An air source heat pump system and a control method thereof

Abstract

The application provides an air source heat pump system and a control method thereof. The air source heat pump system comprises an indoor heat exchanger arranged in a room, a heat accumulator arranged in the room, an outdoor heat exchanger arranged outdoors, and a compressor. The outlet of the compressor is communicated with the inlet of the indoor heat exchanger through a first flow path. The outlet of the indoor heat exchanger is communicated with the inlet of the outdoor heat exchanger through a second flow path. The outlet of the outdoor heat exchanger is communicated with the inlet of the compressor through a third flow path. A first throttling device is arranged on the second flow path. The air source heat pump system further comprises a heat storage branch. The inlet of the heat storage branch is communicated with a first branch port on the first flow path. The outlet of the heat storage branch is communicated with a second branch port on the second flow path. The heat storage branch is coupled with the heat accumulator through a heat storage heat exchanger, so that the technical problem of large indoor temperature fluctuation caused by defrosting of the outdoor heat exchanger in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of air conditioners, and particularly relates to an air source heat pump system and a control method thereof. BACKGROUND

[0002] With the improvement of people's living standards, the air conditioner and the air energy water heater can realize the combination of the air conditioner and the air energy water heater by switching the flow path of the system refrigerant, reduce the number of outdoor units, save materials, and even when the air conditioner refrigeration and the water heater heating are used at the same time in summer and transition seasons, the environmental heat in the room can be recycled for heating water. However, in winter, when the air conditioner heats or the water heater heats water, the outdoor heat exchanger will frost and defrost, at this time, the system needs to be switched from the heating cycle to the refrigeration cycle, which causes the interruption of the heating supply of the indoor heat exchanger and the absorption of heat from the indoor environment, resulting in the reduction of the indoor temperature and the deterioration of the comfort.

[0003] How to reduce the impact on the indoor temperature when defrosting the outdoor heat exchanger is a technical problem that needs to be solved at present. SUMMARY

[0004] Therefore, the present application provides an air source heat pump system and a control method thereof, which can solve the technical problem of large indoor temperature fluctuation caused by defrosting the outdoor heat exchanger in the prior art.

[0005] In one aspect, the present application provides an air source heat pump system, comprising an indoor heat exchanger arranged in a room, a heat storage device arranged in the room, and an outdoor heat exchanger and a compressor arranged outdoors, wherein the outlet of the compressor is in communication with the inlet of the indoor heat exchanger through a first flow path, the outlet of the indoor heat exchanger is in communication with the inlet of the outdoor heat exchanger through a second flow path, the outlet of the outdoor heat exchanger is in communication with the inlet of the compressor through a third flow path, and a first throttling device is arranged on the second flow path.

[0006] The air source heat pump system further comprises a heat storage branch, wherein the inlet of the heat storage branch is connected to a first branch point on the first flow path, the outlet of the heat storage branch is connected to a second branch point on the second flow path, and the heat storage branch is thermally coupled to the heat storage device through a heat storage heat exchanger.

[0007] In some embodiments, a first control valve is arranged between the first branch point and the inlet of the indoor heat exchanger, and a second control valve is arranged on the heat storage branch.

[0008] In some embodiments, the heat storage branch comprises a heat storage inlet path and a heat storage outlet path, the heat storage inlet path is connected between the first branch point and the heat storage heat exchanger, the heat storage outlet path is connected between the heat storage heat exchanger and the second branch point, and a second throttling device is arranged on the heat storage outlet path.

[0009] In some embodiments, the air source heat pump system further comprises a heat storage circuit, an inlet of the heat storage circuit being communicated with a third branch port on the heat storage circuit, an outlet of the heat storage circuit being communicated with a fourth branch port on the third circuit, the fourth branch port being located between the first control valve and an inlet of the outdoor heat exchanger; a second control valve is arranged between the first branch port and the third branch port, and a third control valve is arranged on the heat storage circuit; a first throttling device is arranged between an outlet of the outdoor heat exchanger and the second branch port.

[0010] In some embodiments, a fourth control valve is arranged between the second branch port and the inlet of the outdoor heat exchanger.

[0011] In some embodiments, the air source heat pump system further comprises a defrosting circuit, an inlet of the defrosting circuit being communicated with a fifth branch port between the first branch port and the indoor heat exchanger, an outlet of the defrosting circuit being communicated with a sixth branch port between the outdoor heat exchanger and the fourth branch port; a fifth control valve is arranged on the defrosting circuit, and a sixth control valve is arranged between the fourth branch port and the sixth branch port.

