Temperature regulating device for high-wire strawberry production in a solarium

Abstract

The utility model relates to the technical field of sunlight greenhouse strawberry planting, specifically relates to a temperature regulating device for sunlight greenhouse elevated strawberry planting, including the supplementary heating device of adaptation to elevated planting groove, supplementary heating device includes circulating water tank and heat exchange pipe subassembly, and circulating water tank is arranged in one side of elevated planting groove, and is provided with heating component and power component in circulating water tank, and heat exchange pipe subassembly is buried in planting medium of elevated planting groove, and one end of heat exchange pipe subassembly is connected with the water outlet of circulating water tank, and the other end is connected with the water inlet of circulating water tank, supplementary heating device is configured to utilize heating component to heat the water body in circulating water tank, and utilizes power component to pump into circulating water flow to heat exchange pipe subassembly, exchanges heat with the rhizosphere of plant through heat exchange pipe subassembly, forms temperature compensation, realizes the accurate temperature compensation of elevated strawberry rhizosphere area, stabilizes the rhizosphere temperature, equalizes the temperature of different areas of greenhouse, and further guarantees the normal growth of strawberry, reduces the plant frost injury and absolute yield risk.

Description

Technical Field

[0001] This utility model relates to the field of greenhouse strawberry cultivation technology, specifically to a temperature regulation device for elevated strawberry cultivation in greenhouses. Background Technology

[0002] During the day, solar greenhouses rely on solar radiation to store heat, and at night, they dissipate heat through the greenhouse film to supplement the indoor temperature. On cloudy or rainy days, when there is no solar radiation, the temperature inside the greenhouse drops continuously at night, easily falling below the critical value for strawberry growth. In particular, northern regions may experience strong cold waves in winter or early spring, causing the greenhouse temperature to drop below the critical value in a short period, leading to frost damage to strawberry leaves and root necrosis. Further supplemental heating measures are needed to prevent plant death from frost damage and reduce the risk of total crop failure.

[0003] In elevated strawberry cultivation, the cultivation substrate is laid on trellises, isolating it from the ground. Compared to ground cultivation, where the soil acts as a heat buffer layer, storing heat during the day and slowly releasing it at night, the elevated substrate lacks the thermal conductivity of soil. Furthermore, the trellises are highly conductive, causing the substrate heat to be rapidly conducted to the air inside the greenhouse at night, where it is then dissipated. This results in the root zone temperature of the strawberry plants being 3-5°C lower than that of ground cultivation.

[0004] Currently, in response to the disadvantages of supplemental heating caused by elevated strawberry cultivation, the structure of the back wall of the solar greenhouse has been further optimized. For example, the inner wall uses materials with a higher heat absorption coefficient, and the outer wall uses materials with better heat insulation performance to improve the heat storage capacity of the back wall, thereby ensuring the temperature of the greenhouse at night.

[0005] However, the heat storage capacity of the back wall depends entirely on the intensity of solar radiation during the day. It needs to absorb heat through sunlight during the day and store it inside the wall, then slowly release it at night through heat conduction and radiation. If there are consecutive cloudy days or insufficient sunshine in winter, the total amount of heat absorbed by the back wall during the day will be insufficient, and the heat release at night will be short-lived, causing the temperature inside the greenhouse to drop rapidly to a critical value in the latter half of the night. Furthermore, the heat release from the back wall exhibits a gradient decay pattern, with heat gradually decreasing from the back wall towards the front of the greenhouse. This leads to significant temperature differences in different areas inside the greenhouse. Since elevated strawberries typically use a multi-row cultivation trough layout, this further amplifies the problem of uneven temperature distribution, making it difficult to meet the nighttime temperature compensation requirements for elevated strawberry cultivation in solar greenhouses. Summary of the Invention

[0006] The purpose of this invention is to provide a temperature regulation device for the process of cultivating elevated strawberries in a solar greenhouse, so as to achieve precise temperature supplementation in the root zone of the elevated strawberry, stabilize the root zone temperature, balance the temperature in different areas of the greenhouse, thereby ensuring the normal growth of strawberries and reducing the risk of frost damage and crop failure.

[0007] To achieve the above objectives, this utility model proposes a temperature regulation device for elevated strawberry cultivation in a solar greenhouse, including an auxiliary heating device adapted to the elevated planting trough. The auxiliary heating device includes a circulating water tank and a heat exchange tube assembly. The circulating water tank is located on one side of the elevated planting trough. The circulating water tank is equipped with heating components and power components. The heat exchange tube assembly is buried in the planting substrate of the elevated planting trough. One end of the heat exchange tube assembly is connected to the outlet of the circulating water tank, and the other end is connected to the inlet of the circulating water tank. The auxiliary heating device is configured to heat the water in the circulating water tank using a heating component and to pump circulating water into the heat exchange tube assembly using a power component. The heat exchange tube assembly exchanges heat with the plant roots to achieve temperature compensation.

