnet coil mechanism (4) includes a rectangular housing (41) mounted on the base (1), a stationary iron core (42) fixedly installed on one side inside the rectangular housing (41), a moving iron core (43) horizontally and directionally slidably installed inside the rectangular housing (41) and located on the other side of the stationary iron core (42), an AC coil (44) fixedly installed between the stationary iron core (42) and the moving iron core (43), and a rebound spring (45) acting between the stationary iron core (42) and the moving iron core (43); the transmission member (6) is connected to the moving iron core (43) and one end extends to the outside of the rectangular housing (41) and acts on the ejector rod (52) to control the on-off of the main contact mechanism (5).

7. The control and protection switch according to claim 6, characterized in that: The contactor body (51) is connected with a current short-circuit release (57), and the current short-circuit release (57) is electrically connected to the control power supply circuit of the control and protection switch; a relief groove (521) is formed in the ejector rod (52), and when the control and protection switch electrical appliance is short-circuited, the driving rod of the current short-circuit release (57) extends into the relief groove (521) to limit the movement of the ejector rod (52) in the direction of the static contact group (53).

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