CN105788897A - Design method for fuse disconnecting switch - Google Patents
Design method for fuse disconnecting switch Download PDFInfo
- Publication number
- CN105788897A CN105788897A CN201610355402.2A CN201610355402A CN105788897A CN 105788897 A CN105788897 A CN 105788897A CN 201610355402 A CN201610355402 A CN 201610355402A CN 105788897 A CN105788897 A CN 105788897A
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- China
- Prior art keywords
- columnar part
- fuse
- connecting column
- contact
- room
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/58—Electric connections to or between contacts; Terminals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
- H01H31/02—Details
- H01H31/12—Adaptation for built-in fuse
Abstract
The invention discloses a design method for a fuse disconnecting switch and belongs to the field of electrical equipment. The design method includes the steps that a fuse chamber, a contact chamber, a handle arranged on the front face of the fuse chamber, and a terminal connected with a static contact are provided, a connecting post is arranged on the terminal, the connecting post is partially embedded into the terminal and is in interference fit with the terminal, a first conductive columnar part in interference fit with a power busbar is arranged on the connecting post, a second conductive columnar part is coaxially arranged in the first columnar part, the first columnar part and the second columnar part are in interference fit, and the thermal expansion coefficient of the second columnar part is larger than that of the first columnar part. The design method has the following advantages that a larger conductive area is generated through the same lap joint length, the current density is reduced accordingly, and low temperature rise of the terminal is achieved; the use number of busbars is reduced, and resources are saved; the electrical clearance or safety distance is increased, and the electrical safety of equipment is improved.
Description
Technical field
The present invention relates to field of electrical equipment, be specifically related to the method for designing of a kind of fuse disconnecting switch.
Background technology
In existing electric power complete set of equipments factory, fuse disconnecting switch is arranged in power distribution cabinet by workmen, the binding post of fuse disconnecting switch generally adopts power bus-bar directly to couple, power bus-bar is directly overlapped on binding post, binding post couples the generally overlapping splicing processes of employing with power bus-bar, fastens with bolt more afterwards.As shown in Figure 3 and Figure 4, such coupling method needs overlapping with binding post for busbar certain length, so that the electric current density of contact surface maintains in certain limit value, so that the temperature rise of connection place meets relevant criterion.In order to make connection place temperature rise low, it usually needs increase the length that busbar is overlapping with terminal, make contact area increase, and then make the electric current density of contact surface reduce, finally make connection place have relatively low temperature rise.And increase overlap length and can strengthen the consumption of busbar, and then increase manufacturing cost.The bolt of fastening can make the electric clearance between conductive component and non conductive component or safe distance reduce, in order to make electric clearance or safe distance remain unchanged, need to strengthen the spacing between binding post and non conductive component, and strengthen spacing and necessarily cause the overall dimensions of whole fuse disconnecting switch to become big.How to increase contact area and to make connection place temperature rise low, but do not reduce electric clearance, and do not strengthen connection place and take up room.
Summary of the invention
It is an object of the invention to solve the problems referred to above, and the method for designing of a kind of fuse disconnecting switch is provided.
For this, the present invention provides the method for designing of a kind of fuse disconnecting switch, it includes providing the fuse room holding fuse, holding the binding post that the contact room of static contact couples with static contact, connection terminal portion is made to expose contact room, in the front of fuse room, handle is set by tip position, make fuse and fuse room detachably install, make fuse room can rotate around the axis total with contact room.Binding post arranges connecting column, make connecting column be partially submerged into binding post and with binding post interference fit, the first columnar part of the conduction of setting and power bus-bar interference fit on connecting column, first columnar part is coaxially disposed second columnar part with electric conductivity, make the first columnar part and the second columnar part interference fit, second columnar part is arranged at inside the first columnar part, makes the coefficient of thermal expansion coefficient of thermal expansion more than the first columnar part of the second columnar part.
Advantageously, the resistivity resistivity more than the first columnar part of the second described columnar part is made.
Specifically, the material of the second described columnar part is set to aluminum or aluminium alloy, the material of the first columnar part is set to copper or copper alloy.
Preferably, the ratio of the external diameter of the second described columnar part and the external diameter of the first columnar part is set to 0.5-0.8.
