Magnetic resonance imaging fluxgate large-current gradient amplifier

Abstract

The utility model discloses a magnetic resonance imaging fluxgate large current gradient amplifier which comprises an amplifier body, the outer wall of the amplifier body is fixedly connected with a conduit, the outer wall of the conduit is fixedly connected with a shell, and the inner wall of the shell is provided with a groove body; according to the magnetic resonance imaging fluxgate high-current gradient amplifier, through cooperative use of a guide pipe, an air inlet groove, an annular plate, a heat dissipation fan, a fixing rod and a cover cylinder, cooling liquid is guided in through the guide pipe to conduct heat for the gradient amplifier in the use process of the gradient amplifier, and then wind power is generated through rotation of the heat dissipation fan; wind is guided into the gradient amplifier from the air inlet groove through the cover cylinder for heat dissipation, meanwhile, the wind enters the small diameter from the large diameter through the cover cylinder and is discharged, the flow speed of the wind is increased, the heat dissipation effect and efficiency of the gradient amplifier are improved, and the situation that internal components are damaged by heat generated by using the gradient amplifier is avoided; and therefore, the practicability of the gradient amplifier is improved to a certain extent.

Description

Technical Field

[0001] The utility model relates to the technical field related to gradient amplifiers, in particular to a magnetic resonance imaging fluxgate high-current gradient amplifier. Background Art

[0002] Magnetic resonance imaging is a medical diagnostic technology that uses the principle of nuclear magnetic resonance for imaging. In MRI systems, in order to generate a sufficiently strong magnetic field gradient, a high-current gradient amplifier is required. A fluxgate is a magnetic field sensor that can detect changes in the external magnetic field. In some special MRI systems, fluxgate technology may be used to monitor and control the stability of the magnetic field. A high-current gradient amplifier is a key component in an MRI system. Its function is to amplify the current to drive the gradient coil to generate the required magnetic field gradient. These gradient coils usually require very large currents (hundreds of amperes) to generate sufficient magnetic field gradients to spatially encode magnetic resonance signals during imaging. In general, an MRI fluxgate high-current gradient amplifier refers to a high-power current amplifier used to generate magnetic field gradients in an MRI system. It may be combined with fluxgate technology to monitor and control the magnetic field to ensure the accuracy and stability of the imaging process.

[0003] Existing gradient amplifiers generate a lot of heat during use, but most gradient amplifiers only have a single cooling system to dissipate the heat, resulting in poor heat dissipation and easily causing damage to components inside the gradient amplifier. Therefore, it is necessary to propose a magnetic resonance imaging fluxgate high current gradient amplifier. Utility Model Content

[0004] The utility model aims to provide a magnetic resonance imaging fluxgate high current gradient amplifier to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a magnetic resonance imaging fluxgate high current gradient amplifier, comprising an amplifier body, an outer wall of the amplifier body is fixedly connected to a conduit, an outer wall of the conduit is fixedly connected to a shell, an inner wall of the shell is provided with a groove, an air inlet groove is provided above the amplifier body, an inner side wall of the shell is fixedly connected to a support block, one side of the support block is fixedly connected to a ring plate, an inner wall of the ring plate is fixedly connected to a bracket, a cooling fan is fixedly connected to the inside of the bracket, a fixing rod is fixedly connected to the bottom of the ring plate, and a cover tube is fixedly connected to the outer wall of the fixing rod.

[0006] Preferably, the shape and size of the groove body match the shape and size of the conduit, and the shell is fixedly connected to the conduit through the groove body.

[0007] Preferably, a ventilation hole is opened on the top of the shell, a card slot is opened on the top of the shell, a reinforcement frame is movably connected to the top of the shell, a dustproof net is fixedly connected to the inner wall of the reinforcement frame, and a card block is fixedly connected to the bottom of the reinforcement frame.

[0008] Preferably, the shape and size of the ventilation hole match the shape and size of the dustproof net, and the ventilation hole is movably connected to the dustproof net.

[0009] Preferably, the shape and size of the card slot match the shape and size of the card block, and the reinforcement frame is movably connected to the shell through the card slot and the card block.

