CN216924781U - Automatic detection device of gas water heater - Google Patents

Abstract

The application relates to an automatic detection device of a gas water heater. The automatic detection device of the gas water heater comprises an ignition flame detection module and a controller; the ignition flame detection module comprises a first switch unit, the first switch unit comprises a first end, a second end and a third end, the first end is used for being connected with the high-voltage signal output end to receive a high-voltage ignition signal, and the second end is used for being connected with a flame feedback receiving loop of the main control board; the controller is connected with the third end of the first switch unit and used for controlling the on-off between the first end and the second end so as to feed back the high-voltage ignition signal to the flame feedback receiving loop as a flame signal when the first end and the second end are conducted. The automatic detection device replaces the work of manual detection, can accurately simulate the actual ignition process of the water heater, and accurately detect whether the main control board of the water heater has problems on hardware and whether errors occur in the control program of the water heater, thereby reducing the errors of manual detection and increasing the accuracy of the detection device.

Description

Automatic detection device of gas water heater

Technical Field

The application relates to the technical field of detection of gas water heaters, in particular to an automatic detection device of a gas water heater and the gas water heater.

Background

The ICT and FCT tests are required to be carried out on the main controller after the main controller is produced in a workshop, and finally, the functions of the main controller are simply tested manually, and manual detection on the functions is very simple and is easy to omit and misjudge.

The existing detection of the main controller is that detection equipment directly outputs an analog signal to a circuit board, and the analog precision of the analog signal is low, so that the detection accuracy is influenced.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide an automatic detection device for a gas water heater and a gas water heater, which can accurately detect a main control panel of the gas water heater.

The utility model aims to provide an automatic detection device of a gas water heater,

the technical problem is solved by the following technical scheme:

the automatic detection device of the gas water heater comprises a main control board, wherein the main control board is provided with a high-voltage signal output end and is used for generating a high-voltage ignition signal and outputting the high-voltage ignition signal from the high-voltage signal output end; the main control board is also provided with a flame feedback receiving loop for receiving flame signals, and the automatic detection device comprises:

the ignition flame detection module comprises a first switch unit, the first switch unit comprises a first end, a second end and a third end, the first end of the first switch unit is used for being connected with the high-voltage signal output end to receive the high-voltage ignition signal, and the second end of the first switch unit is used for being connected with a flame feedback receiving loop of the main control panel;

and the controller is connected with the third end of the first switch unit and is used for controlling the on-off between the first end and the second end of the first switch unit so as to feed back the high-voltage ignition signal to the flame feedback receiving loop as the flame signal when the first end and the second end are conducted.

Compared with the background technology, the automatic detection device of the gas water heater has the following beneficial effects: the automatic detection device replaces the work of manual detection, and the controller of the automatic detection device accurately controls the required ignition time, so that the actual ignition process of the water heater can be accurately simulated, whether the main control board of the water heater has problems on hardware or not and whether errors occur on a control program of the water heater or not can be accurately detected, the errors of manual detection are reduced, and the accuracy of the detection device is improved.

In one embodiment, the ignition flame detection module further comprises a first anti-reverse diode, a cathode of the first anti-reverse diode is connected with the first end of the first switch unit, and an anode of the first anti-reverse diode is used for connecting the high-voltage signal output end. The first anti-reverse diode is arranged to prevent the high-voltage ignition signal from reversely impacting the high-voltage signal output end to cause the damage of the circuit of the main control board.

In one embodiment, the ignition flame detection module further includes a first current limiting resistor connected in series between a cathode of the first anti-reverse diode and the first terminal of the first switching unit. The first current limiting resistor is used for enabling a high-voltage ignition signal flowing through the first current limiting resistor to be relatively stable.

In one embodiment, the first switching unit includes:

the base electrode of the first triode is connected with the controller, and the emitting electrode of the first triode is grounded;

the first end of the coil of the first relay is connected with the collector of the first triode, the second end of the coil is used for being connected with a power supply, the first contact of the first relay is used for being connected with the high-voltage signal output end, and the second contact of the first relay is used for being connected with the flame feedback receiving loop.

In one embodiment, the first switch unit further includes a second anti-reverse diode connected in parallel with the coil of the first relay, an anode of the second anti-reverse diode is connected to the first end of the coil of the first relay, and a cathode of the second anti-reverse diode is connected to the second end of the coil of the first relay.

In one embodiment, the automatic detection device further comprises a temperature control detection module connected with the controller, and the temperature control detection module is used for being connected with the main control board.

