Integrated pump station anti-freezing ventilation system based on renewable energy sources

Abstract

The invention discloses an integrated pump station anti-freezing ventilation system based on renewable energy sources, which comprises a pump station barrel, a circulating fan A is arranged at an air inlet of the pump station barrel, and a circulating fan B is arranged at an air outlet of the pump station barrel; the circulating fan A is connected with an air outlet A of the solar heat collection device and an air outlet B of the geothermal source heat supply device through a first valve, and the circulating fan B is connected with an air inlet A of the solar heat collection device and an air inlet B of the geothermal source heat supply device through a second valve; and the first valve, the second valve, the circulating fan A, the circulating fan B and the geothermal source heat supply device are all electrically connected with the controller. When sunlight is sufficient, the solar heat collection device fully utilizes solar energy to provide heat for the pump station barrel, and when sunlight is insufficient, the geothermal source heat supply device fully utilizes shallow geothermal resources to provide heat for the pump station barrel, so that energy consumption is reduced; during maintenance, before maintenance personnel enter the pump station barrel, harmful gas can be quickly and effectively exhausted.

Description

Technical Field

[0001] The present invention relates to the technical field of integrated pumping stations, and more particularly to an integrated pumping station antifreeze ventilation system based on renewable energy. Background Art

[0002] An integrated pumping station is a device that combines a traditional pump room with a sewage lifting system, ventilation system, control system, and piping system to lift sewage, rainwater, and wastewater. Compared with traditional pumping stations, integrated pumping stations have the advantages of strong environmental adaptability, small footprint, and short construction period. The ambient temperature in northern regions is relatively low in winter, especially during the period of low sewage discharge in the community. Due to the low temperature in the pumping station and low sewage fluidity, the sewage in the pumping station will freeze, causing the pipeline to deform under the frost heave load. Therefore, the valve may be damaged and leakage may occur, which will greatly affect the safe operation of the integrated pumping station.

[0003] In existing integrated pumping stations, the most common passive method for preventing freezing is to wrap the outside of the pumping station with an insulation layer. However, this method cannot transfer cold air but only slows the rate of freezing, resulting in poor antifreeze performance at low temperatures. Another method is to regularly empty the pumping station to avoid freezing, but this affects the continuous operation of the pumping station. In extreme weather conditions, active antifreeze methods such as electric heating are generally used. However, because the maximum heat energy required during the heating process is uncertain, running the electric heater at constant power can result in serious energy waste.

[0004] On the other hand, during the long-term operation of the underground integrated pump station, a large amount of toxic gases such as hydrogen sulfide and ammonia accumulate in the pump station cylinder. When maintenance personnel need to enter the pump station cylinder for maintenance, the presence of toxic gases poses a threat to their health. The current solution includes: opening the cylinder cover before maintenance personnel enter the pump station cylinder and allowing a long period of natural ventilation; however, this method is time-consuming, and the high-density toxic gases are deposited at the bottom of the pump station cylinder and are not easy to discharge. Another method is to add an axial flow fan to the cylinder cover to forcibly discharge the harmful gases in the pump station cylinder, but this method consumes a lot of electricity. Therefore, it is necessary to propose an integrated pump station anti-freeze ventilation system based on renewable energy, which can ensure the safety of maintenance personnel while taking effective measures to prevent the integrated pump station from frost heaving, so as to solve the problems existing in the existing technology. Summary of the Invention

[0005] The Summary of the Invention introduces a series of simplified concepts that will be further described in the Detailed Description of the Invention. The Summary of the Invention is not intended to limit the key features and essential features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0006] In order to at least partially solve the above problems, the present invention provides an integrated pump station antifreeze ventilation system based on renewable energy, comprising: a pump station cylinder, a circulating fan A is provided at the air inlet of the pump station, and a circulating fan B is provided at the air outlet; the circulating fan A is connected to the air outlet A of the solar thermal collection device and the air outlet B of the geothermal source heating device through a first valve, and the circulating fan B is connected to the air inlet A of the solar thermal collection device and the air inlet B of the geothermal source heating device through a second valve; a controller, the first valve, the second valve, the circulating fan A, the circulating fan B and the geothermal source heating device are all electrically connected to the controller.

[0007] Preferably, the first valve and the second valve are both four-way valves;

[0008] The first valve includes: a first communication port, a second communication port connected to the air outlet B of the geothermal source heating device, a third communication port connected to the circulation fan A, and a fourth communication port connected to the air outlet A of the solar thermal collector;

[0009] The second valve includes: a fifth connecting port connected to the circulation fan B, a sixth connecting port connected to the air inlet B of the geothermal source heating device, a seventh connecting port and an eighth connecting port connected to the air inlet A of the solar thermal collection device.

[0010] Preferably, a thermal switch electrically connected to the controller is provided in the cylinder of the pump station.

[0011] Preferably, the solar heat collecting device, the circulating fan A, the pump station cylinder and the circulating fan B form a solar heat supply loop.

