Heat exchange system

Abstract

The utility model discloses a heat exchange system which comprises a compressor, a first heat exchanger and a second heat exchanger, the first heat exchanger and the second heat exchanger are both arranged in a water tank, the first heat exchanger is located above the second heat exchanger, and the heat exchange system further comprises a refrigerant branch comprising a first branch and a second branch, a first pipe orifice of the first heat exchanger is connected with an exhaust port of the compressor through a first branch, and a second pipe orifice of the second heat exchanger is connected with the exhaust port of the compressor through a second branch; and the valve assembly is arranged on the refrigerant branch, and the valve assembly is used for conducting the first branch and cutting off the second branch under the quick heating working condition. In the embodiment, only a small amount of hot water on the upper portion of the water tank can be heated, the heating time of the water tank is shortened, and rapid heating is achieved.

Description

Technical Field

[0001] The present application relates to the field of heat exchange technology, and in particular to a heat exchange system. Background Art

[0002] Heat pump water heaters are an efficient and environmentally friendly hot water supply device, and their application status is growing. Heat pump water heaters heat water by using the heat energy in the air, water or soil to raise low-temperature heat energy to high temperature. Compared with traditional gas water heaters or electric water heaters, heat pump water heaters have higher energy efficiency and lower operating costs, while reducing pollution to the environment.

[0003] Heat pump water heaters generally have their own water tanks for storing hot water at a certain temperature. The capacity of the water tank varies according to the application scenario. For home use, the capacity of the water tank is generally between 100L and 300L. When a common heat pump water heater heats the hot water in the water tank, all the water in the water tank will heat up at the same time until the entire tank of water is heated to the set temperature. As the user consumes the hot water in the water tank, when it is consumed to a certain extent during the use of hot water, the heat pump unit will heat the water in the water tank again. Although there is still a certain amount of hot water in the water tank at this time, if the user continues to consume hot water, the water tank will run out of hot water. Therefore, in this case, if the user wants to continue using hot water, he must face the situation of waiting for the heat pump unit to heat the water in the water tank to the set temperature. As a result, the user will have to wait a long time for the hot water to return to the set temperature, which is an extremely bad experience for the user. Utility Model Content

[0004] This embodiment provides a heat exchange system. The embodiment of the present application can heat only a small amount of hot water in the upper part of the water tank, thereby achieving rapid heating of the water in the water tank.

[0005] In a first aspect, an embodiment of the present application provides a heat exchange system, comprising a compressor, a first heat exchanger and a second heat exchanger, wherein the first heat exchanger and the second heat exchanger are both arranged in a water tank, and the first heat exchanger is located above the second heat exchanger, and the heat exchange system further comprises:

[0006] A refrigerant branch, comprising a first branch and a second branch, wherein the first pipe port of the first heat exchanger is connected to the exhaust port of the compressor through the first branch, and the second pipe port of the second heat exchanger is connected to the exhaust port of the compressor through the second branch;

[0007] A valve assembly is arranged on the refrigerant branch, and the valve assembly is used to conduct the first branch and cut off the second branch under rapid heating conditions.

[0008] In some embodiments, the valve assembly includes a first switching valve and a second switching valve, the first switching valve is arranged on the first branch, the second switching valve is arranged on the second branch, the first port of the first switching valve is connected to the exhaust port of the compressor, the second port of the first switching valve is connected to the third pipe port of the first heat exchanger and the fourth pipe port of the second heat exchanger, the third port of the first switching valve is connected to the air inlet of the compressor, the fourth port of the first switching valve is connected to the first pipe port of the first heat exchanger, the first port of the second switching valve is connected to the exhaust port of the compressor, the second port of the second switching valve is connected to the second pipe port of the second heat exchanger, and the third port of the second switching valve is connected to the air inlet of the compressor.

[0009] In some embodiments, the valve assembly includes a first switching valve, a first valve and a second valve, the first switching valve is arranged on the first branch, the first valve is arranged on the second branch, the first port of the first switching valve is connected to the exhaust port of the compressor, the second port of the first switching valve is connected to the third pipe port of the first heat exchanger and the fourth pipe port of the second heat exchanger, the third port of the first switching valve is connected to the second pipe port of the second heat exchanger, the fourth port of the first switching valve is connected to the first pipe port of the first heat exchanger, the first end of the first valve is connected to the third pipe port of the first heat exchanger, the second end of the first valve is connected to the second pipe port of the second heat exchanger, and the second valve is arranged in the pipeline between the air inlet of the compressor and the second pipe port of the second heat exchanger.

[0010] In some embodiments, the valve assembly includes a first switching valve and a second switching valve, the first switching valve is arranged in the first branch, the second switching valve is arranged at the connection between the first branch and the second branch, the first port of the first switching valve is connected to the exhaust port of the compressor, the second port of the first switching valve is connected to the third pipe port of the first heat exchanger and the fourth pipe port of the second heat exchanger, the third port of the first switching valve is connected to the air inlet of the compressor, the fourth port of the first switching valve is connected to the first pipe port of the first heat exchanger, the first port of the second switching valve is connected to the third pipe port of the first heat exchanger, the second port of the second switching valve is connected to the second pipe port of the second heat exchanger, and the third port of the second switching valve is connected to the second port of the first switching valve.

[0011] In some embodiments, the valve assembly includes a first switching valve and a second switching valve, the first switching valve is arranged in the first branch, the second switching valve is arranged at the connection between the first branch and the second branch, the first port of the first switching valve is connected to the exhaust port of the compressor, the second port of the first switching valve is connected to the third pipe port of the first heat exchanger, the third port of the first switching valve is connected to the air inlet of the compressor, the fourth port of the first switching valve is connected to the first pipe port of the first heat exchanger, the first end of the second switching valve is connected to the fourth port of the first switching valve, the second end of the second switching valve is connected to the second pipe port of the second heat exchanger, and the third end of the second switching valve is connected to the first pipe port of the first heat exchanger.

[0012] In some embodiments, the current loop communication circuit is connected to the AC input terminal of the second switching power supply of the indoor main control board through the L line and the N line on the indoor side.

[0013] In some embodiments, the valve assembly is further used to cut off the first branch and conduct the second branch under full heat conditions.

[0014] In some embodiments, the heat exchange system further includes an evaporator, an input end of the evaporator is connected to the third pipe port of the first heat exchanger and the fourth pipe port of the second heat exchanger, and an output end of the evaporator is connected to the second port of the first switching valve.

[0015] In some embodiments, the heat exchange system also includes a first throttling component and a second throttling component, the first throttling component is arranged between the third pipe port of the first heat exchanger and the input end of the evaporator, and the second throttling component is arranged between the fourth pipe port of the second heat exchanger and the pipe formed by the first heat exchanger and the evaporator.

[0016] In some embodiments, the first switching valve is a four-way switching valve.

[0017] The heat exchange system of this embodiment has at least the following beneficial effects: the heat exchange system of the embodiment of the present application includes a compressor, a first heat exchanger and a second heat exchanger, the first heat exchanger and the second heat exchanger are both arranged in a water tank, and the first heat exchanger is located above the second heat exchanger. In addition, the heat exchange system also includes a refrigerant branch and a valve assembly, the refrigerant branch includes a first branch and a second branch, the first pipe mouth of the first heat exchanger is connected to the exhaust port of the compressor through the first branch, so that the refrigerant output by the compressor can flow into the first heat exchanger through the first branch to achieve heating of the water body above the water tank, and the second pipe mouth of the second heat exchanger is connected to the exhaust port of the compressor through the second branch, so that the refrigerant output by the compressor can flow into the second heat exchanger through the second branch to achieve heating of the water body below the water tank. The valve assembly is arranged on the refrigerant branch, and the valve assembly is used to conduct the first branch under the rapid heating condition and cut off the second branch. At this time, all the refrigerant output by the compressor flows into the first heat exchanger to achieve heating of the water body above the water tank without heating all the water in the water tank, which can shorten the heating time and achieve rapid heating of the water body in the water tank. The embodiment of the present application can heat only part of the water in the water tank through the setting relationship of the refrigerant branch and the valve assembly, without heating all the water in the water tank, thereby further shortening the heating time of the water in the water tank and achieving rapid heating of the water in the water tank.

