A double-coil monostable relay

Abstract

The present invention relates to the technical field of switch electrical appliances, and specifically to a double-coil monostable relay, comprising a contact, a reset spring and a coil part, wherein the coil part is used to selectively switch power on and off to control the contact to be attracted or disconnected; the coil part comprises an attraction coil and a disconnection coil, wherein the attraction coil is used to overcome the elastic force of the reset spring to drive the contact to be attracted in the energized state and continuously energize the contact to keep the contact in the attracted state, and the disconnection coil is used to cooperate with the reset spring to drive the contact to disconnect in the energized state, so that the relay forms a monostable operation and prevents the contact from sticking. The present invention sets a disconnection coil, and when the monostable relay is disconnected, the disconnection coil and the reset spring work together to drive the contact to disconnect. Compared with the existing monostable relay that only relies on the reset spring to disconnect the contact, the contact disconnection driving force of the present invention is greater, which can prevent the contact from sticking, thereby reducing the safety accidents caused by the contact sticking, and improving the reliability and safety of the relay operation.

Description

Technical Field

[0001] The invention relates to the technical field of switch electrical appliances, and in particular to a double-coil monostable relay. Background Art

[0002] The moving contact of the relay is controlled by a coil and a reset spring. When the coil is energized, the magnetic force generated overcomes the elastic force of the reset spring to drive the moving contact. When the coil is de-energized, the moving contact is reset under the elastic force of the reset spring, thereby achieving the purpose of controlling the on and off of the moving and static contacts. However, after a period of use, the moving contact and the static contact may not be disconnected due to sticking, and the elastic force of the reset spring is not enough to drive the moving and static contacts to disconnect. The inability of the moving and static contacts to disconnect will cause the relay load to form an unexpected conduction, and may even cause a safety accident. Summary of the invention

[0003] The object of the present invention is to provide a double-coil monostable relay to solve the above-mentioned technical problem of contact sticking and being unable to be disconnected.

[0004] To achieve the above-mentioned purpose, the technical solution of the present invention is: a double-coil monostable relay, comprising contacts, a reset spring and a coil part, wherein the coil part is used to selectively turn on and off the power to control the contacts to be attracted or disconnected; the coil part comprises a pull-in coil and a disconnecting coil, wherein the pull-in coil is used to overcome the elastic force of the reset spring to drive the contacts to be attracted in the energized state and continuously energize to keep the contacts in the attracted state, and the disconnecting coil is used to cooperate with the reset spring to drive the contacts to be disconnected in the energized state, so that the relay forms a monostable operation and prevents the contacts from sticking.

[0005] In one embodiment, a control module is further included, and the pull-in coil and the disconnecting coil are electrically connected to the control module respectively. The control module is used to receive a control signal and control the pull-in coil and the disconnecting coil to be energized respectively to make the contacts close or disconnect.

[0006] In one embodiment, it further includes a contact state detector electrically connected to the contact, the contact state detector is used to detect whether the contact is in an attracted state, and the contact state detector is electrically connected to the control module to feed back the contact state to the control module.

[0007] In one embodiment, it includes two static lead-out terminals, each of which is provided with a static contact, the contact state detector is a conductive part made of conductive material, each of the static lead-out terminals is connected to one of the conductive parts, and the two conductive parts form a closed loop with the aid of the control module when the contacts are in the energized state.

[0008] In one embodiment, the contact includes a moving contact and a stationary contact, the disconnecting coil and the attracting coil are arranged along the movement direction of the moving contact, and the disconnecting coil is located in the disconnecting direction of the moving contact relative to the attracting coil.

[0009] In one embodiment, it also includes a moving contact part, which includes the moving contact point, a movable rod and a moving iron core. The moving contact point and the moving iron core are respectively arranged at the two ends of the movable rod. The attraction coil is provided with an attraction static iron core, and the breaking coil is provided with a breaking static iron core. The attraction static iron core and the breaking static iron core are respectively arranged at the two ends of the moving iron core, so that the attraction static iron core and the breaking static iron core respectively attract the moving iron core to make the moving contact move in the direction close to or away from the static contact, forming the attraction or breaking of the contact.

