CN214900691U - Improved starting circuit of air compressor unit - Google Patents
Improved starting circuit of air compressor unit Download PDFInfo
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- CN214900691U CN214900691U CN202120803319.3U CN202120803319U CN214900691U CN 214900691 U CN214900691 U CN 214900691U CN 202120803319 U CN202120803319 U CN 202120803319U CN 214900691 U CN214900691 U CN 214900691U
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Abstract
The utility model relates to a water resistance starts starting circuit between cabinet and the main motor of air compressor unit, specifically is a modified air compressor unit starting circuit, has solved the technical problem in the background art, and it is connected to between main motor and the water resistance starting cabinet including newly-increased circuit breaker, newly-increased circuit breaker divide-shut brake control circuit and improvement back main circuit breaker combined floodgate control circuit still including newly-increased circuit breaker PLC control circuit, newly-increased circuit breaker. After the transformation, the air compressor unit starts normally, after the starting is finished, the newly added circuit breaker automatically opens according to set time, the water resistance starting cabinet is completely cut off from the system, the air compressor unit still operates normally, and the influence of water leakage of the water resistance starting cabinet on the normal operation of the air compressor unit is completely avoided.
Description
Technical Field
The utility model relates to a water resistance starts starting circuit between cabinet and the main motor of air compressor unit, specifically is a modified air compressor unit starting circuit.
Background
The 3800KW air compressor set is started by adopting a simple water resistance starting cabinet to reduce the pressure. The primary system wiring principle sketch of the air compressor unit is shown in figure 1, a main motor M in the drawing is connected to a 10K bus through a main circuit breaker DL1, the output end of the main motor M is connected to a load through a star point circuit breaker DL2, the main motor M is directly connected with a water resistance starting and sending cabinet, the water resistance starting cabinet is controlled by a PLC (programmable logic controller), only opening and closing state signals of the main circuit breaker DL1 and the star point circuit breaker DL2 are collected as a criterion, the PLC judges whether the starting of the main motor M is completed or not in a time control mode, the star point circuit breaker DL2 is closed in a delayed mode, and the process switching from the voltage reduction starting of the main motor M to the full voltage operation is completed. However, when the water resistance starting cabinet leaks water, the differential protection action of the running air compressor unit trips, and the air compressor unit is not shut down on schedule, so that great influence is caused on production.
Disclosure of Invention
The utility model discloses when aiming at solving when water resistance starting cabinet fault phenomena such as appear leaking, can lead to the technical problem of air compressor unit tripping operation, outage, provide a modified air compressor unit starting circuit.
The utility model provides a technical means that its technical problem adopted is: an improved starting circuit of an air compressor unit comprises a newly-added circuit breaker DL3, a newly-added circuit breaker DL3, a PLC control circuit of the newly-added circuit breaker, an opening and closing control circuit of the newly-added circuit breaker and a closing control circuit of an improved main circuit breaker, wherein the newly-added circuit breaker DL3 is connected between a main motor M and a water resistance starting cabinet;
the PLC control loop of the newly added breaker comprises a PLC controller, a first intermediate relay K1, a second intermediate relay K2, a star-breaking intermediate relay KA1 and a main-breaking intermediate relay KA2, wherein the PLC controller is connected to a 220V alternating current power supply through a first air switch QF1, the PLC controller converts 220V alternating current into 24V direct current through a 24V direct current power supply module in the PLC controller and outputs the 24V direct current, one end of a normally closed contact of the star-breaking intermediate relay KA1 is connected to a star point breaker on-position signal input end of the PLC controller, one end of a normally closed contact of the main-breaking intermediate relay KA2 is connected to a main breaker on-position signal input end of the PLC controller, one end of a normally closed auxiliary contact of the newly added breaker DL3 is connected to an on-position signal input end of the PLC controller, the other end of a normally closed contact of the star-breaking intermediate relay KA1, the other end of the normally closed contact of the main-breaking intermediate relay KA2 and the normally open auxiliary contact of the newly added breaker DL3 are connected in parallel and then connected to a 24V direct current output end of the PLC controller, one end of a coil of a first intermediate relay K1 is connected to an output end of a PLC controller for controlling opening and closing of a newly-added breaker DL3, one end of a coil of a second intermediate relay K2 is connected to an output end of the PLC controller for controlling closing of the newly-added breaker DL3, the other end of the coil of the first intermediate relay K1 and the other end of the coil of the second intermediate relay K2 are respectively connected to a zero line N of a 220V alternating-current power supply, and an output COM end of the PLC controller is connected to a live line L of the 220V alternating-current power supply;
