CN110752522A - Motor train unit overhead high-voltage equipment box top cover sealing structure and method - Google Patents
Motor train unit overhead high-voltage equipment box top cover sealing structure and method Download PDFInfo
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- CN110752522A CN110752522A CN201911005517.9A CN201911005517A CN110752522A CN 110752522 A CN110752522 A CN 110752522A CN 201911005517 A CN201911005517 A CN 201911005517A CN 110752522 A CN110752522 A CN 110752522A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/26—Casings; Parts thereof or accessories therefor
- H02B1/46—Boxes; Parts thereof or accessories therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B43/00—Washers or equivalent devices; Other devices for supporting bolt-heads or nuts
- F16B43/001—Washers or equivalent devices; Other devices for supporting bolt-heads or nuts for sealing or insulation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/14—Sealings between relatively-stationary surfaces by means of granular or plastic material, or fluid
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/26—Casings; Parts thereof or accessories therefor
- H02B1/28—Casings; Parts thereof or accessories therefor dustproof, splashproof, drip-proof, waterproof or flameproof
Abstract
The invention relates to a sealing structure and a sealing method for a top cover of a motor train unit overhead high-voltage equipment box, which comprises the following steps: the box body is connected with the top cover in a sealing mode through a fastening piece, an outer ring sealing structure and an inner ring sealing structure are arranged between the top cover and the box body and located on two sides of the fastening piece respectively, and pre-pressure is applied to the outer ring sealing structure and the inner ring sealing structure through the fastening piece to form a double-layer sealing structure. By adopting the sealing structure with the outer ring sealing structure and the inner ring sealing structure respectively arranged on the two sides of the fastener, the proper pre-pressure on the sealing element can be ensured, so that a good sealing effect is realized.
Description
Technical Field
The invention relates to the technical field of rail transit, in particular to a top cover sealing structure and method of a motor train unit overhead high-voltage equipment box.
Background
In order to save space at the bottom of the vehicle body of the rail vehicle, it is a trend to arrange high-voltage equipment on the roof of the vehicle. However, the high-pressure tank is exposed outdoors, which causes a problem that the sealing requirement for the high-pressure tank is high. The general high-voltage equipment box adopts a structure of a box body and a top cover, the top cover is fastened on the box body through bolts, and sealing is realized through sealing rubber strips. The edge of the top cover of the existing structure is adhered with a circle of metal section by using sealant, the structure is complex, the production and manufacturing period is long, the requirement on adhesion is high, if the adhesion is not good, water leakage is easy to occur, and the appearance is not attractive; in addition, the roof equipment is more in arrangement, the operation space is limited, the roof cover needs to be considered to be convenient to overhaul, and the operation is simple; meanwhile, as the requirement for light weight of the vehicle is higher and higher, the weight of the roof needs to be reduced as much as possible. In view of the above, a top cover sealing structure which has a relatively simple structure, a short production period, a stable sealing structure, sufficient strength and light weight is needed to meet the requirement of high-speed motor train units, so that the box body is isolated from the external environment, and the normal operation of the electrical components in the box body is ensured.
Patent documents that have not found the same technology as the present invention by patent search report that the following patents are mainly related to the present invention:
the Chinese invention patent with the application number of CN201811067939.4, the application date of 2018.09.13, the publication number of CN108988164A and the publication number of 2018.12.11, which is named as the sealing structure of the top cover of the high-voltage equipment box arranged on top of the motor train unit and the application of 'New Material science and technology Co., Ltd in the era of Taoism', the invention discloses a top cover sealing structure of a motor train unit overhead high-voltage equipment box, the high-voltage equipment box comprises a box body, a top cover is arranged on the box body, a double-layer sealing structure is adopted between the top cover and the box body, all there is the sealing rubber strip that bonds on box and top cap, and the sealing rubber strip includes that first sealing strip and second say the sealing strip, and near part in top cap edge is the echelonment structure, from outer to interior first order ladder and the second ladder that is higher than first order ladder of including, first sealing strip is located between first order ladder and the box, and the second says that the sealing strip is located between second order ladder and the box. The invention has stable sealing structure, and outside water molecules can not enter the box body when the vehicle runs at high speed. The box body is isolated from the external environment, so that the normal work of the electric elements in the box body is ensured, the rigidity is ensured, meanwhile, the requirement of lightweight design is realized to the maximum extent, and the requirement of the running of the high-speed motor train unit can be met.
