An anti-freezing heaving device for a solar panel support pipe pile

Abstract

The present invention belongs to the technical field of solar photovoltaic and solar thermal energy, and particularly relates to an anti-freezing and swelling device for a solar panel support pipe pile, which comprises a heat exchange system, a refrigeration system and a control system; the heat exchange system includes heat exchangers, a water supply pipe and a water return pipe arranged on both sides of the solar panel support pipe pile; the refrigeration system includes a water outlet pipe, a water inlet pipe, a refrigeration unit, a first flexible joint, a first pressure gauge, a thermometer, a first stop valve, a first butterfly valve, a first electric two-position valve, a water pump, a second flexible joint, a second stop valve, a second pressure gauge, a second butterfly valve, a second electric two-position valve, an electric check valve and a Y-type filter; the control system includes a temperature sensing probe and a signal wire; the temperature sensing probe is arranged outside the heat exchanger, and the temperature sensing probe is connected to the control system through the signal wire, and a signal wire interface is arranged on the signal wire on the ground. The control temperature is set according to the environmental and soil conditions of the implementation site, and the temperature around the pipe pile is adjusted to keep the soil hardness in the control area consistent, which has extremely high stability.

Description

Technical Field

[0001] The invention belongs to the technical field of solar photothermal and photovoltaic technologies, and particularly relates to an anti-freezing and swelling device for a solar panel support pipe pile. Background Art

[0002] At present, solar photothermal and photovoltaic technologies are mostly applied in environments with seasonal frozen soil. Since the inside of the solar panel support pipe pile is hollow, if there is water or highly frost-susceptible soil in the hollow part, after the temperature drops in winter, the water or soil freezes and swells, which will cause the pipe pile to crack and be damaged, generating longitudinal cracks, or the soil around the pipe pile freezes and swells, causing the pile body to be uplifted and unstable. In view of the frost heaving phenomenon, the existing solutions mostly replace the highly frost-susceptible soil with low frost-susceptible sandy soil, which has a high cost and poor adaptability in geological environments with a high groundwater level. Summary of the Invention

[0003] In order to solve the above technical problems, the invention provides an anti-freezing and swelling device for a solar panel support pipe pile, so as to solve the problem of poor anti-freezing and swelling effect of the solar panel support pipe pile in the prior art.

[0004] The technical solution adopted by the invention is as follows: an anti-freezing and swelling device for a solar panel support pipe pile, comprising a heat exchange system, a refrigeration system and a control system; the heat exchange system includes heat exchangers, a water supply pipe and a water return pipe arranged on both sides of the solar panel support pipe pile; the refrigeration system includes a water outlet pipe, a water inlet pipe, a refrigeration unit, a first flexible joint, a first pressure gauge, a thermometer, a first stop valve, a first butterfly valve, a first electric two-position valve, a water pump, a second flexible joint, a second stop valve, a second pressure gauge, a second butterfly valve, a second electric two-position valve, an electric check valve and a Y-type filter; the control system includes a temperature sensing probe and a signal line; the water supply pipe and the water return pipe of the heat exchanger are respectively communicated with the water inlet pipe and the water outlet pipe; the water inlet pipe and the water outlet pipe are respectively communicated with the refrigeration unit through the first flexible joint. The water inlet pipe is successively provided with a first stop valve, a first pressure gauge, a thermometer and a first butterfly valve. The water outlet pipe is provided with a first stop valve, a first pressure gauge, a thermometer, a first butterfly valve, a first electric two-position valve, a second butterfly valve, a second electric two-position valve, an electric check valve, a second pressure gauge, a second stop valve, a second flexible joint, a water pump and a Y-type filter. The first electric two-position valve is connected in parallel with a bypass pipe. First butterfly valves are respectively arranged on both sides of the bypass pipe and the first electric two-position valve. Second flexible joints, second stop valves, electric check valves and Y-type filters are respectively arranged at both ends of the water pump; the temperature sensing probe is arranged outside the heat exchanger, and the temperature sensing probe is connected to the control system through a signal line. A signal line interface is arranged on the signal line on the ground.

