CN207166139U - Power distribution unit and system - Google Patents
Power distribution unit and system Download PDFInfo
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- CN207166139U CN207166139U CN201721116391.9U CN201721116391U CN207166139U CN 207166139 U CN207166139 U CN 207166139U CN 201721116391 U CN201721116391 U CN 201721116391U CN 207166139 U CN207166139 U CN 207166139U
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Abstract
The utility model, which provides a kind of power distribution unit and system, the power distribution unit, to be included：At least two power supply units, at least two power supply unit cascade successively；Input jack, the input jack are arranged on one end of at least two power supply units of cascade；Multiple output plugholes, the plurality of output plughole are distributed at least two power supply units, and multiple output plugholes are to be connected in parallel.The utility model can solve the problems, such as load supplying in the system in the case where reducing the design, installation difficulty and main screw lift of the higher system of integrated level.
Description
Technical field
It the utility model is related to power technology, more particularly to a kind of power distribution unit (Power Distribution
Unit, referred to as：) and system PDU.
Background technology
In the industrial electric environment such as communications equipment room and indoor and outdoor rack, the power distribution of the various model specifications of generally existing
Unit, input power is undertaken by power distribution unit and distributes task to the power supply of load, that is to say, that power distribution unit is to connect
Connect the key link of power supply infrastructure and electrical equipment.
Conventional power distribution unit is single power supply unit, and this requires that electrical equipment will be from same position power taking.But
In the higher system of integrated level, multi-purpose electric equipment will can improve design, installation difficulty from the mode of connection of same position power taking, increase
Add main screw lift, be unfavorable for the maintenance and repair of system.
Therefore, a kind of power distribution unit of research is needed badly at present, the power distribution unit can be higher in reduction integrated level
The design of system, in the case of installation difficulty and main screw lift, solve the problems, such as load supplying in the system.
Utility model content
The utility model provides a kind of power distribution unit and system, with reduce the higher system of integrated level design,
In the case of installation difficulty and main screw lift, solves the problems, such as load supplying in the system.
In a first aspect, the utility model provides a kind of power distribution unit.The power distribution unit includes：At least two match somebody with somebody
Electric unit, wherein, at least two power supply unit cascades successively；Input jack, the input jack be arranged on cascade it is above-mentioned extremely
One end of few two power supply units；Multiple output plugholes, the plurality of output plughole are distributed on above-mentioned at least two power supply unit,
And the plurality of output plughole is to be connected in parallel.
In one embodiment, it is provided with lightning-protection module built in the power supply unit of input jack.
In one embodiment, the lightning-protection module can include piezo-resistance and gas-discharge tube.
In one embodiment, connected between each power supply unit by the power line of preset length.
In one embodiment, above-mentioned preset length is the input surge according to lightning-protection module operation voltage and access load
The collaboration of protection device operation voltage determines.Wherein, lightning-protection module is built in the power supply unit for being provided with input jack.For example,
Other power supply units that access load is contained at least two power supply units, is provided with outside the power supply unit of input jack.
In one embodiment, preset length can determine according to following manner：
1) inductance for determining power line is：L=(V2-V1)/△t；
2) according to the inductance L and empirical equation 0.9uH/m of the power line, the preset length is obtained；
Wherein, V1Represent lightning-protection module operation voltage, V2The input surge protection device activity voltage of access load is represented,
△ t represent the rising time of pulse surge voltage.
In one embodiment, input jack can be straight female or straight mothers of C19 of C13 etc..
In one embodiment, power distribution unit is used cooperatively with input power cord.
In one embodiment, one end plug of input power cord is that C14 is straight public or C20 is directly public, input power cord it is another
One end is the mains plug for being adapted to multiple national standards.Wherein, mains plug can include curved public, curved public, the straight public, PF of PK of PD of PG
Straight public affairs, straight public, straight public, straight public, the straight public and straight public affairs of PB of PF of PJ of PL of the straight public affairs-I of PJ, PI etc..
Second aspect, the utility model provide a kind of power distribution system, and the power distribution system includes such as first aspect
Power distribution unit described in any one.
