Heat pump and hot water defrosting system thereof

Abstract

The utility model relates to a heat pump and a hot water defrosting system thereof. A first circulating water path is formed between a water tank and a heat recovery heat exchanger of the hot water defrosting system. And a second circulating water path is formed between the air-conditioning side heat exchanger and the end equipment. The water-water heat exchanger is connected with the domestic water tank to form a third circulating water path, and the water-water heat exchanger, the air conditioner side heat exchanger and the end equipment form a fourth circulating water path. And in the non-defrosting mode, the third circulating water path and the fourth circulating water path are closed, and the first circulating water path and / or the second circulating water path are / is opened. Under the non-defrosting working condition, the water path of the air conditioner side heat exchanger does not pass through the water-water heat exchanger, and therefore unnecessary water path resistance loss can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of defrosting, in particular to a heat pump and a hot water defrosting system thereof. Background Art

[0002] Since a heat pump can obtain heat energy from a low-temperature environment, it is widely used in a low-temperature environment. Therefore, the outdoor heat exchanger of the heat pump often frosts.

[0003] In the related art, for the defrosting scheme of a combined heat and power supply with a heat recovery function, there is a method of using the heat for preparing hot water in a heat recovery heat exchanger to defrost the outdoor heat exchanger. Among them, the domestic water tank is connected to the air-conditioning side heat exchanger through a water-water heat exchanger, and the heat is transferred to the air-conditioning side heat exchanger through the water circuit. However, there is a problem that no matter in the heating mode or the defrosting mode, the water circuit of the air-conditioning side heat exchanger needs to pass through the water-water heat exchanger. Therefore, in the heating mode, the water circuit of the air-conditioning side heat exchanger passing through the water-water heat exchanger will cause unnecessary water circuit resistance loss. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a heat pump and a hot water defrosting system thereof aiming at the above defects.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a hot water defrosting system, comprising:

[0006] A domestic water tank; a first circulating water circuit is formed between the domestic water tank and the heat recovery heat exchanger;

[0007] An air-conditioning side heat exchanger, a second circulating water circuit is formed between the air-conditioning side heat exchanger and the terminal equipment;

[0008] A water-water heat exchanger, a third circulating water circuit is formed by connecting the water-water heat exchanger with the domestic water tank, and the water-water heat exchanger also forms a fourth circulating water circuit with the air-conditioning side heat exchanger and the terminal equipment;

[0009] Wherein, in the defrosting mode, the first circulating water circuit and the second circulating water circuit are closed, the third circulating water circuit and the fourth circulating water circuit are opened, the hot water in the domestic water tank circulates through the third circulating water circuit and flows through the water-water heat exchanger, and the water-water heat exchanger is used to heat the circulating water between the terminal equipment and the air-conditioning side heat exchanger through the fourth circulating water circuit and then transport it to the air-conditioning side heat exchanger and the terminal equipment;

[0010] In the non-defrosting mode, the third circulating water circuit and the fourth circulating water circuit are closed, and the first circulating water circuit and / or the second circulating water circuit are opened.

[0011] In one embodiment, the water-water heat exchanger includes a water inlet a, a water outlet b communicating with the water inlet a, a water inlet c, and a water outlet d communicating with the water inlet c;

[0012] The water inlet a and the water outlet b are connected to the domestic water tank to form a third circulation water path;

[0013] The water inlet c and the water outlet d are connected to the air-conditioning side heat exchanger and the terminal device to form a fourth circulation water path.

[0014] In one embodiment, the hot water defrosting system further includes:

[0015] A first flow path reversing device;

[0016] The air-conditioning side heat exchanger and the terminal device form a second circulation water path through the first flow path reversing device;

[0017] The water-water heat exchanger, the air-conditioning side heat exchanger, and the terminal device form a fourth circulation water path through the first flow path reversing device.

[0018] In one embodiment, the first flow path reversing device is a multi-way valve. The valve port a of the multi-way valve is connected to the terminal device and is connected to the water inlet c of the water-water heat exchanger through a first bypass pipeline. The valve port b of the multi-way valve is connected to the water outlet d of the water-water heat exchanger. The valve port c of the multi-way valve is connected to the water inlet of the air-conditioning side heat exchanger, and the water outlet of the air-conditioning side heat exchanger is connected to the terminal device;

[0019] Wherein, when the valve port a and the valve port c of the multi-way valve are communicated, the second circulation water path is opened;

[0020] When the valve port b and the valve port c of the multi-way valve are communicated, the fourth circulation water path is opened.

[0021] In one embodiment, the multi-way valve further includes a valve port d. The valve port d of the multi-way valve is connected to the pipeline between the water outlet of the air-conditioning side heat exchanger and the terminal device; when the valve port b and the valve port c of the multi-way valve are communicated, and the valve port b and the valve port d of the multi-way valve are communicated, the fourth circulation water path is opened.

