CN107620698A - A kind of turbo charged air compressor set - Google Patents
A kind of turbo charged air compressor set Download PDFInfo
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- CN107620698A CN107620698A CN201710957212.2A CN201710957212A CN107620698A CN 107620698 A CN107620698 A CN 107620698A CN 201710957212 A CN201710957212 A CN 201710957212A CN 107620698 A CN107620698 A CN 107620698A
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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
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Abstract
The invention discloses a kind of turbo charged air compressor set, and it includes air cleaner, intake valve, motor, air compressor, gs-oil separator, oil cooler, oil filter；The output end connection air compressor of motor；The outlet of air compressor connects gs-oil separator by pipeline；The entrance of the air outlet slit connection air maim of gs-oil separator, lubricating oil outlet connect the entrance of lubricating oil pipeline；The outlet oil cooler of lubricating oil pipeline；Oil cooler is sequentially communicated oil filter and air compressor by pipeline；Also include turbocharger；Turbocharger is divided into air end of booster and turbine end, and turbine end connects the outlet of air maim, the outlet of air end of booster connection air cleaner and the air intake of air compressor.For the present invention by increasing turbocharger, turbocharger provides pre- pressurized air to air compressor by air compressor exhaust gas drive, improves air compressor efficiency.
Description
Technical field
The invention belongs to air compressor technical field, and in particular to a kind of turbo charged air compressor set.
Background technology
In recent years, as the transfer of global Compressor Manufacturing industry, China progressively develop into the production system of global compressor
Base is made, sustainable growth of the domestic and international market to compressor kind and quantity demand, has promoted rising abruptly for China's Compressor Manufacturing Industry
Rise, and progressively reached higher industry production manufacture level.
Because screw air compressor has energy-conservation, the clear superiority such as efficient, highly reliable, noise is low, the present is suitable for
The development need in compressor market afterwards, its market demand will be far longer than the growth rate of traditional compressor, especially in " low-carbon
Environmental protection " Energy Conservation trend under, domestic mine, metallurgy, electric power, electronics, machine-building, medicine, food, weaving light industry and
The industries such as petrochemical industry increase the demand of screw air compressor year by year, 2016, the city of domestic screw air compressor
Field demand alreadys exceed 380,000, and the average annual growth of the coming years will remain in more than 20%.
Under the overall background of energy-conserving and environment-protective, to the power conservation requirement of screw air compressor also more and more higher, current domestic factory
Family is carried from optimization screw rotor molded line, research and development two-stage screw air compressor, using the technological means such as frequency conversion and double frequency conversions
The efficiency of high compressor system, certain effect is obtained, but also increase manufacturing cost and maintenance cost simultaneously.
Screw air compressor system conventional at present is shown in Fig. 1, includes air cleaner 100 in system, intake valve 200,
Motor 300, air compressor 400, gs-oil separator 500, oil cooler 600, oil filter 700, aerial cooler
800.Motor 300 operates with engine-driven air compressor 400, and it is to utilize the suction force of air compressor 400, fresh air that air, which enters,
Intake valve 200 is arrived after being filtered by air cleaner 100, the air entry of air inlet compressor 400, engagement pressure is rotated by rotor
Contracting, the gas mixture after compression exports from air compressor 400 discharges, into gs-oil separator 500, the high temperature after separation
Gas exports after being cooled down again by aerial cooler 800, and the lubricating oil isolated passes through lubricating oil after the cooling of oil cooler 600
Filter 700 is filtered, and returns air compressor 400, and cooling and lubricating is carried out to rotor.
The air pressure of the entrance of air compressor 400 is negative pressure in Fig. 1, causes for screw rotor to increase without the air of abundance
Pressure, compressed at present using the length of increase screw rotor or using bipolar compression (Fig. 2), to ensure compressed air discharge
Pressure meets needs, and existing bipolar screw air compressor is paid by double stage compressor housing 401, one stage of compression screw rotor
402nd, two-stage compression screw rotor pays the parts such as 403, bearing 404 and synchromesh gear 405 composition, and structure is more complicated, while also increases
Manufacturing cost and maintenance cost are added；
As a result of the length for increasing screw rotor or using bipolar compression (two pairs of negative and positive rotors) come compressed air, sky
Gas compression process in screw air compressor lengthens, and the row's temperature rise behind whirlpool of the compression terminal air made (commonly reaches 100-120
DEG C), it is necessary to the area of dissipation of increasing oil cooler 6 and aerial cooler 8 is taken to control oil temperature and compressed air to arrange
Go out temperature (general control is between 75-90 DEG C), arrange temperature increase and the increasing of cooler all reduces the energy of compressor assembly
Effect, while larger cooler also increases manufacturing cost.
