A thyristor assembly in a magnetic stimulation therapy device

Abstract

This utility model belongs to the field of medical equipment technology, specifically relating to a thyristor component in a magnetic stimulation therapy device. It includes a bakelite board with a heat sink and a limiting plate. A thyristor element, a copper connector, and a diode are sequentially arranged between the heat sink and the limiting plate. The four corners of the limiting plate are connected to the heat sink by first bolts. The bakelite board has multiple first and second fixing holes. The first fixing holes are all oblong, and second bolts are threaded through each first fixing hole to connect to the bottom of the heat sink. Third bolts are threaded through each second fixing hole to connect to the bottom of the limiting plate. This utility model ensures the electrical connection between the thyristor and the diode through the copper connector, avoiding the loosening problem that can easily occur due to bakelite board deformation when using a terminal block structure. It also reduces the number of bolts needed to tighten the thyristor and shortens installation and adjustment time.

Description

Technical Field

[0001] This utility model belongs to the field of medical equipment technology, specifically relating to a thyristor component in a magnetic stimulation therapy device. Background Technology

[0002] Thyristor components are widely used in medical devices, such as the disc-shaped thyristor used in magnetic stimulation therapy equipment. A thyristor (SCR) is a high-power electrical component, also known as a triac. It has advantages such as small size, high efficiency, and long lifespan. As a power device, a thyristor component typically operates under high current and high voltage conditions in electrical circuits, generating a significant amount of heat. Effective heat dissipation directly affects the lifespan of the thyristor and the reliability of the entire electrical system. Due to size and cost limitations, the natural heat dissipation of a thyristor is insufficient for its intended use. Therefore, assisting in heat dissipation is essential for ensuring the normal operation of the thyristor and is currently a primary goal for engineers.

[0003] In magnetic stimulation devices, for example, a thyristor (SCR) in the form of a diode (or two SCRs) is used in conjunction with a disc-shaped SCR to form a thyristor assembly. The upper and lower planes of these two electronic components must be pressed flat and firmly against the lower heat sink and the upper terminal block, respectively, to ensure reliable electrical connections. Regarding the heat dissipation problem of thyristor assemblies in magnetic stimulation therapy devices, utility model patent CN215988717U discloses a thyristor assembly in a magnetic stimulation therapy device. It achieves effective heat dissipation by using a fan to blow air into the heat sink and out through a groove in the center of the heat sink. Furthermore, a first bakelite board and a reinforcing plate are stacked, with the first bakelite board serving as insulation and the reinforcing plate as a component to increase the pressing strength. Holes are made in the reinforcing plate and the first bakelite board for the terminal block to pass through, while preventing contact between the terminal block and the reinforcing plate. After being tightened with six studs and nuts, the upper and lower planes of the thyristor and diode are flat and firmly bonded to the heat sink and terminal block.

[0004] In the above solution, the mechanical strength of the first bakelite board is relatively poor, and the contact area between the first bakelite board and the terminal is small. The pressure at this location is high and it is prone to deformation, which can lead to the terminal loosening. This can easily cause problems such as the terminal not being able to fully fit with the thyristor or diode when pressing the terminal, resulting in excessive local current that can easily burn out the thyristor or diode. In addition, this fixing method uses a lot of screws and nuts, making it difficult to control the tightening force of different screws and nuts during the installation and tightening process. As a result, the pressing of the first bakelite board requires continuous installation, testing and correction, which takes a long time. Summary of the Invention

[0005] This invention addresses the problems of existing thyristor components, such as the small contact area between the bakelite board and the terminal block, which leads to deformation under high force and incomplete bonding between the terminal block and the thyristor element or diode during pressing. It also addresses the issues of the numerous screws and nuts used, resulting in prolonged installation and correction time. The invention provides a thyristor component for magnetic stimulation therapy devices that connects the thyristor element and diode to both sides of a copper connector, eliminating the need for a terminal block. The heat sink and limiting plate are fixed using the same bakelite board, allowing for pressing and fixing of the thyristor element and diode. This reduces the number of bolts required for pressing the thyristor element and diode, thus improving installation and correction speed.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A thyristor assembly in a magnetic stimulation therapy device includes a bakelite board. A heat sink is slidably mounted on the bakelite board, and a limiting plate is fixedly mounted thereon. A thyristor element and a diode are disposed between the heat sink and the limiting plate. A copper contact plate is disposed between the thyristor element and the diode, with their opposite ends contacting the heat sink and the limiting plate respectively. The four corners of the limiting plate are connected to the heat sink by first bolts. An insulating tube is fitted onto each of the first bolts. The thyristor element and the diode can be pressed together by the four first bolts. At the same time, a torque wrench can be used to gradually tighten the bolts diagonally to a certain force, effectively improving the efficiency of installation and calibration.