[0010] Preferably, there are a plurality of cover tubes, which are arranged below the fixing rod in a circular array with the center of the ring plate as the center and at equal distances.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. A magnetic resonance imaging fluxgate high-current gradient amplifier is used in conjunction with a conduit, an air inlet slot, a ring plate, a heat dissipation fan, a fixing rod and a cover tube. During the use of the gradient amplifier, a coolant is introduced through the conduit to conduct heat to the gradient amplifier, and then the rotation of the heat dissipation fan is used to generate wind force, and the wind is introduced from the air inlet slot into the interior of the gradient amplifier through the cover tube for heat dissipation. At the same time, the cover tube enters the wind force from the large diameter into the small diameter and discharges it, thereby increasing the wind force flow rate, accelerating the heat dissipation effect and efficiency of the gradient amplifier, and avoiding damage to internal components due to the heat generated by the use of the gradient amplifier, thereby improving the practicality of the gradient amplifier to a certain extent;

[0013] 2. This magnetic resonance imaging fluxgate high-current gradient amplifier, through the arrangement of the air inlet hole, the card slot, the reinforcement frame, the dust screen and the card block, facilitates the loading and unloading work between the reinforcement frame and the dust screen and the shell through the mutual engagement of the card slot and the card block during the use of the gradient amplifier, and is also convenient for the operator to clean the dust and impurities on the dust screen, thereby improving the subsequent heat dissipation effect of the gradient amplifier, thereby improving the applicability of the gradient amplifier to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the structure of hidden local parts of the utility model;

[0016] Figure 3 This is a schematic diagram of the connection structure between the support block and the cover cylinder of the utility model;

[0017] Figure 4This is a schematic diagram of the connection structure between the support block and the cover cylinder of the utility model;

[0018] Figure 5 This is a schematic diagram of the structure of hidden local parts of the utility model;

[0019] Figure 6 This is a schematic diagram of the connection structure between the reinforcement frame and the card block of the utility model;

[0020] Figure 7 This is a circuit system diagram of the utility model.

[0021] In the figure: 1. amplifier body; 2. duct; 3. shell; 4. slot body; 5. air inlet slot; 6. support block; 7. ring plate; 8. bracket; 9. cooling fan; 10. fixing rod; 11. cover tube; 12. ventilation hole; 13. card slot; 14. reinforcement frame; 15. dust net; 16. card block. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figure 1-7 The utility model provides a technical solution: a magnetic resonance imaging fluxgate high current gradient amplifier, comprising an amplifier body 1, an outer wall of the amplifier body 1 is fixedly connected with a conduit 2, an outer wall of the conduit 2 is fixedly connected with a shell 3, an inner wall of the shell 3 is provided with a slot 4, the shape and size of the slot 4 match the shape and size of the conduit 2, the shell 3 is fixedly connected with the conduit 2 through the slot 4, so that the shell 3 and the conduit 2 are closely fitted, so as to conduct the heat of the amplifier body 1, an air inlet slot 5 is provided above the amplifier body 1, an inner side wall of the shell 3 is fixedly connected with a support block 6, a side of the support block 6 is fixedly connected with a ring plate 7, an inner wall of the ring plate 7 is fixedly connected with a bracket 8, a heat dissipation fan 9 is fixedly connected inside the bracket 8, a fixing rod 10 is fixedly connected below the ring plate 7, a cover tube 11 is fixedly connected to the outer wall of the fixing rod 10, and the number of the cover tubes 11 is several, and the cover tubes 11 are arranged in a circular array with the center of the ring plate 7 as the center and at equal distances below the fixing rod 10, so as to expand the wind guiding area and improve the heat dissipation effect on the amplifier body 1.

[0024] See also Figure 1-7A ventilation hole 12 is provided on the top of the shell 3, and the shape and size of the ventilation hole 12 match the shape and size of the dustproof net 15. The ventilation hole 12 is movably connected to the dustproof net 15, which is convenient for the air intake of the cooling fan 9 and effectively improves the heat dissipation effect of the amplifier body 1. A card slot 13 is provided on the top of the shell 3, and the shape and size of the card slot 13 match the shape and size of the card block 16. The reinforcement frame 14 is movably connected to the shell 3 through the card slot 13 and the card block 16, which is convenient for loading and unloading between the reinforcement frame 14 and the shell 3, and convenient for the operator to clean the dustproof net 15. The top of the shell 3 is movably connected with the reinforcement frame 14, the inner wall of the reinforcement frame 14 is fixedly connected with the dustproof net 15, and the bottom of the reinforcement frame 14 is fixedly connected with the card block 16.

