A position detection device for a hydrogen compressor

Abstract

This patent application discloses a position detection device for a hydrogen compressor, relating to the field of hydrogen compression equipment technology. It includes a magnetostrictive displacement sensor disposed at one end of the hydrogen compressor, and a compound piston slidingly disposed within the compression chamber of the compressor. The piston comprises a piston body, on which a magnetic ring is fitted to cooperate with the magnetostrictive displacement sensor. A detection blind hole is opened at the end facing the detection probe, allowing the sensor's detection probe to extend into the detection blind hole within the compression chamber of the piston body. Through the cooperation of the magnetic ring and the sensor, combined with the design of the detection probe extending into the blind hole, the position of the compound piston within the compression chamber can be accurately detected, improving detection stability and reliability, and adapting to the working environment of the hydrogen compressor.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen compressor detection technology, and in particular to a position detection device for a hydrogen compressor. Background Technology

[0002] With the rapid development of the hydrogen energy industry, the operational stability and safety of hydrogen compressors, as core equipment in hydrogen storage and transportation systems, have become a major concern. The piston, a key moving component of the hydrogen compressor, directly affects the compressor's efficiency and operational safety due to its position detection accuracy. Inaccurate piston position detection can lead to imbalances in compressor gas flow regulation, abnormal cylinder compression ratios, and even safety accidents such as mechanical collisions.

[0003] Currently, hydrogen compressor piston position detection mostly uses photoelectric sensors and Hall effect sensors. However, photoelectric sensors are susceptible to interference from oil and water vapor in the compression chamber, leading to a decrease in detection accuracy, especially in high-pressure hydrogen environments where the detection signal is prone to drift. Hall effect sensors lack stability under conditions of high-frequency vibration and strong electromagnetic interference, making them prone to misjudgment and seriously affecting the closed-loop control accuracy of the compressor.

[0004] Meanwhile, the existing detection device has a fixed installation structure, making adjustments inconvenient and difficult to adapt to the adjustment requirements of different compressor models or operating parameters, thus increasing equipment maintenance costs. Furthermore, the design of the piston-detection device's mating structure has flaws: the blind detection orifice lacks optimized design, leading to stress concentration at the orifice opening; the orifice wall has poor wear resistance, and long-term use can cause wear and deformation, resulting in a larger gap between the detection probe and the blind orifice, affecting detection accuracy; the magnetic ring is mostly made of a single material, not securely fixed to the piston body, and lacks effective protective measures, making it prone to detachment and demagnetization under high-pressure hydrogen erosion and mechanical vibration, further shortening the lifespan of the detection device and failing to meet the requirements for long-term stable operation of the hydrogen compressor. Utility Model Content

[0005] To address the aforementioned issues, this invention proposes a position detection device for a hydrogen compressor. By combining a magnetic ring with a sensor and a design that allows the detection probe to extend into a blind hole, the device can accurately detect the position of the composite piston within the compression chamber, thereby improving detection stability and reliability and adapting to the working environment of a hydrogen compressor.

[0006] This utility model is achieved through the following technical solution: a position detection device for a hydrogen compressor, comprising a magnetostrictive displacement sensor disposed at one end of the hydrogen compressor, a compression chamber disposed inside the hydrogen compressor, a compound piston slidably disposed inside the compression chamber, the compound piston comprising a piston body, a magnetic ring fitted on the piston body in cooperation with the magnetostrictive displacement sensor, a detection blind hole opened at the end of the piston body facing the detection probe, and the detection probe of the detector being able to extend into the detection blind hole of the piston body inside the compression chamber of the hydrogen compressor.

[0007] To further optimize this utility model, the following technical solutions may be preferred: Preferably, the blind hole has a 30° chamfer at the opening, a hemispherical structure at the bottom, and a 0.01-0.03mm thick nickel-phosphorus alloy layer plated on the inner wall of the blind hole.

[0008] Preferably, the magnetic ring includes an inner stainless steel ring and an outer neodymium iron boron magnet. The inner stainless steel ring is interference-fitted with the piston body, and the outer neodymium iron boron magnet is bonded to the inner stainless steel ring with epoxy resin. The magnet is wrapped with a 0.1 mm thick polytetrafluoroethylene protective layer.

