Detection system of mechanical interruption electromagnet for shutdown of steam turbine

Abstract

The utility model discloses a detection system of a mechanical interrupting electromagnet for shutdown of a steam turbine, and relates to the technical field of mechanical interrupting electromagnet detection. According to the main technical scheme, the device comprises a voltage-stabilized power supply, a rectifier, a test switch, an online electrical parameter detector, a sensor, a torsion detector and an infrared thermometer, wherein the rectifier is connected with the voltage-stabilized power supply; the test switch is connected with the rectifier; the on-line electrical parameter detector is connected with the test switch, and the on-line electrical parameter detector is connected with an electromagnetic coil of the mechanical interrupting electromagnet; the sensor is arranged on an impact head of the detection device for the mechanical interruption electromagnet, and the sensor is used for detecting the torsion when an ejector rod of the mechanical interruption electromagnet impacts the impact head; the torsion detector is connected with the sensor; and the infrared thermometer detects the temperature of the electromagnetic coil when the ejector rod of the mechanical interruption electromagnet impacts the impact head of the detection device. The purposes of simultaneously detecting the current, the torsion and the temperature of the mechanically interrupting electromagnet, shortening the detection time and improving the detection efficiency are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical intercepting electromagnet detection technical field, concretely relates to a detection system of mechanical intercepting electromagnet for steam turbine shutdown. BACKGROUND

[0002] Mechanical intercepting electromagnet is a safety device for quickly closing steam valve to stop supplying steam to steam turbine when steam turbine is shutdown.

[0003] In order to ensure the performance of mechanical intercepting electromagnet, the current, temperature, torsion and other performance indexes of mechanical intercepting electromagnet when energized need to be detected before mechanical intercepting electromagnet is shipped. The detection system for mechanical intercepting electromagnet in prior art is difficult to realize the synchronous detection of multiple performance indexes in use process, greatly prolongs the detection time of mechanical intercepting electromagnet performance parameters, and reduces the detection efficiency. UTILITY MODEL CONTENT

[0004] The utility model discloses a detection system of mechanical intercepting electromagnet for steam turbine shutdown, which solves the problem of the detection system for mechanical intercepting electromagnet in prior art, which is difficult to realize the synchronous detection of multiple performance indexes in use process, greatly prolongs the detection time of mechanical intercepting electromagnet performance parameters, and reduces the detection efficiency.

[0005] To solve the above technical problems, the utility model adopts the following technical scheme:

[0006] A detection system of mechanical intercepting electromagnet for steam turbine shutdown, comprising a stabilized power supply, a rectifier, a test switch, an online electrical parameter detector, a sensor, a torsion detector and an infrared temperature detector, the input end of the rectifier is connected with the output end of the stabilized power supply; the input end of the test switch is connected with the output end of the rectifier; the input end of the online electrical parameter detector is connected with the output end of the test switch, the output end of the online electrical parameter detector is used for being connected with the electromagnetic coil of mechanical intercepting electromagnet, and the online electrical parameter detector is used for detecting the current when the impact head of the top rod impact detection device of mechanical intercepting electromagnet impacts; the sensor is used for being arranged on the impact head of the detection device for mechanical intercepting electromagnet, and the sensor is used for detecting the torsion when the top rod of mechanical intercepting electromagnet impacts the impact head; the input end of the torsion detector is connected with the output end of the sensor; the infrared temperature detector is used for detecting the temperature of the electromagnetic coil when the impact head of the top rod impact detection device of mechanical intercepting electromagnet impacts.

[0007] Further technical scheme is that the input end of the stabilized power supply is used for connecting AC220V, and the output end of the stabilized power supply outputs AC220V and AC110V.

[0008] Further technical solutions are: the input end of the rectifier is connected with the output end of the voltage stabilizing power supply, and the output end of the rectifier outputs DC 220V or DC 110V.