The content of the invention
In view of the shortcomings of the prior art, it is a primary object of the present invention to provide a kind of turbo charged air compressor dress
Put.
To realize aforementioned invention purpose, the technical solution adopted by the present invention includes：
The invention provides a kind of turbo charged air compressor set, including air cleaner, intake valve, motor,
Air compressor, gs-oil separator, oil cooler, oil filter；The output end of the motor connects the air pressure
Contracting machine；The outlet of the air compressor connects gs-oil separator by pipeline；The air outlet slit of the gs-oil separator connects
The entrance of a logical air maim, lubricating oil outlet connect the entrance of a lubricating oil pipeline；The outlet of the lubricating oil pipeline connects
Logical oil cooler；The oil cooler is sequentially communicated oil filter and air compressor by pipeline；Also include turbine
Booster；The turbocharger is divided into air end of booster and turbine end；The turbine end of the turbocharger connects the air master
The outlet of pipeline；The air end of booster of the turbocharger connects the outlet of the air cleaner and the air compressor.
Preferably, the air maim is divided into the first air branch pipe road and the second air branch through a three-way flow regulating valve
Pipeline；The aerial cooler of outlet one on the first air branch pipe road；The outlet connection institute on the second air branch pipe road
State the turbine end of turbocharger.
Preferably, the turbocharger includes housing, turbine, calm the anger wheel, connecting shaft, support member, nozzle, oil sump, pressure
Gas end air inlet passage, air end of booster air outlet passageway, turbine end compressed air inlet channel, turbine end compressed air outlet
Passage；The wheel of calming the anger is arranged on the both ends of connecting shaft with the turbine；The connecting shaft is by supports support；The support member
It is immersed in the oil sump；The nozzle is arranged in turbine end compressed air inlet channel.
Preferably, the pipe section product of the turbine end compressed air inlet channel is less than turbine end compressed air outlet passageway
Pipe section product.
Preferably, the support member is cylindrical bearing or bearing holder (housing, cover).
Preferably, the housing is provided with oil inlet pipe and oil outlet pipe；The air compressor and the lubricating oil
An oil flow regulating valve is connected on pipeline between filter；The oil flow regulating valve connects oil inlet by pipeline
Pipe；The oil outlet pipe connects the air compressor by pipeline；The air compressor is adjusted with the oil flow
A lubricating oil check valve is provided between valve.
Preferably, turbo charged air compressor set provided by the invention also includes pressure sensor, and the pressure passes
Sensor is arranged at the air inlet of the air compressor.
Preferably, the air compressor is screw air compressor or piston type air compressor.
Compared with prior art, advantages of the present invention includes：
1st, the invention provides a kind of turbo charged air compressor set, by setting up a whirlpool in compressor inlet
Booster is taken turns, mechanical energy can be converted into heat energy using the partial pressure of air compressor exhaust, make turbocharger by normal pressure
Air does precommpression and is sent into air compressor import, reduces the compression load of air compressor in itself, while can shorten screw rod sky
The length of air compressor rotor or cancellation two-stage screw compression are changed to single stage screw compression or reduce multi-level piston compression set.
2nd, partial heat energy is converted into mechanical energy and is promoted supercharging by the present invention using the thermal expansion of air compressor discharge gas
The turbine end of device turbine rotation, can effectively reduce compressed air temperature, further reduce aerial cooler heat exchange area or
Directly cancel aerial cooler to set；So as to reduce manufacture and the maintenance cost of compressor set to greatest extent, work(is compared in reduction
Rate score, improve the efficiency and economy of whole system.
