CN106684818B - Overvoltage crowbar, over-voltage protection method and over-pressure safety device - Google Patents
Overvoltage crowbar, over-voltage protection method and over-pressure safety device Download PDFInfo
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- CN106684818B CN106684818B CN201710144945.4A CN201710144945A CN106684818B CN 106684818 B CN106684818 B CN 106684818B CN 201710144945 A CN201710144945 A CN 201710144945A CN 106684818 B CN106684818 B CN 106684818B
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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 present invention provides a kind of overvoltage crowbar, over-voltage protection method and over-pressure safety devices, wherein and overvoltage crowbar is suitable for compressor, including：Relay is connected in series with contactless contactor and pressure switch, and triggering contactless contactor is closed when relay obtains power on signal, to control compressor operating；Current sensor is connected to contactless contactor, is used for current value of the detection stream through compressor；Control module is connected to relay, pressure switch and current sensor, and when pressure switch detects that working condition pressure is less than preset pressure, pressure switch is closed and generates corresponding closure signal；After control module obtains closure signal, the duration for being zero according to current value determines whether to generate power on signal.Technical solution through the invention, the working condition pressure and initiation culture for detecting compressor using overvoltage crowbar solve the problems, such as working conditions of compressor hypertonia and frequent starting to control the open and close of compressor.
Description
Technical field
The present invention relates to Compressor Technology fields, 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 the related technology, it works under excessively high pressure working condition to reduce compressor, is usually set in compressor assembly
Mechanical pressure switch or software control system are set, the working condition pressure of compressor is detected with this, to control compressor
Open and close exist in actual application although disclosure satisfy that most basic compressor overvoltage protection demand
Following defect：
(1) mechanical pressure switch, the industrial and mineral pressure x velocity for responding compressor is too fast, leads to frequently opening for compressor
Dynamic, frequent start causes to damage to compressor for a long time；
(2) pressure sensor is arranged in software control system on compressor assembly, and software control system is by analyzing pressure
The data of sensor control the closing and startup of compressor, and still, there is software control system response to be delayed, cannot be timely
It makes a response to the working condition pressure of compressor, and needs periodically to assess the safety of software control system.
Therefore, how the working condition pressure of compressor is promptly responded, and reduces the frequency of high frequent startup
Rate has become urgent problem to be solved.
Invention content
The present invention is directed to solve at least one of the technical problems existing in the prior art or related technologies.
For this purpose, an object of the present invention is to provide a kind of overvoltage crowbars.
It is another object of the present invention to propose a kind of over-voltage protection method.
Another object of the present invention is to propose a kind of over-pressure safety device.
To achieve the above object, one embodiment according to a first aspect of the present invention, it is proposed that a kind of overvoltage crowbar,
Suitable for compressor, overvoltage crowbar is equipped with contactless contactor and pressure switch, and contactless contactor is set to compressor and power supply
Between source, pressure switch is connected to contactless contactor, and it is default that pressure switch detects that the working condition pressure of compressor is greater than or equal to
It is disconnected when pressure, and then triggers contactless contactor and disconnect, to control compressor shutdown, overvoltage crowbar further includes：Relay,
It is connected in series with contactless contactor and pressure switch, triggering contactless contactor is closed when relay obtains power on signal, with control
Compressor operating；Current sensor is connected to contactless contactor, is used for current value of the detection stream through compressor；Control module, even
It is connected to relay, pressure switch and current sensor, when pressure switch detects that working condition pressure is less than preset pressure, pressure switch
It is closed and generates corresponding closure signal；After control module obtains closure signal, the duration for being zero according to current value determines
Whether power on signal is generated.
Overvoltage crowbar according to an embodiment of the invention is detected in time by the pressure switch in overvoltage crowbar
The working condition pressure of compressor, and by contactless contactor control compressor open and close, to reduce compressor more than
The phenomenon that working under preset pressure state, meanwhile, in conjunction with the current sensor and control module in overvoltage crowbar, control pressure
The time interval that contracting machine is frequently opened reduces compressor since working condition pressure is excessively high or frequent unlatching causes to damage to realize
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, since pressure switch is connected in the circuit being made of relay and contactless contactor, so contact
It is disconnected by the auxiliary contact of relay control on device switch, auxiliary contact disconnection makes the main contacts of contactless contactor disconnect, and causes
Power supply is powered off with compressor, to protect compressor not damaged by excessively high working condition pressure.
