CN113847457B - Magnetic liquid pressure relief valve - Google Patents

Magnetic liquid pressure relief valve Download PDF

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Publication number
CN113847457B
CN113847457B CN202111074687.XA CN202111074687A CN113847457B CN 113847457 B CN113847457 B CN 113847457B CN 202111074687 A CN202111074687 A CN 202111074687A CN 113847457 B CN113847457 B CN 113847457B
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China
Prior art keywords
shaft
shell
magnetic liquid
magnetic
relief valve
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Application number
CN202111074687.XA
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Chinese (zh)
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CN113847457A (en
Inventor
李德才
赵云翔
杨晟
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Tsinghua University
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Tsinghua University
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Priority to CN202111074687.XA priority Critical patent/CN113847457B/en
Publication of CN113847457A publication Critical patent/CN113847457A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K13/00—Other constructional types of cut-off apparatus; Arrangements for cutting-off
    • F16K13/08—Arrangements for cutting-off not used
    • F16K13/10—Arrangements for cutting-off not used by means of liquid or granular medium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/164—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side and remaining closed after return of the normal pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K47/00—Means in valves for absorbing fluid energy
    • F16K47/08—Means in valves for absorbing fluid energy for decreasing pressure or noise level and having a throttling member separate from the closure member, e.g. screens, slots, labyrinths
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/08—Means for indicating or recording, e.g. for remote indication
    • G01L19/12—Alarms or signals
    • 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

Abstract

The invention discloses a magnetic liquid pressure release valve which comprises a shell, a pole shoe assembly, a shaft, magnetic liquid and a membrane disc, wherein the shell is provided with an air inlet and an air outlet, the air inlet of the shell is suitable for being communicated with an oil tank, the pole shoe assembly is arranged in the shell, an exhaust channel is arranged in the pole shoe assembly, the shaft penetrates through the exhaust channel, a sealing gap is formed between the outer peripheral wall of the shaft and the inner peripheral wall of the pole shoe assembly, the magnetic liquid is filled in the sealing gap, at least part of the magnetic liquid is positioned between the air inlet and the air outlet so that when the pressure in the oil tank is lower than a preset value, at least part of the magnetic liquid is positioned in the sealing gap, the membrane disc is arranged at one end of the shaft, the membrane disc and the pole shoe assembly are arranged at intervals along the axial direction of the shaft, and the membrane disc can move at a first position and a second position along the axial direction of the shaft. The magnetic liquid pressure release valve has the advantages of simple structure, long service life and the like.

Description

Magnetic liquid pressure relief valve
Technical Field
The invention relates to the technical field of mechanical engineering sealing, in particular to a magnetic liquid pressure release valve.
Background
The pressure relief valve is a pressure relief device widely used in electrical equipment such as liquid or gas insulated transformers, on-load tap changers, high-voltage switches and the like. The pressure relief valve is generally installed at the top of an oil tank of a transformer, the pressure relief valve protects transformer oil from outside air when the transformer works normally, once the transformer has a short-circuit fault, a transformer winding generates electric arcs and sparks to cause the transformer oil to expand and decompose instantly to generate a large amount of gas, so that the pressure in the oil tank is increased rapidly, and the pressure in the oil tank needs to be relieved through the pressure relief valve.
In the related technology, the opening pressure of the external spring type pressure release valve is not adjustable, so that misoperation is easy to occur, the opening stroke is limited, and the spring recovery capability is easy to lose efficacy due to larger instantaneous pressure impact.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the embodiment of the invention provides the magnetic liquid pressure release valve which is simple in structure, long in service life and low in price.
The magnetic liquid pressure relief valve according to an embodiment of the present invention comprises a housing having an air inlet and an air outlet, the air inlet of the housing adapted to communicate with an oil tank; the pole shoe component is arranged in the shell, and an exhaust channel is arranged in the pole shoe component; a shaft extending through the exhaust passage, a sealed gap being formed between an outer peripheral wall of the shaft and an inner peripheral wall of the pole shoe member; magnetic liquid, wherein at least part of the magnetic liquid is positioned between the air inlet and the air outlet, so that when the pressure in the oil tank is lower than a preset value, at least part of the magnetic liquid is positioned in the sealing gap so as to seal and block the air exhaust channel, and when the pressure in the oil tank is higher than the preset value, at least part of the magnetic liquid can be exhausted out of the sealing gap so as to communicate the air outlet and the air inlet; the membrane disc is arranged at one end of the shaft, the membrane disc and the pole shoe component are arranged at intervals along the axial direction of the shaft, the membrane disc can move at a first position and a second position along the axial direction of the shaft, the membrane disc covers the air inlet at the first position, and the membrane disc is separated from the air inlet at the second position.
