A contactor

Abstract

This invention relates to the field of contactor technology, specifically to a contactor comprising a housing, a terminal block extending through and into the housing, and a magnetic circuit portion disposed within the housing. The terminal block is a stationary contact. The magnetic circuit portion includes a coil, a stationary iron core, a moving iron core, a push rod fixedly connected to the moving iron core, and a yoke plate. A movable spring is provided at the end of the push rod. A permanent magnet is disposed outside the gap between the moving and stationary iron cores. A magnetic guide cylinder is disposed between the yoke plate and the moving iron core. When the coil is not energized, the magnetic guide cylinder and the moving iron core have magnetic attraction surfaces, and these surfaces form a certain angle with the axial direction of the moving iron core. The magnetic lines of force emitted by the permanent magnet return to the permanent magnet via the stationary iron core, the yoke plate, the magnetic guide cylinder, and the moving iron core, forming a closed loop. This creates a magnetic attraction force on the distal end of the moving iron core, moving away from the stationary iron core. When the coil is not energized, the moving iron core is attracted by the magnetic force of the magnetic guide cylinder, preventing the moving iron core from shaking shut and maintaining the stability of the main contacts.

Description

Technical Field

[0001] This invention relates to the field of contactor technology, and more specifically to a contactor. Background Technology

[0002] The DC contactor includes a housing, a stationary contact extending through and into the housing, and a magnetic circuit portion within the housing. The magnetic circuit portion includes a coil, a moving spring, a stationary iron core and a moving iron core passing through the coil, and a push rod fixedly connected to the moving iron core. A reset elastic element is provided between the moving and stationary iron cores. The moving spring is located at the end of the push rod and is made of conductive material. When the coil is not energized, the moving and stationary iron cores maintain a certain gap under the action of the reset elastic element, and the moving spring remains open to the stationary contact under the action of the push rod. When the coil is energized, an electromagnetic attraction is generated between the moving and stationary iron cores. The moving iron core overcomes the elastic force of the reset elastic element and attracts the stationary iron core. The push rod and the moving spring move with the moving iron core, thereby closing the moving spring to the stationary contact. As operating environments become increasingly complex, under harsh vibration conditions and when the coil is not energized, the push rod section must provide contact pressure to the normally closed contacts of multiple auxiliary contacts. The moving iron core, bearing only the spring force of the reset elastic element, will vibrate, leading to vibration failure of both the main and auxiliary contacts. This vibration affecting the closure of the main contacts under de-energized conditions is called "jitter-closed." To overcome this defect, the spring force of the reset elastic element is usually designed to be large to ensure a large initial return force, thus ensuring that the contact state remains unchanged. However, a large initial return force would cause the contactor to fail to operate when energized or require a higher operating voltage, increasing coil power consumption; therefore, this solution is not feasible. Summary of the Invention

[0003] The present invention aims to provide a contactor to solve the aforementioned problem of the moving iron core shaking shutting off when the coil is not energized.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows: a contactor, comprising a housing, a stationary contact disposed on the housing, and a magnetic circuit portion disposed within the housing. The magnetic circuit portion comprises a coil, a stationary iron core and a moving iron core disposed within the coil, a push rod passing through the center of the stationary iron core and the moving iron core and fixedly connected to the moving iron core, a moving spring plate being provided at the end of the push rod, a moving contact plate being provided on the moving spring plate, the end of the moving iron core and the stationary iron core closer to each other being the proximal end, and the end opposite to the proximal end being the distal end, a first reset elastic element being provided between the proximal ends of the moving iron core and the stationary iron core, and a yoke plate being made of a magnetically conductive material;

[0005] When the coil is not energized, under the action of the first reset elastic element, the near ends of the moving iron core and the stationary iron core maintain a certain distance, and the moving spring is disconnected from the stationary contact; when the coil is energized, the moving iron core moves axially and attracts the stationary iron core, and the moving contact closes with the stationary contact.

[0006] A permanent magnet is provided on the outer side of the near-end gap between the moving iron core and the stationary iron core, and a magnetic guide cylinder is provided at the far end of the moving iron core. When the coil is not energized, there are opposing magnetic attraction surfaces between the magnetic guide cylinder and the moving iron core. The magnetic attraction surfaces have a certain angle with the axial direction of the moving iron core. The magnetic field generated by the permanent magnet causes the magnetic guide cylinder to form a magnetic attraction force away from the stationary iron core at the far end of the moving iron core. The angle formed between the magnetic attraction surfaces and the axial direction of the moving iron core gives the magnetic attraction force of the magnetic attraction surfaces a component in the axial direction of the moving iron core, so as to prevent the moving iron core from shaking shut when the coil is not energized.

[0007] Since the moving iron core moves along its axial direction, when the coil is not energized, the component of the magnetic attraction force in the axial direction of the moving iron core and the elastic force of the first reset elastic element work together to move the moving iron core away from the stationary iron core, thereby preventing the moving iron core from shaking and maintaining the stability of the main contacts.

[0008] In one embodiment, the magnetic cylinder and the moving iron core are arranged coaxially. When the coil is not energized, the magnetic attraction surface of the magnetic cylinder that forms a magnetic attraction with the moving iron core is the end face of the magnetic cylinder, and the magnetic attraction surface of the moving iron core that forms a magnetic attraction with the magnetic cylinder is the end face of the far end of the moving iron core, so that the magnetic attraction surface is perpendicular to the axial direction of the moving iron core. The magnetic lines of force emitted by the permanent magnet pass through the magnetic attraction surfaces of the magnetic cylinder and the moving iron core respectively, thereby forming a magnetic attraction force along the axial direction of the moving iron core between the magnetic cylinder and the moving iron core.

[0009] The magnetic cylinder and the moving iron core use their end faces as magnetic attraction surfaces. The magnetic cylinder forms a magnetic attraction with the far end of the moving iron core, creating a magnetic attraction force along the axial direction from the near end to the far end. The moving iron core moves along the axial direction from the far end to the near end, so that the direction of the magnetic attraction force is opposite to the direction of the moving iron core's movement. This creates a force on the moving iron core that moves away from the stationary iron core, which helps maintain the stability of the moving iron core.

[0010] In one embodiment, the magnetic cylinder and the moving iron core are arranged coaxially. When the coil is not excited, the magnetic attraction surface of the magnetic cylinder that forms a magnetic attraction with the moving iron core is the end face of the magnetic cylinder. The moving iron core is a hollow straight cylinder with a diameter abrupt change point between its middle part and its far end, thereby forming a radially protruding step at the diameter abrupt change point. The step or end face of the moving iron core is the magnetic attraction surface that forms a magnetic attraction with the magnetic cylinder. The magnetic lines of force emitted by the permanent magnet pass through the magnetic attraction surfaces of the magnetic cylinder and the moving iron core respectively, thereby forming a magnetic attraction force along the axial direction of the moving iron core between the magnetic cylinder and the moving iron core.

[0011] Setting a step in the moving iron core is equivalent to dividing the original end face in two, reducing the magnetic attraction area between the magnetic cylinder and the moving iron core. Under the condition that the magnetic field remains unchanged, the magnetic attraction between the two can be reduced, thereby reducing the starting voltage of the coil.

[0012] In one embodiment, the magnetic cylinder and the moving iron core are arranged coaxially. The magnetic attraction surface of the moving iron core that forms a magnetic attraction with the magnetic cylinder is the end face of the far end of the moving iron core. The magnetic cylinder is a hollow straight cylinder with a diameter abrupt change point between its middle and end, thereby forming a radially protruding step at the diameter abrupt change point. The step or end face of the magnetic cylinder is the magnetic attraction surface that forms a magnetic attraction with the moving iron core. The magnetic lines of force emitted by the permanent magnet pass through the magnetic attraction surfaces of the magnetic cylinder and the moving iron core respectively, thereby forming a magnetic attraction force along the axial direction of the moving iron core between the magnetic cylinder and the moving iron core.

