Speed measuring device for fan

Abstract

The utility model relates to the technical field of fan testing, and discloses a speed measuring device for a fan, which comprises a coupler main body, the coupler main body comprises a fan end coupler and a motor end coupler, the fan end coupler and the motor end coupler are distributed in a left-right butt joint mode, a first shaft body is inserted in the fan end coupler, and a second shaft body is inserted in the motor end coupler. A second shaft body is inserted into the motor end coupler, elastic pin parts are arranged at the top and the bottom of the butt joint position of the fan end coupler and the motor end coupler, the elastic pin parts are fixedly installed on the side face of the fan end coupler and penetrate through the motor end coupler, and a coupler protective cover is arranged above the coupler body. A magnetoelectric sensor is installed on the left side of the coupler shield and located above the fan end coupler, and the radial distance between the bottom end of the magnetoelectric sensor and the fan end coupler is 0.5-1mm. The fan end coupler has the advantages of being easy and convenient to use, stable in performance, high in anti-interference capacity, reliable in work, capable of adapting to various severe working conditions, capable of stably running for a long time and the like.

Description

Technical Field

[0001] This utility model belongs to the field of wind turbine testing technology, specifically a speed measuring device for wind turbines. Background Technology

[0002] With the rapid development of the national economy, fans are widely used in various fields of domestic economic production and life. Measuring the speed of fans is particularly important. By feeding the measured speed signal back to the system, the frequency converter can be controlled to make the fan run stably at a certain value. At the same time, measuring the speed of fans can determine whether the equipment needs to be inspected or replaced. In order to test the speed of fans more accurately and stably, this application proposes a speed measuring device for fans. Utility Model Content

[0003] To address the problems mentioned in the background art, this utility model provides the following technical solution: A speed measuring device for a wind turbine, comprising a coupling body, the coupling body including a wind turbine end coupling and a motor end coupling, the wind turbine end coupling and the motor end coupling being arranged in a left-right docking configuration, a first shaft being inserted into the wind turbine end coupling, and a second shaft being inserted into the motor end coupling, elastic pin portions being provided at the top and bottom of the docking point of the wind turbine end coupling and the motor end coupling, the elastic pin portions being fixedly installed on the side of the wind turbine end coupling and penetrating through the motor end coupling, a coupling cover being provided above the coupling body, and a magnetoelectric sensor being installed on the left side of the coupling cover and above the wind turbine end coupling, the bottom end of the magnetoelectric sensor being 0.5 to 1 mm radially spaced from the wind turbine end coupling.

[0004] Furthermore, multiple grooves are evenly provided on the side wall of the left end of the fan-end coupling, and the bottom end of the magnetoelectric sensor corresponds to the groove provided on the left end of the fan-end coupling.

[0005] Furthermore, a first flat key is provided on both sides of the first shaft, and a second flat key is provided on both sides of the second shaft.

[0006] Furthermore, the flexible pin section consists of a coupling pin, multiple coupling elastic rings, a coupling retaining ring, a flat washer, an elastic washer, and a hexagonal nut. Multiple coupling elastic rings are all fitted onto the coupling pin. The coupling retaining ring is fitted onto the coupling pin and abuts against the side of the coupling elastic ring. The flat washer and the elastic washer are sequentially fitted onto the end of the coupling pin. The hexagonal nut is threaded onto the end of the coupling pin and abuts against one side of the elastic washer.

[0007] Furthermore, the top and bottom of the fan-end coupling near the motor-end coupling are provided with mounting grooves. The coupling pins in the two elastic pin parts are respectively fixedly installed in the two mounting grooves on the side of the fan-end coupling. The coupling pins pass through the motor-end coupling, and the motor-end coupling abuts against the side of the coupling retaining ring. The flat washer, elastic washer and hexagonal nut abut against the other side of the motor-end coupling in sequence.

[0008] Compared with the prior art, the beneficial effects of this utility model are:

[0009] When the fan rotates, the magnetoelectric sensor receives pulse signals through the six grooves of the fan end coupling, and reads the fan's operating speed. This speed measuring device is easy to use, has stable performance, strong anti-interference ability, and reliable operation. Attached Figure Description

[0010] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0012] Figure 2 This is a side view of the structure of this utility model;

[0013] Figure 3 This is a partial enlarged structural schematic diagram of the present invention;

[0014] In the diagram: 1. First shaft; 2. First flat key; 3. Fan end coupling; 4. Magnetoelectric sensor; 5. Elastic pin; 6. Coupling cover; 7. Motor end coupling; 8. Second flat key; 9. Second shaft; 51. Coupling pin; 52. Coupling elastic ring; 53. Coupling retaining ring; 54. Flat washer; 55. Elastic washer; 56. Hexagonal nut. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0016] Depend on Figure 1-3The present invention includes a coupling body comprising a fan-end coupling 3 and a motor-end coupling 7, which are arranged side-by-side. A first shaft 1 is inserted into the fan-end coupling 3, and a second shaft 9 is inserted into the motor-end coupling 7. Elastic pins 5 are provided at the top and bottom of the joint between the fan-end coupling 3 and the motor-end coupling 7. The elastic pins 5 are fixedly installed on the side of the fan-end coupling 3 and pass through the motor-end coupling 7. A coupling cover 6 is provided on the top of the coupling body. A magnetoelectric sensor 4 is installed on the left side of the coupling cover 6, above the fan-end coupling 3. The radial distance between the bottom end of the magnetoelectric sensor 4 and the fan-end coupling 3 is 0.5–1 mm. The fan-end coupling 3 and the motor-end coupling 7 are connected together by the elastic pins 5. The coupling cover 6 is installed on top of the cover, ensuring the safe operation of the fan.

