Superconducting magnet one-way pressure relief safety valve

Abstract

The utility model discloses a superconducting magnet one-way pressure relief safety valve, and belongs to the field of pressure relief safety valves. A step is prefabricated on one side of the valve body and used for welding a KF25 connecting pipe, and the other side of the valve body is used for being connected with a connecting sleeve. Internal threads are prefabricated on one side of the connecting sleeve and used for being connected with the valve body, and internal threads are prefabricated on the other side of the connecting sleeve and used for adjusting the stroke of the jacking nut; a round step is prefabricated on one side of the valve element and used for fixing the O-shaped silicon rubber sealing ring, a counter bore is prefabricated on the other side of the valve element and used for positioning the spring, and a plurality of through holes are evenly prefabricated in the radial direction of the counter bore and used for deflating; through external threads are prefabricated on the outer diameter of the jacking nut and used for positioning the spring, through holes are prefabricated on the other side of the jacking nut and used for deflating, and a plurality of deep grooves which are evenly distributed are prefabricated and used for adjusting the stroke of the jacking nut; the spring is used for providing jacking force for the O-shaped silicon rubber sealing ring in a pre-tightening mode. According to the reusable pressure relief safety device, the critical pressure of pressure relief of the safety valve can be calibrated, and the safety of the superconducting magnet and nearby personnel and equipment can be effectively guaranteed.

Description

Technical Field

[0001] This application relates to the field of pressure relief safety valve technology, specifically to a one-way pressure relief safety valve using a superconducting magnet. Background Technology

[0002] With the development of the national economy, cryogenic superconducting technology has become more widespread, leading to the rapid development of cryogenic superconducting magnets for applications such as magnetic resonance imaging (MRI), magnetic separation, and particle accelerators. Cryogenic superconducting magnets use liquid helium as a coolant to provide the cryogenic environment required for superconductivity. In the superconducting state, because the coil resistance is zero, the magnet does not generate heat, and the liquid helium state is stable. Once the magnet loses superconductivity and generates resistance, the energy stored in the superconducting coil is rapidly converted into heat, causing the liquid helium to vaporize. This results in a rapid increase in the internal gas pressure of the cryogenic Dewar, endangering the magnet and the safety of nearby personnel and equipment. Currently, the main safety device used for pressure relief is a non-reusable rupture disc. Utility Model Content

[0003] This application provides a one-way pressure relief safety valve for superconducting magnets to solve the above-mentioned problems in the prior art.

[0004] To solve the above-mentioned technical problems, this application adopts the following technical solution:

[0005] This application provides a one-way pressure relief safety valve for a superconducting magnet, comprising: a KF25 connecting pipe, a valve body, a sleeve, a valve core, a tightening nut, a spring, and an O-ring silicone rubber seal;

[0006] The valve body has a pre-fabricated step on one side for welding the KF25 pipe, and the other side is used for connecting the sleeve.

[0007] The connecting sleeve has a pre-drilled internal thread on one side for connecting to the valve body, and a pre-drilled internal thread on the other side for adjusting the stroke of the tightening nut.

[0008] The valve core has a pre-made circular step on one side to fix the O-ring silicone rubber seal, and a pre-made countersunk hole on the other side to position the spring; multiple through holes are evenly pre-made radially along the countersunk hole for venting.

[0009] The tightening nut has a pre-drilled through external thread on its outer diameter to position the spring, a pre-drilled through hole on the other side for venting, and multiple pre-drilled evenly distributed deep grooves for adjusting the stroke of the tightening nut.

[0010] Springs are used to provide a clamping force to the O-ring silicone rubber seal by means of preload.

[0011] Based on this, the following improvements can be made to this application: the valve body 2 is made of SUS.304 stainless steel and is obtained by machining. The maximum radial outer diameter is φ=34mm, the axial length is 45mm, the surface roughness of the sealing surface is 3.2, and the surface roughness of the remaining surfaces is 6.3. A step with φ=25mm and an axial length of 10mm is prefabricated on one side for welding the KF25 pipe. The connection is sealed by TIG welding with a welding current of 70A and an argon flow rate of 12L / min. An M27×1.5 external thread with an axial length of 20mm is prefabricated on the other side for adjusting the stroke of the tightening nut.