the newly-added breaker opening and closing control loop comprises a newly-added breaker opening control loop, a newly-added breaker closing indication loop, a newly-added breaker opening indication loop and a star point breaker opening contact expansion loop which are connected in parallel, the newly-added breaker opening control loop comprises a first intermediate relay K1 normally open contact, a newly-added breaker DL3 normally open auxiliary contact and a newly-added breaker opening coil TQDL3 which are connected in series, the newly-added breaker closing control loop comprises a second intermediate relay K2 normally open contact, a newly-added breaker DL3 normally closed auxiliary contact and a newly-added breaker closing coil HQDL3 which are connected in series, the newly-added breaker closing indication loop comprises a newly-added breaker DL3 normally open auxiliary contact and a first indicator lamp D1 which are connected in series, the newly-added breaker opening indication loop comprises a newly-added breaker DL3 normally closed auxiliary contact and a newly-added breaker closing indicator lamp D2 which are connected in series, the star point circuit breaker position contact expansion loop comprises a normally closed auxiliary contact of a star point circuit breaker DL2 and a coil of a star point intermediate relay KA1 which are connected in series; the switching-on and switching-off control circuit of the newly-added circuit breaker is connected to the power supply circuit through a second air switch QF 2;
the improved main circuit breaker switching-on control loop comprises a main circuit breaker switching-on control loop and a main circuit breaker separating contact expansion loop which are connected in parallel, wherein the main circuit breaker switching-on control loop comprises a main circuit breaker switching-on coil HQDL1, a newly-added circuit breaker DL3 normally-open auxiliary contact, a star-cut intermediate relay KA1 normally-open contact and an original control loop of a main circuit breaker DL1 which are connected in series, and the main circuit breaker separating contact expansion loop comprises a main circuit breaker DL1 normally-closed auxiliary contact and a main-cut intermediate relay KA2 coil which are connected in series; the modified main breaker closing control circuit is connected to a power supply circuit through a third air switch QF 3.
The utility model discloses a theory of operation is:
when the air compressor unit does not need to continue to operate, the main breaker DL1 is controlled to be opened manually, and the PLC in the raw water resistance starting cabinet controls the star point breaker DL2 to be opened through the control loop. After the main breaker DL1 is switched off, the normally closed auxiliary contact of the main breaker DL1 in the main breaker open contact expansion loop is recovered to be in a closed state, the main breaker open contact expansion loop is powered on, the coil of the main breaking intermediate relay KA2 is electrified, the normally closed contact of the main breaking intermediate relay KA2 is opened, the signal input end of the main breaker close signal cannot receive a signal, and the newly-added breaker DL3PLC judges that the main breaker DL1 is in a switched-off state. After the star point circuit breaker DL2 is switched off, the normally closed auxiliary contact of the star point circuit breaker DL2 in the star point circuit breaker open position contact expansion loop restores to the closed state, at the moment, the star point circuit breaker open position contact expansion loop is connected with a power supply, a coil of the star break intermediate relay KA1 is electrified, the normally closed contact of the star break intermediate relay KA1 is opened, at the moment, the star point circuit breaker open position signal input end cannot receive a signal, and the newly-added circuit breaker DL3PLC judges that the star point circuit breaker DL2 is in the open state. The main circuit breaker closes a position signal input, star point circuit breaker closes a position signal input and can not receive the back at the signal, newly-increased circuit breaker DL3PLC controller judges that the air compressor unit is in the shutdown state, 3 seconds (the time can be set for according to actual need) back delays, newly-increased circuit breaker DL3PLC controller passes through control circuit control second auxiliary relay K2 coil and gets electricity, second auxiliary relay K2 normally open contact is closed, newly-increased circuit breaker combined floodgate control circuit switch-on power supply, newly-increased circuit breaker DL 3's combined floodgate coil gets electricity, newly-increased circuit breaker DL3 combined floodgate, it prepares for next air compressor unit to start. After the newly-added breaker DL3 is switched on, the normally-open auxiliary contact is closed, and the normally-closed auxiliary contact is opened. At the moment, normally open auxiliary contacts of the newly added breaker DL3 in the newly added breaker opening control circuit, the newly added breaker closing indication circuit and the main breaker closing control circuit are all closed, the newly added breaker closing indication circuit is connected, and the first indicator lamp D1 is turned on.
