CN109210765A - Electric heater and its fault detection means - Google Patents
Electric heater and its fault detection means Download PDFInfo
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- CN109210765A CN109210765A CN201710517189.5A CN201710517189A CN109210765A CN 109210765 A CN109210765 A CN 109210765A CN 201710517189 A CN201710517189 A CN 201710517189A CN 109210765 A CN109210765 A CN 109210765A
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- 238000001514 detection method Methods 0.000 title claims abstract description 159
- 238000010438 heat treatment Methods 0.000 claims abstract description 110
- 230000005611 electricity Effects 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000007689 inspection Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 8
- 235000013399 edible fruits Nutrition 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 206010037660 Pyrexia Diseases 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/0018—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters using electric energy supply
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2014—Arrangement or mounting of control or safety devices for water heaters using electrical energy supply
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Control Of Resistance Heating (AREA)
Abstract
The invention discloses a kind of electric heater and its fault detection means, the fault detection means includes: electric-leakage detection circuit, corresponding first conducting wire of electric-leakage detection circuit and the setting of the second conducting wire, electric-leakage detection circuit generate detection of electrical leakage signal when each heating circuit leaks electricity；Privates, privates are connected between one end of heating element and the first end of power supply；First switch and the second switch, first switch are connected on the first conducting wire, and second opens and be connected on privates；Control circuit, control circuit are connected with electric-leakage detection circuit, and control the disconnection and closure of first switch and the second switch.Fault detection means according to the present invention, can not only detect whether heating circuit occurs leak current fault, additionally it is possible to detect whether heating circuit occurs disconnection fault, cost is relatively low, small volume, and practicability is higher.
Description
Technical field
The present invention relates to field of home appliance technology, in particular to the fault detection means of a kind of electric heater and a kind of electricity
Water heater.
Background technique
When passing through the heating element heats water in electric heater, drunk whether through heating element heats water, still
By heating element heats water washing bath, user requires electricity consumption of taking care.If leak current fault or power-off occur for electric heater
Failure, then user needs to cut off power supply at once according to warning note, to prevent causing danger.But at present for electric hot water
Corresponding detection circuit need to be generally respectively set in the detection of the leak current fault and disconnection fault of device, so that higher cost, body
Product is larger, and practicability is lower.
Summary of the invention
The present invention is directed to solve one of the technical problem in above-mentioned technology at least to a certain extent.
For this purpose, can not only be examined an object of the present invention is to provide a kind of fault detection means of electric heater
Measure whether heating circuit occurs leak current fault, additionally it is possible to detect whether heating circuit occurs disconnection fault, cost is relatively low,
Small volume, practicability are higher.
Second object of the present invention is to propose a kind of electric heater.
In order to achieve the above objectives, first aspect present invention embodiment proposes a kind of fault detection means of electric heater,
The electric heater includes water storage liner and at least one heating circuit, wherein each heating circuit includes heating element, connection
The first conducting wire between one end of the heating element and the first end of power supply is connected to the another of the heating element
The second conducting wire between end and the second end of power supply, the fault detection means includes: electric-leakage detection circuit, the electric leakage
Detection circuit corresponds to first conducting wire and second conducting wire setting, and the electric-leakage detection circuit occurs in each heating circuit
Detection of electrical leakage signal is generated when electric leakage；Privates, the privates are connected to one end and the power supply electricity of the heating element
Between the first end in source；First switch and the second switch, the first switch are connected on first conducting wire, and described second opens
Pass is connected on the privates；Control circuit, the control circuit are connected with the electric-leakage detection circuit, and described in control
The disconnection and closure of first switch and the second switch, wherein disconnected in first switch closure, the second switch
When, if the control circuit receives the detection of electrical leakage signal, judge the heating circuit hair for corresponding to the first switch
Raw leak current fault；Disconnect in the first switch, the second switch closure when, if the control circuit do not receive it is described
Detection of electrical leakage signal then judges that disconnection fault occurs for the heating circuit for corresponding to the first switch.
