CN109210765B - Electric water heater and fault detection device thereof - Google Patents
Electric water heater and fault detection device thereof Download PDFInfo
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- CN109210765B CN109210765B CN201710517189.5A CN201710517189A CN109210765B CN 109210765 B CN109210765 B CN 109210765B CN 201710517189 A CN201710517189 A CN 201710517189A CN 109210765 B CN109210765 B CN 109210765B
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- 238000001514 detection method Methods 0.000 title claims abstract description 149
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 238000010438 heat treatment Methods 0.000 claims abstract description 156
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 239000004020 conductor Substances 0.000 claims description 4
- 238000003860 storage Methods 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 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
- 239000004065 semiconductor Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000003287 bathing Methods 0.000 description 1
- 230000035622 drinking Effects 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 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
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- 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
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- 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
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- 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)
- Control Of Resistance Heating (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses an electric water heater and a fault detection device thereof, wherein the fault detection device comprises: the leakage detection circuit is arranged corresponding to the first wire and the second wire and generates a leakage detection signal when each heating loop generates leakage; a third wire connected between one end of the heating element and the first end of the power supply; the first switch is connected to the first guide wire, and the second switch is connected to the third guide wire; and the control circuit is connected with the electric leakage detection circuit and controls the opening and closing of the first switch and the second switch. According to the fault detection device provided by the invention, whether the heating circuit has an electric leakage fault or not can be detected, whether the heating circuit has an electric failure or not can also be detected, the cost is lower, the size is smaller, and the practicability is higher.
Description
Technical Field
The invention relates to the technical field of household appliances, in particular to a fault detection device of an electric water heater and the electric water heater.
Background
When heating water by the heating element in the electric water heater, users need to pay attention to safe electricity consumption whether the water is heated by the heating element for drinking or the heating element for bathing. If the electric water heater has electric leakage fault or power failure, the user needs to cut off the power supply immediately according to the alarm prompt so as to prevent danger. However, at present, detection of the leakage fault and the power failure of the electric water heater generally needs to be respectively provided with corresponding detection circuits, so that the cost is higher, the volume is larger, and the practicability is lower.
Disclosure of Invention
The present invention aims to solve at least to some extent one of the technical problems in the above-described technology.
Therefore, an object of the present invention is to provide a fault detection device for an electric water heater, which can detect whether the heating circuit has an electric leakage fault or not, and can detect whether the heating circuit has an electric power failure or not, and has the advantages of low cost, small volume and high practicability.
A second object of the present invention is to provide an electric water heater.
To achieve the above object, an embodiment of the present invention provides a fault detection device for an electric water heater, the electric water heater including a water storage liner and at least one heating circuit, wherein each heating circuit includes a heating element, a first wire connected between one end of the heating element and a first end of a power supply, and a second wire connected between the other end of the heating element and a second end of the power supply, the fault detection device includes: the leakage detection circuit is arranged corresponding to the first wire and the second wire, and generates a leakage detection signal when each heating loop generates leakage; a third wire connected between one end of the heating element and a first end of a power supply; a first switch and a second switch, the first switch being connected to the first conductor, the second switch being connected to the third conductor; the control circuit is connected with the leakage detection circuit and controls the opening and closing of the first switch and the second switch, wherein when the first switch is closed and the second switch is opened, if the control circuit receives the leakage detection signal, the heating circuit corresponding to the first switch is judged to have leakage faults; when the first switch is opened and the second switch is closed, if the control circuit does not receive the electric leakage detection signal, judging that the heating loop corresponding to the first switch has power failure.
According to the fault detection device of the electric water heater, disclosed by the embodiment of the invention, the electric leakage detection circuit is used for generating an electric leakage detection signal when each heating loop is in electric leakage, the control circuit is used for controlling the opening and closing of the first switch and the second switch, and when the first switch is closed and the second switch is opened, if the control circuit receives the electric leakage detection signal, the heating loop corresponding to the first switch is judged to have an electric leakage fault; when the first switch is opened and the second switch is closed, if the control circuit does not receive the electric leakage detection signal, the heating loop corresponding to the first switch is judged to have power failure. The device not only can detect whether the heating circuit has leakage faults or not by utilizing the leakage detection circuit, but also can detect whether the heating circuit has power failure or not, so that the device is low in cost, small in size and high in practicality.
