CN111306798A - Condensing wall-mounted furnace, condensing heat exchanger and blockage fault detection method - Google Patents
Condensing wall-mounted furnace, condensing heat exchanger and blockage fault detection method Download PDFInfo
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- CN111306798A CN111306798A CN201911248518.6A CN201911248518A CN111306798A CN 111306798 A CN111306798 A CN 111306798A CN 201911248518 A CN201911248518 A CN 201911248518A CN 111306798 A CN111306798 A CN 111306798A
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- 238000001514 detection method Methods 0.000 title claims abstract description 44
- 239000007788 liquid Substances 0.000 claims abstract description 239
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 100
- 230000000903 blocking effect Effects 0.000 claims abstract description 22
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000003546 flue gas Substances 0.000 claims abstract description 15
- 238000009833 condensation Methods 0.000 claims description 13
- 230000005494 condensation Effects 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 3
- 230000011664 signaling Effects 0.000 claims 1
- 230000009977 dual effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 239000000779 smoke Substances 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
- F24H9/1832—Arrangement or mounting of combustion heating means, e.g. grates or burners
- F24H9/1836—Arrangement or mounting of combustion heating means, e.g. grates or burners using fluid fuel
-
- 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
- G01F23/24—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 resistance of resistors due to contact with conductor fluid
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The invention relates to a condensing wall-mounted furnace, a condensing heat exchanger and a blockage fault detection method, wherein the condensing heat exchanger comprises the following components: the heat exchanger main body allows the high-temperature flue gas to be condensed for heat exchange; the first liquid level detector is arranged in the heat exchanger main body and used for detecting whether the actual liquid level of the condensed water in the heat exchanger main body reaches a first limit liquid level or not; the second liquid level detector is arranged in the heat exchanger main body and used for detecting whether the actual liquid level of the condensed water in the heat exchanger main body reaches a second limit liquid level or not; the first limit liquid level and the second limit liquid level are both located on the same preset horizontal plane, the controller detects that the actual liquid level reaches the first limit liquid level at the first liquid level detector, and the second liquid level detector sends a blocking fault signal when detecting that the actual liquid level reaches the second limit liquid level. Carry out dual detection to the actual liquid level through first liquid level detector and second liquid level detector, prevent to make the misjudgement of jam fault, it is higher to the judgement rate of accuracy of comdenstion water drainage jam fault.
Description
Technical Field
The invention relates to the technical field of wall-mounted furnaces, in particular to a condensing wall-mounted furnace, a condensing heat exchanger and a blocking fault detection method.
Background
The gas heating water heater, also called a wall-hanging boiler, can be divided into a conventional wall-hanging boiler and a condensing wall-hanging boiler. The condensing wall-mounted boiler carries out secondary heat exchange by utilizing high-temperature flue gas, so that the heat exchange efficiency of the whole machine is improved, and the energy efficiency of the unit is improved. However, the condensate water also becomes a problem to be considered and disposed of in the design of the wall-hanging stove of the condensing type.
In the condensing wall-hanging furnace structure, a condensing heat exchanger is a device for recovering the waste heat of flue gas. Condensed water generated by the secondary heat exchange of the high-temperature flue gas is accumulated in the water seal device and is discharged through a condensed water drain pipe of the water seal device. However, when the condensed water drain pipe is blocked, the condensed water in the water seal device cannot be discharged in time, the condensed water is accumulated in the water seal device continuously, and the condensed water flows back into the hearth in the process of rising continuously, so that core components such as the fan, the proportional valve and the burner are immersed in water, and the unit is damaged due to faults. Therefore, a fault sensing device is required to be arranged, when the blockage of the condensate water drain pipe is detected, the alarm feedback is timely carried out, and the unit is protected.
