CN112366066B

CN112366066B - Respirator for transformer

Info

Publication number: CN112366066B
Application number: CN202011007650.0A
Authority: CN
Inventors: 张文清; 张文霞
Original assignee: State Grid Corp of China SGCC; Handan Power Supply Co of State Grid Hebei Electric Power Co Ltd
Current assignee: State Grid Corp of China SGCC; Handan Power Supply Co of State Grid Hebei Electric Power Co Ltd
Priority date: 2020-09-23
Filing date: 2020-09-23
Publication date: 2021-08-06
Anticipated expiration: 2040-09-23
Also published as: CN112366066A

Abstract

The invention provides a breather for a transformer, which belongs to the technical field of transformers and comprises a shell, an electric heating element, an electric valve and a controller, wherein the shell is provided with a plurality of electric heating elements; wherein, the interior of the shell is used for filling a desiccant; the bottom end of the shell is used for being connected with a transformer conservator, and the bottom wall of the shell is provided with a breathing channel used for communicating the inside of the transformer conservator, the inside of the shell and the outside; the top wall of the shell is provided with an air inlet channel and an air outlet channel which are respectively communicated with the outside; the electric heating element is arranged in the shell and used for heating the drying agent; the electric valve is arranged on the top wall of the shell and has a first state of closing the air inlet channel and opening the exhaust channel and a second state of opening the air inlet channel and closing the exhaust channel; the controller is arranged on the outer wall of the shell and is respectively and electrically connected with the electric heating element and the electric valve. According to the respirator for the transformer, the water absorption performance of the drying agent can be quickly recovered through heating and dehumidification when the drying agent fails, the shell does not need to be disassembled to replace the drying agent, and waste of manpower and materials is reduced.

Description

Respirator for transformer

Technical Field

The invention belongs to the technical field of transformers, and particularly relates to a respirator for a transformer.

Background

The respirator is a safety protection device arranged at the tail end of a pipeline for communicating an oil conservator of the transformer with air, when the temperature of oil in the transformer rises and expands, redundant air in the transformer can be exhaled, when the temperature of the oil of the transformer decreases and contracts, air can be inhaled from the outside, when the air is inhaled into the outside, in order to avoid the phenomenon that oil in the transformer is damped and deteriorated, moisture in the air needs to be absorbed through silica gel in the respirator, and therefore the inhaled air of the transformer is ensured to be dry air.

The main component of silica gel is active alumina, which belongs to a drying agent, the color of the silica gel is blue under the normal dry state, after the silica gel in the respirator becomes damp due to long-term moisture absorption, the color of the silica gel can be changed (becomes red), the water absorption of the silica gel after becoming red due to damp is reduced, in order to avoid the transformer from sucking moist air, a maintenance and inspection person finds that the silica gel becomes red in the inspection process, the silica gel needs to be replaced in time, the respirator needs to be disassembled to operate after the transformer is shut down during replacement, the normal work of the transformer is not only influenced, a large amount of manpower and material consumption can be caused, and the waste is serious.

Disclosure of Invention

The invention aims to provide a breather for a transformer, and aims to solve the problems that the normal work of the transformer is influenced and manpower and material resources are wasted because silica gel in the existing breather needs to be replaced after being wetted and failed.

In order to achieve the purpose, the invention adopts the technical scheme that: provided is a respirator for a transformer, including:

a housing, the interior of which is filled with a desiccant; the bottom end of the shell is used for being connected with a transformer conservator, and the bottom wall of the shell is provided with a breathing channel used for communicating the inside of the transformer conservator, the inside of the shell and the outside; the top wall of the shell is provided with an air inlet channel and an air outlet channel which are respectively communicated with the outside;

the electric heating element is arranged in the shell and used for heating the drying agent;

the electric valve is arranged on the top wall of the shell and has a first state of closing the air inlet channel and opening the air outlet channel and a second state of opening the air inlet channel and closing the air outlet channel;

and the controller is arranged on the outer wall of the shell and is electrically connected with the electric heating element and the electric valve respectively.

As another embodiment of the application, a first air hole communicated with the inside of the shell, a second air hole and a third air hole communicated with the inside of the transformer conservator and a fourth air hole communicated with the outside are arranged on the breathing channel, and a one-way valve is arranged between the second air hole and the third air hole in the breathing channel; a coaming is arranged on the bottom wall of the shell at the periphery of the second air hole, and the bottom end of the coaming is used for being inserted into the liquid level of the transformer conservator;

when the electric valve is in a first state, outside air enters the shell through the fourth air hole, the one-way valve and the first air hole in sequence and is exhausted out of the shell through the exhaust channel together with moisture generated by the evaporation of moisture in the drying agent under the action of heat; when the electric valve is in the second state, the external air sequentially enters the oil liquid of the transformer conservator through the air inlet channel, the interior of the shell, the first air hole and the second air hole, and when the temperature of the oil liquid in the transformer conservator rises and expands, redundant gas in the oil liquid is discharged out of the shell through the third air hole and the fourth air hole.

