CN210486985U

CN210486985U - Automatic control heat preservation and freeze prevention device for heat supply network steam flow meter

Info

Publication number: CN210486985U
Application number: CN201921802855.0U
Authority: CN
Inventors: 陈杰; 翁郑龙
Original assignee: Zhejiang Xinzhonggang Clean Energy Co Ltd
Current assignee: Zhejiang xinzhonggang Thermal Power Co.,Ltd.
Priority date: 2019-10-24
Filing date: 2019-10-24
Publication date: 2020-05-08
Anticipated expiration: 2029-10-24

Abstract

The utility model relates to a flowmeter technical field that prevents frostbite discloses a heat supply network steam flowmeter automatic control heat preservation freeze-proof device, including digital temperature controller, temperature sensor, heat tracing band, heat preservation pipe box and be used for being fixed in the heat tracing band with the heat tracing band and lead the mounting in the fixed heat tracing band on the pressure pipe outer wall, the heat tracing band extends along pressure pipe length direction, outside the mounting was located to the heat preservation pipe box, temperature sensor set up on leading the pressure pipe outer wall, temperature sensor is connected with digital temperature controller electricity and transmits the temperature signal of surveying for digital temperature appearance, thereby digital temperature appearance and heat tracing band electricity are connected according to the heating power in this temperature signal of telecommunication control heat tracing band after receiving the temperature signal of telecommunication. The utility model discloses thereby utilize temperature sensor to detect the connecting pipe temperature and utilize digital temperature controller to generate heat according to the temperature control companion torrid zone and heat when low temperature to the connecting pipe heating in order to avoid the condensate water to freeze to guarantee that steam flowmeter normally works.

Description

Automatic control heat preservation and freeze prevention device for heat supply network steam flow meter

Technical Field

The utility model belongs to the technical field of the flowmeter prevents frostbite, in particular to heat supply network steam flow meter automatic control heat preservation freeze-proof device.

Background

The differential pressure type flowmeter is based on the throttling principle of fluid flow, and realizes flow measurement by utilizing the pressure difference generated when fluid flows through a throttling device. It is one of the most mature and commonly used methods for measuring flow in the current production. It is generally composed of a throttle device which can convert the measured flow into differential pressure signal, a differential pressure meter which can convert the differential pressure into corresponding flow value and display the value, and a display instrument. In the case of a cell cluster, the differential pressure signal generated by the throttle device is often converted by a differential pressure transmitter into a corresponding standard signal (electrical or pneumatic) for display, recording or control purposes.

The electric power plant measures the flow rate of steam in a steam pipeline by using a differential pressure type flow meter, and the flow meter is conventionally called as a differential pressure type steam flow meter. As shown in fig. 1, the conventional differential pressure type steam flowmeter includes a throttle pipe 11, two pressure guide pipes 12, a differential pressure transmitter 13 and a display 14, wherein the throttle pipe 11 is installed in the middle of a steam pipeline 15, the two pressure guide pipes 12 are respectively connected to two ends of the throttle pipe 11, the other ends of the two pressure guide pipes 12 are both connected to the differential pressure transmitter 13, and the differential pressure transmitter 13 is electrically connected to the display 14.

When the external environment is in an extremely cold weather condition, the condensed water in the pressure guide pipe is frozen due to too low temperature when being transmitted to the differential pressure transmitter through the instrument pipe, so that signals such as pressure, flow and the like cannot be accurately transmitted to a sensing part of the differential pressure transmitter, the pressure or flow signals cannot be displayed or seriously distorted, the steam pressure and flow signals of a heat supply network are misaligned, operators cannot accurately control the parameters of the steam, and danger is easy to occur.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims to provide a heat supply network steam flow meter automatic control heat preservation freeze-proof device utilizes the companion torrid zone to generate heat thereby when avoiding low temperature condensate water in the connecting pipe takes place the phenomenon of freezing, guarantees steam flow meter normal work for the parameter that the operation personnel can accurate control steam, thereby avoids danger.