[0012] Preferably, the geothermal source heating device includes: a vertical buried pipe for heat transfer with the geothermal source, wherein the water outlet A of the vertical buried pipe is connected to the water inlet B of the evaporator, and the water outlet B of the evaporator is connected to the water inlet A of the vertical buried pipe; the vertical buried pipe and the evaporator form a buried pipe heat exchange loop, and the buried pipe heat exchange loop is provided with a circulating pump;

[0013] Condenser, the air inlet B and the air outlet B are arranged on the condenser; the heat transfer medium outlet B of the evaporator is connected to the heat transfer medium inlet A of the condenser through a compressor, and the heat transfer medium outlet A of the condenser is connected to the heat transfer medium inlet B of the evaporator through a throttle valve; the evaporator, compressor, condenser and throttle valve form a geothermal source heat pump circuit, and the condenser, circulating fan A, pump station cylinder and circulating fan B form a geothermal source heating circuit.

[0014] Preferably, the controller controls the third connecting port, the fourth connecting port, the fifth connecting port and the eighth connecting port to be opened, and when the first connecting port, the second connecting port, the sixth connecting port and the seventh connecting port are closed, the geothermal source heating device does not work, and the solar energy heat collection device is used to heat the pump station cylinder.

[0015] Preferably, when the controller controls the first connecting port, the second connecting port, the sixth connecting port and the seventh connecting port to be opened and the third connecting port, the fourth connecting port, the fifth connecting port and the eighth connecting port to be closed, the solar thermal collection device does not work and the geothermal source heating device is used to supply heat to the pump station cylinder.

[0016] Preferably, the controller controls the first connecting port, the third connecting port, the fifth connecting port and the seventh connecting port to be opened, and when the second connecting port, the fourth connecting port, the sixth connecting port and the eighth connecting port are closed, the pump station cylinder is ventilated through the circulating fan A and the circulating fan B.

[0017] Preferably, a first temperature sensor electrically connected to the controller is provided in the cylinder of the pump station, and a second temperature sensor and a third temperature sensor electrically connected to the controller are provided at the air inlet and the air outlet of the cylinder of the pump station respectively;

[0018] During the process of the solar thermal collector or geothermal source heating device providing heat to the pump station cylinder, the circulating fans A and B both operate at a first preset speed, and the temperature inside the pump station cylinder is monitored in real time by the first temperature sensor;

[0019] If the first temperature sensor detects that the current temperature inside the pump station cylinder is higher than the preset temperature, the heat preservation time of the pump station cylinder is predicted in the case of stopping the heat supply based on the change of the external ambient temperature within the first preset time in the future, the current external ambient temperature and the current temperature;

[0020] If the heat preservation time is greater than or equal to the first preset time, the heating is stopped;

[0021] If the holding time is less than the first preset time, the solar heat collecting device or the geothermal source heating device is used to continue to heat the pump station cylinder;

[0022] Among them, the insulation time is the time required for the pump station cylinder to drop from the current temperature to the preset temperature.

[0023] Preferably, the method of predicting the heat preservation time of the pump station cylinder when the heat supply is stopped, based on the change of the external ambient temperature within a first preset time in the future, the current external ambient temperature and the current temperature, includes:

[0024] If the external ambient temperature remains unchanged or shows an upward trend within the first preset time in the future, the insulation time of the pump station cylinder under the condition of stopping the heating is predicted based on the current external ambient temperature and the current temperature;

[0025] If the external ambient temperature shows a downward trend within the first preset time in the future, the minimum value of the external ambient temperature and the current temperature are selected within the first preset time in the future to predict the insulation time of the pump station cylinder when the heating supply is stopped;

[0026] If the external ambient temperature shows a fluctuating trend within the first preset time in the future, the average value of the external ambient temperature and the current temperature within the first preset time in the future are selected to predict the insulation time of the pump station cylinder when the heating is stopped.

[0027] Compared with the prior art, the present invention has at least the following beneficial effects:

[0028] The integrated pump station antifreeze ventilation system based on renewable energy described in the present invention combines a solar thermal collector with a geothermal source heating device. When there is sufficient sunshine, the pump station cylinder is combined with the solar thermal collector to fully utilize solar energy to provide heat for the pump station cylinder. When there is insufficient sunshine, the pump station cylinder is combined with the geothermal source heating device to fully utilize shallow geothermal resources to provide heat for the pump station cylinder, thereby insulating the pump station cylinder and reducing energy consumption. Moreover, before maintenance personnel enter the pump station cylinder, harmful gases in the pump station cylinder can be quickly and effectively discharged to ensure the safety of maintenance personnel.

[0029] The integrated pump station antifreeze ventilation system based on renewable energy described in the present invention, other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by technical personnel in this field through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0031] Figure 1 A schematic diagram of the integrated pump station antifreeze ventilation system based on renewable energy according to the present invention;

[0032] Figure 2 This is a schematic diagram of the integrated pump station antifreeze ventilation system based on renewable energy according to the present invention using a solar thermal collector to heat the pump station cylinder;

[0033] Figure 3 This is a schematic diagram of the integrated pump station antifreeze ventilation system based on renewable energy according to the present invention using a geothermal source heating device to heat the pump station cylinder;

[0034] Figure 4 This is a schematic diagram of the integrated pump station antifreeze ventilation system based on renewable energy according to the present invention during ventilation;

[0035] Figure 5 This is a schematic diagram of the geothermal heat pump circuit in the integrated pump station antifreeze ventilation system based on renewable energy according to the present invention. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments so that those skilled in the art can implement the invention with reference to the description.

