CN110986375B - Method for identifying failure of temperature detection device and gas water heater - Google Patents

Method for identifying failure of temperature detection device and gas water heater Download PDF

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Publication number
CN110986375B
CN110986375B CN201911202320.4A CN201911202320A CN110986375B CN 110986375 B CN110986375 B CN 110986375B CN 201911202320 A CN201911202320 A CN 201911202320A CN 110986375 B CN110986375 B CN 110986375B
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water
temperature
outlet
detection device
temperature detection
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CN110986375A (en
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郑来松
梁剑明
卢克勤
潘叶江
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Vatti Co Ltd
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Vatti Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24HFLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00Details
    • F24H9/20Arrangement or mounting of control or safety devices
    • F24H9/2007Arrangement or mounting of control or safety devices for water heaters
    • F24H9/2035Arrangement or mounting of control or safety devices for water heaters using fluid fuel
    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/18Status alarms

Abstract

Hair brushThe invention discloses a method for identifying the failure of a temperature detection device, which comprises the following steps: s1: user boiling water and simultaneously sampling inlet water temperature T of gas water heater0(ii) a S2: continuously detecting and judging opening B of gas proportional valve1Whether or not it is greater than or equal to the opening degree threshold Bs1If yes, entering the next step; s3: sampling first outlet water temperature T of gas water heater1(ii) a S4: comparing the first outlet water temperature T1And inlet water temperature T0Whether the difference is less than or equal to a temperature threshold Ts; s5: whether the water temperature detecting device is out of order is determined based on the comparison result. According to the method for identifying the failure of the temperature detection device, whether the water temperature detection device fails or not is intelligently judged by detecting and judging the relation between the difference value of the outlet water temperature and the unheated inlet water temperature and the temperature threshold value in the process of continuously increasing the opening of the fuel gas proportional valve, so that the user is effectively prevented from being scalded due to the abnormally high outlet water temperature, and the water use safety and the water use experience of the user are improved.

