Pneumatic switch of IGBT (Insulated Gate Bipolar Translator) equipment

Abstract

The utility model relates to the technical field of power electronic devices, and specifically discloses an IGBT equipment pneumatic switch. A lower notch is formed in the bottom end of the top block, the current connecting block is located at the lower notch, an upper notch and a through groove are sequentially formed in the top end of the top block from top to bottom, and an embedded nut is embedded in the through groove; a step bolt penetrates through the bottom of the current connecting block and penetrates through the current connecting block to be in threaded connection with the embedded nut of the top block. The current connecting block is arranged to be in a state of moving up and down and two sides, and the pin is matched with the spring, so that when the current connecting block is in contact with the copper contact below, the current connecting block is buffered due to the movement of the current connecting block and the stretching of the spring, and the direct hard contact between the current connecting block and the copper contact is effectively avoided; deformation and damage of the current connecting block and the copper contact are effectively avoided, automatic leveling is achieved in the process, the contact effect of the current connecting block and the copper contact is better, and the conditions of poor contact, open circuit and sparking are effectively avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of power electronic devices, and in particular relates to a pneumatic switch for IGBT equipment. Background Art

[0002] IGBT (Insulated Gate Bipolar Transistor), also known as the insulated gate bipolar transistor (IGBT), is a fully controlled, voltage-driven power semiconductor device composed of a BJT (bipolar junction transistor) and a MOS (insulated gate field-effect transistor). It combines the advantages of both MOSFETs and bipolar transistors. It offers high-frequency characteristics, low switching losses, and high input impedance, making it commonly used in power converters, inverters, motor drives, and other fields.

[0003] IGBT devices require high-frequency control of high current switching, making conventional switches impractical. Instead, a cylinder is required to rapidly switch the current connection block (the existing block consists of a conductive plate and two contacts that mate with the copper contacts) and the copper contacts on the copper busbar. Due to the high operating frequency and high contact force, a special design is required. The existing block is fixedly connected to the top block, creating direct, hard contact without any buffering. Frequent hard collisions between the block and the copper contacts can easily cause deformation and damage, affecting the proper operation of the switch. Utility Model Content

[0004] The present invention addresses the problem in the prior art that the current connection block and the copper contact are in direct hard contact, which easily leads to deformation and damage of the current connection block and the copper contact. The present invention proposes the following technical solutions:

[0005] An IGBT device pneumatic switch comprises a cylinder fixing plate, a cylinder supporting plate, a copper contact pad, a cylinder, a top block, a current connection block and a copper contact pad;

[0006] A lower notch is provided at the bottom of the top block, the current connection block is located at the lower notch, and an upper notch and a through slot are provided at the top of the top block in sequence from top to bottom, wherein an embedded nut is embedded in the through slot;

[0007] A step bolt passes through the bottom of the current connection block, wherein the step bolt passes through the embedded nut of the current connection block and the top block for threaded connection, so that the current connection block can move up and down, wherein the diameter of the step bolt is smaller than the diameter of the hole passing through the current connection block, so that the current connection block can move on both sides.

[0008] As a preferred embodiment of the above technical solution, the top block is evenly provided with pits inward at the position corresponding to the lower notch, the current connection block is provided with pins at the corresponding position, there is a certain distance between the pins and the pits, and a spring is provided around the pins between the pits and the current connection block.

[0009] As a preferred embodiment of the above technical solution, the copper contact pad is evenly provided with mounting grooves, a copper busbar is placed in the mounting groove, a fixing rod is passed through one side of the copper busbar, a copper contact is provided at one end of the fixing rod, wherein the copper contact is against the surface of the copper busbar, and the other end of the fixing rod passes through the copper contact pad and is fixedly connected to the nut.

[0010] As a preferred embodiment of the above technical solution, screw rods are evenly threaded through the bottom of the copper contact pad, and the screw rods are threaded through the other side of the top of the copper busbar.

