Liquid level meter for offshore wind power transformer

Abstract

The utility model provides a liquid level meter for an offshore wind power transformer, which relates to the technical field of liquid level meters for new energy transformers and comprises a liquid level meter upper seat, a guide pipe, a guide pipe-spiral groove, a floater mechanism, a floater limiting nail, a lower rotating shaft, lower magnetic steel and a microswitch mechanism. According to the device, the liquid level change of oil in the transformer is converted into the rotating motion of the floater mechanism, the lower rotating shaft and the lower magnetic steel are driven to rotate through friction of the rotating motion of the floater mechanism, the upper magnetic steel in the microswitch mechanism is driven to rotate through rotation of the lower magnetic steel, and then the roller pin fixing wheel and the roller pin are driven to rotate. The roller pin rotating around the axis of the roller pin fixing wheel is used for triggering and starting the microswitch, the microswitch is started and connected with external alarm equipment to give an alarm, remote output is achieved, and timely maintenance is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy transformer liquid level meter technical field especially relates to a kind of for new energy offshore wind power transformer liquid level meter. BACKGROUND

[0002] At present, the liquid level change in the inside of the traditional oil-immersed fully-sealed transformer box is triggered as an electrical signal to alarm device, which is called liquid level meter, and the key points of its liquid level protection are: when the oil in the transformer is lack due to long-time operation, the box leaks oil, or gas is generated due to the fault in the transformer, resulting in the decrease of liquid level, half of the float below the liquid level meter is immersed in oil, and the other half is floating above the demarcation line between oil surface and liquid surface, the float drives the magnetic steel inside the liquid level meter to rotate with the rise and fall of oil surface, and when it falls to the low liquid level setting value, the alarm contact sends a signal to prevent the liquid level from continuing to decrease, so that the switch contact, winding coil, and conductive rod in the bushing on the transformer, which need to be cooled and insulated by insulating oil, are exposed to the gas environment, and the normal operation of the transformer is ensured.

[0003] The disadvantages of the traditional pressure relay are:

[0004] 1. With the increasing prices of coal, crude oil and other energy sources, the gradually decreasing available land area, the rapid development of new energy offshore wind power oil-immersed transformer, and the increasing labor cost, the environment of offshore wind power determines that the transformer must be an unattended device, but the existing transformer assembly parts cannot convert the liquid level change into electrical signal quantity for remote output, which is not convenient for timely maintenance.

[0005] 2. At present, most of the liquid level meters used on ordinary transformers are observed through the liquid level meter glass window to determine the liquid level of the transformer by observing the change of red and blue indicating floats or through the dial pointer to determine whether the transformer is short of oil, but the position of offshore wind power transformer is very limited, which is not enough to install the pointer type liquid level meter that occupies a lot of space, and the ordinary pipe type liquid level meter has poor anti-vibration ability, so the working conditions and environment determine that this type of liquid level meter requires compact structure and good anti-vibration ability.

[0006] 3. The alarm contact of the liquid level meter provided by the transformer assembly market is a dry reed contact, which is difficult to provide a conversion contact that meets the insulation and voltage resistance performance requirements of national standards, and most of the liquid level meters on the market are connected to the external lead wire and the internal electrical contact of the liquid level meter by aviation plug leads, and the secondary wiring needs to be connected to the original lead wire, and then wrapped with waterproof insulating tape, which has low IP protection level, and the connection place is easy to be damp or waterlogged after rain or snow, causing false alarm, so it cannot meet the protection level and corrosion resistance requirements of offshore wind power.

[0007] Therefore, we launch a new type of offshore wind power transformer liquid level meter with high reliability and independent double-way alarm output. The utility model discloses a liquid level meter for offshore wind power transformer

[0008] The utility model discloses a liquid level meter for offshore wind power transformer, which converts the change of oil liquid level in the transformer into the rotary motion of the float mechanism, drives the lower rotary shaft and lower magnetic steel to rotate by the rotary motion of the float mechanism, drives the upper magnetic steel in the microswitch mechanism to rotate by the rotation of the lower magnetic steel, further drives the needle fixed wheel and needle to rotate, triggers the microswitch to start by the needle rotating around the needle fixed wheel shaft, and the microswitch starts to connect the external alarm device to alarm, realizes remote output, and is convenient for timely maintenance.

[0009] The utility model provides a liquid level meter for offshore wind power transformer, which comprises:

[0010] Liquid level meter upper seat;

[0011] The lower end of the guide pipe is in sealed communication with the transformer, and the upper end of the guide pipe is riveted to the liquid level meter upper seat;

[0012] The guide pipe-spiral groove is arranged on the outer circle of the guide pipe;

[0013] The float mechanism is inserted into the guide pipe;

[0014] The float limiting peg is screwed onto the float mechanism through the guide pipe-spiral groove;

[0015] When the float mechanism floats with the liquid level, it rotates and lifts in the guide pipe through the float limiting peg and the guide pipe-spiral groove;

[0016] The lower rotary shaft is assembled on the upper end of the rotary transmission part of the float mechanism;

[0017] The lower magnetic steel is screwed onto the upper end of the lower rotary shaft, and four cylindrical strong magnets are uniformly distributed on the lower magnetic steel, and the NS magnetic poles of the four cylindrical strong magnets are alternately distributed;

[0018] The microswitch mechanism is assembled on the liquid level meter upper seat;

[0019] The rotation of the lower magnetic steel is used to trigger the microswitch mechanism, and the triggered microswitch mechanism is remotely electrically connected with the external alarm device, the maintenance device and the control device.

