CN114171289A

CN114171289A - Oil-immersed transformer shell

Info

Publication number: CN114171289A
Application number: CN202111495453.2A
Authority: CN
Inventors: 郑小琴
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-12-09
Filing date: 2021-12-09
Publication date: 2022-03-11

Abstract

The invention belongs to the field of oil-immersed transformers, and particularly relates to an oil-immersed transformer shell which comprises a transformer oil tank, an oil filling valve mechanism, an oil discharge valve mechanism and an oil discharge mechanism, wherein the oil filling valve mechanism communicated with the top end in the transformer oil tank through an oil filling pipe A and the oil discharge valve mechanism communicated with the bottom in the transformer oil tank through a horizontal oil discharge pipe are respectively arranged in two mounting grooves on the outer side of the transformer oil tank; the oil discharging mechanism serves as an oil discharging channel when the transformer oil tank needs oil discharging, serves as an oil injecting channel when oil is injected, can replace a traditional auxiliary oil injecting or oil discharging oil pipe, and is simple to operate.

Description

Oil-immersed transformer shell

Technical Field

The invention belongs to the field of oil-immersed transformers, and particularly relates to a shell of an oil-immersed transformer.

Background

With the rapid increase of the capacity and volume of an oil-immersed transformer in the construction of a power grid, the oil loading in the transformer reaches dozens of tons or even hundreds of tons, and how to rapidly, safely and thoroughly drain and fill the transformer oil in a transformer oil tank becomes an important design point in the design of the transformer.

In the use process of the transformer, the change of the outside air temperature can cause the change of the oil level of the transformer inside the transformer. When the oil level of the transformer in the transformer changes, a corresponding oil discharge or oil injection switch valve is needed, so that the operation is complex and the efficiency is not high.

In addition, firstly, the oil in the transformer tank is not completely discharged outwards because the siphon effect cannot be formed in the conventional transformer. Moreover, when the transformer discharges oil or injects oil, additional oil pipes are needed for auxiliary oil discharge or injection, and the efficiency is also low. Finally, when the outside air temperature changes very little, although the change range of the transformer oil level in the transformer oil tank is small, partial oil discharging or oil filling operation is required to ensure the normal and effective work of the transformer.

The invention designs an oil-immersed transformer shell to solve the problems.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention discloses an oil-immersed transformer shell, which is realized by adopting the following technical scheme.

In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention conventionally use, which are merely for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, or be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

The utility model provides an oil-immersed transformer shell, it includes the transformer tank, annotate oil valve mechanism, arrange and annotate the mechanism, wherein install respectively in two mounting grooves in the transformer tank outside through annotating the communicating notes oil valve mechanism in the inside top of notes oil pipe A and transformer tank and through the communicating oil valve mechanism of bottom in horizontal row oil pipe and the transformer tank to sealing ring in annotating oil valve mechanism or arranging oil valve mechanism can effectively cooperate with the seal groove A and the seal groove B of arranging the square bar and the square bar lateral wall of annotating the mechanism. The side wall of the transformer oil tank is vertically matched with an oil injection mechanism and an oil discharge mechanism in a sliding manner; the oil filling valve mechanism and the oil discharging valve and the oil filling valve mechanism are the same in structure; when oil is discharged, the oil discharge valve mechanism is opened, and the oil discharge mechanism serves as an oil discharge channel; when oil is filled, the oil discharge valve mechanism is closed, the oil filling valve mechanism is opened, and the oil discharge mechanism serves as an oil filling channel.

The oil injection valve mechanism comprises a valve shell, a valve plug A, a spring A, a pull rod A, a circular pipe, a spring B and a sealing ring, wherein a cavity A and a cavity B which are communicated through an oil through hole C are formed in the valve shell; an oil through opening A on the end wall of the cavity A is communicated with the oil filling pipe A, and a circular pipe axially slides in an oil through opening B on the end wall of the cavity B; a spring B for resetting the circular tube is arranged in the cavity B; a valve plug A for opening and closing the oil through hole C is axially moved in the cavity A, a pull rod A in transmission connection with a circular pipe is axially moved in a circular groove A on the end face of the valve plug A, and a spring A for relatively resetting the valve plug A and the pull rod A is arranged in the circular groove A; the tail end of the circular tube is provided with a sealing ring matched with the discharging and injecting mechanism.

The discharging and injecting mechanism comprises a square rod, a valve plug B, a spring C, a pull rod B, a telescopic rod, a spring D, a spring E, a push rod A, a valve plug C, a spring F, a spring G, a valve plug D and a push rod C, wherein a discharging and injecting channel is arranged in the square rod which vertically slides on the outer side wall of the transformer oil tank, and the valve plug B for switching an oil filling port A at the upper end of the discharging and injecting channel and the valve plug C for switching an oil discharging port A at the lower end of the discharging and injecting channel vertically move; the pull rod B which moves vertically is in sliding fit with the valve plug B, and a reset spring C is arranged between the valve plug B and the pull rod B; a spring E for resetting the valve plug B is arranged in the exhaust and injection channel; the ejector rod A fixedly connected with the valve plug B is in sliding fit with the valve plug C, and a reset spring F is arranged between the valve plug C and the ejector rod A; the exposed end of the pull rod B is provided with a horizontal telescopic rod which is matched with a clamping block on the side wall of the transformer oil tank when the oil discharge mechanism is used as an oil discharge channel; the telescopic rod is internally provided with a spring D for telescopic resetting.

A sealing groove B matched with a sealing ring in the oil filling valve mechanism or the oil discharge valve mechanism is formed in an oil discharge port B in the side wall of the oil discharge channel; a sealing groove A matched with a sealing ring in the oil filling valve mechanism or the oil discharge valve mechanism is arranged at an oil filling port B on the side wall of the oil discharge channel; a valve plug D for opening and closing the oil filling port B is horizontally moved in the oil discharging passage, and a spring G for resetting the valve plug D is arranged in the oil discharging passage; the middle part of the end surface of the valve plug D is provided with a mandril C which is matched with a trigger block which is fixed at the middle part of a sealing ring of the oil injection valve mechanism and does not block a circular pipe; and a lath matched with a sealing ring in the oil drain valve mechanism is arranged at the lower end of the square rod.

