CN110285929A - A kind of leak water detdction circuit - Google Patents
A kind of leak water detdction circuit Download PDFInfo
- Publication number
- CN110285929A CN110285929A CN201910681216.1A CN201910681216A CN110285929A CN 110285929 A CN110285929 A CN 110285929A CN 201910681216 A CN201910681216 A CN 201910681216A CN 110285929 A CN110285929 A CN 110285929A
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- Prior art keywords
- switch
- detection
- leak water
- water detdction
- detection switch
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/16—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
- Detail Structures Of Washing Machines And Dryers (AREA)
- Emergency Alarm Devices (AREA)
Abstract
The present invention provides a kind of leak water detdction circuit, which includes: the first detection switch, driving switch, controllable switch and the second detection switch, wherein a terminal connecting zero line of the first detection switch；First control terminal of driving switch is connect with the other end of the first detection switch, second control terminal connects firewire, it is connect after the first output end connection of first the second detection switch of output end with the detection signal input part of peripheral control unit, second output terminal external level signal after being connect with the second output terminal of the second detection switch；One end of second detection switch is grounded, and the control terminal of the other end and controllable switch connects.By implementing the present invention, detect the water leakage situation of dish-washing machine jointly by the first detection switch and the second detection switch, judge whether that leak occurs by two kinds of detection modes, improve the reliability and detection efficiency of entire leak water detdction circuit detection, avoid due to independent float detect fail when, the problem of spilling water detection can not be carried out.
Description
Technical field
The present invention relates to fields of home appliance technology, and in particular to a kind of leak water detdction circuit.
Background technique
With advances in technology and the improvement of people's living standards, dish-washing machine are applied increasingly wider in daily life
It is general.The problem of being electric appliance of paddling, connected in entire dish-washing machine there is many places different size hose due to dish-washing machine.With washing
Bowl machine uses the increase of time, and the aging therewith of part of devices connector hose, when having the leakage of part water, fugitive water instills bottom cover, stream
Enter overflow launder.In order to find the leakage hidden trouble of dish-washing machine in time, avoids causing user unnecessary economic loss, generally wash the dishes
Machine all can increase spilling water detection device in the overflow launder of pedestal, which be generally switch, when there is water to leak to bottom
Gai Shi will form gathering for a certain amount of water at the low-lying place of bottom cover, and the buoyancy of water floats foam plastic float, and float high spot top is to floating
Sub- top microswitch, switch motion export water leakage, to realize water leakage detecting function.But when switch occurs
When failure, leak can not be detected in time, influence the reliability of entire detection device.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of leak water detdction circuit, to overcome leak in the prior art to examine
Survey the low problem of device reliability.
The embodiment of the invention provides a kind of leak water detdction circuits, comprising: the first detection switch, is controllably opened driving switch
Pass and the second detection switch, wherein a terminal connecting zero line of first detection switch；First control terminal of the driving switch with
The other end of first detection switch connects, and the second control terminal connects firewire, the second detection switch described in the first output end
It is connect after the connection of first output end with the detection signal input part of peripheral control unit, second output terminal and second detection switch
Second output terminal connection after external level signal；One end of second detection switch is grounded, and the other end is controllably opened with described
The control terminal of pass connects.
Optionally, first detection switch is switch, the leak water detdction circuit further include: open with the float
Close the float for being installed on default leak water detdction position being correspondingly arranged.
Optionally, second detection switch is two probes for being installed on default leak water detdction position.
Optionally, the probe is metal probe.
Optionally, the driving switch is photoelectrical coupler.
Optionally, the controllable switch is triode.
Optionally, the leak water detdction circuit further include: rectifier diode and first resistor, wherein two poles of the rectification
The forward end of pipe is connect with firewire, and backward end is connect with the second control terminal of the driving switch；One end of the first resistor
It is connect with the other end of first detection switch, the other end is connect with the second control terminal of the driving switch.
Optionally, the leak water detdction circuit further include: warning device, the warning device and the peripheral control unit
Output end connection generates alarm control signal when the detection signal input part of the peripheral control unit receives spilling water signal
The warning device is driven to alarm.
