Temperature control device for photosynthetic fluorescence measurement system

Abstract

The present invention relates to a temperature control device for a photosynthetic fluorescence measurement system, comprising a hollow metal shell sleeved on the outer side of a leaf chamber of the photosynthetic fluorescence measurement system and a compression temperature control device connected to the hollow metal shell, wherein the compression temperature control device is connected to a circulation pipeline, the interior of the circulation pipeline is filled with water-cooling liquid, and the circulation pipeline is simultaneously connected to the hollow metal shell; a control module is also included, which is used to obtain a target temperature set by a user and the current temperature of the water-cooling liquid in the circulation pipeline; and a control strategy is generated based on the target temperature and the current temperature; the compression temperature control device is used to adjust the temperature of the water-cooling liquid in the circulation pipeline based on the control strategy, so that the temperature of the water-cooling liquid is transferred to the hollow metal shell. The present application has the function of realizing accurate control of the temperature of the leaf chamber of the photosynthetic fluorescence measurement system, and improves the range of controlling the temperature of the leaf chamber, so that the photosynthetic fluorescence measurement system can accurately measure the photosynthetic rate and fluorescence parameters at different experimental temperatures.

Description

Technical Field

[0001] The invention relates to a field monitoring technology of plant physiological and ecological parameters in the field of environmental monitoring, and in particular to a temperature control device of a photosynthetic fluorescence measurement system. Background Art

[0002] As the importance of global climate change and ecosystem stability becomes increasingly prominent, the photosynthesis process of plants has become a hot topic in scientific research. As the core process of plant energy conversion and carbon cycle, photosynthesis is not only related to the growth and development of plants themselves, but also plays a decisive role in maintaining the carbon-oxygen balance in the atmosphere and promoting the carbon cycle of terrestrial ecosystems. Therefore, a deep understanding of the mechanism and regulation process of plant photosynthesis is of great significance for revealing the laws of ecosystem carbon cycle, predicting climate change trends, and guiding agricultural production practices.

[0003] In the study of photosynthesis, accurate measurement of plant leaf photosynthetic rate and chlorophyll fluorescence parameters is the key to obtaining plant physiological and ecological information. At present, portable photosynthetic fluorescence measurement systems (such as LI-6800) based on infrared CO2 gas analysis have become the mainstream tools for field measurements. This system can reflect the photosynthetic state of plants non-destructively, directly and quickly by measuring the gas exchange and fluorescence parameters of leaves under different environmental conditions.

[0004] However, in practical applications, the temperature control range of the photosynthetic fluorescence measurement system is limited by the ambient temperature, which makes it difficult to meet the in-depth study of plant photosynthesis under extreme temperature conditions. Especially when the temperature gradient is large or the ambient temperature is extreme, the temperature control module of the photosynthetic fluorescence measurement system often cannot achieve accurate control of the leaf chamber temperature, which not only affects the accuracy and reliability of the experimental data, but also limits its application in long-term field observations. Therefore, there is an urgent need for a temperature control device that can quickly and accurately control the temperature in the observation leaf chamber of the photosynthetic fluorescence measurement system. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a temperature control device and a control method for a photosynthetic fluorescence measurement system, aiming to solve at least one of the above technical problems.

[0006] The technical solution of the present invention to solve the above technical problems is as follows:

[0007] The present application provides a temperature control device for a photosynthetic fluorescence measurement system, which adopts the following technical solution:

[0008] A temperature control device for a photosynthetic fluorescence measurement system comprises a hollow metal shell sleeved on the outer side of a leaf chamber of the photosynthetic fluorescence measurement system and a compression temperature control device connected to the hollow metal shell, wherein the compression temperature control device is connected to a circulation pipeline, the circulation pipeline is filled with water cooling liquid, and the circulation pipeline is also connected to the hollow metal shell;

[0009] It also includes a control module, which is used to obtain a target temperature set by a user and a current temperature of the water-cooling liquid in the circulation pipeline; and generate a control strategy based on the target temperature and the current temperature;

[0010] The compression temperature control device is used to adjust the temperature of the water-cooling liquid in the circulation pipeline based on the control strategy so that the temperature of the water-cooling liquid is transferred to the hollow metal shell.

[0011] The beneficial effects of the present invention are as follows: the temperature control range of the photosynthetic fluorescence measurement system is limited by the ambient temperature, which makes it difficult to meet the in-depth study of plant photosynthesis under extreme temperature conditions. The control module of the present invention can generate an accurate control strategy through the target temperature set by the user and the current temperature of the water-cooling liquid in the circulation pipeline. The compression temperature control device can quickly adjust the temperature of the water-cooling liquid in the circulation pipeline according to the control strategy, and then quickly change the temperature of the hollow metal shell, ensuring that the temperature of the leaf chamber of the photosynthetic fluorescence measurement system can quickly respond and reach the set target temperature, and realize accurate control of the leaf chamber temperature, so as to solve the temperature range control limitation of the instrument measurement in the prior art. Thereby assisting the field measurement work of the portable photosynthetic fluorescence measurement system, so that it can accurately measure the photosynthetic rate and fluorescence parameters under different experimental temperatures.

