Heat collection device for greenhouse

Abstract

The utility model discloses a heat collecting device for a greenhouse, which belongs to the technical field of greenhouse heat energy utilization and comprises a heat collector positioned at the upper part in the greenhouse. An air inlet and an air outlet are formed in the left side and the right side of the box body respectively, the air-water heat exchange device is arranged in the box body, the heat collection plate is obliquely arranged on the side, facing the lighting face of the greenhouse, of the box body, a water path is laid in the heat collection plate, and a buried pipeline for supplying heat to crops is arranged on the lower portion in the greenhouse. An internal water path of the heat collection plate and the air-water heat exchange device are connected in parallel and are connected with a buried pipeline of the greenhouse through the same set of water inlet path and water outlet path, and a circulating water pump is arranged on the water inlet path or the water outlet path. According to the utility model, temperature compensation can be provided for the greenhouse at night so as to ensure the temperature required by crop growth, and the energy consumption of the greenhouse is reduced while the energy utilization efficiency in the greenhouse is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of greenhouse heat energy utilization, and particularly relates to a heat collecting device for a greenhouse. Background Art

[0002] Energy-saving environmental control technology has gradually been applied and studied in solar greenhouses. However, this technology is mostly limited to utilizing waste heat in the air, that is, compensating for temperature loss at night by absorbing and reusing heat from the air inside the greenhouse. The heat source is single, and due to the low heat capacity of the air, the overall thermal efficiency is not ideal.

[0003] Therefore, there is a need for a heat collecting device for a greenhouse that can provide temperature compensation for the greenhouse at night while improving energy utilization efficiency in the greenhouse and reducing energy consumption in the greenhouse. Utility Model Content

[0004] The purpose of the utility model is to provide a heat collecting device for a greenhouse, which can provide temperature compensation for the greenhouse at night to ensure the temperature required for crop growth, improve the energy utilization efficiency in the greenhouse and reduce the energy consumption of the greenhouse.

[0005] In order to achieve the above purpose, the technical solution adopted by the present utility model is:

[0006] A heat collecting device for a greenhouse comprises a heat collector located above the interior of the greenhouse; the heat collector comprises a box body with an air inlet and an air outlet respectively provided on left and right sides, an air-water heat exchange device provided inside the box body, and a heat collecting plate obliquely arranged on the side of the box body facing the daylighting surface of the greenhouse and having a waterway laid inside; an underground pipeline for heating crops is provided below the interior of the greenhouse; the internal waterway of the heat collecting plate and the air-water heat exchange device are provided in parallel, and both are connected to the underground pipeline of the greenhouse through the same set of water inlet and outlet channels, and a circulating water pump is provided on the water inlet or outlet channel.

[0007] A further improvement of the technical solution of the present utility model is that: one end of the water inlet is connected to the outlet of the buried pipeline, and the other end thereof is respectively connected to the internal water channel of the heat collecting plate and the upper side or the lower side of the air-water heat exchange device; one end of the water outlet is connected to the inlet of the buried pipeline, and the other end thereof is respectively connected to the internal water channel of the heat collecting plate and the lower side or the upper side of the air-water heat exchange device.

[0008] A further improvement of the technical solution of the present utility model is that the water inlet circuit includes a water inlet pipe 1, one end of which is connected to the outlet of the buried pipeline and the other end passes through the top of the box and is connected to the upper side of the air-water heat exchange device; and a water inlet pipe 2, one end of which is connected to the pipe body of the water inlet pipe 1 and the other end is connected to the upper side of the water circuit inside the heat collecting plate.

[0009] A further improvement of the technical solution of the present utility model is that the water outlet path includes a water outlet pipe 1, one end of which is connected to the inlet of the buried pipeline and the other end passes through the bottom of the box and is connected to the lower side of the air-water heat exchange device; and a water outlet pipe 2, one end of which is connected to the pipe body of the water outlet pipe 1 and the other end is connected to the lower side of the water path inside the heat collecting plate.

[0010] A further improvement of the technical solution of the present invention is that the internal water channel of the heat collecting plate includes flow cavities vertically opened on the left and right sides of the heat collecting plate and a plurality of horizontal flow channels evenly arranged along the height direction of the heat collecting plate and connected with the two flow cavities.

