Normally closed relay

Abstract

The utility model discloses a normally closed relay, which comprises a contact assembly, at least one side of the contact assembly is provided with an arc extinguish chamber, the contact assembly comprises a movable reed and a static reed which are matched with each other, the movable reed is provided with a movable contact, and the static reed is provided with a static contact; the movable reed comprises a main body part and a head part provided with the movable contact, a bending part is arranged between the main body part and the head part, so that the head part is close to the static reed and is positioned on one side, far away from the main body part, of the static reed, and the movable contact is in normally closed fit with the static contact; and an arc channel leading to the arc extinguish chamber is formed between the head part and the bending part. The arrangement of the bending part can make an arc channel on an arc blow-out path, so that the arc can quickly pass through the arc channel to reach the arc extinguish chamber, and the effect of quick arc extinguish is achieved. Therefore, the normally closed contact and the arc extinguishing function can be realized at the same time without enlarging the volume of the product.

Description

Technical Field

[0001] This utility model relates to the field of relay technology, and in particular to a normally closed relay. 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 input quantity changes to a specified value. It is commonly used in automated control circuits. Essentially, it is an "automatic switch" that uses a small current to control a large current, playing roles such as automatic adjustment, safety protection, and circuit switching in the circuit.

[0003] With the rapid development of new energy-related industries, higher demands are being placed on the power of power distribution circuits. Traditional 12VDC~48VDC / 20A power distribution can no longer meet the requirements of social development. Currently, the voltage levels in the new energy industry have reached 450VDC and even 1000VDC, therefore, the development of high-power electromagnetic relays is a future requirement.

[0004] However, when a relay disconnects a 450VDC load of 20A or higher, an extremely high-energy arc is generated between the relay contacts, easily burning the contacts and surrounding plastic materials. This makes most high-power relays unable to handle high-voltage, high-current loads. Therefore, existing high-voltage relays typically incorporate an arc-extinguishing chamber. Some customers, aiming for energy conservation and emission reduction, request the development of normally closed relays, where the coil does not require excitation during normal operation, thus reducing overall power consumption. However, for conventional normally closed contact assemblies, adding an arc-extinguishing chamber to the side of the contact assembly for arc extinguishing would result in a larger overall size and higher cost. Utility Model Content

[0005] This invention addresses the technical problems existing in the prior art by providing a normally closed, small-sized relay suitable for high-voltage, high-current loads.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: a normally closed relay includes a contact assembly, at least one side of which is provided with an arc-extinguishing chamber. The contact assembly includes a moving spring and a stationary spring that cooperate with each other. The moving spring is provided with a moving contact, and the stationary spring is provided with a stationary contact. The moving spring includes a main body and a head on which the moving contact is provided. A bending portion is provided between the main body and the head, so that the head is close to the stationary spring and located on the side of the stationary spring away from the main body. The moving contact and the stationary contact are normally closed. An arc channel leading to the arc-extinguishing chamber is formed between the head and the bending portion.

[0007] Furthermore, the arc-extinguishing chamber is provided with a main arc-extinguishing zone, and the bending line of the bending portion is inclined towards the main arc-extinguishing zone of the arc-extinguishing chamber.

[0008] Furthermore, the moving spring is bifurcated, so that the bending part and the head are respectively divided into two, and the two heads are respectively provided with the moving contact; the arc extinguishing chamber is provided into two, and the two arc extinguishing chambers are located on the opposite outer sides of the two bending parts.

[0009] Furthermore, each of the two arc-extinguishing chambers is provided with a main arc-extinguishing zone, and the bending lines of the two bending portions are respectively inclined toward the main arc-extinguishing zone of the adjacent arc-extinguishing chamber, so that the bending lines of the two bending portions are in a figure-eight shape.

[0010] Furthermore, there are two stationary springs, each with a stationary contact point, and the stationary contacts on the two stationary springs correspond one-to-one with the moving contacts on the two heads.

