CN208192103U - A kind of tobacco humidifying machine pumped vacuum systems - Google Patents
A kind of tobacco humidifying machine pumped vacuum systems Download PDFInfo
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- CN208192103U CN208192103U CN201820743111.5U CN201820743111U CN208192103U CN 208192103 U CN208192103 U CN 208192103U CN 201820743111 U CN201820743111 U CN 201820743111U CN 208192103 U CN208192103 U CN 208192103U
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Abstract
The utility model discloses a kind of tobacco humidifying machine pumped vacuum systems, belong to technical field of tobacco machinery.It includes main pipeline, bypass duct and cooling water recirculation system, main pipeline includes the section in parallel positioned at pumping leading portion and the trunk section positioned at pumping back segment, bypass duct is in parallel with section in parallel, bypass duct is consistent with the pumping direction of trunk section, section in parallel is equipped with the Roots vaccum pump that two-stage is serially connected, trunk section is equipped with fore pump, and bypass duct is equipped with booster pump, is equipped with valve on section in parallel and bypass duct.The system that the system can substitute original multistage steam jet pump completely, can not only reduce the dosage of steam, also have the characteristics that energy conservation, it is possible to reduce the discharge of pollutant.
Description
Technical field
The utility model relates to technical field of tobacco machinery, particularly relate to a kind of tobacco humidifying machine pumped vacuum systems.
Background technique
In tobacco business, most of tobacco factories and Redrying Factory are made broken to reduce tobacco leaf in subsequent machining technology, and go
Except the blue foreign smell taste inside tobacco leaf, tobacco leaf is heated using vacuum conditioner in the first procedure plus tide is handled.
Vacuum conditioner is mainly used on primary processing line or threshing and redrying production line, is divided to online and two kinds of off-line type rule
Lattice, effect are to carry out vacuum conditioning processing to piece cigarette, cigarette or scattered cigarette, improve the flexibility and crush resistance of tobacco leaf, improve
The resist processing of tobacco leaf, loose tobacco leaf, and equably increase certain temperature and moisture content, mitigate the blue foreign smell in smoked sheet, also
It can play the role of a degree of desinsection to go out ovum.
Currently, most widely used vaccum-pumping equipment is steam jet pump pumped vacuum systems in tobacco business, it is using more
The concatenated steam jet pump of grade realizes the vacuum acquirement in vacuum conditioner.But, real since steam jet pump belongs to kinetic energy pump
When existing vacuum requirement, need to consume a large amount of steam and cooling water, it is therefore desirable to generate a large amount of waste water, especially steam and condense
Soft water and cooling water afterwards enters cesspool jointly, causes great waste.In addition, the source of steam relies primarily on coal-fired pot
Furnace, therefore indirectly cause the pollution of air and the discharge of other waste water.In short, the steam jet pump using plural serial stage takes up an area
Area is very big, and when operation, due to high fever, high humility, operating environment is excessively poor.
With the raising of domestic mechanical manufacturing technology, domestic machinery formula vacuum pump quality stability is largely increased, state
Outer correlation esbablished corporation also does factory in succession at home, and oil-sealed rotary pump and price of spare parts are also relatively reasonable.But in the prior art
Mechanical pump pumped vacuum systems is not applied to still the trial of tobacco humidifying machine.
Utility model content
In view of this, the utility model proposes a kind of tobacco humidifying machine pumped vacuum systems, which can substitute original completely
The system of some multistage steam jet pumps, can not only reduce the dosage of steam, also have the characteristics that energy conservation, it is possible to reduce dirty
Contaminate the discharge of object.
Based on above-mentioned purpose, technical solution provided by the utility model is:
A kind of tobacco humidifying machine pumped vacuum systems comprising main pipeline, bypass duct and cooling water recirculation system, the master
Pipeline includes the section in parallel positioned at pumping leading portion and the trunk section positioned at pumping back segment, the bypass duct and the section phase in parallel
Parallel connection, the bypass duct is consistent with the pumping direction of the trunk section, and the parallel connection section is equipped with sieve that two-stage is serially connected
Thatch vacuum pump, the trunk section are equipped with fore pump, and the bypass duct is equipped with booster pump, the parallel connection section and bypass duct
On be equipped with valve；
The cooling water recirculation system includes cooler, condenser, circulating water cooling tower, cyclic water tank and recirculated water
Pump, in which:
Cooler is set to final stage Roots vaccum pump exhaust ports；
Condenser is set in trunk section, and between final stage Roots vaccum pump and fore pump；
The water outlet side of cyclic water tank and circulating water cooling tower composition loop, cyclic water tank and circulating water cooling tower is respectively provided with
One water circulating pump；
In addition, the circulating water cooling tower is also connected to provide cooling water for them with the cooler and condenser, institute
State the cooling water return water that cyclic water tank is also used to receive the cooler and condenser.
