CN107136551B - A kind of enclosed hydrofuge and the hot air combined heat pump tobacco leaf drying room used of open type - Google Patents

Abstract

The invention discloses a heat pump tobacco leaf drying room combined with closed-type dehumidification and open-type hot air, which comprises a drying room and a heat control room. , Separate heat pipe heat exchanger, the heat pump includes a compressor, condenser, and evaporator; the separate heat pipe heat exchanger includes a heat pipe condensation section and a heat pipe evaporation section, and the condenser and the heat pipe condensation section are arranged side by side in the heating unit to separate the heating unit It is the first air inlet chamber and the first air outlet chamber. The bottom end of the condenser and the bottom end of the heat pipe condensation section are provided with a condensate collector. The unit is divided into the second air inlet chamber and the second air outlet chamber. The first air inlet, the second air outlet chamber, and the drying chamber are controlled by valves. The switch between open and closed is realized in the structure to meet the needs of tobacco leaf drying. The requirements of each stage provide the quality of the dried product.

Description

A heat pump tobacco leaf drying room combined with closed dehumidification and open hot air

technical field

The invention relates to the technical field of tobacco leaf drying equipment, in particular to a heat pump tobacco leaf drying room which is combined with closed type dehumidification and open type hot air.

Background technique

At present, the heat pump drying tobacco leaves all adopt the open mode of operation. The so-called open mode of the heat pump is compared with the closed mode of the heat pump. Simply put, the open mode is like the heating mode of the household split air conditioner. The outdoor unit, the drying room is like the indoor unit, which circulates and heats the objects to be dried, and the main machine outside the drying room is a compressor and an evaporator, which are used to absorb the heat of the outdoor air. Closed dehumidification drying and open hot air drying are two heat pump equipment with completely different principles. The two methods have their own advantages and disadvantages. The products processed by closed drying and drying have small deformation, positive color and strong fragrance. , the closed drying operation cost is low, the disadvantage of the closed drying drying is: in the later stage of the drying process, after the drying temperature exceeds 50 ° C, the humidity in the drying room is small at this time, and the closed drying Both the dry heat pump evaporator and the separated heat pipe evaporator are cooling. If the humidity is low, not much water can be condensed. The cooling affects the drying heating temperature. At this time, the efficiency is lower than that of the open type. At present, the vast majority of domestic heat pump dryers use open-type hot air drying. Compared with closed-type dehumidification drying, open-type hot-air drying has the advantage of high drying efficiency in the later stage of drying, but the products after drying are deformed and discolored. If it is not correct, the fragrance will lose a lot. It is difficult to achieve the ideal drying effect by using a single drying method.

Contents of the invention

Aiming at the above problems, the present invention overcomes their shortcomings and provides a heat pump tobacco leaf drying room that combines the advantages of open and closed drying.

In order to achieve the above purpose, the following technical solutions are adopted:

A heat pump tobacco leaf drying room combined with closed dehumidification and open hot air, including a drying room and a heat control room, the heat control room includes a heating unit, a dehumidification and heat recovery unit, and a heat pump, a separate heat pipe heat exchanger, the heat pump includes a compressor, a condenser, and an evaporator; the separated heat pipe heat exchanger includes a heat pipe condensation section and a heat pipe evaporation section, and the condenser and the heat pipe condensation section are arranged in parallel In the unit, the heating unit is divided into a first air inlet chamber and a first air outlet chamber. The bottom end of the condenser and the bottom end of the condensation section of the heat pipe are provided with a condensed water collector, and the first air inlet chamber is provided with A first air inlet and a second air inlet, the first air inlet is provided with a first air valve, the second air inlet is provided with a second air valve, and the first air outlet chamber is provided with a first air valve. The air outlet, the evaporator and the evaporation section of the heat pipe are arranged side by side in the dehumidification and heat recovery unit to divide the dehumidification and heat recovery unit into a second air inlet chamber and a second air outlet chamber, and the second air inlet chamber A third air inlet and a fresh air inlet are provided, a third air valve is provided on the third air inlet, a fourth air valve is provided on the fresh air inlet, and a second air outlet is provided on the second air outlet chamber and an air exhaust port, the air exhaust port is provided with an evaporator fan and a fifth air valve, the drying chamber is provided with an air supply port and an air return port, and the air supply port is provided with a circulation fan and is connected with the first air outlet The second air inlet and the third air inlet are connected to the return air outlet, the first air inlet is connected to the second air outlet, and the fresh air inlet and the exhaust outlet are connected to the external environment. connected.