The fault detection means of electric heater according to an embodiment of the present invention is heated back by electric-leakage detection circuit each
Detection of electrical leakage signal is generated when road is leaked electricity, and the disconnection and closure of first switch and the second switch are controlled by control circuit,
And when first switch closure, second switch disconnect, if control circuit receives detection of electrical leakage signal, corresponding first is judged
Leak current fault occurs for the heating circuit of switch；When first switch disconnects, second switch is closed, if control circuit does not receive
Detection of electrical leakage signal then judges that disconnection fault occurs for the heating circuit of corresponding first switch.The device, by utilizing an electric leakage
Detection circuit, can not only detect whether heating circuit occurs leak current fault, additionally it is possible to detect whether heating circuit occurs
Disconnection fault, therefore cost is relatively low, small volume, practicability is higher.
In addition, the fault detection means of the electric heater proposed according to that above embodiment of the present invention can also have it is following attached
The technical characteristic added:
According to an embodiment of the invention, the first switch and the second switch are disconnected and are closed periodically,
Wherein, when the first switch is closed, the second switch is disconnected, and when the first switch disconnects, the second switch is closed
It closes.
According to one embodiment of present invention, the power supply is mains supply, and the first end of the power supply is
Zero line, the second end of the power supply are zero line side.
According to one embodiment of present invention, the power supply be three-phase four-wire power, the first of the power supply
End is zero line side, and the second end of the power supply is any one phase line end, wherein each phase of the three-phase four-wire power
Line end is connected to one end of corresponding heat-generating pipe by corresponding first conducting wire, and the zero line side of the three-phase four-wire power leads to respectively
It crosses the second conducting wire and privates is connected to the other end of each heat-generating pipe.
According to one embodiment of present invention, the power supply be phase three-wire three power supply, the first of the power supply
The second end of end and the power supply is any two phase line end, wherein each phase line end of the phase three-wire three power supply is logical
One end that corresponding first conducting wire is connected to corresponding heat-generating pipe is crossed, any one phase line end of the phase three-wire three power supply passes through
Privates is connected to one end of corresponding heat-generating pipe, and the other end of each heat-generating pipe links together.
According to one embodiment of present invention, the electric-leakage detection circuit includes detection of electrical leakage coil.
According to one embodiment of present invention, the detection of electrical leakage coil be loop coil, wherein first conducting wire and
Second conducting wire is arranged within the inner circumferential side of the loop coil, and the outer of the loop coil is arranged in the privates
Except side.
According to one embodiment of present invention, the first switch or the second switch are relay, thyristor, IGBT
(Insulated Gate Bipolar Transistor, insulated gate bipolar transistor), MOSFET (Metal-Oxide-
Semiconductor Field-Effect Transistor, Metal-Oxide Semiconductor field effect transistor) in one.
In order to achieve the above objectives, second aspect of the present invention embodiment proposes a kind of electric heater comprising above-mentioned implementation
The fault detection means of the electric heater of example.
Electric heater according to an embodiment of the present invention is led to using the fault detection means of the electric heater of above-described embodiment
It crosses using an electric-leakage detection circuit, can not only detect whether heating circuit occurs leak current fault, additionally it is possible to detect to add
Whether hot loop occurs disconnection fault, therefore cost is relatively low, small volume, and practicability is higher.
Detailed description of the invention
Fig. 1 is the heating circuit of electric heater according to an embodiment of the present invention and the structural schematic diagram of fault detection means；
Fig. 2 is the flow chart of the fault detection method of electric heater according to an embodiment of the invention；
Fig. 3 is the structural schematic diagram of the fault detection means of electric heater according to an embodiment of the invention；
Fig. 4 is the fault detection means of electric heater according to an embodiment of the invention when carrying out leak current fault detection
Structural schematic diagram；
Fig. 5 is the fault detection means of electric heater according to an embodiment of the invention when carrying out disconnection fault detection
Structural schematic diagram；
Fig. 6 is the structural schematic diagram of the fault detection means of electric heater in accordance with another embodiment of the present invention；And
Fig. 7 is the block diagram of electric heater according to an embodiment of the present invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
The electric heater and its fault detection means of the embodiment of the present invention described with reference to the accompanying drawing.
Fig. 1 is the heating circuit of electric heater according to an embodiment of the present invention and the structural schematic diagram of fault detection means.