According to the magnetic liquid pressure release valve provided by the embodiment of the invention, the magnetic liquid blocks the sealing gap, when the pressure in the oil tank rises, the magnetic liquid pressure release valve communicates the air inlet with the air outlet, so that the pressure in the oil tank is released, and when the pressure in the oil tank falls, the magnetic liquid pressure release valve disconnects the air inlet and the air outlet to block the oil tank.
In some embodiments, the magnetic fluid pressure relief valve further comprises a guide member disposed within the housing, the guide member being provided with a guide slot, the shaft being movably disposed through the guide slot so as to prevent deflection of the shaft.
In some embodiments, the housing includes first and second shells in communication with one another, the first shell being removably disposed on the second shell, the pole shoe members being disposed within the first shell, the second shell being adapted to be connected to the fuel tank.
In some embodiments, the magnetic liquid pressure relief valve further comprises a seal ring disposed between the first and second shells to prevent gas from leaking between the first and second shells.
In some embodiments, the magnetic liquid pressure relief valve further comprises a membrane disc, the shaft being of a hollow structure closed at both ends so as to reduce the weight of the shaft.
In some embodiments, the air outlet is provided on an outer peripheral surface of the housing and/or the air outlet is provided at a free end of the housing.
In some embodiments, the inner circumferential surface of the housing is provided with a positioning portion extending inward in the axial radial direction, and the pole shoe members are provided on the positioning portion.
In some embodiments, the pole shoe assembly comprises: the pole shoes are arranged in the shell, the shaft is sleeved with the pole shoes, the inner circumferential surfaces of the pole shoes and the outer circumferential surface of the shaft are arranged at intervals along the radial direction of the shaft, and the magnetic liquid is filled in the inner circumferential surfaces of the pole shoes and the outer circumferential surface of the shaft; the magnetic source component can generate a magnetic field, is arranged in the shell and sleeved on the shaft, and is positioned between the adjacent pole shoes.
In some embodiments, the magnetic fluid pressure relief valve further comprises an alarm at the free end of the shaft to generate an alarm when the tank pressure is too high.
Drawings
Fig. 1 is a schematic structural view of a magnetic liquid pressure relief valve according to an embodiment of the present invention.
A magnetic liquid pressure release valve 100;
a housing 1; a first case 11; a second shell 12; an air outlet 13; an air inlet 14; a positioning portion 15; a pole shoe assembly 2; a pole piece 21; a magnetic source part 22; an exhaust passage 23; a shaft 3; a magnetic liquid 4; a guide 5; a seal ring 6; a membrane disc 7; and an end cap 8.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A magnetic fluid pressure relief valve according to an embodiment of the present invention will be described with reference to fig. 1.
As shown in fig. 1, a magnetic fluid pressure relief valve according to an embodiment of the present invention includes a housing 1, a pole piece assembly 2, a shaft 3, and a magnetic fluid 4.
The housing 1 has an air inlet 14 and an air outlet 13, the air inlet 14 of the housing 1 being adapted to communicate with a fuel tank. Specifically, the housing 1 is provided on an oil tank, the air outlet 13 of the housing 1 communicates with the oil tank (not shown in the figure), and the air inlet 14 of the housing 1 and the air outlet 13 of the housing 1 are provided at an interval in the up-down direction.
The pole shoe component 2 is arranged in the shell 1, and an exhaust channel 23 is arranged in the pole shoe component 2. Specifically, the pole shoe member 2 is provided with an exhaust passage 23 which penetrates the pole shoe member 2 in the up-down direction, and gas in the oil tank can be exhausted from the exhaust passage 23.
The shaft 3 penetrates through the exhaust channel 23, and a sealing gap is formed between the outer circumferential wall of the shaft 3 and the inner circumferential wall of the pole piece 21 assembly 2.
The magnetic liquid 4 is filled in a sealing gap (not shown in the figures), at least part of the magnetic liquid 4 is positioned between the air inlet 14 and the air outlet 13, so that when the pressure in the oil tank is lower than a preset value, at least part of the magnetic liquid 4 is positioned in the sealing gap to seal off the air exhaust channel 23, and when the pressure in the oil tank is higher than the preset value, at least part of the magnetic liquid 4 can be discharged out of the sealing gap so that the air exhaust channel 23 is communicated with the air outlet 13 and the air inlet 14.