[0011] Furthermore, the main arc-extinguishing zone of the arc-extinguishing chamber is provided with a plurality of arc-extinguishing grids arranged at intervals along the distribution direction of the moving contact and the stationary contact, and each of the arc-extinguishing grids is perpendicular to the distribution direction of the moving contact and the stationary contact.

[0012] Furthermore, it also includes a magnetic circuit section, which includes a coil frame with coils wound around it, a yoke, an iron core, and an armature. The iron core is inserted into the coil frame, and the yoke is L-shaped, with one side connected to one end of the iron core and the other side located outside the coil frame. The armature is oscillatingly positioned at the blade edge on the other side of the yoke and engages with the other end of the iron core. The main body is connected to the side of the armature facing away from the iron core. The movable spring also includes a connecting part, which is connected to the other side of the yoke facing away from the coil frame and is integrally formed with the main body.

[0013] Furthermore, it also includes a base and a housing. The static spring and the magnetic circuit are respectively disposed on the base. The housing is connected to the base and encloses the magnetic circuit and the contact assembly in its cavity. The arc-extinguishing chamber is formed by the space between the base and the housing.

[0014] Furthermore, the magnetic circuit portion is laterally inserted into the base along the extension direction of the head of the moving spring.

[0015] Furthermore, the main body, the bent portion, and the head form a Z-shaped structure, and the bent portion corresponds to the middle part of the Z-shape.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. Because this utility model has a bent portion between the main body and the head of the reed body, the head is positioned close to the stationary reed and located on the side of the stationary reed away from the main body. Furthermore, the moving contact and the stationary contact are normally closed. An arc channel leading to the arc-extinguishing chamber is formed between the head of the reed body and the bent portion. This allows the utility model to simultaneously achieve normally closed contact and arc-extinguishing functions without increasing the product's size. Therefore, this utility model is a normally closed, small-sized relay suitable for high-voltage, high-current loads.

[0018] 2. The bending line of the bend is inclined towards the main arc-extinguishing zone of the arc-extinguishing chamber, so that the electric arc generated by the contact break can quickly pass through the arc channel to the main arc-extinguishing zone, thereby achieving the effect of rapid arc extinguishing.

[0019] 3. The main arc-extinguishing zone of the arc-extinguishing chamber is equipped with multiple arc-extinguishing grids arranged at intervals along the distribution direction of the moving and stationary contacts. The intervals between the multiple arc-extinguishing grids can extend the arc movement path, thereby accelerating the arc extinguishing.

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the normally closed relay of the present invention is not limited to the embodiments. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention (excluding the outer shell).

[0022] Figure 2 This is the front view of the present invention (excluding the outer casing);

[0023] Figure 3 This is a top view of the present invention (excluding the outer casing);

[0024] Figure 4 This is a right view of the present invention (excluding the outer casing);

[0025] In the diagram, 1. Moving spring; 11. Main body; 12. Bending section; 121. Bending tip; 13. Head; 14. Moving contact; 15. Connecting section; 2. Stationary spring; 21. Stationary contact; 3. Arc extinguishing chamber; 31. Arc extinguishing grid; 4. Arc channel; 5. Magnetic circuit section; 51. Coil frame; 52. Armature; 53. Yoke; 6. Base; 7. Arc. Detailed Implementation

[0026] Please see Figures 1-4As shown, a normally closed relay of this utility model includes a contact assembly, with an arc-extinguishing chamber 3 provided on at least one side of the contact assembly. The contact assembly includes a moving spring 1 and a stationary spring 2 that cooperate with each other. The moving spring 1 has a moving contact 14, and the stationary spring 2 has a stationary contact 21. The spring body includes a main body 11 and a head 13 where the moving contact 14 is located. A bending portion 12 is provided between the main body 11 and the head 13, so that the head 13 is close to the stationary spring 2 and located on the side of the stationary spring 2 away from the main body 11. The moving contact 14 and the stationary contact 21 are normally closed. An arc channel 4 leading to the arc-extinguishing chamber 3 is formed between the head 13 and the bending portion 12. Specifically, the main body 11, the bending portion 12, and the head 13 generally form a Z-shape, and the bending portion 12 corresponds to the middle part of the Z-shape.