Optionally, when the external level signal is high level, the leak water detdction circuit further include: second resistance,
3rd resistor and one or more filter capacitors being connected in parallel, wherein one end of the second resistance and the driving switch
The first output end connection, the other end respectively with the detection signal of one end of the 3rd resistor, the peripheral control unit input
End and the connection of one end of one or more of filter capacitors being connected in parallel, the other end ground connection of the 3rd resistor are described
The other end for the filter capacitor that one or more is connected in parallel is grounded.
Optionally, when the external level signal is low level, the leak water detdction circuit further include: DC power supply,
4th resistance, the 5th resistance, the 6th resistance and one or more filter capacitors being connected in parallel, wherein the DC power supply is logical
The 4th resistance is crossed to connect with one end of one end of the 5th resistance and the 6th resistance respectively, the 5th resistance
The other end is connect with the first output end of the driving switch, the other end of the 6th resistance respectively with the peripheral control unit
Detection signal input part and one or more of filter capacitors being connected in parallel one end connection, it is one or more of simultaneously
Join the other end ground connection of the filter capacitor of connection.
Technical solution of the present invention has the advantages that
Leak water detdction circuit provided in an embodiment of the present invention, is detected jointly by the first detection switch and the second detection switch
The water leakage situation of dish-washing machine is judged whether that leak occurs by two kinds of detection modes, improves entire leak water detdction circuit and detect
Reliability and detection efficiency, avoid due to independent float detect fail when, the problem of spilling water detection can not be carried out.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of the leak water detdction circuit of the embodiment of the present invention；
Fig. 2 is another structural schematic diagram of the leak water detdction circuit of the embodiment of the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those skilled in the art are not having
Every other embodiment obtained under the premise of creative work is made, shall fall within the protection scope of the present invention.
As long as technical characteristic involved in invention described below different embodiments does not constitute punching each other
It is prominent to be combined with each other.
Fig. 1 shows a kind of structural schematic diagram of leak water detdction circuit according to an embodiment of the present invention, as shown in Figure 1, should
Leak water detdction circuit includes: the first detection switch SWCH1, driving switch U1, controllable switch Q1 and the second detection switch SWCH2,
Wherein, a terminal connecting zero line of the first detection switch SWCH1；The first control terminal of driving switch U1 and the first detection switch SWCH1
The other end connection, the second control terminal connect firewire, first the second detection switch of output end SWCH2 the first output end connection after
It is connect with the detection signal input part of peripheral control unit, the second output terminal of second output terminal and the second detection switch SWCH2 connect
Connect rear external high level signal (5V DC power supply)；One end of second detection switch SWCH2 is grounded, the other end and controllable switch Q1
Control terminal connection.It should be noted that in embodiments of the present invention, being using the first detection switch SWCH1 as switch, driving
Dynamic switch U1 is photoelectrical coupler, controllable switch Q1 is triode, the second detection switch SWCH2 is to carry out for metal probe
Illustrate, in practical applications, the type selecting of above-mentioned each device, which also can according to need, to be adjusted, as long as being able to achieve identical function
Energy, the present invention is not limited thereto.
In practical applications, since switch SWCH1 is directly connect with firewire and zero curve, in forceful electric power environment, and by
The second detection switch SWCH2 that metal probe is constituted is powered by DC power supply, light current environment is in, when above-mentioned switch
When the second detection switch SWCH2 that SWCH1 and metal probe are constituted is set to same leak water detdction circuit, need through photoelectricity coupling
Clutch U1 realizes the buffer action of forceful electric power light current, ensures that entire detection circuit work is mutually interference-free, improves the accurate of detection
Property.
Specifically, in one embodiment, above-mentioned leak water detdction circuit further includes being correspondingly arranged with switch SWCH1
It is installed on the float of default leaking area, in embodiments of the present invention, which is the overflow of the bottom cover of dish-washing machine
In slot, above-mentioned float is not shown in Fig. 1.
