Contact device and direct current contactor

Abstract

The invention relates to the technical field of direct-current relays, and particularly discloses a contact device and a direct-current contactor. The device comprises a limiting assembly, a push rod assembly comprising a push rod unit and a magnetic pole piece provided with a center hole in a penetrating mode. The limiting assembly comprises at least two insulation supporting legs which are fixedly connected to the upper plate face of the magnetic pole piece. The push rod assembly can move along the axis of the center hole relative to the magnetic pole piece, the push rod unit comprises supporting rods, the supporting rods and the insulation supporting legs are the same in number and are in one-to-one correspondence, the supporting rods are fixedly connected to the insulation base and the supporting plate, and the movable contact piece is arranged on the supporting plate. One of the insulating supporting leg and the supporting rod is provided with a protruding limiting part, and the push rod assembly rotating around the axis of the center hole is stopped at the limiting part and abuts against the other one. According to the device, the limiting mode of the contact device is improved, and damage caused by rubbing is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of DC relays, and particularly to a contact device and a DC contactor. Background Art

[0002] As a kind of control electrical appliance with a large quantity and wide application, a contactor is mainly used in a control circuit to remotely connect and disconnect the circuit, and to control the starting, stopping or running and disconnecting of a motor. It can be combined with an appropriate thermal relay or electronic protection device to form a motor starter to protect a circuit that may be overloaded, and is widely used in industries such as light industry, metallurgy, chemical industry, coal mine, machinery, hoisting, railway, ship and communication.

[0003] According to the working principle of the contactor, the contact device on a direct-acting contactor includes a magnetic pole piece and a push rod assembly. The push rod assembly passes through the central hole of the magnetic pole piece and can freely rotate around the axis of the central hole. The rotational torque of the push rod assembly during operation comes from two elastic members. The push rod assembly has a moving contact piece and a push rod with a determined relative position. To ensure the correct contact direction between the static contact and the moving contact piece, it is necessary to limit the rotational freedom of the push rod assembly. When the moving contact piece contacts the ceramic cover, the push rod will still be subjected to a torsional force from the elastic member. After the push rod moves multiple times, the ceramic cover will continuously scrape the moving contact piece and increase the mating clearance with the moving contact piece, thereby introducing additional debris and causing a risk of foreign object jamming. The stability of the push rod will also be further reduced due to the enlarged gaps between the moving contact piece and the bracket, and between the moving contact piece and the ceramic cover.

[0004] Currently, the common limiting schemes for contact devices all use the ceramic cover for outer fixing and limiting, and for the inner contact device, the metal part of the push rod or the moving contact piece is generally selected.

[0005] However, the above limiting methods have the following defects:

[0006] 1) Using the entire inner cavity surface as the limiting surface requires high control of the dimensional accuracy of the inner cavity of the ceramic cover, resulting in poor mass production performance and low assembly efficiency of the contact device;

[0007] 2) The problem of foreign object jamming caused by debris is difficult to solve. Especially during rapid movement, the side of the moving contact piece is prone to wear and erosion, resulting in a further increase in the mating clearance and expanding the rotational limiting range of the contact device. Summary of the Invention

[0008] The purpose of the present invention is to provide a contact device and a DC contactor, which improve the limiting method of the contact device and reduce the damage caused by scraping.

[0009] To achieve this purpose, the present invention adopts the following technical solutions:

[0010] Contact device, comprising a magnetic pole piece, a limiting component and a push rod component; a central hole runs through the magnetic pole piece; the limiting component includes at least two insulating legs, one end of each insulating leg is fixedly connected to the upper plate surface of the magnetic pole piece; the push rod component can move relative to the magnetic pole piece along the axis of the central hole, the push rod component includes a push rod unit and a moving contact piece, the push rod unit includes a support plate, an insulating seat and a support rod, the number of support rods is the same as and corresponds one-to-one with the number of insulating legs, one end of each support rod is fixedly connected to the insulating seat, and the other end of each support rod is fixedly connected to the support plate, the moving contact piece is arranged on the support plate; among the insulating leg and the support rod, one is provided with a protruding limiting portion, and the push rod component rotating around the axis of the central hole is stopped when the limiting portion abuts against the other one.