[0027] In this embodiment, the arc-extinguishing chamber 3 is provided with a main arc-extinguishing zone, and the bending line 121 of the bending portion 12 is inclined towards the main arc-extinguishing zone of the arc-extinguishing chamber 3. This allows the arc generated by the contact break to quickly reach the main arc-extinguishing zone through the arc channel 4, thereby achieving rapid arc extinguishing. There are two bending lines 121 in the bending portion 12, one located between the bending portion 12 and the main body 11, and the other located between the bending portion 12 and the head 13. The two bending lines 121 are parallel to each other.

[0028] The aforementioned movable spring 1 is bifurcated, resulting in two bent portions 12 and two heads 13, each with a movable contact 14. Two arc-extinguishing chambers 3 are provided, located on opposite outer sides of the two bent portions 12. The bending lines 121 of the two bent portions 12 are inclined towards the main arc-extinguishing area of ​​the adjacent arc-extinguishing chamber 3, forming a V-shape. In other embodiments, the spring body is not bifurcated, and there is only one arc-extinguishing chamber.

[0029] The aforementioned stationary spring 2 consists of two pieces, each with a stationary contact 21. The stationary contacts 21 on the two stationary springs 2 correspond one-to-one with the moving contacts 14 on the two heads 13. Therefore, the contact assembly of this invention constitutes two sets of normally closed contacts.

[0030] In this embodiment, each arc-extinguishing chamber 3 has a main arc-extinguishing zone equipped with multiple arc-extinguishing grid plates 31 arranged at intervals along the distribution direction of the moving contact 14 and the stationary contact 21. Each arc-extinguishing grid plate 31 is perpendicular to the distribution direction of the moving contact 14 and the stationary contact 21. Therefore, after the arc generated by the breaking of the moving contact 14 and the stationary contact 21 enters the main arc-extinguishing zone of the arc-extinguishing chamber 3, it can move sequentially along each arc-extinguishing grid plate 31, thereby extending the arc movement path and accelerating arc extinguishing.

[0031] This utility model also includes a magnetic circuit portion 5, which includes a coil frame 51 with a coil wound on it (not shown in the figure), a yoke 53, an iron core (not shown in the figure), and an armature 52. The iron core is inserted into the coil frame 51. The yoke 53 is L-shaped, with one side connected to one end of the iron core and the other side located outside the coil frame 51. The armature 52 is oscillatingly positioned at the blade edge on the other side of the yoke 53 and engages with the other end of the iron core. The main body portion 11 is connected to the side of the armature 52 facing away from the iron core. The movable spring 1 also includes a connecting portion 15, which is connected to the other side of the yoke 53 facing away from the coil frame 51 and is integrally formed with the main body portion 11.

[0032] This utility model also includes a base 6 and a housing (not shown in the figure). The stationary spring 2 and the magnetic circuit portion 5 are respectively disposed on the base 6. Specifically, the magnetic circuit portion 5 is laterally inserted into the base 6 along the extending direction of the head 13 of the moving spring 1. The housing is connected to the base 6 and encloses the magnetic circuit portion 5 and the contact assembly in its cavity. The arc-extinguishing chamber 3 is formed by the space between the base 6 and the housing.

[0033] This invention discloses a normally closed relay. In its initial state, with the coil unenergized, the moving reed 1 keeps its moving contact 14 closed with the stationary contact 21 under its own reaction force. When the coil is energized, the magnetic circuit 5 generates a magnetic field, and the armature 52, attracted by the iron core, swings the main body 11 of the moving reed in the direction of contact disconnection, causing the moving contact 14 to disconnect from the stationary contact 21. When the coil is de-energized, the magnetic field of the magnetic circuit 5 disappears, and the moving reed, under its own reaction force, returns to the contact closing direction, causing the moving contact 14 and the stationary contact 21 to return to the closed state.