[0018] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained through the structures particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of a heat exchange system provided in one embodiment of the present application;

[0020] Figure 2 A schematic diagram of the structure of a heat exchange system provided in another embodiment of the present application;

[0021] Figure 3 A schematic diagram of the structure of a heat exchange system provided in another embodiment of the present application;

[0022] Figure 4 A schematic diagram of the structure of a heat exchange system provided in another embodiment of the present application;

[0023] Figure 5 A schematic diagram of the structure of a heat exchange system provided in another embodiment of the present application;

[0024] Figure 6 A schematic structural diagram of a heat exchange system provided in another embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. In addition, the characteristics, operations or features described in the specification can be combined in any appropriate manner to form various implementation methods.

[0026] In the description of this application, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0027] The serial numbers of the components in this document, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0028] Heat pump water heaters are an efficient and environmentally friendly hot water supply device, and their application status is growing. Heat pump water heaters heat water by using the heat energy in the air, water or soil to raise low-temperature heat energy to high temperature. Compared with traditional gas water heaters or electric water heaters, heat pump water heaters have higher energy efficiency and lower operating costs, while reducing pollution to the environment.

[0029] Heat pump water heaters generally have their own water tanks for storing hot water at a certain temperature. The capacity of the water tank varies according to the application scenario. For home use, the capacity of the water tank is generally between 100L and 300L. When a common heat pump water heater heats the hot water in the water tank, all the water in the water tank will heat up at the same time until the entire tank of water is heated to the set temperature. As the user consumes the hot water in the water tank, when it is consumed to a certain extent during the use of hot water, the heat pump unit will heat the water in the water tank again. Although there is still a certain amount of hot water in the water tank at this time, if the user continues to consume hot water, the water tank will run out of hot water. Therefore, in this case, if the user wants to continue using hot water, he must face the situation of waiting for the heat pump unit to heat the water in the water tank to the set temperature. As a result, the user will have to wait a long time for the hot water to return to the set temperature, which is an extremely bad experience for the user.

[0030] Based on this, the present embodiment provides a heat exchange system, the heat exchange system of the present application embodiment includes a compressor, a first heat exchanger and a second heat exchanger, the first heat exchanger and the second heat exchanger are both arranged in a water tank, and the first heat exchanger is located above the second heat exchanger, in addition, the heat exchange system also includes a refrigerant branch and a valve assembly, the refrigerant branch includes a first branch and a second branch, the first pipe mouth of the first heat exchanger is connected to the exhaust port of the compressor through the first branch, so that the refrigerant output by the compressor can flow into the first heat exchanger through the first branch, so as to achieve heating of the water body above the water tank, the second pipe mouth of the second heat exchanger is connected to the exhaust port of the compressor through the second branch, so that the refrigerant output by the compressor can flow into the second heat exchanger through the second branch, so as to achieve heating of the water body below the water tank. The valve assembly is arranged on the refrigerant branch, and the valve assembly is used to conduct the first branch under the rapid heating condition and cut off the second branch, at which time all the refrigerant output by the compressor flows into the first heat exchanger, so as to achieve heating of the water body above the water tank without heating all the water body in the water tank, which can shorten the heating time and achieve rapid heating of the water body in the water tank. The embodiment of the present application can heat only part of the water in the water tank through the setting relationship of the refrigerant branch and the valve assembly, without heating all the water in the water tank, thereby further shortening the heating time of the water in the water tank and achieving rapid heating of the water in the water tank.

[0031] Reference Figure 1 As shown, Figure 1 A schematic diagram of the structure of a heat exchange system provided in one embodiment of the present application.

[0032] The heat exchange system of the embodiment of the present application includes a compressor 100 , a first heat exchanger 210 , and a second heat exchanger 220 . The first heat exchanger 210 and the second heat exchanger 220 are both disposed in a water tank 200 , and the first heat exchanger 210 is located above the second heat exchanger 220 .

[0033] In some embodiments, the heat exchange system includes a refrigerant branch and a valve assembly, the refrigerant branch includes a first branch and a second branch, the first pipe port of the first heat exchanger 210 is connected to the exhaust port of the compressor 100 through the first branch, and the second pipe port of the second heat exchanger 220 is connected to the exhaust port of the compressor 100 through the second branch, that is, the refrigerant output by the compressor 100 can flow into the first heat exchanger 210 through the first branch to achieve heating of the water body above the water tank 200, and at the same time, the refrigerant output by the compressor 100 can flow into the second heat exchanger 220 through the second branch to achieve heating of the water body below the water tank 200. The valve assembly is arranged on the refrigerant branch, and the valve assembly is used to conduct the first branch and cut off the second branch under the rapid heating condition. Since the valve assembly cuts off the second branch, the refrigerant output by the compressor 100 at this time flows into the first heat exchanger 210 through the first branch to achieve heating above the water tank 200, and there is no need to heat all the water in the water tank 200, which shortens the time required for heating.

[0034] It can be understood that the compressor 100 in the embodiment of the present application can be a variable frequency compressor 100, and the variable frequency compressor 100 can improve the heating capacity of the heat exchange system.

[0035] In some embodiments, reference Figure 1 The valve assembly includes a first switching valve 410 and a second switching valve 420. The first switching valve 410 is arranged in the first branch, and the second switching valve 420 is arranged in the second branch. The first port ( Figure 1 The D port in the figure) is connected to the exhaust port of the compressor 100, and the second port ( Figure 1 The E port in the first heat exchanger 210 is connected to the third port of the first heat exchanger 210 and the fourth port of the second heat exchanger 220, and the third port of the first switching valve 410 ( Figure 1 The S port in the first switching valve 410 is connected to the air inlet of the compressor 100, and the fourth port ( Figure 1 The first port (C port in the figure) of the second switching valve 420 is connected to the first pipe port of the first heat exchanger 210. Figure 1 The D port in the figure) is connected to the exhaust port of the compressor 100, and the second port ( Figure 1 The E port in the figure) is connected to the second pipe port of the second heat exchanger 220, and the third port ( Figure 1 The S port in the compressor is connected to the air inlet of the compressor 100.

[0036] It is worth noting that the first switching valve 410 in the embodiment of the present application is a four-way switching valve, and the second switching valve 420 is a three-way switching valve.

[0037] based on Figure 1 The structure of the heat exchange system is described below. The flow direction of the refrigerant in the valve assembly under rapid heating conditions is described in detail.

[0038] The valve assembly conducts the first branch and cuts off the second branch under the rapid heating condition. At this time, the second switching valve 420 in the valve assembly switches the E port and the S port. When the valve assembly conducts the first branch, the refrigerant flows out from the exhaust port of the compressor 100, flows in through the first port of the first switching valve 410, and flows into the first pipe port of the first heat exchanger 210 through the fourth port of the first switching valve 410. The first heat exchanger 210 releases part of the heat of the refrigerant on the water tank 200 and condenses it into liquid refrigerant. The liquid refrigerant flows from the third pipe port of the first heat exchanger 210 to the second port of the first switching valve 410, and then flows into the air inlet of the compressor 100 from the third port of the first switching valve 410, that is, a circulation loop of the exhaust port of the compressor 100-the D port and the C port of the first switching valve 410-the first heat exchanger 210-the E port and the S port of the first switching valve 410-the air inlet of the compressor 100 is formed, so as to heat the water body on the upper part of the water tank 200. At this time, the valve assembly cuts off the second branch, that is, the refrigerant cannot flow into the second branch through the second switching valve 420. At this time, the refrigerant in the second heat exchanger 220 will be completely extracted to participate in the circulation flow. Specifically, the second switching valve 420 in the valve assembly in the embodiment of the present application switches the E port and the S port. At this time, the refrigerant flows into the air inlet of the compressor 100 through the E port and the S port of the second switching valve 420.

