CN114129933A - Movable heating device and method for transformer oil in fire test of true transformer - Google Patents
Movable heating device and method for transformer oil in fire test of true transformer Download PDFInfo
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- CN114129933A CN114129933A CN202111433531.6A CN202111433531A CN114129933A CN 114129933 A CN114129933 A CN 114129933A CN 202111433531 A CN202111433531 A CN 202111433531A CN 114129933 A CN114129933 A CN 114129933A
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
- A62C3/16—Fire prevention, containment or extinguishing specially adapted for particular objects or places in electrical installations, e.g. cableways
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/12—Oil cooling
- H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling
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Abstract
The invention relates to the field of transformer fire test equipment, in particular to a movable heating device and a movable heating method for transformer oil in a true transformer fire test. A movable heating device for transformer oil in a fire test of a true transformer comprises a movable base, a heat preservation and insulation box, a rotary heating cylinder, an oil inlet pipe, an oil outlet pipe, an internal heating mechanism and a rotary driving mechanism; the oil inlet that is connected with advancing oil pipe seal rotation is equipped with to rotary heating section of thick bamboo one end, and the rotary heating section of thick bamboo other end is equipped with the oil-out of being connected with play oil pipe seal rotation, and oil inlet pipe axis, play oil pipe axis and rotary heating section of thick bamboo axis collineation are equipped with interior heating mechanism in the rotary heating section of thick bamboo, and interior heating mechanism connects on advancing oil pipe. The rotary heating cylinder is arranged in the oil-gas heating device, and can be driven to rotate by the rotary driving mechanism, so that the transformer oil moves in the rotary heating cylinder, the internal heating mechanism is in contact with the transformer oil at different positions, and the heating effect and the heating efficiency are improved.
Description
Technical Field
The invention relates to the field of transformer fire test equipment, in particular to a movable heating device and a movable heating method for transformer oil in a true transformer fire test.
Background
Power transformers operating in the power grid are indispensable important components in the power system, and large transformers are generally oil-immersed power transformers filled with tens of tons or even hundreds of tons of insulating oil (transformer oil). If the transformer fails, the power grid in the whole area is broken down. Although the probability of fire occurring in the transformer is low, once the fire occurs for some reason, the safe and stable operation of the power grid is influenced. With the rapid increase of the voltage grade and the capacity of the power grid power transmission and transformation equipment, the advantages, the disadvantages and the reliability of the existing fire extinguishing technology and system equipment are verified through fire extinguishing tests. The development of a true transformer fire simulation test can provide scientific basis and guidance for the design and model selection of a transformer fire extinguishing system, power station construction, later maintenance and the like, and has great practical significance.
In actual operation at present, the oil temperature at the top of the transformer does not exceed 85 ℃. If the temperature of the transformer oil is too high due to the factors of too high room temperature, too heavy load and the like, the transformer oil can continuously operate at the temperature of over 85 ℃, but cannot exceed 95 ℃ at most. Meanwhile, multiple tests show that unheated transformer oil is difficult to ignite when flowing transformer oil fire is simulated due to the special physicochemical properties of high ignition point and flash point of the transformer oil. Therefore, in order to truly reflect the operation condition of the transformer and restore the fire scene of the real transformer, the transformer oil needs to be heated before the fire test of the real transformer. The transformer oil heating device in the prior art is in a static state in the heating cylinder, so that the heating mechanism cannot be in contact with different positions of the transformer oil, and the heating efficiency is low.
Disclosure of Invention
The invention aims to provide a movable heating device and a movable heating method for transformer oil in a fire test of a true transformer, which can effectively solve the problems in the prior art.
The purpose of the invention is realized by the following technical scheme:
according to a first aspect of the present invention, there is provided a transformer oil movable heating apparatus in a true transformer fire test.
In one embodiment, the movable heating device for transformer oil in the fire test of the true transformer comprises a movable base, a heat preservation and insulation box, a rotary heating cylinder, an oil inlet pipe, an oil outlet pipe, an internal heating mechanism and a rotary driving mechanism, wherein the movable base is arranged on the inner side of the rotary heating cylinder; an oil inlet in sealed rotary connection with the oil inlet pipe is formed in one end of the rotary heating cylinder, an oil outlet in sealed rotary connection with the oil outlet pipe is formed in the other end of the rotary heating cylinder, the axis of the oil inlet pipe, the axis of the oil outlet pipe and the axis of the rotary heating cylinder are collinear, an internal heating mechanism is arranged in the rotary heating cylinder, and the internal heating mechanism is connected to the oil inlet pipe; the oil inlet pipe and the oil inlet pipe are oppositely fixed at two ends of the heat preservation and insulation box; the heat preservation and insulation box is fixed on the movable base; the rotary driving mechanism is in transmission connection with the rotary heating cylinder so as to drive the rotary heating cylinder to rotate around the axis of the rotary heating cylinder.