The above technical purpose of the present invention can be achieved by the following technical solutions: a self-control heat preservation and anti-freezing device of a heat supply network steam flowmeter comprises a digital temperature controller, a temperature sensor, a heat tracing band, a heat preservation pipe sleeve and a fixing piece for fixing the heat tracing band on the outer wall of a pressure guide pipe, wherein the heat tracing band extends along the length direction of the pressure guide pipe, the heat preservation pipe sleeve is arranged outside the fixing piece, the temperature sensor is arranged on the outer wall of the pressure guide pipe, the temperature sensor is electrically connected with the digital temperature controller to transmit a measured temperature electric signal to the digital temperature meter, and the digital temperature meter is electrically connected with the heat tracing band so as to control the heating power of the heat tracing band according to the temperature electric signal after receiving the temperature electric signal.

By adopting the technical scheme, the heat tracing band is fixed on the outer wall of the pressure guide pipe by the fixing piece, the heat tracing band heats under the control of the digital temperature controller, the generated heat is transferred to the pressure guide pipe, so that condensed water is not easy to freeze, and the anti-freezing effect is realized; the heat tracing band is used for heating to prevent the condensed water in the pressure guide pipe from freezing, so that the steam flow meter can accurately measure the steam flow.

Further setting the following steps: the heat tracing band is spirally distributed around the pressure guide pipe.

Through adopting above-mentioned technical scheme, can twine longer companion's tropical on the connecting pipe of same length pair, and the distribution of heliciform can make the connecting pipe outer wall be heated more evenly.

Further setting the following steps: the spiral pitches of the heat tracing band at the two ends of the pressure guide pipe are smaller than the spiral pitch in the middle.

By adopting the technical scheme, the heat at the two ends of the pressure guide pipe is easily dissipated to the steam pipeline, the throttle pipe and the differential pressure transmitter, the two ends of the middle part are heated by the heat tracing belt, the screw pitches at the two ends are smaller than the screw pitch in the middle, so that the actual length of the heat tracing belt on the outer walls at the two ends of the pressure guide pipe is larger than the middle position in the same outer wall surface area, and the two ends and the middle part of the heating effect are more uniform; meanwhile, the temperature measured by the temperature sensor can reflect the average value on the outer wall of the pressure guide pipe better.

Further setting the following steps: the heat tracing band is an anti-flaming and anti-explosion heat tracing band, the heat tracing band comprises a core wire, conductive plastic and a flame-retardant layer, the conductive plastic is flatly wrapped outside the core, the flame-retardant layer is wrapped outside the conductive plastic, and the flame-retardant layer is provided with a heat insulation layer on the surfaces except the surface in contact with the outer wall of the pressure pipe.

Through adopting above-mentioned technical scheme, the insulating layer prevents that the heat that the companion torrid zone produced from to keeping away from the direction transmission of pressure pipe outer wall, and the heat is more transfers between the surface of fire-retardant layer and the contact of pressure pipe outer wall and pressure pipe outer wall, and the heat is difficult for scattering and disappearing, and the utilization efficiency is higher.

Further setting the following steps: the insulating layer is thermal-insulated plastic cover, thermal-insulated plastic cover's cross-section is the font of cutting graftage, and the opening is towards the pressure pipe direction, has seted up a plurality of heat conduction grooves along thermal-insulated plastic cover length direction distribution on the open-ended inner wall, and the heat conduction groove is seted up and is set up in a surface that heat conduction groove and pressure pipe contacted and extend along pressure pipe circumference, pierces through another surface that heat conduction groove and pressure pipe contacted, be equipped with the heat conduction strip in the heat conduction groove.

By adopting the technical scheme, the heat insulation plastic sleeve has better deformation capacity, can better finish the arrangement work of the heat insulation plastic sleeve and the heat tracing band when arranging the spiral and other heat tracing bands in other shapes, and the heat conduction strip conducts the heat on the outer surface of the heat tracing band, so that the heat on the surface of the heat tracing band back to the outer wall of the pressure guide pipe can be better in contact heat transfer with the outer wall of the pressure guide pipe through the end part of the heat conduction strip; the heat conduction groove enables better heat conduction of the heat conduction strip and can play a limiting role on the heat conduction strip, and the heat conduction strip is prevented from displacing along the length direction of the heat tracing band.

Further setting the following steps: the fixing piece is made of waterproof self-adhesive aluminum foil glass fiber cloth, and the waterproof self-adhesive aluminum foil glass fiber cloth is arranged outside the pressure guide pipe and the heat tracing band and used for fixing the heat tracing band on the pressure guide pipe.