[0039] In some embodiments, the valve assembly is also used to connect the first branch and the second branch under full heating conditions. At this time, the refrigerant flowing out of the exhaust port of the compressor 100 flows into the first heat exchanger 210 through the first branch, and flows into the second heat exchanger 220 through the second branch, thereby heating the upper and lower water bodies of the water tank 200, that is, heating the entire water tank 200.

[0040] Specifically, Figure 1 Based on the structure, under the whole heating condition, the valve assembly conducts the first branch and the second branch, at this time, the second switching valve 420 switches the first port and the second port, that is, Figure 1The refrigerant flows out from the exhaust port of the compressor 100, flows in through the first port of the first switching valve 410, and flows into the first pipe port of the first heat exchanger 210 through the fourth port of the first switching valve 410. The first heat exchanger 210 releases part of the heat of the refrigerant on the water tank 200 and condenses it into liquid refrigerant. The liquid refrigerant flows from the third pipe port of the first heat exchanger 210 to the second port of the first switching valve 410, and then flows into the air inlet of the compressor 100 from the third port of the first switching valve 410, that is, a circulation loop of the exhaust port of the compressor 100 - the D port and the C port of the first switching valve 410 - the first heat exchanger 210 - the E port and the S port of the first switching valve 410 - the air inlet of the compressor 100 is formed, thereby heating the water body on the upper part of the water tank 200. At this time, the valve assembly conducts the second branch, and the refrigerant flows out from the exhaust port of the compressor 100, flows in through the first port of the second switching valve 420, and flows into the second pipe port of the second switching valve 420 through the second port of the first switching valve 410. The second heat exchanger 220 releases heat from the refrigerant in the lower part of the water tank 200 and condenses it into liquid refrigerant. The liquid refrigerant flows from the fourth pipe port of the second heat exchanger 220 to the second port of the first switching valve 410, and then flows into the air inlet of the compressor 100 from the third port of the first switching valve 410, thus forming a circulation loop of the exhaust port of the compressor 100 - the D port and the E port of the second switching valve 420 - the second heat exchanger 220 - the E port and the S port of the first switching valve 410 - the air inlet of the compressor 100, thereby heating the water in the lower part of the water tank 200.

[0041] It is worth noting that the embodiment of the present application adds a rapid heating mode in the conventional heat exchange system, so that the heat exchange system can not only heat the whole tank of hot water, but also heat part of the hot water in the water tank 200, thereby meeting a variety of usage scenarios.

[0042] In some embodiments, Figure 1 The area of ​​the first heat exchanger 210 is larger than that of the second heat exchanger 220. Under rapid heating conditions, the first heat exchanger 210 works alone. Since the area of ​​the first heat exchanger 210 is larger than that of the second heat exchanger 220, the exhaust pressure can be reduced. By avoiding excessive exhaust pressure, system failures caused by excessive pressure are further avoided, thereby improving the stability of the heat exchange system.

[0043] In some embodiments, the heat exchange system also includes an evaporator 500, the input end of the evaporator 500 is connected to the third pipe port of the first heat exchanger 210 and the fourth pipe port of the second heat exchanger 220, and the output end of the evaporator 500 is connected to the second port of the first switching valve 410, so as to absorb the heat of the refrigerant flowing out of the first heat exchanger 210 and / or the second heat exchanger 220, thereby improving the thermal stability of the heat exchange system and reducing temperature fluctuations.

[0044] In some embodiments, the heat exchange system also includes a first throttling component 610 and a second throttling component 620. The first throttling component 610 is arranged between the third pipe port of the first heat exchanger 210 and the input end of the evaporator 500, so as to control the refrigerant flow rate flowing out of the first heat exchanger 210, reduce the pressure of the refrigerant, and provide a low-pressure refrigerant environment for the evaporator 500. The second throttling component 620 is arranged between the fourth pipe port of the second heat exchanger 220 and the pipeline formed by the first heat exchanger 210 and the evaporator 500, so as to control the refrigerant flow rate flowing out of the second heat exchanger 220, reduce the pressure of the refrigerant, and further control the heat exchange capacity of the heat exchange system.

[0045] It should be noted that the first throttling component 610 in the embodiment of the present application may be a throttling component such as a capillary tube, an electronic expansion valve, etc., and the second throttling component 620 may be a capillary tube, or a combination of a capillary tube and a one-way valve. Figure 1 The first throttling component 610 is a capillary tube, and the second throttling component 620 includes a capillary tube and a one-way valve.

[0046] In some embodiments, when the first throttling component 610 includes a first capillary tube, and the second throttling component 620 includes a second capillary tube and a one-way valve, one end of the first capillary tube is connected to the third pipe port of the first heat exchanger 210, and the other end is connected to the input end of the evaporator 500, so as to control the refrigerant flow out of the first heat exchanger 210, reduce the pressure of the refrigerant, and provide a low-pressure refrigerant environment for the evaporator 500. One end of the second capillary tube is connected to the fourth pipe port of the second heat exchanger 220, and the other end is connected to the input end of the one-way valve. The output end of the one-way valve is connected to the input end of the evaporator 500. By setting the one-way valve, the refrigerant can be allowed to flow in one direction, preventing it from flowing in the opposite direction, and can prevent unnecessary backflow of the refrigerant, thereby improving the thermal efficiency of the entire heat exchange system.

[0047] Specifically, the flow direction of the refrigerant is described by taking the valve assembly conducting the first branch and the second branch under the full heating condition as an example. Under the full heating condition, the second switching valve 420 switches the first port and the second port, that is, Figure 1The refrigerant flows out from the exhaust port of the compressor 100, flows in through the first port of the first switching valve 410, and flows into the first pipe port of the first heat exchanger 210 through the fourth port of the first switching valve 410. The first heat exchanger 210 partially releases heat of the refrigerant on the water tank 200 and condenses it into liquid refrigerant. The liquid refrigerant flows from the third pipe port and the first capillary tube of the first heat exchanger 210 to the evaporator 500, and then flows from the evaporator 500 to the second port of the first switching valve 410, and finally flows from the third port of the first switching valve 410 into the air inlet of the compressor 100, that is, a circulation loop of the exhaust port of the compressor 100 - the D port and the C port of the first switching valve 410 - the first heat exchanger 210 - the first capillary tube - the evaporator 500 - the E port and the S port of the first switching valve 410 - the air inlet of the compressor 100 is formed, so as to heat the water body on the upper part of the water tank 200. At this time, the valve assembly conducts the second branch, and the refrigerant flows out from the exhaust port of the compressor 100, flows in through the first port of the second switching valve 420, and flows into the second pipe port of the second switching valve 420 through the second port of the first switching valve 410. The second heat exchanger 220 releases heat from the refrigerant in the lower part of the water tank 200 and condenses it into liquid refrigerant. The liquid refrigerant flows to the evaporator 500 through the fourth pipe port of the second heat exchanger 220, the second capillary and the one-way valve in turn, and then flows from the evaporator 500 to the second port of the first switching valve 410, and finally flows into the air inlet of the compressor 100 from the third port of the first switching valve 410, that is, a circulation loop of the exhaust port of the compressor 100-the D port and the E port of the second switching valve 420-the second heat exchanger 220-the second capillary-the one-way valve-the evaporator 500-the E port and the S port of the first switching valve 410-the air inlet of the compressor 100 is formed, thereby heating the water body in the lower part of the water tank 200.

[0048] refer to Figure 2 , Figure 2 A schematic structural diagram of a heat exchange system provided in another embodiment of the present application.