In addition, the fault detection device of the electric water heater according to the embodiment of the invention may further have the following additional technical features:
according to one embodiment of the invention, the first switch and the second switch are opened and closed periodically, wherein the second switch is opened when the first switch is closed and the second switch is closed when the first switch is opened.
According to one embodiment of the invention, the power supply is a mains power supply, the first end of the power supply is a live end, and the second end of the power supply is a zero line end.
According to one embodiment of the invention, the power supply is a three-phase four-wire power supply, the first end of the power supply is a zero line end, 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 supply is connected to one end of a corresponding heating tube through a corresponding first wire, and the zero line end of the three-phase four-wire power supply is connected to the other end of each heating tube through a second wire and a third wire respectively.
According to one embodiment of the invention, the power supply is a three-phase three-wire power supply, the first end of the power supply and the second end of the power supply are any two phase wire ends, wherein each phase wire end of the three-phase three-wire power supply is connected to one end of a corresponding heating tube through a corresponding first wire, any phase wire end of the three-phase three-wire power supply is connected to one end of the corresponding heating tube through a third wire, and the other ends of the heating tubes are connected together.
In accordance with one embodiment of the present invention, the leakage detection circuit includes a leakage detection coil.
According to an embodiment of the present invention, the leakage detection coil is a loop coil, wherein the first wire and the second wire are disposed inside an inner peripheral side of the loop coil, and the third wire is disposed outside an outer peripheral side of the loop coil.
According to one embodiment of the invention, the first switch or the second switch is one of a relay, a thyristor, an IGBT (Insulated Gate Bipolar Transistor ), a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor, metal-Oxide semiconductor field effect transistor).
In order to achieve the above object, a second aspect of the present invention provides an electric water heater, which includes the fault detection device of the electric water heater of the above embodiment.
According to the electric water heater provided by the embodiment of the invention, the fault detection device of the electric water heater provided by the embodiment of the invention can detect whether the heating circuit has an electric leakage fault or not by utilizing the electric leakage detection circuit, and can detect whether the heating circuit has an outage fault or not, so that the electric water heater is low in cost, small in size and high in practicability.
Drawings
Fig. 1 is a schematic structural view of a heating circuit and a fault detection device of an electric water heater according to an embodiment of the present invention;
fig. 2 is a flowchart of a fault detection method of an electric water heater according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a fault detection device of an electric water heater according to an embodiment of the present invention;
fig. 4 is a schematic structural view of a fault detection device of an electric water heater according to an embodiment of the present invention when detecting an electric leakage fault;
fig. 5 is a schematic view of a fault detection device of an electric water heater according to an embodiment of the present invention when performing power failure detection;
fig. 6 is a schematic structural view of a fault detection device of an electric water heater according to another embodiment of the present invention; and
fig. 7 is a block schematic diagram of an electric water heater according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The following describes an electric water heater and a fault detection device thereof according to an embodiment of the present invention with reference to the accompanying drawings.
Fig. 1 is a schematic structural view of a heating circuit and a fault detection device of an electric water heater according to an embodiment of the present invention.
It should be noted that the fault detection device of the electric water heater according to the embodiment of the invention can be applied to electric appliances such as electric water heaters. Wherein, electric water heater can include water storage inner bag and at least one heating circuit. Each heating circuit may include a heating element, a first wire connected between one end of the heating element and a first end of the power supply, and a second wire connected between the other end of the heating element and a second end of the power supply.
Fig. 1 illustrates an example of a heating circuit. The heating circuit may include a heating element 10, a first wire 20, and a second wire 30. Wherein the heating element 10 may comprise a heating tube.
As shown in fig. 1, the fault detection device of the electric water heater according to the embodiment of the present invention may include a leakage detection circuit 40, a third wire 50, a first switch K1, a second switch K2, and a control circuit 60.
The leakage detection circuit 40 is disposed corresponding to the first conductive line 20 and the second conductive line 30, and the leakage detection circuit 40 generates a leakage detection signal when a leakage occurs in the heating circuit. The third wire 50 is connected between one end of the heating element 10 and a first end of the power supply 70. The first switch K1 is connected to the first wire 20, and the second switch K2 is connected to the third wire 50. The control circuit 60 is connected with the electric leakage detection circuit 40, and controls the opening and closing of the first switch K1 and the second switch K2, and when the first switch K1 is closed and the second switch K2 is opened, if the control circuit 60 receives an electric leakage detection signal, the heating circuit corresponding to the first switch K1 is judged to have electric leakage fault; when the first switch K1 is turned off and the second switch K2 is turned on, if the control circuit 60 does not receive the leakage detection signal, it is determined that the heating circuit corresponding to the first switch K1 has a power failure.
