Heat pump hot water system with multi-phase-change-point heat storage device

Abstract

The utility model relates to the technical field of heat pump water heaters, in particular to a heat pump hot water system with a multi-phase-change-point heat storage device, which comprises a heat pump host, the multi-phase-change-point heat storage device, a water tank, a large-flow pump, a small-flow pump, a first control valve and a second control valve. According to the scheme, the multi-phase-change-point heat storage device and the heat storage water tank are arranged in the system in a combined mode, different phase change points are adopted in partitions of the multi-phase-change-point heat pump heat storage device for heat storage, heat released by a heat pump is fully absorbed, the heat storage effect is good, heat exchange with the maximum logarithm temperature difference is achieved, the heat exchange amount is the maximum with the same heat exchange area, and therefore the heat exchange efficiency is improved. The volume of the water tank can be effectively reduced and the occupied area of the system is saved. When hot water is used, cold water can be stored firstly, the temperature of water entering the water tank is higher than that of tap water, the hot water utilization rate and water yield of the water tank are improved, and the unit energy efficiency is improved. And when the heat pump main machine does not produce hot water, trough electric heating heat storage can be adopted, the operation cost can be greatly reduced, and the actual operation energy efficiency of the unit is high.

Description

Technical Field

[0001] The utility model relates to the technical field of heat pump water heaters, in particular to a heat pump water heating system with a multi-phase change point heat storage device. Background Art

[0002] Heat pump water heaters generally use water temperature difference to store heat, which requires a large water tank with limited heat storage capacity. The water tank is too large and the cost of configuring the unit is too high, resulting in increased investment. It also cannot fully utilize off-peak electricity, increasing operating costs. Summary of the invention

[0003] In order to solve the above problems, the purpose of the utility model is to provide a heat pump hot water system with a multi-phase change point heat storage device. By arranging a multi-phase change point heat storage device in combination with a water storage tank, the energy efficiency of the heat pump water heater is improved, while the hot water utilization rate and water output of the water tank are improved, valley electricity is stored, the operating cost is reduced, the volume of the water tank is reduced, and the system footprint is saved.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0005] A heat pump hot water system with a multi-phase transition point heat storage device, comprising a heat pump host, characterized in that it also comprises a multi-phase transition point heat storage device, a water tank, a large flow pump, a small flow pump, a first control valve and a second control valve; the heat pump host has a first circulation interface, a second circulation interface and a direct heating interface, the water tank has a cold water inlet, a hot water inlet and a cold water outlet, the multi-phase transition point heat storage device has a heat storage inlet, a tap water inlet, a first outlet and a second outlet, wherein,

[0006] The first outlet is connected to the cold water inlet through a first connecting pipe, the second outlet is connected to the direct heating interface through a second connecting pipe, the cold water outlet is connected to the second circulation interface through a third connecting pipe, the heat storage inlet is connected to the first circulation interface through a fourth connecting pipe, and the fourth connecting pipe is connected to the hot water inlet through a fifth connecting pipe;

[0007] The first control valve is arranged on the fifth connecting pipe, the second control valve is arranged on the fourth connecting pipe and is located between the connecting end of the fifth connecting pipe and the fourth connecting pipe and the heat storage inlet, the large flow pump is arranged on the third connecting pipe, and the small flow pump is arranged on the second connecting pipe;

[0008] The multi-phase change point heat storage device is provided with multiple phase change zones, and phase change materials with different phase change point temperatures are respectively provided in the multiple phase change zones; when the heat pump hot water system heats hot water, the large flow pump and the first control valve are opened, and the second control valve is closed; when the heat pump hot water system stores heat, the first control valve and the large flow pump are closed, and the small flow pump and the second control valve are opened.

[0009] Preferably, the multiple phase change zones include a low-temperature zone, a high-temperature zone, and a plurality of medium-temperature zones arranged between the low-temperature zone and the high-temperature zone, wherein the phase change point temperature increases successively from the low-temperature zone side to the high-temperature zone side, the tap water inlet and the second outlet are arranged on the low-temperature zone, and the heat storage inlet and the first outlet are arranged on the high-temperature zone.