In addition, the output end of control module is connect with relay, control module controls the break-make of relay, to which control connects
Tentaculum switches on-off, and the input terminal connection current sensor and pressure switch of control module, current sensor are leaned on for detecting
Electric current on nearly compressor side power cord, when determining whether compressor continues in off-mode and compressor off-mode
Between, to be controlled whether in relay generation according to whether compressor off-mode duration and pressure switch are closed
Electric signal achievees the effect that reduce compressor open frequency to control whether compressor is switched on.
Wherein, in order to avoid frequent start-stop compressor is worn caused by compressor, be usually arranged adjacent power-on operation and
Time (i.e. off-mode duration) 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：Memory is connected to current sensor, uses
In duration threshold and the real-time storage current value of prestoring；Comparator is connected to memory, current sensor and pressure switch,
For when obtaining the closure signal of pressure switch feedback, judging whether the duration that current value is zero is greater than or equal to persistently
Time threshold, and when judging that the duration is greater than or equal to duration threshold, generate power on signal；Comparator is additionally operable to：
After generating power on signal, current value and the duration of core dump memory clear real-time storage are triggered.
Overvoltage crowbar according to an embodiment of the invention, by the way that memory is arranged in control module, memory is pre-
The duration threshold for first storing user setting, after compressor is closed due to pressure switch disconnection, current sensor detection
To current value be zero, and current value signals are input to memory, t1 at the time of memory records current value signals, and remember
The current value signals duration is recorded, when pressure switch is closed, pressure switch sends out switch closure signals, memory to memory
T2 counts the current value signals duration (i.e. the absolute difference of t2 and t1) at the time of receiving switch closure signals, this
When, the interior comparator being arranged of control module equally receives the current value signals that current sensor detects, when pressure switch is closed
When conjunction, comparator receives the closure signal of pressure switch closed feedback, and judge duration that current value is zero (i.e. t2 with
The absolute difference of t1) whether it is greater 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 generates power on signal to relay, otherwise control compressor booting continues to control
Compressor shutdown processed, is switched on after the current value signals duration is more than duration threshold, realizes reduction compressor again
Cause the effect of failure due to frequently opening.
According to the second aspect of the invention, it is proposed that a kind of over-voltage protection method is suitable for the overvoltage protection of first aspect
Circuit, including：The working condition pressure of detection compressor in real time；When detecting that working condition pressure is greater than or equal to preset pressure, control
Compressor shutdown, the current value for flowing through compressor at this time are zero；When detecting that working condition pressure is less than preset pressure, generate corresponding
Closure signal；After receiving closure signal, the duration for being zero according to current value determines whether to generate power on signal,
In, power on signal is for controlling compressor operating.
In the technical scheme, it works under excessively high working condition pressure to reduce compressor, to the operating mode pressure of compressor
Power is measured in real time, and when the working conditions of compressor pressure detected is more than preset pressure, controls compressor shutdown, and pass through inspection
The time that the operating current real-time judge compressor of measured compressed machine is closed, when working conditions of compressor pressure becomes smaller and is less than preset pressure
When, closure signal is sent out, the time that compressor is closed is counted at the time of sending out closure signal, is closed according to the compressor of statistics
Time determines whether unlatching compressor, reduces compressor and works under excessively 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 where compressor can also be detected, for example, when in pipe-line system
A certain position block when, lead to the pressure rise of pipe-line system, in order to prevent damage of the high pressure to pipe-line system, in real time detect
Pressure in pipe-line system, when the pressure rise in pipe-line system, it is defeated into pipe-line system to slow down compressor for close compressor
Pressurization pressure, to reduce damage of the high pressure to pipe-line system.
In addition, the working condition pressure of detection can be the loine pressure in air-conditioning system, for example, the pressure of exhaust outlet of compressor side
The pressure in pressure or condenser pipe in power, evaporation tube road, to improve the safety of entire air-conditioning system pipeline.
In addition, there is reaction soon using mechanical control, mechanical control when control compressor shutdown, it can
Damage of the high pressure to compressor or pipe-line system is reduced to greatest extent, using machinery, electricity when control compressor is switched on
The mode that road and software combine realizes rapid, the safe effect of compressor booting.
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 be zero to continue according to current value after receiving closure signal
Time determines whether to generate power on signal, specifically include：After receiving closure signal, the duration that current value is zero is judged
Whether duration threshold is greater than or equal to；The duration for being zero in Cutoff current value is greater than or equal to duration threshold
When, power on signal is generated, to trigger compressor operating.