[0013] Since the moving iron core is connected to a push rod and is movable, if the structure of the moving iron core is changed, the impact on the movement of the push rod and the moving iron core should be considered. The space for change is small. However, the magnetic cylinder is fixed and has fewer parts connected to it. Changing its structure has a smaller impact on the overall structure. Therefore, setting steps on the magnetic cylinder makes it easier to operate.

[0014] In one embodiment, the magnetic cylinder and the moving iron core abut against each other, such that the magnetic attraction surface of the magnetic cylinder is the contact surface between it and the moving iron core, and the magnetic attraction surface of the moving iron core is the contact surface between it and the magnetic cylinder.

[0015] The smaller the gap between the magnetic cylinder and the moving iron core, the smaller the magnetic resistance between them, and the greater the magnetic attraction force generated, which is beneficial to maintaining the stability of the moving iron core.

[0016] In one embodiment, the magnetic cylinder has a first sleeve structure in the direction near the moving iron core, and the moving iron core has a second sleeve structure in the direction near the magnetic cylinder. The first sleeve structure and the second sleeve structure are sleeved together to form a sleeve connection between the magnetic cylinder and the moving iron core.

[0017] The magnetic cylinder and the moving iron core are connected by a sleeve. During installation, the first and second sleeve structures can guide the magnetic cylinder and the moving iron core, making the installation simpler.

[0018] In one embodiment, the first sleeve structure is a first sleeve portion extending axially from the end of the magnetic cylinder near the moving iron core, so the magnetic cylinder includes a first main body and a first sleeve portion. The second sleeve structure is a second sleeve portion extending axially from the distal end of the moving iron core, so the moving iron core includes a second main body and a second sleeve portion. The surface of the first sleeve portion for engaging with the second sleeve portion is a first sleeve surface, and the surface of the second sleeve portion facing the first sleeve surface is a second sleeve surface. The extending directions of the first sleeve surface and the second sleeve surface are parallel to the movement direction of the moving iron core. When the coil is energized, the lengths of the first sleeve portion and the second sleeve portion ensure that the magnetic cylinder and the moving iron core are always engaged, so that the magnetic lines of force emitted by the energized coil pass through the first sleeve surface and the second sleeve surface, causing the magnetic field generated by the energized coil to act on the moving iron core.

[0019] When the coil is energized, as the moving iron core moves toward the stationary iron core, the distance between the moving iron core and the magnetic cylinder increases, which increases the magnetic resistance between them. In order to maintain the movement of the moving iron core, the coil power consumption needs to be increased. The first and second sockets can maintain a small distance between the magnetic cylinder and the moving iron core, avoiding the increase in coil power consumption caused by the increase in magnetic resistance.

[0020] In one embodiment, the first socket surface and the first main body have a first connecting surface, and the second socket surface and the second main body have a second connecting surface; the magnetic cylinder and the moving iron core form at least one set of magnetic attraction surfaces. When the first socket surface and the moving iron core form a magnetic attraction, the end face of the first socket surface and the second connecting surface of the moving iron core form a set of magnetic attraction surfaces; when the second socket surface and the magnetic cylinder form a magnetic attraction, the end face of the second socket surface and the first connecting surface of the magnetic cylinder form a set of magnetic attraction surfaces.

[0021] The first and second connection structures are formed by extending from the magnetic cylinder and the moving iron core, respectively. Therefore, both are magnetically conductive structures, and at least one set of magnetic attraction surfaces is set between the moving iron core and the magnetic cylinder, realizing the combination of magnetic attraction and guidance.

[0022] In one embodiment, the first socket is sleeved on the outside of the second socket, the inner diameter of the first socket is greater than or equal to the inner diameter of the first main body, the outer diameter of the second socket is less than or equal to the outer diameter of the second main body, the inner side of the first socket forms a first socket surface, and the outer side of the second socket forms a second socket surface.

[0023] In one embodiment, the first socket is fitted inside the second socket, the outer diameter of the first socket is less than or equal to the outer diameter of the first main body, the inner diameter of the second socket is greater than or equal to the inner diameter of the second main body, the outer side of the first socket forms a first socket surface, and the inner side of the second socket forms a second socket surface.

[0024] In one embodiment, the device further includes a terminal threaded through the housing and extending into the housing, the end of which is the stationary contact. The extension direction of the terminal thread is perpendicular to the extension direction of the push rod, and the stationary contact and the moving contact are arranged opposite to each other.

[0025] The push rod and the terminal extend perpendicularly, allowing the push rod to be placed horizontally, reducing the contact height. Both the stationary contact and the moving spring are located at one end of the push rod, and the stationary contact and the moving spring are on the same end of the push rod. Therefore, the movement of the push rod can directly push the moving spring to contact the stationary contact, eliminating the need for a connecting piece between the moving spring and the push rod, improving the control accuracy of the moving spring, and simplifying the structure.

[0026] In one embodiment, the magnetic cylinder is a hollow straight cylinder with both ends open, and the end of the push rod away from the moving spring extends out of the magnetic cylinder through both ends.

[0027] The push rod passes through the magnetic cylinder and extends outside the magnetic cylinder, leaving space for the end of the push rod away from the moving spring to connect with other parts, thereby forming a connection relationship between the other parts and the moving iron core.

[0028] In one embodiment, the end of the push rod away from the moving spring is connected to the second reset elastic element. When the coil is energized, the push rod squeezes the second reset elastic element, causing the second reset elastic element to deform. The second reset elastic element applies a spring force to the push rod, causing the push rod to return to its original position.

[0029] When the coil is energized, the push rod is subjected to a spring force that causes it to return to its original position. When the coil is switched from being energized to being de-energized, the second reset elastic element accelerates the push rod's return to its original position, thereby helping the moving iron core and the stationary iron core to separate and speeding up the contactor's de-energization response time.

[0030] In one embodiment, a magnetic shielding component made of non-ferromagnetic material is provided between the moving iron core and the stationary iron core. When the coil is energized, the near-end faces of both the moving iron core and the stationary iron core abut against the magnetic shielding component.

[0031] Since the magnetic shielding component is non-magnetic, it can reduce the magnetic attraction between the moving iron core and the stationary iron core. When the coil switches from being energized to being de-energized, it helps the moving iron core and the stationary iron core to separate, thus speeding up the de-energization response time of the contactor.

[0032] The present invention has the following beneficial effects:

[0033] 1. By using a permanent magnet placed between the moving iron core and the stationary iron core, and a magnetic cylinder placed between the yoke plate and the moving iron core, a magnetic field circuit is formed between the permanent magnet, the stationary iron core, the yoke plate, the magnetic cylinder, the moving iron core, and the permanent magnet when the coil is de-energized and not excited. The magnetic attraction surfaces of the magnetic cylinder and the moving iron core have a certain angle with the direction of movement of the moving iron core. Therefore, the magnetic field generated by the permanent magnet forms a magnetic attraction force on the moving iron core that moves away from the stationary iron core, thereby keeping the moving iron core in a position away from the stationary iron core and preventing the moving iron core from shaking off when the power is off.

[0034] 2. Since the magnetic cylinder is a hollow straight cylinder with both ends open, the push rod inserted inside can extend to both ends. Since the main contact is set at one end of the push rod, an auxiliary contact can be set at the other end according to the load requirements during use, which can increase the number of contacts to accommodate loads that require multiple sets of contacts to control simultaneously.