Optionally, only has a booster pump for pumping on the bypass duct, and the booster pump is steam jet pump.
Optionally, the valve is Pneumatic butterfly valve, all aspiration pumps in line segments where the valve is arranged at it
Front end.
Optionally, the condensation-water drain of the condenser is connected to the cooling water recirculation system.
Optionally, the fore pump is liquid rotary pump or dry vacuum pump.
Optionally, the fore pump is liquid rotary pump, and the liquid rotary pump and the cyclic water tank constitute circuit, the liquid rotary pump
Demister is equipped between the cyclic water tank.
From narration above as can be seen that the beneficial effect of technical solutions of the utility model is:
1, the utility model increases a bypass duct on main pipeline, and one is configured on the bypass duct for taking out
The booster pump of gas can greatly improve the exhaust capacity of fore pump.In this way, compared to the mechanical pump technique system of only main pipeline
System, this system can choose the fore pump of more small machine power.
2, the utility model using booster pump the initial stage that vacuumizes high-efficiency air suction ability and Roots vaccum pump in high vacuum
The high-efficiency air suction ability in stage is combined with each other, and may be implemented most efficiently to be evacuated combination.Wherein, booster pump can be sprayed using steam
Pump is penetrated, in this way, only consuming factory's residue steam in a short period of time, sprays pump technique compared to original multistage steam, this is new
Type considerably reduces the consumption of a large amount of steam, while taking full advantage of the residue steam of factory, has energy-efficient advantage.This
Outside, for other opposite mechanical vacuum units, more low-power machine, which can be used, in this system can reach higher efficiency, energy conservation
Effect is more obvious.
3, this system is in the course of work of second stage, it is only necessary to a prime pump operation, Roots vaccum pump and pressurization
Pump can be out of service, also, the fore pump of this system inherently belongs to smaller power, to realize more efficient section
Energy.Meanwhile the pumping of second stage has injury to Roots vaccum pump, in this regard, this system can be very good using bypass duct again
Roots vaccum pump is protected, keeps whole system operation more safe and reliable.
Detailed description of the invention
Fig. 1~3 are a kind of structural schematic diagram of tobacco humidifying machine pumped vacuum systems in the utility model embodiment；Wherein,
Part shown in Fig. 1 is located at the top of part shown in Fig. 2, and part shown in Fig. 3 is located at the left side of part shown in Fig. 2, and Fig. 1~3 are common
Form the tobacco humidifying machine pumped vacuum systems in embodiment；
Fig. 4 is the structural schematic diagram of vacuum conditioning three-level steam jet pump in the prior art.
Specific embodiment
Understanding for the ease of those skilled in the art to the art of this patent scheme, meanwhile, in order to make the technology of this patent
Purpose, technical scheme and beneficial effects are clearer, and support the protection scope of claims sufficiently, below with tool
The form of body case makes further, more detailed description to the technical solution of this patent.
A kind of tobacco humidifying machine pumped vacuum systems comprising main pipeline, bypass duct and cooling water recirculation system, the master
Pipeline includes the section in parallel positioned at pumping leading portion and the trunk section positioned at pumping back segment, the bypass duct and the section phase in parallel
Parallel connection, the bypass duct is consistent with the pumping direction of the trunk section, and the parallel connection section is equipped with sieve that two-stage is serially connected
Thatch vacuum pump, the trunk section are equipped with fore pump, and the bypass duct is equipped with booster pump, the parallel connection section and bypass duct
On be equipped with valve；
The cooling water recirculation system includes cooler, condenser, circulating water cooling tower, cyclic water tank and recirculated water
Pump, in which:
Cooler is set to final stage Roots vaccum pump exhaust ports；
Condenser is set in trunk section, and between final stage Roots vaccum pump and fore pump；
The water outlet side of cyclic water tank and circulating water cooling tower composition loop, cyclic water tank and circulating water cooling tower is respectively provided with
One water circulating pump；
In addition, the circulating water cooling tower is also connected to provide cooling water for them with the cooler and condenser, institute
State the cooling water return water that cyclic water tank is also used to receive the cooler and condenser.