As another embodiment of the application, the top wall of the shell is provided with a valve passage, the valve passage is communicated with the inside of the shell and is respectively communicated with the air inlet passage and the air outlet passage, and the electric valve is arranged in the valve passage.

As another embodiment of the present application, an electric valve includes:

the valve seat is arranged at one end of the valve channel, and an electromagnetic coil is wound on the valve seat and is electrically connected with the controller;

the valve rod is arranged in the valve channel along the axial direction of the valve channel, one end of the valve rod is connected with the valve seat in a sliding mode, the magnetic core is arranged at the end, the valve core is arranged in the middle of the valve rod, the elastic element is arranged at the other end of the valve rod, and the elastic element is connected with one end, away from the valve seat, of the valve channel;

when the valve is in the first state, the electromagnetic coil is electrified to adsorb the magnetic core, the valve rod is driven to slide towards the direction close to the valve seat, and then the valve core is driven to open the exhaust channel and block the air inlet channel; when the valve is in the second state, the electromagnetic coil is powered off, and the valve rod slides in the direction away from the valve seat under the action of the elastic tension of the elastic element, so that the valve core is driven to open the air inlet channel and block the exhaust channel.

As another embodiment of the present application, a negative pressure fan is disposed on the exhaust passage, the negative pressure fan is electrically connected to the controller, and the negative pressure fan is turned on in the first state; in the second state, the negative pressure fan is turned off.

As another embodiment of this application, the casing is inside to be equipped with the silica gel glass barrel, and the both ends of silica gel glass barrel are connected with the interior roof and the interior diapire sealing of casing respectively, and the silica gel chamber is enclosed into with the interior roof and the interior diapire of casing to the silica gel glass barrel jointly, is used for filling the drier in the silica gel chamber.

As another embodiment of the present application, an electric heating element includes:

the supporting seat is arranged in the silica gel chamber and is provided with a net-shaped interlayer positioned in the middle of the silica gel chamber, the top surface of the net-shaped interlayer and the inner wall of the silica gel chamber enclose a first cavity, and the bottom surface of the net-shaped interlayer and the inner wall of the silica gel chamber enclose a second cavity;

the first heating element is arranged on the supporting seat, is positioned in the first cavity, is used for heating the drying agent in the first cavity and is electrically connected with the controller;

the second heating element is arranged on the supporting seat, is positioned in the second cavity, is used for heating the drying agent in the second cavity and is electrically connected with the controller.

As another embodiment of the application, a first humidity sensor and a first temperature sensor which are positioned in the first cavity are arranged on the supporting seat, and the first humidity sensor and the first temperature sensor are respectively used for being electrically connected with the controller; still be equipped with second humidity transducer and the second temperature sensor who is located the second cavity on the supporting seat, second humidity transducer, second temperature sensor are used for being connected with the controller electricity respectively.

As another embodiment of the present application, a stirring mechanism extending into the silica gel chamber is connected to the housing, the stirring mechanism is electrically connected to the controller, and the stirring mechanism is provided with a first stirring rake for stirring the drying agent in the first chamber and a second stirring rake for stirring the drying agent in the second chamber.

As another embodiment of the present application, the stirring mechanism includes:

the driving piece is fixedly connected to the shell and is electrically connected with the controller;

the bottom end of the rotating shaft is rotatably connected to the inner bottom wall of the shell, the top end of the rotating shaft is rotatably connected to the inner top wall of the shell, and the top end of the rotating shaft is used for being connected with the output end of the driving piece;

the first stirring rake and the second stirring rake are connected to the rotating shaft at intervals along the axial direction of the rotating shaft and respectively rotate around the rotating shaft.