[0022] In one embodiment, the first flow path switching device includes a first three-way valve and a second three-way valve. The port a of the first three-way valve is connected to the terminal device and is connected to the water input port c of the water-water heat exchanger through a first bypass pipeline. The port b of the first three-way valve is connected to the water output port d of the water-water heat exchanger. The port c of the first three-way valve is connected to the water input port of the air-conditioning side heat exchanger through the connected port a and port c of the second three-way valve. The port b of the second three-way valve is connected to the pipeline between the water output port of the air-conditioning side heat exchanger and the terminal device;

[0023] Wherein, when the port a and the port c of the first three-way valve are connected, the second circulating water path is opened;

[0024] When the port b and the port c of the first three-way valve are connected, or when the port b and the port c of the first three-way valve are connected and the port a and the port b of the second three-way valve are connected, the fourth circulating water path is opened.

[0025] In one embodiment, the hot water defrosting system further includes:

[0026] A second flow path switching device;

[0027] The domestic water tank and the heat recovery heat exchanger form a first circulating water path through the second flow path switching device;

[0028] The water-water heat exchanger and the domestic water tank form a third circulating water path through the second flow path switching device.

[0029] In one embodiment, the second flow path switching device is a third three-way valve. The port a of the third three-way valve is connected to the water output port b of the water-water heat exchanger. The port b of the third three-way valve is connected to the water output port of the heat recovery heat exchanger. The port c of the third three-way valve is connected to the water input port of the domestic water tank. The water output port of the domestic water tank is connected to the water input port of the heat recovery heat exchanger and is connected to the water input port a of the water-water heat exchanger through a second bypass pipeline;

[0030] Wherein, when the port b and the port c of the third three-way valve are connected, the first circulating water path is opened;

[0031] When the port a and the port c of the third three-way valve are connected, the third circulating water path is opened.

[0032] In one embodiment, the hot water defrosting system further includes a first water pump, which is arranged on the pipeline at the inlet end of the water-water heat exchanger and is used to drive hot water to circulate through the water-water heat exchanger; or

[0033] The air-conditioning side heat exchanger further includes a first refrigerant interface and a second refrigerant interface communicated with the first refrigerant interface; or

[0034] The water-water heat exchanger is a plate heat exchanger or a shell-and-tube heat exchanger.

[0035] In addition, the present invention also provides a heat pump system, including:

[0036] A heat recovery heat exchanger;

[0037] Terminal equipment;

[0038] An outdoor host, and the outdoor host includes the hot water defrosting system as described above.

[0039] Implementing the heat pump and its hot water defrosting system of the present invention has the following beneficial effects: In the hot water defrosting system of the present invention, a first circulating water path is formed between the domestic water tank and the heat recovery heat exchanger, a second circulating water path is formed between the air-conditioning side heat exchanger and the terminal equipment, the water-water heat exchanger is connected to the domestic water tank to form a third circulating water path, and the water-water heat exchanger is also connected to the air-conditioning side heat exchanger and the terminal equipment to form a fourth circulating water path. It can enable the water path of the air-conditioning side heat exchanger not to pass through the water-water heat exchanger under non-defrosting conditions, thereby reducing unnecessary water path resistance losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The present invention will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0041] Figure 1 is a schematic structural diagram of a hot water defrosting system according to an embodiment of the present application;

[0042] Figure 2 is a schematic diagram of a heat pump system provided by an embodiment of the present application;

[0043] Figure 3 is Figure 1 a schematic diagram of the fluid flow direction in the defrosting mode;

[0044] Figure 4 is Figure 1 a schematic diagram of the fluid flow direction in the non-defrosting mode;

[0045] Figure 5 is a schematic structural diagram of a heat pump system provided by some embodiments of the present application;

[0046] Figure 6 is Figure 5Schematic diagram of fluid flow direction in defrosting mode;

[0047] Figure 7 is Figure 5 Schematic diagram of fluid flow direction in defrosting mode.

[0048] Description of reference numerals: 11, domestic water tank; 12, water-water heat exchanger; 13, air-conditioning side heat exchanger; 14, heat recovery heat exchanger; 15, multi-way valve; 16, first three-way valve; 17, second three-way valve; 18, third three-way valve; 19, first water pump; 1, outdoor main unit; 2, terminal equipment; 3, compressor; 4, outdoor side heat exchanger; 5, four-way reversing valve; 6, first reversing valve; 7, second reversing valve; 8, third reversing valve; 20, throttling device; 21, first expansion mechanism; 23, second expansion mechanism; 22, first solenoid valve; 24, second solenoid valve. Detailed implementation manners

[0049] For a clearer understanding of the technical features, objectives and effects of the present utility model, the detailed implementation manners of the present utility model will now be described with reference to the accompanying drawings.

[0050] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present utility model. However, those skilled in the art should clearly understand that the present utility model can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits and methods are omitted to avoid unnecessary details from interfering with the description of the present utility model.