As a further improvement of the technology, the inner conical surface A matched with the outer conical surface A at the end part of the corresponding valve plug A is arranged on the inner wall of the oil through opening C, so that the sealing contact area of the valve plug A and the oil through opening C is increased, and meanwhile, the valve plug A can be effectively restrained at the oil through opening C without moving, and a better sealing effect is achieved. The inner wall of the sealing groove A is provided with an inner conical surface E, the inner conical surface E is matched with an outer conical surface B at the end part of a sealing ring in the oil injection valve mechanism, so that the sealing ring can freely enter and exit the sealing groove A when the square rod moves vertically while the effective sealing of the sealing ring and the oil injection port B is achieved. The inner wall of the sealing groove B is provided with an inner conical surface F, the inner conical surface F is matched with an outer conical surface B at the end part of a sealing ring in the oil injection valve mechanism or the oil discharge valve mechanism, so that the sealing ring can freely enter and exit the sealing groove B when the square rod moves vertically while the effective sealing of the sealing ring and the oil discharge port B is achieved. The outer circular conical surface E of valve plug D tip cooperates with the interior circular conical surface D of oiling mouth B inner wall to can retrain valve plug D in oiling mouth B department and not take place to remove effectively simultaneously at increase valve plug D and oiling mouth B's sealed area of contact, thereby reach better sealed effect. The outer conical surface C of valve plug B tip cooperates with the interior conical surface C of oiling mouth A inner wall to can retrain valve plug B in oiling mouth A department and not take place to remove effectively simultaneously at increase valve plug B and oiling mouth A's sealed area of contact, thereby reach better sealed effect. The outer conical surface D of valve plug C tip cooperates with the interior conical surface B of oil drain port A inner wall to can retrain valve plug C in oil drain port A department and not take place to remove effectively simultaneously at increase valve plug C and oil drain port A's sealed area of contact, thereby reach better sealed effect.

As a further improvement of the present technology, the spring B is a compression spring; one end of the spring B is connected with the inner wall of the cavity B, and the other end of the spring B is connected with the ring sleeve A arranged on the corresponding circular tube; a sliding block A fixedly connected with a pull rod A slides in a ring groove A on the inner wall of the circular groove A. The slider a ensures relative movement between the tie rod a and the valve plug a. One end of the spring A is connected with the sliding block A, and the other end of the spring A is connected with the inner wall of the annular groove A; the spring A and the spring B are both compression springs; two guide blocks A symmetrically arranged on the outer side of the valve plug A respectively slide in two guide grooves A on two guide rails in the cavity A. The cooperation of the guide block A and the guide groove A plays a role in guiding the movement of the valve plug A in the cavity A. The trigger block is fixed in the middle of the corresponding sealing ring through four fixing rods A which are distributed in the circumferential direction; the tail end of the pull rod A is provided with a rack A, and a rack B opposite to the movement direction of the rack A is fixed on the circular tube; the rack a and the rack B are simultaneously engaged with a gear mounted in the cavity B by two supports.

As a further improvement of the technology, an oil injection pipe B is installed on the outer side of an oil injection port A of the square rod, and the oil injection pipe B facilitates the access of an external oil pipe. The pull rod B slides in a sliding groove A at the upper end of the valve plug B, and a sliding block B fixedly connected with the pull rod B slides in a ring groove B on the inner wall of the sliding groove A. The slider B ensures relative movement between the pull rod B and the valve plug B. The spring C is positioned in the ring groove B; the spring C is a compression spring; one end of the spring C is connected with the inner wall of the ring groove B, and the other end of the spring C is connected with the sliding block B; a pull rod C is fixed at the lower end of the valve plug B, and a guide sleeve A which is nested on the pull rod C and is in sliding fit with the pull rod C is fixed in the discharging and injecting channel through four circumferential fixing plates A; the spring E nested in the pull rod C is positioned in the annular groove C on the inner wall of the guide sleeve A. The guide sleeve A provides a motion track for the pull rod C. The spring E is a compression spring; one end of the spring E is connected with the inner wall of the annular groove C, and the other end of the spring E is arranged on the inner wall of the annular groove C; the compression spring ring A on the pull rod C is connected; the pull rod B slides in the sliding groove B on the side wall of the oil filling pipe B. The sliding groove B provides a moving track for the pull rod C.

As a further improvement of the technology, the valve plug B and the valve plug C are connected into a whole through a connecting rod; the guide sleeve B which is nested on the ejector rod A and is in sliding fit with the ejector rod A is fixed in the injection discharging channel through four circumferential fixing plates B. The guide sleeve B provides a motion track for the ejector rod A. The mandril A slides in the chute C at the upper end of the valve plug C; the spring F is positioned in the annular groove D on the inner wall of the sliding groove C; the spring F is a compression spring; one end of the spring F is connected with the inner wall of the annular groove D, and the other end of the spring F is connected with a compression spring ring B arranged on the ejector rod A; the end surface of the valve plug D is provided with a mandril B; and a guide sleeve C which is nested on the ejector rod B and is in sliding fit with the ejector rod B is fixed in the injection discharging channel through two fixing plates C. The guide sleeve C provides a motion track for the ejector rod B. The spring G is positioned in the annular groove E on the inner wall of the guide sleeve C; the spring G is a compression spring; one end of the spring G is connected with the inner wall of the annular groove E, and the other end of the spring G is connected with a compression spring ring C arranged on the ejector rod B.

As a further improvement of the technology, siphon holes are uniformly and densely distributed at the bottom of the oil discharge pipe along the length direction of the oil discharge pipe. The distance between the orifice of the siphon hole and the bottom in the transformer oil tank is 0.5 cm, and the distance can ensure that the siphon hole can completely and effectively adsorb the transformer oil at the bottom while the transformer oil at the bottom of the transformer oil tank is effectively adhered to the bottom of the oil discharge pipe. The clamping block is movable in a movable groove on the side wall of the square rod; two trapezoidal guide strips are symmetrically installed on the square rod and respectively slide in two trapezoidal guide grooves in the side wall of the transformer oil tank. The trapezoidal guide groove and the trapezoidal guide strip are matched to play a role in guiding the vertical movement of the square rod on the side wall of the transformer oil tank.

As a further improvement of the technology, the telescopic rod consists of an outer sleeve and an inner rod which are sleeved with each other; the spring D is positioned in the outer sleeve; two guide blocks B symmetrically arranged on the inner rod slide in two guide grooves B on the inner wall of the outer sleeve respectively. The cooperation of guide block B and guide way B plays the guide effect to the motion of interior pole in the overcoat, guarantees simultaneously that interior pole can not break away from the overcoat under the effect of spring D. The spring D is a compression spring; one end of the spring D is connected with the inner wall of the outer sleeve, and the other end of the spring D is connected with the end face of the inner rod; the outer sleeve is fixed at the tail end of the horizontal section of the L-shaped pull rod B; the tail end of the inner rod matched with the clamping block is provided with two acting inclined planes matched with the outer circular conical surface B on the sealing ring in the oil injection valve mechanism or the oil discharge valve mechanism. The acting inclined plane can ensure that the inner rod of the telescopic rod does not scratch a sealing ring in the oil discharge valve mechanism or the oil injection valve mechanism when the sealing ring and the inner rod interact.

As a further improvement of the present technology, the axial length of the sealing ring in the oil injection valve mechanism is smaller than the axial length of the sealing ring in the oil discharge valve mechanism, and the axial depth of the sealing groove a is smaller than the axial depth of the sealing groove B, so as to ensure that the oil discharge valve mechanism is in a closed state when the sealing ring thereon is matched with the sealing groove a, the oil injection valve mechanism is in an open state when the sealing ring thereon is matched with the sealing groove B, the oil injection valve mechanism is in an open state when the sealing ring thereon is matched with the sealing groove a, and the oil discharge valve mechanism is in an open state when the sealing ring thereon is matched with the sealing groove B.

