CN209512478U - Heat pump drying equipment - Google Patents

Abstract

The utility model embodiment provides a kind of heat pump drying equipment, is related to drying unit technical field.It includes supplies room, separation partition, heat regenerator, heat pump, electrical auxiliary heater and fresh air duct, the air inlet of supplies room is equipped with supply air duct, the air outlet of supplies room is equipped with return airway, separation partition is mounted in return airway and return airway is divided into the first air duct and the second air duct, fresh air duct is connected to by heat regenerator with the second air duct, first air duct is connected by heat regenerator with heat pump, electrical auxiliary heater is mounted on heat pump, and the second air duct is connected with supply air duct by heat pump and electrical auxiliary heater.Heat pump drying equipment provided by the utility model, heat pump is main heating element, electrical auxiliary heater auxiliary heat supplying, it separates partition and return airway is divided into the first air duct and the second air duct channel Liang Ge, the indoor air of material is divided into two parts to handle respectively, improves the utilization rate and the indoor hydrofuge amount of material of heat.

Description

Heat pump drying equipment

technical field

The embodiment of the utility model relates to the technical field of drying devices, in particular to a heat pump drying equipment.

Background technique

Heat pump drying technology has been widely used and developed in the fields of agricultural and sideline product processing, wood drying, grain and food drying, etc. It is also popularized and applied in the roasting process. Among the many products to be baked, the tobacco leaf has a long time to bake, consumes a lot of heat, and has a high temperature (the highest temperature is about 70°C), which is obviously special compared to other products to be baked. In recent years, some heat pump products have been applied to tobacco leaf curing, but there are the following problems: the night temperature in some areas is low, the heat supply of heat pumps is insufficient, and it is difficult to reach the temperature required for curing; Some heat pump drying equipment has insufficient moisture removal; after curing, there are problems such as the veins of the tobacco leaves are easy to turn green, and the ribs are difficult to dry.

Utility model content

(1) Technical problems to be solved

The purpose of the utility model is to provide a heat pump drying equipment to solve the problems of insufficient heat supply and insufficient moisture discharge in the existing drying equipment.

(2) Technical solution

In order to solve the above technical problems, the utility model provides a heat pump drying equipment, including a material chamber, a separation partition, a heat recovery device, a heat pump, an auxiliary electric heater and a fresh air duct, and the air inlet of the material chamber is provided with a An air duct, the air outlet of the material chamber is provided with a return air duct, the separation partition is installed in the return air duct and divides the return air duct into a first air duct and a second air duct , the fresh air duct communicates with the second air duct through the heat recovery device, the first air duct communicates with the heat pump through the heat recovery device, and the auxiliary electric heater is installed on the heat pump Above, the second air duct is connected to the air supply duct through the heat pump and the auxiliary electric heater.

Wherein, the heat pump includes a condenser and an evaporator connected to each other, the air inlet of the condenser is connected with the second air duct, and the air outlet of the condenser is connected with the air supply through the auxiliary electric heater. The air passages are connected, and the first air passage is connected with the air inlet of the evaporator through the heat recovery device.

Wherein, at least one evaporation fan is installed at the air outlet of the evaporator.

Wherein, a circulation fan is installed at the inlet of the air supply duct, and a deflector or an air distribution plate is arranged in the air supply duct.

Wherein, a fresh air damper is installed at the entrance of the fresh air duct, and a dehumidification damper is installed at the air inlet of the evaporator.

Wherein, a fresh air fan is provided at the connection between the heat recovery device and the second air duct, and a moisture exhaust fan is provided between the heat recovery device and the evaporator.

Wherein, a controller is also included, and the controller is used to control the working states of the fresh air valve, the dehumidification air valve, the fresh air fan, the dehumidification fan and the auxiliary electric heater.

Wherein, it also includes a water receiving tray, the water receiving tray is used to accept the condensed water discharged from the drain outlet of the evaporator and the drain outlet of the dehumidification fan, and the water receiving tray is connected with the heat pump through the drain pipe. The external connection of the drying equipment.

Wherein, the auxiliary electric heater includes multi-stage electric heating tubes, and the multi-stage electric heating tubes can be turned on incrementally step by step.

Wherein, the separation partition extends from the heat recovery device to the material chamber, and the ratio of the cross-sectional area of the first air duct to the cross-sectional area of the second air duct is 1:2 to 1: between 4.

(3) Beneficial effects

In the heat pump drying equipment provided by the utility model, the heat pump is the main heating element, and the auxiliary electric heater is used for auxiliary heating, so that the problem of insufficient heating at night in some areas can be solved; the separation partition divides the return air duct into the first The first air channel and the second air channel have two passages, so that part of the air in the material room is discharged after heat and moisture exchange with the fresh air through the heat recovery device, and the other part flows back into the material room as circulating air, which improves the utilization rate of heat. And introduce low-humidity fresh air into the circulating air, improving the moisture removal in the material room.

