CN209148055U - A kind of temperature control heat tracing Pitot tube - Google Patents
A kind of temperature control heat tracing Pitot tube Download PDFInfo
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- CN209148055U CN209148055U CN201920075163.4U CN201920075163U CN209148055U CN 209148055 U CN209148055 U CN 209148055U CN 201920075163 U CN201920075163 U CN 201920075163U CN 209148055 U CN209148055 U CN 209148055U
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- 239000000523 sample Substances 0.000 claims abstract description 36
- 238000012544 monitoring process Methods 0.000 claims abstract description 28
- 238000010926 purge Methods 0.000 claims abstract description 21
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- 238000009413 insulation Methods 0.000 claims abstract description 11
- 230000001681 protective effect Effects 0.000 claims description 7
- 239000010445 mica Substances 0.000 claims description 5
- 229910052618 mica group Inorganic materials 0.000 claims description 5
- 229920000742 Cotton Polymers 0.000 claims description 3
- 229920005830 Polyurethane Foam Polymers 0.000 claims description 3
- 239000010425 asbestos Substances 0.000 claims description 3
- 239000011490 mineral wool Substances 0.000 claims description 3
- 229920001721 polyimide Polymers 0.000 claims description 3
- 239000011496 polyurethane foam Substances 0.000 claims description 3
- 229910052895 riebeckite Inorganic materials 0.000 claims description 3
- 229920002379 silicone rubber Polymers 0.000 claims description 3
- 239000004945 silicone rubber Substances 0.000 claims description 2
- 239000010408 film Substances 0.000 claims 3
- 239000004642 Polyimide Substances 0.000 claims 1
- 239000011152 fibreglass Substances 0.000 claims 1
- 239000010409 thin film Substances 0.000 claims 1
- 239000007789 gas Substances 0.000 abstract description 18
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 12
- 239000003546 flue gas Substances 0.000 abstract description 12
- 238000005259 measurement Methods 0.000 abstract description 11
- 238000012360 testing method Methods 0.000 abstract description 9
- 238000009833 condensation Methods 0.000 abstract description 5
- 230000005494 condensation Effects 0.000 abstract description 5
- 239000007787 solid Substances 0.000 abstract description 4
- 239000012535 impurity Substances 0.000 abstract description 3
- 238000005530 etching Methods 0.000 abstract 1
- 238000007689 inspection Methods 0.000 abstract 1
- 239000013618 particulate matter Substances 0.000 abstract 1
- 230000003068 static effect Effects 0.000 description 11
- 230000008859 change Effects 0.000 description 7
- 238000005260 corrosion Methods 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 6
- 239000012530 fluid Substances 0.000 description 4
- 239000000779 smoke Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- LSIXBBPOJBJQHN-UHFFFAOYSA-N 2,3-Dimethylbicyclo[2.2.1]hept-2-ene Chemical compound C1CC2C(C)=C(C)C1C2 LSIXBBPOJBJQHN-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Examining Or Testing Airtightness (AREA)
Abstract
A kind of temperature control heat tracing Pitot tube, belongs to flue gas inspection equipment technical field.Heating film and insulating layer are successively enclosed with outside the total pressure test tube and back pressure test tube of the temperature control heat tracing Pitot tube respectively, thermal insulation layer is enclosed with outside the insulating layer of total pressure test tube and back pressure test tube jointly, the outside of thermal insulation layer is equipped with protection outer housing, the side wall that at least one temp probe passes through protection outer housing protrudes into thermal insulation layer, the measurement end of temp probe is close to the position that the insulating layer of total pressure test tube and back pressure test tube contacts with each other, the one end of total pressure connector far from total pressure test tube, the one end of one end and temp probe far from its measurement end of back pressure connector far from back pressure test tube is connect with online monitoring instruments.The temperature control heat tracing Pitot tube, temperature in Pitot tube can be maintained 80 DEG C or more, solve Pitot tube etching problem caused by due to condensation, online monitoring instruments have the function of purging, the solid particulate matter impurity in discharge gas can be effectively removed, the blockage problem of Pitot tube is efficiently solved.