[0005] Further, the distance between the heat exchanger and the solar panel support pipe pile is 1 meter, and its bottom is flush with the bottom of the pipe pile and backfilled with sandy soil.

[0006] Furthermore, the heat exchanger is a coil-type heat exchanger with 18 rows, and its material is galvanized steel pipe.

[0007] Furthermore, the temperature sensing probes are respectively located outside the heat exchanger, with a distance of 1 meter from the heat exchanger, and the bottom is flush with the pipe pile. The signal line is connected to the refrigeration unit through a signal line interface to control the start-up temperature to be at least 0°C.

[0008] Furthermore, the water supply pipe and the water return pipe are both galvanized steel pipes, and the outer sides are wrapped with rubber-plastic insulation materials.

[0009] Furthermore, the water pump is a variable frequency water pump whose switch is controlled by a temperature control signal line.

[0010] Furthermore, the first pressure gauge and thermometer are installed on the water supply and return pipes before and after the refrigeration unit, the first electric two-position valve is connected to the operation switch of the refrigeration unit by the control line, the first butterfly valve is arranged before and after the refrigeration unit, and the bypass pipeline is arranged on the water supply pipe of the refrigeration unit. The second electric valve controls the operation switch of the water pump, the two second pressure gauges and the two second butterfly valves are respectively installed before and after the water pump, a Y-type filter and an electric check valve are respectively arranged before and after the water pump, and two pairs of stop valves are respectively installed on the branches before and after the refrigeration unit and the water pump. The two electric two-position valves are connected to the control line to control the switch of the water pump and the refrigeration unit respectively, and multiple butterfly valves are arranged before and after the water pump and the refrigeration unit to control the pressure head and flow rate of the refrigerant in the pipeline. The temperature probe is arranged 1 meter away from the outside of the coil, and is connected to the refrigeration unit control system through a signal line. The feedback temperature controls the operation and shutdown of the refrigeration unit and the water pump. In early winter, the system is operated to cool the soil within the control environment. The temperature probe controls the temperature of the 9m near the pipe pile. 2 The lowest temperature in the range is not higher than 0℃, which freezes the water in the soil and forms frozen soil in a small area. The high-density and high-hardness frozen soil acts as a protective layer in winter, reducing the shear force caused by the frost heaving of a large area of ​​frozen soil in late winter on the solar collector bracket pipe piles.

[0011] The beneficial effects of the present invention are as follows: it has a wide range of applications and can be popularized in areas where frozen soil frost heave hazards exist. Compared with traditional anti-freeze heave devices, it has the advantages of outstanding stability, strong durability, and low operating energy consumption, and has great market development prospects in the future. Its main advantages are as follows:

[0012] (1) Use the refrigeration system to lower the soil temperature around the solar panel support piles, so that the soil temperature around the piles is lower than the freezing point of water. The water in the soil solidifies to form local frozen soil. When a large area of ​​the soil freezes, the high-strength frozen soil acts as a protective shell to alleviate the frost heave shear stress on the solar panel piles.

[0013] (2) The anti-freezing heaving system of the solar panel support pipe pile has the advantage of intelligent control. Through the electrical signals of the temperature sensors, it controls the opening degree of the butterfly valve and the switch of the on-off valve, realizes the intelligent control of the water pump and the refrigeration unit, slows down the soil temperature fluctuation, and ensures the stability of the local frozen soil shell.