[0035] 3. The magnetic cylinder and the moving iron core are equipped with matching sleeves, which not only ensure contact stability when the power is off, but also further optimize the function of saving coil power consumption when the power is on, and better form a magnetic circuit. Attached Figure Description

[0036] Figure 1 This is a perspective view of an embodiment of the present invention;

[0037] Figure 2 This is a perspective view of the internal structure of an embodiment of the present invention;

[0038] Figure 3 This is a top view of the internal structure of an embodiment of the present invention;

[0039] Figure 4 This is a cross-sectional view (AA) of an embodiment of the present invention;

[0040] Figure 5 This is a cross-sectional view (AA) of another embodiment of the present invention;

[0041] Figure 6 This is a schematic cross-sectional view of the moving iron core and magnetic cylinder in another embodiment. Figure 1 ;

[0042] Figure 7 This is a schematic cross-sectional view of the moving iron core and magnetic cylinder in another embodiment. Figure 2 ;

[0043] Figure 8 This is a schematic cross-sectional view of the moving iron core and magnetic cylinder in another embodiment. Figure 3 ;

[0044] Figure 9 This is a schematic cross-sectional view of the moving iron core and magnetic cylinder in another embodiment. Figure 4 ;

[0045] Figure 10 This is a schematic cross-sectional view of the moving iron core and magnetic cylinder in another embodiment. Figure 5 ;

[0046] Figure 11 This is a schematic cross-sectional view of the moving iron core and magnetic cylinder in another embodiment. Figure 6 ;

[0047] Figure 12 This is a schematic cross-sectional view of the moving iron core and magnetic cylinder in another embodiment. Figure 7 ;

[0048] Figure 13 This is a schematic cross-sectional view of the moving iron core and magnetic cylinder in another embodiment. Figure 8 ;

[0049] Figure 14 This is a schematic cross-sectional view of the moving iron core and magnetic cylinder in another embodiment. Figure 9 ;

[0050] Figure 15 This is a schematic cross-sectional view of the moving iron core and magnetic cylinder in another embodiment. Figure 10 ;

[0051] Figure 16This is a schematic cross-sectional view of the moving iron core and magnetic cylinder in another embodiment. Figure 10 one;

[0052] Figure 17 yes Figure 5 A magnified view of a portion of the image, E;

[0053] The components include: 1. Housing; 2. Terminal; 21. Stationary contact; 31. Coil; 32. Stationary iron core; 33. Moving iron core; 331. Second step; 332. Second socket; 333. Second main body; 34. Push rod; 341. Pushing component; 35. Yoke plate; 351. U-shaped yoke; 352. Flat yoke; 36. Moving spring; 37. First reset elastic component; 38. Permanent magnet; 39. Magnetic cylinder; 391. First step; 392. First socket; 393. First main body; 4. Magnetic shielding component; 5. Reaction spring. Detailed Implementation

[0054] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention, primarily used to illustrate the embodiments and to explain the operating principles of the embodiments in conjunction with the relevant descriptions in the specification. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0055] See Figure 1-4As shown, as an embodiment of the present invention, a contactor is provided, including a housing 1, a terminal 2 passing through the housing 1 and extending into the housing 1, the end of the terminal 2 located inside the housing 1 being a stationary contact 21, and a magnetic circuit portion disposed within the housing 1. The magnetic circuit portion includes a coil 31, a stationary iron core 32 and a moving iron core 33 disposed within the coil 31, a push rod 34 passing through the center of the stationary iron core 32 and the moving iron core 33 and fixedly connected to the moving iron core 33, and a yoke plate 35. The push rod 34 has a movable spring 36 at its end. The movable spring 36 has a certain gap with the stationary contact 21. The surface of the movable spring 36 opposite to the stationary contact has a movable contact. The movable contact corresponds to the stationary contact. The stationary contact 21 is fixedly connected to the housing 1 and is located at the end of the push rod 34 with the movable spring 36. The movable spring 36 switches positions as the coil is energized and de-energized. Since the movable spring 36 and the stationary contact 21 are located at the same end of the push rod 34, the push rod movement can directly push the movable spring close to the stationary contact so that the movable contact contacts the stationary contact. There is no need to add a connecting piece between the movable spring and the push rod, which improves the control accuracy of the movable spring and simplifies the structure. In this example, there are two stationary contacts 21, each connected to an external load via a terminal 2. When the moving contact 21 on the moving spring 36 and the stationary contact 21 are closed, the two stationary contacts 21 are connected; when the moving contact 21 and the stationary contact 21 are open, the connection between the two stationary contacts 21 is broken. The extension direction of the terminal 2 of the stationary contact 21 is perpendicular to the extension direction of the push rod 34. Since the terminal 2 extends longitudinally in this example, the push rod 34 extends laterally. The lateral extension of the push rod 34, relative to both the terminal 2 and the terminal 34, reduces the height of the contactor. The end of the moving iron core 33 and the stationary iron core 32 closest to each other is the proximal end, and the end opposite the proximal end is the distal end. A first reset elastic element 37 is provided between the proximal ends of the moving iron core 33 and the stationary iron core 32; in this example, the first reset elastic element 37 is a spring. When the coil 31 is not energized, under the action of the first reset elastic element 37, the near ends of the moving iron core 33 and the stationary iron core 32 maintain a certain distance, and the moving spring 36 is disconnected from the stationary contact 21 under the action of the push rod 34 and the moving iron core 33. When the coil 31 is energized, the moving iron core 33 moves axially and attracts the stationary iron core 32. The push rod 34 and the moving spring 36 switch to the position of contacting the stationary contact 21 as the moving iron core 33 moves, and at this time the two stationary contacts 21 are connected. The yoke plate 35 is made of magnetically conductive material. The yoke plate 35 includes a U-shaped yoke 351 and a flat yoke 352, which together form a square frame yoke plate 35 with four sides: top, bottom, left, and right. The yoke plate 35 encloses the coil 31, the stationary iron core 32, and the moving iron core 33. In the direction shown in the figure, the left and right sides of the yoke plate 35 are parallel to the axial direction of the coil 31, and the top and bottom sides of the yoke plate 35 correspond to the end faces of the coil 31. The top and bottom sides of the yoke plate 35 are respectively connected to the far ends of the stationary iron core 32 and the moving iron core 33.

[0056] A ring-shaped permanent magnet 38 is provided on the outer side of the near-end gap between the moving iron core 33 and the stationary iron core 32. A magnetic guide cylinder 39 is provided between the yoke plate 35 and the far end of the moving iron core 33. Both the magnetic guide cylinder 39 and the moving iron core 33 are hollow straight cylinders, and the magnetic guide cylinder 39 and the moving iron core 33 abut against each other. When the coil 31 is not excited, the magnetic lines of force emitted by the permanent magnet have two selectable conduction paths. (See reference...) Figure 4 As shown by the closed dotted lines, the paths are: Path 1: Permanent magnet 38 - stationary iron core 32 - moving iron core 33 - permanent magnet 38; Path 2: Permanent magnet 38 - stationary iron core 32 - yoke plate 35 - magnetic cylinder 39 - moving iron core 33 - permanent magnet 38. However, according to the principle of minimum magnetic reluctance (magnetic flux always closes along the path of least magnetic reluctance), the air gap in Path 1 is relatively large, resulting in higher magnetic reluctance. Therefore, the magnetic flux of permanent magnet 38 will choose Path 2 to conduct, causing the magnetic cylinder and the moving iron core to attract each other. Since the magnetic cylinder is fixed, the moving iron core will tend to move towards the magnetic cylinder, thus creating an attractive force F between the magnetic cylinder and the moving iron core, moving away from the stationary iron core. 磁1 At this time, the elastic force F of the first reset elastic element 弹 And magnetic attraction F 磁1 With the same direction, both act together on the moving iron core, making it less prone to shut-off (if the moving iron core is pressed down by increasing the spring force to prevent shut-off, the power consumption of the coil will increase when energized). In this embodiment, the magnetic resistance between path one and path two is adjusted by an air gap. In other embodiments, since different magnetic materials have different magnetic properties, the magnetic resistance between path one and path two can also be adjusted by selecting different magnetic materials, or by combining the magnetic material with the air gap. Since the magnetic lines of force of the permanent magnet are closed along path one, the opposing surfaces between the moving iron core 33 and the magnetic cylinder 39 are their magnetic attraction surfaces. Furthermore, since the moving iron core 33 moves along its axial direction, to prevent shut-off, the magnetic attraction force between the moving iron core 33 and the magnetic cylinder 39 should have a certain component in the axial direction of the moving iron core 33 to prevent shut-off when the coil is not energized. Therefore, the magnetic attraction surface should have a certain angle with the axial direction of the moving iron core.