The respirator for the transformer provided by the invention has the beneficial effects that: compared with the prior art, the respirator for the transformer has the advantages that when the drying agent filled in the shell is in a normal dry state, the controller controls the electric valve to be kept in the second state, when the oil temperature in the transformer is lowered to suck air, the outside air enters the shell from the air inlet channel, the drying agent is used for absorbing moisture in the air to obtain dry air, the dry air enters the transformer conservator through the breathing channel, when the oil temperature of the transformer is raised to exhale, the redundant air in the transformer conservator is exhausted from the breathing channel arranged on the bottom wall of the shell, so that the transformer breathes the dry air, and the phenomenon that the moisture in the outside air enters the transformer conservator to cause the oil to be damp and deteriorate is avoided;

when the desiccant filled in the shell absorbs more moisture of outside air and reaches a saturation state, the controller controls the electric valve to be switched to a first state, the electric valve is enabled to close the air inlet channel and open the air outlet channel, then the electric heating element is controlled to start working, the electric heating element heats the desiccant to enable the temperature of the desiccant to rise, so that the moisture absorbed by the desiccant is vaporized, at the moment, the outside air directly enters the shell from the breathing channel on the bottom wall of the shell and drives water vapor to be discharged out of the shell from the air outlet channel together until the moisture in the desiccant is completely discharged and the water absorption capacity is recovered, then the electric heating element is turned off, and after the electric valve is switched to a second state again, the respirator starts to work normally;

open or close inlet channel or exhaust passage on the casing through controller control motorised valve to can realize that the respirator switches between normal operating condition and the state that heats the dehumidification to the drier, can resume its water absorption performance fast through heating dehumidification after the drier became invalid, need not to dismantle the casing and change the drier, it is little to the normal work influence of transformer, thereby can improve the life of drier, reduce the waste of manpower and goods and materials.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a breather for a transformer according to an embodiment of the present invention;

FIG. 2 is a schematic view of a portion of the enlarged structure at A in FIG. 1;

FIG. 3 is a schematic view of a portion of the enlarged structure at B in FIG. 1;

fig. 4 is a schematic block diagram of an electrical connection of a transformer according to an embodiment of the present invention.

In the figure: 100. a housing; 101. a breathing passage; 1011. a first air hole; 1012. a second air hole; 1013. a third air hole; 1014. a fourth air hole; 1015. a one-way valve; 102. an exhaust passage; 103. an air intake passage; 104. enclosing plates; 105. a valve way; 200. a desiccant; 201. a first chamber; 202. a second chamber; 300. an electric heating element; 301. a supporting seat; 302. a mesh interlayer; 303. a first heating member; 304. a second heating member; 305. a first humidity sensor; 306. a second humidity sensor; 307. a first temperature sensor; 308. a second temperature sensor; 400. an electrically operated valve; 401. a valve seat; 402. a valve stem; 4021. a magnetic core; 4022. a valve core; 4023. an elastic element; 500. a controller; 600. a silica gel glass cylinder; 700. a negative pressure fan; 800. a stirring mechanism; 801. a drive member; 802. a rotating shaft; 803. a first rabble; 804. a second rabble; 900. transformer conservator.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1 and 4 together, a description will now be given of a breather for a transformer according to the present invention. The breather for the transformer comprises a shell 100, an electric heating element 300, an electric valve 400 and a controller 500; wherein, the interior of the casing 100 is used for filling the desiccant 200; the bottom end of the shell 100 is used for being connected with the transformer conservator 900, and the bottom wall of the shell is provided with a breathing channel 101 for communicating the interior of the transformer conservator 900, the interior of the shell 100 and the outside; the top wall of the housing 100 is provided with an intake passage 103 and an exhaust passage 102 for communicating with the outside, respectively; the electric heating member 300 is provided inside the casing 100 for heating the drying agent 200; the electric valve 400 is disposed on the top wall of the housing 100, and has a first state of closing the intake passage 103 and opening the exhaust passage 102, and a second state of opening the intake passage 103 and closing the exhaust passage 102; the controller 500 is disposed on the outer wall of the housing 100 and electrically connected to the electric heater 300 and the electric valve 400, respectively.

It should be noted that, the desiccant 200 is allochroic silicagel, the degree of moisture of which can be judged according to the color change condition, and the allochroic silicagel can recover the water absorption capacity after being dried and dehumidified.

In addition, the breathing principle of the transformer is that the principle of expansion with heat and contraction with cold of oil in the transformer conservator 900 is utilized, the oil in the transformer conservator 900 is used as a medium for cooling the transformer, when the transformer has large working load and generates more heat, the temperature of the oil in the transformer conservator 900 rises along with the temperature of the oil, so that the volume of the oil expands to extrude and discharge redundant gas in the transformer conservator 900, when the working load of the transformer is reduced and the heat generation amount is small, the temperature of the oil in the transformer conservator 900 falls along with the temperature of the oil, so that the volume of the oil contracts to generate negative pressure in the transformer conservator 900, and outside air can be sucked into the transformer conservator 900 under the action of the negative pressure.

