CN106684818A - Overvoltage protection circuit, overvoltage protection method and overvoltage protection device - Google Patents
Overvoltage protection circuit, overvoltage protection method and overvoltage protection device Download PDFInfo
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- CN106684818A CN106684818A CN201710144945.4A CN201710144945A CN106684818A CN 106684818 A CN106684818 A CN 106684818A CN 201710144945 A CN201710144945 A CN 201710144945A CN 106684818 A CN106684818 A CN 106684818A
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- compressor
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- current value
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal fluid pressure, liquid level or liquid displacement, e.g. Buchholz relays
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Abstract
The invention provides an overvoltage protection circuit, an overvoltage protection method and an overvoltage protection device wherein the overvoltage protection circuit is applied to a compressor and comprises a relay in series connection with a contactor switch and a pressure switch to control the operation of the compressor by triggering the contactor switch to close upon obtaining a power-on signal; a current sensor in connection with the contactor switch to detect the current value across the compressor; and a control module in connection with the relay, the pressure switch and the current sensor. When the pressure switch detects that the working pressure is smaller than the preset pressure, the pressure switch is closed with the result that a corresponding closed signal is generated.
Description
Technical field
The present invention relates to Compressor Technology field, in particular to a kind of overvoltage crowbar, a kind of overvoltage protection side
Method and a kind of over-pressure safety device.
Background technology
In correlation technique, work under too high pressure working condition to reduce compressor, generally set in compressor assembly
Mechanical pressure switch or software control system are put, the working condition pressure of compressor is detected with this, so as to control compressor
Open and close, although disclosure satisfy that most basic compressor overvoltage protection demand, but exist in actual application
Following defect：
(1) mechanical pressure switch, the industrial and mineral pressure x velocity for responding compressor is too fast, causes frequently opening for compressor
It is dynamic, frequently start compressor is caused to damage for a long time；
(2) software control system, arranges pressure transducer on compressor assembly, and software control system is by analyzing pressure
The data of sensor, control the closing of compressor and start, but, software control system has response time delay, it is impossible to timely
The working condition pressure of compressor is made a response, and needs periodically to assess the safety of software control system.
Therefore, how the working condition pressure of compressor responded in time, and reduces the frequency of high frequent startup
Rate, has become problem demanding prompt solution.
The content of the invention
It is contemplated that at least solving one of technical problem present in prior art or correlation technique.
For this purpose, it is an object of the present invention to proposing a kind of overvoltage crowbar.
Further object is that proposing a kind of over-voltage protection method.
Another object of the present invention is to propose a kind of over-pressure safety device.
For achieving the above object, a kind of one embodiment according to a first aspect of the present invention, it is proposed that overvoltage crowbar,
Suitable for compressor, overvoltage crowbar is provided with contactless contactor and pressure switch, and contactless contactor is located at compressor and power supply
Between source, pressure switch is connected to contactless contactor, and pressure switch detects the working condition pressure of compressor more than or equal to default
Disconnect during pressure, and then trigger contactless contactor and disconnect, to control compressor shutdown, overvoltage crowbar also includes：Relay,
It is connected in series with contactless contactor and pressure switch, triggering contactless contactor closure when relay obtains power on signal, to control
Compressor operating；Current sensor, is connected to contactless contactor, for the current value of detection stream Jing compressor；Control module, even
Relay, pressure switch and current sensor are connected to, when pressure switch detects working condition pressure less than preset pressure, pressure switch
Close and generate corresponding closure signal；Control module is obtained after closure signal, is determined according to the persistent period that current value is zero
Whether power on signal is generated.
According to an embodiment of the invention overvoltage crowbar, is detected in time by the pressure switch in overvoltage crowbar
The working condition pressure of compressor, and the open and close of compressor are controlled by contactless contactor, it is being more than so as to reduce compressor
The phenomenon worked under preset pressure state, meanwhile, with reference to current sensor and control module in overvoltage crowbar, control pressure
The time interval that contracting machine is frequently opened, so as to realize reducing compressor because working condition pressure is too high or frequent unlatching causes to damage
Effect.
Specifically, when the working condition pressure of compressor is more than preset pressure, the pressure switch in overvoltage crowbar is rapid
Mechanical disconnection is realized, because pressure switch is connected in the circuit being made up of relay and contactless contactor, so contact
Disconnected by the auxiliary contact of Control on device switch, auxiliary contact disconnect disconnects the main contacts of contactless contactor, causes
Power supply and compressor power-off, so as to protect compressor not damaged by too high working condition pressure.
In addition, the outfan of control module is connected with relay, the break-make of control module control relay, so as to control to connect
Tentaculum is switched on-off, and the input of control module connects current sensor and pressure switch, and current sensor is leaned on for detection
Electric current on nearly compressor side power line, during determining whether compressor is in off-mode and lasting compressor off-mode
Between, control whether to be generated to relay so as to whether be closed according to compressor off-mode persistent period and pressure switch
The signal of telecommunication, so as to control whether compressor starts shooting, reduces the effect of compressor open frequency.
Wherein, in order to avoid the abrasion that frequent start-stop compressor is caused to compressor, generally arrange adjacent power-on operation and
Time (i.e. off-mode persistent period) between power-off operation is more than 180 seconds.