[0037] It should be understood that terms such as “having”, “including” and “comprising” used herein do not preclude the existence or addition of one or more other elements or combinations thereof.

[0038] like Figure 1 As shown, the present invention provides an integrated pump station antifreeze ventilation system based on renewable energy, including: a pump station cylinder 1, a circulating fan A2 is provided at the air inlet of the pump station, and a circulating fan B3 is provided at the air outlet; the circulating fan A2 is connected to the air outlet A of the solar thermal collector 4 and the air outlet B544 of the geothermal source heating device 5 respectively through a first valve 7, and the circulating fan B3 is connected to the air inlet A of the solar thermal collector 4 and the air inlet B543 of the geothermal source heating device 5 respectively through a second valve 8; a controller 6, and the first valve 7, the second valve 8, the circulating fan A2, the circulating fan B3 and the geothermal source heating device 5 are all electrically connected to the controller 6.

[0039] The solar thermal collector 4 is a device that absorbs solar radiation and transfers the generated heat energy to a heat exchange medium. In the thermal utilization of solar energy, the key is to convert the solar radiation energy into heat energy. Since solar energy is relatively dispersed, it must be concentrated.

[0040] The present invention uses a trough solar collector, which is a light-heat conversion method that converts light energy into heat energy through focusing, reflection and absorption, so that the heat exchange medium reaches a certain temperature. The trough solar collector is a medium-high temperature collector that can make the heat exchange medium reach a relatively high temperature.

[0041] The trough solar collector includes: a heat collecting tube and a first bracket for supporting the heat collecting tube. A trough parabolic reflector is provided on one side of the heat collecting tube for focusing and reflecting sunlight so that the heat collecting tube can fully absorb light energy and convert the light energy into heat energy through the heat collecting tube to heat the gas inside the heat collecting tube. The heat collecting tube includes a metal heat absorbing tube and a glass sleeve arranged on the outside of the metal heat absorbing tube, and the gap between the two is evacuated. The air inlet A and the air outlet A of the solar heat collecting device 4 are arranged at both ends of the heat collecting tube.

[0042] The geothermal source heating device 5 is a shallow geothermal energy resource exploited and utilized by the ground source heat pump technology; it is an economical and efficient energy-saving technology, and its operation does not generate pollution, combustion or emissions.

[0043] The above technical solution mainly solves the problem of antifreeze of integrated pumping station by combining renewable solar energy and geothermal energy resources;

[0044] When the light conditions are sufficient and the temperature in the pump station cylinder 1 is lower than the preset temperature, the geothermal source heating device 5 does not operate, but the solar thermal collecting device 4 provides heat to the pump station cylinder 1; at this time, the controller 6 can be used to control the circulation fan A2 and the circulation fan B3 to open, and the first valve 7 and the second valve 8 to control the air inlet A and the air outlet A of the solar thermal collecting device 4 to communicate with the pump station cylinder 1; then, under the power of the circulation fan A2 and the circulation fan B3, the low-temperature gas in the pump station cylinder 1 enters the heat collecting pipe from the air inlet A of the solar thermal collecting device 4, and the solar thermal collecting device 4 converts light energy into heat energy through focusing, reflection and absorption, so that the temperature of the low-temperature gas entering the heat collecting pipe is increased, thereby heating the entering low-temperature gas, and then the high-temperature gas is discharged from the air outlet A of the solar thermal collecting device 4, and the high-temperature gas enters the pump station cylinder 1 again to provide the required heat for the pump station cylinder 1, and this cycle is repeated to provide stable heat for the inside of the pump station cylinder 1;

[0045] When the light conditions are insufficient and the temperature in the pump station cylinder 1 is lower than the preset temperature, the solar thermal collector 4 does not operate, but the geothermal source heating device 5 provides heat to the pump station cylinder 1; at this time, the low-temperature medium in the heat exchange pipeline of the geothermal source heating device 5 can exchange heat with shallow geothermal energy resources (such as soil), so that the temperature of the low-temperature medium increases and becomes a high-temperature medium. At the same time, the controller 6 controls the circulation fan A2 and the circulation fan B3 to open, and controls the first valve 7 and the second valve 8 so that the air inlet B543 and the air outlet B544 of the geothermal source heating device 5 are both connected to the pump station cylinder 1. Then, under the power of the circulation fan A2 and the circulation fan B3, the low-temperature gas in the pump station cylinder 1 enters the air inlet B543 of the geothermal source heating device 5, exchanges heat with the heat exchange pipeline, and then discharges the high-temperature gas from the air outlet B544 of the geothermal source heating device, and the high-temperature gas enters the pump station cylinder 1 again. Such a cycle provides the required heat for the pump station cylinder 1.