[0049] In some embodiments, Figure 2 The first throttling component 610 and the second throttling component 620 are both capillaries, that is, the first throttling component 610 is a first capillary, and the second throttling component 620 is a second capillary.

[0050] In some embodiments, when the valve assembly conducts the first branch and the second branch under full heat conditions, the second switching valve 420 switches the D port and the E port, and the compressor 100 delivers the high-temperature and high-pressure refrigerant to the first heat exchanger 210 and the second heat exchanger 220 through the first branch and the second branch, respectively. The refrigerant releases heat and condenses into liquid refrigerant in the upper and lower parts of the water tank 200, respectively, and then passes through the first capillary tube and the second capillary tube throttling, respectively, flows into the evaporator 500 to absorb heat, and becomes a gaseous refrigerant and flows into the compressor 100 for compression.

[0051] When the valve assembly conducts the first branch and cuts off the second branch under the rapid heating condition, the second switching valve 420 switches the E port and the S port. The compressor 100 delivers the high-temperature and high-pressure refrigerant to the first heat exchanger 210. The refrigerant partially releases heat on the water tank 200 and condenses into liquid refrigerant. Then, it passes through the first capillary throttling and flows into the evaporator 500 to absorb heat. It becomes a gaseous refrigerant and flows into the compressor 100 for compression. When the first heat exchanger 210 is working, the refrigerant in the second heat exchanger 220 will be completely drawn out to participate in the circulation flow.

[0052] Understandably, Figure 2 The refrigerant flow direction and Figure 1 The same as in the embodiments of the present application, the embodiments of the present application will not be repeated here.

[0053] refer to Figure 3 , Figure 3 A schematic structural diagram of a heat exchange system provided in another embodiment of the present application.

[0054] In some embodiments, the valve assembly includes a first switching valve 410, a first valve 720, and a second valve 710. The first switching valve 410 is disposed in the first branch, the first valve 720 is disposed in the second branch, and the first port ( Figure 3 The D port in the figure) is connected to the exhaust port of the compressor 100, and the second port ( Figure 3 The E port in the first heat exchanger 210 is connected to the third port of the first heat exchanger 210 and the fourth port of the second heat exchanger 220, and the third port of the first switching valve 410 ( Figure 3 The S port in the first switching valve 410 is connected to the second pipe port of the second heat exchanger 220, and the fourth port ( Figure 3 The C port in the compressor 100 is connected to the first pipe port of the first heat exchanger 210, the first end of the first valve 720 is connected to the third pipe port of the first heat exchanger 210, the second end of the first valve 720 is connected to the second pipe port of the second heat exchanger 220, and the second valve 710 is arranged in the pipeline between the air inlet of the compressor 100 and the second pipe port of the second heat exchanger 220.

[0055] It is worth noting that the first switching valve 410 in the embodiment of the present application is a four-way switching valve, and the first valve 720 and the second valve 710 can be solenoid valves or electronic expansion valves, and the embodiment of the present application does not make specific restrictions.

[0056] based on Figure 3 The structure of the heat exchange system is described below. The flow direction of the refrigerant in the valve assembly under rapid heating conditions is described in detail.

[0057] The valve assembly conducts the first branch and cuts off the second branch under the rapid heating condition. At this time, the first valve 720 is closed and the second valve 710 is opened. The refrigerant flows out from the exhaust port of the compressor 100, flows in through the first port of the first switching valve 410, and flows into the first pipe port of the first heat exchanger 210 through the fourth port of the first switching valve 410. The first heat exchanger 210 releases part of the heat of the refrigerant on the water tank 200 and condenses it into liquid refrigerant. The liquid refrigerant flows from the third pipe port of the first heat exchanger 210 to the second port of the first switching valve 410, and then flows into the air inlet of the compressor 100 from the third port of the first switching valve 410, that is, a circulation loop of the exhaust port of the compressor 100-the D port and the C port of the first switching valve 410-the first heat exchanger 210-the E port and the S port of the first switching valve 410-the air inlet of the compressor 100 is formed, thereby heating the water body on the upper part of the water tank 200. At this time, the valve assembly cuts off the second branch, that is, the first valve 720 is closed, and the refrigerant cannot flow into the second branch through the second switching valve 420. At this time, the refrigerant in the second heat exchanger 220 will be completely extracted to participate in the circulation flow. Specifically, the refrigerant flows into the air inlet of the compressor 100 through the second valve 710.

[0058] In some embodiments, the valve assembly is also used to connect the first branch and the second branch under full heating conditions. At this time, the refrigerant flowing out of the exhaust port of the compressor 100 flows into the first heat exchanger 210 through the first branch, and flows into the second heat exchanger 220 through the second branch, thereby heating the upper and lower water bodies of the water tank 200, that is, heating the entire water tank 200.

[0059] Specifically, Figure 3The structure is based on the first branch and the second branch under the whole heating condition. At this time, the first valve 720 is opened and the second valve 710 is closed. The refrigerant flows out from the exhaust port of the compressor 100, flows in through the first port of the first switching valve 410, and flows into the first pipe opening of the first heat exchanger 210 through the fourth port of the first switching valve 410. The first heat exchanger 210 releases part of the heat of the refrigerant on the water tank 200 and condenses it into liquid refrigerant. The liquid refrigerant flows out from the third pipe opening of the first heat exchanger 210, flows into the second pipe opening of the second heat exchanger 220 through the first valve 720. The air flows from the second pipe port to the fourth pipe port of the second heat exchanger 220 to the second port of the first switching valve 410, and finally flows from the third port of the first switching valve 410 into the air inlet of the compressor 100, thereby forming a circulation loop of the exhaust port of the compressor 100 - the D port and the C port of the first switching valve 410 - the first heat exchanger 210 - the first valve 720 - the second heat exchanger 220 - the E port and the S port of the first switching valve 410 - the air inlet of the compressor 100, thereby heating the upper water body and the lower water body of the water tank 200, and further heating the entire water tank 200.

[0060] It is worth noting that the embodiment of the present application adds a rapid heating mode in the conventional heat exchange system, so that the heat exchange system can not only heat the whole tank of hot water, but also heat part of the hot water in the water tank 200, thereby meeting a variety of usage scenarios.

[0061] In some embodiments, Figure 3 The area of ​​the first heat exchanger 210 is larger than that of the second heat exchanger 220. Under rapid heating conditions, the first heat exchanger 210 works alone. Since the area of ​​the first heat exchanger 210 is larger than that of the second heat exchanger 220, the exhaust pressure can be reduced. By avoiding excessive exhaust pressure, system failures caused by excessive pressure are further avoided, thereby improving the stability of the heat exchange system.

[0062] In some embodiments, the heat exchange system also includes an evaporator 500, the input end of the evaporator 500 is connected to the third pipe port of the first heat exchanger 210 and the fourth pipe port of the second heat exchanger 220, and the output end of the evaporator 500 is connected to the second port of the first switching valve 410, so as to absorb the heat of the refrigerant flowing out of the first heat exchanger 210 and / or the second heat exchanger 220, thereby improving the thermal stability of the heat exchange system and reducing temperature fluctuations.

[0063] In some embodiments, the heat exchange system also includes a first throttling component 610 and a second throttling component 620. The first throttling component 610 is arranged between the third pipe port of the first heat exchanger 210 and the input end of the evaporator 500, so as to control the refrigerant flow rate flowing out of the first heat exchanger 210, reduce the pressure of the refrigerant, and provide a low-pressure refrigerant environment for the evaporator 500. The second throttling component 620 is arranged between the fourth pipe port of the second heat exchanger 220 and the pipeline formed by the first heat exchanger 210 and the evaporator 500, so as to control the refrigerant flow rate flowing out of the second heat exchanger 220, reduce the pressure of the refrigerant, and further control the heat exchange capacity of the heat exchange system.