[0057] In this embodiment, the magnetic cylinder 39 and the moving iron core 33 are arranged coaxially, and the end face of the magnetic cylinder 39 abuts against the far end face of the moving iron core 33. The contact surface where the magnetic cylinder 39 and the moving iron core 33 abut against each other is a magnetic attraction surface. In other embodiments, the magnetic attraction surface can have a certain distance, as long as it ensures that a magnetic attraction force away from the stationary iron core 32 can be formed between the magnetic cylinder 39 and the moving iron core 33 when the coil is not excited. The contact surfaces of the magnetic cylinder and the moving iron core are their end faces, so the contact surfaces are perpendicular to the axial direction of the moving iron core. When energized, the moving iron core moves axially from the far end to the near end. The end faces of the magnetic cylinder 39 and the moving iron core 33 are perpendicular to the direction of movement of the moving iron core 33. The magnetic attraction force F formed by the magnetic lines of force passing through the end faces... 磁1It is along the axial direction of the moving iron core from the near end to the far end. That is to say, the direction of the magnetic attraction force on the moving iron core is opposite to the direction of motion, thus the magnetic attraction force F 磁1 It causes the moving iron core to move away from the stationary iron core, making it less likely for the moving iron core to close under vibration conditions, thereby maintaining contact stability and improving the reliability of contact operation.

[0058] When the coil is not energized, the force F1 exerted by the moving iron core 33, which is away from the stationary iron core, is the elastic force of the first reset elastic element and the magnetic attraction force F under the action of the permanent magnet ring 38. 磁1 The resultant force, i.e., F1 = F 弹 +F 磁1 When the coil is energized, the magnetic force F generated by the coil... 磁2 To overcome the combined force F1 of the elastic force and magnetic attraction of the first reset elastic element, and with the first reset elastic element remaining unchanged, reducing coil power consumption can only be achieved by reducing the axial magnetic attraction F between the magnetic cylinder and the moving iron core. 磁1 Size.

[0059] Reduce the axial magnetic attraction F between the magnetic cylinder and the moving iron core. 磁1 The size can be adjusted by changing the magnetic attraction force F 磁1 The angle between the axis and the axial direction is achieved. See also Figure 6 As shown, in other embodiments, the contact surface between the magnetic cylinder 39 and the moving iron core 33 forms an angle greater than 0 degrees and less than 90 degrees with the axial direction of the moving iron core. At this angle, the magnetic attraction force forms a certain angle with the axial direction of the moving iron core 33. The magnetic attraction force can be decomposed into a component force along the axial direction of the moving iron core and a component force perpendicular to the axial direction of the moving iron core. The component force along the axial direction of the moving iron core has the effect of moving the iron core away from the stationary iron core, and the magnetic lines of force emitted by the permanent magnet can also maintain the stability of the contact point. The larger the angle, the greater the effect on maintaining the stability of the contact point. Therefore, the magnetic attraction force F in the axial direction can be controlled by controlling the angle between the contact surface and the axial direction of the moving iron core. 磁1 The size of the coil is adjusted to reduce its power consumption. Furthermore, since the magnetic cylinder and the moving iron core are coaxially arranged hollow straight cylinders, when their contact surfaces have a certain angle with the axial direction, the contact surfaces can act as a guiding surface, which helps in the assembly and positioning of the magnetic cylinder and the moving iron core.

[0060] Reduce the axial magnetic attraction F between the magnetic cylinder and the moving iron core. 磁1The size can be reduced by decreasing the contact area, preferably by reducing the relative area in the direction perpendicular to the direction of movement of the moving iron core. To minimize the impact on other parts of the contactor, the overall dimensions of the moving iron core 33 and the magnetic cylinder 39 cannot be changed, so it is difficult to reduce the contact area by decreasing the outer diameter of the moving iron core 33 and the magnetic cylinder 39. Therefore, the local dimensions of the moving iron core 33 and the magnetic cylinder 39, or one of them, can be changed by setting a step with a diameter abrupt change at the end of the moving iron core 33 and the magnetic cylinder 39, or only at one of the moving iron core 33 and the magnetic cylinder 39, to reduce the area of ​​the end face, thereby reducing the contact area. Since the step is formed by a diameter abrupt change, the step and the end face are parallel; besides end face contact, choosing a step as the contact surface is also feasible. Several embodiments of reducing the contact area by setting a step at the end are listed below:

[0061] See Figure 5 As shown, the inner diameter of the middle part of the magnetic cylinder 39 is smaller than the inner diameter of the end part, and the middle part of the magnetic cylinder 39 has a sudden change point in the inner diameter, thus forming an inwardly protruding first step 391 inside the magnetic cylinder 39. The moving iron core 33 is inserted into the magnetic cylinder 39, and its end face abuts against the first step 391 of the magnetic cylinder 39. At this time, the contact surfaces are the first step 391 of the magnetic cylinder 39 and the end face of the moving iron core 33, respectively. In order for the moving iron core 33 to be better inserted into the magnetic cylinder 39 and cooperate with the first step 391, a part of the outer peripheral surface of the moving iron core 33 is cut off, so that the outer diameter of the part of the moving iron core 33 that cooperates with the magnetic cylinder 39 corresponds to the inner diameter of the end of the magnetic cylinder 39. This structure can divide the original end face into two, changing the contact between the complete end face and the end face to the contact between the step and the end face, thereby reducing the contact area. Under the premise of the same magnetic field strength, the smaller the contact area, the stronger the magnetic attraction force F. 磁1 The smaller the magnetic attraction force, the less the magnetic attraction force is on the basis of ensuring the stability of the moving iron core, thereby reducing the force F1 on the moving iron core 33 and thus reducing the power consumption of the coil.

[0062] Since the magnetic cylinder 39 has a first step 391 that reduces the area of ​​its end face, using the end face of the magnetic cylinder as the contact surface with the moving iron core can also reduce the contact area and thus reduce the magnetic attraction force F. 磁1 The function of the magnetic cylinder is that when the end face of the magnetic cylinder is used as the contact surface, the moving iron core 33 can be equipped with a second step 331 or the original structure can remain unchanged. Figure 7 , Figure 8 If a second step 331 is provided, the end of the moving iron core 33 is inserted into the magnetic guide cylinder until the second step 331 of the moving iron core 33 contacts the end face of the magnetic guide cylinder 39. Figure 7 If the original structure remains unchanged, the moving iron core 33 can simply abut against the end face of the magnetic cylinder 39. Figure 8 ).