[0012] In another aspect, the present application provides a control method for an air source heat pump system, the air source heat pump system comprising a first heating mode in an indoor, the control method comprising a first heating method for the first heating mode, the first heating method comprising: controlling the first control valve to be opened, the second control valve to be opened, the fourth control valve to be opened, the sixth control valve to be opened, the third control valve to be closed, and the fifth control valve to be closed.

[0013] In some embodiments, the air source heat pump system further comprises a second heating mode, the control method comprising a second heating method for the second heating mode, the second heating method comprising: controlling the first control valve to be opened, the sixth control valve to be opened, the second control valve to be closed, and the fifth control valve to be closed; and, controlling the third control valve to be closed and the fourth control valve to be opened, or, controlling the third control valve to be opened and the fourth control valve to be closed, or, controlling the third control valve to be opened and the fourth control valve to be opened.

[0014] In some embodiments, the air source heat pump system further comprises a heat storage mode, the control method comprising a hot water method for the heat storage mode, the hot water method comprising: controlling the second control valve to be opened, the fourth control valve to be opened, and the sixth control valve to be opened; and, controlling the first control valve to be closed, the third control valve to be closed, and the fifth control valve to be closed.

[0015] In some embodiments, the air source heat pump system further comprises a defrosting mode, the first throttling device is capable of being opened or closed, and the control method comprises a defrosting method for the defrosting mode, the defrosting method comprising: controlling the first control valve to be opened, the third control valve to be opened, the fourth control valve to be opened, the fifth control valve to be opened, the second control valve to be closed, and the sixth control valve to be closed; and controlling the first throttling device to be opened or closed.

[0016] The present application has the following beneficial effects:

[0017] First, when heating indoors, the high-pressure refrigerant flowing out of the compressor is divided into two at the first flow dividing port, the first path flows through the indoor heat exchanger, the first throttling device, and the outdoor heat exchanger in sequence and then flows back to the compressor; and the second path flows through the heat storage heat exchanger and the outdoor heat exchanger in sequence and then flows back to the compressor. The high-temperature refrigerant releases heat at the indoor heat exchanger to heat the indoor environment, and the high-temperature refrigerant exchanges heat with the heat storage device at the heat storage heat exchanger to transfer heat to the heat storage device. The heat stored in the heat storage device can be used in daily life. When the heat storage device is an air energy water heater and water is stored in the water heater, the second path of refrigerant heats the water in the water heater, and the heated water can be used in daily life. The first path of refrigerant and the second path of refrigerant are mixed at the outdoor heat exchanger and then flow back to the compressor together. When the indoor heat demand is not too large, part of the high-temperature refrigerant can be used to heat the water heater, thereby improving the applicability of the air source heat pump system.

[0018] Second, when the outdoor heat exchanger needs to be defrosted and the outdoor air cannot effectively heat the outdoor heat exchanger for defrosting, the fifth control valve, the first control valve, the fourth control valve, the third control valve, and the second control valve are controlled to be opened, and at least part of the high-temperature refrigerant flowing out of the compressor flows through the fifth control valve and then enters the outdoor heat exchanger to defrost the outdoor heat exchanger. The defrosted refrigerant flows through the heat storage device and absorbs heat from the heat storage device and then flows back to the compressor. At this time, the first throttling device can be opened or closed. When the first throttling device is opened, part of the high-temperature refrigerant flows through the indoor heat exchanger to heat the indoor environment, and part of the high-temperature refrigerant flows through the outdoor heat exchanger to defrost the outdoor heat exchanger. When the first throttling device is closed, all of the high-temperature refrigerant flowing out of the compressor flows through the outdoor heat exchanger to heat and defrost the outdoor heat exchanger, thereby achieving higher defrosting efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. The drawings in the following description are only exemplary, and those skilled in the art can also derive other implementation drawings from the provided drawings without paying creative labor.

[0020] Figure 1is a schematic diagram of an air source heat pump system according to an embodiment of the present application;

[0021] Reference signs are:

[0022] 1, compressor; 2, heat accumulator; 3, indoor heat exchanger; 4, outdoor heat exchanger; 501, first throttling device; 502, second throttling device; 601, first control valve; 602, second control valve; 603, third control valve; 604, fourth control valve; 605, fifth control valve; 606, sixth control valve; 701, first flow dividing port; 702, second flow dividing port; 703, third flow dividing port; 704, fourth flow dividing port; 705, fifth flow dividing port; 706, sixth flow dividing port; 8, four-way valve. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without any creative work are within the scope of protection of the present application.

[0024] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component.