Generally, the mode of detecting the blocking fault is electrode detection, specifically, two electrode needles are arranged in a condensation heat exchanger and/or a water seal device for detection, and when a condensate water drain pipe is blocked, the liquid level continuously rises, and the water is flooded without the two electrode needles and is conducted, the unit makes a judgment of sending the fault. However, in actual use, the electrode needle is used in a humid environment, and the natural gas components are impure and burned to form more impurities, which easily causes the detection needle to generate wrong unit fault judgment when the condensed water drain pipe is not blocked, and the water sealing device cannot judge the blocking fault accurately.
Disclosure of Invention
Therefore, the condensate heat exchanger with high accuracy in judging the condensate water drainage fault is needed.
A condensing heat exchanger comprising:
the heat exchanger main body allows the high-temperature flue gas to be condensed for heat exchange;
the first liquid level detector is arranged in the heat exchanger main body and used for detecting whether the actual liquid level of the condensed water in the heat exchanger main body reaches a first limit liquid level or not;
the second liquid level detector is arranged in the heat exchanger main body and used for detecting whether the actual liquid level of the condensed water in the heat exchanger main body reaches a second limit liquid level or not; and
the controller is in communication connection with the first liquid level detector and the second liquid level detector;
wherein, first limit liquid level with second limit liquid level all is located same default horizontal plane, the controller is in first liquid level detector detects the actual liquid level reaches first limit liquid level, just second liquid level detector detects the actual liquid level reaches when the second limit liquid level, send and block up fault signal.
Among the above-mentioned condensation heat exchanger, detect the actual liquid level of comdenstion water through two detection device, only when first liquid level detector and second liquid level detector all detected the actual liquid level and reach when predetermineeing horizontal plane department, just think that the liquid level of comdenstion water rises, and the comdenstion water drain pipe blocks up, needs to send and blocks up the fault signal. When only one of the first liquid level detector and the second liquid level detector detects that the actual liquid level reaches the preset level, the controller can not send a blocking fault signal, so that the detection device is prevented from making a misjudgment of a blocking fault due to detection error, and the accuracy of judging the blocking fault of condensed water drainage is higher.
In one embodiment, the controller controls one of the first and second level detectors to start detection when the other of the first and second level detectors detects that the actual level reaches the corresponding first or second limit level.
In one embodiment, the first liquid level detector comprises a first electrode needle and a second electrode needle which are fixed in the heat exchanger main body, the first electrode needle and the second electrode needle comprise detection ends located at the first limit liquid level, and the detection ends of the first electrode needle and the second electrode needle are conducted through condensation water in common contact.
In one embodiment, the first electrode needle and the second electrode needle are vertically fixed on the top wall of the heat exchanger body, and the height reserved between the first electrode needle and the bottom wall of the heat exchanger body is equal to the height of the first limit liquid level.
In one embodiment, each of the first electrode needle and the second electrode needle comprises a conductive body and an insulating layer, the insulating layer wraps part of the outer surface of the conductive body, and the detection end is formed by a part of the first electrode needle or the second electrode needle, at which one end of the conductive body close to the first limit liquid level is exposed to the corresponding insulating layer.
In one embodiment, the second liquid level detector is a tuning fork liquid level meter arranged at the second limit liquid level, and the controller sends out a signal that the actual liquid level reaches the second limit liquid level when the actual vibration parameter of the tuning fork liquid level meter meets a preset condition.
In one embodiment, when the actual liquid level does not reach the second limit liquid level, the tuning fork liquid level meter vibrates to generate a waterless vibration parameter; when the actual liquid level reaches the second limit liquid level, the tuning fork liquid level meter vibrates to generate water vibration parameters;
the preset condition is that the actual vibration parameter is different from the anhydrous vibration parameter; or the preset condition is that the actual vibration parameter is the same as the water-existing vibration parameter.
The invention also provides a method for detecting the blocking fault, which comprises the following steps:
detecting whether the actual liquid level of the condensed water in the condensing heat exchanger reaches a first limit liquid level;
detecting whether the actual liquid level of the condensed water in the condensing heat exchanger reaches a second limit liquid which is at the same preset level with the first limit liquid level;
and sending a blockage fault signal when the actual liquid level is detected to reach the first limit liquid level and the second limit liquid level.
