A relay with protection against high current explosion

Abstract

A relay with anti-large-current explosion includes a housing, a driving unit, a static contact assembly, a dynamic contact assembly, and an arc extinguishing unit. The housing includes a base and a top cover. The base includes a base body, a magnetic mounting seat, and a first magnetic element. The static contact assembly includes a static contact terminal, a static contact, and a static contact external terminal. The dynamic contact assembly includes a dynamic contact terminal, a dynamic spring, and a second magnetic element. When the driving unit drives the dynamic contact assembly to abut against the static contact assembly, the driving unit drives the second magnetic element on the dynamic spring to approach the first magnetic element, and the first magnetic element and the second magnetic element correspond to each other, so that the second magnetic element and the first magnetic element are attracted together. The presence of the first and second magnetic elements can as far as possible avoid the separation between the dynamic contact and the static contact, and improve the reliability of the relay in the large-current contact abutting together.

Description

Technical Field

[0001] This utility model belongs to the field of relay equipment technology, and in particular, it is a relay with protection against high current explosion. Background Technology

[0002] A relay is an electrical control device that causes a predetermined step change in the controlled variable in the electrical output circuit when the change in the input quantity (excitation quantity) reaches a specified requirement. It has an interactive relationship between the control system (also known as the input circuit) and the controlled system (also known as the output circuit). It is commonly used in automated control circuits, and is essentially an "automatic switch" that uses a small current to control a large current. Therefore, it plays a role in automatic adjustment, safety protection, and circuit switching in circuits.

[0003] For example, Chinese patent relay, application number CN202310568251.9, includes a contact portion and a push rod assembly. The contact portion includes two sets of moving spring portions, each comprising a moving spring plate, a moving contact unit, a stationary contact unit, and a moving spring lead-out plate. The moving spring lead-out plate is connected to the moving spring plate, the moving contact unit is disposed on the moving spring plate, and the stationary contact unit is disposed on the moving spring plate and / or the moving spring lead-out plate. Two moving contact units correspond to two stationary contact units respectively. At least one of the two moving spring lead-out plates has a clearance opening. The stationary contact unit in the moving spring portion with the clearance opening includes at least two stationary contacts, and the moving contact unit corresponding to that stationary contact unit includes at least two moving contacts; the at least two stationary contacts correspond to the at least two moving contacts. A first push rod of the push rod assembly is movably inserted through the clearance opening of the moving spring lead-out plate of one of the moving spring portions, and the first push rod is connected to the moving spring plate of the other moving spring portion. The second push rod of the push rod assembly is connected to the moving spring of one of the moving spring sections. The relay switches by having the moving spring abut against the stationary contact unit via the push rod assembly. However, in actual use, current relays are prone to arcing when the contacts actuate, a phenomenon that severely affects the relay's performance and lifespan. When the relay contacts close, due to the small contact gap and the presence of a large current in the circuit, the voltage between the contacts rises rapidly. Almost all the circuit voltage is applied between the contacts, creating a strong electric field. Free electrons from the cathode escape and rush towards the anode, colliding with neutral gas molecules and ionizing them, thus forming a hot electron flow, i.e., an electric arc. Even more seriously, the relay contacts may shatter when arcing, causing the switch to open and the relay to malfunction, affecting its normal use. Utility Model Content

[0004] In view of this, the present invention provides a relay that can improve the stable operation of the relay and has protection against high current explosion, in order to meet industrial needs.

[0005] A relay with protection against high-current explosions includes a housing, a drive unit disposed within the housing, a stationary contact assembly disposed within the housing, a moving contact assembly disposed on one side of the stationary contact assembly, and an arc-extinguishing unit disposed between the stationary contact assembly and the moving contact assembly. The housing includes a base and a top cover disposed on the base. The base includes a base body, a magnetic mounting base disposed on the base body, and a first magnetic member accommodated on the magnetic mounting base. The stationary contact assembly includes a stationary contact terminal fixedly disposed on the base, at least two stationary contacts disposed on the side of the stationary contact terminal facing the moving contact assembly, and a stationary contact external terminal disposed at one end of the stationary contact terminal. The moving contact assembly includes a moving contact terminal fixedly disposed on the base, a moving spring disposed on the moving contact terminal, and at least one second magnetic member fixedly connected to the moving spring. When the driving unit drives the moving contact assembly to abut against the stationary contact assembly, the driving unit drives the second magnetic attractor on the moving spring to approach the first magnetic attractor. The first magnetic attractor and the second magnetic attractor correspond to each other, so that the second magnetic attractor and the first magnetic attractor attract each other, thereby improving the stability of the contact between the moving spring and the stationary contact assembly.

