CN2286949Y - Voltage-compensation tupe electrothermal cable - Google Patents
Voltage-compensation tupe electrothermal cable Download PDFInfo
- Publication number
- CN2286949Y CN2286949Y CN 95201956 CN95201956U CN2286949Y CN 2286949 Y CN2286949 Y CN 2286949Y CN 95201956 CN95201956 CN 95201956 CN 95201956 U CN95201956 U CN 95201956U CN 2286949 Y CN2286949 Y CN 2286949Y
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- heating
- wire
- voltage compensation
- compensation type
- type electric
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Abstract
The utility model relates to a voltage compensation type electrothermal cable, the working length of which is more than five times higher than parallel type electrothermal cables. The utility model solves the problem of heat tracing in pipelines with long distance or large diameter. The working length of the electrothermal cable is greatly increased by the complementary principle of voltage drop produced by added compensating conductors. The utility model is mainly characterized in that the electrothermal cable is provided with a compensating conductor (9), a compensating conductor insulation layer (8) and a connection point (10).
Description
The utility model relates to a kind of electric heating that is used to solve long distance or large diameter pipeline companion heat problem.
The maximal use length of existing parallel electric heating has only tens meters, maximum more than 200 meters, can not be used for companion's heat of long distance or large diameter pipeline.This is because there is resistance in transmission pressure, each heating joint from head end to tail end all can produce certain pressure drop, causes to produce the heating power error between head end and tail end, when using length long, this heating power error is very big, causes parallel electric heating head and the tail excessive temperature differentials.As will increasing use length, diameter that must the overstriking transmission pressure, various cost of raw and processed materials increase considerably with its volume, cause waste.This can consult U.S. Pat 3.757.086.Secondly, parallel electric heating also has following shortcoming 1): the material of heater element is the very high high resistant heating wire (as Cr20Ni80) of nickel content, and this class material scolding tin difficulty causes heater element and transmission of electricity core rosin joint to connect.Behind the parallel electric heating heating power, the oxidation gradually of both contact surfaces has increased contact resistance, causes heating unstable.2): be not quite similar because the radiating state of laying environment is installed, it is overheated to cause the bad part of radiating state to occur with the heater element that does not have obvious positive temperature coefficient, causes to burn out accidents such as short circuit.
The purpose of this utility model provides a kind of length of using than the long voltage compensation type electric heating more than 5 times of parallel electric heating, it has not only solved the electric heating problem that range of application is restricted owing to use length is not enough, and the overall length temperature is even, the reliability height, the life-span improves greatly.
The purpose of this utility model is achieved in that on existing parallel electric heating architecture basics, only increases a compensating wire and the new structure of compensating wire insulating barrier formation in the one side.At its head end, two power lines are connected with compensating wire with arbitrary transmission pressure respectively; At its tail end, another root transmission pressure is connected with compensating wire.After the energising, voltage drop head and the tail in two transmission pressures oppositely, the operating voltage difference of each heating joint that the resistance of two transmission pressures causes between head end and tail end is compensated mutually, and each heating joint power is equated, then the overall length surface temperature is even, and this has just increased use length.Secondly heater element adopts the PTC heating wire to replace original high resistant nichrome wire, has overcome the phenomenon of heating instability and easy burn-out.This be because the PTC heating wire be a kind of electrothermal alloy with obvious positive temperature coefficient, with it make heater element have the limit gentle automatic temperature-control characteristics, but and have solderability, so it is the desirable heater element of voltage compensation type electric heating.
Owing to adopt such scheme, only increase a compensating wire and compensating wire insulating barrier, just can obtain using more than 5 times the parallel electric heating of length, and the overall length temperature is even, has certain temperature-limiting character, the life-span improves greatly.
Below in conjunction with accompanying drawing and example the utility model is further specified.
Fig. 1 is a voltage compensation type electric heating outline drawing.
Fig. 2 is a voltage compensation type electric heating sectional view.
Fig. 3 is a voltage compensation type electric heating winding diagram.