[0011] As a preferred technical solution of the contact device, the limiting portion is bent and C-shaped, and the limiting portion cooperates with the other one for limiting.

[0012] As a preferred technical solution of the contact device, the limiting portion is in the shape of a convex hull, and the limiting portion cooperates with the other one for limiting.

[0013] As a preferred technical solution of the contact device, an installation strip extending in the vertical direction is installed on the side surface of the insulating leg facing the central hole, and the installation strip is in a straight plate shape; or the installation strip has the limiting portion.

[0014] As a preferred technical solution of the contact device, the limiting component further includes an upper armature, the upper armature is a cuboid and is located above the magnetic pole piece, the other end of each insulating leg is fixedly connected to a corner of the upper armature, and the support plate is located between the magnetic pole piece and the upper armature; the push rod unit further includes a lower armature and a contact spring member, the lower armature is elastically connected to the insulating seat through the contact spring member, and the contact spring member drives the lower armature to approach the support plate and is stopped when the moving contact piece is clamped between the lower plate surface of the support plate and the lower armature.

[0015] As a preferred technical solution of the contact device, the limiting component further includes a strengthening rod, and adjacent insulating legs are connected by the strengthening rod; one end of the insulating leg is fixedly connected with a fixing foot, the fixing foot is provided with a fixing hole through it, and four fixing columns protrude from the upper plate surface of the magnetic pole piece, and each fixing column is matched and inserted into a fixing hole.

[0016] As a preferred technical solution of the contact device, the installation strip is insert-molded on the side wall of the insulating leg.

[0017] As a preferred technical solution of the contact device, the installation strip and the support rod are made of wear-resistant conductive materials or plastics.

[0018] As a preferred technical solution of the contact device, the mounting strip and the support rod are made of stainless steel or copper.

[0019] A DC contactor includes a ceramic cover, a coil, a static contact, and the above-mentioned contact device. The static contact is arranged above the moving contact piece, and the relative position between the static contact and the magnetic pole piece is fixed; the ceramic cover covers the contact device and the static contact, and the coil is used to drive the push rod assembly to move relative to the magnetic pole piece.

[0020] Advantages of the present invention:

[0021] With the cooperation between the limiting part on one of the insulating legs and the support rod and the other, the contact device realizes the rotational limit of the push rod assembly relative to the magnetic pole piece. The limiting part adopts a protruding structure, which can limit the movement range of the moving contact piece on the premise of ensuring the assembly requirements of the moving contact piece. Therefore, there is no need to separately set a limiting structure for the moving contact piece, thus realizing the structural optimization of the contact device, which in turn helps to expand the arc escape space on both sides of the moving contact piece and improve the safety performance of the contact device. At the same time, the protruding structure of the limiting part can provide good buffering when being impacted, so there will be no situation of direct scraping, thus reducing the risk of damage to the limiting component and the push rod assembly, and ensuring that the contact device still has good stability during high-speed movement. The contact device has the structural characteristics of low part manufacturing cost, high matching dimension accuracy, and good stability.

[0022] Through the setting of the fixed relative position between the static contact and the magnetic pole piece, the DC contactor ensures the smooth on-off between the static contact and the moving contact piece, thus ensuring the smooth operation of the DC contactor; the design of using the coil to drive the push rod assembly meets the control requirements for the contact device and ensures that the position of the moving contact piece can complete corresponding actions according to a predetermined trajectory; and the limitation that the ceramic cover covers the contact device and the static contact forms a dissipation space around the static contact and the moving contact piece. The dissipation space is a structure for magnetic blowout arc extinguishing, and the method of blowing out the arc is used to avoid the explosion inside the DC contactor. With the structural improvement of the DC contactor in cooperation with the above-mentioned contact device, the number of components on the contact device is reduced, which helps to expand the dissipation space, thereby improving the success rate of arc extinguishing. Description of the drawings

[0023] Figure 1 is a schematic structural diagram of the contact device provided in Embodiment 1 of the present invention;

[0024] Figure 2 is a cross-section of the contact device provided in Embodiment 1 of the present invention Figure 1 ;