Specifically, as shown in fig. 1, the magnetic liquid 4 is filled in a sealed gap between the outer peripheral wall of the shaft 3 and the inner peripheral wall of the pole piece 21 assembly 2, the magnetic liquid 4 is located between the air inlet 14 and the air outlet 13, the air inlet 14 and the air outlet 13 are blocked and sealed by the magnetic liquid 4, so that the oil tank is sealed, when the pressure in the oil tank is too high, the high-pressure gas in the oil tank extrudes the magnetic liquid 4 through the air inlet 14, the gap is sealed, so that the air inlet 14 and the air outlet 13 are communicated, the high-pressure gas in the oil tank passes through the magnetic liquid pressure release valve oil tank, and when the pressure in the oil tank is recovered to be normal, the magnetic liquid 4 is re-adsorbed in the sealed gap, so that the air inlet 14 and the air outlet 13 are disconnected.
Specifically, the magnetic liquid 4 is filled between the outer circumferential surface of the shaft 3 and the inner circumferential surface of the pole shoe member 2, when the air pressure in the oil tank is low, the shaft 3 is in the first position, the magnetic liquid 4 is adsorbed between the shaft 3 and the pole shoe member 2, when the air pressure in the oil tank is increased, the air pressure pushes the shaft to move upwards to open the air inlet 14, the high-pressure gas in the oil tank is discharged from the air inlet 14, the magnetic liquid 4 is discharged out of the sealing gap, the air inlet 14 and the air outlet are communicated through the air discharge channel 23, the high-pressure gas is discharged, and when the pressure in the oil tank is reduced to a normal value, the magnetic liquid 4 is adsorbed between the shaft 3 and the pole shoe 21 again.
The membrane disc 7 is disposed at one end of the shaft 3, the membrane disc 7 and the pole piece 21 assembly 2 are spaced apart in an axial direction (in an up-and-down direction as shown in fig. 1) of the shaft 3, and the membrane disc 7 is movable along the shaft 3 of the shaft 3 between a first position in which the membrane disc 7 covers the air inlet 14 and a second position in which the membrane disc 7 is separated from the air inlet 14.
Specifically, as shown in fig. 1, the membrane disc 7 may be a rubber disc, the membrane disc 7 is disposed at the lower end of the shaft 3, and in the first position, the membrane disc 7 covers the air inlet 14 to protect the magnetic liquid 4, and in the second position, the membrane disc 7 moves upward and is spaced apart from the air outlet 14.
According to the magnetic liquid pressure relief valve 100 of the embodiment of the invention, through the arrangement of the air inlet 14, the air outlet 13, the pole piece assembly 2 and the magnetic liquid 4, when the pressure in the oil tank is low, the magnetic liquid 4 is stably adsorbed between the outer circumferential surface of the shaft 3 and the inner circumferential surface of the pole piece 21 to seal the air outlet 23, so that the air inlet 14 is not communicated with the air outlet 13, the magnetic liquid pressure relief valve 100 plays a role of sealing the oil tank, when the pressure in the oil tank rises, the air pressure in the oil tank extrudes the magnetic liquid 4 between the outer circumferential surface of the shaft 3 and the inner circumferential surface of the pole piece 21 out of a sealing gap, so that the air inlet 14 is communicated with the air outlet 13 through the air outlet 23, and further the air pressure in the oil tank is sequentially discharged out of the oil tank from the air inlet 14, the air outlet 23 and the air outlet 13, so as to achieve the purpose of pressure reduction, and when the pressure in the oil tank drops to a normal value, the magnetic liquid 4 is re-adsorbed between the outer circumferential surface of the shaft 3 and the inner circumferential surface of the pole piece 21 to play a sealing effect again. Therefore, the trouble of arranging a spring in the pressure release valve is avoided, and the problems that the restoring capacity of the spring is easy to lose efficacy due to larger instantaneous pressure impact and the like are solved.
According to the magnetic liquid pressure relief valve 100 of the embodiment of the invention, by positioning at least part of the magnetic liquid 4 between the air inlet 14 and the air outlet 13, the opening pressure of the magnetic liquid pressure relief valve 100 can be adjusted by adjusting the magnetic liquid 4 between the air outlet 13 and the air inlet 14, and the opening stroke of the magnetic liquid pressure relief valve 100 is increased.