[0025] For purposes of the description hereinafter, spatial relative terms, such as "above", "below", "upper", "lower", and the like, can be used to describe the relative position of one element or feature to another element or feature as illustrated in the figures. It will be understood that the spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "up" other elements or features would then be oriented "below" or "down" the other elements or features. Thus, the exemplary term "above" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatial relative terms used herein interpreted accordingly.

[0026] In addition, it should be noted that the use of "first", "second", and the like words of distinction do not connote any actual physical or chronological priority of one element over another, but merely serve to distinguish one element from another. Unless otherwise specified, the use of the ordinal adjectives "first", "second", and the like, merely indicate that different features can be used and do not connote or imply that a sequence or order of one feature over another or the like. Moreover, the use of the "first", "second", and the like words of distinction are limited to the field of objects only and are not intended to otherwise limit the scope of the application.

[0027] The present application provides an air source heat pump system and a control method thereof, which can solve the technical problem of large indoor temperature fluctuation caused by defrosting of an outdoor heat exchanger in the prior art.

[0028] With reference to Figure 1 As shown in the drawings, the present application provides an air source heat pump system, which comprises an indoor heat exchanger 3 arranged in an indoor space, a heat storage device 2 arranged in the indoor space, an outdoor heat exchanger 4 arranged in an outdoor space, and a compressor 1. The outlet of the compressor 1 is connected to the inlet of the indoor heat exchanger 3 through a first flow path, the outlet of the indoor heat exchanger 3 is connected to the inlet of the outdoor heat exchanger 4 through a second flow path, the outlet of the outdoor heat exchanger 4 is connected to the inlet of the compressor 1 through a third flow path, and a first throttling device 501 is arranged on the second flow path.

[0029] The air source heat pump system further comprises a heat storage branch. The inlet of the heat storage branch is connected to a first branch point 701 on the first flow path, and the outlet of the heat storage branch is connected to a second branch point 702 on the second flow path. The heat storage branch is thermally coupled to the heat storage device 2 through a heat storage heat exchanger.

[0030] When heating is applied indoors, the high-pressure refrigerant from compressor 1 is split into two at the first branch port 701. The first path flows sequentially through the indoor heat exchanger 3, the first throttling device 501, and the outdoor heat exchanger 4 before returning to compressor 1. The second path flows sequentially through the heat storage heat exchanger and the outdoor heat exchanger 4 before returning to compressor 1. The high-temperature refrigerant releases heat at the indoor heat exchanger 3 to heat the room. It also exchanges heat with the heat storage heat exchanger 2, transferring heat to it. The heat stored in the heat storage heat exchanger 2 can be used for domestic purposes. When the heat storage heat exchanger 2 is an air-source water heater containing water, the second path refrigerant heats the water, providing heat for domestic use and also serving as a heat source for defrosting the outdoor heat exchanger. This eliminates the need to absorb heat from the room through the indoor heat exchanger, effectively ensuring stable indoor temperature and reducing or avoiding the impact of defrosting the outdoor heat exchanger on the indoor ambient temperature. The first and second paths of refrigerant mix at the outdoor heat exchanger 4 and then flow back to compressor 1. When the indoor heat demand is not too high, some of the high-temperature refrigerant can be used to heat the water heater, which improves the applicability of the air source heat pump system.

[0031] In this article, the technical effect to be achieved by "the refrigerant flowing through the heat storage heat exchanger" or "the refrigerant flowing through the heat storage 2" is the same: heat exchange between the refrigerant and the heat storage 2.

[0032] The first flow path and the third flow path can be connected via a four-way valve 8. By controlling the four-way valve 8, the flow direction of the high-temperature refrigerant flowing out of the compressor 1 can be adjusted, thereby enabling the air source heat pump system to switch between cooling and heating.

[0033] When at least an indoor heat exchanger 3 and a heat storage tank 2 (water heater) are installed indoors, the air source heat pump system is a dual-supply air source heat pump system.

[0034] Preferred, such as Figure 1 As shown, a first control valve 601 is provided between the first diversion port 701 and the inlet of the indoor heat exchanger 3, and a second control valve 602 is provided on the heat storage branch.

[0035] By setting a first control valve 601 and a second control valve 602, when both are open, the high-temperature refrigerant flowing from the compressor 1 heats both the indoor unit and the heat storage tank 2 simultaneously; when the first control valve 601 is open and the second control valve 602 is closed, the refrigerant flowing from the compressor 1 heats the indoor unit only through the indoor heat exchanger 3; when the first control valve 601 is closed and the second control valve 602 is open, the refrigerant flowing from the compressor 1 heats only the heat storage tank 2. In this way, the air source heat pump system can be adjusted according to actual needs to adapt to different requirements.