[0025] Figure 3 is a cross-section of the contact device provided in Embodiment 1 of the present inventionFigure 2 ;

[0026] Figure 4 is a schematic structural view of the limit component provided in the first embodiment of the present invention;

[0027] Figure 5 is a schematic structural view of the push rod component provided in the first embodiment of the present invention;

[0028] Figure 6 is a schematic structural view of the contact device provided in the second embodiment of the present invention;

[0029] Figure 7 is a cross-section of the contact device provided in the second embodiment of the present invention Figure 1 ;

[0030] Figure 8 is a cross-section of the contact device provided in the second embodiment of the present invention Figure 2 ;

[0031] Figure 9 is a schematic structural view of the limit component provided in the second embodiment of the present invention;

[0032] Figure 10 is a schematic structural view of the push rod component provided in the second embodiment of the present invention.

[0033] In the figure:

[0034] 100, limit component; 110, insulating leg; 111, mounting strip; 1111, second limit section; 112, fixing foot; 113, strengthening rod; 120, upper armature;

[0035] 200, push rod unit; 210, support plate; 220, support rod; 221, first limit section; 230, insulating seat; 240, push rod body; 250, contact elastic member; 260, lower armature;

[0036] 300, moving contact piece;

[0037] 400, magnetic pole piece;

[0038] 500, reaction elastic member;

[0039] 600, moving iron core;

[0040] 700, static iron core. Detailed implementation manners

[0041] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. 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.

[0042] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "under" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the first feature has a lower horizontal height than the second feature.

[0043] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0044] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0045] Embodiment 1

[0046] As Figures 1 to 5As shown in the figure, this embodiment provides a contact device, which includes a magnetic pole piece 400, a limiting component 100, and a push rod component; a central hole penetrates through the magnetic pole piece 400; the limiting component 100 includes at least two insulating legs 110, and one end of each insulating leg 110 is fixedly connected to the upper plate surface of the magnetic pole piece 400; the push rod component can move relative to the magnetic pole piece 400 along the axis of the central hole, and the push rod component includes a push rod unit 200 and a moving contact piece 300. The push rod unit 200 includes a support plate 210, an insulating seat 230, and a support rod 220. The number of support rods 220 is the same as that of the insulating legs 110 and they correspond one by one. One end of each support rod 220 is fixedly connected to the insulating seat 230, and the other end of each support rod 220 is fixedly connected to the support plate 210. The moving contact piece 300 is arranged on the support plate 210; among the insulating legs 110 and the support rods 220, one is provided with a protruding limiting portion, and the push rod component that rotates around the axis of the central hole is stopped when the limiting portion abuts against the other.

[0047] With the cooperation of the limiting portion on one of the insulating legs 110 and the support rods 220 and the other, the rotation limit of the push rod component relative to the magnetic pole piece 400 is realized. The limiting portion adopts a protruding structure, which can limit the movement range of the moving contact piece 300 on the premise of ensuring the assembly requirements of the moving contact piece 300. Therefore, there is no need to separately set a limiting structure for the moving contact piece 300, thus realizing the structural optimization of the contact device, which in turn helps to expand the arc escape space on both sides of the moving contact piece 300 and improve the safety performance of the contact device. At the same time, the protruding structure of the limiting portion can provide good buffering when suffering from impact, so there will be no situation of direct scraping, thus reducing the risk of damage to the limiting component 100 and the push rod component, and ensuring that the contact device still has good stability during high-speed movement. The contact device has the structural characteristics of low part manufacturing cost, high matching dimension accuracy, and good stability.

[0048] Exemplarily, the end of the support rod 220 is fixedly connected to the top of the insulating seat 230; the push rod component further includes a push rod body 240, the push rod body 240 is fixedly connected to the insulating seat 230, the push rod body 240 passes through the central hole, and the push rod body 240 is rotationally matched with the central hole.

[0049] In this embodiment, all insulating components including the insulating seat 230 and the insulating legs 110 are made of plastic. Due to the above structural improvement, the probability of the insulating components being scraped is effectively reduced, so the probability of the appearance of non-conductive powder at the contact device is greatly reduced. Therefore, all insulating components can be made of plastic. Moreover, the plastic insulating components also have the advantages of strong insulating ability, good shaping effect, and low production cost, which helps to improve the manufacturing efficiency of the contact device.

