Rotation detection device and air compressor dryer

Abstract

The utility model belongs to the technical field of air drying equipment, and particularly relates to a rotation detection device and an air compressor dryer. The rotation detection device is suitable for detecting the rotating shaft, particularly suitable for the rotating shaft rotating slowly, and whether the rotating shaft rotates normally or not can be judged through the periodic change of the magnetic field detected by the magnetic sensor. The protective cover is used for fixing the magnetic inductor and has the advantages that equipment where the rotating shaft is located is slightly changed, the working performance of the rotating shaft cannot be affected, independence with other parts is high, and the design difficulty is small; (2) the distance between the magnetic inductor and the magnetic piece is conveniently controlled, so that the magnetic inductor is close to the magnetic piece as much as possible, and compared with other modes, the magnetic inductor is arranged on the protective cover, so that the magnetic inductor is more convenient to be close to the rotating shaft; and (3) the protective cover is made of a magnetic shielding material, so that an external magnetic field is prevented from interfering with normal work of the device.

Description

Technical Field

[0001] The utility model belongs to the technical field of air drying equipment, and particularly relates to a rotation detection device and an air compressor dryer. Background Art

[0002] Rotating equipment is widely used in modern industry. Most rotating equipment is connected to a prime mover through transmission devices such as speed reducers, belts, and hinges. The failure of the prime mover can be quickly feedback, but it is currently difficult to monitor the situation where the rotating equipment stops running due to a failure of the transmission device. Among rotating equipment such as air compressor dryers, there is a rotating shaft with a rotational speed usually only 5 - 8 revolutions per hour.

[0003] In practical applications, the stop of the rotation of the rotating equipment of the air compressor dryer will cause a large water content in the compressed air, which will have a great impact on the downstream air - using devices and trigger a series of safety and quality problems.

[0004] Chinese Patent CN202010146506.9 discloses a rotating body position detection device. Through a magnetic ring, at least two Hall sensors and a calculation unit, the position of the rotating body is calculated according to the magnetic field intensity detected by each Hall sensor, which is a device applicable to detecting the positions of the stator and rotor of a motor. However, when it is used to detect a rotating shaft with a relatively slow rotational speed, there may be a problem that the sensitivity is not high due to too small a change in the Hall voltage within a short period of time. In addition, in the specific solution provided, the Hall sensors, magnetic rings, and rotating shafts are all inside the machine shell, which will lead to the need for co - design with other structures for fixing and avoiding interference, etc., and the complexity is relatively high.

[0005] Therefore, providing a rotation detection device and an air compressor dryer with such a transmission detection device is an urgent technical problem in the field. Summary of the Utility Model

[0006] In view of the existing situation, the utility model provides a rotation detection device and an air compressor dryer with such a transmission detection device, which is used to judge whether a rotating shaft with a relatively slow rotational speed rotates normally, and solves at least one of the above - mentioned technical problems.

[0007] The technical solution provided by this application is a rotation detection device for detecting the rotation of a rotating shaft, including: a magnetic part arranged on the rotating shaft and rotating with the rotating shaft; a protective cover covering the outside of the end of the rotating shaft, and the protective cover is hermetically connected to the equipment where the rotating shaft is located; a magnetic sensor arranged inside the protective cover and detecting the rotation of the magnetic part through the Hall effect.

[0008] Further, the protective cover is provided with a threaded hole, and the magnetic sensor is screwed to the protective cover.

[0009] Further, the protective cover is screwed to the equipment where the rotating shaft is located.

[0010] Furthermore, a circlip is provided on the rotating shaft, and the magnetic member is mounted on the rotating shaft through the circlip.

[0011] Furthermore, the magnetic member includes at least 6 pairs of magnetic poles.

[0012] Furthermore, the magnetic member is a magnetic ring, and the magnetic ring is sleeved on the rotating shaft.

[0013] Furthermore, the magnetic ring is magnetized at an oblique angle.

[0014] Furthermore, the number of magnetic sensors is greater than or equal to 2.

[0015] Furthermore, the magnetic sensor is electrically connected to the monitoring device.

[0016] Another technical solution provided by the present application is an air compressor dryer, including the above-mentioned dynamic detection device.

[0017] The beneficial effects of the present application are as follows:

[0018] 1. A rotation detection device applicable to detecting a rotating shaft, especially a rotating shaft with a slow rotation speed, is provided. The normal rotation of the rotating shaft can be judged by detecting the periodic change of the magnetic field through a magnetic sensor.

