Heat pump heat recovery system, control method thereof and hydraulic module

Abstract

This application provides a heat pump heat recovery system, its control method, and a hydraulic module. The heat pump heat recovery system includes a connected heat pump unit and a hydraulic module, with the hydraulic module positioned between at least one heat exchange side and a user system located on that heat exchange side. The hydraulic module includes: a connecting pipe, with its two ends connected to a supply pipe and a return pipe, respectively; a control valve for controlling the on / off state of the connecting pipe and the supply or return pipe, and for regulating the flow rate, as well as controlling the on / off state of the supply or return pipe itself, and for regulating the flow rate; and a first pump, positioned in the connecting pipe, for driving fluid from the supply pipe through the connecting pipe into the return pipe. The heat pump heat recovery system innovatively incorporates a hydraulic module, which has a simple structure, is small in size and footprint, and can be mass-produced. Furthermore, the temperature provided by the fluid on the heat exchange side does not need to exceed the user system's required temperature; the two temperatures can be kept balanced, thus avoiding heat loss.

Description

Technical Field

[0001] This application relates to the field of heat pump technology, specifically to a heat pump heat recovery system and its control method, as well as the hydraulic module included in the system. Background Technology

[0002] In a heat recovery system with a heat pump unit, the heat pump unit has two heat exchange sides: a cooling side and a heating side. Each heat exchange side is connected to a user system, which is a heat dissipation system and a heat utilization system, respectively. For example, the heat dissipation system can be a process system, connected to the cooling side for cooling the process system; the heat utilization system can be a heating system, connected to the heating side for providing heat to the heating system. However, the temperature of either the cooling or heating side can only be controlled selectively. If the operation of the heat pump unit needs to meet the temperature requirements of the cooling side, the temperature control of the heating side will be relaxed; conversely, if the operation of the heat pump unit needs to meet the temperature requirements of the heating side, the temperature control of the cooling side will be relaxed.

[0003] In order to control the temperature of both the cooling and heating sides simultaneously, existing technologies often add a water storage tank or heat exchanger between the heat exchange side, which cannot be temperature controlled, and the user system located on the heat exchange side. However, the water storage tank has a large structural size and occupies a large area, and it needs to be customized and cannot be mass-produced. There are many valve and pipe components that cooperate with the heat exchanger, and the installation is complicated. At the same time, there will be a lot of heat loss. Summary of the Invention

[0004] In view of this, this application provides a heat pump heat recovery solution that can simultaneously regulate the temperature of the cooling and heating sides without the need for additional water storage tanks or heat exchangers. It has a simple structure, few parts, and is easy to install, enabling mass production and improving production and assembly efficiency.

[0005] Specifically, the technical solution is as follows:

[0006] A heat pump heat recovery system includes a connected heat pump unit and a hydraulic module. The heat pump unit has two heat exchange sides respectively connected to a user system. The hydraulic module is disposed between at least one of the heat exchange sides and the user system located on that heat exchange side, and is used to control the temperature of the fluid circulating between the heat exchange side and the user system. The heat exchange side and the user system are connected through a supply pipeline and a return pipeline. The hydraulic module includes:

[0007] The connecting pipeline is connected at both ends to the liquid supply pipeline and the liquid return pipeline, respectively;

[0008] A control valve is used to control the opening and closing of the connecting pipeline and the supply pipeline or the return pipeline, as well as to regulate the flow rate, and to control the opening and closing of the supply pipeline or the return pipeline itself, as well as to regulate the flow rate.

[0009] A first pump is installed in the connecting pipe and is used to drive fluid from the supply pipe through the connecting pipe into the return pipe.

[0010] Optionally, in the above-mentioned heat pump heat recovery system, the control valve is used to control the opening and closing of the connecting pipeline and the return pipeline and to regulate the flow rate, as well as to control the opening and closing of the return pipeline itself and to regulate the flow rate; the hydraulic module includes an on / off valve, which is installed in the supply pipeline and is used to control the opening and closing of the supply pipeline.

[0011] Optionally, in the above-mentioned heat pump heat recovery system, the control valve is a multi-way valve that connects the connecting pipeline and the return pipeline, with one port of the multi-way valve connected to the connecting pipeline and the other two ports connected to the return pipeline.

[0012] Optionally, in the above-mentioned heat pump heat recovery system, the hydraulic module includes a first temperature sensor and a second temperature sensor;

[0013] The first temperature sensor is used to detect the temperature of the fluid flowing from the heat pump unit to the hydraulic module through the liquid supply pipeline;

[0014] The second temperature sensor is used to detect the temperature of the fluid flowing from the hydraulic module to the heat pump unit through the return pipeline.

[0015] Optionally, in the above-mentioned heat pump heat recovery system, the hydraulic module includes a controller; the control valve is an electrically controlled valve.

[0016] The control valve, the first pump, the first temperature sensor, and the second temperature sensor are all communicatively connected to the controller.

[0017] Optionally, in the above-mentioned heat pump heat recovery system, a second pump is provided on the liquid supply pipeline or the liquid return pipeline, so that fluid flows from the heat exchange side to the user system through the liquid supply pipeline, and flows from the user system to the heat exchange side through the liquid return pipeline.

