A series-connected energy-saving water pump system and control method for the water source side of a water source heat pump

Abstract

The present invention discloses a water source heat pump water source side series energy-saving water pump system and a control method. The system includes a water intake well and a water return well. A submersible pump mechanism is arranged in the water intake well. A heat pump unit connected to the submersible pump mechanism is arranged between the water intake well and the water return well. An energy-saving water pump system is connected in series between the submersible pump mechanism and the water return well. The method is as follows: The control unit preset the system flow rate and turn on the submersible main path, the circulation branch path, and the sand removal main path, and collect the flow rate value in real time and judge whether the flow rate value is continuously greater than the preset flow rate. If it is greater, turn on the submersible branch path and the circulation main path, and judge whether the flow rate value is continuously and stably greater than the preset flow rate. If so, turn off the submersible main path and the circulation branch path, and judge whether the flow rate values are the same and greater than the preset flow rate; if they are the same and greater, turn on the heat pump unit, and judge again whether the flow rate values are the same and greater than the preset flow rate. If they are the same and greater, the system is normal, otherwise, the system turns off the heat pump unit and alarms. It has the advantages of energy saving and flexible adjustment.

Description

Technical Field

[0001] The invention belongs to the technical field of groundwater source heat pumps, and particularly relates to a series-connected energy-saving water pump system and a control method for the water source side of a water source heat pump. Background Art

[0002] Since groundwater source heat pump units have been widely used in the domestic air-conditioning engineering field since the 20th century, due to their particularity, they have become the main form of air-conditioning systems in North China and the Central Plains. The heat source of the groundwater source heat pump system is the groundwater extracted from wells or abandoned mines. The groundwater after heat exchange can be discharged into the surface water system, but for larger application projects, it is usually required to recharge the groundwater into the original groundwater layer through a recharge well. Since the underground water temperature is basically constant throughout the year, it is lower than the outdoor air temperature in summer and higher than the outdoor temperature in winter, and it has a large heat capacity. Therefore, the efficiency of the groundwater heat pump system is higher than that of the air source heat pump, and the COP is generally between 4 and 6, and there are no problems such as frosting. In recent years, the groundwater source heat pump system has developed rapidly in China.

[0003] However, due to the need to extract deep groundwater, the groundwater source heat pump has the problem of high energy consumption of submersible pumps. The high energy consumption of submersible pumps is mainly because when the system is running normally, in addition to overcoming the local and frictional resistance of the system, the submersible pump also has to bear the gravity head difference of the water from the position of the submersible pump to the ground. Due to the existence of this gravity head difference of the water, the submersible pump has been in a high-energy consumption operation state, resulting in high energy consumption of the groundwater source heat pump unit. At present, the methods for energy conservation of groundwater source heat pumps by domestic and foreign scholars are mainly through well number adjustment and variable frequency pump adjustment. However, the adjustment ranges of these two methods are limited at present. When adjusting the well number, it is required to have multiple water intake wells, and the adjustment range is small. When multiple wells take water simultaneously, there will be certain losses due to the parallel connection of submersible pumps. Although the variable frequency adjustment of the water pump can reduce the power to a certain extent, the water intake flow rate and the head change correspondingly, and the adjustment range of the flow rate is relatively narrow, and the energy-saving effect is limited. Summary of the Invention

[0004] To solve the above technical problems, the invention provides a series-connected energy-saving water pump system and a control method for the water source side of a water source heat pump.

[0005] A series-connected energy-saving water pump system for the water source side of a water source heat pump includes a water intake well and a recharge well. A submersible pump mechanism is arranged in the water intake well. A heat pump unit connected to the submersible pump mechanism is arranged between the water intake well and the recharge well. An energy-saving water pump system is connected in series between the submersible pump mechanism and the recharge well. The energy-saving water pump system includes a control unit and a ground circulation pump unit. The ground circulation pump unit is connected in series between the submersible pump mechanism and the heat pump unit. A first flowmeter is connected in series between the ground circulation pump unit and the submersible pump mechanism. The submersible pump mechanism, the first flowmeter, the ground circulation pump unit, and the heat pump unit are all electrically connected to the control unit.

[0006] The energy-saving water pump system further includes a sand removal mechanism and a second flowmeter. The submersible pump mechanism, the first flowmeter, the above-ground circulation pump unit, the sand removal mechanism, the heat pump unit, and the second flowmeter are all connected in series in sequence through a conveying pipeline. A sewage drainage mechanism is bypass-connected to the conveying pipeline between the first flowmeter and the wellhead of the water intake well. A sewage drainage mechanism is bypass-connected to the conveying pipeline between the heat pump unit and the second flowmeter. The sewage drainage mechanism includes a sewage pipe and a sewage solenoid valve connected in series on the sewage pipe. The sewage solenoid valve and the second flowmeter are both electrically connected to the control unit.

