Greenhouse air source heat pump system

Abstract

The utility model discloses an air source heat pump system for a greenhouse. The air source heat pump system comprises an air source heat pump device and a heat exchange ventilation device, the heat exchange ventilation device comprises an air duct arranged at the top of the greenhouse and U-shaped air pipes uniformly distributed on the low wall of the greenhouse, and an induced draft fan is arranged in the air duct; dumbbell-shaped sections are arranged at the two ends of the U-shaped air pipe respectively, and compressed gas nozzles are coaxially arranged at the throat parts of the dumbbell-shaped sections; an air outlet pipe facing the inner side of the greenhouse is further arranged on the U-shaped air pipe, a plurality of heat exchange pipes connected with the hot water discharging pipe are arranged in the air outlet pipe, and a plurality of vortex generating rods are correspondingly arranged in the positions, on the upper side and the lower side of an inlet of the air outlet pipe, of the U-shaped air pipe respectively. Hot water is generated through the air source heat pump device, turbulent airflow is generated through ejection of the heat exchange air exchange device and exchanges heat with the hot water in a dividing wall mode, compared with the prior art, hot air is generated fast, the air volume is large, the air exchange requirement of the greenhouse is met, and meanwhile fluctuation of the air temperature in the greenhouse is reduced.

Description

Technical Field

[0001] The utility model relates to the field of greenhouse supporting equipment, in particular to an air source heat pump system for a greenhouse. Background Art

[0002] An air source heat pump is an energy-saving device that uses high-level energy to make heat flow from a low-level heat source to a high-level heat source. It is widely used in residential buildings and industrial and agricultural production facilities. Greenhouses equipped with air source heat pump systems are representative examples of this. However, in actual production processes, it has been found that greenhouses require regular and large-scale ventilation according to plant growth needs. The air source heat pump system in existing greenhouses produces heat slowly. A large amount of low-temperature air rushing into the greenhouse will cause large temperature fluctuations, which is not conducive to maintaining a constant temperature in the greenhouse. Therefore, a greenhouse air source heat pump system that produces a large ventilation volume and generates hot air quickly is needed. Utility Model Content

[0003] In view of the problems existing in the background technology, the purpose of the utility model is to provide a greenhouse air source heat pump system, which effectively solves the problems existing in the background technology.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A greenhouse air source heat pump system, comprising an air source heat pump device and a heat exchange ventilation device; the air source heat pump device comprises an evaporator, a gas-liquid separator, a compressor, a condenser, a filter and an expansion valve arranged in sequence, a hot water tank is also arranged on one side of the condenser, the hot water tank is connected to the condenser through a water inlet pipe and a water outlet pipe, a circulating pump is arranged on the water outlet pipe, and a water supply pipe and a hot water discharge pipe are also arranged on the hot water tank;

[0006] The heat exchange ventilation device includes an air duct placed on the top of the greenhouse and U-shaped air ducts evenly distributed on the low wall of the greenhouse, wherein an induced draft fan is arranged in the air duct; both ends of the U-shaped air duct respectively have dumbbell-shaped sections, and a compressed gas nozzle is coaxially arranged at the throat of the dumbbell-shaped section; the U-shaped air duct is also provided with an air outlet pipe facing the inner side of the greenhouse, and a plurality of heat exchange pipes connected to the hot water discharge pipe are arranged in the air outlet pipe, and a plurality of vortex generating rods are respectively arranged in the U-shaped air ducts on the upper and lower sides of the air outlet pipe inlet, and the plurality of vortex generating rods are evenly distributed in the horizontal direction.

[0007] Furthermore, the compressed gas nozzle is connected to an air supply pipe, the air supply pipe is connected to an air storage tank, and the air storage tank is connected to an air compressor.

[0008] Furthermore, the outlet of the air outlet pipe is trumpet-shaped.

[0009] Furthermore, the heat exchange tube is a fin tube, and both ends of the fin tube are respectively connected to a water distribution tank and a water collection tank, and the water distribution tank and the water collection tank are connected in series to the hot water discharge pipe.

[0010] Furthermore, the cross section of the vortex generating rod is an isosceles trapezoid, and the longer side of the parallel sides of the isosceles trapezoid faces the incoming wind direction.

[0011] The utility model has the following beneficial technical effects:

[0012] In the utility model, hot water is generated by an air source heat pump device and turbulent airflow is generated by a heat exchange ventilation device to exchange heat between the hot water and the hot water. Compared with the prior art, hot air is generated quickly and in large volume, which not only meets the ventilation needs of the greenhouse but also helps to reduce the fluctuation of air temperature in the greenhouse and maintain a constant temperature in the greenhouse. The application is novel in design and stable in operation and is suitable for popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of an air source heat pump device in an embodiment of the utility model;

[0014] Figure 2 It is a side view of a greenhouse in an embodiment of the utility model;

[0015] Figure 3 It is a schematic structural diagram of a heat exchange ventilation device in an embodiment of the utility model. DETAILED DESCRIPTION

[0016] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0017] In the description of the present utility model, unless otherwise specified, "multiple" means two or more than two; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0018] like Figure 1-3 As shown, a greenhouse air source heat pump system described in this embodiment includes an air source heat pump device 1 and a heat exchange ventilation device 2; the air source heat pump device 1 includes an evaporator 3, a gas-liquid separator 4, a compressor 5, a condenser 6, a filter 7 and an expansion valve 8 arranged in sequence, and a hot water tank 9 is also arranged on one side of the condenser 6. The hot water tank 9 is connected to the condenser 6 through an inlet pipe 10 and an outlet pipe 11. The water flows through the condenser 6 and then returns to the hot water tank 9 after absorbing heat. The water flows and the working medium in the condenser 6 exchange heat between the walls. A circulating pump is arranged on the outlet pipe 11, and a water supply pipe 12 and a hot water discharge pipe 13 are also arranged on the hot water tank 9.

