CN201623463U - Steam turbine over-speed protection device with abnormal rotation speed alarm function - Google Patents

Abstract

The utility model discloses a steam turbine over-speed protection device with an abnormal rotation speed alarm function, which comprises three groups of speed detecting circuits which independently work. Each group of speed detecting circuits comprises an abnormal rotation speed alarm circuit; the abnormal rotation speed alarm circuit comprises a delay switch circuit and a rotation speed comparison circuit; an input end of the delay switch circuit is connected with an output end of a sensor signal adjusting circuit of the protection device; an output end of the delay switch circuit is connected with an input end of the rotation speed comparison circuit; an output end of the rotation speed comparison circuit is connected with a single chip microcomputer; a control end of the delay switch circuit is connected with the single chip microcomputer; and a control end of the rotation speed comparison circuit is connected with the single chip microcomputer. The steam turbine over-speed protection device detects whether or not the rotation speed of a steam turbine is in normal condition through the abnormal rotation speed alarm circuit of each group of the speed detecting circuit to judge installation quality of the steam turbine.

Description

TURBINE OVERSPEED PROTECTION DEVICE with rotating speed abnormal alarm function

Technical field

The utility model relates to a kind of TURBINE OVERSPEED PROTECTION DEVICE.

Background technology

The steamer function is converted into the external combustion rotary machinery of mechanical energy with steam thermal energy, enters behind the steam turbine successively the mechanical energy that nozzle and movable vane through a series of loop configurations are converted into the heat energy of steam the turbine rotor rotation from the steam of boiler.Steam turbine is as power part, and it can provide huge kinetic energy, thereby can be applied to industries such as iron and steel, generating.Because the steam turbine complex structure, bulky, the huge characteristics of power output variable have determined the installation accuracy height of steam turbine, installation process complexity.Steam turbine is installed defective meeting influence the steam turbine operate as normal: exist rotating speed not reach the rotating speed anomaly of required value at the appointed time in the practical work process, this is because steam turbine is installed excessive the causing of resistance that the improper turbine rotor that causes is subjected to; The shutdown situation appears in reason owing to installing improperly in serious meeting.Whether prior art can detect turbine speed without any effective instrument and equipment normal, just can not find in time that also steam turbine installs situation improperly, existing detection means all leans on operating personnel to rely on other parameter and experience to judge the installation situation of steam turbine, could determine after critical conditions occurring all that generally the steam turbine installation is defective.

Summary of the invention

The technical problems to be solved in the utility model provides a kind of TURBINE OVERSPEED PROTECTION DEVICE, and it is disobeyed and judges that artificially inspection just can measure the unusual situation of turbine speed and initiatively protect steam turbine, and then can find installation question early.

For solving the problems of the technologies described above; the utility model adopts following technical scheme: this TURBINE OVERSPEED PROTECTION DEVICE comprises three groups of velocity checking circuits that work alone; three select two circuit; the protection executive circuit; the output of described velocity checking circuits all selects the input of two circuit to be connected with three; described three select the output of two circuit to be connected with the input of protection executive circuit; described velocity checking circuits comprises single-chip microcomputer at least; sensor signal is adjusted circuit and input equipment; the output that described sensor signal is adjusted circuit is connected with single-chip microcomputer; described input equipment is connected with single-chip microcomputer; described velocity checking circuits also comprises rotating speed abnormal alarm circuit; described rotating speed abnormal alarm circuit comprises delay switch circuit and rotating speed comparison circuit; the input of described delay switch circuit is connected with the output that sensor signal is adjusted circuit; the output of described delay switch circuit is connected with the input of rotating speed comparison circuit; the output of described rotating speed comparison circuit is connected with single-chip microcomputer; the control end of described delay switch circuit is connected with single-chip microcomputer, and the control end of described rotating speed comparison circuit is connected with single-chip microcomputer.Delay switch circuit can be adjusted circuit from sensor signal and obtain tach signal, and in the time period that allows, tach signal is passed to the rotating speed comparison circuit, the rotating speed comparison circuit obtains maximum tachometer value and compares with preset value in this time period, and then realizes judging whether turbine speed is unusual.