The working mode of the respirator for the transformer provided by the invention is as follows: when the drying agent 200 filled in the casing 100 is in a normal dry state (blue), the controller 500 controls the electric valve 400 to be kept in the second state, the electric valve 400 closes the exhaust channel 102 and opens the air suction channel, the oil temperature in the transformer conservator 900 is reduced, when the transformer sucks air, the outside air enters the casing 100 from the air inlet channel 103, the drying agent 200 is used for absorbing moisture in the air to obtain dry air, then the dry air enters the transformer conservator 900 through the breathing channel 101, the oil temperature in the transformer conservator 900 is increased, and when the transformer exhales air, redundant air in the transformer conservator 900 is discharged through the breathing channel 101 arranged on the bottom wall of the casing 100, so that the transformer breathes the dry air, and the phenomenon that the moisture in the outside air enters the transformer conservator 900 to cause the oil to be damp and go bad is avoided;

when the desiccant 200 filled in the casing 100 absorbs more moisture of the external air and reaches a saturation state (becomes red) and loses water absorption performance, the controller 500 controls the electric valve 400 to switch to the first state, so that the electric valve 400 closes the air inlet channel 103 and opens the air outlet channel 102, then controls the electric heating element 300 to start working, the electric heating element 300 heats the desiccant 200 to raise the temperature of the desiccant 200, so that the moisture absorbed by the desiccant 200 is vaporized (steam is formed), the moisture inevitably rises in the casing 100 due to high temperature of the moisture, and enters the air outlet channel 102, and air needs to be supplemented in the casing 100 to balance the air pressure, so that the external air directly enters the casing 100 from the breathing channel 101 at the bottom wall of the casing 100, thereby forming a gas circulation path through which the external air directly enters the casing 100 from the breathing channel 101, enters the air outlet channel 102 together with the moisture in the casing 100 and is exhausted outside the casing 100, the water absorption capacity is recovered (changed into blue) after the moisture in the drying agent 200 is exhausted, then the electric heating element 300 is closed, the electric valve 400 is switched to the second state again, and the respirator starts to work normally.

Compared with the prior art, the breather for the transformer is characterized in that the shell 100 is provided with the air inlet passage 103 and the air outlet passage 102 which can be opened or closed through the electric valve 400, the controller 500 controls the electric valve 400 to switch the electric valve 400 between the second state and the first state according to the actual moisture level of the desiccant 200, thereby realizing the switching between the normal working state and the state of heating and dehumidifying the drying agent 200, in the event that the desiccant 200 fails due to severe moisture, by switching the electronic valve 400 to the first state, then the electric heating element 300 is started to heat and dehumidify the desiccant 200, so that the water absorption performance of the desiccant 200 can be quickly recovered, the desiccant 200 is not required to be replaced again after the shell 100 is disassembled, the influence on the normal work of the transformer is small, so that the service life of the drying agent 200 can be prolonged, and the waste of manpower and materials is reduced.

As an embodiment of the breathing apparatus for the transformer according to the present invention, referring to fig. 1 and fig. 2, a first air hole 1011 communicating with the inside of the housing 100, a second air hole 1012 and a third air hole 1013 communicating with the inside of the transformer conservator 900, and a fourth air hole 1014 communicating with the outside are disposed on the breathing passage 101, and a check valve 1015 is disposed between the second air hole 1012 and the third air hole 1013 in the breathing passage 101; a surrounding plate 104 is arranged on the bottom wall of the shell 100 at the periphery of the second air hole 1012, and the bottom end of the surrounding plate 104 is used for being inserted into the liquid level of the transformer conservator 900;

when the electric valve 400 is in the first state, the external air sequentially enters the interior of the housing 100 through the fourth air hole 1014, the one-way valve 1015 and the first air hole 1011, and is exhausted out of the housing 100 through the exhaust passage 102 together with the moisture generated by the evaporation of the moisture in the desiccant 200 due to heating; when the electric valve 400 is in the second state, the external air sequentially enters the oil in the transformer conservator 900 through the air inlet passage 103, the interior of the housing 100, the first air hole 1011 and the second air hole 1012, and when the temperature of the oil in the transformer conservator 900 rises and expands, the redundant gas in the oil is discharged out of the housing 100 through the third air hole 1013 and the fourth air hole 1014.

It should be noted that the check valve 1015 functions to allow gas to flow through the check valve 1015 from the third gas hole 1013 position to the second gas hole 1012 position in the breathing passage 101, but gas cannot flow directly through the check valve 1015 from the second gas hole 1012 position to the third gas hole 1013 position in the breathing passage 101.

