CN114115109B - Screw air compressor control system for power plant - Google Patents
Screw air compressor control system for power plant Download PDFInfo
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- CN114115109B CN114115109B CN202111423128.5A CN202111423128A CN114115109B CN 114115109 B CN114115109 B CN 114115109B CN 202111423128 A CN202111423128 A CN 202111423128A CN 114115109 B CN114115109 B CN 114115109B
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- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 230000001012 protector Effects 0.000 description 9
- 238000011065 in-situ storage Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
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- 238000001816 cooling Methods 0.000 description 4
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- 230000002159 abnormal effect Effects 0.000 description 2
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- 239000003086 colorant Substances 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
- G05B19/054—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/10—Plc systems
- G05B2219/11—Plc I-O input output
- G05B2219/1103—Special, intelligent I-O processor, also plc can only access via processor
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Abstract
The invention discloses a screw air compressor control system for a power plant, which comprises a high-voltage switch control assembly, a control system and a control system, wherein the high-voltage switch control assembly comprises a high-voltage switch cabinet, a comprehensive protection piece arranged on the high-voltage switch cabinet, an opening and closing brake component connected with the comprehensive protection piece, and an air compressor control cabinet connected with the comprehensive protection piece and the opening and closing brake component; and the screw air compressor control assembly comprises a cabinet body connected with the comprehensive protection piece, a PLC (programmable logic controller) arranged in the cabinet body, a fusing device arranged in the cabinet body and a start-stop instruction input piece arranged in the cabinet body, and has the functions of remote DCS and on-site start and stop, and meanwhile has the functions of remotely monitoring the running state and fault state of the 10kV high-voltage switch and the running state and fault state of the on-site screw air compressor, and meanwhile, the capacity of reliably switching off the 10kV high-voltage switch when the on-site screw air compressor runs abnormally.
Description
Technical Field
The invention relates to the technical field of screw air compressors, in particular to a control system of a screw air compressor for a power plant.
Background
According to the difference of the internal related structures of the air compressors, the air compressors on the market at present are mainly divided into screw air compressors, piston air compressors, centrifugal air compressors and the like. Centrifugal air compressors are mainly used in situations where the air consumption is very high, and generally, enterprises use few. The investment on equipment of the piston type air compressor is low, and a plurality of enterprises adopt the piston type air compressor in the past, but the gas production efficiency is lower, and the piston type air compressor is gradually replaced by a screw type air compressor. The screw air compressor compressed air system of the power plant is a very important public system in a thermal power plant. The reliability and stability of the system operation directly affect the safe operation of the power plant units, and are very important for safe production, so that the safety of the compressed air system, namely the production safety of the whole plant, is ensured to a certain extent.
Disclosure of Invention
This section is intended to outline some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description summary and in the title of the application, to avoid obscuring the purpose of this section, the description summary and the title of the invention, which should not be used to limit the scope of the invention.
The present invention has been made in view of the above-described problems with the conventional control system for a screw air compressor for a power plant.
Accordingly, the invention aims to provide a screw air compressor control system for a power plant.
In order to solve the technical problems, the invention provides the following technical scheme: the screw air compressor control system for the power plant comprises a high-voltage switch control assembly, a control system and a control system, wherein the high-voltage switch control assembly comprises a high-voltage switch cabinet, a comprehensive protection piece arranged on the high-voltage switch cabinet, an opening and closing brake part connected with the comprehensive protection piece, and an air compressor control cabinet connected with the comprehensive protection piece and the opening and closing brake part; and the screw air compressor control assembly comprises a cabinet body connected with the comprehensive protection piece, a PLC (programmable logic controller) arranged in the cabinet body, a fuse element arranged in the cabinet body and a start-stop instruction input piece arranged in the cabinet body.