According to the magnetic liquid pressure release valve 100 provided by the embodiment of the invention, through the arrangement of the membrane disc 7, a large amount of oil mist small droplets are sprayed out due to the electrical fault of an oil tank, the oil tank wall and the valve seat are impacted, and the oil mist small droplets can directly impact the utmost point teeth at the lowest side, so that the recovery effect is lost, the membrane disc 7 can be prevented from the phenomenon to a certain extent to protect a fragile structure, and in addition, the membrane disc 7 and the pole shoe 21 assembly 2 are arranged at intervals along the axial direction of the shaft 3, so that a space is reserved between the membrane disc 7 and the pole shoe assembly 2, the impact force can be reduced, the impact force on the magnetic liquid 7 is reduced, and the service life of the magnetic liquid pressure release valve 100 is further prolonged.
In some embodiments, a guide 5 is further included, the guide 5 being disposed within the housing 1, the guide 5 being provided with a guide slot, the shaft 3 being movably disposed through the guide slot so as to prevent the shaft 3 from deflecting.
Specifically, as shown in fig. 1, the guide 5 is disposed at the upper end of the pole shoe assembly 2, the guide 5 is disposed in the housing 1 and penetrates the shaft 3, the outer circumferential surface of the guide 5 contacts the inner circumferential surface of the housing 1, the inner circumferential surface of the guide 5 and the outer circumferential surface of the shaft 3 are spaced in the inward and outward directions, and the gap between the inner circumferential surface of the guide groove and the outer circumferential surface of the shaft 3 is smaller than the sealing gap, so that the shaft 3 is prevented from deflecting during the up-and-down movement by the guide 5, and the gap between the inner circumferential surface of the guide 5 and the outer circumferential surface of the shaft 3 is smaller than the sealing gap, so that the shaft 3 is prevented from rubbing against the pole shoe 21 in the pole shoe assembly 2 during the movement, thereby prolonging the service life of the pole shoe assembly 2.
In some embodiments, the housing 1 comprises a first shell 11 and a second shell 12 which are communicated with each other, the first shell 11 is detachably arranged on the second shell 12, the pole shoe assembly 2 is arranged in the first shell 11, and the second shell 12 is suitable for being connected with a fuel tank. Specifically, as shown in fig. 1, the first shell 11 is disposed above the second shell 12, the first shell 11 and the second shell 12 are detachably connected by a fastener (not shown), the pole shoe assembly 2 is disposed in the first shell 11, and the second shell 12 is mountable above the oil tank. Thus, when the magnetic liquid 4 in the pole shoe member 2 in the first shell 11 fails, the first shell 11 can be directly replaced, so that the arrangement of the housing 1 is more reasonable.
In some embodiments, magnetic liquid pressure relief valve 100 further comprises a sealing ring 6, sealing ring 6 being disposed between first shell 11 and second shell 12 so as to prevent gas from leaking between first shell 11 and second shell 12. Specifically, as shown in fig. 1, the lower circumferential surface of the first casing 11 or the upper circumferential surface of the second casing 12 is provided with an annular groove, a part of the seal ring 6 is provided in the annular groove, and the other part extends out of the annular groove to be fitted with the first casing 11 or the second casing 12, thereby preventing high-pressure gas from leaking between the first casing 11 and the second casing 12 and ensuring the sealing performance of the magnetic liquid pressure release valve 100.
It is understood that the first and second cases 11 and 12 may also be integrally formed, and the fasteners may be bolts or screws.
In some embodiments, the shaft 3 is a hollow structure closed at both ends in order to reduce the weight of the shaft 3. This reduces the weight of the shaft 3 to enable the shaft 3 to move in the vertical direction.
In some embodiments, the inner circumferential surface of the housing 1 is provided with a positioning portion 15 extending inward in the radial direction of the shaft 3, and the pole shoe members 2 are provided on the positioning portion 15. Specifically, as shown in fig. 1, the inner circumferential surface of the housing 1 has a positioning portion 15 extending inward in the inward and outward directions, the pole shoe members 2 are disposed on the positioning portion 15, and the end cover 8 is disposed above the pole shoe members 2. Thereby, the pole shoe assembly 2 is arranged between the positioning part 15 and the end cover 8, and the pole shoe assembly 2 is prevented from moving in the vertical direction.