Brief description of the drawings
Fig. 1 is existing screw air compressor schematic device；
Fig. 2 is existing nose of double-screw air compressor schematic diagram；
Fig. 3 is the structural representation of the turbo charged air compressor set in a wherein embodiment of the invention；
Fig. 4 is the cross-sectional view of turbine turbocharger of the present invention；
Fig. 5 is the structural representation without the turbo charged air compressor set of aerial cooler.
In Fig. 1-Fig. 2:100- air cleaners；200- intake valves；300- motor；400- screw air compressors；
401- double stage compressor housings；402- one stage of compression screw rotor is paid；403- two-stage compressions screw rotor is paid；404- bearings；
405- synchromesh gears；500- gs-oil separators；600- oil coolers；700- oil filters：800- aerial coolers；
In Fig. 3-Fig. 5；1- air cleaners；2- intake valves；3- motor；4- air compressors；5- gs-oil separators；
6- oil coolers；7- oil filters；8- aerial coolers；9- turbocharger；10- three-way flow regulating valves；11- is pressed
Force snesor；12- oil flow regulating valves；13- lubricating oil check valves；101- housings；102- turbines；103- calms the anger wheel；104- connects
Spindle；105- bearings；106- nozzles；107- oil sumps；108- oil inlet pipes；109- oil outlet pipes；110- air end of booster air
Inlet channel；111- air end of booster air outlet passageways；112- turbine end compressed air inlet channels；The compression of 113- turbine ends is empty
Gas outlet passageway；114- air maims；115- lubricating oil pipelines；The first air branch pipes of 116- road；The air branch pipes of 117- second
Road.
Embodiment
More detailed explanation will hereafter be made to technical scheme.It is understood, however, that in model of the present invention
, can between above-mentioned each technical characteristic of the invention and each technical characteristic specifically described in below (eg embodiment) in enclosing
It is combined with each other, so as to form new or preferable technical scheme.As space is limited, no longer tire out one by one herein and state.
Embodiment 1
It is empty the invention provides turbocharging as shown in Figs. 3-4 in order to solve technical problem present in background technology
Air compressor device.The turbo charged air compressor set includes air cleaner 1, intake valve 2, motor 3, air compression
Machine 4, gs-oil separator 5, oil cooler 6, oil filter 7, aerial cooler 8, turbocharger 9, three-way flowrate regulation
Valve 10 and pressure sensor 11, oil flow regulating valve 12, lubricating oil check valve 13.
The output end of the motor 3 connects the air compressor 4, to directly drive the head of air compressor 4.
Preferably to improve efficiency, the 3 preferred magneto of motor.
The air compressor 4 is screw air compressor or piston type air compressor.
When from screw air compressor, directly driven by the motor 3.The motor 3 and air screw pressure
The kind of drive between contracting machine can be belt transmission or shaft coupling transmission；Can also be by motor and screw air compressor
Male rotor be coaxially disposed, so as to improve transmission efficiency.In order to improve the compression efficiency of the screw air compressor, can incite somebody to action double
Level screw compression is changed to single stage screw compression, so as to simplify compressor arrangement, reduces manufacturing cost and maintenance cost, improves economical
Benefit.
When from Multi-stage piston type air compressor, in order to reach simplified structure, manufacturing cost and maintenance cost are reduced,
The purpose increased economic efficiency, two level pressure such as can be changed to by three stage compression by reducing piston type air compressor number of compression stages
Contracting, two-stage compression are changed to the modes such as one stage of compression to realize.
The outlet of the air compressor 4 connects gs-oil separator 5 by pipeline.The gs-oil separator 5 is provided with one
Air outlet slit and lubricating oil outlet, the air outlet slit connect the entrance of an air maim 114, the lubricating oil outlet connection
The entrance of one lubricating oil pipeline 115.The outlet oil cooler 6 of the lubricating oil pipeline 115, the oil cooler 6
Oil filter 7 and air compressor 4 are sequentially communicated by pipeline.The air maim 114 is through three-way flow regulating valve 10
It is divided into the first air branch pipe road 116 and the second air branch pipe road 117；The outlet air on the first air branch pipe road 116
Cooler 8；The outlet on the second air branch pipe road 117 connects the turbocharger 9.
