WO2023103968A1

WO2023103968A1 - Air source heat pump system

Info

Publication number: WO2023103968A1
Application number: PCT/CN2022/136619
Authority: WO
Inventors: 李东哲; 潘翠连; 管清杭; 陈卫星; 宋振兴
Original assignee: 青岛海信日立空调系统有限公司
Priority date: 2021-12-07
Filing date: 2022-12-05
Publication date: 2023-06-15

Abstract

Provided in the present disclosure is an air source heat pump system. The air source heat pump system comprises a compressor, a water-side heat exchanger, an air-side heat exchanger, a four-way valve, a one-way valve, an electronic expansion valve, and an outdoor electromechanical control panel. The compressor comprises an air exhaust port and an air return port. The air-side heat exchanger is connected to the water-side heat exchanger. Four ports of the four-way valve are respectively connected to the air exhaust port of the compressor, the air return port of the compressor, the water-side heat exchanger, and the air-side heat exchanger. The one-way valve is connected between the air exhaust port of the compressor and the four-way valve, and the compressor is in unidirectional conduction with the four-way valve. The electronic expansion valve is connected between the air-side heat exchanger and the water-side heat exchanger. The outdoor electromechanical control panel is connected to the compressor and the electronic expansion valve, and is configured to close the electronic expansion valve and control the compressor to remain open, when receiving a shutdown signal; and turn off the compressor when it is determined that a shutdown condition is satisfied.

Description

Air source heat pump system

This application claims priority to the Chinese patent application with application number 202123050748.7, filed on December 7, 2021, and the Chinese patent application with application number 202210642290.4, filed on June 8, 2022, the entire contents of which are incorporated by reference in this application .

technical field

The present disclosure relates to the technical field of household appliances, in particular to an air source heat pump system.

Background technique

The air source heat pump includes an air source heat pump unit and indoor terminal equipment, and the air source heat pump unit includes an outdoor unit and a water-side heat exchanger connected to the outdoor unit. The refrigerant side of the water side heat exchanger receives the cold heat produced by the outdoor unit and transfers the cold heat to the water outlet side, and the water outlet side of the water side heat exchanger supplies circulating cold and hot water to the indoor terminal equipment through the water circulation pipeline . Indoor terminal equipment includes fan coils (referred to as fan coils), floor heating coils (referred to as floor heating) or radiators, and domestic water tanks.

Contents of the invention

The present disclosure provides an air source heat pump system. The air source heat pump system includes a compressor, a water side heat exchanger, an air side heat exchanger, a four-way valve, a one-way valve, an electronic expansion valve, and an outdoor unit electric control board. The compressor includes a discharge port and a return port. The air-side heat exchanger is connected to the water-side heat exchanger. The four ports of the four-way valve are respectively connected with the exhaust port of the compressor, the air return port of the compressor, the water-side heat exchanger and the air-side heat exchanger. The one-way valve is connected between the exhaust port of the compressor and the four-way valve, and the compressor is connected to the four-way valve in one direction. The electronic expansion valve is connected between the air-side heat exchanger and the water-side heat exchanger. The electric control board of the outdoor unit is connected with the compressor and the electronic expansion valve, and is configured to close the electronic expansion valve and control the compressor to keep on when receiving a shutdown signal. When it is determined that the shutdown condition is met, the compressor is turned off.

Description of drawings

In order to illustrate the technical solutions in the present disclosure more clearly, the following will briefly introduce the accompanying drawings required in some embodiments of the present disclosure. Obviously, the accompanying drawings in the following description are only appendices to some embodiments of the present disclosure. Figures, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings. In addition, the drawings in the following description can be regarded as schematic diagrams, and are not limitations on the actual size of the product involved in the embodiments of the present disclosure, the actual process of the method, the actual timing of signals, and the like.

1 is a block diagram of an air source heat pump system according to some embodiments;

Fig. 2 is a structural diagram of a relay reversing device of an air source heat pump system according to some embodiments, showing a straight-through flow direction;

Fig. 3 is a structural diagram of a relay reversing device of an air source heat pump system according to some embodiments, showing a bypass flow direction;

Fig. 4 is a structural diagram of an outdoor unit and a water-side heat exchanger of an air source heat pump system according to some embodiments;

Fig. 5 is a schematic diagram of refrigerant circulation during cooling operation of the air source heat pump system according to some embodiments;

Fig. 6 is a schematic diagram of refrigerant circulation during heating operation of the air source heat pump system according to some embodiments;

Fig. 7 is a time sequence diagram of the control principle of an air source heat pump system according to some embodiments;

Fig. 8 is a timing diagram of another control principle of an air source heat pump system according to some embodiments;

Fig. 9 is a structural diagram of an auxiliary liquid storage pipe section in an air source heat pump system according to some embodiments;

Fig. 10 is a flowchart of the control principle of the air source heat pump system according to some embodiments;

Fig. 11 is a flowchart of a method for determining the internal volume of an auxiliary liquid storage pipe section in an air source heat pump system according to some embodiments;

Fig. 12 is a flowchart of another method for determining the internal volume of the auxiliary liquid storage pipe section in the air source heat pump system according to some embodiments;

Fig. 13 is a structural block diagram of an air source heat pump system according to some embodiments.

In the attached picture:

101-outdoor unit; 11-compressor; 110-exhaust port; 111-air return port; 12-four-way valve; 13-outdoor unit electric control board; 14-air side heat exchanger; 15-one-way valve; 16 -Auxiliary liquid storage pipe section; 17-electronic expansion valve; 18-fan; 19-high pressure switch; 20-low pressure switch;

102-water side heat exchanger; 1021-first refrigerant port; 1022-second refrigerant port; OUT-heat pump water supply port; IN-heat pump return water port;

205-Indoor terminal equipment; 2051-Hot water tank; 2050-Space heating/cooling equipment; 2052-Fan plate; 2053-Floor heating;

201-relay reversing device; A'-the second water inlet; B'-the fourth water outlet; C'-the second water return port; D'-the third water outlet; 210-the first straight branch; 220 - the first bypass branch; 221 - the first bypass branch; 222 - the second bypass branch; 230 - the second straight branch; 240 - the second bypass branch; 241 - the third bypass branch; 242 - the fourth bypass branch; 2011- the first electric three-way valve; 2012- the second electric three-way valve; 2013- the third electric three-way valve; 2014- the fourth electric three-way valve; 2015- the first booster pump ;2016-second booster pump; 203-fifth electric three-way valve; 204-sixth electric three-way valve; P1-first port; P2-second port; P3-third port;

202-buffer water tank; A-first water inlet; B-first water outlet; C-first water return port; D-second water outlet.

Detailed ways

The technical solutions in some embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present disclosure, not all of them. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments provided in the present disclosure belong to the protection scope of the present disclosure.

Throughout the specification and claims, unless the context requires otherwise, the term "comprise" and other forms such as the third person singular "comprises" and the present participle "comprising" are used Interpreted as the meaning of openness and inclusion, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific examples" example)" or "some examples (some examples)" etc. are intended to indicate that specific features, structures, materials or characteristics related to the embodiment or examples are included in at least one embodiment or example of the present disclosure. Schematic representations of the above terms are not necessarily referring to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be included in any suitable manner in any one or more embodiments or examples.

Hereinafter, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

In describing some embodiments, the expressions "coupled" and "connected" and their derivatives may be used. The term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral body; it can be a direct connection or an indirect connection through an intermediary. For example, the term "connected" may be used in describing some embodiments to indicate that two or more elements are in direct physical or electrical contact with each other. As another example, the term "coupled" may be used when describing some embodiments to indicate that two or more elements are in direct physical or electrical contact. However, the terms "coupled" or "communicatively coupled" may also mean that two or more elements are not in direct contact with each other, but yet still co-operate or interact with each other. The embodiments disclosed herein are not necessarily limited by the context herein.

"At least one of A, B and C" has the same meaning as "at least one of A, B or C" and both include the following combinations of A, B and C: A only, B only, C only, A and B A combination of A and C, a combination of B and C, and a combination of A, B and C.

"A and/or B" includes the following three combinations: A only, B only, and a combination of A and B.

As used herein, the term "if" is optionally interpreted to mean "when" or "at" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined that ..." or "if [the stated condition or event] is detected" are optionally construed to mean "when determining ..." or "in response to determining ..." depending on the context Or "upon detection of [stated condition or event]" or "in response to detection of [stated condition or event]".

The use of "suitable for" or "configured to" herein means open and inclusive language that does not exclude devices that are suitable for or configured to perform additional tasks or steps.