In one embodiment, the temperature control detection module includes a charge and discharge unit, the charge and discharge unit includes a controlled end and a charge voltage output end, the controlled end is connected with the controller, and the charge voltage output end is used for being connected with a temperature signal receiving end of the main control board; the controller is further used for outputting a square wave signal with a preset frequency to the charging and discharging unit, and the charging unit is used for charging and discharging according to the square wave signal so as to output a stable voltage signal to a temperature signal receiving end of the main control board.

In one embodiment, the charge and discharge unit includes:

a base electrode of the second triode is connected with the controller, and a collector electrode of the second triode is connected with a power supply;

the first end of the electrolytic capacitor is connected with the emitter of the second triode, the first end of the electrolytic capacitor is a charging voltage output end, and the second end of the electrolytic capacitor is grounded;

and the discharge resistor is connected with the electrolytic capacitor in parallel.

In one embodiment, the automatic detection device further comprises a key function detection module connected with the controller, and the key function detection module is used for being connected with a key spring of the gas water heater.

In one embodiment, the key function detecting module includes:

the second switch unit comprises a fourth end, a fifth end and a sixth end, and the fourth end of the second switch unit is used for being connected with a key spring of a display of the gas water heater; the fifth end of the second switch is connected with the controller;

the floating ground is connected with the sixth end of the second switch unit;

the controller is further used for controlling the on-off of the fourth end and the sixth end of the second switch unit, so that the floating ground sends an electrostatic signal to the key spring when the fourth end and the sixth end are conducted.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an automatic detection device of a gas water heater and a connection thereof with a main control board in one embodiment;

FIG. 2 is a schematic diagram of an automatic detection device and its connection to a main control board according to another embodiment;

FIG. 3 is a schematic structural diagram of an ignition flame detection module and its connection with a main control board in one embodiment;

FIG. 4 is a schematic diagram of a temperature control detection module according to an embodiment;

FIG. 5 is a diagram illustrating an exemplary embodiment of a key function detection module;

FIG. 6 is a schematic structural diagram of a water flow function detection module according to an embodiment;

FIG. 7 is a schematic structural diagram of a water flow function detecting module in another embodiment;

fig. 8 is a schematic structural diagram of an automatic detection device in one embodiment.

Reference numerals: 100. the automatic detection device comprises an automatic detection device, 110, a controller, 120, an ignition flame detection module, 121, a first switch unit, 1211, a first relay, 130, a temperature control detection module, 131, a charge and discharge unit, 140, a water flow function detection module, 141, a first flow port, 1411, a first flow output port, 1412, a first flow input port, 150, a key function detection module, 151, a second switch unit, 1511, a second relay, 152, a floating ground, 153, a metal clip, 160, an alarm device, 170, a display device, 200, a main control board, 210, a high-voltage signal output end, 220, a flame feedback receiving circuit, 230, a temperature signal receiving end, 240, a second flow port, 241, a second flow input port, 242, a second flow output port, 300, a power supply, 400, a display, 410 and a key spring.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

It is to be understood that the terms "first", "second", and the like, as used herein, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to a number of technical features being indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. The terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. Further, in the description of the present application, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. In the description of the present application, "a number" means at least one, such as one, two, etc., unless specifically limited otherwise.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments is understood to mean "electrical connection", "communication connection", or the like, if there is a transfer of electrical signals or data between the connected objects.

As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

As background art, the detection of the circuit board in the prior art has certain limitation or excessively complicated operation, which is not beneficial for mass production of production personnel, so the utility model provides an automatic detection scheme of the gas water heater, and improves the detection precision of the main control board of the gas water heater.

In one embodiment, as shown in fig. 1, an automatic detection of a gas water heater is provided, the gas water heater includes a main control board 200, the main control board 200 is provided with a high voltage signal output end 210, the main control board 200 is used for generating a high voltage ignition signal and outputting the high voltage ignition signal from the high voltage signal output end 210; the main control board 200 is further provided with a flame feedback receiving circuit 220 for receiving a flame signal, and the automatic detection device 100 includes:

the ignition flame detection module 120, the ignition flame detection module 120 includes a first switch unit 121, and the first switch unit 121 includes a first end, a second end and a third end, wherein the first end of the first switch unit 121 is used for connecting the high-voltage signal output end 210 to receive a high-voltage ignition signal, and the second end of the first switch unit 121 is used for connecting the flame feedback receiving loop 220 of the main control board 200;

and the controller 110 is connected to the third end of the first switching unit 121, and is configured to control on/off between the first end and the second end of the first switching unit 121, so that when the first end and the second end are conducted, the high-voltage ignition signal is fed back to the flame feedback receiving circuit 220 as a flame signal.