Compared with the traditional oil-immersed transformer, the oil discharging and injecting mechanism provided by the invention serves as an oil discharging channel when an oil tank of the transformer needs oil discharging, serves as an oil injecting channel when oil is injected, can replace the traditional auxiliary oil injecting or oil discharging oil pipe, and is simple to operate. The discharging and injecting mechanism is matched with the oil filling valve mechanism and the oil discharging valve mechanism when the transformer works normally, the oil filling valve mechanism is in an open state, the oil discharging valve mechanism is in a closed state, the discharging and injecting mechanism serves as a temporary small-capacity oil storage container, transformer oil in a transformer oil tank can flow into the discharging and injecting mechanism through the opened oil filling valve mechanism when the external air temperature rises, and the transformer oil stored in the discharging and injecting mechanism flows back into the transformer oil tank by moving the discharging and injecting mechanism upwards when the external air temperature recovers, so that the micro-regulation of the liquid level of the transformer oil in the transformer oil tank is completed, the regulating efficiency is high, and the operation is simple and not complicated. In addition, the oil discharging mechanism does not need a switch valve when being matched with the oil filling valve mechanism to fill oil into the transformer oil tank and when being matched with the oil discharging valve mechanism to discharge oil out of the transformer oil tank, so that the efficiency of filling oil into the transformer oil tank and discharging oil out of the transformer oil tank is improved, and the operation is more convenient. The invention has simple structure and better use effect.

Drawings

FIG. 1 is a schematic cross-sectional view of the present invention and its entirety.

FIG. 2 is a schematic cross-sectional view of the fill valve mechanism in cooperation with the drain mechanism.

Fig. 3 is a schematic sectional view of the combination of the oil drain valve mechanism and the drain mechanism.

Fig. 4 is a schematic cross-sectional view of a transformer tank and its associated components.

FIG. 5 is a schematic sectional view of the fill valve mechanism.

Fig. 6 is a schematic sectional view of the oil drain valve mechanism.

FIG. 7 is a schematic partial cross-sectional view of the fill valve mechanism or the drain valve mechanism.

Fig. 8 is a cross-sectional view of the valve housing.

FIG. 9 is a schematic cross-sectional view of a valve plug A.

Fig. 10 is a schematic sectional view of the evacuation mechanism.

Fig. 11 is a schematic view of two parts of the drainage mechanism in section.

FIG. 12 is a schematic cross-sectional view of the ejector B, guide sleeve C, valve plug D and ejector C in the discharging mechanism.

Fig. 13 is a schematic cross-sectional view of a square bar from three viewing angles.

FIG. 14 is a schematic sectional view of the filler pipe A, the valve plug B, the guide bush A, the guide bush B, the valve plug C, the valve plug D and the guide bush C.

Fig. 15 is a cross-sectional view of the telescoping pole.

Number designation in the figures: 1. a transformer tank; 4. mounting grooves; 5. a trapezoidal guide groove; 6. a clamping block; 7. an oil filling valve mechanism; 8. an oil discharge valve mechanism; 9. a valve housing; 10. a cavity A; 11. an oil through opening A; 12. a cavity B; 13. an oil through hole B; 14. an oil through hole C; 15. an inner conical surface A; 16. a valve plug A; 17. a circular groove A; 18. a ring groove A; 19. an outer conical surface A; 20. a guide block A; 21. a guide rail; 22. a guide groove A; 23. a slide block A; 24. a spring A; 25. a pull rod A; 26. a rack A; 27. a gear; 28. a support; 29. a rack B; 30. a circular tube; 31. a ring sleeve A; 32. a spring B; 33. a seal ring; 34. an outer conical surface B; 35. a trigger block; 36. fixing the rod A; 37. a discharging and injecting mechanism; 38. a square bar; 39. a drainage and injection channel; 40. an oil discharge port A; 41. an inner conical surface B; 42. an oil filling port A; 43. an inner conical surface C; 44. an oil filling port B; 45. an inner conical surface D; 46. a sealing groove A; 47. an inner conical surface E; 48. an oil discharge port B; 49. a sealing groove B; 50. an inner conical surface F; 51. a movable groove; 52. a trapezoidal conducting bar; 53. a valve plug B; 54. a chute A; 55. a ring groove B; 56. an outer conical surface C; 57. a slide block B; 58. a spring C; 59. a pull rod B; 60. a telescopic rod; 61. a jacket; 62. a guide groove B; 63. an inner rod; 64. an acting bevel; 65. a guide block B; 66. a spring D; 67. an oil filling pipe B; 68. a chute B; 69. a pull rod C; 70. a spring E; 71. a compression spring ring A; 72. a guide sleeve A; 73. a ring groove C; 74. fixing a plate A; 75. a connecting rod; 76. a mandril A; 77. a guide sleeve B; 78. a fixing plate B; 79. a valve plug C; 80. a chute C; 81. a ring groove D; 82. an outer conical surface D; 83. a spring F; 84. a compression spring ring B; 85. a guide sleeve C; 86. a ring groove E; 87. a fixing plate C; 88. a mandril B; 89. a spring G; 90. a compression spring ring C; 91. a valve plug D; 92. an outer conical surface E; 93. a mandril C; 94. a slat; 95. an oil filling pipe A; 96. an oil discharge pipe; 97. a siphon hole.

Detailed Description

The drawings are schematic illustrations of the implementation of the present invention to facilitate understanding of the principles of structural operation. The specific product structure and the proportional size are determined according to the use environment and the conventional technology.

As shown in fig. 1 and 4, it comprises a transformer oil tank 1, a filling valve mechanism 7, an oil discharge valve mechanism 8, and an oil discharge mechanism 37, wherein the filling valve mechanism 7 communicating with the top end inside the transformer oil tank 1 through a filling pipe a95 and the oil discharge valve mechanism 8 communicating with the bottom inside the transformer oil tank 1 through a horizontal oil discharge pipe 96 are respectively installed in two installation grooves 4 outside the transformer oil tank 1, so that the sealing rings 33 in the filling valve mechanism 7 or the oil discharge valve mechanism 8 can be effectively matched with the sealing grooves a46 and B49 on the side walls of the square rod 38 and the square rod 38 of the oil discharge mechanism 37. As shown in fig. 1, 2 and 3, a discharge valve mechanism 37 matched with the oil filling valve mechanism 7 and the oil discharge valve mechanism 8 is vertically and slidably matched with the side wall of the transformer oil tank 1; as shown in fig. 5 and 6, the oil filling valve mechanism 7 and the oil discharge valve and mechanism are identical in structure; as shown in fig. 1, 2, 3, when oil is discharged, the oil discharge valve mechanism 8 is opened, and the drain mechanism 37 serves as an oil discharge passage; when filling oil, the oil discharge valve mechanism 8 is closed, the oil filling valve mechanism 7 is opened, and the oil filling mechanism 37 serves as an oil filling passage.