[0014] (3) The operation time of the anti-freezing heaving system of the solar collector support pipe pile is two weeks before the local soil temperature is lower than 0°C (which can be adjusted according to the usage situation). The operation time is short and the operation energy consumption is relatively low. Description of the Drawings

[0015] Figure 1 is the structural schematic diagram of Embodiment 1;

[0016] Figure 2 is the schematic diagram of the refrigeration system in Embodiment 1;

[0017] Figure 3 is the schematic diagram of the parallel use of multiple solar panel support pipe piles and heat exchangers in Embodiment 1;

[0018] Figure 4 is the working principle diagram of the refrigeration unit in Embodiment 2. Detailed Implementation Modes

[0019] Embodiment 1

[0020] Refer to Figures 1 - 3, an anti-freezing device for a solar panel support pipe pile, comprising a heat exchange system, a refrigeration system and a control system; the heat exchange system includes heat exchangers 2, a water supply pipe 3 and a return water pipe 4 arranged on both sides of the solar panel support pipe pile 1; the refrigeration system includes a water outlet pipe 8, a water inlet pipe 9, a refrigeration unit 10, a first flexible joint 11, a first pressure gauge 12, a thermometer 13, a first stop valve 14, a first butterfly valve 15, a first electric two-position valve 16, a water pump 17, a second flexible joint 18, a second stop valve 19, a second pressure gauge 20, a second butterfly valve 21, a second electric two-position valve 22, an electric check valve 23 and a Y-type filter 24; the control system includes a temperature sensing probe 5 and a signal line 6; the water supply pipe 3 and the return water pipe 4 of the heat exchanger 2 are respectively communicated with the water inlet pipe 9 and the water outlet pipe 8; the water inlet pipe 9 and the water outlet pipe 8 are respectively communicated with the refrigeration unit 10 through the first flexible joint 11. The water inlet pipe 9 is successively provided with a first stop valve 14, a first pressure gauge 12, a thermometer 13 and a first butterfly valve 15. The water outlet pipe 8 is provided with a first stop valve 14, a first pressure gauge 12, a thermometer 13, a first butterfly valve 15, a first electric two-position valve 16, a second butterfly valve 21, a second electric two-position valve 22, an electric check valve 23, a second pressure gauge 20, a second stop valve 19, a second flexible joint 18, a water pump 17 and a Y-type filter 24. The first electric two-position valve 16 is connected in parallel with a bypass pipe. First butterfly valves 15 are respectively arranged on both sides of the bypass pipe and the first electric two-position valve 16. The two ends of the water pump 17 are respectively provided with a second flexible joint 18, a second stop valve 19, an electric check valve 23 and a Y-type filter 24; the temperature sensing probe 5 is arranged outside the heat exchanger 2, and the temperature sensing probe 5 is connected to the control system through the signal line 6. A signal line interface 7 is arranged on the signal line 6 on the ground; the distance between the heat exchanger 2 and the solar panel support pipe pile 1 is 1 meter, its bottom is flush with the bottom of the pipe pile, and it is backfilled with sandy soil; the heat exchanger 2 is a coil-type heat exchanger, with a total of 18 rows, and its material is galvanized steel pipe; the temperature sensing probes 5 are respectively located outside the heat exchanger 2, the distance between it and the heat exchanger 2 is 1 meter, the bottom is flush with the pipe pile, the signal line 6 is connected to the refrigeration unit 10 through the signal line interface 7, and the control start temperature is at least 0 °C; both the water supply pipe 3 and the return water pipe 4 are made of corrosion-resistant and high-strength galvanized steel pipes, with a pipe diameter of 50 mm, and are wrapped with closed-cell rubber and plastic insulation materials to ensure the refrigeration effect. The water supply and return pipes are both laid by direct burial in the pipeline. Among them, the buried depth of the water supply pipe is 0.3 meters, and the return water pipe is 0.4 meters. Specifically, when the ground above the pipeline can pass cars or there are other large equipment, the buried depths of the water supply and return pipes are both 0.7 meters; the water pump 17 is a variable-frequency water pump controlled by a temperature control signal line for the switch.