Additionally, the use of "based on" is meant to be open and inclusive, as a process, step, calculation, or other action that is "based on" one or more stated conditions or values may in practice be based on additional conditions or beyond stated values.

As used herein, "about", "approximately" or "approximately" includes the stated value as well as the average within the acceptable deviation range of the specified value, wherein the acceptable deviation range is as determined by one of ordinary skill in the art. Determined taking into account the measurement in question and the errors associated with the measurement of a particular quantity (ie, limitations of the measurement system).

As used herein, "parallel", "perpendicular", and "equal" include the stated situation and the situation similar to the stated situation, the range of the similar situation is within the acceptable deviation range, wherein the The stated range of acceptable deviation is as determined by one of ordinary skill in the art taking into account the measurement in question and errors associated with measurement of the particular quantity (ie, limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range of approximate parallelism can be, for example, a deviation within 5°; Deviation within 5°. "Equal" includes absolute equality and approximate equality, where the difference between the two that may be equal is less than or equal to 5% of either within acceptable tolerances for approximate equality, for example.

FIG. 1 is a block diagram of an air source heat pump system according to some embodiments. As shown in FIG. 1 , the air source heat pump system includes an outdoor unit 101 , a water-side heat exchanger 102 , and an indoor terminal device 205 , and the water-side heat exchanger 102 is connected to the outdoor unit 101 and the indoor terminal device 205 . For example, the water-side heat exchanger 102 is connected to the refrigerant pipeline of the outdoor unit 101 through piping, and is connected to the indoor terminal equipment 205 through a water circulation pipeline. The present disclosure does not limit the number of indoor terminal devices 205 , which may be one or more. FIG. 1 shows three indoor terminal devices 205 .

In some embodiments, the outdoor unit 101 and the water-side heat exchanger 102 may adopt a separate design, or the water-side heat exchanger 102 may be integrated into the outdoor unit 101 .

Fig. 4 is a structural diagram of an outdoor unit and a water-side heat exchanger of an air source heat pump system according to some embodiments. As shown in FIG. 4 , the outdoor unit 101 includes a compressor 11 , a four-way valve 12 , an air-side heat exchanger 14 and an electronic expansion valve 17 . The compressor 11 includes an exhaust port 110 and an air return port 111. The exhaust port 110, the air return port 111, the water side heat exchanger 102 and the air side heat exchanger 14 of the compressor 11 respectively pass through the four ports of the four-way valve 12. Communication line connection. The electronic expansion valve 17 is connected with the air-side heat exchanger 14 and the water-side heat exchanger 102 through communication pipelines.

It can be understood that the air-side heat exchanger 14 refers to the heat exchange between the refrigerant and the air in the air-side heat exchanger 14, for example, the air-side heat exchanger 14 acts as a condenser, and the refrigerant releases heat to the air at this time; The side heat exchanger 14 acts as an evaporator, and at this time, the refrigerant absorbs the heat in the air. The water-side heat exchanger 102 refers to the heat exchange between the refrigerant and water in the water-side heat exchanger 102, for example, the water-side heat exchanger 102 acts as a condenser, and at this time the refrigerant releases heat to the water in the water-side heat exchanger 102 ; The water-side heat exchanger 102 acts as an evaporator, and the refrigerant absorbs the heat of the water in the water-side heat exchanger 102 at this time.

Compressor 11, condenser (such as water side heat exchanger 102 or air side heat exchanger 14), electronic expansion valve 17 and evaporator (such as air side heat exchanger 14 or water side heat exchanger 102) to implement the air source Refrigerant circulation in heat pump systems. The refrigerant cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the regulated side cycle.

The compressor 11 compresses the low-temperature and low-pressure gas-phase refrigerant and discharges the compressed high-temperature and high-pressure gas-phase refrigerant, and the high-temperature and high-pressure gas-phase refrigerant flows into the condenser. The condenser condenses the high-temperature and high-pressure gas-phase refrigerant into a high-pressure liquid-phase refrigerant, and the heat is released to the surrounding environment along with the condensation process. The electronic expansion valve 17 expands the high-pressure liquid-phase refrigerant into a low-pressure gas-liquid two-phase refrigerant. The evaporator absorbs heat from the surrounding environment and evaporates the low-pressure gas-liquid two-phase refrigerant to form a low-temperature and low-pressure gas-phase refrigerant, and returns the low-temperature and low-pressure gas-phase refrigerant to the compressor 11 .

The water side heat exchanger 102 and the air side heat exchanger 14 function as a condenser or an evaporator. While the water side heat exchanger 102 acts as a condenser, the air side heat exchanger 14 acts as an evaporator. While the water side heat exchanger 102 is used as an evaporator, the air side heat exchanger 14 is used as a condenser. When the water-side heat exchanger 102 is used as a condenser, the water-side heat exchanger 102 supplies hot water to the indoor terminal equipment 205 to realize indoor heating, and the air source heat pump system is used as a heater in heating mode. When the water-side heat exchanger 102 is used as an evaporator, the water-side heat exchanger 102 supplies cold water to the indoor terminal equipment 205 to realize indoor cooling, and the air source heat pump system is used as a cooler in cooling mode.

The water-side heat exchanger 102 includes a refrigerant side and a water side. The refrigerant side includes a first refrigerant port 1021 and a second refrigerant port 1022 , the first refrigerant port 1021 is connected to one port of the four-way valve 12 , and the second refrigerant port 1022 is connected to the electronic expansion valve 17 . The water side includes a heat pump water supply port OUT and a heat pump return port IN (as shown in FIG. 1 ), the heat pump water supply port OUT is connected to the water inlet side of the indoor terminal device 205, and the heat pump return port IN is connected to the indoor terminal device 205's return water side. .

The refrigerant side of the water-side heat exchanger 102 receives the refrigerant flowing out through the refrigerant pipeline of the outdoor unit 101, and after heat exchange by the water-side heat exchanger 102, cold and hot water flow out from the water supply port OUT of the heat pump, and the cold and hot water pass through the water circulation pipe The road flows into the indoor terminal device 205 to realize indoor cooling and heating. The water flowing out from the indoor terminal equipment 205 flows back to the water return port IN of the heat pump to realize cold and hot water circulation.

It can be understood that the side where the water-side heat exchanger 102 is connected to the outdoor unit 101 is the refrigerant side, and the side where the water-side heat exchanger 102 is connected to the indoor terminal equipment 205 is the water side.

FIG. 2 is a structural diagram of a relay reversing device of an air source heat pump system according to some embodiments, showing a through flow direction. Referring to FIG. 2 , the air source heat pump system further includes a relay reversing device 201 and a buffer water tank 202 . The relay reversing device 201 includes a second water inlet A', a third water outlet D' communicating with the second water inlet A', a second water return port C', and a fourth water outlet communicating with the second water return port C'. Shuikou B'. The second water inlet A' communicates with the heat pump water supply port OUT of the water-side heat exchanger 102 , and the third water outlet D' communicates with the water inlet side of the indoor terminal equipment 205 . The fourth water outlet B' communicates with the heat pump return water port IN of the water-side heat exchanger 102 , and the second water return port C' communicates with the return water side of the indoor terminal equipment 205 . The buffer water tank 202 includes a main body and a first water inlet A, a first water outlet B, a first water return port C and a second water outlet D connected to the main body.

As shown in FIGS. 1 and 2 , the relay reversing device 201 further includes a first straight branch 210 , a first bypass branch 220 , a second straight branch 230 and a second bypass branch 240 . The first straight branch 210 directly communicates with the second water inlet A' and the third water outlet D', and the first bypass branch 220 communicates with the second water inlet A' and the third water outlet D' through the buffer tank 202 . The first bypass branch 220 includes a first bypass branch 221 and a second bypass branch 222, and the first bypass branch 221 communicates with the second water inlet A' of the relay reversing device 201 and the first water inlet A' of the buffer tank 202. Water port A, the second bypass branch 222 connects the first water outlet B of the buffer water tank 202 and the third water outlet D' of the relay reversing device 201, so that the second water inlet A' and the third water outlet D' pass through The first bypass branch 220 communicates with the buffer tank 202 .

The second straight branch 230 directly communicates with the second water return port C′ and the fourth water outlet B′, and the second bypass branch 240 communicates with the second water return port C′ and the fourth water outlet B′ through the buffer water tank 202 . The second bypass branch 240 includes a third bypass branch 241 and a fourth bypass branch 242. The third bypass branch 241 communicates with the second water return port C' of the relay reversing device 201 and the first return port of the buffer water tank 202. The water port C and the fourth bypass branch 242 are connected to the second water outlet D of the buffer tank 202 and the fourth water outlet B' of the relay reversing device 201, so that the second water return port C' and the fourth water outlet B' pass through The second bypass branch 240 communicates with the buffer tank 202 .