The ignition detection function of the gas water heater is one of the important functions, when the gas water heater is in normal use, during ignition, the control chip on the main control board 200 outputs a high-voltage ignition signal to the ignition needle at the high-voltage signal output end 210 so that the ignition needle discharges after receiving the high-voltage ignition signal, thereby igniting the gas, after the gas is ignited to generate flame, the flame sensing needle senses the flame and sends a flame signal to the control chip of the gas water heater through the flame feedback receiving loop 220 on the main control board 200, and the main control board 200 needs to detect the flame signal within a preset time. In the embodiment, the actual high-voltage ignition signal generated by the main control board 200 is utilized to simulate the flame signal and is output to the control chip of the main control board 200 through the flame feedback receiving circuit 220 on the main control board 200, so that the purpose of detecting the flame detection function of the gas water heater is achieved.

Specifically, the automatic detection device 100 includes an ignition flame detection module 120 and a controller 110, the ignition flame detection module 120 includes a first switch unit 121, the controller 110 is configured to control on and off of the first switch unit 121, a first end of the first switch unit 121 is configured to be connected to a high-voltage signal output end 210 of the gas water heater, the high-voltage signal output end 210 may be an ignition needle of the gas water heater, and a second end of the first switch unit 121 is configured to be connected to a flame feedback receiving loop 220 of the main control board 200. The device can detect the hardware problem and the control program problem of the main control board 200, in the detection process, the main control board 200 controls to generate a high-voltage ignition signal, the high-voltage ignition signal cannot be transmitted through a circuit under the condition that the first switch unit 121 is switched off, the high-voltage ignition signal is equivalent to the ignition action of a water heater, the high-voltage ignition signal can be output from the high-voltage signal output end 210 under the condition that the first switch unit 121 is switched on and is input to the flame feedback receiving loop 220 as a flame signal through the first switch unit 121, and the flame is equivalent to the generation of flame of the water heater.

For the detection of the hardware, when the first switch unit 121 is turned on, if the main control board 200 detects the flame signal, it indicates that the flame detection function of the main control board 200 is qualified on the hardware, and if the main control board 200 does not detect the flame signal, it indicates that the flame detection function of the main control board 200 is not qualified on the hardware, for example, a problem may occur in the flame feedback receiving circuit 220. For the detection of the control programs, three control programs are mainly detected. Firstly, under the condition that the ignition of the water heater is successful within the preset time, whether the detection of the main control board 200 on the flame state is correct or not is detected, the time from the ignition start to the ignition success of the water heater needs to be controlled within the preset time, and if the ignition of the water heater is successful within the preset time, the flame state needs to be detected by the main control board 200 when the ignition is successful. This time of predetermineeing is extremely short usually (like in 1 ~ 2 s), and manual control needs reaction time, can't detect such short time, consequently can set up accurate conduction time through first switch unit 121 and carry out corresponding precision detection in order to replace the manpower. When the time within the preset time elapses from the generation of the ignition signal by the main control board 200, the controller 110 controls the first switch unit 121 to turn on the first terminal and the second terminal of the first switch unit 121, which is equivalent to the successful ignition of the water heater within the preset time, in this case, if the flame state detected by the main control board 200 is a flame state, the program detection is qualified, and if the flame state detected by the main control board 200 is a no-flame state, the program detection is not qualified. Secondly, under the condition that the ignition of the water heater is successful after the preset time, whether the detection of the main control board 200 on the flame state is correct or not is detected, and the specification of the water heater requires that the time from the ignition to the successful ignition cannot exceed the preset time (for example, within 1-2 s). When the time exceeding the preset time elapses from the generation of the ignition signal by the main control board 200, the controller 110 controls the first switch unit 121 to turn on the first terminal and the second terminal of the first switch unit 121, which corresponds to the successful ignition of the water heater after the preset time, in this case, if the flame state detected by the main control board 200 is a flame state, the program detection is not qualified, and if the flame state detected by the main control board 200 is a no-flame state, the program detection is qualified. Thirdly, whether the main control board 200 can detect the fire-out condition within a preset time (such as 1s) when the water heater is suddenly turned off is detected, the time is also extremely short, manpower cannot be detected within the short time, the controller 110 controls the first switch unit 121 to start turning off, if the main control board 200 detects that the flame state is a no-flame state within the preset time, the program is detected to be qualified, and if the main control board 200 does not detect that the flame state is the no-flame state within the preset time, the program is detected to be unqualified.

In the above embodiment, the automatic detection device 100 is used to replace the manual detection, and the controller 110 of the automatic detection device 100 precisely controls the required ignition time, so as to accurately simulate the actual ignition process of the water heater, precisely detect whether the main control board 200 of the water heater has a problem in hardware and whether an error occurs in the control program of the water heater, reduce the human detection error, and increase the accuracy of the automatic detection device 100.

