CN111664657A - A heat pump drying chamber - Google Patents

Abstract

The invention belongs to the field of heat pump drying, in particular to a heat pump drying chamber, comprising a heat pump main engine, a clapboard, a return air baffle, a material tray and a temperature and humidity transmitter; the clapboard divides the drying chamber into an air inlet cavity and a drying cavity; There is a material tray in the drying chamber, a bottom air inlet channel is arranged under the material tray, and a bottom air inlet grille is arranged between the material tray and the bottom air inlet channel; the drying chamber is also provided with a side air inlet channel and a side return air channel , the material tray and the side air inlet channel are separated by the side inlet air grille, and the material tray and the side return air channel are separated by the side return air valve; the upper material tray is provided with an upper return air channel, and the material tray A return air baffle is arranged between the air return baffle and the upper return air passage; the invention reduces manual operation and realizes automatic control of material drying; increases the flow uniformity of hot air, improves material drying effect, shortens material drying time, and improves production. efficiency.

Description

A heat pump drying chamber

technical field

The invention belongs to the field of heat pump drying, in particular to a heat pump drying chamber.

Background technique

The drying process of agricultural products such as seeds is an important process link to ensure their quality and safe storage. Traditional drying methods such as drying and solar energy are greatly affected by the weather, while hot air drying methods such as coal burning and biomass consume a lot of energy and cause large Therefore, the use of heat pump drying is the development trend of drying methods. For the heat pump drying system, the hot air enters the drying room and absorbs the moisture of the material, and then the hot air with high humidity is discharged outside, thereby reducing the humidity of the hot air in the drying room to achieve continuous drying.

The traditional drying chamber generally adopts the structure of single air inlet and single return air. The low-humidity hot air enters the drying chamber through the air valve and then passes through the material pile to absorb moisture. The generated high-humidity hot air is discharged from the system by the air valve installed on the same side or the opposite side. , This single-structure drying system has obvious defects, including high wind speed near the air inlet and return air, and high air temperature and low humidity on the inlet side, which makes the dehydration of materials near the air inlet and return air. In the drying room, there is even a dead angle of hot air flow in the local position far from the tuyere, resulting in different drying degrees of the same batch of materials at the same time, which reduces the drying quality. Especially for small particle materials, the hot air passing rate is low, and the drying effect inside the pile at local locations is difficult to meet the requirements. At present, there is a lack of a drying chamber structure with uniform air distribution and uniform drying of the same batch of materials.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the above problems existing in the prior art, and proposes a heat pump drying chamber, which adopts the method of multi-position air intake and return air to control the distribution of hot air in the drying chamber, and improves the drying chamber by changing the air inlet and outlet methods. The internal airflow organization form can satisfy the uniform drying of the same batch of materials and improve the drying quality.

The technical solution of the present invention is a heat pump drying chamber, comprising a heat pump main engine, characterized in that the drying chamber further comprises: a partition, a return air baffle, a material tray, and a temperature and humidity transmitter arranged on the material tray The baffle plate divides the drying chamber into an air inlet chamber and a drying chamber; an air intake fan for conveying hot air into the drying chamber is arranged below the baffle plate; multiple Layer material trays, bottom air inlet channels are arranged below the material trays on the bottom layer, and bottom air inlet grilles for controlling the air volume are arranged between the material trays and the bottom air inlet channels; the drying chamber is also provided with side walls The air inlet channel and the side return air channel are separated from the material tray and the side air inlet channel by the side air inlet grille, and the material tray and the side return air channel are separated by the side air return valve; An upper air return channel is arranged above the material tray, and a return air baffle is arranged between the material tray and the upper air return channel to prevent the backflow of high-humidity hot air; the bottom air inlet channel and the side air inlet channel are interconnected; The side return air passage communicates with the upper return air passage.

Preferably, the heat pump main unit is installed in the air inlet cavity at a position close to the air inlet fan, and the air entered by the air inlet valve is heated by the heat pump main unit, and then sent into the bottom air inlet by the air inlet fan aisle.

Preferably, a plurality of the temperature and humidity transmitters are evenly arranged on the material tray, and the temperature and humidity transmitters are used for real-time monitoring of temperature and humidity changes at different positions in the drying chamber.

Preferably, the bottom inlet grille, the side inlet grille and the side return air valve are devices with adjustable opening and closing degrees, and the opening degree of the bottom inlet grille, the side inlet grille and the side return air valve is adjustable. Adjust according to the temperature and humidity in the drying chamber.

