Novel converter valve assembly press-fitting structure and method

Abstract

The invention discloses a novel converter valve assembly press-fitting structure and method, and relates to the technical field of direct current power transmission. The structure comprises a positioning and supporting insulating plate (3), pressing plates (4 and 8), a disc spring structure (9), a fastening structure (10) and a retaining nut (11), the inner side faces of the pressing plate (4) and the pressing plate (8) are opposite, and the two ends of the positioning and supporting insulation plate (3) are fixed to the same sides of the pressing plate (4) and the pressing plate (8) respectively. When the valve string is pressed, the positioning and supporting insulating plate (3) supports the valve string, and the centers of the radiator (5), the power electronic device (6), the pressing plate (4) and the pressing plate (8) in the valve string are on the same straight line. According to the device, multiple devices on the valve string can be pressed at the same time, the pressing efficiency is high, the valve string devices and the center of a radiator can be kept on the same straight line, the control precision is high, when the devices are replaced, operation is directly conducted on a valve layer, only damaged devices are replaced, the valve string does not need to be wholly replaced, and the disassembly and assembly time and the equipment cost are saved.

Description

Technical Field

[0001] The invention relates to the technical field of direct current power transmission, and in particular to a novel press-fitting structure and method for a converter valve assembly. Background Art

[0002] The converter valve is the core equipment of the DC transmission project, and its value accounts for about 1 / 4 of the total price of the converter station complete set of equipment. The converter valve is mainly composed of components composed of thyristors, IGBTs, IGCTs and heat sinks. At present, the press-fitting method of the converter valve assembly (valve string) mostly adopts the form of manual hydraulic pump, which has cumbersome procedures, and when the valve assembly (valve string) applies the pressing force, the device and the heat sink need to be on the same center line. The repeated adjustment of the manual method is difficult to control the accuracy, which affects the quality stability. At the same time, the production efficiency is low, the number of converter valve assemblies (valve strings) in the project is huge, and mass production faces huge pressure. For example, the existing semiconductor valve string press-fitting structure and press-fitting method need to be carried out on a special rack, and the number and order of the semiconductor support seat and the heat sink support seat are consistent with the number and order of the corresponding devices in the semiconductor valve string to be pressed. The overall press-fitting device has many parts, high cost, large volume, and occupies a lot of area. At the same time, only one valve string can be pressed before the next one. After the valve string is crimped, it still needs to be hoisted into the valve layer and installed in place, which is time-consuming and labor-intensive. Summary of the invention

[0003] In order to solve the above problems, the inventors have made the present invention, and provide a new type of press-fitting structure and method of a converter valve assembly through a specific implementation method.

[0004] In a first aspect, an embodiment of the present invention provides a novel press-fit structure of a converter valve assembly, comprising:

[0005] Positioning support insulating plate, left pressure plate, right pressure plate, disc spring structure, fastening structure and retaining nut;

[0006] The inner side surfaces of the right pressing plate and the left pressing plate are opposite to each other, and the two ends of the positioning support insulating plate are respectively fixed on the same side of the right pressing plate and the left pressing plate;

[0007] The positioning support insulating plate supports the valve string, and the centers of the radiator and power electronic devices in the valve string, the right pressure plate and the left pressure plate are in the same straight line;

[0008] One side of the disc spring structure is installed on the inner side of the left pressure plate, the other side of the disc spring structure applies pressure to one side of the valve string, and one side of the fastening structure applies pressure to the other side of the valve string. The other side of the fastening structure is a screw rod, and the retaining nut is sleeved on the screw rod. When the valve string is pressed and installed, the retaining nut is pressed tightly against the inner side of the right pressure plate.

[0009] Specifically, the plane where the right pressing plate is located is parallel to the plane where the left pressing plate is located, and the centers of the right pressing plate and the left pressing plate coincide with each other in a vertical direction of any of the planes.

[0010] Specifically, the novel converter valve assembly press-fit structure further includes: an insulating pull rod, and two ends of the insulating pull rod are respectively connected to the right pressure plate and the left pressure plate.

[0011] Specifically, four relative positions of the right pressing plate and the left pressing plate are respectively connected to four insulating pull rods.