[0010] In one embodiment, the coil part includes a suction coil frame and a disconnecting coil frame, the suction coil is provided on the suction coil frame, a suction yoke is provided outside the suction coil frame, the disconnecting coil is provided on the disconnecting coil frame, and a disconnecting yoke is provided outside the disconnecting coil frame; the positioning between the disconnecting coil frame and the suction coil frame is formed by plugging the disconnecting yoke into the suction coil frame, or the positioning between the disconnecting coil frame and the suction coil frame is formed by plugging the suction yoke into the disconnecting coil frame.

[0011] In one embodiment, the breaking yoke is provided with a plurality of connecting posts extending toward the direction of the attracting coil frame, and the attracting coil frame is provided with a plurality of connecting holes corresponding to the connecting posts, and the connecting posts are inserted into the connecting holes to form the connection between the breaking yoke and the attracting coil frame.

[0012] In one embodiment, a protrusion is provided on the side of the connecting column, and the protrusion is interference fit with the connecting hole.

[0013] In one embodiment, the relay comprises a housing, wherein the contacts, the return spring and the coil part are all arranged in the housing, and the relay is installed horizontally or vertically with the aid of the housing.

[0014] The beneficial effects of the present invention are:

[0015] 1. The present invention sets a disconnect coil. When the monostable relay is disconnected, the disconnect coil and the reset spring work together to drive the contact to disconnect. Compared with the monostable relay in the prior art that only relies on the reset spring to disconnect the contact, the contact disconnection driving force of the present invention is greater, which can prevent the contact from sticking, thereby reducing the safety accidents caused by the contact sticking, and improving the reliability and safety of the relay operation.

[0016] 2. The contact state detector is set up to detect the contact state in time, so that the disconnecting coil is energized to drive the contact to disconnect, so as to prevent the contact from maintaining an unexpected closed state for a long time. Even if the contact remains in an unexpected closed state for a long time, it can be discovered in time to serve as a warning and avoid further danger.

[0017] 3. The attracting coil and the breaking coil are arranged along the movement direction of the moving contact. The attracting static iron core and the breaking static iron core can respectively generate magnetic force in the same direction as the movement direction on the moving iron core, making the movement of the moving contact more sensitive.

[0018] 4. The connection formed by the connecting hole on the pull-in coil frame and the connecting column on the disconnecting yoke is used to indirectly fix the relative position relationship between the pull-in coil and the disconnecting coil, ensuring the coaxiality of the pull-in coil frame and the disconnecting coil frame, so that the moving iron core has sufficient space for movement and can maintain a reduced air gap with the magnetic conductive parts (such as magnetic conductive cylinder and yoke), thereby ensuring that the magnetic resistance of the magnetic line circuit formed when the pull-in coil or the disconnecting coil is energized is smaller. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional diagram of an embodiment of a vertical relay of the present invention.

[0020] Figure 2 It is a top view of an embodiment of a vertical relay of the present invention.

[0021] Figure 3 yes Figure 2 AA section view.

[0022] Figure 4 yes Figure 2 BB cross-sectional view.

[0023] Figure 5 The structure of the embodiment of the present invention without a housing Figure 1 .

[0024] Figure 6 The structure of the embodiment of the present invention without a housing Figure 2 .

[0025] Figure 7 It is a partial structural diagram of an embodiment of the present invention.

[0026] Figure 8 4 is a structural diagram of a conductive member according to an embodiment of the present invention.

[0027] Fig. 9 1 is a circuit diagram of an embodiment of the present invention.

[0028] Fig.10 It is a stereogram of an embodiment of a horizontal relay of the present invention.

[0029] Fig.11It is a three-dimensional diagram of a horizontal relay embodiment of the present invention without a housing.