Preferably, an external heating mechanism is arranged in the heat-insulating box, and comprises an electric heating ring and a supporting seat; the supporting seat is fixed on the inner side surface of the heat-insulation box, an electric heating ring is fixed in an annular mounting hole of the supporting seat, the electric heating ring is electrically connected with a PLC (programmable logic controller) installed on the outer side of the heat-insulation box, and the middle part of the rotary heating cylinder is matched on the inner side surface of the electric heating ring in a rolling manner.
Preferably, the top of the heat preservation and insulation box is connected with a turnover box cover in a rotating fit mode.
Preferably, the inner side surfaces of the heat-insulating box and the turnover box cover are both provided with aluminum silicate fiberboards.
Preferably, the oil outlet pipe comprises a vertical oil pumping pipe, a bent connecting pipe and a transverse oil discharge pipe; the pipe orifice at one end of the vertical oil pumping pipe is connected with the pipe orifice at one end of the transverse oil discharge pipe through a bent connecting pipe; the transverse oil discharge pipe is sealed and rotates in the oil outlet, the transverse oil discharge pipe is fixed on the side face of the heat insulation box, and the pipe orifice at the other end of the transverse oil discharge pipe is connected with the oil well pump.
Preferably, the side part of the pipe orifice at the other end of the vertical oil pumping pipe is uniformly provided with a plurality of oil pumping ports in a surrounding manner.
Preferably, the rotary heating cylinder comprises a circular cylinder body and an outer gear ring; an outer gear ring is fixed on the surface of the circular cylinder; the rotary driving mechanism comprises a driving motor and a driving gear fixed on an output shaft of the driving motor, and the driving gear is in meshing transmission connection with the outer gear ring.
Preferably, the rotary heating cylinder further comprises a swirl impeller; the rotational flow impeller is provided with a plurality of rotational flow impellers, and the rotational flow impellers are uniformly fixed on the inner wall of the circular cylinder in a surrounding manner by taking the axis of the circular cylinder as the center.
Preferably, the internal heating mechanism comprises an installation disc, an electric heating pipe, an internal guide column, an external guide column, a sliding seat and a return spring; the mounting disc is fixed at a pipe orifice where the oil inlet pipe is inserted into the rotary heating cylinder, and a plurality of inner and outer slideways are uniformly arranged on the mounting disc in a surrounding manner; a sliding seat is respectively in sliding fit in the inner and outer slideways, and the sliding seats are in sliding fit with the inner and outer guide columns fixed in the inner and outer slideways one by one; the inner ends of the sliding seats are respectively fixed with an electric heating pipe; each inner and outer guide post is sleeved with a return spring, one end of each return spring is fixedly connected with the sliding seat, and the other end of each return spring is fixedly connected with the inner side surfaces of the inner and outer slideways; the electric heating pipe is electrically connected with a PLC controller arranged outside the heat preservation and insulation box.
Preferably, the number of the electric heating tubes is six.
Preferably, the internal heating mechanism further comprises a temperature sensor, the temperature sensor is mounted on the mounting disc, and the temperature sensor is electrically connected with the PLC.
Preferably, the rotary heating cylinder further comprises an inner gear ring, and the inner gear ring is fixed on the inner wall of the rotary heating cylinder; the internal heating mechanism also comprises a driven gear, a driven shaft, a support frame, a friction driving wheel, a friction linkage disc, a linkage shaft, an irregular friction wheel, a friction rotating ring and a push-pull connecting rod; the inner side of the inner gear ring is in meshed transmission connection with a driven gear, the driven gear is fixed on a driven shaft, the driven shaft is in running fit with an installation disc, a friction driving wheel is arranged on the driven shaft, the friction driving wheel is in friction transmission connection with a friction linkage disc, the friction linkage disc and an irregular friction wheel are respectively fixed at two ends of a linkage shaft, the middle part of the linkage shaft is in running fit with the installation disc through a support frame, and the irregular friction wheel is in intermittent friction transmission connection with a friction rotating ring; the friction rotating ring is rotationally matched on the oil inlet pipe; evenly encircle many articulated shafts of fixed on the friction rotating ring, many articulated shafts rotate with many push-and-pull connecting rod one end and are connected, and many push-and-pull connecting rod other ends rotate one by one with a plurality of sliding seats and be connected.
Preferably, the friction transmission wheel comprises a transmission wheel body, a hexagonal slide column and a regulating screw rod; the driving wheel body is connected with the friction linkage disc in a vertical friction transmission mode, the driving wheel body is fixed at one end of the hexagonal sliding column, the other end of the hexagonal sliding column slides in the hexagonal slideway of the driven shaft, one end of the regulating screw rod rotates on the inner side face of the hexagonal slideway, and the middle of the regulating screw rod is in threaded transmission connection with the hexagonal sliding column.
Preferably, the adjusting screw rod is sleeved with a tensioning spring, and two ends of the tensioning spring are fixedly connected with the inner side surface of the hexagonal slideway and the hexagonal sliding column respectively.
Preferably, the oil inlet pipe is inserted into a pipe orifice in the rotary heating cylinder and is rotationally connected with a rotary oil injection pipe, and a plurality of injection holes are uniformly arranged on the pipe surface of the rotary oil injection pipe in a surrounding manner; the rotary oil spraying pipe is fixedly connected with a driven chain wheel, and the driven chain wheel is in transmission connection with a driving chain wheel fixed on a driven shaft through a chain.
