Tobacco seedling raising greenhouse temperature increasing system

Abstract

The utility model discloses a tobacco seedling raising greenhouse warming system which comprises a heating chamber, a heating device, a warming pipeline and a controller, the heating chamber is located outside a seedling raising greenhouse, the heating device is arranged in the heating chamber, the warming pipeline is hung on a steel framework in the seedling raising greenhouse, an air inlet is formed in the bottom of the heating chamber, and the heating chamber and the seedling raising greenhouse are communicated through the air inlet. An air outlet pipe is arranged on the upper portion of the heating chamber and connected with a temperature increasing pipeline, a circulating fan is arranged above the heating device in the heating chamber, and low-temperature air in the seedling raising greenhouse enters the heating chamber through an air inlet, enters the air outlet pipe and the temperature increasing pipeline under the suction action of the circulating fan after being heated by the heating device and returns to the seedling raising greenhouse. The controller controls the temperature change in the seedling raising greenhouse, adjusts the feeding amount of the burner of the heating device, and always keeps the temperature in the seedling raising greenhouse in a temperature range suitable for growth of tobacco seedlings.

Description

Technical Field

[0001] This utility model belongs to the field of greenhouse technology, specifically relating to a heating system for a tobacco seedling greenhouse. Background Technology

[0002] In the Zhumadian tobacco-growing area, the sowing period for tobacco seedlings is generally from late January to early February. During this period, seedling greenhouses are susceptible to extreme weather conditions such as heavy snow and blizzards, facing the risk of collapse under the weight of snow and damaging the seedling facilities. Furthermore, sudden drops in temperature can easily lead to late frosts and cold snaps in spring, affecting the quality of the seedlings. To ensure the normal operation of seedling greenhouses under extreme weather conditions and to address the problem of low-temperature damage, current greenhouse heating methods involve placing furnaces inside the greenhouse. However, this method is not only ineffective but also requires multiple furnaces to operate, failing to adequately meet the usage requirements. Summary of the Invention

[0003] To address the aforementioned problems in the existing technology, this utility model provides a heating system for tobacco seedling greenhouses.

[0004] The purpose of this utility model is achieved in the following way: a heating system for tobacco seedling greenhouses, including a heating chamber, a heating device, a heating pipe, and a controller. The heating chamber is located outside the seedling greenhouse, the heating device is installed inside the heating chamber, and the heating pipe is suspended on the steel frame inside the seedling greenhouse. An air inlet is provided at the bottom of the heating chamber, which connects the heating chamber and the seedling greenhouse. An air outlet is provided at the top of the heating chamber, which connects to the heating pipe. A circulating fan is provided above the heating device inside the heating chamber. Low-temperature air in the seedling greenhouse enters the heating chamber through the air inlet, is heated by the heating device, and then enters the air outlet and the heating pipe under the suction of the circulating fan, returning to the seedling greenhouse.

[0005] The heating chamber includes a base, a top canopy, and four walls composed of rock wool panels;

[0006] The heating device includes a heating furnace, a heat exchanger, and a burner. A storage tank is installed on the upper part of the burner, and a conveying auger is installed inside the burner. The conveying auger is driven by a geared motor to transport the material in the storage tank to the combustion basin. The bottom of the combustion basin has a hollow structure. An electric slag pusher is installed below the conveying auger. An air duct is also installed below the conveying auger. One end of the air duct is connected to a variable frequency blower, and the other end is connected to the combustion basin. An ignition rod is also installed on the wall of the air duct. The combustion basin of the burner extends into the heating furnace. A heat exchanger is connected above the heating furnace. The heat exchanger is connected to a chimney. The chimney extends out of the heating chamber wall and into the outside. A slag outlet is also installed at the bottom of the heating furnace.

[0007] The heating pipe includes a longitudinal long air duct and a transverse long air duct that are interconnected. Several short air ducts are evenly arranged on the transverse long air duct. An air outlet grid is installed at the end of the short air duct. Multiple temperature sensors are evenly arranged on the transverse long air duct and the longitudinal long air duct.