[0020] As a further optimization scheme, in order to be rotated and driven to trigger the start, the microswitch mechanism comprises:

[0021] The inner and outer threaded hexagonal columns are distributed in two groups from top to bottom;

[0022] The upper shaft welding pin welding plate is fixedly assembled on the inner wall bottom surface of the liquid level meter upper seat through the lower inner and outer threaded hexagonal columns;

[0023] upper shaft welding nail, the lower end of which is welded to the center of the upper shaft welding nail welding plate;

[0024] upper rotating shaft, which is sleeved on the upper end of the upper shaft welding nail, and the contact position of the upper end of the upper shaft welding nail with the upper rotating shaft is arranged with a 2mm stainless steel ball;

[0025] upper magnetic steel, which is screwed on the lower end of the outer wall of the upper rotating shaft, and the upper magnetic steel is uniformly distributed with cylindrical strong magnets, and there are four cylindrical strong magnets, and the NS magnetic poles of the four cylindrical strong magnets are alternately distributed;

[0026] The lower magnetic steel rotates to drive the upper magnetic steel to rotate;

[0027] Rolling needle fixing wheel, which is fixedly connected to the upper end of the upper rotating shaft;

[0028] Rolling needle, which is fixedly assembled on the rolling needle fixing wheel,

[0029] Microswitch fixed plate, which is screwed on the lower inner and outer threaded hexagonal column through the upper inner and outer threaded hexagonal column;

[0030] Microswitch position adjusting piece fixing screw;

[0031] Microswitch position adjusting piece fixing nut;

[0032] Microswitch position adjusting piece, the number of which is two, and the two microswitch position adjusting pieces are fixed at different positions on the microswitch fixed plate through the microswitch position adjusting piece fixing screw and the microswitch position adjusting piece fixing nut;

[0033] Insulating plate;

[0034] Microswitch fixing screw, which is screwed on the microswitch position adjusting piece through the insulating plate;

[0035] Microswitch, which is clamped between the insulating plate and the microswitch position adjusting piece, and the microswitch is triggered by the rotating rolling needle.

[0036] As a further optimization scheme, in order to convert the change of oil level into the rotational driving force of the lower magnetic steel, the float mechanism comprises:

[0037] Float, which is provided with a center hole, and the outer wall of the float is provided with a light hole penetrating the center hole, and the float is slidingly assembled in the guide pipe;

[0038] Transmission rotating strip, which penetrates the center hole of the float, and is a rotational transmission component of the float mechanism;

[0039] Float circular hole limiting sleeve, which is fixedly assembled at the lower end of the center hole of the float;

[0040] The float slot limiting sleeve is fixedly assembled on the upper end of the center hole of the float;

[0041] The transmission rotating strip passes through the float round hole limiting sleeve and the float slot limiting sleeve, and the outer wall of the transmission rotating strip is attached to the inner annular surface of the float slot limiting sleeve.

[0042] The inner and outer threaded screw sleeve is screwed in the light hole, and the end of the float limiting pin is screwed in the inner and outer threaded screw sleeve.

[0043] As a further optimization scheme, in order to exhaust the residual gas in the liquid level meter during transformer oil injection or facilitate gas extraction when gas is produced inside the transformer, an exhaust and sampling structure is further included, which comprises:

[0044] The gas exhaust valve joint is provided with an exhaust hole in the middle part;

[0045] The side wall of the liquid level meter upper seat is provided with a threaded hole in communication with the lower cavity, and one end of the gas exhaust valve joint is screwed in the threaded hole;

[0046] The gas exhaust valve joint and the product sealing rubber ring are assembled between the liquid level meter upper seat and the gas exhaust valve joint;

[0047] The ball valve is screwed into the other end of the gas exhaust valve joint;

[0048] The gas exhaust valve joint and the ball valve sealing rubber ring are assembled between the ball valve and the end of the gas exhaust valve joint;

[0049] The gas extraction joint is screwed into the upper end of the ball valve;

[0050] The ball valve and the gas extraction joint sealing ring are assembled between the gas extraction joint and the ball valve;

[0051] The dustproof cover is screwed into the upper end of the gas extraction joint;

[0052] The dustproof cover sealing ring is assembled between the end of the gas extraction joint and the dustproof cover.

[0053] As a further optimization scheme, in order to improve the firmness of the installation of the exhaust and sampling structure, the outer wall of the gas exhaust valve joint is fixedly assembled with a gas exhaust valve limiting block, the gas exhaust valve limiting block is penetrated by a gas exhaust valve limiting block compression screw, and the end of the gas exhaust valve limiting block compression screw is screwed into the outer wall of the liquid level meter upper seat.

[0054] As a further optimization scheme, in order to facilitate the lead-in of the microswitch mechanism and the lead-out of the electrical signal, a wiring structure is further included, which comprises:

[0055] The wiring box protective cover is buckled on the upper end of the liquid level meter upper seat;

[0056] The two left-right symmetrical distribution of the junction box protective cover mounting screws, the junction box protective cover two sides by two junction box protective cover mounting screws with liquid level meter upper seat outer wall screw fixed;

[0057] The junction box protective cover and the liquid level meter upper seat sealing gasket is assembled between the junction box protective cover and the liquid level meter upper seat upper end position;

[0058] The grounding wire terminal fixed plate is fixedly connected to the upper end of the inner and outer threaded hexagonal column by a disc head screw;

[0059] The terminal fastening screw;

[0060] The terminal;

[0061] The grounding terminal;

[0062] The terminal and the grounding terminal are fixedly connected to the grounding wire terminal fixed plate by the terminal fastening screw, and the wire of the micro switch is introduced to the terminal through the slot in the grounding wire terminal fixed plate;

[0063] The outer circle of the liquid level meter upper seat is provided with an internal thread on the upper side, and the outlet port gland and its sealing gasket are screwed in the internal thread.