In particular, the method comprises the steps of, the power supply 70 may provide power to the heating circuit. When the first switch K1 is closed and the second switch K2 is opened, the leakage detection circuit 40 generates a leakage detection signal when a leakage occurs in the heating circuit, and sends the leakage detection signal to the control circuit 60. That is, in the normal leakage detection, the leakage detection circuit 40 can detect whether the heating circuit has a leakage fault, if the control circuit 60 receives the leakage detection signal, it can determine that the heating circuit corresponding to the first switch K1 has a leakage fault, that is, the control circuit 60 can timely send an alarm prompt such as flashing red LED lamp, and can enter a fault processing state; if the control circuit 60 does not receive the leakage detection signal, it may determine that the heating circuit corresponding to the first switch K1 is in a normal operating state.
Furthermore, the fault detection device of the electric water heater provided by the embodiment of the invention can detect whether the heating circuit has a power failure or not besides detecting whether the heating circuit has a leakage fault or not.
Specifically, when the first switch K1 is turned off and the second switch K2 is turned on, the leakage detection signal may be generated by the leakage detection circuit 40 when the heating circuit constituted by the second wire 30, the heating element 10, and the third wire 50 is operating normally. And when the power supply 70 is powered off or the corresponding heating element 10 in the heating circuit is damaged or the like, the leakage detection signal may not be generated by the leakage detection circuit 40. Therefore, the leakage detection circuit 40 may send the generated leakage detection signal to the control circuit 60, and determine whether the heating circuit where the second wire 30, the heating element 10 and the third wire 50 are located has a power failure by determining whether the control circuit 60 receives the leakage detection signal. That is, in the active manufacturing leakage detection, whether the heating circuit is in a power failure or not can be detected by the leakage detection circuit 40, and if the control circuit 60 receives the leakage detection signal, it can be determined that the heating circuit corresponding to the first switch K1 is in a normal working state; if the control circuit 60 does not receive the leakage detection signal, it can determine that the heating circuit corresponding to the first switch K1 has a power failure, and can timely send an alarm prompt such as flashing yellow LED lamp through the control circuit 60 and enter a failure processing state.
In one embodiment of the present invention, as shown in FIG. 1, the leakage detection circuit 40 may include a leakage detection coil. Wherein the leakage detection coil may be a loop coil, the first and second wires 20 and 30 may be disposed inside an inner peripheral side of the loop coil, and the third wire 50 may be disposed outside an outer peripheral side of the loop coil.
It can be understood that when the leakage detection coil works, if the working currents flowing into and out of the leakage detection coil are equal in magnitude and opposite in direction, and the sum is zero, the magnetic flux induced by the leakage detection coil is zero, and no leakage current is generated in the leakage detection coil. If the working currents flowing into and out of the leakage detection coil are in different directions and are opposite, and the sum is not zero, the leakage detection coil generates a variable magnetic field, the induced magnetic flux is not zero, and leakage current is generated in the leakage detection coil. Accordingly, the leakage current detection circuit 40 can take the detected leakage current as a leakage current detection signal.
It should be noted that, the detection time of the leakage fault of the leakage detection circuit 40 is not less than 0.1 seconds, and in the electric water heater, during the heating process of the heating circuit, abnormal heating is occasionally performed for 0.1 seconds, so that the heating circuit is not affected to heat the water.
In one embodiment of the invention, the first switch K1 or the second switch K2 may be one of a relay, a thyristor, an IGBT, a MOSFET. The first switch K1 and the second switch K2 may be opened and closed periodically, wherein the period may be set according to the actual situation, for example, the period may be 1 second. When the first switch K1 is closed, the second switch K2 is opened, the time for detecting whether the heating circuit has a leakage fault may be 0.9 seconds, when the first switch K1 is opened, the second switch K2 is closed, and the time for detecting whether the power failure occurs in the heating circuit may be 0.1 seconds.
In order to make the present invention more clearly understood by those skilled in the art, as shown in fig. 2, the fault detection method of the electric water heater within 1 second period may include the following steps:
s201, the control circuit controls the first switch K1 to be closed and the second switch K2 to be opened, so that leakage detection is performed.
