CN204402694U - Integrated type multi-cylinder engine combustion gas high-pressure common rail multiple spot electric-controlled injection device - Google Patents
Integrated type multi-cylinder engine combustion gas high-pressure common rail multiple spot electric-controlled injection device Download PDFInfo
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- CN204402694U CN204402694U CN201420868123.2U CN201420868123U CN204402694U CN 204402694 U CN204402694 U CN 204402694U CN 201420868123 U CN201420868123 U CN 201420868123U CN 204402694 U CN204402694 U CN 204402694U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Fuel-Injection Apparatus (AREA)
Abstract
The utility model provides a kind of integrated type multi-cylinder engine combustion gas high-pressure common rail multiple spot electric-controlled injection device.Described fuel gas ejecting device comprises rectangular body, is laterally provided with combustion gas high-pressure common rail chamber, offers one or more fuel gas inlet of leading to combustion gas high-pressure common rail chamber outside rectangular body in rectangular body; Multiple air inflow openings be communicated with cylinder of internal-combustion engine suction port is offered in the front of rectangular body, be respectively equipped with multiple fuel gas injection in the both sides of each air inflow openings and cylinder head connecting end surface to export, the outlet of multiple fuel gas injection is communicated with combustion gas high-pressure common rail chamber respectively by combustion gas through hole, is provided with the mounting interface of solenoid valve or stepper motor in the communications ports in each combustion gas through hole and combustion gas high-pressure common rail chamber; Multiple bolt hole is also offered at rectangular body.The utility model structure is simple, easy for installation, and cost is low, easy to maintenance, can realize high pressure, large discharge, regularly, the gas feeder of quantitative fuel gas injection.
Description
Technical field
It is the internal-combustion engine gas supply system field of fuel that the utility model belongs to inflammable gas, and specifically one can be arranged on the integrated type multi-cylinder engine combustion gas high-pressure common rail multiple spot electric-controlled injection device for the timing of internal combustion engine cylinder head inlet valve port, quantitative injection pressurized fuel gas between the cylinder head air intlet end face of Spark ignition type combustion gas list fuel combustion and (diesel oil-combustion gas) compression-ignited bi-fuel internal combustion engine and intake manifold end face.
Background technique
At present, the Spark ignition type combustion gas list fuel combustion of the occuping market principal status of public economy and (diesel oil-combustion gas) compression-ignited bi-fuel internal combustion engine, the intake method of combustion gas mainly contains following several:
Gas feeder structural type one: combustion gas and air enter air-intake of combustion engine house steward after mixing according to a certain percentage before internal combustion engine turbocharger, then enter each cylinder respectively and work by combustion by inlet manifold of IC engine.The form structure of this intake method is simple, and be able to extensive use in gas internal-combustion engine field, market share is the highest; But there is very large potential safety hazard in the gas supply system of this structural type: (1) is because intake manifold inside is filled with the mixed gas (being in explosion limit) of inflammable gas and air all the time, when internal-combustion engine is in scavenging process (valve overlap), inlet and outlet door is in opening state simultaneously, gas-air mixture enters in cylinder by intake valve, and enter exhaust duct by exhaust valve together with the waste gas of High Temperature High Pressure, cause after-burning (after-burning) phenomenon; (2) when internal-combustion engine is in scavenging process or be in working stroke, IC Intake Valve Closes is not tight, the waste gas of High Temperature High Pressure can enter admission line, light a large amount of gas-air mixtures of intake manifold inside, tempering is blown out and catastrophe failure or the accident such as blast to cause intake manifold to occur.
Gas feeder structural type two: combustion gas and air realize the multi-point injection of high-pressure gas Mechanical course by the structural type of fuel gas supply camshaft+valve spring assembly in inlet manifold of IC engine, the after-burning of turbosupercharging forward slip value system and the potential safety hazard of suction tude back draft can be avoided and reduce to this intake type effectively, realize multiple spot fuel gas injection at regular time and quantity, but there is many defects such as complex structure, mechanical wear is large, control accuracy is low, rate of fault is high, so be seldom used on gas internal-combustion engine.