[0064] It should be noted that the first throttling component 610 in the embodiment of the present application may be a throttling component such as a capillary tube, an electronic expansion valve, etc., and the second throttling component 620 may be a capillary tube, or a combination of a capillary tube and a one-way valve. Figure 3 The first throttling component 610 is a capillary tube, and the second throttling component 620 includes a capillary tube and a one-way valve.

[0065] In some embodiments, when the first throttling component 610 includes a third capillary tube, and the second throttling component 620 includes a fourth capillary tube and a one-way valve, one end of the third capillary tube is connected to the third pipe port of the first heat exchanger 210, and the other end is connected to the input end of the evaporator 500, so as to control the refrigerant flow out of the first heat exchanger 210, reduce the refrigerant pressure, and provide a low-pressure refrigerant environment for the evaporator 500. One end of the fourth capillary tube is connected to the fourth pipe port of the second heat exchanger 220, and the other end is connected to the input end of the one-way valve. The output end of the one-way valve is connected to the input end of the evaporator 500. By setting the one-way valve, the refrigerant can be allowed to flow in one direction, preventing it from flowing in the opposite direction, and can prevent unnecessary backflow of the refrigerant, thereby improving the thermal efficiency of the entire heat exchange system.

[0066] Specifically, the flow direction of the refrigerant is described by taking the valve assembly conducting the first branch and the second branch under the full heat condition as an example. Under the full heat condition, the first valve 720 is opened, the second valve 710 is closed, the refrigerant flows out from the exhaust port of the compressor 100, flows in through the first port of the first switching valve 410, and flows into the first pipe port of the first heat exchanger 210 through the fourth port of the first switching valve 410. The first heat exchanger 210 partially releases heat from the refrigerant on the water tank 200 and condenses it into liquid refrigerant. The liquid refrigerant flows out from the third pipe port of the first heat exchanger 210, flows into the second pipe port of the second heat exchanger 220 through the first valve 720, and then flows out from the fourth pipe port of the second heat exchanger 220, and flows to the evaporator through the fourth capillary tube and the one-way valve in sequence. 500, then flows from the output end of the evaporator 500 to the second port of the first switching valve 410, and finally flows from the third port of the first switching valve 410 into the air inlet of the compressor 100, that is, a circulation loop of the exhaust port of the compressor 100 - the D port and the C port of the first switching valve 410 - the first heat exchanger 210 - the first valve 720 - the second heat exchanger 220 - the fourth capillary - the one-way valve - the evaporator 500 - the E port and the S port of the first switching valve 410 - the air inlet of the compressor 100 is formed, thereby heating the upper water body and the lower water body of the water tank 200, and further heating the entire water tank 200.

[0067] refer to Figure 4 , Figure 4 A schematic structural diagram of a heat exchange system provided in another embodiment of the present application.

[0068] In some embodiments, Figure 4 The first throttling component 610 is a third capillary tube, and the second throttling component 620 is an electronic expansion valve.

[0069] In some embodiments, when the valve assembly conducts the first branch and the second branch under full heat conditions, the first valve 720 is opened and the second valve 710 is closed, the compressor 100 sends the high-temperature and high-pressure refrigerant to the first heat exchanger 210 first, and then flows into the second heat exchanger 220 through the first valve 720. The refrigerant releases heat in the upper and lower parts of the water tank 200 and then condenses into liquid refrigerant, passes through the electronic expansion valve for throttling, and then flows into the evaporator 500 to absorb heat, becoming a gaseous refrigerant and flowing into the compressor 100 for compression.

[0070] When the valve assembly conducts the first branch and cuts off the second branch under the rapid heating condition, the first valve 720 is closed, the second valve 710 is opened, and the electronic expansion valve is closed at this time, that is, the channel between the fourth pipe port of the second heat exchanger 220 and the air inlet of the compressor 100 is cut off. At this time, the compressor 100 sends the high-temperature and high-pressure refrigerant to the first heat exchanger 210, and the refrigerant partially releases heat on the water tank 200 and condenses into liquid refrigerant, releases heat and then condenses into liquid refrigerant, and then passes through the third capillary throttling, flows into the evaporator 500 to absorb heat, and becomes a gaseous refrigerant and flows into the compressor 100 for compression. And when the first heat exchanger 210 is working, the refrigerant in the second heat exchanger 220 will be completely extracted to participate in the circulation flow.

[0071] Understandably, Figure 4 The refrigerant flow direction and Figure 3 The same as in the embodiments of the present application, the embodiments of the present application will not be repeated here.

[0072] refer to Figure 5 , Figure 5 A schematic structural diagram of a heat exchange system provided in another embodiment of the present application.

[0073] In some embodiments, the valve assembly includes a first switching valve 410 and a second switching valve 420, wherein the first switching valve 410 is disposed at the first branch, and the second switching valve 420 is disposed at the connection between the first branch and the second branch. Figure 5 The D port in the figure) is connected to the exhaust port of the compressor 100, and the second port ( Figure 5 The E port in the first heat exchanger 210 is connected to the third port of the first heat exchanger 210 and the fourth port of the second heat exchanger 220, and the third port of the first switching valve 410 ( Figure 5 The S port in the first switching valve 410 is connected to the air inlet of the compressor 100, and the fourth port ( Figure 5 The first port of the first heat exchanger 210 is connected to the first port of the second switching valve 420 ( Figure 5 The D port in the figure) is connected to the third pipe port of the first heat exchanger 210, and the second port ( Figure 5 The E port in the figure) is connected to the second pipe port of the second heat exchanger 220, and the third port ( Figure 5 The C port in the figure is connected to the second port of the first switching valve 410.

[0074] It is worth noting that the first switching valve 410 in the embodiment of the present application is a four-way switching valve, and the second switching valve 420 is a three-way switching valve.

[0075] based on Figure 5The structure of the heat exchange system is described below. The flow direction of the refrigerant in the valve assembly under rapid heating conditions is described in detail.

[0076] The valve assembly conducts the first branch and cuts off the second branch under the rapid heating condition. At this time, the second switching valve 420 switches to the first port and the third port, that is, the D port and the C port. When the valve assembly conducts the first branch, the refrigerant flows out from the exhaust port of the compressor 100, flows in through the first port of the first switching valve 410, and flows into the first pipe opening of the first heat exchanger 210 through the fourth port of the first switching valve 410. The first heat exchanger 210 releases part of the heat of the refrigerant on the water tank 200 and condenses it into liquid refrigerant. The liquid refrigerant is discharged from the first heat exchanger 210. The third pipe port flows to the first port of the second switching valve 420, and flows out from the third port of the second switching valve 420, flows to the second port of the first switching valve 410, and flows into the air inlet of the compressor 100 from the third port of the first switching valve 410, that is, a circulation loop of the exhaust port of the compressor 100-the D port and the C port of the first switching valve 410-the first heat exchanger 210-the D port and the C port of the second switching valve 420-the E port and the S port of the first switching valve 410-the air inlet of the compressor 100 is formed, so as to heat the water body on the upper part of the water tank 200. At this time, the valve assembly cuts off the second branch, that is, the refrigerant cannot flow into the second branch through the second switching valve 420, and the refrigerant in the second heat exchanger 220 will be completely drawn out to participate in the circulation flow.

[0077] In some embodiments, the valve assembly is also used to connect the first branch and the second branch under full heating conditions. At this time, the refrigerant flowing out of the exhaust port of the compressor 100 flows into the first heat exchanger 210 through the first branch, and flows into the second heat exchanger 220 through the second branch, thereby heating the upper and lower water bodies of the water tank 200, that is, heating the entire water tank 200.