[0012] Based on the above technical solution, the present invention can also be improved as follows.

[0013] Furthermore, the hollow metal shell includes an upper metal shell of a blade chamber, a lower metal shell of a first blade chamber, a lower metal shell of a second blade chamber and a gas path metal shell. A first liquid cooling circuit is provided inside the upper metal shell of the blade chamber, and a second liquid cooling circuit is provided inside the lower metal shell of the first blade chamber. Both the first liquid cooling circuit and the second liquid cooling circuit are connected to the circulation pipeline.

[0014] The beneficial effect of adopting the above-mentioned further scheme is: by respectively arranging liquid cooling circuits inside the upper metal shell of the leaf chamber and the lower metal shell of the first leaf chamber, water-cooling liquid circulates inside the liquid cooling circuit and is conducted to the metal shell. The water-cooling liquid can circulate inside these two areas, thereby exchanging heat with the upper half of the leaf chamber and the lower half of the leaf chamber, thereby achieving temperature control of the upper half and the lower half of the leaf chamber while ensuring that the upper and lower parts of the leaf chamber can be evenly cooled or heated, which helps to improve the uniformity of the temperature in the leaf chamber of the photosynthetic fluorescence measurement system, avoid local overheating or overcooling, and improve the accuracy and reliability of the temperature control of the leaf chamber.

[0015] Furthermore, a third liquid cooling circuit is provided inside the gas path metal shell, and the third liquid cooling circuit is connected to the circulation pipeline.

[0016] The beneficial effect of adopting the above further scheme is that since the leaf chamber of the photosynthetic fluorescence measurement system is adjusted by the temperature of the gas in and out of its gas path, a gas path metal shell is provided, which can tightly wrap the gas path pipe of the photosynthetic fluorescence measurement system, and a third liquid cooling circuit connected to the circulation pipeline is provided inside the gas path metal shell to achieve heat exchange with the gas in the gas path. It ensures that not only the outer part of the leaf chamber (i.e., the upper metal shell of the leaf chamber and the lower metal shell of the first leaf chamber) can be temperature controlled, but also the part of the gas path connected to the leaf chamber can be temperature controlled, thereby improving the efficiency of temperature adjustment inside the leaf chamber.

[0017] Further, the compression temperature control device includes a compressor, a fan and a heat exchanger arranged on one side of the compressor, and an oil pump, the oil pump and the heat exchanger are both connected to the circulation pipeline, and the compressor, the fan, the heat exchanger and the oil pump are all electrically connected to the control module;

[0018] The compressor is used to compress the refrigerant and transport the compressed refrigerant to the heat exchanger;

[0019] The fan is used to dissipate heat from the water-cooling liquid inside the compressor;

[0020] The heat exchanger is used to transfer the heat generated by the compressor to the water-cooling liquid, or absorb the heat of the water-cooling liquid;

[0021] The oil pump is used to drive the water-cooling liquid inside the circulation pipeline to circulate.

[0022] The beneficial effect of adopting the above further scheme is: through the precise control of the compressor, fan, heat exchanger and oil pump by the control module, the temperature of the water coolant can be accurately adjusted, thereby achieving precise control of the leaf chamber temperature of the photosynthetic fluorescence measurement system. The user only needs to set the target temperature through the control module, and the system can automatically complete the temperature adjustment and control work, simplifying the operation process.

[0023] When working, the oil pump starts, driving the water-cooling liquid inside the circulation pipe to circulate. At the same time, the compressor runs, compresses the refrigerant, and transmits the compressed refrigerant to the heat exchanger. Driven by the oil pump, the water-cooling liquid flows through the heat exchanger to exchange heat with the compressor, further changing the temperature of the water-cooling liquid in the heat exchanger. This achieves precise control of the water-cooling liquid temperature.

[0024] Furthermore, the circulation pipeline includes two first pipelines and second pipelines which are connected to the heat exchanger at the same time, and one end of the first pipeline away from the heat exchanger is connected to the first liquid cooling circuit of the upper metal shell of the blade chamber and the third liquid cooling circuit inside the metal shell of the gas path in sequence, and flows back to the heat exchanger;

[0025] One end of the second pipeline away from the heat exchanger is connected to the second liquid cooling circuit of the metal shell at the lower part of the first blade chamber and flows back to the heat exchanger.