Specifically, the second columnar part is set to solid construction, the first columnar part is set to hollow structure, make the second columnar part run through the first columnar part.
Advantageously, being coaxially arranged with the second through hole inside connecting column, the outer cylinder at connecting column is radially arranged the first through hole, makes the first through hole and the connection of the second through hole, and the first through hole is arranged at the axial middle part of connecting column.
Beneficial effect
Owing to the method for designing of fuse disconnecting switch disclosed by the invention is to adopt the connecting mode of docking to couple with power bus-bar binding post, relative to existing overlapping overlapping mode, it can bring following beneficial effect.
1. the identical lap of splice produces more conductive area, and then reduces electric current density, it is achieved the low-temperature-rise of connection place.
2., without busbar being carried out overlapping overlap joint, reducing the consumption of busbar, having saved resource.
3. owing to eliminating fastening screw screw bolt and nut, thus increase electric clearance or relatively distance or safe distance, improve the electrical security of equipment.
4., owing to eliminating fastening screw screw bolt and nut, so the distance between connection place and non conductive component becomes big, and connection place takes up room and does not increase.
Accompanying drawing explanation
In explanation below in reference to the accompanying drawing embodiment to providing as non-limiting example, the present invention and superiority thereof will be better understood, accompanying drawing is as follows:
Fig. 1 is the axonometric chart in existing fuse disconnecting switch front；
Fig. 2 is the axonometric chart at the existing fuse disconnecting switch back side；
Fig. 3 is the axonometric chart in existing fuse disconnecting switch front, and wherein power bus-bar is to connecting；
Fig. 4 is the axonometric chart at the existing fuse disconnecting switch back side, and wherein power bus-bar is to connecting；
Fig. 5 is the axonometric chart in fuse disconnecting switch front disclosed by the invention；
Fig. 6 is the axonometric chart at the fuse disconnecting switch back side disclosed by the invention；
Fig. 7 is the axonometric chart in fuse disconnecting switch front disclosed by the invention, and wherein power bus-bar is to connecting；
Fig. 8 is the axonometric chart at the fuse disconnecting switch back side disclosed by the invention, and wherein power bus-bar is to connecting；
Fig. 9 is existing power bus-bar overlapping mode and the size comparison of power bus-bar docking mode disclosed by the invention schemes；
Figure 10 is the exploded partial perspective view of the binding post position of Fig. 7；
Figure 11 is the axonometric chart of connecting column disclosed by the invention；
Figure 12 is the perspective cut-away view of Figure 11；
Figure 13 is the exploded perspective view of Figure 11；
Figure 14-15 is the arrangement schematic diagram of connecting column disclosed by the invention；
Figure 16 is the axonometric chart of power bus-bar；
Figure 17 is the electrical schematic diagram of fuse disconnecting switch.
Description of reference numerals
1. the first columnar part；2. the second columnar part；3. front；4. the back side；5. end face；6. the first through hole；7. the second through hole；8. fuse room；9. contact room；10. handle.
Detailed description of the invention
R in present specification represents radius.
As depicted in figs. 1 and 2, it it is a kind of existing fuse disconnecting switch, it includes holding the fuse room 8 of fuse, holding the binding post that the contact room 9 of static contact couples with static contact, connection terminal portion exposes contact room 9, the front of fuse room 8 arranges handle 10 by tip position, fuse and fuse room 8 are detachably installed, and fuse room 8 can rotate around the axis total with contact room 9.
As shown in Figure 3 and Figure 4, the binding post of existing fuse disconnecting switch and the connecting mode of power bus-bar, the connecting mode adopted is overlapping overlapping mode, after power bus-bar and binding post overlap certain length, the two being fastened with screw bolt and nut, such connecting mode is defined as overlap joint again.