Description of drawings

Fig. 1 is a schematic structural diagram of a heat pump drying equipment according to an embodiment of the present invention.

In the figure: 1. Material chamber; 2. Separation partition; 3. Heat recovery device; 4. Heat pump; 41. Condenser; 42. Evaporator; 5. Auxiliary electric heater; 6. Air supply duct; 7. Return air duct; 71, first air duct; 72, second air duct; 8, fresh air duct; 9, evaporation fan; 10, circulation fan; 11, deflector plate; 12, fresh air valve; 13, dehumidification Damper; 14. Fresh air fan; 15. Humidity exhaust fan; 16. Controller; 17. Drainage pipe.

Detailed ways

Below in conjunction with accompanying drawing and embodiment, the specific embodiment of the utility model is described in further detail. The following examples are used to illustrate the utility model, but not to limit the scope of the utility model.

In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a flexible connection. Detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.

The heat pump drying equipment in the embodiment of the utility model, as shown in Figure 1, includes a material chamber 1, a separation partition 2, a heat recovery device 3, a heat pump 4 and an auxiliary electric heater 5, and the air inlet of the material chamber 1 is connected to the The air duct 6, the air outlet of the material chamber 1 is connected to the return air duct 7, and the separation partition 2 is installed in the return air duct 7 and divides the return air duct 7 into a first air duct 71 and a second air duct 72 , the fresh air duct 8 communicates with the second air duct 72 through the heat recovery device 3, the first air duct 71 is connected with the heat pump 4 through the heat recovery device 3, the auxiliary electric heater 5 is installed on the heat pump 4, and the second air duct 72 is connected with the heat pump 4. The air supply duct 6 is connected with the auxiliary electric heater 5 through the heat pump 4 .

In this heat pump drying equipment, part of the hot and humid air flowing out from the material chamber 1 enters the first air duct 71, and the external fresh air enters the fresh air duct 8 and is fully cooled with the hot and humid air in the first air duct 71 through the heat recovery device 3. heat exchange. The heat pump 4 is used as the main heating element, and the auxiliary electric heater 5 is used as the auxiliary heating element. After the fresh air absorbs heat, it enters the second air passage 72 and mixes with the air entering the second air passage 72 from the material chamber 1. After the heat pump 4 and the auxiliary electric heater 5 are heated, they enter the material chamber 1 again through the air supply duct 6 to dry the material. Wherein, the heat pump 4 can supply heat alone, and when the heat supply by the heat pump 4 is insufficient, the auxiliary electric heater 5 can be turned on for auxiliary heat supply. In this way, heat energy can be saved, and the problem of insufficient heating at night in some areas can be solved. The hot and humid air flowing out of the material chamber 1 recovers heat through the heat recovery device 3 and then enters the heat pump 4 to recover heat for a second time, which has an outstanding energy-saving effect. During this process, part of the hot and humid air flowing out of the material chamber 1 is discharged through the heat recovery device 3 and the heat pump 4; So as to meet the needs of material drying and dehumidification.

Specifically, the separation partition 2 extends from the heat recovery device 3 to the inner wall of the material chamber 1, thereby separating the return air duct 7 into a first air duct 71 and a second air duct 72. The cross-sectional area of the first air duct 71 is The ratio of the cross-sectional area to the second air duct 72 is between 1:2 and 1:4, which can be adjusted according to the dehumidification conditions of different materials to meet the needs of material drying and dehumidification.

Wherein, the heat pump 4 includes a condenser 41 and an evaporator 42 connected to each other, the air inlet of the condenser 41 is connected with the second air duct 72, and the air outlet of the condenser 41 is connected with the air supply duct 6 through the auxiliary electric heater 5, The first air channel 71 is connected to the air inlet of the evaporator 42 through the heat recovery device 3 . The fresh air after heat exchange in the heat recovery device 3 is mixed with part of the hot and humid air in the material chamber 1 , and enters the material chamber 1 through the air supply duct 6 under the heating of the condenser 41 and the auxiliary electric heater 5 . The hot and humid air entering the first air channel 71 in the material chamber 1 recovers heat through the heat recovery device 3, then enters the evaporator 42 to recover heat again, and then is discharged from the evaporator 42 to the atmosphere. Through two heat recovery, the heat recovery rate is greatly improved. Heat recovery efficiency.