[0011] As a preferred embodiment of the above technical solution, a cylinder connecting block is installed at the output end of the cylinder, and the cylinder connecting block is embedded in the upper slot. Holes are evenly opened at positions corresponding to the upper slots on both sides of the top block, and positioning holes are evenly opened at corresponding positions on both sides of the cylinder connecting block. The cylinder connecting block and the top block are connected through a quick-plug connector, and the quick-plug connector is inserted into the positioning hole through the hole.

[0012] As a preferred embodiment of the above technical solution, the cylinder fixing plate, cylinder support plate, copper contact pad and top block are all made of high-voltage resistant insulating materials.

[0013] The beneficial effects of the utility model are:

[0014] The utility model arranges the current connection block to be movable upward and downward and on both sides, and is equipped with a pin and a spring. When the current connection block contacts the copper contact below, it will be buffered due to the movable current connection block and the expansion and contraction of the spring, effectively avoiding direct hard contact between the current connection block and the copper contact, effectively avoiding deformation and damage of the current connection block and the copper contact, reducing the impact on the normal use of the switch, and automatically leveling during this process, so that the contact effect between the current connection block and the copper contact is better, effectively avoiding poor contact, circuit breaker and sparking. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the split structure of the connection between the cylinder and the top block;

[0017] Figure 3 Schematic diagram of the cross-sectional structure of the top block;

[0018] Figure 4 Schematic diagram of the cross-sectional structure of the copper contact pad.

[0019] In the picture:

[0020] 1. Cylinder fixing plate; 2. Cylinder support plate; 3. Copper contact pad; 31. Mounting slot; 4. Cylinder; 41. Cylinder connecting block; 411. Positioning hole; 42. Quick connector; 5. Top block; 51. Upper notch; 52. Lower notch; 53. Socket; 54. Through slot; 55. Recess; 56. Embedded nut; 6. Current connecting block; 61. Step bolt; 62. Pin; 63. Spring; 7. Copper busbar; 71. Copper contact; 72. Fixing rod; 73. Screw rod. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Example

[0022] like Figure 1-Figure 4 As shown, a pneumatic switch for IGBT equipment includes a cylinder fixing plate 1, a cylinder support plate 2, a copper contact pad 3, a cylinder 4, a top block 5, a current connection block 6 and a copper contact pad 3. The cylinder fixing plate 1 and the copper contact pad 3 are connected through a symmetrical cylinder support plate 2. The cylinder 4 is mounted on the inner side of the cylinder fixing plate 1, the top block 5 is mounted on the output end of the cylinder 4, and the current connection block 6 is mounted on the bottom of the top block 5; wherein, a lower notch 52 is opened at the bottom end of the top block 5, and the current connection block 6 is located at the lower notch 52; an upper notch 51 and a through slot 54 are opened at the top end of the top block 5 in sequence from top to bottom, and an embedded nut 56 is embedded in the through slot 54; a step bolt 61 passes through the bottom of the current connection block 6, wherein the step bolt 61 passes through the current connection block 6 and the top block 5 The embedded nut 56 is threadedly connected, so that the current connection block 6 can move up and down, wherein the diameter of the step bolt 61 is smaller than the diameter of the hole passing through the current connection block 6, so that the current connection block 6 can move on both sides, and the step bolt 61 plays a limiting role. Under the action of force, the current connection block 6 can move up and down and on both sides in the lower notch 52 of the top block 5, so that the current connection block 6 is buffered when it contacts the copper contact 71 below, effectively avoiding direct hard contact between the current connection block 6 and the copper contact 71, and avoiding deformation and damage of the current connection block 6 and the copper contact 71; in addition, glue is applied to the outside of the embedded nut 56, and the step bolt 61 and the embedded nut 56 are threadedly connected, so that this fixed connection method is stable and reliable, so that the current connection block 6 is stable after installation.