[0078] Specifically, Figure 5 Based on the structure, under the whole heating condition, the valve assembly conducts the first branch and the second branch, at this time, the second switching valve 420 switches to the first port and the second port, that is, Figure 1The refrigerant flows out from the exhaust port of the compressor 100, flows in through the first port of the first switching valve 410, and flows into the first pipe opening of the first heat exchanger 210 through the fourth port of the first switching valve 410. The first heat exchanger 210 partially releases heat from the refrigerant on the water tank 200 and condenses it into liquid refrigerant, thereby heating the water body on the upper part of the water tank 200. The liquid refrigerant flows from the third pipe opening of the first heat exchanger 210 to the first port of the second switching valve 420, and flows out from the second port of the second switching valve 420 to the second pipe opening of the second heat exchanger 220. The second heat exchanger 220 The refrigerant releases heat in the lower part of the water tank 200 and condenses into liquid refrigerant, thereby heating the water in the lower part of the water tank 200. The refrigerant then flows out from the fourth pipe port of the second heat exchanger 220, flows into the second port of the first switching valve 410, and flows into the air inlet of the compressor 100 from the third port of the first switching valve 410, thus forming a circulation loop of the exhaust port of the compressor 100 - the D port and the C port of the first switching valve 410 - the first heat exchanger 210 - the D port and the E port of the second switching valve 420 - the second heat exchanger 220 - the E port and the S port of the first switching valve 410 - the air inlet of the compressor 100.

[0079] In some embodiments, Figure 5 The area of ​​the first heat exchanger 210 is larger than that of the second heat exchanger 220. Under rapid heating conditions, the first heat exchanger 210 works alone. Since the area of ​​the first heat exchanger 210 is larger than that of the second heat exchanger 220, the exhaust pressure can be reduced. By avoiding excessive exhaust pressure, system failures caused by excessive pressure are further avoided, thereby improving the stability of the heat exchange system.

[0080] In some embodiments, Figure 5 The heat exchange system also includes an evaporator 500, the input end of the evaporator 500 is connected to the third pipe port of the first heat exchanger 210 and the fourth pipe port of the second heat exchanger 220, and the output end of the evaporator 500 is connected to the second port of the first switching valve 410, so as to absorb the heat of the refrigerant flowing out of the first heat exchanger 210 and / or the second heat exchanger 220, thereby improving the thermal stability of the heat exchange system and reducing temperature fluctuations.

[0081] In some embodiments, the heat exchange system also includes a first throttling component 610 and a second throttling component 620. The first throttling component 610 is arranged between the third pipe port of the first heat exchanger 210 and the input end of the evaporator 500, and the first throttling component 610 is connected to the third port of the second switching valve 420, so as to control the refrigerant flow rate flowing out of the first heat exchanger 210, reduce the refrigerant pressure, and provide a low-pressure refrigerant environment for the evaporator 500. The second throttling component 620 is arranged between the fourth pipe port of the second heat exchanger 220 and the pipeline formed by the first heat exchanger 210 and the evaporator 500, so as to control the refrigerant flow rate flowing out of the second heat exchanger 220, reduce the refrigerant pressure, and further control the heat exchange capacity of the heat exchange system.

[0082] It should be noted that the first throttling component 610 in the embodiment of the present application may be a throttling component such as a capillary tube, an electronic expansion valve, etc., and the second throttling component 620 may be a capillary tube, or a combination of a capillary tube and a one-way valve. Figure 5 The first throttling component 610 is a capillary tube, and the second throttling component 620 includes a capillary tube and a one-way valve.

[0083] In some embodiments, when the first throttling component 610 includes a fifth capillary tube, and the second throttling component 620 includes a sixth capillary tube and a one-way valve, one end of the fifth capillary tube is connected to the third port of the second switching valve 420, and the other end is connected to the input end of the evaporator 500, so as to control the flow rate of the refrigerant flowing out of the first heat exchanger 210, reduce the pressure of the refrigerant, and provide a low-pressure refrigerant environment for the evaporator 500. One end of the sixth capillary tube is connected to the fourth pipe port of the second heat exchanger 220, and the other end is connected to the input end of the one-way valve. The output end of the one-way valve is connected to the input end of the evaporator 500. By setting the one-way valve, the refrigerant can be allowed to flow in one direction, preventing it from flowing in the opposite direction, and can prevent unnecessary backflow of the refrigerant, thereby improving the thermal efficiency of the entire heat exchange system.

[0084] Specifically, the flow direction of the refrigerant is described by taking the valve assembly conducting the first branch and the second branch under the full heating condition as an example. Under the full heating condition, the second switching valve 420 switches the first port and the second port, that is, Figure 5The refrigerant flows out from the exhaust port of the compressor 100, flows in through the first port of the first switching valve 410, and flows into the first pipe opening of the first heat exchanger 210 through the fourth port of the first switching valve 410. The first heat exchanger 210 releases heat from the refrigerant on the water tank 200 to condense it into liquid refrigerant, thereby heating the water body on the upper part of the water tank 200. The liquid refrigerant flows from the third pipe opening of the first heat exchanger 210 to the first port of the second switching valve 420, and flows out from the second port of the second switching valve 420 to the second pipe opening of the second heat exchanger 220. The second heat exchanger 220 releases heat from the refrigerant on the lower part of the water tank 200 to condense it into liquid refrigerant. The refrigerant releases heat and condenses into liquid refrigerant, thereby heating the water in the lower part of the water tank 200, and then flows out from the fourth pipe port of the second heat exchanger 220, flows into the second port of the first switching valve 410 through the sixth capillary and the one-way valve in sequence, and flows into the air inlet of the compressor 100 from the third port of the first switching valve 410, thus forming a circulation loop of the exhaust port of the compressor 100 - the D port and the C port of the first switching valve 410 - the first heat exchanger 210 - the D port and the E port of the second switching valve 420 - the second heat exchanger 220 - the sixth capillary - the one-way valve - the E port and the S port of the first switching valve 410 - the air inlet of the compressor 100.

[0085] It is worth noting that in the embodiment of the present application, the second switching valve 420 switches to the first port and the second port, and the compressor 100 first delivers the high-temperature and high-pressure refrigerant to the first heat exchanger 210, and then flows into the second heat exchanger 220 through the second switching valve 420. The refrigerant releases heat in the upper and lower parts of the water tank 200 and then condenses into liquid refrigerant, passes through the sixth capillary throttling, and then flows into the evaporator 500 to absorb heat, and becomes a gaseous refrigerant and flows into the compressor 100 for compression.

[0086] In some embodiments, when the second switching valve 420 is switched to the first port and the third port, that is, Figure 5 The compressor 100 delivers the high-temperature and high-pressure refrigerant to the first heat exchanger 210 through the D port and the C port in the first heat exchanger 210. The refrigerant releases heat at the upper part of the water tank 200 and condenses into liquid refrigerant. After passing through the fifth capillary throttling, it flows into the evaporator 500 to absorb heat and becomes a gaseous refrigerant that flows into the compressor 100 for compression. When the first heat exchanger 210 is working, most of the refrigerant in the second heat exchanger 220 will be drawn out to participate in the circulation flow.

[0087] refer to Figure 6 , Figure 6 A schematic structural diagram of a heat exchange system provided in another embodiment of the present application.

[0088] In some embodiments, the valve assembly includes a first switching valve 410 and a second switching valve 420, wherein the first switching valve 410 is disposed at the first branch, and the second switching valve 420 is disposed at the connection between the first branch and the second branch. Figure 6 The D port in the figure) is connected to the exhaust port of the compressor 100, and the second port ( Figure 6 The E port in the figure) is connected to the third pipe port of the first heat exchanger 210, and the third port ( Figure 6 The S port in the first switching valve 410 is connected to the air inlet of the compressor 100, and the fourth port ( Figure 6 The first port of the first heat exchanger 210 is connected to the first port of the second switching valve 420 ( Figure 6 The D port in the figure) is connected to the fourth port of the first switching valve 410, and the second port ( Figure 6 The E port in the figure) is connected to the second pipe port of the second heat exchanger 220, and the third port ( Figure 6 The C port in the middle is connected to the first pipe port of the first heat exchanger 210.