[0012] Specifically, a limiting groove is provided on the positioning support insulating plate, the limiting groove supports the radiator and the power electronic device in the valve string, and limits the centers of the radiator and the power electronic device in the valve string, the right pressure plate and the left pressure plate to be on the same straight line, and limits the position of the valve string in a direction parallel to the inner side surface of the right pressure plate or the left pressure plate;

[0013] The limiting groove is concave or hollow in the middle.

[0014] Specifically, there are two device positioning pins on the radiator, which define the centers of the radiator and the power electronic devices in the valve string to be on the same straight line, and define the positions of adjacent power electronic devices in a direction parallel to the inner side of the right pressure plate or the left pressure plate.

[0015] Specifically, the radiator and the power electronic device are arranged adjacent to each other, and the radiators are located on both sides of the valve string.

[0016] Specifically, the novel converter valve assembly press-fit structure further includes: a pressing tool installed on the outer side of the right pressing plate;

[0017] When the valve string is press-assembled, the separate hydraulic cylinder is installed on the inner side of the pressing tooling, and pressure is applied to the fastening structure through the center hole of the right pressure plate. When the set pressure is reached, the retaining nut is adjusted to press the retaining nut against the inner side of the right pressure plate.

[0018] Specifically, when the drive of the power electronic device and the power electronic device are not installed separately, the new type of converter valve assembly press-fit structure also includes: a positioning pin for the device drive, which is installed on the drive side of the power electronic device to support the corresponding drive and prevent the corresponding drive from rotating.

[0019] Specifically, the right pressure plate and the left pressure plate are respectively installed on two valve layer cross beams of the same valve layer.

[0020] In a second aspect, an embodiment of the present invention provides a novel converter valve assembly press-fitting method, characterized in that a disc spring structure, a valve string, and a fastening structure of the novel converter valve assembly press-fitting structure are installed in sequence; one side of the disc spring structure is installed on the inner side of the left pressure plate, the other side of the disc spring structure applies pressure to one side of the valve string, and one side of the fastening structure applies pressure to the other side of the valve string, and the other side of the fastening structure is a screw, a retaining nut is sleeved on the screw, and when the valve string is press-fitted, the retaining nut is pressed tightly against the inner side of the right pressure plate;

[0021] The novel converter valve assembly press-fitting structure includes a positioning support insulating plate, a left pressure plate, a right pressure plate, a disc spring structure, a fastening structure and a retaining nut; the inner side surfaces of the right pressure plate and the left pressure plate are opposite to each other, and the two ends of the positioning support insulating plate are respectively fixed on the same side of the right pressure plate and the left pressure plate; when the valve string is press-fitted, the positioning support insulating plate supports the valve string, and the centers of the radiator and power electronic devices in the valve string, and the right pressure plate and the left pressure plate are on the same straight line.

[0022] The beneficial effects of the above technical solution provided by the embodiment of the present invention include at least:

[0023] The novel converter valve assembly press-fitting structure proposed in the present invention can press-fit multiple devices on the valve string at the same time, with high press-fitting efficiency, and through positioning support, the centers of the valve string devices and the radiator are kept in the same straight line, with high control accuracy, and can be directly installed on the valve layer of the converter valve, and without disassembling from the valve layer, the pressure is released to replace the damaged device, and then press-fit. When replacing the device, there is no need to disassemble the valve string from the valve layer, nor is there any need to replace the valve string as a whole, which improves the device press-fitting efficiency, saves disassembly and assembly time and equipment costs, and improves equipment utilization.

[0024] The novel converter valve assembly press-fitting method proposed in the present invention can press-fit multiple devices on the valve string at the same time, with high press-fitting efficiency, and through positioning support, the centers of the valve string devices and the radiator are kept in the same straight line, with high control accuracy, and can be directly installed on the valve layer of the converter valve, and without disassembling from the valve layer, the pressure is released to replace the damaged device, and then press-fit. When replacing the device, there is no need to disassemble the valve string from the valve layer, nor is there any need to replace the valve string as a whole, which improves the device press-fitting efficiency, saves disassembly and assembly time and equipment costs, and improves equipment utilization.