Description

Method for identifying failure of temperature detection device and gas water heater
Technical Field
The invention relates to the technical field of water heaters, in particular to a temperature detection device for a water heater.
Background
Most of the existing gas water heaters are not added with a temperature sensor for failure judgment. Because the gas water heater uses PID to control, after the water outlet temperature sensor is invalid, the water outlet temperature can be always at a low temperature value and kept unchanged, and because the water outlet temperature is far away from the target temperature, the water outlet temperature is obtained by a PID algorithm: the water heater load can increase all the time until keeping burning at maximum load, if intake temperature is low and the flow is less this moment, can cause actual leaving water temperature to be higher than predetermined control temperature, and then is scalded when leading to the user water easily, influences user experience.
Disclosure of Invention
The invention aims to solve at least one of the problems in the prior related art to a certain extent, and therefore the invention provides a method for identifying the failure of a temperature detection device, which determines whether the temperature detection device fails or not by judging whether the outlet water temperature changes or not when the opening of a gas proportional valve is increased, thereby effectively preventing users from being scalded due to the abnormally high outlet water temperature, and improving the water use safety and water use experience of the users.
The invention also provides a gas water heater applying the method for identifying the failure of the temperature detection device.
According to the provided method for identifying the failure of the temperature detection device, the method is realized by the following technical scheme:
a method of identifying failure of a temperature sensing device, the method comprising the steps of:
s1: user boiling water and simultaneously sampling inlet water temperature T of gas water heater0
S2: continuously detecting and judging opening B of gas proportional valve1Whether or not it is greater than or equal to the opening degree threshold Bs1If yes, entering the next step;
s3: sampling first outlet water temperature T of gas water heater1
S4: comparing the first outlet water temperature T1And inlet water temperature T0Whether the difference is less than or equal to a temperature threshold Ts;
s5: whether the water temperature detecting device is out of order is determined based on the comparison result.
In some embodiments, in step S5, if T is1-T0If Ts is less than or equal to Ts, preliminarily determining that the water temperature detection device fails; if T is1-T0And if the temperature is more than Ts, determining that the water temperature detection device is normal, and controlling the gas water heater to normally work until the operation is finished.
In some embodiments, the identification method further comprises the steps of:
s6: adjusting the opening of the gas proportional valve to the minimum opening Bs0Or directly closing the gas proportional valve;
s7: sampling second outlet water temperature T of gas water heater2
S8: comparing the second outlet water temperature T2Whether it is higher than the first outlet water temperature T1And a temperature threshold Ts;
s9: whether the water temperature detection device is out of order is further determined by the comparison result.
In some embodiments, the identification method further comprises the steps of:
s6': the water inlet flow of the gas water heater is increased;
s7: sampling second outlet water temperature T of gas water heater2
S8: comparing the second outlet water temperature T2Whether it is higher than the first outlet water temperature T1And a temperature threshold Ts;
s9: whether the water temperature detection device is out of order is further determined by the comparison result.
In some embodiments, in step S7, after the interval time Δ T, the second outlet water temperature T of the gas water heater is sampled2
In some embodiments, in step S9, if T is2>T1Ts, further determining that the water temperature detection device fails and sending an alarm signal, and simultaneously controlling the gas water heater to stop working; if T is2≤T1And Ts, determining that the water temperature detection device is normal, and controlling the gas water heater to resume normal operation until the operation is finished.
According to the gas heater who provides above-mentioned, it realizes through following technical scheme:
the utility model provides a gas water heater, includes water heater body, intake pipe, inlet tube and outlet pipe, its characterized in that still includes: the gas proportional valve is arranged on the air inlet pipe and used for adjusting the air inlet flow of the air inlet pipe; the water inlet temperature detection device is arranged on the water inlet pipe and is used for detecting the water inlet temperature of the water inlet pipe; the water outlet temperature detection device is arranged on the water outlet pipe and is used for detecting the water outlet temperature of the water outlet pipe; a controller electrically connected with the gas proportional valve, the water inlet temperature detection device and the water outlet temperature detection device respectively and used for comparing the first water outlet temperature T detected by the water outlet temperature detection device1And the water inlet temperature T detected by the water inlet temperature detection device0Is less than or equal to a temperature threshold value Ts, and determines whether the outlet water temperature detection means is disabled based on the comparison result.
In some embodiments, the controller adjusts the opening degree of the gas proportional valve to a minimum opening degree Bs by adjusting the opening degree of the gas proportional valve to a minimum opening degree Bs0Or after the gas proportional valve is controlled to be closed, the second outlet water temperature T detected by the outlet water temperature detection device is compared2Whether it is higher than the first outlet water temperature T1And a temperature threshold value Ts, and determines again whether the outlet water temperature detection means is out of operation based on the comparison result.
In some embodiments, the water-saving device further comprises a water proportional valve and a booster water pump, wherein the water proportional valve is arranged on the water inlet pipe and is electrically connected with the controller for adjusting the water inlet flow of the water inlet pipe; the booster water pump is arranged on the water inlet pipe, is electrically connected with the controller and is used for increasing the water inlet flow of the water inlet pipe; after the controller increases the inflow water flow of the water inlet pipe through the water proportional valve or the booster water pump, the controller compares the second outflow water temperature T detected by the outflow water temperature detection device2Whether it is higher than the first outlet water temperature T1And a temperature threshold value Ts, and determines again whether the outlet water temperature detection means is out of operation based on the comparison result.
In some embodiments, the water temperature detection device further comprises an alarm electrically connected to the controller, and the controller controls the alarm to send an alarm signal when the controller further determines that the water temperature detection device is out of order.