When the electric valve 400 is in the first state, the air inlet channel 103 is closed, the air outlet channel 102 is opened, so that the external air can directly pass through the check valve 1015 after entering the breathing channel 101 through the fourth air hole 1014, further enter the interior of the housing 100 through the first air hole 1011, and is exhausted through the air outlet channel 102 after passing through the interior of the housing 100, and through the air flow path, the steam generated after the moisture in the desiccant 200 is vaporized by heat is brought out of the housing 100 until the desiccant 200 completely recovers the water absorption performance (turns blue), it should be understood that the high-temperature air inevitably flows upwards in the housing 100 due to the high temperature of the steam, so that the air circulation power in the dehumidification process can be provided, so that the external air is sucked into the housing 100 through the breathing channel 101 through the fourth air hole 1014 and is exhausted together with the steam through the air outlet channel 102;

when the electric valve 400 is in the second state, the air inlet channel 103 is opened, the air outlet channel 102 is closed, when the temperature of the oil in the transformer conservator 900 is reduced and air is sucked, the outside air enters the housing 100 through the air inlet channel 103, the air is dried in the housing 100 through the drying agent 200 to absorb moisture in the outside air, and then the formed dry air enters the breathing channel 101 through the first air hole 1011, due to the existence of the check valve 1015, the dry air is discharged out of the breathing channel 101 through the second air hole 1012 and enters the transformer conservator 900, and due to the blocking effect of the coaming 104, the dry air enters the oil, so that the air suction process of the transformer conservator 900 is completed; when the temperature of the oil in the transformer conservator 900 rises and the oil exhales, the gas in the oil is exhausted above the liquid level under pressure, and due to the existence of the drying agent 200 in the housing 100, the passing resistance in the housing 100 is large, so the gas exhausted from the oil inevitably enters the breathing channel 101 through the third air hole 1013 and is exhausted to the outside through the fourth air hole 1014, and the exhalation process of the transformer conservator 900 is completed.

Through set up different gas circulation paths between casing 100 is inside and the external world, thereby realized the normal operating condition of respirator and heated the switching between the dehumidification operating condition to drier 200, make drier 200 in the respirator lose efficacy after getting damp, need not to take the casing 100 apart and change drier 200, can make drier 200 directly heat the dehumidification inside casing 100, can enough improve the maintenance efficiency of respirator, reduce the repairing process of drier 200 and to the influence of transformer normal operating, can also carry out reuse to drier 200, reduce material and material consumption, thereby practice thrift the maintenance cost of transformer.

Referring to fig. 1 and 3, as an embodiment of the present invention, a valve duct 105 is disposed on a top wall of the housing 100, the valve duct 105 is communicated with an interior of the housing 100 and is respectively communicated with the intake passage 103 and the exhaust passage 102, and the electric valve 400 is disposed in the valve duct 105.

The electric valve 400 acts in the valve passage 105, so that the air inlet passage 103 is blocked and the air outlet passage 102 is opened, or the air inlet passage 103 is opened and the air outlet passage 102 is blocked, the structure is compact, the occupied space of the respirator is small, and the state switching of the electric valve 400 is convenient and reliable.

Specifically, referring to fig. 3, the electric valve 400 includes a valve seat 401 and a valve stem 402; the valve seat 401 is arranged at one end of the valve channel 105, and an electromagnetic coil is wound on the valve seat 401 and is electrically connected with the controller 500; the valve rod 402 is arranged in the valve channel 105 along the axial direction of the valve channel 105, one end of the valve rod is connected with the valve seat 401 in a sliding mode, the magnetic core 4021 is arranged at the end, the valve core 4022 is arranged in the middle of the valve rod, the elastic element 4023 is arranged at the other end of the valve rod, and the elastic element 4023 is connected with one end, far away from the valve seat 401, of the valve channel 105; when the valve is in the first state, the electromagnetic coil is electrified to adsorb the magnetic core 4021, so as to drive the valve rod 402 to slide towards the direction close to the valve seat 401, further drive the valve core 4022 to open the exhaust channel 102 and block the air inlet channel 103; in the second state, the electromagnetic coil is de-energized, and the valve rod 402 slides in a direction away from the valve seat 401 under the action of the elastic tension of the elastic element 4023, so as to drive the valve core 4022 to open the air inlet passage 103 and close the air outlet passage 102.