Gas feeder structural type three: high-pressure gas is at cylinder of internal-combustion engine inner direct, and the throttling of this structural type on gaseous fuel does not affect, and makes air feed stability of characteristics; Gaseous fuel adopts by timing, quantitative accurate control high-pressure injection in cylinder, and can eliminate the phenomenon of detonation of internal-combustion engine, thermal efficiency during gas fuel combustion is high, along with service time and the delivery volume of the change energy fine adjustment combustion gas of engine conditions.But this fuel gas supply mode exists to be needed to redesign many technology barriers such as cylinder head, system architecture is complicated, development difficulty is large, cost is high, maintenance difficulty is high, does not therefore also obtain more application in gas internal-combustion engine field.
Summary of the invention
The utility model is according to existing Spark ignition type combustion gas list fuel combustion and the ubiquitous poor stability of (diesel oil-combustion gas) compression-ignited bi-fuel internal combustion engine gas supply system, delivery temperature is high, intake manifold's tempering is blown out, rate of fault is high, many technological deficiencies such as power stage is not enough, a kind of integral fuel gas high-pressure common rail multiple spot electric-controlled injection device is provided, between the cylinder head suction port end face that this device is arranged on Spark ignition type combustion gas list fuel combustion and (diesel oil-combustion gas) compression-ignited bi-fuel internal combustion engine and intake manifold end face, combustion gas can be realized mix on air-intake of combustion engine doorway with air, effectively reduce temperature of exhaust fume, reduce rate of fault, increase substantially the charging efficiency of gas internal-combustion engine, improve combustion condition and avoid the generation of phenomenon of detonation, thus ensure that the continual and steady work of gas internal-combustion engine and significantly improve gas internal-combustion engine output power.
The technological scheme that the utility model provides: described a kind of integrated type multi-cylinder engine combustion gas high-pressure common rail multiple spot electric-controlled injection device, comprise the rectangular body measure-alike with cylinder head air inlet end face, in rectangular body, be laterally provided with combustion gas high-pressure common rail chamber, outside rectangular body, offer one or more fuel gas inlet of leading to combustion gas high-pressure common rail chamber; Multiple air inflow openings be communicated with combustion engine cylinder head suction port is offered in the front of rectangular body, and the number of air inflow openings is equal with the number of cylinder of internal-combustion engine, be respectively equipped with multiple fuel gas injection in the both sides of each air inflow openings and cylinder head connecting end surface to export, the outlet of multiple fuel gas injection is communicated with combustion gas high-pressure common rail chamber respectively by combustion gas through hole, is provided with the mounting interface of solenoid valve or stepper motor in the communications ports in each combustion gas through hole and combustion gas high-pressure common rail chamber; Each combustion gas through hole upper end is by being arranged on the solenoid valve at mounting interface place of solenoid valve or stepper motor or forming combustion gas throttling control unit between the seal face of stepper motor and combustion gas high-pressure common rail chamber; Also offer at rectangular body and be multiplely connected with cylinder head and engine intake manifold the bolt hole used.
The utility model is technological scheme preferably: the port both sides that described air inflow openings engages with combustion engine cylinder head inlet valve port are plane of inclination, and described fuel gas injection outlet is all opened on the plane of inclination of each air inflow openings both sides.
The utility model is technological scheme preferably: the mounting interface of described multiple solenoid valve or stepper motor is arranged on the upper-end surface of rectangular body, and with high-pressure common rail chamber UNICOM, the seal face of each combustion gas through hole is arranged on upper-end surface and the connection position, high-pressure common rail chamber of rectangular body.
The utility model is technological scheme preferably: be arranged on each air inflow openings and export with multiple fuel gas injections of the every side of cylinder head connecting end surface and be communicated with combustion gas high-pressure common rail chamber respectively by a combustion gas through hole, each combustion gas through hole upper end forms throttling control unit by the solenoid valve of correspondence or between the seal face of stepper motor and high-pressure common rail chamber, timing is realized by the start-up time of solenoid valve and the opening degree of trunon delay time or stepper motor, quantitative combustion gas high-pressure common rail multiple spot electric-controlled injection, multiple fuel gas injection outlets of respective side are led to by multiple holes in lower end.
