CN111157816A - Failure detection method and device for water inlet valve and steam box - Google Patents
Failure detection method and device for water inlet valve and steam box Download PDFInfo
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- CN111157816A CN111157816A CN201911414996.XA CN201911414996A CN111157816A CN 111157816 A CN111157816 A CN 111157816A CN 201911414996 A CN201911414996 A CN 201911414996A CN 111157816 A CN111157816 A CN 111157816A
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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Abstract
The invention discloses a failure detection method and a detection device of a water inlet valve and a steam box, wherein the detection method comprises the following steps: the equipment is operated, and a water inlet valve is started; sampling, namely sampling the working current of the water inlet valve according to a sampling period; preliminary judgment, judging whether the working current of the water inlet valve exceeds a threshold interval; and continuously judging, if the working current of the water inlet valve exceeds the threshold interval, continuously judging whether the working current of the water inlet valve still exceeds the threshold interval within the duration. The working current of the water inlet valve is sampled within the duration time, and statistical analysis is carried out to judge whether the working current of the water inlet valve is normal or not, so that whether the water inlet valve operates normally or not is determined and detected. Compared with the mode of pure water level detection or temperature detection and the like in the prior art, the current detection has higher response speed and higher sensitivity, can detect and judge the fault of the water inlet valve when dry burning is about to occur or before the dry burning occurs, and avoids the dry burning phenomenon.
Description
Technical Field
The application relates to the technical field of valves, in particular to a failure detection method and a failure detection device for a water inlet valve and a steam box.
Background
An inlet valve is a valve for controlling whether water can pass through, and is generally used in a water container such as a water tank, a water pool, and the like.
In the prior art, a water inlet valve is usually adopted for controlling water to enter the steam box, when the water in the steam box is evaporated to dryness, the steam box is dried, and the dry burning of the steam box is a main problem which influences the service life of a machine and causes potential safety hazards. The reason for this is that the water is not fed in time, such as the water tank is lack of water, the water inlet valve is damaged (or fails, malfunctions) and the like, which can cause the water to be fed in time.
At present, steam boxes on the market have water tank water shortage detection, but have no water inlet valve failure detection. The dry-heating prevention function mainly detects the temperature rising rate of the heating plate through a temperature sensor, but the mode has slow response and is easy to malfunction (the judgment mode is similar to the trip detection of the electric cooker, for example, the trip of the electric cooker is too early to cause the rice to be not cooked or the trip is too late to cause the rice to be burnt), and whether the dry-heating is needed to be judged through the short-time dry-heating, thereby influencing the service life of the machine and having potential safety hazard.
Disclosure of Invention
The application aims to provide a failure detection method and a failure detection device for a water inlet valve and a steam box, and aims to solve the problem that in the prior art, the water inlet valve is slow in detection reaction, so that equipment is easy to dry and burn.
Accordingly, in a first aspect of the present application, there is provided a method of detecting failure of an appliance inlet valve, comprising the steps of:
the equipment is operated, and a water inlet valve is started;
sampling, namely sampling the working current of the water inlet valve according to a sampling period;
preliminary judgment, judging whether the working current of the water inlet valve exceeds a threshold interval;
and continuously judging, if the working current of the water inlet valve exceeds the threshold interval, continuously judging whether the working current of the water inlet valve still exceeds the threshold interval within the duration.
The working current of the water inlet valve is sampled within the duration time, and the sampled current is subjected to statistical analysis to judge whether the working current of the water inlet valve is normal or not, so that whether the water inlet valve operates normally or not is determined and detected.
Further, in the continuous judgment, if the working current of the water inlet valve exceeds the threshold interval within the continuous time, the equipment stops running, gives a fault alarm and enters a fault early warning state; otherwise, the equipment operates normally.
And further, after fault alarm, maintaining, after maintenance is finished, operating the equipment for preset time, and if no fault alarm exists in the preset time, canceling the fault early warning state and converting the state into a normal working state.
Further, the operating current of the water inlet valve exceeding the threshold interval for the duration of time comprises: the working current of the water inlet valve exceeds the threshold interval in the whole duration.
Further, the operating current of the water inlet valve exceeding the threshold interval for the duration of time comprises: the total time that the working current of the water inlet valve exceeds the threshold interval is greater than the specified value in the whole duration.
Further, in the preliminary judgment, combining a water level signal of the equipment, if the water level is lower than a minimum value and the working current of the water inlet valve exceeds a threshold interval, the equipment stops running.
Further, the threshold interval is [66mA, 150mA ], and the duration is 3s to 5 s.