[0010] Preferably, the heat pump host comprises a compressor, a four-way valve, a first condenser, a second condenser, a first solenoid valve, a second solenoid valve, a first check valve, a third check valve, a water pump and an evaporator; wherein the first condenser and the second condenser are arranged in parallel; the first condenser and the second condenser are both provided with a first inlet, a second inlet, a first outlet and a second outlet;

[0011] The first outlet of the first condenser is communicated with the first inlet of the second condenser, the second outlet of the first condenser is communicated with the first circulation interface through a first branch, the first branch is communicated with the second outlet of the second condenser through a second branch, and the first solenoid valve is arranged on the second branch;

[0012] The second inlet of the second condenser is connected to the outlet end of the water pump through the third branch, and the inlet end of the water pump is connected to the second circulation interface; the third one-way valve is arranged on the third branch; a fourth branch is connected between the third one-way valve and the second inlet of the second condenser, the other end of the fourth branch is connected to the direct heating interface, and the second solenoid valve is arranged on the fourth branch; a fifth branch is connected between the water pump and the third one-way valve, the other end of the fifth branch is connected to the second inlet of the first condenser, and the first one-way valve is arranged on the fifth branch;

[0013] A sixth branch is provided on the fifth branch between the first one-way valve and the second inlet of the first condenser and connected to a portion of the second branch between the first solenoid valve and the second outlet of the second condenser.

[0014] Preferably, it further comprises a second one-way valve, which is arranged on the sixth branch to prevent the fluid from flowing back into the second condenser.

[0015] Preferably, when the heat pump hot water system heats hot water, the first solenoid valve is opened and the second solenoid valve is closed; at this time, the fluid enters the system from the second circulation interface and is divided into a first flow path and a second flow path after passing through the water pump. The first flow path passes through the third one-way valve, the second condenser, and the first solenoid valve in sequence, and finally flows out from the first circulation interface; the second flow path passes through the first one-way valve, the first condenser in sequence, and finally flows out from the first circulation interface.

[0016] Preferably, when the heat pump hot water system stores heat, the first solenoid valve is closed and the second solenoid valve is opened; at this time, the fluid in the direct-heating heat pump hot water system enters the system from the direct-heating interface and passes through the second solenoid valve, the second condenser, the second one-way valve, the first condenser in sequence, and finally flows out from the first circulation interface.

[0017] The utility model adopts the above technical solution, and adds a multi-phase change point heat pump heat storage device composed of multiple phase change point materials in the heat pump hot water system. Different phase change points are used for heat storage in different zones, which fully absorbs the heat released by the heat pump, has a good heat storage effect, and realizes the maximum logarithmic temperature difference heat exchange. With the same heat exchange area, the heat exchange amount is maximized.

[0018] At the same time, the heat pump host is a circulation and direct heating integrated machine. When producing hot water, the heat pump host adopts a circulation mode with a large water flow. When the heat pump host is idle, the heat pump host adopts a direct heating mode with fast water flow and high heat storage efficiency. When the heat pump host does not produce hot water, it can use valley electric heating to store heat, and the actual operation of the unit is highly energy efficient. In addition, when using hot water, you can first store cold water, so that the temperature of the water entering the water tank is higher than that of tap water, which improves the utilization rate and water output of the water tank, improves the energy efficiency of the unit, reduces operating costs, and saves system floor space. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The system diagram of a heat pump hot water system with a multi-phase change point heat storage device.

[0020] Figure 2 The water flow diagram of a heat pump hot water system with a multi-phase change point heat storage device when storing hot water.

[0021] Figure 3 The diagram shows the water flow direction when hot water is produced in a heat pump hot water system with a multi-phase transition point heat storage device.

[0022] Figure 4 This is the system diagram of the heat pump host.

[0023] Figure 5 This is the water flow diagram when the heat pump host is in direct heating mode.

[0024] Figure 6 This is the water flow diagram when the heat pump host is in circulation mode. Implementation

[0025] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more, unless otherwise clearly defined.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0030] like Figures 1 to 3As shown, a heat pump hot water system with a multi-phase change point heat storage device includes a heat pump host 1, a multi-phase change point heat storage device 2, a water tank 3, a large flow pump 4, a small flow pump 5, a first control valve 6 and a second control valve 7; the heat pump host 1 has a first circulation interface 100, a second circulation interface 200 and a direct heating interface 300, the water tank 3 has a cold water inlet, a hot water inlet and a cold water outlet, the multi-phase change point heat storage device 2 has a heat storage inlet 8, a tap water inlet 9, a first outlet and a second outlet, wherein,

[0031] The first outlet is connected to the cold water inlet through a first connecting pipe 10, the second outlet is connected to the direct heating interface 300 through a second connecting pipe 11, the cold water outlet is connected to the second circulation interface 200 through a third connecting pipe 12, the heat storage inlet 8 is connected to the first circulation interface 100 through a fourth connecting pipe 13, and the fourth connecting pipe 13 is connected to the hot water inlet through a fifth connecting pipe 14;

[0032] The first control valve 6 is arranged on the fifth connecting pipe 14, the second control valve 7 is arranged on the fourth connecting pipe 13 and is located between the connecting end of the fifth connecting pipe 14 and the fourth connecting pipe 13 and the heat storage inlet 8, the large flow pump 4 is arranged on the third connecting pipe 12, and the small flow pump 5 is arranged on the second connecting pipe 11;

[0033] The multi-phase change point heat storage device 2 is provided with multiple phase change zones, and phase change materials with different phase change point temperatures are respectively provided in the multiple phase change zones; when the heat pump hot water system heats hot water, the large flow pump 4 and the first control valve 6 are opened, and the second control valve 7 is closed; when the heat pump hot water system stores heat, the first control valve 6 and the large flow pump 4 are closed, and the small flow pump 5 and the second control valve 7 are opened.