[0025] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

[0026] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0028] Figure 1 It is a rear view of a new type of press-fit structure of a converter valve assembly in an embodiment of the present invention;

[0029] Figure 2It is a right view of a new type of press-fit structure of a converter valve assembly in an embodiment of the present invention;

[0030] Figure 3 This is a front view of a new type of press-fit structure of a converter valve assembly in an embodiment of the present invention;

[0031] Figure 4 This is one of the side views of a new type of press-fit structure of a converter valve assembly in an embodiment of the present invention;

[0032] Figure 5 It is a left view of a new type of press-fit structure of a converter valve assembly in an embodiment of the present invention;

[0033] Figure 6 A top view of a press-fit structure of a novel converter valve assembly in an embodiment of the present invention;

[0034] Figure 7 This is the second side view of a new type of press-fit structure of a converter valve assembly in an embodiment of the present invention.

[0035] Figure markings: 1-valve layer crossbeam, 2-insulating pull rod, 3-positioning support insulating plate, 4-pressure plate, 5-radiator, 6-power electronic device, 7-positioning pin for device, 8-pressure plate, 9-disc spring structure, 10-fastening structure, 11-retaining nut, 12-clamping tool, 13-positioning pin for device driving. DETAILED DESCRIPTION

[0036] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0037] In order to solve the problems existing in the prior art, an embodiment of the present invention provides a novel press-fitting structure and method for a converter valve assembly.

[0038] The embodiment of the present invention provides a novel press-fit structure of a converter valve assembly, the structure of which is as follows: Figures 1 to 7 As shown, it includes: a positioning support insulating plate 3, a pressing plate 4, a pressing plate 8, a disc spring structure 9, a fastening structure 10 and a retaining nut 11;

[0039] The inner side surfaces of the pressing plate 4 and the pressing plate 8 are opposite to each other, and the two ends of the positioning support insulating plate 3 are fixed on the same side of the pressing plate 4 and the pressing plate 8 respectively;

[0040] When the valve string is press-fitted, the positioning support insulating plate 3 supports the valve string, and the centers of the heat sink 5 and the power electronic device 6, the pressing plate 4 and the pressing plate 8 in the valve string are in the same straight line; multiple devices on the valve string can be press-fitted at the same time, and the press-fitting efficiency is high. Moreover, through the positioning support, the centers of the valve string devices and the heat sink are kept in the same straight line, and the control accuracy is high. The power electronic device 6 can be specifically a thyristor, an IGBT, an IGCT, etc.

[0041] One side of the disc spring structure 9 is installed on the inner side of the pressure plate 8, and the other side of the disc spring structure 9 applies pressure to one side of the valve string, and one side of the fastening structure 10 applies pressure to the other side of the valve string. The other side of the fastening structure 10 is a screw rod, and the retaining nut 11 is sleeved on the screw rod. When the valve string is pressed, the retaining nut 11 is pressed tightly against the inner side of the pressure plate 4. Optionally, as Figure 6 As shown, a stress uniform anti-skid structure is provided between the disc spring structure 9 and the valve string, so that the pressure of the disc spring structure 9 on the outside of the valve string is evenly distributed, and relative sliding between the disc spring structure 9 and the outside of the valve string is prevented. At the same time, a stress uniform anti-skid structure is provided between the fastening structure 10 and the valve string, so that the pressure of the fastening structure 10 on the outside of the valve string is evenly distributed, and relative sliding between the fastening structure 10 and the outside of the valve string is prevented, thereby avoiding the pressure applied to the outside of the valve string from being concentrated in a smaller area, causing damage or sliding of the valve string components.

[0042] In some specific embodiments, the plane where the pressing plate 4 is located is parallel to the plane where the pressing plate 8 is located, and the centers of the pressing plate 4 and the pressing plate 8 coincide with each other in a vertical direction of any of the planes.

[0043] In some specific embodiments, the novel converter valve assembly press-fit structure further includes: an insulating pull rod 2, and two ends of the insulating pull rod 2 are respectively connected to a pressing plate 4 and a pressing plate 8.

[0044] In some specific embodiments, four relative positions of the pressing plate 4 and the pressing plate 8 are respectively connected to four insulating pull rods 2 .

[0045] In some specific embodiments, there is a limiting groove on the positioning support insulating plate 3. When the valve string is pressed, the limiting groove supports the radiator 5 and the power electronic device 6 in the valve string, and limits the centers of the radiator 5 and the power electronic device 6, the pressing plate 4 and the pressing plate 8 in the valve string to be on the same straight line, and limits the position of the valve string in a direction parallel to the inner side surface of the pressing plate 4 or the pressing plate 8;

[0046] The limiting groove is concave or hollow in the middle.