As shown in fig. 5, the oil filling valve mechanism 7 comprises a valve housing 9, a valve plug a16, a spring a24, a pull rod a25, a circular tube 30, a spring B32 and a sealing ring 33, wherein as shown in fig. 5 and 8, the valve housing 9 is internally provided with a cavity a10 and a cavity B12 which are communicated through an oil through hole C14; an oil through hole A11 in the end wall of the cavity A10 is communicated with an oil filling pipe A95, and a circular pipe 30 axially slides in an oil through hole B13 in the end wall of the cavity B12; a spring B32 which resets the round tube 30 is arranged in the cavity B12; a valve plug A16 which opens and closes an oil through port C14 is axially moved in the cavity A10, a pull rod A25 which is in transmission connection with the circular pipe 30 is axially moved in a circular groove A17 on the end face of the valve plug A16, and a spring A24 which relatively resets the valve plug A16 and the pull rod A25 is arranged in the circular groove A17; the end of the barrel 30 is fitted with a sealing ring 33 which cooperates with a drainage means 37.

As shown in fig. 10 and 11, the discharging mechanism 37 includes a square rod 38, a valve plug B53, a spring C58, a pull rod B59, an expansion rod 60, a spring D66, a spring E70, a ram a76, a valve plug C79, a spring F83, a spring G89, a valve plug D91, and a ram C93, wherein as shown in fig. 1, 10, and 13, a discharging passage 39 is provided in the square rod 38 vertically sliding on the outer side wall of the transformer tank 1, and a valve plug B53 for opening and closing an oil filling port a42 at the upper end of the discharging passage 39 and a valve plug C79 for opening and closing an oil discharging port a40 at the lower end of the discharging passage 39 vertically move; the vertically moving pull rod B59 is in sliding fit with the valve plug B53, and a return spring C58 is arranged between the valve plug B53 and the pull rod B59; a spring E70 for returning the valve plug B53 is arranged in the exhaust injection passage 39; a push rod A76 fixedly connected with a valve plug B53 is in sliding fit with a valve plug C79, and a reset spring F83 is arranged between the valve plug C79 and the push rod A76; as shown in fig. 2, 3 and 11, the exposed end of the pull rod B59 is provided with a horizontal telescopic rod 60 which is matched with a fixture block 6 on the side wall of the transformer oil tank 1 when the oil discharging mechanism 37 is used as an oil discharging channel; the telescopic rod 60 is internally provided with a spring D66 for telescopically restoring the telescopic rod.

As shown in fig. 2 and 13, the side wall of the drain passage 39 has a seal groove B49 at the oil discharge port B48 for engaging with the seal ring 33 of the oil filling valve mechanism 7 or the oil discharge valve mechanism 8; as shown in fig. 3 and 13, the side wall of the discharge passage 39 has a seal groove a46 at the oil port B44 for engaging with the seal ring 33 of the oil filling valve mechanism 7 or the oil discharge valve mechanism 8; as shown in fig. 5, 11 and 12, a valve plug D91 for opening and closing the oil filler B44 is horizontally moved in the drain passage 39 and a spring G89 for returning the valve plug D91 is installed; a push rod C93 is arranged in the middle of the end face of the valve plug D91, and the push rod C93 is matched with a trigger block 35 which is fixed in the middle of a sealing ring 33 of the oil injection valve mechanism 7 and does not block the circular pipe 30; as shown in fig. 1, the lower end of the square rod 38 is fitted with a strip 94 which engages with the seal ring 33 of the oil drain valve mechanism 8.

As shown in fig. 6, 8 and 9, the inner wall of the oil through port C14 has an inner conical surface a15 matched with the outer conical surface a19 at the end of the corresponding valve plug a16, so that the sealing contact area between the valve plug a16 and the oil through port C14 is increased, and at the same time, the valve plug a16 can be effectively restrained at the oil through port C14 without moving, thereby achieving better sealing effect. As shown in fig. 5 and 13, the inner wall of the sealing groove a46 has an inner conical surface E47, and the inner conical surface E47 cooperates with an outer conical surface B34 at the end of the sealing ring 33 in the oil filling valve mechanism 7, so as to ensure that the sealing ring 33 can freely enter and exit from the sealing groove a46 when the square rod 38 moves vertically while achieving effective sealing between the sealing ring 33 and the oil filling port B44. The inner wall of the sealing groove B49 is provided with an inner conical surface F50, and the inner conical surface F50 is matched with an outer conical surface B34 at the end part of a sealing ring 33 in the oil filling valve mechanism 7 or the oil discharging valve mechanism 8, so that effective sealing of the sealing ring 33 and an oil discharging port B48 is achieved, and meanwhile, the sealing ring 33 can freely enter and exit from the sealing groove B49 when the square rod 38 moves vertically. As shown in fig. 12, 13 and 14, the external conical surface E92 of the end of the valve plug D91 is matched with the internal conical surface D45 of the inner wall of the oil filling port B44, so that the sealing contact area of the valve plug D91 and the oil filling port B44 is increased, and the valve plug D91 can be effectively restrained at the oil filling port B44 without moving, thereby achieving better sealing effect. As shown in fig. 11, 13 and 14, the outer conical surface C56 of the end portion of the valve plug B53 is matched with the inner conical surface C43 of the inner wall of the oil filling port a42, so that the sealing contact area of the valve plug B53 and the oil filling port a42 is increased, and simultaneously, the valve plug B53 can be effectively restrained at the oil filling port a42 without movement, thereby achieving better sealing effect. The outer circular conical surface D82 of valve plug C79 tip cooperates with the interior circular conical surface B41 of oil drain A40 inner wall to can restrain valve plug C79 in oil drain A40 department and not take place to remove effectively at increase valve plug C79 and oil drain A40's sealed area of contact simultaneously, thereby reach better sealed effect.

As shown in fig. 5 and 6, the spring B32 is a compression spring; one end of the spring B32 is connected with the inner wall of the cavity B12, and the other end is connected with a ring sleeve A31 arranged on the corresponding round tube 30; as shown in fig. 6 and 9, a sliding block a23 fixedly connected with a pull rod a25 slides in a ring groove a18 on the inner wall of the circular groove a 17. The slider a23 ensures relative movement between the tie rod a25 and the valve plug a 16. One end of the spring A24 is connected with the sliding block A23, and the other end of the spring A24 is connected with the inner wall of the annular groove A18; both spring A24 and spring B32 are compression springs; as shown in fig. 5 and 6, two guide blocks a20 symmetrically mounted on the outer sides of the valve plugs a16 slide in two guide grooves a22 of two guide rails 21 in the cavity a10, respectively. The engagement of the guide block a20 with the guide slot a22 guides the movement of the valve plug a16 within the cavity a 10. The trigger block 35 is fixed in the middle inside the corresponding sealing ring 33 through four fixing rods A36 distributed circumferentially; as shown in fig. 5, 6 and 7, a rack a26 is arranged at the tail end of the pull rod a25, and a rack B29 opposite to the movement direction of the rack a26 is fixed on the circular tube 30; rack a26 and rack B29 simultaneously engage a gear 27 mounted in chamber B12 by two standoffs 28.