According to a second aspect of the present invention, there is provided a method of heating transformer oil in a fire test of a true transformer.
In one embodiment, a method for heating transformer oil in a true transformer fire test, which is performed by using a movable heating device of the transformer oil in the true transformer fire test of the above embodiments, comprises the following steps:
injecting transformer oil to be heated into the rotary heating cylinder through the oil inlet pipe, and controlling the internal heating mechanism to heat the transformer oil;
detecting the temperature value of the transformer oil through a temperature sensor in the rotary heating cylinder, and feeding back a signal to a PLC (programmable logic controller);
step three, comparing the current temperature measurement value of the transformer oil with a target value; if the current temperature measurement value is higher than the target value, stopping the work of the internal heating mechanism; if the former temperature measurement value is lower than the target value, controlling the inner heating mechanism to continue heating; setting the detection period of the temperature sensor, and carrying out temperature measurement and temperature adjustment once in each detection period.
The invention has the beneficial effects that: the movable base is arranged inside the device, so that the device is convenient to integrally move; the rotary heating cylinder is arranged in the heating device, and can be driven to rotate by the rotary driving mechanism, so that the transformer oil moves in the rotary heating cylinder, the inner heating mechanism is in contact with the transformer oil at different positions, and the heating effect and the heating efficiency are improved; the internal heating mechanism arranged in the rotary heating cylinder and the external heating mechanism arranged outside the rotary heating cylinder are used for heating together, and the rotary heating cylinder is arranged in the heat insulation box, so that the heating efficiency and the heat insulation effect can be effectively improved.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a first general schematic diagram provided in accordance with an embodiment of the present invention;
FIG. 2 is a second overall view provided in accordance with an embodiment of the present invention;
FIG. 3 is a cross-sectional view of the overall structure provided by an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a heat-insulating box according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a rotary heating cartridge according to an embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating a partial structure of a rotary heating cartridge according to an embodiment of the present invention;
FIG. 7 is a schematic view of a flowline according to an embodiment of the present invention;
FIG. 8 is a first schematic structural diagram of an internal heating mechanism according to an embodiment of the present invention;
fig. 9 is a schematic structural view of a friction transmission wheel according to an embodiment of the present invention;
FIG. 10 is a schematic structural diagram of a rotary driving mechanism according to an embodiment of the present invention;
FIG. 11 is a schematic structural diagram of an external heating mechanism according to an embodiment of the present invention;
fig. 12 is a schematic structural view of a rotary fuel injection pipe according to an embodiment of the present invention;
fig. 13 is a second schematic structural diagram of an internal heating mechanism according to an embodiment of the present invention.
Icon: a mobile base 1; a heat preservation and insulation box 2; rotating the heating cylinder 3; a circular cylinder 301; an outer ring gear 302; a swirl impeller 303; an annulus gear 304; an oil inlet pipe 4; an oil outlet pipe 5; an internal heating mechanism 6; a mounting plate 601; an electric heating pipe 602; inner and outer guide posts 603; a slide mount 604; a return spring 605; a driven gear 606; a driven shaft 607; a support frame 608; a friction transmission wheel 609; a drive wheel body 609 a; hexagonal sliding pillars 609 b; a regulating screw 609 c; a tension spring 609 d; a friction linkage plate 610; a linkage shaft 611; an irregular friction wheel 612; a friction rotation ring 613; a push-pull link 614; a rotation drive mechanism 7; a drive motor 701; a drive gear 702; an external heating mechanism 8; an electrical heating ring 801; a support base 802; rotating the oil injection pipe 9; a driven sprocket 901; a drive sprocket 902.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or be indirectly disposed on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, the meaning of a plurality of or a plurality of is two or more unless specifically limited otherwise.
It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for understanding and reading the contents disclosed in the specification, and are not used for limiting the conditions that the present application can implement, so the present invention has no technical significance, and any structural modification, ratio relationship change or size adjustment should still fall within the scope of the technical content disclosed in the present application without affecting the efficacy and the achievable purpose of the present application. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present application, and changes or modifications in the relative relationship may be made without substantial technical changes.
The invention is described in further detail below with reference to fig. 1-13.