[0023] During specific operation, when power is turned on, the control cylinder 4 extends and presses the top block 5 downward, so that the current connection block 6 contacts the copper contact 71 below, thereby energizing the copper bars 7 on both sides. During the contact process, the current connection block 6 will move up and down and shake on both sides, thereby being buffered; when power is turned off, the control cylinder 4 contracts and lifts the top block 5 upward, so that the current connection block 6 and the copper contact 71 are separated and disconnected, thereby disconnecting the current of the copper bars 7 on both sides.

[0024] The advantage of the present invention is that, based on the existing technology, the current connection block 6 is set to a state where it can move upward and downward and on both sides. When the current connection block 6 contacts the copper contact 71 below, it will be buffered because of the mobility of the current connection block 6, effectively avoiding direct hard contact between the current connection block 6 and the copper contact 71, effectively avoiding deformation and damage of the current connection block 6 and the copper contact 71, and reducing the impact on the normal use of the switch.

[0025] Among them, the current connection block 6 is an integrated type. Compared with the existing technology of a plate and two contacts, the current connection block 6 is a plane in contact with two copper contacts 71. The contact effect is better than the existing technology when multiple planes are in separate contact. There will be no relative sliding and no impact on the normal use of the switch.

[0026] In addition, the current connection block 6 and the copper contact 71 are both made of alloy material with high hardness. When they are frequently contacted or used with great force, the current connection block 6 and the copper contact 71 are not easily deformed or damaged.

[0027] Furthermore, pits 55 are evenly opened inward at the position corresponding to the lower notch 52 of the top block 5, and pins 62 are provided at the corresponding position of the current connection block 6. There is a certain distance between the pin 62 and the pit 55, which limits the range of up and down movement of the current connection block 6. A spring 63 is provided on the periphery of the pin 62 corresponding to the pit 55 and the current connection block 6, so that when the current connection block 6 moves up and down and shakes on both sides, it will be further buffered by the expansion and contraction of the spring 63. In addition, since the shapes of the two copper contacts 71 cannot be exactly the same, there are different thicknesses, depressions, protrusions or inclinations, etc., the current connection block 6 that can shake and is buffered by the spring 63 can be automatically leveled, so that the contact effect between the current connection block 6 and the two copper contacts 71 below is better and more stable.

[0028] Furthermore, mounting grooves 31 are evenly opened on the copper contact pad 3, and the copper busbar 7 is placed in the mounting groove 31. The copper busbar 7 is stuck in the mounting groove 31 to limit the rotation of the copper busbar 7. A fixing rod 72 is passed through one side of the copper busbar 7, and a copper contact 71 is provided at one end of the fixing rod 72, wherein the copper contact 71 is against the surface of the copper busbar 7, and the other end of the fixing rod 72 passes through the copper contact pad 3 and is fixedly connected with a nut. This installation method is convenient for disassembly and assembly, and convenient for replacing the copper busbar 7 and the copper contact 71.

[0029] Furthermore, a screw rod 73 is evenly threaded through the bottom of the copper contact pad 3, and the screw rod 73 is threaded through and connected to the other side of the top of the copper busbar 7. The part of the screw rod 73 extending out of the copper busbar 7 can be used as a wire connection column; in conjunction with the fixing rod 72, the copper busbar 7 is fixed by the fixing rod 72 and the screw rod 73 at the same time, and one is fixed from bottom to top and the other is fixed from top to bottom, so the fixing effect is better; when the switch generates vibration during high-frequency operation, the copper busbar 7 is not easy to loosen.

[0030] Furthermore, a cylinder connecting block 41 is installed at the output end of the cylinder 4, and the cylinder connecting block 41 is embedded in the upper slot 51. Jacks 53 are evenly provided at positions corresponding to the upper slot 51 on both sides of the top block 5, and positioning holes 411 are evenly provided at corresponding positions on both sides of the cylinder connecting block 41. The cylinder connecting block 41 is connected to the top block 5 through a quick-insert connector 42, and the quick-insert connector 42 is inserted into the positioning hole 411 through the jacket 53. In this way, the top block 5 can be installed from the side, which is convenient for disassembly and replacement of the top block 5, and the disassembly and assembly method is relatively simple, thereby improving the disassembly and assembly efficiency.