[0047] In some specific embodiments, there are two device positioning pins 7 on the radiator 5, which limit the centers of the radiator 5 and the power electronic devices 6 in the valve string to be on the same straight line, and limit the positions of adjacent power electronic devices 6 in a direction parallel to the inner side of the pressure plate 4 or the pressure plate 8.

[0048] In some specific embodiments, the radiator 5 and the power electronic device 6 are arranged adjacent to each other, and the radiator 5 is located on both sides of the valve string.

[0049] In some specific embodiments, the novel flow-converting valve assembly pressing structure further includes: a clamping tool 12, which is installed on the outer side of the pressure plate 4, and the pressure plate 4 is provided with a clamping tool mounting hole; when the valve string is pressed, a separate hydraulic cylinder is installed on the inner side of the clamping tool 12, and pressure is applied to the fastening structure 10 through the center hole of the pressure plate 4. When the set pressure is reached, the retaining nut 11 is adjusted to press the retaining nut 11 against the inner side of the pressure plate 4.

[0050] In some specific embodiments, when the driver of the power electronic device 6 is not installed separately from the power electronic device 6, such as an IGCT designed to be integrated with the driver, the novel converter valve assembly press-fit structure further includes: a device driver positioning pin 13, which is installed on the driver side of the power electronic device 6 to support the corresponding driver and prevent the corresponding driver from rotating. For power electronic devices (such as thyristors, IGBTs, etc.) separated from their drivers, the device driver positioning pin 13 is not required.

[0051] In some specific embodiments, the pressing plate 4 and the pressing plate 8 are respectively installed on two valve layer cross beams 1 of the same valve layer. They can be directly installed on the valve layer of the converter valve, and without disassembling from the valve layer, the pressure is released to replace the damaged components, and then press-fit. When replacing the components, there is no need to disassemble the valve string from the valve layer, nor is there a need to replace the valve string as a whole, which improves the efficiency of component press-fitting, saves disassembly and assembly time and equipment costs, and improves equipment utilization.

[0052] The insulating materials selected for the positioning support insulating plate 3, the device positioning pins 7, and the device driving positioning pins 13 all have flame retardant properties, meet the fire protection grade UL 94V-0, and have self-extinguishing properties.

[0053] In a specific embodiment, the new converter valve assembly press-fit structure is installed on the valve layer cross beam 1, and the valve layer cross beam 1 is provided with a mounting hole for supporting and fixing the valve assembly to be press-fitted. In this embodiment, the valve assembly includes 4 insulating rods 2, a right pressure plate 4, a radiator 5, a power electronic device 6, a left pressure plate 8, a disc spring structure 9, a fastening structure 10 and a retaining nut 11. In this embodiment, the 4 insulating rods 2, the right pressure plate 4 and the left pressure plate 8 are first connected by bolts, and then fixed to the specified position of the valve layer cross beam 1; the positioning support insulating plate 3 is horizontally fixed to the lower side of the right pressure plate 4 and the left pressure plate 8 by bolts, and its function is to realize that all radiators 5 are supported on the same plane, and at the same time, the limiting groove on the positioning support insulating plate 3 ensures that the center positions of the radiator 5 and the right pressure plate 4 and the left pressure plate 8 are on the same horizontal line, so that the radiator 5 can only move in the direction of the horizontal line; two device positioning pins 7 are installed on the radiator 5 to realize that the center positions of the device IGCT and the radiator 5 are on the same horizontal line. The device drive locating pin 13 is installed on the drive side of the power electronic device 6 to support the drive to prevent it from rotating and ensure that all devices are in the same position. For power electronic devices that are separated from their drive (such as thyristors, IGBTs, etc.), there is no need to install the drive locating pin 13. The long rod side of the fastening structure 10 is a screw, and the retaining nut 11 is screwed to the appropriate position before installation. Install them in the order of disc spring structure 9, radiator 5, power electronic device 6, and fastening structure 10 from left to right, and pre-tighten the valve assembly by retaining the nut 11.

