CN117213639A - Temperature measurement window with report dirty function and fire detector - Google Patents
Temperature measurement window with report dirty function and fire detector Download PDFInfo
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- CN117213639A CN117213639A CN202311172046.7A CN202311172046A CN117213639A CN 117213639 A CN117213639 A CN 117213639A CN 202311172046 A CN202311172046 A CN 202311172046A CN 117213639 A CN117213639 A CN 117213639A
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- 238000009529 body temperature measurement Methods 0.000 title claims description 51
- 238000010438 heat treatment Methods 0.000 claims abstract description 97
- 239000000758 substrate Substances 0.000 claims abstract description 28
- 230000003321 amplification Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 8
- 239000003344 environmental pollutant Substances 0.000 abstract description 7
- 231100000719 pollutant Toxicity 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 12
- 239000000428 dust Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000000356 contaminant Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention discloses a temperature measuring window with a dirty reporting function and a fire detector. The temperature measuring window comprises a light-transmitting substrate, a heating unit, a first temperature sensor and a control module; the first temperature sensor is used for detecting the temperature of the heating unit; the control module is electrically connected with the heating unit, the first temperature sensor and the second temperature sensor, and is used for acquiring a first temperature value detected by the first temperature sensor at a set moment and a second temperature value detected by the second temperature sensor at the set moment, acquiring a third temperature value detected by the second temperature sensor when the temperature of the heating unit is increased by the first temperature value by a first set temperature threshold value, acquiring a difference value between the third temperature value and the second temperature value, determining that the temperature measuring window is polluted when the difference value is larger than or equal to the second set temperature threshold value, and outputting a dirty report instruction. The invention can solve the problems of large detection deviation of the fire detector or missing of fire alarm and the like caused by the existence of pollutants on the temperature measuring window of the fire detector.
Description
Technical Field
The invention relates to the technical field of temperature measurement, in particular to a temperature measurement window with a dirty reporting function and a fire detector.
Background
The infrared temperature fire detector utilizes the structure of an infrared temperature sensor and an infrared temperature measuring window to detect the temperature of a detected object. The industrial detector is commonly used in outdoor or humid and polluted environments, pollutants such as rain fog, sand dust and the like deposited on the surface of an infrared temperature measuring window can also influence the infrared receiving performance of an infrared temperature sensor, the condition that the detection deviation of the detector is large or the detector fails can occur, and the fire alarm is easy to miss.
Disclosure of Invention
The invention provides a temperature measuring window with a dirty reporting function and a fire detector, which can solve the problems of large detection deviation of the fire detector or missing report of fire alarm and the like caused by pollutants on the temperature measuring window of the fire detector.
According to an aspect of the present invention, there is provided a temperature measurement window having a dirty reporting function, the temperature measurement window including: the device comprises a light-transmitting substrate, a heating unit, a first temperature sensor and a control module;
when the temperature measuring window is applied to a fire detector, the light-transmitting substrate is positioned on the inner surface of the upper cover of the shell in the fire detector and covers the temperature measuring window in the upper cover of the shell; the heating unit and the first temperature sensor are positioned on the surface of the light-transmitting substrate far away from the temperature measuring window, and the vertical projection of the heating unit on the upper cover of the shell and the vertical projection of the first temperature sensor on the upper cover of the shell are not overlapped with the temperature measuring window;
the first temperature sensor is used for detecting the temperature of the heating unit;
the control module is electrically connected with the heating unit, the first temperature sensor and a second temperature sensor in the fire detector, and is used for acquiring a first temperature value detected by the first temperature sensor at a set moment and a second temperature value detected by the second temperature sensor at the set moment, acquiring a third temperature value detected by the second temperature sensor when the temperature of the heating unit is increased by the first temperature value by a first set temperature threshold, acquiring a difference value between the third temperature value and the second temperature value, determining that the temperature measuring window is polluted and outputting a dirty report instruction when the difference value is larger than or equal to the second set temperature threshold, wherein the first set temperature threshold is larger than the second set temperature threshold, and both the first set temperature threshold and the second set temperature threshold are larger than 0.