[0018] Optionally, in the above-mentioned heat pump heat recovery system, a hydraulic module is provided between one of the heat exchange sides and the user system located on the heat exchange side; a differential pressure bypass valve is provided between the other heat exchange side and the user system located on the heat exchange side.

[0019] A hydraulic module is disposed between the heat exchange side of a heat pump unit and a user system located on the heat exchange side, for controlling the temperature of the fluid circulating between the heat exchange side and the user system, wherein the heat exchange side and the user system are connected via a supply pipeline and a return pipeline, and the hydraulic module includes:

[0020] The connecting pipeline is connected at both ends to the liquid supply pipeline and the liquid return pipeline, respectively;

[0021] The control valve is a three-way valve that connects the connecting pipeline and the return pipeline. One port of the three-way valve is connected to the connecting pipeline, and the other two ports are connected to the return pipeline. It is used to control the opening and closing of the connecting pipeline and the return pipeline and to regulate the flow rate, as well as to control the opening and closing of the return pipeline itself and to regulate the flow rate.

[0022] A first pump is installed in the connecting pipe and is used to drive fluid from the supply pipe through the connecting pipe into the return pipe;

[0023] An on / off valve is installed in the liquid supply pipeline to control the on / off state of the liquid supply pipeline and to regulate the flow rate.

[0024] A first temperature sensor is used to detect the temperature of the fluid flowing from the heat pump unit to the hydraulic module through the liquid supply pipeline;

[0025] The second temperature sensor is used to detect the temperature of the fluid flowing from the hydraulic module to the heat pump unit through the return pipe;

[0026] Controller;

[0027] The control valve and the on / off valve are both electrically controlled valves, and the control valve, the on / off valve, the first pump, the first temperature sensor and the second temperature sensor are all communicatively connected to the controller.

[0028] A control method for a heat pump heat recovery system, applicable to the heat pump heat recovery system as described above, wherein the heat pump unit of the heat pump heat recovery system has two heat exchange sides, namely a cooling side and a heating side, and the user system connected to the heating side is a heat-consuming system. A hydraulic module is provided between the heating side and the heat-consuming system. In the mode of heating the heat-consuming system, the control method of the heat pump heat recovery system includes:

[0029] Turn on the heat pump unit;

[0030] The temperature T1 of the fluid flowing into the heat system through the supply pipe, the temperature T2 of the fluid flowing out of the heat system through the return pipe, and the difference Δ1 between T1 and T2 are obtained.

[0031] The temperature T3 of the fluid flowing from the heating side to the hydraulic module through the supply pipe, the temperature T4 of the fluid flowing from the hydraulic module to the heating side through the return pipe, and the difference Δ2 between T3 and T4 are obtained.

[0032] When Δ1≥Δ2, the control valve connects the pipeline, and the first pump drives the fluid from the supply pipeline through the connecting pipeline into the return pipeline. The on / off valve blocks the supply pipeline, and the control valve blocks the return pipeline until T3≥T1.

[0033] The on / off valve is connected to the liquid supply line, and the control valve is connected to the liquid return line.

[0034] Optionally, in the control method of the above-mentioned heat pump heat recovery system, the target temperature of the fluid flowing from the heating side to the hydraulic module through the liquid supply pipeline is set to T. 目标 T1-Δ 下偏差 ≤T 目标 ≤T1+Δ 上偏差 ;

[0035] When the on / off valve connects to the liquid supply line and the control valve connects to the liquid return line, T3 is monitored in real time;

[0036] When T1-T3>Δ 下偏差 When T3 > T1, the opening degree of the on / off valve and the control valve is dynamically adjusted so that the flow rate of the liquid supply pipeline is in reverse linkage control with the flow rate of the connecting pipeline until T3 > T1.

[0037] The opening degree of the on / off valve and the control valve enters the holding state.

[0038] Optionally, in the control method of the above heat pump heat recovery system, when T1-T3 < Δ 下偏差 When the opening degree of the on / off valve and the opening degree of the control valve are adjusted dynamically, the flow rate of the liquid supply line and the flow rate of the liquid return line will both increase rapidly.

[0039] Optionally, in the control method of the above-mentioned heat pump heat recovery system,

[0040] When Δ1 < Δ2, the on / off valve connects the liquid supply line, the control valve connects the liquid return line, and the speed of the second pump is increased to increase the flow rate of the liquid supply line.

[0041] Specifically, when the pressure difference between the supply pipeline and the return pipeline is less than the minimum pressure difference requirement of the heat pump unit, the control valve connects the connecting pipeline; otherwise, the control valve blocks the connecting pipeline.