[0026] The beneficial effect of adopting the above-mentioned further scheme is as follows: the water-cooling liquid starts from the heat exchanger, enters the pipeline connected to the first liquid-cooling circuit inside the upper metal shell of the blade chamber for heat exchange, and then enters the third liquid-cooling circuit inside the gas path metal shell to exchange heat with the internal gas path, and then flows into the heat exchanger to exchange heat with the compressor. The compressor transfers the temperature to the heat exchanger through the refrigerant, further changes the temperature of the water-cooling liquid in the heat exchanger and performs the next circulation; at the same time, the water-cooling liquid also enters the pipeline connected to the second liquid-cooling circuit inside the lower metal shell of the first blade chamber for heat exchange, and then flows into the heat exchanger to exchange heat with the compressor. The compressor transfers the temperature to the heat exchanger through the refrigerant, further changes the temperature of the water-cooling liquid in the heat exchanger and performs the next circulation, and finally delivers the temperature of the water-cooling liquid to the upper metal shell of the blade chamber, the lower metal shell of the first blade chamber and the gas path metal shell.

[0027] Furthermore, the compression temperature control device also includes a water tank, which is connected to the circulation pipeline and is used to store the water-cooling liquid. A temperature sensor is arranged inside the water tank, and the temperature sensor is connected to the control module.

[0028] The beneficial effect of adopting the above further solution is that the water tank provides a stable water-cooling liquid storage and supply for the device. Through the circulation pipeline, the water-cooling liquid can flow continuously and stably to ensure the continuous operation of the system. The temperature sensor set inside the water tank can monitor the temperature of the water-cooling liquid in real time and feed the data back to the control module, realizing the accuracy of the water-cooling liquid temperature monitoring inside the circulation pipeline.

[0029] Furthermore, the water tank is made of a transparent material or a translucent material.

[0030] The beneficial effect of adopting the above further solution is that the water tank made of transparent or translucent material allows the user to directly observe the state of the water coolant inside the water tank. By observing the state of the water coolant inside the water tank, the user can promptly discover abnormal conditions such as leakage, overheating, impurities and contamination.

[0031] Furthermore, the compression temperature control device also includes a battery, and the battery is electrically connected to the compressor, the fan, the heat exchanger, the oil pump and the control module respectively.

[0032] The beneficial effect of adopting the above further solution is: the compressor, fan, heat exchanger, etc. are powered by the battery, thereby improving the stability of the temperature control device of the photosynthetic fluorescence measurement system.

[0033] Furthermore, the circulation pipeline is a PVC pipeline, the compressor is a single-rotor silent compressor, the heat exchanger is a stainless steel heat exchanger, and the oil pump is a brushless oil pump.

[0034] The beneficial effects of adopting the above further solution are: PVC pipes are light and easy to install, reducing the time and cost of installation and replacement. The single-rotor silent compressor has high efficiency and can control temperature more quickly and accurately. The stainless steel heat exchanger has high thermal conductivity and can quickly and efficiently transfer heat, improving the efficiency of the temperature control device. The brushless oil pump has no brush friction loss when rotating, has high conversion efficiency, and has significant energy saving effect.

[0035] Furthermore, the outer side of the circulation pipe is covered with a heat-insulating sponge.

[0036] The beneficial effect of adopting the above further solution is that by arranging a thermal insulation sponge on the outside of the circulation pipe, heat loss can be effectively reduced, energy can be saved, and energy costs can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A structural block diagram of a temperature control device for a photosynthetic fluorescence measurement system provided by the present invention;

[0038] Figure 2 A schematic structural diagram showing the connection relationship of a temperature control device of a photosynthetic fluorescence measurement system provided by the present invention;

[0039] Figure 3 It is a schematic structural diagram of the metal shell on the upper part of the leaf chamber of the present invention;

[0040] Figure 4 It is a schematic structural diagram of the metal shell at the lower part of the first blade chamber of the present invention;

[0041] Figure 5 It is a schematic structural diagram of the metal shell at the lower part of the second blade chamber of the present invention;

[0042] Figure 6 It is a schematic diagram of the structure of the gas path metal housing of the present invention;

[0043] Figure 7 is a cross-sectional view of the gas path metal housing of the present invention;

[0044] Figure 8 A temperature control device of a photosynthetic fluorescence measurement system provided by the present invention embodies a control block diagram of a control module.

[0045] Figure numerals: 1. Upper metal shell of blade chamber; 2. Metal shell of gas path; 21. Third liquid cooling circuit; 3. Lower metal shell of first blade chamber; 4. Lower metal shell of second blade chamber; 5. Compressor; 6. Battery; 7. Heat exchanger; 8. Control module; 9. Oil pump; 10. Water tank; 11. Fan; 12. Temperature sensor; 13. First liquid cooling circuit; 14. Second liquid cooling circuit; 15. Compression temperature control device. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0047] The photosynthetic fluorescence measurement system mainly includes the host, analyzer head, cable connection line, gas pipe and leaf chamber, and adjusts the temperature of the leaf chamber by the temperature of the gas in and out of the gas pipe. The leaf chamber for fixed measurement samples is set at the head of the gas analyzer. The airflow is divided into the reference chamber and the sample chamber at the analyzer head. The photosynthetic rate and other parameters are measured by calculating the CO2 and H2O concentration difference before and after the airflow enters the leaf chamber.