[0030] Wherein: 1 coil part, 11 attracting coil, 111 attracting coil frame, 1111 connecting hole, 1112 boss, 112 attracting static iron core, 113 attracting magnetic tube, 114 attracting yoke, 115 attracting lead-out terminal, 12 breaking coil, 121 breaking coil frame, 122 breaking static iron core, 123 breaking magnetic tube, 124 breaking yoke, 1241 connecting column, 1242 boss, 125 breaking lead-out terminal, 2 moving contact part, 21 moving contact, 22 movable rod, 23 iron core, 3 static lead-out terminal, 31 static contact, 32 wiring hole, 4 reset spring, 5 control module, 51 first input lead-out pin, 52 second input lead-out pin, 53 third input lead-out pin, 6 contact state detector, 60 conductive member, 61 contact part, 611 boss, 62 connecting part, 7 shell. DETAILED DESCRIPTION

[0031] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0032] See also Figures 1 to 3 As shown, the present invention discloses a double-coil monostable relay, including a contact, a reset spring 4 and a coil part 1, wherein the contact includes a moving contact 21 and a static contact 31, and the coil part 1 is used to selectively switch on and off the power to control the contact to be attracted or disconnected. The moving contact 21 is arranged on the moving contact part 2, and the moving contact part 2 also includes a movable rod 22 and a movable iron core 23, and the moving contact 21 and the movable iron core 23 are respectively arranged at the two ends of the movable rod 22. The static contact 31 is arranged on the static lead-out terminal 3, and two static lead-out terminals 3 are provided, and the two static lead-out terminals 3 are arranged at intervals. One end face of the static lead-out terminal 3 is provided with a wiring hole 32 for connecting the load, and the other end face forms the static contact 31. The moving contact 21 of this example is formed by a long strip of conductive member, which can be pressed against the two static contacts 31 to form an electrical connection between the two static contacts 31, and the contact is in the attracted state at this time.

[0033] The coil part 1 includes a pull-in coil 11 and a disconnecting coil 12. The pull-in coil 11 is used to overcome the elastic force of the reset spring 4 to drive the contacts to be pulled in when powered on and to keep the contacts powered on to keep them in the pulled-in state. The disconnecting coil 12 is used to cooperate with the reset spring 4 to drive the contacts to disconnect when powered on, so that the relay forms a monostable operation and prevents the contacts from sticking.

[0034] The attraction coil 11 is arranged on the attraction coil frame 111, and an attraction static iron core 112 is arranged inside the attraction coil 11. The reset spring 4 is arranged between the attraction static iron core 112 and the moving iron core 23. When the attraction coil 11 is energized, the magnetic attraction force generated by the attraction static iron core 112 on the moving iron core 23 causes the contacts to be attracted.

[0035] The breaking coil 12 is arranged on a breaking coil frame 121 . A breaking static iron core 122 is arranged inside the breaking coil 12 . When the breaking coil 12 is energized, the breaking static iron core 122 generates a magnetic attraction force on the moving iron core 23 .

[0036] The difference between the monostable relay of the present invention and the conventional monostable relay is that: after the pull-in coil 11 is powered off, the conventional monostable relay only relies on the elastic force of the reset spring 4 to drive the moving iron core 23 away from the pull-in static iron core 112, that is, only relies on the elastic force of the reset spring 4 to disconnect the contact; after the pull-in coil 11 is powered off, the magnetic attraction force generated by the power-on of the disconnecting coil 12 and the elastic force of the reset spring 4 combine to make the moving iron core 23 move away from the pull-in static iron core 112. Compared with the prior art, the present invention has a greater driving force for contact disconnection, thereby preventing contact sticking, thereby reducing safety accidents caused by contact sticking, and improving the reliability and safety of relay operation.