In the technical scheme, it in order to reduce the frequency of high frequent unlatching, is converted by height in working conditions of compressor pressure
When being normal, the time that detection compressor is closed, when the time that compressor is closed is too short, opening compressor has compressor
Detrimental effect is only more than duration threshold to reduce the frequency of high frequent unlatching when the time that compressor is closed
When, 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 counting compression
The shut-in time that the duration (i.e. the absolute difference of t2 and t1) that flow valuve is zero judges compressor, by the way that the duration is arranged
Threshold value (being typically set to 3~10 minutes) determines the normal period of switching time of compressor, to improve the safety of compressor switch
Property.
According to one embodiment of present invention, it is preferable that further include：Prestore duration threshold；Real-time storage current value,
To count the duration that current value is zero.
In the technical scheme, it by the duration threshold that prestores, determines the time interval of compressor normal switch, is opening
Before opening compressor, the shut-in time of compressor is determined by counting the duration that current value is zero, to judge compressor
Whether can normally be opened.
Specifically, duration threshold can be according to the property of the pipe-line system where compressor performance parameter or compressor
Can parameter, rational duration threshold is determined, to realize effect that compressor works under normal operating mode.
According to one embodiment of present invention, it is preferable that further include：After generating power on signal, it is zero to remove current value
Duration.
In the technical scheme, in order to reduce statistics current value be zero duration during occur mistake, and
The maloperation to compressor is reduced, after generating power on signal, removes the duration that current value is zero, to realize accurate 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 counting compression
The shut-in time that the duration (i.e. the absolute difference of t2 and t1) that flow valuve is zero judges compressor, by the way that the duration is arranged
Threshold value (being typically set to 3~10 minutes) determines the normal period of switching time of compressor, to improve the safety of compressor switch
Property.
Third face according to the present invention, it is proposed that a kind of over-pressure safety device is suitable for the overvoltage protection electricity of first aspect
Road, including：Pressure sensing cell, the working condition pressure for detecting compressor in real time；Control unit, for detecting operating mode pressure
When power is greater than or equal to preset pressure, compressor shutdown is controlled, the current value for flowing through compressor at this time is zero；Generation unit is used
In when detecting that working condition pressure is less than preset pressure, corresponding closure signal is generated；Judging unit, for receiving closure
After signal, the duration for being zero according to current value determines whether to generate power on signal, wherein power on signal is compressed for controlling
Machine is run.
In the technical scheme, it works under excessively high working condition pressure to reduce compressor, pressure sensing cell is to pressure
The working condition pressure of contracting machine is measured in real time, when the working conditions of compressor pressure detected is more than preset pressure, control unit control
Compressor shutdown processed, and the time closed by detecting the operating current real-time judge compressor of compressor, work as working conditions of compressor
When pressure becomes smaller and is less than preset pressure, generation unit sends out closure signal, and compressor is counted at the time of sending out closure signal
The time of closing, judging unit determine whether to open compressor according to the compressor shut-in time of statistics, reduce compressor and exist
It works under excessively high working condition pressure, meanwhile, the frequency of compressor frequently opened is reduced, the protection to compressor is realized and makees
With.
Further, the working condition pressure in the pipe-line system where compressor can also be detected, for example, when in pipe-line system
A certain position block when, lead to the pressure rise of pipe-line system, in order to prevent damage of the high pressure to pipe-line system, in real time detect
Pressure in pipe-line system, when the pressure rise in pipe-line system, it is defeated into pipe-line system to slow down compressor for close compressor
Pressurization pressure, to reduce damage of the high pressure to pipe-line system.
In addition, the working condition pressure of detection can be the loine pressure in air-conditioning system, for example, the pressure of exhaust outlet of compressor side
The pressure in pressure or condenser pipe in power, evaporation tube road, to improve the safety of entire air-conditioning system pipeline.
In addition, there is reaction soon using mechanical control, mechanical control when control compressor shutdown, it can
Damage of the high pressure to compressor or pipe-line system is reduced to greatest extent, using machinery, electricity when control compressor is switched on
The mode that road and software combine realizes rapid, the safe effect of compressor booting.
Specifically, determine that working conditions of compressor pressure is converted to normally by height by closure signal, it is electromechanical by counting compression
The shut-in time that the duration (i.e. the absolute difference of t2 and t1) that flow valuve is zero judges compressor, by the way that the duration is arranged
Threshold value (being typically set to 3~10 minutes) determines the normal period of switching time of compressor, 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 is specifically used for：After receiving closure signal, sentence
Power off whether the duration that flow valuve is zero is greater than or equal to duration threshold；Generation unit is specifically additionally operable to：In judgement electricity
When the duration that flow valuve is zero is greater than or equal to duration threshold, power on signal is generated, to trigger compressor operating.
