Rotating speed measuring device for hydrogen turbine expander

Abstract

The rotating speed measuring device comprises a rotating shaft connected with the output end of the expansion machine, the rotating shaft penetrates through a shell, the shell is fixed through a support, a power source is arranged in the shell, a photoelectric coded disc is arranged on the rotating shaft, a light source module is arranged on one side of the photoelectric coded disc, and the light source module is arranged on the other side of the photoelectric coded disc. And a fixed grating and a photosensitive sensor are sequentially arranged on the other side of the photoelectric coded disc. The rotating speed measuring device for the rotating shaft of the expansion machine adopts an integrated design, is simple in structure and convenient to install, and can normally work in a hydrogen environment; the dynamic response speed is high, high-speed rotation can be tracked in real time, the rotating speed monitoring requirement of rapid change of the hydrogen turbo expander is met, and errors caused by signal delay are avoided; the micro angle change of the rotating shaft can be accurately captured, and the method is suitable for precise rotating speed measurement under high-speed operation of the hydrogen turbine expander; optical signals of the photoelectric encoder are not easily interfered by electromagnetic interference, and the photoelectric encoder is more reliable than a magnetoelectric sensor.

Description

TECHNICAL FIELD

[0001] The utility model relates to refrigeration and low temperature engineering test equipment technical field especially relates to a hydrogen turbine expander rotating speed measuring device. BACKGROUND

[0002] With the transformation of global energy structure to clean and low carbon, hydrogen energy becomes one of the core energy carriers to achieve the "double carbon" goal due to its zero carbon emission, high energy density and wide applicability. As the core equipment of energy conversion and regulation in the hydrogen energy industry chain, hydrogen turbine expander plays an irreplaceable role in key scenes such as aviation, aerospace, superconducting field and large air separation. The patent relates to a hydrogen turbine expander rotating speed measuring device, mainly used for real-time rotating speed monitoring and control of the rotor of the expander.

[0003] At present, the rotating speed measurement of hydrogen turbine expander mainly relies on traditional sensor technology, and adopts split design (such as external gear disc + independent probe), which needs to install speed measuring gear or reflective marker on the turbine shaft, resulting in complex structure and large space occupation. Due to the wide range of hydrogen turbine expander rotating speed, traditional sensors are limited by sampling frequency and signal processing algorithm, and it is difficult to maintain linear response in wide speed range, especially in high frequency band, which may cause signal loss or lag, affecting the real-time performance of the control system.

[0004] And there are significant defects in the special environment of hydrogen: insufficient temperature resistance and environmental adaptability: traditional magneto or photoelectric sensor may cause performance attenuation in the high pressure and low temperature environment of hydrogen energy system, and low temperature hydrogen medium may cause embrittlement of sensor material, reducing the measurement accuracy or even failing. UTILITY MODEL CONTENT

[0005] The utility model aims at solving the shortcomings in the prior art and provides a hydrogen turbine expander rotating speed measuring device.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] A hydrogen turbine expander rotating speed measuring device, comprising a rotating shaft connected with the output end of the expander, the rotating shaft penetrating through the shell, the shell being fixed through the support, the shell being built-in with a power supply, a photoelectric encoder being arranged on the rotating shaft, a light source module being arranged on one side of the photoelectric encoder, a fixed grating and a photosensitive sensor being arranged on the other side of the photoelectric encoder in sequence, the photosensitive sensor being electrically connected with an external rotating speed signal monitoring system.

[0008] Preferably, the light source module comprises a light emitting diode and a prism, and the prism is located between the light emitting diode and the photoelectric encoder.

[0009] Preferably, a bearing is arranged at the connection between the rotating shaft and the shell.

[0010] Preferably, the photoelectric encoder is coaxially arranged with the rotating shaft and runs at the same speed.

[0011] Preferably, the shell is a semi-open structure.

[0012] Compared with the prior art, the utility model has the beneficial effects that:

[0013] 1. The expansion machine rotating shaft rotating speed measuring device adopts an integrated design, is simple in structure, convenient to install, and can normally work in a hydrogen environment;

[0014] 2. The dynamic response speed is fast, can track high-speed rotation in real time, meets the rotating speed monitoring demand of the rapid change of the hydrogen turbine expansion machine, avoids the error caused by signal delay, can accurately capture the slight angle change of the rotating shaft, and is suitable for the precise rotating speed measurement of the hydrogen turbine expansion machine under high-speed operation;

[0015] 3. The optical signal of the photoelectric encoder is not easy to be interfered by electromagnetic interference, and is more reliable compared with a magneto-electric sensor. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more specifically and intuitively illustrate the technical scheme in the embodiment of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below.

