WO2019144655A1 - 用于蒸汽炉的水位检测设备及方法、蒸汽炉 - Google Patents

用于蒸汽炉的水位检测设备及方法、蒸汽炉 Download PDF

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Publication number
WO2019144655A1
WO2019144655A1 PCT/CN2018/110851 CN2018110851W WO2019144655A1 WO 2019144655 A1 WO2019144655 A1 WO 2019144655A1 CN 2018110851 W CN2018110851 W CN 2018110851W WO 2019144655 A1 WO2019144655 A1 WO 2019144655A1
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WIPO (PCT)
Prior art keywords
water
detecting
water tank
indication signal
water level
Prior art date
Application number
PCT/CN2018/110851
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English (en)
French (fr)
Inventor
何春华
钟广雄
黎青海
郑年重
覃承勇
Original Assignee
广东美的厨房电器制造有限公司
美的集团股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority claimed from CN201810064354.0A external-priority patent/CN108088529A/zh
Priority claimed from CN201810064923.1A external-priority patent/CN108267193A/zh
Application filed by 广东美的厨房电器制造有限公司, 美的集团股份有限公司 filed Critical 广东美的厨房电器制造有限公司
Publication of WO2019144655A1 publication Critical patent/WO2019144655A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields

Definitions

  • the invention relates to the field of steam furnaces, in particular to a water level detecting device and method for a steam furnace, and a steam furnace.
  • the water level detection methods for steam boiler water tanks mainly include buoy type and probe type, and both are contact type measuring methods.
  • the buoy method is usually based on the principle of electromagnetic or Hall effect to complete the water level detection, generally only two files, used to detect high and low water levels.
  • the probe method is based on the principle of capacitance to complete the water level detection. The number of detection positions depends on the number of probes.
  • Chinese patent application CN101495930A discloses a non-contact type water level control device comprising at least one capacitive sensor disposed on an outer surface of a side wall of a water tank, and controlled to supply to the water tank according to a change in the amount of capacitance sensed by the capacitive sensor The amount of water.
  • both the buoy type and the probe type method are contact type detecting methods, that is, the float or the metal probe must be placed in the water box, which is difficult to clean, It is easy to pollute the water source; (2) the buoy type method is difficult to complete the multi-level water level detection, and the detection result is rough; (3) the probe type method leads to complicated water tank structure design, troublesome circuit leads, and is inconvenient for the user to take out the water and also Increase the cost of manufacturing; (4)
  • the capacitance detection module of the non-contact water level control device needs to be close to the side wall of the water tank, and the water tank of the steam furnace needs to be taken out frequently, if the circuit detection module is installed on the side wall of the water tank, it is easy Splashing or being bumped by water, and the circuit leads can lead to a very complicated structural design, so it is not suitable for steam ovens.
  • an embodiment of the present invention provides a water level detecting apparatus for a steam furnace, the apparatus comprising: detecting means disposed on an inner wall of a water tank mounting portion of the steam furnace for detecting the steam Whether there is water at one or more predetermined positions of the water tank of the furnace, and generating an indication signal of whether there is water at each of the predetermined positions; and control means for determining water of the steam furnace according to the indication signal The water level of the box.
  • the apparatus comprises one or more of the detecting devices, wherein each of the detecting devices comprises: a detecting module comprising a light emitting element and a light receiving element, the light emitting element and the light a receiving element is disposed at an intersection and an angle between the light emitting element and the light receiving element has a preset angle; and a circuit module for detecting an intensity of light received by the light receiving element, and according to the light Receiving, by the intensity of the light received by the receiving component, the indication signal; and the control means for determining a water level state of the water tank of the steam furnace according to the indication signal respectively output by the one or more detecting devices, wherein Each of the detecting modules is fixed at a different position on an inner wall of the water cartridge mounting portion, and each of the detecting modules is located at a different height, and the predetermined position corresponds to the detecting module at the The position on the inner wall of the water tank mounting portion.
  • the device further includes: a circuit board, the one or more detecting devices are fixed on an inner wall of the water cartridge mounting portion through the circuit board; and the detecting device further comprises: a package seat, the package a seat is fixed on the circuit board, and the package seat is provided with two holes, the light emitting element is disposed in one of the two holes, and the light receiving element is disposed on the two Inside another hole in the hole.
  • an angle between the light emitting element and the light receiving element is an angle between a light emitting end of the light emitting element and a light receiving end of the light receiving element, the preset The angle ranges from 50° to 70°, preferably 60°; and/or a stepped layout is employed between the detection modules.
  • the circuit module includes: a detecting circuit configured to output different voltages in response to different intensities of light received by the light receiving elements; and a micro control unit configured to: output a voltage at the detecting circuit When it is greater than the preset value, the output indicates an indication signal indicating that there is no water; and in the case where the voltage output by the detection circuit is not greater than the preset value, an indication signal indicating that there is water is output.
  • the detecting circuit comprises: a power source and a first resistor connected in series with the light emitting element; and a second resistor connected in series with the light receiving element.
  • the detecting circuit further includes: a filter connected in parallel with the second resistor and composed of a capacitor and a resistor.
  • the detecting module is an infrared pair tube
  • the light emitting element is an infrared emitting diode
  • the light receiving element is an infrared receiving diode.
  • the detecting device comprises: a circuit board, one side of the circuit board is attached to an inner wall of the water tank mounting portion of the steam furnace; and is covered on the other side of the circuit board and vertically Arranging one or more pieces of copper foil respectively forming a capacitance with the earth, wherein the predetermined position corresponds to a position of the copper foil on an inner wall of the water tank mounting portion; capacitance detection The device is configured to detect a capacitance value of each of the one or more copper foils and the capacitors formed by the ground, and output the indication signal according to the capacitance values of the capacitors at the corresponding output ports; the control device is used to Determining a water level state of a water tank of the steam furnace according to the indication signal output by the capacitance detecting device.
  • the capacitance detecting device is configured to: when the detected capacitance value is greater than a predetermined value, output an indication signal indicating that water is present at a corresponding output port; and the detected capacitance value is not greater than the predetermined In the case of a value, an indication signal indicating no water is output at the corresponding output port.
  • control device is further configured to: if the received indication signals all indicate no water, determine whether the received indication signal all indicates that the water is not present for a predetermined time; if the received indication signal All of the indications that no water has been continued for the predetermined time, then controlling the prompting device to issue a related prompt that the water cartridge is not installed; and if the received indication signal all indicates no water, the predetermined time is not continued And controlling the prompting device to issue a prompt for adding water to the water box.
  • an interval between adjacent copper foils of the one or more copper foils is not less than 5 mm, and an area of each of the one or more copper foils is not less than 200 mm 2 , preferably not less than 300 mm 2 ; and/or each of the one or more copper foils has a rectangular shape.
  • the device further includes: a display device, the control device is further configured to control the display device to display a water level state of the water tank; and/or a prompting device, the control device is further configured to be in the In the case that the water level of the water tank reaches the warning value, the prompting device is controlled to issue a prompt.
  • an embodiment of the present invention further provides a steam furnace, the above-described water level detecting device for a steam furnace.
  • an embodiment of the present invention further provides a water level detecting method for a steam furnace, the steam furnace comprising the water level detecting device for a steam furnace according to the above, the method comprising: detecting a water tank of the steam furnace Whether there is water at one or more predetermined positions, and generating an indication signal of whether there is water at each of the predetermined positions; and determining a water level state of the water tank of the steam furnace according to the indication signal.
  • the steam oven comprises a water level detecting device for a steam furnace according to any one of claims 9 to 13, wherein the one or more predetermined positions of the water tank of the steam furnace are detected Whether there is water and outputting an indication signal indicating whether there is water at each of the predetermined positions includes: detecting a capacitance value of each of the capacitors composed of one or more copper foils and the ground; and outputting according to the capacitance values of the capacitors The indication signal.
  • the outputting the corresponding level signal according to the capacitance value of each capacitor includes: outputting an indication signal indicating that water is present if the detected capacitance value is greater than a predetermined value; and detecting the capacitance value In the case where it is not larger than the predetermined value, an indication signal indicating that there is no water is output.
  • the method further comprises: displaying a water level state of the water tank; and/or issuing a prompt if the water level of the water tank reaches an early warning value.
  • each component in the water level detecting device is not in direct contact with the water tank, and not only the non-contact water level measurement can be realized, but also the damage caused by the water splashing or being collided by each component can be prevented.
  • FIG. 1 is a block diagram showing the structure of a water level detecting device for a steam furnace according to an embodiment of the present invention
  • FIG. 2 shows a side view of a water level detecting apparatus for a steam furnace according to an embodiment of the present invention
  • FIG. 3 shows a plan view of a water level detecting apparatus for a steam furnace according to an embodiment of the present invention
  • FIG. 4 is a plan view showing a water level detecting device for a steam furnace according to another embodiment of the present invention.