Overvoltage crowbar according to the abovementioned embodiments of the present invention, can also have following technical characteristic：
According to one embodiment of present invention, it is preferable that control module includes：Memorizer, is connected to current sensor, uses
In duration threshold and the real-time storage current value of prestoring；Comparator, is connected to memorizer, current sensor and pressure switch,
For when the closure signal of pressure switch feedback is obtained, judging whether the persistent period that current value is zero is more than or equal to persistently
Time threshold, and when judging that the persistent period is more than or equal to duration threshold, generate power on signal；Comparator is additionally operable to：
After power on signal is generated, current value and the persistent period of core dump memory clear real-time storage is triggered.
Overvoltage crowbar according to an embodiment of the invention, by arranging memorizer in control module, memorizer is pre-
The duration threshold that user is arranged first is stored, after compressor is closed because pressure switch disconnects, current sensor detection
To current value be zero, and current value signals are input to into memorizer, memorizer records the moment t1 of current value signals, and remembers
The record current value signals persistent period, when pressure switch is closed, pressure switch to memorizer sends switch closure signals, memorizer
The current value signals persistent period (i.e. the absolute difference of t2 and t1) is counted in the moment t2 for receiving switch closure signals, this
When, the comparator arranged in control module equally receives the current value signals that current sensor is detected, when pressure switch is closed
During conjunction, comparator receives the closure signal of pressure switch closed feedback, and judge persistent period that current value is zero (i.e. t2 with
The absolute difference of t1) whether it is more than or equal to duration threshold (being typically set to 3~10 minutes), when current value signals continue
When time is more than duration threshold, control module to relay generates power on signal, and control compressor start otherwise continues to control
Compressor shutdown processed, starts shooting again until the current value signals persistent period is more than after duration threshold, realizes reduction compressor
Because frequently unlatching causes the effect of failure.
According to the second aspect of the invention, it is proposed that a kind of over-voltage protection method, it is adaptable to the overvoltage protection of first aspect
Circuit, including：The working condition pressure of real-time detection compressor；When working condition pressure is detected more than or equal to preset pressure, control
Compressor shutdown, the current value for now flowing through compressor is zero；When working condition pressure is detected less than preset pressure, generate corresponding
Closure signal；After closure signal is received, determined whether to generate power on signal according to the persistent period that current value is zero, its
In, power on signal is used to control compressor operating.
In the technical scheme, work under too high working condition pressure to reduce compressor, the operating mode pressure to compressor
Power carries out real-time detection, when the working conditions of compressor pressure for detecting is more than preset pressure, controls compressor shutdown, and by inspection
The time that the operating current real-time judge compressor of measured compressed machine is closed, when working conditions of compressor pressure diminishes and less than preset pressure
When, closure signal is sent, the time that compressor is closed is counted at the moment for sending closure signal, closed according to the compressor of statistics
Time determines whether to open compressor, reduces compressor and works under too high working condition pressure, meanwhile, reduce the frequency of compressor
The frequency of numerous unlatching, realizes the protective effect to compressor.
Further, the working condition pressure in the pipe-line system that compressor is located can also be detected, such as, when in pipe-line system
A certain position block when, cause the pressure rise of pipe-line system, in order to prevent infringement of the high pressure to pipe-line system, real-time detection
Pressure in pipe-line system, when the pressure rise in pipe-line system, close compressor slows down compressor to defeated in pipe-line system
Pressurization pressure, so as to reduce infringement of the high pressure to pipe-line system.
Additionally, the working condition pressure of detection can be the loine pressure in air conditioning system, such as, and the pressure of exhaust outlet of compressor side
Pressure or the pressure in condenser pipe in power, evaporation pipeline, so as to improve the safety of whole air-conditioning system pipeline.
Additionally, using mechanical control during control compressor shutdown, mechanical control has reaction fast, can
Infringement of the high pressure to compressor or pipe-line system is reduced to greatest extent, and control compressor uses machinery, electricity when starting shooting
The mode that road and software are combined, realizes rapid, the safe effect of compressor start.
Over-voltage protection method according to the second aspect of the invention, can also have following technical characteristic：
According to one embodiment of present invention, it is preferable that after closure signal is received, it is zero to continue according to current value
Time determines whether to generate power on signal, specifically includes：After closure signal is received, the persistent period that current value is zero is judged
Whether duration threshold is more than or equal to；It is more than or equal to duration threshold in the persistent period that Cutoff current value is zero
When, power on signal is generated, to trigger compressor operating.
In the technical scheme, in order to reduce the frequency of high frequent unlatching, in working conditions of compressor pressure by high conversion
For it is normal when, detect compressor close time, when compressor close time it is too short when, open compressor compressor is had
Detrimental effect, in order to reduce the frequency of high frequent unlatching, is only more than duration threshold when the time that compressor is closed
When, compressor is opened, realize the effect for improving compressor safety.
Specifically, determine that working conditions of compressor pressure is converted to normally by height by closure signal, it is electromechanical by statistics compression
Flow valuve is the shut-in time that zero persistent period (i.e. the absolute difference of t2 and t1) judges compressor, by arranging the persistent period
Threshold value (being typically set to 3~10 minutes) determines the normal period of switching time of compressor, so as to improve the safety of compressor switch
Property.
According to one embodiment of present invention, it is preferable that also include：Prestore duration threshold；Real-time storage current value,
To count the persistent period that current value is zero.