[0064] As a further optimization scheme, in order to facilitate the display of product information, a slot is formed in the top surface of the junction box protective cover, and a product nameplate is fixedly attached in the slot.

[0065] As a further optimization scheme, in order to facilitate the sealed connection between the liquid level meter product and the transformer, it further comprises:

[0066] The transformer cover;

[0067] The liquid level meter mounting flange is fixedly connected to the transformer cover, the lower end of the liquid level meter upper seat is screwed to the upper end of the liquid level meter mounting flange, and the lower end of the guide pipe is inserted into the liquid level meter mounting flange;

[0068] The product and the mounting flange sealing rubber ring is assembled between the liquid level meter mounting flange and the liquid level meter upper seat.

[0069] As a further optimization scheme, in order to position the rotation of the transmission rotating strip, it further comprises:

[0070] The bottom support is riveted to the inner lower end of the guide pipe, a blind hole is formed in the upper surface of the bottom support, a 5mm stainless steel ball is inserted into the blind hole, a through hole is formed in the end face of the bottom support, and the through hole is used as a channel for the exchange of transformer oil inside and outside the liquid level meter;

[0071] A bottom center is fixedly connected to the lower end of the transmission rotating strip by a screw, and the lower tip of the bottom center abuts against a 5mm stainless steel ball.

[0072] As a further optimization, in order to support the inside of the guide tube and position the rotation of the transmission rotating strip, further comprising:

[0073] An upper limiting block is riveted to the upper end of the inside of the guide tube, and a central hole is formed in the upper limiting block, and the transmission rotating strip passes through the central hole of the upper limiting block.

[0074] Compared with the prior art, the liquid level meter for offshore wind power transformer has the following improvements and advantages:

[0075] Firstly, the device converts the change of the oil liquid level in the transformer into the rotary motion of the float mechanism, drives the lower rotating shaft and the lower magnetic steel to rotate by the rotary motion of the float mechanism, drives the upper magnetic steel in the micro switch mechanism to rotate by the rotation of the lower magnetic steel, and further drives the needle fixed wheel and the needle to rotate, triggers the micro switch to start by the needle rotating around the axis of the needle fixed wheel, and the micro switch starts to connect the external alarm device to alarm, realizes remote output, and facilitates timely maintenance.

[0076] Secondly, the micro switch has two micro switches, and double-way alarm is realized.

[0077] Thirdly, the device structure is more compact by removing the structure occupying a larger space, such as the traditional liquid level meter glass window for observing the change of red and blue indicating floats to judge the liquid level of the transformer or the dial pointer to judge whether the transformer is short of oil, and the anti-shock ability is further improved.

[0078] Fourthly, wiring is performed through the wiring structure, wiring terminals and grounding terminals are arranged, wiring is convenient, the outside is provided with a wiring box protective cover for protection, wiring is performed through the outlet port gland, the outlet port gland is provided with a sealing gasket to meet the IP protection level requirement of the outlet, meets the protection level and corrosion resistance requirement of offshore wind power, avoids the wiring place from being easily damp or waterlogged after rain or snow to cause false alarm, and facilitates remote control. BRIEF DESCRIPTION OF DRAWINGS

[0079] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor.

[0080] Figure 1 It is a local structure schematic view of the utility model;

[0081] Figure 2 is a left view structural schematic diagram of the utility model;

[0082] Figure 3 is a top view structural schematic diagram of the utility model;

[0083] Figure 4 is a left view structural schematic diagram of the utility model Figure 1 is a structural schematic section view at A-A of the utility model;

[0084] Figure 5 is a top view structural schematic diagram of the utility model Figure 2 is a structural schematic section view at B-B of the utility model;

[0085] Figure 6 is a three-dimensional structural schematic diagram of the micro switch mechanism of the utility model;

[0086] Figure 7 is a top view structural schematic diagram of the micro switch mechanism of the utility model;

[0087] Figure 8 is a top view structural schematic diagram of the utility model Figure 7 is a structural schematic section view at C-C of the utility model;

[0088] Figure 9 is a front view structural schematic diagram of the micro switch mechanism of the utility model;

[0089] Figure 10 is a structural schematic diagram of the float mechanism of the utility model;

[0090] Figure 11 is a top view structural schematic diagram of the float mechanism of the utility model;

[0091] Figure 12 is a structural schematic section view at D-D of the utility model.