It should be noted that the fault detection means of the electric heater of the embodiment of the present invention can be applied to the electricity such as electric heater
In device.Wherein, electric heater may include water storage liner and at least one heating circuit.It may include heating unit in each heating circuit
The first conducting wire between part, the one end for being connected to heating element and the first end of power supply is connected to the another of heating element
The second conducting wire between end and the second end of power supply.
Fig. 1 is illustrated by taking a heating circuit as an example.Heating circuit may include heating element 10, the first conducting wire 20 and
Two conducting wires 30.Wherein, heating element 10 may include heat-generating pipe.
As shown in Figure 1, the fault detection means of the electric heater of the embodiment of the present invention may include electric-leakage detection circuit 40,
Three wires 50, first switch K1, second switch K2 and control circuit 60.
Wherein, corresponding first conducting wire 20 of electric-leakage detection circuit 40 and the setting of the second conducting wire 30, electric-leakage detection circuit 40 are adding
Detection of electrical leakage signal is generated when hot loop is leaked electricity.Privates 50 is connected to one end and the power supply 70 of heating element 10
First end between.First switch K1 is connected on the first conducting wire 20, and second switch K2 is connected on privates 50.Control electricity
Road 60 is connected with electric-leakage detection circuit 40, and controls the disconnection and closure of first switch K1 and second switch K2, in first switch
When K1 closure, second switch K2 are disconnected, if control circuit 60 receives detection of electrical leakage signal, corresponding first switch K1 is judged
Heating circuit occur leak current fault；When first switch K1 is disconnected, second switch K2 is closed, if control circuit 60 does not receive
To detection of electrical leakage signal, then judge that disconnection fault occurs for the heating circuit of corresponding first switch K1.
Specifically, power supply 70 can provide power supply for heating circuit.It is disconnected in first switch K1 closure, second switch K2
When, detection of electrical leakage signal can be generated when heating circuit leaks electricity by electric-leakage detection circuit 40, and by detection of electrical leakage signal
It is sent to control circuit 60.That is, can detect heating circuit by electric-leakage detection circuit 40 is in normal detection of electrical leakage
No generation leak current fault can determine whether the heating of corresponding first switch K1 if control circuit 60 receives detection of electrical leakage signal
Generation leak current fault in circuit can issue warning note such as red LED lamp by control circuit 60 in time and flash, can enter event
Hinder processing status；If control circuit 60 does not receive detection of electrical leakage signal, it can determine whether that the heating of corresponding first switch K1 is returned
Road is in the state worked normally.
Further, whether the fault detection means of the electric heater of the embodiment of the present invention is in addition to being able to detect heating circuit
Occur except leak current fault, additionally it is possible to detect whether heating circuit occurs disconnection fault.
It specifically, can be by electric-leakage detection circuit 40 by second when first switch K1 is disconnected, second switch K2 is closed
Detection of electrical leakage signal is generated when the heating circuit that conducting wire 30, heating element 10 and privates 50 are constituted works normally.And it is supplying
In the power-off of power supply 70 or heating circuit whens corresponding damage of heating element 10 etc., leakage can not be generated by electric-leakage detection circuit 40
Power detection signal.Therefore, the detection of electrical leakage signal of generation can be sent to control circuit 60 by electric-leakage detection circuit 40, pass through judgement
Whether control circuit 60 receives detection of electrical leakage signal, to judge 50 place of the second conducting wire 30, heating element 10 and privates
Heating circuit whether disconnection fault occurs.That is, electric-leakage detection circuit 40 can be passed through when actively manufacturing detection of electrical leakage
Whether detection heating circuit occurs disconnection fault, if control circuit 60 receives detection of electrical leakage signal, can determine whether corresponding the
The heating circuit of one switch K1 is in the state worked normally；If control circuit 60 does not receive detection of electrical leakage signal, can
Judge that disconnection fault occurs for the heating circuit of corresponding first switch K1, warning note can be issued such as by control circuit 60 in time
Yellow LED lamp flashing, and enter troubleshooting state.
In one embodiment of the invention, as shown in Figure 1, electric-leakage detection circuit 40 may include detection of electrical leakage coil.Its
In, detection of electrical leakage coil can be loop coil, the first conducting wire 20 and the second conducting wire 30 may be provided at loop coil inner circumferential side it
Interior, privates 50 may be provided at except the peripheral side of loop coil.