The air compressor 4 is compressed using the engagement rotation of negative and positive screw rod to air, and by the oil gas of HTHP
Mixture is sent to gs-oil separator 5 and separated, and the HTHP air after separation is by three-way flow regulating valve 10, by a part
Turbocharger 9 is sent to by the second air branch pipe road 117, to drive turbocharger 9 to rotate；The turbocharger 9
It is then sent through after pre- supercharging is done to the air after filtering in the air compressor 4；Another part compressed air passes through the first air
Bye-pass 116 is directly sent to aerial cooler 8, and the aerial cooler 8 exports after the compressed air of high temperature is cooled down.Through oil gas
Lubricating oil after separator 5 separates is discharged into lubricating oil pipeline 115 through lubricating oil outlet, then is sent into lubricating oil by lubricating oil pipeline 115
Cooler 6 cools down；The oil cooler 6 cools down high temperature grease, is sent to the oil filter 7；The lubricating oil filtering
The lubricating oil filtered after cooling down is transported to the internal lubrication of air compressor 4 and cooling screw rotor by device 7 again.
As shown in Figures 3 and 4, the turbocharger 9 is divided for air end of booster and turbine end.The air end of booster connects the air
Cleaner 1, the dust and particle that the air cleaner 1 is crossed in air filtering.The air end of booster connects institute by the intake valve 2
State the air inlet of air compressor 4.The intake valve 2 is arranged at the air inlet of the air compressor 4, to adjust entrance
The air inflow of air compressor 4 and switch opportunity.
The pressure sensor 11 is installed at the air inlet of the air compressor 4, the pressure sensor 11 is used for
Detection actually enters the air pressure of air compressor 4, and pressure signal is converted into the electricity of 0-4 milliamperes or 0-20 milliamperes
Signal, then electric signal is sent to amplifier, three-way flow regulating valve 10 is controlled by amplifier, passes through the pressure sensor 11
Detection data carry out the aperture of adjustment control three-way flow regulating valve 10, make the amount of charge air of turbocharger 9 and the sky
The demand of air compressor 4 is controlled at 2-3 times, is more matched.
The three-way flow regulating valve 10 controls its aperture by the pressure signal of pressure sensor 11, from gs-oil separator
5 high temperature and high pressure gas out are through three-way flow regulating valve 10, and when air compressor 4 unloads, three-way flow regulating valve 10 is all
Close, turbocharger 9 does not work, and when 4 normal work of air compressor, three-way flow regulating valve 10 is fully open, compression
Air all arrives at the turbine end of turbocharger 9, and the compressed air after the turbine end expansion of turbocharger 9 arrives air again
Cooler 8 cools down, and is supplied to mechanism of qi structure.The three-way flow regulating valve 10 is believed according to the pressure of the pressure sensor 11
Number, it can automatically adjust and be allowed to be in suitable aperture state, such Partial shrinkage air to the turbine of turbocharger 9
End, Partial shrinkage air directly arrive aerial cooler 8 and cooled down, and reach turbocharger 9 and the air inflow of the air compressor 4
Matching and stable state to setting.
The replacement of mechanical turbine booster also can be selected in the turbocharger 9.When from mechanical turbine booster 9,
Motor can be used to directly drive.Motor imparts power to mechanical turbine increasing by the way of belt transmission or coaxial transmission
Depressor.The motor for providing driving can be that the main motor of air compressor machine can also be external small machine to directly drive.
The concrete structure of turbocharger is described in detail below：
As shown in figure 4, the turbocharger includes housing 101, turbine 102, wheel 103 of calming the anger, connecting shaft 104, support
Part 105, nozzle 106, oil sump 107, turbine end compressed air inlet channel 112, turbine end compressed air outlet passageway 113, pressure
Gas end air inlet passage 110, air end of booster air outlet passageway 111.
The air end of booster air inlet passage 110 and air end of booster air outlet passageway 111 are opened in the air end of booster.It is described
Turbine end compressed air inlet channel 112 and turbine end compressed air outlet passageway 113 are opened in turbine end.The turbine side pressure
The pipe section product of contracting air inlet passage 112 is accumulated less than the pipe section of turbine end compressed air outlet passageway 113.Preferably, whirlpool
Take turns the pipe section product of side pressure contracting air inlet passage 112 and the pipe section product ratio of the turbine end compressed air outlet passageway 113
Example is 1:3.Accelerate turbine 102 to rotate and caused heat energy by the thermal expansion of compressed air, partial heat energy is converted into machinery
Can, while reduce compressed air delivery temperature.