[0017] like Figure 1 and Figure 2 As shown, multiple grooves are evenly provided on the side wall of the left end of the fan-end coupling 3, and the bottom end of the magnetoelectric sensor 4 corresponds to the groove provided on the left end of the fan-end coupling 3.

[0018] like Figure 1 As shown, a first flat key 2 is provided on both sides of the first shaft 1, and a second flat key 8 is provided on both sides of the second shaft 9. The fan end coupling 3 is fitted onto the first shaft 1 via the first flat key 2. Similarly, the motor end coupling 7 is fitted onto the second shaft 9 via the second flat key 8.

[0019] like Figure 1 and Figure 3 As shown, the elastic pin section 5 consists of a coupling pin 51, multiple coupling elastic rings 52, a coupling retaining ring 53, a flat washer 54, an elastic washer 55, and a hexagonal nut 56. The multiple coupling elastic rings 52 are all sleeved on the coupling pin 51. The coupling retaining ring 53 is sleeved on the coupling pin 51 and abuts against the side of the coupling elastic ring 52. The flat washer 54 and the elastic washer 55 are sequentially sleeved on the end of the coupling pin 51. The hexagonal nut 56 is threaded onto the end of the coupling pin 51 and abuts against the side of the elastic washer 55. The elastic pin section 5 enables the connection between the fan end coupling 3 and the motor end coupling 7.

[0020] like Figure 1 and Figure 3 As shown, the top and bottom of the fan-end coupling 3 near the motor-end coupling 7 are provided with mounting grooves. The coupling pins 51 in the two elastic pin parts 5 are respectively fixedly installed in the two mounting grooves on the side of the fan-end coupling 3. The coupling pins 51 pass through the motor-end coupling 7, and the motor-end coupling 7 abuts against the side of the coupling retaining ring 53. The flat washer 54, the elastic washer 55 and the hexagonal nut 56 abut against the other side of the motor-end coupling 7 in sequence.

[0021] The method for measuring the fan speed based on the magnetoelectric sensor 4 uses the interface of the magnetoelectric sensor 4 to acquire the signal of the fan end coupling 3. It proposes to use an external precise clock to calibrate the acquisition period time base timer, correct the timing error caused by the single-chip microcomputer crystal oscillator clock error, and compensate for the interrupt jump time delay. This not only reduces the requirements for software and hardware, but also greatly improves the measurement accuracy.

[0022] Speed ​​measurement principle: Six grooves are evenly arranged on the fan end coupling 3. When the fan end coupling 3 rotates, the magnetoelectric sensor 4 receives pulse signals. The rotational speed can be obtained by counting the number of pulses. The number of grooves on the fan end coupling 3 is the number of lines received by the magnetoelectric sensor 4. The larger the number of lines, the more accurate the rotational speed measurement by the magnetoelectric sensor 4. Assuming that the magnetoelectric sensor 4 receives six lines, that is, there are six grooves on the fan end coupling 3, if six pulses are collected in one second, then the rotational speed received by the magnetoelectric sensor 4 is one revolution per second.

[0023] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A speed measuring device for a fan comprising a coupling body, characterized by: The coupling body comprises a fan end coupling (3) and a motor end coupling (7), the fan end coupling (3) and the motor end coupling (7) are in left and right butt joint distribution, a first shaft body (1) is inserted in the fan end coupling (3), and a second shaft body (9) is inserted in the motor end coupling (7), elastic pin portions (5) are arranged at the top and the bottom of the butt joint of the fan end coupling (3) and the motor end coupling (7), the elastic pin portions (5) are fixedly installed on the side surface of the fan end coupling (3) and penetrate through the motor end coupling (7), a coupling cover (6) is arranged above the coupling body, a magneto electric sensor (4) is installed on the left side of the coupling cover (6) and above the fan end coupling (3), and the radial distance between the bottom end of the magneto electric sensor (4) and the fan end coupling (3) is 0.5-1 mm. The elastic pin portion (5) is composed of a coupling pin (51), a plurality of coupling elastic rings (52), a coupling retainer ring (53), a flat washer (54), an elastic washer (55) and a hexagonal nut (56), the coupling elastic rings (52) are sleeved on the coupling pin (51), the coupling retainer ring (53) is sleeved on the coupling pin (51) and abuts against the side surface of the coupling elastic ring (52), the flat washer (54) and the elastic washer (55) are sleeved on the end of the coupling pin (51) in sequence, and the hexagonal nut (56) is threadedly sleeved on the end of the coupling pin (51) and abuts against one side of the elastic washer (55). The fan end coupling (3) is provided with mounting grooves at the top and the bottom of the side close to the motor end coupling (7), the coupling pins (51) of the two elastic pin portions (5) are fixedly installed in the two mounting grooves of the side surface of the fan end coupling (3), the coupling pin (51) penetrates through the motor end coupling (7), the motor end coupling (7) abuts against the side surface of the coupling retainer ring (53), and the flat washer (54), the elastic washer (55) and the hexagonal nut (56) abut against the other side of the motor end coupling (7) in sequence.

2. A speed measuring device for a fan as claimed in claim 1, characterized in that: The side wall of the left end of the fan end coupling (3) is uniformly provided with a plurality of grooves, and the bottom end of the magneto electric sensor (4) corresponds to the groove provided at the left end of the fan end coupling (3).

3. The speed measuring device for a fan according to claim 1, characterized in that: The first shaft body (1) is provided with first flat keys (2) on both sides, and the second shaft body (9) is provided with second flat keys (8) on both sides.

Images