[0092] Explanation of reference signs:

[0093] 1, bottom support; 2, 5mm stainless steel ball; 3, bottom center; 4, first countersunk screw; 5, float mechanism; 5.1, float round hole limiting sleeve; 5.2, float; 5.3, internal and external threaded sleeve; 5.4, float slot limiting sleeve; 5.5, transmission rotating bar; 6, transformer cover; 7, liquid level meter mounting flange; 8, guide pipe; 9, upper limiting block; 10, lower rotating shaft; 11, second countersunk screw; 12, expansion pin; 13, product and installation flange sealing rubber ring; 14, lower magnetic steel; 15, exhaust hole; 16, air release valve joint and product sealing rubber ring; 17, air release valve joint; 18, air release valve joint and ball valve sealing rubber ring; 19, ball valve; 20, ball valve and gas extraction joint sealing ring; 21, gas extraction joint; 22, dust cover sealing ring; 23, dust cover; 24, liquid level meter upper seat; 25, junction box protective cover and liquid level meter upper seat sealing pad; 26, junction box protective cover; 27, product nameplate; 28, terminal; 29, terminal fastening screw; 30, ground terminal fixing plate; 31, micro switch mechanism; 31.1, micro switch; 31.2, micro switch position adjusting piece; 31.3, insulating plate; 31.4, micro switch fixing screw; 31.5, micro switch position adjusting piece fixing screw; 31.6, upper shaft welding pin welding plate; 31.7, upper shaft welding pin; 31.8, upper rotating shaft; 31.9, 2mm stainless steel ball; 31.10, needle roller fixed wheel; 31.11, needle roller; 31.12, internal and external threaded hexagonal column; 31.13, micro switch fixing plate; 31.14, upper magnetic steel; 31.15, cylindrical strong magnet; 31.16, micro switch position adjusting piece fixing nut; 32, guide pipe-spiral groove; 33, float limiting pin; 34, junction box protective cover mounting screw; 35, ground terminal; 36, outlet port gland and its sealing pad; 37, air release valve limiting block; 38, air release valve limiting block pressing screw. DETAILED DESCRIPTION

[0094] The technical solutions of the present application will be described clearly and completely in combination with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0095] In the description of the utility model, need understanding is, the term "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and so on indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawing, just is for the convenience of describing the utility model and simplifying the description, and it is not indicated or implied that the indicated device or element must have a particular orientation, construct and operate in a particular orientation, therefore it can not be understood as the limitation of the utility model.

[0096] In the description of the utility model, need understanding is, the term "first", "second" is only for the purpose of description, and can not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited. In addition, the terms "mounting", "connection", "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0097] Please refer to Figures 1-12 The utility model provides technical scheme: a liquid level meter for offshore wind power transformer, including:

[0098] The liquid level meter upper seat 24 is processed from extruded aluminum profile, and the material density is good, the weight is light, the strength is high, and the corrosion resistance is better than that of cast aluminum alloy; The outer circle of the lower end of the liquid level meter upper seat 24 is processed with threads, the threads are used to be connected with the liquid level meter mounting flange 7, three radial angle 120-degree counterbores are processed on the threads, a 3mm through hole is processed at the bottom of the counterbores, is used for the assembly and is equipped with elastic expansion pin 12, and the guide pipe 8 is riveted on the liquid level meter upper seat 24 through the elastic expansion pin 12;

[0099] The lower end of the guide pipe 8 is sealingly communicated with the transformer, and the upper end of the guide pipe 8 is riveted on the liquid level meter upper seat 24;

[0100] The guide pipe-spiral groove 32 is arranged on the outer circle of the guide pipe 8;

[0101] The float mechanism 5 is inserted into the guide pipe 8;

[0102] The float limiting pin 33 is screwed on the float mechanism 5 through the guide pipe-spiral groove 32.

[0103] The float mechanism 5 rotates up and down in the guide pipe 8 through the float limiting nail 33 and the guide pipe-spiral groove 32 when it floats with the liquid level;

[0104] The lower rotating shaft 10 is assembled on the upper end of the rotating transmission part of the float mechanism 5, and the lower end of the lower rotating shaft 10 is fixedly connected to the upper end of the transmission rotating strip 5.5 through two second countersunk head screws 11;

[0105] The lower magnetic steel 14 is screwed on the upper end of the lower rotating shaft 10, and the lower magnetic steel 14 uniformly has four cylindrical strong magnets on the upper end, and the NS magnetic poles of the four cylindrical strong magnets are alternately distributed;

[0106] The micro switch mechanism 31 is assembled on the liquid level meter upper seat 24;

[0107] The lower magnetic steel 14 rotates to trigger the micro switch mechanism 31, and the micro switch mechanism 31 is remotely electrically connected with external alarm equipment, maintenance equipment and control equipment.

[0108] In some embodiments, in order to be driven to trigger the start by the rotating lower magnetic steel 14, the micro switch mechanism 31 realizes the sensing of the change of the liquid level, which includes:

[0109] The inner and outer threaded hexagonal columns 31.12 are distributed in two groups on the upper and lower ends;

[0110] The upper shaft welding nail welding plate 31.6 is fixedly assembled on the inner wall bottom surface of the liquid level meter upper seat 24 through the lower inner and outer threaded hexagonal columns 31.12;

[0111] The upper shaft welding nail 31.7 is welded at the center of the upper shaft welding nail welding plate 31.6;

[0112] The upper rotating shaft 31.8 is sleeved on the upper end of the upper shaft welding nail 31.7, and a 2mm stainless steel ball 31.9 is arranged at the contact position between the upper end of the upper shaft welding nail 31.7 and the upper rotating shaft 31.8, which reduces the friction between the upper shaft welding nail 31.7 and the upper rotating shaft 31.8;

[0113] The upper magnetic steel 31.14 is screwed on the outer wall lower end of the upper rotating shaft 31.8, and the upper magnetic steel 31.14 uniformly has cylindrical strong magnets 31.15 on the upper end, and there are four cylindrical strong magnets 31.15, and the NS magnetic poles of the four cylindrical strong magnets 31.15 are alternately distributed;