It is appreciated that being if flowing in and out the operating current of detection of electrical leakage coil in the work of detection of electrical leakage coil
Equal in magnitude and contrary, sum of zero, then the magnetic flux of detection of electrical leakage coil induction is zero, without leakage in detection of electrical leakage coil
Electric current generates.If the operating current for flowing in and out detection of electrical leakage coil is direction not of uniform size and on the contrary, summation is not
Zero, then detection of electrical leakage coil generates variable magnetic field, and the magnetic flux incuded is not zero, and has electric leakage to miscarry in detection of electrical leakage coil
It is raw.Therefore, the leakage current that electric-leakage detection circuit 40 can will test is as detection of electrical leakage signal.
It should be noted that the detection time of the leak current fault of electric-leakage detection circuit 40 is no less than 0.1 second, for electric hot water
For device, during heating circuit heating, there is abnormal heating in 0.1 second once in a while, have no effect on heating circuit and water is heated.
In one embodiment of the invention, first switch K1 or second switch K2 can for relay, thyristor, IGBT,
One in MOSFET.First switch K1 and second switch K2 can be disconnected and be closed periodically, wherein the period can be according to practical feelings
Condition is set, such as the period can be 1 second.In first switch K1 closure, second switch K2 is disconnected, and whether detection heating circuit
The time that leak current fault occurs can be 0.9 second, and when first switch K1 is disconnected, second switch K2 closure, detecting heating circuit is
The no time that disconnection fault occurs can be 0.1 second.
In order to enable those skilled in the art clearly understand the present invention, as shown in Fig. 2, being the electricity in 1 second in the period
The fault detection method of water heater can comprise the following steps that
S201, control circuit controls first switch K1 closure, second switch K2 is disconnected, and carries out detection of electrical leakage.
S202, judges whether control circuit issues warning note.If so, leak current fault occurs for heating circuit, step is executed
Rapid S205；If not, heating circuit is in the state worked normally, step S203 is executed.
S203, control circuit control first switch K1 disconnection, second switch K2 closure, carry out outage detection.
S204, judges whether control circuit issues warning note.If so, heating circuit is in the state worked normally,
Return step S201；If not, disconnection fault occurs for heating circuit, step S205 is executed.
S205, the leak current fault or disconnection fault that processing heating circuit occurs.
In one embodiment of the invention, power supply 70 can be mains supply, and the first end of power supply 70 can be
Zero line, the second end of power supply 70 can be zero line side.
In one embodiment of the invention, power supply 70 can also be phase three-wire three power supply or three-phase four-wire power.When
When power supply 70 is phase three-wire three power supply or three-phase four-wire power, disconnection fault may include that open-phase fault and heating circuit are corresponding
Heating element damage failure.
In one embodiment of the invention, when power supply 70 is three-phase four-wire power, as shown in figure 3, power supply electricity
The first end in source 70 can be zero line side (i.e. N-terminal), and the second end of power supply 70 can be any one phase line end (such as end L1),
In, each phase line end (i.e. the end L1, the end L2 and the end L3) of three-phase four-wire power is connected to corresponding by corresponding first conducting wire
The zero line side of one end of heat-generating pipe, three-phase four-wire power can be connected to each hair by the second conducting wire 30 and privates 50 respectively
The other end of heat pipe.
It is appreciated that three-phase four-wire power can power for the heat-generating pipe being correspondingly connected with each phase line end, electric heater can
Including three heating circuits, each heating circuit may include the first conducting wire, the second conducting wire 30 and heat-generating pipe.Wherein, the first conducting wire
It is connected to any one phase line end (i.e. the end L1, the end L2 and the end L3), the second conducting wire 30 is connected to zero line side (i.e. N-terminal) and fever
Pipe is connected between zero line side and any one phase line end.The fault detection means of electric heater may include electric-leakage detection circuit
40, privates 50, first switch (can be K1, K3, K4 or K5), second switch K2 and control circuit 60.