  • Figure 5 shows a schematic diagram of a circuit module
  • FIG. 6 is a schematic structural view of a water level detecting device for a steam furnace according to another embodiment of the present invention.
  • Figure 7 is a view showing the structure of the water tank and the water tank mounting portion
  • FIG. 8 is a flow chart showing a water level detecting method of a steam furnace according to an embodiment of the present invention.
  • Embodiments of the present invention provide a water level detecting device for a steam furnace, which may include a detecting device and a control device.
  • the detecting device may be disposed on an inner wall of the water tank mounting portion of the steam furnace, and may be used to detect whether there is water at one or more predetermined positions of the water tank of the steam furnace, and generate water at each predetermined position. Indication signal.
  • the control device can be configured to determine the water level of the water tank of the steam oven based on the indication signal generated by the detection device.
  • the predetermined position may be a position corresponding to the height of any water level of the water tank selected according to requirements, for example, the height position of the water tank corresponding to the water level height of 25%, 50% and/or 75%.
  • the components in the water level detecting device are not in direct contact with the water tank, and not only non-contact water level measurement but also various components can be prevented. Damage caused by being sprayed with water or being hit by a collision.
  • the water level detecting device for a steam furnace may include: one or more detecting devices 100 fixed on an inner wall of a water tank mounting portion of the steam furnace, wherein each detecting device includes: a detecting module 110
  • the detecting module 110 includes a light emitting element 111 and a light receiving element 112, the light emitting element 111 and the light receiving element 112 are disposed at an intersection and an angle between the light emitting element 111 and the light receiving element 112 Having a preset angle such that an angle between the light emitted from the light emitting element 111 and the received light of the light receiving element 112 has the predetermined angle; and a circuit module 120 for detecting light received by the light receiving element 112 Intensity, and outputting a corresponding indication signal according to the intensity of the light received by the light receiving element 112; and the control device 200 determining the water level state of the water tank according
  • the indication signal can indicate whether the water tank is water or not at the corresponding position of the detection module 110, so the control device 200 can determine the water level state of the water tank according to the indication information of each indication signal.
  • the indication signal is taken as an example, wherein the high level signal is used to indicate that there is water, and the low level signal is used to indicate that there is no water.
  • the components in the water level detecting device are not in direct contact with the water tank, and not only can the non-contact water level measurement be realized, but also the damage caused by splashing water or being collided with each component can be prevented, and the device can be quickly Accurately detect the water level of the water tank in real time.
  • the intensity of the light received by the light receiving element is different. Specifically, if there is no water in the water tank at the corresponding position of the detecting module 110, the outgoing light of the light emitting element 111 will be mostly reflected by the water tank side wall, so that the light receiving element 112 can receive the light emitting element 111. Most of the light, and thus the intensity of the light received by the light receiving element 112, is high.
  • the light emitted from the light emitting element 111 is mostly refracted or absorbed by the water, so that the light receiving element 112 skillfully receives a very small portion of the light, so that the light receiving element 112
  • the intensity of the received light is low. Therefore, whether or not there is water in the water cartridge at the corresponding position of the detecting module 110 can be determined according to the intensity of the light received by the light receiving element 112, so that the intensity of the light received by the light receiving element 112 at different height positions can be used. Determine the water level of the water tank.
  • Each of the detecting modules 110 may preferably be fixed at different height positions of the same inner wall of the water tank mounting portion, and the container wall material of at least a portion adjacent to the detecting module 110 in the water tank is transparent, for example, the water tank may be a transparent plastic water tank. Wait.
  • the angle between the light emitting element 111 and the light receiving element 112 is an angle between the light emitting end of the light emitting element 111 and the light receiving end of the light receiving element 112.
  • the detecting module 110 may be an infrared pair tube, and the light emitting element 111 is an infrared emitting diode, and the light receiving element 112 is an infrared receiving diode.
  • the angle between the infrared emitting diode and the infrared receiving diode is an angle between the lamp beads of the two.
  • the angle between the light emitting end of the light emitting element 111 and the light receiving end of the light receiving element 112 in the embodiment of the present invention may range from 50° to 70°, preferably 60°. That is, the angle between the fixed light-emitting element 111 and the plane of the inner wall of the water tank mounting portion of the steam furnace may range from 55° to 65°, preferably 60°, and the fixed light-receiving element 111 and The angle of the plane of the inner wall of the water tank mounting portion of the steam furnace may range from -55° to -65°, preferably -60°; or the fixed light-emitting element 111 and the water tank mounting portion of the steam furnace The angle of the plane of the inner wall may range from -55° to -65°, preferably to -60°, and the angle between the fixed light receiving element 111 and the plane of the inner wall of the water tank mounting portion of the steam furnace may be -55° to -65°, preferably 60°.
  • the light emitting element 111 and the light receiving element 112 have a fixed preset angle to ensure that the light emitted from the light emitting element 111 can be accurately received by the light receiving element 112 in the same detecting module 110, thereby enhancing the receiving of the light receiving element 112.
  • the intensity of light increases the sensitivity of detection.
  • the water level detecting device for the steam furnace provided by the embodiment of the present invention will be further described below by taking the detecting module 110 as an infrared pair tube, the light emitting element 111 as an infrared emitting diode, and the light receiving element 112 as an infrared receiving diode.
  • FIG. 2 shows a side view of a water level detecting apparatus for a steam furnace according to an embodiment of the present invention.
  • the water tank 130 can be horizontally withdrawn and inserted from the water tank mounting portion 140, and the infrared pair tube 150 can be fixed.
  • the infrared pair tube 150 can be fixed at different height positions of the inner wall of the water cartridge mounting portion 140.
  • a stepped layout may be adopted between the infrared pair tubes 150.
  • the infrared pair tubes 150 may be fixed on the same side wall of the water tank mounting portion 140. Upper, and a stepped layout is adopted on the same inner wall.
  • FIG. 3 shows a top view of a water level detecting apparatus for a steam oven in accordance with an embodiment of the present invention.
  • the infrared pair tube 150 is preferably fixed on the same inner wall of the water tank mounting portion 140.
  • the angle between the lamp of the infrared emitting diode and the lamp of the infrared receiving diode is The range may be from 50 to 70, preferably may be 60.
  • the infrared pair tube 150 may be fixed to the inner wall of the water tank mounting portion 140 through the circuit board 160.
  • one side of the circuit board 160 may be attached to the inner wall of the water tank mounting portion 140, and the infrared pair tube 150 may be welded. The other side of the circuit board 160.
  • the number of infrared pair tubes 150 and the mounting position can be determined by the number of gear positions detected by the required water level. For example, if four gear positions are to be set, the four gear positions are 25%, 50%, 75%, and 100, respectively. %, four infrared pair tubes 150 can be soldered on the circuit board, and the four infrared pair tubes 150 correspond to 25%, 50%, 75%, and 100% of the height of the water tank, respectively, from low to high, and 4
  • the infrared pair tube 150 can be in a stepped layout.
  • the gear position may be set according to the number and position of the infrared pair tube 150, for example, if the circuit board is covered with 4 infrared pair tubes 150, and the 4 infrared pair tubes 150 correspond to low to high respectively. At 25%, 50%, 75%, and 100% of the height of the water tank, four gear positions can be set, which are 25%, 50%, 75%, and 100%, respectively.
  • the water level detecting apparatus for a steam furnace may further include: a package base 170 soldered on the circuit board for fixing the infrared emitting diode and the infrared receiving diode, and the package base extends out of the circuit board.
  • the length of 170 may be less than or equal to the length of the infrared emitting diode and the infrared receiving diode extending out of the circuit board 170.
  • the package holder 170 is provided with two penetrating holes, and the infrared emitting diode is disposed in one of the holes (the inclination angle of the hole with respect to the circuit board 170 is the same as the inclination angle of the infrared emitting diode with respect to the circuit board 170), and the light receiving is performed.
  • the component is disposed within the other of the apertures (the angle of inclination of the aperture relative to the circuit board 170 coincides with the angle of inclination of the infrared receiving diode relative to the circuit board 170).
  • the shape of the package holder 170 may be arbitrary, for example, it may be composed of two hollow cylinders, two hollow elliptical cylinders or two hollow rectangular parallelepipeds.
  • the shape of the hole in the package seat 170 may also be arbitrary, for example, may be elliptical, rectangular, or the like, or the shape of the hole may be consistent with the shape of the lamp bead of the infrared emitting diode and the bead of the infrared diode.
  • the package seat can fix the lamp beads of the infrared emitting diode and the lamp beads of the infrared receiving diode to prevent the lamp bead from shaking during normal use, and can also prevent optical crosstalk between different infrared pair tubes 150 and improve reliability.
  • Figure 5 shows a schematic of a circuit module.
  • the circuit module may include a detecting circuit and a micro control unit MCU, wherein the detecting circuit may include: a power supply connected in series with the infrared emitting diode D1 and a resistor R1, the power supply voltage may be 5V, and the resistor R1 is an infrared emitting diode D1 dividing resistors, infrared light emitting diode D1 emit signal intensity magnitude associated with the current I 1, the larger the light signal current I 1 infrared emitting diodes D1 larger emission intensity.