[0063] In addition to the aforementioned method of setting a step on the inner side of the magnetic cylinder, a step can also be set on the outer side of the magnetic cylinder to reduce the contact area between the magnetic cylinder 39 and the moving iron core 33. In this case, the outer diameter of the end of the magnetic cylinder is smaller than the outer diameter of the middle part, and the middle part of the magnetic cylinder 39 has a sudden change point in outer diameter, forming a first step 391 at the sudden change point. A second step 331 can be correspondingly set on the moving iron core. Figure 9 , Figure 10 It is also possible to maintain its original structure. Figure 11 When the moving iron core is provided with a second step 331, the second step 331 of the moving iron core 33 is located on the inner side, and the second step 331 of the moving iron core and the end face of the magnetic cylinder 39 can be selected as the contact surface. Figure 9 Alternatively, the end face of the moving iron core and the 39-step magnetic cylinder can be selected as the contact surface. Figure 10 ).

[0064] In addition to setting a step in the magnetic cylinder as described above, a second step 331 can also be set only in the moving iron core while the structure of the magnetic cylinder remains unchanged. The second step 331 of the moving iron core can be set on the inner side. Figure 12 It can also be set on the outside.

[0065] It should be noted that, for both the moving iron core 33 and the magnetic cylinder 39, the step only needs to be set to be parallel to the end face when the stepped surface is used as the contact surface. In other cases, the step is not restricted to being parallel to the end face.

[0066] See Figure 5 As shown, to simplify the assembly between the magnetic cylinder 39 and the moving iron core 33, a first sleeve structure is provided on the magnetic cylinder 39 near the moving iron core 33, and a second sleeve structure is provided on the moving iron core 33 near the magnetic cylinder 39. The first and second sleeve structures are sleeved together to form a sleeved connection between the magnetic cylinder 39 and the moving iron core 33. A first sleeve portion 392 is provided between the first step 391 of the magnetic cylinder 39 and its end, thus dividing the magnetic cylinder 39 into a first sleeve portion 392 and a first main body portion 393. The first main body portion 393 is formed between the first step 391 and the end face of the magnetic cylinder 39 away from the moving iron core. An inwardly inclined slope is provided on the outer surface of the moving iron core 33. A second sleeve portion 332 is provided between the slope and the end of the moving iron core 33, thus dividing the moving iron core 33 into a second sleeve portion 332 and a second main body portion 333. The second main body portion 333 is formed between the slope and the end face of the moving iron core near its end. The first socket 392 and the second socket 332 are fitted together to form a sleeved connection between the magnetic cylinder 39 and the moving iron core 33, thereby forming a first sleeve structure with the first socket 392 and a second sleeve structure with the second socket 332. The sleeved connection between the magnetic cylinder 39 and the moving iron core 33 provides guidance for the assembly between them, thus simplifying the installation of the magnetic cylinder 39 and the moving iron core 33.

[0067] Continue reading Figure 5 As shown, the surfaces of the first socket 392 and the second socket 332 that are interlocked are the first socket surface and the second socket surface, respectively. The first socket surface and the second socket surface are parallel and both are parallel to the direction of movement of the moving iron core 33. This ensures that the distance between the first socket surface and the second socket surface remains unchanged when the moving iron core 33 moves under the action of the energized coil. The lengths of the first socket 392 and the second socket 332 ensure that the magnetic cylinder 39 and the moving iron core 33 remain interlocked when the moving iron core moves. Figure 4 In the scheme shown where the magnetic cylinder 39 and the moving iron core 33 are in contact at their ends, when the coil is energized, the magnetic lines of force emitted by the coil pass through the magnetic cylinder 39 and the moving iron core 33. As the moving iron core 33 moves towards the stationary iron core 32, the distance between the magnetic cylinder 39 and the moving iron core 33 increases, causing the magnetic resistance between them to increase. To maintain the movement of the moving iron core 33, the power consumption of the coil increases accordingly. The first socket 392 and the second socket 332 provide an axially overlapping intersection section between the magnetic cylinder 39 and the moving iron core 33. During the movement of the moving iron core 33, the magnetic cylinder 39 and the moving iron core 33 remain in contact. The magnetic lines of force emitted by the energized coil pass through the first socket surface and the second socket surface, and then through the moving iron core 33, the stationary iron core 32, the yoke plate 35, and the magnetic cylinder 39 to form a closed loop. The magnetic resistance between the magnetic cylinder 39 and the moving iron core 33 remains unchanged, and the power consumption of the coil does not need to increase as a result.

[0068] Continue reading Figure 5 As shown, there is an inclined surface between the second main body 333 and the second sleeve 332 of the moving iron core 33. This inclined surface is the second connecting surface connecting the second main body 333 and the second sleeve 332. There is a stepped surface between the first main body 393 and the first sleeve 392 of the magnetic cylinder 39. This stepped surface is the first connecting surface connecting the first connecting part 392 and the first main body 393. Thus, the connecting surface can be either a plane or an inclined surface.

[0069] As long as the first socket 392 and the second socket 332 form a socket connection, the first socket 392 can be socketed outside the second socket 332. Figure 5 , Figure 7 , Figure 14 , Figure 16 The inner surface of the first socket 392 forms a first socket surface 393, and the outer surface of the second socket 332 forms a second socket surface 333. Alternatively, the first socket 392 can be fitted inside the second socket 332. Figure 9 , Figure 10 , Figure 13 , Figure 15The inner surface of the first socket 392 forms a first socket surface 393, and the outer surface of the second socket 332 forms a second socket surface 333. The first socket 392 and the second socket 332 are respectively formed by axial extensions from the magnetic cylinder 39 and the moving iron core 33, so both the first socket 392 and the second socket 332 are magnetically conductive. When the coil is de-energized, the magnetically conductive first socket 392 and the second socket 332 engage, and the magnetic field generated by the permanent magnet 38 forms a magnetic attraction between the first socket 392 and the second socket 332, thereby causing the moving iron core 33 and the magnetic cylinder 39 to magnetically attract each other. In other words, the first socket 392 and the second socket 332 not only engage the magnetic cylinder 39 and the moving iron core 33, but also create a magnetic attraction between the moving iron core 33 and the magnetic cylinder 39.

[0070] The structure of the first socket 392 and the second socket 332 is described in detail below with reference to the accompanying drawings:

[0071] See Figure 5 As shown, the first socket 392 is fitted over the second socket 332. The first socket 392 is a protruding ring at the end of the first main body 393, and its outer diameter is equal to that of the first main body 393, meaning the outer surface of the first socket 392 coincides with the outer surface of the first main body 393. The first connecting surface is the end face of the first main body 393. The second socket 392 is a protruding ring at the end of the second main body 333, and its outer diameter is smaller than that of the second main body 333. A second connecting surface, which is not parallel to the axial direction of the moving iron core, is formed between the outer surface of the second socket 332 and the outer surface of the second main body 333. The length of the first socket 392 is less than the length of the second socket 332, therefore the first connecting surface abuts against the end face of the second socket 332 to form a magnetic attraction, meaning the first connecting surface and the end face of the second socket are magnetic attraction surfaces. This structure allows for changes to the structure of the moving iron core 33 and the magnetic cylinder 39 without altering the existing contactor structure and dimensions, and also features the functions of connecting and reducing magnetic attraction.

[0072] See Figure 7 As shown, the first socket 392 is fitted outside the second socket 332, and... Figure 5 The difference lies in that the length of the first socket 392 is greater than the length of the second socket 332, and the second connecting surface is a plane parallel to the end face of the second socket 332. In this case, the second connecting surface abuts against the end face of the first socket to form a magnetic attraction; that is, the second connecting surface and the end face of the first socket are magnetic attraction surfaces. In other embodiments, if the lengths of the first socket 392 and the second socket 332 are equal, then the first connecting surface and the end faces of the second socket, as well as the second connecting surface and the end face of the first socket, respectively abut against each other. In this case, the moving iron core 33 and the magnetic cylinder 39 have two sets of magnetic attraction surfaces. Furthermore, due to the certain gap in the socket relationship, the area of ​​the magnetic attraction surface formed by the two sets of magnetic attraction surfaces is also smaller than... Figure 4 The magnetic attraction surface area between the end faces of the moving iron core 33 and the magnetic guide cylinder 39 is large enough that this structure still reduces the magnetic attraction force on the moving iron core 33. This structure can change only the structure of the moving iron core 33 and the magnetic guide cylinder 39 without changing the existing contactor structure and size, and has the functions of connecting and reducing magnetic attraction.