It is described calm the anger wheel 103 and the turbine 102 be arranged on connecting shaft 104 both ends, the connecting shaft 104 is by support member
105 supports；The support member 105, which is immersed in the oil sump 107, to be lubricated.The nozzle 106 is arranged on turbine end compressed air
In inlet channel 112, continuously it is ejected on turbine 102 using the high temperature compressed air come out from gs-oil separator 5, in high pressure height
Under the pressure energy of warm air and the collective effect of heat energy, turbine 102 is promoted to run at high speed, the turbine 102 to run at high speed passes through company
Spindle 104 makes to calm the anger wheel 103 synchronous high-speeds operating, and the fresh air of suction is done precommpression by wheel 103 of calming the anger, by it is described enter
Air valve 2 is sent to air compressor 4, there is provided to 2-3 times of precompressed air of 4 normal air demand of air compressor, by original air
Entrance negative pressure (vacuum) state change of compressor 4 is born so as to reduce air compressor 4 compression of itself into barotropic state
Lotus, improve gas producing efficiency.The admission pressure of air compressor 4 is changed into malleation from negative pressure, in effective appearance of equal molded lines of rotor
Under product, the pressure at expulsion of air compressor 4 can be improved；On the premise of same pressure at expulsion is ensured, rotor length can be shortened, reduced
The load of air compressor 4 and manufacturing cost, improve compression efficiency.
The support member 105 is cylindrical bearing or bearing holder (housing, cover).Cylindrical bearing or bearing holder (housing, cover), which are immersed in oil sump 107, to be lubricated,
Lubricating oil in oil sump 107 can add in advance, can also use the lubrication oil circulation after cooling to being lubricated in oil sump 107
And cooling.
The concrete mode of lubricating oil using cooling circulation is：Oil inlet pipe 108 is set on the housing 101 and slided
Oil export pipe 109；And oil flow tune is connected on the pipeline between the oil filter 7 and the air compressor 4
Save valve 12；The oil flow regulating valve 12 connects oil inlet pipe 108 by pipeline；Oil outlet pipe 109 is connected by pipeline
Connect the air compressor 4；A lubricating oil check valve is provided between the air compressor 4 and the oil flow regulating valve 12
13.Oil inlet pipe 108 circulation of the lubricating oil portion through turbocharger 9 after cooling introduces the oil sump 107 of turbocharger 9
Support member 105 is done and lubricates and cools down, air compressor 4 is then returned to by oil outlet pipe 109 again.The lubricating oil check valve
13, the lubricating oil for ensureing to be come by oil flow regulating valve 12 can be sent to the internal lubrication of screw air compressor 4 and cooling screw turns
Son.
Embodiment 2
In order to solve technical problem of the prior art, the present invention also provides another technical scheme.
As shown in figure 5, the turbo charged air compression set that the embodiment provides, as different from Example 1：Directly take
Disappeared the setting of aerial cooler 6, makes the manufacturing cost of whole blowing plant reduce, improves the economy of device.
Due to the effect of turbocharger 9, the inlet air pressure of air compressor 4 becomes malleation by negative pressure, effectively
Reduce the compression load of air compressor 4 and delivery temperature, the compressed air of the high temperature turbine end nozzle through turbocharger 9 again
106th, the thermal expansion of turbine end compressed air inlet channel 112, turbine end compressed air outlet passageway 113 and inner chamber, by part
Heat energy changes into mechanical energy so that and the compressed air temperature of turbine end discharge is significantly reduced, therefore in the present embodiment 2
In, aerial cooler setting is directly eliminated, makes the manufacturing cost of whole air compressor system reduce, improves the economy of system
Property.
The technology contents and technical characteristic of the present invention have revealed that as above, but those skilled in the art still may base
Make a variety of replacements and modification without departing substantially from spirit of the present invention, therefore, the scope of the present invention in teachings of the present invention and announcement
The content disclosed in embodiment should be not limited to, and various replacements and modification without departing substantially from the present invention should be included, and is this patent Shen
Please claim covered.