  • the detecting circuit may further include: a resistor R2 connected in series with the infrared receiving diode D2, and a resistor R3 and a capacitor C3 connected in parallel with the resistor R2, wherein the resistor R3 and the capacitor C3 are connected in series.
  • the MCU is used to measure the output voltage V adc of the detection circuit, and the resistor R2 is a charging resistor. When the infrared receiving diode D2 receives the optical signal, it outputs a large current I 2 .
  • V adc R 2 *I 2 , so the value of V adc can be judged to determine the strength of the infrared received signal.
  • Resistor R 3 and capacitor C 3 form a first-order low-pass filter for filtering unwanted high-frequency noise signals.
  • smoothing filtering can be used in the MCU to process the received voltage signal.
  • the MCU can determine that there is no water at the height position of the infrared tube in the water tank, and the MCU outputs an indication signal indicating that there is no water, for example, the output can be low. Flat signal "0".
  • the MCU can determine that there is water at the height position where the infrared tube is located in the water tank, and the MCU output indicates that there is water indication.
  • the signal for example, can output a high level "1".
  • each infrared pair tube can detect whether there is water at a height corresponding to the water tank, that is, one water level detection can be performed through an infrared pair tube, and if water level detection of multiple gear positions is to be performed, only It is necessary to add a plurality of infrared pair tubes and corresponding multiple circuit modules.
  • R 1 , R 2 , R 3 , and C 3 can be 1k ⁇ , 100k ⁇ , 10k ⁇ , and 1 ⁇ F, respectively, and the voltage preset value can be set to 2V, and the MCU supply voltage is 5V.
  • the MCU can output five kinds of level signals, which are respectively "0000", “0001", “0011”, “0111", and "1111".
  • the water level states corresponding to the five level signals are respectively lower than 25%", “above 25% and below 50%”, “above 50% and below 75%”, “above 75% and below 100%”, “100%”, of which high level “1" indicates water, and low level “0" indicates no water.
  • the control device can respond to the level signal, the corresponding water level state.
  • the water level detection method and result greater than 4 files are similar, and will not be described here.
  • Fig. 6 is a view showing the structure of a water level detecting device for a steam furnace according to another embodiment of the present invention.
  • the detecting device may include: a circuit board 620, one side of the circuit board 620 may be attached to the water box of the steam furnace.
  • the predetermined position in the embodiment of the present invention corresponds to the position of the copper foil 630 on the inner wall of the water cartridge mounting portion 660, that is, after the water cartridge 610 is mounted on the water cartridge mounting portion 660, the water cartridge 610 corresponds to the copper foil 630.
  • the position is the predetermined position; the capacitance detecting device 640 is configured to detect the capacitance values of the capacitors formed by the one or more copper foils 630 and the ground respectively, and output the corresponding output ports according to the capacitance values of the capacitors.
  • Corresponding level signal The control device 650 can receive the indication signal output by the capacitance detecting device 640 and determine the water level state of the water cartridge 610 based on the indication signal.
  • the indication signal can indicate whether there is water or no water at the position of the water tank corresponding to each copper foil 630, so the control device 650 can determine the water level state of the water tank according to the indication signal.
  • the indication signal is taken as an example, wherein the high level signal is used to indicate that there is water, and the low level signal is used to indicate that there is no water.
  • the height of the circuit board 620 can be greater than or equal to the height of the water tank 610, preferably the same height as the water tank.
  • One side of the circuit board 620 may be adhered to the inner wall of the water tank mounting portion 660 by adhesive, and the bottom of the circuit board 620 may be at the same level as the bottom of the water tank 610 when pasting.
  • the other side of the circuit board 620 is covered with a copper foil 630.
  • the copper foil 630 is mounted toward the side wall of the water tank, wherein the copper foil 630 may be evenly arranged vertically, or may be arranged as needed instead of being evenly arranged.
  • the circuit board 620 may be a PCB (Printed Circuit Board) board, but the embodiment of the present invention is not limited thereto.
  • the shape of the copper foil 630 may be a rectangular parallelepiped.
  • the number and mounting position of the copper foil 630 may be determined by the number of gear positions detected by the required water level. For example, if four gear positions are to be set, the four gear positions are respectively 25 %, 50%, 75%, and 100%, the circuit board can be covered with 4 copper foils 630, and the 4 copper foils 630 correspond to 25%, 50%, 75% of the height of the water tank, respectively, from low to high. And 100%.
  • the gear position may be set according to the number and position of the copper foil 630, for example, if the circuit board is covered with four copper foils 630, and the four copper foils 630 correspond to the water tank from low to high respectively. At 25%, 50%, 75%, and 100% of the height, four gear positions can be set, which are 25%, 50%, 75%, and 100%, respectively.
  • the copper foil 630 is one plate of the capacitor, and the ground is the other plate, and the small capacitance between the two plates varies with the area of the copper foil 630 and the electrolyte between the two plates. change. Since the capacitance is relatively small, in order to increase the detection sensitivity and the signal-to-noise ratio, the area of the copper foil 630 should be not less than 200 mm 2 , preferably not less than 300 mm 2 , and the interval between adjacent copper foils 630 is preferably not less than 5 mm.
  • a solder resist liquid such as a solder resist oil or the like may be coated on the copper foil 630 to prevent the copper foil 630 from being exposed to air for a long time to cause an oxidation effect, and to avoid copper. A short circuit between the foils 630.
  • the copper foil 630 can be electrically connected to the capacitance detecting device 640, for example, can be electrically connected to the capacitance detecting device 640 through a wire, wherein the circuit board 620 can be provided with a hole so that the wire can connect the copper foil 630 and the capacitor through the hole. Detection device 640.
  • the water tank 610 is used to supply a water source to the steam generator of the steam furnace.
  • part of the container wall material adjacent to the copper foil 630 of the water tank 610 should be insulated or non-conductive.
  • the water tank 610 can be Plastic water box.
  • the capacitance detecting device 640 monitors the magnitude of the capacitance value to determine whether there is water at the corresponding position.
  • the capacitance detecting device 640 can perform amplification filtering on the detected current signal to improve the measurement accuracy.
  • the capacitance detecting device 640 may have a multi-stage filtering and amplifying function.
  • the detected capacitance value is greater than a predetermined value, it may be determined that there is water at a position corresponding to the corresponding copper foil 630.
  • the predetermined value may be adjusted as needed, or a predetermined value may be adjusted by soldering different external resistors.
  • the capacitance detecting device 640 may include a capacitance detecting chip and an output port, and the copper foil 630 corresponds to an output port of each capacitor composed of the earth.
  • the output port can be, for example, an I/O output port, a UART digital interface, or an IIC digital interface.
  • the capacitance detecting chip can detect the capacitance values of the respective capacitors composed of the copper foil 630 and the ground in real time. If the detected capacitance value is greater than the predetermined value, the high level can be outputted at the corresponding output port to indicate the corresponding position of the water tank.
  • the control device 650 can receive the level signal output by each output port and determine the water level state of the water tank based on the received level signal.
  • the level signals "0000”, “0001”, “0011”, “0111”, " The water level status corresponding to 1111” is "less than 25%", “above 25% and below 50%”, “higher than 50% and lower than 75%”, “higher than 75% and lower than 100%” "100%”, wherein a high level "1” indicates that there is water, and a low level "0" indicates that there is no water.
  • FIG. 7 shows a schematic structural view of the water tank 610 and the water tank mounting portion 660.
  • the water tank 610 can be horizontally withdrawn from the water tank mounting portion 660 and can be horizontally pushed into the mounting portion 660.
  • the water tank 610 and the copper foil are The gap between 630 should be no greater than the preset gap value so that a capacitance can be generated between the copper foil and the ground, which can be, for example, 2 mm. If the water tank 610 is not installed, the gap between the water tank 610 and the copper foil is greater than the preset gap value.
  • the capacitance detecting device will not detect the capacitance, and then pass the output.
  • the level signals output by the port to the control device are all low.
  • the control device determines whether the received level signals are all low level for a predetermined time. If the predetermined time has elapsed, it is indicated by the water tank. The installation is not in place and the capacitance detecting device does not detect the capacitance. In this case, the control device can control the prompting device to issue a prompt that the water cartridge is not installed, and the user can detect the water cartridge to install the water cartridge in place according to the prompt. If the received level signal is all low level, the control device may normally determine the water level state of the water tank, and may control the display device to display the corresponding water level state, and control the prompting device to emit water. The box needs to be added with water.
  • the control device can determine that the water in the water tank has a height of less than 25%, and can control the display device to display information about the current water level less than 25%, and The control prompting device prompts the user to add water.
  • the control prompting device prompts the user to add water.
  • the user can add water to the water tank, and insert the water tank filled with water into the water tank mounting portion.