As a preferable scheme of the control system of the screw air compressor for the power plant, the invention comprises the following steps: the comprehensive protection piece is connected with a high-voltage cabinet control positive power supply air switch and a high-voltage cabinet control negative power supply air switch, a remote/on-site conversion handle is arranged on the high-voltage switch cabinet, and a brake opening/closing handle is arranged on the high-voltage switch cabinet.
As a preferable scheme of the control system of the screw air compressor for the power plant, the invention comprises the following steps: the switching-on and switching-off part comprises a high-voltage switch switching-on coil connected with the comprehensive protection piece and a high-voltage switch switching-off coil arranged on the comprehensive protection piece, the high-voltage switch switching-on coil and the high-voltage switch switching-off coil are arranged in parallel,
the high-voltage switch switching-on coil is provided with a normally-open node, the high-voltage switch switching-off coil is provided with a normally-closed node, the normally-open node and the normally-closed node are connected with the comprehensive protection piece through a cable, and the end part of the cable is connected with the cabinet body.
As a preferable scheme of the control system of the screw air compressor for the power plant, the invention comprises the following steps: the fusing device comprises a first fuse arranged in a cabinet body, a second fuse connected with a PLC controller and a third fuse connected with a control loop in the cabinet body, wherein the cabinet body is connected with a bus PT cabinet through a cable, a fourth fuse connected with three-phase voltage in the bus PT cabinet is arranged in the cabinet body,
the three phase paths of the three-phase voltage of the bus PT cabinet are respectively A630, B603 and C630, and the fourth fuse is provided with three phase paths which are respectively arranged on each phase path.
As a preferable scheme of the control system of the screw air compressor for the power plant, the invention comprises the following steps: the start-stop instruction input part comprises a data receiving unit, a data processing unit connected with the data receiving unit and a start-stop instruction output unit,
the PLC is provided with a display screen, and the display screen is electrically connected with the data processing unit.
As a preferable scheme of the control system of the screw air compressor for the power plant, the invention comprises the following steps: the automatic transformer is arranged in the cabinet body, the first fuse is electrically connected with the automatic transformer, the control circuit stretches out of the automatic transformer, the first fuse comprises a first bearing ring arranged on the control circuit, a bearing cylinder connected with the first bearing ring and a second bearing ring connected with the bearing cylinder, a fuse is arranged in the bearing cylinder, a clamping cylinder is arranged at the lower end of the fuse, and the diameter of the clamping cylinder is smaller than that of the bearing cylinder.
As a preferable scheme of the control system of the screw air compressor for the power plant, the invention comprises the following steps: the clamping cylinder is characterized in that a plurality of protrusions are arranged on the outer side wall of the clamping cylinder, a plurality of grooves matched with the protrusions are formed in the inner wall of the bearing cylinder, and a locking part is arranged on the second bearing ring.
As a preferable scheme of the control system of the screw air compressor for the power plant, the invention comprises the following steps: the locking part comprises a clamping column, a plurality of extending rods arranged on the clamping column and chain wheels rotatably connected to the end parts of each extending rod, a plurality of chains are arranged outside the chain wheels, and each chain wheel is provided with a deflector rod.
As a preferable scheme of the control system of the screw air compressor for the power plant, the invention comprises the following steps: the novel chain is characterized in that an internal thread cylinder is arranged on the clamping column, a thread column is arranged in the middle section of the chain, the thread column is in threaded fit with the internal thread cylinder, an air cylinder is arranged on the clamping column, and a clamping rod is hinged between the air cylinder and the internal thread cylinder.
The invention has the beneficial effects that: the remote DCS and on-site starting and stopping functions are provided, the remote monitoring of the operation state and the fault state of the 10kV high-voltage switch and the on-site screw air compressor are provided, meanwhile, the capacity of reliably switching off the 10kV high-voltage switch when the on-site screw air compressor operates abnormally is provided, the capacity of reliably stopping the on-site screw air compressor due to the failure of the 10kV high-voltage switch can be provided, and the risk of fault expansion caused by incapacity of cutting out due to failure after the abnormal condition of the screw air compressor is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
fig. 1 is a schematic diagram of a high-voltage switch control assembly of a screw air compressor control system for a power plant.