[0048] The present application provides a temperature control device for a photosynthetic fluorescence measurement system, such as Figure 1 and Figure 2 As shown, a temperature control device for a photosynthetic fluorescence measurement system includes a hollow metal shell mounted on a leaf chamber and an air pipe of the photosynthetic fluorescence measurement system and a compression temperature control device 15 connected to the hollow metal shell. The compression temperature control device 15 is connected to a circulation pipeline, the interior of the circulation pipeline is filled with water-cooling liquid, and the circulation pipeline is also connected to the hollow metal shell.

[0049] The temperature control device also includes a control module 8, which is used to obtain the target temperature set by the user and the current temperature of the water-cooling liquid in the circulation pipeline, and generate a control strategy based on the target temperature and the current temperature; the compression temperature control device 15 is used to adjust the temperature of the water-cooling liquid in the circulation pipeline based on the control strategy so that the water-cooling liquid can obtain the temperature and be transferred to the hollow metal shell.

[0050] The control module 8 generates an accurate control strategy according to the target temperature set by the user and the current temperature of the water-cooling liquid in the circulation pipeline. The compression temperature control device 15 can quickly adjust the temperature of the water-cooling liquid in the circulation pipeline according to the control strategy, and then quickly change the temperature of the hollow metal shell, ensuring that the temperature of the leaf chamber of the photosynthetic fluorescence measurement system can respond quickly and reach the set target temperature, thereby achieving accurate control of the leaf chamber temperature and solving the temperature range control limitations of the instrument measurement in the prior art.

[0051] like Figures 2 to 7 As shown, the hollow metal shell includes an upper metal shell 1 of a blade chamber, a lower metal shell 3 of a first blade chamber, a lower metal shell 4 of a second blade chamber and an air path metal shell 2. The upper metal shell 1 of the blade chamber is provided with a first liquid cooling circuit 13, the lower metal shell 3 of the first blade chamber is provided with a second liquid cooling circuit 14, the water inlet and outlet of the first liquid cooling circuit 13 and the water inlet and outlet of the second liquid cooling circuit 14 are all connected to the circulation pipeline, and a third liquid cooling circuit 21 is opened inside the air path metal shell 2, and the water inlet and outlet of the third liquid cooling circuit 21 are both connected to the circulation pipeline.

[0052] In the embodiment of the present application, the circulation pipe adopts a PVC pipe and an insulating sponge is provided on the outer surface of the circulation pipe. The PVC pipe is light and easy to install, which reduces the time and cost of installation and replacement. By arranging the insulating sponge on the outer side of the circulation pipe, heat loss can be effectively reduced, energy can be saved, and energy costs can be reduced.

[0053] The inner side of the upper metal shell 1 of the leaf chamber is consistent with the shape of the upper outer side of the leaf chamber, so that the upper metal shell 1 of the leaf chamber is tightly wrapped to the upper side of the leaf chamber. The inner diameter of the first liquid cooling circuit 13 inside the upper metal shell 1 of the leaf chamber is 4mm, the water flow volume is 29mL, and the upper metal shell 1 of the leaf chamber can be tightly connected with the head of the leaf chamber analyzer. The water inlet and outlet of the first liquid cooling circuit 13 inside the upper metal shell 1 of the leaf chamber are both connected to the circulation pipeline, so that the water-cooling liquid can circulate in the first liquid cooling circuit 13, and the temperature of the water-cooling liquid can be transmitted to the upper metal shell 1 of the leaf chamber, so as to exchange heat with the upper part of the leaf chamber. By controlling the temperature of the water-cooling liquid in the circulation pipeline, the temperature control of the upper part of the leaf chamber is achieved, ensuring that the upper part of the leaf chamber can be evenly cooled or heated.

[0054] Connecting plates are extended on both sides of the first leaf chamber lower metal shell 3 and the second leaf chamber lower metal shell 4. The first leaf chamber lower metal shell 3 and the second leaf chamber lower metal shell 4 are respectively connected by bolts to connect the connecting plates on both sides, so that the first leaf chamber lower metal shell 3 and the second leaf chamber lower metal shell 4 are buckled together. The first leaf chamber lower metal shell 3 is fixed by the second leaf chamber lower metal shell 4, so that the whole formed by the first leaf chamber lower metal shell 3 and the second leaf chamber lower metal shell 4 is tightly fitted with the lower part of the leaf chamber. The inner diameter of the second liquid cooling circuit 14 opened in the lower metal shell 3 of the first blade chamber is 4mm, and the water flow volume is 18mL. The water inlet and outlet of the second liquid cooling circuit 14 of the lower metal shell 3 of the first blade chamber are connected to the circulation pipeline, so that the water-cooling liquid can circulate in the second liquid cooling circuit 14. The temperature of the water-cooling liquid can be transmitted to the lower metal shell 3 of the first blade chamber, thereby performing heat exchange with the lower part of the blade chamber. By controlling the temperature of the water-cooling liquid in the circulation pipeline, the temperature control of the lower part of the blade chamber is achieved, ensuring that the lower part of the blade chamber can be evenly cooled or heated.

