A strong magnetic field resistant magnetic latching relay

Abstract

The present invention discloses a strong magnetic field-resistant magnetic latching relay, which includes a housing, and further includes a main wire coil, a main contact assembly, and a locking member disposed inside the housing; the main contact assembly includes a main contact static arm and a main contact moving arm, and a magnet with a preset polarity is connected to the main contact moving arm. When a magnetic force acts between the magnet and the main wire coil, the main contact moving arm is attracted to or separated from the main contact static arm; the locking member is used to lock the main contact moving arm, and the locking member has a self-unlocking function. Whether in the closing state or the opening state, when an external interfering magnetic field appears, the magnet has a tendency to drive the main contact moving arm to act, so as to destroy the original state of the main contact moving arm. However, due to the locking effect of the locking member on the main contact moving arm, the main contact moving arm cannot act. The magnetic latching relay in the present invention not only has the function of resisting strong magnetic interference, but also, since the locking member is integrated in the housing and the thickness dimension of the housing does not change, it is beneficial to the installation of the magnetic latching relay.

Description

Technical Field

[0001] The present invention relates to the field of magnetic latching relays, and more particularly to an anti-strong magnetic magnetic latching relay. Background Art

[0002] In the prior art, an anti-magnetic shell is provided outside the relay to prevent the relay from being interfered by an external magnetic field. With the improvement of the anti-magnetic requirement, the thickness of the anti-magnetic shell is getting thicker, which not only increases the product cost, but also brings inconvenience to the installation and fixation of the relay.

[0003] Therefore, how to design an anti-strong magnetic magnetic latching relay that can not only prevent the interference of the external magnetic field, but also be convenient for installation and fixation is a key problem to be solved urgently by those skilled in the art. Summary of the Invention

[0004] The object of the present invention is an anti-strong magnetic magnetic latching relay that can not only prevent the interference of the external magnetic field, but also be convenient for installation and fixation. To achieve the above object, the present invention provides the following technical solutions:

[0005] An anti-strong magnetic magnetic latching relay includes a housing, and further includes a main wire coil, a main contact assembly, and a locking member disposed in the housing;

[0006] The main contact assembly includes a main contact static arm and a main contact moving arm, and a magnet with a preset polarity is connected to the main contact moving arm. When a magnetic force acts between the magnet and the main wire coil, the main contact moving arm is attracted to or separated from the main contact static arm;

[0007] The locking member is used to lock the main contact moving arm, and the locking member has a self-unlocking function.

[0008] Preferably, it further includes a secondary wire coil and an armature, the locking member is connected to the armature, and the armature is disposed at an end close to the iron core of the secondary wire coil;

[0009] When the secondary wire coil has magnetism, under the attraction of the armature and the secondary wire coil, the locking member moves with the armature to unlock the main contact moving arm. After the secondary wire coil loses magnetism, the locking member resets to lock the main contact moving arm; the magnetic circuit direction of the main wire coil is perpendicular to the magnetic circuit direction of the secondary wire coil.

[0010] Preferably, it further includes a secondary contact assembly, the secondary contact assembly includes a secondary contact static arm and a secondary contact moving arm, and the locking member and the armature are both disposed on the secondary contact moving arm;

[0011] When the auxiliary wire coil has magnetism, under the attraction of the armature and the auxiliary wire coil, the moving arm of the auxiliary contact moves to contact the static arm of the auxiliary contact. After the auxiliary wire coil loses magnetism, the moving arm of the auxiliary contact resets and separates from the static arm of the auxiliary contact.

[0012] The moving arm of the auxiliary contact is connected to the first wire end of the main wire coil, the static arm of the auxiliary contact is connected to the first wire end of the auxiliary wire coil, the second wire end of the main wire coil is connected to the second wire end of the auxiliary wire coil, and both the first wire end and the second wire end of the auxiliary wire coil extend out of the housing.