S202, judging whether the control circuit gives out an alarm prompt. If yes, the heating loop suffers from leakage fault, and step S205 is executed; if not, the heating circuit is in a normal operation state, and step S203 is performed.
S203, the control circuit controls the first switch K1 to be opened and the second switch K2 to be closed, so that power-off detection is performed.
S204, judging whether the control circuit gives out an alarm prompt. If yes, the heating loop is in a normal working state, and the step S201 is returned to; if not, the heating circuit fails, and step S205 is performed.
S205, the leakage fault or the power failure of the heating loop is processed.
In one embodiment of the invention, the power supply 70 may be a mains power supply, the first end of the power supply 70 may be a hot end, and the second end of the power supply 70 may be a neutral end.
In one embodiment of the present invention, the power supply 70 may also be a three-phase three-wire power supply or a three-phase four-wire power supply. When the power supply 70 is a three-phase three-wire power supply or a three-phase four-wire power supply, the power failure may include a phase loss failure and a heating element damage failure corresponding to the heating circuit.
In one embodiment of the present invention, when the power supply 70 is a three-phase four-wire power supply, as shown in fig. 3, the first end of the power supply 70 may be a neutral end (i.e., an N-end), and the second end of the power supply 70 may be any one phase end (i.e., an L1-end), wherein each phase end (i.e., an L1-end, an L2-end, and an L3-end) of the three-phase four-wire power supply is connected to one end of a corresponding heating tube through a corresponding first wire, and the neutral end of the three-phase four-wire power supply may be connected to the other end of each heating tube through the second wire 30 and the third wire 50, respectively.
It will be appreciated that a three-phase four-wire power supply may provide power to the heat pipes correspondingly connected to each phase wire end, and that an electric water heater may include three heating loops, each of which may include a first wire, a second wire 30, and a heat pipe. Wherein the first wire is connected to any one of the phase wire ends (i.e., L1 end, L2 end and L3 end), the second wire 30 is connected to the neutral wire end (i.e., N end), and the heating tube is connected between the neutral wire end and any one of the phase wire ends. The fault detection device of the electric water heater may include a leakage detection circuit 40, a third wire 50, a first switch (K1, K3, K4 or K5), a second switch K2 and a control circuit 60.
K1-K5 may be intelligently controlled to open and close periodically by control circuit 60 for leakage detection and power outage detection. The period of the electric leakage detection and the power failure detection of the whole circuit can be 3 seconds, and the total time of the electric leakage detection and the power failure detection of the heating tube connected with the zero line end and any phase line end is 1 second.
To ensure the safety performance of the electric water heater, whether the electric water heater has faults or not can be detected periodically, and the faults can comprise whether the heating circuit has leakage faults or not and power failure faults or not.
First, K1 closed, K2 open, K3 closed, K4 closed, and K5 closed may be intelligently controlled by the control circuit 60 to detect whether all heating circuits are experiencing a leakage fault. If the control circuit 60 does not receive the leakage detection signal, it can determine that all the heating tubes corresponding to the heating circuits are in a normal working state. If the control circuit 60 receives the leakage detection signal, it can determine that the heating tube corresponding to at least one heating circuit has a leakage fault.
Then, in order to specifically detect which heating circuit corresponds to the heating tube that has a leakage failure, the leakage detection may be performed for each heating circuit one by one. The leakage detection time of the heating loop corresponding to the zero line end and any phase line end can be 0.9 seconds.
For example, as shown in fig. 4, K2 open, K1 closed, K3 open, K4 closed, and K5 open may be intelligently controlled by control circuitry 60. If the control circuit 60 receives the leakage detection signal, it can determine that the heating tube corresponding to the heating circuit where K4 is located has a leakage fault. If the control circuit 60 does not receive the leakage detection signal, it can be determined that the heating tube corresponding to the heating circuit where K4 is located is in a normal working state.
After the leakage detection, the control circuit 60 can intelligently control the opening of K1, the closing of K2 and the closing of one of K3-K5 to detect whether the heating circuit where the closed switch in K3-K5 is located has a power failure. The power-off detection time of the heating loop corresponding to the zero line end and any phase line end can be 0.1 second.
For example, as shown in fig. 5, K2 closed, K1 open, K3 closed, K4 open, and K5 open may be intelligently controlled by control circuitry 60. If the control circuit 60 receives the leakage detection signal, it can determine that the heating tube corresponding to the heating circuit where K3 is located and the power supply 70 are in a normal working state. If the control circuit 60 does not receive the leakage detection signal, it may determine that the L1 end phase failure and/or the heating tube corresponding to the heating loop where K3 is located is damaged.