In one embodiment, as shown in fig. 2, the ignition flame detection module 120 further includes a first anti-reverse diode D1, a cathode of the first anti-reverse diode D1 is connected to the first end of the first switch unit 121, and an anode of the first anti-reverse diode D1 is used for connecting the high voltage signal output end 210.

The first anti-reverse diode D1 is disposed at the first end of the first switch unit 121, so that the high-voltage ignition signal can be prevented from reversely impacting the high-voltage signal output terminal 210 to damage the circuit of the main control board 200.

In one embodiment, as shown in fig. 2, the ignition flame detection module 120 further includes a first current limiting resistor R1, the first current limiting resistor R1 being connected in series between the cathode of the first anti-reverse diode D1 and the first terminal of the first switching unit 121.

Since the high voltage ignition signal is a signal with high frequency, high voltage and low energy, if such a signal is inputted to the flame feedback receiving circuit 220 for a long time, it may cause damage to the devices in the flame feedback receiving circuit 220, and therefore, a first current limiting resistor R1 is disposed between the first anti-reverse diode D1 and the first end of the first switching unit 121, and the first current limiting resistor R1 is used to relatively stabilize the high voltage ignition signal flowing therethrough.

In one embodiment, as shown in fig. 2, the first switching unit 121 includes a first transistor Q1 and a first relay 1211. The base electrode of the first triode Q1 is connected with the controller 110, and the emitter electrode of the first triode Q1 is grounded; a first end of a coil of the first relay 1211 is connected to a collector of the first transistor Q1, a second end of the coil is used for connecting to the power supply 300, a first contact of the first relay 1211 is used for connecting to the high-voltage signal output end 210, and a second contact of the first relay 1211 is used for connecting to the flame feedback receiving loop 220.

The first relay 1211 is used to control the transmission of the high-voltage ignition signal, and the first transistor Q1 is used to control the on/off of the first relay 1211, where a first contact of the first relay is a first terminal of the first switching unit 121, and a second contact of the first relay is a second terminal of the first switching unit 121. Any I/O interface of the controller 110 is connected to the base of the first transistor Q1, the base of the first transistor Q1 being the third terminal of the first switching unit 121. During the detection process, the controller 110 outputs a voltage to the first triode to enable the first triode Q1 to be conducted, so that the contact of the relay is attracted, and a high-voltage ignition signal can flow from the high-voltage signal output end 210 to the flame feedback receiving loop 220; the controller 110 fails to output a voltage to the first transistor or the output voltage fails to turn on the first transistor Q1, thereby causing the relay contacts to open and the high voltage ignition signal is not received by the flame feedback receiving circuit 220.

In one embodiment, as shown in fig. 2, the first switching unit 121 further includes a second anti-reverse diode D2 connected in parallel with the coil of the first relay 1211, an anode of the second anti-reverse diode D2 is connected to a first end of the coil of the first relay 1211, and a cathode of the second anti-reverse diode D2 is connected to a second end of the coil of the first relay 1211. Wherein the second anti-reverse diode D2 is used to prevent current reversal.

In one embodiment, the main control board 200 of the water heater is provided with a first communication serial port, and the detection device 100 further includes a second communication serial port connected to the controller 110, where the second communication serial port is used for connecting with the first communication serial port. After the main control board 200 detects the flame signal, a feedback signal is sent to the controller 110 to inform the controller 110 of the current flame detection state of the main control board 200, and the controller 110 determines whether the flame detection is qualified according to the current flame detection state of the main control board 200.

In one embodiment, as shown in fig. 3, the automatic detection device 100 further includes a temperature control detection module 130 connected to the controller 110, and the temperature control detection module 130 is configured to be connected to the main control board 200.

Wherein, the temperature detection module is used for detecting the detection of the water temperature detection function of the water heater by the main control panel 200. After the temperature control detection module 130 is connected to the temperature signal receiving terminal of the main control board 200, the controller 110 controls the temperature control detection module 130 to output a temperature analog signal to the main control board 200, after the main control board 200 detects the temperature analog signal, the temperature analog signal is fed back to the controller 110 of the detection device 100, after receiving the temperature analog signal, the main control board 200 with normal function sends a known correct signal to the controller 110 of the detection device 100 from the communication serial port, and the main control board 200 with problems cannot feed back the temperature signal or feed back an incorrect signal.

In one embodiment, as shown in fig. 4, the temperature control detection module 130 includes a charging and discharging unit 131, the charging and discharging unit 131 includes a controlled terminal and a charging voltage output terminal, the controlled terminal is connected to the controller 110, and the charging voltage output terminal is used for being connected to the temperature signal receiving terminal 230 of the main control board 200; the controller 110 is further configured to output a square wave signal with a preset duty ratio to the charging and discharging unit 131, and the charging and discharging unit 131 is configured to perform charging and discharging according to the square wave signal to output a stable voltage signal to the temperature signal receiving end of the main control board 200.