[0008] Preferably, the temperature control device for elevated strawberry cultivation in a solar greenhouse also includes an electric heating component installed on the side wall of the elevated planting trough. The electric heating component is configured to heat the planting substrate through thermal radiation and thermal conduction using an electric heating plate.

[0009] Preferably, multiple electric heating plates are arranged in a linear array along the longitudinal direction of the elevated planting trough.

[0010] Preferably, the heat exchanger assembly includes a main pipe and multiple branch heat exchanger pipes, which are embedded in the planting substrate in a serpentine pattern.

[0011] Preferably, the outer side of the electric heating plate is covered with an insulation layer.

[0012] Preferably, the temperature regulation device for elevated strawberry cultivation in a solar greenhouse also includes a temperature monitoring component, which includes multiple temperature sensors embedded in the planting substrate. Each temperature sensor is evenly distributed along the length of the elevated planting trough, and the temperature sensors are electrically connected to the control terminal of the heating component of the circulating water tank.

[0013] As a preferred option, the power component is a variable frequency water pump, and a flow sensor is installed at the outlet of the variable frequency water pump. The flow sensor is electrically connected to the control module of the variable frequency water pump to realize dynamic adjustment of the water flow rate.

[0014] Preferably, the heating element is an electric heating rod.

[0015] Compared with existing technologies, the temperature regulation device for elevated strawberry cultivation in solar greenhouses provided by this utility model has the following substantial features and advancements: This temperature regulation device for elevated strawberry cultivation in solar greenhouses embeds the heat exchange tube assembly of the auxiliary heating device adapted to the elevated planting trough into the planting substrate, and uses a circulating water tank to heat and pump circulating water. This achieves precise temperature supplementation in the rhizosphere region, ensuring the activity of strawberry roots and their core growth needs. It also stabilizes the rhizosphere temperature, balances the temperature in different areas of the greenhouse, optimizes the overall planting environment, and effectively reduces the risk of frost damage and crop failure, thereby improving the stability of planting returns. Furthermore, its structural design, adapted to elevated planting scenarios, requires no large-scale modification of existing facilities, possesses good practicality and adaptability, and is easy to promote and apply. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural schematic diagram of a temperature regulation device for elevated strawberry cultivation in a solar greenhouse, as described in this utility model embodiment.

[0017] Figure 2 yes Figure 1 The main view.

[0018] Figure 3 yes Figure 2 Top view.

[0019] Figure 4 This is a reference diagram showing the usage status of the heat exchange tube assembly and electric heating plate in the planting substrate in this utility model embodiment.

[0020] Figure 5 This is a schematic diagram of the internal structure of the circulating water tank in an embodiment of this utility model.

[0021] Attached reference numerals: 1. Elevated planting trough; 2. Circulating water tank; 3. Heat exchanger tube assembly; 4. Electric heating plate; 5. Power unit; 6. Heating unit; 7. Planting substrate; 31. Main pipe; 32. Branch heat exchanger tube. Detailed Implementation

[0022] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0023] like Figures 1-5 As shown in the figure, this utility model embodiment proposes a temperature regulation device for elevated strawberry cultivation in a solar greenhouse, including an auxiliary heating device adapted to the elevated planting trough 1.

[0024] like Figure 5 As shown, the auxiliary heating device includes a circulating water tank 2 and a heat exchange tube assembly 3. The circulating water tank 2 is located on one side of the elevated planting trough 1, and a heating element 6 and a power element 5 are installed inside the circulating water tank 2. Figure 2 and Figure 3As shown, the heat exchange tube assembly 3 is buried in the planting substrate 7 of the elevated planting trough 1. One end of the heat exchange tube assembly 3 is connected to the outlet of the circulating water tank 2, and the other end is connected to the inlet of the circulating water tank 2.

[0025] The auxiliary heating device is configured to heat the water in the circulating water tank 2 using the heating element 6, and to pump circulating water into the heat exchange tube assembly 3 using the power element 5. The circulating water exchanges heat with the plant roots through the heat exchange tube assembly 3, thus forming temperature compensation.