[0055] The shape of the gas path metal shell 2 is a slotted cylinder. The inner diameter of the cylinder of the gas path metal shell 2 is 8 mm, the outer diameter is 25 mm, the length is 80 mm, and the water flow volume is 35 mL. The side wall of the groove of the gas path metal shell 2 is also provided with two limit grooves, and the limit grooves are used to fix the gas path pipe of the leaf chamber. By setting the gas path pipe of the photosynthetic fluorescence measurement system in the groove of the gas path metal shell 2, the gas path metal shell 2 wraps the gas path pipe of the photosynthetic fluorescence measurement system. The water inlet and the water outlet of the third liquid cooling circuit 21 inside the gas path metal shell 2 are both connected to the circulation pipeline, so that the water-cooling liquid circulates in the third liquid cooling circuit 21 inside the gas path metal shell 2. The temperature of the water-cooling liquid can be transmitted to the gas path metal shell 2, thereby performing heat exchange with the gas in the gas path pipe. By controlling the temperature of the water-cooling liquid in the circulation pipeline, the temperature control of the gas in the gas path pipe is achieved, thereby improving the efficiency of temperature adjustment inside the leaf chamber.

[0056] like Figure 1 and Figure 8 As shown, the compression temperature control device 15 includes a compressor 5 and a fan 11 and a heat exchanger 7 arranged on one side of the compressor 5. The heat exchanger 7 is tightly connected to the compressor 5, and also includes an oil pump 9, a water tank 10 and a battery 6. The heat exchanger 7, the oil pump 9 and the water tank 10 are all connected to the circulation pipeline. A temperature sensor 12 is arranged inside the water tank 10. The compressor 5, the fan 11, the heat exchanger 7, the oil pump 9 and the temperature sensor 12 are all electrically connected to the control module 8. The battery 6 is electrically connected to the compressor 5, the fan 11, the oil pump 9, the heat exchanger 7 and the control module 8 respectively. The oil pump 9, the heat exchanger 7 and the water tank 10 are all connected through the circulation pipeline.

[0057] The compressor 5 is used to compress the refrigerant and deliver the compressed refrigerant to the heat exchanger 7. In the embodiment of the present application, the compressor 5 is a single-rotor silent compressor with a power of 130W, a compressor 5 dedicated driver with a maximum input voltage of 30V, and supports pid analog voltage control.

[0058] The refrigerant is a refrigerant. When the compressor 5 is in the heating mode, the compressor 5 compresses the refrigerant into a high-temperature and high-pressure gas, and then the high-temperature and high-pressure refrigerant gas flows directly to the heat exchanger 7. In the heat exchanger 7, the refrigerant releases heat through the condensation process, and the heat is transferred to the water-cooled liquid flowing through, thereby achieving a heating effect.

[0059] When the compressor 5 is in the refrigeration mode, the compressor 5 also compresses the refrigerant into a high-temperature and high-pressure gas. These gases flow in the opposite direction, release heat to the external environment through the condensation process, and condense into liquid. Then, the condensed refrigerant liquid is decompressed by the expansion valve, quickly vaporizes and absorbs heat, and becomes a low-temperature and low-pressure refrigerant gas. These low-temperature and low-pressure refrigerant gases then flow to the heat exchanger 7. In the heat exchanger 7, the refrigerant gas absorbs the heat of the water-cooled liquid through the evaporation process, thereby reducing the temperature of the water-cooled liquid and achieving a refrigeration effect.

[0060] The fan 11 is located on one side of the compressor 5 and is used to dissipate heat from the water-cooling liquid inside the compressor 5. In the embodiment of the present application, the fan 11 is a high-speed, high-air volume cooling fan with a voltage specification of 24V, 0.75A, a power of 2.6W, and a maximum speed of 5200rpm, and is used to dissipate heat from the refrigeration system of the compressor 5.

[0061] The heat exchanger 7 is used to transfer the heat generated by the compressor 5 to the water-cooling liquid, or absorb the heat of the water-cooling liquid to achieve heat transfer with the water-cooling liquid. In the embodiment of the present application, the heat exchanger 7 is a stainless steel heat exchanger with a single-layer heat exchange area of ​​6 cm 2 The heat exchange capacity can reach 300W and the size is 120×55×18mm.

[0062] The oil pump 9 is used to drive the circulation of the water-cooling liquid inside the circulation pipeline. In the embodiment of the present application, the oil pump 9 is a brushless oil pump with a head of 30m. The motor of the brushless oil pump is driven by direct current, and the motor drives the impeller of the brushless oil pump to rotate, so that the pressure of the water-cooling liquid in the compressor 5 is increased, thereby realizing the flow circulation of the water-cooling liquid.