[0114] The lower magnetic steel 14 rotates to drive the upper magnetic steel 31.14 to rotate, and when the lower magnetic steel 14 rotates, the four cylindrical strong magnets 31.15 on the upper magnetic steel 31.14 are driven to rotate through the alternately distributed NS magnetic poles of the four cylindrical strong magnets;

[0115] Rolling pin fixed wheel 31.10, which is fixedly connected to the upper end of the upper rotating shaft 31.8;

[0116] Rolling pin 31.11, which is fixedly assembled on the rolling pin fixed wheel 31.10,

[0117] Micro switch fixed plate 31.13, which is screwed to the lower internal and external threaded hexagonal column 31.12 through the upper internal and external threaded hexagonal column 31.12;

[0118] Micro switch position adjusting piece fixing screw 31.5;

[0119] Micro switch position adjusting piece fixing nut 31.16;

[0120] Micro switch position adjusting piece 31.2, which has two in number, and the two micro switch position adjusting pieces 31.2 are fixed at different positions on the micro switch fixed plate 31.13 through the micro switch position adjusting piece fixing screw 31.5 and the micro switch position adjusting piece fixing nut 31.16;

[0121] The micro switch position adjusting piece fixing screw 31.5 and the micro switch position adjusting piece fixing nut 31.16 are clamped at the edge position of the micro switch position adjusting piece 31.2, and this design allows the position of the micro switch position adjusting piece 31.2 to be finely adjusted;

[0122] Insulating plate 31.3;

[0123] Micro switch fixing screw 31.4, which is screwed to the micro switch position adjusting piece 31.2 through the insulating plate 31.3;

[0124] Micro switch 31.1, which is clamped between the insulating plate 31.3 and the micro switch position adjusting piece 31.2 for insulation protection;

[0125] The lower magnetic steel 14 rotates to drive the upper magnetic steel 31.14 to rotate, and the upper magnetic steel 31.14 drives the rolling pin fixed wheel 31.10 and the rolling pin 31.11 to rotate, and the rolling pin 31.11 rotating around the axis of the rolling pin fixed wheel 31.10 triggers the start of the micro switch 31.1, which starts to connect the external alarm device to alarm, realizes remote output, and facilitates timely maintenance.

[0126] The micro switch 31.1 is triggered by the rotating rolling pin 31.11.

[0127] In some embodiments, in order to convert the change of oil level into the rotational driving force of the lower magnetic steel 14, the float mechanism 5 includes:

[0128] Float 5.2, which is provided with a center hole, and the outer wall of the float 5.2 is provided with a light hole penetrating the center hole, the float 5.2 is slidingly assembled in the guide pipe 8, the float 5.2 is processed by a hollow foamed nitrile oil-resistant rubber float;

[0129] Transmission rotating bar 5.5, which penetrates the center hole of the float 5.2, is a rotating transmission component of the float mechanism 5, and the included angle of the side surface of the transmission rotating bar 5.5 is polished;

[0130] Float round hole limiting sleeve 5.1, which is fixedly assembled at the lower end of the center hole of the float 5.2, is used to prevent the transmission rotating bar 5.5 from scratching and damaging the float 5.2, reduce the friction, and increase the smoothness of the up and down movement of the float 5.2;

[0131] Float slot limiting sleeve 5.4, which is fixedly assembled at the upper end of the center hole of the float 5.2, is processed with a slot in the center which is slightly larger than the thickness of the transmission rotating bar 5.5, and the transmission rotating bar 5.5 penetrates the middle of the float slot limiting sleeve 5.4;

[0132] The transmission rotating bar 5.5 penetrates the float round hole limiting sleeve 5.1 and the float slot limiting sleeve 5.4, and the outer wall of the transmission rotating bar 5.5 is in contact with the inner ring surface of the float slot limiting sleeve 5.4;

[0133] Internal and external threaded screw sleeve 5.3, which is screwed into the light hole, and the end of the float limiting pin 33 is screwed into the internal and external threaded screw sleeve 5.3; a light hole penetrating the center hole is processed in the middle of the outer circle of the float 5.2, and a special tool is used to install the internal and external threaded screw sleeve 5.3 on the light hole; after the external thread of the internal and external threaded screw sleeve 5.3 is screwed on the light hole of the float 5.2, it is taken out, and the thread is coated with thread glue and tightened; during the final assembly, the entire internal float mechanism 5 is placed in the guide pipe 8, the internal and external threaded screw sleeve 5.3 on the float 5.2 is aligned with the lower end of the guide pipe-spiral groove 32 on the guide pipe 8, the float limiting pin 33 coated with thread glue is screwed into the internal and external threaded screw sleeve 5.3 through the guide pipe-spiral groove 32, and the head of the float limiting pin 33 is kept at a proper distance from the guide pipe 8 to ensure the sliding of the float limiting pin 33 in the guide pipe-spiral groove 32.

[0134] The up and down movement of the float 5.2 is converted into the rotating movement of the lower magnetic steel 14 under the joint action of the guide pipe-spiral groove 32, the float limiting pin 33, the float slot limiting sleeve 5.4, and the transmission rotating bar 5.5 on the guide pipe 8; the float 5.2 spirally ascends and descends in the guide pipe 8 through the guide pipe-spiral groove 32 and the float limiting pin 33, and the float slot limiting sleeve 5.4 in the float 5.2 drives the transmission rotating bar 5.5 and the lower magnetic steel 14 to rotate through friction.