[0008] Preferably, the bakelite board has a plurality of first fixing holes and second fixing holes. The first fixing holes are all oblong holes. The length directions of the plurality of first fixing holes are parallel to each other and perpendicular to the limiting plate. A second bolt is inserted into each of the first fixing holes and threaded to the bottom of the heat sink. A third bolt is inserted into each of the second fixing holes and threaded to the bottom of the limiting plate. The thyristor and diode are pressed and fixed without tightening the second bolt. Then the heat sink is fixed by rotating the second bolt.

[0009] Preferably, the bakelite board is provided with a third fixing hole at each of its four corners for mounting and fixing the bakelite board.

[0010] Preferably, the heat sink is a block made of conductive material, and the limiting plate is a plate made of conductive material, ensuring strength and conductivity.

[0011] Preferably, the heat sink has multiple heat dissipation grooves on the side away from the silicon controlled rectifier element to increase the contact area with air and improve the heat dissipation effect.

[0012] Preferably, both the limiting plate and the wiring copper sheet are provided with wiring holes for energizing the thyristor and the diode.

[0013] Preferably, the bakelite board is also provided with a fan. The fan is located on the side of the heat sink away from the limiting plate and there is a gap between the fan and the heat sink. The fan disturbs the airflow at the heat sink position, accelerates the airflow, and improves the heat dissipation effect.

[0014] The beneficial effects of this utility model through the above technical solution are as follows:

[0015] 1. Compared with the prior art, this utility model eliminates the use of terminals and avoids the need for screws, nuts or bolts to fit the bakelite board when pressing the thyristor and diode. On the one hand, it avoids the problem of insufficient contact between the terminals and the thyristor or diode due to small contact area, high pressure, easy deformation and loosening, which can lead to excessive local current and damage to the diode or thyristor. On the other hand, it avoids the problem of uneven force on the thyristor or diode due to deformation of the bakelite board, which affects the electrical performance.

[0016] 2. Compared with the prior art, this utility model reduces the number of bolts used when pressing the thyristor and diode. Compared with the existing six screws and nuts, this utility model only requires four first bolts to complete the pressing and fixing. At the same time, with the help of a torque wrench, the bolts are tightened diagonally to the same force, which effectively ensures that the thyristor or diode is subjected to uniform force after pressing, reduces the time for installation, testing and calibration, and improves efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the structure of the bakelite board of this utility model in conjunction with the second and third bolts.

[0019] Figure 3 This is a schematic diagram of the structure of the bakelite board of this utility model.

[0020] The following are the labels in the attached diagram: 1 is bakelite board, 2 is heat sink, 3 is limiting plate, 4 is thyristor, 5 is diode, 6 is first bolt, 7 is insulating tube, 8 is first fixing hole, 9 is second fixing hole, 10 is second bolt, 11 is third bolt, 12 is third fixing hole, 13 is heat dissipation groove, 14 is wiring copper piece, 15 is wiring hole, and 16 is fan. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0022] like Figures 1-3As shown, this embodiment provides a thyristor component in a magnetic stimulation therapy device, including a bakelite board 1. Each of the four corners of the bakelite board 1 is provided with a third fixing hole 12 for mounting and fixing the bakelite board 1. A heat sink 2 is slidably disposed on the bakelite board 1 and a limiting plate 3 is fixedly disposed thereon. The heat sink 2 is a block made of conductive material, and the limiting plate 3 is a plate made of conductive material. Specifically, the heat sink 2 is an aluminum alloy profile, and the limiting plate 3 is an aluminum alloy plate, which ensures both sufficient strength and resistance to deformation, as well as ensuring its conductivity.

[0023] A thyristor element 4 and a diode 5 are disposed between the heat sink 2 and the limiting plate 3. The diode 5 can also be another thyristor element. A copper connecting piece 14 is disposed between the thyristor element 4 and the diode 5, with the ends of the copper connecting piece 14 contacting the heat sink 2 and the limiting plate 3 respectively. The copper connecting piece 14 is pressed between the thyristor element 4 and the diode 5 to ensure the electrical connection between them. The thyristor element 4 and the diode 5 are pressed and fixed between the heat sink 2 and the limiting plate 3. The four corners of the limiting plate 3 are connected to the heat sink 2 by first bolts 6. An insulating tube 7 is sleeved on the first bolt 6. The heat sink 2 and the limiting plate 3 are fixedly connected together by the four first bolts 6. The heat sink 2 has screw holes. The first bolts 6 pass through the limiting plate 3 and are screwed into the corresponding screw holes. The first bolts 6 can also be replaced by a screw and nut connection method.

[0024] The bakelite board 1 has multiple first fixing holes 8 and second fixing holes 9. The first fixing holes 8 are all oblong holes. The length directions of the multiple first fixing holes 8 are parallel to each other and perpendicular to the limiting plate 3. A second bolt 10 is inserted into each of the first fixing holes 8 and threaded to the bottom of the heat sink 2. A third bolt 11 is inserted into each of the second fixing holes 9 and threaded to the bottom of the limiting plate 3. During installation, the limiting plate 3 is fixed by tightening the third bolt 11 upwards, while the second bolt 10 is screwed into the bottom of the heat sink 2 but not tightened. After the thyristor element 4 and diode 5 are pressed and fixed by the first bolt 6, the second bolt 10 is tightened to fix the heat sink 2. The first fixing holes 8 and the second fixing holes 9 are countersunk holes. The depth of the countersunk holes is more than 2 mm away from the bottom of the bakelite board 1 after the corresponding second bolt 10 or third bolt 11 is tightened, which is used for applying glue for insulation.