In one embodiment of the present invention, when the power supply is a three-phase three-wire power supply, as shown in fig. 6, the first end (e.g., the L1 end) of the power supply 70, and the second end of the power supply 70 is any two phase wire ends (e.g., the L2 end or the L3 end). Wherein, each phase line end (such as L1 end, L2 end and L3 end) of the three-phase three-wire power supply is connected to one end of the corresponding heating tube through the corresponding first wire, any phase line end of the three-phase three-wire power supply is connected to one end of the corresponding heating tube through the third wire 50, and the other end of each heating tube is connected together.
It is understood that the three-phase three-wire power supply can supply power to the heating tube correspondingly connected with each phase wire end, and the electric water heater can comprise three heating loops. For example, a heating circuit may be formed by a first wire connected to the end of the phase line terminal L1, a first wire connected to the end of the phase line terminal L2, a heating tube corresponding to K1 connected to the first wire, and a heating tube corresponding to K3 connected to the first wire. The heating circuit can be composed of a first wire connected to the end of the phase line end L1, a first wire connected to the end of the phase line end L2, a heating tube corresponding to K1 connected to the first wire and a heating tube corresponding to K4 connected to the first wire. The heating circuit can be composed of a first wire connected to the end L2 of the phase line, a first wire connected to the end L3 of the phase line, a heating tube corresponding to K3 connected to the first wire and a heating tube corresponding to K4 connected to the first wire. The fault detection device of the electric water heater may include a leakage detection circuit 40, a third wire 50, a first switch (K1, K3, and K4), a second switch K2, and a control circuit 60.
K1-K4 may be intelligently controlled to open and close periodically by control circuit 60 for leakage detection and power outage detection. The period of the electric leakage detection and the power failure detection of the whole circuit can be 3 seconds, and the total time of the electric leakage detection and the power failure detection of the heating tube correspondingly connected with any two phase line ends is 1 second.
To ensure the safety performance of the electric water heater, whether the electric water heater has faults or not can be detected periodically, and the faults can comprise whether the heating circuit has leakage faults or not and power failure faults or not.
First, detecting whether all heating circuits have leakage faults, K1 closed, K2 open, K3 closed and K4 closed can be intelligently controlled by the control circuit 60. If the control circuit 60 does not receive the leakage detection signal, it can be determined that all the heating tubes corresponding to the heating circuits are in a normal working state. If the detection circuit 60 receives the leakage detection signal, it can determine that the heating tube corresponding to at least one heating circuit has a leakage fault.
Then, in order to specifically detect which heating circuit corresponds to the heating tube in which the leakage failure occurs, the leakage detection may be performed for each heating circuit. The time for detecting the electric leakage of the heating loop corresponding to any two phase line ends can be 0.9 seconds.
For example, K2 open, K1 closed, K3 closed, and K4 open may be intelligently controlled by control circuitry 60. If the control circuit 60 receives the leakage detection signal, it can determine that at least one heating tube corresponding to the heating circuits where K1 and K3 are located has a leakage fault. If the control circuit 60 does not receive the leakage detection signal, it can be determined that the heating tubes corresponding to the heating circuits where K1 and K3 are located are in a normal working state.
After the leakage detection, the control circuit 60 can intelligently control the opening of K1, the closing of K2 and the closing of one of K3-K4 to detect whether the heating circuit where the closed switch in K3-K4 is located has a power failure. The time for detecting the power failure of the heating loop corresponding to any two phase line ends is 0.1 second.
For example, K2 closed, K1 open, K3 open, and K4 closed may be intelligently controlled by control circuitry 60. If the control circuit 60 receives the leakage detection signal, it can be determined that the heating pipes corresponding to the heating circuits where K1 and K4 are located are in a normal working state. If the control circuit 60 does not receive the leakage detection signal, it may determine that the phase failure at the L1 end and/or the L3 end and/or the damage occurs to at least one heating tube corresponding to the heating circuit where K1 and K4 are located.