In the technical scheme, it in order to reduce the frequency of high frequent unlatching, is converted by height in working conditions of compressor pressure
When being normal, the time that detection compressor is closed opens compressor when judging unit judges that the time that compressor is closed is too short
There is detrimental effect to compressor, in order to reduce the frequency of high frequent unlatching, be only more than when the time that compressor is closed
When duration threshold, generation unit generates power on signal, at this point, compressor is opened, realizes and improves compressor safety
Effect.
Specifically, determine that working conditions of compressor pressure is converted to normally by height by closure signal, it is electromechanical by counting compression
The shut-in time that the duration (i.e. the absolute difference of t2 and t1) that flow valuve is zero judges compressor, by the way that the duration is arranged
Threshold value (being typically set to 3~10 minutes) determines the normal period of switching time of compressor, to improve the safety of compressor switch
Property.
According to one embodiment of present invention, it is preferable that further include：Pre- memory cell, for the duration threshold that prestores；Meter
Shi Danyuan is used for real-time storage current value, to count the duration that current value is zero.
In the technical scheme, it is prestored duration threshold by pre- memory cell, determines the time of compressor normal switch
Interval, before opening compressor, when the duration for being zero by timing unit statistics current value determines the closing of compressor
Between, to judge whether compressor can normally be opened.
Specifically, duration threshold can be according to the property of the pipe-line system where compressor performance parameter or compressor
Can parameter, rational duration threshold is determined, to realize effect that compressor works under normal operating mode.
According to one embodiment of present invention, it is preferable that further include：Clearing cell is used for after generating power on signal, clearly
Except the duration that current value is zero.
In the technical scheme, in order to reduce statistics current value be zero duration during occur mistake, and
The maloperation to compressor is reduced, after generating power on signal, clearing cell removes the duration that current value is zero, to real
Now accurately control the effect of compressor switch.
Specifically, when the duration for determining that current value is zero being more than duration threshold, control compressor booting, this
When, the duration that the current value that stores is zero in memory is removed, hence into next measurement period, meanwhile, it reduces
The storage burden of memory.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description
Obviously, or practice through the invention is recognized.
Description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become in the description from combination following accompanying drawings to embodiment
Obviously and it is readily appreciated that, 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 diagrams 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 implementation mode
To better understand the objects, features and advantages of the present invention, below in conjunction with the accompanying drawings and specific real
Mode is applied the present invention is further described in detail.It should be noted that in the absence of conflict, the implementation of the application
Feature in example and embodiment can be combined with each other.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still, the present invention may be used also
To be implemented different from other modes described here using other, therefore, protection scope of the present invention is not by described below
Specific embodiment limitation.
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, is suitable for compressor 102, mistake
Voltage protection circuit is equipped with contactless contactor 104 and pressure switch 106, and contactless contactor 104 is set to compressor 102 and power supply source
Between 108, pressure switch 106 is connected to contactless contactor 104, and pressure switch 106 detects that the working condition pressure of compressor 102 is big
It is disconnected when preset pressure, and then triggers contactless contactor 104 and disconnect, to control the shutdown of compressor 102, overvoltage protection
Circuit further 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 be closed, with control compressor 102 operation；Current sensor 112, is connected to contactless contactor
104, it is used for current value of the detection stream through compressor 102；Control module 114 is connected to relay 110, pressure switch 106 and electricity
Flow sensor 112, when pressure switch 106 detects that working condition pressure is less than preset pressure, pressure switch 106 is closed and generates corresponding
Closure signal；After control module 114 obtains closure signal, the duration for being zero according to current value, which determines whether to generate, to be powered on
Signal.
Overvoltage crowbar according to an embodiment of the invention, it is timely by the pressure switch 106 in overvoltage crowbar
The working condition pressure of compressor 102 is detected, and controls the open and close of compressor 102 by contactless contactor 104, to reduce
Compressor 102 the phenomenon that working under more than preset pressure state, meanwhile, in conjunction with the current sensor in overvoltage crowbar
112 time intervals frequently opened with control module 114, control compressor 102 reduce compressor 102 due to work to realize
Condition pressure frequently opens the effect for leading 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, are made of relay 110 and contactless contactor 104 since pressure switch 106 is connected on
In circuit, so being disconnected by the auxiliary contact that relay 110 controls on contactless contactor 104, auxiliary contact disconnection makes contactor
The main contacts of switch 104 disconnects, and causes power supply 108 to be powered off with compressor 102, to protect compressor 102 not by excessively high work
Condition pressure damage.