K1-K5 can be intelligently controlled by control circuit 60 to disconnect and be closed periodically to carry out detection of electrical leakage and power-off inspection
It surveys.Wherein, the period of the detection of electrical leakage and outage detection of entire circuit can be 3 seconds, and zero line side is connected with any one phase line end
Heat-generating pipe detection of electrical leakage and outage detection total time be 1 second.
In order to guarantee the security performance of electric heater, can periodic detection electric heater whether break down, failure may include
Whether heating circuit occurs leak current fault and disconnection fault.
Firstly, can intelligently be controlled by control circuit 60 K1 closure, K2 disconnect, K3 closure, K4 closure and K5 closure with
Detect whether all heating circuits occur leak current fault.If control circuit 60 does not receive detection of electrical leakage signal, can sentence
The corresponding heat-generating pipe of all heating circuits that breaks is in the state worked normally.If control circuit 60 receives detection of electrical leakage letter
Number, then it can determine whether that leak current fault occurs for the corresponding heat-generating pipe of at least one heating circuit.
It then, can be to each heating in order to specifically detect that leak current fault occurs for the corresponding heat-generating pipe of which heating circuit
Circuit carries out detection of electrical leakage one by one.Wherein, the detection of electrical leakage of zero line side heating circuit corresponding with any one phase line end when
Between can be 0.9 second.
For example, as shown in figure 4, K2 disconnection, K1 closure, K3 disconnection, K4 can intelligently be controlled by control circuit 60
Closure and K5 are disconnected.If control circuit 60 receives detection of electrical leakage signal, the heating circuit where can determine whether K4 is corresponding
Heat-generating pipe occur leak current fault.If control circuit 60 does not receive detection of electrical leakage signal, the heating where K4 can determine whether
The corresponding heat-generating pipe in circuit is in the state worked normally.
After detection of electrical leakage, can intelligently be controlled by control circuit 60 K1 disconnect, K2 closure, K3-K5 one of them close
It closes to detect whether the heating circuit where the switch being closed in K3-K5 occurs disconnection fault.Wherein, zero line side and any one
The outage detection time of the corresponding heating circuit of phase line end can be 0.1 second.
For example, as shown in figure 5, K2 closure can intelligently be controlled by control circuit 60, K1 is disconnected, K3 closure, K4
It disconnects and K5 is disconnected.If control circuit 60 receives detection of electrical leakage signal, the heating circuit where can determine whether K3 is corresponding
Heat-generating pipe and power supply 70 be in work normally state.If control circuit 60 does not receive detection of electrical leakage signal,
The corresponding heat-generating pipe of heating circuit where can determine whether the end L1 open-phase fault and/or K3 is damaged.
In one embodiment of the invention, when power supply is phase three-wire three power supply, as shown in fig. 6, power supply
70 first end (such as end L1), the second end of power supply 70 are any two phase line end (such as end L2 or the end L3).Wherein, three-phase
Each phase line end (such as the end L1, the end L2 and the end L3) of three line power supplys is connected to corresponding heat-generating pipe by corresponding first conducting wire
One end, any one phase line end of phase three-wire three power supply are connected to one end of corresponding heat-generating pipe by privates 50, each
The other end of heat-generating pipe links together.
It is appreciated that phase three-wire three power supply can wrap for the heat-generating pipe power supply that each phase line end is correspondingly connected with, electric heater
Include three heating circuits.For example, can be led by being connected to first conducting wire at the end phase line end L1, being connected to the first of the end phase line end L2
Heat-generating pipe corresponding to line, the K1 being connected on the first conducting wire, heat-generating pipe corresponding to the K3 being connected on the first conducting wire are constituted
One heating circuit.It can be by being connected to first conducting wire at the end phase line end L1, the first conducting wire for being connected to the end phase line end L2, being connected to
Heat-generating pipe corresponding to K1 on first conducting wire, heat-generating pipe corresponding to the K4 being connected on the first conducting wire constitute one and heat back
Road.It can be by being connected to first conducting wire at the end phase line end L2, the first conducting wire for being connected to the end phase line end L3, being connected on the first conducting wire
K3 corresponding to heat-generating pipe, heat-generating pipe constitutes a heating circuit corresponding to the K4 that is connected on the first conducting wire.Electric hot water
The fault detection means of device may include electric-leakage detection circuit 40, privates 50, first switch (can be K1, K3 and K4), second
Switch K2 and control circuit 60.