In one embodiment, the method comprises the following steps:
judging whether a first liquid level detector which is positioned at the first limit liquid level and formed by a first electrode needle and a second electrode needle structure is conducted or not;
judging whether the actual vibration parameters of a second liquid level detector which is positioned at the second limit liquid level and formed by a tuning fork liquid level meter structure meet preset conditions or not;
and when the first liquid level detector is switched on and the actual vibration parameter of the tuning fork liquid level meter meets the preset condition, sending a blocking fault signal.
The invention also provides a condensing wall-mounted furnace which comprises the condensing heat exchanger.
Drawings
FIG. 1 is a schematic diagram of a condensing heat exchanger according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of one direction of the condensing heat exchanger of FIG. 1;
FIG. 3 is a schematic view of the condensing heat exchanger of FIG. 2 when the actual level of the condensing water reaches a threshold level;
fig. 4 is a schematic cross-sectional view of the condensing heat exchanger of fig. 1 taken in another direction.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention 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.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
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 invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In an embodiment of the present invention, a condensing wall-mounted furnace is provided, which includes a combustion assembly, a main heat exchanger, a condensing heat exchanger 100 (as shown in fig. 1), and a water pipe connected between the main heat exchanger and the condensing heat exchanger 100, so that water flows through the main heat exchanger and the condensing heat exchanger 100 to perform two heat exchanges. Specifically, the heat that the natural gas burning produced in the combustion assembly exchanges heat with the rivers in the main heat exchanger to the rivers in the heating main heat exchanger, the high temperature flue gas that the burning produced in the combustion assembly can get into among the condensation heat exchanger 100 moreover and make rivers and then the secondary heat transfer, make the rivers in the condensation heat exchanger 100 absorb the waste heat of high temperature flue gas, so carry out twice heat transfer in rivers can main heat exchanger and the condensation heat exchanger 100, heat exchange efficiency is higher. Therefore, the lowest smoke exhaust temperature of the condensing wall-mounted furnace can be reduced to about 40 ℃, the latent heat of the water vapor in the smoke can be fully absorbed and utilized, and the heat efficiency of the condensing wall-mounted furnace can be more than 100 percent and can reach 109 percent at most.
The condensing wall-mounted furnace also comprises a water sealing device, wherein the water sealing device is connected with the condensing heat exchanger and used for discharging condensed water generated by condensing flue gas in the condensing heat exchanger, and meanwhile, certain condensed water is accumulated in the water sealing device to form a water seal so as to prevent gas containing toxic substances in the condensing heat exchanger from leaking to the external environment.
As shown in fig. 1-2, the condensing heat exchanger 100 includes a heat exchanger body 10, the heat exchanger body 10 allows the high temperature flue gas to perform condensation heat exchange, so that water flow in the heat exchanger body 10 absorbs heat of the high temperature flue gas to perform secondary heat exchange, and meanwhile, condensed water is generated during the condensation process of the high temperature flue gas, flows to the bottom of the heat exchanger body 10 under the action of gravity, flows to a water seal device communicated with the heat exchanger body 10, and is finally discharged along a condensed water drain pipe of the water seal device. Specifically, the heat exchanger main body 10 comprises a shell 12 with a smoke gas cavity and a water circulation pipe 14 penetrating through the smoke gas cavity, wherein the water circulation pipe 14 is provided with a water inlet 11 and a water outlet 13 which are communicated with each other, so that water flow is introduced into the water circulation pipe 14 through the water inlet 11, and the water flow after heat exchange is discharged through the water outlet 13; an air inlet 12 and an air outlet 14 are arranged on the shell 12, so that high-temperature flue gas is introduced into the flue gas cavity through the air inlet 12, and the flue gas after heat exchange is discharged through the air outlet 14.