Description
Technical Field
The utility model relates to a flue gas check out test set technical field, in particular to control by temperature change companion's heat pitot tube.
Background
In smoke detection work, a pitot tube is one of the most common sampling devices in detection sampling equipment. During measurement, a probe of the pitot tube flow meter is inserted into a pipeline, the central axes of a full-pressure probe and a back-pressure probe are positioned in the center of an overflowing section and are consistent with the direction of a streamline, the front side of a measuring hole of the full-pressure probe is in correspondence with incoming flow, the total pressure of fluid is detected, and the total pressure of the fluid is transmitted to a monitoring system; and simultaneously, the throttling static pressure picked up by the measuring hole of the back pressure probe is also transmitted to the monitoring system, the monitoring system reads the total and static pressure values, the difference value between the dynamic pressure and the static pressure is solved, and the flow rate value is calculated by applying a formula.
However, the flue gas contains various gas components, such as water vapor, sulfur dioxide, nitrogen oxides, and the like, which not only corrode the pitot tube, but also cause blockage of the pitot tube due to condensation of the gas at a low temperature, thereby affecting the accuracy of detection. Therefore, the problems of corrosion and blockage of the pitot tube are two major problems to be solved urgently in flow rate measurement. At present, the common pitot tube for measuring flow velocity generally adopts a mode of stainless steel materials and stainless steel sheaths to solve the problems of corrosion and abrasion, but no better solution is provided for the problem of blockage.
Disclosure of Invention
In order to solve the problem that prior art exists, the utility model aims at providing a control by temperature change companion heat pitot tube can maintain the temperature in the pitot tube more than 80 ℃, has solved the pitot tube corrosion problem that causes because of the condensation, and the on-line monitoring instrument has the function of sweeping, can effectively clear away the solid particle thing impurity among the exhaust gas, has effectively solved the jam problem of pitot tube.
In order to realize the purpose, the technical scheme of the utility model is that:
a temperature control heat tracing pitot tube comprises a full pressure measuring tube and a back pressure measuring tube, wherein one end of the full pressure measuring tube is connected with a full pressure joint, the other end of the full pressure measuring tube is provided with a full pressure measuring hole, one end of the backpressure measuring pipe is connected with the backpressure joint, the other end of the backpressure measuring pipe is provided with a backpressure measuring hole, the full-pressure measuring tube and the back pressure measuring tube are respectively wrapped with a heating film and an insulating layer, the insulating layers of the full-pressure measuring tube and the back pressure measuring tube are wrapped with a heat insulating layer, a protective shell is arranged outside the heat insulation layer, at least one temperature probe penetrates through the side wall of the protective shell and extends into the heat insulation layer, the measuring end of the temperature probe is close to the mutual contact part of the insulating layers of the full pressure measuring tube and the back pressure measuring tube, and one end of the full-pressure joint far away from the full-pressure measuring pipe, one end of the back-pressure joint far away from the back-pressure measuring pipe and one end of the temperature probe far away from the measuring end of the back-pressure measuring pipe are connected with an online monitoring instrument.
The online monitoring instrument is characterized in that a temperature display, a pressure display, a full-pressure interface, a backpressure interface, a temperature probe interface and a purging gas source interface are arranged outside the online monitoring instrument, a first differential pressure transmitter, a second differential pressure transmitter, a first timer, a second timer, a third timer, a fourth timer, a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve and a fourth electromagnetic valve are arranged inside the online monitoring instrument, one end of the temperature probe far away from the measuring end of the temperature probe is connected with the temperature probe interface, the temperature probe interface is connected with the temperature display, one end of the full-pressure connector far away from the full-pressure measuring pipe is connected with the full-pressure interface, the full-pressure interface is connected with the input end of the first differential pressure transmitter through a third pipeline, a third electromagnetic valve and a third timer are arranged on the third pipeline, one end of the backpressure connector far away from the backpressure measuring pipe is connected with the backpressure interface, the fourth pipeline is provided with a fourth electromagnetic valve and a fourth timer, the output end of the first differential pressure transmitter and the output end of the second differential pressure transmitter are both connected with the pressure display, one end of the purging gas source interface is connected with an external gas source, the other end of the purging gas source interface is communicated with the third pipeline through the first pipeline and communicated with the fourth pipeline through the second pipeline, the first pipeline is provided with the first electromagnetic valve and the first timer, and the second pipeline is provided with the second electromagnetic valve and the second timer.