In addition, the output end of control module 114 is connect with relay 110, control module 114 controls the logical of relay 110
It is disconnected, to the break-make of control contactor switch 104, the input terminal connection current sensor 112 and pressure switch of control module 114
106, current sensor 112 is used to detect the electric current on 102 side power supply of compressor, 108 line, whether to determine compressor 102
In the 102 off-mode duration of off-mode and compressor, to according to the 102 off-mode duration of compressor with
And whether pressure switch 106 is closed to control whether to generate power on signal to relay 110, to whether control compressor 102
Booting, to achieve the effect that reduce by 102 open frequency of compressor.
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：Memory is connected to current sensor
112, for duration threshold and the real-time storage current value of prestoring；Comparator is connected to memory, 112 and of current sensor
Pressure switch 106, for when obtaining the closure signal that pressure switch 106 is fed back, judging that the duration that current value is zero is
It is no to be greater than or equal to duration threshold, and when judging that the duration is greater than or equal to duration threshold, telecommunications in generation
Number；Comparator is additionally operable to：After generating power on signal, current value and the duration of core dump memory clear real-time storage are triggered.
Overvoltage crowbar according to an embodiment of the invention, by the way that memory, memory are arranged in control module 114
The duration threshold for prestoring user setting, after compressor 102 is closed due to the disconnection of pressure switch 106, electric current passes
The current value that sensor 112 detects is zero, and current value signals are input to memory, and memory records current value signals
Moment, and record current value signal duration, when pressure switch 106 is closed, pressure switch 106 sends out switch to memory
Closure signal, memory counts the current value signals duration at the time of receiving switch closure signals, at this point, control module
The comparator being arranged in 114 equally receives the current value signals that current sensor 112 detects, when pressure switch 106 is closed
When, comparator receives the closure signal of 106 closed feedback of pressure switch, and judges whether the duration that current value is zero is big
In or be equal to duration threshold, when the current value signals duration being more than duration threshold, control module 114 is to relay
Device 110 generates power on signal, and control compressor 102 is switched on, and otherwise continues to control the shutdown of compressor 102, until current value signals
Duration is switched on again after being more than duration threshold, realizes and reduces the effect that compressor 102 causes failure due to frequently opening
Fruit.
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, is suitable for the overvoltage protection electricity of first aspect
Road, including：Step S202 detects the working condition pressure of compressor in real time；Step S204 is detecting that working condition pressure is greater than or equal to
When preset pressure, compressor shutdown is controlled, the current value for flowing through compressor at this time is zero；Step S206 is detecting operating mode pressure
When power is less than preset pressure, corresponding closure signal is generated；Step S208 is according to current value after receiving closure signal
Zero duration determines whether to generate power on signal, wherein power on signal is for controlling compressor operating.
In this embodiment, it works under excessively high working condition pressure to reduce compressor, to the working condition pressure of compressor
It is measured in real time, when the working conditions of compressor pressure detected is more than preset pressure, controls compressor shutdown, and pass through detection
The time that the operating current real-time judge compressor of compressor is closed, when working conditions of compressor pressure becomes smaller and is less than preset pressure
When, closure signal is sent out, the time that compressor is closed is counted at the time of sending out closure signal, is closed according to the compressor of statistics
Time determines whether unlatching compressor, reduces compressor and works under excessively 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 where compressor can also be detected, for example, when in pipe-line system
A certain position block when, lead to the pressure rise of pipe-line system, in order to prevent damage of the high pressure to pipe-line system, in real time detect
Pressure in pipe-line system, when the pressure rise in pipe-line system, it is defeated into pipe-line system to slow down compressor for close compressor
Pressurization pressure, to reduce damage of the high pressure to pipe-line system.
In addition, the working condition pressure of detection can be the loine pressure in air-conditioning system, for example, the pressure of exhaust outlet of compressor side
The pressure in pressure or condenser pipe in power, evaporation tube road, to improve the safety of entire air-conditioning system pipeline.
In addition, there is reaction soon using mechanical control, mechanical control when control compressor shutdown, it can
Damage of the high pressure to compressor or pipe-line system is reduced to greatest extent, using machinery, electricity when control compressor is switched on
The mode that road and software combine realizes rapid, the safe effect of compressor booting.