In a second aspect of the present application, there is provided a device for detecting the failure of an apparatus inlet valve, using the method of any one of the first aspect of the present application,
comprises a water inlet valve circuit and a main control chip;
the main control chip is used for sampling the working current of the water inlet valve in the water inlet valve circuit and controlling the equipment to run and stop according to the sampled working current of the water inlet valve.
The water level detection module is in communication connection with the main control chip and can send detected water level signals to the main control chip, and the main control chip can control the equipment to run and stop by combining the water level signals with the working current of the water inlet valve.
Further, the water inlet valve circuit comprises a driving circuit and an AD conversion circuit, the driving circuit is used for driving the water inlet valve to run or stop, and the AD conversion circuit is used for converting the analog signal of the water inlet valve into a digital signal.
In a third aspect of the present application, there is provided a steam box comprising the detection device of any one of the second aspects of the present application.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The descriptions and connections shown in the present specification are only used for matching with the contents disclosed in the specification, so that those skilled in the art can understand and read the description, and do not limit the conditions and limitations that the present application can implement, so that the present specification has no technical significance, and any modifications, changes in connection relationships, or adjustments of the descriptions in any form should still fall within the scope of the present disclosure without affecting the efficacy and achievable purpose of the present application.
FIG. 1 is a main flow chart of a test method in example 1 of the present application;
FIG. 2 is a detailed flowchart of the test method in example 1 of the present application;
fig. 3 is a schematic diagram of connection relationships among modules of the test apparatus in embodiment 2 of the present application.
Description of reference numerals:
100. a water inlet valve circuit;
101. a drive circuit;
102. an AD conversion circuit;
200. a main control chip;
300. a water level detection module;
400. and a device main controller.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the embodiments of the present application, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
In order to more intuitively describe the technical scheme of the embodiment of the present application, the following embodiment is described in the case of applying the water inlet valve to the steam box, but in practice, there are many other apparatuses applying the water inlet valve, and therefore, the "steam box" in the following embodiment should be understood as an apparatus applying the water inlet valve, and is not limited to the steam box.
Example 1
As shown in fig. 1, the present embodiment provides a method for detecting a failure of an apparatus inlet valve, which mainly includes the following steps:
s1: the equipment is operated, and a water inlet valve is started;
s2: sampling, namely sampling the working current of the water inlet valve according to a sampling period;
s3: preliminary judgment, judging whether the working current of the water inlet valve exceeds a threshold interval;
s4: and continuously judging, if the working current of the water inlet valve exceeds the threshold interval, continuously judging whether the working current of the water inlet valve still exceeds the threshold interval within the duration.
In the continuous judgment, if the working current of the water inlet valve exceeds a threshold value interval within the continuous time, the equipment stops running, gives a fault alarm and enters a fault early warning state; otherwise, the equipment operates normally.
The failure reporting can be reported in the form of a buzzer or a signal lamp.
The working current of the water inlet valve is sampled within the duration time, and the sampled current is subjected to statistical analysis to judge whether the working current of the water inlet valve is normal or not, so that whether the water inlet valve operates normally or not is determined and detected.
In conjunction with fig. 2, further:
and after the fault alarm is finished, the equipment operates for preset time, and if no fault alarm exists in the preset time, the fault state is cancelled and the normal working state is changed.
In order to improve the safety level of the failure protection of the water inlet valve, the water inlet valve is set to be incapable of automatically recovering faults, and needs a user to operate for a certain time after maintenance, so that the faults are cleared, the recurrence is prevented, and the safety is improved.
The threshold interval in this embodiment includes a lowest value and a highest value, and when the current of the water inlet valve during operation is higher than the highest value or lower than the lowest value, the current is considered to exceed the threshold interval, and the threshold interval is determined according to the accuracy required by the device to which the water inlet valve is applied in practice, and the smaller the threshold interval, the higher the accuracy, the larger the threshold interval, and the lower the accuracy.
The threshold interval may be [66mA, 150mA ], wherein the lowest value, e.g. 66mA, is determined from 80% of the normal operating current and the highest value, e.g. 150mA, is determined directly from the locked-rotor current.
The duration in this embodiment may be set to 3 seconds, and the specific duration is determined according to actual needs, for example, the duration may be set to 3 seconds to 5 seconds, and the longer the duration is, the slower the fault is reported, the shorter the duration is, the faster the fault is reported, and the requirement for reporting the speed of the fault is determined according to specific equipment to which the water inlet valve is applied.
The trial operation time in this embodiment may be set to 15 minutes, the specific trial operation time is determined according to the requirements of the device to which the water inlet valve is actually applied, the trial operation is to determine that there is no other fault, and the water inlet valve is restarted under the condition that the existence of the other fault is eliminated, so as to ensure that the water inlet valve is successfully maintained, and therefore, the longer the trial operation time is, the more accurate the maintenance result judgment is.