[0054] In the above embodiment, multiple devices on the valve string can be press-fitted at the same time, with high press-fitting efficiency. Through positioning support, the centers of the valve string devices and the radiator are kept in the same straight line, with high control accuracy and reliability. It can be directly assembled on the valve layer of the converter valve without taking up additional space. Without disassembling from the valve layer, the damaged device can be replaced by pressure relief and then press-fitted, which is easy to operate and solves the problems of many parts and high cost of the valve assembly press-fitting device. When replacing the device, there is no need to disassemble the valve string from the valve layer, nor is there any need to replace the valve string as a whole, which improves the device press-fitting efficiency, saves disassembly and assembly time and equipment costs, and improves equipment utilization.

[0055] Another embodiment of the present invention provides a new type of converter valve assembly press-fitting method, wherein the disc spring structure 9, valve string, and fastening structure 10 of the new type of converter valve assembly press-fitting structure are installed in sequence; one side of the disc spring structure 9 is installed on the inner side of the pressure plate 8, and the other side of the disc spring structure 9 applies pressure to one side of the valve string, and one side of the fastening structure 10 applies pressure to the other side of the valve string. The other side of the fastening structure 10 is a screw rod, and a retaining nut 11 is sleeved on the screw rod. When the valve string is press-fitted, the retaining nut 11 is pressed tightly against the inner side of the pressure plate 4.

[0056] The novel converter valve assembly press-fitting structure includes a positioning support insulating plate 3, pressure plates 4 and 8, a disc spring structure 9, a fastening structure 10 and a retaining nut 11; the inner side surfaces of the pressure plate 4 and the pressure plate 8 are opposite, and the two ends of the positioning support insulating plate 3 are respectively fixed on the same side of the pressure plate 4 and the pressure plate 8; when the valve string is press-fitted, the positioning support insulating plate 3 supports the valve string, and the centers of the heat sink 5 and the power electronic device 6 in the valve string, the pressure plate 4 and the pressure plate 8 are on the same straight line.

[0057] The specific steps of the novel press-fitting method for the converter valve assembly implemented in combination with the press-fitting structure are as follows: Figure 7 As shown, the clamping fixture 12 is fixedly connected by means of the threaded hole on the right side plate 4, and the fastening structure 10 is pressurized by means of a separate hydraulic cylinder to reach a set pressure, and then the nut 11 is rotated to keep in close contact with the right pressure plate 4, and the press fitting is completed. In order to ensure the reliability of the clamping force, the above operation can be repeated for a second check.

[0058] In the above embodiment, multiple devices on the valve string can be press-fitted at the same time, with high press-fitting efficiency. Through positioning support, the centers of the valve string devices and the radiator are kept in the same straight line, with high control accuracy. They can be directly assembled on the valve layer of the converter valve without taking up additional space. Without disassembling from the valve layer, the damaged device can be replaced by pressure relief and then press-fitted, solving the problems of many parts and high cost of the valve assembly press-fitting device. When replacing the device, there is no need to disassemble the valve string from the valve layer, nor is there any need to replace the valve string as a whole, which improves the device press-fitting efficiency, saves disassembly and assembly time and equipment costs, and improves equipment utilization.

[0059] Those skilled in the art can change the above sequence without departing from the protection scope of the present disclosure. Any modification, supplement and equivalent replacement made within the scope of the principle of the present invention shall still fall within the scope of the patent coverage of the present invention.

Claims

1. A new type of press-fit structure of a converter valve assembly, characterized in that: include: Positioning and supporting the insulating plate (3), the pressing plates (4, 8), the disc spring structure (9), the fastening structure (10) and the retaining nut (11); The inner side surfaces of the pressing plate (4) and the pressing plate (8) are opposite to each other, and the two ends of the positioning support insulating plate (3) are respectively fixed on the same side of the pressing plate (4) and the pressing plate (8); The positioning support insulating plate (3) supports the valve string, and the centers of the heat sink (5) and the power electronic device (6), the pressure plate (4) and the pressure plate (8) in the valve string are on the same straight line; One side of the disc spring structure (9) is installed on the inner side of the pressure plate (8), and the other side of the disc spring structure (9) applies pressure to one side of the valve string. One side of the fastening structure (10) applies pressure to the other side of the valve string. The other side of the fastening structure (10) is a screw rod, and the retaining nut (11) is sleeved on the screw rod. When the valve string is pressed and installed, the retaining nut (11) is pressed tightly against the inner side of the pressure plate (4).

