Double-heat-pump linkage system based on independent hot water

Abstract

The invention relates to a double-heat-pump linkage system based on independent hot water, which comprises an air source heat pump cold and warm water unit and a water ring type heat pump hot water unit which are connected through a water pipeline, and a temperature detection unit and a flow valve which are arranged on the connecting water pipeline, and the linkage controller is in communication connection with the air source heat pump cold and warm water unit, the water ring type heat pump hot water unit, the temperature detection unit and the flow valve. According to the system, an air source heat pump cooling and heating unit and a water ring type heat pump hot water unit are communicated and coupled only through a water pipeline, and the inlet and outlet water temperature, the water tank water temperature, the water supply flow and the indoor and outdoor temperature of the two heat pump units are collected through a linkage controller, so that linkage control over the air source heat pump cooling and heating unit and the water ring type heat pump hot water unit can be achieved; linkage hardware is simple and low in cost, the control method is simple and easy to implement, a combined system can be effectively formed for application scenes of the double heat pumps, popularization of the combined system is facilitated, and the social energy utilization rate is further increased.

Description

Technical Field

[0001] The invention relates to the control field of heat pump systems, and in particular to a dual heat pump linkage system based on independent hot water. Background Art

[0002] Air source heat pumps use outdoor air as a heat source, and water ring heat pumps use waste heat in the water circulation system. Both have their own advantages. With the development of heat pump technology, a combined system of air source heat pumps and water ring heat pumps has emerged. This combined system combines the advantages of the two heat pumps and can provide more efficient and energy-saving heating and cooling solutions. It can fully recover waste heat and absorb air heat energy, and can flexibly adjust heating and cooling according to outdoor climate changes and user needs. The combined system can effectively reduce operating costs and improve economic efficiency. It is the preferred configuration to solve the multiple needs of home heating, cooling, and hot water.

[0003] However, due to the low host versatility and complex system control of traditional fluorine-side air source heat pumps and water ring heat pumps, it is difficult to effectively link and control the air source heat pump and the water ring heat pump, resulting in the inability to form a combined system with one or more existing heat pumps, which is not conducive to the promotion of the combined system and further improving the social energy utilization rate. Summary of the invention

[0004] Based on this, the object of the present invention is to provide a dual heat pump linkage system based on independent hot water.

[0005] A dual heat pump linkage system based on independent hot water comprises an air source heat pump cooling and heating water unit and a water ring heat pump hot water unit connected by a water pipeline, a temperature detection unit and a flow valve arranged on the connecting water pipeline, and a linkage controller connected to the air source heat pump cooling and heating water unit, the water ring heat pump hot water unit, the temperature detection unit and the flow valve for communication. The linkage controller performs constant linkage control of the air source heat pump cooling and heating water unit and the water ring heat pump hot water unit in the following manner:

[0006] On the one hand, the operating state of the water ring heat pump water heater unit is obtained: if it is in the off state or standby state, step S2A is executed; if it is in the on state, step S3A is executed;

[0007] S2A obtains the water tank water temperature Tw1 of the water ring heat pump hot water unit. If the water tank water temperature Tw1 is less than or equal to the difference between the set water temperature and the start-stop temperature difference, a startup request is sent to the air source heat pump cooling and heating water unit; and after waiting for the first time period t1, if the flow control valve is open, the inlet water temperature Ti1 of the second evaporator of the water ring heat pump hot water unit is greater than or equal to the inlet water temperature threshold and there are no other faults, the water ring heat pump hot water unit is started; in other cases, a fault is reported and the unit is shut down;

[0008] S3A obtains the fault status, flow control valve status, inlet water temperature Ti1, outlet water temperature To1 and water tank water temperature Tw1 of the water ring heat pump hot water unit: if the water ring heat pump hot water unit has a fault, or the flow control valve is closed, or the inlet water temperature Ti1, outlet water temperature To1 and water tank water temperature Tw1 meet the set shutdown conditions, then a shutdown signal is sent to the air source heat pump cooling and heating water unit, and the unit shuts down and reports a fault; otherwise, the unit operates normally;

[0009] On the one hand, the operating state of the air source heat pump chiller and heater is obtained: if it is in shutdown or standby state, step S2B is executed; if it is in heating or cooling operation state, step S3B is executed;