Optionally, the control module comprises an electric heating wire control circuit, a temperature sensor control circuit, a differential circuit, a comparison circuit and a signal output circuit;
the heating wire control circuit is electrically connected with the heating unit and is used for controlling the heating time of the heating unit;
the temperature sensor control circuit is electrically connected with the first temperature sensor, the second temperature sensor and the differential circuit, and is used for acquiring a first temperature value of the heating unit detected by the first temperature sensor at the set moment, acquiring a second temperature value detected by the second temperature sensor at the set moment, acquiring a fourth temperature value of the heating unit detected by the first temperature sensor after the heating unit heats for a set time, acquiring a third temperature value detected by the second temperature sensor when the fourth temperature value is equal to the sum of the first temperature value and the first set temperature threshold, and sending the second temperature value to a first input end of the differential circuit and sending the third temperature value to a second input end of the differential circuit;
the output end of the differential circuit is electrically connected with the first input end of the comparison circuit, and the differential circuit is used for determining the difference value between the second temperature value and the third temperature value;
the output end of the comparison circuit is electrically connected with the signal output circuit, the second input end of the comparison circuit is used for receiving the second set temperature threshold value, and the comparison circuit is used for comparing the difference value with the second set temperature threshold value;
the signal output circuit is used for sending out a dirty report instruction when the difference value output by the comparison circuit is greater than or equal to the second set temperature threshold value.
Optionally, the control module further comprises an operational amplifier circuit;
the operational amplification circuit is electrically connected with the first temperature sensor and the temperature sensor control circuit, and is used for amplifying the first temperature value and the fourth temperature value and then transmitting the amplified first temperature value and the amplified fourth temperature value into the temperature sensor control circuit.
Optionally, the temperature sensor control circuit further comprises an adder;
the adder is used for calculating the sum of the first temperature value and the first set temperature threshold value.
Optionally, the heating unit includes a heating wire, a first electrode, and a second electrode;
the first end of the heating wire is electrically connected with the first electrode, and the second end of the heating wire is electrically connected with the second electrode;
the heating wire surrounds at least part of the temperature measuring window;
the control module is electrically connected with the heating wire through the first electrode and the second electrode.
Optionally, the temperature measurement window provided in this embodiment further includes a power module;
the power module is used for supplying power to the control module.
Optionally, the first set temperature threshold is in a range of 20 ℃ to 30 ℃.
Optionally, the second set temperature threshold is a product of the first set temperature threshold and a set coefficient;
the setting coefficient ranges from 0 to 1.
According to another aspect of the present invention, there is provided a fire detector including a second temperature sensor and the temperature measurement window with a dirty reporting function provided in any embodiment of the present invention.
Optionally, the second temperature sensor is an infrared temperature sensor.
The embodiment provides a temperature measuring window with a dirty reporting function, which comprises a light-transmitting substrate, a control module, a heating unit and a first temperature sensor, wherein the heating unit and the first temperature sensor are positioned on the same side of the light-transmitting substrate. The first temperature sensor is used for detecting the temperature of the heating unit. When the temperature measurement window provided by the embodiment is applied to the fire detector, the temperature measurement window is positioned on the inner surface of the upper cover of the shell of the fire detector, the heating unit and the first temperature sensor are positioned on one side, far away from the upper cover of the shell, of the light-transmitting substrate, and the vertical projection of the heating unit and the first temperature sensor on the upper cover of the shell does not cover the temperature measurement window in the upper cover of the shell, so that the influence of the shielding of light passing through the temperature measurement window by the heating unit and the first temperature sensor on the temperature detected by the second temperature sensor in the fire detector is avoided. The control module is also electrically connected with the second temperature sensor, and the control module acquires a first temperature value detected by the first temperature sensor and a second temperature value detected by the second temperature sensor at set moments. When the temperature of the heating unit is increased by the first temperature value by the first set temperature threshold value, the control module obtains a third temperature value detected by the second temperature sensor. The control module determines whether the temperature measuring window is polluted according to the difference value between the third temperature value and the second set threshold value. The control module determines that the temperature measuring window is polluted and outputs a dirty report instruction when determining that the difference value is greater than or equal to a second set threshold value, so that a worker is reminded of timely checking and repairing the temperature measuring window, and the problems that the detection deviation of the fire detector is large or the fire alarm is missed due to the fact that the pollutant exists on the temperature measuring window can be improved.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a temperature measurement window with a dirty reporting function according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a front structure of a light transmissive substrate according to an embodiment of the present invention;