Fig. 3 is a structural diagram of a relay reversing device of an air source heat pump system according to some embodiments, showing a bypass flow direction. When the water flows from the water-side heat exchanger 102 to the indoor terminal equipment 205 , it passes through the first straight branch 210 or the first bypass branch 220 .

The first straight branch 210 is switched and communicated with the first bypass branch 220 . That is, when the first straight branch 210 is connected to the second water inlet A' and the third water outlet D', the first bypass branch 220 is not connected to the second water inlet A' and the third water outlet D', and the water The water flow output from the heat pump water inlet OUT of the side heat exchanger 102 passes through the second water inlet A', the first straight branch 210 and the third water outlet D' in sequence. As shown in Figure 2 the solid arrows.

When the first straight branch 210 is not connected to the second water inlet A' and the third water outlet D', the first bypass branch 220 is connected to the second water inlet A' and the third water outlet D', changing from the water side The water flow output from the heat pump water supply port OUT of the heater 102 passes through the second water inlet A', the first bypass branch 221, the buffer water tank 202, the second bypass branch 222 and the third water outlet D' in sequence. The water tank 202 exchanges heat, and the flow of water flows as shown by the solid arrows in FIG. 3 . When the water flows back from the indoor terminal equipment 205 to the water-side heat exchanger 102 , it passes through the second direct branch 230 or the second bypass branch 240 .

The second through branch 230 is switched and communicated with the second bypass branch 240 . That is, when the second straight branch 230 is connected to the second water return port C' and the fourth water outlet B', the second bypass branch 240 is not connected to the second water return port C' and the fourth water outlet B'. The water flowing back from the equipment 205 passes through the second water return port C', the second straight-through branch 230 and the fourth water outlet B' in sequence. At this time, the water flow does not exchange heat through the buffer tank 202, and the water flow direction is shown by the dotted arrow in Figure 2 .

When the second straight branch 230 is not connected to the second water return port C' and the fourth water outlet B', the second bypass branch 240 is connected to the second water return port C' and the fourth water outlet B'. The water flowing back from the equipment 205 to the water-side heat exchanger 102 passes through the second water return port C', the third bypass branch 241, the buffer water tank 202, the fourth bypass branch 242 and the fourth water outlet B' in sequence. The buffer water tank 202 exchanges heat, as shown by the dotted arrow in FIG. 3 .

In order to realize the connection of the above-mentioned different passages according to requirements, in some embodiments of the present disclosure, as shown in Figure 1 to Figure 3, the relay reversing device 201 includes a first electric three-way valve 2011, a second electric three-way valve Three electric three-way valves 2013 and a fourth electric three-way valve 2014. Both the first electric three-way valve 2011 and the fourth electric three-way valve 2014 include three ports, wherein the first port P1 is opposite to the third port P3, and the first port P1 is a water inlet, and the third port P3 is a water outlet ; The second port P2 is vertically arranged with the first port P1 and the third port P3 respectively, and the second port is the water outlet of P2. Both the second electric three-way valve 2012 and the third electric three-way valve 2013 include three ports, wherein the first port P1 is opposite to the third port P3, and the first port P1 is a water inlet, and the third port P3 is a water outlet ; The second port P2 is vertically arranged with the first port P1 and the third port P3 respectively, and the second port P2 is a water inlet.

The first port P1 of the first electric three-way valve 2011 communicates with the second water inlet A' of the relay reversing device 201, and the second port P2 of the first electric three-way valve 2011 communicates with the first water inlet A of the buffer tank 202 The third port P3 of the first electric three-way valve 2011 communicates with the first port P1 of the second electric three-way valve 2012 . The second port P2 of the second electric three-way valve 2012 communicates with the first water outlet B of the buffer tank 202, and the third port P3 of the second electric three-way valve 2012 communicates with the third water outlet D'.

The first port P1 controlling the first electric three-way valve 2011 communicates with the third port P3 , and the first port P1 of the second electric three-way valve 2012 communicates with the third port P3 to form a first straight branch 210 . The first port P1 controlling the first electric three-way valve 2011 communicates with the second port P2 to form a first bypass branch 221, and the second port P2 controlling the second electric three-way valve 2012 communicates with the third port P3 to form a first bypass branch 221. Two bypass branches 222 .

The first port P1 of the fourth electric three-way valve 2014 communicates with the second return port C', the second port P2 of the fourth electric three-way valve 2014 communicates with the first return port C of the buffer tank 202, and the fourth electric three-way The third port P3 of the valve 2014 communicates with the first port P1 of the third electric three-way valve 2013 . The second port P2 of the third electric three-way valve 2013 communicates with the second water outlet D of the buffer tank 202 , and the third port P3 of the third electric three-way valve 2013 communicates with the fourth water outlet B′.

When the first port P1 of the third electric three-way valve 2013 is connected to the third port P3, and the first port P1 of the fourth electric three-way valve 2014 is connected to the third port P3, a second direct branch 230 is formed. The second port P2 controlling the third electric three-way valve 2013 communicates with the third port P3 to form a fourth bypass branch 242, and the first port P1 controlling the fourth electric three-way valve 2014 communicates with the second port P2 to form a fourth bypass branch 242. Three bypass branches 241 .

It should be noted that, in some embodiments of the present disclosure, one of the first direct branch 210 and the first bypass branch 220 is connected, and one of the second direct branch 230 and the second bypass branch 240 is selected. connected. In addition, when controlling the connection of the first through branch 210, the connection of the second through branch 230 must also be controlled. At this time, when the air source heat pump system is running, the heat pump water inlet OUT of the water side heat exchanger 102 flows out and enters the room. Neither the water from the terminal equipment 205 nor the water returned from the indoor terminal equipment 205 to the heat pump return port IN of the water side heat exchanger 102 passes through the buffer tank 202, reducing the pressure of the buffer tank 202; , it is necessary to control the connection of the second bypass branch 240. At this time, when the air source heat pump system is running, the water flowing out of the heat pump water supply port OUT of the water side heat exchanger 102 and entering the indoor terminal equipment 205 and the water supplied by the indoor terminal equipment 205 The water that flows back to the water return port IN of the heat pump of the water side heat exchanger 102 all passes through the buffer water tank 202 , and the cold storage or heat storage capacity of the buffer water tank 202 can be utilized.

The water-side heat exchanger 102 controls the relay reversing device 201 so that the water output from the heat pump water supply port OUT of the water-side heat exchanger 102 passes or does not pass through the buffer water tank 202 for heat exchange. For example, the water-side heat exchanger 102 has an electric control board, and the electric control board of the water-side heat exchanger 102 controls the relay reversing device 201, so that the water output from the heat pump water supply port OUT of the water-side heat exchanger 102 passes through or No heat exchange through the buffer tank 202 .

In order to improve the flow capacity of water in the relay reversing device 201, as shown in Figures 1 to 3, the relay reversing device 201 also includes a first booster pump 2015 and a second booster pump 2016, the first booster pump 2015 is located on the communication pipeline between the second water inlet A' and the first port P1 of the first electric three-way valve 2011, and the second booster pump 2016 is located between the third port P3 of the second electric three-way valve 2012 and the third On the communication pipeline between the water outlets D′, the first booster pump 2015 and the second booster pump 2016 are configured to change the pressure of the water flow in the communication pipeline to change the speed of the water flow.

In some embodiments of the present disclosure, the air source heat pump system includes a plurality of indoor terminal devices 205, the multiple indoor terminal devices 205 include a domestic hot water tank 2051, and two space heating/cooling devices 2050, and the two A space heating/refrigeration device 2050 is an air disk 2052 and a floor heating 2053 as an example for illustration.

The air source heat pump system also includes a fifth electric three-way valve 203 and a sixth electric three-way valve 204. The fifth electric three-way valve 203 and the sixth electric three-way valve 204 are configured to realize the domestic hot water tank 2051, the wind disk 2052 And the switch of floor heating 2053. Both the fifth electric three-way valve 203 and the sixth electric three-way valve 204 include three ports, wherein the first port P1 is opposite to the third port P3, and the first port P1 is a water inlet, and the third port P3 is a water outlet ; The second port P2 is vertically arranged with the first port P1 and the third port P3 respectively, and the second port P2 is a water outlet.