[0042] The heat pump heat recovery system and its control method and hydraulic module provided in this application creatively set up a hydraulic module between at least one heat exchange side of the heat pump unit and the user system located on that heat exchange side. Taking the setting of a hydraulic module between the heating side and the heat consumption system as an example, the difference Δ2 between the temperature T3 when the fluid just flows out of the heating side and the temperature T4 when the fluid flows into the heating side is the heating temperature difference that the fluid on the heating side can provide; the difference Δ1 between the required temperature T1 when the fluid flows into the heat consumption system and the required temperature T2 when the fluid just flows out of the heat consumption system is the required temperature difference; when the temperature T3 rises to be equal to T1, the fluid on the heat exchange side can meet the heating system requirements. The required temperature difference is determined by the system's operating parameters. When the required temperature difference Δ1 is greater than the heating temperature difference Δ2, the hydraulic module operates as follows: ① The control valve blocks the return pipe, preventing fluid circulation between the heating side and the heat-using system; ② The control valve connects the connecting pipe, and the first pump starts working, allowing the fluid to bypass and return to the heating side before entering the heat-using system, thus repeatedly circulating and heating the fluid on the heating side until the fluid temperature T3 rises to the same level as T1; ③ When T3 equals T1, the control valve connects the return pipe to initiate fluid circulation between the heating side and the heat-using system, while the control valve remains connected to the connecting pipe. As described above, the hydraulic module provided in this application embodiment can precisely control the temperature on the heating side of the heat pump unit, ensuring that the heat supplied by the fluid meets the user system's heat demand. Furthermore, the hydraulic module has a simple and compact structure, is small in size and footprint, and can be flexibly applied to various operating scenarios. It can be mass-produced, and the temperature provided by the fluid on the heat exchange side does not need to exceed the user system's required temperature; maintaining a balance between the two avoids heat loss. Attached Figure Description

[0043] To more clearly illustrate the technical solutions of the embodiments of this application, a brief description will be given below in conjunction with the accompanying drawings. Obviously, the drawings described below are merely embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without any creative effort.

[0044] Figure 1 This is a schematic diagram of a heat pump heat recovery system provided in this embodiment.

[0045] Figure 1 middle:

[0046] 100. Hydraulic module; 200. Heat pump unit; 300. Heating system; 400. Heat dissipation system; 500. Liquid supply pipeline; 600. Liquid return pipeline;

[0047] 101. Connecting pipeline; 102. Control valve; 103. First pump; 104. On / off valve; 105. Inlet pipeline; 106. Outlet pipeline; 107. First temperature sensor; 108. Second temperature sensor; 109. Controller;

[0048] 201. Evaporator; 202. Compressor; 203. Condenser; 204. Expansion valve;

[0049] 301. Second pump;

[0050] 401. Differential pressure bypass valve. Detailed Implementation

[0051] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0052] like Figure 1 As shown in the figure, this application embodiment provides a heat pump heat recovery system, which includes a connected heat pump unit 200 and a hydraulic module 100. The heat pump unit 200 has two heat exchange sides respectively connected to a user system. At least one heat exchange side is connected to the user system located on that heat exchange side by a hydraulic module 100, which is used to control the temperature of the fluid circulating between the heat exchange side and the user system. The heat exchange side and the user system are connected by a liquid supply line 500 and a liquid return line 600, thereby realizing the circulation of fluid between the heat exchange side and the user system.

[0053] The heat pump unit 200 has two heat exchange sides, each equipped with a user system; the two heat exchange sides are the cooling side and the heating side, respectively; correspondingly, the two user systems are the heat dissipation system 400 and the heat consumption system 300. The heat pump unit 200 includes an evaporator 201, a compressor 202, a condenser 203, and an expansion valve 204, all connected in a circulating manner; the refrigerant of the heat pump unit 200 circulates among these components; the side containing the evaporator 201 is the cooling side; the side containing the condenser 203 is the heating side. The refrigerant of the heat pump unit 200 exchanges heat with the fluid of the heat dissipation system 400 in the evaporator 201. The heat from the fluid in the heat dissipation system 400 diffuses to the refrigerant, cooling the fluid in the heat dissipation system 400. The cooled fluid is then used to cool the heat dissipation system 400. After exchanging heat with the fluid in the heat dissipation system 400, the refrigerant absorbs heat and evaporates, vaporizing. The vaporized refrigerant passes through the compressor 202, where its temperature and pressure increase, before entering the condenser 203. In the condenser 203, the refrigerant exchanges heat with the fluid in the heat-using system 300. The heat from the refrigerant diffuses into the fluid in the heat-using system 300, raising its temperature. The heated fluid is then used for heating in the heat-using system 300. After exchanging heat with the fluid in the heat-using system 300, the refrigerant condenses and liquefies, cooling down. The liquefied refrigerant then passes through the expansion valve 204, where it is throttled into a two-phase state and enters the evaporator 201 to exchange heat again with the fluid in the heat dissipation system 400. This cycle repeats continuously.

[0054] If the operation of the heat pump unit 200 needs to meet the temperature requirements of the cooling side, a hydraulic module 100 is installed between the heating side and the heat-using system 300; if the operation of the heat pump unit 200 needs to meet the temperature requirements of the heating side, a hydraulic module 100 is installed between the cooling side and the heat dissipation system 400. Of course, hydraulic modules 100 can also be installed simultaneously between the heating side and the heat-using system 300, and between the cooling side and the heat dissipation system 400.