fig. 3 is a schematic view of a structure of an upper cover of a housing of a fire detector according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of another temperature measurement window with a dirty reporting function according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of another temperature measurement window with a dirty reporting function according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of another temperature measurement window with a dirty reporting function according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of another temperature measurement window with a dirty reporting function according to an embodiment of the present invention;
fig. 8 is a schematic structural view of a fire detector according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic structural view of a temperature measurement window with a dirty reporting function according to an embodiment of the present invention, fig. 2 is a schematic structural view of a front surface of a light-transmitting substrate according to an embodiment of the present invention, and fig. 3 is a schematic structural view of an upper cover of a housing of a fire detector according to an embodiment of the present invention, and referring to fig. 1 to fig. 3, the temperature measurement window 100 includes: the light-transmitting substrate 110, the heating unit 120, the first temperature sensor 130, and the control module 140. When the temperature measurement window 100 provided in this embodiment is applied to a fire detector, the light-transmitting substrate 110 is located on the inner surface of the upper cover 220 of the housing in the fire detector, and covers the temperature measurement window 221 in the upper cover 220 of the housing; the heating unit 120 and the first temperature sensor 130 are located on the surface of the light-transmitting substrate 110 away from the temperature measurement window 221, and the vertical projection of the heating unit 120 on the housing upper cover 220 and the vertical projection of the first temperature sensor 130 on the housing upper cover 220 are not overlapped with the temperature measurement window 221.
The first temperature sensor 130 is used to detect the temperature of the heating unit 120; the control module 140 is electrically connected to the heating unit 120, the first temperature sensor 130, and the second temperature sensor 210 in the fire detector, where the control module 140 is configured to obtain a first temperature value detected by the first temperature sensor 130 at a set time and a second temperature value detected by the second temperature sensor 210 at a set time, obtain a third temperature value detected by the second temperature sensor 210 when the temperature of the heating unit 120 is increased by the first temperature value by a first set temperature threshold, and obtain a difference value between the third temperature value and the second temperature value, and determine that the temperature measurement window is contaminated and output a dirty report instruction when the difference value is greater than or equal to the second set temperature threshold, where the first set temperature threshold is greater than the second set temperature threshold, and both the first set temperature threshold and the second set temperature threshold are greater than 0.
Specifically, the transparent substrate 110 is made of an optical material that can pass infrared, ultraviolet and visible light. The second temperature sensor 210 may be an infrared temperature sensor, and the second temperature sensor 210 is used to detect the temperature of an object outside the temperature measurement window 100.
The light-transmitting substrate 110 shown in fig. 1 is the opposite side of the light-transmitting substrate 110, and the heating unit 120 and the first temperature sensor 130 are both located on the opposite side of the light-transmitting substrate 110. Fig. 2 is a schematic diagram of a front structure of the light-transmitting substrate 110, in which the heating unit 120 and the first temperature sensor 130 are not disposed on the front surface of the light-transmitting substrate 110. Referring to fig. 3, the housing upper cover 220 includes therein a temperature measuring window 221.
When the temperature measuring window 100 provided in this embodiment is applied to a fire detector, the transparent substrate 110 covers the temperature measuring window 221, and the edge of the front surface of the transparent substrate 110 may be sealed and fixed on the inner surface of the upper cover 220 of the housing by using an adhesive. The heating unit 120 and the first temperature sensor 130 are disposed at a side of the light-transmitting substrate 110 away from the housing upper cover 220, so that the heating unit 120 and the first temperature sensor 130 are protected from being contaminated by external moisture, dust, and the like. The vertical projection of the heating unit 120 and the first temperature sensor 130 on the upper cover 220 of the housing is not overlapped with the temperature measuring window 221, so that the influence of the light passing through the temperature measuring window 221 and the influence of the detection accuracy of the second temperature sensor 210 on the heating unit 120 and the first temperature sensor 130 can be avoided.
