CN208510060U - A kind of mechanical vacuum pumping system for redried leaf tobacco vacuum conditioning - Google Patents

Abstract

The utility model discloses a kind of mechanical vacuum pumping systems for redried leaf tobacco vacuum conditioning, belong to tobacco redrying technical field.It includes two vacuum conditioning casees, and the vacuum inlet feeds pipeline of every vacuum conditioning case is divided into main degassing pipeline and forevacuum/resurgence pipeline, a Shuttoff Valve is respectively housed on main degassing pipeline and forevacuum/resurgence pipeline after coming out；Two main degassing pipelines main Roots vaccum pump, intermediate Roots vaccum pump and main liquid rotary pump in sequential series after end crosses, the exhaust ports of main liquid rotary pump are connected with steam-water separator, and the lower section of steam-water separator is equipped with cyclic water tank；Two forevacuum/resurgence pipeline is connected with a backing vacuum pump after crossing, the exhaust outlet of backing vacuum pump is also connect with steam-water separator；Cyclic water tank is connected to main liquid rotary pump and backing vacuum pump respectively.The utility model can greatly improve energy-saving efficiency, reduce cost of investment and maintenance cost, and occupied area is small.

Description

A kind of mechanical vacuum pumping system for redried leaf tobacco vacuum conditioning

Technical field

The utility model relates to tobacco redrying technical fields, particularly relate to a kind of machinery for redried leaf tobacco vacuum conditioning Vacuum pump system.

Background technique

Lasioderma serricorne is worldwide storage damage by fume worm.During the links and cigarette of tobacco storage, it is subjected to lasioderma serricorne The harm of equal insects, brings great economic loss to cigarette enterprise.High temperature is very big to the Survival Effects of insect, in hot environment Middle insect performance is excited, go into a coma, enzyme system is destroyed, and partially protein solidification, insect is death after short time high temperature, even if It is moved into again in the environment of accommodating temperature to restore again.Therefore it is generally used vacuum conditioning both at home and abroad to handle redrying Tobacco leaf afterwards.Because under vacuum conditions pest parietal cells gap increase, be added hot steam after, steam can by body wall into Enter in pest body, kills off the insect pests.

For redried leaf tobacco using during vacuum conditioning, high-temperature disinsection heating not only may be implemented, while also achieving redrying The leaves moisting of tobacco leaf.It is easily broken generally in 5-8% because just cured tobacco leaf water content is very low again.In order to reduce the cigarette after redrying It loses, gets damp again caused by leaf is broken.So that junior tobacco leaf water tariff collection is in 16-17%.Using resurgence case vacuum After resurgence technology, can effectively control the water content of tobacco, tobacco leaf water content is too low to be easily broken, resurgence excessively, tobacco leaf can be because It darkens for moisture is excessively high, tarnish causes " flush ".

In present tobacco redrying resurgence technique, most vacuum conditioning techniques be first vacuum conditioner to tobacco leaf into Row vacuumizes, and commonly reaches 1000Pa or so, then carries out steam resurgence again, so that vacuum conditioner reaches 30000Pa, maintains The purpose of vacuum conditioning technique is realized after a period of time.

Most widely used vaccum-pumping equipment is steam jet pump pumped vacuum systems, traditional vacuum in current tobacco business Technique is that a set of vacuum conditioner is equipped with a set of vacuum equipment, which generally uses steam jet pump or mechanical vacuum Pump.Its processing step is mainly as follows:

It is 12min or so that damping machine, which runs a cycle, and tobacco leaf shelf (packed to be placed on a shelf) were placed on before this On mobile wooden handcart, the then whole cabinet for entering resurgence case, in place after, carry out shutdown sealing, these steps probably need 3min or so.

Later, vacuum conditioning cabinet starts to deaerate, and opens the valve of vacuum pipe, is pressed onto resurgence cabinet from an atmosphere 1000Pa generally requires time-consuming in 5min or so.After reaching technique vacuum level requirements, vacuum valve is closed, steam is opened and is returned Tide, i.e. vacuum degree return to 30000Pa or so, need to expend 2.5min at this time, carry out vacuum breaker to resurgence case, are restored to one big Under air pressure, resurgence chamber door is then opened, tobacco leaf shelf is placed on mobile wooden handcart and removes cabinet, complete the resurgence of a batch Technique.