[0063] The water tank 10 is used to store the water-cooling liquid. In the embodiment of the present application, the water tank 10 is made of a transparent material or a translucent material. The water tank 10 made of a transparent or translucent material allows the user to directly observe the state of the water-cooling liquid inside the water tank 10. By observing the state of the water-cooling liquid inside the water tank 10, the user can promptly discover abnormal conditions, such as leakage, overheating, impurities and contamination, etc. By setting a temperature sensor 12 in the water tank 10, the control module 8 obtains the current temperature in the circulation pipeline through the temperature sensor 12, thereby achieving the accuracy of the water-cooling liquid temperature monitoring inside the circulation pipeline.

[0064] Battery 6 is a lithium battery with a storage capacity of 1.2 kWh. The size of Battery 6 is 55×32×16 cm. It is also equipped with a 2-core aviation plug and has a battery life of up to 8 hours.

[0065] In the embodiment of the present application, the control module 8 generates a processing process of a control strategy based on the target temperature and the current temperature, including:

[0066] When the current temperature is greater than the target temperature, the control strategy is to control the compressor 5 to be in a refrigeration system state, and control the operating frequency of the compressor 5 by frequency conversion, while controlling the fan 11 and the heat exchanger 7 to be in an on state until the current temperature reaches the target temperature.

[0067] When the current temperature is not greater than the target temperature, the control strategy is to control the compressor 5 to be in a heating system state and control the operating frequency of the compressor 5 by frequency conversion, while controlling the heat exchanger 7 to be in an open state until the current temperature reaches the target temperature.

[0068] In the embodiment of the present application, the control module 8 includes a control panel, which is used to display the current temperature of the water-cooling liquid detected by the temperature sensor 12. The size of the control panel is 76×56 mm. During use, you can click the "Set" button on the control panel, and then use the "+" and "-" buttons to set the temperature shown on the panel to the target temperature of the experiment.

[0069] When working, the oil pump 9 starts, driving the water-cooling liquid inside the circulation pipe to start circulating, and at the same time, the compressor 5 runs, compresses the refrigerant, and delivers the compressed refrigerant to the heat exchanger 7. Driven by the oil pump 9, the water-cooling liquid flows through the heat exchanger 7 and exchanges heat with the compressor 5, further changing the temperature of the water-cooling liquid in the heat exchanger 7, thereby realizing precise control of the temperature of the water-cooling liquid.

[0070] By precisely controlling the compressor 5, the fan 11 and the heat exchanger 7 through the control module 8, it is possible to ensure that the temperature of the water-cooling liquid is accurately adjusted, thereby achieving precise control of the leaf chamber temperature of the photosynthetic fluorescence measurement system. The user only needs to set the target temperature through the control module 8, and the system can automatically complete the temperature adjustment and control work, thereby simplifying the operation process.

[0071] like Figures 2 to 7 As shown, the circulation pipeline includes two first pipelines and second pipelines which are connected to the heat exchanger 7 at the same time. The end of the first pipeline away from the heat exchanger 7 is connected to the first liquid cooling circuit 13 of the upper metal shell 1 of the blade chamber and the third liquid cooling circuit 21 of the gas path metal shell 2 in sequence, and flows back to the heat exchanger 7;

[0072] One end of the second pipeline away from the heat exchanger 7 is connected to the second liquid cooling circuit 14 inside the metal shell 3 at the lower part of the first blade chamber, and flows back to the heat exchanger 7 .

[0073] The water-cooling liquid starts from the heat exchanger 7 and enters the pipe connected to the first liquid cooling circuit 13 of the upper metal shell 1 of the blade chamber for heat exchange, and then enters the third liquid cooling circuit 21 of the gas path metal shell 2 to exchange heat with the internal gas path, and then flows into the heat exchanger 7 to exchange heat with the compressor 5. The compressor 5 transfers the temperature to the heat exchanger 7 through the refrigerant, further changing the temperature of the water-cooling liquid in the heat exchanger 7 and performing the next cycle;

[0074] At the same time, the water-cooling liquid also enters the pipe connected to the second liquid cooling circuit 14 inside the lower metal shell 3 of the first blade chamber for heat exchange, and then flows into the heat exchanger 7 to exchange heat with the compressor 5. The compressor 5 transfers the temperature to the heat exchanger 7 through the refrigerant, further changing the temperature of the water-cooling liquid in the heat exchanger 7 and performing the next circulation, and finally delivering the temperature of the water-cooling liquid to the upper metal shell 1 of the blade chamber, the lower metal shell 3 of the first blade chamber and the gas path metal shell 2.

[0075] In the present embodiment, the first pipe located at the water inlet end near the upper metal shell 1 of the blade chamber and the second pipe located at the water inlet end near the lower metal shell 3 of the first blade chamber are both connected to the same third pipe through a Y-shaped three-way pipe, and the third pipe is finally connected to the heat exchanger 7 through the oil pump 9. The first pipe located at the water outlet end near the gas path metal shell 2 and the second pipe located at the water outlet end near the lower metal shell 3 of the first blade chamber are connected to the same fourth pipe through another Y-shaped three-way pipe, and the fourth pipe is connected to the water tank 10 and the heat exchanger 7 in sequence.