As shown in fig. 1-13, the movable heating device for transformer oil in a fire test of a true transformer comprises a movable base 1, a heat preservation and insulation box 2, a rotary heating cylinder 3, an oil inlet pipe 4, an oil outlet pipe 5, an internal heating mechanism 6 and a rotary driving mechanism 7; an oil inlet in sealed rotary connection with the oil inlet pipe 4 is formed in one end of the rotary heating cylinder 3, an oil outlet in sealed rotary connection with the oil outlet pipe 5 is formed in the other end of the rotary heating cylinder 3, an internal heating mechanism 6 is arranged in the rotary heating cylinder 3, and the internal heating mechanism 6 is connected to the oil inlet pipe 4; the oil inlet pipe 4 and the oil inlet pipe 4 are oppositely fixed at two ends of the heat preservation and insulation box 2; the heat preservation and insulation box 2 is fixed on the movable base 1; the rotary driving mechanism 7 is in transmission connection with the rotary heating cylinder 3 so as to drive the rotary heating cylinder 3 to rotate around the axis of the rotary heating cylinder. When the movable heating device for transformer oil in the fire test of the true transformer is used, firstly, the transformer oil to be heated is injected into the rotary heating cylinder 3 through the oil inlet pipe 4, then the internal heating mechanism 6 is controlled to be electrically started, the transformer oil in the rotary heating cylinder 3 is heated through the internal heating mechanism 6, the temperature value of the transformer oil is detected through the temperature sensor in the rotary heating cylinder 3 in the heating process, and a signal is fed back to the PLC; when the current temperature measurement value of the transformer oil is larger than the target value, the internal heating mechanism 6 stops working; if the former temperature measurement value is lower than the target value, controlling the inner heating mechanism 6 to continue heating; setting the detection period of the temperature sensor to be 10s, and carrying out measurement and temperature adjustment every 10 s; during heating, the rotary driving mechanism 7 can be started, the rotary driving mechanism 7 drives the rotary heating cylinder 3 to rotate around the axis of the rotary heating cylinder 3 in a transmission mode, and the transformer oil can be stirred to a certain degree through the matching of the internal heating mechanism 6 and the rotary heating cylinder 3, so that the transformer oil in the rotary heating cylinder 3 is heated more uniformly, and the heating efficiency is improved; the internal rotary heating cylinder 3 is arranged inside the heat insulation box 2, so that the heating efficiency and the heat insulation effect can be effectively improved.
An external heating mechanism 8 is arranged in the heat-insulating box 2, and the external heating mechanism 8 comprises an electric heating ring 801 and a supporting seat 802; the supporting seat 802 is fixed on the inner side surface of the heat-insulation box 2, the electric heating ring 801 is fixed in the annular mounting hole of the supporting seat 802, the electric heating ring 801 is electrically connected with the PLC installed on the outer side of the heat-insulation box 2, and the middle part of the rotary heating cylinder 3 is matched on the inner side surface of the electric heating ring 801 in a rolling manner. The internal heating mechanism 6 arranged in the rotary heating cylinder 3 and the external heating mechanism 8 arranged outside the rotary heating cylinder 3 are adopted for heating together, so that the transformer oil in the rotary heating cylinder 3 can be rapidly heated, the transformer oil at different positions can be in contact with the cylinder surface of the rotary heating cylinder 3 along with the rotation of the rotary heating cylinder 3, the heating effect of the electric heating ring 801 on the transformer oil at different positions is improved, the starting or closing of the electric heating ring 801 and the internal heating mechanism 6 can be controlled according to the actual condition, the regulation and control can be conveniently carried out according to the comparison between the current temperature measurement value and the target value of the transformer oil, the fastest heating efficiency is achieved, and the energy consumption is reduced as much as possible; except the heating function, the structure setting of electrical heating ring 801 and supporting seat 802 can also play certain supporting role to rotatory cartridge heater 3, improves the stability when rotatory cartridge heater 3 rotates, carries out the bearing support to rotatory cartridge heater 3.
The top of the heat preservation and insulation box 2 is connected with a turnover box cover in a rotating fit mode, so that the heat preservation and insulation box 2 can be opened or closed conveniently.
The inner side surfaces of the heat preservation and insulation box 2 and the turnover box cover are both provided with the aluminum silicate fiber boards, and the aluminum silicate fiber boards are good in heat preservation and insulation effect and beneficial to improving the heat preservation effect of the heated transformer oil.
The oil outlet pipe 5 comprises a vertical oil pumping pipe, a bent connecting pipe and a transverse oil discharging pipe; the pipe orifice at one end of the vertical oil pumping pipe is connected with the pipe orifice at one end of the transverse oil discharge pipe through a bent connecting pipe; the transverse oil discharge pipe is sealed and rotated in the oil outlet, the transverse oil discharge pipe is fixed on the side surface of the heat insulation box 2, and the pipe orifice at the other end of the transverse oil discharge pipe is connected with the oil well pump. Vertical oil pipe of taking out can take out the transformer oil that is located 3 inside belows of rotatory cartridge heater to carry to horizontal oil extraction pipe through crooked connecting pipe, horizontal oil extraction pipe and oil-well pump connection, so that carry out the oil extraction work under the control of oil-well pump.
The lateral part of the other end pipe orifice of the vertical oil pumping pipe is uniformly surrounded with a plurality of oil pumping ports, so that the oil pumping speed can be improved to a certain extent.
The rotary heating cylinder 3 comprises a circular cylinder body 301 and an outer gear ring 302; an outer gear ring 302 is fixed on the surface of the circular cylinder 301; the rotary drive mechanism 7 comprises a drive motor 701 and a drive gear 702 fixed on an output shaft of the drive motor 701, and the drive gear 702 is in meshing transmission connection with the outer gear ring 302. Driving motor 701 can drive gear 702 after starting up and rotate, drive gear 702 meshes the transmission outer gear ring 302 and rotates to drive circular cylinder 301 through outer gear ring 302 and rotate around self axis, circular cylinder 301 can advance oil pipe 4 and go out oil pipe 5 and go up the rotation, advance oil pipe 4 and go out oil pipe 5 and not only can play the effect of carrying transformer oil, can also play the effect of support, in order to guarantee that circular cylinder 301 is rotatory around self axis.