In the technical scheme, by the duration threshold that prestores, the time interval of compressor normal switch is determined, opening
Before opening compressor, the shut-in time of compressor is determined by counting the persistent period that current value is zero, so as to judge compressor
Whether can normally be opened.
Specifically, the property of the pipe-line system that duration threshold can be located according to compressor performance parameter or compressor
Energy parameter, it is determined that rational duration threshold, so as to realize the effect that compressor works under normal operating mode.
According to one embodiment of present invention, it is preferable that also include：After power on signal is generated, it is zero to remove current value
Persistent period.
In the technical scheme, for the mistake occurred during reducing the persistent period that statistics current value is zero, and
The maloperation to compressor is reduced, after power on signal is generated, the persistent period that current value is zero is removed, so as to realize accurately control
The effect of compressor switch processed.
Specifically, determine that working conditions of compressor pressure is converted to normally by height by closure signal, it is electromechanical by statistics compression
Flow valuve is the shut-in time that zero persistent period (i.e. the absolute difference of t2 and t1) judges compressor, by arranging the persistent period
Threshold value (being typically set to 3~10 minutes) determines the normal period of switching time of compressor, so as to improve the safety of compressor switch
Property.
A kind of 3rd face of the invention, it is proposed that over-pressure safety device, it is adaptable to the overvoltage protection electricity of first aspect
Road, including：Pressure sensing cell, for the working condition pressure of real-time detection compressor；Control unit, for detecting operating mode pressure
When power is more than or equal to preset pressure, compressor shutdown is controlled, the current value for now flowing through compressor is zero；Signal generating unit, uses
In when working condition pressure is detected less than preset pressure, corresponding closure signal is generated；Judging unit, for receiving closure
After signal, determined whether to generate power on signal according to the persistent period that current value is zero, wherein, power on signal is used to control compression
Machine runs.
In the technical scheme, work under too high working condition pressure to reduce compressor, pressure sensing cell is to pressure
The working condition pressure of contracting machine carries out real-time detection, when the working conditions of compressor pressure for detecting is more than preset pressure, control unit control
Compressor shutdown processed, and by detecting the time that the operating current real-time judge compressor of compressor is closed, work as working conditions of compressor
Pressure diminishes and during less than preset pressure, and signal generating unit sends closure signal, and at the moment for sending closure signal compressor is counted
The time of closing, judging unit determines whether to open compressor according to the compressor shut-in time of statistics, reduces compressor and exists
Work under too high working condition pressure, meanwhile, the frequency of the frequent unlatching of compressor is reduced, realize the protection to compressor and make
With.
Further, the working condition pressure in the pipe-line system that compressor is located can also be detected, such as, when in pipe-line system
A certain position block when, cause the pressure rise of pipe-line system, in order to prevent infringement of the high pressure to pipe-line system, real-time detection
Pressure in pipe-line system, when the pressure rise in pipe-line system, close compressor slows down compressor to defeated in pipe-line system
Pressurization pressure, so as to reduce infringement of the high pressure to pipe-line system.
Additionally, the working condition pressure of detection can be the loine pressure in air conditioning system, such as, and the pressure of exhaust outlet of compressor side
Pressure or the pressure in condenser pipe in power, evaporation pipeline, so as to improve the safety of whole air-conditioning system pipeline.
Additionally, using mechanical control during control compressor shutdown, mechanical control has reaction fast, can
Infringement of the high pressure to compressor or pipe-line system is reduced to greatest extent, and control compressor uses machinery, electricity when starting shooting
The mode that road and software are combined, realizes rapid, the safe effect of compressor start.
Specifically, determine that working conditions of compressor pressure is converted to normally by height by closure signal, it is electromechanical by statistics compression
Flow valuve is the shut-in time that zero persistent period (i.e. the absolute difference of t2 and t1) judges compressor, by arranging the persistent period
Threshold value (being typically set to 3~10 minutes) determines the normal period of switching time of compressor, so as to improve the safety of compressor switch
Property.
Over-pressure safety device according to the third aspect of the invention we, can also have following technical characteristic：
According to one embodiment of present invention, it is preferable that judging unit specifically for：After closure signal is received, sentence
Power-off flow valuve is whether zero persistent period is more than or equal to duration threshold；Signal generating unit is specifically additionally operable to：Judging electricity
When flow valuve is zero persistent period to be more than or equal to duration threshold, power on signal is generated, to trigger compressor operating.
In the technical scheme, in order to reduce the frequency of high frequent unlatching, in working conditions of compressor pressure by high conversion
For it is normal when, detect compressor close time, when judging unit judge compressor close time it is too short when, unlatching compressor
There is detrimental effect to compressor, in order to reduce the frequency of high frequent unlatching, only when the time that compressor is closed is more than
During duration threshold, signal generating unit generates power on signal, and now, compressor is opened, and is realized and is improved compressor safety
Effect.
Specifically, determine that working conditions of compressor pressure is converted to normally by height by closure signal, it is electromechanical by statistics compression
Flow valuve is the shut-in time that zero persistent period (i.e. the absolute difference of t2 and t1) judges compressor, by arranging the persistent period
Threshold value (being typically set to 3~10 minutes) determines the normal period of switching time of compressor, so as to improve the safety of compressor switch
Property.
According to one embodiment of present invention, it is preferable that also include：Pre- memory cell, for the duration threshold that prestores；Meter
Shi Danyuan, for real-time storage current value, to count the persistent period that current value is zero.