[0076] The first pipeline includes two 0.5 m long PVC pipelines and one 0.3 m long PVC pipeline, the second pipeline includes two 0.5 m long PVC pipelines, and the third pipeline and the fourth pipeline are both 1 m long PVC pipelines.

[0077] During assembly, connect two 1m long PVC pipes to two Y-shaped tees respectively, use four 0.5m long PVC pipes to connect the remaining four pipe openings of the two Y-shaped tees, and wrap the PVC pipes with thermal insulation sponge. Connect the two 0.5m PVC pipes connected to the first Y-shaped tee to the water inlets of the upper metal shell 1 of the leaf chamber and the first lower metal shell 3 respectively, connect the other two 0.5m PVC pipes connected to the second Y-shaped tee to the water outlets of the gas path metal shell 2 and the first lower metal shell 3 respectively, and use a 0.3m to connect the water outlet of the upper metal shell 1 of the leaf chamber and the water inlet of the gas path metal shell 2. Connect the other ends of the two 1m long PVC pipes to the oil pump 9 and water tank 10 of the compressor 5 respectively.

[0078] The working process of the temperature control device of the photosynthetic fluorescence measurement system provided by the present invention for temperature control of the leaf chamber is as follows:

[0079] S1, assemble PVC pipes and Y-type tee pipes, and wrap the pipes with thermal insulation sponge;

[0080] S2, the upper metal casing 1 of the leaf chamber, the lower metal casing 3 of the first leaf chamber, the lower metal casing 4 of the second leaf chamber is fixed to the leaf chamber, the gas path metal casing 2 is fixed to the gas path tube entering the leaf chamber;

[0081] S3, assemble the pipe wrapped with the thermal insulation sponge with the upper metal shell 1 of the blade chamber, the lower metal shell 3 of the first blade chamber, the gas path metal shell 2, the compressor 5, the water tank 10, etc., add water coolant to the water tank 10, click the control panel to turn on the power of the compression temperature control device 15, and stop adding water coolant after the water coolant flows into the circulation pipe and the water coolant level in the water tank 10 remains stable, and insert the temperature sensor 12 into the acrylic water tank 10;

[0082] S4, after clamping the leaves to be observed in the leaf chamber, click the "Set" button on the control panel, and adjust the temperature to the target temperature of the experiment through the "+" and "-" buttons. The control module 8 controls the compression temperature control device 15 to adjust the temperature of the water-cooling liquid in the circulation pipeline according to the target temperature and the current temperature detected by the temperature sensor 12, until the leaf chamber temperature displayed in the photosynthetic fluorescence measurement system reaches the target temperature, and then use the photosynthetic fluorescence measurement system to start field observation.

[0083] According to the temperature control device of a photosynthetic fluorescence measurement system proposed by the present invention, under the condition of an ambient temperature of 28°C, the photosynthetic fluorescence measurement system is used to carry out the temperature response curve measurement of photosynthesis of Campanula, and 7 temperature gradients of 10, 15, 20, 25, 30, 35, and 40 degrees are set in the experiment. The specific experimental results are shown in Table 1. The results show that the controllable temperature control range of the photosynthetic fluorescence measurement system combined with the present invention is increased from the original ambient temperature ±10°C to 10-40°C. It can be seen that the invention solves the problem that the photosynthetic fluorescence measurement system cannot stably and accurately control the leaf chamber temperature in the field environment in previous observations, which is convenient for experimenters to obtain more abundant and accurate experimental data when measuring the physiological and ecological parameters of plant leaves.

[0084] Table 1

[0085]

[0086] The implementation principle of the temperature control device of a photosynthetic fluorescence measurement system provided by the present invention is:

[0087] After setting the target temperature of the experiment on the control panel, the control module 8 controls the rotation of the compressor 5 rotor by frequency conversion based on the current temperature and target temperature of the water-cooling liquid, and the water-cooling liquid temperature (within the range of 10-40°C) is controlled by releasing and absorbing heat during the vaporization and liquefaction of the refrigerant through the cycle of suction-compression-exhaust process. The temperature-controlled water-cooling liquid is transported to the circulation pipeline by the oil pump 9, and heat is exchanged with the leaf chamber and the gas path through the hollow metal shell, and the temperature of the leaf chamber and the gas path is gradually adjusted, thereby expanding the temperature range of the photosynthetic fluorescence measurement system for temperature control. The temperature is expanded from the original ambient temperature of ±10°C to 10-40°C, so that the field measurement of plant photosynthesis rate and fluorescence parameters is no longer or less restricted by the external ambient temperature, and provides measurement technology and methods for in-depth research on the response and adaptability mechanism of plant physiological and ecological processes to temperature under different temperature conditions in the field; at the same time, the device can accurately control the temperature of the leaf chamber according to the experimental requirements, avoid the energy loss of the instrument due to excessive temperature control power, and to a certain extent make up for the lack of battery life of the current field observation instrument 6.