However, the first sealing strip and the second sealing strip are positioned on the same side of the fastener, and the distance difference between the two sealing strips and the fastener is large, so that the pre-pressure of the second sealing strip far away from the fastener is smaller than that of the first sealing strip, and the sealing performance of the second sealing strip far away from the fastener is not ideal. If the pre-pressure of the first sealing strip is too large, the reaction force of the top cover on the first sealing strip is also large, and the top cover can be tilted upwards and deformed, so that the top cover cannot be pressed on the second sealing strip, the second sealing strip loses the sealing effect, and the top cover of the overhead high-voltage equipment box of the motor train unit is not sealed tightly.
Disclosure of Invention
The invention aims to solve the technical problem that the top cover of the existing motor train unit overhead high-voltage equipment box is not tightly sealed, and provides a motor train unit overhead high-voltage equipment box top cover sealing structure to improve the sealing performance of the overhead high-voltage equipment box.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the utility model provides a EMUs overhead high-tension apparatus case top cap seal structure, includes: the box body is connected with the top cover in a sealing mode through a fastening piece, an outer ring sealing structure and an inner ring sealing structure are arranged between the top cover and the box body and located on two sides of the fastening piece respectively, and pre-pressure is applied to the outer ring sealing structure and the inner ring sealing structure through the fastening piece to form a double-layer sealing structure.
The double-layer sealing structure can ensure that the outer ring sealing structure and the inner ring sealing structure both bear proper pre-pressure so as to realize good sealing effect and effectively avoid the problem that the second sealing strip loses the sealing effect due to uneven stress of the existing double-layer sealing structure.
Further, the lower surface at top cap edge is the top cap contact surface with the box contact, and the upper surface at box edge is the box contact surface with the top cap contact, the fastener includes: a bolt and a nut; the box body contact surface is provided with a box body bolt hole, the top cover contact surface is provided with a top cover bolt hole, the periphery of the top cover bolt hole is provided with a counter bore, an annular elastic sealing sleeve is arranged in the counter bore, the lower end face of the annular elastic sealing sleeve protrudes out of the top cover contact surface, and when the bolt sequentially penetrates through the top cover bolt hole and the box body bolt hole to be connected with a nut to tightly press the top cover on the box body, the annular elastic sealing sleeve is tightly pressed on the box body contact surface. So as to form an annular sealing surface, the contact surface between the top cover and the box body can be isolated from the top cover bolt hole, and the water flowing along the gap between the top cover bolt hole and the screw rod of the bolt is prevented from entering the contact surface between the top cover and the box body.
Furthermore, a water drainage channel is further arranged on the box body, one end of the water drainage channel is communicated with the bolt hole of the box body, and the other end of the water drainage channel is communicated with the outside. So that the water flowing in along the gap between the bolt hole of the top cover and the screw rod of the bolt continuously flows to the water drainage channel along the gap between the bolt hole of the box body and the screw rod and flows out of the box body through the water drainage channel.
Furthermore, a frame section with a C-shaped section is arranged below the contact surface of the box body, the nut is a nut block, the nut block is arranged in the frame section, a threaded hole is formed in the nut block, and the bolt sequentially penetrates through the top cover bolt hole and the box body bolt hole to be matched and connected with the threaded hole in the nut block; and a gap is reserved between the nut block and the C-shaped frame profile, and the gap is the water drainage channel. The frame section bar arranged below the box contact surface can enhance the rigidity of the box contact surface, and the situation that the bolt fastening position and the non-fastening position are in wavy buckling deformation is avoided.
Further, the outside of the top cover bolt hole on the top cover contact surface is provided with a circle of groove, the groove is embedded with an outer ring sealing ring, the bottom of the outer ring sealing ring is in contact sealing with the box contact surface, and the outer ring sealing structure is formed. The outer ring sealing ring is embedded into the groove to fix the outer ring sealing ring, so that the problem of poor sealing caused by displacement of the outer ring sealing ring is prevented.
Furthermore, a circle of bulges are arranged on the box body contact surface on the inner side of the box body bolt hole, the bulges and the box body contact surface are integrally formed, an inner ring sealing ring is arranged at the top of each bulge, and the top of each inner ring sealing ring is in contact sealing with the top surface of the top cover to form the inner ring sealing structure. The arrangement of the inner ring sealing structure can prevent the sealing performance of the overhead equipment box from being ensured when the outer ring sealing structure fails.