[0013] Preferably, the moving arm of the auxiliary contact is located between the moving arm of the main contact and the auxiliary wire coil, and the end of the moving arm of the auxiliary contact is hinged to the housing. When the auxiliary wire coil has magnetism, under the attraction of the armature and the auxiliary wire coil, the moving arm of the auxiliary contact rotates to contact the static arm of the auxiliary contact. After the auxiliary wire coil loses magnetism, the moving arm of the auxiliary contact resets and separates from the static arm of the auxiliary contact.

[0014] Preferably, a slide rail is arranged inside the housing, and the locking member is fitted on the slide rail.

[0015] After the moving arm of the main contact separates from the static arm of the main contact, the locking member forms a block on the moving arm of the main contact to prevent the moving arm of the main contact from contacting the static arm of the main contact.

[0016] After the moving arm of the main contact contacts the static arm of the main contact, the locking member forms a block on the moving arm of the main contact to prevent the moving arm of the main contact from separating from the static arm of the main contact.

[0017] Preferably, the auxiliary contact assembly further includes a return spring. One end of the return spring is connected to the moving arm of the auxiliary contact, and the other end is connected to the housing. The return spring provides an elastic return force to the moving arm of the auxiliary contact to separate the moving arm of the auxiliary contact from the static arm of the auxiliary contact, and the locking member forms a locking force on the moving arm of the main contact under the thrust of the return spring.

[0018] Preferably, an arc-shaped limiting hole is arranged inside the housing, a limiting pin is connected to the moving arm of the main contact, the limiting pin penetrates through the arc-shaped limiting hole, and the inner walls at both ends of the arc-shaped limiting hole can form a blocking effect on the limiting pin.

[0019] Preferably, the ends of the iron core of the main wire coil are arranged face to face, and the magnet is located between the two ends of the iron core of the main wire coil.

[0020] As can be seen from the above technical solution: Whether in the closed state or the open state, when there is an external interfering magnetic field, the magnetic path direction of the external interfering magnetic field is the same as that of the main wire coil, and the polarity of the external interfering magnetic field is opposite to that of the main wire coil, the magnet has a tendency to drive the moving arm of the main contact to move under the action of the external interfering magnetic field, so as to destroy the original state of the moving arm of the main contact. However, due to the locking action of the locking member on the moving arm of the main contact, it cannot move. Therefore, if the moving arm of the main contact is in contact with the static arm of the main contact, then the contact is continued; if the moving arm of the main contact is in a separated state from the static arm of the main contact, then the separation is continued. The magnetic latching relay in the present invention not only has the function of preventing strong magnetic interference, but also is beneficial to the installation of the magnetic latching relay because the locking member is integrated in the housing and the thickness dimension of the housing remains unchanged. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the solutions in the embodiments of the present invention, the drawings required for description in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 FIG. is a schematic structural diagram of a strong magnetic interference-proof magnetic latching relay provided by a specific embodiment of the present invention;

[0023] Figure 2 FIG. is a flowchart from open to closed provided by a specific embodiment of the present invention.

[0024] Wherein, 1 is the armature, 2 is the moving arm of the auxiliary contact, 3 is the static arm of the auxiliary contact, 4 is the locking member, 5 is the static arm of the main contact, 6 is the moving arm of the main contact, 7 is the magnet, 8 is the auxiliary wire coil, 9 is the main wire coil, and 10 is the housing. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The present invention discloses a strong magnetic interference-proof magnetic latching relay, which can not only prevent the interference of external magnetic fields, but also be convenient for installation and fixation.

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] The present invention discloses a strong magnetic field resistant magnetic latching relay, which includes a housing 10, and further includes a main wire coil 9, a main contact assembly and a locking member 4 disposed within the housing 10. Among them, the main contact assembly includes a main contact static arm 5 and a main contact moving arm 6. A magnet 7 with a preset polarity is connected to the main contact moving arm 6. After the main wire coil 9 generates a magnetic field, a magnetic force acts between the magnet 7 and the main wire coil 9. Under the action of this magnetic force, the main contact moving arm 6 is attracted to or separated from the main contact static arm 5. The locking member 4 in the present invention is integrated within the housing 10, and the function of the locking member 4 is to lock the main contact moving arm 6, and the locking member 4 has a self-unlocking function.