As of the present utility model preferred, described velocity checking circuits also comprises data display circuit, the unusual indicator light of rotating speed, and described data display circuit, the unusual indicator light of rotating speed all are connected with single-chip microcomputer.Data display circuit can show turbine speed in real time, and then is convenient to the staff and learns the detected turbine speed of this velocity checking circuits intuitively.The unusual indicator light of rotating speed can show intuitively whether turbine speed unusual condition occurred.

As of the present utility model preferred, described velocity checking circuits also comprises external memory, and described external memory is connected with single-chip microcomputer.External memory is convenient to velocity checking circuits and is stored more multidata, realizes more refined control process; Also help storing the logging of longer time, so that call the historic state of thumbing steam turbine in the future.

The utility model adopts technique scheme: whether TURBINE OVERSPEED PROTECTION DEVICE is in abnormal conditions by the rotating speed abnormal alarm electric circuit inspection turbine speed of every group of velocity checking circuits, and then judges the steam turbine installation quality.TURBINE OVERSPEED PROTECTION DEVICE has had the function of rotating speed abnormal alarm thus, realizes the automatic detection to the rotating speed situation, has improved the TURBINE OVERSPEED PROTECTION DEVICE automaticity.The function that TURBINE OVERSPEED PROTECTION DEVICE has had a rotating speed abnormal alarm just can start the back at steam turbine and find that in time the steam turbine of hiding install underproof problem, and then is convenient to operating personnel and gets rid of unsafe factor; Simultaneously also be convenient to steam turbine is safeguarded.

Description of drawings

Below in conjunction with the drawings and specific embodiments the utility model is further specified.

Fig. 1 is the electrical block diagram that the utlity model has the TURBINE OVERSPEED PROTECTION DEVICE of rotating speed abnormal alarm function;

Fig. 2 is the structural representation of velocity checking circuits that the utlity model has the TURBINE OVERSPEED PROTECTION DEVICE of rotating speed abnormal alarm function.

Embodiment

As shown in Figure 1, TURBINE OVERSPEED PROTECTION DEVICE has comprised that three groups of velocity checking circuits that work alone, three select two circuit and protection executive circuit.As shown in Figure 2, velocity checking circuits comprises sensor signal adjustment circuit, rotating speed abnormal alarm circuit, single-chip microcomputer, data display circuit, the unusual indicator light of rotating speed, input equipment, external memory.Rotating speed abnormal alarm circuit is made up of than circuit delay switch circuit and rotating ratio.The output that sensor signal is adjusted circuit is connected with single-chip microcomputer, and another output is connected with the input of delay switch circuit, and the control end that delay switch circuit is used to receive control command and delay time the assignment signal is connected with single-chip microcomputer.The output of delay switch circuit is connected with the input of rotating speed comparison circuit, and the control end that the rotating speed comparison circuit is used to receive control command and rotating speed assignment signal is connected with single-chip microcomputer, and the output of rotating speed comparison circuit is connected with single-chip microcomputer.Delay switch circuit receives delay time length assignment signal and enabling signal from single-chip microcomputer output by control end, so behind delayed startup in the future the turbine speed signal of autobiography sensor signal adjustment circuit send the rotating speed comparison circuit to.The rotating speed comparison circuit receives reference rotation velocity assignment signal and the enabling signal of exporting from monolithic by control end, and then receives the turbine speed signal of adjusting circuit from sensor signal between the starting period at delay switch circuit.Data display circuit, the unusual indicator light of rotating speed, external memory all are connected with single-chip microcomputer, data display circuit is provided with the digital display tube of LED, on data display circuit, intuitively manifest after the turbine speed signal process single-chip microcomputer calculation process from sensor signal adjustment circuit, be convenient to the operator and read with the numerical value form.Input equipment is a keyboard, can call the function of single-chip microcomputer inside by it, the delay time that can the input time delay switching circuit and the reference rotation velocity value of rotating speed comparison circuit.The trip signal output and three of single-chip microcomputer selects the input of two circuit to be connected, and then the output of three groups of velocity checking circuits selects three inputs on two circuit to be connected with three respectively, and three select the output of two circuit to be connected with the input of protection executive circuit.