[0037] See also Figure 3 As shown, the attracting static iron core 112 and the breaking static iron core 122 of this example are respectively arranged at the two ends of the moving iron core 23, and the breaking static iron core 122 is arranged in the direction away from the moving contact 21 relative to the attracting static iron core 112, and the two rely on magnetic attraction to drive the moving iron core 23 to move; the attracting coil 11 and the breaking coil 12 are correspondingly arranged along the movement direction of the moving contact 21, and the breaking coil 12 is located in the breaking direction of the moving contact 21 relative to the attracting coil 11. In other embodiments, the positions of the attracting static iron core 112 and the breaking static iron core 122 can be swapped, and correspondingly, the positions of the attracting coil 11 and the breaking coil 12 can also be swapped. At this time, the attracting static iron core 112 and the breaking static iron core 122 respectively rely on magnetic repulsion to drive the moving iron core 23 to move, and in order to form magnetic repulsion, the moving iron core 23 should be provided with a permanent magnet.

[0038] See also Figures 3 to 5As shown, both ends of the moving iron core 23 extend into the inside of the attracting coil frame 111 and the breaking coil frame 121 respectively, and in order to reduce the magnetic resistance of the magnetic lines of force formed after the coil is energized, the air gap between the moving iron core 23 and the attracting magnetic cylinder 113, and between the moving iron core 23 and the breaking magnetic cylinder 123 cannot be too large, so the coaxiality between the attracting coil frame 111 and the breaking coil frame 121 and the relative fixation of the two have a greater impact on the movement of the moving iron core 23. In this example, the breaking yoke 124 outside the breaking coil frame 121 is plugged into the attracting coil frame 111 to ensure the positioning between the attracting coil frame 111 and the breaking coil frame 121. The breaking yoke 124 is fixedly connected to the breaking coil frame 121. The yoke is made of metal material, and the coil frame is made of plastic. The connection between metal and plastic is more reliable and has a smaller connection gap than the connection between plastic and plastic. Therefore, compared with the direct connection between the suction coil frame 111 and the breaking coil frame 121, the indirect connection between the suction coil frame 111 and the breaking coil frame 121 formed by the breaking yoke 124 in this example can improve the reliability of the relative fixed connection between the two. In other embodiments, the suction coil frame 111 and the breaking coil frame 121 can also be indirectly connected by plugging the suction yoke 114 outside the suction coil frame 111 into the breaking coil frame 121.

[0039] More specifically, the breaking yoke 124 is provided with a plurality of connecting posts 1241 extending in the direction of the suction coil frame 111, and the suction coil frame 111 is provided with a plurality of connecting holes 1111 corresponding to the connecting posts 1241, and the connecting posts 1241 are plugged into the connecting holes 1111 to form the plug-in connection between the breaking yoke 124 and the suction coil frame 111. In order to ensure that the connecting holes 1111 and the connecting posts 1241 have sufficient connection strength, the connecting holes 1111 are arranged in the protruding posts 1112 on the suction coil frame 111. In this example, there are four connecting posts 1241 and connecting holes 1111 respectively, and they are arranged at intervals in the four directions of front, back, left, and right, so that the breaking yoke 124 and the suction coil frame 111 are connected at four points. In other embodiments, the connecting posts 1241 and the connecting holes 1111 can be provided with three or two respectively, but the two connecting posts 1241 located on the same side should be extended to form a whole, and the two connecting holes 1111 located on the same side should be extended to form a whole accordingly.

[0040] In order to further enhance the reliability of the connection between the pull-in coil frame 111 and the disconnection coil frame 121, a protrusion 1242 is provided on the side of the connection column 1241, and the protrusion 1242 is interference fit with the connection hole 1111. Since the pull-in coil frame 111 is made of plastic and the disconnection yoke 124 is made of metal, although the protrusion 1242 is interference fit with the connection hole 1111, the protrusion 1242 provided on the connection column 1241 can expand and deform the side wall of the connection hole 1111, thereby increasing the connection strength between the connection column 1241 and the connection hole 1111.