Power distribution unit provided by the utility model and system, including at least two power supply units, wherein, this is at least
Two power supply units cascade successively, are arranged on the input jack of one end of above-mentioned at least two power supply unit of cascade and are distributed in
Multiple output plugholes on above-mentioned at least two power supply unit, and the plurality of output plughole is to be connected in parallel, so, multiple electricity consumptions
Equipment can power taking nearby, compared with prior art in multiple electrical equipments from same position power taking, can reduce integrated level compared with
In the case of the design of high system, installation difficulty and main screw lift, solves the problems, such as load supplying in the higher system of integrated level.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the required accompanying drawing used does one and simply introduced in description of the prior art, it should be apparent that, drawings in the following description are
Some embodiments of the utility model, for those of ordinary skill in the art, do not paying the premise of creative labor
Under, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation for the power distribution unit that the utility model embodiment provides；
Fig. 2 is the structural representation of a lightning-protection module in the power distribution unit that the utility model embodiment provides；
Fig. 3 is an application scenarios schematic diagram of the power distribution unit that the utility model embodiment provides；
Fig. 4 A, Fig. 4 B and the decomposition circuit schematic diagram that Fig. 4 C are Fig. 3；
Fig. 5 A are the front view of a power supply unit in the electrical power distribution unit that the utility model embodiment provides；
Fig. 5 B are the side view of a power supply unit in the electrical power distribution unit that the utility model embodiment provides；
Fig. 5 C are the end-view of a power supply unit in the electrical power distribution unit that the utility model embodiment provides；
Fig. 6 A are the front view of another power supply unit in the electrical power distribution unit that the utility model embodiment provides；
Fig. 6 B are the side view of another power supply unit in the electrical power distribution unit that the utility model embodiment provides；
Fig. 6 C are the end-view of another power supply unit in the electrical power distribution unit that the utility model embodiment provides；
Fig. 7 A are the front view of another power supply unit in the electrical power distribution unit that the utility model embodiment provides；
Fig. 7 B are the side view of another power supply unit in the electrical power distribution unit that the utility model embodiment provides.
Description of reference numerals：
10：Power distribution unit；
11st, 12, PDU-A and PDU-B：Power supply unit；
13：Input jack；
14：Output plughole；
20：Lightning-protection module；
MOV1, MOV2 and MOV3：Piezo-resistance；
N：Zero line；
L：Live wire；
PE：Ground wire.
Embodiment
It is new below in conjunction with this practicality to make the purpose, technical scheme and advantage of the utility model embodiment clearer
Accompanying drawing in type embodiment, the technical scheme in the embodiment of the utility model is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model part of the embodiment, rather than whole embodiments.Based on the implementation in the utility model
Example, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made, is belonged to
The scope of the utility model protection.
Reference power supply allocation unit on the market is divided to two kinds：One kind is family expenses and similar applications plugs and sockets converter, separately
It is outer it is a kind of be plugs and sockets converter under industrial environment.The former mainly meets that AC power is distributed under resident and working environment,
National standard isosceles triangle plug and the length three core power lines not etc. for standard are inputted, power line is fixed with power distribution unit to be connected
Connect, export the socket of multiple two jacks or three jacks；The latter mainly meets the interior of equipment cabinet AC power point under industrial environment
Match somebody with somebody, input as IEC60320 C14 standard input sockets, export as IEC60320 C13 standard output sockets, power line and power supply
Allocation unit separates, and one end is that IEC60320 C13 coordinate with power supply unit, and the other end is national standard isosceles triangle plug or cold pressing
Terminal, it is connected with feeder ear.
Fig. 1 is the structural representation for the power distribution unit that the embodiment of the utility model one provides.With reference to figure 1, power supply point
Include with unit 10：Power supply unit 11, power supply unit 12, input jack 13 and multiple output plugholes 14.Wherein, power supply unit 11
Cascaded with power supply unit 12；Input jack 13 is arranged on power supply unit 11；Multiple output plugholes 14 are distributed in the He of power supply unit 11
On power supply unit 12, and multiple output plugholes 14 are to be connected in parallel.
It should be noted that the utility model does not limit the number of power supply unit, two merely illustrative theorys of power supply unit in Fig. 1
Bright, in other embodiments, the number of power supply unit can also be 3,4,5, and limitation is more.
