Thermal flow measurement device with diagnostic function

Abstract

The present invention discloses a thermal flow measurement device with a diagnostic function, comprising a pipeline, a heating probe, an integrated probe, a temperature probe and a diagnostic unit, wherein the heating probe, the integrated probe and the temperature probe are sequentially arranged inside the pipeline along the flow direction of the fluid. The diagnostic unit is used to determine the temperature difference between the heating probe and the integrated probe, the temperature difference between the heating probe and the temperature probe, and the temperature difference between the integrated probe and the temperature probe, and to determine the corresponding flow value according to the above three temperature differences, and to obtain the working status of the heating probe, the integrated probe and the temperature probe according to the determined flow value. By arranging the heating probe, the integrated probe and the temperature probe inside the pipeline, the present invention can not only achieve the effect of measuring the flow, but also determine the working status of each probe according to multiple flow values, so as to determine the faulty probe at the first time, thereby improving the working stability of the overall flow measurement device.

Description

Technical Field

[0001] The invention relates to the technical field of metering equipment, in particular to a thermal flow measurement device with a diagnostic function. Background Art

[0002] Thermal flow measurement technology is a relatively new flow measurement technology. Its principle is to install a heating probe and a temperature probe in the pipeline that conveys the fluid. The heating probe heats the fluid in the pipeline after being powered on, and the temperature probe below detects the temperature of the fluid. The faster the flow rate of the fluid in the pipeline, that is, the greater the flow rate, the greater the temperature difference between the temperature detected by the temperature probe and the temperature of the heating probe. Therefore, the flow rate of the fluid can be determined based on the temperature difference between the two.

[0003] Since the flow rate is determined indirectly by measuring the temperature, the working accuracy and stability of the heating probe and the temperature probe are very high. However, with the accumulation of working time and the difference in maintenance conditions, the working stability of the heating probe and the temperature probe will inevitably decrease. When one of them fails, it will seriously affect the metering of the fluid. Therefore, it is particularly important to discover potential faults in advance. However, there is little technology in the prior art to diagnose the status of the heating probe and the temperature probe in the thermal flow measurement device. Summary of the invention

[0004] The embodiment of the present invention provides a thermal flow measurement device with a diagnostic function, so as to solve the problem in the prior art that the states of a heating probe and a temperature probe cannot be effectively diagnosed.

[0005] On the one hand, an embodiment of the present invention provides a thermal flow measurement device with a diagnostic function, comprising a pipeline, a heating probe, a comprehensive probe, a temperature probe and a diagnostic unit, wherein the heating probe, the comprehensive probe and the temperature probe are sequentially arranged inside the pipeline along the flow direction of the fluid;

[0006] The heating probe is used to heat the fluid in the pipeline, and the integrated probe is used to heat the fluid in the pipeline. At the same time, the integrated probe is also used to detect the temperature of the fluid in the pipeline, and the temperature probe is used to detect the temperature of the fluid in the pipeline;

[0007] The diagnostic unit is used to determine the temperature difference between the heating probe and the integrated probe, the temperature difference between the heating probe and the temperature probe, and the temperature difference between the integrated probe and the temperature probe, and to determine the corresponding flow value based on the above three temperature differences. The diagnostic unit is also used to obtain the working status of the heating probe, the integrated probe, and the temperature probe based on the determined flow value.

[0008] In one possible implementation, the diagnostic unit determines a first flow value based on a temperature difference between the heating probe and the integrated probe, and determines a second flow value based on a temperature difference between the integrated probe and the temperature probe. When the difference between the first flow value and the second flow value is less than a set threshold, the diagnostic unit determines that the heating probe, the integrated probe, and the temperature probe are all in normal working conditions.

[0009] In a possible implementation, when the difference between the first flow value and the second flow value is greater than or equal to a set threshold, and the difference between the first flow value and the reference flow value is less than the set threshold, the diagnostic unit determines that the integrated probe or the temperature probe fails.

[0010] In one possible implementation, the integrated probe includes an integrated heating probe and an integrated temperature probe, which are used to heat the fluid in the pipeline and detect the temperature of the fluid in the pipeline, respectively; when the difference between the first flow value and the second flow value is greater than or equal to a set threshold, and the difference between the first flow value and the reference flow value is less than the set threshold, the diagnostic unit determines that the integrated heating probe or the temperature probe is faulty.