As shown in fig. 11 and 13, a filling pipe B67 is arranged outside the filling port a42 of the square rod 38, and the filling pipe B67 facilitates the access of an external oil pipe. As shown in fig. 11 and 14, the pull rod B59 slides in the slide groove a54 at the upper end of the valve plug B53, and a slide block B57 fixedly connected with the pull rod B59 slides in the annular groove B55 at the inner wall of the slide groove a 54. The slider B57 ensures relative movement between the drawbar B59 and the valve plug B53. The spring C58 is positioned in the ring groove B55; the spring C58 is a compression spring; one end of the spring C58 is connected with the inner wall of the ring groove B55, and the other end is connected with the sliding block B57; a pull rod C69 is fixed at the lower end of the valve plug B53, and a guide sleeve A72 which is nested on the pull rod C69 and is in sliding fit with the pull rod C69 is fixed in the injection channel 39 through four circumferential fixing plates A74; the spring E70 nested in the pull rod C69 is positioned in a ring groove C73 on the inner wall of the guide sleeve A72. The guide sleeve A72 provides a moving track for the pull rod C69. The spring E70 is a compression spring; one end of the spring E70 is connected with the inner wall of the ring groove C73, and the other end is mounted on the ring groove C73; a compression spring ring A71 on the pull rod C69 is connected; the pull rod B59 slides in the slide groove B68 on the side wall of the filler pipe B67. The sliding groove B68 provides a moving track for the pull rod C69.

As shown in fig. 10, 11 and 13, the valve plug B53 and the valve plug C79 are connected into a whole through a connecting rod 75; the guide sleeve B77 which is nested on the ejector rod A76 and is in sliding fit with the ejector rod A76 is fixed in the injection discharging channel 39 through four circumferential fixing plates B78. The guide sleeve B77 provides a motion track for the ejector rod A76. The mandril A76 slides in the slide groove C80 at the upper end of the valve plug C79; the spring F83 is positioned in a ring groove D81 on the inner wall of the chute C80; the spring F83 is a compression spring; one end of a spring F83 is connected with the inner wall of the ring groove D81, and the other end of the spring F83 is connected with a compression spring ring B84 arranged on the ejector rod A76; the end surface of the valve plug D91 is provided with a mandril B88; the guide sleeve C85 which is nested on the ejector rod B88 and is in sliding fit with the ejector rod B88 is fixed in the injection discharging channel 39 through two fixing plates C87. The guide sleeve C85 provides a moving track for the ejector rod B88. The spring G89 is positioned in a ring groove E86 on the inner wall of the guide sleeve C85; the spring G89 is a compression spring; one end of the spring G89 is connected with the inner wall of the ring groove E86, and the other end is connected with a compression spring ring C90 arranged on the ejector rod B88.

As shown in fig. 3, 4 and 10, siphon holes 97 are uniformly and densely distributed at the bottom of the oil discharge pipe 96 along the length direction thereof. The distance between the orifice of the siphon hole 97 and the bottom in the transformer oil tank 1 is 0.5 cm, and the distance can ensure that the siphon hole 97 can completely and effectively adsorb the transformer oil at the bottom while the transformer oil at the bottom of the transformer oil tank 1 is effectively adhered to the bottom of the oil discharge pipe 96. The fixture block 6 is movable in a movable groove 51 on the side wall of the square rod 38; two trapezoidal guide bars 52 are symmetrically installed on the square bar 38, and the two trapezoidal guide bars 52 respectively slide in the two trapezoidal guide grooves 5 on the side wall of the transformer oil tank 1. The matching of the trapezoidal guide groove 5 and the trapezoidal guide strip 52 plays a role in guiding the vertical movement of the square rod 38 on the side wall of the transformer oil tank 1.

As shown in fig. 2, 11 and 15, the telescopic rod 60 is composed of an outer sleeve 61 and an inner rod 63 which are sleeved with each other; spring D66 is located in housing 61; the two guide blocks B65 symmetrically arranged on the inner rod 63 slide in the two guide grooves B62 on the inner wall of the outer sleeve 61 respectively. The cooperation of the guide block B65 and the guide slot B62 guides the movement of the inner lever 63 within the outer sleeve 61 while ensuring that the inner lever 63 does not disengage from the outer sleeve 61 under the action of the spring D66. The spring D66 is a compression spring; one end of the spring D66 is connected with the inner wall of the outer sleeve 61, and the other end is connected with the end surface of the inner rod 63; the outer sleeve 61 is fixed at the end of the horizontal section of the L-shaped pull rod B59; the end of the inner rod 63 engaging with the latch 6 has two inclined surfaces 64 for engagement with the outer circular conical surface B34 of the seal ring 33 in the fill valve mechanism 7 or the drain valve mechanism 8. The inclined operating surface 64 ensures that the inner rod 63 of the telescopic rod 60 does not scratch the sealing ring 33 in the drain valve mechanism 8 or the fill valve mechanism 7 when the sealing ring 33 interacts with the inner rod 63.

As shown in fig. 5 and 6, the axial length of the seal ring 33 in the oil filling valve mechanism 7 is smaller than the axial length of the seal ring 33 in the oil discharging valve mechanism 8, the axial depth of the seal groove a46 is smaller than the axial depth of the seal groove B49, so that the oil discharging valve mechanism 8 is in a closed state when the seal ring 33 thereon is engaged with the seal groove a46, the oil filling valve mechanism 7 is in an open state when the seal ring 33 thereon is engaged with the seal groove B49, the oil filling valve mechanism 7 is in an open state when the seal ring 33 thereon is engaged with the seal groove a46, and the oil discharging valve mechanism 8 is in an open state when the seal ring 33 thereon is engaged with the seal groove B49.

The working process of the invention is as follows: as shown in fig. 1, 2, and 3, in the initial state, the seal ring 33 of the fill valve mechanism 7 is in sealing engagement with the seal groove B49 on the square rod 38, and the fill valve mechanism 7 is in the open state. Both the spring a24 and the spring B32 in the fill valve mechanism 7 are in a compressed state. The seal ring 33 in the drain valve mechanism 8 is in sealing engagement with the seal groove a46 on the square rod 38 of the drain mechanism 37, and the drain valve mechanism 8 is in a closed state. Both the spring a24 and the spring B32 in the oil drain valve mechanism 8 are in a compressed state. Valve plug B53 in discharge mechanism 37 is in an open state for fill port a42, valve plug C79 is in a closed state for drain port a40, and valve plug D91 is in a closed state for fill port B44. The spring C58, the spring D66, the spring E70, the spring F83, and the spring G89 in the discharging mechanism 37 are all in a compressed state.

In the initial state, the transformer oil in the transformer oil tank 1 is in a full tank state, the liquid level is flush with the top of the oil filling pipe A95, and the discharging and filling passage 39 of the square rod 38 of the discharging and filling mechanism 37 stores a proper amount of transformer oil.

When the transformer oil level in the transformer oil tank 1 rises due to the rise of the outside air temperature, the transformer oil in the transformer oil tank 1 enters the discharging and injecting passage 39 in the square rod 38 of the discharging and injecting mechanism 37 through the opened oil filling valve mechanism 7 and the opened oil outlet B48 and is temporarily stored, so that the transformer oil amount in the transformer oil tank 1 is slightly adjusted in an adaptive manner, manual participation is not needed, and the efficiency is high.