When the air compressor unit needs to operate, the main circuit breaker DL1 is manually controlled to be switched on, at the moment, the newly-added circuit breaker DL3 is in a switched-on state, the water resistance starting cabinet starts to work, the main motor M is started in a voltage reduction mode, and after starting is completed, the PLC in the raw water resistance starting cabinet controls the star point circuit breaker DL2 to be switched on through the control loop. After the main circuit breaker DL1 is switched on, the normally closed auxiliary contact of the main circuit breaker DL1 is disconnected, the branch contact expansion loop of the main circuit breaker is disconnected, the coil of the main breaking intermediate relay KA2 is disconnected at the moment, and the normally closed contact of the main breaking intermediate relay KA2 is closed. At the moment, the on-position signal input end of the main breaker receives a signal, and after the newly-added breaker DL3PLC receives the signal, the main breaker DL1 is judged to be in an on-state. After the star point circuit breaker DL2 is switched on, the normally closed auxiliary contact of the star point circuit breaker DL2 is disconnected, the branch contact expansion loop of the star point circuit breaker is disconnected, at the moment, the coil of the star point intermediate relay KA1 is disconnected, and the normally closed contact of the star point intermediate relay KA1 is closed. At the moment, the star point circuit breaker closing signal input end receives a signal, and after the newly-added circuit breaker DL3PLC receives the signal, the star point circuit breaker DL2 is judged to be in a closing state. After 3 seconds of time delay (time can be set for according to actual need), newly-increased circuit breaker DL3PLC controller passes through control circuit control first auxiliary relay K1 coil and gets electric, first auxiliary relay K1 normally open contact is closed, newly-increased circuit breaker DL3 tripping operation control circuit switch-on, newly-increased circuit breaker DL 3's tripping coil gets electric, newly-increased circuit breaker DL3 separating brake, thoroughly amputate water resistance starting cabinet from the system, even fault conditions such as water leakage appear in the water tank, can not influence the normal operating of air compressor unit yet. After the newly-increased circuit breaker DL3 is switched off, the normally-closed auxiliary contact is recovered to be closed, the switching-off indicating loop of the newly-increased circuit breaker is switched on, and the second indicating lamp D2 is turned on.
In order to prevent the air compressor unit from being started when the newly-added circuit breaker DL3 is in a brake-off state, when the star point circuit breaker DL2 is closed after the set starting process of the water resistance starting cabinet is finished, the extreme condition of full-voltage starting occurs, and accidental impact is caused to a power supply system, and even the power supply system is in failure. Therefore, after the normally open auxiliary contact of the newly-added breaker DL3 and the normally open contact of the star breaking intermediate relay KA1 are connected in series, the normally open auxiliary contacts and the normally open contact are connected into a closing control loop of the main breaker of the air compressor set in series, and the extreme condition is avoided through hard wiring interlocking.