K1-K4 can be intelligently controlled by control circuit 60 to disconnect and be closed periodically to carry out detection of electrical leakage and power-off inspection
It surveys.Wherein, the period of the detection of electrical leakage and outage detection of entire circuit can be 3 seconds, the hair that any two phase line end is correspondingly connected with
The detection of electrical leakage of heat pipe and the total time of outage detection are 1 second.
In order to guarantee the security performance of electric heater, can periodic detection electric heater whether break down, failure may include
Whether heating circuit occurs leak current fault and disconnection fault.
Firstly, detecting whether all heating circuits occur leak current fault, K1 can be intelligently controlled by control circuit 60
Closure, K2 are disconnected, K3 closure and K4 are closed.If control circuit 60 does not receive detection of electrical leakage signal, can determine whether all
The corresponding heat-generating pipe of heating circuit is in the state of normal work.If detection circuit 60 receives detection of electrical leakage signal,
It can determine whether that leak current fault occurs for the corresponding heat-generating pipe of at least one heating circuit.
It then, can be to each heating in order to specifically detect that leak current fault occurs for the corresponding heat-generating pipe of which heating circuit
Circuit carries out detection of electrical leakage.Wherein, the time of the detection of electrical leakage of the corresponding heating circuit of any two phase line end can be 0.9
Second.
For example, K2 disconnection, K1 closure, K3 closure and K4 can be intelligently controlled by control circuit 60 to disconnect.Such as
Fruit control circuit 60 receives detection of electrical leakage signal, then the heating circuit where can determine whether K1 and K3 it is corresponding at least one
Leak current fault occurs for heat-generating pipe.If control circuit 60 does not receive detection of electrical leakage signal, can determine whether it is where K1 and K3 plus
The corresponding heat-generating pipe of hot loop is in the state of normal work.
After detection of electrical leakage, can intelligently be controlled by control circuit 60 K1 disconnect, K2 closure, K3-K4 one of them close
It closes to detect whether the heating circuit where the switch being closed in K3-K4 occurs disconnection fault.Wherein, any two phase line end pair
The time of the outage detection for the heating circuit answered is 0.1 second.
For example, K2 closure can be intelligently controlled by control circuit 60, K1 is disconnected, K3 is disconnected and K4 closure.Such as
Fruit control circuit 60 receives detection of electrical leakage signal, then the corresponding heat-generating pipe of the heating circuit where can determine whether K1 and K4 is in
The state of normal work.If control circuit 60 does not receive detection of electrical leakage signal, the end L1 and/or the event of the end L3 phase shortage can determine whether
Barrier and/or K1 and K4 where at least one corresponding heat-generating pipe of heating circuit be damaged.
In conclusion the fault detection means of electric heater according to an embodiment of the present invention, is existed by electric-leakage detection circuit
Detection of electrical leakage signal is generated when each heating circuit leaks electricity, and the disconnected of first switch and the second switch is controlled by control circuit
Open and close are closed, and when first switch closure, second switch disconnect, if control circuit receives detection of electrical leakage signal, are sentenced
Leak current fault occurs for the heating circuit of disconnected corresponding first switch；When first switch disconnects, second switch is closed, if control electricity
Road does not receive detection of electrical leakage signal, then judges that disconnection fault occurs for the heating circuit of corresponding first switch.The device passes through benefit
With an electric-leakage detection circuit, it can not only detect whether heating circuit occurs leak current fault, additionally it is possible to detect to heat back
Whether road occurs disconnection fault, therefore cost is relatively low, small volume, and practicability is higher.
Based on the above embodiment, the invention also provides a kind of electric heaters 1000.
Fig. 7 is the block diagram of electric heater according to an embodiment of the present invention.As shown in fig. 7, the embodiment of the present invention
Electric heater 1000 includes the fault detection means 100 of the electric heater of above-described embodiment.
It should be noted that the undisclosed details in the electric heater 1000 of the embodiment of the present invention, please refers to the present invention
Details disclosed in the fault detection means 100 of the electric heater of embodiment, specific I will not elaborate.