The third electromagnetic valve and the third timer are both positioned between the connection position of the first pipeline and the third pipeline and the first differential pressure transmitter, and the fourth electromagnetic valve and the fourth timer are both positioned between the connection position of the second pipeline and the fourth pipeline and the second differential pressure transmitter.
The heating film is a polyimide film PI electric heating film.
The insulating layer is made of silicon rubber, asbestos or mica plate.
The heat insulation layer is made of glass fiber cotton felt, polyurethane foam material or rock wool.
The utility model has the advantages that:
(1) the temperature control heat tracing pitot tube heats the full-pressure measuring tube and the back pressure measuring tube by utilizing the heating film, so that the smoke is ensured not to be in a condensation state, the corrosion and the blockage of the full-pressure measuring tube and the back pressure measuring tube are prevented, and the flow measurement is more accurate;
(2) the temperature probe is positioned at the part where the insulating layers close to the full-pressure measuring tube and the backpressure measuring tube are contacted with each other, the temperature of the full-pressure measuring tube and the temperature of the backpressure measuring tube can be monitored simultaneously, so that the heating switch of the heating film can be controlled according to the set temperature, the heating of the heating film is stopped when the temperature is too high, the heating switch of the heating film is started when the temperature is lower, in addition, the flue gas is used as a special medium, the temperature range is about 40-120 ℃, the higher temperature can be reached under special conditions, and in order to prevent the flue gas from condensing in a low-temperature state, the utility model discloses can maintain the temperature in the pitot tube at more than 80 ℃, and solve the problem of pitot tube corrosion;
(3) the online monitoring instrument can detect dynamic pressure, static pressure and temperature in the pipeline and can monitor the temperature in real time, so that the flow velocity measurement is more accurate;
(4) the online monitoring instrument has a purging function, can effectively remove impurities such as solid particles contained in the exhaust gas, further ensures that the pitot tube is not blocked, can effectively solve the problem of blockage of the pitot tube, increases the stability of measurement and reduces the overhaul work of operation and maintenance personnel;
(5) the utility model discloses a control by temperature change companion's heat pitot tube can wide application in all kinds of environmental protection and clean room, mine ventilation and energy management departments, can carry out on-line monitoring to the gas velocity of flow, temperature, the pressure of various boilers, stove flue and mine exhaust pipe.
Drawings
FIG. 1 is a schematic structural view of a temperature-controlled heat-tracing pitot tube provided by the present invention;
fig. 2 is an enlarged view of B in fig. 1 provided by the present invention;
fig. 3 is a sectional view taken along a-a of fig. 1 according to the present invention;
FIG. 4 is a schematic view of the installation of a temperature controlled heat tracing pitot tube provided by the present invention;
fig. 5 is a schematic structural diagram of the on-line monitoring instrument provided by the present invention.
Wherein,
1. a full pressure joint; 2. a back pressure joint; 3. a full pressure measuring tube; 4. a back pressure measuring tube; 5. a temperature probe; 6. a protective outer shell; 7. full pressure measurement; 8. back pressure hole measurement; 9. the flow direction of the flue gas; 10. heating the film; 11. an insulating layer; 12. a thermal insulation layer; 14. a full pressure interface; 15. a backpressure interface; 16. a purge gas source interface; 17. a temperature display; 18-1, a first differential pressure transmitter; 18-2, a second differential pressure transmitter; 19-1, a first timer; 19-2, a second timer; 19-3, a third timer; 19-4, a timer IV; 20. a first electromagnetic valve; 21. a second electromagnetic valve; 22. a third electromagnetic valve; 23. a fourth electromagnetic valve; 24. a pressure display; 25. a temperature probe interface.