The rotary heating cylinder 3 further comprises a swirl impeller 303; the plurality of swirl impellers 303 are provided, and the plurality of swirl impellers 303 are uniformly fixed on the inner wall of the circular cylinder 301 in a surrounding manner by taking the axis of the circular cylinder 301 as the center. When the circular cylinder 301 rotates around the axis of the circular cylinder, the circular cylinder can drive the plurality of cyclone impellers 303 to perform surrounding motion, so that the cyclone effect is improved, the cyclone motion effect of transformer oil is improved, and finally the heating uniformity is improved.
The internal heating mechanism 6 comprises a mounting disc 601, an electric heating pipe 602, an internal guide column 603 and an external guide column 603, a sliding seat 604 and a return spring 605; the mounting disc 601 is fixed at a pipe orifice where the oil inlet pipe 4 is inserted into the rotary heating cylinder 3, and a plurality of inner and outer slideways are uniformly arranged on the mounting disc 601 in a surrounding manner; a sliding seat 604 is respectively in sliding fit in the inner and outer slide ways, and the sliding seats 604 are in sliding fit with the inner and outer guide posts 603 fixed in the inner and outer slide ways one by one; the inner ends of the sliding seats 604 are respectively fixed with an electric heating pipe 602; each inner and outer guide post 603 is sleeved with a return spring 605, one end of each return spring 605 is fixedly connected with the sliding seat 604, and the other end of each return spring 605 is fixedly connected with the inner side surface of each inner and outer slide way; the electric heating pipe 602 is electrically connected with a PLC controller arranged outside the heat preservation and insulation box 2. The mounting disc 601 inside the internal heating mechanism 6 is fixed at a pipe orifice where the oil inlet pipe 4 is inserted into the rotary heating cylinder 3, the plurality of internal and external slideways of the mounting disc 601 are in sliding fit with the plurality of electric heating pipes 602, when the rotary heating cylinder 3 rotates, the plurality of electric heating pipes 602 can slide in a certain range along with the movement of the transformer oil in the internal and external guide posts 603 and compress or stretch the reset spring 605, so that the transformer oil at different positions can be heated more uniformly, and the plurality of electric heating pipes 602 can play a role in stirring and mixing to a certain extent along with the rotation of the rotary heating cylinder 3, thereby improving the heating effect and the heating efficiency; the plurality of electric heating pipes 602 are electrically connected to the PLC controller, and the number of electric heating pipes to be turned on can be selected under the control of the PLC controller, so as to heat the transformer oil with different temperature values.
The number of the electric heating pipes 602 is six.
The rotary heating cylinder 3 further comprises an inner gear ring 304, and the inner gear ring 304 is fixed on the inner wall of the rotary heating cylinder 3; the internal heating mechanism 6 further comprises a driven gear 606, a driven shaft 607, a support frame 608, a friction driving wheel 609, a friction linkage disc 610, a linkage shaft 611, an irregular friction wheel 612, a friction rotating ring 613 and a push-pull connecting rod 614; the inner side of the inner gear ring 304 is in meshing transmission connection with a driven gear 606, the driven gear 606 is fixed on a driven shaft 607, the driven shaft 607 is in rotating fit with the mounting disc 601, a friction driving wheel 609 is arranged on the driven shaft 607, the friction driving wheel 609 is in friction transmission connection with a friction linkage disc 610, the friction linkage disc 610 and an irregular friction wheel 612 are respectively fixed at two ends of a linkage shaft 611, the middle part of the linkage shaft 611 is in rotating fit with the mounting disc 601 through a support frame 608, and the irregular friction wheel 612 is in intermittent friction transmission connection with a friction rotating ring 613; the friction rotating ring 613 is rotationally fitted on the oil inlet pipe 4; a plurality of hinge shafts are uniformly fixed on the friction rotating ring 613 in a surrounding manner, the hinge shafts are rotatably connected with one ends of a plurality of push-pull connecting rods 614, and the other ends of the plurality of push-pull connecting rods 614 are rotatably connected with a plurality of sliding seats 604 one by one. When the rotary heating cylinder 3 rotates, the inner gear ring 304 can be driven to rotate, when the inner gear ring 304 rotates, the driven gear 606 can be driven to rotate in a meshing transmission manner, when the driven gear 606 rotates, the driven shaft 607 can be driven to rotate, when the driven shaft 607 rotates, the friction transmission wheel 609 can be driven to rotate in a friction transmission manner, the friction transmission wheel 609 drives the friction linkage disk 610 to rotate, the friction linkage disk 610 drives the irregular friction wheel 612 to rotate through the linkage shaft 611, when the irregular friction wheel 612 rotates to be in contact with the friction rotation ring 613, the friction rotation ring 613 can be driven to perform a certain range of rotary motion, the friction rotation ring 613 drives the plurality of push-pull connecting rods 614 to perform a certain range of motion, the other ends of the plurality of push-pull connecting rods 614 pull or push the plurality of sliding seats 604 to slide on the plurality of inner and outer guide posts 603 and stretch or compress the plurality of return springs 605, so as to drive the plurality of electric heating pipes 602 to perform the movement in the inner and outer direction, when the irregular friction wheel 612 rotates to be separated from the friction rotating ring 613, the sliding seats 604 drive the electric heating tubes 602 to return to the original position under the elastic force of the return springs 605, so that the positions of the electric heating tubes 602 are changed continuously, and finally the heating uniformity and the heating efficiency are improved.