Electric heater according to an embodiment of the present invention is led to using the fault detection means of the electric heater of above-described embodiment
It crosses using an electric-leakage detection circuit, can not only detect whether heating circuit occurs leak current fault, additionally it is possible to detect to add
Whether hot loop occurs disconnection fault, therefore cost is relatively low, small volume, and practicability is higher.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on the figure or
Positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must
There must be specific orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more of the features.In the description of the present invention, the meaning of " plurality " is two or more,
Unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements.It for the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (9)
1. a kind of fault detection means of electric heater, which is characterized in that the electric heater includes water storage liner and at least one
A heating circuit, wherein each heating circuit includes heating element, the one end for being connected to the heating element and power supply
The first conducting wire between first end, second be connected between the other end of the heating element and the second end of power supply are led
Line, the fault detection means include:
Electric-leakage detection circuit, the electric-leakage detection circuit correspond to first conducting wire and second conducting wire setting, the electric leakage
Detection circuit generates detection of electrical leakage signal when each heating circuit leaks electricity；
Privates, the privates are connected between one end of the heating element and the first end of power supply；
First switch and the second switch, the first switch are connected on first conducting wire, and the second switch is connected to institute
It states on privates；
Control circuit, the control circuit are connected with the electric-leakage detection circuit, and control the first switch and described second
The disconnection and closure of switch, wherein
When first switch closure, the second switch disconnect, if the control circuit receives the detection of electrical leakage
Signal then judges that leak current fault occurs for the heating circuit for corresponding to the first switch；
When the first switch disconnects, the second switch is closed, if the control circuit does not receive the electric leakage inspection
Signal is surveyed, then judges that disconnection fault occurs for the heating circuit for corresponding to the first switch.
2. the fault detection means of electric heater according to claim 1, which is characterized in that the first switch and described
Second switch is disconnected and is closed periodically, wherein in first switch closure, the second switch is disconnected, described first
Switch second switch closure when disconnecting.
3. the fault detection means of electric heater according to claim 2, which is characterized in that wherein, the power supply
For mains supply, the first end of the power supply is zero line, and the second end of the power supply is zero line side.
4. the fault detection means of electric heater according to claim 2, which is characterized in that wherein, the power supply
For three-phase four-wire power, the first end of the power supply is zero line side, and the second end of the power supply is any one phase
Line end, wherein each phase line end of the three-phase four-wire power is connected to corresponding heat-generating pipe by corresponding first conducting wire
One end, the zero line side of the three-phase four-wire power passes through the second conducting wire respectively and privates is connected to the another of each heat-generating pipe
End.
5. the fault detection means of electric heater according to claim 2, which is characterized in that wherein, the power supply
For phase three-wire three power supply, the second end of the first end of the power supply and the power supply is any two phase line end,
In, each phase line end of the phase three-wire three power supply is connected to one end of corresponding heat-generating pipe, institute by corresponding first conducting wire
Any one the phase line end for stating phase three-wire three power supply is connected to one end of corresponding heat-generating pipe, each heat-generating pipe by privates
The other end link together.
6. the fault detection means of electric heater according to any one of claims 1-5, which is characterized in that the electric leakage
Detection circuit includes detection of electrical leakage coil.
7. the fault detection means of electric heater according to claim 6, which is characterized in that the detection of electrical leakage coil is
Loop coil, wherein first conducting wire and second conducting wire are arranged within the inner circumferential side of the loop coil, and described
Three wires are arranged in except the peripheral side of the loop coil.
8. the fault detection means of electric heater according to any one of claims 1-5, which is characterized in that described first
Switch or the second switch are relay, thyristor, one in IGBT, MOSFET.
9. a kind of electric heater, which is characterized in that the failure including electric heater according to claim 1 to 8
Detection device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710517189.5A CN109210765B (en) | 2017-06-29 | 2017-06-29 | Electric water heater and fault detection device thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710517189.5A CN109210765B (en) | 2017-06-29 | 2017-06-29 | Electric water heater and fault detection device thereof |
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| CN109210765A true CN109210765A (en) | 2019-01-15 |
| CN109210765B CN109210765B (en) | 2024-04-16 |
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| CN109210765B (en) | 2024-04-16 |
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