The utility model is technological scheme preferably: described combustion gas high-pressure common rail chamber is strip, and its sectional shape is: rectangular, circle, ellipse or the various structural type such as irregularly shaped, be arranged on the top of multiple air inflow openings.
The utility model is technological scheme preferably: the fuel gas injection of each air inflow openings and cylinder head connecting end surface both sides exports and is symmetrical arranged, and the multiple fuel gas injection outlets being arranged on the every side of each air inflow openings are vertically equally spaced on the same line.
The utility model is technological scheme preferably: described air inflow openings is equidistantly opened on rectangular body.
The utility model is technological scheme preferably: described one or more fuel gas inlet is arranged on two ends, combustion gas high-pressure common rail chamber or upper-end surface center position.
The injection apparatus that the utility model provides can realize combustion gas and mix on air-intake of combustion engine doorway with air, because air-intake of combustion engine inner manifold is pure air, avoid the intake manifold's tempering sternly do not caused because of IC Intake Valve Closes and blow out the generation of after-burning phenomenon of the failure in phenomenon of the failure and scavenging process, thus effectively can reduce temperature of exhaust fume, reduce rate of fault, on the basis of guaranteeing internal-combustion engine security feature, improve gas internal-combustion engine continuous service output significantly, in addition, this high-pressure common rail fuel gas ejecting device adopts high-pressure common rail combustion gas electric controlled multi-point to spray, the inlet valve port timing of the electronic actuators such as solenoid valve or stepper motor internal combustion engine is passed through according to the operating mode of motor, gas jet fuel quantitatively, fuel gas injection pressure is high, each cylinder fuel gas injection pressure is completely the same, high-pressure gas and pressurized air Homogeneous phase mixing in air-intake of combustion engine doorway and cylinder, increase substantially the charging efficiency of gas internal-combustion engine, improve combustion condition and avoid the generation of phenomenon of detonation, thus ensure that the continual and steady work of gas internal-combustion engine and significantly improve gas internal-combustion engine output power.
The beneficial effects of the utility model:
1. the utility model is arranged between gas internal-combustion engine cylinder head and intake manifold, air cylinder head structure without the need to combustion motor carries out any change, combustible gas list fuel combustion can either be used for, also may be used for (diesel oil-combustion gas) bi-fuel internal combustion engine, can use as the gas supply system of any structural type gas internal-combustion engine, structure is simple, assemble convenient;
2. fuel gas injection pressure of the present utility model is high, 1MPa can be reached, according to the timing of the inlet valve port of the operating mode internal combustion engine of motor, carry out fuel gas injection quantitatively, timing, quantitative combustion gas high-pressure common rail multiple spot electric-controlled injection can be realized by the start-up time of solenoid valve and the opening degree of trunon delay time or stepper motor;
3. fuel gas injection flow of the present utility model is large, and the synchronization of time for spraying and internal-combustion engine, can meet the gas supply system technical requirements of high-power Spark ignition type pure gas fuel combustion and compression-ignited (diesel oil-combustion gas) bi-fuel internal combustion engine;
4. the utility model can significantly improve the charging efficiency of gas internal-combustion engine and promote output power, combustion gas and air realize Homogeneous phase mixing in inlet valve port and cylinder, make burning more abundant, the thermal efficiency is high, and the moment of torsion of motor and power are greatly improved than the gas internal-combustion engine assembling other form gas supply system;
5. the utility model can as the gas feeder of diesel oil-combustion gas bi-fuel internal combustion engine repacking, after this device installed by diesel engine, the output power of former diesel engine and output torque substantially remain unchanged or slightly improve, diesel oil substitution rate is high, the user cost of internal-combustion engine is low, relatively former diesel engine effectively can reduce pollutant emission, all can make under various operating mode HC, CO and NOx discharge than HC, CO of the gas internal-combustion engine of other form gas supply system of assembling and NOx discharge low.