As shown in fig. 2 to 4, the condensing heat exchanger 100 further includes a first liquid level detector 30, a second liquid level detector 50, and a controller (not shown), wherein the first liquid level detector 30 is disposed in the heat exchanger main body 10 for detecting whether an actual liquid level of condensed water in the heat exchanger main body 10 reaches a first limit liquid level, the second liquid level detector 50 is disposed in the heat exchanger main body 10 for detecting whether an actual liquid level of condensed water in the heat exchanger main body 10 reaches a second limit liquid level, and the controller is in communication connection with the first liquid level detector 30 and the second liquid level detector 50. And, the first limit liquid level and the second limit liquid level are located at the same preset level, the controller sends out a jam fault signal when the first liquid level detector 30 detects that the actual liquid level reaches the first limit liquid level and the second liquid level detector 50 detects that the actual liquid level reaches the second limit liquid level. So, detect the actual liquid level of comdenstion water through two detection device, only when first liquid level detector 30 and second liquid level detector 50 all detected the actual liquid level and reach and predetermine horizontal plane department, just consider the liquid level of comdenstion water and rise, the comdenstion water drain pipe blocks up, needs to send and blocks up fault signal. When only one of the first liquid level detector 30 and the second liquid level detector 50 detects that the actual liquid level reaches the preset level, the controller does not send out a blocking fault signal, so that the detection device is prevented from making a false judgment of a blocking fault due to detection error, and the judgment accuracy rate of the blocking fault of condensed water drainage is high. The blocking fault signal sent by the controller can be used as a control instruction to control the stop of the condensing wall-mounted boiler and send out fault alarm information and the like.
Further, the controller controls one of the first and second liquid level detectors 30, 50 to start detection when the other of the first and second liquid level detectors 30, 50 detects that the actual liquid level reaches the corresponding first or second limit level. That is, the second liquid level detector 50 is controlled to start detecting when the first liquid level detector 30 detects that the actual liquid level reaches the first limit level. Alternatively, the first level detector 30 is controlled to start detecting when the second level detector 50 detects that the actual level reaches the second limit level. That is, when one of the first liquid level detector 30 and the second liquid level detector 50 detects an abnormal condition, the other one is controlled to start detection, so that the first liquid level detector 30 and the second liquid level detector 50 do not need to simultaneously detect in real time, and the power consumption of the detection device is reduced. In this embodiment, the second liquid level detector 50 is controlled to start detecting when the first liquid level detector 30 detects that the actual liquid level reaches the first limit level.
The first liquid level detector 30 comprises a first electrode needle 32 and a second electrode needle 34 which are fixed in the heat exchanger main body 10, the first electrode needle 32 and the second electrode needle 34 respectively comprise a detection end 31 located at a first limit liquid level, and the detection ends 31 of the first electrode needle 32 and the second electrode needle 34 are conducted through condensation water which is in common contact. When the comdenstion water drain pipe blockked up, the comdenstion water liquid level constantly rises in heat exchanger main part 10, when the comdenstion water liquid level that constantly rises reaches first limit liquid level, first electrode needle 32 and second electrode needle 34 are located the sense terminal 31 of first limit liquid level department just can all contact with the comdenstion water, first electrode needle 32 and second electrode needle 34 can switch on each other, so the controller through judging whether first electrode needle 32 and second electrode needle 34 switch on alright judge the actual liquid level of comdenstion water and whether reach first limit liquid level.
In this embodiment, the first electrode needle 32 and the second electrode needle 34 are both vertically fixed on the top wall of the heat exchanger body 10, and the height reserved between the first electrode needle 32 and the bottom wall of the heat exchanger body 10 is equal to the height of the limit liquid level, so that the first electrode needle 32 and the second electrode needle 34 are vertically installed, and the detection ends 31 of the first electrode needle 32 and the second electrode needle 34 are both located at the limit liquid level. It is understood that in other embodiments, the first electrode needle 32 and the second electrode needle 34 may be installed in the heat exchanger body 10 obliquely as long as the detection ends 31 of the first electrode needle 32 and the second electrode needle 34 are ensured to be located at the limit liquid level.