In the technical scheme, prestored duration threshold by pre- memory cell, determine the time of compressor normal switch
Interval, before compressor is opened, when determining the closing of compressor by the persistent period that timing unit statistics current value is zero
Between, so as to judge whether compressor can normally be opened.
Specifically, the property of the pipe-line system that duration threshold can be located according to compressor performance parameter or compressor
Energy parameter, it is determined that rational duration threshold, so as to realize the effect that compressor works under normal operating mode.
According to one embodiment of present invention, it is preferable that also include：Clearing cell, for generate power on signal after, clearly
Except the persistent period that current value is zero.
In the technical scheme, for the mistake occurred during reducing the persistent period that statistics current value is zero, and
The maloperation to compressor is reduced, after power on signal is generated, clearing cell removes the persistent period that current value is zero, so as to reality
Now accurately control the effect of compressor switch.
Specifically, when it is determined that the persistent period that current value is zero is more than duration threshold, control compressor start, this
When, the persistent period that the current value stored in memorizer is zero is removed, hence into next measurement period, meanwhile, reduce
The storage burden of memorizer.
The additional aspect and advantage of the present invention will be set forth in part in the description, and partly will become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become from the description with reference to accompanying drawings below to embodiment
It is substantially and easy to understand, wherein：
Fig. 1 shows the schematic diagram of the overvoltage crowbar of one embodiment of the present of invention；
Fig. 2 shows the schematic flow diagram of the over-voltage protection method of one embodiment of the present of invention；
Fig. 3 shows the schematic flow diagram of the over-voltage protection method of another embodiment of the present invention；
Fig. 4 shows the schematic flow diagram of the over-voltage protection method of yet another embodiment of the present invention；
Fig. 5 shows the schematic flow diagram of the over-voltage protection method of an alternative embodiment of the invention；
Fig. 6 shows the schematic block diagram of the over-pressure safety device of one embodiment of the present of invention；
Fig. 7 shows the schematic block diagram of the over-pressure safety device of another embodiment of the present invention；
Fig. 8 shows the schematic block diagram of the over-pressure safety device of yet another embodiment of the present invention.
Specific embodiment
It is below in conjunction with the accompanying drawings and concrete real in order to be more clearly understood that the above objects, features and advantages of the present invention
Apply mode to be further described in detail the present invention.It should be noted that in the case where not conflicting, the enforcement of the application
Feature in example and embodiment can be mutually combined.
Many details are elaborated in the following description in order to fully understand the present invention, but, the present invention may be used also
Implemented with being different from other modes described here using other, therefore, protection scope of the present invention is not by described below
Specific embodiment restriction.
Fig. 1 shows the schematic diagram of the overvoltage crowbar of one embodiment of the present of invention.
As shown in figure 1, the overvoltage crowbar of embodiment according to a first aspect of the present invention, it is adaptable to compressor 102, mistake
Voltage protection circuit is provided with contactless contactor 104 and pressure switch 106, and contactless contactor 104 is located at compressor 102 and power supply source
Between 108, pressure switch 106 is connected to contactless contactor 104, and the working condition pressure that pressure switch 106 detects compressor 102 is big
In or disconnect during equal to preset pressure, and then trigger contactless contactor 104 and disconnect, shut down with controlling compressor 102, overvoltage protection
Circuit also includes：Relay 110, is connected in series with contactless contactor 104 and pressure switch 106, and relay 110 obtains upper telecommunications
Number when triggering contactless contactor 104 close, run with controlling compressor 102；Current sensor 112, is connected to contactless contactor
104, for the current value of detection stream Jing compressor 102；Control module 114, is connected to relay 110, pressure switch 106 and electricity
Flow sensor 112, when pressure switch 106 detects working condition pressure less than preset pressure, pressure switch 106 is closed and generated corresponding
Closure signal；Control module 114 is obtained after closure signal, determines whether to generate upper electricity according to the persistent period that current value is zero
Signal.
According to an embodiment of the invention overvoltage crowbar, timely by the pressure switch 106 in overvoltage crowbar
The working condition pressure of detection compressor 102, and the open and close of compressor 102 are controlled by contactless contactor 104, so as to reduce
The phenomenon that compressor 102 works under more than preset pressure state, meanwhile, with reference to the current sensor in overvoltage crowbar
112 time intervals frequently opened with control module 114, control compressor 102, so as to realize reducing compressor 102 due to work
Condition pressure frequently opens the effect for causing to damage.
Specifically, when the working condition pressure of compressor 102 is more than preset pressure, the pressure switch in overvoltage crowbar
106 realize rapidly mechanical disconnection, because pressure switch 106 is connected on what is be made up of relay 110 and contactless contactor 104
In circuit, so the auxiliary contact controlled by relay 110 on contactless contactor 104 disconnect, auxiliary contact disconnect makes catalyst
The main contacts of switch 104 disconnects, and causes power supply 108 and the power-off of compressor 102, so as to protect compressor 102 not by too high work
Condition pressure damage.
In addition, the outfan of control module 114 is connected with relay 110, the control relay 110 of control module 114 it is logical
It is disconnected, so as to the break-make of control contactor switch 104, the input connection current sensor 112 of control module 114 and pressure switch
106, current sensor 112 is used to detect the electric current on the line of 102 side power supply of compressor 108, whether to determine compressor 102
In off-mode and the off-mode persistent period of compressor 102, so as to according to the off-mode persistent period of compressor 102 with
And whether pressure switch 106 closes to control whether to generate power on signal to relay 110, so as to whether control compressor 102
Start, so as to reduce the effect of the open frequency of compressor 102.