[0008] The controller is fixedly installed on one side wall of the heating chamber, and the temperature sensor, variable frequency blower, and geared motor are all connected to the controller.

[0009] The base is welded from channel steel, and four adjustable screws are installed at the bottom of the base.

[0010] A fan platform is fixedly installed on the wall inside the heating chamber, and a circulating fan is installed on the fan platform.

[0011] The heat exchanger is connected above the heating furnace via a left and right fire pit box.

[0012] A ash removal door is installed on each of the two opposite walls of the heating chamber, corresponding to the left and right fire pit boxes respectively.

[0013] The heating chamber walls are also equipped with fan access doors.

[0014] Compared to existing technologies, the tobacco seedling greenhouse heating system disclosed in this utility model includes a heating chamber, a heating device, heating pipes, and a controller. The heating chamber is located outside the seedling greenhouse, the heating device is installed inside the heating chamber, and the heating pipes are suspended on the steel frame inside the seedling greenhouse. Low-temperature air from inside the seedling greenhouse enters the heating chamber through an air inlet at the bottom of the heating chamber. After being heated by the heating device, the air is drawn back into the air outlet pipe and heating pipes by a circulating fan, returning to the seedling greenhouse. The controller controls the temperature changes inside the greenhouse and adjusts the feed rate of the burner in the heating device to maintain the temperature inside the seedling greenhouse within the suitable range for tobacco seedling growth. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the heating chamber.

[0017] Figure 3 This is a structural schematic diagram of the heating chamber from another angle.

[0018] Figure 4 This is a schematic diagram of the heating device.

[0019] Figure 5 This is a schematic diagram of the heating furnace.

[0020] Figure 6 This is a schematic diagram of the burner.

[0021] In the diagram: 100-Heating chamber, 200-Heating device, 300-Heating pipe, 1-Screw rod, 2-Base, 3-Heating furnace, 31-Slag outlet, 32-Left fire pit box, 33-Right fire pit box, 34-Burner connection interface, 35-Heat sink, 4-Radiator, 41-Finned tube, 5-Burner, 51-Storage bin, 511-Material level observation window, 512-Discharge port, 513-Box cover, 52-Conveying auger, 5 3-Combustion basin, 54-Electric slag pusher, 55-Variable frequency blower, 56-Ignition rod, 57-Protective cover, 58-Geared motor, 7-Blower platform, 8-Circulating fan, 9-Chimney, 10-Ash cleaning door, 11-Air inlet, 12-Canopy, 13-Air outlet duct, 14-Blower maintenance door, 15-Short duct, 16-Long duct, 17-Air outlet grille, 18-Controller, 19-Temperature sensor, 20-Rock wool board. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention. After reading the contents of the present invention, those skilled in the art can make various modifications or alterations to the present invention, and these equivalent forms also fall within the scope defined by the present invention.

[0023] like Figure 1 As shown, the heating system for a tobacco seedling greenhouse includes a heating chamber 100, a heating device 200, a heating pipe 300, and a controller 18. The heating chamber 100 is located outside the seedling greenhouse, the heating device 200 is installed inside the heating chamber 100, and the heating pipe 300 is suspended on the steel frame inside the seedling greenhouse. An air inlet 11 is provided at the bottom of the heating chamber 100, which connects the heating chamber 100 and the seedling greenhouse. An air outlet 13 is provided at the top of the heating chamber 100, which connects to the heating pipe 300. A circulating fan 8 is provided above the heating device 200 inside the heating chamber 100. Low-temperature air in the seedling greenhouse enters the heating chamber 100 through the air inlet 11, is heated by the heating device 200, and then enters the air outlet 13 and the heating pipe 300 under the suction of the circulating fan 8, returning to the seedling greenhouse.