Detailed Description
The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention. In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, and for example, "connected" may be either fixedly connected or detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. In the description of the present invention, it should be noted that the terms "one end", "the other end" and the like indicate the orientation or the positional relationship based on the orientation or the positional relationship shown in the drawings, which are only for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "a," "an," "two," "three," and "four" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In order to solve the problems of the prior art, as shown in fig. 1 to 5, the present invention provides a temperature control heat tracing pitot tube, which comprises a full pressure measuring tube 3 and a back pressure measuring tube 4, wherein one end of the full pressure measuring tube 3 is connected to a full pressure joint 1, the other end of the full pressure measuring tube 3 is provided with a full pressure measuring hole 7, one end of the back pressure measuring tube 4 is connected to a back pressure joint 2, the other end of the back pressure measuring tube 4 is provided with a back pressure measuring hole 8, the full pressure measuring tube 3 and the back pressure measuring tube 4 are respectively and sequentially wrapped with a heating film 10 and an insulating layer 11, the insulating layers 11 of the full pressure measuring tube 3 and the back pressure measuring tube 4 are commonly wrapped with a thermal insulating layer 12, the exterior of the thermal layer 12 is provided with a protective casing 6, at least one temperature probe 5 penetrates through the side wall of the protective casing 6 and extends into the thermal layer 12, in this embodiment, one temperature probe 5 is adopted, the measuring end of the temperature probe 5 is close to the mutually contacting part of the insulating, one end of the full-pressure joint 1, which is far away from the full-pressure measuring pipe 3, one end of the back pressure joint 2, which is far away from the back pressure measuring pipe 4, and one end of the temperature probe 5, which is far away from the measuring end are all connected with an online monitoring instrument.
The outside of the on-line monitoring instrument is provided with a temperature display 17, a pressure display 24, a full pressure interface 14, a backpressure interface 15, a temperature probe interface 25 and a purging gas source interface 16, the inside of the on-line monitoring instrument is provided with a differential pressure transmitter I18-1, a differential pressure transmitter II 18-2, a timer I19-1, a timer II 19-2, a timer III 19-3, a timer IV 19-4, a solenoid valve I20, a solenoid valve II 21, a solenoid valve III 22 and a solenoid valve IV 23, one end of the temperature probe 5 far away from the measuring end is connected with the temperature probe interface 25, the temperature probe interface 25 is connected with the temperature display 17, one end of the full pressure connector 1 far away from the full pressure measuring pipe 3 is connected with the full pressure interface 14, the full pressure interface 14 is connected with the input end of the differential pressure transmitter I18-1 through a pipeline III, the pipeline III is provided with the solenoid valve III 22 and the timer III 19, one end, far away from the back pressure measuring pipe 4, of the back pressure connector 2 is connected with a back pressure interface 15, the back pressure interface 15 is connected with an input end of a second differential pressure transmitter 18-2 through a fourth pipeline, a fourth electromagnetic valve 23 and a fourth timer 19-4 are arranged on the fourth pipeline, an output end of the first differential pressure transmitter 18-1 and an output end of the second differential pressure transmitter 18-2 are both connected with a pressure display 24, one end of a purge gas source interface 16 is connected with an external gas source, the other end of the purge gas source interface 16 is communicated with a third pipeline through a first pipeline, the other end of the purge gas source interface 16 is also communicated with the fourth pipeline through a second pipeline, a first electromagnetic valve 20 and a first timer 19-1 are arranged on the first pipeline, and a second electromagnetic valve 21 and a. And a solenoid valve three 22 and a timer three 19-3 are positioned between the connection part of the pipeline one and the pipeline three and the differential pressure transmitter one 18-1, and a solenoid valve four 23 and a timer four 19-4 are positioned between the connection part of the pipeline two and the pipeline four and the differential pressure transmitter two 18-2.