[0034] When the moving contact 14 breaks off from the stationary contact 21, an electric arc 7 is generated (e.g. Figures 1-3 As shown in the figure, when arc 7 is emitted (indicated by the dotted line), the bending portion 12 on the moving spring 1 allows the arc channel 4 to be cleared in the arc blowing path, enabling arc 7 to quickly pass through the arc channel 4 and reach the main arc extinguishing zone of the arc extinguishing chamber 3, thereby achieving the effect of rapid arc extinguishing. Therefore, this invention can simultaneously achieve normally closed contact and arc extinguishing functions without increasing the product size, making this invention a normally closed, small-volume relay suitable for high-voltage, high-current loads.

[0035] The normally closed relay of this utility model is identical to or can be implemented using existing technology for the parts not described herein.

[0036] The above embodiments are only used to further illustrate a normally closed relay of the present invention, but the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A normally closed relay, comprising a contact assembly, wherein at least one side of the contact assembly is provided with an arc-extinguishing chamber, the contact assembly comprising a moving spring and a stationary spring that cooperate with each other, the moving spring having a moving contact and the stationary spring having a stationary contact; characterized in that: The moving reed includes a main body and a head on which the moving contact is disposed. A bending portion is provided between the main body and the head, so that the head is close to the stationary reed and located on the side of the stationary reed away from the main body. The moving contact and the stationary contact are normally closed. An arc channel leading to the arc extinguishing chamber is formed between the head and the bending portion.

2. The normally closed relay according to claim 1, characterized in that: The arc-extinguishing chamber is provided with a main arc-extinguishing zone, and the bending line of the bending part is inclined towards the main arc-extinguishing zone of the arc-extinguishing chamber.

3. The normally closed relay according to claim 1, characterized in that: The moving spring is bifurcated, so that the bending part and the head are respectively divided into two, and the two heads are respectively provided with the moving contact; there are two arc-extinguishing chambers, which are located on the opposite outer sides of the two bending parts.

4. The normally closed relay according to claim 3, characterized in that: Each of the two arc-extinguishing chambers is provided with a main arc-extinguishing zone, and the bending lines of the two bending sections are respectively inclined towards the main arc-extinguishing zone of the adjacent arc-extinguishing chamber, so that the bending lines of the two bending sections are in the shape of a figure eight.

5. The normally closed relay according to claim 3, characterized in that: There are two stationary springs, each with a stationary contact point, and the stationary contacts on the two stationary springs correspond one-to-one with the moving contacts on the two heads.

6. The normally closed relay according to claim 2 or 4, characterized in that: The main arc-extinguishing zone of the arc-extinguishing chamber is provided with a plurality of arc-extinguishing grids arranged at intervals along the distribution direction of the moving contact and the stationary contact, and each of the arc-extinguishing grids is perpendicular to the distribution direction of the moving contact and the stationary contact.

7. The normally closed relay according to claim 1, characterized in that: It also includes a magnetic circuit section, which includes a coil frame with coils wound around it, a yoke, an iron core, and an armature. The iron core is inserted into the coil frame. The yoke is L-shaped, with one side connected to one end of the iron core and the other side located outside the coil frame. The armature is oscillatingly positioned at the blade edge on the other side of the yoke and engages with the other end of the iron core. The main body is connected to the side of the armature facing away from the iron core. The movable spring also includes a connecting part, which is connected to the other side of the yoke facing away from the coil frame and is integrally formed with the main body.

8. The normally closed relay according to claim 1, characterized in that: It also includes a base and a housing. The static spring and the magnetic circuit part are respectively disposed on the base. The housing is connected to the base and encloses the magnetic circuit part and the contact assembly in its housing cavity. The arc-extinguishing chamber is formed by the space between the base and the outer shell.

9. The normally closed relay according to claim 8, characterized in that: The magnetic circuit portion is laterally inserted into the base along the extension direction of the head of the moving spring.

10. The normally closed relay according to claim 1, characterized in that: The main body, the bent part, and the head form a Z-shaped structure, and the bent part corresponds to the middle part of the Z-shape.

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