Star point circuit breaker branch contact extension loop
Preferably, in the newly-increased circuit breaker PLC control circuit, still include third auxiliary relay K3 and audible-visual annunciator BJQ, the one end of third auxiliary relay K3 coil is connected to newly-increased circuit breaker DL3 of PLC controller and refuses the alarm control output, the other end of third auxiliary relay K3 coil is connected to 220V alternating current power supply's zero line N, parallelly connected to between 220V alternating current power supply's zero line N and the live wire L behind audible-visual annunciator BJQ and the series connection of third auxiliary relay K3 normally open contact, audible-visual annunciator BJQ's reset button one end is connected to the alarm reset signal input of PLC controller, audible-visual annunciator BJQ's reset button other end is connected to the 24V direct current output of PLC controller. The newly-added circuit breaker DL3PLC controller's newly-added circuit breaker closes the action condition of position signal input end through the normally open auxiliary contact of newly-added circuit breaker DL3, judge whether the condition of refusing appears in newly-added circuit breaker DL3, when the condition of refusing appears, the PLC controller automatically cuts off newly-added circuit breaker DL3 separating brake or closing signal through control program time delay 1 second (time can be set for according to actual need), PLC controller control third intermediate relay K3 is electrified simultaneously, the normally open contact of third intermediate relay K3 is closed, audible-visual annunciator BJQ circular telegram, audible-visual annunciator BJQ sends alarm signal, indicate staff newly-added circuit breaker DL3 to appear the trouble, in time need to maintain.
Preferably, the output end of the PLC controller for controlling the opening of the newly added breaker DL3 is formed by connecting two output ports in parallel. The design is equivalent to a redundant design, two points of output are achieved, and reliability is guaranteed.
Preferably, the output end of the PLC controller for controlling the closing of the newly added breaker DL3 is formed by connecting two other output ports in parallel. The design is equivalent to a redundant design, two points of output are achieved, and reliability is guaranteed.
The utility model has the advantages that: after the transformation, the starting of the air compressor unit is normal, after the starting is finished, the newly added breaker DL3 is automatically switched off according to set time, the water resistance starting cabinet is completely cut off from the system, the air compressor unit still normally operates, and the influence of water leakage of the water resistance starting cabinet on the normal operation of the air compressor unit is completely avoided.
Drawings
Fig. 1 is a schematic diagram of a primary system wiring principle of an air compressor unit before modification in the background art.
Fig. 2 is the air compressor machine group primary system wiring principle sketch after the transformation.
Fig. 3 is the utility model discloses newly-increased circuit breaker PLC control circuit's wiring principle sketch.
Fig. 4 is the utility model discloses newly-increased circuit breaker divide-shut brake control circuit's wiring principle sketch.
Fig. 5 is the improvement back main circuit breaker combined floodgate control circuit's wiring principle sketch.
Fig. 6 is the utility model discloses a newly-increased circuit breaker PLC control program diagram.
In the figure: m-a main motor; DL 1-main breaker; DL 2-star breaker; DL 3-new breaker; k1 — first intermediate relay; k2 — second intermediate relay; k3 — third intermediate relay; KA 1-star breaking intermediate relay; KA 2-main off intermediate relay; TQDL 3-newly-added breaker opening coil; HQDL 3-newly-increased breaker closing coil; QF 3-main breaker closing coil; QF 1-first air switch; QF 2-second air switch; QF 3-third air switch; BJQ-audible and visual alarm; d1 — first indicator light; d2-second indicator light; an N-zero line; an L-fire line.
Detailed Description
An improved air compressor package starting circuit according to the present invention is described in detail with reference to fig. 1-6.
An improved starting circuit of an air compressor unit, as shown in fig. 2, comprises a newly-added circuit breaker DL3, a newly-added circuit breaker DL3, a PLC control circuit of the newly-added circuit breaker, a switching-on and switching-off control circuit of the newly-added circuit breaker and a switching-on control circuit of an improved main circuit breaker, wherein the newly-added circuit breaker DL3 is connected between a main motor M and a water resistance starting cabinet, and is specifically shown in fig. 3, 4 and 5;
as shown in fig. 3, the PLC control circuit of the newly added breaker includes a PLC controller, a first intermediate relay K1, a second intermediate relay K2, a star-off intermediate relay KA1 and a main-off intermediate relay KA2, the PLC controller is connected to a 220V ac power supply through a first air switch QF1, the PLC controller converts a 220V ac power supply into a 24V dc power supply through its internal 24V dc power supply, one end of a normally closed contact of the star-off intermediate relay KA1 is connected to a star point breaker on signal input end of the PLC controller, one end of a normally closed contact of the main-off intermediate relay KA2 is connected to a main breaker on signal input end of the PLC controller, one end of a normally open auxiliary contact of the newly added breaker DL3 is connected to a newly added breaker on signal input end of the PLC controller, the other end of a normally closed contact of the star-off intermediate relay KA1, the other end of the normally closed contact of the main-off intermediate relay KA2 and the normally open auxiliary contact of the breaker DL3 are connected in parallel and then connected to a 24V dc output end of the PLC controller One end of a coil of a first intermediate relay K1 is connected to an output end of a PLC controller for controlling opening and closing of a newly-added breaker DL3, one end of a coil of a second intermediate relay K2 is connected to an output end of the PLC controller for controlling closing of the newly-added breaker DL3, the other end of the coil of the first intermediate relay K1 and the other end of the coil of the second intermediate relay K2 are respectively connected to a zero line N of a 220V alternating-current power supply, and an output COM end of the PLC controller is connected to a live line L of the 220V alternating-current power supply;