In addition, the number of input jack is 1, it is arranged on one end of at least two power supply units of cascade, such as Fig. 1 institutes
Showing, input jack 13 is arranged on power supply unit 11, or, input jack 13 can also be arranged on power supply unit 12.Ability
Field technique personnel are appreciated that one end of at least two power supply units of cascade, refer to the head and the tail of multiple power supply units of cascade
Either end in both ends.For example, power supply unit a, power supply unit b, power supply unit c and power supply unit d cascades, head and the tail both ends difference
Assign electric unit a and power supply unit d, that is to say, that input jack is arranged on power supply unit a, or, input jack is arranged on and matched somebody with somebody
On electric unit d.Go out for example, power distribution unit 10 enters N for one, wherein, N is the number of output plughole, but the utility model is not
This is only limitted to, the number of input jack can also be multiple in other embodiments.
It is distributed in for multiple output plugholes 14 on power supply unit 11 and power supply unit 12, it will be understood that multiple outputs are inserted
Hole 14 is evenly distributed on power supply unit 11 and power supply unit 12, for example, 4 output plugholes 14, wherein, power supply unit 11 and match somebody with somebody
Electric unit 12 respectively configures 2 output plugholes 14；Or multiple unequal distributions of output plughole 14 are in power supply unit 11 and power supply unit
On 12, for example, 4 output plugholes 14, wherein, 1 output plughole 14 is configured on power supply unit 11,3 are configured on power supply unit 12
Individual output plughole 14.Wherein, output plughole can not included by being provided with the power supply unit of input jack.Wherein, output plughole 14
Can be the three-phase or two-phase jack of various standards.
In the embodiment, power distribution unit includes at least two power supply units, wherein, this at least two power supply unit according to
Secondary cascade, it is arranged on the input jack of one end of above-mentioned at least two power supply unit of cascade and is distributed in above-mentioned at least two and match somebody with somebody
Multiple output plugholes on electric unit, and the plurality of output plughole is is connected in parallel, so, multiple electrical equipments can take nearby
Electricity, compared with prior art in multiple electrical equipments from same position power taking, can reduce the higher system of integrated level design,
In the case of installation difficulty and main screw lift, solves the problems, such as load supplying in the higher system of integrated level.
Alternatively, connected between each power supply unit by the power line of preset length.For example, power supply unit 11 and distribution list
Member 12 is connected by the power line of preset length.The power line serves as decoupling inductance, reaches surge current mainly by being provided with
The purpose that lightning-protection module built in the power supply unit of input jack is released.
Further, it is contemplated that with the use of a large amount of sensitive electronic equipments, many producers are in power distribution unit increase
One-level surge protective machine (Surge protection Device, referred to as：SPD), it is excessively electric to reduce induced lightening and electric grid operating
The damage risk to access load is pressed, but because access load varies, SPD can not be horizontal complete with access load protection
Match somebody with somebody, achieve a butt joint into a hundred per cent protection of load；And power distribution unit may out of doors, vehicle-mounted scene or build temporarily
Simple machinery room use, power supply environment is unstable, need to possess certain carrying out surge protection ability, and with the input wave of access load
Gush protection and realize matching.Therefore, to overcome the defect, the utility model embodiment is being set on the basis of above-described embodiment
There is lightning-protection module built in the power supply unit of input jack.
Alternatively, lightning-protection module can include piezo-resistance and gas-discharge tube.For example, Fig. 2 shows a lightning-protection module
Structure, the lightning-protection module are that AC single phase inputs lightning-protection module.With reference to figure 2, the lightning-protection module 20 includes piezo-resistance MOV1, pressure
Quick resistance MOV2, piezo-resistance MOV3, zero line N, live wire L, ground wire PE and gas-discharge tube (gas discharge tube, letter
Claim：GDT), specifically, piezo-resistance MOV2 realize between live wire L and zero line N differential mode surge protection, piezo-resistance MOV1 and
GDT realizes live wire L common mode protection, and piezo-resistance MOV3 and GDT realize zero line N common mode protection.Supplementary notes, remaining
The concrete structure of more lightning-protection modules refers to prior art, and here is omitted.