[0006] Furthermore, the drive unit includes an electromagnetic component disposed within the housing, a rotating armature assembly disposed on one side of the electromagnetic component, and a push-pull rod driven to move by the rotating armature assembly.

[0007] Furthermore, the electromagnetic component includes an electromagnetic device and two magnetizable terminals respectively disposed on the electromagnetic device.

[0008] Furthermore, the rotating armature assembly includes a hinge seat disposed on the base, an armature body rotatably connected to the hinge seat, two armature magnetizable ends respectively disposed at both ends of the armature body, and a drive rod disposed on the armature body.

[0009] Furthermore, the push-pull rod connects the moving contact assembly and the drive rod in the rotating armature assembly.

[0010] Furthermore, the moving contact terminal includes a moving contact terminal body and a moving contact external wiring terminal disposed at one end of the moving contact terminal body.

[0011] Furthermore, the moving reed includes a moving reed body disposed on the moving contact terminal, and at least two moving contacts disposed on the side of the moving reed body facing the stationary contact assembly.

[0012] Furthermore, the outer contour of each of the second magnetic components is U-shaped.

[0013] Furthermore, the arc extinguishing unit includes an arc extinguishing element disposed between the moving contact assembly and the stationary contact assembly, and a plurality of through holes disposed on the housing.

[0014] Furthermore, the first magnetic suction element is arranged side by side with the stationary contact assembly.

[0015] Compared with existing technologies, the relay with high-current explosion protection provided by this utility model uses a first magnetic attracting member in the housing and a second magnetic attracting member on the moving spring in the moving contact assembly to restrict the position where the stationary contact assembly and the moving contact assembly abut together. When the driving unit drives the moving contact assembly to abut with the stationary contact assembly, the driving unit drives the second magnetic attracting member on the moving spring to move closer to the first magnetic attracting member. The first magnetic attracting member and the second magnetic attracting member correspond to each other, and the second magnetic attracting member and the first magnetic attracting member attract each other, restricting the position between the moving spring and the stationary contact assembly and improving the stability of the contact between the moving spring and the stationary contact assembly. When the moving contact and the stationary contact conduct and generate repulsive force, or even in the event of an arc explosion, the presence of the first and second magnetic attracting members can minimize the separation between the moving contact and the stationary contact, improving the reliability of the relay's contacts abutting together under high current. Attached Figure Description

[0016] Figure 1 A schematic diagram of the structure of the relay with high current explosion protection provided by this utility model.

[0017] Figure 2 for Figure 1 A partially enlarged schematic diagram of the relay with high current explosion protection at point A.

[0018] Figure 3 for Figure 1 A schematic diagram of a relay with high current explosion protection without the top cover.

[0019] Figure 4 for Figure 3 A schematic diagram of the structure of the first magnetic element in a relay designed to prevent explosions from high current.

[0020] Figure 5 for Figure 3 A schematic diagram of the structure of the second magnetic element in a relay designed to prevent explosions from high current.

[0021] Figure 6 for Figure 3 A schematic diagram of the electromagnetic components in a relay designed to prevent explosions from high current.

[0022] Figure 7 for Figure 3 A schematic diagram of the stationary contact assembly in a relay designed to prevent explosions from high current.

[0023] Figure 8 for Figure 3 A schematic diagram of the structure of the moving contact assembly of a relay with protection against high current explosion. Detailed Implementation

[0024] The specific embodiments of this utility model are described in further detail below. It should be understood that the description of the embodiments of this utility model herein is not intended to limit the scope of protection of this utility model.