The first port P1 of the fifth electric three-way valve 203 communicates with the third water outlet D', the second port P2 of the fifth electric three-way valve 203 communicates with the first port P1 of the sixth electric three-way valve 204, and the fifth The third port P3 of the electric three-way valve 203 communicates with the water inlet side of the wind disc 2052 . The second port P2 of the sixth electric three-way valve 204 communicates with the water inlet side of the floor heater 2053 , and the third port P3 of the sixth electric three-way valve 204 communicates with the water inlet side of the domestic hot water tank 2051 .

In this way, through the fifth electric three-way valve 203 and the sixth electric three-way valve 204, the switching communication between the relay reversing device 201 and the domestic hot water tank 2051, the wind disk 2052 and the floor heating 2053 is realized. It should be noted that, Switching connection in the present disclosure refers to that the relay switching device 201 only connects to one indoor terminal device 205 at the same time.

When another space heating/cooling device 2050 is added, an electric three-way valve will be added correspondingly, and the adjacent ports of each electric three-way valve are connected.

It can be understood that the domestic hot water tank 2051 and the space heating/cooling device 2050 belong to different types of indoor terminal devices 205 . The domestic hot water tank 2051 is only in the heating mode during operation; while the space heating/cooling device 2050 can be in the heating mode or the cooling mode during operation.

The space heating/cooling device 2050 is configured to heat or cool an indoor space. When the water-side heat exchanger 102 is heating or cooling, the heating or cooling water is passed into the space heating/cooling equipment 2050 to realize heating or cooling to the indoor space.

It should be noted that when there is switching between the domestic hot water tank 2051 and the space heating/cooling equipment 2050, or when the space heating/cooling equipment 2050 switches between cooling and heating, it is necessary to control the relay reversing device 201 The water output from the heat pump water supply port OUT of the water side heat exchanger 102 passes through or does not pass through the buffer water tank 202 for heat exchange.

In some embodiments of the present disclosure, the multiple indoor terminal devices 205 include a domestic hot water tank 2051 and at least one space heating/cooling device 2050 . Exemplarily, the multiple indoor terminal devices 205 include a domestic hot water tank 2051 and a space heating and cooling device 2050, the domestic hot water tank 2051 and a space heating/cooling device 2050 are switched to operate, and the space heating/cooling device 2050 cools and heating automatic switching operation.

The buffer water tank 202 can be used as a cold storage device or heat storage device, and is configured to play the roles of energy storage buffer and hydraulic pressure partial pressure in the air source heat pump system, which can ensure the temperature stability during space heating/cooling and improve user comfort.

When in winter, the buffer water tank 202 is used as heat storage equipment. When the space heating/refrigerating equipment 2050 is heating and the domestic hot water tank 2051 is heating, the water side heat exchanger 102 collects the water temperature in the indoor terminal device 205 in real time, and determines whether the water temperature in the indoor terminal device 205 and the target temperature are Within the preset temperature range, the relay reversing device 201 is controlled so that the first straight branch 210 or the first bypass branch 220 is connected, so that the water output from the heat pump water supply port OUT of the water side heat exchanger 102 passes through or No heat exchange through the buffer tank 202 .

When switching from space heating/cooling equipment 2050 heating to domestic hot water tank 2051 heating, the water side heat exchanger 102 determines that the water temperature and target temperature of the domestic hot water tank 2051 are within the preset temperature range (for example -5°C to 5°C), control the relay reversing device 201 to make the first bypass branch 220 communicate with the buffer water tank 202, and the domestic hot water tank 2051 can use the heat in the buffer water tank 202 at this time. When the water side heat exchanger 102 determines that the water temperature and the target temperature of the domestic hot water tank 2051 are not within the preset temperature range, it controls the relay reversing device 201 to make the first straight branch 210 communicate, and the water side heat exchanger 102 The water output from the water supply port OUT of the heat pump does not pass through the buffer water tank 202, and the heating capacity of the water side heat exchanger 102 is fully utilized, so that the heating effect of the domestic hot water tank 2051 is faster and the pressure of the buffer water tank 202 is reduced.

When switching from domestic hot water tank 2051 heating to space heating/cooling equipment 2050 heating operation, the water side heat exchanger 102 controls the relay reversing device 201 to make the first bypass branch 220 communicate with the buffer water tank 202 At this time, the water output from the heat pump water supply port OUT of the water side heat exchanger 102 passes through the buffer water tank 202, and utilizes the heat in the buffer water tank 202 to ensure stable temperature during space heating and improve user comfort.

In summer, for example, the buffer water tank 202 serves as a cold storage device. When switching from cooling in the space heating/refrigerating equipment 2050 to heating in the domestic hot water tank 2051, the water-side heat exchanger 102 controls the relay reversing device 201 to make the first straight branch 210 communicate, and the water-side heat exchanger The water output from the heat pump water supply port OUT of 102 does not pass through the buffer water tank 202, so as to prevent the water in the buffer water tank 202 from changing from cold water to hot water, reduce the load of the buffer water tank 202, and avoid energy waste at the same time.

When switching from heating in the domestic hot water tank 2051 to cooling in the space heating/cooling equipment 2050, the water-side heat exchanger 102 controls the relay reversing device 201 to make the first bypass branch 220 communicate with the buffer water tank 202, and the water The water output from the heat pump water supply port OUT of the side heat exchanger 102 passes through the buffer water tank 202 to utilize the cold storage capacity in the buffer water tank 202 .

Exemplarily, the buffer water tank 202 is used as heat storage equipment. When switching from heating in the domestic hot water tank 2051 to cooling in the space heating/cooling equipment 2050, the water-side heat exchanger 102 controls the relay reversing device 201 to make the first straight branch 210 communicate, and the water-side heat exchanger The water output from the heat pump water supply port OUT of 102 does not pass through the buffer water tank 202, so as to prevent the water in the buffer water tank 202 from changing from hot water to cold water, reduce the load of the buffer water tank 202, and avoid energy waste at the same time.

When switching from space heating/cooling equipment 2050 cooling to domestic hot water tank 2051 heating, the water side heat exchanger 102 determines that the water temperature and target temperature of the domestic hot water tank 2051 are within the preset temperature range (for example -5°C to 5°C). °C), control the relay reversing device 201 so that the first bypass branch 220 communicates with the buffer water tank 202, and the domestic hot water tank 2051 can use the heat in the buffer water tank 202 at this time. When the water-side heat exchanger 102 determines that the water temperature and target temperature of the domestic hot water tank 2051 are not within the preset temperature range, it controls the relay reversing device 201 to make the first straight branch 210 communicate, and the water-side heat exchanger 102 The water output from the water supply port OUT of the heat pump does not pass through the buffer water tank 202 , and the heating capacity of the water side heat exchanger 102 is fully utilized to make the heating effect of the domestic hot water tank 2051 faster and reduce the pressure of the buffer water tank 202 .

In the transitional season (spring and autumn), the space heating/cooling device 2050 enters the automatic operation mode. The automatic operation mode means that the space heating/cooling device 2050 automatically switches to the cooling mode when the outdoor temperature reaches the preset temperature upper limit. When the outdoor temperature is lower than the lower limit of the preset temperature, the space heating/cooling device 2050 automatically switches the heating mode. In this way, the outdoor unit 101 controls the space heating/cooling device 2050 to automatically switch between space cooling and heating based on the detected outdoor temperature. The water-side heat exchanger 102 controls the relay reversing device 201 so that the water output from the heat pump water supply port OUT of the water-side heat exchanger 102 passes or does not pass through the buffer water tank 202 for heat exchange.

Exemplarily, the outdoor unit 101 further includes an outdoor unit electric control board 13, which collects the outdoor ambient temperature, and determines whether the space heating/cooling device 2050 is space cooling or space heating based on the outdoor ambient temperature. When the water-side heat exchanger 102 is integrated into the outdoor unit 101, the electric control board in the water-side heat exchanger 102 can be integrated into the outdoor unit electric control board 13, and the relay can be controlled by the outdoor unit electric control board 13 The reversing device 201 is used to make the water output from the heat pump water supply port OUT of the water side heat exchanger 102 pass or not pass through the buffer water tank 202 for heat exchange.

In the automatic operation mode, the working process of the space heating/cooling equipment 2050 switching between the cooling mode and the heating mode is as follows:

Exemplarily, the buffer water tank 202 is used as heat storage equipment. When the space heating/cooling equipment 2050 switches from the cooling mode to the heating mode, the water-side heat exchanger 102 controls the relay reversing device 201 to make the first bypass branch 220 communicate with the buffer water tank 202, and the water-side heat exchange The water output from the heat pump water supply port OUT of the device 102 passes through the buffer water tank 202 to utilize the heat in the buffer water tank 202 .