[0135] In some embodiments, in order to exhaust the residual gas in the liquid level gauge during transformer oil injection or to facilitate gas extraction when gas is produced inside the transformer, an exhaust and sampling structure is further included, which comprises:

[0136] The gas exhaust valve joint 17 has an exhaust hole 15 in its middle part, and the cross section of the gas exhaust valve joint 17 is square;

[0137] A threaded hole is formed in the side wall of the liquid level gauge upper seat 24 and communicates with the lower cavity, and one end of the gas exhaust valve joint 17 is screwed into the threaded hole;

[0138] The gas exhaust valve joint and product sealing rubber ring 16 is assembled between the liquid level gauge upper seat 24 and the gas exhaust valve joint 17, and this position is a side seal for double sealing, the resistance of the gas exhaust valve joint 17 is small, and the sealing effect is good;

[0139] The ball valve 19 is screwed into the other end of the gas exhaust valve joint 17;

[0140] The gas exhaust valve joint and ball valve sealing rubber ring 18 is assembled between the ball valve 19 and the end of the gas exhaust valve joint 17;

[0141] The gas extraction joint 21 is screwed into the upper end of the ball valve 19;

[0142] The ball valve and gas extraction joint sealing ring 20 is assembled between the gas extraction joint 21 and the ball valve 19;

[0143] The dust cover 23 is screwed onto the upper end of the gas extraction joint 21 for dust prevention;

[0144] The dust cover sealing ring 22 is assembled between the end of the gas extraction joint 21 and the dust cover 23.

[0145] In some embodiments, in order to improve the firmness of the installation of the exhaust and sampling structure, the outer wall of the gas exhaust valve joint 17 is fixedly assembled with a gas exhaust valve limiting block 37, a gas exhaust valve limiting block pressing screw 38 is threaded through the gas exhaust valve limiting block 37, and the end of the gas exhaust valve limiting block pressing screw 38 is screwed onto the outer wall of the liquid level gauge upper seat 24.

[0146] In some embodiments, in order to facilitate the lead-in of the microswitch mechanism 31 and the lead-out of the electrical signal, a wiring structure is further included, which comprises:

[0147] The wiring box protective cover 26 is buckled onto the upper end of the liquid level gauge upper seat 24;

[0148] The wiring box protective cover mounting screw 34 is symmetrically distributed on the left and right sides, and the left and right sides of the wiring box protective cover 26 are fixedly screwed to the outer wall of the liquid level gauge upper seat 24 through the two wiring box protective cover mounting screws 34;

[0149] The outlet direction of the outlet gland can be adjusted by loosening the terminal box cover mounting screw 34. After loosening the terminal box cover mounting screw 34, the terminal box cover 26 is removed, rotated by 180 degrees, and then screwed again with the terminal box cover mounting screw 34. Rotating the terminal box cover 26 changes the outlet port gland and its sealing pad 36, and adjusts the outlet direction of the outlet gland.

[0150] The terminal box cover and the liquid level meter upper seat sealing pad 25 are assembled between the terminal box cover 26 and the upper end of the liquid level meter upper seat 24.

[0151] The grounding wire terminal fixing plate 30 is fixedly connected to the upper end of the internal and external threaded hexagonal column 31.12 by a disc head screw.

[0152] The terminal fastening screw 29;

[0153] The terminal 28;

[0154] The grounding terminal 35;

[0155] The terminal 28 and the grounding terminal 35 are both fixedly connected to the grounding wire terminal fixing plate 30 by the terminal fastening screw 29. The wires of the micro switch 31.1 are introduced to the terminal 28 through the slot in the grounding wire terminal fixing plate 30.

[0156] The outer circle of the liquid level meter upper seat 24 is internally threaded, and the outlet port gland and its sealing pad 36 are screwed into the internal threads.

[0157] In some embodiments, in order to facilitate the display of product information, a slot is formed in the top surface of the terminal box cover 26, and a product nameplate 27 is fixedly attached in the slot.

[0158] In some embodiments, in order to facilitate the sealed connection between the liquid level meter product and the transformer, the following are further included:

[0159] The transformer cover 6;

[0160] The liquid level meter mounting flange 7 is fixedly connected to the transformer cover 6. The lower end of the liquid level meter upper seat 24 is screwed to the upper end of the liquid level meter mounting flange 7, and the lower end of the guide pipe 8 is inserted into the liquid level meter mounting flange 7.

[0161] The product and mounting flange sealing rubber ring 13 is assembled between the liquid level meter mounting flange 7 and the liquid level meter upper seat 24. An annular sealing groove is machined on the upper outer circle of the liquid level meter upper seat 24 near the thread relief groove, for mounting the product and mounting flange sealing rubber ring 13. This sealing method is side sealing, which requires small clamping force and has good sealing effect.

[0162] In some embodiments, in order to position the rotation of the transmission rotating bar 5.5, further comprising:

[0163] The bottom support 1 is riveted to the inner lower end of the guide pipe 8, a blind hole is formed in the middle of the upper surface of the bottom support 1, and a 5mm stainless steel ball 2 is inserted into the blind hole. A through hole is formed in the end face of the bottom support 1, which is used as a channel for the exchange of transformer oil between the inner and outer transformers.

[0164] The bottom center 3 is fixedly connected to the lower end of the transmission rotating bar 5.5 by screws, and the lower side of the bottom center 3 abuts against the 5mm stainless steel ball 2, reducing the friction of the bottom center 3 rotating.