Overvoltage crowbar according to the abovementioned embodiments of the present invention, can also have following technical characteristic：
According to one embodiment of present invention, it is preferable that control module 114 includes：Memorizer, is connected to current sensor
112, for duration threshold and the real-time storage current value of prestoring；Comparator, is connected to memorizer, the and of current sensor 112
Pressure switch 106, for when the closure signal of the feedback of pressure switch 106 is obtained, judging that the persistent period that current value is zero is
It is no more than or equal to duration threshold, and judge the persistent period be more than or equal to duration threshold when, telecommunications in generation
Number；Comparator is additionally operable to：After power on signal is generated, current value and the persistent period of core dump memory clear real-time storage is triggered.
Overvoltage crowbar according to an embodiment of the invention, by arranging memorizer, memorizer in control module 114
The duration threshold of user's setting is prestored, after compressor 102 is closed because pressure switch 106 disconnects, electric current is passed
The current value that sensor 112 is detected is zero, and current value signals are input to into memorizer, and memorizer records current value signals
Moment, and record current value signal persistent period, when pressure switch 106 is closed, pressure switch 106 to memorizer sends switch
Closure signal, memorizer counts current value signals persistent period, now, control module at the moment for receiving switch closure signals
The comparator arranged in 114 equally receives the current value signals that current sensor 112 is detected, when pressure switch 106 is closed
When, comparator receives the closure signal of the closed feedback of pressure switch 106, and judges whether the persistent period that current value is zero is big
In or equal to duration threshold, when the current value signals persistent period duration threshold is more than, control module 114 is to relay
Device 110 generates power on signal, and control compressor 102 is started shooting, and otherwise continues control compressor 102 and shuts down, until current value signals
Persistent period, more than starting shooting again after duration threshold, realizes and reduces compressor 102 due to frequently opening the effect for causing failure
Really.
Fig. 2 to Fig. 5 shows the schematic flow diagram of the over-voltage protection method of one embodiment of the present of invention.
As shown in Fig. 2 over-voltage protection method according to an embodiment of the invention, it is adaptable to the overvoltage protection electricity of first aspect
Road, including：Step S202, the working condition pressure of real-time detection compressor；Step S204, is more than or equal to working condition pressure is detected
During preset pressure, compressor shutdown is controlled, the current value for now flowing through compressor is zero；Step S206, is detecting operating mode pressure
When power is less than preset pressure, corresponding closure signal is generated；Step S208, after closure signal is received, be according to current value
Zero persistent period determines whether to generate power on signal, wherein, power on signal is used to control compressor operating.
In this embodiment, work under too high working condition pressure to reduce compressor, the working condition pressure to compressor
Real-time detection is carried out, when the working conditions of compressor pressure for detecting is more than preset pressure, compressor shutdown is controlled, and by detection
The time that the operating current real-time judge compressor of compressor is closed, when working conditions of compressor pressure diminishes and less than preset pressure
When, closure signal is sent, the time that compressor is closed is counted at the moment for sending closure signal, closed according to the compressor of statistics
Time determines whether to open compressor, reduces compressor and works under too high working condition pressure, meanwhile, reduce compressor
The frequency frequently opened, realizes the protective effect to compressor.
Further, the working condition pressure in the pipe-line system that compressor is located can also be detected, such as, when in pipe-line system
A certain position block when, cause the pressure rise of pipe-line system, in order to prevent infringement of the high pressure to pipe-line system, real-time detection
Pressure in pipe-line system, when the pressure rise in pipe-line system, close compressor slows down compressor to defeated in pipe-line system
Pressurization pressure, so as to reduce infringement of the high pressure to pipe-line system.
Additionally, the working condition pressure of detection can be the loine pressure in air conditioning system, such as, and the pressure of exhaust outlet of compressor side
Pressure or the pressure in condenser pipe in power, evaporation pipeline, so as to improve the safety of whole air-conditioning system pipeline.
Additionally, using mechanical control during control compressor shutdown, mechanical control has reaction fast, can
Infringement of the high pressure to compressor or pipe-line system is reduced to greatest extent, and control compressor uses machinery, electricity when starting shooting
The mode that road and software are combined, realizes rapid, the safe effect of compressor start.
Specifically, determine that working conditions of compressor pressure is converted to normally by height by closure signal, it is electromechanical by statistics compression
Flow valuve is the shut-in time that zero persistent period (i.e. the absolute difference of t2 and t1) judges compressor, by arranging the persistent period
Threshold value (being typically set to 3~10 minutes) determines the normal period of switching time of compressor, so as to improve the safety of compressor switch
Property.
Over-voltage protection method according to the second aspect of the invention, can also have following technical characteristic：
As shown in figure 3, according to one embodiment of present invention, it is preferable that after closure signal is received, according to current value
Be zero persistent period determine whether generate power on signal, specifically include：Step S2082, after closure signal is received, judges
Current value is whether zero persistent period is more than or equal to duration threshold；Step S2084, is zero to hold in Cutoff current value
When the continuous time is more than or equal to duration threshold, power on signal is generated, to trigger compressor operating.
