Pressing device for high-power thyristors

Abstract

The utility model belongs to the technical field of power electronics equipment, especially relate to a press fitting device for high -power thyristor, including the top rod, disc spring, cushion block, adjustment pad, pressboard, fastening bolt, fixed bolt, a plurality of fastening bolts are connected with pressboard thread, fastening bolt bottom end bears on adjustment pad, and the bottom of adjustment pad is spherical convex structure, and the top of cushion block has spherical groove, and spherical convex structure is matched with spherical groove, and fixed bolt passes through adjustment pad, cushion block and top rod thread connection in proper order, and disc spring sets up between cushion block and top rod, and disc spring is connected with top rod sleeve. Advantages are: compact structure, provide fastening force when the silicon string of high -power thyristor composition is pressed tightly, utilize a plurality of fastening bolts to realize the multi -point force to thyristor, and the thyristor is pressed and installed in small space conveniently.

Description

Technical Field

[0001] This utility model belongs to the field of power electronic equipment technology, and in particular relates to a press-fitting device for high-power thyristors. Background Technology

[0002] Thyristors have wide applications in power electronics, where they can regulate voltage and power by controlling the phase of alternating current. During operation, multiple thyristors exhibit a phenomenon where the socket expands due to heat generation when energized and contracts due to cooling when de-energized. In practical applications, multiple thyristors are often arranged in silicon strings to meet high power demands, making this expansion and contraction phenomenon even more pronounced during operation. A clamping device is typically used to provide the clamping force. For example, patent application number 200520016923.2 discloses a disc spring clamping mechanism for mounting thyristors.

[0003] As power increases, thyristor platforms become larger, requiring clamping devices to provide greater tightening force. Existing clamping devices rely on a single bolt to bear the torque during tightening, and the excessive torque wrench requires significant turning space for operation. Substations cannot provide sufficient space, making them unsuitable for substation installation. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the purpose of this utility model is to provide a pressing device for high-power thyristors, which provides a clamping force when pressing silicon strings composed of high-power thyristors, and adopts multi-point force application to facilitate pressing thyristors in a small space.

[0005] To achieve the above objectives, this utility model employs the following technical solution:

[0006] A pressing device for high-power thyristors includes a push rod, a disc spring, a pad, an adjusting pad, a pressure plate, fastening bolts, and fixing bolts. Several fastening bolts are threadedly connected to the pressure plate. The bottom end of the fastening bolts abuts against the adjusting pad. The bottom of the adjusting pad has a spherical protrusion structure, and the top of the pad has a spherical groove. The spherical protrusion structure and the spherical groove are matched. The fixing bolts pass through the adjusting pad and the pad in sequence and are threadedly connected to the push rod. The disc spring is disposed between the pad and the push rod and is sleeved with the push rod.

[0007] The bottom of the top rod is a flat plate structure, and the top has a threaded blind hole.

[0008] Washers are provided between the disc springs, and the washers are fitted onto the top rod.

[0009] The pad has a groove at the bottom.

[0010] The top of the adjustment pad is provided with several countersunk holes.

[0011] The number of fastening bolts is at least three.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] A compact pressing device for high-power thyristors provides clamping force when pressing silicon strings composed of high-power thyristors. It utilizes multiple fastening bolts to apply force to the thyristors at multiple points, facilitating the pressing of thyristors within a limited space. Specific advantages include:

[0014] 1. Adding a shim in the middle of the disc spring can prevent disc spring installation defects caused by misalignment due to installation gaps between the upper and lower disc springs. Once the upper and lower disc springs are misaligned, the contact surfaces of the two disc springs change from circumferential contact to two-point contact, resulting in poor stress conditions on the disc springs, which can lead to disc spring breakage in severe cases.

[0015] 2. The multi-bolt structure distributes the tightening torque, facilitating on-site installation. The tightening force of this clamping device comes from the torque of the tightening bolts; excessive torque on a single bolt is detrimental to the operation of a torque wrench on-site.

[0016] 3. The adjusting pads and pads of this device adopt spherical contact surfaces, and use their rotating joints to transmit the tightening force, ensuring that the force on each fastening bolt is uniform and preventing individual bolts from being subjected to excessive force.