Fig. 2 is a schematic diagram of a connection structure of an air compressor control cabinet of the screw air compressor control system for a power plant.
Fig. 3 is a schematic structural diagram of a control assembly of a screw air compressor in the control system of the screw air compressor for a power plant.
Fig. 4 is a general schematic diagram of the first fuse of the screw air compressor control system for a power plant of the present invention.
Fig. 5 is an exploded schematic view of the internal structure of the first fuse of the control system of the screw air compressor for a power plant of the present invention.
Fig. 6 is a schematic structural diagram of a locking component of the control system of the screw air compressor for the power plant.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Further, in describing the embodiments of the present invention in detail, the cross-sectional view of the device structure is not partially enlarged to a general scale for convenience of description, and the schematic is only an example, which should not limit the scope of protection of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in actual fabrication.
Example 1
Referring to fig. 1 to 3, a screw air compressor control system for a power plant includes a high voltage switch control assembly 100 including a high voltage switch cabinet 101, a comprehensive protector 102 provided on the high voltage switch cabinet 101, an opening and closing brake part 103 connected to the comprehensive protector 102, and an air compressor control cabinet 104 connected to the comprehensive protector 102 and the opening and closing brake part 103; and a screw air compressor control assembly 200, including a cabinet 201 connected with the comprehensive protector 102, a PLC 202 arranged in the cabinet 201, a fuse device 203 arranged in the cabinet 201, and a start-stop command input piece 204 arranged in the cabinet 201, the high-voltage switch cabinet 101 is connected with a high-voltage cabinet control positive power supply air switch 102a and a high-voltage cabinet control negative power supply air switch 102B, the high-voltage switch cabinet 101 is provided with a remote/local conversion handle 105, the high-voltage switch cabinet 101 is provided with a brake-opening/closing handle, the brake-opening component 103 includes a high-voltage switch brake-closing coil 103a connected with the comprehensive protector 102 and a high-voltage switch brake-opening coil 103B arranged on the comprehensive protector 102, the high-voltage switch brake-closing coil 103a is arranged in parallel with the high-voltage switch brake-opening coil 103B, wherein the high-voltage switch brake-closing coil 103a is provided with a normally-open node 107, the high-voltage switch brake-opening coil 103B is provided with a normally-closed node 108, the normally open node 107 and the normally closed node 108 are connected with the comprehensive protection member 102 through cables, the cable end is connected with the cabinet 201, the fuse device 203 comprises a first fuse 203a arranged in the cabinet 201, a second fuse 203B connected with the PLC controller 202 and a third fuse 203C connected with a control loop in the cabinet 201, the cabinet 201 is connected with a bus PT cabinet 205 through cables, a fourth fuse 206 connected with three-phase voltage in the bus PT cabinet 205 is arranged in the cabinet 201, three phase paths of the three-phase voltage of the bus PT cabinet 205 are respectively A630, B603 and C630, the fourth fuse 206 is provided with three, the four fuse is respectively arranged on each phase path, the start-stop command input member 204 comprises a data receiving unit 204a, a data processing unit 204B connected with the data receiving unit 204a and a start-stop command output unit 204C, a display screen 207 is arranged on the PLC controller 202, the display 207 is electrically connected to the data processing unit 204 b.
Specifically, the invention comprises a high-voltage switch control assembly 100 and a screw air compressor control assembly 200, wherein the high-voltage switch control assembly 100 comprises a high-voltage switch cabinet 101, in the embodiment, the high-voltage switch cabinet 101 is a 10kV high-voltage switch cabinet 101, a high-voltage cabinet control positive power supply air switch 102a (QF 1) and a high-voltage cabinet control negative power supply air switch 102b (QF 2) are connected to the high-voltage switch cabinet 101, a remote/local switching handle 105SA1 is arranged on the high-voltage switch cabinet 101, the switching handle 105 can meet the effect of 2 layers of 3 positions, a switching-off/switching-on handle SA2 is arranged on the high-voltage switch cabinet 101, and the handle can meet the effect of 2 layers of 3 positions and can automatically reset.