Optionally, only has a booster pump for pumping on the bypass duct, which can spray using steam
Pump is penetrated, the booster pump of other forms can also be used.
Optionally, the valve is Pneumatic butterfly valve, all aspiration pumps in line segments where the valve is arranged at it
Front end.In addition, the valve of other forms can also be used in valve.
Optionally, the condensation-water drain of the condenser is connected to the cooling water recirculation system.
Optionally, the fore pump is liquid rotary pump or dry vacuum pump.
Optionally, the fore pump is liquid rotary pump, and the liquid rotary pump and the cyclic water tank constitute circuit, the liquid rotary pump
Demister is equipped between the cyclic water tank.
Fig. 1~3 show a kind of more specifical tobacco humidifying machine pumped vacuum systems comprising main pipeline, bypass duct
And cooling water recirculation system, the main pipeline include the section in parallel positioned at pumping leading portion and the trunk section positioned at pumping back segment, institute
It states bypass duct to be in parallel with the section in parallel, the bypass duct is consistent with the pumping direction of the trunk section, the parallel connection
Section is equipped with the Roots vaccum pump that two-stage is serially connected, and the trunk section is equipped with liquid rotary pump, only has one on the bypass duct
A aspiration pump, i.e. steam jet pump are equipped with Pneumatic butterfly valve on the parallel connection section and bypass duct, and two Pneumatic butterfly valves are all provided with
Set the front end of all aspiration pumps in line segments where it；
The cooling water recirculation system includes cooler, condenser, circulating water cooling tower, cyclic water tank and recirculated water
Pump, in which:
Cooler is set to final stage Roots vaccum pump exhaust ports；
Condenser is set in trunk section, and between final stage Roots vaccum pump and liquid rotary pump；
The water outlet side of cyclic water tank and circulating water cooling tower composition loop, cyclic water tank and circulating water cooling tower is respectively provided with
One water circulating pump；
In addition, the circulating water cooling tower is also connected to provide cooling water for them with the cooler and condenser, institute
State the cooling water return water that cyclic water tank is also used to receive the cooler and condenser, the liquid rotary pump also with the cyclic water tank
Circuit is constituted, demister is equipped between the liquid rotary pump and the cyclic water tank.
Fig. 4 show existing vacuum conditioning three-level steam jet pump, wherein 1B, 2B, 3B are exactly concatenated steam injection
Pump, wherein 3B is first order steam jet pump, that is, the vacuum inlet feeds of system, is connected with vacuum conditioner true to provide
It is empty.1B is exactly can be with the steam jet pump of discharging directly into atmosphere.
The principle of above-mentioned three-level steam jet pump is that the working steam of steam jet pump certain pressure intensity leads to nozzle, decompression
Speedup (potential energy of steam is changed into kinetic energy) is mixed with spraying into mixing chamber with by pumping medium, carries out energy exchange, mixed gas
Body enters diffuser, and pressurization (kinetic energy is converted into pressure energy) of slowing down can configure condensation to reduce the pumping load of rear class pump
Device carries out heat exchange, reaches condensation high-temperature medium purpose by there is the two media convection current of certain temperature difference.
Above system not only takes up a large area, it is also necessary to which a large amount of steam and cooling water can generate big in process of production
The waste water of amount.In addition, steam consumed by above system inherently utilizes coal-burning boiler to obtain, and needs soft water, otherwise
Scale can be quickly formed in steam jet pump, and performance is caused to decline.
Unlike the prior art, the utility model constitutes pumping using Roots vaccum pump, steam jet pump and fore pump
Vacuum system.Wherein, it is equipped with 1 fore pump on main channel road (fore pump is either liquid rotary pump is also possible to other
Vacuum pump of type, such as dry vacuum pump, screw vacuum pump or roots blower etc., these selections are in the protection model of this patent
Within enclosing), since it is impossible to meet the needs of exhaust capacity for single forepump, 2 are further provided on main pipeline
Roots vaccum pump, for improving exhaust capacity and vacuum degree.