Specifically, in one embodiment, as shown in Figure 1, above-mentioned leak water detdction circuit further include: rectifier diode D1 and
First resistor R1, wherein the forward end of rectifier diode D1 is connect with firewire, the second control terminal of backward end and driving switch U1
Connection；One end of first resistor R1 is connect with the other end of the first detection switch SWCH1, and the second of the other end and driving switch U1
Control terminal connection.In practical applications, the effect of rectifier diode D1 is to reduce entire leak water detdction circuit by rectification
Power consumption, first resistor R1 are that current-limiting resistance plays the role of current limliting and partial pressure, in practical applications, are meeting power and pressure resistance
Under conditions of, guaranteeing can be lower using different types of packaged resistance according to the actual situation under circuit function and reliability situation, or
Using multiple resistance strings and mode, current limliting and voltage divide function are realized.
Specifically, in one embodiment, as shown in Figure 1, above-mentioned leak water detdction circuit further include: warning device P1, report
The output end of alarm device P1 and peripheral control unit connection, when the detection signal input part of peripheral control unit receives spilling water signal
When, generate alarm control signal driving warning device P1 alarm.In practical applications, which is MCU.
Specifically, in one embodiment, as shown in Figure 1, the second output terminal of driving switch U1 and the second detection switch
The second output terminal connection of SWCH2 is followed by 5V power supply, above-mentioned leak water detdction circuit further include: second resistance R2,3rd resistor
R3 and two filter capacitor C1, C2 being connected in parallel, wherein one end of second resistance R2 and the first output end of driving switch U1
Connection, what the other end was connected in parallel with one end of 3rd resistor R3, the detection signal input part of peripheral control unit and two respectively
One end of filter capacitor C1, C2 connects, the other end ground connection of 3rd resistor R3, two filter capacitor C1, C2's being connected in parallel
Other end ground connection.In practical applications, above-mentioned second resistance R2,3rd resistor R3 are partial pressure effect, two filters being connected in parallel
Wave capacitor C1, C2 are the effect of filtering, ensure the stability exported to the level signal of peripheral control unit.
The working principle of leak water detdction circuit as shown in Figure 1 is as follows:
Dish-washing machine is without spilling water phenomenon when working normally, therefore drying is anhydrous in overflow launder, and SWCH1, SWCH2 are in disconnected
Open state, photoelectrical coupler U1, triode Q1 are in off-state, the detection signal input part YISHUI_ of MCU at this time
CTRL detects low level, and MCU is failure to actuate；When dish-washing machine because be used for a long time because of parts thereof interface aging, have part water droplet
When leakage, fugitive water instills bottom cover, flows into overflow launder, increases with the increase buoyancy of rate of water added, and float is floated, and switch is dynamic
Make SWCH1 conducting, two metal probes SWCH2 after contacting water is connected, and YISHUI_CTRL detects height to R2, R3 partial pressure at this time
Level, due to MCU detection signal input part be high level triggering, can trigger MCU output alarm control signal driving with
The warning device P1 alarm of MCU output end connection, reminds user's dish-washing machine to send leak.In practical applications, when SWCH1,
YISHUI_CTRL can detect high level when any one in SWCH2 is connected, can also be with even if one of switch failure
Accurate detection spilling water phenomenon improves detection reliability, avoids bringing unnecessary loss for subscriber household.
It should be noted that in the embodiment shown in fig. 1, the detection signal input part of MCU is high level triggering, i.e.,
When detection signal input part receives high level signal, MCU can be triggered and detect water leakage, alarmed, actually answered
In, MCU may be alternatively provided as low level triggering, and modify peripheral circuit structure accordingly, this is the public affairs of those skilled in the art
Know common sense, the present invention is not limited thereto.
Fig. 2 shows the structural schematic diagrams of another leak water detdction circuit according to an embodiment of the present invention, as shown in Fig. 2,
The leak water detdction circuit includes: that 5V DC power supply, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 and two are connected in parallel
Filter capacitor C3, C4, wherein 5V DC power supply by the 4th resistance R4 respectively with one end of the 5th resistance R5 and the 6th resistance
One end of R6 connects, and the other end of the 5th resistance R5 is connect with the first output end of driving switch U1, and the 6th resistance R6's is another
One end of filter capacitor C3, C4 for being connected in parallel respectively with the detection signal input part of peripheral control unit and two is held to connect, two
The other end of a filter capacitor C3, C4 being connected in parallel is grounded.In practical applications, which is MCU.Such as Fig. 2 institute
After the second output terminal of driving switch U1 is connect with the second output terminal of the second detection switch SWCH2 in the leak water detdction circuit shown
Ground connection.The effect of the other components of the leak water detdction circuit and the respective devices of above-mentioned leak water detdction circuit shown in FIG. 1
I.e. function is consistent, is no longer repeated herein.