Further, the top position of the inner ring sealing ring is higher than the bottom position of the outer ring sealing ring. And water permeating between the top cover and the box body when the outer ring sealing structure fails is blocked outside the inner ring sealing structure, so that the sealing performance of the overhead equipment box is ensured.
Furthermore, a hinge is arranged between one side edge of the top cover and the box body, the top cover can be opened or closed relative to the box body in a rotating mode, and an air supporting telescopic rod is arranged between the box body and the top cover and used for balancing gravity moment when the top cover is opened. The top cover is prevented from being opened in a lifting mode, so that the maintenance is convenient, the maintenance efficiency is improved, the maintenance time is shortened, and the labor intensity is reduced.
A method for improving the sealing performance of an overhead high-voltage equipment box of a motor train unit comprises the steps of connecting a top cover to a box body in a sealing mode through a fastening piece, arranging an outer ring sealing structure and an inner ring sealing structure at two sides of the fastening piece respectively, and pressing the outer ring sealing structure and the inner ring sealing structure between the top cover and the box body by using the pressing force of the fastening piece when the top cover is pressed on the box body through the fastening piece to form a double-layer sealing structure. The double-layer sealing structure can ensure that the outer ring sealing structure and the inner ring sealing structure both bear proper pre-pressure so as to realize good sealing effect and effectively avoid the problem that the second sealing strip loses the sealing effect due to uneven stress of the existing double-layer sealing structure.
Furthermore, the horizontal position of the sealing surface of the inner ring sealing structure is set to be higher than that of the outer ring sealing structure, and the height difference between the sealing surface of the inner ring sealing structure and the sealing surface of the outer ring sealing structure is utilized to form a blocking structure for the permeated water. And water permeating between the top cover and the box body when the outer ring sealing structure fails is blocked outside the inner ring sealing structure, so that the sealing performance of the overhead equipment box is ensured.
The invention has the beneficial effects that: the sealing structure with the outer ring sealing structure and the inner ring sealing structure is arranged on two sides of the fastener respectively, so that proper pre-pressure on the sealing element is guaranteed, and a good sealing effect is achieved. An annular elastic sealing sleeve is arranged at the position of the top cover bolt hole to form an annular sealing surface, so that water penetrating along the top cover bolt hole flows to the water drainage channel along a gap between the bolt hole and the screw rod and flows out of the box body without entering a contact surface between the top cover and the box body. The frame section bar arranged below the contact surface of the box body enhances the rigidity of the box body, and avoids the wavy warping deformation after the bolt is fastened. The top position of the inner ring sealing ring is higher than the bottom position of the outer ring sealing ring, so that water permeating between the top cover and the box body when the outer ring sealing structure fails can be blocked outside the inner ring sealing structure, and the sealing performance of the overhead equipment box is ensured.
Drawings
FIG. 1 is a schematic top view of a motor train unit overhead equipment box;
FIG. 2 is a schematic sectional view taken along line B-B after the bolt is fastened;
FIG. 3 is a schematic sectional view taken along line B-B before the bolt is fastened;
FIG. 4 is an exploded view of section B-B;
FIG. 5 is a schematic sectional view taken along line A-A;
FIG. 6 is a side partial schematic view of FIG. 5;
FIG. 7 is a schematic front view of a motor train unit overhead equipment box when opened;
FIG. 8 is a schematic cross-sectional view of a portion of a head embedment;
in the figure: the sealing structure comprises a top cover 1, a top cover 11, a top cover contact surface, a groove 12, a counter bore 13, a top cover bolt hole 14, a top cover sealing surface 15, an inner ring sealing surface 16, an enhancement layer 17, a filling layer 18, a metal piece 19, a screw hole 2, a box body 21, a box body contact surface 22, a box body bolt hole 23, a bulge 24, a notch 24, a water drainage gap 25, a nut block mounting notch 26, a bolt 3, a nut block 4, an outer ring sealing ring 5, an annular elastic sealing sleeve 6, an inner ring sealing ring 7, an 8 hinge, a hinge seat 81, a rotating shaft 82, a hinge body 83 and a gas strut telescopic rod 9.