[0165] A through hole is formed on the outer circle of the lower end of the guide pipe 8, which is used for drilling and riveting the bottom support 1 with the elastic expansion pin 12. There are three through holes on the end face of the bottom support 1. There are through holes with a spacing of 5mm and a size of 3.2mm on the upper and lower ends of the transmission rotating bar 5.5. There are two countersunk screws 4 fixed bottom centers 3 on the lower end of the transmission rotating bar 5.5.

[0166] In some embodiments, in order to support the inside 8 of the guide pipe, position the rotation of the transmission rotating bar 5.5, further comprising:

[0167] The upper limit block 9 is riveted to the inner upper end of the guide pipe 8, and a central hole is formed in the upper limit block 9. The transmission rotating bar 5.5 passes through the central hole of the upper limit block 9.

[0168] Working principle:

[0169] When the oil level in the transformer changes, the float 5.2 rises and falls in the guide pipe-spiral groove 32, the float limit pin 33, and the guide pipe 8. The float slot limit sleeve 5.4 in the float 5.2 drives the transmission rotating bar 5.5 and the lower magnetic steel 14 to rotate by friction;

[0170] The rotation of the lower magnetic steel 14 drives the rotation of the upper magnetic steel 31.14, which in turn drives the rotation of the needle fixed wheel 31.10 and the needle 31.11. The needle 31.11 rotating around the needle fixed wheel 31.10 triggers the start of the micro switch 31.1, which starts to connect the external alarm device to alarm, realizing remote output, and facilitating timely maintenance.

[0171] Finally, it should be noted that: the above embodiments are used to illustrate the technical solutions of the present application, but not limited to them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A liquid level gauge for a marine wind power transformer, characterized in that It comprises: a liquid level meter upper seat (24); a guide pipe (8) with its lower end in sealed communication with the transformer, the upper end of the guide pipe (8) riveted to the liquid level meter upper seat (24); a guide pipe-spiral groove (32) opened on the outer circle of the guide pipe (8); a float mechanism (5) inserted into the guide pipe (8); a float limiting pin (33) screwed to the float mechanism (5) through the guide pipe-spiral groove (32); when the float mechanism (5) floats with the liquid level, it rotates and rises and falls in the guide pipe (8) through the float limiting pin (33) and the guide pipe-spiral groove (32); a lower rotating shaft (10) assembled on the upper end of the rotating transmission part of the float mechanism (5); a lower magnetic steel (14) screwed on the upper end of the lower rotating shaft (10), the lower magnetic steel (14) uniformly distributed with four cylindrical strong magnets, and the NS magnetic poles of the four cylindrical strong magnets alternately distributed; a micro switch mechanism (31) assembled on the liquid level meter upper seat (24); the lower magnetic steel (14) rotates to trigger the micro switch mechanism (31), the triggered micro switch mechanism (31) remotely electrically connected with external alarm equipment, maintenance equipment and control equipment.

2. A liquid level gauge for a marine transformer according to claim 1, characterized in that The micro switch mechanism (31) comprises: two groups of inner and outer threaded hexagonal columns (31.12) distributed on the upper and lower ends; an upper shaft welding pin welding plate (31.6) fixedly assembled on the inner wall bottom surface of the liquid level meter upper seat (24) through the lower inner and outer threaded hexagonal columns (31.12); an upper shaft welding pin (31.7) welded on the center of the upper shaft welding pin welding plate (31.6); an upper rotating shaft (31.8) sleeved on the upper end of the upper shaft welding pin (31.7), the upper end of the upper shaft welding pin (31.7) arranged with a 2mm stainless steel ball (31.9) in contact with the upper rotating shaft (31.8); an upper magnetic steel (31.14) screwed on the outer wall lower end of the upper rotating shaft (31.8), the upper magnetic steel (31.14) uniformly distributed with cylindrical strong magnets (31.15), and four cylindrical strong magnets (31.15), the NS magnetic poles of the four cylindrical strong magnets (31.15) alternately distributed; the lower magnetic steel (14) rotates to drive the upper magnetic steel (31.14) to rotate; a needle fixed wheel (31.10) fixedly connected to the upper end of the upper rotating shaft (31.8); a needle (31.11) fixedly assembled on the needle fixed wheel (31.10), a micro switch fixed plate (31.13) screwed on the lower inner and outer threaded hexagonal columns (31.12) through the upper inner and outer threaded hexagonal columns (31.12); a micro switch position adjusting piece fixing screw (31.5); a micro switch position adjusting piece fixing nut (31.16); two micro switch position adjusting pieces (31.2) fixed on the micro switch fixed plate (31.13) at different positions through the micro switch position adjusting piece fixing screw (31.5) and the micro switch position adjusting piece fixing nut (31.16); an insulating plate (31.3). Micro switch fixing screw (31.4) which is screwed on micro switch position adjusting sheet (31.2) through insulating plate (31.3); Micro switch (31.1) which is clamped between insulating plate (31.3) and micro switch position adjusting sheet (31.2), the micro switch (31.1) is triggered by rotating needle (31.11).