[0051] For the convenience of understanding the present utility model, the present utility model will be described more comprehensively below. The present utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present utility model more thorough and comprehensive.

[0052] It should be noted that when an element is described as "connected" to another element, it can be directly connected to the other element, or there can be one or more intermediate elements therebetween. When terms such as "vertical", "horizontal", "left", "right", "up", "down", "inside", "outside", "bottom", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to this application. It should be understood that although terms such as "first", "second", etc. may be used to limit components in the embodiments of the present utility model, it is only for the convenience of distinguishing the corresponding components. Without additional statements, the above terms have no special meaning, and thus cannot be construed as a limitation to the protection scope of this application.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this utility model belongs. The terms used in the specification of this utility model herein are only for the purpose of describing specific embodiments, and are not intended to limit this utility model.

[0054] As Figure 1 shown, an embodiment of this application discloses a hot water defrosting system, including a domestic water tank 11, an air-conditioning side heat exchanger 13, and a water-water heat exchanger 12. Specifically as follows:

[0055] A first circulating water path is formed between the domestic water tank 11 and the heat recovery heat exchanger 14.

[0056] A second circulating water path is formed between the air-conditioning side heat exchanger 13 and the terminal device 2.

[0057] The water-water heat exchanger 12 is connected to the domestic water tank 11 to form a third circulating water path, and the water-water heat exchanger 12 is also connected to the air-conditioning side heat exchanger 13 and the terminal device 2 to form a fourth circulating water path.

[0058] Wherein, in the defrosting mode, the first circulating water path and the second circulating water path are closed, the third circulating water path and the fourth circulating water path are opened, and the hot water in the domestic water tank 11 circulates through the water-water heat exchanger 12 through the third circulating water path. The water-water heat exchanger 12 is used to heat the circulating water between the air-conditioning side heat exchanger 13 and the terminal device 2 through the fourth circulating water path and then deliver it to the air-conditioning side heat exchanger 13 and the terminal device 2.

[0059] It can be understood that the water-water heat exchanger 12 can heat the return water from the terminal device 2 or the return water from the air-conditioning side heat exchanger 13 through the fourth circulation water path and then transport it to the air-conditioning side heat exchanger 13 and the terminal device 2. The specific transportation method can be either a simultaneous and separate transportation method or a sequential transportation method, etc., which is not specifically limited here. The following embodiments mainly take the return water from the terminal device 2 as an example to elaborate in detail on the working principle of the hot water defrosting system of the present application.

[0060] In the non-defrosting mode, the third circulation water path and the fourth circulation water path are closed, and the first circulation water path and / or the second circulation water path are opened.

[0061] The hot water defrosting system of this embodiment can enable the water path of the air-conditioning side heat exchanger not to pass through the water-water heat exchanger under non-defrosting conditions, thereby reducing unnecessary water path resistance losses.

[0062] Specifically, the first water pump 19 is provided on the pipeline at the inlet end of the water-water heat exchanger 12 for driving the hot water to circulate through the water-water heat exchanger 12.

[0063] The water-water heat exchanger 12 includes a water inlet a, a water outlet b communicated with the water inlet a, a water inlet c, and a water outlet d communicated with the water inlet c. The water inlet a and the water outlet b of the water-water heat exchanger 12 are connected to the domestic water tank 11 to form a third circulation water path. The water inlet c and the water outlet d of the water-water heat exchanger 12 are connected to the air-conditioning side heat exchanger 13 and the terminal device 2 to form a fourth circulation water path.

[0064] To better transfer the heat of the hot water to the circulating water between the air-conditioning side heat exchanger 13 and the terminal device 2, the water flow direction from the water inlet a of the water-water heat exchanger 12 to the water outlet b of the water-water heat exchanger 12 is opposite to the water flow direction from the water inlet c of the water-water heat exchanger 12 to the water outlet d of the water-water heat exchanger 12. That is to say, the water flow directions of the third circulation water path and the fourth circulation water path are opposite. In some other embodiments, the water flow directions of the two paths can also be the same.

[0065] The air-conditioning side heat exchanger 13 includes a water inlet 131 and a water outlet 132 communicated with the water inlet 131, and also includes a first refrigerant interface 133 and a second refrigerant interface 134 communicated with the first refrigerant interface 133.

[0066] In this embodiment, the terminal device 2 is a device provided in a space and used to regulate the temperature of the space through a water path. For example, the terminal device 2 is specifically at least one of a fan coil unit, a floor heating pipe, and a radiator. The heat pump system stores hot water in the domestic water tank through the domestic hot water preparation mode. The water-water heat exchanger 12, the air-conditioning side heat exchanger 13, and the heat recovery heat exchanger 14 are specifically plate heat exchangers or shell-and-tube heat exchangers, which are not limited here.