Detailed Description
The invention is further described by the following specific embodiments in conjunction with the attached drawings:
this embodiment is shown in fig. 1 and 2: the utility model provides a EMUs overhead high-tension apparatus case top cap seal structure, includes: the sealing structure comprises a box body 2 and a top cover 1, wherein the top cover 1 is connected to the box body 2 in a sealing mode through a fastening piece, an outer ring sealing structure and an inner ring sealing structure are arranged between the top cover 1 and the box body 2 and located on two sides of the fastening piece respectively, and pre-pressure is applied to the outer ring sealing structure and the inner ring sealing structure through the fastening piece to form a double-layer sealing structure. The fasteners are arranged at the edges of the top cover 1 and the box body 2 and are arranged at intervals along the edges. The outer ring sealing structure is arranged on the outer side of the fastener close to the edges of the top cover 1 and the box body 2, and the inner ring sealing structure is arranged on the inner side of the fastener close to the centers of the top cover 1 and the box body 2.
The double-layer sealing structure can ensure that the outer ring sealing structure and the inner ring sealing structure both bear proper pre-pressure so as to realize good sealing effect and effectively avoid the problem that the second sealing strip loses the sealing effect due to uneven stress of the existing double-layer sealing structure.
As shown in fig. 3 and 4: the lower surface at top cap 1 edge is the top cap contact surface 11 with box 2 contact, and the upper surface at box 2 edge is the box contact surface 21 with top cap 1 contact, the fastener includes: a bolt 3 and a nut; the box body contact surface 21 is provided with a box body bolt hole 22, and the top cover contact surface 11 is provided with a top cover bolt hole 14. During connection, because the screw rods of the top cover bolt hole 14 and the bolt 3 and the screw rods of the box body bolt hole 22 and the bolt 3 are not completely attached to each other in a tight surface manner, a certain gap is reserved between the screw rods, water can flow into the contact surfaces of the top cover 1 and the box body 2 from the top of the bolt 3 along the gap between the screw rods of the top cover bolt hole 14 and the bolt 3, the water enters the contact surfaces of the top cover 1 and the box body 2 by bypassing the outer sealing ring, and thus the outer sealing ring does not have the waterproof function to meet the requirement, and the risk of water inlet of the high-pressure equipment box is increased.
For this purpose, a counter bore 13 is arranged at the periphery of the top cover bolt hole 14, an elastic sealing rubber annular elastic sealing sleeve 6 is arranged in the counter bore 13, the lower end face of the annular elastic sealing sleeve 6 protrudes out of the top cover contact surface 11, and the protruding height of the annular elastic sealing sleeve is H2. The annular elastic sealing sleeve 6 is an annular silicon rubber pad and is bonded in the counter bore 13 through elastic sealing glue, the thickness of the elastic sealing glue is 0.5-1mm, and the protruding height H2 of the annular silicon rubber pad is 0.5-1 mm.
When the bolt 3 is connected with the nut through the top cover bolt hole 14 and the box body bolt hole 22 in sequence to press the top cover 1 on the box body 2, the annular elastic sealing sleeve 6 is pressed on the box body contact surface 21 (as shown in fig. 2). Through addding annular elastic sealing cover 6 between top cap 1 and box 2, utilize annular elastic sealing cover 6's deformation to form annular seal in bolt hole 14 department, make the contact surface between top cap 1 and the box 2 pass through annular elastic sealing cover and form absolute sealed space to the contact surface between bolt hole 14 infiltration top cap 1 and the box 2 of the water that has prevented the top inflow has reduced the risk that the high-pressure equipment case intake.
If only set up annular elastic sealing cover 6 and prevent that the inflow that the top flowed into from permeating between top cap contact surface and the box contact surface, still can not guarantee sealing reliability completely, the risk that the infiltration water must be discharged and just can further reduce the infiltration, so this embodiment still is provided with sluicing passageway 25 on box 2, the one end and the box bolt hole 22 of sluicing passageway 25 are linked together, the other one end of sluicing passageway 25 is linked together with the external world. So that the water flowing in along the gap between the head bolt hole 14 and the screw of the bolt 3 continues to flow to the drain passage 25 along the gap between the box bolt hole 22 and the screw, and flows out of the box 2 through the drain passage 25.
The box contact surface 21 below is provided with the frame section bar that the cross-section is the C type, the nut is nut block 4, nut block 4 puts into the frame section bar cavity that the cross-section is the C type through nut block installation breach 26 to remove mounted position along the section bar cavity. The nut block 4 is provided with a threaded hole 41, and bolts sequentially penetrate through the top cover bolt hole 14 and the box body bolt hole 22 to be matched and connected with the threaded hole 41 in the nut block 4; a gap is reserved between the nut block 4 and the C-shaped frame profile, and the gap is the water drainage channel 25.