Further, it also includes a controller, the first air valve, the second air valve, the third air valve, the fourth air valve, and the fifth air valve are all electric air valves and are connected to the controller for control, so The evaporator fan and the circulation fan are connected to the controller for control.

Further, the top of the drying chamber is provided with an orifice-type air duct, which communicates with the air supply port. The orifice-type air duct is a flat plate with a cavity, and the bottom surface of the orifice-type air duct is evenly distributed There are multiple air outlets.

Further, a cigarette rack is provided in the drying chamber, the cigarette rack includes a horizontal frame and a support frame, the support frame is connected with the bottom and the top of the drying chamber, and a cigarette clip hanger is provided on the horizontal frame .

Further, the heat control chamber is divided into three units arranged in sequence from top to bottom, the heating unit is located in the upper part, the dehumidification and heat recovery unit is located in the middle part, the compressor is arranged in the lower unit, and the lower unit There is an inspection window on the outer wall.

Further, the heating unit is separated from the dehumidification and heat recovery unit by a partition, the first air inlet is arranged at the bottom of the heating unit, and the second air outlet is correspondingly arranged at the bottom of the dehumidification and heat recovery unit. top.

Further, the heat control room is arranged at one end of the drying room, the other end of the drying room is provided with a door, and a switch is provided on the door, and the two sides of the drying room and the door are There is also a viewing window.

This equipment combines the advantages of open and closed drying, overcomes their shortcomings, and achieves the switch between open and closed by controlling the switch of the valve. During the whole drying process, the air in the drying room is never in contact with the outside air, the aroma of tobacco in the drying room does not flow out, and the aroma of the tobacco leaves is condensed in the dry tobacco leaves to the maximum extent, and the color of the tobacco leaves after drying , aroma and appearance will be higher than the tobacco leaves produced by the existing common heat pump drying room. In a complete drying process, when to use the open hot air mode and when to use the closed dehumidification drying mode, it is controlled by the controller, and the electric air valves of each part are automatically opened or closed according to the temperature and humidity sensor and the input program. And fan, automatic switching open or closed mode.

Description of drawings

Fig. 1 is a schematic structural view of the present invention when it is in an open mode;

Fig. 2 is a schematic structural view of the present invention when it is in a closed mode;

Fig. 3 is a sectional view at A-A in Fig. 1 and Fig. 2;

Fig. 4 is a sectional view at B-B in Fig. 1 and Fig. 2;

Fig. 5 is the left view of Fig. 1;

Fig. 6 is a right side view of Fig. 1 .

Detailed ways

Below in conjunction with accompanying drawing, the present invention is described in further detail:

As shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, and Fig. 6, the equipment is a heat pump tobacco leaf drying room combined with closed type dehumidification and open type hot air, including drying room 1, control Heat chamber 2, the heat control chamber 2 includes a heating unit 21, a dehumidification heat recovery unit 22, a heat pump and a separate heat pipe heat exchanger are arranged in the heat control chamber 2, and the heat pump includes a compressor 31, a condenser 32, an evaporation The separate heat pipe heat exchanger includes a heat pipe condensation section 41 and a heat pipe evaporation section 42, and the condenser 32 and the heat pipe condensation section 41 are arranged side by side in the heating unit 21 to separate the heating unit 21 into a first stage The air chamber 211 and the first air outlet chamber 212, the bottom end of the condenser 32 and the bottom end of the heat pipe condensation section 41 are provided with a condensed water collector 9, and the first air inlet chamber 211 is provided with a first air inlet 51 and the second air inlet 52, the first air inlet 51 is provided with a first air valve 71, the second air inlet 52 is provided with a second air valve 72, and the first air outlet cavity 212 is provided with There is a first air outlet 61, the evaporator 33 and the heat pipe evaporating section 42 are arranged side by side in the dehumidification and heat recovery unit 22, and the dehumidification and heat recovery unit 22 is divided into a second air inlet chamber 221 and a second air outlet chamber 222, the second air inlet cavity 221 is provided with a third air inlet 53 and a fresh air inlet 54, the third air inlet 53 is provided with a third damper 73, and the fresh air inlet 54 is provided with a fourth air inlet valve 74, the second air outlet chamber 222 is provided with a second air outlet 62 and an air outlet 63, and the air outlet 63 is provided with an evaporator fan 82 and a fifth air valve 75, and the drying chamber 1 is provided with an air supply port 11 and an air return port 12, the air supply port 11 is provided with a circulating fan 81 and communicates with the first air outlet 61, and the second air inlet 52 and the third air inlet 53 are connected to the return air port 12, the first air inlet 51 communicates with the second air outlet 62, and the fresh air inlet 54 and the air outlet 63 communicate with the external environment.

It also includes a controller, the first air valve 71, the second air valve 72, the third air valve 73, the fourth air valve 74, and the fifth air valve 75 are all electric air valves and are connected to the controller , the fan of the evaporator 33 and the circulating fan 81 are connected to the controller for control.

The top of the drying chamber 1 is provided with an orifice air duct 13, and the orifice air duct 13 is a galvanized iron sheet orifice air duct. The orifice air channel 13 is in communication with the air outlet 11 , and the orifice air channel 13 is a flat plate with a cavity, and a plurality of air outlet holes 131 are uniformly distributed on the bottom surface thereof.

The drying chamber 1 is provided with a cigarette rack 14, the cigarette rack 14 includes a horizontal frame 141 and a support frame 142, the support frame 142 is connected with the bottom and the top of the drying chamber 1, and the horizontal frame 141 A cigarette clip hanger 143 is provided.

The heat control chamber 2 is divided into three units arranged in sequence from top to bottom, the heating unit 21 is located in the upper part, the dehumidification heat recovery unit 22 is located in the middle part, the compressor 31 is arranged in the lower unit, and the lower part An inspection window 231 is provided on the outer wall of the unit.

The heating unit 21 is separated from the dehumidification and recuperation unit 22 by a partition, the first air inlet 51 is arranged at the bottom of the heating unit 21, and the second air outlet 62 is correspondingly arranged at the dehumidification and recuperation unit. Top of Unit 22.

The heat control chamber 2 is arranged at one end of the drying chamber 1, and the other end of the drying chamber 1 is provided with a door 15, and the door 15 is provided with a switch. The two sides of the drying chamber 1 and Also be provided with observation window 16 on the door 15.

According to the basic procedure of tobacco leaf curing, at the beginning of tobacco leaf curing, which is the first stage of tobacco leaf turning yellow, the temperature is maintained at 36°C--38°C without dehumidification. That is, the freshly picked tobacco leaves are steamed in the drying room with damp heat to make the tobacco leaves soft and yellow. This stage generally lasts for about 48 hours. The operation adopts the open hot air mode. As shown in FIG. 1 , at this moment, the first air valve 71 is opened, the second air valve 72 is closed, and the third air valve 73 is closed. The hot air circulation process in the drying room is as follows:

Hot air --- circulating fan 81 --- air supply port 11 --- orifice air duct 13 --- heating the dried items --- return air port 12 --- first air inlet 51 --- heat pipe condensation section 41 ---Heat pump condenser 32 ---Circulation fan 81.