The control module 140 in the temperature measurement window 100 provided in this embodiment may be integrated with the control module in the fire detector. The first temperature value and the second temperature value are both obtained at a set time, that is, the control module 140 may obtain the first temperature value detected by the first temperature sensor 130 and the second temperature value detected by the second temperature sensor 210 at the same time. The set time may be a time after the first temperature sensor 130 and the second temperature sensor 210 are powered on, and at the set time, both the first temperature sensor 130 and the second temperature sensor 210 are in an operating state.
When the control module 140 detects that the temperature of the heating unit 120 is increased by the first temperature value by the first set temperature threshold through the first temperature sensor 130, the temperature of the heating unit 120 is the sum of the first temperature value and the first set temperature threshold, and at this time, the control module 140 acquires the third temperature value detected by the second temperature sensor 210. The control module 140 is further configured to compare the difference between the third temperature value and the second temperature value with a second set threshold, and if the difference is greater than or equal to the second set threshold, determine that the temperature measurement window 100 is contaminated, that is, that there is a contaminant on the temperature measurement window 100, where the contaminant covered on the temperature measurement window 100 may be water vapor, mist, dust, etc. After the temperature measuring window 100 is polluted, the temperature of the measured object outside the temperature measuring window 100 cannot effectively reach the second temperature sensor 210 in the temperature measuring window 100, a large amount of temperature attenuation is generated, and at this time, the second temperature sensor 210 measures the change of the temperature field in the temperature measuring window 100. The temperature measurement window 100 provided in this embodiment can output a dirty report instruction after determining that the temperature measurement window 100 has contaminants, thereby ensuring the effectiveness of the fire detector in detecting the temperature of an object outside the temperature measurement window, reducing the occurrence of false alarm, missing report and the like, and ensuring that the fire detector can be suitable for severe environments such as sand dust, rain fog and the like.
The embodiment provides a temperature measuring window with a dirty reporting function, which comprises a light-transmitting substrate, a control module, a heating unit and a first temperature sensor, wherein the heating unit and the first temperature sensor are positioned on the same side of the light-transmitting substrate. The first temperature sensor is used for detecting the temperature of the heating unit. When the temperature measurement window provided by the embodiment is applied to the fire detector, the temperature measurement window is positioned on the inner surface of the upper cover of the shell of the fire detector, the heating unit and the first temperature sensor are positioned on one side, far away from the upper cover of the shell, of the light-transmitting substrate, and the vertical projection of the heating unit and the first temperature sensor on the upper cover of the shell does not cover the temperature measurement window in the upper cover of the shell, so that the influence of the shielding of light passing through the temperature measurement window by the heating unit and the first temperature sensor on the temperature detected by the second temperature sensor in the fire detector is avoided. The control module is also electrically connected with the second temperature sensor, and the control module acquires a first temperature value detected by the first temperature sensor and a second temperature value detected by the second temperature sensor at set moments. When the temperature of the heating unit is increased by the first temperature value by the first set temperature threshold value, the control module obtains a third temperature value detected by the second temperature sensor. The control module determines whether the temperature measuring window is polluted according to the difference value between the third temperature value and the second set threshold value. The control module determines that the temperature measuring window is polluted and outputs a dirty report instruction when determining that the difference value is greater than or equal to a second set threshold value, so that a worker is reminded of timely checking and repairing the temperature measuring window, and the problems that the detection deviation of the fire detector is large or the fire alarm is missed due to the fact that the pollutant exists on the temperature measuring window can be improved.