The frame section bar arranged below the box contact surface 21 can enhance the rigidity of the box contact surface 21, and avoids the wavy buckling deformation of bolt fastening positions and non-fastening positions.
The outer side of a top cover bolt hole 14 in the top cover contact surface 11 is provided with a circle of groove 12, an outer ring sealing ring 5 is embedded in the groove 12, and the bottom of the outer ring sealing ring 5 is in contact sealing with the box contact surface 21 to form the outer ring sealing structure. The size of recess 12 is 5mm 6mm, outer lane sealing washer 5 bonds in recess 12 through elastic sealing glue, prevents that the not tight problem of sealing that the displacement of outer lane sealing washer 5 leads to from appearing. The bottom of the outer ring seal 5 protrudes from the top cover contact surface 11 by H1, preferably by 3mm, H1. The outer ring sealing ring 5 adopts a hollow arc-shaped structure in the middle, so that the extrusion force of the outer ring sealing ring 5 is ensured not to be too large, and meanwhile, the rebound resilience is better.
A circle of bulges 23 are arranged on the box body contact surface 21 on the inner side of the box body bolt hole 22, the bulges 23 and the box body contact surface 21 are integrally formed, the top of each bulge 23 is provided with an inner ring sealing ring 7, and the top of each inner ring sealing ring 7 is in contact sealing with the top surface 15 of the top cover 1 to form the inner ring sealing structure.
The arrangement of the inner ring sealing structure can prevent water permeating when the outer ring sealing structure fails from being blocked, and the sealing performance of the overhead equipment box is ensured.
The inner ring sealing ring 7 is provided with a concave clamping groove, the concave clamping groove of the inner ring sealing ring 7 is stuck on the top of the bulge 23, and the elastic sealing glue is used for firm adhesion. When the outer ring seal 5 is in contact with the tank contact surface 21 but is not compressed, the inner ring seal 7 is also in contact with the inner ring seal surface 15 and is not compressed. When the nut is screwed down, the outer ring sealing ring 5 and the inner ring sealing ring 7 can be compressed to the same degree, and two sealing surfaces with good sealing performance are formed, so that the sealing performance of the overhead equipment box is ensured. The inner ring sealing ring 7 adopts a hollow arc-shaped structure, so that the extrusion force of the inner ring sealing ring 7 is not too large, and the rebound resilience is better.
In the present embodiment, the top position of the inner ring seal ring 7 is set to be higher than the bottom position of the outer ring seal ring 5. And a barrier structure is formed on the penetrated liquid by utilizing the height difference between the sealing surface of the inner ring sealing structure and the sealing surface of the outer ring sealing structure. Even if the outer ring sealing structure fails, water permeating between the top cover 1 and the box body 2 can be blocked by the inner ring sealing structure, and the sealing performance of the overhead equipment box is ensured.
As shown in fig. 5 to 7: be provided with hinge 8 between a side of top cap 1 and the box 2, hinge 8 includes: the hinge comprises a hinge seat 81, a rotating shaft 82 and a hinge body 83, wherein the hinge body 83 is rotatably connected with the hinge seat 81 through the rotating shaft 82. The hinge seat 81 is placed in the frame section bar cavity with the C-shaped section through the nut block mounting notch 26 and moves to the mounting position along the section bar cavity.
The top cover 1 can rotate relative to the box body 2 to be opened or closed, so that the top cover 1 can flexibly rotate around one side of the box body 2 to be opened without interfering with other parts on the roof, and the electrical equipment in the box body can be conveniently overhauled. An air supporting telescopic rod 9 is arranged between the box body 2 and the top cover 1 and is used for balancing the gravity moment when the top cover 1 is opened. A square hole 26 is formed beside the thread block 4 on the box body 2, the thread block 4 can be conveniently placed into a C-shaped groove in the box body 2 through the square hole 26, and the positions and the number of the thread block 4 and the bolts 3 can be adjusted at any time according to installation requirements.
The air supporting telescopic rod 9 is connected through the embedded metal piece on the inner side of the top cover 1, and the other end of the air supporting telescopic rod is connected with the box body 2. When the top cover 1 is opened to more than or equal to 60 degrees, the air supporting telescopic rod 9 ensures the space limit of the top cover 1, and the labor intensity of operators is reduced.