As shown in Figure 5 and Figure 6, fuse disconnecting switch disclosed by the invention, it includes holding the fuse room 8 of fuse, holding the binding post that the contact room 9 of static contact couples with static contact, connection terminal portion exposes contact room 9, the front of fuse room 8 arranges handle 10 by tip position, fuse and fuse room 8 are detachably installed, and fuse room 8 can rotate around the axis total with contact room 9.By pulling handle 10, fuse room 8 can be made to rotate around the axis total with contact room 9, and then make fuse room 8 depart from contact room 9, owing to fuse is installed in fuse room 8, so fuse is also departing from contact room 9, owing to static contact is installed in contact room 9, so fuse also disconnects with static contact, it is achieved the isolation of circuit.By driving handle, fuse room 8 can be made to rotate around the axis total with contact room 9, and then make fuse room 8 be partially into contact room 9, owing to fuse is installed in fuse room 8, static contact is installed in contact room 9, so fuse inserts static contact, and then fuse is connected in series into circuit.Therefore by pulling or driving handle 10, it may be achieved the connection of fuse and static contact and disjunction, and then the fuse protection to circuit is realized, as shown in figure 17.
As shown in Figure 5 and Figure 6, binding post is provided with connecting column, connecting column be partially submerged into binding post and with binding post interference fit, embedded length is the half of connecting column length, the lower half of connecting column embeds binding post, and connecting column is coupled by the pin in binding post front with the fastening of both binding posts.
As shown in Figure 7 and Figure 8, pre-manufactured hole on power bus-bar is inserted in the connecting column on binding post, power bus-bar and connecting column interference fit, the end face of power bus-bar is fitted with the end face of binding post, connecting column is coupled by the pin in power bus-bar front with the fastening of both power bus-bars, and such connecting mode is defined as docking.
As shown in Figure 9, it is existing power bus-bar overlapping mode and the size comparison of power bus-bar docking mode disclosed by the invention schemes, the first half is the binding post overlapping mode with power bus-bar of existing fuse disconnecting switch, and lower half is the binding post docking mode with power bus-bar of fuse disconnecting switch disclosed by the invention.In order to strengthen the contrast effect of two kinds of connecting modes, connecting mode disclosed by the invention is set directly at the lower section of existing connecting mode, and the dotted line in figure is equal just to the thickness embodying upper and lower busbar, does not represent the physical connection mode of upper and lower busbar.Two kinds of connecting modes the lap of splice the same, be all L5, be presented as: the overlap length of the power bus-bar under existing connecting mode and binding post is L5, and the length of the connecting column under connecting mode disclosed by the invention is also L5.The directly perceived change that two kinds of connecting modes bring is exactly the significant change of relative dimensions, L1 is the electric clearance under existing connecting mode or relatively distance, L2 is the electric clearance under connecting mode disclosed by the invention or relatively distance, the connection place that L3 is under existing connecting mode takies width, the connection place that L4 is under connecting mode disclosed by the invention takies width, L7 is the safe distance under existing connecting mode, and L9 is the safe distance under connecting mode disclosed by the invention.Can visually see from figure: L2 is significantly greater than L1, the size of increase is approximately the height of nut and adds the height of the prominent nut of bolt tail.L4 is significantly less than L3, and the size of reduction is approximately busbar thickness and adds bolt head height and add height of nut and add the height of the prominent nut of bolt tail.L9 is significantly greater than L7, and the chi of increase is approximately the thickness of busbar and adds bolt head height.Therefore, the factor (electric clearance or relatively distance or safe distance) that power equipment is favourable is improved, and the disadvantageous factor of power equipment (connection place takes up room) is obtained minimizing.
As shown in Figure 10, before connecting column is assemblied in binding post, first processing 3 pre-manufactured holes receiving connecting columns at the end face 5 of binding post along the length direction of outfan, the diameter of pre-manufactured hole is slightly less than the external diameter of connecting column, makes connecting column and pre-manufactured hole interference fit diametrically；The degree of depth of the pre-manufactured hole connecting column length slightly larger than 0.5 times, after pre-manufactured hole processes, the half length of connecting column is inserted in pre-manufactured hole, the first through hole in the middle part of connecting column is made to be in end face 5 place, vertically process the through hole for assembling pin from the front 3 of binding post, make through hole run through front 3 and the back side 4 of binding post, and run through connecting column simultaneously, the axis of through hole and the axes intersect of connecting column, coupled the fastening of both binding post and connecting column by pin.