Claims (8)
1. a kind of turbo charged air compressor set, including air cleaner (1), intake valve (2), motor (3), air pressure
Contracting machine (4), gs-oil separator (5), oil cooler (6), oil filter (7)；The output end connection institute of the motor (3)
State air compressor (4)；The outlet of the air compressor (4) connects gs-oil separator (5) by pipeline；The oil gas point
Air outlet slit from device (5) connects the entrance of an air maim (114), and lubricating oil outlet connects a lubricating oil pipeline (115)
Entrance；The outlet oil cooler (6) of the lubricating oil pipeline (115)；The oil cooler (6) by pipeline according to
Secondary connection oil filter (7) and air compressor (4)；It is characterized in that：Also include turbocharger (9)；The turbine increases
Depressor (9) is divided into air end of booster and turbine end, and the turbine end connects the outlet of the air maim (114)；The air end of booster
Connect the outlet of the air cleaner (1) and the air intake of the air compressor (4).
2. turbo charged air compressor set according to claim 1, it is characterised in that：The air maim
(114) it is divided into the first air branch pipe road (116) and the second air branch pipe road (117) through a three-way flow regulating valve (10)；It is described
The aerial cooler of outlet one (8) on the first air branch pipe road (116)；The outlet of the second air branch pipe road (117) connects
Connect the turbine end of the turbocharger (9).
3. turbo charged air compressor set according to claim 2, it is characterised in that：The turbocharger (9)
Including housing (101), turbine (102), wheel (103) of calming the anger, connecting shaft (104), support member (105), nozzle (106), oil sump
(107), air end of booster air inlet passage (110), air end of booster air outlet passageway (111), turbine end compressed air inlet channel
(112), turbine end compressed air outlet passageway (113)；It is described to calm the anger wheel (103) and the turbine (102) is arranged on connecting shaft
(104) both ends；The connecting shaft (104) is supported by support member (105)；The support member (105) is immersed in the oil sump
(107) in；The nozzle (106) is arranged in turbine end compressed air inlet channel (112).
4. turbo charged air compressor set according to claim 3, it is characterised in that：The turbine end compressed air
The pipe section product of inlet channel (112) is accumulated less than the pipe section of the turbine end compressed air outlet passageway (113).
5. turbo charged air compressor set according to claim 3, it is characterised in that：The support member (105) is
Cylindrical bearing or bearing holder (housing, cover).
6. turbo charged air compressor set according to claim 3, it is characterised in that：Set on the housing (101)
There are oil inlet pipe (108) and oil outlet pipe (109)；Between the air compressor (4) and the oil filter (7)
An oil flow regulating valve (12) is connected on pipeline；The oil flow regulating valve (12) connects oil inlet pipe by pipeline
(108)；The oil outlet pipe (109) connects the air compressor (4) by pipeline；The air compressor (4) and institute
State and be provided with a lubricating oil check valve (13) between oil flow regulating valve (12).
7. turbo charged air compressor set according to claim 1, it is characterised in that：Also include pressure sensor
(11), the pressure sensor (11) is arranged at the air inlet of the air compressor (4).
8. turbo charged air compressor set according to claim 1, it is characterised in that：The air compressor (4)
For screw air compressor or piston type air compressor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710957212.2A CN107620698B (en) | 2017-10-16 | 2017-10-16 | Turbocharged air compressor apparatus |
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|---|---|---|---|
| CN201710957212.2A CN107620698B (en) | 2017-10-16 | 2017-10-16 | Turbocharged air compressor apparatus |
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| CN107620698B CN107620698B (en) | 2023-07-07 |
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| CN109373626A (en) * | 2018-09-04 | 2019-02-22 | 北京航空航天大学 | A kind of air swell refrigeration system of the high adaptability based on compressed air accumulation of energy |
| CN111237099A (en) * | 2020-02-19 | 2020-06-05 | 中国船舶重工集团公司第七一一研究所 | High EGR rate single cylinder engine exhaust gas recirculation system with filtering device |
| CN112727729A (en) * | 2021-02-25 | 2021-04-30 | 董可俊 | Reciprocating piston type air compressor |
| CN113606724A (en) * | 2021-08-09 | 2021-11-05 | 兰州大学 | Anti-infection nursing device and using method thereof |
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