Because the respirator is in a normal working state most of the time, only when the drying agent 200 is affected with damp and fails (becomes red), dehumidification is needed, so that the electric valve 400 is designed to be in a second state, the electromagnetic coil is powered off, the valve rod 402 is driven by the elastic tension of the elastic element 4023, and the valve core 4022 is further driven to keep a blocking state with the exhaust passage 102, on one hand, the power-on working time of the electromagnetic coil can be reduced, the electric energy is saved, on the other hand, the second state of the electric valve 400 can be ensured to be stably kept, and the normal working of the respirator is ensured to be stable and reliable;

when the desiccant 200 needs to be dehumidified, the electromagnetic coil is energized to generate a magnetic field, so that the magnetic core 4021 can move towards the magnetic field (in a direction close to the valve seat 401), the valve rod 402 is further driven to slide to the position where the valve core 4022 plugs the air inlet channel 103, and when the electromagnetic coil is continuously energized, the valve core 4022 can keep in a plugging state with the air inlet channel 103, of course, the exhaust channel 102 can be opened naturally after the position of the valve core 4022 moves, and then the electric heating element 300 is started to heat and dehumidify the desiccant 200.

As a specific implementation manner of the embodiment of the present invention, referring to fig. 1, a negative pressure fan 700 is disposed on the exhaust channel 102, the negative pressure fan 700 is electrically connected to the controller 500, and in a first state, the negative pressure fan 700 is turned on; in the second state, the negative pressure fan 700 is turned off.

When dehumidification is carried out, because the air current is got into casing 100 by breathing passageway 101 and is discharged by exhaust passage 102 again, through set up negative pressure fan 700 on exhaust passage 102, can produce the negative pressure in exhaust passage 102 after opening negative pressure fan 700 during dehumidification to take out the steam that produces after the gas in casing 100 jointly with moisture vaporization fast together, thereby improve dehumidification efficiency, of course, when normal breathing is worked, close negative pressure fan 700, in order to save the electric energy.

Referring to fig. 1, a silica gel glass cylinder 600 is disposed inside the casing 100, two ends of the silica gel glass cylinder 600 are respectively connected to the inner top wall and the inner bottom wall of the casing 100 in a sealing manner, the silica gel glass cylinder 600 and the inner top wall and the inner bottom wall of the casing 100 together define a silica gel chamber, and the drying agent 200 is filled in the silica gel chamber.

Silica gel glass is transparent material, high temperature resistant has, corrosion resisting property, set up silica gel glass barrel 600 through at casing 100 internal seal, on the one hand can avoid external humid gas to contact casing 100 inner wall and corrode casing 100, improve the life of respirator, on the other hand can make the indoor drier 200 state of silica gel directly perceived visible, thereby avoid getting into the inside phenomenon of transformer because of unable timely discovery drier 200 wets the moist air that the inefficacy arouses, thereby avoid transformer conservator 900 inside fluid to wet rotten, ensure transformer operation safety and stability.

As an embodiment of the present invention, referring to fig. 1 and 4, an electric heating element 300 includes a supporting base 301, a first heating element 303 and a second heating element 304; the supporting seat 301 is arranged in the silica gel chamber, a mesh-shaped interlayer 302 is arranged in the middle of the silica gel chamber, the top surface of the mesh-shaped interlayer 302 and the inner wall of the silica gel chamber form a first chamber 201, and the bottom surface of the mesh-shaped interlayer 302 and the inner wall of the silica gel chamber form a second chamber 202; the first heating element 303 is arranged on the supporting base 301, is positioned in the first chamber 201, is used for heating the drying agent 200 in the first chamber 201, and is electrically connected with the controller 500; the second heating element 304 is disposed on the supporting base 301 and located in the second chamber 202, for heating the drying agent 200 in the second chamber 202, and for electrically connecting with the controller 500.

The drying agent 200 chamber of the respirator is divided into an upper first chamber 201 and a lower second chamber 202 by the mesh interlayer 302 arranged on the supporting seat 301, the mesh interlayer 302 can ensure smooth air circulation between the first chamber 201 and the second chamber 202, when the transformer inhales, external air enters the transformer conservator 900 after being dehumidified twice by the drying agents 200 in the first chamber 201 and the second chamber 202 in sequence, the oil liquid in the transformer conservator 900 is prevented from being affected with damp, when the drying agents 200 in the first chamber 201 and/or the second chamber 202 fail due to water absorption and damp, the first heating element 303 and/or the second heating element 304 are/is started to heat and dry the drying agent 200 in the first chamber 201 and/or the drying agent 200 in the second chamber 202, and the drying agent 200 chamber is divided into an upper chamber and a lower chamber by the mesh interlayer 302, and each chamber is internally provided with a heating element, therefore, the distance between the drying agent 200 and a heat source is reduced, all the drying agents 200 can be heated relatively uniformly, the heating effect on the drying agents 200 is improved, moisture in the drying agents 200 is heated and evaporated rapidly and is discharged out of the drying agents 200 along with the exhalation process of the transformer, the gas dehumidification function of the respirator is recovered rapidly, and the operation safety and stability of the transformer are ensured.