[0007] The above-ground circulation pump unit includes a main circulation path and a branch circulation path. The two ends of the main circulation path are respectively provided with a circulation water inlet end and a circulation water outlet end. The circulation water inlet end is connected to the first flowmeter through a conveying pipeline. The circulation water outlet end is connected to the sand removal mechanism through a conveying pipeline. A circulation water inlet solenoid valve is provided at the circulation water inlet end, and a circulation water outlet solenoid valve is provided at the circulation water outlet end. An above-ground circulation pump is connected in series between the circulation water inlet solenoid valve and the circulation water outlet solenoid valve.

[0008] The two ends of the main circulation path are connected in parallel with a branch circulation path. The branch circulation path includes a branch circulation pipe and a branch circulation solenoid valve provided on the branch circulation pipe. The branch circulation solenoid valve, the circulation water inlet solenoid valve, the circulation water outlet solenoid valve, and the above-ground circulation pump are all electrically connected to the control unit.

[0009] The sand removal mechanism includes a main sand removal path and a bypass sand removal path. The main sand removal path is connected in parallel with the bypass sand removal path. The bypass sand removal path includes a bypass branch pipe and a bypass valve provided on the bypass branch pipe. A sand removal device is provided on the main sand removal path. The sand removal device is provided with a sand removal input port and a sand removal output port. A sand removal inlet valve is provided at the sand removal input port, and a sand removal outlet valve is provided at the sand removal output port. The sand removal inlet valve is connected to the above-ground circulation pump unit through a conveying pipeline. The sand removal outlet valve is connected to the heat pump unit through a conveying pipeline. The sand removal device is a hydrocyclone.

[0010] The submersible pump mechanism includes a main submersible path and a branch submersible path. The main submersible path and the branch submersible path are connected in parallel. The main submersible path includes a submersible pump water intake pipe and a submersible pump. A submersible solenoid valve is provided on the submersible pump water intake pipe. The submersible solenoid valve is connected in series with the submersible pump through the submersible pump water intake pipe. A submersible branch solenoid valve is provided on the branch submersible path. Both the submersible branch solenoid valve and the submersible solenoid valve are connected to the conveying pipeline. The submersible pump, the submersible solenoid valve, and the submersible branch solenoid valve are all electrically connected to the control unit. The first flowmeter is provided with a first flow inlet and a first flow outlet. The first flow outlet is connected in series with the above-ground circulating pump unit through the conveying pipeline. A first flow solenoid valve is provided on the first flow inlet. A water conveyance switch solenoid valve is connected in series on the conveying pipeline between the first flow solenoid valve and the wellhead of the water intake well. Both the water conveyance switch solenoid valve and the first flow solenoid valve are electrically connected to the control unit.

[0011] The second flowmeter is provided with a second flow inlet and a second flow outlet. The second flow outlet is connected to the return water well through the conveying pipeline. A second flow solenoid valve is provided on the second flow inlet. The second flow solenoid valve is connected in series with the second flowmeter through the conveying pipeline. The heat pump unit is provided with a heat pump unit water inlet and a heat pump unit water outlet. A heat pump unit water inlet solenoid valve is provided on the heat pump unit water inlet. A heat pump unit water outlet solenoid valve is provided on the heat pump unit water outlet. The heat pump unit water inlet solenoid valve is connected to the sand removal mechanism through the conveying pipeline. The heat pump unit water outlet solenoid valve is connected to the second flow solenoid valve through the conveying pipeline. An automatic exhaust valve is provided at the highest point of the conveying pipeline. The second flow solenoid valve, the heat pump unit water inlet solenoid valve, and the heat pump unit water outlet solenoid valve are all electrically connected to the control unit.

[0012] A control method for an energy-saving water pump system in series on the water source side of a water source heat pump includes the following steps:

[0013] Step 1: The control unit sets the preset flow rate Q of the system and preprocesses the energy-saving water pump system.

[0014] Step 2: When the control unit detects that the system flow rate value is greater than the preset flow rate Q, if it is greater, the branch submersible path and the main circulation path are opened.

[0015] Step 3: The control unit closes the main submersible path and detects whether the system flow rate value is greater than the preset flow rate Q. If it is greater, the control unit starts the heat pump unit.

[0016] Step 4: When the heat pump unit is running, the control unit detects whether the system flow rate is greater than the preset flow rate Q. If it is greater, the system operates normally; otherwise, the system has an operating fault, and the control unit shuts down the heat pump unit and gives an alarm.

[0017] In Step 1, the pre-treatment includes that the control unit turns on the sewage drainage mechanism to drain the conveying pipeline. After sewage drainage, the control unit turns off the sewage drainage mechanism and turns on the main submersible path, the circulating branch, the main sand removal path, and each electromagnetic valve connected in series with the conveying pipeline.

[0018] The steps for the control unit to detect whether the system flow rate is greater than the preset flow rate Q are as follows:

[0019] A1): The control unit collects the flow rate values of the first flow meter and the second flow meter in real time.