Specifically, the auxiliary electric heater 5 includes multi-stage electric heating pipes, which can be turned on step by step incrementally to provide different levels of heat to meet heat supply while saving energy consumption. One end of the separating partition 2 is installed in the heat pump 4 , and the other end extends to the air inlet of the return air duct 7 .

In order to improve the air outlet efficiency of the evaporator 42 , at least one evaporator fan 9 is installed at the air outlet of the evaporator 42 . When there are multiple evaporation fans 9, the plurality of evaporation fans 9 are evenly distributed longitudinally.

In addition, a circulation fan 10 is installed at the inlet of the air supply duct 6, and under the operation of the circulation fan 10, the heat released by the condenser 41 is transferred to the air in the air supply duct 6. A deflector 11 or an air distribution plate is arranged in the air supply duct 6 so as to divide the air flow into multiple parallel air flows and reduce the resistance of the air flow.

Specifically, a fresh air damper 12 is installed at the entrance of the fresh air duct 8 , and a dehumidification damper 13 is installed at the air inlet of the evaporator 42 . A fresh air blower 14 is provided at the connection between the heat recovery unit 3 and the second air duct 72 , and a dehumidification blower 15 is provided between the heat recovery unit 3 and the evaporator 42 . When the dehumidification capacity is small, it is only necessary to open the fresh air damper 12 and the dehumidification damper 13; Fan 15, so that increase air flow. Therefore, the heat pump drying equipment in the embodiment of the utility model can not only meet products with a lower moisture removal rate, but also meet the different moisture removal requirements of different stages of products, and has a wide range of applications.

In order to realize the automatic control of the equipment, the heat pump drying equipment in the embodiment of the utility model also includes a controller 16, which is used to control the fresh air damper 12, the dehumidification damper 13, the fresh air blower 14, the dehumidification blower 15 and the auxiliary According to the working state of the electric heater 5, adjust the opening and closing degree of the fresh air valve 12 and the dehumidification air valve 13 and the opening or closing of the fresh air fan 14 and the dehumidification fan 15 according to the size of the moisture removal capacity; according to the temperature of the external environment, control the auxiliary The start and stop of electric heater 5.

In addition, the heat pump drying equipment in the embodiment of the utility model also includes a water receiving tray, which is used to receive the condensed water discharged from the drain port of the evaporator 42 and the drain port of the dehumidification fan 15, and the water receiving plate The pan is connected to the outside of the monolithic heat pump device via a drain pipe 17 .

The heat pump drying equipment in the embodiment of the utility model is mainly based on the heat supply of the condenser 41, supplemented by the heat supply of the auxiliary electric heater 5, and the circulating fan 10 provides power for the circulating air; between the heat pump 4 and the material room The air supply duct 6 is connected with the return air duct 7, and the air supply duct 6 is provided with an air distribution plate or a deflector 11; the separation partition 2 can discharge part of the internal circulating air; the air passes through the heat recovery device 3 and The evaporator 42 recovers heat twice, and the energy-saving effect is better; the fresh air damper 12 and the dehumidification damper 13 can meet the dehumidification requirements of products or stages with a low dehumidification rate; the fresh air fan 14 and the dehumidification fan 15 can be used in Turns on when the dehumidification rate is high.

The heat pump drying equipment in the embodiment of the utility model has a wide application range and obvious energy-saving effect, and is especially suitable for drying tobacco leaves. Taking tobacco leaf drying as an example, the function of the heat pump drying equipment in the embodiment of the present invention will be further described. It should be noted that the heat pump drying equipment in the embodiment of the present invention can also be used for drying other materials. , not limited to tobacco leaf curing.

In tobacco leaf curing, the control of dry bulb and wet bulb temperature is very important, wherein the dehumidification process directly affects the wet bulb temperature in the material chamber 1, and then affects the curing effect of the material to be dried, that is, tobacco leaves.

If there is no separation partition 2 installed in the return air duct 7, when the dehumidification work is performed, the air in the material chamber 1 directly enters the inside of the heat pump 4 after passing through the return air duct 7, and the low-humidity fresh air supplemented from the outside is supplied by the fresh air. The fan 14 enters the inside of the heat pump 4 after entering the return air duct 7 . Due to the blockage of the condenser 41 in the heat pump 4, the air in the material chamber 1 and the low-humidity fresh air are mixed in the space below the condenser 41, that is, in the return air duct 7 near the air outlet, and a part of the mixed air passes through the condenser 41 and the auxiliary electric heater 5, enter the material chamber 1 from the air supply duct 6; another part of the mixed air passes through the heat recovery device 3, the dehumidification fan 15, the dehumidification air valve 13, The evaporator 42 and the evaporating fan 9 are discharged to the external atmosphere. This discharge process caused the supplementary fresh air to mix with the internal circulating air and failed to effectively enter the circulation between the materials, but most of it was discharged from the heat pump 4, resulting in a "short circuit", which made the dehumidification effect in the material chamber 1 not good, resulting in The tobacco leaves in the material chamber 1 have veins turning green and leaves not dry.