[0036] Furthermore, the opening degree of both the first control valve 601 and the second control valve 602 is adjustable to control the amount of refrigerant flowing through the indoor heat exchanger 3 and the heat storage tank 2, thus meeting the user's more refined requirements.

[0037] Preferred, such as Figure 1 As shown, the heat storage branch includes a heat storage inlet and a heat storage outlet. The heat storage inlet is connected between the first branch port 701 and the heat storage heat exchanger, and the heat storage outlet is connected between the heat storage heat exchanger and the second branch port 702. A second throttling device 502 is provided on the heat storage outlet.

[0038] By setting a second throttling device 502 on the heat storage outlet, the temperature of the refrigerant flowing out of the heat storage heat exchanger is lower after passing through the second throttling device 502. This is beneficial for the refrigerant to absorb more heat through the outdoor heat exchanger 4 when it flows through the outdoor heat exchanger 4, which is beneficial for improving the working performance of the compressor 1.

[0039] Preferred, such as Figure 1 As shown, the air source heat pump system further includes a heat storage circuit. The inlet of the heat storage circuit is connected to the third branch port 703 on the heat storage inlet, and the outlet of the heat storage circuit is connected to the fourth branch port 704 on the third flow path. The fourth branch port 704 is located between the first control valve 601 and the inlet of the outdoor heat exchanger 4. The second control valve 602 is disposed between the first branch port 701 and the third branch port 703. The heat storage circuit is provided with a third control valve 603. The first throttling device 501 is disposed between the outlet of the outdoor heat exchanger 4 and the second branch port 702.

[0040] With the above settings, when the indoor heat demand is high, the third control valve 603 is closed, the second control valve 602 is closed, and the first control valve 601 is opened. All the high-temperature refrigerant flowing out of the compressor 1 flows through the indoor heat exchanger 3 to heat the indoor space. All the refrigerant flowing out of the indoor heat exchanger 3 flows through the outdoor heat exchanger 4 to absorb heat from the outside. Because the outdoor temperature is low, the refrigerant absorbs limited heat after flowing through the outdoor heat exchanger 4, and the recompression efficiency of the compressor 1 is generally low. When more heat is needed indoors, the third control valve 603 opens, the first control valve 601 opens, and the second control valve 602 closes. Part of the refrigerant flowing out of the indoor heat exchanger 3 flows through the outdoor heat exchanger 4, and part of the refrigerant flows through the heat storage heat exchanger, where it exchanges heat with the heat storage 2. The refrigerant passing through the outdoor heat exchanger 4 absorbs heat from the outside, and the refrigerant passing through the heat storage 2 absorbs heat from the heat storage 2. The temperature of the refrigerant after absorbing heat from the heat storage 2 is higher than the temperature of the refrigerant after absorbing heat from the outside air through the outdoor heat exchanger 4. This helps to increase the temperature of the refrigerant flowing out of the compressor 1, thereby improving the heating speed and continuous operation capability of the air source heat pump system.

[0041] Preferred, such as Figure 1 As shown, a fourth control valve 604 is provided between the second diversion port 702 and the inlet of the outdoor heat exchanger 4.

[0042] The fourth control valve is used to control the amount of refrigerant flowing through the outdoor heat exchanger 4. The third control valve 603 and the fourth control valve 604 work together to adjust the distribution of refrigerant after it flows through the indoor heat exchanger 3. For example, when the outdoor ambient temperature is high (the indoor unit still needs heating), the outdoor heat exchanger 4 is less likely to frost, and more refrigerant flows through it. When the outdoor ambient temperature is low, the outdoor heat exchanger 4 is more likely to frost, and less refrigerant flows through it. When the outdoor heat exchanger 4 is already frosted, the fourth control valve 604 is closed, and the refrigerant flowing out of the indoor heat exchanger 3 flows through the heat storage tank 2 after being throttled. If the outdoor ambient temperature is higher than 0°C, the refrigerant no longer flows through the outdoor heat exchanger 4, and the frost on the outdoor heat exchanger 4 can gradually melt.

[0043] When the indoor heating demand is low (e.g., when no one is in the room), the first control valve 601 opens, the second control valve 602 opens, the fourth control valve 604 opens, and the third control valve 603 closes. At this time, some of the high-temperature refrigerant flowing from the compressor 1 flows through the heat storage tank 2, heating it and thus raising its temperature. When no heating is needed indoors, the first control valve 601 closes, the third control valve 603 closes, the second control valve 602 opens, and the fourth control valve 604 opens. The refrigerant flowing from the compressor 1 flows entirely through the heat storage tank 2, heating it.