[0067] In some embodiments, the hot water defrosting system further includes a first flow path switching device. The air-conditioning side heat exchanger 13 and the terminal device 2 form a second circulating water path through the first flow path switching device. The water-water heat exchanger 12, the air-conditioning side heat exchanger 13 and the terminal device 2 form a fourth circulating water path through the first flow path switching device.

[0068] In an alternative embodiment, as Figures 1 to 4 shown, the first flow path switching device is a multi-way valve 15. The valve port a of the multi-way valve 15 is connected to the terminal device 2 and is connected to the water input port c of the water-water heat exchanger 12 through a first bypass pipeline. The valve port b of the multi-way valve 15 is connected to the water output port d of the water-water heat exchanger 12. The valve port c of the multi-way valve 15 is connected to the water input port 131 of the air-conditioning side heat exchanger 13. The water output port 132 of the air-conditioning side heat exchanger 13 is connected to the terminal device 2.

[0069] Among them, when the valve port a of the multi-way valve 15 and the valve port c of the multi-way valve 15 are communicated, the second circulating water path is opened. When the valve port b of the multi-way valve 15 and the valve port c of the multi-way valve 15 are communicated, the fourth circulating water path is opened.

[0070] In some embodiments, in order to be able to adjust the flow rate entering the air-conditioning side heat exchanger 13, ensure the water flow rate corresponding to the heat required for defrosting, and at the same time heat the terminal device 2 by using the domestic water tank 11, so that when defrosting, the terminal device 2 is still heating, the multi-way valve 15 may further include a valve port d. The valve port d of the multi-way valve 15 is connected to the pipeline between the water output port 132 of the air-conditioning side heat exchanger 13 and the terminal device 2.

[0071] Among them, when the valve port a of the multi-way valve 15 and the valve port c of the multi-way valve 15 are communicated, the second circulating water path is opened. When the valve port b of the multi-way valve 15 and the valve port c of the multi-way valve 15 are communicated, and the valve port b of the multi-way valve 15 and the valve port d of the multi-way valve 15 are communicated, the fourth circulating water path is opened.

[0072] In this embodiment, the multi-way valve 15 may be selected as a four-way valve. Of course, other multi-way valves can also be selected according to user needs.

[0073] In some embodiments, the hot water defrosting system further includes a second flow path switching device. The domestic water tank 11 and the heat recovery heat exchanger 14 form a first circulating water path through the second flow path switching device. The water-water heat exchanger 12 and the domestic water tank 11 form a third circulating water path through the second flow path switching device.

[0074] In an alternative embodiment, as Figure 1As shown in the figure, the second flow path switching device is the third three-way valve 18. The valve port a of the third three-way valve 18 is connected to the water outlet b of the water-water heat exchanger 12. The valve port b of the third three-way valve 18 is connected to the water outlet of the heat recovery heat exchanger 14. The valve port c of the third three-way valve 18 is connected to the water inlet of the domestic water tank 11. The water outlet of the domestic water tank 11 is connected to the water inlet of the heat recovery heat exchanger 14 and is connected to the water inlet a of the water-water heat exchanger 12 through the second bypass pipeline.

[0075] Among them, when the valve port b and the valve port c of the third three-way valve 18 are connected, the first circulating water path is opened. When the valve port a and the valve port c of the third three-way valve 18 are connected, the third circulating water path is opened.

[0076] Taking the second flow path switching device as the third three-way valve 18 as an example, the specific flow paths of the hot water defrosting system when working in the defrosting mode and the non-defrosting mode will be described below.

[0077] Figure 3 Shows Figure 1 The schematic diagram of the fluid flow direction in the defrosting mode. In the defrosting mode, the first water pump 19 is turned on, and the valve port a and the valve port c of the third three-way valve 18 are connected. At this time, the third circulating water path is opened between the domestic water tank 11 and the water-water heat exchanger 12. The valve port b and the valve port c of the multi-way valve 15 are connected, and the valve port b and the valve port d of the multi-way valve 15 are connected. At this time, the fourth circulating water path is opened between the water-water heat exchanger 12, the air-conditioning side heat exchanger 13 and the terminal device 2. The first circulating water path and the second circulating water path are closed.

[0078] Specifically, in the third circulating water path, the domestic water tank 11 flows hot water into the water-water heat exchanger 12 through the first water pump 19 and the second bypass pipeline. The return water located at the terminal device 2 exchanges the heat of the domestic water tank 11 in the water-water heat exchanger 12 through the fourth circulating water path. That is to say, the hot water in the domestic water tank 11 in the third circulating water path exchanges heat with the return water of the terminal device 2 in the fourth circulating water path in the water-water heat exchanger 12. Then, it flows through the valve port c and the valve port d respectively through the valve port b of the multi-way valve 15. The heat-exchanged return water coming out of the valve port c enters the air-conditioning side heat exchanger 13, and the heat-exchanged return water coming out of the valve port d enters the terminal device 2. Since the air-conditioning side heat exchanger 13 is refrigerating during defrosting, the heat-exchanged return water can absorb the cold of the air-conditioning side heat exchanger 13.