[0025] like Figures 1 to 8 The diagram shown is a structural schematic of the high-current explosion-proof relay provided by this utility model. The high-current explosion-proof relay includes a housing 10, a drive unit 20 disposed within the housing 10, a stationary contact assembly 30 disposed within the housing 10, a moving contact assembly 40 disposed on one side of the stationary contact assembly 30, and an arc-extinguishing unit 50 disposed between the stationary contact assembly 30 and the moving contact assembly 40. The high-current explosion-proof relay also includes other functional modules, such as assembly components, etc., which should be known to those skilled in the art and will not be described in detail here.

[0026] The housing 10 includes a base 11 and a top cover 12 disposed on the base 11.

[0027] The base 11 includes a base body 111, a magnetic mounting base 112 disposed on the base body 111, and a first magnetic member 113 accommodated on the magnetic mounting base 112.

[0028] The base body 111 is a rectangular box-shaped structure. One side of the base body 111 is open for mounting the drive unit 20, the stationary contact assembly 30, the moving contact assembly 40, and the arc extinguishing unit 50. The base body 111 is a prior art and will not be described in detail here.

[0029] The magnetic mounting base 112 is used to fix the first magnetic member 113 so that the position of the first magnetic member 113 on the base 11 is stable. The magnetic mounting base 112 is fixedly connected to the base body 111, and the magnetic mounting base 112 and the base body 111 are integrally formed. The magnetic mounting base 112 is disposed at one end of the stationary contact assembly 30, and the magnetic mounting base 112 and the stationary contact assembly 30 are arranged side by side. In this embodiment, the magnetic mounting base 112 is provided with a mounting groove, which is consistent with the outer contour shape of the first magnetic member 113. A positioning groove is provided in the mounting groove, and a positioning protrusion is provided on the first magnetic member 113. When the first magnetic member 113 is placed in the magnetic mounting base 112, the positioning protrusion is accommodated in the mounting groove to quickly position the first magnetic member 113 in the magnetic mounting base 112.

[0030] In this embodiment, the first magnetic member 113 is interference-fitted with the mounting groove on the magnetic mounting base 112 to fix the first magnetic member 113 on the magnetic mounting base 112. The first magnetic member 113 is used to engage and disengage with the second magnetic member 43 in the moving contact assembly 40. Therefore, the first magnetic member 113 will be described in detail in conjunction with the moving contact assembly 40, and will not be repeated here.

[0031] The top cover 12 is used to close one side of the base 11. A sealed cavity is formed between the top cover 12 and the base 11 to stabilize the positions of the drive unit 20, the stationary contact assembly 30, the moving contact assembly 40, and the arc extinguishing unit 50 within the housing 10. The assembly structure between the top cover 12 and the base 11 is prior art and will not be described in detail here.

[0032] The drive unit 20 includes an electromagnetic component 21 disposed within the housing 10, a rotating armature component 22 disposed on one side of the electromagnetic component 21, and a push-pull rod 23 driven to move by the rotating armature component 22.

[0033] The electromagnetic component 21 includes an electromagnetic device 211 and two magnetizable terminals 212 respectively disposed on the electromagnetic device 211. The electromagnetic component 20 is the core component of the electromagnetic relay. The electromagnetic component 20 consists of an iron core and a coil. When the coil is energized, the iron core is magnetized, generating a magnetic field to drive the rotating armature assembly 30 to rotate, thereby realizing the connection or disconnection of the circuit. The magnetizable terminals 212 are integrally formed with the electromagnetic device 211. The magnetizable terminals 212 are the magnetic force release terminals of the electromagnetic component 21. The two magnetizable terminals 212 correspond to the magnetizable terminals 223 of the armature described below. During use, the direction of the current in the coil of the electromagnetic device 211 is adjusted to change the direction of the magnetic field, thereby adjusting the magnetic field of the two magnetizable terminals 212, so that the electromagnetic component 20 attracts the rotating armature assembly 22. The electromagnetic component 20 is a prior art and will not be described in detail here.