Compared with the prior art, the invention at least comprises the following beneficial effects: according to the identification method for the failure of the temperature detection device, the opening of the gas proportional valve is continuously increased, and whether the water temperature detection device fails or not is intelligently judged by detecting and judging the relation between the difference value of the water temperature and the unheated water temperature before heating and the temperature threshold value, so that the user is effectively prevented from being scalded due to the abnormal high temperature of the water temperature, and the water use safety and the water use experience of the user are improved.
Drawings
Fig. 1 is a flowchart of a method for identifying a failure of a temperature detection device in embodiment 1 of the present invention;
FIG. 2 is a connection block diagram of a gas water heater in embodiment 1 of the present invention;
fig. 3 is a flowchart of a method for identifying a failure of a temperature detection device in embodiment 2 of the present invention;
fig. 4 is a connection block diagram of the gas water heater in embodiment 2 of the present invention.
Detailed Description
The present invention is illustrated by the following examples, but the present invention is not limited to these examples. Modifications to the embodiments of the invention or equivalent substitutions of parts of technical features without departing from the spirit of the invention are intended to be covered by the scope of the claims of the invention.
Example 1
As shown in fig. 1, a method for identifying a failure of a temperature detection device, the method comprising the steps of:
s1: user boiling water and simultaneously sampling inlet water temperature T of gas water heater0
Specifically, the gas water heater includes water heater body, inlet tube and controller, is equipped with the temperature-detecting device that intakes that is used for detecting the temperature of intaking on the inlet tube, and this temperature-detecting device that intakes is connected with the controller electricity. When the user uses water at the water end, the water inlet temperature T of the water inlet pipe is sampled by the water inlet temperature detection device0And the sampled inlet water temperature T is measured0The signal is transmitted to the controller, so that the controller can calculate the first outlet water temperature T sampled after the gas water heater is ignited, combusted and heated1And the temperature T of the inlet water0The difference value.
S2: continuously detecting and judging opening B of gas proportional valve1Whether or not it is greater than or equal to the opening degree threshold Bs1If yes, entering the next step;
specifically, the gas water heater also comprises an air inlet pipe and a gas proportional valve, wherein the gas proportional valve is arranged on the air inlet pipe and is electrically connected with the controller for adjusting the air inlet flow of the air inlet pipe. After a user boils water, the controller of the gas water heater continuously increases the opening of the gas proportional valve to ignite, burn and heat, and the water heater can be rapidly heated to a preset target temperature. Opening of gas proportional valve is continuously increasedThe combustion heating load is continuously increased, and in this process, the opening degree B of the gas proportional valve is continuously detected and judged1Whether or not it is greater than or equal to the opening degree threshold Bs1If the opening degree B of the gas proportional valve1More than or equal to opening threshold Bs1Entering the next step; if the opening degree B of the gas proportional valve1< opening degree threshold Bs1Then execution continues with step S2.
S3: sampling first outlet water temperature T of gas water heater1
Specifically, the gas water heater further comprises a water outlet pipe and a water outlet temperature detection device, wherein the water outlet temperature detection device is arranged on the water outlet pipe, electrically connected with the controller and used for detecting the water outlet temperature of the water outlet pipe. When opening degree B of gas proportional valve1More than or equal to opening threshold Bs1The method can accurately and reliably ensure that the actual outlet water temperature of the water outlet pipe is higher than the inlet water temperature T of the unheated water inlet pipe0. First water outlet temperature T of sampling water outlet pipe of water outlet temperature control device1And the sampled first outlet water temperature T is measured1The signal is transmitted to the controller, so that the controller can calculate the sampled first outlet water temperature T1And inlet water temperature T0The difference of (a).
S4: comparing the first outlet water temperature T1And inlet water temperature T0Whether the difference is less than or equal to a temperature threshold Ts;
s5: whether the water temperature detecting device is out of order is determined based on the comparison result.
Specifically, in step S5, if the outlet water temperature detection means has failed, the first outlet water temperature T detected by the failed outlet water temperature detection means1Is inevitably lower than the actual outlet temperature of the water outlet pipe, and the controller compares T once1-T0Ts is less than or equal to, the failure of the water temperature detection device can be preliminarily determined; if the outlet water temperature detection device does not fail, the first outlet water temperature T detected by the non-failure inlet water temperature detection device1Is inevitably equal to the actual outlet water temperature of the outlet pipe, and the controller compares T at the moment1-T0If the temperature is more than Ts, the water temperature detection device can be determined to be normal, and the gas water heater is controlled to normally work until the operation is finished.
In the method for identifying the failure of the temperature detection device, the first outlet water temperature T of the water outlet pipe is detected through the process of continuously increasing the opening degree of the gas proportional valve1And comparing the detected first outlet water temperature T1And the inlet water temperature T of the unheated water supply pipe0The relation of the difference and the temperature threshold Ts, whether the water temperature detection device is out of work is intelligently judged based on the comparison result, so that whether the water temperature detection device is out of work is identified by fully utilizing the existing components and algorithms of the gas water heater, the user is effectively prevented from being scalded due to the abnormal high temperature of the water outlet temperature, and the water use safety and the water use experience of the user are improved.
As shown in fig. 1, further, the identification method further includes the steps of:
s6: adjusting the opening of the gas proportional valve to the minimum opening Bs0Or directly closing the gas proportional valve;
specifically, the controller adjusts the opening of the gas proportional valve to the minimum opening Bs0Or directly closing the gas proportional valve, the minimum opening degree Bs0Less than opening B of gas proportional valve1Therefore, the combustion heating load can be reduced, and the water outlet temperature of the water outlet pipe is rapidly reduced.