[0046] When maintenance is required, harmful gases are discharged before maintenance personnel enter the pump station cylinder 1. At this time, the controller 6 controls the circulation fans A2 and B3 to open, and controls the first valve 7 and the second valve 8 to connect the pump station cylinder 1 with the external environment. The circulation fan A2 supplies air into the pump station cylinder 1, and the circulation fan B3 exhausts air outside the pump station cylinder 1, so as to achieve rapid ventilation, discharge harmful gases as soon as possible, save time, and ensure the safety of maintenance personnel.

[0047] Through the above technical solution, the present invention combines the solar thermal collection device 4 with the geothermal source heating device 5. When there is sufficient sunshine, the pump station cylinder 1 is combined with the solar thermal collection device 4 to fully utilize solar energy to provide heat for the pump station cylinder 1. When there is insufficient sunshine, the pump station cylinder 1 is combined with the geothermal source heating device 5 to fully utilize shallow geothermal resources to provide heat for the pump station cylinder 1, thereby keeping the pump station cylinder 1 warm and reducing energy consumption. Moreover, before maintenance personnel enter the pump station cylinder 1, harmful gases in the pump station cylinder 1 can be quickly and effectively discharged to ensure the safety of maintenance personnel.

[0048] Furthermore, a thermal switch 9 electrically connected to the controller 6 is provided in the pump station cylinder 1 .

[0049] The thermal switch 9 can monitor the temperature inside the pump station cylinder 1 in real time. When the temperature is lower than the preset temperature, the thermal switch 9 is opened and controlled by the controller 6 to start the heating operation; when the temperature is higher than the preset temperature, the thermal switch 9 is opened and controlled by the controller 6 to stop the heating operation.

[0050] like Figure 2-Figure 4 As shown, further, the first valve 7 and the second valve 8 are both four-way valves;

[0051] The first valve 7 includes: a first communication port a, a second communication port b connected to the air outlet B544 of the geothermal source heating device 5, a third communication port c connected to the circulating fan A2, and a fourth communication port d connected to the air outlet A of the solar thermal collector 4;

[0052] The second valve 8 includes: a fifth connecting port e connected to the circulation fan B3, a sixth connecting port f connected to the air inlet B543 of the geothermal source heating device 5, a seventh connecting port g and an eighth connecting port h connected to the air inlet A of the solar thermal collector 4.

[0053] Furthermore, the solar heat collecting device 4, the circulating fan A2, the pump station cylinder 1 and the circulating fan B3 form a solar heat supply loop.

[0054] like Figure 2 As shown, when the lighting conditions are sufficient and the temperature inside the pump station cylinder 1 is lower than the preset temperature, the thermal switch 9 is turned on and the solar heating circuit is turned on. The controller 6 controls the third connecting port c, the fourth connecting port d, the fifth connecting port e and the eighth connecting port h to open, and the first connecting port a, the second connecting port b, the sixth connecting port f and the seventh connecting port g to be closed. The geothermal source heating device 5 does not work, and the pump station cylinder 1 is heated by the solar heat collection device 4.

[0055] At this time, the controller 6 controls the circulation fans A2 and B3 to operate, providing gas circulation power. The low-temperature gas in the pump station cylinder 1 enters the solar thermal collector 4 from the fifth connecting port e and the eighth connecting port h for heating. After becoming high-temperature gas, it enters the pump station cylinder 1 again from the fourth connecting port d and the third connecting port c to realize circulating heating.

[0056] like Figure 1 and Figure 5 As shown, in one embodiment, the geothermal source heating device 5 includes: a vertical buried pipe 510 for heat transfer with the geothermal source, the water outlet A of the vertical buried pipe 510 is connected to the water inlet B523 of the evaporator 520, and the water outlet B524 of the evaporator 520 is connected to the water inlet A of the vertical buried pipe 510; the vertical buried pipe 510 and the evaporator 520 form a buried pipe heat exchange loop, and a circulating pump 530 is provided on the buried pipe heat exchange loop;

[0057] Condenser 540, the air inlet B543 and the air outlet B544 are arranged on the condenser 540; the heat transfer medium outlet B526 of the evaporator 520 is connected to the heat transfer medium inlet A545 of the condenser 540 through the compressor 550, and the heat transfer medium outlet A546 of the condenser 540 is connected to the heat transfer medium inlet B525 of the evaporator 520 through the throttle valve 560; the evaporator 520, the compressor 550, the condenser 540 and the throttle valve 560 form a geothermal source heat pump circuit, and the condenser 540, the circulating fan A2, the pump station cylinder 1 and the circulating fan B3 form a geothermal source heating circuit.

[0058] Furthermore, a first stop valve 570 is provided at the connection between the compressor 550 and the condenser 540 , and a second stop valve 580 and a third stop valve 590 are provided at the water inlet B523 and the water outlet B524 of the evaporator 520 , respectively.