[0020] A2): The control unit determines whether the flow rate values of the first flow meter and the second flow meter collected are the same. If they are the same, it proceeds to Step A3). If they are different, the control unit controls the system to stop running.

[0021] A3): The control unit numerically compares the flow rate value of the first flow meter or the second flow meter with the preset flow rate Q.

[0022] The present invention discloses a water source heat pump water source side series-connected energy-saving water pump system and a control method. An above-ground circulating unit and a sand removal mechanism are additionally arranged in the system. At the initial stage of the operation of the heat pump system, the submersible pump and the circulating branch are turned on to make the system flow rate reach the preset flow rate. When the water flow in the system circulates normally and stably between the water intake well and the water return well, the above-ground circulating pump is turned on at this time. After the water flow runs stably for a period of time, the submersible pump and the circulating branch are turned off. After the submersible pump is turned off, if the flow rate in the system can still reach the preset flow rate, the heat pump unit is turned on to make the heat pump system operate normally. After the system operates stably, the water intake point and the water return point are on the same horizontal plane, and the water pump only needs to overcome the local resistance, the frictional resistance of the pipeline, and the resistance between the equipment connected by the pipeline, so that the resistance that the water pump needs to overcome is reduced. Therefore, there is no need to use a high-lift submersible pump anymore, and an above-ground circulating pump is used to realize the stable circulation of the water flow in the system, which has the advantage of energy saving. In addition, a sand removal mechanism and a sewage drainage mechanism are arranged in the system, and removing sand and the residual water in the pipeline can further reduce the resistance of the water flow in the pipeline to save energy consumption. Moreover, a control unit and various electromagnetic valves are arranged in the system, which can achieve the beneficial effect of flexible adjustment. Description of the Drawings

[0023] Figure 1 is the overall structural schematic diagram of the water source heat pump water source side series-connected energy-saving water pump system.

[0024] Figure 2 is the specific structural schematic diagram of the water source heat pump water source side series-connected energy-saving water pump system. Detailed Embodiment

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] As Figure 1 shown, a water source heat pump water source side series energy-saving water pump system includes a water intake well 2 and a water return well 6. A submersible pump mechanism 1 is arranged in the water intake well 2. A heat pump unit 5 connected to the submersible pump mechanism 1 is arranged between the water intake well 2 and the water return well 6. An energy-saving water pump system is connected in series between the submersible pump mechanism 1 and the water return well 6.

[0027] The energy-saving water pump system includes a control unit and a ground circulation pump unit 4. The ground circulation pump unit 4 is connected in series between the submersible pump mechanism 1 and the heat pump unit 5. A first flowmeter 3 is connected in series between the ground circulation pump unit 4 and the submersible pump mechanism 1. The submersible pump mechanism 1, the first flowmeter 3, the ground circulation pump unit 4 and the heat pump unit 5 are all electrically connected to the control unit.

[0028] The control unit can be any one of a single-chip microcomputer, a PLC, an industrial computer or a PC. Preferably, the control unit is a single-chip microcomputer for control. The single-chip microcomputer has the characteristics of low power consumption, low price and convenient control. The model of the single-chip microcomputer is preferably STM32. STM32 is a processor with an ARM architecture and is a high-performance, low-cost and low-power microcontroller. STM32 has an embedded Flash memory and a RAM memory, which can be used to store programs and data. The control unit in this system can temporarily store the flow values of the first flowmeter 3 and the second flowmeter 9 collected in the RAM memory and compare and judge them with the preset flow values stored in the control unit. In addition, the STM32 microcontroller also has rich input and output ports, which can be used for the opening and closing control of various solenoid valves in this system.

[0029] As Figure 2As shown in the figure, the energy-saving water pump system further includes a sand removal mechanism 7 and a second flowmeter 9. The submersible pump mechanism 1, the first flowmeter 3, the above-ground circulation pump unit 4, the sand removal mechanism 7, the heat pump unit 5, and the second flowmeter 9 are all connected in series in sequence through a conveying pipeline 16. A sewage drainage mechanism 8 is connected in parallel on the conveying pipeline 16 between the first flowmeter 3 and the wellhead of the water intake well 2. A sewage drainage mechanism 8 is connected in parallel on the conveying pipeline 16 between the heat pump unit 5 and the second flowmeter 9. The sewage drainage mechanism 8 includes a sewage pipe 802 and a sewage solenoid valve 801 connected in series on the sewage pipe 802. Both the sewage solenoid valve 801 and the second flowmeter 9 are electrically connected to the control unit. The sewage drainage mechanism 8 is respectively arranged at the wellhead of the water intake well 2 and the wellhead of the return well 6. Before the energy-saving water pump system starts to operate, the sewage drainage mechanism 8 can be opened to discharge the residual water existing in the conveying pipeline 16 from the sewage pipe 802, reducing the residual water volume in the pipeline 16 and reducing the resistance in the pipeline for the normal operation of the energy-saving water pump system. Moreover, the sewage drainage mechanism 8 can also be opened after the energy-saving water pump system stops operating to discharge the water in the conveying pipeline 16 through the sewage pipe 802, which can prevent the water in the conveying pipeline 16 from freezing the pipeline in winter and reducing the number of pipeline repairs.