As shown in figure 16, before power bus-bar is assemblied in binding post, first processing 3 pre-manufactured holes at the end face 5 of power bus-bar along busbar length direction, the diameter of pre-manufactured hole is slightly less than the external diameter coupling pillar, makes connecting column and pre-manufactured hole interference fit diametrically；The degree of depth of the pre-manufactured hole connecting column length slightly larger than 0.5 times, after pre-manufactured hole processes, pre-manufactured hole on power bus-bar is inserted in the connecting column revealed on binding post, until the end face 5 of the end face 5 of power bus-bar and binding post is fitted, the through hole for assembling pin is vertically processed from the front 3 of power bus-bar, through hole is made to run through front 3 and the back side 4 of power bus-bar, and run through connecting column simultaneously, the axis of through hole and the axes intersect of connecting column, by pin, the fastening of both power bus-bar and connecting column is coupled, the fastening finally achieving power bus-bar and binding post couples.
After binding post and power bus-bar docking, making connecting column and pre-manufactured hole matched in clearance in the axial direction, be conducive to being close to of the end face of binding post and the end face of power bus-bar, the head processing of pre-manufactured hole has the chamfering of convenient installation.Due to hole and pin interference fit, after pin is seated, can limiting binding post and mutual the moving axially of power bus-bar, finally make binding post, connecting column, power bus-bar, pin firmly couples together.
As shown in figure 11, a kind of connecting column of the binding post of fuse disconnecting switch disclosed by the invention, it has columned profile, and end is provided with chamfering convenient for assembly.
As shown in figure 12, being coaxially disposed the second columnar part 2 in the first columnar part 1, the first columnar part 1 and the second columnar part 2 interference fit, the material of the first columnar part 1 is copper, and the material of the second columnar part 2 is aluminum.
As shown in figure 13, the first columnar part 1 has the structure of hollow, and the second columnar part 2 runs through the first columnar part 1, and the ratio of the external diameter of the second columnar part 2 and the external diameter of the first columnar part 1 is 0.5-0.8.First and second columnar part 1,2 all has electric conductivity, and the coefficient of thermal expansion of the second columnar part 2 is more than the coefficient of thermal expansion of the first columnar part 1, and the resistivity of the second columnar part 2 is more than the resistivity of the first columnar part 1.
Be assemblied in binding post and power bus-bar when connecting column after, due to the pre-manufactured hole interference fit of the first columnar part 1 with binding post and busbar, so, the first columnar part 1 and binding post and busbar fit tightly, and the first columnar part 1 of connecting column fully carries electric current.Due to the first columnar part 1 and the second columnar part 2 also interference fit, so the first columnar part 1 and the second columnar part 2 also fit tightly, the second columnar part 2 also fully carries electric current.nullTherefore，The heat effect of the first columnar part 1 and the second columnar part 2 can give full play to，Owing to the resistivity of the second columnar part 2 is more than the resistivity of the first columnar part 1，So the temperature of the second columnar part 2 can be higher than the first columnar part 1，Owing to the coefficient of thermal expansion of the second columnar part 2 is more than the coefficient of thermal expansion of the first columnar part 1，Therefore，When temperature and coefficient of thermal expansion are all relatively high，The radially enlarged phenomenon of the second columnar part 2 can be significantly greater than the radially enlarged phenomenon of the first columnar part 1，Therefore the second columnar part 2 can fit tightly the first columnar part 1 and apply radially outer pressure to the first columnar part 1，The radial dimension thus making the first columnar part 1 also outwards becomes big，The pre-manufactured hole ultimately resulting in the first columnar part 1 and binding post and power bus-bar more fits tightly，Also provide radially outer pressure to pre-manufactured hole simultaneously，Namely the pressure ratio connecting column between connecting column and binding post and busbar is bigger when just assembling，Increasing contact pressure can also make the temperature rise of contact site reduce.
As can be seen here, the coupling of interference fit between each feature, the coupling of resistivity and coefficient of thermal expansion has obvious action to reducing the binding post temperature rise with busbar connection place, effect between three is complementary, originally interference fit makes resistivity and coefficient of thermal expansion have the basis played a role, and the effect that resistivity and coefficient of thermal expansion produce exacerbates interference fit, finally so that the contact pressure of connection place strengthens.