  • the capacitance detecting device continuously outputs all The low level signal, the control device continues to receive all level signals that are low level. If the water tank is installed in place, the level signals output by the capacitance detecting device will not be all low level, and the control device receives the level signals no longer all low.
  • the capacitance detecting device will continue to output level signals that are all low level, and the control device continues to receive all level signals that are low level, and therefore, according to the received level signal
  • the duration of the case where all is low is used to determine if the water cartridge is in place.
  • the preset time may be greater than the maximum time required for the user to add water to the water tank, and the maximum time required for the user to add water to the water tank may be obtained through experimental statistics.
  • the embodiment of the present invention is described by taking four copper foils on the circuit board, and the four copper foils 630 are respectively corresponding to 25%, 50%, 75%, and 100% of the height of the water tank.
  • the high level "1" indicates that there is water
  • the low level "0" indicates that there is no water.
  • the special IC chip of Saiyuan Microelectronics SCW8916 is used as a capacitance detecting device for detecting the small capacitance.
  • the chip has four channels. With 4kV EFT and 6kV contact ESD capability, it can pass 3V CS test. It is possible to measure four capacitors of four copper foils and a ground using one chip, and multiple chips in the case of more than four copper foils.
  • the four copper foils are evenly distributed in the vertical direction.
  • the output level of the four I/O ports of the chip is “0000”, and 25%, 50%, 75%, 100%
  • the water level output levels are “0001”, “0011”, “0111”, and “1111”, respectively, thus achieving multi-level water level detection.
  • the control device can control the display device to display the corresponding water level state, so as to facilitate the user to know the water level state in the water tank in time.
  • the control device can judge whether the water cartridge is not installed in place according to the duration of the received level of "0000", if the water tank is not installed In place, you can control the prompting device to issue a prompt for the water tank not being installed.
  • the control device may also control the prompting device to issue a prompt for water shortage if the water level value reaches the warning value. For example, if the warning value is set to 50%, the control device may receive the level signal as “0011”. In the case of the control prompting device, the relevant prompt for less water is issued. If the control device further receives the level signal "0001", the prompting device may be controlled to issue a prompt for water shortage.
  • the water level detection method and results greater than 4 files are similar, and are not described here.
  • the components in the water level detecting device are not in direct contact with the water tank, and not only the non-contact water level measurement but also the damage caused by the splashing of water or being collided by the components can be prevented.
  • the non-contact water level detection there is no need to design any design of the water tank, which reduces the manufacturing cost.
  • the device provided by the embodiment of the present invention may further include a display device and/or a prompting device, wherein the control device may further control the display device to display the water level state of the water tank, and if the water level state of the water box reaches the early warning value
  • the control prompting device issues a prompt for water shortage.
  • the display device and the prompting device may be integrated with the control device, for example, the functions performed by the control device, the display device, and the prompting device may be performed by the control panel.
  • the control device may control the prompting device to issue a prompt for less water if the received level signal is "0011", if the control device further receives the level signal " 0001", it can control the prompting device to issue a prompt for water shortage.
  • the prompting device may be an audible alert device or the like, or may be prompted by the display device.
  • a text prompt or a flashing prompt may be sent through the display device, and the user may add water to the water cartridge according to the prompt issued by the prompting device.
