Heat pump system with energy storage function

Abstract

The utility model relates to a heat pump system with an energy storage function, which comprises a heat source pipe, a first evaporator, a second evaporator, a cooler, a first compressor, a first expansion valve and an energy storage device connected between an outlet of the first expansion valve and an inlet of the first compressor. According to the technical scheme, the energy storage device comprises a shell, an inner container, a supporting rib plate, a metal positioning block arranged in the inner container, a third evaporator arranged in the center of the metal positioning block, a plurality of phase-change material storage cavities arranged around the metal positioning block and phase-change materials arranged in the phase-change material storage cavities, and the other end of the shell is connected with a second expansion valve through a pipeline. An outlet of the second expansion valve is connected with an inlet pipeline of the second evaporator, one end of the third evaporator communicates with an outlet of the first expansion valve through the first switching valve, and the other end of the third evaporator communicates with an inlet of the first compressor through the second switching valve. The system solves the problem that an energy storage device in an existing heat pump system is poor in energy storage capacity, and the utilization rate of heat source waste heat is remarkably increased.

Description

Technical Field

[0001] The utility model relates to the technical field of heat pump heating, in particular to a heat pump system with energy storage function. Background Art

[0002] The heat pump system mainly absorbs heat energy from air source, water source, ground source heat pump or a combination of multiple sources to supply indoors for industrial processes or heating, replacing traditional coal-fired boilers to achieve industrial energy saving, consumption reduction and efficiency improvement. However, the heat pump system is highly dependent on the heat source. When the heat source has low heat, the heating efficiency is reduced and effective heating cannot be achieved.

[0003] CN 221036250 U discloses a heat pump system with energy storage function, including a heat source tube and an energy storage device. The heat source tube is provided with a circulating heating component for absorbing the first heat of the heat source tube and a circulating heating component for absorbing the secondary heat of the heat source tube in sequence along its flow direction. The circulating heating component provides heat for the energy storage device, and the energy storage device is used to provide heat to the circulating heating component. When the heat source tube continues to flow the heat source, the circulating heating component can use the secondary heat to realize heating and energy storage of the energy storage device. When the heat source tube no longer supplies the heat source, the heat inside the energy storage device can provide the heat required for the circulation heating component to work, so as to realize the continuous and long-term operation of the circulation heating component, and is intended to make full use of the secondary heat after heat exchange in the heat source. However, there are still the following problems: the energy storage device adopts an energy storage water tank to absorb heat and store energy, and the energy storage capacity is poor. Utility Model Content

[0004] The purpose of the utility model is to provide a heat pump system with energy storage function which is reasonable in structure and reliable in use, so as to solve the problem of poor energy storage capacity of energy storage devices in existing heat pump systems and significantly improve the utilization rate of waste heat from heat sources.

[0005] The technical solution of the utility model is:

[0006] A heat pump system with energy storage function comprises a heat source pipe, a first evaporator and a second evaporator arranged in sequence along the length direction of the heat source pipe, a cooler arranged between the outlet pipeline and the inlet pipeline of the first evaporator, a first compressor arranged on the outlet pipeline of the first evaporator, and a first expansion valve arranged on the inlet pipeline of the first evaporator. An energy storage device is connected between the outlet of the first expansion valve and the inlet of the first compressor. The technical key points are: the energy storage device comprises an outer shell, an inner tank arranged in the outer shell, a supporting rib plate arranged in the inner tank and the outer shell, a metal positioning block arranged in the inner tank, a third evaporator arranged at the center of the metal positioning block, a plurality of phase change material storage cavities arranged around the metal positioning block, and a phase change material arranged in the phase change material storage cavity. The outlet pipeline of the second evaporator is connected to the second compressor, the outlet pipeline of the second compressor is connected to the outer shell, the other end of the outer shell is connected to the second expansion valve by a pipeline, the outlet of the second expansion valve is connected to the inlet pipeline of the second evaporator, one end of the third evaporator is connected to the outlet of the first expansion valve by a first switching valve, and the other end is connected to the inlet of the first compressor by a second switching valve.