The heating film 10 is a polyimide film PI electric heating film. The insulating layer 11 is made of silicone rubber, asbestos or mica plate, in this embodiment, the mica plate is made of soft mica plate. The heat insulation layer 12 is made of glass fiber cotton felt, polyurethane foam material or rock wool.
In this embodiment, the on-line monitoring instrument has temperature monitoring, pressure monitoring and sweeps three functions, can the temperature of real-time supervision control by temperature change heat tracing pitot tube, and the solid particle thing in full pressure survey pipe 3 and the back pressure survey pipe 4 can be clear away to the pressure in full pressure survey hole 7 and the back pressure survey hole 8 on indefinite period. The external air source is compressed air, the purging frequency of the purging full-pressure measuring pipe 3 is controlled by the first metering electromagnetic valve 20 and the first timer 19-1, and the purging frequency of the purging back-pressure measuring pipe 4 is controlled by the second electromagnetic valve 21 and the second timer 19-2. In this embodiment, the temperature display 17 is HD-730 of SUHED, the differential pressure transmitter I18-1 and the differential pressure transmitter II 18-2 are both MIK-6000 of Sopomet, the pressure display is XMT of Ouwei, the temperature probe 5 is MF-53-103-F-3950 of Xinglong, and the timers I19-1, II 19-2, III 19-3 and IV 19-4 are all H7ET-BLM of SANTEN.
The utility model discloses in, it is the prerequisite that the control by temperature change heat tracing pitot tube is reliable, the effective operation to select the correct mounted position, control by temperature change heat tracing pitot tube installation quality has great influence to its measurement accuracy, because control by temperature change heat tracing pitot tube carries out work according to the steady flow fluid theory that is full of the pipe, therefore should keep away from fan, valve, elbow etc. easily cause the position of flow state fluctuation when selecting the measuring point, and the measuring point upper reaches should have 3D ~ 5D straight tube section, in order to guarantee that measuring point department overflow section velocity distribution law meets the requirements, in addition, need to pay attention to following several points, ① mounted position should avoid flue elbow and the position that the section sharply changes, ② mounted position should avoid corroding and harmful gas's position, ③ mounting point should easily arrive, help the security of installation and maintenance passageway, ④ arrangement of signal line should keep away from other electromagnetic equipment, avoid mutual interference.
The working principle of the temperature-control heat tracing pitot tube is as follows:
as shown in fig. 4, during measurement, a temperature control heat tracing pitot tube is inserted into a pipeline, the central axes of a full pressure measuring hole 7 and a back pressure measuring hole 8 are positioned in the center of an overflowing section and are consistent with the flow direction 9 of flue gas, the front of the full pressure measuring hole 7 corresponds to incoming flow, the full pressure of fluid is detected, the full pressure is connected with a full pressure interface 14 of an online monitoring instrument through a full pressure joint 1, the full pressure is transmitted to a differential pressure transmitter I18-1, and the full pressure value measured by the differential pressure transmitter I18-1 is displayed on a pressure display 24; and meanwhile, the back pressure measuring hole 8 is back to the incoming flow, the throttling static pressure is picked up and is connected with a back pressure interface 15 of the online monitoring instrument through a back pressure joint 2, the static pressure is transmitted to a second differential pressure transmitter 18-2, and the static pressure value measured by the second differential pressure transmitter 18-2 is displayed on a pressure display 24. During actual work, a dynamic pressure value is obtained according to the full pressure value and the static pressure value, the dynamic pressure value is the difference value of the full pressure value and the static pressure value, the dynamic pressure value is related to the flow velocity of the flue gas, the dynamic pressure value is large when the flow velocity is large, and the dynamic pressure value is zero when the flow velocity is not large, so that the flow velocity value is calculated according to a Bernoulli equation and through dynamic pressure, a flue gas constant, the flue gas temperature, a pitot tube correction coefficient and the like.