[0009] Further technical solutions are: the detection system further comprises a timer and a wave recorder; the input end of the timer is connected with the output end of the test switch; the output end of the timer is connected with the input end of the online electrical parameter detector, the input end of the sensor and the input end of the infrared temperature detector; the input end of the wave recorder is connected with the output end of the online electrical parameter detector, the output end of the timer, the output end of the torque detector and the output end of the infrared temperature detector.

[0010] Further technical solutions are: the detection system further comprises a diode; the input end of the diode is connected with the output end of the online electrical parameter detector, and the output end of the diode and the output end of the online electrical parameter detector are used for being connected with the electromagnetic coil of the mechanical blocking electromagnet.

[0011] Further technical solutions are: the rated voltage of the diode is 500V.

[0012] Further technical solutions are: the rated current of the diode is 10A.

[0013] Further technical solutions are: the online electrical parameter detector is further used for detecting the voltage and power when the impact head of the top rod impact detection device of the mechanical blocking electromagnet is impacted.

[0014] Compared with the prior art, the utility model has the beneficial effects that:

[0015] The current, torque and temperature of the mechanical blocking electromagnet can be detected at the same time, so that the detection time is shortened and the detection efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is an electrical block diagram of the detection system of the mechanical blocking electromagnet for the steam turbine shutdown. DETAILED DESCRIPTION

[0017] The utility model will be further described below in combination with the drawings.

[0018] Embodiment 1

[0019] The embodiment provides a detection system of a mechanical blocking electromagnet for steam turbine shutdown, which comprises a test switch, an online electrical parameter detector, a torque detector, an infrared temperature detector, a sensor and a mechanical blocking electromagnet. Figure 1The power supply, the rectifier, the test switch, the on-line electrical parameter detector, the sensor, the torque detector and the infrared temperature detector are connected in series, the input end of the rectifier is connected with the output end of the power supply, the input end of the test switch is connected with the output end of the rectifier, the input end of the on-line electrical parameter detector is connected with the output end of the test switch, the output end of the on-line electrical parameter detector is connected with the electromagnetic coil of the mechanical cut-off electromagnet, the on-line electrical parameter detector is used for detecting the current when the top rod of the mechanical cut-off electromagnet hits the impact head of the detection device, the sensor is arranged on the impact head of the detection device of the mechanical cut-off electromagnet, the sensor is used for detecting the torque when the top rod of the mechanical cut-off electromagnet hits the impact head, the input end of the torque detector is connected with the output end of the sensor, and the infrared temperature detector is used for detecting the temperature of the electromagnetic coil when the top rod of the mechanical cut-off electromagnet hits the impact head of the detection device.

[0020] In the embodiment, the input end of the power supply is connected with AC 220V, and the output end of the power supply outputs AC 220V and AC 110V.

[0021] In the embodiment, the input end of the rectifier is connected with the output end of the power supply, and the output end of the rectifier outputs DC 220V or DC 110V.

[0022] In the embodiment, the input end of the power supply is connected with AC 220V, and the output end of the power supply outputs AC 220V and AC 110V.

[0023] The rectifier can adopt KBPC108, KBP06 and the like, the input end of the rectifier is connected with the output end of the power supply, and the output end of the rectifier outputs 220V DC and 110V DC. The output end of the rectifier is connected with the electromagnetic coil of the mechanical cut-off electromagnet. The rectifier converts AC into DC, so that the mechanical cut-off electromagnet is always in the preset DC working voltage during the whole test process, thereby reducing the risk of inaccurate test results caused by voltage fluctuation. Meanwhile, the rectifier outputs 220V DC and 110V DC, so as to adapt to the mechanical cut-off electromagnet with different DC voltage inputs.

[0024] The input end of the test switch is connected with the output end of the rectifier.