The friction transmission wheel 609 comprises a transmission wheel body 609a, a hexagonal sliding column 609b and a regulating screw 609 c; the driving wheel body 609a is vertically connected with the friction linkage disc 610 in a friction transmission mode, the driving wheel body 609a is fixed at one end of a hexagonal sliding column 609b, the other end of the hexagonal sliding column 609b slides in a hexagonal slideway of the driven shaft 607, one end of an adjusting screw 609c rotates on the inner side face of the hexagonal slideway, and the middle of the adjusting screw 609c is in threaded transmission connection with the hexagonal sliding column 609 b. The relative position of the driving wheel body 609a inside the friction driving wheel 609 and the friction linkage plate 610 can be properly adjusted before the invention is used, so as to change the frequency of driving the plurality of electric heating pipes 602 to move when the rotary heating cylinder 3 rotates; during adjustment, the contact position of the adjusting screw 609c and the hexagonal sliding column 609b can be changed by rotating the adjusting screw 609c, so that the hexagonal sliding column 609b is driven to slide in the hexagonal sliding way, and finally the relative position of the driving wheel body 609a and the friction linkage disc 610 is changed.
A tensioning spring 609d is sleeved on the adjusting screw 609c, two ends of the tensioning spring 609d are respectively and fixedly connected with the inner side surface of the hexagonal slideway and the hexagonal sliding column 609b, and the tensioning spring 609d can improve the stability of the hexagonal sliding column 609b after movement and finally improve the stability of the driving wheel body 609a after relative movement with the friction linkage plate 610.
The oil inlet pipe 4 is inserted into a pipe orifice in the rotary heating cylinder 3 and is rotationally connected with a rotary oil injection pipe 9, and a plurality of injection holes are uniformly arranged on the pipe surface of the rotary oil injection pipe 9 in a surrounding manner; the rotary oil injection pipe 9 is fixedly connected with a driven sprocket 901, and the driven sprocket 901 is connected with a driving sprocket 902 fixed on a driven shaft 607 through chain transmission. The driving sprocket 902 can rotate under the drive of the driven shaft 607, the driving sprocket 902 rotates through the chain drive driven sprocket 901, the driven sprocket 901 rotates to drive the rotary oil injection pipe 9 to rotate, the transformer oil can be rotationally injected into the rotary heating cylinder 3 through the rotary oil injection pipe 9, the flowing transformer oil can be conveniently heated to form rotational flow, the distribution uniformity of the transformer oil in the rotary heating cylinder 3 can be improved, and the heating uniformity is improved; in addition, the rotary heating cylinder 3, the plurality of electric heating pipes 602 and the rotary oil spraying pipe 9 can be driven to rotate only by one motor arranged outside the rotary heating cylinder 3, so that the energy consumption can be effectively reduced, the occupied space of equipment is reduced, and the operation and the use are easier.
In another embodiment, there is provided a method for heating transformer oil in a true transformer fire test, in which the transformer oil movable heating device in the true transformer fire test of the above embodiment is used for heating, the method comprising the following steps:
step one, injecting transformer oil to be heated into the rotary heating cylinder 3 through the oil inlet pipe 4, and controlling the internal heating mechanism 6 to heat the transformer oil;
detecting the temperature value of the transformer oil through a temperature sensor in the rotary heating cylinder 3, and feeding back a signal to a PLC (programmable logic controller);
step three, comparing the current temperature measurement value of the transformer oil with a target value; if the current temperature measurement value is higher than the target value, the internal heating mechanism 6 stops working; if the former temperature measurement value is lower than the target value, controlling the inner heating mechanism 6 to continue heating; the detection period of the temperature sensor is set to 10s, and measurement and temperature adjustment are performed every 10 s.