The working principle of leak water detdction circuit as shown in Figure 2 is as follows:
Dish-washing machine is without spilling water phenomenon when working normally, therefore drying is anhydrous in overflow launder, and SWCH1, SWCH2 are in disconnected
Open state, optocoupler U1, triode Q1 are in off-state, the detection signal input part YISHUI_CTRL detection of MCU at this time
To high level, MCU is failure to actuate；When dish-washing machine is because being used for a long time because of parts thereof interface aging, when having the leakage of part water droplet, leakage
Water outlet instills bottom cover, flows into overflow launder, increases with the increase buoyancy of rate of water added, and float is floated, and switch movement SWCH1 is led
Logical, SWCH2 is connected after two metal probe contact water, and R4, R5, R6 partial pressure, YISHUI_CTRL detects low level at this time.?
In practical application, when wherein any one is connected by SWCH1, SWCH2, YISHUI_CTRL can detect low level, due to
The detection signal input part of MCU is low level triggering, therefore triggers MCU output alarm control signal driving and connect with MCU output end
The warning device P1 alarm connect, reminds user's dish-washing machine to send leak.It can also accurately be examined even if one of switch failure
Spilling water phenomenon is surveyed, detection reliability is improved, avoids bringing unnecessary loss for subscriber household.
It should be noted that in an embodiment as illustrated in figure 2, the detection signal input part of MCU is low level triggering, i.e.,
When detection signal input part receives low level signal, MCU can be triggered and detect water leakage, alarmed, actually answered
In, MCU may be alternatively provided as high level triggering, and modify peripheral circuit structure accordingly, this is the public affairs of those skilled in the art
Know common sense, the present invention is not limited thereto.
By the cooperative cooperating of above-mentioned each component part, leak water detdction circuit provided in an embodiment of the present invention passes through
One detection switch and the second detection switch detect the water leakage situation of dish-washing machine jointly, judge whether to occur by two kinds of detection modes
Leak improves the reliability and detection efficiency of entire leak water detdction circuit detection, avoids and fail since independent float detects
When, the problem of can not carrying out spilling water detection, leak water detdction circuit provided in an embodiment of the present invention, which can be widely used in, to wash the dishes
Machine or other need to carry out in the household electrical appliance of leak water detdction, the present invention is not limited thereto.
Although being described in conjunction with the accompanying the embodiment of the present invention, those skilled in the art can not depart from the present invention
Spirit and scope in the case where various modifications and variations can be made, such modifications and variations are each fallen within by appended claims institute
Within the scope of restriction.
Claims (10)
1. a kind of leak water detdction circuit characterized by comprising the first detection switch (SWCH1), driving switch (U1), controllable
Switch (Q1) and the second detection switch (SWCH2), wherein
One terminal connecting zero line of first detection switch (SWCH1)；
First control terminal of the driving switch (U1) is connect with the other end of first detection switch (SWCH1), the second control
End processed connects firewire, after the first output end connection of the second detection switch (SWCH2) described in the first output end with peripheral control unit
Detection signal input part connection, second output terminal connect with the second output terminal of second detection switch (SWCH2) after outside
Connect level signal；
One end of second detection switch (SWCH2) is grounded, and the other end is connect with the control terminal of the controllable switch (Q1).
2. leak water detdction circuit according to claim 1, which is characterized in that first detection switch (SWCH1) is floating
Sub switch, the leak water detdction circuit further include: be installed on default leak water detdction position with what the switch was correspondingly arranged
Float.
3. leak water detdction circuit according to claim 1, which is characterized in that second detection switch (SWCH2) is two
A probe for being installed on default leak water detdction position.