[0009] Preferably, the piston body has a sealing groove and a guide ring mounting groove on the outer periphery of the end near the detection blind hole. A guide ring made of polyimide is installed in the guide ring mounting groove, and the outer diameter of the guide ring is clearance-fitted with the inner wall of the compression chamber.

[0010] Preferably, the depth of the detection blind hole is not less than the piston body stroke, and the coaxiality error between the blind hole axis and the central axis of the piston body does not exceed 0.02mm.

[0011] Preferably, the piston body is made of forged aluminum alloy, which is suitable for large-diameter pistons. A copper alloy wear-resistant sleeve is embedded in the blind hole, and the inner roughness Ra of the wear-resistant sleeve is ≤0.8μm.

[0012] This utility model has the following beneficial effects: (1) Significantly improved detection accuracy and stability: The detection method using a magnetostrictive displacement sensor in conjunction with a magnetic ring is more resistant to oil, water vapor and electromagnetic interference than traditional photoelectric and Hall sensors. It is especially suitable for high-pressure hydrogen environments and effectively avoids signal drift and misjudgment. The precise matching of the detection blind hole and the probe, combined with the high coaxiality control of the blind hole axis and the piston center axis (error ≤ 0.02mm), further ensures the accuracy of position detection.

[0013] (2) Enhanced structural reliability and durability: The 30° chamfer design of the blind hole reduces stress concentration, the hemispherical structure at the bottom of the hole reduces the impact of probe contact, and the nickel-phosphorus alloy plating (0.01-0.03mm) on the inner wall and the copper alloy wear-resistant sleeve (Ra≤0.8μm) significantly improve wear resistance and extend the service life of the blind hole; the magnetic ring adopts a composite structure with an inner stainless steel ring interference fit and an outer neodymium iron boron magnet bonded together, combined with a polytetrafluoroethylene protective layer, which solves the problems of traditional magnetic rings being not firmly fixed and easily demagnetized, and is suitable for high pressure scouring and vibration conditions.

[0014] (3) Installation and compatibility optimization: The waist-shaped hole design of the L-shaped mounting plate allows the sensor position to be flexibly adjusted to adapt to different models of compressors and changes in operating parameters, reducing installation and maintenance costs; the polyimide guide ring guides the piston movement, reduces radial offset, and ensures long-term stable cooperation of the detection components.

[0015] (4) Overall performance improvement: By selecting materials (forged aluminum alloy piston body, wear-resistant sleeve, etc.) and optimizing the structure, while meeting the requirements of lightweighting, the fatigue resistance and service life of the device are greatly improved, providing reliable position detection guarantee for the efficient and safe operation of the hydrogen compressor. Attached Figure Description

[0016] Figure 1 Schematic diagram of the overall structure of the position detection device Figure 1 ; Figure 2 This is a schematic diagram of the magnetic ring structure; Wherein: 1-Hydrogen compressor; 2-Compression chamber; 3-Composite piston; 4-Magnetic ring; 5-Inner stainless steel ring; 6-Outer neodymium iron boron magnet; 7-Polytetrafluoroethylene protective layer; 8-Epoxy resin adhesive; 9-Detection blind hole; 10-Detection probe; 11-Seal mounting groove; 12-Guide ring mounting groove; 13-Magnetostrictive displacement sensor. Detailed Implementation

[0017] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0018] The technical solutions of the present utility model 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 utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0019] Example 1 like Figure 1 , 2 As shown: The position detection device for the hydrogen compressor in this embodiment includes components such as a magnetostrictive displacement sensor, a composite piston, and an L-shaped mounting plate; The magnetostrictive displacement sensor 13 is fixed to the end of the hydrogen compressor 1. The hydrogen compressor 1 is provided with a compression chamber 2, and a compound piston 3 is slidably arranged in the compression chamber 2. The compound piston includes a piston body, which is made of forged aluminum alloy. While meeting the requirements of lightweighting, it can greatly improve the fatigue resistance and working life of the device.