  • the display device and the prompting device may be integrated with the control device, for example, the functions performed by the control device, the display device, and the prompting device may be performed by the control panel.
  • an embodiment of the present invention further provides a steam furnace, which may include the water level detecting device for a steam furnace provided by any of the above embodiments of the present invention.
  • an embodiment of the present invention further provides a water level detecting method for a steam furnace, which may include a water level detecting device for a steam furnace according to any embodiment of the present invention, the method comprising: detecting a Whether there is water at one or more predetermined positions of the water tank of the steam furnace, and generating an indication signal of whether there is water at each of the predetermined positions; and determining a water level of the water tank of the steam furnace according to the indication signal status. It can realize non-contact water level measurement, and it can also prevent damage caused by splashing water or being collided.
  • FIG. 8 is a flow chart showing a water level detecting method of a steam furnace according to an embodiment of the present invention.
  • the water level detecting method for a steam furnace provided by the embodiment of the present invention may include: detecting a capacitance value of each capacitor formed by one or more copper foils and the ground; and according to the capacitance values of the capacitors Outputting a corresponding indication signal; and determining a water level state of the water tank according to the indication signal. It can realize non-contact water level measurement, and it can also prevent damage caused by splashing water or being collided.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

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Abstract

一种用于蒸汽炉的水位检测设备，包括：检测装置（100），设置在蒸汽炉的水盒安装部的内壁上，用于检测蒸汽炉的水盒的一个或多个预定位置处是否有水，并生成每个预定位置处是否有水的指示信号；以及控制装置（200），用于根据指示信号确定蒸汽炉的水盒的水位状态。该水位检测设备中的各部件均没有与水盒直接接触，不仅可以实现非接触式水位测量，而且还可以防止各部件被溅射上水或被碰撞而引起的损坏。还公开了包括该水位检测设备的蒸汽炉，以及用于蒸汽炉的水位检测方法。

Description

用于蒸汽炉的水位检测设备及方法、蒸汽炉 技术领域
本发明涉及蒸汽炉领域，具体地，涉及一种用于蒸汽炉的水位检测设备及方法、蒸汽炉。
背景技术
目前，蒸汽炉水盒水位检测方法主要有浮标式和探针式，两种都是接触式测量方法。浮标式方法通常是基于电磁或霍尔效应等原理来完成水位检测，一般只有两档，用于检测高、低水位。探针式方法是基于电容原理来完成水位检测，检测档位的多少依赖于探针的多少。
中国专利申请CN101495930A公开了一种非接触型水位控制装置，其包括至少一个电容性传感器，其设置在水箱侧壁的外表面上，根据电容性传感器感测到的额电容变化而控制供应到水箱的水量。
本申请发明人在实施上述现有技术的过程中发现：(1)浮标式和探针式方法均为接触式检测方法，也就是说浮子或金属探针必须放置水盒中，这样不易清洁，并容易污染水源；(2)浮标式方法难以完成多档水位检测，且检测结果比较粗糙；(3)探针式方法导致水盒结构设计复杂、电路引线麻烦、且不方便用户取出加水、还增加生产制造的成本；(4)非接触型水位控制装置中电容检测模块需要紧贴水箱侧壁，而蒸汽炉的水盒需要经常取出加水，若电路检测模块安装在水盒侧壁，则容易被水溅射、或者被碰撞，此外电路引线会导致结构设计非常复杂，因此不适用于蒸汽炉。
发明内容
本发明实施例的目的是提供一种用于蒸汽炉的水位检测设备及方法、蒸汽炉，用于解决或至少部分解决上述技术问题。
为了实现上述目的，本发明实施例提供一种用于蒸汽炉的水位检测设备，所述设备包括：检测装置，设置在所述蒸汽炉的水盒安装部的内壁上，用于检测所述蒸汽炉的水盒的一个或多个预定位置处是否有水，并生成每个所述预定位置处是否有水的指示信号；以及控制装置，用于根据所述指示信号确定所述蒸汽炉的水盒的水位状态。
可选地，所述设备包括一个或多个所述检测装置，其中每个所述检测装置包括： 检测模块，所述检测模块包括光发射元件和光接收元件，所述光发射元件和所述光接收元件交叉设置且所述光发射元件和所述光接收元件之间的夹角具有预设角度；以及电路模块，用于检测所述光接收元件所接收的光的强度，并根据所述光接收元件所接收的光的强度输出所述指示信号；以及所述控制装置用于根据所述一个或多个检测装置各自输出的所述指示信号确定所述蒸汽炉的水盒的水位状态，其中，每一所述检测模块固定在所述水盒安装部的内壁上的不同位置处，且每一所述检测模块所处的高度均不相同，所述预定位置对应于所述检测模块在所述水盒安装部的内壁上的位置。
可选地，所述设备还包括：电路板，所述一个或多个检测装置通过该电路板固定在所述水盒安装部的内壁上；以及所述检测装置还包括：封装座，该封装座固定在所述电路板上，且所述封装座上设置有两个孔，所述光发射元件设置在所述两个孔中的一个孔内，所述光接收元件设置在所述两个孔中的另一个孔内。
可选地，所述光发射元件和所述光接收元件之间的夹角为所述光发射元件的光发射端和所述光接收元件的光接收端之间的夹角，所述预设角度的范围为50°至70°，优选为60°；和/或所述检测模块之间采用阶梯式布局。
可选地，所述电路模块包括：检测电路，用于响应于所述光接收元件所接收的光的不同强度而输出不同的电压；微控单元，用于：在所述检测电路输出的电压大于预设值的情况下，输出表示指示无水的指示信号；以及在所述检测电路输出的电压不大于所述预设值的情况下，输出表示指示有水的指示信号。
可选地，所述检测电路包括：与所述光发射元件串联连接的电源和第一电阻；以及与所述光接收元件串联连接的第二电阻。
可选地，所述检测电路还包括：与所述第二电阻并联连接且由电容和电阻构成的滤波器。
可选地，所述检测模块为红外对管，所述光发射元件为红外发射二极管，所述光接收元件为红外接收二极管。
可选地，所述检测装置包括：电路板，所述电路板的一侧贴合在所述蒸汽炉的水盒安装部的内壁上；覆盖在所述电路板另一侧之上且竖向排列的一块或多块铜箔，所述一块或多块铜箔分别与大地组成电容，其中，所述预定位置对应于所述铜箔在所述水盒安装部的内壁上的位置；电容检测装置，用于检测所述一块或多块铜箔分别与大地组成的各电容的电容值，并根据所述各电容的电容值在对应的输出端口输出所述指示信号；所述控制装置用于根据所述电容检测装置输出的所述指示信号来确定所述蒸汽炉的水 盒的水位状态。
可选地，所述电容检测装置用于：在所检测的电容值大于预定值的情况下，在对应的输出端口输出指示有水的指示信号；以及在所检测的电容值不大于所述预定值的情况下，在对应的输出端口输出指示无水的指示信号。
可选地，所述控制装置还用于：在所接收的指示信号全部指示无水的情况下，判断所接收的指示信号全部指示无水的情况是否已持续预定时间；如果所接收的指示信号全部指示无水的情况已持续所述预定时间，则控制所述提示装置发出所述水盒未安装到位的有关提示；以及如果所接收的指示信号全部指示无水的情况未持续所述预定时间，则控制所述提示装置发出所述水盒需加水的有关提示。
可选地，所述一块或多块铜箔中相邻铜箔之间的间隔不小于5mm，且所述一块或多块铜箔中每一块铜箔的面积不小于200mm 2，优选不小于300mm 2；和/或所述一块或多块铜箔中每一块铜箔的形状为长方形。
可选地，所述设备还包括：显示装置，所述控制装置还用于控制所述显示装置显示所述水盒的水位状态；和/或提示装置，所述控制装置还用于在所述水盒的水位达到预警值的情况下，控制所述提示装置发出提示。
相应地，本发明实施例还提供一种蒸汽炉，所述蒸汽炉上述的用于蒸汽炉的水位检测设备。
