CN211601150U - Electric water heater - Google Patents
Electric water heater Download PDFInfo
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- CN211601150U CN211601150U CN201921643150.9U CN201921643150U CN211601150U CN 211601150 U CN211601150 U CN 211601150U CN 201921643150 U CN201921643150 U CN 201921643150U CN 211601150 U CN211601150 U CN 211601150U
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Abstract
The utility model discloses an electric water heater, including inner bag, electric heating pipe and control module, electric heating pipe passes through the flange fixed with the inner bag, the flange with the inner bag is insulating fixed, still includes electric leakage detection device, the flange with be connected with a protection resistance between the inner bag, electric leakage detection device sets up in the inner bag outside and is close to protection resistance's position department, electric leakage detection device's sensing element and protection resistance non-contact setting, and electric leakage detection device is connected with alarm module or control module. The utility model discloses an electric water heater sets up sensing element through the position department that is close to protection resistance, and its alternating current electric field around can the perception when electric water heater takes place the ground wire electric leakage, no matter whether it switches on the return circuit, sensing element can produce sensing signal, and the detection principle of this scheme does not rely on the electric current balance of live wire and zero line, also need not to require leakage current to form the return circuit, and the application scope of detection is more extensive, avoids taking place the condition of examining that leaks.
Description
Technical Field
The utility model belongs to the technical field of add hot water system, specifically speaking relates to an electric water heater.
Background
When the electric leakage occurs, the live wire is generally connected with the ground wire, so that the ground wire is electrified. If the ground is good, the electricity generated will be conducted to the ground without danger. In order to prevent the ground wire from being grounded poorly, some electrical appliances take some leakage protection measures, and for an electric water heater, the current main leakage protection measures include the following:
the leakage protection coil detects leakage by passing a live wire and a zero line through a detection coil simultaneously, and is used for detecting live wire current and zero line current, and when the live wire current and the zero line current are inconsistent, the leakage is judged to be leakage. However, the premise of this detection method is that the electrical appliance is normally connected to the ground wire, and the situation that the live wire current and the zero line current are inconsistent occurs only when the leakage occurs, if the electrical appliance is not connected to the ground wire due to a design defect or a fault, the live wire current and the zero line current are still the same when the leakage occurs, and the leakage cannot be detected by the leakage protection coil method, which results in the detection leakage.
The scheme that the opto-coupler detected is whether to form the return circuit before detecting ground wire and wall, in case the electric leakage forms the return circuit and can detect, if the wall body does not have good ground connection, has great resistance to ground, then loop current undersize, and the mode that the opto-coupler detected will unable detection leakage current, causes the hourglass to examine.
Disclosure of Invention
The utility model discloses to current electric water heater leakage detection not accurate, the technical problem who leaks to examine appears easily, has provided an electric water heater, can solve above-mentioned problem.
In order to realize the purpose of the utility model, the utility model adopts the following technical scheme to realize:
the utility model provides an electric water heater, includes inner bag, electric heating pipe and control module, electric heating pipe pass through the flange with the inner bag is fixed, the flange with the inner bag is insulating fixed, still includes electric leakage detection device, the flange with be connected with a protection resistance between the inner bag, electric leakage detection device sets up the inner bag outside and be close to protection resistance's position department, electric leakage detection device's induction element with protection resistance non-contact sets up, and electric leakage detection device is connected with alarm module or control module.
Further, the leakage detecting device further includes:
the input end of the amplifying circuit is connected with the sensing element, and the output end of the amplifying circuit is connected with the control module;
the power supply module is used for supplying power to the amplifying circuit;
the protective resistor and the inductive element are enclosed in the shielding case and used for shielding external electromagnetic signals from entering the shielding case.
Further, the induction element is an induction coil or an induction coil.
Furthermore, the amplifying circuit comprises a first switch circuit and a voltage dividing circuit, one end of the voltage dividing circuit is connected with a power supply, the other end of the voltage dividing circuit is connected with the ground through the first switch circuit, and the induction signal generated by the induction element is used for controlling the conduction state of the first switch circuit.