[0010] S2B controls the circulation pump to start the second time period t2 according to the startup request signal sent by the water-ring heat pump hot water unit, and determines whether the outdoor ambient temperature Te meets the startup condition of the heating mode. If so, it controls the startup of the heating mode of the air source heat pump cooling and heating water unit, and continuously monitors whether the indoor heating temperature Tn meets the conditions for exiting the heating mode. If so, it controls the air source heat pump cooling and heating water unit to exit the heating mode;

[0011] S3B obtains the signal sent by the water ring heat pump water heater unit:

[0012] If it is a shutdown signal, the circulating pump is controlled to be in the closed state;

[0013] If it is a start-up signal, the circulation pump will be controlled to start.

[0014] Compared with the prior art, the dual heat pump linkage system based on independent hot water proposed in the present invention only uses water pipes to connect and couple the air source heat pump cooling and heating unit and the water ring heat pump hot water unit. Through a linkage controller, the inlet and outlet water temperatures, water tank water temperatures, water supply flow rates and indoor and outdoor temperatures of the two heat pump units are collected, thereby realizing linkage control of the air source heat pump cooling and heating unit and the water ring heat pump hot water unit. The linkage hardware is simple and low-cost, and the control method is simple and easy to implement. It can effectively form a combined system for the application scenarios of the dual heat pumps, which is conducive to the promotion of the combined system and further improves the social energy utilization rate.

[0015] Furthermore, the step S2A includes the following sub-steps:

[0016] S2A1 obtains the water temperature Tw1 of the water tank of the water ring heat pump water heater unit:

[0017] If the water temperature Tw1 of the water tank is greater than the difference between the set water temperature and the start-stop temperature difference, the water temperature Tw1 of the water tank is continuously obtained;

[0018] If the water temperature Tw1 of the water tank is less than or equal to the difference between the set water temperature and the start-stop temperature difference, a start-up request is sent to the air source heat pump water chiller and heater, and step S2A2 is executed;

[0019] After S2A2 waits for the first time period t1, it obtains the state of the flow control valve:

[0020] If the flow control valve is closed, the water ring heat pump hot water unit will be reported as a water flow failure and shut down;

[0021] If the flow control valve is open, execute step S2A3;

[0022] S2A3 obtains the water inlet temperature Ti1 of the second evaporator of the water ring heat pump hot water unit:

[0023] If the inlet water temperature Ti1 is less than the inlet water temperature threshold, the inlet water temperature Ti1 is continuously obtained;

[0024] If the inlet water temperature Ti1 is greater than or equal to the inlet water temperature threshold and there is no other fault, the water ring heat pump hot water unit is started. In other cases, other faults of the water ring heat pump hot water unit are reported and the unit is shut down.

[0025] Furthermore, the step S3A includes the following sub-steps:

[0026] S3A1 obtains the fault status of the water ring heat pump water heater unit:

[0027] If there is a fault in the water ring heat pump hot water unit, a shutdown signal is sent to the air source heat pump cooling and heating water unit, and other faults of the water ring heat pump hot water unit are reported and stopped;

[0028] If there is no fault in the water ring heat pump water heater, execute step S3A2;

[0029] S3A2 obtains the status of the flow control valve:

[0030] If the flow control valve is closed, a shutdown signal is sent to the air source heat pump cooling and heating water unit, and the water ring heat pump hot water unit is reported to shut down due to water flow failure, and stops running;

[0031] If the flow control valve is open, execute step S3A3;

[0032] S3A23 obtains the inlet water temperature Ti1 and outlet water temperature To1 of the second evaporator of the water ring heat pump hot water unit, and the water tank water temperature Tw1:

[0033] If the inlet water temperature Ti1 is less than or equal to the lower limit of the inlet water temperature, a shutdown signal is sent to the air source heat pump cooling and heating water unit, and the water ring heat pump hot water unit is reported to be shut down due to the low inlet water temperature fault, and stops running;

[0034] If the outlet water temperature To1 is less than or equal to the outlet water temperature lower limit, a shutdown signal is sent to the air source heat pump cooling and heating water unit, and the water ring heat pump hot water unit is reported to shut down due to the outlet water temperature being too low, and stops running;

[0035] If the water temperature Tw1 of the water tank is greater than or equal to the set water temperature and there is no other fault, a shutdown signal is sent to the air source heat pump cooling and heating water unit and the operation is stopped;

[0036] In other cases, the water ring heat pump hot water unit operates normally.

[0037] Furthermore, the step S2B includes the following sub-steps:

[0038] S2B1 obtains the signal sent by the water ring heat pump water heater unit:

[0039] If it is a shutdown signal, the circulating pump is controlled to be in the closed state;

[0040] If it is a power-on signal, the circulating pump is controlled to start for the second time period t2 and then step S3B2 is executed;

[0041] S2B2 obtains the outdoor ambient temperature Te:

[0042] If the outdoor ambient temperature Te is less than or equal to the set heating start temperature, the air source heat pump cooling and heating unit is controlled to start the heating mode, and the heating temperature is set before executing step S2B3;

[0043] If the outdoor ambient temperature Te is greater than the set heating start temperature, execute step S2B1;

[0044] S2B3 obtains the indoor heating temperature Tn:

[0045] If the indoor heating temperature Tn is greater than or equal to the sum of the set heating temperature and the allowable temperature fluctuation value, the air source heat pump cooling and heating unit is controlled to exit the heating mode and return to the shutdown or standby state;

[0046] In other cases, execute step S2B2.

[0047] Furthermore, the step S2B includes the following sub-steps:

[0048] S2B1 obtains the signal sent by the water ring heat pump water heater unit:

[0049] If it is a shutdown signal, the circulating pump is controlled to be in the closed state;

[0050] If it is a power-on signal, the circulating pump is controlled to start for the second time period t2 and then step S3B2 is executed;

[0051] S2B2 obtains the outdoor ambient temperature Te:

[0052] If the outdoor ambient temperature Te is less than or equal to the set heating start temperature, the air source heat pump cooling and heating unit is controlled to start the heating mode, and the heating temperature is set before executing step S2B3;

[0053] If the outdoor ambient temperature Te is greater than the set heating start temperature, execute step S2B1;

[0054] S2B3 obtains the indoor heating temperature Tn:

[0055] If the indoor heating temperature Tn is greater than or equal to the sum of the set heating temperature and the allowable temperature fluctuation value, the air source heat pump cooling and heating unit is controlled to exit the heating mode and return to the shutdown or standby state;

[0056] If the indoor heating temperature Tn is less than the sum of the set heating temperature and the allowable temperature fluctuation value, execute step S2B4;

[0057] S2B4 obtains the outdoor ambient temperature Te:

[0058] If the outdoor ambient temperature Te is greater than or equal to the set heating stop temperature, the air source heat pump cooling and heating unit is controlled to exit the heating mode and return to the shutdown or standby state;

[0059] If the outdoor ambient temperature Te is lower than the set heating stop temperature, execute step S2B3.

[0060] Furthermore, the linkage controller includes a first controller arranged in the air source heat pump cooling and heating water unit and a second controller arranged in the water ring heat pump hot water unit, wherein the first controller is at least communicatively connected to the temperature detection unit and the second controller, and the second controller is at least communicatively connected to the temperature detection unit, the flow control valve and the first controller.

[0061] For better understanding and implementation, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 A schematic diagram of the system structure of an embodiment of the present invention;

[0063] Figure 2 A schematic diagram of a control method flow chart of an embodiment of the present invention;

[0064] Figure 3 for Figure 2 Schematic diagram of the sub-step flow chart of a step in a control method. DETAILED DESCRIPTION

[0065] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention.

[0066] In order to solve the problem that the existing traditional fluorine-side air source heat pump and water ring heat pump cannot form a linkage heat pump system due to low host versatility and complex system control; after research and debugging, the present invention proposes a dual heat pump linkage system, which includes a dual heat pump linkage system based on independent hot water.

[0067] For specific implementation, please refer to Figure 1 The dual heat pump linkage system proposed in the present invention includes: an air source heat pump cooling and heating water unit 10 and a water ring heat pump hot water unit 20 connected by a water pipeline, and a temperature detection unit 30 and a flow valve 40 arranged on the connecting water pipeline, and a linkage controller communicatively connected to the air source heat pump cooling and heating water unit 10, the water ring heat pump hot water unit 20, the temperature detection unit 30 and the flow valve 40.

[0068] An air source heat pump chiller and heater 10, which includes a first compressor (not shown), a first four-way valve (not shown), a first condenser (not shown), a first throttle valve (not shown) and a first evaporator (not shown) which are sequentially connected in a cycle through a refrigerant pipeline; wherein the first condenser includes a return water port A and a water outlet B, wherein the return water port A is sequentially connected to the outlets of a circulating water pump 12 and a buffer water tank 13 through a water pipeline, and the water inlet of the buffer water tank 13 is respectively connected to the outlet of the user's terminal heat exchanger group through a water pipeline.

[0069] The user terminal heat exchanger group includes but is not limited to fan coil units, radiators, and floor heating pipes.

[0070] A water-ring heat pump hot water unit 20, which includes a second compressor (not shown), a second four-way valve (not shown), a second condenser (not shown), a second throttle valve (not shown) and a second evaporator (not shown) which are sequentially connected in a cycle through a refrigerant pipeline, and a water tank 22 for heat exchange with the second condenser; wherein the water inlet C of the second evaporator is connected to the water outlet B of the first condenser through a water pipeline, and the water outlet D of the second evaporator is connected to the water inlet of the user terminal heat exchanger group through a water pipeline; the water tank 22 also includes a domestic water outlet and a domestic water inlet.

[0071] The temperature detection unit 30 includes a first temperature sensor 31, a second temperature sensor 32, a third temperature sensor 33, a fourth temperature sensor 34, a fifth temperature sensor 35 and a sixth temperature sensor 36. The first temperature sensor 31 is arranged at the water outlet B to detect the water temperature To2 at the water outlet of the first condenser, the second temperature sensor 32 is arranged at the water inlet C to detect the water temperature Ti1 at the water inlet of the second evaporator, the third temperature sensor 33 is arranged at the water outlet D to detect the water temperature To1 at the water outlet of the second evaporator, and the fourth temperature sensor 34 is arranged in the second evaporator to detect the water temperature Tw1 of the water heater. The setting position of the fifth temperature sensor 35 is not limited in this application, and is used to measure the outdoor ambient temperature Te of the environment in which the dual heat pump linkage system is located. The sixth temperature sensor 36 is arranged indoors to obtain the indoor heating temperature Tn.

[0072] The flow control valve 40 is arranged at the water outlet D to control the water flow Fs1 entering the user terminal heat exchanger group.

[0073] The linkage controller is used to obtain the working status of the air source heat pump chiller and heater unit 10 and the water ring heat pump hot water unit 20, as well as the temperature information and flow information collected by the temperature detection unit 30 and the flow valve 40; and control the start and close linkage of the air source heat pump chiller and heater unit 10 and the water ring heat pump hot water unit 20 according to the set method. The linkage controller can be a controller independent of the air source heat pump chiller and heater unit 10 and the water ring heat pump hot water unit 20. The linkage controller can also be a first controller set in the air source heat pump chiller and heater unit 10 and a second controller set in the water ring heat pump hot water unit 20, wherein the first controller is at least connected to the first compressor, the circulating water pump 12, the first temperature sensor 31 and the second controller, and the second controller is at least connected to the second compressor, the second temperature sensor 32, the third temperature sensor 33, the fourth temperature sensor 34, the flow control valve 40 and the first controller.

[0074] For details, please refer to Figure 2 The linkage control method based on independent hot water of the present invention includes the following steps.

[0075] S1A obtains the operating status of the water ring heat pump water heater unit:

[0076] If the water ring heat pump water heater is in shutdown or standby state, execute step S2A;

[0077] If the water ring heat pump water heater is in the on state, step S3A is executed.

[0078] S2A obtains the water tank water temperature Tw1 of the water ring heat pump hot water unit. If the water tank water temperature Tw1 is less than or equal to the difference between the set water temperature and the start-stop temperature difference, a start request is sent to the air source heat pump heating and cooling water unit; and after waiting for the first time period t1, if the flow control valve is open, the inlet water temperature Ti1 of the second evaporator of the water ring heat pump hot water unit is greater than or equal to the inlet water temperature threshold and there are no other faults, the water ring heat pump hot water unit is started; in other cases, a fault is reported and the unit is shut down.

[0079] Specifically, it includes the following control logic:

[0080] S2A1 obtains the water temperature Tw1 of the water tank of the water ring heat pump water heater unit:

[0081] If the water temperature Tw1 of the water tank is greater than the difference between the set water temperature and the start-stop temperature difference, the water temperature Tw1 of the water tank is continuously obtained;

[0082] If the water temperature Tw1 of the water tank is less than or equal to the difference between the set water temperature and the start-stop temperature difference, a start-up request is sent to the air source heat pump water chiller and heater, and step S2A2 is executed;

[0083] After S2A2 waits for the first time period t1, it obtains the state of the flow control valve:

[0084] If the flow control valve is closed, the water ring heat pump hot water unit will be reported as a water flow failure and shut down;

[0085] If the flow control valve is open, execute step S2A3;

[0086] S2A3 obtains the water inlet temperature Ti1 of the second evaporator of the water ring heat pump hot water unit:

[0087] If the inlet water temperature Ti1 is less than the inlet water temperature threshold, the inlet water temperature Ti1 is continuously obtained;

[0088] If the inlet water temperature Ti1 is greater than or equal to the inlet water temperature threshold and there is no other fault, the water ring heat pump hot water unit is started. In other cases, other faults of the water ring heat pump hot water unit are reported and the unit is shut down.

[0089] The set water temperature is the target water temperature set by the user.

[0090] The start-stop temperature difference is the difference between the heating return water temperature and the set temperature, which is generally set at 2°C to 3°C.

[0091] The first time period t1 is set to 10s to 15s.

[0092] The water inlet temperature threshold is set to 14°C to 16°C, preferably 15°C.

[0093] S3A obtains the fault status, flow control valve status, inlet water temperature Ti1, outlet water temperature To1 and water tank water temperature Tw1 of the water ring heat pump hot water unit: If there is a fault in the water ring heat pump hot water unit, or the flow control valve is closed, or the inlet water temperature Ti1, outlet water temperature To1, and water tank water temperature Tw1 meet the set shutdown conditions, a shutdown signal is sent to the air source heat pump heating and cooling water unit, and the unit shuts down and reports a fault; otherwise, it operates normally.

[0094] Specifically, it includes the following control logic:

[0095] S3A1 obtains the fault status of the water ring heat pump water heater unit:

[0096] If there is a fault in the water ring heat pump hot water unit, a shutdown signal is sent to the air source heat pump cooling and heating water unit, and other faults of the water ring heat pump hot water unit are reported and stopped;

[0097] If there is no fault in the water ring heat pump water heater, execute step S3A2;

[0098] S3A2 obtains the status of the flow control valve:

[0099] If the flow control valve is closed, a shutdown signal is sent to the air source heat pump cooling and heating water unit, and the water ring heat pump hot water unit is reported to shut down due to water flow failure, and stops running;

[0100] If the flow control valve is open, execute step S3A3;

[0101] S3A23 obtains the inlet water temperature Ti1 and outlet water temperature To1 of the second evaporator of the water ring heat pump hot water unit, and the water tank water temperature Tw1:

[0102] If the inlet water temperature Ti1 is less than or equal to the lower limit of the inlet water temperature, a shutdown signal is sent to the air source heat pump cooling and heating water unit, and the water ring heat pump hot water unit is reported to be shut down due to the low inlet water temperature fault, and stops running;

[0103] If the outlet water temperature To1 is less than or equal to the outlet water temperature lower limit, a shutdown signal is sent to the air source heat pump cooling and heating water unit, and the water ring heat pump hot water unit is reported to shut down due to the outlet water temperature being too low, and stops running;

[0104] If the water temperature Tw1 of the water tank is greater than or equal to the set water temperature and there is no other fault, a shutdown signal is sent to the air source heat pump cooling and heating water unit and the operation is stopped;

[0105] In other cases, the water ring heat pump hot water unit operates normally.

[0106] The lower limit of the water inlet temperature is set to 9°C to 11°C, preferably 10°C.

[0107] The lower limit of the water outlet temperature is set to 6°C to 8°C, preferably 7°C.

[0108] The set water temperature is a target water temperature set by the user, usually 55° C. or other temperatures.

[0109] S1B obtains the operating status of the air source heat pump chiller and heater:

[0110] If the air source heat pump cooling and heating unit is in shutdown or standby state, execute step S2B;

[0111] If the air source heat pump heating and cooling unit is in the heating or cooling operation state, execute step S3B.

[0112] S2B controls the circulation pump to start the second time period t2 according to the startup request signal sent by the water-ring heat pump hot water unit, and determines whether the outdoor ambient temperature Te meets the startup conditions of the heating mode. If so, it controls the startup of the heating mode of the air source heat pump cooling and heating water unit, and continuously monitors whether the indoor heating temperature Tn meets the conditions for exiting the heating mode. If so, it controls the air source heat pump cooling and heating water unit to exit the heating mode.

[0113] Specifically, it includes the following control logic:

[0114] S2B1 obtains the signal sent by the water ring heat pump water heater unit:

[0115] If it is a shutdown signal, the circulating pump is controlled to be in the closed state;

[0116] If it is a power-on signal, the circulating pump is controlled to start for the second time period t2 and then step S3B2 is executed;

[0117] S2B2 obtains the outdoor ambient temperature Te:

[0118] If the outdoor ambient temperature Te is less than or equal to the set heating start temperature, the air source heat pump cooling and heating unit is controlled to start the heating mode, and the heating temperature is set before executing step S2B3;

[0119] If the outdoor ambient temperature Te is greater than the set heating start temperature, execute step S2B1;

[0120] The heating start temperature is set at 17°C to 19°C, preferably 18°C.

[0121] The heating temperature is set at 19°C to 21°C, preferably 20°C.

[0122] S2B3 obtains the indoor heating temperature Tn:

[0123] If the indoor heating temperature Tn is greater than or equal to the sum of the set heating temperature and the allowable temperature fluctuation value, the air source heat pump cooling and heating unit is controlled to exit the heating mode and return to the shutdown or standby state;

[0124] If the indoor heating temperature Tn is less than the sum of the set heating temperature and the allowable temperature fluctuation value, execute step S2B2.

[0125] The allowable temperature fluctuation value is set to 4°C to 6°C, preferably 5°C.

[0126] In another embodiment, when the indoor heating temperature Tn is monitored, the outdoor ambient temperature Te is also continuously monitored, and the step S2B further includes step S2B4:

[0127] S2B4 obtains the outdoor ambient temperature Te:

[0128] If the outdoor ambient temperature Te is greater than or equal to the set heating stop temperature, the air source heat pump cooling and heating unit is controlled to exit the heating mode and return to the shutdown or standby state;

[0129] If the outdoor ambient temperature Te is lower than the set heating stop temperature, execute step S2B3.

[0130] The heating stop temperature is set at 20°C to 22°C.

[0131] The second time period t2 is set to 10s to 15s.

[0132] S3B obtains the signal sent by the water ring heat pump water heater unit:

[0133] If it is a shutdown signal, the circulating pump is controlled to be in the closed state;

[0134] If it is a start-up signal, the circulation pump will be controlled to start.

[0135] The dual heat pump linkage system of the present invention has the following beneficial effects:

[0136] Through a controller that is connected to the inlet and outlet water temperature and flow monitoring sensors of each heat pump unit, the air source heat pump cooling and heating unit and the water ring heat pump hot water unit can be effectively controlled in linkage according to the set linkage control method, which reduces the difficulty of joint control in the existing heat pump system and makes the promotion of joint control easier; at the same time, the two sets of heat pump units only need to be coupled through the circulating water circuit, and they have strong versatility; at the same time, the control method has a heat recovery function and is more energy-saving.

[0137] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present application. The singular forms of "a", "said" and "the" used in the embodiments of the present application and the claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that, unless otherwise specified, "multiple" and "several" refer to two or more; "and / or" refers to and includes any or all possible combinations of one or more associated listed items; "first", "second", "third", etc. are only used to distinguish, rather than to describe a specific order or sequence, and cannot be understood as indicating or implying relative importance. When the above description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. In the description of the present application, for those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0138] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, and the present invention is also intended to include these modifications and modifications.

Claims

1. A dual heat pump linkage system based on independent hot water, comprising an air source heat pump cooling and heating water unit, a water ring heat pump hot water unit and a flow valve connected by a water pipeline, a temperature detection unit, and a linkage controller communicatively connected to the air source heat pump cooling and heating water unit, the water ring heat pump hot water unit, the temperature detection unit and the flow valve, characterized in that: The linkage controller performs linkage control of the air source heat pump cooling and heating water unit and the water ring heat pump hot water unit in the following manner: On the one hand, the operating state of the water ring heat pump water heater unit is obtained: if it is in the off state or standby state, step S2A is executed; if it is in the on state, step S3A is executed; S2A obtains the water tank water temperature Tw1 of the water ring heat pump hot water unit. If the water tank water temperature Tw1 is less than or equal to the difference between the set water temperature and the start-stop temperature difference, a startup request is sent to the air source heat pump cooling and heating water unit; and after waiting for the first time period t1, if the flow control valve is open, the inlet water temperature Ti1 of the second evaporator of the water ring heat pump hot water unit is greater than or equal to the inlet water temperature threshold and there are no other faults, the water ring heat pump hot water unit is started; in other cases, a fault is reported and the unit is shut down; S3A obtains the fault status, flow control valve status, inlet water temperature Ti1, outlet water temperature To1 and water tank water temperature Tw1 of the water ring heat pump hot water unit: if the water ring heat pump hot water unit has a fault, or the flow control valve is closed, or the inlet water temperature Ti1, outlet water temperature To1 and water tank water temperature Tw1 meet the set shutdown conditions, a shutdown signal is sent to the air source heat pump cooling and heating water unit, and the unit shuts down and reports a fault; otherwise, the unit operates normally; On the one hand, the operating state of the air source heat pump chiller and heater is obtained: if it is in shutdown or standby state, step S2B is executed; if it is in heating or cooling operation state, step S3B is executed; S2B controls the circulation pump to start the second time period t2 according to the startup request signal sent by the water-ring heat pump hot water unit, and determines whether the outdoor ambient temperature Te meets the startup condition of the heating mode. If so, it controls the startup of the heating mode of the air source heat pump cooling and heating water unit, and continuously monitors whether the indoor heating temperature Tn meets the conditions for exiting the heating mode. If so, it controls the air source heat pump cooling and heating water unit to exit the heating mode; S3B obtains the signal sent by the water ring heat pump water heater unit: If it is a shutdown signal, the circulating pump is controlled to be in the closed state; If it is a start-up signal, the circulation pump will be controlled to start.

2. The dual heat pump linkage system according to claim 1, characterized in that: The step S2A comprises the following sub-steps: S2A1 obtains the water temperature Tw1 of the water tank of the water ring heat pump water heater unit: If the water temperature Tw1 of the water tank is greater than the difference between the set water temperature and the start-stop temperature difference, the water temperature Tw1 of the water tank is continuously obtained; If the water temperature Tw1 of the water tank is less than or equal to the difference between the set water temperature and the start-stop temperature difference, a start-up request is sent to the air source heat pump water chiller and heater, and step S2A2 is executed; After S2A2 waits for the first time period t1, it obtains the state of the flow control valve: If the flow control valve is closed, the water ring heat pump hot water unit will be reported as a water flow failure and shut down; If the flow control valve is open, execute step S2A3; S2A3 obtains the water inlet temperature Ti1 of the second evaporator of the water ring heat pump hot water unit: If the inlet water temperature Ti1 is less than the inlet water temperature threshold, the inlet water temperature Ti1 is continuously obtained; If the inlet water temperature Ti1 is greater than or equal to the inlet water temperature threshold and there is no other fault, the water ring heat pump hot water unit is started. In other cases, other faults of the water ring heat pump hot water unit are reported and the unit is shut down.

3. The dual heat pump linkage system according to claim 2, characterized in that: The set water temperature is the target water temperature set by the user; the start-stop temperature difference is the difference between the heating return water temperature and the set temperature, and the start-stop temperature difference is set to 2°C to 3°C.

4. The dual heat pump linkage system according to claim 2, characterized in that: The water inlet temperature threshold is set to 14°C to 16°C.

5. The dual heat pump linkage system according to any one of claims 2 to 4, characterized in that: The step S3A comprises the following sub-steps: S3A1 obtains the fault status of the water ring heat pump water heater unit: If there is a fault in the water ring heat pump hot water unit, a shutdown signal is sent to the air source heat pump cooling and heating water unit, and other faults of the water ring heat pump hot water unit are reported and stopped; If there is no fault in the water ring heat pump water heater, execute step S3A2; S3A2 obtains the status of the flow control valve: If the flow control valve is closed, a shutdown signal is sent to the air source heat pump cooling and heating water unit, and the water ring heat pump hot water unit is reported to shut down due to water flow failure, and stops running; If the flow control valve is open, execute step S3A3; S3A23 obtains the inlet water temperature Ti1 and outlet water temperature To1 of the second evaporator of the water ring heat pump hot water unit, and the water tank water temperature Tw1: If the inlet water temperature Ti1 is less than or equal to the lower limit of the inlet water temperature, a shutdown signal is sent to the air source heat pump cooling and heating water unit, and the water ring heat pump hot water unit is reported to be shut down due to the low inlet water temperature fault, and stops running; If the outlet water temperature To1 is less than or equal to the outlet water temperature lower limit, a shutdown signal is sent to the air source heat pump cooling and heating water unit, and the water ring heat pump hot water unit is reported to shut down due to the outlet water temperature being too low, and stops running; If the water temperature Tw1 of the water tank is greater than or equal to the set water temperature and there is no other fault, a shutdown signal is sent to the air source heat pump cooling and heating water unit and the operation is stopped; In other cases, the water ring heat pump hot water unit operates normally.

6. The dual heat pump linkage system according to claim 5, characterized in that: The lower limit of the water inlet temperature is set to 9°C to 11°C; the lower limit of the water outlet temperature is set to 6°C to 8°C.

7. The dual heat pump linkage system according to any one of claims 1, 2, 3, 4, and 6, characterized in that: The step S2B comprises the following sub-steps: S2B1 obtains the signal sent by the water ring heat pump water heater unit: If it is a shutdown signal, the circulating pump is controlled to be in the closed state; If it is a power-on signal, the circulating pump is controlled to start for the second time period t2 and then step S3B2 is executed; S2B2 obtains the outdoor ambient temperature Te: If the outdoor ambient temperature Te is less than or equal to the set heating start temperature, the air source heat pump cooling and heating unit is controlled to start the heating mode, and the heating temperature is set before executing step S2B3; If the outdoor ambient temperature Te is greater than the set heating start temperature, execute step S2B1; S2B3 obtains the indoor heating temperature Tn: If the indoor heating temperature Tn is greater than or equal to the sum of the set heating temperature and the allowable temperature fluctuation value, the air source heat pump cooling and heating unit is controlled to exit the heating mode and return to the shutdown or standby state; In other cases, execute step S2B2.

8. The dual heat pump linkage system according to any one of claims 1, 2, 3, 4, and 6, characterized in that: The step S2B includes the following sub-steps. S2B1 obtains the signal sent by the water ring heat pump water heater unit: If it is a shutdown signal, the circulating pump is controlled to be in the closed state; If it is a power-on signal, the circulating pump is controlled to start for the second time period t2 and then step S3B2 is executed; S2B2 obtains the outdoor ambient temperature Te: If the outdoor ambient temperature Te is less than or equal to the set heating start temperature, the air source heat pump cooling and heating unit is controlled to start the heating mode, and the heating temperature is set before executing step S2B3; If the outdoor ambient temperature Te is greater than the set heating start temperature, execute step S2B1; S2B3 obtains the indoor heating temperature Tn: If the indoor heating temperature Tn is greater than or equal to the sum of the set heating temperature and the allowable temperature fluctuation value, the air source heat pump cooling and heating unit is controlled to exit the heating mode and return to the shutdown or standby state; If the indoor heating temperature Tn is less than the sum of the set heating temperature and the allowable temperature fluctuation value, execute step S2B4; S2B4 obtains the outdoor ambient temperature Te: If the outdoor ambient temperature Te is greater than or equal to the set heating stop temperature, the air source heat pump cooling and heating unit is controlled to exit the heating mode and return to the shutdown or standby state; If the outdoor ambient temperature Te is lower than the set heating stop temperature, execute step S2B3.

9. The dual heat pump linkage system according to claim 8, characterized in that: The heating stop temperature is set at 20°C to 22°C.

10. The dual heat pump linkage system according to claim 1, characterized in that: The linkage controller includes a first controller arranged in an air source heat pump chiller and heater unit and a second controller arranged in a water ring heat pump hot water unit, wherein the first controller is at least communicatively connected to a temperature detection unit and a second controller, and the second controller is at least communicatively connected to a temperature detection unit, a flow control valve and the first controller.

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