4. leak water detdction circuit according to claim 3, which is characterized in that the probe is metal probe.
5. leak water detdction circuit according to claim 1, which is characterized in that the driving switch (U1) is photoelectric coupling
Device.
6. leak water detdction circuit according to claim 1, which is characterized in that the controllable switch (Q1) is triode.
7. leak water detdction circuit according to claim 1, which is characterized in that further include: rectifier diode (D1) and first
Resistance (R1), wherein
The forward end of the rectifier diode (D1) is connect with firewire, the second control terminal of backward end and the driving switch (U1)
Connection；
One end of the first resistor (R1) is connect with the other end of first detection switch (SWCH1), the other end with it is described
Second control terminal of driving switch (U1) connects.
8. leak water detdction circuit according to claim 1, which is characterized in that further include: warning device (P1), the alarm
Device (P1) is connect with the output end of the peripheral control unit, when the detection signal input part of the peripheral control unit receive it is excessive
When water signal, generates alarm control signal and drive warning device (P1) alarm.
9. leak water detdction circuit according to claim 1-8, which is characterized in that when the external level signal
When for high level, the leak water detdction circuit further include: second resistance (R2), 3rd resistor (R3) and it is one or more it is in parallel even
The filter capacitor connect, wherein
One end of the second resistance (R2) is connect with the first output end of the driving switch (U1), the other end respectively with it is described
One end of 3rd resistor (R3), the detection signal input part of the peripheral control unit and one or more of filters being connected in parallel
One end of wave capacitor connects, the other end ground connection of the 3rd resistor (R3), one or more of filtered electricals being connected in parallel
The other end of appearance is grounded.
10. leak water detdction circuit according to claim 1-8, which is characterized in that when the external level signal
When for low level, the leak water detdction circuit further include: DC power supply, the 4th resistance (R4), the 5th resistance (R5), the 6th resistance
(R6) and one or more filter capacitor being connected in parallel, wherein
The DC power supply by the 4th resistance (R4) respectively with one end of the 5th resistance (R5) and it is described 6th electricity
One end connection of (R6) is hindered, the other end of the 5th resistance (R5) is connect with the first output end of the driving switch (U1),
The other end of 6th resistance (R6) respectively with the detection signal input part of the peripheral control unit and one or more of
The one end for the filter capacitor being connected in parallel connects, the other end ground connection of one or more of filter capacitors being connected in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910681216.1A CN110285929A (en) | 2019-07-25 | 2019-07-25 | A kind of leak water detdction circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910681216.1A CN110285929A (en) | 2019-07-25 | 2019-07-25 | A kind of leak water detdction circuit |
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| Publication Number | Publication Date |
|---|---|
| CN110285929A true CN110285929A (en) | 2019-09-27 |
Family
ID=68023947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910681216.1A Pending CN110285929A (en) | 2019-07-25 | 2019-07-25 | A kind of leak water detdction circuit |
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| CN (1) | CN110285929A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113551844A (en) * | 2021-06-21 | 2021-10-26 | 青岛海尔电冰箱有限公司 | Refrigeration device |
| CN114277553A (en) * | 2021-12-20 | 2022-04-05 | 长虹美菱股份有限公司 | Washing machine bottom foot |
| CN117804694A (en) * | 2024-02-29 | 2024-04-02 | 天津瀚海蓝帆海洋科技有限公司 | Water leakage detection circuit for sealed cabin |
-
2019
- 2019-07-25 CN CN201910681216.1A patent/CN110285929A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113551844A (en) * | 2021-06-21 | 2021-10-26 | 青岛海尔电冰箱有限公司 | Refrigeration device |
| CN114277553A (en) * | 2021-12-20 | 2022-04-05 | 长虹美菱股份有限公司 | Washing machine bottom foot |
| CN114277553B (en) * | 2021-12-20 | 2024-03-29 | 长虹美菱股份有限公司 | Washing machine footing |
| CN117804694A (en) * | 2024-02-29 | 2024-04-02 | 天津瀚海蓝帆海洋科技有限公司 | Water leakage detection circuit for sealed cabin |
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