Through adopting above-mentioned technical scheme, waterproof self-adhesion aluminium foil glass is fine cloth can with the bonding of pressure pipe outer wall, leads the bonding of pressure pipe outer wall through waterproof self-adhesion aluminium foil glass is fine cloth in advance, fixes the heat tracing area between waterproof self-adhesion aluminium foil glass is fine cloth and pressure pipe outer wall, prevents to arrange good heat tracing area deformation and removal.

Further setting the following steps: the heat preservation pipe sleeve is a PPR sponge heat preservation pipe sleeve, and the PPR sponge heat preservation pipe sleeve is sleeved outside the waterproof self-adhesive aluminum foil glass fiber cloth.

Through adopting above-mentioned technical scheme, PPR sponge heat preservation pipe box has good heat preservation, prevents frostbite and guard action, can fill up the clearance between pressure pipe outer wall and the PPR sponge heat preservation pipe box well.

Further setting the following steps: the heat preservation pipe sleeve is externally coated with a high-temperature glass wool thickening layer.

By adopting the technical scheme, the heat preservation and anti-freezing performance is further improved by utilizing the high-temperature glass wool thickening layer.

Further setting the following steps: and a galvanized iron sheet and a galvanized iron wire are arranged outside the high-temperature glass wool thickening layer.

By adopting the technical scheme, the galvanized iron sheet is used for wrapping the high-temperature glass wool thickening layer and has a good anti-corrosion effect, and the galvanized iron wire is used for bundling the galvanized iron sheet and plays a role in fixing.

To sum up, the utility model discloses following beneficial effect has:

1. the temperature sensor feeds back the temperature of the outer wall of the pressure guide pipe, the digital temperature controller controls the heating efficiency of the heat tracing band according to the temperature electric signal fed back, the heating efficiency of the heat tracing band can be increased when the temperature is low, the generation efficiency of the heat tracing band is reduced when the temperature is high, and even the heat tracing band does not generate heat, so that the anti-freezing function of the pressure guide pipe of the steam flowmeter is realized, and the normal work of the steam flowmeter is ensured.

2. The heat tracing band is spirally arranged, and the screw pitches at two ends are smaller than the middle screw pitch, so that the heating effect of the heat tracing band and the outer wall of the pressure guide pipe is more uniform, the temperature measured by the temperature sensor is ensured to be closer to the actual temperature of each position of the pressure guide pipe, and the control of the heat generating efficiency of the heat tracing band by the digital temperature controller is more accurate;

3. the arrangement of the waterproof self-adhesive aluminum foil glass fiber cloth, the PPR sponge heat-insulating pipe sleeve, the high-temperature glass wool thickening layer and the galvanized iron sheet has good corrosion resistance, heat insulation and waterproofness.

Drawings

FIG. 1 is a schematic structural diagram of a differential pressure steam flow meter of the prior art;

FIG. 2 is a schematic structural diagram of a self-control heat-preservation and anti-freezing device of a heat supply network steam flow meter according to the present embodiment;

FIG. 3 is a partial sectional view of a pressure pipe and an insulation structure on the pressure pipe in the present embodiment;

FIG. 4 is a schematic structural view of the heat tracing band and the heat insulating layer in the present embodiment;

fig. 5 is a sectional view taken along line a-a in fig. 4.

Reference numerals: 11. a throttle pipe; 12. a pressure guide pipe; 13. a differential pressure transmitter; 14. a display instrument; 15. a steam line; 2. a digital temperature controller; 21. a junction box; 3. a temperature sensor; 4. a heat tracing band; 5. a heat preservation pipe sleeve; 6. a fixing member; 41. a core wire; 42. a conductive plastic; 43. a flame retardant layer; 44. a thermal insulation layer; 45. a heat conducting groove; 7. a heat conducting strip; 8. thickening the high-temperature glass wool; 91. galvanized iron sheet; 92. galvanized iron wire.

Detailed Description

A self-control heat preservation and freeze prevention device of a heat supply network steam flowmeter is shown in figures 2 and 3 and comprises a digital temperature controller 2, a temperature sensor 3, a heat tracing band 4, a heat preservation pipe sleeve 5 and a fixing piece 6.