[0073] See Figure 14 As shown, the first socket 392 is fitted over the second socket 332. The first socket 392 and the first main body 393 are integral. In this case, the inner and outer diameters of the first socket 392 are equal to the inner and outer diameters of the first main body 393, respectively. The first connecting surface is the end face of the first main body 393. The second socket 392 is a protruding ring at the end of the inner side of the second main body 333. The outer diameter of the second socket 332 is smaller than the outer diameter of the second main body 333. A second connecting surface is formed between the outer side of the second socket 332 and the outer side of the second main body 333. The length of the second socket 332 only needs to be greater than or equal to the distance between the moving iron core 33 and the stationary iron core 32. In this case, the second connecting surface abuts against the end face of the first socket to form a magnetic attraction; that is, the second connecting surface and the end face of the first socket are magnetic attraction surfaces. This structure only requires changing the structure of the moving iron core 33, without changing the structure of the magnetic cylinder 39. To reduce the magnetic attraction force, the diameter of the magnetic cylinder 39 can be reduced while ensuring that the first sleeve part 392 and the second sleeve part 332 are sleeved.

[0074] See Figure 16 As shown, the first socket 392 is fitted outside the second socket 332. Figure 16 Is with Figure 14 The structure is the opposite: the second socket 332 and the second main body 333 are integrated, and the first socket is a protruding ring on the end face of the first main body 393. In this case, the inner and outer diameters of the second socket 332 are equal to the inner and outer diameters of the second main body 333, and the outer diameter of the first socket 392 is equal to the outer diameter of the first main body 393. A first connecting surface is formed between the inner surface of the first main body and the inner surface of the first socket, and the second connecting surface is the end face of the second main body. The length of the first socket 392 only needs to be greater than or equal to the distance between the moving iron core 33 and the stationary iron core 32. At this time, the first connecting surface and the end face of the second socket abut against each other to form a magnetic attraction; that is, the first connecting surface and the end face of the second socket are magnetic attraction surfaces. This structure only requires changing the structure of the magnetic cylinder 39, without changing the structure of the moving iron core 33. To reduce the magnetic attraction, the diameter of the moving iron core 33 can be reduced while ensuring that the first socket 392 and the second socket 332 are properly connected.

[0075] See Figure 9As shown, the first socket 392 is fitted inside the second socket 332. The first socket 392 is a protruding ring at the end of the first main body 393, and its outer diameter is smaller than that of the first main body 393. A first connecting surface is formed between the outer surface of the first socket 392 and the outer surface of the first main body 393. The second socket 392 is a protruding ring at the end of the second main body 333, and its outer diameter is equal to that of the second main body 333. The second connecting surface is the end face of the second main body 333. The length of the first socket 392 is less than that of the second socket 332. Therefore, the first connecting surface and the end face of the second socket 332 abut against each other to form a magnetic attraction. That is, the first connecting surface and the end face of the second socket are magnetic attraction surfaces. This structure can change only the structure of the moving iron core 33 and the magnetic cylinder 39 without changing the existing contactor structure and size, and has the functions of fitting and reducing magnetic attraction.

[0076] See Figure 10 As shown, the first socket 392 is fitted inside the second socket 332, and... Figure 9 The difference is that the length of the first socket 392 is greater than the length of the second socket 332. In this case, the second connecting surface abuts against the end face of the first socket to form a magnetic attraction, that is, the end face of the second connecting surface and the end face of the first socket are magnetic attraction surfaces. In other embodiments, if the lengths of the first socket 392 and the second socket 332 are equal, then the end faces of the first connecting surface and the second socket, as well as the end face of the second connecting surface and the end face of the first socket, respectively abut against each other. In this case, the moving iron core 33 and the magnetic cylinder 39 have two sets of magnetic attraction surfaces. Furthermore, due to the certain gap in the socket relationship, the area of ​​the magnetic attraction surface formed by the two sets of magnetic attraction surfaces is also smaller than... Figure 4 The magnetic attraction surface area between the end faces of the moving iron core 33 and the magnetic guide cylinder 39 is large enough that this structure still reduces the magnetic attraction force on the moving iron core 33. This structure can change only the structure of the moving iron core 33 and the magnetic guide cylinder 39 without changing the existing contactor structure and size, and has the functions of connecting and reducing magnetic attraction.

[0077] See Figure 13As shown, the first socket 392 is fitted inside the second socket 332. The second socket 332 and the second main body 333 are integral. The first socket is a protruding ring on the end face of the first main body 393. At this time, the inner and outer diameters of the second socket 332 are equal to the inner and outer diameters of the second main body 333, respectively, and the outer diameter of the first socket 392 is smaller than the outer diameter of the first main body 393. A first connecting surface is formed between the outer surface of the first main body and the outer surface of the first socket, and the second connecting surface is the end face of the second main body. The length of the first socket 392 only needs to be greater than or equal to the distance between the moving iron core 33 and the stationary iron core 32. At this time, the first connecting surface and the end face of the second socket abut against each other to form magnetic attraction; that is, the first connecting surface and the end face of the second socket are magnetic attraction surfaces. This structure only requires changing the structure of the magnetic cylinder 39, without changing the structure of the moving iron core 33. To reduce the magnetic attraction force, the diameter of the moving iron core 33 can be reduced while ensuring that the first socket 392 and the second socket 332 are fitted together.

[0078] See Figure 15 As shown, the first socket 392 is fitted inside the second socket 332. Figure 15 Is with Figure 13 The structure is the opposite: the first socket 392 and the first main body 393 are integrated. In this case, the inner and outer diameters of the first socket 392 are equal to the inner and outer diameters of the first main body 393, respectively, and the first connecting surface is the end face of the first main body 393. The second socket 392 is a protruding ring at the outer end of the second main body 393. The inner diameter of the second socket 392 is larger than the inner diameter of the second main body 393, and a second connecting surface is formed between the inner surfaces of the second socket 392 and the second main body 393. The length of the second socket 392 only needs to be greater than or equal to the distance between the moving iron core 33 and the stationary iron core 32. At this time, the second connecting surface abuts against the end face of the first socket to form a magnetic attraction; that is, the second connecting surface and the end face of the first socket are magnetic attraction surfaces. This structure only requires changing the structure of the moving iron core 33, without changing the structure of the magnetic cylinder 39. To reduce the magnetic attraction, the diameter of the magnetic cylinder 39 can be reduced while ensuring the first socket 392 and the second socket 392 are properly connected.

[0079] In other embodiments, the first socket portion 392 is fitted inside the second socket portion 332. Figure 9 , Figure 10 At this time, the inner diameter of the end of the moving iron core 33 is larger than the inner diameter of the middle part, and the outer diameter of the end of the magnetic cylinder 39 is smaller than the outer diameter of the middle part. The position of the change in the inner diameter of the middle part of the moving iron core 33 can be an inclined plane. Figure 9 It can also be a stepped surface. Figure 10 ).exist Figure 5 and Figure 9-10In the illustrated embodiment, the first socket portion 392 forms a first socket structure, and the second socket portion 332 forms a second socket structure. In other embodiments, the first socket structure and the second socket structure may also be separate parts, with the first socket structure fixedly connected to the magnetic cylinder 39 and the second socket structure fixedly connected to the moving iron core.