[0089] It is worth noting that the first switching valve 410 in the embodiment of the present application is a four-way switching valve, and the second switching valve 420 is a three-way switching valve.

[0090] based on Figure 6 The structure of the heat exchange system is described below. The flow direction of the refrigerant in the valve assembly under rapid heating conditions is described in detail.

[0091] The valve assembly opens the first branch and cuts off the second branch under rapid heating conditions. At this time, the second switching valve 420 switches to the first port and the third port, namely port D and port C. At this time, the second branch is cut off and the refrigerant cannot reach the second heat exchanger 220. When the valve assembly conducts the first branch, the refrigerant flows out from the exhaust port of the compressor 100, flows in through the first port of the first switching valve 410, flows into the first port of the first switching valve 410 through the fourth port of the first switching valve 410, and flows into the first port of the first heat exchanger 210 from the third port of the first switching valve 410. The first heat exchanger 210 partially releases heat from the refrigerant on the water tank 200 and condenses it into liquid refrigerant. The liquid refrigerant flows from the third port of the first heat exchanger 210 to the second port of the first switching valve 410, and flows into the air inlet of the compressor 100 from the third port of the first switching valve 410, i.e., a circulation loop of the exhaust port of the compressor 100 - the D port and the C port of the first switching valve 410 - the D port and the C port of the second switching valve 420 - the first heat exchanger 210 - the E port and the S port of the first switching valve 410 - the air inlet of the compressor 100 is formed, thereby heating the water body above the water tank 200.

[0092] In some embodiments, Figure 6 There is no difference between the areas of the first heat exchanger 210 and the second heat exchanger 220, that is, the area of ​​the first heat exchanger 210 can be larger than the area of ​​the second heat exchanger 220, or the area of ​​the first heat exchanger 210 can be smaller than the area of ​​the second heat exchanger 220, and so on. The embodiment of the present application is described by taking the example that the area of ​​the first heat exchanger 210 is smaller than the second heat exchanger 220. In this case, the valve assembly is also used to cut off the first branch and conduct the second branch under the heating condition. At this time, the refrigerant flowing out of the exhaust port of the compressor 100 flows into the second heat exchanger 220 through the second branch, and the heating requirement of the water tank 200 can be achieved only by heating the water in the lower part of the water tank 200.

[0093] Specifically, Figure 6 Based on the structure, under the whole heating condition, the valve assembly cuts off the first branch and conducts the second branch. At this time, the second switching valve 420 switches to the first port and the second port, that is, Figure 1 The D port and the E port in the heat exchanger 220 are connected. At this time, the first branch is cut off and the refrigerant cannot reach the second heat exchanger 220. The refrigerant flows out from the exhaust port of the compressor 100, flows in through the first port of the first switching valve 410, and flows to the first port of the second switching valve 420 through the fourth port of the first switching valve 410, and flows from the second port of the second switching valve 420 to the second pipe port of the second heat exchanger 220. The second heat exchanger 220 releases part of the heat of the refrigerant on the water tank 200 and condenses it into liquid refrigerant, thereby heating the water body in the lower part of the water tank 200. Then, it flows from the fourth pipe port of the second heat exchanger 220 to the second port of the first switching valve 410, and flows into the air inlet of the compressor 100 from the third port of the first switching valve 410, thus forming a circulation loop of the exhaust port of the compressor 100 - the D port and C port of the first switching valve 410 - the D port and E port of the second switching valve 420 - the second heat exchanger 220 - the E port and S port of the first switching valve 410 - the air inlet of the compressor 100. In the embodiment of the present application, under the full heating condition, the refrigerant flows into the second heat exchanger 220 through the second branch to heat the water body in the lower part of the water tank 200. Through the heat exchange of the refrigerant in the second heat exchanger 220, energy can be used more efficiently, and the temperature uniformity of the water body in the water tank 200 can be improved, avoiding the situation where the temperature of the upper water body is too high and the temperature of the lower water body is insufficient.

[0094] In some embodiments, Figure 6The heat exchange system also includes an evaporator 500, the input end of the evaporator 500 is connected to the third pipe port of the first heat exchanger 210 and the fourth pipe port of the second heat exchanger 220, and the output end of the evaporator 500 is connected to the second port of the first switching valve 410, so as to absorb the heat of the refrigerant flowing out of the first heat exchanger 210 and / or the second heat exchanger 220, thereby improving the thermal stability of the heat exchange system and reducing temperature fluctuations.

[0095] In some embodiments, the heat exchange system also includes a first throttling component 610 and a second throttling component 620. The first throttling component 610 is arranged between the third pipe port of the first heat exchanger 210 and the input end of the evaporator 500, and the first throttling component 610 is connected to the third port of the second switching valve 420, so as to control the refrigerant flow rate flowing out of the first heat exchanger 210, reduce the refrigerant pressure, and provide a low-pressure refrigerant environment for the evaporator 500. The second throttling component 620 is arranged between the fourth pipe port of the second heat exchanger 220 and the pipeline formed by the first heat exchanger 210 and the evaporator 500, so as to control the refrigerant flow rate flowing out of the second heat exchanger 220, reduce the refrigerant pressure, and further control the heat exchange capacity of the heat exchange system.

[0096] It should be noted that the first throttling component 610 in the embodiment of the present application may be a throttling component such as a capillary tube, an electronic expansion valve, etc., and the second throttling component 620 may be a capillary tube, or a combination of a capillary tube and a one-way valve. Figure 6 The first throttling component 610 is a capillary tube, and the second throttling component 620 includes a capillary tube and a one-way valve.

[0097] In some embodiments, when the first throttling assembly 610 includes a seventh capillary tube, and the second throttling assembly 620 includes an eighth capillary tube and a one-way valve, one end of the seventh capillary tube is connected to the third port of the second switching valve 420, and the other end is connected to the input end of the evaporator 500, so as to control the flow rate of the refrigerant flowing out of the first heat exchanger 210, reduce the pressure of the refrigerant, and provide a low-pressure refrigerant environment for the evaporator 500. One end of the eighth capillary tube is connected to the fourth pipe port of the second heat exchanger 220, and the other end is connected to the input end of the one-way valve. The output end of the one-way valve is connected to the input end of the evaporator 500. By setting the one-way valve, the refrigerant can be allowed to flow in one direction, preventing it from flowing in the opposite direction, and can prevent unnecessary backflow of the refrigerant, thereby improving the thermal efficiency of the entire heat exchange system.

[0098] Specifically, the flow direction of the refrigerant is described by taking the valve assembly as an example in which the first branch is cut off and the second branch is connected under the full heating condition. At this time, the second switching valve 420 switches to the first port and the second port, that is, Figure 1The D port and the E port in the first branch are cut off at this time, and the refrigerant cannot reach the second heat exchanger 220. The refrigerant flows out from the exhaust port of the compressor 100, flows in through the first port of the first switching valve 410, and flows to the first port of the second switching valve 420 through the fourth port of the first switching valve 410, and flows from the second port of the second switching valve 420 to the second pipe port of the second heat exchanger 220. The second heat exchanger 220 releases part of the heat of the refrigerant on the water tank 200 and condenses it into liquid refrigerant, thereby heating the water body at the bottom of the water tank 200, and then flows out from the fourth pipe port of the second heat exchanger 220, and passes through the eighth capillary tube and the single The refrigerant flows into the input end of the evaporator 500 through the valve, then flows from the output end of the evaporator 500 to the second port of the first switching valve 410, and flows from the third port of the first switching valve 410 into the air inlet of the compressor 100, that is, a circulation loop of the exhaust port of the compressor 100 - the D port and the C port of the first switching valve 410 - the D port and the E port of the second switching valve 420 - the second heat exchanger 220 - the eighth capillary - the one-way valve - the evaporator 500 - the E port and the S port of the first switching valve 410 - the air inlet of the compressor 100 is formed. In the embodiment of the present application, under the whole heating condition, the refrigerant flows into the second heat exchanger 220 through the second branch to heat the water body at the bottom of the water tank 200. Through the heat exchange of the refrigerant in the second heat exchanger 220, energy can be used more effectively, the temperature uniformity of the water body in the water tank 200 can be improved, and the situation that the temperature of the upper water body is too high and the temperature of the lower water body is insufficient can be avoided.