As shown in fig. 8: top cap 1 is through RTM technology integrated into one piece, guarantees top cap 1's outward appearance and mounting surface's plane degree through the mould, has prevented the sealed inefficacy problem that top cap 1 unevenness leads to.
The edge of the top cover 1 is made of thickened boss solid glass fiber reinforced composite material, and the thickness is more than or equal to 20 mm. Other main part positions of top cap 1 except that the marginal thickening position all adopt the sandwich structure of glass fibre reinforced composite + PET foam + glass fibre reinforced composite, and its thickness is 3+25+3mm respectively, guarantees top cap 1's rigidity when like this can furthest lightweight, reduces top cap 1 weight.
The metalwork adopts the form of aluminum alloy + screw steel bushing, pre-buries among glass fiber reinforced composite when top cap 1 shaping, and shown recess 12 adopts the mould shaping, and the fine layer of spreading of recess 12 glass is laid along recess 12 appearance, has avoided the fibre that machining leads to discontinuous, guarantees the structural strength of recess 12 positions.
The inner side of the top cover 1 is sprayed with a fireproof insulating coating which has fireproof and insulating properties. Compared with a coating top cover sprayed with the coating, the comparative tracking index is more than or equal to CTI600, the breakdown strength is more than or equal to 35kV/mm, and the coating is not changed after being burnt for 50 minutes by naked flame at 1300 ℃.
The invention also relates to a method for improving the sealing performance of the overhead high-voltage equipment box of the motor train unit, which is characterized in that a top cover 1 is connected to a box body 2 in a sealing manner through a fastening piece, an outer ring sealing structure and an inner ring sealing structure are respectively arranged at two sides of the fastening piece, and when the top cover 1 is tightly pressed on the box body 2 through the fastening piece, the outer ring sealing structure and the inner ring sealing structure are tightly pressed between the top cover 1 and the box body 2 by using the pressing force of the fastening piece, so that a.
The double-layer sealing structure can ensure the proper pre-pressure of the two sealing parts to realize good sealing effect and effectively avoid the problem that the second sealing strip of the existing double-layer sealing structure loses the sealing effect.
The horizontal position of the sealing surface of the inner ring sealing structure is set to be higher than that of the outer ring sealing structure, and a blocking structure is formed for the penetrated liquid by utilizing the height difference between the sealing surface of the inner ring sealing structure and the sealing surface of the outer ring sealing structure.
And water flowing into the space between the top cover 1 and the box body 2 when the outer ring sealing structure fails is blocked outside the inner ring sealing structure, so that the sealing performance of the overhead equipment box is ensured.
In summary, the following steps: the invention has the beneficial effects that: the sealing structure with the outer ring sealing structure and the inner ring sealing structure is arranged on two sides of the fastener respectively, so that proper pre-pressure on the sealing element is guaranteed, and a good sealing effect is achieved. An annular elastic sealing sleeve is arranged at the position of the top cover bolt hole to form an annular sealing surface, so that water penetrating along the top cover bolt hole flows to the water drainage channel along a gap between the bolt hole and the screw rod and flows out of the box body without entering a contact surface between the top cover and the box body. The frame section bar arranged below the contact surface of the box body enhances the rigidity of the box body, and avoids the wavy warping deformation after the bolt is fastened. The top position of the inner ring sealing ring is higher than the bottom position of the outer ring sealing ring, so that water permeating between the top cover and the box body when the outer ring sealing structure fails can be blocked outside the inner ring sealing structure, and the sealing performance of the overhead equipment box is ensured.
The above embodiments are provided for illustrative purposes only and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore all equivalent technical solutions should fall within the scope of the present invention, and the scope of the present invention should be defined by the claims.
Claims (10)
1. The utility model provides a EMUs overhead high-tension apparatus case top cap seal structure, includes: box (2) and top cap (1), top cap (1) pass through fastener sealing connection in on box (2), its characterized in that: an outer ring sealing structure and an inner ring sealing structure are respectively arranged between the top cover (1) and the box body (2) and positioned on two sides of the fastening piece, and pre-pressure is applied to the outer ring sealing structure and the inner ring sealing structure by the fastening piece to form a double-layer sealing structure.