In particular, the prior art typically uses AD values to simulate different temperature signals, and the common formula for AD detection is:

after conversion to voltage, the corresponding voltage is:

wherein R is₀Is a current limiting resistor, R^′ ₀Is a pull-up resistor, and E is a power supply. R is₀And R^′ ₀After the resistance value is fixed, the value output by the final calculation result is generally approximately equal to a certain value, and the mode simulates the change R of the temperature sensor₀To change the signal ultimately sent to the main controller, this voltage signal being an approximation, R₀The resistance value of the AD port cannot be accurately changed according to the detection requirement, if the temperature change value which needs to be changed back and forth is 1 ℃, the AD value detected by the AD port may not be changed, so that the simulated temperature value is not changed. Therefore, the existing temperature analog signal cannot accurately simulate the change value of the actual temperature.

In this embodiment, a square wave signal with a preset duty ratio is output to the charging and discharging unit 131 through the controller 110, when the square wave signal is at a high level, the charging and discharging unit 131 is in a charging state, and at this time, the electrical signal received by the main control board 200 is a charging voltage of the charging and discharging unit 131; when the square wave signal is at a low level, the charging and discharging unit 131 is in a discharging state, and at this time, the electrical signal received by the main control board 200 is a discharging voltage of the charging and discharging unit 131. As long as the frequency of the square wave signal is fast enough, the change of the charging voltage and the discharging voltage of the charging and discharging circuit can be made small enough, so that the output voltage signal is relatively stable. And by controlling the duty ratio of the square wave signal, the charging time and the discharging time of the charging and discharging unit 131 in one period can be controlled, so that the voltage amplitude of the stable voltage output by the charging and discharging unit 131 is controlled to simulate temperature signals of different temperatures, and the stable electric signal is output to the main control board 200.

In one embodiment, the charge and discharge unit 131 includes: a second triode Q2, an electrolytic capacitor C1 and a discharge resistor R2. The base of the second triode Q2 is connected with the controller 110, and the collector of the second triode Q2 is connected with the power supply 300; the first end of the electrolytic capacitor C1 is connected with the emitter of the second triode Q2, the first end of the electrolytic capacitor C1 is a charging voltage output end, and the second end of the electrolytic capacitor C1 is grounded; the discharge resistor R2 is connected in parallel with the electrolytic capacitor C1.

Specifically, as shown in fig. 4, the charging and discharging unit 131 controls the second transistor Q2 to be turned on and off by outputting a square wave signal through the controller 110, so as to control the power supply 300 to charge the electrolytic capacitor C1 and discharge the electrolytic capacitor C1, where the first terminal of the electrolytic capacitor C1 is the charging voltage output terminal. The base of the second triode Q2 is the controlled end of the charging and discharging unit 131, wherein the controller 110 outputs a square wave signal with a preset duty ratio and a preset frequency, the square wave signal flows into the base of the second triode Q2, so that the second triode Q2 is turned on only under a signal within the limit of the duty ratio, and further the power supply 300 can transmit electric quantity to the electrolytic capacitor C1 according to the preset frequency, so that the electrolytic capacitor C1 is charged according to the preset frequency, and the capacitance of the electrolytic capacitor C1 is large enough to completely absorb the electric quantity of the discontinuous power supply and output a stable level signal at the first end of the electrolytic capacitor C1. The discharge resistor R2 is connected in parallel with the electrolytic capacitor C1, and the discharge resistor R2 serves as a discharge load of the electrolytic capacitor C1, so that the electrolytic capacitor C1 can discharge electricity completely after detection is finished. Finally, the power supply 300 changes the preset frequency through the second triode Q2, and then the power supply is subjected to charge-discharge filtering through the electrolytic capacitor C1 to form a stable electric signal which can be identified by the main control board 200, and the controller 110 can adjust the size of the output stable electric signal by changing the duty ratio of the square wave signal.

In one real-time example, a current limiting resistor is also connected in series between the base of the second transistor Q2 and the controller 110 to prevent excessive current flow to the second transistor Q2.

In one embodiment, as shown in fig. 3, the automatic detection device 100 further includes a key function detection module 150 connected to the controller 110, wherein the key function detection module 150 is used to connect to the key spring 410 of the gas water heater.