[0021] The refrigeration unit is connected to the pipeline by the first flexible joint to reduce the vibration and noise of the unit. The first pressure gauge measures the refrigerant pressure of the equipment in and out, and the first thermometer measures the refrigerant temperature of the equipment in and out. The first electric two-position valve is connected to the control line to control the operation switch of the refrigeration unit. The first butterfly valve is arranged before and after the refrigeration unit to control the head and flow of the pipeline. The bypass pipeline is arranged on the water supply pipeline of the refrigeration unit. When the system flow rate becomes smaller and the pressure difference exceeds the set value, the electric first butterfly valve automatically opens, and part of the flow passes through here to ensure that the flow rate of the unit is not less than the limit value. The water pump is connected to the water supply pipeline by the second flexible joint. The second electric valve controls the operation switch of the water pump. The second pressure gauge measures and displays the pressure before and after the water pump, and controls the head and flow before and after the water pump through the second butterfly valve. A Y-type filter is provided in front of the water pump to remove impurities in the pipeline, and an electric check valve is provided behind the water pump to prevent backflow and ensure the safe operation of the water pump. The temperature sensing probe is arranged 1 meter away from the outside of the coil, and the burial depth is flush with the pipe pile of the solar panel support. The signal is fed back through the signal line to control the operation of the system and maintain the temperature of the control area.

[0022] This solar panel support pipe pile anti-freezing heaving system is used in the early winter season. When the outdoor temperature is close to zero degrees, start the system to cool the soil around the pipe pile, so that the moisture in the soil condenses to form local frozen soil. The high-strength frozen soil serves as the outer shell to protect the pipe pile. When the ambient soil temperature is below zero degrees, it effectively weakens the shear force effect of large-area soil freezing and heaving on the pipe pile. This system contains a temperature intelligent control system, and the control temperature is at least 0 degrees. The temperature sensing probe feeds back the temperature to the refrigeration unit and the water pump through the control line. When the detected temperature is lower than the control temperature, the electric valves of the refrigeration unit and the water pump close, and the system stops running. When the detected temperature is higher than the control temperature, the electric valves of the refrigeration unit and the water pump open, and the system runs to cool the soil. Multiple butterfly valves are arranged on the supply and return water pipelines to achieve the purpose of controlling the system flow rate according to the environment. It should be noted that the refrigerant and system pressure should be selected according to the lowest ambient temperature in the use area to ensure that the freezing temperature of the refrigerant under the system pressure condition is lower than the ambient temperature to prevent the refrigerant from solidifying and damaging the system. After the system layout is completed and before backfilling the soil, the pipeline should be flushed to avoid blockage of the pipeline caused by sundries and sediment during construction, welding, etc.

[0023] When there are multiple solar panel support pipe piles in the same area, the heat exchangers can be arranged on both sides of the pipe piles according to the pipe pile layout as described above. The water supply end and the return water end of the heat exchanger are respectively connected in parallel to the supply and return water pipelines. The temperature sensing probe is arranged on the outside of the entire area, 1 m away from the outermost pipe pile, and the area where all the pipe piles are located is used as the control area for cooling.

[0024] Apply the refrigeration system to the field of preventing frost heaving of the pipe piles of the solar collector support. Use two coils with 18 rows and a length of 0.5 meters as the heat exchanger, a refrigeration unit with a control system as the cold source, and the signal provided by the temperature sensing probe as the control source. In the early winter season of each year, cool down the local soil around the pipe piles to freeze the moisture in the soil. When the temperature of the temperature sensing probe is lower than the set temperature (at least 0 degrees), the electric valve receives a weak electric signal and closes the valve, and the refrigeration unit and the water pump stop operating. When the temperature of the temperature sensing probe is higher than the set temperature, the electric valve receives a weak electric signal and opens the valve, and the refrigeration unit and the water pump start to work. This forms a stable and high-hardness frozen soil "shell" around the pipe piles. In the deep winter season, when the temperature of the large-area soil is lower than the freezing point of water, the soil in the control area can effectively reduce the influence of the shear stress caused by the frost heaving of the large-area soil on the pipe piles.