[0055] It should be noted that "fluid circulation between the heat exchange side and the user system" specifically refers to the following: when the hydraulic module 100 is installed on the cooling side, the fluid circulates between the evaporator 201 and the heat dissipation system 400; when the hydraulic module 100 is installed on the heating side, the fluid circulates between the condenser 203 and the heat application system 300. "The hydraulic module 100 controls the temperature of the fluid" means that when the hydraulic module 100 is installed on the cooling side, it controls the temperature of the fluid flowing from the evaporator 201 to the heat dissipation system 400, which can also be referred to as temperature control on the cooling side; when the hydraulic module 100 is installed on the heating side, it controls the temperature of the fluid flowing from the condenser 203 to the heat application system 300, which can also be referred to as temperature control on the heating side.

[0056] See Figure 1Taking the installation of a hydraulic module 100 between the heating side and the heat-using system as an example, this application provides a detailed description of the structural composition of the hydraulic module 100 and its cooperation process with the heat pump unit in this embodiment.

[0057] The hydraulic module 100 includes a connecting pipe 101, a control valve 102, and a first pump 103. The two ends of the connecting pipe 101 are connected to a supply pipe 500 and a return pipe 600, respectively. The control valve 102 is located on the return pipe 600 and can be a multi-way valve, preferably a three-way valve, with one port connected to the connecting pipe 101. Thus, the control valve 102 can control the opening and closing of the connecting pipe 101 and the return pipe 600, as well as the opening and closing of the return pipe 600 itself. The first pump 103 is located on the connecting pipe 101 and is used to drive fluid from the supply pipe 500 through the connecting pipe 101 into the return pipe 600.

[0058] By controlling valve 102, it is possible to control whether the fluid circulates between the heat exchange side of the heat pump unit 200 and the user system, as well as the flow rate of such circulation. By controlling the cooperation of valve 102 and the first pump 103, it is possible to control whether the fluid bypasses and flows back to the heat exchange side through the connecting pipe 101 before entering the user system, as well as the flow rate of such bypass flow.

[0059] As described above, by controlling the coordinated operation of valve 102 and the first pump 103, the temperature of the fluid on the heat exchange side of the hydraulic module 100 can be controlled. Taking the hydraulic module 100 between the heating side and the heat-using system 300 as an example, the temperature difference Δ2 between the fluid temperature T3 (i.e., the temperature of the fluid flowing from the heating side to the hydraulic module 100 through the supply pipe 500) and the fluid temperature T4 (i.e., the temperature of the fluid flowing from the hydraulic module 100 to the heating side through the return pipe 600) is the heating temperature difference that the fluid on the heating side can provide. The temperature difference Δ1 between the required temperature T1 of the fluid flowing into the heat-using system 300 and the required temperature T2 of the fluid flowing out of the heat-using system 300 is the required temperature difference. Only when the temperature T3 rises to the same level as T1 can the fluid on the heat exchange side meet the required temperature difference of the heat-using system 300. When the demand temperature difference Δ1 is greater than the heating temperature difference Δ2, the hydraulic module 100 operates as follows: ① Control valve 102 blocks the return pipe 600, so the fluid does not circulate between the heating side and the heating system 300; ② Control valve 102 connects the connecting pipe 101, and the first pump 103 starts working, so that the fluid bypasses and flows back to the heating side through the connecting pipe 101 before entering the heating system 300, thereby causing the fluid to circulate and heat repeatedly on the heating side until the fluid temperature T3 rises to be equal to T1; ③ When T3 is equal to T1, control valve 102 connects the return pipe 600 to start the circulation of fluid between the heating side and the heating system 300, while control valve 102 remains connected to the connecting pipe 101.

[0060] This application embodiment creatively sets up a hydraulic module 100 between at least one heat exchange side of the heat pump unit 200 and the user system located on the heat exchange side. The hydraulic module 100 has a simple and compact structure, is small in size and occupies a small area, can be flexibly applied to various operating scenarios, can be mass-produced, and the temperature provided by the fluid on the heat exchange side does not need to exceed the required temperature of the user system. The two can be kept at the same level, thus avoiding heat loss.

[0061] In some embodiments, the control valve 102 is a three-way valve, one of the ports of which is connected to the connecting pipe 101, and the other two ports are connected to the liquid supply pipe 500. As described above, the control valve 102 can control the opening and closing of the connecting pipe 101 and the liquid supply pipe 500, as well as the opening and closing of the liquid supply pipe 500 itself.

[0062] In some embodiments, the control valve 102 includes a first valve and a second valve. The first valve controls the opening and closing of the connecting pipeline 101, and the second valve controls the opening and closing of the liquid supply pipeline 500 or the liquid return pipeline 600. Both the first valve and the second valve can be two-way valves.

[0063] In some embodiments of this application, the control valve 102 is a three-way valve, which connects the connecting pipeline 101 and the return pipeline 600. The hydraulic module 100 includes an on / off valve 104, which is disposed in the supply pipeline 500 and used to control the on / off state of the supply pipeline 500. When it is necessary to block the circulation of fluid between the heating side and the user system, the control valve 102 blocks the return pipeline 600, and the on / off valve 104 blocks the supply pipeline 500.

[0064] It should be noted that the hydraulic module 100 may only include the connecting pipe 101, the control valve 102, the first pump 103, and the on / off valve 104. These four components can be installed in the supply pipe 500 and the return pipe 600.

[0065] In some embodiments, the hydraulic module 100, in addition to the four components—connecting pipe 101, control valve 102, first pump 103, and on / off valve 104—also includes an inlet pipe 105 and an outlet pipe 106. The connecting pipe 101, control valve 102, first pump 103, and on / off valve 104 are simply disposed within the inlet pipe 105 and outlet pipe 106. As described above, this achieves a modular configuration of the hydraulic module 100. The valves, pumps, and other components are already assembled. The two ends of the inlet pipe 105 are connected to the heat exchange side and the user system, respectively, and the two ends of the outlet pipe 106 are also connected to the heat exchange side and the user system, respectively. This simplifies the assembly process of the hydraulic module 100 in the thermal management system, making operation convenient, fast, and time-saving.

[0066] Both ends of the liquid inlet pipe 105 are connected to the heat exchange side and the user system respectively through a first connecting pipe of a certain length. The liquid inlet pipe 105 and the first connecting pipe together form the liquid supply pipe 500, and the liquid inlet pipe 105 is a component of the liquid supply pipe 500. Both ends of the liquid outlet pipe 106 are connected to the heat exchange side and the user system respectively through a second connecting pipe of a certain length. The liquid outlet pipe 106 and the second connecting pipe together form the liquid return pipe 600, and the liquid outlet pipe 106 is a component of the liquid return pipe 600.

[0067] In some embodiments of this application, the hydraulic module 100 includes a first temperature sensor 107 and a second temperature sensor 108. The first temperature sensor 107 is disposed in the inlet pipe 105 and is used to detect the temperature of the fluid in the inlet pipe 105, that is, to detect the temperature T3 of the fluid flowing from the heat exchange side to the hydraulic module 100. The second temperature sensor 108 is disposed in the outlet pipe 106, and the connection point of the second temperature sensor 108 on the outlet pipe 106 is closer to the heat pump unit 200 than the connection point of the connecting pipe 101; the second temperature sensor 108 is used to detect the temperature of the fluid in the outlet pipe 106, that is, to detect the temperature T4 of the fluid flowing from the hydraulic module 100 to the heat exchange side.

[0068] By setting the first temperature sensor 107 and the second temperature sensor 108, the temperature of the fluid at each flow point can be accurately and efficiently obtained, and the operation of the hydraulic module 100 can be controlled by the detected temperature and temperature difference.

[0069] In some embodiments of this application, the hydraulic module 100 includes a controller 109. The control valve 102 is an electrically controlled three-way valve, and the on / off valve 104 is an electrically controlled valve. The control valve 102, the first pump 103, the on / off valve 104, the first temperature sensor 107, and the second temperature sensor 108 are all communicatively connected to the controller 109.

[0070] As shown above, PID control of the hydraulic module 100 can be achieved. As long as the customer's required temperature is input, the program can control the valves and pumps of the hydraulic module 100, thereby realizing automatic control of fluid temperature.

[0071] In some embodiments of this application, a second pump 301 is provided on the supply line 500 or the return line 600 to allow fluid to flow from the heat exchange side to the user system through the supply line 500, and from the user system to the heat exchange side through the return line 600.

[0072] Furthermore, a hydraulic module 100 is installed between the heating side and the heat-using system 300, and a differential pressure bypass valve 401 is installed between the cooling side and the heat dissipation system 400. The cooling side and the heat dissipation system 400 are connected by a supply liquid pipeline and a return liquid pipeline, and a bypass pipeline is connected between the supply liquid pipeline and the return liquid pipeline. The differential pressure bypass valve 401 is installed in the bypass pipeline to control the opening and closing of the bypass pipeline. When the pressure difference between the supply liquid pipeline and the return liquid pipeline between the cooling side and the heat dissipation system 400 is less than the minimum pressure difference requirement of the heat pump unit 200, the differential pressure bypass valve 401 opens the bypass pipeline. By setting the differential pressure bypass valve 401, the smooth circulation of fluid on the cooling side can be ensured, thus ensuring the stable operation of the thermal management system.

[0073] In some embodiments, a hydraulic module 100 is provided between the cooling side and the heat dissipation system 400, and a differential pressure bypass valve 401 is provided between the heating side and the heat use system 300.

[0074] This application also provides a hydraulic module 100, which is disposed between the heat exchange side of a heat pump unit 200 and a user system located on the heat exchange side. The hydraulic module 100 is used to control the temperature of the fluid circulating between the heat exchange side and the user system. The heat exchange side and the user system are connected via a supply pipe 500 and a return pipe 600. The hydraulic module 100 includes an inlet pipe 105, an outlet pipe 106, a connecting pipe 101, a control valve 102, a first pump 103, an on / off valve 104, a first temperature sensor 107, a second temperature sensor 108, and a controller 109. The inlet pipe 105 is a component of the supply pipe 500. The outlet pipe 106 is a component of the return pipe 600. The two ends of the connecting pipe 101 are connected to the inlet pipe 105 and the outlet pipe 106, respectively. Control valve 102 is a three-way valve connecting connecting pipe 101 and outlet pipe 106. One port of the three-way valve is connected to connecting pipe 101, and the other two ports are connected to outlet pipe 106. It is used to control the on / off state of connecting pipe 101 and outlet pipe 106, as well as to regulate the flow rate, and to control the on / off state of outlet pipe 106 itself, as well as to regulate the flow rate. First pump 103 is installed in connecting pipe 101 and is used to drive fluid from inlet pipe 105 through connecting pipe 101 into outlet pipe 106. On / off valve 104 is installed in inlet pipe 105 and is used to control the on / off state of inlet pipe 105 and to regulate the flow rate. First temperature sensor 107 is used to detect the temperature of the fluid flowing from heat pump unit 200 to hydraulic module 100 through inlet pipe 105. Second temperature sensor 108 is used to detect the temperature of the fluid flowing from hydraulic module 100 to heat pump unit 200 through outlet pipe 106. Control valve 102 and on / off valve 104 are both electrically controlled valves. Control valve 102, on / off valve 104, first pump 103, first temperature sensor 107 and second temperature sensor 108 are all connected to controller 109.

[0075] The hydraulic module of this application can be used in the heat pump heat recovery system mentioned above, and its beneficial effects can be found above, so they will not be repeated here.

[0076] This application also provides a control method for a heat pump heat recovery system, which will now be described using temperature control on the heating side as an example. In the mode where the heat-using system 300 is in heating mode, the control process of the heat pump heat recovery system is as follows.

[0077] First, before the heat pump unit 200 is started, the fluids in the heat dissipation system 400 and the heat use system 300 are in a state of circulation. The circulation volume of the fluid can be 60%-85% of the total flow volume; preferably 75% of the total flow volume.

[0078] S1: Start the heat pump unit 200;

[0079] S2: Obtain the temperature T1 of the fluid flowing into the heat system 300 through the supply pipe 500 and the temperature T2 of the fluid flowing out of the heat system 300 through the return pipe 600, which are required by the heat system 300; T1 and T2 are both set values.

[0080] S3: The temperature T3 of the fluid flowing from the heating side to the hydraulic module 100 through the liquid supply line 500 is obtained by the first temperature sensor 107, and the temperature T4 of the fluid flowing from the hydraulic module 100 to the heating side through the liquid return line 600 is obtained by the second temperature sensor 108.

[0081] S4: Obtain the difference Δ1 between T1 and T2, and the difference Δ2 between T3 and T4, and compare the magnitudes of Δ1 and Δ2; this part of the calculation can be completed in the controller 109;

[0082] S5-1: When Δ1 < Δ2, the on / off valve 104 is connected to the liquid supply line 500, the control valve 102 is connected to the liquid return line 600, and the speed of the second pump 301 is increased to increase the flow rate of the liquid supply line 500.

[0083] It should be noted that the required temperatures T1 and T2 of the heating system 300 are set values ​​set by the user system according to its own heating needs. The required temperatures T1 and T2 can be input through the command input structure, and the input command is transmitted to the controller 109 of the hydraulic module 100. The command input structure can be a control panel that is communicatively connected to the controller 109.

[0084] When Δ1 < Δ2, and when the pressure difference between the supply line 500 and the return line 600 is less than the minimum pressure difference of the heat pump unit 200, the control valve 102 connects the connecting line 101; otherwise, the control valve 102 blocks the connecting line 101. In this state, the control valve 102 acts as a pressure differential bypass valve to ensure smooth circulation of the heating side fluid and stable operation of the heat recovery system. The larger the difference between Δ1 and Δ2, the higher the speed of the second pump 301.

[0085] When the required temperature difference of the heating system 300 is less than the supply temperature difference of the heating side, increasing the speed of the second pump 301 can increase the flow rate of the fluid in the heating system 300, thereby increasing the amount of heat supplied by the fluid to the heating system 300 to meet the heat demand of the heating system 300.

[0086] Furthermore, the control methods for the heat pump heat recovery system include:

[0087] S5-2: When Δ1≥Δ2, the controller 109 controls the control valve 102 to connect the connecting pipe 101, and the first pump 103 drives the fluid from the supply pipe 500 through the connecting pipe 101 into the return pipe 600. Meanwhile, the on / off valve 104 blocks the supply pipe 500 and the control valve 102 blocks the return pipe 600 until T3≥T1.

[0088] When T3≥T1, the controller 109 controls the on / off valve 104 to connect the liquid supply line 500 and the control valve 102 to connect the liquid return line 600; and the control valve 102 is always connected to the connecting line 101.

[0089] When the required temperature difference of the heating system 300 is greater than the supply temperature difference of the heating side, the hydraulic module 100 operates by first blocking the circulation of fluid between the heating side and the heating system 300, allowing the fluid to bypass and flow back to the heating side through the connecting pipe 101, thereby causing the fluid to circulate and heat repeatedly on the heating side until the fluid temperature T3 rises to a level not lower than T1, and then resuming the circulation of fluid between the heating side and the heating system 300, thus satisfying the required heat demand of the heating system 300.

[0090] Furthermore, the control methods for the heat pump heat recovery system include:

[0091] The target temperature of the fluid flowing from the heating side to the hydraulic module 100 through the liquid supply line 500 is set to T. 目标 T1-Δ 下偏差 ≤T 目标 ≤T1+Δ 上偏差 ;

[0092] S5-2-1: When Δ1≥Δ2, and after the on-off valve 104 connects to the liquid supply line 500 and the control valve 102 connects to the liquid return line 600, T3 is monitored in real time through the controller 109 and the first temperature sensor 107.

[0093] When T1-T3>Δ 下偏差 When T3 > T1, the controller 109 dynamically adjusts the opening of the on / off valve 104 and the opening of the control valve 102 so that the flow rate of the liquid supply line 500 and the flow rate of the connecting line 101 are controlled in reverse linkage until T3 > T1.

[0094] When T3 > T1, the controller 109 controls the on / off valve 104 and the valve 102 to enter the holding state.

[0095] It should be noted that the heating temperature T3 provided by the heating side does not need to be precisely consistent with the required temperature T1 of the heating system 300. A certain deviation above or below T1 is sufficient to meet the heating needs of the heating system 300; therefore, T... 目标 It is not a specific point value, but a range of values ​​that satisfy: T1-Δ 下偏差 ≤T 目标 ≤T1+Δ 上偏差 When T1 falls into T 目标 The heating demand of the 300 heating system can be met within the specified range. For example, 2℃ ≤ Δ 下偏差 ≤5℃; 2℃≤Δ 上偏差 ≤5℃.

[0096] "Flow rate of supply line 500" refers to the flow rate into the heat system 300 through supply line 500. "Reverse linkage control" means that when the flow rate of supply line 500 increases, the flow rate of connecting line 101 decreases; conversely, when the flow rate of supply line 500 decreases, the flow rate of connecting line 101 increases. Fluid flow rate and velocity are positively correlated; that is, the greater the flow rate, the greater the velocity. T3 is at T... 目标 Within the specified range, the required heat capacity of the 300 heating system can be met.

[0097] When the temperature of T3 drops to a value outside the target temperature range, the valves and pumps of the hydraulic module 100 are further controlled to further regulate the temperature of the heating test and raise the temperature of T3 back to the target temperature range.

[0098] Furthermore, the control methods for heat pump heat recovery systems include:

[0099] S5-2-2: When T1-T3<Δ 下偏差At that time, the controller 109 dynamically adjusts the opening degree of the on / off valve 104 and the control valve 102 to rapidly increase the flow rate of both the supply line 500 and the return line 600. It should be noted that Δ 下偏差 The value is 5℃.

[0100] When T1-T3<Δ 下偏差 When this occurs, it indicates that the temperature of T3 is about to rise above that of T1. To prevent the temperature of T3 from exceeding T1+Δ, 上偏差 Therefore, the opening degree of the on / off valve 104 and the opening degree of the control valve 102 are quickly increased, thereby increasing the flow rate of the liquid supply line 500 and the flow rate of the liquid return line 600, thereby suppressing the heating rate of the heat system 300.

[0101] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0102] The components and devices described in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the accompanying drawings. As those skilled in the art will recognize, these components and devices can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the words “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0103] It should also be noted that in the apparatus and equipment of this application, the components can be disassembled and / or reassembled. These disassemblies and / or reassemblies should be considered as equivalent solutions of this application.

[0104] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0105] It should be understood that the qualifiers “first,” “second,” “third,” “fourth,” “fifth,” and “sixth” used in the description of the embodiments of this application are only used to more clearly illustrate the technical solutions and are not intended to limit the scope of protection of this application.

[0106] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

[0107] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications or equivalent substitutions made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A heat pump heat recovery system, characterized in that, The system includes a connected heat pump unit and a hydraulic module. The heat pump unit has two heat exchange sides, each connected to a user system. The hydraulic module is disposed between at least one of the heat exchange sides and the user system located on that heat exchange side, and is used to control the temperature of the fluid circulating between the heat exchange side and the user system. The heat exchange side and the user system are connected via a supply line and a return line. The hydraulic module includes: The connecting pipeline is connected at both ends to the liquid supply pipeline and the liquid return pipeline, respectively; A control valve is used to control the opening and closing of the connecting pipeline and the supply pipeline or the return pipeline, as well as to regulate the flow rate, and to control the opening and closing of the supply pipeline or the return pipeline itself, as well as to regulate the flow rate. A first pump is installed in the connecting pipe and is used to drive fluid from the supply pipe through the connecting pipe into the return pipe.

2. The heat pump heat recovery system according to claim 1, characterized in that, The control valve is used to control the opening and closing of the connecting pipeline and the return pipeline, as well as to regulate the flow rate, and to control the opening and closing of the return pipeline itself, as well as to regulate the flow rate; the hydraulic module includes an on / off valve, which is installed in the supply pipeline and is used to control the opening and closing of the supply pipeline.

3. The heat pump heat recovery system according to claim 1, characterized in that, The control valve is a multi-way valve that connects the connecting pipeline and the return pipeline. One of the ports of the multi-way valve is connected to the connecting pipeline, and the other two ports are connected to the return pipeline.

4. The heat pump heat recovery system according to claim 1, characterized in that, The hydraulic module includes a first temperature sensor and a second temperature sensor; The first temperature sensor is used to detect the temperature of the fluid flowing from the heat pump unit to the hydraulic module through the liquid supply pipeline; The second temperature sensor is used to detect the temperature of the fluid flowing from the hydraulic module to the heat pump unit through the return pipeline.

5. The heat pump heat recovery system according to any one of claims 1-4, characterized in that, The hydraulic module includes a controller; the control valve is an electrically controlled valve. The control valve, the first pump, the first temperature sensor, and the second temperature sensor are all communicatively connected to the controller.

6. The heat pump heat recovery system according to claim 1, characterized in that, A second pump is provided on the liquid supply line or the liquid return line so that fluid flows from the heat exchange side to the user system through the liquid supply line, and flows from the user system to the heat exchange side through the liquid return line.

7. The heat pump heat recovery system according to claim 6, characterized in that, A hydraulic module is provided between one of the heat exchange sides and the user system located on that heat exchange side; a differential pressure bypass valve is provided between the other heat exchange side and the user system located on that heat exchange side.

8. A hydraulic module, characterized in that, A hydraulic module is installed between the heat exchange side of a heat pump unit and a user system located on the heat exchange side, for temperature control of the fluid circulating between the heat exchange side and the user system. The heat exchange side and the user system are connected via a supply pipeline and a return pipeline. The hydraulic module includes: The connecting pipeline is connected at both ends to the liquid supply pipeline and the liquid return pipeline, respectively; The control valve is a three-way valve that connects the connecting pipeline and the return pipeline. One port of the three-way valve is connected to the connecting pipeline, and the other two ports are connected to the return pipeline. It is used to control the opening and closing of the connecting pipeline and the return pipeline and to regulate the flow rate, as well as to control the opening and closing of the return pipeline itself and to regulate the flow rate. A first pump is installed in the connecting pipe and is used to drive fluid from the supply pipe through the connecting pipe into the return pipe; An on / off valve is installed in the liquid supply pipeline to control the on / off state of the liquid supply pipeline and to regulate the flow rate. A first temperature sensor is used to detect the temperature of the fluid flowing from the heat pump unit to the hydraulic module through the liquid supply pipeline; The second temperature sensor is used to detect the temperature of the fluid flowing from the hydraulic module to the heat pump unit through the return pipe; Controller; The control valve and the on / off valve are both electrically controlled valves, and the control valve, the on / off valve, the first pump, the first temperature sensor and the second temperature sensor are all communicatively connected to the controller.

9. A control method for a heat pump heat recovery system, characterized in that, The heat pump heat recovery system applicable to any one of claims 1-7, wherein the two heat exchange sides of the heat pump unit of the heat pump heat recovery system are a cooling side and a heating side, the user system connected to the heating side is a heat-consuming system, a hydraulic module is provided between the heating side and the heat-consuming system, and the control method of the heat pump heat recovery system in the mode of heating the heat-consuming system includes: Turn on the heat pump unit; The temperature T1 of the fluid flowing into the heat system through the supply pipe, the temperature T2 of the fluid flowing out of the heat system through the return pipe, and the difference Δ1 between T1 and T2 are obtained. The temperature T3 of the fluid flowing from the heating side to the hydraulic module through the supply pipe, the temperature T4 of the fluid flowing from the hydraulic module to the heating side through the return pipe, and the difference Δ2 between T3 and T4 are obtained. When Δ1≥Δ2, the control valve connects the pipeline, and the first pump drives the fluid from the supply pipeline through the connecting pipeline into the return pipeline. The on / off valve blocks the supply pipeline, and the control valve blocks the return pipeline until T3≥T1. The on / off valve is connected to the liquid supply line, and the control valve is connected to the liquid return line.

10. The control method for the heat pump heat recovery system according to claim 9, characterized in that, The target temperature of the fluid flowing from the heating side to the hydraulic module through the liquid supply pipeline is set to T. 目标 T1-Δ 下偏差 ≤T 目标 ≤T1+Δ 上偏差 ; When the on / off valve connects to the liquid supply line and the control valve connects to the liquid return line, T3 is monitored in real time; When T1-T3>Δ 下偏差 When T3 > T1, the opening degree of the on / off valve and the control valve is dynamically adjusted so that the flow rate of the liquid supply pipeline is in reverse linkage control with the flow rate of the connecting pipeline until T3 > T1. The opening degree of the on / off valve and the control valve enters the holding state.

11. The control method for the heat pump heat recovery system according to claim 10, characterized in that, When T1-T3<Δ 下偏差 When the opening degree of the on / off valve and the opening degree of the control valve are adjusted dynamically, the flow rate of the liquid supply line and the flow rate of the liquid return line will both increase rapidly.

12. The control method for the heat pump heat recovery system according to any one of claims 9-11, characterized in that, When Δ1 < Δ2, the on / off valve connects the liquid supply line, the control valve connects the liquid return line, and the speed of the second pump is increased to increase the flow rate of the liquid supply line. Specifically, when the pressure difference between the supply pipeline and the return pipeline is less than the minimum pressure difference requirement of the heat pump unit, the control valve connects the connecting pipeline; otherwise, the control valve blocks the connecting pipeline.

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