[0019] 2. A protective cover is provided in the present application. In addition to preventing foreign objects from entering the working area of the rotating shaft, it is also used to fix the magnetic sensor. The advantages of using the protective cover to set the magnetic sensor are as follows: (1) The modification of the equipment where the rotating shaft is located is small. It only needs to fix the protective cover to the equipment where the rotating shaft is located. In the equipment that already has a protective cover, it is even unnecessary to modify the original machine, but only need to add a magnetic sensor to the original protective cover, which will not affect the working performance of the rotating shaft and has strong independence from other components and small design difficulty; (2) It is convenient to control the distance between the magnetic sensor and the magnetic member. For a rotating shaft with a slow rotation speed, the Hall voltage change between the magnetic member and the magnetic sensor is small in a short time, making it difficult to judge the stop situation in time. In order to improve the sensitivity of the magnetic sensor as much as possible, the magnetic sensor should be as close as possible to the magnetic member. Setting the magnetic sensor on the protective cover is more convenient to set it close to the rotating shaft compared to other methods such as fixing it on the shell of the machine where the rotating shaft is located; (3) It is convenient to avoid external magnetic field interference with the normal operation of the present application by setting the protective cover as a magnetic shielding material. Description of the Drawings

[0020] The drawings incorporated in and constituting a part of the specification illustrate embodiments of the present utility model and, together with the description, are used to explain the principles of the present utility model. In these drawings, like reference numerals are used to denote like elements. The drawings in the following description are some embodiments of the present utility model, not all embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 A radial schematic diagram of an embodiment of the present utility model;

[0022] Figure 2 An axial schematic diagram of an embodiment of the present utility model;

[0023] Reference numerals:

[0024] Rotating shaft 100; monitoring device 200; magnetic member 1; protective cover 2; magnetic inductor 3; snap ring 4. Detailed implementation manners

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0026] In the description of the present application, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal connection or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In this application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may also include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0028] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "left", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operations, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to this application. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0029] As Figure 1-2 , Embodiment 1 provides a rotation detection device for detecting the rotation of a rotating shaft 100, including: a magnetic member 1 disposed on the rotating shaft 100 and rotating with the rotating shaft 100; a protective cover 2 covering the outside of the end of the rotating shaft 100, and the protective cover 2 is sealingly connected to the device where the rotating shaft 100 is located; a magnetic inductor 3 disposed inside the protective cover 2 for detecting the rotation of the magnetic member 1 through the Hall effect.

[0030] This application is a rotation detection device applicable to detecting the rotating shaft 100, especially applicable to the rotating shaft 100 with a relatively slow rotation speed. It can judge whether the rotating shaft 100 rotates normally by detecting whether the magnetic field changes periodically through the magnetic inductor 3. Compared with a general rotating shaft 100, in the rotating shaft 100 with a relatively slow rotation speed, the Hall voltage detected by a general Hall sensor changes little in a short time, resulting in difficulty in timely judging the situation of stopping rotation.

[0031] As Figure 1, in this application, a protective cover 2 is provided. Besides being used to prevent foreign objects from entering the working area of the rotating shaft 100, it is also used to fix the magnetic inductor 3. The effect of using the protective cover 2 to set the magnetic inductor 3 is as follows: First, the modification to the equipment where the rotating shaft 100 is located is small. Only need to fix the protective cover 2 to the equipment where the rotating shaft 100 is located. In the equipment that already has a protective cover, there is even no need to modify the original machine, but only need to add a magnetic inductor 3 on the original protective cover, which will not affect the working performance of the rotating shaft 100 and has a small design difficulty; Second, it is convenient to control the distance between the magnetic inductor 3 and the magnetic part 1. To improve the sensitivity of the magnetic inductor 3 as much as possible, the magnetic inductor 3 should be as close as possible to the magnetic part 1. Setting the magnetic inductor 3 on the protective cover 2 is more convenient to set it to be close to the rotating shaft 100 compared to other methods such as fixing it on the outer shell of the machine where the rotating shaft 100 is located, etc.; Third, it is convenient to avoid external magnetic field interference with the normal operation of this application by setting the protective cover 2 as a magnetic shielding material.

[0032] In this embodiment, the protective cover 2 is provided with threaded holes, and the magnetic inductor 3 is screwed to the protective cover 2. Connecting the protective cover 2 and the magnetic inductor 3 by screwing only requires opening threaded holes on the protective cover 2, with less modification to the protective cover 2, being easy to implement and saving costs. In addition, screwing is a detachable connection, which is convenient for adjusting the relative distance between the magnetic inductor 3 and the magnetic part 1.

[0033] In this embodiment, the protective cover 2 is screwed to the equipment where the rotating shaft 100 is located. Screwing can make the protective cover 2 and the equipment where the rotating shaft 100 is located have better sealing performance, which is convenient for better preventing foreign objects from entering the working area of the rotating shaft 100 and forming magnetic shielding. In addition, screwing is a detachable connection, which is convenient for disassembling and assembling the protective cover 2 to perform work such as installing and maintaining the magnetic part 1 and the rotating shaft 100.

[0034] In the working scenario where the rotating speed of the rotating shaft 100 is relatively slow, such as in an air compressor dryer, it is necessary to set as many magnetic poles as possible to reduce the area where the magnetic field intensity change is insufficient, avoid the magnetic inductor 3 being in the condition of too small Hall voltage change for a long time, and increase the sensitivity. Empirically, the magnetic part 1 includes at least 6 pairs of radial magnetic poles. In this embodiment, the magnetic part 1 includes 6 pairs of radial magnetic poles and can be used for a rotating shaft with a speed of 5 - 8 revolutions per minute.