[0050] In this embodiment, the limiting component 100 further includes an upper armature 120. The upper armature 120 is a cuboid and is located above the magnetic pole piece 400. The other end of each insulating leg 110 is fixedly connected to a corner of the upper armature 120. The support plate 210 is located between the magnetic pole piece 400 and the upper armature 120. The push rod unit 200 further includes a lower armature 260 and a contact elastic member 250. The lower armature 260 is elastically connected to the insulating seat 230 through the contact elastic member 250. The contact elastic member 250 drives the lower armature 260 to approach the support plate 210 and stops when the moving contact piece 300 is clamped between the lower plate surface of the support plate 210 and the lower armature 260.

[0051] By virtue of the arrangement that the upper armature 120 is fixedly connected to the insulating legs 110, the relative position between the upper armature 120 and the magnetic pole piece 400 is ensured to be fixed, the relative position tolerance between the upper armature 120 and the magnetic pole piece 400 is reduced, and the operating effect of the contact device is improved. The above improvements enable the insulating legs 110 to not only achieve the limiting purpose but also play the role of connecting the upper armature 120 and the magnetic pole piece 400. The above design realizes the structural integration of the contact device, reduces the number of components, and helps to further expand the arc escape space on both sides of the moving contact piece 300. The design of clamping the moving contact piece 300 by the lower armature 260 and the support plate 210 can meet the setting requirements of the moving contact piece 300 on the support plate 210 and helps to realize the planning of the relative position between the lower armature 260 and the upper armature 120. The design of the contact elastic member 250 driving the lower armature 260 enables the moving contact piece 300 to slow down the impact by squeezing the contact elastic member 250 when it rigidly collides with the static contact due to contact, and quickly reset after the moving contact piece 300 separates from the static contact. The above structural improvements not only ensure the connection effect between the moving contact piece 300 and the static contact but also can effectively reduce the probability of damage to the moving contact piece 300 and the static contact.

[0052] Furthermore, the limiting component 100 further includes a strengthening rod 113. Adjacent insulating legs 110 are connected by the strengthening rod 113. The arrangement of the strengthening rod 113 helps to improve the structural strength of the limiting component 100, reduces the risk of deformation of the insulating legs 110 due to accidents, thereby increasing the difficulty of position change of the insulating legs 110 and the upper armature 120, and reducing the probability of damage to the limiting component 100.

[0053] In this embodiment, the push rod assembly further includes a reaction elastic member 500 and a moving iron core 600. A static iron core 700 is fixedly connected to the lower plate surface of the magnetic pole piece 400. The push rod body 240 passing through the central hole also passes through the static iron core 700 and is fixedly connected to the moving iron core 600. The reaction elastic member 500 is clamped between the static iron core 700 and the moving iron core 600. The reaction elastic member 500 drives the moving iron core 600 to move away from the static iron core 700 and stops when the insulating seat 230 presses against the upper plate surface of the magnetic pole piece 400. With the arrangement of the static iron core 700 and the moving iron core 600, the relative movement between the magnetic pole piece 400 and the push rod assembly is limited, and the movement range of the moving contact piece 300 is limited. The design of driving the moving iron core 600 by the reaction elastic member 500 can drive the moving iron core 600 to quickly move away from the static iron core 700, playing a role in resetting the moving iron core 600. The above structural improvement ensures the accurate positioning of the relative movement between the push rod assembly and the magnetic pole piece 400, and ensures the smooth operation of the contact device.

[0054] In the prior art, the debris generated by wear and corrosion cannot be determined. If insulating debris causes jamming between the moving contact piece and the static contact, it will directly lead to the conduction failure of the contactor.

[0055] In this embodiment, the mounting strip 111 and the support rod 220 are made of wear-resistant conductive materials or plastics.

[0056] Exemplarily, the materials of the mounting strip 111 and the support rod 220 are stainless steel or copper.