The duration in this embodiment is the time taken by the continuous determination process, and the duration may be set to one time period or multiple time periods, and if the duration is set to multiple time periods, the lengths of the time periods may be set to be the same or different. The method for judging in the continuous judging process can be that the working current of the water inlet valve is judged to exceed the threshold interval all the time in the whole duration, and if the working current exceeds the threshold interval all the time, the continuous judging result is a fault.
The working current of the water inlet valve exceeds a threshold interval in the duration time comprises the following steps: the working current of the water inlet valve exceeds the threshold interval in the whole duration.
The working current of the water inlet valve exceeds a threshold interval in the duration time comprises the following steps: the total time that the working current of the water inlet valve exceeds the threshold interval is greater than the specified value in the whole duration.
The method for judging in the continuous judging process can also be used for calculating the total time that the working current of the water inlet valve exceeds the threshold interval, and if the total time that the working current of the water inlet valve exceeds the threshold interval is larger than a specified value, the water inlet valve is indicated to be in fault. Based on the judgment method, when the duration is set to be a plurality of time periods, the current fluctuation amplitude of the water inlet valve and the ratio of the time that the fluctuation amplitude exceeds the threshold interval to the time that the fluctuation amplitude does not exceed the threshold interval can be statistically analyzed and accumulated to obtain experience judgment data, so that whether the water inlet valve is accidentally 'fault' (actually, the fault is not real, and the temporary working current fluctuation caused by the influence of water pressure, friction and other factors is caused) or real fault can be conveniently predicted when similar current data is detected in the next sampling process.
In the preliminary judgment, a water level signal of the equipment can be combined, if the water level is lower than the minimum value and the working current of the water valve exceeds a threshold value interval, the equipment stops running, and the detection accuracy is improved through the combined judgment of the working current of the water inlet valve and the water level signal. The lowest value of the water level can be one half of the volume of the container, for example, when the water level is lower than the lowest value, the water inlet valve is closed to stop water inlet, and the purpose of saving water is achieved.
Example 2
As shown in fig. 3, by applying the detection method of embodiment 1, the embodiment provides a device for detecting the failure of a water inlet valve of an apparatus, and includes a water inlet valve circuit 100 and a main control chip 200, wherein the water inlet valve circuit 100 is electrically connected to the main control chip 200, the water inlet valve circuit 100 can convert an analog signal of the water inlet valve into a digital signal, and the main control chip 200 is used for sampling a water inlet valve working current converted into a direct current in the water inlet valve circuit 100; and the device can be controlled to run and stop according to the sampled working current of the water inlet valve. The main control chip 200 is communicatively connected to a device main controller 400 (in this embodiment, the device refers to a steam box but is not limited to a steam box), the main control chip 200 sends a detection signal to the device main controller, the device main controller 400 controls the device to operate and stop based on the signal sent by the main control chip 200, and in practice, the main control chip 200 may also be connected to a device execution unit so as to directly control the device to stop and operate.
The water inlet valve circuit 100 comprises a driving circuit 101 and an AD conversion circuit 102, the driving circuit 101 is electrically connected with the AD conversion circuit 102, the driving circuit 101 is used for driving the water inlet valve to run or stop, and the AD conversion circuit 102 is used for converting an analog signal of the water inlet valve into a digital signal so as to facilitate detection. This arrangement requires only the connection of the AD conversion circuit 102 to the existing driver circuit 101, and is low in cost.
When the main control chip 200 detects that the working current of the water inlet valve exceeds the set threshold interval and lasts for a certain time, the water inlet valve is judged to be in fault, the steam box stops working, the fault is reported, and the steam box can be continuously used after the fault is manually cleared after maintenance. In order to improve the fault protection safety level of the water inlet valve, the water inlet valve is set to be incapable of automatically recovering faults, and needs to be manually operated for a certain time after being maintained by a user, so that the faults are cleared, the recurrence is prevented, and the safety is improved.
The water level detection module 300 is in communication connection with the main control chip 200, the water level detection module 300 can send detected water level signals to the main control chip 200, the main control chip 200 can control the equipment to run and stop based on the combination of the water level signals and working current, and the detection accuracy is improved through the combination judgment of the working current of the water inlet valve and the water level signals.
Example 3
This embodiment provides a steam box, which includes the detection device in embodiment 1, and the function of the detection device in the steam box device is the same as that in the above embodiments, which is not described again in this embodiment.