[0026] Therefore, the rhizosphere temperature of strawberries is a key factor affecting the absorption of nutrients and water by the roots, thus determining the plant's growth status. The device, by directly burying the heat exchange pipe assembly 3 in the planting substrate 7 of the elevated planting trough 1, allows heated circulating water to directly exchange heat with the rhizosphere area, achieving targeted heating. Compared to traditional greenhouse overall heating methods, this design can precisely deliver heat to the core growth area of ​​strawberries, avoiding heat waste in non-critical areas, ensuring that the rhizosphere temperature remains stable within the suitable range for strawberry growth, providing a solid guarantee for maintaining root activity and improving nutrient absorption efficiency, and promoting normal strawberry development from the source of growth.

[0027] The circulating water tank 2 in the device is equipped with a heating element 6 and a power element 5, which can continuously provide stable heat to the circulating water flow and ensure the efficiency of water circulation. When the external temperature fluctuates or the internal temperature of the greenhouse drops, the circulating water flow can continuously release heat to the rhizosphere substrate, effectively resisting the impact of low temperature on the rhizosphere and avoiding root damage caused by sudden rises and falls in rhizosphere temperature, thus creating a stable microenvironment for strawberry growth.

[0028] Traditional greenhouses are prone to significant temperature differences between different areas due to factors such as spatial layout and light distribution, leading to inconsistent strawberry growth within the same greenhouse. This device, by adapting an auxiliary heating unit to the elevated planting trough 1, allows for flexible placement of heat exchange pipe components 3 according to the temperature requirements of different areas within the greenhouse. Utilizing the heat transfer through circulating water, it balances temperature differences between areas, resulting in a more uniform overall temperature distribution within the greenhouse. This ensures all strawberry plants are in a uniformly suitable growing environment, improving the uniformity of planting.

[0029] Especially in elevated planting, the root zone is more susceptible to changes in external temperature. This device, through precise heating and temperature stabilization, can provide continuous heat protection for the strawberry root zone in cold weather, preventing the roots from losing their absorption function due to frost damage, and thus preventing the plants from wilting and dying.

[0030] The auxiliary heating device, serving as the core temperature control component, includes a circulating water tank 2 and a heat exchange tube assembly 3. The circulating water tank 2 is made of 304 stainless steel, has a volume of 50L, and is fixedly installed on the north side (non-sunlight side) of the elevated planting trough 1 to avoid blocking sunlight. The circulating water tank 2 contains a heating element 6 and a power unit 5. The heating element 6 is a 2kW electric heating rod, vertically installed at the bottom of the tank, with an anti-corrosion treatment on its surface. The power unit 5 is a TDB-32 variable frequency water pump, installed at the water outlet of the tank, with a rated flow rate of 1.5m³ / h.

[0031] The heat exchanger assembly 3 is embedded in the planting substrate 7 of the elevated planting trough 1. This assembly includes a main pipe 31 and six branch heat exchanger pipes 32. The main pipe 31 is a 32mm diameter PPR pipe, and the branch heat exchanger pipes 32 are 20mm diameter PERT underfloor heating pipes. Each branch heat exchanger pipe 32 is arranged in a continuous serpentine pattern along the length of the planting trough, with a spacing of 30cm between adjacent serpentine sections to ensure uniform heat distribution. The inlet end of the branch heat exchanger pipe 32 is connected to the main pipe 31 through a water collector, and the other end of the main pipe 31 is connected to the outlet of the circulating water tank 2. The outlet end of the branch heat exchanger pipe 32 is collected by a water distributor and then connected to the inlet of the circulating water tank 2 through a return pipe, forming a complete water circulation path.

[0032] To enhance the heating effect, the device also includes electric heating components installed on both sides of the elevated planting trough 1. The electric heating components are 5mm thick silicone rubber heating plates 4, each measuring 30cm × 10cm, with a rated power of 150W. Multiple heating plates 4 are arranged in a linear array along the longitudinal direction of the elevated planting trough 1, with a spacing of 50cm between adjacent heating plates 4. The outer side of each heating plate 4 is covered with a 3cm thick polyurethane insulation layer to reduce heat loss to the external environment. The heating plates 4 directly heat both sides of the planting substrate 7 through thermal radiation and heat conduction, forming a three-dimensional heating network with the heat exchange tube assembly 3.