as shown in fig. 4, the newly added breaker opening and closing control circuit comprises a newly added breaker opening and closing control circuit, a newly added breaker closing indication circuit, a newly added breaker opening and closing indication circuit and a star point breaker open contact expansion circuit which are connected in parallel, the newly added breaker opening and closing control circuit comprises a first intermediate relay K1 normally open contact, a newly added breaker DL3 normally open auxiliary contact and a newly added breaker opening coil TQDL3 which are connected in series, the newly added breaker closing control circuit comprises a second intermediate relay K2 normally open contact, a newly added breaker DL3 normally closed auxiliary contact and a newly added breaker closing coil HQDL3 which are connected in series, the newly added breaker closing indication circuit comprises a newly added breaker DL3 normally open auxiliary contact and a first indicator lamp D1 which are connected in series, the newly added breaker opening and closing indication circuit comprises a breaker DL3 normally closed auxiliary contact and a second indicator lamp D2 which are connected in series, the star point circuit breaker position contact expansion loop comprises a normally closed auxiliary contact of a star point circuit breaker DL2 and a coil of a star point intermediate relay KA1 which are connected in series; the switching-on and switching-off control circuit of the newly-added circuit breaker is connected to the power supply circuit through a second air switch QF 2;
as shown in fig. 5, the improved main breaker closing control loop comprises a main breaker closing control loop and a main breaker open contact expansion loop which are connected in parallel, the main breaker closing control loop comprises a main breaker closing coil HQDL1, a newly-added breaker DL3 normally-open auxiliary contact, a star-cut intermediate relay KA1 normally-open contact and an original control loop of a main breaker DL1 which are connected in series, and the main breaker open contact expansion loop comprises a main breaker DL1 normally-closed auxiliary contact and a main-cut intermediate relay KA2 coil which are connected in series; the modified main breaker closing control circuit is connected to a power supply circuit through a third air switch QF 3.
Referring to fig. 1-6, the working principle of the present invention is as follows:
when the air compressor unit does not need to continue to operate, the main breaker DL1 is controlled to be opened manually, and the PLC in the raw water resistance starting cabinet controls the star point breaker DL2 to be opened through the control loop. After the main breaker DL1 is switched off, the normally closed auxiliary contact of the main breaker DL1 in the main breaker open contact expansion loop is recovered to be in a closed state, the main breaker open contact expansion loop is powered on, the coil of the main breaking intermediate relay KA2 is electrified, the normally closed contact of the main breaking intermediate relay KA2 is opened, the signal input end of the main breaker close signal cannot receive a signal, and the newly-added breaker DL3PLC judges that the main breaker DL1 is in a switched-off state. After the star point circuit breaker DL2 is switched off, the normally closed auxiliary contact of the star point circuit breaker DL2 in the star point circuit breaker open position contact expansion loop restores to the closed state, at the moment, the star point circuit breaker open position contact expansion loop is connected with a power supply, a coil of the star break intermediate relay KA1 is electrified, the normally closed contact of the star break intermediate relay KA1 is opened, at the moment, the star point circuit breaker open position signal input end cannot receive a signal, and the newly-added circuit breaker DL3PLC judges that the star point circuit breaker DL2 is in the open state. The main circuit breaker closes a position signal input, star point circuit breaker closes a position signal input and can not receive the back at the signal, newly-increased circuit breaker DL3PLC controller judges that the air compressor unit is in the shutdown state, 3 seconds (the time can be set for according to actual need) back delays, see figure 6, newly-increased circuit breaker DL3PLC controller passes through control circuit control second auxiliary relay K2 coil and gets electricity, second auxiliary relay K2 normally open contact is closed, newly-increased circuit breaker combined floodgate control circuit switch-on power supply, newly-increased circuit breaker DL 3's combined floodgate coil gets electricity, newly-increased circuit breaker DL3 closes a floodgate, it prepares for next air compressor unit to start. After the newly-added breaker DL3 is switched on, the normally-open auxiliary contact is closed, and the normally-closed auxiliary contact is opened. At the moment, normally open auxiliary contacts of the newly added breaker DL3 in the newly added breaker opening control circuit, the newly added breaker closing indication circuit and the main breaker closing control circuit are all closed, the newly added breaker closing indication circuit is connected, and the first indicator lamp D1 is turned on.