[0024] like Figure 2 , Figure 3 As shown, the heating chamber 100 includes a base 1, a top canopy 12, and surrounding walls composed of high-temperature resistant and heat-insulating rock wool boards 20. The base 1, the top canopy 12, and the surrounding walls form a relatively enclosed space. Low-temperature air entering from the seedling greenhouse is heated in the heating chamber 100 by a heating device. Furthermore, the base 2 is welded from channel steel, and four adjustable screw rods 1 are installed below the base 2. When the ground is uneven, the screw rods 1 are adjusted to make the base level.

[0025] like Figure 4-6 As shown, the heating device 200 includes a heating furnace 3, a heat exchanger 4, and a burner 5. A storage tank 51 is installed on the upper part of the burner 5, and a conveying auger 52 is installed inside the burner 5. The conveying auger 52 is driven by a geared motor 58 to convey the material in the storage tank to the combustion basin 53. The bottom of the combustion basin 53 has a hollow structure. An electric slag pusher 54 is installed below the conveying auger 52. An air duct is also installed below the conveying auger 52. One end of the air duct is connected to a variable frequency blower 55, and the other end is connected to the combustion basin 53. An ignition rod 56 is also installed on the pipe wall of the air duct. The combustion basin 53 of the burner 5 extends into the heating furnace 3 through the burner interface 34. The heat exchanger 4 is connected to the upper part of the heating furnace 3. The heat exchanger 4 is connected to a chimney 9. The chimney 9 extends out of the heating chamber wall and discharges the waste flue gas into the air. A slag outlet 31 is also provided at the lower part of the heating furnace 3.

[0026] The heating furnace 3 and heat exchanger 4 are made of highly corrosion-resistant acid-resistant steel. The flue gas ducts and support frames of both parts are bolted together. The heat exchanger 4 has 7 finned tubes 41 at the bottom and 3 plain tubes at the top. The heating furnace 3 is welded from an elliptical furnace top, cylindrical furnace walls, and a circular furnace bottom. The furnace top and walls are fully welded using butt joints or interlocking methods, while the furnace walls and bottom are fully welded using butt joints. Heat sinks 35 are added to the furnace top and flue gas ducts. All metal surfaces are treated with environmentally friendly materials that are resistant to temperatures above 500℃, oxidation-resistant, and have strong adhesion for corrosion protection. All welded parts use welding materials consistent with the base material to ensure that all welds are tight, smooth, free of porosity, slag inclusions, and leaks, achieving the mechanical properties of the base material. The heating furnace has a service life of over 10 years.

[0027] The inner wall of the storage bin 51 of the burner 5 is smooth, and the angle between the discharge ramp and the horizontal plane is ≥40°, with no dead corners, facilitating fuel sliding and preventing material jamming. The bin is equipped with a material level observation window 511, a discharge port 512, and a bin cover 513. The material level observation window 511 is made of transparent materials such as tempered glass and is easy to replace. The bin cover 513 covers the entire top of the storage bin 51 and is equipped with a handle.

[0028] Biomass fuel is transported by a conveying auger 52. The conveying auger 52 is equipped with a backfire prevention structure to prevent backfire from igniting the material in the storage bin 51, and has an anti-backflow function to prevent flue gas from flowing back. The shaft end of the conveying auger 52 is directly driven by a geared motor 58, and the operating frequency of the geared motor 58 is controlled by a controller 18. The bottom of the combustion bowl 53 has a hollow structure, and a variable frequency blower 55 sends air into the air duct to provide the air required for combustion at the bottom of the combustion bowl 53. The variable frequency blower 55 and the air duct ensure normal air distribution in the combustion system.

[0029] The electric ash pusher 54 is made of 06Cr25Ni20 stainless steel. Under normal working conditions, it automatically discharges the ash and coke produced by fuel combustion to the outside of the burner and removes them from the outside of the heating furnace 3 and heating chamber 100 through the ash outlet 31.

[0030] The material conveying auger 52, electric slag pusher 54, air duct, etc. are enclosed in the protective cover 57, which is neat and beautiful.