[0044] Preferred, such as Figure 1 As shown, the air source heat pump system further includes a defrost flow path. The inlet of the defrost flow path is connected to the fifth branch port 705 between the first branch port 701 and the indoor heat exchanger 3, and the outlet of the defrost flow path is connected to the sixth branch port 706 between the outdoor heat exchanger 4 and the fourth branch port 704. A fifth control valve 605 is provided on the defrost flow path, and a sixth control valve 606 is provided between the sixth branch port 706 and the fourth branch port 704.

[0045] When the outdoor heat exchanger 4 needs to be defrosted and the outdoor air cannot effectively heat the outdoor heat exchanger 4 for defrosting, the fifth control valve 605 is opened, the first control valve 601 is opened, the fourth control valve 604 is opened, the third control valve 603 is opened, the second control valve 602 is closed, and the sixth control valve 606 is closed, so that at least part of the high-temperature refrigerant flowing out of the compressor 1 flows through the fifth control valve 605 and then enters the outdoor heat exchanger 4, defrosting the outdoor heat exchanger 4 at the outdoor heat exchanger 4, and the defrosted refrigerant flows through the heat accumulator 2 and then flows back to the compressor 1 after absorbing heat from the heat accumulator 2. At this time, the first throttling device 501 can be opened or closed, and when the first throttling device 501 is opened, part of the high-temperature refrigerant flows through the indoor heat exchanger 3 to heat the indoor environment, and if the first throttling device 501 is closed, all the high-temperature refrigerant flowing out of the compressor 1 flows through the outdoor heat exchanger 4 to heat and defrost the outdoor heat exchanger 4; the specific situation depends on the defrosting requirement of the outdoor heat exchanger 4 and the temperature requirement of the indoor environment.

[0046] In winter or other seasons with low temperature, the indoor environment does not need to be heated or needs to be heated with less heat, the heat accumulator 2 is heated, and the heat in the heat accumulator 2 is absorbed when the outdoor heat exchanger 4 needs to be defrosted; the heating of the heat accumulator 2 and the absorption of heat from the heat accumulator 2 are completed at different times, and the unit volume of heat in the heat accumulator 2 is more, which achieves the transfer and utilization of high-grade heat in the time dimension, improves the comfort of the user, and saves energy.

[0047] The application realizes the change of the functions of the two-coupled air source heat pump system main machine (the outdoor heat exchanger 4) and the terminal equipment (the heat accumulator 2, the water heater or the air conditioner), and achieves the realization of rapid heating and rapid defrosting based on multiple heat sources in the air source heat pump system in winter.

[0048] The control valve of the application can be turned on and off by power on and off, and can also control the opening size in the power-on state. The throttling device can be an electronic expansion valve, a capillary tube or a heat expansion valve, wherein the first throttling device 501 and the second throttling device 502 can be completely closed.

[0049] On the other hand, the application also provides a control method for an air source heat pump system, the air source heat pump system including an indoor first heating mode, the control method including a first heating method for the first heating mode, the first heating method including: controlling the first control valve 601 to be opened, the second control valve 602 to be opened, the fourth control valve 604 to be opened, the sixth control valve 606 to be opened, the third control valve 603 to be closed, and the fifth control valve 605 to be closed.

[0050] The first control valve 601 is controlled to be opened, the second control valve 602 is controlled to be opened, the fourth control valve 604 is controlled to be opened, the sixth control valve 606 is controlled to be opened, the third control valve 603 is controlled to be closed, and the fifth control valve 605 is controlled to be closed. The high-temperature refrigerant flowing out of the compressor 1 is divided into two paths. The refrigerant of the first path flows through the indoor heat exchanger 3, the first throttling device 501, the fourth control valve 604, and the outdoor heat exchanger 4 in sequence and then flows back to the compressor 1. The refrigerant of the second path flows through the second control valve 602, the heat storage heat exchanger, the second throttling device 502, the fourth control valve 604, and the outdoor heat exchanger 4 in sequence and then flows back to the compressor 1. The high-temperature refrigerant releases heat at the indoor heat exchanger 3 to heat the indoor environment. The high-temperature refrigerant exchanges heat with the heat storage device 2 at the heat storage heat exchanger to transfer heat to the heat storage device 2. The heat stored in the heat storage device 2 can be used in daily life. When the heat storage device 2 is a water heater and water is stored in the water heater, the refrigerant of the second path heats the water in the water heater. The heated water can be used in daily life or can be used to release heat to the refrigerant (the refrigerant flows through the outdoor heat exchanger 4 and / or the indoor heat exchanger 3 first and then flows through the heat storage device 2 to absorb heat from the heat storage device 2). The refrigerant of the first path and the refrigerant of the second path are mixed at the outdoor heat exchanger 4 and then flow back to the compressor 1 together. When the indoor heat demand is not large, part of the high-temperature refrigerant can be used to heat the water heater, which improves the applicability of the air source heat pump system.