Roots vaccum pump is a kind of positive-displacement vacuum pump, is rotated using a pair of of rotor, volume changes to form vacuum.Due to
Without sealing fluids such as others liquid in chamber, it is consequently belonging to dry vacuum pump, compared to steam jet pump more environmental protection and section
Can, but Roots vaccum pump, if air inlet and exhaust outlet pressure difference are very big, can be produced in compressed gas when compression ratio is excessively high
The raw very big heat of compression is assembled in exhaust outlet, is caused very high temperature in cavity, is eventually led to vacuum pump failure, therefore Roots is true
Sky pump is not suitable for directly arranging atmosphere, needs to configure the liquid rotary pump of a smaller sucking rate in its exhaust outlet.
The vacuum of this system is broadly divided into two stages:
When first stage starts, the pressure of vacuum conditioning case is atmospheric pressure, prime pump operation, the holding of main line operated pneumatic valve
It closes, bypass operated pneumatic valve is opened, and steam jet pump is opened into steam valve, and steam jet pump brings into operation, tail portion steam
Into condenser, incoagulable gas is walked by fore pump suction again, forms vacuum capacity.Pressure in vacuum conditioning case is in shunt valve
It is quickly reduced under the collective effect of road steam jet pump and fore pump, after reaching specified vacuum degree, the Roots vacuum of main pipeline
Pump brings into operation, while the operated pneumatic valve of main pipeline is opened, and bypass operated pneumatic valve is closed, and steam jet pump is closed into steam valve
It closes, the pressure in vacuum conditioning case can achieve higher under the collective effect of main pipeline Roots vaccum pump and fore pump at this time
Vacuum degree.
In first stage, the gas of vacuum conditioner extraction is mainly air, powder and saturated vapor.
Into second stage, main pipeline operated pneumatic valve is closed, and Roots vaccum pump is also out of service, and bypass operated pneumatic valve is opened
Open, the steam valve of steam jet pump still remains turned-off, at this time steam jet pump be exactly a very little resistance channel (compared with
Small more of the resistance of two-stage Roots vaccum pump out of service, and be not in because the saturated vapor in process gas causes
The flow passage components such as gear box lubricating oil emulsification and the pump housing, rotor are corroded because of steam), vacuum state can be maintained.
Cooling water system in this system is then made of cyclic water tank, air-cooled water tower and two centrifugation delivery pumps.Circulation
Water tank is set near the vacuum pump set of this system, and air-cooled water tower is then arranged in outdoor, far from vacuum pump set and process units, is avoided
Its too high moisture generated is to the instrument of vacuum equipment, power control cabinet and nearby the tobacco leaf that stores damages.
Cyclic water tank can provide circulation fluid for prime liquid rotary pump, while can also collect the condensate return of condenser and cold
But the cooling backwater of device.The centrifugal pumps of cyclic water tank water outlet side can be transported to the circulation fluid for having certain heat outdoor
Air cooling tower cools down, and recirculated water after cooling then can be sent back to cyclic water tank by the centrifugal pumps of air cooling tower water outlet side,
Realize the thermostatic control of cyclic water tank.Meanwhile using the pressure head of centrifugal pumps, it is true cooling water can also to be conveyed to Roots
Sky pump and the cooling use of condenser, turn again in cyclic water tank after recycling, realize the utilization of self-loopa enclosed.In condenser
Condensate liquid then can be used for supplementing the regenerated loss of cold water of air cooling tower.
In the first stage, in order to improve the production efficiency, need to make to reach under original state specified vacuum level requirements institute
The shorter the time of consumption the better, therefore vacuum suction amount needs maximum at this time.If not setting bypass duct, Roots vaccum pump is only leaned on
It vacuumizes, even if be then equipped with frequency converter to Roots vaccum pump to realize that (plain edition Roots vaccum pump must reach pre-cooling
Operation could be started after to certain vacuum degree, otherwise because excessively high inlet pressure causes load excessive, cause motor mistake
Carry), but when vacuum degree is lower in the early stage, is also difficult to form effective exhaust capacity, therefore in actual moving process, it is time-consuming most
Long is exactly this period for reaching effective exhaust capacity of lobe pump from atmospheric pressure, be at this time fully rely on fore pump (such as
Liquid rotary pump or screw pump) exhaust capacity is provided.
Although the time of first stage can be shortened using the fore pump (liquid rotary pump or screw pump) of bigger exhaust capacity,
But the pump needs more powerful motor, and Roots vaccum pump is also required to be equipped with more powerful motor ability more effectively
The time is reduced, but when entering second stage maintenance vacuum, does not need so big exhaust capacity, then causes very big electricity
It can consumption.It can not effectively realize energy-efficient effect.