[0025] Both the limiting plate 3 and the connecting copper plate 14 are provided with wiring holes 15. After being powered on, they form two circuits: one is connecting copper plate 14-thyristor element 4-heat sink 2-first bolt 6-limiting plate 3, and the other is connecting copper plate 14-diode 5 (or another thyristor element)-limiting plate 3, that is, the thyristor element 4 and the diode 5 (or another thyristor element) are connected in parallel.

[0026] The heat sink 2 has multiple heat dissipation grooves 13 on the side away from the silicon controlled rectifier element 4. The heat dissipation grooves 13 increase the contact area between the heat sink 2 and the air. The bakelite board 1 is also provided with a fan 16. The fan 16 is located on the side of the heat sink 2 away from the limiting plate 3 and there is a gap between the fan 16 and the heat sink 2. The gap is an electrical insulation gap of more than 8mm. The fan 16 blows air into the heat sink 2 and blows it out through the heat dissipation grooves 13, thus carrying away the heat of the heat sink 2.

[0027] During installation, insert the third bolt 11 from the bottom of the bakelite board 1 upwards into the second fixing hole 9 and screw it into the bottom of the limiting plate 3. Tighten the limiting plate 3. Insert the second bolt 10 from the bottom of the bakelite board 1 upwards into the first fixing hole 8 and screw it into the bottom of the heat sink 2, but do not tighten it. Then, stack the thyristor element 4, the copper wiring piece 14, and the diode 5 in sequence and place them in the center between the heat sink 2 and the limiting plate 3. Then, install the four first bolts 6 and insert them into the corresponding insulating tubes 7. Tighten the first bolts 6 diagonally and adjust the thyristor element 4 midway. The three components, copper contact plate 14 and diode 5, are aligned with the distances between them and the four first bolts 6. Finally, a torque wrench is used to gradually tighten the four first bolts diagonally to a certain force (during this process, since the first fixing hole 8 is an oblong hole and the second bolt 10 is not tightened, the heat sink 2 can move towards or away from the limiting plate 3). Then, the second bolt 10 is tightened to fix the heat sink 2, and insulating glue is injected into the bottom of the second fixing hole 10 and the third fixing hole 11 so that the countersunk hole is flush with the bottom of the bakelite board 1.

[0028] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the patent claims of this utility model should be included within the scope of the patent application of this utility model.

Claims

1. A thyristor assembly in a magnetic stimulation therapy device, characterized by, The device includes a bakelite board (1), on which a heat sink (2) is slidably disposed and a limiting plate (3) is fixedly disposed. A thyristor element (4) and a diode (5) are disposed between the heat sink (2) and the limiting plate (3). A copper wire (14) is disposed between the thyristor element (4) and the diode (5), with the far ends of the two wires respectively contacting the heat sink (2) and the limiting plate (3). The four corners of the limiting plate (3) are connected to the heat sink (2) by a first bolt (6), and an insulating tube (7) is sleeved on the first bolt (6).

2. A thyristor assembly in a magnetic stimulation therapy device according to claim 1, wherein The bakelite board (1) has multiple first fixing holes (8) and second fixing holes (9). The first fixing holes (8) are all oblong holes. The length directions of the multiple first fixing holes (8) are parallel to each other and perpendicular to the limiting plate (3). The first fixing holes (8) are all fitted with second bolts (10) and threaded to the bottom of the heat sink (2). The second fixing holes (9) are all fitted with third bolts (11) and threaded to the bottom of the limiting plate (3).

3. A thyristor assembly in a magnetic stimulation therapy device according to claim 1, wherein The bakelite board (1) has a third fixing hole (12) at each of its four corners for mounting and fixing the bakelite board (1).

4. A thyristor assembly in a magnetic stimulation therapy device according to claim 1, wherein The heat sink (2) is a block made of conductive material, and the limiting plate (3) is a plate made of conductive material.

5. A thyristor assembly in a magnetic stimulation therapy device according to claim 1, wherein The heat sink (2) has multiple heat dissipation slots (13) on the side away from the silicon controlled rectifier (4).

6. A thyristor assembly in a magnetic stimulation therapy device according to claim 4, wherein Both the limiting plate (3) and the wiring copper sheet (14) are provided with wiring holes (15).

7. A thyristor assembly in a magnetic stimulation therapy device according to claim 1, wherein A fan (16) is also provided on the bakelite board (1). The fan (16) is located on the side of the heat sink (2) away from the limiting plate (3) and there is a gap between the fan (16) and the heat sink (2).

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