[0051] Preferably, the air source heat pump system further comprises a second heating mode, and the control method comprises a second heating method for the second heating mode. The second heating method comprises: controlling the first control valve 601 to be opened, the sixth control valve 606 to be opened, the second control valve 602 to be closed, and the fifth control valve 605 to be closed; and controlling the third control valve 603 to be closed and the fourth control valve 604 to be opened, or controlling the third control valve 603 to be opened and the fourth control valve 604 to be closed, or controlling the third control valve 603 to be opened and the fourth control valve 604 to be opened.

[0052] The second heating method comprises three kinds.

[0053] The first kind: the first control valve 601 is controlled to be opened, the second control valve 602 is controlled to be closed, the fifth control valve 605 is controlled to be closed, the third control valve 603 is controlled to be closed, the fourth control valve 604 is controlled to be opened, and the sixth control valve 606 is controlled to be opened. At this time, the high-temperature refrigerant flowing out of the compressor 1 flows through the first control valve 601, the indoor heat exchanger 3, the first throttling device 501, the fourth control valve 604, and the outdoor heat exchanger 4 in sequence and then flows back to the compressor 1. At this time, the refrigerant flows through the outdoor heat exchanger 4 and does not consume the heat in the heat storage device 2 or heat the heat storage device 2. This method is generally applicable to the case that the outdoor heat exchanger 4 has no frost or has light frost and the heat storage device 2 does not need to be heated.

[0054] The second kind: control the first control valve 601 to open, the sixth control valve 606 to open, the second control valve 602 to close, the fifth control valve 605 to close, control the third control valve 603 to open, the fourth control valve 604 to close;At this time, the high-temperature refrigerant flowing out of the compressor 1 flows through the first control valve 601, the indoor heat exchanger 3, the first throttling device 501, the second throttling device 502, the heat storage heat exchanger and the third control valve 603 in turn and flows back to the compressor 1;At this time, the refrigerant flows through the heat storage device 2 and absorbs heat, which is generally applicable when the outdoor heat exchanger 4 is frosted or the indoor heat exchanger needs more heat, and the refrigerant cannot absorb enough heat through the outdoor heat exchanger 4;Compared with absorbing heat from the outdoor, this method of absorbing heat from the heat storage device 2 can absorb more heat in a short time and can increase the temperature of the refrigerant flowing back to the compressor, so that the temperature of the refrigerant flowing out of the compressor is also higher, and the higher-temperature refrigerant flowing out of the compressor can quickly heat the indoor environment.

[0055] The third kind: control the first control valve 601 to open, the sixth control valve 606 to open, the second control valve 602 to close, the fifth control valve 605 to close, control the third control valve 603 to open, the fourth control valve 604 to open;At this time, the refrigerant flowing out of the compressor 1 flows through the first control valve 601, the indoor heat exchanger 3 and the first throttling device 501 in turn and is divided into two paths, wherein the first path refrigerant flows through the fourth control valve 604, the outdoor heat exchanger 4 and then flows back to the compressor 1;The second path refrigerant flows through the second throttling device 502, the heat storage device 2 and the third control valve 603 in turn and then flows into the compressor 1;At this time, the refrigerant releases heat to the indoor environment through the indoor heat exchanger 3, and then absorbs heat from the outdoor environment through the outdoor heat exchanger 4 and absorbs heat from the heat storage device 2 through the heat storage heat exchanger, which is generally applicable when the outdoor heat exchanger 4 is slightly frosted and can absorb heat from the outside through the outdoor heat exchanger 4, but the amount of heat absorbed is not enough to meet the demand, so heat is absorbed from the heat storage device 2 to meet the demand.