In sum, the utility model has that structure is simple, easy for installation, Security is high, reliability is high, pollutant emission is low, failure rate is low, user cost are low, keep in repair the plurality of advantages such as easy, the gas feeder that can be used as any gas internal-combustion engine uses, the fuel gas injection supply of high pressure, large discharge can be realized, and combustion gas can be sprayed according to the operating mode timing of motor, the quantitative inlet valve port to gas internal-combustion engine, the charging efficiency of effective lifting gas internal-combustion engine, reduces internal-combustion engine HC, CO and NOx emission.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is plan view of the present utility model;
Fig. 3 is left view of the present utility model;
Fig. 4 is AA ' sectional drawing in Fig. 1;
Fig. 5 is BB ' sectional drawing in Fig. 1;
Fig. 6 is the key plan of the utility model and intake manifold and cylinder head;
Fig. 7 is the enforcement illustration that the utility model installs solenoid valve;
Fig. 8 is AA ' sectional drawing in Fig. 7.
In figure: 1-rectangular body, 2-combustion gas high-pressure common rail chamber, 3-fuel gas inlet, 4-air inflow openings, 5-fuel gas injection exports, 6-combustion gas through hole, the mounting interface of 7-solenoid valve or stepper motor, 8-bolt hole, 9-intake manifold, 10-cylinder head, 11-valve, 12-solenoid valve, 13-air inlet house steward.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.As Fig. 1, a kind of integrated type multi-cylinder engine combustion gas high-pressure common rail multiple spot electric-controlled injection device shown in Fig. 3, comprise the rectangular body 1 measure-alike with cylinder head air inlet end face, laterally strip combustion gas high-pressure common rail chamber 2 is provided with in rectangular body 1, its sectional shape is: rectangular, circular, the various structural type such as oval or irregularly shaped, one or more fuel gas inlet 3 of leading to combustion gas high-pressure common rail chamber is offered outside combustion gas high-pressure common rail chamber 2, fuel gas inlet 3 is according to being opened in both sides end face or upper-end surface center position according to the size of flow, and in combustion gas high-pressure common rail chamber 2, pass into high-pressure gas by one or more fuel gas inlet 3, position below the front of rectangular body 1 and combustion gas high-pressure common rail chamber 2 offers multiple air inflow openings 4 be communicated with cylinder of internal-combustion engine suction port, the number of air inflow openings 4 is equal with the number of cylinder of internal-combustion engine, the internal-combustion engine of general six cylinders just arranges six air inflow openings 4, eight cylinders eight air inflow openings 4 (by that analogy) are just set, each air inflow openings is corresponding with the inlet valve port of one of them combustion engine cylinder head, in cylinder, carry air.As shown in Figure 5, the port both sides that described air inflow openings 4 docks with combustion engine cylinder head suction port are plane of inclination, each air inflow openings 4 with the plane of inclination of cylinder head connecting end surface both sides are arranged with multiple fuel gas injection and export 5, the multiple fuel gas injection outlets 5 being arranged on each air inflow openings 4 both sides are vertically equally spaced on the same line.
As shown in Figure 1, multiple bolt hole 8 be connected with cylinder head and engine intake manifold 9 is also offered at rectangular body 1, described bolt hole 8 is divided into two rows, and upper row is arranged between air inflow openings 4 and combustion gas high-pressure common rail chamber 2, and lower row is arranged on below air inflow openings 4.Because the intake manifold 9 of internal-combustion engine is fixed with bolts with cylinder head, so as shown in Figure 6, be opened in the bolt hole of integrated type multi-cylinder engine combustion gas high-pressure common rail multiple spot electric-controlled injection device and the bolt hole one_to_one corresponding of inlet manifold of IC engine 9 and cylinder head.Injection apparatus in Fig. 1 is applicable to six cylinder gas internal-combustion engines, and (this figure only exemplarily uses, this device is applicable to " V " type structure internal-combustion engine and the straight type configuration internal-combustion engine of any number of cylinders), conveniently install and offer 12 bolts hole, by these 12 bolts hole, combustion engine cylinder head, intake manifold 9 are connected (as shown in Figure 6) with integrated type multi-cylinder engine combustion gas high-pressure common rail multiple spot electric-controlled injection device described in the utility model, if eight cylinder formula internal-combustion engines, 16 bolts hole (by that analogy) are just set.