Specifically, determine that working conditions of compressor pressure is converted to normally by height by closure signal, it is electromechanical by counting compression
The shut-in time that the duration (i.e. the absolute difference of t2 and t1) that flow valuve is zero judges compressor, by the way that the duration is arranged
Threshold value (being typically set to 3~10 minutes) determines the normal period of switching time of compressor, 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 receiving closure signal, according to current value
The duration for being zero determines whether to generate power on signal, specifically include：Step S2082 judges after receiving closure signal
Whether the duration that current value is zero is greater than or equal to duration threshold；Step S2084 is zero to hold in Cutoff current value
When the continuous time is greater than or equal to duration threshold, power on signal is generated, to trigger compressor operating.
In this embodiment, it in order to reduce the frequency of high frequent unlatching, is 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, open compressor has damage to compressor
Evil effect, in order to reduce the frequency of high frequent unlatching, only when the time that compressor is closed being more than duration threshold,
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 counting compression
The duration that flow valuve is zero judges the shut-in time of compressor, determines that compressor is normally opened by the way that duration threshold is arranged
Time interval is closed, to improve the safety of compressor switch.
As shown in figure 4, according to one embodiment of present invention, it is preferable that further include：Step S402, prestores the duration
Threshold value；Step S408, real-time storage current value, to count the duration that current value is zero.
In this embodiment, it by the duration threshold that prestores, determines the time interval of compressor normal switch, is opening
Before compressor, shut-in time of compressor is determined by counting the duration that current value is zero, to judge that compressor is
It is no normally to be opened.
Specifically, duration threshold can be according to the property of the pipe-line system where compressor performance parameter or compressor
Can parameter, rational duration threshold is determined, to realize effect that compressor works under normal operating mode.
As shown in figure 5, according to one embodiment of present invention, it is preferable that further include：Step S514 is generating upper telecommunications
After number, the duration that current value is zero is removed, to realize the effect for accurately controlling compressor switch.
In this embodiment, for the mistake occurred during reducing the duration that statistics current value is zero, and subtract
Few maloperation to compressor removes the duration that current value is zero after generating power on signal, to improve control compression
The accuracy of machine.
Specifically, when the duration for determining that current value is zero being more than duration threshold, control compressor booting, this
When, the duration that the current value that stores is zero in memory is removed, hence into next measurement period, meanwhile, it reduces
The storage burden of memory.
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, the overvoltage for being suitable for first aspect is protected
Protection circuit, including：Pressure sensing cell 602, the working condition pressure for detecting compressor in real time；Control unit 604, for examining
When measuring working condition pressure more than or equal to preset pressure, compressor shutdown is controlled, the current value for flowing through compressor at this time is zero；It is raw
At unit 606, for when detecting that working condition pressure is less than preset pressure, generating corresponding closure signal；Judging unit 608,
For after receiving closure signal, the duration for being zero according to current value to determine whether to generate power on signal, wherein powers on
Signal is for controlling compressor operating.
In this embodiment, it works under excessively high working condition pressure to reduce compressor, pressure sensing cell 602 is to pressure
The working condition pressure of contracting machine is measured in real time, when the working conditions of compressor pressure detected is more than preset pressure, control unit 604
The time for controlling compressor shutdown, and being closed by detecting the operating current real-time judge compressor of compressor, when compressor work
When condition pressure becomes smaller and is less than preset pressure, generation unit 606 sends out closure signal, and pressure is counted at the time of sending out closure signal
The time that contracting organ closes, judging unit 608 determine whether unlatching compressor according to the compressor shut-in time of statistics, reduce pressure
Contracting machine works under excessively high working condition pressure, meanwhile, the frequency of compressor frequently opened is reduced, is realized to compressor
Protective effect.
Further, the working condition pressure in the pipe-line system where compressor can also be detected, for example, when in pipe-line system
A certain position block when, lead to the pressure rise of pipe-line system, in order to prevent damage of the high pressure to pipe-line system, in real time detect
Pressure in pipe-line system, when the pressure rise in pipe-line system, it is defeated into pipe-line system to slow down compressor for close compressor
Pressurization pressure, to reduce damage of the high pressure to pipe-line system.
In addition, the working condition pressure of detection can be the loine pressure in air-conditioning system, for example, the pressure of exhaust outlet of compressor side
The pressure in pressure or condenser pipe in power, evaporation tube road, to improve the safety of entire air-conditioning system pipeline.
In addition, there is reaction soon using mechanical control, mechanical control when control compressor shutdown, it can
Damage of the high pressure to compressor or pipe-line system is reduced to greatest extent, using machinery, electricity when control compressor is switched on
The mode that road and software combine realizes rapid, the safe effect of compressor booting.
