Cold head installation container of superconducting magnetic resonance refrigerator

Abstract

The utility model relates to the technical field of low-temperature superconducting magnet refrigerator installation, and discloses a superconducting magnetic resonance refrigerator cold head installation container which comprises a cavity structure arranged on the lower portion of a cold head in a sleeved mode and fixedly connected with a magnetic resonance shell. The cavity structure comprises a heat dissipation component abutting against the first-stage cold head, a tubular structure connecting the magnetic resonance shell and the heat dissipation component and a vibration reduction and pressure relief structure arranged below the heat dissipation component, a second-stage cold head arranged in the cooling cavity is arranged at the lower end of the first-stage cold head, and the vibration reduction and pressure relief structure is connected with the cooling cavity and the heat dissipation component. The problems that in the prior art, a cold head is inconvenient to disassemble and assemble, a vacuum heat insulation layer of a superconducting magnet is prone to being damaged, normal operation of the cold head is affected, and magnetic resonance imaging is affected by vibration of a piston of the cold head are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to low temperature superconducting magnet refrigerator installation technical field, concretely relates to a superconducting magnetic resonance refrigerator cold head installation container. BACKGROUND

[0002] Magnetic resonance imaging is one of the most advanced medical diagnostic equipment in today's medical field, superconducting magnetic resonance has the advantages of high field strength, low power consumption, stable magnetic field uniformity and high signal-to-noise ratio, and the current superconducting material is mainly niobium titanium copper composite wire, and its working temperature is 4.2K;The main low temperature structure of superconducting magnet has magnet cold screen, liquid helium container, and superconducting coil is placed in liquid helium cavity;

[0003] The precooling of superconducting magnet generally uses refrigerator cold head or liquid nitrogen, liquid helium to cool the magnet cold screen and superconducting coil to its working temperature respectively;The existing superconducting magnetic resonance can be divided into cold head type and cold headless type, the cold headless type superconducting magnetic resonance maintains the low temperature superconducting environment by consuming liquid helium, because the temperature of liquid helium is nearly 300 degrees Celsius different from room temperature, it is very difficult to extract, so its price is very expensive, the cold head type superconducting magnetic resonance can effectively reduce the consumption of liquid helium through the refrigerator, and reduce the use cost, but the refrigerator cold head has a certain service life, when the refrigerator cold head needs to be maintained or replaced, the cold head needs to be disassembled, such as the announcement number for: CN202813865U discloses a refrigerator cold head mounting structure for magnetic resonance superconducting magnet, which is not convenient to disassemble and maintain in the later stage, and is easy to damage the vacuum insulation layer of the superconducting magnet, thereby affecting the normal operation of the cold head;At the same time, the vibration of the refrigerator cold head piston affects the magnetic resonance imaging;

[0004] Therefore, the existing cold head mounting structure needs to be improved by the technical personnel in the field. INVENTION CONTENTS

[0005] In view of the defects of the prior art, the utility model provides a kind of superconducting magnetic resonance refrigerator cold head installation container of the application, it is convenient to disassemble, ensure that vacuum insulation layer is not damaged and the vacuum sealing performance of cold head, simultaneously solve the influence of cold head vibration on imaging, also have certain pressure regulating function.

[0006] In order to realize the above-mentioned purpose, the following technical scheme is adopted in the present application.

[0007] The utility model discloses a superconducting magnetic resonance refrigerator cold head installation container, which comprises: a cavity structure sleeved on the lower part of the cold head and fixedly connected with the magnetic resonance shell, the cavity structure comprises: a heat dissipation member abutting against the primary cold head, a tubular structure connecting the magnetic resonance shell and the heat dissipation member, and a damping and pressure relief structure arranged below the heat dissipation member, the lower end of the primary cold head is provided with a secondary cold head placed in the cooling cavity, and the damping and pressure relief structure is connected with the cooling cavity and the heat dissipation member respectively.

[0008] Further improvement lies in that the heat dissipation member is provided with a hollow stepped structure, one end of the heat dissipation member is in sealing connection with the bottom of the tubular structure, the other end is in sealing connection with one end of the damping and pressure relief structure through a connecting flange, the heat dissipation member is internally provided with a flared conical structure matched with the primary cold head, and the other end of the damping and pressure relief structure is in sealing connection with the cooling cavity through a connecting flange.

[0009] Further improvement lies in that the heat dissipation member is provided with a copper flange structure.

[0010] Further improvement lies in that a transition flange is further arranged between the heat dissipation member and the connecting flange.

[0011] Further improvement lies in that the damping and pressure relief structure is provided with a telescopic metal bellows structure.

[0012] Further improvement lies in that the tubular structure is provided with a thin-walled cylindrical structure.