[0034] The rotating armature assembly 22 includes a hinge seat 221 mounted on the base 11, an armature body 222 rotatably connected to the hinge seat 221, two magnetizable armature ends 223 respectively mounted at both ends of the armature body 222, and a drive rod 224 mounted on the armature body 222. The hinge seat 221 rotatably mounts the armature body 222 onto the base 11. The magnetizable armature ends 223 on the armature body 222 correspond to the magnetizable ends 212 on the electromagnetic assembly 21. By adjusting the magnetism of the two magnetizable ends 212 through the electromagnetic device 211, the two magnetizable armature ends 223 on the electromagnetic device 211 are attracted, thereby realizing the rotation of the rotating armature assembly 22. The driving method of the rotating armature assembly 22 and the electromagnetic assembly 21 is a prior art and will not be described in detail here.

[0035] One end of the push-pull rod 23 is connected to the movable spring 42 in the movable contact assembly 40, and the other end of the push-pull rod 23 is connected to the drive rod 224 in the rotating armature assembly 22. In this embodiment, one end of the push-pull rod 23 is slidably engaged with the movable spring 42, and the other end of the push-pull rod 23 is hinged to the drive rod 224, thereby enabling the rotating armature assembly 22 to drive the movement of the movable contact assembly 40. The push-pull rod 23, and the connection structure between the push-pull rod 23 and the movable spring 42 and the drive rod 224, are all existing technologies and will not be described in detail here.

[0036] The stationary contact assembly 30 includes a stationary contact terminal 31 fixedly disposed on the base 11, at least two stationary contacts 32 disposed on the side of the stationary contact terminal 31 facing the moving contact assembly 40, and a stationary contact external wiring terminal 33 disposed at one end of the stationary contact terminal 31. In this embodiment, the first magnetic attractor 113 is disposed in the extending direction of the stationary contact assembly 30. It is conceivable that the first magnetic attractor 113 is disposed side by side with the stationary contact assembly 30, so that the first magnetic attractor 113 attracts the moving contact assembly 40 closer to the stationary contact assembly 30. When the moving contact assembly 40 moves into the magnetic attraction range of the first magnetic attractor 113 and the second magnetic attractor 43 described below, the stationary contact assembly 30 attracts the moving contact assembly 40 closer and they abut against each other.

[0037] One end of the stationary contact terminal 31 is fixed to the base 11, and the other end is provided with the stationary contact external wiring terminal 33. The stationary contact terminal 31 is a prior art and will not be described in detail here.

[0038] The stationary contact 32 is used to cooperate with the moving contact assembly 40 to realize energization and de-energization. Its specific working principle will be explained in detail below in conjunction with the moving contact assembly 40, and will not be repeated here.

[0039] The stationary contact external wiring terminal 33 is used for connection with external wiring and is a prior art technology, which will not be described in detail here.

[0040] The moving contact assembly 40 includes a moving contact terminal 41 fixedly disposed on the base 11, a moving spring 42 disposed on the moving contact terminal 41, and at least one second magnetic attractor 43 fixedly connected to the moving spring 42.

[0041] The moving contact terminal 41 includes a moving contact terminal body 411 and a moving contact external wiring terminal 412 disposed at one end of the moving contact terminal body 411.

[0042] The end of the moving contact terminal body 411 away from the moving contact external wiring terminal 412 is fixedly connected to the base 11, thereby fixing the moving contact assembly 40 within the base 11. The moving contact external wiring terminal 412 is used for connection to external wiring, thus enabling the moving contact terminal 41 to connect to external wiring. Both the moving contact terminal body 411 and the moving contact external wiring terminal 412 are existing technologies and will not be described in detail here.

[0043] The movable reed 42 includes a movable reed body 421 disposed on the movable contact terminal 411, and at least two movable contacts 422 disposed on the side of the movable reed body 421 facing the stationary contact assembly 30. One end of the movable reed body 421 is fixedly connected to the movable contact terminal 411. When the driving unit 20 drives the movable contact assembly 40 to abut against the stationary contact assembly 30, the stationary contact 32 on the stationary contact assembly 30 and the movable contact 422 on the movable reed 42 abut against each other, thereby enabling mutual conduction between the stationary contact assembly 30 and the movable contact assembly 40. In this embodiment, there are two stationary contacts 32 and two movable contacts 422 to improve the current-carrying capacity of the stationary contact terminal 31 and the movable reed 42. The movable reed body 421 and the movable contact 422 are existing technologies and will not be described in detail here.