When the level of the transformer oil in the transformer oil tank 1 is lowered due to the decrease of the outside air temperature, the transformer oil must be supplemented into the transformer oil tank 1 in order to ensure the normal operation of the transformer. Or when oil needs to be filled into the empty transformer oil tank 1 before the transformer is used, the draining mechanism 37 needs to be manually pushed vertically upwards.

In the process of pushing the discharging mechanism 37 vertically and upwards, the sealing ring 33 in the oil filling valve mechanism 7 slides out of the sealing groove B49 under the interaction of the outer conical surface B34 and the inner conical surface F50 of the sealing groove B49 and finally abuts against the side wall of the square rod 38, the sealing ring 33 of the oil filling valve mechanism 7 drives the valve plug a16 to close the oil through hole C14 on the end face of the valve housing 9 of the oil filling valve mechanism 7 through the corresponding circular tube 30, the rack B29, the gear 27, the rack a26, the pull rod a25, the slider a23 and the spring a24, the spring a24 and the spring a24 are both further compressed, and the circular tube 30 further compresses the spring B32 through the ring sleeve a 31. Meanwhile, the sealing ring 33 in the oil drain valve mechanism 8 slides out of the sealing groove a46 under the interaction of the outer conical surface B34 and the inner conical surface E47 of the sealing groove a46 and finally abuts against the side wall of the square rod 38, the sealing ring 33 of the oil drain valve mechanism 8 drives the valve plug a16 to close the oil through opening C14 on the end face of the valve housing 9 of the oil drain valve mechanism 8 through the corresponding circular tube 30, the rack B29, the gear 27, the rack a26, the pull rod a25, the slider a23 and the spring a24, the spring a24 is further compressed, and the circular tube 30 further compresses the spring B32 through the ring sleeve a 31.

The sealing ring 33 of the oil drain valve mechanism 8 continues to interact with the lath 94 at the lower end of the square rod 38 after the sealing ring 33 is separated from the square rod 38, and the sealing ring 33 of the oil drain valve mechanism 8 drives the valve plug a16 in the oil drain valve mechanism 8 to close the oil through opening C14 of the valve housing 9 of the oil drain valve mechanism 8 through a series of transmissions all the time during the process that the square rod 38 moves vertically upwards.

When the sealing ring 33 of the oil filling valve mechanism 7 starts to enter the range of the sealing groove A46, the sealing ring 33 of the oil filling valve mechanism 7 enters the sealing groove A46 along the inner conical surface E47 of the sealing groove A46 under the reset action of the corresponding spring B32 and finally completes sealing fit with the sealing groove A46, meanwhile, the ejector rod C93 in the oil filling opening B44 interacts with the trigger block 35 in the sealing ring 33 of the oil filling valve mechanism 7, the ejector rod C93 drives the valve plug D91 to open the oil filling opening B44 on the side wall of the square rod 38, and the spring G89 is further compressed. The transformer oil stored in the discharging and injecting passage 39 enters the transformer oil tank 1 through the opened oil filling port B44 and the opened oil filling valve mechanism 7, so that the transformer oil in the transformer oil tank 1 is supplemented, the normal operation of the transformer is not influenced by the reduction of the outside air temperature, and at the moment, the discharging and injecting mechanism 37 serves as an oil filling pipeline.

If oil is injected into the transformer tank 1, the oil is injected into the transformer tank 1 through the discharging mechanism 37 serving as an oil injection pipeline at this time.

After the transformer oil is supplemented or added into the transformer oil tank 1, the discharging and filling mechanism 37 is manually reset vertically and downwards. During the resetting process of the discharging and filling mechanism 37, the sealing ring 33 of the filling valve mechanism 7 slides out of the sealing groove a46 under the action of the inner conical surface E47 in the sealing groove a46 and finally abuts against the side wall of the square rod 38, and the sealing ring 33 of the filling valve mechanism 7 drives the corresponding valve plug a16 to close the oil through hole C14 on the valve housing 9 of the filling valve mechanism 7 through a series of transmissions. The ejector C93 in the discharging mechanism 37 is separated from the trigger block 35, and the valve plug D91 is closed to the oil filling port B44 on the side wall of the counter rod 38 under the reset action of the spring G89.

When the sealing groove A46 on the square rod 38 is opposite to the sealing ring 33 of the oil discharge valve mechanism 8, the sealing ring 33 in the oil discharge valve mechanism 8 is in sealing fit with the sealing groove A46 under the reset action of the corresponding spring B32, the sealing groove B49 on the square rod 38 is just opposite to the sealing ring 33 of the oil injection valve mechanism 7, and the sealing ring 33 in the oil injection valve mechanism 7 is in sealing fit with the sealing groove B49 under the reset action of the corresponding spring B32. The valve plug a16 in the fill valve mechanism 7 is opened again to the oil port C14 on the corresponding valve housing 9, and the valve plug a16 in the drain valve mechanism 8 is closed again to the oil port C14 on the corresponding valve housing 9.

When the transformer oil in the transformer oil tank 1 needs to be completely drained, the manual pushing and draining mechanism 37 moves vertically and downwards.

In the process of vertically pushing the discharging mechanism 37 downwards, the sealing ring 33 in the oil filling valve mechanism 7 slides out of the sealing groove B49 under the interaction of the outer conical surface B34 and the inner conical surface F50 of the sealing groove B49 and finally abuts against the side wall of the square rod 38, the sealing ring 33 of the oil filling valve mechanism 7 drives the valve plug a16 to close the oil through hole C14 on the end face of the valve housing 9 of the oil filling valve mechanism 7 through the corresponding circular tube 30, the rack B29, the gear 27, the rack a26, the pull rod a25, the slider a23 and the spring a24, the spring a24 is further compressed, and the circular tube 30 further compresses the spring B32 through the ring sleeve a 31. Meanwhile, the sealing ring 33 in the oil drain valve mechanism 8 slides out of the sealing groove a46 under the interaction of the outer conical surface B34 and the inner conical surface E47 of the sealing groove a46 and finally abuts against the side wall of the square rod 38, the sealing ring 33 of the oil drain valve mechanism 8 drives the valve plug a16 to close the oil through opening C14 on the end face of the valve housing 9 of the oil drain valve mechanism 8 through the corresponding circular tube 30, the rack B29, the gear 27, the rack a26, the pull rod a25, the slider a23 and the spring a24, the spring a24 is further compressed, and the circular tube 30 further compresses the spring B32 through the ring sleeve a 31.

The sealing ring 33 of the oil filling valve mechanism 7 resets under the resetting action of the corresponding spring B32 after being separated from the square rod 38, the sealing ring 33 drives the valve plug A16 to be completely opened to the oil through port C14 of the corresponding valve casing 9 through a series of transmissions, so that the top in the transformer oil tank 1 is communicated with the atmosphere, and the oil drainage difficulty caused by the fact that a closed space is formed in the oil drainage process in the transformer oil tank 1 is avoided. The sealing ring 33 of the oil discharge valve mechanism 8 drives the valve plug a16 in the oil discharge valve mechanism 8 to close the oil through opening C14 of the valve housing 9 of the oil discharge valve mechanism 8 through a series of transmissions all the time in the process that the square rod 38 moves vertically downwards.