When the air compressor unit needs to operate, the main circuit breaker DL1 is manually controlled to be switched on, at the moment, the newly-added circuit breaker DL3 is in a switched-on state, the water resistance starting cabinet starts to work, the main motor M is started in a voltage reduction mode, and after starting is completed, the PLC in the raw water resistance starting cabinet controls the star point circuit breaker DL2 to be switched on through the control loop. After the main circuit breaker DL1 is switched on, the normally closed auxiliary contact of the main circuit breaker DL1 is disconnected, the branch contact expansion loop of the main circuit breaker is disconnected, the coil of the main breaking intermediate relay KA2 is disconnected at the moment, and the normally closed contact of the main breaking intermediate relay KA2 is closed. At the moment, the on-position signal input end of the main breaker receives a signal, and after the newly-added breaker DL3PLC receives the signal, the main breaker DL1 is judged to be in an on-state. After the star point circuit breaker DL2 is switched on, the normally closed auxiliary contact of the star point circuit breaker DL2 is disconnected, the branch contact expansion loop of the star point circuit breaker is disconnected, at the moment, the coil of the star point intermediate relay KA1 is disconnected, and the normally closed contact of the star point intermediate relay KA1 is closed. At the moment, the star point circuit breaker closing signal input end receives a signal, and after the newly-added circuit breaker DL3PLC receives the signal, the star point circuit breaker DL2 is judged to be in a closing state. After 3 seconds of time delay (time can be set according to actual need), see fig. 6, newly-increased circuit breaker DL3PLC controller passes through control circuit control first auxiliary relay K1 coil and gets electric, first auxiliary relay K1 normally open contact is closed, newly-increased circuit breaker DL3 tripping operation control circuit switch-on, newly-increased circuit breaker DL 3's tripping coil gets electric, newly-increased circuit breaker DL3 separating brake, thoroughly amputate water resistance starting cabinet from the system, even fault conditions such as water leakage appear in the water tank, can not influence the normal operating of air compressor unit yet. After the newly-increased circuit breaker DL3 is switched off, the normally-closed auxiliary contact is recovered to be closed, the switching-off indicating loop of the newly-increased circuit breaker is switched on, and the second indicating lamp D2 is turned on.
In order to prevent the air compressor unit from being started when the newly-added circuit breaker DL3 is in a brake-off state, as shown in FIG. 6, when the star point circuit breaker DL2 is closed after the set starting process of the water resistance starting cabinet is finished, an extreme condition of full-voltage starting occurs, and accidental impact is caused to a power supply system or even a power supply system fault is caused. Therefore, after the normally open auxiliary contact of the newly-added breaker DL3 and the normally open contact of the star breaking intermediate relay KA1 are connected in series, the normally open auxiliary contacts and the normally open contact are connected into a closing control loop of the main breaker of the air compressor set in series, and the extreme condition is avoided through hard wiring interlocking.