[0030] The above-ground circulation pump unit 4 includes a main circulation path 401 and a branch circulation path 405. Both ends of the main circulation path 401 are respectively provided with a circulation water inlet end and a circulation water outlet end. The circulation water inlet end is connected to the first flowmeter 3 through the conveying pipeline 16. The circulation water outlet end is connected to the sand removal mechanism 7 through the conveying pipeline 16. A circulation water inlet solenoid valve 402 is arranged on the circulation water inlet end. A circulation water outlet solenoid valve 404 is arranged on the circulation water outlet end. An above-ground circulation pump 403 is connected in series between the circulation water inlet solenoid valve 402 and the circulation water outlet solenoid valve 404. The opening and closing of the main circulation path 401 are realized by the opening and closing of the circulation water inlet solenoid valve 402, the circulation water outlet solenoid valve 404, and the above-ground circulation pump 403. The model of the above-ground circulation pump 403 can be determined by calculating the local resistance, the frictional resistance, and the system preset flow rate Q between the water intake well 2 and the return well 6.

[0031] A branch circulation path 405 is connected in parallel to both ends of the main circulation path 401. The branch circulation path 405 includes a branch circulation pipe 406 and a branch circulation solenoid valve 407 arranged on the branch circulation pipe 406. The branch circulation solenoid valve 407, the circulation water inlet solenoid valve 402, the circulation water outlet solenoid valve 404, and the above-ground circulation pump 403 are all electrically connected to the control unit.

[0032] When the main circulation path 401 is not opened, the branch circulation path 405 is in an open state to ensure the normal circulation of the water pumped out from the submersible pump 104 in the entire system. When the main circulation path 401 is opened and the water flow in the system reaches a stable state, the branch circulation path 405 is in a closed state.

[0033] The sand removal mechanism 7 includes a main sand removal path 701 and a bypass sand removal path 705. The main sand removal path 701 is connected in parallel with the bypass sand removal path 705. The bypass sand removal path 705 includes a bypass branch pipe 707 and a bypass valve 706 provided on the bypass branch pipe 707. A sand removal device 703 is provided on the main sand removal path 701. The sand removal device 703 is provided with a sand removal input port and a sand removal output port. A sand removal inlet valve 702 is provided on the sand removal input port, and a sand removal outlet valve 704 is provided on the sand removal output port. The sand removal inlet valve 702 is connected to the above-ground circulation pump unit 4 through a conveying pipeline 16, and the sand removal outlet valve 704 is connected to the heat pump unit 5 through the conveying pipeline 16. The sand removal device 703 is a cyclone sand separator. The cyclone sand separator is made according to the principle of centrifugal sedimentation and density difference when solid particles in the fluid rotate in the sand separator. When the water flow enters the cyclone sand separator tangentially from the water inlet of the cyclone sand separator under a certain pressure, a strong rotational motion is generated. Due to the different densities of sand and water, under the combined action of centrifugal force, centripetal force, buoyancy, and fluid drag force, the water with a lower density rises and is discharged from the water outlet, and the sand particles with a higher density are discharged from the sewage outlet at the bottom of the device, so as to achieve the purpose of sand removal. The cyclone sand separator integrates cyclone and filtration, and has remarkable effects such as sand removal, turbidity removal, and solid-liquid separation in the water treatment field, and has the advantages of high sand removal rate, saving installation space, and stable working state.

[0034] The submersible pump mechanism 1 includes a main submersible path 101 and a branch submersible path 105. The main submersible path 101 and the branch submersible path 105 are connected in parallel. The main submersible path 101 includes a submersible pump water intake pipe 103 and a submersible pump 104. A submersible solenoid valve 102 is provided on the submersible pump water intake pipe 103. The submersible solenoid valve 102 is connected in series with the submersible pump 104 through the submersible pump water intake pipe 103. A branch submersible solenoid valve 106 is provided on the branch submersible path 105. Both the branch submersible solenoid valve 106 and the submersible solenoid valve 102 are connected to the conveying pipeline 16. The submersible pump 104, the submersible solenoid valve 102, and the branch submersible solenoid valve 106 are all electrically connected to the control unit.

[0035] The model of the submersible pump 104 can be determined by calculating the local resistance, frictional resistance between the water intake well 2 and the water return well 6, the gravitational head from the water intake well 2 to the ground, the kinetic energy head of the water flow in the pipe, and the preset flow rate Q of the system.