[0028] During closing, first control the locking member 4 to unlock the main contact moving arm 6, and then provide a positive driving voltage to the main wire coil 9 to enable the main wire coil 9 to generate a preset magnetic field, generating a positive magnetic force on the magnet 7, thereby driving the magnet 7 to drive the main contact moving arm 6 close to the main contact static arm 5, so that the main contacts on the main contact moving arm 6 contact the main contacts on the main contact static arm 5 to conduct the circuit. After closing, the locking member 4 acts to lock the main contact moving arm 6.

[0029] During opening, first control the locking member 4 to unlock the main contact moving arm 6, and then provide a reverse driving voltage to the main wire coil 9 to enable the main wire coil 9 to generate a preset magnetic field, generating a reverse magnetic force on the magnet 7, thereby driving the magnet 7 to drive the main contact moving arm 6 away from the main contact static arm 5, so that the main contacts on the main contact moving arm 6 are separated from the main contacts on the main contact static arm 5 to disconnect the circuit. After opening, the locking member 4 acts to lock the main contact moving arm 6.

[0030] Whether in the closed state or the open state, when there is an external interfering magnetic field, the magnetic path direction of the external interfering magnetic field is the same as that of the main wire coil 9, and the polarity of the external interfering magnetic field is opposite to that of the main wire coil 9, the magnet 7 has a tendency to drive the main contact moving arm 6 to act under the action of the external interfering magnetic field to destroy the original state of the main contact moving arm 6. However, due to the locking effect of the locking member 4 on the main contact moving arm 6, it cannot act. Therefore, if the main contact moving arm 6 and the main contact static arm 5 are in a contact state, then they continue to remain in contact; if the main contact moving arm 6 and the main contact static arm 5 are in a separated state, then they continue to remain separated.

[0031] The magnetic latching relay in the present invention not only has the function of resisting strong magnetic interference, but also since the locking member 4 is integrated within the housing 10, the thickness dimension of the housing 10 remains unchanged, which is beneficial to the installation of the magnetic latching relay.

[0032] It should be noted that, in order to make the main contact arm 6 more sensitive, the iron core of the main wire coil 9 in the present invention is set to a C-shaped structure, that is, the two ends of the iron core of the main wire coil 9 are arranged face to face. The magnet 7 connected to the main contact arm 6 is located between the two ends of the iron core of the main wire coil 9. In this way, when a driving voltage is provided to the main wire coil 9, the magnet 7 will be subjected to the same-direction acting forces of the two ends of the iron core, thereby effectively ensuring the movement of the magnet 7.

[0033] The magnetic latching relay in the present invention further includes a secondary wire coil 8 and an armature 1. The locking member 4 is connected to the armature 1. The armature 1 is arranged near the end of the iron core of the secondary wire coil 8. When the iron core of the secondary wire coil 8 has magnetism, the armature 1 will be attracted by the iron core of the secondary wire coil 8, and the locking member 4 will act along with the armature 1 to unlock the main contact arm 6. After the iron core of the secondary wire coil 8 loses magnetism, the locking member 4 resets to lock the main contact arm 6. That is, the locking and unlocking of the locking member 4 can be controlled by controlling the energization and de-energization of the secondary wire coil 8.

[0034] It should be noted that, if the magnetic circuit direction of the secondary wire coil 8 is the same as that of the main wire coil 9, then when there is an external interference magnetic field with the same magnetic circuit direction as that of the main wire coil 9 and opposite polarity, then this interference magnetic field will cause the secondary wire coil 8 to generate magnetism, thereby triggering the unlocking of the locking member 4. Then, under the action of the external interference magnetic field, the main contact arm 6 will move to destroy the original state. It can be seen that, if the magnetic circuit direction of the secondary wire coil 8 is the same as that of the main wire coil 9, then under the action of the external interference magnetic field, the locking member 4 will fail, and the magnetic latching relay will be interfered.