[0012] Based on this, the application can be further improved as follows: the sleeve material is SUS.304 stainless steel, obtained by machining, with a maximum radial outer diameter φ=34mm and an axial length of 58mm. One side is pre-threaded with an M27×1.5 internal thread with an axial length of 20mm for connecting the valve body; the other side is pre-threaded with an M22×1.5 internal thread with an axial length of 33mm for adjusting the stroke of the top tightening nut.

[0013] Based on this, the application can be further improved as follows: the valve core material is H62 brass, obtained by machining, with a maximum radial outer diameter φ = 20mm and an axial length of 20mm. A circular step with a diameter of φ = 13.44mm and an axial length of 2mm is pre-made on one side, and a fillet with a radius of R = 1.32 and a surface roughness of 3.2 is then cut out to fix the O-ring silicone rubber seal. On the other side, a countersunk hole with a diameter of φ = 10mm and an axial length of 15mm is pre-made, and multiple through holes with a diameter of φ = 10mm are pre-made radially along the countersunk hole for venting. On the same side as the vent hole, a countersunk hole with a diameter of φ = 14mm and an axial length of 6mm is pre-made for positioning the spring.

[0014] Based on this, the application can be further improved as follows: the tightening nut is made of H62 brass and is obtained by machining. An M22×1.5 through external thread is pre-made along the outer diameter with an axial length of 15mm. A countersunk hole with a φ=14mm diameter and an axial length of 6mm is pre-made on one side for positioning the spring. A through hole with a φ=10mm diameter is pre-made on the other side for venting, and multiple evenly distributed grooves with a width of 3mm and a depth of 3.5mm are pre-made for adjusting the stroke of the tightening nut.

[0015] Based on this, the application can be further improved as follows: the multiple through holes are 4 through holes.

[0016] Based on this, the application can be further improved as follows: the multiple deep grooves are reduced to 4 deep grooves.

[0017] The beneficial effects provided by this application are:

[0018] The novel welded and threaded connection combination structure and spring-preloaded one-way pressure relief safety valve provided in this application are reusable pressure relief safety devices. By adjusting the tightening nut, the critical pressure of the safety valve can be calibrated, which can effectively ensure the safety of the superconducting magnet and nearby personnel and equipment.

[0019] The advantages of this application in terms of its additional aspects will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0020] Figure 1 This is a schematic axial cross-sectional view of the superconducting magnet one-way pressure relief safety valve according to an embodiment of this application.

[0021] Figure 2 The image shows a three-view drawing of a superconducting magnet one-way pressure relief safety valve according to an embodiment of this application. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this application.

[0023] The main structure of the one-way pressure relief safety valve for superconducting magnets in this application is made of SUS.304 stainless steel, while the valve core and tightening nut are made of H62 brass. It is a pre-set pressure relief safety device installed in the cryogenic Dewar liquid helium chamber of a superconducting magnet. When the superconducting magnet is in a superconducting state, the environment inside the helium chamber is under negative pressure compared to the atmospheric environment, and the spring tightens the O-ring silicone rubber seal to achieve a sealing function. When the superconducting magnet is in a non-quenching state, the environment inside the helium chamber is under positive pressure compared to the atmospheric environment. When the positive pressure exceeds a preset critical value, the spring is released, causing the internal and external parts to connect, thus achieving the pressure relief function.

[0024] like Figure 1 The image shown is an axial cross-sectional schematic diagram of a superconducting magnet one-way pressure relief safety valve according to an embodiment of this application. Figure 2 The figure shown is a three-view drawing of a superconducting magnet one-way pressure relief safety valve according to an embodiment of this application. The safety valve consists of a KF25 connector 1, a valve body 2, a sleeve 3, a valve core 4, a tightening nut 5, a spring 6, and an O-ring silicone rubber seal 7.

[0025] Among them, the KF25 connector 1, spring 6 and O-ring silicone rubber seal 7 are standard parts.