[0025] The online electrical parameter detector can adopt a voltage current power torque detector with model FLUKE 17B+, the input end of the online electrical parameter detector is connected with the output end of the test switch, and the output end of the online electrical parameter detector is used to be connected with the electromagnetic coil of the mechanical intercepting electromagnet. It is expected to achieve the purpose of detecting the current of the electromagnetic coil of the mechanical intercepting electromagnet when the top rod of the mechanical intercepting electromagnet impacts the impact head through the online electrical parameter detector.

[0026] The sensor can adopt a Jinuo JLBS-II S type tension sensor, and the sensor is installed on the impact head of the mechanical intercepting electromagnet detection device through screwing, clamping and other modes. It is expected to achieve the purpose of detecting the torque when the top rod of the mechanical intercepting electromagnet impacts the impact head through the sensor.

[0027] The torque detector can adopt an AI LI GU digital display push-pull force gauge, the input end of the torque detector is connected with the output end of the sensor, so as to achieve the purpose of displaying torque data, so that the operator can check the torque test result during the test.

[0028] The infrared temperature detector can adopt a high-precision infrared temperature sensor with model FST600-400, or a GM1150 infrared temperature detector. It is expected to achieve the purpose of non-contact measurement of the temperature of the electromagnetic coil of the mechanical intercepting electromagnet when the top rod of the mechanical intercepting electromagnet impacts the impact head through the infrared temperature detector.

[0029] The working principle of the detection system of the mechanical intercepting electromagnet for turbine shutdown in the embodiment is as follows:

[0030] Before the test, first, confirm that the stroke of the armature on the mechanical intercepting electromagnet is 25.4mm±0.1, and confirm that the armature on the mechanical intercepting electromagnet runs freely without jamming. Confirm the armature of the mechanical intercepting electromagnet to be detected at least 5 times;

[0031] Secondly, check whether the output voltage of the rectifier on the output end of the stabilized power supply is consistent with the voltage label of the mechanical intercepting electromagnet to be detected; when the output voltage of the rectifier on the output end of the stabilized power supply is consistent with the voltage label on the mechanical intercepting electromagnet to be detected, clamp the input end of the electromagnetic coil on the mechanical intercepting electromagnet by using the alligator clip on the output end of the online electrical parameter detector;

[0032] During the test, first, turn on the test switch. At this time, the armature of the mechanical intercepting electromagnet drives the top rod of the mechanical intercepting electromagnet to move upward to the maximum stroke position of the armature;

[0033] Secondly, rotate the manual rotation adjustment handle of the detection device for mechanical interlocking electromagnet until the impact head of the detection device for mechanical interlocking electromagnet abuts against the top rod of the mechanical interlocking electromagnet; at this time, turn off the test switch and rotate the manual rotation adjustment handle of the detection device for mechanical interlocking electromagnet so that the impact head of the detection device for mechanical interlocking electromagnet moves 1-1.5 mm towards the top rod of the mechanical interlocking electromagnet again;

[0034] Then, turn on the test switch again. At this time, the top rod of the mechanical interlocking electromagnet impacts the impact head of the detection device for mechanical interlocking electromagnet. Meanwhile, the on-line electrical parameter detector detects the electromagnetic coil current of the mechanical interlocking electromagnet, the sensor detects the torsion, and the infrared temperature detector detects the electromagnetic coil temperature of the mechanical interlocking electromagnet. The purpose is to achieve the simultaneous detection of the current, torsion and temperature of the mechanical interlocking electromagnet, thereby shortening the detection time and improving the detection efficiency.

[0035] Finally, record the torsion, current and temperature at multiple time points in the energized state. And mark the mechanical interlocking electromagnet with minimum torsion not less than 260 N as a qualified product.

[0036] In a preferred embodiment, the on-line electrical parameter detector is also used to detect the voltage and power when the top rod of the mechanical interlocking electromagnet impacts the impact head of the detection device. The purpose is to better evaluate the performance of the mechanical interlocking electromagnet by detecting the electromagnetic coil current, voltage and power of the mechanical interlocking electromagnet detected by the on-line electrical parameter detector when the test switch is turned on again.

