Normally-closed bidirectional high-voltage relay

Abstract

The invention discloses a normally-closed bidirectional high-voltage relay which comprises a driving coil and a seat plate. The driving coil is installed on the base plate through supporting plates fixed to the two sides of the driving coil, two control pins and two working pins are installed on the base plate, the tops of the two working pins are each provided with a static contact, the tops of the control pins are connected with the driving coil through wires, a movable contact piece is installed below the driving coil, and the movable contact piece is connected with the base plate through wires. Two contacts on the movable contact piece are opposite to the two static contacts and are arranged in the arc extinguishing chamber; the seat plate is also provided with a shell for sealing the driving coil and the seat plate; and the lower ends of the working pin and the control pin extend out of the seat plate and are provided with an isolator for isolating the working pin and the control pin. The requirement of a 20A high-voltage small-load relay is met, the two movable contacts and the two static contacts are connected to form a loop, non-polarity setting of relay pins can be achieved through the arc extinguishing device, and the universality of the relay is improved.

Description

Technical Field

[0001] The present invention relates to the field of relays, and in particular to a normally closed bidirectional high-voltage relay. Background Art

[0002] Currently, high-voltage contactors for high-voltage control devices that meet stringent requirements generally have a minimum load current of 50A. Using them for loads below 20A is wasteful, bulky, heavy, and costly. Furthermore, some 50A electronic controls (such as SSPCs) are expensive, making them unsuitable for low-cost designs. For example, the electromagnetic relay disclosed in EP3940734B places fixed and movable contacts between a first and second arc-extinguishing plate, and an arc-extinguishing magnet between the fixed and movable contacts. This directs arcs generated during relay contact to the arc-extinguishing plates. However, this design can only extinguish arcs generated by current flowing in a single direction and cannot achieve bidirectional control. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a normally closed bidirectional high-voltage relay.

[0004] The technical solution of the present invention: A normally closed bidirectional high-voltage relay comprises a drive coil and a base plate; the drive coil is mounted on the base plate via support plates fixed on both sides thereof; two control pins and two working pins are mounted on the base plate; a static contact is mounted on the top of each of the two working pins; the top of the control pin is connected to the drive coil via a wire; a moving contact piece is mounted below the drive coil; the two contacts on the moving contact piece are opposite to the two static contacts and are both placed in an arc extinguishing cover; a shell is also mounted on the base plate to enclose the drive coil and the base plate; the lower ends of the working pin and the control pin extend out of the base plate, and an isolator is mounted to isolate the two.

[0005] The arc extinguishing cover includes a magnetic steel groove and an arc extinguishing chamber. The two magnetic steel grooves are respectively covered on the static contacts and isolated by arc extinguishing partitions. The arc extinguishing chamber is placed below the arc extinguishing magnetic steel and isolated from the static contact by the partition. The arc extinguishing magnetic steel is installed in the arc extinguishing chamber.

[0006] The isolator is fixed to the bottom of the shell, an insulating pad is provided between the isolator and the shell, and a cylinder is processed at the lower end of the isolator to surround the control pin.

[0007] An air filling tube is processed on the side wall of the shell and passes through the interior, and the opening of the air filling tube is closed by a rubber cap.

[0008] L-shaped mounting ears are also installed on the bottoms of both sides of the shell.

[0009] Beneficial effects of the present invention: It fills the demand for 20A high-voltage small-load relays, connects two moving contacts with two static contacts to form a circuit, and can realize the non-polarity setting of the relay pins through the arc extinguishing device, which has the versatility of the positive-price relay. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the explosion structure of a relay.

[0011] Figure 2 This is a schematic diagram of the relay base plate structure.

[0012] Figure 3 This is a schematic diagram of the arc extinguishing cover structure of the relay.

[0013] Figure 4 It is a schematic diagram of the assembly structure of the arc extinguishing cover and base plate of the relay.

[0014] Figure 5 This is a schematic diagram of the gas-filled tube structure of the relay.

[0015] Figure 6 This is a schematic diagram of the contact structure of a relay.

[0016] Figure 7 and Figure 8 This is a schematic diagram of the arc extinguishing principle of the relay.

[0017] Figure markings: 1-housing, 2-driving coil, 3-base plate, 31-static contact, 32-arc extinguishing magnet, 33-working pin, 34-control pin, 4-arc extinguishing cover, 41-magnetic steel slot, 42-arc extinguishing chamber, 43-partition, 5-insulating pad, 6-isolating cylinder, 7-moving contact piece, 8-inflating tube, 9-support plate. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the like Figure 1 As shown, a normally closed bidirectional high-voltage relay includes a drive coil 2 and a base plate 3; the drive coil 2 is mounted on the base plate 3 via support plates 9 fixed on both sides thereof, two control pins 34 and two working pins 33 are mounted on the base plate 3, a static contact 31 is mounted on the top of each of the two working pins 33, the top of the control pin 34 is connected to the drive coil 2 via a wire, a moving contact piece 7 is mounted below the drive coil 2, the two contacts on the moving contact piece 7 are opposite to the two static contacts 31 and are all placed in the arc extinguishing cover 4; a housing 1 is also mounted on the base plate 3 to enclose the drive coil 2 and the base plate 3; the lower ends of the working pins 33 and the control pins 34 extend out of the base plate 3, and an isolator 6 is mounted to isolate the two.

