A rotor structure for a hydrogen circulation pump and the hydrogen circulation pump thereof

Abstract

This utility model relates to a rotor structure for a hydrogen circulation pump and the hydrogen circulation pump thereof. The rotor structure includes a rotor body with a groove. An inner protective ring is installed on the inner ring wall of the groove, and an outer protective ring is installed on the outer ring wall of the groove. Protective ring plates are welded to the upper ends of the inner and outer protective rings. The protective ring plates, the outer protective ring, the inner protective ring, and the bottom wall of the groove cooperate to form a sealed cavity. A magnetic yoke and a magnet are bonded together with adhesive within the sealed cavity, with the magnet located above the magnetic yoke. By utilizing the inner and outer protective rings, the protective ring plates, and the bottom wall of the groove to form a sealed cavity, and installing the magnet and the magnetic yoke within the sealed cavity, contact between hydrogen and the magnet is fundamentally prevented, solving the problem of hydrogen corrosion of the magnet and greatly extending the service life of the magnet.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen circulation pump technology, specifically to a rotor structure for a hydrogen circulation pump and the hydrogen circulation pump thereof. Background Technology

[0002] The hydrogen recirculation pump is a key component of a fuel cell system, and its core power source is a high-speed permanent magnet synchronous motor. The motor rotor typically uses high-performance permanent magnet materials. However, the operating environment of a fuel cell is filled with high-purity hydrogen gas at certain pressures and temperatures. After prolonged contact with hydrogen gas, the magnets undergo hydrogen embrittlement and hydrogen corrosion reactions, leading to magnet pulverization, magnetic attenuation, and ultimately motor failure. This severely impacts the reliability and lifespan of the hydrogen recirculation pump and even the entire fuel cell system.

[0003] Currently, the main protective measures employed include: 1. Surface coating protection: electroplating nickel or zinc onto the magnet surface, or spraying epoxy resin, etc. However, these coatings have microscopic pores, and their protective effect will gradually fail under long-term high-pressure hydrogen permeation. Furthermore, the coating may crack under high-speed centrifugal force, accelerating the failure of the protection. 2. Using hydrogen barrier coatings: such as physical vapor deposition (PVD) or chemical vapor deposition (CVD) to prepare dense ceramic coatings. However, this method is complex, costly, and the adhesion between the coating and the magnet substrate may weaken under thermal cycling and mechanical stress.

[0004] Therefore, there is an urgent need for a more reliable, durable and cost-effective solution to completely isolate hydrogen from contact with the magnet. Utility Model Content

[0005] This utility model addresses the existing technical problems by providing a rotor structure for a hydrogen circulation pump and a hydrogen circulation pump thereof.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A rotor structure for a hydrogen circulation pump includes a rotor body, a groove on the rotor body, an inner protective ring installed on the inner ring wall of the groove, an outer protective ring installed on the outer ring wall of the groove, a protective ring plate welded to the upper end of the inner and outer protective rings, the protective ring plate, the outer protective ring, the inner protective ring and the bottom wall of the groove forming a sealed cavity, a magnetic yoke and a magnet bonded in the sealed cavity by an adhesive, the magnet being located above the magnetic yoke.

[0007] Based on the above technical solution, the present invention can be further improved as follows: Preferably, the outer protective ring, the protective ring plate, and the inner protective ring are made of pure titanium.

[0008] Preferably, the outer protective ring, the protective ring plate, and the inner protective ring are of model TA1 or TA2.

[0009] Preferably, the thickness of the outer protective ring, the protective ring plate, and the inner protective ring is 0.4mm-0.6mm.

[0010] Preferably, the magnet is made of samarium cobalt.

[0011] Preferably, the grade of the magnet is SC36H.

[0012] Preferably, the colloid is a one-component epoxy adhesive.

[0013] Preferably, the rotor body is made of aluminum alloy.

[0014] Preferably, the protective ring plate is welded to the inner protective ring and the outer protective ring by laser welding.

[0015] This utility model also discloses a hydrogen circulation pump, including the rotor structure described above.

[0016] The beneficial effects of this utility model are: 1. Complete isolation of hydrogen: The inner protective ring, outer protective ring, protective ring plate and bottom wall of the tank are used to form a sealed cavity, and the magnet and magnetic yoke are installed in the sealed cavity. This fundamentally eliminates the contact between hydrogen and the magnet, solves the problem of hydrogen corrosion of the magnet, and greatly extends the service life of the magnet.