[0059] like Figure 3 As shown, when the lighting conditions are insufficient and the temperature inside the pump station cylinder 1 is lower than the preset temperature, the thermal switch 9 is turned on, the buried pipe heat exchange circuit, the geothermal source heat pump circuit and the geothermal source heating circuit are turned on, and the controller 6 controls the first connecting port a, the second connecting port b, the sixth connecting port f and the seventh connecting port g to be opened, and the third connecting port c, the fourth connecting port d, the fifth connecting port e and the eighth connecting port h to be closed. The solar thermal collection device 4 does not work, and the pump station cylinder 1 is heated by the geothermal source heating device 5.

[0060] At this time, the controller 6 controls the circulation fans A2 and B3 to operate, providing gas circulation power, and opens all the stop valves on the underground pipe heat exchange circuit, the geothermal source heat pump circuit, and the geothermal source heating circuit, and turns on the circulation pump 530;

[0061] First, the low-temperature water on the underground pipe heat exchange loop is driven by the circulation pump 530 and enters the vertical underground pipe 510 that transfers heat with the geothermal source (such as soil). After heat exchange, the high-temperature water is discharged from the vertical underground pipe 510, and the high-temperature water enters the evaporator 520 from the water inlet B523 of the evaporator 520. The high-temperature water is transferred in the evaporator 520, so that the low-temperature and low-pressure heat transfer medium of the evaporator 520 in the geothermal source heat pump loop absorbs the heat of the high-temperature water, and the low-temperature and low-pressure heat transfer medium becomes a high-temperature and low-pressure heat transfer medium (gas), and after passing through the compressor 550, it becomes a high-temperature and high-pressure heat transfer medium (gas). The high-temperature and high-pressure heat transfer medium (gas) enters from the heat transfer medium inlet A545 of the condenser 540, and the high-temperature and high-pressure heat transfer medium The heat (gas) is transferred in the condenser 540, and the gas entering from the air inlet 544 of the condenser 540 (the gas discharged from the pump station cylinder 1) is heated. Then, the low-temperature and high-pressure heat transfer medium (liquid) is discharged from the heat transfer medium outlet A546 of the condenser 540. The low-temperature and high-pressure heat transfer medium (liquid) passes through the throttle valve 560 and becomes a low-temperature and low-pressure heat transfer medium (liquid) and enters the evaporator 520 from the heat transfer medium inlet B525 of the evaporator 520. At the same time, the low-temperature gas (the gas discharged from the pump station cylinder 1) entering from the air inlet B543 of the condenser 540 is heated, and the high-temperature gas is discharged from the air outlet B544 of the condenser 540 into the pump station cylinder 1. This cycle provides heat for the pump station cylinder 1.

[0062] The heat transfer medium may be R290 (propane) refrigerant or others.

[0063] The above technical solution makes the temperature difference between the cold source and the heat source of the geothermal source heating device 5 very small, and the performance coefficient (COP) of the entire antifreeze ventilation system can reach above 4. The overall thermodynamic economic performance is higher than that of the insulation system that only consumes electricity, and has a significant energy-saving effect.

[0064] like Figure 4 As shown, when maintenance is required, the geothermal source heating device 5 and the solar thermal collection device 4 are not working, and the controller 6 controls the first connecting port a, the third connecting port c, the fifth connecting port e and the seventh connecting port g to be opened, and the second connecting port b, the fourth connecting port d, the sixth connecting port f and the eighth connecting port h to be closed, and the pump station cylinder 1 is ventilated through the circulating fan A2 and the circulating fan B3.

[0065] The circulating fan A2 supplies air into the pump station cylinder 1, and the circulating fan B3 exhausts air outward from the pump station cylinder 1, thereby improving the efficiency of exhausting harmful gases from the pump station cylinder 1 and increasing the ventilation volume. In addition, the harmful gases in the dead corners at the bottom of the pump station cylinder 1 can be effectively discharged under a stronger ventilation intensity, thereby ensuring the safety of maintenance personnel.

[0066] like Figure 5As shown, further, the evaporator 520 includes: a first shell 521, the water inlet B523 and the water outlet B524 are provided on the first shell 521; a first coil 522 is provided inside the first shell 521, and the heat transfer medium inlet B525 and the heat transfer medium outlet B526 are respectively provided at both ends of the first coil 522;

[0067] The condenser 540 includes: a second shell 541, the air inlet B543 and the air outlet B544 are arranged on the second shell 541; a second coil 542 is provided inside the second shell 541, and the heat transfer medium inlet A545 and the heat transfer medium outlet A546 are respectively arranged at both ends of the second coil 542.

[0068] The first coil 522, the compressor 550, the second coil 542 and the throttle valve 560 form a geothermal heat pump circuit, and the heat transfer medium circulates in the geothermal heat pump circuit;

[0069] The first shell 521 is used to communicate with the vertical buried pipe 510, so that the high-temperature water in the vertical buried pipe 510 can transfer heat with the first coil 522 in the first shell 521;

[0070] The second shell 541 is used to communicate with the pump station cylinder 1 so that the low-temperature gas in the pump station cylinder 1 can transfer heat with the second coil 542 in the second shell 541 .