[0037] Example 2

[0038] Based on the above-mentioned example 1, in this example, as shown in Figure 1 The detection system further comprises a timer and a wave recorder; the input end of the timer is connected with the output end of the test switch; the output end of the timer is connected with the input end of the on-line electrical parameter detector, the input end of the sensor and the input end of the infrared temperature detector; the input end of the wave recorder is connected with the output end of the on-line electrical parameter detector, the output end of the timer, the output end of the torsion detector and the output end of the infrared temperature detector.

[0039] Exemplarily, in the implementation process, the detection system further comprises a timer and a wave recorder. The timer can adopt a TMX series timer of OMRON, the input end of the timer is connected with the output end of the test switch, and the output end of the timer is connected with the input end of the online electrical parameter detector, the input end of the sensor (for torque measurement), and the input end of the infrared temperature detector. It is expected to achieve the purpose of synchronously triggering the online electrical parameter detector, the sensor, and the infrared temperature detector to start working and start timing when the test switch is opened, so as to ensure that the measurements of the online electrical parameter detector, the sensor, and the infrared temperature detector all start from the same time point.

[0040] The wave recorder can adopt an MR8870-10 Memory H i Corder of HIOKI, and the input end of the wave recorder is connected with the output end of the online electrical parameter detector (current), the output end of the timer (time stamp), the output end of the torque detector (torque), and the output end of the infrared temperature detector (temperature). It is expected to achieve the purpose of collecting current, torque, temperature, and time stamp in real time through the wave recorder to construct time-current, time-temperature, and time-torque curves.

[0041] In the use process, when the test switch is opened again. The top rod of the mechanical shutdown electromagnet impacts the impact head of the mechanical shutdown electromagnet detection device. At the same time, the timer starts timing, the online electrical parameter detector detects the electromagnetic coil current of the mechanical shutdown electromagnet, the sensor detects the torque, and the infrared temperature detector detects the electromagnetic coil temperature of the mechanical shutdown electromagnet.

[0042] Finally, the torque, current, and temperature of the timer at multiple time points in the power-on state are recorded. And the time-current, time-temperature, and time-torque curves are constructed through the wave recorder. It is expected to achieve the purpose of accurately controlling the starting time of the test process, and then ensuring the simultaneity of current, torque, and temperature and other different parameter measurements, so as to improve the consistency and reliability of the test results. At the same time, it achieves the purpose of recording the test data to facilitate the operator to view the test results.

[0043] Embodiment 3

[0044] In order to reduce the risk of damage to the online electrical parameter detector, the sensor, the torque detector, and the infrared temperature detector and other equipment caused by excessive instantaneous current in the test process. On the basis of the above-mentioned embodiment 1, in this embodiment, as shown in the figure, the detection system further comprises a diode; the input end of the diode is connected with the output end of the online electrical parameter detector, and the output end of the diode and the output end of the online electrical parameter detector are both used for being connected with the electromagnetic coil of the mechanical shutdown electromagnet. Figure 1

[0045] In this embodiment, the rated voltage of the diode is 500V.​

[0046] In the embodiment, the diode has a rated current of 10 A.

[0047] For example, in the implementation process, the detection system further comprises a diode, which can be a transient suppression diode such as DO-218AB, SMA / DO-214AC, etc. The diode has a rated voltage of 500 V and a rated current of 10 A. The input end (negative electrode) of the diode is connected to the output end of the online electrical parameter detector, and the output end (positive electrode) of the diode and the output end of the online electrical parameter detector are jointly connected to the electromagnetic coil of the mechanical shutdown electromagnet.

[0048] In use, when the test switch is open, the current will flow through the diode to the electromagnetic coil. Due to the unidirectional conduction characteristic of the diode, the diode can play a role in the following two aspects:

[0049] Prevent reverse current: If the current in the electromagnetic coil of the mechanical shutdown electromagnet is suddenly interrupted (for example, due to the closing of the test switch), the electromagnetic coil will generate a reverse electromotive force, which may cause damage to the devices such as the online electrical parameter detector, the sensor, the torque detector, and the infrared thermometer. The diode can allow current to flow in one direction, reducing the risk of reverse current returning to the devices such as the online electrical parameter detector, the sensor, the torque detector, and the infrared thermometer.