[0079] With the above settings, the purpose of absorbing the cold of the air-conditioning side heat exchanger 13 and heating the terminal device 2 simultaneously during defrosting can be achieved.

[0080] Further, the multi-way valve 15 can also be selected as a multi-way regulating valve capable of regulating the opening degree of the valve port, so that the flow rates of the valve ports c and d of the multi-way valve 15 can be adjusted according to the heat required by the air-conditioning side heat exchanger 13 during the defrosting process, and only the required flow rate needs to be provided to the air-conditioning side heat exchanger 13. The remaining hot water is directly connected to the terminal device 2 through the valve port d for heating, which can avoid all the hot water flowing in the air-conditioning side heat exchanger 13, thereby reducing the resistance loss caused by the long and complex pipeline inside the air-conditioning side heat exchanger 13 and improving the system operation energy efficiency.

[0081] In this embodiment, by adjusting the flow rate entering the air-conditioning side heat exchanger 13 through the multi-way valve 15, only the water flow rate corresponding to the heat required for defrosting needs to be ensured. It can not only heat the terminal device 2 by using the domestic water tank 11 at the same time, so that when defrosting occurs, the terminal device 2 is still heating, thus improving the user experience, but also further reduce the pipeline pressure loss passing through the air-conditioning side heat exchanger 13, achieving the purpose of saving the total waterway energy consumption and the effect of energy conservation.

[0082] Figure 4 shows Figure 1 A schematic diagram of the fluid flow direction in the non-defrosting mode. In the non-defrosting mode, that is, when the heat pump system is operating normally (including the heating mode, the domestic hot water preparation mode, etc.), for example, when heating indoors in winter, the first circulation waterway and / or the second circulation waterway are opened, and the third circulation waterway and the fourth circulation waterway are closed. When the heat pump system operates in the non-defrosting mode, the return water of the terminal device 2 does not pass through the water-water heat exchanger at all. Thereby, unnecessary waterway resistance loss can be reduced.

[0083] In the domestic hot water preparation mode, the valve port b of the third three-way valve 18 is communicated with the valve port c, and the valve port a of the third three-way valve 18 is closed. At this time, the first circulation waterway is opened, and the second circulation waterway, the third circulation waterway and the fourth circulation waterway are closed. Specifically, the water in the domestic water tank 11 exchanges the heat carried by the refrigerant in the refrigerant pipeline of the heat recovery heat exchanger 14 through the first circulation waterway formed by connecting the valve port b and the valve port c of the third three-way valve 18 through the first water pump 19, and reciprocates, thereby realizing the preparation of domestic hot water. At the same time, the return water of the terminal device 2 does not pass through the water-water heat exchanger at all, and the effect of reducing unnecessary waterway resistance loss can be achieved.

[0084] In the heating mode, the valve port a of the multi-way valve 15 is communicated with the valve port c of the multi-way valve 15, and the valve ports b and d of the multi-way valve 15 are closed. At this time, the second circulation water path is opened, and the first, third, and fourth circulation water paths are closed. Specifically, the return water of the terminal device 2 replaces the heat carried by the refrigerant in the refrigerant pipeline of the air-conditioning side heat exchanger 13 through the second circulation water path. That is, the heat pump system prepares hot water through the air-conditioning side heat exchanger 13 (heating the return water of the terminal device 2 by heat exchange with the refrigerant), and circulates reciprocally, thereby realizing indoor heating. At the same time, the return water of the terminal device 2 does not pass through the water-water heat exchanger at all, achieving the effect of reducing unnecessary water path resistance loss.

[0085] In the heating and domestic hot water preparation mode, the valve port b of the third three-way valve 18 is communicated with the valve port c, the valve port a of the third three-way valve 18 is closed, and the valve port a of the multi-way valve 15 is communicated with the valve port c of the multi-way valve 15, and the valve ports b and d of the multi-way valve 15 are closed. At this time, the first and second circulation water paths are opened, and the third and fourth circulation water paths are closed.

[0086] Specifically, the water in the domestic water tank 11 replaces the heat carried by the refrigerant in the refrigerant pipeline of the heat recovery heat exchanger 14 through the first circulation water path formed by the connection of the first water pump 19 with the valve port b and the valve port c of the third three-way valve 18, and circulates reciprocally. Moreover, the return water of the terminal device 2 replaces the heat carried by the refrigerant in the refrigerant pipeline of the air-conditioning side heat exchanger 13 through the second circulation water path, and circulates reciprocally. Thereby realizing the preparation of domestic hot water and indoor heating. At the same time, the return water of the terminal device 2 does not pass through the water-water heat exchanger at all, achieving the effect of reducing unnecessary water path resistance loss.