When the space heating/cooling equipment 2050 switches from the heating mode to the cooling mode, the water-side heat exchanger 102 controls the relay reversing device 201 to make the first straight branch 210 communicate, and the heat pump of the water-side heat exchanger 102 The water output from the water supply port OUT does not pass through the buffer water tank 202 , and the cooling capacity of the water-side heat exchanger 102 is fully utilized to reduce the pressure of the buffer water tank 202 .

Exemplarily, the buffer water tank 202 serves as a cold storage device. When the space heating/cooling equipment 2050 switches from the heating mode to the cooling mode, the water-side heat exchanger 102 controls the relay reversing device 201 to make the first bypass branch 220 communicate with the buffer water tank 202, and the water-side heat exchange The water output from the heat pump water supply port OUT of the heat pump 102 passes through the buffer water tank 202 .

When the space heating/cooling equipment 2050 switches from the cooling mode to the heating mode, the water-side heat exchanger 102 controls the relay reversing device 201 to make the first straight branch 210 communicate, and the heat pump of the water-side heat exchanger 102 The water output from the water supply port OUT does not pass through the buffer tank 202 .

In the automatic operation mode of the space heating/cooling equipment 2050, when the outdoor unit 101 determines that the space heating/cooling equipment 2050 needs to be heated, the space heating/cooling equipment 2050 and the domestic hot water tank 2051 switch between heating operations at this time The working process refers to the working process of the space heating/refrigerating equipment 2050 heating and the domestic hot water tank 2051 heating switching operation in winter, and will not be repeated here.

In the automatic operation mode of the space heating/cooling equipment 2050, when the outdoor unit 101 determines that the space heating/cooling equipment 2050 needs to be cooled, the space heating/cooling equipment 2050 and the domestic hot water tank 2051 switch between heating operations at this time The working process refers to the working process of the space heating/cooling equipment 2050 cooling and the domestic hot water tank 2051 heating switching operation in summer, and will not be repeated here.

As shown in FIG. 1 , the air source heat pump system further includes an auxiliary heat source 103 , and the auxiliary heat source 103 communicates with the buffer water tank 202 through a communication pipeline. In some embodiments, the auxiliary heat source 103 may be a gas wall-hung boiler, a solar water heater, or a gas water heater, etc., and the auxiliary heat source 103 is configured to provide heat for the buffer water tank 202 . When the auxiliary heat source 103 is a solar water heater, the water in the buffer water tank 202 can be heated if the solar heating temperature condition is satisfied, and the energy is effectively utilized.

In some embodiments of the present disclosure, the relay reversing device 201 can be controlled by the electric control board of the water side heat exchanger 102, and can also be controlled by an independent control circuit in the relay reversing device 201. When the outdoor unit 101 fails , the auxiliary heat source 103 communicated with the buffer water tank 202 can provide thermal energy for the indoor terminal equipment 205 . It should be noted that the auxiliary heat source 103 can only work when the buffer water tank 202 is only used as a heat storage device, and the start and stop of the auxiliary heat source 103 can be controlled by the electric control board of the water side heat exchanger 102 .

For example, when the space heating/cooling equipment 2050 is heating and the domestic hot water tank 2051 is switching, the heating target temperature in the buffer water tank 202 varies according to the indoor terminal equipment 205. At this time, the auxiliary heat source 103 and the water The side heat exchangers 102 can collectively provide heat for the water in the buffer tank 202 .

The buffer water tank 202 is a heat storage device. When switching from heating in the domestic hot water tank 2051 to cooling in the space heating/cooling device 2050, the water-side heat exchanger 102 controls the relay reversing device 201 so that the first straight branch 210 is connected, the water output from the heat pump water supply port OUT of the water side heat exchanger 102 does not pass through the buffer water tank 202, the heat provided by the auxiliary heat source 103 is effectively used, and the cooling water is prevented from flowing into the buffer water tank 202, thereby reducing the load of the buffer water tank 202.

The buffer water tank 202 is heat storage equipment. When switching from cooling in the space heating/refrigerating equipment 2050 to heating in the domestic hot water tank 2051, the water-side heat exchanger 102 controls the relay reversing device 201 so that the first bypass branch 220 communicates with the buffer water tank 202 , and the water output from the heat pump water supply port OUT of the water-side heat exchanger 102 passes through the buffer water tank 202 to utilize the heat provided by the auxiliary heat source 103 .

For the air source heat pump system with the auxiliary heat source 103, when the outdoor unit 101 or the water side heat exchanger 102 fails, the cooling mode of the air source heat pump system cannot be performed normally, but at this time the heating mode of the air source heat pump system The emergency operation mode can be entered, that is, the auxiliary heat source 103 can be used to heat the water in the buffer water tank 202 to meet the heating demand of the space heating/cooling equipment 2050 .

When there is a domestic hot water tank 2051 and two or more space heating/refrigerating devices 2050 are switching, the working process of switching is similar to the above.

In other embodiments of the present disclosure, the multiple indoor terminal devices 205 include at least two space heating/cooling devices 2050 . Exemplarily, the plurality of indoor terminal devices 205 include two space heating/cooling devices 2050, which are floor heating 2053 and air disk 2052, and floor heating 2053 and air disk 2052 operate in a switchable manner.

For example, when it is winter or a transitional season, and the buffer water tank 202 is used as a heat storage device. The working process of the heating switch operation of the wind disk 2052 and the heating of the floor heating 2053 is as follows: the water side heat exchanger 102 controls the relay reversing device 201, so that the first bypass branch 220 communicates with the buffer water tank 202, and the water side reversing The water output from the heat pump water supply port OUT of the heater 102 passes through the buffer water tank 202 and utilizes the heat in the buffer water tank 202 to ensure temperature stability during space heating and improve user comfort.

In summer or in transitional seasons, and the buffer water tank is used as cold storage equipment, the working process of switching operation of the cooling of the air tray 2052 and the cooling of the floor heating 2053 is as follows: the water side heat exchanger 102 controls the relay reversing device 201 to make the first bypass The branch path 220 is connected with the buffer water tank 202, and the water output from the heat pump water supply port OUT of the water side heat exchanger 102 passes through the buffer water tank 202, and the cold storage capacity in the buffer water tank 202 is used to keep the water temperature in the system at a low level for a long time, improving user comfort.

When there are multiple space heating/cooling devices 2050, the working process of switching them is similar to the above.

In the present disclosure, by setting the relay reversing device 201 and the buffer water tank 202, it can meet the different needs of the indoor terminal equipment 205, and can effectively reduce the pressure of the buffer water tank 202, reduce energy loss and effectively improve user experience.

Fig. 5 is a schematic diagram of the refrigerant circulation of the air source heat pump system during cooling operation according to some embodiments, and the solid arrows in Fig. 5 indicate the refrigerant flow direction of the air source heat pump system during the refrigeration cycle. As shown in Figure 5, the compressor 11 compresses the gas-phase refrigerant in a low-temperature and low-pressure state and discharges the compressed high-temperature and high-pressure gas-phase refrigerant through the exhaust port 110, and the high-temperature and high-pressure gas-phase refrigerant flows into the air used as the condenser through the four-way valve 12 The side heat exchanger 14 and the air side heat exchanger 14 condense the compressed high-temperature and high-pressure gas-phase refrigerant into a high-pressure liquid-phase refrigerant, and release the heat generated during the condensation process to the surrounding environment.

The high-pressure liquid-phase refrigerant flowing out of the air-side heat exchanger 14 enters the electronic expansion valve 17, expands into a low-pressure gas-liquid two-phase refrigerant through the electronic expansion valve 17, and then enters the water-side heat exchanger as an evaporator 102. The water-side heat exchanger 102 evaporates the low-pressure gas-liquid two-phase refrigerant expanded in the electronic expansion valve 17, and the low-pressure gas-liquid two-phase refrigerant absorbs the heat in the water circulating in the water-side heat exchanger 102 and evaporates to become The low-temperature and low-pressure gas-phase refrigerant, and finally the low-temperature and low-pressure gas-phase refrigerant returns to the compressor 11 through the gas return port 111 .

Fig. 6 is a schematic diagram of the refrigerant cycle during the heating operation of the air source heat pump system according to some embodiments. The dotted arrow in Fig. 6 indicates the refrigerant flow direction of the air source heat pump system during the heating cycle, and the compressor 11 is compressed at low temperature and low pressure The gas-phase refrigerant in the state will discharge the compressed high-temperature and high-pressure gas-phase refrigerant through the exhaust port 110, and the high-temperature and high-pressure gas-phase refrigerant will flow into the water-side heat exchanger 102 as a condenser through the four-way valve 12, and the water-side heat exchanger 102 will The compressed high-temperature and high-pressure gas-phase refrigerant is condensed into a high-pressure liquid-phase refrigerant, and the heat generated during the condensation process is released into the water circulating in the water-side heat exchanger 102 .