[0035] In order to prevent the occurrence of the above situation, the present invention defines that the magnetic circuit direction of the main wire coil 9 is perpendicular to that of the secondary wire coil 8. In this way, if the magnetic circuit direction of the external interference magnetic field is the same as that of the main wire coil 9, then this external interference magnetic field is perpendicular to the magnetic circuit direction of the secondary wire coil 8, so it cannot interfere with the secondary wire coil 8, and then the locking member 4 will not fail, so that the magnetic relay can be prevented from being interfered. If the magnetic circuit direction of the external interference magnetic field is the same as that of the secondary wire coil 8, then the locking member 4 will fail, but this external interference magnetic field is perpendicular to the magnetic circuit direction of the main wire coil 9, so it cannot interfere with the main wire coil 9, and the main contact arm 6 still maintains the original state. Therefore, as long as the magnetic circuit direction of the main wire coil 9 is defined to be perpendicular to that of the secondary wire coil 8, then no matter what the magnetic circuit direction of the external interference magnetic field is, it will not interfere with both the main wire coil 9 and the secondary wire coil 8 at the same time, and then it can ensure that the main contact arm 6 maintains the original state.

[0036] It should be noted that the magnetic circuit direction of the main wire coil 9 being perpendicular to that of the secondary wire coil 8 means that the central axis around which the coil of the main wire coil 9 is wound is perpendicular to the central axis around which the coil of the secondary wire coil 8 is wound.

[0037] The present invention also provides a secondary contact assembly, which includes a secondary contact static arm 3 and a secondary contact moving arm 2. The locking member 4 and the armature 1 are both disposed on the secondary contact moving arm 2. When the secondary coil package 8 has magnetism, under the attraction of the armature 1 and the secondary coil package 8, the secondary contact moving arm 2 moves to contact the secondary contact static arm 3, and at the same time, the locking member 4 moves with the secondary contact moving arm 2 to unlock the main contact moving arm 6. After the secondary coil package 8 loses magnetism, the secondary contact moving arm 2 resets and separates from the secondary contact static arm 3, and at the same time drives the locking member 4 to reset to lock the main contact moving arm 6.

[0038] The secondary contact moving arm 2 is connected to the first wire end of the main coil package 9, and the secondary contact static arm 3 is connected to the first wire end of the secondary coil package 8. The second wire end of the main coil package 9 is connected to the second wire end of the secondary coil package 8. Moreover, both the first wire end and the second wire end of the secondary coil package 8 extend out of the housing 10 to facilitate connection of the driving voltage.

[0039] After applying a driving voltage to the secondary coil package 8, the secondary coil package 8 is energized to attract the armature 1, thereby driving the locking member 4 to move to unlock the main contact moving arm 6. At the same time, since the secondary contact moving arm 2 and the secondary contact static arm 3 are connected, the first wire end of the main coil package 9 will be connected to the first wire end of the secondary coil package 8, and then the main coil package 9 will be energized, so that the main contact moving arm 6 will move to close or open the switch. After closing or opening the switch, the driving voltage is cut off, and under the action of the restoring force, the secondary contact static arm 3 drives the locking member 4 to reset to lock the main contact moving arm 6.

[0040] The secondary coil package 8 in the present invention not only has the function of controlling the locking member 4, but also has the function of controlling the main coil package 9. Compared with the technical solution of leading out the two wire ends of the secondary coil package 8 and the two wire ends of the main coil package 9 from the housing 10 and controlling the secondary coil package 8 and the main coil package 9 according to the time sequence to achieve unlocking and locking, the technical solution of controlling the locking member 4 and the main coil package 9 through the secondary coil package 8 has a simpler control principle and is easier to implement.