Specifically, each of the first electrode needle 32 and the second electrode needle 34 includes a conductive body 33 and an insulating layer 35 (as shown in fig. 2), the insulating layer 35 includes a part of the outer surface of the conductive body 33, and the detection end 31 is formed by a part of the first electrode needle 32 or the second electrode needle 34, where one end of the conductive body 33 close to the first limit liquid level is exposed to the corresponding insulating layer 35, so that the other parts except the detection end 31 are wrapped by the insulating layer 35. In a humid environment, water droplets adhered to the first electrode needle 32 and the second electrode needle 34 can naturally flow away along the insulating layer 35 under the action of gravity, and the first electrode needle 32 and the second electrode needle 34 are prevented from being conducted.
The second liquid level detector 50 is a tuning fork level gauge arranged at the second limit liquid level, and the controller sends out a signal that the actual liquid level reaches the second limit liquid level when the actual vibration parameter of the tuning fork level gauge meets the preset condition. The tuning fork liquid level meter is provided with a pressure point crystal and a vibrating piece, and the pressure point crystal excites the vibrating piece to vibrate. And the vibration parameter of vibrating piece is related to the medium of vibration transmission, and the vibration parameter of vibrating piece in the air and aquatic is different, if the actual liquid level of comdenstion water reaches second limit liquid level, the medium of vibrating piece transmission vibration becomes water by the air, and the vibration parameter just can accord with the preset condition, alright send the signal that the actual liquid level reaches second limit liquid level this moment. It is understood that the second liquid level detector 50 can be other sensors, such as a photoelectric liquid level detector, etc., and the specific type of the second liquid level detector 50 is not limited herein.
Further, when the actual liquid level does not reach the second limit liquid level, the tuning fork liquid level meter vibrates to generate anhydrous vibration parameters; when the actual liquid level reaches the second limit liquid level, the tuning fork liquid level meter vibrates to generate water vibration parameters. The waterless vibration parameters are different from the water vibration parameters, and the vibration parameters comprise vibration frequency and vibration amplitude. The preset condition is that the actual vibration parameter is different from the anhydrous vibration parameter, the tuning fork liquid level meter does not vibrate in the air, the condensed water liquid level is in contact with the tuning fork liquid level meter after rising to the limit liquid level, and the actual liquid level can reach the second limit liquid level. Or, the preset condition is that the actual vibration parameter is the same as the water-existing vibration parameter, which indicates that the tuning fork level gauge vibrates in the water environment, indicates that the actual liquid level of the condensed water reaches the second limit liquid level, and can send a signal that the actual liquid level reaches the second limit liquid level. Alternatively, the signal that the actual level reaches the second limit level may be a current signal, a digital signal, or the like.
Specifically, in the detection process, when the first electrode needle 32 and the second electrode needle 34 are conducted, the tuning fork level gauge is controlled to vibrate to further judge whether the actual liquid level reaches the limit liquid level.
In an embodiment of the present invention, there is further provided the condensing heat exchanger 100, wherein the first liquid level detector 30 and the second liquid level detector 50 perform double detection on an actual liquid level of the condensed water, so that an accuracy rate of judging a blockage fault of the condensed water drainage is high.
In an embodiment of the present invention, a method for detecting a blocking fault is further provided, including the following steps:
and S100, detecting whether the actual liquid level of the condensed water in the condensing heat exchanger 100 reaches a first limit liquid level or not, and detecting the actual liquid level of the condensed water for the first time.
