CN2251852Y

CN2251852Y - PTC type heating cable

Info

Publication number: CN2251852Y
Application number: CN 95219073
Authority: CN
Inventors: 范振明
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-08-04
Filing date: 1995-08-04
Publication date: 1997-04-09
Anticipated expiration: 2005-08-04

Abstract

The utility model discloses a heating cable for heating. The structure of the utility model is that conducting wires are threaded in an external sleeve pipe; insulated heat conducting filler which is arranged between the conducting wire and the external sleeve pipe. The utility model is characterized in that the inner of the external sleeve pipe is provided with at least two roots of conducting wires, and the conducting wires are arranged in a PTC semiconductor layer. The heating cable can be laid on the external wall of oil pipes as oil well heating cables, can be used for the heating and heat insulating of oil pipelines, and can also be positioned in hollow sucker rods to replace heating sucker rods. The heating cable fully utilizes PTC temperature effect to achieve temperature automatic control and automatic limit function; thus, the temperature of heating media is made constantly conformed, overheat damage is eliminated, electrical energy can be saved greatly, and the utility model is a multifunction heating cable.

Description

A kind of PTC electric heating cable

The utility model relates to a kind of cable, specifically a kind of electric heating cable that heats usefulness.

In the oil exploitation process, because the wax deposition phenomenon is serious, the existing heat extractors that adopt carry out petroleum thermal recovery more, to prevent the wax deposition phenomenon at present.Heat extractor generally is that sucker rod is made heating sucker rod, and its structure is to be installed with lead or copper rod in sleeve pipe, is added with the insulating heat-conductive inserts between sleeve pipe and lead or the copper rod.Sucker rod is connected into one the tunnel, and oil well pump that relies on the shaft bottom etc. joins center conductor and sucker rod sleeve pipe, forms electric loop.Connect aboveground power supply and control device, can make sucker rod become a heat-generating pipe, heating is along the oil that moves on the well casing.The top and the bottom heating power of this petroleum thermal recovery device is basic identical, but when reality is used, higher because of bottom oil temperature, and wax deposition is to occur in oil well top, so the heated zones of heat extractor is changed to some extent during practical application with the difference of last hypomere.But the heat extractor of existing structure does not all reach this requirement, thereby causes consumption electric energy height and bottom to have this phenomenon of waste of energy to take place.Charged because of sucker rod in addition, need to set up an insulated isolated device at well head, both increased cost, there is unsafe hidden danger to exist again.

It is good that the purpose of this utility model just provides a kind of fail safe, can regulate the electric heating cable of heating power with the extraneous circumstance variation voluntarily, to adapt to the special requirement of oil exploitation, saves energy when ensureing oil yield.

The utility model is achieved in that and still is installed with lead and the insulating heat-conductive inserts is arranged in outer tube that the lead of wearing has at least two, and lead is arranged in the PTC semiconductor layer.Owing at least two leads are arranged, thereby can directly constitute electric loop, and needn't do electric loop, thereby make outer tube not charged by outer tube.Be used for oil well and can make the inner energising of sucker rod give birth to heat and the outside is not charged, the fail safe that makes well head greatly high.In addition, the PTC semiconductor layer between lead has formed the equivalent parallel resistance of positive temperature rise coefficient resistance characteristic, and in the warm higher environment of shaft bottom oil, resistance is higher, and electric current is little, and heating power is little; On oil well top, temperature is low, resistance is little, electric current is big, heating power is big.So just make the electric current reasonable distribution,, and guarantee its wax deposition not when outlet, ensured the ordinary production of oil well with minimum electric energy heating oil.

Below in conjunction with accompanying drawing the utility model is further described.

Fig. 1, Fig. 2 are the sectional views of two kinds of embodiment of the utility model.

As shown in Figure 1, become PTC semiconductor layer 5, simultaneously two copper conductors 2 are made in the PTC semiconductor layer 5, and two leads are not contacted with the abundant hybrid process of fluororesin and carbon dust.The PTC semiconductor layer is pressed in the outer tube 1, inserts insulating heat-conductive inserts 4 again, promptly make an electric heating cable.Inserts 4 can be selected the polytetrafluoroethylmaterial material of good insulating for use.

