CN216050088U - double-U-shaped thermal difference type flow detection probe - Google Patents
double-U-shaped thermal difference type flow detection probe Download PDFInfo
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- CN216050088U CN216050088U CN202122193660.4U CN202122193660U CN216050088U CN 216050088 U CN216050088 U CN 216050088U CN 202122193660 U CN202122193660 U CN 202122193660U CN 216050088 U CN216050088 U CN 216050088U
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- 239000000523 sample Substances 0.000 title claims abstract description 23
- 238000001514 detection method Methods 0.000 title claims abstract description 14
- 230000001681 protective effect Effects 0.000 claims abstract description 19
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 18
- 239000010935 stainless steel Substances 0.000 claims abstract description 18
- 239000004065 semiconductor Substances 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 239000000945 filler Substances 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 4
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 239000012530 fluid Substances 0.000 abstract description 10
- 238000005070 sampling Methods 0.000 abstract description 7
- 238000009434 installation Methods 0.000 abstract description 5
- 238000012545 processing Methods 0.000 abstract description 3
- 238000009529 body temperature measurement Methods 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012806 monitoring device Methods 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 utility model discloses a double-U-shaped thermal difference type flow detection probe, which comprises a mounting seat, wherein two U-shaped sensors are arranged at the bottom of the mounting seat, each U-shaped sensor comprises a U-shaped stainless steel protective sleeve, a PN junction semiconductor thermosensitive element is arranged in each stainless steel protective sleeve, and two ends of each PN junction semiconductor thermosensitive element respectively extend out of two ends of each stainless steel protective sleeve; the utility model discloses a double-U-shaped thermal difference type flow detection probe, which utilizes the temperature measurement characteristic of a PN junction of a semiconductor and measures the flow of fluid through a PN junction temperature sensitive element instead of a thermistor in the prior art; a self-heating mode of the sensing element is adopted, and the sensor does not need to be additionally heated, so that the processing and the installation are simple; the power consumption of the element is low, only 300mW is needed, and the service life is long; because the sampling probe is horizontally arranged in the U-shaped tube and basically fully immersed in a fluid medium, the contact area is maximized, so that a sampling signal is stable and sensitive, and the effective rate of the signal is at least more than 95%.
Description
Technical Field
The utility model belongs to the technical field of measuring instruments, and particularly relates to a double-U-shaped thermal difference type flow detection probe.
Background
The flow detection probe is a flow velocity sensing monitoring device, and has the main functions of detecting the flow velocity, sending an alarm signal when the flow velocity does not reach a set flow velocity threshold value, giving an alarm by a control system or starting a chain protection device to close key equipment, and timely stopping sudden accidents in production.
At present, the flow rate is measured by heat exchange between fluid and a heat source when the fluid flows. In the case of the immersion type measurement, a thermistor is placed in a pipe and self-heating with constant power is used to make the temperature of the thermistor higher than that of the fluid. Exposed in the fluid, the flow rate is proportional to the heat dissipation of the heat-sensitive element, while the potential value is changed. In the prior art, the following defects exist:
1. the single sensor is influenced by the temperature of the medium, and temperature drift can be generated to influence the measurement precision;
2. in order to overcome the influence of temperature drift, the circuit design is very complicated, the manufacturing difficulty is very high, and the structure size is large.
SUMMERY OF THE UTILITY MODEL
The utility model provides a double-U-shaped thermal difference type flow detection probe, which aims to solve the existing problems.
The utility model is realized in such a way that the double-U-shaped thermal difference type flow detection probe comprises a mounting seat, wherein two U-shaped sensors are arranged at the bottom of the mounting seat, each U-shaped sensor comprises a U-shaped stainless steel protective sleeve, a PN junction semiconductor thermosensitive element is arranged in each stainless steel protective sleeve, two ends of each PN junction semiconductor thermosensitive element respectively extend out of two ends of each stainless steel protective sleeve, and insulating fixing fillers are filled between each PN junction semiconductor thermosensitive element and each stainless steel protective sleeve.
Furthermore, the top of the mounting seat is provided with a connecting part, a cavity is formed in the mounting seat, and insulating fixed fillers are filled in the cavity.
Further, the insulating fixing filler is temperature-resistant insulating epoxy resin.
Furthermore, a mounting hole is formed in the bottom of the mounting base, and the end of the stainless steel protective sleeve is riveted and fixed with the mounting hole.
Furthermore, one of the U-shaped sensors is a reference sensor, and the other U-shaped sensor is a self-heating sensor.
Furthermore, the two U-shaped sensors are arranged at the bottom of the mounting seat at intervals in parallel.
Compared with the prior art, the utility model has the beneficial effects that: the utility model discloses a double-U-shaped thermal difference type flow detection probe, which utilizes the temperature measurement characteristic of a PN junction of a semiconductor and measures the flow of fluid through a PN junction temperature sensitive element instead of a thermistor in the prior art; a self-heating mode of the sensing element is adopted, and the sensor does not need to be additionally heated, so that the processing and the installation are simple; the power consumption of the element is low, only 300mW is needed, and the service life is long; because the sampling probe is horizontally arranged in the U-shaped pipe, the sampling probe is basically immersed in a fluid medium, the contact area is maximized, the sampling signal is stable and sensitive, and the effective rate of the signal is at least more than 95%; the structure is compact, the volume is small, and the installation and maintenance are convenient; meanwhile, the whole structure of the probe has no mechanical moving part, and the installation, the use and the maintenance are convenient; and a low-power-consumption temperature-sensitive sensor is adopted, so that the sensitivity is high, the precision is high, and the anti-interference capability is strong.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view of the present invention;
FIG. 3 is a schematic view of a U-shaped sensor according to the present invention;
in the figure: the sensor comprises a 1-PN junction semiconductor thermosensitive element, a 2-stainless steel protective sleeve, 3-insulating fixed filler, a 4-mounting seat and a 5-U-shaped sensor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 1-3, the present invention provides a technical solution: the utility model provides a two U type thermal difference type flow measurement probe, includes mount pad 4, and 4 bottoms of mount pad are provided with two U type sensors 5, and U type sensor 5 includes the stainless steel protective sheath 2 of U type, installs PN junction semiconductor thermistor 1 in the stainless steel protective sheath 2, and the both ends of PN junction semiconductor thermistor 1 are stretched out from stainless steel protective sheath 2 both ends respectively, and it has insulating fixed filler 3 to fill between PN junction semiconductor thermistor 1 and the stainless steel protective sheath 2.
Specifically, the temperature-sensitive sensor disclosed by the utility model is manufactured by using a special semiconductor, specifically a PN junction semiconductor thermosensitive element 1. The two sensors are physically very close and separated from each other by a distance, and have negligible thermal influence on each other. The sensor pair tracks the temperature of the media. The voltage drop of these sensors is proportional to temperature and operates over a wide temperature range with accuracy.
In this embodiment, 4 tops of mount pad are provided with connecting portion, seted up the cavity in the mount pad 4, the cavity intussuseption is filled with insulating fixed filler 3, insulating fixed filler 3 is the insulating epoxy of temperature resistant, the mounting hole has been seted up to 4 bottoms of mount pad, 2 tip and mounting hole riveting fixed of stainless steel protective sheath, one of them U type sensor 5 is the benchmark sensor, another U type sensor 5 is self-heating sensor, two parallel intervals of U type sensor 5 set up in 4 bottoms of mount pad.
One sensor is heated to be higher than the temperature of the medium and is a self-heating sensor, the other sensor has the same temperature with the medium, and the sensor with the same temperature with the medium is a reference sensor. An equal constant current flowing through the two sensors creates a voltage difference whose magnitude is inversely proportional to how much heat is absorbed away by the medium on the self-heating sensor. Since the flow velocity of the medium is proportional to the quantity of heat to be taken away, the current flow velocity of the medium can be known by measuring the voltage difference between the two sensors, and the flow rate of the medium can be known by calculation.
The two sensors are riveted on the mounting base according to a certain distance, the mounting base 4 is filled with temperature-resistant insulating epoxy resin to fix the sensors, and meanwhile, temperature-sensitive elements in the sensors are completely insulated and isolated from media and the environment.
When the device is used specifically, two sensors of the probe are placed in a flowing medium at the same time, one of the two sensors is heated by a self-heating mode to enable the temperature of the other sensor to be higher than that of the medium, and the temperature sensing information of the sensors is output; and the other one is the same as the medium temperature, and medium temperature information is output. The double sensors form a thermal temperature difference, and the sensors are self-heaters and temperature-sensing information samplers at the same time.
The utility model adopts a self-heating mode of the sensing element, and does not need to additionally heat the sensor, so that the processing and the installation are simple; the power consumption of the element is low, only 300mW is needed, and the service life is long; because the sampling probe is horizontally arranged in the U-shaped tube and basically fully immersed in a fluid medium, the contact area is maximized, so that a sampling signal is stable and sensitive, and the effective rate of the signal is at least more than 95%.
The probe is placed in the measured fluid, and the flow rate control point required to be controlled can be adjusted and set. When the medium flow reaches the control point, the state of the output switch signal is inverted, so that the downstream unit element or equipment is controlled to be switched on or switched off.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The utility model provides a two U type heat differential flow measurement probe which characterized in that: the mounting structure comprises a mounting base, the mounting base bottom is provided with two U type sensors, U type sensor includes the stainless steel protective sheath of U type, install PN junction semiconductor temperature sensing element in the stainless steel protective sheath, PN junction semiconductor temperature sensing element's both ends are followed respectively stainless steel protective sheath both ends are stretched out, just PN junction semiconductor temperature sensing element with it has insulating fixed filler to fill between the stainless steel protective sheath.
2. The double U-shaped thermal differential flow detection probe of claim 1, wherein: the mounting base top is provided with connecting portion, has seted up the cavity in the mounting base, the cavity intussuseption is filled with insulating fixed filler.
3. The double U-shaped thermal differential flow detection probe of claim 2, wherein: the insulating fixing filler is temperature-resistant insulating epoxy resin.
4. The double U-shaped thermal differential flow detection probe of claim 1, wherein: the mounting base is provided with a mounting hole at the bottom, and the end part of the stainless steel protective sleeve is riveted and fixed with the mounting hole.
5. The double U-shaped thermal differential flow detection probe of claim 1, wherein: one of the U-shaped sensors is a reference sensor, and the other U-shaped sensor is a self-heating sensor.
6. The double U-shaped thermal differential flow detection probe of claim 1, wherein: the two U-shaped sensors are arranged at the bottom of the mounting seat at intervals in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122193660.4U CN216050088U (en) | 2021-09-11 | 2021-09-11 | double-U-shaped thermal difference type flow detection probe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122193660.4U CN216050088U (en) | 2021-09-11 | 2021-09-11 | double-U-shaped thermal difference type flow detection probe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216050088U true CN216050088U (en) | 2022-03-15 |
Family
ID=80598139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122193660.4U Active CN216050088U (en) | 2021-09-11 | 2021-09-11 | double-U-shaped thermal difference type flow detection probe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216050088U (en) |
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2021
- 2021-09-11 CN CN202122193660.4U patent/CN216050088U/en active Active
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