[0034] Furthermore, the multiple phase change zones include a low temperature zone 15, a high temperature zone 16, and a plurality of medium temperature zones 17 arranged between the low temperature zone 15 and the high temperature zone 16, wherein the phase change point temperature increases successively from the low temperature zone 15 side to the high temperature zone 16 side; the tap water inlet 9 and the second outlet are arranged on the low temperature zone 15, and the heat storage inlet 8 and the first outlet are arranged on the high temperature zone 16.

[0035] like Figures 4 to 6 As shown, the heat pump host 1 includes a compressor, a four-way valve, a first condenser 18, a second condenser 19, a first solenoid valve 20, a second solenoid valve 21, a first check valve 22, a third check valve 23, a water pump 24 and an evaporator; wherein the first condenser 18 and the second condenser 19 are arranged in parallel; the first condenser 18 and the second condenser 19 are both provided with a first inlet, a second inlet, a first outlet and a second outlet;

[0036] The first outlet 25 of the first condenser is communicated with the first inlet 26 of the second condenser, the second outlet 27 of the first condenser is communicated with the first circulation interface 100 through a first branch, the first branch is communicated with the second outlet 28 of the second condenser through a second branch, and the first solenoid valve 20 is arranged on the second branch;

[0037] The second inlet 29 of the second condenser is connected to the outlet end of the water pump 24 through the third branch, and the inlet end of the water pump 24 is connected to the second circulation interface 200; the third one-way valve 23 is arranged on the third branch; a fourth branch is connected between the third one-way valve 23 and the second inlet 29 of the second condenser, the other end of the fourth branch is connected to the direct heating interface 300, and the second solenoid valve 21 is arranged on the fourth branch; a fifth branch is connected between the water pump 24 and the third one-way valve 23, the other end of the fifth branch is connected to the second inlet 30 of the first condenser, and the first one-way valve 22 is arranged on the fifth branch;

[0038] A sixth branch is provided on the fifth branch between the first check valve 22 and the second inlet 30 of the first condenser and connected to a portion of the second branch between the first solenoid valve 20 and the second outlet 28 of the second condenser.

[0039] Furthermore, the heat pump host further includes a second one-way valve 31 , which is disposed on the sixth branch to prevent the fluid from flowing back into the second condenser 19 .

[0040] Furthermore, when the heat pump hot water system heats hot water, the first solenoid valve 20 is opened and the second solenoid valve 21 is closed; at this time, the fluid enters the system from the second circulation interface 200 and is divided into a first flow path and a second flow path after passing through the water pump 24. The first flow path passes through the third one-way valve 23, the second condenser 19, and the first solenoid valve 20 in sequence, and finally flows out from the first circulation interface 100; the second flow path passes through the first one-way valve 22 and the first condenser 18 in sequence, and finally flows out from the first circulation interface 100.

[0041] Furthermore, when the heat pump hot water system stores heat, the first solenoid valve 20 is closed and the second solenoid valve 21 is opened; at this time, the fluid in the direct heating heat pump hot water system enters the system from the direct heating interface 300 and passes through the second solenoid valve 21, the second condenser 19, the second one-way valve 31, the first condenser 18 in sequence, and finally flows out from the first circulation interface 100.

[0042] It should be noted here that if Figure 4 In the figure, the water inlet 400 of the direct heating interface is another tap water inlet.

[0043] In this specific embodiment, the existing heat pump water heater uses water temperature difference heat storage, which requires a large water tank with limited heat storage capacity. The water tank is too large and the cost of configuring the unit is too high, resulting in increased investment, and the inability to fully utilize valley electricity, resulting in increased operating costs. The above scheme combines a multi-phase change point heat storage device and a water storage tank in the system. The partitions of the multi-phase change point heat pump heat storage device use different phase change points for heat storage, which fully absorbs the heat released by the heat pump, has a good heat storage effect, and realizes the maximum logarithmic temperature difference heat exchange. For the same heat exchange area, the heat exchange amount is maximized. Therefore, the volume of the water tank can be effectively reduced, saving system floor space.