Further, as a specific implementation mode of a modified air compressor set starting circuit, among the newly-increased circuit breaker PLC control circuit, still include third auxiliary relay K3 and audible-visual annunciator BJQ, the one end of third auxiliary relay K3 coil is connected to the newly-increased circuit breaker DL3 of PLC controller and refuses the alarm control output, the other end of third auxiliary relay K3 coil is connected to 220V AC power supply's zero line N, parallelly connected to between 220V AC power supply's zero line N and the live wire L behind audible-visual annunciator BJQ and the series connection of third auxiliary relay K3 normally open contact, audible-visual annunciator BJQ's reset button one end is connected to the alarm reset signal output of PLC controller, audible-visual annunciator BJQ's reset button other end is connected to the 24V DC output of PLC controller. The action condition of a newly-added breaker closing signal input end of a newly-added breaker DL3PLC controller through a normally-open auxiliary contact of the newly-added breaker DL3 is judged whether the newly-added breaker DL3 has a refusal condition or not, when the refusal condition occurs, the PLC controller can automatically cut off a brake opening signal or a switch closing signal of the newly-added breaker DL3 through control program delay for 1 second (time can be set according to actual requirements), meanwhile, the PLC controller controls a third intermediate relay K3 to be powered on, the normally-open contact of the third intermediate relay K3 is closed, an audible and visual alarm BJQ is powered on, and then the audible and visual alarm BJQ sends an alarm signal to prompt a worker that the newly-added breaker DL3 has a fault and needs to be maintained in time.
Further, as a specific implementation of an improved air compressor set starting circuit, the output that PLC controller controlled newly-increased circuit breaker DL3 separating brake is formed by two output ports parallelly connected. The design is equivalent to a redundant design, two points of output are achieved, and reliability is guaranteed. As shown in detail in fig. 3.
Further, as a specific implementation of an improved air compressor set starting circuit, the output that newly-increased circuit breaker DL3 combined floodgate is connected in parallel by two other output ports to form to the PLC controller control. This corresponds to a redundant design, with two outputs, ensuring reliability, as shown in fig. 3.
Further, as a specific embodiment of the improved starting circuit of the air compressor set of the present invention, the first indicator light D1 and the second indicator light D2 have different colors. The first indicator light D1 is red, and the second indicator light D2 is green; the newly added breaker DL3 is a vacuum breaker. The first indicator light D1 and the second indicator light D2 are different in color, so that the opening and closing conditions of the newly-added circuit breaker DL3 can be distinguished directly and clearly through the color of the indicator lights.
The above detailed description is provided for the preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are included in the scope defined by the claims of the present application.
Claims (7)
1. An improved starting circuit of an air compressor unit is characterized by comprising a newly-increased circuit breaker DL3, a newly-increased circuit breaker DL3, a PLC control circuit of the newly-increased circuit breaker, an opening and closing control circuit of the newly-increased circuit breaker and a closing control circuit of an improved main circuit breaker, wherein the newly-increased circuit breaker DL3 is connected between a main motor M and a water resistance starting cabinet;
the PLC control loop of the newly added breaker comprises a PLC controller, a first intermediate relay K1, a second intermediate relay K2, a star-breaking intermediate relay KA1 and a main-breaking intermediate relay KA2, wherein the PLC controller is connected to a 220V alternating current power supply through a first air switch QF1, the PLC controller converts 220V alternating current into 24V direct current output, one end of a normally closed contact of the star-breaking intermediate relay KA1 is connected to a star point breaker on-position signal input end of the PLC controller, one end of a normally closed contact of the main-breaking intermediate relay KA2 is connected to a main breaker on-position signal input end of the PLC controller, one end of a normally open auxiliary contact of the newly added breaker DL3 is connected to a newly added breaker on-position signal input end of the PLC controller, the other end of a normally closed contact of the star-breaking intermediate relay KA1, the other end of a normally closed contact of the main-breaking intermediate relay KA2 and the other end of the normally open auxiliary contact of the newly added breaker DL3 are connected in parallel and then connected to a 24V direct current output end of the PLC controller, one end of a coil of a first intermediate relay K1 is connected to an output end of a PLC controller for controlling opening and closing of a newly-added breaker DL3, one end of a coil of a second intermediate relay K2 is connected to an output end of the PLC controller for controlling closing of the newly-added breaker DL3, the other end of the coil of the first intermediate relay K1 and the other end of the coil of the second intermediate relay K2 are respectively connected to a zero line N of a 220V alternating-current power supply, and an output COM end of the PLC controller is connected to a live line L of the 220V alternating-current power supply;