[0031] The controller 18 provides integrated control of the burner 5 and the variable frequency blower 55, enabling automatic feeding, ignition, air distribution for combustion, heat load adjustment, ash and slag removal, automatic recovery after power failure, and reverse discharge control for the burner 5. The temperature sensor 19 is connected to the controller, enabling automatic temperature control in seedling greenhouses. Connecting the circulating fan 8 to the controller 18 also provides overvoltage, overcurrent, short circuit, phase loss, and phase sequence protection for the circulating fan 8.

[0032] The burner 5 is connected to the controller 18 via a 12-core cable and a TQ / KZ aviation plug. The required temperature for the seedling greenhouse is set on the controller's human-machine interface. When the temperature is lower than the set temperature, the temperature sensor 19 sends a signal to the controller 18, which then issues a feeding command. The geared motor 58 drives the conveying auger 52 to rotate, allowing biomass pellet fuel to enter the combustion basin 53 for combustion. When the temperature in the seedling greenhouse reaches the set temperature, the controller 18 issues a command to reduce the operating frequency of the geared motor 58, reducing the amount of biomass fuel entering the combustion basin 53 and preventing the burner 5 from shutting off. When the temperature falls below the set temperature, the above process is repeated. During normal operation of the burner 5, the controller 18 issues a slag removal command every minute. The electric slag pusher 54 reciprocates once, pushing out the ash and slag.

[0033] The heating pipe 300 includes a longitudinal long air duct 16 and a transverse long air duct that are interconnected. Several short air ducts 15 are evenly arranged on the transverse long air duct. An air outlet grille 17 is installed at the end of the short air duct 15. Several temperature sensors 19 are evenly arranged on the transverse long air duct and the longitudinal long air duct 16. The controller 18 is fixedly installed on one side wall of the heating chamber. The temperature sensors 19, the variable frequency blower 55, and the geared motor are all connected to the controller 18.

[0034] The heating pipes 300 inside the seedling greenhouse are composed of both stainless steel and PVC pipes. The long duct 16 uses PVC pipe, while the short duct 15 uses stainless steel pipe. Stainless steel pipe conducts heat quickly, aiding in heat dissipation, while PVC pipe is inexpensive and easy to install. The heating pipes employ a two-stage tree-like structure with evenly distributed air outlets. Each outlet is equipped with an air grate 17 to disperse the hot airflow and prevent it from directly blowing onto the tobacco seedlings, thus avoiding damage.

[0035] Furthermore, a fan platform 7 is fixedly installed on the inner wall of the heating chamber 100, and a circulating fan 8 is installed on the fan platform 7 and fixed securely.

[0036] Furthermore, the heat exchanger 4 is connected above the heating furnace 3 via the left fire pit box 32 and the right fire pit box 33. The left fire pit box 32 and the right fire pit box 33 are prone to ash accumulation. On the opposite side walls of the heating chamber 100, a ash removal door 10 is provided at the positions corresponding to the left fire pit box 32 and the right fire pit box 33, respectively, to facilitate the ash accumulation and cleaning of the left fire pit box 32 and the right fire pit box 33.

[0037] Furthermore, a fan inspection door 14 is also provided on the wall of the heating chamber 100, which corresponds to the position of the circulating fan 8, making it convenient to inspect and maintain the circulating fan 8.

[0038] This utility model discloses a heating system for tobacco seedling greenhouses, comprising a heating chamber, a heating device, heating pipes, and a controller. The heating chamber is located outside the seedling greenhouse, the heating device is installed inside the heating chamber, and the heating pipes are suspended from the steel frame inside the seedling greenhouse. Low-temperature air from inside the seedling greenhouse enters the heating chamber through an air inlet at the bottom, is heated by the heating device, and then, under the suction of a circulating fan, enters the air outlet pipe and the heating pipe, returning to the seedling greenhouse. The controller controls the temperature changes inside the greenhouse and adjusts the feed rate of the burner in the heating device to maintain the temperature inside the seedling greenhouse within the suitable range for tobacco seedling growth. Humidity inside the seedling greenhouse is handled and regulated by other systems for fresh air compensation and is not within the scope of protection of this utility model.