[0035] In this embodiment, the magnetic part 1 is a multi-pole magnetic ring sleeved on the rotating shaft 100. The magnetic ring is adapted to the shape of the rotating shaft 100, being easy to implement and having low cost.

[0036] In this embodiment, the magnetic ring is magnetized at an oblique angle. The magnetic field generated by the magnetized magnetic ring at an oblique angle has uniform changes in multiple directions, which helps to reduce the area where the magnetic field intensity change is too small, reduce the requirements for the installation position of the magnetic inductor 3, and improve the sensitivity of the magnetic inductor 3.

[0037] As Figure 1 , in this embodiment, a circlip 4 is provided on the rotating shaft 100, and the magnetic member 1 is mounted on the rotating shaft 100 through the circlip 4. In a working scenario with a relatively low rotational speed, fixing the magnetic member 1 to the rotating shaft 100 through the circlip 4 can meet the fixing requirements, and the circlip 4 does not cause structural changes to the rotating shaft 100 and does not affect the service life of the rotating shaft 100. In addition, the circlip 4 is also easy to disassemble and assemble, facilitating the adjustment of the relative position of the magnetic member 1 to adapt the position of the magnetic member 1 to the magnetic inductor 3.

[0038] As Figure 2 , in this embodiment, the number of magnetic inductors 3 is 2. Setting the number of magnetic inductors 3 to be greater than or equal to 2 can provide redundant backup to avoid false alarms caused by failures of the magnetic inductor 3.

[0039] Furthermore, if multiple magnetic poles of the magnetic member 1 are evenly distributed in the circumferential direction around the rotating shaft 100, the magnetic field will have rotational symmetry in the circumferential direction. When the rotating shaft 100 rotates one week, the change in the magnetic field intensity measured by a single magnetic inductor 3 will have multiple periods. By setting multiple magnetic inductors 3 at different circumferential positions and avoiding making them correspond to the same phase of the periodic change in the magnetic field intensity, at least one magnetic inductor 3 can be located at a position where the magnetic field intensity changes greatly, avoiding all magnetic inductors 3 being simultaneously in an area where it is difficult to determine whether the rotating shaft 100 is rotating, and improving the sensitivity of the magnetic inductor 3.

[0040] As Figure 2 , in this embodiment, the two magnetic inductors 3 are arranged at an interval of 90°, and the period of the change in the magnetic field intensity in this embodiment is 60°.

[0041] In this embodiment, the magnetic inductor 3 is electrically connected to the monitoring device 200 to monitor the detection result of the magnetic inductor 3.

[0042] Embodiment 2 provides an air compressor dryer, including the rotation detection device of Embodiment 1, so it also includes all its beneficial effects.

[0043] The content described above can be implemented alone or in various combinations, and these variant ways are all within the protection scope of the present invention.

[0044] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0045] The above content is a further detailed description of the present utility model in combination with specific preferred embodiments, and it cannot be determined that the specific embodiments of the present utility model are only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model pertains, without departing from the concept of the present utility model, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present utility model.

Claims

1. A rotation detection device for detecting the rotation of a rotating shaft (100), characterized in that: include: A magnetic member (1) disposed on the rotating shaft (100) and rotating with the rotating shaft (100); a protective cover (2) disposed on the outside of the end of the rotating shaft (100), the protective cover (2) being sealed and connected to a device where the rotating shaft (100) is located; and a magnetic sensor (3) disposed on the inside of the protective cover (2) for detecting the rotation of the magnetic member (1) through the Hall effect; The protective cover (2) is provided with a threaded hole, and the magnetic sensor (3) is threadedly connected to the protective cover (2); The rotating shaft (100) is provided with a retaining spring (4), and the magnetic component (1) is mounted on the rotating shaft (100) via the retaining spring (4); The magnetic member (1) comprises at least 6 pairs of magnetic poles; the magnetic member (1) is a magnetic ring, and the magnetic ring is sleeved on the rotating shaft (100); the magnetic ring is magnetized at an oblique angle; The number of the magnetic sensors (3) is greater than or equal to 2; The plurality of magnetic poles of the magnetic component (1) are evenly distributed in the circumferential direction around the rotating shaft (100), and the plurality of magnetic sensors (3) are arranged at different circumferential positions to avoid having them correspond to the same phase of the periodic change in magnetic field intensity.

2. The rotation detection device according to claim 1, characterized in that: The protective cover (2) is threadedly connected to the equipment where the rotating shaft (100) is located.

3. The rotation detection device according to any one of claims 1 to 2, characterized in that: The magnetic sensor (3) is electrically connected to the monitoring device (200).

4. An air compression dryer, characterized in that: It comprises the rotation detection device as claimed in claim 3.

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