[0080] In this example, the permanent magnet 38 is a ring-shaped magnet. In other embodiments, multiple block-shaped permanent magnets can be arranged around the outside of the near-end gap between the moving iron core 33 and the stationary iron core 32. The permanent magnets can have a certain gap between them or they can be tightly fitted together. The block-shaped permanent magnets can reduce the amount of permanent magnets used. Moreover, block-shaped permanent magnets are easier to obtain and have a lower cost than ring-shaped permanent magnets. Therefore, using block-shaped permanent magnets can reduce costs while ensuring the magnetic field.

[0081] See Figure 4 As shown, when coil 31 is energized, the magnetic field generated by the coil magnetizes the stationary iron core 32 and the moving iron core 33, thereby generating a magnetic attraction force F between the stationary iron core 32 and the moving iron core 33. 磁2 Attraction. Furthermore, the magnetic field lines emitted by the permanent magnet can selectively conduct along two paths depending on the magnetic reluctance: Path 1: Permanent magnet 38 - stationary iron core 32 - moving iron core 33 - permanent magnet 38; Path 2: Permanent magnet 38 - stationary iron core 32 - yoke plate 35 - magnetic cylinder 39 - moving iron core 33 - permanent magnet 38. According to the principle of minimum magnetic reluctance (magnetic flux always closes along the path of least magnetic reluctance), when the stationary iron core 32 and the moving iron core 33 are attracted, as the distance between the stationary iron core 32 and the moving iron core 33 decreases, the magnetic flux of the permanent magnet 38 will switch to conduct via Path 1. At this time, the moving iron core 33 experiences a magnetic attraction force F in the direction closer to the stationary iron core 32 (upward in the diagram). 磁3 At this moment, the force F2 on the moving iron core 33 is equal to F 磁2 +F 磁3 See also Figure 13 As shown, a non-ferromagnetic, non-magnetic shielding element 4 is provided between the stationary iron core 32 and the moving iron core 33. The shielding element 4 is sandwiched between the near ends of the stationary iron core 32 and the moving iron core 33, reducing the magnetic attraction force F between the stationary iron core 32 and the moving iron core 33. 磁2 and F 磁3 This reduces the force F2 on the moving iron core 33. When the coil 31 switches from being energized to being de-energized, the magnetic field generated by the coil disappears, and simultaneously F... 磁2 The elastic force F of the first reset elastic element disappears. 弹 Overcome F 磁3 And the adhesive force of the contacts allows the moving iron core 33 to return to its original position. From the above, it can be seen that the magnetic shielding component can reduce the magnetic attraction F between the stationary iron core 32 and the moving iron core 33 generated by the permanent magnet. 磁3 Therefore, the magnetic shielding component enables the moving iron core 33 to return to its original position more quickly after the coil 31 is de-energized, thereby improving the de-energization response time of the contactor.

[0082] See Figure 2-4 As shown, since the magnetic cylinder 39 is open at both ends, and the moving iron core 33 and the moving spring 36 are both located at one end of the magnetic cylinder 39, other parts can be installed at the other end of the magnetic cylinder 39 to form a connection with the moving iron core 33 or the moving spring 36. The push rod 34 passes through the moving iron core 33 and is interference-fitted with the moving iron core 33. One end of the push rod 34 is connected to the moving spring 36, and the other end passes through the magnetic cylinder 39 and extends out of the flat yoke 352. One end of the push rod 34 extending beyond the flat yoke 352 is connected to the second reset elastic element. Specifically, the second reset elastic element is a reaction spring 5, one end of which is fixed to the flat yoke 352. One end of the push rod 34 has a pusher 341 fixed relative to it, and the other end of the reaction spring 5 is located on one side of the pusher 341. When the coil is energized, the push rod 34 moves towards the stationary core 32 along with the moving iron core 33 (upward movement in the figure). The pusher 341 compresses the reaction spring 5, deforming it. The reaction spring 5 applies a downward rebound force to the pusher 341, thereby causing the push rod and the moving iron core to return to their original positions. When the coil is de-energized, the rebound force accelerates the return of the moving iron core 33 and the push rod 34 to their original positions, improving the contactor's de-energization response speed. The reaction spring 5, combined with the magnetic shielding element 4, further improves the contactor's de-energization response speed. In this example, one end of the push rod 34 extending from the yoke plate 35 is connected to the reaction spring 5 to improve the contactor's power-off response speed. In other embodiments, an auxiliary contact can also be connected to one end of the push rod 34 extending from the yoke plate 35. The push rod 34 controls the opening and closing of the auxiliary contact, and the auxiliary contact uses the same electromagnetic system as the main contact, simplifying control and increasing the number of contacts, thereby increasing the number of loads that a single contactor can control simultaneously. The contact structure is prior art, and those skilled in the art can add auxiliary contacts based on prior art and the contactor structure described in this invention. The specific structure is not part of this invention and will not be detailed here.

[0083] The workflow of this embodiment is as follows:

[0084] See Figure 4 As shown, the moving iron core 33 maintains a certain distance from the stationary iron core 32 under the action of the first reset elastic element 37, and the far end of the moving iron core 33 abuts against the magnetic guide cylinder 39. The permanent magnet 38 has two paths ( Figure 4 The paths shown by the dashed lines (path 1 and path 2) can be connected. According to the principle of minimum magnetic resistance (magnetic lines of force always close along the path of minimum magnetic resistance), the air gap of path 1 is relatively large, so the magnetic resistance is relatively large. Therefore, the magnetic lines of force of permanent magnet 38 will choose path 2 to be connected, so that the magnetic cylinder has a downward attraction to the moving iron core, and the moving iron core is not easy to shake off.

[0085] When coil 31 is energized and generates a magnetic field, the stationary iron core 32 exerts an upward magnetic attraction F on the moving iron core 33. 磁2 The magnetic field lines of permanent magnet 38 change in two stages:

[0086] (1) Stage 1: The moving iron core 33 just breaks off from the magnetic cylinder 39 and moves upward. The distance between the moving and stationary iron cores is greater than the distance between the moving iron core 33 and the magnetic cylinder 39. The magnetic resistance of path 1 is greater than that of path 2. At this time, the magnetic lines of force of the permanent magnet 38 are still closed through path 2. The moving iron core is subjected to a downward magnetic attraction force F by the permanent magnet ring 38. 磁1 .

[0087] (2) Stage Two: Coil 31 continues to act. As the moving iron core 33 gradually moves upward, the distance between the moving and stationary iron cores decreases, and the distance between the moving iron core 33 and the magnetic cylinder 39 increases. When the magnetic resistance of path one is less than that of path two, the magnetic flux of the permanent magnet 38 is switched to closed conduction through path one. The permanent magnet 38 causes the moving iron core 33 to be subjected to an upward magnetic attraction force F. 磁3 The permanent magnet 38 and the coil 31 work together to attract the moving and stationary iron cores. At this time, the moving spring 36 moves upward with the moving iron core 33 and the push rod 34 and closes with the stationary contact 21.

[0088] When coil 31 is de-energized again, the moving iron core 33 disconnects from the stationary iron core 32 under the action of the reaction spring 5 and the first reset elastic element 37. As the distance between the moving iron core 33 and the stationary iron core 32 increases, the permanent magnet 38 causes the magnetic attraction force on the moving iron core 33 to move downward. When the moving iron core 33 returns to its original position, it remains in its original position under the action of the first reset elastic element 37, the permanent magnet 38, and the magnetic cylinder 39. The magnetic shielding element 4 and the reaction spring 5 can both accelerate the speed at which the moving iron core 33 disconnects from the stationary iron core 32, thereby allowing the moving spring 36 to disconnect from the stationary contact 21 more quickly and improving the de-energizing response speed of the contactor.