[0057] In this embodiment, the materials of both the mounting strip 111 and the support rod 220 are wear-resistant metals. This causes both the mounting strip 111 and the support rod 220 in contact during abutment to be conductive members. The debris scraped off due to the rotation of the push rod assembly relative to the magnetic pole piece 400 can only be conductive powder, and the conductive powder will not cause the conduction failure of the contactor, thus avoiding the situation where the contact device enters a serious failure mode. The material limitation of the wear-resistant metal ensures that the debris generated by scraping must be conductive powder, thereby avoiding the occurrence of conduction failure.

[0058] Further, the mounting strip 111 is a self-lubricating copper sheet; the material of the support rod 220 is stainless steel. Specifically, the mounting strip 111 is brass or pure copper, and the support rod 220 is 316L stainless steel.

[0059] In other embodiments of this embodiment, the materials of both the mounting strip 111 and the support rod 220 are plastics. The specific materials of the mounting strip 111 and the support rod 220 are selected by the staff in the field according to the actual project. The specific selection method is a conventional technical means in the field and will not be elaborated here.

[0060] The self-lubricating material has good stability and a smooth surface that is resistant to friction, and can effectively reduce the wear of the mounting bar 111, thereby reducing the generation of conductive powder at the mounting bar 111. The selection of copper and stainless steel materials takes into account the risk of wear of the mounting bar 111 and the support rod 220, and slows down the damage rate of the mounting bar 111 and the support rod 220 as much as possible, and both are metals with high conductivity. The above restrictions reduce the cost of the contact device, improve the working stability, and extend the service life.

[0061] For example, the mounting strip 111 is insert-molded on the side wall of the insulating leg 110. The easy formability and elasticity of the insulating leg 110 made of plastic material and the rigidity, strength and heat resistance of the mounting strip 111 made of metal material complement each other, and a complex and exquisite metal-plastic integrated product can be solidly made, which helps to reduce the size and weight of the limit assembly 100, reduce the production cost of the limit assembly 100, and improve the processing flexibility of the limit assembly 100.

[0062] In this embodiment, the reaction force elastic member 500 and the contact elastic member 250 are both springs, and the reaction force elastic member 500 is sleeved on the push rod body 240. The spring has a simple structure, low production cost and small space occupation. The design of using a spring as an elastic member can improve the working stability of the contact device and also help to reduce the space occupied by the contact device.

[0063] In this embodiment, a mounting bar 111 extending in a vertical direction is mounted on the side of the insulating leg 110 facing the central hole, and the mounting bar 111 is in a straight plate shape.

[0064] In this embodiment, the limiting part is a first limiting section 221 provided on the support rod 220, and the mounting strip 111 is always in close contact with the outer wall of the insulating leg 110. The structure of the limiting part protruding from the first limiting section 221 forms a circular arc convex surface, which can provide good buffering when colliding with the surface of the straight section, thereby reducing the impact suffered by the contact device and reducing the debris generated by scratches. The above structure reduces the difficulty of insert injection molding of the mounting strip 111 on the insulating leg 110, improves the structural stability of the limiting assembly 100, and prolongs the service life of the limiting assembly 100.

[0065] In this embodiment, the first limiting section 221 is bent and C-shaped, and the first limiting section 221 cooperates with another component for limiting. In another implementation manner of this embodiment, the first limiting section 221 is in the shape of a convex hull, and the first limiting section 221 cooperates with another component for limiting. The bent and C-shaped first limiting section 221 is convenient for processing and forming, with low production cost and high manufacturing efficiency, which helps to improve the production efficiency and the yield rate of the contact device. The first limiting section 221 in the shape of a convex hull has a stable structure, low risk of deformation and small risk of damage, which helps to extend the service life of the contact device and reduce the replacement frequency of the contact device. The specific structure of the first limiting section 221 is determined by those skilled in the art according to the actual project, and the specific determination method is a conventional technical means in the art, which will not be elaborated here.

[0066] In this embodiment, both the insulating legs 110 and the support rods 220 are provided with four. The four insulating legs 110 are distributed in a rectangle, and the four support rods 220 are distributed in a rectangle.