Optionally, fig. 4 is a schematic structural diagram of a temperature measurement window with a dirty reporting function according to an embodiment of the present invention, and referring to fig. 4, the control module 140 includes a heating wire control circuit 141, a temperature sensor control circuit 142, a differential circuit 143, a comparison circuit 144, and a signal output circuit 145; the heating wire control circuit 141 is electrically connected with the heating unit 120, and the heating wire control circuit 141 is used for controlling the heating time of the heating unit 120; the temperature sensor control circuit 142 is electrically connected to the first temperature sensor 130, the second temperature sensor 210 and the differential circuit 143, where the temperature sensor control circuit 142 is configured to obtain a first temperature value detected by the first temperature sensor 130 at a set time, obtain a second temperature value detected by the second temperature sensor 210 at the set time, and obtain a fourth temperature value of the heating unit 120 after the heating unit 120 heats for a set time, and obtain a third temperature value detected by the second temperature sensor 210 when the fourth temperature value is equal to a sum of the first temperature value and the first set temperature threshold, and further configured to send the second temperature value to a first input terminal of the differential circuit 143 and send the third temperature value to a second input terminal of the differential circuit 143. The output end of the differential circuit 143 is electrically connected with the first input end of the comparison circuit 144, and the differential circuit 143 is used for determining the difference value between the second temperature value and the third temperature value; the output end of the comparison circuit 144 is electrically connected with the signal output circuit 145, the second input end of the comparison circuit 144 is used for receiving a second set temperature threshold value, and the comparison circuit 144 is used for comparing the difference value with the second set temperature threshold value; the signal output circuit 145 is configured to issue a dirty report instruction when the difference output by the comparison circuit 144 is greater than or equal to the second set temperature threshold.
Specifically, the heating wire control circuit 141 may include a PID control circuit, which may control the heating time and the stop heating time of the heating unit 120. The temperature sensor control circuit 142 may obtain a temperature value detected by the first temperature sensor 130 and a temperature value detected by the second temperature sensor 210, and the temperature sensor control circuit 142 is further configured to obtain a third temperature value detected by the second temperature sensor 210 when the temperature value detected by the first temperature sensor 130 is equal to a sum of the first temperature value and the first set temperature threshold. The difference circuit 143 may calculate a difference between the second temperature value and the third temperature value. The comparing circuit 144 can compare the difference value with the second set temperature threshold value, and send a first signal to the signal output circuit 145 when the difference value is greater than or equal to the second set temperature threshold value, and the signal output circuit 145 sends a dirty report instruction after receiving the first signal, so as to inform the staff that the temperature measurement window 100 is polluted.
Optionally, fig. 5 is a schematic structural diagram of another temperature measurement window with a dirty reporting function according to an embodiment of the present invention, and referring to fig. 5, the control module 140 further includes an operational amplifier 146; the operational amplifier circuit 146 is electrically connected to the first temperature sensor 130 and the temperature sensor control circuit 142, and the operational amplifier circuit 146 is configured to amplify the first temperature value and the fourth temperature value and transmit the amplified first temperature value and the fourth temperature value to the temperature sensor control circuit 142.
Specifically, since the first temperature sensor 130 transmits the signal indicating the first temperature value and the signal indicating the fourth temperature value to the temperature sensor control circuit 142 are small, the temperature sensor control circuit 142 is not easy to identify, and thus the operational amplification circuit 146 is configured to amplify the signal indicating the first temperature value and the signal indicating the fourth temperature value and transmit the amplified signals to the temperature sensor control circuit 142, so that the temperature sensor control circuit 142 can accurately identify the signal indicating the temperature value detected by the first temperature sensor 130.
Optionally, the temperature sensor control circuit further comprises an adder; the adder is used for calculating the sum of the first temperature value and the first set temperature threshold value.
Specifically, an adder is arranged in the temperature sensor control circuit, and the sum of the first temperature value and the first set temperature threshold value is calculated through the adder, so that the temperature sensor control circuit can timely acquire the third temperature value detected by the second temperature sensor when detecting that the fourth temperature value is equal to the sum of the first temperature value and the first set temperature threshold value.
Optionally, fig. 6 is a schematic structural diagram of a temperature measurement window with a dirty reporting function according to an embodiment of the present invention, and referring to fig. 6, the heating unit includes a heating wire 121, a first electrode 122, and a second electrode 123; a first end of the heating wire 121 is electrically connected to the first electrode 122, and a second end of the heating wire 121 is electrically connected to the second electrode 123; heating wire 121 surrounds at least a portion of the temperature window; the control module 140 is electrically connected to the heating wire 121 through the first electrode 122 and the second electrode 123.