[0036] In the initial stage of the operation of the energy-saving water pump system, first open the submersible main path 101 to make the submersible pump 104 work. The submersible pump 104 pumps the water in the water intake well 2 through the conveying pipeline 16 and then returns it to the return well 6. When the energy-saving water pump system reaches the required water flow and maintains stability, the control unit opens the circulating main path 401. When the system flow reaches stability again, the control unit closes the circulating branch 405 and the submersible main path 101, and at the same time opens the submersible branch 105. At this time, the water in the water intake well 2 is sucked out through the submersible branch 105 and the above-ground circulating pump 403 on the circulating main path 401 and then returns to the return well 6. The head of the above-ground circulating pump 403 is less than the head of the submersible pump 104. After the water flow system in the system maintains stability, the submersible pump 104 is turned off, and the low-head above-ground circulating pump 403 is used to reduce the energy consumption of the submersible pump.

[0037] A flow first inlet and a flow first outlet are provided on the first flowmeter 3. The flow first outlet is connected in series with the above-ground circulating pump unit 4 through the conveying pipeline 16. A first flow solenoid valve 14 is provided on the flow first inlet. A water delivery switch solenoid valve 15 is connected in series on the conveying pipeline 16 between the first flow solenoid valve 14 and the wellhead of the water intake well 2. Both the water delivery switch solenoid valve 15 and the first flow solenoid valve 14 are electrically connected to the control unit.

[0038] A flow second inlet and a flow second outlet are provided on the second flowmeter 9. The flow second outlet is connected to the return well 6 through the conveying pipeline 16. A second flow solenoid valve 10 is provided on the flow second inlet. The second flow solenoid valve 10 is connected in series with the second flowmeter 9 through the conveying pipeline 16. A heat pump unit water inlet and a heat pump unit water outlet are provided on the heat pump unit 5. A heat pump unit water inlet solenoid valve 12 is provided on the heat pump unit water inlet. A heat pump unit water outlet solenoid valve 11 is provided on the heat pump unit water outlet. The heat pump unit water inlet solenoid valve 12 is connected to the sand removal mechanism 7 through the conveying pipeline 16. The heat pump unit water outlet solenoid valve 11 is connected to the second flow solenoid valve 10 through the conveying pipeline 16. An automatic air vent valve 13 is provided at the highest point of the position of the conveying pipeline. Both the second flow solenoid valve 10, the heat pump unit water inlet solenoid valve 12 and the heat pump unit water outlet solenoid valve 11 are electrically connected to the control unit. The automatic air vent valve 13 is a device for exhausting air, a valve for releasing the cavitation generated in the water supply pipeline. The automatic air vent valve 13 removes the gas in the pipeline and avoids the water flow in the pipeline running with air.

[0039] The first flowmeter 3 and the second flowmeter 9 are electromagnetic flowmeters. The electromagnetic flowmeter is an electromagnetic flowmeter with RS485 communication. The electromagnetic flowmeter can realize the real-time transmission of the water flow to the control unit through the RS484 communication protocol to achieve the purpose of flow acquisition.

[0040] The control unit is a single-chip microcomputer, and input or output ports are provided on the single-chip microcomputer. The output ports on the single-chip microcomputer are respectively electrically connected to the diving branch solenoid valve 106, the diving solenoid valve 102, the water supply switch solenoid valve 15, the first flow solenoid valve 14, the sewage solenoid valve 801, the circulating water inlet solenoid valve 402, the circulating water outlet solenoid valve 404, the branch circulating solenoid valve 407, the heat pump unit water inlet solenoid valve 12, the heat pump unit water outlet solenoid valve 11, and the second flow solenoid valve 10. A solenoid valve is an industrial device controlled by electricity and can be used to control fluid automation components. A solenoid valve uses electromagnetic principles to open or close a valve. When the solenoid valve is powered on, the electromagnetic coil inside the solenoid valve generates an electromagnetic force to lift the valve core from the valve seat, and the valve opens. When powered off, the electromagnetic force disappears, and the valve core resets to close the valve. The single-chip microcomputer can send on-off signals, that is, high-level or low-level signals, to the solenoid valve through the output port to open or close the solenoid valve.

[0041] A control method for a water source heat pump water source side series energy-saving water pump system includes the following steps:

[0042] Step 1: The control unit sets the preset flow rate Q of the system and preprocesses the energy-saving water pump system;

[0043] Step 2: When the control unit detects that the system flow rate value is greater than the preset flow rate Q, if it is greater, the diving branch and the main circulation path are opened;

[0044] Step 3: The control unit closes the main diving path and detects whether the system flow rate value is greater than the preset flow rate Q. If it is greater, the control unit starts the heat pump unit;

[0045] Step 4: When the heat pump unit is running, the control unit detects whether the system flow rate is greater than the preset flow rate Q. If it is greater, the system runs normally; otherwise, the system has a malfunction, and the control unit shuts down the heat pump unit and gives an alarm.