[0013] Further improvement lies in that a detachable mounting flange is further arranged between the cold head and the magnetic resonance shell, the top surface of the mounting flange is provided with a first sealing ring mounting groove and a connecting through hole, the first sealing ring in the first sealing ring mounting groove is in sealing installation with the end face flange of the cold head, the connecting through hole is in fastening connection with the magnetic resonance shell through a screw, and the outer side surface of the mounting flange is further provided with a second sealing ring mounting groove and is in sealing installation with the side wall of the magnetic resonance shell.

[0014] Compared with the prior art, the utility model has beneficial effects that:

[0015] The utility model discloses a cavity structure is formed through high temperature welding mode by setting tubular structure, heat dissipation member, damping and pressure relief structure and connecting flange, the primary cold head is in close contact with the heat dissipation member, the outer wall of heat dissipation member is directly contacted with magnet cold screen, the vacuum heat insulation layer where magnet cold screen is located is independent with cavity structure, when the refrigerator cold head is disassembled, only the primary cold head and heat dissipation member are separated, and the vacuum environment where magnet cold screen is located is not damaged, and since the flared conical structure matched with the primary cold head is arranged in the heat dissipation member, the taper surface cooperation is convenient and has automatic alignment guiding function, so that the dismounting is convenient and fast. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the schematic view of the cold head of the utility model.

[0017] Figure 2 It is the sectional structure schematic view of the utility model.

[0018] Figure 3 Is the flange installation and cold head and magnetic resonance shell amplification schematic diagram of the utility model.

[0019] Figure 4 Is a kind of implementation installation local schematic diagram of the utility model.

[0020] Figure identification:

[0021] Cold head 1, primary cold head 11, secondary cold head 12, cavity structure 2, tubular structure 21, heat dissipation component 22, damping pressure relief structure 23, connecting flange 24, transition flange 25, mounting flange 26, first sealing circle installation groove 261, second sealing circle installation groove 262, connecting through hole 263, cooling cavity 3, magnetic resonance shell 4. Specific embodiments

[0022] In order to deepen the understanding of the utility model, the utility model will be further described in detail below, and the embodiment is only used to explain the utility model, and does not constitute the limitation of the protection scope of the utility model.

[0023] In the description of the utility model, it is understood that the orientation or position relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated combination or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the utility model.

[0024] The utility model will be further described below according to the drawings and in combination with embodiments.

[0025] Figures 1-4The application discloses a superconducting magnetic resonance refrigerator cold head mounting container, which comprises a cavity structure 2 sleeved on the lower part of a cold head 1 and fixedly connected with a magnetic resonance shell 4, the cavity structure 2 comprises a heat dissipation member 22 abutting against a primary cold head 11, a tubular structure 21 connecting the magnetic resonance shell 4 and the heat dissipation member 22 and a damping pressure relief structure 23 arranged below the heat dissipation member 22, the lower end of the primary cold head 11 is provided with a secondary cold head 12 arranged in a cooling cavity 3, and the damping pressure relief structure 23 is connected with the cooling cavity 3 and the heat dissipation member 22 respectively; the heat dissipation member 22 is arranged in a hollow stepped structure, one end of the heat dissipation member 22 is sealingly connected with the bottom of the tubular structure 21, the other end is sealingly connected with one end of the damping pressure relief structure 23 through a connecting flange 24, a flared conical structure matched with the primary cold head 11 is arranged in the heat dissipation member 22, and the other end of the damping pressure relief structure 23 is sealingly connected with the cooling cavity 3 through the connecting flange 24; the cooling cavity 3 is provided with liquid helium; wherein the tubular structure 21, the heat dissipation member 22, the damping pressure relief structure 23 and the connecting flange 24 form an independent and sealed cavity structure 2 through high-temperature welding, the high-temperature welding can be high-temperature brazing or argon arc welding, and the vacuum sealing performance is ensured; the primary cold head 11 is in close contact with the heat dissipation member 22, the outer wall of the heat dissipation member 22 is directly in contact with a magnet cold screen, a vacuum heat insulation layer in which the magnet cold screen is arranged is independent of the cavity structure 2, when the refrigerator cold head 1 is disassembled, only the primary cold head 11 and the heat dissipation member 22 are separated, and the vacuum environment in which the magnet cold screen is arranged is not damaged; in addition, the heat dissipation member 22 is internally provided with the flared conical structure matched with the primary cold head 11, the conical surface cooperation is convenient and has an automatic alignment guiding function, so that the disassembly and assembly are convenient and fast; the damping pressure relief structure 23 is arranged in a telescopic metal bellows structure; the metal bellows structure is arranged at the bottom of the heat dissipation member 22, and due to the telescopic property, the metal bellows structure can effectively buffer the vibration generated by the movement of a refrigerator piston; meanwhile, when the liquid helium in a liquid helium cavity volatilizes, helium gas rises, is liquefied after contacting the secondary cold head of the refrigerator and then drops into the liquid helium cavity, and the cycle is repeated, so that the loss of the liquid helium is reduced; the welded bellows has the telescopic property, when a large amount of helium gas is gasified, the metal bellows is pulled up to increase the volume in the container to adjust and balance the pressure.