[0011] In one possible implementation, the diagnostic unit determines the third flow value based on the temperature difference between the heating probe and the temperature probe; when the difference between the first flow value and the second flow value is greater than or equal to the set threshold, and the difference between the first flow value and the reference flow value is less than the set threshold, and the difference between the third flow value and the reference flow value is less than the set threshold, the diagnostic unit determines that the integrated heating probe is faulty.

[0012] In one possible implementation, the diagnostic unit determines the third flow value based on the temperature difference between the heating probe and the temperature probe; when the difference between the first flow value and the second flow value is greater than or equal to a set threshold, and the difference between the first flow value and the reference flow value is less than the set threshold, and the difference between the third flow value and the reference flow value is greater than or equal to the set threshold, the diagnostic unit determines that the temperature probe is faulty.

[0013] In one possible implementation, the integrated probe includes an integrated heating probe and an integrated temperature probe, which are used to heat the fluid in the pipeline and detect the temperature of the fluid in the pipeline, respectively; when the difference between the first flow value and the second flow value is greater than or equal to a set threshold, and the difference between the second flow value and the reference flow value is less than the set threshold, the diagnostic unit determines that the heating probe or the integrated temperature probe is faulty.

[0014] In one possible implementation, the diagnostic unit determines the third flow value based on the temperature difference between the heating probe and the temperature probe; when the difference between the first flow value and the second flow value is greater than or equal to a set threshold, and the difference between the second flow value and the reference flow value is less than the set threshold, and the difference between the third flow value and the reference flow value is less than the set threshold, the diagnostic unit determines that the integrated temperature probe is faulty.

[0015] In one possible implementation, the diagnostic unit determines the third flow value based on the temperature difference between the heating probe and the temperature probe; when the difference between the first flow value and the second flow value is greater than or equal to a set threshold, and the difference between the second flow value and the reference flow value is less than the set threshold, and the difference between the third flow value and the reference flow value is greater than or equal to the set threshold, the diagnostic unit determines that the heating probe is faulty.

[0016] In a possible implementation, the integrated probe further includes a shell, and the integrated heating probe and the integrated temperature probe are both arranged inside the shell.

[0017] The thermal flow measurement device with diagnostic function in the present invention has the following advantages:

[0018] By setting a heating probe, an integrated probe and a temperature probe inside the pipeline and determining the corresponding flow value according to the temperature difference between each probe, not only can the flow measurement effect be achieved, but also the working status of each probe can be determined according to multiple flow values, so as to identify the faulty probe at the first time and improve the working stability of the overall flow measurement device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of a pipeline and its internal equipment in a thermal flow measurement device with diagnostic function provided by an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of the structure of an integrated probe provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Figure 1 and Figure 2 A schematic diagram of the structure of a thermal flow measurement device with a diagnostic function provided by an embodiment of the present invention. The embodiment of the present invention provides a thermal flow measurement device with a diagnostic function, comprising a pipeline 100, a heating probe 200, an integrated probe 300, a temperature probe 400 and a diagnostic unit, wherein the heating probe 200, the integrated probe 300 and the temperature probe 400 are sequentially arranged inside the pipeline 100 along the flow direction of the fluid;

[0024] The heating probe 200 is used to heat the fluid in the pipeline 100, the integrated probe 300 is used to heat the fluid in the pipeline 100, and the integrated probe 300 is also used to detect the temperature of the fluid in the pipeline 100, and the temperature probe 400 is used to detect the temperature of the fluid in the pipeline 100;

[0025] The diagnostic unit is used to determine the temperature difference between the heating probe 200 and the integrated probe 300, the temperature difference between the heating probe 200 and the temperature probe 400, and the temperature difference between the integrated probe 300 and the temperature probe 400, and to determine the corresponding flow values ​​according to the above three temperature differences. The diagnostic unit is also used to obtain the working status of the heating probe 200, the integrated probe 300, and the temperature probe 400 according to the determined flow values.

[0026] Exemplarily, the integrated probe 300 includes an integrated heating probe 310 and an integrated temperature probe 320 , and the integrated heating probe 310 and the integrated temperature probe 320 are used to heat the fluid in the pipeline 100 and detect the temperature of the fluid in the pipeline 100 , respectively.