[0031] Furthermore, the cylinder fixing plate 1, the cylinder support plate 2, the copper contact pad 3 and the top block 5 are all made of high-voltage resistant insulating materials to avoid the influence of current; in addition, these components are not provided with threaded holes, which ensures the connection strength when connected to each other, making the connection state stronger and more reliable.

[0032] Working principle: When using this switch, when the power is on, the control cylinder 4 extends and presses the top block 5 downward, so that the current connection block 6 contacts the copper contact 71 below, thereby energizing the copper bars 7 on both sides. During the contact process, the current connection block 6 will move up and down and shake on both sides, cooperating with the expansion and contraction of the spring 63, so as to be buffered and automatically leveled; when the power is off, the control cylinder 4 contracts and lifts the top block 5 upward, so that the current connection block 6 and the copper contact 71 are separated and disconnected, so that the current of the copper bars 7 on both sides is disconnected.

[0033] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention as claimed.

Claims

1. An IGBT device pneumatic switch, comprising a cylinder fixing plate (1), a cylinder support plate (2), a copper contact pad (3), a cylinder (4), a top block (5), a current connection block (6) and a copper contact pad (3); characterized in that: A lower notch (52) is provided at the bottom end of the top block (5), the current connection block (6) is located at the lower notch (52), and an upper notch (51) and a through slot (54) are provided at the top end of the top block (5) in order from top to bottom, wherein an embedded nut (56) is embedded in the through slot (54); A step bolt (61) passes through the bottom of the current connection block (6), wherein the step bolt (61) passes through the current connection block (6) and the embedded nut (56) of the top block (5) for threaded connection, so that the current connection block (6) can move up and down, wherein the diameter of the step bolt (61) is smaller than the diameter of the hole passing through the current connection block (6), so that the current connection block (6) can move on both sides.

2. The IGBT device pneumatic switch according to claim 1, characterized in that: A concave pit (55) is uniformly provided inwardly at a position corresponding to the lower notch (52) of the top block (5); a pin (62) is provided at a corresponding position of the current connection block (6); a certain distance exists between the pin (62) and the concave pit (55); and a spring (63) is provided on the periphery of the pin (62) between the concave pit (55) and the current connection block (6).

3. The IGBT device pneumatic switch according to claim 2, characterized in that: The copper contact pad (3) is evenly provided with mounting grooves (31), a copper busbar (7) is placed in the mounting groove (31), a fixing rod (72) is passed through one side of the copper busbar (7), and a copper contact (71) is provided at one end of the fixing rod (72), wherein the copper contact (71) is against the surface of the copper busbar (7), and the other end of the fixing rod (72) passes through the copper contact pad (3) and is fixedly connected to a nut.

4. The IGBT device pneumatic switch according to claim 3, characterized in that: The bottom of the copper contact pad (3) is evenly threaded with a screw rod (73), and the screw rod (73) is threadedly connected to the other side of the top of the copper busbar (7).

5. The IGBT device pneumatic switch according to claim 4, characterized in that: The cylinder (4) output end is provided with a cylinder connection block (41), the cylinder connection block (41) is embedded in the upper notch (51), and the top block (5) has jacks (53) evenly formed at positions corresponding to the upper notch (51) on both sides, and positioning holes (411) evenly formed at positions corresponding to both sides of the cylinder connection block (41), the cylinder connection block (41) and the top block (5) are connected via a quick-connect connector (42), and the quick-connect connector (42) passes through the jack (53) and is inserted into the positioning hole (411).

6. The IGBT device pneumatic switch according to claim 5, characterized in that: The cylinder fixing plate (1), the cylinder supporting plate (2), the copper contact pad (3) and the top block (5) are all made of high-voltage resistant insulating materials.

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