In the open hot air mode, the evaporator 33 of the heat pump is open to the ambient air. It is responsible for absorbing the heat in the outdoor air and releasing it into the drying room through the condenser 32, and its heat absorption process is:

Outdoor fresh air --- fourth air valve 74 --- heat pipe evaporation section 42 --- heat pump evaporator 33 --- evaporator fan 82 --- discharge cold fresh air.

During the operation of the open hot air mode at this stage, the air in the drying room is not in contact with the outside air, that is, there is no moisture exhausted from the drying room, and no outdoor fresh air enters. While the heat pump evaporator 33 is in contact with the outside air during work, after the outside fresh air passes through the evaporator 33 and is extracted heat, it is then discharged into the outside atmosphere.

The second stage of tobacco leaf curing is the color-fixing stage of tobacco leaves. This stage requires a lot of dehumidification, and the temperature is controlled at 39°C---42°C for 30 hours. At this stage, the closed drying mode is used. As shown in Figure 2, the evaporator fan 82 is closed, the fourth air valve 74 is closed, and the fifth air valve 75 is closed. The flow sequence of the hot drying air in the drying room is as follows:

Heated dry hot air --- Circulating fan 81 --- Orifice air duct 13 --- Heating the items to be dried --- Items discharge the hot air after humidification --- Return air outlet 12 --- Third air inlet 53 ---heat pipe evaporation section 42, condensed water discharge---heat pump evaporator 33, condensed water discharge---relatively cold dry air after dehumidification---heat pipe condensing section 41---heat pump condenser 32--- Heated by hot dry air.

In this stage of operation, the closed dehumidification and drying mode is adopted, the air in the drying room does not contact the outside atmosphere, and the dehumidification depends on the condensation of the heat pump evaporator 33 and the evaporating section 42 of the separated heat pipe in the cooling state, so that the heated The moisture discharged in the article body, the condensed water is discharged to the outside of the drying room through the condensed water collector 9. Unlike other types of heat pump dryers, the hot and humid air outside the drying room is exhausted.

The third stage of tobacco leaf curing is the drying stage of tobacco leaves. This stage requires a small amount of dehumidification, the temperature is controlled at 43°C-68°C, and the duration is about 36 hours. At this stage, the closed drying mode and the open mode are combined to operate in different time periods. During the period of 43 ° C --- 55 ° C, the open and closed modes are operated alternately in time periods, and at 56 ° C --- 68 ° During C, use the open hot air mode until the end of drying.

In a complete drying process, when to use the open hot air mode and when to use the closed dehumidification drying mode is automatically controlled by the controller. According to the temperature and humidity sensor and the input program, the electric fan in each part is automatically turned on or off. Valves and fans, automatic switching between open and closed modes.

This equipment combines the advantages of open and closed drying, overcomes their shortcomings, and achieves the switch between open and closed by controlling the switch of the valve. During the whole drying process, the air in the drying room is never in contact with the outside air, the aroma of tobacco in the drying room does not flow out, and the aroma of the tobacco leaves is condensed in the dry tobacco leaves to the maximum extent, and the color of the tobacco leaves after drying , aroma and appearance will be several grades higher than the tobacco leaves produced by the existing ordinary heat pump drying room.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: the present invention can still be Modifications to the specific implementation of the invention or equivalent replacement of some technical features; without departing from the spirit of the technical solution of the present invention, should be included in the scope of the technical solution claimed in the present invention.