In summary, according to the fault detection device of the electric water heater of the embodiment of the invention, the leakage detection circuit generates the leakage detection signal when each heating circuit leaks electricity, the control circuit controls the first switch and the second switch to be opened and closed, and when the first switch is closed and the second switch is opened, if the control circuit receives the leakage detection signal, the heating circuit corresponding to the first switch is judged to have leakage fault; when the first switch is opened and the second switch is closed, if the control circuit does not receive the electric leakage detection signal, the heating loop corresponding to the first switch is judged to have power failure. The device is through utilizing a leakage detection circuit, not only can detect whether the heating circuit takes place the electric leakage trouble, can also detect whether the heating circuit takes place the outage trouble, therefore the cost is lower, and the volume is less, and the practicality is higher.
Based on the above embodiments, the present invention also provides an electric water heater 1000.
Fig. 7 is a block schematic diagram of an electric water heater according to an embodiment of the present invention. As shown in fig. 7, an electric water heater 1000 according to an embodiment of the present invention includes the fault detection device 100 of the electric water heater according to the above embodiment.
It should be noted that, for details not disclosed in the electric water heater 1000 according to the embodiment of the present invention, please refer to details disclosed in the fault detection device 100 of the electric water heater according to the embodiment of the present invention, and detailed descriptions thereof will not be provided herein.
According to the electric water heater provided by the embodiment of the invention, the fault detection device of the electric water heater provided by the embodiment of the invention can detect whether the heating circuit has an electric leakage fault or not by utilizing the electric leakage detection circuit, and can detect whether the heating circuit has an outage fault or not, so that the electric water heater is low in cost, small in size and high in practicability.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (9)
1. A fault detection device for an electric water heater comprising a water storage liner and at least one heating circuit, wherein each heating circuit comprises a heating element, a first wire connected between one end of the heating element and a first end of a power supply, and a second wire connected between the other end of the heating element and a second end of the power supply, the fault detection device comprising:
the leakage detection circuit is arranged corresponding to the first wire and the second wire, and generates a leakage detection signal when each heating loop generates leakage;
a third wire connected between one end of the heating element and a first end of a power supply;
a first switch and a second switch, the first switch being connected to the first conductor, the second switch being connected to the third conductor;
the control circuit is connected with the leakage detection circuit and controls the opening and closing of the first switch and the second switch,
when the first switch is closed and the second switch is opened, if the control circuit receives the electric leakage detection signal, judging that the heating loop corresponding to the first switch has electric leakage fault;
when the first switch is opened and the second switch is closed, if the control circuit does not receive the electric leakage detection signal, judging that the heating loop corresponding to the first switch has power failure.
2. The fault detection device of an electric water heater of claim 1, wherein the first switch and the second switch are periodically opened and closed, wherein the second switch is opened when the first switch is closed and the second switch is closed when the first switch is opened.
3. The fault detection device of an electric water heater according to claim 2, wherein the power supply is a mains power supply, a first end of the power supply is a live end, and a second end of the power supply is a zero line end.
4. The fault detection device of an electric water heater according to claim 2, wherein the power supply is a three-phase four-wire power supply, the first end of the power supply is a zero line end, 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 supply is connected to one end of a corresponding heating tube through a corresponding first wire, and the zero line end of the three-phase four-wire power supply is connected to the other end of each heating tube through a second wire and a third wire, respectively.
5. The fault detection device of an electric water heater according to claim 2, wherein the power supply is a three-phase three-wire power supply, the first end of the power supply and the second end of the power supply are any two phase wire ends, wherein each phase wire end of the three-phase three-wire power supply is connected to one end of a corresponding heating tube through a corresponding first wire, any phase wire end of the three-phase three-wire power supply is connected to one end of a corresponding heating tube through a third wire, and the other ends of each heating tube are connected together.
6. The fault detection device of an electric water heater as claimed in any one of claims 1 to 5, wherein the electrical leakage detection circuit comprises an electrical leakage detection coil.
7. The fault detection device of an electric water heater according to claim 6, wherein the leakage detection coil is a loop coil, wherein the first and second wires are disposed inside an inner peripheral side of the loop coil, and the third wire is disposed outside an outer peripheral side of the loop coil.
8. The fault detection device of an electric water heater according to any one of claims 1-5, wherein the first switch or the second switch is one of a relay, a thyristor, an IGBT, a MOSFET.
9. An electric water heater, characterized by comprising a fault detection device of an electric water heater according to any one of claims 1-8.
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| CN201710517189.5A CN109210765B (en) | 2017-06-29 | 2017-06-29 | Electric water heater and fault detection device thereof |
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| CN109210765B true CN109210765B (en) | 2024-04-16 |
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| CN109210765A (en) | 2019-01-15 |
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