[0041] See also Figure 6 and Fig. 9 As shown, the relay of the present invention also includes a control module 5, and the pull-in coil 11 and the disconnecting coil 12 are electrically connected to the control module 5 respectively. The control module 5 is used to receive a control signal and control the pull-in coil 11 and the disconnecting coil 12 to be energized respectively, so that the contacts are pulled in or disconnected. The pull-in coil 11 is electrically connected to the control module 5 through two pull-in lead-out terminals 115, and the disconnecting coil 12 is electrically connected to the control module 5 through two disconnecting lead-out terminals 125. The control signal comes from an external control system and is connected to the control system through the first input lead-out pin 51 on the control module 5, so as to transmit the control signal of the control system to the control module 5. The control module 5 is also provided with a second input lead-out pin 52 and a third input lead-out pin 53, and power is supplied to the control module 5 through the second input lead-out pin 52 and the third input lead-out pin 53. The control module 5 then energizes the pull-in coil 11 and the disconnecting coil 12 respectively as needed.

[0042] See also Figures 7 to 9 As shown, the relay of the present invention also includes a contact state detector 6 electrically connected to the contact, and the contact state detector 6 is used to detect whether the dynamic and static contacts are in the attracted state, and the contact state detector 6 is electrically connected to the control module 5 to feed back the contact state to the control module 5. The control module 5 can judge whether to energize the attracting coil 11 and the disconnecting coil 12 according to the contact state. The contact state detector 6 of this example is a conductive member 60 made of conductive material, each static lead-out terminal 3 is connected to a conductive member 60, and the two conductive members 60 form a closed loop with the help of the control module 5 when the contacts are attracted. The conductive member 60 includes a contact portion 61 and a connecting portion 62, and the contact portion 61 is an annular structure, which has a boss 611 extending inwardly, and the contact portion is sleeved outside the static lead-out terminal 3 and the boss 611 contacts the static lead-out terminal 3 to form an electrical connection. The connecting portion 62 is used to connect with the control module 5 , so that the two conductive members 60 are electrically connected through the control module 5 , and a closed circuit is formed by the moving contact 21 and the static contact 31 being attracted.

[0043] In this example, two static lead terminals 3 are connected to the load, and the conductive member 60 is respectively connected to one static lead terminal 3 to detect whether the contact is closed. In other embodiments, if the moving contact and the static contact are respectively connected to the load through one lead terminal, the two conductive members can be respectively connected to the moving lead terminal and the static lead terminal to detect whether the contact is in the closed state.

[0044] See also Figure 1 and Figure 3 As shown, the relay further comprises a housing 7 , and the contacts, the return spring 4 and the coil part 1 are all arranged in the housing 7 . The relay is installed vertically with the help of the housing 7 .

[0045] In other embodiments, see Fig.10and Fig.11 As shown, the relay can also be a horizontal relay, which is installed horizontally with the help of the housing 7. The horizontally installed relay has the same internal structure as the vertically installed relay, but the installation direction is different, and the arrangement direction of the internal structure also changes with the installation direction. Generally, the movement direction of the moving contact part of the vertically installed relay is the vertical direction, and the movement direction of the moving contact part of the horizontally installed relay is the horizontal direction. Therefore, the structural principle of the horizontal relay is the same as that of the vertical relay, and only the arrangement direction changes accordingly, which will not be repeated here.

[0046] The contact closing and breaking process of the present invention is as follows:

[0047] After receiving the pull-in control signal, the control module 5 outputs a control voltage to the pull-in coil 11, and the contacts are pulled in; if the contact status detector 6 detects that the contacts are not pulled in, the control module 5 will repeat the output of voltage to the pull-in coil 11 three times; if the contacts are still not pulled in after three times, the control module 5 will stop outputting voltage to the pull-in coil 11 and send out a fault warning signal.

[0048] After receiving the disconnection control signal, the control module 5 stops outputting the control voltage to the pull-in coil 11, and outputs a high level of 200mS to the release coil 12. After the release coil 12 is energized, it will generate a reverse pulling force to more reliably disconnect the contacts. At the same time, if the contact status detector 6 detects that the contacts are not disconnected, the control module 5 will repeatedly output voltage to the release coil 12 three times to ensure that the contacts are reliably disconnected. If the contacts are still not disconnected after three times, the control module 5 will stop outputting voltage to the release coil 12 and send a fault warning signal.