The high-pressure liquid-phase refrigerant coming out of the water-side heat exchanger 102 enters the electronic expansion valve 17, expands into a low-pressure gas-liquid two-phase refrigerant through the electronic expansion valve 17, and then enters the air-side heat exchanger 14 as an evaporator. . The air-side heat exchanger 14 evaporates the low-pressure gas-liquid two-phase refrigerant expanded in the electronic expansion valve 17, and the low-pressure gas-liquid two-phase refrigerant absorbs the heat in the surrounding environment and evaporates into a low-temperature and low-pressure gas-phase refrigerant. The gas-phase refrigerant in a low-temperature and low-pressure state returns to the compressor 11 through the gas return port 111 .

After the product is shut down, due to the pressure difference between the two ends of the compressor, the refrigerant flows from the high-pressure side to the low-pressure side. When the product is turned on again, the refrigerant on the low-pressure side enters the compressor 11 for compression, and the gas-phase refrigerant discharged after being compressed by the compressor 11 is at high pressure and high temperature. Overheated state. Due to the fast flow rate and high temperature of the gas-phase refrigerant when it is discharged, part of the compressor oil forms oil vapor and oil droplet particles due to the high temperature and is discharged together with the gas-phase refrigerant. And the higher the temperature of the gas-phase refrigerant and the faster the flow rate, the more compressor oil will be discharged. Therefore, a large amount of refrigerant on the low-pressure side is recompressed and discharged, which will take away a large amount of compressor oil from the compressor, resulting in a lack of oil in the compressor.

In the related art, an oil separator is installed between the exhaust port 110 of the compressor 11 and the four-way valve 12, and the high-temperature and high-pressure gas-phase refrigerant and part of the compressor oil discharged from the compressor 11 enter the oil separator, and the oil separator will The gas-phase refrigerant is separated from part of the compressor oil, the high-temperature and high-pressure gas-phase refrigerant enters the condenser for condensation, and part of the compressor oil returns to the compressor 11 through the oil separator. But adding an oil separator adds cost, so it's usually not used.

In order to solve the above problems, in some embodiments of the present disclosure, as shown in FIG. Between, and one-way communication from the compressor 11 to the four-way valve 12.

Fig. 7 is a sequence diagram of control principles of an air source heat pump system according to some embodiments, Fig. 8 is a sequence diagram of control principles of another air source heat pump system according to some embodiments, and Fig. 13 is a sequence diagram of control principles of an air source heat pump system according to some embodiments A block diagram of an air source heat pump system. As shown in FIG. 4 , the air source heat pump system also includes a fan 18 , a high pressure switch 19 and a low pressure switch 20 . The fan 18 is provided on one side of the air-side heat exchanger 14 . The high pressure switch 19 is disposed between the exhaust port 110 of the compressor 11 and the one-way valve 15, and is configured to be disconnected when the pressure in the air source heat pump system is higher than a preset pressure upper limit. The low pressure switch 20 is arranged between the air return port 111 of the compressor 11 and the four-way valve 12, and is configured to be disconnected when the pressure in the air source heat pump system is lower than a preset lower pressure limit.

As shown in Figure 8 and Figure 13, the outdoor unit electric control board 13 is connected with the electronic expansion valve 17, the compressor 11 and the fan 18, and is configured to close the electronic expansion valve 17 and control the compressor when receiving a shutdown signal 11 and fan 18 remain open; when it is determined that the shutdown condition is met, the compressor 11 and fan 18 are turned off.

It can be understood that when the air source heat pump system does not include the fan 18, as shown in Figure 7 and Figure 13, the outdoor unit electric control board 13 is connected with the electronic expansion valve 17 and the compressor 11, and is configured to: signal, close the electronic expansion valve 17, and control the compressor 11 to keep on; when it is determined that the shutdown condition is met, close the compressor 11.

It should be noted that the shutdown conditions include any of the following conditions: the suction pressure of the compressor 11 reaches the lower limit of the suction pressure, the discharge pressure of the compressor 11 reaches the upper limit of the discharge pressure, the When the exhaust temperature reaches the upper limit of the exhaust temperature, the high pressure switch 19 is turned off, the low pressure switch 20 is turned off, and the compressor 11 is kept on for a duration that reaches the upper limit of time.

When the suction pressure of the compressor 11 reaches the lower limit of the suction pressure or the discharge pressure of the compressor 11 reaches the upper limit of the discharge pressure, the electric control board 13 of the outdoor unit controls the compressor 11 to turn off, which can realize the suction pressure and discharge pressure. Gas pressure protection to ensure the safety of system operating pressure.

When the duration that the compressor 11 remains on reaches the time limit, the outdoor unit electric control board 13 controls the compressor 11 to be turned off, preventing the system from being unable to stop for a long time after receiving the stop signal.

In some embodiments of the present disclosure, after the electric control panel 13 of the outdoor unit receives the shutdown signal, the electronic expansion valve 17 is closed and the compressor 11 is controlled to keep running. At this time, the compressor 11 can continue to discharge the refrigerant on the low-pressure side to the high-pressure side. And because the electronic expansion valve 17 is closed, the high-pressure side refrigerant cannot flow to the low-pressure side through the communication pipeline. After the above process lasts for a period of time, the outdoor unit electric control board 13 turns off the compressor 11 after determining that the shutdown condition is met. Due to the existence of the one-way valve 15, the refrigerant on the high-pressure side cannot flow to the low-pressure side through the compressor 11. At this time, there is always a pressure difference between the high-pressure side and the low-pressure side, so that the refrigerant is stored on the high-pressure side. After the compressor 11 starts up again, due to the small amount of refrigerant on the low-pressure side, a large amount of refrigerant will not enter the compressor 11 in a short time, and thus will not consume a large amount of compressor oil in the compressor 11, thus avoiding the problem of compressor 11 lacking oil . Along with the circulation of the refrigerant, the refrigerant on the high-pressure side flows back to the low-pressure side through the electronic expansion valve 17 opened again, and then enters the compressor 11 to form a dynamic balance of the refrigerant.

In some embodiments of the present disclosure, the electric control board 13 of the outdoor unit is further configured to control the compressor 11 to run at a fixed frequency according to the set frequency after receiving the shutdown signal. The set frequency at least satisfies that the pressure difference between the discharge port 110 and the return port 111 of the compressor 11 is not less than the pressure difference threshold.

In some embodiments of the present disclosure, the set frequency ranges from 30 Hz to 60 Hz, and within the set frequency range, the high pressure side and the low pressure side of the compressor 11 maintain a proper pressure difference.

In some embodiments of the present disclosure, the electric control board 13 of the outdoor unit controls the speed at which the fan 18 is turned on to be kept at a relatively high speed, so as to improve heat exchange efficiency.

In some embodiments of the present disclosure, the air source heat pump system includes two operating modes, which are normal mode and silent mode. high speed. The silent mode here refers to that compared with the normal mode, the fan 18 maintains a relatively low rotational speed during normal operation. The speed of the fan 18 in the silent mode is lower than that of the fan 18 in the normal mode, and the noise generated by the fan 18 is reduced by reducing the speed of the fan 18 to realize low-noise operation. Fan 18 has corresponding stalls and each stall is set independently under normal mode and silent mode.

In silent mode, the gears of the fan 18 include a first gear and a second gear, and the wind speed of the first gear is greater than the wind speed of the second gear. In the normal mode, the gears of the fan 18 include a third gear and a fourth gear, and the wind speed of the third gear is greater than the wind speed of the fourth gear. It should be noted that the silent mode and the normal mode are not limited to the above two gears, and more gears can be set to further refine the control range, and the outdoor unit electric control board 13 controls the fan 18 in different modes according to Run in different gears.

In some embodiments of the present disclosure, for an air source heat pump system that does not include a silent mode, the electric control board 13 of the outdoor unit controls the operation of the fan 18 according to the control logic of the normal mode.

For air source heat pump systems using refrigerants such as R32, the system refrigerant charge usually requires a minimum room area. The smaller the refrigerant charge in the system, the easier it is to meet the room area requirements for on-site installation. Therefore, for this type of air source heat pump products, the liquid receiver is often not used in order to reduce the refrigerant charge in the system during system design. Due to the large difference in internal volume between the water-side heat exchanger 102 and the air-side heat exchanger 14, the optimal amount of refrigerant required by the air-source heat pump system during cooling and heating is inconsistent. When the liquid receiver is not used, the air-source heat pump system The amount of refrigerant charged in the refrigerator cannot be balanced during cooling and heating.