Further, the high-voltage switch control assembly 100 further includes a comprehensive protection component 102, in this embodiment, the comprehensive protection component 102 is a 10kV high-voltage cabinet PT switch comprehensive protection device, and a mental science and technology WDZ-5200 series comprehensive protection device is used to collect analog quantities and various signal quantities of the 10kV high-voltage switch, so as to implement a high-voltage switch start-stop function; meanwhile, an opening and closing member 103 is electrically connected to the comprehensive protector 102, and in this embodiment, the opening and closing member 103 includes a high-voltage switch-closing coil 103aKA connected to the comprehensive protector 102 and a high-voltage switch-opening coil 103b (KA 2) disposed on the comprehensive protector 102, where the high-voltage switch-closing coil 103aKA and the high-voltage switch-opening coil 103b (KA 2) are disposed in parallel.
Further, the screw air compressor control assembly 200 of the invention comprises a cabinet 201, the cabinet 201 is connected with the comprehensive protection piece 102, in this embodiment, the cabinet 201 is an on-site screw air compressor control cabinet PT104, 301 and 303 paths of a normally open node 107 of a KA4 relay in the on-site screw air compressor control cabinet PT104 are connected to a remote position in a remote/on-site switching handle 105 of a 10kV switch cabinet PT, a remote switching function is realized, and 302 and 319 paths of a normally open node 107 of a KA5 relay in the on-site screw air compressor control cabinet PT are connected to a remote position in the remote/on-site switching handle 105 of the 10kV switch cabinet PT, so that a remote switching function is realized.
The electric secondary circuit wiring is used for realizing the switching-on and switching-off of the 10kV high-voltage switch, and the switching-on method comprises a switching-on switch at a switch test position, a local switching-on switch and a switching-on mode of a remote air compressor control cabinet PT 104; the switching-off method comprises a switching-off switch at a switching-on test position, a local switching-off switch and a switching-off mode of a PT104 of a remote air compressor control cabinet.
Further, three pairs of signals of a KA1 normally open node 107 (11 a-12 b), a KA2 normally closed node 108 (11 a-11 b) and a K01 device fault tripping output node (11 a-13 b) are transmitted into a control cabinet PT104 of the on-site screw air compressor through a 7 x 1.5 cable, the KA1 normally open node 107 (11 a-12 b) is used for displaying a 10kV switch closing state, the KA2 normally closed node 108 (11 a-11 b) is used for displaying a 10kV switch opening state, and the K01 device fault tripping output node (11 a-13 b) is used for stopping a cooling system of the on-site screw air compressor; three-phase voltages A630, B630 and C630 in the 10kV bus PT cabinet 205 are connected into the in-situ screw air compressor control cabinet PT104 through a4 x 1.5 cable, and are used for protecting the high-voltage power supply phase sequence of the in-situ screw air compressor.
Further, the screw air compressor control assembly 200 further includes a fuse device 203 disposed in the cabinet 201, the fuse device 203 includes a first fuse 203a disposed in the cabinet 201, a second fuse 203b connected to the PLC controller 202, and a third fuse 203c connected to a control loop in the cabinet 201, the cabinet 201 is connected to a bus PT cabinet 205 through a cable, and a fourth fuse 206 connected to a three-phase voltage in the bus PT cabinet 205 is disposed in the cabinet 201, as shown in the figure: FU1 and FU2 are wire-inlet power fuses of an autotransformer 300 in a control device of an in-situ screw air compressor, and the phase-to-phase voltage is 380V; the secondary winding of the autotransformer 300 respectively generates 220V alternating current and 24V alternating current, the 220V alternating current is used for controlling a loop power supply in the control cabinet PT104 of the on-site screw air compressor, and the 24V alternating current power supply is used for the power supply of the PLC 202 of the on-site screw air compressor; FU3 is a power fuse of the PLC 202 in the control device of the in-situ screw air compressor; FU4 is a control loop power fuse in the control device of the in-situ screw air compressor; FU5, FU6, FU7 are three-phase voltages a630, B630, C630 fuses from within 10kV bus PT cabinet 205, respectively.