This TURBINE OVERSPEED PROTECTION DEVICE starts the back single-chip microcomputer and obtains the turbine speed signal from sensor signal adjustment circuit, is used for the overspeed protection monitoring after treatment.Call rotating speed abnormal alarm function and input time delay time, reference rotation velocity and enabling signal by input equipment.Single-chip microcomputer flows to delay switch circuit and rotating speed comparison circuit respectively with delay time and reference rotation velocity signal then.Delay switch circuit starts afterwards that the tach signal of autobiography sensor signal adjustment circuit enters the rotating speed comparison circuit, and the rotating speed comparison circuit is noted the fastest tachometer value in the time that delay switch circuit is enabled.After the delay switch circuit timing finishes, send the end signal of delaying time and give single-chip microcomputer, in rotating speed comparison circuit inside the fastest rotating speed that obtains and reference rotation velocity are compared simultaneously, comparative result sends to single-chip microcomputer.If turbine speed is that turbine speed is unusual less than reference rotation velocity at the appointed time, the turbine rotor load is excessive, suffered resistance has exceeded the scope that design is born, steam turbine is installed defective, then the rotating speed comparison circuit sends trip signal and gives single-chip microcomputer, single-chip microcomputer makes an immediate response and exports trip signal, and the unusual indicator light of rotating speed lights, and has detected steam turbine this moment because the improper unusual condition that causes is installed.After trip signal selects the logic determines of two circuit through three, judge under the effective situation of this trip signal and carry out the tripping operation action by the protection executive circuit again, thereby realized rotating speed abnormal alarm function.

TURBINE OVERSPEED PROTECTION DEVICE has three groups of velocity checking circuits, all can select on two circuit further three behind the rotating speed abnormal alarm function on any one group of velocity checking circuits and judge, such can avoiding interference or the influence of transducer misoperation.Can be after TURBINE OVERSPEED PROTECTION DEVICE is installed on the steam turbine by the installation situation of this functional check transducer; whether promptly be used for the detecting sensor installation site correct; because installing incorrect meeting, transducer cause sensor sensing to rotate less than turbine rotor; then will be discovered behind rotating speed abnormal alarm function on, this provides convenience for the installation of TURBINE OVERSPEED PROTECTION DEVICE.

Claims (3)

1. TURBINE OVERSPEED PROTECTION DEVICE; it comprises three groups of velocity checking circuits that work alone; three select two circuit; the protection executive circuit; the output of described velocity checking circuits all selects the input of two circuit to be connected with three; described three select the output of two circuit to be connected with the input of protection executive circuit; described velocity checking circuits comprises single-chip microcomputer at least; sensor signal is adjusted circuit and input equipment; the output that described sensor signal is adjusted circuit is connected with single-chip microcomputer; described input equipment is connected with single-chip microcomputer; it is characterized in that: described velocity checking circuits also comprises rotating speed abnormal alarm circuit; described rotating speed abnormal alarm circuit comprises delay switch circuit and rotating speed comparison circuit; the input of described delay switch circuit is connected with the output that sensor signal is adjusted circuit; the output of described delay switch circuit is connected with the input of rotating speed comparison circuit; the output of described rotating speed comparison circuit is connected with single-chip microcomputer; the control end of described delay switch circuit is connected with single-chip microcomputer, and the control end of described rotating speed comparison circuit is connected with single-chip microcomputer.

2. according to the described TURBINE OVERSPEED PROTECTION DEVICE of claim 1, it is characterized in that: described velocity checking circuits also comprises data display circuit, the unusual indicator light of rotating speed, and described data display circuit, the unusual indicator light of rotating speed all are connected with single-chip microcomputer.

3. according to claim 1 or 2 described TURBINE OVERSPEED PROTECTION DEVICE, it is characterized in that: described velocity checking circuits also comprises external memory, and described external memory is connected with single-chip microcomputer.

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