The principle is as follows: when the movable heating device for transformer oil in the fire test of the true transformer is used, firstly, the transformer oil to be heated is injected into the rotary heating cylinder 3 through the oil inlet pipe 4, then the internal heating mechanism 6 is controlled to be electrically started, the transformer oil in the rotary heating cylinder 3 is heated through the internal heating mechanism 6, the temperature value of the transformer oil is detected through the temperature sensor in the rotary heating cylinder 3 in the heating process, and a signal is fed back to the PLC; when the current temperature measurement value of the transformer oil is larger than the target value, the internal heating mechanism 6 stops working; if the former temperature measurement value is lower than the target value, controlling the inner heating mechanism 6 to continue heating; setting the detection period of the temperature sensor to be 10s, and carrying out measurement and temperature adjustment every 10 s; during heating, the rotary driving mechanism 7 can be started, the rotary driving mechanism 7 drives the rotary heating cylinder 3 to rotate around the axis of the rotary heating cylinder 3 in a transmission mode, and the transformer oil can be stirred to a certain degree through the matching of the internal heating mechanism 6 and the rotary heating cylinder 3, so that the transformer oil in the rotary heating cylinder 3 is heated more uniformly, and the heating efficiency is improved; the internal rotary heating cylinder 3 is arranged inside the heat insulation box 2, so that the heating efficiency and the heat insulation effect can be effectively improved.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (16)
1. Transformer oil movable heating device among true transformer fire test, its characterized in that: comprises a movable base (1), a heat preservation and insulation box (2), a rotary heating cylinder (3), an oil inlet pipe (4), an oil outlet pipe (5), an internal heating mechanism (6) and a rotary driving mechanism (7); an oil inlet in sealed rotary connection with the oil inlet pipe (4) is formed in one end of the rotary heating cylinder (3), an oil outlet in sealed rotary connection with the oil outlet pipe (5) is formed in the other end of the rotary heating cylinder (3), an internal heating mechanism (6) is arranged in the rotary heating cylinder (3), and the internal heating mechanism (6) is connected to the oil inlet pipe (4); the oil inlet pipe (4) and the oil inlet pipe (4) are relatively fixed at two ends of the heat preservation and insulation box (2); the heat preservation and insulation box (2) is fixed on the movable base (1); the rotary driving mechanism (7) is in transmission connection with the rotary heating cylinder (3) to drive the rotary heating cylinder (3) to rotate around the axis of the rotary heating cylinder.
2. The movable heating device for transformer oil in the fire test of the true transformer according to claim 1, characterized in that: an external heating mechanism (8) is arranged in the heat-insulating box (2), and the external heating mechanism (8) comprises an electric heating ring (801) and a supporting seat (802); the supporting seat (802) is fixed on the inner side surface of the heat-insulation box (2), the electric heating ring (801) is fixed in the annular mounting hole of the supporting seat (802), the electric heating ring (801) is electrically connected with the PLC installed on the outer side of the heat-insulation box (2), and the middle part of the rotary heating cylinder (3) is matched on the inner side surface of the electric heating ring (801) in a rolling manner.
3. The movable heating device for transformer oil in the fire test of the true transformer according to claim 1, characterized in that: the top of the heat preservation and insulation box (2) is connected with a turnover box cover in a rotating fit mode.
4. The movable heating device for transformer oil in the fire test of the true transformer according to claim 1, characterized in that: and aluminum silicate fiberboards are arranged on the inner side surfaces of the heat-preservation and heat-insulation box (2) and the turnover box cover.
5. The movable heating device for transformer oil in the fire test of the true transformer according to claim 1, characterized in that: the oil outlet pipe (5) comprises a vertical oil pumping pipe, a bent connecting pipe and a transverse oil discharging pipe; the pipe orifice at one end of the vertical oil pumping pipe is connected with the pipe orifice at one end of the transverse oil discharge pipe through a bent connecting pipe; the transverse oil discharge pipe is sealed and rotated in the oil outlet, the transverse oil discharge pipe is fixed on the side surface of the heat preservation and heat insulation box (2), and the pipe orifice at the other end of the transverse oil discharge pipe is connected with the oil well pump.
6. The movable heating device for transformer oil in the fire test of the true transformer according to claim 5, wherein: and the side part of the pipe orifice at the other end of the vertical oil pumping pipe is uniformly provided with a plurality of oil pumping ports in a surrounding manner.
7. The movable heating device for transformer oil in the fire test of the true transformer according to claim 1, characterized in that: the rotary heating cylinder (3) comprises a circular cylinder body (301) and an outer gear ring (302); an outer gear ring (302) is fixed on the surface of the circular cylinder (301); the rotary driving mechanism (7) comprises a driving motor (701) and a driving gear (702) fixed on an output shaft of the driving motor (701), and the driving gear (702) is in meshing transmission connection with the outer gear ring (302).
8. The movable heating device for transformer oil in the fire test of the true transformer according to claim 7, wherein: the rotary heating cylinder (3) further comprises a swirl impeller (303); the plurality of swirl impellers (303) are arranged, and the plurality of swirl impellers (303) are uniformly fixed on the inner wall of the circular cylinder (301) in a surrounding manner by taking the axis of the circular cylinder (301) as the center.
9. The movable heating device for transformer oil in the fire test of the true transformer according to claim 7, wherein: the internal heating mechanism (6) comprises a mounting disc (601), an electric heating pipe (602), an internal guide column and an external guide column (603), a sliding seat (604) and a return spring (605); the mounting disc (601) is fixed at a pipe orifice where the oil inlet pipe (4) is inserted into the rotary heating cylinder (3), and a plurality of inner and outer slideways are uniformly arranged on the mounting disc (601) in a surrounding manner; a sliding seat (604) is respectively in sliding fit in the inner and outer slideways, and the sliding seats (604) are in sliding fit with the inner and outer guide columns (603) fixed in the inner and outer slideways one by one; the inner ends of a plurality of sliding seats (604) are respectively fixed with an electric heating pipe (602); each inner and outer guide post (603) is sleeved with a return spring (605), one end of each return spring (605) is fixedly connected with the sliding seat (604), and the other end of each return spring (605) is fixedly connected with the inner side surfaces of the inner and outer slideways; the electric heating pipe (602) is electrically connected with a PLC controller arranged on the outer side of the heat preservation and insulation box (2).