相应地，本发明实施例还提供一种用于蒸汽炉的水位检测方法，所述蒸汽炉包括根据上述的用于蒸汽炉的水位检测设备，所述方法包括：检测所述蒸汽炉的水盒的一个或多个预定位置处是否有水，并生成每个所述预定位置处是否有水的指示信号；以及根据所述指示信号确定所述蒸汽炉的水盒的水位状态。
可选地，所述蒸汽炉包括根据权利要求9至13中任意一项权利要求所述的用于蒸汽炉的水位检测设备，所述检测所述蒸汽炉的水盒的一个或多个预定位置处是否有水，并输出每个所述预定位置处是否有水的指示信号包括：检测一块或多块铜箔分别与大地组成的各电容的电容值；以及根据所述各电容的电容值输出所述指示信号。
可选地，所述根据所述各电容的电容值输出对应的电平信号包括：在所检测的电容值大于预定值的情况下，输出指示有水的指示信号；以及在所检测的电容值不大于所述预定值的情况下，输出指示无水的指示信号。
可选地，所述方法还包括：显示所述水盒的水位状态；和/或在所述水盒的水位达到预警值的情况下，发出提示。
通过上述技术方案，水位检测设备中的各部件均没有与水盒直接接触，不仅可以实现非接触式水位测量，而且还可以防止各部件被溅射上水或被碰撞而引起的损坏。
本发明实施例的其它特征和优点将在随后的具体实施方式部分予以详细说明。
附图说明
图1示出了根据本发明一实施例的用于蒸汽炉的水位检测设备的结构框图；
图2示出了根据本发明一实施例的用于蒸汽炉的水位检测设备的侧视图；
图3示出了根据本发明一实施例的用于蒸汽炉的水位检测设备的俯视图；
图4示出了根据本发明另一实施例的用于蒸汽炉的水位检测设备的俯视图；
图5示出了电路模块的示意图；
图6示出了根据本发明另一实施例的用于蒸汽炉的水位检测设备的结构示意图；
图7示出了水盒和水盒安装部的结构示意图；以及
图8示出了根据本发明一实施例的蒸汽炉的水位检测方法流程示意图。
具体实施方式
以下结合附图对本发明实施例的具体实施方式进行详细说明。应当理解的是，此处所描述的具体实施方式仅用于说明和解释本发明实施例，并不用于限制本发明实施例。
本技术领域技术人员可以理解，本实用新型的说明书中使用的措辞“包括”是指存在上述特征、整数、步骤、操作、元件和/或组件，但是并不排除存在或添加一个或多个其他特征、整数、步骤、操作、元件、组件和/或它们的组合。应该理解，当我们称元件被“电性连接”或“耦接”到另一元件时，它可以直接连接或耦接到其他元件，或者也可以存在中间元件。此外，这里使用的“电性连接”或“耦接”可以包括无线连接或无线耦接。这里使用的措辞“和/或”包括一个或更多个相关联的列出项的全部或任一单元和全部组合。
本发明实施例提供一种用于蒸汽炉的水位检测设备，该设备可以包括检测装置和控制装置。检测装置可以设置在所述蒸汽炉的水盒安装部的内壁上，并可以用于检测蒸汽炉的水盒的一个或多个预定位置处是否有水，并生成每个预定位置处是否有水的指示信号。控制装置可以用于根据检测装置生成的指示信号来确定蒸汽炉的水盒的水位状态。其中预定位置可以根据需要选取的水盒任意水位高度对应的位置，例如可以是水位高度为25％、50％和/或75％时对应的水盒的高度位置。通过将检测装置设置在所述蒸汽炉的 水盒安装部的内壁上，使得水位检测设备中的各部件均没有与水盒直接接触，不仅可以实现非接触式水位测量，而且还可以防止各部件被溅射上水或被碰撞而引起的损坏。
图1示出了根据本发明一实施例的用于蒸汽炉的水位检测设备的结构框图。如图1所示，用于蒸汽炉的水位检测设备可以包括：一个或多个检测装置100，固定在所述蒸汽炉的水盒安装部的内壁上，其中每一检测装置包括：检测模块110，所述检测模块110包括光发射元件111和光接收元件112，所述光发射元件111和所述光接收元件112交叉设置且所述光发射元件111和所述光接收元件112之间的夹角具有预设角度，以使得光发射元件111出射光和光接收元件112的接收光之间的角度具有所述预设角度；以及电路模块120，用于检测所述光接收元件112所接收的光的强度，并根据所述光接收元件112所接收的光的强度输出对应的指示信号；以及控制装置200，根据所述一个或多个检测装置100各自输出的指示信号确定所述水盒的水位状态，其中，每一所述检测模块110在所述水盒安装部的内壁上的不同位置处，且每一所述检测模块所处的高度均不相同，上述的预定位置可以对应于每一检测模块110在所述水盒安装部的内壁上的位置，也就是说，水盒安装置于水盒安装部后，水盒上与检测模块110对应的位置即为预定位置。指示信号可以指示水盒在检测模块110的对应位置处是有水还是无水，因此控制装置200可以根据各指示信号的指示信息来确定水盒的水位状态。在本发明实施例中，是以指示信号为电平信号为例进行说明的，其中，高电平信号用于指示有水，低电平信号用于指示无水。水位检测设备中的各部件均没有与水盒直接接触，不仅可以实现非接触式水位测量，而且还可以防止各部件被溅射上水或被碰撞而引起的损坏，此外，所述设备能够快速、准确地实时检测出水盒的水位状态。
在水盒的对应位置处有水或无水时，光接收元件所接收到的光的强度是不同的。具体地，如果水盒中在检测模块110的对应位置处无水，则光发射元件111的出射光将大部分被水盒侧壁反射，使得光接收元件112能够接收到从光发射元件111出射的大部分光，从而光接收元件112所接收的光的强度较高。如果水盒中在检测模块110的对应位置处有水，则光发射元件111的出射光大部分被水折射或吸收，使得光接收元件112技能接收到极少部分的光，从而光接收元件112所接收的光的强度较低。因此，可以根据光接收元件112所接收的光的强度来判断水盒中在检测模块110的对应位置处是否有水，从而可以根据不同高度位置处的光接收元件112所接收的光的强度来确定水盒的水位状态。
各检测模块110优选可以固定在水盒安装部的同一内壁的不同高度位置处，水盒 中至少与检测模块110邻近的部分的容器壁材料是透明的，例如水盒可以是透明的塑料水盒等。
光发射元件111和光接收元件112之间的夹角为光发射元件111的光发射端和光接收元件112的光接收端之间的夹角，例如，检测模块110可以为红外对管，光发射元件111为红外发射二极管，光接收元件112为红外接收二极管，则在本发明实施例中，红外发射二极管和红外接收二极管之间的夹角为二者的灯珠之间的夹角。可选地，本发明实施例中光发射元件111的光发射端和光接收元件112的光接收端之间的夹角的角度范围可以为50°至70°，优选可以为60°。也就是说，固定后的光发射元件111与蒸汽炉的水盒安装部的内壁所在平面的夹角的范围可以为55°至65°，优选为60°，而固定后的光接收元件111与蒸汽炉的水盒安装部的内壁所在平面的夹角的范围可以为-55°至-65°，优选为-60°；或者，固定后的光发射元件111与蒸汽炉的水盒安装部的内壁所在平面的夹角的范围可以为-55°至-65°优选为-60°，而固定后的光接收元件111与蒸汽炉的水盒安装部的内壁所在平面的夹角的范围可以为-55°至-65°，优选为60°。光发射元件111和光接收元件112之间具有固定的预设角度，可以保证同一检测模块110中，光发射元件111的出射光能够准确被光接收元件112接收，从而增强光接收元件112所接收的光的强度，提高检测灵敏度。
下面将以检测模块110为红外对管、光发射元件111为红外发射二极管、光接收元件112为红外接收二极管为例，对本发明实施例提供的用于蒸汽炉的水位检测设备进行进一步说明。
图2示出了根据本发明实施例的用于蒸汽炉的水位检测设备的侧视图，如图2所示，水盒130可以从水盒安装部140水平抽出和插入，红外对管150可以固定在水盒安装部140的内壁的不同高度位置处。可选地，为将各红外对管150之间的光信号串扰降至最低，红外对管150之间可以采用阶梯式布局，优选红外对管150可以固定在水盒安装部140的同侧内壁上，且在该同侧内壁上采用阶梯式布局。
图3示出了根据本发明实施例的用于蒸汽炉的水位检测设备的俯视图。如图3所示，红外对管150优选固定在水盒安装部140的同侧内壁上，同一红外对管150中，红外发射二极管的灯珠和红外接收二极管的灯珠之间的夹角的范围可以为50°至70°，优选可以为60°。红外对管150可以通过电路板160固定在水盒安装部140的内壁上，具体地，电路板160的一侧可以贴合在水盒安装部140的内壁上，红外对管150可以被焊接在电路板160的另一侧。
红外对管150数量和安装位置可以由所需的水位检测的档位的数量来确定，例如，如果需设置四个档位，该四个档位分别是25％、50％、75％和100％，则电路板上可以焊接有4个红外对管150，且该4个红外对管150从低到高分别对应于水盒高度的25％、50％、75％和100％，且4个红外对管150可以采用阶梯式布局。或者，反过来，也可以根据红外对管150的数量和位置来设置档位，例如，如果电路板上覆盖有4个红外对管150，且该4个红外对管150从低到高分别对应于水盒高度的25％、50％、75％和100％，则可以设置四个档位，该四个档位分别是25％、50％、75％和100％。
图4示出了根据本发明另一实施例的用于蒸汽炉的水位检测设备的俯视图。如图4所示，本发明实施例提供的用于蒸汽炉的水位检测设备还可以包括：焊接在电路板上用于固定红外发射二极管和红外接收二极管的封装座170，封装座伸出电路板170的长度可以小于或等于红外发射二极管和红外接收二极管伸出电路板170的长度。封装座170上设置有两个穿透的孔，红外发射二极管设置在其中一个孔(该孔相对于电路板170的倾斜角度与红外发射二极管相对于电路板170的倾斜角度一致)内，光接收元件设置在其中另一个孔(该孔相对于电路板170的倾斜角度与红外接收二极管相对于电路板170的倾斜角度一致)内。封装座170的形状可以是任意的，例如，可以是由两个空心圆柱体、两个空心椭圆柱体或两个空心长方体等组成。封装座170上的孔的形状也可以是任意的，例如，可以是椭圆形、长方形等，或者，孔的形状可以与红外发射二极管的灯珠和红外二极管的灯珠的形状保持一致。封装座可以固定红外发射二极管的灯珠和红外接收二极管的灯珠，防止正常使用过程中灯珠的晃动，并且还可以防止不同红外对管150之间的光串扰，提高可靠性。
图5示出了电路模块的示意图。如图5所示，电路模块可以包括检测电路和微控单元MCU，其中，检测电路可以包括：与红外发射二极管D1串联连接的电源和电阻R1，电源电压可以是5V，电阻R1为红外发射二极管D1分压电阻，红外发射二极管D1发射的光信号强度的大小与电流I 1相关，电流I 1越大红外发射二极管D1发射的光信号强度越大。进一步，检测电路还可以包括：与红外接收二极管D2串联连接的电阻R2，以及与电阻R2并联连接的电阻R3和电容C3，其中，电阻R3和电容C3串联连接。MCU用于测量检测电路的输出电压V adc，电阻R2为充电电阻，当红外接收二极管D2接收到光信号时，则输出较大的电流I 2，由于MCU的管脚输入电阻非常大，因此电流I 2几乎从R 2中流走，形成电压，电压值为V adc＝R 2*I 2，因此判断V adc的值即可判断红外接收信号的强弱。电阻R 3和电容C 3构成一个一阶低通滤波器，用于滤除无用的高频噪 声信号。此外，为了进一步抑制噪声波动，MCU中可以采用平滑滤波对接收的电压信号进行处理。