[0011] A further improvement of the technical solution of the present utility model is that: the second water inlet pipe is connected to the upper end of the flow cavity on one side of the heat collecting plate, and the second water outlet pipe is connected to the lower end of the flow cavity on the other side of the heat collecting plate, and the ends of the two flow cavities that are not connected to the second water inlet pipe or the second water outlet pipe are both in a blocked state.

[0012] A further improvement of the technical solution of the present utility model is that: the outer wall of the heat collecting plate is coated with a heat absorbing paint, including a dark heat absorbing paint or a metal oxide composite heat absorbing paint.

[0013] A further improvement of the technical solution of the present invention is that a fan is installed on the air outlet of the collector, a grid plate is installed on the air inlet thereof, and an air-water heat exchange device is arranged between the fan and the grid plate.

[0014] Due to the adoption of the above technical solution, the technical progress achieved by the present invention is:

[0015] The purpose of the utility model is to provide a heat collection device for a greenhouse, which combines solar heat collection with waste heat recovery to fully utilize the energy in the air and sunlight with higher temperatures during the day, provide temperature compensation for the greenhouse at night to ensure the temperature required for crop growth, improve the energy utilization efficiency in the greenhouse and reduce the energy consumption of the greenhouse.

[0016] The utility model adopts the parallel arrangement of the internal water channel of the heat collecting plate and the air-water heat exchange device, both of which are connected to the buried pipes of the greenhouse through the same set of water inlet and outlet channels, making the pipeline layout more compact. The heat collecting plate and the air-water heat exchange device work together to make the collection and distribution of heat energy more efficient, thereby improving the energy utilization efficiency of the entire greenhouse and reducing the loss of heat during the transmission process.

[0017] The heat collecting plate used in the present invention is tiltedly arranged on the side of the box facing the greenhouse lighting surface and is paved with a water channel inside, which can effectively improve the solar energy absorption efficiency and quickly heat up the heat storage medium in the internal water channel. The outer wall of the heat collecting plate is coated with heat-absorbing paint, including dark heat-absorbing paint or metal oxide composite heat-absorbing paint, which can further improve the solar energy absorption efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the internal structure of the heat collecting device of the utility model;

[0019] Figure 2 This is a schematic diagram of the external structure of the heat collecting device of the utility model;

[0020] Figure 3 It is a side view schematic diagram of the fan side of the heat collecting device of the utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the water channel inside the heat collecting plate in the heat collecting device of the present invention;

[0022] Figure 5 It is a cross-sectional schematic diagram of each horizontal flow channel of the heat collecting plate in the heat collecting device of the present invention;

[0023] Among them, 1. Box body, 2. Grid plate, 3. Fan, 4. Air-water heat exchange device, 5. Heat collecting plate, 5-1. Flow cavity, 5-2. Horizontal flow channel, 6. Water inlet pipe 1, 7. Water outlet pipe 1, 8. Water inlet pipe 2, 9. Water outlet pipe 2. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below with reference to the embodiments:

[0025] like Figure 1-Figure 3 As shown, the utility model provides a heat collecting device for a greenhouse, including a heat collector located above the interior of the greenhouse. Specifically, the heat collector includes a box body 1, an air-water heat exchange device 4 and a heat collecting plate 5. An air inlet and an air outlet are respectively provided on the left and right sides of the box body 1. The air-water heat exchange device 4 is arranged inside the box body 1, and the heat collecting plate 5 is inclined to be arranged on the side of the box body 1 facing the lighting surface of the greenhouse, and a water channel is laid inside the heat collecting plate 5. An underground pipeline for heating crops is provided at the bottom of the interior of the greenhouse. The internal water channel of the heat collecting plate 5 and the air-water heat exchange device 4 are arranged in parallel, and both are connected to the underground pipeline of the greenhouse through the same set of water inlet and outlet, that is, the air-water heat exchange device 4 and the internal water channel of the heat collecting plate 5 share the same set of water inlet and outlet. In order to facilitate the circulation of the heat storage medium between the air-water heat exchange device 4, the heat collecting plate 5 and the buried pipeline, a circulating water pump is provided on the water inlet or outlet, and the heat storage medium can be water. Among them, the outer wall of the heat collecting plate 5 is coated with a heat-absorbing paint to better utilize solar energy, enhance the solar energy heat collection efficiency, and convert solar energy into the internal energy of the heat storage medium. The heat-absorbing paint includes a dark heat-absorbing paint or a metal oxide composite heat-absorbing paint. In order to better utilize the air heat in the greenhouse, a fan 3 is installed on the air outlet of the collector, and a mesh grille plate 2 is installed on its air inlet. The air-water heat exchange device 4 is arranged between the fan 3 and the mesh grille plate 2.