For increasing the purposes of electric heating cable, also can in insulating heat-conductive inserts 4, penetrate at least two additive wires 3, and separate by PTC semiconductor layer 5.The radical that specifically penetrates lead 3 should be identical with the radical of lead 2 in the semiconductor layer 5.The effect of this additive wire is set, the one, can the lead in the semiconductor layer 5 is in parallel with additive wire, behind the access power supply, can reduce the voltage drop of long distance.The 2nd, additive wire can be other electric power supplies, with the electronic or measurement of finishing down-hole (or remote) etc.The 3rd, all leads and be a single core as single phase power supply, then can be used for drifting or perforation etc.

Among Fig. 1, the cross section of PTC semiconductor layer 5 can be made into and is " 1 " font, the inserts 4 that 2, two additive wires 3 of a lead are arranged in PTC semiconductor layer 5 both sides respectively is set two ends up and down at " 1 " font.This electric heating cable is applicable in the single phase power supply circuit.

The cross section of PTC semiconductor layer 5 is " Y " shape among Fig. 2, and the inserts 4 between three angles that 2, three additive wires 3 of a lead are arranged in PTC semiconductor layer 5 respectively is set in " Y " shape three ends.This electric heating cable is applicable in the three-phase power line.If lead in the semiconductor layer and additive wire are connected into " Y " shape connected mode respectively in the bottom, constitute two Y shape automatic controls and permanent power electric heating warming, then being used to force thermal field, to close effect ideal.

In Fig. 1,2, the additive wire 3 in the middle of the inserts 4 can be made with copper rod, has steel wire to be combined into one in the middle of lead 3, constitutes the steel core copper conductor, to improve the tensile strength of additive wire 3 and whole cable.Also should be wrapped with insulating barrier 6 in lead 3 peripheries, this insulating barrier can be selected polyamide composite film for use, is wrapped on the lead 3, to improve insulation property, prevents short circuit.

This cable length can reach 1200 meters, and can intercept arbitrarily as required.Both can be laid in oil-pipe external wall,, also can be loaded in the hollow sucker rod, substitute electric heating rod to substitute the auspicious companion's hot line of chatting about of the U.S. as the oil well heating cable.This cable also can be used for the heating, temperature keeping of petroleum pipeline, to replace common and the self-controlling electrothermal band.In a word, this cable makes full use of the PTC temperature effect, has reached temp autocontrolled and has limit function certainly, makes heated medium temperature constant unanimity, has eliminated and has crossed thermal loss, and saves energy is a kind of heating cable of using more significantly.

Claims

1, a kind of PTC electric heating cable is installed with lead (2) in outer tube (1), insulating heat-conductive inserts (4) is arranged between lead and the outer tube, it is characterized in that being installed with at least two leads (2) in outer tube (1), and lead (2) is arranged in PTC semiconductor layer (5).

2, electric heating cable according to claim 1 is characterized in that being installed with at least two additive wires (3) in insulating heat-conductive inserts (4), and is separated by PTC semiconductor layer (5).

3, electric heating cable according to claim 2, the cross section that it is characterized in that PTC semiconductor layer (5) is " 1 " font, a lead (2) respectively is set two ends up and down at " 1 " font, two additive wires (3) are arranged in PTC semiconductor layer (5) both sides inserts (4).

4, electric heating cable according to claim 2, the cross section that it is characterized in that PTC semiconductor layer (5) is " Y " shape, in " Y " shape three ends a lead (2) is set respectively, three additive wires (3) are arranged in the inserts (4) between three angles of PTC semiconductor layer (5).

5, electric heating cable according to claim 2 is characterized in that additive wire (3) center in the middle of the inserts (4) has steel wire to be combined into one, and is wrapped with insulating barrier (6) in lead (3) periphery.