[0041] Regarding the specific structure of the secondary contact moving arm 2: The secondary contact moving arm 2 is located between the main contact moving arm 6 and the secondary coil package 8. One end of the secondary contact moving arm 2 is hinged to the housing 10. After the secondary coil package 8 is energized to generate magnetism, the armature 1 will be attracted by the iron core of the secondary coil package 8, and the secondary contact moving arm 2 will rotate around the hinge portion, so that the secondary contact on the secondary contact moving arm 2 contacts the secondary contact on the secondary contact static arm 3, and at the same time drives the locking member 4 away from the main contact moving arm 6. After the secondary coil package 8 loses power, the attraction force between the armature 1 and the secondary coil package 8 disappears, and then under the action of the restoring force, the secondary contact moving arm 2 rotates towards the direction close to the main contact moving arm 6 to separate from the static contact static arm, and at the same time moves the locking member 4 to the position of the main contact moving arm 6 to form a blocking lock on the main contact moving arm 6.

[0042] To ensure the stability of the movement of the locking member 4, the present invention further provides a slide rail in the housing 10 that cooperates with the locking member 4. After the switch is turned off, that is, after the moving arm 6 of the main contact is separated from the static arm 5 of the main contact, the locking member 4 forms an obstruction to the moving arm 6 of the main contact to prevent the moving arm 6 of the main contact from contacting the static arm 5 of the main contact. After the moving arm 6 of the main contact contacts the static arm 5 of the main contact, the locking member 4 forms an obstruction to the moving arm 6 of the main contact to prevent the moving arm 6 of the main contact from separating from the static arm 5 of the main contact.

[0043] It should be noted that the locking member 4 can be set as a pin-shaped structure, that is, a locking pin.

[0044] The auxiliary contact assembly in the present invention further includes a return spring. One end of the return spring is connected to the moving arm 2 of the auxiliary contact, and the other end is connected to the housing 10. The return spring provides an elastic return force to the moving arm 2 of the auxiliary contact to separate the moving arm 2 of the auxiliary contact from the static arm 3 of the auxiliary contact.

[0045] It should be noted that the blocking force of the locking member 4 on the moving arm 6 of the main contact comes from the thrust of the return spring. Therefore, the return spring not only provides a return force but also provides a locking force.

[0046] To prevent the over-rotation of the moving arm 2 of the auxiliary contact, the present invention further provides an arc-shaped limiting hole in the housing 10 and a limiting pin on the static arm 6 of the auxiliary contact. The limiting pin penetrates through the arc-shaped limiting hole. The inner walls at both ends of the arc-shaped limiting hole form a blocking effect on the limiting pin. Therefore, the rotation range of the static arm 6 of the auxiliary contact is limited between the two ends of the arc-shaped limiting hole.

[0047] Next, in combination with the attached Figure 2 Introduce the usage process of the magnetic latching relay: In state a, the magnetic latching relay is in the off state, and the moving arm 6 of the main contact is separated from the static arm 5 of the main contact. At this time, the locking member 4 blocks below the moving arm 6 of the main contact, forming an obstruction to the moving arm 6 of the main contact to prevent the moving arm 6 of the main contact from contacting the static arm 5 of the main contact under the interference of an external interfering magnetic field to maintain the off state. If closing is required, then first provide a driving voltage with negative on the left and positive on the right to the auxiliary coil 8. As shown in state b, after the auxiliary coil 8 is energized, the armature 1 is attracted, and the moving arm 2 of the auxiliary contact drives the locking member 4 to rotate, so that the locking member 4 moves away from the moving arm 6 of the main contact, thereby unlocking the moving arm 6 of the main contact. After the moving arm 2 of the auxiliary contact contacts the static arm 3 of the auxiliary contact, the first wire end of the main coil 9 is connected to the positive pole of the driving voltage, then the main coil 9 is energized. The upper end of the iron core of the main coil 9 is an N pole, and the lower end is an S pole. Then the magnet 7 with an N pole will move downward, thereby driving the moving arm 6 of the main contact to contact the static arm 5 of the main contact to achieve closing, as shown in state c. After closing, the driving voltage is cut off, and the auxiliary coil 8 loses power. Then, under the action of the return spring, the moving arm 2 of the auxiliary contact drives the locking member 4 to reset. The locking member 4 blocks above the moving arm 6 of the main contact to prevent separation under the action of the interfering magnetic field, as shown in state d.