具体地，当水盒中红外对管所处的高度位置处无水时，则红外发射二极管发射的大部分光信号均被水盒侧壁反射，因此红外接收二极管产生的电流I 2较大，从而V adc也较大，当该电压大于预设值时，则MCU可以确定水盒中红外对管所处的高度位置处无水，MCU输出指示无水的指示信号，例如，可以输出低电平信号“0”。当水盒中红外对管所处的高度位置处有水时，则红外发射二极管发射的大部分光信号被水折射或吸收，被返回至红外接收二极管的光信号极少，则导致红外接收二极管产生的电流I 2较小，从而V adc也较小，当该电压小于预设值时，则MCU可以确定水盒中红外对管所处的高度位置处有水，MCU输出指示有水的指示信号，例如，可以输出高电平“1”。这样，通过每一红外对管可以检测水盒对应的一个高度处是否有水，也就是说，通过一个红外对管可以执行一档的水位检测，若要执行多个档位的水位检测，仅需添加多个红外对管和对应的多个电路模块即可。
具体实施时，R 1、R 2、R 3、C 3可以分别为1kΩ、100kΩ、10kΩ和1μF，电压预设值可以设置为2V，MCU供电电压为5V。以4档水位检测为例，使用呈阶梯式排列的4个红外对管，4个红外对管的设置位置分别对应于水盒高度的25％、50％、75％和100％。当无水时，MCU可以输出五种电平信号，分别为“0000”“0001”、“0011”、“0111”、“1111”，这五种电平信号分别对应的水位状态为“低于25％”、“高于25％而低于50％”、“高于50％而低于75％”、“高于75％而低于100％”、“100％”，其中，高电平“1”表示有水，低电平“0”表示无水。从而，控制装置可以根据所接收到额电平信号，对应的水位状态。大于4档的水位检测方法和结果类似，在此不再赘述。
图6示出了根据本发明另一实施例的用于蒸汽炉的水位检测设备的结构示意图。如图6所示，本发明实施例提供的用于蒸汽炉的水位检测设备中，检测装置可以包括：电路板620，所述电路板620的一侧可以贴合在所述蒸汽炉的水盒610的水盒安装部660的内壁上；覆盖在所述电路板620另一侧之上且竖向排列的一块或多块铜箔630，所述一块或多块铜箔630分别与大地组成电容，其中本发明实施例中的预定位置对应于铜箔630在水盒安装部660的内壁上的位置，即水盒610安装于水盒安装部660后，水盒610上与铜箔630与对应的位置即为预定位置；电容检测装置640，用于检测所述一块或多块铜箔630分别与大地组成的各电容的电容值，并根据所述各电容的电容值在对应的输出端口输出对应的电平信号。控制装置650可以接收所述电容检测装置640输出的指示 信号，并根据所述指示信号确定水盒610的水位状态。指示信号可以指示各铜箔630对应的水盒位置处是有水还是无水，因此控制装置650就可以根据指示信号来确定水盒的水位状态。在本发明实施例中，是以指示信号为电平信号为例进行说明的，其中，高电平信号用于指示有水，低电平信号用于指示无水。
电路板620的高度可以大于或等于水盒610的高度，优选可与水盒的高度相同。电路板620的一侧可以通过黏胶而被粘贴在所述水盒安装部660的内壁上，在进行粘贴时，电路板620的底部可以与水盒610的底部位于同一水平面。在电路板620另一侧覆盖有铜箔630，相当于，铜箔630是朝向水盒侧壁安装的，其中铜箔630可以是均匀竖向排列的，也可以是根据需要而非均匀排列的。此外，电路板620可以是PCB(Printed Circuit Board，印刷电路板)板，但是本发明实施例并不限制于此。
铜箔630的形状可以是长方体，铜箔630的数量和安装位置可以由所需的水位检测的档位的数量来确定，例如，如果需设置四个档位，该四个档位分别是25％、50％、75％和100％，则电路板上可以覆盖有4块铜箔630，且该4块铜箔630从低到高分别对应于水盒高度的25％、50％、75％和100％。或者，反过来，也可以根据铜箔630的数量和位置来设置档位，例如，如果电路板上覆盖有4块铜箔630，且该4块铜箔630从低到高分别对应于水盒高度的25％、50％、75％和100％，则可以设置四个档位，该四个档位分别是25％、50％、75％和100％。
在执行水位检测时，铜箔630是电容的一个极板，大地是另一个极板，两个极板之间的微小电容随着铜箔630的面积和两个极板之间的电解质变化而改变。由于电容比较小，为了增加检测灵敏度和信噪比，铜箔630的面积应不小于200mm 2，优选不小于300mm 2，并且相邻铜箔630之间的间隔优选不小于5mm。此外，在对铜箔630进行加工时，可以在铜箔630上涂布阻焊液，例如，阻焊油等，以防止铜箔630长时间裸露在空气中发生氧化效应，并且还可以避免铜箔630之间的短路。
铜箔630可以电性连接至电容检测装置640，例如可以通过导线电性连接至电容检测装置640，其中，电路板620上可以设置有孔，以使得导线可以穿过孔连接铜箔630和电容检测装置640。
水盒610是用于给蒸汽炉的蒸汽发生器提供水源，为了实现电容检测，水盒610与铜箔630邻近的部分容器壁材料应是绝缘的或者非导电的，例如，水盒610可以是塑料水盒。
通过上述方案，由于空气的相对介电常数接近1，而水的相对介电常数约为81.5， 因此，当对应位置处有水或无水时，铜箔和大地构成的电容的电容值差别较大，通过电容检测装置640来监测电容值的大小就可以判断对应位置处是否有水。
由于铜箔与大地之间的电容非常微小，则电容检测装置640可以对所检测到的电流信号进行放大滤波，以提高测量精度。例如，电容检测装置640可以具有多级滤波和放大功能，当检测到的电容值大于预定值的情况下，则可以确定出相应的铜箔630所对应的位置处有水。可以根据需要，对所述预定值进行调整，也可以通过焊接不同的外置电阻来调整预定值。
电容检测装置640可以包括电容检测芯片和输出端口，铜箔630与大地组成的每一电容对应一输出端口。所述输出端口例如可以是I/O输出端口、UART数字接口或IIC数字接口。电容检测芯片可以实时检测各铜箔630与大地组成的各电容的电容值，如果所检测的电容值大于预定值，则可以在对应的输出端口输出高电平，以指示水盒的对应位置处有水，如果所检测的电容值不大于预定值，则可以在对应的输出端口输出低电平，以指示水盒的对应位置处无水。控制装置650可以接收各输出端口输出的电平信号，并根据所接收的电平信号确定水盒的水位状态。以4块铜箔从低到高分别对应于水盒高度的25％、50％、75％和100％为例，则电平信号“0000”“0001”、“0011”、“0111”、“1111”分别对应的水位状态为“低于25％”、“高于25％而低于50％”、“高于50％而低于75％”、“高于75％而低于100％”、“100％”，其中，高电平“1”表示有水，低电平“0”表示无水。
图7示出了水盒610和水盒安装部660的结构示意图。如图7所示，水盒610可以从水盒安装部660水平抽出和可以水平推入安装部660内，在水盒610被推入至水盒安装部660内之后，水盒610与铜箔630之间的间隙应不大于预设间隙值，以使得铜箔与大地之间可以产生电容，所述预设间隙值例如可以是2mm。如果水盒610安装不到位，则水盒610与铜箔之间的间隙大于预设间隙值，在用户启动蒸汽炉之后，尽管水盒满水，电容检测装置将检测不到电容，则通过输出端口向控制装置输出的电平信号全部为低电平。
控制装置在所接收的电平信号全部是低电平的情况下，判断所接收的电平信号全部是低电平的情况是否已持续预定时间，如果已持续预定时间，则说明是由于水盒安装不到位而引起电容检测装置检测不到电容，这种情况下，控制装置可以控制提示装置发出关于水盒未安装到位的提示，用户根据该提示可以检测水盒将水盒安装到位。如果所接收的电平信号全部是低电平的情况未持续所述预定时间，则控制装置可以正常确定水 盒的水位状态，并可以控制显示装置显示对应的水位状态，并控制提示装置发出水盒需加水的有关提示，例如，如果最低档位是25％，则控制装置可以确定水盒中水的高度已低于25％，可以控制显示装置显示有关当前水位少于25％的信息，并控制提示装置提示用户进行加水，用户在接收到该提示的情况下可以对水盒进行加水，并将加满水的水盒插入到水盒安装部内，这段时间内电容检测装置持续输出全部是低电平的电平信号，控制装置持续接收全部是低电平的电平信号。如果水盒安装到位，则电容检测装置输出的电平信号将不再全部是低电平，控制装置接收到电平信号不再全部是低电平。如果水盒未安装到位，则电容检测装置将继续持续输出全部是低电平的电平信号，控制装置继续持续接收全部是低电平的电平信号，因此，可以根据所接收的电平信号全部是低电平的情况的持续时间来判断水盒是否安装到位。其中，所述预设时间可以大于用户给水盒加水所需的最大时间，用户给水盒加水所需的最大时间可以通过实验统计获得。
下面以电路板上覆盖有4块铜箔，且该4块铜箔630从低到高分别对应于水盒高度的25％、50％、75％和100％为例，对本发明实施例进行说明，其中，高电平“1”表示有水，低电平“0”表示无水，采用赛元微电子SCW8916专用IC芯片作为电容检测装置来进行微小电容的检测，该芯片有4个通道，拥有4kV EFT和6kV接触ESD能力，可通过3V CS测试。可以采用一颗芯片对4块铜箔与大地组成的4个电容进行测量，多于4块铜箔的情况下可采用多个芯片。4块铜箔在垂直方向平均分布，当无水或水盒安装不到位时，芯片的4个I/O口输出电平为“0000”，而25％、50％、75％、100％的水位输出电平分别为“0001”、“0011”、“0111”、“1111”，从而实现了多档水盒水位检测。控制装置在接收到上述各电平时，可以控制显示装置显示对应的水位状态，以方便用户及时了解水盒中的水位状态。
其中，如果控制装置接收到的电平为“0000”，如上文所述，控制装置可以根据接收到的电平为“0000”的持续时间来判断水盒是否安装不到位，如果水盒安装不到位，则可以控制提示装置发出水盒安装不到位的有关提示。控制装置也可以在水位值达到预警值的情况下，控制提示装置发出缺水的有关提示，例如，如果预警值设置的是50％，则控制装置可以在接收到的电平信号为“0011”的情况下，控制提示装置发出少水的有关提示，如果控制装置进一步接收到电平信号“0001”，则可以控制提示装置发出缺水的有关提示。大于4档的水位检测方法和结果类似，这里不在赘述。