[0025] Working principle: When using the magnetic resonance imaging fluxgate high current gradient amplifier, first, the heat generated by the amplifier body 1 during operation is connected to the circulation system through the conduit 2, so that the coolant enters one end of the conduit 2, flows along the conduit 2 wrapped around the outer wall of the amplifier body 1, and is discharged from the other end of the conduit 2. At the same time, the cooling fan 9 is started and rotated to generate wind force. The wind force is guided by the cover tube 11, enters from the large diameter of the cover tube 11 and is discharged from the small diameter, thereby accelerating the wind flow rate, so that the greater the wind force entering the air inlet slot 5, the more heat is taken away. The reinforcement frame 14 is pulled out regularly to drive the block 16 at the bottom of the reinforcement frame 14 to detach from the block above the shell 3. Slot 13, to achieve the removal of dust net 15, convenient for cleaning impurities and dust on dust net 15, at the same time, the amplifier body 1 passes: fluxgate first is the current control and amplifier completely insulated and isolated, completely without common mode interference, current detection is the current passing through the gradient coil and the coil controlling the current coupled to the Hall element by the magnetic ring, and the feedback of the amplifier is realized by the coupling winding between the coils, and the magnetic field of the Hall element is kept zero, high voltage operational amplifier: amplifies the magnetic flux signal of the Hall element to high voltage; push-pull triode: converts the voltage of the high voltage operational amplifier into high current; magnetic ring: couples the control current and the current passing through the coil to the Hall element. The Hall element is placed in the gap of the magnetic ring; the Hall element: detects the magnetic flux of the magnetic ring; the above solves the problems of common mode interference and current detection in the existing magnetic resonance high current gradient amplifier, the model of the heat dissipation fan 9 is SY220V, and the use process of the magnetic resonance imaging fluxgate high current gradient amplifier is completed.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A magnetic resonance imaging fluxgate high current gradient amplifier, comprising an amplifier body (1), characterized in that: The outer wall of the amplifier body (1) is fixedly connected to a duct (2), the outer wall of the duct (2) is fixedly connected to a shell (3), the inner wall of the shell (3) is provided with a groove (4), the upper part of the amplifier body (1) is provided with an air inlet groove (5), the inner side wall of the shell (3) is fixedly connected to a support block (6), one side of the support block (6) is fixedly connected to a ring plate (7), the inner wall of the ring plate (7) is fixedly connected to a bracket (8), the interior of the bracket (8) is fixedly connected to a heat dissipation fan (9), the lower part of the ring plate (7) is fixedly connected to a fixing rod (10), and the outer wall of the fixing rod (10) is fixedly connected to a cover tube (11).

2. The magnetic resonance imaging fluxgate high current gradient amplifier according to claim 1, characterized in that: The shape and size of the groove body (4) match those of the conduit (2), and the housing (3) is fixedly connected to the conduit (2) via the groove body (4).

3. The magnetic resonance imaging fluxgate high current gradient amplifier according to claim 1, characterized in that: A ventilation hole (12) is provided on the top of the shell (3), a card slot (13) is provided on the top of the shell (3), a reinforcement frame (14) is movably connected to the top of the shell (3), a dustproof net (15) is fixedly connected to the inner wall of the reinforcement frame (14), and a card block (16) is fixedly connected to the bottom of the reinforcement frame (14).

4. The magnetic resonance imaging fluxgate high current gradient amplifier according to claim 3, characterized in that: The shape and size of the ventilation hole (12) and the shape and size of the dustproof net (15) match each other, and the ventilation hole (12) and the dustproof net (15) are movably connected.

5. The magnetic resonance imaging fluxgate high current gradient amplifier according to claim 3, characterized in that: The shape and size of the card slot (13) match the shape and size of the card block (16), and the reinforcement frame (14) is movably connected to the housing (3) via the card slot (13) and the card block (16).

6. The magnetic resonance imaging fluxgate high current gradient amplifier according to claim 1, characterized in that: The number of the cover cylinders (11) is several, and the cover cylinders (11) are arranged below the fixing rod (10) in an annular array with the center of the ring plate (7) as the center of the circle at equal distances.

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