[0027] The heating probe 200 and the integrated heating probe 310 can generate heat after being powered on, thereby heating the fluid in the pipeline 100. The voltage of the heating probe 200 and the integrated heating probe 310 remains unchanged during operation, and the current passed into the heating probe 200 and the integrated heating probe 310 can be adjusted under the control of the diagnostic unit, thereby changing the heating power, so that the temperature of the heating probe 200 and the integrated heating probe 310 is controlled. In some embodiments, when the model of the heating probe 200 and the integrated heating probe 310 is determined, the diagnostic unit can determine the corresponding temperature by the magnitude of the current passed into the heating probe 200 and the integrated heating probe 310, and when the fluid in the pipeline 100 is determined, and the positions of the heating probe 200, the integrated probe 300 and the temperature probe 400 in the pipeline 100 are also determined, the diagnostic unit can determine the corresponding flow value according to the above temperature difference.

[0028] In an embodiment of the present invention, the heating probe 200, the integrated probe 300 and the temperature probe 400 all include a probe body and a mounting body, one end of the probe body is inserted into the mounting body, and the other end is inserted into the pipe 100, and the mounting body is fixedly arranged on the outer surface of the pipe 100. The probe body is used to convert electricity into heat or heat into electrical signals, and a corresponding driving circuit board is arranged inside the mounting body so that the diagnostic unit can exchange information with each probe. In order to improve the sealing performance after the probe body is inserted into the pipe 100, a sealing gasket can be arranged in the jack for inserting the probe body opened on the side of the pipe 100. The sealing gasket can be made of materials such as rubber. When the probe body is inserted into the sealing gasket, the inside and outside of the pipe 100 can be isolated.

[0029] In a possible embodiment, the diagnostic unit determines a first flow value according to a temperature difference between the heating probe 200 and the integrated probe 300, and determines a second flow value according to a temperature difference between the integrated probe 300 and the temperature probe 400. When the difference between the first flow value and the second flow value is less than a set threshold, the diagnostic unit determines that the heating probe 200, the integrated probe 300, and the temperature probe 400 are all in a normal working state.

[0030] Exemplarily, the above-mentioned operations of determining the first flow value and the second flow value need to be performed separately, that is, the first flow value is determined first, and when the heating probe 200 is powered off and the temperature drops to the same temperature as the fluid, the determination of the second flow value is started to prevent the heating probe 200 from heating the fluid and causing the temperature detected by the temperature probe 400 to be adversely affected.

[0031] In the embodiment of the present invention, since the integrated heating probe 310 and the integrated temperature probe 320 in the integrated probe 300 are separate probes, when it is determined that the difference between the first flow value and the second flow value is less than the set threshold, the working states of the above-mentioned probes may be as follows: first, all probes are normal, second, the heating probe 200 and the integrated temperature probe 320 are both faulty, third, the integrated heating probe 310 and the temperature probe 400 are both faulty, and fourth, all probes are faulty. Since the probability of two or more probes failing at the same time is very small, the present invention ignores the possibility of two or more probes failing at the same time when determining the working state of the probe, and therefore, when the difference between the first flow value and the second flow value is less than the set threshold, it is considered that all probes are normal.

[0032] In a possible embodiment, when the difference between the first flow value and the second flow value is greater than or equal to a set threshold, and the difference between the first flow value and the reference flow value is less than the set threshold, the diagnostic unit determines that the integrated probe 300 or the temperature probe 400 is faulty.

[0033] Exemplarily, the reference flow value may be a flow value measured when all probes are in a normal state. Since the flow rate of the fluid in the pipeline 100 does not change greatly, when each probe is in a normal state, it is necessary to measure the flow rate of the fluid in the pipeline 100 in real time, and use the latest measured flow value as the reference flow value. If the difference between the first flow value and the second flow value reaches or exceeds the set threshold, it means that a probe in the combination of the heating probe 200 and the integrated temperature probe 320, and the combination of the integrated heating probe 310 and the temperature probe 400 has failed. If it is further determined that the difference between the first flow value and the reference flow value is less than the set threshold, it means that the difference between the second flow value and the reference flow value is greater than or equal to the set threshold, and it can be considered that a probe in the combination of the integrated probe 300 and the temperature probe 400 has failed, that is, the integrated probe 300 or the temperature probe 400 has failed, specifically, the integrated heating probe 310 or the temperature probe 400 has failed.