As a specific implementation manner of the embodiment of the present invention, please refer to fig. 1 and fig. 4, a first humidity sensor 305 and a first temperature sensor 307 located in the first chamber 201 are disposed on the supporting base 301, and the first humidity sensor 305 and the first temperature sensor 307 are respectively used for electrically connecting with the controller 500; the supporting base 301 is further provided with a second humidity sensor 306 and a second temperature sensor 308 which are located in the second chamber 202, and the second humidity sensor 306 and the second temperature sensor 308 are respectively used for being electrically connected with the controller 500.

Because the color of the desiccant 200 is judged by the maintenance personnel, so as to judge that the reliability of the moisture condition of the desiccant 200 is poor, if the maintenance personnel is careless or overhauled for a long time, the desiccant 200 cannot be found in time after being wetted, so that moist gas is sucked into the transformer, and further the problem of transformer oil moisture deterioration is caused, in this embodiment, the humidity of the desiccant 200 in the first chamber 201 and the second chamber 202 is detected in real time by the first humidity sensor 305 and the second humidity sensor 306, respectively, so as to find the moisture condition of the desiccant 200 in time, when the detection value of the first humidity sensor 305 and/or the second humidity sensor 306 exceeds the set range, the controller 500 controls the switching state of the electric valve 400, and starts the first heating element 303 and/or the second heating element 304 to heat and dehumidify the desiccant 200, the desiccant 200 can be timely discovered and timely dehumidified after being wetted, the normal work of the respirator is guaranteed, and the influence on the normal work of the transformer is avoided.

In addition, the first temperature sensor 307 and the second temperature sensor 308 are arranged to detect the heating temperatures of the drying agents 200 in the first chamber 201 and the second chamber 202 respectively during heating and dehumidification, when the detected temperatures exceed the set upper limit value of the controller 500 (the vaporization temperature of moisture is one hundred degrees centigrade, which can be set to be about one hundred and ten degrees centigrade for increasing the vaporization speed), the first heating element 303 and/or the second heating element 304 are closed to avoid the damage to the service life of the drying agents 200 caused by the overhigh heating temperature, and when the temperatures drop below the set lower line value (about one hundred degrees centigrade) of the controller 500, the first heating element 303 and/or the second heating element 304 are opened again for heating, so that the damage to the service life of the drying agents 200 caused by overhigh silica gel temperature due to continuous heating is avoided, and electric energy can be saved.

Referring to fig. 1, as a specific implementation manner of the embodiment of the present invention, a stirring mechanism 800 extending into the silica gel chamber is connected to the housing 100, the stirring mechanism 800 is electrically connected to the controller 500, and a first stirring rake 803 for stirring the drying agent 200 in the first chamber 201 and a second stirring rake 804 for stirring the drying agent 200 in the second chamber 202 are disposed on the stirring mechanism 800.

When the drying agent 200 is heated and dehumidified, the stirring mechanism 800 is started, so that the first stirring rake 803 and the second stirring rake 804 respectively stir the drying agent 200 in the first cavity 201 and the second cavity 202, thereby increasing the heat transfer speed between the drying agents 200, enabling the drying agent 200 to be uniformly heated, avoiding the situation that the drying agent 200 far away from the heat source cannot be thoroughly dried due to insufficient heating, improving the heating and dehumidifying efficiency, and enhancing the heating and dehumidifying effect.

In the present embodiment, please refer to fig. 1, the stirring mechanism 800 includes a driving member 801 and a rotating shaft 802; the driving member 801 is fixedly connected to the housing 100 and electrically connected to the controller 500; the bottom end of the rotating shaft 802 is rotatably connected to the inner bottom wall of the housing 100, the top end of the rotating shaft 802 is rotatably connected to the inner top wall of the housing 100, and the top end of the rotating shaft is used for being connected with the output end of the driving member 801; the first rabble blade 803 and the second rabble blade 804 are connected to the rotating shaft 802 at intervals along the axial direction of the rotating shaft 802, and rotate around the rotating shaft 802.