2. The header seal structure of claim 1, wherein: the lower surface at top cap (1) edge is top cap contact surface (11) with box (2) contact, and the upper surface at box (2) edge is box contact surface (21) with top cap (1) contact, the fastener includes: a bolt (3) and a nut; the box body contact surface (21) is provided with a box body bolt hole (22), the top cover contact surface (11) is provided with a top cover bolt hole (14), the periphery of the top cover bolt hole (14) is provided with a counter bore (13), an annular elastic sealing sleeve (6) is arranged in the counter bore (13), the lower end face of the annular elastic sealing sleeve (6) protrudes out of the top cover contact surface (11), and when the bolt (3) sequentially penetrates through the top cover bolt hole (14) and the box body bolt hole (22) to be connected with a nut to press the top cover (1) onto the box body (2), the annular elastic sealing sleeve (6) is pressed onto the box body contact surface (21).
3. The header seal structure of claim 2, wherein: the box body (2) is further provided with a water drainage channel (25), one end of the water drainage channel (25) is communicated with the box body bolt hole (22), and the other end of the water drainage channel (25) is communicated with the outside.
4. The header seal structure of claim 3, wherein: a frame profile with a C-shaped section is arranged below the box body contact surface (21), the nut is a nut block (4), the nut block (4) is arranged in the frame profile, a threaded hole (41) is formed in the nut block (4), and a bolt sequentially penetrates through a top cover bolt hole (14) and a box body bolt hole (22) to be matched and connected with the threaded hole (41) in the nut block (4); and a gap is reserved between the nut block (4) and the C-shaped frame profile, and the gap is the water drainage channel (25).
5. The header seal structure of claim 2, wherein: the outer side of a top cover bolt hole (14) in the top cover contact surface (11) is provided with a circle of groove (12), an outer ring sealing ring (5) is embedded in the groove (12), the bottom of the outer ring sealing ring (5) is in contact sealing with the box contact surface (21), and the outer ring sealing structure is formed.
6. The header seal structure of claim 2, wherein: the inner ring sealing structure is characterized in that a circle of protrusions (23) are arranged on a box body contact surface (21) on the inner side of a box body bolt hole (22), the protrusions (23) and the box body contact surface (21) are integrally formed, an inner ring sealing ring (7) is arranged at the top of each protrusion (23), and the top of the inner ring sealing ring (7) is in contact sealing with a top surface (15) of the top cover (1) to form the inner ring sealing structure.
7. The header seal structure of claim 6, wherein: the top position of the inner ring sealing ring (7) is higher than the bottom position of the outer ring sealing ring (5).
8. The header seal structure according to any one of claims 1 to 7, wherein: be provided with hinge (8) between a side of top cap (1) and box (2), top cap (1) can rotate for box (2) and open or close, be provided with gas between box (2) and top cap (1) and prop telescopic link (9), gravity moment when being used for balancing top cap (1) and opening.
9. The method for improving the sealing performance of the overhead high-voltage equipment box of the motor train unit is characterized in that a top cover (1) is connected to a box body (2) in a sealing mode through a fastener, and the method comprises the following steps: the outer ring sealing structure and the inner ring sealing structure are respectively arranged at two sides of the fastener, when the top cover (1) is pressed on the box body (2) through the fastener, the outer ring sealing structure and the inner ring sealing structure are both pressed between the top cover (1) and the box body (2) through the pressing force of the fastener, and a double-layer sealing structure is formed.
10. The method of claim 9, wherein: the horizontal position of the sealing surface of the inner ring sealing structure is set to be higher than that of the outer ring sealing structure, and the height difference between the sealing surface of the inner ring sealing structure and the sealing surface of the outer ring sealing structure is utilized to form a blocking structure for the permeated water.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911005517.9A CN110752522A (en) | 2019-10-22 | 2019-10-22 | Motor train unit overhead high-voltage equipment box top cover sealing structure and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911005517.9A CN110752522A (en) | 2019-10-22 | 2019-10-22 | Motor train unit overhead high-voltage equipment box top cover sealing structure and method |
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| CN110752522A true CN110752522A (en) | 2020-02-04 |
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| CN201911005517.9A Pending CN110752522A (en) | 2019-10-22 | 2019-10-22 | Motor train unit overhead high-voltage equipment box top cover sealing structure and method |
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| CN (1) | CN110752522A (en) |
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| CN113606337A (en) * | 2021-07-30 | 2021-11-05 | 上海汉虹精密机械有限公司 | High vacuum sealing structure for inner circle of quartz cylinder |
| CN113645794A (en) * | 2021-07-15 | 2021-11-12 | 北京遥测技术研究所 | Double-layer convolution type sealing structure and method based on height difference |
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