[0033] The temperature monitoring component includes eight DS18B20 digital temperature sensors, evenly distributed along the length of the elevated planting trough 1 and buried in the substrate at the same depth as the heat exchange tube assembly 3, with each sensor spaced 1.5m apart. All temperature sensors are connected to an STM32F103 control chip via signal lines. This control chip is electrically connected to the control terminal of the electric heating rod in the circulating water tank 2 and the relay of the electric heating assembly, enabling automatic temperature control. When the sensors detect a substrate temperature below 15℃ (the lower limit of the suitable temperature for strawberry roots), the control module activates the heating element 6; heating automatically stops when the temperature reaches 22℃.

[0034] A turbine flow sensor, model LWGY-15, is also installed at the outlet of the variable frequency water pump. This flow sensor is electrically connected to the control module of the variable frequency water pump and can monitor the circulating water flow in real time. When the flow rate is lower than 0.8 m³ / h, the control module automatically increases the pump frequency to increase the flow rate; when the flow rate is higher than 1.2 m³ / h, the pump frequency is reduced to reduce energy consumption, thus achieving dynamic adjustment of the water flow rate.

[0035] The working process of this embodiment is as follows: When the temperature monitoring component detects that the temperature of the planting substrate 7 is lower than the set threshold, the control unit simultaneously activates the electric heating rod and the electric heating component. The electric heating rod heats the water in the circulating water tank 2, and the heated hot water enters the heat exchange tube assembly 3 under the drive of the variable frequency water pump, exchanging heat with the substrate around the strawberry roots through the branch heat exchange tubes 32; at the same time, the electric heating plates 4 on both sides provide auxiliary heating to the substrate through thermal radiation and thermal conduction. The circulated cold water flows back to the circulating water tank 2 for reheating, forming continuous temperature compensation. When the substrate temperature reaches a suitable range, each heating component 6 automatically stops working, thereby achieving precise and efficient control of the temperature of the strawberry root environment.

[0036] This utility model is not limited to the specific technical solutions described in the above embodiments. Besides the above embodiments, this utility model may have other implementation methods. For those skilled in the art, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A temperature regulating device for high-wire strawberry production in a solarium, characterized in that, Includes an auxiliary heating device adapted to the elevated planting trough (1); The auxiliary heating device includes a circulating water tank (2) and a heat exchange tube assembly (3). The circulating water tank (2) is arranged on one side of the elevated planting trough (1). The circulating water tank (2) is equipped with a heating component (6) and a power component (5). The heat exchange tube assembly (3) is buried in the planting substrate (7) of the elevated planting trough (1). One end of the heat exchange tube assembly (3) is connected to the outlet of the circulating water tank (2), and the other end is connected to the inlet of the circulating water tank (2). The auxiliary heating device is configured to heat the water in the circulating water tank (2) using a heating component (6) and to pump circulating water into the heat exchange tube assembly (3) using a power component (5), so that heat exchange can be carried out between the heat exchange tube assembly (3) and the plant root zone to form temperature compensation.

2. Temperature regulating device for high-wire strawberry production in a sun- greenhouse according to claim 1, characterized in that It also includes an electric heating component installed on the side wall of the elevated planting trough (1), the electric heating component being configured to heat the planting substrate (7) by means of electric heating plate (4) through thermal radiation and thermal conduction.

3. Temperature regulating device for high-wire strawberry production in a sun- greenhouse according to claim 2, characterized in that Multiple electric heating plates (4) are arranged in a linear array along the longitudinal direction of the elevated planting trough (1).

4. The temperature regulating device for high-wire strawberry production in a solarium according to claim 1, characterized in that, The heat exchange tube assembly (3) includes a main pipe (31) and multiple branch heat exchange tubes (32), which are embedded in the planting substrate (7) in a serpentine manner.

5. The temperature control device for elevated strawberry cultivation in a solar greenhouse according to claim 2, characterized in that, The outer side of the electric heating plate (4) is covered with an insulation layer.

6. The temperature control device for elevated strawberry cultivation in a solar greenhouse according to claim 1, characterized in that, It also includes a temperature monitoring component, which includes multiple temperature sensors embedded in the planting substrate (7). Each temperature sensor is evenly distributed along the length of the elevated planting trough (1), and the temperature sensors are electrically connected to the control terminal of the heating component (6) of the circulating water tank (2).

7. The temperature control device for elevated strawberry cultivation in a solar greenhouse according to claim 1, characterized in that, The power component (5) is a variable frequency water pump. A flow sensor is installed at the outlet of the variable frequency water pump. The flow sensor is electrically connected to the control module of the variable frequency water pump to realize dynamic adjustment of the water flow speed.

8. The temperature control device for elevated strawberry cultivation in a solar greenhouse according to claim 1, characterized in that, The heating element (6) is an electric heating rod.

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