[0019] The heat exchange ventilation device 2 includes an air duct 15 placed on the top of the greenhouse 14 and a U-shaped air duct 17 evenly distributed on the low wall 16 of the greenhouse. An induced draft fan is arranged in the air duct 15; both ends of the U-shaped air duct 17 have dumbbell-shaped sections 18, the dumbbell-shaped section 18 is thin in the middle and thick at both sides, and a compressed gas nozzle 19 is coaxially arranged at the throat of the dumbbell-shaped section 18, and the compressed gas nozzle 19 is connected to an air supply pipe 20, and the air supply pipe 20 is connected to an air storage tank, and the air storage tank is connected to an air compressor;

[0020] The U-shaped air duct 17 is also provided with an air outlet duct 21 facing the inner side of the greenhouse 14. The outlet of the air outlet duct 21 is trumpet-shaped. A plurality of heat exchange tubes 22 connected to the hot water discharge pipe 13 are arranged in the air outlet duct 21. The heat exchange tubes 22 are finned tubes. Both ends of the finned tubes are respectively connected to a water distribution tank 23 and a water collecting tank. The water distribution tank 23 and the water collecting tank are connected in series to the hot water discharge pipe 13. A plurality of vortex generating rods 24 are respectively arranged in the U-shaped air duct 17 on the upper and lower sides of the inlet of the air outlet duct 21. The plurality of vortex generating rods 24 are evenly distributed in the horizontal direction. The cross-section of the vortex generating rod 24 is an isosceles trapezoid and the longer side of the parallel sides of the isosceles trapezoid faces the incoming wind direction.

[0021] The working principle of this embodiment is:

[0022] When the greenhouse 14 is ventilated, high-speed gas is blown into the U-shaped air duct 17 through the compressed gas nozzle 19. The high-speed gas is ejected and mixed with the outside air to flow toward the air outlet duct 21. Before reaching the air outlet duct 21, it blows through the vortex generating rod 24 and forms many small vortices behind the vortex generating rod 24. The small vortices generated by the vortex generating rods 24 on the upper and lower sides collide to form a turbulent airflow. The turbulent airflow contacts the heat exchange tube 22 to absorb heat. Compared with the laminar heat exchange of an ordinary hot air blower, the heat exchange efficiency is significantly improved. The hot water delivered by the hot water tank 9 in the air source heat pump device 1 is passed into the heat exchange tube 22, and the heated gas is delivered to the greenhouse 14. The cooled water returns to the air source heat pump device 1 to absorb heat again. In the embodiment, external air flow is induced through the heat exchange ventilation device 2, and compressed air is used as energy. After the compressed air is ejected into the dumbbell-shaped section 18, it is expanded and the flow rate is increased. Under this action, low pressure and negative pressure can be generated, thereby attracting external air into the U-shaped air duct 17, so that the compressed air is mixed with the induced inhaled gas and then ejected out. The volume of the external air attracted in can reach more than ten times the volume of the compressed air used as the working airflow, meeting the need for replenishing fresh air from the outside in the greenhouse 14; compared with the prior art, the biggest advantage of this embodiment is that the hot air is generated quickly, which meets the ventilation needs of the greenhouse 14 while also helping to reduce the air temperature fluctuation in the greenhouse, which is beneficial to maintaining a constant temperature in the greenhouse 14.

[0023] The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and design various embodiments with various modifications suitable for specific uses.

Claims

1. A greenhouse air source heat pump system, characterized in that: It comprises an air source heat pump device and a heat exchange ventilation device; the air source heat pump device comprises an evaporator, a gas-liquid separator, a compressor, a condenser, a filter and an expansion valve arranged in sequence, a hot water tank is also arranged on one side of the condenser, the hot water tank is connected to the condenser through a water inlet pipe and a water outlet pipe, a circulating pump is arranged on the water outlet pipe, and a water supply pipe and a hot water discharge pipe are also arranged on the hot water tank; The heat exchange ventilation device includes an air duct placed on the top of the greenhouse and U-shaped air ducts evenly distributed on the low wall of the greenhouse, wherein an induced draft fan is arranged in the air duct; both ends of the U-shaped air duct respectively have dumbbell-shaped sections, and a compressed gas nozzle is coaxially arranged at the throat of the dumbbell-shaped section; the U-shaped air duct is also provided with an air outlet pipe facing the inner side of the greenhouse, and a plurality of heat exchange pipes connected to the hot water discharge pipe are arranged in the air outlet pipe, and a plurality of vortex generating rods are respectively arranged in the U-shaped air ducts on the upper and lower sides of the air outlet pipe inlet, and the plurality of vortex generating rods are evenly distributed in the horizontal direction.

2. A greenhouse air source heat pump system according to claim 1, characterized in that: The compressed gas nozzle is connected to an air supply pipe, the air supply pipe is connected to an air storage tank, and the air storage tank is connected to an air compressor.

3. A greenhouse air source heat pump system according to claim 1, characterized in that: The outlet of the air outlet pipe is trumpet-shaped.

4. A greenhouse air source heat pump system according to claim 1, characterized in that: The heat exchange tube is a fin tube, and both ends of the fin tube are respectively connected to a water distribution tank and a water collection tank, and the water distribution tank and the water collection tank are connected in series to the hot water discharge pipe.

5. The greenhouse air source heat pump system according to claim 1, characterized in that: The cross section of the vortex generating rod is an isosceles trapezoid, and the longer side of the parallel sides of the isosceles trapezoid faces the incoming wind direction.

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