In the related art, the air source heat pump system adopts the water-side heat exchanger 102 and the air-side heat exchanger 14 with the same internal volume, but the selection requirements for the water-side heat exchanger 102 and the air-side heat exchanger 14 are relatively high. And when the water-side heat exchanger 102 and the air-side heat exchanger 14 with the same internal volume cannot be selected, the problem that the amount of refrigerant charged in the air source heat pump system cannot be kept in balance during cooling and heating cannot be avoided.

Fig. 9 is a structural diagram of an auxiliary liquid storage pipe section in an embodiment of an air source heat pump system, as shown in Fig. 4 and Fig. 9 , in some embodiments of the present disclosure, in order to solve the above problems, the air source heat pump system further includes The auxiliary liquid storage pipe section 16, the auxiliary liquid storage pipe section 16 is a cylinder, arranged along the vertical direction and located between the water side heat exchanger 102 and the air side heat exchanger 14, configured to assist the water side heat exchanger 102 to store refrigerant . The auxiliary liquid storage pipe section 16 includes a top port 161 and a bottom port 162. The top port 161 is connected to the air side heat exchanger 14 through a communication line, and the bottom port 162 is connected to the water side heat exchanger 102 through a communication line.

As shown in Figure 6 and Figure 9, when the air source heat pump system is in heating operation, referring to the arrow shown in dotted line in Figure 9, the high-pressure liquid-phase refrigerant flowing out from the water-side heat exchanger 102 enters the auxiliary The reservoir tube section 16, and flows out from the top port 161. The high-pressure gas-liquid two-phase refrigerant flowing out of the water-side heat exchanger 102 needs to fully store the auxiliary liquid storage pipe section 16 before entering the electronic expansion valve 17. At this time, the auxiliary liquid storage pipe section 16 is configured to share the power of the condenser. The amount of liquid refrigerant that should be stored in the water-side heat exchanger 102, at this time, more refrigerant is circulated to the water-side heat exchanger 102, so that the heating operation mode can operate better.

As shown in Figure 5 and Figure 9, when the air source heat pump system is in cooling operation, referring to the arrow shown by the solid line in Figure 9, the low-pressure gas-liquid two-phase refrigerant flowing out from the electronic expansion valve 17 enters from the top port 161 The auxiliary liquid storage pipe section 16, and flows out from the bottom port 162, and the form of up-in and down-out makes the amount of refrigerant stored in the auxiliary liquid storage pipe section 16 less, so that more refrigerant can be circulated to the air-side heat exchanger 14 as a condenser , so that the cooling mode can work better.

In the cooling and heating operation of the air source heat pump system, the volume of the air-side heat exchanger 14 is much larger than the volume of the water-side heat exchanger 102, and the density of the high-pressure refrigerant is high. During cooling, the high-pressure liquid-phase refrigerant is produced in the condenser The air-side heat exchanger 14 and the auxiliary liquid storage pipe section 16 store a small amount of refrigerant at this time, and the high-pressure liquid-phase refrigerant during heating is generated in the water-side heat exchanger 102 as a condenser, and the auxiliary liquid storage pipe section 16 stores at this time There is a lot of refrigerant. Therefore, the amount of refrigerant in the air source heat pump system during cooling and heating can be balanced by adding the auxiliary liquid storage pipe section 16 .

In some embodiments of the present disclosure, the air-side heat exchanger 14 may be, but not limited to, a fin-tube heat exchanger, and the water-side heat exchanger 102 may be, but not limited to, a plate heat exchanger.

Fig. 10 is a flowchart of the control principle of an embodiment of an air source heat pump system, as shown in Figs. 4 and 10, in some embodiments of the present disclosure, the outdoor unit electric control board 13 is also configured to And when it is determined that the air source heat pump system is not faulty, the control closes the electronic expansion valve 17 and controls the compressor 11 to keep on, and closes the compressor 11 and the fan 18 when it is determined that the shutdown condition is met.

In some embodiments of the present disclosure, the auxiliary liquid storage pipe section 16 is arranged between the electronic expansion valve 17 and the water-side heat exchanger 102 . When the outdoor unit electric control board 13 executes the shutdown control logic (that is, closes the electronic expansion valve 17 and keeps the compressor 11 open), the check valve 15 can prevent the refrigerant from leaking from the high pressure side to the low pressure side when the air source heat pump system is heating or cooling. On the side, the auxiliary liquid storage pipe section 16 can assist the water side heat exchanger 102 to store more refrigerant on the high pressure side when the air source heat pump system is heating. For a system that does not use a liquid receiver, the most suitable size of the auxiliary liquid storage pipe section 16 and the additional amount of refrigerant need to be calculated in the online solution. Under the premise that the pressure drop of the auxiliary liquid storage pipe section 16 is allowed, the shorter the auxiliary liquid storage pipe section 16, the corresponding pipe diameter is thicker, and the longer the auxiliary liquid storage pipe section 16 is, the corresponding pipe diameter is thinner, ensuring that the auxiliary liquid storage pipe section 16 The amount of refrigerant stored is within the allowable range that does not affect reliability. At the same time, this method can increase the online piping without filling, which is convenient for on-site installation.

In some embodiments of the present disclosure, as shown in FIG. 10 , the control method of the air source heat pump system includes S11-S14.

S11, when the outdoor unit electric control board 13 receives the stop signal, the outdoor unit electric control board 13 determines whether the air source heat pump system fails; when the air source heat pump system does not fail, execute S12; otherwise execute S14.

S12, the electric control board 13 of the outdoor unit controls the electronic expansion valve 17 to close, and the compressor 11 and the fan 18 remain open.

S13, the electric control board 13 of the outdoor unit determines whether the shutdown condition is met; if the shutdown condition is met, execute S14; otherwise, execute S12.

S14, the outdoor unit electric control board 13 controls the compressor 11, the fan 18 and the electronic expansion valve 17 to be closed.

Fig. 11 is a flowchart of a method for determining the internal volume of the auxiliary liquid storage pipe section in an embodiment of an air source heat pump system. As shown in Fig. 11, in some embodiments of the present disclosure, the auxiliary liquid storage pipe section 16 The method for determining the inner volume includes: S110-S180.

S110, determining a theoretical cycle.

S120, type selection of the compressor 11, the air-side heat exchanger 14, the electronic expansion valve 17, and the water-side heat exchanger 102.

S130, judge whether the energy efficiency of the standard cooling and standard heating capacity of the air source heat pump system is up to the standard after conducting the test; when the energy efficiency of the standard cooling and standard heating capacity of the air source heat pump system is up to the standard, execute S140; otherwise correct the theoretical cycle and execute S120 .

S140, obtaining the total refrigerant volumes m _c and m _h of all components and connecting pipelines in cooling operation and heating operation in an ideal state.

In an ideal state, the total refrigerant volumes of all components and connecting pipes during cooling operation and heating operation are m _c and m _h respectively; The volume of the water-side heat exchanger 102 used as a condenser during operation, therefore, the total amount of refrigerant m _c flowing to all components and connecting pipelines in the air source heat pump system during cooling operation is greater than that in the air source heat pump system during heating operation The total amount of refrigerant m _h to all components and connecting pipes.

There are many ways to obtain the total refrigerant volume m _c and m _h of all components and connecting pipelines under the ideal state of cooling operation and heating operation, which may include: S141, use simulation calculation to determine the amount of refrigerant; or S142, use experimental way to determine the amount of refrigerant.

Among them, the method of determining the amount of refrigerant by simulation calculation includes: calculating the total refrigerant amount m _c of all components and connecting pipelines in standard cooling operation, and the total refrigerant amount m _h of all components and connecting pipelines in standard heating operation.

As shown in Figure 12, the way to calculate and determine the amount of refrigerant through the preliminary test includes: using a prototype without a liquid receiver to conduct tests, testing the standard cooling and heating conditions, and adjusting the amount of refrigerant to achieve the maximum required capacity. Excellent COP (Coefficient of Performance, energy efficiency coefficient), respectively get m _c , m _h .

S150. Obtain the densities ρ _c and ρ _h of the refrigerant in the auxiliary liquid storage pipe section 16 in cooling operation and heating operation in an ideal state.