As shown in Figure 4, multiple fuel gas injection outlet 5 is communicated with combustion gas high-pressure common rail chamber 2 respectively by combustion gas through hole 6, be arranged on each air inflow openings 4 to export 5 with multiple fuel gas injections of the every side of cylinder head connecting end surface and be communicated with combustion gas high-pressure common rail chamber 2 respectively by a combustion gas through hole 6, each combustion gas through hole 6 and high-pressure common rail chamber 2 communications ports are provided with the mounting interface 7 of solenoid valve or stepper motor, can install solenoid valve 12 or stepper motor at the mounting interface 7 of solenoid valve or stepper motor.Corresponding fuel gas injection outlet 5 is led to by multiple holes in the lower end of each combustion gas through hole 6.As shown in Figure 2, mounting interface 7 and the seal face of each combustion gas through hole of described multiple solenoid valve or stepper motor are arranged on upper-end surface and the connection position, high-pressure common rail chamber 2 of rectangular body, convenient installation solenoid valve 12 or stepper motor.
Embodiment as shown in accompanying drawing 7 and Fig. 8 is the integrated type multi-cylinder engine combustion gas high-pressure common rail multiple spot electric-controlled injection device being installed on six cylinder gas internal-combustion engines, the utility model operationally, be directly installed between gas internal-combustion engine cylinder head and intake manifold 9, be fixedly clamped by bolt, each jointing end face is equipped with sealing rubber ring and prevents gas leakage.Injection apparatus in embodiment offers three fuel gas inlet 3, wherein two are opened in the both ends of the surface of rectangular body 1, another is opened in the upper-end surface middle position of rectangular body 1, three fuel gas inlet 3 lead to combustion gas high-pressure common rail chamber 2 respectively, high-pressure gas enters in combustion gas high-pressure common rail chamber 2 by fuel gas inlet 3, combustion gas in combustion gas high-pressure common rail chamber 2 is 6 cylinder supply high-pressure gas, and the common rail pressure of combustion gas can reach 1MPa.Injection apparatus upper-end surface is in an embodiment provided with the mounting interface 7 of 12 solenoid valves or stepper motor, solenoid valve 12 is arranged on (can according to the watt level of gas internal-combustion engine, the size of the mounting interface of configuration solenoid valve or stepper motor and quantity) on the mounting interface 7 of solenoid valve or stepper motor.When solenoid valve 12 is opened, high-pressure gas enters combustion gas through hole 6 from combustion gas high-pressure common rail chamber 2 through the gap of solenoid valve 12 core and valve seat, spray into cylinder head gas-entered passageway via multiple fuel gas injection outlet 5 again, high-pressure gas is mixed and fed into cylinder of internal-combustion engine combustion with the pressurized air entered by air inflow openings 4 at combustion engine cylinder head intake valve place and does work.When solenoid valve 12 cuts out, it is inner that combustion gas remains in high-pressure common rail chamber.Solenoid valve 12 is controlled by multiple spot electric-controlled gas spraying fire unit (ECU), ECU can according to the difference of gas internal-combustion engine operating mode, by supply moment and the delivery volume of the accurate control break combustion gas to electronic actuators such as solenoid valve 12 or stepper motors, thus realize combustion gas high-pressure common rail multiple spot electric-controlled injection function.