[0046] In Step 1, the preprocessing includes that the control unit starts the sewage draining mechanism to drain sewage from the conveying pipeline. After draining the sewage, the control unit closes the sewage draining mechanism and opens the main diving path, the circulating branch path, the main sand removal path, and each solenoid valve connected in series with the conveying pipeline;

[0047] The control unit detecting whether the system flow rate value is greater than the preset flow rate Q includes the following steps:

[0048] A1): The control unit real-time collects the flow rate values of the first flowmeter and the second flowmeter;

[0049] A2): The control unit determines whether the flow rate values of the first flowmeter and the second flowmeter collected are the same. If they are the same, it proceeds to Step A3). If they are different, the control unit controls the system to stop running

[0050] A3): The control unit numerically compares the flow rate value of the first flowmeter or the second flowmeter with the preset flow rate Q.

[0051] The alarm in step 4 is implemented by an alarm device. The alarm device is an audible and visual alarm, which is an alarm signal device that can send warning signals to people through sounds and various lights. The audible and visual alarm is electrically connected to the control unit. When the control unit detects that the first flowmeter or the second flowmeter is different or lower than the preset flow rate value Q, the control unit sends a high-level or low-level signal to the audible and visual alarm to drive it to give an alarm.

[0052] Normally, the flow rate values of the first flowmeter 3 and the second flowmeter 9 in the energy-saving water pump system are the same. However, when the circulating capacity of the ground circulation pump 403 is weak, and the water flowing out of the water intake well 2 cannot completely flow back to the water return well 6, at this time, the flow rate values of the first flowmeter 3 and the second flowmeter 9 are different, and the control unit drives the audible and visual alarm to give an alarm reminder to alert the staff to pay attention.

[0053] Another alarm situation is that the flow rate value in the first flowmeter 3 or the second flowmeter 9 is lower than the preset flow rate value Q. If the flow rate value in the energy-saving water pump system is lower than the preset flow rate value Q, at this time, the water flow rate in the internal circulation of the heat pump unit 5 is small, which is not enough to enable the heat pump unit 5 to complete the heat exchange work, and when the water flow rate is small, it is also easy to cause damage to the heat pump unit itself.

[0054] The specific working process of the water source heat pump water source side series energy-saving water pump system is as follows:

[0055] When the system has not started running, since all the solenoid valves are not energized, all the solenoid valves in the system are in the closed state. Before the system starts running, the preset flow rate value Q in the energy-saving water pump system is written into the memory of the control unit through a programmer. When the system starts running, the control unit opens the sewage solenoid valve 801 to discharge the residual water in the conveying pipeline 16 after the last run through the sewage pipe 802. After the control unit times for one minute or two minutes, it closes the sewage solenoid valve 801.

[0056] After the control unit closes the sewage solenoid valve 801, manually open the sand removal inlet valve 702, the sand removal outlet valve 704, and close the bypass valve 706. The valves in the sand removal mechanism 7 are all manually controlled. When it is necessary to replace the sand removal device 703, the bypass valve 706 can be manually opened, and at the same time, the sand removal inlet valve 702 and the sand removal outlet valve 704 are closed, so that the water flow can flow out from the sand removal bypass 705 to ensure the normal operation of the system.

[0057] Subsequently, the control unit issues a high-level or low-level signal to turn on the water supply switch solenoid valve 15, the submersible solenoid valve 102, the submersible pump 104, the first flow solenoid valve 14, the branch circulation solenoid valve 407, the heat pump unit inlet solenoid valve 12, the heat pump unit outlet solenoid valve 11, and the second flow solenoid valve 10. At this time, the submersible pump 104 pumps the water in the water intake well 2 through the delivery pipeline 16 and flows through the first flowmeter 3 into the circulation branch 405. The water flowing out of the circulation branch 405 undergoes sand removal through the main sand removal path 701. After sand removal, the water flows through the heat pump unit 5. At this time, the heat pump unit 5 is not turned on and cannot perform heat exchange, but the inflow or outflow of water can occur. The water flowing out of the heat pump unit 5 flows into the return well 6 through the second flowmeter 9, completing the process of water flowing from the water intake well 2 to the return well 6. During this process, the control unit collects the flow values of the first flowmeter 3 and the second flowmeter 9 in real time through RS485 communication. If the values of the first flowmeter 3 and the second flowmeter 9 continuously and stably exceed the preset flow rate Q, the control unit turns on the submersible branch solenoid valve 106, the circulation inlet solenoid valve 402, and the circulation outlet solenoid valve 404.

[0058] After the submersible branch solenoid valve 106, the circulation inlet solenoid valve 402, and the circulation outlet solenoid valve 404 are turned on, the water pumped out by the submersible pump 104 flows through the delivery pipeline 16, through the first flowmeter 3, the main circulation path 401, and the circulation branch 405. Then the water flows into the main sand removal path 701 for sand removal. After sand removal, the water flows through the heat pump unit 5. At this time, the heat pump unit 5 is not turned on and cannot perform heat exchange, but the inflow or outflow of water can occur. The water flowing out of the heat pump unit 5 flows into the return well 6 through the second flowmeter 9, completing the process of water flowing from the water intake well 2 to the return well 6. During this process, the control unit collects in real time whether the values of the first flowmeter 3 and the second flowmeter 9 continuously and stably exceed the preset flow rate Q. If they continuously and stably exceed, the control unit closes the submersible main path 101 and the circulation branch 407.