Preferably, the air return baffle is half-covered and arranged above the material tray in parallel.

Preferably, the hot air collected through the side return air passage and the upper return air passage is exhausted from the exhaust valve by the exhaust fan.

Beneficial effects of the present invention:

The invention increases the flow uniformity of the hot air and improves the drying uniformity of the drying chamber through the air duct arrangement of the bottom and the side air intake and the top and the side return air;

By setting the bottom air inlet grille and the side air inlet air grille with adjustable openings, the invention changes the flow resistance, realizes uniform air inlet, and reduces the hot air humidity at the bottom of each layer of trays;

The invention improves the direction of the air return at the top of the drying chamber by setting the air return baffle, and prevents the local return of the hot air from causing uneven drying of the materials in the top tray;

The invention realizes the layered dehumidification of the material tray by arranging the side air return valve on each layer of the material tray;

The invention monitors the temperature and humidity in the drying room in real time by setting the temperature and humidity transmitter, and adjusts the opening of each inlet grille and air valve based on this.

Description of drawings

1 is a schematic structural diagram of a heat pump drying chamber provided by the present invention;

In the figure, 1. Exhaust valve; 2. Air inlet valve; 3. Side return air valve; 4. Heat pump main engine; 5. Inlet fan; 6. Bottom air inlet grille; 7. Bottom air inlet channel; 8. Side air inlet channel; 9. Side air inlet grille; 10. Material tray; 11. Temperature and humidity transmitter; 12. Return air baffle; 13. Upper return air channel; 14. Exhaust fan; 15. Side return Air channel; 16. Clapboard.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and embodiments.

As shown in FIG. 1 , the present invention is a heat pump drying chamber, including a heat pump host 4, a partition plate 16, a return air baffle 12, a material tray 10 and a temperature and humidity transmitter 11 arranged on the material tray 10; The plate 16 divides the entire heat pump drying chamber into two parts, an air inlet chamber and a drying chamber, and an air inlet fan 5 for conveying hot air into the drying chamber is arranged below the partition plate 16; the air inlet chamber and the drying chamber are communicated through the air inlet fan 5 The hot air is sent into the drying chamber through the air inlet fan 5. The drying chamber is provided with multi-layer material trays 10 from top to bottom. Each layer of material trays 10 has gas permeability, and the drying hot air can penetrate the material trays 10. There is a bottom air inlet grill 6 between the bottom material tray 10 and the bottom air inlet channel 7 for controlling the air volume; the left and right sides of the material tray 10 are respectively provided with a side air inlet channel 8 and a side return air channel 15. A side inlet air grille 9 is arranged between the air channel 8 and the material tray 10, and a side air return valve 3 is arranged between the side return air channel 15 and the material tray 10; the drying hot air enters the material tray 10 through the side inlet air grille 9 After drying and mixing with the air that penetrates the lower material tray 10, a part enters the side return air passage 15 through the side return air valve 3, and the other part continues to penetrate the upper material tray 10 for drying. The air humidity of each layer penetrating the material tray 10 is similar to ensure drying quality; the bottom air inlet grille 6, the side air inlet air grille 9 and the side return air valve 3 are devices with adjustable opening and closing degrees; the upper part of the material tray 10 is provided with There is an upper return air channel 13, between the material tray 10 and the upper return air channel 13 there is a return air baffle 12 for improving the return air direction at the top, and the return air baffle 12 is half-covered. The high-humidity hot air penetrating from the top material tray 10 is guided into the upper return air channel 13, and at the same time, it can also prevent the local return of the high-humidity hot air in the upper return air channel 13 and cause uneven drying of the materials in the top material tray 10.

The heat pump main engine 4 is installed in the air inlet cavity at a position close to the air inlet fan 5. After the air entered by the air inlet valve 2 is heated by the heat pump main engine 4, it is sent into the bottom air inlet channel 7 by the air inlet fan 5;

A plurality of temperature and humidity transmitters 11 are evenly arranged on the material tray 10. The temperature and humidity transmitters 11 can monitor the temperature and humidity changes at different positions in the drying room in real time, and according to the temperature and humidity changes, the bottom air inlet grille 6 is adjusted. , Adjust the opening and closing degree of the grille of the side air inlet grille 9 and the opening and closing degree of the side return air valve 3; the bottom air inlet channel 7 is communicated with the side air inlet channel 8; the upper return air channel 13 is connected with the side return air channel 15. The exhaust fan 14 is arranged at the intersection of the upper return air passage 13 and the side return air passage 15 and is close to the exhaust valve 1. The hot air collected by the side return air passage 15 and the upper return air passage 13 is discharged from the exhaust fan 14. Air valve 1 is discharged.