Further, the screw air compressor control assembly 200 further includes a start-stop command input member 204, where the start-stop command input member 204 includes a data receiving unit 204a, a data processing unit 204b connected to the data receiving unit 204a, and a start-stop command output unit 204c, where the data processing unit 204b includes a plurality of input units, and DI01 is an in-situ screw air compressor control device scram command input; DI02 is DCS remote start/stop command input; DI04 phase sequence protection input; DI05 is the high-voltage fault signal input of the 10kV high-voltage switch cabinet 101; DI06 is fan motor overload signal input; DI07 is 10kV high voltage switchgear 101 feedback.
Further, the control assembly 200 of the screw air compressor further comprises a PLC controller 202, wherein the PLC controller 202 is provided with a 485 communication interface, and is connected with a PLC display screen 207 to display real-time data.
The operation process comprises the following steps: the starting process of the screw air compressor comprises the following steps:
DCS sends out long pulse signal to PLC's DI02 point remotely, and after the PLC received the start signal, K01 node closure start KM1 in the PLC controller 202, start screw air compressor machine cooling blower behind the contactor actuation, and K02 node closure start KA4 relay in the PLC controller 202 simultaneously, and the remote switch-on 10kV high voltage switch, screw air compressor machine motor is the electric operation this moment. After the DCS remotely stops sending the pulse signal, after the PLC receives the stop signal, a K03 node in the PLC controller 202 is closed to start a KA5 relay, a 10kV high-voltage switch is remotely opened, a K01 node returns, and a KM1 contactor returns to stop a cooling fan of the screw air compressor.
In the process, the DCS can remotely see the running states of the screw air compressor and the 10kV high-voltage switch.
Emergency stop: and the operator operates the PLC, the KM1 contactor is in power failure return, the KA4 relay is in power failure return, and the 10kV high-voltage switch is stopped.
The cooling fan is overloaded: and the PLC outputs a brake-separating instruction, the K03 node is closed to start the KA5 relay, and the brake is remotely separated from the 10kV high-voltage switch.
High-voltage board PT trouble: after the PT switch of the 10kV high-voltage cabinet fails, the nodes 11a-13b of the 10kV comprehensive protection device are closed, normally closed contacts are started, a switching-off instruction is output after the PLC acquires signals, the K03 node is closed to start a KA5 relay, and the 10kV high-voltage switch is remotely switched off.
The system can not only achieve the purpose of starting the screw air compressor by the remote DCS, but also monitor the running state of the 10kV high-voltage switch and the running state of the on-site screw air compressor remotely, and when any equipment has serious faults, the system can disconnect other equipment at the first time, so that the risk of further expanding accidents caused by abnormal running of the equipment due to the fact that monitoring disc personnel cannot monitor the equipment in place is reduced.
Example 2
Referring to fig. 4-6, this embodiment differs from the first embodiment in that: an autotransformer 300 is disposed in the cabinet 201, the first fuse 203a is electrically connected with the autotransformer 300, a control circuit 301 extends out of the autotransformer 300, the control circuit 301 includes two wires for interfacing the positive and negative electrodes of the autotransformer 300, and the first fuse 203a is disposed on each wire.