[0017] 2. Stable and reliable structure: The inner protective ring, outer protective ring, and protective ring plate are all made of pure titanium. Pure titanium has excellent strength, toughness, and corrosion resistance, and can withstand the centrifugal force and vibration generated by the high-speed rotation of the rotor. Furthermore, the laser welding produces high-strength welds with a small heat-affected zone, ensuring the long-term stability of the encapsulation structure.

[0018] 3. Simple process and controllable cost: Compared with the complex PVD / CVD coating process, the sealing cavity and laser welding process of this utility model are more mature, easier to automate production, and have a lower overall cost. Attached Figure Description

[0019] Figure 1 This is an exploded view of the rotor structure of this utility model; Figure 2 This is a cross-sectional schematic diagram of the rotor structure of this utility model.

[0020] The attached diagram is labeled as follows: 1. Rotor body; 2. Magnet; 3. Magnetic yoke; 4. Inner protective ring; 5. Outer protective ring; 6. Protective ring plate. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0022] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. The terms "vertical," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0023] like Figure 1 and Figure 2 As shown, this utility model discloses a rotor structure for a hydrogen circulation pump, including a rotor body 1. A groove is provided on the rotor body 1. An inner protective ring 4 is bonded to the inner ring wall of the groove, and an outer protective ring 5 is bonded to the outer ring wall of the groove. A protective ring plate 6 is welded to the upper end of the inner protective ring 4 and the outer protective ring 5. The protective ring plate 6, together with the outer protective ring 5, the inner protective ring 4, and the bottom wall of the groove, forms a sealed cavity, ensuring the integrity and airtightness of the sealed cavity and preventing hydrogen from penetrating into the interior of the sealed cavity. A magnetic yoke 3 and a magnet 2 are bonded together in the sealed cavity using adhesive. The material of the magnetic yoke 3 is electrical pure iron, grade DT4. The magnet 2 is located above the magnetic yoke 3. This arrangement is beneficial for optimizing the distribution and performance of the magnetic field. The sealed cavity constructed by the inner protective ring 4, outer protective ring 5, protective ring plate 6 and bottom wall of the tank can effectively isolate hydrogen from the external environment, prevent hydrogen from penetrating to the surface of the magnet 2 and causing hydrogen embrittlement or hydrogen corrosion, thereby ensuring the physical integrity and magnetic stability of the magnet 2 and guaranteeing its service life.

[0024] In this embodiment, the outer protective ring 5, the protective ring plate 6, and the inner protective ring 4 are made of pure titanium, specifically model TA1 or TA2. Pure titanium possesses excellent corrosion resistance and high strength, enabling it to maintain long-term stability in the harsh working environment of the hydrogen circulation pump. It effectively resists hydrogen erosion and the centrifugal force generated during high-speed rotor rotation, ensuring the structural integrity of the sealed cavity. The pure titanium material, model TA1 or TA2, not only guarantees corrosion resistance but also exhibits good machinability, facilitating the manufacture of shapes and dimensional accuracy that meet design requirements, thereby improving production efficiency and product quality.

[0025] Furthermore, the outer protective ring 5, the protective ring plate 6, and the inner protective ring 4 have a thickness of 0.4mm-0.6mm. While ensuring the structural strength and corrosion resistance of the sealed cavity, this minimizes the overall weight of the rotor body 1, reducing energy consumption and vibration during high-speed rotation and improving the operating efficiency and stability of the hydrogen circulation pump. Simultaneously, this thickness range also considers material cost and processing difficulty, resulting in a rotor structure that meets performance requirements while offering high cost-effectiveness.

[0026] In this embodiment, the magnet 2 is made of samarium cobalt, and its grade is SC36H. Samarium cobalt magnets possess excellent magnetic properties such as high remanence, high coercivity, and high energy product, enabling them to maintain stable magnetic output in the working environment of the hydrogen circulation pump, providing strong and stable power support for the motor. Furthermore, samarium cobalt magnets also exhibit good corrosion resistance and high-temperature stability (suitable for 300℃-350℃), allowing them to adapt to various harsh operating conditions that the hydrogen circulation pump may encounter.

[0027] Furthermore, the adhesive is a one-component epoxy adhesive. The yoke 3 and the magnet 2 are fixed in the sealed cavity by the one-component epoxy adhesive. This adhesive has the advantages of fast curing speed, high bonding strength and good chemical corrosion resistance. It can quickly and firmly bond the yoke 3 and the magnet 2 in the sealed cavity, ensuring that the yoke 3 and the magnet 2 will not loosen or shift during the high-speed rotation of the rotor body 1, thus ensuring the stability and reliability of the motor magnetic field.