3. A liquid level gauge for a marine wind power transformer according to claim 1, characterized in that The float mechanism (5) comprises: The float (5.2) is provided with a central hole, and the outer wall of the float (5.2) is provided with a light hole penetrating the central hole, the float (5.2) is slidingly assembled in the guide pipe (8); The transmission rotating bar (5.5) penetrates the central hole of the float (5.2) and is a rotating transmission component of the float mechanism (5); The float circular hole limiting sleeve (5.1) is fixedly assembled at the lower end of the central hole of the float (5.2); The float slot limiting sleeve (5.4) is fixedly assembled at the upper end of the central hole of the float (5.2); The transmission rotating bar (5.5) penetrates the float circular hole limiting sleeve (5.1) and the float slot limiting sleeve (5.4), and the outer wall of the transmission rotating bar (5.5) is in contact with the inner annular surface of the float slot limiting sleeve (5.4); The inner and outer threaded sleeve (5.3) is screwed in the light hole, and the end of the float limiting pin (33) is screwed in the inner and outer threaded sleeve (5.3).

4. A liquid level gauge for a marine wind power transformer according to claim 1, characterized in that It also comprises an exhaust and sampling structure, the exhaust and sampling structure comprises: The air release valve connector (17) is provided with an exhaust hole (15) in the middle; The side wall of the liquid level meter upper seat (24) is provided with a threaded hole in communication with the lower cavity, and one end of the air release valve connector (17) is screwed into the threaded hole; The air release valve connector and the product seal rubber ring (16) are assembled at the position between the liquid level meter upper seat (24) and the air release valve connector (17); The ball valve (19) is screwed into the other end of the air release valve connector (17); The air release valve connector and the ball valve seal rubber ring (18) are assembled at the position between the ball valve (19) and the end of the air release valve connector (17); The air release valve connector and the ball valve seal rubber ring (18) are assembled at the position between the ball valve (19) and the end of the air release valve connector (17); The air release valve connector and the ball valve seal rubber ring (18) are assembled at the position between the ball valve (19) and the end of the air release valve connector (17); The air release valve connector and the ball valve seal rubber ring (18) are assembled at the position between the ball valve (19) and the end of the air release valve connector (17); The air release valve connector and the ball valve seal rubber ring (18) are assembled at the position between the ball valve (19) and the end of the air release valve connector (17); 5. A liquid level gauge for a marine wind power transformer according to claim 4, characterized in that The air release valve connector and the ball valve seal rubber ring (18) are assembled at the position between the ball valve (19) and the end of the air release valve connector (17); 6. A liquid level gauge for a marine wind power transformer according to claim 2, characterized in that The outer wall of the air release valve connector (17) is fixedly provided with an air release valve limiting block (37), the air release valve limiting block (37) is provided with an air release valve limiting block pressing screw (38) penetrating therethrough, and the end of the air release valve limiting block pressing screw (38) is screwed into the outer wall of the liquid level meter upper seat (24). It also comprises a wiring structure, the wiring structure comprises: The wiring box protective cover (26) is buckled on the upper end of the liquid level meter upper seat (24); The wiring box protective cover mounting screw (34) is symmetrically distributed on the left and right sides, and the two sides of the wiring box protective cover (26) are screwed and fixed with the outer wall of the liquid level meter upper seat (24) through the two wiring box protective cover mounting screws (34). The junction box protective cover and the liquid level meter upper seat sealing gasket (25) are assembled between the junction box protective cover (26) and the upper end of the liquid level meter upper seat (24); The grounding wire terminal fixing plate (30) is fixedly connected to the upper end of the inner and outer threaded hexagonal column (31.12) by a disc head screw; The junction terminal fastening screw (29); The junction terminal (28); The grounding terminal (35); The junction terminal (28) and the grounding terminal (35) are fixedly connected to the grounding wire terminal fixing plate (30) by the junction terminal fastening screw (29), and the wire of the micro switch (31.1) is introduced to the junction terminal (28) through the slot in the grounding wire terminal fixing plate (30); The outer circle of the liquid level meter upper seat (24) is provided with an inner thread on the upper side, and a wire outlet gland and its sealing gasket (36) are screwed in the inner thread.

7. A liquid level gauge for a marine wind power transformer according to claim 6, characterized in that The top surface of the junction box protective cover (26) is provided with a slot, and a product nameplate (27) is fixedly attached in the slot.

8. A liquid level gauge for a marine wind power transformer according to claim 1, characterized in that Further comprising: The transformer box cover (6); The liquid level meter mounting flange (7) is fixedly connected to the transformer box cover (6), the lower end of the liquid level meter upper seat (24) is screwed to the upper end of the liquid level meter mounting flange (7), and the lower end of the guide pipe (8) is inserted into the liquid level meter mounting flange (7); The product and mounting flange sealing rubber ring (13) is assembled between the liquid level meter mounting flange (7) and the liquid level meter upper seat (24).

9. A liquid level gauge for a marine wind power transformer according to claim 3, characterized in that Further comprising: The bottom support (1) is riveted to the inner lower end of the guide pipe (8), a blind hole is formed in the upper surface of the bottom support (1), a 5mm stainless steel ball (2) is inserted into the blind hole, a through hole is formed in the end surface of the bottom support (1), and the through hole is used as a channel for the exchange of transformer oil inside and outside the liquid level meter; The bottom center (3) is fixedly connected to the lower end of the transmission rotating strip (5.5) by a screw, and the lower side of the bottom center (3) abuts against the 5mm stainless steel ball (2).

10. A liquid level gauge for a marine wind power transformer according to claim 3, characterized in that Further comprising: The upper limit block (9) is riveted to the inner upper end of the guide pipe (8), and a center hole is formed in the upper limit block (9), and the transmission rotating strip (5.5) passes through the center hole of the upper limit block (9).

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