[0044] One end of the push-pull rod 23 passes through the moving contact terminal 411 and is connected to the moving spring 42. The other end of the push-pull rod 23 is connected to the drive rod 224. When the rotating armature assembly 22 drives the moving spring 42 to move, the drive rod 224 in the rotating armature assembly 22 transmits power to the push-pull rod 23 to realize the movement of the push-pull rod 23, and one end of the push-pull rod 23 synchronously drives the moving spring 42 to move. The connection structure between the push-pull rod 23, the moving contact terminal 411, the moving spring 42, and the drive rod 224 is all prior art, and therefore will not be described in detail here.

[0045] The second magnetic chuck 43 cooperates with the first magnetic chuck 113. In this embodiment, the outer contour of each second magnetic chuck 43 is U-shaped, which facilitates the positioning of the second magnetic chuck 43 on the movable spring 42, enabling the second magnetic chuck 43 to be quickly installed on the movable spring 42. Both the first magnetic chuck 113 and the second magnetic chuck 43 are permanent magnets. The second magnetic chuck 43 is fixedly connected to the movable spring 42, and when the movable spring 42 drives the second magnetic chuck 43 to rotate, its rotation path coincides with the position of the first magnetic chuck 113. Therefore, when the driving unit 20 drives the second magnetic chuck 43 on the movable spring 42, the first magnetic chuck 113 and the second magnetic chuck 43 can move closer to each other. When the second magnetic chuck 43 moves into the magnetic attraction range of the first magnetic chuck 113, the second magnetic chuck 43 and the first magnetic chuck 113 attract each other, thereby limiting the relative position between the movable spring 42 and the stationary contact assembly 30. When the driving unit 20 drives the moving contact assembly 40 to abut against the stationary contact assembly 30, the driving unit 20 drives the second magnetic attractor 43 on the moving spring 42 to approach the first magnetic attractor 113. The first magnetic attractor 113 and the second magnetic attractor 43 attract each other, restricting the position between the moving spring 42 and the stationary contact assembly 30, and improving the stability of the contact between the moving spring 42 and the stationary contact assembly 30.

[0046] When the driving unit 20 drives the moving contact assembly 40 to separate from the stationary contact assembly 30, the pulling force provided by the driving unit 20 needs to be greater than the attraction force between the first magnetic 113 and the second magnetic 43, so as to separate the first magnetic 113 and the second magnetic 43, thus realizing the separation between the stationary contact assembly 30 and the moving contact assembly 40.

[0047] The arc extinguishing unit 50 includes an arc extinguishing element 51 disposed between the moving contact assembly 40 and the stationary contact assembly 30, and a plurality of through holes 52 disposed on the housing 10.

[0048] The arc-extinguishing element 51 is arranged along the direction of the moving contact assembly 40 and the stationary contact assembly 30. Multiple arc-extinguishing elements 51 are arranged in sequence to form an arc-extinguishing grid. This grid is typically made of iron and located within the magnetic field range of the moving contact assembly 40 and the stationary contact assembly 30. When the moving spring 42 contacts the stationary contact assembly 30 and generates an arc, the arc-extinguishing grid attracts the arc and utilizes the short-arc extinguishing principle to extinguish the arc by dividing it into multiple short arcs. When the arc enters the grid, it is divided into several short arc segments. Since the voltage drop of the short arcs is mainly concentrated in the cathode and anode regions, when the number of grids is sufficient, the sum of the minimum voltage drops required for each short arc segment will exceed the applied voltage, thus extinguishing the arc itself. The arc-extinguishing element 51 is existing technology and will not be described in detail here.

[0049] The multiple through holes 52 correspond to the arc extinguishing element 51 respectively. The through holes 52 are used to allow the electric arc on the arc extinguishing element 51 to be ejected from the through holes 52, so as to reduce the electric arc energy on the arc extinguishing element 51. The through holes 52 can also provide a discharge channel for the high temperature gas generated during the arc extinguishing process, so as to avoid the gas accumulation causing the pressure inside the outer shell 10 to be too high.