After the separation partition 2 is installed, the above phenomenon can be effectively avoided. Specifically, when not dehumidifying, the circulating air in the material chamber 1 flows to the second air duct 72 , that is, all the circulating air passes through the condenser 41 , the circulating fan 10 and the air supply duct 6 successively, and then enters the material chamber 1 . When dehumidification work is required, when the circulating air in the material chamber 1 passes through the return air duct 7, it is divided into two parts, one part enters the first air duct 71, and the other part enters the second air duct 72, wherein the first air duct The circulating air in 71 flows successively through the heat recovery device 3, the dehumidifying blower 15, the dehumidifying air valve 13, the evaporator 42 and the evaporating blower 9 and is exhausted to the outside atmosphere; After the introduced external fresh air is mixed, it passes through the condenser 41 , the auxiliary electric heater 5 and the air supply duct 6 successively, and then enters the material chamber 1 . The circulating air in the material chamber 1 is divided into two air streams and does not mix with each other, which can achieve an effective dehumidification effect.

It can be seen from the above that the separation partition 2 passes through the return air duct 7 from the heat recovery device 3 to the air outlet of the material chamber 1, and even extends to the inside of the material chamber 1, thereby separating the lower cavity of the heat pump 4 and the return air. The space formed by the channel 7 is divided into two channels that are not connected, so as to separate the air inlet of the heat recovery device 3 and the air outlet of the fresh air fan 14, so as to prevent the fresh air from being mixed with the circulating air and then be discharged from the heat pump 4, effectively improving the temperature of the low humidity. The flow rate of the fresh air entering the material chamber 1 meets the application requirements of drying and dehumidification.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in the Within the protection scope of the present utility model.

Claims (10)

1. a kind of heat pump drying equipment, which is characterized in that add including supplies room, separation partition, heat regenerator, heat pump, auxiliary electricity Hot device and fresh air duct, the air inlet of the supplies room are equipped with supply air duct, and the air outlet of the supplies room is equipped with return airway, The separation partition is mounted in the return airway and the return airway is divided into the first air duct and the second air duct, described Fresh air duct is connected to by the heat regenerator with second air duct, first air duct pass through the heat regenerator with it is described Heat pump is connected, and the electrical auxiliary heater is mounted on the heat pump, and second air duct and the supply air duct are described in Heat pump is connected with the electrical auxiliary heater.

2. heat pump drying equipment according to claim 1, which is characterized in that the heat pump includes condenser interconnected And evaporator, the air inlet of the condenser are connected with second air duct, the air outlet of the condenser passes through the auxiliary Electric heater is connected with the supply air duct, air inlet phase of first air duct through the heat regenerator with the evaporator Even.

3. heat pump drying equipment according to claim 2, which is characterized in that be equipped at the air outlet of the evaporator to A few evaporation fan.

4. heat pump drying equipment according to claim 2 or 3, which is characterized in that the entrance of the supply air duct is installed There is circulating fan, deflector or air distribution plate are disposed in the supply air duct.

5. heat pump drying equipment according to claim 2, which is characterized in that the inlet of the fresh air duct is equipped with newly Wind air-valve, the air intake vent of the evaporator are equipped with dehumidifying air-valve.

6. heat pump drying equipment according to claim 5, which is characterized in that the heat regenerator and second air duct Junction is equipped with fresh-air fan, and wet-emitting blower is equipped between the heat regenerator and the evaporator.

7. heat pump drying equipment according to claim 6, which is characterized in that further include controller, the controller is used for Control the fresh air air-valve, the dehumidifying air-valve, the fresh-air fan, the work of the wet-emitting blower and the electrical auxiliary heater Make state.

8. heat pump drying equipment according to claim 6, which is characterized in that further include drip tray, the drip tray is used for The condensed water being discharged from the discharge outlet of the evaporator and the discharge outlet of the wet-emitting blower is accepted, the drip tray passes through draining Pipe is connected with the outside of the heat pump drying equipment.

9. heat pump drying equipment according to claim 1, which is characterized in that the electrical auxiliary heater includes multistage electric heating Pipe, the multistage electrothermal tube can be opened incrementally step by step.

10. heat pump drying equipment according to claim 1, which is characterized in that the separation partition is from the heat regenerator It extends in the supplies room, the ratio of the cross-sectional area in the cross-sectional area in first air duct and second air duct is in 1:2 Between~1:4.