Specifically, the heating wire control circuit 141 in the control module 140 is electrically connected to the heating wire 121 through the first electrode 122 and the second electrode 123. The first electrode 122 and the second electrode 123 are disposed in the heating unit, and one end of a wire may be welded to the first electrode 122 and the second electrode 123, and the other end of the wire is connected with the control module 140, thereby facilitating the control module 140 to be electrically connected with the heating wire 121.
Optionally, fig. 7 is a schematic structural diagram of another temperature measurement window with a dirty reporting function according to an embodiment of the present invention, and referring to fig. 7, the temperature measurement window provided in this embodiment further includes a power module 150; the power module 150 is used to power the control module 140.
Specifically, the power module 150 may be electrically connected to the heating wire control circuit 141, the operational amplifier circuit 146, the temperature sensor control circuit 142, the differential circuit 143, the comparison circuit 144, and the signal output circuit 145 in the control module 140, and power the heating wire control circuit 141, the operational amplifier circuit 146, the temperature sensor control circuit 142, the differential circuit 143, the comparison circuit 144, and the signal output circuit 145.
Optionally, the first set temperature threshold is in the range of 20 ℃ to 30 ℃.
Specifically, the first set temperature threshold is any value of 20 to 30 ℃. The control module may randomly set a first set temperature threshold value after the first temperature value is obtained when detecting whether the temperature measurement window is polluted or not, and the first set temperature threshold value set each time is within a range of 20 ℃ to 30 ℃, and in an exemplary embodiment, the control module may set the first set temperature threshold value to 21 ℃ after the first temperature value is obtained when detecting whether the temperature measurement window is polluted or not for the first time, and the control module may set the first set temperature threshold value to 25 ℃ after the first temperature value is obtained when detecting whether the temperature measurement window is polluted or not for the second time.
The range of the first set temperature threshold is set to be 20-30 ℃, so that the time for the heating unit to lift the first set temperature threshold is not too long or too short, and the control module can detect whether the temperature measuring window is polluted by pollutants or not at proper intervals.
Optionally, the second set temperature threshold is a product of the first set temperature threshold and a set coefficient; the range of the setting coefficient is 0 to 1.
Specifically, the control module may set a setting coefficient randomly after the first temperature value is obtained when detecting whether the temperature measurement window is polluted or not each time, and the setting coefficient set each time is within a range of 0 to 1, and exemplary, the control module may set the setting coefficient to 0.3 after the first temperature value is obtained when detecting whether the temperature measurement window is polluted for the first time, and the control module may set the setting coefficient to 0.5 after the first temperature value is obtained when detecting whether the temperature measurement window is polluted for the second time.
Fig. 8 is a schematic structural diagram of a fire detector according to an embodiment of the present invention, and referring to fig. 8, the fire detector provided in this embodiment includes a second temperature sensor 210 and a temperature measurement window with a dirty reporting function provided in any embodiment of the present invention.
Specifically, the fire detector provided by the embodiment is provided with the temperature measuring window with the dirty reporting function, and the temperature measuring window can be found in time when pollutants exist in the temperature measuring window, so that staff can clean the polluted temperature measuring window in time, and the problem that the fire detector is insensitive in detection is avoided.
The fire detector provided in this embodiment further includes an upper case cover 220 and a lower case cover 230, and the second temperature sensor 210, the light-transmitting substrate 110 in the temperature measuring window, the heating unit 120, the first temperature sensor 130, and the control module 140 are located between the upper case cover 220 and the lower case cover 230.