The key function detecting module 150 detects whether the key function on the display 400 of the gas water heater is normal. The signal output port of the key function detecting module 150 is connected to a key spring 410 of a display 400 on the water heater, the controller 110 controls the key function module to output a key analog signal to the key spring 410 on the display 400, the key spring 410 is a signal input end of an actual key, and is located on either the main control board 200 or the display 400 of the water heater, and the main control board 200 of the water heater receives the key analog signal, and when the key spring 410 is located on the display 400, the main control board 200 is connected to the key spring 410. After receiving the key analog signal, the main control board 200 controls the display 400 to perform corresponding display, if the display content corresponds to the detected key function, the key detection is qualified, and if the display content does not correspond to the detected key function or the display 400 does not respond, the key detection is unqualified.

In one embodiment, as shown in fig. 5, the key function detecting module 150 includes: a second switching unit 151 and a floating ground 152. The second switching unit 151 comprises a fourth end, a fifth end and a sixth end, and the fourth end of the second switching unit 151 is used for connecting the key spring 410 of the gas water heater; a fifth terminal of the second switching unit 151 is connected to the controller 110; the floating ground 152 is connected to the sixth terminal of the second switching unit 151; the controller 110 is further configured to control on/off between the fourth terminal and the sixth terminal of the second switch unit 151, so that the floating ground 152 sends an electrostatic signal to the key spring 410 when the fourth terminal and the sixth terminal are turned on.

Specifically, the existing key detection mode is to directly output an analog signal to the main control board 200 of the water heater, and the main control board 200 feeds the analog signal back to the detection device to make the detection device perform signal comparison, for the touch key, the spring and the touch part of the key are not detected in the process, only whether the main control board 200 has a problem in processing the signal is detected, and if the spring or the touch part in the key has a problem or has interference, the problem cannot be found. In this embodiment, the floating ground 152 is used to simulate the normal use of the water heater by simulating the human body contacting the spring of the touch key. The human body is equivalent to a large capacitor, when the hand touches the key spring 410, the key spring 410 is equivalent to the capacitor connected to the ground, and the floating ground 152 in the automatic detection device 100 is used for simulating the human body, and the electricity in the floating ground 152 generates static electricity accumulation under the condition of no circulation, and is equivalent to the human body in function. The second switch unit 151 controls whether the static electricity in the floating ground 152 is transmitted to the key spring 410 by controlling the on-off between the fourth end and the sixth end, if the fourth end and the sixth end are disconnected, the key spring 410 is disconnected from the floating ground 152, the static electricity in the floating ground 152 cannot be transmitted to the key spring 410 and is received by the main control board 200, which indicates that the key is not used, and if the fourth end and the sixth end are connected, the key spring 410 is connected with the floating ground 152, which means that a human body contacts the key spring 410, and the static electricity in the floating ground 152 is transmitted to the key spring 410 and is received by the main control board 200, which indicates that the key is being used. The rapid mechanized testing of the various functional keys is performed by programming in the controller 110. In one embodiment, the number of the key function modules is multiple, the key function modules can be set according to the number of touch keys of an actual water heater, and the key function modules can detect the keys at the same time, so that the detection efficiency is improved.

In one embodiment, as shown in fig. 5, the first end of the second switch unit 151 and the button spring 410 are connected through a metal clip 153. Since the metal has good conductivity, the metal clip 153 can stably clip the key spring 410 during detection and can be conveniently taken down after detection is finished, the metal clip 153 is arranged at the first end of the second switch unit 151 to conveniently clip the key spring 410.

In one embodiment, the second switching unit 151 includes: a third transistor Q3, and a second relay 1511. The base electrode of the third triode Q3 is connected with the controller 110, and the emitter electrode of the third triode Q3 is grounded; a first end of a coil of the second relay 1511 is connected to a collector of the third transistor Q3, a second end of the coil of the second relay 1511 is used for connecting the power supply 300, a first contact of the second relay 1511 is used for connecting the key spring 410, and a second contact of the second relay 1511 is used for connecting the floating ground 152.

The second relay 1511 is used for controlling the transmission of the electric quantity in the floating ground 152, the second triode Q2 is used for controlling the on-off of the second relay 1511, and any I/O interface of the controller 110 is connected with the base of the second triode Q2. In the detection process, the controller 110 outputs voltage to the second triode Q2 to enable the second triode Q2 to be conducted, so that the contact of the relay is attracted, and the electric quantity in the floating ground 152 can flow to the key spring 410; the controller 110 fails to output a voltage to the transistor or the output voltage fails to turn on the second transistor Q2, thereby causing the relay contacts to open and the key spring 410 to not receive power from the floating ground 152.

In one embodiment, the second switching unit 151 further includes a third anti-reflection diode D3 connected in parallel with the coil of the second relay 1511, an anode of the third anti-reflection diode D3 is connected to a first end of the coil of the second relay 1511, and a cathode of the third anti-reflection diode D3 is connected to a second end of the coil of the second relay 1511. Among them, the third prevention diode 1511 is used to prevent the current from reversing.