[0067] In this embodiment, a fixing foot 112 is fixedly connected to one end of the insulating leg 110. The fixing foot 112 is penetrated with a fixing hole. Four fixing columns protrude from the upper plate surface of the magnetic pole piece 400, and each fixing column is respectively and correspondingly inserted into a fixing hole. By using the design of the cooperation between the fixing columns and the fixing holes on the fixing foot 112, the stable connection of the limiting component 100 on the magnetic pole piece 400 is realized. The above design reduces the difficulty of the limiting component 100 generating position deviation relative to the magnetic pole piece 400, improves the disassembly and assembly efficiency of the limiting component 100 on the magnetic pole piece 400, reduces the production cost of the contact device, and improves the manufacturing efficiency of the contact device.

[0068] Further, the rectangle formed by the four insulating legs 110 encloses the rectangle formed by the four support rods 220, and the installation strip 111 is arranged on the inner side surface of the rectangle surrounded by the insulating legs 110. Specifically, the insulating legs 110 extend in the vertical direction, and the installation strip 111 extends in the vertical direction.

[0069] This embodiment also provides a DC contactor, which includes a ceramic cover, a coil, a static contact and the above-mentioned contact device. The static contact is arranged above the moving contact piece 300 and the relative position between the static contact and the magnetic pole piece 400 is fixed; the ceramic cover covers the contact device and the static contact, and the coil is used to drive the push rod assembly to move relative to the magnetic pole piece 400. Specifically, the coil realizes the relative position adjustment between the push rod assembly and the magnetic pole piece 400 by driving the moving iron core 600 to selectively contact the static iron core 700.

[0070] By setting the relative position between the static contact and the magnetic pole piece 400 to be fixed, the DC contactor ensures the smooth connection and disconnection between the static contact and the moving contact piece 300, thus ensuring the smooth operation of the DC contactor. The design of using the coil to drive the push rod assembly meets the control requirements for the contact device and ensures that the position of the moving contact piece 300 can complete corresponding actions according to a predetermined trajectory. The ceramic cover covers the contact device and the static contact, forming a dissipation space around the static contact and the moving contact piece 300. The dissipation space is used as a magnetic blowout arc extinguishing structure, and the method of blowing out the arc is adopted to avoid the explosion inside the DC contactor. The improvement of the structure of the DC contactor in cooperation with the above contact device reduces the number of components on the contact device, helps to expand the dissipation space, and thus improves the success rate of arc extinguishing.

[0071] Embodiment 2

[0072] As Figures 6 to 10 shown, the contact device of this Embodiment 2 is basically the same as that of the above Embodiment 1. The difference between the two is that the limiting part is the second limiting section 1111 provided on the mounting strip 111, and the second limiting section 1111 and the outer wall of the insulating leg 110 enclose a through hole. The above design reduces the processing difficulty of the support rod 220, improves the structural stability of the push rod unit 200, reduces the risk of irreversible deformation of the push rod unit 200 due to accidents, and extends the service life of the contact device.

[0073] In this embodiment, the second limiting section 1111 is bent and in a C shape, and the second limiting section 1111 cooperates with the other one for limiting. In another implementation manner of this embodiment, the second limiting section 1111 is in a convex shape, and the second limiting section 1111 cooperates with the other one for limiting. The bent and C-shaped second limiting section 1111 is convenient for processing and forming, has low production cost and high manufacturing efficiency, and helps to improve the production efficiency and the qualified product rate of the contact device. The convex-shaped second limiting section 1111 has stable structure, low deformation risk and small damage risk, helps to extend the service life of the contact device, and reduces the replacement frequency of the contact device. The specific structure of the second limiting section 1111 is determined by those skilled in the art according to the actual project, and the specific determination method is a conventional technical means in the art, which will not be elaborated here.

[0074] This embodiment also provides a DC contactor, which includes a ceramic cover, a coil, a static contact and the above contact device. The static contact is arranged above the moving contact piece 300 and the relative position between the static contact and the magnetic pole piece 400 is fixed; the ceramic cover covers the contact device and the static contact, and the coil is used to drive the push rod assembly to move relative to the magnetic pole piece 400. Specifically, the coil realizes the adjustment of the relative position between the push rod assembly and the magnetic pole piece 400 by driving the moving iron core 600 to selectively contact the static iron core 700.