[0026] An optional implementation: the tubular structure 21 is arranged in a thin-walled cylindrical structure, and the thin-walled cylindrical structure can be made of stainless steel; the heat conduction of the primary cold head can be reduced, and the refrigeration efficiency of the primary cold head is improved.

[0027] An optional implementation: the heat dissipation member 22 is arranged in a copper flange structure.

[0028] An optional implementation: a transition flange 25 is further arranged between the heat dissipation member 22 and the connecting flange 24, so that the sealing connection of different materials is firm and reliable.

[0029] An optional implementation: as Figure 3As shown, the cold head 1 and the magnetic resonance shell 4 are further provided with a detachable mounting flange 26, the top surface of the mounting flange 26 is provided with a first sealing ring mounting groove 261 and a connecting through hole 263, the first sealing ring in the first sealing ring mounting groove 261 is sealingly mounted with the end surface flange of the cold head 1, the connecting through hole 263 is fastened and connected with the magnetic resonance shell 4 through screws, and the outer side surface of the mounting flange 26 is further provided with a second sealing ring mounting groove 262 and is sealingly mounted with the side wall of the magnetic resonance shell 4; the sealing rings in the first sealing ring mounting groove 261 and the second sealing ring mounting groove 262 can be O-rings, but are not limited to this; different sizes of mounting flanges 26 are selected to adapt to different models and different manufacturers of refrigerator equipment, and the adaptability is improved.

[0030] In conclusion, the refrigerator cold head is convenient to disassemble, the magnet vacuum thermal insulation layer is not damaged, the magnet cold screen has good cold conducting effect, the metal bellows structure is arranged, the problem that the magnetic resonance imaging is affected due to vibration of the refrigerator cold head is solved, the pressure balance in the container can be adjusted, the service life of the cold head is prolonged, the damage of liquid helium is reduced, and the use cost is reduced.

[0031] The embodiments of the utility model discloses the preferable embodiment, but is not limited to this, the ordinary skill in the art, the spirit of the utility model is appreciated according to the above-mentioned embodiment, and different extension and change are made, but as long as not departing from the spirit of the utility model, all are within the protection scope of the utility model.

Claims

1. A superconducting magnetic resonance refrigerator cold head mounting container, comprising: A cavity structure (2) is sleeved on the lower part of the cold head (1) and fixedly connected to the magnetic resonance shell (4), characterized in that: the cavity structure (2) includes: a heat dissipation component (22) abutting against the first-level cold head (11), a tubular structure (21) connecting the magnetic resonance shell (4) and the heat dissipation component (22), and a vibration reduction and pressure relief structure (23) arranged below the heat dissipation component (22); a second-level cold head (12) is provided at the lower end of the first-level cold head (11) and is placed in the cooling cavity (3); and the vibration reduction and pressure relief structure (23) is connected to the cooling cavity (3) and the heat dissipation component (22), respectively.

2. The cold head mounting container for a superconducting magnetic resonance refrigerator according to claim 1, characterized in that: The heat dissipation component (22) is configured as a hollow step structure. One end of the heat dissipation component (22) is sealedly connected to the bottom of the tubular structure (21), and the other end is sealedly connected to one end of the vibration-damping and pressure-reducing structure (23) via a connecting flange (24). A flared conical structure adapted to the first-stage cold head (11) is provided in the heat dissipation component (22), and the other end of the vibration-damping and pressure-reducing structure (23) is sealedly connected to the cooling chamber (3) via a connecting flange (24).

3. The cold head mounting container for a superconducting magnetic resonance refrigerator according to claim 2, characterized in that: The heat dissipation component (22) is configured as a copper flange structure.

4. The cold head mounting container for a superconducting magnetic resonance refrigerator according to claim 3, characterized in that: A transition flange (25) is further provided between the heat dissipation component (22) and the connecting flange (24).

5. The cold head mounting container for a superconducting magnetic resonance refrigerator according to claim 2, characterized in that: The vibration reduction and pressure relief structure (23) is configured as a retractable metal bellows structure.

6. The cold head mounting container for a superconducting magnetic resonance refrigerator according to claim 2, characterized in that: The tubular structure (21) is configured as a thin-walled cylindrical structure.

7. The cold head mounting container for a superconducting magnetic resonance refrigerator according to any one of claims 1 to 6, characterized in that: A detachable mounting flange (26) is further provided between the cold head (1) and the magnetic resonance shell (4); a first sealing ring mounting groove (261) and a connecting through hole (263) are provided on the top surface of the mounting flange (26); a first sealing ring in the first sealing ring mounting groove (261) is sealed and mounted with the end face flange of the cold head (1); the connecting through hole (263) is fastened to the magnetic resonance shell (4) by screws; a second sealing ring mounting groove (262) is further provided on the outer side surface of the mounting flange (26) for sealing and mounting with the side wall of the magnetic resonance shell (4).

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