[0026] The valve body 2 mentioned above is made of SUS.304 stainless steel and is obtained by machining. Its maximum radial outer diameter is... Axial length 45mm, sealing surface surface roughness 3.2, other surface roughness 6.3, prefabricated on one side. A 10mm axial step is used for welding the KF25 pipe. TIG welding is used to seal the connection at this point. The welding current is 70A and the argon flow rate is 12L / min. On the other side, an M27×1.5 external thread with an axial length of 20mm is prefabricated for connecting the sleeve 3.

[0027] The aforementioned sleeve 3 is made of SUS.304 stainless steel and is obtained by machining. Its maximum radial outer diameter is... The axial length is 58mm. One side has a pre-drilled M27×1.5 internal thread with an axial length of 20mm for connecting the valve body 2; the other side has a pre-drilled M22×1.5 internal thread with an axial length of 33mm for adjusting the stroke of the top tightening nut 5.

[0028] The valve core 4 mentioned above is made of H62 brass and is obtained by machining. Its maximum radial outer diameter is... 20mm axial length, prefabricated on one side After a 2mm axial length circular step, a fillet with R=1.32 and a surface roughness of 3.2 is cut out to fix the O-ring silicone rubber seal 7; the other side is prefabricated A countersunk hole with an axial length of 15mm is pre-drilled, and four holes are evenly pre-drilled along the radial direction of the countersunk hole. Through holes are used for venting, and are prefabricated on the same side as the vent holes. A countersunk hole with an axial length of 6mm is used to position the spring.

[0029] The aforementioned tightening nut 5 is made of H62 brass and is obtained by machining. It has an M22×1.5 through external thread pre-drilled along its outer diameter, with an axial length of 15mm. It is pre-drilled on one side. A 6mm axial countersunk hole is used to position the spring; the other side is prefabricated. The through hole is used for venting, and four pre-drilled grooves, each 3mm wide and 3.5mm deep, are evenly distributed to adjust the travel of the top nut.

[0030] The machining steps for the valve body 2, sleeve 3, valve core 4, and tightening nut 5 obtained by machining are as follows:

[0031] Step 1: Machin the outer shape of the part using machining methods, then machine the internal through holes and countersunk holes, and finally tap and chamfer. The lathe speed is 1500 r / min and the feed rate is 100 mm / min.

[0032] Step 2: Deburr and remove flash from the parts processed in Step 1. Then perform surface degreasing treatment. First, wipe repeatedly with acetone-soaked cotton wool, then apply EAP-S001 pickling paste to the surface of the parts and leave for 2 minutes before rinsing with clean water.

[0033] The one-way pressure relief safety valve for superconducting magnets provided in this application uses a spring preload to provide the tightening force of the O-ring silicone rubber seal, achieving a sealing function when the helium chamber is under negative pressure. However, when the environment inside the helium chamber is under positive pressure compared to the atmospheric environment and the pressure exceeds a preset critical value, the pressure forces open the spring, achieving a pressure relief function. The one-way pressure relief safety valve for superconducting magnets provided in this application preferably uses a welded structure and a threaded connection structure, significantly reducing raw material and manufacturing costs, while also reducing the complexity of the processing technology. It enables continuous adjustment of the calibrated safety valve's critical pressure relief by adjusting the tightening nut, ensuring the safety of this type of cryogenic superconducting magnet without affecting the sealing effect of the helium chamber under negative pressure or the pressure relief efficiency of the helium chamber under positive pressure.

[0034] Explanation of reference numerals in the attached drawings: 1-KF25 connecting pipe, 2-valve body, 3-sleeve, 4-valve core, 5-tightening nut, 6-spring, 7-O-ring silicone rubber seal.

[0035] The solution provided in this application has the following effects:

[0036] The novel welded and threaded connection combination structure and spring-preloaded one-way pressure relief safety valve provided in this application are reusable pressure relief safety devices. By adjusting the tightening nut, the critical pressure of the safety valve can be calibrated, which can effectively ensure the safety of the superconducting magnet and nearby personnel and equipment.

[0037] Optionally, some possible implementations may include all or part of the above-described implementations.

[0038] It should be understood that in the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples" refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this description, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate different embodiments or examples described in this specification, as well as some features of different embodiments or examples.