In one embodiment, as shown in fig. 3 and 6, the automatic detection device 100 further includes a water flow function detection module 140, the water flow function detection module 140 includes a first flow port 141 connected to the controller 110, the first flow port 141 is used for connecting to a second flow port 240 of the main control board 200, and the controller 110 is further used for sending an inlet water flow signal to the main control board 200 through the first flow port 141 and simultaneously receiving an outlet water flow signal sent by the main control board 200. The water inlet flow signal refers to a cold water flow signal entering the water heater when the water heater is in actual use, and the water outlet flow signal refers to a hot water flow signal flowing out of the water heater when the water heater is in actual use. In the detection process, the controller 110 sends an inlet water flow signal to the main control board 200, and the main control board 200 recognizes the inlet water flow, calculates a theoretical outlet water flow according to the inlet water flow signal and other parameters, and outputs an outlet water flow signal to the controller 110 according to the theoretical outlet water flow. If the main control board 200 can correctly identify the water inlet flow signal and calculate the correct theoretical water outlet flow, the water flow detection and calculation functions of the water heater are qualified, otherwise, the water flow detection and calculation functions are not qualified.

In one embodiment, as shown in fig. 7, the first flow port 141 includes a first flow output port 1411 and a first flow input port 1412, the second flow port 240 of the main control board 200 includes a second flow input port 241 and a second flow output port 242, the first flow output port 1411 is connected to the second flow input port 241, a second current limiting resistor R3 is connected in series between the first flow output port 1411 and the controller 110, the first flow input port 1412 is connected to the second flow output port 242, a third current limiting resistor R4 is connected in series between the first flow input port 1412 and the controller 110, and meanwhile, the third current limiting resistor R4 is connected in parallel to a pull-up resistor R5, and the pull-up resistor R5 is used for pulling up the voltage of the water outflow signal output by the main control board 200.

In one embodiment, as shown in FIG. 8, the automatic detection device 100 further comprises an alarm device 160 coupled to the controller 110. When the detection device 100 detects that the current detection item is not qualified, the controller 110 controls the alarm device 160 to give an alarm. The alarm device 160 may be any alarm device capable of reminding the detecting person, for example, a buzzer.

In one embodiment, as shown in FIG. 8, the automatic detection device 100 further comprises a display device 170 connected to the controller 110. The display device 170 is used for displaying the step of the unqualified detection items in the detection process, and in the automatic detection process, the controller 110 continuously detects different detection items according to the program steps, if the unqualified detection items are detected, the detection personnel may not know which detection item has a problem, and the display device 170 displays the unqualified items so that the detection personnel can quickly know which function of the main control board 200 has a problem. If the detection device 100 detects that the current detection item is not qualified, the detection can be stopped, the step of the unqualified detection item is displayed through the display device 170, or all functions can be detected, the unqualified functions are sequentially displayed in the detection process, and the functional problems of the main control board 200 can be checked at one time. In some embodiments, the display device 170 may employ, but is not limited to, a digital tube display 400 or an LED display 400.

In one embodiment, the automatic detection device 100 has the flame detection function module, the temperature control detection module 130, the button function detection module 150, and the water flow function detection module 140. In the process of detecting all functions, a detector accesses the signal output ports of the modules to the corresponding functional signal ports on the main control board 200 to electrify the main control board 200, the controller 110 controls different detection modules to send various signals corresponding to the main control board 200 according to signals generated in the actual use process of the water heater, and the main control board 200 acts according to the various signals sent by the controller 110 according to the control program of the main control board and transmits the signals corresponding to the current state of the main control board through the communication serial port. Specifically, the controller 110 first transmits a water flow signal to the main control board 200, and if the main control board 200 detects that the water flow corresponding to the water flow signal is greater than the start water flow, the main control board 200 starts to ignite. After ignition is started, the main control board 200 sends a high-voltage ignition signal to the ignition needle of the high-voltage signal output end 210, the first end of the first switch unit 121 is connected with the ignition needle, flame detection is performed at the moment, if the flame detection is unqualified, other set functions can not be detected, if the flame detection is qualified, the flame signal is always given and all set functions are normally detected, for example, the controller 110 sequentially changes the water flow, the inlet/outlet water temperature, the presence or absence of a water signal, the flame signal extinguishment, the power-on water protection and other signals according to the program, at this time, the controller 110 respectively outputs signals corresponding to different functions to the main control panel 200 according to the preset program, if the function detection is not qualified, the flame signal is stopped, the display device displays the current detection position, after the detection personnel press the confirmation key, the main control board 200 resends the high-voltage ignition signal to simulate ignition, and the unqualified condition is confirmed after the detection is carried out again. If all the functions are detected to be qualified, the completion state is displayed in the display device, and the next main control board 200 is replaced for detection.