As shown in fig. 5, the solid lines represent gas paths for the line connections and the dashed lines represent lines for the wire connections. The on-line monitoring instrument can measure the temperature of the mutual contact part of the insulating layers 11 of the full-pressure measuring tube 3 and the back-pressure measuring tube 4 besides measuring the full pressure and the static pressure of the smoke, the temperature probe 5 picks up a temperature value which is displayed on the temperature display 17, an operator controls the switch of the heating film 10 by contrasting the set temperature according to the temperature displayed by the temperature display 17, in the embodiment, the temperature displayed by the display is higher than or equal to 80 ℃, the heating switch of the heating film 10 is closed, the temperature displayed by the display is lower than 80 ℃, the heating switch of the heating film 10 is opened to prevent the smoke from being condensed in a low-temperature state, and the technical problem of pitot tube corrosion caused by condensation is solved. In addition, purging is required occasionally during the measurement to clean the temperature controlled heat trace pitot tube.
The utility model discloses an on-line monitoring instrument mode of operation has two kinds:
the first mode of operation: the temperature control heat tracing pitot tube is in a working state, the electromagnetic valve III 22 and the electromagnetic valve IV 23 are opened, the electromagnetic valve I20 and the electromagnetic valve II 21 are closed, the flue gas sequentially passes through the full-pressure measuring hole 7, the full-pressure measuring tube 3, the full-pressure joint 1, the full-pressure interface 14, the electromagnetic valve III 22 and the differential pressure transmitter I18-1, the full-pressure value is displayed on the pressure display 24, meanwhile, the flue gas sequentially passes through the backpressure measuring hole 8, the backpressure measuring tube 4, the backpressure joint 2, the backpressure interface 15, the electromagnetic valve IV 23 and the differential pressure transmitter II 18-2, and the static pressure value is displayed on the pressure display 24;
the second working mode is as follows: when the temperature control heat tracing pitot tube is cleaned, the electromagnetic valve III and the electromagnetic valve IV 23 are closed, the electromagnetic valve I20 and the electromagnetic valve II 21 are opened, compressed air passes through the purging air source interface 16, a part of compressed air sequentially passes through the electromagnetic valve I20, the full-pressure interface 14 and the full-pressure connector 1 to clean the full-pressure measuring tube 3, and meanwhile, the other part of compressed air sequentially passes through the electromagnetic valve II 21, the backpressure interface 15 and the backpressure connector 2 to clean the backpressure measuring tube 4.
When the online monitoring instrument works, the timer I19-1 is used for controlling the opening and closing of the electromagnetic valve I20 to control the purging frequency of the full-pressure measuring pipe 3, and the timer II 19-2 is used for controlling the opening and closing of the electromagnetic valve II 21 to control the purging frequency of the back-pressure measuring pipe 4. The third timer 19-3 is used for controlling the opening and closing of the third electromagnetic valve 22 and the fourth timer 19-4 is used for controlling the opening and closing of the fourth electromagnetic valve 23, and when the first electromagnetic valve 20 and the second electromagnetic valve 21 are in a closed state, the third electromagnetic valve 22 and the fourth electromagnetic valve 23 are opened; conversely, when the first solenoid valve 20 and the second solenoid valve 21 are in the open state, the third solenoid valve 22 and the fourth solenoid valve 23 are closed.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (6)
1. A temperature control heat tracing pitot tube comprises a full pressure measuring tube and a back pressure measuring tube, wherein one end of the full pressure measuring tube is connected with a full pressure joint, the other end of the full pressure measuring tube is provided with a full pressure measuring hole, one end of the backpressure measuring pipe is connected with the backpressure joint, the other end of the backpressure measuring pipe is provided with a backpressure measuring hole, it is characterized in that the full-pressure measuring tube and the back pressure measuring tube are respectively wrapped with a heating film and an insulating layer in turn, the insulating layers of the full-pressure measuring tube and the back pressure measuring tube are wrapped with a heat insulating layer, a protective shell is arranged outside the heat insulation layer, at least one temperature probe penetrates through the side wall of the protective shell and extends into the heat insulation layer, the measuring end of the temperature probe is close to the mutual contact part of the insulating layers of the full pressure measuring tube and the back pressure measuring tube, and one end of the full-pressure joint far away from the full-pressure measuring pipe, one end of the back-pressure joint far away from the back-pressure measuring pipe and one end of the temperature probe far away from the measuring end of the back-pressure measuring pipe are connected with an online monitoring instrument.