[0017] Fig. 1 The structural schematic diagram of the utility model is provided.

[0018] Fig. 2 The signal acquisition schematic diagram of the utility model is provided.

[0019] In the drawing: light emitting diode 1, prism 2, fixed grating 3, photosensitive sensor 4, rotating shaft 5, bearing 6, shell 7, photoelectric encoder 8, power supply 9. DETAILED DESCRIPTION

[0020] The technical scheme in the embodiment of the utility model will be clearly and completely described below in combination with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiments.

[0021] Referring to Figs. 1-2 A hydrogen turbine expansion machine rotating speed measuring device, comprising a rotating shaft 5 connected with an output end of the expansion machine, the rotating shaft 5 penetrates a shell 7, the shell 7 is fixed through a support, the shell 7 is internally provided with a power supply 9, the rotating shaft 5 is provided with a photoelectric encoder 8, one side of the photoelectric encoder 8 is provided with a light source module, the other side of the photoelectric encoder 8 is sequentially provided with a fixed grating 3 and a photosensitive sensor 4, and the photosensitive sensor 4 is electrically connected with an external rotating speed signal monitoring system.

[0022] Because the rated speed of the expander is high and considering the possible interference in the measuring process, the speed measuring method adopts the frequency method (M method).

[0023] The frequency method mainly relies on the resolution of the photoelectric encoder 8 to measure the speed, that is, the number of pulses generated by the photoelectric encoder 8 in a specified time interval is measured to measure the speed, and the frequency method is simple to implement and suitable for fast changing speed measurement.

[0024] Suppose that the number of pulses generated by the pulse generator is N per revolution of the rotating shaft 5, and the total number of pulses measured in a specified time interval T is M, then the speed of the motor per minute can be calculated .

[0025] In the embodiment, the light source module includes a light emitting diode 1 and a prism 2, the prism 2 is located between the light emitting diode 1 and the photoelectric encoder 8, the light emitting diode 1 and the prism 2 form a light source for providing a stable light source, and the photosensitive sensor 4 receives the transmitted light signal and converts it into a pulse signal, and the position of the photoelectric encoder 8 adjusts the light source and the position of the photosensitive sensor 4 to ensure good signal reception.

[0026] The photosensitive sensor 4 is electrically connected to an external rotating speed signal monitoring system to form a detection device that detects a number of pulse signals, and by calculating the number of pulses output by the photoelectric encoder per second, the current rotating speed of the rotating shaft can be reflected.

[0027] In the embodiment, the rotating shaft 5 is provided with a bearing 6 at the connection with the housing 7, the photoelectric encoder 8 is coaxially arranged with the rotating shaft 5 and runs at the same speed, and the housing 7 is a semi-open structure.

[0028] 1. The hydrogen turbine expander speed measuring device is different from the traditional speed measuring, and through the coaxiality adjustment mechanism of the photoelectric encoder and the rotating shaft, the influence of the installation error on the measurement accuracy can be reduced.

[0029] 2. The dynamic response speed is fast, the high-speed rotation can be tracked in real time, the electromagnetic interference is not easy to be caused, and the device can work normally in a hydrogen environment.

[0030] The above only describes the preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A hydrogen turbine expander rotational speed measuring device, comprising a rotating shaft (5) connected to the output end of the expander, the rotating shaft (5) penetrating a housing (7), the housing (7) being fixed by a support, the housing (7) being internally provided with a power supply (9), characterized in that, The rotating shaft (5) is provided with an optical encoder (8), one side of the optical encoder (8) is provided with a light source module, the other side of the optical encoder (8) is sequentially provided with a fixed grating (3) and a photosensitive sensor (4), and the photosensitive sensor (4) is electrically connected with an external rotating speed signal monitoring system.

2. A hydrogen turbine expander rotational speed measuring device according to claim 1, characterized by The light source module comprises a light emitting diode (1) and a prism (2), and the prism (2) is located between the light emitting diode (1) and the optical encoder (8).

3. A hydrogen turbine expander rotational speed measuring device according to claim 2, characterized by The rotating shaft (5) is provided with a bearing (6) at the connection with the shell (7).

4. A hydrogen turbine expander rotational speed measuring device according to claim 3, characterized by The optical encoder (8) is coaxially arranged with the rotating shaft (5) and runs at the same speed.

5. A hydrogen turbine expander rotational speed measuring device according to claim 4, characterized by The shell (7) is a semi-open structure.

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