[0087] In an alternative embodiment, as Figures 5 to 7 shown, the first flow path reversing device includes a first three-way valve 16 and a second three-way valve 17. The valve port a of the first three-way valve 16 is connected to the terminal device 2 and is connected to the water input port c of the water-water heat exchanger 12 through a first bypass pipeline. The valve port b of the first three-way valve 16 is connected to the water output port d of the water-water heat exchanger 12. The valve port c of the first three-way valve 16 is connected to the water input port 131 of the air-conditioning side heat exchanger 13 through the connected valve port a and the valve port c of the second three-way valve 17. The valve port b of the second three-way valve 17 is connected to the pipeline between the water output port 132 of the air-conditioning side heat exchanger 13 and the terminal device 2.

[0088] As Figure 6 shown, it shows Figure 5 the fluid flow diagram in the defrosting mode. When the valve port b and the valve port c of the first three-way valve 16 are communicated, or when the valve port b and the valve port c of the first three-way valve 16 are communicated and the valve port a and the valve port b of the second three-way valve 17 are communicated, the fourth circulation water path is opened.

[0089] In this embodiment, the flow rate of the water entering the air-conditioning side heat exchanger 13 is adjusted by the second three-way valve 17. Only the water flow rate corresponding to the heat required for defrosting needs to be ensured. In this way, while the terminal device 2 can be heated by using the domestic water tank 11 at the same time, when defrosting occurs, the terminal device 2 is still in the heating state, thus improving the user experience. Moreover, the pressure loss of the pipeline passing through the air-conditioning side heat exchanger 13 can be further reduced, achieving the purpose of saving the total waterway energy consumption and the effect of energy conservation.

[0090] As Figure 7 shown, Figure 5 the fluid flow diagram in the non-defrost mode is shown. It can be seen from the figure that when the valve port a of the first three-way valve 16 is communicated with the valve port c of the first three-way valve 16, the second circulation waterway is opened. It should be noted that the specific flow description of the fluid in different non-defrost modes can refer to the embodiment of the multi-way valve 15 above, and will not be elaborated here.

[0091] The hot water defrosting system of this embodiment can enable the waterway of the air-conditioning side heat exchanger not to pass through the water-water heat exchanger under non-defrosting conditions, thereby reducing unnecessary waterway resistance loss.

[0092] As Figure 2 shown, an embodiment of the present application discloses a heat pump system, including a heat recovery heat exchanger 14, a terminal device 2 and an outdoor host 1, specifically as follows:

[0093] The outdoor host 1 includes the hot water defrosting system of the above embodiment. A first circulation waterway is formed between the domestic water tank 11 and the heat recovery heat exchanger 14. A second circulation waterway is formed between the air-conditioning side heat exchanger 13 and the terminal device 2. A third circulation waterway is formed by connecting the water-water heat exchanger 12 with the domestic water tank 11, and the water-water heat exchanger 12 also forms a fourth circulation waterway with the air-conditioning side heat exchanger 13 and the terminal device 2. Among them, in the defrost mode, the first circulation waterway and the second circulation waterway are closed, and the third circulation waterway and the fourth circulation waterway are opened. The hot water in the domestic water tank 11 circulates through the water-water heat exchanger 12 through the third circulation waterway. The water-water heat exchanger 12 is used to heat the circulating water between the terminal device 2 and the air-conditioning side heat exchanger 13 through the fourth circulation waterway and then transport it to the air-conditioning side heat exchanger 13 and the terminal device 2. In the non-defrost mode, the third circulation waterway and the fourth circulation waterway are closed, and the first circulation waterway and / or the second circulation waterway are opened.

[0094] As Figure 2As shown, the outdoor main unit 1 further includes a compressor 3, an outdoor heat exchanger 4, a four-way reversing valve 5, a first reversing valve 6, a second reversing valve 7, a third reversing valve 8, and a throttling device 20 (including a first expansion mechanism 21, a second expansion mechanism 23, a first solenoid valve 22, and a second solenoid valve 24). In the heating mode, the high-temperature refrigerant output by the compressor 3 is reversed by the four-way reversing valve 6 and enters the air-conditioning side heat exchanger 13 from the second refrigerant interface 133 to release heat. At this time, the refrigerant exchanges heat with the circulating water (return water) in the terminal device 2 in the air-conditioning side heat exchanger 13 and circulates reciprocally to heat the terminal device 2. Then, the refrigerant after releasing heat flows out from the second refrigerant interface 134, passes through the throttling device 20, and enters the outdoor heat exchanger 4 to absorb heat. Finally, the refrigerant after absorbing heat is reversed by the four-way reversing valve 5 and returns to the inlet of the compressor 3 to complete heating.