通过上述实施例，水位检测设备中的各部件均没有与水盒直接接触，不仅可以实现非接触式水位测量，而且还可以防止各部件被溅射上水或被碰撞而引起的损坏。此外， 由于为非接触式水位检测，因此无需对水盒进行任何加工设计，降低了制造成本。
进一步地，本发明实施例提供的设备还可以包括显示装置和/或提示装置，其中，控制装置还可以控制显示装置显示水盒的水位状态，以及在水盒的水位状态达到预警值的情况下，控制提示装置发出缺水的有关提示。显示装置、提示装置可以与控制装置集成在一起，例如，可以由控制面板来执行控制装置、显示装置和提示装置所执行的功能。
例如，如果预警值设置的是50％，则控制装置可以在接收到的电平信号为“0011”的情况下，控制提示装置发出少水的有关提示，如果控制装置进一步接收到电平信号“0001”，则可以控制提示装置发出缺水的有关提示。所述提示装置可以是声音提示装置等，或者可以通过显示装置来发出提示，例如，通过显示装置发出文字提示或闪烁提示等，用户可以根据提示装置发出的提示对水盒进行加水。显示装置、提示装置可以与控制装置集成在一起，例如，可以由控制面板来执行控制装置、显示装置和提示装置所执行的功能。
相应地，本发明实施例还提供一种蒸汽炉，该蒸汽炉可以包括本发明上述任意实施例提供的用于蒸汽炉的水位检测设备。
相应地，本发明实施例还提供一种用于蒸汽炉的水位检测方法，所述蒸汽炉可以包括本发明任意实施例所述的用于蒸汽炉的水位检测设备，所述方法包括：检测所述蒸汽炉的水盒的一个或多个预定位置处是否有水，并生成每个所述预定位置处是否有水的指示信号；以及根据所述指示信号确定所述蒸汽炉的水盒的水位状态。其可以实现非接触式水位测量，而且还可以防止各部件被溅射上水或被碰撞而引起的损坏。
图8示出了根据本发明一实施例的蒸汽炉的水位检测方法流程示意图。如图8所示，本发明实施例提供的用于蒸汽炉的水位检测方法，可以包括：检测一块或多块铜箔分别与大地组成的各电容的电容值；根据所述各电容的电容值输出对应的指示信号；以及根据所述指示信号确定水盒的水位状态。其可以实现非接触式水位测量，而且还可以防止各部件被溅射上水或被碰撞而引起的损坏。
本发明实施例提供的用于蒸汽炉的水位检测方法的具体工作原理与益处与上述本发明实施例提供的用于蒸汽炉的水位检测设备的具体工作原理及益处相似，这里将不再赘述。
以上结合附图详细描述了本发明实施例的可选实施方式，但是，本发明实施例并不限于上述实施方式中的具体细节，在本发明实施例的技术构思范围内，可以对本发明实施例的技术方案进行多种简单变型，这些简单变型均属于本发明实施例的保护范围。
另外需要说明的是，在上述具体实施方式中所描述的各个具体技术特征，在不矛盾的情况下，可以通过任何合适的方式进行组合。为了避免不必要的重复，本发明实施例对各种可能的组合方式不再另行说明。
本领域技术人员可以理解实现上述实施例方法中的全部或部分步骤是可以通过程序来指令相关的硬件来完成，该程序存储在一个存储介质中，包括若干指令用以使得单片机、芯片或处理器(processor)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。
此外，本发明实施例的各种不同的实施方式之间也可以进行任意组合，只要其不违背本发明实施例的思想，其同样应当视为本发明实施例所公开的内容。

Claims (18)

  1. 一种用于蒸汽炉的水位检测设备，其特征在于，所述设备包括：
    检测装置，设置在所述蒸汽炉的水盒安装部的内壁上，用于检测所述蒸汽炉的水盒的一个或多个预定位置处是否有水，并生成每个所述预定位置处是否有水的指示信号；以及
    控制装置，用于根据所述指示信号确定所述蒸汽炉的水盒的水位状态。
  2. 根据权利要求1所述的设备，其特征在于，
    所述设备包括一个或多个所述检测装置，其中每个所述检测装置包括：
    检测模块，所述检测模块包括光发射元件和光接收元件，所述光发射元件和所述光接收元件交叉设置且所述光发射元件和所述光接收元件之间的夹角具有预设角度；以及
    电路模块，用于检测所述光接收元件所接收的光的强度，并根据所述光接收元件所接收的光的强度输出所述指示信号；以及
    所述控制装置用于根据所述一个或多个检测装置各自输出的所述指示信号确定所述蒸汽炉的水盒的水位状态，
    其中，每一所述检测模块固定在所述水盒安装部的内壁上的不同位置处，且每一所述检测模块所处的高度均不相同，所述预定位置对应于所述检测模块在所述水盒安装部的内壁上的位置。
  3. 根据权利要求2所述的设备，其特征在于，
    所述设备还包括：电路板，所述一个或多个检测装置通过该电路板固定在所述水盒安装部的内壁上；以及
    所述检测装置还包括：封装座，该封装座固定在所述电路板上，且所述封装座上设置有两个孔，所述光发射元件设置在所述两个孔中的一个孔内，所述光接收元件设置在所述两个孔中的另一个孔内。
  4. 根据权利要求2所述的设备，其特征在于，
    所述光发射元件和所述光接收元件之间的夹角为所述光发射元件的光发射端和所 述光接收元件的光接收端之间的夹角，所述预设角度的范围为50°至70°，优选为60°；和/或
    所述检测模块之间采用阶梯式布局。
  5. 根据权利要求2所述的设备，其特征在于，所述电路模块包括：
    检测电路，用于响应于所述光接收元件所接收的光的不同强度而输出不同的电压；以及
    微控单元，用于：在所述检测电路输出的电压大于预设值的情况下，输出表示指示无水的指示信号；以及在所述检测电路输出的电压不大于所述预设值的情况下，输出表示指示有水的指示信号。
  6. 根据权利要求5所述的设备，其特征在于，所述检测电路包括：
    与所述光发射元件串联连接的电源和第一电阻；以及
    与所述光接收元件串联连接的第二电阻。
  7. 根据权利要求6所述的设备，其特征在于，所述检测电路还包括：
    与所述第二电阻并联连接且由电容和电阻构成的滤波器。
  8. 根据权利要求2所述的设备，其特征在于，所述检测模块为红外对管，所述光发射元件为红外发射二极管，所述光接收元件为红外接收二极管。
  9. 根据权利要求2所述的设备，其特征在于，
    所述检测装置包括：
    电路板，所述电路板的一侧贴合在所述蒸汽炉的水盒安装部的内壁上；
    覆盖在所述电路板另一侧之上且竖向排列的一块或多块铜箔，所述一块或多块铜箔分别与大地组成电容，其中，所述预定位置对应于所述铜箔在所述水盒安装部的内壁上的位置；
    电容检测装置，用于检测所述一块或多块铜箔分别与大地组成的各电容的电容值，并根据所述各电容的电容值在对应的输出端口输出所述指示信号；
    所述控制装置用于根据所述电容检测装置输出的所述指示信号来确定所述蒸汽炉 的水盒的水位状态。
  10. 根据权利要求9所述的设备，其特征在于，所述电容检测装置用于：
    在所检测的电容值大于预定值的情况下，在对应的输出端口输出指示有水的指示信号；以及
    在所检测的电容值不大于所述预定值的情况下，在对应的输出端口输出指示无水的指示信号。
  11. 根据权利要求9所述的设备，其特征在于，所述控制装置还用于：
    在所接收的指示信号全部指示无水的情况下，判断所接收的指示信号全部指示无水的情况是否已持续预定时间；
    如果所接收的指示信号全部指示无水的情况已持续所述预定时间，则控制所述提示装置发出所述水盒未安装到位的有关提示；以及
    如果所接收的指示信号全部指示无水的情况未持续所述预定时间，则控制所述提示装置发出所述水盒需加水的有关提示。
  12. 根据权利要求9所述的设备，其特征在于，
    所述一块或多块铜箔中相邻铜箔之间的间隔不小于5mm，且所述一块或多块铜箔中每一块铜箔的面积不小于200mm 2，优选不小于300mm 2；和/或
    所述一块或多块铜箔中每一块铜箔的形状为长方形。
  13. 根据权利要求1所述的设备，其特征在于，所述设备还包括：
    显示装置，所述控制装置还用于控制所述显示装置显示所述水盒的水位状态；和/或
    提示装置，所述控制装置还用于在所述水盒的水位达到预警值的情况下，控制所述提示装置发出提示。
  14. 一种蒸汽炉，其特征在于，所述蒸汽炉包括根据权利要求1至13中任意一项权利要求所述的用于蒸汽炉的水位检测设备。
  15. 一种用于蒸汽炉的水位检测方法，其特征在于，所述蒸汽炉包括根据权利要 求1至13中任意一项权利要求所述的用于蒸汽炉的水位检测设备，所述方法包括：
    检测所述蒸汽炉的水盒的一个或多个预定位置处是否有水，并生成每个所述预定位置处是否有水的指示信号；以及
    根据所述指示信号确定所述蒸汽炉的水盒的水位状态。
  16. 根据权利要求15所述的方法，其特征在于，所述蒸汽炉包括根据权利要求9至13中任意一项权利要求所述的用于蒸汽炉的水位检测设备，所述检测所述蒸汽炉的水盒的一个或多个预定位置处是否有水，并输出每个所述预定位置处是否有水的指示信号包括：
    检测一块或多块铜箔分别与大地组成的各电容的电容值；以及
    根据所述各电容的电容值输出所述指示信号。
  17. 根据权利要求16所述的方法，所述根据所述各电容的电容值输出对应的电平信号包括：
    在所检测的电容值大于预定值的情况下，输出指示有水的指示信号；以及
    在所检测的电容值不大于所述预定值的情况下，输出指示无水的指示信号。
  18. 根据权利要求17所述的方法，其特征在于，所述方法还包括：
    显示所述水盒的水位状态；和/或
    在所述水盒的水位达到预警值的情况下，发出提示。
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CN206235378U (zh) * 2016-12-12 2017-06-09 杭州信多达电器有限公司 一种用于非导电性水箱的非接触电容传感式液位检测装置
CN108088529A (zh) * 2018-01-23 2018-05-29 广东美的厨房电器制造有限公司 用于蒸汽炉的水位检测设备及方法、蒸汽炉
CN108267193A (zh) * 2018-01-23 2018-07-10 广东美的厨房电器制造有限公司 用于蒸汽炉的水位检测设备及蒸汽炉

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CN112833996A (zh) * 2020-12-31 2021-05-25 成都市汇鑫达机械有限公司 一种能够降低误差的工业锅炉蒸汽水量检测装置
CN112833996B (zh) * 2020-12-31 2024-05-10 东莞市粤文智慧能源有限公司 一种能够降低误差的工业锅炉蒸汽水量检测装置

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