Working process and principle of the present invention:

When the work starts, the air inlet valve 2 is opened, and the outside natural air enters the air inlet cavity of the drying room. After being processed by the heat pump host 4, the outside natural air becomes dry hot air, and the dry hot air is sent by the air intake fan 5 into the bottom air inlet channel 7. Inside, the drying hot air entering the bottom air inlet channel 7 is divided into two parts, one part enters the bottom material tray 10 through the bottom air inlet grille 6, penetrates the material in the tray, dries the material, and the other part enters the side air inlet channel 8. The side inlet grille 9 enters the bottom of the material tray 10 on the upper layer; because the material tray 10 is penetrable, a part of the high-humidity hot air flowing through the material trays 10 of each layer enters the side return air passage 15 through the side return air valve 3 The other part penetrates the upper material tray 10 to continue drying the material; finally, the high-humidity hot air that penetrates the top tray changes direction through the return air baffle 12 and then enters the upper return air passage 13, and the side return air passage 15. After the hot air is mixed, it is discharged from the drying chamber by the exhaust fan 14 through the exhaust valve 1 .

During work, the temperature and humidity transmitter 11 can monitor the temperature and humidity of different positions in the drying room in real time, and adjust the opening of each grille and air valve based on this, so as to change the amount of hot air that penetrates the material and achieve uniform and adjustable drying. .

The advantages of the invention are that manual operation can be reduced, and automatic control of material drying can be realized; the structural design of multi-air passages, multi-grids and multi-air valves increases the flow uniformity of drying hot air and effectively improves the simultaneous uniform drying of multi-layer materials. At the same time, it can effectively discharge the dried hot air quickly, reduce its residence time in the tray, greatly shorten the drying time of materials, and improve production efficiency.

Claims (6)

1. A heat pump drying chamber, comprising a heat pump host (4), characterized in that the drying chamber further comprises: a partition plate (16), a return air baffle (12), a material tray (10) and a A temperature and humidity transmitter (11) on the material tray (10); the partition plate (16) separates the drying chamber into an air inlet chamber and a drying chamber; an air inlet fan (5) for conveying hot air; a multi-layer material tray (10) is arranged in the drying chamber in sequence from top to bottom, and a bottom air inlet channel (7) is arranged below the material tray (10) on the bottom layer, Between the material tray (10) and the bottom air inlet channel (7), a bottom air inlet grille (6) for controlling the air volume is arranged; the drying chamber is also provided with a side air inlet channel (8) and a side return air channel (8) An air passage (15), the material tray (10) and the side air inlet passage (8) are separated by a side air inlet grill (9), the material tray (10) and the side return air passage (15) They are separated by a side return air valve (3); an upper return air passage (13) is arranged above the material tray (10) on the upper layer, and the material tray (10) and the upper return air passage (13) A return air baffle (12) for preventing the backflow of high-humidity hot air is provided; the bottom air inlet channel (7) communicates with the side air inlet channel (8); the side return air channel (15) and the upper return air channel (13) Intercommunication. 2. A heat pump drying chamber according to claim 1, characterized in that, the heat pump main engine (4) is installed in the air inlet chamber at a position close to the air inlet fan (5), and is controlled by the air inlet valve (2). ) into the air after being heated by the heat pump main unit (4), and then fed into the bottom air inlet channel (7) by the air inlet fan (5). 3. A heat pump drying chamber according to claim 1, characterized in that, a plurality of said temperature and humidity transmitters (11) are evenly arranged on said material tray (10), said temperature and humidity transmitters (11) It is used for real-time monitoring of temperature and humidity changes at different positions in the drying chamber. 4. A heat pump drying chamber according to claim 1, characterized in that, the bottom air inlet grille (6), the side air inlet grille (9) and the side return air valve (3) are adjustable in opening and closing. The opening degree of the bottom air intake grill (6), the side air intake grill (9) and the side return air valve (3) is adjusted according to the temperature and humidity in the drying chamber. 5 . The heat pump drying chamber according to claim 1 , wherein the air return baffle ( 12 ) is half-covered and arranged above the material tray ( 10 ) in parallel. 6 . 6. A heat pump drying chamber according to claim 1, characterized in that, the hot air collected through the side return air passage (15) and the upper return air passage (13) is removed by the exhaust fan (14). The exhaust valve (1) is discharged.

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