[0056] The air source heat pump system works according to different conditions and executes different control methods, for example, in winter, the indoor temperature T1 and the outdoor temperature T2 are obtained, when the difference between the set temperature T0 (such as 20℃) and the indoor temperature T1 (such as 16℃) is not greater than the temperature difference T3 (such as 6℃), and the outdoor temperature T2 (such as 14℃) is greater than the preset temperature T4 (such as 12℃), the indoor and outdoor temperatures are moderate, the outdoor heat absorption difficulty is small, and the target temperature (set temperature) and the current indoor temperature differ little, which indicates that the indoor environment needs less heat to meet the user's requirements.At this time, the first heating method or the first kind of the second heating method can be used.

[0057] When the indoor environment temperature is less than or equal to T1, and T0-T1>T3, and T2

[0058] Preferably, the air source heat pump system further comprises a heat storage mode, and the control method comprises a hot water method for the heat storage mode, the hot water method comprising: controlling the second control valve 602 to be opened, the fourth control valve 604 to be opened, the sixth control valve 606 to be opened, the first control valve 601 to be closed, the third control valve 603 to be closed, and the fifth control valve 605 to be closed.

[0059] The second control valve 602 is controlled to be opened, the fourth control valve 604 is controlled to be opened, the sixth control valve 606 is controlled to be opened, the first control valve 601 is controlled to be closed, the third control valve 603 is controlled to be closed, and the fifth control valve 605 is controlled to be closed; at this time, the refrigerant flowing out of the compressor 1 flows through the second control valve 602, the heat storage device 2, the second throttling device, the fourth control valve 604, and the outdoor heat exchanger 4 in sequence and then flows back to the compressor 1; the high-temperature refrigerant flowing out of the compressor 1 first heats the heat storage device 2 at the heat storage device 2, and then flows through the second throttling device 502 and the outdoor heat exchanger 4 to absorb heat from the outdoor environment; when the indoor environment does not need to be heated, the heat storage mode can be used to store heat in the heat storage device 2; on the one hand, the heat in the heat storage device 2 can be used by the user; when the heat storage device 2 is a water heater, the water in the water heater can be used for washing and bathing; on the other hand, when the indoor environment needs a large amount of heat, the heat can be absorbed from the heat storage device 2, and the second and third kinds of the second heating method. The heat storage device 2 is heated in time to ensure that there is sufficient heat supply when the indoor environment needs heat.

[0060] Preferably, the air source heat pump system further comprises a defrosting mode, the first throttling device 501 can be opened or closed, and the control method comprises a defrosting method for the defrosting mode, the defrosting method comprising: controlling the first control valve 601 to be opened, the third control valve 603 to be opened, the fourth control valve 604 to be opened, and the fifth control valve 605 to be opened, controlling the second control valve 602 to be closed, and controlling the sixth control valve 606 to be closed; and controlling the first throttling device 501 to be opened or closed.

[0061] The defrosting method comprises two kinds.

[0062] The first kind: control the first control valve 601 to open, control the third control valve 603 to open, control the fourth control valve 604 to open, control the fifth control valve 605 to open, control the second control valve 602 to close, control the sixth control valve 606 to close, control the first throttling device 501 to close, at this time, the high-temperature refrigerant of the compressor 1 flows through the first control valve 601, the fifth control valve 605, the outdoor heat exchanger 4, the fourth control valve 604, the second throttling device 502, the heat accumulator 2, the third control valve 603 in turn and flows back to the compressor 1, the high-temperature refrigerant all flows through the outdoor heat exchanger 4 and is used for defrosting the first outdoor heat exchanger 4, at this time, since the first throttling device 501 is closed, the refrigerant does not flow through the indoor heat exchanger 3, so this can defrost the outdoor heat exchanger 4 as soon as possible.

[0063] The second kind: control the first control valve 601 to open, control the third control valve 603 to open, control the fourth control valve 604 to open, control the fifth control valve 605 to open, control the second control valve 602 to close, control the sixth control valve 606 to close, control the first throttling device 501 to open, at this time, the high-temperature refrigerant of the compressor 1 flows through the first control valve 601 and is divided into two at the fifth branch point, the first high-temperature refrigerant flows through the fifth control valve 605, the outdoor heat exchanger 4, the fourth control valve 604, the second throttling device 502, the heat accumulator 2, the third control valve 603 in turn and flows back to the compressor 1, the second high-temperature refrigerant flows through the indoor heat exchanger 3, the first throttling device 501, the second throttling device 502, the heat accumulator 2, the third control valve 603 in turn and flows back to the compressor 1, part of the high-temperature refrigerant is used for defrosting the outdoor heat exchanger 4, and part of the high-temperature refrigerant is used for heating the indoor through the indoor heat exchanger 3, so this can heat the indoor and defrost the outdoor heat exchanger 4, and effectively ensures the temperature stability of the indoor.