[0095] When the outdoor temperature is relatively low, the outdoor heat exchanger 4 is prone to frosting. Therefore, it is necessary to switch to the defrosting mode, that is, adjust the four-way reversing valve 5 to change the refrigerant flow direction when the indoor is in the cooling state. The high-temperature refrigerant output by the compressor 3 enters the outdoor heat exchanger 4 after being reversed by the four-way reversing valve 5. The outdoor heat exchanger 4 releases heat to defrost. Then, the refrigerant after releasing heat passes through the throttling device 20 and enters the air-conditioning side heat exchanger 13 to absorb heat. At this time, it is necessary to rely on the heat exchange between the air-conditioning side heat exchanger 13 and warm water. Finally, the refrigerant after absorbing heat is reversed by the four-way reversing valve 5 and returns to the inlet of the compressor 3 to complete defrosting.

[0096] In this embodiment, a water-water heat exchanger 12 is added between the domestic water tank 11 and the air-conditioning side heat exchanger 13. The air-conditioning side heat exchanger 13 is connected to the terminal device 2 and the water-water heat exchanger 12 through a first flow path reversing device, and the water-water heat exchanger 12 is connected to the terminal device 2 through a first flow path reversing device, so that a second circulation water path and a fourth circulation water path can be formed. The domestic water tank 11 is connected to the water-water heat exchanger 12 and the heat recovery heat exchanger 14 through a second flow path reversing device, so that a first circulation water path and a third circulation water path can be formed.

[0097] During the defrosting process, the heat of the hot water in the domestic water tank 11 is transferred to the terminal device 2 and the air-conditioning side heat exchanger 13 through the water-water heat exchanger 12, solving the problems of indoor side cooling and the inability to discharge the cold quantity of the air-conditioning side heat exchanger 13 during defrosting, delivering heat to the outdoor heat exchanger and simultaneously heating the terminal device.

[0098] During the heating and / or domestic hot water preparation process, the return water of the terminal device 2 exchanges heat in the air-conditioning side heat exchanger 13 through the second circulation water path, so that it can completely bypass the water-water heat exchanger. Similarly, the water in the domestic water tank 11 exchanges heat in the heat recovery heat exchanger 14 through the first circulation water path, so that it can completely bypass the water-water heat exchanger.

[0099] This embodiment enables the water circuit of the air-conditioning side heat exchanger not to pass through the water-water heat exchanger under non-defrosting conditions of the heat pump system, thereby reducing unnecessary water circuit resistance losses.

[0100] In some embodiments, the heat pump system may further include a second water pump (not shown), which is disposed on the pipeline between the water input port c of the terminal device 2 and the water-water heat exchanger 12, and is used to drive the return water of the terminal device 2 to quickly flow through the water-water heat exchanger 12.

[0101] It can be understood that the above embodiments only express the preferred embodiments of the present invention, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent of the present invention; it should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can also be made, which all belong to the protection scope of the present invention; therefore, all equivalent transformations and modifications made to the scope of the claims of the present invention shall fall within the scope covered by the claims of the present invention.

Claims

1. A hot water defrosting system, characterized in that: include: A domestic water tank (11); a first circulating water path is formed between the domestic water tank (11) and the heat recovery heat exchanger (14); An air-conditioning side heat exchanger (13), wherein a second circulating water circuit is formed between the air-conditioning side heat exchanger (13) and the terminal device (2); A water-to-water heat exchanger (12), wherein the water-to-water heat exchanger (12) is connected to the domestic water tank (11) to form a third circulating water circuit, and the water-to-water heat exchanger (12) is also connected to the air-conditioning side heat exchanger (13) and the terminal device (2) to form a fourth circulating water circuit; Wherein, in the defrost mode, the first circulation water circuit and the second circulation water circuit are closed, the third circulation water circuit and the fourth circulation water circuit are opened, and the hot water in the domestic water tank (11) circulates through the third circulation water circuit and flows through the water-to-water heat exchanger (12), and the water-to-water heat exchanger (12) is used to heat the circulating water between the terminal device (2) and the air-conditioning side heat exchanger (13) through the fourth circulation water circuit and then transport it to the air-conditioning side heat exchanger (13) and the terminal device (2); In the non-defrosting mode, the third circulation water circuit and the fourth circulation water circuit are closed, and the first circulation water circuit and / or the second circulation water circuit are opened.

2. The hot water defrosting system according to claim 1, characterized in that: The water-to-water heat exchanger (12) comprises a water input port a, a water output port b connected to the water input port a, a water input port c, and a water output port d connected to the water input port c; The water input port a and the water output port b are connected to the domestic water tank (11) to form a third circulating water circuit; The water input port c and the water output port d are connected to the air-conditioning side heat exchanger (13) and the terminal device (2) to form a fourth circulating water circuit.