As it can be seen that a production technology cycle time is 12min or so, about 5.5min is that front and back wooden handcart is mobile, handling Tobacco leaf shelf belong to the antivacuum period, and the main valve of vacuum pipe is to close.Due in vacuum pump set mechanical vacuum pump or Steam jet pump (its cooling water circulating pump) is unsuitable for frequent starting in a short time and (starts within average 5 minutes, run 7 points Clock stops again), so being to maintain continuous operation in use, and unlatching vacuum passage is closed with vacuum valve.Therefore for For the application of single vacuum conditioner, the utilization efficiency of vacuum pump only has 55-60%, and remaining is all the waste of energy consumption.

In short, the working efficiency of the single damping machine used in the prior art is relatively low, because in vacuum conditioning process category In period process, operators are in idle state, need to wait 8 points of kinds or so after loading and unloading tobacco leaf shelf.Together When, when there was a mechanical failure or other problems for unique damping machine, then entire job schedule will be stagnated.

Utility model content

In view of this, the utility model proposes a kind of mechanical vacuum pumping system for redried leaf tobacco vacuum conditioning, energy Energy-saving efficiency is enough greatly improved, reduces cost of investment and maintenance cost, and occupied area is small.

Based on above-mentioned purpose, technical solution provided by the utility model is:

A kind of mechanical vacuum pumping system for redried leaf tobacco vacuum conditioning comprising the vacuum conditioning of two arranged adjacents Case, the vacuum inlet feeds pipeline of every vacuum conditioning case are divided into main degassing pipeline and forevacuum/resurgence pipeline, main degassing after coming out One Shuttoff Valve is respectively housed on pipeline and forevacuum/resurgence pipeline；It is each to manage on main degassing pipeline and forevacuum degassing pipeline One is equipped between the Shuttoff Valve and vacuum conditioning case in road for detecting the vacuum pressure of vacuum conditioning case vacuum pressure value Power transmitter；Two main degassing pipelines main Roots vaccum pump, intermediate Roots vaccum pump and main liquid in sequential series after end crosses Ring pump, main Roots vaccum pump and intermediate Roots vaccum pump are equipped with variable-frequency motor；The exhaust ports of the main liquid rotary pump connect There is steam-water separator, the lower section of the steam-water separator is equipped with cyclic water tank；Two forevacuum/resurgence pipeline is connected with after crossing One backing vacuum pump, the exhaust outlet of the backing vacuum pump are also connect with the steam-water separator；The cyclic water tank difference It is connected to the main liquid rotary pump and backing vacuum pump, to provide replenisher for them.

Optionally, further include air cooling tower, the cyclic water tank by outlet pipeline and water return pipeline with it is described air-cooled tower-shaped At loop, a delivery pump is respectively provided on the outlet pipeline and water return pipeline.

Optionally, the cyclic water tank is also connected with water pipe, is equipped in the cyclic water tank for controlling water supply pipe The floating-ball level switch of road opening and closing.

From narration above as can be seen that the beneficial effect of technical solutions of the utility model is:

1, the utility model substitutes one in the prior art using two vacuum conditioning box bodies being adjacently positioned very Backlash tide box body, under same processing capacity, operator can share the volume of goods loaded and unloaded for needing to complete within original 4min 12min has been arrived, manipulation strength is significantly reduced, but has maintained the continuity of work, has avoided periodically assaulting operation, intermittence etc. It is reduced to caused attention, inefficiency, reduces security risk.

2, simple using 2 vacuum conditioning box bodies are adjacently positioned, if still a vacuum conditioning box body is equipped with one The utilization efficiency of a vacuum pump set, the then vacuum pump that single vacuum conditioner is equipped with only has 55-60%, then will result in pole The waste of the big energy, while the drawbacks such as that there is also investments is big, take up a large area, follow-up maintenance cost is big.For this purpose, this is practical new Type has redesigned the structure of whole system, takes the mode of binary machine interaction, it is no longer necessary to a set of vacuum equipment corresponding one Covering vacuum conditioning box body than existing traditional technology greatly improved energy-saving efficiency, reduce cost of investment and maintenance at This, while occupied area is small.

Detailed description of the invention

In order to clearly describe this patent, one or more attached drawing is provided below, these attached drawings are intended to this patent Background technique, technical principle and/or certain specific embodiments make aid illustration.It should be noted that these attached drawings can It some have been described and belongs to known in those of ordinary skill in the art often in this patent word segment to provide not providing The detail of knowledge；Also, because those skilled in the art can combine the published word content of this patent completely And/or accompanying drawing content, more attached drawings are designed in the case where not paying any creative work, therefore these attached drawings below All technical solutions that this patent word segment is described can be covered or not cover.In addition, these attached drawings is specific interior Contain and the word content in conjunction with this patent is needed to be determined, is tied when some in the word content and these attached drawings of this patent is obvious When structure is not consistent, needing the narration of common knowledge and this patent other parts in conjunction with this field to carry out comprehensive descision on earth is this There are exist to draw mistake in clerical mistake or attached drawing for the word segment of patent.Particularly, the following drawings is the figure of exemplary in nature Piece, it is not intended that imply the protection scope of this patent, those skilled in the art are by reference to text disclosed in this patent Word content and/or accompanying drawing content can design more attached drawings in the case where not paying any creative work, these are new Technical solution representated by attached drawing is still within the protection scope of this patent.

It is the pipeline structure schematic diagram of mechanical vacuum pumping system in the prior art shown in Fig. 1 and 2, Fig. 1 and Fig. 2 are respectively complete Left and right two parts of homogeneous tube line structure schematic diagram；

It is the pipeline structure schematic diagram of mechanical vacuum pumping system in the utility model embodiment, Fig. 3 and Fig. 4 shown in Fig. 3 and 4 Left and right two parts of respectively complete pipeline structure schematic diagram.

In figure: 01, single vacuum conditioning case, 02, inlet pneumatic butterfly valve, 03, pressure transmitter, 04, frequency converter (10~ 50Hz), 05, variable-frequency motor, 06, Roots vaccum pump, 07, temperature transmitter, 08, frequency converter (10~30Hz), 09, variable-frequency electric Machine, 010, Roots vaccum pump, 011, auxiliary bypass Pneumatic butterfly valve, 012, ordinary motor, 013, main liquid-ring vacuum pump, 014, common Motor, 015, auxiliary liquid-ring vacuum pump, 016, auxiliary liquid inlet pneumatic butterfly valve, 017, emptying, 018, steam-water separator, 019, follow Ring liquid inlet pneumatic ball valve, 020, fluid level transmitter, 021, cyclic water tank, 022, temperature transmitter, 023, moisturizing pneumatic ball valve, 024, fluid level transmitter, 025, the discharge of saturated with moisture body, 026, cooling tower, Box-A, vacuum conditioning case A, Box-B, vacuum are returned Damp case B, BF-3, vacuum conditioning case A take out Pneumatic butterfly valve, PT-A, pressure transmitter, PT-B, pressure transmitter, BF-1, vacuum in advance Get damp again case A inlet pneumatic butterfly valve, BF-2, vacuum conditioning case B inlet pneumatic butterfly valve, and BF-4, vacuum conditioning case B are evacuated dynamic butterfly in advance Valve, PP, forvacuum/resurgence subsidiary conduit, VSD-1, frequency converter (5~50Hz), VSD-2, frequency converter (5~50Hz), M-1, Variable-frequency motor, M-2, variable-frequency motor, VP-1, Roots vaccum pump, VP-2, Roots vaccum pump, VRD-1, soft activator are M-3, common Motor, VP-3, main liquid-ring vacuum pump, M-4, ordinary motor, VP-4, auxiliary forevacuum/resurgence liquid-ring vacuum pump, SF, carbonated drink point From device, WB, cyclic water tank, LT-2, fluid level transmitter, WS, the water pipe controlled by floating ball type switch valve, TT-1, temperature become Send device, CT, cooling tower.

The pump not marked in Fig. 1~4 is centrifugal pumps, and the valve not marked in Fig. 4 is circulation fluid check valve.

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.

As shown in Figures 3 and 4, a kind of mechanical vacuum pumping system for redried leaf tobacco vacuum conditioning comprising two are closed on The vacuum conditioning case of arrangement, the vacuum inlet feeds pipeline of every vacuum conditioning case be divided into after coming out main degassing pipeline and forevacuum/ Get damp again pipeline, and a Shuttoff Valve is respectively housed on main degassing pipeline and forevacuum/resurgence pipeline；In main degassing pipeline and pre- true On sky/resurgence pipeline, one is equipped between the Shuttoff Valve and vacuum conditioning case of each pipeline for detecting vacuum conditioning case The vacuum pressure transmitter of vacuum pressure value；Two main degassing pipelines after end crosses main Roots vaccum pump in sequential series, in Between Roots vaccum pump and main liquid rotary pump, main Roots vaccum pump and intermediate Roots vaccum pump are equipped with variable-frequency motor；The main liquid The exhaust ports of ring pump are connected with steam-water separator, and the lower section of the steam-water separator is equipped with cyclic water tank；Two forevacuum/return Damp pipeline is connected with a backing vacuum pump after crossing, the exhaust outlet of the backing vacuum pump also connects with the steam-water separator It connects；The cyclic water tank is connected to the main liquid rotary pump and backing vacuum pump respectively, to provide replenisher for them.

Specifically, two vacuum conditioning case A and B arranged adjacent, after the vacuum inlet feeds pipeline of every resurgence case comes out It is divided into main degassing pipeline and forevacuum/resurgence pipeline.One shut-off valve is respectively housed in main degassing pipeline and forevacuum/resurgence pipeline Door (according to the size of pipe diameter and technique requirement, various types of barrier valves, such as butterfly valve, gate valve can also be installed, every Film valve, ball valve etc., using electronic execution or pneumatic actuator).For any one vacuum conditioning case, main degassing pipeline One is kept to open forever with the Shuttoff Valve on forevacuum/resurgence pipeline, the state that another is closed, by Shuttoff Valve The operation being opened, closed each other of the signal that provides of limiter.When main degassing pipeline and forevacuum/resurgence pipeline pipeline When diameter is consistent, then 23 logical channel switchings can be realized using three-way ball valve.

Equipped with a vacuum between main degassing pipeline and forevacuum/resurgence pipeline Shuttoff Valve and vacuum conditioning case Pressure transmitter, for detecting the vacuum pressure value of vacuum conditioning case, the switching closing of valve does not influence the true of vacuum conditioning case Pneumatics power actual motion value.

It is required according to control, the pressure transmitter of two vacuum conditioning casees is corresponding with its in main degassing pipeline and pre- true There is sky/resurgence pipeline Shuttoff Valve automatic interlock control to require.

Vacuum conditioning case is corresponding in main degassing pipeline and forevacuum/resurgence pipeline shut-off valve under different phase Door function corresponding when opening and closing is as follows:

1, vacuum conditioning case is after closing cabinet, that is, when being in standby, opens main degassing pipeline Shuttoff Valve, close The Shuttoff Valve of forevacuum and resurgence pipeline belongs to quick degassing phase, and vacuum conditioning case enters operating status at this time；

2, vacuum conditioning case main degassing pipeline shut-off valve in standby mode closes door, the shutdown of forevacuum and resurgence pipeline Opening then belongs to forevacuum state；

3, vacuum conditioning case is in operating status, i.e., after vacuum degree reaches requirement, main degassing pipeline shut-off valve closes door, in advance Vacuum and the shutdown opening of resurgence pipeline then belong to resurgence state；

4, vacuum conditioning case (i.e. non-tight state) after opening cabinet, that is, when being in contents discharging, main deaeration pipe Road Shuttoff Valve is closed, and what the Shuttoff Valve of forevacuum and resurgence pipeline was opened belongs to pre-dehydration state (using tiny structure, pipe Remaining vapor condensate liquid suction is walked in road, resurgence cabinet).

It is then to be determined according to the setting value of its corresponding pressure transmitter, and control valve operates between 1-3,3-4.With On be that 4 states are run repeatedly according to the sequence period of 4-2-1-3 in total, when one when carrying out 1-3 state, another then into Row 4-2 operation.

Configured with 1 main Roots vaccum pump, 1 intermediate Roots vaccum pump and 1 main liquid rotary pump on main degassing pipeline, three Person is connected in series, and every Roots vaccum pump is equipped with variable-frequency motor, revolving speed adjustment is carried out using frequency converter, according to inlet pressure The value of feedback of transmitter and the current feedback values of frequency converter provide its running frequency of variable-frequency motor by calculating formula.In addition, pre- 1 backing vacuum pump is configured on vacuum/resurgence pipeline, which can be liquid rotary pump, be also possible to dry vacuum pump etc. Other types.The exhaust capacity of the characteristics of according to technique, the vacuum pump being equipped on forevacuum/resurgence pipeline are usually main deaeration pipe 8% or so of vacuum pump set on road, power of motor are 10%.

The exhaust outlet of liquid rotary pump of main degassing pipeline is connect with steam-water separator, which is then and cyclic water tank It is integral type, the steam water interface come out from pendular ring pump exhaust inlet is by steam-water separator progress gas-liquid separation, and gas is from vapour The top of separator is discharged in atmosphere, and liquid water then passes through gravity and enters in the water tank of lower part.The recirculated water passes through liquid outlet It is fed in liquid rotary pump again as replenisher, to realize closed cycle.Due to liquid rotary pump in pumping process to gas Compression generates a large amount of heat of compression and has passed to circulation fluid, therefore comes out from pendular ring pump exhaust inlet to steam-water separator separation Recirculated water into cyclic water tank has certain temperature rise, it is necessary to which needing to exchange heat removes the heat, otherwise accumulation of heat then water tank The temperature of interior circulation fluid can increase in a short time, and the raising of water temperature will greatly affect the efficiency of liquid rotary pump.Reduce pumping Ability reduces vacuum degree, and is easy to produce cavitation.

For this purpose, this example is additionally provided with an apopore in the bottom of water tank, and a centrifugal pumps are configured, so as to handle Liquid water with heat is delivered to outdoor air cooling tower, air cooling tower in the way of evaporative cooling, water that conveying is come into Row cooling obtains normal-temperature water, is then transmitted back to cyclic water tank by delivery pump again, ensures that the water temperature category in cyclic water tank In temperature constant state.

A floating-ball level switch, after liquid level reduces to home in water tank, Floating Ball Liquid Level are configured in cyclic water tank Switch can automatically open carry out moisturizing.

The working method of above system is as follows:

When vacuum conditioning case A starts degassing, the main degassing valve of the entrance of vacuum conditioning case A is opened at this time, and auxiliary is drawn back in advance Damp valve is to close.Vacuum conditioning case B staggers the time carry out handling tobacco leaf cargo after, wooden handcart enters cabinet, closes box sealing door. When this stage, vacuum conditioning case A starts degassing and enters the coda stage.Vacuum conditioning case B open auxiliary draw back in advance damp valve into Row is pre- to be taken out.

After vacuum conditioning case A terminates quickly to deaerate, main degassing valve is closed, and it is to open that auxiliary draws back damp valve in advance. Vacuum conditioning case B then immediately closes off auxiliary and draws back damp valve in advance, opens corresponding main degassing valve and is quickly deaerated.

After the vacuum conditioning case A short time gets damp again, immediately closes off auxiliary and draw back damp valve, and vacuum breaker in advance, wooden handcart is removed, opened Beginning carries out handling tobacco leaf cargo.Vacuum conditioning case B is just in degasification process at this time.

Equal vacuum conditionings case A handling goods, after closing hermatic door, vacuum conditioning case B just enters tail in degasification process at this time Sound, vacuum conditioning case A opening auxiliary are drawn back damp valve in advance and are taken out in advance.

Above-mentioned two vacuum conditioning case A and the periodic interactive operation of B, realize continuous production, it is ensured that vacuum pump Efficient utilization rate.Energy consumption is more saved compared to using two sets of vacuum pump sets.

Cooling water system is then made of cyclic water tank, air-cooled water tower and two centrifugation delivery pumps.Cyclic water tank is nearest In vacuum pump set, air-cooled water tower is then far from vacuum plant and process units, to avoid causing environment excessively high wet in outdoor Degree, causes the instrument, power control cabinet and the tobacco leaf nearby stored of vacuum equipment to damage.

Cyclic water tank can be the offer circulation fluid of liquid rotary pump to fore pump, while be also to collect condenser condensate return, Lobe pump cooling backwater etc..The circulation fluid for having certain heat is transported to outdoor according to the bottom centrifugal pumps of cyclic water tank Cooling Tower cools down, and recirculated water after cooling is being sent back to cyclic water tank again by the centrifugal pumps by air cooling tower, Realize the thermostatic control of cyclic water tank.Cooling water, is conveyed to Roots vaccum pump by the pressure head for utilizing centrifugal pumps simultaneously, is returned Receipts turn again in cyclic water tank.Realize the utilization of self-loopa enclosed.And the condensate liquid in condenser is then air-cooled for supplementing The regenerated loss of the cold water of tower.

In the prior art, the principle of steam jet pump is to lead to nozzle, decompressing speed-increasing (steam with the working steam of certain pressure intensity Potential energy be changed into kinetic energy) to spray into mixing chamber, mixed with by pumping medium, carry out energy exchange, mixed gas enters expansion Depressor, pressurization (kinetic energy is converted into pressure energy) of slowing down configure condenser, by having one to reduce the pumping load of rear class pump Determine the two media convection current of the temperature difference, carry out heat exchange, reaches condensation high-temperature medium purpose, be discharged to atmospheric pressure.Steam jet pump removes It takes up a large area, it is also necessary to which a large amount of steam and cooling water can generate a large amount of waste water in process of production.And it is consumed Steam inherently utilizes coal-burning boiler to obtain, and needs soft water, and scale otherwise can be quickly formed in steam jet pump, is caused Performance decline, and need to safeguard and repair.

And oil-sealed rotary pump mainly includes Roots vaccum pump, liquid rotary pump and screw vacuum pump, the principle of roots blower is all Volume changes to form vacuum, therefore only consumes electric energy in process of production.The circulation fluid of liquid rotary pump is that closed cycle utilizes, because This does not generate waste water.So compared to steam jet pump more energy conservation and environmental protection.

In addition, a set of vacuum pump set is applied to 2 vacuum conditioners in the utility model.Matched a set of vacuum pump set Mainly there are 1 main degassing liquid rotary pump and 1 auxiliary to draw back damp liquid rotary pump in advance, the big exhaust capacity of main degassing liquid rotary pump general satisfaction, Therefore installed power is relatively high, and assists 20% left side of the generally only main degassing liquid rotary pump of the exhaust capacity for drawing back damp liquid rotary pump in advance The right side, installed power also only have the 20% of main degassing liquid rotary pump.Main degassing liquid rotary pump and auxiliary draw back the pipeline of damp liquid rotary pump in advance is It is completely self-contained, it is connected on the main degassing mouth and resurgence mouth (the resurgence mouth can be used for deaerating) of damping machine, generally The diameter of main degassing mouth is 5 times or so of resurgence mouth diameter.

Main degassing liquid rotary pump and auxiliary draw back the main degassing mouth and resurgence mouth that damp liquid rotary pump is connected to each damping machine in advance It is all equipped with Pneumatic butterfly valve or other kinds of barrier valve, can be used for interactive handover operation.

Because liquid rotary pump can only achieve 4000Pa under circulation fluid room temperature, can not reach customer requirement 1000Pa or Lower vacuum degree, while not to be able to satisfy client big from one within the time of 5min or so for the exhaust capacity of single liquid rotary pump Air pressure reaches specified vacuum degree, therefore is equipped with one or more on the pipeline of main degassing liquid rotary pump according to the requirement of different process A Roots vaccum pump, effect are exactly to pass through step by step compression, and every level-one Roots vaccum pump can improve in the high vacuum stage The exhaust capacity and ultimate vacuum of previous stage, and finally meet vacuum degree and degassing time that client specifies.

It is defeated that one cyclic water tank, two centrifugations are equipped with to the circulation fluid that main degassing liquid rotary pump and auxiliary draw back damp liquid rotary pump in advance Pump and an air cooling tower is sent to constitute self cooling closed circulation system.Damp liquid rotary pump exhaust is drawn back in advance from main degassing liquid rotary pump and auxiliary After the gas-liquid mixture that mouth comes out carries out steam-water separation by the separated structure inside cyclic water tank, gas is discharged from upper tube.

It is divided into two chambers inside cyclic water tank and configures overflow balance channel in a high position, hot water and normal-temperature water is distributed in not In same region.Discharge liquor of the hot water from liquid rotary pump in cyclic water tank is delivered to outdoor air cooling tower by centrifugal pump, passes through Evaporative cooling regains normal-temperature water, then is pumped back in cyclic water tank in room temperature region by centrifugation conveying, and liquid level is passed through Difference conveys circulation fluid to two liquid rotary pumps.

It is upper in application, the degassing of two vacuum conditioners, resurgence time can be staggered, when a resurgence case completes dress Goods, wooden handcart inlet body after shutdown, are first taken out with a small-sized liquid rotary pump in advance.And another damping machine quickly takes off at this time The final stage of gas.This time difference is generally in 1min or so.