When the sealing ring 33 of the oil drain valve mechanism 8 starts to enter the range of the sealing groove B49, the sealing ring 33 of the oil drain valve mechanism 8 enters the sealing groove B49 along the inner conical surface F50 of the sealing groove B49 under the reset action of the corresponding spring B32 and finally completes sealing engagement with the sealing groove B49, and the sealing ring 33 drives the corresponding valve plug a16 to completely open the oil through port C14 in the corresponding valve housing 9 through a series of transmissions. Meanwhile, the telescopic rod 60 in the injection discharging mechanism 37 is closed by the draw bar B59, the slide block B57 and the spring C58 through the draw bar B59, the slide block B57 and the spring C58 until the valve plug B53 closes the oil filling port A42 at the upper end of the square rod 38, and the spring C58 and the spring E70 are further compressed. The valve plug B53 drives the valve plug C79 to fully open the oil drain A40 at the lower end of the counter rod 38 through the connecting rod 75, the ejector rod A76 and the spring F83.

The transformer oil in the transformer oil tank 1 is discharged through the opened oil discharge valve mechanism 8, the oil discharge port B48 and the opened oil discharge port a40 in sequence, so that the transformer oil in the transformer oil tank 1 is discharged.

In the vertical downward movement and vertical upward resetting processes of the square rod 38, the telescopic rod 60 can stretch and retract due to the interaction of the inner rod 63 of the telescopic rod and the outer conical surface B34 of the sealing ring 33 of the oil filling valve mechanism 7, so that the oil filling valve mechanism 7 is ensured not to obstruct the vertical movement of the square rod 38 of the telescopic rod 60.

After the transformer oil in the transformer oil tank 1 is drained, the discharging and filling mechanism 37 is manually reset vertically and upwards. During the resetting process of the oil discharge valve mechanism 37, the sealing ring 33 of the oil discharge valve mechanism 8 slides out of the sealing groove B49 under the action of the inner conical surface F50 in the sealing groove B49 and finally abuts against the side wall of the square rod 38, and the sealing ring 33 of the oil discharge valve mechanism 8 drives the corresponding valve plug a16 to close the oil through port C14 in the valve housing 9 of the oil discharge valve mechanism 8 through a series of transmissions. The pull rod C69 resets for guide pin bushing A72 under spring E70 reset effect, and pull rod C69 drives valve plug B53 and opens oiling mouth A42, and valve plug B53 drives telescopic link 60 through spring C58, slider B57 and pull rod B59 and has the vertical reset of square bar 38 relatively. At the same time, the pull rod C69 drives the valve plug C79 to close the oil drain port a40 at the lower end of the counter rod 38 through the connecting rod 75, the ejector rod a76 and the spring F83, and the spring F83 is further compressed.

When the sealing groove A46 on the square rod 38 is opposite to the sealing ring 33 of the oil discharge valve mechanism 8, the sealing ring 33 in the oil discharge valve mechanism 8 is in sealing fit with the sealing groove A46 under the reset action of the corresponding spring A24, the sealing groove B49 on the square rod 38 is just opposite to the sealing ring 33 of the oil injection valve mechanism 7, and the sealing ring 33 in the oil injection valve mechanism 7 is in sealing fit with the sealing groove B49 under the reset action of the corresponding spring A24. The valve plug a16 in the fill valve mechanism 7 is opened again to the oil port a11 on the corresponding valve housing 9, and the valve plug a16 in the drain valve mechanism 8 is closed again to the oil port a11 on the corresponding valve housing 9. In the process, the plunger C93 does not interact with the sealing ring 33 in the oil drain valve mechanism 8, and the valve plug D91 is closed to the oil filling port B44 on the side wall of the counter rod 38 under the action of the spring G89.

When the transformer oil in the transformer oil tank 1 is removed and is close to the tail sound, the transformer oil at the bottom in the transformer oil tank 1 is still adhered to the bottom of the oil discharge pipe 96 due to the self tension, and the siphon hole 97 at the bottom of the oil discharge pipe 96 sucks up the transformer oil at the bottom in the transformer oil tank 1 under the siphon action, and finally the transformer oil in the transformer oil tank 1 is discharged completely.

In conclusion, the beneficial effects of the invention are as follows: the oil draining mechanism 37 in the invention serves as an oil draining channel when the transformer oil tank 1 needs oil draining, and serves as an oil filling channel when oil is filled, so that the traditional auxiliary oil filling or oil draining pipe can be replaced, and the operation is simple. The discharging and injecting mechanism 37 is matched with the oil injecting valve mechanism 7 and the oil discharging valve mechanism 8 when the transformer works normally, the oil injecting valve mechanism 7 is in an open state, the oil discharging valve mechanism 8 is in a closed state, the discharging and injecting mechanism 37 serves as a temporary small-capacity oil storage container, transformer oil in the transformer oil tank 1 can flow into the discharging and injecting mechanism 37 through the opened oil injecting valve mechanism 7 when the external air temperature rises, and the transformer oil stored in the discharging and injecting mechanism 37 flows back into the transformer oil tank 1 by moving the discharging and injecting mechanism 37 upwards when the external air temperature recovers, so that the micro-adjustment of the liquid level of the transformer oil in the transformer oil tank 1 is completed, the adjusting efficiency is high, and the operation is simple and not complicated. In addition, the oil injection mechanism 37 of the invention does not need a switch valve when being matched with the oil injection valve mechanism 7 to inject oil into the transformer oil tank 1 and when being matched with the oil discharge valve mechanism 8 to discharge oil out of the transformer oil tank 1, so that the efficiency of injecting oil into the transformer oil tank 1 and discharging oil out is improved, and the operation is more convenient.

Claims

1. An oil-immersed transformer casing which characterized in that: the oil filling valve mechanism communicated with the top end inside the transformer oil tank through an oil filling pipe A and the oil discharging valve mechanism communicated with the bottom inside the transformer oil tank through a horizontal oil discharging pipe are respectively arranged in two mounting grooves on the outer side of the transformer oil tank; the side wall of the transformer oil tank is vertically matched with an oil injection mechanism and an oil discharge mechanism in a sliding manner; the oil filling valve mechanism and the oil discharging valve and the oil filling valve mechanism are the same in structure; when oil is discharged, the oil discharge valve mechanism is opened, and the oil discharge mechanism serves as an oil discharge channel; when oil is filled, the oil discharge valve mechanism is closed, the oil filling valve mechanism is opened, and the oil discharge mechanism serves as an oil filling channel;