[0007] In the above-mentioned heat pump system with energy storage function, the phase change material storage cavity of the metal positioning block is provided with a cover at one end and a sealing film at the other end.

[0008] In the above-mentioned heat pump system with energy storage function, a heat preservation cavity is formed between the outer circumference of the inner tank and the inner circumference of the outer shell, and the number of the supporting ribs is multiple and multiple water holes are provided on the supporting ribs.

[0009] The beneficial effects of the utility model are:

[0010] 1. When in use, the second evaporator is used to absorb the residual heat in the heat source tube and transfer it to the space between the outer shell and the inner tank of the energy storage device. The heat is transferred to the phase change material through the inner tank and the metal positioning block, so that the phase change material quickly absorbs heat and undergoes phase change to achieve heat storage. The space between the outer shell and the inner tank has a heat preservation effect, and the metal positioning block has good thermal conductivity, so that the phase change material can quickly store heat. When the heat source tube no longer supplies heat, the third evaporator is connected to the first expansion valve and the first compressor, and the medium flowing through the third evaporator absorbs the heat stored in the phase change material in each phase change material storage cavity, thereby fully utilizing the residual heat of the heat source tube. Compared with water tank heat storage, the utility model has good thermal conductivity and strong heat storage capacity, which solves the problem of poor energy storage capacity of energy storage devices in existing heat pump systems and significantly improves the utilization rate of residual heat from heat sources.

[0011] 2. The sealing film realizes the volume compensation effect on the phase change material in the phase change material storage cavity before and after the phase change, and is also beneficial to heat transfer. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is the structural principle diagram of the utility model;

[0013] Figure 2 yes Figure 1 A schematic diagram of the structure of the energy storage device;

[0014] Figure 3 yes Figure 2 AA section view.

[0015] In the figure: 1. heat source tube, 2. first evaporator, 3. second evaporator, 4. second expansion valve, 5. second compressor, 6. first switching valve, 7. first expansion valve, 8. cooler, 9. first compressor, 10. second switching valve, 11. energy storage device, 1101. outer shell, 1102. liner, 1103. supporting rib plate, 1104. metal positioning block, 1105. sealing film, 1106. sealing cover, 1107. water hole, 12. third evaporator. DETAILED DESCRIPTION

[0016] The utility model is described in detail according to the accompanying drawings of the specification.

[0017] like Figure 1 to Figure 3 As shown, the heat pump system with energy storage function includes a heat source pipe 1, a first evaporator 2 and a second evaporator 3 arranged in sequence along the length direction of the heat source pipe 1, a cooler 8 arranged between the outlet pipeline and the inlet pipeline of the first evaporator 2, a first compressor 9 arranged on the outlet pipeline of the first evaporator 2, and a first expansion valve 7 arranged on the inlet pipeline of the first evaporator 2, and an energy storage device 11 is connected between the outlet of the first expansion valve 7 and the inlet of the first compressor 9.

[0018] Among them, the energy storage device 11 includes an outer shell 1101, an inner tank 1102 arranged in the outer shell 1101, a supporting rib plate 1103 arranged in the inner tank 1102 and the outer shell 1101, a metal positioning block 1104 arranged in the inner tank 1102, a third evaporator 12 arranged at the center of the metal positioning block 1104, a plurality of phase change material storage chambers arranged around the metal positioning block 1104, and a phase change material arranged in the phase change material storage chamber. The outlet pipeline of the second evaporator 3 is connected to the second compressor 5, and the outlet pipeline of the second compressor 5 is connected to the outer shell 1101. The other end of the outer shell 1101 is connected to the second expansion valve 4 by a pipeline, and the outlet of the second expansion valve 4 is connected to the inlet pipeline of the second evaporator 3. One end of the third evaporator 12 is connected to the outlet of the first expansion valve 7 by the first switching valve 6, and the other end is connected to the inlet of the first compressor 9 by the second switching valve 10.