As shown in fig. 2 and 3, the heat tracing band 4 is a flame-proof and explosion-proof type heat tracing band 4, the heat tracing band 4 is spirally distributed on the outer wall of the pressure pipe 12, the spiral axis is coincident with the axis of the pressure pipe 12, and the pitch of the heat tracing band 4 gradually increases from both ends of the pressure pipe 12 to the middle of the pressure pipe 12.

As shown in fig. 3 and 4, the heat tracing band 4 includes a core wire 41, a conductive plastic 42 and a flame retardant layer 43, the conductive plastic 42 is flatly wrapped around the core, the flame retardant layer 43 is wrapped around the conductive plastic 42, and the flame retardant layer 43 is provided with a heat insulating layer 44 on the surface except the surface contacting with the outer wall of the pressure pipe 12.

As shown in fig. 3 and 5, the thermal insulation layer 44 is a thermal insulation plastic sleeve, the cross section of the thermal insulation plastic sleeve is in a shape of Chinese character 'ao', the opening faces the direction of the pressure pipe 12, a plurality of heat conduction grooves 45 distributed along the length direction of the thermal insulation plastic sleeve are formed in the inner wall of the opening, the heat conduction grooves 45 are formed in one surface of the heat conduction grooves 45 contacting the pressure pipe 12 and extend along the circumferential direction of the pressure pipe 12, another surface of the heat conduction grooves 45 contacting the pressure pipe 12 is penetrated, a heat conduction strip 7 is arranged in the heat conduction grooves 45, and the heat conduction strip 7 is a graphene strip.

As shown in fig. 2 and 3, the measuring end of the temperature sensor 3 is attached to the outer wall of the pressure pipe 12 and electrically connected to the digital temperature controller 2, the digital temperature controller 2 is mounted on the pressure pipe 12 or the steam pipe, and the digital temperature controller 2 and the heat trace band 4 are electrically connected through the junction box 21, so that the heating efficiency of the heat trace band 4 is controlled after receiving the electric signal of the temperature sensor 3.

As shown in fig. 3, the fixing member 6 is a waterproof self-adhesive aluminum foil glass fabric, wraps the outer wall of the pressure pipe 12 in a wrapping manner, and wraps the temperature sensor 3 and the heat tracing band 4 together, so that the temperature sensor 3 and the heat tracing band 4 are fixed.

As shown in fig. 3, the heat-insulating pipe sleeve 5 is a PPR sponge heat-insulating pipe sleeve 5, and is sleeved outside the waterproof self-adhesive aluminum foil glass fiber cloth. The PPR sponge heat-preservation pipe sleeve 5 is externally coated with a high-temperature glass wool thickening layer 8, the high-temperature glass wool thickening layer 8 is externally coated with a galvanized iron sheet 91, a galvanized iron wire 92 is arranged outside the galvanized iron sheet 91, and the galvanized iron wire 92 is tied outside the galvanized iron sheet 91 to fix the galvanized iron sheet 91.

The use principle is as follows:

when the air temperature is low, the temperature sensor 3 measures the surface temperature of the pressure guide pipe 12, the digital temperature controller 2 receives a temperature electric signal and judges that the temperature is lower than the set temperature, then the digital temperature controller 2 controls the heat tracing band 4 to generate heat, and when the heat tracing band 4 generates heat, the surface temperature of the pressure guide pipe 12 begins to rise, so that the temperature of condensed water in the pressure guide pipe 12 rises, icing is avoided, and the measurement accuracy of the steam flowmeter is ensured.

In the heating process of the heat tracing band 4, the temperature of the outer wall of the pressure guide tube 12 rises, the temperature sensor 3 monitors the temperature of the outer wall of the pressure guide tube 12 in real time and transmits the temperature to the digital temperature controller 2 in the form of an electric signal, the digital temperature controller 2 controls the heating efficiency of the heat tracing band 4 in real time according to the temperature, when the temperature is higher than a certain set temperature, the heating efficiency of the heat tracing band 4 is reduced, and when the temperature is lower than the certain set temperature, the heating efficiency of the heat tracing band 4 is increased, so that the temperature of the pressure guide tube 12 is ensured to be in a proper range, the freezing of condensed water in the pressure guide tube 12 is avoided, and the.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.