Specifically, determine that working conditions of compressor pressure is converted to normally by height by closure signal, it is electromechanical by counting compression
The shut-in time that the duration (i.e. the absolute difference of t2 and t1) that flow valuve is zero judges compressor, by the way that the duration is arranged
Threshold value (being typically set to 3~10 minutes) determines the normal period of switching time of compressor, 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 is specifically used for：It is receiving
After closure signal, judge whether the duration that current value is zero is greater than or equal to duration threshold；Generation unit 606 is specific
It is additionally operable to：When the duration that Cutoff current value is zero being greater than or equal to duration threshold, power on signal is generated, with triggering
Compressor operating.
In this embodiment, it in order to reduce the frequency of high frequent unlatching, is converted to by height in working conditions of compressor pressure
When normal, the time that detection compressor is closed opens compression when judging unit 608 judges that the time that compressor is closed is too short
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, generation unit 606 generates power on signal, at this point, compressor is opened, realizes and improves 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 counting compression
The duration that flow valuve is zero judges the shut-in time of compressor, determines that compressor is normally opened by the way that duration threshold is arranged
Time interval is closed, to improve the safety of compressor switch.
As shown in fig. 7, according to one embodiment of present invention, it is preferable that further include：Pre- memory cell 610, holds for prestoring
Continuous time threshold；Timing unit 612 is used for real-time storage current value, to count the duration that current value is zero.
In this embodiment, it is prestored duration threshold by pre- memory cell 610, determines the time of compressor normal switch
Interval, before opening compressor, the duration for being zero by the statistics current value of timing unit 612 determines the closing of compressor
Time, to judge whether compressor can normally be opened.
Specifically, duration threshold can be according to the property of the pipe-line system where compressor performance parameter or compressor
Can parameter, rational duration threshold is determined, to realize effect that compressor works under normal operating mode.
As shown in figure 8, according to one embodiment of present invention, it is preferable that further include：Clearing cell 614, for generating
After power on signal, the duration that current value is zero is removed.
In this embodiment, for the mistake occurred during reducing the duration that statistics current value is zero, and subtract
Few maloperation to compressor, after generating power on signal, clearing cell 614 removes the duration that current value is zero, to
Realize the effect for accurately controlling compressor switch.
Specifically, determine that working conditions of compressor pressure is converted to normally by height by closure signal, it is electromechanical by counting compression
The shut-in time that the duration (i.e. the absolute difference of t2 and t1) that flow valuve is zero judges compressor, by the way that the duration is arranged
Threshold value (being typically set to 3~10 minutes) determines the normal period of switching time of compressor, 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
It is completed with instructing relevant hardware by program, which can be stored in a computer readable storage 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), CD-ROM (Compact
Disc Read-Only Memory, CD-ROM) or other disk storages, magnetic disk storage, magnetic tape storage or can
Any other computer-readable medium for carrying or storing data.
Technical scheme of the present invention is described in detail above in association with attached drawing, it is contemplated that the fingerprint recognition proposed in the related technology
The technical issues of, the present invention proposes a kind of overvoltage crowbar, over-voltage protection method and over-pressure safety device, by using mistake
Voltage protection circuit controls the working condition pressure and initiation culture of compressor, solve compressor working condition pressure is excessively high and frequent starting
Problem.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, any made by repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of overvoltage crowbar is suitable for compressor, the overvoltage crowbar is equipped with contactless contactor and pressure switch,
The contactless contactor is set between the compressor and power supply source, and the pressure switch is connected to the contactless contactor, institute
It states when pressure switch detects the working condition pressure of the compressor more than or equal to preset pressure and disconnects, and then trigger the contact
Device switch disconnects, to control the compressor shutdown, which is characterized in that the overvoltage crowbar further includes：
Relay is connected in series with the contactless contactor and the pressure switch, and the relay touches when obtaining power on signal
It sends out contactless contactor described and is closed, to control the compressor operating；
Current sensor is connected to the contactless contactor, for detecting the current value for flowing through the compressor；
Control module, is connected to the relay, the pressure switch and the current sensor, and the pressure switch detects
When the working condition pressure is less than the preset pressure, the pressure switch is closed and generates corresponding closure signal；
After the control module obtains the closure signal, the duration for being zero according to the current value determines whether to generate institute
State power on signal.