Claims (8)
1. an integrated type multi-cylinder engine combustion gas high-pressure common rail multiple spot electric-controlled injection device, it is characterized in that: this injection apparatus comprises the rectangular body (1) measure-alike with cylinder head air inlet end face, in rectangular body (1), be laterally provided with combustion gas high-pressure common rail chamber (2), outside combustion gas high-pressure common rail chamber (2), offer one or more fuel gas inlet (3) of leading to combustion gas high-pressure common rail chamber (2), multiple air inflow openings (4) be communicated with combustion engine cylinder head suction port is offered in the front of rectangular body (1), and the number of air inflow openings (4) is equal with the number of cylinder of internal-combustion engine, be respectively equipped with multiple fuel gas injection at each air inflow openings (4) with the both sides of cylinder head connecting end surface to export (5), multiple fuel gas injection outlet (5) is communicated with combustion gas high-pressure common rail chamber (2) respectively by combustion gas through hole (6), the mounting interface (7) of solenoid valve or stepper motor is provided with each combustion gas through hole (6) and the communications ports in combustion gas high-pressure common rail chamber (2), each combustion gas through hole (6) upper end is by being arranged on the solenoid valve at mounting interface (7) place of solenoid valve or stepper motor or forming combustion gas throttling control unit between the seal face of stepper motor and combustion gas high-pressure common rail chamber (2), rectangular body (1) is also offered multiple bolt hole (8) be connected with cylinder head (10) and engine intake manifold (9).
2. integrated type multi-cylinder engine combustion gas high-pressure common rail multiple spot electric-controlled injection device according to claim 1, it is characterized in that: the port both sides that described air inflow openings (4) engages with combustion engine cylinder head suction port are plane of inclination, described fuel gas injection outlet (5) is all opened on the plane of inclination of each air inflow openings (4) both sides.
3. integrated type multi-cylinder engine combustion gas high-pressure common rail multiple spot electric-controlled injection device according to claim 1 and 2, it is characterized in that: the mounting interface (7) of described multiple solenoid valve or stepper motor is arranged on the upper-end surface of rectangular body (1), and with high-pressure common rail chamber UNICOM.
4. integrated type multi-cylinder engine combustion gas high-pressure common rail multiple spot electric-controlled injection device according to claim 1 and 2, it is characterized in that: multiple fuel gas injections outlet (5) being arranged on the every side of each air inflow openings (4) are communicated with combustion gas high-pressure common rail chamber (2) respectively by a combustion gas through hole (6), this combustion gas through hole (6) upper end connects with the mounting interface (7) of corresponding solenoid valve (12) or stepper motor, and multiple fuel gas injections outlet (5) of respective side are led to by multiple holes in lower end.
5. integrated type multi-cylinder engine combustion gas high-pressure common rail multiple spot electric-controlled injection device according to claim 1 and 2, it is characterized in that: described combustion gas high-pressure common rail chamber (2) is strip, is arranged on the top of multiple air inflow openings (4).
6. integrated type multi-cylinder engine combustion gas high-pressure common rail multiple spot electric-controlled injection device according to claim 1 and 2, it is characterized in that: fuel gas injection outlet (5) of each air inflow openings (4) both sides is symmetrical arranged, multiple fuel gas injections outlet (5) being arranged on the every side of each air inflow openings (4) are vertically equally spaced on the same line.
7. integrated type multi-cylinder engine combustion gas high-pressure common rail multiple spot electric-controlled injection device according to claim 1 and 2, is characterized in that: described air inflow openings (4) is equidistantly opened on rectangular body (1).
8. integrated type multi-cylinder engine combustion gas high-pressure common rail multiple spot electric-controlled injection device according to claim 1 and 2, is characterized in that: described one or more fuel gas inlet (3) is arranged on (2) two ends, combustion gas high-pressure common rail chamber or upper-end surface center position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420868123.2U CN204402694U (en) | 2014-12-31 | 2014-12-31 | Integrated type multi-cylinder engine combustion gas high-pressure common rail multiple spot electric-controlled injection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420868123.2U CN204402694U (en) | 2014-12-31 | 2014-12-31 | Integrated type multi-cylinder engine combustion gas high-pressure common rail multiple spot electric-controlled injection device |
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| Publication Number | Publication Date |
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| CN204402694U true CN204402694U (en) | 2015-06-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420868123.2U Active CN204402694U (en) | 2014-12-31 | 2014-12-31 | Integrated type multi-cylinder engine combustion gas high-pressure common rail multiple spot electric-controlled injection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204402694U (en) |
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2014
- 2014-12-31 CN CN201420868123.2U patent/CN204402694U/en active Active
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