Furthermore, the amplifying circuit further comprises a second switch circuit, one end of the second switch circuit is connected with the power supply, the other end of the second switch circuit is connected with the control end of the first switch circuit, and the control end of the second switch circuit is connected with the sensing element.
Furthermore, a filter capacitor is connected in parallel to two ends of the first switch circuit.
Further, the first switching circuit is a first NPN triode, the second switching circuit is a second NPN triode, a collector of the first NPN triode is connected to the voltage dividing circuit, an emitter of the first NPN triode is connected to ground, a base of the second NPN triode is connected to the sensing element, a collector of the second NPN triode is connected to the power supply, and an emitter of the second NPN triode is connected to the base of the first NPN triode.
Further, the amplifying circuit is an integrated operational amplifier.
Furthermore, the shielding case comprises a metal shielding layer and an insulating layer, wherein the metal shielding layer is positioned on the inner side, and the insulating layer is positioned on the outer side.
Furthermore, the control module is connected with a communication module for communicating with a main power switch, and the main power switch is used for controlling the on-off state of a main input power supply.
Compared with the prior art, the utility model discloses an advantage is with positive effect: the utility model discloses an electric water heater, position department through being close to protection resistance sets up induction element, its alternating current field around can the perception, when electric water heater takes place the ground wire electric leakage, be equivalent to protection resistance and 220V alternating current connection, no matter it switches on and forms the return circuit, all can send alternating current field to the space, when having alternating current field around induction element, can produce the sensing signal, it is very sensitive and accurate to the electric leakage detection of ground wire, the detection principle of this scheme does not rely on the current balance of live wire and zero line, also need not to require leakage current to form the return circuit, the application scope of detection is more extensive, avoid taking place the condition of hourglass detection.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when read in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of an electric water heater according to the present invention;
FIG. 2 is a schematic block diagram of the leakage detection of the electric water heater of FIG. 1; FIG. 3 is a schematic block diagram of an electrical leakage detecting device of an electric water heater according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of an embodiment of the leakage detecting device in fig. 3.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "inside", "outside", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In a first embodiment, the present embodiment provides an electric water heater, as shown in fig. 1 and fig. 2, which includes an inner container 11, an electric heating pipe 12, and a control module 13, where the electric heating pipe 12 is fixed to the inner container 11 through a flange 14, the flange 14 is fixed to the inner container 11 in an insulating manner, and further includes a leakage detecting device 15, a protection resistor 16 is connected between the flange 14 and the inner container 11, and the inner container 11 and the electric heating pipe 12 should be arranged in an insulating manner, and the specific connection manner may be: the inner container 11 is fixed with the flange 14 through a connecting piece 17, the electric heating pipe 12 is fixed on the flange 14, and the connecting piece 17 is isolated from the flange 14 through an insulating structure. The flange 14 is connected with the inner container 11 through a protection resistor 16, when electric leakage occurs, the electric leakage can cause water in the inner container, the inner container 11, the flange 14 and the protection resistor 16 to be electrified, the electric leakage detection device 15 is arranged on the outer side of the inner container 11 and close to the protection resistor 16, the sensing element 151 of the electric leakage detection device 15 is arranged in a non-contact mode with the protection resistor 16, and the electric leakage detection device 15 is connected with the alarm module or the control module 15. The sensing element 151 senses an alternating current field around and generates a sensing signal. Protection resistance 16 is the zero potential under the normal condition, also can not be to space radiation electric field, alternating voltage applys at inner bag 11 when taking place the electric leakage, on flange 14 and protection resistance 16, be equivalent to protection resistance 16 and 220V alternating current connection, no matter it switches on and forms the return circuit, all can send alternating current electric field to the space, when having alternating current electric field around induction element, can produce induction signal, it is very sensitive and accurate to the electric leakage detection of ground wire, the detection principle of this scheme does not rely on the current balance of live wire and zero line, also need not to require leakage current to form the return circuit, the application scope of detection is more extensive, avoid taking place the condition of missed measure. When the leakage detection device 15 detects a leakage signal, the leakage signal can be directly sent to the alarm module to give an alarm, or sent to the control module 15, and the control module takes protection control measures, such as controlling the power supply of the water heater to be disconnected.