[0089] The above embodiments illustrate a scheme in which the magnetic circuit portion, including the push rod, is placed horizontally. Figures 3 to 13 The structure is rotated 90° for ease of explanation; the actual direction is... Figure 1 and Figure 2 The diagram shows a horizontal contactor with its magnetic circuit section arranged horizontally. However, the technical solution described in this invention is also applicable to vertical contactors with their magnetic circuit section arranged vertically.

[0090] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail made to the invention without departing from the spirit and scope of the invention as defined in the appended claims fall within the protection scope of the invention.

Claims

1. A contactor, comprising a housing, a stationary contact disposed on the housing, and a magnetic circuit portion disposed within the housing, the magnetic circuit portion comprising a coil, a stationary iron core and a moving iron core disposed within the coil, a push rod passing through the center of the stationary iron core and the moving iron core and fixedly connected to the moving iron core, a movable spring being provided at the end of the push rod, a movable contact being provided on the movable spring, a proximal end of the moving iron core and the stationary iron core being closer to each other, and a distal end of the moving iron core and the stationary iron core being farther from each other, a first reset elastic element being provided between the proximal ends of the moving iron core and the stationary iron core; When the coil is not energized, under the action of the first reset elastic element, the near ends of the moving iron core and the stationary iron core maintain a certain distance, and the moving spring is disconnected from the stationary contact; when the coil is energized, the moving iron core moves axially and attracts the stationary iron core, and the moving contact closes with the stationary contact. Its features are, A permanent magnet is provided on the outer side of the near-end gap between the moving iron core and the stationary iron core, and a magnetic cylinder is provided on the far end of the moving iron core. When the coil is not excited, there are opposing magnetic attraction surfaces between the magnetic cylinder and the moving iron core. The magnetic attraction surfaces are at a certain angle to the axial direction of the moving iron core. The magnetic field generated by the permanent magnet causes the magnetic cylinder to form a magnetic attraction force on the far end of the moving iron core away from the stationary iron core. The angle formed between the magnetic attraction surfaces and the axial direction of the moving iron core gives the magnetic attraction force of the magnetic attraction surfaces a component in the axial direction of the moving iron core, so as to prevent the moving iron core from shaking shut when the coil is not excited. The contactor also includes one of the following structures: a. The magnetic cylinder and the moving iron core are arranged coaxially, and the magnetic attraction surface that forms a magnetic attraction between the moving iron core and the magnetic cylinder is the end face of the far end of the moving iron core; The magnetic cylinder is a hollow straight cylinder with a diameter abrupt change point between its middle and end, forming a radially raised step at the diameter abrupt change point. The step or end face of the magnetic cylinder is the magnetic attraction surface that forms a magnetic attraction with the moving iron core. The magnetic lines of force emitted by the permanent magnet pass through the magnetic attraction surfaces of the magnetic cylinder and the moving iron core respectively, thereby forming a magnetic attraction force along the axial direction of the moving iron core between the magnetic cylinder and the moving iron core. b. The magnetic cylinder and the moving iron core are arranged coaxially. When the coil is not energized, the magnetic attraction surface that forms a magnetic attraction between the magnetic cylinder and the moving iron core is the end face of the magnetic cylinder. The moving iron core is a hollow straight cylinder with a diameter abrupt change point between its middle and distal ends, forming a radially protruding step at the diameter abrupt change point. The step or end face of the moving iron core is the magnetic attraction surface that forms a magnetic attraction with the magnetic guide cylinder. The magnetic lines of force emitted by the permanent magnet pass through the magnetic attraction surfaces of the magnetic guide cylinder and the moving iron core respectively, thereby forming a magnetic attraction force along the axial direction of the moving iron core between the magnetic guide cylinder and the moving iron core.

2. A contactor according to claim 1, characterized in that, The magnetic cylinder and the moving iron core abut against each other, so that the magnetic attraction surface of the magnetic cylinder is the contact surface between it and the moving iron core, and the magnetic attraction surface of the moving iron core is the contact surface between it and the magnetic cylinder.

3. A contactor according to claim 1, characterized in that, The magnetic cylinder has a first sleeve structure in the direction near the moving iron core, and the moving iron core has a second sleeve structure in the direction near the magnetic cylinder. The first sleeve structure and the second sleeve structure are sleeved together to form a sleeve connection between the magnetic cylinder and the moving iron core.

4. A contactor according to claim 3, characterized in that, The first sleeve structure is a first sleeve portion extending axially from the end of the magnetic cylinder near the moving iron core, so the magnetic cylinder includes a first main body and a first sleeve portion. The second sleeve structure is a second sleeve portion extending axially from the far end of the moving iron core, so the moving iron core includes a second main body and a second sleeve portion. The surface of the first sleeve portion that is used to engage with the second sleeve portion is the first sleeve surface, and the surface of the second sleeve portion that faces the first sleeve surface is the second sleeve surface. The extending directions of the first sleeve surface and the second sleeve surface are parallel to the movement direction of the moving iron core. When the coil is energized, the lengths of the first sleeve portion and the second sleeve portion ensure that the magnetic cylinder and the moving iron core are always engaged, so that the magnetic lines of force emitted by the energized coil pass through the first sleeve surface and the second sleeve surface, causing the magnetic field generated by the energized coil to act on the moving iron core.

5. A contactor according to claim 4, characterized in that, The first socket surface and the first main body have a first connecting surface, and the second socket surface and the second main body have a second connecting surface; The magnetic cylinder and the moving iron core form at least one set of magnetic attraction surfaces. When the first sleeve and the moving iron core form a magnetic attraction, the end face of the first sleeve and the second connecting surface of the moving iron core form a set of magnetic attraction surfaces. When the second sleeve and the magnetic cylinder form a magnetic attraction, the end face of the second sleeve and the first connecting surface of the magnetic cylinder form a set of magnetic attraction surfaces.

6. A contactor according to claim 4, characterized in that, The first socket is fitted onto the outside of the second socket. The inner diameter of the first socket is greater than or equal to the inner diameter of the first main body, and the outer diameter of the second socket is less than or equal to the outer diameter of the second main body. The inner side of the first socket forms the first socket surface, and the outer side of the second socket forms the second socket surface.

7. A contactor according to claim 4, characterized in that, The first socket is fitted inside the second socket. The outer diameter of the first socket is less than or equal to the outer diameter of the first main body, and the inner diameter of the second socket is greater than or equal to the inner diameter of the second main body. The outer side of the first socket forms the first socket surface, and the inner side of the second socket forms the second socket surface.

8. A contactor according to claim 1, characterized in that, It also includes a wiring terminal that passes through the housing and extends into the housing. The end of the wiring terminal is the stationary contact. The extension direction of the wiring terminal is perpendicular to the extension direction of the push rod. The stationary contact and the moving contact are arranged opposite to each other.

9. A contactor according to claim 8, characterized in that, The magnetic cylinder is a hollow straight cylinder with both ends open. The end of the push rod away from the moving spring extends out of the magnetic cylinder through both ends.

10. A contactor according to claim 9, characterized in that, The end of the push rod away from the moving spring is connected to the second reset elastic element. When the coil is energized, the push rod squeezes the second reset elastic element, causing the second reset elastic element to deform. The second reset elastic element applies a spring force to the push rod to make the push rod return to its original position.

11. A contactor according to claim 1, characterized in that, A magnetic shielding component made of non-ferromagnetic material is provided between the moving iron core and the stationary iron core. When the coil is energized, the near end faces of both the moving iron core and the stationary iron core abut against the magnetic shielding component.

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