[0026] In order to optimize the pipeline layout and improve the heat exchange efficiency, one end of the water inlet is connected to the outlet of the buried pipeline, and the other end is connected to the internal water channel of the heat collecting plate 5 and the upper side or lower side of the air-water heat exchange device 4 respectively; one end of the water outlet is connected to the inlet of the buried pipeline, and the other end is connected to the internal water channel of the heat collecting plate 5 and the lower side or upper side of the air-water heat exchange device 4 respectively, that is, when one end of the water inlet is connected to the outlet of the buried pipeline, and the other end is connected to the internal water channel of the heat collecting plate 5 and the upper side of the air-water heat exchange device 4 respectively, one end of the water outlet is connected to the inlet of the buried pipeline, and the other end is connected to the internal water channel of the heat collecting plate 5 and the lower side of the air-water heat exchange device 4 respectively, and vice versa, thereby forming a circulating water exchange circuit. The connection position of the water inlet and the water outlet can be set according to usage requirements.

[0027] Furthermore, the water inlet circuit includes water inlet pipe 1 6 and water inlet pipe 2 8 , wherein one end of water inlet pipe 1 6 is connected to the outlet of the underground pipeline, and the other end thereof passes through the top of the housing 1 and is connected to the upper side of the air-water heat exchange device 4 . One end of water inlet pipe 2 8 is connected to the pipe body of water inlet pipe 1 6 , and the other end thereof is connected to the upper side of the waterway inside the heat collector 5 . The water outlet circuit includes water outlet pipe 1 7 and water outlet pipe 2 9 . One end of water outlet pipe 1 7 is connected to the inlet of the underground pipeline, and the other end thereof passes through the bottom of the housing 1 and is connected to the lower side of the air-water heat exchange device 4 . One end of water outlet pipe 2 9 is connected to the pipe body of water outlet pipe 1 7 , and the other end thereof is connected to the lower side of the waterway inside the heat collector 5 . That is, water inlet pipe 1 6 and water outlet pipe 1 7 adapted to the air-water heat exchange device 4 are the main pipes, and water inlet pipe 2 8 and water outlet pipe 2 9 adapted to the heat collector 5 are the branch pipes.

[0028] Furthermore, Figure 4 and Figure 5 As shown, the internal waterway of the heat collector plate 5 includes two flow chambers 5-1 and several horizontal flow channels 5-2. The two flow chambers 5-1 are vertically arranged on the left and right sides of the heat collector plate 5, respectively. The several horizontal flow channels 5-2 are evenly arranged along the height of the heat collector plate 5 and communicate with the two flow chambers 5-1. Preferably, the horizontal flow channels 5-2 are closely spaced. The second inlet pipe 8 is connected to the upper end of the flow chamber 5-1 on one side of the heat collector plate 5. Correspondingly, the second outlet pipe 9 is connected to the lower end of the flow chamber 5-1 on the other side of the heat collector plate 5. The ends of the two flow chambers 5-1 not connected to the second inlet pipe 8 or the second outlet pipe 9 are both blocked.