As shown in figure 14, cross section is foursquare power bus-bar, and centre is provided with a pre-manufactured hole receiving connecting column, and pre-manufactured hole circumference is R to the distance of bus bar edge, and busbar width is L6.When adopting existing overlapping splicing processes to couple, the conductive area of connection place is
S1=L6xL5=(R+2R+R) xL5=4RxL5(L5 is the lap of splice, as shown in Figure 9)
And when adopting connecting column to couple, the conductive area of connection place is
S2=2πRxL5
Therefore,
S2:S1=2πR:4R=π/2≈1.57
So, adopt the mode of connecting column overlap joint can obtain more contact area.Obviously, when meeting mechanical strength, increase the diameter of pre-manufactured hole, reduce hole back gauge and can obtain bigger contact area.
As shown in figure 15, cross section is rectangular power bus-bar, and centre arranges 3 pre-manufactured holes receiving connecting column, and pre-manufactured hole circumference is R to the distance of bus bar edge, and the beeline between each hole is R, and busbar width is L6.When adopting existing overlapping splicing processes to couple,
The conductive area of connection place is
S1=L6xL5=(4R+3x2R)xL5=10RxL5
And when adopting connecting column to couple, the conductive area of connection place is
S2=3x2πRxL5=6πRxL5
Therefore,
S2:S1=6πR:10R=3π/5≈1.884
So, adopt the mode of connecting column overlap joint can obtain more contact area.Obviously, when meeting mechanical strength, increase the diameter of pre-manufactured hole, reduce hole back gauge and can obtain bigger contact area.
Therefore, connecting column disclosed by the invention creates the good effect of two aspects, and one is the increase in contact pressure, two is increased considerably conductive area, under the combined effect of the two active factor, the temperature rise of connection place is greatly lowered, it is achieved that the purpose of the present invention.
As shown in figure 16, in order to distinguish each face of busbar and binding post, end face 5 is defined as the thickness with busbar (or binding post) and the face of width composition, namely identifies the face of 5 in Figure 16.Front and back is defined as the width with busbar (or binding post) and the face of length composition, namely identifies the face of 3,4 in figure, and 3 is front, and 4 is the back side.
As shown in figure 12, the inside of the second columnar part 2 is coaxially arranged with the second through hole 7, first columnar part 6 has hollow structure, second columnar part 2 runs through the first columnar part 1, the outer cylinder of the first columnar part 1 is radially arranged the first through hole 6, first through hole 6 connects with the second through hole 7, and the first through hole 6 is positioned at the axial middle part of the first columnar part 1.
Setting due to through hole 6,7, make connecting column in inserting the process of pre-manufactured hole of binding post, air in pre-manufactured hole can successfully be discharged from the second through hole 7, and then connecting column can be successfully seated, when power bus-bar is inserted in already installed connecting column, air in the pre-manufactured hole of power bus-bar can be smoothly through the second through hole 7 and discharge from the first through hole 6, and then the second busbar can be seated smoothly.
Embodiment two
The material of the first columnar part 1 in embodiment one is changed to copper alloy, the material of the second columnar part 2 changes to aluminium alloy, owing to the hardness of alloy is more relatively high, first the second columnar part 2 can be preserved under low temperature environment (5 degree) a period of time (5 minutes), and the first columnar part 1 preserves a period of time (5 minutes) under hot environment (80 degree), by effect of expanding with heat and contract with cold, the internal diameter that can make the first columnar part 1 slightly becomes big, and the external diameter of the first columnar part 1 slightly diminishes, and then easily the second columnar part 2 is assembled in the first columnar part 1, after the connecting column prepared to be installed recovers room temperature, first columnar part 1 and the second columnar part 2 can realize interference fit.The diameter of connecting column disclosed by the invention and length have different size specification, to adapt to the needs of different busbar size or binding post size.