The first rabble blade 803 and the second rabble blade 804 are connected to the rotating shaft 802 at intervals along the axial direction of the rotating shaft 802 and rotate under the driving of the driving member 801, the rotation tracks of the first rabble blade 803 and the second rabble blade 804 both rotate around the rotating shaft 802, of course, the rotation radius of the first rabble blade 803 and the second rabble blade 804 should match the space size in the housing 100 to avoid the interference between the rotation motion and the interior of the housing 100, and the rotation motion process is respectively based on the maximum stirring of the drying agents 200 in the first chamber 201 and the second chamber 202, so that the drying agents 200 in the first chamber 201 and the second chamber 202 can be uniformly heated during continuous stirring, the condition that the dehumidification effect of the drying agents 200 is poor due to insufficient heating of the drying agents 200 far away from the first heating member 303 and the second heating member 304 can be avoided, and the heating and drying speed of the drying agents 200 can be increased, the influence of the heating and dehumidifying process on the normal operation time of the transformer is reduced.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A respirator for a transformer, comprising:

the electric valve is arranged on the top wall of the shell and has a first state of closing the air inlet channel and opening the exhaust channel and a second state of opening the air inlet channel and closing the exhaust channel;

the controller is arranged on the outer wall of the shell and is electrically connected with the electric heating element and the electric valve respectively;

the breathing passage is provided with a first air hole communicated with the inside of the shell, a second air hole and a third air hole which are used for being communicated with the inside of the transformer conservator, and a fourth air hole which is used for being communicated with the outside, and a one-way valve is arranged between the second air hole and the third air hole in the breathing passage; a coaming is arranged on the bottom wall of the shell and at the periphery of the second air hole, and the bottom end of the coaming is used for being inserted into the liquid level of the transformer conservator;

when the electric valve is in the first state, outside air enters the shell through the fourth air hole, the one-way valve and the first air hole in sequence, and is exhausted out of the shell through the exhaust channel together with moisture generated by evaporation of heated moisture in the drying agent; when the electric valve is in the second state, the external air sequentially passes through the air inlet channel, the inside of the shell, the first air hole and the second air hole to enter the oil of the transformer conservator, and when the temperature of the oil in the transformer conservator rises and expands, redundant gas in the oil is discharged out of the shell through the third air hole and the fourth air hole.

2. The respirator for a transformer as claimed in claim 1, wherein the top wall of the housing is provided with a valve passage, the valve passage communicates with the interior of the housing and with the intake passage and the exhaust passage, respectively, and the electric valve is provided in the valve passage.

3. A respirator for a transformer according to claim 2, wherein said electrically operated valve comprises:

the valve seat is arranged at one end of the valve channel, an electromagnetic coil is wound on the valve seat, and the electromagnetic coil is electrically connected with the controller;

the valve rod is arranged in the valve channel along the axial direction of the valve channel, one end of the valve rod is in sliding connection with the valve seat, the end of the valve rod is provided with a magnetic core, the middle part of the valve rod is provided with a valve core, the other end of the valve rod is provided with an elastic element, and the elastic element is connected with one end, far away from the valve seat, of the valve channel;

when the valve core is in the first state, the electromagnetic coil is electrified to adsorb the magnetic core, the valve rod is driven to slide towards the direction close to the valve seat, and then the valve core is driven to open the exhaust channel and block the air inlet channel; when the valve core is in the second state, the electromagnetic coil is powered off, and the valve rod slides in the direction far away from the valve seat under the action of the elastic tension of the elastic element, so that the valve core is driven to open the air inlet channel and close the air outlet channel.

4. The respirator for the transformer of claim 3, wherein a negative pressure fan is arranged on the exhaust passage, the negative pressure fan is electrically connected with the controller, and the negative pressure fan is turned on in the first state; and in the second state, the negative pressure fan is closed.

5. The respirator for the transformer as claimed in claim 1, wherein a silica gel glass cylinder is arranged inside the shell, two ends of the silica gel glass cylinder are respectively connected with the inner top wall and the inner bottom wall of the shell in a sealing manner, the silica gel glass cylinder and the inner top wall and the inner bottom wall of the shell together enclose a silica gel chamber, and the silica gel chamber is filled with the drying agent.

6. The breather of claim 5, wherein the electrical heating element comprises:

and the second heating element is arranged on the supporting seat, is positioned in the second cavity, is used for heating the drying agent in the second cavity, and is electrically connected with the controller.

7. The respirator for the transformer of claim 6, wherein the supporting base is provided with a first humidity sensor and a first temperature sensor which are positioned in the first chamber, and the first humidity sensor and the first temperature sensor are respectively used for being electrically connected with the controller; the supporting seat is further provided with a second humidity sensor and a second temperature sensor which are located in the second cavity, and the second humidity sensor and the second temperature sensor are respectively used for being electrically connected with the controller.

8. The respirator for a transformer as claimed in claim 6, wherein a stirring mechanism extending into the silica gel chamber is connected to the housing, the stirring mechanism is electrically connected to the controller, and the stirring mechanism is provided with a first stirring rake for stirring the drying agent in the first chamber and a second stirring rake for stirring the drying agent in the second chamber.

9. The respirator for a transformer of claim 8, wherein the agitation mechanism comprises: