CN216493445U

CN216493445U - Tobacco vacuum moisture regaining machine capable of directly taking cold type vacuum device

Info

Publication number: CN216493445U
Application number: CN202122921129.4U
Authority: CN
Inventors: 刘绍强; 鲁少平; 王月鹏; 崔辰浩
Original assignee: Zhengzhou Zhonghang Weier Technology Co ltd
Current assignee: Zhengzhou Zhonghang Weier Technology Co ltd
Priority date: 2021-11-26
Filing date: 2021-11-26
Publication date: 2022-05-13
Anticipated expiration: 2031-11-26

Abstract

The utility model provides a tobacco leaf vacuum moisture regaining machine of a direct cooling type vacuum device, which comprises a refrigerating unit and a condensing tower structure communicated with a moisture regaining box body through a first pipeline, wherein the upper end of the condensing tower structure is communicated with a filter, an evaporator of the refrigerating unit is installed in a heat exchange shell to form a steam catcher, the filter is communicated with the heat exchange shell of the steam catcher, the heat exchange shell of the steam catcher is connected with a roots pump and a second vacuum valve which are connected in parallel, outlets of the roots pump and the second vacuum valve are connected in parallel on the first vacuum valve, and the first vacuum valve is connected on a screw vacuum pump.

Description

Tobacco vacuum moisture regaining machine capable of directly taking cold type vacuum device

Technical Field

The utility model relates to the tobacco industry, in particular to a tobacco vacuum moisture regaining machine of a direct cooling type vacuum device.

Background

The tobacco vacuum moisture regaining machine is a main device in the tobacco processing process, and the working principle is as follows: placing tobacco leaves with the water content of about 12 percent in a vacuum box, evacuating to remove air in the tobacco leaves, and filling steam into the vacuum box after evacuating to a set vacuum degree, so that the tobacco leaves become moist and soft under the action of heat and mass transfer and are convenient for subsequent processing; depending on the process requirements, the evacuation and humidification process may last several times.

When the vacuum moisture regaining machine is in normal production, steam is charged into the vacuum box for many times, condensed water with the temperature of more than 50 ℃ is always stored in the vacuum box, when the vacuum moisture regaining machine is pumped to 16kPa, the condensed water starts to boil, and the evaporated steam inevitably becomes a newly added load of a vacuum unit; when the pressure is pumped to 0.9kPa, the volume of the water vapor is increased by about 14 ten thousand times compared with the original liquid volume, and the newly added load is undoubtedly huge; therefore, the condensed water in the box of the vacuum moisture regaining machine has great negative influence on the mechanical vacuum pump set, the air extraction time is prolonged, the overflowing parts of the mechanical vacuum pump are easily corroded by the water vapor, the emulsification probability of the lubricating oil is increased, and the maintenance cost is increased.

There is the patent to propose, clear away the ponding in the vacuum box with mechanical scraper blade, or compressed air jetting's mode, its shortcoming has three: (1) accumulated water is not thoroughly removed; (2) when the air is evacuated for the second time or the third time, accumulated water in the box cannot be removed; (3) the evaporation of the water vapor of the tobacco leaves is also pumped by the vacuum pump.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the utility model provides a tobacco leaf vacuum moisture regaining machine of a direct cooling type vacuum device, which effectively solves the technical problems that in the background technology, the accumulated water removing effect is poor during vacuumizing, the vacuumizing time is prolonged, water vapor easily causes corrosion to an overflowing part of a mechanical vacuum pump, the emulsifying probability of lubricating oil is increased, and the maintenance cost is increased.

The technical solution of the utility model is as follows: the tobacco leaf vacuum moisture regaining machine comprises a refrigerating unit and a condensing tower structure communicated with a moisture regaining box body through a first pipeline, wherein a filter is communicated with the upper end of the condensing tower structure, an evaporator of the refrigerating unit is installed in a heat exchange shell to form a steam catcher, the filter is communicated with the heat exchange shell of the steam catcher, the heat exchange shell of the steam catcher is connected with a roots pump and a second vacuum valve which are connected in parallel, outlets of the roots pump and the second vacuum valve are connected in parallel on the first vacuum valve, and the first vacuum valve is connected to a screw vacuum pump.

Preferably, the lower part of the heat exchange shell of the steam catcher is communicated with a liquid storage tank through a first vacuum stop valve, and the side wall and the lower end of the liquid storage tank are respectively communicated with a second vacuum stop valve and a third vacuum stop valve.

Preferably, the refrigerating unit comprises a compressor, the compressor is connected with a separator, the separator is connected with a condenser, the condenser is connected with a dryer, the dryer is connected to an inlet of the evaporator through a thermal expansion valve, and an outlet of the evaporator is connected to the compressor.

Preferably, the condensing tower structure includes the condensing tower casing, the moisture regain box is connected on the condensing tower casing through first pipe connection, is equipped with the third vacuum valve on the first pipeline, condensing tower casing lower extreme is connected with vacuum water tank through the fourth vacuum valve, vacuum water tank is connected with the second circulating pump through first check valve, the second circulating pump is connected with the second check valve through the sixth vacuum stop valve, and the second check valve is connected with the return water pipeline, the return water pipeline passes through the cooling tower intercommunication in circulation tank, circulation tank lower extreme intercommunication has the seventh vacuum stop valve, the lower part of circulation tank lateral wall is connected at the spray set of condensing tower casing lateral wall internal fixation through working shaft, third check valve, fifth vacuum valve intercommunication.

Preferably, a demister is arranged in a condensation tower shell at the upper part of the spraying device.

The utility model has the beneficial effects that:

1. when the vacuum pump carries out the evacuation, the moisture that will take out in the box from the conditioning is earlier through condensing tower with most moisture condensation water, keeps in the vacuum water tank, and the moisture in the vapor that is not condensed process defroster, filter, catch vapour ware and with the air is got rid of, then discharges in getting into the vacuum pump. At the moment, because the moisture in the air is removed, the load of the vacuum pump is greatly reduced, and the normal operation of the vacuum pump is ensured.

2. The evaporator in the refrigerating unit is used as a steam catcher, so that moisture entering the steam catcher is condensed and discharged.

3. Moisture in the gas is removed through the condensation tower, the demister and the steam trap, so that the drying degree of the air is greatly ensured, and the normal operation of the vacuum pump is ensured.

4. The gas with the water vapor passes through the filter, so that solid matters in the gas are filtered, and the normal operation and the service life of equipment such as a vacuum pump and the like are further ensured.

Description of the drawings:

FIG. 1 is a schematic structural diagram of the present invention.

Description of reference numerals: the device comprises a first pipeline 1, a moisture regain box body 2, a filter 3, an evaporator 4, a heat exchange shell 5, a steam trap 6, a roots pump 7, a second vacuum valve 8, a first vacuum valve 9, a screw vacuum pump 10, a first vacuum stop valve 11, a liquid storage tank 12, a second vacuum stop valve 13, a third vacuum stop valve 14, a compressor 15, a separator 16, a condenser 17, a dryer 18, a thermal expansion valve 19, a condensing tower shell 20, a third vacuum valve 21, a fourth vacuum valve 22, a vacuum water tank 23, a first one-way valve 24, a second circulating pump 25, a sixth vacuum stop valve 26, a second one-way valve 27, a water return pipeline 28, a cooling tower 29, a circulating water tank 30, a seventh vacuum stop valve 31, a water supply pump 32, a third one-way valve 33, a fifth vacuum valve 34 and a demister 35.

Detailed Description

The utility model is further explained with the attached drawings.

In the utility model, the condensing tower structure is that the lower part of a condensing tower shell 20 is connected to a vacuum water tank 23 through a third vacuum valve 21, the lower part of the vacuum water tank 23 is connected to a second circulating pump 25 through a first one-way valve 24, when a vacuum pump vacuumizes a moisture regain box 2, the effect of the first one-way valve 24 can ensure that the vacuum in the box is not broken, the second circulating pump 25 is not opened during vacuumization, condensed water flowing out from the lower part of the condensing tower shell 20 flows into the vacuum water tank 23, when vacuumization is stopped, the second circulating pump 25 is opened, the first one-way valve 24 is opened under the effect of water pressure, water in the vacuum water tank 23 is pumped into a circulating water tank 30 through a water return pipeline 28 by the second circulating pump 25, the water return pipeline 28 is cooled through a cooling tower 29 before entering the circulating water tank 30, the circulating water tank 30 is ensured to be cooling water, and during vacuumization, the water supply pump 32 is started, so that cooling water in the circulating water tank 30 is sprayed out through the spraying device on the upper portion of the condensing tower, the spraying device cools steam entering from the moisture regaining box body 2, steam in the steam is condensed into water drops, then the residual gas is demisted through the demister 35, solid impurities in the residual gas are filtered through the filter 3, the steam in the residual gas is further condensed through the steam catcher 6, moisture in the steam is further removed, and the residual gas is discharged through the vacuum pump.

The steam trap 6 is equivalent to a tubular heat exchanger, and the evaporator 4 of the refrigeration unit is placed in the heat exchange shell 5 to form the steam trap 6, so that the steam entering the heat exchange shell 5 is cooled, and the evaporator 4 in the steam trap 6 is used for refrigerating the space in the heat exchange shell 5, so that the moisture in the gas passing through the steam trap shell is cooled. In the process of vacuumizing, the first vacuum valve 9 on the upper part of the liquid storage tank 12 is stopped and opened, the second vacuum stop valve 14 and the third vacuum stop valve 14 are closed, the vacuum state is kept at the moment, condensed water in the heat exchange shell 5 flows into the liquid storage tank 12, when water needs to be drained, the first vacuum stop valve 11 on the upper part is closed, the vacuum degree on the upper part of the first vacuum stop valve 11 is ensured, the second vacuum stop valve 13 on the side end and the third vacuum stop valve 14 on the lower end are opened, the second vacuum stop valve 13 on the side end aims to break the air and enter the air, and the condensed water is favorably drained smoothly from the third vacuum stop valve 14 below. The separator 16 is an oil separator 16.

The first vacuum valve 9 connected between the roots pump 7 and the screw vacuum pump 10 has the function that the vacuum pump is closed after vacuum pumping is finished, so that the vacuum degree in a loop can be kept, energy conservation is facilitated, the vacuum valve can be removed, and the vacuum in the loop can be obtained by performing vacuum in the screw vacuum pump 10. And the outlet of the roots pump 7 is connected with a second vacuum valve 8 in parallel, which can short-circuit the roots pump 7 and directly use the screw vacuum pump 10 to vacuumize the system loop.

When the utility model is used, the moisture regaining box body 2 is firstly vacuumized to 8kpa by the screw vacuum pump 10 (at the moment, the second vacuum valve 8 is opened, and the roots pump 7 is in short circuit), then the second vacuum valve 8 is closed, the roots pump 7 is opened, and the vacuum degree is vacuumized to reach the working vacuum degree, for example, the working vacuum degree can be 400-.

When the system is vacuumized for the first time, the vacuumizing action and sequence are used, air and accumulated condensed water are contained in the moisture regaining box body 2, and the air is exhausted through the vacuum valve, the condensing tower, the demister 35, the filter 3, the steam trap 6 and the vacuum pump during vacuumizing. In the later stage of vacuum pumping, a large amount of condensed water in the box body is gasified, and low-temperature and low-pressure water vapor is condensed into condensed water in the steam catcher 6, so that the load of the vacuum pump is reduced. The cold water circulating system of the condensation tower is not opened for the first time.

After the first vacuumizing, steam is sprayed into the moisture regain box body 2, tobacco leaves are moisturized, secondary vacuumizing is conducted after moisturizing is finished, because a large amount of water vapor exists in the moisture regain box body 2, a cold water circulating system is started firstly, the water vapor is condensed into water in the cooling tower 29 after coming out of the box body and is stored in the vacuum water tank 23 temporarily, the water vapor which is not condensed passes through the demister 35, the filter 3 and the steam catcher 6 and is then discharged through the second vacuum valve 8 and the screw vacuum pump 10, at the moment, as the tobacco leaves are humidified, the roots vacuum pump is not started again in secondary vacuumizing, and otherwise, the moisture of the tobacco leaves can be evaporated under high vacuum. The wet air can be humidified for the second time and is reversely pumped according to the requirement.

When the tobacco leaves are finally exhausted, the reverse pumping is needed, the reverse pumping has the function of pumping off the excessive exhaust steam in the box body, the temperature of the tobacco leaves can be adjusted secondly, the temperature balance is ensured, then the tobacco leaves are broken empty, and the tobacco leaves are output.

The utility model adopts the condensation and vacuum composite technology, and the low-temperature and low-pressure water vapor generated in the evacuation process is condensed into liquid by the vapor catcher 6, thereby reducing the working load of the vacuum pump, reducing the installed power of the vacuum system, protecting the mechanical vacuum pump set from being corroded by the vapor, and shortening the evacuation time; compared with the traditional equipment, the method achieves the same technological parameters, can obviously reduce the installed power or save the working time, and achieves the purposes of saving energy consumption and improving the running reliability of the equipment.

The steam with the temperature lower than 33 ℃ is changed into low-temperature steam, and the steam with the temperature of 32-100 ℃ is called medium-temperature steam.

Claims

1. The tobacco vacuum moisture regaining machine comprises a refrigerating unit and a condensing tower structure communicated with a moisture regaining box body (2) through a first pipeline (1), wherein the upper end of the condensing tower structure is communicated with a filter (3), an evaporator (4) of the refrigerating unit is installed in a heat exchange shell (5) to form a steam catcher (6), the filter (3) is communicated with the heat exchange shell (5) of the steam catcher (6), the heat exchange shell (5) of the steam catcher (6) is connected with a roots pump (7) and a second vacuum valve (8) which are connected in parallel, outlets of the roots pump (7) and the second vacuum valve (8) are connected in parallel on the first vacuum valve (9), and the first vacuum valve (9) is connected on a screw vacuum pump (10).

2. The tobacco vacuum moisture regaining machine of the direct cold-taking vacuum device as claimed in claim 1, characterized in that the lower part of the heat exchange shell (5) of the steam catcher (6) is connected with a liquid storage tank (12) through a first vacuum stop valve (11), and the side wall and the lower end of the liquid storage tank (12) are respectively connected with a second vacuum stop valve (13) and a third vacuum stop valve (14).

3. The tobacco vacuum moisture regaining machine of the direct cooling vacuum device as claimed in claim 1, characterized in that the refrigerating unit includes a compressor (15), the compressor (15) is connected with a separator (16), the separator (16) is connected with a condenser (17), the condenser (17) is connected with a dryer (18), the dryer (18) is connected with the inlet of the evaporator (4) through a thermal expansion valve (19), and the outlet of the evaporator (4) is connected with the compressor (15).

4. The tobacco vacuum moisture regaining machine of the direct cooling vacuum device according to claim 1, wherein the condensing tower structure comprises a condensing tower shell (20), the moisture regaining box (2) is connected to the condensing tower shell (20) through a first pipeline (1), a third vacuum valve (21) is arranged on the first pipeline (1), the lower end of the condensing tower shell (20) is connected with a vacuum water tank (23) through a fourth vacuum valve (22), the vacuum water tank (23) is connected with a second circulating pump (25) through a first one-way valve (24), the second circulating pump (25) is connected with a second one-way valve (27) through a sixth vacuum stop valve (26), the second one-way valve (27) is connected with a water return pipeline (28), the water return pipeline (28) is communicated in a circulating water tank (30) through a cooling tower (29), and the lower end of the circulating water tank (30) is communicated with a seventh vacuum stop valve (31), the lower part of the side wall of the circulating water tank (30) is communicated with a spraying device fixed in the upper part of the side wall of the condensing tower shell (20) through a water supply pump (32), a third one-way valve (33) and a fifth vacuum valve (34).

5. The tobacco vacuum moisture regaining machine of the direct cooling vacuum device as claimed in claim 4, wherein the condenser shell (20) of the upper part of the spraying device is equipped with a demister (35).