2. The novel converter valve assembly press-fit structure according to claim 1 is characterized in that: The plane where the pressing plate (4) is located is parallel to the plane where the pressing plate (8) is located, and the centers of the pressing plate (4) and the pressing plate (8) coincide with each other in a vertical direction of any of the planes.

3. The novel converter valve assembly press-fit structure according to claim 1 is characterized in that: The novel converter valve assembly press-fit structure further comprises: an insulating pull rod (2), wherein two ends of the insulating pull rod (2) are respectively connected to a pressing plate (4) and a pressing plate (8).

4. The novel converter valve assembly press-fit structure according to claim 3 is characterized in that: Four insulating pull rods (2) are respectively connected to four relative positions of the pressing plate (4) and the pressing plate (8).

5. The novel converter valve assembly press-fit structure according to claim 1 is characterized in that: A limiting groove is provided on the positioning support insulating plate (3), the limiting groove supports the radiator (5) and the power electronic device (6) in the valve string, and limits the centers of the radiator (5) and the power electronic device (6) in the valve string, the pressing plate (4) and the pressing plate (8) to be on the same straight line, and limits the position of the valve string in a direction parallel to the inner side surface of the pressing plate (4) or the pressing plate (8); The limiting groove is concave or hollow in the middle.

6. The novel converter valve assembly press-fit structure according to claim 5 is characterized in that: The radiator (5) has two device positioning pins (7) for limiting the centers of the radiator (5) and the power electronic devices (6) in the valve train to be on the same straight line and for limiting the positions of adjacent power electronic devices (6) in a direction parallel to the inner side surface of the pressure plate (4) or the pressure plate (8).

7. The novel converter valve assembly press-fit structure according to claim 5 or 6, characterized in that: The radiator (5) and the power electronic device (6) are arranged adjacent to each other, and the radiator (5) is located on both sides of the valve string.

8. The novel converter valve assembly press-fit structure according to claim 1 is characterized in that: The novel converter valve assembly press-fit structure further comprises: a pressing tool (12) installed on the outer side of the pressing plate (4); When the valve string is pressed and assembled, the separate hydraulic cylinder is installed on the inner side of the pressing tool (12) and applies pressure to the fastening structure (10) through the center hole of the pressing plate (4). When the set pressure is reached, the retaining nut (11) is adjusted to press the retaining nut (11) and the inner side surface of the pressing plate (4).

9. The novel converter valve assembly press-fit structure according to claim 1 is characterized in that: When the drive of the power electronic device (6) and the power electronic device (6) are not installed separately, the novel converter valve assembly press-fit structure further includes: a device drive positioning pin (13), which is installed on the drive side of the power electronic device (6) and is used to support the corresponding drive and prevent the corresponding drive from rotating.

10. The novel converter valve assembly press-fit structure according to claim 1, characterized in that: The pressing plate (4) and the pressing plate (8) are respectively installed on two valve layer cross beams (1) of the same valve layer.

11. A novel method for pressing a converter valve assembly, characterized in that: The disc spring structure (9), valve string, and fastening structure (10) of the press-fit structure of the novel flow-converting valve assembly are installed in sequence; one side of the disc spring structure (9) is installed on the inner side of the pressure plate (8), the other side of the disc spring structure (9) applies pressure to one side of the valve string, and one side of the fastening structure (10) applies pressure to the other side of the valve string; the other side of the fastening structure (10) is a screw rod, and a retaining nut (11) is sleeved on the screw rod. When the valve string is press-fitted, the retaining nut (11) is pressed tightly against the inner side of the pressure plate (4); The novel converter valve assembly press-fitting structure comprises a positioning support insulating plate (3), a pressing plate (4, 8), a disc spring structure (9), a fastening structure (10) and a retaining nut (11); the inner side surfaces of the pressing plate (4) and the pressing plate (8) are opposite to each other, and the two ends of the positioning support insulating plate (3) are respectively fixed on the same side of the pressing plate (4) and the pressing plate (8); when the valve string is press-fitted, the positioning support insulating plate (3) supports the valve string, and the centers of the heat sink (5) and the power electronic device (6) in the valve string, the pressing plate (4) and the pressing plate (8) are on the same straight line.

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