In this embodiment, in order to reduce the frequency that high frequent is opened, be converted to by height in working conditions of compressor pressure
When normal, the time that detection compressor is closed, when the time that compressor is closed is too short, opens compressor and there is damage to compressor
Evil effect, in order to reduce the frequency of high frequent unlatching, only when the time that compressor is closed duration threshold is more than,
Compressor is opened, the effect for improving compressor safety is realized.
Specifically, determine that working conditions of compressor pressure is converted to normally by height by closure signal, it is electromechanical by statistics compression
Flow valuve is the shut-in time that zero persistent period judges compressor, determines that compressor is normally opened by arranging duration threshold
Time interval is closed, so as to improve the safety of compressor switch.
As shown in figure 4, according to one embodiment of present invention, it is preferable that also include：Step S402, prestores the persistent period
Threshold value；Step S408, real-time storage current value, to count the persistent period that current value is zero.
In this embodiment, by the duration threshold that prestores, determine the time interval of compressor normal switch, opening
Before compressor, by counting the persistent period that current value is zero shut-in time of compressor is determined, so as to judge that compressor is
It is no normally to be opened.
Specifically, the property of the pipe-line system that duration threshold can be located according to compressor performance parameter or compressor
Energy parameter, it is determined that rational duration threshold, so as to realize the effect that compressor works under normal operating mode.
As shown in figure 5, according to one embodiment of present invention, it is preferable that also include：Step S514, the telecommunications in generation
After number, the persistent period that current value is zero is removed, so as to realize accurately controlling the effect of compressor switch.
In this embodiment, for the mistake occurred during reducing the persistent period that statistics current value is zero, and subtract
Few maloperation to compressor, after power on signal is generated, removes the persistent period that current value is zero, so as to improve control compression
The accuracy of machine.
Specifically, when it is determined that the persistent period that current value is zero is more than duration threshold, control compressor start, this
When, the persistent period that the current value stored in memorizer is zero is removed, hence into next measurement period, meanwhile, reduce
The storage burden of memorizer.
Fig. 6 to Fig. 8 shows the schematic block diagram of the over-pressure safety device 600 of one embodiment of the present of invention.
As shown in fig. 6, over-pressure safety device 600 according to an embodiment of the invention, it is adaptable to the overvoltage guarantor of first aspect
Protection circuit, including：Pressure sensing cell 602, for the working condition pressure of real-time detection compressor；Control unit 604, in inspection
When measuring working condition pressure more than or equal to preset pressure, compressor shutdown is controlled, the current value for now flowing through compressor is zero；It is raw
Into unit 606, for when working condition pressure is detected less than preset pressure, generating corresponding closure signal；Judging unit 608,
For after closure signal is received, being determined whether to generate power on signal according to the persistent period that current value is zero, wherein, upper electricity
Signal is used to control compressor operating.
In this embodiment, work under too high working condition pressure to reduce compressor, 602 pairs of pressures of pressure sensing cell
The working condition pressure of contracting machine carries out real-time detection, when the working conditions of compressor pressure for detecting is more than preset pressure, control unit 604
Control compressor shutdown, and by detecting the time that the operating current real-time judge compressor of compressor is closed, when compressor work
Condition pressure diminishes and during less than preset pressure, and signal generating unit 606 sends closure signal, and at the moment for sending closure signal pressure is counted
The time that contracting office closes, judging unit 608 determines whether to open compressor according to the compressor shut-in time of statistics, reduces pressure
Contracting machine works under too high working condition pressure, meanwhile, the frequency of the frequent unlatching of compressor is reduced, realize to compressor
Protective effect.
Further, the working condition pressure in the pipe-line system that compressor is located can also be detected, such as, when in pipe-line system
A certain position block when, cause the pressure rise of pipe-line system, in order to prevent infringement of the high pressure to pipe-line system, real-time detection
Pressure in pipe-line system, when the pressure rise in pipe-line system, close compressor slows down compressor to defeated in pipe-line system
Pressurization pressure, so as to reduce infringement of the high pressure to pipe-line system.
Additionally, the working condition pressure of detection can be the loine pressure in air conditioning system, such as, and the pressure of exhaust outlet of compressor side
Pressure or the pressure in condenser pipe in power, evaporation pipeline, so as to improve the safety of whole air-conditioning system pipeline.
Additionally, using mechanical control during control compressor shutdown, mechanical control has reaction fast, can
Infringement of the high pressure to compressor or pipe-line system is reduced to greatest extent, and control compressor uses machinery, electricity when starting shooting
The mode that road and software are combined, realizes rapid, the safe effect of compressor start.
Specifically, determine that working conditions of compressor pressure is converted to normally by height by closure signal, it is electromechanical by statistics compression
Flow valuve is the shut-in time that zero persistent period (i.e. the absolute difference of t2 and t1) judges compressor, by arranging the persistent period
Threshold value (being typically set to 3~10 minutes) determines the normal period of switching time of compressor, so as to improve the safety of compressor switch
Property.
Over-pressure safety device according to the third aspect of the invention we, can also have following technical characteristic：
As shown in fig. 6, according to one embodiment of present invention, it is preferable that judging unit 608 specifically for：Receiving
After closure signal, judge whether the persistent period that current value is zero is more than or equal to duration threshold；Signal generating unit 606 is concrete
It is additionally operable to：When the persistent period that Cutoff current value is zero duration threshold is more than or equal to, power on signal is generated, to trigger
Compressor operating.