In some embodiments, pole piece assembly 2 includes a plurality of pole pieces 21 and a magnetic source member 22.
The plurality of pole shoes 21 are arranged in the shell 1, the plurality of pole shoes 21 are sleeved on the shaft 3, the inner circumferential surfaces of the plurality of pole shoes 21 and the outer circumferential surface of the shaft 3 are arranged at intervals along the radial direction of the shaft 3, and the inner circumferential surfaces of the pole shoes 21 and the outer circumferential surface of the shaft 3 are filled with magnetic liquid 4. The magnetic source part 22 can generate a magnetic field, the magnetic source part 22 is arranged in the shell 1 and sleeved on the shaft 3, and the magnetic source part 22 is positioned between the adjacent pole shoes 21. Therefore, the magnetic source part 22, the pole shoe 21 and the magnetic liquid 4 form a closed magnetic circuit, a non-uniform magnetic field with alternate intensity is generated between the pole shoe 21 and the shaft 3 by the magnetic source part 22, the magnetic liquid 4 is absorbed between the pole teeth of the pole shoe 22 and the shaft 3, and therefore the magnetic liquid 4 is filled in the gap, and the purpose of sealing is achieved.
It can be understood that the pole shoe assembly 2 may also be a plurality of magnetic source components 22, the plurality of magnetic source components 22 are sleeved on the shaft 3, inner circumferential surfaces of the plurality of magnetic source components 22 and an outer circumferential surface of the shaft 3 are arranged at intervals along a radial direction of the shaft 3, the pole shoes 21 are arranged in the housing 1 and sleeved on the shaft 3, the pole shoes 21 are located between adjacent magnetic source components 22, and an inner circumferential surface of the pole shoe 21 and an outer circumferential surface of the shaft 3 are filled with the magnetic liquid 4.
In some embodiments, the air outlet 13 is provided on the outer peripheral surface of the housing 1, and/or the air outlet 13 is provided at the free end of the housing 1. Specifically, the air inlet 14 is disposed at the lower end of the housing 1, and the arrangement of the air outlet 13 can be selected according to actual needs, for example: the air outlet 13 may be provided at the upper end of the casing 1, or the air outlet 13 may be provided on the casing 1, and the magnetic source unit 22 is provided with an air outlet through hole (not shown) communicating with the air outlet 13, so that the high-pressure air is discharged through the air inlet 14, the air outlet through hole and the air outlet 13, respectively. In addition, the number of the air outlets 13 may be plural, for example: the air outlets 13 may be provided at intervals along the outer peripheral side of the housing 1, etc.
In some embodiments, the magnetic source component 22 includes a metal core (not shown) having magnetic permeability and a coil (not shown), and the coil is wound around an outer circumferential side of the metal core. Thus, when the coil is energized, the metal core will be magnetized, so that the magnetic source component 22 will generate a magnetic field, and by adjusting the magnitude of the current, the magnitude of the magnetic field generated by the magnetic source component 22 will be adjusted.
In some embodiments, the magnetic fluid pressure relief valve 100 further comprises an alarm (not shown) provided at the free end of the shaft 3 to alarm in the event of excessive tank pressure. Specifically, the alarm is arranged at the upper end of the shaft 3, when the pressure of the oil tank rises, the shaft moves upwards, and when the alarm senses the upward movement of the shaft, the alarm gives an alarm to remind a user that the pressure of the oil tank is too high.
The transformer according to the embodiment of the present invention includes: a transformer body (not shown), a tank (not shown), and a pressure relief valve.
The transformer body is connected with the oil tank so as to supply oil to the transformer body. Specifically, transformer oil is arranged in the oil tank, so that the core, the shell and the iron core of the transformer body are well insulated, and the transformer is accelerated to cool and extinguish arc during operation.
The magnetic liquid pressure relief valve is any one of the magnetic liquid pressure relief valves in the above embodiments, and an air inlet of the magnetic liquid pressure relief valve is connected with the oil tank.