[0059] After the submersible main path 101 and the circulation branch 407 are closed, the above-ground circulation pump 403 in the main circulation path 401 takes out water from the water intake well 2 through the submersible branch 105, and then undergoes sand removal through the main sand removal path 701. After sand removal, the water flows through the heat pump unit 5 and the second flowmeter 9 into the return well 6. At this time, the control unit collects whether the flow values in the first flowmeter 3 and the second flowmeter 9 are continuously stable and greater than the preset flow rate Q. If greater, the control unit turns on the heat pump unit 5 so that the heat pump unit 5 completes the heat exchange work.

[0060] After the heat pump unit 5 is turned on, the control unit collects the flow values in the first flowmeter 3 and the second flowmeter 9 in real time, and determines whether the flow values in the first flowmeter 3 and the second flowmeter 9 are continuously stable and greater than the preset flow rate Q. If they are stable and greater, it indicates that the system is working normally. If the first flow value 3 or the second flow value 9 is different, it indicates that the ground circulation pump 403 has failed, and the control unit issues an alarm signal. If the first flow value 3 and the second flow value 9 are less than the preset flow rate Q, the water flow required for heat exchange of the heat pump unit 5 cannot be satisfied, and the control unit also issues an alarm signal to avoid damage to the heat pump unit 5.

[0061] The technical means disclosed in the solution of the present invention are not limited to the technical means disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present invention.

Claims

1. A series energy-saving water pump system on the water source side of a water source heat pump, comprising a water intake well (2) and a water return well (6). A submersible pump mechanism (1) is arranged in the water intake well (2). A heat pump unit (5) connected to the submersible pump mechanism (1) is arranged between the water intake well (2) and the water return well (6). It is characterized in that: An energy-saving pump system is connected in series between the submersible pump mechanism (1) and the return water well (6); the energy-saving pump system includes a control unit and a ground circulation pump unit (4), the ground circulation pump unit (4) is connected in series between the submersible pump mechanism (1) and the heat pump unit (5), a first flowmeter (3) is connected in series between the ground circulation pump unit (4) and the submersible pump mechanism (1), and the submersible pump mechanism (1), the first flowmeter (3), the ground circulation pump unit (4) and the heat pump unit (5) are all electrically connected to the control unit; The ground circulation pump unit (4) includes a circulation main path (401) and a circulation branch path (405). Both ends of the circulation main path (401) are respectively provided with a circulation water inlet end and a circulation water outlet end. The circulation water inlet end is connected to the first flowmeter (3) through a conveying pipeline (16), the circulation water outlet end is connected to the sand removal mechanism (7) through a conveying pipeline (16), a circulation water inlet solenoid valve (402) is arranged on the circulation water inlet end, a circulation water outlet solenoid valve (404) is arranged on the circulation water outlet end, and a ground circulation pump (403) is connected in series between the circulation water inlet solenoid valve (402) and the circulation water outlet solenoid valve (404); The submersible pump mechanism (1) includes a submersible main path (101) and a submersible branch path (105). The submersible main path (101) and the submersible branch path (105) are connected in parallel. The submersible main path (101) includes a submersible pump water intake pipe (103) and a submersible pump (104). A submersible solenoid valve (102) is arranged on the submersible pump water intake pipe (103), the submersible solenoid valve (102) is connected in series with the submersible pump (104) through the submersible pump water intake pipe (103), a submersible branch solenoid valve (106) is arranged on the submersible branch path (105), both the submersible branch solenoid valve (106) and the submersible solenoid valve (102) are connected to the conveying pipeline (16), and the submersible pump (104), the submersible solenoid valve (102) and the submersible branch solenoid valve (106) are all electrically connected to the control unit; The control method for the energy-saving pump system connected in series on the water source side of the water source heat pump includes the following steps: Step 1: The control unit sets the preset flow rate Q of the system and preprocesses the energy-saving pump system; Step 2: When the control unit detects whether the system flow rate value is greater than the preset flow rate Q, if it is greater, then open the submersible branch path and the circulation main path; Step 3: The control unit closes the submersible main path and detects whether the system flow rate value is greater than the preset flow rate Q. If it is greater, the control unit turns on the heat pump unit; Step 4: When the heat pump unit is running, the control unit detects whether the system flow rate is greater than the preset flow rate Q. If it is greater, the system runs normally; otherwise, the system has an operation failure, and the control unit turns off the heat pump unit and alarms.