[0048] It should be noted that the above text describes the process from switch-off to switch-on. Then, the process from switch-on to switch-off is the process of dcba. The difference is that at the beginning, a driving voltage with positive on the left and negative on the right needs to be provided to the secondary winding 8, which will not be elaborated here.

[0049] Finally, it should also be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0050] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same and similar parts among the embodiments, reference can be made to each other.

[0051] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A magnetic latching relay against strong magnetic fields, comprising a housing, characterized in that, It further includes a main wire coil, a main contact component, and a locking member disposed inside the housing; The main contact component includes a main contact static arm and a main contact moving arm. A magnet with a preset polarity is connected to the main contact moving arm. When a magnetic force acts between the magnet and the main wire coil, the main contact moving arm is attracted to or separated from the main contact static arm; The locking member is used to lock the main contact moving arm, and the locking member has a self-unlocking function; It further includes a secondary wire coil and an armature. The locking member is connected to the armature, and the armature is disposed at an end close to the iron core of the secondary wire coil; When the secondary wire coil has magnetism, under the attraction of the armature and the secondary wire coil, the locking member moves with the armature to unlock the main contact moving arm. After the secondary wire coil loses magnetism, the locking member resets to lock the main contact moving arm; The magnetic path direction of the main wire coil is perpendicular to the magnetic path direction of the secondary wire coil; It further includes a secondary contact component. The secondary contact component includes a secondary contact static arm and a secondary contact moving arm. The locking member and the armature are both disposed on the secondary contact moving arm; When the secondary wire coil has magnetism, under the attraction of the armature and the secondary wire coil, the secondary contact moving arm moves to contact the secondary contact static arm. After the secondary wire coil loses magnetism, the secondary contact moving arm resets to separate from the secondary contact static arm; The secondary contact moving arm is connected to the first wire end of the main wire coil, the secondary contact static arm is connected to the first wire end of the secondary wire coil, the second wire end of the main wire coil is connected to the second wire end of the secondary wire coil, and both the first wire end and the second wire end of the secondary wire coil extend out of the housing.

2. The magnetic latching relay against strong magnetic field according to claim 1, wherein The secondary contact moving arm is located between the main contact moving arm and the secondary wire coil, and the end of the secondary contact moving arm is hinged to the housing; When the secondary wire coil has magnetism, under the attraction of the armature and the secondary wire coil, the secondary contact moving arm rotates to contact the secondary contact static arm; After the secondary wire coil loses magnetism, the secondary contact moving arm resets to separate from the secondary contact static arm.

3. The magnetic latching relay against strong magnetic field according to claim 2, characterized in that, A slide rail is disposed inside the housing, and the locking member is fitted on the slide rail; After the main contact moving arm is separated from the main contact static arm, the locking member forms a block on the main contact moving arm to prevent the main contact moving arm from contacting the main contact static arm; After the main contact moving arm contacts the main contact static arm, the locking member forms a block on the main contact moving arm to prevent the main contact moving arm from separating from the main contact static arm.

4. The magnetic latching relay against strong magnetic field according to claim 2, wherein The secondary contact component further includes a return spring. One end of the return spring is connected to the secondary contact moving arm, and the other end is connected to the housing. The return spring provides an elastic return force to the secondary contact moving arm to separate the secondary contact moving arm from the secondary contact static arm, and the locking member forms a locking force on the main contact moving arm under the thrust of the return spring.

5. The magnetic latching relay against strong magnetism according to claim 2, characterized in that An arc-shaped limiting hole is disposed inside the housing. A limiting pin is connected to the secondary contact moving arm, and the limiting pin passes through the arc-shaped limiting hole. The inner walls at both ends of the arc-shaped limiting hole can form a blocking effect on the limiting pin.

6. The magnetic latching relay against strong magnetic force according to claim 1, characterized in that, The end portions at both ends of the iron core of the main wire package are arranged face to face, and the magnet is located between the two end portions of the iron core of the main wire package.

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