Non-contact setting between the induction element 151 and the protective resistor 16 of the leakage detection device 15, when the protective resistor 16 has leakage, the electric field radiated to the space can be detected by the induction element 151, and meanwhile, the protective resistor 16 can be prevented from directly contacting the induction element 151, so that the high-voltage alternating current is damaged to the induction type leakage detection device, in addition, the protective resistor 16 with leakage can be prevented from continuously transmitting the electricity to the leakage detection device, so that a leakage point is increased, and further, the electric shock risk is increased.
The inner container of the water storage type electric water heater is easy to corrode due to long-term immersion in water. The common anti-corrosion means is to put a magnesium rod 20 in the inner container, and protect the cathode by using a sacrificial anode, wherein the magnesium rod 20 is used as the anode, the metal inner container 11 is used as the cathode, a galvanic cell is formed between the cathode and the anode by a conductive aqueous medium, the magnesium rod 20 is used as the anode of the cell and is corroded to be consumed, and the inner container 11 is used as the cathode to be protected. Through adopting protection resistance 16 to be connected inner bag and flange 14 in this scheme, and then be connected electric heating pipe 12 and inner bag 11, magnesium stick 20 plays the effect of protection electric heating pipe 12 equally, through setting up protection resistance 16, can not make protection current too big again, causes the excessive consumption of magnesium stick 20.
As a preferred embodiment, the electric leakage detecting device 15 further includes an amplifying circuit 152, a power module 153 and a shielding case 154, the sensing element 151 can sense a surrounding alternating current electric field and generate a sensing signal, generally, the sensing signal of the sensing element 151 is weak and needs to be sent to the amplifying circuit 152 for amplification, an input end of the amplifying circuit 152 is connected with the sensing element 151, an output end of the amplifying circuit 152 is connected with the alarm module or the control module, the amplifying circuit 152 amplifies and outputs the sensing signal, and the value alarm module can directly output an alarm prompt, and can also output a value control module, and the control module takes a protection control measure; the power module 153 is used for providing power for the amplifying circuit 152, and may be implemented by a battery capable of outputting direct current, or may be a power conversion module, which inputs alternating current to convert the alternating current into direct current to power the amplifying circuit 152, because the electrical equipment needs to supply alternating current for normal operation, in order to prevent the power line normally supplying power from interfering with the induction type leakage detecting device and causing erroneous judgment, in the present scheme, by providing the shielding case 154, at least the sensing element 151 and the sensed object are enclosed in the shielding case 154 for shielding external electric field and preventing the sensed object from entering the shielding case 154, and causing interference to the sensing element 151, and only sensing the alternating current electric field of the sensed object which is also located inside the shielding case 154, the shielding case 154 may be implemented by a good metal conductor with an internal hollow shell, and the shielding case 154 needs to be connected to the ground by an independent wire, by grounding the shielding case 154, the same amount of positive charges induced on the surface of the shielding case 154 by the external ac electric field are discharged along the grounding wire into the ground plane, so that the power line generated by the external ac electric field source can be shielded outside the shielding case.
The alarm module and the control module can be selected from one or both of them.
It should be noted that the detected object should be a conductor, the detected object should be 0 potential under normal conditions, that is, an electric field is not radiated to the space, when an alternating voltage is applied to the detected object during leakage, there is a danger of electric shock when a person directly touches the detected object or touches another conductor electrically connected to the detected object, and the detected object may be a part of an electrical apparatus or may be a ground wire in a power line.
The inductive element 151 is realized by adopting a metal pickup sheet or an inductive coil, the detected body can be wholly or partially sealed in the shielding case 154, the inductive element 151 and the detected body are arranged in a non-contact way, the two are arranged in a non-contact way, when the detected body has electric leakage, the electric field radiated to the space can be detected by the inductive element 151, meanwhile, the detected body can be prevented from directly contacting the inductive element 151, the high-voltage alternating current is caused to damage the inductive electric leakage detection device, in addition, the detected body with the electric leakage can be prevented from continuously transmitting the electric to the electric leakage detection device, an electric leakage point is increased, and further, the electric shock risk is increased.