[0050] Compared with the prior art, the relay with high-current explosion protection provided by this utility model uses the first magnetic attractor 113 in the housing 10 and the second magnetic attractor 43 on the moving spring 42 in the moving contact assembly 40 to cooperate with each other, limiting the position where the stationary contact assembly 30 and the moving contact assembly 40 abut together. When the driving unit 20 drives the moving contact assembly 40 to abut together with the stationary contact assembly 30, the driving unit 20 drives the second magnetic attractor 43 on the moving spring 42 to move closer to the first magnetic attractor 113. The first magnetic attractor 113 and the second magnetic attractor 43 correspond to each other, so that the second magnetic attractor 43 and the first magnetic attractor 113 attract each other, limiting the position between the moving spring 42 and the stationary contact assembly 30, and improving the stability of the contact between the moving spring 42 and the stationary contact assembly 30. When the moving contact and the stationary contact are in contact and generate a repulsive force, or even when an electric arc explosion occurs, the presence of the first and second magnetic suction components 113 and 43 can minimize the separation between the moving contact and the stationary contact, thereby improving the reliability of the relay contacts abutting together under high current.

[0051] The above are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Any modifications, equivalent substitutions or improvements within the spirit of the present utility model are covered within the scope of the claims of the present utility model.

Claims

1. A relay with protection against high-current explosions, characterized in that: The relay with high-current explosion protection includes a housing, a drive unit disposed within the housing, a stationary contact assembly disposed within the housing, a moving contact assembly disposed on one side of the stationary contact assembly, and an arc-extinguishing unit disposed between the stationary contact assembly and the moving contact assembly. The housing includes a base and a top cover disposed on the base. The base includes a base body, a magnetic mounting base disposed on the base body, and a first magnetic member accommodated on the magnetic mounting base. The stationary contact assembly includes a stationary contact terminal fixedly disposed on the base, and at least two contacts disposed on the stationary contact terminal facing the moving contact assembly. The moving contact assembly includes a stationary contact on one side of the component and an external terminal for the stationary contact at one end of the stationary contact terminal. The moving contact assembly includes a moving contact terminal fixedly mounted on the base, a moving spring on the moving contact terminal, and at least one second magnetic attractor fixedly connected to the moving spring. When the driving unit drives the moving contact assembly to abut against the stationary contact assembly, the driving unit drives the second magnetic attractor on the moving spring to move closer to the first magnetic attractor. The first magnetic attractor and the second magnetic attractor correspond to each other so that the second magnetic attractor and the first magnetic attractor attract each other, thereby improving the stability of the contact between the moving spring and the stationary contact assembly.

2. The relay with protection against high-current explosion as described in claim 1, characterized in that: The drive unit includes an electromagnetic component disposed within the housing, a rotating armature assembly disposed on one side of the electromagnetic component, and a push-pull rod driven to move by the rotating armature assembly.

3. The relay with protection against high-current explosion as described in claim 2, characterized in that: The electromagnetic component includes an electromagnetic device and two magnetizable terminals respectively disposed on the electromagnetic device.

4. The relay with protection against high-current explosion as described in claim 2, characterized in that: The rotating armature assembly includes a hinge seat disposed on the base, an armature body rotatably connected to the hinge seat, two armature magnetizable ends respectively disposed at both ends of the armature body, and a drive rod disposed on the armature body.

5. The relay with protection against high-current explosion as described in claim 4, characterized in that: The push-pull rod connects the moving contact assembly and the drive rod in the rotating armature assembly.

6. The relay with protection against high-current explosion as described in claim 1, characterized in that: The moving contact terminal includes a moving contact terminal body and a moving contact external wiring terminal disposed at one end of the moving contact terminal body.

7. The relay with protection against high-current explosion as described in claim 6, characterized in that: The moving reed includes a moving reed body disposed on the moving contact terminal, and at least two moving contacts disposed on the side of the moving reed body facing the stationary contact assembly.

8. The relay with protection against high-current explosion as described in claim 1, characterized in that: The outer contour of each of the second magnetic components is U-shaped.

9. The relay with protection against high-current explosion as described in claim 1, characterized in that: The arc extinguishing unit includes multiple arc extinguishing elements disposed between the moving contact assembly and the stationary contact assembly, and multiple through holes disposed on the housing.

10. The relay with protection against high-current explosion as described in claim 1, characterized in that: The first magnetic attractor is arranged side by side with the stationary contact assembly.

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