2. The water source heat pump water source side series energy-saving water pump system according to claim 1, characterized in that: The energy-saving water pump system further includes a sand removal mechanism (7) and a second flowmeter (9). The submersible pump mechanism (1), the first flowmeter (3), the above-ground circulation pump unit (4), the sand removal mechanism (7), the heat pump unit (5), and the second flowmeter (9) are all connected in series in sequence through a conveying pipeline (16). A sewage discharge and drainage mechanism (8) is bypass-connected to the conveying pipeline (16) between the first flowmeter (3) and the wellhead of the water intake well (2). A sewage discharge and drainage mechanism (8) is bypass-connected to the conveying pipeline (16) between the heat pump unit (5) and the second flowmeter (9). The sewage discharge and drainage mechanism (8) includes a sewage discharge pipe (802) and a sewage discharge solenoid valve (801) connected in series on the sewage discharge pipe (802). The sewage discharge solenoid valve (801) and the second flowmeter (9) are both electrically connected to the control unit.

3. The water source side series energy-saving water pump system of the water source heat pump according to claim 1, characterized in that: Both ends of the main circulation path (401) are connected in parallel with a circulation branch path (405). The circulation branch path (405) includes a circulation branch pipe (406) and a branch path circulation solenoid valve (407) provided on the circulation branch pipe (406). The branch path circulation solenoid valve (407), the circulation inlet solenoid valve (402), the circulation outlet solenoid valve (404), and the above-ground circulation pump (403) are all electrically connected to the control unit.

4. The water source heat pump water source side series energy-saving water pump system according to claim 2, wherein: The sand removal mechanism (7) includes a main sand removal path (701) and a sand removal bypass (705). The main sand removal path (701) is connected in parallel with the sand removal bypass (705). The sand removal bypass (705) includes a bypass branch pipe (707) and a bypass valve (706) provided on the bypass branch pipe (707). A sand removal device (703) is provided on the main sand removal path (701). The sand removal device (703) is provided with a sand removal input port and a sand removal output port. A sand removal inlet valve (702) is provided on the sand removal input port. A sand removal outlet valve (704) is provided on the sand removal output port. The sand removal inlet valve (702) is connected to the above-ground circulation pump unit (4) through a conveying pipeline (16). The sand removal outlet valve (704) is connected to the heat pump unit (5) through a conveying pipeline (16). The sand removal device (703) is a cyclone sand separator.

5. The water source heat pump water source side series energy-saving water pump system according to claim 2, wherein: The first flowmeter (3) is provided with a first flow inlet and a first flow outlet. The first flow outlet is connected in series with the above-ground circulation pump unit (4) through a conveying pipeline (16). A first flow solenoid valve (14) is provided on the first flow inlet. A water conveyance switch solenoid valve (15) is connected in series on the conveying pipeline (16) between the first flow solenoid valve (14) and the wellhead of the water intake well (2). The water conveyance switch solenoid valve (15) and the first flow solenoid valve (14) are both electrically connected to the control unit.

6. The water source heat pump water source side series energy-saving water pump system according to claim 2, characterized in that: A second flowmeter (9) is provided with a second flow inlet and a second flow outlet. The second flow outlet is connected to a water return well (6) through a delivery pipeline (16). A second flow solenoid valve (10) is provided on the second flow inlet. The second flow solenoid valve (10) is connected in series with the second flowmeter (9) through the delivery pipeline (16). A heat pump unit (5) is provided with a heat pump unit water inlet and a heat pump unit water outlet. A heat pump unit water inlet solenoid valve (12) is provided on the heat pump unit water inlet. A heat pump unit water outlet solenoid valve (11) is provided on the heat pump unit water outlet. The heat pump unit water inlet solenoid valve (12) is connected to a sand removal mechanism (7) through the delivery pipeline (16). The heat pump unit water outlet solenoid valve (11) is connected to the second flow solenoid valve (10) through the delivery pipeline (16). An automatic exhaust valve (13) is provided at the highest point of the delivery pipeline (16). The second flow solenoid valve (10), the heat pump unit water inlet solenoid valve (12) and the heat pump unit water outlet solenoid valve (11) are all electrically connected to a control unit.

7. The water source heat pump water source side series energy-saving water pump system according to claim 1, characterized in that: In step one, the pretreatment includes the control unit opening a sewage drainage mechanism to drain sewage from the delivery pipeline. After the sewage is drained, the control unit closes the sewage drainage mechanism and opens the diving main path, the circulation branch path, the sand removal main path and each solenoid valve connected in series with the delivery pipeline; The steps for the control unit to detect whether the system flow value is greater than a preset flow Q are as follows: A1): The control unit collects the flow values of the first flowmeter and the second flowmeter in real time; A2): The control unit determines whether the flow values of the first flowmeter and the second flowmeter collected are the same. If they are the same, it proceeds to step A3). If they are not the same, the control unit controls the system to stop running; A3): The control unit numerically compares the flow value of the first flowmeter or the second flowmeter with the preset flow Q.

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