Further, in the present embodiment, the first fuse 203a includes a first receiving ring 302 provided on the control circuit 301, the first receiving ring 302 is hemispherical in shape, a receiving cylinder 303 is connected to the first receiving ring 302, the receiving cylinder 303 is cylindrical in shape, the interior is hollow, a second receiving ring 304 is also connected to the other end of the receiving cylinder 303, a fuse 305 is provided in the receiving cylinder 303, the fuse 305 is connected to an electric wire, and the exterior is covered with a conductive material.
Further, a clamping cylinder 306 is arranged at the lower end of the fuse wire 305, the diameter of the clamping cylinder 306 is smaller than that of the receiving cylinder 303, a plurality of protrusions are arranged on the outer side wall of the clamping cylinder 306, a plurality of grooves matched with the protrusions are formed on the inner wall of the receiving cylinder 303, and a locking part 400 is arranged on the second receiving ring 304.
Further, in this embodiment, the locking member 400 includes a clamping post, the clamping post extends upward from a middle section of the second receiving ring 304, a plurality of extending rods 402 are further disposed on the clamping post, the extending rods 402 extend outward from a radial direction of the clamping post, in this embodiment, the number of the extending rods 402 is 3, a sprocket 403 extends outward from an end portion of each extending rod 402, a rotation plane of the sprocket 403 is a horizontal plane, a chain 404 is mounted outside the three sprockets 403, movement of the chain 404 can drive the three sprockets 403 to rotate simultaneously, meanwhile, a deflector rod 405 is disposed on each sprocket 403, an internal thread cylinder 406 is disposed on the clamping post, a threaded post 407 is disposed on a middle section of the chain 404, the threaded post 407 is in threaded fit with the internal thread cylinder 406, a cylinder 408 is disposed on the clamping post, and a clamping rod 409 is hinged between the cylinder 408 and the internal thread cylinder 406.
The rest of the structure is the same as in embodiment 1.
The operation process comprises the following steps: through the movement of the air cylinder 408, the internal thread cylinder 406 is driven to rotate, so that the thread post 407 rotates, then the chain 404 is driven to move, the extension rod 402 is outwards screwed out, the clamping cylinder 306 is driven to move after the extension rod is screwed out, and the protrusion and the groove on the outer side of the clamping cylinder 306 are matched, so that locking is realized.
It is important to note that the construction and arrangement of the present application as shown in a variety of different exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperature, pressure, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter described in this application. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of present invention. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present inventions. Therefore, the invention is not limited to the specific embodiments, but extends to various modifications that nevertheless fall within the scope of the appended claims.
Furthermore, in an effort to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those not associated with the best mode presently contemplated for carrying out the invention, or those not associated with practicing the invention).
It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure.
It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered in the scope of the claims of the present invention.
Claims (2)
1. A screw air compressor control system for power plant, its characterized in that: comprising the steps of (a) a step of,
the high-voltage switch control assembly (100) comprises a high-voltage switch cabinet (101), a comprehensive protection piece (102) arranged on the high-voltage switch cabinet (101), an opening and closing brake component (103) connected with the comprehensive protection piece (102) and an air compressor control cabinet PT (104) connected with the comprehensive protection piece (102) and the opening and closing brake component (103); the method comprises the steps of,
the screw air compressor control assembly (200) comprises a cabinet body (201) connected with the comprehensive protection piece (102), a PLC (programmable logic controller) (202) arranged in the cabinet body (201), a fusing device (203) arranged in the cabinet body (201) and a start-stop instruction input piece (204) arranged in the cabinet body (201);
the comprehensive protection piece (102) is connected with a high-voltage cabinet control positive power supply air switch (102 a) and a high-voltage cabinet control negative power supply air switch (102 b), a remote/on-site conversion handle (105) is arranged on the high-voltage switch cabinet (101), and a brake opening/closing handle is arranged on the high-voltage switch cabinet (101);