Claims

1. The utility model provides a heat supply network steam flowmeter automatic control heat preservation freeze-proof device which characterized in that: the temperature-controlled heating device comprises a digital temperature controller (2), a temperature sensor (3), a heat tracing band (4), a heat preservation pipe sleeve (5) and a fixing piece (6) used for fixing the heat tracing band (4) on the outer wall of a pressure pipe (12), wherein the heat tracing band (4) extends along the length direction of the pressure pipe (12), the heat preservation pipe sleeve (5) is sleeved outside the fixing piece (6), the temperature sensor (3) is arranged on the outer wall of the pressure pipe (12), the temperature sensor (3) is electrically connected with the digital temperature controller (2) to transmit a measured temperature electric signal to the digital temperature meter, and the digital temperature meter is electrically connected with the heat tracing band (4) so as to control the heating power of the heat tracing band (4) according to the temperature electric signal after receiving the temperature electric signal.

2. The self-controlled heat-preservation and anti-freezing device of the heat supply network steam flowmeter as recited in claim 1, characterized in that: the heat tracing band (4) is spirally distributed around the pressure guide pipe (12).

3. The self-controlled heat-preservation and anti-freezing device of the heat supply network steam flowmeter as claimed in claim 2, characterized in that: the spiral pitches of the heat tracing band (4) at two ends of the pressure guide pipe (12) are smaller than the spiral pitch in the middle.

4. The self-control heat-preservation and anti-freezing device of the heat supply network steam flowmeter as claimed in claim 1 or 2, wherein: the heat tracing band (4) is an anti-flaming and anti-explosion heat tracing band (4), the heat tracing band (4) comprises a core wire (41), conductive plastics (42) and a flame-retardant layer (43), the conductive plastics (42) are flatly cut and wrapped outside the core, the flame-retardant layer (43) is wrapped outside the conductive plastics (42), and the flame-retardant layer (43) is provided with a heat-insulating layer (44) on the surfaces except the surface which is in contact with the outer wall of the pressure pipe (12).

5. The self-controlled heat-preservation and anti-freezing device of the heat supply network steam flowmeter as recited in claim 4, characterized in that: insulating layer (44) are thermal-insulated plastic cover, thermal-insulated plastic cover's cross-section is the character cut in bas-relief, and the opening is towards connecting pipe (12) direction, has seted up a plurality of heat conduction grooves (45) that distribute along thermal-insulated plastic cover length direction on the open-ended inner wall, and heat conduction groove (45) are seted up and are just extended along connecting pipe (12) circumference in a surface that heat conduction groove (45) and connecting pipe (12) contacted, pierce through another surface that heat conduction groove (45) and connecting pipe (12) contacted, be equipped with heat conduction strip (7) in heat conduction groove (45).

6. The self-controlled heat-preservation and anti-freezing device of the heat supply network steam flowmeter as recited in claim 1, characterized in that: the fixing piece (6) is made of waterproof self-adhesive aluminum foil glass fiber cloth, and the waterproof self-adhesive aluminum foil glass fiber cloth is arranged outside the pressure guide pipe (12) and the heat tracing band (4) and used for fixing the heat tracing band (4) on the pressure guide pipe (12).

7. The self-controlled heat-preservation and anti-freezing device of the heat supply network steam flowmeter as recited in claim 6, wherein: the heat preservation pipe sleeve (5) is a PPR sponge heat preservation pipe sleeve (5), and the PPR sponge heat preservation pipe sleeve (5) is sleeved outside the waterproof self-adhesive aluminum foil glass fiber cloth.

8. The self-controlled heat-preservation and anti-freezing device of the heat supply network steam flowmeter as recited in claim 7, wherein: the heat-insulating pipe sleeve (5) is externally coated with a high-temperature glass wool thickening layer (8).

9. The self-controlled heat-preservation and anti-freezing device of the heat supply network steam flowmeter as recited in claim 8, wherein: galvanized iron sheet (91) and galvanized iron wire (92) are arranged outside the high-temperature glass wool thickening layer (8), and the galvanized iron wire (92) is tied up outside the galvanized iron sheet (91) and used for fixing the galvanized iron sheet (91).