[0049] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, those skilled in the art should understand that the remaining undescribed portions are prior art, and that various changes made to the present invention in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims shall fall within the scope of protection of the present invention.

Claims

1. A double-coil monostable relay, comprising a contact, a reset spring and a coil part, wherein the coil part is used to selectively switch on and off power to control the contact to close or open; characterized in that: The coil part includes a pull-in coil and a disconnecting coil. The pull-in coil is used to overcome the elastic force of the reset spring to drive the contacts to be pulled in when powered on and to keep the contacts powered on continuously to keep the contacts in the pulled-in state. The disconnecting coil is used to cooperate with the reset spring to drive the contacts to be disconnected when powered on, so that the relay forms a monostable operation and prevents the contacts from sticking.

2. A double-coil monostable relay according to claim 1, characterized in that: It also includes a control module, the pull-in coil and the disconnecting coil are electrically connected to the control module respectively, and the control module is used to receive a control signal and control the pull-in coil and the disconnecting coil to be energized respectively to make the contacts pull in or disconnect.

3. A double-coil monostable relay according to claim 2, characterized in that: It also includes a contact state detector electrically connected to the contact, the contact state detector is used to detect whether the contact is in an attracted state, and the contact state detector is electrically connected to the control module to feed back the contact state to the control module.

4. A double-coil monostable relay according to claim 3, characterized in that: It includes two static lead-out terminals, each of which is provided with a static contact. The contact state detector is a conductive member made of conductive material. Each of the static lead-out terminals is connected to a conductive member, and the two conductive members form a closed loop with the aid of the control module when the contacts are in the closed state.

5. A double-coil monostable relay according to claim 1, characterized in that: The contact includes a moving contact and a stationary contact, the disconnecting coil and the attracting coil are arranged along the moving direction of the moving contact, and the disconnecting coil is located in the disconnecting direction of the moving contact relative to the attracting coil.

6. A double-coil monostable relay according to claim 5, characterized in that: It also includes a moving contact part, which includes the moving contact point, a movable rod and a moving iron core. The moving contact point and the moving iron core are respectively arranged at the two ends of the movable rod. The attraction coil is provided with an attraction static iron core, and the breaking coil is provided with a breaking static iron core. The attraction static iron core and the breaking static iron core are respectively arranged at the two ends of the moving iron core, so that the attraction static iron core and the breaking static iron core respectively attract the moving iron core to make the moving contact move in the direction close to or away from the static contact, forming the attraction or breaking of the contact.

7. A double-coil monostable relay according to claim 5, characterized in that: The coil part includes a suction coil frame and a disconnecting coil frame, the suction coil is provided on the suction coil frame, and a suction yoke is provided outside the suction coil frame, the disconnecting coil is provided on the disconnecting coil frame, and a disconnecting yoke is provided outside the disconnecting coil frame; the positioning between the disconnecting coil frame and the suction coil frame is formed by plugging the disconnecting yoke into the suction coil frame, or the positioning between the disconnecting coil frame and the suction coil frame is formed by plugging the suction yoke into the disconnecting coil frame.

8. A double-coil monostable relay according to claim 7, characterized in that: The breaking yoke is provided with a plurality of connection posts extending toward the attraction coil frame, and the attraction coil frame is provided with a plurality of connection holes corresponding to the connection posts. The connection posts are inserted into the connection holes to form the connection between the breaking yoke and the attraction coil frame.

9. A double-coil monostable relay according to claim 8, characterized in that: A protrusion is provided on the side of the connecting column, and the protrusion is interference fit with the connecting hole.

10. A double-coil monostable relay according to any one of claims 1 to 9, characterized in that: The relay comprises a shell, wherein the contact, the reset spring and the coil part are all arranged in the shell, and the relay is installed horizontally or vertically by means of the shell.

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