[0064] It is easy for those skilled in the art to understand that the advantageous technical features of the above-mentioned modes can be freely combined and superimposed without conflict.

[0065] The above description is only the preferred embodiment of the present application, and should not be used to limit the present application, any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application. The above description is only the preferred embodiment of the present application, and should not be used to limit the present application, any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An air source heat pump system, comprising an indoor heat exchanger (3) installed indoors, a heat storage tank (2) installed indoors, an outdoor heat exchanger (4) installed outdoors, and a compressor (1), characterized in that, The outlet of the compressor (1) is connected to the inlet of the indoor heat exchanger (3) via a first flow path, the outlet of the indoor heat exchanger (3) is connected to the inlet of the outdoor heat exchanger (4) via a second flow path, and the outlet of the outdoor heat exchanger (4) is connected to the inlet of the compressor (1) via a third flow path. A first throttling device (501) is provided on the second flow path. The air source heat pump system is also provided with a heat storage branch. The inlet of the heat storage branch is connected to the first branch port (701) on the first flow path, and the outlet of the heat storage branch is connected to the second branch port (702) on the second flow path. The heat storage branch is thermally coupled to the heat storage device (2) via a heat storage heat exchanger. A first control valve (601) is provided between the first branch port (701) and the inlet of the indoor heat exchanger (3), and a second control valve (602) is provided on the heat storage branch. The heat storage branch includes a heat storage inlet and a heat storage outlet. The heat storage inlet is connected between the first branch port (701) and the heat storage heat exchanger. The heat storage outlet is connected between the heat storage heat exchanger and the second branch port (702). A second throttling device (502) is provided on the heat storage outlet. The air source heat pump system also includes a heat storage circuit. The inlet of the heat storage circuit is connected to the third branch port (703) on the heat storage inlet, and the outlet of the heat storage circuit is connected to the fourth branch port (704) on the third flow path. The fourth branch port (704) is located between the inlet of the compressor (1) and the outlet of the outdoor heat exchanger (4). The second control valve (602) is set between the first branch port (701) and the third branch port (703). The heat storage circuit is provided with a third control valve (603). The first throttling device (501) is set between the outlet of the indoor heat exchanger (3) and the second branch port (702).

2. The air source heat pump system according to claim 1, characterized in that, A fourth control valve (604) is provided between the second diversion port (702) and the inlet of the outdoor heat exchanger (4).

3. The air source heat pump system according to claim 2, characterized in that, The air source heat pump system further includes a defrost flow path, the inlet of which is connected to the fifth branch port (705) between the first branch port (701) and the indoor heat exchanger (3), and the outlet of which is connected to the sixth branch port (706) between the outdoor heat exchanger (4) and the fourth branch port (704); a fifth control valve (605) is provided on the defrost flow path, and a sixth control valve (606) is provided between the fourth branch port (704) and the sixth branch port (706).

4. A control method for the air source heat pump system according to claim 3, characterized in that, The air source heat pump system includes an indoor first heating mode, and the control method includes a first heating method for the first heating mode, the first heating method including: controlling the first control valve (601) to open, the second control valve (602) to open, the sixth control valve (606) to open, the fourth control valve (604) to open, the third control valve (603) to close, and the fifth control valve (605) to close.

5. The control method according to claim 4, characterized in that, The air source heat pump system further includes a second heating mode, and the control method includes a second heating method for the second heating mode. The second heating method includes: controlling the first control valve (601) to open, the sixth control valve (606) to open, the second control valve (602) to close, and the fifth control valve (605) to close; and controlling the third control valve (603) to close and the fourth control valve (604) to open, or controlling the third control valve (603) to open and the fourth control valve (604) to close, or controlling the third control valve (603) to open and the fourth control valve (604) to open.

6. The control method according to claim 4, characterized in that, The air source heat pump system also includes a heat storage mode, and the control method includes a hot water method for the heat storage mode, the hot water method including: controlling the second control valve (602) to open, the fourth control valve (604) to open, the sixth control valve (606) to open, and controlling the first control valve (601) to close, the third control valve (603) to close, and the fifth control valve (605) to close.

7. The control method according to claim 4, characterized in that, The air source heat pump system also includes a defrost mode, the first throttling device (501) can be opened or closed, the control method includes a defrost method for the defrost mode, the defrost method includes: controlling the first control valve (601) to open, the third control valve (603) to open, the fourth control valve (604) to open, the fifth control valve (605) to open, controlling the second control valve (602) to close, controlling the sixth control valve (606) to close; and controlling the first throttling device (501) to open or close.

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