[0088] The terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In addition, the terms "first", "second" and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, features defined as "first", "second" and "third" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0089] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of application involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the aforementioned application concept. For example, the above features are replaced with (but not limited to) technical features with similar functions applied in the present application.

Claims

1. A temperature control device for a photosynthetic fluorescence measurement system, characterized in that: It comprises a hollow metal shell sleeved on the outer side of the leaf chamber of the photosynthetic fluorescence measurement system and a compression temperature control device (15) connected to the hollow metal shell, the compression temperature control device (15) being connected to a circulation pipeline, the interior of the circulation pipeline being filled with water cooling liquid, and the circulation pipeline being in communication with the hollow metal shell; It also includes a control module (8) for obtaining a target temperature set by a user and a current temperature of the water-cooling liquid in the circulation pipeline; and generating a control strategy based on the target temperature and the current temperature; The compression temperature control device (15) is used to adjust the temperature of the water-cooling liquid in the circulation pipeline based on the control strategy, so that the temperature of the water-cooling liquid is transmitted to the hollow metal shell; The hollow metal shell comprises an upper metal shell of a blade chamber (1), a lower metal shell of a first blade chamber (3), a lower metal shell of a second blade chamber (4) and a gas path metal shell (2); a first liquid cooling circuit (13) is provided inside the upper metal shell of the blade chamber (1); a second liquid cooling circuit (14) is provided inside the lower metal shell of the first blade chamber (3); and both the first liquid cooling circuit (13) and the second liquid cooling circuit (14) are connected to the circulation pipeline.

2. The temperature control device of a photosynthetic fluorescence measurement system according to claim 1, characterized in that: A third liquid cooling circuit (21) is provided inside the gas path metal shell (2), and the third liquid cooling circuit (21) is connected to the circulation pipeline.

3. The temperature control device of a photosynthetic fluorescence measurement system according to claim 2, characterized in that: The compression temperature control device (15) comprises a compressor (5), a fan (11) and a heat exchanger (7) arranged on one side of the compressor (5), and also comprises an oil pump (9), wherein the oil pump (9) and the heat exchanger (7) are both connected to the circulation pipeline, and the compressor (5), the fan (11), the heat exchanger (7) and the oil pump (9) are all electrically connected to the control module (8); The compressor (5) is used to compress the refrigerant and transport the compressed refrigerant to the heat exchanger (7); The fan (11) is used to dissipate heat from the water-cooling liquid inside the compressor (5); The heat exchanger (7) is used to transfer the heat generated by the compressor (5) to the water-cooling liquid, or to absorb the heat of the water-cooling liquid; The oil pump (9) is used to drive the water-cooling liquid in the circulation pipeline to circulate.

4. The temperature control device of a photosynthetic fluorescence measurement system according to claim 3, characterized in that: The circulation pipeline comprises two first pipelines and second pipelines which are connected to the heat exchanger (7) at the same time; the end of the first pipeline away from the heat exchanger (7) is connected to the first liquid cooling circuit (13) of the upper metal shell (1) of the blade chamber and the third liquid cooling circuit (21) inside the gas path metal shell (2) in sequence, and flows back to the heat exchanger (7); One end of the second pipe away from the heat exchanger (7) is connected to the second liquid cooling circuit (14) of the lower metal shell (3) of the first blade chamber, and flows back to the heat exchanger (7).

5. The temperature control device of a photosynthetic fluorescence measurement system according to claim 3, characterized in that: The compression temperature control device (15) further comprises a water tank (10), the water tank (10) being in communication with the circulation pipeline, the water tank (10) being used to store the water-cooling liquid, a temperature sensor (12) being provided inside the water tank (10) for detecting the temperature of the water-cooling liquid, the temperature sensor (12) being connected to the control module (8).

6. The temperature control device of a photosynthetic fluorescence measurement system according to claim 5, characterized in that: The water tank (10) is made of a transparent material or a translucent material.

7. The temperature control device of a photosynthetic fluorescence measurement system according to claim 3, characterized in that: The compression temperature control device (15) further comprises a battery (6), wherein the battery (6) is electrically connected to the compressor (5), the fan (11), the heat exchanger (7), the oil pump (9) and the control module (8) respectively.

8. The temperature control device of a photosynthetic fluorescence measurement system according to claim 3, characterized in that: The circulation pipeline is a PVC pipeline, the compressor (5) is a single-rotor silent compressor, the heat exchanger (7) is a stainless steel heat exchanger, and the oil pump (9) is a brushless oil pump.

9. The temperature control device of a photosynthetic fluorescence measurement system according to claim 1, characterized in that: The outer side of the circulation pipeline is sheathed with a heat-insulating sponge.

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