[0071] In one embodiment, a first temperature sensor electrically connected to the controller is provided in the pump station cylinder 1, and a second temperature sensor and a third temperature sensor electrically connected to the controller are provided at the air inlet and the air outlet of the pump station cylinder 1 respectively;

[0072] During the process of the solar heat collecting device 4 or the geothermal source heating device 5 providing heat to the pump station cylinder 1, the circulating fans A2 and B3 both operate at a first preset speed, and the temperature inside the pump station cylinder 1 is monitored in real time by the first temperature sensor;

[0073] If the first temperature sensor detects that the current temperature in the pump station cylinder 1 is higher than the preset temperature, the heat preservation time of the pump station cylinder 1 is predicted in the case of stopping the heat supply based on the change of the external ambient temperature in the first preset time in the future, the current external ambient temperature and the current temperature;

[0074] If the heat preservation time is greater than or equal to the first preset time, the heating is stopped;

[0075] If the heat preservation time is less than the first preset time, the solar heat collecting device 4 or the ground heat source heating device 5 continues to heat the pump station cylinder 1;

[0076] The insulation time is the time required for the pump station cylinder 1 to drop from the current temperature to the preset temperature.

[0077] In this embodiment, the start of the heating operation is controlled by turning on the thermal switch 9, while the stop of the heating operation needs to take into account multiple factors. This can prevent the repeated start of the heating operation, save electricity, and ensure the service life of the circulation fans A2 and B3 and the geothermal source heating device 5.

[0078] Specifically, when the solar thermal collector 4 or the geothermal source heating device 5 is supplying heat to the pump station cylinder 1, the temperature inside the pump station cylinder 1 is monitored in real time. Since heat exchange occurs between the inside of the pump station cylinder 1 and the external environment, when the temperature inside the pump station cylinder 1 is higher than a preset temperature, if the heating operation is stopped immediately, when the external environment temperature is low, the temperature inside the pump station cylinder 1 will drop in a short time. When it drops below the preset temperature, the heating operation will be restarted. Repeated restarting will reduce the service life of the circulation fan A2, the circulation fan B3 and the geothermal source heating device 5.

[0079] Therefore, a first preset time corresponding to the insulation time is set. When the insulation time is greater than or equal to the first preset time, the heating work can be stopped. When the insulation time is less than the first preset time, the heating work can be continued to prevent the heating work from being started repeatedly in a short time.

[0080] Furthermore, based on the change of the external ambient temperature within the first preset time in the future, the current external ambient temperature and the current temperature, the heat preservation time of the pump station cylinder 1 is predicted when the heat supply is stopped, including:

[0081] If the external ambient temperature remains unchanged or shows an upward trend within the first preset time in the future, the insulation time of the pump station cylinder 1 is predicted based on the current external ambient temperature and the current temperature when the heating supply is stopped;

[0082] If the external ambient temperature shows a downward trend within the first preset time in the future, the minimum value of the external ambient temperature and the current temperature are selected within the first preset time in the future to predict the insulation time of the pump station cylinder 1 when the heating supply is stopped;

[0083] If the external ambient temperature fluctuates within the first preset time in the future, the average value of the external ambient temperature and the current temperature are selected within the first preset time in the future to predict the insulation time of the pump station cylinder 1 when the heating is stopped.

[0084] The prediction of the insulation time fully takes into account the future change trend of the external ambient temperature to ensure the insulation time of the pump station cylinder 1 when the heating is stopped; if the external ambient temperature remains unchanged or shows an upward trend within the first preset time in the future, it indicates that the current external ambient temperature is the minimum value within the first preset time, and the current external ambient temperature and the current temperature of the pump station cylinder 1 are used for prediction. The change trend of the external ambient temperature can be obtained based on the weather forecast in the area; if the external ambient temperature shows a downward trend within the first preset time in the future, it indicates that the current external ambient temperature is the maximum value within the first preset time, and the minimum value of the external ambient temperature and the current temperature of the pump station cylinder 1 are selected within the first preset time for prediction to ensure that the predicted insulation time will be less than the actual insulation time to ensure the actual insulation time; if the external ambient temperature shows a fluctuating trend within the first preset time in the future, the average value of the external ambient temperature and the current temperature are selected within the first preset time in the future to predict the insulation time of the pump station cylinder 1 when the heating is stopped.

[0085] Furthermore, when the insulation time is less than the first preset time, the solar heat collecting device 4 or the geothermal source heating device 5 continues to heat the pump station cylinder 1, including:

[0086] Taking the moment when the current temperature is detected as the initial moment, obtaining the heat transfer coefficient of the pump station cylinder 1 at each moment within a second preset time in the future;

[0087] Based on the heat transfer coefficient at each moment, the standard deviation of the heat transfer coefficient corresponding to multiple moments within the second preset time is obtained. If the standard deviation is less than or equal to the preset value, the circulation fans A2 and B3 are both adjusted to operate at the second preset speed; if the standard deviation is greater than the preset value, the circulation fans A2 and B3 are both adjusted to operate at the first preset speed;

[0088] The second preset speed is smaller than the first preset speed.