After the damping machine in quick degasification process reaches vacuum degree, the Pneumatic butterfly valve of the main vacuum passage of connection is closed It closes, draws back damp valve opening in advance, and be passed through steam and get damp again, and the pre- pumping valve of the damping machine of another pre- pumping closes at this time It closes, quickly degassing valve is opened, into quick degasification process.To realize interactive operation that the period switches repeatedly.

The resurgence case for waiting fast vacuum to deaerate take out in advance with a small-sized liquid rotary pump and is had very important significance.

Pendular ring pump power small-sized first is low, and sucking rate is also low, and the pre- pumping within the 1-2min time can reduce subsequent vacuum Unit is degassed for up to the time of vacuum level requirements.Improve the efficiency of production, and ought deaerate, the damping machine that gets damp needs prolong Long vacuum time (or because caused by the other reasons such as operation), then the resurgence case waited also slow degasification process in fact In.Second, it avoids working to two sets of vacuum conditioners using two sets of high-power vacuum systems, although two sets of damping machines can be same When produce, but efficiency, not only without improving 100%, but also in the waiting process of a cycle, liquid rotary pump is still being kept Operation, therefore operation energy consumption greatly improved.For in terms of other, cost of investment also greatly improved, in maintenance cost and Occupied area.

Third: taking out the damping machine of waiting using small liquid rotary pump in advance, substantially true in damping machine by 1-2min Reciprocal of duty cycle can achieve 70kpa, open vacuum main valve again at this time, and the impact of Roots-liquid-ring pump vacuum unit is just significantly subtracted It is small, the liquid rotary pump fluctuation of load is not only reduced, overload situations are avoided.It is also more conducive to lobe pump simultaneously in the traction of frequency converter It is lower to improve revolving speed faster, reduce degassing time.

In short, the utility model substitutes original Steam Ejector System using a set of mechanical vacuum pumping system, and simultaneously Vacuum requirement is provided for two sets of adjacent redried leaf tobacco vacuum conditioners.Due to taking the mode of binary machine interaction, no longer need It wants a set of vacuum equipment to correspond to a set of vacuum conditioner, than existing traditional technology, energy-saving efficiency greatly improved, reduce throwing Cost and maintenance cost are provided, while occupied area is small.

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.

In short, on the basis of combining explanation effect of the patent specification to claims protection scope, it is any Fall into the specific embodiment of patent claims book covering scope, within the protection domain of this patent..

Claims (3)

1. a kind of mechanical vacuum pumping system for redried leaf tobacco vacuum conditioning, which is characterized in that including two arranged adjacents Vacuum conditioning case, the vacuum inlet feeds pipeline of every vacuum conditioning case are divided into main degassing pipeline and forevacuum deaeration pipe after coming out A Shuttoff Valve is respectively housed on road, main degassing pipeline and forevacuum degassing pipeline；In main degassing pipeline and forevacuum deaeration pipe On road, one is equipped between the Shuttoff Valve and vacuum conditioning case of each pipeline for detecting vacuum conditioning case vacuum pressure value Vacuum pressure transmitter；Two main degassing pipelines main Roots vaccum pump in sequential series, intermediate Roots vacuum after end crosses Pump and main liquid rotary pump, main Roots vaccum pump and intermediate Roots vaccum pump are equipped with variable-frequency motor；The exhaust of the main liquid rotary pump Steam-water separator is connected at mouthful, the lower section of the steam-water separator is equipped with cyclic water tank；Two forevacuum/resurgence pipeline crosses After be connected with a backing vacuum pump, the exhaust outlet of the backing vacuum pump is also connect with the steam-water separator；The circulation Water tank is connected to the main liquid rotary pump and backing vacuum pump respectively, to provide replenisher for them.

2. the mechanical vacuum pumping system according to claim 1 for redried leaf tobacco vacuum conditioning, which is characterized in that also wrap Air cooling tower is included, the cyclic water tank forms loop, the outlet pipeline by outlet pipeline and water return pipeline and the air cooling tower With a delivery pump is respectively provided on water return pipeline.

3. the mechanical vacuum pumping system according to claim 1 for redried leaf tobacco vacuum conditioning, which is characterized in that described Cyclic water tank is also connected with water pipe, and the Floating Ball Liquid Level for controlling water pipe opening and closing is equipped in the cyclic water tank and is opened It closes.