Therefore in order to reach energy-efficient effect and ensure vacuum degree and sucking rate takes into account demand.This system is in main pipeline
On increase a bypass duct, a steam jet pump is configured on the bypass duct.Using steam jet pump in the short time
(the redried leaf tobacco vacuum conditioning case of tobacco plant needs steam to get damp again tobacco leaf to the certain steam of interior consumption, therefore system pipes
Net has residue steam), the exhaust capacity of fore pump can be greatly improved.Compared to the mechanical pump process system of only main pipeline,
This system can choose the fore pump of more small machine power.(deserve vacuum when the vacuum degree of first stage is less than 20000Pa
When vacuum range of operation when degree reaches Roots vaccum pump effective exhaust capacity), bypass is closed, and steam jet pump is out of service,
Whole exhaust capacity is further increased using main pipeline lobe pump, vacuum conditioner can be made in the first phase with most in this way
The fast time reaches specified vacuum degree.
As it can be seen that being using the advantage that bypass is equipped with steam jet pump, using steam jet pump in the height for vacuumizing initial stage
Effect exhaust capacity and Roots vaccum pump are combined with each other in the high-efficiency air suction ability of high vacuum stage of Fig, may be implemented most efficiently to be evacuated
Combination, wherein steam jet pump only consumes factory's residue steam in a short period of time, compares original multistage steam jet pump
For technique, the consumption of steam is not only considerably reduced, and the residue steam of factory can be made full use of, realized energy-saving.
Meanwhile for other mechanical vacuum units, this system can be used more low power motor and reach higher efficiency,
Energy-saving effect is more obvious.
To second stage, needs to spray steam in vacuum conditioner and get damp again, only need to maintain vacuum at this time,
Too many exhaust capacity is not needed, and the gas that the stage comes from vacuum conditioner is all supersaturation water steam and some cigarettes
The problems such as oil is easy to cause to corrode to it when these gases pass through Roots vaccum pump, generates gear case oil emulsification, therefore sieve at this time
Thatch vacuum pump is out of service, closes main line, and uses bypass operation, and gas enters back into fore pump after steam jet ejector.
Steam jet pump does not need to be passed through steam yet at this time, is intended only as a channel.
For technique compared to the oil-sealed rotary pump of only main channel, this system has apparent energy-saving effect,
Second stage only needs a fore pump to run, and Roots vaccum pump and steam jet pump all can be out of service.Also, this system
Fore pump inherently belong to low power device, to realize more efficient energy conservation.Meanwhile the pumping of second stage can be to sieve
Thatch vacuum pump damages, in this regard, this system can protect Roots vaccum pump using bypass duct well again, makes whole system
It runs more safe and reliable.As it can be seen that the setting of this system bypass duct has the effect of achieving many things at one stroke.
In order to preferably utilize steam resource, this system is also equipped with a condensing recovery dress before the suction inlet of fore pump
It sets, gives the steam of steam jet pump and the supersaturated gas of second stage come condensing recovery by cooling water, these cleanings
The supplement of water consumption when soft water can be used for providing the operation of system, can further realize energy-saving and emission-reduction.
Further, in order to reduce the use of cooling water, the cooling water recirculation system in this system can be made one and close
Formula system, all cooling waters are provided by system itself, and the regeneration of cooling water is realized using air-cooled water tower and centrifugal pump, real
Show closed cycle function, the water resource being lost in cooling water regenerative process can then be obtained from production technology by condensate recycling device
It takes.
As it can be seen that this system is truly realized the recycling of resource, have the effect of energy-saving and emission-reduction, is to the prior art
A kind of significant improvement.
It is to be appreciated that be intended merely to facilitate this field common for the above-mentioned narration for this patent specific embodiment
Technical staff understands this patent scheme and the exemplary description enumerated, does not imply that the protection scope of this patent is limited solely to
In this few example, those of ordinary skill in the art completely can the art of this patent scheme is made fully understand under the premise of,
In the form of not paying any creative work, by taking combination technique feature, replacement to each example cited by this patent
More technical characteristics etc. mode is added in some technical characteristics, obtains more specific embodiments, all these specific implementations
Mode is within the covering scope of patent claims book, and therefore, these new specific embodiments also should be in this patent
Protection scope within.