The amplifying circuit 152 is configured to amplify a small signal sensed by the sensing element 151 to a state that can be identified by the control module or can control the alarm module to generate an alarm, and preferably, in this embodiment, as shown in fig. 3, the amplifying circuit 152 includes a first switch circuit and a voltage dividing circuit, one end of the voltage dividing circuit is connected to the power module, the other end of the voltage dividing circuit is connected to ground through the first switch circuit, the power module is configured to provide a dc operating voltage VCC for the voltage dividing circuit, a signal output terminal LDJC of the amplifying circuit 152 is disposed between the voltage dividing circuit and the first switch circuit, a sensing signal generated by the sensing element 151 is configured to control a conducting state of the first switch circuit, when no electric leakage occurs, the sensing element 151 does not sense a signal, and therefore, the first switch circuit is not conducting, no conducting loop is formed between the corresponding dc operating voltage VCC and ground, a signal state output by the signal output terminal ld, when the leakage occurs, the sensing element 151 generates a sensing signal, when the voltage of the sensing signal is sufficient to turn on the first switch circuit, the first switch circuit is turned on, a conduction loop is formed between the corresponding direct current working voltage VCC and the ground, the signal output end LDJC has a signal output, and the state of the signal output by the signal output end LDJC changes, which indicates the leakage. The signal can be directly used for controlling the alarm module to give an alarm, and can also be sent to the control module, and the control module takes further protective measures, such as cutting off a power supply and the like.
In order to improve the stability and the driving capability of the amplifying circuit 152, the amplifying circuit 152 further includes a second switch circuit, one end of the second switch circuit is connected to the power module, the other end of the second switch circuit is connected to the control end of the first switch circuit, and the control end of the second switch circuit is connected to the sensing element. The sensing element 151 generates a sensing signal for controlling the conduction state of the first switch circuit, when the sensing signal generated by electric leakage drives the first switch circuit to be conducted, the direct-current working voltage VCC output by the power module can be directly loaded on the first switch circuit through the second switch circuit, the second switch circuit is conducted, the state of the signal output by the signal output end LDJC changes, which indicates electric leakage, or no electric leakage occurs.
In order to remove the interference wave introduced by the inductive element 151, the two ends of the first switch circuit are also connected in parallel with a filter capacitor C2, so as to improve the accuracy of the back-end detection judgment.
In this embodiment, a specific circuit composition of the amplifying circuit 152 is provided, as shown in fig. 4, the first switch circuit and the second switch circuit are respectively implemented by using one NPN triode, and the voltage dividing circuit is implemented by using one voltage dividing resistor R1, where the first switch circuit is a first NPN triode N1, the second switch circuit is a second NPN triode N2, a collector of the first NPN triode N1 is connected to the voltage dividing resistor R1, an emitter of the first NPN triode N1 is connected to ground, a base of the second triode N2 is connected to the sensing element 151, a collector of the second triode NPN N2 is connected to the power supply, and an emitter of the second triode N2 is connected to a base of the first NPN triode N1. When the induced signal generated by the leakage reaches the turn-on voltage of the second NPN triode N2, the second NPN triode N2 is turned on, the base of the first NPN triode N1 is connected to the power supply module through the second NPN triode N2, and accordingly the first NPN triode N1 is turned on, and the state of the signal output by the signal output terminal LDJC changes, which indicates the leakage.
Of course, the amplifying circuit 152 is not limited to the above-mentioned components, and may be implemented by an integrated operational amplifier, besides the above-mentioned switch circuit.
The shielding can 154 includes at least a metal shielding layer and an insulating layer (not shown), wherein the metal shielding layer is located at the inner side and the insulating layer is located at the outer side. The metal shielding layer plays the effect of shielding outside electric field, and the insulating layer plays to be insulating metal shielding layer and exterior structure, especially to outside metal parts, prevents that the exterior structure from electrically conducting to metal shielding layer when electrified, and then causing and damaging inside circuit, unable normal response electric leakage and cause and leak hunting.