[0099] It is worth noting that the second switching valve 420 in the embodiment of the present application switches to the first port and the second port, and the compressor 100 first sends the high-temperature and high-pressure refrigerant to the second heat exchanger 220, and then flows into the second heat exchanger 220 through the second switching valve 420. The refrigerant releases heat in the upper and lower parts of the water tank 200 and then condenses into liquid refrigerant, passes through the eighth capillary throttling, and then flows into the evaporator 500 to absorb heat, and becomes a gaseous refrigerant and flows into the compressor 100 for compression. When the second heat exchanger 220 is working, most of the refrigerant in the first heat exchanger 210 will be drawn out to participate in the circulation flow.

[0100] In some embodiments, when the second switching valve 420 is switched to the first port and the third port, that is, Figure 6 The compressor 100 delivers the high-temperature and high-pressure refrigerant to the first heat exchanger 210 through the D port and the C port in the first heat exchanger 210. The refrigerant releases heat at the upper part of the water tank 200 and condenses into liquid refrigerant. After passing through the seventh capillary throttling, it flows into the evaporator 500 to absorb heat and becomes a gaseous refrigerant that flows into the compressor 100 for compression. When the first heat exchanger 210 is working, most of the refrigerant in the second heat exchanger 220 will be drawn out to participate in the circulation flow.

[0101] It can be understood that, in this embodiment, the whole tank of hot water in the water tank 200 can be heated individually through the above six methods, and a small portion of the hot water in the water tank 200 can also be heated individually, and this embodiment does not make specific limitations.

[0102] It can be understood by those skilled in the art that Figure 1-6 The schematic diagrams shown in the figure do not constitute a limitation on the embodiments of the present application, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0103] The features disclosed in the various product embodiments provided by the utility model can be arbitrarily combined without conflict to obtain new product embodiments.

[0104] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, i.e., they may be located in one place, or they may be distributed to multiple network nodes. Exemplarily, the division of units is only a logical function division, and there may be other division methods in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be ignored, or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed may be through some interfaces, indirect coupling or communication connection of devices or units, which may be electrical, mechanical, or other forms. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment.

[0105] It will be appreciated by those skilled in the art that the system disclosed above may be implemented as software, firmware, hardware, and appropriate combinations thereof. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit.

[0106] The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the above implementation mode. Technical personnel familiar with the field can also make various equivalent deformations or substitutions without violating the spirit of the present invention. These equivalent deformations or substitutions are all included in the scope defined by the claims of the present invention.

Claims

1. A heat exchange system, characterized in that: The heat exchange system comprises a compressor, a first heat exchanger and a second heat exchanger, wherein the first heat exchanger and the second heat exchanger are both arranged in a water tank, and the first heat exchanger is located above the second heat exchanger, and the heat exchange system further comprises: A refrigerant branch, comprising a first branch and a second branch, wherein the first pipe port of the first heat exchanger is connected to the exhaust port of the compressor through the first branch, and the second pipe port of the second heat exchanger is connected to the exhaust port of the compressor through the second branch; A valve assembly is arranged on the refrigerant branch, and the valve assembly is used to conduct the first branch and cut off the second branch under rapid heating conditions.

2. The heat exchange system according to claim 1, characterized in that: The valve assembly includes a first switching valve and a second switching valve, the first switching valve is arranged on the first branch, the second switching valve is arranged on the second branch, the first port of the first switching valve is connected to the exhaust port of the compressor, the second port of the first switching valve is connected to the third pipe port of the first heat exchanger and the fourth pipe port of the second heat exchanger, the third port of the first switching valve is connected to the air inlet of the compressor, the fourth port of the first switching valve is connected to the first pipe port of the first heat exchanger, the first port of the second switching valve is connected to the exhaust port of the compressor, the second port of the second switching valve is connected to the second pipe port of the second heat exchanger, and the third port of the second switching valve is connected to the air inlet of the compressor.

3. The heat exchange system according to claim 1, characterized in that: The valve assembly includes a first switching valve, a first valve and a second valve, the first switching valve is arranged on the first branch, the first valve is arranged on the second branch, the first port of the first switching valve is connected to the exhaust port of the compressor, the second port of the first switching valve is connected to the third pipe port of the first heat exchanger and the fourth pipe port of the second heat exchanger, the third port of the first switching valve is connected to the two pipe ports of the second heat exchanger, the fourth port of the first switching valve is connected to the first pipe port of the first heat exchanger, the first end of the first valve is connected to the third pipe port of the first heat exchanger, the second end of the first valve is connected to the second pipe port of the second heat exchanger, and the second valve is arranged in the pipeline between the air inlet of the compressor and the second pipe port of the second heat exchanger.

4. The heat exchange system according to claim 1, characterized in that: The valve assembly includes a first switching valve and a second switching valve, the first switching valve is arranged on the first branch, the second switching valve is arranged at the connection between the first branch and the second branch, the first port of the first switching valve is connected to the exhaust port of the compressor, the second port of the first switching valve is connected to the third pipe port of the first heat exchanger and the fourth pipe port of the second heat exchanger, the third port of the first switching valve is connected to the air inlet of the compressor, the fourth port of the first switching valve is connected to the first pipe port of the first heat exchanger, the first port of the second switching valve is connected to the third pipe port of the first heat exchanger, the second port of the second switching valve is connected to the second pipe port of the second heat exchanger, and the third port of the second switching valve is connected to the second port of the first switching valve.

5. The heat exchange system according to claim 1, characterized in that: The valve assembly includes a first switching valve and a second switching valve, the first switching valve is arranged on the first branch, the second switching valve is arranged at the connection between the first branch and the second branch, the first port of the first switching valve is connected to the exhaust port of the compressor, the second port of the first switching valve is connected to the third pipe port of the first heat exchanger, the third port of the first switching valve is connected to the air inlet of the compressor, the fourth port of the first switching valve is connected to the first pipe port of the first heat exchanger, the first port of the second switching valve is connected to the fourth port of the first switching valve, the second port of the second switching valve is connected to the second pipe port of the second heat exchanger, and the third port of the second switching valve is connected to the first pipe port of the first heat exchanger.

6. The heat exchange system according to any one of claims 2 to 4, characterized in that: The area of ​​the first heat exchanger is greater than the area of ​​the second heat exchanger, and the valve assembly is also used to conduct the first branch and the second branch under full heating conditions.

7. The heat exchange system according to claim 5, characterized in that: The valve assembly is also used to cut off the first branch and conduct the second branch under full heat conditions.

8. The heat exchange system according to any one of claims 2 to 5, characterized in that: The heat exchange system further includes an evaporator, an input end of the evaporator is connected to the third pipe port of the first heat exchanger and the fourth pipe port of the second heat exchanger, and an output end of the evaporator is connected to the second port of the first switching valve.

9. The heat exchange system according to claim 8, characterized in that: The heat exchange system also includes a first throttling component and a second throttling component, the first throttling component is arranged between the third pipe port of the first heat exchanger and the input end of the evaporator, and the second throttling component is arranged between the fourth pipe port of the second heat exchanger and the pipeline formed by the first heat exchanger and the evaporator.

10. The heat exchange system according to any one of claims 2 to 5, characterized in that: The first switching valve is a four-way switching valve.

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