According to the transformer provided by the embodiment of the invention, the air inlet of the magnetic liquid pressure release valve is connected with the oil tank, when the transformer body works normally, the magnetic liquid pressure release valve protects transformer oil in the oil tank from outside air, once the transformer body has a short-circuit fault, the transformer winding generates electric arcs and sparks to cause the transformer oil to expand and decompose instantaneously to generate a large amount of gas, so that the pressure in the oil tank is increased rapidly, the magnetic liquid pressure release valve is opened, the pressure in the oil tank is effectively reduced, and the oil tank is prevented from being broken and cracked due to overlarge pressure. When the pressure in the oil tank is reduced to a certain value, the magnetic liquid pressure release valve is automatically closed, so that external moisture and impurities are prevented from entering the oil tank.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
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 to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; may be mechanically coupled, may be electrically coupled or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any combination, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise explicitly specified or limited, a first feature may be "on" or "under" a second feature in direct contact with the first and second features, or in indirect contact with the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples" and the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (8)

1. A magnetic fluid pressure relief valve, comprising:
a housing having an air inlet and an air outlet, the air inlet of the housing adapted to communicate with an oil tank;
the pole shoe component is arranged in the shell, and an exhaust channel is arranged in the pole shoe component;
a shaft extending through the exhaust passage, a sealed gap being formed between an outer peripheral wall of the shaft and an inner peripheral wall of the pole shoe member;
the magnetic liquid is filled in the sealing gap, at least part of the magnetic liquid is positioned between the air inlet and the air outlet, so that when the pressure in the oil tank is lower than a preset value, at least part of the magnetic liquid is positioned in the sealing gap so as to seal and block the air exhaust channel, and when the pressure in the oil tank is higher than the preset value, at least part of the magnetic liquid can be discharged out of the sealing gap so as to communicate the air outlet with the air inlet;
a membrane disc disposed at one end of the shaft, the membrane disc and the pole shoe assembly being spaced apart along the axial direction of the shaft, the membrane disc being movable along the axial direction of the shaft between a first position in which the membrane disc covers the air inlet and a second position in which the membrane disc is separated from the air inlet;
the shaft is a hollow structure with two closed ends so as to reduce the weight of the shaft.
2. The magnetic liquid pressure relief valve according to claim 1 further comprising a guide member disposed within said housing, said guide member having a guide slot, said shaft being movably disposed through said guide slot so as to prevent deflection of said shaft.
3. The magnetic fluid pressure relief valve according to claim 1, wherein said housing comprises a first shell and a second shell in communication with each other, said first shell being removably disposed on said second shell, said pole piece member being disposed within said first shell, said second shell being adapted to be connected to said oil tank.
4. The magnetic liquid pressure relief valve according to claim 3, further comprising a sealing ring disposed between said first shell and said second shell so as to prevent gas from leaking between said first shell and said second shell.
5. The magnetic liquid pressure relief valve according to claim 1 wherein said air outlet is provided on an outer peripheral surface of said housing and/or said air outlet is provided at a free end of said housing.
6. The magnetic liquid pressure relief valve according to claim 1 wherein said housing has a locating portion on an inner peripheral surface thereof extending inwardly in a radial direction of said shaft, said pole piece member being provided on said locating portion.
7. The magnetic liquid pressure relief valve according to claim 1, wherein said pole piece assembly comprises:
the pole shoes are arranged in the shell, the shaft is sleeved with the pole shoes, the inner circumferential surfaces of the pole shoes and the outer circumferential surface of the shaft are arranged at intervals along the radial direction of the shaft, and the magnetic liquid is filled in the inner circumferential surfaces of the pole shoes and the outer circumferential surface of the shaft;
the magnetic source component can generate a magnetic field, is arranged in the shell and sleeved on the shaft, and is positioned between the adjacent pole shoes.
8. The magnetic fluid pressure relief valve according to any of claims 1-7 further comprising an alarm disposed at a free end of said shaft to alarm when said tank pressure is too high.
CN202111074687.XA 2021-09-14 2021-09-14 Magnetic liquid pressure relief valve Active CN113847457B (en)

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Application Number Priority Date Filing Date Title
CN202111074687.XA CN113847457B (en) 2021-09-14 2021-09-14 Magnetic liquid pressure relief valve

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CN2193479Y (en) * 1994-03-31 1995-03-29 沈阳变压器研究所技术开发公司 Pressure release valve
CN2403110Y (en) * 1999-11-19 2000-10-25 沈阳变压器研究所组件技术有限公司 Pressure release valve for power transformer
CN112178200B (en) * 2020-09-27 2021-09-24 清华大学 Magnetic liquid sealing device
CN112112973B (en) * 2020-10-30 2021-06-04 清华大学 Combined sealing device of magnetorheological fluid and magnetic liquid
CN112503219A (en) * 2020-12-17 2021-03-16 北京交通大学 Magnetic liquid intelligent safety valve

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