[0017] 4. The fastening force can be quickly adjusted by changing the number of disc spring pairs, achieving a systematic design. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] In the diagram: 1. Fastening bolt; 2. Pressure plate; 3. Adjusting shim; 4. Pad block; 5. Fixing bolt; 6. Disc spring; 7. Washer; 8. Top rod. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings. However, it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0021] See Figure 1A pressing device for high-power thyristors includes a push rod 8, a disc spring 6, a pad 4, an adjusting pad 3, a pressure plate 2, fastening bolts 1, and fixing bolts 5. Several fastening bolts 1 are threadedly connected to the pressure plate 2. The bottom ends of the fastening bolts 1 abut against the adjusting pad 3. The bottom of the adjusting pad 3 has a spherical protrusion structure, and the top of the pad 4 has a spherical groove. The spherical protrusion structure and the spherical groove cooperate to form a spherical rotating pair that can slide around a center, used to adjust the alignment of the pressure of multiple fastening bolts 1 and solve the problem of eccentricity caused by improper installation of individual fastening bolts 1. The fixing bolts 5 pass through the adjusting pad 3 and the pad 4 in sequence and are threadedly connected to the push rod 8. The disc spring 6 is located between the pad 4 and the push rod 8 and is sleeved with the push rod 8 to provide fastening force compensation. The pressure plate 2 and the silicon string frame form a rigid load-bearing structure, providing a guarantee of fastening force for the entire system.

[0022] The bottom of the push rod 8 is a flat plate structure with a threaded blind hole at the top and an external optical axis. Disc springs 6 are stacked on the flat plate structure with their front and back sides overlapping. The disc springs 6 are positioned by the flat plate structure and the spacer 4. The bottom surface of the flat plate structure abuts against the heat dissipation unit of the silicon string or the thyristor. Washers 7 are provided between the disc springs 6, and these washers 7 are fitted onto the push rod 8 to prevent misalignment of the upper and lower disc springs 6 due to installation gaps, thus avoiding installation defects.

[0023] The bottom center of the pad 4 has a groove that mates with the top of the push rod 8, which is inserted into the groove to limit its radial position. The top of the adjusting pad 3 has several countersunk holes. The fastening bolts 1 pass through the pressure plate 2 via threads and rest in the countersunk holes to provide fastening force. There are at least three fastening bolts 1 to distribute the large clamping force, thereby dispersing the fastening torque, reducing the length of the torque plate arm, and thus reducing the installation space.

[0024] During installation, the specified number of disc springs 6 are fitted onto the push rod 8 with their front and back sides overlapping, followed by the insertion of washers 7, and then the disc springs 6 are fitted on top to form a flexible pressure system. The optical shaft end of the push rod 8 is then inserted into the groove of the pad 4, and a fixing bolt 5 is passed through the adjusting pad 3. The pad 4 is then threadedly connected to the threaded blind hole of the push rod 8. The entire press-fitting device is now assembled.

[0025] In the overall silicon string installation, after the thyristor is installed, place this pressing device on one end of the thyristor, and the flat plate structure of the push rod 8 abuts against the thyristor. Screw the fastening bolt 1 on the pressure plate 2 into the countersunk hole of the adjusting shim 3, and screw in each fastening bolt 1 in sequence to apply a uniform tightening force. When the tightening force reaches the required level, the installation can be completed.

[0026] This utility model has a compact structure and provides a clamping force when pressing silicon strings composed of high-power thyristors. It uses multiple fastening bolts 1 to apply force to the thyristors at multiple points, which makes it convenient to press the thyristors in a small space.

[0027] Through the above specific embodiments, those skilled in the art can easily implement this utility model. However, it should be understood that this utility model is not limited to the specific embodiments described above. Based on the disclosed embodiments, those skilled in the art can arbitrarily combine different technical features to achieve different technical solutions. Due to space limitations and for the sake of brevity, these combined solutions have not been described one by one. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A press-fitting device for high-power thyristors, characterized in that, It includes a top rod, disc spring, pad, adjusting pad, pressure plate, fastening bolt, and fixing bolt. Several fastening bolts are threaded to the pressure plate. The bottom of the fastening bolt abuts against the adjusting pad. The bottom of the adjusting pad has a spherical protrusion structure. The top of the pad has a spherical groove. The spherical protrusion structure and the spherical groove are matched. The fixing bolt passes through the adjusting pad and the pad in sequence and is threaded to the top rod. The disc spring is set between the pad and the top rod and is sleeved with the top rod.

2. The pressing device for high-power thyristors according to claim 1, characterized in that, The bottom of the top rod is a flat plate structure, and the top has a threaded blind hole.

3. The pressing device for high-power thyristors according to claim 1, characterized in that, Washers are provided between the disc springs, and the washers are fitted onto the top rod.

4. The pressing device for high-power thyristors according to claim 1, characterized in that, The bottom of the pad has a groove.

5. The pressing device for high-power thyristors according to claim 1, characterized in that, The top of the adjustment pad is provided with several countersunk holes.

6. The pressing device for high-power thyristors according to claim 1, characterized in that, The number of fastening bolts is at least three.

Images