the oil injection valve mechanism comprises a valve shell, a valve plug A, a spring A, a pull rod A, a circular pipe, a spring B and a sealing ring, wherein a cavity A and a cavity B which are communicated through an oil through hole C are formed in the valve shell; an oil through opening A on the end wall of the cavity A is communicated with the oil filling pipe A, and a circular pipe axially slides in an oil through opening B on the end wall of the cavity B; a spring B for resetting the circular tube is arranged in the cavity B; a valve plug A for opening and closing the oil through hole C is axially moved in the cavity A, a pull rod A in transmission connection with a circular pipe is axially moved in a circular groove A on the end face of the valve plug A, and a spring A for relatively resetting the valve plug A and the pull rod A is arranged in the circular groove A; the tail end of the circular tube is provided with a sealing ring matched with the discharging and injecting mechanism;

the discharging and injecting mechanism comprises a square rod, a valve plug B, a spring C, a pull rod B, a telescopic rod, a spring D, a spring E, a push rod A, a valve plug C, a spring F, a spring G, a valve plug D and a push rod C, wherein a discharging and injecting channel is arranged in the square rod which vertically slides on the outer side wall of the transformer oil tank, and the valve plug B for switching an oil filling port A at the upper end of the discharging and injecting channel and the valve plug C for switching an oil discharging port A at the lower end of the discharging and injecting channel vertically move; the pull rod B which moves vertically is in sliding fit with the valve plug B, and a reset spring C is arranged between the valve plug B and the pull rod B; a spring E for resetting the valve plug B is arranged in the exhaust and injection channel; the ejector rod A fixedly connected with the valve plug B is in sliding fit with the valve plug C, and a reset spring F is arranged between the valve plug C and the ejector rod A; the exposed end of the pull rod B is provided with a horizontal telescopic rod which is matched with a clamping block on the side wall of the transformer oil tank when the oil discharge mechanism is used as an oil discharge channel; the telescopic rod is internally provided with a spring D for telescopic resetting;

2. An oil filled transformer housing according to claim 1, characterized in that: the inner wall of the oil through opening C is provided with an inner conical surface A matched with the outer conical surface A at the end part of the corresponding valve plug A; the inner wall of the sealing groove A is provided with an inner conical surface E which is matched with an outer conical surface B at the end part of a sealing ring in the oil injection valve mechanism; an inner conical surface F is arranged on the inner wall of the sealing groove B and is matched with an outer conical surface B at the end part of a sealing ring in the oil injection valve mechanism or the oil discharge valve mechanism; the outer conical surface E at the end part of the valve plug D is matched with the inner conical surface D of the inner wall of the oil filling port B; the outer conical surface C of the end part of the valve plug B is matched with the inner conical surface C of the inner wall of the oil filling port A, and the outer conical surface D of the end part of the valve plug C is matched with the inner conical surface B of the inner wall of the oil discharging port A.

3. An oil filled transformer housing according to claim 1, characterized in that: the spring B is a compression spring; one end of the spring B is connected with the inner wall of the cavity B, and the other end of the spring B is connected with the ring sleeve A arranged on the corresponding circular tube; a sliding block A fixedly connected with a pull rod A slides in a ring groove A on the inner wall of the circular groove A; one end of the spring A is connected with the sliding block A, and the other end of the spring A is connected with the inner wall of the annular groove A; the spring A and the spring B are both compression springs; two guide blocks A symmetrically arranged on the outer side of the valve plug A respectively slide in two guide grooves A on two guide rails in the cavity A; the trigger block is fixed in the middle of the corresponding sealing ring through four fixing rods A which are distributed in the circumferential direction; the tail end of the pull rod A is provided with a rack A, and a rack B opposite to the movement direction of the rack A is fixed on the circular tube; the rack a and the rack B are simultaneously engaged with a gear mounted in the cavity B by two supports.

4. An oil filled transformer housing according to claim 1, characterized in that: an oil filling pipe B is arranged on the outer side of the oil filling port A of the square rod; the pull rod B slides in a chute A at the upper end of the valve plug B, and a sliding block B fixedly connected with the pull rod B slides in a ring groove B on the inner wall of the chute A; the spring C is positioned in the ring groove B; the spring C is a compression spring; one end of the spring C is connected with the inner wall of the ring groove B, and the other end of the spring C is connected with the sliding block B; a pull rod C is fixed at the lower end of the valve plug B, and a guide sleeve A which is nested on the pull rod C and is in sliding fit with the pull rod C is fixed in the discharging and injecting channel through four circumferential fixing plates A; a spring E nested in the pull rod C is positioned in a ring groove C on the inner wall of the guide sleeve A; the spring E is a compression spring; one end of the spring E is connected with the inner wall of the annular groove C, and the other end of the spring E is arranged on the inner wall of the annular groove C; the compression spring ring A on the pull rod C is connected; the pull rod B slides in the sliding groove B on the side wall of the oil filling pipe B.

5. An oil filled transformer housing according to claim 1, characterized in that: the valve plug B and the valve plug C are connected into a whole through a connecting rod; the guide sleeve B which is nested on the ejector rod A and is in sliding fit with the ejector rod A is fixed in the injection and discharge channel through four circumferential fixing plates B; the mandril A slides in the chute C at the upper end of the valve plug C; the spring F is positioned in the annular groove D on the inner wall of the sliding groove C; the spring F is a compression spring; one end of the spring F is connected with the inner wall of the annular groove D, and the other end of the spring F is connected with a compression spring ring B arranged on the ejector rod A; the end surface of the valve plug D is provided with a mandril B; a guide sleeve C which is nested on the ejector rod B and is in sliding fit with the ejector rod B is fixed in the injection discharging channel through two fixing plates C; the spring G is positioned in the annular groove E on the inner wall of the guide sleeve C; the spring G is a compression spring; one end of the spring G is connected with the inner wall of the annular groove E, and the other end of the spring G is connected with a compression spring ring C arranged on the ejector rod B.

6. An oil filled transformer housing according to claim 1, characterized in that: siphon holes are uniformly and densely distributed at the bottom of the oil discharge pipe along the length direction of the oil discharge pipe, and the distance between the orifice of each siphon hole and the bottom in the transformer oil tank is 0.5 cm; the clamping block is movable in a movable groove on the side wall of the square rod; two trapezoidal guide strips are symmetrically installed on the square rod and respectively slide in two trapezoidal guide grooves in the side wall of the transformer oil tank.

7. An oil filled transformer housing according to claim 1, characterized in that: the telescopic rod consists of an outer sleeve and an inner rod which are sleeved with each other; the spring D is positioned in the outer sleeve; two guide blocks B symmetrically arranged on the inner rod respectively slide in two guide grooves B on the inner wall of the outer sleeve; the spring D is a compression spring; one end of the spring D is connected with the inner wall of the outer sleeve, and the other end of the spring D is connected with the end face of the inner rod; the outer sleeve is fixed at the tail end of the horizontal section of the L-shaped pull rod B; the tail end of the inner rod matched with the clamping block is provided with two acting inclined planes matched with the outer circular conical surface B on the sealing ring in the oil injection valve mechanism or the oil discharge valve mechanism.

8. An oil filled transformer housing according to claim 1, characterized in that: the axial length of the sealing ring in the oil filling valve mechanism is smaller than that of the sealing ring in the oil discharge valve mechanism; the axial depth of seal groove a is less than the axial depth of seal groove B.