3. The hot water defrosting system according to any one of claims 1 or 2, characterized in that: The hot water defrosting system also includes: a first flow path reversing device; The air-conditioning side heat exchanger (13) and the terminal device (2) form a second circulating water path through the first flow path reversing device; The water-to-water heat exchanger (12), the air-conditioning side heat exchanger (13) and the terminal device (2) form a fourth circulating water path through the first flow path reversing device.

4. The hot water defrosting system according to claim 3, characterized in that: The first flow path reversing device is a multi-way valve (15), the valve port a of the multi-way valve (15) is connected to the terminal device (2) and is connected to the water input port c of the water-to-water heat exchanger (12) through a first bypass pipeline, the valve port b of the multi-way valve (15) is connected to the water output port d of the water-to-water heat exchanger (12), the valve port c of the multi-way valve (15) is connected to the water input port (131) of the air-conditioning side heat exchanger (13), and the water output port (132) of the air-conditioning side heat exchanger (13) is connected to the terminal device (2); Wherein, when the valve port a of the multi-way valve (15) is connected to the valve port c of the multi-way valve (15), the second circulating water circuit is opened; When the valve port b of the multi-way valve (15) is connected to the valve port c of the multi-way valve (15), the fourth circulating water path is opened.

5. The hot water defrosting system according to claim 4, characterized in that: The multi-way valve (15) further comprises a valve port d, wherein the valve port d of the multi-way valve (15) is connected to the pipeline between the water outlet (132) of the air-conditioning side heat exchanger (13) and the terminal device (2); the valve port b of the multi-way valve (15) is connected to the valve port c of the multi-way valve (15), and when the valve port b of the multi-way valve (15) is connected to the valve port d of the multi-way valve (15), the fourth circulating water circuit is opened.

6. The hot water defrosting system according to claim 3, characterized in that: The first flow path reversing device comprises a first three-way valve (16) and a second three-way valve (17); a valve port a of the first three-way valve (16) is connected to the terminal device (2) and is connected to the water input port c of the water-to-water heat exchanger (12) through a first bypass pipeline; a valve port b of the first three-way valve (16) is connected to the water output port d of the water-to-water heat exchanger (12); a valve port c of the first three-way valve (16) is connected to the water input port (131) of the air-conditioning side heat exchanger (13) through the valve port a of the second three-way valve (17) and the valve port c of the second three-way valve (17) which are connected; and a valve port b of the second three-way valve (17) is connected to the pipeline between the water output port (132) of the air-conditioning side heat exchanger (13) and the terminal device (2); Wherein, when the valve port a of the first three-way valve (16) is connected to the valve port c of the first three-way valve (16), the second circulating water circuit is opened; When the valve port b of the first three-way valve (16) is connected to the valve port c of the first three-way valve (16), or when the valve port b of the first three-way valve (16) is connected to the valve port c of the first three-way valve (16), and the valve port a of the second three-way valve (17) is connected to the valve port b of the second three-way valve (17), the fourth circulating water circuit is opened.

7. The hot water defrosting system according to any one of claims 1 or 2, characterized in that: The hot water defrosting system also includes: a second flow path reversing device; The domestic water tank (11) and the heat recovery heat exchanger (14) form a first circulating water path through the second flow path reversing device; The water-to-water heat exchanger (12) and the domestic water tank (11) form a third circulating water circuit via the second flow path reversing device.

8. The hot water defrosting system according to claim 7, characterized in that: The second flow path reversing device is a third three-way valve (18), the valve port a of the third three-way valve (18) is connected to the water output port b of the water-to-water heat exchanger (12), the valve port b of the third three-way valve (18) is connected to the water output port of the heat recovery heat exchanger (14), the valve port c of the third three-way valve (18) is connected to the water input port of the domestic water tank (11), the water output port of the domestic water tank (11) is connected to the water input port of the heat recovery heat exchanger (14) and is connected to the water input port a of the water-to-water heat exchanger (12) via a second bypass pipeline; Wherein, when the valve port b of the third three-way valve (18) is connected to the valve port c of the third three-way valve (18), the first circulating water path is opened; When the valve port a of the third three-way valve (18) is connected to the valve port c of the third three-way valve (18), the third circulating water path is opened.

9. The hot water defrosting system according to any one of claims 1 to 2, 4 to 6 and 8, characterized in that: The hot water defrosting system further comprises a first water pump (19), the first water pump (19) being arranged on a pipeline at an inlet end of the water-to-water heat exchanger (12) and being used for driving hot water to circulate through the water-to-water heat exchanger (12); or The air-conditioning side heat exchanger (13) further comprises a first refrigerant interface (133) and a second refrigerant interface (134) connected to the first refrigerant interface (133); or The water-to-water heat exchanger (12) is a plate heat exchanger or a shell-and-tube heat exchanger.

10. A heat pump system, characterized in that: include: heat recovery heat exchanger (14); Terminal equipment (2); An outdoor host (1), wherein the outdoor host (1) comprises the hot water defrosting system according to any one of claims 1 to 9.

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