[0075] By fixedly setting the relative positions of the static contact and the magnetic pole piece 400, the DC contactor ensures that the static contact can be smoothly connected and disconnected from the moving contact piece 300, thus ensuring the smooth operation of the DC contactor. The design of using a coil to drive the push rod assembly meets the control requirements for the contact device and ensures that the position of the moving contact piece 300 can complete corresponding actions according to a predetermined trajectory. The ceramic cover is provided to enclose the contact device and the static contact, so as to form a dissipation space around the static contact and the moving contact piece 300. The dissipation space, as a magnetic blowout arc structure, adopts the method of blowing out the arc to avoid the explosion inside the DC contactor. With the above structural improvement of the contact device, the number of components on the contact device is reduced, which helps to expand the dissipation space and thus improve the success rate of arc extinguishing.

[0076] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Contact device, characterized in that, Comprising: A magnetic pole piece (400) having a central hole therethrough; A limiting component (100) including at least two insulating legs (110), one end of each insulating leg (110) being fixedly connected to the upper plate surface of the magnetic pole piece (400); A push rod assembly capable of moving relative to the magnetic pole piece (400) along the axis of the central hole, the push rod assembly including a push rod unit (200) and a moving contact piece (300), the push rod unit (200) including a support plate (210), an insulating seat (230), and support rods (220), the number of support rods (220) being the same as and corresponding one-to-one with the insulating legs (110), one end of each support rod (220) being fixedly connected to the insulating seat (230), the other end of each support rod (220) being fixedly connected to the support plate (210), and the moving contact piece (300) being disposed on the support plate (210); Among the insulating leg (110) and the support rod (220), one is provided with a protruding limiting portion, and the push rod assembly rotating around the axis of the central hole is stopped when the limiting portion abuts against the other.

2. The contact device according to claim 1, characterized in that, The limiting portion is bent and C-shaped, and the limiting portion cooperates with the other for limiting.

3. The contact device according to claim 1, characterized in that The limiting portion is in the shape of a convex hull, and the limiting portion cooperates with the other for limiting.

4. The contact device according to claim 2 or 3, characterized in that, An installation strip (111) extending in the vertical direction is mounted on the side surface of the insulating leg (110) facing the central hole, and the installation strip (111) is in the shape of a straight plate; or The installation strip (111) has the limiting portion.

5. The contact device according to claim 1, characterized in that, The limiting component (100) further includes an upper armature (120), the upper armature (120) being a cuboid and located above the magnetic pole piece (400), the other end of each insulating leg (110) being fixedly connected to a corner of the upper armature (120), and the support plate (210) being located between the magnetic pole piece (400) and the upper armature (120); the push rod unit (200) further includes a lower armature (260) and a contact elastic member (250), the lower armature (260) being elastically connected to the insulating seat (230) through the contact elastic member (250), and the contact elastic member (250) driving the lower armature (260) to approach the support plate (210) and stopping when the moving contact piece (300) is clamped between the lower plate surface of the support plate (210) and the lower armature (260).

6. The contact device according to claim 5, characterized in that, The limiting component (100) further includes a strengthening rod (113), adjacent insulating legs (110) being connected to each other through the strengthening rod (113); one end of the insulating leg (110) is fixedly connected with a fixing foot (112), the fixing foot (112) having a fixing hole therethrough, and four fixing columns protruding from the upper plate surface of the magnetic pole piece (400), each fixing column being fitted and inserted into one fixing hole.

7. The contact device according to claim 4, characterized in that, The installation strip (111) is insert-molded on the side wall of the insulating leg (110).

8. The contact device according to claim 7, characterized in that, The installation strip (111) and the support rod (220) are made of a wear-resistant conductive material or plastic.

9. The contact device according to claim 7, characterized in that, The mounting strip (111) and the support rod (220) are made of stainless steel or copper material.

10. DC contactor, characterized in that, It includes a ceramic cover, a coil, a static contact, and the contact device according to any one of claims 1-9. The static contact is disposed above the moving contact piece (300), and the relative position of the static contact and the magnetic pole piece (400) is fixed. The ceramic cover covers the contact device and the static contact, and the coil is used to drive the push rod assembly to move relative to the magnetic pole piece (400).

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