Power distribution unit based on lightning-protection module design can lift the protection specification of access load.It is specifically fast with one
The communication base station equipment of fast deployment system mainframe box is analyzed, as shown in figure 3, this system includes industrial computer, interchanger, base band
Processing unit (Building Base band Unit, referred to as：BBU), exchange (Alternating Current, abbreviation：AC)/
Direct current (Direct Current, referred to as：) and the equipment such as other electrical equipments DC.
In figure 3, power supply unit PDU-A includes an input jack and an output plughole, wherein, input jack is defeated to power
Enter, be connected with external power source, output plughole is connected with notebook adapters；Power supply unit PDU-B includes 5 output plugholes, point
It is not connected with industrial computer, interchanger, BBU, AC/DC and other electrical equipments.It is input to by externally fed in power distribution unit
It is provided with the power supply unit PDU-A of input jack, then the power supply unit PDU-B by being cascaded with power supply unit PDU-A is to system
In the power supply of each equipment.In addition, the input jack and output plughole in Fig. 3 are three-phase jack, and power supply unit PDU-A also includes
Lightning-protection module.
With reference to Fig. 2 and Fig. 3 structures, three kinds of circuit structures as shown in Fig. 4 A, Fig. 4 B and Fig. 4 C are can obtain.
With reference to figure 4A, the equipment connected for PDU_B, the protection of two-stage differential mode, the electricity between PDU_A and PDU_B are formed
Source line plays the effect of decoupling inductance between RV1 and RV1_1, wherein, PDU_A undertakes most of surge current, and PDU_B undertakes few
Part surge current, according to the C-V characteristic of piezo-resistance, the residual voltage at both ends is also than relatively low.
With reference to figure 4B, there is no the equipment of common mode protective device for rear end, common mode surge current is all as built in PDU_A
Piezo-resistance undertake, the common mode pulse voltage tolerance level of equipment is all higher under normal circumstances, less than pressure-sensitive electricity in PDU_A
The residual voltage of resistance.
With reference to figure 4C, there are the equipment of common mode protective device, either live wire L, or zero line N for rear end, all form two
Level differential mode protection, the power line between PDU_A and PDU_B play decoupling electricity between RV2 and RV2_2, RV3 and RV3_3 respectively
Sense acts on, and PDU_A undertakes most of surge current, and PDU_B undertakes small part surge current, special according to the volt-ampere of piezo-resistance
Property, the residual voltage at both ends is also than relatively low.
Wherein, RV1, RV2 and RV 3 is used to represent the pressure-sensitive device inside PDU_A；RV1_1, RV2_2 and RV3_3 are equal
For representing the pressure-sensitive device of load equipment, load equipment may include above-mentioned industrial computer, interchanger, BBU, AC/DC and other use
Electric equipment.Specifically, pressure-sensitive device is, for example, piezo-resistance.In other words, present document relates to piezo-resistance can also be other
Pressure-sensitive device.
Based on above-mentioned analysis, system shown in Figure 3 can be obviously improved the surge specification of common mode differential mode.
For the preset length for the power line for connecting different power supply units, can determine in several ways.
In a kind of specific implementation, preset length is the input surge according to lightning-protection module operation voltage and access load
The collaboration of protection device operation voltage determines.Wherein, lightning-protection module is built in the power supply unit for being provided with input jack.It is exemplary
Ground, other power supply units electricity access in load and at least two power supply units, being provided with outside the power supply unit of input jack
Connection.
Alternatively, preset length determines according to following manner：
1) inductance for determining power line is：L=(V2-V1)/△t；
2) according to the inductance L and empirical equation 0.9uH/m of power line, preset length is obtained.
Wherein, V1Represent lightning-protection module operation voltage, V2The input surge protection device activity voltage of access load is represented,
△ t represent the rising time of pulse surge voltage.
Next, illustrate the concrete structure of power supply unit in power distribution unit.