In addition, this patent may also not enumerate some ordinary specific embodiments for the purpose for simplifying narration, this
A little schemes are that those of ordinary skill in the art can expect naturally after understanding the art of this patent scheme, it is clear that this
A little schemes should also be included within the protection scope of this patent.
For the purpose for simplifying narration, above-mentioned each specific embodiment may only up to for the extent of disclosure of technical detail
The degree that can voluntarily make a decision to those skilled in the art, that is, there is no disclosed technical detail for above-mentioned specific embodiment,
Those of ordinary skill in the art completely can be in the case where not paying any creative work, in filling for the art of this patent scheme
Divide under prompt, by means of textbook, reference book, paper, patent, audio-visual product etc., open source literature is completed, alternatively, this
A little details are the contents that can voluntarily make decision according to the actual situation under being generally understood of those of ordinary skill in the art.
As it can be seen that will not be impacted to the open adequacy of the art of this patent scheme even if these underground technical details.
The above embodiments are only used to help understand the utility model, keeps professional and technical personnel in the field real
Now or the utility model is used, is not intended to limit the utility model, within the spirit and principle of the utility model, is made
Any modification, equivalent substitution, improvement and etc., should be included within the scope of protection of this utility model.
Claims (6)
1. a kind of tobacco humidifying machine pumped vacuum systems, which is characterized in that including main pipeline, bypass duct and cooling water cyclic system
System, the main pipeline include positioned at the section in parallel of pumping leading portion and positioned at the trunk section for being evacuated back segment, the bypass duct and institute
It states section in parallel to be in parallel, the bypass duct is consistent with the pumping direction of the trunk section, and the parallel connection section is equipped with two-stage phase
Mutual concatenated Roots vaccum pump, the trunk section are equipped with fore pump, and the bypass duct is equipped with booster pump, the parallel connection section
With valve is equipped on bypass duct；
The cooling water recirculation system includes cooler, condenser, circulating water cooling tower, cyclic water tank and water circulating pump,
In:
Cooler is set to final stage Roots vaccum pump exhaust ports；
Condenser is set in trunk section, and between final stage Roots vaccum pump and fore pump；
The water outlet side of cyclic water tank and circulating water cooling tower composition loop, cyclic water tank and circulating water cooling tower is respectively provided with one
The water circulating pump；
In addition, the circulating water cooling tower is also connected to provide cooling water for them with the cooler and condenser, it is described to follow
Ring water tank is also used to receive the cooling water return water of the cooler and condenser.
2. tobacco humidifying machine pumped vacuum systems according to claim 1, which is characterized in that only have one on the bypass duct
A booster pump for pumping, and the booster pump is steam jet pump.
3. tobacco humidifying machine pumped vacuum systems according to claim 1, which is characterized in that the valve is pneumatic butterfly
Valve, the valve are arranged at the front end of all aspiration pumps in its place line segments.
4. tobacco humidifying machine pumped vacuum systems according to claim 1, which is characterized in that the condensed water of the condenser goes out
Mouth is connected to the cooling water recirculation system.
5. tobacco humidifying machine pumped vacuum systems according to claim 1, which is characterized in that the fore pump be liquid rotary pump or
Dry vacuum pump.
6. tobacco humidifying machine pumped vacuum systems according to claim 5, which is characterized in that the fore pump is liquid rotary pump,
The liquid rotary pump and the cyclic water tank constitute circuit, and demister is equipped between the liquid rotary pump and the cyclic water tank.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820743111.5U CN208192103U (en) | 2018-05-18 | 2018-05-18 | A kind of tobacco humidifying machine pumped vacuum systems |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820743111.5U CN208192103U (en) | 2018-05-18 | 2018-05-18 | A kind of tobacco humidifying machine pumped vacuum systems |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111285183A (en) * | 2018-12-10 | 2020-06-16 | 卓郎纺织解决方案两合股份有限公司 | Air extraction system |
| CN112120268A (en) * | 2020-09-28 | 2020-12-25 | 红塔烟草(集团)有限责任公司 | Vacuum pumping system of parallel vacuum damping machine |
-
2018
- 2018-05-18 CN CN201820743111.5U patent/CN208192103U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111285183A (en) * | 2018-12-10 | 2020-06-16 | 卓郎纺织解决方案两合股份有限公司 | Air extraction system |
| CN112120268A (en) * | 2020-09-28 | 2020-12-25 | 红塔烟草(集团)有限责任公司 | Vacuum pumping system of parallel vacuum damping machine |
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