2. The temperature-controlled heat tracing pitot tube according to claim 1, wherein a temperature display, a pressure display, a full pressure interface, a back pressure interface, a temperature probe interface and a purging gas source interface are arranged outside the on-line monitoring instrument, a first differential pressure transmitter, a second differential pressure transmitter, a first timer, a second timer, a third timer, a fourth timer, a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve and a fourth electromagnetic valve are arranged inside the on-line monitoring instrument, one end of the temperature probe far away from the measuring end is connected with the temperature probe interface, the temperature probe interface is connected with the temperature display, one end of the full pressure joint far away from the full pressure measuring tube is connected with the full pressure interface, the full pressure interface is connected with the input end of the first differential pressure transmitter through a third pipeline, a third electromagnetic valve and a third timer are arranged on the third pipeline, one end of the back pressure joint far away from the back pressure measuring tube is connected with the back, the back pressure interface is connected with the input end of the second differential pressure transmitter through the fourth pipeline, the fourth pipeline is provided with a fourth electromagnetic valve and a fourth timer, the output end of the first differential pressure transmitter and the output end of the second differential pressure transmitter are both connected with the pressure display, one end of the purging gas source interface is connected with an external gas source, the other end of the purging gas source interface is simultaneously communicated with the third pipeline through the first pipeline, and is communicated with the fourth pipeline through the second pipeline, the first pipeline is provided with a first electromagnetic valve and a first timer, and the second pipeline is provided with a second electromagnetic valve and a second timer.
3. The temperature controlled heat tracing pitot tube of claim 2, wherein the third solenoid valve and the third timer are both located between the first differential pressure transmitter and the junction of the first pipeline and the third pipeline, and the fourth solenoid valve and the fourth timer are both located between the second differential pressure transmitter and the junction of the second pipeline and the fourth pipeline.
4. The temperature controlled heat tracing pitot tube of claim 1, wherein the heating film is a polyimide thin film PI electrothermal film.
5. The temperature controlled heat tracing pitot tube of claim 1, wherein the insulating layer is silicone rubber, asbestos, or mica board.
6. The temperature-controlled heat tracing pitot tube of claim 1, wherein the thermal insulation layer is fiberglass cotton felt, polyurethane foam or rock wool.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920075163.4U CN209148055U (en) | 2019-01-17 | 2019-01-17 | A kind of temperature control heat tracing Pitot tube |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920075163.4U CN209148055U (en) | 2019-01-17 | 2019-01-17 | A kind of temperature control heat tracing Pitot tube |
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| Publication Number | Publication Date |
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| CN209148055U true CN209148055U (en) | 2019-07-23 |
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| CN201920075163.4U Active CN209148055U (en) | 2019-01-17 | 2019-01-17 | A kind of temperature control heat tracing Pitot tube |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109489744A (en) * | 2019-01-17 | 2019-03-19 | 临沂大学 | A kind of temperature control heat tracing Pitot tube |
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2019
- 2019-01-17 CN CN201920075163.4U patent/CN209148055U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109489744A (en) * | 2019-01-17 | 2019-03-19 | 临沂大学 | A kind of temperature control heat tracing Pitot tube |
| CN109489744B (en) * | 2019-01-17 | 2024-10-01 | 临沂大学 | Temperature control heat tracing pitot tube |
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