Optionally, the second temperature sensor is an infrared temperature sensor, so that the second temperature sensor can detect the temperature of an object outside the temperature measuring window under the condition of not contacting with the measured object, and the detection sensitivity of the fire detector is improved.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. A temperature measurement window with report dirty function, characterized by comprising: the device comprises a light-transmitting substrate, a heating unit, a first temperature sensor and a control module;
when the temperature measuring window is applied to a fire detector, the light-transmitting substrate is positioned on the inner surface of the upper cover of the shell in the fire detector and covers the temperature measuring window in the upper cover of the shell; the heating unit and the first temperature sensor are positioned on the surface of the light-transmitting substrate far away from the temperature measuring window, and the vertical projection of the heating unit on the upper cover of the shell and the vertical projection of the first temperature sensor on the upper cover of the shell are not overlapped with the temperature measuring window;
the first temperature sensor is used for detecting the temperature of the heating unit;
the control module is electrically connected with the heating unit, the first temperature sensor and a second temperature sensor in the fire detector, and is used for acquiring a first temperature value detected by the first temperature sensor at a set moment and a second temperature value detected by the second temperature sensor at the set moment, acquiring a third temperature value detected by the second temperature sensor when the temperature of the heating unit is increased by the first temperature value by a first set temperature threshold, acquiring a difference value between the third temperature value and the second temperature value, determining that the temperature measuring window is polluted and outputting a dirty report instruction when the difference value is larger than or equal to the second set temperature threshold, wherein the first set temperature threshold is larger than the second set temperature threshold, and both the first set temperature threshold and the second set temperature threshold are larger than 0.
2. The temperature window of claim 1, wherein the control module comprises a heating wire control circuit, a temperature sensor control circuit, a differential circuit, a comparison circuit, and a signal output circuit;
the heating wire control circuit is electrically connected with the heating unit and is used for controlling the heating time of the heating unit;
the temperature sensor control circuit is electrically connected with the first temperature sensor, the second temperature sensor and the differential circuit, and is used for acquiring a first temperature value of the heating unit detected by the first temperature sensor at the set moment, acquiring a second temperature value detected by the second temperature sensor at the set moment, acquiring a fourth temperature value of the heating unit detected by the first temperature sensor after the heating unit heats for a set time, acquiring a third temperature value detected by the second temperature sensor when the fourth temperature value is equal to the sum of the first temperature value and the first set temperature threshold, and sending the second temperature value to a first input end of the differential circuit and sending the third temperature value to a second input end of the differential circuit;
the output end of the differential circuit is electrically connected with the first input end of the comparison circuit, and the differential circuit is used for determining the difference value between the second temperature value and the third temperature value;
the output end of the comparison circuit is electrically connected with the signal output circuit, the second input end of the comparison circuit is used for receiving the second set temperature threshold value, and the comparison circuit is used for comparing the difference value with the second set temperature threshold value;
the signal output circuit is used for sending out a dirty report instruction when the difference value output by the comparison circuit is greater than or equal to the second set temperature threshold value.
3. The temperature window of claim 2, wherein the control module further comprises an operational amplifier circuit;
the operational amplification circuit is electrically connected with the first temperature sensor and the temperature sensor control circuit, and is used for amplifying the first temperature value and the fourth temperature value and then transmitting the amplified first temperature value and the amplified fourth temperature value into the temperature sensor control circuit.
4. The temperature window of claim 1, wherein the temperature sensor control circuit further comprises an adder;
the adder is used for calculating the sum of the first temperature value and the first set temperature threshold value.
5. The temperature window of claim 1, wherein the heating unit comprises a heating wire, a first electrode, and a second electrode;
the first end of the heating wire is electrically connected with the first electrode, and the second end of the heating wire is electrically connected with the second electrode;
the heating wire surrounds at least part of the temperature measuring window;
the control module is electrically connected with the heating wire through the first electrode and the second electrode.
6. The thermal window of claim 1, further comprising a power module;
the power module is used for supplying power to the control module.
7. The temperature window of claim 1, wherein the first set temperature threshold is in the range of 20 ℃ to 30 ℃.
8. The temperature window of claim 1, wherein the second set temperature threshold is a product of the first set temperature threshold and a set coefficient;
the setting coefficient ranges from 0 to 1.
9. A fire detector comprising a second temperature sensor and a temperature measurement window having a dirty reporting function as claimed in any one of claims 1 to 8.
10. The fire detector of claim 9, wherein the second temperature sensor is an infrared temperature sensor.
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| CN202311172046.7A CN117213639A (en) | 2023-09-12 | 2023-09-12 | Temperature measurement window with report dirty function and fire detector |
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