In this embodiment, in order to reduce the frequency that high frequent is opened, be converted to by height in working conditions of compressor pressure
When normal, the time that compressor is closed is detected, when judging unit 608 judges that the time that compressor is closed is too short, open compression
Machine has detrimental effect to compressor, only big when the time that compressor is closed in order to reduce the frequency of high frequent unlatching
When duration threshold, signal generating unit 606 generates power on signal, and now, compressor is opened, and realizes raising compressor safety
The effect of property.
Specifically, determine that working conditions of compressor pressure is converted to normally by height by closure signal, it is electromechanical by statistics compression
Flow valuve is the shut-in time that zero persistent period judges compressor, determines that compressor is normally opened by arranging duration threshold
Time interval is closed, so as to improve the safety of compressor switch.
As shown in fig. 7, according to one embodiment of present invention, it is preferable that also include：Pre- memory cell 610, holds for prestoring
Continuous time threshold；Timing unit 612, for real-time storage current value, to count the persistent period that current value is zero.
In this embodiment, prestored duration threshold by pre- memory cell 610, determine the time of compressor normal switch
Interval, before compressor is opened, the closing of compressor is determined by the persistent period that the statistics current value of timing unit 612 is zero
Time, so as to judge whether compressor can normally be opened.
Specifically, the property of the pipe-line system that duration threshold can be located according to compressor performance parameter or compressor
Energy parameter, it is determined that rational duration threshold, so as to realize the effect that compressor works under normal operating mode.
As shown in figure 8, according to one embodiment of present invention, it is preferable that also include：Clearing cell 614, for generating
After power on signal, the persistent period that current value is zero is removed.
In this embodiment, for the mistake occurred during reducing the persistent period that statistics current value is zero, and subtract
Few maloperation to compressor, after power on signal is generated, clearing cell 614 removes the persistent period that current value is zero, so as to
Realize the effect of accurately control compressor switch.
Specifically, determine that working conditions of compressor pressure is converted to normally by height by closure signal, it is electromechanical by statistics compression
Flow valuve is the shut-in time that zero persistent period (i.e. the absolute difference of t2 and t1) judges compressor, by arranging the persistent period
Threshold value (being typically set to 3~10 minutes) determines the normal period of switching time of compressor, so as to improve the safety of compressor switch
Property.
One of ordinary skill in the art will appreciate that all or part of step in the various methods of above-described embodiment is can
Completed with instructing the hardware of correlation by program, the program can be stored in a computer-readable recording medium, storage
Medium include read only memory (Read-Only Memory, ROM), random access memory (Random Access Memory,
RAM), programmable read only memory (Programmable Read-only Memory, PROM), erasable programmable is read-only deposits
Reservoir (Erasable Programmable Read Only Memory, EPROM), disposable programmable read only memory (One-
Time Programmable Read-Only Memory, OTPROM), the electronics formula of erasing can make carbon copies read only memory
(Electrically-Erasable Programmable Read-Only Memory, EEPROM), read-only optical disc (Compact
Disc Read-Only Memory, CD-ROM) or other disk storages, disk memory, magnetic tape storage or can
For carrying or computer-readable any other medium of data storage.
Technical scheme is described in detail above in association with accompanying drawing, it is contemplated that the fingerprint recognition proposed in correlation technique
Technical problem, the present invention proposes a kind of overvoltage crowbar, over-voltage protection method and over-pressure safety device, by using mistake
The working condition pressure and initiation culture of voltage protection circuit control compressor, solve compressor working condition pressure is too high and frequent starting
Problem.
The preferred embodiments of the present invention are the foregoing is only, the present invention is not limited to, for the skill of this area
For art personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of overvoltage crowbar, it is adaptable to which compressor, the overvoltage crowbar is provided with contactless contactor and pressure switch,
The contactless contactor is located between the compressor and power supply source, and the pressure switch is connected to the contactless contactor, institute
State pressure switch and detect the working condition pressure of the compressor more than or equal to disconnection during preset pressure, and then trigger the contact
Device is switched off, to control the compressor shutdown, it is characterised in that the overvoltage crowbar also includes：
Relay, is connected in series with the contactless contactor and the pressure switch, and the relay is touched when obtaining power on signal
Closure of sending out contactless contactor described, to control the compressor operating；
Current sensor, is connected to the contactless contactor, for the current value that detection flows through the compressor；
Control module, is connected to the relay, the pressure switch and the current sensor, and the pressure switch is detected
When the working condition pressure is less than the preset pressure, the pressure switch closes and generates corresponding closure signal；
The control module is obtained after the closure signal, is determined whether to generate institute according to the persistent period that the current value is zero
State power on signal.
2. overvoltage crowbar according to claim 1, it is characterised in that the control module includes：
Memorizer, is connected to the current sensor, for the current value described in duration threshold and real-time storage that prestores；
Comparator, is connected to the memorizer, current sensor and the pressure switch, for anti-in the acquisition pressure switch
During the closure signal of feedback, judge that whether the persistent period that the current value is zero is more than or equal to duration threshold, and sentencing
When the fixed persistent period is more than or equal to the duration threshold, the power on signal is generated；
The comparator is additionally operable to：After the power on signal is generated, the electricity of real-time storage described in the core dump memory clear is triggered
Flow valuve and the persistent period.