the switching-on/off part (103) comprises a high-voltage switch switching-on coil (103 a) connected with the comprehensive protection piece (102) and a high-voltage switch switching-off coil (103 b) arranged on the comprehensive protection piece (102), the high-voltage switch switching-on coil (103 a) and the high-voltage switch switching-off coil (103 b) are arranged in parallel,
the high-voltage switch closing coil (103 a) is provided with a normally open node (107), the high-voltage switch opening coil (103 b) is provided with a normally closed node (108), the normally open node (107) is connected with the normally closed node (108) and the comprehensive protection piece (102) through a cable, and the end part of the cable is connected with the cabinet body (201);
the normally open node (107) of the high-voltage switch closing coil (103 a) is used for displaying the closing state of the high-voltage switch cabinet (101), the normally closed node (108) of the high-voltage switch opening coil (103 b) is used for displaying the opening state of the high-voltage switch cabinet (101),
the DCS remotely sends out long pulse signals, the PLC (202) starts a KA4 relay to remotely switch on, and after the DCS remotely stops sending out the pulse signals, the PLC (202) starts a KA5 relay to remotely switch off;
the normally open node of the KA4 relay in the on-site screw air compressor control cabinet PT (104) is connected to the remote position in the remote/on-site switching handle (105), so that a remote switching-on function is realized, and the normally open node of the KA5 relay in the on-site screw air compressor control cabinet PT (104) is connected to the remote position in the remote/on-site switching handle (105), so that a remote switching-off function is realized;
the fusing device (203) comprises a first fuse (203 a) arranged in a cabinet body (201), a second fuse (203 b) connected with a PLC (programmable logic controller) 202 and a third fuse (203 c) connected with a control loop in the cabinet body (201), wherein the cabinet body (201) is connected with a bus PT cabinet (205) through a cable, a fourth fuse (206) connected with three-phase voltage in the bus PT cabinet (205) is arranged in the cabinet body (201),
three phase paths of the three-phase voltage of the bus PT cabinet (205) are respectively A630, B603 and C630, and the fourth fuse (206) is provided with three phase paths which are respectively arranged on each phase path;
the automatic control device is characterized in that an autotransformer (300) is arranged in the cabinet body (201), the first fuse (203 a) is electrically connected with the autotransformer (300), a control circuit (301) extends out of the autotransformer (300), the first fuse (203 a) comprises a first bearing ring (302) arranged on the control circuit (301), a bearing cylinder (303) connected with the first bearing ring (302) and a second bearing ring (304) connected with the bearing cylinder (303), a fuse wire (305) is arranged in the bearing cylinder (303), a clamping cylinder (306) is arranged at the lower end of the fuse wire (305), and the diameter of the clamping cylinder (306) is smaller than that of the bearing cylinder (303);
a plurality of bulges are arranged on the outer side wall of the clamping cylinder (306), a plurality of grooves matched with the bulges are formed in the inner wall of the bearing cylinder (303), and a locking part (400) is arranged on the second bearing ring (304);
the locking component (400) comprises a clamping column, a plurality of protruding rods (402) arranged on the clamping column and chain wheels (403) rotatably connected to the end parts of the protruding rods (402), a chain (404) is arranged outside the plurality of chain wheels (403), and a deflector rod (405) is arranged on each chain wheel (403);
the novel chain is characterized in that an internal thread cylinder (406) is arranged on the clamping column, a thread column (407) is arranged in the middle section of the chain (404), the thread column (407) is in threaded fit with the internal thread cylinder (406), an air cylinder (408) is arranged on the clamping column, and a clamping rod (409) is hinged between the air cylinder (408) and the internal thread cylinder (406).
2. The screw air compressor control system for a power plant of claim 1, wherein: the start-stop instruction input part (204) comprises a data receiving unit (204 a), a data processing unit (204 b) connected with the data receiving unit (204 a) and a start-stop instruction output unit (204 c),
the PLC (202) is provided with a display screen (207), and the display screen (207) is electrically connected with the data processing unit (204 b).
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