[0089] Among them, the standard deviation of the heat transfer coefficient corresponding to multiple moments is:

[0090]

[0091] Where S is the standard deviation, is the average value of the heat transfer coefficient corresponding to multiple moments, K i is the heat transfer coefficient at the i-th moment, T i进 and T i出 are the temperatures of the air inlet and outlet of the pump station cylinder 1 at the i-th moment, T i内 and T i外 are the temperature inside the pump station cylinder 1 and the external environment temperature at the i-th moment, T i+1内is the temperature inside the pump station cylinder 1 at the i+1th moment, C is the specific heat capacity of air, ρ is the density of air, Q is the mass flow rate of circulating air (the mass flow rate of gas in the pipeline of the solar energy collector 4 or the geothermal source heating device 5), V is the volume inside the pump station cylinder 1, n is the number of multiple moments (or multiple heat transfer coefficients), i = 1, 2, ..., n.

[0092] When the heat preservation time is less than the first preset time, the solar heat collecting device 4 or the geothermal source heating device 5 continues to heat the pump station cylinder 1, in order to further save the power consumption of the circulation fan A2 and the circulation fan B3 and achieve the purpose of energy saving, the heat transfer of the pump station cylinder 1 is monitored. The heat transfer of the pump station cylinder 1 includes the heat transfer between the pump station cylinder 1 and the external environment and the heat transfer between the pump station cylinder 1 and the solar heat collecting device 4 or the geothermal source heating device 5; the heat transfer between the pump station cylinder 1 and the solar heat collecting device 4 or the geothermal source heating device 5 is the same as the heat transfer between the pump station cylinder 1 and the external environment. Heat transfer is mainly affected by the circulating gas flow rate. The greater the gas flow rate, the faster the heat transfer. Since external environmental factors are constantly changing, for example, in windy weather, the heat transfer between the pump station cylinder 1 and the external environment will be faster. Its stability is uncontrollable and changes with external conditions. Therefore, taking the above factors into consideration, the heat transfer coefficient of the pump station cylinder 1 is calculated using the above formula. The heat transfer coefficient is used to express the heating status of the pump station cylinder 1 by the solar thermal collector 4 or the geothermal source heating device 5 under changing external conditions.

[0093] Specifically, taking the moment when the current temperature is detected as the initial moment, obtaining the heat transfer coefficient of the pump station cylinder 1 at each moment within a second preset time in the future, and calculating the standard deviation of multiple heat transfer coefficients, the standard deviation of the multiple heat transfer coefficients reflecting the heat transfer stability between the pump station cylinder 1 and the external environment and the solar heat collection device 4 (or the geothermal source heating device 5) within the second preset time;

[0094] If the standard deviation is less than or equal to the preset value, it indicates that the heat transfer is relatively stable, that is, the solar thermal collector 4 or the geothermal source heating device 5 is relatively stable in providing heat under the current external conditions, and the circulating fans A2 and B3 can be adjusted to operate at the second preset speed, which is lower than the first preset speed, thereby reducing the power consumption of the circulating fans A2 and B3. At the second preset speed, the circulating heat supply can be guaranteed, which only reduces the heat exchange capacity (heat transfer) between the pump station cylinder 1 and the solar thermal collector 4 (or geothermal source heating device 5), but can ensure that the temperature inside the pump station cylinder 1 is always higher than the preset temperature, thereby ensuring the antifreeze effect.

[0095] If the standard deviation is greater than the preset value, it indicates that the heat transfer is unstable. Reducing the speed of the circulation fans A2 and B3 may cause the temperature inside the pump station cylinder 1 to fall below the preset temperature.

[0096] Through the above technical solution, the rotation speeds of the circulation fans A2 and B3 can be effectively adjusted to save electricity, thereby further achieving the purpose of energy saving.

[0097] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0098] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0099] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. An integrated pump station antifreeze ventilation system based on renewable energy, characterized in that: include: A pump station cylinder (1) is provided with a circulating fan A (2) at its air inlet and a circulating fan B (3) at its air outlet; the circulating fan A (2) is connected to the air outlet A of the solar heat collection device (4) and the air outlet B (544) of the geothermal source heating device (5) respectively through a first valve (7); the circulating fan B (3) is connected to the air inlet A of the solar heat collection device (4) and the air inlet B (543) of the geothermal source heating device (5) respectively through a second valve (8); a controller (6); the first valve (7), the second valve (8), the circulating fan A (2), the circulating fan B (3) and the geothermal source heating device (5) are all electrically connected to the controller (6).

2. The integrated pump station antifreeze ventilation system based on renewable energy according to claim 1 is characterized in that: The first valve (7) and the second valve (8) are both four-way valves; The first valve (7) comprises: a first communication port (a), a second communication port (b) connected to the air outlet B (544) of the geothermal source heating device (5), a third communication port (c) connected to the circulating fan A (2), and a fourth communication port (d) connected to the air outlet A of the solar heat collecting device (4); The second valve (8) includes: a fifth communication port (e) connected to the circulating fan B (3), a sixth communication port (f) connected to the air inlet B (543) of the geothermal source heating device (5), a seventh communication port (g), and an eighth communication port (h) connected to the air inlet A of the solar heat collection device (4).

3. The integrated pump station antifreeze ventilation system based on renewable energy according to claim 1 is characterized in that: A thermal switch (9) electrically connected to the controller (6) is provided in the pump station cylinder (1).