3. a kind of over-voltage protection method, it is adaptable to overvoltage crowbar as claimed in claim 1 or 2, it is characterised in that described
Over-voltage protection method includes：
The working condition pressure of compressor described in real-time detection；
When the working condition pressure is detected more than or equal to preset pressure, the compressor shutdown is controlled, now flowed through described
The current value of compressor is zero；
When the working condition pressure is detected less than the preset pressure, corresponding closure signal is generated；
After the closure signal is received, determined whether to generate power on signal according to the persistent period that the current value is zero,
Wherein, the power on signal is used to control the compressor operating.
4. over-voltage protection method according to claim 3, it is characterised in that described after the closure signal is received,
Determined whether to generate power on signal according to the persistent period that the current value is zero, specifically included：
After the closure signal is received, judge whether the persistent period that the current value is zero is more than or equal to the persistent period
Threshold value；
When judging the current value and being more than or equal to the duration threshold as zero persistent period, the upper telecommunications is generated
Number, to trigger the compressor operating.
5. over-voltage protection method according to claim 4, it is characterised in that also include：
Prestore the duration threshold；
Current value described in real-time storage, to count the persistent period that the current value is zero.
6. the over-voltage protection method according to any one of claim 3 to 5, it is characterised in that also include：
After the power on signal is generated, the persistent period that the current value is zero is removed.
7. a kind of over-pressure safety device, it is adaptable to overvoltage crowbar as claimed in claim 1 or 2, it is characterised in that described
Over-pressure safety device includes：
Pressure sensing cell, for the working condition pressure of compressor described in real-time detection；
Control unit, for when the working condition pressure is detected more than or equal to preset pressure, controlling the compressor shutdown,
The current value for now flowing through the compressor is zero；
Signal generating unit, for when the working condition pressure is detected less than the preset pressure, generating corresponding closure signal；
Judging unit, for after the closure signal is received, being determined whether according to the persistent period that the current value is zero
Generate power on signal,
Wherein, the power on signal is used to control the compressor operating.
8. over-pressure safety device according to claim 7, it is characterised in that
The judging unit specifically for：After the closure signal is received, the persistent period that the current value is zero is judged
Whether duration threshold is more than or equal to；
The signal generating unit is specifically additionally operable to：Judge the current value as zero persistent period more than or equal to it is described continue when
Between threshold value when, the power on signal is generated, to trigger the compressor operating.
9. over-pressure safety device according to claim 8, it is characterised in that also include：
Pre- memory cell, for the duration threshold that prestores；
Timing unit, for current value described in real-time storage, to count the persistent period that the current value is zero.
10. the over-pressure safety device according to any one of claim 7 to 9, it is characterised in that also include：
Clearing cell, for after the power on signal is generated, removing the persistent period that the current value is zero.
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| CN201710144945.4A CN106684818B (en) | 2017-03-13 | 2017-03-13 | Overvoltage crowbar, over-voltage protection method and over-pressure safety device |
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| CN201710144945.4A CN106684818B (en) | 2017-03-13 | 2017-03-13 | Overvoltage crowbar, over-voltage protection method and over-pressure safety device |
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Cited By (5)
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| CN107084514A (en) * | 2017-06-26 | 2017-08-22 | 广东美的暖通设备有限公司 | A kind of device protected for air-conditioning system pressure and air-conditioning system |
| CN107143985A (en) * | 2017-06-26 | 2017-09-08 | 广东美的暖通设备有限公司 | A kind of device protected for air-conditioning system pressure and air-conditioning system |
| CN109309488A (en) * | 2018-08-30 | 2019-02-05 | 江苏绿城信息技术有限公司 | A kind of highly reliable on/off circuit of software and hardware control |
| CN113472144A (en) * | 2021-08-09 | 2021-10-01 | 盾石磁能科技有限责任公司 | Generator positive pressure protection system and power generation device |
| EP3992458A4 (en) * | 2019-12-16 | 2022-09-28 | GD Midea Heating & Ventilating Equipment Co., Ltd. | Pressure protection circuit, control method, and computer-readable storage medium |
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| CN107084514A (en) * | 2017-06-26 | 2017-08-22 | 广东美的暖通设备有限公司 | A kind of device protected for air-conditioning system pressure and air-conditioning system |
| CN107143985A (en) * | 2017-06-26 | 2017-09-08 | 广东美的暖通设备有限公司 | A kind of device protected for air-conditioning system pressure and air-conditioning system |
| CN107143985B (en) * | 2017-06-26 | 2020-01-31 | 广东美的暖通设备有限公司 | pressure protection device for air conditioning system and air conditioning system |
| CN109309488A (en) * | 2018-08-30 | 2019-02-05 | 江苏绿城信息技术有限公司 | A kind of highly reliable on/off circuit of software and hardware control |
| CN109309488B (en) * | 2018-08-30 | 2022-05-03 | 江苏绿城信息技术有限公司 | Software and hardware control high-reliability startup and shutdown circuit |
| EP3992458A4 (en) * | 2019-12-16 | 2022-09-28 | GD Midea Heating & Ventilating Equipment Co., Ltd. | Pressure protection circuit, control method, and computer-readable storage medium |
| CN113472144A (en) * | 2021-08-09 | 2021-10-01 | 盾石磁能科技有限责任公司 | Generator positive pressure protection system and power generation device |
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| Publication number | Publication date |
|---|---|
| CN106684818B (en) | 2018-11-13 |
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