Specifically, it is judged whether the first liquid level detector 30, which is located at the first limit liquid level and is configured by the first electrode needle 32 and the second electrode needle 34, is turned on. That is, it is detected by the first level detector 30 whether the actual liquid level reaches the first limit level. And, the first liquid level detector 30 includes a first electrode needle 32 and a second electrode needle 34, the first electrode needle 32 and the second electrode needle 34 each having a detection end 31 located at the first limit liquid level, and when the actual liquid level reaches the first limit liquid level, the first electrode needle 32 and the second electrode needle 34 are conducted by condensed water in common contact. Therefore, whether the actual liquid level reaches the first limit level is detected by determining whether the first liquid level detector 30 is turned on, and whether the first electrode needle 32 and the second electrode needle 34 are turned on.
And step S200, detecting whether the actual liquid level of the condensed water in the condensing heat exchanger 100 reaches a second limit liquid level which is positioned at the same preset horizontal plane as the first limit liquid level, and carrying out secondary detection on the actual liquid level of the condensed water so as to improve the detection accuracy through double detection. In addition, the two detections of the actual liquid level of the condensed water may be performed simultaneously, or the second detection may be started after the first detection is performed to find abnormality, and the order of the two detections is not limited herein.
Specifically, it is determined whether the actual vibration parameter of the second liquid level detector 50, which is located at the second limit level and formed by the tuning fork level gauge configuration, meets a preset condition. That is, it is detected by the second level detector 50 whether the actual liquid level reaches the second limit level. And, the second liquid level detector 50 is a tuning fork level gauge located at the second limit level, and the vibration parameters of the tuning fork level gauge in the air are different from the vibration parameters of the tuning fork level gauge in the water, so that the environment where the tuning fork level gauge is located can be judged by judging whether the actual vibration parameters of the tuning fork level gauge meet the preset conditions, and further, whether the actual level of the condensed water reaches the second limit level can be judged. In this embodiment, when the first electrode needle 32 and the second electrode needle 34 are conducted with each other, the tuning fork level gauge is controlled to start detecting, and the tuning fork level gauge does not need to be in a detection state all the time, so that energy consumption is reduced.
When the actual liquid level of the condensed water does not reach the second limit liquid level, the tuning fork liquid level meter vibrates to generate anhydrous vibration parameters; when the actual liquid level of the condensed water reaches the second limit liquid level, the tuning fork liquid level meter vibrates to generate water vibration parameters. The waterless vibration parameters are different from the water vibration parameters, and the vibration parameters comprise vibration frequency and vibration amplitude. The preset condition is that the actual vibration parameter is different from the anhydrous vibration parameter, the tuning fork liquid level meter does not vibrate in the air, the condensed water liquid level is in contact with the tuning fork liquid level meter after rising to the limit liquid level, and the actual liquid level can reach the second limit liquid level. Or, the preset condition is that the actual vibration parameter is the same as the water-existing vibration parameter, which indicates that the tuning fork level gauge vibrates in the water environment and indicates that the actual liquid level of the condensed water reaches the second limit liquid level.
And step S300, when the actual liquid level is detected to reach the first limit liquid level and the second limit liquid level, a blocking fault signal is sent out. That is to say, when detecting that the actual liquid level reaches one of the first limit liquid level and the second limit liquid level but not the other, the possible detector generates false detection, and does not send out a blocking fault signal, thereby reducing the situation of misjudging the blocking fault and improving the accuracy of judging the blocking fault of the condensed water. Optionally, the blocking fault signal is an electrical signal, a digital signal, or the like, and may represent that a blocking fault occurs, so as to control subsequent processing, for example, to stop the condensing wall-hanging furnace and send a fault notification message.