[0034] If, on the basis that the difference between the first flow value and the second flow value reaches or exceeds the set threshold, it is further determined that the difference between the second flow value and the reference flow value is less than the set threshold, it means that the difference between the first flow value and the reference flow value is greater than or equal to the set threshold, and it can be considered that a probe in the combination of the heating probe 200 and the integrated temperature probe 320 has failed, that is, the heating probe 200 or the integrated temperature probe 320 has failed.

[0035] In a possible embodiment, the diagnostic unit determines the third flow value based on the temperature difference between the heating probe 200 and the temperature probe 400; when the difference between the first flow value and the second flow value is greater than or equal to the set threshold, and the difference between the first flow value and the reference flow value is less than the set threshold, and the difference between the third flow value and the reference flow value is less than the set threshold, the diagnostic unit determines that the integrated heating probe 310 is faulty.

[0036] For example, since the fault range determined above is still relatively large, it is necessary to further determine the third flow value to determine the specific faulty probe. If, on the basis that the difference between the first flow value and the second flow value is greater than or equal to the set threshold, it is further determined that the difference between the first flow value and the reference flow value is less than the set threshold, and the difference between the third flow value and the reference flow value is less than the set threshold, and since the third flow value is related to the temperature probe 400, and the third flow value related to the temperature probe 400 is normal, it is considered that the temperature probe 400 is also in a normal working state, and it can be determined that the integrated heating probe 310 is faulty.

[0037] If, on the basis that the difference between the first flow value and the second flow value is greater than or equal to the set threshold, it is further determined that the difference between the first flow value and the reference flow value is less than the set threshold, and the difference between the third flow value and the reference flow value is greater than or equal to the set threshold, given that the third flow value is related to the temperature probe 400, and the third flow value related to the temperature probe 400 is abnormal, it is considered that the temperature probe 400 is also faulty.

[0038] If, on the basis that the difference between the first flow value and the second flow value is greater than or equal to the set threshold, it is further determined that the difference between the second flow value and the reference flow value is less than the set threshold, and the difference between the third flow value and the reference flow value is less than the set threshold, and since the third flow value is related to the heating probe 200, and the third flow value related to the heating probe 200 is normal, it is considered that the heating probe 200 is also in a normal working state, and it can be determined that the integrated temperature probe 320 is faulty.

[0039] If, on the basis that the difference between the first flow value and the second flow value is greater than or equal to the set threshold, it is further determined that the difference between the second flow value and the reference flow value is less than the set threshold, and the difference between the third flow value and the reference flow value is greater than or equal to the set threshold, given that the third flow value is related to the heating probe 200, and the third flow value related to the heating probe 200 is abnormal, it is considered that the heating probe 200 also has a fault.

[0040] At this point, the working status of all the above probes has been determined.

[0041] In a possible embodiment, the integrated probe 300 further includes a shell 301 , and the integrated heating probe 310 and the integrated temperature probe 320 are both disposed inside the shell 301 .

[0042] Exemplarily, the housing 301 is used to combine the integrated heating probe 310 and the integrated temperature probe 320. To prevent the high temperature generated by the integrated heating probe 310 from adversely affecting the integrated temperature probe 320, a baffle 330 may be provided inside the housing 301 to separate the integrated heating probe 310 from the integrated temperature probe 320. The baffle 330 may be made of a heat-insulating material. Furthermore, to allow the fluid in the pipeline 100 to fully contact the integrated heating probe 310 and the integrated temperature probe 320, a plurality of through holes may be provided on the side of the housing 301.