In the first example, the power supply unit structure comprising input jack is as shown in Fig. 5 A, Fig. 5 B and Fig. 5 C.Wherein, scheme
5A is the front view of a power supply unit in the electrical power distribution unit that the utility model embodiment provides；Fig. 5 B are that the utility model is real
The side view of a power supply unit in the electrical power distribution unit of example offer is provided；Fig. 5 C are that the power supply that the utility model embodiment provides is matched somebody with somebody
The end-view of a power supply unit in electric unit.
With reference to figure 5A, Fig. 5 B and Fig. 5 C, the power supply unit is connected by input jack with input power cord, power supply unit
One end is connected with power line, is connected by power line with next power supply unit.Such as the power supply unit is matching somebody with somebody in above-mentioned example
Electric unit PDU_A, it is connected by the power line with power supply unit PDU_B.It should be noted that size in figure, such as 179.10,
22.00,44.40,174.10 etc., merely illustrative explanation, the utility model is not limited system.
In second of example, when power distribution unit includes multiple power supply units, wherein the last power supply unit
Structure is as shown in Fig. 6 A, Fig. 6 B and Fig. 6 C.Wherein, Fig. 6 A are another in the electrical power distribution unit that the utility model embodiment provides
The front view of power supply unit；Fig. 6 B are the side view of another power supply unit in the electrical power distribution unit that the utility model embodiment provides
Figure；Fig. 6 C are the end-view of another power supply unit in the electrical power distribution unit that the utility model embodiment provides.
With reference to figure 6A, Fig. 6 B and Fig. 6 C, one end of the power supply unit is connected with power line, is matched somebody with somebody by the power line and upper one
Electric unit connects.Such as the power supply unit is the power supply unit PDU_B in above-mentioned example, it passes through the power line and power supply unit
PDU_A connections.It should be noted that size in figure, such as 299.20,22.00,44.40,294.20 etc., merely illustrative explanation, this
Utility model is not limited system.
In the third example, when power distribution unit includes multiple power supply units, wherein a middle power supply unit
Structure is as shown in figures 7 a and 7b.Wherein, Fig. 7 A are another distribution in the electrical power distribution unit that the utility model embodiment provides
The front view of unit；Fig. 7 B are the side view of another power supply unit in the electrical power distribution unit that the utility model embodiment provides.
With reference to figure 7A and Fig. 7 B, the both ends of the power supply unit are connected with power line.The power supply that the power supply unit passes through both ends
Line is connected with a upper power supply unit and next power supply unit respectively.It should be noted that size in Fig. 7 A and Fig. 7 B, such as
299.20 and 294.20 etc., merely illustrative explanation, the utility model is not limited system.
A defect also be present in existing power supply allocation unit：Single system jack, this design can only be in a kind of national standards
Region use, the power supply interface standard demand in global country variant area can not be met.It is new in this practicality to overcome the defect
In the power distribution unit that type is provided, input jack can be that the straight female or C19 of C13 are directly female.
Accordingly, power distribution unit is used cooperatively with input power cord, and the input power cord is used for power taking.Input electricity
One end plug of source line is that the straight public or C20 of C14 are directly public；The other end of the input power cord is the civil power for being adapted to multiple national standards
Plug.Wherein, mains plug can include curved public, curved public, straight public, straight public affairs of PF of PK of PD of PG, straight public, the straight public affairs of PL of the straight public affairs-I of PJ, PI,
Straight public, straight public and straight public affairs of PB of PF of PJ etc..
Specifically, table 1 shows a variety of input power cord specifications, is selected at the practical application moment according to actual use area
With one of them.
Table 1 is the input power cord specification summary sheet of the multinational standard of power distribution unit power supply
It can also be several in table 2 below that the input jack of electrical power distribution unit combines with the specification of input power cord plug
Other forms, these forms do not influence the plug specification that input power cord connects civil power one end.
The specifications design of several power supply unit A inputs jacks of table 2 and circumscripted power line plug
| Input jack | Input power cord | |
| Design 1 | C14 is directly public | C13 is directly female |
| Design 2 | C20 is directly public | C19 is directly female |
| Design 3 | C13 is directly female | C14 is directly public |
| Design 4 | C19 is directly female | C20 is directly public |
The power distribution unit that the present embodiment provides, compared to existing power supply allocation unit, at least with advantages below：
Solve the power surge protection question of outdoor simple power supply environment, improve carrying out surge protection of complete equipment etc.