In an ideal state, the densities of the refrigerant in the auxiliary liquid storage pipe section 16 during cooling operation and heating operation are respectively ρ _c and ρ _h ; The refrigerant in the liquid part of the refrigerant in the phase state is less likely to be stored in the auxiliary liquid storage pipe section 16, and a large amount of refrigerant will be stored in the auxiliary liquid storage pipe section 16 during heating operation, and the gaseous state of the gas-liquid two-phase refrigerant Part of the refrigerant is less likely to be stored in the auxiliary liquid storage pipe section 16, therefore, the density ρ _c of the refrigerant in the auxiliary liquid storage pipe section 16 during the cooling operation is smaller than the density ρ _h of the refrigerant in the auxiliary liquid storage pipe section 16 during the heating operation.

S160, calculate the internal volume V of the auxiliary liquid storage pipe section: V=(m _c −m _h )/(ρ _h −ρ _c ).

The diameter and length of the auxiliary liquid storage pipe section 16 are selected based on the internal volume V of the auxiliary liquid storage pipe section 16 so that the internal volume thereof is equal to V.

S170. Calculate the total refrigerant charging amount M=m _c +ρ _c V, or M=m _h +ρ _h V.

S180, conduct tests in other working conditions to verify reliability.

In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in an appropriate manner.

Those skilled in the art will understand that the disclosed scope of the present invention is not limited to the specific embodiments described above, and some elements of the embodiments can be modified and replaced without departing from the spirit of the application. The scope of the application is limited by the appended claims.

Claims

An air source heat pump system comprising:

Compressor, including discharge and return ports;

water side heat exchanger;

an air-side heat exchanger connected to the water-side heat exchanger;

Four-way valve, the four ports of the four-way valve are respectively connected to the exhaust port of the compressor, the air return port of the compressor, the water-side heat exchanger and the air-side heat exchanger;

A one-way valve, the one-way valve is connected between the exhaust port of the compressor and the four-way valve, and the compressor is connected to the four-way valve in one direction;

An electronic expansion valve, the electronic expansion valve is connected between the air-side heat exchanger and the water-side heat exchanger;

The electric control panel of the outdoor unit is connected with the compressor and the electronic expansion valve, and is configured to:

When receiving a stop signal, closing the electronic expansion valve, and controlling the compressor to keep on;

When it is determined that the shutdown condition is met, the compressor is turned off.
The air source heat pump system according to claim 1, wherein the electric control board of the outdoor unit is further configured to control the compressor to run at a fixed frequency at a set frequency when receiving a stop signal, and the set frequency At least the pressure difference between the air discharge port and the air return port of the compressor is not less than the pressure difference threshold.
The air source heat pump system according to claim 2, wherein the value range of the set frequency is 30Hz-60Hz.
The air source heat pump system according to claim 1, further comprising a fan, the fan is arranged on one side of the air-side heat exchanger;

The outdoor machine electric control board is connected to the fan, and the outdoor machine electric control board is further configured as:

When receiving the stop signal, control the fan to keep on;

When it is determined that the shutdown condition is met, the fan is turned off.
The air source heat pump system according to claim 4, wherein,

The gears of the fan include a first gear, a second gear, a third gear and a fourth gear, the wind speed of the third gear is greater than the wind speed of the fourth gear, and the fourth gear The wind speed of the first gear is greater than the wind speed of the first gear, and the wind speed of the first gear is greater than the wind speed of the second gear;

The electric control panel of the outdoor unit is also configured as:

When the current operating mode of the air source heat pump system is the silent mode, controlling the fan to operate in the first gear or the second gear;

When the current operating mode of the air source heat pump system is the normal mode, the fan is controlled to operate in the third gear or the fourth gear.
The air source heat pump system according to claim 1, wherein,

The electric control panel of the outdoor unit is also configured as:

When a shutdown signal is received and it is determined that the air source heat pump system is not faulty, the electronic expansion valve is closed, and the compressor is controlled to remain open;

The compressor is turned off when it is determined that a shutdown condition is met.
The air source heat pump system according to any one of claims 1-6, further comprising:

A high-pressure pressure switch, arranged between the exhaust port of the compressor and the one-way valve, connected to the electric control board of the outdoor unit, configured so that the pressure in the air source heat pump system is higher than a preset Disconnect when the pressure upper limit;

The low-pressure pressure switch is arranged between the air return port of the compressor and the four-way valve, is connected to the electric control board of the outdoor unit, and is configured so that the pressure in the air source heat pump system is lower than a preset pressure Disconnect at the lower limit;

The shutdown conditions include any of the following conditions:

The suction pressure of the compressor reaches the lower limit of the suction pressure;

The exhaust pressure of the compressor reaches the upper limit of the exhaust pressure;

The exhaust temperature of the compressor reaches the upper limit of the exhaust temperature;

The high pressure switch is disconnected;

The low pressure switch is disconnected;

The duration for which the compressor is kept on reaches a time upper limit value.
The air source heat pump system according to claim 1, further comprising:

An auxiliary liquid storage pipe section, the auxiliary liquid storage pipe section is arranged vertically and has a top port and a bottom port, the top port is connected to the electronic expansion valve, and the bottom port is connected to the water side heat exchanger.
The air source heat pump system according to claim 8, wherein the formula for calculating the internal volume of the auxiliary liquid storage pipe section is:

V=(m c -m h )/(ρ h -ρ c )

Among them, V represents the internal volume of the auxiliary liquid storage pipe section, m c represents the total refrigerant volume of all components and connecting pipelines in the ideal state of cooling operation, and ρ c represents the volume of the auxiliary liquid storage pipe section in the ideal state of cooling operation. The density of the refrigerant, m h represents the total amount of refrigerant in all components and connecting pipelines in the ideal state of heating operation, and ρ h represents the density of the refrigerant in the auxiliary liquid storage pipe section in the ideal state of heating operation.
The air source heat pump system according to claim 1, further comprising:

A buffer water tank, the buffer water tank has a first water inlet, a first water outlet, a first water return port and a second water outlet;

A plurality of indoor terminal devices, including a domestic hot water tank and at least one space heating/cooling device, or at least two space heating/cooling devices, the plurality of indoor terminal devices are switched to operate;

The relay reversing device has a second water inlet connected to the heat pump water supply port of the water side heat exchanger, a fourth water outlet connected to the heat pump return water port of the water side heat exchanger, and a fourth water outlet connected to the multiple The second water return port and the third water outlet connected to the indoor terminal equipment; the relay reversing device also includes:

a first straight branch, which communicates with the second water inlet and the third water outlet;

The first bypass branch includes a first bypass branch and a second bypass branch, the first bypass branch communicates with the second water inlet and the first water inlet, and the second bypass branch communicates with the first water outlet and the third water outlet;

Wherein the first direct branch is switched and communicated with the first bypass branch;

A second straight branch, which communicates with the second water return port and the fourth water outlet;

The second bypass branch includes a third bypass branch and a fourth bypass branch, the third bypass branch communicates with the second water return port and the first water return port; the fourth bypass branch communicates with the second water outlet and the fourth water outlet;

Wherein the second direct branch is in switching communication with the second bypass branch.
The air source heat pump system according to claim 10, wherein the relay reversing device comprises a first electric three-way valve, a second electric three-way valve, a third electric three-way valve and a fourth electric three-way valve;

The first port of the first electric three-way valve is connected to the second water inlet, the second port of the first electric three-way valve is connected to the first water inlet, and the second port of the first electric three-way valve is connected to the first water inlet. The three ports are connected to the first port of the second electric three-way valve, the second port of the second electric three-way valve is connected to the first water outlet, and the third port of the second electric three-way valve is connected to the The third water outlet, the first electric three-way valve and the second electric three-way valve form the first straight branch and the first bypass branch;

The first port of the fourth electric three-way valve is connected to the second water return port, the second port of the fourth electric three-way valve is connected to the first water return port, and the first port of the fourth electric three-way valve is connected to the first water return port. The three ports are connected to the first port of the third electric three-way valve, the second port of the third electric three-way valve is connected to the second water outlet, and the third port of the third electric three-way valve is connected to the The fourth water outlet, the third electric three-way valve and the fourth electric three-way valve form the second straight-through branch and the second bypass branch.
The air source heat pump system according to claim 11, further comprising:

The first booster pump is connected between the second water inlet and the first port of the first electric three-way valve;

The second booster pump is connected between the third port of the second electric three-way valve and the third water outlet.
The air source heat pump system according to claim 10, further comprising:

An auxiliary heat source, in communication with the buffer water tank, is configured to provide heat to the buffer water tank.
The air source heat pump system according to claim 13, wherein the auxiliary heat source includes a gas wall-hung boiler, a solar water heater or a gas water heater.
The air source heat pump system according to claim 10, wherein the space heating/cooling equipment comprises a fan coil or floor heating.