[0050] Limit surge current: When the electromagnetic coil of the mechanical shutdown electromagnet is first powered on, due to the inductive nature of the electromagnetic coil, a large initial surge current may be generated. The diode can help to disperse the initial surge current, reduce the current intensity directly impacting the devices such as the online electrical parameter detector, the sensor, the torque detector, and the infrared thermometer, thereby playing a protective role. It is expected that by adding the diode, the risk of damage to the devices such as the online electrical parameter detector, the sensor, the torque detector, and the infrared thermometer caused by transient large current is effectively reduced, thereby prolonging the service life of the devices such as the online electrical parameter detector, the sensor, the torque detector, and the infrared thermometer.

[0051] Although the utility model has been described herein with reference to a number of explanatory embodiments of the utility model, it should be understood that those skilled in the art can design many other modifications and implementations, which will fall within the scope and spirit of the principles disclosed in the present application. More specifically, within the scope of the present application, drawings and claims, various modifications and improvements can be made to the constituent components and / or layout of the subject combination layout. In addition to the modifications and improvements to the constituent components and / or layout, other uses will be apparent to those skilled in the art.

Claims

1. A detection system for a mechanical shut-off electromagnet used for turbine shutdown, characterized in that, include: Regulated power supply; A rectifier, the input terminal of which is connected to the output terminal of the regulated power supply; A test switch, the input terminal of which is connected to the output terminal of the rectifier; An online electrical parameter tester, wherein the input terminal of the online electrical parameter tester is connected to the output terminal of the test switch, the output terminal of the online electrical parameter tester is used to connect to the electromagnetic coil of the mechanical interruption electromagnet, and the online electrical parameter tester is used to detect the current when the top rod of the mechanical interruption electromagnet impacts the impact head of the detection device. A sensor is used to be installed on the impact head of the detection device for the mechanical interruption electromagnet, and the sensor is used to detect the torque when the push rod of the mechanical interruption electromagnet hits the impact head. A torque tester, wherein the input terminal of the torque tester is connected to the output terminal of the sensor; An infrared thermometer is used to detect the temperature of the electromagnetic coil when the push rod of the mechanically interrupted electromagnet impacts the impact head of the detection device.

2. The detection system according to claim 1, characterized in that: The input terminal of the regulated power supply is used to connect to AC220V, and the output terminal of the regulated power supply outputs AC220V and AC110V.

3. The detection system according to claim 2, characterized in that: The input terminal of the rectifier is connected to the output terminal of the regulated power supply, and the output terminal of the rectifier outputs DC220V or DC110V.

4. The detection system according to claim 1, characterized in that: It also includes timers and waveform recorders; The input terminal of the timer is connected to the output terminal of the test switch; The output terminal of the timer is connected to the input terminal of the online electrical parameter detector, the input terminal of the sensor, and the input terminal of the infrared thermometer. The input terminal of the waveform recorder is connected to the output terminals of the online electrical parameter detector, the timer, the torque detector, and the infrared thermometer.

5. The detection system according to claim 1, characterized in that: It also includes diodes; The input terminal of the diode is connected to the output terminal of the online electrical parameter detector, and both the output terminal of the diode and the output terminal of the online electrical parameter detector are used to connect to the electromagnetic coil of the mechanically shut-off electromagnet.

6. The detection system according to claim 5, characterized in that: The diode has a rated voltage of 500V.

7. The detection system according to claim 6, characterized in that: The diode has a rated current of 10A.

8. The detection system according to claim 1, characterized in that: The online electrical parameter detector is also used to detect the voltage and power of the impact head of the top rod impact detection device of the mechanically interrupted electromagnet.

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