4. The integrated pump station antifreeze ventilation system based on renewable energy according to claim 2 is characterized in that: The solar heat collecting device (4), the circulating fan A (2), the pump station cylinder (1) and the circulating fan B (3) form a solar heat supply loop.

5. The integrated pump station antifreeze ventilation system based on renewable energy according to claim 2 is characterized in that: The geothermal source heating device (5) comprises: a vertical buried pipe (510) for heat transfer with a geothermal source, a water outlet A of the vertical buried pipe (510) being connected to a water inlet B (523) of an evaporator (520), and a water outlet B (524) of the evaporator (520) being connected to a water inlet A of the vertical buried pipe (510); the vertical buried pipe (510) and the evaporator (520) forming a buried pipe heat exchange loop, and a circulating pump (530) being provided on the buried pipe heat exchange loop; The condenser (540) has an air inlet B (543) and an air outlet B (544) arranged on the condenser (540); the heat transfer medium outlet B (526) of the evaporator (520) is connected to the heat transfer medium inlet A (545) of the condenser (540) through a compressor (550); the heat transfer medium outlet A (546) of the condenser (540) is connected to the heat transfer medium inlet B (525) of the evaporator (520) through a throttle valve (560); the evaporator (520), the compressor (550), the condenser (540) and the throttle valve (560) form a geothermal source heat pump circuit, and the condenser (540), the circulating fan A (2), the pump station cylinder (1) and the circulating fan B (3) form a geothermal source heating circuit.

6. The integrated pump station antifreeze ventilation system based on renewable energy according to claim 2 is characterized in that: The controller (6) controls the third connecting port (c), the fourth connecting port (d), the fifth connecting port (e) and the eighth connecting port (h) to be opened, and when the first connecting port (a), the second connecting port (b), the sixth connecting port (f) and the seventh connecting port (g) are closed, the geothermal source heating device (5) does not operate, and heat is supplied to the pump station cylinder (1) through the solar heat collection device (4).

7. The integrated pump station antifreeze ventilation system based on renewable energy according to claim 2, characterized in that: When the controller (6) controls the first connecting port (a), the second connecting port (b), the sixth connecting port (f) and the seventh connecting port (g) to be opened and the third connecting port (c), the fourth connecting port (d), the fifth connecting port (e) and the eighth connecting port (h) to be closed, the solar heat collecting device (4) does not operate and heat is supplied to the pump station cylinder (1) through the geothermal source heating device (5).

8. The integrated pump station antifreeze ventilation system based on renewable energy according to claim 2, characterized in that: The controller (6) controls the first communication port (a), the third communication port (c), the fifth communication port (e) and the seventh communication port (g) to be opened, and the second communication port (b), the fourth communication port (d), the sixth communication port (f) and the eighth communication port (h) to be closed, thereby ventilating the pump station cylinder (1) through the circulation fan A (2) and the circulation fan B (3).

9. The integrated pump station antifreeze ventilation system based on renewable energy according to claim 1, characterized in that: A first temperature sensor electrically connected to the controller is provided in the pump station cylinder (1), and a second temperature sensor and a third temperature sensor electrically connected to the controller are provided at the air inlet and the air outlet of the pump station cylinder (1), respectively; During the process of the solar heat collecting device (4) or the geothermal source heating device (5) providing heat to the pump station cylinder (1), the circulating fan A (2) and the circulating fan B (3) both operate at a first preset speed, and the temperature inside the pump station cylinder (1) is monitored in real time by the first temperature sensor; If the first temperature sensor detects that the current temperature in the pump station cylinder (1) is higher than a preset temperature, the heat preservation time of the pump station cylinder (1) is predicted in the case of stopping the heat supply based on the change of the external environment temperature within the first preset time in the future, the current external environment temperature and the current temperature; If the heat preservation time is greater than or equal to the first preset time, the heating is stopped; If the heat preservation time is less than the first preset time, the solar heat collecting device (4) or the ground heat source heating device (5) is used to continue to supply heat to the pump station cylinder (1); The heat preservation time is the time required for the pump station cylinder (1) to drop from the current temperature to the preset temperature.

10. The integrated pump station antifreeze ventilation system based on renewable energy according to claim 9, characterized in that: Based on the change of the external environment temperature within a first preset time in the future, the current external environment temperature and the current temperature, the heat preservation time of the pump station cylinder (1) is predicted when the heat supply is stopped, including: If the external ambient temperature remains unchanged or shows an upward trend within a first preset time in the future, the insulation time of the pump station cylinder (1) is predicted based on the current external ambient temperature and the current temperature when the heat supply is stopped; If the external environment temperature shows a downward trend within a first preset time in the future, the minimum value of the external environment temperature and the current temperature within the first preset time in the future are selected to predict the heat preservation time of the pump station cylinder (1) when the heat supply is stopped; If the external ambient temperature shows a fluctuating trend within the first preset time in the future, the average value of the external ambient temperature and the current temperature are selected within the first preset time in the future to predict the insulation time of the pump station cylinder (1) when the heat supply is stopped.

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