Among the figure: 1. weave armouring 2. insulating barriers 3. heating wire 4. skeletons 5. core insulating barriers 6. transmission pressures 7. anticorrosive coats 8. compensating wire insulating barriers 9. compensating wires 10. tie points
As seen from Figure 1, the utility model only increases the mode of connection of a compensating wire (9) and Fig. 3: Head end, power supply is connected 9 with a transmission pressure (6) with compensating wire) be connected; At tail end, another root transmission of electricity is led Line (6) is connected 9 with compensating wire) connect, adopt power supply two phase lines respectively from the voltage-compensation tupe electrothermal cable head end With the transmission of electricity of tail end rightabout, the opposite direction of voltage drop [is head end and tail in two transmission pressures (6) The voltage drop direction of the transmission pressure (6) that end connects is to tail end from head end; Tail end and compensation are led The voltage drop direction of the transmission pressure (6) that line (9) connects is to head end from tail end], each heating joint two ends Voltage is compensated, and makes the heating power of each heating joint equate that the overall length surface temperature is even, head end, It is very little that the power error at tail end and middle part can be thought, this has just improved use length greatly, and this point is used The surface temperature of measuring between head end and tail end everywhere is confirmed. Example: the parallel accompanying-heat cable of existing design, Heating power 40W/m, the maximum when the design power error of two ends is ± 10% uses length to be 60m, 83 ℃ of its head end temperature, 74 ℃ of tail end temperature; When increasing use length to 150m, the head end temperature is 98 ℃ , the tail end temperature is 61 ℃; When increasing use length to 350m, the head end temperature reaches 132 ℃, the tail end temperature Degree only has 33 ℃, can't work. Now change system into voltage-compensation tupe electrothermal cable, constant in basic structure Increase a compensating wire in the situation, when using length as 350m, measure overall length surface temperature everywhere: 81 ℃ of head end temperature, 79 ℃ of tail ends, 82 ℃ and 80.5 ℃ at middle part. This voltage compensation type electric heating electricity is described Cable is when using length greater than 5 times, and the overall length heating is still very even.
Realize that preferred plan of the present utility model is to adopt the PTC heating wire of obvious positive temperature coefficient under the existing constant situation of voltage compensation type electric heating structure as far as possible, this PTC heating wire also should have higher electric resistivity and corrosion resistance except that having the high electrical resistance value, the thermal strain of this more favourable raising voltage compensation type electric heating and raising life-span.
Claims (5)
1. voltage compensation type electric heating, form it is characterized in that having compensating wire (9), compensating wire insulating barrier (8), tie point (10) by transmission of electricity core (6), transmission pressure insulating barrier (5), skeleton (4), heating wire (3), insulating barrier (2), braiding armouring (1), anticorrosive coat (7), compensating wire (9), compensating wire insulating barrier (8) and tie point (10).
2. according to claims 1 said voltage compensation type electric heating, it is characterized in that: at its head end, two power lines are connected with compensating wire (9) with arbitrary transmission pressure (6) respectively; At its tail end, another root transmission pressure (6) is connected with compensating wire (9), forms contact (10).
3. according to claims 1 said voltage compensation type electric heating, it is characterized in that: heating wire (3) employing has positive temperature coefficient (PTC) alloy material makes, and this PTC heating wire (3) can carry out the slicker solder welding.
4. according to claims 1 said voltage compensation type electric heating, it is characterized in that can be by using length to cut arbitrarily.
5. according to claims 2 described voltage compensation type electric heatings, it is characterized in that the overall length temperature is even.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95201956 CN2286949Y (en) | 1995-01-23 | 1995-01-23 | Voltage-compensation tupe electrothermal cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95201956 CN2286949Y (en) | 1995-01-23 | 1995-01-23 | Voltage-compensation tupe electrothermal cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2286949Y true CN2286949Y (en) | 1998-07-29 |
Family
ID=33855248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95201956 Expired - Fee Related CN2286949Y (en) | 1995-01-23 | 1995-01-23 | Voltage-compensation tupe electrothermal cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2286949Y (en) |
-
1995
- 1995-01-23 CN CN 95201956 patent/CN2286949Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |