Heat pump system based on proportional water mixing valve

Abstract

The utility model discloses a heat pump system based on a proportional water mixing valve. The heat pump system comprises a rack; a water tank; the heat pump frequency conversion host is used for adjusting the water temperature of the water tank; the plurality of temperature control modules are respectively arranged in different indoor areas, and each temperature control module comprises a water pump, a proportional water mixing valve and end equipment; the main control board is provided with a first communication port, and the main control board is used for controlling the heat pump frequency conversion host; the expansion board is provided with a control chip, a second communication port, a plurality of first control ports and a plurality of second control ports, the second communication port, the first control ports and the second control ports are electrically connected with the control chip, the second communication port is in communication connection with the first communication port, the first control ports are connected with the corresponding water pumps, and the second control ports are connected with the corresponding water pumps. And the plurality of second control ports are respectively connected with the input ends of the corresponding proportional water mixing valves. According to the embodiment of the utility model, the wiring difficulty and the wiring cost can be reduced, and the temperature regulation and control precision can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat pump systems, in particular to a heat pump system based on a proportional water mixing valve. Background Art

[0002] A heat pump is a device that transfers heat from a substance or space at a lower temperature to another substance or space at a higher temperature. Heat pump systems are commonly used for heating and cooling.

[0003] At present, traditional heat pump systems use a single control panel to simultaneously control the temperature of the heat pump host and the indoor area. However, the control panel is usually located near the heat pump host, while the indoor area and the heat pump host are located in different locations, which makes wiring between the temperature control devices in the indoor area and the control panel more difficult. When the heat pump system heats or cools multiple indoor areas, the wiring cost will increase further, and the control panel has low temperature control accuracy for each indoor area. Utility Model Content

[0004] The following is a summary of the subject matter described in detail herein; this summary is not intended to limit the scope of the claims.

[0005] The utility model provides a heat pump system based on a proportional water mixing valve, which can reduce wiring difficulty and wiring cost, and improve temperature control accuracy.

[0006] The utility model provides a heat pump system based on a proportional water mixing valve, comprising: a water tank; a heat pump variable frequency host, the heat pump variable frequency host is used to adjust the water temperature of the water tank; a plurality of temperature control modules, which are respectively arranged in different indoor areas, each of the temperature control modules comprises a water pump, a proportional water mixing valve and a terminal device, the proportional water mixing valve is provided with a first water inlet valve port, a second water inlet valve port and a water outlet valve port, the water outlet of the water tank, the water pump and the corresponding first water inlet valve port are connected in sequence, the water outlet valve port is connected with the corresponding water inlet of the terminal device, the second water inlet valve port is connected with the water inlet of the water tank They are all connected to the water outlet of the corresponding terminal device; a main control board is provided with a first communication port, and the main control board is used to control the heat pump variable frequency host; an expansion board is provided with a control chip, a second communication port, a plurality of first control ports and a plurality of second control ports, the second communication port, the first control port and the second control port are respectively electrically connected to the control chip, the second communication port is communicatively connected to the first communication port, a plurality of the first control ports are respectively connected to the corresponding water pumps, and a plurality of the second control ports are respectively connected to the input end of the corresponding proportional mixing valve.

[0007] In some embodiments, each of the temperature control modules includes a first water temperature sensor, which is arranged in a pipe connecting the water outlet valve port and the water inlet of the corresponding terminal device. The expansion board is provided with multiple collection ports, which are electrically connected to the control chip, and the multiple collection ports are respectively connected to the corresponding first water temperature sensors.

[0008] In some embodiments, the control chip is provided with multiple PWM output ports, and the expansion board is provided with multiple signal conversion circuits. The PWM output ports are connected to the corresponding second control ports through the corresponding signal conversion circuits. The PWM output ports are used to output PWM control signals, and the signal conversion circuits are used to convert the PWM control signals into voltage control signals.

[0009] In some embodiments, the signal conversion circuit includes an amplifier, a non-inverting input terminal of the amplifier is electrically connected to the PWM output port, and an output terminal of the amplifier is electrically connected to the second control port.

[0010] In some embodiments, the signal conversion circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, and a fifth capacitor. One end of the first resistor is connected to the PWM output port, the other end of the first resistor is connected to one end of the second resistor, the other end of the second resistor is connected to the in-phase input terminal of the amplifier, one end of the second resistor is grounded through the first capacitor, the other end of the second resistor is grounded through the second capacitor, one end of the third resistor is connected to the inverting input terminal of the amplifier, the other end of the third resistor is connected to the output terminal of the amplifier, the third capacitor is connected in parallel with the third resistor, the inverting input terminal of the amplifier is grounded through the fourth resistor, one end of the fifth resistor is connected to the output terminal of the amplifier, the other end of the fifth resistor is connected to the sixth resistor, the other end of the sixth resistor is connected to the second control port, one end of the sixth resistor is grounded through the fourth capacitor, the other end of the sixth resistor is grounded through the fifth capacitor, and the seventh resistor is connected in parallel with the fifth capacitor.

[0011] In some embodiments, the expansion board is provided with a plurality of opening detection ports, the opening detection ports are connected to the control chip, and the plurality of opening detection ports are respectively connected to feedback ends of the corresponding proportional water mixing valves.

[0012] In some embodiments, the expansion board is provided with a cooling mode switch and a heating mode switch, and the cooling mode switch and the heating mode switch are respectively connected to the control chip.

[0013] In some embodiments, the main control board includes a main control module, and the first communication port and the heat pump variable frequency host are electrically connected to the main control module respectively.

[0014] In some embodiments, a control panel is further included, the main control panel is provided with a third communication port, the third communication port is electrically connected to the main control module, and the control panel is electrically connected to the third communication port.

[0015] In some embodiments, a second water temperature sensor is disposed in the water tank, and the second water temperature sensor is electrically connected to the main control module.

[0016] The embodiments of the present application include at least the following beneficial effects: by placing a temperature control module in each indoor area, the control chip independently controls the temperature of each indoor area, thereby effectively improving the temperature control accuracy of each indoor area; specifically, the water supply of the water tank to the terminal device is accurately controlled by the proportional water mixing valve, thereby further improving the temperature control accuracy of each indoor area; the water supply temperature of the terminal device can be adjusted according to actual needs, thereby making the heat pump system run more efficiently and avoiding unnecessary energy waste; at the same time, a main control board for controlling the heat pump variable frequency host and an extension board for controlling the temperature control module are provided; the extension board and the main control board are connected through communication to realize remote data interaction; specifically, the water pump and the proportional water mixing valve located in each indoor area are controlled by the control chip on the extension board, thereby effectively reducing the wiring difficulty and wiring cost, thereby reducing the installation cost and maintenance difficulty of the heat pump system; the extension board can also be used to quickly debug the temperature control modules in each indoor area, thereby improving the debugging efficiency.

[0017] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by practicing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures specifically pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the technical solution of the utility model and constitute a part of the specification. Together with the embodiments of the utility model, they are used to explain the technical solution of the utility model and do not constitute a limitation on the technical solution of the utility model.

[0019] Figure 1 An optional system block diagram of a heat pump system based on a proportional water mixing valve provided in an embodiment of the present application;

[0020] Figure 2 An optional structural diagram of a main control board provided in an embodiment of the present application;

[0021] Figure 3A schematic diagram of an optional structure of an expansion board provided in an embodiment of the present application;

[0022] Figure 4 A schematic diagram of an optional structure of a heat pump system based on a proportional water mixing valve provided in an embodiment of the present application;

[0023] Figure 5 A schematic diagram of an optional structure of a control chip provided in an embodiment of the present application;

[0024] Figure 6 An optional structural diagram of a signal conversion circuit provided in an embodiment of the present application;

[0025] Figure 7 A schematic diagram of an optional structure of a control chip provided in an embodiment of the present application;

[0026] Figure 8 An optional structural diagram of a main control module provided in an embodiment of the present application;

[0027] Fig. 9 Another optional structural diagram of the main control module provided in the embodiment of the present application. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0029] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0031] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0032] At present, traditional heat pump systems use a single control panel to simultaneously control the temperature of the heat pump host and the indoor area. However, the control panel is usually located near the heat pump host, while the indoor area and the heat pump host are located in different locations, which makes wiring between the temperature control devices in the indoor area and the control panel more difficult. When the heat pump system heats or cools multiple indoor areas, the wiring cost will increase further, and the control panel has low temperature control accuracy for each indoor area.

[0033] In view of the problems of greater wiring difficulty, greater wiring cost, and lower temperature control accuracy, the utility model provides a heat pump system based on a proportional water mixing valve. The heat pump system based on the proportional water mixing valve comprises: a water tank; a heat pump frequency conversion host, the heat pump frequency conversion host is used to adjust the water temperature of the water tank; a plurality of temperature control modules are respectively arranged in different indoor areas, each temperature control module comprises a water pump, a proportional water mixing valve and a terminal device, the proportional water mixing valve is provided with a first water inlet valve port, a second water inlet valve port and a water outlet valve port, the water outlet of the water tank, the water pump and the corresponding first water inlet valve port are connected in sequence, and the water outlet valve port is connected to the corresponding The water inlet of the terminal device is connected, and the second water inlet valve port and the water inlet of the water tank are both connected to the water outlet of the corresponding terminal device; the main control board is provided with a first communication port, and the main control board is used to control the heat pump variable frequency host; the expansion board is provided with a control chip, a second communication port, multiple first control ports and multiple second control ports, the second communication port, the first control port and the second control port are respectively electrically connected to the control chip, the second communication port is communicatively connected to the first communication port, the multiple first control ports are respectively connected to the corresponding water pumps, and the multiple second control ports are respectively connected to the input ends of the corresponding proportional mixing valves. According to the solution provided by the embodiment of the utility model, by placing a temperature control module in each indoor area, the control chip independently controls the temperature of each indoor area, thereby effectively improving the temperature control accuracy of each indoor area. Specifically, the water supply of the water tank to the terminal device is accurately controlled by the proportional water mixing valve, thereby further improving the temperature control accuracy of each indoor area. The water supply temperature of the terminal device can be adjusted according to actual needs, so that the operation of the heat pump system is more efficient and unnecessary energy waste is avoided. At the same time, a main control board for controlling the heat pump variable frequency host and an extension board for controlling the temperature control module are provided. The extension board and the main control board are connected by communication to realize remote data interaction. Specifically, the water pump and the proportional water mixing valve located in each indoor area are controlled by the control chip on the extension board, which can effectively reduce the wiring difficulty and wiring cost, thereby reducing the installation cost and maintenance difficulty of the heat pump system. The extension board can also be used to quickly debug the temperature control modules in each indoor area to improve the debugging efficiency.

[0034] The following is a further description of the embodiments of the present invention in conjunction with the accompanying drawings.

[0035] Reference Figures 1 to 4 The present invention provides a heat pump system based on a proportional water mixing valve, comprising:

[0036] Water tank 100;

[0037] The heat pump variable frequency host 200 is used to adjust the water temperature of the water tank 100;

[0038] A plurality of temperature control modules 300 are respectively arranged in different indoor areas, each temperature control module 300 includes a water pump 310, a proportional water mixing valve 320 and a terminal device 330, the proportional water mixing valve 320 is provided with a first water inlet valve port 321, a second water inlet valve port 322 and a water outlet valve port 323, the water outlet of the water tank 100, the water pump 310 and the corresponding first water inlet valve port 321 are sequentially connected, the water outlet valve port 323 is connected to the water inlet of the corresponding terminal device 330, and the second water inlet valve port 322 and the water inlet of the water tank 100 are both connected to the water outlet of the corresponding terminal device 330;

[0039] The main control board 400 is provided with a first communication port 420, and the main control board 400 is used to control the heat pump variable frequency host 200;

[0040] The expansion board 500 is provided with a control chip 510, a second communication port 520, multiple first control ports 530 and multiple second control ports 540. The second communication port 520, the first control port 530 and the second control port 540 are electrically connected to the control chip 510 respectively, the second communication port 520 is communicatively connected to the first communication port 420, the multiple first control ports 530 are respectively connected to the corresponding water pumps 310, and the multiple second control ports 540 are respectively connected to the input ends of the corresponding proportional mixing valves 320.

[0041] Among them, the terminal device 330 refers to a device responsible for exchanging heat between the heat pump system and the environment of the indoor area. The terminal device 330 adjusts the air temperature of the indoor area by absorbing or releasing heat. For example, the terminal device 330 may include an air-conditioning unit, a fan coil, a radiator, a radiator, etc.; relevant personnel need to set the set temperature of the terminal device 330 based on the expected temperature of the indoor area, and the terminal device 330 is usually in different working modes when absorbing heat and releasing heat, so it is necessary to set the working mode of the terminal device 330. For example, the mode when the terminal device 330 absorbs heat can be defined as a cooling mode, and the mode when the terminal device 330 releases heat can be defined as a heating mode; the indoor area can include rooms, living rooms, kitchens, offices, etc.

[0042] It can be understood that by placing a temperature control module 300 in each indoor area, the control chip 510 independently controls the temperature of each indoor area, effectively improving the temperature control accuracy of each indoor area. Specifically, the proportional mixing valve 320 accurately controls the water supply of the water tank 100 to the terminal device 330, further improving the temperature control accuracy of each indoor area, and can adjust the water supply temperature of the terminal device 330 according to actual needs, so that the heat pump system can operate more efficiently and avoid unnecessary energy waste. At the same time, a main control board 400 for controlling the heat pump variable frequency host 200 and an expansion board 500 for controlling the temperature control module 300 are provided. The expansion board 500 and the main control board 400 are connected through communication to realize remote data interaction. Specifically, the control chip 510 on the expansion board 500 controls the water pump 310 and the proportional mixing valve 320 located in each indoor area, which can effectively reduce the wiring difficulty and wiring cost, thereby reducing the installation cost and maintenance difficulty of the heat pump system. The expansion board 500 can also be used to quickly debug the temperature control module 300 in each indoor area to improve the debugging efficiency.

[0043] In addition, refer to Figure 3 and Figure 7 In some embodiments of the utility model, each temperature control module 300 includes a first water temperature sensor 340, and the first water temperature sensor 340 is arranged in a pipeline connecting the water outlet valve port 323 and the water inlet of the corresponding terminal device 330. The expansion board 500 is provided with a plurality of collection ports 550, and the collection port 550 is electrically connected to the control chip 510, and the plurality of collection ports 550 are respectively connected to the corresponding first water temperature sensors 340.

[0044] Based on this, the first water temperature sensor 340 is set in the pipeline between the water outlet valve port 323 and the water inlet of the corresponding terminal device 330. The first water temperature sensor 340 is used to detect the water supply temperature of the terminal device 330. The control chip 510 can obtain the water temperature detected by the first water temperature sensor 340, so as to accurately adjust the proportional mixing valve 320 and the water pump 310, ensuring that the heat pump system can accurately adjust the water temperature according to the actual needs of each area, thereby improving the comfort and temperature control efficiency of the entire system.

[0045] In addition, refer to Figure 5 and Figure 6 The control chip 510 is provided with a plurality of PWM output ports 511, and the expansion board 500 is provided with a plurality of signal conversion circuits 560. The PWM output port 511 is connected to the corresponding second control port 540 through the corresponding signal conversion circuit 560. The PWM output port 511 is used to output a PWM control signal, and the signal conversion circuit 560 is used to convert the PWM control signal into a voltage control signal.

[0046] Based on this, the control chip 510 can output a high-precision PWM control signal through the PWM output port 511. Under the action of the signal conversion circuit 560, the PWM control signal can be converted into a voltage control signal that is compatible with the proportional mixing valve 320, so that the control chip 510 can perform high-precision regulation of the proportional mixing valve 320, thereby improving the temperature control accuracy of each indoor area.

[0047] Specifically, the control chip 510 can output a high-frequency (1000 Hz) and high-precision (0.01%) PWM control signal, and under the action of the signal conversion circuit 560, can output a voltage control signal of 0 to 10V.

[0048] In addition, refer to Figure 5 and Figure 6 The signal conversion circuit 560 includes an amplifier 561 , a non-inverting input terminal of the amplifier 561 is electrically connected to the PWM output port 511 , and an output terminal of the amplifier 561 is electrically connected to the second control port 540 .

[0049] Based on this, under the action of the amplifier 561, the PWM control signal output by the PWM output port 511 can be adjusted so that the output signal can adapt to the voltage requirement of the proportional mixing valve 320, thereby increasing the applicability and flexibility of the system.

[0050] In addition, refer to Figure 5 and Figure 6 The signal conversion circuit 560 includes a first resistor R15, a second resistor R16, a third resistor R21, a fourth resistor R22, a fifth resistor R25, a sixth resistor R52, a seventh resistor R45, a first capacitor C33, a second capacitor C34, a third capacitor C3, a fourth capacitor C7, and a fifth capacitor C30. One end of the first resistor R15 is connected to the PWM output port 511, the other end of the first resistor R15 is connected to one end of the second resistor R16, the other end of the second resistor R16 is connected to the non-inverting input terminal of the amplifier 561, one end of the second resistor R16 is grounded through the first capacitor C33, and the other end of the second resistor R16 is connected to the PWM output port 511 through the second capacitor C34. The third resistor R21 is connected to the inverting input terminal of the amplifier 561, the other end of the third resistor R21 is connected to the output terminal of the amplifier 561, the third capacitor C3 is connected to the third resistor R21 in parallel, the inverting input terminal of the amplifier 561 is grounded through the fourth resistor R22, one end of the fifth resistor R25 is connected to the output terminal of the amplifier 561, the other end of the fifth resistor R25 is connected to the sixth resistor R52, the other end of the sixth resistor R52 is connected to the second control port 540, one end of the sixth resistor R52 is grounded through the fourth capacitor C7, the other end of the sixth resistor R52 is grounded through the fifth capacitor C30, and the seventh resistor R45 is connected to the fifth capacitor C30 in parallel.

[0051] Based on this, in the signal conversion circuit 560, under the action of the first resistor R15, the second resistor R16, the first capacitor C33 and the second capacitor C34, the PWM control signal output from the PWM output port 511 can be effectively filtered, the combination of the third resistor R21 and the third capacitor C3 can control the frequency response and stability of the amplifier 561, the third resistor R21 and the third capacitor C3 will also affect the overall gain of the amplifier 561, the inverting input terminal of the amplifier 561 is grounded through the fourth resistor R22 to provide a reference potential, the combination of the fifth resistor R25, the sixth resistor R52, the seventh resistor R45, the fourth capacitor C7 and the fifth capacitor C30 can play an effective filtering role, thereby improving the quality of the voltage control signal output by the signal conversion circuit 560.

[0052] In addition, refer to Figure 2 The expansion board 500 is provided with a plurality of opening detection ports 570 , the opening detection ports 570 are connected to the control chip 510 , and the plurality of opening detection ports 570 are respectively connected to the feedback ends of the corresponding proportional water mixing valves 320 .

[0053] Based on this, the control chip 510 obtains the opening ratio signal fed back by the proportional mixing valve 320 through the opening detection port 570. The control chip 510 can monitor the opening ratio of the proportional mixing valve 320 in real time, thereby determining the degree of matching between the actual opening ratio and the expected opening ratio of the proportional mixing valve 320, so that the heat pump system can accurately control the opening ratio of the proportional mixing valve 320, thereby improving the temperature control accuracy of each indoor area, and can also promptly know whether the heat pump system has a fault.

[0054] In addition, refer to Figure 2 The expansion board 500 is provided with a cooling mode switch 581 and a heating mode switch 582 , and the cooling mode switch 581 and the heating mode switch 582 are respectively connected to the control chip 510 .

[0055] Based on this, the cooling mode and the heating mode can be switched directly on the expansion board 500 to improve the convenience of operation. When a software control failure occurs, the mode can be switched through the cooling mode switch 581 and the heating mode switch 582 to improve the safety of the system. In addition, during system maintenance or troubleshooting, technicians can directly use the cooling mode switch 581 and the heating mode switch 582 to manually control the system to enter a specific mode, which is convenient for testing and diagnosing problems.

[0056] In addition, refer to Figure 8 and Fig. 9 The main control board 400 includes a main control module 410 , and the first communication port 420 and the heat pump variable frequency host 200 are electrically connected to the main control module 410 respectively.

[0057] Based on this, by setting up the main control module 410, the control effect of the heat pump variable frequency host 200 can be improved. The main control module 410 can be electrically connected to the various components of the heat pump variable frequency host 200 through multiple control ports on the main control board 400, so that the main control module 410 effectively controls the various components of the heat pump variable frequency host 200.

[0058] In addition, refer to Figure 8 and Fig. 9 , further comprising a control panel 600 , the main control board 400 is provided with a third communication port 430 , the third communication port 430 is electrically connected to the main control module 410 , and the control panel 600 is electrically connected to the third communication port 430 .

[0059] Based on this, by setting the control panel 600, the intuitiveness and convenience of the control process of the heat pump system can be improved, thereby improving the control efficiency of the heat pump system.

[0060] In addition, refer to Fig. 9 A second water temperature sensor 110 is disposed in the water tank 100 , and the second water temperature sensor 110 is electrically connected to the main control module 410 .

[0061] Based on this, the second water temperature sensor 110 can detect the water temperature in the water tank 100, the main control module 410 can obtain the water temperature detected by the second water temperature sensor 110, and the main control module 410 can accurately adjust the water temperature in the water tank 100 by controlling the heat pump variable frequency host 200, so that the water temperature in the water tank 100 can meet the temperature requirements of each indoor area.

[0062] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A heat pump system based on a proportional water mixing valve, characterized in that: include: Water tank; A heat pump variable frequency host, the heat pump variable frequency host is used to adjust the water temperature of the water tank; A plurality of temperature control modules are respectively arranged in different indoor areas, each of the temperature control modules comprises a water pump, a proportional water mixing valve and a terminal device, the proportional water mixing valve is provided with a first water inlet valve port, a second water inlet valve port and a water outlet valve port, the water outlet of the water tank, the water pump and the corresponding first water inlet valve port are sequentially connected, the water outlet valve port is connected with the corresponding water inlet of the terminal device, and the second water inlet valve port and the water inlet of the water tank are both connected with the corresponding water outlet of the terminal device; A main control board is provided with a first communication port, and the main control board is used to control the heat pump variable frequency host; An expansion board is provided with a control chip, a second communication port, a plurality of first control ports and a plurality of second control ports, wherein the second communication port, the first control port and the second control port are electrically connected to the control chip respectively, the second communication port is communicatively connected to the first communication port, a plurality of the first control ports are respectively connected to the corresponding water pumps, and a plurality of the second control ports are respectively connected to the input ends of the corresponding proportional water mixing valves.

2. A heat pump system based on a proportional water mixing valve according to claim 1, characterized in that: Each of the temperature control modules includes a first water temperature sensor, which is arranged in a pipe connecting the water outlet valve port and the water inlet of the corresponding terminal device. The expansion board is provided with multiple collection ports, which are electrically connected to the control chip, and the multiple collection ports are respectively connected to the corresponding first water temperature sensors.

3. A heat pump system based on a proportional water mixing valve according to claim 1, characterized in that: The control chip is provided with multiple PWM output ports, and the expansion board is provided with multiple signal conversion circuits. The PWM output ports are connected to the corresponding second control ports through the corresponding signal conversion circuits. The PWM output ports are used to output PWM control signals, and the signal conversion circuits are used to convert the PWM control signals into voltage control signals.

4. A heat pump system based on a proportional water mixing valve according to claim 3, characterized in that: The signal conversion circuit includes an amplifier, a non-inverting input terminal of the amplifier is electrically connected to the PWM output port, and an output terminal of the amplifier is electrically connected to the second control port.

5. A heat pump system based on a proportional water mixing valve according to claim 4, characterized in that: The signal conversion circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, and a fifth capacitor. One end of the first resistor is connected to the PWM output port, the other end of the first resistor is connected to one end of the second resistor, the other end of the second resistor is connected to the non-inverting input end of the amplifier, one end of the second resistor is grounded through the first capacitor, the other end of the second resistor is grounded through the second capacitor, one end of the third resistor is connected to the inverting input end of the amplifier, the other end of the third resistor is connected to the output end of the amplifier, the third capacitor is connected in parallel with the third resistor, the inverting input end of the amplifier is grounded through the fourth resistor, one end of the fifth resistor is connected to the output end of the amplifier, the other end of the fifth resistor is connected to the sixth resistor, the other end of the sixth resistor is connected to the second control port, one end of the sixth resistor is grounded through the fourth capacitor, the other end of the sixth resistor is grounded through the fifth capacitor, and the seventh resistor is connected in parallel with the fifth capacitor.

6. A heat pump system based on a proportional water mixing valve according to claim 1, characterized in that: The expansion board is provided with a plurality of opening detection ports, the opening detection ports are connected to the control chip, and the plurality of opening detection ports are respectively connected to the feedback ends of the corresponding proportional water mixing valves.

7. A heat pump system based on a proportional water mixing valve according to claim 1, characterized in that: The expansion board is provided with a cooling mode switch and a heating mode switch, and the cooling mode switch and the heating mode switch are respectively connected to the control chip.

8. A heat pump system based on a proportional water mixing valve according to claim 1, characterized in that: The main control board includes a main control module, and the first communication port and the heat pump variable frequency host are electrically connected to the main control module respectively.

9. A heat pump system based on a proportional water mixing valve according to claim 8, characterized in that: It also includes a control panel, the main control panel is provided with a third communication port, the third communication port is electrically connected to the main control module, and the control panel is electrically connected to the third communication port.

10. A heat pump system based on a proportional water mixing valve according to claim 8, characterized in that: A second water temperature sensor is arranged in the water tank, and the second water temperature sensor is electrically connected to the main control module.

Images