S7: sampling second outlet water temperature T of gas water heater2
Specifically, the controller controls the outlet water temperature device to sample the second outlet water temperature T of the outlet water pipe2And the sampled second outlet water temperature T is measured2The signal is transmitted to the controller so that the controller can compare the second outlet water temperature T2And the first outlet water temperature T1Relation of + temperature threshold Ts.
S8: comparing the second outlet water temperature T2Whether it is higher than the first outlet water temperature T1And a temperature threshold Ts;
s9: whether the water temperature detection device is out of order is further determined by the comparison result.
In particular, the gas water heater alsoComprises an alarm which is electrically connected with a controller. In step S9, if T2>T1Ts, further determining that the water temperature detection device fails and sending an alarm signal, and simultaneously controlling the gas water heater to stop working; if T is2≤T1And Ts, determining that the water temperature detection device is normal, and controlling the gas water heater to resume normal operation until the operation is finished.
According to the method for identifying the failure of the temperature detection device, the occurrence of misjudgment is effectively avoided through double judgment, so that the accuracy and the reliability of the identification judgment of the failure of the outlet water temperature detection device are improved; in addition, when the water outlet temperature detection device is found to be invalid, an alarm signal is sent out in time to remind a user, and meanwhile, the hot-gas water heater is controlled to stop working in time, so that the user is prevented from being scalded due to the abnormal high temperature of the water outlet temperature.
Preferably, in step S7, after the interval time Δ T, the second outlet water temperature T of the gas water heater is sampled again2. The controller is integrated with a timer and adjusts the opening of the gas proportional valve to the minimum opening Bs0Or when the gas proportional valve is directly closed, the timer starts timing; when the timing duration reaches the interval time delta T, the controller controls the water outlet temperature detection device to sample the second water outlet temperature T of the water outlet pipe2. Therefore, the time interval delta t is used for ensuring that the effect of reducing the outlet water temperature of the water outlet pipe is more obvious, and the accuracy and the reliability for further determining whether the water temperature detection device is invalid are improved.
As shown in fig. 2, the gas water heater of the present embodiment employs the above method for identifying the failure of the temperature detection device, and the gas water heater includes a water heater body, an air inlet pipe, an inlet pipe, and an outlet pipe, and is characterized by further including: the gas proportional valve is arranged on the gas inlet pipe and used for adjusting the gas inlet flow of the gas inlet pipe; the inlet water temperature detection device is arranged on the inlet water pipe and is used for detecting the inlet water temperature of the inlet water pipe; the water outlet temperature detection device is arranged on the water outlet pipe and is used for detecting the water outlet temperature of the water outlet pipe; a controller electrically connected with the gas proportional valve, the inlet water temperature detection device and the outlet water temperature detection device respectively for comparingFirst outlet water temperature T detected by water temperature detection device1And the water inlet temperature T detected by the water inlet temperature detection device0Is less than or equal to a temperature threshold value Ts, and determines whether the water temperature detection means is disabled based on the comparison result.
From this, the gas heater of this embodiment, it is judged out through intelligence whether water temperature detection device became invalid, has avoided effectively scalding the user because of the unusual high temperature of leaving water temperature, promotes the water safety, improves user's water experience.
Further, the controller adjusts the opening of the gas proportional valve to the minimum opening Bs0Or after the gas proportional valve is controlled to be closed, the second outlet water temperature T detected by the outlet water temperature detection device is further compared2Whether it is higher than the first outlet water temperature T1And a temperature threshold value Ts, and further determines whether the water temperature detection means is disabled based on the comparison result. Thereby, the second outlet water temperature T is further judged2And a first outlet water temperature T1And whether the water temperature detection device fails or not is further determined according to the relation between the temperature threshold Ts, so that double judgment is realized, and misjudgment is effectively avoided.
Furthermore, the gas water heater also comprises an alarm which is electrically connected with the controller, and the controller controls the alarm to send out an alarm signal when the controller further determines that the water temperature detection device is failed. Therefore, when the water outlet temperature detection device is found to be invalid, the user is reminded by sending out an alarm signal in time, and the user can find out abnormality and report for repair in time.
Example 2
As shown in fig. 3 and 4, the present embodiment is different from embodiment 1 in that the method for identifying a failure of the temperature detection device is different from the method for triggering step S7, that is, step S6.
S6': the water inlet flow of the gas water heater is increased; specifically, the gas water heater also comprises a water proportional valve and a booster water pump, wherein the water proportional valve is arranged on the water inlet pipe and is electrically connected with the controller for adjusting the water inlet flow of the water inlet pipe. The booster water pump is arranged on the water inlet pipe and electrically connected with the controller for increasing the water inlet flow of the water inlet pipe. The controller increases the inflow water flow of the water inlet pipe through the water proportional valve or the booster water pump, so that the outflow water temperature of the water outlet pipe is rapidly reduced within a certain time, and the accuracy and the reliability of judging whether the water temperature detection device fails are further improved.
It can be seen that, in the embodiment, the opening of the gas proportional valve is adjusted to the minimum opening Bs by adopting "increasing the water inlet flow of the gas water heater" instead of "adjusting the opening of the gas proportional valve to the minimum opening Bs0Or directly closing the gas proportional valve, thereby realizing the purpose of rapidly reducing the water outlet temperature of the water outlet pipe, and sampling the second water outlet temperature T of the water outlet pipe after the interval time delta T2Therefore, the accuracy and the reliability for further determining whether the water temperature detection device is invalid are improved.
What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.