[0039] Of course, those skilled in the art can make various corresponding changes and modifications based on this application without departing from the spirit and substance of this application, but such changes and modifications should all fall within the protection scope of the claims of this application.

Claims

1. A one-way pressure relief safety valve using a superconducting magnet, characterized in that, include: KF25 connector (1), valve body (2), sleeve (3), valve core (4), tightening nut (5), spring (6) and O-ring silicone rubber seal (7); The valve body (2) has a prefabricated step on one side for welding the KF25 pipe (1) and the other side is used for connecting the sleeve (3); The sleeve (3) has a pre-drilled internal thread on one side for connecting the valve body (2) and a pre-drilled internal thread on the other side for adjusting the stroke of the top tightening nut (5); The valve core (4) has a pre-made circular step on one side for fixing the O-ring silicone rubber seal (7) and a pre-made countersunk hole on the other side for positioning the spring; wherein, multiple through holes are pre-made evenly along the radial direction of the countersunk hole for venting. The top-tightening nut (5) has a pre-drilled through external thread on its outer diameter for positioning the spring, a pre-drilled through hole on the other side for venting, and pre-drilled multiple evenly distributed deep grooves for adjusting the stroke of the top-tightening nut. The spring (6) is used to provide a clamping force to the O-ring silicone rubber seal (7) by means of pre-tightening.

2. The superconducting magnet one-way pressure relief safety valve according to claim 1, characterized in that, The valve body 2 is made of SUS.304 stainless steel and is obtained by machining. The maximum radial outer diameter is φ=34mm, the axial length is 45mm, the surface roughness of the sealing surface is 3.2, and the surface roughness of the rest is 6.

3. A step with φ=25mm and axial length of 10mm is prefabricated on one side for welding KF25 pipe (1). TIG welding is used for sealing connection. The welding current is 70A and the argon flow rate is 12L / min. An M27×1.5 external thread with an axial length of 20mm is prefabricated on the other side for adjusting the stroke of the top tightening nut (5).

3. The superconducting magnet one-way pressure relief safety valve according to claim 1, characterized in that, The sleeve (3) is made of SUS.304 stainless steel and is obtained by machining. The maximum radial outer diameter φ = 34mm and the axial length is 58mm. One side is pre-threaded with an M27×1.5 internal thread with an axial length of 20mm for connecting the valve body (2); the other side is pre-threaded with an M22×1.5 internal thread with an axial length of 33mm for adjusting the stroke of the top nut (5).

4. The superconducting magnet one-way pressure relief safety valve according to claim 1, characterized in that, The valve core (4) is made of H62 brass and is obtained by machining. The maximum radial outer diameter is φ=20mm and the axial length is 20mm. A circular step with a diameter of φ=13.44mm and an axial length of 2mm is pre-made on one side, and a rounded corner with a radius of R=1.32 and a surface roughness of 3.2 is cut out to fix the O-ring silicone rubber seal (7). On the other side, a countersunk hole with a diameter of φ=10mm and an axial length of 15mm is pre-made, and multiple through holes with a diameter of φ=10mm are pre-made evenly along the radial direction of the countersunk hole for venting. On the same side of the vent hole, a countersunk hole with a diameter of φ=14mm and an axial length of 6mm is pre-made for positioning the spring.

5. The superconducting magnet one-way pressure relief safety valve according to claim 1, characterized in that, The tightening nut (5) is made of H62 brass and is obtained by machining. It has an M22×1.5 through external thread pre-made along the outer diameter with an axial length of 15mm. On one side, it has a countersunk hole with a diameter of φ=14mm and an axial length of 6mm for positioning the spring. On the other side, it has a through hole with a diameter of φ=10mm for venting and multiple evenly distributed grooves with a width of 3mm and a depth of 3.5mm for adjusting the stroke of the tightening nut.

6. The superconducting magnet one-way pressure relief safety valve according to claim 1, characterized in that, Multiple through holes are 4 through holes.

7. The superconducting magnet one-way pressure relief safety valve according to claim 1, characterized in that, There are four deep grooves.

Images