[0019] like Figure 3As shown, the arc extinguishing cover 4 includes a magnetic steel slot 41 and an arc extinguishing chamber 42. The two magnetic steel slots 41 are respectively covered on the static contact 31 and separated by an arc extinguishing chute 43. Figure 2 As shown, the arc extinguishing chamber 42 is placed below the arc extinguishing magnetic steel 32 and isolated from the static contact 31 by a partition, and the arc extinguishing magnetic steel 32 is installed in the arc extinguishing chamber 42.

[0020] like Figure 1 As shown, the isolator 6 is fixed to the bottom of the housing 1, an insulating pad 5 is provided between the isolator 6 and the housing 1, and a cylinder is processed at the lower end of the isolator 6 to surround the control pin 34.

[0021] like Figure 5 As shown, an air filling tube 8 is processed on the side wall of the housing 1 and passes through the interior, and the opening of the air filling tube 8 is closed by a rubber cap.

[0022] like Figure 1 As shown, L-shaped mounting ears are also installed on the bottom of both sides of the housing 1.

[0023] See Table 1 for specific performance Table 1 Performance indicators

[0024] Example 1: Figure 1 As shown in the figure, the structure of a normally closed, bidirectional, high-voltage relay consists of four main parts. The first part is the contact system, consisting of a base plate assembly and a static contact assembly, which connects the load circuit. The second part is the drive system, consisting of an electromagnet assembly and an armature spring assembly. Energizing the coil in the electromagnet assembly drives the armature spring assembly to rotate, connecting the spring assembly to the static contact assembly in the contact system, thereby connecting the load circuit. The third part is the housing system. The fourth part is the arc extinguishing system, which uses magnetic blowout technology.

[0025] An arc-blowing magnet is introduced in the structural design of the contact system and placed directly below the static contact. The surface perpendicular to the magnet and the contact is the direction of the magnetic field, and the surface facing outward is the S pole. When the contact is disconnected, the arc is subjected to force in the magnetic field generated by the magnet, blowing the arc horizontally to both sides of the contact (outside or inside). The arc column is elongated and the arc voltage increases. When the arc voltage is lower than the arc volt-ampere characteristic curve, the arc is extinguished.

[0026] At the same time, the key to the horizontal arc blowing movement is that it requires a sufficiently large arc cavity volume and cooling area. If the arc movement distance is too small, the arc is very likely to be rebounded, and the rebounded arc continues to burn the contacts. In order to prevent the arc blowing from contacting the metal cover and causing a short circuit, the arc-resistant insulating material nylon sheet is selected to process the arc shield. The arc shield and the arc blowing magnet form an arc extinguishing device. The arc extinguishing device completely separates the arc from the metal cover, so that the arc is extinguished in the arc cavity. The arc cavity is equipped with a cooling surface and an arc-isolating surface to help extinguish the arc. The arc shield is also designed with a cavity for placing the arc blowing magnet. The cavity position forms a physical insulation between the arc blowing magnet and the base plate, the terminal and the static contact assembly to avoid high-voltage breakdown and short circuit between the arc blowing magnet, the terminal and the static contact assembly.

[0027] Example 2: Figure 6 As shown, the working pin of this application has no memory requirement and can be energized in both directions. The main structure is that an arc shield is designed in the contact system, and an arc extinguishing cavity is set on both sides of the contact system); Figure 7 As shown, the space for arc blowing is reasonably allocated according to the space. When the current enters from the left and exits from the right, the arc blows toward the outside. When the current enters from the left and exits from the right, the arc blows toward the inside.

[0028] Example 3: Figure 5 As shown, an air filling pipe is provided on the outer cover assembly. After the outer cover assembly is welded to the base plate, gas (three atmospheres of pressure) is filled into the product to cool the arc and accelerate the arc extinction.

Claims

1. A normally closed bidirectional high-voltage relay, comprising a drive coil (2) and a base plate (3), characterized in that: The driving coil (2) is mounted on the base plate (3) via support plates (9) fixed on both sides thereof. Two control pins (34) and two working pins (33) are mounted on the base plate (3). A static contact (31) is mounted on the top of each of the two working pins (33). The top of each of the control pins (34) is connected to the driving coil (2) via a wire. A moving contact piece (7) is mounted below the driving coil (2). The two contacts on the moving contact piece (7) are opposite to the two static contacts (31) and are both placed in the arc extinguishing cover (4). A housing (1) is also mounted on the base plate (3) to enclose the driving coil (2) and the base plate (3). The lower ends of the working pins (33) and the control pins (34) extend outside the base plate (3), and an isolator (6) is mounted to isolate the two.

2. The normally closed bidirectional high-voltage relay according to claim 1, characterized in that: The arc extinguishing cover (4) comprises a magnetic steel slot (41) and an arc extinguishing chamber (42), the two magnetic steel slots (41) respectively covering the static contact (31) and isolated by an arc extinguishing partition (43), the arc extinguishing chamber (42) being placed below the arc extinguishing magnetic steel (32) and isolated from the static contact (31) by the partition, and the arc extinguishing magnetic steel (32) being installed in the arc extinguishing chamber (42).

3. The normally closed bidirectional high-voltage relay according to claim 1, characterized in that: The isolator (6) is fixed to the bottom of the housing (1), an insulating pad (5) is provided between the isolator (6) and the housing (1), and a cylinder is processed at the lower end of the isolator (6) to surround the control pin (34).

4. The normally closed bidirectional high-voltage relay according to claim 1, characterized in that: An air filling tube (8) is also formed on the side wall of the housing (1) and is connected to the interior, and the opening of the air filling tube (8) is sealed by a rubber cap.

5. The normally closed bidirectional high-voltage relay according to claim 1, characterized in that: L-shaped mounting ears are also installed on the bottom of both sides of the housing (1).

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