Claims (7)

1. A method for identifying a failure of a temperature detection device, the method comprising the steps of:
s1: user boiling water and simultaneously sampling inlet water temperature T of gas water heater0
S2: continuously detecting and judging opening B of gas proportional valve1Whether or not it is greater than or equal to the opening degree threshold Bs1If yes, entering the next step;
s3: sampling first outlet water temperature T of gas water heater1
S4: comparing the first outlet water temperature T1And inlet water temperature T0Whether the difference is less than or equal to a temperature threshold Ts;
s5: preliminarily determining whether the water temperature detecting means is out of order based on the comparison result;
after the water temperature detection device is determined to be invalid preliminarily, the opening degree of the gas proportional valve is adjusted to the minimum opening degree Bs0Either directly closing the gas proportional valve or increasing the gas hot waterThe water inlet flow of the device;
after the interval time delta T, sampling the second outlet water temperature T of the gas water heater2
Comparing the second outlet water temperature T2Whether it is higher than the first outlet water temperature T1And a temperature threshold Ts;
whether the water temperature detection device is out of order is further determined by the comparison result.
2. The method for identifying a failure of a temperature detecting device according to claim 1, wherein in step S5, if T is greater than T1-T0If Ts is less than or equal to Ts, preliminarily determining that the water temperature detection device fails; if T is1-T0And if the temperature is more than Ts, determining that the water temperature detection device is normal, and controlling the gas water heater to normally work until the operation is finished.
3. A method of identifying failure of a temperature sensing device according to claim 1, wherein if T is2>T1Ts, further determining that the water temperature detection device fails and sending an alarm signal, and simultaneously controlling the gas water heater to stop working; if T is2≤T1And Ts, determining that the water temperature detection device is normal, and controlling the gas water heater to resume normal operation until the operation is finished.
4. A gas water heater applying the identification method of any one of claims 1 to 3, comprising a water heater body, an air inlet pipe, an water inlet pipe and a water outlet pipe, and further comprising:
the gas proportional valve is arranged on the air inlet pipe and used for adjusting the air inlet flow of the air inlet pipe;
the water inlet temperature detection device is arranged on the water inlet pipe and is used for detecting the water inlet temperature of the water inlet pipe;
the water outlet temperature detection device is arranged on the water outlet pipe and is used for detecting the water outlet temperature of the water outlet pipe;
a controller respectively connected with the gas proportional valve and the inlet water temperature detection deviceThe water outlet temperature detection device is electrically connected and is used for comparing the first water outlet temperature T detected by the water outlet temperature detection device1And the water inlet temperature T detected by the water inlet temperature detection device0Is less than or equal to a temperature threshold value Ts, and determines whether the outlet water temperature detection means is disabled based on the comparison result.
5. The gas water heater of claim 4, wherein the controller adjusts the opening of the gas proportional valve to the minimum opening Bs0Or after the gas proportional valve is controlled to be closed, the second outlet water temperature T detected by the outlet water temperature detection device is compared2Whether it is higher than the first outlet water temperature T1And a temperature threshold value Ts, and determines again whether the outlet water temperature detection means is out of operation based on the comparison result.
6. The gas water heater of claim 4, further comprising a water proportional valve and a booster water pump, said water proportional valve being disposed on said water inlet pipe and electrically connected to said controller for regulating the flow rate of inlet water to said water inlet pipe; the booster water pump is arranged on the water inlet pipe, is electrically connected with the controller and is used for increasing the water inlet flow of the water inlet pipe; after the controller increases the inflow water flow of the water inlet pipe through the water proportional valve or the booster water pump, the controller compares the second outflow water temperature T detected by the outflow water temperature detection device2Whether it is higher than the first outlet water temperature T1And a temperature threshold value Ts, and determines again whether the outlet water temperature detection means is out of operation based on the comparison result.
7. A gas water heater according to claim 5 or 6, further comprising an alarm electrically connected to the controller, the controller controlling the alarm to emit an alarm signal upon further determining that the water temperature detection means is disabled.
CN201911202320.4A 2019-11-29 2019-11-29 Method for identifying failure of temperature detection device and gas water heater Active CN110986375B (en)