[0020] A magnetic ring 4, which works with a magnetostrictive displacement sensor, is fitted onto the piston body. The magnetic ring includes an inner stainless steel ring 5 and an outer neodymium iron boron magnet 6. The inner stainless steel ring is interference-fitted with the piston body to ensure the stability of the magnetic ring on the piston body. The outer neodymium iron boron magnet is bonded to the inner stainless steel ring with epoxy resin adhesive 8, and the magnet is wrapped with a 0.1mm thick polytetrafluoroethylene protective layer 7, which solves the problems of traditional magnetic rings being not firmly fixed and easily demagnetized, and is suitable for high-pressure erosion and vibration conditions.

[0021] A detection blind hole 9 is provided at the end of the piston body facing the detection probe. The detection probe 10 of the detector can extend into the detection blind hole of the piston body inside the compression chamber of the hydrogen compressor. The depth of the detection blind hole is not less than the piston body stroke, and the coaxiality error between the blind hole axis and the central axis of the piston body does not exceed 0.02mm to ensure the accuracy of position detection. A 30° chamfer is provided at the opening of the detection blind hole to reduce stress concentration; the bottom of the hole is designed with a hemispherical structure to reduce the impact of probe contact; the inner wall of the blind hole is plated with a 0.01-0.03mm thick nickel-phosphorus alloy layer, and a copper alloy wear-resistant sleeve is embedded in the blind hole. The inner roughness Ra of the wear-resistant sleeve is ≤0.8μm, which significantly improves wear resistance and extends the service life of the blind hole.

[0022] The piston body has a seal mounting groove 11 and a guide ring mounting groove 12 on its outer periphery near the detection blind hole. The seal mounting groove 11 is used to install the seal, and the guide ring mounting groove 12 is fitted with a polyimide guide ring. The outer diameter of the guide ring is clearance-fitted with the inner wall of the compression chamber to guide the piston movement, reduce radial offset, and ensure long-term stable fit of the detection components.

[0023] The position detection device for the hydrogen compressor in this embodiment, through the above-mentioned structural design and component selection, adopts a detection method using a magnetostrictive displacement sensor in conjunction with a magnetic ring. Compared with traditional photoelectric and Hall sensors, it has stronger resistance to oil, water vapor and electromagnetic interference, and is especially suitable for high-pressure hydrogen environments. It effectively avoids signal drift and misjudgment, and provides reliable position detection guarantee for the efficient and safe operation of the hydrogen compressor.

[0024] 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.

[0025] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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 position detection device for a hydrogen compressor, characterized in that: The device includes a magnetostrictive displacement sensor disposed at one end of a hydrogen compressor. The hydrogen compressor has a compression chamber, and a compound piston is slidably disposed within the compression chamber. The compound piston includes a piston body, on which a magnetic ring cooperating with the magnetostrictive displacement sensor is fitted. A detection blind hole is opened at the end of the piston body facing the detection probe, and the detection probe of the magnetostrictive displacement sensor can extend into the detection blind hole of the piston body within the compression chamber of the hydrogen compressor.

2. The position detection device for a hydrogen compressor according to claim 1, characterized in that: The blind hole has a 30° chamfer at the opening, a hemispherical structure at the bottom, and a 0.01-0.03mm thick nickel-phosphorus alloy layer on its inner wall.

3. The position detection device for a hydrogen compressor according to claim 1, characterized in that: The magnetic ring includes an inner stainless steel ring and an outer neodymium iron boron magnet. The inner stainless steel ring is interference-fitted with the piston body, and the outer neodymium iron boron magnet is bonded to the inner stainless steel ring with epoxy resin. The magnet is wrapped with a 0.1 mm thick polytetrafluoroethylene protective layer.

4. The position detection device for a hydrogen compressor according to claim 1, characterized in that: The piston body has a sealing groove and a guide ring mounting groove on its outer periphery near the detection blind hole. A polyimide guide ring is installed in the guide ring mounting groove, and the outer diameter of the guide ring is clearance-fitted with the inner wall of the compression chamber.

5. The position detection device for a hydrogen compressor according to claim 1, characterized in that: The depth of the detection blind hole is not less than the piston body stroke, and the coaxiality error between the blind hole axis and the central axis of the piston body does not exceed 0.02mm.

6. The position detection device for a hydrogen compressor according to claim 1, characterized in that: The piston body is made of forged aluminum alloy, and a copper alloy wear-resistant sleeve is embedded in the blind hole. The inner roughness of the wear-resistant sleeve is Ra≤0.8μm.

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