It is obvious to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the above function distribution may be performed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to perform all or part of the above described functions. For the specific working process of the device described above, reference may be made to the corresponding process in the foregoing method embodiment, which is not described herein again.
It should be noted that, in the embodiments of the method and the apparatus, the included modules are only divided according to functional logic, but are not limited to the above division as long as the corresponding functions can be implemented; in addition, specific names of the functional modules are only used for distinguishing one functional module from another, and are not used for limiting the protection scope of the application.
In addition, it can be understood by those skilled in the art that all or part of the steps in the method for implementing the embodiments described above can be implemented by instructing the relevant hardware through a program, and the corresponding program can be stored in a computer-readable storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, or the like.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (11)
1. A failure detection method for an equipment water inlet valve is characterized by comprising the following steps:
the equipment is operated, and a water inlet valve is started;
sampling, namely sampling the working current of the water inlet valve according to a sampling period;
preliminary judgment, judging whether the working current of the water inlet valve exceeds a threshold interval;
and continuously judging, if the working current of the water inlet valve exceeds the threshold interval, continuously judging whether the working current of the water inlet valve still exceeds the threshold interval within the duration.
2. The method as claimed in claim 1, wherein in the continuous judgment, if the working current of the water inlet valve exceeds the threshold interval within the continuous time, the equipment stops running, gives a fault alarm and enters a fault early warning state; otherwise, the equipment operates normally.
3. The method as claimed in claim 2, wherein the maintenance is performed after the malfunction alarm, after the maintenance is completed, the equipment is operated for a predetermined time, and if no malfunction alarm is generated within the predetermined time, the malfunction pre-warning state is cancelled, and the equipment is converted into the normal operation state.
4. The method of any of claims 1 to 3, wherein operating current of the fill valve to exceed the threshold interval for the duration of time comprises: the working current of the water inlet valve exceeds the threshold interval in the whole duration.
5. The method of any of claims 1 to 3, wherein operating current of the fill valve to exceed the threshold interval for the duration of time comprises: the total time that the working current of the water inlet valve exceeds the threshold interval is greater than the specified value in the whole duration.
6. The method of claim 1, wherein in the preliminary determination, in combination with a water level signal of the device, the device stops if the water level is below a minimum value and the operating current of the water inlet valve exceeds a threshold interval.
7. The method according to claim 1, characterized in that said threshold interval is [66mA, 150mA ] and said duration is 3s-5 s.
8. A device for detecting the failure of an inlet valve of an apparatus, wherein the method of any one of claims 1 to 7 is applied, and comprises an inlet valve circuit (100) and a main control chip (200);
the main control chip (200) is used for sampling the working current of the water inlet valve in the water inlet valve circuit (100) and controlling the equipment to run and stop according to the sampled working current of the water inlet valve.
9. The detection device according to claim 8, further comprising a water level detection module (300), wherein the water level detection module (300) is in communication connection with the main control chip (200), the water level detection module (300) can send a detected water level signal to the main control chip (200), and the main control chip (200) can control the operation and stop of the equipment based on the water level signal in combination with the working current of the water inlet valve.
10. The detection device according to claim 8 or 9, wherein the water inlet valve circuit (100) comprises a driving circuit (101) and an AD conversion circuit (102), the driving circuit (101) is used for driving the water inlet valve to operate or stop, and the AD conversion circuit (102) is used for converting an analog signal of the water inlet valve into a digital signal.
11. A steam box, characterized in that it comprises a detection device according to any one of claims 8 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911414996.XA CN111157816A (en) | 2019-12-31 | 2019-12-31 | Failure detection method and device for water inlet valve and steam box |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911414996.XA CN111157816A (en) | 2019-12-31 | 2019-12-31 | Failure detection method and device for water inlet valve and steam box |
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| CN111157816A true CN111157816A (en) | 2020-05-15 |
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| CN201911414996.XA Pending CN111157816A (en) | 2019-12-31 | 2019-12-31 | Failure detection method and device for water inlet valve and steam box |
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| CN112099476A (en) * | 2020-09-27 | 2020-12-18 | 珠海格力电器股份有限公司 | Fault early warning method, device and system and storage medium |
| CN114325281A (en) * | 2020-09-29 | 2022-04-12 | 深圳市帝迈生物技术有限公司 | Fault detection method and device based on refrigerating sheet and computer readable storage medium |
| CN116879578A (en) * | 2023-06-21 | 2023-10-13 | 清华大学 | Road acceleration sensor, control method and control device thereof |
| CN117628002A (en) * | 2023-11-01 | 2024-03-01 | 广州和德智能装备制造有限公司 | A stuck valve detection method, device, terminal equipment and storage medium for a servo valve |
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Application publication date: 20200515 |
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