[0044] At the same time, the heat pump host is a circulating and direct heating all-in-one machine. When producing hot water, the heat pump host adopts a circulating mode with a large water flow rate. It should be noted here that when using hot water, cold water can be stored first, and the water temperature entering the water tank is higher than tap water, which improves the hot water utilization rate and water output of the water tank and improves the energy efficiency of the unit. When the heat pump host is idle, the heat pump host adopts a direct heating mode with fast water flow and high heat storage efficiency. When the heat pump host does not produce hot water, it can use valley electric heating to store heat, which can greatly reduce the operating cost and make the actual operation of the unit highly energy efficient.

[0045] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0046] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. A heat pump hot water system with a multi-phase change point heat storage device, comprising a heat pump host (1), characterized in that: It also includes a multi-phase change point heat storage device (2), a water tank (3), a large flow pump (4), a small flow pump (5), a first control valve (6) and a second control valve (7); the heat pump host (1) has a first circulation interface (100), a second circulation interface (200) and a direct heating interface (300); the water tank (3) has a cold water inlet, a hot water inlet and a cold water outlet; the multi-phase change point heat storage device (2) has a heat storage inlet (8), a tap water inlet (9), a first outlet and a second outlet, wherein: The first outlet is connected to the cold water inlet via a first connecting pipe (10), the second outlet is connected to the direct heating interface (300) via a second connecting pipe (11), the cold water outlet is connected to the second circulation interface (200) via a third connecting pipe (12), the heat storage inlet (8) is connected to the first circulation interface (100) via a fourth connecting pipe (13), and a fifth connecting pipe (14) is provided between the fourth connecting pipe (13) and the hot water inlet; The first control valve (6) is arranged on the fifth connecting pipe (14), the second control valve (7) is arranged on the fourth connecting pipe (13) and is located between the connecting end of the fifth connecting pipe (14) and the fourth connecting pipe (13) and the heat storage inlet (8), the large flow pump (4) is arranged on the third connecting pipe (12), and the small flow pump (5) is arranged on the second connecting pipe (11); The multi-phase change point heat storage device (2) is provided with a plurality of phase change zones, each of which is provided with a phase change material having a different phase change point temperature; when the heat pump hot water system heats hot water, the large flow pump (4) and the first control valve (6) are opened, and the second control valve (7) is closed; when the heat pump hot water system stores heat, the first control valve (6) and the large flow pump (4) are closed, and the small flow pump (5) and the second control valve (7) are opened.

2. A heat pump hot water system with a multi-phase transition point heat storage device according to claim 1, characterized in that: The plurality of phase change zones include a low temperature zone (15), a high temperature zone (16), and a plurality of medium temperature zones (17) arranged between the low temperature zone (15) and the high temperature zone (16), wherein the phase change point temperature increases successively from the low temperature zone (15) side to the high temperature zone (16) side; the tap water inlet (9) and the second outlet are arranged on the low temperature zone (15); and the heat storage inlet (8) and the first outlet are arranged on the high temperature zone (16).

3. A heat pump hot water system with a multi-phase transition point heat storage device according to claim 1, characterized in that: The heat pump host (1) comprises a compressor, a four-way valve, a first condenser (18), a second condenser (19), a first solenoid valve (20), a second solenoid valve (21), a first check valve (22), a third check valve (23), a water pump (24), and an evaporator; wherein the first condenser (18) and the second condenser (19) are arranged in parallel; and the first condenser (18) and the second condenser (19) are both provided with a first inlet, a second inlet, a first outlet, and a second outlet; The first outlet (25) of the first condenser is in communication with the first inlet (26) of the second condenser, the second outlet (27) of the first condenser is in communication with the first circulation interface (100) via a first branch, the first branch is in communication with the second outlet (28) of the second condenser via a second branch, and the first solenoid valve (20) is arranged on the second branch; The second inlet (29) of the second condenser is connected to the outlet end of the water pump (24) through a third branch, and the inlet end of the water pump (24) is connected to the second circulation interface (200); the third one-way valve (23) is arranged on the third branch; a fourth branch is connected between the third one-way valve (23) and the second inlet (29) of the second condenser, the other end of the fourth branch is connected to the direct heating interface (300), and the second solenoid valve (21) is arranged on the fourth branch; a fifth branch is connected between the water pump (24) and the third one-way valve (23), the other end of the fifth branch is connected to the second inlet (30) of the first condenser, and the first one-way valve (22) is arranged on the fifth branch; A sixth branch is provided on the fifth branch between the first one-way valve (22) and the second inlet (30) of the first condenser and the second branch between the first solenoid valve (20) and the second outlet (28) of the second condenser.

4. A heat pump hot water system with a multi-phase transition point heat storage device according to claim 3, characterized in that: It also includes a second one-way valve (31), which is arranged on the sixth branch to prevent the fluid from flowing back into the second condenser (19).

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