Claims (7)

1. a kind of enclosed hydrofuge and the hot air combined heat pump tobacco leaf drying room used of open type, including drying room, control hot cell, feature It is：The control hot cell includes heating unit, dehumidifying backheat unit, controls and is equipped with heat pump, separate type heat pipe exchanger, institute in hot cell It includes compressor, condenser, evaporator to state heat pump；The separate type heat pipe exchanger includes heat pipe condenser section and heat pipe evaporation Section, the condenser and heat pipe condenser section be disposed in parallel in the heating unit by heating unit be divided into the first air-inlet cavity and First air-out chamber, the bottom end of the condenser and the bottom end of heat pipe condenser section are equipped with condensate collector, first air-inlet cavity It is equipped with the first air inlet and the second air inlet, first air inlet is equipped with the first air-valve, is set on second air inlet There are the second air-valve, first air-out chamber to be equipped with the first air outlet, the evaporator and the heat pipe evaporator section are set up in parallel Dehumidifying backheat unit is divided into the second air-inlet cavity and the second air-out chamber, second air-inlet cavity in the dehumidifying backheat unit It is equipped with third air inlet and fresh air inlet, the third air inlet is equipped with third air-valve, and the fresh air inlet is equipped with the Four air-valves, second air-out chamber are equipped with the second air outlet and exhaust outlet, and the exhaust outlet is equipped with evaporator fan and the Five air-valves, the drying room be equipped with air outlet and return air inlet, the air outlet be equipped with circulating fan and with the first air outlet It is connected, second air inlet, third air inlet are connected with return air inlet, first air inlet and second outlet air Mouth is connected, and the fresh air inlet, the exhaust outlet are connected with external environment, when running open type hot wind mode：Circulating fan It opens, evaporator fan is opened, and the first air-valve is opened, and the second air-valve is closed, and third air-valve is closed, and the 4th air-valve is opened, and the 5th Air-valve is opened；When running enclosed hydrofuge pattern：Circulating fan is opened, and evaporator fan is closed, and the first air-valve is closed, the second air-valve It opens, third air-valve is opened, and the 4th air-valve is closed, and the 5th air-valve is closed.

2. enclosed hydrofuge and the hot air combined heat pump tobacco leaf drying room used of open type according to claim 1, it is characterised in that： Further include having controller, first air-valve, the second air-valve, third air-valve, the 4th air-valve, the 5th air-valve be Electric air valve simultaneously It controls and connects with the controller, the evaporator fan and the circulating fan are connected with controller control.

3. enclosed hydrofuge and the hot air combined heat pump tobacco leaf drying room used of open type according to claim 1, it is characterised in that： The top of drying room is equipped with orifice-plate type air duct, and the orifice-plate type air duct is connected with the air outlet, and the orifice-plate type air duct is One tablet for carrying cavity, has been evenly distributed multiple exhaust vents on bottom surface.

4. enclosed hydrofuge and the hot air combined heat pump tobacco leaf drying room used of open type according to claim 3, it is characterised in that： Cigarette frame is equipped in the drying room, the cigarette frame includes level frame and supporting rack, the bottom and top of support frame as described above and drying room Portion is connected, and the level frame is equipped with cigarette grip hanger.

5. enclosed hydrofuge and the hot air combined heat pump tobacco leaf drying room used of open type according to claim 1, it is characterised in that： The control hot cell is divided into three units that upper, middle and lower is arranged in order, and the heating unit is located at top, the dehumidifying backheat unit Positioned at middle part, the compressor is arranged in lower unit, and the outer wall of the lower unit, which is equipped with, checks window.

6. enclosed hydrofuge and the hot air combined heat pump tobacco leaf drying room used of open type according to claim 5, it is characterised in that： It is separated by partition between the heating unit and the dehumidifying backheat unit, first air inlet is arranged in heating unit Bottom, second air outlet are arranged in correspondence at the top of dehumidifying backheat unit.

7. enclosed hydrofuge and the hot air combined heat pump tobacco leaf drying room used of open type according to claim 1, it is characterised in that： The control hot cell is arranged in one end of drying room, and the other end of the drying room is equipped with door, and the door is equipped with switch, institute It states and is additionally provided with observation window on the both sides and door of drying room.