Level；
Solves the problems, such as high density case and cabinet load supplying so that case and cabinet Integrated design is more compact, and equipment can be with
Power taking nearby；
Solve the problems, such as the plant-grid connection of global different electrical power standard, making for various countries' difference commercial power socket standard can be met
With.
For the portable mobile communication system of high density compact, friendship that a variety of carrying out surge protection levels built in cabinet differ
Flow electrical equipment, it is desirable to global power network specification and interface are adapted to, reference power supply allocation unit on the market can not meet to require, and
Power distribution unit interface compatibility provided by the utility model is good, carrying out surge protection ability is strong, suitable for outdoor, vehicle-mounted, portable
Rapid deployment system, or the power distribution and carrying out surge protection of similar scene AC power supply device.
The utility model also provides a kind of power distribution system, and the power distribution system is included such as above-mentioned any embodiment institute
The power distribution unit stated.
Finally it should be noted that：Various embodiments above is only to illustrate the technical solution of the utility model, rather than it is limited
System；Although the utility model is described in detail with reference to foregoing embodiments, one of ordinary skill in the art should
Understand：It can still modify to the technical scheme described in foregoing embodiments, either to which part or whole
Technical characteristic carries out equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from this practicality newly
The scope of each embodiment technical scheme of type.
Claims (10)
- A kind of 1. power distribution unit, it is characterised in that including：At least two power supply units, at least two power supply unit cascade successively；Input jack, the input jack are arranged on one end of at least two power supply unit of cascade；Multiple output plugholes, the multiple output plughole is distributed at least two power supply unit, and the multiple output Jack is to be connected in parallel.
- 2. power distribution unit according to claim 1, it is characterised in that be provided with the power supply unit of the input jack Built-in lightning-protection module.
- 3. power distribution unit according to claim 2, it is characterised in that it is gentle that the lightning-protection module includes piezo-resistance Body discharge tube.
- 4. power distribution unit according to claim 1, it is characterised in that pass through preset length between each power supply unit Power line connects.
- 5. power distribution unit according to claim 4, it is characterised in that the preset length is moved according to lightning-protection module The input surge protection device activity voltage for making voltage with access load cooperates with what is determined, wherein, the lightning-protection module is built in It is provided with the power supply unit of the input jack.
- 6. power distribution unit according to claim 5, it is characterised in that the preset length is true according to following manner It is fixed：1) inductance for determining the power line is：L=(V2-V1)/△t；2) according to the inductance L and empirical equation 0.9uH/m of the power line, the preset length is obtained；Wherein, V1Represent lightning-protection module operation voltage, V2Represent the input surge protection device activity voltage of access load, △ t tables Show the rising time of pulse surge voltage.
- 7. power distribution unit according to any one of claim 1 to 6, it is characterised in that the input jack is C13 Straight female or C19 is directly female.
- 8. power distribution unit according to any one of claim 1 to 6, it is characterised in that the power distribution unit It is used cooperatively with input power cord.
- 9. power distribution unit according to claim 8, it is characterised in that one end plug of the input power cord is C14 is straight public or C20 is directly public, and the other end of the input power cord is is adapted to the mains plug of multiple national standards, the civil power Plug includes curved public, curved public, straight public, the straight public affairs of PF of PK of PD of PG, straight public, straight public, straight public, the straight public and PB of PF of PJ of PL of the straight public affairs-I of PJ, PI It is straight public.
- 10. a kind of power distribution system, it is characterised in that the power distribution system is included such as any one of claim 1 to 9 Described power distribution unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721116391.9U CN207166139U (en) | 2017-09-01 | 2017-09-01 | Power distribution unit and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721116391.9U CN207166139U (en) | 2017-09-01 | 2017-09-01 | Power distribution unit and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207166139U true CN207166139U (en) | 2018-03-30 |
Family
ID=61719294
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721116391.9U Active CN207166139U (en) | 2017-09-01 | 2017-09-01 | Power distribution unit and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207166139U (en) |
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2017
- 2017-09-01 CN CN201721116391.9U patent/CN207166139U/en active Active
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