[0043] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0044] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A thermal flow measurement device with diagnostic function, characterized in that: Comprising a pipeline (100), a heating probe (200), an integrated probe (300), a temperature probe (400), and a diagnostic unit, wherein the heating probe (200), the integrated probe (300), and the temperature probe (400) are sequentially arranged inside the pipeline (100) along the flow direction of the fluid; The heating probe (200) is used to heat the fluid in the pipeline (100), the integrated probe (300) is used to heat the fluid in the pipeline (100), and the integrated probe (300) is also used to detect the temperature of the fluid in the pipeline (100), and the temperature probe (400) is used to detect the temperature of the fluid in the pipeline (100); The diagnostic unit is used to determine the temperature difference between the heating probe (200) and the integrated probe (300), the temperature difference between the heating probe (200) and the temperature probe (400), and the temperature difference between the integrated probe (300) and the temperature probe (400), and to determine corresponding flow values ​​according to the three temperature differences; the diagnostic unit is also used to obtain the working states of the heating probe (200), the integrated probe (300), and the temperature probe (400) according to the determined flow values; The diagnostic unit determines a first flow value according to a temperature difference between the heating probe (200) and the integrated probe (300), and the diagnostic unit determines a second flow value according to a temperature difference between the integrated probe (300) and the temperature probe (400), and when the difference between the first flow value and the second flow value is less than a set threshold, the diagnostic unit determines that the heating probe (200), the integrated probe (300), and the temperature probe (400) are all in a normal working state; When the difference between the first flow value and the second flow value is greater than or equal to the set threshold, and the difference between the first flow value and the reference flow value is less than the set threshold, the diagnostic unit determines that the integrated probe (300) or the temperature probe (400) has a fault; The integrated probe (300) comprises an integrated heating probe (310) and an integrated temperature probe (320), wherein the integrated heating probe (310) and the integrated temperature probe (320) are respectively used to heat the fluid in the pipeline (100) and detect the temperature of the fluid in the pipeline (100); When the difference between the first flow value and the second flow value is greater than or equal to the set threshold, and the difference between the first flow value and the reference flow value is less than the set threshold, the diagnostic unit determines that the integrated heating probe (310) or the temperature probe (400) has failed.

2. The thermal flow measurement device with diagnostic function according to claim 1, characterized in that: The diagnostic unit determines a third flow value according to a temperature difference between the heating probe (200) and the temperature probe (400); When the difference between the first flow value and the second flow value is greater than or equal to the set threshold, and the difference between the first flow value and the reference flow value is less than the set threshold, and the difference between the third flow value and the reference flow value is less than the set threshold, the diagnostic unit determines that the integrated heating probe (310) has a fault.

3. The thermal flow measurement device with diagnostic function according to claim 1, characterized in that: The diagnostic unit determines a third flow value according to a temperature difference between the heating probe (200) and the temperature probe (400); When the difference between the first flow value and the second flow value is greater than or equal to the set threshold, and the difference between the first flow value and the reference flow value is less than the set threshold, and the difference between the third flow value and the reference flow value is greater than or equal to the set threshold, the diagnostic unit determines that the temperature probe (400) has a fault.

4. The thermal flow measurement device with diagnostic function according to claim 1, characterized in that: The integrated probe (300) comprises an integrated heating probe (310) and an integrated temperature probe (320), wherein the integrated heating probe (310) and the integrated temperature probe (320) are respectively used to heat the fluid in the pipeline (100) and detect the temperature of the fluid in the pipeline (100); When the difference between the first flow value and the second flow value is greater than or equal to the set threshold, and the difference between the second flow value and the reference flow value is less than the set threshold, the diagnostic unit determines that the heating probe (200) or the integrated temperature probe (320) has failed.

5. The thermal flow measurement device with diagnostic function according to claim 4, characterized in that: The diagnostic unit determines a third flow value according to a temperature difference between the heating probe (200) and the temperature probe (400); When the difference between the first flow value and the second flow value is greater than or equal to the set threshold, and the difference between the second flow value and the reference flow value is less than the set threshold, and the difference between the third flow value and the reference flow value is less than the set threshold, the diagnostic unit determines that the integrated temperature probe (320) has a fault.

6. The thermal flow measurement device with diagnostic function according to claim 4, characterized in that: The diagnostic unit determines a third flow value according to a temperature difference between the heating probe (200) and the temperature probe (400); When the difference between the first flow value and the second flow value is greater than or equal to the set threshold, and the difference between the second flow value and the reference flow value is less than the set threshold, and the difference between the third flow value and the reference flow value is greater than or equal to the set threshold, the diagnostic unit determines that the heating probe (200) has a fault.

7. The thermal flow measurement device with diagnostic function according to claim 1 or 4, characterized in that: The integrated probe (300) further comprises a shell (301), and the integrated heating probe (310) and the integrated temperature probe (320) are both arranged inside the shell (301).

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