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Publication number Priority date Publication date Assignee Title
CN111981697A (en) * 2020-08-07 2020-11-24 珠海格力电器股份有限公司 Water heater outlet water temperature control method and device and water heater
CN113607452A (en) * 2021-08-03 2021-11-05 华帝股份有限公司 Method and device for detecting reverse connection of water inlet pipe and water outlet pipe

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CN104154663A (en) * 2014-08-27 2014-11-19 成都前锋电子有限责任公司 Temperature sensor active redundancy method and system based on constant temperature gas water heater
CN105276654A (en) * 2014-07-07 2016-01-27 三菱电机株式会社 Hot water apparatus and failure notification method for hot water apparatus
CN107388591A (en) * 2017-08-14 2017-11-24 广东万和热能科技有限公司 Control method, control device and the computer-readable recording medium of heating stove

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Publication number Priority date Publication date Assignee Title
CN1467455A (en) * 2002-06-14 2004-01-14 三洋电机株式会社 Water heater
CN101464051A (en) * 2007-12-19 2009-06-24 林内株式会社 Hot water supply apparatus
CN105276654A (en) * 2014-07-07 2016-01-27 三菱电机株式会社 Hot water apparatus and failure notification method for hot water apparatus
CN104154663A (en) * 2014-08-27 2014-11-19 成都前锋电子有限责任公司 Temperature sensor active redundancy method and system based on constant temperature gas water heater
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