the newly-added breaker opening and closing control loop comprises a newly-added breaker opening control loop, a newly-added breaker closing indication loop, a newly-added breaker opening indication loop and a star point breaker opening contact expansion loop which are connected in parallel, the newly-added breaker opening control loop comprises a first intermediate relay K1 normally open contact, a newly-added breaker DL3 normally open auxiliary contact and a newly-added breaker opening coil TQDL3 which are connected in series, the newly-added breaker closing control loop comprises a second intermediate relay K2 normally open contact, a newly-added breaker DL3 normally closed auxiliary contact and a newly-added breaker closing coil HQDL3 which are connected in series, the newly-added breaker closing indication loop comprises a newly-added breaker DL3 normally open auxiliary contact and a first indicator lamp D1 which are connected in series, the newly-added breaker opening indication loop comprises a newly-added breaker DL3 normally closed auxiliary contact and a newly-added breaker closing indicator lamp D2 which are connected in series, the star point circuit breaker position contact expansion loop comprises a normally closed auxiliary contact of a star point circuit breaker DL2 and a coil of a star point intermediate relay KA1 which are connected in series; the switching-on and switching-off control circuit of the newly-added circuit breaker is connected to the power supply circuit through a second air switch QF 2;
the improved main circuit breaker switching-on control loop comprises a main circuit breaker switching-on control loop and a main circuit breaker separating contact expansion loop which are connected in parallel, wherein the main circuit breaker switching-on control loop comprises a main circuit breaker switching-on coil HQDL1, a newly-added circuit breaker DL3 normally-open auxiliary contact, a star-cut intermediate relay KA1 normally-open contact and an original control loop of a main circuit breaker DL1 which are connected in series, and the main circuit breaker separating contact expansion loop comprises a main circuit breaker DL1 normally-closed auxiliary contact and a main-cut intermediate relay KA2 coil which are connected in series; the modified main breaker closing control circuit is connected to a power supply circuit through a third air switch QF 3.
2. The improved starting circuit of the air compressor set according to claim 1, wherein the newly added circuit breaker PLC control circuit further comprises a third intermediate relay K3 and an audible and visual alarm BJQ, one end of a coil of the third intermediate relay K3 is connected to a newly added circuit breaker DL3 movement rejection alarm control output end of the PLC controller, the other end of a coil of the third intermediate relay K3 is connected to a zero line N of the 220V alternating current power supply, normally open contacts of the audible and visual alarm BJQ and the third intermediate relay K3 are connected in series and then connected in parallel to a position between the zero line N and a live line L of the 220V alternating current power supply, one end of a reset button of the audible and visual alarm BJQ is connected to an alarm reset signal input end of the PLC controller, and the other end of the reset button of the audible and visual alarm BJQ is connected to a 24V direct current output end of the PLC controller.
3. The improved starting circuit of air compressor set as claimed in claim 2, wherein the output terminal of the PLC controller for controlling the opening of the additional breaker DL3 is formed by connecting two output ports in parallel.
4. The improved starting circuit of the air compressor set as claimed in claim 3, wherein the output terminal of the PLC controller for controlling the closing of the newly added circuit breaker DL3 is formed by connecting two other output ports in parallel.
5. The improved starting circuit for air compressor set as claimed in claim 4, wherein the first indicator light D1 and the second indicator light D2 are different colors.
6. The improved starting circuit for air compressor set as claimed in claim 5, wherein the first indicator light D1 is red and the second indicator light D2 is green.
7. The improved starting circuit for air compressor set as claimed in claim 6, wherein the newly added breaker DL3 is a vacuum breaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120803319.3U CN214900691U (en) | 2021-04-20 | 2021-04-20 | Improved starting circuit of air compressor unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120803319.3U CN214900691U (en) | 2021-04-20 | 2021-04-20 | Improved starting circuit of air compressor unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214900691U true CN214900691U (en) | 2021-11-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120803319.3U Active CN214900691U (en) | 2021-04-20 | 2021-04-20 | Improved starting circuit of air compressor unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214900691U (en) |
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2021
- 2021-04-20 CN CN202120803319.3U patent/CN214900691U/en active Active
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