The control module is connected with a communication module 18 and used for sending out a leakage signal in a wired or wireless mode, if the leakage signal is sent to a mobile terminal device of a user through wireless communication for prompting, the leakage signal can also be sent to a main power switch 19 and used for switching off the main power switch, so that electric shock danger caused by leakage of certain electric equipment can be prevented, and electric shock danger caused by conduction of the leakage signal to other electric appliances can be prevented.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or that equivalents may be substituted for elements thereof; such modifications and substitutions do not depart from the spirit and scope of the present invention, which is claimed.
Claims (10)
1. The utility model provides an electric water heater, includes inner bag, electric heating pipe and control module, electric heating pipe pass through the flange with the inner bag is fixed, the flange with the inner bag is insulating fixed, its characterized in that still includes electric leakage detection device, the flange with be connected with a protection resistance between the inner bag, electric leakage detection device sets up the inner bag outside and be close to protection resistance's position department, electric leakage detection device's induction element with protection resistance non-contact sets up, and electric leakage detection device is connected with alarm module or control module.
2. The electric water heater according to claim 1, wherein the electrical leakage detection device further comprises:
the input end of the amplifying circuit is connected with the sensing element, and the output end of the amplifying circuit is connected with the control module;
the power supply module is used for supplying power to the amplifying circuit;
the protective resistor and the inductive element are enclosed in the shielding case and used for shielding external electromagnetic signals from entering the shielding case.
3. The electric water heater according to claim 2, wherein the induction element is a metal pickup plate or an induction coil.
4. The electric water heater according to claim 2, wherein the amplifying circuit comprises a first switch circuit and a voltage dividing circuit, one end of the voltage dividing circuit is connected to a power supply, the other end of the voltage dividing circuit is connected to ground through the first switch circuit, and the sensing signal generated by the sensing element is used for controlling the conducting state of the first switch circuit.
5. The electric water heater of claim 4, wherein the amplifying circuit further comprises a second switching circuit, one end of the second switching circuit is connected to the power source, the other end of the second switching circuit is connected to the control terminal of the first switching circuit, and the control terminal of the second switching circuit is connected to the sensing element.
6. The electric water heater according to claim 4, wherein a filter capacitor is connected in parallel to both ends of the first switch circuit.
7. The electric water heater according to claim 5, wherein the first switching circuit is a first NPN transistor, the second switching circuit is a second NPN transistor, a collector of the first NPN transistor is connected with the voltage dividing circuit, an emitter of the first NPN transistor is connected with ground, a base of the second NPN transistor is connected with the sensing element, a collector of the second NPN transistor is connected with a power supply, and an emitter of the second NPN transistor is connected with the base of the first NPN transistor.
8. The electric water heater according to claim 2, wherein the amplifier circuit is an integrated op amp.
9. The electric water heater according to any one of claims 2-8, wherein the shielding cage includes a metallic shielding layer on an inner side and an insulating layer on an outer side.
10. The electric water heater according to any one of claims 1-8, wherein the control module is connected with a communication module for communicating with a main power switch for controlling the on/off state of a main input power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921643150.9U CN211601150U (en) | 2019-09-29 | 2019-09-29 | Electric water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921643150.9U CN211601150U (en) | 2019-09-29 | 2019-09-29 | Electric water heater |
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| Publication Number | Publication Date |
|---|---|
| CN211601150U true CN211601150U (en) | 2020-09-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921643150.9U Active CN211601150U (en) | 2019-09-29 | 2019-09-29 | Electric water heater |
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| Country | Link |
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| CN (1) | CN211601150U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114396727A (en) * | 2021-12-09 | 2022-04-26 | 武汉海尔热水器有限公司 | Controller circuit board applied to electric water heater and electric water heater |
-
2019
- 2019-09-29 CN CN201921643150.9U patent/CN211601150U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114396727A (en) * | 2021-12-09 | 2022-04-26 | 武汉海尔热水器有限公司 | Controller circuit board applied to electric water heater and electric water heater |
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