[0029] During heat collection, the heat storage medium in the underground pipeline enters the internal water path of the air-water heat exchange device 4 and the heat collecting plate 5 through the water inlet pipe 1 6 and the water inlet pipe 2 8 of the water inlet path respectively. The heat collecting plate 5 is exposed to the sun and converts the solar energy into the internal energy of the heat storage medium to increase its temperature. At the same time, the air-water heat exchange device 4 converts the heat of the air in the greenhouse into the internal energy of the heat storage medium to increase its temperature. Then the heat storage medium that has undergone heat exchange in the air-water heat exchange device 4 and the heat collecting plate 5 enters the underground pipeline through the water outlet pipe 1 7 and the water outlet pipe 2 9 of the water outlet path respectively. In this way, the waste heat recovery in the greenhouse and the utilization of solar energy are coordinated to increase the temperature of the soil and ensure the temperature required for crop growth.

[0030] It is understood that the present invention is described by way of certain embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. Furthermore, under the guidance of the present invention, these features and embodiments may be modified to suit specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be protected by the present invention.

Claims

1. A heat collecting device for a greenhouse, characterized by: The invention comprises a heat collector located above the interior of a greenhouse; the heat collector comprises a box body (1) with air inlets and air outlets respectively provided on the left and right sides, an air-water heat exchange device (4) provided inside the box body (1), and a heat collecting plate (5) obliquely provided on the side of the box body (1) facing the daylighting surface of the greenhouse and provided with a waterway inside. An underground pipeline for heating crops is provided below the interior of the greenhouse. The internal waterway of the heat collecting plate (5) and the air-water heat exchange device (4) are provided in parallel, and both are connected to the underground pipeline of the greenhouse through the same set of water inlet and outlet, and a circulating water pump is provided on the water inlet or outlet.

2. A heat collecting device for a greenhouse according to claim 1, characterized in that: One end of the water inlet is connected to the outlet of the buried pipeline, and the other end thereof is respectively connected to the internal water path of the heat collecting plate (5) and the upper side or lower side of the air-water heat exchange device (4); one end of the water outlet is connected to the inlet of the buried pipeline, and the other end thereof is respectively connected to the internal water path of the heat collecting plate (5) and the lower side or upper side of the air-water heat exchange device (4).

3. A heat collecting device for a greenhouse according to claim 2, characterized in that: The water inlet path includes a water inlet pipe 1 (6) having one end connected to the outlet of the buried pipeline and the other end penetrating the top of the box (1) and connected to the upper side of the air-water heat exchange device (4); and a water inlet pipe 2 (8) having one end connected to the pipe body of the water inlet pipe 1 (6) and the other end connected to the upper side of the water path inside the heat collecting plate (5).

4. A heat collecting device for a greenhouse according to claim 3, characterized in that: The water outlet comprises a water outlet pipe 1 (7) having one end connected to the inlet of the buried pipeline and the other end penetrating the bottom of the box (1) and connected to the lower side of the air-water heat exchange device (4); and a water outlet pipe 2 (9) having one end connected to the pipe body of the water outlet pipe 1 (7) and the other end connected to the lower side of the water channel inside the heat collecting plate (5).

5. A heat collecting device for a greenhouse according to claim 4, characterized in that: The internal water channel of the heat collecting plate (5) comprises flow cavities (5-1) vertically opened on the left and right sides of the heat collecting plate (5), and a plurality of horizontal flow channels (5-2) evenly arranged along the height direction of the heat collecting plate (5) and connected to the two flow cavities (5-1).

6. A heat collecting device for a greenhouse according to claim 5, characterized in that: The second water inlet pipe (8) is connected to the upper end of the flow cavity (5-1) on one side of the heat collecting plate (5), and the second water outlet pipe (9) is connected to the lower end of the flow cavity (5-1) on the other side of the heat collecting plate (5), wherein the ends of the two flow cavities (5-1) that are not connected to the second water inlet pipe (8) or the second water outlet pipe (9) are both in a blocked state.

7. A heat collecting device for a greenhouse according to any one of claims 1 to 6, characterized in that: The outer wall of the heat collecting plate (5) is coated with a heat absorbing paint, including a dark heat absorbing paint or a metal oxide composite heat absorbing paint.

8. The heat collecting device for a greenhouse according to claim 7, characterized in that: A fan (3) is installed on the air outlet of the heat collector, a grid plate (2) is installed on the air inlet thereof, and an air-water heat exchange device (4) is arranged between the fan (3) and the grid plate (2).

Images