[0019] In this embodiment, a cover 1106 is provided at one end of the phase change material storage cavity of the metal positioning block 1104, and a sealing film 1105 is provided at the other end. A heat preservation cavity is formed between the outer circumference of the inner liner 1102 and the inner circumference of the outer shell 1101, and the number of the supporting ribs 1103 is multiple and multiple water holes 1107 are provided on the supporting ribs 1103.

[0020] Working principle:

[0021] The first working fluid has the characteristics of releasing heat when condensing and liquefying, and absorbing heat when evaporating and gasifying. When the heat source pipe continues to discharge heat source, the first compressor 9 will pressurize the gaseous first working fluid to make it a high-temperature and high-pressure gas, which will be condensed and liquefied through the cooler 8, releasing a large amount of heat to achieve heating. The first expansion valve 7 will decompress the liquid first working fluid, and the liquid first medium will be vaporized and absorb heat through the first evaporator 2, completing a working cycle.

[0022] During this process, the second compressor 5 pressurizes the gaseous second working medium to make it a high-temperature and high-pressure gas, which is condensed and liquefied after passing through the energy storage device 11, releasing a large amount of heat to heat the phase change material and cause it to undergo phase change and store energy. The second expansion valve 4 will decompress the liquid second working medium, and the liquid second medium will then be vaporized by the second evaporator 3 to absorb the waste heat of the heat source pipe, completing another working cycle.

[0023] When the heat source pipe 1 no longer discharges waste heat, the first evaporator 2 no longer works, and the first switching valve 6 and the second switching valve 10 connect the third evaporator 12 with the first expansion valve 7 and the first compressor 9. The medium flowing through the third evaporator 12 absorbs the stored heat of the phase change material in each phase change material storage chamber, and liquefies when condensed by the cooler 8, releasing a large amount of heat to achieve heating.

[0024] The above is a detailed description of the embodiments of the utility model, but the above contents are only preferred embodiments of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of the invention of the utility model should still fall within the scope of this patent.

Claims

1. A heat pump system with energy storage function, comprising a heat source pipe, a first evaporator and a second evaporator arranged in sequence along the length direction of the heat source pipe, a cooler arranged between the outlet pipeline and the inlet pipeline of the first evaporator, a first compressor arranged on the outlet pipeline of the first evaporator, and a first expansion valve arranged on the inlet pipeline of the first evaporator, wherein an energy storage device is connected between the outlet of the first expansion valve and the inlet of the first compressor, and characterized in that: The energy storage device includes an outer shell, an inner tank arranged in the outer shell, a supporting rib plate arranged in the inner tank and the outer shell, a metal positioning block arranged in the inner tank, a third evaporator arranged in the center of the metal positioning block, a plurality of phase change material storage chambers arranged around the metal positioning block, and a phase change material arranged in the phase change material storage chamber. The outlet pipeline of the second evaporator is connected to the second compressor, and the outlet pipeline of the second compressor is connected to the outer shell. The other end of the outer shell is connected to the second expansion valve by a pipeline, and the outlet of the second expansion valve is connected to the inlet pipeline of the second evaporator. One end of the third evaporator is connected to the outlet of the first expansion valve by a first switching valve, and the other end is connected to the inlet of the first compressor by a second switching valve.

2. The heat pump system with energy storage function according to claim 1, characterized in that: A sealing cover is provided at one end of the phase change material storage cavity of the metal positioning block, and a sealing film is provided at the other end.

3. The heat pump system with energy storage function according to claim 1, characterized in that: A heat preservation cavity is formed between the outer circumference of the inner container and the inner circumference of the outer shell, and the number of the supporting ribs is multiple and multiple water holes are arranged on the supporting ribs.

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