[0039] The above description is only a preferred embodiment of the present utility model. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present utility model, and these should also be considered within the protection scope of the present utility model.

Claims

1. A heating system for tobacco seedling greenhouses, characterized in that: The system includes a heating chamber (100), a heating device (200), a heating pipe (300), and a controller (18). The heating chamber (100) is located outside the seedling greenhouse. The heating device (200) is installed inside the heating chamber (100). The heating pipe (300) is suspended on the steel frame inside the seedling greenhouse. An air inlet (11) is provided at the bottom of the heating chamber (100). The air inlet (11) connects the heating chamber (100) and the seedling greenhouse. An air outlet pipe (13) is provided at the top of the heating chamber (100). The air outlet pipe (13) is connected to the heating pipe (300). A circulating fan (8) is provided above the heating device (200) inside the heating chamber (100). Low-temperature air in the seedling greenhouse enters the heating chamber (100) through the air inlet (11). After being heated by the heating device (200), the air enters the air outlet pipe (13) and the heating pipe (300) under the suction of the circulating fan (8) and returns to the seedling greenhouse. The heating chamber (100) includes a base (2), a top canopy (12), and four walls composed of rock wool panels (20); The heating device (200) includes a heating furnace (3), a heat exchanger (4) and a burner (5). A storage box (51) is set on the upper part of the burner (5). A conveying auger (52) is set inside the burner (5). The conveying auger (52) is driven by a geared motor (58) to convey the material in the storage box to the combustion basin (53). The bottom of the combustion basin (53) is a hollow structure. An electric slag pusher (54) is set below the conveying auger (52). An air duct is also set below the conveying auger (52). One end of the air duct is connected to a variable frequency blower (55), and the other end is connected to the combustion basin (53). An ignition rod (56) is also set on the pipe wall of the air duct. The combustion basin (53) of the burner (5) extends into the heating furnace (3). The heat exchanger (4) is connected above the heating furnace (3). The heat exchanger (4) is connected to a chimney (9). The chimney (9) extends out of the heating chamber wall. A slag outlet (31) is also set at the lower part of the heating furnace (3). The heating pipe (300) includes a longitudinal long air pipe (16) and a transverse long air pipe that are interconnected. Several short air pipes (15) are evenly arranged on the transverse long air pipe. An air outlet grid (17) is installed at the end of the short air pipe (15). Multiple temperature sensors (19) are evenly arranged on the transverse long air pipe and the longitudinal long air pipe (16). The controller (18) is fixedly installed on one side wall of the heating chamber. The temperature sensor (19), the variable frequency blower (55), and the geared motor are all connected to the controller (18).

2. The tobacco seedling greenhouse heating system according to claim 1, characterized in that: The base (2) is welded from channel steel, and four adjustable screw rods (1) are installed under the base (2).

3. The heating system for tobacco seedling greenhouses according to claim 1, characterized in that: A fan platform (7) is fixedly installed on the inner wall of the heating chamber (100), and a circulating fan (8) is installed on the fan platform (7).

4. The heating system for tobacco seedling greenhouses according to claim 1, characterized in that: The heat exchanger (4) is connected above the heating furnace (3) via the left fire basin box (32) and the right fire basin box (33).

5. The heating system for tobacco seedling greenhouses according to claim 4, characterized in that: A cleaning door (10) is installed on each of the two opposite walls of the heating chamber (100), and the two cleaning doors (10) correspond to the left fire pit box (32) and the right fire pit box (33) respectively.

6. The tobacco seedling greenhouse heating system according to claim 1, characterized in that: A fan access door (14) is also installed on the wall of the heating chamber (100).

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