2. overvoltage crowbar according to claim 1, which is characterized in that the control module includes：
Memory 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 memory, current sensor and the pressure switch, for anti-in the acquisition pressure switch
When the closure signal of feedback, judge whether the duration that the current value is zero is greater than or equal to duration threshold, and is sentencing
When the fixed duration is greater than or equal to the duration threshold, the power on signal is generated；
The comparator is additionally operable to：After generating the power on signal, the electricity of real-time storage described in the core dump memory clear is triggered
Flow valuve and the duration.
3. a kind of over-voltage protection method is suitable for overvoltage crowbar as claimed in claim 1 or 2, which is characterized in that described
Over-voltage protection method includes：
The working condition pressure of the compressor is detected in real time；
When detecting that the working condition pressure is greater than or equal to preset pressure, the compressor shutdown is controlled, is flowed through at this time described
The current value of compressor is zero；
When detecting that the working condition pressure is less than the preset pressure, corresponding closure signal is generated；
After receiving the closure signal, the duration for being zero according to the current value determines whether to generate power on signal,
Wherein, the power on signal is for controlling the compressor operating.
4. over-voltage protection method according to claim 3, which is characterized in that it is described after receiving the closure signal,
The duration for being zero according to the current value determines whether to generate power on signal, specifically include：
After receiving the closure signal, judge whether the duration that the current value is zero is greater than or equal to the duration
Threshold value；
When the duration for judging that the current value is zero being greater than or equal to the duration threshold, the upper telecommunications is generated
Number, to trigger the compressor operating.
5. over-voltage protection method according to claim 4, which is characterized in that further include：
Prestore the duration threshold；
Current value described in real-time storage, to count the duration that the current value is zero.
6. over-voltage protection method according to any one of claim 3 to 5, which is characterized in that further include：
After generating the power on signal, the duration that the current value is zero is removed.
7. a kind of over-pressure safety device is suitable for overvoltage crowbar as claimed in claim 1 or 2, which is characterized in that described
Over-pressure safety device includes：
Pressure sensing cell, the working condition pressure for detecting the compressor in real time；
Control unit, for when detecting that the working condition pressure is greater than or equal to preset pressure, controlling the compressor shutdown,
The current value for flowing through the compressor at this time is zero；
Generation unit, for when detecting that the working condition pressure is less than the preset pressure, generating corresponding closure signal；
Judging unit, for after receiving the closure signal, the duration for being zero according to the current value to determine whether
Power on signal is generated,
Wherein, the power on signal is for controlling the compressor operating.
8. over-pressure safety device according to claim 7, which is characterized in that
The judging unit is specifically used for：After receiving the closure signal, the duration that the current value is zero is judged
Whether duration threshold is greater than or equal to；
The generation unit is specifically additionally operable to：When the duration for judging that the current value is zero being greater than or equal to described continue
Between threshold value when, the power on signal is generated, to trigger the compressor operating.
9. over-pressure safety device according to claim 8, which is characterized in that further include：
Pre- memory cell, for the duration threshold that prestores；
Timing unit, for current value described in real-time storage, to count the duration that the current value is zero.
10. the over-pressure safety device according to any one of claim 7 to 9, which is characterized in that further include：
Clearing cell, for after generating the power on signal, removing the duration 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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| CN106684818B true CN106684818B (en) | 2018-11-13 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107084514B (en) * | 2017-06-26 | 2020-09-15 | 广东美的暖通设备有限公司 | Device for air conditioning system pressure protection and air conditioning system |
| 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 |
| CN111005862B (en) * | 2019-12-16 | 2022-02-15 | 广东美的暖通设备有限公司 | Pressure protection circuit, control method, and computer-readable storage medium |
| CN113472144B (en) * | 2021-08-09 | 2023-04-07 | 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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| CN105652774A (en) * | 2014-11-10 | 2016-06-08 | 中国船舶重工集团公司第七二三研究所 | Refrigeration device control system |
| CN105697349A (en) * | 2016-01-25 | 2016-06-22 | 中盐安徽润华盐业发展有限公司 | Air compressor electric control circuit for salt bag packing machine |
| CN106438320A (en) * | 2016-11-03 | 2017-02-22 | 广东美的暖通设备有限公司 | High-voltage protection system and method for compressor |
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| CN105652774A (en) * | 2014-11-10 | 2016-06-08 | 中国船舶重工集团公司第七二三研究所 | Refrigeration device control system |
| CN105697349A (en) * | 2016-01-25 | 2016-06-22 | 中盐安徽润华盐业发展有限公司 | Air compressor electric control circuit for salt bag packing machine |
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