[0028] In this embodiment, the rotor body 1 is made of aluminum alloy. Aluminum alloy has advantages such as low density, high strength and good corrosion resistance. Using aluminum alloy to make the rotor body 1 can effectively reduce the weight of the rotor body 1, reduce motor energy consumption and improve the overall performance of the hydrogen circulation pump while ensuring the structural strength and rigidity of the rotor body 1.

[0029] In this embodiment, the protective ring plate 6 is welded to the inner protective ring 4 and the outer protective ring 5 by laser welding. Laser welding has advantages such as fast welding speed, high weld quality, and small heat-affected zone, which can ensure that a strong and airtight weld is formed between the protective ring plate 6 and the inner protective ring 4 and the outer protective ring 5, preventing hydrogen gas from penetrating into the sealed cavity from the welded part, and further improving the sealing performance and reliability of the rotor structure.

[0030] The manufacturing process of this rotor structure is as follows: First, an aluminum alloy rotor body 1 is manufactured, and a groove is milled inside to accommodate the magnet 2 and the yoke 3.

[0031] During assembly, first apply single-component epoxy adhesive to the inner protective ring 4 and the outer protective ring 5 and place them into the tank respectively. Then, apply single-component epoxy adhesive to the contact surfaces of the magnet 2 and the yoke 3 to form an assembly. Place the assembly into the tank and attach it tightly to the inner protective ring 4 and the outer protective ring 5.

[0032] Finally, the protective ring plate 6 is placed over the opening of the tank as a seal. A laser welding machine is used to weld the protective ring plate 6 together with the inner protective ring 4 and the outer protective ring 5, forming a continuous, uniform, and airtight laser weld at the weld joint. The laser power is 80-150W, the welding speed is 20-50mm / s, the pulse frequency is 100-500Hz, the pulse width is 0.5-2.0ms, the shielding gas is high-purity argon (99.999%), and the gas flow rate is 15-25L / min.

[0033] The rotor structure is then heated to 150°C for curing and held at that temperature for 30 minutes. At this point, the magnet 2 and yoke 3 are completely sealed within the sealed cavity, thoroughly isolated from the external hydrogen environment. This solves the problem of hydrogen corrosion of the magnet 2, ensuring its service life, and also offers advantages such as stable and reliable structure, simple process, and low cost.

[0034] This utility model also discloses a hydrogen circulation pump, which includes the above-mentioned rotor structure. Due to the adoption of this rotor structure with excellent protection performance, the hydrogen circulation pump can operate more stably and reliably in the fuel cell system, thereby improving the service life of the hydrogen circulation pump.

[0035] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A rotor structure for a hydrogen circulation pump, comprising a rotor body (1) provided with a groove, characterized in that, The inner ring wall of the tank is equipped with an inner protective ring (4), and the outer ring wall of the tank is equipped with an outer protective ring (5). The upper ends of the inner protective ring (4) and the outer protective ring (5) are welded with protective ring plates (6). The protective ring plates (6), the outer protective ring (5), the inner protective ring (4) and the bottom wall of the tank form a sealed cavity. The sealed cavity is bonded with a magnetic yoke (3) and a magnet (2) by adhesive. The magnet (2) is located above the magnetic yoke (3).

2. The rotor structure for a hydrogen circulation pump according to claim 1, characterized in that, The outer protective ring (5), the protective ring plate (6), and the inner protective ring (4) are made of pure titanium.

3. The rotor structure for a hydrogen circulation pump according to claim 2, characterized in that, The outer protective ring (5), the protective ring plate (6), and the inner protective ring (4) are of model TA1 or TA2.

4. The rotor structure for a hydrogen circulation pump according to claim 1, characterized in that, The thickness of the outer protective ring (5), the protective ring plate (6), and the inner protective ring (4) is 0.4mm-0.6mm.

5. The rotor structure for a hydrogen circulation pump according to claim 1 or 4, characterized in that, The magnet (2) is made of samarium cobalt.

6. The rotor structure for a hydrogen circulation pump according to claim 5, characterized in that, The grade of the magnet (2) is SC36H.

7. The rotor structure for a hydrogen circulation pump according to claim 1, characterized in that, The colloid is a one-component epoxy adhesive.

8. The rotor structure for a hydrogen circulation pump according to claim 1, characterized in that, The rotor body (1) is made of aluminum alloy.

9. The rotor structure for a hydrogen circulation pump according to claim 1, characterized in that, The protective ring plate (6) is welded together with the inner protective ring (4) and the outer protective ring (5) by laser welding.

10. A hydrogen circulation pump, characterized in that, Includes the rotor structure as described in any one of claims 1 to 9.

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