Claims (6)
1. the method for designing of a fuse disconnecting switch, it includes providing the fuse room (8) holding fuse, holding the binding post that the contact room (9) of static contact couples with static contact, connection terminal portion is made to expose contact room (9), in the front of fuse room (8), handle (10) is set by tip position, make fuse and fuse room (8) detachably install, make fuse room (8) can rotate around the axis total with contact room (9)；It is characterized in that, binding post arranges connecting column, make connecting column be partially submerged into binding post and with binding post interference fit, at union end (9), connecting column is set, make connecting column be partially submerged into union end (9) and with union end (9) interference fit, first columnar part (1) of the conduction of setting and power bus-bar interference fit on connecting column, first columnar part (1) is coaxially disposed second columnar part (2) with electric conductivity, make the first columnar part (1) and the second columnar part (2) interference fit, second columnar part (2) is arranged at the first columnar part (1) internal, make the coefficient of thermal expansion coefficient of thermal expansion more than the first columnar part (1) of the second columnar part (2).
2. the method for designing of the isolation switch that a kind of contact off-state according to claim 1 is visual, it is characterised in that make the resistivity resistivity more than the first columnar part (1) of described the second columnar part (2).
3. the method for designing of the isolation switch that a kind of contact off-state according to claim 2 is visual, it is characterized in that, the material of described the second columnar part (2) is set to aluminum or aluminium alloy, the material of the first columnar part (1) is set to copper or copper alloy.
4. the method for designing of the isolation switch that a kind of contact off-state according to claim 1 is visual, it is characterised in that the ratio of the external diameter of described the second columnar part (2) and the external diameter of the first columnar part (1) is set to 0.5-0.8.
5. the method for designing of the isolation switch that a kind of contact off-state according to claim 4 is visual, it is characterized in that, second columnar part (2) is set to solid construction, the first columnar part (1) is set to hollow structure, make the second columnar part (2) run through the first columnar part (1).
6. the method for designing of the isolation switch that a kind of contact off-state according to claim 4 is visual, it is characterized in that, the second through hole (7) it is coaxially arranged with inside connecting column, outer cylinder at connecting column is radially arranged the first through hole (6), make the first through hole (7) connect with the second through hole (6), the first through hole (6) is arranged at the axial middle part of connecting column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610355402.2A CN105788897A (en) | 2016-05-25 | 2016-05-25 | Design method for fuse disconnecting switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610355402.2A CN105788897A (en) | 2016-05-25 | 2016-05-25 | Design method for fuse disconnecting switch |
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| CN105788897A true CN105788897A (en) | 2016-07-20 |
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| CN201610355402.2A Pending CN105788897A (en) | 2016-05-25 | 2016-05-25 | Design method for fuse disconnecting switch |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2073183A (en) * | 1934-12-24 | 1937-03-09 | Line Material Co | Fuse construction |
| CN102270544A (en) * | 2010-06-01 | 2011-12-07 | 上海电器陶瓷厂有限公司 | Combined fuse-type isolating switch |
| CN202268489U (en) * | 2011-08-11 | 2012-06-06 | 泰科电子(上海)有限公司 | Electrical connection assembly |
| CN203812784U (en) * | 2014-01-07 | 2014-09-03 | 施恩禧电气（中国）有限公司 | Outdoor low-voltage fuse type isolating switch |
| CN104852163A (en) * | 2015-05-27 | 2015-08-19 | 国网山东济南市长清区供电公司 | Assembly type cable connector |
-
2016
- 2016-05-25 CN CN201610355402.2A patent/CN105788897A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2073183A (en) * | 1934-12-24 | 1937-03-09 | Line Material Co | Fuse construction |
| CN102270544A (en) * | 2010-06-01 | 2011-12-07 | 上海电器陶瓷厂有限公司 | Combined fuse-type isolating switch |
| CN202268489U (en) * | 2011-08-11 | 2012-06-06 | 泰科电子(上海)有限公司 | Electrical connection assembly |
| CN203812784U (en) * | 2014-01-07 | 2014-09-03 | 施恩禧电气（中国）有限公司 | Outdoor low-voltage fuse type isolating switch |
| CN104852163A (en) * | 2015-05-27 | 2015-08-19 | 国网山东济南市长清区供电公司 | Assembly type cable connector |
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Application publication date: 20160720 |
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