10. The movable heating device for transformer oil in the fire test of the true transformer according to claim 9, wherein: the number of the electric heating pipes (602) is six.
11. The movable heating device for transformer oil in the fire test of the true transformer according to claim 9, wherein: interior heating mechanism (6) still include temperature sensor, and temperature sensor installs on mounting disc (601), and PLC controller is connected to the temperature sensor electricity.
12. The movable heating device for transformer oil in the fire test of the true transformer according to claim 9, wherein: the rotary heating cylinder (3) further comprises an inner gear ring (304), and the inner gear ring (304) is fixed on the inner wall of the rotary heating cylinder (3); the internal heating mechanism (6) further comprises a driven gear (606), a driven shaft (607), a support frame (608), a friction driving wheel (609), a friction linkage disc (610), a linkage shaft (611), an irregular friction wheel (612), a friction rotating ring (613) and a push-pull connecting rod (614); the inner side of the inner gear ring (304) is in meshed transmission connection with a driven gear (606), the driven gear (606) is fixed on a driven shaft (607), the driven shaft (607) is in running fit with the mounting disc (601), a friction driving wheel (609) is arranged on the driven shaft (607), the friction driving wheel (609) is in friction transmission connection with a friction linkage disc (610), the friction linkage disc (610) and an irregular friction wheel (612) are respectively fixed at two ends of a linkage shaft (611), the middle part of the linkage shaft (611) is in running fit with the mounting disc (601) through a supporting frame (608), and the irregular friction wheel (612) is in intermittent friction transmission connection with a friction rotating ring (613); the friction rotating ring (613) is rotationally matched on the oil inlet pipe (4); a plurality of hinged shafts are uniformly and fixedly wound on the friction rotating ring (613), the hinged shafts are rotatably connected with one ends of a plurality of push-pull connecting rods (614), and the other ends of the push-pull connecting rods (614) are rotatably connected with a plurality of sliding seats (604) one by one.
13. The movable heating device for transformer oil in the fire test of the true transformer according to claim 12, wherein: the friction transmission wheel (609) comprises a transmission wheel body (609a), a hexagonal sliding column (609b) and a regulating screw (609 c); the transmission wheel body (609a) is connected with the friction linkage disc (610) in a vertical friction transmission mode, the transmission wheel body (609a) is fixed at one end of a hexagonal sliding column (609b), the other end of the hexagonal sliding column (609b) slides in a hexagonal slideway of the driven shaft (607), one end of a regulating screw rod (609c) rotates on the inner side face of the hexagonal slideway, and the middle of the regulating screw rod (609c) is in threaded transmission connection with the hexagonal sliding column (609 b).
14. The movable heating device for transformer oil in the fire test of the true transformer according to claim 13, wherein: and a tensioning spring (609d) is sleeved on the adjusting screw (609c), and two ends of the tensioning spring (609d) are respectively and fixedly connected with the inner side surface of the hexagonal slideway and the hexagonal sliding column (609 b).
15. The movable heating device for transformer oil in the fire test of the true transformer according to claim 14, wherein: the oil inlet pipe (4) is inserted into a pipe orifice in the rotary heating cylinder (3) and is rotationally connected with a rotary oil injection pipe (8), and a plurality of injection holes are uniformly arranged on the pipe surface of the rotary oil injection pipe (8) in a surrounding manner; the rotary oil injection pipe (8) is fixedly connected with a driven chain wheel (801), and the driven chain wheel (801) is in transmission connection with a driving chain wheel (802) fixed on a driven shaft (607) through a chain.
16. A method for heating transformer oil in a true transformer fire test, which is carried out by adopting a movable heating device of the transformer oil in the true transformer fire test according to any one of claims 1 to 15, and is characterized in that: the heating method comprises the following steps:
step one, injecting transformer oil to be heated into the rotary heating cylinder (3) through the oil inlet pipe (4), and controlling the internal heating mechanism (6) to heat the transformer oil;
detecting the temperature value of the transformer oil through a temperature sensor in the rotary heating cylinder (3), and feeding back a signal to a PLC (programmable logic controller);
step three, comparing the current temperature measurement value of the transformer oil with a target value; if the current temperature measurement value is higher than the target value, the internal heating mechanism (6) stops working; if the former temperature measurement value is lower than the target value, controlling the internal heating mechanism (6) to continue heating; setting the detection period of the temperature sensor, and carrying out temperature measurement and temperature adjustment once in each detection period.
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| CN202111433531.6A CN114129933A (en) | 2021-11-29 | 2021-11-29 | Movable heating device and method for transformer oil in fire test of true transformer |
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