[0025] The anti-frost heaving system that uses a refrigeration unit to cool the soil locally only needs to operate in the early winter and can intelligently adjust the operating frequency of the unit according to the ambient temperature, having the advantage of energy conservation. The control temperature can be set according to the environmental and soil conditions of the implementation site, and the soil hardness in the control area can be kept consistent by adjusting the temperature around the pipe piles, having extremely high stability.

[0026] Embodiment 2

[0027] Refer to Figure 4 , the refrigeration unit 10 includes a compressor 25, a first condenser 26, a liquid storage dryer 27, a throttle expansion valve 28, a second condenser 29 and a temperature sensing bulb 30. The first condenser 26 and the second condenser 29 are respectively connected to the compressor 25, and the refrigeration unit 10 is an intelligent unit that can be controlled by a temperature control line.

[0028] The above content is only to illustrate the technical idea of the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed in this invention patent fall within the protection scope of the claims of this utility model invention.

Claims

1. An anti-freezing and swelling device for a solar panel support pipe pile, characterized in that: The anti-freezing heaving device for the solar panel support pipe pile includes a heat exchange system, a refrigeration system, and a control system; the heat exchange system includes heat exchangers (2), a water supply pipe (3), and a water return pipe (4) arranged on both sides of the solar panel support pipe pile (1); the refrigeration system includes a water outlet pipe (8), a water inlet pipe (9), a refrigeration unit (10), a first flexible joint (11), a first pressure gauge (12), a thermometer (13), a first stop valve (14), a first butterfly valve (15), a first electric two-position valve (16), a water pump (17), a second flexible joint (18), a second stop valve (19), a second pressure gauge (20), a second butterfly valve (21), a second electric two-position valve (22), an electric check valve (23), and a Y-type filter (24); the control system includes a temperature sensing probe (5) and a signal line (6); the water supply pipe (3) and the water return pipe (4) of the heat exchanger (2) are respectively communicated with the water inlet pipe (9) and the water outlet pipe (8); the water inlet pipe (9) and the water outlet pipe (8) are respectively communicated with the refrigeration unit (10) through the first flexible joint (11), the water inlet pipe (9) is successively provided with a first stop valve (14), a first pressure gauge (12), a thermometer (13), and a first butterfly valve (15), the water outlet pipe (8) is provided with a first stop valve (14), a first pressure gauge (12), a thermometer (13), a first butterfly valve (15), a first electric two-position valve (16), a second butterfly valve (21), a second electric two-position valve (22), an electric check valve (23), a second pressure gauge (20), a second stop valve (19), a second flexible joint (18), a water pump (17), and a Y-type filter (24), the first electric two-position valve (16) is connected in parallel with a bypass pipe, and first butterfly valves (15) are respectively arranged on both sides of the bypass pipe and the first electric two-position valve (16), and second flexible joints (18), a second stop valve (19), an electric check valve (23), and a Y-type filter (24) are respectively arranged at both ends of the water pump (17); the temperature sensing probe (5) is arranged outside the heat exchanger (2), and the temperature sensing probe (5) is connected to the control system through the signal line (6); The distance between the heat exchanger (2) and the solar panel support pipe pile (1) is 1 meter, its bottom is flush with the bottom of the pipe pile, and it is backfilled with sandy soil; The heat exchanger (2) is a coil-type heat exchanger, with a total of 18 rows, and its material is galvanized steel pipe; The temperature sensing probes (5) are respectively located outside the heat exchanger (2), the distance between it and the heat exchanger (2) is 1 meter, the bottom is flush with the pipe pile, and the signal line (6) is connected to the refrigeration unit (10) through a signal line interface (7).

2. The anti-freezing and swelling device for the solar panel support pipe pile according to claim 1, wherein: Both the water supply pipe (3) and the water return pipe (4) are galvanized steel pipes, and the outer sides are wrapped with rubber and plastic insulation materials.

3. The anti-freezing heaving device for a solar panel support pipe pile according to claim 1, characterized in that: The water pump (17) is a variable frequency water pump.

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