Specifically, when the first level detector 30 is turned on (the first electrode needle 32 and the second electrode needle 34 are turned on with each other), and the actual vibration parameter of the tuning fork level gauge meets the preset condition, a blocking fault signal is issued. That is, when the actual liquid level detected in a double manner reaches the first limit liquid level and the second limit liquid level in the preset horizontal plane, it can be accurately determined that the liquid level rises and the drain is clogged.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within 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 invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A condensing heat exchanger (100) comprising:
the heat exchanger main body (10) allows high-temperature flue gas to be condensed and exchange heat;
the first liquid level detector (30) is arranged in the heat exchanger main body (10) and is used for detecting whether the actual liquid level of the condensed water in the heat exchanger main body (10) reaches a first limit liquid level or not;
the second liquid level detector (50) is arranged in the heat exchanger main body (10) and is used for detecting whether the actual liquid level of the condensed water in the heat exchanger main body (10) reaches a second limit liquid level or not; and
a controller in communication with the first level detector (30) and the second level detector (50);
wherein, first limit liquid level with second limit liquid level all is located same default horizontal plane, the controller is in first liquid level detector detects the actual liquid level reaches first limit liquid level, just second liquid level detector detects the actual liquid level reaches when the second limit liquid level, send and block up fault signal.
2. The condensing heat exchanger (100) according to claim 1, wherein the controller controls one of the first and second liquid level detectors (30, 50) to start detecting when the other of the first and second liquid level detectors (30, 50) detects that the actual liquid level reaches the corresponding first or second limit level.
3. The condensation heat exchanger (100) according to claim 1 or 2, wherein the first liquid level detector (30) comprises a first electrode needle (32) and a second electrode needle (34) both fixed within the heat exchanger body (10), the first electrode needle (32) and the second electrode needle (34) each comprising a detection end (31) located at the first limit liquid level, the detection ends (31) of the first electrode needle (32) and the second electrode needle (34) being conducted by condensed water in common contact.
4. The condensation heat exchanger (100) according to claim 3, wherein the first electrode needle (32) and the second electrode needle (34) are both fixed vertically on the top wall of the heat exchanger body (10) and the height reserved between them and the bottom wall of the heat exchanger body (10) is equal to the height of the first limit level.
5. The condensation heat exchanger (100) according to claim 4, wherein the first electrode needle (32) and the second electrode needle (34) each comprise a conductive body (33) and an insulating layer (35), the insulating layer (35) wraps a portion of the outer surface of the conductive body (33), and the detection end (31) is formed by a portion of the first electrode needle (32) or the second electrode needle (34) where the end of the conductive body (33) close to the first limit liquid level is exposed to the insulating layer (35).
6. The condensation heat exchanger (100) according to claim 1 or 2, wherein the second level detector (50) is a tuning fork level gauge provided at the second limit level, the controller signaling the actual level reaching the second limit level when an actual vibration parameter of the tuning fork level gauge meets a preset condition.
7. The condensing heat exchanger (100) of claim 6, wherein said tuning fork level gauge vibrates to produce a waterless vibration parameter when said actual level does not reach said second limit level; when the actual liquid level reaches the second limit liquid level, the tuning fork liquid level meter vibrates to generate water vibration parameters;
the preset condition is that the actual vibration parameter is different from the anhydrous vibration parameter; or the preset condition is that the actual vibration parameter is the same as the water-existing vibration parameter.
8. A method of jam fault detection, comprising the steps of:
detecting whether the actual liquid level of the condensed water in the condensing heat exchanger (100) reaches a first limit liquid level;
detecting whether the actual liquid level of the condensed water in the condensing heat exchanger (100) reaches a second limit liquid which is at the same preset level with the first limit liquid level;
and sending a blockage fault signal when the actual liquid level is detected to reach the first limit liquid level and the second limit liquid level.
9. The jam fault detection method according to claim 8, characterized by comprising the steps of:
judging whether a first liquid level detector (30) which is positioned at the first limit liquid level and formed by a first electrode needle (32) and a second electrode needle (34) is conducted or not;
judging whether the actual vibration parameters of a second liquid level detector (50) which is positioned at the second limit liquid level and formed by a tuning fork liquid level meter structure meet preset conditions or not;
and when the first liquid level detector (30) is switched on and the actual vibration parameter of the tuning fork liquid level meter meets the preset condition, sending a blocking fault signal.
10. A condensing wall-hanging stove, characterized in that it comprises a condensing heat exchanger (100) according to any one of the preceding claims 1 to 7.
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