Because the transmission rate of signal of telecommunication is very fast, the check-out time of every main control unit 110 and display 400 is very short, and the mistake appears in the detection midway then interrupt at once and detect and show wrong step, carry out accurate location to the wrong position, the manpower only needs to do not stop and change next board and can a plurality of devices of concurrent operation, take out the board when the mistake appears in the testing process, later in unison according to the device display content reprocesses, reduce the error of artificial detection when accelerating the production rhythm.

In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean 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 utility model. In this specification, schematic depictions of the above terms do not necessarily refer to the same embodiment or example.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. The automatic detection device of the gas water heater is characterized by comprising a main control board, wherein the main control board is provided with a high-voltage signal output end and is used for generating a high-voltage ignition signal and outputting the high-voltage ignition signal from the high-voltage signal output end; the main control board is also provided with a flame feedback receiving loop for receiving a flame signal; the automatic detection device includes:

the ignition flame detection module comprises a first switch unit, the first switch unit comprises a first end, a second end and a third end, the first end of the first switch unit is used for being connected with the high-voltage signal output end to receive the high-voltage ignition signal, and the second end of the first switch unit is used for being connected with a flame feedback receiving loop of the main control panel;

and the controller is connected with the third end of the first switch unit and is used for controlling the on-off between the first end and the second end of the first switch unit so as to feed back the high-voltage ignition signal to the flame feedback receiving loop as the flame signal when the first end and the second end are conducted.

2. The automatic detection device of the gas water heater according to claim 1, wherein the ignition flame detection module further comprises a first anti-reverse diode, a cathode of the first anti-reverse diode is connected with the first end of the first switch unit, and an anode of the first anti-reverse diode is used for connecting the high-voltage signal output end.

3. The automatic detection device of a gas water heater of claim 2, wherein the ignition flame detection module further comprises a first current limiting resistor connected in series between a negative electrode of the first anti-reverse diode and the first end of the first switching unit.

4. The automatic detection device of a gas water heater according to claim 1, wherein said first switching unit comprises:

the base electrode of the first triode is connected with the controller, and the emitting electrode of the first triode is grounded;

the first end of the coil of the first relay is connected with the collector electrode of the first triode, the second end of the coil is used for being connected with a power supply, the first contact of the first relay is used for being connected with the high-voltage signal output end, and the second contact of the first relay is used for being connected with the flame feedback receiving loop.

5. The automatic detection device of a gas water heater according to claim 4, wherein the first switch unit further comprises a second anti-reverse diode connected in parallel with the coil of the first relay, an anode of the second anti-reverse diode is connected with the first end of the coil of the first relay, and a cathode of the second anti-reverse diode is connected with the second end of the coil of the first relay.

6. The automatic detection device of a gas water heater according to claim 1, further comprising a temperature control detection module connected to the controller, the temperature control detection module being configured to be connected to the main control board.

7. The automatic detection device of the gas water heater according to claim 6, wherein the temperature control detection module comprises a charge and discharge unit, the charge and discharge unit comprises a controlled end and a charging voltage output end, the controlled end is connected with the controller, and the charging voltage output end is used for being connected with a temperature signal receiving end of the main control panel; the controller is further used for outputting a square wave signal with a preset duty ratio to the charging and discharging unit, and the charging and discharging unit is used for charging and discharging according to the square wave signal so as to output a stable voltage signal to a temperature signal receiving end of the main control board.

8. The automatic detection device of a gas water heater according to claim 7, wherein said charge and discharge unit comprises:

a base electrode of the second triode is connected with the controller, and a collector electrode of the second triode is connected with a power supply;

the first end of the electrolytic capacitor is connected with the emitter of the second triode, the first end of the electrolytic capacitor is the charging voltage output end, and the second end of the electrolytic capacitor is grounded;

and the discharge resistor is connected with the electrolytic capacitor in parallel.

9. The automatic detection device of a gas water heater according to claim 1, further comprising a key function detection module connected to the controller, the key function detection module being used to connect a key spring of the gas water heater.

10. The automatic detection device of a gas water heater according to claim 9, wherein said key function detection module comprises:

the second switch unit comprises a fourth end, a fifth end and a sixth end, and the fourth end of the second switch unit is used for connecting a key spring of the gas water heater; the fifth end of the second switch unit is connected with the controller;

the floating ground is connected with the sixth end of the second switch unit;

the controller is further used for controlling the on-off of the fourth end and the sixth end of the second switch unit, so that the floating ground sends an electrostatic signal to the key spring when the fourth end and the sixth end are conducted.

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